基于占空比调制的永磁同步电机直接转矩控制

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Abstract In order to solve the problems of traditional direct torque control(DTC) such as high torque ripple,high stator flux ripple and inconstant switching frequency,a model predictive direct torque control(MPDTC) strategy based on duty ratio modulation is proposed in this paper. The mathematical models of torque and stator flux slopes are presented,and the duty ratio of the selected voltage vector is determined according to the total errors of torque and stator flux. Three different methods to determine the duty ratio are presented based on different control objectives,namely DRM-final,DRM-mean and DRM-rms. The mathematical models are presented and the comparative evaluation is conducted through numerous criteria. Considering the control delay in practical application,model predictive control(MPC) is employed to predict the machine variables. Hence,the desired voltage vector and its duty ratio can be obtained one sampling interval ahead. The simulation results indicate that the torque ripple and stator flux ripple are reduced under the control strategy proposed while the switching frequency stays constant and the sampling frequency is also reduced.

Key words： Permanent magnet synchronous machine(PMSM) direct torque control(DTC) duty ratio modulation(DRM) model predictive control(MPC)

Received: 16 September 2013 Published: 22 January 2015

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TM351

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	Niu Feng
	Li Kui
	Wang Yao

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Niu Feng,Li Kui,Wang Yao. Model Predictive Direct Torque Control for Permanent Magnet Synchronous Machines Based on Duty Ratio Modulation[J]. Transactions of China Electrotechnical Society, 2014, 29(11): 20-29.

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http://dgjsxb.ces-transaction.com/EN/ OR http://dgjsxb.ces-transaction.com/EN/Y2014/V29/I11/20

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