Open AccessNew Eighteen-sector Direct Torque Control Based on Duty Ratio Modulation
Author(s) -
Zhonghao Wu,
Jiemin Zhou,
Gang Zheng,
Tao Li,
Zihan Zhu
Publication year - 2020
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1449/1/012033
Subject(s) - direct torque control , flux linkage , control theory (sociology) , torque ripple , duty cycle , stator , vector control , torque , stall torque , torque limiter , damping torque , inverter , voltage , engineering , computer science , physics , induction motor , control (management) , electrical engineering , artificial intelligence , thermodynamics
In the traditional direct torque control (DTC) of permanent magnet synchronous motor (PMSM) system, the ripple of stator flux linkage amplitude and electromagnetic torque at the steady state is large. The unbalanced effect of active voltage vectors on stator flux linkage and torque control is analysed. Based on the idea of sector subdivision, combined with the six new active voltage vectors added by the three-level inverter, a new eighteen-sector DTC method is proposed to improve the control effect of voltage vectors. For the overcompensation problem caused by the voltage vector acting in a whole sampling period in DTC, the duty ratio modulation (DRM) method is used to reduce the torque ripple. Compared with the traditional DTC, the effectiveness of the proposed new control strategy for reducing the ripple of stator flux linkage and electromagnetic torque is verified.