Design and application of a nonlinear coordinated excitation and TCPS controller in power systems

This paper presents a new approach to thyristor controlled phase shifter (TCPS) control. We propose a nonlinear coordinated generator excitation and TCPS controller to enhance the transient stability of a power system. The proposed controller is able to control the three main parameters affecting AC power transmission: namely the excitation voltage, phase angle and reactance in a coordinated manner. The TCPS is located at the midpoint of the transmission line. A nonlinear feedback control law is proposed to linearize and decouple the power system. The design of the proposed controller is based on the local measurements only. Digital simulation results are shown to demonstrate the effectiveness of the proposed controller for the enhancement of transient stability of the power system under a large sudden fault.