CN107947132A - It is a kind of that there is micro- loss combined machine formula dc circuit breaker of reclosing - Google Patents
It is a kind of that there is micro- loss combined machine formula dc circuit breaker of reclosing Download PDFInfo
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- CN107947132A CN107947132A CN201711237507.9A CN201711237507A CN107947132A CN 107947132 A CN107947132 A CN 107947132A CN 201711237507 A CN201711237507 A CN 201711237507A CN 107947132 A CN107947132 A CN 107947132A
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- branch
- circuit breaker
- voltage
- voltage arm
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/268—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured for DC systems
-
- 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
- H02H3/06—Details with automatic reconnection
- H02H3/066—Reconnection being a consequence of eliminating the fault which caused disconnection
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- Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
Abstract
本发明涉及一种具有重合闸功能的微损耗组合机械式直流断路器，包括n个接线端、n条通流支路、1条换流支路；其中n条通流支路与1条换流支路并联，每条通流支路以连接点为界，分为上桥臂和下桥臂；每个接线端与一条通流支路的连接点电气连接；每条通流支路的上桥臂包括1个辅助机械开关，下桥臂包括相互串联的1个隔离开关和1个半导体开关组件；所述换流支路包括相互串联的1个主机械开关、1个高压臂电容和1个低压臂电容串联；所述高压臂电容与高压电阻和避雷器并联，高压臂电容不需预充电；所述低压臂电容预充一定电压，低压臂电容的低压端直接与高压臂电容电气连接。
The invention relates to a micro-loss combined mechanical DC circuit breaker with the function of reclosing, which includes n terminals, n flow branches, and 1 commutation branch; The flow branches are connected in parallel, and each flow branch is bounded by the connection point, which is divided into an upper bridge arm and a lower bridge arm; each terminal is electrically connected to a connection point of a flow branch; each flow branch The upper bridge arm includes an auxiliary mechanical switch, and the lower bridge arm includes an isolating switch and a semiconductor switch assembly connected in series; the commutation branch includes a main mechanical switch connected in series, a high-voltage arm capacitor and One low-voltage arm capacitor is connected in series; the high-voltage arm capacitor is connected in parallel with the high-voltage resistor and lightning arrester, and the high-voltage arm capacitor does not need to be precharged; the low-voltage arm capacitor is pre-charged with a certain voltage, and the low-voltage end of the low-voltage arm capacitor is directly electrically connected to the high-voltage arm capacitor .
Description
Technical field
The present invention relates to electrical equipment technical field, more particularly to a kind of there is micro- loss combined machine of reclosing
Formula dc circuit breaker.
Background technology
There is an urgent need for dc circuit breaker in DC grid can quickly isolate DC side failure, so as to ensure normal current conversion station and line
The reliably working on road.
At present, the mainstream technology route of dc circuit breaker is divided into hybrid dc circuit breaker and mechanical dc circuit breaker,
Wherein mechanical dc circuit breaker has the advantages that cost is low low with running wastage, but but presence can not realize high-speed reclosure
The shortcomings that.Typical mechanical direct-current breaker topology structure as depicted in figs. 1 and 2, wherein mechanical dc circuit breaker includes
Through-flow branch, change of current branch and energy-absorbing branch.Normal duty electric current is turned on by through-flow branch, and breaker is operated in low-loss shape
State；Once detecting failure, short circuit current flow need to be transferred to change of current branch by through-flow branch, so as to establish electricity at breaker both ends
Pressure, and then lightning arrestor movement, short circuit current flow are further transferred to arrester, and short circuit current flow is gradually reduced, so as to fulfill electricity
Stream is cut-off.
Mechanical dc circuit breaker shown in Fig. 1 is active oscillating type dc circuit breaker, its change of current principle is to give change of current branch
In high-voltage capacitance precharge, then by controlling the pressure-air ball gap in change of current branch to turn on, make short circuit current flow by through-flow
Branch is transferred to change of current branch.Maximum voltage value on Fig. 1 mesohigh capacitances is about 1.5 times of system voltage, and the voltage is very high,
If high-voltage capacitance uses independent charging system, the volume and cost of charge independence system are excessive, thus generally employ at present
Online way to take power.For online electricity getting system, if dc bus decompression, the magnitude of voltage in breaker high-voltage capacitance do not know into
And cause the reduction of breaker reliability；In addition to realize that bidirectional current is cut-off, the pressure-air ball gap arc-rupturing capacity in Fig. 1
It is weaker, the arc time is long, the service life is shorter, its arc-rupturing capacity audient's multifactor impact, thus there are uncontrollability for its working status
And uncertainty.
In order to avoid high-voltage capacitance takes problem caused by electricity and pressure-air ball gap online, Fig. 2 employs one kind and is based on
The commutation mode of transformer coupled principle.With the rise of dc circuit breaker rated voltage and specified drop-out current, primary side in Fig. 2
The pressure-resistant current levels of voltage and primary side fast conducting switch on capacitance are continuously improved；In addition this mechanical dc circuit breaker
It can not realize high-speed reclosure.
Tradition machinery formula dc circuit breaker shown in Fig. 1 and Fig. 2 is only capable of cut-offfing the failure electricity on an inlet wire and 1 outlet
Stream, if using tradition machinery formula dc circuit breaker in the dc circuit breaker platform installed on DC grid, every dc bus
Number is identical with dc bus external connection way.In other words, need the dc circuit breaker number of units of configuration huge in DC grid, and direct current
Breaker involves great expense, and in turn results in being significantly increased for DC grid construction cost.
The content of the invention
The present invention is in order to overcome deficiency of the prior art, for required dc circuit breaker number of units mistake in DC grid
It is more, dc circuit breaker cost is excessive, and overhead line type DC grid dc circuit breaker is proposed high-speed reclosure requirement, carry
There is micro- loss combined machine formula dc circuit breaker of reclosing and its control method for a kind of, can be according to dc bus
On inlet-outlet line quantity variance design the combined machine formula dc circuit breaker, ensure every dc bus need to only configure one it is straight
Breaker is flowed, so as to fulfill the protection of all external circuits of dc bus, significantly reduces dc circuit breaker in DC grid
Cost.Combined machine formula dc circuit breaker in the present invention turns on normal duty electric current by mechanical switch, operates in micro- loss shape
State；It can realize reclosing function in the case where not causing current over pulse, be established for the popularization of overhead line type DC grid
Technical foundation.
The present invention is achieved by the following technical solutions：
It is a kind of that there is micro- loss combined machine formula dc circuit breaker of reclosing, it is characterised in that including n wiring
End, n bars are through-flow branch, 1 change of current branch；The wherein through-flow branch of n bars and 1 change of current branch circuit parallel connection, every through-flow branch is with even
Contact is boundary, is divided into bridge arm and lower bridge arm；The tie point of each terminals and a through-flow branch is electrically connected；Every through-flow
The upper bridge arm of branch includes 1 auxiliary mechanical switch, and lower bridge arm includes 1 disconnecting switch being serially connected and 1 semiconductor is opened
Close component；The change of current branch includes 1 main mechanical switch, 1 high voltage arm capacitor and the 1 low-voltage arm capacitance string being serially connected
Connection；The high voltage arm capacitor is in parallel with high-tension resistive and arrester, and high voltage arm capacitor is not required to be pre-charged；The low-voltage arm capacitance is pre-
Certain voltage is filled, the low-pressure end of low-voltage arm capacitance is directly electrically connected with high voltage arm capacitor；The low-voltage arm capacitance and diode
Parallel connection, the low-pressure end of low-voltage arm capacitance and the anode electrical of diode connect, the high-pressure side of low-voltage arm capacitance and the moon of diode
Pole is electrically connected.
Preferably, it is characterised in that the disconnecting switch is driven by quick operating mechanism.The auxiliary mechanical switch is by fast
Fast operating mechanism driving, the energy of its operating mechanism storage can ensure that auxiliary mechanical switch is cut-off and reclosing mistake in fault current
Separating brake-closing operation is carried out continuously in journey.The main mechanical switch is driven by quick operating mechanism, the energy of its operating mechanism storage
Amount can ensure that main mechanical switch cut-offs in fault current and separating brake-combined floodgate-sub-switching operation is carried out continuously during reclosing.
Compared with prior art, beneficial effect caused by technical scheme is：
Dc circuit breaker, in micro- loss state, is nearly free from operating cost in normal operation in the present invention；This hair
A dc circuit breaker in bright can realize the cut-offfing with isolating of all external circuit fault currents on a busbar, and then reduce
The construction cost of dc circuit breaker in DC grid；Dc circuit breaker in the present invention can not cause the premise of current over pulse
Under realize high-speed reclosure, provide strong technical support for the development of overhead line type DC grid.
Brief description of the drawings
Fig. 1 shows the structure diagram of the mechanical dc circuit breaker of active oscillation mode；
Fig. 2 shows the structure diagram of the mechanical dc circuit breaker based on change of current drive circuit；
Fig. 3 shows that the present invention has the function of a specific implementation of micro- loss combined machine formula dc circuit breaker of reclosing
The structure diagram of example.
Embodiment
The present invention is described more fully with reference to the accompanying drawings, wherein illustrating the exemplary embodiment of the present invention.
Fig. 3 shows a kind of knot with micro- loss combined machine formula dc circuit breaker of reclosing provided by the invention
Structure schematic diagram.As shown in figure 3, micro- loss combined machine formula dc circuit breaker 300 with reclosing includes：N wiring
Hold (Node_1, Node_2, Node_n), n bars are through-flow branch (through-flow branch 1, through-flow branch 2, through-flow branch n), 1 change of current branch
Road；Wherein through-flow branch 1, through-flow branch 2, through-flow branch n and change of current branch circuit parallel connection；Every through-flow branch is with tie point
(Midpoint_1, Midpoint_2, Midpoint) is n) boundary, can be divided into bridge arm and lower bridge arm；Each terminals (Node_
1, Node_2, Node_n) respectively by the tie point (Midpoint_1, Midpoint_2, Midpoint) of a through-flow branch
Electrical connection.
A kind of one with micro- loss combined machine formula dc circuit breaker of reclosing provided by the invention is specific
In embodiment, (through-flow branch 1, through-flow branch 2, the upper bridge arm of through-flow branch n) are by auxiliary mechanical switch (CB_ for each through-flow branch
1, CB_2, CB_n) form.
A kind of one with micro- loss combined machine formula dc circuit breaker of reclosing provided by the invention is specific
In embodiment, each auxiliary mechanical switch (CB_1, CB_2, CB_n) is driven by quick operating mechanism, the energy of its operating mechanism storage
Amount can ensure that auxiliary mechanical switch cut-offs in fault current and separating brake-closing operation is carried out continuously during reclosing, its separating brake
Speed is several milliseconds.
A kind of one with micro- loss combined machine formula dc circuit breaker of reclosing provided by the invention is specific
In embodiment, (through-flow branch 1, through-flow branch 2, the lower bridge arm of through-flow branch n) are respectively by 1 disconnecting switch for each through-flow branch
(K_1, K_2, K_n) and 1 semiconductor switching component (T_1, T_2, T_n) are in series.
A kind of one with micro- loss combined machine formula dc circuit breaker of reclosing provided by the invention is specific
In embodiment, each disconnecting switch (K_1, K_2, K_n) is driven by quick operating mechanism, its opening time is several milliseconds.
A kind of one with micro- loss combined machine formula dc circuit breaker of reclosing provided by the invention is specific
In embodiment, the ON time of each semiconductor switching component (T_1, T_2, T_n) is Microsecond grade, such as can use thyristor and two
Pole pipe inverse parallel.
A kind of one with micro- loss combined machine formula dc circuit breaker of reclosing provided by the invention is specific
In embodiment, change of current branch route a main mechanical switch, 1 high voltage arm capacitor C1 and 1 low-voltage arm capacitance C2 and is in series.It is main
Mechanical switch (Main_CB) is driven by quick operating mechanism, and the energy of its operating mechanism storage can ensure main mechanical switch in event
Barrier electric current cut-offs and separating brake-combined floodgate-sub-switching operation is carried out continuously during reclosing, its opening velocity is several milliseconds.High-voltage arm
Capacitance C1 is in parallel with high-tension resistive R and arrester MOV, and high voltage arm capacitor C1 is not required to be pre-charged.Low-voltage arm capacitance C2 preliminary fillings are certain
Voltage, the low-pressure end of low-voltage arm capacitance C2 are directly electrically connected with high voltage arm capacitor C2.Low-voltage arm capacitance C2 and diode D is simultaneously
Connection, the low-pressure end of low-voltage arm capacitance C1 are connected with the anode electrical of diode D, high-pressure side and the diode D of low-voltage arm capacitance C1
Cathode electrical connection.
Specifically, the control method of the present invention, when turning on normal duty electric current, each terminals (Node_1, Node_2,
Node_n) auxiliary mechanical switch (CB_1, CB_2, CB_n) of bridge arm is in "on" position on the through-flow branch of connection；Each lower bridge
The disconnecting switch (K_1, K_2, K_n) of arm is in "on" position；Semiconductor switching component (T_1, the T_ of each through-flow branch lower bridge arm
2, T_n) it is off state；The main mechanical switch (Main_CB) of change of current branch is in "on" position；Normal duty electric current is by a
Auxiliary mechanical switch (CB_1, CB_2, CB_n) of the terminals (Node_1, Node_2, Node_n) through bridge arm on each through-flow branch
Flow in or out, dc circuit breaker operates in micro- loss state.
Realize when cut-offfing of fault current, detect some terminals external fault, by taking Node_1 external faults as an example, give
The auxiliary mechanical switch CB_1 hair separating brake orders of bridge arm on the through-flow branch 1 of Node_1 connections, while perfected terminals
The through-flow branch 2 of (Node_2, Node_n) connection and disconnecting switch (K_2, K_n) the hair separating brake order of through-flow branch n lower bridge arms,
Auxiliary mechanical switch CB_1 starts arcing, and disconnecting switch K_2 and K_n not arcing；Wait auxiliary mechanical switch CB_1, keep apart
Pass K_2 and K_n, which reaches, necessarily to be opened away from rear, the semiconductor switch to 1 lower bridge arm of through-flow branch of mistake wiring end Node_1 connections
Component T_1 sends out ON command, and separating brake order, change of current branch low-voltage arm capacitance C2 are sent out to change of current branch main mechanical switch Main_CB
On negative voltage driving electric current by bridge arm on through-flow branch 1 be transferred to change of current branch and 1 lower bridge arm of through-flow branch series connection branch
In；Main_CB arcings at the same time；Fault current constantly makes its both end voltage liter to the high voltage arm capacitor C1 chargings in change of current branch
Height, then arrester MOV act, fault current is transferred to arrester MOV by high voltage arm capacitor C1, and fault current is gradually reduced；
After arrester MOV has absorbed system capacity, electric current is transferred back to high voltage arm capacitor C1 again, forms the aftercurrent of vibration,
Finally aftercurrent is cut-off in the zero crossing of aftercurrent and realize cut-offfing for fault current by main mechanical switch Main_CB；
When realizing high-speed reclosure, in two kinds of situation.For permanent fault, fault current waits certain failure after cut-offfing
Go to travel the time, the main mechanical switch Main_CB in combined floodgate change of current branch and the Node_1 connections of conducting failure terminals it is through-flow
The semiconductor switching component T_1 of 1 lower bridge arm of branch, after detecting oscillating current again, needs the host of separating brake change of current branch again
Tool switchs Main_CB, and cut-offfing for oscillating current is realized by main mechanical switch Main_CB；Close a floodgate at the same time and perfect terminals connection
Through-flow branch 2 and through-flow branch n lower bridge arms disconnecting switch T_2 and T_n.It may be noted that according to by rationally designing C1, weight can control
It is less than rated current together in oscillating current caused by permanent fault, and makes converter valve in DC grid and equipment from two
Primary current impacts.
For provisional failure, fault current waits certain failure to go to travel the time after cut-offfing, the master of combined floodgate change of current branch
The semiconductor switching component T_ of mechanical switch Main_CB and 1 lower bridge arm of through-flow branch of conducting failure terminals Node_1 connections
1, it is not detected by oscillating current, the auxiliary mechanical switch CB_ of bridge arm on the through-flow branch of Closing fault terminals Node_1 connections
1, and the close a floodgate through-flow branch 2 for perfecting terminals connection and through-flow branch n lower bridge arms disconnecting switch T_2 and T_n.
With reference to the exemplary description of the foregoing present invention, those skilled in the art can should clearly know that the present invention has
Advantages below：
1. the present invention, which carries, to design combined DC breaker according to the external circuit quantity varianceization of dc bus
Terminals quantity, ensures that 1 dc bus only need to be according to 1 dc circuit breaker, so as to significantly reduce direct current in DC grid
Quantity, volume and the cost of breaker.
In normal operation, 2. normal duty electric current is turned on the present invention by mechanical switch, and dc circuit breaker operates in micro- damage
Consumption state, is nearly free from operating cost.
It is overhead line type DC grid 3. the present invention can realize reclosing function in the case where not causing rush of current
Development provide strong technical support.
Claims (4)
1. a kind of have the function of micro- loss combined machine formula dc circuit breaker of reclosing, it is characterised in that including n wiring
End, n bars are through-flow branch, 1 change of current branch；The wherein through-flow branch of n bars and 1 change of current branch circuit parallel connection, every through-flow branch is with even
Contact is boundary, is divided into bridge arm and lower bridge arm.The tie point of each terminals and a through-flow branch is electrically connected；Every through-flow
The upper bridge arm of branch includes 1 auxiliary mechanical switch, and lower bridge arm includes 1 disconnecting switch being serially connected and 1 semiconductor is opened
Close component；The change of current branch includes 1 main mechanical switch, 1 high voltage arm capacitor and the 1 low-voltage arm capacitance string being serially connected
Connection；The high voltage arm capacitor is in parallel with high-tension resistive and arrester, and high voltage arm capacitor is not required to be pre-charged；The low-voltage arm capacitance is pre-
Certain voltage is filled, the low-pressure end of low-voltage arm capacitance is directly electrically connected with high voltage arm capacitor；The low-voltage arm capacitance and diode
Parallel connection, the low-pressure end of low-voltage arm capacitance and the anode electrical of diode connect, the high-pressure side of low-voltage arm capacitance and the moon of diode
Pole is electrically connected.
2. combined machine formula dc circuit breaker according to claim 1, it is characterised in that the disconnecting switch is by quickly grasping
Motivation structure drives.
3. combined machine formula dc circuit breaker according to claim 1, it is characterised in that the auxiliary mechanical switch is by fast
Fast operating mechanism driving, the energy of its operating mechanism storage can ensure that auxiliary mechanical switch is cut-off and reclosing mistake in fault current
Separating brake-closing operation is carried out continuously in journey.
4. combined machine formula dc circuit breaker according to claim 1, it is characterised in that the main mechanical switch is by quick
Operating mechanism drive, its operating mechanism storage energy can ensure main mechanical switch fault current cut-off with during reclosing
It is carried out continuously separating brake-combined floodgate-sub-switching operation.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711237507.9A CN107947132B (en) | 2017-11-30 | 2017-11-30 | A kind of micro- loss combined machine formula dc circuit breaker with reclosing function |
| PCT/CN2017/118163 WO2019104793A1 (en) | 2017-11-30 | 2017-12-25 | Micro-loss combined mechanical direct current circuit breaker and control method therefor |
| US16/573,750 US11038338B2 (en) | 2017-11-30 | 2019-09-17 | Micro-loss combined mechanical DC circuit breaker and its control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711237507.9A CN107947132B (en) | 2017-11-30 | 2017-11-30 | A kind of micro- loss combined machine formula dc circuit breaker with reclosing function |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107947132A true CN107947132A (en) | 2018-04-20 |
| CN107947132B CN107947132B (en) | 2019-03-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711237507.9A Expired - Fee Related CN107947132B (en) | 2017-11-30 | 2017-11-30 | A kind of micro- loss combined machine formula dc circuit breaker with reclosing function |
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| Country | Link |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019104793A1 (en) * | 2017-11-30 | 2019-06-06 | 天津大学 | Micro-loss combined mechanical direct current circuit breaker and control method therefor |
| CN111900703A (en) * | 2020-06-18 | 2020-11-06 | 平高集团有限公司 | A hybrid DC circuit breaker |
| CN113824083A (en) * | 2021-07-09 | 2021-12-21 | 天津大学 | A hybrid DC circuit breaker with adaptive reclosing |
| CN114362093A (en) * | 2022-03-16 | 2022-04-15 | 清华大学 | A large-capacity AC circuit breaker based on capacitive commutation and its control method |
| CN114709800A (en) * | 2022-04-28 | 2022-07-05 | 西安交通大学 | Compact direct-current circuit breaker sharing branch circuit and control method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US11038338B2 (en) | 2017-11-30 | 2021-06-15 | Tianjin University | Micro-loss combined mechanical DC circuit breaker and its control method |
| CN111900703A (en) * | 2020-06-18 | 2020-11-06 | 平高集团有限公司 | A hybrid DC circuit breaker |
| CN113824083A (en) * | 2021-07-09 | 2021-12-21 | 天津大学 | A hybrid DC circuit breaker with adaptive reclosing |
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| CN114709800A (en) * | 2022-04-28 | 2022-07-05 | 西安交通大学 | Compact direct-current circuit breaker sharing branch circuit and control method thereof |
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| Publication number | Publication date |
|---|---|
| CN107947132B (en) | 2019-03-19 |
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