Dynamic optimization method for optimal drag torque of variable speed and variable pitch wind turbines

Abstract

The invention discloses a dynamic optimization method for optimal resisting moment in the connection of a hub and a low-speed shaft in a variable-speed variable-pitch wind generating unit. The dynamic resisting moment optimization design method is deducted for the wind generating unit at the speed lower than the rated wind speed through equivalent deduction, and an analytical expression is provided. According to the method, rotation acceleration of a turbine is fed back to the moment input end, thus the capacity of responding to the rotation speed of the turbine is increased effectively. Compared with the existing common self-optimizing method, the method has the advantages that the influence on the maximum power tracking dynamic response performance, caused by great rotational inertia, is reduced evidently, while steady-state precision tracking performance of self-optimizing tracking control is unchanged; the capacity of tracking maximum power of the turbine is improved effectively.

Description

technical field [0001] The invention belongs to the technical field of wind power generation, and relates to a dynamic optimization method for the optimal resistance torque of a variable-speed variable-pitch wind power generating set. technical background [0002] Wind energy is currently the most economically valuable renewable energy source. According to the "China Wind Power Development Roadmap 2050" issued by the Energy Research Institute of the National Development and Reform Commission, China's wind power development goals for the next 40 years: by 2020, 2030 and 2050, wind power installed capacity The capacity will reach 200 million, 400 million and 1 billion kilowatts respectively, and by 2050, wind power will meet 17% of domestic electricity demand. [0003] At present, wind turbines have become the main equipment for wind energy utilization, and variable-speed variable-pitch wind turbines are the mainstream type of wind turbines. [0004] Variable-speed variable-p...

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Problems solved by technology

[0005] At present, the capacity of variable-speed and variable-pitch wind turbines is gradually expanding. Variable-speed and variable-pitch wind turbines above MW have become the mainstream products of power generation equipment. Large-capacity offshore wind turbines exceeding 3MW have also been gradually put into use. The length also increases accordingly. At present, the blade length of mainstream MW-level wind turbines has exceeded 35 meters, especially the blades of low-speed wind turbines designed for China's climate conditions often exceed 40 meters. The generator and transmission system lead to a further increase in the moment of inertia of the rotor rotor, and a further decrease in the speed adjustment capability of the wind rotor, which seriously affects the dynamic effect of the maximum power tracking of the wind rotor below the rated wind speed

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