SPACE VECTOR PWM CONTOR OF FIVE-PHASE INVERTER

The space vector PWM (SVPWM) control of multi-phase inverter has more flexibility for the additional voltage vectors. According to vectors analyzing, the advantages of multi-phase inverter SVPWM control is presented in this paper. Two new SVPWM control methods for five-phase inverter are proposed comparing to the traditional Near Two Vectors SVPWM (NTV-SVPWM) control, and here they are called Near Four Vectors SVPWM (NFV-SVPWM) control and Minimum Switch Loss SVPWM (MSL-SVPWM) control. The target voltage functions and waveforms of three kind of SVPWM are deduced and compared. The conclusions can be drawn that there are much low frequency harmonics with NTV-SVPWM control, and which is not suitable for multi-phase inverter control; NFV-SVPWM has the best harmonics performance and is fit for low modulation index operation; MSL-SVPWM has the lowest switching loss and is fit for high modulation index operation. MATLAB is adopted to simulate the five-phase variable speed system, and the simulation results validate the conclusions above.