Dynamic phasor modelling of TCR based FACTS devices for high speed power system fast transients simulation

Abstract

This paper firstly proposes a generic dynamic phasor model of thyristor controlled reactor (TCR) at the device level. The modelling approach is based on the time-varying Fourier coefficient series of the power system variables. By truncating the less important higher order terms and keeping the significant ones, this dynamic phasor TCR model can realistically simulate the nonlinear characteristics of TCR with fast speed and high accuracy. The operation of anti-parallel-connected thyristor pair is simulated by a switching function. Based on this TCR dynamic phasor model, fast and efficient SVC and TCSC dynamic phasor models could then be implemented. While a simple power system was used for the device level evaluation, the 39-bus New England power system were built to fully verify the accuracy and efficiency of the propose dynamic phasor models by benchmarking with a commercial software named DCG-EMTP. The availability of fast and efficient dynamic phasor models for FACTS devices has provided a powerful basis for high speed power system fast transients simulation of large scale interconnected power systems.