Abstract
SUMMARYThe battery energy storage system (BESS) is prospective energy storage in the smart grid, and the hybrid energy storage system (HESS), using two different kinds of battery, is also being studied to achieve better performance and the lower cost than the single‐battery‐type BESS. However, the cost issue has not yet been evaluated explicitly. On the other hand, BESS has been studied and offers promise for ancillary service, although HESS has not been applied to frequency control in power systems. This paper focuses on the application of HESS to frequency control and its economic analysis. In this paper, the important battery characteristics in the application to a power system are introduced and two kinds of HESS are evaluated in terms of their cost when applied to frequency control. In addition, the cost HESS is used for peak shift as well as frequency control is analyzed.
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