Restoration decision support device and restoration decision support method

Abstract

To provide a restoration intention determination support device and a restoration intention determination support method that plan individual operations in restoration from a power failure of a power distribution system and then make a restoration work plan taking an individual operation plan into consideration so as to achieve power failure restoration for as many users as possible as early as possible.SOLUTION: There is provided a restoration intention determination support device for reconnecting a power system section disconnected owing to an accident of a power system to the power system, and the restoration intention determination support device comprises: an individual operation plan part which defines switch sections divided with adjacent switches in the disconnected power system section, and makes an individual operation plan including, as an individual operation section, a switch section having at least a decentralized power supply therein or arranged with a power supply vehicle; the individual operation plan part making an individual operation plan including, as an independent operation section, a switch section in which facilities having accident or damage are present in the power system; and a restoration work plan part which makes a restoration work plan for an individual operation section in which facilities having accident or damage are present in the switch section among the individual operation plans that the individual operation plan part generates.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a restoration decision-making support device and a restoration decision-making support method that formulate a restoration work plan taking into account an islanding operation plan and support restoration decision-making for a power system operated by a system operator or the like. [Background technology]

[0002] In recent years, the introduction of distributed power sources such as renewable energy sources into power grids has been progressing. On the other hand, large-scale disasters such as typhoons and floods are on the rise, and cases of large-scale power outages and prolonged recovery due to core system failures and multiple failures in distribution systems have become apparent. Power infrastructure is required to respond to these power supply disruptions. In the future, new power system operations will be necessary to maximize the use of distributed power sources connected to the power grid, achieve widespread and early power outage recovery, and subsequently provide a stable power supply.

[0003] In particular, in the power infrastructure, the introduction of distributed power sources such as solar power generation has progressed significantly in the power distribution system, and independent operation in the event of an emergency is being considered. However, in the case of recovery work following an accident or equipment damage, plans are made without considering the impact of restoration of power due to independent operation, and it is expected that efficient recovery work will be an issue. For this reason, there is a need to consider independent operation in the power distribution system in the event of an emergency and maximize the number of consumers who recover from a blackout as quickly as possible.

[0004] Background of this technical field is the invention described in Patent Document 1. The abstract of this document states, "The area information storage unit 120 stores area data 10, the power distribution facility information storage unit 130 stores power distribution facility data 20, and the commander simulator 141, the patrol simulator 142, and the restorer simulator 143 refer to the area information storage unit 120 and the power distribution facility information storage unit 130 to simulate the work of the commander, the patrol, and the restorer. The restorer simulator 143 also simulates the movement of the restorer to the affected area and the waiting for instructions from the commander." [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2014-2783 A Summary of the Invention [Problem to be solved by the invention]

[0006] According to Patent Document 1, restoration work plans can be drawn up by allocating restoration target facilities to restoration work teams so that restoration can be achieved as quickly as possible. However, the load capacity to be restored by the restoration of each facility is not taken into consideration, and it is not possible to restore power to more customers efficiently. In addition, since no isolated operation is planned, it is not possible to draw up a plan to restore power to customers in healthy power outage areas by isolated operation, and it is not possible to distinguish areas where power is scheduled to be restored by isolated operation, making it impossible to formulate an efficient restoration plan.

[0007] Therefore, the present invention aims to provide a restoration decision-making support device and a restoration decision-making support method that can restore power to as many customers as possible as quickly as possible by planning isolated operation when a power outage is restored in a power distribution system and formulating a restoration work plan that takes into account the isolated operation plan. [Means for solving the problem]

[0008] In view of the above, the present invention is a "restoration decision-making support device for reconnecting a power system section that has been isolated due to an accident in the power system to the power system, characterized in that the device comprises: an isolated operation planning unit that defines, for the isolated power system section, a switch section that is divided by adjacent switches, and prepares an isolated operation plan for at least the switch section that has a distributed power source therein or in which a power source vehicle is installed, and a restoration work planning unit that prepares a restoration work plan for a switch section of the power system in which an accident or damaged equipment is present."

[0009] Furthermore, the present invention is described as "a restoration decision-making support method, which is realized using a computer, for reconnecting to the power system a section of a power system that has been isolated due to an accident in the power system, characterized in that for the isolated power system section, a switch section divided by adjacent switches is defined, at least a switch section that has a distributed power source therein or in which a power source vehicle is installed is designated as an isolated operation section, and a restoration work plan is drawn up for a switch section of the power system in which an accident or damaged equipment is present." Effect of the Invention

[0010] According to the present invention, a plan can be formulated for restoring power to a power outage area in a power grid as quickly and widely as possible. [Brief description of the drawings]

[0011] [Figure 1] FIG. 1 is a block diagram showing a restoration decision support device according to an embodiment of the present invention. [Diagram 2] 1 is a diagram showing an example of the configuration of a power distribution system L to which the present invention can be applied. [Diagram 3] FIG. 2 is a diagram showing an example of system information D1 among various types of information stored in a large-capacity storage unit DB. [Figure 4] FIG. 13 is a diagram showing an example of facility damage information D2 among various information stored in the large-capacity storage unit DB. [Diagram 5] FIG. 13 is a diagram showing an example of power outage information D3 among various types of information stored in the large-capacity storage unit DB. [Figure 6] FIG. 13 is a diagram showing an example of important load information D4 among various information held in the large-capacity storage unit DB. [Figure 7] FIG. 13 is a diagram showing an example of map information D5 among various types of information stored in the large-capacity storage unit DB. [Figure 8] FIG. 13 is a diagram showing an example of resource information D6 among various types of information held in the large-capacity storage unit DB. [Figure 9] FIG. 13 is a diagram showing an example of task required time information D8 among various information stored in the large-capacity storage unit DB. [Figure 10]4 is a flowchart showing a process of an isolated operation planning unit 7. [Figure 11] FIG. 11 is a diagram showing a result of matrix creation in processing step S71 of FIG. [Figure 12] 4 is a flowchart showing the process of a recovery operation planning unit 9. [Figure 13] 13 is a flowchart showing a process of a screen output unit. [Figure 14] FIG. 4 is a diagram showing an example of a screen output by a screen output unit. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. EXAMPLES

[0013] 1 is a block diagram showing a recovery decision support device according to an embodiment of the present invention. The recovery decision support device 12 is configured by a computer having a processor CPU (Central Processing Unit), a RAM (Random Access Memory: not shown), and a non-volatile large-capacity storage DB. Note that the present invention is not limited to a single device, and may be implemented as a recovery decision support system in which multiple servers and the like cooperate with each other.

[0014] The recovery decision-making support device 12, which is realized using a computer, has the functions of an isolated operation planning unit 7, a recovery planning unit 9, and a screen output unit 10, when the processing contents in its calculation unit CPU are expressed in terms of processing functions, and is further configured to include a display unit 11 and an input device 13.

[0015] The restoration decision-making support device 12 further stores system information D1, equipment damage information D2, power outage information D3, important load information D4, map information D5, resource information D6, work time information D8, and a restoration decision-making support program Pr in the non-volatile large-capacity memory unit DB.

[0016] In order to explain the specific contents of this information, an example of the configuration of a power distribution system L to which the present invention can be applied will be described with reference to Fig. 2. The power distribution system L includes a plurality of consumers Ld (Ld1-Ld14), a plurality of distributed power sources G (G1-G3), a substation, and switches SW (SW1-SW4) such as circuit breakers and switches. Each consumer is represented by a black circle node and an adjacent symbol such as "Ld1" or "Ld2".

[0017] With this configuration, each consumer Ld can receive power supply from the external power source G. For example, when normal operation is being performed, switches SW (SW1-SW4) such as circuit breakers and switches are closed, and the consumer Ld is connected to the external power source G via the switch SW3, thereby supplying power to the multiple consumers Ld.

[0018] However, when the illustrated section is cut off from the external power source G due to an accident in the power distribution system L, the switches SW (SW1-SW4) are closed again after the accident is cleared to restore the system, but the present invention assumes how the system should be operated during the period from the accident to the recovery wait. For example, when a large-scale power outage occurs due to an earthquake, the recovery period is gradually extended, but the period until recovery may take several days to tens of days, and the present invention is particularly useful in cases of long-term power outages.

[0019] In the state of waiting for recovery, all the switches SW are open, and according to this example of the power distribution system, an islanding operation section can be formed in an appropriate section. For example, the section L1 divided by the switches SW3 and SW1 includes the consumers Ld1-Ld3, the substation, and the distributed power source G3, and therefore can form an islanding operation section. Similarly, the section L2 divided by the switches SW1, SW2, and SW4 includes the consumers Ld4-Ld7, the substation, and the distributed power source G1, and therefore can form an islanding operation section. Furthermore, the section L3 divided by the switch SW2 includes the consumers Ld9-Ld14, the substation, and the distributed power source G2, and therefore can form an islanding operation section. However, the section L4 divided by the switch SW4 includes the consumer Ld, but is not connected to the distributed power source G when the switch SW4 is opened, and therefore cannot form an islanding operation section. In the above explanation, it is stated that the smallest section between adjacent switches can be an isolated operation section, but an appropriately expanded section may be defined as an isolated operation section. In addition, the distributed power source G in the above includes renewable energy sources such as solar power generation and wind power generation, cogeneration equipment, and storage facilities.

[0020] However, the isolated operation section described here merely describes the possibility of operation using the distributed power source G, and other requirements must be confirmed for actual operation. In the present invention, the process taking these confirmation items into consideration will be described below.

[0021] Various information stored in the non-volatile mass storage unit DB in the restoration decision-making support device 12 in Fig. 1 will be described below with reference to the example of the power distribution system L in Fig. 2. First, an example of system information D1 is illustrated in Fig. 3.

[0022] The system information D1 is information indicating the number D11 of each switch Sw, the number D12 of the adjacent switch Sw, the load capacity D13 in each switch section, the customer number D14, the distributed power source number (distributed power source is a concept including a substation and a distributed power source) D15, the distributed power source capacity D16, and the presence or absence of a voltage source D17 (information indicating whether or not a voltage source required to start up an isolated operation system exists in the switch section) as information on each switch (switch SW) in the example of Fig. 2 managed by this restoration decision-making support device 12. Note that the information group in the first row of Fig. 3 defines the section L2, and the information group in the second row defines the section L1.

[0023] The system information D1 shown in Fig. 3 is linked to the distribution system L in Fig. 2 managed by the restoration decision-making support device 12. The system information D1 indicates the positions of, for example, switches SW such as switches, distributed power sources G, distribution substations, etc., and is configured to include, for example, information on switch numbers D11, D12, distributed power source numbers D15, numbers identifying distribution substations, and consumer numbers D14 corresponding to nodes. The distribution system L managed by the restoration decision-making support device 12 may have any configuration as long as it is linked to the system information D1, and is not limited to the configuration shown in Fig. 2. In addition, each element of the distribution system L managed by the restoration decision-making support device 12 is linked to position information on a map such as roads and houses shown in the map information D4.

[0024] As shown in FIG. 4, the equipment damage information D2 is information for identifying the location and type of the accident or equipment damage in the power distribution system L, and here, stores an equipment damage number D21, a switch number D22, and an equipment damage type D23. The equipment damage number D21 stores information on a serial number for identifying the accident or equipment damage in the power distribution system L shown in FIG. 2. The switch number field D22 stores information on the switch number constituting the switch section in which the accident or equipment damage corresponding to the equipment damage number D21 has occurred. Here, the switch number D22 corresponds to the switch numbers D11 and D12 of the system information D1. The equipment damage type field D23 stores information on the type of the accident or equipment damage corresponding to the equipment damage number D21. The type of the accident or equipment damage is, for example, a broken utility pole or high-voltage line damage. The equipment damage information D2 may hold an equipment failure location field, in which case the detailed location of the equipment failure is stored as, for example, coordinate information linked to the power distribution system L.

[0025] The first line in Fig. 4 indicates that a utility pole breakage occurred between switch SW1 and switch SW2 in the power distribution system in Fig. 2. The second line indicates that high-voltage line damage occurred between switch SW2 and switch SW4 in the power distribution system in Fig. 2.

[0026] As shown in Fig. 5, the power outage information D3 is information indicating the energization or power outage state of each switch section in the power distribution system L, and includes, for example, a switch number D31 and a power outage flag D32. The switch number field D31 stores information on serial numbers that identify the switches D11 and D12 that constitute each switch section of the power distribution system L shown in Fig. 2. Here, the switch number D31 corresponds to the switch numbers D11 and D12 in the system information D1. The power outage flag field D32 stores information indicating whether or not a power outage has occurred in each switch section. For example, if a power outage has occurred, 1 is stored, and if not, 0 is stored.

[0027] As illustrated in FIG. 6, the important load information D4 is information indicating the customer number D41 of each important load such as a hospital or a shelter, and the load capacity D42 and importance D43 of the important load. The customer number field D41 stores information of a serial number that identifies an important load such as a hospital or a shelter in the power distribution system L shown in FIG. 2. Here, the customer number of the important load corresponds to the customer number in the system information D1. The load capacity field D42 stores information on the load capacity of the important load. The importance field D43 stores information on the importance of the important load that is arbitrarily set. Here, for example, numbers 1 to 5 are stored, which indicate that the larger the number, the more important the load is evaluated to be. The importance is not limited to this as long as it can be handled by the processing in the isolated operation planning unit 7 and the restoration work planning unit 9 described later. Also, the importance does not necessarily need to be handled by the processing in the isolated operation planning unit 7 and the restoration work planning unit 9, but details will be described later in the embodiment of each processing unit.

[0028] 7, the map information D5 is a map of an area corresponding to the power distribution system L, and is information indicating a road network, impassable road locations, houses, etc. The impassable road information is information indicating sections of impassable roads.

[0029] As illustrated in FIG. 8, the resource information D6 is information regarding resource types D61 such as workers and work vehicles that can be used in the power distribution system L, resource amounts D62, and resource locations.

[0030] The resource type column D61 stores information on workers, vehicles required for recovery work such as high-voltage generator vehicles (hereinafter referred to as power supply vehicles) and pole hole digging vehicles, or drones. Workers may be divided into work crews in advance based on skills, etc., in which case, for example, work crews such as high-voltage line repair work crews and utility pole breakage response crews may be stored as resource types. Here, power supply vehicles hold capacity information such as power supply vehicle (1200 kVA) and power supply vehicle (1500 kVA), and power supply vehicles with different capacities are stored as different resource types. The resource number column D62 stores the number of each resource.

[0031] As shown in FIG. 9, the work time information D8 is information indicating the restoration work required time D82 for each equipment damage type D81. The equipment damage type field D81 stores information on the type of accident or equipment damage. The types of accidents or equipment damage include, for example, broken utility poles and high-voltage line damage. The restoration work required time field D82 stores information on the time required for restoration workers to restore the accident or equipment damage corresponding to the equipment damage type. Here, the required time is the time from when the restoration worker arrives at the site to when he or she finishes the restoration work, and does not include travel time. The required time can be set arbitrarily by the user, and for example, the average work required time in past restoration work can be stored.

[0032] Returning to Fig. 1, various processing functions executed by the calculation unit CPU will be described. First, the isolated operation planning unit 7 is a functional unit that creates an isolated operation plan based on the system information D1, the facility damage information D2, the power outage information D3, the map information D4, the important load information D5, and the resource information D6, and its processing will be described with reference to Fig. 10.

[0033] Fig. 10 is a flowchart showing the processing of the isolated operation planning unit 7. In the first processing step S71 of the flow in Fig. 10, a matrix of the switch section is created from the input information. In the following explanation, the switch SW is the switch. Specifically, this processing is performed, for example, as follows. In addition, the result of the matrix creation in processing step S71 in Fig. 10 is illustrated in Fig. 11.

[0034] When the process starts, the isolated operation planning unit 7 extracts all switch numbers of the switches in the power distribution system L that it manages from the system information D1, and sets them in the first column C1 of the matrix of the switch section. After that, the isolated operation planning unit 7 extracts the switch numbers of all switches adjacent to the switches corresponding to the switch numbers in the first column from the system information D1, and sets them in the second column C2 of the matrix of the switch section, thereby identifying all the switch sections. After that, the isolated operation planning unit 7 assigns area numbers, such as area 1 (e.g., section L1) and area 2 (e.g., section L2), to each switch section, and sets them in the third column C3 of the matrix of the switch section. Through these processes, the switch numbers of the switches required to configure each switch section and the adjacent switch sections, i.e., the switch sections separated by the same switch, can be centrally identified by the area numbers. After that, the isolated operation planning unit 7 extracts the load capacity of each switch section from the system information D1, and sets them in the fourth column C4 of the matrix of the switch section. Thereafter, the islanding operation planning unit 7 extracts the distributed power supply capacity of each switch section from the system information D1, and sets this in the fifth column C5 of the switch section matrix. Thereafter, the islanding operation planning unit 7 extracts the presence or absence of a voltage source for each switch section from the system information D1, and sets this in the sixth column C6 of the switch section matrix. Thereafter, the islanding operation planning unit 7 identifies a switch section where an accident or equipment damage has occurred from the equipment damage information D2, and stores the switch section where an accident or equipment damage has occurred as 1 and the switch section where no accident or equipment damage has occurred as 0 in the seventh column C7 of the switch section matrix. If the equipment damage information D2 holds detailed location information of the accident or equipment damage, coordinate information of the accident or equipment damage linked to the distribution system L may be stored in the switch section where the accident or equipment damage has occurred.

[0035] Then, the isolated operation planning unit 7 extracts the power failure or power-on state of each switch section from the power failure information D3, and sets it as the 8th column C8 of the switch section matrix. Then, the isolated operation planning unit 7 extracts the load capacity and importance of each important load from the important load information D4, calculates the product, and takes the sum for the important loads present in each switch section, and sets it as the 9th column of the switch section matrix. The user can decide in advance whether or not to handle the importance, and if not, this process is not executed and the 9th column C9 of the switch section matrix is ​​set to all 0. Then, the isolated operation planning unit 7 uses the road network and impassable road information in the map information D5 to calculate the shortest time required for a power source vehicle, worker, etc. to move from the sales office to the nearest switch position constituting each switch section as the travel time, and sets it as the 10th column C10 of the switch section matrix.

[0036] A matrix of switch sections is created by the above series of processes in the first process step S71 of the flow in Fig. 10. In the 10th column of the matrix of switch sections, the travel time is calculated by dividing the length of the shortest route from the sales office to the switch constituting the switch section by an average travel speed, for example, 30 km / h. In addition, if the shortest route from the sales office to the switch constituting the switch section includes an impassable road section, the average travel speed while passing through the impassable road section is slowed down to, for example, 15 km / h to take into account the time required for a detour. The average travel speed, such as 30 km / h or 15 km / h, can be set in advance and is not limited to this.

[0037] According to the matrix created in Fig. 11, for each area that may be an isolated operation section, various conditions and problems during restoration in this section are comprehensively organized and summarized.

[0038] Next, in processing step S72 in Fig. 10, an isolated operation plan 1 (an isolated operation plan for a switch section that can be operated in isolated operation immediately) is created by optimization calculation. In the case of the power distribution system L in Fig. 2, the only switch sections that can be operated in isolated operation immediately are sections L1 and L3, and section L2 cannot be operated in isolated operation unconditionally because the fault state continues. For this reason, the isolated operation planning unit 7 performs optimization calculations with the following objective function and constraints, creates an isolated operation plan, and saves it as the isolated operation plan 1. This makes it possible to determine the switch sections that can be operated in isolated operation immediately.

[0039] The objective function for the optimization calculation is formulated as a problem to minimize the sum of the load capacity of the switch section in the power outage and the power outage duration for each switch section. This allows an islanding operation plan to be formulated to minimize the power outage damage. The load capacity of each switch section is calculated by taking the sum of the fourth column C4 and the ninth column C9 of the switch section matrix. This allows an islanding operation plan to be formulated to restore power preferentially according to its importance when considering important loads. The duration of the power outage state is, for example, 0 hours for a switch section that operates alone using a distributed power source such as a solar power generation system or a storage battery for a grid, assuming that power is restored immediately after the plan is formulated, the time required for the power source vehicle to move for a switch section that operates alone using a power source vehicle, and 72 hours for a switch section that does not restore power due to an islanding operation. Here, the power outage time for a switch section that operates alone using a distributed power source can be set in advance taking into account the possible duration of the islanding operation, and is not limited to 0 hours. In addition, the duration of power outage in the switchgear section where power is not restored due to isolated operation can be set in advance as the maximum period for which power restoration will be attempted according to this plan, and is not limited to 72 hours.

[0040] The optimization calculations are mainly limited by the following three constraints. The first is to not perform isolated operation in switchgear sections where an accident or equipment failure has occurred. This makes it possible to prevent re-occurrence of power outages or damage from electric shock caused by performing isolated operation despite an accident or equipment failure. The presence or absence of an accident or equipment failure within a switchgear section is determined by extracting it from C7, the seventh column of the switchgear section matrix.

[0041] The second is that a switch section without a voltage source will not operate independently unless it is connected to a switch section with a voltage source. This makes it possible to prevent a situation in which a system intended for isolated operation does not have a voltage source and power cannot be restored. The presence or absence of a voltage source in each switch section is determined by extracting it from C6, the sixth column of the switch section matrix. In addition, with regard to the interconnection of switch sections, it is assumed that adjacent switch sections will always operate interconnected when operating independently of each other. Adjacent switch sections are identified and determined from C2, the second column of the switch section matrix.

[0042] The third condition is that the sum of the load capacities within the switchgear section that is interconnected and operates independently is equal to or less than the sum of the distributed power supply capacities within the switchgear section. If power supply vehicles are deployed in one or more sections of the switchgear section, the sum of the sum of the distributed power supply capacities within the switchgear section and the sum of the capacities of the power supply vehicles is compared with the sum of the load capacities within the switchgear section. This allows for supply and demand matching within the isolated operation area to be taken into account, making it possible to prevent re-occurrence of blackouts. The load capacity and distributed power supply capacity within each switchgear section are extracted from the fourth column C4 and the fifth column C5 of the switchgear section matrix, respectively. For the capacity of the power supply vehicles, capacity information according to the type of power supply vehicle to be deployed is extracted from resource information D6.

[0043] If it is necessary to change the inputs when performing the optimization calculation, in processing step S73 of Fig. 10, the seventh column C7 of the switch section matrix is ​​rewritten to all 0. This allows us to assume the system state after restoration work in which all accidents and equipment failures have been removed.

[0044] Furthermore, if it becomes necessary to add constraints in performing optimization calculations, the switchgear sections to be operated independently in the islanding operation plan 1 and the switchgear sections in which power generation cars of each capacity are deployed are fixed in the plan as the switchgear sections to be operated independently and the switchgear sections in which power generation cars are deployed, respectively, in processing step S74 in Fig. 10. This makes it possible to select a power restoration means that minimizes power outage damage when selecting to restore power by reconnecting to the grid or by islanding operation after recovery work for an accident or equipment failure for a switchgear section that does not restore power after islanding operation is performed according to the islanding operation plan 1.

[0045] Then, in processing step S75 in Fig. 10, the islanding operation plan making unit 7 changes the input and adds constraints as shown below, performs optimization calculation again, makes an islanding operation plan after the restoration work, and saves it as an islanding operation plan 2 (an islanding operation plan for a switch section that can be operated in an isolated manner after the restoration work for the accident or damaged equipment). As a result, the restoration work planning unit 8 described later can consider islanding in addition to system reconnection as a means of restoring power after the restoration work for the accident or damaged equipment, and can make an efficient restoration work plan that minimizes the power outage damage. In the case of the power distribution system L in Fig. 2, the switch section that can be operated in an isolated manner after the restoration work for the accident or damaged equipment is the section L2 and the consumer Ld8, and as a result, islanding operation plans are made for all sections.

[0046] The restoration work planning unit 9 is a functional unit that creates a restoration work plan based on the system information D1, the equipment damage information D2, the power outage information D3, the map information D4, the important load information D5, the resource information D6, the isolated operation plan received from the isolated operation planning unit 7, and the work required time information D8, and the processing thereof is described in FIG. 12.

[0047] Fig. 12 is a flowchart showing the processing of the restoration work planning unit 9. In the first processing step S91 of the flow in Fig. 12, the restoration work planning unit 9 extracts the isolated operation plan 2 and a matrix of the switch section (illustrated in Fig. 11) from the isolated operation planning unit 7.

[0048] Thereafter, in process step S92, the restoration operation planning unit 9 performs optimization calculations having the following objective functions and constraints, and saves the results as a restoration operation plan.

[0049] The objective function for the optimization calculation is to calculate the sum of binary variables representing the state of each switch section, 0 if power is restored and 1 if power is out, for all switch sections and for each time step, and to formulate the problem as minimizing this. The time step can be set by the user as desired, for example 1 minute.

[0050] The optimization calculation is mainly limited by the following six constraints: First, the same worker or work crew can only perform one task or movement per time step.

[0051] The second condition is that the number of time steps that the same worker or work team stays at one equipment damage location is equal to or greater than the number of time steps that corresponds to the work required time for that equipment damage. The type of equipment damage at each equipment damage location is extracted from the equipment damage type D23 of the equipment damage information D2, and the corresponding work required time is extracted from the work required time information D8.

[0052] The third condition is that the number of time steps for the same worker or work crew to travel between two damaged facility locations must be equal to or greater than the number of time steps corresponding to the travel time between the two locations. The travel time between the two locations is calculated by extracting the length of the shortest route between the two locations from the map information D5 and dividing it by an average travel speed, such as 30 km / h. In addition, if the shortest route includes an impassable road section, the average travel speed while passing through the impassable road section is slowed down to, for example, 15 km / h, to take into account the time required for a detour. The average travel speed, such as 30 km / h or 15 km / h, can be set in advance, and is not limited to this.

[0053] The fourth is that power is not restored to switch sections with one or more fault points. The fifth is that, at each time step, among the switch sections from which all fault points have been removed, switch sections in the energized state in C8 in the eighth column of the switch section matrix, and switch sections adjacent to switch sections that reach any of the energized switch sections in C8 in the eighth column of the switch section matrix when tracing the energized adjacent switch sections, are to be restored to power (this is called constraint A).

[0054] The sixth is that, among the switch sections without fault points, the switch sections scheduled for isolated operation in the isolated operation plan 2 must be restored to power (constraint B).

[0055] In addition, when executing the fifth constraint, in processing step S93, for a switch section in which power is restored because constraint A is satisfied for the first time at a certain time step, that time step is stored in the 10th column C10 of the switch section matrix, and the power restoration means, such as “power restoration by grid reconnection”, is stored in the 11th column.

[0056] Furthermore, in executing the sixth constraint, in processing step S94, for a switch section in which power is restored by satisfying constraint B for the first time in a certain time step, that time step is stored in the 10th column C10 of the switch section matrix, and a power restoration method such as "power restoration by isolated operation" is stored in the 11th column C11. At this time, if the time step in which constraint A was first satisfied is stored in the 10th column C10 of the switch section matrix, the time steps in which each constraint was first satisfied are compared, and the smaller time step is stored. The 11th column of the switch section matrix stores the power restoration method corresponding to the constraint that was first satisfied in the time step stored in the 10th column C10.

[0057] The screen output unit 10 is a functional unit that selects and displays the contents to be displayed on the display device 11, and the processing thereof will be described with reference to Fig. 13. Fig. 13 is a flowchart showing an example of the processing of the screen output unit 10. The display device 11 is configured to include, for example, a liquid crystal panel or an organic EL (Electro Luminescence) panel, and displays the display contents selected by the operator.

[0058] In the process of the screen output unit 10 in FIG. 13, in process step S11, a selection input of an item to be displayed on the screen is accepted, and in process step S12, the selected item is displayed.

[0059] Next, a configuration example of the screen 110 in Fig. 14 will be described. The screen is configured with a plurality of panes 111, 112, and 113, which are small areas divided into the screen. The display content selected by the screen output unit 10 is displayed on the screen 110 displayed on the display device 11.

[0060] The display content selection pane 111 is a display for allowing the operator to operate and select the display content to be selected and processed by the screen output unit 10. As a result, the display content selected in the display content selection pane 111 is displayed in the other panes. Selectable factors include an isolated operation plan, power supply area, switch status, fault point information, map, restoration work plan, restoration time step, and power restoration means. When these items are selected, the selection input of the items to be displayed on the screen is accepted and processed in processing step S11 of the screen output unit 10 in FIG. 13. Thereafter, in processing step S12 of the screen output unit 10 in FIG. 13, a display screen according to the selected content is displayed in the map pane 112 and the plan information pane 113.

[0061] The map pane 112 displays the islanding operation plan and a map of roads, houses, etc., whose positional relationships correspond to the plan, in a superimposed manner. The islanding operation plan is a system diagram in which each system is colored so that it can be identified, and on the system diagram, for example, switches in the open state and closed state are displayed in different colors to indicate the switch state in the system, and the location of the accident point is displayed with a symbol such as a cross. On the map, for example, the area to which power is supplied by islanding operation is displayed in color.

[0062] The plan information pane 113 displays specific details of the cause selected in the display content selection pane 111. The example in Fig. 14 shows a detailed display of information when a restoration work plan, restoration time steps for each switch section, and power restoration means are selected. The restoration work plan is a diagram showing the work and movements that each worker or work team will perform in each time period.

[0063] The screen output unit 10 preferably displays, for example, buttons, pull-downs, etc., in a display content selection pane 111 (see FIG. 13) on the display device 11, which will be described later. When the operator presses or selects one or more buttons, pull-downs, etc. displayed on the display device 11, the screen output unit 10 outputs the display content selected by the operator to another pane displayed on the display device 11.

[0064] At this time, the display contents that can be selected include, for example, the power supply area, switch status, accident point information, maps of roads and houses, etc. based on each of the isolated operation plans 1 and 2 created by the isolated operation planning unit 7, the restoration work plan created by the restoration work planning unit 9, and the restoration time steps and restoration means for each switch section.

[0065] The present invention is not limited to the above-described embodiment, and includes various modified examples. For example, the above-described embodiment has been described in detail to clearly explain the present invention, and is not necessarily limited to those having all of the configurations described. It is possible to replace a part of the configuration of one embodiment with the configuration of another embodiment, and it is also possible to add the configuration of another embodiment to the configuration of one embodiment. In addition, it is also possible to add, delete, or replace a part of the configuration of each embodiment with another configuration.

[0066] The above configurations, functions, processing units, processing means, etc. may be realized in part or in whole by hardware such as an integrated circuit. The above configurations, functions, etc. may be realized by software by a processor interpreting and executing a program that realizes each function. Information such as the program, table, file, etc. that realizes each function can be stored in a recording device such as a memory, a hard disk, or an SSD (Solid State Drive), or a recording medium such as a flash memory card or a DVD (Digital Versatile Disk).

[0067] In each embodiment, the control lines and information lines are those that are considered necessary for the explanation, and not all control lines and information lines in the product are necessarily shown. In reality, it may be considered that almost all components are connected to each other. [Explanation of symbols]

[0068] 7: Isolated operation planning department 9: Recovery Work Planning Department 10: Screen output section 11:Display device 12: Recovery decision support device 13: Input device DB: Mass storage unit D1: Lineage information D11: Switch number column D12: Adjacent switch number column D13: Load capacity field D14: Customer number field D15: Dispersed power source number field D16: Distributed power supply capacity column D17: Voltage source presence / absence information field D2: Facility damage information D21: Equipment damage number column D22: Switch number column D23: Equipment damage type column D3: Power outage information D31: Switch number column D32: Power outage flag column D4: Important load information D41: Customer number field D42: Load capacity field D43: Importance column D5: Map information D6: Resource Information D61: Resource type column D62: Number of resources D7: Islanding operation planning section D8: Work time information D81: Equipment damage type column D82: Recovery work time column L: Distribution system 110: Screen 111: Display content selection pane 112: Map pane 113: Plan Information Pane

Claims

1. A restoration decision-making support device for reconnecting a power system section that has been disconnected due to a power system accident to the power system, comprising: An isolated operation planning unit that defines a switch section divided by adjacent switches for the separated power system section, and creates an isolated operation plan for at least the switch section having a distributed power source therein or a power supply vehicle installed therein; A restoration work planning unit is provided for formulating a restoration work plan for a switch section in which an accident or damaged equipment exists in the power system, The isolated operation planning unit develops an isolated operation plan that presents a switch section that can be operated independently after an accident or recovery work for damaged equipment, The restoration work planning unit is configured to formulate restoration work plans for accidents and damaged equipment that minimize power outage damage based on the isolated operation plan, and to formulate restoration time steps and power restoration means for each switch section.

2. 2. The recovery decision support device according to claim 1, The recovery decision-making support device is characterized in that the isolated operation planning unit formulates a first isolated operation plan indicating a switch section that can be operated independently immediately, and a second isolated operation plan indicating a switch section that can be operated independently after restoration work.

3. A recovery decision support device as claimed in claim 1, The restoration decision-making support device is characterized in that the restoration work planning unit formulates a restoration work plan for the accident or damaged facilities that minimizes power outage damage based on the isolated operation plan.

4. A recovery decision support device as claimed in claim 1, The restoration decision-making support device is characterized in that the restoration work planning unit plans restoration time steps and power restoration means for each switch section based on the isolated operation plan.

5. A recovery decision support device as claimed in claim 3, The restoration decision-making support device is characterized in that the restoration work planning unit formulates a restoration work plan by optimization calculation in order to minimize power outage damage.

6. 2. The recovery decision support device according to claim 1, a display output unit that outputs, on a screen, the isolated operation plan drawn up by the isolated operation planning unit and the restoration work plan created by the restoration work planning unit.

7. A recovery decision support device as claimed in claim 6, The recovery decision-making support device is characterized in that the screen output unit outputs on a screen a first isolated operation plan indicating a switch section that can be operated independently immediately, which has been devised by the isolated operation planning unit, and a second isolated operation plan indicating a switch section that can be operated independently after restoration work.

8. A recovery decision support device as claimed in claim 6, The restoration decision-making support device is characterized in that the screen output unit outputs on a screen the restoration work plan drawn up by the restoration work planning unit, the restoration time steps for each switch section, and the power restoration means thereof.

9. A recovery decision support device as claimed in claim 8, The recovery decision support device, wherein the screen output unit outputs the recovery work plan drawn up by the recovery work planning unit on a screen.

10. A recovery decision support device as claimed in claim 8, The restoration decision-making support device is characterized in that the screen output unit outputs on a screen the restoration time steps and power restoration means for each switch section planned by the restoration work planning unit.

11. 1. A restoration decision support method for reconnecting a power system section that has been disconnected due to a power system accident to the power system, the method being implemented using a computer, the method comprising: For the isolated power system section, a switch section divided by adjacent switches is defined, and an isolated operation plan is prepared for the switch section having at least a distributed power source therein or a power supply vehicle installed as an isolated operation section; Develop a restoration work plan for the switch section of the power system where an accident or damaged equipment exists, and Develop an isolated operation plan that shows switchgear sections that can be operated independently after an accident or restoration work for damaged equipment, A restoration decision-making support method characterized by formulating a restoration work plan for accidents and damaged equipment that minimizes power outage damage based on the isolated operation plan, as well as restoration time steps and power restoration means for each switch section.

12. 12. A restoration decision support method according to claim 11, comprising: The isolated operation plan includes a first isolated operation plan indicating a switch section that can be immediately operated independently; A restoration decision-making support method comprising: formulating a restoration work plan including a second isolated operation plan indicating a switch section that can be operated independently after restoration work, and including procedures and resources for the restoration work based on the second isolated operation plan.

13. The recovery decision support method according to claim 11, comprising: A restoration decision-making support method characterized by creating a restoration plan that takes into account the load capacity of a switch section that can restore power outage through isolated operation and connection to the power grid or an isolated operation section, and the required time required for the switch section to restore power outage, in accordance with the isolated operation plan, and minimizes the sum of the product of the load capacity and the required time for all switch sections.

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