Coordinated Frequency Regulation Strategy of Pumped Storage Units and Battery Energy Storage System

Abstract

Pumped storage units and battery energy storage systems (BESS) are both capable of regulating the frequency of power grid. When renewable energy generation is integrated with the power grid, the frequency varies more, and the traditional generator does not have the sufficient ability to regulate frequency secure operation of the grid. Hence, a coordinated frequency regulation strategy for pumped storage units and BESS is proposed in this paper. The proposed coordinated control strategy is performed based on the load frequency control (LFC), so that the pumped storage units and BESS could take part in the frequency regulation of the power grid. Moreover, during auxiliary grid frequency regulation, the BESS adopts a coordinated control strategy which incorporates virtual inertia control and virtual droop control, and better frequency regulation capability can be obtained. In an analysis of how the coordinated frequency regulation of BESS and pumped storage units works, simulations are carried out on MATLAB. The results demonstrate that the frequency regulation capability of the power grid with the pumped storage units and the BESS can be improved.