Dynamic Characteristic Identification Of Heat-exchanger & Simulation For Energy-control System In Heating Station Based On Matlab

With rapid development of China comprehensive power and deepening of industrialization, the lack of energy resulted from high energy resources wastage will restrain China's economy development . Perfecting city central heating can solve problems of energy lack, especially to Northwest China and Northeast China, and improve residential environment and living standard for people in towns. After studying foreign advanced technology, the author try to develop simulation trainingsystem for the heating station, which can save foreign exchange for our nation and meet domestic enterprise's demand.This thesis utilizes reasonable and simple measures for simulation , studies security and stability of automation system for heat-exchanger in order to perfect the running of heat-exchange equipment.Matlab/simulink is a software for modeling , simulation and analysis to dynamic system, which can enhance the efficiency and reliability. Matlab's optimization toolbox offers series of functions for non-restraint and restraint problems , easily getting nonlinear function's maximum and minimum values. This thesis combines simulation and optimization to realize parameter's optimization for the PID controller, with the help of Simulink and Matlab toolbox.This thesis develops the dynamic simulation and control system for heat-exchanger in heating substation and central heating network , basing on the well-knownpowerful software Matlab.First , according to the basic running regulation formula , the outdoor temperature and the secondary average one of supply and back water conform to a single- function relationship. Meanwhile , the secondary average temperature is determined as the controlled parameter for heating system in that it can directly reflect the change of heating supply in main heating station , radiator's emitting heat, or heat load.Second, the dynamic model of heat-exchanger is showed by the way of system identification after experiment, based on which, a convenient GUI demo is provided . With appropriate changes of flow rate and frequency entered, it can automatically plot the step response of system outlet amount.Third, the energy-control system model for heat substation is made by the MATLAB/SIMULINK blockset, and the dynamic simulation for the secondary average temperature is given under changing situation of thefirst-side water flow rate and the steam flow rate of steam-water heat-exchanger in the main heating station .Finally, in view of the parameter confirmation for PID controller, three main parameters Kp, Ki, and Kd, is automatically optimized with the MATLAB/NCD blockset employed, which is much useful to decrease the dependence to subjective experience of experimenter.