A Comparative Study of Various Methods of Phasor Measurement Unit Algorithms

Talukder, Zahidur; Tasnim, Kazi Nishat; Reza, Md. Shamim

doi:10.1109/icasert.2019.8934584

Cited by 3 publications

(4 citation statements)

References 15 publications

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“…The following equations provide the definition of the synchrophas as described in the IEEE Std C37.118.1-2011 [4]. The sinusoidal waveform, derived fro the voltage or the current of the power network, is presented in Equation (1), while it is common practice to represent them in phasor form, as depicted in Equation (2), where th correlation of the phasor with the original signal is shown in Equation (3). The purpose of this paper is to present and discuss the progress of recent research and different approaches considering the development and implementation of PLL-based PMU algorithms for synchrophasor estimation.…”

Section: Synchrophasor Conceptsmentioning

confidence: 99%

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Implementation of Phasor Measurement Unit Based on Phase-Locked Loop Techniques: A Comprehensive Review

Giotopoulos,

Korres

2023

Energies

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The dynamic monitoring, control, and protection of modern power systems in real time require time-stamped electrical measurements to accurately estimate the bus voltage phasors using the state estimation function under normal and abnormal conditions. These measurements can be acquired by time-synchronized devices, known as phasor measurement units (PMUs). PMUs can measure bus voltage and branch current phasors of a three-phase network, as well as the frequency and the rate of change of frequency (ROCOF), with high speed, accuracy and time stamping provided by global positioning system (GPS) at the coordinated universal time (UTC). Various phasor estimation algorithms have been proposed in the literature, while most of them are concentrated in the discrete Fourier transform (DFT) algorithm, where an integer number of samples multiple of the nominal frequency is required for the computations. In cases where the frequency of the power grid deviates from its nominal value, the raw application of the DFT approach can lead to large errors during phasor estimation. Another approach of the phasor estimation is based on the phase-locked loop (PLL) techniques, widely used in grid tie inverters. PLL techniques can track dynamically (continuous time) the estimated frequency to the time-variant frequency of the power grid. A brief introduction to the basic concepts of the synchrophasor definition is provided, while the main DFT methods for synchrophasor estimation according to recent literature are mentioned. PLL-based PMU techniques are reviewed for both steady-state and dynamic conditions according to IEEE standards. In conclusion, the performance of PLL-based PMU algorithms presented in this literature review is discussed.

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Section: Synchrophasor Conceptsmentioning

confidence: 99%

“…So far, the majority of phasor estimation techniques that have been presented in literature can be divided into two main categories: (1) DFT-based and (2) non-DFT-based methods [1][2][3]. The former is used in the IEEE standard [4][5][6][7] due to its easy implementation and high robustness to the presence of harmonics [8].…”

Section: Introductionmentioning

confidence: 99%

Implementation of Phasor Measurement Unit Based on Phase-Locked Loop Techniques: A Comprehensive Review

Giotopoulos,

Korres

2023

Energies

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“…Considering the definitions made in (8), in which each parameter is defined as a nominal value (indicated by the subscript n) plus a small perturbation (indicated by Δ), (5) can be linearized as shown in (9) at the bottom of this page…”

Section: A Ltp Modelingmentioning

confidence: 99%

“…focused on applying the EPLL and its extended versions to different signal processing applications. For instance, in addition to the synchronization of power converters in both single-phase and three-phase applications, the EPLL and its extended versions have been widely employed for the detection and separation of fundamental and disturbance (dc, harmonics, and interharmonic) components of power signals [4], [5], computation of synchrophasors [6]- [8], fault analysis [9], estimation of parameters of electromagnetic oscillations [10], and implementations of robust resonant controllers [11], among other applications.…”

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confidence: 99%

More-Stable EPLL

Golestan

Matas

Abusorrah

et al. 2022

IEEE Trans. Power Electron.

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The enhanced phase-locked loop (EPLL) is one of the most famous PLLs in single-phase applications and a versatile tool for different signal processing applications, especially for the grid synchronization of power converters. Recently, it has been proved that the EPLL has a quite narrow stable zone (compared to its unstable zone) in the positive parameter space from a small-signal point of view. This zone will be even more narrow if maintaining a minimum stability margin is required. This article aims to modify the EPLL structure to improve its stability margin, and at the same time, make it unconditionally stable in the positive parameter space from a small-signal point of view.

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