Method and system for adding resistance to transmission chain of variable speed wind turbine

Abstract

The invention discloses a method and system for adding resistance to a transmission chain of a variable-speed wind power generating set, wherein the method for adding resistance to a transmission chain of a variable-speed wind generating set includes: acquiring the high-speed shaft speed of the variable-speed wind power generating set; filtering to obtain the filtered rotational speed; performing phase compensation calculation on the filtered rotational speed to obtain the compensated rotational speed, and performing limit filtering on the compensated rotational speed; The electromagnetic torque before resistance is calculated to calculate the electromagnetic torque after resistance is added to the transmission chain. Therefore, adopting the method and system for adding resistance to the transmission chain of the variable-speed wind-driven generator set of the present invention can effectively increase the damping effect, eliminate system resonance, and reduce the axial load of the wind-driven generator set.

Description

technical field [0001] The invention relates to the field of wind power generation, in particular to a method and system for adding resistance to a transmission chain of a variable-speed wind power generating set. Background technique [0002] The mechanical transmission chain of a wind turbine (referred to as a wind turbine) refers to a transmission chain composed of a wind wheel, a hub, a main shaft, a gearbox, a high-speed shaft, a brake, and a coupling. Large impact, resulting in increased gearbox torque, causing damage and generating severe mechanical noise. In particular, the variable-speed wind turbine works in the mode of constant torque, with only a small damping. Since the torque no longer changes with the speed, the gearbox will have a large Torque oscillations, which in turn negate the theoretical advantages of variable speed operation and the ability to control torque. [0003] To this end, some mechanical damping needs to be artificially added to the transmis...

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Problems solved by technology

However, when the above-mentioned method is above the rated wind speed, it is impossible to increase the damping of the mechanical transmission chain, and it is prone to the problem of torsional oscillation of the unit, and the problem that the dynamic performance of the electromagnetic power of the generator will deteriorate under various test wind conditions

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