Results 1 to 10 of about 2,775,940 (306)

Research on zero-sequence circulating current of bidirectional converters

机车电传动
The bidirectional converter device, featuring multiple converters in parallel on both AC and DC sides, employs carrier phase-shifting control. This approach can significantly enhance system capacity and reduce grid current harmonics; however, it also ...
YANG Jun, SONG Qianru, CHEN Guangzan, CHENG Zhenglin, WANG Xiong, YI Yunlan   +5 more
doaj   +2 more sources

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

Research of Fault Line Selection Method of Distribution Network Based on Transient Zero-sequence Energy

Gong-kuang zidonghua, 2012
For problem of ineffectiveness of traditional line selection methods by use of single feature value caused by complex and random fault borderline, small steady component of fault and reverse phase of instantaneous zero-sequence power when single-phase ...
TIAN Shu, HE Jin-peng, NIE He
doaj  

Research on single-phase grounding characteristics of low-resistance grounding systems with distributed generation

International Journal of Electrical Power & Energy Systems
The network-level characteristics of zero-sequence currents during single-phase ground faults in existing low-resistance grounding systems with inverter-interfaced distributed generators (IIDGs) remain unclear. Moreover, the influence of IIDG integration
Jianwen Zhao, Fuyang Zeng
doaj   +1 more source

Setting optimization of ground distance protection for multi-section hybrid transmission lines

Zhejiang dianli
To address the difficulty in simultaneously achieving reliability and sensitivity in the setting of ground distance protection for multi-section hybrid transmission lines due to the heterogeneity of individual line sections， an optimized setting method ...
WANG Yulong, DAI Guangwu, ZHAO Qingchun, XU Xiaochun, XIE Hua, LI Ben, SUN Ruichen   +6 more
doaj   +1 more source

A fault line selection method for flexible grounding systems based on zero-sequence current phase variation

Zhejiang dianli
To address the poor tolerance to transitional resistance and incomplete utilization of fault information in grounding protection for flexible grounding systems， a fault line selection method based on current phase variation is proposed.
LI Zong, WANG Deqiang, FENG Liang, SONG Jianguo, GAO Weiyuan, YUAN Pengsheng   +5 more
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A Visual Fault Detection Method for Induction Motors Based on a Zero-Sequence Current and an Improved Symmetrized Dot Pattern. [PDF]

Entropy (Basel), 2022
Huang L, Wen J, Yang Y, Chen L, Shen G.
europepmc   +1 more source

Simultaneous Optimisation of Zero‐Sequence‐Circulating‐Current and Common‐Mode Voltage in Two Parallel Interleaved Three‐Phase Converters

IET Power Electronics
This paper focuses on maintaining the optimal common mode voltage of the existing zero common mode voltage (ZCMV) method while reducing its large zero‐sequence circulating current.
Jing Feng, Xiaoliang Jin
doaj   +1 more source

Simplified Cluster Voltage Balancing Control Based on Zero-Sequence Voltage Injection for Star-Connected Cascaded H-Bridge STATCOM

CSEE Journal of Power and Energy Systems
The cluster DC voltage balancing control adopting zero-sequence voltage injection is appropriate for the star-connected cascaded H-bridge STATCOM because no zero-sequence currents are generated in the three-phase three-wire system.
Kai Hu, Guoliang Zhao, Daorong Lu, Zhengang Lu, Nianwen Xiang, Shulai Wang, Jintian Lin   +6 more
doaj   +1 more source

Design of Selective Leakage Protection Circuit Based on Method of Amplitude Discrimination and Phase Discriminatio

Gong-kuang zidonghua, 2010
The paper proposed a design scheme of selective leakage protection circuit based on method of amplitude discrimination and phase discrimination for electrical control equipments of fully mechanized devices of coal mine underground.The selective leakage ...
FAN Yi-long~, LI Hang~, YOU Guo-dong~
doaj