DFIG 并网对电网低频振荡特性的影响研究

摘要

The increasing of installed capacity of wind power has a more significant impact on the operation of power systems.Therefore, the influences of the wind power on the low-frequency oscillations of power systems have become an important issue concern to insure the stable operation of power gird .This paper sets up a complete three-machine nine-bus power system model , and uses the improved FastICA and Prony algorithms to research the influence of the doubly fed induction generator ( DFIG) on the low-frequency oscillation in power system .The results show that the ac-cess of DFIG introduces a new mode of low-frequency oscillation .In addition , the damping characteristic of the oscil-lation mode vary from the DFIG ’ s increasing access capacity to different access positions .%风电装机容量的增长使其对电力系统的影响更加明显，因此研究风电并网对电力系统低频振荡特性的影响，对确保电网的稳定运行具有重要意义。文中建立了完整的3机9节点电力系统模型，运用改进FastICA与Prony算法相结合的方法研究双馈风电机组并网对电力系统低频振荡特性的影响。分析结果表明，风电机组的接入为系统引入一个新的低频振荡模式，并且随着风电机组接入容量与接入位置的不同，振荡模式的阻尼特性也随之发生变化。