MMC—HVDC直流输电线路的保护研究  

Protection study of MMC—HVDC DC transmission lines

作　　者：刘易 陈芳芳[1] 秦滨慧 解海翔 盖佳郇 徐天奇[1] LIU Yi;CHEN Fangfang;QIN Binhui;XIE Haixiang;GAI Jiaxun;XU Tianqi(School of Electrical Information Engineering,Yunnan Minzu University,Kunming 650031,China;Dali Power Supply Bureau of Yunnan Power Grid Company,Dali 671000,China)

机构地区：[1]云南民族大学电气信息工程学院,云南昆明650031 [2]云南电网公司大理供电局,云南大理671000

出　　处：《电子设计工程》2022年第16期169-175,共7页Electronic Design Engineering

摘　　要：MMC—HVDC(Modular Multilevel Converter—High Voltage Direct Current)直流输电系统发展的关键技术之一,就是直流侧故障的灵敏与快速识别。文中对MMC—HVDC的拓扑结构和运行原理进行分析,根据叠加原理,通过故障的附加网络对保护区内和区外故障进行分析,并利用三阶微分综合立方法提取电压和电流的故障分量。通过对故障的附加网络分析,可以得到:利用电流故障分量的极性进行区内外故障的识别,当识别为区内故障时,通过故障电压分量极性进行故障选极。经仿真验证,该方法能够快速准确地识别区内外故障,进行故障选极。One of the key technologies in the development of the MMC-HVDC(Modular Multilevel Converter-High Voltage Direct Current) DC transmission system is the sensitivity and rapid identification of DC side faults. This paper analyzes the topology and operating principle of MMC-HVDC,analyzes the faults in and out of the protected area through the additional network of faults,and uses the third-order differential integrated method to extract the fault components of voltage and current. Through the analysis of the additional network of fault,it can be obtained: the polarity of the current fault component is used to identify the fault in the region and beyond,and when it is identified as the fault in the region,the fault selection pole is carried out by the fault voltage component polarity. The simulation proves that the method can be sensitive and quickly identify the faults inside and outside the region,and carry out the fault selection pole.

关 键 词：MMC—HVDC 电流故障分量 电压故障分量 三阶微分综合立方法 PSCAD 

分 类 号：TN7[电子电信—电路与系统]