KR102520871B1 - Apparatus and method for system recovery based on voltage reduction - Google Patents

Abstract

A system recovery device and method based on voltage reduction are disclosed. In a system recovery device based on voltage reduction according to an embodiment, a power failure detection unit detects a power failure state based on a collective operation state of a load stage, and a state change extraction unit determines a time point when the power failure state is changed to a recharging state. , a load estimating unit estimating the load of the load stage during an inrush period in the recharging state, and a voltage regulator adjusting the voltage of the load stage by changing the position of a tap according to a slacter switch operation based on the load of the load stage. includes

Description

System recovery apparatus and method based on voltage reduction {APPARATUS AND METHOD FOR SYSTEM RECOVERY BASED ON VOLTAGE REDUCTION}

Disclosed embodiments relate to a system recovery technology based on voltage reduction, and more particularly, a voltage controlling the voltage of a load stage so that the load stage can be restored in the fastest time in the process of changing from a blackout state to a normal state. It relates to a system recovery device and method based on reduction.

In the operation of the power system, system recovery is one of the important parts. The distribution system, which is part of the power system, is designed to handle the maximum load by using some reserve capacity and is operated to prevent overload in an emergency. In order to prevent overload, there is a need to respond through simultaneous operation cutoff through an automatic control device capable of automatically on/off operation according to the situation of the system.

In addition, there is a need to efficiently restore the system even in case of an emergency as well as changes due to use of equipment. Specifically, when the system is restored after a power outage, an overload is applied to the distribution system according to the ON operation of the corresponding device, and the need to operate the power system to withstand the load surge called inrush current (Cold Load Pickup, CLPU) at this time is necessary. there is.

However, most of the existing technologies for the above problems are focused only on a strategy for determining an optimal switching sequence to sequentially restore a power failure system, and it is difficult to find research on reducing inrush current.

Korean Patent Publication No. 10-2017-0142238 (published on December 28, 2017) relates to a power supply system for preparing for a power outage, and in more detail, is connected between a first power supply and a first load, and the first an uninterruptible power supply (UPS) for outputting second power replacing the first power from the power source; a first switch provided between the uninterruptible power supply and the first load; And a second switch provided between a node between the first switch and the first load and a second load, wherein each of the first load and the second load is one of the first power and the second power. At least one is provided, and the uninterruptible power supply device relates to a power system controlling connection or disconnection of each of the first switch and the second switch.

Korean Patent Publication No. 10-2015-0116406 (published on October 15, 2015) relates to a load detection method and a power supply device to which the same is applied, and more specifically, based on a detection voltage corresponding to the output voltage of the power supply device. determining whether a load detection operation is required, estimating a specific time point during a first period during which an output voltage of the power supply device decreases from a first level to a second level when the load detection operation is required; and and applying a test signal to the output voltage for a predetermined detection period based on the specific time point, wherein a switching operation of a power switch of the power supply device does not occur during the first period. .

Korean Patent Publication No. 10-2017-0142238 (published on December 28, 2017) Korean Patent Publication No. 10-2015-0116406 (published on October 15, 2015)

The disclosed embodiments are intended to prevent an overload state by estimating a cold load pick up (CLPU) in a power system recovery process after a blackout.

In addition, the disclosed embodiments are intended to minimize the effect of inrush current during a restoration process through voltage reduction compensation for inrush current in a power system recovery process after a blackout.

In addition, the disclosed embodiments are intended to rapidly provide load recovery for a power system by minimizing an effect on an inrush current in a power system recovery process after a blackout.

A system recovery device based on voltage reduction according to an embodiment includes a power failure detection unit that detects a power failure state based on a collective operation state of a load stage; a state change extractor extracting a time point at which the power failure state is changed to a recharging state; a load estimating unit estimating a load of the load stage during an inrush section in the recharging state; and a voltage adjusting unit configured to adjust a voltage at the load terminal by changing a position of a tap according to a Slackter switch operation based on the estimated load.

The power failure detection unit may detect the power failure state by classifying a case where the state of the load terminal is changed from a normal operation state to a first power failure state and a case where the state is changed from a power off state to a second power failure state.

The state change extractor may extract, as the recharging state, a time when the power load of the load stage changes from a power failure state to a state having more power loads than the normal operation state.

The rush section may be a section between a time point at which the recharging state is changed to the normal driving state.

The load estimator may estimate the load of the load stage based on a difference between a power load in the normal operation state and an inrush power load in the recharging state.

The load stages may be classified into sub-load stages according to a plurality of groups, and the voltage adjusting unit may adjust the voltage for each sub-load stage.

The voltage adjusting unit may control the slackter switch so that the load stage is restored to the normal operation state within an optimal time by comparing the load of the load stage with a limiting power amount of the power supply network in the recharging state.

A first step of comparing the estimated load and the limit power amount by the voltage adjusting unit; a second step of lowering the voltage for each sub-load stage when the estimated load is greater than the limit power amount; a third step of extracting a violating load stage that does not satisfy a voltage condition according to the second step; and the voltage of the load stage may be adjusted through a fourth step of restoring the voltage of the offending load stage to a voltage prior to voltage control.

A system recovery method based on voltage reduction according to an embodiment includes a power failure detection step of detecting a power failure state based on a collective operating state of a load stage; a state change extraction step of extracting a time point at which the power failure state is changed to a recharging state; a load estimating step of estimating a load of the load stage during an inrush section in the recharging state; and a voltage adjusting step of adjusting the voltage at the load end by changing the position of a tap according to a Slackter switch operation based on the estimated load.

In the detecting of the power failure, the power failure state may be detected by dividing a case in which the state of the load stage is changed from a normal operation state to a first power failure state and a case where the state is changed from a power-off state to a second power failure state.

In the state change extraction step, a time point when the power load of the load stage changes from a power failure state to a state in which the power load in the normal operation state is greater than the power load in the normal operation state may be extracted as the recharging state.

The rush section may be a section between a time point at which the recharging state is changed to the normal driving state.

In the load estimating step, the load of the load stage may be estimated based on a difference between a power load in the normal operation state and an inrush power load in the recharging state.

The load stages may be classified into sub-load stages according to a plurality of groups, and the voltage adjusting step may adjust the voltage for each sub-load stage.

In the voltage regulating step, the load of the load stage in the recharging state may be compared with a limit power amount of the power supply network, and the slackter switch may be controlled so that the load stage is restored to the normal operation state within an optimal time.

The voltage adjusting step may include a first step of comparing the estimated load and the limit power amount; a second step of lowering the voltage for each sub-load stage when the estimated load is greater than the limit power amount; a third step of extracting a violating load stage that does not satisfy a voltage condition according to the second step; and a fourth step of restoring the violating load stage to a voltage prior to voltage control.

The disclosed technology may have the following effects. However, it does not mean that a specific embodiment must include all of the following effects or only the following effects, so it should not be understood that the scope of rights of the disclosed technology is limited thereby.

According to the disclosed embodiments, an overload state can be prevented by estimating a cold load pick up (CLPU) in a process of restoring a power system after a blackout.

In addition, according to the disclosed embodiments, the effect of inrush current during the recovery process can be minimized through voltage reduction compensation for the inrush current in the power system recovery process after power outage.

In addition, the disclosed embodiments can provide load recovery for the power system quickly by minimizing the effect on the inrush current in the process of restoring the power system after power outage.

1 is a diagram illustrating a system recovery system based on voltage reduction according to an exemplary embodiment;
2 is a block diagram illustrating a system recovery device based on voltage reduction according to an exemplary embodiment;
3 is a flowchart illustrating a system recovery method based on voltage reduction according to an embodiment
4 is a flowchart illustrating a system recovery method based on voltage reduction according to another embodiment
5 is a graph illustrating an inrush load according to an embodiment
6 is a diagram illustrating a sub-load terminal and voltage control according to an exemplary embodiment;
7 is a block diagram for illustrating and describing a computing environment including a computing device according to an exemplary embodiment;

Hereinafter, specific embodiments will be described with reference to the drawings. The detailed descriptions that follow are provided to provide a comprehensive understanding of the methods, devices and/or systems described herein. However, this is only an example and disclosed embodiments are not limited thereto.

In describing the embodiments, if it is determined that a detailed description of related known technologies may unnecessarily obscure the gist of the disclosed embodiments, the detailed description will be omitted. In addition, terms to be described later are terms defined in consideration of functions in the disclosed embodiments, which may vary according to intentions or customs of users or operators. Therefore, the definition should be made based on the contents throughout this specification. Terminology used in the detailed description is only for describing the embodiments and should in no way be limiting. Unless expressly used otherwise, singular forms of expression include plural forms. In this description, expressions such as "comprising" or "comprising" are intended to indicate any characteristic, number, step, operation, element, portion or combination thereof, one or more other than those described. It should not be construed to exclude the existence or possibility of any other feature, number, step, operation, element, part or combination thereof.

In the illustrated embodiment, each component may have different functions and capabilities other than those described below, and may include additional components other than those described below.

1 is a diagram illustrating a system recovery system 100 based on voltage reduction according to an embodiment of the present invention.

Referring to FIG. 1 , the system recovery system 100 based on voltage reduction may include a user terminal 110, a system recovery device 130 based on voltage reduction, and a database 150.

The user terminal 110 may correspond to a computing device capable of checking and detecting a power failure state of a load stage, and confirming and managing power system recovery according to recovery of the power failure state, and may be implemented as a smart phone, a laptop computer, or a computer. It may be, but is not necessarily limited thereto, and may be implemented in various devices such as a tablet PC. The user terminal 110 may be connected to the voltage reduction-based system recovery device 130 through a network, and a plurality of user terminals 110 may be simultaneously connected to the voltage reduction-based system recovery device 130.

The voltage reduction-based system recovery device 130 detects a power outage state at the load stage, estimates the load at the load stage in a recharging state, and operates a computer or program that adjusts the voltage at the corresponding load stage based on the estimated load. It can be implemented as a corresponding server. The voltage reduction-based system recovery device 130 may be wirelessly connected to the user terminal 110 through Bluetooth, WiFi, or a communication network, and may exchange data with the user terminal 110 through the network.

The database 150 is a storage device for storing various information required in the process of detecting a power outage state of a load stage, estimating a load of a load stage in a recharging state, and adjusting the voltage of a corresponding load stage based on the estimated load. may correspond to In addition, in the database 150, the grid recovery device 130 based on voltage reduction performs pre-processing on the input data set, generates a power generation prediction model based on the pre-processed property features, and generates a power generation prediction model based on the corresponding power generation prediction model. In the process of predicting the amount of power generation, collected or processed information in various forms can be stored.

2 is a block diagram illustrating a system recovery device 130 based on voltage reduction according to an exemplary embodiment.

Referring to FIG. 2 , the grid recovery device 130 based on voltage reduction includes a power failure detection unit 131, a state change extraction unit 133, a load estimation unit 135, a voltage regulation unit 137, and a control unit 139. can include

The power failure detection unit 131 may detect a power failure state based on the collective operation state of the load stage. For example, the power failure detection unit 131 may determine a power failure state when the power loads of all load stages become zero. More specifically, the power failure detection unit 131 may determine a power failure state when all devices constituting the load stage are turned off, not on/off each of the devices constituting the load stage.

In one embodiment, the power failure detection unit 131 may detect a power failure state by dividing a case where the state of the load terminal is changed from a normal operation state to a first power failure state and a case where the state is changed from a power off state to a second power failure state. there is. For example, the power failure detection unit 131 may detect a power failure state by dividing a first sub load stage changed to a first power failure state and a second sub load stage changed to a second power failure state among load stages. More specifically, the power failure detection unit 131 may divide and provide targets for adjusting the voltage in the voltage regulator 137 into the first sub-load stage and the second sub-load stage, and a specific voltage adjustment method is provided below. explained in

In another embodiment, the power failure detection unit 131 may detect a power failure state of the second sub-load stage according to a change in the power load of the first sub-load stage. For example, the power failure detection unit 131 determines the power failure state for the first sub-load stage and the second sub-load stage, which are the components of the load stage, when the power load of the first sub-load stage is changed to 0, the entire corresponding load stage. It can be determined that the electrostatic state for

The state change extractor 133 may extract a time point at which the blackout state is changed to the recharged state. For example, when the power load is collectively changed from 0 to a specific value or more while the power of the load end device is turned on, the state change extractor 133 changes the power load change point from the power failure state to the recharging state. point can be determined. Referring to FIG. 5 , it is possible to check the power load of the load stage in a normal driving state 501 , a power failure state 502 , and a recharging state 503 , according to an embodiment.

In one embodiment, the state change extractor 133 may extract a time point when the power load of the load stage changes from a power failure state to a state greater than the power load in the normal operation state as a recharging state. For example, the state change extractor 133 does not simply extract the recharged state by simply changing the power load of the load stage from 0, but when a load higher than the normal operating state 501 occurs at the load stage. In this case, the load generation time point may be determined as the recharging state 503 .

The load estimator 135 may estimate the load of the load stage during the rush period in the recharging state. The rush section is the time from the time the load stage enters the recharging state 503 to the time it reaches the normal operating state 501, and during that section, a higher load than the normal operating state 501 may occur on the load stage. .

In one embodiment, the rush section may be a section between a time point at which the recharging state is changed to the normal driving state. Specifically, during the inrush period, a high load is generated at the load end, and the amount of remaining power in the power supply network may be insufficient. The load estimator 135 may estimate an insufficient amount of power according to a difference between the load applied to the load end during the rush section and the load applied to the load end in the normal operation state.

In one embodiment, the load estimator 135 may estimate the load during the rush period through a machine learning model based on pre-generated data. For example, the load estimator 135 collects the power consumption of each device, which is a component of the load stage, determines a high ratio of power consumption during the inrush section compared to the normal operation state, and determines the on/off state of each device. The load of the load stage can be estimated.

In one embodiment, the load estimator 135 may estimate the load at the load stage based on the difference between the power load in the normal driving state and the inrush power load in the recharging state. For example, the load estimator 135 may estimate the number of powered-on devices according to the load load in the normal operation state before the power failure state, and estimate the inrush power load based on the number of corresponding devices. The load estimator 135 may estimate the load of the load stage based on the ratio of the power load in the normal operating state and the inrush power load for each single device at the load stage. The ratio may be determined by the user.

The voltage adjusting unit 137 may adjust the voltage at the load end by changing the position of the tap according to the Slackter switch operation based on the estimated load. The voltage adjusting unit 137 can adjust the capacitor at the load stage according to the position of the Slackter switch, and can adjust the voltage at the load stage according to the size of the capacitor. Here, the location of the tap may vary according to the size of the capacitor. That is, the voltage regulator 137 may adjust the voltage of the load terminal by adjusting the position of the tap of the load terminal to adjust the size of the capacitor of the corresponding load terminal, if necessary.

For example, when the estimated load is greater than the remaining amount of power, the voltage adjuster 137 may restore the power system of the load stage by lowering the voltage for each sub-load stage. However, for the sub-load stage that does not satisfy the voltage condition, the voltage regulator 137 may change the voltage for the corresponding sub-load stage to the voltage of the control branch and postpone system recovery for the corresponding sub-load stage to a later priority.

In one embodiment, the load stage is divided into sub-load stages according to a plurality of groups, and the voltage adjusting unit 137 may adjust the voltage for each sub-load stage. Referring to FIG. 6 , the load stage 610 may be divided into a plurality of sub load stages 611 , 612 , and 613 . For example, the voltage regulator 137 adjusts the voltage level for the first sub-load terminal 611 of FIG. 6 and adjusts the voltage level for the remaining second to third sub-load terminals 612 and 613. may not

In one embodiment, the voltage regulator 137 compares the load of the load stage with the limit power amount of the power supply network in a recharging state and controls the slackter switch so that the load stage is restored to the normal operation state within an optimal time. can The limit power amount may be a concept including remaining power amount and power supply amount. For example, the voltage regulator 137 adjusts the voltage of the load stage through the Slackter switch control when the load of the load stage is greater than the limit power amount in the recharging state, and the load of the load stage is the limit in the recharging state. If the amount of power is not greater than the amount of power, the slacker switch control may not be performed. For example, the voltage regulator 137 may perform voltage control for some sub-load stages and not perform voltage control for the remaining sub-load stages when the load of the load stage is greater than the limit power amount in the recharging state. . Accordingly, the voltage regulator 137 may maximize the number of sub-load stages for restoring the power load.

In one embodiment, the voltage regulator 137 is a first step of comparing the estimated load and the limit power amount, a second step of lowering the voltage for each sub-load stage when the estimated load is greater than the limit power amount, the The voltage of the load stage may be adjusted through the third step of extracting the violating load stage that does not satisfy the voltage condition according to the second step and the fourth step of restoring the voltage of the violating load stage to the voltage before the voltage control. In one embodiment, power consumption within the system may be displayed according to [Equation 1].

[Equation 1]

는 전체 부하에 대한 정 임피던스,

는 전체 부하에 대한 정 전류,

는 전체 부하에 대한 정 전력,

는 이전 선간 전압 레벨,

는 새로운 선간 전압 레벨,

는

에서의 유효 소비 전력,

는

에서의 무효 소비 전력,

는

에서의 유효 소비 전력,

는

에서의 무효 소비 전력을 나타낸다.At this time,

is the constant impedance for the entire load,

is the constant current for full load,

is the constant power for full load,

is the previous line voltage level,

is the new line voltage level,

Is

active power consumption at

Is

reactive power consumption at ,

Is

active power consumption at

Is

Indicates the reactive power consumption in

In an embodiment, the load stage must satisfy [Equation 2], and the voltage regulator 137 may not perform voltage control for the load stage that does not satisfy [Equation 2].

[Equation 2]

For example, when the voltage is adjusted under the condition that [Equation 2] is satisfied, the voltage regulator 137 can reduce the corresponding constant impedance and constant current, thereby reducing the load at the load end. .

It controls the overall operation of the grid recovery device 130 based on voltage reduction, and the control flow or data flow between the power failure detection unit 131, the state change extraction unit 133, the load estimation unit 135, and the voltage regulation unit 137 can manage

3 is a flowchart illustrating a system recovery method based on voltage reduction according to an embodiment. The method shown in FIG. 3 may be performed by, for example, the above-described voltage reduction-based system recovery device 130 .

Referring to FIG. 3 , the grid recovery device 130 based on voltage reduction may detect a power outage state based on a collective operation state of a load stage through a power outage detection unit 131 (310).

Then, the voltage reduction-based system recovery device 130 through the state change extractor 133. A time point at which the power failure state is changed to the recharging state may be extracted (320).

Thereafter, the system recovery device 130 based on voltage reduction may estimate the load at the load end during the inrush period in the recharging state through the load estimator 135 (330).

Thereafter, the system recovery device 130 based on voltage reduction may adjust the voltage at the load end by changing the position of the tap according to the slacter switch operation based on the estimated load through the voltage regulator 137 (340). .

4 is a flowchart illustrating a sequence of a system recovery method based on voltage reduction according to another embodiment. The method shown in FIG. 4 may be performed by, for example, the above-described voltage reduction-based system recovery device 130 .

Referring to FIG. 4 , the system recovery apparatus 130 based on voltage reduction may estimate the inrush load of each load stage through the load estimator 135 (410). Here, the inrush load may be a load generated at the load end in a recharging state.

Thereafter, the grid recovery device 130 based on voltage reduction may determine the limit power load of the power system through the voltage regulator 137 (420).

Thereafter, the voltage reduction-based system recovery device 130 may restore the power load for each sub-load stage through the voltage regulator 137 (430). In this step, the voltage regulator 137 may restore the power load for all load stages. A load stage and a sub-load stage recovered in the corresponding step may be determined according to a user's design. For example, the load stage to be restored in the corresponding step may be determined based on pre-learned data and may be determined according to simulation results.

Thereafter, the voltage reduction-based system recovery device 130 may determine, through the voltage regulator 137, whether the inrush load of the load stage determined to be restored in the previous step is greater than the limit power load of the power system (440). ).

Thereafter, the voltage reduction-based system recovery device 130 may control the power loads of the load and sub-load stages when it is determined that the inrush load is greater than the limit power load in step 440 through the voltage regulator 137 ( 450). In this step, control of the power load by the voltage regulator 137 may be performed for all load stages, or may be performed only for some sub-load stages, if necessary.

Thereafter, the voltage reduction-based system recovery device 130 may determine whether the voltage at each load stage corresponds to a violation according to the power load control performed in the previous step through the voltage regulator 137 (460). For example, the voltage regulator 137 determines whether the voltage of the corresponding load stage is in violation, if the static power of the corresponding load stage satisfies [Equation 2], it is not a violation, and [Equation 2] is not satisfied. Failure to do so may be considered a violation.

The voltage reduction-based grid restoration device 130 may restore the power load for the corresponding load to the voltage level prior to control when a voltage violation at the load stage is detected in step 460 through the voltage regulator 137. (461). For example, the voltage of the corresponding load stage is not adjusted by the voltage regulator 137, load recovery may be performed sequentially as needed, and the voltage of the corresponding load stage may remain in a power failure state for a specific time.

The grid recovery device 130 based on voltage reduction can maximize the number of sub-load stages to which power loads are restored when the load-end voltage is not violated in step 460 and when the inrush load is not greater than the limit power in step 440. Yes (470). For example, when steps 460 and 470 are sequentially performed, the system recovery apparatus 130 based on voltage reduction may restore power loads to all load terminals selected in step 430 . For another example, in the case of sequentially progressing from step 461 to step 470, the voltage reduction-based grid recovery device 130 only applies to load terminals other than the load terminal determined to be voltage violation in step 460 among the load terminals selected in step 430. The power load can be restored.

Thereafter, the system recovery device 130 based on voltage reduction may determine whether all load stages are restored (480). When all the load stages are not restored in the corresponding step, the process returns to step 430, but the operation of step 430 may be performed only for the load stage whose power load has not been restored. When it is determined that restoration of all load terminals has been performed in the corresponding step, the voltage reduction-based system restoration device 130 may stop restoration of the voltage load.

In FIGS. 3 and 4 shown above, the method is divided into a plurality of steps, but at least some of the steps are performed in reverse order, performed together with other steps, omitted, or divided into detailed steps. , Or one or more steps not shown may be added and performed.

7 is a block diagram for illustrating and describing a computing environment 10 including a computing device according to an exemplary embodiment. In the illustrated embodiment, each component may have different functions and capabilities other than those described below, and may include additional components other than those described below.

The illustrated computing environment 10 includes a computing device 12 . In one embodiment, the computing device 12 may be a device that reduces the voltage at the load stage (eg, the system recovery device 130 based on voltage reduction).

Computing device 12 includes at least one processor 14 , a computer readable storage medium 16 and a communication bus 18 . Processor 14 may cause computing device 12 to operate according to example embodiments. For example, processor 14 may execute one or more programs stored on computer readable storage medium 16 . The one or more programs may include one or more computer-executable instructions, which when executed by processor 14 are configured to cause computing device 12 to perform operations in accordance with an illustrative embodiment. It can be.

Computer-readable storage medium 16 is configured to store computer-executable instructions or program code, program data, and/or other suitable form of information. Program 20 stored on computer readable storage medium 16 includes a set of instructions executable by processor 14 . In one embodiment, computer readable storage medium 16 includes memory (volatile memory such as random access memory, non-volatile memory, or a suitable combination thereof), one or more magnetic disk storage devices, optical disk storage devices, flash memory devices, other forms of storage media that can be accessed by computing device 12 and store desired information, or any suitable combination thereof.

Communications bus 18 interconnects various other components of computing device 12, including processor 14 and computer-readable storage medium 16.

Computing device 12 may also include one or more input/output interfaces 22 and one or more network communication interfaces 26 that provide interfaces for one or more input/output devices 24 . An input/output interface 22 and a network communication interface 26 are connected to the communication bus 18 . Input/output device 24 may be coupled to other components of computing device 12 via input/output interface 22 . Exemplary input/output devices 24 include a pointing device (such as a mouse or trackpad), a keyboard, a touch input device (such as a touchpad or touchscreen), a voice or sound input device, various types of sensor devices, and/or a photographing device. input devices, and/or output devices such as display devices, printers, speakers, and/or network cards. The exemplary input/output device 24 may be included inside the computing device 12 as a component constituting the computing device 12, or may be connected to the computing device 12 as a separate device distinct from the computing device 12. may be

Meanwhile, embodiments of the present invention may include a program for performing the methods described in this specification on a computer, and a computer readable recording medium including the program. The computer readable recording medium may include program instructions, local data files, local data structures, etc. alone or in combination. The media may be specially designed and configured for the present invention, or may be commonly available in the field of computer software. Examples of computer-readable media include magnetic media such as hard disks, floppy disks and magnetic tapes, optical media such as CD-ROMs and DVDs, and specially configured to store and execute program instructions such as ROM, RAM, and flash memory. Hardware devices are included. Examples of the program may include not only machine language codes generated by a compiler, but also high-level language codes that can be executed by a computer using an interpreter.

Although representative embodiments of the present invention have been described in detail above, those skilled in the art will understand that various modifications are possible to the above-described embodiments without departing from the scope of the present invention. . Therefore, the scope of the present invention should not be limited to the described embodiments and should not be defined, and should be defined by not only the claims to be described later, but also those equivalent to these claims.

10: Computing environment
12: computing device
14: Processor
16: computer readable storage medium
18: communication bus
20: program
22: I/O interface
24: I/O device
26: network communication interface
100: grid recovery system based on voltage reduction
110: user terminal
120: network
130: voltage reduction-based grid recovery device
131: power failure detection unit
133: state change extraction unit
135: load estimation unit
137: voltage regulator
139: control unit
140: database

Claims (16)

a power failure detection unit that detects a power failure state based on a collective operation state of the load stage;
a state change extractor extracting a time point at which the power failure state is changed to a recharging state;
a load estimating unit estimating a load of the load stage during an inrush section in the recharging state; and
A voltage regulator configured to adjust the voltage at the load end by changing the position of a tap according to a slackter switch operation based on the estimated load;
The electrostatic detection unit,
detecting the power failure state by dividing a case in which the state of the load terminal is changed from a normal operation state to a first power failure state and a case where the state is changed from a power off state to a second power failure state;
The load is
It is divided into sub-loads according to a plurality of groups,
The voltage regulator,
The voltage is adjusted for each sub-load stage,
The voltage regulator,
In the recharging state, the load of the load stage is compared with the limit power amount of the power supply network to control the slackter switch so that the load stage is restored to the normal operation state within an optimal time;
The voltage regulator,
A first step of comparing the estimated load with the limit amount of power; a second step of lowering the voltage for each sub-load stage when the estimated load is greater than the limit power amount; a third step of extracting a violating load stage that does not satisfy a voltage condition according to the second step; and for the violating load stage, adjusting the voltage of the load stage excluding the extracted violating load stage through a fourth step of restoring the voltage to a voltage before the voltage control;
The third step,
According to the second step, a sub-load stage whose voltage does not satisfy the following equation for each sub-load stage is extracted as the violating load stage,
The voltage regulator,
The system recovery device based on voltage reduction, which adjusts the voltage of the violating load stage after adjusting the voltage of the load stage excluding the extracted violating load stage.
[mathematical expression]

(here,

is the constant impedance for the entire load,

is the constant current for full load,

is the constant power for full load)
delete The method of claim 1,
The state change extraction unit,
A voltage reduction-based system recovery device for extracting a time when the power load of the load stage changes from a power failure state to a state greater than the power load in the normal operation state as the recharging state.
The method of claim 1,
The inrush section is
A voltage reduction-based system recovery device that is an interval between a time point at which the recharging state is changed to the normal operating state.
The method of claim 1,
The load estimation unit,
A voltage reduction-based system recovery device for estimating a load at the load stage based on a difference between a power load in the normal operation state and an inrush power load in the recharging state.
delete delete delete a power failure detection step of detecting a power failure state based on a collective operating state of the load stage;
a state change extraction step of extracting a time point at which the power failure state is changed to a recharging state;
a load estimating step of estimating a load of the load stage during an inrush section in the recharging state; and
A voltage adjustment step of adjusting the voltage at the load end by changing the position of a tap according to a slackter switch operation based on the estimated load,
The power failure detection step,
detecting the power failure state by dividing a case in which the state of the load terminal is changed from a normal operation state to a first power failure state and a case where the state is changed from a power off state to a second power failure state;
The load is
It is divided into sub-loads according to a plurality of groups,
The voltage adjustment step,
The voltage is adjusted for each sub-load stage,
The voltage adjustment step,
In the recharging state, the load of the load stage is compared with the limit power amount of the power supply network to control the slackter switch so that the load stage is restored to the normal operation state within an optimal time;
The voltage adjustment step,
A first step of comparing the estimated load with the limit amount of power;
a second step of lowering the voltage for each sub-load stage when the estimated load is greater than the limit power amount;
a third step of extracting a violating load stage that does not satisfy a voltage condition according to the second step;
a fourth step of restoring the voltage of the offending load stage to a voltage before voltage control; and
And a fifth step of adjusting the voltage of the load stage excluding the extracted violating load stage,
The third step,
According to the second step, a sub-load stage whose voltage does not satisfy the following equation for each sub-load stage is extracted as the violating load stage,
The voltage adjustment step,
The system recovery method based on voltage reduction further comprising a sixth step of adjusting the voltage of the violating load terminal after the fifth step.
[mathematical expression]

(here,

is the constant impedance for the entire load,

is the constant current for full load,

is the constant power for full load)
delete The method of claim 9,
The state change extraction step,
A voltage reduction-based system recovery method of extracting a time when the power load of the load stage changes from a power failure state to a state greater than the power load in the normal operation state as the recharging state.
The method of claim 9,
The inrush section is
A grid recovery method based on voltage reduction, which is an interval between a time point at which the recharging state is changed to the normal operating state.
The method of claim 9,
In the load estimation step,
A voltage reduction-based grid recovery method for estimating a load at the load stage based on a difference between a power load in the normal operation state and an inrush power load in the recharging state.
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