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UBC Theses and Dissertations

Optimal control and stabilization signals for a power system Siggers, Christopher


Present trends toward long distance extra high voltage transmission lines and static excitation can cause a reduction in the stability margins of a typical power system unless measures are taken to improve the system damping. Practical applications of stabilizing signals are investigated in this thesis and limitations of the design techniques discussed. An optimal control signal is derived from modern control theory. All signals are obtained from a common linearized power system and the performance is tested for large disturbance conditions on a single machine-infinite bus system where the machine, exciter and governor are represented in detail. Both types of signals are also tested on a practical four machine system model and it is shown that a similar improvement in damping can be obtained with either a stabilizing signal derived using conventional frequency response techniques or a proportional feedback controller obtained from solution of the algebraic matrix Riccati equation.

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