High Frequency Impedance Modeling and Oscillation Analysis of DFIG-based Station Considering SVG

被引：0
|
作者：
Xiong X. [1 ]
Luo B. [1 ]
Liu J. [2 ]
Zhang Y. [2 ]
Wu Y. [2 ]
Guo C. [1 ]
机构：
[1] State Key Laboratory for Alternate Electrical Power System With Renewable Energy Sources, North China Electric Power University, Changping District, Beijing
[2] North China Electric Power Research Institute Co., Ltd., State Grid Jibei Electric Power Co., Ltd. Research Institute, Haidian District, Beijing
来源：
Dianwang Jishu/Power System Technology | 2023年 / 47卷 / 07期
关键词：
DFIG; high frequency oscillation; impedance reshaping; small signal stability; SVG;
D O I：
10.13335/j.1000-3673.pst.2022.0511
中图分类号：
学科分类号：
摘要：
Doubly-fed induction generators (DFIG) connected to the static var generator (SVG) is prone to high-frequency oscillation due to their interactions, which greatly threatens the stable operation of the doubly fed wind farm. To solve this problem, this paper establishes the high-frequency impedance models for the SVG, the DFIG and the cables respectively. The theoretical impedance model is verified by frequency scanning through the MATLAB/Simulink simulation platform. Through analysis, it is found that after the DFIG is connected with the cables, the high-frequency impedance becomes capacitive, and the high frequency impedance of the SVG shows the characteristic of negative resistance and inductance. Therefore, after the doubly-fed wind farm is connected to the SVG, the high frequency resonance peak occurs, causing high frequency oscillation instability. At the same time, based on the high frequency impedance model, the key factors affecting the high frequency stability of the system after connecting the SVG are studied. It is found that the delay and the proportional gain of the current loop of the SVG and the DFIG grid side converter are the main factors for the high frequency oscillation of the wind farm. Aiming at the cause of oscillation, this paper further proposes a SVG impedance reshaping method based on the voltage feedforward in the synchronous rotating frame in order to improve the stability of the wind farm. Finally, the electromagnetic transient simulation model of the doubly-fed wind farm is established in the MATLAB/Simulink. With the parameters of actual cases the correctness of theoretical analysis and the effectiveness of proposed method is verified. © 2023 Power System Technology Press. All rights reserved.
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页码：2905 / 2915
页数：10
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