基于单母线电流传感器的三相永磁同步电机驱动方法  

A Single DC-Link Current Sensor Drive Technology of Three-Phase Permanent Magnet Synchronous Motor

作　　者：郑晔明 张建忠[1] Zheng Yeming;Zhang Jianzhong(School of Electrical EngineeringSoutheast University,Nanjing 210096 China)

机构地区：[1]东南大学电气工程学院,南京210096

出　　处：《电工技术学报》2023年第19期5164-5175,共12页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金重点资助项目(51991384)。

摘　　要：该文研究基于单母线电流传感器的三相永磁同步电机驱动方法,无需使用相电流传感器而是通过单母线电流传感器重构三相电流信号,为消除母线电流传感器重构死区的影响,提出基于两步预测控制的三态脉宽调制方法,利用3个相邻的开关状态构建参考电压,通过两步预测计算下一个周期的参考电压,避免了逆变器多相桥臂同时动作。所提出的单母线电流传感器驱动方法具有共模电压峰-峰值低、电流谐波含量小、采样点固定的优点。最后,通过实验验证了重构电流的准确性和所提出驱动方法的有效性。In recent years,permanent magnet synchronous machine(PMSM)has been widely used in servo drive,rail transit,new energy power generation,and other fields for high power density,high efficiency,good reliability,and fast dynamic response.Three-phase PMSM drive systems usually require at least two phase current sensors to obtain accurate stator current signals.However,in harsh working conditions,the current sensor is prone to various faults or is affected by noise interference,resulting in inaccurate current signals collected.Inaccurate stator current feedback can cause the deterioration of the control performance.Therefore,this paper proposes a three-phase permanent magnet synchronous motor drive method based on a single DC-link current sensor,which reduces the number of current sensors in the drive system.Firstly,the method uses a PI regulator to control the motor speed,and uses the bus current signal and the inverter switching state to reconstruct the stator current as current feedback.The principle of stator current reconstruction is the series effect of DC-link current and three-phase current.Secondly,the method uses the two-step model prediction algorithm to obtain the reference voltage of the next cycle instead of the current cycle.In the current cycle,the control system can simultaneously obtain the reference voltage of the current cycle and the next cycle through the two-step predictive control.Finally,tristate pulse width modulation(TSPWM)selects the appropriate starting and ending voltage vector to modulate the reference voltage of the current cycle according to these two sets of the reference voltage.When the TSPWM selects the appropriate starting and ending voltage vector,the area of the stator current reconstruction dead zone is greatly reduced,and the reconstruction dead zone is all located at the edge of the sector.Therefore,TSPWM can effectively eliminate the influence of the reconstruction dead zone,a tricky problem of traditional space vector pulse width modulation.The simulation results show that t

关 键 词：永磁同步电机 母线电流传感器 预测控制 重构电流 三态脉宽调制 

分 类 号：TM341[电气工程—电机]