A Method of Spot Price Bidding in Day-Ahead Power Market With the consideration of power shortage factor

摘要

Under the environment of electric power market, it is important for generation owners or dealers how to evaluate the pool marginal price so that their forward competitive bid in every division of the time period could no larger than that of the marginal price in corresponding period. This paper put forward a method to calculate spot prices which both take into consideration of the generation cost and the relation between energy supply and demand in power supply areas. This paper takes the Shanghai Power Market as the research object, following the regulation of the Shanghai Competitive Operation Center (SCOC), the spot generating schedule and the respective spot price will unchangeable after finishing the day ahead competitive bid. Based on this rule, this paper divides day-ahead spot price into tow parts, one is calculated from variable generation cost, and another part will be evaluated from energy supply and demand curve by the power shortage factor. This paper sets up a model to calculate the power shortage factor and to describe the relation between the day-ahead load prediction curve and the electric energy supply curve. A practical example proved that use upon method, the spot bidding approach the pool purchase price in a comfortable range.