Improved economic dispatch of power systems. Volume 2. Appendixes. Final report
EPRI RP 1048-3, Improved Dispatch Methods, has investigated the feasibility (from the generating unit viewpoint) of updating economic dispatch system Input/Output (I/O) curves. It appears that many factors which influence the I/O curves can be adequately measured using today's instrumentation technology, thus permitting the unit cost vs. load curve to be frequently updated. It also appears that it may be possible to perform turbine heat rate testing in a much shorter period of time than currently required if an automated data collection system is used. The results of this project indicate that substantial savings can result from keeping the I/O curves updated: $1544 per day for a 130 MW unit with its high pressure feedwater heaters out of service for repair of tube leaks; and $697 per day for a 190 MW unit experiencing problems with condenser vacuum. It is difficult to project these savings into a yearly savings since the length and frequency of outages must be estimated. An assumption of a heater leak every two months and 20 days per year of abnormal condenser conditions would result in a savings of $23,204 per year. A program for a dynamic rate limiter for a generating unit was also tested as part of this project. This algorithm appears to have a significant advantage over a rate limiter which uses a fixed rate-of-change, since the dynamic system automatically adjusts itself to the current unit operating conditions. This insures as conservative a rate as actually necessary under poor operating conditions without penalizing unit response under better conditions. This volume presents the following: definitions of terms; utility and vendor survey questions and responses; steam turbine historical base data; gas turbine model and historical data; and test procedures, detailed test data, and analysis of results.
- Research Organization:
- Philadelphia Electric Co., PA (USA). Research and Testing Div.
- OSTI ID:
- 5161589
- Report Number(s):
- EPRI-EL-2461-Vol.2; ON: DE82906424
- Country of Publication:
- United States
- Language:
- English
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