Dual-frequency Discontinuous Space Vector Pulse Width Modulation for Five-phase Voltage Source Inverters with Harmonic Injection

This paper proposes a dual-frequency discontinuous space vector pulse width modulation (DFDSVPWM) for a five-phase voltage source inverter with harmonic injection. In this modulation, for dual-frequency voltage output and reduction of switching losses, two different zero-vector-inserted modes are flexibly employed by alternatively using two types of zero vectors. Based on the comparison with continuous SVPWM, the idea and principle of the proposed DFDSVPWM are analyzed and an example of PWM signals for one bridge is also presented. For switching losses analysis, the impact factors and the calculation method are investigated and the corresponding implementation is given as well. The simulation and experimental results from a prototype verify the correctness and effectiveness of the proposed modulation and it has the advantages of outputting dual-frequency voltage and reducing switching losses.