Patent ID: 8488345

Claim:
A power conversion system comprising: an inverter comprising a plurality of AC terminals for supplying AC electrical power to a load, and a switching network comprising a plurality of switching devices individually operable according to a corresponding inverter switching control signal; and a switch control system comprising: a pulse width modulation system operative to provide the inverter switching control signals by pulse width modulation at least partially according to a carrier waveform and a set of phase signals or values individually corresponding to a load phase associated with one of the AC terminals of the inverter, the carrier waveform having a carrier period and a carrier waveform range extending from a carrier maximum value to a carrier minimum value, the phase signals or values being determined based on at least one setpoint signal or value and on feedback signals or values individually corresponding to voltages or currents of the load phases, and an over-modulation compensation component operative in a given pulse width modulation period to selectively adjust at least one phase signal or value to provide a set of over-modulation compensated phase signals or values if at least one of the phase signals or values is transitioning into or out of an over-modulation range outside the carrier waveform range in a current sample cycle, and to provide the set of over-modulation compensated phase signals or values to the pulse width modulation system to provide the inverter switching control signals by pulse width modulation according to the set of over-modulation compensated phase signals or values.