Overvoltage Characteristics of Flexible HVDC Submarine Cables Based on Modular Multilevel Converter

DENG Heming; CAI Wei; ZHANG Guangzhou; ZHENG Xinlong; HE Jinhai; YANG Liming

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Overvoltage Characteristics of Flexible HVDC Submarine Cables Based on Modular Multilevel Converter

更新时间：2025-12-08

- Overvoltage Characteristics of Flexible HVDC Submarine Cables Based on Modular Multilevel Converter
- Vol. 42, Issue 6, Pages: 1848-1854(2016)
- 作者机构：
  
  1. 国网电力科学研究院
  2. 国网舟山供电公司
  3. 国网黄石供电公司
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Published Online：30 June 2016，
  
  Published：2016
- 稿件说明：
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DENG Heming, CAI Wei, ZHANG Guangzhou, et al. Overvoltage Characteristics of Flexible HVDC Submarine Cables Based on Modular Multilevel Converter[J]. 2016, 42(6): 1848-1854.
DOI：

DENG Heming, CAI Wei, ZHANG Guangzhou, et al. Overvoltage Characteristics of Flexible HVDC Submarine Cables Based on Modular Multilevel Converter[J]. 2016, 42(6): 1848-1854. DOI：

摘要

作为柔性直流输电工程的连接单元

直流海底电缆的绝缘水平关系着输电工程的安全运行。以舟山多端柔性直流输电工程中定海换流站至岱山换流站的海底柔性直流电缆为研究对象

采用统计法仿真计算了模块化多电平换流器型柔性直流输电海缆过电压分布规律

得出柔性直流海缆的绝缘水平。通过仿真计算

得出了直流电缆的故障过电压最大值

即导体对铅套、铅套对铠装和铠装对地的最大过电压分别为403.44 k V、6.72 k V和0.39k V;选取30%的绝缘裕度

确定了直流电缆的绝缘水平

即导体对铅套为525 k V、铅套对铠装为9 k V和铠装对地为0.6 k V。计算结果可为柔性直流电缆的选型及试验提供重要参考。

Abstract

As the connection unit of the flexible HVDC transmission project

the insulation level of the HVDC submarine cable is critical to the safe operation of project. The statistical method is applied to calculate the overvoltage distribution of flexible HVDC submarine cables based on the modular multilevel converter in this work. The flexible HVDC submarine cables are studied to get the insulation level of the cables

which connect Dinghai Convertor Station and Daishan Convertor Station in Zhoushan multiterminal flexible HVDC project. The maximum fault overvoltage is obtained by simulating calculation

which is 403.44 k V between conductor and lead sheath

6.72 k V between lead sheath and armor

and 0.39 k V between armor and ground. The insulation level of the cables is determined by the insulation with 30% margin

which is 525 k V between conductor and lead sheath

9 k V between lead sheath and armor

and 0.6 k V between armor and ground. The results can provide the references for the selection and test of the flexible HVDC cables.

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