KR20140030740A - Apparatus and method for preventing loads using the switch in power system - Google Patents

Abstract

In the event of an abnormality of the power system, a load interruption device and a method using a switchgear in a power system to cut the load according to the load interruption order of each section set according to the generation amount and load amount of the distributed power supply arranged in each section are presented. In the proposed power system, the load cut-off device using the switch calculates and calculates the total load of each of the sections constituting the lines based on the load amount of each of the loads disposed on the lines of the power system and the generation amount of each of the distributed power supplies. A setting unit for setting a load shedding order of each of the sections based on at least one of a total load amount and a priority of loads; And a control unit which cuts off the load for each section by controlling the switchgear or the breaker on the basis of the load breaking sequence set by the setting unit.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a load interrupting apparatus using a switch in a power system,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an apparatus and method for disconnecting a load using a switch in a power system, and more particularly, And more particularly, to a load blocking device and method using the same.

Power system refers to a system consisting of power generation, consumption, and consumption by connecting power plants, substations, and loads to a customer (ie, power consumer) through a transmission line. Since the power system must balance the supply and demand with the homogeneity of the generation and consumption of electric power, the monitoring of the electric power demand must be continuously carried out.

In the power system, abnormalities such as frequency, voltage, etc. occur due to the cause of the generator failure and the transmission line failure. In this case, in the power system, an appropriate amount of load is cut off to stabilize the power system.

The method used to cut off the current load is to use a low frequency relay or a low voltage relay to shut down the load on the entire line by opening the breaker of the substation when the frequency and voltage are satisfied. At this time, the line is blocked in accordance with the pre-specified order for each line to block all loads connected to the corresponding line.

However, if the load is cut off by the line in the power system, the critical load included in the line may not be supplied.

Alternatively, there is a method in which priority is assigned to each line and the load is stepwise blocked according to the priority. For example, Korean Patent No. 10-1054944 (entitled "Load Disconnection Method and Apparatus") discloses a technique in which when the voltage of a target bus line falls below a voltage lower limit, .

In recent years, in the case of a recent power system in which the installation of a distributed power source using renewable energy or the like is increasing, fluctuation occurs in the power generation amount of the distributed power source depending on various conditions. However, even when the generation amount of the distributed power source is sufficient, when the load is interrupted according to the conventional technique for stabilizing the power system (that is, And thus unnecessary load interruption occurs.

Therefore, when using the conventional load cutoff method, not only the economic loss and the social inconvenience are caused according to the customer whose power is cut off, but also the public safety is threatened.

The present invention has been proposed to solve the above-mentioned problems, and each of the lines of the power system is divided into a plurality of sections, each set in accordance with the generation amount and load of the distributed power supply disposed in each section when the power system abnormality occurs An object of the present invention is to provide a load breaking device and method using a switch in a power system to cut a load according to a load breaking sequence of a section.

In order to achieve the above object, a load interruption device using a switch in a power system according to an embodiment of the present invention includes lines based on the amount of load of each of the loads disposed on the lines of the power system and the amount of power generated by each of the distributed power supplies. A setting unit configured to calculate a total load amount for each section of each of the constituting sections and set a load shedding order for each of the sections based on at least one of the calculated total load amount for each section and priority of the loads; And a control unit which cuts off the load for each section by controlling the switchgear or the breaker on the basis of the load breaking sequence set by the setting unit.

The setting unit recalculates the total load amount of each of the sections constituting the lines when a change occurs in the power system, and resets the load shedding order of each of the sections based on at least one of the reloaded total load amount and the priority of the loads.

The setting unit may include a calculation module configured to calculate a total load amount for each section based on the load amount of each of the loads disposed on the lines of the power system and the generation amount of each of the distributed power supplies; And a setting module for setting a load shedding order of each of the sections based on at least one of the total load amount for each section and the priority of the loads calculated by the calculation module.

The calculation module calculates the total load for each section by summing loads of loads arranged in the sections and subtracting the amount of generation of distributed power supplies arranged in the sections.

The setting module sets the load shedding order of each of the sections based on the priority of the loads, and sets the load shedding order in the order of lower priority of the load disposed in each section.

The setting module sets the load shedding order of each of the sections based on the total load amount for each section calculated by the calculation module, and sets the load shedding order in the order of high total load.

The setting module sets the load shedding order of each section based on the total load amount of each section calculated by the calculation module and the priorities of the loads, and sets the load shedding order in the order of lower priority of the loads arranged in each section. If there is a section in which loads with the same priority are arranged, the load blocking order is set based on the total load of the section.

The setting module sets the load shedding order in the order in which the total load amount per section is high in the section in which loads of the same priority are arranged.

The setting unit receives a priority of loads arranged in the power system.

The control unit blocks the load for each section in the load breaking order until the total load amount sum of the blocked sections becomes equal to or greater than the required load breaking amount.

The apparatus may further include a detector configured to detect a load amount of each of the loads disposed in the lines of the power system and a generation amount of each of the distributed power supplies.

The detection unit detects a load amount and a generation amount when a change situation including at least one of a change in a power system configuration, a new customer and a new main customer, and a change in generation amount of a distributed power source occurs.

The detection unit may include a load detection module configured to detect a load amount of each of the loads when the power system is initially driven and when a change situation occurs; And a generation amount detection module configured to detect a generation amount of each of the distributed power supplies when the power system is initially driven and when a change situation occurs.

Load breaking method using the switch in the power system according to an embodiment of the present invention to achieve the above object, by the setting unit, the priority of the loads arranged in the line of the power system and each of the sections constituting the line Setting a load shedding order of each of the sections based on at least one of the total loads of the sections; By the controller, controlling the switch or the breaker according to the set load breaking order to cut off the load for each section; And blocking, by the control unit, the load of the section corresponding to the next load interruption order if the total load of the sections blocked in the blocking step is less than the required interruption amount.

The setting of the load shedding order may include setting, by the setting unit, the total load amount of each section of the sections constituting the lines based on the load amount of each of the loads disposed on the lines of the power system and the generation amount of each of the distributed power supplies. Calculating.

The setting of the load shedding order may include calculating, by the setting unit, a total load amount for each section based on the load amount of each of the loads disposed on the lines of the power system and the generation amount of each of the distributed power supplies; And setting, by the setting unit, a load shedding order of each of the sections based on at least one of the calculated total load amount for each section and priority of the loads.

In the step of calculating the total load amount for each section, the setting unit calculates the total load amount for each section by subtracting the loads of the loads arranged in the section and subtracting the generation amount of the distributed power supplies arranged in the section.

The setting of the load shedding order may include: recalculating, by the setting unit, a total load amount for each section of the sections constituting the lines when a change occurs in the power system; And resetting, by the setting unit, the load shedding order of each of the sections based on at least one of the total load amount of each reloaded section and the priority of the loads.

In the step of setting the load shedding order, the setting unit sets the load shedding order of each of the sections based on the priority of the loads, but sets the load shedding order in the order of lower priority of the loads arranged in each section. do.

In the step of setting the load shedding order, the setting unit sets the load shedding order of each of the sections based on the total load amount of each section, and sets the load shedding order in the order of the highest total load amount of the sections.

In the step of setting the load shedding order, the setting unit sets the load shedding order of each of the sections based on the total load amount of each section and the priority of the loads, but in order of lower priority of the loads arranged in the sections. Set the load shedding order, and if there is a section in which loads with the same priority are arranged, set the load shedding order based on the total load of each section of the corresponding section.

In the step of setting the load shedding order, the setting unit sets the load shedding order in the order in which the total load amount per section is high in the section in which loads of the same priority are arranged.

The setting unit may further include receiving a priority of loads arranged in the power system.

Detecting, by the detection unit, the amount of load of each of the loads arranged in the lines of the power system and the amount of power generated by each of the distributed power sources.

In the detecting step, the detection unit detects a load amount and a generation amount when a change situation including at least one of a change in the power system configuration, new customer creation and destruction, and a change in generation amount of the distributed power source occurs.

According to the present invention, a load interrupting apparatus and method using a switch in a power system disconnects a load by opening a switch for each section, unlike the prior art in which a load is shut off when the load is interrupted, It is possible to sequentially and partly shut off the load from the interval in which the blocking order is determined in consideration of the importance of the load and the load amount, thereby minimizing the power cut-off of the critical load.

In addition, the load shedding device and method using the switch in the power system to minimize the load interruption in the power system by setting the load shedding order of each section in consideration of the sum of the generation amount and load for each section in consideration of the generation amount of the distributed power source. It can be effective.

Brief Description of the Drawings Fig. 1 is a diagram for explaining a line configuration of a power system. Fig.
BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a load interrupting apparatus using a switch in a power system.
3 is a view for explaining a detection unit of FIG.
4 is a diagram for explaining a setting unit of FIG. 2.
5 is a view for explaining a calculation module of FIG.
6 to 12 are views for explaining the setting module of FIG.
13 is a flowchart illustrating a load shedding method using a switch in a power system according to an embodiment of the present invention.
14 is a flowchart for explaining a step of setting a load shedding order for each section of FIG. 13.
15 is a flowchart illustrating a modification of the load shedding method using the switch in the power system according to an embodiment of the present invention.

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.

First, before describing an embodiment of the present invention, a line configuration of a power system will be described with reference to the accompanying drawings. 1 is a diagram for explaining a line configuration of a power system.

The power system is composed of a plurality of lines (10). 1, each line 10 is divided into a plurality of sections A separated from the closest switch 30 and the switch 30 or between the switch 30 and the breaker 20, . The circuit breaker 20 from the line 10 to the next switch 30 is divided into a view section B and the other end section (C). At least one of the load 40 and the distributed power source 50 is disposed in each section of the line 10.

The present invention cuts off the load 40 in units of sections through opening and closing of the switch 30 unlike the prior art in which the load 40 is cut off in units of the line 10 through the opening and closing of the breaker 20. At this time, in the present invention, the interruption order of each section is set based on the importance (that is, the priority) of the important load 40 and the load amount, the generation amount of the distributed power source 50, and the switch 30 according to the interruption order. The load is interrupted sequentially from the end section C of the track 10 to the view point section B.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a load cutoff device using a switch in a power system according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. 2 is a view for explaining a load interrupting device using a switch in a power system according to an embodiment of the present invention. FIG. 3 is a diagram for describing the detector of FIG. 2, and FIG. 4 is a diagram for explaining the setting unit of FIG. 2. FIG. 5 is a diagram for describing the calculation module of FIG. 4, and FIGS. 6 to 12 are diagrams for explaining the setting module of FIG. 4.

As shown in FIG. 2, the load shedding device 100 using the switch in the power system includes a detector 120, a setting unit 140, and a controller 160.

The detection unit 120 detects the load of the loads 40 connected to the power system and the amount of power generation of the distributed power sources 50. [ That is, the detection unit 120 detects the load of each of the loads 40 connected to the respective lines 10 constituting the power system, and the amount of power generation of each of the distributed power sources 50. At this time, the detection unit 120 detects the load and the power generation amount when a variation situation such as a change in the system configuration, establishment and disappearance of the main customer, and fluctuation of the power generation amount of the distributed power source 50 occurs during the operation of the power system. To this end, as shown in FIG. 3, the detection unit 120 detects the load of the loads 40 connected to the respective lines 10 of the power system when the power system is initially driven and when a change situation occurs. ), And a generation amount detection module 124 for detecting a generation amount of the distributed power sources 50 connected to each line 10 of the power system when the power system is initially driven and when a change situation occurs.

The setting unit 140 calculates a total load amount per section based on the load amount and the power generation amount from the detection unit 120. [ That is, the setting unit 140 calculates the total load per section based on at least one of the load amount and the power generation amount for each section of the power system. The setting unit 140 sets the load shedding order based on at least one of the calculated total load amount for each section and priority of each load 40. At this time, the setting unit 140 recalculates the total load amount by section in the event of a change in the system configuration, the establishment and destruction of the main customer, the change in the generation amount of the distributed power source 50, and the like. The load shedding order of each section is reset based on the total load amount per section and the priority of each load 40.

To this end, as shown in FIG. 4, the setting unit 140 may be configured based on at least one of a calculation module 142 for calculating the total load amount for each section, and the total load amount for each section and the priority of each load 40. It is configured to include a setting module 144 for setting the load shedding order of each section.

The calculation module 142 calculates the total load amount for each section of the power system based on the load amount of the load 40 and the generation amount of the distributed power source 50 detected by the detector 120. At this time, the calculation module 142 calculates the total load amount for each section by summing the load amounts of the loads 40 arranged in the section and subtracting the generation amount of the distributed power source 50 arranged in the section. For example, when the load amount is 1MW in the section, the generation amount of the distributed power source 50 is 2MW, the calculation module 142 calculates the total load amount of the section is -1MW.

As another example, as shown in FIG. 5, a case where the power system is configured will be described as an example.

The line 10 is provided with a circuit breaker 20 and a first switch 30a to a fourth switch 30d. At this time, a first load 40a having a load of 100 kW is disposed in the first section (that is, between the breaker 20 and the first switch 30a). A second load 40b having a load of 100 kW is disposed in the second section (that is, between the first switch 30a and the second switch 30b). In the third section (ie, between the second switch 30b and the third switch 30c), a third load 40c having a load of 50 kW is disposed. In the fourth section (that is, between the third switch 30c and the fourth switch 30d), a distributed power supply 50 having a power generation amount of 300 kW and a fourth load 40d having a load amount of 100 kW are disposed.

In this case, the total load of the first section and the second section is 100 kW, and the total load of the third section is 50 kW. At this time, the total load amount of the fourth section is calculated by subtracting the power generation amount of the distributed power supply 50 from the load amount of the fourth load 40d. Accordingly, the total load amount of the fourth section is -200 kW. When the third switchgear 30c is opened by the controller 160 to be described later (that is, D), the power generation force is reduced by 200 kW, and when the second switchgear 30b is opened (that is, by E), the power generation force is reduced by 150 kW. When one opener 30a is opened (that is, F), the generating power is reduced by 50 kW, and when the breaker 20 is blocked (that is, G), the load is reduced by 50 kW. As such, when the generation amount of the distributed power source 50 is not taken into consideration as in the related art, when the third switch 30c is opened, the distributed power source 50 and the fourth load 40d are separated from the system, so that the total load of the system. Increases (ie, decreases in generating power).

The setting module 144 sets the load shedding order based on the priority of each load 40 disposed in the power system. At this time, the setting module 144 sets the load shedding order in the order of low priority of the load 40 disposed in each section.

For example, as shown in FIG. 6, in a power system composed of the first line 10a to the fourth line 10d so that only loads 40 are disposed, the third rank is the third in the third section of the first line 10a. Critical loads 40a are arranged, second-order critical loads 40b are disposed in the fourth section of the second line 10b, and second-order critical loads are placed in the second section of the third line 10c. It is assumed that 40b) is arranged, and the priority load 40c of the first priority is arranged in the fourth section of the fourth line 10d. At this time, it is assumed that all the important loads 40 have the same capacity.

Accordingly, the setting module 144 sets the sections in which the load 40 is not arranged in the first load interruption order (that is, ① in FIG. 7), and sets the sections in which the 3rd priority loads 40a are arranged. 2 load interruption order (ie, ② in FIG. 7). The setting module 144 sets the sections in which the second priority loads 40b are arranged in the second load blocking order. In this case, since the second priority loads 40b are disposed in the second section of the third line 10, the fourth load of the second line 10 in which the second priority loads 40b is disposed is one. Set the load shedding order earlier than the section. Therefore, the setting module 144 sets the first load to the fourth section of the second line 10b in the third load blocking order (that is, ③ in FIG. 7), and sets the first line of the third line 10c. The interval from the section to the second section is set in the fourth load blocking order (ie, ④ in FIG. 7). Finally, the setting module 144 sets the first to fourth sections of the fourth line 10d on which the first priority load 40c is arranged in the fifth load blocking order (ie, ⑤ in FIG. 7). do.

The setting module 144 sets the load shedding order based on the total load amount for each section calculated by the calculating module 142. At this time, the setting module 144 sets the load shedding order in the order in which the total load amount is high (or the order in which the amount of power generation is small).

For example, as shown in FIG. 8, the first line 10a to the fourth line 10d may be configured to include three portions of the first line 10a in the power system to which the load 40 and the distributed power source 50 are connected. The 100 kW distributed power supply 50 and the 50 kW load 40 are disposed in the first section, the 50 kW load 40 is disposed in the fourth section of the second line 10b, and the second of the third line 10c. It is assumed that the 100 kW load 40 is disposed in the first section, and the 200 kW distributed power supply 50 and the 100 kW load 40 are disposed in the fourth section of the fourth line 10d.

The setting module 144 receives the total load of each section from the calculation module 142 (see FIG. 8). At this time, the calculation module 142 calculates the total load of -50kW for the third section in the first section of the first line 10a, and 50kW for the fourth section in the first section of the second line 10b. Calculate the total load of. The calculation module 142 calculates a total load of 100 kW for the second section of the first section of the third line 10c, and -100 kW for the fourth section of the fourth section 10d for the fourth section. Calculate the load. In this case, when the total load is negative (-) open the section (that is, the grid separation), the overall system means that the load 40 is not reduced, but the power generation is reduced.

Accordingly, the setting module 144 sets the sections in which the load 40 is not arranged in the first load blocking order (that is, ① in FIG. 9), and the sections in which the total load is 50 kW in the second load blocking order (that is, ② in FIG. 9. The setting module 144 sets the sections in which the total load is 50 kW in the third load blocking order (that is, ③ in FIG. 9), and the sections in which the total load is -50 kW in the fourth load blocking order (ie, ④ in FIG. 9). ), And the sections with the total load of -100 kW are set in the fifth load blocking order (that is, ⑤ in FIG. 9).

The setting module 144 sets the load shedding order based on the priority of each load 40 disposed in the power system and the total load amount for each section calculated by the calculating module 142. At this time, the setting module 144 sets the load shedding order according to the total load amount of the section in which the loads 40 having the same priority are arranged. That is, the setting module 144 sets the load shedding order in the order of the high total load in the section in which the loads 40 of the same priority are arranged.

For example, as shown in FIG. 10, the first line 10a to the fourth line 10d may be configured to include three portions of the first line 10a in the power system to which the load 40 and the distributed power source 50 are connected. The 100 kW distributed power supply 50 and the 50 kW critical load 40a are disposed in the first section, the 50 kW critical load 40a is disposed in the fourth section of the second line 10b, and the third line 10c. It is assumed that 50 kW of critical load 40b is disposed in the second section of, and 100 kW of distributed power supply 50 and 50 kW of critical load 40b are disposed in the fourth section of the fourth line 10d. At this time, the critical load 40a disposed on the first line 10a and the second line 10b is the load 40 of the first order, and the important load 40a disposed on the third line 10c and the fourth line 10d. It is assumed that the load 40b is the second rank load 40.

First, the setting module 144 sets the sections in which the load 40 is not arranged in the first load blocking order (that is, ① in FIG. 11), and selects the sections in which the load 40 having the second priority is arranged. The second load blocking order (ie, ② of FIG. 11) is set, and the sections in which the load 40 having the priority is arranged are set in the third load blocking order (ie, ③ of FIG. 11).

At this time, the setting module 144 receives the total load amount of each of the sections in which the loads 40 having the same priority are arranged from the calculation module 142 (see FIG. 11). At this time, the calculation module 142 calculates the total load of -50kW for the third section in the first section of the first line 10a, and 50kW for the fourth section in the first section of the second line 10b. Calculate the total load of. The calculation module 142 calculates a total load of 50 kW for the second section in the first section of the third line 10c, and -50 kW for the fourth section in the fourth section 10d for the fourth section. Calculate the load. In this case, when the total load is negative (-) open the section (that is, the grid separation), the overall system means that the load 40 is not reduced, but the power generation is reduced.

Accordingly, the setting module 144 blocks the first and second sections of the third line 10c of the third line 10c having the largest total load among the sections in which the second priority loads 40b are arranged (ie, FIG. 12), and the first to fourth sections of the fourth line 10d having a small total load are set in the second load interruption order (that is, ③ in FIG. 12). The setting module 144 blocks the first to fourth sections of the second line 10b in which the total load is large among the sections in which the priority load 40a of the first order is arranged in the fourth load blocking order (that is, in FIG. 12). ④), and the first to fourth sections of the first line 10a having a small total load are set in the second load interruption order (that is, ⑤ in FIG. 12).

The setting module 144 may receive a priority of the loads 40 arranged in the power system from the manager. That is, the setting module 144 receives a priority for each load 40 disposed in the power system from the manager terminal.

The controller 160 cuts off the load 40 for each section by controlling the switch 30 based on the load shedding order of each section set by the setting unit 140. At this time, the controller 160 sequentially blocks the load 40 in the load breaking order until the total load blocked through the control of the switch 30 is equal to or greater than the required load breaking amount.

For example, the total load of the sections corresponding to the first load blocking sequence is 50 kW, the total load of the sections corresponding to the second load blocking sequence is 80 kW, and the total load of the sections corresponding to the third load blocking sequence is 50 kW. It is assumed that the total load of the sections corresponding to the fourth load blocking order is 100 kW.

In this case, when the required load breaking amount is 100kW, since the total load amount of the sections corresponding to the first load breaking order and the second load breaking order is 130kW, the controller 160 controls the switch 30 to control the first load breaking order and The sections corresponding to the second load blocking sequence are blocked.

If the required load breaking amount is 150kW, since the total load amount of the sections corresponding to the first load breaking order to the third load breaking order is 180kW, the controller 160 controls the switch 30 to control the first load breaking order to the third load. Block sections corresponding to the load shedding order.

At this time, the control unit 160 monitors the system status in the case of the switch 30 capable of measuring the frequency or voltage, etc. When the frequency, voltage, etc. reaches the set value, the control unit 160 opens the switch 30 after the switch 30, that is, the terminal end. Power supply to the load 40 in the direction is cut off. The control unit 160 monitors the system status in the system operating system in the case of the switch 30 which is impossible to measure frequency or voltage, and when the set value is reached, the controller 160 issues a control command to the switch 30 in the operating system to operate the switch 30. The power supply may be cut off after the switch 30, that is, the load 40 in the terminal direction.

Hereinafter, a load shedding method using a switch in a power system according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. 13 is a flowchart illustrating a load shedding method using a switch in a power system according to an embodiment of the present invention. FIG. 14 is a flowchart for describing a step of setting a load shedding order for each section of FIG. 13.

The setting unit 140 sets the load blocking order for each section based on at least one of the priority of the loads 40 disposed on the line 10 of the power system and the total load amount for each section of the line 10 (S100). . In this case, the steps of setting the load shedding order for each section of the power system will be described in more detail with reference to the accompanying drawings.

The setting unit 140 calculates the total load per section of each line 10 (S110). At this time, the setting unit 140 calculates the total load of the corresponding section by subtracting the amount of power generation of the distributed power source 50 disposed on the line 10 from the load amount disposed on the line 10 as shown in Equation 1 below. . Here, if the total load is negative, it means that the generation power of the section decreases.

If there is a priority of the loads 40 disposed in each section (S120; YES), the setting unit 140 sets a load shedding order according to the priority of the loads 40 (S130). In this case, the setting unit 140 sets the load shedding order of the sections in the order in which the low priority loads 40 are arranged. That is, the setting unit 140 sets the load shedding order in the reverse order with respect to the priority of the load 40. For example, when the first load 40 and the second load 40 are disposed in each section, the section in which the second load 40 is disposed is set in the first load blocking order, and the first load 40 ) Is set in the second load blocking order.

At this time, if the load 40 having the same priority exists (S140; Yes), the setting unit 140 changes the load blocking order based on the total load amount of the sections in which the load 40 having the same priority is arranged. (S150). That is, the setting unit 140 calculates the total load of each of the sections in which the loads 40 having the same priority are arranged. The setting unit 140 sets the load shedding order in the order in which the total load of the calculated sections is large. For example, assuming that loads 40 having the same priority and load amount are arranged in one section and two sections, respectively, and distributed power supply 50 is disposed in one section, the total load of one section is divided into two sections. It becomes smaller than the total load. Therefore, the setting unit 140 sets two sections in the first load interruption order and sets one section in the second load interruption order.

If the priority of the loads 40 disposed in each section does not exist (S120; no), the setting unit 140 sets the load shedding order based on the calculated total load amount for each section (S160). That is, when loads 40 having no priority are set in the power system, the setting unit 140 calculates the total load of each section in which the load 40 is installed. In this case, when the distributed power source 50 is disposed in the section, the setting unit 140 calculates the total load of the corresponding section by using Equation 1 described above. The setting unit 140 sets the load shedding order based on the calculated total load for each section. At this time, the setting unit 140 sets the load shedding order in the order of the large amount of the total load calculated for each section. For example, if the total load of one section is 50kW, the total load of two sections is -50kW, and the total load of three sections is -100kW, the setting unit 140 sets the section 1 in the first load blocking order. , Section 2 is set in the order of the second load blocking, and section 3 is set in the order of the third load blocking.

The controller 160 cuts off the load by section 40 based on a preset load blocking order by section (S200). That is, the controller 160 cuts off the load 40 for each section by controlling the switch 30 based on the load interruption order N of each section set in step S100. At this time, the control unit 160 monitors the system status in the case of the switch 30 capable of measuring the frequency or voltage, etc. When the frequency, voltage, etc. reaches the set value, the control unit 160 opens the switch 30 after the switch 30, that is, the terminal end. Power supply to the load 40 in the direction is cut off. The control unit 160 monitors the system status in the system operating system in the case of the switch 30 which is impossible to measure frequency or voltage, and when the set value is reached, the controller 160 issues a control command to the switch 30 in the operating system to operate the switch 30. The power supply may be cut off after the switch 30, that is, the load 40 in the terminal direction.

The controller 160 determines whether to block additionally based on the required blocking amount and the total load amount of the blocked sections. At this time, if the sum of the total load of the sections blocked by the switchgear 30 in step S200 is less than the required load breaking amount (S300; No), the control unit 160 repeats the above-described step S200 to the next load breaking sequence ( Block the section corresponding to N + 1).

When the sum of the total loads of the sections cut through the control of the switchgear 30 in step S200 becomes equal to or greater than the required load breaking amount (S300; YES), the controller 160 ends the blocking of the load 40.

As described above, unlike the prior art in which a load is shut off when a load is shut off, the load is shut off by opening the switch for each section, It is possible to sequentially and partly shut off the load from the interval in which the blocking order is determined in consideration of the importance of the load and the load amount, thereby minimizing the power cut-off of the critical load.

In addition, the load shedding device and method using the switch in the power system to minimize the load interruption in the power system by setting the load shedding order of each section in consideration of the sum of the generation amount and load for each section in consideration of the generation amount of the distributed power source. It can be effective.

Here, the load shedding device and method using the switch in the power system can be used for the load supply control as well as the load shedding control.

As in the conventional load shedding method, when the entire line is cut off using the breaker, the load is supplied again. In this case, by controlling the supply by using the switch as in the present invention, if the recovery amount is limited, instead of supplying power to the unit by the circuit breaker to restore the important consumer first, instead of opening the switch after the critical load and breaker It is possible to supply more important load power than by using the circuit breaker alone.

To this end, as shown in FIG. 15, the supply order is set for each section based on the load amount of loads disposed on the lines and the generation amount of distributed power in the power system (S510), and the supply control is performed according to the set supply order. If the total load amount (that is, the control target section total load amount) of the supply target sections that are included in the target (S520) and added up according to the set supply order is equal to or lower than the supply quota (S530; No), the next target section (that is, N = n It is determined whether to be included in the supply control target for the +1 section (S540), and if the total load amount (that is, the control target section total load amount) of the sum of the supply target sections summed up according to the set supply order exceeds the supply quota (S530); For example, it may be controlled to resume power supply by setting up to a section (that is, an N-1 section) corresponding to the supply order as a load supply control target section (S550). At this time, the supply order is set in accordance with the operator's standards, such as the importance of the load and the load amount to set the supply order.

In other words, when the load is cut in such a way that the circuit breaker is cut off by opening the breaker according to the prior art, the power supply can be resumed only when the power supply is sufficient to ensure the load of the loads connected to the entire line. Can be. However, in the case of using the load supply control through the control of the switch as in the present invention, even if the power supply amount is limited, the breaker may be put in and only a part of the switch may be opened to supply power to the important load of the corresponding line first. In this case, if the switch after the important load is opened and the circuit breaker is used, a quick power supply is possible at more important loads than the method using the circuit breaker with limited recovery capacity.

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: line 20: circuit breaker
30: Actuator 40: Load
50: Distributed power supply 100: Load cutoff device
120: detecting unit 122: load detecting module
124: power generation amount detection module 140:
142: output module 144: setting module
160:

Claims (25)

The total load amount of each section of the sections constituting the lines is calculated based on the load amount of each of the loads disposed on the lines of the power system and the generation amount of each of the distributed power supplies, and the calculated total load amount and the load of each section are calculated. A setting unit for setting a load shedding order of each of the sections based on at least one of the priorities of the sections; And
And a control unit for controlling a switch or a breaker based on the load breaking sequence set by the setting unit to cut off the load for each section. The method according to claim 1,
Wherein,
When the power system fluctuates, the total load of each of the sections constituting the lines is recalculated,
The load shedding device using the switch in the power system, characterized in that for resetting the load interruption order of each of the sections based on at least one of the total amount of reload and the priority of the loads. The method according to claim 1,
Wherein,
A calculation module for calculating the total load amount for each section based on the load amount of each of the loads disposed on the lines of the power system and the generation amount of each of the distributed power supplies; And
And a setting module for setting a load shedding order of each of the sections based on at least one of the total load amount for each section calculated by the calculation module and the priority of the loads. Device. The method of claim 3,
Wherein the calculation module comprises:
The load cut-off device using the switchgear in the power system, characterized in that to add the load of the loads arranged in the section, and to calculate the total load for each section by subtracting the amount of generation of distributed power supplies arranged in the corresponding section. The method of claim 3,
The setting module,
Set the load shedding order of each of the sections based on the priority of the loads,
The load shedding device using the switchgear in the power system, characterized in that for setting the load shedding order in the order of low priority of the load arranged in each section. The method of claim 3,
The setting module,
Set the load shedding order of each of the sections based on the total load amount for each section calculated by the calculation module,
A load shedding device using a switch in a power system, characterized in that to set the load shedding order in the order of high total load. The method of claim 3,
The setting module,
The load blocking order of each of the sections is set based on the total load amount for each section calculated by the calculation module and the priority of the loads.
The load shedding order is set in the order of lower priority of loads arranged in each section, and if there is a section in which loads having the same priority are arranged, the load shedding order is set based on the total load of the corresponding section. Load breaker using switch in power system. The method of claim 7,
The setting module,
A load shedding device using a switch in a power system, characterized in that for setting the load shedding order in the order of the highest total load amount per section in the section in which loads of the same priority are arranged. The method according to claim 1,
Wherein,
Load breaker using a switch in the power system, characterized in that for receiving the priority of the loads arranged in the power system. The method according to claim 1,
The control unit,
The load shedding device using the switchgear in the power system, characterized in that to cut the load for each section according to the load shedding sequence until the total load load sum of the blocked sections is more than the required load shedding amount. The method according to claim 1,
And a detection unit for detecting the amount of load of each of the loads arranged on the lines of the power system and the amount of power generated by each of the distributed power supplies. The method of claim 11,
Wherein:
A load shedding device using a switch in a power system, characterized in that for detecting the load amount and the amount of generation when a change occurs that includes at least one of the change in the power system configuration, the establishment and destruction of the main customer, the generation amount of the distributed power generation. The method of claim 11,
Wherein:
A load detection module configured to detect a load amount of each of the loads when the power system is initially driven and when a change situation occurs; And
And a generation amount detection module for detecting the amount of generation of each of the distributed sources when the power system is initially driven and when a change occurs. Setting, by a setting unit, a load interruption order of each of the sections based on at least one of a priority of loads disposed on a line of the power system and a total load amount of each section of the sections constituting the line;
By the controller, controlling the switch or the breaker according to the set load shedding order to cut off the load for each section; And
By the controller, if the total load of the sections cut off in the blocking step is less than the required cutoff amount, cutting off the load of the section corresponding to the next load cutoff sequence; How to block. The method according to claim 14,
Setting the load shedding order,
Calculating, by the setting unit, a total load amount for each section of the sections constituting the lines based on the load amount of each of the loads disposed on the lines of the power system and the generation amount of each of the distributed power supplies. Load breaking method using a switch in the power system characterized in that. The method according to claim 14,
Setting the load shedding order,
Calculating, by the setting unit, a total load amount for each section based on the load amount of each of the loads disposed on the lines of the power system and the generation amount of each of the distributed power supplies; And
And setting, by the setting unit, a load shedding order of each of the sections based on at least one of the calculated total load amount for each section and priority of the loads. Load shedding method. 18. The method of claim 16,
In the step of calculating the total load amount for each section,
The load blocking method using the switch in the power system, characterized in that for calculating the total load for each section by subtracting the load of the loads arranged in the section, by subtracting the amount of generation of distributed power supplies arranged in the section. 18. The method of claim 16,
Setting the load shedding order,
Recalculating, by the setting unit, a total load amount for each section of the sections constituting the lines when a change in the power system occurs; And
And by the setting unit, resetting the load shedding order of each of the sections based on at least one of the total load amount for each recalculated section and the priority of the loads. Load shedding method used. The method according to claim 14,
In setting the load shedding order,
By the setting unit, to set the load shedding order of each of the intervals based on the priority of the loads,
A load shedding method using a switch in a power system, characterized in that the load shedding order is set in the order of low priority of the load arranged in each section. The method according to claim 14,
In setting the load shedding order,
By the setting unit, the load blocking order of each of the sections is set based on the total load amount of each section,
Load interruption method using a switch in the power system, characterized in that for setting the load interruption order in order of the total load amount for each section. The method according to claim 14,
In setting the load shedding order,
The setting unit sets the load blocking order of each of the sections based on the total load amount of each section and the priority of the loads.
Set the load shedding order in the order of low priority of loads arranged in each section, and if there is a section where loads with the same priority are placed, set the load shedding order based on the total load of each section of the corresponding section. Load breaking method using switchgear in power system. 23. The method of claim 21,
In setting the load shedding order,
The load blocking method using the switch in the power system, characterized in that for setting the load, the load interruption order in the order in which the total load amount in each section in the section in which the load of the same priority is arranged. The method according to claim 14,
The load breaking method using the switch in the power system, characterized in that further comprising the step of receiving the priority of the loads arranged in the power system by the setting unit. The method according to claim 14,
And detecting, by the detecting unit, a load amount of each of the loads disposed in the lines of the power system and a power generation amount of each of the distributed power supplies. 27. The method of claim 24,
In the detecting step,
The detection unit detects a load amount and a generation amount when a change situation including at least one of a change in power system configuration, a new customer and a new main customer, and a change in generation amount of a distributed power source occurs, using the switch in the power system. Load shedding method.

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