李金卜,刘宪辉,张晓飞,田凯哲,陈思宇
LI Jinbo,LIU Xianhui,ZHANG Xiaofei,TIAN Kaizhe,CHEN Siyu

• 1:国网冀北电力有限公司超高压分公司

摘要(Abstract)：

针对张北柔性直流电网机械式高压直流断路器在分闸过程中引起直流母线过电压保护动作事件，基于柔性直流电网的特点、机械式高压直流断路器工作原理、直流母线过压保护原理分析，发现在分闸过程中，机械式高压直流断路器转移支路电容电压叠加直流线路电压，导致直流母线过压。针对上述问题，通过调整机械式直流断路器转移支路电容充电回路中的整流二极管方向，改变了转移支路电容极性，解决了直流母线过压问题，并通过仿真验证了该措施的有效性，提高了柔性直流电网运行的可靠性。
Aiming at the DC bus overvoltage protection event caused by the mechanical high-voltage direct current(HVDC)circuit breaker of Zhangbei flexible DC grid during the opening process, the characteristics of the flexible DC grid are introduced. The working principle of the mechanical HVDC circuit breaker and the DC bus overvoltage protection principle are analyzed. It is found that in the process of switching, the transfer branch capacitor voltage of mechanical HVDC circuit breaker superimposes the DC line voltage, resulting in DC bus overvoltage. In response to the above issues, by adjusting the direction of the rectifier diode in the transfer branch capacitor charging circuit of the mechanical DC circuit breaker,the polarity of the transfer branch capacitor is changed, and the problem of DC bus overvoltage caused by the mechanical high voltage DC circuit breaker in the process of breaking is solved. The effectiveness of the measure is verified by simulation, which improves the reliability of the flexible DC grid operation.

关键词(KeyWords)： 柔性直流电网;机械式高压直流断路器;过电压保护;转移支路
flexible DC grid;mechanical HVDC circuit breaker;overvoltage protection;transfer branch

Abstract:

Keywords:

基金项目(Foundation):

作者(Author): 李金卜,刘宪辉,张晓飞,田凯哲,陈思宇
LI Jinbo,LIU Xianhui,ZHANG Xiaofei,TIAN Kaizhe,CHEN Siyu

参考文献(References)：

• [1]赵成勇，陈晓芳，曹春刚，等.模块化多电平换流器HVDC直流侧故障控制保护策略[J].电力系统自动化，2011,35(23):82-87.ZHAO Chengyong, CHEN Xiaofang, CAO Chungang, et al.Control and protection strategies for MMC-HVDC under dc faults[J]. Automation of Electric Power System, 2011, 35(23):82-87.
• [2]李兴源，曾琦，王渝红，等.柔性直流输电系统控制研究综述[J]．高电压技术，2016,42(10):3025-3037.LI Xingyuan, ZENG Qi, WANG Yuhong, et al.Control strategies of voltage source converter based direct current transmission system[J].High Voltage Engineering,2016,42(10):3025-3037.
• [3]马为民，吴方劼，杨一鸣，等.柔性直流输电技术的现状及应用前景分析[J].高电压技术，2014,40(8):2429-2439.MA Weimin, WU Fangjie, YANG Yiming, et al. Flexible HVDC transmission technology's today and tomorrow[J]. High Voltage Engineering, 2014, 40(8):2429-2439.
• [4]王金健，王志新.一种具有限流能力的新型混合式高压直流断路器拓扑[J].电力自动化设备，2019,39(10):143-149.WANG Jinjian, WANG Zhixin. A novel hybrid high-voltage DC circuit breaker topology with current limiting capability[J].Electric Power Automation Equipment, 2019, 39(10):143-149.
• [5]何俊佳.高压直流断路器关键技术研究[J].高电压技术，2019,45(8):2353-2361.HE Junjia. Research on Key Technologies of High Voltage DC Circuit Breaker[J]. High Voltage Engineering, 2019, 45(8):2353-2361.
• [6]魏晓光，周万迪，张升，等.模块化混合式高压直流断路器研究与应用[J].中国电机工程学报，2020,40(6):2038-2045.WEI Xiaoguang, ZHOU Wandi, ZHANG Sheng, et al. Research and Application of Modular Hybrid High Voltage DC Circuit Breaker[J].Proceedings of the CSEE, 2020, 40(6):2038-2045.
• [7]陈羽，石巍，杨兵，等.混合式高压直流断路器控制保护系统[J]．电力工程技术，2021,40(5):164-169.CHEN Yu, SHI Wei, YANG Bing, et al.Hybrid HVDC circuit breaker control and protection system[J]. Electric Power Engineering Technology, 2021, 40(5):164-169.
• [8]王灿，杜船，徐杰雄.中高压直流断路器拓扑综述[J].电力系统自动化，2020,44(9):187-198.WANG Can, DU Chuan, XU Jiexiong. Review of Topologies for Medium-and High-voltage DC Circuit Breaker[J].Automation of Electric Power Systems, 2020, 44(9):187-198.
• [9]许元震，谢晔源，吕玮，等.混合式高压直流断路器供能系统设计[J].高电压技术，2020,46(11):3856-3863.XU Yuanzhen, XIE Yeyuan, LYU Wei, et al.Design of Power Supply System in Hybrid HVDC Circuit Breake[J].High Voltage Engineering, 2020, 46(11):3856-3863.
• [10]陈龙龙，张宁，汤广福，等.混合式高压直流断路器例行试验方法研究[J].电网技术，2020,44(8):3193-3199.CHEN Longlong, ZHANG Ning, TANG Guangfu, et al. Routine Test Method for Hybrid High Voltage Direct Current Breaker[J].Power System Technology, 2020, 44(8):3193-3199.
• [11]刘平，刘朴，姚斯立，等.柔直工程500 k V机械式直流断路器容量试验[J].高压电器，2019,55(12):221-226.LIU Ping, LIU Pu, YAO Sili, et al.Capacity test of 500 kV mechanical DC circuit breaker of flexible DC project[J].High Voltage Apparatus, 2019, 55(12):221-226.
• [12]肖磊石，盛超，卢启付.南方电网首台机械式高压直流断路器在柔性直流输电系统挂网短路试验及仿真[J].高电压技术，2019,45(8):2444-2450.XIAO Leishi, SHENG Chao, LU Qifu.Short-circuit test and simulation of CSG first mechanical HVDC circuit breaker in VSC-HVDC[J].High Voltage Engineering, 2019, 45(8):2444-2450.
• [13]高俊珍，淡淑恒，顾崴，等.机械式高压直流断路器开断性能试验研究[J].高压电器，2020,56(11):0111-0115.GAO Junzhen, DAN Shuheng, GU Wei, et al. Experiment Research on Breaking Capability of Mechanical Type HVDC Circuit Breaker[J]. High Voltage Apparatus, 2020, 56(11):0111-0115.
• [14]范佳琪，任正.特高压配套750 kV线路重合闸过程的短路电流直流分量对系统稳定性影响分析[J].内蒙古电力技术，2021,39(1):31-36.FAN Jiaqi, REN Zheng. Study on Influence of DC Component of Short-Circuit Current of UHV 750 kV line in Reclosing Process on System Stability[J]. Inner Mongolia Electric Power,2021, 39(1):31-36.
• [15]丁久东，冯亚东，朱继红，等.高压直流断路器控制保护系统设计与开发[J].浙江电力，2021,40(3):21-28.DING Jiudong, FENG Yadong, ZHU Jihong, et al. Design and Development of Control and Protection System for High-voltage DC Circuit Breaker[J]. Zhejiang Electric Power,2021, 40(3):21-28.
• [16]阮芹.特高压直流工程GIS、开关类设备制造过程的质量问题及改进措施[J].东北电力技术，2021,42(11):53-55.RUAN Qin. Quality Problems and Improvement Measures for UHVDC Project During GIS and Switch Equipment Manufacturing Process[J]. Northeast Electric Power Technology, 2021, 42(11):53-55.