海上风电柔性直流换流阀端间绝缘试验异常分析及改进方法

doi:10.12204/j.issn.1000-7229.2021.12.008

电力建设 ›› 2021, Vol. 42 ›› Issue (12): 68-74.doi: 10.12204/j.issn.1000-7229.2021.12.008

• 高渗透率可再生能源发电及其先进并网技术·栏目主持张兴教授、李飞副教授· • 上一篇下一篇

海上风电柔性直流换流阀端间绝缘试验异常分析及改进方法

杨张斌¹^,³, 阮琳¹^,²(), 雷肖³, 彭代晓³, 刘明洋⁴

1.中国科学院大学,北京市100049
2.中国科学院电工研究所,北京市100190
3.中国三峡建工(集团)有限公司,成都市 610041
4.三峡大学电气与新能源学院,湖北省宜昌市443002

收稿日期:2021-05-21 出版日期:2021-12-01 发布日期:2021-11-26
通讯作者: 阮琳 E-mail:Yosaline@mail.iee.qc.cn
作者简介:杨张斌(1983),男,博士研究生,高级工程师,主要研究方向为电力设备新技术、海上大容量柔性直流输电技术;
雷肖(1980),男,博士,教授级高级工程师,主要研究方向为海上大容量柔性直流输电技术;
彭代晓(1994),男,博士,高级工程师,主要研究方向为海上大容量柔性直流输电技术;
刘明洋(2000),女,学士,主要研究方向为能源动力。
基金资助:
国家自然科学基金资助项目(51777201)

Abnormality Analysis and Improved Method of the Field Partial Discharge for Terminal Insulation Experiment of the MMC Valve for Offshore Wind Power Transmission

YANG Zhangbin¹^,³, RUAN Lin¹^,²(), LEI Xiao³, PENG Daixiao³, LIU Mingyang⁴

1. University of Chinese Academy of Sciences, Beijing 100049,China
2. The Institute of Electrical Engineering of Chinese Academy of Sciences, Beijing 100190,China
3. China Three Gorges Construction Engineering Corporation, Chengdu 610041, China
4. College of Electrical Engineering & New Energy, China Three Gorges University,Yichang 443002, Hubei Province, China

Received:2021-05-21 Online:2021-12-01 Published:2021-11-26
Contact: RUAN Lin E-mail:Yosaline@mail.iee.qc.cn
Supported by:
National Natural Science Foundation of China(51777201)

摘要/Abstract

摘要：

柔性直流输电是海上风电远距离规模化集中开发的重要技术。作为柔性直流输电的核心设备,换流阀运行工况复杂,其安全运行直接影响整个系统的可靠性与稳定性,因此必须通过系列型式试验,从运行和绝缘等方面考核换流阀的设计。针对某海上风电柔性直流输电换流阀端间绝缘耐压试验中出现的直流局部放电异常情况,分析了异常产生的原因,并提出了一种基于回路补偿的端间绝缘改进试验方法。该方法在符合相关国家标准规范的前提下,能够有效验证同类拓扑结构多重阀单元外绝缘及各个单阀之间的电压耐受能力和局部放电水平,为以后采用更高电压等级换流阀端间绝缘试验的顺利开展提供借鉴。

关键词: 海上风电, 柔性直流, 换流阀, 局部放电, 回路补偿

Abstract:

Large scale development of offshore wind power will become an important way to achieve the national energy structure adjustment and energy conservation and emission reduction goals. Flexible DC transmission is an important technology for large-scale centralized development of offshore wind power. In order to ensure the high-reliability operation of the off-shore flexible transmission project, a series of tests must be carried out to check the correctness of the converter valve design before it is delivered to the offshore site. For modular multilevel converter with symmetrical monopole topology in an offshore flexible DC transmission project, this paper analyzes the mechanism of abnormal DC partial discharge during dielectric tests on multi-valve unit. Referring to the relevant standards and the experience of previous projects, this paper studies and proposes a test method to solve the abnormal DC partial discharge measurement. On the premise of meeting the standards and specifications, this method can effectively verify the voltage withstand ability and partial discharge level of the multi-valve units with the same topology, and provide reference for the smooth development of dielectric tests on multi-valve unit with higher voltage level in the future.

Key words: offshore wind power, VSC-HVDC, converter valve, partial discharge, loop compensation

中图分类号:

TM46

杨张斌, 阮琳, 雷肖, 彭代晓, 刘明洋. 海上风电柔性直流换流阀端间绝缘试验异常分析及改进方法[J]. 电力建设, 2021, 42(12): 68-74.

YANG Zhangbin, RUAN Lin, LEI Xiao, PENG Daixiao, LIU Mingyang. Abnormality Analysis and Improved Method of the Field Partial Discharge for Terminal Insulation Experiment of the MMC Valve for Offshore Wind Power Transmission[J]. ELECTRIC POWER CONSTRUCTION, 2021, 42(12): 68-74.

图/表 11

表1 直流局放限值

Table 1 Thresholds for DC partial discharge

表2 被测换流阀参数

Table 2 Parameters of the test valve

图1 MMC拓扑示意图

Fig.1 Topology of the MMC

表3 试验电压及要求

Table 3 Test voltages and other requirements

图2 阀端间耐压试验电路原理

Fig.2 Principle of the test circuit for valve terminal withstand voltage

图3 试验回路

Fig.3 Test circuits

图4 交流相电压波形

Fig.4 AC Phase voltage

图5 试验交流变压器Tr2的二次侧交流电压波形

Fig.5 Secondary voltage of Tr2

图6 试验变压器直流偏磁仿真结果

Fig.6 Simulation for DC magnetic bias

图7 带补偿支路的改进试验回路

Fig.7 Improved test circuit with supplementary branch

图8 改进后的交流电压

Fig.8 Improved AC voltage

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海上风电柔性直流换流阀端间绝缘试验异常分析及改进方法

Abnormality Analysis and Improved Method of the Field Partial Discharge for Terminal Insulation Experiment of the MMC Valve for Offshore Wind Power Transmission

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