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| Analysis of Leakage Current in PWM Motor System |
| Niu Feng1,2,3, Cao Shiran1,2, Wang Yao1,2, Han Zhenduo1,2, Huang Xiaoyan3, Zhang Jian3, Li Kui1,2, Fang Youtong3 |
1. State Key Laboratory of Reliability and Intelligence of Electrical Equipment Hebei University of Technology Tianjin 300130 China;
2. Key Laboratory of Electromagnetic Field and Electrical Apparatus Reliability of Hebei Province Hebei University of Technology Tianjin 300130 China;
3. College of Electrical Engineering Zhejiang University Hangzhou 310027 China |
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Abstract 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.
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Received: 23 April 2018
Published: 05 May 2019
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2019, Vol. 34 
