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Optimal Steady-State Control with Application to Secondary Frequency Control of Power Systems

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MESW03 - Closing workshop: Looking forward to 2050

The optimal steady-state control problem is that of designing a feedback controller for a multivariable system which regulates selected system variables to the solution of a constrained optimization problem, despite parametric modelling uncertainty and unmeasured exogenous disturbances. For example, an instance of this problem occurs in the design of secondary frequency control systems, where control resources should be optimally used subject to the elimination of frequency deviations and restoration of inter-area tie-line flows. We present a constructive design framework that reduces the OSS control problem to a more classical control problem of output regulation (tracking and disturbance rejection). Robustness issues which arise in the constructive procedure are discussed, leading to a solution of the OSS control problem for the case where the plant is LTI with structured parametric uncertainty and unknown disturbances are constant in time. We apply the results to frequency control of power systems show that the OSS control framework recovers several recent decentralized and distributed secondary frequency controllers from the literature.

Collaborators: Liam S. P. Lawrence (UWaterloo) and Enrique Mallada (JHU)

This talk is part of the Isaac Newton Institute Seminar Series series.

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