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http://dx.doi.org/10.1007/s43236-021-00345-2

Improved duty cycle modulation direct torque control for dual three-phase PMSM with voltage vector online optimization  

Zhang, Kai (School of Electrical Information Engineering, Jiangsu University)
Quan, Li (School of Electrical Information Engineering, Jiangsu University)
Liu, Gai (School of Electrical Information Engineering, Jiangsu University)
Publication Information
Journal of Power Electronics / v.22, no.2, 2022 , pp. 222-233 More about this Journal
Abstract
In this paper, an improved duty cycle modulation direct torque control is proposed for dual three-phase permanent-magnet synchronous machine, which aims to restrain current harmonics and reduce the ripples of torque and flux linkage. First, to restrain the current harmonics, 12 virtual voltage vectors (VVs) are employed as candidate vectors. Then, according to the deviations of torque and flux, the potential voltage vector set can be selected from the 12 virtual VVs. A cost function is employed to determine the optimal VV from the potential vector set. Next, the concept of torque deadbeat is applied to determine the duty cycle of VV and achieve the accurate adjustment of torque and flux linkage. This proposed method effectively reduces the torque and flux ripples and current harmonic. The simple structure of the conventional DTC is retained. The simulation and experimental results verify the effectiveness of the proposed method.
Keywords
Direct torque control; Virtual voltage vector; Duty cycle; Dual three-phase permanent-magnet synchronous machine;
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