Dynamic torque control method capable of tracking optimal modal gain based on air density

Abstract

The invention relates to a dynamic torque control method capable of tracking optimal modal gain based on air density. The method specifically comprises the following steps that S1, a main control system obtains a real-time wind speed, whether the real-time wind speed is greater than a preset rated wind speed or not is judged, the step S4 is executed if the real-time wind speed is greater than thepreset rated wind speed, and otherwise, the step S2 is executed; S2, a torque control module obtains an air density value and an angular speed of blade rotation, calculates to obtain an optimal torquecontrol coefficient, and sends the optimal torque control coefficient to the main control system; S3, the main control system adjusts the blade tip speed ratio of a wind wheel according to the optimal blade tip speed ratio corresponding to the optimal torque control coefficient, and maximum capture of wind energy is achieved; and S4, a pitch angle control module constructs a pitch angle algorithmmodel according to simulation software, adjusts corresponding parameters to calculate to obtain an optimal pitch angle parameter and sends the optimal pitch angle parameter to a variable pitch system, the variable pitch system adjusts a pitch angle, and a constant rotating speed is maintained to realize maximum capture of wind energy. Compared with the prior art, the method has the advantages ofachieving maximum capture of wind energy, effectively improving the wind energy utilization efficiency of a wind turbine generator and the like.

Description

technical field [0001] The invention relates to the technical field of wind power generation, in particular to a dynamic torque control method based on air density tracking optimal modal gain. Background technique [0002] Improving the energy efficiency conversion rate of variable speed and pitch wind turbines is an important goal pursued by wind turbine designers. Due to the unreliability of wind speed measurement, it is difficult to establish a direct correspondence between the speed and wind speed. Therefore, when the wind speed is below the rated wind speed, the angular speed is used instead of the wind speed to establish the relationship between the speed and torque to achieve optimal torque control; Adaptive control, by simulating the blades of the unit, the optimal pitch angle in each wind speed segment is obtained. [0003] The existing technology usually uses the speed-torque look-up table method to achieve the best tip speed ratio tracking, and it is determined t...

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Problems solved by technology

[0006] The purpose of the present invention is to provide a method based on air density tracking in order to overcome the defects in the above-mentioned prior art that the measurement of the tip speed ratio and the optimal pitch angle is inaccurate, which leads to the decrease of the operating output efficiency of the fan and the decrease of the power generation of the wind turbine. Dynamic Torque Control Method with Optimal Modal Gain

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