JP7363367B2 - Power distribution control equipment and systems - Google Patents

Description

The present invention relates to a power distribution control device and system.

BACKGROUND ART Power distribution automation systems are conventionally known (for example, see Patent Document 1). The power distribution automation system includes a power distribution control device, also called a power distribution automation server. The power distribution control device controls switches that connect different power distribution lines.
[Prior art documents]
[Patent document]
[Patent Document 1] Japanese Unexamined Patent Publication No. 2019-115182

In power transmission equipment such as power transmission lines, the upper limit of the power that can be transmitted is determined as the power transmission capacity due to the allowable current and the like. In order to cope with the increase in distributed power sources electrically connected to power transmission equipment, it is desirable to increase the utilization rate, which is the ratio of transmitted power to power transmission capacity.

In a first aspect of the present invention, a power distribution control device is provided. The power distribution control device may include a congestion degree acquisition unit. The congestion degree acquisition unit may acquire information regarding the congestion degree of each of the plurality of power transmission lines. The power distribution control device may include a control section. The control unit may control at least one switch based on the degree of congestion to switch the power transmission line to which the distributed power source is electrically connected. The switch may be capable of electrically connecting the distributed power source to any of the plurality of power transmission lines via transformer equipment.

The congestion degree acquisition unit may acquire information regarding the congestion degree of the first power transmission line and information regarding the congestion degree of the second power transmission line. The control unit is configured to cause at least some of the one or more distributed power sources electrically connected to the first power transmission line to operate in the first power transmission line when the degree of congestion of the first power transmission line is higher than the degree of congestion of the second power transmission line. The switch may be controlled so that it is electrically connected to the two power transmission lines.

The congestion degree acquisition unit may acquire information regarding the congestion degree of the first power transmission line and information regarding the congestion degree of the second power transmission line. The control unit is configured to supply electricity to the first power transmission line when the congestion degree of the first power transmission line is higher than the congestion degree of the second power transmission line, and the congestion degree of the first power transmission line is higher than a predetermined first threshold value. The switch may be controlled such that at least some of the one or more distributed power sources connected to the second power transmission line are electrically connected to the second power transmission line.

The control unit connects one or more distributed power sources electrically connected to the first power transmission line to the second power transmission line based on the congestion degree of the first power transmission line and the congestion degree of the second power transmission line. The number or types of distributed power sources that are switched to be electrically connected may be determined.

A first power distribution system may be electrically connected to the first power transmission line via a first transformer equipment. A second power distribution system may be electrically connected to the second power transmission line via a second voltage transformation facility. The distributed power source may include a distributed power source whose connection is to be switched. The distributed power source to be connected can be connected to the first distribution system via at least one first switch, and can also be connected to the second distribution system via at least one second switch. It may be. The control unit is configured to switch the connection switching target distributed type when the congestion degree of the first power transmission line is higher than the congestion degree of the second power transmission line, and the congestion degree of the first power transmission line is higher than a predetermined first threshold value. switching off at least one of the first switches to electrically disconnect at least a portion of the power source from the first electrical distribution system, and a second switch to electrically connect the power to the second electrical distribution system; You can switch it on.

After switching off at least one of the first switches and switching on the second switch, the control unit controls the congestion degree of the first power transmission line to a predetermined value equal to or less than the first threshold value. When it becomes below the threshold value, the first switch may be turned back on, and at least one of the second switches may be turned off.

The first power distribution system may include one or more first power distribution lines electrically connected to the first transformer equipment. The second power distribution system may include one or more second power distribution lines electrically connected to the second transformer equipment. The power distribution control device may further include a calculation unit. The calculation unit may calculate the load in the plurality of sections in the first distribution line and the generated power of the distributed power source based on the electrical measurement results at the plurality of points in the first distribution line. The calculation unit may calculate the load and the generated power of the distributed power source in the plurality of sections in the second distribution line based on the electrical measurement results at the plurality of points in the second distribution line. The calculation unit calculates a plurality of sections within the first distribution line and a plurality of sections within the second distribution line in a state where at least one of the first switches is switched off and the second switch is switched on. The load and the power generated by the distributed power source may be calculated.

The power distribution control device may further include a control information acquisition unit. The control information acquisition unit may acquire control information used to limit the output of the distributed power sources connected to each first distribution line or each second distribution line. The calculation unit may calculate the load and the generated power of the distributed power source in the plurality of sections within each first distribution line and the plurality of sections within each second distribution line, based on the control information and the electrical measurement results.

The degree of congestion of a power transmission line includes the ratio of actual tidal power to the power transmission capacity, which indicates the power that the transmission line can transmit, or power generation suppression information that causes distributed power sources connected to the transmission line to suppress the generated power. That's fine.

In a second aspect of the invention, a system is provided. The system may include any one power distribution controller described above. The system may include a terminal device communicably connected to the power distribution control device.

In a third aspect of the present invention, a power distribution control device is provided. The wiring control device may include a control information acquisition section. The control information acquisition unit may acquire control information used to limit the output of the distributed power source. The distributed power source may be connected to at least one distribution line. The power distribution line may be connected to the power transmission line via transformer equipment. The wiring control device may include a measurement result acquisition section. The measurement result acquisition unit may acquire electrical measurement results at multiple points within the power distribution line. The wiring control device may include a calculation unit. The calculation unit may calculate the load in multiple sections within the distribution line and the power generated by the distributed power source based on the control information and the electrical measurement results.

The control information may include power transmission line failure information.

The control information may include power generation suppression information that causes the distributed power source to suppress generated power.

The measurement result acquisition unit may acquire measurement results of current, voltage, and power factor at multiple points within the distribution line. The calculation unit calculates the load and load in multiple sections within the distribution line based on the measurement results of current, voltage, and power factor within the area of the distribution line and the status of the distributed power source on the distribution line obtained from the control information. The power generated by the distributed power source may be calculated.

The one or more distribution lines may include one distribution line and another distribution line. The measurement result acquisition unit may acquire electrical measurement results at multiple points within one power distribution line and at multiple points within another power distribution line. The calculation unit may calculate loads and generated power of the distributed power source in multiple sections within one distribution line and multiple sections within another distribution line based on the control information and the electrical measurement results. The power distribution control device may determine whether or not one power distribution line can be connected to another power distribution line based on the load calculated by the calculation unit and the generated power of the distributed power source.

The calculation unit may calculate the load and the generated power of the distributed power source in multiple sections within one distribution line and multiple sections within another distribution line when a failure occurs in one distribution line. The determination unit may determine whether connection is possible between one distribution line and another distribution line when a failure occurs in one distribution line.

The computer may further include a storage unit that stores the calculation results calculated by the calculation unit. The calculation unit calculates the loads and the generated power of the distributed power source in multiple sections of one distribution line and multiple sections of other distribution lines, regardless of whether a failure has occurred in one distribution line. good. The determination unit determines whether connection is possible between the first distribution line and the other distribution line based on the calculation result stored in the storage unit when a failure occurs in the first distribution line. good.

The control information may include power transmission line failure information. Based on the failure information of the power transmission line, another power distribution line to which one power distribution line is connected may be selected from among the plurality of power distribution lines.

The control information acquisition unit may acquire control information from a command device that transmits control commands to the distributed power sources through a communication line.

In a fourth aspect of the invention, a system is provided. The system may include any one power distribution controller described above. The system may include a terminal device communicably connected to the power distribution control device.

Note that the above summary of the invention does not list all the necessary features of the invention. Furthermore, subcombinations of these features may also constitute inventions.

FIG. 1 is a diagram illustrating an example of an outline of a power system. It is a figure showing an example of control contents of a power distribution control device in a 1st embodiment. FIG. 1 is a block diagram showing an example of a schematic configuration of a power distribution control device in a first embodiment. It is a figure which shows an example of the process of switching the connection relationship of distributed power supplies in 1st Embodiment. It is a figure which shows an example of the process of switching the connection relationship of distributed power supplies in 1st Embodiment. 3 is a flowchart illustrating an example of processing of the power distribution control device. It is a flow chart which shows an example of control processing of a switch by a power distribution control device. 12 is a flowchart illustrating an example of a process of restoring the connection relationship of distributed power sources to the original state by the power distribution control device. FIG. 7 is a diagram illustrating an example of control contents of the power distribution control device in a modification of the first embodiment. It is a block diagram showing an example of a schematic structure of a power distribution control device in a modification of a 1st embodiment. It is a flowchart which shows an example of connection processing between a plurality of distribution lines in a modification of a 1st embodiment. It is a flow chart which shows another example of connection processing between a plurality of distribution lines in a modification of a 1st embodiment. It is a flowchart which shows an example of the calculation process of the generated electric power and load in the modification of 1st Embodiment. It is a flowchart which shows an example of the process which selects the other distribution line to which one distribution line is connected in the modification of 1st Embodiment. It is a figure which shows an example of the process of selecting another power distribution line to which one power distribution line is connected in the modification of 1st Embodiment. FIG. 7 is a diagram illustrating an example of control contents of a power distribution control device in a second embodiment. FIG. 3 is a diagram illustrating an example of the processing content of N-1 electricity control. FIG. 2 is a block diagram illustrating an example of a schematic configuration of a power distribution control device in a second embodiment. This is an example of generated power and load before power limitation. This is an example of generated power and load after power limitation. It is a figure which shows an example of the control content of the power distribution control apparatus in a comparative example. It is a flow chart which shows an example of processing of a power distribution control device in a 2nd embodiment. It is a flowchart which shows an example of the process which connects between several power distribution lines in 2nd Embodiment. It is a flowchart which shows another example of the process of connecting between several power distribution lines in 2nd Embodiment. It is a flowchart which shows an example of the process which selects another distribution line to which one distribution line is connected in 2nd Embodiment. It is a figure which shows an example of the process of selecting another power distribution line to which one power distribution line is connected in 2nd Embodiment. It is a figure showing an example of control contents of a power distribution control device in a modification of a 2nd embodiment. It is a figure which shows an example of the content of power generation suppression. This is an example of generated power and load after power generation is suppressed. It is a flow chart which shows an example of processing of a power distribution control device in a modification of a 2nd embodiment.

Hereinafter, the present invention will be described through embodiments of the invention, but the following embodiments do not limit the invention according to the claims. Furthermore, not all combinations of features described in the embodiments are essential to the solution of the invention.

[First embodiment]

FIG. 1 is a diagram schematically showing an example of an electric power system. In one example, power system 400 includes a trunk power transmission system 402. Various power generation facilities such as a thermal power plant 412 , a hydropower plant 413 , a pumped storage power plant 414 , and a PPS (specified scale electric utility) power supply 415 may be electrically connected to the main power transmission system 402 . The power generation equipment connected to the main power transmission system 402 is not limited to that shown in FIG. 1 . The trunk power transmission system 402 may be connected to an interconnection line 403 for interconnecting with other trunk power transmission systems.

A plurality of power transmission lines 10 and 20 may be electrically connected to the main power transmission system 402. The plurality of power transmission lines 10 and 20 are also referred to as a power transmission system. Various power generation facilities such as a pumped storage power plant 424, a solar power generation facility 426, and a wind power generation facility 428 may be electrically connected to the power transmission line 10.

A first power distribution system 13 is electrically connected to the power transmission line 10 via a first transformer equipment 12 . The first transformer equipment 12 is, for example, a power distribution substation. A distributed power source 30 and a load may be electrically connected to the first power distribution system 13 . Distributed power source 30 is, for example, solar power generation equipment or wind power generation equipment. Similarly to the power transmission line 10, the power transmission line 20 is connected to a power distribution system, and a distributed power source may be electrically connected to the power distribution system.

In this example, a central power supply command device 502 controls various power generation facilities connected to the main power transmission system 402. The command device 500 receives control commands from the central power supply command device 502. The command device 500 is also called a system control center or a system control device. The command device 500 transmits control commands to various power generation facilities connected to the power transmission line 10, such as a pumped storage power plant 424, a solar power generation facility 426, and a wind power generation facility 428. The command device 500 may control various power generation facilities within the plurality of power transmission lines 10 and 20. Further, the command device 500 may transmit a control command to the plurality of distributed power sources 30 connected to the first power distribution system 13 to control them.

The power distribution automation system 1 controls a plurality of switches provided in the first power distribution system 13 and other power distribution systems. The switch will be described later. In one example, when a power outage occurs, the power distribution automation system 1 localizes the power outage area to shorten the power outage time. The power distribution automation system 1 may maintain and manage equipment for stable supply of electricity. Furthermore, the power distribution automation system 1 may ensure safety at the site. Note that the power distribution automation system 1 may be any system that remotely controls switches, and may be called by other names such as a monitoring system or a control system.

The power distribution automation system 1 of this embodiment may acquire control information transmitted to each power generation facility from the command device 500, which is a host system. The power distribution automation system 1 may acquire information on the congestion degree of power transmission in each power transmission line 10 and 20 from the command device 500. The power distribution automation system 1 uses various information acquired from the command device 500 to control switches in the power distribution system.

FIG. 2 is a diagram illustrating an example of control contents of the power distribution control device 100 in the first embodiment. The power distribution automation system 1 includes a power distribution control device 100 and a terminal device 101. The power distribution control device 100 is also called a power distribution automation server. The terminal device 101 is also called a client terminal. The power distribution automation system 1 may include a plurality of terminal devices 101. Power distribution control device 100 and terminal device 101 are communicably connected via a communication line.

The power distribution control device 100 is installed, for example, in a general office of an electric power company, and the terminal device 101 is installed, for example, in each office. In this specification, the power distribution control device 100 may be any device that remotely controls a switch in a power distribution system, and may be a device called a monitoring device, a control device, a monitoring server, a control server, or other name. It's good.

The power distribution control device 100 acquires information regarding the degree of congestion of each of the plurality of power transmission lines 10 and 20 (hereinafter referred to as congestion information) from the command device 500. Then, the power distribution control device 100 controls the switches 32-1 to 32-4 based on the congestion degree of each of the plurality of power transmission lines including the power transmission line 10 which is the first power transmission line and the power transmission line 20 which is the second power transmission line. (sometimes collectively referred to as the switch 32). The switches 32-1 to 32-4 switch the connection destinations to which the distributed power sources 30-1 and 30-2 are electrically connected between the power transmission line 10 and the power transmission line 20.

In FIG. 2, the power transmission line 10 is provided with a measuring device 11. The measuring device 11 performs electrical measurement to calculate the degree of congestion of the power transmission line 10 . A measuring device 21 is provided on the power transmission line 20 . The measuring device 21 performs electrical measurement to calculate the degree of congestion of the power transmission line 20 . The measuring instruments 11 and 21 are, for example, power meters. The measurement results by the measuring instruments 11 and 21 are acquired by the command device 500 as congestion information.

In this embodiment, the congestion degree of the power transmission line is the ratio (utilization rate) of actual power flow to the power transmission capacity indicating the power that can be transmitted by each power transmission line 10, 20, or is associated with the ratio (utilization rate). It can be information. In one example, the congestion level of the power transmission line causes the distributed power sources 30-1 to 30-4 (sometimes collectively referred to as the distributed power sources 30) connected to the power transmission lines 10 and 20 to suppress the generated power. The information may also be information regarding a power generation suppression command. A higher degree of power generation suppression corresponds to a higher degree of congestion on power transmission lines.

The command device 500 may transmit a power generation suppression command to the distributed power sources 30-1 to 30-4 to suppress the generated power based on the congestion degree of the power transmission line. The power generation suppression information may be information on this power generation suppression command. The degree of congestion may be an actual congestion situation or future congestion prediction information.

A first power distribution system 13 is electrically connected to the power transmission line 10 via a first transformer equipment 12 . The first power distribution system 13 includes a plurality of power distribution lines 16-1 to 16-3. The power distribution lines 16-1 to 16-3 are each electrically connected to the power transmission line 10 via the first transformer equipment 12. Feeder circuit breakers (FCB) 14-1 to 14-3 are provided between the distribution lines 16-1 to 16-3 and the first transformer equipment 12, respectively. The feeder circuit breakers 14-1 to 14-3 electrically disconnect the respective power distribution lines 16-1 to 16-3 from the power transmission line 10 upon receiving a command from the power distribution control device 100 or the like.

A second power distribution system 23 is electrically connected to the power transmission line 20 via a second voltage transformation facility 22 . The second power distribution system 23 includes a plurality of power distribution lines 26-1 to 26-3. The power distribution lines 26-1 to 26-3 are electrically connected to the power transmission line 20 via the second transformer equipment 22, respectively. Between the distribution lines 26-1 to 26-3 and the second transformer equipment 22, feeder circuit breakers (FCB) 24-1 to 24-3 are provided. The feeder circuit breakers (FCB) 24-1 to 24-3 electrically disconnect the respective power distribution lines 26-1 to 26-3 from the power transmission line 20 upon receiving a command from the power distribution control device 100 or the like.

The plurality of distributed power sources 30-1 to 30-4 include distributed power sources 30-1 and 30-2 that are subject to connection switching. The distributed power source 30-1 is connectable to the first distribution system 13 via at least one switch 32-1, and is also connected to the second distribution system 23 via at least one switch 32-2. It is possible. Similarly, the distributed power source 30-2 can be connected to the first distribution system 13 via at least one switch 32-3, and can be connected to the second distribution system 23 via at least one switch 32-4. It is also possible to connect to

The switch 32-1 and the switch 32-3 are each an example of a first switch. The switch 32-2 and the switch 32-4 are each an example of a second switch. Note that, unlike this example, the first switch and the second switch may each be configured by connecting a plurality of switches in series.

FIG. 3 is a block diagram showing an example of a schematic configuration of the power distribution control device 100 in the first embodiment. A schematic configuration of the power distribution control device 100 will be described with reference to FIGS. 2 and 3. The power distribution control device 100 includes a congestion degree acquisition section 102 and a control section 104. The congestion degree acquisition unit 102 and the control unit 104 may be realized as a function of a CPU (central processing unit).

The congestion degree acquisition unit 102 acquires congestion information for each of the power transmission line 10 and the power transmission line 20. The control unit 104 includes at least one switch 32-1 to 32-4 that can electrically connect the distributed power sources 30-1 and 30-2 to either the power transmission line 10 or the power transmission line 20 via a transformer equipment. control based on the degree of congestion. In this example, the control unit 104 controls the controlled distributed power sources 30-1 and 30-2 by controlling the switches 32-1 to 32-4 to turn on (closed) or off (open) based on the degree of congestion. Switch the power line to which it is electrically connected.

In FIG. 2, when the congestion degree of the power transmission line 10 is higher than the congestion degree of the power transmission line 10 and the congestion degree of the power transmission line 10 is higher than a predetermined first threshold value, the control unit 104 controls the power transmission line 10 The switch 32 is configured such that at least some of the one or more distributed power sources 30-1, 30-2, and 30-3 electrically connected to the other power transmission line 20 are electrically connected to the other power transmission line 20. -1 to 32-4 are controlled. The first threshold value is set in advance and may be stored in the storage unit 106. The control unit 104 may control the switch 32-1 to turn off and control the switch 32-2 to turn on. As a result, the distributed power source 30-1 to be connected is electrically connected to the power transmission line 20 whose degree of congestion is lower than that of the power transmission line 10. Similarly, the power distribution control device 100 may turn off the switch 32-3 and turn on the switch 32-4. As a result, the distributed power source 30-2 to be connected is electrically connected to the power transmission line 20 whose degree of congestion is lower than that of the power transmission line 10.

The control unit 104 controls one or more distributed power sources 30-1 and 30-2 electrically connected to the power transmission line 10 in an initial state based on the congestion degree of the power transmission line 10 and the congestion degree of the power transmission line 20. Of these, the number or type of distributed power sources that are switched to be electrically connected to the power transmission line 20 may be determined. Based on the congestion level of the power transmission line 10 and the congestion level of the power transmission line 20, the control unit 104 connects only one of the distributed power sources 30-1 and 30-2 to which the connection is switched from the power transmission line 10 to the power transmission line. 20 , and both distributed power sources 30 - 1 and 30 - 2 may be switched to be electrically connected from power transmission line 10 to power transmission line 20 . For example, the larger the difference between the congestion degree of the power transmission line 20 and the congestion degree of the power transmission line 20, the greater the number of distributed power sources that can be switched to be electrically connected to the power transmission line 20. For example, the greater the difference between the congestion degree of the power transmission line 20 and the congestion degree of the power transmission line 20, the more types of distributed power sources that can be switched to be electrically connected to the power transmission line 20 may be increased.

In FIG. 3 , the power distribution control device 100 may include a storage unit 106 , a power generation information acquisition unit 108 , a calculation unit 110 , a measurement result acquisition unit 112 , a power generation suppression change instruction unit 114 , and a communication unit 116 . Storage unit 106 stores various data and parameters. The storage unit 106 is a facility containing information about specifications such as arrangement, connection, and rating of power transmission lines (10, 20), power distribution systems (13, 23), multiple switches 32, multiple distributed power sources 30, etc. Information may be stored in advance.

The storage unit 106 may store the calculation results calculated by the calculation unit 110. The power generation information acquisition unit 108 acquires actual power generation information of the distributed power sources 30-1 to 30-4. The generated power actual measurement information may be an actual generated power value or a value associated with the actual generated power value. For example, the actual measured value of generated power is the actual measured value of generated power by a solar power generation facility. The measurement result acquisition unit 112 acquires electrical measurement results at multiple points within the power distribution line.

The measurement result acquisition unit 112 may acquire electrical measurement results at multiple points in each of the distribution lines (feeders) 16-1 to 16-3 and 26-1 to 26-3 in FIG. For example, voltage, current, and power factor are measured by measuring instruments installed at multiple points on each power distribution line. The measuring device may be built into the switches 32-1 to 32-4, or may be provided separately. The measurement result acquisition unit 112 may receive electrical measurement results at multiple points within the power distribution line from a measuring device.

The calculation unit 110 calculates the load in multiple sections within each distribution line and the power generated by the distributed power source 30 from the electrical measurement results and the actual power generation information. Specifically, the calculation unit 110 calculates the state of the distributed power source 30 on each of the distribution lines 16-1 to 16-3, 26-1 to 26-3, and the status of the distributed power source 30 on each of the distribution lines 16-1 to 16-3, Based on the measurement results of current, voltage, and power factor at multiple points within the area of 26-1 to 26-3, each distribution line 16-1 to 16-3, 26-1 to 26-3 is The load in multiple sections and the power generated by the distributed power source may be calculated. For example, calculation unit 110 calculates the load and generated power in multiple sections within distribution line 16-1. Similarly, calculation unit 110 calculates the load and generated power in multiple sections within distribution line 26-1.

The calculation unit 110 may perform power flow calculation based on the load and generated power in multiple sections of each distribution line. Based on the result of the power flow calculation by the calculation unit 110, the control unit 104 satisfies a predetermined condition when switching the distribution lines to which the distributed power sources 30-1 and 30-2 are connected. You may decide whether or not.

The control unit 104 may determine whether the voltage and current in each distribution line (feeder) 16-1 to 16-3 and 26-1 to 26-3 do not exceed a predetermined range. The control unit 104 may determine whether the supplied power does not exceed the limits of the distribution lines (feeders) 16-1 to 16-3 and 26-1 to 26-3. The power distribution control device 100 may include a determination unit (simulator) in addition to the control unit 104. In this case, the determination unit may determine whether a predetermined condition is satisfied when switching the distribution lines to which the distributed power sources 30-1 and 30-2 are connected. The control unit 104 may adjust the range of switching the distribution lines to which the distributed power sources 30-1 and 30-2 to which the connection is to be switched are connected, based on the result of the power flow calculation by the calculation unit 110.

In FIG. 3, the communication unit 116 transmits switching control signals for the switches 32-1 to 32-4. The power generation suppression change instruction unit 114 instructs the command device 500 to instruct the command device 500 to generate power when the power transmission lines 10 and 20 to which at least one of the distributed power sources 30-1 and 30-2 to which connection is to be switched is electrically connected is switched. May notify or indicate suppression changes. When the congestion degree of the power transmission line 10 is higher than the congestion degree of the power transmission line 20, the command device 500 may transmit a power generation suppression command to each distributed power source 30 electrically connected to the power transmission line 10. be. According to the power distribution control device 100 of the present embodiment, the degree of congestion is reduced, so power generation suppression for each distributed power source 30 is unnecessary or reduced.

The number and types of distributed power sources 30 are not limited to the case shown in FIG. 3. Furthermore, the connection form of the first power distribution system 13 and the second power distribution system 23 and the number of power transmission lines 10 and power transmission lines 20 are not limited to those shown in FIG. 3.

4 and 5 are diagrams illustrating an example of a process for switching the connection relationship of the distributed power sources 30 in the first embodiment. FIG. 4 shows an example of a state before the connection relationship of the distributed power source 30 is switched, and FIG. 5 shows an example of a state after the connection relationship of the distributed power source 30 is changed. Note that the power transmission line 10 and the power transmission line 20 may be electrically connected to the main power transmission system 402 shown in FIG. 1 via the substation 4.

In FIGS. 4 and 5, the thickness of the arrows schematically indicates the magnitude of the tidal power at each point. In FIGS. 4 and 5, a circle mark in the switch 32 means that the switch 32 is turned on (closed). The x mark in the switch 32 means that the switch 32 is off (open).

In the examples shown in FIGS. 4 and 5, distributed power sources 30-1 to 30-9 include distributed power sources 30-1 and 30-2 to which connection switching is to be performed. The distributed power sources 30-1 and 30-2 to be connected are connectable to the first power distribution system 13 via at least one first switch 32-1, and are connectable to the first power distribution system 13 via at least one second switch 32-1. It is also possible to connect to the second power distribution system 23 via 2.

When the congestion degree of the power transmission line 10 is higher than the congestion degree of the power transmission line 20 and the congestion degree of the power transmission line 10 is higher than a predetermined first threshold value, the control unit 104 connects the distributed power source 30 to which the connection is to be switched. -1 and 30-2 from the first power distribution system 13 (power distribution line 16-1 in FIGS. 4 and 5). At the same time, the switch 32-2 (second switch) is switched on so as to be electrically connected to the second power distribution system 23 (power distribution line 26-1 in FIGS. 4 and 5). Through such control, it is possible to prevent the distributed power sources 30-1 and 30-2 to be connected to each other from being electrically connected to a plurality of power distribution systems to form a loop circuit as much as possible. In the example shown in FIGS. 4 and 5, a set of first switch 32-1 and second switch 32-2 connects the plurality of distributed power sources 30-1 and 30-2. It is possible to switch the power distribution system.

FIG. 6 is a flowchart illustrating an example of processing by the power distribution control device 100. The congestion degree acquisition unit 102 acquires congestion information for each power transmission line 10, 20 (step S101). In this example, the control unit 104 determines whether there is one power transmission line (first power transmission line) whose congestion degree is equal to or higher than a first threshold value (step S102). If there is a power transmission line whose congestion degree is equal to or higher than the first threshold (step S102: YES), the control unit 104 controls a distributed power source electrically connected to the power transmission line 10 (first power transmission line). 30 controls the switch 32 so that it is electrically connected to another power transmission line (step S103). The power generation suppression change instruction unit 114 may notify the command device 500 of systems in which power generation can be suppressed (step S104).

In the example shown in FIG. 6, after the command device 500 instructs the distributed power sources 30 to suppress power generation according to the degree of congestion of each power transmission line, the power distribution control device 100 switches connection targets based on the content of the power generation suppression command. The power transmission lines to which the distributed power sources 30-1 and 30-2 are connected are switched. However, the power distribution control device 100 of this embodiment is not limited to this case. Before the command device 500 actually instructs the distributed power sources 30 to suppress power generation according to the congestion degree of each power transmission line, the congestion degree acquisition unit 102 of the power distribution control device 100 obtains information regarding the congestion degree of each power transmission line. may be obtained. Before the command device 500 transmits a power generation suppression command to the distributed power source 30, the control unit 104 controls the connection of the distributed power sources 30-1 and 30-2 to be switched depending on the congestion degree of each power transmission line. You may also switch the destination power line. In this case, it is possible to prevent the distributed power source 30 from actually suppressing power generation.

Further, in the example shown in FIG. 6, the control unit 104 determines whether there is a power transmission line (first power transmission line) whose congestion degree is equal to or higher than the first threshold (step S102). However, the power distribution control device 100 of this embodiment is not limited to this case. For example, instead of comparing the congestion degree with the first threshold value, the control unit 104 may control the case where the congestion degree of the first power transmission line becomes higher than the predetermined value compared to the congestion degree of the second power transmission line. In other words, when the degree of congestion on the first power transmission line and the degree of congestion on the second power transmission line become unbalanced by exceeding a predetermined degree, the distributed power source electrically connected to the power transmission line 10 The control unit 104 may control the switch 32 so that at least a portion of the switch 30 is electrically connected to the power transmission line 20 .

FIG. 7 is a flowchart illustrating an example of switch control processing by the power distribution control device 100. FIG. 7 may be a subroutine of step S103 in the flowchart of FIG. The control process shown in FIG. 7 will be explained with reference to FIGS. 4 and 5.

The control unit 104 reads equipment information stored in the storage unit 106. The control unit 104 may receive equipment information from outside the power distribution control device 100. Based on the equipment information, the control unit 104 can be connected to the first power distribution system 13 via the switch 32-1 (first switch), and can be connected to another power distribution system (for example, the second power distribution system 23). Information on the distributed power sources 30-1 and 30-2 to be connected and switched, which can be connected via another switch 32-2 (second switch), is acquired (step S10).

The control unit 104 selects another power transmission line to which the distributed power sources 30-1 and 30-2 to be connected are electrically connectable (step S11). In the example shown in FIGS. 4 and 5, power transmission line 20 is selected. The congestion degree acquisition unit 102 acquires the congestion degree of the other selected power transmission line (step S12). In the case shown in FIG. 7, the congestion degree acquisition unit 102 sequentially acquires the congestion degrees of the other selected power transmission lines from the command device 500. However, the power distribution control device 100 of this embodiment is not limited to this case. The congestion degree acquisition unit 102 may acquire the congestion degrees of all power transmission lines from the command device 500 in advance.

The control unit 104 compares the congestion degree of the power transmission line 10, which is the first power transmission line, with the congestion degree of the other selected power transmission line (step S13). If the congestion degree of the first power transmission line is higher than the congestion degree of the other selected power transmission line (step S13: YES), the control unit 104 transfers the selected power transmission line to the connection switching target of interest. is determined as one of the candidates for the connection change destination of the distributed power sources 30-1 and 30-2 (step S14). The control unit 104 may repeat the processes from step S11 to step S15 until the selection of all other connectable power transmission lines is completed (step S15: YES).

There may also be a plurality of other power transmission lines that are candidates for the connection change destination of the distributed power sources 30-1 and 30-2 to be connected. The control unit 104 selects a connection destination power transmission line to which each distributed power source 30 is connected based on the congestion degree of the power transmission lines of the plurality of connection destination candidates and the predicted power value of the distributed power source 30 to be connected. (second power transmission line) may be determined (step S16). Further, the control unit 104 may determine the type and number of distributed power sources 30 to be connected to be switched based on the congestion degree of the power transmission line 10 and the congestion degree of other power transmission lines (step S16). The power transmission line to which each distributed power source 30 is to be connected may be determined so that each distributed power source 30-1 and 30-2 is electrically connected to a separate power transmission line.

The control unit 104 controls the switch 32 so that the distributed power source 30 to be connected is electrically connected to the power transmission line 20 determined as the connection change destination in step S16 (step S17). Specifically, the control unit 104 transmits a switching control signal from the communication unit 116 to the corresponding switch 32.

FIG. 8 is a flowchart illustrating an example of a process performed by the power distribution control device 100 to restore the connection relationship of the distributed power sources. The congestion degree acquisition unit 102 acquires information regarding the congestion degree of each power transmission line 10, 20 (step S111). The control unit 104 switches off at least one of the first switches (switch 32-1, etc. in FIGS. 4 and 5) and switches off at least one of the first switches (switch 32-2, etc. in FIGS. 4 and 5). After switching on (step S103 in FIG. 6), if the congestion degree of the power transmission line 10 becomes equal to or less than a second threshold value which is preset to a value equal to or less than the first threshold value (step S112: YES), The control unit 104 may control the switch 32 so that the distributed power sources 30-1 and 30-2 electrically connected to the power transmission line 20 are electrically connected to the original power transmission line 10. . The control unit 104 turns on the first switch (such as the switch 32-1 in FIGS. 4 and 5) and turns on the second switch (such as the switch 32-1 in FIGS. 4 and 5) to electrically connect to the second power distribution system. at least one of the switches 32-2, etc. at 5 is switched off.

As described above, according to the power distribution control device 100 of this embodiment, the shortage of power transmission capacity can be resolved by linking with the command device 500, which is a host system. In particular, according to the power distribution control device 100, the power distribution system can be rearranged in the power distribution automation system 1 so as to contribute to securing power transmission capacity. The power distribution control device 100 does not switch (shift) the connection of the distributed power source 30 with a large reverse power flow voltage to the power distribution system under the congested power transmission system. The power distribution control device 100 can prevent or reduce power generation suppression by switching the connection of the distributed power source 30 so that it is electrically connected to a power transmission line that is not congested. Therefore, lost profits due to suppressing the power generated by the distributed power source 30 can be reduced.

FIG. 9 is a diagram illustrating an example of control contents of the power distribution control device in a modification of the first embodiment. In this example, the second power distribution system 23 includes one or more second power distribution lines 26-1 and 26-2. In particular, the connection state of the second distribution line 26-1 is such that in FIG. 32-2 is switched on.

In the example shown in FIG. 9, the second power distribution line 26-1 and the second power distribution line 26-2 may be connected to the power transmission line 20 via the second transformer equipment 22. A feeder circuit breaker 24-1 is provided between the second distribution line 26-1 and the second transformer equipment 22. A feeder circuit breaker 24-2 is provided between the second distribution line 26-2 and the second transformer equipment 22.

Measuring instruments 28-1, 28-2, 28-3, and 28-4 are provided at multiple points within the second power distribution line 26-1. The second distribution line 26-1 is divided into multiple sections including a first section, a second section, and a third section. A distributed power source 30-1 and a load 36-1 are connected to the first section between the measuring instruments 28-1 and 28-2. A distributed power source 30-2 and a load 36-2 are connected to the second section between the measuring instruments 28-2 and 28-3. A distributed power source 30-3 and a load 36-3 are connected to the third section between the measuring instruments 28-3 and 28-4. Measuring devices 28-1, 28-2, 28-3, and 28-4 measure current, voltage, and power factor at multiple points within second distribution line 26-1.

Similarly, measuring instruments 28-5, 28-6, 28-7, and 28-8 are provided at multiple points within the second power distribution line 26-2. A distributed power source 30-4 and a load 36-4 are connected to the first section between the measuring instruments 28-5 and 28-6. A distributed power source 30-5 and a load 36-5 are connected to the second section between the measuring instruments 28-6 and 28-7. A distributed power source 30-6 and a load 36-6 are connected to the third section between the measuring instruments 28-7 and 28-8. Measuring devices 28-5, 28-6, 28-7, and 28-8 measure current, voltage, and power factor at multiple points within second distribution line 26-2. Although the second power distribution system 23 is shown in FIG. 9, the configuration shown in FIG. 9 may also be provided in the first power distribution system 13.

FIG. 10 is a block diagram showing an example of a schematic configuration of the power distribution control device 100 in a modification of the first embodiment. The power distribution control device 100 includes a control information acquisition section 113 and a determination section 117 in addition to the configuration shown in FIG. As shown in FIGS. 4 and 5, the switch 32-1 (at least one of the first switches) is switched off depending on the congestion level of the power transmission line 10 and the congestion level of the second power transmission line, and In the state where the switch 32-2 (second switch) is turned on, the calculation unit 110 calculates the first power consumption based on the electrical measurement results at a plurality of points in each first distribution line 16, as described later. The respective loads in multiple sections within one distribution line 16 and the generated power of the distributed power source 30 are calculated. Similarly, in a state where the switch 32-1 is switched off and the switch 32-2 is switched on, the calculation unit 110 calculates the Based on the electrical measurement results, the respective loads in the plurality of sections within the second distribution line 26 and the generated power of the distributed power source 30 are calculated.

The control information acquisition unit 113 acquires control information from the command device 500. The control information is information used to limit the output of the distributed power source 30 connected to each first distribution line 16-1, 16-2 or each second distribution line 26-1, 26-2. The calculation unit 110 calculates the load and the generated power of the distributed power source 30 in multiple sections within each first distribution line and multiple sections within each second distribution line based on the control information and the electrical measurement results. It's fine. In particular, the calculation unit 110 calculates the load in multiple sections within each distribution line and the power generated by the distributed power source 30 from the electrical measurement results, the actual power generation information, and the control information. Furthermore, the calculation unit 110 may perform power flow calculation based on the loads in multiple sections of each distribution line and the generated power of the distributed power source 30.

In FIG. 10, the determination unit 117 determines whether or not one distribution line can be connected to another distribution line based on the load calculated by the calculation unit 110 and the power generated by the distributed power source 30. do. For example, in FIG. 9, the determining unit 117 determines whether or not the second distribution line 26-2 (one distribution line) and the second distribution line 26-1 (another distribution line) can be connected. . The determination unit 117 may perform the power flow calculation based on the loads in each of the plurality of sections of one distribution line and the other distribution line and the generated power of the distributed power source 30. The determination unit 117 determines whether a predetermined condition is satisfied when one power distribution line is connected to another power distribution line by power flow calculation. The predetermined conditions include whether the voltage is maintained within the proper range, whether the power supplied by the distribution line does not exceed a predetermined upper limit, and whether the power is transmitted from one distribution line to another. At least one of the conditions may be included, such as whether an automatic voltage regulator in another power distribution line will malfunction in the case where the automatic voltage regulator in another power distribution line does not malfunction.

When a failure occurs in a part of one distribution line (for example, distribution line 26-1 in FIG. 9), feeder circuit breaker 24-1 receives a command from distribution control device 100 to disconnect distribution line 26-1. Cut off from the power transmission line 20. Further, the power distribution control device 100 controls the distributed power sources 30-1, 30-2, and 30-3 in the one power distribution line 26-1 to be disconnected from the one power distribution line 26-1. Then, when the determination unit 117 determines that connection is possible between the one distribution line 26-1 and the other distribution line 26-2, the control unit 104 connects the one distribution line 26-1 and the other distribution line 26-2. Switch 32-6 connecting to other distribution line 26-2 is turned on (closed). As a result, at least a part of the distribution line (for example, the second distribution line 26-1) where a failure occurs and the electrical connection with the power transmission line 20 is interrupted by the feeder circuit breaker 24-1, Electric power can be exchanged from the electric wire (for example, the second power distribution line 26-2).

FIG. 11 is a flowchart illustrating an example of a process for connecting a plurality of power distribution lines in a modification of the first embodiment. When a failure occurs in one distribution line (step S201: YES), the calculation unit 110 calculates the loads and the generated power of the distributed power source 30 in multiple sections within the one distribution line and other distribution lines. (Step S202). The determination unit 117 selects another power distribution line connected via the switch 32 to the one power distribution line in which the failure has occurred (step S203). When a failure occurs in one distribution line, the determining unit 117 determines whether or not the one distribution line in which the failure has occurred can be connected to another distribution line (step S204). If one power distribution line and another power distribution line are not connectable (step S204: NO), the determination unit 117 selects another power distribution line (step S203). If it is determined that the first distribution line and the other distribution line can be connected (step S204: YES), the control unit 104 turns on the switch 32 that connects the first distribution line and the other distribution line. (closed) to electrically connect one distribution line and another distribution line (step S205). However, the processing of the power distribution control device 100 is not limited to the case shown in FIG. 11.

FIG. 12 is a flowchart showing another example of the process of connecting a plurality of power distribution lines in a modification of the first embodiment. The calculation unit 110 calculates the loads and the generated power of the distributed power source 30 in multiple sections of one distribution line and multiple sections of other distribution lines, regardless of whether a failure has occurred in one distribution line. may be calculated (step S301). The calculation results of the generated power and the load are stored in the storage unit 106 (step S302). Then, when a failure occurs in one distribution line (step S303: YES), the determination unit 117 determines the distance between one distribution line and another distribution line based on the calculation result stored in the storage unit 106. It is determined whether connection is possible (step S304 and step S305). The control unit 104 turns on (closes) the switch 32 that connects one distribution line and another distribution line to electrically connect one distribution line and another distribution line (step S306 ). In FIG. 12, other processing contents are the same as those in FIG. 11. Therefore, repeated explanation will be omitted.

FIG. 13 is a flowchart illustrating an example of power and load calculation processing in a modification of the first embodiment. FIG. 13 may be a subroutine of the process in step S202 of FIG. 11 or step S301 of FIG. 12.

The measurement result acquisition unit 112 acquires measurement results such as current, voltage, and power factor at multiple points within each power distribution line (step S21). In particular, as shown in FIG. 9, the measurement results obtained by the plurality of measuring instruments 28-1 to 28-8 placed on each distribution line (second distribution lines 26-1 and 26-2 in FIG. 9) are obtained. The unit 112 may receive the information. The power generation information acquisition unit 108 acquires actual power generation information from each distributed power source 30 (step S22). For example, the actual power generation information is an actual measurement value of the power generated by the solar power generation equipment. As shown in FIG. 9, the calculation unit 110 calculates a plurality of sections (the first section, the second section, and the second section in FIG. 3) are calculated (step S23).

The control information acquisition unit 113 acquires control information from the command device 500 (step S24). The control information is information used to limit the output of the distributed power source 30 connected to each first distribution line 16-1, 16-2 or each second distribution line 26-1, 26-2. The calculation unit 110 calculates multiple sections (the first section, the second section, and the second section in FIG. 9) within each distribution line (for example, the second distribution lines 26-1 and 26-2 in FIG. 3) are recalculated (corrected calculations) (step S25). Note that the processing order of steps S21, S22, and S24 is only an example, and the power distribution control device 100 adjusts the loads and distributed power sources in multiple sections within the distribution line based on the control information and the electrical measurement results. Any method that calculates the generated power may be used. Furthermore, the power distribution control device 100 may calculate the loads in multiple sections within the distribution line and the power generated by the distributed power source based on the actual power generation information and the electrical measurement results.

The control information in step S24 may be failure information on any power transmission line (for example, power transmission line 10 or power transmission line 20). The failure information may be N-1 power restriction information (N-1 power restriction information). When N-1 power system is adopted, if a failure occurs in any power transmission line, the relay device 506 disconnects the distributed power source 30 electrically connected to the power transmission line where the failure has occurred from the power transmission line ( (disarrangement). In this case, the calculation unit 110 assumes that the power from each distributed power source 30 is zero, regardless of the actual power generation information acquired by the power generation information acquisition unit 108, and calculates the power output from each distribution line (distribution line 26-1 in FIG. , 26-2) (the first section, second section, and third section in FIG. 9) may be recalculated (corrected calculation) (step S25). Thereby, it is possible to accurately estimate the generated power and load by reflecting the interruption of the distributed power source 30.

The control information may be power generation suppression information that causes the distributed power source 30 to suppress the generated power. When a power generation suppression command is transmitted from the command device 500 to each distributed power source 30, the power supplied from the distributed power source 30 to the distribution line is suppressed. The remaining power generated by the distributed power source 30 may be stored in a storage battery or the like. In this case, the calculation unit 110 multiplies the power from each distributed power source 30 by a coefficient corresponding to the suppression command, regardless of the actual power generation information acquired by the power generation information acquisition unit 108, and then calculates the Recalculate (correction calculation) the generated power and load in multiple sections (first section, second section, and third section in Fig. 9) within the distribution line (distribution lines 26-1 and 26-2 in Fig. 9). It's fine. This makes it possible to accurately estimate generated power and load by reflecting the contents of the power generation suppression command in the output of the distributed power source.

Note that there may be a plurality of other power distribution lines that can be connected to one power distribution line. In this case, the determination unit 117 may select other distribution lines in order of distance from one distribution line. Alternatively, other power distribution lines may be selected in order of decreasing congestion of the power transmission line when electrically connected to one power distribution line virtually. Further, as described below, a wiring line electrically connected to a power transmission line in which no failure has occurred may be selected as another power distribution line first.

FIG. 14 is a flowchart illustrating an example of a process for selecting another power distribution line to which one power distribution line is connected in a modification of the first embodiment. The process in FIG. 14 is an example of the process in step S203 shown in FIG. 11 or step S304 shown in FIG. 12. The control information may include power transmission line failure information. When a failure occurs in the power transmission line (step S31), the control information acquisition unit 113 acquires failure information of the power transmission line. The determination unit 117 selects another power distribution line to which one power distribution line is connected from among the plurality of power distribution lines based on the power transmission line failure information (step S32).

FIG. 15 is a diagram illustrating an example of a process for selecting another power distribution line to which one power distribution line is connected in a modification of the first embodiment. In FIG. 15, a second power distribution line 26-2 is shown as one power distribution line. FIG. 15 shows a case where a failure occurs in the second distribution line 26-2. As other distribution lines, the second distribution line 26-1 and the second distribution line 26-3 are candidates. No failure has occurred in the power transmission line 20c to which the power distribution line 26-3 is electrically connected. On the other hand, a failure has occurred in the power transmission line 20a to which the power distribution line 26-1 is electrically connected. In this case, the determination unit 117 avoids the power distribution line 26-1 electrically connected to the power transmission line 20a where the failure has occurred, based on the failure information about each power transmission line 20a, 20b, and 20c. The power distribution line 26-3 electrically connected to the power transmission line 20c that is not connected may be selected as the other power distribution line.

As described above, according to the power distribution control device in the modification of the first embodiment, the power distribution system to which the plurality of distributed power sources 30-1 and 30-2 are connected is switched based on the congestion degree of the power transmission line. In this state, even if a failure occurs in one distribution line of the distribution system, it becomes possible to transfer power from other distribution lines.

[Second embodiment]

FIG. 16 is a diagram illustrating an example of control contents of the power distribution control device 200 in the second embodiment. Although the power distribution control device 100 in the first embodiment has a configuration that changes the connection destination of the distributed power source based on the degree of congestion of the power transmission line, the present invention is not limited to this case.

The power distribution automation system 5 in the second embodiment may acquire control information transmitted to each power generation facility from the command device 500, which is a host system. The power distribution automation system 5 uses various information acquired from the command device 500 to control switches in the wiring. The power distribution automation system 5 may be any system that remotely controls switches, and may be called by other names such as a monitoring system or a control system.

The power distribution automation system 5 includes a power distribution control device 200 and a terminal device 201. The power distribution control device 200 is also called a power distribution automation server. The terminal device 201 is also called a client terminal. The power distribution automation system 5 may include a plurality of terminal devices 201. Power distribution control device 200 and terminal device 201 are communicably connected via a communication line. The power distribution automation server is installed, for example, in a general office of an electric power company, and the terminal device 201 is installed, for example, in each office. In this specification, the power distribution control device 200 may be any device that remotely controls a switch in a power distribution system, and may be a device called a monitoring device, a control device, a monitoring server, a control server, etc. It's good.

A power distribution line 46-1 is electrically connected to the power transmission lines 40a-1 and 40b-1 via a transformer equipment 42-1. A power distribution line 46-2 is electrically connected to the power transmission lines 40a-2 and 40b-2 via a transformer equipment 42-2. Note that the power distribution line 46-1 and the power distribution line 46-2 may be collectively referred to as the power distribution line 46. From the perspective of power system reliability, even if one transmission line 40a-1 fails, another transmission line 40b-1 is provided to ensure power transmission capacity. .

Therefore, the power transmission lines 40a-1 and 40b-1 have the power transmission capacity for two lines. Similarly, the power transmission lines 40a-2 and 40b-2 have a power transmission capacity for two lines. Note that the power distribution line 46-1 and the power distribution line 46-2 may be electrically connected to different power transmission lines, as shown in FIG. Unlike the case shown in FIG. 16, the power distribution line 46-1 and the power distribution line 46-2 may be electrically connected to the same power transmission line.

A feeder circuit breaker (FCB) 44-1 is provided between the power distribution line 46-1 and the transformer equipment 42-1. When receiving a command from the power distribution control device 200 or the like, the feeder circuit breaker (FCB) 44-1 electrically disconnects the power distribution line 46-1 from the power transmission lines 40a-1 and 40b-1. Similarly, a feeder circuit breaker 44-2 is provided between the power distribution line 46-2 and the transformer equipment 42-2. The feeder circuit breaker 44-2 electrically disconnects the power distribution line 46-2 from the power transmission lines 40a-2 and 40b-2 upon receiving a command from the power distribution control device 200 or the like.

A plurality of power distribution lines may be provided to the power transmission lines 40a-1 and 40b-1 via a plurality of feeder circuit breakers. The plurality of power distribution lines may constitute a power distribution system. Similarly, a plurality of power distribution lines may be provided to the power transmission lines 40a-2 and 40b-2 via a plurality of feeder circuit breakers.

Distributed power sources 50-1 to 50-6 (sometimes collectively referred to as distributed power sources 50) may be electrically connected to each distribution line 46-1, 46-2. Distributed power source 50 is, for example, solar power generation equipment or wind power generation equipment. Further, each distribution line is provided with loads 56-1 to 56-6 (sometimes collectively referred to as loads 56).

Measuring devices 48-1, 48-2, 48-3, and 48-4 are provided at multiple points within the power distribution line 46-1. A distributed power source 50-1 and a load 56-1 are connected to the first section between the measuring instruments 48-1 and 48-2. A distributed power source 50-2 and a load 56-2 are connected to the second section between the measuring instruments 48-2 and 48-3. A distributed power source 50-3 and a load 56-3 are connected to the third section between the measuring instruments 48-3 and 48-4. Measuring devices 48-1, 48-2, 48-3, and 48-4 measure current, voltage, and power factor at multiple points within power distribution line 46-1.

Similarly, measuring devices 48-5, 48-6, 48-7, and 48-8 are provided at multiple points within the other power distribution line 46-2. A distributed power source 50-4 and a load 56-4 are connected to the first section between the measuring instruments 48-5 and 48-6. A distributed power source 50-5 and a load 56-5 are connected to the second section between the measuring instruments 48-6 and 48-7. A distributed power source 50-6 and a load 56-6 are connected to the third section between the measuring instruments 48-7 and 48-8. Measuring devices 28-5, 28-6, 28-7, and 28-8 measure current, voltage, and power factor at multiple points within another power distribution line 46-2.

When a failure (referred to as an N-1 failure) occurs in one line of the power transmission lines 40a-1 and 40b-1, the relay device 506 connects each distribution line electrically connected to the power transmission lines 40a-1 and 40b-1. The type power supplies 50-1 to 50-3 are cut off (disconnected) from the distribution line 46-1 (distribution system). In this way, the operational capacity is expanded on the premise that power supply suppression (power limitation) will be executed instantaneously if a failure occurs in one of the power transmission lines 40a-1 and 40b-1. This kind of processing is called "N-1 electricity control." Note that the other power transmission lines 40a-2 and 40b-2 may also be provided with relay devices to perform similar processing. The command device 500 acquires information about the occurrence of a failure in one of the power transmission lines 40a-1 and 40b-1 from the relay device 506 as failure information.

FIG. 17 is a diagram illustrating an example of the processing contents of the N-1 electricity restriction. During normal operation, the power transmission lines 40a-1 and 40b-1 allow power transmission below the upper limit of the power transmission capacity for two lines, but exceeding the upper limit of the power transmission capacity for one line. On the other hand, when a failure occurs in one of the power transmission lines 40a-1 and 40b-1, power supply suppression (power supply power limitation) is instantaneously executed. Processing at the time of such a failure is called N-1 power restriction (N-1 power limitation). For example, when adopting N-1 power grid, if a failure occurs in any power transmission line, the relay device 506 disconnects the distributed power source 50 electrically connected to the power transmission line where the failure has occurred from the power transmission line. Cut off (disconnect).

FIG. 18 is a block diagram showing an example of a schematic configuration of a power distribution control device 200 in the second embodiment. In one example, the power distribution control device 200 includes a control information acquisition section 202, a measurement result acquisition section 204, a power generation information acquisition section 206, a calculation section 208, a determination section 210, a storage section 212, a control section 213, and a communication section 214.

The control information acquisition unit 202 acquires control information used to limit the output of the distributed power sources 50 connected to one or more distribution lines 46-1 and 46-2 (sometimes collectively referred to as distribution lines 46). . The power distribution line 46 includes transformer equipment 42-1 and transformer equipment 42-2 (transformer (sometimes collectively referred to as equipment 42). The control information acquisition unit 202 may acquire control information from the command device 500 via a communication line. In this example, the control information includes failure information (N-1 power control information) on any of the power transmission lines 40-1, 40-2, etc.

The measurement result acquisition unit 204 acquires electrical measurement results at multiple points within the power distribution line 46. The measurement result acquisition unit 204 may acquire the measurement results of the current, voltage, and power factor at multiple points within the power distribution line 46 from each of the measuring instruments 48-1 to 48-8 shown in FIG. The power generation information acquisition unit 206 acquires actual power generation information of the distributed power sources 50-1 to 50-8. For example, the actual power generation information is an actual measurement value of the power generated by the solar power generation equipment.

The calculation unit 208 calculates the load in multiple sections within each distribution line and the generated power of the distributed power source based on the control information and the electrical measurement results. Specifically, the calculation unit 208 calculates the amount of energy within the distribution line based on the state of the distributed power source 50 on the distribution line and the measurement results of current, voltage, and power factor at multiple points within the area of the distribution line. The load in multiple sections and the generated power of the distributed power source may be calculated.

The status of the distributed power sources 50 on the distribution line is obtained from the control information. The calculation unit 208 calculates the load in multiple sections in each distribution line and the generated power of the distributed power source 50 based on the failure information (N-1 power control information), the electrical measurement results, and the actual measured value of the generated power. calculate. Calculation unit 208 calculates the load in multiple sections within distribution line 46-1 and the power generated by distributed power source 50. Similarly, the calculation unit 208 calculates the load in multiple sections within the distribution line 46-2 and the power generated by the distributed power source 50.

FIG. 19 is an example of power and load before power limitation. FIG. 20 is an example of power and load after power limitation. In FIGS. 19 and 20, the first section, the second section, and the third section may mean the first section, the second section, and the third section, which are multiple sections in the distribution line 46-1 in FIG. 16. .

In the example shown in FIGS. 19 and 20, before the N-1 power outage, the power output to the distribution line 46-1 in the first section is 10 KW, and the power output to the distribution line 46-1 in the second section is 30 KW, and the power output to the distribution line 46-1 in the third section is 20 KW. On the other hand, after the N-1 power outage, the distributed power sources 50-1, 50-2, and 50-3 are cut off (disconnected) from the distribution line 46-1, so the distribution line 46- 1, the power output to the distribution line 46-1 in the second section is 0KW, and the power output to the distribution line 46-1 in the third section is 0KW. As shown in FIGS. 19 and 20, in this example, the load does not change before the N-1 power cutoff and after the N-1 power cutoff.

In FIG. 18, the determination unit 210 determines whether or not one distribution line can be connected to another distribution line based on the load calculated by the calculation unit 110 and the power generated by the distributed power source 50. do. For example, in FIG. 16 described above, the determining unit 210 determines whether or not the power distribution line 46-1 (one power distribution line) and the power distribution line 46-2 (another power distribution line) can be connected. The determination unit 210 may perform the power flow calculation based on the loads in each of the plurality of sections of one distribution line and the other distribution line and the generated power of the distributed power source 50. The determination unit 210 determines whether a predetermined condition is satisfied when one power distribution line is connected to another power distribution line by power flow calculation. The predetermined conditions include whether the voltage is maintained within the proper range, whether the power supplied by the distribution line does not exceed a predetermined upper limit, and whether the power is transmitted from one distribution line to another. At least one of the conditions may be included, such as whether an automatic voltage regulator in another power distribution line will malfunction in the case where the automatic voltage regulator in another power distribution line does not malfunction.

When a failure occurs in a part of one distribution line (for example, distribution line 46-1 in FIG. 16), feeder breaker 44-1 receives a command from distribution control device 200, and disconnects distribution line 46-1. Cut off from power transmission lines 40a-1 and 40b-1. Further, the power distribution control device 100 controls the distributed power sources 50-1, 50-2, and 50-3 in one power distribution line to be disconnected from the one power distribution line. When the determination unit 210 determines that the one distribution line and the other distribution line are connectable, the determination unit 210 connects the one distribution line and the other distribution line via the communication unit 214. Turn on (close) the switch 52-1 that connects the electric wire. As a result, at least a portion of the distribution line (for example, distribution line 46-1) where a failure has occurred and the electrical connection between the power transmission lines 40a-1 and 40b-1 is interrupted by the feeder circuit breaker 44-1. power can be supplied, that is, accommodated, from another power distribution line (for example, power distribution line 46-2).

The calculation unit 208 calculates the power output from each distribution line (distribution line 46 in FIG. 16) by setting the power from each distributed power source 50 to zero (see FIG. -1, 46-2) in multiple sections (first section, second section, and third section in FIG. 16) may be recalculated (correction calculation). Thereby, it is possible to accurately estimate the generated power and load by reflecting the interruption of the distributed power source 50 due to the N-1 power outage.

FIG. 21 is a diagram illustrating an example of control contents of the power distribution control device 200b according to a comparative example. The power distribution control device 200b shown in FIG. 21 acquires actual power measurement information of the distributed power sources 50-1 to 50-8. The power distribution control device 200b obtains measurement results of current, voltage, and power factor at multiple points within the power distribution line from each of the measuring instruments 48-1 to 48-8. However, unlike the power distribution control device 200 shown in FIGS. 16 and 18, failure information regarding the occurrence of a failure in one of the power transmission lines 40a-1 and 40b-1 is not obtained from the command device 500, which is a host system. In the comparative example, the load in multiple sections within the distribution line and the generated power of the distributed power source 50 are calculated based on the generated power actual measurement information and the electrical measurement results. Therefore, the power distribution control device 200b controls the distributed power sources 50-1, 50-2, and 50-3 to be disconnected from the distribution line by the N-1 power restriction. The fact that the output power to the distribution lines 2 and 50-3 is zero (see FIG. 20) is not taken into account. Therefore, it is difficult for the power distribution control device 200b of the comparative example to accurately estimate generated power and load.

FIG. 22 is a flowchart illustrating an example of processing of the power distribution control device in the second embodiment. The measurement result acquisition unit 204 acquires measurement results such as current, voltage, and power factor at multiple points within each power distribution line (step S41). In particular, as shown in FIG. 16, the measurement result acquisition unit 204 may receive measurement results from a plurality of measuring instruments 48-1 to 48-8 arranged on each of the power distribution lines 46-1 and 46-2. The power generation information acquisition unit 206 acquires actual power generation information from each distributed power source 50 (step S42). For example, the actual power generation information is an actual measurement value of the power generated by the solar power generation equipment. As shown in FIG. 16, the calculation unit 208 calculates a plurality of sections (first section, second section, and third section in FIG. 16) within each distribution line (distribution lines 46-1 and 46-2 in FIG. 16). ) is calculated (step S43).

The control information acquisition unit 202 acquires control information from the command device 500 (step S44). The control information is information used to limit the output of the distributed power sources 50 connected to each power distribution line 46-1 or 46-2. The calculation unit 208 uses the control information to calculate multiple sections (the first section, the second section, and the third section in FIG. 16) within each distribution line (for example, the distribution lines 46-1 and 46-2 in FIG. 16). ) is recalculated (correction calculation) (step S45). Note that the processing order of steps S41, S42, and S44 is only an example, and the power distribution control device 200 adjusts the loads and distributed power sources in multiple sections within the distribution line based on the control information and the electrical measurement results. Any method that calculates the generated power may be used.

The control information in step S44 may be failure information on any power transmission line (for example, power transmission lines 40a-1 and 40b-1 or power transmission lines 40a-2 and 40b-2). The failure information may be information regarding the N-1 power restriction (N-1 power restriction information). When adopting N-1 grid control, when a failure occurs in any power transmission line, the command device 500 controls the distributed power source 50 electrically connected to the power transmission line where the failure has occurred. is disconnected from the power transmission line (decoupled). In this case, the calculation unit 208 calculates that each distribution line (distribution line 46-1 in FIG. 16 , 46-2) (the first section, second section, and third section in FIG. 16) may be recalculated (corrected calculation) (step S45). Thereby, it is possible to accurately estimate the generated power and load by reflecting the interruption of the distributed power source 50.

FIG. 23 is a flowchart illustrating an example of a process for connecting a plurality of power distribution lines in the second embodiment. When a failure occurs in one distribution line (step S401: YES), the calculation unit 208 calculates the loads and the generated power of the distributed power source 50 in multiple sections within the one distribution line and other distribution lines. (Step S402). The processing content of step S402 may be the processing shown in FIG. 22. The determination unit 210 selects another power distribution line that is connected via the switch 52 to the one power distribution line in which the failure has occurred (step S403). When a failure occurs in one distribution line, the determining unit 210 determines whether or not the one distribution line in which the failure has occurred can be connected to another distribution line (step S404). If one power distribution line and another power distribution line are not connectable (step S404: NO), the determination unit 210 selects another power distribution line (step S403). If it is determined that the first distribution line and the other distribution line can be connected (step S404: YES), the control unit 213 turns on the switch 52 that connects the first distribution line and the other distribution line. (closed) to electrically connect one distribution line and another distribution line (step S405). However, the processing of the power distribution control device 200 is not limited to the case shown in FIG. 23.

FIG. 24 is a flowchart showing another example of the process of connecting a plurality of power distribution lines in the second embodiment. The calculation unit 208 calculates the loads and the generated power of the distributed power source 50 in multiple sections in one distribution line and multiple sections in other distribution lines, regardless of whether a failure has occurred in one distribution line. may be calculated (step S501). The process in step S501 may be the process shown in FIG. 22. The calculation results of the generated power and the load are stored in the storage unit 212 (step S502). Then, when a failure occurs in one distribution line (step S503: YES), the determination unit 210 determines whether a failure occurs between one distribution line and another distribution line based on the calculation result stored in the storage unit 212. It is determined whether connection is possible (step S504 and step S505). The control unit 213 turns on (closes) the switch 52 that connects one distribution line and another distribution line, thereby electrically connecting one distribution line and another distribution line (step S506). ). In FIG. 24, other processing contents are the same as those in FIG. 23. Therefore, repeated explanation will be omitted.

FIG. 25 is a flowchart illustrating an example of a process for selecting another power distribution line to which one power distribution line is connected in the second embodiment. The process in FIG. 25 is an example of the process in step S403 shown in FIG. 23 or step S504 shown in FIG. 24. The control information may include power transmission line failure information. When a failure occurs in the power transmission line (step S51), the control information acquisition unit 113 acquires failure information of the power transmission line. The determination unit 210 selects another power distribution line to which one power distribution line is connected from among the plurality of power distribution lines, based on the power transmission line failure information (step S32).

FIG. 26 is a diagram illustrating an example of a process of selecting another distribution line to which one distribution line is connected in the second embodiment. In FIG. 26, a power distribution line 46-2 is shown as one power distribution line. FIG. 26 shows a case where a failure occurs in the power distribution line 46-2. The power distribution lines 46-1 and 46-3 are candidates as other power distribution lines that are connection destinations for receiving power supply. No failure has occurred in the power transmission lines 40a-3 and 40b-3 to which the power distribution line 46-3 is electrically connected. On the other hand, a failure has occurred in the power transmission lines 40a-1 and 40b-1 to which the power distribution line 46-1 is electrically connected. In this case, the determination unit 210 determines whether the power transmission line 40a in which the failure has occurred is based on the failure information about each power transmission line 40a-1, 40b-1, 40a-2, 40b-2, and 40a-3, 40b-3. -1, 40b-1, and avoid the distribution line 46-1, which is electrically connected to the power transmission lines 40a-3, 40b-3, which are not faulty. May be selected as other distribution lines.

As described above, according to the power distribution control device 200 of the second embodiment, even if a failure occurs in one power distribution line in the power distribution system, power can be accommodated by connecting to another power distribution line. becomes possible.

FIG. 27 is a diagram illustrating an example of control contents of the power distribution control device in a modification of the second embodiment. The power distribution automation system 5 in this modification may acquire control information transmitted to each power generation facility from the command device 500, which is a host system. In FIG. 27, a measuring device 507 is provided on the power transmission lines 40a-1 and 40b-1. The measuring device 507 performs electrical measurement to calculate the congestion degree of the power transmission lines 40a-1 and 40b-1. The measurement result by the measuring device 507 is acquired by the command device 500 as power transmission line congestion information. The other power transmission lines 40a-2 and 40b-2 may be similarly provided with measuring instruments.

In this modification, the degree of congestion of a power transmission line is the ratio (utilization rate) of actual power flow to the power transmission capacity indicating the power that can be transmitted by the transmission line, or information associated with the ratio (utilization rate). good. The command device 500 transmits a power generation suppression command to the distributed power sources 50-1 to 50-3 to suppress the generated power based on the congestion degree of the power transmission line.

FIG. 28 is a diagram illustrating an example of power generation suppression content. By the command device 500 transmitting a power generation suppression command to the distributed power sources 50-1 to 50-3, it is possible to suppress the power transmitted in the power transmission line compared to during normal operation. Note that in the modification, the power generation suppression information that the power distribution control device 200 acquires from the command device 500 may be the power generation suppression command itself, or may be information associated with the content of the power generation suppression command.

When the command device 500 transmits a power generation suppression command to each of the distributed power sources 50-1 to 50-3, the power supplied from the distributed power sources 50-1 to 50-3 to the distribution line is suppressed. The remaining power generated by the distributed power sources 50-1 to 50-3 may be stored in a storage battery or the like. The power generation suppression information includes the ratio of the maximum output power to the rated power, the ratio of the power that can be suppressed to the rated power, the value of the maximum output power, the value of the power that should be suppressed, and the actual measured value of the current generated power. The information may be information about the ratio of power that can be outputted at maximum to the actual value of generated power, or the ratio of power that should be suppressed to the current actual measured value of generated power.

The schematic configuration of the power distribution control device 200 in this modification example is the same as the schematic configuration of the power distribution control device 200 in the second embodiment shown in FIG. The same is true. The control information acquisition unit 202 acquires control information used to limit the output of the distributed power source 50 connected to one or more distribution lines 46 connected to the power transmission lines 40a and 40b via the transformer equipment 42. The control information acquisition unit 202 may acquire control information from the command device 500 via a communication line. The communication line may be the Internet. In this example, the control information includes power generation suppression information that causes the distributed power sources 50-1 to 50-3 to suppress the generated power.

The measurement result acquisition unit 204 acquires electrical measurement results at multiple points within the power distribution line 46. The measurement result acquisition unit 204 may acquire the measurement results of the current, voltage, and power factor at multiple points in the distribution line measured by each of the measuring instruments 48-1 to 48-8 shown in FIG. Further, the power generation information acquisition unit 206 acquires actual power generation information of the distributed power sources 50-1 to 50-8. The generated power actual measurement information may be an actual generated power value or a value associated with the actual generated power value. For example, the actual measured value of generated power is the actual measured value of generated power by a solar power generation facility.

The calculation unit 208 calculates the load in the plurality of sections in the distribution line and the generated power of the distributed power source in the plurality of sections based on the control information and the electrical measurement results. Specifically, the calculation unit 208 calculates the current, voltage, and power factor within the distribution line based on the state of the distributed power source 50 on the distribution line and the measurement results of current, voltage, and power factor at multiple points within the area of the distribution line. The load in multiple sections and the power generated by the distributed power source may be calculated. The status of the distributed power sources 50 on the distribution line may be obtained from the control information. In the present embodiment, the calculation unit 208 calculates the load in multiple sections in each distribution line and the distributed power sources 50-1 to 50-3 based on the power generation suppression information, the electrical measurement results, and the actual power generation information. Calculate the generated power. The calculation unit 208 may calculate the generated power and load in multiple sections within each distribution line by multiplying the actual measured value of the generated power before suppression by the suppression coefficient calculated based on the power generation suppression information. The calculation unit 208 may multiply the 50 rated powers of each distributed power source stored in the storage unit 212 by a suppression coefficient calculated based on the power generation suppression information. Calculation unit 208 calculates the load and generated power in multiple sections within distribution line 46-1. Similarly, the calculation unit 208 may calculate the load in multiple sections within the distribution line 46-2 and the power generated by the distributed power source 50.

FIG. 29 is an example of electric power and load after power generation is suppressed. Note that an example of the power and load before power generation is suppressed is the same as the values shown in FIG. 19 . In FIGS. 19 and 29, the first section, second section, and third section may mean the first section, second section, and third section that are multiple sections of the distribution line 46-1 in FIG. 27. .

In the examples shown in FIGS. 19 and 29, before power generation is suppressed, the power output to the distribution line 46-1 in the first section is 10KW, the power output to the distribution line 46-1 in the second section is 30KW, In the third section, the power output to the power distribution line 46-1 is 20 KW. On the other hand, in the example shown in FIG. 29, the suppression coefficient is calculated to be 0.7 based on the power generation suppression information. Therefore, in the example shown in FIG. 29, a value obtained by multiplying the measured value of the generated power before suppression by a suppression coefficient of 0.7 is calculated as the power output to the distribution line 46-1 after the generation is suppressed.

After power generation is suppressed, the power output from the distributed power sources 50-1, 50-2, and 50-3 to the distribution line 46-1 is suppressed, so in the example shown in FIG. The power output to the distribution line 46-1 is 7KW, the power output to the distribution line 46-1 in the second section is 21KW, and the power output to the distribution line 46-1 in the third section is 14KW. The electric power after power generation suppression differs depending on the power generation suppression information. The calculation unit 208 may calculate the power value after power generation is suppressed based on the power generation suppression information. In the examples shown in FIGS. 19 and 29, the load does not change before and after power suppression.

FIG. 30 is a flowchart illustrating an example of processing of the power distribution control device in a modification of the second embodiment. The processing from step S51 to step S53 is similar to the processing from step S41 to step S43 in FIG. 22. Therefore, repeated explanation will be omitted.

The control information acquisition unit 113 acquires control information from the command device 500 (step S54). The control information is information used to limit the output of the distributed power source 50 connected to each of the first distribution lines 16-1 and 16-2 or each of the second distribution lines 26-1 and 26-2. In this example, the control information includes power generation suppression information that causes the distributed power source 50 to suppress the generated power.

The calculation unit 208 multiplies the power of each distributed power source 50 obtained from the actual power generation information acquired by the power generation information acquisition unit 206 by the suppression coefficient obtained according to the power generation suppression information. Recalculate (correction calculation) the generated power and load in multiple sections (first section, second section, and third section in Fig. 9) within the distribution line (distribution lines 46-1 and 26-2 in Fig. 9). (Step S55).

Note that the power distribution control device 200 in the modified example of the second embodiment may use the process shown in FIG. 30 to execute the process of connecting the plurality of power distribution lines shown in FIGS. 23 and 24. Further, the power distribution control device 200 may execute the process of selecting another power distribution line shown in FIG. 25.

According to the power distribution control device 200 of the modified example of the second embodiment, accurate generated power and load can be estimated by reflecting the power generation suppression command in the distributed power supply output. Therefore, the accuracy of assuming the voltage and current of the power distribution system can be improved. In addition, in 2nd Embodiment, the case where the determination of the propriety of connection between adjacent distribution lines was performed by accurate estimation of generated electric power and estimation of load was illustrated. However, it is clear that the process of increasing the accuracy of power generation power estimation and load estimation by acquiring control information from the host system can improve the accuracy of all processes that perform power flow calculations, etc. .

Although the present invention has been described above using the embodiments, the technical scope of the present invention is not limited to the range described in the above embodiments. It will be apparent to those skilled in the art that various changes or improvements can be made to the embodiments described above. It is clear from the claims that such modifications or improvements may be included within the technical scope of the present invention.

The order of execution of each process, such as the operation, procedure, step, and stage in the apparatus, system, program, and method shown in the claims, specification, and drawings, is specifically defined as "before" or "before". It should be noted that they can be implemented in any order unless the output of the previous process is used in the subsequent process. Even if the claims, specifications, and operational flows in the drawings are explained using "first,""next," etc. for convenience, this does not mean that it is essential to carry out the operations in this order. It's not a thing.
[Item 1]
a congestion degree acquisition unit that acquires information regarding the congestion degree of each of the plurality of power transmission lines;
The distributed power source is electrically connected by controlling at least one switch capable of electrically connecting the distributed power source to any of the plurality of power transmission lines via a transformer equipment based on the congestion degree. a control unit that switches the power transmission line,
Power distribution control equipment.
[Item 2]
The congestion degree acquisition unit acquires information regarding the congestion degree of the first power transmission line and information regarding the congestion degree of the second power transmission line,
The control unit is configured to control one of the one or more distributed power sources electrically connected to the first power transmission line when the congestion degree of the first power transmission line is higher than the congestion degree of the second power transmission line. controlling the switch so that at least a portion thereof is electrically connected to the second power transmission line;
The power distribution control device according to item 1.
[Item 3]
The congestion degree acquisition unit acquires information regarding the congestion degree of the first power transmission line and information regarding the congestion degree of the second power transmission line,
The control unit is configured to control the first power transmission line when the congestion degree of the first power transmission line is higher than the congestion degree of the second power transmission line, and the congestion degree of the first power transmission line is higher than a predetermined first threshold value. controlling the switch so that at least some of the one or more distributed power sources electrically connected to one power transmission line are electrically connected to the second power transmission line;
The power distribution control device according to item 1.
[Item 4]
The control unit selects one or more of the distributed power sources electrically connected to the first power transmission line, based on the congestion degree of the first power transmission line and the congestion degree of the second power transmission line. determining the number or type of distributed power sources that are switched to be electrically connected to the second power transmission line;
The power distribution control device according to item 2 or 3.
[Item 5]
A first power distribution system is electrically connected to the first power transmission line via a first transformer equipment,
A second power distribution system is electrically connected to the second power transmission line via a second transformer equipment,
The distributed power source is connectable to the first power distribution system via at least one first switch, and also connectable to the second power distribution system via at least one second switch. Contains a distributed power source that is subject to connection switching,
The control unit controls the connection switching target when the congestion degree of the first power transmission line is higher than the congestion degree of the second power transmission line, and the congestion degree of the first power transmission line is higher than a predetermined first threshold value. switching off at least one of the first switches to electrically disconnect at least a portion of the distributed power source from the first power distribution system, and electrically connecting to the second power distribution system; switching the second switch on so that
The power distribution control device according to any one of items 2 to 4.
[Item 6]
The control unit is configured to previously set the degree of congestion of the first power transmission line to a value equal to or less than the first threshold after switching off at least one of the first switches and switching on the second switch. The power distribution control device according to item 5, which turns the first switch back on and turns off at least one of the second switches when the voltage falls below a predetermined second threshold.
[Item 7]
The first power distribution system includes one or more first power distribution lines electrically connected to the first transformer equipment,
The second power distribution system includes one or more second power distribution lines electrically connected to the second transformer equipment,
In a state where at least one of the first switches is switched off and the second switch is switched on,
Based on the electrical measurement results at multiple points within the first distribution line, the loads in multiple sections within the first distribution line and the generated power of the distributed power source are calculated; further comprising a calculation unit that calculates the load in a plurality of sections in the second distribution line and the generated power of the distributed power source based on the electrical measurement results of
The power distribution control device according to item 5 or 6.
[Item 8]
further comprising a control information acquisition unit that acquires control information used to limit the output of the distributed power source connected to each first distribution line or each second distribution line,
The calculation unit calculates the load in the plurality of sections in each first distribution line and the plurality of sections in each second distribution line and the distributed power source based on the control information and the electrical measurement result. Calculate the generated power,
The power distribution control device according to item 7.
[Item 9]
The degree of congestion of the power transmission line is the ratio of actual power flow to the power transmission capacity indicating the power that can be transmitted by the power transmission line, or the power generation rate that causes the distributed power source connected to the power transmission line to suppress the generated power. The power distribution control device according to any one of items 1 to 8, including suppression information.
[Item 10]
The power distribution control device according to any one of items 1 to 9;
a terminal device communicably connected to the power distribution control device;
system.
[Item 11]
a control information acquisition unit that acquires control information used to limit the output of a distributed power source connected to at least one distribution line connected to the power transmission line via a transformer;
a measurement result acquisition unit that acquires electrical measurement results at multiple points within the distribution line;
A power distribution control device comprising: a calculation unit that calculates loads in a plurality of sections in a distribution line and power generated by the distributed power source based on the control information and the electrical measurement results.
[Item 12]
The power distribution control device according to item 11, wherein the control information includes failure information of the power transmission line.
[Item 13]
The power distribution control device according to item 11, wherein the control information includes power generation suppression information that causes the distributed power source to suppress generated power.
[Item 14]
The measurement result acquisition unit acquires measurement results of current, voltage, and power factor at multiple points within the distribution line,
The calculation unit is based on the measurement results of the current, the voltage, and the power factor within the area of the distribution line, and the state of the distributed power source on the distribution line obtained from the control information. , calculating the generated power of the load and the distributed power source in the plurality of sections in the distribution line;
The power distribution control device according to any one of items 11 to 13.
[Item 15]
The one or more distribution lines include one distribution line and another distribution line,
The measurement result acquisition unit acquires electrical measurement results at multiple points within the one distribution line and at multiple points within the other distribution line,
The calculation unit calculates the generated power of the load and the distributed power source in multiple sections of the one distribution line and multiple sections of the other distribution line based on the control information and the electrical measurement results. Calculate,
The power distribution control device determines whether connection is possible between the one distribution line and the other distribution line based on the load calculated by the calculation unit and the generated power of the distributed power source. further comprising a determination unit that
The power distribution control device according to any one of items 11 to 14.
[Item 16]
The calculation unit calculates the generated power of the load and the distributed power source in multiple sections of the one distribution line and multiple sections of the other distribution line when a failure occurs in the one distribution line. Calculate,
The determination unit determines whether connection is possible between the one distribution line and the other distribution line when a failure occurs in the one distribution line.
The power distribution control device according to item 15.
[Item 17]
further comprising a storage unit that stores the calculation result calculated by the calculation unit,
The calculation unit calculates the load of the load and the distributed power source in the plurality of sections in the one distribution line and the plurality of sections in the other distribution line, regardless of whether a failure has occurred in the one distribution line. Calculating the generated power,
The determination unit determines whether connection is possible between the one distribution line and the other distribution line based on the calculation result stored in the storage unit when a failure occurs in the one distribution line. determine whether or not
The power distribution control device according to item 15.
[Item 18]
The control information includes failure information of the power transmission line,
The other distribution line to which the one distribution line is connected is selected from among the plurality of distribution lines based on the failure information of the transmission line.
The power distribution control device according to any one of items 15 to 17.
[Item 19]
The power distribution control device according to any one of items 11 to 18, wherein the control information acquisition unit acquires the control information through a communication line from a command device that transmits a control command to the distributed power source.
[Item 20]
The power distribution control device according to any one of items 1 to 9;
a terminal device communicably connected to the power distribution control device;
system.

1. Distribution automation system, 4. Substation, 5. Distribution automation system, 10. Power transmission line, 11. Measuring instrument, 12. 1st transformer equipment, 13. 1st distribution system, 14. - Feeder breaker, 16... Distribution line, 20... Transmission line, 21... Measuring instrument, 22... Second transformer equipment, 23... Second distribution system, 24... Feeder breaker, 26... Distribution Electric wire, 28...Measuring instrument, 30...Distributed power source, 32...Switch, 36...Load, 40...Transmission line, 42...Transformer equipment, 44...Feeder circuit breaker, 46...Distribution line , 48... Measuring device, 50... Distributed power source, 52... Switch, 56... Load, 100... Power distribution control device, 101... Terminal device, 102... Congestion degree acquisition unit, 104... Control 106... Storage unit, 108... Power generation information acquisition unit, 110... Calculation unit, 112... Measurement result acquisition unit, 113... Control information acquisition unit, 114... Power generation suppression change instruction unit, 116... Communication unit, 117... Judgment unit, 200... Power distribution control device, 201... Terminal device, 202... Control information acquisition unit, 204... Measurement result acquisition unit, 206... Power generation information acquisition unit, 208... Calculation Part, 210... Judgment part, 212... Storage part, 213... Control part, 214... Communication part, 400... Power system, 402... Main power transmission system, 403... Interconnection line, 412... Thermal power Power plant, 413...Hydroelectric power plant, 414...Pumped storage power plant, 415...Power supply, 424...Pumped storage power plant, 426...Solar power generation equipment, 428...Wind power generation equipment, 500...Command device, 502...Central power supply command device, 506...Relay device, 507...Measuring instrument

Claims (19)

a congestion degree acquisition unit that acquires information regarding the congestion degree of each of the plurality of power transmission lines;
The distributed power source is electrically connected by controlling at least one switch capable of electrically connecting the distributed power source to any of the plurality of power transmission lines via a transformer equipment based on the congestion degree. a control unit that switches the power transmission line ,
The congestion degree acquisition unit acquires information regarding the congestion degree of the first power transmission line and information regarding the congestion degree of the second power transmission line,
The control unit is configured to control one of the one or more distributed power sources electrically connected to the first power transmission line when the congestion degree of the first power transmission line is higher than the congestion degree of the second power transmission line. controlling the switch so that at least a portion thereof is electrically connected to the second power transmission line;
Power distribution control equipment. a congestion degree acquisition unit that acquires information regarding the congestion degree of the first power transmission line and information regarding the congestion degree of the second power transmission line;
Controlling at least one switch capable of electrically connecting a distributed power source to either the first power transmission line or the second power transmission line via a transformer equipment based on the congestion degree, a control unit that switches the power transmission line to which the is electrically connected;
Equipped with
The control unit is configured to control the first power transmission line when the congestion degree of the first power transmission line is higher than the congestion degree of the second power transmission line, and the congestion degree of the first power transmission line is higher than a predetermined first threshold value. controlling the switch so that at least some of the one or more distributed power sources electrically connected to one power transmission line are electrically connected to the second power transmission line;
Power distribution control equipment. The control unit selects one or more of the distributed power sources electrically connected to the first power transmission line, based on the congestion degree of the first power transmission line and the congestion degree of the second power transmission line. determining the number or type of distributed power sources that are switched to be electrically connected to the second power transmission line;
The power distribution control device according to claim 1 or 2 . A first power distribution system is electrically connected to the first power transmission line via a first transformer equipment,
A second power distribution system is electrically connected to the second power transmission line via a second transformer equipment,
The distributed power source is connectable to the first power distribution system via at least one first switch, and also connectable to the second power distribution system via at least one second switch. Contains a distributed power source that is subject to connection switching,
The control unit controls the connection switching target when the congestion degree of the first power transmission line is higher than the congestion degree of the second power transmission line, and the congestion degree of the first power transmission line is higher than a predetermined first threshold value. switching off at least one of the first switches to electrically disconnect at least a portion of the distributed power source from the first power distribution system, and electrically connecting to the second power distribution system; switching the second switch on so that
The power distribution control device according to any one of claims 1 to 3 . The control unit is configured to previously set the degree of congestion of the first power transmission line to a value equal to or less than the first threshold after switching off at least one of the first switches and switching on the second switch. If the value falls below a predetermined second threshold, the first switch is turned back on, and at least one of the second switches is turned off.
The power distribution control device according to claim 4 . The first power distribution system includes one or more first power distribution lines electrically connected to the first transformer equipment,
The second power distribution system includes one or more second power distribution lines electrically connected to the second transformer equipment,
In a state where at least one of the first switches is switched off and the second switch is switched on,
Based on the electrical measurement results at multiple points within the first distribution line, the loads in multiple sections within the first distribution line and the generated power of the distributed power source are calculated; further comprising a calculation unit that calculates the load in a plurality of sections in the second distribution line and the generated power of the distributed power source based on the electrical measurement results of
The power distribution control device according to claim 4 or 5 . further comprising a control information acquisition unit that acquires control information used to limit the output of the distributed power source connected to each first distribution line or each second distribution line,
The calculation unit calculates the load in the plurality of sections in each first distribution line and the plurality of sections in each second distribution line and the distributed power source based on the control information and the electrical measurement result. Calculate the generated power,
The power distribution control device according to claim 6 . The degree of congestion of the power transmission line is the ratio of actual power flow to the power transmission capacity indicating the power that can be transmitted by the power transmission line, or the power generation rate that causes the distributed power source connected to the power transmission line to suppress the generated power. Contains suppression information,
The power distribution control device according to any one of claims 1 to 7 . The power distribution control device according to any one of claims 1 to 8 ,
a terminal device communicably connected to the power distribution control device;
system. a control information acquisition unit that acquires control information used to limit the output of a distributed power source connected to at least one distribution line connected to the power transmission line via a transformer;
a measurement result acquisition unit that acquires electrical measurement results at multiple points within the distribution line;
a calculation unit that calculates the load in multiple sections in the distribution line and the generated power of the distributed power source based on the control information and the electrical measurement results ,
The control information includes failure information of the power transmission line.
Power distribution control equipment. a control information acquisition unit that acquires control information used to limit the output of a distributed power source connected to at least one distribution line connected to the power transmission line via a transformer;
a measurement result acquisition unit that acquires electrical measurement results at multiple points within the distribution line;
a calculation unit that calculates loads in multiple sections within the distribution line and power generated by the distributed power source based on the control information and the electrical measurement results;
Equipped with
The control information includes power generation suppression information that causes the distributed power source to suppress generated power.
Power distribution control equipment. a control information acquisition unit that acquires control information used to limit the output of a distributed power source connected to at least one distribution line connected to the power transmission line via a transformer;
a measurement result acquisition unit that acquires electrical measurement results at multiple points within the distribution line;
a calculation unit that calculates loads in multiple sections within the distribution line and power generated by the distributed power source based on the control information and the electrical measurement results;
Equipped with
The control information acquisition unit acquires the control information from a command device that transmits a control command to the distributed power source through a communication line.
Power distribution control equipment. The measurement result acquisition unit acquires measurement results of current, voltage, and power factor at multiple points in the distribution line,
The calculation unit is based on the measurement results of the current, the voltage, and the power factor within the area of the distribution line, and the state of the distributed power source on the distribution line obtained from the control information. , calculating the generated power of the load and the distributed power source in the plurality of sections in the distribution line;
The power distribution control device according to any one of claims 10 to 12 . a control information acquisition unit that acquires control information used to limit the output of a distributed power source connected to one distribution line and another distribution line connected to the power transmission line via a transformer equipment;
a measurement result acquisition unit that acquires electrical measurement results at multiple points within the one power distribution line and at multiple points within the other power distribution line;
a calculation unit that calculates loads and generated power of the distributed power source in multiple sections within the one distribution line and multiple sections within the other distribution line, based on the control information and the electrical measurement results;
a determination unit that determines whether connection is possible between the one distribution line and the other distribution line based on the load calculated by the calculation unit and the generated power of the distributed power source ;
Equipped with
The control information includes failure information of the power transmission line,
The other distribution line to which the one distribution line is connected is selected from among the plurality of distribution lines based on the failure information of the transmission line.
Power distribution control equipment. The calculation unit calculates the generated power of the load and the distributed power source in multiple sections of the one distribution line and multiple sections of the other distribution line when a failure occurs in the one distribution line. Calculate,
The determination unit determines whether connection is possible between the one distribution line and the other distribution line when a failure occurs in the one distribution line.
The power distribution control device according to claim 14 . The calculation unit calculates the load and the distributed power source in multiple sections within the one distribution line and multiple sections within the other distribution line, regardless of whether a failure has occurred in the one distribution line. Calculate the generated power of
The determination unit determines whether connection is possible between the one distribution line and the other distribution line based on the calculation result calculated by the calculation unit when a failure occurs in the one distribution line. to judge about
The power distribution control device according to claim 14 . The power distribution control device according to claim 16, further comprising a storage unit that stores the calculation result calculated by the calculation unit. The control information acquisition unit acquires the control information from a command device that transmits a control command to the distributed power source through a communication line.
The power distribution control device according to any one of claims 14 to 17 . The power distribution control device according to any one of claims 10 to 18 ,
a terminal device communicably connected to the power distribution control device;
system.

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