非隔离型交直流混合系统剩余电流特性分析  

Analysis of residual current characteristics of non isolated AC/DC hybrid system

作　　者：任朝君 童亦斌[1] 赵宇明 郝斌 曾维波 REN Zhaojun;TONG Yibin;ZHAO Yuming;HAO Bin;ZENG Weibo(National Active Distribution Network Technology Research Center,Beijing Jiaotong University,Beijing 100044,China;Shenzhen Power Supply Bureau Co.,Ltd.,Shenzhen 518001,China;Shenzhen Building Science Research Institute Co.,Ltd.,Shenzhen 518049,China;Jiangsu Goodway Power Technology Co.,Ltd.,Suzhou 215011,China)

机构地区：[1]北京交通大学国家能源主动配电网技术研发中心,北京100044 [2]深圳供电局有限公司,广东深圳518001 [3]深圳市建筑科学研究院股份有限公司,广东深圳518049 [4]江苏固德威电源科技股份有限公司,江苏苏州215011

出　　处：《供用电》2022年第7期50-57,共8页Distribution & Utilization

基　　金：中国南方电网有限责任公司科技项目(090000KK 52210132)。

摘　　要：非隔离型交直流混合系统正常工作时产生的交流泄漏电流表现为剩余电流形式,可能会造成剩余电流保护误动作,影响电击故障保护效果。首先,从泄漏电流和故障电流2个方面,通过剩余电流特性分析,确定了系统正常工作和事故状态下剩余电流的频谱分布情况,通过分析电流的人体效应和剩余电流保护器的保护动作有效性,确定了影响系统用电安全的剩余电流频段。然后,利用仿真模型,验证了正弦脉宽调制和空间矢量脉宽调制2种方式下,系统正常工作和发生电击事故时的剩余电流特性,并验证了分布式电源接入对剩余电流的影响以及换流器采用单级、两级结构的系统发生事故时,剩余电流变化的差异性。最后,根据理论分析和仿真结果,提出了系统保护配置方案。The AC leakage current generated by the non isolated AC/DC hybrid system during the normal operation is in the form of residual current, which may cause the residual current protection to malfunction and affect the electric shock fault protection effect.In this paper, from the aspects of leakage current and fault current, through the analysis of residual current characteristics, the spectrum distribution of the residual current under normal operation and accident state of the system is determined.By analyzing the human body effect of the current and the effectiveness of the RCD protection action, the residual current frequency band that affects the safety of the system is determined, and then the simulation model is used to verify the residual current characteristics of the normal system operation and electric shock accidents under the SPWM and SVPWM modulation modes, then verify the influence of distributed power access on the residual current, also the difference of residual current change in the system with single-stage and two-stage converters in the event of an accident.Finally, based on the theoretical analysis and simulation results, the protection configuration scheme of the system is proposed.

关 键 词：非隔离 交直流混合系统 泄漏电流 故障电流 剩余电流 

分 类 号：TM71[电气工程—电力系统及自动化]