Patent ID: 8027180

Claim:
A power generating apparatus comprising: an AC generator that has an n-phase (n is an integer equal to or larger than 1) armature winding and outputs AC voltage; an n-phase voltage source inverter that includes n-phase bridge-connected switch elements and feedback diodes antiparallel-connected to said respective switch elements, AC terminal sides of which are connected to output terminals of said AC generator, and in which a load and voltage accumulating means are connected in parallel between DC side terminals; and a controller that controls said inverter to invert voltage across said voltage accumulating means into control voltage of an AC waveform that has a frequency equal to that of said output voltage of said AC generator and has a predetermined phase angle with respect to a reference phase set in advance and apply said control voltage to said armature winding of said AC generator, said controller including said voltage accumulating means and control-voltage-phase controlling means for setting the voltage across said load as load voltage and controlling a phase of said control voltage to bring said load voltage close to a target value, wherein said controller includes voltage-phase detecting means and current-phase detecting means for detecting a phase of a phase voltage and a phase of a phase current of said AC generator, respectively, and said control-voltage-phase controlling means is comprised so as to perform, in order to bring said load voltage close to said target value, control for advancing the phase of said control voltage when said load voltage is higher than said target value, holding the phase of said control voltage in a present phase when said load voltage is equal to said target value, advancing the phase of said control voltage when said load voltage is lower than said target value and the detected phase of said phase voltage is delayed behind a phase of a phase current of a same phase, and delaying the phase of said control voltage when said load voltage is lower than said target value and the detected phase of said phase voltage is advanced ahead of a phase of a phase current of the same phase.