Results 11 to 20 of about 1,722,896 (320)

An Improved Modulation Method for Parallel Three-Level Rectifiers With Circulating Current Mitigation

IEEE Access, 2023
An improved modulation method is proposed for two parallel three-level interleaved rectifiers to reduce current harmonics and high-frequency zero-sequence circulating current, which uses sinusoidal pulse width modulation.
Yanfeng Li, Hongliang Zhang, Xiao Jing, Aiguang Zhao   +3 more
doaj   +1 more source

Zero-Sequence Differential Current Protection Scheme for Converter Transformer Based on Waveform Correlation Analysis

Energies, 2020
Through the analysis of the recovery inrush current generated by the external fault removal of the converter transformer, it is pointed out that the zero-sequence current caused by the recovery inrush may result in the saturation of the neutral current ...
Tao Zheng, Xinhui Yang, Xingchao Guo, Xingguo Wang, Chengqi Zhang   +4 more
doaj   +1 more source

Three‐phase isolated power transformer based novel structure for power distribution system and new theoretical/practical judgement criteria in detecting high‐impedance earth faults

IET Renewable Power Generation, 2023
Single phase‐earth faults are the most frequent faults likely to occur but hard to identify in distribution system, especially in a neutral un‐effectively grounded system.
Hua Zhang, Xueneng Su, Longjiang Li, Xin Ning, Rui Zhang, Cheng Long, Shilong Li, Yiwen Gao   +7 more
doaj   +1 more source

Network-centric technologies for control of three-phase network operation modes [PDF]

, 2017
Purpose. The development of the control system for three-phase network is based on intelligent technologies of network-centric control of heterogeneous objects.
Gapon, D. A., Gryb, O. G., Iierusalimova, T. S., Shvets, S. V., Sirotin, Yu. A., Sokol, Y. I.   +5 more
core   +7 more sources

Analytical Optimal Currents for Multiphase PMSMs Under Fault Conditions and Saturation [PDF]

, 2014
An original analytical expression is presented in this paper to obtain optimal currents minimizing the copper losses of a multi-phase Permanent Magnet Synchronous Motor (PMSM) under fault conditions.
FLIELLER, Damien, KESTELYN, Xavier, NGUYEN, Ngac Ky, SEMAIL, Eric   +3 more
core   +5 more sources

Frequency Response Testing of Zero-Sequence Current Transformers for Mining Ground Fault Protection Relays [PDF]

International Journal of Electronics and Telecommunications, 2020
In Polish coal mining, medium voltage power distribution networks operate with an insulated neutral point. Zero-sequence current transformers are the basic sensors that generate input signals for earth-fault protection relays.
Krzysztof Kuliński, Adam Heyduk
doaj   +1 more source

Analysis and Suppression of Zero Sequence Circulating Current in Open Winding PMSM Drives With Common DC Bus [PDF]

, 2017
In this paper, the zero sequence circulating current in open winding permanent magnet synchronous machine (OW-PMSM) drives with common dc bus is systematically analyzed for the first time.
Odavic, M., Zhan, H., Zhu, Z.Q.
core   +1 more source

A Control Strategy for Suppressing Zero-Sequence Circulating Current in Paralleled Three-Phase Voltage-Source PWM Converters

Applied Sciences, 2020
In microgrids, paralleled converters can increase the system capacity and conversion efficiency but also generate zero-sequence circulating current, which will distort the AC-side current and increase power losses.
Zhao Han, Xiaoli Wang, Baochen Jiang, Jingru Chen   +3 more
doaj   +1 more source

Improvement of single-phase grounding fault detection for small resistance grounding systems based on steady-state monitoring information in the substation

Zhejiang dianli, 2023
In order to use the existing hardware sources to improve the line selection performance of single-phase grounding fault of small resistance grounding systems， a method for line selection of single-phase grounding fault based on the global steady-state ...
LIU Jian, ZHU Qingsong, WANG Yizhao, ZHANG Zhihua, CHEN Jieyu   +4 more
doaj   +1 more source

Pilot Protection Based on Zero-Sequence Current Resistance-Capacitance Component for Large-Scale Inverter-Interfaced Power Stations

Sustainability, 2022
At present, zero-sequence current protection is generally used as the main protection for single-phase ground faults in resistance-grounded inverter power stations.
Qian He, Gong He, Zheng Li, Meichen Lin, Gexiang Zhang, Xuedong Li   +5 more
semanticscholar   +1 more source