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 anddouble-
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 ofan 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 magnetsynchronous 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.