Article
Automation & Control Systems
Kisu Kim, Honnyong Cha
Summary: This article proposes a split-capacitor dual-active-bridge converter, which is found to have higher efficiency compared to conventional DAB converters. Additionally, the adoption of the SC structure eliminates the need for additional DC-blocking capacitors and enables easy connection to other types of converters.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2021)
Article
Automation & Control Systems
Lunbo Deng, Guohua Zhou, Qiang Bi, Nengmou Xu
Summary: This article introduces the significance of using bidirectional dc-dc converters in a dc microgrid and proposes a new algorithm to improve the efficiency within the power range of the converter. The effectiveness of the algorithm is demonstrated through comparisons with other algorithms and experimental validation.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Somnath Khatua, Debaprasad Kastha, Santanu Kapat
Summary: This article introduces a two-stage 48-V voltage regulator module with a hybrid switched-capacitor converter in the first stage, showcasing efficient regulation ability, scalability, and a flat high-efficiency curve for the first stage. The second-stage multiphase buck converter also exhibits flat high-efficiency characteristics through phase shedding. The article also presents steady-state circuit operation, analysis of the first-stage converter, a discrete-time model, design guidelines for the two-stage converter, and experimental results showing a relatively flat high-efficiency profile and faster load transient response.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2021)
Article
Engineering, Electrical & Electronic
Ryo Matsumoto, Toshiyuki Fujita, Hiroshi Fujimoto
Summary: Efficiency of wireless power transfer systems can be improved by compensating for self-inductance variations with controlled switched capacitors. A proposed control scheme eliminates the need for wireless communication by separately controlling the capacitors on the transmitter and receiver sides. Experimental results show significant improvements in both ac/ac efficiency and dc/dc efficiency.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Guo Xu, Jialei Wang, Hui Wang, Yonglu Liu, Dong Liu, Mei Su
Summary: A coupled-inductor-based dual active bridge converter with soft switching capability and low component count is proposed in this article. The coupled-inductor structure enables automatic voltage adjustment at the output side and satisfies the voltage matching requirement of the equivalent leakage inductor. Full load range zero-voltage switching (ZVS) capability is mathematically obtained and the magnetic integration and parameter design are analyzed in detail.
IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS
(2022)
Article
Automation & Control Systems
Liangzong He, Dong Guo
Summary: This article proposes a new switched-capacitor-based half-wave rectifier topology to effectively address the issue of output power fluctuations in wireless power transfer systems. Compared with traditional methods, this topology uses fewer components, achieves soft-switching, while reducing costs, increasing power density, and efficiency.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2021)
Article
Engineering, Electrical & Electronic
Hany A. Atallah
Summary: This paper presents and studies a noteworthy compact dual-band wireless power transfer (DB-WPT) system. The proposed system uses a capacitively loaded interdigital capacitor to achieve high transmission efficiency. The system's operation is verified through fabrication, showing high coupling efficiencies at different frequencies. This design is suitable for compact near-field wireless power transfer applications.
INTERNATIONAL JOURNAL OF CIRCUIT THEORY AND APPLICATIONS
(2023)
Article
Engineering, Electrical & Electronic
Jingxin Hu, Shenghui Cui, Rik W. De Doncker
Summary: The letter introduces a closed-loop black start-up control for the DAB converter, which allows the converter to start up with maximum precharge current while achieving soft-switching operation. This method simplifies the start-up process, reduces the need for parameter fine-tuning, and significantly shortens start-up transients.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2021)
Article
Engineering, Electrical & Electronic
Zhiqiang Guo, Xu Han
Summary: This article presents a control strategy for the single-stage dual active bridge (DAB) ac-dc converters. The proposed control algorithm aims to achieve unit power factor, minimum current stress, and zero voltage switching (ZVS). Additionally, it analyzes the working mode range, as well as the impact of series inductance and transformer turns ratio on conduction loss, and designs suitable parameters for optimization.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2022)
Article
Engineering, Electrical & Electronic
Yu Yan, Handong Gui, Hua Bai
Summary: This letter analyzes the ZVS transient process using the entire H-bridge as a unit and addresses ZVS setting in different modulation strategies. It quantifies the minimal initial inductor energy required to complete the ZVS process, reducing transformer current and enhancing efficiency. The accurate ZVS transition time is derived, incorporating the nonlinearity of switch output capacitance, which can be used to set the dead-band time.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2021)
Article
Engineering, Electrical & Electronic
Chao Li, Hongzhu Li, Ning Wang, Xuanjin Sun, Lihong Cheng
Summary: This article proposes a full soft-switching high step-up dc/dc converter with active switched inductor and three-winding coupled inductor (ASL-TWCI). By utilizing the three-winding coupled inductor (TWCI) with a modified switched capacitor cell, the voltage gain of the ASL-TWCI is further extended without requiring an extreme duty or a high turns ratio of TWCI. Therefore, the voltage stress across the power switches is restricted. By utilizing the leakage energy of TWCI, all semiconductors achieve the zero current switching performance, which has significantly reduced the switching losses of the ASL-TWCI.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Jaydeep Saha, Naga Brahmendra Yadav Gorla, Sanjib Kumar Panda
Summary: This article presents an analytical expression-based modulation scheme for half-bridge MB-DAB, which can achieve full-cycle zero voltage switching and unity power factor operation. Experimental results using a hardware prototype and simulation model validate the feasibility of the proposed modulation approach.
IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS
(2022)
Article
Automation & Control Systems
Peisong Ma, Deshang Sha, Keling Song
Summary: This article proposes a novel single-phase single-stage ac-dc converter based on semi dual-active-bridge dc-dc converter for unidirectional power flow applications. Dual-phase-shift (DPS) and single-phase-shift (SPS) modes are utilized with only two control variables. Optimal voltage and current waveforms are analyzed for different operation modes, and the transition process between DPS and SPS modes is described.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Zhe Wang, Chi Li, Jiye Liu, Zedong Zheng
Summary: This article analyzes the influence of junction capacitance and dead time on the zero voltage switching (ZVS) range of dual active bridges (DABs) and proposes a novel modulation to eliminate this influence. It is found that DABs have an inherent non-ZVS region due to the influence of junction capacitance and dead time. Therefore, a mixed-mode modulation is proposed to enable DABs to avoid operating in the non-ZVS region. Finally, experimental results with a 4.5 kW rated prototype verify that the proposed method can improve efficiency by up to 4% under light load compared to traditional methods ignoring nonideal factors.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Jingxin Hu, Zhiqing Yang, Shenghui Cui, Rik W. De Doncker
Summary: This article proposes an asymmetrical duty-cycle control method for the three-phase DAB converter to extend the soft-switching range and reduce reactive currents. The introduced modulation schemes enable a simple online calculation of control parameters and substantially reduce power losses.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2021)
Article
Engineering, Electrical & Electronic
Liangcai Shu, Wu Chen, Mingming Shi, Ruihuang Liu, Shilong Gao, Fujin Deng
Summary: This article presents an optimized asymmetrical duty-cycle modulation strategy for T-2-DAB converter to ensure zero-voltage switching (ZVS) for switches and reduce current stress over wide power and voltage ranges. The detailed model is established and MATLAB optimization is used to calculate the optimum duty cycle and phase-shift angle. The experimental results show that the proposed control scheme achieves ZVS turn-on for all switches and improves efficiency, especially under light-load and voltage-mismatching situation.
IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS
(2022)
Article
Engineering, Electrical & Electronic
Dong Liu, Tiina Salmi, Fujin Deng, Changqing Ye
Summary: High temperature superconducting generators (HTSGs) show great potential for high power density in future large direct-drive wind turbines. This paper investigates the electromagnetic behavior of a 10 MW, 9.6 rpm HTSG using finite element simulation. The results suggest that increasing the number of armature winding segments can effectively reduce AC losses and field currents.
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
(2022)
Article
Engineering, Electrical & Electronic
Chengkai Liu, Fujin Deng, Xu Cai, Zheng Wang, Zhe Chen, Frede Blaabjerg
Summary: This article investigates the fault detection of the modular multilevel converter (MMC) under light load conditions and proposes a fault detection method based on a rearranged bleeding resistor circuit (RBRC). Experimental results confirm the effectiveness of the proposed method.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2022)
Article
Engineering, Electrical & Electronic
Fujin Deng, Jifeng Zhao, Chengkai Liu, Zheng Wang, Xu Cai, Frede Blaabjerg
Summary: This article proposes a variable frequency control strategy for balancing the temperature distribution among three phases of an MMC in the presence of unbalanced grid voltages. The proposed control effectively improves the reliability of the MMC.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2022)
Article
Engineering, Electrical & Electronic
Yang Xu, Zheng Wang, Pengcheng Liu, Qiang Wei, Fujin Deng, Zhixiang Zou
Summary: In this article, a wind energy conversion system based on modular current-fed high-frequency transformer isolated matrix converters is proposed. By using high-frequency transformers instead of line-frequency input transformers and electrolytic capacitors, the system achieves increased power density, reliability, and efficiency. With electric isolation, wind turbines can be connected in series, allowing integration of offshore wind farms into high-voltage direct current transmission systems.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2022)
Article
Automation & Control Systems
Yang Xu, Zheng Wang, Yinzhen Shen, Zhixiang Zou, Fujin Deng
Summary: This article proposes an optimized space vector modulation method for the isolated three-phase matrix-type AC/DC converter, which effectively utilizes the bidirectional power switch's four-quadrant operation ability. The method eliminates the primary-side transformer current during zero current vectors without additional switching actions, reducing the conduction loss and improving efficiency. It also avoids shoot-through operation and effectively mitigates common-mode voltage in the matrix converter. The modulation strategy maintains the zero current vector and avoids DC-bias current and high-frequency transformer saturation through closed-loop control based on secondary-side current measurement.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Ning Wang, Jianzhong Zhang, Fujin Deng
Summary: This article proposes an improved SiC MOSFET model that accurately predicts the dynamics of the SiC MOSFET in a wide operation range. The model takes into consideration the temperature-sensitive effect, short channel effect, and interface state effect. Experimental tests and simulations demonstrate that the proposed model has good convergence and accuracy in predicting the switching trajectory of the SiC MOSFET.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2023)
Article
Automation & Control Systems
Fujin Deng, Yufei Chen, Jingming Dou, Chengkai Liu, Zhe Chen, Frede Blaabjerg
Summary: This article proposes an isolation forest based submodule switch open-circuit fault localization method for modular multilevel converters (MMCs). The proposed method constructs isolation forests based on continuous sampling of submodule capacitor voltages and compares the outputs to effectively localize the faulty submodule.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2023)
Article
Automation & Control Systems
Yue Zhang, Fujin Deng, Jiehua Hou, Pengyuan Jiang, Hanlu Zhang, Kangshun Zhu, Yihua Hu, Sergio Vazquez
Summary: This article proposes a cascaded MMC and CCV based drive system to overcome the challenge of large capacitor voltage fluctuation in low-speed drive. The MMC provides medium-frequency AC voltage to the CCV, which converts it into low-frequency AC output required by the machine. Detailed analysis of MMC's operation frequency, device current stress, and SM capacitance are presented. The proposed drive system can operate at zero/low frequency under rated load torque, with smaller SM capacitance compared to existing methods. Simulation and experimental studies confirm the effectiveness of the proposed system.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Huailong Li, Fujin Deng, Jifeng Zhao, Jie Tian, Yu Lu, Gang Li
Summary: This article proposes a variable sampling frequency-based power loss balancing control (VSF-PLBC) for the modular multilevel converter (MMC). The VSF-PLBC adjusts the sampling frequency based on the number of faulty submodules (SMs) to balance power loss distribution among the arms of MMCs. The simulation and experimental results confirm the effectiveness of the proposed VSF-PLBC in improving the reliability of the MMC.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Qun Li, Fujin Deng, Jinjiao Lin, Shuangfeng Chen, Haoran Yi, Xiangping Kong
Summary: This article analyzes the problem of capacitor voltage increment in the crossing thyristor branches (CTBs) based hybrid modular multilevel converter (HMMC) under dc-line short-circuit fault, and proposes a method to suppress the voltage increment through bypass control, effectively protecting the performance of the CTB-HMMC under fault conditions.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Ning Wang, Jianzhong Zhang, Fujin Deng
Summary: This article presents a compact SPICE model that accurately predicts the avalanche dynamics of planar SiC MOSFET. Unlike existing models, the proposed model considers the dynamic avalanche resistance, allowing for accurate simulation of the avalanche trajectory in the safety state. Additionally, the novel model describes the thermal runaway phenomenon inside the SiC MOSFET, enabling correct simulation of the avalanche trajectory in the failure state. The model is validated through various tests and exhibits good convergence in different SPICE softwares.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Qiang Yu, Fujin Deng, Yi Tang, Yanbo Wang, Frede Blaabjerg
Summary: This paper proposes an additional-levels-based control method to improve the dc-link current ripple for three-phase modular multilevel converters. It employs conventional modulation to generate ac-side voltage levels and a model predictive control algorithm to produce additional levels for dc-link current performance improvement. The proposed method reduces both high and low order dc-link current ripple without affecting the quality of the ac-side voltage.
INTERNATIONAL JOURNAL OF ELECTRICAL POWER & ENERGY SYSTEMS
(2023)
Article
Engineering, Electrical & Electronic
Yaqian Zhang, Yi Zhang, Jianzhong Zhang, Fujin Deng, Frede Blaabjerg
Summary: This article provides a detailed analysis of the hybrid modular multilevel converter (MMC) operating under the boost AC mode and proposes an improved capacitance design approach to reduce overall capacitance while maintaining performance. The proposed design allows for more cost-effective and space-efficient applications of hybrid MMC in distribution networks.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Huailong Li, Fujin Deng, Jie Tian, Yu Lu, Gang Li, Frede Blaabjerg
Summary: This article proposes a current integral comparison (CIC)-based power loss balancing control (PLBC) for improving the reliability of modular multilevel converters (MMCs). The proposed control not only improves the power loss distribution in each submodule, but also reduces the temperature fluctuation of semiconductors, significantly improving the lifetime of MMCs.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2023)
