AGC系统中的非线性观测器设计  

Nonlinear Observers Design in AGC Systems

作　　者：金涛涛[1] 李平康[1] 

机构地区：[1]北京交通大学机械电子与控制工程学院,北京100044

出　　处：《控制工程》2007年第B05期73-75,188,共4页Control Engineering of China

摘　　要：AGC(自动发电控制)系统是一个十分复杂的系统,其具有严重的非线性,且输入(锅炉、轮机等动力产生部分)和输出(频率负载)均存在未知扰动,为了实现对发电系统的精确控制,设计出输入输出扰动的观测器显得尤为重要。在阐述了一种带有未知输入输出扰动的非线性观测器设计方法的同时,是对传统的只能观测输入环节中的未知扰动观测器的一大改进。通过对系统状态方程和输出方程的一系列解偶变换,将输入、输出扰动从系统中分离出来。解偶后,系统分为受扰子系统和无扰动子系统两部分,通过对无扰动子系统的分析,最终设计出输入输出未知扰动观测器。系统观测器增益矩阵则通过求解一个代数Riccati方程(ARE)得到。将设计出的观测器用于故障检测与隔离(FDI)并取得良好的效果。Automatic generation control system is very complex, its complex lies in its nonlinear where both power generating inputs（such as in boiler and turbine unit）and frequency load output（ as for the power demand user）disturbances are exist, The nonlinear observer design method for nonlinear system with unknown disturbances both in input and output is developed, It is an extension of only unknown input disturbance approach, The approach is to decouple the disturbances from the rest of the system through a series of transformations on the both state and output equations. Once total disturbance decoupling is achieved; an appropriate observer for the disturbance flee part is proposed and designed, The observer gain matrix is determined by solving an algebraic Riccati equation. The designed observer is used for estimation of the unknown input and output disturbances, which then could be used as fault detection and isolation.

关 键 词：AGC 非线性系统 观测器 未知输入输出扰动 故障检测与隔离(FDI) 

分 类 号：TP27[自动化与计算机技术—检测技术与自动化装置]