Article
Engineering, Electrical & Electronic
Decun Niu, Feng Gao, Tao Xu, Zhan Ma
Summary: This article proposes a thyristor-based T-type converter with modular multilevel dc-link, which can be used as a medium-/high-voltage static synchronous compensator and achieve capacitor voltage balancing under various operation conditions.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2022)
Article
Engineering, Electrical & Electronic
Ngoc Dat Dao, Hoang Vu Nguyen, Dong-Choon Lee
Summary: This article introduces a novel semimodular three-phase ac/dc structure for modular solid-state transformers, which employs single-stage indirect matrix-based ac/dc converters to significantly reduce the number of semiconductor devices in the system. A decentralized control scheme and a 360-kW system design have been developed to evaluate the efficiency and performance of the proposed system.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2022)
Article
Computer Science, Information Systems
Manuel A. Barrios, Victor Cardenas, Jose M. Sandoval, Josep M. Guerrero, Juan C. Vasquez
Summary: The paper proposed a three-phase cascaded DC-AC-AC converter with AC-link for medium-voltage applications, which includes MF square voltage generator, MF transformer, and AC-AC converter, aiming to avoid per-phase imbalance and simplify the control process. Simulations were conducted to verify the converter's operation, and two reduced preliminary laboratory prototypes were presented to validate the cascaded and three-phase configurations.
Article
Engineering, Electrical & Electronic
Yuzhuo Pan, Jiaxun Teng, Zemin Bu, Jiang Wang, Chen Yang, Xin Li, Xiaofeng Sun
Summary: This article proposes a cascaded modular isolated back-to-back solid-state transformer (CMIB-SST) for electrical isolated interconnection of two distribution ac grids. The proposed CMIB-SST effectively reduces the low-frequency voltage ripple of submodule (SM) and is cost-friendly by using film capacitors instead of electrolytic capacitors. The voltage gain and mathematical model of the proposed SST are analyzed, and the corresponding transformer design is carried out under various constraints. The scheme is evaluated by cost and volume, and is verified through simulation and experimental results.
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
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
Zhendong Ji, Jintao Zhang, Dongye Li, Yichao Sun, Jianhua Wang, Jianfeng Zhao
Summary: This study proposes a fast pre-charging strategy for modular multilevel DC transformers (MMDCTs), which achieves simultaneous charging of the primary and secondary sides by using compound frequency control. The contradiction between charging speed and inrush current is resolved through independent control of the direct current component and intermediate frequency component. The effectiveness and feasibility of the proposed strategy are verified through simulations and experiments.
Article
Engineering, Electrical & Electronic
Sandro P. Martin, Xiaofeng Dong, Hui Li
Summary: In this article, a dynamic model is developed for a low-inertia dc solid-state transformer (SST) and predictive control and feedforward current control are designed for fast dynamic control and suppression of steady-state harmonics. The developed model and controllers are validated through simulation and experimental results.
IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS
(2022)
Article
Engineering, Multidisciplinary
Andre Elias Lucena da Costa, Cursino Brandao Jacobina, Nady Rocha, Phelipe Leal Serafim Rodrigues
Summary: The article introduces a new five-leg multilevel converter with varied output voltages achieved by using a transformer, which was validated through simulated and experimental results.
IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS
(2021)
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
Ehsan Afshari, Mahshid Amirabadi
Summary: The article introduces a modular converter with stackable cells, which does not require electrolytic capacitors for power conversion, enhancing reliability and maintenance. The design also allows for scalability and modularity.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2021)
Article
Energy & Fuels
Zhendong Ji, Rui Rao, Qiantong Wang, Dongye Li, Yichao Sun, Jianhua Wang, Jianfeng Zhao
Summary: A soft-starting scheme for MMC-DCSSTs has been designed in this study to limit the large inrush and magnetizing currents before the system reaches the normal operation stage by dividing it into primary-side and secondary-side charging stages. The effectiveness of the proposed method is experimentally validated, and the reliability of MMC-DCSSTs can be improved with controllable currents.
Review
Multidisciplinary Sciences
Abdur Rehman, Malik Imran-Daud, Syed Kamran Haider, Ateeq Ur Rehman, Muhammad Shafiq, Elsayed Tag Eldin
Summary: This paper presents a systematic evaluation of the development of AC-AC conversion technology and its importance for the advancement of Solid State Transformers in distribution systems. It discusses various SST designs and technologies, as well as their potential applications in the power grid.
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
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
Energy & Fuels
Chuang Liu, Xuejiao Li, Yuemei Zhi, Guowei Cai
Article
Thermodynamics
Yibo Wang, Xinyao Shao, Chuang Liu, Guowei Cai, Lei Kou, Zhiqiang Wu
Article
Engineering, Electrical & Electronic
Chuang Liu, Dongbo Guo, Renzhong Shan, Guowei Cai, Weichun Ge, Zhezhu Huang, Yibo Wang, Hanwen Zhang, Peng Wang
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2019)
Article
Engineering, Electrical & Electronic
Yibo Wang, Peng Wang, Guowei Cai, Chuang Liu, Dongbo Guo, Hanwen Zhang, Bingda Zhu
Summary: This article introduces a novel single-phase pulsewidth modulation (PWM) direct ac-ac converter based on two-level nondifferential dual-buck AC chopper legs. The converter is capable of addressing voltage sag and swell issues while improving system reliability compared to traditional converters.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2021)
Article
Engineering, Electrical & Electronic
Dongfeng Yang, Haoran Zhang, Chuang Liu, Zhongchen Pei, Lin Lin, Xiaomin Song
Summary: This study proposes a novel photovoltaic inverter topology based on multibus DC collection that achieves isolated cascade configuration, reducing system volume and eliminating voltage-balancing control. The effectiveness of this topology was confirmed through simulation and experimental results.
IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS
(2021)
Article
Engineering, Electrical & Electronic
Rutian Wang, Lan Ai, Chuang Liu
Summary: A novel topology of a three-phase dual-output neutral-point-clamped three-level inverter (DO-NPC-TLI) is proposed in this paper, which can achieve two groups of AC voltage outputs with adjustable frequency and amplitude. The topology is based on a neutral-point-clamped three-level inverter and adds eight switches and six clamping diodes to form the new topology. A modulation strategy combining time-sharing modulation and VSVPWM is proposed to simplify the complicated calculation process, and the effectiveness of the modulation strategy and feasibility of the proposed topology is verified through experiments.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2021)
Article
Engineering, Electrical & Electronic
Chuang Liu, Kehao Zhuang, Zhongchen Pei, Di Zhu, Xuejiao Li, Qinhai Yu, Huanhai Xin
Summary: Based on the concept of partial power conversion, this article proposes a hybrid silicon carbide-silicon DC-AC topology to improve performance in high power applications. By connecting SiC-MOSFET in series with a silicon IGBT working at low frequency, and using hybrid modulation strategy and quasi-proportional-resonance control, the performance of the proposed topology is verified through simulation and experimentation.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2022)
Article
Engineering, Electrical & Electronic
Bingda Zhu, Chuang Liu, Mengxue Shen, Guowei Cai, Xiaochun Mu, Xiaohong Wang, Dongbo Guo, Hanwen Zhang, Haonan Chen
Summary: This article introduces a flexible ac-link converter based on direct acx2013;ac choppers (FACL), which is expected to achieve voltage compensation and power flow control. The power conversion principle of FACL is analyzed and a high-performance bipolar FACL is proposed. A variant of the conventional dq reference frame called DQ-ABC synchronous rotating reference frame (DSRRF) is adopted for control convenience, and a closed-loop control strategy is designed. Experimental tests are carried out to verify the theoretical analysis.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2022)
Article
Engineering, Electrical & Electronic
Chuang Liu, Yu Jiang, Zhongchen Pei, Mengxue Shen, Guowei Cai, Xiaomin Song, Di Zhu, Jingyue Wang, Hui Li, Dongbo Guo, Qinhai Yu
Summary: This article proposes a novel single-stage bidirectional isolated dc-ac converter based on an inversely coupled inductor, which is feasible to be used in cascaded dc-ac solid-state transformer topologies. By employing an inversely coupled inductor, the steady-state and transient performance of the converter can be improved, and the volume and number of magnetic components can be reduced.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2022)
Article
Engineering, Electrical & Electronic
Bingda Zhu, Chuang Liu, Dongbo Guo, Lingguo Kong, Guowei Cai, Heyang Sun, Xinming Shao
Summary: This article proposes an arbitrary two-phase input voltages based ac voltage synthesis method for direct ac-ac power conversion. The current harmonics generated can be eliminated naturally through the phases' cross-coupling. The experimental results validate the theoretical analysis.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2022)
Article
Engineering, Electrical & Electronic
Rutian Wang, Shuai Yuan, Chuang Liu, Dongbo Guo, Xinming Shao
Summary: A novel three-phase dual-output T-type three-level converter (DO-T-TLC) topology with dc-link and two sets of three-phase ac voltage output terminals is proposed in this article. The operating principle and available switching states of the converter are discussed, along with a detailed analysis of the phase disposition pulsewidth modulation scheme with dc offsets. Additionally, a method to balance capacitor voltages in the dc-link is proposed and its effectiveness is evaluated through experimental results.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Dongbo Guo, Tianpeng Du, Chuang Liu, Pinjia Zhang, Zhongchen Pei, Guanyu Yan, Guowei Cai, Yibo Wang, Rutian Wang
Summary: This article proposes a single-phase bipolar pulsewidth modulation direct ac-ac converter with unipolar modulation strategy. The converter consists of two odd symmetrical two-level no-differential ac chopper legs, which can operate in noninverting and inverting modes for voltage sag or swell compensation. The proposed unipolar modulation strategy minimizes the number of high-frequency switches in each operating mode, effectively reducing total switching losses and improving converter efficiency. Additionally, the converter achieves capacitor symmetry in the positive and negative half cycles of the input voltage, eliminating commutation problems. Experimental results under different working conditions are provided to confirm the correctness of the theoretical analysis and the superiority of the proposed topology and modulation strategy.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2023)
Article
Computer Science, Information Systems
Rutian Wang, Chaochao Li, Chuang Liu, Chongyi Lu, Weiquan Wang
Article
Computer Science, Information Systems
Chuang Liu, Dehao Kong, Zhenbin Zhang, Zhongchen Pei, Ralph Kennel
