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

doi:10.12204/j.issn.1000-7229.2021.12.008

Abstract

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

CLC Number:

TM46

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.

Figures/Tables 11

Table 1 Thresholds for DC partial discharge

Table 2 Parameters of the test valve

Fig.1 Topology of the MMC

Table 3 Test voltages and other requirements

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

Fig.3 Test circuits

Fig.4 AC Phase voltage

Fig.5 Secondary voltage of Tr2

Fig.6 Simulation for DC magnetic bias

Fig.7 Improved test circuit with supplementary branch

Fig.8 Improved AC voltage

References 20

[1]	迟永宁, 梁伟, 张占奎, 等. 大规模海上风电输电与并网关键技术研究综述[J]. 中国电机工程学报, 2016, 36(14): 3758-3771.
	CHI Yongning, LIANG Wei, ZHANG Zhankui, et al. An overview on key technologies regarding power transmission and grid integration of large scale offshore wind power[J]. Proceedings of the CSEE, 2016, 36(14): 3758-3771.
[2]	袁志昌, 郭佩乾, 刘国伟, 等. 新能源经柔性直流接入电网的控制与保护综述[J]. 高电压技术, 2020, 46(5): 1460-1475.
	YUAN Zhichang, GUO Peiqian, LIU Guowei, et al. Review on control and protection for renewable energy integration through VSC-HVDC[J]. High Voltage Engineering, 2020, 46(5): 1460-1475.
[3]	刘卫东, 李奇南, 王轩, 等. 大规模海上风电柔性直流输电技术应用现状和展望[J]. 中国电力, 2020, 53(7): 55-71.
	LIU Weidong, LI Qinan, WANG Xuan, et al. Application status and prospect of VSC-HVDC technology for large-scale offshore wind farms[J]. Electric Power, 2020, 53(7): 55-71.
[4]	卢毓欣, 赵晓斌, 李岩, 等. 海上风电送出用柔性直流换流站电气主接线[J]. 南方电网技术, 2020, 14(12): 25-31.
	LU Yuxin, ZHAO Xiaobin, LI Yan, et al. Main electrical connection of VSC-HVDC converter stations for offshore wind farm integration[J]. Southern Power System Technology, 2020, 14(12): 25-31.
[5]	唐巍, 郭雨桐, 闫姝, 等. 多场景海上风电场关键设备技术经济性分析[J]. 中国电力, 2021, 54(7):178-184,216.
	TANG Wei, GUO Yutong, YAN Shu, et al. Techno-economic Analysis of Key Equipment for Offshore Wind Farms with Multiple Scenarios[J]. China Electric Power, 2021, 54(7):178-184,216.
[6]	侯婷, 饶宏, 许树楷, 等. 基于MMC的柔性直流输电换流阀型式试验方案[J]. 电力建设, 2014, 35(12): 61-66.
	HOU Ting, RAO Hong, XU Shukai, et al. Valve type test scheme for flexible DC transmission system based on MMC[J]. Electric Power Construction, 2014, 35(12): 61-66.
[7]	范彩云, 胡秋玲, 陶颍军, 等. ±500 kV柔性直流换流阀电场分布及绝缘特性研究[J]. 高压电器, 2017, 53(10): 183-189,197.
	FAN Caiyun, HU Qiuling, TAO Yingjun, et al. Research of electric field distribution and insulation properties for ±500 kV VSC-HVDC converter valve[J]. High Voltage Apparatus, 2017, 53(10): 183-189,197.
[8]	刘壮, 胡治龙, 同聪维, 等. MMC型电压源换流器阀运行试验研究[J]. 高压电器, 2018, 54(9): 154-159,165.
	LIU Zhuang, HU Zhilong, TONG Congwei, et al. Study on operational tests of voltage source converter valve based on MMC[J]. High Voltage Apparatus, 2018, 54(9): 154-159,165.
[9]	庄志发, 冉学彬, 龙正兴, 等. MMC-HVDC系统的充电启动方案和现场试验[J]. 广东电力, 2019, 32(7): 81-89.
	ZHUANG Zhifa, RAN Xuebin, LONG Zhengxing, et al. Charging start-up program and field test for MMC-HVDC system[J]. Guangdong Electric Power, 2019, 32(7): 81-89.
[10]	IEC. Voltage sourced converter (VSC) valves for high-voltage direct current (HVDC) power transmission:Electrical testing: IEC 62501—2017 [S]. IEC, 2017.
[11]	中华人民共和国国家质量监督检验检疫总局, 中国国家标准化管理委员会. 高压直流输电用电压源换流器阀电气试验:GB/T 33348—2016[S]. 北京: 中国标准出版社, 2016.
[12]	胡伟涛, 祝晓辉, 闫佳文, 等. 500kV变压器局部放电异常的分析及处理[J]. 电工技术, 2018(23): 102-103,105.
	HU Weitao, ZHU Xiaohui, YAN Jiawen, et al. Analysis and treatment of abnormal partial discharge in 500kV transformer[J]. Electric Engineering, 2018(23): 102-103,105.
[13]	汤广福, 温家良, 贺之渊, 等. 大功率电力电子装置等效试验方法及其在电力系统中的应用[J]. 中国电机工程学报, 2008, 28(36): 1-9.
	TANG Guangfu, WEN Jialiang, HE Zhiyuan, et al. Equivalent testing approach and its application in power system for high power electronics equipments[J]. Proceedings of the CSEE, 2008, 28(36): 1-9.
[14]	罗湘, 汤广福, 查鲲鹏, 等. 电压源换流器高压直流输电换流阀的试验方法[J]. 电网技术, 2010, 34(5): 25-29.
	LUO Xiang, TANG Guangfu, ZHA Kunpeng, et al. Test methods of converter valves in VSC-HVDC power transmission[J]. Power System Technology, 2010, 34(5): 25-29.
[15]	郑黎明, 贾科, 毕天姝, 等. 海上风电接入柔直系统交流侧故障特征及对保护的影响分析[J]. 电力系统保护与控制, 2021, 49(20): 20-32.
	ZHENG Liming, JIA Ke, BI Tianshu, et al. AC-side fault analysis of a VSC-HVDC transmission system connected to offshore wind farms and the impact on protection[J]. Power System Protection and Control, 2021, 49(20): 20-32.
[16]	周斌, 陈梦琦, 郑海涯, 等. 谐振接地系统单相断线并坠地故障电压特征仿真分析[J]. 电力系统保护与控制, 2021, 49(17): 93-100.
	ZHOU Bin, CHEN Mengqi, ZHENG Haiya, et al. Simulation analysis of voltage characteristics of a single-phase line-broken and grounding fault in a resonant grounded system[J]. Power System Protection and Control, 2021, 49(17): 93-100.
[17]	倪鹤立, 姚维强, 傅晨钊, 等. 电力设备局部放电技术标准现状述评[J/OL]. (2021-04-21)[2021-05-11].高压电器, https://kns.cnki.net/kcms/detail/61.1127.tm.20210420.1419.002.html.
	NI Heli, YAO Weiqiang, FU Chenzhao, et al. Review on technical standards for measurement of partial discharge in electrical equipment[J/OL].(2021-04-21)[2021-05-11].High Voltage Apparatus, https://kns.cnki.net/kcms/detail/61.1127.tm.20210420.1419.002.html.
[18]	谢齐家, 普子恒, 杜志叶, 等. 现场局部放电试验对称加压方式的补偿电抗器参数研究[J]. 中国电力, 2015, 48(11): 45-48,75.
	XIE Qijia, PU Ziheng, DU Zhiye, et al. Compensation reactor parameters study of symmetrical voltage applying mode for on-site partial discharge test of ultra high voltage converter transformer[J]. Electric Power, 2015, 48(11): 45-48,75.
[19]	刘静一, 董朝阳, 吉攀攀, 等. 基于MMC的柔性直流输电换流阀试验系统设计[J]. 电力电子技术, 2021, 55(6): 25-28.
	LIU Jingyi, DONG Chaoyang, JI Panpan, et al. Design of the test system of converter valve for flexible DC transmission based on MMC[J]. Power Electronics, 2021, 55(6): 25-28.
[20]	李江峡, 黄景光, 张宇鹏, 等. 抑制直流偏磁导致的互感器饱和的直流补偿法[J]. 科学技术与工程, 2021, 21(9): 3618-3625.
	LI Jiangxia, HUANG Jingguang, ZHANG Yupeng, et al. Direct current compensation of the current transformer transient saturation caused by direct current bias suppression[J]. Science Technology and Engineering, 2021, 21(9): 3618-3625.