Influence of MMC-HVDC on current phase differential protection of AC line

被引：0
|
作者：
Liang Y. [1 ]
Li W. [1 ]
Lu Z. [1 ]
Zhao F. [1 ]
Zha W. [1 ]
机构：
[1] School of Mechanical Electronic and Information Engineering, China University of Mining and Technology(Beijing), Beijing
来源：
Dianli Zidonghua Shebei/Electric Power Automation Equipment | 2019年 / 39卷 / 09期
基金：
中央高校基本科研业务费专项资金资助; 中国国家自然科学基金;
关键词：
Adap-tability analysis; Current phase differential protection; Fault characteristic; HVDC power transmission; Modular multilevel converter;
D O I：
10.16081/j.epae.201909033
中图分类号：
学科分类号：
摘要：
MMC-HVDC(Modular Multilevel Converter based High Voltage Direct Current) is highly controllable and its fault current characteristics are quite different from that of traditional synchronous power supply, which may affect the performance of current phase differential protection. The current expressions of the fault line at both converter station side and grid side are derived, and the fault current characteristics are deeply analyzed. On this basis, the analytical expressions of current phase angle difference between the two sides of fault line are derived under the conditions of single-phase grounding fault and phase-to-phase short circuit fault. The influence of fault type, voltage unbalance degree and power reference value on current phase angle difference of fault line is analyzed. And then the influence mechanism of MMC-HVDC on the performance of current phase differential protection is pointed out. The simulation model is built in PSCAD/EMTDC and the simulative results verify the correctness of the theoretical analysis. © 2019, Electric Power Automation Equipment Press. All right reserved.
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页码：95 / 101
页数：6
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