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

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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.

Key words： Doubly-fed induction generator low voltage ride through active crowbar protection over-speed-tripping-off from grid

Received: 30 May 2015 Published: 18 December 2015

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TM315

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	Yan Gangui
	Hou Yanpeng
	Wang Jian
	Wang Yubo

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Yan Gangui,Hou Yanpeng,Wang Jian等. A DFIG Wind Turbine Low-voltage Ride-through Control Strategy Restraining Over-speed-tripping-off from Grid[J]. Transactions of China Electrotechnical Society, 2015, 30(23): 146-154.

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https://dgjsxb.ces-transaction.com/EN/ OR https://dgjsxb.ces-transaction.com/EN/Y2015/V30/I23/146

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