Frequency sensitive unit commitment with availability-based tariff: an Indian example

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Frequency sensitive unit commitment with availability-based tariff: an Indian example

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Indian power systems are designed to operate at a nominal frequency of 50 Hz. They face hourly demands that exceed their generation capacity during certain hours of a day and operate at a lower frequency in those hours. In general, each state (province) has an electric utility with a generation capacity that comprises: (i) state (provincial) government owned generation plants, (ii) independent power producers (IPPs) and (iii) assigned portion of outputs of central (federal) government owned generation plants. The state government and central government plants and IPPs offer to sell energy to a State's utility through offer bids. A State's utility may draw additional power from a central generator in excess of its assigned portion of output and it is termed as an un-scheduled interchange (UI). The utility will pay for this UI to the central generator using an hourly tariff rate known as availability-based tariff (ABT). ABT is a function of the operating frequency. This study captures this operational model, ABT structure and proposes a mixed integer linear-programming formulation to optimally commit and schedule units in the utility for 24 h. The proposed model and results on actual data are reported. The system includes a pumped-hydro unit.

Inspec keywords: linear programming; government; power markets; power generation scheduling; power generation dispatch; pumped-storage power stations; integer programming

Other keywords: unscheduled interchange; availability based tariff; Indian power system; pumped hydrounit; mixed integer linear programming formulation; frequency sensitive unit commitment; electric utility; frequency 50 Hz; power generation plant; state government; ABT structure

Subjects: Pumped storage stations and plants; Optimisation techniques; Power system management, operation and economics

References

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    2. 2)
      • Geetha, T., Jayashankar, V.: `Generation dispatch with storage and renewables under availability based tariff', TENCON 2008, IEEE Region 10 Conf., November 2008, p. 1–6.
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      • Khaparde, S.A., Pentayya, P., Roy, A.: `Operating experience with regional interconnections in India', IEEE Power Engineering Society General Meeting, June 2005, p. 2528–2535, vol. 3.
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      • B. Bhushan . ABC of ABT – a primer on availability tariff.
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      • Khaparde, S.A.: `Tutorial on ABT and its implementation', 13thNPSC 2004, December 2004, Chennai.
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      • Bhushan, B., Roy, A., Pentayya, P.: `The Indian medicine', IEEE Power Engineering Society General Meeting, June 2004, p. 2336–2339, vol. 2.
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      • Economic Research Service (ERS): ‘India is the second fastest growing economy’, United States Department of Agriculture (USDA), available at http://www.ers.usda.gov/Briefing/India/, accessed August 2007.
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http://iet.metastore.ingenta.com/content/journals/10.1049/iet-gtd.2010.0760
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