输出函数在多输入多输出非线性控制系统设计中的重要作用  

Important Affection of the Output Function in MIMO Nonlinear Control System Design

作　　者：李啸骢[1] 程时杰[2] 韦化[1] 龙军[1] 

机构地区：[1]广西大学电气工程学院,广西壮族自治区南宁市530004 [2]华中科技大学电力系,湖北省武汉市430074

出　　处：《中国电机工程学报》2006年第9期87-93,共7页Proceedings of the CSEE

基　　金：国家重点基础研究专项经费项目(G1998020319);广西教育厅科研基金项目(T98101)~~

摘　　要：针对多输入多输出系统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。讨论了通过将输出函数选取为多状态量的线性组合形式来实现对系统闭环极点进行配置的方法。在多输入多输出系统中,针对凝汽式汽轮发电机给出应用实例。举例中讨论了通过将输出函数选取为发电机端电压Uf、转子角速度ω、转子角加速度ω、输出有功Pe等状态量的线性组合来设计出具有多性能指标的非线性控制律,以改善系统的动、静态性能。仿真结果表明所提出的控制律不仅能明显地提高发电机的动态稳定性,而且能准确地将发电机的端电压Uf和输出有功Pe控制在其给定值上运行,不会因受扰而发生偏移。这表明所提出的控制律能很好地协调系统的动、静态性能。In this paper, for MIMO control system, the influences of the output function on the system performances in nonlinear control design are discussed. A new viewpoint presented in this paper 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, that is the output function should be selected as the combination of the full state variables or multiple state variables As an applying example in the MIMO system, the method is used to design a nonlinear integrated controller of the condensing turbine generator unit. To improve and coordinate the dynamic and static performances of the system, a multi-index control law is derived by selected the output function combined with the state variables of generator voltage Uf, rotor angular speed ω, rotor angular acceleration ω and active power output Pe＂ Simulation results of using the proposed control law in a single-machine infinite-bus power system show that both the dynamic performances and the steady-state performances of the synchronous generator unit are greatly improved. Not only the stability of the generator unit when subjected to the disturbances is greatly enhanced, but also the terminal voltage and active power output of the generator can still be kept at their setting values after a step disturbance.

关 键 词：电力系统 多指标非线性控制 输出函数 极点配置 凝汽式汽轮发电机综合控制 动态性能 静态精度 

分 类 号：TM761[电气工程—电力系统及自动化]