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Research Papers: Gas Turbines: Controls, Diagnostics, and Instrumentation

Power Reserve Control for Gas Turbines in Combined Cycle Applications

[+] Author and Article Information
Eric A. Müller, Andrew Wihler

 Alstom Power, 5401 Baden, Switzerland

In a sequential combustion engine, two distinct mixed turbine inlet temperatures are distinguished.

In the case of a sequential combustion engine, TIT shall be representative for the mixed inlet temperature of the low pressure turbine.

Positions that correspond to the maximum power output.

J. Eng. Gas Turbines Power 134(1), 011601 (Nov 04, 2011) (8 pages) doi:10.1115/1.4004188 History: Received April 28, 2011; Revised April 28, 2011; Published November 04, 2011; Online November 04, 2011

In order to be able to optimally operate a combined cycle power plant in a liberalized electricity market, knowledge of the plant’s maximum exportable power generation capacity is vital. However, the maximum power output of a power plant is affected by numerous variable factors, such as the ambient conditions at the plant site. In addition, the allowable plant operating range might be narrowed by a compulsory reserve margin, if the power plant is participating in a frequency regulation program. In this paper, a power reserve controller is derived, which facilitates the optimal operation of a combined cycle gas turbine power plant subject to a reserve margin requirement. The power reserve controller is based on a mathematical description of the power plant and uses an adaptation mechanism to predict on a real-time basis the maximum allowable plant load limit. Based on tests on a single shaft combined cycle power plant, the operation of the power reserve controller is demonstrated and its performance is assessed. The test results prove that the controller predicts the maximum power output of the plant with high accuracy and that it is able to maintain a desired reserve capacity for frequency response as specified.

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Copyright © 2012 by American Society of Mechanical Engineers
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Figures

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Figure 1

Schematic of a combined cycle gas turbine power plant with load control system

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Figure 2

Model validation results

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Figure 3

Signal flow chart of the power reserve controller

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Figure 4

Power reserve specification and plant step response to maximum load

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Figure 5

Integration of the power reserve controller into the load control system of the plant

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Figure 6

Evaluation of the functionality and performance of the power reserve controller

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