Journal of Power Electronics

The Korean Institute of Power Electronics (전력전자학회)
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Low Parameter Sensitivity Deadbeat Direct Torque Control for Surface Mounted Permanent Magnet Synchronous Motors

  • Zhang, Xiao-Guang (Inverter Technologies Engineering Research Center of Beijing, North China University of Technology) ;
  • Wang, Ke-Qin (Collaborative Innovation Center of Key Power Energy-Saving Technologies in Beijing, North China University of Technology) ;
  • Hou, Ben-Shuai (Collaborative Innovation Center of Key Power Energy-Saving Technologies in Beijing, North China University of Technology)
  • Received : 2017.04.23
  • Accepted : 2017.06.08
  • Published : 2017.09.20
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Abstract

In order to decrease the parameter sensitivity of deadbeat direct torque control (DB-DTC), an improved deadbeat direct torque control method for surface mounted permanent-magnet synchronous motor (SPMSM) drives is proposed. First, the track errors of the stator flux and torque that are caused by model parameter mismatch are analyzed. Then a sliding mode observer is designed, which is able to predict the d-q axis currents of the next control period for one-step delay compensation, and to simultaneously estimate the model parameter disturbance. The estimated disturbance of this observer is used to estimate the stator resistance offline. Then the estimated resistance is required to update the designed sliding-mode observer, which can be used to estimate the inductance and permanent-magnetic flux linkage online. In addition, the flux and torque estimation of the next control period, which is unaffected by the model parameter disturbance, is achieved by using predictive d-q axis currents and estimated parameters. Hence, a low parameter sensitivity DB-DTC method is developed. Simulation and experimental results show the validity of the proposed direct control method.

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References

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