针对永磁同步风力发电机在传统控制方法下存在的控制精度低、抗干扰性能差以及在风能捕获过程由风速快速变化引起较大的控制输入量从而产生饱和约束等问题,基于输入输出反馈线性化（IOFL）方法,结合有限时间（FT）理论与滑模控制（SMC）为输入饱和的PMSG设计一种有限时间滑模控制器（FT-SMC）。首先,引入IOFL来提高系统控制精度,在其基础上设计FT-SMC来增强系统的鲁棒性能;然后,在FT-SMC中引入抗饱和补偿器（ATC）解决系统中输入饱和引起的控制稳定性问题;然后,利用Lyapunov稳定性理论分析闭环系统的稳定性,保证系统在有限时间内能够快速跟踪且稳定运行。最后,在Matlab/Simulink仿真实验和半实物仿真平台上进一步验证所设计控制器的有效性和对系统转速的跟踪性能,实验结果表明FT-SMC具有控制精度高、响应速度快、抗干扰能力强等优点。
Abstract
Aiming at the problems of low control accuracy and poor anti-interference performance of permanent magnet synchronous wind generator（PMSG） under the traditional control method and the saturation constraint caused by the rapid change of wind speed in the process of wind energy capture, this paper proposed a finite-time and sliding mode controller（FT-SMC） for input-saturated PMSG based on the input-output feedback linearization（IOFL） method, combined with finite-time（FT） theory and sliding mode control （SMC） a finite-time and sliding mode controller （FT-SMC） is designed for input-saturated PMSG based on the input-output feedback linearization（IOFL） method, combined with finite-time（FT） theory and sliding mode control（SMC）. Firstly, IOFL is introduced to improve the control accuracy of the system, and FT-SMC is designed on the basis of IOFL to enhance the robustness of the system. Then, an anti-saturation compensator （ATC） is introduced into the sliding mode control system to solve the control stability problem caused by input saturation. Besides, the Lyapunov stability theory is used to analyze the stability of the closed-loop system to ensure that the system can achieve fast tracking and stable operation in a finite time. Finally, the effectiveness of the designed controller and the tracking performance of the system speed are further verified on the Matlab/Simulink simulation and semi-physical simulation platform. The experimental results show that FT-SMC has the advantages of high control accuracy, fast response speed and strong anti-disturbance ability.
关键词
风力发电机 /
滑模变结构控制 /
反馈线性化 /
抗饱和补偿器 /
有限时间
Key words
wind turbine generators /
sliding mode control /
feedback linearization /
anti-saturation compensator /
finite time
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