Hydraulic system for wind mill generator is used to perform pitch-control and brake-control, featured by its strong drive-force, prompt response and stable operation. It takes an important role in the whole system. Basic on the introduced technologies, and cooperated with large-sized domestic wind mill generator producer, we developed the megawatt wind mill generator hydraulic system individually. It can perform precise pitch-control on wind mill generator blade, and perform yaw brake control and main shaft brake control. This system consists of a set of hydraulic station, a unit of machinery space accumulators, three units of nave accumulators, three sets of control oil cylinders and three sets of security oil cylinders, a set of locking oil tank and a set of rotary joints.
Considering that the north part of China is full of wind resource, we developed low-temperature type wind mill generator hydraulic system, which can work under -30°C, which have passed the low temperature testing of Shanghai Quality testing centre