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

Stanislav Babaev,Sjef Cobben,Allan Downie,V Ćuk ,Ravi Shankar Singh

doi:10.3390/app10113869

Stanislav Babaev, Sjef Cobben + Show 3 more

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https://doi.org/10.3390/app10113869

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Abstract

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.

Highlights

Harmonic emission evaluation has been known as complex problem for many decades.Fluctuating nature of harmonics, high level of diversity and additional implications which appear with interconnection of Renewable Generation (RG) require improvement of the existing assessment and measurement methods
The results of the research project focused on the study of the phenomenon of harmonic distortion propagation through distribution networks were presented
The harmonic impact of PV inverter, EV charger and emulated injection source was the focus of this study

Summary

Introduction

Harmonic emission evaluation has been known as complex problem for many decades.Fluctuating nature of harmonics, high level of diversity and additional implications which appear with interconnection of Renewable Generation (RG) require improvement of the existing assessment and measurement methods. Given the dynamic nature of the mentioned processes an appropriate solution for investigation of harmonic propagation in specific parts of the power grid would be the application of multi-point distributed measurement system synchronized to a precision clock with high accuracy Despite the dynamic nature of PV power, it is to observe that harmonic voltage emissions phasors at 350 Hz are localized at the 1st quadrant of unity pane. Given the phasors of voltage background distortion located at the 4th quadrant, the conclusions that a small harmonic cancellation took place within this specific substation can be made.

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