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Power Converters and Control Techniques
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Power Converters and Control Techniques

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

Deadline for manuscript submissions: closed (31 October 2023) | Viewed by 7707

Special Issue Editors

Dr. Nie Hou

E-Mail Website
Guest Editor
Department of Electrical and Computer Engineering, University of Alberta, Edmonton, AB T6G 2G2, Canada
Interests: DAB converter
Special Issues, Collections and Topics in MDPI journals
Dr. Xialin Li

E-Mail Website
Guest Editor
School of Electrical and Information Engineering, Tianjin University, Tianjin 300072, China
Interests: hybrid AC/DC microgrid; stability and control of power converters dominated system
Prof. Dr. Jinwei He

E-Mail Website
Guest Editor
School of Electrical and Information Engineering, Tianjin University, Tianjin 300072, China
Interests: energy router; hybrid AC/DC microgrid; renewable energy generation and distribution

Special Issue Information

Dear Colleagues,

With the appeal of carbon neutrality, research on renewable energy systems, energy storage systems, electrical transports, and hybrid AC/DC microgrids has steadily increased in recent years. To boost the performance of these systems, power converters and control techniques require more sufficient studies for high efficiency, high reliability, high density, and low cost. Thus, this Special Issue aims to collect research achievements within the scope of power converters and control techniques. Topics of interest in this Special Issue include, but are not limited to:

  • New topologies, including dc–dc converters and ac–dc converters with high efficiency, high density, and low cost, especially with the new emerging devices.
  • New modulation schemes for high power quality and high efficiency.
  • Advanced dynamic control strategies for high robustness and high reliability of power converters.
  • Fault diagnosis and fault tolerance techniques of power converters.
  • Soft start-up and hot-swap operations of power converters.

Dr. Nie Hou
Dr. Xialin Li
Prof. Dr. Jinwei He
Guest Editors

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Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2400 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 converters
  • control techniques
  • dynamic
  • modulation
  • fault diagnosis and fault tolerance
  • start-up and hot-swap operations

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Published Papers (5 papers)

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Research

21 pages, 2500 KiB  
Article
Generalized, Complete and Accurate Modeling of Non-Ideal Push–Pull Converters for Power System Analysis and Control
by Francisco José Vivas, Francisca Segura and José Manuel Andújar
Appl. Sci. 2023, 13(19), 10982; https://doi.org/10.3390/app131910982 - 5 Oct 2023
Cited by 1 | Viewed by 1219
Abstract
Power converters are a basic element for the control and design of any power electronic system. Among the many available topologies, the push–pull converter is widely used due to its versatility, safety and efficiency. For its correct analysis, sizing, simulation and control, models [...] Read more.
Power converters are a basic element for the control and design of any power electronic system. Among the many available topologies, the push–pull converter is widely used due to its versatility, safety and efficiency. For its correct analysis, sizing, simulation and control, models that meet the characteristics of generality, accuracy and simplicity are required, especially if its control is to be optimized by means of some analytical technique. This requires models that consider the practical non-idealities intrinsic to the converter, as well as being intuitive and easy to handle analytically in a control loop. In general, the models reviewed in the scientific literature adopt simplifications in their definition that are detrimental to their accuracy. In response to the posed problem, this work presents a generalized, complete, accurate and versatile model of real (non-ideal) push–pull converters, ideal for the analysis, simulation, and control of power systems. Following the premise of general and complete converters, the proposed model includes all the practical non-idealities of the converter elements, and it is accurate because it faithfully reflects its dynamics. Furthermore, the model is versatile, as its state space formulation allows for its easy adaptability to the converter operating conditions (voltage, current and temperature) for each sampling time. Also, the model is excellent for use in model-based control techniques, as well as for making very accurate simulators. The behavior of the developed model has been contrasted with a real push–pull converter, as well as with reference models present in the scientific literature for both dynamic and steady-state response tests. The results show excellent performance in all the studied cases, with behavior faithful to the real converter and with relative errors that are much lower than those obtained for the reference models. It follows that the model behaves like a digital twin of a real push–pull converter. Full article
(This article belongs to the Special Issue Power Converters and Control Techniques)
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17 pages, 1594 KiB  
Article
Decentralized Robust Control of a Network of Inverter-Based Distributed Generation Systems
by Milad Shojaee and S. Mohsen Azizi
Appl. Sci. 2023, 13(17), 9517; https://doi.org/10.3390/app13179517 - 22 Aug 2023
Cited by 3 | Viewed by 1234
Abstract
This paper presents the design of decentralized robust controllers for a network of inverter-based distributed generation systems with LC filters in the scale of a nanogrid. Using overlapping decomposition, the network of inverters is clustered into several subnetworks such that all inverters within [...] Read more.
This paper presents the design of decentralized robust controllers for a network of inverter-based distributed generation systems with LC filters in the scale of a nanogrid. Using overlapping decomposition, the network of inverters is clustered into several subnetworks such that all inverters within a subnetwork are strongly coupled and there is no or a weak coupling effect between any two inverters from different subnetworks. For the inverters within the same subnetwork, decentralized robust controllers are designed sequentially in the μ-synthesis framework. In addition, all controllers are designed to be robust against ±10% variations in the LC filter parameters. To assess the performance of the proposed sequentially-designed controllers and compare it to that of the benchmark independently-designed ones, the distances between two neighboring inverters from the same and different subnetworks are considered to be 200 (m) and 800 (m), respectively. In this case, time-response and robustness analysis results illustrate the superiority of the proposed sequentially-designed controllers in the overlapping decomposition framework over the benchmark independently-designed ones. Moreover, transient overload and nonlinear load analyses demonstrate that the proposed sequentially-designed decentralized controllers are able to keep the load voltage within ±10% of the nominal value and the harmonic voltage distortions to less than 4%. Full article
(This article belongs to the Special Issue Power Converters and Control Techniques)
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16 pages, 7669 KiB  
Article
Low Current Ripple Parameter-Free MPCC of Grid-Connected Inverters for PV Systems
by Zhilong Yin, Guoze Xu, Feng Yu, Zhiguo Wang and Shuilian Xue
Appl. Sci. 2023, 13(15), 8976; https://doi.org/10.3390/app13158976 - 4 Aug 2023
Viewed by 967
Abstract
With an emphasis placed on a low-carbon economy, photovoltaic grid-connected inverters are moving toward the center of the stage. In order to address the problems related to the strong parameter dependence of the conventional model’s predictive control in grid-connected inverters, an improved parameter-free [...] Read more.
With an emphasis placed on a low-carbon economy, photovoltaic grid-connected inverters are moving toward the center of the stage. In order to address the problems related to the strong parameter dependence of the conventional model’s predictive control in grid-connected inverters, an improved parameter-free predictive current control is proposed. Relying on an extended state observer, an ultralocal model is employed to predict future currents without any parameters. The system can achieve a satisfactory performance in terms of dynamic response and robustness. Additionally, 30 virtual voltage vectors are extended for lower current ripples, which is followed by the use of a triangle candidate strategy to significantly ease the computing burden. In general, the proposed strategy omits parameter dependence, complex tuning work, and large tracking errors. The effectiveness of the proposed model is verified through the experimental results. Full article
(This article belongs to the Special Issue Power Converters and Control Techniques)
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20 pages, 8379 KiB  
Article
Design of a Power Converter for Solar Energy Storage System
by Yih-Her Yan, Yong-Nong Chang and Yan-Yong Wu
Appl. Sci. 2023, 13(10), 5897; https://doi.org/10.3390/app13105897 - 10 May 2023
Viewed by 1627
Abstract
This paper presents a single-stage three-port isolated power converter that enables energy conversion among a renewable energy port, a battery energy storage port, and a DC grid port. The proposed converter integrates an interleaved synchronous rectifier boost circuit and a bidirectional full-bridge circuit [...] Read more.
This paper presents a single-stage three-port isolated power converter that enables energy conversion among a renewable energy port, a battery energy storage port, and a DC grid port. The proposed converter integrates an interleaved synchronous rectifier boost circuit and a bidirectional full-bridge circuit into a single-stage architecture, which features four power conversion modes, allowing energy adjustment for both the renewable energy and the battery storage energy ports when power is supplied by the renewable energy port. It also features bidirectional functionality that allows the battery storage energy port to provide energy storage through the DC grid port, thereby providing uninterrupted power supply functionality. The converter uses four power switches and two inductors to boost and convert energy from the renewable energy port to the battery storage energy port or to the DC grid port through the bidirectional full-bridge circuit. The converter is also capable of 1 kW power energy conversion by utilizing an adjustable duty cycle with a fixed frequency of 100 kHz and phase-shift control through a built-in pulse width modulation control module of a TMS320F28 series digital signal processor. According to the experimental results, the converter developed in this study can achieve a conversion efficiency of up to 94%. Full article
(This article belongs to the Special Issue Power Converters and Control Techniques)
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17 pages, 1130 KiB  
Article
An Improved Voltage Regulation Performance of Floating Interleaved Boost Converters for Fuel Cell Applications Subject to Input Variation and Load Change
by Manh Hung Nguyen and Kyoung Kwan Ahn
Appl. Sci. 2022, 12(22), 11501; https://doi.org/10.3390/app122211501 - 12 Nov 2022
Cited by 2 | Viewed by 1893
Abstract
This paper aims to provide a novel control framework for exactly regulating the output voltage of floating interleaved boost converters (FIBCs), which have been widely employed in fuel cell applications in recent years. Firstly, a mathematical model of the FIBC is constructed according [...] Read more.
This paper aims to provide a novel control framework for exactly regulating the output voltage of floating interleaved boost converters (FIBCs), which have been widely employed in fuel cell applications in recent years. Firstly, a mathematical model of the FIBC is constructed according to Kirchhoff’s current and voltage loop principles. Then a cascade control structure with a current inner loop and voltage outer loop is developed to achieve the desired voltage regulation performance. The current controller is established based on the generalized super-twisting algorithm (GSTA) to ensure that the inductor current exactly follows the current reference, which is generated by the outer loop. Meanwhile, an active disturbance rejection control (ADRC) framework is utilized for robustly regulating the output voltage despite the presence of input variation and load change in the voltage control loop based on a nonlinear continuous GSTA-based extended state observer (GSTA-based ESO). The stability of a closed loop system based on the GSTA controller and the GSTA-based ESO is conclusively proven using the Lyapunov theory. The Simscape model of the FIBC is developed, which is used to verify the feasibility and the appropriateness of the recommended control algorithm. Finally, numerical simulations are carried out to demonstrate the effectiveness of the proposed method compared to several previous works. Full article
(This article belongs to the Special Issue Power Converters and Control Techniques)
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