An Analytical Fast Decaying DC Mitigation Method for Digital Relaying Applications

Hajizadeh, Hamid; Ahmadi, Seyed‐Alireza; Sanaye‐Pasand, M.

doi:10.1109/tpwrd.2020.3044376

Cited by 20 publications

(22 citation statements)

References 23 publications

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“…The trapezoid rule is used to estimate the DDC parameters in [3]. Two consecutive half cycles of a periodic signal are equal but with opposite signs.…”

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

confidence: 99%

“…This method needs a half-cycle plus three samples and is only valid in full-cycle DFT (FCDFT) applications. Figure 12 shows the comparative simulation results for the method in [3,18]. It is clear that noise sensitivity was very high in both methods since a small number of samples were considered for the DDC parameter estimation.…”

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 PT method [9] uses an average filter over the fundamental phasor, which removes the oscillating part from the Park quantities. However, it cannot attenuate the oscillating signal effectively since the signal overshoot is more than 15% in severe cases [3]. Moreover, in case of asymmetrical faults, a twice nominal frequency signal appears in the dq0 quantities.…”

Section: Critical Review Of Pre-dft Methodsmentioning

confidence: 99%

“…DDC is the result of a sudden change of the current in an inductive circuit, which depends on the X/R ratio of the system, fault location, and fault impedance [1]. DDC may last for 0.5 to 5 cycles [2] and cause current overshoots up to 15% [3]. Phasor estimation methods are designed to calculate phasor quantities based on sinusoidal signals.…”

Section: Introduction 1background and Motivationmentioning

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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“…The trapezoid rule is used to estimate the DDC parameters in [3]. Two consecutive half cycles of a periodic signal are equal but with opposite signs.…”

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

confidence: 99%

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%

Section: Introduction 1background and Motivationmentioning

confidence: 99%

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

et al. 2022

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Distance Protection

Sanaye‐Pasand¹,

Ahmadi²

2022

Wiley Encyclopedia of Electrical and Electronics Engineering

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With the increasing demand for electricity and expansion of power networks, transferring large capacities of electrical energy over long‐distance transmission lines became necessary. Since these lines pass through different geographical environments, they are exposed to a variety of hazards. Among them, electrical faults are the most common ones that can disturb network performance and cause system outages. If these faults are detected in the early stages and the faulty part is rapidly separated from the entire network, further damages to the network will be prevented. Distance protection is the main protection principle for transmission lines and interconnected sub‐transmission networks. In addition, it can be used as the backup protection for the adjacent lines, busbars, and transformers. Since this protection proves its reliable performance, it has been used for many years in the industry. As the hardware technology progressed from original electromechanical to static and now up to digital microprocessor‐based types, the implemented algorithms were also improved. In modern distance protection devices, in addition to fault detection, there are other functions for phase selection, fault location, power swing detection, communication schemes, and so on. In this chapter, an overview of this protection algorithm is presented, and its different aspects are investigated.

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Accurate Estimation of Amplitude, Phase, and Frequency of a Sinusoidal Signal Contaminated with Harmonics and DC Decaying Components

Kumar,

Tripathy

2024

Lecture Notes in Electrical Engineering

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An Analytical Fast Decaying DC Mitigation Method for Digital Relaying Applications

Cited by 20 publications

References 23 publications

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

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

Distance Protection

Accurate Estimation of Amplitude, Phase, and Frequency of a Sinusoidal Signal Contaminated with Harmonics and DC Decaying Components

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