Improvement of thermal efficiency for combined cycle power plant during load following operation

Author

Matsumoto, H. ; Takahasi, S.

Author_Institution

Res. Lab., Hitachi Ltd., Ibaraki, Japan

Volume

14

Issue

3

fYear

1999

fDate

9/1/1999 12:00:00 AM

Firstpage

787

Lastpage

794

Abstract

An optimization method for unit startup and shutdown timing in the load control system is proposed for combined cycle power plants to improve thermal efficiency during load following operation. The optimum timings are derived from regression equations obtained through offline dynamics simulation analysis. The system is applied to a simulation for a plant of a three-pressure staged reheat type (1650 MW rated capacity) which consists of seven units, and the following points are seen: (1) the larger the load change amount is, the earlier the recommended additional startup timing is; (2) the tendency described in (1) is more remarkable when the load change is faster; and (3) thermal efficiency is expected to be increased by 9% compared with the conventional method

Keywords

combined cycle power stations; control system analysis; control system synthesis; optimal control; power station control; power station load; starting; statistical analysis; thermal analysis; 1650 MW; combined cycle power plant; control design; control simulation; load change; load control system; load following operation; offline dynamics simulation analysis; optimum timings; regression equations; thermal efficiency improvement; unit shutdown timing; unit startup timing; Analytical models; Equations; Knowledge engineering; Load flow control; Optimization methods; Power generation; Power generation economics; Thermal loading; Timing; Turbines;

fLanguage

English

Journal_Title

Energy Conversion, IEEE Transactions on

Publisher

ieee

ISSN

0885-8969

Type

jour

DOI

10.1109/60.790952

Filename

790952