【摘要】 针对在电网不平衡电压情况下,双馈电机(DFIG)的定子侧有功功率、无功功率以及电磁转矩均出现2次脉动量,提出了一种双同步旋转坐标系(SRF)控制策略,通过对其转子侧电压和电流量进行控制,产生相应的转子电压和电流量,从而实现其不平衡控制目标。运用EMTP-RV仿真软件搭建仿真模型,通过仿真分析对比DFIG在常规定子电压定向矢量控制和考虑电网电压不平衡的DFIG双SRF控制,验证了DFIG的双SRF控制策略可以有效抑制电网电压不平衡情况下引起的电磁转矩、无功功率和总机械功率的2次脉动,实现DFIG的稳定运行。更多还原

【Abstract】 Under unbalanced grid voltage,the active power,reactive power and electromagnetic torque at DFIG stator side may appear the second-order components.A double SRF(Synchronous Rotating Frame) control strategy is proposed,which produces the corresponding voltage and current of DFIG rotor to realize the unbalanced control.A simulation model of DFIG is established with EMTP-RV software and the comparison of simulative results between the conventional stator voltage oriented vector control and the double SRF DFIG control under unbalanced grid voltage proves that,the latter effectively eliminates the second-order components of electromagnetic torque,reactive power and total mechanical power under unbalanced grid voltage to realize the stable operation of DFIG.更多还原