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Self-adaptive dynamic surface control method for variable pitch system of wind driven generator

A wind turbine and dynamic surface control technology, which is applied in the control of wind turbines, engine control, wind turbines, etc., can solve the problems of nonlinear, time-varying, difficult to establish an accurate mathematical model, and difficult to control, so as to improve the self-adaptive ability. , the effect of improving accuracy, improving dynamic performance and anti-interference ability

Active Publication Date: 2021-03-19
CHONGQING UNIV OF POSTS & TELECOMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Under complex working conditions, nonlinear, time-varying, and uncertain wind turbines make it difficult to establish an accurate mathematical model, so when designing a controller, there will be problems that are difficult to control, etc.

Method used

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  • Self-adaptive dynamic surface control method for variable pitch system of wind driven generator
  • Self-adaptive dynamic surface control method for variable pitch system of wind driven generator
  • Self-adaptive dynamic surface control method for variable pitch system of wind driven generator

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Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0015] (1) Upgrading based on the fan system model

[0016] According to the principle of aerodynamics, combined with literature [5], the mechanical power P of the wind turbine can be obtained r for:

[0017] P r =0.5ρπR 2 C p (λ,β)V 3 (1)

[0018]

[0019]

[0020] In the formula, P r is the mechanical power of the wind turbine, ρ is the air density, R is the radius of the wind rotor, C p (λ, β) is the wind energy utilization coefficient, λ is the tip speed ratio, V is the wind speed, ω r is the angular velocity of the wind rotor. T r The mechanical torque generated by the wind turbine rotor. β represents the pitch angle of the wind turbine.

[0021] Wind energy utilization coefficient C p (λ,β), approximately expressed as:

[0022]

[0023] The low-speed shaft drive system model on the wind rotor side is:

[0024]

[0025] where J r Indicates the moment of inertia of the wind rotor, T d =b 1 +b 1 / ω r +b 3 ω r ,T d is the resistance torque,...

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Abstract

The invention discloses a self-adaptive dynamic surface control method for a variable pitch system of a wind driven generator, and relates to the field of variable pitch control of wind turbines. Firstly, due to the fact that a wind turbine system has factors such as time varying and nonlinearity, an accurate high-order system model is difficult to establish, linear order increasing is conducted on an original wind turbine system model, and a high-order feedback variable is obtained; then, an extended observer is adopted to observe system parameters after order increasing, so that the change of the high-order system parameters can be observed more accurately; meanwhile, due to the influence of external factors, part of uncertain parameters, unknown interference and the like exist in a high-order system, an adaptive algorithm is proposed to be adopted for approximation, and therefore real-time compensation of the system model is achieved; and finally, a system control law is derived through a dynamic surface algorithm, so that the whole system meets the requirements.

Description

technical field [0001] The invention relates to a large-scale wind turbine pitch control method with a high-gain expansion observer and an adaptive dynamic surface, and belongs to the field of constant output power control of wind turbines. Background technique [0002] Wind energy is a clean and renewable energy, which can effectively reduce the dependence on fossil energy. At the same time, it also plays a great role in protecting the environment. From the perspective of energy, the development prospect of wind energy is very clear. In the wind turbine system structure, the pitch module is an important device for wind turbine energy conversion. When the external wind speed is lower than the rated wind speed of the wind turbine, the blade pitch angle of the wind turbine is usually a constant value. When the wind speed exceeds the rated wind speed of the wind turbine, if the pitch angle is not changed, the output power of the entire wind turbine will also increase according...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F03D7/00
CPCF03D7/00F05B2270/328F05B2270/70Y02E10/72
Inventor 任海军王帅周高李琦韦冲沈力
Owner CHONGQING UNIV OF POSTS & TELECOMM
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