双极直流配电系统中的单极故障重构:影响因素与重构方案  

Monopolar Fault Reconfiguration in Bipolar DC Distribution System:Influence Factors and Reconfiguration Scheme

作　　者：邓永坤 马建军 朱淼[2] 文书礼 陈奕嘉 归宇承 DENG Yongkun;MA Jianjun;ZHU Miao;WEN Shuli;CHEN Yijia;GUI Yucheng(College of Smart Energy,Shanghai Jiao Tong University,Minhang District,Shanghai 200240,China;Key Laboratory of Control of Power Transmission and Conversion,Ministry of Education(Shanghai Jiao Tong University),Minhang District,Shanghai 200240,China;School of Electrical Engineering,Shanghai University of Electric Power,Minhang District,Shanghai 200240,China)

机构地区：[1]上海交通大学国家电投智慧能源创新学院,上海市闵行区200240 [2]电力传输与功率变换控制教育部重点实验室(上海交通大学),上海市闵行区200240 [3]上海电力大学电气工程学院,上海市闵行区200240

出　　处：《中国电机工程学报》2025年第5期1860-1873,I0021,共15页PROCEEDINGS OF THE CHINESE SOCIETY FOR ELECTRICAL ENGINEERING

基　　金：国家自然科学基金项目(U2166216)。

摘　　要：在双极直流配电系统中,单极接地故障往往导致非故障极的连锁故障。为提升双极直流配电可靠性,提出双极直流配电系统单极故障重构概念。首先,建立双极系统单极接地故障暂态特性模型,并分析3种影响因素对单极故障重构影响机理,影响因素分别为极间电容的接地方式、非故障极功率缺额以及电压均衡器闭锁延时。其中,可通过极间电容中性点接地,来降低极间电容放电所导致的非故障极过电压。同时,为降低非故障极功率缺额以及电压均衡器闭锁延时的影响,提出基于故障电流暂态变化量的非故障极切负荷方案与电压均衡器闭锁方案。仿真与实验结果验证表明,所提出的单极故障重构方案能够保证非故障极为关键负荷提供不间断供电,改善非故障极供电电能质量,有效提升了双极直流配电系统的供电可靠性。In a bipolar DC distribution system,a monopolar grounding fault often results in cascade failures on the healthy pole.To improve the reliability of bipolar DC distribution,the concept of monopolar fault reconfiguration is proposed for a bipolar DC system.The dynamic model of a monopolar fault in a bipolar DC system is established and the impact of three factors on the mechanism of monopolar fault reconfiguration is analyzed.The three influencing factors are the grounding type of inter-pole capacitance,the power deficiency of the non-fault pole,and protection delay of the voltage balancer.Based on the mechanism analysis of overvoltage generation on the non-fault pole,the optimized configuration scheme for the inter-pole capacitance grounded through the neutral point is proposed in this paper.To reduce the impact of non-fault pole power shortage and voltage balancer protection delay,this paper proposes the non-fault pole load shedding scheme and the voltage balancer locking scheme based on the transient change of fault current.Simulation and experimental results verify that the monopolar fault reconfiguration scheme proposed in this paper can effectively improve the power supply reliability and the power quality for the critical load in a bipolar DC distribution system.

关 键 词：双极直流配电系统 单极故障重构 电压均衡器 切负荷 保护方案 

分 类 号：TM72[电气工程—电力系统及自动化]