Abstract
Excitation control is one of the most effective means to improve the dynamic performance of power systems. This paper investigate the switched excitation control of power systems with generator tripping operation under emergency. First, we discuss the dynamics of the generators under different operating conditions and put forward a switched power system model. Then, the switched dynamic model is transformed to its equivalent switched dissipative Hamiltonian system via a proper pre-feedback control, based on which an energy-based switched excitation controller is constructed. Using the Hamiltonian functions of the subsystems as multiple Lyapunov functions, the stability of the closed-loop system is analyzed. Simulation results show that the proposed switched excitation controller can effectively improve the transient stability of the power systems.
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