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

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 simulat