Article
Chemistry, Multidisciplinary
Cristian Pesce, Javier Riedemann, Ruben Pena, Ivan Andrade, Werner Jara, Rodrigo Villalobos
Summary: This paper proposes a decoupled control of a dc-dc modular multilevel converter (MMC) based on a double-T topology intended for multi-terminal high voltage direct current (MT-HVdc) transmission systems or emerging distribution systems operating in medium voltage direct current (MVdc). The aim of the proposed control strategy is to obtain an input current with reduced harmonic content and to eliminate the output ac common-mode voltage, which is not allowed in MT-HVdc systems. The control strategy consists of injecting two circulating ac currents and two dc currents that allow the energy balance between the arms of the converter and the general energy balance of the topology. The dc and ac currents are decoupled and allow control over load variations and reference changes in the dc-links. The proposed topology is mathematically modeled and the control method is then derived. Simulation results are presented to validate the proposed system.
APPLIED SCIENCES-BASEL
(2023)
Article
Energy & Fuels
Eladio Duran Aranda, Salvador Perez Litran, Maria Bella Ferrera Prieto
Summary: This paper analyzes, simulates, and verifies an experimental prototype of a four-phase interleaved DC-DC converter based on a SEPIC-Cuk combination. The prototype is used in single-input multiple-output (SIMO) applications and can obtain dual output voltages of the same value from a single input DC voltage. The results show that the interleaved operation mode (IOM) has advantages in terms of ripple at the input and output currents.
CSEE JOURNAL OF POWER AND ENERGY SYSTEMS
(2022)
Article
Automation & Control Systems
Andrei-Constantin Braitor, George Konstantopoulos, Visakan Kadirkamanathan
Summary: This paper investigates the stability of meshed DC micro-grids with constant power loads under decentralized primary and distributed secondary control schemes. The stability of the entire DC micro-grid is analytically proven by analyzing the dynamics of the converters with the loads and the two-layer control. The scalability of the system is ensured through relevant passivity analysis.
Article
Engineering, Electrical & Electronic
Federico Martin Ibanez, Fernando Martin, Joshua Eletu, Jose Martin Echeverria
Summary: This article discusses the use of a new feedforward technique at the input port to modify the input admittance of the load-end dc/dc converter in order to cancel the negative impedance caused by CPLs, mitigating oscillations in dc grids without increasing complexity or adding dissipative elements. Experimental results in a 2000-W test bench validate the proposal, showing that the feedforward technique effectively cancels CPL behavior in the potentially unstable frequency range with minimal impact on voltage rejection from input to output.
IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS
(2021)
Article
Energy & Fuels
Jinmu Lai, Xin Yin, Yaoqiang Wang, Lin Jiang, Zia Ullah, Xianggen Yin
Summary: This paper proposes an isolated bipolar modular multilevel DC-DC converter (BiMMDC) with power self-balancing capability for interconnection of MVDC and LVDC grids. The BiMMDC consists of two series connected MMCs in the MV stage to configure a bipolar MVDC interface, and interleaved converters combined with a dual-transformer in the LV stage to configure the bipolar LVDC interface and provide a self-balancing capability. The operation principles and control scheme of the proposed BiMMDC are discussed, and simulation and CHIL evaluation results are provided to validate its feasibility and effectiveness.
CSEE JOURNAL OF POWER AND ENERGY SYSTEMS
(2023)
Article
Green & Sustainable Science & Technology
Marcus Evandro Teixeira Souza Junior, Luiz Carlos Gomes Freitas
Summary: This work presents the application of power electronics in distributed generation, microgrids, and smart grids. It discusses the trends and challenges in this area and provides an overview of the main technologies and techniques for future investigation. The relationship between power electronics and various types of distributed generation sources is detailed, as well as their role and classification in enhancing the operation of these systems. The same is done for microgrids and smart grids, emphasizing the superior performance achieved with the use of power electronics.
Article
Automation & Control Systems
Grigoris Michos, Pablo R. Baldivieso-Monasterios, George C. Konstantopoulos
Summary: This paper proposes a hierarchical control scheme for achieving economic operation and coupled constraint satisfaction in DC Micro-Grids (MGs) composed of distributed energy resource (DER) units, active loads, and coupled constraints. The control scheme incorporates different control levels, including an improved version of the sl-PI controller, a supervisory controller for economic optimization, and a distributed nonlinear MPC setup. Rigorous analysis is provided to demonstrate the robustness of the system to uncertainties and load variations. Simulated scenarios are presented to demonstrate the effectiveness of the proposed controller.
SYSTEMS & CONTROL LETTERS
(2022)
Article
Engineering, Electrical & Electronic
Yanxun Guo, Haifeng Li, Guangkun Gu, Dehui Zeng, Gang Wang
Summary: DC circuit breakers (DCBs) are used to isolate faults in high-voltage DC grids. Multiple DCBs connected to multiple lines form a DCB cluster, which can be integrated into a multiport DCB (MDCB) to reduce construction costs. This article proposes a novel MDCB to integrate current-injection-DCBs (C-DCBs) for improved interruption reliability. The proposed MDCB is compared with traditional DCB clusters and previous MDCBs to show economic and reliability advantages, and is validated using simulations.
IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS
(2021)
Article
Automation & Control Systems
Mahdieh S. Sadabadi, Nenad Mijatovic, Jean-Francois Tregouet, Tomislav Dragicevic
Summary: This article proposes a resilient and robust cooperative distributed control approach for voltage regulation and balanced current sharing in parallel dc-dc converters, even in the presence of false data injection attacks.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2022)
Article
Automation & Control Systems
Shuo Zhang, Guibin Zou, Xiuyan Wei, Chenjun Sun
Summary: This article introduces a diode-bridge multiport HCB to address the drawbacks of traditional HCBs in terms of economy and volume. By integrating multiple HCBs into a single n-port HCB, the number of semiconductor switches and footprint can be reduced while maintaining good current interruption performance.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2021)
Article
Engineering, Electrical & Electronic
Willem Lambrichts, Mario Paolone
Summary: In this paper, an exact and linear measurement model for hybrid AC/DC micro-grids is proposed for recursive state estimation. The model includes an exact linear model of a voltage source converter and accounts for various losses. Synchronized measurements are provided by phasor measurement units and DC measurement units. An adaptive Kalman Filter is also proposed to improve the resilience and speed of state estimation.
IEEE TRANSACTIONS ON SMART GRID
(2023)
Article
Engineering, Electrical & Electronic
Thiago Pereira, Felix Hoffmann, Rongwu Zhu, Marco Liserre
Summary: MTB dc-dc converters offer an interesting compromise between non-modular and modular converters, providing fault-tolerant possibilities but also facing technical challenges, especially in the design of resonant topology due to cross-coupling effects. The article reviews the history of MTB dc-dc converters, provides a classification, and analyzes problems arising from cross-coupling effects and potential fault-tolerant operation through simulation and experimental results.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2021)
Article
Engineering, Electrical & Electronic
Pawel Gorecki
Summary: This article proposes an electrothermal model of a diode-insulated gate bipolar transistor switch for modeling dc-dc converters. The model can compute both the electrical characteristics of the converter and the junction temperatures of the semiconductor devices. The model's equations allow for modeling the converter's operation in both continuous conduction mode and discontinuous conduction mode. The correctness of the model is experimentally verified for the boost converter, showing good accuracy in modeling the converter's characteristics. An active .cir file based on the model for analysis in the SPICE program is attached to the article.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2022)
Article
Engineering, Electrical & Electronic
Hoda Sorouri, Mostafa Sedighizadeh, Arman Oshnoei, Rahmat Khezri
Summary: This paper proposes a backstepping controller with a nonlinear disturbance observer to regulate the output voltage of a Buck DC-DC converter in a DC microgrid. The controller effectively dampens the ripples caused by load condition changes and adapts to uncertainties in the microgrid using an artificial neural network. The effectiveness of the proposed control method is verified through simulations and experiments.
INTERNATIONAL JOURNAL OF ELECTRICAL POWER & ENERGY SYSTEMS
(2022)
Article
Engineering, Electrical & Electronic
Pingyang Sun, Harith R. Wickramasinghe, Muhammad Khalid, Georgios Konstantinou
Summary: This paper investigates the stable and secure operation of hybrid multi-converter dc grids, formed by combinations of different converter topologies. It proposes fault handling schemes that provide satisfactory transient response and an expanded expression of dc power flow considering initial power flow determination and power flow after converter outages. Simulation results verify the accuracy of the proposed expression and validate the fault handling capability of the hybrid dc grid.
INTERNATIONAL JOURNAL OF ELECTRICAL POWER & ENERGY SYSTEMS
(2022)
Article
Energy & Fuels
Julio Jose Caparros Mancera, Jaime Luis Saenz, Eduardo Lopez, Jose Manuel Andujar, Francisca Segura Manzano, Francisco Jose Vivas, Fernando Isorna
Summary: This paper presents a comprehensive experimental analysis on the influence of using supercapacitor banks as energy storage system in renewable energy sources-based microgrids with high voltage DC bus. The results demonstrate that the supercapacitor banks provide a smooth dynamic response, more efficient and flexible power management, and greater voltage stability, while also protecting the equipment from current peaks.
Editorial Material
Energy & Fuels
Sergio Gomez Melgar, Jose Manuel Andujar Marquez
Review
Environmental Sciences
C. Martinez-Sanchez, I. Robles, L. A. Godinez
Summary: This paper reviews recent advances in electrochemical advanced oxidation processes (EAOPs) for treating effluents contaminated with dyes, pharmaceuticals, and pesticides. The effectiveness of EO, EF, and PA-EF processes varies for different organic contaminants, with EO being more efficient for simpler molecules and EF/PA-EF being more suitable for complex molecules.
INTERNATIONAL JOURNAL OF ENVIRONMENTAL SCIENCE AND TECHNOLOGY
(2022)
Review
Computer Science, Information Systems
Salvador P. Litran, Eladio Duran, Jorge Semiao, Cristian Diaz-Martin
Summary: Multiple-output DC-DC converters play a crucial role in many applications, and integrated solutions are being developed by manufacturers. The current trends involve low losses, high-power density, high efficiency, and new architectures and control strategies. The use of wide band gap materials is expected to establish future trends, with pros and cons. This paper presents various topologies, configurations, applications, and trends of multiple-output DC-DC converters.
Article
Agronomy
Miguel Noguera, Borja Millan, Jose Manuel Andujar
Summary: This study presents a low-cost, handheld multispectral device for assessing crop ripeness. The device, based on a development board, demonstrates good performance in predicting the indicators of soluble solid content and titratable acidity, as validated through experiments with 80 grape samples.
Article
Electrochemistry
Jose M. Andujar, Antonio J. J. Barragan, Francisco J. J. Vivas, Juan M. M. Enrique, Francisca Segura
Summary: Electric vehicles have become the main alternative for decarbonizing the vehicle fleet, and their technology is closely linked to lithium-ion battery technology. It is crucial to have an accurate mathematical model to predict the dynamic behavior of lithium-ion batteries in demanding applications such as electric vehicles. This paper presents a methodology using the extended Kalman filter to iteratively improve a fuzzy model applied to a real lithium-ion battery, adapting the model to the battery's characteristics throughout its operating cycle.
Article
Computer Science, Information Systems
Macarena Martinez, Francisca Segura, Jose Manuel Andujar
Summary: This paper presents a standardized training platform supported by five European universities, which includes a remote laboratory experience. Each university develops a training module focused on renewable energy, and together they create a European network for teachers and students to access teaching materials in the new digital era.
APPLIED SYSTEM INNOVATION
(2023)
Review
Energy & Fuels
Jesus Rey, Francisca Segura, Jose Manuel Andujar
Summary: The current climate crisis highlights the urgent need to reduce carbon emissions, leading to an increased reliance on renewable energy sources. However, the intermittent nature of these sources makes controllability challenging. Green hydrogen, produced through water electrolysis using renewable energy, is emerging as a potential solution. This research focuses on analyzing the water and energy footprint, technological maturity, and regulatory framework of green hydrogen, highlighting its deployment and existing disparities worldwide.
Article
Chemistry, Multidisciplinary
Cristian Diaz-Martin, Eladio Duran, Salvador P. Litran, Jose Luis Alvarez, Jorge Semiao
Summary: This paper presents a new configuration of Cuk and SEPIC combination DC-DC converter for bipolar output with a single switch. The configuration employs a single ground-referenced power switch, simplifying the gate drive design and providing a bipolar output voltage. It offers dual-output voltage by switching the power switch to zero voltage, making it suitable for applications that require small size, light weight, and high power density.
APPLIED SCIENCES-BASEL
(2023)
Article
Chemistry, Multidisciplinary
Francisco Jose Vivas, Francisca Segura, Jose Manuel Andujar
Summary: This article presents a generalized, complete, accurate and versatile model of real push-pull converters for the analysis, simulation, and control of power systems. The proposed model considers practical non-idealities and has excellent performance with low relative errors.
APPLIED SCIENCES-BASEL
(2023)
Article
Computer Science, Information Systems
Jesus Rey, Francisca Segura, Jose Manuel Andujar, Andrea Monforti Ferrario
Summary: This paper presents an economic impact analysis and carbon footprint study of a hydrogen-based microgrid. The results show that the hydrogen-based strategy has higher replacement costs and operation and maintenance costs, but provides better annual savings and a lower carbon footprint than the battery-based strategy. Furthermore, in a scenario where CO2 emission prices are increasing, the hydrogen-based strategy will bring even higher annual cost savings in the coming years.
Article
Agronomy
Ricardo Egipto, Arturo Aquino, Joaquim Miguel Costa, Jose Manuel Andujar
Summary: This study assesses the accuracy of supervised machine learning regression algorithms in predicting crop evapotranspiration, with satisfactory results. The research shows that these algorithms can accurately estimate crop evapotranspiration for vineyards while reducing data requirements.
Article
Education & Educational Research
Macarena Martinez, Francisca Segura, Jose Manuel Andujar, Yolanda Ceada
Summary: The number of job offers in STEM careers is increasing while the number of graduates, especially women graduates, in these fields is decreasing. This research analyzes the causes of low participation of women in STEM fields using the expectancy-value theory of motivation, social role theory, and gender stereotypes theory. The findings suggest that social patterns and educational environment play crucial roles in young people's decision to pursue STEM careers.
EDUCATION SCIENCES
(2023)
Article
Energy & Fuels
Eladio Duran Aranda, Salvador Perez Litran, Maria Bella Ferrera Prieto
Summary: This paper analyzes, simulates, and verifies an experimental prototype of a four-phase interleaved DC-DC converter based on a SEPIC-Cuk combination. The prototype is used in single-input multiple-output (SIMO) applications and can obtain dual output voltages of the same value from a single input DC voltage. The results show that the interleaved operation mode (IOM) has advantages in terms of ripple at the input and output currents.
CSEE JOURNAL OF POWER AND ENERGY SYSTEMS
(2022)
