Voltage Sag Analysis in Loop Power Distribution System With SFCL

Moon, Jong-Fil; Kim, Jin-Seok

doi:10.1109/tasc.2013.2238374

Cited by 25 publications

(11 citation statements)

References 7 publications

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“…A WT can extract time and frequency information simultaneously from an original signal [17][18][19] (1) where x(n) is the input signal, g(n) is the mother wavelet (MW), a m 0 is a scale parameter, na m 0 b 0 is the time shift of g(n), and scaling parameter "a" and translation parameter "b" are functions of integer parameter m [17][18][19]. The values of a, b, and m are different according to the types of MW.…”

Section: Wavelet Transformmentioning

confidence: 99%

“…However, because it is different from conventional radial distribution systems, various problems can occur relating to the system operation, power quality, protection, etc. In view of the power quality, problems such as voltage sags, harmonics reduction, and line losses have been analyzed, and methods for improvement have been proposed [1][2][3][4]. Regarding the system operation and configuration, research has been conducted on tie switch connection points, system planning, and locations of DGs for loop system configuration [5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

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Novel Protection Scheme considering Tie Switch Operation in an Open-Loop Distribution System using Wavelet Transform

Seo¹

2019

Energies

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Loop power distribution systems are gaining increasing attention due to improvements in the reliability of the power supply and the connection of distributed generation. With loop distribution systems, there is the possibility of mal-operation of the protection relay because of the existence of the tie switch and bi-directional current injection. In this paper, we propose a novel protection scheme considering the tie switch operation in the open loop power distribution system using wavelet transform. We analyze the possibility of mal-operation of the protection relay as a result of the normal load current after tie switch operation and analyze the characteristics of the normal load current and fault current injection after tie switch operation. Using these results, a new index is proposed to distinguish the normal load current and fault current, and a novel protection scheme based on this new index is proposed. The proposed method is modeled using an electromagnetic transients program and MATLAB, and the various simulations are performed according to the tie switch position, the fault location, and the success or failure of the fault section separation. From the simulation results, we can confirm that the normal load current and the fault current after tie switch operation can be accurately distinguished and the protection relay can accurately operate at only fault conditions.

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Section: Wavelet Transformmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Novel Protection Scheme considering Tie Switch Operation in an Open-Loop Distribution System using Wavelet Transform

Seo¹

2019

Energies

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“…In the normal state, the resistance of the HTSC is zero, so there is no effect on the system. If the fault current exceeds the threshold value, the HTSC has resistance due to quenching phenomenon [20][21][22]. Figure 7 show the operating sequence of the T-SFCL.…”

Section: Superconducting Fault Current Limitersmentioning

confidence: 99%

“…The t 0 , t 1 , and t 2 represent quench starting time, first recovery starting time, and secondary recovery starting time, respectively. The a 1 , a 2 , b 1 , and b 2 represent the coefficients of experimental result of the recovery characteristics of the SFCL [20][21][22].…”

Section: Superconducting Fault Current Limitersmentioning

confidence: 99%

Application of a Superconducting Fault Current Limiter to Enhance the Low-Voltage Ride-Through Capability of Wind Turbine Generators

2019

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The penetration of wind turbine generators onto the grid has grown worldwide at unprecedented rates in recent years. This raises the concern that the tripping of wind turbine generators could potentially cause system collapses. To alleviate these concerns, wind turbine generators need to maintain connection with the grid when a grid fault occurs. This has provoked many countries to adopt low-voltage ride-through (LVRT) for wind turbine generators. The LVRT is the capability of wind turbine generators to maintain connectivity during certain periods of voltage sag. The wind turbine generators should be connected to the grid to support fault recovery. Also, wind turbine generators must provide reactive power according to the grid voltage sag. Therefore, much research has been focused on enhancing LVRT capability. To enhance LVRT capability, this paper proposes the application of a superconducting fault current limiter (SFCL) in the system. The fault current was suppressed and the voltage sag was improved through the application of the SFCL. By improving the voltage sag, the wind turbine generator and the grid were able to maintain a connection. However, suppression of the fault current can cause a problem in the overcurrent relay (OCR) trip time delay. The trip time delay was solved by OCR resetting. Through a power system computer-aided design/electromagnetic transients including DC (PSCAD/EMTDC), the enhancement of LVRT capability and improvement of the trip delay was confirmed.

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“…Equation (1) denotes time-dependent model of HTS element in different modes. 40 The resistance in quench state and time constant of HTS element are represented by R n and T F , respectively. t 0 is also defined as the quench inception time.…”

Section: Theoretical Model Of Hsfclmentioning

confidence: 99%

Impact of fault resistance and fault distance on fault current reduction ratio of hybrid SFCL

Barzegar-Bafrooei

Foroud

2017

Int Trans Electr Energ Syst

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Summary Superconducting fault current limiters (SFCLs), as the novel power system devices, have attracted attentions in the last years. However, in order to achieve the maximum benefit from SFCLs, their interaction with power system should be comprehensively evaluated before equipping the power system with them. This paper investigates the effect of fault resistance and fault distance on the steady‐state fault current reduction ratio (FCRR) of hybrid SFCL. Based on the equivalent circuit model, analytical studies are presented to obtain the relation between 2 abovementioned factors and the FCRR of hybrid SFCL. Then, through the detailed simulation studies, the current limiting behavior of hybrid SFCL is evaluated when the value of fault resistance and the position of fault change in wide range. As a result, although the hybrid SFCL is able to reduce the fault current under different circumstances; however, FCRR significantly varies under outside the control changing circumstances. For far faults and faults with high fault resistance, the FCRR of hybrid SFCL is not as good as the other fault conditions. Hence, in the last section of the paper, the remedial actions to enhance the performance of hybrid SFCL during these conditions are proposed.

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Voltage Sag Analysis in Loop Power Distribution System With SFCL

Cited by 25 publications

References 7 publications

Novel Protection Scheme considering Tie Switch Operation in an Open-Loop Distribution System using Wavelet Transform

Novel Protection Scheme considering Tie Switch Operation in an Open-Loop Distribution System using Wavelet Transform

Application of a Superconducting Fault Current Limiter to Enhance the Low-Voltage Ride-Through Capability of Wind Turbine Generators

Impact of fault resistance and fault distance on fault current reduction ratio of hybrid SFCL

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