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Power Quality in AC and DC Distribution Grids: Monitoring, Management and Improvement

A special issue of Energies (ISSN 1996-1073). This special issue belongs to the section "F: Electrical Engineering".

Deadline for manuscript submissions: closed (20 December 2023) | Viewed by 944

Special Issue Editors


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Guest Editor
Ricerca sul Sistema Energetico-RSE S.p.A., Via Rubattino 54, 20134 Milano, Italy
Interests: power quality; distribution systems;

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Guest Editor
Dipartimento di Elettronica, Informazione e Bioingegneria, Politecnico di Milano, Piazza Leonardo da Vinci 32, 20133 Milan, Italy
Interests: digital signal processing; power quality; harmonics; nonlinear models; measurement systems; electrical measurements; instrument transformers
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Special Issue Information

Dear Colleagues,

As Guest Editors, we are welcoming submissions to the Special Issue entitled “Power Quality in AC and DC Distribution Grids: Monitoring, Management and Improvement ".

Distribution systems (DSs) are expected to undergo deep changes in the future years. Most of them are driven by the efforts taken to reduce global warming through decarbonization of energy production and transition towards e-mobility. In this scenario, the presence of plug-in electric vehicle charging stations is likely to increase massively, such as the penetration of renewable energy sources (RES) connected to the DSs, generally combined with energy storage systems (ESS) that are necessary to make up for the non-programmable nature of some RES. As a result, the number of power electronics-based devices is expected to grow even faster, also boosted by the impressive ad advancement of semiconductor technology. From a different point of view, an attractive solution to effectively integrate RES and ESS into existing AC DSs is represented by DC microgrids.

The impact of these changes on the operation of the DSs is huge. Among them, the transmission grid is weakened, system inertia is significantly smaller, thus resulting in faster dynamics; the harmonic content of current and voltage waveforms in DSs could increase significantly because of the large number of both load and generators based on power electronics. In this scenario, power quality (PQ) has key importance: customers are becoming more demanding in terms of continuity and quality of the power supply, while harmonic pollution should be mitigated for increasing efficiency, reducing dielectric and thermal stresses, preventing the triggering of resonances. High PQ levels and advanced grid monitoring are among the prerogatives of the now ubiquitous Smart Grid paradigm.

PQ monitoring in conventional AC DSs is ruled by standard EN50160. On the other hand, the concept of PQ in DC systems is yet under investigation. In either the cases, extensive monitoring thanks to proper distributed measurements systems can play a key role for a proper handling these phenomena, which means evaluating the PQ level while studying possible improvements.

In conclusion, the aim of this special issue is attracting researchers active in the field of PQ evaluation and improvement, applied to both AC and DC DSs, in order to present their last advancements.

Dr. Michele Zanoni
Dr. Sergio Toscani
Guest Editors

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 quality
  • harmonic monitoring
  • location of harmonic sources
  • instrument transformers
  • voltage and current measurements
  • AC and DC distribution systems
  • monitoring systems

Published Papers (1 paper)

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Research

19 pages, 11327 KiB  
Article
New Reference Current Calculation Method of a Hybrid Power Filter Based on Customer Harmonic Emission
by Leopold Herman and Aljaž Špelko
Energies 2023, 16(23), 7876; https://doi.org/10.3390/en16237876 - 1 Dec 2023
Cited by 2 | Viewed by 692
Abstract
This paper presents a novel reference current calculation method for harmonics mitigation and reactive power compensation in power systems. This method was applied to a unique hybrid power filter topology. The motivation for this study comes from the increasing power quality issues, such [...] Read more.
This paper presents a novel reference current calculation method for harmonics mitigation and reactive power compensation in power systems. This method was applied to a unique hybrid power filter topology. The motivation for this study comes from the increasing power quality issues, such as harmonic distortion and resonances, caused by the widespread integration of converter-interfaced generation (CIG) and modern nonlinear loads into the power system in recent years. The goal of this study is to propose a cost-effective and practical solution for current harmonics filtering and power factor correction by combining the advantages of passive and active filters into a hybrid solution. The developed reference current calculation method, which is based on customer current harmonic emissions, enables effective reference current calculation. Theoretical analyses along with simulation results obtained from a medium-voltage benchmark model in PSCAD verify the effectiveness of the proposed solution in harmonics filtering and show a substantial reduction in filter current ratings across various harmonic components. In addition, the simulation results were evaluated by comparison with the results obtained from a real-time simulator. Full article
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