A mppt control method for wind power system based on the universal gravitational neural network

Abstract

Provided is a universal gravitation neural network based wind power system MPPT control method. According to the method, on the basis that a large amount of power-rotation speed-wind speed samples are established, a universal gravitation neural network prediction model of wind speed is established and is utilized to perform wind speed estimation, then an optimum tip speed ratio method is adopted to predict an optimal fan rotation speed corresponding to a maximum power point, the fan rotation speed is adjusted to be the predicted optimal fan rotation speed, the rotation speed is used as an initial value, and a duty ratio perturbation and observation method is adopted to set perturbation step length for tracing the maximum power of a fan. The estimation method is adopted to obtain the wind speed without a wind speed sensor, the control cost of the system can be effectively saved, and the reliability of the system can be improved. The method utilizes a universal gravitation search algorithm to optimize a neural network model, and wind speed estimation accuracy can be effectively improved. In addition, the universal gravitation neural network based wind power system MPPT control method further has the advantages of being high in tracing speed and capable of improving the powder generating efficiency of the fan.

Description

Technical field [0001] The invention relates to a maximum power tracking control method of a wind power generation system based on a gravitational neural network, and belongs to the technical field of wind power generation. Background technique [0002] With the continuous development of the social economy and the ever-increasing energy crisis, wind energy as a renewable energy source has received more and more attention from the world today. [0003] The maximum power tracking of a wind turbine means that the maximum power output is obtained by adjusting the wind turbine speed below the rated wind speed to keep the wind energy utilization coefficient at the maximum value. Based on the basic control principle of maximum power tracking, wind turbine control methods can be roughly divided into three categories: tip speed ratio method, power feedback method and hill climbing search method. [0004] Tip speed ratio method: Under a certain fixed wind speed, the maximum power tracking can...

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Problems solved by technology

In addition, this method requires the speed to have a good instantaneous response to wind speed changes. When the fan capacity is large, due to the inertia of the system, the speed disturbance cannot get a timely power response, resulting in the actual control effect of the hill-climbing search method.

[0007] In summary, the existing control methods for wind power generation systems have disadvantages such as high cost and poor tracking accuracy, which limit the development of wind power generation, so it is necessary to improve them

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