Abstract
Direct torque control (DTC) and model predictive control (MPC) are widely used in the control of permanent magnet synchronous motor (PMSM). However, DTC for PMSM can cause large torque ripples and flux ripples, high harmonic distortion of the stator current, and high acoustic noises. Compared to DTC, MPC considers all possible switching states which can reduce the ripples of torque and flux. MPC with one-step delay compensation for PMSM and DTC with one-step delay compensation and two hysteresis comparators for PMSM have been proposed to solve some drawbacks of these two controllers. This paper makes a detailed comparison between these two improved control methods through Simulink and hardware experiments results to analyse the four indicators-torque ripple, flux ripple, transient time and THD of inverter current.
Highlights
Permanent magnet synchronous motor (PMSM) has widely used in industrial markets with the advantages of high efficiency, high reliability, high power density, high power factor, and high torque to current ratio with small size [1]
In order to overcome these disadvantages, model predictive control (MPC) is introduced to PMSM drive system. The theory of it was raised in the 1970, MPC was applied for PMSM in last decade [4,5,6]
This paper gives the details of modified direct torque control (DTC) algorithms for PMSM and modified MPC algorithms for PMSM and compares the performance of both methods in simulation and experiment respectively
Summary
Permanent magnet synchronous motor (PMSM) has widely used in industrial markets with the advantages of high efficiency, high reliability, high power density, high power factor, and high torque to current ratio with small size [1]. In 1997, the direct torque control (DTC) was applied to permanent magnet drive [2,3]. Conventional DTC still has some drawbacks, such as large torque and flux ripples, high current harmonic distortion, and high sampling frequency due to hysteresis-based scheme. In order to overcome these disadvantages, model predictive control (MPC) is introduced to PMSM drive system. This paper gives the details of modified DTC algorithms for PMSM and modified MPC algorithms for PMSM and compares the performance of both methods in simulation and experiment respectively. The mathematical model of PMSM is introduced in the section 2. The details of DTC algorithm and MPC algorithm for PMSM are described in section 3 and section 4 respectively.
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