Abstract: Non-linear frequency droop control for isochronous frequency operation of parallel inverters includes generating a droop constant corresponding to the power level of the given inverter for maintaining the predetermined frequency range of the given inverter; generating the droop from the given inverter power level and the droop constant and calculating in response to the droop, the incremental shift in the output voltage waveform of a given inverter operating in a predfreytermined limited frequency range to enable current sharing among the inverters.