| The photovoltaic technology is a new-energy technology, which converts solar energy directly into electrieal energy with the Photovoltaic effect. The research about Photovoltaic technology is very important for solving the world'energy crisis and environmental issues. However, with the development of the domestic's Industrialization Proeess,alarge number of noulinear load appeared,harmonies and Reaetive current from nonlinear load make Power quality deteriorate inereasingly.Firstly, this paper outlines the photovoltaic industry, and then introduced the development of photovoltaic power generation system, including PV array, maximum power point tracking, inverter control and so on. Then introduced development and obstacles in the form of active power filter.Secondly, the basic model of PV cell is established to simulate its electrical characteristics, Several conventional maximum power point tracking(MPPT) methods are compared with each other and analyzed, Then take into account the environmental characteristics of large-scale PV field of PV modules, proposed a MPPT method with current testing, simulation and experimental verification of the feasibility of the method. The method also analyzed in engineering compensatory.Then, several PV grid-connected systems are introduced and analysed its principles, and also introduced Shunt Active Power Filter and its principles. Then by comparing the principle of APF and PV grid-connected systems, summed up a method to make the APF and PV grid-connected systems work together. Through MATLAB / simulink for system simulation, verify the correctness of the principle of unified control system.Finally, a 2kW experimental platform of PV grid-connected system is designed which involves design of main circuit parameters, inductance and sensing circuit and summary of PCB plate making. Then the detailed processes of the main program, interrupt service routines and the AD subprogram are proposed. The experimental results are analyzed at last. |
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