应用于光伏电站中链式SVG的研究与设计

Research and Design for Cascade SVG Applied in Photovoltaic Power Station

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。

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.Ex- perimental 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.