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Ass. Lect. Mohamed Ibrahim Zaki Amer :: Publications:

Title:
A proposed fault identification-based fuzzy approach for active distribution networks with photovoltaic systems
Authors: Mohamed I. Zaki , Ragab A. El Sehiemy , Tamer F. Megahed , Tanemasa. Asano , Sobhy M. Abdelkader
Year: 2023
Keywords: Active distribution protection Fault-identification Renewable energy resources Fuzzy logic Cross-alienation concept
Journal: Measurement
Volume: Not Available
Issue: 223
Pages: 21
Publisher: Elsevier
Local/International: International
Paper Link:
Full paper Not Available
Supplementary materials Not Available
Abstract:

Recently, the issue of protection in active distribution networks has been greater than before due to the mushrooming use of photovoltaic (PV) generation units. PV systems coupled to power electronics devices and their control strategies causes significant changes to fault current characteristics, leading to maloperation of fault identification schemes. Therefore, this paper proposes a robust, self-adaptive fault identification scheme that incorporates the presence of PV systems and considers the effect of uncertainty arising due to their high penetration levels. The real-time voltage and current measurements are captured locally by advanced one-end measuring facilities, considering the uncertain temperature and irradiation conditions, of solar generation units. First, the proposed scheme employs wavelet transform, statistical alienation concepts, and fuzzy logic to identify the fault criteria. Then, it uses fuzzy concept-based system features to obtain optimal protection scheme setting. For simulation analysis, a 10 MW solar farm-connected to a real-world active distribution system is emulated in PSCAD-EMTDC simulator to create intensive study cases, and the proposed scheme is implemented in MATLAB software. Several fault parameters are examined in the scheme, comprising different fault types, fault locations, and transition resistances. Also, the uncertainty arising from PV plants and different loading conditions are taken full consideration in the developed scheme. Simulation results have verified the validity of fault identification scheme; nonetheless, the computational burden is kept reasonable. The proposed scheme is investigated under white gaussian and impulsive noise. Furthermore, sensitivity analysis and comparative study are conducted in terms of accuracy, high decision speed, and sampling frequency variation. The proposed scheme succeeds to detect and classify internal faults for both on- and off-grid operation modes and differentiate them from external ones in the case of on-grid mode. The proposed scheme has dominance performance, including high speed fault detection within a half cycle and provides accuracy greater than 98%.

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