Photovoltaic Generation System Control Technique Under The Actual Grid Environment

The major cities of fog and haze in China, environmental issues can not beignored, development and utilization of new and renewable energy sources isimminent, solar energy as a source of energy, its usage is also highly regarded, butmainly in the form of solar energy is solar power. In recent years, the globalphotovoltaic power generation system and network capacity increased year by year, italso means that large-capacity grid-connected photovoltaic power generation systemwith the interaction between can not be ignored. Therefore, the study of photovoltaicsystems and network control increasingly profound study of the original ideal gridenvironment can not meet the actual demand, and actual network environment andnetwork control and research has practical significance. According to the actualsituation of the modern power grid, the paper under real network environment, andenhance the control technology of photovoltaic power generation system werestudied.This article contains a negative sequence on the grid and5th,7th harmonics, thephotovoltaic power generation system mathematical model of the in-depth study, andstudy its control strategy based on the mathematical model. In this paper, themathematical model of the ideal grid photovoltaic power generation system based onthe environment, through the coordinate transformation, namely the establishment ofa synchronous speed forward, reverse synchronization speed, reverse and forward5times7times synchronous speed synchronous speed of four rotating coordinatesystem mathematical model. On the basis of mathematical models in differentcoordinate systems on more in-depth perspective of energy conservation, studydeduced PV system output power, and the power contained in the compositionaccording discussed photovoltaic inverter systems and network control goals.By decomposing the task under reasonable and planned step by step, this paperis not only to establish a different network environment, photovoltaic powergeneration system and network mathematical model to study the control. And in thePSCAD/EMTDC simulation validation, not only confirmed the correctness of themodel, but also demonstrate the effectiveness of control methods.