Reclosing control system and method using superconducting fault current limiter
View Patent ↗The present invention relates to a reclosing control system and method using a superconducting fault current limiter. The reclosing control system includes a superconducting fault current limiting device in which two circuits, each having a switch and a superconducting fault current limiter connected in series with each other, are connected in parallel with each other. A recloser is disposed between the superconducting fault current limiting device and a distribution line and is configured to control reclosing. The distribution line is connected to the recloser and is configured to transfer power to a load.
1. A reclosing control system, comprising:
a superconducting fault current limiting device in which two circuits, each having a switch and a Superconducting Fault Current Limiter (SFCL) connected in series with each other, are connected in parallel with each other;
a recloser located between the superconducting fault current limiting device and a distribution line and configured to control reclosing; and
the distribution line connected to the recloser and configured to transfer power to a load,
wherein the recloser detects a fault clearing time by applying a carrier signal when a fault occurs on the distribution line, and performs reclosing considering the fault clearing time and a recovery time of a relevant SFC,
wherein the distribution line is connected to a bus to supply power to the load, and the recloser determines whether the fault has been cleared by detecting the carrier signal on the bus,
wherein the recloser detects the carrier signal by detecting variation in an effective value on the bus.
2. The reclosing control system according to claim 1 , wherein the recloser performs control such that reclosing is performed after the recovery time of the SFCL has elapsed when a sum of the fault clearing time and the recovery time of the SFCL is less than a reference time.
3. The reclosing control system according to claim 1 , wherein the recloser performs control such that reclosing is performed after switching the SFCL of the superconducting fault current limiting device after the fault has been cleared when the fault clearing time exceeds a reference time.
4. The reclosing control system according to claim 1 , wherein the recloser performs control such that reclosing is performed after switching the SFCL of the superconducting fault current limiting device after a predetermined period of time has elapsed when the fault clearing time is less than a reference time and a sum of the fault clearing time and the recovery time of the SFCL exceeds the reference time.
5. The reclosing control system according to claim 1 , wherein the recloser determines whether the fault has occurred by checking magnitude of current flowing from the superconducting fault current limiting device to the recloser.
6. A reclosing control method using a superconducting fault current limiter, comprising:
a reclosing control system detecting a fault occurring on a distribution line;
the reclosing control system, which detects the fault, tripping the distribution line;
the reclosing control system determining whether the fault has been cleared by applying a carrier signal to the distribution line;
the reclosing control system controlling reclosing in consideration of a fault clearing time and a recovery time of a Superconducting Fault Current Limiter (SFCL);
the reclosing control system determining whether the fault has been cleared by applying the carrier signal to the distribution line, wherein the reclosing control system is configured such that the distribution line is connected to a bus to supply power to a load;
the reclosing control system determining whether the fault has been cleared by detecting the carrier signal on the bus; and,
the reclosing control system detecting the carrier signal by using variation in an effective value on the bus.
7. The reclosing control method according to claim 6 , wherein the reclosing control system controlling reclosing in consideration of the fault clearing time and the recovery time of the SFCL is configured to perform control such that reclosing is performed after the recovery time of the SFCL has elapsed when a sum of the fault clearing time and the recovery time of the SFCL is less than a reference time.
8. The reclosing control method according to claim 6 , wherein the reclosing control system controlling reclosing in consideration of the fault clearing time and the recovery time of the SFCL is configured to perform control such that reclosing is performed after switching the SFCL of the superconducting fault current limiting device after the fault has been cleared when the fault clearing time exceeds a reference time.
9. The reclosing control method according to claim 6 , wherein the reclosing control system controlling reclosing in consideration of the fault clearing time and the recovery time of the SFCL is configured to perform control such that reclosing is performed after switching the SFCL of the superconducting fault current limiting device after a predetermined period of time has elapsed when the fault clearing time is less than a reference time and a sum of the fault clearing time and the recovery time of the SFCL exceeds the reference time.
10. The reclosing control method according to claim 6 , wherein the reclosing control system detecting the fault occurring has occurred by checking magnitude of current flowing through a previous stage of the reclosing control system.