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Electrical, Control and Communication Engineering

The Journal of Riga Technical University

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2255-9159
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Invariant Method of Load Independent Pressure Control in Steam Boiler

Professor Andris Sniders / Doctoral student Toms Komass
Published Online: 2013-01-31 | DOI: https://doi.org/10.2478/v10314-012-0001-4

Abstract

The paper considers the possibility of steam production and supply process improvement by perfection of the steam boiler control system, applying invariance principle that makes possible preemptive compensation of the influence of steam expenditure as a disturbance on the control process quality and efficiency. For the development of invariant control system, the mathematical modeling and simulation in MATLAB - SIMULINK environment is made. The control unit is low pressure steam boiler with one input impact to control - the heat flow of burning gas mixture fuel, one measured output parameter of the process - the steam pressure, and the main disturbance as a load impact - the steam expenditure. The mathematical and virtual models and block-diagrams for transient process simulation is compiled, allowing to start practical design and investigation of steam boiler invariant control system with high operation stability under essentially fluctuating load. The simulation results prove that the optimal solution for the transient process improvement in steam boiler, taking in account fluctuating load, is invariant PID-DPC two loop control system with disturbance impact on steam pressure preemptive compensation. Under invariant control the steam pressure overshoots decreases substantially in comparison with the traditional PID-feedback control method.

Keywords : Time invariant systems; pressure control; closed loop systems; computer simulation

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About the article

Professor Andris Sniders

Andris Šnīders. Dr.habil.sc.ing., professor, Latvia University of Agriculture (LUA) Institute of Agricultural Energetics (IAE). Professor Andris Šnīders has been working at the Faculty of Engineering (FE) LUA since 1972 and director of IAE (1999 – 2007). He has an Electrical Engineer Diploma (Riga Polytechnic Institute -1972), Candidate degree in Technical Sciences (Celyabinsk, Russia - 1982), PhD degree (1992) and Doctor Habilitus degree (1993) in Agricultural power engineering - Jelgava, Latvia, FE LUA. He has participated in several projects, related to electrical and heat power engineering, waste water treatment control, energy efficiency and study process perfection, as well as is an author of more than 150 publications, incl., 4 books and 12 teaching appliances. The main research area is automatic control and modelling in water technologies and power supply engineering systems, virtual modelling of non-stationary technological units and systems, induction motors thermal overloads and protection.

Doctoral student Toms Komass

Toms Komass. M.sc.ing., PhD - student at Latvia University of Agriculture, Institute of Agricultural Energetics. Toms Komass has worked at Company “ABB” in the capacity of programming engineer (2008-2010) and as a project supervisor (2010-2011). Since 2012 he is a mechatronics engineer at Agro-industrial Company “Balticovo”. Toms Komass has got a Diploma of Mechatronics Engineer (2010) and Master’s Degree (2011) at Riga Technical University. He has participated in several projects, related to process control in heat, electrical, water, wind and agro-industrial technologies. The main research area is automatic control and modelling of district heating.


Published Online: 2013-01-31

Published in Print: 2012-12-01


Citation Information: Electrical, Control and Communication Engineering, ISSN (Online) 2255-9159, ISSN (Print) 2255-9140, DOI: https://doi.org/10.2478/v10314-012-0001-4.

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