Active load reduction control method of wind generating set based on external wind condition

Abstract

The invention discloses an active load reduction control method of a wind generating set based on an external wind condition. The method comprises the following steps that (1) by processing the wind speed and the real-time wind speed and wind direction collected by a wind indicator, the wind condition severity degree coefficient is output; (2) by processing the real-time tower front-back vibrationand left-right vibration collected by a vibration sensor, the vibration severity degree coefficient is output; (3) the maximum power setting value of the set is output by means of the wind conditionseverity degree coefficient obtained through wind condition evaluation and calculation and by means of the vibration severity degree coefficient obtained through vibration evaluation and calculation;and (4) a maximum power setting value of the set is defined at the setting value output in the step (3), so that the generated power of the set is reduced, and the active load reduction of the set isrealized. By means of the method, the generated power of the set is actively reduced, so that the wind load on an impeller face is reduced, the tower vibration degree is finally reduced, and then thegenerated power amount loss caused by unnecessary shutdown inspection is avoided.

Description

technical field [0001] The present invention relates to the technical field of load shedding control of wind power generators, in particular to an active load shedding control method for wind power generators based on external wind conditions. Background technique [0002] There are fewer and fewer high-quality wind farm resources with flat terrain and high annual average wind speed. More and more wind farms are built in mountainous areas with complex terrain, and the wind conditions are much worse than those of plain wind farms. When the unit is operating in such a working condition with large changes in wind speed and wind direction, the stability of the unit will decrease. The vibration amplitude of the tower is an important indicator to measure the stability of the unit. When the vibration sensor monitors the vibration amplitude of the tower When the unit safety threshold is exceeded, the unit will be triggered to shut down due to failure. Because the vibration amplitud...

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Problems solved by technology

[0003] 1. The hardware of the unit is abnormal: if there is a large damage or fracture of the blade, the wind load on the impeller surface is unbalanced and the vibration of the tower exceeds the limit.

[0004] 2. The control strategy of the unit is abnormal: if the pitch control loop is unstable, the pitch mechanism executes abnormal pitch commands and the vibration of the tower exceeds the limit

[0005] 3. The external wind conditions are bad: such as the wind speed and wind direction change rapidly in a short period of time, resulting in the extreme change of the wind load on the impeller surface and the vibration of the tower exceeding the limit

[0006] The first and second reasons for the above-mentioned 3 points that lead to the vibration of the unit tower exceeding the limit are that it is really necessary to stop the machine for troubleshooting. It is said that the shutdown is for safety protection, not the failure of the unit

In the actual operation of the unit, more than 90% of the vibration failures are caused by bad external wind conditions. Therefore, how to avoid the stable operation of the unit under severe wind conditions without triggering the tower vibration overrun shutdown of the unit has become a major wind turbine manufacturer. Research Hot Issues

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