NDLI: Variable speed operation of turbogenerators to improve part-load efficiency

Content Provider	IEEE Xplore Digital Library
Author	Dan Li Dougal, R.A. Thirunavukarasu, E. Ouroua, A.
Copyright Year	2013
Description	Author affiliation: Dept. of Electr. Eng., Univ. of South Carolina, Columbia, SC, USA (Dan Li; Dougal, R.A.) \|\| Dept. of Mech. Eng., Univ. of South Carolina, Columbia, SC, USA (Thirunavukarasu, E.) \|\| Center for Electromech., Univ. of Texas at Austin, Austin, TX, USA (Ouroua, A.)
Abstract	Our investigation of variable speed operation of turbogenerators, including both single-shaft and twin-shaft variants, shows significant opportunities to improve part-load efficiency in those certain electrical power generation applications that permit variable speed operation. Efficiency improvement increases as load decreases and the improvement is larger for single-shaft engines than for twin-shaft engines. For example, when operating at 20% loading, adjusting the engine speed can improve fuel efficiency by 14% for single-shaft gas turbines, and by 2% for twin-shaft gas turbines. In addition, we present a semi-theoretical analysis that provides a procedure to obtain the gas turbine optimal efficiency and its corresponding optimal speed as a function of shaft load. Simulation results of part-load variable speed modeling of gas turbines further confirmed the theoretical analysis. This has important practical implications. An analysis of fuel consumption by a gas turbine that operates with a load profile representative of a typical propulsion profile for a DDG51 ship, shows a 15% reduction in fuel consumption when variable speed operation is used, as compared to fixed speed operation. In addition, the analysis presented in this paper provides a general method to evaluate the steady-state performance of gas turbines operating with variable speed.
Sponsorship	IEEE Power Energy Soc.
Starting Page	353
Ending Page	359
File Size	1835874
Page Count	7
File Format	PDF
ISBN	9781467352437
e-ISBN	9781467352451
DOI	10.1109/ESTS.2013.6523760
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2013-04-22
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Shafts gas turbines Fuel consumption variable speed Mathematical model Fuels Turbines Engines Load modeling off-design performance
Content Type	Text
Resource Type	Article

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