论文部分内容阅读
针对高压直流输电系统,设计了一种鲁棒自适应输出反馈控制器。首先,将高压直流输电系统换流站动态模型转换成用输入-输出表示的非线性系统。然后,利用自适应非线性阻尼项来抑制系统的非线性动态不确定性和未知有界扰动,应用Lyapunov稳定性理论构造出控制器和自适应参数的表达式。Iyapunov稳定性分析结果表明,文中所提出的控制器保证了闭环系统的稳定性。最后,将设计的控制器应用到一个3机直流输电系统中,仿真结果表明,与传统的PI控制器相比较,文中控制器可大大提高系统的稳定性和鲁棒性。
Aiming at HVDC system, a robust adaptive output feedback controller is designed. First, the dynamic model of HVDC converter station is transformed into the nonlinear system represented by input-output. Then, the adaptive nonlinear damping is used to suppress the nonlinear dynamic uncertainties and the unknown bounded disturbances. Lyapunov stability theory is used to construct the expressions of controller and adaptive parameters. Iyapunov stability analysis results show that the proposed controller guarantees the stability of the closed-loop system. Finally, the design of the controller is applied to a three-machine DC transmission system. The simulation results show that compared with the traditional PI controller, the controller in the paper can greatly improve the system stability and robustness.