A Duty Cycle Space Vector Modulation Strategy for a Three-to-Five Phase Direct Matrix Converter

Rutian Wang,Chuang Liu,Xiwen Gao,Xue Wang

doi:10.3390/en11020370

Rutian Wang, Chuang Liu + Show 2 more

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https://doi.org/10.3390/en11020370

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Abstract

The duty cycle space vector (DCSV) modulation strategy is of universal significance, and the method can be utilized for different modulation approaches. In this paper, the vectors of input voltages and currents are equivalently represented by a complex two-dimensional space vector, and the vectors of output voltages and currents are equivalently represented by two two-dimensional space vectors. Then, input–output relationships in both the d1-q1 space and the d3-q3 space are obtained. Because the desired output voltages are only mapped onto a reference voltage space vector in the d1-q1 space, the reference in the d3-q3 space is regarded as zero, in order to reduce harmonics of output voltages to the greatest extent. Then, the duty cycle space vector modulation strategy of the three-to-five phase direct matrix converter (DMC) is deduced. Considering the influence of the zero vector on system performance, the duty cycles are decomposed and recomposed to obtain the space vector pulse width modulation (SVPWM) strategy based on the duty cycle space vector. Finally, the accuracy and feasibility of the theory are verified through experiments.

Highlights

Multiphase drive systems involving more than three phases have been receiving increasing attention because of their inherent advantages over the traditional three-phase motor drives.They reduce the amplitude and increase the frequency of torque pulsations, reduce the rotor harmonic current losses, reduce the current per phase without increasing the voltage per phase, and lower the DC link current harmonics [1,2,3,4]
The expression of five duty cycle vectors at any moment is described by Equation (22)
The general expression of the turn-on time of each switch was obtained. This method is of universal significance as it canan realize different modulation strategies through suitable use of the zero configurations

Summary

Introduction

Multiphase drive systems involving more than three phases have been receiving increasing attention because of their inherent advantages over the traditional three-phase motor drives. They reduce the amplitude and increase the frequency of torque pulsations, reduce the rotor harmonic current losses, reduce the current per phase without increasing the voltage per phase, and lower the DC link current harmonics [1,2,3,4]. It has become a focus of research in the field of power transmission and conversion due to its excellent performance. Modulation strategies become more complex due to the increasing number of output phases

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Discussion

Conclusion