CAJ | 학술논문

双馈感应发电机(double fed induction generator，DFIG)作为当前应用最广泛的风力发电机，其特殊的结构设计使其暂态运行特性十分复杂。目前针对DFIG暂态特性的研究，只有少量文章分析了机组的谐波特性，特别是由转子励磁电源产生的机组谐波电流还鲜有文献提及。该文对电压不对称跌落下DFIG转子低频谐波电流的特性进行研究。考虑转子侧变流器的励磁调节对转子谐波的影响，推导转子电流中频率为(2+s) fs的谐波分量解析表达式，分析转子(2+s) fs电流分量的产生机理及其对风机影响，并通过仿真和实验验证分析的正确性。
쌍궤감응발전궤(double fed induction generator，DFIG)작위당전응용최엄범적풍력발전궤，기특수적결구설계사기잠태운행특성십분복잡。목전침대DFIG잠태특성적연구，지유소량문장분석료궤조적해파특성，특별시유전자려자전원산생적궤조해파전류환선유문헌제급。해문대전압불대칭질락하DFIG전자저빈해파전류적특성진행연구。고필전자측변류기적려자조절대전자해파적영향，추도전자전류중빈솔위(2+s) fs적해파분량해석표체식，분석전자(2+s) fs전류분량적산생궤리급기대풍궤영향，병통과방진화실험험증분석적정학성。
The double fed induction generator (DFIG) is the most widely used wind generator. Because of its special structure design, the transient characteristics of DFIG are much complicated. At present only a small amount of papers discuss about the harmonic characteristics, which belong to the transient characteristics analysis of DFIG. Specifically, there are few papers analyzing the rotor harmonic current caused by the rotor excitation source. This paper researches on rotor harmonic currents with the frequencies of (2+s) time fundamental frequency. Considering the excitation regulation by the rotor-side converter, its detailed analytical expression is derived and the generation mechanism and influence to the generator is analyzed. Finally the conclusion was tested by simulations and experiments.