Energy Management Strategy of Photovoltaic Hybrid Energy Storage System Based on Optimal Power Distribution

Firstly, the basic architecture of photovoltaic hybrid energy storage system is introduced, including photovoltaic cells, supercapacitors and battery energy storage units. Aiming at the volatility and instability of photovoltaic power generation, a power allocation method based on supercapacitor SOC is proposed. By monitoring the SOC status of the ultracapacitor in real time, the control strategies of the Boost converter and the storage bidirectional DC/DC converter are dynamically adjusted to achieve the optimal energy allocation of the system. An improved fuzzy logic control algorithm is used to improve the precision and response speed of power allocation. The simulation results show that the proposed strategy can achieve the expected energy management effect under different lighting and load conditions, and significantly improve the energy utilization efficiency and stability of the system. In addition, this strategy can effectively extend the service life of supercapacitors and battery energy storage units, and reduce the operating cost of the system.