A method and device for controlling the speed of a wind power generator

Abstract

The invention discloses a method and a device of rotating speed control of a wind driven generator, and relates to the field of wind power generation. The method and the device aims to solve the problem that damage to the wind driven generator due to the fact that the wind power generator is stopped by overspeed when a wind condition is suddenly changed. The method of rotating speed control of thewind power generator comprises the steps that the wind speed is collected; if the wind speed increasing degree is larger than a first preset wind speed change threshold value, the electromagnetic torque of the wind driven generator is kept to be a fixed electromagnetic torque value, moreover, the target pitch angle value of the wind driven generator is increased, and paddle starting control is carried out according to the increased pitch angle value; if the wind speed diminishing degree is larger than a second preset wind speed change threshold value, the electromagnetic torque and the pitchangle of the wind driven generator are reduced, and a cutting-off electromagnetic torque value is calculated according to the real-time rotating speed of the wind driven generator; and if the difference value between a real-time electromagnetic torque value and the cutting-off electromagnetic torque value of the wind driven generator is smaller than the preset torque threshold value, the rotatingspeed control is carried out according to a preset rotating speed-pitch angle relation and a preset rotating speed-electromagnetic torque relation.

Description

technical field [0001] The invention relates to the field of wind power generation, in particular to a method and device for controlling the speed of a wind power generator. Background technique [0002] In the current situation of energy shortage, wind power, as a new energy source, has been widely used in various fields. Wind power generation is the use of wind generators to convert wind energy into electrical energy, and transmit the converted electrical energy to the grid, and then to various electrical equipment. [0003] The speed of the wind generator in the wind power generator is related to the size of the wind force. The wind power can be reflected in the wind speed. The greater the wind speed, the faster the blades of the wind power generator rotate, which drives the faster the speed of the wind generator in the wind power generator. In order to ensure The rotation speed of the wind turbine is stable, and the pitch angle needs to be adjusted to adjust the rotatio...

AI Technical Summary

Problems solved by technology

Due to the rapid change of wind speed, the pitch angle value calculated according to the previous moment is no longer suitable for the adjustment process of the next moment, and cannot effectively stabilize the speed of the wind turbine, which will cause the wind turbine to stop at an overspeed. It may even cause damage to wind turbines

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