RESEARCH ARTICLE

Hybrid intelligent water drop bundled wavelet neural network to solve the islanding detection by inverter-based DG

  • Mehrdad TARAFDAR HAGH 1 ,
  • Homayoun EBRAHIMIAN 2 ,
  • Noradin GHADIMI , 2
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  • 1. Faculty of Electrical and Computer Engineering, University of Tabriz, Tabriz 0411, Iran
  • 2. Department of Electrical Engineering, Ardabil Branch, Islamic Azad University, Ardabil 045, Iran

Received date: 25 Nov 2013

Accepted date: 04 Feb 2014

Published date: 02 Mar 2015

Copyright

2014 Higher Education Press and Springer-Verlag Berlin Heidelberg

Abstract

In this paper, a passive neuro-wavelet based islanding detection technique for grid-connected inverter-based distributed generation was developed. The weight parameters of the neural network were optimized by intelligent water drop (IWD) to improve the capability of the proposed technique in the proposed problem. The proposed method utilizes and combines wavelet analysis and artificial neural network (ANN) to detect islanding. Connecting distributed generator to the distribution network has many benefits such as increasing the capacity of the grid and enhancing the power quality. However, it gives rise to many problems. This is mainly due to the fact that distribution networks are designed without any generation units at that level. Hence, integrating distributed generators into the existing distribution network is not problem-free. Unintentional islanding is one of the encountered problems. Discrete wavelet transform (DWT) is capable of decomposing the signals into different frequency bands. It can be utilized in extracting discriminative features from the acquired voltage signals. In passive schemes with a large non-detection zone (NDZ), concern has been raised on active method due to its degrading power quality effect. The main emphasis of the proposed scheme is to reduce the NDZ to as close as possible and to keep the output power quality unchanged. The simulation results from Matlab/Simulink shows that the proposed method has a small non-detection zone, and is capable of detecting islanding accurately within the minimum standard time.

Cite this article

Mehrdad TARAFDAR HAGH , Homayoun EBRAHIMIAN , Noradin GHADIMI . Hybrid intelligent water drop bundled wavelet neural network to solve the islanding detection by inverter-based DG[J]. Frontiers in Energy, 2015 , 9(1) : 75 -90 . DOI: 10.1007/s11708-014-0337-3

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