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All Journal International Journal of Power Electronics and Drive Systems (IJPEDS) International Journal of Eco-Innovation in Science and Engineering (IJEISE)
Paoprasert, Naraphorn
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Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Electrical & Electronics Engineering Engineering Industrial & Manufacturing Engineering Mechanical Engineering

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Comparison between the multi-shaft and the single-shaft combined cycle power plants Chaitrak, Kanticha; Paoprasert, Naraphorn; Anussornnitisarn, Pornthep
International Journal of Power Electronics and Drive Systems (IJPEDS) Vol 14, No 4: December 2023
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijpeds.v14.i4.pp2064-2071

Abstract

A multi-shaft system has been adopted by power plants in Thailand for decades; however, for newer units, single-shaft systems have become more popular. This paper compared reliability measures—the system means failure rate, system mean repair rate, and system unavailability indices—between multi-shaft and single-shaft combined cycle power plants (CCPPs). The results showed that the long-term system availability of one multi-shaft CCPP was higher than each of the single-shaft units by 40.70%. In addition, the multi-shaft unit had a 42.14% longer mean time to failure (MTTF) than the single-shaft unit. Finally, the multi-shaft CCPP had 34.59% higher expected capacity than that of the single-shaft system.
Feasibility Study for Investment in VSPP Solar Power Plant in Thailand Using GIS and Financial Ratanasuwan, Rachata; Paoprasert, Naraphorn; Yousuk, Ramidayu
International Journal of Eco-Innovation in Science and Engineering (IJEISE) Vol. 6 No. 1 (2025): IJEISE
Publisher : UPN Veteran Jatim

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Abstract

The study aims to evaluate the financial feasibility and land suitability for investment in VSPP solar plant in Thailand using Geographic Information System (GIS) and financial modeling techniques. The study analyze key parameters, including photovoltaic power output (PVOUT), land price, and distance from existing infrastructure. The methodology comprises GIS-based spatial analysis and financial performance assessment using indicators consisting of the Net Present Value (NPV), the Project Internal Rate of Return (PIRR), the Equity Internal Rate of Return (EIRR), and the simple payback period (SPB) to identify area and location for investment in VSPP solar power plant. The study areas were categorized into three groups based on the values of PVOUT - the 10% lowest PVOUT (Group 1), middle range PVOUT (45%-55%) (Group 2), and 10% highest PVOUT (Group 3). The results indicated that locations with the highest 10% PVOUT (Group 3) demonstrated the best financial performance, with an NPV of approximately 15 million THB, PIRR of 9.75%, EIRR of 11.50%, and a SPB of 9.25 years. Conversely, locations with the lowest 10% PVOUT (Group 1) were financially infeasible.
Co-Authors Anussornnitisarn, Pornthep Chaitrak, Kanticha Ratanasuwan, Rachata Yousuk, Ramidayu