A Study on Automatic Control of Steam Turbines of Fossil Power 外文文献.pdfVIP

A Study on Automatic Control of Steam Turbines of Fossil Power Plant with Thermpal Stress Constraints in Turbine Rotors Seong Woo Kwak and Byung Kook Kim Department of Electrical Engineering Korea Advanced Institute of Science and Technology 373-1 Kusong-dong, Yusong-gu, Taejon 305-701 Korea Phone: +82-042-869-5435 / 3435 FAX: +82-042-869-3410 email: kswBigaia.kaist .ac. kr/bkkim Qeekaist .kaist .ac. kr Abstract - A new fuzzy turbine load scheduler The methods used to cope with this problem are is suggested for fast start-up/shut-dlown and load the off-line schedule control system of Hanzalek and variation of fossil power plants. The turbine load Ipsen[S] in which the startup schedule is determined scheduler determines the load increase/decrease from the turbine inlet steam conditions and the metal rate by predicting steam conditions and calculat- temperature prior to startup, and optimization control ing thermal stresses in the turbine rortors. Our load method of Bednarsky and Shen [lo] in which they ap- scheduler determines the load variation rate using proach this subject as a minmax problem, and Hitachi fuzzy rules based on expert’s knowledge concern- control method which uses an auto-regressive dynam- ing thermal stresses in the turbine rotors. A su- ic model to predict boiler outlet steam conditions and pervisory inference engine is added to update the evaluates thermal stress on the basis of the predicted expert’s rules and to cope with time variations of boiler outlet steam conditions[2][3]. the plant, The