Table of Contents
ISRN Power Engineering
Volume 2014 (2014), Article ID 742171, 12 pages
Research Article

Computational Techniques for Autonomous Microgrid Load Flow Analysis

Department of Electrical and Electronics Engineering, National Institute of Technology, Tiruchirappalli 620015, India

Received 25 January 2014; Accepted 17 March 2014; Published 11 May 2014

Academic Editors: Q. Guo and B. Zhang

Copyright © 2014 M. Venkata Kirthiga and S. Arul Daniel. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


This paper attempts at developing simple, efficient, and fast converging load flow analysis techniques tailored to autonomous microgrids. Two modified backward forward sweep techniques have been developed in this work where the largest generator is chosen as slack generator, in the first method and all generator buses are modeled as slack buses in the second method. The second method incorporates the concept of distributed slack bus to update the real and reactive power generations in the microgrid. This paper has details on the development of these two methodologies and the efficacy of these methods is compared with the conventional Newton Raphson load flow method. The standard 33-bus distribution system has been transformed into an autonomous microgrid and used for evaluation of the proposed load flow methodologies. Matlab coding has been developed for validating the results.