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Real-Time Detecting Method of Negative Sequence Current in Traction System
2007 8th International Conference on Electronic Measurement and Instruments, 2007When electric locomotive moves in power system, it will produce negative sequence current, which will threat the electric equipments and the power system security operation. So it is very important to measure the value of negative sequence current rapidly and exactly. This paper introduces one new kind of method to measure the negative sequence current.
Dai Wenjin, Wu Songhui
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Negative Sequence Current in Megawatt Hydro Generators at Uprated Unbalanced Loads
2018 IEEE International Conference on Power Electronics, Drives and Energy Systems (PEDES), 2018The allowable negative sequence current (NSC) in large generator is 10% of its rated current as per IEC 60034-1 standard, irrespective of its rotor arrangement. This paper scrutinizes the NSC capability of a 250 MW salient pole hydro-generator following an unbalance at rated and above rated loads.
C. Carunaiselvane +2 more
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Fault Detection During Asymmetrical Power Swing Using Superimposed Negative Sequence Current
Arabian Journal for Science and Engineering, 2019Power swing phenomenon occurred during single-pole auto-reclosing (SPAR) period is called asymmetrical power swing. During symmetrical power swing, power swing blocking is used to block distance relay to avoid the selectivity property. Therefore, fault detection is more challenging during asymmetrical power swing since open-pole condition introduces ...
Jitendra Kumar, Premalata Jena
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Wind turbine negative sequence current control and its effect on power system protection
2013 IEEE Power & Energy Society General Meeting, 2013This paper focuses on the control of the negative sequence component of the wind turbine (WT) short circuit current. In many applications the negative sequence component is suppressed partially or entirely. Full negative sequence current suppression control would reduce the line-to-line short circuit current to the level of the load current or even to ...
Erlich, István +4 more
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Harmonic and Negative-Sequence Current Control in an Islanded Multi-Bus MV Microgrid
IEEE Transactions on Smart Grid, 2014This paper presents a multifunctional control strategy for the autonomous operation of a multi-bus medium voltage (MV) microgrid under nonlinear and unbalanced load conditions. The main objective is to effectively compensate the harmonic currents of nonlinear loads using electronically-coupled distributed generation (DG) units.
Mohsen Hamzeh +2 more
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Negative-Sequence Current Injection for Fast Islanding Detection of a Distributed Resource Unit
IEEE Transactions on Power Electronics, 2008This paper presents an active islanding detection method for a distributed resource (DR) unit which is coupled to a utility grid through a three-phase voltage-sourced converter (VSC). The method is based on injecting a negative-sequence current through the VSC controller and detecting and quantifying the corresponding negative-sequence voltage at the ...
Houshang Karimi +2 more
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2020 International Conference on Electrotechnical Complexes and Systems (ICOECS), 2020
It is demonstrated that at the occurrence of geomagnetic disturbances the value of quasi-direct current acting on a generator step-up transformer depends on the type and number of blocks "synchronous generator – generator step-up transformer" as parts of a power plant, phase wire parameters, geographic direction of overhead power lines extending away ...
Vera Vakhnina +3 more
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It is demonstrated that at the occurrence of geomagnetic disturbances the value of quasi-direct current acting on a generator step-up transformer depends on the type and number of blocks "synchronous generator – generator step-up transformer" as parts of a power plant, phase wire parameters, geographic direction of overhead power lines extending away ...
Vera Vakhnina +3 more
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Directional Relaying During Single-Pole Tripping Using Phase Change in Negative-Sequence Current
IEEE Transactions on Power Delivery, 2013Single-pole tripping (SPT) operation imposes problem to many power network relaying schemes. In this paper the directional relaying issue for faults during SPT condition is addressed. Algorithms applying negative sequence components of fault voltage and current for directional relaying find limitation during SPT as the prefault signals also contain ...
Premalata Jena, Ashok Kumar Pradhan
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A practical improvement to stator ground fault protection using negative sequence current
2013 IEEE Power & Energy Society General Meeting, 2013This paper discusses the phenomenon of zero sequence voltage coupling from the high-voltage system to the high-impedance grounded low-voltage bus for a synchronous generator and a simple improvement to accelerate stator ground fault protection (59G) using negative sequence current.
Russell W. Patterson, Ahmed Eltom
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Islanding detection method with negative-sequence current injection under unbalanced grid voltage
2015 IEEE 2nd International Future Energy Electronics Conference (IFEEC), 2015This paper proposes an active islanding detection method for the BESS (Battery Energy Storage System) with a three-phase inverter which is connected to the unbalanced AC grid. The proposed method adopts the DDSRF (Decoupled Double Synchronous Reference Frame) PLL (Phase-Locked Loop) so that the independent control of positive-sequence and negative ...
null Hyun-Jun Kim +2 more
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