| The over-exploitation and utilization of traditional energy has led to a growingnumber of environmental problems， which is increasingly threatening the survivalof humanity. People realized the importance and the urgency of the development ofnew energy.Solar photovoltaic power is favored by people for its advantages ofcleaning, non-polluting, without geographical restrictions, safe and reliable.This paper presents about the design and research of small solar photovoltaicsystem, combined with the construction of5kW grid-connected photovoltaic systemin the roof of National Center of Supervision&Inspection on Photovoltaic ProductQuality. It gives the theoretical analysis and scheme of four parts, such as PVmodules, grid-connected inverter, system installation and design, system monitoringoperation, verifies the performance of some system components. The items ofresearch are listed as follows:(1) Analyzes the basic principle of cells, the output characteristics of PVmodule, the effects of light intensity, temperature variation of environmental impacton the output characteristics of PV modules. Then, the advantages anddisadvantages of three kinds of control modes for the maximum power pointtracking are studied. According to the system design requirements, determines thetype of PV module and photovoltaic arrays in series and parallel.(2) Analyzes the selection of grid-connected inverter, studies the principle ofgrid-connected inverter islanding protection, operating voltage and operatingfrequency protection function.According to the product standards, tests the inverterislanding protection, operating voltage, operating frequency protection function.Studies and analyzes the array grid-connected system installation angle, bracket andthe photovoltaic system lightning protection.(3) Use the system monitoring software to list the power data one day and totalgenerating capacity of the system, showing the economic and environmentalbenefits of this photovoltaic system. |
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