Results 21 to 30 of about 12,500,295 (288)

Analysis and Compensation of Negative Phase-sequence for Traction Transformer

Kongzhi Yu Xinxi Jishu, 2014
It analyzed the characteristics of negative phase-sequence current for traction transformers with different connection types under different loads. The three-phase current asymmetry degree of traction transformers is serious under both traction load and ...
SHI Minghui, LUO Wenguang, HE Duochang, ZHANG Zhixue   +3 more
doaj   +2 more sources

Characteristics and Control Strategy of Cascaded SVG with Star-configuration Considering Negative-sequence Compensation

Kongzhi Yu Xinxi Jishu, 2013
This paper illustrated var and negative sequence comprehensive compensation principles of cascaded static var generator(SVG) with star-configuration. The mathematical expression of zero-sequence voltage was deduced, and subsequently zero-sequence voltage
XIONG Qiaopo, LUO An, ZENG Zhizhen
doaj   +2 more sources

Practical calculation of asymmetric short circuit current of DFIG connected to distribution network [PDF]

E3S Web of Conferences, 2020
In view of the existing complex analytic calculations of DFIG short-circuit current are hardly applied in engineering projects, a practical calculation of asymmetric short-circuit current of DFIG is proposed.
Fu Pengwu, Yang Dongwen, He Zhi, Duan Zhenfeng, Wang Dengmei   +4 more
doaj   +1 more source

Active Control Method for Torsional Vibration of DFIG Drive Chain Under Asymmetric Power Grid Fault

IEEE Access, 2020
When the asymmetric fault occurs in power grid, it will cause the oscillation of the electromagnetic torque of the doubly-fed induction generator(DFIG).
Shiji Tian, Zhongyi Li, Hui Li, Yihua Hu, Min Lu   +4 more
doaj   +1 more source

Weak-Grid Tolerant Positive- and Negative-Sequence Current Control of Voltage-Source Converters [PDF]

2021 IEEE PES Innovative Smart Grid Technologies Europe (ISGT Europe), 2021
Peer ...
Kukkola, Jarno, Rahman, F M Mahafugur, Hinkkanen, Marko, Pirsto, Ville   +4 more
openaire   +4 more sources

Grid-Following Voltage Source Converters: Basic Schemes and Current Control Techniques to Operate With Unbalanced Voltage Conditions

IEEE Open Journal of the Industrial Electronics Society, 2021
The growing relevance of voltage source converters (VSCs), and the deep impact they have on the development and maintenance of the electrical grid, increase the necessity of further research on how to deal with nonideal grid conditions from the VSCs ...
Pablo Montero-Robina, Kumars Rouzbehi, Francisco Gordillo, Josep Pou   +3 more
doaj   +1 more source

Improvement of the transient negative-sequence rating formula for large generators based on the negative-sequence current component

International Transactions on Electrical Energy Systems, 2015
Summary This paper proposes an improved transient negative-sequence calculation formula for a large-capacity nuclear power generator system under unbalanced network conditions. Because of the disadvantages of traditional transient negative-sequence ratings, I2*2 t is concluded to be inadequate for rating the generator imbalance capability.
Bao-jun Ge, Wu Guo, Jian Guo, Yun-peng Gao, Ming-ze Li   +4 more
openaire   +1 more source

Current limiting and negative differential resistance in indium oxide based ceramics [PDF]

, 2009
Indium oxide based ceramics with bismuth oxide addition were sintered in air in the temperature range 800-1300 ºC. Current-voltage characteristics of In2O3-Bi2O3 ceramics sintered at different temperatures are weakly nonlinear.
Bondarchuk, AN, Jones, Benjamin, A.B. Glot, A.N. Bondarchuk, Jones, BJ, Bondarchuk, A N, Glot, AB, R. Bulpett, Verma, N, Bulpett, R, Mazurik, SV, Mazurik, S V, B.J. Jones, Jones, B J, N. Verma, Mazurik, S.V., S.V. Mazurik, Glot, A B, Glot, A.B., Bondarchuk, A.N.   +19 more
core   +1 more source

MMC-SST input-level control strategy considering power quality optimization

电力工程技术, 2022
The surge of negative sequence component of current affects the waveform quality of grid side current and endangers the normal operation of the system when the three-phase voltage of solid state transformer (SST) in the distribution network is unbalanced
ZHAO Wei, YUAN Zhi, WANG Weiqing, HE Shan   +3 more
doaj   +1 more source

Unbalanced Current Sharing Control in Islanded Low Voltage Microgrids

Energies, 2018
This paper reports a new control strategy to improve sharing of unbalanced currents in islanded LV microgrids. This technique provides fast and effective sharing of positive-, negative- and zero-sequence currents, and is the first example of zero ...
Foad Najafi, Mohsen Hamzeh, Matthias Fripp   +2 more
doaj   +1 more source