Torque and variable-pitch decoupling control method for wind driven generator set, controller and system thereof

Abstract

The invention provides a torque and variable-pitch decoupling control method for a wind driven generator set, a controller and a system thereof. The method comprises the following steps: calculating a variable-pitch control bias value in an area where a torque controller plays a leading role, adjusting a generator rotation speed reference set value of a variable-pitch controller, and outputting a corresponding pitch angle set value; calculating a torque control bias value in the area where the variable-pitch controller plays a leading role, adjusting the generator rotation speed reference set value of the torque controller, and outputting a corresponding electromagnetic torque set value. The controller comprises a variable-pitch bias area calculating module, the variable-pitch controller, a torque bias area calculating module and the torque controller. The system comprises a decoupling controller, a variable-pitch system, a current transformer, a pitch angle position sensor and a rotation speed sensor. According to the invention, decoupling for the torque controller and the variable-pitch controller of the wind driven generator set are achieved so as to improve performance of two controllers in respective action area, and avoid disturbing control effects with each other, thereby making good use of the advantages of variable-speed and variable-pitch wind driven generator sets.

Description

Technical field [0001] The invention relates to the technical field of wind power generation, in particular to a method, a controller and a system for decoupling control of torque and pitch of a wind power generator set. Background technique [0002] In recent years, with the continuous advancement of wind power related control technology, variable-speed pitch technology has become very mature. Variable-speed variable-pitch wind turbines have become the main installed type at present due to their high efficiency of wind energy utilization and large single-unit capacity. . [0003] When the variable-speed variable-pitch wind turbine is at low wind speed (below the rated wind speed), the main control system adjusts the pitch angle of the blades to the optimal (or minimum), and adjusts the impeller speed by controlling the electromagnetic torque of the generator to make the wind turbine work optimally In the tip speed ratio state, in order to achieve the maximum wind energy capture, ...

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Problems solved by technology

In addition, near the rated wind speed, the wind turbine constantly switches between the torque controller and the pitch controller frequently, and the switching moment is when the torque reaches the rated value, the damping of the speed fluctuation is small, and the pitch angle is still near the optimum , the ability to capture wind energy is strong, and the fluctuation of wind speed will cause large fluctuations in speed and power, which will affect the stability of grid load

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