The Output Power Smoothing Method and Its Performance Analysis of Hybrid Energy Storage System for Photovoltaic Power Plant

Photovoltaic (PV) generation are of obvious intermittency and fluctuation, which seriously affects safe and stability operation of network. To solve this problem, the paper studies the output power smoothing performance of hybrid energy storage in PV power plant. The model of PV power system with hybrid energy storage unit is built. A control strategy of a hybrid energy storage system (HESS) using a first-order filtering algorithm and dual closed-loop PI control is designed. The results show the proposed power control strategy of PV-HESS can effectively smooth the power fluctuation of PV power generation and stabilize the output power of the PV system in different conditions.