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Power Electronics and Power Quality 2025

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

Deadline for manuscript submissions: 25 August 2025 | Viewed by 310

Special Issue Editor


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Guest Editor
Departamento de Electrónica Industrial, Universidade do Minho, Campus de Azurém, 4800-058 Guimarães, Portugal
Interests: power electronics; power quality; active power conditioners; renewable energy systems; electric vehicles; digital control of power electronics converters
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Special Issue Information

Dear Colleagues,

Nowadays, with distributed generation, the integration of intermittent renewable energy sources, the widespread use of electric vehicles and charging infrastructure, and the electrification of railways, a set of new challenges are arising for electric power systems, namely in terms of stability and power quality. Therefore, the research and development of solutions for monitoring and improving power quality is more important than ever. This Special Issue of Energies aims to collect and disseminate the latest advances in power electronics and power quality, namely in terms of power quality monitoring, active power conditioners for power quality improvement, power quality in smart grids and microgrids, energy storage systems with power quality ancillary services, electric vehicle battery chargers with smart operation modes, and the integration of renewable energy systems with power quality ancillary services.

Dr. José Gabriel Oliveira Pinto
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.

Dr. José Gabriel Oliveira Pinto
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 electronics
  • power quality
  • power quality monitoring
  • power quality improvement
  • power quality conditioners
  • control theories
  • smart grids
  • microgrids
  • energy storage systems
  • distributed generation
  • renewable energy systems
  • electric vehicles

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Published Papers (1 paper)

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Research

17 pages, 2556 KiB  
Article
Novel Hybrid Islanding Detection Technique Based on Digital Lock-In Amplifier
by Muhammad Noman Ashraf, Abdul Shakoor Akram and Woojin Choi
Energies 2025, 18(13), 3449; https://doi.org/10.3390/en18133449 - 30 Jun 2025
Viewed by 173
Abstract
Islanding detection remains a critical challenge for grid-connected distributed generation systems, as passive techniques suffer from inherent non-detection zones (NDZ), and active methods often degrade power quality. This paper introduces a hybrid detection strategy based on monitoring inherent grid harmonics via a Digital [...] Read more.
Islanding detection remains a critical challenge for grid-connected distributed generation systems, as passive techniques suffer from inherent non-detection zones (NDZ), and active methods often degrade power quality. This paper introduces a hybrid detection strategy based on monitoring inherent grid harmonics via a Digital Lock-In Amplifier. By comparing real-time 5th and 7th harmonic amplitudes against their three-cycle-delayed values, the passive stage adaptively identifies potential islanding without fixed thresholds. Upon detecting significant relative variation, a brief injection of a non-characteristic 10th harmonic (limited to under 3% distortion for three line cycles) serves as active verification, ensuring robust discrimination between islanding and normal disturbances. Case studies demonstrate detection within 140 ms—faster than typical reclosing delays and well below the 2 s limit of IEEE std. 1547—while preserving current zero-crossings and enabling grid impedance estimation. The method’s resilience to grid disturbances and stiffness is validated through PSIM simulations and laboratory experiments, meeting IEEE 1547 and UL 1741 requirements. Comparative analysis shows superior accuracy and minimal power-quality impact relative to existing passive, active, and intelligent approaches. Full article
(This article belongs to the Special Issue Power Electronics and Power Quality 2025)
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