Results 41 to 50 of about 984 (180)

Comparison of full power frequency converter topologies for large capacity variable speed pumped storage units

电力工程技术
Variable speed pumped storage units have obvious advantages in efficiency and adaptability under various operation conditions compared with traditional fixed-speed pumped storage units.
Bo ZHAO, Fengyuan TIAN, Qichao ZHANG, Kaiguo WANG, Hao LIANG, Jinwu GONG   +5 more
doaj   +1 more source

Reverse-blocking modular multilevel converter for battery energy storage systems

Journal of Modern Power Systems and Clean Energy, 2017
Energy storage systems with multilevel converters play an important role in modern electric power systems with large-scale renewable energy integration.
Xiaofeng YANG, Yao XUE, Bowei CHEN, Yajie MU, Zhiqin LIN, Trillion Q. ZHENG, Seiki IGARASHI   +6 more
doaj   +1 more source

Modulation, control, and performance analysis of asymmetric modular multilevel converter (A‐MMC)

IET Power Electronics, 2018
Modular multilevel converters (MMC) have proven to be a viable candidate for high‐voltage direct current transmission systems. Here, asymmetric modular multilevel converters (A‐MMC) are introduced wherein each series connected module has two half‐bridge (HB) submodules, with asymmetric voltage rating.
Kundan Srivastav, Ashish Kumar Sahoo, Kartik V. Iyer, Ned Mohan   +3 more
openaire   +1 more source

Hydrogels for Cancer Immunotherapy: Strategies From Construction to Application

MedComm, Volume 7, Issue 2, February 2026.
Hydrogels offer an innovative platform for cancer immunotherapy. Through tailorable crosslinking strategies, they form customizable drug delivery platforms that address diverse therapeutic requirements by loading specific immunotherapeutic agents. These systems demonstrate significant clinical potential for precise tumor immunotherapy.
Xiaohua Chen, Shan Wu, Yueyang Zhang, Lilu Feng, Yang Chen, Xuzhao Yang, Ke Men, Jiuqun Zhu, Ming Li   +8 more
wiley   +1 more source

Loss reduction analysis and control of AC-voltage-boosted FBSM MMC by injecting second harmonic circulating current

The Journal of Engineering, 2019
Reducing the power loss and handling short-circuit faults in HVDC systems are crucial for economical and reliable operation of modular multilevel converters (MMC). This paper proposes a loss reduction method for AC voltage-boosted FBSM-MMC by controlling
Muchao Xiang, Jiabing Hu, Zhiyuan He
doaj   +1 more source

A Hybrid Ultra‐High Voltage DC Transformer With Digital Twin‐Driven Operation and Control

Digital Twins and Applications, Volume 3, Issue 1, January/December 2026.
This study introduces a digital twin‐driven hybrid ultra‐high‐voltage DC transformer (UHVDCT) that combines high‐capacity LCCs with low‐capacity MMCs at the UHV side. This innovative topology reduces MMC requirements by 32.9% while ensuring stable power flow and dynamic reactive balance through real‐time virtual‐physical synchronization.
Ling Xu, Le Zhao, Xiaohu Zhang, Hanlin Guo, Jie Fang, Zheren Zhang, Zheng Xu   +6 more
wiley   +1 more source

Analysis and improvement of the reactive power cascade control strategy for MMC‐HVDC receiving‐end converter connected to weak grid

IET Generation, Transmission & Distribution
The weak AC grid in a modular multilevel converter modular multilevel converter based high voltage direct current (MMC‐HVDC) receiving‐end system requires faster reactive power support from the receiving‐end MMC.
Junhua Xu, Guopeng He, Yong Liu, Songqin Tang, Daiyu Xie, Mingyuan Chen   +5 more
doaj   +1 more source

Novel single‐armed modular multilevel converter for reducing total converter capacitance

IET Power Electronics, 2021
During normal operation of a conventional Modular Multilevel Converter (MMC), half of its capacitors remain bypassed at any time instant, increasing the total required capacitance for converter operation, and in turn leading to a larger size and volume ...
Hamed Pourgharibshahi, Seyyedmahdi Jafarishiadeh, Hamid Mahmoudi, Hassan Zargarzadeh, Reza Ahmadi   +4 more
doaj   +1 more source

A Novel Negative‐Sequence Compensation Method for Electrified Railway Traction Power Supply Systems Based on Dual Rotary Phase Shifting Transformers

IET Electric Power Applications, Volume 20, Issue 1, January/December 2026.
This article proposes a novel electromagnetic rotary negative‐sequence compensator based on dual rotary phase‐shifting transformers to mitigate negative‐sequence currents in single‐phase traction power supply systems. The topology, mathematical model and coordinated speed control strategy are established, with sequence characteristics analysis ...
Xiangwu Yan, Xingping Yi, Jiaoxin Jia, Tianze Zhen, Jiahao Yu, Bingzhen Li   +5 more
wiley   +1 more source

Recent Advances in Hybrid, Plug‐In, Battery, and Fuel Cell EVs: Control Schemes, Modes, Converter Topologies, and Pros and Cons

IET Electrical Systems in Transportation, Volume 2026, Issue 1, 2026.
Direct current (DC)–DC converters are the backbone of electric vehicle (EV) power trains, enabling efficient and bidirectional energy flow between the battery, high‐voltage (HV) DC link, and auxiliary rails under tight isolation, gain, ripple, and electromagnetic interference (EMI) constraints.
Abhilash Sakhare, Suresh Mikkili, Praveen Kumar Bonthagorla, Fabio Crescimbini   +3 more
wiley   +1 more source