Comparison of Measurement Methods of Grid Impedance for Narrow Band-PLC up to 500 kHz

Capponi, Lino; Fernández, Igor; Roggo, Dominique; Arrinda, Amaia; Angulo, Itziar; Vega, David

doi:10.1109/amps.2018.8494853

Cited by 15 publications

(14 citation statements)

References 6 publications

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“…Method I was developed by the Institute Systems Engineering at HES-SO Valais-Wallis [49,50]. In the design of the so-called IGOR-Meter, particular attention was put on flexibility, high accuracy, a wide frequency range, portability and low impact on other equipment connected to the grid.…”

Section: Methods I: Igor-metermentioning

confidence: 99%

“…The method developed by the University of the Basque Country (UPV/EHU) is based on the measurement of the voltage and current values of ad-hoc test signals injected in the grid [50,53]. The test signals are injected in a controlled way into the grid, with a limited amplitude, in order to avoid damage on other devices connected to the grid.…”

Section: Fundamentals Of the Methodsmentioning

confidence: 99%

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Comparison of Measurement Methods of LV Grid Access Impedance in the Frequency Range Assigned to Nb‑Plc Technologies

et al. 2019

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The paper presents and evaluates three advanced methods for the characterization of the low-voltage (LV) grid access impedance for the frequency range assigned to Narrow Band-Power Line Communications (NB-PLC): 9 kHz to 500 kHz. This study responds to the recent demand from both regulatory bodies and Distribution System Operators about the need for accurate and validated methods for this frequency band, due to the limited knowledge of the impedance values in the electrical grid and their influence on NB-PLC transmission channels. In this paper, the results of a collaborative work to develop different proposals to overcome the challenges for the proper characterization of the frequency and time-varying grid impedance, from different theoretical approaches, are presented. The methods are compared in a controlled and isolated scenario: the impedance characterization of passive filters. Then, the results are validated two-fold: first, against theoretical simulations, based on the schematics provided by the manufacturer, and second, against the measurement results of a precision impedance meter, used as a reference of accuracy. The results demonstrate a high degree of precision of the three proposals to characterize the access impedance of the LV grid.

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Section: Methods I: Igor-metermentioning

confidence: 99%

Section: Fundamentals Of the Methodsmentioning

confidence: 99%

Comparison of Measurement Methods of LV Grid Access Impedance in the Frequency Range Assigned to Nb‑Plc Technologies

et al. 2019

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“…These filters show a wide range of impedance values along the PLC frequency band, mainly due to the resonance effects they cause at specific frequencies. The frequencydependent impedance of these filters, in terms of magnitude and phase, can be found in previous publications from the authors [17,18].…”

Section: Emc Filtersmentioning

confidence: 99%

Characterization of the Potential Effects of EMC Filters for Power Converters on Narrowband Power Line Communications

et al. 2021

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Electromagnetic Compatibility (EMC) filters are one of the main solutions for dealing with the disturbances generated by power inverters. However, they show series/parallel resonances that introduce variations in the impedance seen from the grid. Consequently, in some cases, these filters have low impedances at resonance frequencies, which can affect Narrowband Power Line Communications (NB-PLC) due to notching effects. For that reason, the potential effects of four EMC filters on NB-PLC have been studied. Laboratory trials in a controlled environment have been carried out, in which the attenuation and the Signal-to-Noise Ratio (SNR) thresholds that define the communication’s quality have been studied. The results presented in this paper show that, although the variations of the channel frequency response are not selective enough to degrade the communication thresholds, the attenuation measured when the filter is connected near the receiver might be sufficiently high to be critical for the communications in some situations. Therefore, EMC filters might have a negative impact on NB-PLC that had not been previously considered.

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“…7. Frequency sweeps are usually undertaken by attaching specialised hardware at the point of interest [52], injecting small steady state sinusoidal perturbations at a wide range of frequencies, and employing Fourier analysis to calculate the network impedance in the frequency domain, as per (18) where ω represents the perturbation frequency [5], [75]. Note that the perturbation frequency must be different to the fundamental frequency.…”

Section: ) Frequency Sweepsmentioning

confidence: 99%

“…The main priority in network characterisation is capture of wide frequency spectrum and temporal variations of the power network, in order to make power quality assessments and protection / filtering design decisions. This is covered in [8], [52], [75]- [77], [81], where the portability of the equipment is particularly important. Active techniques are required here, with the literature focused on frequency sweeps and impulse-response.…”

Section: ) Network Characterisationmentioning

confidence: 99%

Review of Local Network Impedance Estimation Techniques

et al. 2020

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Comparison of Measurement Methods of Grid Impedance for Narrow Band-PLC up to 500 kHz

Cited by 15 publications

References 6 publications

Comparison of Measurement Methods of LV Grid Access Impedance in the Frequency Range Assigned to Nb‑Plc Technologies

Comparison of Measurement Methods of LV Grid Access Impedance in the Frequency Range Assigned to Nb‑Plc Technologies

Characterization of the Potential Effects of EMC Filters for Power Converters on Narrowband Power Line Communications

Review of Local Network Impedance Estimation Techniques

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