Robust Coordinated Passivation Control for Generator Excitation and TCSC System

Abstract

Transient stability problem for a single machine infinite bus system with the generator excitation and thyristor controlled series compensation when damping coefficients are measured inaccurately is investigated. A robust coordinated passivation controller is designed to achieve the stability of the rotor angle and speed. The excitation voltage control is obtained by means of adaptive back-stepping method and Lyapunov stability theory using a fourth-order two-input nonlinear model. A parameter updating law is obtained simultaneously, and the reactance modulated input is derived via the coordinated passivation approach. This way the feedback passivity of the overall system is achieved and the closed-loop system is made asymptotically stable. Simulation results for a given example of the SIMB benchmark case demonstrate the effectiveness of the proposed design.