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
Araz Saleki, Mohammad Tavakoli Bina, Amir Shahirinia
Summary: This paper proposes a new hybrid MMC protective topology consisting of a combination of the HB and TQB modules, which has low power losses and high fault ride-through capability.
IEEE TRANSACTIONS ON POWER DELIVERY
(2022)
Article
Engineering, Electrical & Electronic
Shuxin Zhang, Binbin Li, Da Cheng, Xiaodong Zhao, Gen Li, Wei Wang, Dianguo Xu
Summary: The article introduces a hybrid topology of a monopolar symmetrical dc/dc converter with features of low cost, high efficiency, small footprint, and bidirectional power transfer capability. Experimental results verify its performance and effectiveness.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2021)
Article
Engineering, Electrical & Electronic
Zhengxuan Li, Qiang Song, Shukai Xu, Biao Zhao, Zhanqing Yu, Rong Zeng
Summary: An approximate analysis method is proposed for the energy storage requirement in MMC with variable dc voltages. The optimal circulating current and practical curve-fitting approach are utilized to achieve low-energy storage requirements. The simulation and experimental results validate the analysis.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2022)
Article
Engineering, Electrical & Electronic
Futian Qin, Feng Gao, Yi Tang, Tao Xu, Jinyu Wang, Decun Niu
Summary: This article introduces a new nine-arm modular multilevel converter with improved hybrid submodules for middle arms, which can reduce the dc-side voltage, eliminate the dc offset in common mode voltages, and provides a control method for middle arm current. The feasibility and performance characteristics of the proposed 9A-MMC were verified through simulation and experimental results.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2021)
Article
Automation & Control Systems
Vinicius A. Lacerda, Renato M. Monaro, Rafael Pena-Alzola, David Campos-Gaona, Denis Coury
Summary: A new distance protection algorithm for HVdc grids is proposed in this article, which identifies the faulty line/cable by using the resonance frequency of a dc capacitor installed in each terminal. The algorithm showed high selectivity for line faults and provided fast identification in hardware testing, even under high-noise conditions.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2022)
Article
Engineering, Electrical & Electronic
Prescott H. McLaughlin, Jan S. Rentmeister, M. Hassan Kiani, Jason T. Stauth
Summary: This article explores the merits of a variety of hybrid resonant switched-capacitor (SC) dc-dc converters under strict size constraints on passive components, comparing topologies using a minimum power loss figure of merit. The impact of area or volume constraints on inductors and capacitors is demonstrated. Common topologies are compared using the generalized FOM under different scaling scenarios and validated using an experimental prototype.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2021)
Article
Computer Science, Information Systems
Mohamed Ashraf, Yousef Nazih, Fahad Alsokhiry, Khaled H. Ahmed, Ayman S. Abdel-Khalik, Yusuf Al-Turki
Summary: This paper introduces a new modular multilevel converter (MMC) based front-to-front DC-DC converter to interconnect two different types of HVDC networks, providing uninterrupted bi-directional power flow, DC fault blocking capability, and low number of semiconductors. The paper also proposes and compares two active power control methodologies, as well as providing losses analysis and comparison between the two control techniques. Control-Hardware-in-the-Loop (CHiL) test validation is employed to confirm the validity of the proposed system under various scenarios.
Article
Energy & Fuels
Yang Liu, Zehui Lin, Kaishun Xiahou, Yuqing Lin, Q. H. Wu
Summary: This paper introduces an equivalent Hamiltonian equations model for MMC-HVDC transmission systems and constructs an energy function for multi-machine power systems. The model is verified to accurately track the power output dynamics of the full MMC-HVDC transmission system. The theoretical and numerical studies confirm the validity of the proposed energy function for hybrid AC/DC systems, bridging the gap between transient stability analysis methods and power systems with MMC-HVDC transmission lines.
CSEE JOURNAL OF POWER AND ENERGY SYSTEMS
(2021)
Article
Engineering, Electrical & Electronic
Vasileios Psaras, Dimitrios Vozikis, Grain P. Adam, Graeme Burt
Summary: This article investigates the enhanced dc fault performance of the customized hybrid modular multilevel converter (CH-MMC) and proposes a dedicated dc fault handling strategy for CH-MMC-based HVdc grids to improve fault resiliency and security under different fault conditions.
IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS
(2021)
Article
Energy & Fuels
Feng Xu, Xiaoming Huang, Yi Lu, Peng Qiu, Chengyu Lu, Chao Ding
Summary: This paper introduces a hybrid DC system called LCC-HY-MMC, proposes a complete shutdown control strategy for the shutdown stage, and verifies the effectiveness of the method through a digital simulation model.
Article
Engineering, Electrical & Electronic
Vaibhav Nougain, Sukumar Mishra, George S. Misyris, Spyros Chatzivasileiadis
Summary: The proposed work focuses on the identification of DC faults in multiterminal MMC-HVDC systems, specifically addressing selectivity issues and fault classification. Modal transformation and sensitivity functions are used to analyze and identify possible fault scenarios in the system.
IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS
(2021)
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
Engineering, Electrical & Electronic
Ahmed A. Aboushady, Khaled H. Ahmed, Ibrahim Abdelsalam
Summary: This article introduces a modified version of DC/DC converter with AC link capacitors to generate reactive power for improving efficiency by mitigating current stresses and losses. The proposed topology enables connectivity during power reversal and is analyzed and verified through simulations under adverse conditions like power reversal and DC fault. A low-scale prototype validates the theoretical analysis and simulation results.
IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS
(2021)
Article
Automation & Control Systems
Leonardo Gobel Fernandes, Alceu Andre Badin, Daniel Flores Cortez, Roger Gules, Eduardo Felix Ribeiro Romaneli, Amauri Assef
Summary: This article proposes a single-phase transformerless online UPS based on new technology, which operates efficiently with ac and dc input sources through switched capacitor operation. It improves power factor, balances dc bus capacitor voltages, and eliminates common mode current, reducing electromagnetic interference issues. Experimental results from a 2.5-kW prototype verify the feasibility with an efficiency of up to 94.9% and unity power factor.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2021)