Abstract

We present a new method to analyze the bidding price of each participant (power suppliers and large consumers) in a pay-as-bid market. The bidding price will be decomposed into a variety of components corresponding to five factors, such as the incremental values of the subject bidder's generation on the system operational costs, on the income or payment of other bidders, and on the binding tradable constraints, and the first-order approximation of the subjective participant's bidding price. From an economic viewpoint, each component provides useful information for participants to design the strategic planning. The advantages of the method include that the decomposition is well defined without assumptions and that each decomposition term has its own economical and/or engineering meaning. The proposed method is numerically verified through computer simulations on a three-bus example system and a modified IEEE 30-bus power system with both generator and large consumer bidding.

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