Wind turbine generator unit maximum wind energy capture control method based on dynamic torque limiting value

Abstract

A wind turbine generator unit maximum wind energy capture control method based on the dynamic torque limiting value includes the following steps that firstly, the Cp-lambda curve family of a unit is determined according to the aerodynamic characteristics of paddles, and when beta=betafine=constant and lambda=lambdaopt=constant, the maximum value of Cp=Cpmax is obtained; secondly, the optimal modal gain coefficient is calculated according to the numerical values of Cpmax and lambdaopt; thirdly, the torque of the quadric curve of the optimal wind energy capture is obtained; fourthly, the proportionality coefficient Kp and the integral coefficient Ki of a torque PI controller are determined according to the performance index requirement of the torque controller; and fifthly, the reference rotation speed [omega]ref, the maximum torque Tmax and the minimum limiting value Tmin of the controller are dynamically calculated according to the current generator rotation speed value, and therefore the torque controller can work along the ideal running trace curve, and the maximum wind energy capture is achieved. The wind turbine generator unit maximum wind energy capture control method based on the dynamic torque limiting value can effectively achieve the maximum wind energy capture and is large in energy efficiency conversion rate and high in electric energy quality.

Description

technical field [0001] The invention relates to the field of wind power generation, in particular to a method for controlling maximum wind energy capture of wind turbines based on a dynamic torque limit torque PI (proportional integral) controller. Background technique [0002] Variable-speed constant-frequency wind turbines are currently the mainstream type of large-scale grid-connected wind turbines. Compared with constant-speed wind turbines, the main advantage of variable-speed wind turbines is that they can adjust the speed in a wide range to keep the wind energy utilization coefficient at the maximum. When the wind speed is higher than the cut-in wind speed and lower than the rated wind speed, and the output power of the generator set is lower than the rated power, the generator set operates in the variable speed control mode, and the control system controls the torque of the generator to adjust the generator speed to maintain the best blade tip speed ratio and realize ...

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Problems solved by technology

[0005] In order to overcome the deficiencies of the existing control methods for wind energy capture of wind turbines that cannot achieve maximum wind energy capture, low energy efficiency conversion rate, and poor power quality, the present invention provides a method that can effectively achieve maximum wind energy capture, high energy efficiency conversion rate, and high power quality. Higher maximum wind energy capture control method for wind turbines based on dynamic torque limit

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