Supraharmonic Interactions between Multiple Devices within Different Local Low Voltage Grid Structures

Waniek, Christian; Wohlfahrt, Thomas; Myrzik, J.M.A.; Meyer, Jan; Schegner, Peter

doi:10.24084/repqj16.297

Cited by 4 publications

(3 citation statements)

References 4 publications

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“…HFD from sources connected to the MV network, such as PV installation, wind farms, EV charger stations, and all renewable sources that use switching power converters, will spread through the MV network and, from there, through the transfer impedance to equipment connected to the LV grid. Furthermore, LV devices, such as LED lamps, can produce HFD and, from there, can be transferred to MV grids [58,59]. Therefore, the equipment connected to both the LV and MV grids can be interfered with or damaged by the propagation of HFDs.…”

Section: Propagation Of Hfds: Grid Impedance Measurementmentioning

confidence: 99%

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Power Grids and Instrument Transformers up to 150 kHz: A Review of Literature and Standards

Agazar,

D’Avanzo,

Frigo

et al. 2024

Sensors

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The phenomenon of high-frequency distortion (HFD) in the electric grids, at both low-voltage (LV) and medium-voltage (MV) levels, is gaining increasing interest within the scientific and technical community due to its growing occurrence and the associated impact. These disturbances are mainly injected into the grid by new installed devices, essential for achieving decentralized generation based on renewable sources. In fact, these generation systems are connected to the grid through power converters, whose switching frequencies are significantly increasing, leading to a corresponding rise in the frequency of the injected disturbances. HFD represents a quite recent issue, but numerous scientific papers have been published in recent years on this topic. Furthermore, various international standards have also covered it, to provide guidance on instrumentation and related algorithms and indices for the measurement of these phenomena. When measuring HFD in MV grids, it is necessary to use instrument transformers (ITs) to scale voltages and currents to levels fitting with the input stages of power quality (PQ) instruments. In this respect, the recently released Edition 2 of the IEC 61869-1 standard extends the concept of the IT accuracy class up to 500 kHz; however, the IEC 61869 standard family provides guidelines on how to test ITs only at power frequency. This paper provides an extensive review of literature, standards, and the main outputs of European research projects focusing on HFD and ITs. This preliminary study of the state-of-the-art represents an essential starting point for defining significant waveforms to test ITs and, more generally, to achieve a comprehensive understanding of HFD. In this framework, this paper provides a summary of the most common ranges of amplitude and frequency variations of actual HFD found in real grids, the currently adopted measurement methods, and the normative open challenges to be addressed.

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Section: Propagation Of Hfds: Grid Impedance Measurementmentioning

confidence: 99%

“…Advanced methods for characterizing LV grid access impedance in the frequency range assigned to Narrow-band power-line communications (NB-PLC) have been developed and validated [58].…”

mentioning

confidence: 99%

Power Grids and Instrument Transformers up to 150 kHz: A Review of Literature and Standards

Agazar,

D’Avanzo,

Frigo

et al. 2024

Sensors

View full text Add to dashboard Cite

show abstract

“…Nearly all contemporary home appliances have sources for mechanical oscillations, such as capacitors, coils, or transformers, and tests show that a large number of appliances create noise due to SH. A detailed description of the SH interaction between a number of devices and a low voltage grid in a representative setup is provided [10]. The flow of the currents between the grid and the devices, interactions between various devices and various grid impedances, and the ensuing effects on emission amplitude are studied.…”

Section: Introductionmentioning

confidence: 99%

Comparative harmonic elimination techniques for supraharmonic reduction in microgrid

Siva,

Ramesh Kumar,

Dhayalini

2024

Bulletin EEI

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In order to reduce voltage distortion and supraharmonic (SH) emission in microgrid (MG) systems with electric vehicle (EV) charging stations, this research compares several harmonic elimination approaches. The increasing deployment of EVs has led to the integration of EV charging stations within MG systems, presents challenges in maintaining a high power quality (PQ). Voltage distortions and SH emissions are caused due to non-linear loads and the intermittent nature of EV charging, which have an effect on the performance and dependability of the MG. In order to solve these problems, multilevel converters (MLCs) are used to produce high-quality waveforms. MLCs use harmonic elimination methods to cut down on SH emissions, which improves the PQ overall. Sinusoidal pulse width modulation (PWM), selective harmonic elimination (SHE), space vector modulation (SVM), and random-PWM (RPWM) techniques are among the harmonic elimination methods compared and analyzed. The results will enable the selection of the most appropriate strategy for minimizing voltage distortion and SH emission in MG systems, while providing valuable insights into the effectiveness of each method.

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A Comprehensive Review on Supraharmonics—The Next Big Power Quality Concern

Rajkumar,

Balasubramanian,

Kathirvelu

2024

Smart Grids and Energy

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Supraharmonic Interactions between Multiple Devices within Different Local Low Voltage Grid Structures

Cited by 4 publications

References 4 publications

Power Grids and Instrument Transformers up to 150 kHz: A Review of Literature and Standards

Power Grids and Instrument Transformers up to 150 kHz: A Review of Literature and Standards

Comparative harmonic elimination techniques for supraharmonic reduction in microgrid

A Comprehensive Review on Supraharmonics—The Next Big Power Quality Concern

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