双馈感应风力发电机实现LVRT控制策略研究

根据最新的风电场接入电网规定,在电网发生故障情况下风力发电机组应能保持与电网的连接。电网电压跌落是电网故障常见的形式之一,所以如何提高双馈感应风力发电机组低电压穿越能力成为了当今风电技术的研究热点。本文根据低电压穿越技术的基本原则,通过改进转子侧的控制策略和增加保护电路的方案来实现低电压穿越技术。通过仿真研究表明,改进的控制策略可以有效的抑制转子侧过电流,能够有效的提高双馈感应风力发电机在故障期间的低电压穿越能力。

The control strategy research of doubly fed induction wind generator to achieve LVRT

According to the latest Wind Power provides, in the case of power failure wind turbines should be able to maintain a connection to the grid. Voltage drop is one of common forms of fault, so how to improve capacity of the low-voltage ride through （LVRT） in doubly-fed induction generator （DFIG） becomes a hot spot on current wind power technology research. ON basis of fundamental principle of LVRT, by improving the rotor side conlrol strategy t, this dissertation makes the fulfillment of the LVRT. The simulation results show that, improved control strategy can not only effectively restrain the rotor current Ceguo, but effectively improve capacity of the LVRT in DFIG during the fault.