Design And Development Of A Control System Hardware-In-Loop Simulation Platform For High-Order Process

High-order system is the typical controlled object in actual industrial system,and at present,some scholars are studying the improved PID control algorithm for high-order system in order to obtain better control effect.The control algorithm simulation platform is an important tool of control algorithm validation,but some existing simulation platforms for control algorithm validation,because of the controlled object being low-order system,are not suitable for simulation research of improved PID control algorithms for high-order systems.Based on the existing low-order control system physical simulation platform,this paper developed the high-order control system hardware-in-the-loop simulation platform for the simulation verification of the improved PID control algorithm,which solves the simulation problem of improved PID control algorithm.The main work is divided into the following three aspects:1.This paper proposed a method of "virtual-real" to build the higher-order controlled object on the basis of low-order control system simulation platform.At present,the controlled object of existing low-order control system simulation platform in the laboratory is low-order physical controlled object,which is difficult to be transformed into a higher-order physical controlled object.In order to build high order controlled object,by using virtual-real method,high order controlled object is decomposed into physical system part and virtual system part,and the first is using low-order physical controlled object on existing platform and the latter is using real-time mathematical model setting up in the controller;In the actual simulation,two parts together constitute a high-order controlled object.In order to guarantee high-order system characteristics,designing a virtual system need consideration of the characteristics of the physical system.Step response experimental results show that the constructed high order meet the high-order system characteristics.In addition,in order to use the simulation platform easily,high-order controlled object is masked as a modular in Simulink.2.Based on high-order system's unmodeled dynamics problem,using conventional PID control algorithm is difficult to obtain good dynamic performance of the closed-loop system,this paper proposed the previous unmodeled dynamic compensation and PID control algorithm.Compared with the unmodeled dynamic compensation with neural network and PID control algorithm,this algorithm has the advantages of relatively simple structure,and is easy to be realized.In order to further study on high order system improved PID control algorithm,this algorithm is masked as a modular in Simulink.3.On the virtual-real high-order control system HILS platform,this paper compared the experiments of PI control algorithm and the previous unmodeled dynamic compensation and PI control algorithm for high-order systems.The experimental results show that,for high-order systems,the previous unmodeled dynamic compensation and PI control algorithm is better than PI control algorithm in improving the dynamic performance of the closed-loop system,as it can improve the response time and reduce the amount of overshoot.