摘要
随着PWM变频器在电机控制中的广泛应用,在电机控制性能显著提高的同时,系统共模电流(正常漏电流)的问题愈发严重。同时,当电机系统发生漏电故障时,现有漏电保护装置不能区分故障漏电流和正常漏电流,导致系统存在安全隐患。针对此问题,首先对PWM电机系统正常漏电流计算模型和流通路径进行研究,然后对系统的漏电故障点及相应故障漏电流进行了分析,最后通过试验测试对PWM电机系统正常漏电流和正常与故障混合漏电流的时频特性进行深入分析和研究,为正常漏电流的有效抑制和故障漏电流的准确检测提供理论指导。
With the wide application of PWM converter in motor control, the motor control performance is significantly improved, but the problems caused by common-mode current (normal leakage current) are becoming more and more serious. In addition, when leakage fault occurs in motor system, the conventional leakage fault protection devices cannot distinguish between fault leakage current and normal leakage current, which leads to a security risk in the system. In order to solve these problems, this paper firstly studies the calculation model and flow path of normal leakage current in PWM motor system. Then the leakage fault point and the corresponding fault leakage current of motor system are analyzed. Finally, the time/frequency domain characteristics of the normal leakage current as well as the normal and fault mixed leakage current in PWM motor system are analyzed through experimental testing. The conclusions provide theoretical guidance for the effective suppression of normal leakage current and the accurate detection of fault leakage current.
作者
牛峰
曹石然
王尧
韩振铎
黄晓艳
张健
李奎
方攸同
Niu Feng;Cao Shiran;Wang Yao;Han Zhenduo;Huang Xiaoyan;Zhang Jian;Li Kui;Fang Youtong(State Key Laboratory of Reliability and Intelligence of Electrical EquipmentHebei University of Technology Tianjin 300130 China;Key Laboratory of Electromagnetic Field and Electrical Apparatus Reliability of Hebei ProvinceHebei University of Technology Tianjin 300130 China;College of Electrical Engineering Zhejiang University Hangzhou 310027 China)
出处
《电工技术学报》
EI
CSCD
北大核心
2019年第8期1599-1606,共8页
Transactions of China Electrotechnical Society
基金
国家自然科学基金(51707174)
博士后创新人才支持计划(BX201600132)
中国博士后科学基金面上项目(2018M632461)
河北省在读研究生创新能力培养项目(CXZZSS2018030)
河北省高等学校科学技术项目(QN2016193)资助
关键词
PWM变频器
正常/故障漏电流
分布电容
永磁同步电机
PWM inverter
normal/fault leakage current
distributed capacitance
permanent magnet synchronous motor (PMSM)
