Design Of Grid-connected Solar Photovoltaic System And Research On Effect Of Pv On Power Grid

When the electric power, coal, petroleum and other non-renewable energy dries frequently, the energy issue has constraints become the bottleneck of international social and economic development, more and more countries began to implement "sunshine project", the development of solar energy resources and seek new impetus of economic development. Solar energy is renewable energy sources in the nimblest and practical technology, it does not require fuel costs, so long as has the sun light place all can be used, has no pollution, no noise, power generation technology is simple, main components easy maintenance, zero fuel costs and low maintenance expenses etc.As the electric power nervous and pollution problems more and more serious, and utility grid-connected of solar photovoltaic energy system already show stronger competitiveness. Grid-connected solar photovoltaic systems can alleviate daytime power tense situation, raise grid power factor and reduce the loss of line. Construction of China's PV roof of large grid photovoltaic power station, will promote solar photovoltaic energy by"complementary energy"to"alternative energy sources"transition. Looking to the future, grid-connected solar photovoltaic energy will become one of the important generating ways.This paper first briefly introduces the principle of photovoltaic energy system, put forward power system, and design each component of the grid requirements of PV power system. Then given grid (PV) power system hardware design examples YiLiangXian of yunnan province according to the specific requirements. Finally established using phasor method and controlled source method simulation interconnection PV station electrical energy conversion and the transmission system characteristics of the model, and studies the effects of power quality and operation reliability analyses.The method and parts of statistics or analysis presented in the paper will pave a basic way and offer a design process of grid-connected photovoltaic system, and evaluates and analyses for the operation characteristic and grid influence of grid-connected photovoltaic system.