基于PLC的配电网电容电流测量装置的设计与实现  

Development of Capacitive Current Measuring Instrument Based on PLC for Power Distribution System

作　　者：杨匀阳 夏斌[1] 张雨[1] 周达[1] 张春辉 

机构地区：[1]长沙理工大学电气与信息工程学院,湖南长沙410076 [2]长沙信长电力科技有限公司,湖南长沙410076

出　　处：《中国电力》2015年第4期127-130,136,共5页Electric Power

摘　　要：谐振接地系统电容电流的准确测量决定了消弧线圈的补偿效果,而采用最大位移电压法对系统电容电流进行测量的关键是准确找到中性点最大位移电压。为此基于可编程逻辑控制器PLC辅以相关的外围电路,设计了电容电流测量装置,并对自动跟踪系统运行方式、闭环控制测量电容电流等软件的设计思路进行了说明。测量装置在10 k V模拟配电网上的实验结果表明,该装置能够准确测量系统的电容电流,并能够实时监测中性点位移电压、消弧线圈回路电流以及正在运行的馈线数目,根据运行方式变化特征,灵敏准确地跟踪系统的运行方式,提升了消弧线圈的补偿效果。Accurate measurement of capacitive current of resonant grounding system determines the compensation effect of Petersen coil. However, key to distribution system capacitive current measurement by maximum displacement voltage method is to find the neutral point maximum displacement voltage accurately. A capacitive current measuring device is designed based on Programmable Logic Controller （PLC）. The ideas of automatic system operation tracking, capacitance current measuring by close-loop control are explained. The experimental results show that proposed measurement device is able to measure system capacitive current accurately. The device is also able to monitor system neutral point displacement voltage, are suppression coil loop current and number of energized feeders in real time. Based on current system operation condition, the device can track system operation closely and improve compensation effect of Petersen coil in system.

关 键 词：PLC控制器 配电网 电容电流 测量装置 设计 

分 类 号：TM933.1[电气工程—电力电子与电力传动]