并网型双馈发电机励磁控制技术研究

根据双馈发电机的数学模型,采用空间矢量的分析方法,对系统耦合量的处理方式进行了详细分析。在定子磁场定向控制策略的基础上,针对并网型双馈发电机系统的不同控制模式建立了相应的励磁控制模型,并分析了两种控制模式的异同。实验结果与理论分析均表明,带反电势前馈补偿的系统耦合量处理方式能够有效抑制电网电压的波动,并提高整个系统的动态响应性能。而且,无论系统采用功率控制模式还是速度控制模式,均能实现双馈发电机定子端口有功功率或转速和无功功率之间的解耦控制,但无法同时实现三者之间的独立控制。

EXCITATION CONTROL FOR GRID-CONNECTED DOUBLY FED GENERATOR

According to the mathematical model of doubly-fed induction generator (DFIG),the detailed analysis of how to deal with coupled system variables by space vector control methods was presented.Based on stator-flux orientation control strategy,two excitation control models aiming at different control modes of grid-connected doubly-fed induction generator system were formed.An analysis of the difference between the two control modes is also showed.Experimental results and theoretical analysis all prove that this method of dealing with system coupled variables with back electromotive force feed- forward compensation could effectively suppress the grid voltage fluctuation and enhance the dynamic response perfor- mance of the whole system.The power control mode can achieve the active and reactive power decoupled control,while speed control mode can do the active power and the speed decoupled control,but the separately synchronous control among the three is unable to attain.