SWITSC的双馈发电机暂态特性及高电压穿越控制策略研究  

Study on Transient Characteristics and High Voltage Ride Through Control Strategy of Doubly Fed Induction Generator Based on SWITSC

作　　者：曾皓冬 李华强[1] 谢超[1] ZENG Haodong;LI Huaqiang;XIE Chao(Department of Electrical Engineering,Sichuan University,Chengdu 610000,Sichuan,China)

机构地区：[1]四川大学电气工程系,四川成都610000

出　　处：《电气传动》2021年第14期45-50,共6页Electric Drive

摘　　要：目前,常规双馈感应风力发电机(DFIG)的低电压穿越问题受到了广泛关注,但DFIG的高电压穿越(HVRT)问题研究甚少;且在发生定子绕组匝间短路(SWITSC)故障时,DFIG机组的HVRT问题鲜有研究。在分析SWITSC故障下的电磁特性和HVRT时的暂态特性基础上,提出一种撬棒电路和直流斩波电路相结合的HVRT控制策略。SWITSC故障的三相谐波恶化了电网电压骤升对转子侧电流和直流母线电压的影响,增加了HVRT的难度。转子侧撬棒电路和直流侧斩波电路显著提高了SWITSC故障机组的高电压穿越能力。仿真结果验证了理论分析的正确性。研究对掌握SWITSC的DFIG的动态过程具有一定的参考价值,为今后更好、更有效地研究风电机组的故障穿越提供了新的方向。At present,the problem of LVRT of conventional doubly-fed induction generator(DFIG)has been widely concerned,but the research on the problem of high voltage ride through(HVRT)of DFIG is very deficient,and in the case of stator winding inter-turn short circuit(SWITSC),there is little research on high voltage ride through(HVRT)of DFIG units.Based on the analysis of the electromagnetic characteristics and the transient characteristics under voltage swell,a HVRT control strategy combining Crowbar circuit and DC chopper circuit was proposed.The three-phase harmonics of SWITSC fault worsen the effect of voltage swell on rotor side current and DC bus voltage,and increase the difficulty of HVRT.Rotor side Crowbar circuit and DC side chopper circuit significantly improve the high voltage ride through capability of the SWITSC fault unit.The research has a certain reference value for mastering the dynamic process of DFIG of SWITSC,and provides a new direction for better and more effective study of wind turbine fault ride through in the future.

关 键 词：双馈感应发电机 定子绕组匝间短路 高电压穿越 暂态特性 撬棒 斩波电路 

分 类 号：TM614[电气工程—电力系统及自动化]