This paper introduces a multi-regional electricity trade study for the Southern African Power Pool (SAPP). A unique mathematical model was developed for the hydrothermal scheduling/commitment and dispatch of the diverse systems of the region. All of the international interconnections were considered in the formulation, as were the major transmission lines inside the regions. The model quantified new trade arrangement that could minimize the operating cost of the region. The model was fully discussed in a SAPP/Purdue workshop, held at Purdue University, August 19 to September 3, 1997. All parameters and data were verified by the delegates from the SAPP. Preliminary results show that much higher trade quantities can be realized compared with the existing long term contracts. The results from the new policy showed a typical day cost reduction of about 6.2
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