Results 11 to 20 of about 47,412 (264)

Deadbeat Predictive Current Control for Series-Winding PMSM Drive with Half-Bridge Power Module-Based Inverter

Energies, 2021
Series-winding topology (SWT) could improve the DC-link voltage utilization, as open-winding topology does. Meanwhile, it can greatly reduce the number of power devices. Firstly, for the half-bridge power modules (HBPMs)-based inverter, an N-phase series-
Zhiping Dong, Chunhua Liu, Senyi Liu, Zaixin Song   +3 more
doaj   +1 more source

IEC 61850-Based Centralized Protection against Single Line-To-Ground Faults in Ungrounded Distribution Systems

Energies, 2021
We developed an International Electrotechnical Commission (IEC) 61850-based centralized protection scheme to prevent single line-to-ground (SLG) faults in the feeders and busbars of ungrounded distribution systems.
Soon-Ryul Nam, Woong-Hie Ko, Sopheap Key, Sang-Hee Kang, Nam-Ho Lee   +4 more
doaj   +1 more source

An individual sequencing control strategy for three-phase four-leg inverter under unbalanced loads

Energy Reports, 2023
Under the influence of the unbalanced load, the negative and zero sequence components in the output voltage of the three-phase four-leg voltage source inverter(TPFL-VSI) will cause asymmetry voltage.
Hanzhou Jiang, Huan Pan, Bin Shang
doaj   +1 more source

Principle of Flexible Ground-Fault Arc Suppression Device Based on Zero-Sequence Voltage Regulation

IEEE Access, 2021
Single-line-to-ground (SLG) fault arcs cause the intermittent over-voltages, leading to short circuits within large-scale area. In this paper, a flexible arc suppression device is proposed, which adopts a zigzag grounding transformer, multi-terminal ...
Bishuang Fan, Ganzhou Yao, Kun Yu, Xiangjun Zeng, Wen Wang, Chao Zhuo, Josep M. Guerrero   +6 more
doaj   +1 more source

Analysis of two-phase operation characteristics of a flexible low-frequency transmission system

Zhejiang dianli, 2022
The two-phase operation mode of a flexible low-frequency transmission system is based on the M3C （modular multilevel matrix converter）. This paper establishes a complex sequence network for the low-frequency system to analyze the steady-state operation ...
LU Yi, HUA Wen, JIN Yuqi, DONG Wei, NI Xiaojun, ZOU Qiang, WU Xiaodan   +6 more
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Power Control and Fault Ride-Through Capability Analysis of Cascaded Star-Connected SVG under Asymmetrical Voltage Conditions

Energies, 2019
The cascaded H-bridge static var generator (SVG) has been employed to provide reactive power and regulate grid voltages for many years because of its good modularity, easy scalability, and improved harmonic performance.
Muxuan Xiao, Feng Wang, Zhixing He, Honglin Ouyang, Renyifan Hao, Qianming Xu   +5 more
doaj   +1 more source

Sequence-current control strategies for transformerless voltage-source converters in islanded grids of AC/DC distribution system under asymmetrical ground faults

International Journal of Electrical Power & Energy Systems
Islanded grids play a crucial role in AC/DC distribution systems. The adoption of transformerless voltage-source converters as the primary power source is an important development direction for AC/DC distribution systems.
Yuze Li, Peng Guo, Qianming Xu, Josep M. Guerrero, Yufei Yue   +4 more
doaj   +1 more source

A Single-Phase-to-Ground Fault Detection Method Based on the Ratio Fluctuation Coefficient of the Zero-Sequence Current and Voltage Differential in a Distribution Network

IEEE Access, 2023
Because the traditional zero-sequence overcurrent protection method is not effective in detecting single-phase-to-ground faults (SPGF) in a low-resistance grounded system (LRGS), this paper analyzes the fault characteristics of a 10-kV LRGS in detail ...
Huamin Liang, Haifeng Li, Gang Wang
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Branch Voltage Balancing Control Strategy Based on the Transfer Power Model by Zero-Sequence Circulating Current for the Hexverter

IEEE Access, 2022
This paper proposes a novel branch voltage-balancing control strategy for a hexagonal converter (Hexverter). First, the state-space model based on the double-dq transformation is analyzed in-depth along with the necessary basic mathematical derivation ...
Yang Yi, Gang Yang, Chong Qian, Yaojie Gui   +3 more
doaj   +1 more source

High-impedance faulty feeder detection for cross-country faults in distribution networks based on zero-sequence active power regulation

International Journal of Electrical Power & Energy Systems
The weak characteristics of high-impedance faults and the complex attributes of cross-country faults make faulty feeder detection of cross-country high-impedance faults difficult in medium-voltage networks. This paper deduces the zero-sequence equivalent
Yuting Lan, Kun Yu, Xiangjun Zeng, Rong Cai, Qingbo Deng, Chenyu Wu, Shigeng He, Shijie Xu, Youcheng Jia   +8 more
doaj   +1 more source