南方电网技术2023，Vol.17Issue(12)：10-17,8.DOI:10.13648/j.cnki.issn1674-0629.2023.12.002
广东背靠背柔性直流工程最后断路器过电压特性与优化
Overvoltage Characteristics and Optimization of Last Breaker in Guangdong Back-to-Back VSC-HVDC Project
摘要
Abstract
For Guangdong back-to-back volatage source converter-high voltage direct current(VSC-HVDC)project,there are only two outgoing lines on the AC side and only one lower level substation,the risk of the last circuit breaker appearing in the converter is high.In the project,the last circuit breaker protection will be configured to prevent equipment overvoltage damage.In order to reduce the overvoltage characteristics and improve the action time margin of the last breaker protection,based on the topology and control strategy of Guangdong back-to-back VSC-HVDC project,the overvoltage mechanism and characteristics under three-phase and single-phase tripping conditions are studied.Then the range of amplitude limit of the positive and negative sequence modulation signal is analyzed,and a method to reduce overvoltage characteristics by optimizing the amplitude limits is proposed,and EMTDC simulation is carried out.The results show that the overvoltage characteristics of back-to-back VSC-HVDC are strongly related to the positive and negative sequence control,and the overvoltage of single-phase tripping of the last breaker is more serious than that of three-phase tripping,the saturation characteristic of transformer will restrain overvoltage,but it will make the control response more complex.The method proposed in this paper can significantly improve the action time margin of the last breaker protection action.关键词
背靠背柔性直流/换流器的最后断路器/正负序控制/断路器单相跳闸/过电压特性Key words
back-to-back VSC-HVDC/last breaker of converter/positive and negative sequence control/single-phase tripping of the breaker/overvoltage characteristics分类
信息技术与安全科学引用本文复制引用
宋长青,罗新,谢剑翔,郭铸,陈奥博,黄伟煌..广东背靠背柔性直流工程最后断路器过电压特性与优化[J].南方电网技术,2023,17(12):10-17,8.基金项目
广东电网有限责任公司广州供电局咨询项目(1500002022030201ZL00005) （1500002022030201ZL00005）
广东省重点领域研发计划资助项目(2019B11109001). Supported by the Consulting Project of Guangzhou Power Supply Bureau of Guangdong Power Grid Co.,Ltd.(1500002022030201ZL00005) （2019B11109001）
the Key Research and Development Program of Guangdong Province(2019B11109001). （2019B11109001）
