Variable Pitch Control of Wind Power Generation System Based on Wiener Model

doi:10.16182/j.issn1004731x.joss.22-0284

Abstract

Abstract:

Strong nonlinearity and large fluctuation are the characteristics of wind power generation system. Quickly controlling the output power of wind turbines within the rated range under wind speed random changes is the major problem of wind power system control. Aiming at the pitch control of 5 MW wind turbines, a pitch control scheme for wind power generation systems based on the Wiener model is proposed. On the basis of the special structure in which the linear and nonlinear links of the Wiener model can be separated, the controlled object of a generalized wind power system with linear properties is constructed by calculating the inverse of the nonlinear part, which simplifies the nonlinear pitch control problem of the wind power system to a linear model control. The independent separable signal is used to identify the Wiener model of wind turbines by separate steps, which can accurately predict the output power of the wind turbines. The simulation examples show that the control method can effectively improve the control effect of the pitch system.

Key words: wind turbine, pitch control system, wiener model, separate step identification

CLC Number:

TP273

Yue Xu, Li Jia, Xuanyi Fu. Variable Pitch Control of Wind Power Generation System Based on Wiener Model[J]. Journal of System Simulation, 2022, 34(8): 1741-1749.

Figures/Tables 10

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Table 1

NREL offshore 5MW benchmark wind turbine model parameters

主要参数	量值
额定功率/MW	5
切入、额定、切出风速/(m/s)	3、 11.4、 25
切入、额定转子速度/(r/min)	6.9、 12.1
固有频率 $ω n$ /(rad/s)	0.88
桨距角机构阻尼系数 $ξ$	0.1
齿轮箱传动比 $N g$	97
风机转动惯量 $J r$ /(kg·m²)	38 768 000
发电机转动惯量 $J g$ /(kg·m²)	534.116
刚度系数 $K θ$ /(N·m/rad)	867 636 000
传动系统阻尼系数 $B θ$ /(N·m/(rad·s^-1))	6 215 000
发电机时间常数 $τ g$	0.1
空气密度 $ρ a$ /(kg·m³)	1.225
风轮半径 $R r$ /m	63
发电机效率 $η$ /%	94.4

Table 1

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