Six phase inverter topology and control algorithm research with boost function

Abstract

Multi-phase motors are widely used in electric vehicles, aerospace, ship traction and other important systems. Conventional six-phase voltage inverters have the limitation that they can only step down the voltage, with the maximum magnitude of the output line voltage being 0.5 times that of the direct current (DC) side voltage. In order to overcome this limitation and thus meet some special occasions where the output voltage is much higher than the input DC voltage, it is necessary to consider alternative solutions. This paper proposes a split-source inverter (SSI) impedance network for an asymmetric six-phase voltage source inverter with an improved four-vector SVPWM and carrier-based modulation (CBM) algorithm. Simulation and experimental results demonstrate that the inverter process of DC-AC (alternating current) boosting can be achieved under the same switching state, and that the output voltage level of the inverter is adjustable. Furthermore, the DC-side capacitor voltage exhibits a faster boosting speed and smaller fluctuation. The feasibility of the boost function of the six-phase voltage source inverter is demonstrated.