基于电流主动补偿和RSC被动保护的双馈风力发电机组故障穿越控制策略

Fault Ride Through Control Strategy of DFIG based on Current Active Compensation and RSC Passive Protection

针对双馈感应发电机(DFIG)在故障穿越中存在的定转子侧过电流、直流母线过电压、电磁转矩和定子输出功率波动、转子侧变流器(RSC)遭受电流冲击等问题,本文在分析转子侧感应电动势的基础上,提出了电流主动补偿控制策略和RSC被动保护控制策略;两种控制策略分别通过将定子电流主动补偿为转子电流参考值和在转子回路串联动态电流阻抗器(DCR),来解决双馈风机在故障穿越中所存在的问题。所提控制策略提高了双馈感应发电机的故障穿越运行能力。最后,通过仿真验证了所提控制策略的有效性及可行性。

Aiming at the problems existing, in doubly fed induction generator over current at rotor and stator side, DC link overvoltage, electromagnetic torque, stator output power fluctuation and rotor-side converter subjected to current impulse during the ride through of the generator. Based on the analysis of rotor electromotive force, a current active compensation control strategy and the RSC passive protection control strategy are proposed. The two control strategies are designed to solve the problems of doubly fed induction generator and the series of dynamic current resistance(DCR) in the rotor loop. The proposed control strategies improve the fault traversing capability of doubly fed induction generators. Finally, the validity and feasibility of the proposed control strategy are verified by simulation.