Short-circuit current control in power systems

1 . A method of short-circuit current control in a power system, the method comprising:

determining a respective maximum short-circuit current (SCC) value at each piece of equipment in the power system;

comparing a respective SCC rating of each piece of the equipment in the power system with the respective maximum SCC value at the piece of the equipment;

in response to the maximum SCC values at one or more pieces of the equipment exceeding the SCC ratings of the one or more pieces of the equipment, determining a target reactance of a variable series reactor in a mobile short-circuit control unit to be installed between two points of the power system;

adjusting a reactance of the variable series reactor to the target reactance;

installing the mobile short-circuit control unit between the two points of the power system; and

wherein adjusting the reactance of the variable series reactor to the target reactance comprises selecting a tap position from a plurality of tap positions of the variable series reactor in the mobile short-circuit control unit, and wherein the tap position corresponds to the reactance of the variable series reactor that is equal to or larger than the target reactance.

2 . The method according to claim 1 , wherein determining the target reactance of the variable series reactor comprises:

obtaining a line-to-line rated voltage of the power system;

obtaining a symmetrical short-circuit current between the two points of the power system; and

determining the target reactance of the variable series reactor based on the line-to-line rated voltage of the power system, the SCC ratings of the one or more pieces of the equipment, and the symmetrical short-circuit current between the two points of the power system.

3 . The method according to claim 1 , further comprising:

after installing the mobile short-circuit control unit between the two points of the power system, connecting the two points of the power system using the variable series reactor in the mobile short-circuit control unit.

4 . A method of short-circuit current control in a power system, the method comprising:

determining a respective maximum short-circuit current (SCC) value at each piece of equipment in the power system;

comparing a respective SCC rating of each piece of the equipment in the power system with the respective maximum SCC value at the piece of the equipment;

in response to the maximum SCC values at one or more pieces of the equipment exceeding the SCC ratings of the one or more pieces of the equipment, determining a target reactance of a variable series reactor in a mobile short-circuit control unit to be installed between two points of the power system;

adjusting a reactance of the variable series reactor to the target reactance;

installing the mobile short-circuit control unit between the two points of the power system; and

after installing the mobile short-circuit control unit between the two points of the power system, connecting the two points of the power system using the variable series reactor in the mobile short-circuit control unit;

wherein connecting the two points of the power system using the variable series reactor comprises sending, at a first time, a first signal to the mobile short-circuit control unit, wherein the first signal indicates to connect the two points of the power system using the variable series reactor.

5 . A method of short-circuit current control in a power system, the method comprising:

determining a respective maximum short-circuit current (SCC) value at each piece of equipment in the power system;

comparing a respective SCC rating of each piece of the equipment in the power system with the respective maximum SCC value at the piece of the equipment;

in response to the maximum SCC values at one or more pieces of the equipment exceeding the SCC ratings of the one or more pieces of the equipment, determining a target reactance of a variable series reactor in a mobile short-circuit control unit to be installed between two points of the power system;

adjusting a reactance of the variable series reactor to the target reactance;

installing the mobile short-circuit control unit between the two points of the power system; and

after installing the mobile short-circuit control unit between the two points of the power system, connecting the two points of the power system using a bypass circuit breaker in the mobile short-circuit control unit.

6 . The method according to claim 5 , wherein connecting the two points of the power system using the bypass circuit breaker comprises sending, at a second time, a second signal to the mobile short-circuit control unit, wherein the second signal indicates to connect the two points of the power system using the bypass circuit breaker.

7 . The method according to claim 4 , wherein determining the target reactance of the variable series reactor comprises:

obtaining a line-to-line rated voltage of the power system;

obtaining a symmetrical short-circuit current between the two points of the power system; and

determining the target reactance of the variable series reactor based on the line-to-line rated voltage of the power system, the SCC ratings of the one or more pieces of the equipment, and the symmetrical short-circuit current between the two points of the power system.

8 . The method according to claim 4 , wherein adjusting the reactance of the variable series reactor to the target reactance comprises selecting a tap position from a plurality of tap positions of the variable series reactor in the mobile short-circuit control unit, and wherein the tap position corresponds to a reactance of the variable series reactor that is equal to or larger than the target reactance.

9 . The method according to claim 4 , further comprising: after installing the mobile short-circuit control unit between the two points of the power system, connecting the two points of the power system using the variable series reactor in the mobile short-circuit control unit.

10 . The method according to claim 5 , wherein determining the target reactance of the variable series reactor comprises:

obtaining a line-to-line rated voltage of the power system;

obtaining a symmetrical short-circuit current between the two points of the power system; and

determining the target reactance of the variable series reactor based on the line-to-line rated voltage of the power system, the SCC ratings of the one or more pieces of the equipment, and the symmetrical short-circuit current between the two points of the power system.

11 . The method according to claim 5 , wherein adjusting the reactance of the variable series reactor to the target reactance comprises selecting a tap position from a plurality of tap positions of the variable series reactor in the mobile short-circuit control unit, and wherein the tap position corresponds to a reactance of the variable series reactor that is equal to or larger than the target reactance.

12 . The method according to claim 5 , further comprising: after installing the mobile short-circuit control unit between the two points of the power system, connecting the two points of the power system using the variable series reactor in the mobile short-circuit control unit.