Considerations on the Performance of Multi-point Synchronized Harmonic Measurement System

Babaev, Stanislav; Singh, Ravi Shankar; Cobben, J.F.G.; Ćuk, V.; Brom, Helko E. van den

doi:10.1109/amps.2018.8494894

Cited by 2 publications

(3 citation statements)

References 5 publications

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“…It is evident from (1) that, for correct calculation of the line harmonic voltage drop and subsequently estimation of the impedance, all the values must be recorded synchronously. Some considerations on this problem were reported in [11].…”

Section: Fundamental Ideamentioning

confidence: 99%

Online Estimation of Cable Harmonic Impedance in Low-Voltage Distribution Systems

Babaev¹,

Cobben²,

Ćuk³

et al. 2020

IEEE Trans. Instrum. Meas.

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Incorrect values of cable harmonic impedance can lead to wrong conclusions when assessing an impact of current distortion on the power network. A theoretical derivation of resistance and reactance for harmonic frequencies is not sufficient as it neglects operating conditions of cables as well as their configuration and actual installation pattern. In this paper, a noninvasive procedure for estimating parameters of the low-voltage cable is proposed. On contrary to invasive methods, the proposed technique does not require any external sources of harmonic excitation, and consequently, it does not introduce additional disturbances to the system. A disconnection of the cable is not required as the procedure meant to be performed online. The methodology employs natural variations of harmonic currents and voltages; however, the impedance angle is preserved due to the utilization of synchronized measurement samples. The developed signal processing algorithm provides noise reduction capabilities and smoothing of the output in presence of fluctuating harmonics. In addition, an attention is given to the metrological characterization of the measurement system and evaluation of uncertainty of impedance values. The results of the laboratory experiment indicate that for selective harmonics the variations of impedance estimates are no more than 10 m , which is in the range of calculated uncertainty values. The practical applicability of the method is discussed together with its limitations.

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Section: Fundamental Ideamentioning

confidence: 99%

Online Estimation of Cable Harmonic Impedance in Low-Voltage Distribution Systems

Babaev¹,

Cobben²,

Ćuk³

et al. 2020

IEEE Trans. Instrum. Meas.

Self Cite

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show abstract

“…On the other hand, as authors of [4] have shown in their laboratory experiment, much stricter time synchronization requirement of not worse than ±1 µs has to be imposed when a fundamental goal is to process harmonic spectral components.…”

Section: Introductionmentioning

confidence: 99%

“…It is worth noting that PQ measurement techniques based on synchronized sampling are currently being developed not only for distortion-related issues but also for other PQ events, for instance dips, swells, and interruptions. An example of such a study was presented in [10] with a focus on offshore wind farms [4].…”

Section: Introductionmentioning

confidence: 99%

Multi-Point Time-Synchronized Waveform Recording for the Analysis of Wide-Area Harmonic Propagation

et al. 2020

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This paper focuses on studying the phenomenon of harmonic distortion propagation through distribution networks. This phenomenon is governed by a combination of factors involving the nature of harmonic loads and their dynamic interaction, the influence of background voltage distortion, and harmonic impedance values. The objective of the proposed research includes evaluation of the network response at different nodes to harmonic current injections via utilizing a time-synchronized distributed measurement system. The study is performed in a fully controlled and flexible test network with three medium voltage/low voltage (MV/LV) distribution substations and several managed LV harmonic sources, namely PV inverter, single-phase EV charger and emulated harmonic load with reference current injections. A selection of the results is analyzed and interpretation of the observed phenomena is given with implications that synchronized harmonic measurements can be considered as potential powerful instruments for analyzing power quality disturbances.

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Considerations on the Performance of Multi-point Synchronized Harmonic Measurement System

Cited by 2 publications

References 5 publications

Online Estimation of Cable Harmonic Impedance in Low-Voltage Distribution Systems

Online Estimation of Cable Harmonic Impedance in Low-Voltage Distribution Systems

Multi-Point Time-Synchronized Waveform Recording for the Analysis of Wide-Area Harmonic Propagation

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