Information processing device, fuse selection method and program

Abstract

This information processing device comprises: a data acquisition unit that acquires data indicating the characteristics of a power-feed system; and a fuse selecting unit that selects, on the basis of the data, a fuse that will melt if a short occurs in the power-feed system.

Description

[Technical Field]

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

[0002] For short circuit protection in indoor DC power supply systems (cable lengths of a few 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 it to blow. In outdoor DC power supply systems with long cable lengths (around a few thousand meters), large-capacity capacitors cannot be used, so short circuit protection is provided at two stages: the DC / DC converter gate block and fuses.

[0003] Non-Patent Document 1 discloses a system design method that takes into consideration the influence of short-circuit faults in a high-voltage DC power supply system. [Prior art documents] [Non-patent literature]

[0004] [Non-Patent Document 1] "Toward the Realization of High-Voltage DC Power Supply Systems," 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] In conventional DC power supply systems with long cable lengths, such as outdoor DC power supply systems, there is a problem in that there are no design guidelines for fuse selection, making it difficult to design short-circuit protection.

[0006] The disclosed technology aims to support the selection of fuses in a power supply system. [Means for solving the problem]

[0007] The disclosed technology is an information processing device that has a function of selecting a fuse to blow when a short circuit occurs in the system based on data, and the data is at least one of an operating time of a gate block of a DC / DC converter provided in the system, a capacitance of an X capacitor of the DC / DC converter, and an impedance of a power supply cable. [Effects of the Invention]

[0008] It can assist in selecting fuses in power supply systems. [Brief explanation of the drawings]

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

[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 the 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 this 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] Outdoor DC power supply systems cannot use large-capacity capacitors like indoor DC power supply systems, so they are less likely to blow fuse 906. Furthermore, as the length of the power supply cable increases, the cable impedance increases and the short-circuit current decreases, making fuse 906 less likely to blow.

[0015] DC / DC converter 903 also has a function to detect the flow of overcurrent due to a short circuit or the like, and open gate block 904 to stop the power supply. However, even after gate block 904 is opened, the charge stored in X capacitor 905 (on the order of several hundred to several thousand uF / kW) incorporated in 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, the current flowing from X capacitor 905 may blow fuse 906.

[0016] Hereinafter, a method for selecting a fuse 906 having an appropriate rated current for short-circuit protection of the power supply system 1 using the information processing device according to this embodiment will be described.

[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 selection reference value calculation unit 13, a fuse selection unit 14, and an output unit 15.

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

[0020] The current waveform calculation unit 12 calculates the 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, which are 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 the 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 the 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 selection reference value calculation unit 13 calculates a value (selection reference value) that serves as a reference for selecting the fuse 906 based on the current waveform calculated by the current waveform calculation unit 12. Specifically, the selection reference value calculation unit 13 calculates the total charge (It) and Joule integral (I2 t) is calculated.

[0024] The fuse selection unit 14 selects the fuse 906 that will blow out when a short circuit occurs, based on the calculated selection reference value. Specifically, the fuse selection unit 14 selects the fuse 906 that will blow out when a short circuit occurs, based on the calculated total charge (It) exceeding the limit value of the total charge obtained from the melting characteristics of the fuse 906, or the Joule integral value (I 2 t) exceeds the limit value of the Joule integral value obtained from the melting characteristics of the fuse 906. For example, the fuse selection unit 14 selects fuses based on information indicating the melting characteristics of a plurality of fuses (melting characteristic information).

[0025] The fusing characteristics are, for example, the characteristics based on the charge amount (It) (IT characteristics) and the Joule integral value (I 2 t)-based characteristics (I 2 The fuse selection unit 14 calculates the limit value of the total charge amount based on the IT characteristic, and sets the limit value of the Joule integral value as I 2 The calculation is based on the tT characteristic. However, the fusing characteristics are not limited to these, and other characteristics may also be used.

[0026] The output unit 15 outputs the selection result of the fuse selection unit 14. The output unit 15 may transmit information indicating the selection result to another device, or may display a screen indicating the selection result.

[0027] (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.

[0028] When a failure occurs in the power supply system 1, the short circuit determination process is started in response to an operation by a user such as an administrator of the power supply system 1.

[0029] 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 operating 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.

[0030] Next, the current waveform calculation unit 12 determines whether the operation time of the gate block 904 is 100 μs or less (step S102). Note that 100 μs is a value set in advance as a predetermined threshold value.

[0031] 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, which will be described later.

[0032] Next, the selection reference value calculation unit 13 calculates the total charge (It) flowing through the fuse when a short circuit occurs and the Joule integral (I 2 t) (step S104). Then, the fuse selection unit 14 selects a fuse that can be blown in the event of a short circuit, based on the melting characteristic information of the plurality of fuses (step S105).

[0033] Also, 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 S106).

[0034] Next, the selection reference value calculation unit 13 calculates the total charge (It) flowing in the circuit when a short circuit occurs and the Joule integral (I 2t) is calculated (step S107). Then, the fuse selection unit 14 selects a fuse that can be blown in the event of a short circuit, based on the melting characteristic information of the plurality of fuses (step S105).

[0035] 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.

[0036] 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.

[0037] In step S103, since the operation time of the gate block is short, the current waveform calculation unit 12 calculates the total charge amounts It and I flowing through the fuse 804 without taking the operation time of the gate block into consideration. 2 Calculate t.

[0038] 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 flowing to the fuse 804 according to the operation time of the gate block. 2 Calculate t.

[0039] FIG. 5 is a first diagram showing an example of a current waveform.

[0040] Graph 701 is an example of a current waveform calculated in step S103. Graph 701 shows 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.

[0041] FIG. 6 is a second diagram showing an example of a current waveform.

[0042] Graph 711 is an example of a current waveform calculated in step S108. Graph 711 shows a current waveform 712 indicating the current flowing through fuse 804, and a current waveform 713 indicating the current flowing through gate block 801. In this case, the current waveform indicating the sum of the current flowing through X capacitor 802 and the current flowing through gate block 801 is the current waveform indicating the current flowing through fuse 804.

[0043] According to the information processing device 10 of this embodiment, in an outdoor DC power supply system with a long cable length, a fuse that will blow in the event of a short circuit is selected, thereby making it possible to assist in the selection of fuses in the power supply system.

[0044] (Example of hardware configuration of information processing device 10) The information processing device 10 can be realized, for example, by causing a computer to execute a program that describes the processing content described in this embodiment. 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.

[0045] The above program can be recorded on a computer-readable recording medium (such as a portable memory) and stored or distributed. The above program can also be provided via a network such as the Internet or email.

[0046] Fig. 7 is a diagram showing an example of the hardware configuration of the computer. The computer in Fig. 7 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 via a bus B.

[0047] 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.

[0048] The memory device 1003 reads and stores a 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 the program. The input device 1007 is composed of a keyboard, 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.

[0049] (Summary of the embodiment) This specification describes at least the information processing device, fuse selection method, and program described in the following sections. (Section 1) a data acquisition unit that acquires data indicating characteristics of the power supply system; a fuse selection unit that selects a fuse to be blown when a short circuit occurs 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 value (I 2 a selection criterion value calculation unit that calculates a selection criterion value t), the fuse selection unit selects a fuse to be blown when the short circuit occurs, based on the calculated charge amount or the Joule integral value and the blowing characteristics of the fuse. 3. The 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 fuse selection unit selects a fuse to be blown when the short circuit occurs, based on information indicating the blowing characteristics of a plurality of fuses; 5. The 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 simulating a circuit equivalent to the power supply system. 6. The information processing device according to any one of items 3 to 5. (Section 7) 1. A computer-implemented method comprising: obtaining data characteristic of the power supply system; and selecting a fuse to be blown when a short circuit occurs in the power supply system based on the data. Fuse selection method. (Section 8) A program for causing a computer to function as each unit in the information processing device according to any one of items 1 to 6.

[0050] 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]

[0051] 1 Power supply system 10. Information processing equipment 11 Data Acquisition Section 12 Current waveform calculation section 13 Selection criteria value calculation unit 14 Fuse selection section 15 Output section 801 Gate Block 802 x Capacitors 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 905 x Capacitors 906 Fuse 907 Cable Impedance 908 Equipment 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. It has the ability to select the fuse that will blow if a short circuit occurs in the system based on the data. The data is at least one of an operating time of a gate block of a DC / DC converter included in the system, a capacitance of an X capacitor of the DC / DC converter, and an impedance of a power supply cable. Information processing device.

2. It has the ability to select the fuse that will blow if a short circuit occurs in the system based on the data. The data includes an operating time of a gate block of a DC / DC converter included in the 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 system. Information processing device.

3. the system is a power supply system; 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 a selection criterion value calculation unit that calculates a selection criterion value t), the function is to select a fuse to be blown when the short circuit occurs, based on the calculated charge amount or the Joule integral value and the 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 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. The information processing device according to claim 3 .

5. The function is to select a fuse to be blown when the short circuit occurs based on information indicating the blowing characteristics of a plurality of fuses. 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 simulating a circuit equivalent to the power supply system. The information processing device according to claim 3 .

7. 1. A computer-implemented method comprising: selecting a fuse to blow in the event of a short circuit in the system based on the data; The data is at least one of an operating time of a gate block of a DC / DC converter included in the system, a capacitance of an X capacitor of the DC / DC converter, and an impedance of a power supply cable. Fuse selection method.

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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