Voltage vector duty cycle optimization strategy for direct model predictive control of PMSM
XU Yu-hao
QIAO She-juan
XIAO Hai-feng
LI Wen-zhen
Abstract：Combining the direct torque control and the model predictive control,the model predictive torque control for permanent magnet synchronous motor has the advantages of simple control and high dynamic response.However,there are two problems of voltage vector combination failure and complex duty-cycle calculation when multiple voltage vectors are applied during the control cycle to eliminate steady-state errors.This paper proposes a voltage vector duty cycle optimization strategy for direct model predictive control of permanent magnet synchronous motor,which improves the effectiveness of the operation time of dual voltage vector.Based on the principle of deadbeat control,the relationship between magnetic flux vector and voltage vector is derived.The control target is normalized to the reference voltage vector,and thus solving the problem of tuning weighting factor.Furthermore,the optimal voltage vector combination can be directly obtained by dividing the sub-regions of the sector.Finally,a sum and a ratio constraint conditions are proposed for the action time of voltage vectors based on the principle of vector synthesis.Therefore,the rationality of each voltage vector and the effectiveness of synthesized voltage vector are improved.The experimental results indicate that the proposed method has better steady-state performance and good dynamic performance than the traditional methods.
Keywords：model predictive controlpermanent magnet synchronous motorreference voltage vectorduration time
Publication Date：2025-12-30
Online Publishing Date：2026-03-05(First online date of this platform, not the publication date of the document)
Pages：9( 2468-2476 )