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WO2025187078A1 - Système de protection, dispositif de commande, procédé de commande et programme - Google Patents

Système de protection, dispositif de commande, procédé de commande et programme

Info

Publication number
WO2025187078A1
WO2025187078A1 PCT/JP2024/009182 JP2024009182W WO2025187078A1 WO 2025187078 A1 WO2025187078 A1 WO 2025187078A1 JP 2024009182 W JP2024009182 W JP 2024009182W WO 2025187078 A1 WO2025187078 A1 WO 2025187078A1
Authority
WO
WIPO (PCT)
Prior art keywords
current
current sensor
measurement value
power line
protection system
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
PCT/JP2024/009182
Other languages
English (en)
Japanese (ja)
Other versions
WO2025187078A8 (fr
Inventor
裕二 樋口
直樹 花岡
徹 田中
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NTT Inc
NTT Inc USA
Original Assignee
Nippon Telegraph and Telephone Corp
NTT Inc USA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nippon Telegraph and Telephone Corp, NTT Inc USA filed Critical Nippon Telegraph and Telephone Corp
Priority to PCT/JP2024/009182 priority Critical patent/WO2025187078A1/fr
Publication of WO2025187078A1 publication Critical patent/WO2025187078A1/fr
Publication of WO2025187078A8 publication Critical patent/WO2025187078A8/fr
Pending legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/02—Details
    • H02H3/05—Details with means for increasing reliability, e.g. redundancy arrangements
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current

Definitions

  • the present invention relates to a power line protection system.
  • Non-Patent Document 1 In DC buses through which DC current flows, short-circuit currents and overload currents may occur, and protective actions have traditionally been taken to protect against these (for example, see Non-Patent Document 1).
  • the present invention was made in consideration of the above points, and aims to provide technology for performing appropriate protective action in the event of an event occurring in a power supply system.
  • a DC current sensor provided on a power line; an AC current sensor provided on the power line; a circuit breaker provided on the power line; a determination unit that determines that a specific event has occurred based on the measurement value of the DC current sensor and the measurement value of the AC current sensor; and a control unit that executes a protective action corresponding to the specific event.
  • the disclosed technology makes it possible to take appropriate protective action in response to events that occur in the power supply system.
  • FIG. 1 is a diagram for explaining a problem with the conventional technology. 1 is a diagram for explaining an outline of an embodiment of the present invention; 1 is a diagram illustrating a configuration example of a DC bus protection system according to an embodiment of the present invention. FIG. 1 illustrates an example of the operation of the DC bus protection system 100.
  • FIG. 10 is a diagram for explaining variations.
  • FIG. 1 is a diagram showing a flow path in the first embodiment.
  • FIG. 10 is a diagram illustrating an example of thresholds and measurement values in the first embodiment.
  • FIG. 10 is a diagram showing a flow path in Example 2.
  • FIG. 10 is a diagram illustrating an example of thresholds and measurement values in the second embodiment.
  • FIG. 3 is a diagram illustrating the configuration of a control device 300.
  • FIG. 2 is a diagram illustrating an example of the hardware configuration of a control device 300.
  • a protection system on a DC bus will be described as an example of a protection system using the technology of the present invention, but the technology of the present invention is not limited to DC buses and can be applied to power supply systems in general.
  • the technology of the present invention may also be applied to branch lines in loop-type wiring.
  • the protective action against a short circuit current and an overload current is to open a circuit breaker or to stop the output of a power conversion device.
  • opening a circuit breaker is referred to as protective action (1)
  • stopping the output of a power conversion device is referred to as protective action (2).
  • a DC current sensor 110 and an AC current sensor 120 are provided on a branch line of the DC bus.
  • the AC current sensor 120 is, for example, a current transformer.
  • Figure 2 also shows the actual DC current waveform, the waveform detected by the DC current sensor 110, and the waveform detected by the AC current sensor 120 for each of the short-circuit current and the overload current.
  • overcurrent excluding short-circuit current
  • the DC current sensor 110 detects waveforms similar to the actual DC current waveform.
  • the AC current sensor 120 detects the amount of change in current (differential value). Therefore, when the current changes suddenly, such as in a short-circuit current, the sensor output value becomes large. On the other hand, when the current changes slowly, such as in an overload current, the sensor output value becomes small.
  • the DC current sensor 110 and the AC current sensor 120 output different values for short-circuit current and overload current. Therefore, by comparing the output value from the DC current sensor 110 and the output value from the AC current sensor 120 with their respective threshold values, it is possible to determine whether the current is a short-circuit current or an overload current.
  • the determination method using the output values from the DC current sensor 110 and the AC current sensor 120 can be applied to detecting events other than short-circuit currents and overload currents.
  • FIG. 3 shows an example of a DC bus system configuration according to this embodiment.
  • a power conversion device 200 is connected to each branch line connected to a trunk line via a DC bus protection system 100.
  • the DC bus protection system may also be referred to as a protection system.
  • the following describes the DC bus protection system 100 on the left side of FIG. 3, but the configuration and operation of the other DC bus protection systems 100 are similar to those of the DC bus protection system 100 on the left side.
  • the DC bus protection system 100 includes a DC current sensor 110, an AC current sensor 120, a determination unit 130, a control unit 140, and a circuit breaker 150.
  • the DC current sensor 110, the AC current sensor 120, and the circuit breaker 150 are provided on the branch line (on the power line).
  • the determination unit 130 is connected to each of the DC current sensor 110 and the AC current sensor 120 via signal lines.
  • the control unit 140 is connected to each of the determination unit 130, the circuit breaker 150, and the power conversion device 200 via signal lines.
  • the determination unit 130 determines whether a short-circuit current or an overload current has occurred based on the measurement values of the DC current sensor 110 and the AC current sensor 120.
  • the control unit 140 opens the circuit breaker 150. If the determination unit 130 determines that an overload current has occurred, the control unit 140 commands the power conversion device 200 to reduce the current.
  • the power conversion device to be instructed to reduce the current does not have to be the power conversion device 200 connected to the left DC bus protection system 100 in Figure 3.
  • a command to reduce the current may be sent to a power conversion device that supplies power to the power conversion device 200 connected to the left DC bus protection system 100 in Figure 3.
  • each threshold value is set in the determination unit 130 in advance.
  • step 1 the DC current sensor 110 and the AC current sensor 120 each measure a current value, and the determination unit 130 acquires each measurement value.
  • the determination unit 130 determines whether the measurement value (magnitude of current) of the DC current sensor 110 is greater than the threshold value of the DC current sensor 110. If the determination result in S2 is Yes, proceed to S3; if the determination result is No, return to S1.
  • the determination unit 130 determines whether the measurement value of the AC current sensor 120 is greater than the threshold value of the AC current sensor 120. If the determination result in S3 is Yes, proceed to S11; if the determination result is No, proceed to S21.
  • the determination unit 130 determines that a short-circuit current has occurred.
  • the control unit 140 sends a signal to the circuit breaker 150 to open the circuit breaker 150. As a result, the circuit breaker 150 is opened in S13.
  • the determination unit 130 determines that an overload current has occurred.
  • the control unit 140 sends a command to the power conversion device 200 to reduce the current (a command to reduce the magnitude of the current). This causes the power conversion device 200 to perform an operation to reduce the current.
  • Two thresholds may be set in the determination unit 130 for the measurement value of the DC current sensor 110.
  • the operation of the determination unit 130 in S2 is as follows: A to C. The larger of the two thresholds is set as the sensor threshold (large), and the smaller is set as the sensor threshold (small).
  • Figure 5 shows an image of the current value, the sensor threshold (large), and the sensor threshold (small). Note that setting two thresholds is just one example, and three or more thresholds may be set.
  • Example 1 the flow when a short circuit current occurs will be described as Example 1, and the flow when an overload current occurs will be described as Example 2.
  • Example 1 Fig. 6 shows the flow path in Example 1. That is, in Example 1, processing is performed along the line shown in Fig. 6. Also, the graph of "short circuit current" shown in the upper part of Fig. 7 corresponds to the graph of Example 1.
  • the processing in Example 1 is as follows.
  • the DC current sensor 110 and the AC current sensor 120 each measure a current value, and the determination unit 130 acquires each measurement value.
  • the determination unit 130 determines that the measurement value of the DC current sensor 110 is greater than the threshold value of the DC current sensor 110 ( Figure 7(b)). In S3, the determination unit 130 determines that the measurement value of the AC current sensor 120 is greater than the threshold value of the AC current sensor 120 ( Figure 7(c)).
  • the determination unit 130 determines that a short-circuit current has occurred.
  • the control unit 140 sends a signal to the circuit breaker 150 to open the circuit breaker 150, and in S13, the circuit breaker 150 is opened.
  • Example 2 Fig. 8 shows the flow path in Example 2. That is, in Example 2, processing is performed along the line shown in Fig. 8. Also, the graph of "overcurrent (overload current)" shown in the lower part of Fig. 9 corresponds to the graph of Example 2.
  • the processing in Example 2 is as follows.
  • the DC current sensor 110 and the AC current sensor 120 each measure a current value, and the determination unit 130 acquires each measurement value.
  • the determination unit 130 determines that the measurement value of the DC current sensor 110 is greater than the threshold value of the DC current sensor 110 ( Figure 9(b)). In S3, the determination unit 130 determines that the measurement value of the AC current sensor 120 is less than or equal to the threshold value of the AC current sensor 120 ( Figure 9(c)).
  • the determination unit 130 determines that an overload current has occurred.
  • the control unit 140 sends a command to the power conversion device 200 to reduce the current.
  • the power conversion device 200 performs an operation to reduce the current.
  • the configuration including the determination unit 130 and the control unit 140 may be referred to as a control device 300.
  • the control device 300 may be provided within the DC bus protection system 100 as shown in FIG. 3 or may be provided outside the DC bus protection system 100.
  • Figure 10 shows a configuration diagram of the control device 300.
  • the control device 300 includes a determination unit 130 and a control unit 140.
  • the determination unit 130 determines that a specific event has occurred based on the measurement values of the DC current sensor 110 and the AC current sensor 120.
  • the control unit 140 executes protective action corresponding to the specific event.
  • the specific event may be, for example, the occurrence of a short-circuit current or an overload current.
  • the control device 300 described in this embodiment 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.
  • control device 300 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 control device 300.
  • the program can be recorded on a computer-readable recording medium (such as portable memory) and saved or distributed.
  • the program can also be provided via a network such as the Internet or email.
  • FIG. 11 is a diagram showing an example of the hardware configuration of the computer.
  • the computer in FIG. 11 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, and the like, all of which are interconnected via a bus B.
  • the computer may also be equipped with a GPU.
  • the program that realizes processing on the computer is provided by a recording medium 1001, such as a CD-ROM or memory card.
  • a recording medium 1001 such as a CD-ROM or memory card.
  • the program is installed from the recording medium 1001 to the auxiliary storage device 1002 via the drive device 1000.
  • the program does not necessarily have to be installed from the recording medium 1001; it can also be downloaded from another computer via a network.
  • the auxiliary storage device 1002 stores the installed program as well as necessary files, data, etc.
  • the memory device 1003 When an instruction to start a program is received, the memory device 1003 reads and stores the program from the auxiliary storage device 1002.
  • the CPU 1004 implements functions related to the control device 300 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, etc.
  • the display device 1006 displays a GUI (Graphical User Interface) based on the program, etc.
  • the input device 1007 is composed of a keyboard, mouse, buttons, touch panel, etc., and is used to input various operational instructions.
  • the output device 1008 outputs the results of calculations.
  • the technology described in this embodiment makes it possible to perform an appropriate protective action in response to an event that occurs in the power supply system. More specifically, since it is possible to determine whether a short-circuit current or an overload current has occurred, it becomes possible to perform an appropriate protective action in response to the event that has occurred.
  • a DC current sensor provided on the power line; an AC current sensor provided on the power line; a circuit breaker provided on the power line; a determination unit that determines that a specific event has occurred based on the measurement value of the DC current sensor and the measurement value of the AC current sensor; and a control unit that executes a protective action corresponding to the specific event.
  • the specific event is the occurrence of a short circuit current or an overload current.
  • a control device that executes control over a protection system including a DC current sensor provided on a power line, an AC current sensor provided on the power line, and a circuit breaker provided on the power line, a determination unit that determines that a specific event has occurred based on the measurement value of the DC current sensor and the measurement value of the AC current sensor; and a control unit that executes a protective operation corresponding to the specific event.
  • a control method for a protection system including a DC current sensor provided on a power line, an AC current sensor provided on the power line, and a circuit breaker provided on the power line, the method comprising: determining that a specific event has occurred based on the measurement value of the DC current sensor and the measurement value of the AC current sensor; and executing a protective action corresponding to the specific event.
  • a non-transitory storage medium storing a program for causing a computer to function as the determination unit and the control unit in the control device described in appended claim 6.

Landscapes

  • Emergency Protection Circuit Devices (AREA)

Abstract

Ce système de protection comprend : un capteur de courant CC disposé sur une ligne électrique ; un capteur de courant CA disposé sur la ligne électrique ; un disjoncteur disposé sur la ligne électrique ; une unité de détermination qui détermine qu'un événement spécifique s'est produit sur la base d'une valeur de mesure du capteur de courant CC et d'une valeur de mesure du capteur de courant CA ; et une unité de commande qui exécute une opération de protection correspondant à l'événement spécifique.
PCT/JP2024/009182 2024-03-08 2024-03-08 Système de protection, dispositif de commande, procédé de commande et programme Pending WO2025187078A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/JP2024/009182 WO2025187078A1 (fr) 2024-03-08 2024-03-08 Système de protection, dispositif de commande, procédé de commande et programme

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2024/009182 WO2025187078A1 (fr) 2024-03-08 2024-03-08 Système de protection, dispositif de commande, procédé de commande et programme

Publications (2)

Publication Number Publication Date
WO2025187078A1 true WO2025187078A1 (fr) 2025-09-12
WO2025187078A8 WO2025187078A8 (fr) 2025-10-02

Family

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Family Applications (1)

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Country Status (1)

Country Link
WO (1) WO2025187078A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007043805A (ja) * 2005-08-02 2007-02-15 Atsumi Electric Co Ltd 直流電源装置の過電流保護回路
US20110141644A1 (en) * 2009-12-15 2011-06-16 Hastings Jerome K Direct current arc fault circuit interrupter, direct current arc fault detector, noise blanking circuit for a direct current arc fault circuit interrupter, and method of detecting arc faults
JP2011217498A (ja) * 2010-03-31 2011-10-27 Ntt Facilities Inc 半導体遮断器及び直流給電システム
US20130050880A1 (en) * 2011-08-25 2013-02-28 Hamilton Sundstrand Corporation Solid state power controller for high voltage direct current systems

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007043805A (ja) * 2005-08-02 2007-02-15 Atsumi Electric Co Ltd 直流電源装置の過電流保護回路
US20110141644A1 (en) * 2009-12-15 2011-06-16 Hastings Jerome K Direct current arc fault circuit interrupter, direct current arc fault detector, noise blanking circuit for a direct current arc fault circuit interrupter, and method of detecting arc faults
JP2011217498A (ja) * 2010-03-31 2011-10-27 Ntt Facilities Inc 半導体遮断器及び直流給電システム
US20130050880A1 (en) * 2011-08-25 2013-02-28 Hamilton Sundstrand Corporation Solid state power controller for high voltage direct current systems

Also Published As

Publication number Publication date
WO2025187078A8 (fr) 2025-10-02

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