A control method and device for suppressing left and right vibration of a tower of a wind power generating set

Abstract

The invention discloses a control method and device for inhibiting the side-to-side vibration of a tower of a wind generating set. The method comprises the following steps: obtaining a side-to-side acceleration am of the tower, and performing error elimination treatment on the side-to-side acceleration am of the tower to obtain an error-eliminated acceleration ac; performing integral computation and filtering treatment on the acceleration ac to obtain a speed VN corresponding to the first-order inherent frequency omega of the tower; performing filtering treatment on a measured generator speed Omegam, and then performing proportional-integral adjustment to obtain a generator speed OmegaN corresponding to the first-order inherent frequency omega of the tower, and an output torque TPI; calculating a compensation torque coefficient Kb from the output torque TPI and the previous-cycle compensation torque Tb* according to the generator speed Omegam; and calculating a total compensation electromagnetic torque Tb from the Kb and the OmegaN by use of the VN, and inputting the sum of the Tb and the TPI into the wind generating set as a control signal for power control. According to the method, the impact of the compensation torque on the output power is reduced, and the control effect on inhibiting the side-to-side vibration of the tower is improved.

Description

technical field [0001] The invention relates to the technical field of control of wind power generators, in particular to a control method and device for suppressing left and right vibration of a tower of a wind power generator. Background technique [0002] As the unit capacity of wind turbines gradually increases, the size and weight of the towers of the wind turbines increase, resulting in a decrease in the natural frequency. At the same time, the diameter of the wind rotor of the unit is getting larger and larger, and the operating speed and range of the unit are getting smaller and smaller. Under the interlaced development of these factors, the probability of cross-resonance between the natural frequency of the tower and the excitation frequency of the unit operation is increasing. Therefore, considering the overall performance of the unit, cost and other factors, a control method for suppressing resonance in the natural frequency range of the tower is needed. [0003]...

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Problems solved by technology

[0004] However, the compensation torque used to offset tower resonance in this method will affect the power output quality, and how to reduce the impact of the compensation torque on power output needs to be solved urgently

Moreover, this method does not perform error elimination processing on the acceleration signal, which is prone to cumulative deviation, and the obtained additional torque is likely to deviate from the desired value, thereby reducing the control effect, and even causing problems such as insufficient power output or power over-delivery.

[0005] At the same time, this method controls the vibration of the tower with parameters set at the beginning of the design. When the frequency changes, such as offshore wind turbines, the frequency of the tower is different due to factors such as different foundation geology and different piling depths. The set parameters cannot Automatic adjustment, causing the control target to deviate, thereby reducing the control effect

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