摘要
为了提高电网电压严重骤降故障下双馈发电机低压穿越性能,研究了新型永磁双馈发电机的低电压穿越控制策略。对新型永磁双馈风力发电机结构及电磁关系进行了分析,建立了永磁双馈发电机系统的动态数学模型,针对永磁双馈发电机在电网电压严重跌落时,提出了计及定子励磁电流变化的永磁双馈发电机零转矩控制策略,分别采用传统Crowbar控制和计及定子励磁电流变化的零转矩控制策略进行了对比仿真。仿真结果表明,计及定子励磁电流变化的零转矩控制策略能够改善永磁双馈发电机低压穿越运行能力。
A new control strategy for rotor-side converter of a novel permanent magnet doubly-fed induction generator(PMDFIG) is discussed. The new control strategy can enhance the low voltage ride-through(LVRT) capability. By the analysis of structure and electromagnetic relations, the mathematical model of PMDFIG based on the rotating coordinate system is established. The zero torque control scheme considering stator excitation current change is introduced when low voltage occurs due to grid fault. The effectiveness of the proposed control strategy is demonstrated by two simulation cases. Compared with the conventional crowbar protection, the proposed control method can effectively improve the LVRT capability of the PMDFIG during the grid serious faults.
出处
《电工技术学报》
EI
CSCD
北大核心
2014年第7期173-180,共8页
Transactions of China Electrotechnical Society
基金
国家自然科学基金资助项目(51177089)
关键词
风力发电
永磁双馈发电机
零转矩控制
Crowbar控制
低电压穿越
Wind power generation,permanent magnetic doubly fed induction generator(PMDFIG),zero torque control,Crowbar control,low voltage ride-through
