Tower drum resonance avoiding and crossing control method of wind turbine generator and wind turbine generator

Abstract

The invention discloses a tower drum resonance avoiding and crossing control method of a wind turbine generator and the wind turbine generator, and belongs to the field of wind turbine generator control. The tower drum resonance avoiding and crossing control method comprises the following steps of: monitoring wind wheel rotation frequency f, and comparing the wind wheel rotation frequency f with apreset rotation speed resonance region; setting the rotation speed resonance region as follows: setting a rotation speed resonance region according to inherent frequency ft of a tower drum, wherein the rotation speed resonance region comprises rotation speed lower limit, rotation speed upper limit and a rotation speed area between the rotation speed lower limit and the rotation speed upper limit;and converting ft into rotation speed St, wherein the size of the rotation speed St is within a range from the rotation speed lower limit value Sm and the rotation speed upper limit value Sx; and when the wind wheel rotation frequency is within the rotation speed resonance region, controlling wind wheel rotation speed to quickly rise or drop to pass through the rotation speed resonance region according to a current state of the wind turbine generator. A rotation speed resonance region is set near a crossed joint of wind wheel rotation speed and tower drum inherent frequency, reasonable rotation speed resonance region upper and lower limits are set, and the rotation speed of the wind turbine generator is controlled to quickly rise or drop, so that the wind turbine generator passes throughthe rotation speed resonance region, and therefore, the tower drum resonance problem is solved.

Description

Technical field [0001] The invention relates to the field of wind power generator control, in particular to a wind power generator tower tube resonance avoidance crossing control method and a wind power generator. Background technique [0002] With the enlargement of wind turbines, the tower height is also increasing. When the tower height is greater than 100m, the weight increases geometrically with the increase in height, which greatly increases the design cost of the wind turbine. On the one hand, in order to save design costs, tall and light towers are designed during the design. Compared with ordinary towers, this type of tower has a lower frequency. On the other hand, since the rotation direction of the wind wheel is the same as the left and right vibration direction of the tower, when selecting the working range of the wind wheel rotation frequency of the power unit, it is necessary to avoid the natural frequency of the tower to avoid resonance of the tower. This leads t...

AI Technical Summary

Problems solved by technology

Since the speed of the upwind-type horizontal axis variable speed fan changes continuously along the optimal tip speed ratio curve below the rated wind speed, when the impeller rotates, there is an force between the impeller and the fan tower due to aerodynamic influence. If a certain speed The force frequency of the lower wind wheel is consistent with the natural frequency of the tower, and resonance will occur, resulting in damage or even toppling of the fan

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