Results 41 to 50 of about 2,650,426 (86)

A Low‐Frequency Transformer Protection Method Based on Excitation Inductance Parameter Identification

IET Electric Power Applications, Volume 19, Issue 1, January/December 2025.
In this paper, we propose a method to effectively identify faults and excitation inrush currents in the area by using the characteristics of instantaneous excitation inductance, so as to improve the reliability and accuracy of low‐frequency transformer protection in offshore wind power low‐frequency transmission system.
Shuping Gao, Zhe Quan, Xinyu Wu, Chenqing Wang, Shi Chen, Yaming Ge, Xiangping Kong   +6 more
wiley   +1 more source

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

Energy balancing of the Modular Multilevel Matrix Converter based on a new transformed arm power analysis [PDF]

, 2014
This paper presents a transformed arm power analysis of the Modular Multilevel Matrix Converter (M3C). It enables the energy balancing in the whole frequency range for high power variable-speed drive applications. Four balancing directions are identified
Felix Kammerer, Kammerer, Felix, Michael Braun, Kolb, Johannes, Johannes Kolb, Gommeringer, Mario, Braun, Michael, Mario Gommeringer   +7 more
core   +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

Overload Capability of the Modular Multilevel Matrix Converter for Feeding High Torque Low Speed Drives [PDF]

, 2014
In drive systems, the semiconductors of conventional converters must be dimensioned for the maximum torque. This results in a converter oversizing even for short time overload requirements near standstill, e.g. for mills in the mining industry.
Kammerer, Felix, Kolb, Johannes, Gommeringer, Mario, Braun, Michael   +3 more
core   +1 more source

Control of a Double Fed Induction Generator based Wind Energy Conversion System equipped with a Modular Multilevel Matrix Converter

, 2019
During the last years, the Modular Multilevel Matrix Converter (M3C) has been investigated due to its capacity tooperate in high voltage and power levels.
Espinoza Bolaños, Mauricio, Cárdenas Dobson, Jesús Roberto Pedro Alejandro, Díaz Díaz, Matías, Melendez, Carlos, Rojas Lobos, Félix Eduardo, Felix Rojas, Carlos Melendez, Roberto Cardenas, Matias Diaz, Mauricio Espinoza   +9 more
core   +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

Harmonic analysis of modular multilevel matrix converter for fractional frequency transmission system [PDF]

, 2019
Fractional Frequency Transmission is a competitive technology for offshore wind power transmission. Modular Multilevel Matrix Converter (M3C) plays a key role in a Fractional Frequency Transmission System (FFTS) as the frequency changer.
Zhang, Xiao-Ping; id_orcid, Gu, Kanghui, Luo, Jiajie, Xue, Ying; id_orcid   +3 more
core   +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