Modified Algorithms of Synchronized PWM for Six-Phase Traction Drive with Two DC Sources

This paper presents description of peculiarities of operation (under specific control strategy) of multi-inverter six-phase drive with open-end windings, spatially shifted by 30 electric degrees. The control of four inverters of this system is based on the use of special switching sequences, allows insuring cancellation of common-mode voltage. In this case it is possible to use only two insulated dc sources in this multi-inverter topology. Symbiosis of specific control scheme with algorithms of synchronized space-vector modulation ensures voltage waveform symmetries during entire control range for any operation conditions of systems.