A novel analytical method for DC offset mitigation enhancing DFT phasor estimation

Mohammadi, Sina; Rezaei, Navid; Mahmoudi, Amin

doi:10.1016/j.epsr.2022.108036

Cited by 3 publications

(5 citation statements)

References 19 publications

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“…where ∆ is approximately equal to one as verified in [21]. Thus, DDC is estimated through Equation (26).…”

Section: A Brief Survey On the Ddc Mitigation In Pre-dft Methodsmentioning

confidence: 93%

“…One data cycle was required for all calculations. A second-order derivative was used to remove the DDC effect before DFT in [21]. The main idea is that the summation of FC and its second derivative for the fundamental frequency component could be used to delete sinusoidal parts of the main signal.…”

Section: A Brief Survey On the Ddc Mitigation In Pre-dft Methodsmentioning

confidence: 99%

“…In this section, a critical review of the different pre-DFT methods and some of the main drawbacks are presented. x x x NA [11] x x x 1 cycle [12] x x 1 cycle +1 sample [14] x x 1 cycle [13] x x 1 cycle [15] x x 1 cycle [16] x 1 cycle +2 samples [1] 1 cycle [17] x 1 cycle +3 samples [6] x 1 cycle [18] x x 4 samples [3] 1/2 cycle +3 samples [19] half cycle + 2 samples [20] 1 cycle [21] half cycle + 1 sample…”

Section: Critical Review Of Pre-dft Methodsmentioning

confidence: 99%

“…The salient advantages of the method found in [21] include the low number of FC sample requirements for DDC elimination, as well as simplicity, and the two damping filters included for harmonics/noise rejection, which impose delays to overall computations.…”

Section: Critical Review Of Pre-dft Methodsmentioning

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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“…where ∆ is approximately equal to one as verified in [21]. Thus, DDC is estimated through Equation (26).…”

Section: A Brief Survey On the Ddc Mitigation In Pre-dft Methodsmentioning

confidence: 93%

Section: A Brief Survey On the Ddc Mitigation In Pre-dft Methodsmentioning

confidence: 99%

Section: Critical Review Of Pre-dft Methodsmentioning

confidence: 99%

Section: Critical Review Of Pre-dft Methodsmentioning

confidence: 99%

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

et al. 2022

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“…A multiple DDCO (MDDCO) algorithm has been studied using the derivative method and the Taylor series [23]. Assuming that the time constant lies between 0.5 and 5 cycles, the approximation of 1/ τ 2 ω 2 becomes zero.…”

Section: Introductionmentioning

confidence: 99%

A Novel Method for Removal of Dual Decaying DC Offsets to Enhance Discrete Fourier Transform-Based Phasor Estimation

Sok,

Kim,

Lak

et al. 2024

Energies

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This paper presents a novel method for the removal of dual decaying DC offsets (DDCOs) to enhance discrete Fourier transform-based phasor estimation. The method proposed in this paper uses the sum of even samples and the sum of odd samples from the input signal to remove the AC components, thereby precisely estimating the primary and secondary DDCOs. The fluctuations induced by DCCOs present in the output of traditional DFT methods are eliminated by using the estimated DCCOs. The performance of the method was evaluated in terms of both mathematical-generated signals and fault current signals from a 154 kV Korean overhead transmission system. PSCAD/EMTDC was used to generate fault current signals at various fault distances and angles. The results show that the proposed method can estimate the phasor of the fundamental frequency component accurately regardless of the primary and secondary DCCOs. The paper concludes by describing the hardware implementation in a prototype unit that considers the real-world requirements of power system protection.

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A continuous time model for observer-based frequency tracking

Pasand,

Ahmadi

2023

Results in Control and Optimization

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A novel analytical method for DC offset mitigation enhancing DFT phasor estimation

Cited by 3 publications

References 19 publications

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

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

A Novel Method for Removal of Dual Decaying DC Offsets to Enhance Discrete Fourier Transform-Based Phasor Estimation

A continuous time model for observer-based frequency tracking

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