摘要
大型风电机组通常具有较大的转动惯量,风速变化时机组转速变化较为滞后,使得以转速反馈的变桨控制不够及时,导致高风速段的功率输出波动较大。为了减小风电机组在高风速下输出功率波动,快速稳定转速,在对桨距角变化下的转速特性与气动转矩特性建模和研究的基础上,提出了基于转矩反馈的自抗扰变桨控制策略。设计了线性自抗扰变桨控制器,实时估算机组的气动转矩,利用基于转矩反馈的扩张状态观测器对系统的内外扰动进行观测,并对扰动进行补偿。对基于转矩反馈的线性自抗扰变桨控制进行仿真,结果表明,与基于转速反馈的自抗扰变桨控制相比,基于转矩反馈的自抗扰变桨控制在风速变化时的功率与发电机转速波动更小,调节时间更短,采用线性自抗扰控制器对风力发电机参数依赖较小,在保证控制效果的同时降低了参数整定的难度,有较高的工程实用价值。
Large-scale wind turbines usually have greater moment of inertia,so that the changes in rotor speed caused by wind speed variation lag behind,which makes the regulation of pitch angle feedback by the rotor speed not timely enough.As a result,the power output in the high wind speed zone fluctuates greatly.In order to improve the power output quality and quickly stabilize the rotor speed of wind turbines in high wind speed zone,the pitch control strategy based on aerodynamic torque feedback was proposed.Both characteristics of rotor speed and torque under the pitch angle changes were modeled and studied.The pitch controller was designed through the linear active disturbance rejection control(ADRC)theory.The aerodynamic torque was estimated in real-time・The sum of internal and external disturbance of the control system was observed by the extended state observer(ESO)based on the feedback of aerodynamic torque and was compensated.The simulation results show that,the power output fluctuation is much smaller and the adjustment time is much shorter by use of torque feedback than by use of rotor speed feedback.The LADRC is less dependent on the parameters of wind turbine,and the difficulty of parameter tuning is reduced while the control effect is guaranteed.The control strategy by use of the LADRC and torque feedback is of high value in engineering application.
作者
崔天依
褚孝国
CUI Tianyi;CHU Xiaoguo(Xi'an Thermal Power Research Institute Co.,Ltd.,Xi'an 710054,China)
出处
《热力发电》
CAS
北大核心
2020年第1期55-62,共8页
Thermal Power Generation
关键词
风电机组
转动惯量
气动转矩
输出功率
桨距角
自抗扰控制
wind turbine unit
moment of inertia
aerodynamic torque
power output
pitch angle
active disturbance rejection control
