双馈式风电机组低电压穿越能力检测及分析

Detection and Analysis of Low Voltage Ride Through Capability for DFIG

对风电机组低电压穿越(LVRT)能力的有效检测,是防止大规模风电机组从电网解列,保证电网安全稳定运行的前提。针对目前双馈感应发电机组(DFIG)主要采用Crowbar电路来实现LVRT的解决方案,深入研究了该方案的检测过程和参数设置,并基于对某风电场DFIG LVRT能力的现场检测,通过模拟电网发生三相相间对称故障和两相相间不对称故障,验证了检测过程和检测结果的有效性。

The effective detection of low voltage ride through（LVRT） capacity of wind turbines is the premise to pre- vent large-scale wind turbines from the grid and ensure grid seeurity and stability.According to commonly use Crowbar circuit to achieve LVRT capacity of doubly fed induction generator（DFIG）,this paper indepth researches its detection process and parameters setting, and simulates grid three-phase and two-phase short-circuit faults conditions based on field testing for LVRT capacity of DFIG selected wind farm, the validity of detection process and results is verified.