基于改进不平衡电桥的直流系统故障检测研究  

DC System Fault Detection Based on Improved Unbalanced Bridge

作　　者：李玮[1] 赵攀[1] 赵丽杰[1] Li Wei;Zhao Pan;Zhao Lijie(Jiangsu Datang International Lusigang Power Generation Co.,Ltd.,Qidong Jiangsu 226200,China)

机构地区：[1]江苏大唐国际吕四港发电有限责任公司,江苏启东226200

出　　处：《电气自动化》2018年第6期52-54,共3页Electrical Automation

基　　金：江苏大唐国际吕四港发电有限责任公司科技项目WLSFDEQ(2017)0003:发电厂直流系统故障主动监测与隔离技术研究及装置开发

摘　　要：直流系统接地故障和交流窜入故障易引发系统保护装置误动、拒动等问题,影响电网的安全运行。基于不平衡电桥和隔直电容原理,提出了改进不平衡电桥法。通过在MATLAB/Simulink仿真以及搭建实物模型验证了检测电路的合理性。结果表明,可对故障进行有效检测,易实现。The grounding fault of the DC system and the fault of AC intrusion into DC system may lead to the maloperation and rejection of the system protection device,which may affect the safe operation of the power grid. Based on the traditional unbalanced bridge and blocking condenser principle,the IUB（Improved Unbalance Bridge） circuit method was put forward. The rationality of the detection circuit was verified by the simulation of MATLAB/Simulink and the building of the physical model. The results show that the method can detect the fault effectively and be realized easily.

关 键 词：不平衡电桥法 直流系统 接地故障 交流窜入 硬件平台 

分 类 号：TM74[电气工程—电力系统及自动化]