Hydrostatic pressure variable pitch system and control method thereof

Abstract

The invention discloses a hydrostatic pressure variable pitch system and a control method thereof. The hydrostatic pressure variable pitch system comprises an energy storage module, a driver, a motor,a hydraulic pump, a valve block and an executing mechanism, wherein the energy storage module is connected to the driver so as to supply power to the driver; the driver is connected to the motor so as to drive the motor and control the operation of the motor; the motor is connected to the hydraulic pump so as to drive the hydraulic pump; the valve block is connected to the driver, the hydraulic pump and the executing mechanism; the driver controls the valve block to open and close; the hydraulic pump conveys hydraulic oil through the valve block so as to drive the executing mechanism; and theexecuting mechanism is connected to a variable pitch plate so as to drive the variable pitch plate to rotate. The system can have good stability and reliability, and is high in control efficiency andsafe to operate, and the space and the cost are saved.

Description

technical field [0001] The invention belongs to the field of wind power generation, and relates to a hydrostatic pressure variable pitch system and a control method thereof, and the system and method are used for pitch control of a wind power generating set. Background technique [0002] Energy is the main material basis of social economy and human life, and the driving force of social development. However, the reserves of non-renewable energy sources such as oil, coal, and natural gas, which are the main pillars of world energy, are decreasing day by day. At present, many countries are vigorously developing wind power generation. As a new energy source, wind power generation has gradually matured in scale. [0003] A wind turbine is a device that converts wind energy into electrical energy. In the pitch system of wind turbines, an electric scheme in which the blades are driven by an adjustable-speed motor through gears or toothed belts or an open hydraulic pitch system in...

AI Technical Summary

Problems solved by technology

[0004] In wind turbines with large megawatts and long blades, electric pitch is limited by the fatigue or ultimate strength of toothed belts or gears, and the response frequency is low

On the other hand, the traditional valve-controlled cylinder open hydraulic pitch system needs to integrate a large hydraulic station in the engine room and is equipped with consumable parts such as filters and rotary joints, and the energy storage method is limited to energy storage with low energy density. device

Images