CAJ | 학술논문

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。
침대쌍궤(DFIG)풍전계통재비이상전망조건하적운행특성，연구료전망해파대DFIG수출특성적영향。정량분석료전형해파작용시，DFIG수출공솔화전자전구적맥동량적대소급여기파상비소점적비례。기우차，이소제전망해파대 DFIG 풍전계통수출특성적영향위목표，대이상전망조건하적비례해진(PR)공제책략진행료개진여완선，제출료일충비이상전망조건하적PR공제책략。위험증해공제책략적정학성，대일태1.5 MW풍전계통진행료방진연구，결과표명소제출적공제책략능구현저소제유전망해파인기적DFIG풍전계통수출공솔급전구적맥동。
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.