Mixed Method for Transmission Loss Allocation

The paper presents a method for transmission loss allocation developed as a mix of Zbus transmission cost allocation method and power summation method for loss allocation. Zbus method is used to decompose the power flows through the branches in the network and to calculate the participation of each network user (node power injection) in the active and reactive power flow at each branch of the network. When this information is obtained, power summation method principle with quadratic allocation of crossed terms of active and reactive power is used for allocation of losses of each branch to network users (node power injections). Sum of allocated losses to network users (nodes) from all branches in the network presents total loss allocation to each node. This is the reason why the method is called mixed method. The method is tested on real data individual model of power system of North Macedonia for future planning purposes. The model is with high presence of renewables (PV and WIND). The results are presented and discussed.