PWM电机系统漏电流分析
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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.
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.
引文
[1]姜保军.PWM电机驱动系统传导共模EMI抑制方法研究[D].哈尔滨:哈尔滨工业大学,2007.
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[10]赵瑞广,刘栋良,崔丽丽,等.采用双共模内回路抑制非隔离光伏并网系统的共模电流的研究[J].电工技术学报,2016,31(22):186-193.Zhao Ruiguang,Liu Dongliang,Cui Lili,et al.Research of common-mode current suppression in non-isolated PV grid-connected system with double common-mode inner loops[J].Transactions of China Electrotechnical Society,2016,31(22):186-193.
[11]Emre Un,Ahmet M Hava.A near state PWM method with reduced switching frequency and reduced common-mode voltage for three-phase voltage source inverters[J].IEEE Transactions on Power Electronics,2009,45(2):782-793.
[12]Yen-Shin Lai,Fu-san Shyu.Optimal common-mode voltage reduction PWM technique for inverter control with consideration of the dead-time effects[J].IEEETransactions on Industry Applications,2004,40(6):1605-1620.
[13]Cacciato M,Consoli A,Scarcella G,et al.Reduction of common-mode currents in PWM inverter motor drives[J].IEEE Transactions on Industry Applications,1999,35(2):469-476.
[14]郭小强,贺冉,菅佳敏,等.非隔离型三相四桥臂光伏逆变器漏电流抑制研究[J].电工技术学报,2016,31(19):66-73.Guo Xiaoqiang,He Ran,Jian Jiamin.Leakage current reduction for three-phase four-leg photo-voltaic inverter[J].Transactions of China Electrotechnical Society,2016,31(19):66-73.
[15]郭小强,贾晓瑜.非隔离型级联H5光伏逆变器共模漏电流特性分析[J].电工技术学报,2018,33(2):361-369.Guo Xiaoqiang,Jia Xaoyu.Analysis of common mode leakage current for transformerless cascaded H5 PV inverter[J].Transactions of China Electrotechnical Society,2018,33(2):361-369.
[16]熊晓祎,肖先勇,赵恒.基于自适应算法的触电事故电流检测[J].电力系统保护与控制,2017,45(4):139-144.Xiong Xiaoyi,Xiao Xianyong,Zhao Heng.Adaptive algorithm based electrical shock current detection method[J].Power System Protection and Control2017,45(4):139-144.
[2]刘威峰.变频驱动电动机轴承电流问题研究[D].沈阳:沈阳工业大学,2014.
[3]裴雪军.PWM逆变器传导电磁干扰的研究[D].武汉:华中科技大学,2004.
[4]Oliver Magdun,Andreas Binder.High-frequency induction machine modeling for common mode current and bearing voltage calculation[J].IEEETransactions on Industry Applications,2014,50(3):1780-1790.
[5]Ogasawara S,Akagi H.Modeling and damping of high-frequency leakage currents in PWM inverter-fed AC motor drive systems[J].IEEE Transactions on Industry Applications,1996,32(5):1105-1114.
[6]Jih-sheng Lai,Huang Xudong,Chen Shaotang,et al EMI characterization and simulation with parasitic models for a low-voltage high-current AC motor drive[J].IEEE Transactions on Industry Applications,2004,40(1):178-185.
[7]Mutoh N,Ogata M.New methods to control EMInoises generated in motor drive systems[J].IEEETransactions on Industry Applications,2004,40(1):143-152.
[8]Akagi H,Tamura S.A passive EMI filter for eliminating both bearing current and ground leakage current from an inverter-driven motor[J].IEEETransactions on Power Electronics,2006,21(5):1459-1469.
[9]Hirofumi Akagi,Ryota Kondo.A transformerless hybrid active filter using a three-level pulsewidth modulation(PWM)converter for a medium-voltage motor drive[J].IEEE Transactions on Power Electronics,2010,25(6):1365-1374.
[10]赵瑞广,刘栋良,崔丽丽,等.采用双共模内回路抑制非隔离光伏并网系统的共模电流的研究[J].电工技术学报,2016,31(22):186-193.Zhao Ruiguang,Liu Dongliang,Cui Lili,et al.Research of common-mode current suppression in non-isolated PV grid-connected system with double common-mode inner loops[J].Transactions of China Electrotechnical Society,2016,31(22):186-193.
[11]Emre Un,Ahmet M Hava.A near state PWM method with reduced switching frequency and reduced common-mode voltage for three-phase voltage source inverters[J].IEEE Transactions on Power Electronics,2009,45(2):782-793.
[12]Yen-Shin Lai,Fu-san Shyu.Optimal common-mode voltage reduction PWM technique for inverter control with consideration of the dead-time effects[J].IEEETransactions on Industry Applications,2004,40(6):1605-1620.
[13]Cacciato M,Consoli A,Scarcella G,et al.Reduction of common-mode currents in PWM inverter motor drives[J].IEEE Transactions on Industry Applications,1999,35(2):469-476.
[14]郭小强,贺冉,菅佳敏,等.非隔离型三相四桥臂光伏逆变器漏电流抑制研究[J].电工技术学报,2016,31(19):66-73.Guo Xiaoqiang,He Ran,Jian Jiamin.Leakage current reduction for three-phase four-leg photo-voltaic inverter[J].Transactions of China Electrotechnical Society,2016,31(19):66-73.
[15]郭小强,贾晓瑜.非隔离型级联H5光伏逆变器共模漏电流特性分析[J].电工技术学报,2018,33(2):361-369.Guo Xiaoqiang,Jia Xaoyu.Analysis of common mode leakage current for transformerless cascaded H5 PV inverter[J].Transactions of China Electrotechnical Society,2018,33(2):361-369.
[16]熊晓祎,肖先勇,赵恒.基于自适应算法的触电事故电流检测[J].电力系统保护与控制,2017,45(4):139-144.Xiong Xiaoyi,Xiao Xianyong,Zhao Heng.Adaptive algorithm based electrical shock current detection method[J].Power System Protection and Control2017,45(4):139-144.
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