With maturing deregulated environment for electricity market, cost of transmission congestion becomes a major issue for power system operation. Uniform Marginal Price and Locational Mar-ginal Price (LMP) are the two practical pricing schemes on energy pricing and congestion cost allo-cation, which are based on different mechanisms. In this paper, these two pricing schemes are in-troduced in detail respectively. Also, the modified IEEE-14-bus system is used as a test system to calculate the allocated congestion cost by using these two pricing schemes.
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