Research On Application Of Hybrid Energy Storage System In Photovoltaic Power Generation System

Along with the social progress and economic development,human demand for energy growing surge. Solar energy as a renewable clean energy is increasingly by governments to pay attention and been actively developed.However, photovoltaic power generation is susceptible to the influence of the external environment, such as temperature, light intensity, resulting in photovoltaic power generation system has generally existed power imbalance.Therefore, usually for the photovoltaic power generation system equipped with a capacity energy storage system.In this context, the paper studied the battery and super capacitor hybrid energy storage system.Firstly, this paper introduces the photovoltaic generation system with hybrid energy storage system, combined with the structure model of photovoltaic power generation system, photovoltaic energy storage system, the equivalent model and the usual parallel controller were analyzed.Then, analyzed the performance of the battery_super capacitor hybrid energy storage system, and establish three parallel model of the hybrid energy storage system.Finally selected boost converter as parallel controller, simulation results show that, in the control mode, the energy storage system to meet the load requirements, the performance is significantly improved.Secondly, this paper design the discharge control system of hybrid energy storage system.In order to make the energy storage system can provide stable and reliable voltage level to the load, the paper adopts buck_boost converter as the discharge controller system, using ADRC control system to control the discharge of the energy storage system.Through the simulation analysis proves the feasibility and superiority of this method.Finally,the paper analysis the economy of the energy storage system.Analysis the necessity of the hybrid energy storage capacity optimization,establish the capacity optimization model of energy storage system.Through the matlab platform, compiling a simplex algorithm based on capacity optimization program.The results show that the super capacitor and battery after reasonable configuration, can effectively improve the economics of the energy storage system.