Research on the Interaction between SVC and TCSC Based on the Modal Series Method

The controllers of flexible AC transmission system (FACTS) devices are generally designed independently without considering the possible interactions between the devices. As the number of FACTS devices increases, the effect of their interactions on the system becomes more significant. Therefore it is necessary to study the interaction between FACTS devices. In this paper, an interaction analysis method based on the modal series method is proposed for two common FACTS devices, static var compensator (SVC) and thyristor controlled series compensator (TCSC). The analytical results show that there is indeed a strong interaction between SVC and TCSC, and the effectiveness of the proposed method is demonstrated by time-domain simulation.