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The Scientific World Journal
Volume 2015 (2015), Article ID 654942, 11 pages
Research Article

Over/Undervoltage and Undervoltage Shift of Hybrid Islanding Detection Method of Distributed Generation

Department of Electrical Engineering, Faculty of Engineering, Chiang Mai University, Chiang Mai 50200, Thailand

Received 17 June 2014; Accepted 30 October 2014

Academic Editor: Hua Bai

Copyright © 2015 Manop Yingram and Suttichai Premrudeepreechacharn. 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.


The mainly used local islanding detection methods may be classified as active and passive methods. Passive methods do not perturb the system but they have larger nondetection zones, whereas active methods have smaller nondetection zones but they perturb the system. In this paper, a new hybrid method is proposed to solve this problem. An over/undervoltage (passive method) has been used to initiate an undervoltage shift (active method), which changes the undervoltage shift of inverter, when the passive method cannot have a clear discrimination between islanding and other events in the system. Simulation results on MATLAB/SIMULINK show that over/undervoltage and undervoltage shifts of hybrid islanding detection method are very effective because they can determine anti-islanding condition very fast. % could determine anti-islanding condition within 0.04 s; % could determine anti-islanding condition within 0.04 s; % could determine anti-islanding condition within 0.08 s. This method perturbed the system, only in the case of % at which the control system of inverter injected a signal of undervoltage shift as necessary to check if the occurrence condition was an islanding condition or not.