DocumentCode :
1399748
Title :
Optimization of a load shedding scheme
Author :
Grewal, Gursharan S. ; Konowalec, John W. ; Hakim, Mak
Author_Institution :
Syncrude Canada Ltd., Fort McMurray, Alta., Canada
Volume :
4
Issue :
4
fYear :
1998
Firstpage :
25
Lastpage :
30
Abstract :
An integrated process facility recently went through an update of its existing load shedding scheme in the context of process changes planned for the coming years. Transient simulations indicated that by changing the load shedding philosophy, the frequency profile during power shortages could be significantly improved. This article discusses the plant´s electrical/steam load balance issues and the development of a high speed load shedding scheme. Shortage of power in a network is invariably reflected in collapse of frequency. Traditionally, frequency decay patterns have been calculated using simplified methods. Simplifications have included the assumption of constant deceleration constant voltages, and constant generator power. The results obtained using the simplified methods were generally adequate for simple, slow-acting load shedding systems. In the case at hand, the loads assigned for shedding and those to be “saved“ by load shedding are part of an integrated process plant sequence, where speed of operation and selectivity of the load shedding is crucial to the continuity of the oil-production process. In the search for ways to optimize the load shedding scheme, transient stability simulations were used to calculate frequency profile, taking into account generators´ transient responses and those of the excitation and speed governor systems. This article describes the outcome of the analysis in terms of possible improvements in load shedding performance through the use of rate of change of frequency as the shedding indicator
Keywords :
cogeneration; control system analysis; distributed control; industrial power systems; load shedding; oil technology; optimal control; power system control; project engineering; Canada; cogeneration system; control simulation; excitation system; frequency collapse; frequency decay patterns; generator transient responses; industrial power network; integrated process facility; load shed selectivity; load shedding optimisation scheme; oil-production process; power shortage; projects; speed governor system; Boilers; Distributed power generation; Frequency; Guidelines; Performance analysis; Petroleum; Power generation; Power system interconnection; Stability; Turbines; Voltage;
fLanguage :
English
Journal_Title :
Industry Applications Magazine, IEEE
Publisher :
ieee
ISSN :
1077-2618
Type :
jour
DOI :
10.1109/2943.692523
Filename :
692523
Link To Document :
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