EP3306635A1 - Gleichstromschutzschalter - Google Patents

Gleichstromschutzschalter Download PDF

Info

Publication number
EP3306635A1
EP3306635A1 EP16803332.2A EP16803332A EP3306635A1 EP 3306635 A1 EP3306635 A1 EP 3306635A1 EP 16803332 A EP16803332 A EP 16803332A EP 3306635 A1 EP3306635 A1 EP 3306635A1
Authority
EP
European Patent Office
Prior art keywords
power transmission
current
direct current
circuit
wire connection
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.)
Granted
Application number
EP16803332.2A
Other languages
English (en)
French (fr)
Other versions
EP3306635B1 (de
EP3306635A4 (de
Inventor
Yushi Koyama
Ryuta Hasegawa
Naotaka Iio
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.)
Toshiba Corp
Toshiba Energy Systems and Solutions Corp
Original Assignee
Toshiba Corp
Toshiba Energy Systems and Solutions Corp
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 Toshiba Corp, Toshiba Energy Systems and Solutions Corp filed Critical Toshiba Corp
Publication of EP3306635A1 publication Critical patent/EP3306635A1/de
Publication of EP3306635A4 publication Critical patent/EP3306635A4/de
Application granted granted Critical
Publication of EP3306635B1 publication Critical patent/EP3306635B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/54—Circuit arrangements not adapted to a particular application of the switching device and for which no provision exists elsewhere
    • H01H9/541—Contacts shunted by semiconductor devices
    • H01H9/542—Contacts shunted by static switch means
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/54—Circuit arrangements not adapted to a particular application of the switching device and for which no provision exists elsewhere
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/02—Details
    • H01H33/59—Circuit arrangements not adapted to a particular application of the switch and not otherwise provided for, e.g. for ensuring operation of the switch at a predetermined point in the ac cycle
    • H01H33/596—Circuit arrangements not adapted to a particular application of the switch and not otherwise provided for, e.g. for ensuring operation of the switch at a predetermined point in the ac cycle for interrupting dc

Definitions

  • Embodiments of the present invention relate to a direct current (DC) circuit breaker suitable for a DC power transmission line network.
  • DC direct current
  • DC power transmission requires power converting devices, such as converters for converting generated AC power to DC for DC power transmission and inverters for converting transmitted DC into AC for intra-city use.
  • power converting devices such as converters for converting generated AC power to DC for DC power transmission and inverters for converting transmitted DC into AC for intra-city use.
  • a DC power transmission system can be installed with a low cost if the system is applied to long-distance and greater-scale power transmission, and it is possible to construct such a system with high efficiency and less loss in power transmission; on the other hand, it is difficult to interrupt a current in a site where a system fault occurs due to lightening strike, etc.
  • a current can be interrupted at high speed by a mechanical-contact breaker at the point where an AC current crosses a zero current for every half cycle of the AC frequency of 50 Hz or 60 Hz, whereas in a DC system, a current cannot be easily interrupted by a mechanical contact breaker because a DC current does not cross a zero current.
  • There is a way of interrupting a current using a semiconductor element however, since a large current always flows in transmission lines, a large amount of conduction loss is steadily observed in such a semiconductor element.
  • the circuit diagram (A) in FIG. 6 shows a circuit configuration of the DC circuit breaker 4, and the circuit diagram (B) in FIG. 6 specifically shows a circuit element configuration of the commutation circuit 31 (H) shown in the diagram (A) of FIG. 6 .
  • FIG. 6 only positive electrode lines of the DC power transmission lines are shown, and negative electrode lines are omitted.
  • positive electrode lines are shown and the negative electrode lines are omitted in the drawings.
  • the DC circuit breaker 4 has a circuit configuration in which two series circuits 2 each consisting of two mechanical contact type current disconnectors 21 are connected in parallel and the middle points thereof are connected by a wire connection circuit 3 consisting of a commutation circuit 31.
  • the commutation circuit 31 has a single-phase full bridge configuration, having a capacitor as a DC voltage source.
  • the DC circuit breakers 4 are inserted in series at a required point in the power transmission lines 11 of the DC power transmission line network.
  • a direct current circuit breaker that is provided at a coupling point where three or more direct current power transmission lines are electrically coupled in a direct current power transmission line network
  • the breaker comprising: three or more series circuits, each of the series circuit being connected to ends of two different direct current power transmission lines, and including a serial connection of two or more current disconnectors; and three or more wire connection circuits, one end of each of the wire connection circuits being connected to a middle point of the series circuit, and another end being connected to one point where other ends of the wire connection circuits are connected to, each of the wire connection circuits including a commutation circuit in which a current is commutated.
  • a direct current circuit breaker that is provided at a coupling point where three or more direct current power transmission lines are electrically coupled in a direct current power transmission line network
  • the breaker comprising: three or more series circuits, each of the series circuits being connected to ends of two different direct current power transmission lines, and including a serial connection of two or more elements which includes a commutation means; and three or more wire connection circuits, each of the wire connection circuits including a current disconnector, one end of the current disconnector being connected to a middle point of the series circuit, and another end being connected to one point where other ends of the current disconnectors are connected to.
  • FIG. 1 is a diagram of a configuration of a DC circuit breaker according to the first embodiment of the present invention.
  • DC circuit breakers are provided at a coupling point where three DC power transmission lines 11, 12, and 13 are electrically coupled.
  • the DC power transmission lines 11, 12, and 13 are connected to each other by series circuits 2 each consisting of two mechanical contact type current disconnectors 21.
  • the series circuits 2 at the coupling points of the three DC power transmission lines 11, 12, and 13 form a delta connection for points a, b, and c on the line paths.
  • wire connection circuit 3 including a commutation circuit 31 (H) is connected to the middle point of two mechanical contact type current disconnectors 21 in each series circuit 2, and the other end is connected to a contact point j where all the other ends of the wire connection circuits 3 are connected.
  • These wire connection circuits 3 serve as a star wire connection.
  • the commutation circuit 31 has a single-phase full bridge configuration, having a capacitor as a voltage source.
  • a not-illustrated control circuit controls an ON/OFF operation of all the mechanical contact type current disconnectors 21 of the series circuits 2 in accordance with a time when a steady operation is carried out or when a fault occurs in any of the power transmission lines.
  • the control circuit also controls an output voltage of the commutation circuit 31 in the wire connection circuit 3.
  • the control circuit turns on the mechanical contact type current disconnectors 21 in all the series circuits 2, so that a current is transmitted through the mechanical contact type current disconnectors 21.
  • control circuit controls an output voltage and an amount of current, so that the fault current (if) in the commutation circuit 31 decreases to zero. Then, at the time when a current decreases to zero, as shown in (C) of FIG. 2 , the mechanical-contact current disconnector 2b where the fault current (if) is flowing is turned off, so that the DC power transmission line 13 where the fault has occurred is cut off.
  • one mechanical contact type current disconnector 21 is provided in each series circuit 2 across a middle point from another mechanical contact type current disconnector 21; however, the series circuits 2 may be configured to be connected to two or more mechanical contact type current disconnectors 21 in series across the middle point from two or more other mechanical contact type current disconnectors 21.
  • Two or more commutation circuits 31 may be connected in series to constitute a wire connection circuit 3. If a direction of controlling a current in the commutation circuit 31 is limited, the commutation circuit 31 may be configured as a half-bridge circuit.
  • a reactor may be provided in series on the line paths connecting the points a, b, and c. This reactor can suppress a peak of an alternating current flowing in the event of a fault, and makes it easy to interrupt a current in the mechanical contact type current disconnectors 21a by decreasing a frequency of the alternating current and lowering a gradient of the alternating current.
  • FIG. 3 is a diagram showing a configuration of a DC circuit breaker according to the second embodiment. Since a basic concept is the same as the configuration illustrated in FIG. 1 , the constituent elements the same as or corresponding to those of the DC circuit breaker illustrated in FIG. 1 will be referred to by the same reference symbols as those used in FIG. 1 .
  • the present embodiment discloses a configuration example of the DC circuit breakers at the coupling point of four DC power transmission lines 11-14. At the coupling point, two neighboring lines of the DC power transmission lines 11-14 are connected by series circuits 2 each consisting of two mechanical contact type current disconnectors 21.
  • One end of the wire connection circuit 3 including a commutation circuit 31 (H) is connected to the middle point of two mechanical contact type current disconnectors 21 in each series circuit 2, and the other end is connected to a contact point j where all the other ends of the wire connection circuits 3 are connected.
  • the commutation circuit 31 has a single-phase full bridge configuration, having a capacitor as a voltage source.
  • a not-illustrated control circuit controls an ON/OFF operation of all the mechanical contact type current disconnectors 21 of the series circuits 2 in accordance with a time when a steady operation is carried out or when a fault occurs in any of the power transmission lines.
  • the control circuit also controls an output voltage of the commutation circuit 31 in the wire connection circuit 3.
  • the current interruption operation in the present DC circuit breaker is similar to that in the first embodiment, and even when a fault occurs in any of the DC power transmission lines 11-14, the DC power transmission line where the fault has occurred can be cut off in a short time.
  • n series circuits 2 consisting of mechanical contact type current disconnectors 21 are required. In contrast, only a half of the number, that is, n series circuits 2 are required in the present embodiment.
  • a configuration similar to the present embodiment can reduce the number of components by half.
  • the DC power transmission line 11 is connected to the DC power transmission lines 13 and 14 by the series circuits 2, for example; however, since all the DC power transmission lines 11-14 are equivalent, the DC power transmission lines 12 and 13, or the DC power transmission lines 12 and 14 may be connected to the DC power transmission line 11 by the series circuits 2. The same applies to the other DC power transmission lines.
  • FIG. 4 is a diagram showing a configuration of a DC circuit breaker according to the third embodiment. Since a basic concept is the same as the configuration illustrated in FIG. 1 , the constituent elements the same as or corresponding to those of the DC circuit breaker illustrated in FIG. 1 will be referred to by the same reference symbols as those used in FIG. 1 .
  • the DC circuit breakers connect the DC power transmission lines 11, 12, and 13 by the series circuits 2 each consisting of the reactor 22 and the semiconductor circuit breaker 23 at the coupling point where three DC power transmission lines 11, 12, and 13 are electrically connected.
  • each semiconductor circuit breaker 23 is connected in series in such a manner that two semiconductor switching elements 231 are directed in opposite directions, and an arrestor 232 is connected the semiconductor switching elements 231 in parallel.
  • the series circuits 2 at the coupling point of the three DC power transmission lines 11, 12, and 13 form a delta connection for points a, b, and c on the line paths.
  • One end of the wire connection circuit 3 including a commutation circuit 32 is connected to the middle point of the reactor 22 and the semiconductor circuit breaker 23 in each series circuit 2, and the other end is connected to a contact point j where all the other ends of the wire connection circuits 3 are connected.
  • These wire connection circuits 3 serve as a star wire connection.
  • a not-illustrated control circuit controls an ON/OFF operation of all the semiconductor circuit breakers 23 of the series circuits 2 in accordance with a time when a steady operation is carried out or when a fault occurs in any of the power transmission lines.
  • the control circuit also controls an ON/OFF operation of the mechanical-contact current disconnector 32 in the wire connection circuit 3.
  • control circuit turns on all the mechanical contact type current disconnectors 32 but turns off all the semiconductor circuit breakers 23, so that a current is transmitted through the mechanical-contact current disconnectors 32 and the reactors 22.
  • a fault current flows toward the DC power transmission line where the fault occurs.
  • the control circuit detects the fault, the control circuit turns on the semiconductor circuit breaker 23 connected to a DC power transmission line where the fault occurs. Then, the fault current (if) flowing in the reactor 22 and the mechanical-contact current disconnector 32 that are connected to the DC power transmission line where the fault has occurred flows in the semiconductor circuit breaker 23 that is turned on. At this time, at this instance when a zero current flows in the mechanical-contact current disconnector 32, the control circuit turns off the mechanical-contact current disconnector 32. Next, the semiconductor circuit breaker 23 to which the flow of the fault current has been shifted is turned off. The DC power transmission line where the fault has occurred can be thereby cut off.
  • semiconductor switching elements 231 may be connected in series. If a direction of controlling a current is limited, the elements may be configured to be directed in one direction only.
  • the arrestor 232 may be connected in parallel to each of the semiconductor switching elements 231 or to a plurality of the semiconductor switching elements 231, or two or more semiconductor circuit breaker 23 may be connected in series.
  • FIG. 5 is a diagram showing a configuration of a DC circuit breaker according to the fourth embodiment. Since a basic concept is the same as the configuration illustrated in FIG. 1 , the constituent elements the same as or corresponding to those of the DC circuit breaker illustrated in FIG. 1 will be referred to by the same reference symbols as those used in FIG. 1 .
  • the DC circuit breaker is configured in such a manner that two reactors 22 and two semiconductor circuit breakers 23 are alternately connected in each series circuit 2.
  • One end of each of the mechanical-contact current disconnectors 32 is connected to each of the middle points e, f, and g of the series circuits 2, and all the other ends of the mechanical-contact current disconnectors 32 are connected to each other at the contact point j.
  • each of the mechanical-contact current disconnector 33 is connected to the joint point of the semiconductor circuit breaker 23 and the reactor 22 not connected to one the middle points e, f, g of the series circuits 2, and the other end is connected to the coupling point of the reactor 22 and the semiconductor circuit breaker 23 of an adjacent series circuit 2.
  • the mechanical-contact current disconnector 33 connects the joint points of the reactors 22 and the semiconductor circuit breakers 23 belonging to the series circuits 2 bifurcated from the same DC power transmission line.
  • a not-illustrated control circuit controls an ON/OFF operation of all the semiconductor circuit breakers 23 of the series circuits 2 in accordance with a time when a steady operation is carried out or when a fault occurs in any of the power transmission lines.
  • the control circuit also controls an ON/OFF operation of the mechanical-contact current disconnectors 32 and 33 in the wire connection circuit 3.
  • the current interruption operation in the present DC circuit breaker is similar to that in the third embodiment, and even when a fault occurs in any of the DC power transmission lines, the DC power transmission line where the fault has occurred can be cut off.
  • required insulation resistance is decreased as a voltage applied to the mechanical-contact current disconnectors 32 and 33 is low. For this reason, it is possible to use mechanical-contact current disconnectors 32 that are inexpensive and slow in opening/closing by shortening an insulation distance, thereby constructing a DC circuit breaker with a lower cost.
  • a bridge circuit consisting of a series circuit 2 and a wire connection circuit 3 may be configured as a multiple-stage circuit.
  • the current interruption operation in the present DC circuit breaker is similar to that in the fourth embodiment, and even when a fault occurs in any of the DC power transmission lines, the DC power transmission line where the fault has occurred can be cut off.
  • a multiple-stage bridge circuit further lowers a voltage applied to the mechanical contact type current disconnector, and thus, it becomes possible to construct a DC circuit breaker with a further lower cost by using a mechanical contact type current disconnector that is cheap and slow in in opening/closing.
  • the series circuits 2 and the wire connection circuits 3 may be replaced with the constituent elements of the first embodiment to configure a DC circuit breaker in a similar manner.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
  • Keying Circuit Devices (AREA)
EP16803332.2A 2015-06-02 2016-05-31 Gleichstromschutzschalter Active EP3306635B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2015112055A JP6591204B2 (ja) 2015-06-02 2015-06-02 直流電流遮断装置
PCT/JP2016/066018 WO2016194898A1 (ja) 2015-06-02 2016-05-31 直流電流遮断装置

Publications (3)

Publication Number Publication Date
EP3306635A1 true EP3306635A1 (de) 2018-04-11
EP3306635A4 EP3306635A4 (de) 2019-01-09
EP3306635B1 EP3306635B1 (de) 2019-10-30

Family

ID=57441459

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16803332.2A Active EP3306635B1 (de) 2015-06-02 2016-05-31 Gleichstromschutzschalter

Country Status (3)

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EP (1) EP3306635B1 (de)
JP (1) JP6591204B2 (de)
WO (1) WO2016194898A1 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3094136A1 (fr) * 2019-03-22 2020-09-25 Supergrid Institute Dispositif de coupure de courant pour courant continu haute tension avec résonateur et commutation
US11069502B2 (en) 2018-04-19 2021-07-20 Mitsubishi Electric Corporation DC circuit breaker
US11791617B2 (en) 2018-12-27 2023-10-17 Supergrid Institute Current cut-off device for high-voltage direct current with capacitive buffer circuit, and control method
US11824346B2 (en) 2018-12-27 2023-11-21 Supergrid Institute Current cut-off device for high-voltage direct current with adaptive oscillatory circuit, and control method

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6844352B2 (ja) * 2017-03-17 2021-03-17 株式会社明電舎 直流遮断装置
WO2019035180A1 (ja) * 2017-08-15 2019-02-21 株式会社東芝 直流電流遮断装置
JP7134375B1 (ja) * 2021-09-27 2022-09-09 三菱電機株式会社 直流遮断器
WO2024084643A1 (ja) * 2022-10-20 2024-04-25 株式会社東芝 直流電流遮断装置

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55121232A (en) * 1979-03-10 1980-09-18 Tokyo Shibaura Electric Co Multiterminal system dc breaker
JPS5790830A (en) * 1980-11-26 1982-06-05 Tokyo Shibaura Electric Co Dc breaker
JPS6344909Y2 (de) * 1987-04-23 1988-11-22
ES2585840T3 (es) * 2012-03-09 2016-10-10 Siemens Aktiengesellschaft Dispositivo para conmutar una corriente continua en un polo de una red de tensión continua
WO2014038008A1 (ja) * 2012-09-05 2014-03-13 三菱電機株式会社 直流遮断器
CN104838462B (zh) * 2012-12-19 2017-05-24 西门子公司 用于在直流电网的一个极中切换直流电流的设备
JP6109649B2 (ja) * 2013-05-31 2017-04-05 株式会社東芝 直流電流遮断装置

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11069502B2 (en) 2018-04-19 2021-07-20 Mitsubishi Electric Corporation DC circuit breaker
US11791617B2 (en) 2018-12-27 2023-10-17 Supergrid Institute Current cut-off device for high-voltage direct current with capacitive buffer circuit, and control method
US11824346B2 (en) 2018-12-27 2023-11-21 Supergrid Institute Current cut-off device for high-voltage direct current with adaptive oscillatory circuit, and control method
FR3094136A1 (fr) * 2019-03-22 2020-09-25 Supergrid Institute Dispositif de coupure de courant pour courant continu haute tension avec résonateur et commutation
WO2020193906A1 (fr) * 2019-03-22 2020-10-01 Supergrid Institute Dispositif de coupure de courant pour courant continu haute tension avec résonateur et commutation
US11798763B2 (en) 2019-03-22 2023-10-24 Supergrid Institute Current cut-off device for high-voltage direct current with resonator and switching

Also Published As

Publication number Publication date
JP6591204B2 (ja) 2019-10-16
WO2016194898A1 (ja) 2016-12-08
EP3306635B1 (de) 2019-10-30
JP2016225198A (ja) 2016-12-28
EP3306635A4 (de) 2019-01-09

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