应用于光伏电站中链式SVG的研究与设计

摘要

With the increase of the installed capacity of photovoltaic power station,the power factor and voltage stability problems are increasing seriously.Due to the fluctuation power and a large number of reactive power in the system,an extra reactive-load compensation equipment is needed to keep the voltage stable.Taking a 10 kV/12 MVA cascade static var generator(SVG) application in 50 MVA PV power station for research background,the operating principle and control method for cascade SVG are researched.Finally,the various performance experiments are done.Experimental results show that the system can accurately compensate the reactive load and keep the voltage atable,it can also has good performance in the steady state and dynamic adjustment.%随着光伏电站装机容量的增加,光伏发电的电能功率因数和电压稳定性问题日益显现.由于光伏发电的功率波动性,系统中存在大量无功,需要额外的无功补偿设备来维持电压.以一台10 kV/12 MVA链式静止无功发生器(SVG)在50 MVA光伏电站的应用为研究背景,研究了链式SVG的基本原理与控制策略,最终完成了各项性能实验,实验结果表明,系统能准确地补偿负载的无功,且能有效抑制光伏电站电压波动,具有良好的稳态和动态调节性能.