Decaying DC Offset Current Mitigation in Phasor Estimation Applications: A Review

Sina Mohammadi, Amin Mahmoudi, Solmaz Kahourzade, Amirmehdi Yazdani and Shafiullah Gm
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Sina Mohammadi: Department of Electrical Engineering, University of Zanjan, Zanjan, Iran
Amin Mahmoudi: College of Science and Engineering, Flinders University, Adelaide, SA 5042, Australia
Solmaz Kahourzade: STEM, University of South Australia, Adelaide, SA 5095, Australia
Amirmehdi Yazdani: Discipline of Engineering and Energy, College of Science, Health, Engineering and Education, Murdoch University, Perth, WA 6150, Australia
Shafiullah Gm: Discipline of Engineering and Energy, College of Science, Health, Engineering and Education, Murdoch University, Perth, WA 6150, Australia

Energies, 2022, vol. 15, issue 14, 1-33

Abstract: Decaying DC (DDC) offset current mitigation is a vital challenge in phasor current estimation since it causes malfunctioning/maloperation of measurements and protection systems. Due to the inductive nature of electric power systems, the current during fault inception cannot change immediately and it contains a transient oscillation. The oscillatory component acts similar to an exponential DC signal and its characteristics depend on the X/R ratio of the system, fault location, and fault impedance. DDC attenuates accurate phasor estimation, which is pivotal in protection systems. Therefore, the DDC must be eliminated from the fault current (FC) signal. This paper presents an overview of DDC mitigation methods by considering different groups—before the discrete Fourier transform (pre-DFT), after the discrete Fourier transform (post-DFT), the least square-based (LS-based), and other methods. Through a comprehensive review of the existing schemes, the effects of noise, harmonics, multiple DDCs (MDDCs), and off-nominal frequency (ONF) on the accuracy of DDC estimation, were recognized. A detailed discussion (along with some simulation results) are presented to address the main advantages/disadvantages of the past studies. Finally, this paper presents a few suggestions for future researchers, for researchers to investigate more implementable solutions in this field.

Keywords: DC offset current; DFT; harmonics; least-squares (LS) method; noise; off-nominal frequency; phasor estimation (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: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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