Capacity credit and reasonable ESS evaluation of power system including WTGs combined with BESS

Abstract

This paper proposes a new method for evaluating Effective Load Carrying Capability(ELCC) and Capacity Credit(C.C.) of power system including Wind Turbine Generator(WTG) combined with Battery Energy Storage System(BESS). WTG can only generate electricity power when the fuel(wind) is available. Because of fluctuation of wind speed, WTG generates intermittent power. In view point of reliability of power system, intermittent power of WTG is similar with probabilistic characteristics based on power on-off due to mechanical availability of conventional generator. Therefore, high penetration of WTG will occur difficulties in power operation. The high penetration of numerous and large capacity WTG can make risk to power system adequacy, quality and stability. Therefore, the penetration of WTG is limited in the world. This study develops a new method to assess how much is penetration of WTG able to extended when WTG is combined with BESS. This paper demonstrates a various case studies of ELCC and C.C. of power system containing WTG combined with BESS using model system as similar as Korea power system.