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State-of-the-Art Research in Advanced Power Electronic Conversion Systems
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State-of-the-Art Research in Advanced Power Electronic Conversion Systems

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

Deadline for manuscript submissions: 25 February 2025 | Viewed by 6959

Special Issue Editors

Dr. Yi-Hung Liao

E-Mail Website
Guest Editor
Department of Electrical Engineering, National Central University, Taoyuan 320, Taiwan
Interests: power electronics; DSP/MCU/FPGA digital control; power control and conversion; energy saving application and research
Prof. Dr. Chungchuan Hou

E-Mail Website
Guest Editor
Department of Electrical Engineering, Chung Hua University, Hsinchu 300, Taiwan
Interests: power electronics

Special Issue Information

Dear Colleagues,

We invite researchers and practitioners to contribute to the Special Issue on “State-of-the-Art Research in Advanced Power Electronic Conversion Systems”. This special issue aims to showcase the latest advancements and innovative research in the field of power electronic circuits, with a focus on sustainable and environmentally friendly solutions. We encourage original research papers that explore various aspects of power electronic circuits and their applications.

Topics of interest for this special issue include, but are not limited to:

  1. AC-DC Converters: Design and optimization of AC-DC converters for efficient power conversion and energy harvesting.
  2. DC-DC Converters: Novel designs and control techniques for DC-DC converters in green electronic systems.
  3. Devices and Components: Development and characterization of eco-friendly electronic devices and components.
  4. Power Integrated Circuit Design: Power IC design for power electronic circuit.
  5. Power Electronics Integration and Manufacturing: Techniques for integrating power electronics into green electronic circuits and scalable manufacturing methods.
  6. Modeling and Simulation: Simulation and modeling approaches for the analysis and optimization of power electronic circuits.
  7. Renewable Energy Systems: Design and optimization of green electronic circuits for renewable energy generation and integration.
  8. Transportation Power Electronics: Power electronics solutions for electric vehicles, hybrid vehicles, and other transportation systems.
  9. Power Electronics Applications: Innovative applications of power electronics in various fields, such as healthcare, agriculture, and smart grids.
  10. Magnetics: Advanced magnetic materials and designs for efficient power conversion in power electronic circuits.

We welcome both theoretical and experimental studies that contribute to the understanding and advancement of power electronic circuits. Manuscripts should be original and not previously published or currently under review elsewhere.

Dr. Yi-Hung Liao
Prof. Dr. Chungchuan Hou
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.

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Published Papers (6 papers)

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Research

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13 pages, 442 KiB  
Article
Experimental Implementation of Reinforcement Learning Applied to Maximise Energy from a Wave Energy Converter
by Fabian G. Pierart, Pedro G. Campos, Cristian E. Basoalto, Jaime Rohten and Thomas Davey
Energies 2024, 17(20), 5087; https://doi.org/10.3390/en17205087 - 13 Oct 2024
Viewed by 1169
Abstract
Wave energy has the potential to provide a sustainable solution for global energy demands, particularly in coastal regions. This study explores the use of reinforcement learning (RL), specifically the Q-learning algorithm, to optimise the energy extraction capabilities of a wave energy converter (WEC) [...] Read more.
Wave energy has the potential to provide a sustainable solution for global energy demands, particularly in coastal regions. This study explores the use of reinforcement learning (RL), specifically the Q-learning algorithm, to optimise the energy extraction capabilities of a wave energy converter (WEC) using a single-body point absorber with resistive control. Experimental validation demonstrated that Q-learning effectively optimises the power take-off (PTO) damping coefficient, leading to an energy output that closely aligns with theoretical predictions. The stability observed after approximately 40 episodes highlights the capability of Q-learning for real-time optimisation, even under irregular wave conditions. The results also showed an improvement in efficiency of 12% for the theoretical case and 11.3% for the experimental case from the initial to the optimised state, underscoring the effectiveness of the RL strategy. The simplicity of the resistive control strategy makes it a viable solution for practical engineering applications, reducing the complexity and cost of deployment. This study provides a significant step towards bridging the gap between the theoretical modelling and experimental implementation of RL-based WEC systems, contributing to the advancement of sustainable ocean energy technologies. Full article
(This article belongs to the Special Issue State-of-the-Art Research in Advanced Power Electronic Conversion Systems)
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22 pages, 7210 KiB  
Article
A Flyback Converter with a Simple Passive Circuit for Improving Power Efficiency
by Woo-Young Choi
Energies 2024, 17(18), 4729; https://doi.org/10.3390/en17184729 - 23 Sep 2024
Viewed by 1107
Abstract
This paper proposes an effective method to improve the power efficiency of the flyback converter in the continuous conduction mode (CCM). The proposed converter uses a simple passive circuit to reduce the switching power losses. The current through the output diode can be [...] Read more.
This paper proposes an effective method to improve the power efficiency of the flyback converter in the continuous conduction mode (CCM). The proposed converter uses a simple passive circuit to reduce the switching power losses. The current through the output diode can be shifted to a new branch where one diode, one inductor, and one auxiliary winding of the transformer are included. The output diode current can be reduced to zero for the zero-current switching of the output diode. The additional inductor is used to control the changing rate of the additional diode current to reduce the reverse-recovery current. Keeping the simplicity of the passive method, the proposed converter improves the power efficiency compared to the conventional converter. The circuit configuration and the operation principle are described. The design considerations are presented, including the simulation verification. The experimental results for a 45 W prototype are discussed to evaluate the performance of the proposed converter. The proposed converter has achieved a power efficiency of 93.5% for the rated load condition, improving the power efficiency. The applications of the proposed converter are also discussed for the future research directions. Full article
(This article belongs to the Special Issue State-of-the-Art Research in Advanced Power Electronic Conversion Systems)
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30 pages, 17253 KiB  
Article
The Influence of Switching Frequency on Control in Voltage Source Inverters
by Zbigniew Rymarski
Energies 2024, 17(17), 4508; https://doi.org/10.3390/en17174508 - 8 Sep 2024
Viewed by 1228
Abstract
This paper aims to show how the switching frequency influences the properties of the digitally controlled voltage source inverter (VSI). The measurements of the Bode plots of the inverter are shown and discussed to present the existing signal delays and power conversion efficiency, [...] Read more.
This paper aims to show how the switching frequency influences the properties of the digitally controlled voltage source inverter (VSI). The measurements of the Bode plots of the inverter are shown and discussed to present the existing signal delays and power conversion efficiency, depending on the switching/sampling frequency. Two types of controllers are presented, Single-Input–Single-Output (SISO) and Multi-Input–Single-Output (MISO), and adequate prediction units (the Smith Predictor for SISO—Coefficient Diagram Method and the full-state Luenberger Observer for MISO—Passivity Based Control) were used to compensate for the delays. It will be shown by comparing the THD of the VSI output voltage that prediction is useful with low VSI switching frequency (about 10 kHz) but is not important for the middle switching frequencies (about 25 kHz) or the high switching frequency (>50 kHz). This paper shows that increasing the switching frequency simplifies digital control without reasonably decreasing efficiency. The theoretical considerations, the Matlab/Simulink 2021b simulations, the final experimental laboratory verification are presented. Full article
(This article belongs to the Special Issue State-of-the-Art Research in Advanced Power Electronic Conversion Systems)
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33 pages, 11872 KiB  
Article
Linear Quadratic Gaussian Controller for Single-Ended Primary Inductor Converter via Integral Linear Quadratic Regulator Merged with an Offline Kalman Filter
by Youssef El Haj and Vijay K. Sood
Energies 2024, 17(14), 3385; https://doi.org/10.3390/en17143385 - 10 Jul 2024
Viewed by 852
Abstract
This paper introduces a Linear Quadratic Gaussian (LQG) controller for a Single-Ended Primary Inductor Converter (SEPIC). The LQG design is based on merging an integral Linear Quadratic Regulator (LQR) with an offline Kalman Filter (commonly referred to as a Linear Quadratic Estimator (LQE)). [...] Read more.
This paper introduces a Linear Quadratic Gaussian (LQG) controller for a Single-Ended Primary Inductor Converter (SEPIC). The LQG design is based on merging an integral Linear Quadratic Regulator (LQR) with an offline Kalman Filter (commonly referred to as a Linear Quadratic Estimator (LQE)). The robustness of the LQG controller is guaranteed based on the separation principle. This manuscript addresses the need to use observer-based systems for the fourth-order SEPIC, which needs a sensor reduction as an essential requirement. This paper provides a comprehensive, yet systematic, approach to designing the LQG system. The work validates the convergences of the states in an LQG system to an actual value. Furthermore, it compares the performance of an LQG system with a benchmark Type-II industrial controller by means of a simulation of the switched converter model in the Simulink/MATLAB 2023a environment. Full article
(This article belongs to the Special Issue State-of-the-Art Research in Advanced Power Electronic Conversion Systems)
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26 pages, 16700 KiB  
Article
A Bidirectional Grid-Tied ZVS Three-Phase Converter Based on DPWM and Digital Control
by Yi-Hung Liao, Faa-Jeng Lin, Ying Zhou, Wei-Rong Lai and Xuan-Sheng Huang
Energies 2023, 16(18), 6453; https://doi.org/10.3390/en16186453 - 6 Sep 2023
Viewed by 1131
Abstract
In this paper, a bidirectional grid-tied ZVS three-phase converter is proposed. The circuit operation principle in both the rectifier and inverter modes was analyzed. The proposed topology could achieve zero-voltage switching in the six main switches and the auxiliary switch both in the [...] Read more.
In this paper, a bidirectional grid-tied ZVS three-phase converter is proposed. The circuit operation principle in both the rectifier and inverter modes was analyzed. The proposed topology could achieve zero-voltage switching in the six main switches and the auxiliary switch both in the rectifier mode and inverter mode. In addition, the reverse recovery current of body diodes in the main switches was also suppressed. Furthermore, in order to realize the ZVS control scheme under the grid-tied bidirectional power flow condition and reduce the number of switchings, a modified carrier-based discontinuous PWM was proposed to fit the bidirectional switching sequence. Finally, a 3 kW prototype was constructed. Some simulation and experimental results are presented to verify the validity of the proposed circuit topology and PWM control scheme. Full article
(This article belongs to the Special Issue State-of-the-Art Research in Advanced Power Electronic Conversion Systems)
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Review

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24 pages, 691 KiB  
Review
Simulators for Conversing Power to Thermal on Green Data Centers: A Review
by Danyang Li, Jie Song, Hui Liu and Jingqing Jiang
Energies 2024, 17(22), 5631; https://doi.org/10.3390/en17225631 - 11 Nov 2024
Viewed by 674
Abstract
This paper aims to help data center administrators choose thermal simulation tools, which manage thermal conduction from power for energy savings. When evaluating and suggesting data center thermal simulators for users, questions such as “What are the simulator’s differences? Are they easy to [...] Read more.
This paper aims to help data center administrators choose thermal simulation tools, which manage thermal conduction from power for energy savings. When evaluating and suggesting data center thermal simulators for users, questions such as “What are the simulator’s differences? Are they easy to use? Which is the best choice?” are frequently asked. To answer these questions, this paper reviews the thermal simulation works for data centers in the last ten years. After that, it proposes the versatility and dexterity metrics for these simulators and discovers that it is difficult to choose them despite their similar design purpose and functions. Empowered by the survey, we claim that the widespread practice simulators still need more enhancement in data center scenarios. We back up our claim by comparing typical simulators and propose improvements to thermal simulators for future studies. Full article
(This article belongs to the Special Issue State-of-the-Art Research in Advanced Power Electronic Conversion Systems)
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