Download Steam Net Simulation with Real Control System

Department of Automatic Control
Lund Institute of Technology
Box 118
SE-221 00 Lund Sweden
Author(s)
Document name
MASTER THESIS
Date of issue
January 2003
Document Number
ISRN LUTFD2/TFRT--5701--SE
Supervisor
Oscar Ljungkrantz
Anders Rantzer, LTH
Magnus Holmgren, Solvina
Sponsoring organization
Title and subtitle
Steam Net Simulation with Real Control System(Ångnätssimulering med verkligt styrsystem)
Abstract
This master thesis has been conducted for Solvina. Solvina is a firm in Gothenburg, which among other
things simulate steam nets for the paper process industry. Doing this Solvina has had to simulate not
only the steam net itself, but also to simulate the control system. The purpose of this master thesis was to
try to build an interface between the controller and the simulated process so that the simulated steam net
could be controlled by the real control system.
The process is modelled in Dymola/Modelica. The control system is built in Siemens process control
system called Simatic PCS 7 and runs on a PC. The simulated process and the control system run on the
same PC and the communication between the process and the control system is a communication between
two applications running on the same operative system, which is Windows NT. The two applications
communicate with each other by reading from and writing to a common file. The simulated process in
Dymola calls a C++ function that reads the control signals from the file and writes the process values to
the file, every sampling time. A J++ program communicates with the control system and writes the
control signals to the file and reads the process values from the file, every sampling time. The
communication is synchronized and the applications access the file using mutual exclusion.
Keywords
Classification system and/or index terms (if any)
Supplementary bibliographical information
ISSN and key title
ISBN
0280-5316
Language
English
Number of pages
58
Recipient’s notes
Security classification
The report may be ordered from the Department of Automatic Control or borrowed through:
University Library 2, Box 3, SE-221 00 Lund, Sweden
Fax +46 46 222 44 22
E-mail [email protected]