Unit Commitment in Congested Transmission Systems
The presence of physical limitations on the amount of power that may be transferred through a given transmission line gives rise to a very vigorous debate on how to account for these limits in a deregulated utility environment. Many pricing schemes that account for line flow limits are being discussed and debated [10, 11, 23, 35], but no consensus has been reached. This uncertainty makes it difficult to predict the effects of congestion on a power producer. Congestion will likely change the prices of power as well as reserve, but maximum generation limits at certain locations may also be implemented. If no such limits are present, then the strategy for selling power and unit commitment is essentially as described in the previous chapters, with the only difference being that the price for power reflects the presence of congestion, and the price process must model the price that the generator actually receives. If congestion does impose limits on power generation for a given producer, then a more complicated model is needed.
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