Microgrid Protection Strategy Based on the Autocorrelation of Current Envelopes Using the Squaring and Low-Pass Filtering Method

Shazia Baloch, Saeed Zaman Jamali, Khawaja Khalid Mehmood, Syed Basit Ali Bukhari, Muhammad Saeed Uz Zaman, Arif Hussain and Chul-Hwan Kim
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Shazia Baloch: Department of Electrical and Computer Engineering, Sungkyunkwan University, Suwon 16419, Korea
Saeed Zaman Jamali: Electrical Engineering Department, Balochistan University of Engineering and Technology, Khuzdar 89100, Pakistan
Khawaja Khalid Mehmood: U.S.-Pakistan Center for Advanced Studies in Energy, National University of Sciences and Technology, Islamabad 44100, Pakistan
Syed Basit Ali Bukhari: U.S.-Pakistan Center for Advanced Studies in Energy, National University of Sciences and Technology, Islamabad 44100, Pakistan
Muhammad Saeed Uz Zaman: Department of Electrical and Computer Engineering, Sungkyunkwan University, Suwon 16419, Korea
Arif Hussain: Department of Electrical and Computer Engineering, Sungkyunkwan University, Suwon 16419, Korea
Chul-Hwan Kim: Department of Electrical and Computer Engineering, Sungkyunkwan University, Suwon 16419, Korea

Energies, 2020, vol. 13, issue 9, 1-13

Abstract: To resolve the protection issues caused by high penetration of distributed energy resources, this paper proposes an efficient protection scheme for microgrids based on the autocorrelation of three-phase current envelopes. The proposed strategy uses a squaring and low-pass filtering approach for evaluating the envelope of the current signal. Then, the variance of the autocorrelation function is used to extract the hidden information of the distorted envelope to detect the fault signatures in the microgrid. Furthermore, the reactive power is used for determining the fault direction. The performance of the proposed protection scheme was verified on a standard medium-voltage microgrid by performing simulations in the MATLAB/Simulink environment (Version: R2017b). The proposed scheme was shown to be easy to implement and have good performance under looped and radial configuration for both grid-connected and islanded operation modes. The simulation results showed that the scheme could not only detect, locate, classify, and isolate various types of short-circuit faults effectively but also provide backup protection in case of primary protection failure.

Keywords: autocorrelation function; backup protection; envelope detection; reactive power; squaring and low-pass filtering (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (4)

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