Decoupling control method for variable pitch control and torque control of large wind turbine unit

Abstract

The invention discloses a decoupling control method for variable pitch control and torque control of a large wind turbine unit. The large wind turbine unit consists of a variable pitch control system and a torque control system. During the operation of a fan, a pitch PID (Proportion Integration Differentiation) controller and a torque controller operate simultaneously, wherein variable pitch control is implemented by the pitch PID controller, and torque control is implemented by the torque controller. The variable pitch control system is formed by a pitch deviation calculating module, a pitch PID controller module, a pitch amplitude limiting module and the like by means of combination, and the torque control system is formed by a torque deviation calculating module, a torque PID controller module, a torque amplitude limiting module and the like by means of combination. The decoupling control algorithm provided by the invention realizes decoupling algorithms of the pitch controller and the torque controller by amending controller software without adding extra hardware, so that the cost of the fan is reduced.

Description

technical field [0001] The present invention relates to a control method for a large-scale wind turbine, in particular to a decoupling control method for pitch control and torque control of a large-scale wind turbine Background technique [0002] With the large-scale application of wind power, power generation companies and grid operators have put forward more stringent requirements on the control system of wind turbines in terms of power curve, grid friendliness, unit life, and optimal design. The existing wind turbine control system mainly adopts the control method combining torque control and pitch control. When the power of the wind turbine is less than the rated power, the torque control method is mainly used, and the torque controller is used to give the torque command to indirectly adjust the speed of the fan to follow the change of wind speed to achieve the optimal tip speed ratio and capture the maximum wind energy. When the wind speed exceeds the rated wind speed ...

AI Technical Summary

Problems solved by technology

[0011] The technical problem to be solved by the present invention is: the current decoupling technical scheme of pitch control and torque control will cause a relatively large impact load in the process of switching between pitch control and torque control, and at the same time the two kinds of control The switching between them is too frequent, resulting in excessive fatigue load of key components, which affects the service life of components

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