针对双馈(DFIG)风电系统在非理想电网条件下的运行特性，研究了电网谐波对DFIG输出特性的影响。定量分析了典型谐波作用时，DFIG输出功率和电磁转矩的脉动量的大小及与基波相比所占的比例。基于此，以消除电网谐波对 DFIG 风电系统输出特性的影响为目标，对理想电网条件下的比例谐振(PR)控制策略进行了改进与完善，提出了一种非理想电网条件下的PR控制策略。为验证该控制策略的正确性，对一台1.5 MW风电系统进行了仿真研究，结果表明所提出的控制策略能够显著消除由电网谐波引起的DFIG风电系统输出功率及转矩的脉动。%Based on the operation characteristics of doubly-fed wind generation system under non-ideal grid voltage conditions, this paper studies the influence of the grid harmonic on the doubly-fed induction generation’s output characteristics. It also analyses the different consequences of the DFIG output power and electromagnetic torque under typical harmonic conditions. On this basis, the PR control strategy under ideal grid voltage conditions is improved and completed, and a PR control strategy is proposed which targets to eliminate the effects of harmonic on the output characteristics of DFIG wind generation system. In order to verify the correctness of the control strategy, simulation studies on a 1.5 MW doubly-fed wind generation system prove that the improved control strategy can efficiently smooth the instantaneous output power fluctuation and electromagnetic torque pulsation.
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