A Power Flow Method for Radial Distribution Feeders with DER Penetration

Panagiotis M. Anagnostopoulos; Stavros A. Papathanassiou

doi:10.6000/1929-6002.2019.08.01

Authors

Panagiotis M. Anagnostopoulos School of Electrical and Computer Engineering, National Technical University of Athens (NTUA), 9 Iroon Polytechniou str., 15780 Athens
Stavros A. Papathanassiou School of Electrical and Computer Engineering, National Technical University of Athens (NTUA), 9 Iroon Polytechniou str., 15780 Athens

DOI:

https://doi.org/10.6000/1929-6002.2019.08.01

Keywords:

Distribution power flow, voltage calculation, power losses calculation, distributed energy resources, DistFlow, ModDistFlow.

Abstract

This paper presents a novel power flow method suitable for radial distribution feeders, which consists a modification of the simplified power flow concept known as the DistFlow method, already available in the literature. The proposed method relies upon a differentiated manipulation of power losses, which are taken into account in voltage calculations, unlike other simplified methods, where losses are totally neglected. As a result, calculation accuracy is greatly improved, in terms of node voltages, losses and overall active & reactive power flows. In addition, the proposed method is non-iterative and entirely linear, being easily implementable and fast in execution. The method is particularly suited for feeders with a high penetration of Distributed Energy Resources (DER), providing results that closely match those of a full non-linear power flow and are considerably more accurate than the traditional linearized distribution power flow methods, without any increase in computational burden. The new method is applied to a variety of case studies in the paper, to demonstrate its accuracy and effectiveness, comparing its performance with the simplified (linearized) DistFlow and a conventional non-linear power flow method.

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