Overmodulation control of five-phase inverters with full DC-bus voltage utilization

The paper presents novel strategy of synchronous control of five-phase inverters in the zone of overmodulation. New time-domain-based approach for analysis and synthesis of algorithms of synchronized pulsewidth modulation (PWM) allows providing smooth three-stage transition from a linear modulation region to the ten-step control mode of five-phase systems with space-vector modulation. Simulations give the behavior of five-phase inverters with synchronized PWM during overmodulation. The spectra of the phase-to-neutral voltage of five-phase power conversion systems with algorithms of synchronized PWM do not contain even harmonics and sub-harmonics in the zone of overmodulation, which is especially important for the high power/high current applications.