Patent ID: 7518257

Claim:
A hybrid power-generating device, comprising: a back-to-back pulse-width modulation (PWM) power converter, further comprising: a rotor-side power converter, connected to the primary electrical generator's rotor: a grid-side power converter, connected to the electrical grid; a DC bus, disposed at a position between the rotor-side power converter and the grid-side power converter while having a voltage corresponding to the electrical grid; and an AC/DC power converter, connected to the auxiliary electrical generator's stator while connecting an output terminal thereof to the DC bus; a hybrid power generator, each further comprising: a primary electrical generator; and an auxiliary electrical generator, having characteristics different than those of the primary electrical generator while enabling the rated power of the auxiliary electrical generator to be smaller than that of the primary electrical generator; and a prime mover, mechanically coupled to the hybrid power generator for driving the same; wherein, as the prime mover is operating at a low rotation speed or at its initial operating stage, the auxiliary electrical generator is enabled to be driven and activated thereby; and as the rotation speed of the prime mover increases and reaches a predetermined value, the primary electrical generator is then being driven and activated thereby.