Pilot Protection Scheme of Submarine Cable in Flexible Low-Frequency Transmission System Based on Cross Entropy Algorithm
There are power electronic converters on both sides of the AC submarine line of flexible low-frequency transmission system, and the fault current characteristics are determined by the converter control strategy, which is different from the traditional synchronous power supply, which will lead to the...
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| Format: | Article |
| Language: | zho |
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State Grid Energy Research Institute
2023-11-01
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| Series: | Zhongguo dianli |
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| Online Access: | https://www.electricpower.com.cn/CN/10.11930/j.issn.1004-9649.202306023 |
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| author | Weixuan HE Zhengzhen FAN Yaotong HUO Yingyu LIANG |
| author_facet | Weixuan HE Zhengzhen FAN Yaotong HUO Yingyu LIANG |
| author_sort | Weixuan HE |
| collection | DOAJ |
| description | There are power electronic converters on both sides of the AC submarine line of flexible low-frequency transmission system, and the fault current characteristics are determined by the converter control strategy, which is different from the traditional synchronous power supply, which will lead to the risk of incorrect operation of the traditional current differential protection. Based on the fault current characteristics of offshore wind power transmission system cable line, this paper analyzes the operational performance of traditional current differential protection and reveals the reasons for the decline of operational performance. In this paper, a novel pilot protection scheme based on cross entropy algorithm is proposed. In this scheme, virtual negative capacitance compensation and negative number processing are carried out on the sampled current of one side, and then the cross entropy between the sampled current and the current of the other side is calculated. According to the change of cross entropy, external and internal faults are judged. The hardware in-loop test results show that the scheme can operate correctly when various types of faults occur in the submarine cable, and has strong resistance to high transition resistance. It can also operate correctly when there are measurement errors in TA. It can be used as a primary protection for flexible low-frequency transmission submarine. |
| format | Article |
| id | doaj-art-d35bfa5e44484d15901d8d81481ea8a5 |
| institution | DOAJ |
| issn | 1004-9649 |
| language | zho |
| publishDate | 2023-11-01 |
| publisher | State Grid Energy Research Institute |
| record_format | Article |
| series | Zhongguo dianli |
| spelling | doaj-art-d35bfa5e44484d15901d8d81481ea8a52025-08-20T02:58:50ZzhoState Grid Energy Research InstituteZhongguo dianli1004-96492023-11-015611384810.11930/j.issn.1004-9649.202306023zgdl-56-11-heweixuanPilot Protection Scheme of Submarine Cable in Flexible Low-Frequency Transmission System Based on Cross Entropy AlgorithmWeixuan HE0Zhengzhen FAN1Yaotong HUO2Yingyu LIANG3School of Mechanical Electronic and Information Engineering, China University of Mining and Technology (Beijing), Beijing 100083, ChinaJiaxun Feihong Intelligent Technology Institute, Beijing 100083, ChinaState Grid Changchun Power Supply Company, Changchun 130021, ChinaSchool of Mechanical Electronic and Information Engineering, China University of Mining and Technology (Beijing), Beijing 100083, ChinaThere are power electronic converters on both sides of the AC submarine line of flexible low-frequency transmission system, and the fault current characteristics are determined by the converter control strategy, which is different from the traditional synchronous power supply, which will lead to the risk of incorrect operation of the traditional current differential protection. Based on the fault current characteristics of offshore wind power transmission system cable line, this paper analyzes the operational performance of traditional current differential protection and reveals the reasons for the decline of operational performance. In this paper, a novel pilot protection scheme based on cross entropy algorithm is proposed. In this scheme, virtual negative capacitance compensation and negative number processing are carried out on the sampled current of one side, and then the cross entropy between the sampled current and the current of the other side is calculated. According to the change of cross entropy, external and internal faults are judged. The hardware in-loop test results show that the scheme can operate correctly when various types of faults occur in the submarine cable, and has strong resistance to high transition resistance. It can also operate correctly when there are measurement errors in TA. It can be used as a primary protection for flexible low-frequency transmission submarine.https://www.electricpower.com.cn/CN/10.11930/j.issn.1004-9649.202306023flexible low-frequency transmission systempilot protectionvirtual negative capacitancecross entropy algorithm |
| spellingShingle | Weixuan HE Zhengzhen FAN Yaotong HUO Yingyu LIANG Pilot Protection Scheme of Submarine Cable in Flexible Low-Frequency Transmission System Based on Cross Entropy Algorithm Zhongguo dianli flexible low-frequency transmission system pilot protection virtual negative capacitance cross entropy algorithm |
| title | Pilot Protection Scheme of Submarine Cable in Flexible Low-Frequency Transmission System Based on Cross Entropy Algorithm |
| title_full | Pilot Protection Scheme of Submarine Cable in Flexible Low-Frequency Transmission System Based on Cross Entropy Algorithm |
| title_fullStr | Pilot Protection Scheme of Submarine Cable in Flexible Low-Frequency Transmission System Based on Cross Entropy Algorithm |
| title_full_unstemmed | Pilot Protection Scheme of Submarine Cable in Flexible Low-Frequency Transmission System Based on Cross Entropy Algorithm |
| title_short | Pilot Protection Scheme of Submarine Cable in Flexible Low-Frequency Transmission System Based on Cross Entropy Algorithm |
| title_sort | pilot protection scheme of submarine cable in flexible low frequency transmission system based on cross entropy algorithm |
| topic | flexible low-frequency transmission system pilot protection virtual negative capacitance cross entropy algorithm |
| url | https://www.electricpower.com.cn/CN/10.11930/j.issn.1004-9649.202306023 |
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