Analysis on Operational Improvement of OCR Using Voltage Component in a Power Distribution System for Application of SFCL

Lim, Sung Hun; Lim, Sung-Hun

doi:10.1007/s42835-019-00089-x

Cited by 12 publications

(8 citation statements)

References 8 publications

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“…In the normal state, the resistance of the HTSC element is zero. Therefore, T-SFCL has an advantage in that it does not affect such as system loss [20][21][22][23][24][25][26].…”

Section: Proposed Solution To Limit Fault Current and Enhance Lvrt Ca...mentioning

confidence: 99%

Simulation of a Low-Voltage Direct Current System Using T-SFCL to Enhance Low Voltage Ride through Capability

et al. 2022

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Owing to the increasing penetration level of distributed energy resources (DER) and direct current (DC) load, the usage of low-voltage direct current (LVDC) systems has expanded to achieve efficient operations. However, because the LVDC system reaches the peak fault current at a faster rate than the alternating current (AC) system, a solution that protects the system components is necessary to maintain system integrity. It is required by the low-voltage ride-through (LVRT) that the DERs maintain their interconnections with the LVDC system and support fault recovery. In this study, a method is proposed to allow the application of the superconducting fault current limiter (SFCL) to reduce the fault current and enhance the LVRT capability. However, when the DER maintain a connection to support fault recovery, the conventional resistive-type SFCL must withstand the burden of high-temperature superconducting (HTSC) operation during fault state dependence on LVRT. Therefore, this study proposes a trigger-type SFCL to reduce the burden of the HTSC element and enhance the LVRT capability. The voltage sag related to the LVRT was improved owing to the SFCL. The proposed solution was confirmed using PSCAD/EMTDC, which is a commercial software.

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“…In the normal state, the resistance of the HTSC element is zero. Therefore, T-SFCL has an advantage in that it does not affect such as system loss [20][21][22][23][24][25][26].…”

Section: Proposed Solution To Limit Fault Current and Enhance Lvrt Ca...mentioning

confidence: 99%

Simulation of a Low-Voltage Direct Current System Using T-SFCL to Enhance Low Voltage Ride through Capability

et al. 2022

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“…Therefore, it is set so that faster interruption occurs where the fault current is large. The following (Equations ( 1) and ( 2)) show characteristic equations generally used in Korea when modeling a relay [12][13][14].…”

Section: Power Distribution Sytem and Ocr(over-current Relay) Modelingmentioning

confidence: 99%

Fluctuation Suppression of DC-Link Voltage Using Control of Converters Connected with DC Distributed Generation

Choi¹,

Lim²

2020

Energies

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Due to the increase in DC load and DC Power generation, the need for DC power system is emerging. Accordingly, FRT (fault ride through) and LVRT (low voltage ride through), which are related regulations for renewable energy sources, have been enacted, and operation algorithms of each converter are required for this. However, the operation of the converter according to LVRT regulations causes DC voltage fluctuations. In the current study, DC voltage fluctuation is suppressed through converter control of DC-linked battery. The controller was designed from the relational equation between DC voltage and instantaneous power of battery. The pattern of DC voltage fluctuations to the output of the PV (photovoltaic), which is a DC power generation source, was confirmed, and voltage fluctuation suppression was verified by applying the designed converter cooperation algorithm and controller.

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“…From equations (9) and (10), it is expected that the operation of OCR can be delayed in case of the SFCL's application due to its current limiting operation. To keep the original operational time of the OCR irrespective of the application of the SFCL, some methods such as the correction of the TD or the setting current ( ) were proposed [6][7]. Figure 5.…”

Section: Modeling Of Over Current Relay (Ocr)mentioning

confidence: 99%

“…This trip delay interrupts the proper operation of the circuit breaker, which affects the protection coordination between the protective relays such as the OCR. Therefore, the resetting of the OCRs considering the application of the SFCL is required to keep the coordination time interval (CTI) between the OCRs [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Enhancement on the Fault Ride through Capability of Power Distribution Systems Linked by Distributed Generation due to the Impedance of Superconducting Fault Current Limiters

Choi

Lim

2019

Energies

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Recently, studies on connecting distributed generation (DG) to power distribution systems through DC links have been actively conducted. When a fault in feeder of this power distribution system occurs, a voltage dip can happen in the grid. In order to prevent voltage dips, there are several solutions such as the application of a superconducting fault current limiter (SFCL). If a SFCL with a larger impedance is applied, the voltage dip of the grid is effectively prevented. However, this action can bring about the malfunction or the delayed operation of the over-current relay (OCR) due to the decreased fault current, which causes another problem of protection coordination between the protective relays. On the other hand, if the impedance of the SFCL is too low, excessive reactive power is supplied by the fault ride-through (FRT) regulation and the active power is reduced. This causes an active power imbalance on the DC link and increases the DC link’s voltage. As previous solutions to prevent the rise of DC links’ voltage, the deloading method and the application of a chopper resistor have been suggested. In this paper, a technique called active power tracking control (APTC), was proposed to suppress the rise of DC links’ voltage. Case studies considering the impedance of SFCL in the constructed power distribution system were carried out, and the rise of DC links’ voltage could be effectively suppressed without any significant delay in the operation of the OCR. This study is expected to solve both the voltage dip of the grid and the rise of DC links’ voltage when distributed generation is connected to a grid.

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Analysis on Operational Improvement of OCR Using Voltage Component in a Power Distribution System for Application of SFCL

Cited by 12 publications

References 8 publications

Simulation of a Low-Voltage Direct Current System Using T-SFCL to Enhance Low Voltage Ride through Capability

Simulation of a Low-Voltage Direct Current System Using T-SFCL to Enhance Low Voltage Ride through Capability

Fluctuation Suppression of DC-Link Voltage Using Control of Converters Connected with DC Distributed Generation

Enhancement on the Fault Ride through Capability of Power Distribution Systems Linked by Distributed Generation due to the Impedance of Superconducting Fault Current Limiters

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