Article
Computer Science, Information Systems
Renan Pillon Barcelos, Jakub Kucka, Drazen Dujic
Summary: The bidirectional resonant DC transformer has all the desired features for driving the development of future DC power distribution networks. This paper proposes a dynamic algorithm to handle the power reversal issue and demonstrates its application through experiments.
Article
Engineering, Electrical & Electronic
Ruiyang Yu, Tianxiang Chen, Pengkun Liu, Alex Q. Huang
Summary: This article introduces a new 3-D parallel winding method with low resistance and low capacitance. Through experimental comparisons and finite element analysis, it demonstrates the effectiveness of this method in improving transformer efficiency and reducing winding loss.
IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS
(2021)
Article
Engineering, Electrical & Electronic
Yue Liu, Hongfei Wu, Jun Zou, Yu Tai, Zixian Ge
Summary: A CLL resonant converter with transformer-inductor-integrated magnetics is proposed, aiming to reduce losses and volume of the magnetic core by removing the circulating current associated with the transformer magnetizing current and increasing the phase difference between the transformer and resonant inductor flux. The integrated transformer-inductor structure is designed for optimized performance and validated through simulation and experimental results.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2021)
Article
Computer Science, Information Systems
Mahmoud Fawzi, Ibrahim Abdelsalam, Ahmed A. Aboushady, Salah A. Abdel Maksoud
Summary: This study proposes an improved control strategy for the Dual Active Bridge technology to address the size limitation issue in power electronic transformers under unbalanced load conditions. By allowing the duty cycle to vary sinusoidally around the operating point, power oscillations are transferred to the high voltage side where their impact is less significant. The results show a successful reduction of voltage ripples, allowing for the use of smaller film capacitors and consequently reducing the overall size and volume of the system.
Article
Engineering, Electrical & Electronic
Zhen Wang, Xianggen Yin, Yu Chen, Jinmu Lai
Summary: This paper presents a power electronic transformer (PET) topology with fault ride-through (FRT) capability. The PET adopts modular multilevel converters (MMCs) and isolated modular multilevel DC converters (IMMDCs), and proposes stability control methods and a coordinated control scheme.
INTERNATIONAL JOURNAL OF ELECTRICAL POWER & ENERGY SYSTEMS
(2022)
Article
Chemistry, Multidisciplinary
Teng Li, Yongbin Shi
Summary: This paper proposes a Modular Multilevel Converter type Railway Power Conditioner with distributed super-capacitor energy storage scheme, which effectively improves power quality and utilizes railway regenerative braking energy through the Virtual Synchronous Generator control strategy and circulating current suppression strategy.
APPLIED SCIENCES-BASEL
(2022)
Article
Engineering, Electrical & Electronic
Jianqiang Liu, Yu Ai, Shaoyong Chen, Zehui Zhang, Yunming Shi
Summary: This article studies the traditional control strategy for the L-LLC resonant converter and its limitations, proposes a novel constant width PFM method, and achieves better control performance through hybrid modulation.
IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS
(2022)
Article
Automation & Control Systems
Yue Liu, Hongfei Wu, Zixian Ge, Guosheng Ji
Summary: This article proposes a universal integration method for the magnetic components (MCs) of multiple resonant converters. Two rules for integration of multiple independent MCs are summarized, one of which is to keep functional independent of MCs after integration, while the other is to achieve lower loss and volume through integration. Integration is achieved by sharing the nonwinding-part of the MCs following the proposed rules. Experimental results have verified the effectiveness and feasibility of the proposed integration methods.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Ui-Min Choi, Jin-Hyuk Park
Summary: A study on the reliability of a solid-state transformer (SST) is conducted, with a focus on its cost and reliability compared to conventional low-frequency (LF) transformers. The study includes the design and experimental verification of an SST for urban railway vehicles, using Si and SiC power devices. The system-level reliability of the designed SST is assessed based on real mission profiles of urban railway vehicles, considering the lifetime of different power devices.
IEEE TRANSACTIONS ON TRANSPORTATION ELECTRIFICATION
(2023)
Article
Engineering, Electrical & Electronic
Haozhe Jin, Wu Chen, Shuai Shao, Liangcai Shu
Summary: This article proposes a high step-ratio modular multilevel resonant dc/dc converter, which can reduce the number of submodules and the size of the filter, and achieve flexible current-shaping capability.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2023)
Article
Chemistry, Multidisciplinary
Zhixian Liao, Yingzong Jiao, Zhiwen Suo, Binbin Li, Xiaodong Zhao, Linjie Han, Dianguo Xu
Summary: This paper proposes a three-port power electronic transformer based on magnetic integration, which can directly obtain low-voltage DC output. It has the advantages of compact structure and reduced cost. Compared with existing transformers, it can save a large amount of magnetic volume and device cost. The feasibility of the transformer has been verified by simulation and experiments.
APPLIED SCIENCES-BASEL
(2022)
Article
Engineering, Electrical & Electronic
Dalton de A. Honorio, Jose W. M. de Araujo, Luiz H. S. C. Barreto, Demercil de S. Oliveira Jr
Summary: This work presents an extensive investigation of a solid-state transformer for medium-voltage railway systems, including an integrated ac-dc bidirectional stage. The study demonstrates the advantages of the proposed topology in this application, such as reduced energy losses and lower number of switches.
IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS
(2022)
Article
Engineering, Electrical & Electronic
Zhixiang Li, Yunqing Pei, Laili Wang, Lie Zhao, Long Pei, Wei Cao
Summary: This article presents a closed-loop voltage ripple control scheme for the MMC-based PET, which offers advantages such as decoupling, high steady-state accuracy, and minimal extra power loss. Experimental results demonstrate that the proposed scheme effectively reduces steady-state error, eliminates couplings, and improves efficiency.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Haozhe Jin, Wu Chen, Yeyuan Xie, Liangcai Shu, Yutao Xu
Summary: This article proposes an optimized asymmetric trapezoidal wave (ATW) modulation scheme for a modular multilevel resonant dc/dc converter (MMRDC) to reduce current stress over wide load and voltage ranges. The optimized operating point of MMRDC is derived based on the soft switching characteristic and reactive current analysis, considering low current stress and zero voltage switching constraint. The experimental results on a 4 kW MMRDC prototype verify the correctness and effectiveness of the analysis and the optimized ATW modulation scheme.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Wanlun Xu, Pei Huang, Zhenxing Liu, Min Zhao, Renjun Dian, Peng Wang, Qi Wang, Dan Wang, Tong Shen
Summary: An improved thermal network model is proposed in this paper, which can more accurately analyze the temperature field distribution and calculate the node temperature. This is important for the safe operation of MFT.
IET GENERATION TRANSMISSION & DISTRIBUTION
(2022)
Article
Engineering, Electrical & Electronic
Gabriele Ulissi, Umamaheswara Reddy Vemulapati, Thomas Stiasny, Drazen Dujic
Summary: This article explores the operational performances of series-connected IGCTs in medium-voltage dc-dc resonant converters. The study focuses on low turn-off currents and voltage sharing within a specific range of snubber capacitance. The results demonstrate successful series connection of IGCTs at 5 kHz.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2022)
Article
Engineering, Electrical & Electronic
Ignacio Polanco, Drazen Dujic
Summary: This article proposes a simple method for monitoring submodule capacitance in a modular multilevel converter, which can be deployed without disturbing or impacting the normal converter operation. Offline and real-time simulations, as well as experimental results, demonstrate the effectiveness of the proposed method in identifying changes in the submodule capacitance.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2022)
Article
Automation & Control Systems
Chengmin Li, Jing Sheng, Drazen Dujic
Summary: In this article, an integrated gate driver is proposed to limit the peak negative gate voltage of SiC MOSFETs and provide reliable short-circuit protection. The crosstalk voltage suppression is achieved through a simple auxiliary branch and the negative peak voltage is eliminated by the high impedance gate driving loop. Furthermore, the auxiliary circuit is used for a two-step short-circuit protection by identifying the shoot-through current.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2023)
Article
Computer Science, Information Systems
Milan Utvic, Philippe Bontemps, Drazen Dujic
Summary: Modular multilevel matrix converter is a converter used for medium-voltage ac-ac power conversion. This paper extends the direct arm energy control concept to the modular multilevel matrix converter, presenting an intuitive and simple control approach with the ability to control the arm energies to arbitrary values, and ensuring stable operation under all conditions.
Article
Computer Science, Information Systems
Ivan Todorovic, Ivana Isakov, Dejan Reljic, Dejan G. Jerkan, Drazen Dujic
Summary: Power systems with distributed generation sources are experiencing more frequency and voltage disturbances, especially in microgrids. To enhance reliability and stability, advanced control structures based on power electronics devices need to be implemented. This paper proposes an algorithm that integrates voltage support, inertia emulation, and current reference management to improve grid operation during various faults. The algorithm was tested in a small microgrid but can be adapted for use in traditional grids with minimal modifications.
Article
Automation & Control Systems
Jakub Kucka, Drazen Dujic
Summary: IGCTs are suitable for medium-voltage dc transformers due to their high efficiency and ability to operate at high frequencies. This study proposes a protection method based on anode-voltage measurement to prevent shoot through.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Philippe Bontemps, Stefan Milovanovic, Drazen Dujic
Summary: Modular multilevel converters achieve voltage scalability by connecting cells in series, each with its own capacitance. However, this structure increases control complexity due to the use of floating energy storage elements. Three control principles and their dynamic performance were explained and compared, using circulating currents for energy exchange. The results were validated using a hardware-in-the-loop platform simulating a hydro power plant.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2023)
Editorial Material
Engineering, Electrical & Electronic
Drazen Dujic
IEEE POWER ELECTRONICS MAGAZINE
(2023)
Article
Computer Science, Information Systems
Pierre Le Metayer, Quentin Loeuillet, Francois Wallart, Cyril Buttay, Drazen Dujic, Piotr Dworakowski
Summary: This article introduces the application of a phase-shifted full bridge (PSFB) converter for medium voltage DC collection networks in photovoltaic power plants. The design of the PSFB converter is presented, and a novel control method is developed and verified. The behavior of the PSFB under different power production profiles and network faults is studied in simulations and validated through experimental verification. The results show that the PSFB converter demonstrates superior fault response compared to other DC-DC topologies, making it suitable for grid-connected operation.
Proceedings Paper
Energy & Fuels
Pierre Le Metayer, Cyril Buttay, Drazen Dujic, Piotr Dworakowski
Summary: A medium voltage rectifier, utilizing series connection of SiC Schottky diodes, is designed and tested in a unidirectional isolated DC-DC converter. The improved model of the rectifier circuit accurately represents voltage oscillations, facilitating the design of snubbers. Experimental results validate the design.
2022 24TH EUROPEAN CONFERENCE ON POWER ELECTRONICS AND APPLICATIONS (EPE'22 ECCE EUROPE)
(2022)
Article
Computer Science, Information Systems
Renan Pillon Barcelos, Jakub Kucka, Drazen Dujic
Summary: The bidirectional resonant DC transformer has all the desired features for driving the development of future DC power distribution networks. This paper proposes a dynamic algorithm to handle the power reversal issue and demonstrates its application through experiments.
Article
Computer Science, Information Systems
Nikolina Djekanovic, Drazen Dujic
Summary: This paper provides insights into the use of hollow copper conductors as windings for high-power density designs, including electrical and thermal modeling, as well as mechanical implementation considerations. Additionally, the winding concept is investigated based on a 1 MW medium frequency transformer prototype.
Proceedings Paper
Computer Science, Interdisciplinary Applications
Daniel Biner, Philippe Bontemps, Drazen Dujic, Cecile Muench-Alligne
Summary: This study investigates the spatial and temporal discretization uncertainties of numerical flow and fatigue damage simulations. Using classical Grid Convergence Index methodology and a design of experiments approach, stress fluctuations and fatigue damage on the Francis pump-turbine runner are revealed under a selected off-design operating point. The results show that the guide vane grid size has the most significant impact on the results, although the correlation between grid sizes and fatigue damage responses is less pronounced.
ADVANCES IN HYDROINFORMATICS: MODELS FOR COMPLEX AND GLOBAL WATER ISSUES-PRACTICES AND EXPECTATIONS
(2022)
Proceedings Paper
Energy & Fuels
Philippe Bontemps, Stefan Milovanovic, Drazen Dujic
Summary: This paper presents a method of splitting the real-time simulation model of the modular multilevel matrix converter into three independent instances using the concept of virtual capacitance. By reducing the number of state space matrices, the model becomes suitable for a small-scale real-time simulator. The proposed concept is verified in a hardware-in-the-loop system.
2022 INTERNATIONAL POWER ELECTRONICS CONFERENCE (IPEC-HIMEJI 2022- ECCE ASIA)
(2022)
Article
Computer Science, Information Systems
D. E. J. A. N. G. JERKAN, D. E. J. A. N. RELJIC, I. V. A. N. TODOROVIC, I. V. A. N. A. ISAKOV, V. L. A. D. O. POROBIC, D. R. A. Z. E. N. DUJIC
Summary: This paper proposes an effective procedure for detecting broken rotor bar (BRB) faults in a three-phase squirrel-cage induction machine (SCIM) through motor current signature analysis (MCSA). The proposed methodology introduces a new BRB feature in the current spectrum which makes it much easier for identification, overcoming the major drawback of traditional MCSA-based methods. Experimental tests validate the proposed methodology and demonstrate its effectiveness and usefulness.
