基于恒频注入信号的消弧线圈自动跟踪补偿技术研究  

Automatic arc suppression coil compensation technology based on fixed-frequency signal injection method

作　　者：丛伟[1] 李盼盼[1] 李洪涛[2] 王勇焕[2] 刘振伶[2] 张晓峰 陈远喆 

机构地区：[1]山东大学电气工程学院,山东济南250061 [2]河南油田水电厂,河南南阳473132 [3]济南富吉电气有限公司,山东济南250011

出　　处：《电力系统保护与控制》2010年第19期185-189,共5页Power System Protection and Control

基　　金：国家自然科学基金资助项目(50807032)使

摘　　要：目前大多数消弧线圈补偿方案都是基于测量故障发生后的分布电容电流大小而展开的,属于故障后补偿,该类方案难以满足分布电容电流较大系统的补偿要求。提出基于恒频注入信号的消弧线圈自动跟踪补偿方案,在系统正常运行时即可准确测得分布电容,并根据设定的脱谐度自动调节消弧线圈,在单相接地故障发生前就可做好补偿准备。对于运行方式灵活、分布电容经常变化的配电网,能够快速、准确跟踪分布电容的变化,达到理想的补偿效果。该方法能够准确计算出系统的分布电容和绝缘电阻,用来监视系统的绝缘情况。实验室模拟实验和现场运行实验结果表明,基于恒频注入信号的消弧线圈自动跟踪补偿方案具有很高的精度和灵敏度,能够较好地满足现场需求。Most of the arc suppression coil compensation systems work based on the magnitude of post-fault distributed capacitance current.In power system with large distributed capacitance current,because this system can not offer compensation before fault,large current shock is inevitable. This paper proposes an automatic arc suppression coil compensation technology based on fixed-frequency signal injection method, which can calculate system equivalent distributed capacitance accurately in normal operation status, a nd then adjust the arc suppression coil according to pre-determined compensation degree.This system can offer compensation before the occurrence of single-phase ground fault, and can possess preferable compensation effect for distribution system with flexible operation manner and variation distributed capacitance. This method can calculate distribution capacitance and insulation resistor to monitor the insulation status of power system. Laboratory simulation test and field test running results indicate that the arc suppression coil compensation system based on fixed-frequency signal injection method has high accuracy and sensitivity and can offer ideal compensation effect for distribution system. This work is supported by National Natural Science Foundation of China （No.50807032）.

关 键 词：恒频注入信号 消弧线圈 跟踪补偿 小电流接地系统 

分 类 号：TM475[电气工程—电器]