Power Decoupling Control Strategy of 35 kV Cascaded H-Bridge Energy Storage System

Abstract

New energy with increasing permeability has increased the unstable factors of power system. Large-scale energy storage system compensating for the fluctuating power of new energy power generation has a high practical significance. To make full use of the regulating ability of the energy storage system, a power decoupling control model of 35kV cascaded H-bridge energy storage system is proposed with the capacity of the energy storage system. Firstly, the topology of 35kV energy storage system is given. Secondly, according to the related technical standards and requirements, the model of cascaded unit equipment of the system is determined. Based on 35kV cascaded H-bridge energy storage system, power regulation model of energy storage power conversion system (PCS) is built and the active power and reactive power decoupling control strategy for energy storage system is obtained. Finally, the control strategy is simulated and validated by using MATLAB/Simulink simulation system. The stability of the control strategy can be verified by the results.