一种并联风电机组低电压穿越调控装置

摘要

采用风力发电时,为减小短时间电压跌落故障对电网安全稳定运行的影响,风力发电机组必须要具备低电压穿越能力.设计了一种新的拓扑结构,该结构在传统异步风力发电系统基础上,新增了用于解决低电压穿越问题的模块电路,并分别对各模块利用定电压控制与基于无功功率理论的矢量变换控制算法等方法,模拟了电网在不同运行状态下无功功率的补偿办法,并取得了良好的效果.经PSCAD/EMTDC仿真分析,此装置的设计能够使风电机组实现低电压穿越.%To minimize the influence of short time voltage sags in the power grid to safe and stable operation with wind power generation, the units must be equipped with low voltage ride through ( LVRT) ability. Paralleled integrated control equipment which adds module circuits to traditional wind power system was proposed. With rated voltage and vector transform control, these modules could stabilize voltage and provide reactive power in different conditions. Simulation models about the equipment were built based on PSCAD / EMTDC platform. The analysis verified the equipment's achievement of LVRT.