Patent ID: 6850425

Claim:
A parallel inverter system comprising: a plurality of inverters of an instantaneous voltage control type each having an instantaneous voltage controller and a current minor loop coupled to said instantaneous voltage controller for receiving a current command; an output bus for connecting outputs of said plurality of inverters to a load; an active power bus for connecting to said plurality of inverters so as to provide an active power sharing reference generated from active power references of said plurality of inverters and through said active power bus; a phase bus for connecting to said plurality of inverters so as to provide a system phase reference generated from phase references of said plurality of inverters and through said phase bus; and controlling devices for controlling sinusoidal wave references of said plurality of inverters to have the same phase, the reactive power, and the active power responsive to said active power sharing reference and said system phase reference; wherein a plurality of discrepancies between said outputs and said sinusoidal wave references of said plurality of inverters are corrected by said instantaneous voltage controllers and said current minor loops of said plurality of inverters.