Dr Julio Braslavsky

Dr Julio Braslavsky

Conjoint Senior Lecturer

School of Elect Engineering and Computer Science (Electrical and Computer Engineering)

Career Summary

Biography

Julio Braslavsky has been a researcher in dynamic systems and control since 1996. His research expertise includes modelling, analysis and control in applications concerning the integration of renewable energy in electricity grids, and a set of control theory topics including switched control systems, sampled-data control systems, and networked control systems, with a focus on feedback stabilisability and achievable performance.

Braslavsky has made original contributions to the theory of performance limitations in filtering and control systems, on which he has coauthored a well-cited book. His main contributions include the following specific areas:

Networked control systems. Braslavsky and coworkers developed a new framework based on signal-to-noise ratio constrains for the analysis of control systems with feedback over communication channels. In contrast to alternative approaches, the proposed framework provides simpler solutions to a restricted but important class of problems while establishing direct links with well-known analysis and design tools in control systems theory.

Sampled-data control systems. Braslavsky and coworkers have developed a frequency domain lifting approach to sampled-data systems, which was instrumental in capturing intersample information to give the first definitive analysis of robustness and sensitivity tradeoffs in these systems. Another significant contribution in this area was the derivation of a new, rigorous proof of the Poisson sampling formula to discretise an analog system.

Nonlinear control systems. Braslavsky and coworkers developed the optimal cheap control approach to first quantitatively characterise design limitations in nonlinear systems and link them to Bode integrals. Braslavsky and coworker also established conditions under which global or semi-global stabilisation is impossible for a class of cascade systems, and has also collaborated in the robustification of bakstepping design and design tradeoffs in nonminimum phase systems.

Optimal filtering. Braslavsky and coworkers developed a filtering version of the cheap control approach to analyse limiting performance of Kalman filters and draw links between Bode integrals and Wiener filtering problems.

Between 2003 and 2010, as part of his work for the ARC Centre for Complex Dynamic Systems and Control (CDSC) at The University of Newcastle, Braslavsky was project leader and later programme leader of CDSC Industry Programme on Process Control and Optimisation, jointly funded by the ARC, BHP Billiton Innovation and Matrikon.

Since November 2010 Braslavsky is a Senior Scientific Researcher with CSIRO Energy, where he is also Research Team Leader for Energy Systems Modelling, Analysis and Optimisation. Braslavsky continues as a Conjoint Senior Lecturer with the University of Newcastle.

Research Expertise
Braslavsky's most extensive experience is in the field of control systems theory, working in a number of areas including: modelling and control of ensembles of distributed loads in electricity grids, fundamental design limitations in filtering and control design, nonlinear systems, sampled-data control systems, system identification. Braslavsky has collaborated with industry, prominently in recent years in applications in energy technology dealing with modelling and control of distributed energy resources in electricity grids.

Teaching Expertise
Undergraduate courses in control systems analysis and design: internal model control and state space control methods. Graduate courses in optimal and nonlinear control systems. Short course on performance limitations in filtering and control. Lectures on technical writing and professional communication, document typesetting with LaTeX. Modelling and control intensive courses for industry.

Management & Editorial Experience

Research Team Leader for Energy Modelling, Analysis and Optimisation with CSIRO Energy. Associate Editor for the IEEE Trnasactions on Control Systems Technology (2017 to present), Associate editor for IEEE Transactions on Automatic Control (2010-2014), IET Control Theory and Applications (2007-2012), and Associate Editor for the Journal of Latin American Applied Research (2003-2007). Program Leader for Industrial Control and Optimisation for the ARC Centre of Excellence for Complex Dynamic Systems and Control (2008-2010). Regular reviewer for the IEEE Transactions on Smart Grid, IEEE Transactions on Control Systems Technology, Applied Energy, Automatica, the IEEE Transactions on Automatic Control, and System and Control Letters. Grant assessor (Intreader) for the Australian Research Council.

Collaborations
Current research interests and collaborations are in modelling and control of distributed energy resources in electricity networks, analysis of switched control systems, optimal control, and analysis of networked control systems.


Qualifications

  • PhD, University of Newcastle
  • Electronic Engineer Degree - Equivalent Masters, University of Rosario - Argentina

Keywords

  • Electrical Engineering
  • Energy Systems
  • Mathematical Modelling
  • Networked control systems
  • Nonlinear control systems
  • Optimal control
  • Sampled-data control systems
  • System identification
  • Systems and Control Theory

Languages

  • Spanish (Fluent)

Fields of Research

Code Description Percentage
090699 Electrical and Electronic Engineering not elsewhere classified 100

Professional Experience

Academic appointment

Dates Title Organisation / Department
1/01/2010 - 31/12/2011 Conference Chair - Australian Control Conference Australian Control Conference
Australia
1/01/2007 - 31/12/2010 Editorial Board - Institution of Engineering and Technology, Control Theory and Applications (International Journal) Institution of Engineering and Technology, Control Theory and Applications (International Journal)
Australia
1/01/2003 - 31/12/2007 Editorial Board - Latin American Applied Research (International Journal) Latin American Applied Research (International Journal)
United States
1/11/2001 - 1/03/2004 Research Fellow (Investigador Adjunto) National Council for Scientific and Technological Research (CONICET)
Argentina
1/11/2001 - 1/03/2004 Research Fellow National Council of Scientific and Technological Research
Argentina
1/07/1999 - 1/07/2002 Associate Professor National University of Quilmes
Department of Science and Technology
Argentina
1/03/1998 - 1/07/1999 Research Academic University of Newcastle
School of Electrical Engineering and Computing
Australia
1/03/1998 - 1/07/1999 Research Academic University of Newcastle
School of Electrical Engineering and Computing
Australia
1/01/1997 - 1/01/1998 Visiting Researcher The University of California, Santa Barbara
United States
1/09/1996 - 1/12/1996 Postdoctoral Fellow Catholic University of Louvain, Louvain-la-Neuve
Centre for Systems Engineering, Automatics and Applied Mechanics
Belgium
1/10/1995 - 1/08/1996 Research Associate University of Newcastle
School of Electrical Engineering and Computing
Australia

Professional appointment

Dates Title Organisation / Department
1/11/2010 -  Senior Research Scientist Commonwealth Scientific and Industrial Research Organisation (CSIRO)
Energy Technology
1/01/2010 - 31/12/2014 Editorial Board - Institution of Electrical and Electronic Engineers, Transactions on Automatic Control Institution of Electrical and Electronic Engineers, Transactions on Automatic Control
Australia

Invitations

Participant

Year Title / Rationale
1997 Short course:
Organisation: Division of Automatic Control, Department of Electrical Engineering, Linkooping University, Sweden Description: Invitation to give a two-day course based on the Springer-Verlag research monography, then recently published, which Braslavsky coauthored with Seron and Goodwin.
1997 Short course: "Fundamental limitations in filterign and control"
Organisation: Center for Control Engineering and Computation, University of California, Santa Barbara Description: Invitation to give a two-day course based on the Springer-Verlag research monography, then recently published, which Braslavsky coauthored with Seron and Goodwin.
1996 Short course: "Fundamental limitations in filterign and control"
Organisation: Centre for Systems Engineering, Automatics and Applied Mechanics, Catholic University of Louvain Description: Invitation to give a two-day course based on the Springer-Verlag research monography, then recently published, which Braslavsky coauthored with Seron and Goodwin.
1996 Short course:
Organisation: Automatic Control Division, Royal Institute of Technology, Stockholm Description: Invitation to give a two-day course based on the Springer-Verlag research monography, then recently published, which Braslavsky coauthored with Seron and Goodwin.
1996 Short course: "Fundamental limitations in filterign and control"
Organisation: Department of automatic Control, Lund Institute of Technology Description: Invitation to give a two-day course based on the Springer-Verlag research monography, then recently published, which Braslavsky coauthored with Seron and Goodwin.
Edit

Publications

For publications that are currently unpublished or in-press, details are shown in italics.


Book (1 outputs)

Year Citation Altmetrics Link
1997 Seron MM, Braslavsky JH, Goodwin GC, Fundamental Limitations in Filtering and Control, Springer-Verlag (1997) [A1]
Co-authors Maria Seron

Chapter (1 outputs)

Year Citation Altmetrics Link
2015 Stüdli S, Crisostomi E, Middleton R, Braslavsky J, Shorten R, 'Distributed load management using additive increase multiplicative decrease based techniques', Plug In Electric Vehicles in Smart Grids, Springer, Heidelberg 173-202 (2015) [B1]
DOI 10.1007/978-981-287-302-6_7
Citations Scopus - 3
Co-authors Richard Middleton

Journal article (41 outputs)

Year Citation Altmetrics Link
2017 Heidari R, Seron MM, Braslaysky JH, 'Ultimate boundedness and regions of attraction of frequency droop controlled microgrids with secondary control loops', AUTOMATICA, 81 416-428 (2017) [C1]
DOI 10.1016/j.automatica.2016.12.021
Co-authors Maria Seron
2017 Fiorentini M, Wall J, Ma Z, Braslaysky JH, Cooper P, 'Hybrid model predictive control of a residential HVAC system with on-site thermal energy generation and storage', APPLIED ENERGY, 187 465-479 (2017)
DOI 10.1016/j.apenergy.2016.11.041
Citations Scopus - 2Web of Science - 1
2017 Braslavsky JH, Collins LD, Ward JK, 'Voltage stability in a grid-connected inverter with automatic Volt-Watt and Volt-VAR functions', IEEE Transactions on Smart Grid, (2017)

IEEE The growing uptake of solar power in low-voltage grids across the world has drawn attention to potential overvoltage issues. In an effort to mitigate overvoltage, automatic V... [more]

IEEE The growing uptake of solar power in low-voltage grids across the world has drawn attention to potential overvoltage issues. In an effort to mitigate overvoltage, automatic Volt-Watt and Volt-VAR inverter response functions have been introduced in recent standards. The utility of these functions has been established in a number of recent studies. However, relatively little analysis exists on the stability of grid-connected inverters where decentralised operation of these response functions can potentially trigger undesirable interactions. This paper presents a rigorous stability analysis of a grid-connected inverter under simultaneous operation of automatic Volt-Watt and Volt-VAR response functions. Conditions for the existence of an equilibrium voltage are established together with tests that characterise its stability in terms of the inverter and line parameters. The analysis reveals a little-known stability vulnerability arising when both Volt-Watt and Volt-VAR functions are in operation if Watt output takes precedence over the provision of VAR support, a generally recommended setting. To circumvent this vulnerability, the proposed stability tests allow parameter selection for guaranteed stability margins. A safe configuration alternative is also identified to avoid instability at the expense of real power output. Numerical methods to compute equilibrium voltages are presented and used in two illustrative numerical studies.

DOI 10.1109/TSG.2017.2732000
2017 Mahdavi N, Braslavsky JH, Seron MM, West SR, 'Model predictive control of distributed air-conditioning loads to compensate fluctuations in solar power', IEEE Transactions on Smart Grid, (2017)

IEEE Flexible loads such as residential air-conditioners (ACs) can be directly controlled to provide demand-side regulation and balance services in electricity grids. Large aggreg... [more]

IEEE Flexible loads such as residential air-conditioners (ACs) can be directly controlled to provide demand-side regulation and balance services in electricity grids. Large aggregations of ACs offer a resource akin to that of a distributed energy storage system, which may be used to compensate fluctuations in the power output of local renewable energy generation. This paper formulates distributed and centralised model predictive control (MPC) strategies to balance fluctuations in solar power generation by directly controlling the aggregate demand of clusters of distributed residential ACs. The proposed receding-horizon control strategies rely on a new second-order linear time-varying model for the aggregate demand response of a population of heterogeneous ACs to changes in thermostat setpoints under varying ambient temperature. The performance of the proposed MPC strategies is analysed in a numerical simulation study implementing AC demand tracking of 1-minute fluctuations in actual PV capacity based on persistence and sky imager short-term solar forecasts. The results show that distributed and centralised MPC strategies achieve comparable performance, with better performance of persistence forecasts in a shorter prediction horizon, and better performance with sky imager forecasts on a longer prediction horizon.

DOI 10.1109/TSG.2017.2717447
Co-authors Maria Seron
2016 Heidari R, Braslaysky JH, Seron MM, Haimovich H, 'Ultimate bound minimisation by state feedback in discrete-time switched linear systems under arbitrary switching', NONLINEAR ANALYSIS-HYBRID SYSTEMS, 21 84-102 (2016) [C1]
DOI 10.1016/j.nahs.2016.02.001
Citations Scopus - 1Web of Science - 1
Co-authors Maria Seron
2015 Braslavsky JH, Wall JR, Reedman LJ, 'Optimal distributed energy resources and the cost of reduced greenhouse gas emissions in a large retail shopping centre', APPLIED ENERGY, 155 120-130 (2015) [C1]
DOI 10.1016/j.apenergy.2015.05.085
Citations Scopus - 10Web of Science - 7
2015 Heidari R, Seron MM, Braslavsky JH, 'Eigenstructure assignment for componentwise ultimate bound minimisation in discrete-time linear systems', IEEE Transactions on Automatic Control, PP (2015)

© 2015 IEEE. This paper presents a feedback design approach to minimise state ultimate-bounds (UBs) in linear time-invariant discrete-time systems subject to non-vanishing bounde... [more]

© 2015 IEEE. This paper presents a feedback design approach to minimise state ultimate-bounds (UBs) in linear time-invariant discrete-time systems subject to non-vanishing bounded disturbances. A target closed-loop eigenstructure is first constructed to achieve the lowest possible UBs for one or more state components of the system. Structural conditions on the system matrices are then derived to guarantee that the target eigenstructure can be assigned by state feedback. When the required structural conditions are satisfied, an eigenvector assignment procedure can be applied to simultaneously minimise multiple UBs in systems with multiple inputs. The results are illustrated by a numerical example drawn from a distributed voltage control problem in inverter-based microgrids.

DOI 10.1109/TAC.2015.2513367
Co-authors Maria Seron
2014 Perfumo C, Braslavsky JH, Ward JK, 'Design and application of a model-based PID controller for aggregations of thermostatically controlled loads', International Journal of Power and Energy Systems, 34 125-135 (2014)

Populations of distributed thermostatically controlled loads (TCLs) can be remotely controlled as a demand-side approach to maintain the generation-consumption balance in the elec... [more]

Populations of distributed thermostatically controlled loads (TCLs) can be remotely controlled as a demand-side approach to maintain the generation-consumption balance in the electricity grid. Adjusting load to generation can result in reduced emissions and lower network operating costs than adjusting generation to load (its traditional counterpart). TCLs have been the focus of a number of recent studies proposing model-based feedback load control (LC) strategies, with promising results. However, commonly made assumptions limit the practicality of such strategies in LC scenarios involving small populations of TCLs, or where the requirement of power demand readings of the controlled devices for feedback may be prohibitively expensive. This paper exploits a parametric second-order TCL model previously developed by the authors to design a proportionalintegral- derivative (PID) controller readily implementable in such LC scenarios. The proposed PID controller, based on the broadcast of setpoint offset changes, only requires feedback of aggregate demand readings at the distribution feeder level. LC performance is evaluated on a numerical case study that embeds simulated TCLs in real power and temperature data from a 70-house residential precinct. The case study highlights the potential of the proposed model-based approach in practical LC scenarios.

DOI 10.2316/Journal.203.2014.3.203-0082
2014 Perfumo C, Braslavsky JH, Ward JK, 'Model-Based Estimation of Energy Savings in Load Control Events for Thermostatically Controlled Loads', IEEE TRANSACTIONS ON SMART GRID, 5 1410-1420 (2014) [C1]
DOI 10.1109/TSG.2014.2298840
Citations Scopus - 13Web of Science - 14
2013 Haimovich H, Braslavsky JH, 'Sufficient Conditions for Generic Feedback Stabilizability of Switching Systems via Lie-Algebraic Solvability', IEEE Transactions on Automatic Control, 58 814-820 (2013) [C1]
DOI 10.1109/TAC.2012.2218151
Citations Scopus - 8Web of Science - 8
2012 Perfumo CN, Kofman E, Braslavsky JH, Ward JK, 'Load management: Model-based control of aggregate power for populations of thermostatically controlled loads', Energy Conversion and Management, 55 36-48 (2012) [C1]
Citations Scopus - 98Web of Science - 85
2011 Haimovich H, Osella EN, Braslavsky JH, 'On Lie-algebraic-solvability-based feedback stabilization of systems with controller-driven sampling', IFAC Proceedings Volumes (IFAC-PapersOnline), 18 8731-8736 (2011)

We address state-feedback stabilization of discrete-time switched systems (DTSSs) that describe a continuous-time linear time-invariant (LTI) system sampled at varying rates. We c... [more]

We address state-feedback stabilization of discrete-time switched systems (DTSSs) that describe a continuous-time linear time-invariant (LTI) system sampled at varying rates. We consider a setting in which the controller, in addition to applying feedback, selects and varies the sampling rate. We refer to this situation as controller-driven sampling. Our feedback control design approach relies on Lie-algebraic stability results that involve the solvability of the Lie algebra generated by the DTSS's subsystem closed-loop evolution matrices. In matrix terms, Lie-algebraic solvability is equivalent to the simultaneous triangularization of the generating matrices by means of a single similarity transformation. The present paper continues previous work based on the fact that even if the corresponding Lie algebra may be not solvable, closedloop stability can still be achieved by "approximate" triangularization. A rst contribution of the present paper is to show that the Lie-algebraic stabilization problem arising for the class of DTSSs considered can be much less restrictive than for DTSSs of arbitrary form. A second contribution is the identification of a potential pitfall in the application of the approximate triangularization strategy to the class of DTSSs considered, and a suggestion to avoid it. © 2011 IFAC.

DOI 10.3182/20110828-6-IT-1002.02576
Citations Scopus - 3
2011 Haimovich H, Braslavsky JH, Felicioni FE, 'Feedback Stabilization of Switching Discrete-Time Systems via Lie-Algebraic Techniques', IEEE TRANSACTIONS ON AUTOMATIC CONTROL, 56 1129-1135 (2011) [C1]
DOI 10.1109/TAC.2011.2106252
Citations Scopus - 12Web of Science - 9
2011 Freudenberg JS, Middleton RH, Braslavsky JH, 'Minimum variance control over a Gaussian communication channel', IEEE Transactions on Automatic Control, 56 1751-1765 (2011) [C1]
DOI 10.1109/TAC.2010.2097831
Citations Scopus - 35Web of Science - 30
Co-authors Richard Middleton
2010 Middleton RH, Braslavsky JH, 'String Instability in Classes of Linear Time Invariant Formation control with Limited Communication Range', IEEE Transactions on Automatic Control, 55 1517-1518 (2010)
DOI 10.1109/TAC.2010.2052314
Citations Scopus - 3
Co-authors Richard Middleton
2010 Middleton RH, Braslavsky JH, 'String instability in classes of linear time invariant formation control with limited communication range', IEEE Transactions on Automatic Control, 55 1519-1530 (2010) [C1]
DOI 10.1109/TAC.2010.2042318
Citations Scopus - 99Web of Science - 89
Co-authors Richard Middleton
2010 Perfumo C, Ward JK, Braslavsky JH, 'Reducing energy use and operational cost of air conditioning systems with multi-objective evolutionary algorithms', 2010 IEEE CONGRESS ON EVOLUTIONARY COMPUTATION (CEC), (2010)
Citations Scopus - 3
2009 Lau K, Braslavsky JH, Aguero JC, Goodwin GC, 'An errors-in-variables method for non-stationary data with application to mineral exploration', Automatica, 45 2971-2976 (2009) [C1]
DOI 10.1016/j.automatica.2009.10.009
Citations Scopus - 4Web of Science - 2
Co-authors Graham Goodwin, Juan Aguero
2009 Middleton RH, Rojas AJ, Freudenberg JS, Braslavsky JH, 'Feedback stabilization over a first order moving average Gaussian noise channel', IEEE Transactions on Automatic Control, 54 163-167 (2009) [C1]
DOI 10.1109/tac.2008.2007183
Citations Scopus - 28Web of Science - 22
Co-authors Richard Middleton
2009 Braslavsky JH, Middleton RH, Freudenberg JS, 'Authors' reply', IEEE Transactions on Automatic Control, 54 1427 (2009) [C3]
DOI 10.1109/tac.2009.2020635
Co-authors Richard Middleton
2008 Rojas AJ, Braslavsky JH, Middleton RH, 'Channel signal-to-noise ratio constrained feedback control: performance and robustness', IET Control Theory and Applications, 2 595-605 (2008) [C1]
DOI 10.1049/iet-cta:20070246
Citations Scopus - 23Web of Science - 17
Co-authors Richard Middleton
2008 Rojas AJ, Braslavsky JH, Middleton RH, 'Fundamental limitations in control over a communication channel', Automatica, 44 3147-3151 (2008) [C1]
DOI 10.1016/j.automatica.2008.05.014
Citations Scopus - 66Web of Science - 46
Co-authors Richard Middleton
2007 Romero M, Braslavsky JH, Valla MI, 'Ripple reduction in direct torque and flux control of induction motors via sliding modes', Latin American Applied Research, 37 289-297 (2007) [C1]
Citations Scopus - 3Web of Science - 2
2007 Braslavsky JH, Middleton RH, Freudenberg JS, 'Feedback stabilization over signal-to-noise ratio constrained channels', IEEE Transactions on Automatic Control, 52 1391-1403 (2007) [C1]
DOI 10.1109/tac.2007.902739
Citations Scopus - 261Web of Science - 218
Co-authors Richard Middleton
2005 Braslavsky JH, Middleton RH, Freudenberg JS, 'Effects of time delay on feedback stabilisation over signal-to-noise ratio constrained channels', IFAC Proceedings Volumes (IFAC-PapersOnline), 16 219-224 (2005)

The expanding integration of control and communication networks in recent years has generated an increasing interest in control problems with feedback over a communication channel... [more]

The expanding integration of control and communication networks in recent years has generated an increasing interest in control problems with feedback over a communication channel. Significant research activity has concentrated on stabilisation in face of channel effects such as quantisation and data-rate limits. in a recent paper, the authors have studied the problem of feedback stabilisation over a communication channel with a constraint on the admissible signal-to-noise ratio (SNR). It has been shown therein that for a delay-free, linear time-invariant feedback loop, a SNR constraint in the feedback channel imposes fundamental limitations in the ability to achieve closed-loop stability. The present paper extends these results by introducing a time-delay in the loop, and shows that the lowest SNR required for closed-loop stability increases by a factor that may grow exponentially with the time-delay and the unstable open loop poles of the system. This result contributes to the quantification of performance trade offs in integrated control and communication environments. Copyright © 2005 IFAC.

Citations Scopus - 16
Co-authors Richard Middleton
2004 Middleton R, Braslavsky JH, Freudenberg J, 'Stabilization of non-minimum phase plants over signal-to-noise ratio constrained channels', 2004 5th Asian Control Conference, 3 1914-1922 (2004)

We recently considered feedback stabilization over a Signal to Noise Ratio (SNR) constrained channel. The results were examined for the state feedback and minimum phase cases, wit... [more]

We recently considered feedback stabilization over a Signal to Noise Ratio (SNR) constrained channel. The results were examined for the state feedback and minimum phase cases, with links to bit-rate limited control. In this paper, we extend this analysis to Non-Minimum Phase (NMP) plants, and show that for Linear Time Invariant (LTI) control, NMP zeros further constrain the ability to stabilize over an SNR limited channel. This differs from the situation of bit-rate limited stabilization where NMP zeros do not play a role. We show that by considering linear time varying feedback the effect of NMP zeros in SNR limited stabilization may be eliminated.

Citations Scopus - 13
Co-authors Richard Middleton
2003 Lau K, Middleton RH, Braslavsky JH, 'Undershoot and Settling Time Tradeoffs for Nonminimum Phase Systems', IEEE Transactions on Automatic Control, 48 1389-1393 (2003) [C1]
DOI 10.1109/TAC.2003.815025
Citations Scopus - 28Web of Science - 18
Co-authors Richard Middleton
2002 Goodwin GC, Braslavsky JH, Seron MM, 'Non-stationary stochastic embedding for transfer function estimation', Automatica, 38 47-62 (2002) [C1]
Citations Scopus - 27Web of Science - 19
Co-authors Graham Goodwin, Maria Seron
2000 Arcak M, Seron M, Braslavsky J, Kokotovic P, 'Robustification of backstepping against input unmodeled dynamics', IEEE TRANSACTIONS ON AUTOMATIC CONTROL, 45 1358-1363 (2000) [C1]
DOI 10.1109/9.867048
Citations Scopus - 26Web of Science - 18
Co-authors Maria Seron
1999 Braslavsky JH, Seron MM, Mayne DQ, Kokotovic PV, 'Limiting performance of optimal linear filters', AUTOMATICA, 35 189-199 (1999) [C1]
DOI 10.1016/S0005-1098(98)00144-7
Citations Scopus - 34Web of Science - 31
Co-authors Maria Seron
1999 Seron MM, Braslavsky JH, Kokotovic PV, Mayne DQ, 'Feedback limitations in nonlinear systems: From bode integrals to cheap control', IEEE TRANSACTIONS ON AUTOMATIC CONTROL, 44 829-833 (1999) [C1]
DOI 10.1109/9.754828
Citations Scopus - 114Web of Science - 101
Co-authors Maria Seron
1999 Braslavsky JH, Middleton RH, Freudenberg JS, 'Cheap control performance of a class of non-right-invertible nonlinear systems', Proceedings of the IEEE Conference on Decision and Control, 5 4718-4723 (1999)

For strict-feedback nonlinear systems, this paper shows that it is impossible to reduce to zero the optimal cost in the regulation of more states than the number of control inputs... [more]

For strict-feedback nonlinear systems, this paper shows that it is impossible to reduce to zero the optimal cost in the regulation of more states than the number of control inputs in the system, even using unrestricted control effort. By constructing a near optimal cheap control law, we characterise the infirm value of the optimal regulation cost as the optimal value of a reduced-order regulator problem where the states with lower relative degree drive those with higher relative degree. We illustrate our results with two examples of practical interest: the optimal regulation of the rotational motion of a free rigid body, and the optimal control of a magnetic suspension system.

Citations Scopus - 3
Co-authors Richard Middleton
1998 Braslavsky JH, Middleton RH, Freudenberg JS, 'L

This paper develops exact, computable formulas for the frequency gain and L 2 -induced norm of the sensitivity operator in a sampled-data control system. With sampled data, we ref... [more]

This paper develops exact, computable formulas for the frequency gain and L 2 -induced norm of the sensitivity operator in a sampled-data control system. With sampled data, we refer to a system that combines both continuous-time and discrete-time signals, which is studied in continuous time. The expressions are obtained using lifting techniques in the frequency domain and have application in performance and stability robustness analysis taking into account full intersample information.

DOI 10.1109/9.661076
Citations Scopus - 15
Co-authors Richard Middleton
1998 Braslavsky JH, Middleton RH, Freudenberg JS, 'L2-Induced Norms and Frequency Gains of Sampled-Data Sensitivity Operators', IEEE Transactions on Automatic Control, 43 252-258 (1998) [C1]
Citations Web of Science - 12
Co-authors Richard Middleton
1997 Freudenberg JS, Middleton RH, Braslavsky JH, 'Robustness of zero shifting via generalized sampled-data hold functions', IEEE Transactions on Automatic Control, 42 1681-1692 (1997) [C1]
Citations Scopus - 21Web of Science - 18
Co-authors Richard Middleton
1997 Braslavsky JH, Meinsma G, Middleton RH, Freudenberg JS, 'On a key sampling formula relating the Laplace and Z transforms', Systems & Control Letters, 29 181-190 (1997) [C1]
Citations Scopus - 10Web of Science - 9
Co-authors Richard Middleton
1996 Braslavsky JH, Middleton RH, 'Global and semi-global stabilizability in certain cascade nonlinear systems', IEEE Transactions on Automatic Control, 41 876-881 (1996) [C1]
Citations Scopus - 16Web of Science - 18
Co-authors Richard Middleton
1995 BRASLAVSKY JH, MIDDLETON RH, FREUDENBERG JS, 'Sensitivity and robustness of sampled-data control systems: A frequency domain viewpoint.', PROCEEDINGS OF THE 1995 AMERICAN CONTROL CONFERENCE, VOLS 1-6, 1040-1044 (1995)
Citations Scopus - 3Web of Science - 2
Co-authors Richard Middleton
1995 FREUDENBERG JS, MIDDLETON RH, BRASLAVSKY JH, 'INHERENT DESIGN LIMITATIONS FOR LINEAR SAMPLED-DATA FEEDBACK-SYSTEMS', INTERNATIONAL JOURNAL OF CONTROL, 61 1387-1421 (1995)
DOI 10.1080/00207179508921961
Citations Scopus - 38Web of Science - 39
Co-authors Richard Middleton
1994 BRASLAVSKY JH, MIDDLETON RH, 'GLOBAL AND SEMIGLOBAL STABILIZABILITY IN CERTAIN CASCADE NONLINEAR-SYSTEMS', PROCEEDINGS OF THE 1994 AMERICAN CONTROL CONFERENCE, VOLS 1-3, 1761-1765 (1994)
Citations Scopus - 1Web of Science - 1
Co-authors Richard Middleton
1994 FREUDENBERG JS, MIDDLETON RH, BRASLAVSKY JH, 'INHERENT DESIGN LIMITATIONS FOR LINEAR SAMPLED-DATA FEEDBACK-SYSTEMS', PROCEEDINGS OF THE 1994 AMERICAN CONTROL CONFERENCE, VOLS 1-3, 3227-3231 (1994)
Citations Scopus - 3Web of Science - 2
Co-authors Richard Middleton
Show 38 more journal articles

Conference (65 outputs)

Year Citation Altmetrics Link
2016 Li J, Braslavsky JH, 'Optimal sizing of photovoltaic and battery for residential house using genetic algorithms', Advances in Power and Energy Engineering - Proceedings of the 8th Asia-Pacific Power and Energy Engineering Conference, APPEEC 2016 (2016)

© 2016 Taylor & Francis Group, London. A genetic algorithm based optimization methodology for solar PV generation and battery storage systems is presented. The purpose of t... [more]

© 2016 Taylor & Francis Group, London. A genetic algorithm based optimization methodology for solar PV generation and battery storage systems is presented. The purpose of the proposed methodology is to minimise the annual energy cost for a household by optimally sizing and operating the battery and PV system. Genetic algorithm optimises the battery size together with the corresponding charge and discharge cycles under a time-of-use electricity tariff. Three optimisation scenarios are considered: optimization of battery size for households with and without pre-existing PV generation, and optimisation of both battery and PV size simultaneously for a household without PV generation. For each scenario, the optimization is performed using realistic battery models for a commercial deep-cycle lead-acid battery system. The results show that optimal battery capacities and PV size can significantly save energy cost for the householder. However, it varies strongly with the electricity consumption profile of the household, and is also affected by electricity and battery prices.

2016 Mahdavi N, Braslavsky JH, Seron MM, 'Model predictive control of distributed air-conditioning loads for mitigation of solar variability', 2016 Australian Control Conference, AuCC 2016 (2016) [E1]
DOI 10.1109/AUCC.2016.7868181
Co-authors Maria Seron
2015 Heidari R, Seron MM, Braslavsky JH, 'Ultimate bounds and regions of attraction for two-inverter microgrids with primary and secondary frequency control loops', Proceedings of the IEEE Conference on Decision and Control (2015) [E1]

© 2015 IEEE. In this paper we study frequency stabilisation in inverter-based microgrid systems with primary droop controller and three types of secondary control strategies. Par... [more]

© 2015 IEEE. In this paper we study frequency stabilisation in inverter-based microgrid systems with primary droop controller and three types of secondary control strategies. Particularising the microgrid to the case of two inverter buses, we propose structured models for which frequency regulation, ultimate bounds and an estimate of the region of attraction associated with the ultimate bound set are obtained in closed-form analytical expressions.

DOI 10.1109/CDC.2015.7403036
Citations Scopus - 1Web of Science - 1
Co-authors Maria Seron
2015 Braslavsky JH, Ward JK, Collins L, IEEE, 'A stability vulnerability in the interaction between Volt-VAR and Volt-Watt response functions for smart inverters', 2015 IEEE CONFERENCE ON CONTROL AND APPLICATIONS (CCA 2015) (2015) [E1]
Citations Scopus - 2Web of Science - 1
2015 Stüdli S, Middleton RH, Braslavsky JH, Shorten R, 'AIMD in a discrete time implementation or with a non-constant shared resource', 2015 Australian Control Conference, AUCC 2015 (2015) [E1]

© 2015 Engineers Australia. The additive increase multiplicative decrease (AIMD) algorithm, that is commonly used for congestion avoidance in communication networks, has recently... [more]

© 2015 Engineers Australia. The additive increase multiplicative decrease (AIMD) algorithm, that is commonly used for congestion avoidance in communication networks, has recently been suggested in other fields such as load management in electric power networks. As for congestion avoidance, in such systems a large number of agents are required to share a given resource. In recent work by Shorten, Wirth and Leith on congestion control in networking a stochastic model has been developed to analyse AIMD algorithms. However, the analysis assumes a continuous implementation of the algorithm and a constant available resource. These assumptions are no longer useful if the AIMD algorithm is applied in fields such as load management in electric power networks, where a discrete implementation is often required, and the available resource shared may be inherently variable. In this paper we develop a disturbed AIMD model based on the model introduced by Shorten et al. that includes discrete time implementation and time varying resource availability. Further, we use that model to bound the influence of these disturbances, caused by either a discrete implementation or small variations in the available resource.

Co-authors Richard Middleton
2015 Heidari R, Seron MM, Braslavsky JH, 'Regions of attraction to ultimate bound sets for inverter-based microgrids with decentralised frequency control loops', 2015 Australian Control Conference, AUCC 2015 (2015) [E1]

© 2015 Engineers Australia. In this paper we study frequency stabilisation in inverter-based microgrid systems with primary droop controller and decentralised secondary control s... [more]

© 2015 Engineers Australia. In this paper we study frequency stabilisation in inverter-based microgrid systems with primary droop controller and decentralised secondary control strategy. For the microgrid with any configuration of inverter buses, we establish conditions for trajectory ultimate boundedness and derive an explicit description of an estimate of the region of attraction to the ultimate bound set.

Citations Scopus - 2Web of Science - 1
Co-authors Maria Seron
2015 von Appen J, Braslavsky JH, Ward JK, Braun M, 'Sizing and grid impact of PV battery systems - a comparative analysis for Australia and Germany', 2015 International Symposium on Smart Electric Distribution Systems and Technologies (EDST) (2015)
Citations Scopus - 6Web of Science - 2
2015 Mahdavi N, Braslavsky JH, Perfumo C, 'Modelling the aggregate demand response of a population of air conditioners to changes in ambient temperature', Proceedings of the 2015 54th IEEE Conference on Decision and Control (2015) [E1]
DOI 10.1109/CDC.2015.7402707
2014 Heidari R, Seron MM, Braslavsky JH, Haimovich H, 'On Componentwise Ultimate Bound Minimisation for Switched Linear Systems Via Closed-Loop Lie-Algebraic Solvability', Proceedings of the 19th IFAC World Congress, 2014 (2014) [E1]
DOI 10.3182/20140824-6-ZA-1003.02663
Citations Scopus - 1
Co-authors Maria Seron
2014 Mahdavi N, Perfumo C, Braslavsky JH, 'Bayesian parameter estimation for direct load control of populations of air conditioners', IFAC Proceedings Volumes (IFAC-PapersOnline) (2014) [E1]

© IFAC. Recent approaches for direct load control (DLC) of populations of air conditioners (ACs) to provide demand-side services in the electricity grid rely on mathematical mode... [more]

© IFAC. Recent approaches for direct load control (DLC) of populations of air conditioners (ACs) to provide demand-side services in the electricity grid rely on mathematical models of the aggregate demand dynamics of these populations. These models can be parametrised by the physical characteristics of the ACs in the population, for example their thermal power. The knowledge of how their physical parameters are distributed in the population of real devices is instrumental in the analysis and implementation of controllers based on such models. For large populations, it is typically assumed that these parameters are stochastically distributed according to some probability distribution, e.g., log-normal, which has been effective in simulations. However, the identification of such distribution for a specific population remains an open problem for real-world deployments of DLC. This paper formulates a Bayesian framework for the state and parameter estimation of a previously developed input/output model for the aggregate demand response of heterogeneous populations of ACs. This framework enables us to assign a prior distribution to the parameters of the model, which is then updated using measurements of power demand data for the population to reach a posterior distribution that is more informative about the true value of these parameters. The framework uses sequential Monte Carlo methods, which are well-suited to existing high-performance computer hardware, and aims to provide a way to fill a gap between simulation and real implementation by validating posterior parameter distributions using real measurements. Simulation results indicate that our approach can successfully capture the values defining the distributions of physical parameters in a population simulated by 10,000 ACs with a standard hybrid dynamic model for each device.

Citations Scopus - 1
2014 Mahdavi N, Perfumo C, Braslavsky JH, 'Towards load control of populations of air conditioners with guaranteed comfort margins', IFAC Proceedings Volumes (IFAC-PapersOnline) (2014) [E1]

© IFAC. The increasing penetration of renewable sources in electricity grids has motivated interest in controlling loads to compensate for variability of these generation sources... [more]

© IFAC. The increasing penetration of renewable sources in electricity grids has motivated interest in controlling loads to compensate for variability of these generation sources. Air conditioners (ACs) are one type of loads that can be effectively controlled by broadcasting temperature setpoint offsets and using measurements of aggregate power demand for feedback, as shown in recent works. While such control approach can arbitrarily shape demand, it does so at the expense of end-use comfort, which may be a deterrent to participation in such programmes. This paper explores the use of an alternative to setpoint offsets to shape aggregate demand of ACs without violating end-use comfort levels. The proposed control consists in manipulating the width of the ACs' temperature regulation bands by raising the low temperature limit (or lowering the high temperature limit) to change aggregate demand while keeping AC temperatures within the specified ranges. We develop a deterministic mathematical model for the AC aggregate demand response to changes in the new proposed control input, and numerically validate it against a simulated population of ACs. The resulting model is amenable to systematic analysis and design for direct load control with guaranteed comfort margins. We illustrate this point by deriving a theoretical upper bound on the maximum energy that may be released from a given population of ACs controlled using the proposed control input.

Citations Scopus - 1
2014 Heidari R, Seron MM, Braslavsky JH, 'Ultimate Boundedness of Droop Controlled Microgrids with Secondary Loops', 2014 4TH AUSTRALIAN CONTROL CONFERENCE (AUCC) (2014)
Citations Scopus - 3Web of Science - 1
Co-authors Maria Seron
2013 Braslavsky JH, Perfumo C, Ward JK, 'Model-based feedback control of distributed air-conditioning loads for fast demand-side ancillary services', 2013 IEEE 52ND ANNUAL CONFERENCE ON DECISION AND CONTROL (CDC) (2013)
2013 Heidari R, Seron MM, Braslavsky JH, 'On Eigenvalue-Eigenvector Assignment for Componentwise Ultimate Bound Minimisation in MIMO LTI Discrete-Time Systems', 2013 3rd Australian Control Conference (AUCC) (2013) [E1]
DOI 10.1109/AUCC.2013.6697312
Citations Scopus - 4Web of Science - 1
Co-authors Maria Seron
2013 Stuedli S, Middleton RH, Braslavsky JH, 'A fixed-structure automaton for load management of electric vehicles', 2013 European Control Conference, ECC 2013 (2013) [E1]
Citations Scopus - 2Web of Science - 2
Co-authors Richard Middleton
2013 Heidari R, Seron MM, Braslavsky JH, Haimovich H, 'Eigenvalue assignment for componentwise ultimate bound minimisation in LTI discrete-time systems', 2013 European Control Conference, ECC 2013 (2013) [E1]
Citations Scopus - 3
Co-authors Maria Seron
2013 Braslavsky JH, Perfumo C, Ward JK, 'Model-based feedback control of distributed air-conditioning loads for fast demand-side ancillary services', 2013 IEEE 52ND ANNUAL CONFERENCE ON DECISION AND CONTROL (CDC) (2013) [E1]
Citations Scopus - 17
2013 Liu M, Stuedli S, Middleton R, McLoone S, Shorten R, Braslavsky J, 'On-Off based Charging Strategies for EVs Connected to a Low Voltage Distributon Network', 2013 IEEE PES ASIA-PACIFIC POWER AND ENERGY ENGINEERING CONFERENCE (APPEEC) (2013)
Citations Scopus - 1
Co-authors Richard Middleton
2013 Perfumo C, Braslavsky J, Ward JK, Kofman E, 'An analytical characterisation of cold-load pickup oscillations in thermostatically controlled loads', 2013 3RD AUSTRALIAN CONTROL CONFERENCE (AUCC) (2013)
Citations Scopus - 4Web of Science - 2
2013 Perfumo C, Braslavsky J, Ward JK, 'A sensitivity analysis of the dynamics of a population of thermostatically-controlled loads', 2013 Australasian Universities Power Engineering Conference, AUPEC 2013 (2013)

Load control of populations of thermostatically-controlled loads (TCLs) is considered a promising approach to match generation and consumption in electricity grids from the demand... [more]

Load control of populations of thermostatically-controlled loads (TCLs) is considered a promising approach to match generation and consumption in electricity grids from the demand side. However, when these loads become synchronised they present a decaying oscillatory aggregate demand, which results in undesired power peaks. In this paper we describe the nature of these oscillations and develop a list of factors that determine its shape. We perform a sensitivity analysis which allows us to identify important relations between the physical parameters of the TCLs and their aggregate dynamics. Beyond describing fundamental behaviour, these relations can help develop and validate analytical expressions that facilitate control design, enabling the use of TCLs for demand response. © 2013 Australasian Committee for Power Engineering (ACPE).

Citations Scopus - 3
2011 Perfumo CN, Kofman E, Braslavsky JH, Ward JK, 'Model-based control on populations of air conditioners: Shaping aggregated power for demand side management', Proceedings of the 2011 Australian Control Conference, AUCC 2011 (2011) [E1]
Citations Scopus - 1
2011 Haimovich H, Braslavsky JH, 'Conditions for the genericity of feedback stabilisability of discrete-time switching systems based on Lie-algebraic solvability', Proceedings of the 2011 Australian Control Conference, AUCC 2011 (2011)

This paper addresses the stabilisation of switching discrete-time linear systems with control inputs under arbitrary switching, based on the existence of a common quadratic Lyapun... [more]

This paper addresses the stabilisation of switching discrete-time linear systems with control inputs under arbitrary switching, based on the existence of a common quadratic Lyapunov function (CQLF). While stabilising feedback gains may be directly designed by solving linear matrix inequalities (LMIs), LMI-based designs in general do not provide information about closed-loop system structure. The authors have begun a line of work dealing with control design based on the Lie-algebraic solvability property. In contrast to LMI-based design, although at the expense of generality, control design based on such Lie-algebraic property seeks to assign closed-loop structure approximating that required to satisfy Lie algebraic conditions that guarantee existence of a CQLF. The present paper expands on earlier work by deriving conditions under which the closed-loop system can be caused to satisfy the Lie-algebraic solvability property generically, i.e. for almost every set of system parameters, furthermore admitting straightforward and efficient numerical implementation. © 2011 ENGINEERS AUSTRALIA & AUSTRALIAN OPTICAL.

Citations Scopus - 2
2010 Perfumo CN, Ward JK, Braslavsky JH, 'Achieving a synergy by combining air conditioners and photovoltaic panels: An evolutionary-algorithm approach', 20th Australasian Universities Power Engineering Conference: (2010) [E1]
Citations Scopus - 1
2010 Haimovich H, Braslavsky JH, 'Feedback stabilisation of switched systems via iterative approximate eigenvector assignment', Proceedings of the 49th IEEE Conference on Decision and Control (2010) [E1]
Citations Scopus - 11Web of Science - 6
2009 Haimovich H, Braslavsky JH, Felicioni F, 'On feedback stabilisation of switched discrete-time systems via lie-algebraic techniques', Proceedings of the 48th IEEE Conference on Decision and Control, 2009 held jointly with the 2009 28th Chinese Control Conference, CDC/CCC 2009 (2009) [E1]
DOI 10.1109/cdc.2009.5399527
Citations Scopus - 10Web of Science - 4
2009 Ugryumova D, Lau K, Braslavsky JH, Meinsma G, 'An application of system identification techniques to impedance estimation in magnetotelluric surveying', Proceedings of the 15th IFAC Symposium on System Identification (2009) [E1]
DOI 10.3182/20090706-3-fr-2004.0268
2008 Godoy BI, Braslavsky JH, Aguero JC, 'A simulation study on model predictive control and extremum seeking control for heap bioleaching processes', Proceedings of the 17th World Congress of the International Federation of Automatic Control (2008) [E1]
DOI 10.3182/20080706-5-kr-1001.2024
Citations Scopus - 4
Co-authors Juan Aguero
2008 Lau K, Braslavsky JH, Aguero JC, Goodwin GC, 'Application of non-stationary EIV methods to transient electromagnetic mineral exploration', Proceedings of the 17th World Congress of the International Federation of Automatic Control (2008) [E1]
DOI 10.3182/20080706-5-kr-1001.1488
Citations Scopus - 3
Co-authors Juan Aguero, Graham Goodwin
2008 Rojas AJ, Middleton RH, Freudenberg JS, Braslavsky JH, 'Input disturbance rejection in channel signal-to-noise ratio constrained feedback control', Proceedings of the American Control Conference 2008 (2008) [E1]
DOI 10.1109/acc.2008.4586969
Citations Scopus - 12Web of Science - 2
Co-authors Richard Middleton
2008 Freudenberg JS, Middleton RH, Braslavsky JH, 'Minimum variance control over a Gaussian communication channel', Proceedings of the American Control Conference 2008 (2008) [E1]
DOI 10.1109/acc.2008.4586888
Citations Scopus - 15Web of Science - 6
Co-authors Richard Middleton
2007 Godoy BI, Braslavsky JH, Mahata K, 'Low Complexity Modelling and Parameter Estimation in Copper Bioleaching Processes', Preprints of the 14th IFAC Symposium on System Identification (2007) [E1]
Co-authors Kaushik Mahata
2007 Braslavsky JH, Rojas AJ, Middleton RH, 'Feedback control over signal to noise ratio constrained communication channels', CT07 Abstracts (2007) [E3]
Co-authors Richard Middleton
2007 Rojas AJ, Braslavsky JH, Middleton RH, 'Output feedback sensitivity functions under signal to noise ratio constraint', Proceedings of the 2007 American Control Conference ACC '07 (2007) [E1]
DOI 10.1109/acc.2007.4282601
Citations Scopus - 6
Co-authors Richard Middleton
2007 Rojas AJ, Braslavsky JH, Middleton RH, 'Output feedback sensitivity functions under signal to noise ratio constraint', 2007 AMERICAN CONTROL CONFERENCE, VOLS 1-13 (2007)
Co-authors Richard Middleton
2007 Freudenberg JS, Middleton RH, Braslavsky JH, 'Stabilization with disturbance attenuation over a Gaussian channel', PROCEEDINGS OF THE 46TH IEEE CONFERENCE ON DECISION AND CONTROL, VOLS 1-14 (2007)
Co-authors Richard Middleton
2007 Godoy BI, Braslavsky JH, Agueero JC, 'A model-based feedback control strategy for heap bioleaching processes', PROCEEDINGS OF THE 46TH IEEE CONFERENCE ON DECISION AND CONTROL, VOLS 1-14 (2007)
Co-authors Juan Aguero
2007 McVinish R, Braslavsky JH, Mengersen K, 'A Bayesian - Decision Theoretic Approach to Model Error Modeling', Preprints of the 14th IFAC Symposium on System Identification (2007) [E1]
2007 Godoy BI, Braslavsky JH, Aguero JC, 'A model-based feedback control strategy for heap bioleaching processes', Proceedings of the 46th IEEE Conference on Decision and Control 2007 (2007) [E1]
Citations Scopus - 1
Co-authors Juan Aguero
2007 Lau K, Braslavsky JH, Goodwin GC, 'Errors-in-variables problems in transient electromagnetic mineral exploration', Proceedings of the 46th IEEE Conference on Decision and Control 2007 (2007) [E1]
Citations Scopus - 3
Co-authors Graham Goodwin
2007 Freudenberg JS, Middleton RH, Braslavsky JH, 'Stabilization with disturbance attenuation over a Gaussian channel', Proceedings of the 46th IEEE Conference on Decision and Control, 2007 (2007) [E1]
DOI 10.1109/cdc.2007.4434535
Citations Scopus - 36
Co-authors Richard Middleton
2006 Braslavsky JH, Kofman E, Felicioni F, 'Effects of time quantization and noise in level crossing sampling stabilization', Proceedings of AADECA 2006 (2006) [E1]
2006 Braslavsky JH, Middleton RH, Freudenberg JS, 'Effects of Time Delay on Feedback Stabilisation over Signal-To-Noise Ratio Constrained Channels', Proceedings of 16th IFAC World Congress (2006) [E1]
Co-authors Richard Middleton
2006 Kofman E, Braslavsky JH, 'Level Crossing Sampling in Feedback Stabilization under Data-Rate Constraints', Proceedings of the 45th IEEE Conference on Decision and Control (2006) [E1]
Citations Scopus - 110Web of Science - 56
2006 Rojas AJ, Freudenberg JS, Braslavsky JH, Middleton RH, 'Optimal Signal to Noise Ratio in Feedback over Communicatiion Channels with Memory', Proceedings of the 45th IEEE Conference on Decision and Control (2006) [E1]
Citations Scopus - 9Web of Science - 6
Co-authors Richard Middleton
2006 Rojas AJ, Braslavsky JH, Middleton RH, 'Output Feedback Stabilisation over Bandwidth Limited, Signal to Noise Ratio Constrained Communication Channels', Proceedings of the 2006 American Control Conference (2006) [E1]
Citations Scopus - 29Web of Science - 5
Co-authors Richard Middleton
2005 Freudenberg J, Braslavsky JH, Middleton RH, 'Control Over Signal-To-Noise Ratio Constrained Channels: Stabilization and Performance', Proceedings of 44th IEEE Conference on Decision and Control (2005) [E1]
Citations Scopus - 22Web of Science - 3
Co-authors Richard Middleton
2005 Rojas AJ, Braslavsky JH, Middleton RH, 'Control Over A Bandwidth Limited Signal to Noise Ratio Constrained Communication Channel', Proceedings of The 44th IEEE Conference on Decision and Control (2005) [E1]
DOI 10.1109/CDC.2005.1582154
Citations Scopus - 19Web of Science - 8
Co-authors Richard Middleton
2004 Middleton RH, Braslavsky JH, Freudenberg J, 'Stabization of non-minimum phase plants over signal-to-noise ratio constrained channels', CD ROM (2004) [E1]
Co-authors Richard Middleton
2004 Braslavsky JH, Middleton RH, Freudenberg JS, 'Feedback stabilization over signal-to-noise ratio constrained channels', CD ROM (2004) [E1]
Citations Scopus - 51Web of Science - 22
Co-authors Richard Middleton
2003 Middleton RH, Lau K, Braslavsky JH, 'Conjectures and Counterexamples on Optimal L2 Disturbance Attenuation in Nonlinear Systems', Proceedings for the CDC 2003 (CD ROM) (2003) [E1]
Citations Scopus - 4
Co-authors Richard Middleton
2003 Braslavsky JH, Marqués D, Muravchik CH, 'Latin American Applied Research: Editorial', Latin American Applied Research (2003)
2002 Romero M, Braslavsky JH, Valla MI, 'A ripple minimization strategy for direct torque and flux control of induction motors using sliding modes', IFAC Proceedings Volumes (IFAC-PapersOnline) (2002)

Copyright © 2002 IFAC. We present a direct torque and flux control (DTFC) design for an electric induction motor using a sliding-mode control technique. A distinctive feature of ... [more]

Copyright © 2002 IFAC. We present a direct torque and flux control (DTFC) design for an electric induction motor using a sliding-mode control technique. A distinctive feature of our approach is that, by appropriately parameterizing and implementing the sliding-mode controller, we explicitely take into account the discontinuous nature of the actuator in the design process. As a result, we obtain an improved implementation of DTFC, which significantly reduces the levels of steady-state ripple with respect to those typically obtained with conventional implementations of DTFC.

Citations Scopus - 3
2002 Middleton RH, Braslavsky JH, 'Towards quantitative time domain design tradeoffs in nonlinear control', PROCEEDINGS OF THE 2002 AMERICAN CONTROL CONFERENCE, VOLS 1-6 (2002) [E1]
Citations Scopus - 1
Co-authors Richard Middleton
2000 Middleton RH, Braslavsky JH, 'On the relationship between logarithmic sensitivity integrals and limiting optimal control problems', CDC Downunder (2000) [E1]
Citations Scopus - 16Web of Science - 8
Co-authors Richard Middleton
1999 Arcak M, Seron M, Braslavsky J, Kokotovic P, 'Robustification of backstepping against input unmodeled dynamics', Proceedings of the IEEE Conference on Decision and Control (1999)

We present two redesigns to robustify backstepping control laws against dynamic uncertainties at the input of the plant. In the first redesign we construct a passivating control l... [more]

We present two redesigns to robustify backstepping control laws against dynamic uncertainties at the input of the plant. In the first redesign we construct a passivating control law from a CLF obtained by backstepping. In the second redesign we simplify the passivation redesign which becomes cumbersome for high order systems. We also review the two main versions of backstepping: cancelation and L G V-backstepping, and compare their stability margins.

Citations Scopus - 4
Co-authors Maria Seron
1999 Reinelt W, Garulli A, Ljung L, Braslavsky JH, Vicino A, 'Model error concepts in identification for control', Proceedings of the IEEE Conference on Decision and Control (1999)

We examine some recent methods for System Identification, that also deliver non-parametric error bounds, suited for a robust controller design. In particular, we look at Stochasti... [more]

We examine some recent methods for System Identification, that also deliver non-parametric error bounds, suited for a robust controller design. In particular, we look at Stochastic Embedding, Set Membership Identification and Model Error Modelling. We briefly review the main ideas together with existing computational solutions and present a comparative example.

Citations Scopus - 7
1999 Goodwin GC, Braslavsky JH, Seron MM, 'Non-Stationary Stochastic Embedding for Transfer Function Estimation', IFAC World Congress 1999 (1999) [E1]
Co-authors Graham Goodwin
1999 Braslavsky JH, Middleton RH, Freudenberg JS, 'Cheap Control Performance of a Class of Non-Right-Invertible Nonlinear Systems', Proceedings of the 38th Conference on Decision and Control (1999) [E1]
Citations Scopus - 12Web of Science - 10
Co-authors Richard Middleton
1999 Braslavsky JH, Middleton RH, Freudenberg JS, 'Performance Limitations in a Class of Single-Input Two-Output Nonlinear Systems', Proceedings of the American Control Conference (1999) [E1]
Citations Scopus - 2
Co-authors Richard Middleton
1998 Braslavsky JH, Seron MM, Kokotovic PV, 'Near-optimal cheap control of nonlinear systems', NONLINEAR CONTROL SYSTEMS DESIGN 1998, VOLS 1& 2 (1998)
Co-authors Maria Seron
1997 Seron MM, Braslavsky TH, Kokotovic PV, Mayne DQ, 'Feedback limitations in nonlinear systems: From Bode integrals to cheap control', PROCEEDINGS OF THE 36TH IEEE CONFERENCE ON DECISION AND CONTROL, VOLS 1-5 (1997)
Citations Scopus - 9Web of Science - 5
Co-authors Maria Seron
1996 Braslavsky JH, Seron MM, Goodwin GC, Grainger RW, 'Tradeoffs in multivariable filter design with applications to fault detection', PROCEEDINGS OF THE 35TH IEEE CONFERENCE ON DECISION AND CONTROL, VOLS 1-4 (1996)
Citations Scopus - 2Web of Science - 1
Co-authors Graham Goodwin, Maria Seron
1995 Braslavsky J, Middleton R, Freudenberg J, 'Frequency response of generalized sampled-data hold functions', PROCEEDINGS OF THE 34TH IEEE CONFERENCE ON DECISION AND CONTROL, VOLS 1-4 (1995)
Citations Scopus - 3
Co-authors Richard Middleton
1994 BRASLAVSKY JH, MIDDLETON RH, 'ON THE STABILISATION OF LINEAR UNSTABLE SYSTEMS WITH CONTROL CONSTRAINTS', AUTOMATIC CONTROL - WORLD CONGRESS 1993, VOL 2 (1994)
Co-authors Richard Middleton
1994 FREUDENBERG J, MIDDLETON R, BRASLAVSKY J, 'ROBUSTNESS OF ZERO-SHIFTING VIA GENERALIZED SAMPLED-DATA HOLD FUNCTIONS', PROCEEDINGS OF THE 33RD IEEE CONFERENCE ON DECISION AND CONTROL, VOLS 1-4 (1994)
Citations Scopus - 2
Co-authors Richard Middleton
Show 62 more conferences

Report (1 outputs)

Year Citation Altmetrics Link
2009 Braslavsky JH, Adams GJ, Seron MM, 'Potential Research Areas in Coordinated Voltage Regulation', Energy Australia, 7 (2009) [R1]
Co-authors Maria Seron
Edit

Grants and Funding

Summary

Number of grants 16
Total funding $14,787,913

Click on a grant title below to expand the full details for that specific grant.


20151 grants / $10,000

Robustness of anti-islanding mechanisms in grid and mini-grid connected smart inverters.$10,000

Funding body: CSIRO - Commonwealth Scientific and Industrial Research Organisation

Funding body CSIRO - Commonwealth Scientific and Industrial Research Organisation
Project Team Mr Rahmatollah Heidarihaei, Doctor Maria Seron, Doctor Julio Braslavsky
Scheme Postgraduate Scholarship
Role Investigator
Funding Start 2015
Funding Finish 2015
GNo G1500936
Type Of Funding Other Public Sector - Commonwealth
Category 2OPC
UON Y

20141 grants / $319,000

Analysis and control of distributed energy resources in electrical grids$319,000

Funding body: CSIRO - Commonwealth Scientific and Industrial Research Organisation

Funding body CSIRO - Commonwealth Scientific and Industrial Research Organisation
Project Team Doctor Maria Seron, Doctor Julio Braslavsky
Scheme National Research Flagship Visiting Fellowships
Role Investigator
Funding Start 2014
Funding Finish 2016
GNo G1401392
Type Of Funding Other Public Sector - Commonwealth
Category 2OPC
UON Y

20133 grants / $135,500

Model-based estimation and control solutions to efficient network energy management$130,000

Funding body: CSIRO - Commonwealth Scientific and Industrial Research Organisation

Funding body CSIRO - Commonwealth Scientific and Industrial Research Organisation
Project Team Doctor Maria Seron, Doctor Julio Braslavsky
Scheme National Research Flagship Visiting Fellowships
Role Investigator
Funding Start 2013
Funding Finish 2014
GNo G1300783
Type Of Funding Other Public Sector - Commonwealth
Category 2OPC
UON Y

CSIRO Travel Alvarez$4,000

Funding body: CSIRO - Commonwealth Scientific and Industrial Research Organisation

Funding body CSIRO - Commonwealth Scientific and Industrial Research Organisation
Project Team Doctor Maria Seron, Doctor Julio Braslavsky
Scheme Collaborative Relationship Agreement
Role Investigator
Funding Start 2013
Funding Finish 2013
GNo G1300377
Type Of Funding Other Public Sector - Commonwealth
Category 2OPC
UON Y

CSIRO Travel Osella$1,500

Funding body: CSIRO - Energy Technology

Funding body CSIRO - Energy Technology
Project Team Doctor Maria Seron, Doctor Julio Braslavsky
Scheme Research Grant
Role Investigator
Funding Start 2013
Funding Finish 2013
GNo G1201203
Type Of Funding Other Public Sector - Commonwealth
Category 2OPC
UON Y

20101 grants / $20,000

New methods in analysis and design of switched control systems$20,000

Funding body: University of Newcastle

Funding body University of Newcastle
Project Team Doctor Julio Braslavsky, Dr Hernan Haimovich
Scheme Near Miss Grant
Role Lead
Funding Start 2010
Funding Finish 2010
GNo G0900210
Type Of Funding Internal
Category INTE
UON Y

20092 grants / $98,420

Multiobjective optimisation for building comfort and energy$78,420

Funding body: CSIRO - Energy Technology

Funding body CSIRO - Energy Technology
Project Team Doctor Julio Braslavsky, Dr John Ward
Scheme Postgraduate Research Scholarship
Role Lead
Funding Start 2009
Funding Finish 2011
GNo G0190217
Type Of Funding Other Public Sector - Commonwealth
Category 2OPC
UON Y

Fault Accommodation in Electricity Networks$20,000

Funding body: Ausgrid

Funding body Ausgrid
Project Team Doctor Julio Braslavsky, Dr GREG Adams, Doctor Maria Seron
Scheme Sponsorship Agreement
Role Lead
Funding Start 2009
Funding Finish 2009
GNo G0900081
Type Of Funding Other Public Sector - State
Category 2OPS
UON Y

20085 grants / $6,985,561

Centre for Complex Dynamic Systems and Control$5,400,000

Funding body: ARC (Australian Research Council)

Funding body ARC (Australian Research Council)
Project Team Emeritus Laureate Professor Graham Goodwin, Professor Minyue Fu, Professor Reza Moheimani, Doctor Julio Braslavsky, Dr GREG Adams, Associate Professor Jose De Dona, Doctor Maria Seron, Doctor James Welsh, Doctor Andrew Fleming, Associate Professor Tristan Perez, Doctor Damian Marelli, Associate Professor Brailey Sims, Conjoint Professor Kerrie Mengersen, Professor A Pettitt, Dr R Reeves, Professor Ian Turner, Dr Salvatore Crisafulli, Dr M Downey, Mr J Lee, Mr P Stone, Conjoint Professor John Rayner
Scheme ARC Centres of Excellence
Role Investigator
Funding Start 2008
Funding Finish 2010
GNo G0188623
Type Of Funding Aust Competitive - Commonwealth
Category 1CS
UON Y

CDSC Sub-Account: Industrial Control and Optimization$660,000

Funding body: ARC (Australian Research Council)

Funding body ARC (Australian Research Council)
Project Team Emeritus Laureate Professor Graham Goodwin, Doctor Julio Braslavsky
Scheme ARC Centres of Excellence
Role Investigator
Funding Start 2008
Funding Finish 2010
GNo GS090004
Type Of Funding Aust Competitive - Commonwealth
Category 1CS
UON Y

CDSC Sub-Account: BHP-Billiton (IMP) and (OBOG)$600,000

Funding body: University of Newcastle

Funding body University of Newcastle
Project Team Emeritus Laureate Professor Graham Goodwin, Associate Professor Tristan Perez, Doctor Julio Braslavsky
Scheme ARC Centre sub-control account
Role Investigator
Funding Start 2008
Funding Finish 2010
GNo G0190455
Type Of Funding Internal
Category INTE
UON Y

Centre for Complex Dynamic Systems and Control$323,084

Funding body: NSW Department of State and Regional Development

Funding body NSW Department of State and Regional Development
Project Team Emeritus Laureate Professor Graham Goodwin, Professor Minyue Fu, Professor Reza Moheimani, Doctor Julio Braslavsky, Dr GREG Adams, Associate Professor Jose De Dona, Doctor Maria Seron, Doctor James Welsh, Doctor Andrew Fleming, Doctor Damian Marelli, Associate Professor Brailey Sims, Conjoint Professor Kerrie Mengersen, Professor A Pettitt, Dr R Reeves, Professor Ian Turner, Dr Salvatore Crisafulli, Dr M Downey, Mr J Lee, Mr P Stone
Scheme ARC Centres of Excellence Partner Funding
Role Investigator
Funding Start 2008
Funding Finish 2010
GNo G0189187
Type Of Funding Other Public Sector - State
Category 2OPS
UON Y

17th IFAC World Congress - Convention and Exhibition Centre, Seoul Korea, 6/7/2008 - 11/7/2008$2,477

Funding body: University of Newcastle

Funding body University of Newcastle
Project Team Doctor Julio Braslavsky
Scheme Travel Grant
Role Lead
Funding Start 2008
Funding Finish 2008
GNo G0188916
Type Of Funding Internal
Category INTE
UON Y

20032 grants / $7,179,432

Centre for Complex Dynamic Systems and Control.$6,929,432

Funding body: ARC (Australian Research Council)

Funding body ARC (Australian Research Council)
Project Team Professor Rick Middleton, Emeritus Laureate Professor Graham Goodwin, Professor Minyue Fu, Conjoint Professor Kerrie Mengersen, Professor Iain Raeburn, Professor Reza Moheimani, Dr William Heath, Doctor Julio Braslavsky, Associate Professor Jose De Dona, Doctor Richard Gerlach, Doctor Maria Seron, Associate Professor Brailey Sims
Scheme ARC Centres of Excellence
Role Investigator
Funding Start 2003
Funding Finish 2007
GNo G0182216
Type Of Funding Aust Competitive - Commonwealth
Category 1CS
UON Y

Optimisation-based operator guidance (OBOG)$250,000

Funding body: BHP Billiton Innovation Pty Ltd

Funding body BHP Billiton Innovation Pty Ltd
Project Team Professor Rick Middleton, Emeritus Laureate Professor Graham Goodwin, Doctor Julio Braslavsky
Scheme ARC Centres of Excellence Partner Funding
Role Investigator
Funding Start 2003
Funding Finish 2007
GNo G0185849
Type Of Funding Contract - Aust Non Government
Category 3AFC
UON Y

20011 grants / $40,000

Performance Limitations and Design of Nonlinear Control Systems$40,000

Funding body: National Agency for the Promotion of Science and Technology

Funding body National Agency for the Promotion of Science and Technology
Project Team

Julio Braslavsky

Scheme FONCYT Scientific and Technological Research Project Grant
Role Lead
Funding Start 2001
Funding Finish 2002
GNo
Type Of Funding International - Non Competitive
Category 3IFB
UON N
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Research Supervision

Number of supervisions

Completed6
Current2

Total current UON EFTSL

PhD0.4

Current Supervision

Commenced Level of Study Research Title Program Supervisor Type
2016 PhD New Compensation Techniques to Enhance the Quality of Electrical Power Systems in Vietnam PhD (Electrical Engineering), Faculty of Engineering and Built Environment, The University of Newcastle Co-Supervisor
2016 PhD Co-ordinated Control of Distributed Inverters Connected to Low Voltage Grids PhD (Electrical Engineering), Faculty of Engineering and Built Environment, The University of Newcastle Co-Supervisor

Past Supervision

Year Level of Study Research Title Program Supervisor Type
2016 PhD Ultimate Bound Analysis and Optimisation with Application to Energy Systems Stability PhD (Electrical Engineering), Faculty of Engineering and Built Environment, The University of Newcastle Co-Supervisor
2016 PhD Distributed Load Management Supporting Power Injection and Reactive Power Balancing PhD (Electrical Engineering), Faculty of Engineering and Built Environment, The University of Newcastle Co-Supervisor
2013 PhD Dynamic Modelling and Control of Heterogeneous Populations of Thermostatically Controlled Loads PhD (Computer Engineering), Faculty of Engineering and Built Environment, The University of Newcastle Co-Supervisor
2008 PhD Modelling and Feedback Control of Copper Heap Bioleaching Processes PhD (Electrical Engineering), Faculty of Engineering and Built Environment, The University of Newcastle Principal Supervisor
2007 PhD Feedback Control Over Signal to Noise Ratio Constrained Communication Channels PhD (Electrical Engineering), Faculty of Engineering and Built Environment, The University of Newcastle Co-Supervisor
2007 PhD Direct torque and flow control of an induction machine using sliding modes with ripple reduction techniques Electrical Engineering, National University of La Plata Co-Supervisor
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Dr Julio Braslavsky

Position

Conjoint Senior Lecturer
CSIRO Energy
School of Elect Engineering and Computer Science
Faculty of Engineering and Built Environment

Focus area

Electrical and Computer Engineering

Contact Details

Email julio.braslavsky@newcastle.edu.au
Phone (02) 4960 6071
Fax (02) 4960 6021
Link Personal webpage

Office

Building CSIRO Energy Centre
Location 10 Murray Dwyer Circuit Mayfield West NSW 2304

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