Grid-connected hybrid-driven variable-pitch variable-speed constant-frequency wind turbine generator set

The invention provides a grid-connected hybrid-driven variable-pitch variable-speed constant-frequency wind turbine generator set which is developed against two popular types of direct-driven type and double-feed type in China presently. The grid-connected hybrid-driven variable-pitch variable-speed constant-frequency wind turbine generator set consists of an impeller system, a transmission system, a support system, a yaw system, a hydraulic system, a temperature control system and an electrical system, wherein the impeller system is directly connected with a flange of a planet carrier of a speed increasing box of the transmission system, and comprises three blades, a wheel hub and a variable-pitch control unit, a casing of a stator of a generator of the transmission system and a casing of an inner gear ring of the speed increasing box are respectively fixed on a rotary support of a support system by the way of a front flange and a back flange, and the generator is a synchronous permanent magnet generator. The grid-connected hybrid-driven variable-pitch variable-speed constant-frequency wind turbine generator set adopts a primary planetary gearbox and the low-speed permanent magnet synchronous generator, thereby having the advantages of small volume, simple structure, fewer maintenance items of the set, low maintenance cost, no need of special hoisting equipment, sufficient space for meeting the requirements of maintenance and ergonomics, and optimal maintainability of all the parts.