NOVELTY - The device (10) has a hybrid power generator (20) with a primary electrical generator (21) e.g. doubly-fed induction generator. A prime mover e.g. impeller (30), is mechanically coupled to the hybrid power generator for driving the hybrid power generator. An auxiliary electrical generator e.g. synchronous generator, is driven and activated when the prime mover is operated at a low rotation speed or at initial operating stage. The primary electrical generator is driven and activated when the rotation speed of the prime mover increases and reaches a predetermined value.    USE - Hybrid power-generating device for generating electricity by using wind power and hydro power (claimed) and solar power.    ADVANTAGE - The device is equipped with a doubly-fed induction generator (DFIG) and the synchronous generator, thus enhancing the performance and stability of the power grid, enhancing the reliability of the device, reducing the operating cost of the device, and increasing the performance of the device. The synchronous generator generates electricity in a wider speed range, thus reducing cut-in speed of the device for improving annual energy production of the device, and reducing average energy production cost of the device. The device effectively generates reactive power for assisting voltage recovery during faulted condition. The device acts as a stand for supplying electricity of specific voltage and frequency to the grid, and provides magnetizing current for the doubly-fed induction generator to generate power.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for a method for generating power for a hybrid power-generating device.    DESCRIPTION OF DRAWING(S) - The drawing shows a block diagram of a hybrid power-generating device.    Hybrid power generating device (10)    Hybrid power generator (20)    Primary electrical generator (21)    Impeller (30)    Blades (31)    Pitch drive system (32)    Transmission shaft (33)    Gear box (40)    Back-to-back pulse width modulation type power converter (60)    Grid-side power converter (62)