ABSTRACT
STATCOM only works for compensating reactive power, its application is limited to reactive power support in power system. As wind is an intermittent and stochastic in nature, resulting wind generator output power fluctuation cannot be smoothed by using STATCOM. In Many research papers, it has been shown that an Energy Storage System (ESS) plays an important role in power system control. In practice, by integrating an ESS with STATCOM (STATCOM + ESS) significant improvements over traditional STATCOM performance are achievable. Some of the advantages of battery technologies are of higher energy storage densities, greater cycling capabilities, better reliability, and lower cost. This combined system is capable of mitigating majority of the stability and voltage fluctuation problems in the power system. The dc link capacitor value can be reduced enormously in STATCOM-BESS topology compared to only STATCOM unit. Only a small capacitor is sufficient enough to smooth the battery dc current. This is a notable feature of integrating Energy Storage System (ESS) with STATCOM.
