Enhancing Immunity of Full-Cycle Discrete Fourier Transform Against Decaying DC Components: a Comparative Analysis

Tajdinian, Mohsen; Samet, Haidar; Hamedi, Alireza; Hadaeghi, Arsalan; Bagheri, Alireza; Allahbakhshi, Mehdi; Seifi, Ali Reza

doi:10.1109/eeeic.2019.8783369

Cited by 2 publications

(3 citation statements)

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“…To the best of the authors' knowledge, only two conference papers have reviewed DDC mitigation methods [4,5]. In [4], only six methods were considered for evaluation and some limited statistical comparative results were given.…”

Section: Contributionsmentioning

confidence: 99%

“…In [4], only six methods were considered for evaluation and some limited statistical comparative results were given. In [5], the authors evaluated a group of methods through simulation results, proposing analytical solutions for both primary and auxiliary DDCs. Thus, the previous works in this field are limited and could not provide a clear point of view on DDC mitigation methods.…”

Section: Contributionsmentioning

confidence: 99%

“…Based on Equation (5), DFT in the presence of DDC has a certain amount of errors, which endanger protection systems. Figure 5 shows the amplitude of a typical FC signal in the presence of DDC.…”

Section: Dft Analysis In Current Phasor Estimationmentioning

confidence: 99%

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

et al. 2022

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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.

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Section: Contributionsmentioning

confidence: 99%

Section: Contributionsmentioning

confidence: 99%