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| Strategy of conversion between ground return and metallic return in multi-terminal high voltage direct current transmission system |
| ZHAO Qian, ZHANG Qun |
| XJ Electric Co., Ltd, Xuchang, He’nan 461000 |
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Abstract In view of the problem that the metallic return transfer break (MRTB) protection acts in the process of ground-metallic return conversion at different power levels in the first conventional multi-terminal high voltage DC transmission system in China, which leads to switch rejection and ground-metallic return conversion failure, this paper analyzes the current loop in the process of ground-metallic return conversion. The mathematical expressions of each converter station current are deduced when earth and metal loop coexist. On the basis of these expressions, the reason of MRTB operation failure is obtained and the improvement strategies and operation suggestions are proposed to provide a reference for engineering design and operation maintenance. Finally, the correctness of the analysis conclusion is verified by the simulation, which shows that the proposed strategies has the engineering application promotion value.
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Received: 28 October 2023
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| Cite this article: |
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ZHAO Qian,ZHANG Qun. Strategy of conversion between ground return and metallic return in multi-terminal high voltage direct current transmission system[J]. Electrical Engineering, 2024, 25(3): 74-78.
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| URL: |
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http://dqjs.cesmedia.cn/EN/Y2024/V25/I3/74
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[1] 汤广福, 罗湘, 魏晓光. 多端直流输电与直流电网技术[J]. 中国电机工程学报, 2013, 33(10): 8-17, 24.
[2] 龙磊. 特高压混合多端直流系统故障退站后处置方法研究[J]. 电气技术, 2023, 24(3): 44-51.
[3] 韩丰收, 肖一鹏, 郑炯光, 等. 禄高肇三端直流工程第三站在线投入特性分析[J]. 电气技术, 2022, 23(8): 53-56.
[4] 张浩然, 贾帅锋, 饶国辉, 等. 云-贵互联通道工程三端站间通信方案[J]. 电气技术, 2020, 21(9): 118-121.
[5] 彭忠, 魏金科, 赵静, 等. 并联型多端直流输电系统运行方式研究[J]. 电力系统保护与控制, 2019, 47(16): 180-187.
[6] 李岩, 罗雨, 许树楷, 等. 柔性直流输电技术: 应用、进步与期望[J]. 南方电网技术, 2015, 9(1): 7-13.
[7] 陈凌云, 程改红, 邵冲, 等. LCC-MMC型三端混合直流输电系统控制策略研究[J]. 高压电器, 2018, 54(7): 146-152.
[8] 胡宇洋, 余珊珊. 葛南直流大地—金属回线转换实例分析[J]. 电力系统自动化, 2017, 41(23): 150-155.
[9] 严宇, 朱伟江, 刘皓, 等. 葛南直流输电系统中大地回线和金属回线转换的研究[J]. 电网技术, 2005, 29(21): 5-8.
[10] 林少伯, 王明新, 王华伟, 等. 宁东直流大地回线转金属回线转换失败原因分析与改进建议[J]. 电力系统保护与控制, 2015, 43(24): 129-134.
[11] 李晓霞, 胡付有, 石万里, 等. 多端直流大地回线和金属回线转换过程分析及策略研究[J]. 电工技术, 2020(7): 48-52.
[12] 冯鸫, 宋天奇, 杨洁民, 等. 直流输电工程大地回线和金属回线转换过程及运行实例分析[J]. 高压电器, 2009, 45(2): 126-129.
[13] 代书龙, 张锐. 牛从直流方式转换时中性母线过电压抑制[J]. 电气自动化, 2020, 42(5): 69-71. |
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2024, Vol. 25 
