CN107749615B - It is a kind of based on the dc circuit breaker for sealing in capacitor and its DC Line Fault processing strategie - Google Patents
It is a kind of based on the dc circuit breaker for sealing in capacitor and its DC Line Fault processing strategie Download PDFInfo
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- CN107749615B CN107749615B CN201710909434.7A CN201710909434A CN107749615B CN 107749615 B CN107749615 B CN 107749615B CN 201710909434 A CN201710909434 A CN 201710909434A CN 107749615 B CN107749615 B CN 107749615B
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- circuit breaker
- branch
- capacitor
- switch
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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
Abstract
The invention discloses a kind of based on the dc circuit breaker for sealing in capacitor and its DC Line Fault processing strategie, including normal through-flow branch, main transfer branch, cutout branch, reactor and disconnecting switch, normal through-flow branch routes supper-fast mechanical switch and load-transfer switch is composed in series, main transfer branch routing main circuit breaker is constituted, cutout branch routing thyristor controlled series compensation and centralized capacitor are composed in series, load-transfer switch is made of in series and parallel multiple submodules with two-way through-current capability, and main circuit breaker can be made of in series and parallel multiple simple type half-bridge submodules.Breaker of the present invention changes fault current property using capacitor, and then fault current is blocked, and used IGBT negligible amounts, can substantially reduce project cost and running wastage, has very strong reference significance and use value in engineering.
Description
Technical field
The invention belongs to power electronic system technical fields, and in particular to a kind of based on the dc circuit breaker for sealing in capacitor
And its DC Line Fault processing strategie.
Background technique
There are two types of basic network forming modes for DC grid: the first network forming mode uses the modularization based on half-bridge submodule
Multilevel converter (MMC) plus dc circuit breaker scheme, this network forming mode are suitable for holding any more DC grid of number；Second
Kind network forming mode uses the MMC with DC Line Fault self-cleaning ability, for example, by using the MMC based on full-bridge submodule, but is not necessarily to
Dc circuit breaker, this network forming mode are suitable for holding small-scale DC grid of the number less than 10.Added directly using half-bridge submodule MMC
When flowing the network forming mode of breaker, usually requires that converter station continues to run during DC line fault, cannot be latched, faulty line
It is quickly cut off by dc circuit breaker, troubleshooting principle is similar with AC network.Using the network forming mode of no dc circuit breaker
When, net during DC line fault in related converter blocking, 10ms or so fault current to zero and is stable at zero after locking,
Again by disconnecting switch isolated fault route, then related converter deblocking restores power transmission again, send since failure to recovery
Electricity time generally in 20ms or so, usually to the impact of AC network within the scope of can bear.
When adding the network forming mode of dc circuit breaker using half-bridge submodule MMC, dc circuit breaker just becomes DC grid
Key element.High voltage DC breaker structural scheme focuses primarily upon 3 seed types at present, is based on ordinary tap respectively
Tradition machinery type breaker, the solid circuit breaker based on pure power electronic devices and the hybrid circuit-breaker combined based on the two.
Although having developed technically feasible high voltage DC breaker at present, its is with high costs, bulky, it is difficult to disconnected as exchanging
Road device is widely used in power grid like that.Therefore, dc circuit breaker is still the essence technical bottleneck for developing DC grid.
Summary of the invention
In view of above-mentioned, plan is handled based on the dc circuit breaker for sealing in capacitor and its DC Line Fault the present invention provides a kind of
Slightly, which changes fault current property using capacitor, and then fault current is blocked, and used IGBT quantity
It is less, project cost and running wastage can be substantially reduced, there is very strong reference significance and use value in engineering.
It is a kind of based on the dc circuit breaker for sealing in capacitor, including normal through-flow branch, main transfer branch, the branch that stops,
One end and disconnecting switch after reactor and disconnecting switch, normal through-flow branch and main transfer branch and the branch circuit parallel connection that stops
One end is connected, and the other end is connected with DC power transmission line, and the other end of disconnecting switch is connected with one end of reactor, reactor
The other end is connected with converter station；The normal through-flow branch routes supper-fast mechanical switch and load-transfer switch is composed in series, institute
It states main transfer branch routing main circuit breaker to constitute, the cutout branch routing thyristor controlled series compensation and centralized capacitor are composed in series, institute
It states main circuit breaker and is made of in series and parallel multiple submodule, the load-transfer switch is by multiple submodules with two-way through-current capability
Block forms in series and parallel, and the thyristor controlled series compensation is made of in series and parallel multiple thyristors.
Further, the submodule of the main circuit breaker uses full-bridge sub-modular structure, enhanced half-bridge sub-modular structure
Or simple type half-bridge sub-modular structure.
Further, the submodule of the load-transfer switch uses full-bridge sub-modular structure or enhanced half-bridge submodule
Structure.
Further, the enhanced half-bridge sub-modular structure include two IGBT pipe T1 with anti-paralleled diode~
T2, two diode D1~D2 and a capacitor C1；Wherein, the emitter of IGBT pipe T1 is connected simultaneously with the cathode of diode D1
As one end of submodule, the collector of IGBT pipe T1 is connected with one end of the collector of IGBT pipe T2 and capacitor C1, IGBT
The emitter of pipe T2 is connected with the cathode of diode D2 and the other end as submodule, the anode and diode D2 of diode D1
Anode and capacitor C1 the other end be connected, the base stage of IGBT pipe T1~T2 connect external control circuit offer switch control
Signal.
Further, the simple type half-bridge sub-modular structure includes a capacitor C2, an IGBT pipe T3 and one
Diode D3；Wherein, the collector of IGBT pipe T3 is connected and one end as submodule with one end of capacitor C2, and capacitor C2's is another
One end is connected with the anode of diode D3, and the cathode of diode D3 is connected and with the emitter of IGBT pipe T3 as the another of submodule
One end, the base stage of IGBT pipe T3 connect the switch control signal of external control circuit offer.
The DC Line Fault processing strategie of the dc circuit breaker, includes the following steps:
(1) when operating normally, it is closed disconnecting switch and supper-fast mechanical switch, all submodules in load-transfer switch
All submodules are in an off state in opening state, main circuit breaker, and all thyristors are off in thyristor controlled series compensation
State, then DC current is flowed through from normal through-flow branch；
(2) DC power transmission line occurs under ground fault condition, after detecting fault current, in load-transfer switch
All submodules apply cut-off signals, while applying open signal to submodules all in main circuit breaker；
(3) pass through a bit of delay, disconnect supper-fast mechanical switch；Off state is completely in supper-fast mechanical switch
Afterwards, opening state is set by thyristors all in thyristor controlled series compensation；
(4) again through a bit of delay, off state is set by submodules all in main circuit breaker, blocks fault current logical
Road.
Compared with prior art, the present invention has following advantageous effects:
1. when steady-state operation, DC current flows through normal through-flow branch, due to load-transfer switch submodule of the invention
Quantity is seldom, therefore steady-state operation loss is low.
2. since main circuit breaker submodule of the invention can use simple type half-bridge submodule, device count used
Amount can greatly reduce, and the cost of investment of breaker is greatly lowered.
3. due to present invention employs centralized capacitor, what the submodule capacitance in main circuit breaker can be chosen
Very little, This further reduces the costs of investment of breaker.
Detailed description of the invention
Fig. 1 is the topological structure schematic diagram of dc circuit breaker of the present invention.
Fig. 2 (a) is the topological structure schematic diagram of full-bridge submodule.
Fig. 2 (b) is the topological structure schematic diagram of enhanced half-bridge submodule.
Fig. 2 (c) is the topological structure schematic diagram of simple type half-bridge submodule.
Fig. 3 is the simulation waveform schematic diagram of dc circuit breaker of the present invention.
Specific embodiment
In order to more specifically describe the present invention, with reference to the accompanying drawing and specific embodiment is to technical solution of the present invention
It is described in detail.
As shown in Figure 1, including normal through-flow branch, main transfer branch the present invention is based on the dc circuit breaker for sealing in capacitor
Road, cutout branch, reactor and disconnecting switch, in which: normal through-flow branch, main transfer branch are in parallel with cutout branch three
Connection, one end after being connected in parallel are connected with DC line, and the other end is connected with one end of disconnecting switch；Disconnecting switch it is another
End is connected with one end of reactor；The other end of reactor is connected with converter station.
Normal through-flow branch includes supper-fast mechanical switch and load-transfer switch, wherein supper-fast mechanical switch and load
Transfer switch is cascaded；Main transfer branch includes main circuit breaker, and cutout branch includes thyristor controlled series compensation and centralized capacitor
Device series connection, thyristor controlled series compensation are made of in series and parallel multiple thyristors.Load-transfer switch is by the series-parallel structure of several submodules SM1
At main circuit breaker is made of in series and parallel many submodule SM2.Submodule SM1 has two-way through-current capability, and structure has very much
Kind, including full-bridge sub-modular structure, enhanced half-bridge sub-modular structure etc.；There are many kinds of the structures of submodule SM2, including full-bridge
Sub-modular structure, enhanced half-bridge sub-modular structure and simple type half-bridge sub-modular structure etc..
Normal through-flow branch and main transfer branch are consistent with the function of mixed type dc circuit breaker in the present invention, and stop branch
It is in series by thyristor valve and centralized capacitor；DC current is flowed through from normal through-flow branch when normal operation, is stopped
Without flow through electric current in branch.The submodule of load-transfer switch is needed using the submodule with two-way through-current capability, and main disconnected
Submodule in the device of road can have many types, full-bridge submodule that Fig. 2 (a)~Fig. 2 (c) is respectively shown in, enhanced half-bridge
Module and simple type half-bridge submodule are three kinds of feasible schemes.It should be noted that stopping branch when due to steady-state operation not
Electric current is flowed through, and the current polarity for occurring to flow through main circuit breaker when DC Line Fault is single, so the submodule in main circuit breaker
Block can use relatively inexpensive simple type half-bridge submodule.
Simple type half-bridge submodule is divided on state and off state: when IGBT is opened, electric current is flowed through from IGBT, electricity
Appearance is bypassed, and is denoted as on state；When IGBT shutdown, electric current is flowed through from capacitive branch, is denoted as off state.
The DC Line Fault processing strategie of dc circuit breaker of the present invention includes:
(1) before failure occurs, disconnecting switch closure, supper-fast mechanical switch closure, all submodules of load-transfer switch
In the conductive state, all submodules of main circuit breaker are in an off state, and all thyristors of thyristor controlled series compensation are in an off state,
DC current is flowed through from normal circulation branch；
(2) after detecting DC Line Fault, all submodules of load-transfer switch are arranged to off state, simultaneously will
All submodules of main circuit breaker are arranged on state；
(3) pass through a bit of delay, open supper-fast mechanical switch；
(4) after supper-fast mechanical switch is completely in off state, conducting thyristor valve group；
(5) pass through a bit of delay, all submodules of main circuit breaker are arranged to off state, block fault current logical
Road.
Simulating, verifying is carried out using the test macro of single-ended 400kV, 400MW below, dc circuit breaker is using as shown in Figure 1
Breaker, wherein load-transfer switch uses enhanced half-bridge submodule, and main circuit breaker uses simple type half-bridge submodule, main
Breaker equivalent capacitance value is 10 μ F, and centralized capacitance is 100 μ F.
If (t=0ms) test macro has entered steady-state operation when emulation starts, when t=10ms, exports in smoothing reactor
Monopole ground short circuit occurs for place, and load-transfer switch adds shutdown to instruct when t=13ms, when t=13.1ms high speed machine switch plus
Open command, high speed machine switch fully opens when t=15ms, while triggering the thyristor valve in cutout branch, t=15.1ms
When main transfer branch add shutdown to instruct.Fig. 3 give normal through-flow branch current, main transfer branch current, the branch current that stops,
The main change curve for shifting branch voltage, thyristor valve voltage, centralized condenser voltage and MMC DC voltage.
From figure 3, it can be seen that electric current flows through main transfer branch simultaneously and breaks after applying shutdown instruction to main transfer branch
Flow branch.Since the centralized capacitance of cutout branch is far longer than main circuit breaker equivalent capacitance value, electric current is mainly from disconnected
Stream branch flows through.It can also be seen that can quickly separate DC current based on the dc circuit breaker for sealing in capacitor from Fig. 3,
And the overvoltage in fault treating procedure controls within 600kV, illustrates that breaker has good cutout characteristic.
The above-mentioned description to embodiment is for that can understand and apply the invention convenient for those skilled in the art.
Person skilled in the art obviously easily can make various modifications to above-described embodiment, and described herein general
Principle is applied in other embodiments without having to go through creative labor.Therefore, the present invention is not limited to the above embodiments, ability
Field technique personnel announcement according to the present invention, the improvement made for the present invention and modification all should be in protection scope of the present invention
Within.
Claims (2)
1. a kind of based on the dc circuit breaker for sealing in capacitor, it is characterised in that: including normal through-flow branch, main transfer branch,
Stop branch, reactor and disconnecting switch, after normal through-flow branch and main transfer branch and cutout branch circuit parallel connection one end and
One end of disconnecting switch is connected, and the other end is connected with DC power transmission line, one end phase of the other end and reactor of disconnecting switch
Even, the other end of reactor is connected with converter station；The normal through-flow branch routes supper-fast mechanical switch and load-transfer switch
It is composed in series, the main transfer branch routing main circuit breaker is constituted, the cutout branch routing thyristor controlled series compensation and centralized capacitor
It is composed in series, the main circuit breaker is made of in series and parallel multiple submodule, and the load-transfer switch has two-way by multiple
The submodule of stream ability forms in series and parallel, and the thyristor controlled series compensation is made of in series and parallel multiple thyristors；
The submodule of the main circuit breaker is using full-bridge sub-modular structure, enhanced half-bridge sub-modular structure or simple type half-bridge
Modular structure；The submodule of the load-transfer switch uses full-bridge sub-modular structure or enhanced half-bridge sub-modular structure；
The enhanced half-bridge sub-modular structure includes two IGBT pipe T1~T2 with anti-paralleled diode, two diode D1
~D2 and capacitor C1；Wherein, the emitter of IGBT pipe T1 is connected and one as submodule with the cathode of diode D1
End, the collector of IGBT pipe T1 is connected with one end of the collector of IGBT pipe T2 and capacitor C1, the emitter of IGBT pipe T2 and
The cathode of diode D2 is connected and the other end as submodule, the anode of diode D1 and the anode and capacitor of diode D2
The other end of C1 is connected, and the base stage of IGBT pipe T1~T2 connects the switch control signal of external control circuit offer；
The simple type half-bridge sub-modular structure includes a capacitor C2, an IGBT pipe T3 and a diode D3；Wherein,
The collector of IGBT pipe T3 is connected with one end of capacitor C2 and one end as submodule, the other end and diode D3 of capacitor C2
Anode be connected, the cathode of diode D3 is connected with the emitter of IGBT pipe T3 and the other end as submodule, IGBT pipe T3
Base stage connect external control circuit offer switch control signal.
2. the DC Line Fault processing strategie of dc circuit breaker as described in claim 1, includes the following steps:
(1) when operating normally, it is closed disconnecting switch and supper-fast mechanical switch, all submodules are in load-transfer switch
Opening state, all submodules are in an off state in main circuit breaker, and all thyristors are in an off state in thyristor controlled series compensation,
Then DC current is flowed through from normal through-flow branch；
(2) DC power transmission line occurs under ground fault condition, after detecting fault current, owns in load-transfer switch
Submodule applies cut-off signals, while applying open signal to submodules all in main circuit breaker；
(3) pass through a bit of delay, disconnect supper-fast mechanical switch；After supper-fast mechanical switch is completely in off state,
Opening state is set by thyristors all in thyristor controlled series compensation；
(4) again through a bit of delay, off state is set by submodules all in main circuit breaker, blocks fault current path.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710909434.7A CN107749615B (en) | 2017-09-29 | 2017-09-29 | It is a kind of based on the dc circuit breaker for sealing in capacitor and its DC Line Fault processing strategie |
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|---|---|---|---|
| CN201710909434.7A CN107749615B (en) | 2017-09-29 | 2017-09-29 | It is a kind of based on the dc circuit breaker for sealing in capacitor and its DC Line Fault processing strategie |
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| CN107749615B true CN107749615B (en) | 2019-01-04 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109066606A (en) * | 2018-07-12 | 2018-12-21 | 武汉杭久电气有限公司 | A kind of two-way forced commutation type direct current current-limiting circuit breaker |
| CN109768528A (en) * | 2019-01-24 | 2019-05-17 | 浙江大学 | A kind of mechanical switch dc circuit breaker and its troubleshooting strategy based on series capacitor |
| CN112803758B (en) * | 2021-01-15 | 2021-12-28 | 西安交通大学 | Non-isolated high-voltage direct current-direct current converter with fault blocking function and method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104767170A (en) * | 2014-01-06 | 2015-07-08 | 国家电网公司 | Mixed high-voltage direct-current circuit breaker and realization method thereof |
| CN105896488A (en) * | 2016-04-29 | 2016-08-24 | 浙江大学 | Short circuit fault processing method for flexible DC power grid based on combined-type high-voltage DC circuit breaker |
| CN104767185B (en) * | 2015-03-20 | 2017-07-21 | 浙江大学 | A kind of current conversion station and its control method with DC Line Fault Scavenging activity |
| CN107086547A (en) * | 2017-04-18 | 2017-08-22 | 浙江大学 | A kind of combined high-voltage dc circuit breaker and its self energizing strategy with self energizing ability |
-
2017
- 2017-09-29 CN CN201710909434.7A patent/CN107749615B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104767170A (en) * | 2014-01-06 | 2015-07-08 | 国家电网公司 | Mixed high-voltage direct-current circuit breaker and realization method thereof |
| CN104767185B (en) * | 2015-03-20 | 2017-07-21 | 浙江大学 | A kind of current conversion station and its control method with DC Line Fault Scavenging activity |
| CN105896488A (en) * | 2016-04-29 | 2016-08-24 | 浙江大学 | Short circuit fault processing method for flexible DC power grid based on combined-type high-voltage DC circuit breaker |
| CN107086547A (en) * | 2017-04-18 | 2017-08-22 | 浙江大学 | A kind of combined high-voltage dc circuit breaker and its self energizing strategy with self energizing ability |
Non-Patent Citations (2)
| Title |
|---|
| 柔性直流输电网的故障保护原理研究;徐政等;《高电压技术》;20170131;第43卷(第1期);第1-8页 |
| 适用于直流电网的组合式高压直流断路器;刘高任等;《电网技术》;20160131;第40卷(第1期);全文 |
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