KR101497490B1 - Apparatus and method for stabilizing power system - Google Patents

Abstract

The present invention provides an apparatus and a method for stabilizing a power system, which can calculate the amount of load blocking or load switching using the flow and voltage of a line, a line-flow variation curve due to load shifting, and a bus-voltage variation curve due to the load shifting when multiple failures are generated in the power system. According to the present invention, the apparatus for stabilizing a power system performs the following procedures: calculating the amounts of load blocking and load switching based on collected system/flow data, a line-flow variation curve due to load shifting, and a bus-voltage variation curve due to the load shifting; comparing the collected system/flow data with a reference value; outputting a load-blocking signal based on the calculated amount of load blocking, if load blocking is determined; and outputting a load-switching signal based on the calculated amount of load switching, if load switching is determined.

Description

[0001] APPARATUS AND METHOD FOR STABILIZING POWER SYSTEM [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and method for stabilizing a power system, and more particularly, to an apparatus and method for stabilizing a power system that calculates a load cutoff amount and a load change amount when a power system fails.

In order to maintain the stability and reliability of the power system, the continuous allowable current of the domestic transmission line is applied for 20 minutes to 101 ~ 120%, and the overload rate operation standard for 121 ~ 150% is applied for 5 minutes.

In addition, according to the Korea Electric Power System Reliability and Electricity Quality Maintenance Standards, Korea Electric Power Corporation has installed and operated a malfunction prevention device to prevent system instability increase and voltage instability.

In the event of a failure, the failure prevention device uses the P-V curve and the F-V curve to calculate the load cutoff. However, the -V curve and the PV curve, which are used to examine the stability of the system, are a method of determining the stability by increasing the power of the transmission line. In the case of the load area far from the power generation stage, the impedance of the transmission line from the power generation stage to the sub- There is a problem that the amount of load cutoff is calculated.

As described above, since the failure preventive device can respond only to a system failure defined by a single failure or a double failure, it is difficult to cope with multiple failures.

In addition, there is a problem that the blocking load is not reflected in real time during the operation of the failure propagation preventing device, so that the blocking load may be blocked or shorted.

On the other hand, in case of a system change such as a ceasefire, a manual load switching plan is established in order to relieve overload in case of an incident.

However, the current system monitors the system status in real time and does not know the exact load change requirement according to the system condition in case of failure.

In manual load switching, there is a problem in that the operator manually calculates the load transfer amount, resulting in over-switching, insufficient switching, and human error during load transfer.

There are 6 places where the load is cut off in the case of a system fault by the ripple prevention device, and there is a problem that large scale power outage and system instability occur due to human error, malfunction of the relay.

Prior Art 1: Korean Patent Laid-Open No. 10-2013-0049239 (Title: Power system load control device and method) Prior Art 2: Korean Patent Laid-Open No. 10-2011-0035659 (titled "Load Cutoff Method and Apparatus)

The present invention has been proposed in order to overcome the above-mentioned problems of the prior art. The present invention proposes a method of detecting a load on a line when a multi-failure occurs in a system using a line curve of a line, And to calculate a cut-off amount or a transfer amount.

According to an aspect of the present invention, there is provided an apparatus for stabilizing a power system comprising: a collector for collecting system data of a power system and alga data of a transmission line; A calculation unit for calculating a load cutoff amount and a load transfer amount based on the collected systematic data and algae data, the algae change curve of the line due to the load movement, and the voltage change curve of the bus line due to the load movement; A judging unit for comparing the system data and the bird data collected by the collecting unit with a reference value to determine whether the load is blocked or not; And an output unit for outputting a load cutoff signal based on the calculated load cutout amount when the determination unit determines that the load cutoff is performed and outputting a load cutoff signal based on the calculated load cutoff amount when the determination unit determines that the load is switched .

The calculating unit calculates the pre-failure load corresponding to the pre-failure bus voltage and the post-failure load corresponding to the bus voltage after failure based on the voltage change curve of the bus due to the load movement when the overload occurs due to the bus voltage problem.

The calculating unit calculates the load before failure corresponding to the pre-failure bus voltage and the post-failure load corresponding to the bus voltage after failure based on the curve of the line change due to the load when the overload occurs due to the overload of the line.

The calculating section calculates the load transfer amount and the load cutoff amount by subtracting the post-failure load amount from the pre-failure load amount.

The judging unit judges whether a fault occurs in the system based on whether the circuit breaker of the monitoring transmission line is opened or closed. If the circuit breaker of the monitoring transmission line is open, it is judged that the system is faulty.

The judging unit judges that the load is cut when the overload amount of the transmission line is equal to or larger than the set value, and determines that the load is switched when the overload amount of the transmission line is less than the set value.

The output section transmits a load cutoff signal including the calculated load cutoff amount to the substation management apparatus when it is judged by the judging section that the load cutoff is detected. When the judging section judges the load cutoff, the output section outputs the load cutoff signal To the distribution line management apparatus.

According to an aspect of the present invention, there is provided a power system stabilization method comprising: collecting system data of a power system by a power system stabilization apparatus; Collecting algae data on a transmission line by a power system stabilizing device; Calculating a load cutoff amount and a load change amount based on the collected systematic data and algae data by the power system stabilization device and the voltage change curve of the bus line due to the algae change curve and the load change due to the load movement; Comparing the collected system data and algae data with a reference value by the power system stabilization device to determine whether the load is blocked or not; Outputting a load shutoff signal based on the calculated load shutoff amount when the power system stabilization device determines that the load shutoff is performed in the determining step; And outputting a load switching signal based on the calculated load transfer amount when the power system stabilization device determines that the load is switched in the determining step.

In the step of calculating the load interrupting amount and the load interconnection amount, the power system stabilizing device calculates, based on the voltage change curve of the bus due to the load movement when the overload occurs due to the voltage problem of the bus, ; Calculating a post-failure load amount corresponding to a post-failure bus voltage corresponding to a pre-failure bus voltage on the basis of a voltage change curve of the bus line due to load movement by the power system stabilization device; And a step of calculating a load transfer amount and a load blocking amount by subtracting the post-failure load amount from the pre-failure load amount by the power system stabilization device.

In the step of calculating the load cutoff amount and the load transfer amount, the power system stabilizer sets the pre-failure load corresponding to the pre-failure bus voltage on the basis of the curve of the tide change of the line due to the load movement when the overload occurs due to overload of the line Calculating; Calculating a post-failure load amount corresponding to a bus line voltage after a failure based on an algae change curve of the line due to a load movement when an overload occurs due to an overload of the line by the power system stabilization device; And a step of calculating a load transfer amount and a load blocking amount by subtracting the post-failure load amount from the pre-failure load amount by the power system stabilization device.

In the step of determining whether or not the load is cut off, the power system stabilizing device determines that the load is cut when the overload amount of the transmission line is equal to or greater than the set value, and determines that the load is switched when the overload amount of the transmission line is less than the set value.

In the step of determining whether the load is blocked or not, there is further included a step of determining that a fault has occurred in the system if the circuit breaker of the monitoring transmission line is in an open state by the power system stabilization device.

In the step of outputting the load cutoff signal, the power system stabilization apparatus transmits a load cutoff signal including the calculated load cutout amount to the substation management apparatus.

In the step of outputting the load switching signal, a load switching signal including the calculated load transfer amount is transmitted to the power distribution line management device by the power system stabilization device.

According to the present invention, an apparatus and method for stabilizing a power system is provided for stabilizing a power system by using a tidal variation curve of a line due to line tide, voltage, and load movement, and a voltage variation curve of a bus line due to load movement, It is possible to apply the present invention as a solution to the on-off manual operation of the failure propagation preventive device by judging by the operator that the pre-selected load is shut off at the time of system failure, which is a disadvantage of the existing fault propagation prevention device.

Also, the apparatus and method for stabilizing the power system can calculate the amount of cutoff or shift of the load when multiple faults occur in the system by using the line change curve of the line and the line change curve of the line due to the movement of the voltage and the load, Thus, it is possible to estimate the amount of load suitable for the system situation even in the event of multiple failures in real time in connection with Scada etc., thereby minimizing the amount of cutoff.

Also, the apparatus and method for stabilizing the power system can calculate the amount of cutoff or shift of the load when multiple faults occur in the system by using the line change curve of the line and the line change curve of the line due to the movement of the voltage and the load, The load transfer amount and the blocking amount are manually calculated in consideration of a system failure such as an armistice, but the load transfer amount can be automatically calculated and switched, thereby improving the system stability.

Also, the apparatus and method for stabilizing the power system can calculate the amount of cutoff or shift of the load when multiple faults occur in the system by using the line change curve of the line and the line change curve of the line due to the movement of the voltage and the load, , It is possible to select and shut off the appropriate breaking load in real time and to stabilize the system by transferring the load automatically to the other substation when load switching is necessary.

1 is a view for explaining a power system stabilization apparatus according to an embodiment of the present invention;
2 is a diagram for explaining a configuration of a power system stabilization apparatus according to an embodiment of the present invention.
FIGS. 3 to 5 are diagrams for explaining the calculation unit of FIG. 2;
6 is a flowchart illustrating a power system stabilization method according to an embodiment of the present invention.
Figs. 7 and 8 are diagrams for explaining steps of calculating the load cutoff amount and the load transfer amount in Fig. 6; Fig.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings in order to facilitate a person skilled in the art to easily carry out the technical idea of the present invention. . In the drawings, the same reference numerals are used to designate the same or similar components throughout the drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

Hereinafter, a power system stabilization apparatus according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a diagram for explaining a power system stabilizing apparatus according to an embodiment of the present invention, and FIG. 2 is a diagram for explaining a configuration of a power system stabilizing apparatus according to an embodiment of the present invention. Figs. 3 to 5 are diagrams for explaining the calculation unit of Fig. 2. Fig.

As shown in FIG. 1, the power system stabilization apparatus 100 collects power system data and alga data of the transmission line 10 from the scada server 200 and the field sensing apparatus 300. The power system stabilizing apparatus 100 uses the tidal variation curve (hereinafter referred to as LF curve) of the line due to the load movement and the voltage variation curve (hereinafter referred to as the LV curve) . The power system stabilizing apparatus 100 transmits the calculated load cutoff amount / load transfer amount to the substation managing apparatus 400 or the distribution line managing apparatus 500 provided in the substation 30. [ At this time, the power system stabilization apparatus 100 transmits a load cutoff amount to the substation management apparatus 400 when the load is cut off, and transmits a load change amount to the power line management apparatus 500 when the load is switched. Accordingly, the substation management apparatus 400 selects a block object based on the monitored amount of the distribution line 20, performs load cutoff, and stabilizes the power system. The distribution line management device 500 operates the switches of the distribution line 20 according to the distribution system operation system (not shown, that is, the distribution distribution system) to perform load switching to stabilize the power system. At this time, the power system stabilization apparatus 100 may display the load transfer amount, the switching object, the load blocking amount, and the blocking object on the screen so that the power supply can recognize the power supply. 2, the power system stabilization apparatus 100 includes a reference value setting unit 110, a collecting unit 120, a calculating unit 130, a determining unit 140, and an output unit 150 .

The reference value setting unit 110 sets a reference value that is a reference for generating a system fault. At this time, the reference value setting unit 110 sets a reference value including the permissible voltage range of the bus and the permissible capacity of the transmission line 10. Here, the reference value setting unit 110 receives the permissible voltage range of the bus and the permissible capacity of the transmission line 10 from the scada server 200, and sets the reference value.

The collecting unit 120 collects systematic data of the power system and alga data of the transmission line 10 from the field monitoring apparatus. At this time, the collecting unit 120 collects the measurement information including the voltage of the monitoring bus, the alga data P of the transmission line 10, and the breaker opening / closing information of the monitoring line.

The calculating unit 130 calculates the load blocking amount and the load transfer amount using the system data and the bird data collected by the collecting unit 120, the L-V curve, and the L-F curve. That is, when the determination unit 140 determines that an overload occurs due to a bus voltage problem, the calculation unit 130 calculates the load amount corresponding to the pre-failure bus voltage (i.e., the pre-failure load amount) based on the LV curve, (That is, the post-failure load amount). If the determination unit 140 determines that an overload has occurred due to an overload of the line, the calculation unit 130 calculates a load corresponding to the pre-failure bus voltage (i.e., the pre-failure load amount) (I.e., load after failure) is detected

The calculation unit 130 calculates the load transfer amount and the load cutoff amount by subtracting the post-failure load amount from the pre-failure load amount detected previously. That is, the calculating unit 130 calculates the load transfer amount and the load cutoff amount using the pre-failure load amount and the post-failure load amount detected based on the L-V curve in the case of the bus voltage problem. The calculation unit 130 calculates a load transfer amount and a load cutoff amount using the pre-failure load amount and the post-failure load amount detected based on the L-F curve in the case of a line overload problem.

Hereinafter, the L-V curve and the L-F curve used for calculating the load change amount and the load cutoff amount will be described in more detail with reference to FIGS. 3 to 5 attached hereto.

In the conventional technology for estimating the load cutoff using the PV curve and the FV curve, it is necessary to consider the generation amount of the generator in consideration of the voltage and the limit of the algae in the region of interest. There is a problem that the error is increased because the limit amount is reduced. Accordingly, in the present invention, the error due to the transmission line impedance is minimized through the transfer of loads in the adjacent region by using the L-V curve and the L-F curve.

As shown in FIG. 3, the amount of power flow on bus A in an angular system with n bus lines is expressed by Equation 1 below.

Where T is the power input to the bus, G is the generator entering the bus, and L is the load connected to the bus. Where δ is the angle of the voltage at the bus of interest and V is the magnitude of the busbar voltage.

In order to assume the scenario to represent the flow of the algae according to the load switching (blocking), apply the parameter μ indicating the change of the load to the load of the bus i to apply the algae change scenario according to the load change , The load in region A is reduced as shown in Equation (2) below.

In Region B, the load is expressed as increasing as shown in Equation (3) below.

Here, P _Lio is a real power value of the load at bus i, k _LAi is in the A region bus i P _{LAo, total} loop collection factor (fraction factor) and, k _LBi is the bus i in B area P _{LAo, total} collection and profile factor _{(fraction factor), P LA0,} total is the load reduced amount of power of the a area, ΔP _{LB, total} is the load increased power amount of the B area.

Equation (2) and Equation (3) are applied to the above-described Equation (1), the amount of power in Region A is expressed by Equation (4) below.

The power amount of the area B is expressed by the following equation (5).

Through the equations (4) and (5), the parameters of the voltage and algae are expressed as values for delta (phase), V (voltage), mu (load change) and DELTA P (algae change). That is, the algebraic equation is a basic expression representing a voltage change (L-V) according to a load change and a change (L-F) of an algae according to a load change.

The method of drawing the L-V curve and the L-F curve according to the designed formula can be expressed as shown in FIG. 4 based on the Jacobian of the Newton-Robson method. Substituting the value of V generated in the L-V curve into the equations (4) and (5), the value of P can be obtained and the L-F curve can be obtained by the amount of change of P value at this time.

The equation for obtaining the predictive parameter by applying the equation of the designed algebraic equation is as shown in Equation 6 below, and this equation can be summarized as Equation (7) through the Jacobian matrix.

In Equation (7), since only the voltage according to the load increase amount should be considered, the equation can be defined as Equation (8) below, and the change amount of the voltage of the predictor is calculated.

Here, the calculated change amount dV of the voltage is substituted into the variable value of the Corrector equation of the following equation (9), and the value of the voltage change amount in accordance with the load change amount is displayed (coordinate display of the curve, ).

This method draws the L-V curve repeatedly through calculations until the specified error rate is minimized. The voltage of the curve of L-V is plotted on the L-F curve through the P and Q values of each point according to Equation 4 and Equation 5, which are equations of voltage and current, which is a designed method.

As a result, there is no change in the effective power value of the whole load in the state where the power generation is fixed, and the calculation is stopped when it is repeatedly calculated by the designed formula and the repetitive algae calculation method by the Newton-Raphson method and exceeds the preset error. That is, if the condition of the following expression (10) is satisfied, the calculation is stopped.

As shown in FIG. 5, the principle based on the relationship between the load and the voltage, the load and the tidal current is initially designed, and is different from the voltage stability method by the existing P-V and F-V.

The determination unit 140 determines whether the power system stabilization apparatus 100 has failed. That is, the determination unit 140 determines whether or not the failure of the system occurs based on whether the monitoring transmission line 10 is opened or closed. At this time, if the breaker of the monitoring transmission line 10 is in an open state, the determination unit 140 determines that a fault has occurred in the system.

The determination unit 140 determines whether the cause of the failure is a voltage problem of the bus or an overload of the line. The determination unit 140 determines whether voltage instability occurs and whether an overload of the transmission line 10 occurs. If the determination unit 140 determines that the voltage is unstable and the overload of the transmission line 10 has occurred, the determination unit 140 determines whether the load is blocked. The determination unit 140 determines that the load is cut when the overload amount of the generated transmission line 10 is equal to or larger than the set value and determines that the load is switched when the overload amount of the transmission line 10 is less than the set value. Here, the set value is a value set by the operator, and is generally set to about 150%.

The output unit 150 outputs a load blocking amount to the substation management device 400 based on the determination result of the determination unit 140. [ That is, if the determination unit 140 determines that the load is cut off, the output unit 150 transmits the load cutoff amount calculated by the calculation unit 130 to the substation management device 400. Accordingly, the substation management apparatus 400 selects a block object based on the monitored amount of the distribution line 20, performs load cutoff, and stabilizes the power system. At this time, the output unit 150 may display the load cutoff amount and the cutoff object on the screen so that the power supply can be recognized.

The output unit 150 outputs the load transfer amount to the power line management device 500 based on the determination result of the determination unit 140. [ That is, the output unit 150 transmits the load transfer amount calculated by the calculation unit 130 to the distribution line management apparatus 500 when the determination unit 140 determines the load transfer. Accordingly, the power line management device 500 operates the switch of the power distribution line 20 according to the power distribution system control system (not shown, that is, the power distribution intelligence system) to perform load switching to stabilize the power system. At this time, the output unit 150 may display the load transfer amount and the transfer object on the screen so that the power supply can recognize the power supply.

Hereinafter, a power system stabilization method according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. FIG. 6 is a flowchart for explaining a power system stabilization method according to an embodiment of the present invention, and FIG. 7 is a diagram for explaining a step of calculating a load cutoff amount and a load transfer amount in FIG.

The power system stabilizing apparatus 100 collects system data of the power system (S100). The power system stabilization apparatus 100 collects systematic data including the voltage of the monitoring bus line and the breaker opening / closing information of the monitoring line from the field sensing apparatus 300.

The power system stabilization apparatus 100 collects alga data of the transmission line 10 (S200). The power system stabilization device 100 collects alga data of the transmission line 10 from the field sensing device 300.

The power system stabilization apparatus 100 calculates a load blocking amount and a load transfer amount based on the L-V curve or the L-F curve, and the system data and algae data collected (S300). This will be described in more detail with reference to FIG. 8 attached hereto.

The power system stabilization apparatus 100 sets a reference value (S410). At this time, the power system stabilization apparatus 100 sets a reference value including the allowable voltage range (reference voltage) of the bus and the allowable capacity (line capacity) of the transmission line 10. [ Here, the power system stabilization apparatus 100 receives the permissible voltage range of the bus and the permissible capacity of the transmission line 10 from the scada server 200, and sets the reference value.

The power system stabilization apparatus 100 determines whether or not a fault has occurred in the system. That is, the power system stabilization apparatus 100 determines whether or not a fault has occurred in the system based on whether the monitoring transmission line 10 is open or closed. If the circuit breaker of the supervisory transmission line 10 is detected to be in an open state to determine that a fault has occurred in the system (S420; YES), the power system stabilizer 100 determines whether the cause of the fault is a bus voltage problem It is judged whether it is an overload. If it is determined that there is a bus voltage problem (S430; Yes), the power system stabilization apparatus 100 detects a load amount corresponding to the pre-failure bus voltage based on the L-V curve (S440). For example, the power system stabilization apparatus 100 detects the load amount corresponding to the reference value of the bus voltage (i.e., A in Fig. 9, the allowable capacity, and the allowable voltage range) as the pre-failure load amount.

The power system stabilization apparatus 100 detects a load amount corresponding to the bus voltage after the failure based on the L-V curve (S440). For example, the power system stabilization apparatus 100 detects a load amount corresponding to a bus line voltage (i.e., B in Fig. 9) after a failure as a pre-failure load amount.

On the other hand, if it is determined that the line is overloaded, the power system stabilization apparatus 100 detects a load corresponding to the pre-failure bus voltage based on the LF curve (S460), and calculates a load amount corresponding to the bus voltage (S470).

The power system stabilizing apparatus 100 calculates a load transfer amount and a load cutoff amount by subtracting the post-failure load amount from the pre-failure load amount (S480). That is, the power system stabilization apparatus 100 calculates the load transfer amount and the load cutoff amount (i.e., C in Fig. 9) using the pre-failure load amount and the post-failure load amount detected based on the L-V curve in the case of the bus line voltage problem. The power system stabilizing apparatus 100 calculates the load change amount and the load cutoff amount (i.e., C in Fig. 9) using the pre-failure load amount and the post-failure load amount detected based on the L-F curve in the case of an overload problem of the line.

When the voltage instability occurs (S400; YES), when the overload of the transmission line 10 occurs (S500; YES), the power system stabilization device 100 determines whether or not the load is shut off. At this time, the power system stabilizer 100 determines that the load is cut when the overload amount of the transmission line 10 is equal to or greater than the set value, and determines that the load is switched when the overload amount of the transmission line 10 is less than the set value. Here, the set value is a value set by the operator, and is generally set to about 150%. If it is judged that the load is interrupted (S600; YES), the power system stabilizing apparatus 100 cuts off the load with the calculated load cutoff amount (S700). That is, the power system stabilization apparatus 100 transmits the load cutoff amount to the substation management apparatus 400 when the load is cut off. Accordingly, the substation management apparatus 400 selects a block object based on the monitored amount of the distribution line 20, performs load cutoff, and stabilizes the power system. At this time, the power system stabilizing apparatus 100 may display the load cutoff amount and the cutoff object on the screen so that the power supply can be recognized.

When the power system stabilizing apparatus 100 determines that the load is switched, the load is switched to the calculated load change amount (S800). That is, the power system stabilization apparatus 100 transmits a load transfer amount to the distribution line management apparatus 500 at the time of load switching. The distribution line management device 500 operates the switches of the distribution line 20 according to the distribution system operation system (not shown, that is, the distribution distribution system) to perform load switching to stabilize the power system. At this time, the power system stabilizing apparatus 100 may display the load transfer amount and the switching object on the screen so that the power source can be recognized.

As described above, an apparatus and method for stabilizing a power system is a system for stabilizing a power system and a method for stabilizing a power system using a curve of a bird's current change due to a line current and a voltage and a load, It is possible to apply the present invention as a solution to the on-off manual operation of the failure propagation preventive device by judging by the operator that the pre-selected load is shut off at the time of system failure, which is a disadvantage of the existing fault propagation prevention device.

Also, the apparatus and method for stabilizing the power system can calculate the amount of cutoff or shift of the load when multiple faults occur in the system by using the line change curve of the line and the line change curve of the line due to the movement of the voltage and the load, Thus, it is possible to estimate the amount of load suitable for the system situation even in the event of multiple failures in real time in connection with Scada etc., thereby minimizing the amount of cutoff.

Also, the apparatus and method for stabilizing the power system can calculate the amount of cutoff or shift of the load when multiple faults occur in the system by using the line change curve of the line and the line change curve of the line due to the movement of the voltage and the load, The load transfer amount and the blocking amount are manually calculated in consideration of a system failure such as an armistice, but the load transfer amount can be automatically calculated and switched, thereby improving the system stability.

Also, the apparatus and method for stabilizing the power system can calculate the amount of cutoff or shift of the load when multiple faults occur in the system by using the line change curve of the line and the line change curve of the line due to the movement of the voltage and the load, Thus, it is possible to select and shut off an appropriate breaking load in real time, and to stabilize the system by transferring the load to the other substation 30 automatically when load switching is necessary.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but many variations and modifications may be made without departing from the scope of the present invention. It will be understood that the invention may be practiced.

10: transmission line 20: distribution line
30: Substation 100: Power system stabilizer
110: reference value setting unit 120:
130: Calculator 140:
150: output unit 200: Scada server
300: Field sensing device 400: Substation management device
500: Distribution line management device

Claims (14)

A collector for collecting system data of the power system and alga data of the transmission line;
A calculation unit for calculating a load cutoff amount and a load transfer amount based on the collected systematic data and algae data, the algae change curve of the line due to the load movement, and the voltage change curve of the bus line due to the load movement;
A judging unit for comparing the system data and the bird data collected by the collecting unit with a reference value to determine whether the load is blocked or not; And
And outputs a load cut-off signal based on the calculated load cut-off amount when it is judged that the load cut-off is judged by the judging unit. When judging that the load cut-out is judged by the judging unit, ≪ / RTI >
The calculating unit calculates,
Wherein the pre-failure load corresponding to the pre-failure bus voltage and the post-failure load corresponding to the bus voltage after failure are calculated based on the voltage change curve of the bus due to the load movement when the overload occurs due to the voltage problem of the bus, Stabilizing device. delete The method according to claim 1,
The calculating unit calculates,
Wherein the pre-failure load corresponding to the pre-failure bus voltage and the post-failure load corresponding to the bus voltage after failure are calculated on the basis of the curve of the line change of the line due to the load movement when the overload occurs due to overload of the line, Device. The method according to claim 1 or 3,
The calculating unit calculates,
And calculates a load transfer amount and a load cutoff amount by subtracting the post-failure load amount from the pre-failure load amount. The method according to claim 1,
Wherein,
Wherein it is determined whether a failure of the system occurs based on whether or not the circuit breaker of the monitoring transmission line is opened or closed, and if the circuit breaker of the monitoring transmission line is in an open state, it is determined that a fault has occurred in the system. The method according to claim 1,
Wherein,
When the overload amount of the power transmission line is equal to or greater than the set value, it is determined that the load is cut off, and when the overload amount of the power transmission line is less than the set value, the power system stabilization device is determined. The method according to claim 1,
The output unit includes:
Wherein the control unit transmits a load cutoff signal including the calculated load cutoff amount to the substation management apparatus when it is judged by the judging unit that the load cutoff is performed, And transmits a signal to the power line management apparatus. Collecting system data of the power system by the power system stabilization device;
Collecting alga data on a transmission line by the power system stabilization device;
Calculating the load interception amount and the load interchange amount based on the collected systematic data and algae data by the power system stabilization device and the voltage change curve of the bus due to the load change and the algebraic change curve of the line due to the load movement; ;
Comparing the collected systematic data and algae data with a reference value by the power system stabilization device to judge whether the load is blocked or not;
Outputting a load shutoff signal based on the calculated load shutoff amount when the power system stabilization device determines that the load shutoff is performed in the determining step; And
Outputting a load switching signal based on the calculated load transfer amount when the power system stabilization device determines that the load switching is to be performed in the determining step,
In the step of calculating the load blocking amount and the load transfer amount,
Calculating a pre-failure load amount corresponding to a pre-failure bus voltage based on a voltage change curve of a bus line due to a load movement when an overload occurs due to a voltage problem of the bus line by the power system stabilization device;
Calculating a post-failure load amount corresponding to a post-failure bus voltage corresponding to a pre-failure bus voltage on the basis of a voltage change curve of the bus line due to load movement by the power system stabilization device; And
And a step of calculating a load transfer amount and a load shutoff amount by subtracting the post-failure load amount from the pre-failure load amount by the power system stabilization device. delete The method of claim 8,
In the step of calculating the load blocking amount and the load transfer amount,
Calculating a pre-failure load amount corresponding to a pre-failure bus voltage on the basis of a tidal variation curve of the line due to a load movement when an overload occurs due to an overload of the line by the power system stabilization device;
Calculating a post-failure load corresponding to a bus voltage after a fault based on a curve of a line change of a line due to load movement when an overload occurs due to an overload of the line by the power system stabilization device; And
And a step of calculating a load transfer amount and a load shutoff amount by subtracting the post-failure load amount from the pre-failure load amount by the power system stabilization device. The method of claim 8,
In the step of determining whether the load is blocked or not,
Wherein the power system stabilizing device determines that the load is cut when the overload amount of the transmission line is equal to or larger than the set value and determines that the load is switched when the overload amount of the transmission line is less than the set value. The method of claim 8,
In the step of determining whether the load is blocked or not,
Further comprising the step of determining that a fault has occurred in the system if the circuit breaker of the monitoring transmission line is in an open state by the power system stabilization device. The method of claim 8,
In the step of outputting the load cutoff signal,
Wherein the power system stabilization device transmits a load cutoff signal including the calculated load cutoff amount to the substation management device. The method of claim 8,
In the step of outputting the load switching signal,
Wherein the power system stabilization device transmits a load change signal including the calculated load change amount to the power line management device.

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