Abstract
When the wind turbine hydraulic yaw system brake and pressure relief, hydraulic oil pressure in the hydraulic system is rapidly reduced, and its direction of flow has also undergone dramatic change. Hydraulic impact generated easily make equipment failure by mutations pressure in pipeline. For there is the larger hydraulic impact problem when hydraulic yaw brake system change direction, this paper has analyzed the reasons resulting hydraulic impact, and has established the mathematical model of the yaw brake system pressure relief oil passage, and then has proposed to the methods of reducing the hydraulic impact in the commutation process. The simulation results show that the methods of extend the hydraulic cylinder commutation time may well reduce the hydraulic impact when the wind turbine hydraulic yaw system brake and pressure relief. It has significantly changed its pressure curve. It can reduce the hydraulic impact damage to the equipment. Then it verify the feasibility of this method.
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