双馈风力发电机组撬棒电路保护技术的研究

Crowbar Circuit Protection Technology of Double-FED Induction Generators

当电力系统电压出现跌落时,大容量风电场的切出会影响系统运行的稳定性,这就要求风电机组具备低电压穿越(LVRT)能力,以保证系统出现电压跌落时风电机组不间断并网运行。此处根据双馈风电机组LVRT原理对转子撬棒保护电路的控制策略及其投切时刻的整定进行了研究,推导出撬棒电阻的取值范围,对影响撬棒电路保护效果的各种因素进行了分析,并通过仿真验证了结论的正确性。

When the grid voltage dips,the large capacity wind farm＇s resection will affect the grid stability,so it re-quires the wind generators must have LVRT ability to ensure themselves to keep parallel operating continuously when voltage dips.According to the LVRT technology,this paper researches on the control strategy of the crowbar protection circuit and the setting moment of the crowbar circuit,and derives the value range of the resistor in the crowbar cir-cuits and analyzes other factors that influence the crowbar protection effect.Finally,all the conclusions are verified by simulation in the Matlab/Simulink.