Research on steady state voltage stability of power system with distributed static series compensator

Distributed static series compensator (DSSC) is a new type of distributed FACTS devices that can realize accurate control of power flow and enhance voltage stability. Thus, it could be installed in stability-limited transmission systems widely. This paper presents a new capacity control model for DSSCs and deduces the corresponding power flow equations. To illustrate the effect on system power voltage stability of DSSCs utilization, a voltage stability index based on power flow of transmission line is proposed. Numerical analysis on the standard IEEE test system is conducted to examine the effect of DSSCs on the voltage stability index. The results indicate the effectiveness of proposed control model and reveal that appropriate location and compensation mode of DSSCs improve system voltage stability.