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With the process of global industrialization , human demand for energy is growing. Fossil fuels as the main energy structure of human damage to the environment is obvious , it is one of the main reasons that cause air pollution and ecological destruction . In the face of the worsening of the worldwide energy crisis and environmental pressure , people are eager to use renewable energy instead of limited resources , the pollution of the environment of conventional energy . Solar energy as one of today 's most resource-rich renewable energy , it has a wide distribution , renewable , clean, safe , and many other advantages to become internationally recognized as an ideal alternative energy . Solar photovoltaic power generation is one of the main development direction in the use of solar energy . The photovoltaic power generation system with the public grid connection, shared power supply tasks , the current mainstream of the development trend of the world's solar photovoltaic technology . The power peaking generation to give back to the grid , the grid as an energy storage device , compared with an independent solar photovoltaic systems greatly reduce the cost of power generation and grid system can be achieved . For this reason , research and power generation systems is of great practical significance . In this paper, the study from the following aspects : 1 introduces the research background and research status of photovoltaic power generation , and a brief introduction to the advantages and disadvantages of the composition of the photovoltaic power generation system , type and power generation systems ; 2 PV array important unit of the photovoltaic power generation system , the operating characteristics of the PV array . 3 , the maximum power point tracking problems is the key issues in the photovoltaic power generation system , based on this , the details of several commonly used MPPT control method . At the same time , islanding protection effect of the photovoltaic power generation system . Designed 4Kw small grid-connected PV systems , including forms of electricity generation , array design , and system equipment : inverters , photovoltaic cells were selected . 5 , to test the performance of the PV array , the test results show that : 4KW PV systems to meet the general residential electricity needs , the annual generating capacity can provide 2016Kw.h . Finally , it is pointed out that the problems in the current photovoltaic power generation system , a little advice and opinions .
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