Adeyemi Charles Adewole

Distribution network fault section identification and fault location using wavelet entropy and neural networks

Display Omitted This paper proposes a new 2-stage hybrid method for distribution network fault section identification and fault location.Level-5 detail coefficients obtained from wavelet decomposition are used in computing the proposed wavelet-based indices.Artificial neural network models are developed using the proposed wavelet transform-based indices as inputs.A performance analysis of the developed models trained using the proposed indices is presented. Fault location in power system distribution networks is especially difficult because of the existence of several laterals/tap-offs in distribution networks. This implies that the calculated fault point can be wrongly estimated to be in any of the laterals. This paper proposes a new hybrid method combining Discrete Wavelet Transform (DWT) and artificial neural network (ANN) for fault section identification (FSI) and fault location (FL) in power system distribution networks. DWT was used in the analysis and extraction of the characteristic features from fault transient signals of the three phase line current measurements obtained at a single substation relaying point, rather than the double-ended approach used in the existing literature. Entropy Per Unit (EPU) indices are afterwards computed from the DWT decomposition, and are used as input to multi-layer ANN models serving as FSI classifiers and FL predictors respectively. The proposed hybrid method is tested using a benchmark IEEE 34-node test feeder. Comparisons, verification, and analysis made using the experimental results obtained from the application of the method showed very good performance for different fault types, fault locations, fault inception angles, and fault resistances. The proposed hybrid method is unique because of the pre-processing stage done with the DWT-EPU indices, the use of only line current measurements from a single relaying point, and the division of the FSI and FL tasks into sub-problems with respective ANN models.

Impact of IEC 61850-9-2 Standard-Based Process Bus on the Operating Performance of Protection IEDS: Comparative Study

Proceedings of the 19th World Congress The International Federation of Automatic Control Cape Town, South Africa. August 24-29, 2014

Protection of Distribution Systems Integrated with Distributed Generation

The integration of Distributed Generation (DG) in electric power systems has brought about the need for the improvement of the existing protective relaying principles used in distribution systems. This is because the integration of DG transforms the conventional single-source radial distribution system to a bidirectional multisource distribution system. Therefore, it is necessary to analyse the new short circuit fault current level, the general requirements for the integration of DG units, the requirement under abnormal conditions, power quality requirements, and the protection requirements. This chapter presents the impact of DG units on the short circuit current level and protective relaying in distribution systems. An overview of protection in conventional distribution system is first described. Afterwards, the impact of DG on the short circuit fault current and the protection of a distribution system integrated with DG are presented. Also, case studies and simulation examples on protective relaying in a distribution system integrated with DG are presented. Furthermore, some emerging technologies that can be applied to improve the protective relaying schemes in a DG-integrated distribution system are highlighted.