CN107800120B - A kind of capacitive dc circuit breaker and its DC Line Fault processing strategie - Google Patents
A kind of capacitive dc circuit breaker and its DC Line Fault processing strategie Download PDFInfo
- Publication number
- CN107800120B CN107800120B CN201710910464.XA CN201710910464A CN107800120B CN 107800120 B CN107800120 B CN 107800120B CN 201710910464 A CN201710910464 A CN 201710910464A CN 107800120 B CN107800120 B CN 107800120B
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- China
- Prior art keywords
- circuit breaker
- main circuit
- diode
- fault
- disconnecting switch
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Classifications
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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
- H02H7/261—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 involving signal transmission between at least two stations
- H02H7/262—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 involving signal transmission between at least two stations involving transmissions of switching or blocking orders
-
- 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 capacitive dc circuit breaker and its DC Line Fault processing strategie, including main circuit breaker, disconnecting switch and reactor, main circuit breaker is made of in series and parallel multiple submodules with two-way through-current capability.The present invention by seal in capacitor in the way of change the property of fault current, so that fault current is generated zero crossing and then block fault current；IGBT negligible amounts needed for present invention manufacture simultaneously, can be significantly reduced project cost, have very high engineering reference significance.
Description
Technical field
The invention belongs to power electronic system technical fields, and in particular to a kind of capacitive dc circuit breaker and its direct current therefore
Hinder 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 by the way of adding dc circuit breaker using half-bridge submodule MMC to constitute DC grid, dc circuit breaker just at
For the key element of DC grid.High voltage DC breaker structural scheme focuses primarily upon 3 seed types at present, is based on respectively
Tradition machinery type breaker, the solid circuit breaker based on pure power electronic devices and the mixing combined based on the two of ordinary tap
Type breaker.Although having developed technically feasible high voltage DC breaker at present, its is with high costs, bulky, difficult
To be widely used in power grid as AC circuit breaker；Therefore, dc circuit breaker is still the essence for developing DC grid
Technical bottleneck.
Summary of the invention
In view of above-mentioned, the present invention provides a kind of capacitive dc circuit breaker and its DC Line Fault processing strategies, utilize
The mode for sealing in capacitor changes the property of fault current, so that fault current is generated zero crossing and then blocks fault current；Together
When the present invention manufacture needed for IGBT negligible amounts, project cost can be significantly reduced, have very high engineering reference significance.
A kind of capacitive dc circuit breaker, including reactor, disconnecting switch and main circuit breaker；Wherein, the one of reactor
End is connected with converter station, and the other end of reactor is connected with one end of disconnecting switch, the other end and main circuit breaker of disconnecting switch
One end be connected, the other end of main circuit breaker is connected with DC power transmission line；The main circuit breaker is by multiple with two-way through-flow
The submodule of ability forms in series and parallel.
Further, the submodule uses full-bridge sub-modular structure or enhanced half-bridge sub-modular 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 C；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 C, IGBT pipe
The emitter of T2 is connected with the cathode of diode D2 and the other end as submodule, and the anode of diode D1 is with diode D2's
The other end of anode and capacitor C are connected, and the base stage of IGBT pipe T1~T2 connects the switch control letter of external control circuit offer
Number.
The DC Line Fault processing strategie of the capacitive dc circuit breaker, includes the following steps:
(1) when operating normally, it is closed disconnecting switch, all submodules are in opening state in main circuit breaker, then direct current
Electric current normally flows through main circuit breaker；
(2) DC power transmission line occurs under ground fault condition, after detecting fault current, owns in main circuit breaker
Submodule applies cut-off signals, so that the capacitor in submodule is sealed in fault loop, blocks fault current path；
(3) after fault current is blocked, disconnecting switch is finally disconnected.
Compared with prior art, the present invention has following advantageous effects:
1. the present invention can control fault current peak value in reduced levels, influence of the DC Line Fault to system is reduced.
2. the present invention can be pre-charged by the capacitor to the submodule in main circuit breaker, significantly reduces and block failure
Time needed for electric current, quickly cut off DC Line Fault.
3. the present invention builds required IGBT negligible amounts, project cost can be significantly reduced, reduce cost of investment.
Detailed description of the invention
Fig. 1 is the topological structure schematic diagram of the capacitive 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. 3 (a) is simulation waveform schematic diagram of the capacitive dc circuit breaker of the present invention under non-precharge condition.
Fig. 3 (b) is simulation waveform schematic diagram of the capacitive dc circuit breaker of the present invention under precharge condition.
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, the capacitive dc circuit breaker of the present invention, including main circuit breaker, disconnecting switch and reactor；Its
In, main circuit breaker one end is connected with DC line, and the other end is connected with disconnecting switch；The other end of disconnecting switch and reactor
One end is connected, and the other end of reactor is connected with converter station.
Main circuit breaker is made of in series and parallel multiple submodule SM, and the submodule in main circuit breaker needs two-way through-flow energy
Power can enhance there are many kinds of topological structure for example, by using shown in full-bridge sub-modular structure shown in Fig. 2 (a) or Fig. 2 (b)
Type half-bridge sub-modular structure.
The DC Line Fault processing strategie of the capacitive dc circuit breaker of the present invention includes:
(1) when operating normally, disconnecting switch is closed, and all submodules are in excision state, DC current in main circuit breaker
Main circuit breaker can normally be flowed through.
(2) ground fault occurs for DC line, and system is after detecting fault current, to submodules all in main circuit breaker
Apply block signal, the capacitor in submodule is sealed in into fault loop, blocks fault current path.
(3) after fault current is blocked, disconnecting switch is disconnected.
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, main circuit breaker use enhanced half-bridge submodule, main circuit breaker equivalent capacitance value be 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 the enhanced half-bridge submodule after failure in 3ms dc circuit breaker is latched (i.e. to all enhanced
2 IGBT in half-bridge submodule apply cut-off signals).Fig. 3 gives direct fault current, MMC DC voltage and direct current
The change curve of voltage is born on breaker；Wherein Fig. 3 (a) is emulation knot when dc circuit breaker equivalent capacity is not pre-charged
Fruit, Fig. 3 (b) are simulation results when dc circuit breaker equivalent capacity is pre-charged to 400kV.
From figure 3, it can be seen that the DC side overvoltage in two situations is close, it is all 600kV or so, and have preliminary filling
Fault current when electric is smaller, fault current is shorter to the zero-time, 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 (1)
1. a kind of DC Line Fault processing strategie of capacitive dc circuit breaker, the capacitive dc circuit breaker include reactor,
Disconnecting switch and main circuit breaker；Wherein, one end of reactor is connected with converter station, the other end of reactor and disconnecting switch
One end is connected, and the other end of disconnecting switch is connected with one end of main circuit breaker, the other end and DC power transmission line of main circuit breaker
It is connected；The main circuit breaker is made of in series and parallel multiple submodules with two-way through-current capability；
The submodule uses full-bridge sub-modular structure or enhanced half-bridge sub-modular structure, the enhanced half-bridge submodule agllutination
Structure includes two IGBT pipe T1~T2 with anti-paralleled diode, two diode D1~D2 and a capacitor C；Wherein,
The emitter of IGBT pipe T1 is connected with the cathode of diode D1 and one end as submodule, the collector and IGBT of IGBT pipe T1
The collector of pipe T2 and one end of capacitor C are connected, and the emitter of IGBT pipe T2 is connected and as son with the cathode of diode D2
The anode of the other end of module, diode D1 is connected with the other end of the anode of diode D2 and capacitor C, IGBT pipe T1~T2
Base stage connect external control circuit offer switch control signal；
The DC Line Fault processing strategie includes the following steps:
(1) when operating normally, it is closed disconnecting switch, all submodules are in opening state in main circuit breaker, then DC current
Normally flow through main circuit breaker；
(2) DC power transmission line occurs under ground fault condition, after detecting fault current, to submodules all in main circuit breaker
Block applies cut-off signals, so that the capacitor in submodule is sealed in fault loop, blocks fault current path；
(3) after fault current is blocked, disconnecting switch is finally disconnected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710910464.XA CN107800120B (en) | 2017-09-29 | 2017-09-29 | A kind of capacitive dc circuit breaker and its DC Line Fault processing strategie |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710910464.XA CN107800120B (en) | 2017-09-29 | 2017-09-29 | A kind of capacitive dc circuit breaker and its DC Line Fault processing strategie |
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| CN107800120A CN107800120A (en) | 2018-03-13 |
| CN107800120B true CN107800120B (en) | 2019-02-26 |
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| CN112564072B (en) * | 2020-12-01 | 2022-06-17 | 南京工程学院 | Modular multifunctional fault current limiter and control method thereof |
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| CN103178486B (en) * | 2013-02-27 | 2016-12-28 | 国网智能电网研究院 | A kind of dc circuit breaker and cutoff method thereof |
| CN104052026B (en) * | 2014-05-29 | 2016-05-25 | 华中科技大学 | For submodule topology and the application thereof of modularization multi-level converter |
| 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 |
| CN105914772B (en) * | 2016-04-26 | 2019-03-05 | 华中科技大学 | The mixed type DC transmission system and control method for having DC Line Fault blocking ability |
| CN107026577B (en) * | 2017-04-21 | 2019-05-21 | 清华大学 | A kind of modularization multi-level converter of cut-off direct-current short circuit fault current |
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