Adaptive harmonic distortion control for parallel connected inverters

摘要

A control for an inverter system having first and second inverters that produce inverter outputs wherein the inverter outputs are combined by an interphase transformer (IPT) to produce an AC output includes circuitry for detecting a magnitude of a harmonic component in the AC output waveform and circuitry for developing first and second PWM control waveforms for controlling the first and second inverters, respectively. The second PWM control waveform is phase delayed relative to the first PWM control waveform to in turn regulate the magnitude of the harmonic component and DC content across the IPT is controlled to prevent damage to the IPT.