Research Of Grid-Connected Photovoltaic System Based On Hybrid Energy Storage

With the rapid development of photovoltaic industry, in the near future, photovoltaic(pv) grid generation will become the main form of solar photovoltaic utilization. Study of hybrid energy storage system for photovoltaic(pv) grid power generation of photovoltaic power generation system to meet the demand of power dispatching, have important research value. In this paper, the main research contents are as follows:First of all, analyses the working principle of pv array, battery and super capacitor,their general engineering model is set up, and made a simple simulation of the model, to verify the correctness of the module.Second, about the feature and shortage of traditional PID controller, fuzzy control algorithm is introduced, with the consideration of the characteristics of both the advantages of parameter self-tuning fuzzy PID control algorithm is proposed, and its working principle is analyzed.Again, the hybrid energy storage system for photovoltaic(pv) grid control,respectively from the DC side and ac busbar side tells the story of a one-way bi-directional DC/DC, DC/DC converter's working principle and parameters of multilevel SVPWM, filter design and selection.Finally, the stability of the hybrid energy storage system dc bus voltage and dc inverter grid System, set up the simulation module in Matlab, and carries on the simulation. Can be seen from the simulation results, and feasibility of building module is correct.