Simulation Study on Control Performance of PMSM-DTC under Different Switching Tables

doi:10.16182/j.issn1004731x.joss.201811039

Abstract

Abstract: In the motion system of permanent magnet synchronous motor (PMSM) under direct torque control (DTC), the inverter produces high-frequency common-mode voltage (CMV) based on the switching table when outputting voltage vectors, and its double-closed-loop Bang-Bang control structure also causes current harmonic distortion and high-frequency ripple of the torque. A simulation model is established for PMSM motion system under DTC based on Matlab/Simulink using different switching tables, where performance and CMV between 7 vectors and 6 vectors switching tables are compared respectively. The results demonstrate that both have similar dynamic performance; relative to 6 vectors switching table, 7 vectors switching table suppresses current harmonic distortion and non-fundamental frequency of torque spectrum better, while the CMV increases at the same time. The analysis results can serve as a reference for the choice of actual inverter output mode.

Key words: switching tables, PMSM, DTC, Common-mode voltage

CLC Number:

TM351

Luo Haoyuan, Yuan Dengke, Hu Zongjie. Simulation Study on Control Performance of PMSM-DTC under Different Switching Tables[J]. Journal of System Simulation, 2018, 30(11): 4375-4386.

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