Wind turbine system

A wind turbine system, comprising:

• a nacelle;
• a generator, disposed in the nacelle;
• a central control module, disposed in the nacelle, receiving a first speed signal of the generator, and outputting a corresponding first pitch command;
• an impeller, having a hub and at least one blade connected to the hub;
• a transmission module, connected between the generator and the impeller;
• a speed sensor module disposed in the hub, sensing a rotation speed of the hub, and outputting a corresponding second speed signal;
• at least one pitch angle driving module, wherein each blade is connected to one or plural of the at least one pitch angle driving module;
• and
• a hub controller, disposed in the hub, and coupled to the speed sensor module and the pitch angle driving module, the hub controller being adapted to receive the first pitch command and determine whether the first pitch command is correct, wherein when the first pitch command is correct, the hub controller transmits the first pitch command to the pitch angle driving module for the pitch angle driving module to control a pitch angle of the at least one blade, and when the first pitch command is incorrect, the hub controller calculates a second pitch command according to the second speed signal and transmits the second pitch command to the pitch angle driving module, and the pitch angle driving module controls the pitch angle of the at least one blade.