Aggregate Model of Massive Distributed Energy Storage for Power System Operation

Abstract

Distributed energy storage (DES) has been expanding rapidly in recent years. Since the amount of DES is large while the capacity of single DES is small and the parameters of DES vary considerably, it is hard to consider the detailed model for each DES in power system operation such as unit commitment and economic dispatch. This paper proposes an equivalent aggregate model for massive DESs. The concepts of extreme charging and discharging curves are first proposed to describe the key operational characteristics of DES. On this basis, the aggregation methodology is proposed. Case studies of 1000 DESs show that the proposed method is an effective and conservative approximation of massive DESs.