Synchronous Balanced Control of Dual Split-Phase Drive Topology with PWM Diode-Clamped Inverters

Developed and modified control and modulation scheme, based on the application of the minimum number of voltage space vectors of four diode-clamped inverters, allows providing power balancing operation of asymmetrical six-phase (dual split-phase) system. Set of control and modulation functions includes in this case specialized equations connecting coefficients of modulation of inverters and amplitudes of dc-voltages. Algorithms of the developed space-vector modulation insure symmetry of basic voltages of split-phase installation with required power sharing for any frequency ratio between the switching frequency and fundamental frequency of each converter of installation with four diode-clamped inverters, supplied by dc sources with both equal and unequal dc-voltages. The proposed control and modulation concepts have been verified by numerical simulations.