Variable-speed variable-pitch wind generating set maximum power tracking control method based on internal model control

Abstract

The invention discloses a variable-speed variable-pitch wind generating set maximum power tracking control method based on internal model control. The variable-speed variable-pitch wind generating set maximum power tracking control method based on internal model control comprises the steps of (1) carrying out modeling on a wind generating set resisting moment response system to obtain a reference model, (2) designing an internal model controller on the basis of the reference model, and providing an analysis expression of the internal model controller, and (3) achieving optimal resisting moment control at the connection position between a hub and a main shaft low-speed shaft on the basis of the internal model control mode when the wind speed is smaller than the rated wind speed. Compared with a traditional maximum power tracking algorithm, the variable-speed variable-pitch wind generating set maximum power tracking control method based on internal model control effectively reduces influence caused by factors, such as aerodynamic moment fluctuation, measurement errors and modeling errors, on optimal resisting moment tracking, and efficiently achieves maximum power tracking on wind energy absorption of a wind wheel. Aiming for a common unit negative feedback single loop control system, the invention discloses an equivalent single loop unit negative feedback control system based on internal model control, and provides the analysis expression of the internal model controller.

Description

technical field [0001] The invention belongs to the technical field of wind power generation, and relates to a maximum power tracking control method for a variable-speed variable-pitch wind power generating set below a rated wind speed. Background technique [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...

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Problems solved by technology

[0007] For the traditional maximum power tracking control, the transmission system is relatively ideally considered in the control strategy, and the influence of each link of the transmission system and the transmission characteristics is not considered. At the same time, due to the fluctuation and randomness of the wind speed, the aerodynamic torque generated by the wind rotor after receiving the wind Fluctuation has strong uncertainty, so there is a certain deviation from the optimal control torque trajectory in the actual control process, and the optimal maximum power tracking control cannot be efficiently realized

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