Research On The Technology Of Off Grid Photovoltaic Power Generation

At present,the world economy is growing rapidly,fossil fuels can’t satisfy the human development,energy shortage is a serious problem facing humanity.Combustion of fossil fuels,making human life environment is getting worse,destruction of the environment is another serious problems facing humanity.Therefore,we need to speed up the development and utilization of new energy.Solar energy as a renewable energy source,is not only sufficient,but also clean energy.Solar power technology is more and more popular,and off-grid PV technology is an important part of solar power technology.Through the study of maximum power point tracking,stored energy and inverter technology,the development of photovoltaic technology status is described.The equivalent model of photovoltaic cells is studied in this paper,analysis of output characteristics of photovoltaic cells,presents a golden section method in combination with new model predictive control method of maximum power point tracking,and to simulate it on MATLAB/Simulink.Then,this paper describes working principle,specifications and how they charge and discharge of battery,select the Buck/Boost circuit of H bridge as the battery charge and discharge control circuit and the voltage and current double closed-loop control circuit switch control,to make the battery is properly charged and discharged.Inverter is single-phase full-bridge topology and using bipolar SPWM modulation and closed-loop control strategy for its control of the output voltage.This article describes the overall structural design of photovoltaic power generation control system.The overall structure of the off-grid PV technology’s control system is verified by MATLAB/Simulink.Based on TI’s F28335 control chip,maximum power point tracking is performed in the CCS6.0 software control algorithm and programming of Inverter control algorithm and experimentally verified the golden section method in combination with model predictive control algorithm of maximum power point tracking accuracy,excellence and the output voltage of the inverter closed-loop control strategy is correct.