双馈风电场对电力系统阻尼影响的转矩分析

Torque Analysis for the Influence of DFIG-Based Wind Farm on Damping of Power System

为了研究双馈感应发电机(DFIG)对电力系统阻尼的影响,提出了广义元件的频率-功率动态特性的概念。在此基础上,证明了用于判别广义元件阻尼性质和大小的两个命题。广义元件对电力系统阻尼影响的性质取决于频率-功率动态特性的相位,阻尼大小决定于其幅值。双馈感应发电机(DFIG)属于该广义元件的一种,可依据所提的定义和命题,分析DFIG对电力系统阻尼的影响。算例分析表明,调节器参数对DFIG的频率-功率动态特性的相位和幅值都有显著影响,造成不同调节参数下的双馈感应发电机(DFIG)有明显不同的阻尼特性。仿真分析进一步证实了文中定义和命题的实用性和有效性。

In order to investigate the influence of doubly fed induction generator（DFIG） on power system damping,the conception of frequency-power dynamic characteristic for generic component is presented in this paper.Based on the proposed conception,two propositions are proved to be available for examining the damping of generic component.The phase of frequency-power dynamic characteristic of generic component can tell whether the damping performance is positive or not,and its magnitude can tell how strong the damping is.Because the DFIG is one of the generic components,the proposed definitions and propositions in this paper are useful for analyzing the impact of DFIG on power systems.Through a simulation case,both frequency-power dynamic characteristic and influence of damping contribution are analyzed under different regulator parameters of DFIG.So,the practicability of the proposed definitions and propositions is further validated.