Transient stabilization using adaptive excitation and dynamic brake control

Abstract In the event of severe disturbances, a power system can undergo structural changes, following the clearing of faults by protection gear. The response of the power system is then highly nonlinear. In this paper, a nonlinear adaptive excitation and dynamic brake controller is proposed, to enhance the transient stability of a power system. The thyristor-controller braking resistor is located near the generator terminal. Nonlinear feedback control laws are found which linearize and decouple the power system. An adaptive control law is used to design the controller. The controller design is based on local measurements, and it is independent of operating points and fault locations. Simulation results demonstrate that the proposed controller can ensure transient stability of the power system under a large sudden fault which may occur at the generator bus terminal.

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