摘要
在当前重要的中低压直流配电系统中,均采用两套独立的直流系统对设备进行供电,而直流环网故障则会导致两套系统发生一定的电气连接,严重危害了直流系统中的运行设备。针对直流环网故障,提出了一种基于隔离型DC/DC变换器的主动保护方案,即将变换器自身的结构优势应用在了直流系统的保护技术上,实现了对环网故障一系列的主动处理。文中阐述了环网故障的形成原因与危害,详细说明了主动保护的实现原理,分析了并联式变换器模块的控制策略,并且给出了环网故障的主动检测方案,最后通过仿真验证了该主动保护方案拥有良好的供电可靠性和故障隔离功能,最大程度保证了直流系统的安全运行。
In the current important MV/LV DC distribution system,two sets of independent DC systems are used to supply power to the equipment,and the fault of DC loop network will lead to a certain electrical connection between the two sets of systems which seriously endanger the operation equipment of the DC system.Aiming at the fault of DC loop network,this paper proposes an active protection scheme based on isolated DC/DC converter,which applies the structural advantages of converter itself to the protection technology of DC system,and realizes a series of active treatment for the fault of DC loop network.This paper firstly expounds causes and hazards of the fault of loop network,and then,elaborates on the realization principle of active protection,analyzes the control strategy of parallel converter module,and gives the active detection scheme of the fault of loop network.Finally,the simulation result verifies that the active protection scheme has good power supply reliability and function of fault isolation,which guarantees the safe operation of the DC system to the greatest extent.
作者
李媛
李希元
曹子恒
曲妍
郎斌
Li Yuan;Li Xiyuan;Cao Ziheng;Qu Yan;Lang Bin(School of Electriacl Engineering and Informartion Technology,Sichuan,University,Chengdu 610065,China;State Grid Liaoning Electric Power Company Limited,Shenyang 110006,China;State Grid Shenyang Electric Power Supply Company,Shenyang 110000,China)
出处
《电测与仪表》
北大核心
2020年第17期106-115,共10页
Electrical Measurement & Instrumentation
基金
国家电网有限公司总部科技项目(SGLNDK00 DWJS1800020)。
