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Negative-Sequence Current Injection of Transmission Solar Farms
IEEE Transactions on Power Delivery, 2020Integrating solar generation brings about unique challenges in power system protection. Previous studies have found inverter-based resources featuring distinct fault responses compared to conventional generators. The reduction in fault current magnitude and lack of negative and zero sequence currents can fundamentally impact the way that the power ...
Gefei Kou +4 more
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Negative-sequence currents for line-to-line faults
Electrical Engineering, 1953THE 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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A Method to Reduce the Negative Sequence Current in Electrical Equipments
IEEE Latin America Transactions, 2016A 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 +2 more
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Determining negative sequence currents of turbine generator rotors
2009 International Conference on Electrical Machines and Systems, 2009In parallel to their dynamic duty synchronous generators must be capable of bearing permanently an additional negative sequence current of up to 10% of the rated current according to the IEC 60034–1 standard. On turbine generators this does not only charge the damper winding but causes eddy currents and losses in the solid rotor iron in parallel.
T. Bach +5 more
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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, 2002The 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 +3 more
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Research on Negative-Sequence Electric Current Examination Method
Advanced Materials Research, 2011This 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, 2013This 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 +3 more
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A digital distance relay using negative sequence current
IEEE Transactions on Power Delivery, 1990The 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 +5 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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Analysis on IIDG's negative-sequence current upon asymmetric fault
2016 China International Conference on Electricity Distribution (CICED), 2016As 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 +5 more
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