Results 251 to 260 of about 2,384,002 (300)

Research on Negative-Sequence Electric Current Examination Method

Advanced Materials Research, 2011
This paper based on traditional ip, iq examination's method , introduces one kind of non-phase-locked loop's ip, iq method. this method avoids the mains frequency displacement the influence, causes the examination to be more conveniently. With the MATLAB simulation of software, obtain the satisfactory results, thus proving the usefulness of this method.
Kai Wang, Wen Jin Dai
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Impact of negative sequence current injection by wind power plants

2013 IEEE Power & Energy Society General Meeting, 2013
This paper presents an analysis of the impact from negative sequence current injection by wind power plants in power systems under steady-state and short-term unbalanced conditions, including faults. The separate positive and negative sequence current control capability of the grid-side converters of full scale converter type wind turbines may be ...
Sanjay K. Chaudhary, Omer Goksu, Remus Teodorescu, Philip C. Kjaer   +3 more
openaire   +3 more sources

Negative-sequence currents for line-to-line faults

Electrical Engineering, 1953
THE RECENT REVISION of the American Standards Association Standard for Rotating Electrical Machinery, C50, short-circuit clause specifies requirements for synchronous generators during 3-phase, line-to-ground, and line-to-line short circuits. A generator operating at rated kilovolt-amperes and power factor, with fixed excitation at 5-per-cent ...
R. F. Lawrence, R. W. Ferguson
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Negative sequence current reduction for generator/turbine protection

Conference Record of the 1993 IEEE Industry Applications Conference Twenty-Eighth IAS Annual Meeting, 2002
The authors present a feasible method for negative sequence current reduction at the generator terminal through a special function static VAr compensator (SVC). A specially designed fixed-capacitor thyristor-controlled reactor SVC is used. Computer simulation and laboratory test results show that it can effectively reduce negative sequence current at a
W.-J. Lee, T.-Y. Ho, J.-P. Liu, Y.-H. Liu   +3 more
openaire   +1 more source

A digital distance relay using negative sequence current

IEEE Transactions on Power Delivery, 1990
The configuration and performance of a recently developed digital distance relay using negative sequence current for remote backup protection are described. Since relays for remote backup protection are designed for remote faults, the fault current that is input to the relay is small due to the influence of current distribution factors.
Y. Ohura, T. Matsuda, M. Suzuki, F. Andow, Y. Kurosawa, A. Takeuchi   +5 more
openaire   +1 more source

Analysis on IIDG's negative-sequence current upon asymmetric fault

2016 China International Conference on Electricity Distribution (CICED), 2016
As a large number of distributed generations (DG) are connected to the distribution network, the fault current of the distribution network has been changed, and the reliable operation of relay protection in the distribution network has been influenced.
Hua Shao, Haobin Zhu, Rong Lin, Guangfu Xu, Qunbing Yu, Chunguang He   +5 more
openaire   +1 more source

Grid Support During Asymmetrical Faults using Negative Sequence Current Injection

2019 IEEE 4th International Future Energy Electronics Conference (IFEEC), 2019
This paper investigates the effect of injecting negative sequence reactive current into the grid in case of asymmetrical faults. In such conditions, the negative sequence voltage will increase and may cause instability in the system or damage to some equipment such as three phase rotating machines. Hence, the aim of this study is to support the grid by
Mohammad Bani Shamseh, Ruben Inzunza, Issei Fukasawa, Tsuguhiro Tanaka, Tatsuaki Ambo   +4 more
openaire   +1 more source

Negative Sequence Current Control in Wind Power Plants With VSC-HVDC Connection

IEEE Transactions on Sustainable Energy, 2012
Large offshore wind power plants may have multi-MW wind turbine generators (WTG) equipped with full-scale converters (FSC) and voltage source converter (VSC) based high voltaage direct-current (HVDC) transmission for gridconnection. The power electronic converters in theWTG-FSC and the VSC-HVDC allow fast current control in the offshore grid.
Chaudhary, Sanjay; id_orcid 0000-0001-8812-3571, Teodorescu, Remus; id_orcid 0000-0002-2617-7168, Rodriguez, Pedro, Carne Kjaer, Philip, Gole, Ani M.   +4 more
openaire   +2 more sources

Evaluation of negative-sequence-current compensators for high-speed electric railways

2016 IEEE Energy Conversion Congress and Exposition (ECCE), 2016
This paper evaluates three alternative topologies for a static compensator (StatCom), suitable to eliminate the negative-sequence currents in a railway system. The compensator is placed in a transformer substation, which feeds two separate sections of the catenary.
Antonios Antonopoulos, Jan R. Svensson
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A Method to Reduce the Negative Sequence Current in Electrical Equipments

IEEE Latin America Transactions, 2016
A multiphase optimal power flow method for limiting unbalances of currents in equipments using reactive compensation is proposed in this paper. The equipment modeling is based on current injection method in rectangular coordinates. The method was implemented and the proposed computational tool was developed with Matlab® and Lingo® softwares.
Tatianna Aparecida Pereira Beneteli, Debora Rosana Ribeiro Penido, Leandro Ramos Araujo   +2 more
openaire   +1 more source