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1. WO2020198565 - FEEDER LINE FAULT RESPONSE USING DIRECT CURRENT INTERCONNECTION SYSTEM

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[ EN ]

CLAIMS

What is claimed is:

1. A method for operating an alternating current (AC) distribution network including a first feeder line, a second feeder line, and a third feeder line, the method comprising:

isolating a faulted portion of the first feeder line from a healthy portion of the first feeder line;

closing a tie switch coupled between the healthy portion and the second feeder line in response to isolating the faulted portion from the healthy portion;

determining the second feeder line is experiencing an overload condition after closing the tie switch; and

transferring AC power from the third feeder line using a DC interconnection system coupled to the third feeder line effective to reduce a magnitude of the overload condition of the second feeder line.

2. The method of claim 1 wherein the tie switch is coupled in parallel with a second DC interconnection system including two AC/DC power converters structured to control reactive power between the healthy portion and the second feeder line while the tie switch is closed.

3. The method of claim 1 wherein the healthy portion is coupled to a plurality of tie switching devices, and wherein closing the tie switch includes selecting the tie switch using a calculated headroom value for the second feeder line.

4. The method of claim 1 wherein determining the second feeder line is experiencing the overload condition includes determining a rated current of at least one line segment of the second feeder line is exceeded by a current flowing through the at least one line segment, and wherein transferring AC power includes receiving the AC power with the first feeder line effective to reduce the current flowing through the at least one line segment to a current magnitude less than the rated current.

5. The method of claim 1 wherein transferring AC power includes determining a set point for the DC interconnection system using a plurality of headroom values each corresponding to points on at least one of the first feeder line and second feeder line.

6. The method of claim 1 wherein transferring AC power includes determining a set point for the DC interconnection system using a voltage profile each corresponding to voltages at points on at least one of the first feeder line and second feeder line.

7. The method of claim 1 wherein transferring AC power to the first feeder line includes transferring AC power from a second DC interconnection system to the healthy portion, wherein operation of the first DC interconnection system and the second DC interconnection system are coordinated so as to remove the overload condition from the second feeder line and prevent another overload condition from occurring within third feeder line.

8. The method of claim 1 wherein the AC distribution network includes a tap changer, wherein transferring AC power to the first feeder line includes determining a coordinated solution for the tap changer and the DC interconnection system effective to eliminate the overload condition on the second feeder line, and generating control signals for the tap changer and DC interconnection system using the coordinated solution.

9. An alternating current (AC) distribution network comprising:

a first feeder line;

a second feeder line;

a third feeder line;

a tie switch coupled between the first feeder line and the second feeder line;

a DC interconnection system coupled to the third feeder line; and

a control system structured to isolate a faulted portion of the first feeder line from a healthy portion of the first feeder line, close the tie switch in response to isolating the faulted portion from the healthy portion, detect an overload condition on a segment of the second feeder line; and transfer AC power from the third feeder line using the DC interconnection system

effective to reduce a magnitude of the overload condition of the segment of the second feeder line.

10. The AC distribution network of claim 9 wherein the tie switch is coupled in parallel with a second DC interconnection system structured to control reactive power between the healthy portion and the first feeder line while the tie switch is closed.

11. The AC distribution network of claim 9 wherein the healthy portion is coupled to a plurality of tie switching devices, and wherein closing the tie switch includes selecting the tie switch using a calculated headroom value for the second feeder line or a circuit breaker status.

12. The AC distribution network of claim 9 wherein detecting the overload condition includes determining a rated current of the segment of the second feeder line is exceeded by a current flowing through the segment, and wherein transferring AC power includes receiving the AC power with the first feeder line effective to reduce the current flowing through the segment to a current magnitude less than the rated current.

13. The AC distribution network of claim 9 wherein transferring AC power includes determining a set point for the DC interconnection system using a plurality of headroom values each corresponding to points on at least one of the first feeder line and second feeder line.

14. The AC distribution network of claim 9 wherein transferring AC power includes determining a set point for the DC interconnection system using a voltage profile each corresponding to voltages at points on at least one of the first feeder line and second feeder line.

15. The AC distribution network of claim 9 wherein transferring AC power to the first feeder line includes transferring AC power from a second DC interconnection system to the healthy portion, wherein operation of the first DC interconnection system and the second DC

interconnection system are coordinated so as to remove the overload condition from the second feeder line and prevent another overload condition from occurring within the third feeder line.

16. The AC distribution network of claim 9 wherein the AC distribution network includes a tap changer, wherein transferring AC power to the first feeder line includes determining a coordinated solution for the tap changer and the DC interconnection system effective to eliminate the overload condition on the second feeder line, and generating control signals for the tap changer and DC interconnection system using the coordinated solution.

17. A control system for an alternating current (AC) distribution network comprising:

a processing device;

a computer readable non-transitory medium including a set of instructions executable by the processing device effective to:

operate a tie switch coupled between a first feeder line and a second feeder line of the AC distribution network;

operate a DC interconnection system coupled to a third feeder line; isolate a faulted portion of the first feeder line from a healthy portion of the second feeder line;

close the tie switch in response to isolating the faulted portion from the healthy portion;

determine the second feeder line is experiencing an overload condition after closing the tie switch; and

transfer AC power to the first feeder line including transferring AC power from the third feeder line using a DC interconnection system effective to reduce a magnitude of the overload condition from the second feeder line.

18. The control system of claim 17 wherein the tie switch is coupled in parallel with a second DC interconnection system structured to control reactive power between the healthy portion and the first feeder line while the tie switch is closed.

19. The control system of claim 17 wherein the healthy portion is coupled to a plurality of tie switching devices, and wherein closing the tie switch includes selecting the tie switch using a calculated headroom value for the second feeder line or a circuit breaker status.

20. The control system of claim 17 wherein detecting the overload condition includes determining a rated current of a segment of the second feeder line is exceeded by a current flowing through the segment, and wherein transferring AC power includes receiving the AC power with the first feeder line effective to reduce the current flowing through the segment to a current magnitude less than the rated current.

21. The control system of claim 17 wherein transferring AC power includes determining a set point for the DC interconnection system using a plurality of headroom values each

corresponding to points on at least one of the first feeder line and second feeder line, or wherein transferring AC power includes determining a set point for the DC interconnection system using a voltage profile each corresponding to voltages at points on at least one of the first feeder line and second feeder line.

22. The control system of claim 17 wherein transferring AC power to the first feeder line includes transferring AC power from a second DC interconnection system to the healthy portion, wherein operation of the first DC interconnection system and the second DC interconnection system are coordinated so as to remove the overload condition from the second feeder line and prevent another overload condition from occurring within the third feeder line.

23. The control system of claim 17 wherein the AC distribution network includes a tap changer, wherein transferring AC power to the first feeder line includes determining a coordinated solution for the tap changer and the DC interconnection system effective to eliminate the overload condition on the second feeder line, and generating control signals for the tap changer and DC interconnection system using the coordinated solution.