CN110265986A - Direct current limiter topological structure suitable for flexible HVDC transmission system - Google Patents
Direct current limiter topological structure suitable for flexible HVDC transmission system Download PDFInfo
- Publication number
- CN110265986A CN110265986A CN201910482001.7A CN201910482001A CN110265986A CN 110265986 A CN110265986 A CN 110265986A CN 201910482001 A CN201910482001 A CN 201910482001A CN 110265986 A CN110265986 A CN 110265986A
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- transmission system
- hvdc transmission
- major loop
- circuit
- current
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Classifications
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- 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
- H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
- H02H9/021—Current limitation using saturable reactors
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Direct Current Feeding And Distribution (AREA)
- Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The present invention provides a kind of direct current limiter topological structures suitable for flexible HVDC transmission system, comprising: current-limiting reactor, major loop and current limliting circuit；Major loop formation parallel circuit in parallel with the current limliting circuit；The current-limiting reactor and the parallel circuit in series.Direct current limiter disclosed by the invention is installed at the DC port of converter station, and in system worked well, electric current flows through major loop；When system jam, current flow paths switch to current limliting circuit from major loop, can effectively inhibit the quick increase of fault current.Current limiter topological structure proposed by the present invention is lost smaller in normal operating conditions, can effectively inhibit the quick increase of fault current when breaking down, while energy dissipation is very fast, can be shortened the fault clearing time of high voltage DC breaker.
Description
Technical field
The present invention relates to transmission & distribution electro-technical fields, and in particular, to a kind of direct current suitable for flexible HVDC transmission system
Current limiter topological structure.
Background technique
The fast development for having benefited from power electronic devices industry, the flexible DC transmission skill based on insulated gate bipolar transistor
Art overcomes the defect that conventional high-tension direct current transportation is easy commutation failure.Flexible DC transmission, can be to nothing since its control is flexible
The advantages that source network is powered, is widely used in new energy and transmits at a distance, is the pass for constructing energy internet and smart grid
Key technology.
Flexible DC transmission faces DC grid fault clearance problem, is with the VSC-HVDC based on two level or three level
Example.When short trouble occurs for DC side overhead line, the capacitor for being connected in parallel on DC side discharges rapidly to fault point, and fault current exists
It can achieve tens times of rated current in several milliseconds；Meanwhile the fault current of side feed-in is exchanged, even if taking locking inverter
Measure, the fault current of AC system still can constitute circuit with the diode of IGBT reverse parallel connection, DC side fault point, therefore
Barrier electric current causes diode overcurrent and damages.
Dc-side short-circuit fault suppressing method is divided into three kinds by processing region: inhibiting exchange side feed-in electric current, controls the change of current
Device realizes the self-cleaning of dc-side short-circuit fault, cuts off failure using current limiter and dc circuit breaker.First two method can have
Effect inhibits the fault current of exchange side feed-in, and DC side parallel capacitor cannot be prevented to discharge to fault point, though the third method
Shunt capacitance bring dash current can so be inhibited, but due to being limited by Breaking capacity and turn-off time, high voltage direct current
The application case of breaker in practical projects is actually rare.
In current research, patent document CN108123427A discloses a kind of inductive type bidirectional, dc current limiter topology
Structure.The device is installed at the DC port of the converter station of DC transmission system, by circulation branch, diode string in parallel,
Transfer circuit and four part of current-limiting inductance branch composition.In system jam, fault current is transferred to the limit with big inductance
Branch is flowed, but the patent does not consider the detection time of fault current, and before not determining fault current, electric current is from through-flow branch
It flows through, very big fault current can be generated.
Patent document CN104184135B provides a kind of HVDC direct current limiter topological structure, and direct current limiter includes simultaneously
The IGBT of connection goes here and there, and in the reactor diode group of the middle position connection reverse parallel connection of IGBT string, forms bridge architecture；Bridge-type knot
Structure is in parallel with by-pass switch.The current limiter is bypassed in system worked well, is put into operation in the system failure, by two kinds
Constantly switch between current flow paths according to certain frequency, limitation DC current rises.But the direct current system can have commutation
The risk of failure.
Summary of the invention
For the defects in the prior art, the object of the present invention is to provide a kind of suitable for the straight of flexible HVDC transmission system
Flow current limiter topological structure.
A kind of direct current limiter topological structure suitable for flexible HVDC transmission system provided according to the present invention, comprising:
Current-limiting reactor, major loop and current limliting circuit；
Major loop formation parallel circuit in parallel with the current limliting circuit；
The current-limiting reactor and the parallel circuit in series.
Preferably, the major loop includes: that the IGBT pipe of two pairs of differential concatenations is serially connected with quick isolation switch UFD.
Preferably, the current limliting circuit includes inductance and resistance in parallel.
Preferably, the direct current limiter is installed at the DC port of the converter station of flexible HVDC transmission system.
Preferably, when the flexible HVDC transmission system operates normally, electric current passes through the major loop.
Preferably, when the flexible HVDC transmission system failure, the major loop shutdown, electric current is returned by the current limliting
Road.
Preferably, when the flexible HVDC transmission system failure, the IGBT pipe shutdown, the quick isolation switch UFD
It is disconnected within the 2-3ms time.
It preferably, further include dc circuit breaker, the dc circuit breaker and the parallel circuit in series.
Preferably, the dc circuit breaker includes major loop IGBT, the turn-off time of the major loop IGBT with it is described
The turn-off time of IGBT pipe is consistent.
A kind of direct current limiter topological structure suitable for flexible HVDC transmission system provided according to the present invention, comprising:
Current-limiting reactor, major loop and current limliting circuit；
Major loop formation parallel circuit in parallel with the current limliting circuit；
The current-limiting reactor and the parallel circuit in series；
The major loop includes: that the IGBT pipe of two pairs of differential concatenations is serially connected with quick isolation switch UFD；
The current limliting circuit includes inductance and resistance in parallel；
The direct current limiter is installed at the DC port of the converter station of flexible HVDC transmission system；
When the flexible HVDC transmission system operates normally, electric current passes through the major loop；
When the flexible HVDC transmission system failure, the major loop shutdown, electric current passes through the current limliting circuit；
When the flexible HVDC transmission system failure, the IGBT pipe shutdown, the quick isolation switch UFD is in 2-3ms
It is disconnected in time；
The direct current limiter topological structure further includes dc circuit breaker, the dc circuit breaker and the parallel circuit string
Connection；
The dc circuit breaker includes major loop IGBT, the pass of the turn-off time of the major loop IGBT and the IGBT pipe
Disconnected time consistency.
Compared with prior art, the present invention have it is following the utility model has the advantages that
1, direct current limiter proposed by the present invention is installed at the DC port of DC transmission system converter station, system just
Under normal operating condition, the inductance value of current-limiting reactor is lower, and on-state loss is smaller, and dynamic characteristic is preferable, in the case of simultaneous faults,
The quick increase of fault current can effectively be inhibited.
2, current limliting circuit proposed by the present invention is formed by inductance and resistor coupled in parallel, and resistance can both play the role of shunting,
The energy of inductance release can be absorbed again.
3, in current limliting circuit proposed by the present invention, the energy of inductance release some by resistance absorption, breaker excision
The time of failure shortens.
Detailed description of the invention
Upon reading the detailed description of non-limiting embodiments with reference to the following drawings, other feature of the invention,
Objects and advantages will become more apparent upon:
Fig. 1 is the circuit topological structure figure of direct current limiter of the present invention；
Fig. 2 is the current path figure under flexible HVDC transmission system operates normally；
Current path figure when Fig. 3 is flexible HVDC transmission system failure；
Fig. 4 is the test circuit topological structure figure of direct current limiter；
Fig. 5 is the simulation result schematic diagram for testing circuit.
Specific embodiment
The present invention is described in detail combined with specific embodiments below.Following embodiment will be helpful to the technology of this field
Personnel further understand the present invention, but the invention is not limited in any way.It should be pointed out that the ordinary skill of this field
For personnel, without departing from the inventive concept of the premise, several changes and improvements can also be made.These belong to the present invention
Protection scope.
As shown in Figure 1, a kind of direct current limiter topological structure suitable for flexible HVDC transmission system provided by the invention,
It include: current-limiting reactor, major loop and current limliting circuit.Major loop formation parallel circuit in parallel with current limliting circuit, current-limiting reactor
With parallel circuit in series.
Major loop includes: that the IGBT pipe of two pairs of differential concatenations is serially connected with quick isolation switch UFD；Current limliting circuit includes
Inductance and resistance in parallel；Direct current limiter is installed at the DC port of the converter station of flexible HVDC transmission system, with direct current
Breaker coordinated inhibits fault current.
As shown in Fig. 2, electric current passes through major loop when flexible HVDC transmission system operates normally.
As shown in figure 3, when flexible HVDC transmission system failure, when flexible HVDC transmission system failure, the shutdown of IGBT pipe, fastly
Fast disconnecting switch UFD is disconnected within the 2-3ms time, and dc circuit breaker includes major loop IGBT, the turn-off time of major loop IGBT
It is consistent with the turn-off time of IGBT pipe.
When flexible HVDC transmission system failure, system has the failure detection time of 2-3ms, IGBT pipe VT in the perioda、
VTb、VT1、VT2It is held on, after determining that failure occurs, the IGBT pipe of current limiter and dc circuit breaker major loop is disconnected, electric current stream
Path changes, and electric current flows through path and is transferred to current limliting circuit from the major loop of current limiter, turns from the major loop of breaker
Move to electric current commutating circuit, wherein RCD is residual current dc switch.Current limiter and breaker major loop are disconnected in 2-3ms
Quick isolation switch UFD, while the IGBT pipe VT of circuit breaker current commutating circuit3-VTnIt disconnects, electric current is transferred back to from breaker
Road moves to metal oxide MOA.
Further, it builds simulation model as shown in Figure 4 in PSCAD to be verified, parameter is as shown in table 1.
1 simulation model of table
Simulation result as shown in figure 5, though current-limiting reactor inductance value is small, current limiter can limit current in 9kA hereinafter,
Simultaneously because the energy of inductance release can be absorbed in current limiter current limliting loop resistance, accelerate the absorption of energy, breaker can be
Failure is cut off in 5ms.
Specific embodiments of the present invention are described above.It is to be appreciated that the invention is not limited to above-mentioned
Particular implementation, those skilled in the art can make a variety of changes or modify within the scope of the claims, this not shadow
Ring substantive content of the invention.In the absence of conflict, the feature in embodiments herein and embodiment can any phase
Mutually combination.
Claims (10)
1. a kind of direct current limiter topological structure suitable for flexible HVDC transmission system characterized by comprising current-limiting reactor
Device, major loop and current limliting circuit；
Major loop formation parallel circuit in parallel with the current limliting circuit；
The current-limiting reactor and the parallel circuit in series.
2. the direct current limiter topological structure according to claim 1 suitable for flexible HVDC transmission system, feature exist
In the major loop includes: that the IGBT pipe of two pairs of differential concatenations is serially connected with quick isolation switch UFD.
3. the direct current limiter topological structure according to claim 1 suitable for flexible HVDC transmission system, feature exist
In the current limliting circuit includes inductance and resistance in parallel.
4. the direct current limiter topological structure according to claim 1 suitable for flexible HVDC transmission system, feature exist
In the direct current limiter is installed at the DC port of the converter station of flexible HVDC transmission system.
5. the direct current limiter topological structure according to claim 1 suitable for flexible HVDC transmission system, feature exist
In when the flexible HVDC transmission system operates normally, electric current passes through the major loop.
6. the direct current limiter topological structure according to claim 1 suitable for flexible HVDC transmission system, feature exist
When, the flexible HVDC transmission system failure, the major loop shutdown, electric current passes through the current limliting circuit.
7. the direct current limiter topological structure according to claim 2 suitable for flexible HVDC transmission system, feature exist
When, the flexible HVDC transmission system failure, the IGBT pipe shutdown, the quick isolation switch UFD is within the 2-3ms time
It disconnects.
8. the direct current limiter topological structure according to claim 7 suitable for flexible HVDC transmission system, feature exist
In, it further include dc circuit breaker, the dc circuit breaker and the parallel circuit in series.
9. the direct current limiter topological structure according to claim 8 suitable for flexible HVDC transmission system, feature exist
In the dc circuit breaker includes major loop IGBT, when the shutdown of the turn-off time of the major loop IGBT and the IGBT pipe
Between it is consistent.
10. a kind of direct current limiter topological structure suitable for flexible HVDC transmission system characterized by comprising current limliting electricity
Anti- device, major loop and current limliting circuit；
Major loop formation parallel circuit in parallel with the current limliting circuit；
The current-limiting reactor and the parallel circuit in series；
The major loop includes: that the IGBT pipe of two pairs of differential concatenations is serially connected with quick isolation switch UFD；
The current limliting circuit includes inductance and resistance in parallel；
The direct current limiter is installed at the DC port of the converter station of flexible HVDC transmission system；
When the flexible HVDC transmission system operates normally, electric current passes through the major loop；
When the flexible HVDC transmission system failure, the major loop shutdown, electric current passes through the current limliting circuit；
When the flexible HVDC transmission system failure, the IGBT pipe shutdown, the quick isolation switch UFD is in the 2-3ms time
Interior disconnection；
The direct current limiter topological structure further includes dc circuit breaker, the dc circuit breaker and the parallel circuit in series；
The dc circuit breaker includes major loop IGBT, when the shutdown of the turn-off time of the major loop IGBT and the IGBT pipe
Between it is consistent.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910482001.7A CN110265986A (en) | 2019-06-04 | 2019-06-04 | Direct current limiter topological structure suitable for flexible HVDC transmission system |
| PCT/CN2019/094781 WO2020244015A1 (en) | 2019-06-04 | 2019-07-05 | Direct current limiter topology suitable for flexible direct current transmission system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910482001.7A CN110265986A (en) | 2019-06-04 | 2019-06-04 | Direct current limiter topological structure suitable for flexible HVDC transmission system |
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| CN110265986A true CN110265986A (en) | 2019-09-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910482001.7A Pending CN110265986A (en) | 2019-06-04 | 2019-06-04 | Direct current limiter topological structure suitable for flexible HVDC transmission system |
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| WO (1) | WO2020244015A1 (en) |
Cited By (3)
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| CN112086943A (en) * | 2020-09-02 | 2020-12-15 | 东南大学 | Active fault current-limiting circuit and all-solid-state direct current breaker |
| CN112260245A (en) * | 2020-09-28 | 2021-01-22 | 深圳供电局有限公司 | Current limiting device and method, direct current power grid protection device and direct current power grid system |
| WO2021119938A1 (en) * | 2019-12-16 | 2021-06-24 | 西门子股份公司 | Hybrid circuit breaker, hybrid circuit breaker system, and circuit breaker method |
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| WO2020244015A1 (en) | 2020-12-10 |
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Application publication date: 20190920 |