【正文】 VI 結(jié) 論 ...................................................................................................................... 47 致 謝 ...................................................................................................................... 48 參考文獻(xiàn) .................................................................................................................. 49 附錄 1 設(shè)計(jì)系統(tǒng)部分源代碼 .............................................................................51 附錄 2 系統(tǒng)硬件圖 ............................................................................................54 VII CONTENTS ABSTRACT................................................................................................................ I ABSTRACT.............................................................................................................. III Chapter 1 Introduction............................................................................................ 1 Design background and significance of a....................................................... 1 Research status ................................................................................................. 2 Design Objective.............................................................................................. 4 Chapter 2 HRSG steam temperature control system design ............................. 6 Control scheme selection................................................................................. 6 Factors affecting the superheated steam temperature ............................. 6 Singleloop control scheme...................................................................... 9 Cascade Control Programme ................................................................. 10 Feedforward control program ................................................................ 12 Comparison of control schemes and programs identified ........................... 14 Comparison of 11 control scheme ......................................................... 14 The program identified ........................................................................... 15 Chapter 3 Hardware Design ................................................................................. 16 System Block Diagram .................................................................................. 16 With 8155 microcontroller interface circuit ................................................. 17 Signal input section ....................................................................................... 17 The temperature signal acquisition and processing .............................. 18 A / D converter ........................................................................................ 19 Shows the circuit design ................................................................................ 19 Signal output section ..................................................................................... 21 VIII D / A converter ........................................................................................ 21 420mA standard signal output .............................................................. 22 Serial Communication between PC Circuit.................................................. 22 Alarm Circuit Design ..................................................................................... 23 Keyboard Circuit Design ............................................................................... 24 Regulated Power Supply Circuit Design ...................................................... 25 Minimum System Microcontroller ............................................................. 26 Clock Circuit......................................................................................... 26 Reset Circuit ......................................................................................... 27 Chapter 4 System Software Design...................................................................... 28 Software design ideas .................................................................................... 28 System software flow chart ........................................................................... 28 The main program flow chart................................................................. 28 The sampling subroutine ........................................................................ 30 Software Design Display link ................................................................ 30 Interrupt Service ..................................................................................... 30 Digital Filter............................................................................................ 33 PC control software design .................................................................... 34 PID subroutine ........................................................................................ 35 Chapter 5 System Simulation ............................................................................... 38 Simulation Tools ............................................................................................ 38 MATLAB and fuzzy logic toolbox and simulation environment ................ 38 MATLAB Overview ............................................................................... 38 Fuzzy Logic Toolbox .............................................................................. 39 PID algorithm design and analysis ............................................................... 40 Determination of the control algorithm................................................. 40 IX Mathematical Model ..