1. Digital Control Systems & Digital PID Controller
Lei Xie
Institute of Industrial Control,
Zhejiang University, Hangzhou, P. R. China
2013/04/03

2. Problem Discussion
For an unknown stable temperature control system, can you determine PID parameters in Offline and Online tuning methods ?
Please realize the industrial PID controller in Simulink ?
For the fast flow control loop, show me your tuning principle and explain why.
For the AVERAGE level control loop, show me your tuning principle and explain why.
Explain the existing reason of reset windup and show me your prevention schemes

3. Contents Concept of Digital Control Systems
Selection of Digital Filters
Digital PID Controllers and Its Improved Version
Concept of Distributed Control Systems
Summary

4. Construction of Digital Control Systems
Analog Control System
Digital Control System

5. General Digital Controller

6. Digital Filters Median Filter (中值滤波器) Average Filter (平均滤波器)
Weighed Average Filter (加权平均滤波器)

7. Digital Filters (cont.)
First Order Filter (一阶滤波器)
Compare common-used digital filters
See ../PIDControl/DigitalFilter.mdl

8. Digital PID Positional Algorithm
Ideal analog PID algorithm
Digital PID positional algorithm （位置算法）

9. Digital PID Incremental Algorithm
Digital PID positional algorithm
Digital PID incremental algorithm（增量算法）

10. PID incremental algorithm with derivative action first
Digital PID incremental algorithm
Digital PID incremental algorithm with derivative action first （微分先行PID增量算法）

11. Industrial Digital PID Module
Problem: （1）Programming；（2）Smooth A/M switching；（3）Reset windup prevention

12. Configuration of Distributed Control Systems (DCS，集散控制系统)
Analyze the meaning of distributed control ?
Why do people prefer DCS ?

13. Summary for Single-loop PID Control
Control Objective
Determination of Process Characteristics
Type Selection of Control Valves
Action Selection of PID Controllers
Selection of PID Controller Types
Realization of PID Controller
Tuning of PID Parameters