WO2020186652A1 - Nouveau disjoncteur à courant continu - Google Patents

Nouveau disjoncteur à courant continu Download PDF

Info

Publication number
WO2020186652A1
WO2020186652A1 PCT/CN2019/093033 CN2019093033W WO2020186652A1 WO 2020186652 A1 WO2020186652 A1 WO 2020186652A1 CN 2019093033 W CN2019093033 W CN 2019093033W WO 2020186652 A1 WO2020186652 A1 WO 2020186652A1
Authority
WO
WIPO (PCT)
Prior art keywords
switch
circuit breaker
branch
transfer
electronic
Prior art date
Application number
PCT/CN2019/093033
Other languages
English (en)
Chinese (zh)
Inventor
吴小钊
张�杰
纪江辉
王小丽
李长鹏
李树昆
曹善军
姜亚军
王其中
李俊豪
Original Assignee
许继集团有限公司
许昌许继软件技术有限公司
许继电气股份有限公司
国家电网有限公司
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 许继集团有限公司, 许昌许继软件技术有限公司, 许继电气股份有限公司, 国家电网有限公司 filed Critical 许继集团有限公司
Publication of WO2020186652A1 publication Critical patent/WO2020186652A1/fr

Links

Images

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
    • H02H3/08—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
    • H02H3/087—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 for dc applications
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
    • H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage

Definitions

  • the utility model relates to a new type of direct current circuit breaker, which belongs to the technical field of direct current transmission.
  • a high-voltage DC fast circuit breaker discloses a high-voltage DC fast circuit breaker as shown in Fig. 1, including a mechanical isolating switch QS and a high-voltage electronic switch (such as a dashed box Shown inside) and medium and low voltage DC circuit breaker QK; wherein, the mechanical isolating switch QS and the medium and low voltage DC circuit breaker QK are connected in series to form the main branch, and the transfer branch formed by the high voltage electronic switch is connected in parallel with the main branch.
  • the high-voltage electronic switch is formed by at least two valve sections in series, and each valve section is formed by a lightning arrester and at least one set of series-connected shut-off high-power electronic components in parallel.
  • the high-power resistance element that can be turned off is IGBT, IECT or GTO.
  • the main branch adopts a medium and low voltage DC circuit breaker with arc extinguishing capability.
  • the current of the main branch depends on the arc voltage of the medium and low voltage DC circuit breaker to be higher than the conduction of the transfer branch.
  • the voltage drop completes the transfer, but in the medium and high voltage field, the single fracture arc voltage of the main branch is generally about 20V, and the conduction voltage drop of the transfer branch is proportional to the number of power devices in the transfer branch (single power device The conduction voltage drop is about 3V). If multiple power devices are connected in series to make the conduction voltage drop of the transfer branch exceed the single-break arc voltage of the main branch by 20V, the current of the main branch cannot be reliably transferred to the transfer branch. This leads to failure of breaking.
  • the purpose of the utility model is to provide a new type of DC circuit breaker, which is used to solve the problem that the current DC circuit breaker has too many power devices connected in series in the transfer branch, because the conduction voltage drop of the transfer branch exceeds the main The single-fracture arc voltage of the branch cannot realize the problem of reliable breaking.
  • the present invention provides a new type of DC circuit breaker, including a main branch and a transfer branch connected in parallel with the main branch.
  • the main branch is composed of a first switch and a circuit breaker switch in series, and the transfer branch is provided with A first electronic switch, the circuit breaker switch is connected in parallel with a second electronic switch, the second electronic switch is composed of at least one switchable electronic component, and the conduction voltage of the second electronic switch is lower than the single break of the main branch Arc voltage.
  • the beneficial effect of the utility model is that by adding a second electronic switch arranged in parallel with the circuit breaker switch, when a short circuit fault occurs in the DC line, the current of the main branch is quickly transferred to the one whose conduction voltage is lower than that of the main branch.
  • the second electronic switch with single-break arc voltage after the circuit breaker switch is extinguished, by turning off the second electronic switch, the current of the main branch is transferred to the transfer branch, and the short-circuit current is interrupted by the first electronic switch.
  • the novel DC circuit breaker of the present invention can still achieve reliability under the condition that the number of power devices connected in series in the transfer branch is too large, that is, the conduction voltage drop of the transfer branch exceeds the single-break arc voltage of the main branch. Switch off.
  • the first electronic switch is composed of at least one bridge transfer circuit, and the bridge transfer circuit has a parallel connection.
  • the first bridge arm and the second bridge arm are formed by two diodes connected in series in the same direction, and the second bridge arm is formed by connecting two other diodes in series in the same direction;
  • the series point of the two diodes is the input/output end of the bridge transfer circuit, and the series point of the two diodes of the second bridge arm is the output/input end of the bridge transfer circuit;
  • the bridge transfer circuit further includes The switchable branch is connected in parallel with the first bridge arm and the second bridge arm, and the switchable branch is formed by at least one switchable electronic component.
  • the first electronic switch is composed of at least one valve section, and each valve section is composed of a lightning arrester and at least A group of series-connected turn-off electronic components are formed in parallel.
  • the first switch is a switch with arc resistance.
  • the switch with arc resistance is a vacuum circuit breaker or an SF6 circuit breaker.
  • the switchable electronic component is an IGBT, IECT or GTO.
  • Figure 1 is a circuit diagram of a high-voltage DC fast circuit breaker in the prior art
  • Figure 2 is a circuit schematic diagram of the novel DC circuit breaker in embodiment 1 of the utility model
  • Figure 3 is a circuit schematic diagram of the novel DC circuit breaker in the second embodiment of the utility model
  • 1 is the first switch
  • 2 is the circuit breaker switch
  • 3 is the second electronic switch
  • 4-1 is the first electronic switch
  • 4-2 is the first electronic switch
  • 5 is the lightning arrester
  • 6 is the switch-off electronic element.
  • New type DC circuit breaker embodiment 1
  • the new DC circuit breaker of this embodiment includes a main branch and a transfer branch connected in parallel with the main branch.
  • the main branch is composed of a first switch 1 and a circuit breaker switch 2 (ie, medium and low voltage DC circuit breaker) in series.
  • the circuit breaker switch 2 is connected in parallel with a second electronic switch 3
  • the second electronic switch 3 is composed of two switchable electronic components 6 in reverse series, and the two switchable electronic components in reverse series are also connected in parallel with a lightning arrester and a lightning arrester It is used to release the overvoltage on the switchable electronic component. If there is no overvoltage problem on the switchable electronic component, the lightning arrester may not be connected in parallel; the first electronic switch 4-1 is provided in the transfer branch.
  • the electronic switch 4-1 is composed of three valve sections in series, and each valve section is formed by a lightning arrester 5 and a set of series-connected turn-off electronic components 6 in parallel. In this embodiment, two turn-off electronic components 6 are reversed. Concatenated into a group.
  • the medium and low voltage DC circuit breaker is a low voltage DC circuit breaker that is lower than the rated DC voltage of the system and has the ability to eliminate DC arcs. Its breaking current is very fast. This kind of equipment can be directly selected and purchased with low cost.
  • the turn-off electronic component 6 is an IGBT; as another embodiment, the turn-off electronic component 6 may also be an IECT or GTO.
  • the first switch 1 is a vacuum circuit breaker or an SF6 circuit breaker, etc.
  • the first switch 1 also has an arc resistance capability; as other embodiments, the first switch 1 can also adopt other existing technologies with resistance to arcs. Switches with arc capability are equivalently replaced, such as air dielectric contacts and arc extinguishing grids.
  • the second electronic switch 3 is composed of two switchable electronic components 6 in reverse series, and its conduction voltage is lower than the single-break arc voltage of the main branch.
  • the single-break arc voltage refers to the circuit breaker switch 2.
  • Fracture arc voltage as another embodiment, in the case of ensuring that the conduction voltage of the second electronic switch 3 is lower than the single-break arc voltage of the main branch, the second electronic switch 3 may be composed of a switchable electronic component 6; or It is composed of at least two switchable electronic components 6 in parallel in the same direction; or at least two valve segments are connected in series, and each valve segment is composed of two switchable electronic components 6 in reverse series.
  • the first electronic switch 4-1 may also be composed of one valve section or at least two valve sections in series, and each valve section is formed by a lightning arrester 5 and at least one set of series-connected switchable electronic components 6 in parallel. , Wherein two switchable electronic components 6 are connected in reverse series to form a group.
  • the opening operation process of the new DC circuit breaker is as follows: the controller sends a command to open the first switch 1, the circuit breaker switch 2 (specifically, the first switch 1 can be opened first, and the circuit is opened. After the switch 2 of the circuit breaker is opened; or the first switch 1 and the circuit breaker switch 2 are opened at the same time), the second electronic switch 3 and the first electronic switch 4-1 can be controlled to conduct at the same time.
  • the arc voltage causes the main branch current to automatically transfer to the second electronic switch 3, and the circuit breaker switch 2 extinguishes the arc; then after a delay of the set time, the controller controls the second electronic switch 3 to turn off, and the second electronic switch 3 generates Overvoltage causes the current of the main branch to be transferred to the first electronic switch 4-1. At this time, the current of the main branch is turned off and an isolated port is generated; then, the controller controls the first electronic switch 4-1 to turn off. After the electronic switch 4-1 is turned off, the remaining energy is absorbed by the arrester in the first electronic switch 4-1, thereby completing the breaking of the short-circuit current.
  • the reason why the second electronic switch 3 is controlled to be turned off after the set time delay is to ensure that the short-circuit current in the main branch can be completely transferred to the second electronic switch 3 to increase the short-circuit current Breaking reliability, the length of the set time can be set artificially according to the test results or experience.
  • the new DC circuit breaker In order to prevent the opening operation of the new DC circuit breaker from misjudgment of the short-circuit fault, the new DC circuit breaker also has a fast reclosing function.
  • the fast reclosing process is: when the new DC circuit breaker completes the first short circuit After the current is interrupted, if fast reclosing is required, after the set delay time (up to several milliseconds), the first electronic switch 4-1 is closed again to turn on the transfer branch. If there is still a short-circuit current in the system, then The first electronic switch 4-1 completes the breaking of the short-circuit current again; if there is no short-circuit current in the system, after a set delay time, the circuit breaker switch 2 and the first switch 1 are closed in sequence.
  • the length of the set delay time in the rapid reclosing process can be set artificially according to the test results or experience.
  • the conduction voltage of the second electronic switch 3 is reduced to the single-break arc voltage of the main branch, so that when a short-circuit fault occurs in the DC line ,
  • the main branch current can be reliably transferred to the second electronic switch 3, and then transferred to the transfer branch to be broken, ensuring that the conduction voltage drop of the new DC circuit breaker in the transfer branch exceeds that of the main branch.
  • reliable breaking can still be achieved.
  • New type DC circuit breaker embodiment 2
  • a first electronic switch 4-2 is provided in the transfer branch, and the first electronic switch 4-2 is composed of a bridge transfer circuit.
  • the type transfer circuit has a first bridge arm and a second bridge arm connected in parallel.
  • the first bridge arm is formed by two diodes connected in series in the same direction, and the second bridge arm is formed by two other diodes connected in series in the same direction;
  • the series connection point of the two diodes is the input/output end of the bridge transfer circuit, and the series connection point of the two diodes of the second bridge arm is the output/input end of the bridge transfer circuit;
  • the bridge transfer circuit also includes the connection with the first bridge arm ,
  • the second bridge arm is connected in parallel with a switchable branch, and the switchable branch is composed of a switchable electronic component.
  • the number of diodes in the first bridge arm and the second bridge arm can be adjusted according to actual needs, and is not limited to the two in this embodiment; the turn-off branch can also have at least two turn-off branches.
  • the electronic components are formed in parallel in the same direction.
  • the transfer branch in the new DC circuit breaker can also be connected in series with multiple sets of first electronic switches 4-2; the first electronic switches 4-2 can also adopt bridge transfer circuits of other structures, for example, by combining this embodiment
  • the diodes in the first bridge arm and the second bridge arm are replaced with a bridge transfer circuit obtained by semi-controlled electronic components.

Landscapes

  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)

Abstract

L'invention concerne un nouveau disjoncteur à courant continu associé au domaine technique de la transmission de puissance en courant continu. Le nouveau disjoncteur à courant continu comprend une branche principale et une branche de transfert connectée en parallèle à la branche principale, la branche principale étant composée d'un premier commutateur et d'un commutateur de disjoncteur connectés en série, un premier commutateur électronique étant disposé dans la branche de transfert, et un second commutateur électronique étant connecté en parallèle au commutateur de disjoncteur, le second commutateur électronique étant composé d'au moins un composant électronique d'arrêt, et la chute de tension de conduction du second commutateur électronique étant inférieure à la tension d'arc de rupture unique de la branche principale. Le présent disjoncteur de courant continu peut réaliser une disjonction fiable même lorsqu'il y a trop de dispositifs de puissance connectés en série dans la branche de transfert et lorsque la chute de tension de conduction de la branche de transfert dépasse la tension d'arc de rupture unique de la branche principale.
PCT/CN2019/093033 2019-03-21 2019-06-26 Nouveau disjoncteur à courant continu WO2020186652A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201920365060.1U CN209929952U (zh) 2019-03-21 2019-03-21 一种新型直流断路器
CN201920365060.1 2019-03-21

Publications (1)

Publication Number Publication Date
WO2020186652A1 true WO2020186652A1 (fr) 2020-09-24

Family

ID=69070930

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2019/093033 WO2020186652A1 (fr) 2019-03-21 2019-06-26 Nouveau disjoncteur à courant continu

Country Status (2)

Country Link
CN (1) CN209929952U (fr)
WO (1) WO2020186652A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110176749A (zh) * 2019-03-21 2019-08-27 许继集团有限公司 新型直流断路器

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103647248A (zh) * 2013-11-14 2014-03-19 许继集团有限公司 一种高压直流快速断路器
US20150092311A1 (en) * 2013-09-30 2015-04-02 Abb Technology Ag Methods, systems, and computer readable media for protection of direct current building electrical systems
US20160285250A1 (en) * 2013-10-07 2016-09-29 Korea Electrotechnology Research Institute High-voltage dc current breaker and high-voltage dc current breaking method
CN107482576A (zh) * 2017-09-15 2017-12-15 浙江大学 一种混合式高压直流断路器的启动控制策略
CN109314004A (zh) * 2016-06-22 2019-02-05 伊顿智能动力有限公司 混合直流断路器
CN109904832A (zh) * 2019-04-23 2019-06-18 国网江苏省电力有限公司 一种直流断路器及其控制方法

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150092311A1 (en) * 2013-09-30 2015-04-02 Abb Technology Ag Methods, systems, and computer readable media for protection of direct current building electrical systems
US20160285250A1 (en) * 2013-10-07 2016-09-29 Korea Electrotechnology Research Institute High-voltage dc current breaker and high-voltage dc current breaking method
CN103647248A (zh) * 2013-11-14 2014-03-19 许继集团有限公司 一种高压直流快速断路器
CN109314004A (zh) * 2016-06-22 2019-02-05 伊顿智能动力有限公司 混合直流断路器
CN107482576A (zh) * 2017-09-15 2017-12-15 浙江大学 一种混合式高压直流断路器的启动控制策略
CN109904832A (zh) * 2019-04-23 2019-06-18 国网江苏省电力有限公司 一种直流断路器及其控制方法

Also Published As

Publication number Publication date
CN209929952U (zh) 2020-01-10

Similar Documents

Publication Publication Date Title
EP2953150B1 (fr) Appareil de limitation de courant d'un circuit ou de coupure de courant, et son procédé de commande
US9634476B1 (en) Apparatus for breaking line bidirectional current and control method thereof
US11038338B2 (en) Micro-loss combined mechanical DC circuit breaker and its control method
CN108597926A (zh) 一种混合式直流断路器拓扑结构及其控制方法
CN105720552B (zh) 一种限流式高压直流断路器
CN103647248B (zh) 一种高压直流快速断路器
CN110739167A (zh) 一种直流开关设备
CN107294054A (zh) 一种双臂架构的快速混合型直流断路器的拓扑结构
CN102074394B (zh) 灭弧开关及其切换方法
CN106356817A (zh) 一种桥式双向无弧直流断路器
CN106207991A (zh) 一种双向高压直流混合式断路器
CN105680411A (zh) 直流固态断路器及断路控制方法
CN112086939B (zh) 一种机械开关并联的自然换流型直流断路器及控制方法
WO2014117608A1 (fr) Appareil pour interrompre le courant d'un circuit et procédé de commande de celui-ci
CN111640602A (zh) 转移支路振荡电流可控的多断口直流开关设备及控制方法
WO2020186652A1 (fr) Nouveau disjoncteur à courant continu
CN206533122U (zh) 一种基于限流氧化锌fr的高压限流装置
CN110311354A (zh) 一种中压大容量混合直流断路器及限流分断方法
CN110880745B (zh) 基于双电容振荡的主动型阻容式直流限流器及控制方法
CN206533121U (zh) 一种基于限流氧化锌fr的母线电压保持装置
CN112421589B (zh) 一种分级关断的混合式直流断路器
CN113013831B (zh) 基于主被动结合保护的混合式直流断路器故障保护方法
CN106849022A (zh) 一种基于限流氧化锌fr的母线电压保持装置
CN112086943B (zh) 一种主动式故障限流电路及全固态直流断路器
CN110176749A (zh) 新型直流断路器

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 19920320

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 19920320

Country of ref document: EP

Kind code of ref document: A1