基于主动阻尼器的双馈式风力发电机组故障穿越控制策略

FAULT RIDE-THROUGH CONTROL STRATEGY FOR DOUBLY-FED INDUCTION GENERATOR BASED ON ACTIVE DAMPER

针对双馈式风力发电机组的故障穿越控制策略问题,分析电网对称故障时其转子电压和电流的瞬态特性,找出引起转子过电压和过电流的原因。在不增加励磁系统硬件的条件下,通过改进控制方法在转子中形成一个主动阻尼电阻,有效地限制由定子磁链直流分量引起的转子过电流。以2MW双馈式风力发电机组为例,对所提出的故障穿越控制策略进行仿真研究。仿真结果说明所提出的故障穿越控制策略的可行性和有效性,可提高双馈式风力发电机机组的故障穿越能力。

Aiming at the fault fide-through control strategy for doubly-fed induction generator, the transient characteristics of rotor voltage and current during the grid symmetric fault were analyzed; the causes of overvoltage and overcurrent in the rotor windings were obtained. Without increasing excitation system hardware, an active damping resistor in the rotor was introduced by means of improving the control method, the rotor overeurrent produced by the transient DC component of the stator flux linkages was effectively restrained. With 2MW doubly-fed induction generator as an example, the proposed fault fide-through control strategy was studied by the simulation, which validated the feasibility and effectiveness of the proposed fault fide-through control strategy, and it improved the fault fide-through capability of the doubly-fed induction generator.