Pv System Based On The Equivalent Impedance Matching Method And Controlled By Dsp

With the development of economy and the progress of the society, more and moreattention has been paid to the energy problem and environmental pollution. Solar energyas an inexhaustible clean energy has been widely concerned. The development space ofphotovoltaic industry is vast. Photovoltaic industry has a bright future. But it also is facingsome problems, such low energy conversion efficiency and high cost, which restrict therapid development of photovoltaic industry. Therefore, study the PV system deeply toimprove the efficiency of power generation, which has important significance to alleviatethe energy crisis and protect the environment.The photovoltaic power generation system based on the equivalent impedancematching method which is controlled by DSP is designed in this paper. Firstly theapplication and development of photovoltaic power generation system is summarized.Structures of photovoltaic power generation system are summarized. Then problems of thephotovoltaic power generation system are introduced, and the significance and the maincontent of the research are pointed out. Also the performance of photovoltaic battery andstorage battery in this photovoltaic power generation system are analyzed. The circuitstructure of photovoltaic power generation system is determined.Secondly, the focus of this system is the control strategy of the energy management.The coordination control strategy for energy flow is proposed. According to differentenvironment, the photovoltaic battery can choose to work in maximum power pointtracking mode or a constant voltage control mode, while the battery can choose to work inthe maximum power charging mode, constant voltage and current limiting charging modeor discharging mode. The tracking control of PV cell coordinates with the charging anddischarging control strategy of battery to maintain the bus voltage stable. The controlstrategy can ensure the stable operation of the inverter. Then the operation of the wholesystem can be highly efficient and stable. The equivalent impedance matching method isused to realize the maximum power point tracking. The equivalent impedance matchingmethod is compared to other methods. The advantages of equivalent impedance matching method are highlighted.Finally, the hardware circuit design of the photovoltaic power generation system isintroduced in detail, including calculation of key parameter, selection of main device andthe winding of the inductance. Also designs of the driving circuit and the signal processingcircuit of the photovoltaic power generation system are introduced. A simple and practicalauxiliary power supply is designed. Experiment platform based on DSP digital control isset up. Simulations and experiments on this system are conducted, which can prove thefeasibility and effectiveness of the maximum power point tracking method with equivalentimpedance matching and the coordination control scheme.