Transfer Management Of The Electricity Market

Electricity market is the inevitable trend of electrical industry in developing. It result in the change of the conventional power system in organization, and cause a series of new technique problems. The paper focus on three aspects of transmission management of electricity market, loss allocation, transmission cost allocation and congestion management. First several widely used loss allocation rules are discussed and a new method for loss allocation is proposed. The new method is based on the rigorous mathematical derivation and fully concerned about the interaction between active and reactive powers. Then several popular transmission pricing schemes are investigated. To overcome the deficiencies of the traditional methods using active power share of elements' passing power to judge the extent of use to the device, a new concept regarding share of usage of transmission devices is put forward. The concept is based on loss share but not active power share. Considering the operation condition of practical power system, the new concept has explicit physical meanings and ease to be accepted by market members. Based on the proposed loss allocation rule, a new complex power flow tracing method is put forward, which can be used for power pool model to determine the contributions of individual loads/generators to branch real and reactive power loss and MVA flow and then to allocate transmission cost. To deal with the cost allocation problem in composite market environment including both power pool trade and bilateral/multilateral trade, an original method called Shapely Value is introduced at first. Then the flow chart for cost allocation based on EMS/SCADA is designed. As to congestion management, two congestion pricing methods are studied. One is Aumann-Shapley method and the other is based on the usage to the congestion device, which are capable of eliminating the merchandise surplus. At last, the methods for cutting contract for eliminating the congestion effectively in the bilateral/multilateral market model are studied. Object-oriented technique is employed to design the transmission management software.