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双脉宽调制(PWM)控制的交—直—交电压型变频器适于用做交流励磁发电机的励磁电源,但交流励磁发电机运行状态的改变会引起双PWM交—直—交变频器直流链电压的波动,不利于整个发电系统的稳定运行。文中结合交流励磁发电机的运行特点,深入分析了直流链电压波动的原因,提出了基于转子侧变换器瞬时功率反馈控制的双PWM控制策略。实验结果验证了所提出的改进控制策略的正确性,该方法可有效维持发电机运行状态突变时直流链电压的稳定,大大增强了发电机系统的动态响应能力和稳定性。
Dual pulse width modulation (PWM) control of AC - DC - AC voltage inverter is suitable for use as AC excitation generator excitation power supply, but the change of AC excitation generator operating conditions can cause dual PWM AC - DC - AC-DC converter DC link voltage fluctuations, is not conducive to the stable operation of the entire power generation system. In this paper, the causes of DC link voltage fluctuation are analyzed deeply according to the operation characteristics of AC excitation generator. A double PWM control strategy based on instantaneous power feedback control of rotor side converter is proposed. The experimental results verify the correctness of the proposed improved control strategy. This method can effectively maintain the stability of the DC link voltage when the generator operating condition suddenly changes and greatly enhance the dynamic response capability and stability of the generator system.