Abstract：To avoid the trip-off from grid caused by over-current/over-voltage of rotor-side converter (R-VSC) during voltage dips,an active crowbar protection is often set to by-pass the R-VSC for doubly-fed induction generator based wind turbine (DFIG-WT) to protect the whole system and implement low voltage ride through (LVRT).If the crowbar circuit put into operation lasts for a relatively long time (generally above 200 ms),DFIG over-speed-tripping-off from grid may happen.Based on the mathematical model of DFIG,the transient over-speed process of DFIG caused by the unbalance of wind generators’ rotor torques is analyzed.Then a novel LVRT scheme is presented consisting of an initiative cut-off criterion of Crowbar circuit and R-VSC restarting control strategy.At last,the new DFIG-LVRT scheme of restraining over-speed-tripping-off from grid is formed.The simulation system of DFIG-LVRT is established under PSCAD/EMTDC,and simulations are conducted to demonstrate the validity of the improved method.
严干贵, 侯延鹏, 王健, 王昱博. 抑制超速脱网的双馈感应风电机组低电压穿越控制策略研究[J]. 电工技术学报, 2015, 30(23): 146-154.
Yan Gangui, Hou Yanpeng, Wang Jian, Wang Yubo. A DFIG Wind Turbine Low-voltage Ride-through Control Strategy Restraining Over-speed-tripping-off from Grid. Transactions of China Electrotechnical Society, 2015, 30(23): 146-154.
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2015, Vol. 30 
