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Abstract

In recent years, the deregulation of power companies has been a subject of discussion in many countries. However, irrespective of the degree of deregulation of a power industry, its power systems still have the same basic structure for power generation, transmission, distribution and the end user. In most countries, the power industry has institutions dedicated to achieving improvements in its power systems in order to maintain reliable power supply. Power companies often establish power interchange support mechanisms with nearby power systems to ensure a stable power supply. One such mechanism is “power intrachange,” wherein a power system can compensate for regional power shortages by purchasing the surplus electricity of a cogeneration system and/or from an independent power producer located inside or outside the region. Power intrachange can compensate for insufficient spinning reserve, line congestion, limited quantities of specific fuel, and high operational costs. In this paper, an executive model of power intrachange is studied and their efficiency analysis is conducted. Further, as an example, we use the high-fuel-cost gas turbine units that were activated in 2005 because of heavy load and line congestion in the northern area of Taiwan. After the calculations, we find that the Taiwan Power Company could not only solve the regional line congestion problem but also save 3,208.59 kNT$ by implementing the line congestion power intrachange mechanism when the line congestion occurred.

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