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Research Papers: Gas Turbines: Electric Power

Thermo-Economic Evaluation of Solar Thermal and Photovoltaic Hybridization Options for Combined-Cycle Power Plants

[+] Author and Article Information
James Spelling

Department of Energy Technology,
KTH Royal Institute of Technology,
Stockholm SE-100 44, Sweden
e-mail: james.spelling@energy.kth.se

Björn Laumert

Department of Energy Technology,
KTH Royal Institute of Technology,
Stockholm SE-100 44, Sweden
e-mail: bjorn.laumert@energy.kth.se

1Corresponding author.

Contributed by the Electric Power Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received July 22, 2014; final manuscript received July 23, 2014; published online October 7, 2014. Editor: David Wisler.

J. Eng. Gas Turbines Power 137(3), 031801 (Oct 07, 2014) (11 pages) Paper No: GTP-14-1425; doi: 10.1115/1.4028396 History: Received July 22, 2014; Revised July 23, 2014

The hybridization of combined-cycle power plants with solar energy is an attractive means of reducing carbon dioxide (CO2) emissions from gas-based power generation. However, the construction of the first generation of commercial hybrid power plants will present the designer with a large number of choices. To assist decision making, a thermo-economic study has been performed for three different hybrid power plant configurations, including both solar thermal and photovoltaic hybridization options. Solar photovoltaic combined-cycle (SPVCC) power plants were shown to be able to integrate up to 63% solar energy on an annual basis, whereas hybrid gas turbine combined-cycle (HGTCC) systems provide the lowest cost of solar electricity, with costs only 2.1% higher than a reference, unmodified combined-cycle power plant. The integrated solar combined-cycle (ISCC) configuration has been shown to be economically unattractive.

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Figures

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Fig. 1

Historical evolution of gas turbine turbine entry temperatures; data taken from Rubensdörffer [6]

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Fig. 2

Solar thermal and photovoltaic hybridization options for CCGT power plants

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Fig. 3

Typical operation of an SPVCC power plant

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Fig. 4

Typical operation of an ISCC power plant

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Fig. 5

Typical operation of an HGTCC power plant

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Fig.6

Solar integration into the topping gas turbine

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Fig. 7

Flowsheet of the modeling strategy adopted in the thermo-economic analysis tool

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Fig. 8

Fixed and variable heat rate model for thermal power cycle modeling

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Fig. 9

Annual solar share as a function of the additional investment in power plant equipment

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Fig. 10

LCOE as a function of the annual solar share for the hybrid CCGT power plants

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Fig. 11

Mean annual CCGT power block efficiency as a function of the annual solar share

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Fig. 12

Annual capacity factors for the hybrid CCGT power block as a function of the annual solar share

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Fig. 13

Specific CO2 emissions as a function of the annual solar share for the hybrid CCGT power plants

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Fig. 14

Day-time shutdown of an SPVCC power plant

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Fig. 15

Influence of day-time shutdown on the LCOE

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Fig. 16

Influence of changing technical limits on the overall LCOE of the hybrid CCGT power plants

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Fig. 17

Optimal design parameters of the ISCC and HGTCC power plant as a function of the annual solar share

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Fig. 18

Levelized electricity cost as a function of the annual solar share for the hybrid CCGT power plants

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