Appropriate Protection Scheme for DC Grid Based on the Half Bridge Modular Multilevel Converter System

Lee, Ho-Yun; Asif, Mansoor; Park, Kyu-Hoon; Mun, Hyun-Min; Lee, Bang-Wook

doi:10.3390/en12101837

Cited by 12 publications

(5 citation statements)

References 46 publications

(49 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It has no resistance in its superconducting state and, therefore, does not impede the flow of normal current. Additionally, the fault current is limited within about 2 ms through quenching when the critical point of the superconductor is exceeded by the fault current, thereby limiting the growth of the fault current [16][17][18][19][20][21][22][23][24][25][26][27][28][29]. To respond quickly and safely to DC transients, we researched superconductor and mechanical DC cutoff technology and proposed a hybrid superconducting DC circuit breaker [19][20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

The Modeling of the LC Divergence Oscillation Circuit of a Superconducting DC Circuit Breaker Using PSCAD/EMTDC

Park¹,

Kim²,

Jeong³

et al. 2022

Energies

View full text Add to dashboard Cite

We proposed a superconducting DC circuit breaker that can reliably cut off the fault currents in preparation for the DC system. It consists of a superconducting element and a mechanical DC circuit breaker. The mechanical DC circuit breaker is connected in parallel with a mechanical high-speed switch, an LC divergence oscillation circuit, and a surge arrester. This provides stable cutoff operation due to the fault-current-limiting operation of the superconducting element and the artificial current zero point of the mechanical DC circuit breaker. In this paper, the operating principle of the LC divergence oscillation circuit that creates an artificial current zero point was reviewed based on the theory. We used experimental data to model the time constant of the initial fault current, the arc model generated by the mechanical high-speed switch, and the experimental equipment. As a result, the LC divergence oscillation circuit was confirmed in the simulation, and simulation modeling was reviewed based on the theoretical principle of generation.

show abstract

Section: Introductionmentioning

confidence: 99%

The Modeling of the LC Divergence Oscillation Circuit of a Superconducting DC Circuit Breaker Using PSCAD/EMTDC

Park¹,

Kim²,

Jeong³

et al. 2022

Energies

View full text Add to dashboard Cite

show abstract

“…When SFCLs are combined with mechanical DCCBs, it will be easier to interrupt DC fault current because of the low power loss, low recovery voltage, high interrupting ability, and high reliability. Lee, Ho-Yun, et al showed the system recovery characteristics of resistive-type SFCL, saturated iron core SFCL and hybrid-type SFCL in combination with DCCBs by simulations [6]. The hybrid-type SFCL in combination with a DCCB has the best performance in interruption time, recovery time energy dissipation, and voltage transients.…”

Section: Introductionmentioning

confidence: 99%

“…Lee, Ho‐Yun, et al. showed the system recovery characteristics of resistive‐type SFCL, saturated iron core SFCL and hybrid‐type SFCL in combination with DCCBs by simulations [6]. The hybrid‐type SFCL in combination with a DCCB has the best performance in interruption time, recovery time energy dissipation, and voltage transients.…”

Section: Introductionmentioning

confidence: 99%

Study on the influencing factors to reduce the recovery time of superconducting tapes and coils for the DC superconducting fault current limiter applications

Xiang

Wang

et al. 2021

High Voltage

View full text Add to dashboard Cite

Superconducting fault current limiters (SFCLs) are important in improving the stability of electrical power systems. However, the existing resistive-type DC SFCL has a long recovery time, which cannot meet the requirements of power system auto-reclosure. Thus, it is necessary to investigate the methods of reducing recovery time of SFCLs. In the simulations on superconducting tapes, there is a lack of investigation about the effects of design factors of superconducting tapes and coils such as material, thickness, coil radius, coil winding method on recovery characteristics. The objective of this study is to obtain the effects of material and geometric properties of superconducting tapes and coils on recovery characteristics and obtain methods to reduce the recovery time. The recovery times under different conducting currents are also compared by simulations and experiments to verify simulation accuracy. The maximum error is below 40% and most of the cases have an error below 10%. Besides, by increasing tape thickness, the recovery time can be reduced by 22%. Tape materials and coil winding methods can be designed according to the auto-reclosure and current-limiting requirements of the power systems. The research provided directions for the design of superconducting tape and superconducting coil for resistive-type DC SFCLs.

show abstract

“…The simulation results showed that by comparing the specific performance indexes including the current-limiting ratio and restraining capability to voltage/power fluctuations, the R-SFCLs is more preferable than the inductive-type SFCL (I-SFCL) [2,3]. Lee et al studied fault interruption and system recovery characteristics considering three types of fault limiting devices such as an R-SFCL, a saturated iron core SFCL, and a hybrid-type SFCL in combination with DCCBs by simulations [4]. The simulation results showed that, among the three fault limiting devices, the hybrid-type SFCL in combination with a DCCB, delivers the most desirable performance in terms of interruption time, recovery time, energy dissipation, and voltage transients [4].…”

Section: Introductionmentioning

confidence: 99%

“…Lee et al studied fault interruption and system recovery characteristics considering three types of fault limiting devices such as an R-SFCL, a saturated iron core SFCL, and a hybrid-type SFCL in combination with DCCBs by simulations [4]. The simulation results showed that, among the three fault limiting devices, the hybrid-type SFCL in combination with a DCCB, delivers the most desirable performance in terms of interruption time, recovery time, energy dissipation, and voltage transients [4]. Liang et al proposed a DC hybrid-type SFCL with a two-stage current-limiting capability [5,6].…”

Section: Introductionmentioning

confidence: 99%

Short-circuit fault current-limiting characteristics of a resistive-type superconducting fault current limiter in DC grids

Xiang

Gao

Liu

et al. 2020

Supercond. Sci. Technol.

View full text Add to dashboard Cite

Resistive-type superconducting fault current limiters (R-SFCLs) can limit short-circuit fault current and help DC circuit breakers (DCCBs) to isolate short-circuit faults in medium voltage and high voltage DC (HVDC) systems. SFCLs are always used with circuit breakers to break short-circuit current in power systems. The interruption characteristics of the DCCBs influence the current-limiting characteristics of the SFCLs. However, there has been a lack of investigation into the current-limiting and interruption characteristics when R-SFCLs are combined with mechanical-type DCCBs (M-DCCBs) based on the self-excited oscillation interruption principle in medium voltage and HVDC systems. The objective of this paper is to obtain the short-circuit fault current-limiting characteristics of a designed R-SFCL combined with an M-DCCB in DC grids. This paper describes the design of a 10 kV DC R-SFCL which was tested in combination with an M-DCCB in a DC circuit in order to obtain the quenched resistance and the required current interruption characteristics. Besides, a modular multilevel converter-based multi-terminal direct current (MMC-MTDC) grid was used to investigate the current-limiting and interrupting characteristics of the R-SFCL and the M-DCCB in a realistic HVDC grid. The experimental results show that in the 10 kV DC circuit the R-SFCL combined with the M-DCCB limited a 10 kA DC to the peak value of 1416 A and then interrupted this limited current successfully. And unlike other methods of DC interruption, this did not create overvoltage after interruption. The highest voltage on the R-SFCL is the system voltage during interruption. This means that the R-SFCL can effectively delay the voltage drop in MMC-MTDC grids, and provide enough time for the M-DCCB to interrupt the limited current. Thus, a combination of R-SFCLs and M-DCCBs might be an effective and reliable method to interrupt short-circuit fault currents in medium voltage and HVDC grids.

show abstract

Appropriate Protection Scheme for DC Grid Based on the Half Bridge Modular Multilevel Converter System

Cited by 12 publications

References 46 publications

The Modeling of the LC Divergence Oscillation Circuit of a Superconducting DC Circuit Breaker Using PSCAD/EMTDC

The Modeling of the LC Divergence Oscillation Circuit of a Superconducting DC Circuit Breaker Using PSCAD/EMTDC

Study on the influencing factors to reduce the recovery time of superconducting tapes and coils for the DC superconducting fault current limiter applications

Short-circuit fault current-limiting characteristics of a resistive-type superconducting fault current limiter in DC grids

Contact Info

Product

Resources

About