CAJ | 학술논문

双馈感应风力发电机组（doubly fed induction generator，DFIG）对电网扰动十分灵敏，在电网发生故障期间双馈风电机组与电网的相互影响会造成电网暂态特性以及短路电流分布的显著变化。但是由于双馈感应发电机组与同步发电机组的结构及运行原理均不相同，且目前对其故障过程的研究也比较有限，使得并网双馈风电机组的故障特性还不甚清晰。在以双馈风电机组为主的风电大规模并网背景下，电网的安全稳定运行面临着严峻的挑战。从双馈风电机组的控制策略对其故障特性的影响机制出发，对双馈风电机组在电网发生对称以及不对称短路情况下的短路过程进行深入分析，并进一步推导了适用于不同电网短路情况的并网双馈风电机组短路电流表达式，仿真和算例结果验证了该表达式的正确性。
쌍궤감응풍력발전궤조（doubly fed induction generator，DFIG）대전망우동십분령민，재전망발생고장기간쌍궤풍전궤조여전망적상호영향회조성전망잠태특성이급단로전류분포적현저변화。단시유우쌍궤감응발전궤조여동보발전궤조적결구급운행원리균불상동，차목전대기고장과정적연구야비교유한，사득병망쌍궤풍전궤조적고장특성환불심청석。재이쌍궤풍전궤조위주적풍전대규모병망배경하，전망적안전은정운행면림착엄준적도전。종쌍궤풍전궤조적공제책략대기고장특성적영향궤제출발，대쌍궤풍전궤조재전망발생대칭이급불대칭단로정황하적단로과정진행심입분석，병진일보추도료괄용우불동전망단로정황적병망쌍궤풍전궤조단로전류표체식，방진화산례결과험증료해표체식적정학성。
Doubly fed induction generators （DFIGs） are very sensitive to the disturbances of grid, so the transient characteristics and short-circuit current of grid will be dramatically changed by the interaction between the generation and grid under fault condition. However, the fault characteristics of the DFIG is not clear, because the structure and operating principle is very different from that of the traditional synchronous generator, and the researches about its fault behavior is relatively limited. In the background of the interconnection of large-scale wind generation, the security and stability of whole power system will be challenged. In this paper, the influencing mechanism of the control system on short-circuit behavior was firstly discussed. Then the short-circuit behavior under symmetrical and asymmetrical short circuit were further researched. Finally, the expressions of short circuit current for DFIG under different fault conditions were proposed. The effectiveness of the expression was proved by simulation and calculation example.