输出函数在单输入单输出非线性控制系统设计中的重要作用

深入研究了输出函数在非线性控制设计中的作用，指出输出函数在非线性控制设计中的一个重要功能是对闭环系统进行极点配置。并提出了一个对非线性控制系统具有一定普适性的输出函数形式。讨论了如何选择和确定该输出函数以及如何通过该输出函数来实现对系统闭环极点进行配置的方法。文中主要针对单输入单输出系统进行讨论，并以发电机励磁控制系统为例，给出应用实例。仿真结果表明按文中提出的观点选择输出函数，所设计的控制律能很好地协调发电机励磁控制系统各状态量的动、静态性能，不仅提高了发电机的动态稳定性，而且能准确地将发电机的端电压Uf控制在其给定值上运行，不会因受扰而发生静态偏移。

IMPORTANT EFFECTION OF THE OUTPUT FUNCTION IN SISO NONLINEAR CONTROL SYSTEM DESIGN

The influences of the output function on the system performances in nonlinear control design are discussed. A new viewpoint presented is that the poles of the closed-loop system can be re-assigned via selecting an appropriate output function. And a general form of output function for nonlinear control systems is also presented. How to select and calculate the output function of a nonlinear control system and how to place the poles of the system by using the selected output function are analyzed. The SISO system is discussed and analyzed. As an applying example in the SISO system, the method is used to design a nonlinear excitation controller of the generator. Simulation results show that both the dynamic and the steady-state performances of the synchronous generator with the proposed controller are greatly improved. Regulation of the generator terminal voltage and the stability of the generator unit with the developed control are enhanced.