摘要
为增强双馈风力发电系统(DFIG)的动态响应速度,设计了滑模电流控制器。分析了DFIG能量流动关系,并从抑制能量向转子侧流动的角度考虑,提出了电网故障时刻转子侧变流器的改进控制策略。对所提改进控制策略进行了对比仿真分析。结果表明,该方法能有效地抑制转子侧过电流和电磁转矩振荡,动态性能好,提高了DFIG的低电压穿越能力。
The SMC current controller to alter the dynamics of doubly-fed induction generator( DFIG) was designed. The flow of energy inner the DFIG was discussed. Then a low voltage ride-through( LVRT) control strategy was modified to suppress the energy flowing to the rotor circuit. The simulation was carried out to verify the effectiveness on restrain the rotor over current and the oscillations of electromagnetic torque. The simulation results demonstrated that the modified control strategy could improve the LVRT capability.
出处
《电机与控制应用》
北大核心
2016年第3期54-58,73,共6页
Electric machines & control application
基金
河北省自然科学基金(E2012502018)
教育部中央高校基本科研业务费专项资金项目(2014MS95)
关键词
双馈风力发电机
低电压穿越
滑模控制
能量流动
doubly-fed induction generator(DFIG)
low voltage ride through(LVRT)
sliding-mode control(SMC)
energy flow