Special Issue "Emerging Power Electronics Technologies"

A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Energy".

Deadline for manuscript submissions: closed (28 February 2019)

Special Issue Editor

Guest Editor
Prof. Dr. Tomonobu Senjyu

Faculty of Engineering, University of the Ryukyus, 1 Senbaru Nishihara-cho Nakagami Okinawa 903-0213, Japan
Website | E-Mail
Phone: 098-895-8686
Interests: renewable energy, power system analysis, power system optimization, distribution system control and optimization, power system control, power electronics in power systems

Special Issue Information

Dear Colleagues,

The Guest Editor is inviting submissions to a Special Issue of Applied Sciences on the subject area of “Emerging Power Electronics Technologies”. Power electronics technologies play an important role in efficient energy usages in recent years. This trend will increase, year-by-year, in the areas of power systems, tractions, renewable resources, and consumer appliances.

This Special Issue focuses on emerging power electronic topologies and applications for power systems and traction systems, as well as consumer appliances. Topics of interest for publication include, but are not limited to:

  • Emerging new topologies for inverters/converters;
  • High voltage DC transmission systems;
  • Novel renewable energy converter/inverter systems;
  • Virtual synchronous generator;
  • Smart inverter;
  • Electrical machines, drives, systems and applications;
  • New topologies for high voltage inverter/converter;
  • New applications for power electronics;
  • Power electronics in smart grid;
  • AC/DC converters and inverters;
  • Control and optimization of power electronic circuit;
  • Distributed generation for power electronics;
  • Recent traction systems for vehicles, trains and ships;
  • Demand side electrification and management with power electronics;
  • Power electronics for smart house;
  • Power electronics for smart cities;
  • Optimization of power electronics circuit;
  • Control issue for power electronics

Prof. Tomonobu Senjyu
Guest Editor

Manuscript Submission Information

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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. Applied Sciences 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 1500 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

  • All electric type converters/inverters
  • Novel converters/inverters topologies
  • Motor drive applications
  • Power systems
  • Electric distribution systems
  • Consumer appliances
  • Optimization and/or control of power electronics

Published Papers (8 papers)

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Research

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Open AccessArticle Examination of Multi-Pulse Rectifiers of PES Systems Used on Airplanes Compliant with the Concept of Electrified Aircraft
Appl. Sci. 2019, 9(8), 1520; https://doi.org/10.3390/app9081520
Received: 28 February 2019 / Revised: 29 March 2019 / Accepted: 31 March 2019 / Published: 12 April 2019
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Abstract
This article focuses on power electronic multi-pulse 12-, 24- and 36-impulse rectifiers based on multi-winding rectifier transformers. The effectiveness of voltage processing with different variants of supply voltage sources is discussed and arguments are formulated for limiting oneself to 24-pulse processing, which is [...] Read more.
This article focuses on power electronic multi-pulse 12-, 24- and 36-impulse rectifiers based on multi-winding rectifier transformers. The effectiveness of voltage processing with different variants of supply voltage sources is discussed and arguments are formulated for limiting oneself to 24-pulse processing, which is used in the latest technological solutions of modern aviation technology. The main purpose of this article is to conduct a study (analysis, mathematical models, simulations) of selected multi-pulse rectifiers in the context of testing their properties in relation to the impact on the electrified power supply network. The secondary objective of the article is to assess the possibility of using Matlab/Simulink to analyze the work of rectifier circuits implemented in aircraft networks compliant with the more/all electric aircraft (MEA/AEA) concept. The simulation tests included designing a typical auto-transformer rectifier unit (ATRU) system in the Simulink program and generating output voltage waveforms in this program in the absence of damage to the rectifier elements. In the final part of this work, based on a critical analysis of the literature on the subject of the study, simulations were made of exemplary rectifiers in the Matlab/Simulink programming environment along with their brief analysis. Practical conclusions resulting from the implementation of the MEA/AEA concept in modern aviation were formulated. Full article
(This article belongs to the Special Issue Emerging Power Electronics Technologies)
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Open AccessArticle Circulating Current Reduction in MMC-HVDC System Using Average Model
Appl. Sci. 2019, 9(7), 1383; https://doi.org/10.3390/app9071383
Received: 6 March 2019 / Revised: 27 March 2019 / Accepted: 28 March 2019 / Published: 1 April 2019
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Abstract
Modular multilevel converters (MMCs) are quickly emerging as a suitable technology for a voltage-source converter-based high-voltage direct-current (VSC-HVDC) transmission systems due to its numerous advantages as reported in literature. However, for a large DC-network, MMCs require large numbers of sub-modules (SMs) and switches, [...] Read more.
Modular multilevel converters (MMCs) are quickly emerging as a suitable technology for a voltage-source converter-based high-voltage direct-current (VSC-HVDC) transmission systems due to its numerous advantages as reported in literature. However, for a large DC-network, MMCs require large numbers of sub-modules (SMs) and switches, which makes its modeling very challenging and computationally complex using electromagnetic transient (EMT) programs. Average Value Model (AVM) provides a relatively better solution to model MMCs by combining cells as an arm equivalent circuit. Circulating current is an important issue related to the performance and stability of MMCs. Due to circulating currents, power loss in a converter increases as root mean square (RMS) values of the arm current increases. The traditional method for inserting SMs in each arm is based on direct modulation, which does not compensate for the arm voltage oscillations, and generates circulating current in each leg of a three-phase MMC. This paper presents a new method for reducing the circulating current by adding 2nd and 4th harmonics in the upper and lower arm currents of an MMC. Less capacitor energy variations are obtained by the proposed method compared to traditional direct modulation methods. The proposed method is tested on a common symmetrical monopole (point-to-point) MMC-HVDC system using vector current control strategy in PSCAD/EMTDC software. Analytical and simulation results show the effectiveness of the new method in minimizing the circulating current and arm voltage oscillation reductions as compared to the direct modulation approach. Full article
(This article belongs to the Special Issue Emerging Power Electronics Technologies)
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Open AccessArticle SVPWM Method for Multilevel Indirect Matrix Converter with Eliminate Common Mode Voltage
Appl. Sci. 2019, 9(7), 1342; https://doi.org/10.3390/app9071342
Received: 26 February 2019 / Revised: 19 March 2019 / Accepted: 25 March 2019 / Published: 30 March 2019
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Abstract
The multilevel indirect matrix converter (IMC) is a merit of power converter for feeding a three-phase load from three-phase power supply because it has several attractive features such as: Sinusoidal input/output currents, bidirectional power flow, long lifetime due to the absence of bulky [...] Read more.
The multilevel indirect matrix converter (IMC) is a merit of power converter for feeding a three-phase load from three-phase power supply because it has several attractive features such as: Sinusoidal input/output currents, bidirectional power flow, long lifetime due to the absence of bulky electrolytic capacitors. As compared to the conventional IMC, the multilevel IMC provides high output performance by increasing the level of output voltage. In this paper, the novel approach topology of multilevel IMC by using the combination of the cascaded rectifier and the three-level T-Type inverter is introduced. Furthermore, the new space vector pulse width modulation (SVPWM) method for the presented multilevel IMC that eliminate the common-mode voltage is proposed in this paper. The simulation study is carried out in PSIM software to verify the proposed modulation method. Then, an experimental system is built using a three-phase RL load, a multilevel IMC, a DSP controller board and other elements to verify the effectiveness of the proposed modulation method. Some simulation and experimental results are illustrated to confirm the theory analysis. Full article
(This article belongs to the Special Issue Emerging Power Electronics Technologies)
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Open AccessArticle Research on the Structure and Control Strategy of a Novel Power Electronic Transformer for AC/DC Hybrid Distribution Network
Appl. Sci. 2019, 9(4), 727; https://doi.org/10.3390/app9040727
Received: 23 January 2019 / Revised: 14 February 2019 / Accepted: 16 February 2019 / Published: 19 February 2019
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Abstract
Power electronic transformers (PETs), as the core devices of the energy internet, are the key to achieve both effective consumption for renewable energy and the safe and coordinated operation for AC/DC hybrid system. In order to overcome the shortcomings of the existing PETs, [...] Read more.
Power electronic transformers (PETs), as the core devices of the energy internet, are the key to achieve both effective consumption for renewable energy and the safe and coordinated operation for AC/DC hybrid system. In order to overcome the shortcomings of the existing PETs, a novel PET with an improved structure that applicable for multi-voltage level AC/DC hybrid distribution network is proposed. The topology of the proposed PET is analyzed, and the corresponding control methods are suggested for different parts. The input stage utilizes the modular multilevel converter structure and applies the virtual synchronous machine control strategy to enhance the inertia and damping of the system. The power of the output stage is adjusted flexibly and that enables the PET to provide certain power support to the upper grid and participate in its primary frequency regulation. A combined connection of input-series output-series and input-series output-parallel is applied for the dual-active-bridge modules of the isolation stage to enable network interconnection and electrical isolation of AC/DC grids with significantly different voltage levels. A power coordinated control method is then proposed to meet the power demand of the distribution networks connected to the output stage and ensure stable operations of PET simultaneously. The reliability and efficiency of the proposed PET topology and control strategy for AC/DC hybrid distribution network are finally verified via PSCAD/EMTDC simulation. Full article
(This article belongs to the Special Issue Emerging Power Electronics Technologies)
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Open AccessFeature PaperArticle Low-Voltage Solid-State DC Breaker for Fault Protection Applications in Isolated DC Microgrid Cluster
Appl. Sci. 2019, 9(4), 723; https://doi.org/10.3390/app9040723
Received: 2 January 2019 / Revised: 5 February 2019 / Accepted: 14 February 2019 / Published: 19 February 2019
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Abstract
Due to the interconnected scheme of multiple components, such as distributed generators, storage systems, and loads through converters to a common bus in DC microgrids, the possibility of fault occurrence is increasing significantly. Meanwhile, due to the huge and rapid increase of short-circuit [...] Read more.
Due to the interconnected scheme of multiple components, such as distributed generators, storage systems, and loads through converters to a common bus in DC microgrids, the possibility of fault occurrence is increasing significantly. Meanwhile, due to the huge and rapid increase of short-circuit currents, the development of a small- and large-scale DC system requires a reliable and fast protection system to ensure fault clearance and maintain safety for the rest of the system. Thus, fault protection has been focused on as one of the most critical issues in a direct current network. The application of traditional circuit-breakers for DC fault protection has the drawback of slow operation, which requires a high rating power equipment. Recently, the high speed and excellent performance capabilities of semiconductor breakers have attracted a lot of attention and been considered as an optimal solution for fast DC fault interruption. In this study, a bidirectional Insulated-Gate Bipolar Transistor (IGBT) semiconductor breaker, suitable for the fault protection of low-voltage DC networks, is proposed. The operating characteristics of this breaker are based on changes in the circuit current and terminal voltage of IGBTs. It detects the abrupt change of the terminal voltage as an abnormal condition and isolates the faulted branch in a short time to prevent the operation disturbance in the healthy part of the network. Therefore, for the entire protection of a typical 400V DC-microgrid cluster, breakers need to be integrated and examined in each branch and the interconnected lines. The proposed protection method in this study is examined in a Simulink®/MATLAB environment to analyze and assess its operation. Full article
(This article belongs to the Special Issue Emerging Power Electronics Technologies)
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Open AccessArticle Voltage Ride through Control Strategy of Modular Multilevel Converter under Unbalanced Voltage Sag
Appl. Sci. 2019, 9(3), 551; https://doi.org/10.3390/app9030551
Received: 10 December 2018 / Revised: 28 January 2019 / Accepted: 1 February 2019 / Published: 7 February 2019
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Abstract
This paper develops modeling and describes a control strategy for a modular multilevel converter (MMC) for grid-connected renewable energy systems. The proposed model can be used to simulate MMC activity during normal and faulty situations. Firstly, a dynamic model of a grid-connected MMC [...] Read more.
This paper develops modeling and describes a control strategy for a modular multilevel converter (MMC) for grid-connected renewable energy systems. The proposed model can be used to simulate MMC activity during normal and faulty situations. Firstly, a dynamic model of a grid-connected MMC (GC-MMC), based upon the symmetrical component of voltages and currents, was designed. Then an adaptive robust control approach was established in order to follow the reference currents of the converter and stabilize the submodule (SM) capacitor voltage. The positive and negative sequences of reference currents that were given from the demanded active and reactive power during grid voltage disturbance and a normal situation were then utilized in control loops. Finally, the numerical results for the performance of the MMC throughout voltage sag conditions and the effect of uncertainties on the filter parameters during changing power demands were evaluated. The results specified that the current control strategy is more potent under voltage sag situations and able to fulfill the stability requirements of the MMC. Full article
(This article belongs to the Special Issue Emerging Power Electronics Technologies)
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Open AccessArticle On the Innovation Design for Two-Motor Transmissions with Eight-Link Mechanisms in the Electric Vehicles
Appl. Sci. 2019, 9(1), 140; https://doi.org/10.3390/app9010140
Received: 2 December 2018 / Revised: 25 December 2018 / Accepted: 27 December 2018 / Published: 3 January 2019
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Abstract
A decade ago, electric vehicles (EV) made a boom in the automobile market, as they started to become a growing market section in the transportation space. The reasons behind the boom were to decrease environmental pollution by reducing the use of fossil fuels, [...] Read more.
A decade ago, electric vehicles (EV) made a boom in the automobile market, as they started to become a growing market section in the transportation space. The reasons behind the boom were to decrease environmental pollution by reducing the use of fossil fuels, lowering transportation operating costs, and increased general consumer interest in the new technology. This work generates a streamlined process for the design and simulation of motor transmissions with eight-link mechanisms. This procedure presents a wide range of motor transmissions such as 34 new clutchless systems and 34 new clutched systems. Two novel feasible motor transmissions of the design process are taken as a sample to dissect the working principle conjoined both power flow paths and operation modes. In addition, these designs are conducted for modeling and computer simulation procedures that obtain the results of the energy management strategy and operation mode variation. Full article
(This article belongs to the Special Issue Emerging Power Electronics Technologies)
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Review

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Open AccessReview Review of VSG Control-Enabled Universal Compatibility Architecture for Future Power Systems with High-Penetration Renewable Generation
Appl. Sci. 2019, 9(7), 1484; https://doi.org/10.3390/app9071484
Received: 28 February 2019 / Revised: 16 March 2019 / Accepted: 26 March 2019 / Published: 9 April 2019
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Abstract
Due to the irreversible energy substitution from fossil fuels to clean energy, the development trend of future power systems is based on renewable energy generation. However, due to the incompatibility of converter-based non-dispatchable renewable energy generation, the stability and reliability of traditional power [...] Read more.
Due to the irreversible energy substitution from fossil fuels to clean energy, the development trend of future power systems is based on renewable energy generation. However, due to the incompatibility of converter-based non-dispatchable renewable energy generation, the stability and reliability of traditional power systems deteriorate as more renewables are introduced. Since conventional power systems are dominated by synchronous machines (SM), it is natural to utilize a virtual synchronous generator (VSG) control strategy that intimates SM characteristics on integrated converters. The VSG algorithm developed in this paper originates from mimicking mathematic models of synchronous machines. Among the different models of implementation, the second-order model is simple, stable, and compatible with the control schemes of current converters in traditional power systems. The VSG control strategy is thoroughly researched and case studied for various converter-interfaced systems that include renewable generation, energy storage, electric vehicles (EV), and other energy demands. VSG-based integration converters can provide grid services such as spinning reserves and inertia emulation to the upper grids of centralized plants, distributed generation networks, and microgrids. Thus, the VSG control strategy has paved a feasible way for an evolutionary transition to a power electronics-based future power grid. By referring to the knowledge of traditional grids, a hierarchical system of operations can be established. Finally, generation and loads can be united in universal compatibility architecture under consolidated synchronous mechanisms. Full article
(This article belongs to the Special Issue Emerging Power Electronics Technologies)
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