An approach to voltage quality improvement by introduction of STATCOM for distribution system with renewable power generations

In the recent years, along with the increasing integrations of renewable power generations into the distribution systems, some serious problems such as fluctuation, rise and imbalance, etc. may occur to the voltage of distribution system. This paper make an approach aiming at obtaining mitigation effects of both rise and imbalance in the voltage so as to improve the distribution voltage quality by introducing STATCOM (Static Synchronous Compensator) device into a distribution system with renewable power generations. A STATCOM model with relatively lower cost and simple structure was proposed based on the existing technologies, and digital simulation were conducted considering a typical distribution system being integrated by large numbers of photovoltaic power generator, which is estimated probably to appear in the near future. The simulation results have verified the voltage quality enhancement effects by introduction of STATCOM device.