无源高阶终端滑模控制双馈风力发电系统

Passivity and higher-order sliding mode control for doubly-fed induction generator wind power system

为了简化双馈风力发电系统模型并且使得系统具有抗干扰的特性,依据无源性理论和滑模控制理论从能量和鲁棒性的角度研究了变速恒频双馈风力发电系统。首先建立了基于Euler-La-grange(EL)方程的双馈风电系统数学模型,使得双馈风电系统分解为电气和机械两个无源子系统的反馈互联。在设计控制器时只需考虑电气子系统,而机械子系统是一个能量耗散系统,通过选择适合的参数可以保证稳定,因此简化了控制算法。针对速度环响应速度慢,鲁棒性差的问题设计了高阶非奇异滑模速度控制器。仿真结果表明了所提控制算法简单有效,能够保证风力发电系统输出恒定频率的同时,电机转速也能快速的跟踪参考转速,提高了整个系统的动静态性能。

In order to simplify the model of doubly-fed induction generator（DFIG） and improve the robustness,variable speed and constant frequency（VSCF） DFIG wind power generation systems from the perspective of energy and robustness based on passivity and sliding mode control（SMC） theory were studied.Firstly,the model of DFIG based on Euler-Lagrange（EL） equations was established,so the original DFIG wind turbine system is divided into electrical and mechanical subsystem.For two subsystems,the electrical subsystem was designed;while the mechanical subsystem is a energy-consuming system and stable through selecting the suitable design parameters,so the system control algorithm is simplified.A high-order terminal SMC to get a faster speed and the better robustness for the speed loop was designed.Simulation results show that the proposed controller is simple and effective,and it not merely can guarantee the wind power system output constant frequency and the motor speed can also track the reference speed quickly,so the static and dynamic performance of the whole wind turbine system is improved.