NDLI: Adaptive CWT-based overcurrent protection for smart distribution grids considering CT saturation and high-impedance fault

Content Provider	IET Digital Library
Author	Govar, Saeed Asghari Heidari, Saeid Seyedi, Heresh Ghasemzadeh, Saeid Pourghasem, Pouya
Abstract	In this study, an adaptive continuous wavelet transform (CWT)-based overcurrent protection for smart grids is proposed to enhance the overcurrent protection performance encountering high-impedance fault (HIF) and current transformer (CT) saturation, which are extremely complex phenomena and their impacts often cause mis-coordination or mal-operation. The proposed algorithm samples three phase current waveforms and imports them to CWT to extract high frequency coefficients. Afterwards, the sum of absolute values of the coefficients, S coef, is calculated for each sample during the last cycle. Meanwhile, several simulations related to HIFs with different impedances and CT saturations with different severities are executed and the fault currents and the sum of absolute values of the coefficients are achieved and saved in the relay memory as (X, Y) coordinates of points (IL- fault, SL- coef), named ‘learning data’. Thereafter, each S coef is imported to the X−Y plane and, consequently, the occurrence of HIF or CT saturation is detected and the real-fault current is estimated by both non-linear interpolation and extreme learning machine approaches. Subsequently, new time dial setting and I pickup of the relays are computed and reloaded. Security, dependability, and sensitivity of the proposed adaptive protection method are confirmed by numerous simulation studies.
Starting Page	1366
Ending Page	1373
Page Count	8
ISSN	17518687
Volume Number	12
e-ISSN	17518695
Issue Number	Issue 6, Mar (2018)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-gtd/12/6
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-gtd.2017.0887
Journal	IET Generation, Transmission & Distribution
Publisher Date	2017-10-30
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Adaptive Continuous Wavelet Transform Adaptive CWT-based Overcurrent Protection Adaptive Protection Method CT Saturation Current Transformer Saturation Current Transformers Distribution Network Extreme Learning Machine Approach Frequency Coefficient HIF Occurrence High-impedance Fault Integral Transforms in Numerical Analysis Interpolation Interpolation And Function Approximation Knowledge Engineering Technique Learning Data Learning in AI Nonlinear Interpolation Numerical Analysis Overcurrent Protection Power Distribution Fault Power Distribution Protection Power Distribution Reliability Power Engineering Computing Power System Protection Real-fault Current Relay Memory Reliability Smart Distribution Grid Smart Power Grid Three-phase Current Waveform Time Dial Setting Transformer And Reactors Wavelet Transform
Content Type	Text
Resource Type	Article
Subject	Control and Systems Engineering Energy Engineering and Power Technology Electrical and Electronic Engineering

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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