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An Estimation Technique to Assign Contribution Factors for Loop Flows in an Interconnected Power System

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This article describes the significance of loop flows in an interconnected electric power system. Loop flows (unscheduled flows) are the difference between scheduled and actual power flows. A brief discussion of the consequences of loop flow is given. The article illustrates a new method of identifying the contributions of the loop flows occurring in a system to the participating utilities by means of a contribution factor matrix. A method to estimate the loop flows in the system using a type of Lp estimation is described, and the estimation technique is further employed in designing the contribution factor matrix. The potential application is in transmission pricing.

Keywords: Moore-Penrose pseudoinverse; circulating flow; electricity markets; interconnected networks; loop flow; loops; parallel flow; state estimation

Document Type: Research Article


Affiliations: Arizona State University, Tempe, Arizona, USA

Publication date: August 1, 2004

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