Eliminating the Effect of Common-Mode Voltage on an Open-End Winding PMSM Based on Model Predictive Torque Control

Zhiming Lin,Pan Mei,Lingwei Wu,Bicheng Lei

doi:10.1155/2021/5516290

Zhiming Lin, Pan Mei + Show 2 more

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https://doi.org/10.1155/2021/5516290

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In the open-end winding permanent magnet synchronous motor (OEW-PMSM) with common DC link, the common-mode voltage (CMV) will cause leakage current and zero-sequence current, which will lead to the decrease in the system life and efficiency. To solve this problem, the loop characteristics of leakage current and zero-sequence current were analyzed, and the condition for eliminating the leakage current and the zero-sequence current was deduced. Then, the CMV of the voltage vectors for the OEW-PMSM system was calculated, and the appropriate voltage vectors satisfying the conditions were selected to form the control vector sets. Combined with the model predictive torque control (MPTC), a cost function without the weight factor was proposed. The voltage vector sets were predicted by the cost function. The optimal voltage vectors were selected to control the OEW-PMSM, which can eliminate the leakage current and the zero-sequence current caused by the CMV. The effectiveness of the proposed method was verified by the simulation results.

Highlights

Due to the advantages of high power, more voltage vectors, and high fault tolerance, open-end winding (OEW) motors have attracted wide attention in high-power, large-capacity, and vehicle applications [1,2,3,4]
Erefore, zero-sequence current (ZSC) and leakage current caused by common-mode voltage (CMV) should be eliminated in the system
For the OEW-PMSM system with common DC link, a model predictive torque control (MPTC) method is proposed to eliminate the zero-sequence current and the leakage current caused by CMV

Summary

Introduction

Due to the advantages of high power, more voltage vectors, and high fault tolerance, open-end winding (OEW) motors have attracted wide attention in high-power, large-capacity, and vehicle applications [1,2,3,4]. Based on the principle of volt-second, Kalaiselvi and Srinivas [12] proposed a hybrid PWM switching method to reduce CMV and leakage current for the OEW system. All these methods have a vector modulation process, which is complex. Mathematical Problems in Engineering aluminium films are added between the stator and the rotor to prevent leakage current caused by CMV in [19] A method to simultaneously eliminate the influence of CMV on ZSC and leakage current in the OEW-PMSM is proposed in this paper.

Voltage Vector Selection

Model Predictive Torque Control

Conclusions