WO2015023157A1 - 고전압 dc 차단기 - Google Patents
고전압 dc 차단기 Download PDFInfo
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- WO2015023157A1 WO2015023157A1 PCT/KR2014/007604 KR2014007604W WO2015023157A1 WO 2015023157 A1 WO2015023157 A1 WO 2015023157A1 KR 2014007604 W KR2014007604 W KR 2014007604W WO 2015023157 A1 WO2015023157 A1 WO 2015023157A1
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- main switch
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- 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
- H02H3/16—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 fault current to earth, frame or mass
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- 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
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- 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
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- 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
- H01H33/53—Cases; Reservoirs, tanks, piping or valves, for arc-extinguishing fluid; Accessories therefor, e.g. safety arrangements, pressure relief devices
- H01H33/56—Gas reservoirs
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- 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
- H02H3/021—Details concerning the disconnection itself, e.g. at a particular instant, particularly at zero value of current, disconnection in a predetermined order
Definitions
- the present invention relates to a high voltage direct current (DC) circuit breaker, and more particularly, to a high voltage DC circuit breaker that blocks a fault current flowing in a DC line when a fault occurs on one side of a DC line for transmission or distribution.
- DC direct current
- a high voltage DC circuit breaker is a switching device capable of blocking a current flowing through a high voltage transmission line of about 50 mA or more, such as a high voltage direct current (HVDC) transmission system.
- This high voltage DC circuit breaker serves to block the fault current in the event of a fault in the DC line.
- the present invention can also be applied to a medium voltage DC power distribution system having a DC voltage level of about 1 to 50 mA.
- an object of the present invention is to provide a high voltage DC circuit breaker capable of completely blocking a fault current in the main switch even when a high voltage DC circuit breaker does not apply a resonance current to the main switch.
- Another object of the present invention is to provide a high voltage DC circuit breaker capable of blocking fault currents in both directions with a single circuit.
- the present invention has an additional object to provide a high voltage DC circuit breaker to apply a small number of semiconductor devices to block the fault current.
- Another object of the present invention is to provide a high voltage DC circuit breaker implemented to perform a reclosing operation through a main switch.
- a high voltage DC circuit breaker for blocking a current flowing in a DC line, the high voltage DC circuit breaker comprising: a main switch installed at the DC line and open when a failure occurs on one side or the other side of the DC line to cut off the current of the DC line; A nonlinear resistor connected in parallel to the main switch; An LC circuit connected to said main switch and including a capacitor and a reactor connected in series for generating LC resonance; A first bidirectional switching element connected in series with the LC circuit to switch a bidirectional current flow; And a second bidirectional switching device connected to the LC circuit in parallel to switch the current flow to achieve LC resonance in both directions. It includes.
- the charging resistor for charging a DC voltage (Vc) to the capacitor at initial startup, the charging resistor is installed between the contact between the LC circuit and the first bi-directional switching element and the ground (GND) do.
- each of the first and second bidirectional switching elements includes a pair of power semiconductor switches, each of which can be turned on or turned on / off, and the pair of power semiconductor switches are connected in parallel in opposite directions.
- the power semiconductor switch (G1-G2) of the first bidirectional switching device is After the power semiconductor switch G4 of one of the second bidirectional switching devices is turned on in the OFF state, a voltage of -Vc is charged to the capacitor by LC resonance between the reactor and the capacitor of the LC circuit.
- the power semiconductor switch G4 is turned off, and the power semiconductor switch G2 of one of the first bidirectional switching elements is turned on to supply current to the main switch by the voltage -Vc charged to the capacitor.
- the supplied current becomes a zero current in the main switch so that the arc generated in the main switch is extinguished.
- the current supplied to the main switch by -Vc charged by the capacitor is opposite in direction to the fault current sustained through the arc in the main switch and is larger in magnitude.
- the power semiconductor switch G2 is turned OFF after the capacitor is recharged to + Vc.
- the power semiconductor switch G3-G4 of the second bidirectional switching element when the main switch is opened due to a failure on the other side of the DC line and an arc occurs when the main switch is opened, the power semiconductor switch G3-G4 of the second bidirectional switching element is In the OFF state, the power semiconductor switch G1 of one of the first bidirectional switching devices is turned ON to supply current to the main switch by a + Vc voltage precharged to a capacitor of the LC circuit. By the supplied current, the main switch 110 becomes a zero current so that the arc generated in the main switch is extinguished.
- the current supplied to the main switch by + Vc precharged by the capacitor is opposite in direction and larger in magnitude to the fault current sustained through the arc in the main switch.
- the capacitor of the LC circuit is charged to ⁇ Vc by the voltage of one side that is relatively higher than the other side of the DC line, and then the power semiconductor switch G1 is OFF, after which the power semiconductor switch G3 of one of the second bidirectional switching elements is turned ON to recharge the + Vc voltage to the capacitor by LC resonance between the capacitor and the reactor of the LC circuit. do.
- the voltage at one side that is relatively higher than the other side of the DC line is consumed in the nonlinear resistor.
- the present invention allows the arc to be easily and quickly extinguished when an arc occurs during the switching operation of the main switch in the high voltage DC circuit breaker to completely block the fault current.
- the high voltage DC circuit breaker is implemented by minimizing the number of electric devices, the size and cost of the circuit breaker can be reduced.
- the blocking operation can be performed again.
- FIG. 1 is a block diagram of a conventional high voltage DC circuit breaker.
- FIG. 2 is a block diagram of a high-voltage DC circuit breaker according to an embodiment of the present invention.
- Figure 3 is a schematic diagram showing a fault current blocking process in the high voltage DC circuit breaker when a fault occurs on one side of the high voltage DC line according to the present invention.
- FIG. 4 is a schematic diagram showing a fault current blocking process in a high voltage DC circuit breaker when a fault occurs on the other side of the high voltage DC line according to the present invention.
- FIG. 2 is a block diagram of a high voltage DC circuit breaker according to an exemplary embodiment of the present invention.
- the high voltage DC circuit breaker 100 includes a main switch 110 installed on the DC line 10 connecting the A side and the B side.
- the main switch 110 basically serves to block the DC line 10 so that a fault current does not continuously flow into a circuit in which a fault occurs when a fault occurs in the A side or the B side. To this end, the main switch 110 is closed in the normal state and is opened when a failure occurs.
- the main switch 110 is controlled by the control signal of the control unit (not shown).
- the nonlinear resistor 120 is connected to the main switch 110 in parallel to prevent excessive voltage above the rated voltage from being applied to both ends of the high voltage DC circuit breaker 100 when the main switch 110 is blocked.
- the nonlinear resistor 120 may be implemented as, for example, a varistor.
- the series connection of the LC circuit 130 and the first bidirectional switching device 140 is connected in parallel to the main switch 110.
- the second bidirectional switching device 150 is connected in parallel to the LC circuit 130.
- the LC circuit 130 is configured by connecting the capacitor 131 and the reactor 132 in series.
- Each bidirectional switching device 150 and 160 has a structure in which two power semiconductor switches G1 to G4 are connected in parallel so that current flows in both directions, and they are arranged in opposite directions.
- the operations of the power semiconductor switches G1 to G4 are controlled by a controller (not shown).
- the power semiconductor switches G1 to G4 are turn-on controllable devices, for example, may be implemented as a thyristor.
- the turn-on / turn-off controllable element may be implemented by, for example, GTO, IGCT, IGBT, or the like.
- the charging resistor 160 is connected between the LC circuit 130 and the contact of the first bidirectional switching element 140 and the ground GND.
- the charging resistor 160 allows the capacitor 131 of the LC circuit 130 to be initially charged by the DC voltage Vc.
- FIG. 3 is a schematic diagram showing a fault current blocking process when a fault occurs in one side B of the high voltage DC breaker according to an embodiment of the present invention
- FIG. 4 is the other side A of the high voltage DC breaker according to another embodiment of the present invention. Is a schematic diagram showing the fault current blocking process in case of fault.
- the main switch 110 is closed.
- the first bidirectional switching device 140 and the second bidirectional switching device 150 are turned off and blocked. Accordingly, when a voltage is applied to the DC line 10, the normal current flows along the DC line 10 through the main switch 110, and the capacitor 131 and the reactor 132 of the LC circuit 130, The DC voltage Vc is charged in the capacitor 131 through the charging resistor 160.
- the controller detects a failure and opens the main switch 110.
- the main switch 110 is opened, an arc occurs between the switching terminals of the main switch 110 so that a fault current flows continuously from A to B.
- the power semiconductor switches G1 and G2 connected in parallel with each other in the first bidirectional switching device 140 are turned off, and the power semiconductor switch G4 at the bottom of the second bidirectional switching device 150 is turned on.
- LC resonance occurs between the reactor 132 and the capacitor 131 through the lower power semiconductor switch G4, and the voltage of the capacitor 131 becomes -Vc.
- the lower power semiconductor switch G4 is turned off and the power semiconductor switch G2 on the right side of the first bidirectional switching element 140 is turned on and is charged by the -Vc voltage charged in the capacitor 131.
- Current is supplied to the B side through the power semiconductor switch G2 on the right side.
- the current supplied in this way the current in the main switch 110 becomes 0 (zero) and the arc is extinguished.
- the current supplied to the B side as described above is the opposite direction and the fault current that is sustained through the arc in the main switch 110 is preferably larger in size. To this end, the charging capacity of the capacitor can be determined.
- the voltage of the A side is rapidly increased relative to the B side.
- the voltage on the A side increased in this manner is consumed by the nonlinear resistor 120 connected in parallel to the main switch 110, and the capacitor 131 is recharged to + Vc through the LC circuit 130 and the first bidirectional switching device 140. do. Thereafter, the power semiconductor switch G2 on the right side is turned off.
- the high voltage DC circuit breaker 100 of the present invention is characterized in that the reclosing operation of the main switch 110 is possible. That is, when the B side fault is removed, the control unit may close the main switch 110 to form a close in the DC line 10. When closing the main switch 110 to form a closed, if the B-side failure is not removed to repeat the above process. This reclosing is possible because the capacitor 131 remains charged at + Vc in the LC circuit 130 after the arc is extinguished in the main switch 110.
- an arc generated in the main switch 110 is blocked by one LC resonance in the LC circuit 130 to block a fault current flowing through the arc.
- the control unit detects the failure to open the main switch 110.
- the main switch 110 is opened, an arc occurs between the switching terminals of the main switch 110 so that a fault current continuously flows from B ⁇ A.
- the power semiconductor switches G3 and G4 connected in parallel with each other of the second bidirectional switching element 150 are turned off and the power semiconductor switch G1 on the left side of the first bidirectional switching element 140 is turned on. ON)
- the current is supplied to the A side by the voltage stored in the capacitor 131 of the LC circuit 130.
- the current supplied to the A side is opposite in direction to the fault current sustained through the arc in the main switch 110 and is preferably larger.
- the high voltage DC circuit breaker 100 of the present invention may operate by reclosing the main switch 110. That is, when the A side fault is removed, the control unit may close the main switch 110 to form a close in the DC line 10. At this time, in the case of closing the main switch 110 to form a closed, if the A-side failure is not removed to repeat the above process. This reclosing is possible because the LC resonance is made in the LC circuit 130 after the arc is extinguished in the main switch 110, so that the capacitor 131 always maintains the charging state at + Vc.
- the high voltage DC circuit breaker 100 is a power semiconductor of the second bidirectional switching element 150, not the main switch (CB) as the current caused by the LC resonance shown in FIG. It is characterized in that it is made through the switches (G3, G4). Therefore, the current oscillation due to the LC resonance is not increased as in the prior art.
- the LC resonance is performed only once so that the voltage polarity of the capacitor 131 of the LC circuit 130 is reversed by the LC resonance. This causes the blocking speed to increase compared to the prior art.
- the current stored in the opposite direction to the fault current flowing in the main switch 110 is injected into the main switch 110 by the voltage stored in the capacitor 131 to make zero current so as to extinguish the arc. .
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- Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
Abstract
Description
Claims (10)
- 직류(DC) 선로에 흐르는 전류를 차단하기 위한 고전압 DC 차단기에 있어서,상기 DC 선로에 설치되고 상기 DC 선로의 일측 또는 타측에 고장발생시 개방되어 상기 DC 선로의 전류를 차단하기 위한 메인스위치(110);상기 메인스위치(110)에 병렬연결된 비선형 저항기(120);상기 메인스위치(110)에 병렬연결되고 LC 공진을 발생하기 위해 직렬연결된 커패시터(131) 및 리액터(132)를 포함하는 LC 회로(130);상기 LC 회로(130)에 직렬연결되어 양방향 전류흐름을 스위칭하는 제1 양방향 스위칭소자(140); 및상기 LC 회로(130)에 병렬연결되어 양방향으로 LC 공진이 이루어지도록 전류흐름을 스위칭하는 제2 양방향 스위칭소자(150); 를 포함하는 고전압 DC 차단기.
- 제1항에 있어서,초기 기동시 상기 커패시터(131)에 DC 전압(Vc)을 충전하기 위한 충전저항(160)을 더 포함하고, 상기 충전저항(160)은 상기 LC 회로(130) 및 상기 제1 양방향 스위칭소자(140) 간의 접점과 접지(GND) 사이에 설치되는 고전압 DC 차단기.
- 제1항 또는 제2항에 있어서,상기 제1 및 제2 양방향 스위칭소자는,각각 턴온 또는 턴온/턴오프 제어가능한 한 쌍의 전력 반도체 스위치(G1-G2,G3-G4)를 포함하고 상기 각 쌍의 전력 반도체 스위치는 서로 반대방향으로 병렬연결되는 고전압 DC 차단기.
- 제3항에 있어서,상기 DC 선로의 상기 일측에 고장발생으로 상기 메인스위치(110)가 개방되고 상기 메인스위치(110)의 개방시 아크(arc)가 발생하면,상기 제1 양방향 스위칭소자(140)의 전력 반도체 스위치(G1-G2)는 오프(OFF)된 상태에서 상기 제2 양방향 스위칭소자(150) 중 하나의 전력 반도체 스위치(G4)가 온(ON)되어 상기 LC 회로(130)의 리액터(132)와 커패시터(131) 간 LC 공진에 의해 상기 커패시터(131)에 -Vc 전압이 충전된 후 상기 전력 반도체 스위치(G4)가 오프(OFF)되고, 상기 제1 양방향 스위칭소자(140) 중 하나의 전력 반도체 스위치(G2)가 온되어 상기 커패시터(131)에 충전된 -Vc 전압에 의해 상기 메인스위치(110)로 전류를 공급하고, 상기 공급된 전류에 의해 상기 메인스위치(110)에서 0(zero) 전류가 되어 상기 메인스위치(110)에 발생된 아크가 소호되도록 하는 고전압 DC 차단기.
- 제4항에 있어서,상기 커패시터(131)에 의해 충전된 -Vc에 의해 상기 메인스위치(110)로 공급되는 전류는 상기 메인스위치(110)에서 아크를 통해 지속되는 고장전류와 방향은 반대이고 크기는 더 큰 고전압 DC 차단기.
- 제4항에 있어서,상기 메인스위치(110)에서 발생한 아크가 소호된 이후에,상기 DC선로의 일측보다 상대적으로 높아진 타측의 전압은 상기 비선형 저항기(120)에서 소모됨과 동시에 상기 LC 회로(130) 및 제1 양방향 스위칭소자(140)를 통해 흐르는 전류에 의해 상기 커패시터(131)는 +Vc로 재충전된 후 상기 전력 반도체 스위치(G2)가 오프(OFF)되는 고전압 DC 차단기.
- 제3항에 있어서,상기 DC 선로의 상기 타측에 고장발생으로 상기 메인스위치(110)가 개방되고 상기 메인스위치(110)의 개방시 아크(arc)가 발생하면,상기 제2 양방향 스위칭소자(150)의 전력 반도체 스위치(G3-G4)는 오프(OFF)된 상태에서 상기 제1 양방향 스위칭소자(140) 중 하나의 전력 반도체 스위치(G1)가 온(ON)되어 상기 LC 회로(130)의 커패시터(131)에 기충전된 +Vc 전압에 의해 상기 메인스위치(110)로 전류를 공급하고, 상기 공급된 전류에 의해 상기 메인스위치(110)에서 0(zero) 전류가 되어 상기 메인스위치(110)에 발생된 아크가 소호되도록 하는 고전압 DC 차단기.
- 제7항에 있어서,상기 커패시터(131)에 의해 기충전된 +Vc에 의해 상기 메인스위치(110)로 공급되는 전류는 상기 메인스위치(110)에서 아크를 통해 지속되는 고장전류와 방향은 반대이고 크기는 더 큰 고전압 DC 차단기.
- 제7항에 있어서,상기 메인스위치(110)에서 발생한 아크가 소호된 이후에,상기 DC 선로의 타측보다 상대적으로 높아진 일측의 전압에 의해 상기 LC 회로(130)의 커패시터(131)는 -Vc로 충전된 후 상기 전력 반도체 스위치(G1)이 오프(OFF)되고,이후에 상기 제2 양방향 스위칭소자(150) 중 하나의 전력 반도체 스위치(G3)가 온(ON)되어 상기 LC 회로(130)의 커패시터(131)와 리액터(132) 간 LC 공진에 의해 상기 커패시터(131)에 +Vc 전압이 재충전되도록 하는 고전압 DC 차단기.
- 제9항에 있어서,상기 DC 선로의 타측보다 상대적으로 높아진 일측에서의 전압은 상기 비선형 저항기(120)에서 소모되는 고전압 DC 차단기.
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
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US14/912,092 US10170903B2 (en) | 2013-08-14 | 2014-08-14 | High voltage DC circuit breaker |
EP14836732.9A EP3035471B1 (en) | 2013-08-14 | 2014-08-14 | High voltage dc breaker |
CN201480055456.6A CN105659459B (zh) | 2013-08-14 | 2014-08-14 | 高压直流断路器 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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KR1020130096253A KR101506581B1 (ko) | 2013-08-14 | 2013-08-14 | 고전압 dc 차단기 |
KR10-2013-0096253 | 2013-08-14 |
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WO2015023157A1 true WO2015023157A1 (ko) | 2015-02-19 |
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PCT/KR2014/007604 WO2015023157A1 (ko) | 2013-08-14 | 2014-08-14 | 고전압 dc 차단기 |
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US (1) | US10170903B2 (ko) |
EP (1) | EP3035471B1 (ko) |
KR (1) | KR101506581B1 (ko) |
CN (1) | CN105659459B (ko) |
WO (1) | WO2015023157A1 (ko) |
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KR101550374B1 (ko) * | 2013-12-31 | 2015-09-04 | 주식회사 효성 | 고전압 dc 차단기 |
CN204242871U (zh) * | 2014-03-07 | 2015-04-01 | 广州市金矢电子有限公司 | 电容耦合式灭弧电路及装置 |
WO2016042601A1 (ja) * | 2014-09-16 | 2016-03-24 | 三菱電機株式会社 | 風力発電システムおよび直流送電システム |
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Also Published As
Publication number | Publication date |
---|---|
EP3035471B1 (en) | 2018-04-25 |
CN105659459A (zh) | 2016-06-08 |
KR20150019416A (ko) | 2015-02-25 |
KR101506581B1 (ko) | 2015-03-27 |
US20160204595A1 (en) | 2016-07-14 |
US10170903B2 (en) | 2019-01-01 |
EP3035471A1 (en) | 2016-06-22 |
CN105659459B (zh) | 2019-06-14 |
EP3035471A4 (en) | 2017-03-29 |
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