KR20230010961A - Optimal voltage control device and method of distributed power supply - Google Patents

Abstract

According to an embodiment of the present invention, provided is an apparatus for controlling an optimal voltage of distributed power. The apparatus for controlling an optimal voltage of distributed power, which can maximize a voltage control effect, includes: a communication unit which receives connection point voltage values from control devices installed in a distribution line (D/L); a data processing unit which aligns the connection point voltage values according to order in which the control devices are disposed on the D/L to generate a voltage profile; a first processing unit which processes an occurrence of an abnormal state when at least one connection point voltage value of the connection point voltage values deviates from a pre-set range of a connection point reference voltage; a second processing unit which searches for a lowest connection point voltage value in the voltage profile when the abnormal state occurs and selects a control device subordinated more than the lowest connection point voltage value as a target to be controlled; and a third processing unit which calculates the amount of control of the control device selected as the target to be controlled and then transmits the calculated amount of control through the communication unit.

Description

Distributed power supply optimal voltage control device and method {Optimal voltage control device and method of distributed power supply}

An embodiment of the present invention relates to an apparatus and method for controlling an optimal voltage of a distributed power supply.

Recently, with the rapid increase in power demand, the expansion of power infrastructure has emerged as a very important issue. The increase in power demand is due to the increase in electrical loads for commercial buildings and factories along with the increase in household appliances that use electricity. In the case of such power demand, the power load used in a specific season and a specific time zone rapidly increases, resulting in a shortage of standby power at all times and causing accidents such as power outages. In order to prevent the occurrence of these problems, various attempts have been made, such as expanding power infrastructure and limiting its use.

As one of the measures to solve this problem, a method using alternative energy or natural clean energy such as solar power, wind power, solar heat, wave power, geothermal power generation, and thermal power generation using methane gas is attracting attention. In particular, solar power, wind power, and solar heat are relatively simple facilities and are suitable for the situation in Korea, so the installation and operation are also supported by the state.

However, despite this situation, it is a reality that distributed power generation facilities and operations using clean energy or renewable energy are not active. This is mainly due to problems with the installation of distributed generation facilities and difficulty in linking with the power system. That is, in order to connect distributed generation facilities having a smaller amount of power generation than existing power generation facilities to the power system, they must be directly connected or a device such as a power converter must be used.

On the other hand, considerations for linking distributed power include voltage fluctuation, frequency, harmonics, etc. at linking points for the power quality of the distribution system. When the distributed power source is connected to the distribution system, since the power is supplied from the distributed power source to the grid, the voltage at the connection point rises above the allowable value due to the influence of the current of the distributed power source and the impedance of the system. Such an excessive voltage at the connection point not only adversely affects power quality, but also lowers the possibility of connection of other distributed power sources due to an increase in the voltage at the connection point.

Therefore, research is being conducted to increase the efficiency of a grid interconnection system that connects the output of distributed generation such as solar power generation or wind power generation to a commercial grid (commercial line supplied by an electric power company) and operates in tandem.

In the existing voltage control method, voltage control is implemented by monitoring only the voltage change at the linkage point. way. However, since there is a power factor limitation according to the standard of distributed power supply connection technology, there is a problem that it may not return to the normal range because the reactive power output is limited according to the capacity of the distributed power supply (inverter).

In addition, there is a problem that only the voltage control for the distributed power source at the end of the line is performed, causing deterioration in electrical quality.

A technical problem to be achieved by the present invention is to provide a distributed power supply optimum voltage control device and method capable of maximizing the voltage control effect.

In addition, an apparatus and method for controlling an optimum voltage of a distributed power supply capable of alleviating the bias in the number of times of control of a distributed power supply located at an end of a line are provided.

According to the embodiment, the communication unit for receiving the connection point voltage value from the control device installed in the distribution line (D / L); a data processing unit for generating a voltage profile by arranging connection point voltage values according to the order in which the control device is disposed on the distribution line; a first processing unit for processing that an abnormal state has occurred when at least one of the linkage point voltage values is out of a preset linkage point reference voltage range; a second processing unit for searching for a lowest linkage point voltage value in the voltage profile and selecting a control device having a lower priority than the lowest linkage point voltage value as a control target when the abnormal state occurs; and a third processing unit for calculating a control amount of the control device selected as the control target and then transmitting the calculated control amount through the communication unit.

The data processing unit may generate the voltage profile by arranging received connection point voltage values according to an order in which the control devices are arranged in a direction of a line end direction from a substation.

The second processing unit may select all control devices disposed in the direction of the end of the line as the control target based on the control device for which the lowest connection point voltage value is measured.

The third processing unit may calculate the power factor value for each control device that is the control target and transmit the power factor value through the communication unit.

The first processing unit may determine whether or not an abnormal state has occurred by using an association point voltage value received after transmission of the power factor value.

When the abnormal state reoccurs, the second processing unit searches for the lowest linkage point voltage value in the voltage profile, selects a control device that is subordinate to the lowest linkage point voltage value as a control target, and the third processing unit searches for the lowest linkage point voltage value. After adjusting the power factor value transmitted to , the adjusted power factor value may be retransmitted through the communication unit.

According to the embodiment, the step of receiving the connection point voltage value from the control device installed in the distribution line (D / L) by the communication unit; generating a voltage profile by a data processing unit by arranging connection point voltage values according to the order in which the control device is disposed on the distribution line; processing, by a first processing unit, that an abnormal state has occurred when at least one of the linkage point voltage values is out of a predetermined linkage point reference voltage range; retrieving, by a second processing unit, a lowest linkage point voltage value from the voltage profile when the abnormal state occurs; selecting, by the second processing unit, a control device having a lower priority than the lowest linkage point voltage value as a control target; calculating a control amount of the control device selected as the control target by a third processing unit; and transmitting the calculated control amount through the communication unit.

The generating of the voltage profile may include generating the voltage profile by arranging received connection point voltage values according to an order in which the control devices are arranged in a direction of a line end, starting from a substation.

In the selecting as the control target, all control devices disposed in the direction of the end of the line may be selected as the control target based on the control device for which the lowest connection point voltage value is measured.

The transmitting of the calculated control amount may include calculating a power factor value for each control device as the control target.

performing inverter control using the power factor value received by the control device; transmitting the connection point voltage value measured by the control device to the communication unit; receiving, by a communication unit, a linkage point voltage value from a control device installed in a distribution line (D/L); and determining, by the first processing unit, whether or not an abnormal state has occurred by using an associated point voltage value received after transmitting the power factor value.

searching for the lowest linkage point voltage value in the voltage profile when the abnormal state reoccurs; selecting, by the second processing unit, a control device having a lower priority than the lowest linkage point voltage value as a control target; Adjusting the previously transmitted power factor value by the third processing unit; and retransmitting the adjusted power factor value through the communication unit.

According to an embodiment, a computer-readable recording medium in which a program for executing the above-described method is recorded on a computer is provided.

An apparatus and method for controlling an optimum voltage of a distributed power supply according to the present invention can maximize a voltage control effect.

In addition, it is possible to alleviate the bias phenomenon of the number of distributed power supply control located at the end of the line.

1 is a diagram for explaining a photovoltaic power generation system according to an embodiment.
2 is a diagram for explaining a power distribution system including distributed power sources according to an embodiment.
3 is a block diagram of a distributed power supply optimum voltage control device according to an embodiment.
4 to 6 are diagrams for explaining the operation of the distributed power supply optimum voltage control device according to the embodiment.
7 is a flowchart of a distributed power supply optimum voltage control method according to an embodiment.
8 is a configuration block diagram of a control device according to an embodiment.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

However, the technical idea of the present invention is not limited to some of the described embodiments, but may be implemented in a variety of different forms, and if it is within the scope of the technical idea of the present invention, one or more of the components among the embodiments can be selectively implemented. can be used by combining and substituting.

In addition, terms (including technical and scientific terms) used in the embodiments of the present invention, unless explicitly specifically defined and described, can be generally understood by those of ordinary skill in the art to which the present invention belongs. It can be interpreted as meaning, and commonly used terms, such as terms defined in a dictionary, can be interpreted in consideration of contextual meanings of related technologies.

Also, terms used in the embodiments of the present invention are for describing the embodiments and are not intended to limit the present invention.

In this specification, the singular form may also include the plural form unless otherwise specified in the phrase, and when described as "at least one (or more than one) of A and (and) B and C", A, B, and C are combined. may include one or more of all possible combinations.

Also, terms such as first, second, A, B, (a), and (b) may be used to describe components of an embodiment of the present invention.

These terms are only used to distinguish the component from other components, and the term is not limited to the nature, order, or order of the corresponding component.

In addition, when a component is described as being 'connected', 'coupled' or 'connected' to another component, the component is not only directly connected to, combined with, or connected to the other component, but also with the component. It may also include the case of being 'connected', 'combined', or 'connected' due to another component between the other components.

In addition, when it is described as being formed or disposed on the "top (above) or bottom (bottom)" of each component, the top (top) or bottom (bottom) is not only a case where two components are in direct contact with each other, but also one A case in which another component above is formed or disposed between two components is also included. In addition, when expressed as "up (up) or down (down)", it may include the meaning of not only an upward direction but also a downward direction based on one component.

Hereinafter, the embodiments will be described in detail with reference to the accompanying drawings, but the same or corresponding components regardless of reference numerals are given the same reference numerals, and overlapping descriptions thereof will be omitted.

Distributed power generation is a system that generates power using energy sources. The distributed power source can supply the generated power to an energy storage system (ESS). The distributed power source may include a photovoltaic power generation system, a wind power generation system, a tidal power generation system, and the like, and may include all other power generation systems that generate power using renewable energy using solar heat or geothermal heat. In particular, solar cells that produce electrical energy using sunlight are easy to install in each home or factory, and are suitable for application to an energy storage system distributed in each home. Distributed power sources can configure a large-capacity energy system by providing a plurality of power generation modules in parallel to produce power for each power generation module.

The system includes power plants, substations, transmission lines, and the like. When the grid is in a normal state, it supplies power to an energy storage system or a feeder and receives the power supplied from the energy storage system. When the grid is in an abnormal state, power supply from the grid to the energy storage system or the feeder is stopped, and power supply from the energy storage system to the grid is also stopped.

A feeder is a subject that consumes power generated from a distributed power source, power stored in a battery, or power supplied from a grid, and may be, for example, a home or a factory.

In the following embodiments, for convenience of description, photovoltaic power generation will be described as an example of a distributed power source.

1 is a diagram for explaining a photovoltaic power generation system according to an embodiment, FIG. 2 is a diagram for explaining a power distribution system including distributed power sources according to an embodiment, and FIG. 3 is a diagram for distributed power sources according to an embodiment. It is a configuration block diagram of an optimum voltage control device, and FIG. 8 is a configuration block diagram of a control device according to an embodiment. Referring to FIGS. 1 to 3 , the photovoltaic module array 100 is composed of a plurality of solar cell modules to output DC current and provide it to the connecting board 200 . In the photovoltaic module array 100, a plurality of solar cell modules that convert solar energy into electrical energy and output them are connected in series, and a plurality of photovoltaic module arrays may be connected to one connection panel. In this case, the voltage information and the current information may include a time stamp meaning measurement time information.

A plurality of photovoltaic module arrays 100 may be connected in parallel to the connecting board 200 . The connection panel 200 connects the solar module array 100 and the inverter 200 to collect direct current power generated from the solar module array 100 by connecting them in series/parallel. A diode for prevention may be installed. A plurality of connecting panels may be connected to one inverter.

The inverter 300 may convert the generated power provided in the form of direct current from the connection board 200 into alternating current and supply it to a load terminal (not shown). The inverter 300 is installed inside the electric room, and each inverter 300 is connected to a plurality of connecting panels 200 with a cable to receive DC power. In addition, the inverter 300 can measure information on the amount of photovoltaic power generation generated from the connection board 200 and the photovoltaic module array 100 connected thereto, and power generation information (voltage, current, active/reactive power, power generation, status information, etc.) can be transmitted to the control device.

Inverters and weather observation equipment belonging to each group may perform data communication with the control device through their own communication module. Alternatively, since a separate communication module is disposed in each group, data received from inverters and weather observation equipment belonging to each group may be transmitted to the control device.

8 is a configuration block diagram of a control device according to an embodiment.

Referring to FIG. 8 , the control device according to the embodiment may include a measurement unit 410 , a calculation unit 420 , a determination unit 430 and a communication unit 440 .

The measurement unit 410 may collect voltage, current, frequency, phase, and active power information of the low voltage or high voltage side linked to the distributed power supply.

The control device can not only receive generation information from the inverter through communication, but also measure real-time power information (voltage, current, active/reactive power, generation amount, etc.) and cut-off, power quality monitoring, and voltage control for voltage fluctuations of connection points. The control device can transmit the acquired data to the upper system, and through monitoring and control in connection with the upper system, stable distribution line operation and power quality maintenance of the distribution system and distributed power source are possible. In an embodiment, the upper system 500 may include a distributed power supply optimum voltage control system.

In addition, the control device according to the embodiment monitors the electrical quality (PQM) of the distributed power source in real time and controls the opening/closing unit (not shown) to block the protection device or stop the operation of the inverter 300 when it is out of the specified range. By shutting down, the system can be operated stably.

In addition, the control device according to the embodiment may perform power factor control when the distributed power connection point deviates from the specified voltage range.

In addition, the control device according to the embodiment may block the fault by shutting off the switch or stopping the inverter 300 when a fault current is detected at the distributed power supply connection point.

In addition, the control device according to the embodiment may control the output of the inverter when the system is out of the specified frequency range.

The control device may measure the magnitude and phase of the 3-phase voltage value through the PT sensor and measure the magnitude and phase of the 3-phase current value through the CT sensor.

In addition, it is possible to calculate inactive power based on current and voltage measurement values, detect voltage and current harmonics, and receive operation information of the inverter.

The calculation unit 420 may calculate the cumulative power generation amount, power quality (harmonics, sag, swell, interruption, etc.), voltage/current unbalance rate, and the like, based on the data received from the measurement unit 410 .

The determination unit 430 may transmit (Unsol) spontaneous event alarm information from the control device 400 to the upper system when the distributed current power connection point is out of the specified voltage range (voltage upper limit value & lower limit value). At this time, the specified voltage range should be input to the control device 400 as a set value.

The control device may perform wired/wireless communication with the distributed power supply optimum voltage control device and the inverter through the communication unit 440 .

Distributed power supply optimum voltage control device 500 according to an embodiment includes a communication unit 510, a data processing unit 520, a first processing unit 530, a second processing unit 540, a third processing unit 550 and a database It may be configured to include (560).

The distributed power supply optimum voltage control device 500 according to the embodiment is a device applied to distributed power connected to a power distribution system. As a device for monitoring and controlling the inverter of distributed power to solve the voltage problem caused by distributed power output from the perspective of the distribution grid operator, it can be installed at the connection point where the distribution system and distributed power are connected.

The communication unit 510 may receive a connection point voltage value from a control device installed on the distribution line (D/L). The linkage point voltage value may consist of an RMS value. Also, the communication unit 510 may transmit the control amount calculated by the third processing unit 550 to the control device.

In addition, the communication unit 510 may receive, from the control device 400, the magnitude and phase of the three-phase voltage value, the magnitude and phase of the three-phase current value, the inactive power, the harmonics of the voltage and current, and the operation information of the inverter. .

The communication unit 510 is, for example, wireless LAN (WLAN), Wi-Fi, Wi-Bro (WirelESS Broadband: Wibro), WiMAX (World Interoperability for Microwave Access: Wimax), HSDPA (High Speed Downlink) Packet Access), IEEE 802.16, Long Term Evolution (LTE), and broadband wireless mobile communication service (WirelESS(12) Mobile Broadband Service: WMBS). there is. Alternatively, the communication unit 510 may include Bluetooth, Radio Frequency Identification (RFID), Infrared Data Association (IrDA), Ultra Wideband (UWB), Zigbee, Near Field Communication (NFC), and the like. In addition, as wired communication technology, data communication with the control device 400 may be performed using a communication technology such as USB communication, Ethernet, serial communication, optical/coaxial cable, or the like.

The data processing unit 520 may generate a voltage profile by arranging the connection point voltage values according to the order in which the control device 400 is disposed on the distribution line.

The data processing unit 520 may generate a voltage profile by arranging the received connection point voltage values according to the order in which the control device 400 is arranged in the direction of the end of the line starting from the substation.

The data processing unit 520 may list the plurality of connection point voltage values received from the communication unit 510 in order of arrangement, starting with the substation. For example, the data processing unit 520 sets the connection point voltage value received from the control device 400 located closest to the substation as No. 1, and assigns a subordinate number to the control device 400 located in the direction of the end of the line A voltage profile can be created in such a way.

The first processing unit 530 may process that an abnormal state has occurred when at least one of the linkage point voltage values is out of a preset linkage point reference voltage range. The reference voltage range is a preset parameter and may include an upper voltage limit value and a lower voltage limit value. The reference voltage range can be determined according to the criteria specified in Article 15 (electricity quality) of the ‘Distributed Power Distribution System Connection Technical Standards’.

The first processor 530 may process that an abnormal state has occurred when at least one of the linkage point voltage values included in the voltage profile is greater than the upper voltage limit value or less than the lower voltage limit value.

In addition, the first processing unit 530 may determine whether an abnormal state has occurred by using the connection point voltage value received after transmission of the power factor value. The first processing unit 530 controls the inverter 300 using the control amount calculated by the control device 400 through the third processing unit 550, and then uses the received connection point voltage value again to detect an abnormal state. can judge That is, the first processing unit 530 may determine whether all connection point voltages included in the voltage profile are included in the reference voltage range after the control of the inverter 300 is performed.

In an embodiment, whether or not an abnormal state has occurred may be received from the control device 400 . In this case, the first processing unit 530 may be omitted from the distributed power supply optimum voltage control device 500 .

When an abnormal state occurs, the second processing unit 540 may search for the lowest linkage point voltage value in the voltage profile and select a control device having a lower priority than the lowest linkage point voltage value as a control target. When an abnormal state occurs, the second processing unit 540 may first search for the lowest linkage point voltage value among the linkage point voltage values included in the voltage profile. The second processing unit 540 may select the control device 400, which has a lower priority based on the lowest link point voltage value, as a control target. In the embodiment, the subordinated order may refer to all control devices 400 that are relatively farther from the control device 400 that has transmitted the lowest connection point voltage value to the substation side.

That is, the second processing unit 540 may select all control devices 400 disposed in the direction of the end of the line as control targets based on the control device 400 having the lowest connection point voltage value measured.

Also, when the abnormal state reoccurs, the second processing unit 540 may search for the lowest linkage point voltage value in the voltage profile and select the control device 400 having a lower priority than the lowest linkage point voltage value as a control target. The second processing unit 540 controls the inverter 300 using the control amount calculated by the control device 400 through the third processing unit 550 and then, when the abnormal state reoccurs, the lowest linkage point voltage in the voltage profile. The value may be searched again, and the control device 400 having a lower priority than the lowest link point voltage value may be selected as a control target. At this time, the lowest connection point voltage value and the control device to be controlled may be different from before.

The third processing unit 550 may calculate the control amount of the control device 400 selected as the control target and transmit the calculated control amount through the communication unit 510 . At this time, the third processing unit 550 may transmit the power factor value through the communication unit 510 after calculating the power factor value for each of the control devices 400 as control targets.

At this time, the third processing unit 550 may equally calculate all power factor values of the control device 400 to be controlled or may differently calculate the power factor value for each control device 400 . For example, the third processing unit 550 may calculate and transmit one power factor value so that the same power factor value is applied to all control devices 400 as control targets. Alternatively, the third processing unit 550 may calculate and transmit power factor values differently according to the order of the voltage profile. For example, when at least one of the linkage point voltage values included in the voltage profile exceeds the voltage upper limit value, the third processing unit 550 may calculate a smaller power factor value as the order of the voltage profile is lower. there is. Alternatively, the third processing unit 550 may calculate a larger power factor value as the order of the voltage profile is lower in order when at least one of the linkage point voltage values included in the voltage profile is less than the lower voltage limit.

The third processing unit 550 may calculate a power factor value for stabilizing the voltage. For example, when at least one linkage point voltage value among the linkage point voltage values included in the voltage profile exceeds an upper voltage limit, the third processing unit 550 may calculate and transmit a lagging power factor command to the control device. Alternatively, when at least one of the linkage point voltage values included in the voltage profile is less than the lower voltage limit, the third processing unit 550 may calculate and transmit a leading power factor command to the control device.

In addition, the third processing unit 550 may retransmit the adjusted power factor value through the communication unit 510 after adjusting the previously transmitted power factor value. The third processing unit 550 may recalculate the power factor value when the abnormal state reoccurs. At this time, the third processing unit 550 may recalculate the power factor value by adjusting the previously transmitted power factor value. For example, if the abnormal state persists, the third processing unit 550 adjusts the power factor value step by step from -0.98 → -0.96 → -0.94 → -0.92 → -0.90 to control the control device through the communication unit 510 ( 400).

The database 560 is a flash memory type, a hard disk type, a multimedia card micro type, a card type memory (eg SD or XD memory, etc.) ), magnetic memory, magnetic disk, optical disk, RAM (Random Access Memory: RAM), SRAM (Static Random Access Memory), ROM (Read-Only Memory: ROM), EEPROM (Electrically Erasable Programmable Read-Only Memory), PROM ( Programmable Read-Only Memory) may include at least one storage medium. Also, the apparatus 500 for controlling a distributed power supply optimum voltage may operate a web storage that performs a database storage function on the Internet or may operate in relation to the web storage.

In addition, the database 560 may store data and programs necessary for the distributed power supply optimum voltage control apparatus 500 to operate.

In addition, the database 560 may store various user interfaces (UIs) or graphic user interfaces (GUIs).

4 to 6 are diagrams for explaining the operation of the distributed power supply optimum voltage control device according to the embodiment.

Referring to FIG. 4 , the data processing unit may arrange a plurality of connection point voltage values received from the communication unit in the order of arrangement, starting with the substation. The data processing unit may generate a voltage profile in such a way that the connection point voltage value received from the control device located closest to the substation is set to No. 1 and the control device located in the direction of the end of the line is given a lower priority number. In the graph of FIG. 4, the Y-axis is the measured connection point voltage value [RMS], and the X-axis may mean the distance of the corresponding control device from the substation. Each circle number 1 to 10 may mean a rank or order on the voltage profile.

The first processing unit may process that an abnormal state has occurred when at least one of the linkage point voltage values included in the voltage profile is greater than the upper voltage limit value or less than the lower voltage limit value. Since the voltage values of the connection points of the eighth to tenth control devices exceed the upper voltage limit value, the first processing unit may process that an abnormal state has occurred.

The second processing unit may search for the lowest linkage point voltage value in the voltage profile, and select a control device having a lower priority than the lowest linkage point voltage value as a control target. The second processing unit may search the voltage value of the fifth control device as the lowest connection point voltage value, and select sixth to tenth control devices that are subordinate to the fifth control device as control targets.

The third processing unit may calculate the control amount of the control device selected as the control target. The third processing unit may calculate power factor values for the sixth to tenth control devices to be controlled. For example, the third processing unit may calculate one terrestrial power factor value so that the same power factor value is applied to all of them, and transmit it to the sixth to tenth control devices through the communication unit.

Alternatively, the third processing unit may differently calculate and transmit the power factor value according to the order of the voltage profile. For example, the third processing unit may calculate and transmit a differentially smaller power factor value for a control device having a lower priority than the sixth control device.

7 is a flowchart of a distributed power supply optimum voltage control method according to an embodiment.

Referring to FIG. 7 , the communication unit first receives a connection point voltage value from a control device installed in a distribution line (S701).

Next, the data processor generates a voltage profile by arranging the connection point voltage values according to the order in which the control devices are disposed on the distribution line (S702).

Next, the first processing unit processes that an abnormal state has occurred when at least one of the linkage point voltage values is out of the preset linkage point reference voltage range (S703 to 704).

Next, when the abnormal state occurs, the second processing unit searches for the lowest linkage point voltage value in the voltage profile (S705).

Next, the second processing unit selects, as a control target, a control device having a lower priority than the lowest linkage point voltage value (S706).

Next, the third processing unit calculates the control amount of the control device selected as the control target (S707).

Next, the calculated control amount is transmitted to the control device to be controlled through the communication unit (S708).

Next, the communication unit receives the connection point voltage value again from the control device installed in the distribution line (S701).

Next, the data processor generates a voltage profile by arranging the connection point voltage values according to the order in which the control devices are disposed on the distribution line (S702).

Next, the first processing unit processes that an abnormal state has occurred when at least one of the linkage point voltage values is out of the preset linkage point reference voltage range (S703 to 704).

When an abnormal state occurs, the second processing unit, the third processing unit, and the communication unit repeat steps S705 to S708 previously performed.

Alternatively, when the abnormal state does not occur, the process returns to step S701.

Distributed power supply optimum voltage control apparatus and method according to the embodiment implements cooperative control (distributed power supply whose connection point voltage does not exceed control participation) based on the voltage profile of the entire distribution line, not the connection point of the distributed power supply. In this case, the control effect can be maximized, and the concentration of distributed power supply control frequency at the end of the line can be alleviated in a geopolitical sense.

The method according to the embodiment may be implemented in the form of program instructions that can be executed through various computer means and recorded on a computer readable recording medium. In this case, the medium may continuously store a program executable by a computer or temporarily store the program for execution or download. In addition, the medium may be various recording means or storage means in the form of a single or combined hardware, but is not limited to a medium directly connected to a certain computer system, and may be distributed on a network. Examples of the medium include magnetic media such as hard disks, floppy disks and magnetic tapes, optical recording media such as CD-ROM and DVD, magneto-optical media such as floptical disks, and ROM, RAM, flash memory, etc. configured to store program instructions. In addition, examples of other media include “recording media” or storage media managed by an app store that distributes applications, a site that supplies or distributes other various software, and a server.

The term '~unit' used in this embodiment means software or a hardware component such as a field-programmable gate array (FPGA) or ASIC, and '~unit' performs certain roles. However, '~ part' is not limited to software or hardware. '~bu' may be configured to be in an addressable storage medium and may be configured to reproduce one or more processors. Therefore, as an example, '~unit' refers to components such as software components, object-oriented software components, class components, and task components, processes, functions, properties, and procedures. , subroutines, segments of program code, drivers, firmware, microcode, circuitry, data, databases, data structures, tables, arrays, and variables. Functions provided within components and '~units' may be combined into smaller numbers of components and '~units' or further separated into additional components and '~units'. In addition, components and '~units' may be implemented to play one or more CPUs in a device or a secure multimedia card.

Although the above has been described with reference to preferred embodiments of the present invention, those skilled in the art will variously modify and change the present invention within the scope not departing from the spirit and scope of the present invention described in the claims below. You will understand that it can be done.

500: decentralized power supply optimum voltage control unit
510: communication department
520: data processing unit
530: first processing unit
540: second processing unit
550: third processing unit
560: database

Claims (13)

a communication unit for receiving a linkage point voltage value from a control device installed on a distribution line (D/L);
a data processing unit for generating a voltage profile by arranging connection point voltage values according to the order in which the control device is disposed on the distribution line;
a first processing unit for processing that an abnormal state has occurred when at least one of the linkage point voltage values is out of a preset linkage point reference voltage range;
a second processing unit for searching for a lowest linkage point voltage value in the voltage profile and selecting a control device having a lower priority than the lowest linkage point voltage value as a control target when the abnormal state occurs; and
and a third processing unit for calculating a control amount of the control device selected as the control target and then transmitting the calculated control amount through the communication unit.
According to claim 1,
The data processing unit generates the voltage profile by arranging the received connection point voltage values according to the order in which the control devices are arranged in the direction of the line end from the substation as a starting point.
According to claim 1,
The second processing unit selects all control devices disposed in the direction of the end of the line as the control target based on the control device for which the lowest linkage point voltage value is measured.
According to claim 1,
The third processing unit calculates a power factor value for each of the control devices to be controlled, and then transmits the power factor value through the communication unit.
According to claim 4,
Wherein the first processing unit determines whether or not an abnormal state has occurred by using the connection point voltage value received after the transmission of the power factor value.
According to claim 5,
When the abnormal state reoccurs, the second processing unit searches for the lowest linkage point voltage value in the voltage profile, selects a control device subordinate to the lowest linkage point voltage value as a control target,
The third processing unit adjusts the previously transmitted power factor value and then retransmits the adjusted power factor value through the communication unit.
receiving, by a communication unit, a linkage point voltage value from a control device installed in a distribution line (D/L);
generating a voltage profile by a data processing unit by arranging connection point voltage values according to the order in which the control device is disposed on the distribution line;
processing, by a first processing unit, that an abnormal state has occurred when at least one of the linkage point voltage values is out of a predetermined linkage point reference voltage range;
retrieving, by a second processing unit, a lowest linkage point voltage value from the voltage profile when the abnormal state occurs;
selecting, by the second processing unit, a control device having a lower priority than the lowest linkage point voltage value as a control target;
calculating a control amount of the control device selected as the control target by a third processing unit; and
Distributed power supply optimum voltage control method comprising the step of transmitting the calculated control amount through the communication unit.
According to claim 7,
Generating the voltage profile,
and generating the voltage profile by arranging the received connection point voltage values according to the order in which the control devices are disposed in a line end direction from the substation as a starting point.
According to claim 7,
The step of selecting as the control target,
Distributed power supply optimum voltage control method of selecting all control devices arranged in the direction of the end of the line as the control target based on the control device for which the lowest linkage point voltage value is measured.
According to claim 7,
In the step of transmitting the calculated control amount,
Distributed power supply optimum voltage control method comprising the step of calculating a power factor value for each control device to be controlled.
According to claim 10,
performing inverter control using the power factor value received by the control device;
transmitting the connection point voltage value measured by the control device to the communication unit;
receiving, by a communication unit, a linkage point voltage value from a control device installed in a distribution line (D/L); and
and determining, by the first processing unit, whether or not an abnormal state has occurred by using an associated point voltage value received after transmitting the power factor value.
According to claim 11,
searching for the lowest linkage point voltage value in the voltage profile when the abnormal state reoccurs;
selecting, by the second processing unit, a control device having a lower priority than the lowest linkage point voltage value as a control target;
Adjusting the power factor value previously transmitted by the third processing unit: and
The distributed power supply optimum voltage control method further comprising retransmitting the adjusted power factor value through the communication unit.
A computer-readable 　recording medium in which a program for executing the method of any one of claims 7 to 12 is recorded on a computer.

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