KR20170054081A - Apparatus and method for controlling distance relay - Google Patents

Abstract

The present invention relates to a method for controlling a distance relay, which protects a power system to which thyristor-controlled series capacitors (TCSC) are applied. The method for controlling a distance relay according to an embodiment of the present invention comprises the steps of: determining an operation mode of TCSC; acquiring a reference setting value corresponding to the determined operation mode; and changing a setting value of a distance relay to the reference setting value when the setting value set in the distance relay is different from the reference setting value.

Description

[0001] APPARATUS AND METHOD FOR CONTROLLING DISTANCE RELAY [0002]

The present invention relates to a power system. More particularly, the present invention relates to the field of protection of power systems.

It is essential to remove or block the fault section quickly and accurately when a fault occurs in the power system. To this end, a protective relay operating in various ways such as current differential relay method, distance relay method, and overcurrent relay method is essential for the power system .

In addition, FACTS (Flexible AC Transmission System) means an electric power equipment installed in series or parallel to a power system and capable of controlling active power, reactive power, bus line voltage, etc. of the power transmission line, Depending on the method, it can be classified into a serial type such as TCSC or SSSC or a parallel type such as SVC or STATCOM.

The FACTS controls the power system by adjusting the parameters of the power system for each predetermined operation mode, and converts the operation mode according to the state of the power system. In particular, a distance relay operates based on electrical distance (i.e., impedance). When the impedance of the power system is changed by the TCSC, an error may occur in the operation of the distance relay.

An apparatus and method for controlling a power system distance relay including a TCSC according to an embodiment of the present invention aims at preventing malfunction of a distance relay.

Another object of the present invention is to provide an apparatus and method for controlling a power system distance relay including a TCSC according to an embodiment of the present invention.

According to an embodiment of the present invention,

A method of controlling a distance relay for protecting a power system to which a Thyristor-Controlled Series Capacitor (TCSC) is applied, the method comprising: determining an operation mode of the TCSC; Obtaining a reference set value corresponding to the determined operation mode; And changing the set value of the distance relay to the reference set value when the set value set in the distance relay is different from the reference set value.

The operation mode of the TCSC includes a first mode which is a capacitive reactance boost mode, a second mode which is a Thyristor-Controlled Reacer (TCR) block mode, a third mode which is a TCR bypass mode, and a fourth mode which is a circuit breaker bypass mode .

The first reference setting value corresponding to the first mode, the second reference setting value corresponding to the second mode, the third reference setting value corresponding to the third mode, and the fourth reference setting value corresponding to the fourth mode, The third reference set value, the fourth reference set value, the second reference set value, and the first reference set value.

The TCSC may include a thyristor, a capacitor, a metal oxide varistor (MOV), and a circuit breaker connected in parallel with each other.

The TCSC is determined to be in a first mode when a current flowing through the thyristor and the capacitor is sensed and the TCSC is determined when a current flowing only through the capacitor of the thyristor and the capacitor is sensed. The controller determines that the TCSC is in the third mode when a current flowing only through the thyristor is detected in the thyristor and the capacitor, and determines that the TCSC is in the fourth mode when the current flowing to the circuit breaker is sensed Step < / RTI >

In the control device according to another embodiment of the present invention,

A control apparatus for a distance relay that protects a power system to which TCSC is applied, the apparatus comprising: a determination unit for determining an operation mode of the TCSC; A memory for storing a reference setting value corresponding to the determined operation mode; And a controller for changing the set value of the distance relay to the reference set value when the set value set in the distance relay is different from the reference set value.

The TCSC includes a thyristor, a capacitor, a metal oxide varistor (MOV) and a circuit breaker connected in parallel with each other, and the control device further includes a current sensing unit for sensing a current flowing in the thyristor, the capacitor, and the circuit breaker .

Some effects that can be achieved by a control apparatus and method of a power system distance relay including a TCSC according to an embodiment of the present invention are as follows.

i) It is possible to prevent malfunction of the distance relay.

ii) More efficient protection of the power system.

However, the effects of the apparatus and method for controlling the power system distance relay including the TCSC according to the embodiment of the present invention are not limited to those mentioned above, It will be understood by those skilled in the art that the present invention can be understood by those skilled in the art.

1 is a view showing a power system to which a control device according to an embodiment of the present invention is applied.
2 is a flowchart illustrating a method of controlling a distance relay by a control device according to an embodiment of the present invention.
Fig. 3 (a) is a diagram showing the configuration of the TCSC shown in Fig. 1, and Fig. 3 (b) is a graph showing the reactance of the TCSC according to the control angle of the TCSC.
4 is an RX diagram showing a Zone 1 protection area of a distance relay in a state where TCSC is not applied to the power system.
5A is an RX diagram showing a Zone 1 protection area of a distance relay when the TCSC operates in the first capacitive reactance boost mode, and FIG. 5B is a diagram illustrating a case where the TCSC operates in the first capacitive reactance boost mode Fig. 5 is a diagram showing the current flow in the case of Fig.
6 (a) is an RX diagram showing a Zone 1 protection area of a distance relay when the TCSC operates in a second capacitive reactance boost mode, and Fig. 6 (b) Fig. 5 is a diagram showing the current flow in the case of Fig.
FIG. 7A is an RX diagram showing a Zone 1 protection area of a distance relay when the TCSC operates in the TCR block mode, FIG. 7B is a diagram showing the current flow when the TCSC operates in the TCR block mode to be.
FIG. 8A is an RX diagram showing a Zone 1 protection area of a distance relay when the TCSC operates in the TCR bypass mode, and FIG. 8B shows a current flow when the TCSC operates in the TCR bypass mode Fig.
9A is an RX diagram showing a Zone 1 protection area of the distance relay when the TCSC operates in the circuit breaker bypass mode, and FIG. 9B is a diagram showing the RX diagram when the TCSC operates in the circuit breaker bypass mode Fig.
10A is a table showing the parameters of the power system according to the operation mode of the TCSC. FIG. 10B is a table showing the electric parameters to the B substation according to the operation mode of the TCSC when a short- It is a graph showing the distance.
11 is a diagram showing an impedance trajectory of a short-circuit fault of a B substation when the TCSC is not installed in the power system, as viewed from the distance relay.
12 (a) is a view showing an impedance trace viewed from a distance relay in a B substation accident while the TCSC operates in a first capacitive reactance boost mode, and Fig. 12 (b) 5 is a view showing an impedance trajectory of a B relay substation when a set value of the relay is changed from a distance relay.
FIG. 13 (a) is a diagram showing an impedance trace viewed from a distance relay in a B-substation accident while the TCSC operates in a second capacitive reactance boost mode, and FIG. 13 (b) 5 is a view showing an impedance trajectory of a B relay substation when a set value of the relay is changed from a distance relay.
14 (a) is a diagram showing an impedance trace viewed from a distance relay in a B substation while a TCSC operates in a TCR block mode, and FIG. 14 (b) Fig. 8 is a view showing an impedance trajectory of a B relay substation viewed from a distance relay.
FIG. 15 (a) is a diagram showing an impedance trace viewed from a distance relay at a B substation while a TCSC operates in a TCR bypass mode, and FIG. 15 (b) Fig. 5 is a diagram showing an impedance trajectory as viewed from a distance relay.
16 (a) is a view showing an impedance trace viewed from a distance relay in a B substation while a TCSC is operating in a circuit breaker bypass mode, and FIG. 16 (b) Fig. 5 is a view showing an impedance trajectory of a B substation when a set value is changed, as viewed from a distance relay. Fig.
17 is a block diagram showing a configuration of a control apparatus according to an embodiment of the present invention.

While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. It is to be understood, however, that the intention is not to limit the invention to the specific embodiments, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. In addition, numerals (e.g., first, second, etc.) used in the description of the present invention are merely an identifier for distinguishing one component from another.

Also, in this specification, when an element is referred to as being "connected" or "connected" with another element, the element may be directly connected or directly connected to the other element, It should be understood that, unless an opposite description is present, it may be connected or connected via another element in the middle.

In addition, components referred to in this specification as 'units', 'modules', and the like refer to hardware components such as software, FPGA, or ASIC, and these components perform certain roles. However, the components are not limited to software or hardware. The component may be configured to reside on an addressable storage medium. Further, two or more components may be merged into one component, or one component may be divided into two or more functions according to a more refined function. In addition, each of the components to be described below may additionally perform some or all of the functions of the other components in addition to the main functions that the user is responsible for, and some of the main functions And may be performed entirely by components.

Hereinafter, exemplary embodiments according to the technical idea of the present invention will be described with reference to the drawings.

1 is a diagram showing a power system 10 to which a control apparatus 100 according to an embodiment of the present invention is applied.

1, a distance relay 20 and a TCSC 30 are located on a transmission line of the power system 10 and a distance relay 20 operates a circuit breaker CB1 when a fault occurs in the power system 10 Thereby cutting off the system 10.

The control apparatus 100 according to an embodiment of the present invention may be connected to the distance relay 20 and the TCSC 30. According to an embodiment, the control apparatus 100 according to an embodiment of the present invention includes a distance relay (20), or may be included in the TCSC (30). Alternatively, some of the configurations of the control apparatus 100 may be included in the distance relay 20, and the rest of the configurations may be included in the TCSC 30.

The controller 100 according to the embodiment of the present invention can prevent the distance relay 20 from malfunctioning in accordance with the operation mode of the TCSC 30. The concrete operation of the controller 100 will be described with reference to FIG. .

2 is a flowchart showing a control method of the distance relay 20 by the control apparatus 100 according to an embodiment of the present invention.

In step S210, the control device 100 determines the operation mode of the TCSC 30. The control apparatus 100 may receive information on the operation mode from the TCSC 30 and may determine the operation mode of the TCSC 30 according to an embodiment of the control apparatus 100 itself. The TCSC 30 can operate in at least four modes, and the operation mode of the TCSC 30 will be described later with reference to FIGS. 5 to 9. FIG.

In step S220, the control device 100 acquires a reference setting value corresponding to the operation mode of the TCSC 30. [ Here, the reference set value is a set value to be set for the distance relay 20, and there is a different reference set value for each operation mode of the TCSC 30.

The manager preliminarily sets a set value corresponding to the distance relay 20 in accordance with a judgment as to how to operate the distance relay 20, and the set value is expressed by an electric distance, that is, an impedance. For example, the setting value of the distance relay 20 can be set so that an accident in the B substation is recognized as an accident in the Zone 1 while installing the distance relay 20 in preparation for the occurrence of a fault in the B substation of FIG. However, since this set value is set based on the impedance from the distance relay 20 to the point of failure, if the TCSC 30 is present as shown in Fig. 1, the impedance itself changes and the distance relay 20 It does not work.

In step S230, the control device 100 changes the set value of the distance relay 20 to the reference set value when the current set value set in the distance relay 20 is different from the reference set value.

The control apparatus 100 according to the embodiment of the present invention changes the set value of the distance relay 20 in real time according to the operation mode of the TCSC 30 and thus can prevent malfunction of the distance relay 20, It is possible to more safely protect the battery 10.

Fig. 3 (a) is a diagram showing the configuration of the TCSC 30 shown in Fig. 1, and Fig. 3 (b) is a graph showing the reactance of the TCSC 30 according to the control angle of the TCSC 30. Fig.

3 (a), the TCSC 30 includes a thyristor 31, a capacitor 33, a metal oxide varistor (MOV) 34, and a circuit breaker 35 connected in parallel with each other. Ls (32) represents the inductive reactance of the thyristor (31). 3 (b), when the control angle of the thyristor 31 is 180 degrees, the capacitive reactance of the TCSC 30 becomes Xc (t) when the control angle of the thyristor 31 is 180 degrees. And between about 147 degrees and about 180 degrees, the capacitive reactance of the TCSC 30 has a value between Xc and 3Xc. Further, when the control angle becomes about 143 degrees or less, the inductive reactance of the TCSC 30 becomes dominant.

That is, in summary, when the reactance of the transmission line increases (when the TCSC 30 exhibits inductive reactance) or decreases (the TCSC 30 exhibits capacitive reactance) in accordance with the control angle of the thyristor 31 Time.

4 is a resistance-reactance (RX) diagram showing a zone 1 protection area of the distance relay 20 in a state where the TCSC 30 is not applied to the power system.

M is the transmission line viewed from the impedance side, the transmission line can be expressed as resistance R and inductive reactance X, and C1 represents Zone 1 protection area of 80% of short-circuit fault and 75% of ground fault relay .

The center and the radius of the Zone 1 protection area are determined by the following equation (1).

[Equation 1]

Center =

Radius =

In Equation (1), a represents the distance of Zone-1 protection interval in case of 85% short-circuit fault and 75% ground fault.

5A is an RX diagram showing a Zone 1 protection area of the distance relay 20 when the TCSC 30 operates in a first capacitive reactance boost mode and FIG. 30 are operating in the first capacitive reactance boost mode.

The first capacitive reactance boost mode is referred to as a capacitive reactance boost mode with a second capacitive reactance boost mode to be seen in Figures 6 (a) and 6 (b), which means that the TCSC 30 is capacitive It means that it operates in the direction of increasing the reactance. The first capacitive reactance boost mode is a mode in which the capacitive reactance of the TCSC 30 has a value between Xc and 3Xc and no current flows through the MOV 34. [ Referring to FIG. 5 (b), it can be seen that a current flows through the thyristor 31 and the capacitor 33, but no current flows through the MOV 34.

When the TCSC 30 operates in the first capacitive reactance boost mode, the capacitive reactance of the value between Xc and 3Xc is added to the transmission line, and therefore, as shown in Fig. 5 (a) The Zone 1 protection area has a circular shape between the original Zone 1 protection areas, that is, c2 to c3 smaller than the dotted line.

The center and the radius of the Zone 1 protection area of the distance relay 20 when the TCSC 30 operates in the first capacitive reactance boost mode are determined by the following equation (2).

&Quot; (2) "

Center =

Radius =

6A is an RX diagram showing a Zone 1 protection area of the distance relay 20 when the TCSC 30 operates in the second capacitive reactance boost mode and FIG. And the second capacitive reactance boost mode.

As shown in Fig. 6 (b), in the second capacitive reactance boost mode, it can be seen that a current flows in both the thyristor 31, the capacitor 33, and the MOV 34. As the current flows through the thyristor 31 and the capacitor 33, a capacitive reactance between Xc and 3Xc is added to the transmission line, and a current flows through the MOV 34, so that the resistance of Rmov is added to the transmission line .

As shown in Fig. 6 (a), it can be seen that the position of the transmission line has changed due to the influence of Rmov, and due to the capacitive reactance between Xc and 3Xc, the protection area of Zone 1 has a circular shape between c4 and c5 . ≪ / RTI >

The center of the Zone 1 protection region of the distance relay 20 when the TCSC 30 operates in the second capacitive reactance boost mode when the combined impedance of the capacitive reactance of Rmov and TCSC 30 is A + And the radius are determined by the following equation (3).

&Quot; (3) "

Center =

Radius =

7A is an RX diagram showing a Zone 1 protection area of the distance relay 20 when the TCSC 30 operates in the TCR block mode and FIG. Fig. 5 is a diagram showing the current flow when operating. Fig.

The TCR block mode is a mode in which no current flows through the thyristor 31, and it can be seen that a current flows only to the capacitor 33 as shown in Fig. 7 (b).

When the current flows only through the capacitor 33, only the capacitive impedance of Xc is added to the transmission line, and the Zone 1 protection area is reduced to c6, as shown in Fig. 7 (b).

At this time, the center and the radius of c6 are determined by the following equation (4).

&Quot; (4) "

Center =

Radius =

8A is an RX diagram showing a Zone 1 protection area of the distance relay 20 when the TCSC 30 operates in the TCR bypass mode and FIG. Mode in which the current flows when operating in the mode.

In the TCR bypass mode, only the inductive reactance of the thyristor 31 is added to the transmission line as a current flows in the thyristor 31 and does not flow in the capacitor 33. As shown in FIG. 8 (a), the position of the transmission line is changed due to Rmov, and the Zone 1 protection area is extended to c7. This is because the inductive reactance of the entire transmission line is increased, unlike the capacitive reactance boost mode and the TCR block mode.

When the combined impedance of the inductive reactance of Rmov and TCSC 30 is C + jD, the center and radius of c7 are determined by the following equation (5).

&Quot; (5) "

Center =

Radius =

9 (a) is an RX diagram showing a Zone 1 protection area of the distance relay 20 when the TCSC 30 operates in a circuit breaker bypass mode, and FIG. 9 (b) Fig. 7 is a diagram showing the current flow when operating in the bypass mode. Fig.

The circuit breaker bypass mode is a mode in which a current flows only to the circuit breaker 35. In this case, since there is no additional resistance or additional reactance by the TCSC 30 in the transmission line, as shown in Fig. 9 (a) , There is no change in the size of the zone 1 protection area, and the center and radius of c8 are expressed by Equation (1).

10A is a table showing the parameters of the power system according to the operation mode of the TCSC 30 and FIG. 10B is a table showing the operation mode of the TCSC 30 when a short circuit accident or a ground fault occurs in the B substation And the electric distance to the B substation according to the present invention.

The resistance of the transmission line when the TCSC 30 is not installed in the power system is 0.0012 and the reactance is 0.0204. The fixed fraction Xc in FIG. 10 (a) is a capacitive reactance fundamentally added to the transmission line to increase the capacitive reactance of the transmission line, and is independent of the capacitive reactance of the TCSC 30 according to the present invention. Since the fixed fraction Xc is added to the transmission line in the simulation according to the present invention, the capacitive reactance of the transmission line is increased irrespective of whether the TCSC 30 is installed in the transmission line.

0.0041 was added to the value of the capacitive reactance of the TCSC 30 in the first capacitive boost mode without MOV and a value of 0.0041 was added to the TCSC 30 in the second capacitive boost mode without MOV. 0.0041 and Rmov 0.0018 were added as the capacitive reactance values of the TCSC 30 and 0.00206 as the capacitive reactance values of the TCSC 30 in the TCR block mode. In the TCR bypass mode, 0.0029 was added as the value of the inductive reactance, and Rmov 0.0018 was added. In the circuit breaker bypass mode, it can be seen that no reactance or resistance increases except for the fixed fraction Xc.

10 (b) shows the electrical distances of Zone 1 protection zone, Zone 2 protection zone, and Zone 3 protection zone when short-circuiting elements and ground fault elements of B substation are present under the respective operation modes of FIG. 10 (a).

In the case where there is a short-circuit element of the B-substation, the electrical distance of the Zone 1 protection area is 20.6764 when the TCSC 30 is not installed, and the electrical distance of the Zone 1 protection area is 14.4982 in the circuit breaker bypass mode. This is because in the circuit breaker bypass mode, the fixed fraction Xc is added to the transmission line.

Comparing the circuit breaker bypass mode with the capacitive reactance boost mode and the TCR block mode shows that the electrical distance of the Zone 1 protection zone is shorter than that of the circuit breaker bypass mode in capacitive reactance boost mode and TCR block mode Able to know. Also, when comparing the circuit breaker bypass mode and the TCR bypass mode, it can be seen that the electrical distance of the Zone 1 protection area is longer than that of the circuit breaker bypass mode in the TCR bypass mode.

The distance of the zone 1 protection area to the B substation when the TCSC 30 is not installed is 20.6746. However, the Zone 1 protection zone to the B substation when the TCSC 30 operates in the capacitive reactance boost mode and the TCR block mode, The shorter distance means that the distance relay 20 operates in an over-reach state. In other words, without considering the installation of the TCSC 30, if the manager inputs 20.6746 as the set value in order to allow the distance relay 20 to operate as Zone 1 in response to a short circuit of the B substation, In case of a short-circuit accident, the distance relay 20 should recognize and operate as a Zone 2 accident. However, when the TCSC 30 operates in the capacitive reactance boost mode or the TCR block mode, the electrical distance to the B substation is shortened, so that even if a short-circuit accident occurs farther from the B substation, the electrical distance may be smaller than 20.6746 , Zone 1 accident.

Conversely, when the TCSC 30 operates in the TCR bypass mode, the distance relay 20 operates under-reach.

The control device 100 according to an embodiment of the present invention may include a reference setting corresponding to each of a first capacitive reactance boost mode, a second capacitive reactance boost mode, a TCR block mode, a TCR bypass mode, and a circuit breaker bypass mode, The electrical distance value is set to the distance relay 20 so that the distance relay 20 always recognizes the same position regardless of the operation mode of the TCSC 30.

As shown in FIG. 10B, the electrical distances according to the respective protection areas are reduced in the order of the TCR bypass mode, the circuit breaker bypass mode, the second capacitive reactance boost mode, the TCR block mode, and the first capacitive reactance boost mode , The reference set value for the distance relay 20 also becomes smaller in this order.

11 shows an impedance trace viewed from the distance relay 20 when a TCSC 30 is not installed in the power system, and a short-circuit accident of the B substation is represented by Zone 2 .

12 to 16 are diagrams showing impedance traces of the B substation short-circuit fault (Fig. 12 (a), Fig. 13 (a) and Fig. 13 (b)) when the control apparatus 100 according to the present invention does not exist for each operation mode of the TCSC 30, The impedance of the B substation short-circuit fault when the set value of the distance relay 20 is changed by the control apparatus 100 according to the present invention is shown in Fig. 14 (a), Fig. 15 (a) (FIG. 12 (b), FIG. 13 (b), FIG. 14 (b), FIG. 15 (b), and FIG. 16 (b).

Figure 12 shows that when the TCSC 30 is operating in the first capacitive reactance boost mode, Figure 13 shows that when the TCSC 30 is operating in the second capacitive reactance boost mode, Figure 14 shows that the TCSC 30 is operating in the second capacitive reactance boost mode, Figure 15 shows when the TCSC 30 is operating in the TCR bypass mode and Figure 16 shows when the TCSC 30 is operating in the circuit breaker bypass mode.

12 to 16, when the set value of the distance relay 20 is not changed in all the operation modes of the TCSC 30, it can be seen that a short circuit fault of the B substation converges to the Zone 2, 20) is changed, it can be seen that the short circuit fault of B substation converges to Zone 1. That is, the overrange operation of the distance relay 20 is normally restored. 15 and 16, the reason why the distance relay 20 performs the overreach operation is that the stationary Xc is added to the power transmission line and simulated as described above.

17 is a block diagram showing a configuration of a control device 1700 according to an embodiment of the present invention.

The control device 1700 according to an embodiment of the present invention may include a determination unit 1710, a memory 1730, and a control unit 1750.

The determination unit 1710 determines the operation mode of the TCSC 30. The determination unit 1710 may determine the operation mode of the TCSC 30 to be one of a capacitive reactance boost mode, a TCR block mode, a TCR bypass mode, and a circuit breaker bypass mode. The capacitive reactance boost mode can further refine the capacitive reactance boost mode by further considering, for example, whether the current flows to the MOV 34 or the control angle of the thyristor 31, and the like.

The memory 1730 stores a reference setting value corresponding to the operation mode determined by the determination unit 1710. [

The controller 1750 sets the set value currently set in the distance relay 20 to the reference set value when the reference set value corresponding to the operation mode of the TCSC 30 is different from the set value set in the distance relay 20 Change it.

Although not shown in FIG. 17, the control device 1700 according to an embodiment of the present invention may further include a current sensing unit. The current sensing unit senses the current flowing through the thyristor 31, the capacitor 33 and the circuit breaker 35 of the TCSC 30. The current sensing unit may be included in the TCSC 30 in the form of a current sensing device and may receive information on whether a current flows from the TCSC 30 to the thyristor 31, the capacitor 33 and the circuit breaker 35 You may.

Meanwhile, the embodiments of the present invention described above can be written in a program that can be executed in a computer, and the created program can be stored in a medium.

The medium may be a storage such as a magnetic storage medium (e.g., ROM, floppy disk, hard disk, etc.), an optical reading medium (e.g. CD ROM, DVD, etc.) and a carrier wave Media, but is not limited thereto.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention as defined by the following claims. You will understand. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive.

10: Power system
20: Distance Relay
30: TCSC
100, 1700: Control device
1710:
1730: Memory
1750:

Claims (7)

A method of controlling a distance relay protecting a power system to which a Thyristor-Controlled Series Capacitor (TCSC) is applied,
Determining an operation mode of the TCSC;
Obtaining a reference set value corresponding to the determined operation mode; And
And changing the set value of the distance relay to the reference set value when the set value set in the distance relay differs from the reference set value.
The method according to claim 1,
The operation mode of the TCSC includes:
A first mode which is a capacitive reactance boost mode, a second mode which is a Thyristor-Controlled Reactor (TCR) block mode, a third mode which is a TCR bypass mode, and a fourth mode which is a circuit breaker bypass mode Control method of relay.
3. The method of claim 2,
A first reference setting value corresponding to the first mode, a second reference setting value corresponding to the second mode, a third reference setting value corresponding to the third mode, and a fourth reference setting value corresponding to the fourth mode,
The third reference setting value, the fourth reference setting value, the second reference setting value, and the first reference setting value.
3. The method of claim 2,
The TCSC,
A capacitor, a metal oxide varistor (MOV), and a circuit breaker connected in parallel with each other.
5. The method of claim 4,
The step of determining the operation mode of the TCSC includes:
If the current flowing through the thyristor and the capacitor is sensed, the TCSC is determined as the first mode,
Wherein the controller determines that the TCSC is in the second mode when a current flowing only through the capacitor of the thyristor and the capacitor is sensed,
Wherein the controller determines that the TCSC is in the third mode when a current flowing only through the thyristor among the thyristor and the capacitor is sensed,
And determining that the TCSC is in a fourth mode when a current flowing to the circuit breaker is sensed.
A control apparatus for a distance relay which protects a power system to which TCSC is applied,
A determination unit for determining an operation mode of the TCSC;
A memory for storing a reference setting value corresponding to the determined operation mode; And
And a controller for changing the set value of the distance relay to the reference set value when the set value set in the distance relay is different from the reference set value.
The method according to claim 6,
The TCSC includes a thyristor, a capacitor, a metal oxide varistor (MOV), and a circuit breaker connected in parallel with each other,
The control device includes:
And a current sensing unit for sensing a current flowing through the thyristor, the capacitor, and the circuit breaker.

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