高压直流输电系统换流站鲁棒自适应输出反馈控制

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.Lyapunov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.

ROBUST SELF-ADAPTIVE OUTPUT-FEEDBACK CONTROL FOR HVDC CONVERTERS

Robust self-adaptive output-feedback controllers have been designed for the converters of HVDC system. First, the dynamic model of the converters of HVDC system is transferred to a nonlinear system with an input-output model. Then, a self-adaptive nonlinear damping item is used to counteract the nonlinear uncertainties and unknown bounded disturbances. Lyapunov stability theory is to form the controller and the self-adaptive law of the controller parameter. It is shown that the controllers can guarantee the stability of the closed-loop system. Finally, the proposed controllers are applied to a HVDC transmission system with 3 generators. Simulation results show that the controllers proposed in this paper can greatly enhance the stability and robustness of the system, compared with the traditional PI controllers. This work is jointly supported by National Key Basic Research Special Fund of China ( No. G1998020311) and National Natural Science Foundation of China ( No. 60374012).