Four-Dimensional Space Vector PWM Strategy for Five-Phase Voltage Source Inverter

Abstract

For a five-phase motor with non-sinusoidal windings arrangement, the electromagnetic torque can be enhanced by injecting third harmonic current. This paper studies the driving system and the fundamental and third harmonic spaces of the five-phase motor with non-sinusoidal windings, proposing a four-dimensional space vector PWM strategy based on modulation function method. According to the relationship of duty circle and modulation function of the periodic midpoint, for a symmetric regular sampling method, the phase modulation function can be obtained. It greatly simplifies the computational complexity and the occupied storage space. To deal with saturation, it only needs to limit the duty cycle or the amplitude of modulation function, which eliminates the complex division operation. To verify the correctness of the proposed method, the simulation and experiment are conducted on MATLAB/Simulink and hardware-in-the-loop simulation platform of RT-LAB/dSPACE, respectively. Finally, the phase current of the motor is analyzed with Fast Fourier Transform (FFT), showing the third harmonic content is basically the same as the set value.