双馈发电机空、轻载下的能量自平衡问题

Energy Self-balance of Doubly-fed Generator Under No Load or Light Load Condition

无刷双馈发电机工作在自然同步转速以上(即超同步运行),特别是在空载和轻载时,如果控制不当,回馈器的回馈电流会流向功率绕组,尖峰回馈电流会产生尖峰转矩,造成速度波动,引起整个发电系统的振荡。文章对这种高速运行的特性进行了分析,得出了能量自平衡是无刷双馈发电机稳定运行关键的结论。

When brushless doubly-fed generators worked above the natural synchronous speed （i.e., super synchronous operation）, especially under No load and light load condition, the feedback current from the feeder would flow to the power winding, besides while the peak re-generative current would produce a peak torque, resulting in the speed fluctuation and entire power system oscillation further. Then, the characteristic of the brushless doubly-fed generator at high speed under the noload or light load was analyzed and came to the conclusion that the self energy balance was the key means to guarantee the stable operation of a brushless doublyfed generator.