中压电网对地电容检测的注入信号源设计  

Design of injecting signal source applied in measuring capacitive current of distribution network

作　　者：李毅敏[1] 蔡旭[1] 

机构地区：[1]上海交通大学电气工程系,上海200240

出　　处：《继电器》2007年第9期45-51,共7页Relay

基　　金：国家重点新产品计划项目(2002ED620004);上海市科委2003年重大专项基金(03DZ14014)

摘　　要：在中性点经消弧线圈接地的中压配网里,为了使接地故障时的补偿达到最好的效果,必须准确检测配网的对地电容。利用信号注入法测量中压配网的对地电容,具有诸多其他方法所不具备的优点,且可达到所要求的精度。而应用信号注入法的前提是需要具备一系列特殊要求的注入信号源,提出了一种新型的基于DSP控制芯片和智能功率模块IPM的变频恒流信号源设计。试验结果表明该变频恒流信号源可控性强,工作稳定,精度高。In the distribution network with neutral grounding via arc suppression coil, for the purpose of getting the best compensation result in the ground fault, the capacitive current of the network must be detected correctly. And the injecting approach on measuring the capacitive current meets this target and has much advantages compared with other methods. But this approach is based on an injecting source with special requirement. This paper proposes an innovative fixed-current variable-frequency signal source design with DSP and IPM. And the experiment result shows this signal source possesses the outstanding controllable ability and high accuracy.

关 键 词：对地电容电流 变频恒流源 DSP PID 

分 类 号：TM934.2[电气工程—电力电子与电力传动]