Maximum wind energy capture method for variable speed wind turbines based on effective wind speed estimation

Abstract

The invention discloses a variable-speed wind generating set maximum wind energy capturing method based on effective wind speed estimation. The method comprises an effective wind speed estimating model and a maximum wind energy capturing controller. In order to acquire an effective wind speed estimated value, a training set of an SVR model is formed by normalized unit historical output data and historical wind speed measured values, penalty parameters and kernel function parameters are selected by a GA algorithm to obtain the trained SVR model, and the model gives out the wind speed estimatedvalue in an online manner; and when the maximum wind energy capturing controller is design, the real-time optimal wind wheel rotating speed estimated value is obtained according to effective wind speed which is given out by the effective wind speed estimating model, nonlinear characteristics and parameter uncertainty of the system are responded by robust factors and a neural network, and therefore, boundedness of rotating speed tracking errors and stability of a wind generating set system are realized. By the method, a mathematical model and parameters of the unit do not require to be used, adesign process is simple, an implementing cost is low, and the capacity of the unit and the economic benefit of a wind power plant can be improved.

Description

technical field [0001] The invention relates to the technical field of control of variable-speed wind power generators, in particular to the maximum wind energy capture control of variable-speed wind power generators. Background technique [0002] With the development of human society, energy shortage and environmental crisis have become increasingly serious. As the most widely used new energy power generation method, wind power is an important means to solve energy and environmental crises. In recent years, wind power has developed very rapidly. According to a report issued by the World Wind Energy Association (IEA), by 2050, the global wind power penetration rate will reach 15-18%. Generally speaking, wind turbines can be divided into fixed-speed wind turbines and variable-speed wind turbines. Compared with fixed-speed wind turbines, variable-speed wind turbines have higher power generation efficiency and lower structural loads. Therefore, in the current wind power marke...

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Problems solved by technology

[0007] In order to improve the production capacity of the unit and solve the problem that the existing maximum wind energy capture controller based on effective wind speed estimation has a high cost of implementation, a large amount of calculation, and cannot cope with the nonlinear characteristics of the system and the uncertainty of the parameters, the problem of the production capacity decline of the unit is provided by the present invention. A simple and easy-to-operate maximum wind energy capture controller based on effective wind speed estimation that does not depend on system mathematical models and parameters can accurately establish the nonlinear relationship between unit output and effective wind speed, and can better deal with system nonlinearity and parameters Drift, adapt to different types of units, improve unit capacity and economic benefits of wind farms

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