Mechanism analysis of the impact of DC system on power-frequency variation protections

被引：0
|
作者：
Cai D. [1 ]
Li H. [1 ]
Zhu X. [1 ]
Wang G. [1 ]
机构：
[1] School of Electric Power, South China University of Technology, Guangzhou
来源：
Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control | 2019年 / 47卷 / 09期
基金：
中国国家自然科学基金;
关键词：
Directional element; Distance element; Fault characteristics of DC system; Mechanism analysis; Power-frequency variation;
D O I：
10.7667/PSPC180583
中图分类号：
学科分类号：
摘要：
In order to analyze the operating characteristics of power-frequency variation protections of the sending-end AC system theoretically, the mathematical model of DC system at the rectifier side which is represented by a power-frequency variation impedance in fault superimposed network is deduced in the case that fault occurs in the sending-end AC system. Based on the mathematical model and the response characteristics of HVDC control system, the characteristics of the equivalent power-frequency variation impedance of DC system are analyzed under different fault conditions. Then the impact of DC system on power-frequency variation protections is analyzed based on the fault characteristics of DC system. According to the analysis, when fault occurs in the sending-end AC system, the equivalent power-frequency variation impedance of DC system is capacitive under most fault conditions, which reduces the zone of distance protection based on power-frequency variation and results in misjudgment of directional protection based on power-frequency variation. In the end, the result is verified by simulations on PSCAD/EMTDC. © 2019, Power System Protection and Control Press. All right reserved.
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页码：1 / 9
页数：8
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