Method and device for detecting freezing of wind generating set blades

Abstract

The invention discloses a method and device for detecting freezing of wind generating set blades. The method comprises the steps that A, environment temperature and humidity, the wind speed, the wind direction, the position of an engine room, the pitch angle of the blades and generator power are acquired; B, data generated in a non-freezing state and in the process that the yaw error of a draught fan is too large is removed; C, the power and pitch angle calculated values under the actually-measured wind speed is obtained according to a wind speed power matrix and a wind speed pitch angle matrix; D, the difference value of the generator power and pitch angle actually-measured values and the calculated value are compared with a deviation set value, the set value is corrected, and a deviation optimized value is obtained; E, the deviation between the power and pitch angle monitored in real time and the power and pitch angle calculated according to the wind speed power matrix and the wind speed pitch angle matrix is compared, and when the deviation meets the deviation optimized value, it is judged that the blades are in a frozen state. According to the method and device, the freezing state of the wind generating set blades can be detected accurately and reliably, effective early warning and maintenance can be achieved, and therefore the generating capacity and stability of a set are improved, and the service life of the set is prolonged.

Description

technical field [0001] The invention relates to the technical field of wind power, in particular to a method and device for detecting icing of blades of a wind power generating set. Background technique [0002] After the blades are icy, the load of the wind turbine will increase, which will affect the life of the blades. Moreover, the ice load on each blade is different, which will increase the unbalanced load of the unit. Continued operation in the state of blade icing will cause damage to the unit. Very serious harm. When the freezing is serious, the unit has to be shut down off the grid, which greatly reduces the utilization rate of the unit in the low temperature area for many years. After the blade is frozen, the ice thickness of each section of the blade is different, so that the The change of the airfoil will affect the load of the wind turbine, and the life of the wind turbine will be affected to a certain extent. At the same time, the airfoil after icing will enter...

AI Technical Summary

Problems solved by technology

In addition, most of the existing detection systems only focus on the wind speed relative to the power fluctuation, and it is difficult to accurately distinguish whether the power fluctuation is caused by the small wind and the yaw is too large or the power fluctuation is caused by the icing of the blades

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