Modelling, Dynamics and Control of Aggregate Loads

Ian Hiskens
Professor, Electrical Engineering and Computer Science
Vennema Professor of Engineering
University of Michigan

Abstract: Analysis, simulation and control of large populations (ensembles) of small loads is achieved using aggregate load models. Aggregation of loads that operate according to hysteresis controls, for example thermostatically controlled loads (TCLs) such as residential air-conditioners and heat pumps, is of particular interest. So-called bin models form the basis for capturing the dynamic response of such load aggregations. The presentation will consider the accuracy and fidelity of bin models. Various load ensemble control strategies are prone to undesirable, highly nonlinear forms of behavior including synchronization, sustained oscillations and bifurcations. The nature of such dynamic behavior will be explored and the implications for controller design will be considered.

Bio: Ian A. Hiskens is the Vennema Professor of Engineering in the Department of Electrical Engineering and Computer Science, University of Michigan, Ann Arbor. He has held prior appointments with the Queensland electricity supply industry, and various universities in Australia and the United States. His research interests lie at the intersection of power system analysis and systems theory, with recent activity focused largely on integration of renewable generation and controllable loads. Dr. Hiskens is involved in numerous IEEE activities in the Power and Energy Society, Control Systems Society, Circuits and Systems Society and Smart Grid Initiative, and has served as VP-Finance of the IEEE Systems Council. He is a member of the Editorial Board of the Proceedings of the IEEE. He is a Fellow of IEEE and a Fellow of Engineers Australia. Dr. Hiskens is a Chartered Professional Engineer in Australia and the 2020 recipient of the M.A. Sargent Medal from Engineers Australia.