Two new methods for power flow tracing using bus power balance equations

Noradin Ghadimi

(Young Researchers Club, Ardabil Branch, Islamic Azad University, Ardabil, Iran)

Abstract:Two new methods were presented for power flow tracing (PFT). These two methods were compared and the results were discussed in detail. Both methods use the active and reactive power balance equations at each bus in order to solve the tracing problem. The first method considers the proportional sharing assumption while the second one uses the circuit laws to find the relationship between power inflows and outflows through each line, generator and load connected to each bus of the network. Both methods are able to handle loop flow and loss issues in tracing problem. A formulation is also proposed to find the share of each unit in provision of each load. These methods are applied to find the producer and consumer’s shares on the cost of transmission for each line in different case studies. As the results of these studies show, both methods can effectively solve the PFT problem.

Key words:load contribution; power flow tracing; proportional/non-proportional sharing; network Z_bus; transmission cost allocation