Voltage sag judgment method considering influence of phase angle on amplitude characteristics during sag

被引：0
|
作者：
Liu Y. [1 ]
Wu X. [1 ,2 ]
Liu J. [1 ]
Li X. [3 ]
Zhu G. [3 ]
机构：
[1] National Active Distribution Network Technology Research Center (NANTEC), Beijing Jiaotong University, Beijing
[2] Collaborative Innovation Center of Electric Vehicles in Beijing, Beijing
[3] Beijing Xinghang Mechanical and Electrical Equipment Co., Ltd., Beijing
来源：
Dianli Zidonghua Shebei/Electric Power Automation Equipment | 2021年 / 41卷 / 03期
关键词：
Change trend prediction; Detection; Small angle delay; Voltage characteristics; Voltage sag;
D O I：
10.16081/j.epae.202102018
中图分类号：
学科分类号：
摘要：
The key to realize voltage sag compensation is to judge the occurrence of sag events quickly and accurately. The problems of existing small angle delay detection method are analyzed, and an improved voltage sag judgment method is proposed. Based on the construction of αβ coordinate system with small angle delay, the voltage characteristics of dq coordinate system at the time of sag are analyzed, and the expression of d axis component with amplitude information is derived. By predicting the change trend and magnitude of d axis component at the time of sag, the voltage sag can be quickly determined. The proposed method can overcome the influence of amplitude fluctuation in small angle delay detection method, improve the detec-tion speed, and is conducive to the follow-up compensation effect. Simulative results verify that the proposed method can effectively improve the real-time performance and accuracy of detection. © 2021, Electric Power Automation Equipment Press. All right reserved.
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页码：122 / 128
页数：6
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