Interaction analysis of SVC and STATCOM controllers based on RGA principle

With the wide applications of flexible AC transmission system (FACTS) devices, a potential risk of interaction between FACTS controllers may impose negative influence on practical power systems. The results of a time-domain simulation of a single-machine infinite-bus power system demonstrate the possibility of the negative interactions between Static Var Compensators (SVC) and Static Synchronous compensator (STATCOM). The Phillips-Heffron model of a single-machine infinite-bus power system with one SVC and one STATCOM installed was established. Then, relative gain array (RGA) theory was proposed for analyzing the interaction between SVC and STATCOM. Based on the RGA analysis, the influence caused by the electrical distance between two FACTS devices was investigated emphatically. The detailed nonlinear simulation results demonstrate the effectiveness of the proposed RGA theory.