Results 31 to 40 of about 63 (56)

Adaptability Analysis and Improvement of Traditional Transformer Protection in Offshore Low‐Frequency Wind Power System

IET Generation, Transmission &Distribution, Volume 19, Issue 1, January/December 2025.
In this paper, a zero‐sequence differential protection based on phase difference is proposed for the internal grounding fault of the transformer, which has strong anti‐excitation inrush current interference, and the protection criterion is the self‐generated ze‐ro‐sequence current and the neutral zero‐sequence current on the high‐voltage side of the ...
Chenqing Wang, Shi Chen, Xinyu Wu, Yaming Ge, Xiangping Kong, Shuping Gao, Jinyu Zhou   +6 more
wiley   +1 more source

Fault ride-through coordinated control strategy for offshore wind power via flexible low-frequency transmission system

电力工程技术
The offshore wind power via flexible low-frequency transmission (FLFT) system based on the modular multilevel matrix converter (M3C) faces power surplus and stability risks following faults on the power frequency grid side.
Nianwen XIANG, Hailong CHENG, Shouhong YE, Bingbing SHAO, Shulai WANG, Yi LU   +5 more
doaj   +1 more source

Fully Decoupled Branch Energy Balancing Control Method for Modular Multilevel Matrix Converter Based on Sequence Circulating Components

CSEE Journal of Power and Energy Systems
The modular multilevel matrix converter (M3C) is a potential frequency converter for low-frequency AC transmission. However, capacitor voltage control of high-voltage and large-capacity M3C is more difficult, especially for voltage balancing between ...
Zexin Zhao, Weijiang Chen, Zhichang Yang, Guoliang Zhao, Bin Han, Yunfei Xu, Nianwen Xiang, Shulai Wang   +7 more
doaj   +1 more source

A Low Inrush Current Pre-Charging Strategy of M3C with Improved Nearest Level Modulation

Energies
The modular multilevel matrix converter (M3C) can perform AC/AC conversion directly. However, M3C operation often requires a pre-charging process, which can be challenging due to the need for fast pre-charging with low inrush current.
Rufei He, Yikai Li, Yumin Peng, Yiming Ma, Fanqi Huang, Hailong Li, Wei Luo   +6 more
doaj   +1 more source

Circulating Current Suppression Strategy of Modular Multilevel Matrix Converter Based on Quasi-Proportional Resonant Control

Shanghai Jiaotong Daxue xuebao
Modular multilevel matrix converter (M3C) is the core device of the fractional frequency transmission system. Due to the lack of direct current link, the electrical quantities of different frequencies are directly coupled inside the M3C, resulting in a ...
JIANG Yafeng, LI Yibo, WU Qiuwei, LIU Shenquan, WU Xiaodan, ZHOU Qian
doaj   +1 more source

Control Strategy for Improving Active Frequency Support Capability of Offshore Wind Farm

Shanghai Jiaotong Daxue xuebao
In low frequency alternating current (AC) transmission systems, offshore wind farm is unable to respond to changes in onshore grid frequency in a timely manner due to frequency decoupling and signal transmission delays between the offshore wind power ...
LI Yibo, ZHOU Qian, ZHU Dandan, JIANG Yafeng, WU Qiuwei, CHEN Jian
doaj   +1 more source

Adaptive current control strategy for M3Cs using PSO-RBFNN-Tuned LADRC in fractional frequency transmission systems

International Journal of Electrical Power & Energy Systems
The Modular Multilevel Matrix Converter (M3C) has emerged as a promising solution for high-power fractional frequency transmission systems (FFTS), offering superior modularity and flexible control capabilities. However, conventional proportional-integral
Wei Luo, Yuchen Ma, Zhe Li, Yunqiao Shen
doaj   +1 more source

Power balancing strategy for M3C arm power in interconnected partitioned grids based on third-harmonic injection

Zhejiang dianli
In application scenarios such as the interconnection of partitioned power grids where the input and output frequencies of the modular multilevel matrix converter （M3C） are identical， the coupling between the voltages and currents on both sides introduces
ZHOU Yuyan, LIU Shenquan, JIANG Shaoyan, QIN Jinyu, WANG Gang   +4 more
doaj   +1 more source

Influence of low-frequency transmission system control on differential protection and optimization strategy

电力工程技术
As a fault occurs on lines of a two-terminal low-frequency transmission system, fault currents will be suppressed when frequency converters adopt negative sequence current suppression strategy.
Yangang SHI, Haiyong ZHU, Liwen LU, Yi LU, Defeng QIU, Yizhe LIN   +5 more
doaj   +1 more source

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Research on low frequency side short circuit fault of low frequency AC transmission (LFAC) system based on modular multilevel matrix converter (M3C)

IET Conference Proceedings, 2022
openaire   +3 more sources