Information processing device, short circuit determination method and program

Abstract

This information processing device comprises: a data acquiring unit for acquiring data representing the characteristics of a power feeding system; and a short-circuit possibility determination unit for determining, on the basis of the data, the presence or absence of the possibility that a short-circuit has occurred in the power feeding system.

Description

[Technical field]

[0001] The present invention relates to an information processing device, a short circuit determination method, and a program. [Background technology]

[0002] For short circuit protection in indoor DC power supply systems (cable lengths of several hundred meters or less), large-capacity electrolytic capacitors and fuses built into the current distribution device are used. In the event of a short circuit, an electric charge is supplied from the large-capacity capacitor to the fuse, causing the fuse to melt. In outdoor DC power supply systems with long cable lengths (several thousand meters or so), large-capacity capacitors cannot be used, so short circuit protection is provided at two stages: the DC / DC converter gate block and the fuse.

[0003] Non-Patent Document 1 discloses a method for designing a high-voltage DC power supply system that takes into account the influence of a short-circuit fault. [Prior art documents] [Non-patent literature]

[0004] [Non-Patent Document 1] "Toward the Realization of a High-Voltage DC Power Supply System," NTT Technical Journal, August 2009, [online], Internet<URL:https: / / www.ntt.co.jp / journal / 0908 / files / jn200908018.pdf> Summary of the Invention [Problem to be solved by the invention]

[0005] With conventional technology, in a DC power supply system with a long cable length, such as an outdoor DC power supply system, if only the gate block of the DC / DC converter is stopped and the fuse is not blown, it is difficult to determine whether the DC / DC converter has failed or is short-circuited, and it takes a lot of time to determine the cause.

[0006] The disclosed technology aims to assist in identifying the cause of a failure that occurs in a power supply system. [Means for solving the problem]

[0007] The disclosed technology includes a data acquisition unit that acquires data indicating characteristics of a power supply system, and a short circuit possibility determination unit that determines whether or not there is a possibility that a short circuit has occurred in the power supply system based on the data, the data acquisition unit acquires, as the data, at least one of an operation time of a gate block of a DC / DC converter included in the power supply system, a capacitance of an X capacitor of the DC / DC converter, an impedance of a power supply cable, and a melting characteristic of a fuse included in the power supply system. It is an information processing device. Effect of the Invention

[0008] It can assist in identifying the cause of a fault in the power supply system. [Brief description of the drawings]

[0009] [Figure 1] FIG. 2 is a diagram illustrating a system configuration of a power supply system to be determined. [Diagram 2] FIG. 2 is a functional configuration diagram of an information processing device. [Diagram 3] 10 is a flowchart showing an example of the flow of a short circuit determination process. [Figure 4] FIG. 1 is a diagram showing an outline of an equivalent circuit. [Diagram 5] FIG. 2 is a first diagram showing an example of a current waveform. [Figure 6] FIG. 13 is a second diagram showing an example of a current waveform. [Figure 7] FIG. 2 illustrates an example of a hardware configuration of a computer. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] 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.

[0011] FIG. 1 is a diagram showing a system configuration of a power supply system to be determined.

[0012] The power supply system 1 to be subjected to the determination process according to the present embodiment is an outdoor DC power supply system, and is a system in which the length of the power supply cable is several thousand meters. The power supply system 1 includes a rectifier (or AC / DC converter) 901, a distribution board 902, a DC / DC converter 903, a fuse 906, a cable impedance 907, and a device 908.

[0013] The DC / DC converter 903 also includes a gate block 904 and an X capacitor 905 .

[0014] In an outdoor DC power supply system, unlike an indoor DC power supply system, a large-capacity capacitor cannot be used, so the fuse 906 is less likely to blow. Furthermore, as the length of the power supply cable increases, the cable impedance increases and the short-circuit current decreases, so the fuse 906 is less likely to blow.

[0015] DC / DC converter 903 also has a function of detecting the flow of an overcurrent due to a short circuit or the like, and opening gate block 904 to stop the power supply. However, even after gate block 904 is opened, the charge stored in X capacitor 905 (approximately several hundred to several thousand uF / kW) built into the output filter of DC / DC converter 903 continues to flow toward the short-circuit point. As a result, even if gate block 904 operates quickly, fuse 906 may be blown by the current flowing from X capacitor 905.

[0016] Below, we will explain a method for determining whether or not there is a possibility that a short circuit has occurred, using the information processing device of this embodiment, in such a situation where the gate block 904 is stopped and the fuse 906 is not blown.

[0017] FIG. 2 is a functional configuration diagram of the information processing device.

[0018] The information processing device 10 includes a data acquisition unit 11 , a current waveform calculation unit 12 , a judgment reference value calculation unit 13 , a short circuit possibility judgment unit 14 , and an output unit 15 .

[0019] The data acquiring unit 11 acquires data indicating characteristics of the power supply system 1. Specifically, the data acquiring unit 11 acquires data indicating an operation time of a gate block 904 of a DC / DC converter 903 included in the power supply system 1, a capacitance of an X capacitor 905 of the DC / DC converter 903, an impedance of a power supply cable, and a melting characteristic of a fuse 906 included in the power supply system 1. The data acquiring unit 11 may acquire data by an input operation of a user, or may receive data from another device or the like.

[0020] The current waveform calculation unit 12 calculates a current waveform when the power supply system 1 is short-circuited, based on the operation time of the gate block 904, the capacitance of the X capacitor 905, and the impedance of the power supply cable, among the data acquired by the data acquisition unit 11.

[0021] Specifically, when the operation time of the gate block 904 is equal to or less than a predetermined threshold, the current waveform calculation unit 12 calculates a current waveform when the power supply system 1 is short-circuited based on the capacitance of the X capacitor 905 and the impedance of the power supply cable, and when the operation time of the gate block 904 exceeds the threshold, the current waveform calculation unit 12 calculates a current waveform when the power supply system 1 is short-circuited based on the capacitance of the X capacitor 905, the impedance of the power supply cable, and the operation time of the gate block 904.

[0022] The current waveform calculation unit 12 calculates the current waveform when the power supply system 1 is short-circuited by simulating a circuit equivalent to the power supply system 1.

[0023] The judgment reference value calculation unit 13 calculates a value (judgment reference value) that is a criterion for judging the possibility of a short circuit, based on the current waveform calculated by the current waveform calculation unit 12. Specifically, the judgment reference value calculation unit 13 calculates the total charge (It) flowing in the circuit when a short circuit occurs and the Joule integral value (I2 t) is calculated.

[0024] The short circuit possibility determination unit 14 determines whether or not there is a possibility that a short circuit has occurred based on the calculated determination reference value and the melting characteristics of the fuse 906. Specifically, the short circuit possibility determination unit 14 determines whether or not there is a possibility that a short circuit has occurred based on the calculated determination reference value and the melting characteristics of the fuse 906. 2 Depending on whether or not t) exceeds the limit value of the Joule integral obtained from the melting characteristics of the fuse 906, it is determined whether or not there is a possibility that a short circuit has occurred.

[0025] The output unit 15 outputs the determination result of the short circuit possibility determination unit 14. The output unit 15 may transmit information indicating the determination result to another device, or may display a screen indicating the determination result.

[0026] (Operation of information processing device 10) Next, a description will be given of the operation of the information processing device 10. Fig. 3 is a flowchart showing an example of the flow of a short circuit determination process.

[0027] When a failure occurs in the power supply system 1, a short circuit determination process is started in response to an operation by a user such as an administrator of the power supply system 1.

[0028] The data acquiring unit 11 acquires data indicating characteristics of the power supply system 1, which is an outdoor DC power supply system (step S101). The data indicating the characteristics of the power supply system 1 includes an operation time of a gate block 904 of a DC / DC converter 903 included in the power supply system 1, a capacitance of an X capacitor 905 of the DC / DC converter 903, an impedance of a power supply cable, and a melting characteristic of a fuse 906 included in the power supply system 1.

[0029] Next, the current waveform calculation section 12 judges whether or not the operation time of the gate block 904 is 100 μs or less (step S102). Note that 100 μs is a value that is set in advance as a predetermined threshold value.

[0030] When the current waveform calculation unit 12 determines that the operation time of the gate block 904 is 100 μs or less (step S102: Yes), it calculates the current waveform (time constant) at the time of short circuit by simulation based on the capacitor capacitance and cable impedance (step S103). This simulation is a simulation using an equivalent circuit described later.

[0031] Next, the judgment reference value calculation unit 13 calculates the total charge (It) flowing in the circuit when a short circuit occurs and the Joule integral value (I 2 t) (step S104). Then, short circuit possibility determination unit 14 determines whether the calculated total charge amount is smaller than the limit value of the total charge amount obtained from the melting characteristics of fuse 906, or whether the calculated Joule integral value is smaller than the limit value of the Joule integral value obtained from the melting characteristics of fuse 906 (step S105).

[0032] If the short circuit possibility determination unit 14 determines that the calculated total charge amount is smaller than the limit value of the total charge amount obtained from the melting characteristics of the fuse 906, or the calculated Joule integral value is smaller than the limit value of the Joule integral value obtained from the melting characteristics of the fuse 906 (step S105: Yes), it determines that there is a possibility of a short circuit (step S106).

[0033] Furthermore, if the short circuit possibility determination unit 14 determines that the calculated total charge amount is not smaller than the limit value of the total charge amount obtained from the melting characteristics of the fuse 906 and that the calculated Joule integral value is not smaller than the limit value of the Joule integral value obtained from the melting characteristics of the fuse 906 (step S105: No), it determines that there is no possibility of a short circuit (step S107).

[0034] Furthermore, in the processing of step S102, if the current waveform calculation unit 12 determines that the operation time of the gate block 904 is not 100 μs or less (step S102: No), it calculates the current waveform (time constant) during a short circuit by simulation based on the capacitor capacitance, cable impedance, and operation time of the gate block (step S108).

[0035] Next, the judgment reference value calculation unit 13 calculates the total charge (It) flowing in the circuit when a short circuit occurs and the Joule integral value (I 2 t) (step S109). Then, short circuit possibility determination unit 14 determines whether or not the calculated total charge amount exceeds the limit value of the total charge amount obtained from the melting characteristics of the fuse, and whether or not the calculated Joule integral value exceeds the limit value of the Joule integral value obtained from the melting characteristics of the fuse (step S110).

[0036] If the short circuit possibility determination unit 14 determines that the calculated total charge amount exceeds the limit value of the total charge amount obtained from the melting characteristics of the fuse and that the calculated Joule integral value exceeds the limit value of the Joule integral value obtained from the melting characteristics of the fuse (step S110: Yes), it determines that there is no possibility of a short circuit (step S107).

[0037] Furthermore, if the short circuit possibility determination unit 14 determines that the calculated total charge amount does not exceed the limit value of the total charge amount obtained from the melting characteristics of the fuse, or that the calculated Joule integral value does not exceed the limit value of the Joule integral value obtained from the melting characteristics of the fuse (step S110: No), it determines that there is an error and displays the error on a screen or the like (step S111).Then, the process returns to step S101, and the data acquisition unit 11 acquires the corrected data.

[0038] 4 is a diagram showing an outline of an equivalent circuit 800. The equivalent circuit 800 is used in steps S103 and S108 shown in FIG.

[0039] The equivalent circuit 800 includes a DC / DC converter 803, a fuse 804, an RL series circuit 805, and a short-circuit switch 806. The DC / DC converter 803 includes a gate block 801 and an X capacitor 802.

[0040] In step S103, since the operation time of the gate block is short, the current waveform calculation unit 12 does not take the operation time of the gate block into consideration and calculates the total charge amounts It and I 2 Calculate t.

[0041] In addition, in step S108, since the operation time of the gate block is long, the current waveform calculation unit 12 assumes that the charge from the X capacitor 802 and the charge from the gate block 801 flow to the fuse 804, and calculates the total charge amounts It and I 2 Calculate t.

[0042] FIG. 5 is a first diagram showing an example of a current waveform.

[0043] Graph 701 is an example of a current waveform calculated in step S103. Shown is a current waveform 702 indicating the current flowing through fuse 804, and a current waveform 703 indicating the current flowing through gate block 801. In this case, since there is almost no current flowing through gate block 801, current waveform 702 matches the current waveform indicating the current flowing through X capacitor 802.

[0044] FIG. 6 is a second diagram showing an example of a current waveform.

[0045] Graph 711 is an example of a current waveform calculated in step S108. Shown are a current waveform 712 indicating a current flowing through fuse 804, and a current waveform 713 indicating a current flowing through gate block 801. In this case, a current waveform indicating a current obtained by adding together a current flowing through X capacitor 802 and a current flowing through gate block 801 becomes a current waveform indicating a current flowing through fuse 804.

[0046] According to the information processing device 10 of this embodiment, in an outdoor DC power supply system with a long cable length, when only the gate block of the DC / DC converter is stopped and the fuse is not blown, the presence or absence of the possibility of a short circuit is determined. This makes it possible to assist in identifying the cause of whether the DC / DC converter is broken or has a short circuit.

[0047] (Example of hardware configuration of information processing device 10) The information processing device 10 can be realized, for example, by making a computer execute a program in which the processing contents described in this embodiment are described. Note that this "computer" may be a physical machine or a virtual machine on the cloud. When a virtual machine is used, the "hardware" described here is virtual hardware.

[0048] The above program can be recorded on a computer-readable recording medium (such as a portable memory) and can be stored or distributed. The above program can also be provided via a network such as the Internet or e-mail.

[0049] Fig. 7 is a diagram showing an example of the hardware configuration of the computer. The computer in Fig. 7 has 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, etc., which are all connected to each other via a bus B.

[0050] The program for realizing the 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.

[0051] The memory device 1003 reads out and stores the program from the auxiliary storage device 1002 when an instruction to start the program is received. The CPU 1004 realizes the functions related to the device 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. The display device 1006 displays a GUI (Graphical User Interface) or the like according to a program. The input device 1007 is composed of a keyboard and mouse, buttons, a touch panel, or the like, and is used to input various operation instructions. The output device 1008 outputs the results of calculations.

[0052] (Summary of the embodiment) This specification describes at least the information processing device, the short circuit determination method, and the program described in the following sections. (Section 1) A data acquisition unit that acquires data indicating characteristics of the power supply system; and a short circuit possibility determination unit that determines whether or not there is a possibility that a short circuit has occurred in the power supply system based on the data. Information processing device. (Section 2) the data acquisition unit acquires the data indicating an operation time of a gate block of a DC / DC converter included in the power supply system, a capacitance of an X capacitor of the DC / DC converter, an impedance of a power supply cable, and a melting characteristic of a fuse included in the power supply system. 2. The information processing device according to claim 1. (Section 3) a current waveform calculation unit that calculates a current waveform when a short circuit occurs in the power supply system based on an operation time of the gate block, a capacitance of the X capacitor, and an impedance of the power supply cable; Based on the calculated current waveform, the amount of charge (It) or Joule integral (I 2 t), the short circuit possibility determination unit determines whether or not there is a possibility that the short circuit has occurred based on the calculated charge amount or the Joule integral value and melting characteristics of the fuse. 3. An information processing device according to claim 2. (Section 4) the current waveform calculation unit calculates a current waveform when the power supply system is short-circuited based on the capacitance of the X capacitor and the impedance of the power supply cable when the operation time of the gate block is equal to or less than a predetermined threshold, and calculates the current waveform when the power supply system is short-circuited based on the capacitance of the X capacitor, the impedance of the power supply cable, and the operation time of the gate block when the operation time of the gate block exceeds the threshold. 4. The information processing device according to claim 3. (Section 5) the judgment reference value calculation unit calculates the amount of charge and the Joule integral value, The short circuit possibility determination unit is When the operation time of the gate block is equal to or less than the threshold value, determine that there is a possibility of a short circuit when the calculated amount of charge is smaller than a limit value of the amount of charge obtained from the melting characteristics of the fuse, or when the calculated Joule integral value is smaller than a limit value of the Joule integral value obtained from the melting characteristics of the fuse, and determine that there is no possibility of a short circuit when the calculated amount of charge is not smaller than the limit value of the amount of charge obtained from the melting characteristics of the fuse and when the calculated Joule integral value is not smaller than the limit value of the Joule integral value obtained from the melting characteristics of the fuse, When the operation time of the gate block exceeds the threshold value, if the calculated amount of charge exceeds the limit value of the amount of charge obtained from the melting characteristics of the fuse and if the calculated Joule integral value exceeds the limit value of the Joule integral value obtained from the melting characteristics of the fuse, it is determined that there is no possibility of a short circuit, and if the calculated amount of charge does not exceed the limit value of the amount of charge obtained from the melting characteristics of the fuse or if the calculated Joule integral value does not exceed the limit value of the Joule integral value obtained from the melting characteristics of the fuse, it is determined that an error has occurred. 5. An information processing device according to claim 4. (Section 6) the current waveform calculation unit calculates the current waveform when the power supply system is short-circuited by a simulation in a circuit equivalent to the power supply system. 6. An information processing device according to any one of claims 3 to 5. (Section 7) 1. A computer-implemented method comprising: obtaining data indicative of a characteristic of a power supply system; and determining whether or not there is a possibility that a short circuit has occurred in the power supply system based on the data. Method for determining short circuit. (Section 8) A program for causing a computer to function as each unit in the information processing device according to any one of claims 1 to 6.

[0053] Although the present embodiment has been described above, the present invention is not limited to such a specific embodiment, and various modifications and variations are possible within the scope of the gist of the present invention described in the claims. [Explanation of symbols]

[0054] 1. Power Supply System 10. Information processing device 11 Data Acquisition Section 12 Current waveform calculation section 13. Judgment criteria value calculation section 14 Short circuit possibility determination section 15 Output section 801 Gate Block 802X Capacitor 803 DC / DC Converter 804 Fuse 805 RL series circuit 806 Shorting Switch 901 Rectifier (or AC / DC converter) 902 Distribution Board 903 DC / DC Converter 904 Gate Block 905X Capacitor 906 Fuse 907 Cable Impedance 908 Equipment 1000 Drive Device 1001 Recording media 1002 Auxiliary storage device 1003 Memory device 1004 CPU 1005 Interface device 1006 Display device 1007 Input Device 1008 Output device

Claims

1. A data acquisition unit that acquires data indicating characteristics of the power supply system; a short circuit possibility determination unit that determines whether or not there is a possibility that a short circuit has occurred in the power supply system based on the data, the data acquisition unit acquires, as the data, at least one of an operation time of a gate block of a DC / DC converter included in the power supply system, a capacitance of an X capacitor of the DC / DC converter, an impedance of a power supply cable, and a melting characteristic of a fuse included in the power supply system; Information processing device.

2. A data acquisition unit that acquires data indicating characteristics of a power supply system; a short circuit possibility determination unit that determines whether or not there is a possibility that a short circuit has occurred in the power supply system based on the data, the data acquisition unit acquires the data indicating an operation time of a gate block of a DC / DC converter included in the power supply system, a capacitance of an X capacitor of the DC / DC converter, an impedance of a power supply cable, and a melting characteristic of a fuse included in the power supply system. Information processing device.

3. a current waveform calculation unit that calculates a current waveform when a short circuit occurs in the power supply system based on an operation time of the gate block, a capacitance of the X capacitor, and an impedance of the power supply cable; Based on the calculated current waveform, the amount of charge (It) or the Joule integral value (I ２ t), the short circuit possibility determination unit determines whether or not there is a possibility that the short circuit has occurred based on the calculated charge amount or the Joule integral value and melting characteristics of the fuse. The information processing device according to claim 2 .

4. the current waveform calculation unit calculates a current waveform when the power supply system is short-circuited based on a capacitance of the X capacitor and an impedance of the power supply cable when the operation time of the gate block is equal to or less than a predetermined threshold, and calculates the current waveform when the power supply system is short-circuited based on the capacitance of the X capacitor, the impedance of the power supply cable, and the operation time of the gate block when the operation time of the gate block exceeds the threshold. The information processing device according to claim 3 .

5. the judgment reference value calculation unit calculates the amount of charge and the Joule integral value, The short circuit possibility determination unit is When the operation time of the gate block is equal to or less than the threshold value, determine that there is a possibility of a short circuit when the calculated amount of charge is smaller than a limit value of the amount of charge obtained from the melting characteristics of the fuse, or when the calculated Joule integral value is smaller than a limit value of the Joule integral value obtained from the melting characteristics of the fuse, and determine that there is no possibility of a short circuit when the calculated amount of charge is not smaller than the limit value of the amount of charge obtained from the melting characteristics of the fuse and when the calculated Joule integral value is not smaller than the limit value of the Joule integral value obtained from the melting characteristics of the fuse, When the operation time of the gate block exceeds the threshold value, if the calculated amount of charge exceeds the limit value of the amount of charge obtained from the melting characteristics of the fuse and if the calculated Joule integral value exceeds the limit value of the Joule integral value obtained from the melting characteristics of the fuse, it is determined that there is no possibility of a short circuit, and if the calculated amount of charge does not exceed the limit value of the amount of charge obtained from the melting characteristics of the fuse or if the calculated Joule integral value does not exceed the limit value of the Joule integral value obtained from the melting characteristics of the fuse, it is determined that an error has occurred. The information processing device according to claim 4.

6. the current waveform calculation unit calculates the current waveform when the power supply system is short-circuited by a simulation in a circuit equivalent to the power supply system. The information processing device according to claim 3 .

7. 1. A computer-implemented method comprising: A data acquisition step of acquiring data indicative of characteristics of the power supply system; and a short circuit possibility determination step of determining whether or not there is a possibility that a short circuit has occurred in the power supply system based on the data, In the data acquisition step, the computer acquires, as the data, at least one of an operation time of a gate block of a DC / DC converter included in the power supply system, a capacitance of an X capacitor of the DC / DC converter, an impedance of a power supply cable, and a melting characteristic of a fuse included in the power supply system. Method for determining short circuit.

8. A program for causing a computer to function as each unit in the information processing device according to any one of claims 1 to 6.

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