应对电网电压骤降的双馈感应风力发电机Crowbar控制策略Crowbar Control Strategy for Doubly Fed Induction Generator of Wind Farm During Power Grid Voltage Dips
蒋雪冬;赵舫;
摘要(Abstract):
双馈感应发电机(doubly fed induction generator,DFIG)具有有功、无功功率独立调节的能力及励磁变频器所需容量小等优点,在风力发电系统中得到了广泛应用,但由于励磁变频器的容量较小,使其在电网故障下的控制能力受到限制。为保护励磁变频器,需要采用Crowbar装置在电压骤降时为转子浪涌电流提供通路,并限制转子电流增大。文章提出了一种Crowbar控制策略,能有效抑制转子过电流、直流母线过电压以及电磁转矩的振荡,并可向电网注入无功电流以帮助电网电压的恢复。仿真结果验证了这种控制方式能使DFIG在大幅电压骤降故障下实现不间断运行,有效提高了DFIG风电机组运行的可靠性。
关键词(KeyWords): 变速恒频;双馈感应发电机;电压骤降;Crowbar电路;不间断运行
基金项目(Foundation):
作者(Author): 蒋雪冬;赵舫;
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DOI:
参考文献(References):
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