电网电压不平衡度对DFIG运行特性的影响

分析了电网电压不平衡理论以及常见的电压不平衡情况,推导了电网电压不平衡时双馈感应发电机(doubly-fed induction generator,DFIG)的输出功率,研究了电网电压不平衡时双馈感应发电机的运行特性。在Matlab/Simulink中搭建DFIG并网模型,进一步仿真研究了电网电压不平衡情况下DFIG的运行特性。研究表明,随着不平衡度的增加,风机输出有功功率和无功功率、定子侧有功功率和无功功率、转子侧有功功率和无功功率的脉动幅值近似线性增大。在同一不平衡度下,有功功率的脉动幅值高于无功功率的脉动幅值。

The influence of the unbalanced grid voltage to operational characteristics of Doubly Fed Induction Generator

Based on the analysis of the unbalanced grid voltage theory and common presentation of voltage unbalance , the out-put power of doubly fed induction generator (DIFG) is deduced, and the operating characteristics of DFIG is studied during unbalanced grid voltage .For the further research on the operating characteristics of DFIG , and the con-nection grid model of the DFIG is built in Matlab/Simulink .Results have shown that , with the increasing degree of the unbalance , the output pulsation amplitude of active and reactive of the DFIG and stator-side and rotor-side, in-crease almost linearly .In the same unbalance degree , active pulsation amplitude is higher than the reactive power pulsation amplitude .