基于低壓配網(wǎng)電壓質量的光伏并網(wǎng)逆變器的控制方法研究
[Abstract]:With the increasingly depletion of fossil energy and the increasingly prominent environmental problems, the development of clean energy has become a contemporary trend. Solar energy with its unique advantages as an ideal green energy has been favored by domestic and foreign researchers, photovoltaic grid-connected power generation technology has been rapid development. In distributed generation system, grid-connected inverter plays an important role. Its control strategy determines the power quality of distribution network, the capacity of PV integrated into the grid, and the permeability of photovoltaic in the grid. Therefore, the control method of grid-connected inverter is studied in this paper. Firstly, the topology of grid-connected photovoltaic inverter with different classification is discussed, and according to the characteristics of distributed photovoltaic generation connected to distribution network system, the topology type of distributed photovoltaic power generation system is established in this paper. Secondly, in order to reduce the pollution caused by the connected distributed photovoltaic power supply and improve the voltage quality of the distribution network, this paper analyzes the mechanism of the voltage quality problem caused by the incorporation of the photovoltaic power source into the distribution network. By discussing the traditional measures to improve the voltage quality of distribution network and its limitations, it is proposed that the method of controlling the inverter to solve the voltage quality problem caused by the incorporation of photovoltaic into the distribution network is a hot research topic. In view of the fact that the R / X value of the distribution network circuit is far greater than that of the transmission line, the assumption of limiting the active power output of the photovoltaic power supply into the distribution network is put forward preliminarily, and the rationality and feasibility of the assumption are studied. Finally, by comparing and analyzing the control methods of various photovoltaic grid-connected inverters proposed by domestic and foreign power experts, considering the voltage quality of distribution network, network loss, line capacity, inverter capacity, power factor and so on, comprehensive consideration of the distribution network voltage quality, network loss, line capacity, inverter capacity, power factor, etc. The traditional control strategy is optimized, and the improved control method of grid-connected photovoltaic inverter is proposed, and the effectiveness of the control strategy is verified by simulation.
【學位授予單位】:華北電力大學
【學位級別】:碩士
【學位授予年份】:2017
【分類號】:TM464
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