access icon free Ensemble empirical mode decomposition-based differential protection scheme for islanded and grid-tied AC microgrid

© The Institution of Engineering and Technology
Received 08/06/2020, Accepted 15/12/2020, Revised 17/11/2020, Published 06/01/2021

This study presents a differential protection scheme based on ensemble empirical mode decomposition (EEMD) for AC microgrid. The fault current level is significantly lower during the islanded operation of a microgrid, which leads to the malfunction of the traditional over-current protection scheme. The proposed differential protection scheme uses the spectral differential energy of the first intrinsic mode function extracted from the decomposition of the current signal using EEMD for effective fault detection in the AC microgrid. The proposed EEMD-based differential protection scheme is validated on 10 bus and modified IEEE 34-bus AC microgrid test systems during various shunt faults. Moreover, the performance of the proposed EEMD-based differential protection scheme is evaluated under high fault impedance scenarios. The simulation results reveal that the proposed differential protection scheme can effectively detect the faulty line in an AC microgrid during seamless islanded and grid-tied operations.

Inspec keywords: power distribution lines; power distribution protection; power distribution faults; power generation protection; overcurrent protection; distributed power generation; Hilbert transforms; electric impedance; power grids; fault diagnosis; signal processing; fault currents

Other keywords: grid-tied AC microgrid; fault current level; line faults; current signal decomposition; modified IEEE 34-bus AC microgrid test systems; shunt faults; fault impedance scenarios; islanded operation; spectral differential energy; EEMD; differential protection scheme; first intrinsic mode function; over-current protection scheme; 10-bus AC microgrid test systems; fault detection; ensemble empirical mode decomposition

Subjects: Signal processing and detection; Distribution networks; Power system protection; Integral transforms; Distributed power generation

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