考虑通信延迟的网络化AGC鲁棒控制器设计

Networked AGC Robust Controller Design in Consideration of Communication Delay

传感器,执行器以及控制器之间的延迟不确定性问题是网络化控制系统(NCS)的一个关键问题。文中对网络化环境下的AGC系统的延迟进行了分析,提出了基于时滞系统控制理论的AGCH∞控制方法。该控制器采用时滞依赖性稳定条件进行设计,该方法可以克服时滞独立性稳定条件的保守性,且被控系统的状态方程系数不必满足任何约束条件。为验证所提出方法的有效性,利用SIMULINK对两区域AGC系统进行了仿真,表明该方法可以有效抑制延迟对系统稳定性的影响。

Time delay uncertainty among the sensors, actuators and controllers is a key problem for the networked control system （NCS）. After analyzing the time delay characteristic of a networked AGC system, a robust AGC controller is presented in this paper to meet the networked time-delayed environment by using the time-delayed system control theory. The time-dependent stability criteria is adopted to design the robust H∞ controller. It can overcome the conserativeness which is brought by the time-independent stability criteria,moreover,the coefficient in the state equations need not meet any constraint.A two-area AGC system is studied through digital simulations, to demonstrate the comprehensive applications of the proposed strategy, and the result shows the effectiveness of the presented strategy.