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Fang Xie,Houying Wang,Shilin Ni,Chaochen An 전력전자학회 2024 JOURNAL OF POWER ELECTRONICS Vol.24 No.2
In this paper, “Machine learning” is introduced to motor efficiency optimization control to improve the operating efficiency of the permanent magnet synchronous motors (PMSMs) for pure electric vehicles. A current distribution method based on the gradient boosting decision tree (GBDT) is proposed. The efficiency of the motor operation can be improved by coordinating the current control. First, a mathematical model of the motor efficiency is established, and the current distribution law of the optimal efficiency of the motor in different operating regions is qualitatively analyzed. The control system is based on this current distribution. Second, the sample space is established based on measured data, where the current regression model of the GBDT is introduced. Then by analyzing the importance of characteristic variables, the structure of the model is optimized, and the input and output of the model are reasonably selected, which are embedded into the control system to realize the coordinated control of the current. Finally, comparative experiment shows that the proposed method can improve the efficiency of PMSMs in the whole speed range.
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Xie Fang,Ni Shilin,Wang Houying 대한전기학회 2024 Journal of Electrical Engineering & Technology Vol.19 No.5
For improving the speed fl uctuation of permanent magnet synchronous motor under parameter variation and load disturbance, the control method based on double extended state observer (ESO) is introduced in the paper. Firstly, the defects of the traditional speed and current controller are analyzed, based on the speed mathematical model . The infl uence of the disturbance on the speed is also analyzed, where produces in the speed loop and current loop. And the improved motor robust control system is established. Secondly, the proportional ESO (PESO) of the dq-axes current loop is established. It accurately compensate the dq-axes output voltage error caused by the parameter changes. And the system stability is also proved. Thirdly, the anti-windup controller is introduced to improve the response lag of speed PI regulator. The time-varying parameter ESO of speed loop is established to reduce the infl uence on current output, which caused by parameter variation and load disturbance. Finally, the eff ectiveness of the proposed method are verifi ed by simulation and experiment results.
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