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Power Electronics and Power Quality 2021
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Power Electronics and Power Quality 2021

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

Deadline for manuscript submissions: closed (31 December 2022) | Viewed by 13636

Special Issue Editor

Dr. José Gabriel Oliveira Pinto

E-Mail Website
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
Special Issues, Collections and Topics in MDPI journals

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.

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

Related Special Issues

Published Papers (4 papers)

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Research

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22 pages, 2628 KiB  
Article
d-q Small-Signal Model for Grid-Forming MMC and Its Application in Electromagnetic-Transient Simulations
by Cleiton M. Freitas, Edson H. Watanabe and Luís F. C. Monteiro
Energies 2023, 16(5), 2195; https://doi.org/10.3390/en16052195 - 24 Feb 2023
Cited by 3 | Viewed by 1664
Abstract
The modular multilevel converter (MMC) is a keystone of modern energy transmission systems. Consequently, there is an ongoing pursue for mathematical models to represent it under different configurations and control approaches. In short, this paper introduces an analytical Thévenin-equivalent model for representing the [...] Read more.
The modular multilevel converter (MMC) is a keystone of modern energy transmission systems. Consequently, there is an ongoing pursue for mathematical models to represent it under different configurations and control approaches. In short, this paper introduces an analytical Thévenin-equivalent model for representing the MMC when it is controlled with inner current- and an outer voltage-loop altogether. The model is based on a linearized representation of the converter and conveys the dynamics of passive components, such as submodule capacitors and arm reactors, as well as both control loops. Besides that, the proposed model is divided into a close-loop transfer matrix and the equivalent impedance matrix, both of which represent the relationships between the ac-side dq voltages and currents. We also propose a framework for implementing electromagnetic–transient simulations using the impedance model of this power electronic converter. The framework reduces a multi-bus power grid to a multi-input multi-output (MIMO) feedback system where impedance/admittance matrices of the MMC and other grid elements compose its loops. For validation purposes, it is considered a three-bus power grid comprising one MMC and another two grid-connected VSC. The proposed model was validated by comparing its results with a switching-level PSCAD model of the system. Full article
(This article belongs to the Special Issue Power Electronics and Power Quality 2021)
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18 pages, 8299 KiB  
Article
Motor Stator Insulation Stress Due to Multilevel Inverter Voltage Output Levels and Power Quality
by Arshiah Yusuf Mirza, Ali Bazzi, Hiep Hoang Nguyen and Yang Cao
Energies 2022, 15(11), 4091; https://doi.org/10.3390/en15114091 - 02 Jun 2022
Cited by 4 | Viewed by 1994
Abstract
Multilevel Inverters (MLIs) are widely sought after in medium-voltage applications like electric ships, electric aircraft, and renewable energy integration due to excellent advantages like lower device stress, better power quality, and modularity. However, non-sinusoidal excitations from MLIs pose a serious problem to motor-insulation [...] Read more.
Multilevel Inverters (MLIs) are widely sought after in medium-voltage applications like electric ships, electric aircraft, and renewable energy integration due to excellent advantages like lower device stress, better power quality, and modularity. However, non-sinusoidal excitations from MLIs pose a serious problem to motor-insulation and lead to their premature breakdown. This paper investigates stress in medium-voltage motor insulation when the stator winding is excited by 3-, 5-, and 7-level multilevel inverter output waveforms. The effect of firing angle on insulation stress is also studied for each of the multilevel inverters. Results show that in addition to the number of output voltage levels, PWM wave shape is a critical factor which affects the insulation stress. Both these factors work together to impact the insulation health. A strong correlation is shown between the increase in the voltage root mean square (RMS) value and increase in dielectric stress when ignoring the dv/dt impact for a fixed DC input voltage and operating frequency of the inverter. Similarly, the dielectric stress in the stator insulation increased with an increase in firing angle for each of the MLIs. This paper shows a potential that both the RMSs can be optimized to reduce the insulation stress and improve the power quality of MLIs in medium voltage drives. Full article
(This article belongs to the Special Issue Power Electronics and Power Quality 2021)
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21 pages, 7967 KiB  
Article
Development of a Smart Meter for Power Quality-Based Tariff Implementation in a Smart Grid
by Mayurkumar Rajkumar Balwani, Karthik Thirumala, Vivek Mohan, Siqi Bu and Mini Shaji Thomas
Energies 2021, 14(19), 6171; https://doi.org/10.3390/en14196171 - 27 Sep 2021
Cited by 14 | Viewed by 3174
Abstract
Regarding the modern power smart grid, distribution consumers and prosumers are highly concerned about power quality (PQ). In fact, they would prefer to pay higher prices for a reliable and good quality power supply. Unfortunately, utility operators still aim for reliability alone, ignoring [...] Read more.
Regarding the modern power smart grid, distribution consumers and prosumers are highly concerned about power quality (PQ). In fact, they would prefer to pay higher prices for a reliable and good quality power supply. Unfortunately, utility operators still aim for reliability alone, ignoring the quality of supply voltage and current. There are no clear guidelines for monitoring, penalizing, or implementing PQ-based tariff schemes in LV distribution systems. In addition, the implementation of a PQ-based tariff requires a real-time measuring mechanism at the user end, which is very expensive and difficult to understand for a domestic consumer. This paper presents a novel, low-cost, efficient, and user-friendly smart PQ meter to overcome these issues and limitations. It is essentially a PQ analyzer with energy metering functionality, which implements a novel PQ-based tariff scheme that penalizes consumers violating the PQ limits and provides incentives for a good PQ profile. It measures as many as 28 parameters and keeps track of the PQ for both the consumer and the grid in real-time. This paper demonstrates the specifications, design, and testing of the meter and proves the validity of the concept by practical implementation. The meter is practical, feasible, and economical for implementing PQ-based tariff schemes in LV distribution systems or smart grids. Full article
(This article belongs to the Special Issue Power Electronics and Power Quality 2021)
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Review

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51 pages, 21892 KiB  
Review
A Comprehensive Review on Modular Multilevel Converters, Submodule Topologies, and Modulation Techniques
by Luis A. M. Barros, António P. Martins and José Gabriel Pinto
Energies 2022, 15(3), 1078; https://doi.org/10.3390/en15031078 - 01 Feb 2022
Cited by 12 | Viewed by 5580
Abstract
The concept of the modular multilevel converter (MLC) has been raising interest in research in order to improve their performance and applicability. The potential of an MLC is enormous, with a great focus on medium- and high-voltage applications, such as solar photovoltaic and [...] Read more.
The concept of the modular multilevel converter (MLC) has been raising interest in research in order to improve their performance and applicability. The potential of an MLC is enormous, with a great focus on medium- and high-voltage applications, such as solar photovoltaic and wind farms, electrified railway systems, or power distribution systems. This concept makes it possible to overcome the limitation of the semiconductors blocking voltages, presenting advantageous characteristics. However, the complexity of implementation and control presents added challenges. Thus, this paper aims to contribute with a critical and comparative analysis of the state-of-the-art aspects of this concept in order to maximize its potential. In this paper, different power electronics converter topologies that can be integrated into the MLC concept are presented, highlighting the advantages and disadvantages of each topology. Nevertheless, different modulation techniques used in an MLC are also presented and analyzed. Computational simulations of all the modulation techniques under analysis were developed, based on four cascaded full-bridge topologies. Considering the simulation results, a comparative analysis was possible to make regarding the symmetry of the synthesized waveforms, the harmonic content, and the power distribution in each submodule constituting the MLC. Full article
(This article belongs to the Special Issue Power Electronics and Power Quality 2021)
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