Under the electricity market, there are some new changes for provincial grid companies to purchase power. Besides most fixed contract of purchasing power, some free purchase room is existed in certain condition. At first overall thinking of purchase optimization in provincial grid corporation is discussed in this paper. Then a system of discriminated process is puts forward, which helps to establish models to purchase quantity and purchase cost in the different conditions, and a optimal purchase model is build under free purchasing room existed. Finally, a example improve the method through a set of real data of a province. The result believes that the method can afford reliable and reasonable assistant decisionmaking for purchase optimization of provincial grid companies.
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