Research On Multi-mode Control Technology Of Solar-Storage Complementary Power Generation System

In face of the growing energy demand of economic social,the increasingly depletion of traditional fossil;fuels and the continued deterioration of the ecological environment,the new energy distributed power generation technology get more and more attention and application in society,then a energy revolution is taking the place of energy production and consumption.This paper mainly focuses on the research of photovoltaic and energy storage hybid system,and the studied works as follow:The photovoltaic cell output characteristics are analyzed,the engineering mathematical model of photovoltaic cells is studed,on the basis,the simulation model of the photovoltaic cells is established on Matlab.then,the artical introduce fuzzy algorithm as the maximum power point tracking control method,and do simulation by imtating different conditions of lighting and temperature,at last,the simulation result verify the effectiveness of the photovoltic array model.The mathematical model of battery is introduced,and so the battery simulation model is identified.Then,the battery capacity is defined and the design parameters of the main circuit are determined.A small signal dynamic model of bidirectional DC/DC converter is established,in order to study the response characteristics under different control strategies for the system,by doing it,finally to determine a control strategy of the voltage as the outer loop and current as the inner loop,on the basis,building the simulation model of battery energy storage system,at last,verifying the feasibility of the model by the simulation result.Analyzing the operation mode and the control strategy of photovoltaic and energy storage hybid system,combining with the characteristics of the control objectives and control strategy,this paper propose a new control strategy that adapt for system working on different operation mode,peer to peer control apply to grid-connected mode and the master-slave control apply to inslanded mode,the inverter of photovoltaic only adopts PQ control strategy,the inverter of energy storage adopts a integrated control strategy that combined PQ control with V/F control,to ahive smooth handoff with the help of parameter tracking.Finally,the simulation model of the hybid system is builted,the simulation results can meet the requirements of power quality when the system operate under different modes,and the results also verifies the feasibility of the model.