Research On Photovotaic Grid Generation System Based On DSP

With the increment of energy consuming and deterioration of ecosystem enviroment,many countries around the world are positively looking for a kind of sustainable developing and no pollution new energy.Solar energy is especially concerned by human because of its high efficiency and free pollution.Currently many countries attach great importance to developing solar photovoltaic (PV) system.Photovoltaic grid connected generate electricity technology among them have become the main form of the solar application. Based on it, this paper introduces residential PV grid connected system in detail and researches on its control method deeply.Solar array maximum power point tracking (MPPT) control and photovoltaic grid connected inverter control are the two core part of PV grid connected system.Firstly,this paper introduces the operational principle and performance characteristic of PV cells,and describes the equivalent circuit and mathematical model detailly.Secondly, this paper introduces several traditional Maximum Power Point Tracking (MPPT) control algorithms. By comparising these control algorithms,the respective advantages and disadvantages have been found. Based on the maximum power of the fast track process and stability, gradual approximation is designed to achieve photovoltaic solar power generation system of the maximum power output and improve system performance and maximum power point tracking speed.Thirdly, based on photovoltaic inverter control targets, the common gird control methods are studied.Refer to the information at home and abroad, Repetitive-PI control as control strategy of photovoltaic grid inverter is determined.Finally, based on TMS320LF2407 high-speed digital signal processors, photovoltaic grid generation system is designed.The hardware and software flow chart parameters and the waveform analysis of experiments and simulation is shown at last.