Wind turbine braking system and braking method

Abstract

The invention provides a braking system and a braking method using the braking system. The braking system and the braking method can improve the effective utilization rate of a wind driven generator and reduce risks caused by the impact to the whole braking system. The braking system comprises a generator, a mechanical braking portion, an electromagnetic braking portion and a controller, wherein the generator is used for converting rotating kinetic energy of a wind wheel into electric energy and outputting the electric energy through a three-phase armature winding, the mechanical braking portion is used for braking the generator in a mechanical mode, the electromagnetic braking portion conducts electromagnetic braking by causing a short circuit of the three-phase armature winding of the generator, and the controller is used for controlling the mechanical braking portion and the electromagnetic braking portion. The braking system further comprises a current detection portion which is used for detecting a current value of any phase of the three-phase armature winding and providing the detected current value for the controller.

Description

technical field [0001] The invention relates to the field of wind power generators, in particular to a braking system and a braking method for a wind power generator. Background technique [0002] As a clean renewable energy, wind energy has huge reserves, and the use of wind power to generate electricity has attracted more and more attention from all over the world. The principle of wind power generation is to use the wind to drive the wind wheel to rotate, convert the kinetic energy of the wind into rotational kinetic energy, and then convert the rotational kinetic energy into electrical energy through the wind generator, and then output the electrical energy for use by electrical equipment. In a wind power generation system, when the wind is strong, the wind turbine will output a voltage exceeding the rated value due to the excessive speed of the wind rotor, and the high output voltage may damage the electrical equipment, so for the wind turbine It can be said that the b...

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Problems solved by technology

In this way, the overspeed of the fan, the overvoltage of the circuit, the wear of the brake disc, the vibration of the wind turbine, etc. will have a great impact on the entire system, which will affect the reliability, stability and life of the wind turbine and the entire system.

[0007] It can be seen from this that in the case of long-term strong winds in the existing braking devices and braking methods, not only the wind generator cannot generate electricity, but the brake discs continue to consume power, which makes the effective utilization of clean energy low, and because the fan speeds too fast the risk of a shock to the entire system

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