Estimation device, estimation method, and program

Abstract

Provided is an estimation device for estimating a position of occurrence of an accident on a power-feeding line in a DC power-feeding system in which a plurality of locations, each provided with a power-feeding device, are connected with a power-feeding line, the estimation device comprising: an information acquisition unit that acquires information from each location when the accident has occurred; and an estimation unit that estimates the position of occurrence of the accident in the power-feeding line by comparing the information between locations.

Description

[Technical Field]

[0001] The present invention relates to a technique for estimating the location of a fault such as a short circuit. [Background technology]

[0002] In telecommunications buildings, data centers, etc., high-voltage DC power supply systems are being introduced to reduce power loss throughout the system and to save energy. In DC power supply systems, power is supplied (distributed) at a high voltage of, for example, 380V.

[0003] Conventional DC power supply systems are generally used indoors. Indoor DC power supply systems use cables up to 60 meters long to supply power. Furthermore, power is supplied in one direction only, to loads such as ICT equipment. [Prior art documents] [Non-patent literature]

[0004] [Non-Patent Document 1] IEEJ2021 General Lecture 6-056 "Study on Short-Circuit Protection Methods for Outdoor DC Power Supply Systems" Hanaoka et al. Summary of the Invention [Problem to be solved by the invention]

[0005] It is expected that outdoor DC power supply systems that supply DC power via outdoor power lines will be introduced in the future (for example, Non-Patent Document 1). It is also expected that multiple bases each equipped with power supply converters will be connected in an n-to-n configuration, enabling bidirectional power supply between the bases.

[0006] Outdoor DC power supply systems may need to supply power to loads located several kilometers away (for example, up to 4 km). In such cases, the impedance (resistance and inductance components) becomes much larger than in conventional indoor DC power supply systems.

[0007] Accidents such as short circuits can occur in the power feeder lines of a DC power supply system. A short circuit occurs when the positive and negative power feeder lines are connected with a small resistance. When a short circuit occurs, a large current flows through the power feeder lines.

[0008] In conventional indoor DC power supply systems, if a short circuit occurs, the point of the short circuit can be easily identified visually. However, in the outdoor DC power supply system described above, the distance between bases (the length of the power supply lines) is long, so if a short circuit occurs, it is difficult to immediately determine where the short circuit is located. This problem is not limited to short circuits, but is common to all accidents on power supply lines (including ground faults, etc.).

[0009] The present invention has been made in consideration of the above points, and aims to provide a technique for estimating the location of a fault in a power supply line in a DC power supply system in which multiple base stations are connected by power supply lines. [Means for solving the problem]

[0010] According to the disclosed technology, there is provided an estimation device for estimating a location of a fault on a power supply line in a DC power supply system in which a plurality of bases, each equipped with a power supply device, are connected by a power supply line, the estimation device comprising: an information acquisition unit that acquires information from each base when the accident occurs; an estimation unit that estimates a location of the fault in the power feeder line by comparing the information between bases, The information is the resistance value of a fuse provided in a power supply line within the site, or the amount of electricity obtained by integrating the waveform of the current value flowing through the power supply line within the site over time. An estimation device is provided. [Effects of the Invention]

[0011] According to the disclosed technology, it is possible to estimate the location where a fault has occurred in a power feeder in a DC power feeder system in which a plurality of bases are connected by power feeders. [Brief explanation of the drawings]

[0012] [Figure 1] 1 is a diagram illustrating an example of the overall configuration of a DC power supply system. [Figure 2] FIG. 1 is a diagram illustrating an example of a DC power supply system in one building. [Figure 3] FIG. 1 is a diagram illustrating an example of a DC power supply system that connects bases with outdoor power supply lines. [Figure 4] FIG. 1 is a diagram for explaining an overview of an embodiment. [Figure 5] FIG. 1 is a diagram for explaining an overview of an embodiment. [Figure 6] FIG. 1 illustrates an example of the configuration of an estimation device. [Figure 7] 10 is a flowchart illustrating the operation of the estimation device. [Figure 8] FIG. 10 is a diagram for explaining an example of calculation between two locations. [Figure 9] FIG. 10 is a diagram for explaining an example of calculation among three locations. [Figure 10] FIG. 2 illustrates an example of a hardware configuration of the apparatus. DETAILED DESCRIPTION OF THE INVENTION

[0013] Hereinafter, an embodiment of the present invention (the present embodiment) will be described with reference to the drawings. The embodiment described below is merely an example, and the embodiment to which the present invention is applied is not limited to the following embodiment.

[0014] In the following embodiments, a short circuit will be described as an example of an accident that occurs in a power supply line, but the technology according to the present invention can also be applied to accidents other than a short circuit (for example, a ground fault).

[0015] (Example of overall system configuration) An example of the overall configuration of a DC power supply system according to this embodiment is shown in Fig. 1. The DC power supply system shown in Fig. 1 supplies power at a high voltage (for example, 380 V) over a long distance (for example, about 4 km) using an outdoor power supply line.

[0016] In the example of FIG. 1, there are three bases, namely, Building A, Building B, and Building C, and each building is equipped with a power supply converter and is capable of supplying power to the other buildings. In other words, bidirectional power supply is possible between any two of the three bases. In the example of FIG. 1, Building A is a base building such as a communications building, and Buildings B and C are buildings such as evacuation shelters. The power supply converters may also be called power supply devices. However, the term "power supply device" is not limited to power supply converters.

[0017] As shown in Figure 1, each base is equipped with power generation facilities such as photovoltaic (PV) generators and wind power generators, as well as loads such as EVs and storage batteries, and converters enable bidirectional power interchange between bases.

[0018] (About the assignment) The following describes in detail the problems that the technology according to the present invention aims to solve. First, for comparison, an example of a conventional indoor (inside a communication building) DC power supply system is shown in Fig. 2. As shown in Fig. 2, this DC power supply system includes AC 200V 1, a rectifier 2, a current distribution device 3, and a load 4 (device using DC 380V).

[0019] As shown in Figure 2, power is supplied one-way from the rectifier 2 to the load 4 via a cable up to about 60 m long. This allows stable transmission of power to the load 4, such as ICT equipment.

[0020] Figure 3 shows a DC power supply system corresponding to the area enclosed by the dotted line in Figure 1. As shown in Figure 3, Building A (a communications building) is equipped with an AC 200V power supply 1A, a bidirectional inverter 2A, a power supply converter A (10A), and an input / output panel 20A. Building B is equipped with an input / output panel 20B, a power supply converter 10B, and a load device 30B.

[0021] Building A and building B are connected by an outdoor power feeder that can supply power in both directions, and the length of this feeder is, for example, up to 4 km.

[0022] When power is fed over a long distance as in the configuration of FIG. 3, the impedance (resistance component and inductance component) is about two orders of magnitude larger than the impedance in the configuration shown in FIG.

[0023] If a short circuit occurs in the power feeder between Building A and Building B, the resistance of the power feeder will drop rapidly, causing a large current to flow through the power feeder. This can cause fuses in the buildings to blow, or the cable at the short-circuit point to burn out.

[0024] When power is supplied from one base to another via outdoor power lines, as in the outdoor DC power supply system shown in Figure 3, power may be supplied over a distance of several kilometers, such as up to 4 km. In such cases, there is a problem that it is not possible to visually confirm where the short circuit has occurred, and workers cannot rush to the accident site immediately. Note that this type of problem can also occur in indoor DC power supply systems when long power lines are used.

[0025] (System configuration example according to the embodiment) In order to solve the above problem, in this embodiment, as shown in FIG. 4, an estimation device 100 connected to a network (communication line) of a DC power supply system is provided.

[0026] Fig. 4 shows an example of a DC power supply system having two bases, Building A and Building B, similar to the example of Fig. 3. Fig. 4 also shows X capacitors 40A and 40B and fuses 50A and 50B to explain the flow of current when a short circuit occurs.

[0027] The X capacitor is a capacitor provided between the positive power supply line and the negative power supply line. The X capacitor is provided inside the power supply capacitor. The fuse is provided, for example, in the power supply line between the output point of the power supply capacitor (the output point on the outdoor power supply line side) and the input / output panel 20. A fuse may also be provided inside the input / output panel 20.

[0028] A fuse normally has a low resistance, but when a large current flows through it, its resistance increases, and once the current exceeds a certain value, it melts within a set time. The relationship between the current and resistance of a fuse is nonlinear, and the characteristics differ depending on the type of fuse.

[0029] Protection from short circuits is provided by the gate block (GB) and fuses provided in the power supply converter. The GB of the power supply converter detects overcurrent during a short circuit and stops the output of the power supply converter within a few microseconds to a few milliseconds. However, even if the GB can stop the output in a short time, in the event of a short circuit, the charge accumulated in the X capacitor outside the GB (on the power supply line side) will become a large current that flows through the power supply line, which can cause the fuse to blow.

[0030] An example of an event that may occur will be described based on the configuration shown in Figure 4. For example, if a short circuit occurs at point C, which is closer to building B than building A, power supply converters 10A and 10B will detect an overcurrent and immediately stop output, but the charge in X capacitors 40A and 40B will mainly flow to the short-circuit point.

[0031] At this time, a larger current flows through fuse 50B in Building B, which has a smaller impedance (shorter distance) to the short-circuit point, than through fuse 50A in Building A, so fuse 50B either blows or, just before it blows, becomes highly resistant (several ohms), and large values ​​are observed for both the current and voltage.

[0032] On the other hand, fuse 50A in building A, which has a large impedance (long distance) to the short-circuit point, does not blow, and the resistance value remains, for example, 0 Ω, and both the current and voltage are smaller than in building B.

[0033] Based on the above-described behavior, the estimating device 100 estimates the location where the short circuit occurred based on the information collected from each location.

[0034] As shown in FIG. 4, the number of bases in the DC power supply system is two, which is an example. The number of bases may be three or more. FIG. 5 shows an example of the configuration of a DC power supply system when the number of bases is three. In the configuration shown in FIG. 5, the estimation device 100 collects information from three bases, namely, building A, building B, and building C, and compares this information to estimate the location where the short circuit occurred (e.g., which part of the power supply line is close to which base the short circuit occurred).

[0035] (Configuration of Estimation Device 100) Fig. 6 shows an example of the configuration of an estimation device 100 according to this embodiment. As shown in Fig. 6, the estimation device 100 includes an information acquisition unit 110, an estimation unit 120, an output unit 130, and a data storage unit 140. The operation of each unit is outlined below.

[0036] The information acquisition unit 110 acquires information from each location. When making an estimation based on the resistance value of a fuse, the information acquisition unit 110 acquires the resistance value of the fuse from each location. When making an estimation based on a current value, the information acquisition unit 110 acquires the current value from each location. This information acquisition is triggered by detecting a short circuit. The information acquisition unit 110 acquires information based on the current that flows when a short circuit occurs.

[0037] The above information is an example, and the information acquisition unit 110 may acquire additional information other than the above information.

[0038] The estimation unit 120 estimates the location (point) where the short circuit occurred based on the information acquired by the information acquisition unit 110 and the information stored in the data storage unit 140 (such as the equipment configuration including the geographical location of the power supply line).

[0039] The output unit 130 outputs the estimation result obtained by the estimation unit 120. The output information may be, for example, an image in which a mark indicating a point on the route of the power feeder line indicating the short-circuit point is attached on a map including an area where the power feeder line of the DC power supply system is laid, or may be text information indicating the short-circuit point (e.g., 1 km from Building A), or other information. Furthermore, the output unit 130 may output information other than the estimation result together with the estimation result.

[0040] Furthermore, the output unit 130 may include a display and display the output information on the display, or the output unit 130 may include a web server and display the output information on a remote terminal via a network.

[0041] (Example of operation of the estimation device 100) Next, an example of the operation of the estimation device 100 will be described along the steps of the flowchart in Fig. 7. After the description of the flowchart in Fig. 7, an example of a specific estimation method will be described.

[0042] In S101 , basic data on a DC power supply system for which a short-circuit point is to be estimated is input to the estimation device 100 , and the basic data is stored in the data storage unit 140 .

[0043] The basic data includes, for example, the X capacitor capacity, cable impedance, fuse melting characteristics, power network configuration, equipment configuration, and specifications of the power supply converter at each site.

[0044] By storing such data in the data storage unit 140, when a short circuit occurs, the worker can quickly check the information he or she wants to know, even if the information is not used to estimate the short circuit point. Note that information other than the information used to estimate and output the short circuit point may not be input in S101.

[0045] In S102, for example, the information acquisition unit 110 in the estimation device 100 detects that an accident (a short circuit in this case) has occurred in the DC power supply system. The detection of the occurrence of a short circuit may be performed by any method.

[0046] For example, the occurrence of a short circuit may be detected by the estimation device 100 receiving a signal indicating that the GB of the power supply converter 10 at any of the bases has operated. Alternatively, the occurrence of a short circuit may be detected by the estimation device 100 receiving a signal indicating that a short circuit has occurred from a monitoring device that monitors the DC power supply system.

[0047] In S103, the information acquisition unit 110 acquires information necessary for estimating the short-circuit location from each location. The information acquired here is, for example, the resistance value between both ends of the fuse from the time immediately before the short-circuit occurred to a certain time after the short-circuit occurred, and the current value of the power supply line between the power supply converter and the input / output panel. The acquired resistance value and current value may be values ​​at a certain time interval, or may be waveforms over a continuous time period. Furthermore, in addition to or instead of the current value, an electric quantity may be acquired. The electric quantity may be calculated from the acquired current value.

[0048] Furthermore, the acquired information may include information that is not used for automatic estimation of the short-circuit point. For example, in addition to the resistance value and current value, the acquired information may include PV power, storage battery SoC, load capacity, converter error log, converter output voltage value, etc. By outputting this information from the output unit 130, the operator can understand the converter error log, etc. in addition to the automatic estimation result, and can therefore confirm the accuracy of the estimation result, etc. The information acquired by the information acquisition unit 110 is stored in the data storage unit 140.

[0049] In S104, the estimation unit 120 compares the resistance values ​​of the fuses acquired from the respective locations between the locations.

[0050] In S105, the estimation unit 120 determines whether the resistance values ​​of the fuses differ between the locations. When there are three or more locations, the difference in the resistance values ​​of the fuses between the locations means that there is at least one location whose resistance value differs from that of the other locations. Furthermore, the "different resistance values" may mean, for example, that when there are R1 and R2, |R1-R2| is equal to or greater than a threshold value. In other words, slight differences may be considered to be the same.

[0051] If the determination in S105 is Yes (the resistance values ​​are different between the bases), the process proceeds to S106, and if the determination in S105 is No (the resistance values ​​are the same between the bases), the process proceeds to S107.

[0052] In S106, the estimation unit 120 estimates the location where the short circuit has occurred based on a comparison of fuse resistance values ​​between the locations. In S107, the estimation unit 120 estimates the location where the short circuit has occurred based on a comparison of current values ​​(or electrical quantities) between the locations. Specific examples of S106 and S107 will be described later.

[0053] In S108, the output unit 130 displays the short-circuit point on the path of the power feeder in the DC power supply system. In addition, in S108, information acquired in S103 that is not used for estimation (e.g., converter error value) may be additionally displayed. The position of the short-circuit point on the path of the power feeder displayed in S108 is an approximate position.

[0054] In the above flow example, both the resistance value and the current value (or the amount of electricity) of the fuse are used, but this is just one example. Estimation may be performed using only the resistance value of the fuse, or only the current value (or the amount of electricity). Furthermore, the location of the short circuit may be estimated from information other than the resistance value, the current value, and the amount of electricity.

[0055] (Example) Next, a specific example of estimating the location of a short circuit point will be described with reference to Figs. 8 and 9. Here, it is assumed that the fuses at each site are the same. First, the description will be made with reference to Fig. 8. Like Fig. 4, Fig. 8 shows a DC power supply system with two sites.

[0056] <Two-site case: Estimation based on resistance values> Assume that after a short circuit occurs, information acquisition unit 110 acquires a resistance value of 3 Ω for fuse 50A in building A and a resistance value of 1 Ω for fuse 50B in building B. These resistance values ​​may be the maximum resistance values ​​during the period in which the short circuit occurs (the period from immediately before the occurrence to a certain time after the occurrence), or may be the resistance value (a value that can be estimated to be the above maximum value) measured at the time of the short circuit (for example, immediately after the short circuit is detected).

[0057] The higher the resistance of the fuse, the larger the current that can be estimated to have flowed through it. A large current means that the distance (impedance) between the short circuit point and the building where the fuse is located is small.

[0058] Therefore, the estimation unit 120 estimates that the larger the resistance value, the closer the position of the short-circuit point is to the building where the resistance value is measured.

[0059] As an example, between building A and building B, as shown in Figure 4, point A (a point close to building A), point B (near the center between buildings A and B), and point C (a point close to building B) are pre-determined depending on the distance from buildings A / B.

[0060] The estimation unit 120 estimates that a short circuit has occurred at point A because the resistance value of fuse 50A is 3Ω and the resistance value of fuse 50B in building B is 1Ω.

[0061] In addition to (or instead of) the magnitude relationship of the resistance values ​​as described above, the position may be estimated using the magnitude (amount of change) of the resistance value and information on whether or not the fuse has blown. Regarding whether or not the fuse has blown, it can be determined that the fuse has blown when the resistance value is very large (infinite or greater than a threshold value).

[0062] For example, if the resistance value at a certain point does not change due to the occurrence of a short circuit, the estimation unit 120 estimates that the point where the short circuit occurred is far from that point (that is, close to the opposite point).

[0063] Furthermore, if the resistance value at a certain location becomes larger than normal due to the occurrence of a short circuit, the estimation unit 120 determines the location where the short circuit occurred by comparing it with the resistance values ​​at other locations.

[0064] Furthermore, if it is determined that a fuse at a certain location has blown, the estimation unit 120 determines that the point where the short circuit occurred is close to that location. For example, if fuse 50A in building A has blown, the estimation unit 120 can estimate that the point where the short circuit occurred is location A in FIG. 8.

[0065] <Two-site case: Estimation based on current value (or electricity quantity)> Assume that after a short circuit occurs, the information acquisition unit 110 acquires a current value of 300 A for building A and a current value of 100 A for building B. These current values ​​may be the maximum current values ​​(peak values) during the period in which the short circuit occurs (the period from immediately before the occurrence to a certain time after the occurrence), or may be the current values ​​(values ​​that can be estimated to be the above maximum values) measured at the time of the short circuit (for example, immediately after the short circuit is detected).

[0066] The current value may be a measurement value anywhere on the power supply line between the power supply converter 10 and the input / output panel 20, and may be, for example, the output current value of the power supply converter 10.

[0067] A large current value at a certain point means that the distance (impedance) between the short-circuit point and that point is small.

[0068] Therefore, the estimation unit 120 estimates that the larger the current value, the closer the location of the short-circuit point is to the building where the current value was measured. As with the resistance value, the location of the short-circuit point may be roughly estimated using a predetermined point or may be calculated as follows:

[0069] Here, the current measured in Building A is I A The current measured in building B is I B Furthermore, let L be the length of the power feeder line between Building A and Building B, DA be the distance from Building A to the short-circuit point (the distance along the power feeder line), and DB be the distance from Building B to the short-circuit point (the distance along the power feeder line).

[0070] The estimation unit 120 calculates "1 / I A :1 / I B DA and DB are calculated as follows: DA = (L × I B ) / (I A +I B ), DB=(L×I A ) / (I A +I B ) can be calculated as

[0071] For example, L=4km, I A =300A, I B = 100A, the calculation can be done as DA = 1km and DB = 3km.

[0072] In the above example, the peak current value was used, but the amount of electricity during the period when the short circuit occurred (the period from just before the occurrence to a certain time after the occurrence) may also be used. The amount of electricity can be obtained by integrating the waveform of the acquired current value over time.

[0073] The estimation of the short circuit point location when using electrical quantities is the same as when using current values. For example, if the electrical quantity measured in building A is A The amount of electricity measured in building B is C B Then, the estimation unit 120 calculates "1 / CA :1 / C B DA and DB can be calculated based on the relationship "=DA:DB".

[0074] <Three-site case: Estimation based on resistance values> Next, a description will be given with reference to Fig. 9. Fig. 9 shows a three-point DC power supply system, similar to Fig. 5.

[0075] Assume that after a short circuit occurs, information acquisition unit 110 acquires the resistance values ​​of fuse 50A in building A as 3 Ω, fuse 50B in building B as 1 Ω, and fuse 50C in building C as 1 Ω. Note that these resistance values ​​may be the maximum resistance values ​​during the period in which the short circuit occurs (the period from immediately before the occurrence to a certain time after the occurrence), or may be the resistance values ​​(values ​​that can be estimated to be the above maximum values) measured at the time of the short circuit (for example, immediately after the short circuit is detected).

[0076] The higher the resistance of the fuse, the larger the current that can be estimated to have flowed through it. A large current means that the distance (impedance) between the short circuit point and the building where the fuse is located is small.

[0077] Therefore, the estimation unit 120 estimates that the larger the resistance value, the closer the position of the short-circuit point is to the building where the resistance value is measured.

[0078] As an example, between building A and building B, point A (a point close to building A), point B (near the center between buildings A and B), and point C (a point close to building B) are determined in advance according to the distance from building A / B, as shown in Fig. 5. Similarly, points E, F, etc. may be determined in advance for the connection point of the power feed line between building A and building B and the power feed line extending from building C, and for the power feed line between building A and building B, according to the distance from building C, for example.

[0079] The estimation unit 120 estimates that a short circuit has occurred at point A because the resistance value of fuse 50A in building A is 3Ω, the resistance value of fuse 50B in building B is 1Ω, and the resistance value of fuse 50C in building C is 1Ω.

[0080] In addition to (or instead of) the magnitude relationship of the resistance values ​​as described above, the position may be estimated using the magnitude (amount of change) of the resistance value and information on whether or not the fuse has blown. Regarding whether or not the fuse has blown, it can be determined that the fuse has blown when the resistance value is very large (infinite or greater than a threshold value).

[0081] For example, if the resistance value at a certain location does not change due to the occurrence of a short circuit, the estimation unit 120 estimates that the point where the short circuit occurred is far from that location (that is, close to a location other than that location).

[0082] Furthermore, if the resistance value at a certain location becomes larger than normal due to the occurrence of a short circuit, the estimation unit 120 determines the location where the short circuit occurred by comparing it with the resistance values ​​at other locations.

[0083] Furthermore, if it is determined that a fuse at a certain location has blown, the estimation unit 120 determines that the point where the short circuit occurred is close to that location. For example, if fuse 50A in building A has blown, the estimation unit 120 can estimate that the point where the short circuit occurred is location A in FIG. 9.

[0084] <Three-site case: Estimation based on current value (or electricity quantity)> Assume that after a short circuit occurs, the information acquisition unit 110 acquires a current value of 300 A for building A, a current value of 100 A for building B, and a current value of 100 A for building C. These current values ​​may be the maximum current values ​​(peak values) during the period in which the short circuit occurs (the period from immediately before the occurrence to a certain time after the occurrence), or may be current values ​​(values ​​that can be estimated to be the above maximum values) measured at the time of the short circuit (for example, immediately after the short circuit is detected).

[0085] The current value may be a measurement value anywhere on the power supply line between the power supply converter 10 and the input / output panel 20, and may be, for example, the output current value of the power supply converter 10.

[0086] A large current value at a certain point means that the distance (impedance) between the short-circuit point and that point is small.

[0087] Therefore, the estimation unit 120 estimates that the larger the current value, the closer the location of the short-circuit point is to the building where the current value was measured. As with the resistance value, the location of the short-circuit point may be roughly estimated using a predetermined point or may be calculated as follows:

[0088] Here, the current measured in Building A is I A The current measured in building B is I B The current measured in building C is I C Also, let DA be the distance from building A to the short-circuit point (distance along the power feeder line), DB be the distance from building B to the short-circuit point (distance along the power feeder line), and DC be the distance from building C to the short-circuit point (distance along the power feeder line).

[0089] The estimation unit 120 calculates "1 / I A :1 / I B :1 / I C DA, DB, and DC are calculated as follows: =DA:DB:DC. Specifically, for example, a certain length L (for example, the total length of the power supply lines connecting the bases, here 7 km as an example) is determined, and 7 km is calculated as "1 / I A :1 / I B :1 / I C ". When L=7 km, DA:DB:DC=1 km:3 km:3 km. For example, the estimation unit 120 focuses on DA, which has the shortest distance, and estimates that the short circuit occurred 1 km from building A. Note that, since the current value is the largest, it may also focus on DA, i.e., building A, and estimate that the short circuit occurred 1 km from building A.

[0090] In the above example, the peak current value was used, but the amount of electricity during the period when the short circuit occurred (the period from just before the occurrence to a certain time after the occurrence) may also be used. The amount of electricity can be obtained by integrating the waveform of the acquired current value over time.

[0091] The estimation of the short circuit point location when using electrical quantities is the same as when using current values. For example, if the electrical quantity measured in building A is A The amount of electricity measured in building B is C B The amount of electricity measured in building C is C C Then, the estimation unit 120 calculates "1 / C A :1 / C B :1 / C C DA, DB, and DC can be calculated based on the relationship "=DA:DB:DC".

[0092] (Example of device hardware configuration) The estimation device 100 can be realized, for example, by causing a computer to execute a program. This computer may be a physical computer or a virtual machine on the cloud.

[0093] That is, the estimation device 100 can be realized by using hardware resources such as a CPU and memory built into a computer to execute a program corresponding to the processing performed by the estimation device 100. The program can be recorded on a computer-readable recording medium (such as a portable memory) and can be saved or distributed. The program can also be provided via a network such as the Internet or email.

[0094] Fig. 10 is a diagram showing an example of the hardware configuration of the computer. The computer in Fig. 10 includes a drive device 1000, an auxiliary storage device 1002, a memory device 1003, a CPU 1004, an interface device 1005, a display device 1006, an input device 1007, an output device 1008, and the like, all of which are interconnected by a bus BS.

[0095] A program for realizing processing on the computer is provided by a recording medium 1001 such as a CD-ROM or a memory card. When the recording medium 1001 storing the program is set in the drive device 1000, the program is installed from the recording medium 1001 to the auxiliary storage device 1002 via the drive device 1000. However, the program does not necessarily have to be installed from the recording medium 1001, but may be downloaded from another computer via a network. The auxiliary storage device 1002 stores the installed program as well as necessary files, data, etc.

[0096] The memory device 1003 reads and stores the program from the auxiliary storage device 1002 when an instruction to start the program is received. The CPU 1004 realizes functions related to the estimation device 100 in accordance with the program stored in the memory device 1003. The interface device 1005 is used as an interface for connecting to a network, various measuring devices, etc. The display device 1006 displays a GUI (Graphical User Interface) or the like according to the program. The input device 1007 is composed of a keyboard, mouse, buttons, a touch panel, etc., and is used to input various operation instructions. The output device 1008 outputs the calculation results.

[0097] (Effects of the embodiment) The technology according to this embodiment makes it possible to estimate the location of a power line fault in a DC power supply system in which multiple locations are connected by power lines. This allows workers to quickly rush to the site of the fault and carry out restoration work. (Addendum) This specification discloses at least the following estimation devices, estimation methods, and programs. (Additional note 1) 1. An estimation device for estimating a location of a fault on a power supply line in a DC power supply system in which a plurality of bases, each equipped with a power supply device, are connected by a power supply line, the estimation device comprising: Memory and at least one processor coupled to said memory; Including, The processor: an information acquisition unit that acquires information from each base when the accident occurs; an estimation unit that estimates the location of the fault in the power feeder by comparing the information between the bases; An estimation device comprising: (Additional note 2) The information is the resistance value of a fuse provided in a power supply line within the site, the value of a current flowing through the power supply line within the site, or the amount of electricity flowing through the power supply line within the site. Item 1. The estimation device according to item 1. (Additional note 3) The processor estimates a distance along the power supply line between the base station and the location of the fault based on a ratio of the reciprocal of the current value or the electrical quantity between the base stations. Item 2. The estimation device according to claim 2. (Additional note 4) The processor estimates that the greater the resistance value, the current value, or the amount of electricity at a certain base, the closer the accident occurred to that base. Item 2. The estimation device according to claim 2. (Additional note 5) The processor displays the location of the fault on the path of the power feeder. Item 1. The estimation device according to item 1, further comprising: (Additional note 6) 1. An estimation method executed by a computer used as an estimation device for estimating a location of a fault on a power supply line in a DC power supply system in which a plurality of bases, each equipped with a power supply device, are connected by a power supply line, the method comprising: an information acquisition step of acquiring information from each base when the accident occurs; an estimation step of estimating a location of the fault in the power feeder by comparing the information between bases; An estimation method comprising: (Additional note 7) A non-transitory storage medium storing a program for causing a computer to function as each unit in the estimation device according to any one of appended claims 1 to 5.

[0098] Although the present embodiment has been described above, the present invention is not limited to such a specific embodiment, and various modifications and changes are possible within the scope of the gist of the present invention described in the claims. [Explanation of symbols]

[0099] 100 Estimator 110 Information Acquisition Department 120 Estimation part 130 Output section 140 Data storage unit 1000 Drive Device 1001 Recording media 1002 Auxiliary storage 1003 Memory device 1004 CPU 1005 Interface device 1006 Display device 1007 Input Device 1008 Output Device

Claims

1. 1. An estimation device for estimating a location of a fault on a power supply line in a DC power supply system in which a plurality of bases, each equipped with a power supply device, are connected by a power supply line, the estimation device comprising: an information acquisition unit that acquires information from each base when the accident occurs; an estimation unit that estimates a location of the fault in the power feeder line by comparing the information between bases, The information is the resistance value of a fuse provided in a power supply line within the site, or the amount of electricity obtained by integrating the waveform of the current value flowing through the power supply line within the site over time. Estimation device.

2. The estimation unit estimates a distance along the power supply line between the base and the location of the fault based on a ratio of the reciprocal of the current value or the amount of electricity between the bases. The estimation device according to claim 1 .

3. The estimation unit estimates that the larger the resistance value, the current value, or the amount of electricity at a certain base, the closer the accident occurred to the base. The estimation device according to claim 1 .

4. An output unit that displays the location of the fault on the path of the power feeder. The estimation device according to claim 1 , further comprising:

5. 1. An estimation method executed by an estimation device for estimating a location of a fault on a power supply line in a DC power supply system in which a plurality of bases, each equipped with a power supply device, are connected by a power supply line, the method comprising: an information acquisition step of acquiring information from each base when the accident occurs; an estimation step of estimating a location of the fault in the power feeder line by comparing the information between bases, The information is the resistance value of a fuse provided in a power supply line within the site, or the amount of electricity obtained by integrating the waveform of the current value flowing through the power supply line within the site over time. Estimation method.

6. A program for causing a computer to function as each unit of the estimation device according to any one of claims 1 to 4.

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