Journal of Power Electronics

The Korean Institute of Power Electronics (전력전자학회)
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Robust Time Delay Compensation for DTC-Based Induction Machine Systems via Extended State Observers

  • Wang, Fengxiang (Quanzhou Institute of Equipment Manufacturing, Haixi Institute, Chinese Academy of Sciences) ;
  • Wang, Junxiao (College of Information Engineering, Zhejiang University of Technology) ;
  • Yu, Li (College of Information Engineering, Zhejiang University of Technology)
  • Received : 2017.10.31
  • Accepted : 2018.02.03
  • Published : 2018.05.20
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Abstract

This paper presents an extended state observer (ESO) based direct torque control (DTC) for use in induction motor systems to handle the issues of time delays, load torque disturbances and parameter uncertainties. Direct torque control offers an excellent torque response and it does not require a proportion integration (PI) controller in the current loop. However, a PI controller is still adopted in the outer speed loop to generate the torque reference value, which is a slow method. An ESO based compound control scheme is proposed to improve the response rate and accuracy of the torque reference signal, especially when load torque is injected. In addition, the time delay problem is analyzed and compensated for in this paper to reduce torque ripples. The proposed disturbance compensation technique based direct control scheme is shown to have good performance both in the transient and stable states via simulations and experimental results.

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References

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