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Power Electronic and Harmonic
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Power Electronic and Harmonic

A special issue of Energies (ISSN 1996-1073). This special issue belongs to the section "F3: Power Electronics".

Deadline for manuscript submissions: closed (25 November 2021) | Viewed by 7470

Special Issue Editor

Dr. Boštjan Blažič

E-Mail Website
Guest Editor
Faculty of Electrical Engineering, University of Ljubljana, SI-1000 Ljubljana, Slovenia
Interests: active power filters; power quality; renewable energy; power distribution systems; smart grids; electric vehicles

Special Issue Information

Dear Colleagues,

In the last decade, we have seen a rising share of power-electronic (PE) devices connected to the grid. They are the results of the proliferation of renewable energy sources, controllable loads, FACTS devices, and HVDC links at transmission level and the electrification of transport and heating.

One of the major concerns related to the proliferation of PE-interfaced devices is the degradation of power quality, where harmonics are one of the main issues. PE devices generate harmonics, and the resulting harmonic distortion is the consequence of the interaction between the device and network impedance. In addition to a general increase of harmonic levels, impedance resonance conditions may cause large amplifications of harmonics, and the mis-operation of PE-device controllers at harmonic frequencies is also one of the problems we are seeing today.

In order to adequately improve harmonic distortion levels due to PE devices, we firstly need accurate measurements of harmonics (at different voltage levels), then methodologies for the calculation of responsibilities for harmonic distortion and the assessment of harmonics propagation through networks and, at the end, solutions for harmonics mitigation, including advanced PE devices, designed to be part of the solution.

Any scientific work dealing with the aforementioned topics regarding the sources, propagation, and mitigation of harmonics due to PE devices are welcome in this Special Issue.

Dr. Boštjan Blažič
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Energies is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • Power-electronic devices
  • Harmonic emissions from power-electronic devices
  • Harmonics measurements
  • Frequency-domain analysis
  • Frequency-dependent network-impedance characteristics
  • Network-impedance resonance conditions
  • Controllers instability at harmonic frequencies
  • Customer harmonic-contribution assessment methods
  • Harmonics mitigation
  • Power harmonic filters

Published Papers (3 papers)

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Research

18 pages, 9603 KiB  
Article
Identification of Even-Order Harmonics Injected by Semiconverter into the AC Grid
by Andrej Brandis, Denis Pelin, Zvonimir Klaić and Damir Šljivac
Energies 2022, 15(5), 1614; https://doi.org/10.3390/en15051614 - 22 Feb 2022
Viewed by 1967
Abstract
In this study, the feedback effects of a three-phase half-controlled rectifier (also known as a semiconverter) to three-phase AC power grid was analyzed. Special attention was paid to the identification of harmonic order of the phase current. As a reference point for analysis, [...] Read more.
In this study, the feedback effects of a three-phase half-controlled rectifier (also known as a semiconverter) to three-phase AC power grid was analyzed. Special attention was paid to the identification of harmonic order of the phase current. As a reference point for analysis, the mathematical model of an uncontrolled rectifier was used. The harmonic order of the phase current was identified by displaying the measurement results as well as using a mathematical model that is easily applicable, although this is unusual for harmonic analysis because it is based on time domain data. For this purpose, laboratory models of uncontrolled and half-controlled rectifiers were assembled. For both converters, the results obtained by practical laboratory measurements were compared to the mathematically obtained results, with the commutation in the mathematical model being ignored. The effects of commutation were analyzed in more detail for the laboratory model. For the semiconverter, the characteristic waveforms were studied for few different firing angles of the thyristor. Additionally, total power factor and total harmonic distortion of phase current were determined for all chosen firing angles. Finally, a comprehensive conclusion was drawn based on theoretically and practically obtained results on the appearance of even-order current harmonics, which should be taken into consideration when designing input filters and which contributes to power quality of the AC power grid. Full article
(This article belongs to the Special Issue Power Electronic and Harmonic)
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14 pages, 7846 KiB  
Article
Evaluation of Deep Learning-Based Neural Network Methods for Cloud Detection and Segmentation
by Stefan Hensel, Marin B. Marinov, Michael Koch and Dimitar Arnaudov
Energies 2021, 14(19), 6156; https://doi.org/10.3390/en14196156 - 27 Sep 2021
Cited by 5 | Viewed by 2169
Abstract
This paper presents a systematic approach for accurate short-time cloud coverage prediction based on a machine learning (ML) approach. Based on a newly built omnidirectional ground-based sky camera system, local training and evaluation data sets were created. These were used to train several [...] Read more.
This paper presents a systematic approach for accurate short-time cloud coverage prediction based on a machine learning (ML) approach. Based on a newly built omnidirectional ground-based sky camera system, local training and evaluation data sets were created. These were used to train several state-of-the-art deep neural networks for object detection and segmentation. For this purpose, the camera-generated a full hemispherical image every 30 min over two months in daylight conditions with a fish-eye lens. From this data set, a subset of images was selected for training and evaluation according to various criteria. Deep neural networks, based on the two-stage R-CNN architecture, were trained and compared with a U-net segmentation approach implemented by CloudSegNet. All chosen deep networks were then evaluated and compared according to the local situation. Full article
(This article belongs to the Special Issue Power Electronic and Harmonic)
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20 pages, 6590 KiB  
Article
Harmonic Resonance Identification and Mitigation in Power System Using Modal Analysis
by Jure Lokar, Janja Dolenc, Boštjan Blažič and Leopold Herman
Energies 2021, 14(13), 4017; https://doi.org/10.3390/en14134017 - 3 Jul 2021
Cited by 6 | Viewed by 2418
Abstract
Due to a rising share of power electronic devices in power networks and the consequent rise in harmonic distortion, impedance resonances are an important issue. Nowadays, the frequency scan method is used for resonance phenomena identification and analysis. The main disadvantage of the [...] Read more.
Due to a rising share of power electronic devices in power networks and the consequent rise in harmonic distortion, impedance resonances are an important issue. Nowadays, the frequency scan method is used for resonance phenomena identification and analysis. The main disadvantage of the method is its inability to decouple different resonance phenomena. This means that the method is also unable to provide sufficient information about the effects that the parameters of network elements have on different resonance phenomena. Furthermore, it was also noted that despite the fact that the harmonic resonance mode analysis is well described in the literature, there is a lack of systematic approach to the analysis procedure. Thus the main objective of this paper is to address this disadvantage and to propose a systematic approach to harmonic resonance analysis and mitigation, utilizing modal analysis. In the first part of the paper, dominant network nodes in terms of resonance amplification of harmonics are determined. This is done by analysis of the eigenvalues of the network admittance matrix. Using the eigenvalue analysis results, key parameters of network elements involved in a specific resonance are determined next. This is performed by calculating the critical mode (i.e., the mode that experiences resonance) sensitivity coefficients with respect to network parameters. In the second part of the paper, the procedure for modal resonance frequency shift is presented. The shift is performed by changing the value of a selected parameter so that the modal resonance frequency matches the desired resonance frequency value. The parameter value is calculated with the Newton–Rhapson method. Presented analysis considers both parallel and series resonances. The effectiveness of the proposed method is demonstrated on an actual industrial-network model. Full article
(This article belongs to the Special Issue Power Electronic and Harmonic)
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