Individual pitch-changing control optimization method for large-scale wind generating set

Abstract

The invention discloses an individual pitch-changing control optimization method for a large-scale wind generating set. The method comprises the following steps that 1), whether the wind generating set shuts down or not is judged; 2), if wind is relatively small and an individual pitch-changing control function of the large-scale wind turbine generator is not started, a collaborative pitch-changing control method is adopted, and three blades are feathered to 90 degrees at a fixed speed; 3), if the wind is relatively large and the wind turbine generator is in the individual pitch-changing control mode, when a shutdown command is received, a collaborative pitch-changing control ring outputs a desired pitch angle beta c; 4), a deviation control ring judges the control mode according to the rotating speed of an electric generator of the wind turbine generator; 5), if the rotating speed of the electric generator is greater than the rotating speed of grid connection, the deviation pitch-changing control ring keeps normal output; 6), otherwise, the deviation pitch-changing control ring gradually exits, and an amplitude limiting ring is used for implementation; 7), collaborative pitch-changing control and deviation pitch-changing control are simultaneously started; and 8), if the pitches of the three blades are changed to 90 degrees, shutdown is finished. According to the method, unbalanced loading of the wind generating set can be reduced in the whole shutdown process.

Description

technical field [0001] The invention relates to the technical field of wind power generation, in particular to a control method for independent pitch change of a wind power generating set. Background technique [0002] During the operation of the wind turbine, due to the existence of wind shear, turbulence, tower shadow effect, yaw deviation and other factors, the wind speed distribution in the sweeping surface of the wind rotor will be uneven, so that the impeller bears a large unbalanced load , and the larger the diameter of the wind rotor, the stronger the unbalanced force on the sweeping surface of the entire wind rotor, and the more obvious the unbalanced load on the impeller. The unbalanced load on the impeller will cause a large fatigue load on the key components of the wind turbine such as pitch bearings, hubs, main shafts, yaw bearings, and towers. In order to reduce the unbalanced load of the impeller, the patent document (ZL200910100064.8) proposes an independent...

AI Technical Summary

Problems solved by technology

This shutdown control method, compared to figure 2 The shutdown control method adopted can better suppress the unbalanced load peak value at the time of the shutdown failure, but the cooperative pitch shutdown control mode is used most of the time during the shutdown process, which will still cause a large unbalanced load to the unit, affecting Unit life

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