A New Approach to Transmission Loss Allocation

The article deals with the allocation of losses in the transmission system. The transmission losses are nonlinear functions of power flows in the lines of the system and thus it is not possible to associate directly a given user (generator or load) with a corresponding part of the transmission losses. However, a procedure that allows assigning the responsibility of users for a part of the losses must be applied This process is called transmission loss allocation. The article focuses on allocation methods using incremental transmission loss coefficients. A new allocating method of this type is proposed. It uses incremental transmission loss coefficient solution based on the bus impedance matrix. The proposed method together with two other known approaches (pro rata allocation and proportional sharing allocation) is tested on three sample systems (five, fourteen a twenty-three buses), in each case both for voltage-dependent load characteristics and constants loads. In the final part of the article, the results of simulation are discussed from the point of view of the possible practical application of the treated methods.