KR101736256B1 - Apparatus and method for calculating contribution ratio of fault current - Google Patents

Apparatus and method for calculating contribution ratio of fault current Download PDF

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KR101736256B1
KR101736256B1 KR1020150136771A KR20150136771A KR101736256B1 KR 101736256 B1 KR101736256 B1 KR 101736256B1 KR 1020150136771 A KR1020150136771 A KR 1020150136771A KR 20150136771 A KR20150136771 A KR 20150136771A KR 101736256 B1 KR101736256 B1 KR 101736256B1
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fault
source
current
contribution
failure
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KR20170037323A (en
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고백경
이재걸
송지영
한상욱
최장흠
신정훈
안용호
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한국전력공사
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R11/00—Electromechanical arrangements for measuring time integral of electric power or current, e.g. of consumption
    • G01R11/02—Constructional details
    • G01R11/25—Arrangements for indicating or signalling faults
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R21/00—Arrangements for measuring electric power or power factor
    • G01R21/06—Arrangements for measuring electric power or power factor by measuring current and voltage

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Abstract

The present invention relates to an apparatus and a method for calculating a fault current contribution ratio capable of calculating and providing a contribution rate of each fault source to a fault fault point when a fault occurs in a power system. An information input unit for receiving power system information for a plurality of generators, a transmission / reception facility, and a load constituting the power system of the present invention; At least one failure source to be evaluated among a plurality of generators, a transmission / reception apparatus and a load, and a fault setting unit for setting a high advantage to at least one bus line among the bus lines included in the power system; A fault current inflow analyzing unit for calculating a fault current inflow amount for each fault occurrence source which is set to a high level through a fault setting unit; And a contribution ratio evaluating unit for calculating a failure current contribution ratio for each failure source using the failure current inflow amount for each failure source.

Description

[0001] APPARATUS AND METHOD FOR CALCULATING CONTRIBUTION RATIO OF FAULT CURRENT [0002]

The present invention relates to an apparatus and a method for calculating a fault current contribution rate, and more particularly, to a fault current calculation apparatus and method for estimating a fault current contribution rate by calculating a contribution rate of each fault source to a fault point, To an apparatus and method for calculating contribution ratios.

The breakdown current is a mathematical expression of the magnitude of the current on the circuit breaker when a power system breaks down or when a fault occurs in the substation. Specifically, the fault current indicates that a very large current flows instantaneously at the fault point as the electric potential at the fault point becomes low, the electric current flows instantaneously from the generator or the like around the fault point, .

The increase in the fault current in the event of a fault not only adversely affects the integrity of the individual power plant, but also increases the possibility of additional accidents by breaking the insulation ability of the circuit breaker and losing its ability to block if the fault current exceeds the fault capacity of the circuit breaker . Accordingly, the fault current is a very important factor that must be accurately interpreted in terms of power system facilities protection.

Especially, in the metropolitan area, large-scale power generation complexes are concentrated, and power is supplied by a large number of north-runways. In addition, resistance elements (impedances) between the fault points and the generators are very small when a failure occurs due to the double loop of the grid inside the capital region. Therefore, the fault current flowing from the generator in the event of a fault is very large, which is continuously increasing.

In order to avoid the problem of this fault current, a method of separating the internal bus line in the substation and replacing the large capacity circuit breaker is applied in a short period of time. However, in the case of the bus disconnecting operation, when the transformer fails, the bus connection can not be established immediately, which lowers the reliability of the power supply, and the replacement with a large capacity circuit breaker (63 kA) involves a very high cost.

7. FIG. 7 is a conceptual diagram for illustrating the fault calculation limit according to the conventional technique. The conventional fault calculation is limited to calculating and showing the fault current flowing from the substation near the fault point to the fault point in the event of fault. In other words, since the conventional method has no function of analyzing the fault current from the generator, which is the cause of the fault current, to the fault point, there is a limitation in the overall analysis of the cause of the fault current generation and increase .

Korean Unexamined Patent Publication No. 2005-0091916 (Off-line state evaluation system and method for large-scale power system)

The present invention provides an apparatus and method for calculating a fault current contribution ratio that can quantitatively provide a resultant value by evaluating a fault current and a fault current contribution factor for each fault current source affecting a fault point when a fault occurs in a power system .

An information input unit for receiving power system information for a plurality of generators, a power transmission / reception facility, and a load constituting the power system of the present invention; At least one failure source to be evaluated among a plurality of generators, a transmission / reception apparatus and a load, and a fault setting unit for setting a high advantage to at least one bus line among the bus lines included in the power system; A fault current inflow analyzing unit for calculating a fault current inflow amount for each fault occurrence source which is set to a high level through a fault setting unit; And a contribution ratio evaluating unit for calculating a failure current contribution ratio for each failure source using the failure current inflow amount for each failure source.

Also, the contribution rate evaluator can estimate the contribution of each fault source using the current base and the fault current inflow for each fault source.

Also, the contribution ratio evaluation unit can calculate the contribution ratio of the fault current to each fault source by calculating the ratio of the contribution fault current to each fault source and the contribution fault current per fault source.

The contribution rate evaluator can also check the operating state variables for each fault source based on the power system information and calculate the fault current contribution rate only for the fault sources identified as operating.

The fault current inflow analyzing unit includes a first circuit that constitutes an equivalent circuit for the line between the high potential and the fault current source set through the fault setting unit and includes an equivalent circuit only in the negative direction of the high- And the second circuit including the remaining voltage sources excluding the voltage source. By analyzing the first circuit and the second circuit, it is possible to calculate the inflow amount of the fault current for each fault source.

The apparatus may further include an output unit for outputting a failure source and a contribution rate for each failure source.

In addition, the contribution rate evaluator can convert the fault current inflow per fault source into units of pu (per unit), and calculate the fault current contribution factor by the fault source using the converted value in pu units.

According to another aspect of the present invention, there is provided a fault current contribution rate calculating method comprising the steps of: receiving power grid information for a plurality of generators, a transmission / Setting a high advantage on at least one bus line of at least one of a plurality of generators, a transmission / reception facility, and at least one failure source to be evaluated among loads and a bus line included in the power system by the failure setting unit; Calculating a fault current inflow amount for each fault occurrence source flowing into the high fault through the fault setting unit by the fault current inflow amount analyzing unit; And a contribution rate evaluating unit for calculating a failure current contribution ratio for each failure source by using the failure current inflow amount for each failure source.

Also, the step of calculating the fault current contribution ratio for each fault occurrence source includes: calculating a current base for the high fault; And calculating a contribution fault current for each of the fault sources using the current base and the fault current inflow for each fault source.

Also, the step of calculating the contribution rate of the fault current to each fault source can be performed by calculating the sum of the contribution fault currents to the respective fault sources and the contribution fault currents of the sources of the faults according to the source of the fault.

Also, the step of calculating the fault current contribution ratio according to the source of the fault can check the operation state variable for each fault source based on the power system information, and calculate the fault current contribution ratio only for the fault source identified as being in operation.

Also, the step of calculating the fault current inflow for each fault source constitutes an equivalent circuit for the line between the high fault and the fault current source set in the step of setting the high fault, and the equivalent circuit is set in the negative direction A first circuit including only a voltage source disposed therein, and a second circuit including a voltage source other than the voltage source, and can be realized by analyzing the first circuit and the second circuit.

In addition, the fault current contribution rate calculation method according to an embodiment of the present invention may further include outputting a contribution rate by a fault source and a fault source by an output unit.

According to the apparatus and method for calculating the contribution current of a fault current according to the present invention, unlike the prior art, which is limited to calculating the magnitude and phase of a fault current flowing into a fault point when a power system fault occurs, By providing the fault current size and the contribution ratio quantitatively to the manager, it is possible to overcome the technical limit of the existing result and to utilize it in establishing the fundamental fault current reduction plan based on this.

Further, according to the apparatus and method for calculating the fault current contribution rate of the present invention, it is possible to quantitatively analyze the cause of the fault current magnitude of the new generator when the rated capacity of the substation is exceeded due to the new construction- Therefore, there is an effect that an economic countermeasure can be established by calculating and applying a penalty cost for switching the breaker.

1 is a block diagram of an apparatus for calculating a fault current contribution rate according to an embodiment of the present invention.
2 and 3 are circuit diagrams illustrating a method of calculating a fault current inflow through a fault current inflow analyzing unit according to an embodiment of the present invention.
4 is a block diagram of a contribution ratio evaluating unit according to an embodiment of the present invention.
5 is a flowchart illustrating a method of calculating a fault current contribution rate according to an embodiment of the present invention.
FIG. 6 is a flowchart illustrating a step of calculating the fault current contribution ratio for each fault source according to an embodiment of the present invention.
FIG. 7 is a conceptual diagram for illustrating the fault calculation limit according to the conventional technique.

The present invention will now be described in detail with reference to the accompanying drawings. Hereinafter, a repeated description, a known function that may obscure the gist of the present invention, and a detailed description of the configuration will be omitted. Embodiments of the present invention are provided to more fully describe the present invention to those skilled in the art. Accordingly, the shapes and sizes of the elements in the drawings and the like can be exaggerated for clarity.

Hereinafter, an apparatus 100 for calculating a fault current contribution rate according to an embodiment of the present invention will be described.

1 is a block diagram of an apparatus 100 for calculating a fault current contribution rate according to an embodiment of the present invention. As described above, the fault current contribution ratio calculation apparatus 100 according to the embodiment of the present invention evaluates the fault current and fault current contribution ratio affecting the fault point when the fault occurs in the power system, And to provide it quantitatively.

Here, the failure current contribution rate is a numerical value showing the effect of a plurality of fault current sources on the fault current at a specific fault point, and represents the ratio of the inflow current flowing from each fault current source to the total fault current. An apparatus 100 for calculating a fault current contribution rate according to an embodiment of the present invention includes an information input unit 110, a fault setting unit 120, a fault current inflow amount analyzing unit 130, 140, a contribution rate evaluation unit 150, and an output unit 160. Here, the information input unit 110, the fault setting unit 120, the fault current inflow amount analyzing unit 130, the judging unit 140, and the contribution rate evaluating unit 150 are classified into respective components in order to facilitate understanding of the present invention. Points should be understood. That is, the information input unit 110, the fault setting unit 120, the fault current inflow analyzing unit 130, the judging unit 140, and the contribution rate evaluating unit 150 may be one unit such as a central processing unit (CPU) It should be understood that implementation via the processor is also possible. Hereinafter, each configuration included in the fault current contribution ratio calculation apparatus 100 according to an embodiment of the present invention will be described.

The information input unit 110 receives information on the power system from the storage unit 10. Specifically, the information input unit 110 receives power system information for a plurality of generators, transmission / reception equipment, and loads constituting the power system from the storage unit 10. [

The failure setting unit 120 sets at least one failure source to be evaluated among the above-mentioned power system, that is, a plurality of generators, transmission / reception facilities and loads, and at least one of the buses included in the power system, Function. That is, the failure setting unit 120 functions to set an option used to calculate the failure current contribution ratio described below. For this purpose, the fault setting unit 120 can perform functions of setting the voltage and phase of the substation, data on the fault type, and a high advantage.

Here, the voltage of the bus and the phase of the bus can be set by calculating the voltage and phase of the bus with the PF method or the Flat method. Here, the PF method is a method of calculating and setting the bus voltage and phase based on the algae calculation, and the flat method is a method of performing calculation by setting the bus voltage to 1.0 pu and the phase to 0 °.

The fault type setting through the fault setting unit 120 is performed by setting at least one of fault types that can occur in the power system, such as three-phase short circuit, one-line ground fault, two-wire ground fault and line short circuit. The high-strength setting through the fault setting unit 120 may be performed by selecting at least one bus line to be faulty among a plurality of buses included in the power system. These buses can select not only a single bus but also a plurality of buses.

When the system information input through the above-described information input unit 110 and the setting process through the failure setting unit 120 are completed, the failure current inflow analysis unit 130 calculates the failure current inflow amount Is calculated. Here, the calculation method of the fault current inflow amount through the fault current inflow analyzing unit 130 can be performed by applying the principle of superposition. 2 and 3.

2 and 3 are circuit diagrams illustrating a method of calculating a fault current inflow through a fault current inflow analyzing unit 130 according to an embodiment of the present invention. The circuit diagram shown in Figs. 2 and 3 shows an exemplary circuit for explaining a method of calculating the fault current inflow in accordance with an embodiment of the present invention. That is, it should be understood that the circuit used for calculating the fault current inflow is not limited to the circuit shown in Figs. 2 and 3 only.

In Fig. 2, circuit 21 represents an exemplary circuit for a system in which a fault point is set. The fault current inflow analyzing unit 130 according to the embodiment of the present invention may be configured such that an equivalent circuit 22 having an equivalent fault state is provided to the circuit 21 by locating the pre- . That is, the fault current inflow analyzing unit 130 implements an equivalent circuit 22 for the circuit between the high-potential fault source and the fault current source via the fault setting unit 120, for the circuit 21. [

3, the fault current inflow analyzing unit 130 includes a second circuit 31 including the voltage sources other than the voltage sources disposed in the negative direction of the high-frequency side, And a first circuit 32 including only a voltage source arranged in the negative direction of the high-frequency characteristic is divided to perform analysis for each circuit.

Here, the second circuit 31 is in a state equivalent to the system state before the failure, and shows the load state of the system. The short-circuit current I G11 of high advantage in the second circuit 31 becomes zero. Accordingly, the high-strength current I F2 obtained by the first circuit 32 indicating the failure state becomes the total short-circuit current. In the faulted state, the current flowing through the system components other than the high power can be calculated by adding the load current of the second circuit 31 and the current of the first circuit 32. [ The voltage of each bus line in the first circuit can be calculated by the following equation (1).

Figure 112015093964124-pat00001

In Equation (1), the Z matrix of the left term denotes the bus impedance matrix of the system and Z ij denotes the (i, j) component of the bus impedance matrix. The vector multiplied by the left term signifies the current vector. The current injected into the f bus line corresponding to the failure point is a reverse connection of the high-potential pre-failure voltage. The current injection is expressed as 0 in addition to the current component flowing from the failure point of the first circuit 32. The right term in Equation (1) represents the voltage of each bus line in the first circuit (32), and -Vf represents the voltage at the high potential. Referring again to FIG.

The determination unit 140 determines whether the analysis process through the failure current inflow analysis unit 130 is completed for the single or multiple buses set through the failure setting unit 120. [ That is, the fault current inflow analyzing unit 130 calculates the inflow amount by dividing the fault current into the fault occurrence sources, and thus functions to determine whether each calculation process is completed.

The contribution ratio evaluating unit 150 calculates the contribution ratio of the fault current to each fault source using the fault current inflow calculated by the fault current inflow analyzer 130. That is, as described above, the contribution ratio evaluating unit 150 calculates the contribution ratio of the fault current to each fixed current source in order to quantitatively evaluate the contribution of the fault current to each fault source. The contribution rate of each fault current source through the contribution ratio evaluation unit 150 is calculated as follows.

First, the contribution ratio evaluating unit 150 functions to check an operating state variable for each failure source based on the power system information input through the information input unit 110. [ That is, the contribution rate calculation through the contribution rate evaluating unit 150 according to the embodiment of the present invention is performed only for the failure source identified as being in operation, and the contribution rate is calculated for the failure source that is not in operation It does not. Accordingly, the fault current contribution rate calculation apparatus 100 according to an embodiment of the present invention does not perform a separate contribution rate calculation, and thus has an advantage of saving system resources.

Then, the contribution ratio evaluating unit 150 calculates the contribution ratio using the voltage and current of the respective busbars derived through the failure current inflow analyzing unit 130, that is, It functions to convert the current generated from the fault current source, that is, the fault current inflow, to the pu value.

Then, the contribution rate evaluating unit 150 calculates a high-strength current base to calculate how much the current generated from the source of the fault current has a high advantage. Here, the current base can be expressed by the following equation (2).

Figure 112015093964124-pat00002

In Equation (2), I base (A) represents a current base. Using Equation (2), the current base used to calculate the contribution fault current can be calculated.

Then, the contribution rate evaluating unit 150 calculates the contribution failure current for each failure source by using the current base and the failure current inflow per failure source. Here, the method of calculating the contribution failure current can be expressed as Equation (3) below.

Figure 112015093964124-pat00003

In Equation (3), i represents the number of the fault current sources identified as being in operation as described above, I base (A) represents the current base, and I G ( pu ) represents the fault current inflow converted into pu units. That is, the contribution failure current for each fault current source can be calculated as the product of the current base and the fault current inflow.

Then, the contribution rate evaluating unit 150 calculates the contribution ratio of the fault current to each fault source by calculating the ratio of the contribution fault current to the fault source and the contribution fault current per fault source. That is, the calculation method of the fault current contribution ratio for each fault source through the contribution ratio evaluating unit 150 can be expressed as Equation (4).

Figure 112015093964124-pat00004

The determination unit 140 further performs a function of determining whether all the analysis processes for the single or multiple buses calculated through the contribution rate evaluation unit 150 through the contribution rate evaluation unit 150 have been completed. Similarly to the fault current inflow analyzing unit 130, the contribution ratio evaluating unit 150 calculates the contribution ratio by dividing the failure source into fault sources, and therefore, it is determined whether each of the calculation processes is completed. As a result of the determination by the determination unit 140, if there are more fault sources that need further analysis, the above-described process through the contribution rate evaluation unit 150 is performed again. When all the calculation processes are completed, the failure current and the contribution rate for each fault current source are output to the single or multiple buses selected through the output unit 160. An example of the result output through the output unit 160 is shown in Table 1 below.

Fault bus: 1100, new game 3 Generator number Generator name Contributing current (A) Phase (deg) Contribution Rate (%) 25157 Shinhan Wool 1G 1342.9 -89.19 2.4 25158 Shinhan Wool 2G 1342.9 -89.19 2.4 25159 Shinhan Wool 3G 1342.9 -89.19 2.4 25160 Shinhan Wool 4G 1342.9 -89.19 2.4 25155 Hanul 5G 978.04 -89.04 1.75 ... ... ... ... ...

As shown in Table 1, through the output unit 160 according to an exemplary embodiment of the present invention, the contribution failure current and contribution ratio for each failure source may be output, and the corresponding data may be provided to the user. That is, according to the fault current contribution rate calculation apparatus 100 according to an embodiment of the present invention, the contribution fault current and contribution rate for each fault source can be quantitatively calculated, and the calculated data can be quantitatively provided to the user There are advantages to be able to.

Also, according to another embodiment of the present invention, the fault current contribution rate calculation apparatus can calculate the fault current average contribution rate of the fault current sources. That is, it is possible to calculate the average fault current contribution ratio by dividing the fault current generation source group by the fault current contribution ratio calculation algorithm and the output result of the system. The output of this is shown in Table 2 below.

Fault bus: 1100, new game 3 Generator name Total contribution current (A) Average Contribution Rate (%) Shinhan Wool 5376.6 9.6 Hanul 4065.1 8.6 ... ... ...

In addition, the apparatus for calculating the contribution of the fault current according to another embodiment of the present invention may calculate the fault current contribution ratio of the fault current source and output it. An example of this can be shown in Table 3.

Fault bus: 1100, new game 3 Area code Local people Total contribution current (A) Average Contribution Rate (%) 56 Gangwon 21,478 41 55 game 15,531 30 ... ... ... ...

FIG. 4 is a block diagram of a contribution ratio evaluating unit 150 according to an embodiment of the present invention. As described above, the contribution rate evaluating unit 150 according to the embodiment of the present invention calculates the contribution fault current and the fault current contribution rate for each fault source by using the fault current inflow for each fault source. The contribution rate evaluating unit 150 according to an embodiment of the present invention includes an operating state variable checking module 151, a unit converting module 152, a current base calculating module 153, a contribution fault current calculating module 154, And a fault current contribution rate calculating module 155. [ Hereinafter, the configurations included in the contribution rate evaluating unit 150 according to an embodiment of the present invention will be described.

The operating state variable checking module 151 functions to check operating state variables for each failure source based on the power system information input through the information input unit. As described above, the fault current contribution rate calculation apparatus 100 according to an embodiment of the present invention identifies a fault source in operation based on the power grid information, rather than estimating the contribution rate for all of the fault sources, The fault contributing current and the contribution rate, which will be described below, are calculated only for the fault source identified as the fault source.

The unit conversion module 152 converts the current generated in the fault current source calculated through the calculation method described with reference to Equation 1, that is, the inflow amount of the fault current according to the fault source into the unit of pu.

The current-based estimation module 153 functions to estimate the current-based base used to calculate the contributing-fault current and the fault-current contribution ratio, which will be described below. The description thereof has been given with reference to Equation (2) above, so that further explanation is omitted.

The contribution fault current calculation module 154 multiplies the current base estimated through the current base calculation module 153 by the fault current inflow per fault source converted by the unit through the unit conversion module 152, It functions to calculate the current.

The fault current contribution ratio calculation module 155 calculates the fault current contribution ratio by the fault source by calculating the sum of the contribution fault currents to the fault sources and the contribution fault currents of the respective fault sources according to the fault sources. Since the above description is made with reference to Equation (4) above, further explanation is omitted.

When the calculation of the contribution rate is completed through the failure current contribution rate calculation module 155, the control is transmitted to the determination unit 140. As a result of the determination by the determination unit 140, if there are more fault sources that require further analysis, the contribution fault current and contribution ratio for the fault source are further calculated through the above-described configuration. Otherwise, the determination unit 140 transmits the data to the output unit 160 to control the values to be output to the user.

5 is a flowchart illustrating a method of calculating a fault current contribution rate according to an embodiment of the present invention. As described above, the fault current contribution ratio calculation method according to the embodiment of the present invention estimates the fault current and fault current contribution ratio affecting the fault point when the fault occurs in the power system, and provides the result quantitatively . Hereinafter, a fault current contribution rate calculation method according to an embodiment of the present invention will be described with reference to FIG. For reference, the elements overlapping with those described with reference to Figs. 1 to 4 are omitted for the sake of explanation.

First, a step (S110) of receiving power system information for a plurality of generators, a transmission / reception facility, and a load constituting the power system is performed by the information input unit. In the step S110, for example, the power system information may be loaded from the storage unit.

Thereafter, the fault setting unit sets the bus voltage and phase (S120). Here, the step S120 may be performed by calculating the voltage and phase of the bus line by the PF method or the Flat method. As described above, the PF method calculates the voltage and phase of the bus based on the algae calculation, and the flat method calculates the voltage by setting the bus voltage to 1.0pu and the phase to 0 °. .

Setting a high advantage to at least one of the plurality of generators, the transmission / distribution facility, and at least one of the busbars included in the power system, and at least one failure source to be evaluated in the load by the failure setting unit S130). In addition, in step S130, the fault type may further include setting a fault type, for example, a three-phase short circuit, a one-line ground fault, a two-wire ground fault, and a line fault.

Thereafter, the fault current inflow amount analyzing unit calculates a fault current inflow amount for each fault source, which is set through the fault setting unit, in step S140. Here, the calculation process performed in step S140 may be performed by, for example, applying the principle of superposition. That is, the step S140 includes a first circuit which constitutes an equivalent circuit for the line between the high-potential and the fault current source set through the step S130, and which includes only the voltage source arranged in the negative direction of the high-potential equivalent circuit, And a second circuit including the remaining voltage sources, and can be realized by analyzing the first circuit and the second circuit. The description thereof has been made in detail with reference to FIGS. 2, 3 and 1, and further explanation is omitted.

Thereafter, the determination unit determines whether the failure current inflow amount analysis is completed (S150). As described above, since the inflow amount is calculated by dividing each fault source, it is determined whether each calculation process has been completed. As a result of the determination in step S150, if there is an unfinished failure source, control passes to step S155 to change the high priority, and the process returns to step S140 and the above-described analysis process is performed. Otherwise, control passes to step S160.

In operation S160, the contributing rate evaluating unit calculates a fault current contribution rate for each of the fault sources using the fault current inflow amount derived from the fault source derived in operation S140. As described above, first, in operation S160, the operating state variable for each fault source is checked based on the power system information, and the fault current contribution ratio can be calculated only for the fault source identified as being in operation.

In step S160, the fault current inflow calculated by the fault source calculated in step S140 is converted into pu units, the current base for the high fault is calculated, and based on the current base and the fault current inflow converted into the pu unit, It is possible to calculate the star-attributed fault current. In addition, in step S160, the contribution ratio of the fault current to the source of the fault can be calculated by calculating the sum of the contribution fault currents to the fault source and the contribution fault current for each source of the fault. When the calculation of the fault current contribution rate is completed, control is transferred to step S170.

In step S170, it is checked whether contribution rate analysis for each failure source is completed for a single or multiple buses selected or set through step S130. As a result of checking in step S170, if it is determined that the contribution rate evaluation is completed, the control is transferred to step S180. Otherwise, the control is transferred to step S175 to perform the high-strength change, and then control is passed to step S160 to re-execute the above-described procedure.

Step S180 is a step of outputting, by the output unit, the failure source, the contribution failure current for each failure source, and the contribution ratio. Since the example output through step S180 has been described with reference to Tables 1 to 3, a further explanation will be omitted.

FIG. 6 is a flowchart illustrating a step of calculating the fault current contribution ratio for each fault source according to an embodiment of the present invention. Hereinafter, the step of calculating the fault current contribution ratio is further described with reference to Fig.

First, the contribution rate evaluating unit (S161) of checking the operating state variables for each failure source based on the power system information input through the information input unit is performed. The reason that step S161 is performed is to perform the contribution rate calculation mentioned below only for the fault sources that are confirmed to be in operation, rather than calculating the contribution rate for all of the fault sources.

Thereafter, the contributing rate evaluating unit performs a step (S162) of converting the fault current inflow amount per fault source into the unit of pu.

Then, by the contribution rate evaluating unit, step (S163) of calculating the current base used to calculate the contribution failure current and the failure current contribution ratio described below is performed. Since the method of calculating the current base through step S163 has been mentioned above with reference to equation (2), a further explanation is omitted.

Thereafter, in step S164, the contributing rate evaluating unit calculates a contributing failure current for each failure source based on the current base calculated in step S163 and the failure current inflow amount for each failure source converted by the unit through step S162 .

Then, the contributing rate evaluating unit calculates a contribution ratio of the contribution current to the source of the failure source and a contribution failure current for each source of the failure for each failure source, thereby calculating the failure current contribution ratio for each failure source (S165) do.

Thereafter, by the contribution rate evaluating unit, the contribution failure current and the failure current contribution ratio estimated through steps S164 and S165 may be transmitted to the storage unit (S166).

As described above, an optimal embodiment has been disclosed in the drawings and specification. Although specific terms have been employed herein, they are used for purposes of illustration only and are not intended to limit the scope of the invention as defined in the claims or the claims. Therefore, those skilled in the art will appreciate that various modifications and equivalent embodiments are possible without departing from the scope of the present invention. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims.

100: Failure current contribution rate calculation device
110: Information input unit 120: Fault setting unit
130: Failure current inflow rate analyzer 140:
150: Contribution ratio evaluation unit 160: Output unit

Claims (13)

An information input unit for receiving power system information for a plurality of generators, a transmission / reception facility, and a load constituting a power system;
At least one failure source to be evaluated among the plurality of generators, the transmission / reception equipment and the load, and a failure setting unit for setting a high advantage on at least one bus among the buses included in the power system;
A fault current inflow amount analyzer for calculating a fault current inflow amount of each fault occurrence source flowing into the high fault through the fault setting unit; And
And a contribution rate evaluating unit for calculating a failure current contribution rate for each of the failure sources using the failure current inflow amount for each failure source,
Wherein the contribution rate evaluating unit comprises:
Calculating a current base for the high advantage and calculating a contribution fault current for each of the fault sources using the current base and the fault current inflow for each fault source. delete The method according to claim 1,
Wherein the contribution rate evaluating unit comprises:
Wherein the fault current contribution ratio is calculated by calculating a sum of the contribution fault currents for the respective fault sources and a contribution fault current for each fault source according to the fault sources. The method according to claim 1,
Wherein the contribution rate evaluating unit comprises:
And calculates a fault current contribution ratio only for a fault source identified as being in operation, by checking an operating state variable for each fault source based on the power system information. The method according to claim 1,
The fault current inflow amount analyzing unit,
A first circuit which constitutes an equivalent circuit for a line between the high potential set by the fault setting unit and the fault source and includes only the voltage source arranged in the negative direction of the high-potential equivalent circuit; And a second circuit including a voltage source, and calculates a fault current inflow by the fault source by interpreting the first circuit and the second circuit. The method according to claim 1,
Further comprising an output unit for outputting the failure source and the contribution ratio for each failure source. The method according to claim 1,
Wherein the contribution rate evaluating unit comprises:
Wherein the fault current contribution ratio is calculated by converting the fault current inflow amount per fault source into units of pu (per unit), and using the value converted into the pu unit, the fault current contribution factor for each fault source. Receiving power system information for a plurality of generators, a transmission / reception facility, and a load constituting a power system by an information input unit;
Setting at least one failure source to be evaluated among the plurality of generators, the transmission and reception equipment and the load by the failure setting unit, and setting a high advantage on at least one of the buses included in the power system;
Calculating a fault current inflow amount for each fault occurrence source flowing into the faulty fault set through the fault setting unit by the fault current inflow amount analysis unit; And
And a contribution rate evaluating unit for estimating a fault current contribution factor for each fault source using the fault current inflow amount for each fault source,
The step of calculating the fault current contribution ratio for each fault source includes:
Estimating a current base for the high advantage; And
Calculating a contribution fault current for each of the fault sources using the current base and the fault current inflow for each fault source. delete 9. The method of claim 8,
The step of calculating the fault current contribution ratio for each fault source includes:
Wherein the sum of the contribution failure currents for each failure source and the contribution failure current for each failure source are calculated as a ratio. 9. The method of claim 8,
The step of calculating the fault current contribution ratio for each fault source includes:
And determining a fault current contribution ratio only for fault sources identified as being in operation, by checking operating state variables for each fault source based on the power system information. 9. The method of claim 8,
The step of calculating the fault current inflow by the fault source includes:
A first circuit which constitutes an equivalent circuit for the line between the high-frequency power source and the fault source, which is set through the setting of the high-frequency power source, and which includes only the voltage source arranged in the negative direction of the high- And a second circuit including a voltage source other than the voltage source, and analyzing the first circuit and the second circuit. 9. The method of claim 8,
And outputting, by the output unit, the failure source and the contribution ratio for each failure source.
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