Article
Engineering, Electrical & Electronic
Nibedita Parida, Anandarup Das
Summary: This article presents an isolated dc-dc modular multilevel converter topology designed to extract power from the HVdc link, featuring two stages of power conversion and a high-voltage transformation ratio. Operating at medium-frequency ac reduces the size of the transformer and passive elements, while implementing a sinusoidal level-shifted pulsewidth modulation technique ensures voltage close to a sine wave.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2021)
Article
Engineering, Electrical & Electronic
Wentao Cui, Shuai Shao, Tong Wu, Wu Chen, Junming Zhang
Summary: In this article, a full-range soft switching converter with wide voltage gain is proposed for modular multilevel resonant dc-dc converters. The converter utilizes a modular multilevel structure and CLLC resonant tank for isolated and bidirectional power conversion in medium-voltage applications, achieving high efficiency. The coordinated gain control method enables wide and continuous voltage gain regulation.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Shanshan Zhao, Yu Chen, Shenghui Cui, Benedict Justin Mortimer, Rik W. De Doncker
Summary: This study proposes an operation scheme that enables fully independent three-port bidirectional operation of MMDC, expanding its application scope and simplifying the complexity of power flow control.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2021)
Article
Engineering, Multidisciplinary
Mai Diab, Ahmed A. Elserougi, A. S. Abdel-Khalik
Summary: This paper presents a hybrid modular multilevel DC-DC converter topology that successfully solves the issue of capacitors voltage imbalance during DC-DC conversion. The proposed converter can achieve arm energy equalization and operate as a DC transformer.
ALEXANDRIA ENGINEERING JOURNAL
(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
Computer Science, Information Systems
Ming Huang
Summary: This paper proposes a non-isolated DC-DC MMC equipped with middle cells for interconnecting different DC voltages in medium-voltage applications. It achieves DC voltage conversion without bulky passive LC filters.
Article
Engineering, Electrical & Electronic
Lin Zhu, Chushan Li, Huan Yang, Shengdao Ren, Shilei Zhang, Wuhua Li, Xiangning He
Summary: This article proposes a generalized buck-boost type high step-down converter (BHSC) structure to address the problem of a lower power circuit directly fed by MVDC. The BHSC structure offers high modularity, simple structure, and low cost, with the ability to achieve voltage balance.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Govind Avinash Reddy, Anshuman Shukla
Summary: In this article, a new enhanced modular multilevel converter (EMMC) is introduced, which addresses the drawbacks of the conventional modular multilevel converters (MMC). The EMMC, based on a new submodule (SM) structure, is fully modular and requires fewer switches and capacitors. It possesses the features of reduced energy-storage requirement and dc fault-tolerant capability.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Xin Xiang, Yunjie Gu, Yang Qiao, Xiaotian Zhang, Wuhua Li, Xiangning He, Timothy C. Green
Summary: DC transformers based on power electronics are key items for MVDC distribution systems, allowing connections between different voltage DC links. This article presents the circuit evolution of high and low step-ratio RMMC, providing a wider variety of connection options for MVDC distribution systems.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2021)
Article
Automation & Control Systems
Saurav Dey, Tanmoy Bhattacharya
Summary: A modular multilevel dc-dc converter philosophy is proposed in this article to exchange power between HVdc links of different voltage levels. The converter operates symmetrically in four quadrants, unaffected by voltage polarity, allowing power flow direction/magnitude to remain constant even with reversal of power flow in the HVdc link. The working principle is analytically explained and validated through simulation and experimental results.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2021)
Article
Engineering, Electrical & Electronic
Jian Liu, Dong Dong
Summary: This article presents a modified MMC called HL-MMC, which integrates HV voltage source converters (VSCs) to replace a portion of MMC submodules (SMs), resulting in reduced cost and conduction losses. The HL-MMC also reduces the energy storage requirement and provides a dc-fault tolerant capability through the combination of HV VSCs and a dc hybrid circuit breaker. Experimental validation and simulation models are provided to illustrate the effectiveness of the proposed topology.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2022)
Article
Engineering, Electrical & Electronic
Jing Sheng, Cong Chen, Rui Lu, Chushan Li, Xin Xiang, Wuhua Li, Xiangning He
Summary: This article studies the output voltage control strategy of modular multilevel resonant dc converters (MMRDC) for medium-voltage wide-input-range applications. The feasibility and influence of switching frequency regulation and modulation index regulation are investigated, and a design and control optimization method based on modulation index regulation and switching frequency regulation is proposed. Experimental validation shows that the optimized control methods are effective, with an efficiency over 96.4% under a wide input range.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2022)
Article
Engineering, Electrical & Electronic
Philippe A. Gray, Peter W. Lehn
Summary: The CS-MMC is a new type of modular multilevel dc-dc converter that uses voltage-source submodule cells and a current-source submodule, addressing limitations of previous continuous conduction mode operation. By operating in discontinuous conduction mode and using VSM capacitor voltage ripple to determine DCM, the efficiency of the converter is improved.
IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS
(2022)
Article
Engineering, Electrical & Electronic
Lingbo Zhou, Canfeng Chen, Jian Xiong, Kai Zhang
Summary: This article proposes a modified individual capacitor voltage balancing method for MMCs with phase-shifted carrier pulsewidth modulation (CPS-PWM) to solve the problem of poor dynamic performance at low output power. The proposed method incorporates the information of arm current into the balancing algorithm to cancel out the coupling effect of output power on balancing control, showing better robustness and dynamic performance.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2022)
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
Engineering, Electrical & Electronic
Yuxiao Zhang, Ke Dai, Hongwei Xu, Tianyi Liu, Haitao Lin, Ziwei Dai, Yong Kang
Summary: This article presents a 100-kHz sampling and switching frequency shunt active power filter (SAPF) based on a dual-core DSP, which utilizes multithreading and multiprocessing to speed up signal processing, achieve wider current control bandwidth, and broaden the spectrum of harmonic suppression. The proposed SAPF with a higher sampling frequency and multiresolution RDFT strategy can suppress wider frequency harmonics effectively, as verified by a prototype complying with IEEE standard 519-2014.
IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS
(2021)
Article
Engineering, Electrical & Electronic
Hanyu Wang, Xuejun Pei, Yuhuan Wu, Yong Kang
Summary: This article proposes a fault-tolerant method for switch faults in modular series-parallel dc-dc converters, which includes fast fault diagnosis and postfault reconfiguration. By adding a small auxiliary winding to each module, fast fault diagnosis is achieved without expensive sensors. A general low-cost hardware circuit is designed to locate faulty modules quickly, and a systematic reconfiguration process is presented for different structures, ensuring smooth hot swap with minimized impact on output and other healthy modules.
IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS
(2021)
Article
Energy & Fuels
Xuli Quan, Xinchun Lin, Yun Zheng, Yong Kang
Summary: This paper investigates the transient stability issues driven by the imbalance between input power and output power of the grid-connected converter (GCC) during the transient process. It is found that the transient stability issues still exist even if the effects of control loops are ignored. Moreover, it is suggested to set a maximum input power limit (MIPL) for GCC and use the imbalance power equation to determine the transient stability of GCC.
Article
Engineering, Electrical & Electronic
Han Peng, Hao Peng, Ziyue Dang, Yu Chen, Yong Kang, Xudan Liu, Maojun He
Summary: A novel time-segmented transient analysis approach is proposed in this article for improving resonant gate driver (RGD). The study indicates that RGD can achieve lower loss, faster speed, and better SiC switching characteristics compared to the conventional gate driver (CGD).
IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS
(2021)
Article
Engineering, Electrical & Electronic
Debin Zhang, Yu Chen, Jingyuan Su, Yong Kang
Summary: This article presents a unified control architecture for brushless doubly-fed induction generators (BDFIG) to operate in both standalone and grid-connected modes. By adding plug-in functional units, functions such as phase-lock, inrush current suppression, and active/reactive power regulation are achieved.
IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS
(2021)
Article
Automation & Control Systems
Gengzhe Zheng, Yu Chen, Yong Kang
Summary: This article proposes a solid-state transformer (SST) topology based on a modular multilevel converter (MMC) for simplifying energy conversion process and increasing power density. The integration of medium frequency (MF) transformer and mixed-frequency modulation have been demonstrated through simulation and experiments to validate the effectiveness of the proposed topology.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2021)
Article
Engineering, Electrical & Electronic
Yu Chen, Weikang Qiu, Xinmin Liu, Yong Kang
Summary: This article proposes a control framework that protects networked converters from cyberattacks by physically isolating the digital model predictive controller from the control loop. It also demonstrates excellent dynamic performance and zero steady-state error under normal conditions.
IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS
(2022)
Article
Engineering, Electrical & Electronic
Zhipeng Cheng, Han Peng, Jimin Chen, Yong Kang, Jinglin Wu, Xu Chu
Summary: This article proposes a new design methodology for resonant tanks in LCC converters, aiming to improve efficiency and design feasibility by considering voltage and current stress. The proposed tank switch approaches, such as C-s-Switch, L-s-Switch, and L-Parallel, effectively limit the switching frequency range. The results showed that the L-s-Switch approach achieved the desired gain range with the smallest switching frequency range, moderate voltage stress, and smallest current stress. The proposed methodologies are verified through the construction of a 5 kW LCC converter.
IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS
(2022)
Article
Engineering, Electrical & Electronic
Yi Zhang, Cai Chen, Yue Xie, Teng Liu, Yong Kang, Han Peng
Summary: This article proposes a high-efficiency adaptive method for dynamically adjusting the dead time of GaN inverters to accommodate different operating conditions. The improved model allows for accurate dead time adjustment without the need for additional sensors. Experimental results demonstrate that the dynamic adjustment method significantly reduces power loss.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2022)
Article
Engineering, Electrical & Electronic
Zhiwei Wang, Zongheng Wu, Teng Liu, Cai Chen, Yong Kang
Summary: This article proposes a bipolar symmetric phase shift modulation strategy to reduce the resonant inductance and correct resonant current with high power density and high efficiency in an integrated two-stage buck-boost-LLC isolated dc-dc converter. Additionally, the LLC stage is improved by decreasing the RMS current of primary switches using the choke inductor current. The experimental results show that the proposed modulation strategy effectively corrects resonant current, improving efficiency and power density.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2022)
Article
Engineering, Electrical & Electronic
Qing-Xin Guan, Yu Zhang, Huan-Bei Zhao, Yong Kang
Summary: This article studies a dual active bridge based on the active neutral-point-clamped (ANPC) three-level circuit and analyzes its soft-switching characteristics. It proposes an optimized switching strategy to balance the loss distribution of power devices, and verifies its effectiveness through experiments.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2022)
Article
Engineering, Multidisciplinary
Hongcheng Yang, Yu Chen, Yi Shang, Changqi Yu, Yong Kang
Summary: With the widespread use of power electronic converters, abnormal temperature of converter components is the most important factor in converter failure. In order to improve the reliability of converter design, it is necessary to monitor the temperature of key components in the converter during the prototype test stage. This paper proposes a fully automatic temperature monitoring method for converter components based on a deep learning object detection algorithm, which can accurately monitor the component temperature and facilitate converter state monitoring and fault detection.
IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS
(2023)
Article
Engineering, Electrical & Electronic
Yu Chen, Jingbo Bai, Yong Kang
Summary: In this article, a topology deduction method based on reinforcement learning (RL) is proposed to design single-inductor multiport converters. The method utilizes a neural network for forward design and simple rules for reverse design, resulting in simplified design process, meeting prior constraints, and providing diverse deduction results.
IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS
(2022)
Article
Engineering, Electrical & Electronic
Caifeng Liu, Shuang Liu, Yu Chen, Xudong Zou, Yong Kang
Summary: This paper proposes a hybrid-type dual active bridge topology for ultrawide input voltage, which uses a dc blocking capacitor to expand the gain range and can operate in single-stage or two-stage mode. A control strategy is also designed to optimize the operation boundary of the optimal modes. The proposed methodology avoids additional loss and efficiency dip at nonoptimal voltage matching points. Experimental results verify the performance of the proposed scheme.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2023)
