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
Energy & Fuels
Guanlong Jia, Mingshuo Li, Binhao Shi, Xinchao Yu, Xiaoming Liu
Summary: This paper proposes an innovative high-frequency voltage injection method to reduce the voltage fluctuation in capacitor in variable speed drives and improve the performance of motors at low frequency. The feasibility and effectiveness of the proposed method are verified through simulation and experiment.
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
Yi Xu, Yi Zhang, Liang Qin, Kaipei Liu, Frede Blaabjerg
Summary: This paper proposes quantitative criteria to determine the necessity of considering the AC infeed in the fault current assessment. The criteria are established by a contributing ratio of the AC infeed over the total fault current and only rely on system and control parameters. The effectiveness of the proposed criteria is validated by case studies.
INTERNATIONAL JOURNAL OF ELECTRICAL POWER & ENERGY SYSTEMS
(2022)
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
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
Energy & Fuels
Shaoze Zhou, Binbin Li, Dianguo Xu, Gen Li
Summary: The modular multilevel converter (MMC) is a promising topology for medium-voltage drive applications. A hybrid MMC (HMMC) with a thyristor instead of IGBT as the DC-link switch is proposed to address the challenge of large cell capacitor voltage ripple. A new control scheme is proposed to ensure the safe operation of the thyristor and improve the reliability of HMMC. Experimental results validate the effectiveness of the proposed scheme for starting up a motor from standby mode to rated speed with full torque.
CSEE JOURNAL OF POWER AND ENERGY SYSTEMS
(2023)
Article
Engineering, Multidisciplinary
Shuvam Chakraborty, Suman Maiti
Summary: This article proposes a novel configuration combining a six-pulse thyristor-based controlled rectifier with a waveshaper-based MMC to address issues faced by conventional MMC in variable frequency induction motor drive applications.
IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS
(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
Automation & Control Systems
Philippe A. Gray, Peter W. Lehn, Netan Yakop
Summary: This article proposes a novel modular multilevel dc-dc converter with high power-density potential. It combines the advantages of modular multilevel converter (MMC) and flying capacitor converter. The converter features a new current source submodule (CSM) stage that reduces the string current and allows common grounding of the input source and output load. The article introduces the operating principles and the control design, and the laboratory-scale prototype achieves a peak efficiency of 97.1%.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2022)
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
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
Energy & Fuels
Qian Xiao, Yunfei Mu, Hongjie Jia, Yu Jin, Kai Hou, Xiaodan Yu, Remus Teodorescu, Josep M. Guerrero
Summary: This study proposes a four-terminal hybrid AC/DC microgrid interconnection scheme to meet DC transmission needs under different voltage levels. An improved energy control method is introduced to achieve DC capacitor voltage balancing control for stability and current symmetry in the microgrid. Validation results confirm the effectiveness of the proposed microgrid and control scheme.
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
Energy & Fuels
Cesar A. Arbugeri, Samir A. Mussa, Marcelo L. Heldwein
Summary: This article proposes the study, control, and analysis of the Hexverter, a AC-AC modular multilevel converter that offers attractive advantages in AC-AC applications. The article presents the operation principle, modeling, and control scheme, and validates the effectiveness of the operation and control through hardware-in-the-loop emulation.
Article
Automation & Control Systems
Sixing Du, Bin Wu, Navid R. Zargari
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2019)
Article
Engineering, Electrical & Electronic
Sixing Du, Bin Wu, Navid R. Zargari
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2019)
Article
Engineering, Electrical & Electronic
Qiang Wei, Ling Xing, Dewei Xu, Bin Wu, Navid R. Zargari
IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS
(2019)
Article
Engineering, Electrical & Electronic
Qiang Wei, Bin Wu, Dewei Xu, Navid R. Zargari
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2019)
Article
Engineering, Electrical & Electronic
Apparao Dekka, Bin Wu, Venkata Yaramasu, Ricardo Lizana Fuentes, Navid R. Zargari
IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS
(2019)
Article
Engineering, Electrical & Electronic
Cheng Xue, Li Ding, Yunwei Li, Navid Reza Zargari
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2020)
Article
Engineering, Multidisciplinary
Saeed Ouni, Mehdi Narimani, Zhongyuan Cheng, Navid R. Zargari
IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS
(2020)
Article
Automation & Control Systems
Li Ding, Yun Wei Li, Navid R. Zargari
Summary: This article proposes a sensorless control method for medium- and high-speed operation of a CSC-fed PMSM with low switching frequency. By adding a multi-loop controller with capacitor voltage control and a sliding mode observer strategy, the system performance and accuracy can be improved.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2021)
Article
Automation & Control Systems
Zhituo Ni, Ahmed Abuelnaga, Mehdi Narimani, Navid R. Zargari
Summary: This article proposes a closed-loop voltage ripple controller for regenerative CHB drives, which can reduce the dc-link capacitance.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2022)
Article
Automation & Control Systems
Zhituo Ni, Ahmed Abuelnaga, Shaoyi Yuan, Sarah Badawi, Mehdi Narimani, Zhongyuan Cheng, Navid Zargari
Summary: The diode-front-end cascaded H-bridge inverter has significant applications in the nonregenerative industry drive domain. However, the additional active-front-end rectifier introduces switching harmonics, which require grid interfaced filters to comply with harmonic standards. This article proposes an active filtering strategy based on an optimal asymmetric carrier-shifting method to reduce the required filter size and improve overall size, cost, and efficiency.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2022)
Article
Engineering, Electrical & Electronic
Zhituo Ni, Ahmed H. Abuelnaga, Sarah Badawi, Shaoyi Yuan, Mehdi Narimani, Ahmed Sayed-Ahmed, Zhongyuan Cheng, Navid R. Zargari
Summary: In conventional medium-voltage high-power cascaded H-bridge (CHB) drive, a three-phase rectifier is used in each power cell, limiting its application in regeneration capability. This article proposes a novel low-switching frequency control strategy for a regenerative CHB drive with low-voltage ride-through (LVRT) capability. The proposed control scheme integrates LVRT capability and reduces current sensor count, and can be extended to regenerative CHB drives with any voltage levels.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Sarah Badawi, Ahmed H. H. Abuelnaga, Zhituo Ni, Shaoyi Yuan, Mehdi Narimani, Zhongyuan Cheng, Navid R. R. Zargari
Summary: This article proposes a reduced switch-count topology for regenerative cascaded H-bridge (CHB) motor drives. It utilizes a four-switch three-phase inverter active front end to reduce the switch count, which resolves the issues of high switch count, switching power losses, and increased cost in traditional drives. The article also addresses challenges such as voltage imbalance and harmonics through phase alternation connection and carrier phase-shifting techniques. The proposed configuration and control techniques are analyzed theoretically, through simulation studies, and experimentally validated on a scaled-down seven-level regenerative CHB drive.
IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS
(2022)
Article
Engineering, Electrical & Electronic
Zhituo Ni, Ahmed H. Abuelnaga, Sarah Badawi, Shaoyi Yuan, Yue Pan, Mehdi Narimani, Zhongyuan Cheng, Navid R. Zargari
Summary: To handle high-power regeneration in coal and mine industry, a regenerative version of the cascaded H-bridge (CHB) drives is used with a three-phase IGBT-based active-front-end (AFE) rectifier replacing the diode-front-end rectifier. However, the IGBT switching devices introduce extra switching losses that need to be properly handled due to thermal constraints, so a novel switching frequency control strategy is proposed. This strategy allows for reshaping of the main harmonic contents generated by the AFEs at a low-order harmonics range, meeting the IEEE std 519-2014 at a fundamental switching frequency of 60. Furthermore, IGBTs can be turned off at zero current with the proposed switching pattern, reducing switching losses.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Ahmed H. Abuelnaga, Zhituo Ni, Sarah Badawi, Mehdi Narimani, Ahmed Sayed-Ahmed, Navid R. Zargari
Summary: This article proposes a new active-front-end (AFE) control method for regenerative cascaded H-bridge (CHB) motor drives to solve the regeneration issue. The integration of conventional AFEs to CHB converters is not optimal due to increased semiconductor losses and switching harmonics. To address these challenges, the article suggests a new AFE control based on fundamental frequency switching (FFE) to reduce power losses. The experimentally validated performance of the proposed control on a seven-level regenerative CHB drive is presented.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2023)
Review
Computer Science, Information Systems
Doho Kang, Sarah Badawi, Zhituo Ni, Ahmed H. Abuelnaga, Mehdi Narimani, Navid R. Zargari
Summary: The cascaded H-Bridge (CHB) topology is attractive for high-power medium-voltage motor drive applications due to its modularity and scalability. Different power cell designs have been introduced to reduce switch count and address the challenges of increased size and cost in regenerative CHB motor drives.
