Wind turbine load prediction control method based on sliding mode observer

Abstract

The invention discloses a wind turbine load prediction control method based on a sliding mode observer. The method comprises: firstly, establishing a wind speed model based on the wind shear effect, the tower shadow effect and the wind turbulence influence, and meanwhile establishing a wind turbine multivariable independent variable pitch system model; secondly, aiming at the problem of model prediction control performance reduction caused by model mismatching, increasing the variation of an instruction tracking error and a system state into a state vector, designing an augmented prediction model, and eliminating a steady-state tracking error; estimating the system state by using an adaptive nonsingular terminal sliding mode observer to improve the control precision and reliability of a controller; and finally, optimizing parameters of the controller by adopting an improved multi-target variable-speed grey wolf optimization algorithm. Simulation experiments show that the wind turbine load prediction control method provided by the invention can effectively eliminate steady-state errors, shorten the adjustment time and improve the control performance.

Description

technical field [0001] The invention relates to the technical field of robust control of wind power motors, and mainly relates to a wind power machine load augmentation predictive control method based on an adaptive non-singular terminal sliding mode observer. Background technique [0002] With the enlargement of wind turbines, the diameter of wind turbine blades and the swept area of ​​wind rotors are increasing, and the influence of wind shear effect and tower shadow effect is more significant (reference [1]). The resulting unbalanced load on the hub is very detrimental to the safe and stable operation of the wind turbine, and will further cause output voltage and power fluctuations. [0003] In the prior art, independent pitch control technology is generally used to reduce unbalanced loads, as shown in literature [2]. The independent pitch control technology is to coordinate the control of each pitch angle, the disadvantage is that the cost is high and the implementation...

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Problems solved by technology

[0023] Purpose of the invention: In view of the deficiencies in the above-mentioned background technology, the present invention provides a wind turbine load prediction control method based on a sliding mode observer, which considers state estimation and integrates the constraints of the actuator into the controller design, and at the same time solves the problem for MOGWO In the case of complex problems, the global search ability is weak and MOPSO is easy to fall into local optimum. The speed and position components of MOPSO are introduced into MOGWO, and an improved multi-objective variable speed gray wolf optimization algorithm is proposed to further optimize the parameters of the controller.

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