JP5960188B2 - Distributed power output prediction system - Google Patents

Description

  The present invention relates to a distributed power output prediction system.

  2. Description of the Related Art Distribution automation systems are known for accommodating current between adjacent distribution lines when an accident occurs in a distribution system. Patent Document 1 discloses a method of operating a distribution system linked to a distributed power source including means for detecting a reverse power flow from a distributed power source, and means for detecting a distribution line load from the detected reverse power flow and a distribution line drawing current. Is described. As a result, it is described that since an optimum distribution amount can be calculated by obtaining a correct distribution line load, it is possible to realize load accommodation that does not cause overload at the time of accident recovery.

JP 2003-189472 A

  When an accident such as a ground fault occurs in the distribution system, the circuit breaker of the distribution line including the accident section is interrupted. After that, when the accident section is specified by reclosing, the switch on the substation side in the accident section is cut off, so that no current is supplied to the section on the terminal side of the accident section, resulting in a power outage section. Therefore, the power distribution system is configured such that current can be accommodated from the adjacent distribution lines by connecting a section located at the end of a certain distribution line to the adjacent distribution lines. A switch is provided at a connection point between adjacent distribution lines. The switch is normally opened, and the switch is turned on when current interchange is required due to an accident. As a result, current is supplied to the end section of the accident section until the accident is recovered. However, there is a limit to the current that can be accommodated by the distribution line (sound distribution line) that accommodates the current when an accident occurs. When the limit is exceeded, the breaker of the sound distribution line trips.

  On the other hand, in recent years, power generation facilities using natural energy such as solar power generation facilities or wind power generation facilities have been widely used. These power generation facilities are connected to the distribution system as a distributed power source. In the section where the distributed power source is connected, the current from the distributed power source covers a part of the load in the section. For this reason, in the section where the distributed power source is connected, the current passing through the distribution line (apparent load) is smaller than the current actually consumed (actual load). When an accident occurs in the distribution line to which the distributed power source is connected, the distributed power source is automatically disconnected from the distribution line in order to prevent a single operation of the distributed power source. For this reason, if current is accommodated from the sound distribution line based on the apparent load before the accident occurs, an excessive current may flow through the sound distribution line, and the breaker of the sound distribution line may trip. In order to supply a stable current to the consumer, it is desirable to suppress the possibility that the circuit breaker will trip as much as possible. Furthermore, it is desirable that the power outage section be reduced by receiving power interchange from the healthy distribution line as soon as possible.

  The present invention has been made in view of the above, and a distributed power output prediction system capable of suppressing the possibility of tripping of a breaker of a healthy distribution line and quickly reducing the range of a power outage section. The purpose is to provide.

In order to solve the above-described problems and achieve the object, the distributed power output prediction system according to the present invention includes a first distribution line and a substation side of each of the second distribution lines connected to the first distribution line. A circuit breaker provided at an end of the first distribution line, a plurality of switches for dividing the first distribution line and the second distribution line into a plurality of sections, and a dispersion connected to the first distribution line or the second distribution line The distribution automation control device includes a breaker current value storage unit that stores a current value that passes through the circuit breaker, and stores a current value that passes through the switch. The switch current value storage unit, the connection relation information between the plurality of sections, the switch information of the plurality of circuit breakers and the plurality of switches, the power recovery time information of the distributed power source, and the circuit breaker System configuration storage unit for storing allowable passing current information, When an accident occurs in the distributed power source information storage unit for storing information on the distributed power source and the first distribution line, an accident section is selected from the plurality of sections based on the connection relation information and the switching information. Identifying a power outage section identifying unit that identifies each of the plurality of sections located on the terminal side of the accident section as a power outage section, based on the information on the distributed power source, before the occurrence of the accident Based on the distributed power output estimation unit that calculates the output of the distributed power source linked to the power outage section for each power outage section, the connection relation information and the current value passing through the switch, Based on the apparent load calculation unit for each section that calculates the apparent load that is the passing current of the power outage section before the occurrence of the accident for each power outage section, the output of the distributed power source and the apparent load, The actual load that is the current actually consumed in the power failure section before the occurrence of the failure, the actual load estimation unit for each section that calculates for each power failure section, the current value that passes through the circuit breaker, and the connection relation information , Based on the switching information and the allowable passing current information, and the actual load, an interchangeable range determination unit that identifies a first interchangeable range that is a range of a power failure period in which the second distribution line can accommodate current; The accommodable range determination unit specifies that the distributed power source in the first accommodable range is connected based on the power recovery time information, and a current value passing through the circuit breaker, A second interchangeable range wider than the first interchangeable range is specified based on connection relation information, the switching information, the allowable passing current information, and the actual load.

  Thereby, since the distributed power output prediction system according to the present invention can perform current accommodation based on the actual load, the possibility of tripping the breaker of the sound distribution line can be suppressed. In addition, the distributed power output prediction system according to the present invention can identify that the distributed power source disconnected when the accident occurs is connected again based on the power recovery time of the distributed power source. The possible range can be expanded more quickly. Therefore, the distributed power output prediction system according to the present invention can suppress the possibility that the breaker of the sound distribution line will trip and can quickly reduce the range of the power failure section.

  As a desirable aspect of the present invention, the distribution automation control device includes a weather prediction information storage unit that stores weather prediction information, and the distributed power source information storage unit stores position information of the distributed power source. A position storage unit, a distributed power supply characteristic storage unit that stores output characteristic information of the distributed power supply, and a distributed power supply interconnection section storage unit that stores connection section information of the distributed power supply, The distributed power output estimation unit calculates the output of the distributed power for each power outage section based on the weather forecast information, the position information, the output characteristic information, and the interconnection section information. It is preferable to do.

  As a result, the distributed power output estimation unit can calculate the output of the distributed power without providing a measuring device for measuring the output of the distributed power. For this reason, the power distribution automation control device can easily calculate the actual load which is an added value of the apparent load and the output of the distributed power source.

  ADVANTAGE OF THE INVENTION According to this invention, the distributed power output prediction system which can suppress the possibility that the circuit breaker of a healthy distribution line trips and can shorten the range of a power failure area quickly can be provided.

FIG. 1 is a schematic diagram for explaining a distributed power output prediction system according to the present embodiment. FIG. 2 is a schematic diagram illustrating a configuration for realizing the distribution automation control device according to the present embodiment. FIG. 3 is a schematic diagram for explaining the distributed power output estimation unit according to the present embodiment. FIG. 4 is a schematic diagram showing a part of the power distribution system in a normal state. FIG. 5 is a schematic diagram showing a part of the distribution system immediately after an accident occurs in the first distribution line. FIG. 6 is a schematic diagram showing a part of the power distribution system after the accident section is specified. FIG. 7 is a schematic diagram illustrating an example of a state of the power distribution system after current interchange from the second distribution line to the first distribution line is performed. FIG. 8 is a schematic diagram illustrating an example of a state of the power distribution system after current interchange from the second distribution line to the first distribution line is performed. FIG. 9 is a flowchart illustrating a method for accommodating current using the distributed power output prediction system according to the present embodiment.

  Hereinafter, the present invention will be described in detail with reference to the drawings. The present invention is not limited by the following modes for carrying out the invention (hereinafter referred to as embodiments). In addition, constituent elements in the following embodiments include those that can be easily assumed by those skilled in the art, those that are substantially the same, and those in a so-called equivalent range. Furthermore, the constituent elements disclosed in the following embodiments can be appropriately combined.

(Embodiment)
FIG. 1 is a schematic diagram for explaining a distributed power output prediction system according to the present embodiment. FIG. 2 is a schematic diagram illustrating a configuration for realizing the distribution automation control device according to the present embodiment. FIG. 3 is a schematic diagram for explaining the distributed power output estimation unit according to the present embodiment. As shown in FIG. 1, the distributed power output prediction system 200 according to this embodiment includes a distribution automation control device 100 that controls the switch N. A distributed power output estimation unit 10 and a power distribution control unit 20 are provided. When an accident occurs in the distribution system, the distributed power output prediction system 200 appropriately accommodates current from a distribution line (second distribution line) different from the distribution line (first distribution line) where the accident occurred. It is a system for controlling. In the following description, a distribution line in which an accident occurs is described as a first distribution line, and a distribution line that accommodates current in the first distribution line is described as a second distribution line.

  As shown in FIG. 2, the distribution automation control apparatus 100 includes an input interface 100a, an output interface 100b, a CPU (Central Processing Unit) 100c, a ROM (Read Only Memory) 100d, and a RAM (Random Access Memory) 100e. And an internal storage device 100f. FIG. 1 shows a distribution automation control device 100 using functional blocks. Each function of the distribution automation control device 100 is realized by combining, for example, the input interface 100a, the output interface 100b, the CPU 100c, the ROM 100d, the RAM 100e, and the internal storage device 100f shown in FIG.

  As shown in FIG. 1, the distributed power output estimation unit 10 includes, for example, a distributed power source weather estimation unit 11, a distributed power source output estimation unit 12, a section output estimation unit 13, and distributed power source information. A storage unit 17. The distributed power output estimation unit 10 calculates the output of the distributed power provided in the distribution system. The distributed power output estimation unit 10 acquires information from the distributed power management system 5 that manages various types of information on the distributed power provided in the distribution system, and stores the information in the distributed power information storage unit 17. In the present embodiment, the distributed power source indicates a facility using natural energy such as a solar power generation facility or a wind power generation facility linked to a distribution system.

  The distributed power supply information storage unit 17 includes a distributed power supply location storage unit 14, a distributed power supply characteristic storage unit 15, and a distributed power supply interconnection section storage unit 16. The distributed power supply position storage unit 14 stores position information of each distributed power supply. The position information is, for example, the latitude and longitude where each distributed power source is arranged. The distributed power supply characteristic storage unit 15 stores output characteristic information of each distributed power supply. The output characteristic information is, for example, a correlation between the amount of solar radiation and output in a solar power generation facility, and is a correlation between wind speed and output in, for example, a wind power generation facility. The distributed power supply interconnection section storage unit 16 stores interconnection section information of each distributed power supply. The interconnected section information is, for example, information on a section in which each distributed power source is interconnected.

  The distributed power output estimation unit 10 includes a weather prediction information storage unit 18. The distributed power output estimation unit 10 acquires weather prediction information from the weather prediction system 4 and stores it in the weather prediction information storage unit 18. The weather prediction system 4 calculates a value such as the solar radiation amount or the wind speed for every 5 km mesh based on the weather observation information 3 and outputs it as weather prediction information. The weather observation information 3 is information such as weather forecast information or weather satellite images, for example. Note that the weather prediction information does not necessarily have to be data that predicts the weather every 5 km mesh.

  The distributed power source weather estimation unit 11 determines the position of each distributed power source based on the position information stored in the distributed power source position storage unit 14 and the weather prediction information stored in the weather prediction information storage unit 18. Calculate weather information at. The meteorological estimation unit 11 for each distributed power source identifies the longitude and latitude at which each distributed power source is arranged from the position information of each distributed power source, and associates the longitude and latitude with the mesh in the weather prediction information. Thereby, the distributed power-source weather estimation unit 11 specifies a mesh in the weather prediction information to which the point indicated by the specified longitude and latitude belongs. Then, the distributed power source-specific weather estimation unit 11 can calculate the weather information at the position of each distributed power source as the weather information in the identified mesh.

  Based on the weather information for each distributed power source acquired from the distributed power source weather estimation unit 11 and the output characteristic information stored in the distributed power source characteristic storage unit 15, the distributed power source output estimating unit 12 Calculate the output of each distributed power source. The distributed power source output estimation unit 12 inputs the weather information at the position of each distributed power source acquired from the distributed power source weather estimation unit 11 to the output characteristic information of each distributed power source. Thereby, the output estimation part 12 for every distributed power supply can calculate the output of each distributed power supply.

  The section-by-section output estimator 13 is based on the output of each distributed power source acquired from the distributed power source-specific output estimator 12 and the interconnected section information stored in the distributed power supply interconnected section storage unit 16. The distributed power output for each section divided by the switch N is calculated. The section-by-section output estimation unit 13 calculates an added value of the outputs of the distributed power sources belonging to the same section. Thereby, the output estimation part 13 for every area can calculate the distributed power output for every area.

  FIG. 3 shows an example of an arrangement of a distribution system that is a calculation target of the distributed power output by the distributed power output estimation unit 10. In FIG. 3, the rectangles separated by broken lines indicate a 5 km mesh in the weather forecast information. The distribution system includes two distribution lines f1 and f2 connected to the substation ss. The distribution line f1 is divided into sections z1, z2, z3, and z4 by switches n1, n2, and n3. A distributed power source g1 is linked to the section z2. Distributed power sources g2 and g3 are linked to the section z3. For example, the distributed power sources g1, g2, and g3 are solar power generation facilities. The distributed power source g1 is arranged in the mesh m1. The distributed power source g2 is arranged in the mesh m2. The distributed power source g3 is arranged in the mesh m3.

  The function of the meteorological estimation unit 11 for each distributed power source will be described as follows using the power distribution system shown in FIG. 3 as an example. The distributed power source-based weather estimation unit 11 identifies the latitude and longitude in which the distributed power sources g1, g2, and g3 are arranged from the position information, and associates the latitude and longitude with the mesh in the weather prediction information. Thereby, it is specified that the distributed power source g1 belongs to the mesh m1 in the weather prediction information, the distributed power source g2 belongs to the mesh m2 in the weather prediction information, and the distributed power source g3 belongs to the mesh m3 in the weather prediction information. For this reason, the distributed power source-specific weather estimation unit 11 can calculate the solar radiation amount at each point of the distributed power sources g1, g2, and g3 as the solar radiation amount in the specified mesh.

  The function of the distributed power source output estimator 12 is explained as follows when the distribution system shown in FIG. 3 is used as an example. The distributed power source output estimation unit 12 inputs the amount of solar radiation at the position of each distributed power source acquired from the distributed power source weather estimation unit 11 to the output characteristic information of each of the distributed power sources g1, g2, and g3. The output characteristic information is a correlation between the amount of solar radiation and the output regarding each of the distributed power sources g1, g2, and g3. Thereby, the output estimation part 12 for every distributed power supply can calculate each output of the distributed power supplies g1, g2, and g3.

  The function of the section-by-section output estimation unit 13 is described as follows when the distribution system shown in FIG. 3 is used as an example. The section-by-section output estimation unit 13 specifies from the connection section information that the distributed power source g1 is connected to the section z2, and the distributed power sources g2 and g3 are connected to the section z3. To do. The section-by-section output estimation unit 13 calculates the total value of the outputs of the distributed power sources belonging to the same section. That is, the section-by-section output estimation unit 13 obtains the distributed power output of the section z2 as the output of the distributed power supply g1, and sets the distributed power output of the section z3 as the total value of the outputs of the distributed power supply g2 and the distributed power supply g3. calculate. Further, the section-by-section output estimation unit 13 calculates the distributed power output of the sections z1 and z4 as zero. Thereby, the section-by-section output estimation unit 13 can calculate the distributed power output of each of the sections z1, z2, z3, and z4.

  As shown in FIG. 1, the power distribution control unit 20 includes, for example, a section-by-section actual load estimation unit 21, a compatible range determination unit 22, a power outage section identification unit 23, a section-by-section apparent load calculation unit 24, and a circuit breaker. A current value storage unit 25, a switch current value storage unit 26, and a system configuration storage unit 27 are provided. The power distribution control unit 20 controls opening (off) and closing (on) of the circuit breaker CB and the switch N arranged in the power distribution system. The circuit breaker CB and the switch N are provided with sensors that can measure the current value passing therethrough. The power distribution control unit 20 acquires a current value passing through the circuit breaker CB every predetermined time and stores the current value in the circuit breaker current value storage unit 25. The power distribution control unit 20 acquires the current value passing through the switch N every predetermined time, and stores it in the switch current value storage unit 26.

  The system configuration storage unit 27 includes connection relation information that is information on connection relations between a plurality of sections divided by the circuit breaker CB and the switch N, and information on the state of opening and closing of the circuit breaker CB and the switch N. Certain switching information, allowable passing current information that is the maximum current value that can pass through the circuit breaker CB, and power recovery time information that is information on power recovery time of the distributed power source are stored in the system configuration storage unit 27. Yes. The power recovery time is the time from when the current is supplied in a state where the distributed power source is disconnected until the distributed power source is automatically reconnected. For example, in this embodiment, the power recovery times of all the distributed power sources are equal, and the power recovery time is 3 minutes. For example, the power distribution control unit 20 acquires switching information from the circuit breaker CB and the switch N every predetermined time, and stores the switching information in the system configuration storage unit 27. For example, the connection relation information and the allowable passing current information are stored in advance in the system configuration storage unit 27. For example, the power distribution control unit 20 acquires power recovery time information from the distributed power management system 5 every predetermined time and stores the power recovery time information in the system configuration storage unit 27. Note that the distributed power supply does not necessarily need to be automatically reconnected after the power recovery time. For example, the distributed power supply may be connected after the command operation. When the distributed power supply is linked by command operation, for example, if the system configuration storage unit 27 acquires the input information of the command operation from the distributed power management system 5 and stores that the distributed power supply is linked. Good.

  FIG. 4 is a schematic diagram showing a part of the power distribution system in a normal state. FIG. 5 is a schematic diagram showing a part of the distribution system immediately after an accident occurs in the first distribution line. FIG. 6 is a schematic diagram showing a part of the power distribution system after the accident section is specified. FIG. 7 is a schematic diagram illustrating an example of a state of the power distribution system after current interchange from the second distribution line to the first distribution line is performed. FIG. 8 is a schematic diagram illustrating an example of a state of the power distribution system after current interchange from the second distribution line to the first distribution line is performed.

  The distribution system shown in FIGS. 4 to 8 includes a first distribution line F1 and a second distribution line F2 connected to the substation SS. The substation SS includes a transformer TF that drops the voltage of electricity sent from the power plant, and circuit breakers CB1 and CB2. Circuit breakers CB1 and CB2 are circuit breakers CB shown in FIG. The circuit breaker CB1 is provided at the end of the first distribution line F1 on the substation SS side. The first distribution line F1 is connected to the transformer TF via the circuit breaker CB1. The first distribution line F1 is divided into sections Z1, Z2, Z3, and Z4 by a circuit breaker CB1 and switches N1, N2, and N3. A distributed power source G1 is linked to the section Z3, and a distributed power source G2 is linked to the section Z4. For example, the distributed power sources G1 and G2 are solar power generation facilities. Moreover, the circuit breaker CB2 is provided in the edge part by the side of the substation SS of the 2nd distribution line F2. The second distribution line F2 is connected to the transformer TF via the circuit breaker CB2. The second distribution line F2 is divided into sections Z5, Z6, Z7, and Z8 by the circuit breaker CB2 and the switches N5, N6, and N7. A distributed power source is not provided in the second distribution line F2. Moreover, the 1st distribution line F1 is connected to the terminal of the 2nd distribution line F2 via the switch N4 arrange | positioned at the terminal. In normal times, the switch N4 is opened as shown in FIG. The switches N1 to N7 are the switches N shown in FIG. The terminal side of a specific section means the direction opposite to the circuit breaker CB when viewed from the specific section, and will be described with the same meaning in the following. In addition, the normal time means a state in which current is supplied to all sections in the distribution system, and the same meaning is described below.

  As shown in FIG. 5, for example, when an accident occurs in the section Z2 in the first distribution line F1, after the circuit breaker CB1 is opened, reclosing is performed by the relay provided in the substation SS. Then, the relay specifies that the accident section is the section Z2 by counting the time until the circuit breaker CB1 trips. Thereafter, the relay causes the switches N1 to N3 to be kept open so that the current passing through the circuit breaker CB1 does not reach the end side of the section Z2. Thereby, a power distribution system will be in the state shown in FIG.

  When an accident occurs in the first distribution line F1, the power failure section specifying unit 23 selects an accident section from among the plurality of sections Z1 to Z4 based on the connection relation information and the opening / closing information stored in the system configuration storage unit 27. Identify. For example, the accident section is a section Z2 as shown in FIG. And the power failure area specific | specification part 23 specifies the area located in the terminal side rather than the accident area Z2 from the some area Z1-Z4, respectively. For example, the power failure sections are the section Z3 and the section Z4. As shown in FIG. 1, the power failure section identification unit 23 is connected to, for example, a circuit breaker current value storage unit 25 and operates when the value stored in the circuit breaker current value storage unit 25 becomes zero.

  The apparent load calculation unit 24 for each section is based on the connection relation information stored in the system configuration storage unit 27 and the current value passing through the switch stored in the switch current value storage unit 26, so that the power failure before the occurrence of the accident occurs. An apparent load, which is a passing current in the sections Z3 and Z4, is calculated for each power outage section Z3 and Z4. For example, the apparent load in the zone Z3 is a subtraction value between the current value of the switch N2 and the current value of the switch N3. The apparent load in the zone Z4 is the current value of the switch N3.

  The actual load estimation unit 21 for each section is based on the output of the distributed power source that is the output of the distributed power output estimation unit 10 and the apparent load that is the output of the apparent load calculation unit 24 for each section before the occurrence of the accident. The actual load that is the current actually consumed by Z3 and Z4 is calculated. For example, the actual load in the section Z3 is an added value of the distributed power output in the section Z3 and the apparent load in the section Z3. The actual load in the section Z4 is an added value of the distributed power output in the section Z4 and the apparent load in the section Z4.

  The interchangeable range determination unit 22 includes a current value passing through the circuit breaker CB2 stored in the circuit breaker current value storage unit 25, connection relation information stored in the system configuration storage unit 27, switching information and allowable passing current information, and Based on the actual load that is the output of the section-by-section actual load estimator 21, the first interchangeable range that is the section range in which the second distribution line F <b> 2 can accommodate the current is specified.

  Specifically, the interchangeable range determination unit 22 specifies from the connection relation information stored in the system configuration storage unit 27 that the power failure section Z4 is the terminal section of the first distribution line F1. Further, the interchangeable range determination unit 22 grasps from the switching information stored in the system configuration storage unit 27 that the switch N4 is in an open state. The interchangeable range determination unit 22 determines the current (accommodation) that can be accommodated in the first distribution line F1 from the subtraction value between the allowable passing current information of the circuit breaker CB2 of the second distribution line F2 and the current passing through the circuit breaker CB2. Possible current). Then, the accommodable range determination unit 22 compares the accommodable current with the actual load in the power outage section Z4. If the interchangeable current is smaller than the actual load in the power failure section Z4, the interchangeable range determination unit 22 specifies that there is no first interchangeable range. For this reason, the interchangeable range determination unit 22 does not interchange current. On the other hand, if the interchangeable current is larger than the actual load in the power failure section Z4, the interchangeable range determination unit 22 further determines whether or not the current can be accommodated up to the power failure section Z3.

  That is, the interchangeable range determination unit 22 specifies that the power outage section Z3 is adjacent to the power outage section Z4 from the connection relation information stored in the system configuration storage unit 27. Further, the accommodable range determination unit 22 grasps from the switching information stored in the system configuration storage unit 27 that the switch N3 is in an open state. The interchangeable range determination unit 22 compares the interchangeable current with the added value of the actual load in the power outage section Z4 and the actual load in the power outage section Z3. If the interchangeable current is smaller than the added value of the actual load in the power failure section Z4 and the actual load in the power failure section Z3, the interchangeable range determination unit 22 specifies that the first interchangeable range is only the power failure section Z4. Then, the interchangeable range determination unit 22 inputs only the switch N4 and performs current interchange only in the section Z4. Thereby, a power distribution system will be in the state shown in FIG. On the other hand, if the interchangeable current is larger than the added value of the actual load in the power failure section Z4 and the actual load in the power failure section Z3, the interchangeable range determination unit 22 determines that the first interchangeable range is the power failure section Z4 and the power failure section Z3. Is identified. Then, the interchangeable range determination unit 22 turns on the switches N3 and N4, and performs current accommodation in the power failure sections Z3 and Z4. Thereby, a power distribution system will be in the state shown in FIG.

  When the interchangeable range determination unit 22 specifies that the first interchangeable range is only the power outage section Z4 and performs current accommodation only in the power outage section Z4 (when the distribution system is in the state of FIG. 7), A current is supplied from the second distribution line F2 to the power failure section Z4. When a current is supplied to the power failure section Z4, the distributed power source G2 disconnected from the power failure section Z4 is automatically reconnected to the power failure section Z4 after the power recovery time. The power recovery time is the time from when the current is passed from the second distribution line F2 to the power failure section Z4 until the distributed power source G2 is reconnected to the power failure section Z4. The power recovery time of the distributed power source G2 is stored in the system configuration storage unit 27 as described above. For example, the power recovery time of the distributed power supply G2 is 3 minutes. When the distributed power source G2 is connected again to the section Z4, the output passing through the circuit breaker CB2 is reduced because the output of the distributed power source G2 covers a part of the load in the section Z4. Thereby, the interchangeable electric current of the 2nd distribution line F2 increases.

  Based on the power recovery time information stored in the system configuration storage unit 27, the interchangeable range determination unit 22 identifies that the distributed power source G2 in the first interchangeable range is connected. The interchangeable range determination unit 22 then determines the current value passing through the circuit breaker CB2 stored in the circuit breaker current value storage unit 25, connection relation information stored in the system configuration storage unit 27, switching information, and allowable passing current information. In addition, based on the actual load that is the output of the actual load estimation unit 21 for each section, a second interchangeable range that is wider than the first interchangeable range is specified. In this embodiment, the power recovery time is the same for all the distributed power sources, but a different power recovery time may be set for each distributed power source. When the power recovery time is different for each distributed power source, the interchangeable range determination unit 22, for example, the connection section information stored in the distributed power source connection section storage unit 16 and the power recovery stored in the system configuration storage unit 27. Based on the time information, it may be specified that the distributed power source G2 in the first interchangeable range is connected.

  Specifically, the interchangeable range determination unit 22 determines that the distributed power source G2 has entered the power outage zone Z4 since 3 minutes, which is the power recovery time of the distributed power source G2, has elapsed since the current was accommodated in the power outage zone Z4. Identify being connected. Then, the interchangeable range determination unit 22 specifies that the power outage section Z3 is adjacent to the power outage section Z4 from the connection relation information stored in the system configuration storage unit 27. Further, the accommodable range determination unit 22 grasps from the switching information stored in the system configuration storage unit 27 that the switch N3 is in an open state. And the interchangeable range determination unit 22 compares the interchangeable current with the actual load in the power outage section Z3. If the interchangeable current is smaller than the actual load in the section Z3, the interchangeable range determination unit 22 specifies that there is no second interchangeable range. For this reason, the interchangeable range determination unit 22 does not perform interchange of current to the power outage section Z3. On the other hand, if the interchangeable current is larger than the actual load in the section Z3, the interchangeable range determination unit 22 specifies that the second interchangeable range is the power outage section Z3 and the power outage section Z4. Thereby, the interchangeable range determination unit 22 turns on the switch N3, and performs current interchange also in the power outage section Z3. Thereby, a power distribution system will be in the state shown in FIG.

  FIG. 9 is a flowchart illustrating a method for accommodating current using the distributed power output prediction system according to the present embodiment. In order to explain more specifically, in FIG. 4 showing the normal time, the current passing through the circuit breakers CB1 and CB2 is 200 [A], the current passing through the switch N1 is 150 [A], and the current passing through the switch N2 Is 100 [A], the current passing through the switch N3 is 50 [A], the power generation amounts of the distributed power sources G1 and G2 are 100 [A], and the allowable passing current of the circuit breaker CB2 is 420 [A]. Assuming a method of distributing power using the distribution automation control device 100 is described below.

  The power distribution automation control device 100 acquires current values from the circuit breakers CB1 and CB2 and the switches N1 to N7 at a normal time as shown in FIG. 4, and generates the circuit breaker current value storage unit 25 and the switch current value storage unit 26. (Step S1). The circuit breaker current value storage unit 25 stores that the current passing through the circuit breaker CB1 is 200 [A]. In the switch current value storage unit 26, the current passing through the switch N1 is 150 [A], the current passing through the switch N2 is 100 [A], and the current passing through the switch N3 is 50 [A]. Remember.

  The power failure section specifying unit 23 always acquires the current values of the circuit breakers CB1 and CB2 stored in the circuit breaker current value storage unit 25. When the current value of the circuit breaker CB1 becomes 0, the circuit breaker CB1 It senses that it has been released (step S2, Yes). As long as the current value of the circuit breaker CB1 does not become 0, the circuit breaker current value storage unit 25 and the switch current value storage unit 26 continue to store the current values of the circuit breakers CB1, CB2 and the switches N1 to N7 (step S2). , No).

  When the circuit breaker CB1 is opened, no current is supplied to the first distribution line F1, and the switches N1 to N3 are automatically opened. For this reason, the distributed power sources G1 and G2 connected to the first distribution line F1 are automatically disconnected in order to prevent independent operation (step S3). Thereby, a power distribution system will be in the state shown in FIG.

  Next, the power failure section specifying unit 23 specifies an accident section from the plurality of sections Z1 to Z4 based on the connection relation information and the switching information stored in the system configuration storage unit 27 (step S4). And the power failure area specific | specification part 23 specifies the area Z3, Z4 located in the terminal side rather than the accident area Z2 from the some area Z1-Z4 as the power failure area Z3, Z4, respectively.

  Next, triggered by the fact that the power failure section identification unit 23 has identified the power failure sections Z3 and Z4, the section apparent load calculation unit 24 calculates the apparent load of the power failure sections Z3 and Z4 (step S5). The apparent load calculation unit 24 for each section uses the subtraction value between the current value 100 [A] of the switch N2 and the current value 50 [A] of the switch N3 stored in the switch current value storage unit 26 to determine the power outage section Z3. Is calculated to be 50 [A]. The apparent load calculation unit 24 for each section calculates that the apparent load of the power failure section Z4 is 50 [A] from the current value 50 [A] of the switch N3 stored in the switch current value storage unit 26. To do.

  Next, the distributed power output estimation unit 10 calculates the output of the distributed power source linked to the power failure sections Z3 and Z4 for each section before the occurrence of the accident (step S6). Specifically, first, the distributed power source weather estimation unit 11 calculates the amount of solar radiation in the distributed power sources G1 and G2. Then, the distributed power source output estimation unit 12 calculates that the output of each of the distributed power sources G1 and G2 is 100 [A]. Thereafter, the section-by-section output estimation unit 13 obtains an added value of the outputs of the distributed power sources belonging to the same section, the distributed power output of the power failure section Z3 is 100 [A], and the distributed power output of the power failure section Z4 is 100 [A] is calculated. Note that the order of step S5 and step S6 may be reversed.

  Next, the actual load estimation unit 21 for each section calculates the actual load for each of the power failure sections Z3 and Z4 (step S7). It has already been calculated that the apparent load in the power outage section Z3 is 50 [A] and the distributed power output in the power outage section Z3 is 100 [A]. For this reason, the actual load estimation unit 21 for each section calculates that the actual load in the power outage section Z3 is 150 [A], which is an addition value of 50 [A] and 100 [A]. It has already been calculated that the apparent load of the power failure section Z4 is 50 [A] and the distributed power output of the power failure section Z4 is 100 [A]. For this reason, the actual load estimation unit 21 for each section calculates that the actual load of the power outage section Z4 is 150 [A], which is an addition value of 50 [A] and 100 [A].

  Next, the interchangeable range determination unit 22 determines whether current can be accommodated from the second distribution line F2 which is a healthy distribution line in which no accident has occurred to the first distribution line F1. Specifically, the interchangeable range determination unit 22 uses the subtraction value between the allowable passing current 420 [A] of the circuit breaker CB2 of the second distribution line F2 and the current 200 [A] passing through the circuit breaker CB2. , The interchangeable current is calculated to be 220 [A]. The interchangeable range determination unit 22 compares the interchangeable current 220 [A] with the actual load 150 [A] in the section Z4. Since the interchangeable current 220 [A] is larger than the actual load 150 [A] in the section Z4, the interchangeable range determination unit 22 specifies that interchange is possible, and proceeds to Step S9 (Yes in Step S8). If the interchangeable current is smaller than the actual load in the section Z4, the interchangeable range determination unit 22 determines that the interchange is impossible (No in step S8).

  Next, the interchangeable range determination unit 22 identifies the first interchangeable range (step S9). The interchangeable range determination unit 22 compares the interchangeable current 220 [A] with 300 [A] that is an addition value of the actual load 150 [A] in the section Z4 and the actual load 150 [A] in the section Z3. . Since the interchangeable current 220 [A] is smaller than the added value 300 [A] of the actual loads in the sections Z4 and Z3, the interchangeable range determination unit 22 specifies that the first interchangeable range is only the power failure section Z4. To do.

  Next, the interchangeable range determination unit 22 turns on the switch N4, and links the power failure section Z4 that is the first interchangeable range to the second distribution line F2 that is a healthy distribution line (step S10). Thereby, a power distribution system will be in the state shown in FIG. For this reason, a current is supplied to the power failure section Z4 from the second distribution line F2. At this time, the current passing through the circuit breaker CB2 is 350 [A], which is an addition value of the current 200 [A] that originally passed and the actual load 150 [A] in the section Z4.

  Next, the distributed power source G2 in the power failure section Z4, which is the first accommodable range, is automatically linked to the section Z4 after the elapse of 3 minutes as the power recovery time after receiving the accommodation (step S11). The interchangeable range determination unit 22 determines that the distributed power source G2 has been connected to the power failure section Z4 since 3 minutes, which is the power recovery time of the distributed power source G2, has elapsed since the current was accommodated in the power failure section Z4. Is identified. When the distributed power source G2 is connected to the power failure section Z4, the output 100 [A] of the distributed power source G2 covers a part of the load in the section Z4, so that the current passing through the circuit breaker CB2 starts from 350 [A]. It decreases to 250 [A]. Note that the output of the distributed power supply G2 may change with the passage of time since the occurrence of the accident, but for convenience of explanation, it is assumed that the output remains 100 [A].

  Next, based on the opening / closing information stored in the system configuration storage unit 27, the interchangeable range determination unit 22 determines whether or not all of the power failure sections Z3 and Z4 have been interconnected. Since the switch N3 is opened, the interchangeable range determination unit 22 specifies that the power failure section Z3 is not linked among the power failure sections Z3 and Z4 (step S12, No), and returns to step S8. .

  Next, the interchangeable range determination unit 22 determines again whether or not current can be accommodated from the second distribution line F2 which is a healthy distribution line to the first distribution line F1. Specifically, the interchangeable range determination unit 22 calculates a subtraction value between the allowable passing current 420 [A] of the circuit breaker CB2 of the second distribution line F2 and the current 250 [A] passing through the circuit breaker CB2. , The interchangeable current is calculated to be 170 [A]. The interchangeable range determination unit 22 then compares the interchangeable current 170 [A] with the actual load 150 [A] in the power failure section Z3. Since the interchangeable current 220 [A] is larger than the actual load 150 [A] in the power failure section Z3, the interchangeable range determination unit 22 specifies that interchange is possible, and proceeds to step S9 (Yes in step S8).

  Next, the interchangeable range determination unit 22 specifies a second interchangeable range that is wider than the first interchangeable range (step S9). The interchangeable range determination unit 22 specifies from the opening / closing information that only the power failure section Z3 is not connected among the power failure sections Z3 and Z4. And the interchangeable range determination unit 22 indicates that the interchangeable current 220 [A] is larger than the actual load 150 [A] of the power outage section Z3, so that the second accommodable range is the power outage section Z3 and the power outage section Z4. Identify.

  Next, the interchangeable range determination unit 22 turns on the switch N3 and links the power failure section Z3 and the power failure section Z4, which are the second interchangeable range, to the second distribution line F2 (step S10). Thereby, a power distribution system will be in the state shown in FIG. For this reason, an electric current is supplied to the area Z3 from the 2nd distribution line F2.

  Next, the distributed power source G1 in the power outage section Z3 that has received accommodation from the second distribution line F2 is automatically connected to the power outage section Z3 after 3 minutes, which is the power recovery time after receiving accommodation (step S11). ).

  Next, based on the opening / closing information stored in the system configuration storage unit 27, the interchangeable range determination unit 22 determines whether or not all of the power failure sections Z3 and Z4 have been interconnected. Since the switches N3 and N4 are turned on, the interchangeable range determination unit 22 specifies that all of the power failure sections Z3 and Z4 have been linked (step S12, Yes).

  Note that the distributed power output may not necessarily be calculated by the distributed power output estimation unit 10. For example, by providing a measuring device that can measure the output of each distributed power supply, the distributed power output can be directly obtained. However, since a large amount of cost is required to provide a measuring device for each distributed power source, it is preferable to calculate the distributed power output using the distributed power output estimation unit 10 as in this embodiment. .

  As described above, the distributed power output prediction system 200 according to the present embodiment is a distributed power output prediction system 200 for power distribution automation, and is connected to the first distribution line F1 and the first distribution line F1. Circuit breakers CB1 and CB2 provided at the end of each second distribution line F2 on the substation SS side, and a plurality of switches that divide the first distribution line F1 and the second distribution line F2 into a plurality of sections Z1 to Z8 N1 to N7, distributed power sources G1 and G2 connected to the first distribution line F1 or the second distribution line F2, and the distribution automation control device 100 are included. The distribution automation control device 100 includes a circuit breaker current value storage unit 25 that stores current values passing through the circuit breakers CB1 and CB2, and a switch current value storage unit 26 that stores current values passing through the switches N1 to N7. . The distribution automation control device 100 includes connection relation information between the plurality of sections Z1 to Z8, switching information about the plurality of circuit breakers CB1 and CB2 and the plurality of switches N1 to N7, and power recovery time of the distributed power sources G1 and G2. A system configuration storage unit 27 that stores information and allowable passage current information of the circuit breakers CB1 and CB2, and a distributed power source information storage unit 17 that stores information on the distributed power sources G1 and G2. When an accident occurs in the first distribution line F1, the distribution automation control device 100 specifies the accident section Z2 from the plurality of sections Z1 to Z8 based on the connection relation information and the switching information, and the plurality of sections Z1 to Z1. A power outage section specifying unit 23 is provided that specifies the sections located on the terminal side of the accident section Z2 from among Z8 as power outage sections Z3 and Z4, respectively. The distribution automation control device 100 calculates the outputs of the distributed power sources G1 and G2, which were linked to the power failure sections Z3 and Z4 before the occurrence of the accident, for each power failure section Z3 and Z4 based on the information on the distributed power sources. The distributed power output estimation unit 10 is provided. Based on the connection relation information and the current value passing through the switch, the distribution automation control device 100 calculates the apparent load, which is the current passing through the power failure sections Z3 and Z4, before the occurrence of the accident, for each power failure section Z3 and Z4. An apparent load calculation unit 24 is provided for each section. Based on the outputs and apparent loads of the distributed power sources G1 and G2, the power distribution automation control device 100 converts the actual load that is the current actually consumed in the power outage section Z3 and Z4 before the occurrence of the accident into the power outage section Z3, A section-by-section actual load estimator 21 for each Z4 is provided. The distribution automation control device 100 is a range of a power outage section in which the second distribution line F2 can accommodate current based on the current value passing through the circuit breaker, connection relation information, switching information and allowable passing current information, and the actual load. The interchangeable range determination unit 22 that specifies the first interchangeable range (power failure section Z4) is provided. The interchangeable range determination unit 22 identifies that the distributed power sources in the first interchangeable range are connected based on the power recovery time information, and determines the current value passing through the circuit breaker, connection relation information, switching information, and allowable Based on the passing current information and the actual load, a second interchangeable range (power failure section Z4 and power failure section Z3) wider than the first interchangeable range (power failure section Z4) is specified.

  Thereby, since the distribution automation control apparatus 100 can perform current accommodation based on the actual load, it is possible to suppress the possibility that the breaker of the sound distribution line trips. In addition, the distribution automation control device 100 can specify that the distributed power source disconnected when the accident occurs is connected again based on the power recovery time of the distributed power source. Can be faster. Therefore, the distributed power output prediction system 200 can suppress the possibility that the breaker of the sound distribution line will trip, and can quickly reduce the range of the power failure section.

  Moreover, the distribution automation control apparatus 100 includes a weather prediction information storage unit 18 that stores weather prediction information. The distributed power supply information storage unit 17 includes a distributed power supply position storage unit 14 that stores position information of the distributed power supplies G1 and G2, and a distributed power supply property storage unit 15 that stores output characteristic information of the distributed power supplies G1 and G2. And a distributed power supply interconnection section storage unit 16 that stores interconnection section information of the distributed power supplies G1 and G2. The distributed power output estimation unit 10 calculates the outputs of the distributed power sources G1 and G2 for each power failure section Z3 and Z4 based on the weather forecast information, the position information, the output characteristic information, and the interconnection section information.

  As a result, the distributed power output estimation unit 10 can calculate the outputs of the distributed power supplies G1 and G2 without providing a measuring device for measuring the outputs of the distributed power supplies G1 and G2. For this reason, the distribution automation control apparatus 100 can easily calculate an actual load that is an added value of the apparent load and the outputs of the distributed power sources G1 and G2.

DESCRIPTION OF SYMBOLS 10 Distributed power output estimation part 11 Distributed power source weather estimation part 12 Distributed power source output estimation part 13 Section output estimation part 14 Distributed power position storage part 15 Distributed power characteristic storage part 16 Distributed power connection section Storage unit 17 Distributed power information storage unit 18 Weather forecast information storage unit 100 Distribution automation control device 100a Input interface 100b Output interface 100c CPU
100d ROM
100e RAM
100f Internal storage device 20 Power distribution control unit 21 Actual load estimation unit for each section 22 Allowable range determination unit 23 Power outage section specifying unit 24 Apparent load calculation unit for each section 25 Breaker current value storage unit 26 Switch current value storage unit 27 System configuration Storage unit 200 Distributed power output prediction system 3 Weather observation information 4 Weather prediction system 5 Distributed power management system CB, CB1, CB2 Circuit breakers f1, f2 Distribution line F1 First distribution line F2 Second distribution lines g1-g3, G1 , G2 Distributed power source m1-m3 Mesh n1-n3, N, N1-N7 Switch ss, SS Substation TF Transformer z1-z4, Z1-Z8 Section

Claims (2)

A circuit breaker provided at each substation-side end of the first distribution line and the second distribution line connected to the first distribution line;
A plurality of switches that divide the first distribution line and the second distribution line into a plurality of sections;
A distributed power source linked to the first distribution line or the second distribution line;
A distribution automation control device, and
The power distribution automation control device for controlling the switch,
A circuit breaker current value storage unit for storing a current value passing through the circuit breaker;
A switch current value storage unit for storing a current value passing through the switch;
A system for storing connection relation information between the plurality of sections, switching information of the plurality of circuit breakers and the plurality of switches, power recovery time information of the distributed power source, and allowable passing current information of the circuit breakers A configuration storage unit;
A distributed power information storage unit for storing information on the distributed power;
When an accident occurs in the first distribution line, an accident section is specified from the plurality of sections based on the connection relation information and the opening / closing information, and the end of the plurality of sections is shorter than the accident section. A power failure section identifying unit that identifies each section located on the side as a power failure section;
Based on the information on the distributed power source, a distributed power output estimation unit that calculates the output of the distributed power source linked to the power outage section before the occurrence of the accident, for each power outage section;
Based on the connection relation information and the current value passing through the switch, the apparent load that is the passing current of the power outage section before the occurrence of the accident is calculated for each section of the apparent load,
Based on the output of the distributed power source and the apparent load, an actual load estimation unit for each section that calculates an actual load that is actually consumed in the power outage section before the occurrence of the accident for each power outage section. When,
Based on the current value passing through the circuit breaker, the connection relationship information, the switching information and the allowable passing current information, and the actual load, the first distribution line is a range of a power outage section in which current can be accommodated. A flexible range determination unit for identifying a flexible range;
With
The interchangeable range determination unit identifies that the distributed power source in the first interchangeable range is connected based on the power recovery time information, and the current value passing through the circuit breaker, the connection relation information A distributed power output prediction system characterized by specifying a second interchangeable range wider than the first interchangeable range based on the switching information, the allowable passing current information, and the actual load. The power distribution automation control device includes a weather prediction information storage unit that stores weather prediction information,
The distributed power source information storage unit includes a distributed power source location storage unit that stores position information of the distributed power source, a distributed power source characteristic storage unit that stores output characteristic information of the distributed power source, and the distributed power source. A distributed power interconnection section storage unit that stores the interconnection section information of
The distributed power output estimation unit calculates the output of the distributed power for each power outage section based on the weather forecast information, the position information, the output characteristic information, and the interconnection section information. The distributed power output prediction system according to claim 1.

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