为了提高风能转换系统在故障穿越期间直流母线电压的暂态特性,解决线性自抗扰控制（LADRC）中固定的带宽带来的观测器响应速度和系统抗干扰性之间的矛盾,在线性自抗扰控制（LADRC）的基础上提出一种基于神经网络的最优带宽线性自抗扰控制（LADRC-OB）策略。首先分析带宽对系统性能的影响,然后根据系统已知模型设计LADRC控制器,并利用BP神经网络算法通过直流母线电压的参考值与实际值之间的偏差调整网络的输出。而神经网络的输出为LADRC的2个重要参数——观测器带宽ω0和控制器带宽ωc,这可解决LADRC的参数整定问题。最后,将LADRC-OB应用于1.5 MW的风能转换系统仿真模型中,并与采用双闭环PI时的控制效果进行对比,验证LADRC-OB具有更好的控制特性。此外,还对LADRC-OB的稳定性进行分析。
Abstract
In order to improve the transient characteristics of DC bus voltage in wind energy conversion system during fault ride through, solve the contradiction between the response speed of the observer and the anti-interference performance of the system caused by the fixed bandwidth in the linear active disturbance rejection control（LADRC）, the optimal bandwidth linear active disturbance rejection control based on neural network（LADRC-OB） is proposed based on LADRC. Firstly, the influence of bandwidth on the system performance is analyzed. Then the LADRC is designed according to the known model of the system, and the output of the network is adjusted by using BP neural network algorithm through the error between the reference value and the actual value of the DC bus voltage. The output of neural network is two important parameters of LADRC, observer bandwidth ω0 and controller bandwidth ωc. This also solves the problem of LADRC parameter setting. Finally, the LADRC-OB is applied to the simulation model of the 1.5 MW wind energy conversion system, and compared with the control effect of double closed-loop PI, it is verified that LADRC-OB has better control characteristics. In addition, the stability of LADRC-OB is analyzed.
关键词
风能 /
神经网络 /
变流器 /
线性自抗扰控制 /
最优带宽
Key words
wind power /
neural networks /
power converters /
liner active disturbance rejection control /
optimal bandwidth
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基金
国家自然科学基金面上项目（51877152）; 天津自然科学基金（18JCZDJC97300）
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