低压直流双极供电系统的接地型式研究  

Researches on Grounding Types of Low-voltage DC Bipolar Distribution Systems

作　　者：李露露[1] 雍静[1] 曾礼强[1] 何乐婷 

机构地区：[1]输配电装备及系统安全与新技术国家重点实验室(重庆大学),重庆市沙坪坝区400030

出　　处：《中国电机工程学报》2014年第13期2210-2218,共9页Proceedings of the CSEE

基　　金：国家自然科学基金项目(51077138)~~

摘　　要：针对民用低压直流供电系统的接地型式和电气安全问题,分析基于直流微网、电压平衡器的直流双极供电系统的接地故障参数,利用Matlab/Simulink软件构建DC?190 V系统进行验证。在此基础上,讨论各接地型式的供电连续性、电击防护性能与保护设备要求。与传统交流220 V供电系统的对比表明:低压直流供电系统在电气安全方面有较明显的优势;直流TT系统在配备剩余电流保护器的情况下,其供电连续性和电气安全性能可以得到很好兼顾,相较直流IT和直流TN系统而言,更适合作为该类含有电压平衡器的直流双极供电系统的接地型式。并给出了保证其电气安全的接地电阻取值范围及保护装置技术要求。For the civil low voltage DC distribution systems, selecting a suitable grounding type and improving electrical security is of significance. Using the DC bipolar distribution system based on DC micro-girds and voltage balancer as the research subject, this paper presented the grounding fault parameters and validated them with the aid of Matlab/Simulink software. On this basis, this paper discussed the power supply continuity, protection property against electric shock and protection requirement for each grounding type. It indicates that, compared with the traditional AC 220 V distribution system, the low voltage DC distribution system has a significant advantage in terms of electrical security. In addition, the power supply continuity and the electrical security of the DC TT system equipped with residual current device （RCD） can be improved as well, which is more suitable for this bipolar distribution system with voltage balancer than IT or TN system. Finally, the allowed range values of the grounding resistors and technical requirements are given to ensure the electrical security.

关 键 词：低压直流 双极供电系统 接地型式 电气安全 

分 类 号：TM72[电气工程—电力系统及自动化]