CN207218522U - Fault current limiter, converter unit and modular multistage converter - Google Patents
Fault current limiter, converter unit and modular multistage converter Download PDFInfo
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- CN207218522U CN207218522U CN201720678186.5U CN201720678186U CN207218522U CN 207218522 U CN207218522 U CN 207218522U CN 201720678186 U CN201720678186 U CN 201720678186U CN 207218522 U CN207218522 U CN 207218522U
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- 239000004020 conductor Substances 0.000 claims abstract description 69
- 239000003990 capacitor Substances 0.000 claims description 6
- 239000004065 semiconductor Substances 0.000 claims description 6
- 230000005611 electricity Effects 0.000 claims description 2
- 230000005672 electromagnetic field Effects 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 2
- 230000002457 bidirectional effect Effects 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 208000026817 47,XYY syndrome Diseases 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 230000002146 bilateral effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000001066 destructive effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- FFUAGWLWBBFQJT-UHFFFAOYSA-N hexamethyldisilazane Chemical compound C[Si](C)(C)N[Si](C)(C)C FFUAGWLWBBFQJT-UHFFFAOYSA-N 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000001846 repelling effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
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Abstract
This disclosure relates to fault current limiter FCL (5), for power converter and is configured to connect as crowbar circuit across the energy accumulator of power converter.FCL includes：It is configured to input the first electric conductor (6a) of feeder；It is configured as output to the second electric conductor (6b) of feeder；With short-circuit device (4), it is connected between the first electric conductor and the second electric conductor so that first interface is formed between the first electric conductor and short-circuit device, and second interface is formed between the second electric conductor and short-circuit device.First electric conductor and the second electric conductor be arranged so that when electric current flows through the first electric conductor and the second electric conductor, electric current flowed through at first interface the first electric conductor (6a) direction flowed through with electric current at second interface the second electric conductor (6b) direction it is identical.Thus avoid concentrating electromagnetic field, so as to mechanical force of the restriction effect on the conductor and equipment short circuit of crowbar circuit.The disclosure further relates to a kind of converter unit and modular multistage converter.
Description
Technical field
This disclosure relates to the fault current limiter (FCL) for power converter.
Background technology
FCL is the equipment of limiting short-circuit current in case of a fault.Otherwise, electric current is likely to be breached the high level of danger, damage
Bad part, and may set off an explosion.Power converter is typically to apply, if wherein power electronic equipment breaks down simultaneously
And two semiconductor switch simultaneously turn on, then the capacitor bank of converter unit can be short-circuit, causes big surge current.
In the event of short circuit, the electric current more than one megampere (MA) is about can reach in some applications, is caused violent quick-fried
It is fried.High current causes the big electromagnetic force of about several meganewtons (MN), and this may be harmful to any converter unit topology.Some
In, using such as crowbar circuit including IGCT, it is only just triggered to turn on short circuit electricity in case of a failure
Flow and safely short circuit current is failed.
Utility model content
Under normal circumstances, if fault current is not too big, the Machine Design of crowbar circuit is less important.However,
Now it has been noted that in some applications, fault current may be very big, is thus attributed to the conductor for acting on crowbar circuit
On big electromagnetic force and may not install and use traditional design installation crowbar circuit.Due to railgun principle, in electromagnetic force
In the presence of IGCT is outwards projected, and make it that IGCT is mobile and launches spark.Crowbar circuit (such as including crystalline substance
Brake tube) short-circuit device, may finally be soldered on conductor, or even project circuit completely as emitter.
Embodiment of the present utility model solves problem of the prior art by using different Geometrical changes, to avoid collecting
Middle electromagnetic field, so as to which restriction effect is in the conductor (herein also referred to as inputting feeder and output feeder) and equipment of crowbar circuit
Mechanical force in short circuit.The input feeder of crowbar circuit is separated with output feeder and substantially reduces caused electromagnetic force,
Avoid spark from being formed and reduce the movement of short-circuit device.
Short-circuiting means can be any suitable equipment for crowbar circuit, it may for example comprise the crowbar circuit of IGCT,
IGCT such as triode for alternating current (TRIAC, bidirectional triode thyristor or the pole IGCT of bilateral three) or without grid
(Trisil) voltage-controlled TRIAC or integrated gate commutated thyristor (IGCT) or double mode gated transistor
(BIGT) thyratron, preferably IGCT.
According to one side of the present utility model, there is provided a kind of fault current limiter (FCL), for power converter and
It is arranged to be connected across the energy accumulator of power converter, for example, as crowbar circuit.FCL includes：It is configured as
Input the first electric conductor of feeder；It is configured as exporting the second electric conductor of feeder；And short-circuit device, such as including brilliant lock
Pipe, the short-circuit device are connected between the first electric conductor and the second electric conductor so that between the first electric conductor and short-circuit device
First interface is formed, and second interface is formed between the second electric conductor and short-circuit device.First electric conductor and the second conductance
Body is arranged such that electric current flows through the first conductance at first interface when electric current flows through the first electric conductor and the second electric conductor
The direction of body is identical in the direction that second interface flows through the second electric conductor with electric current.Therefore, when with short-circuit device interface,
First interface and second interface (i.e. the first conductor and the second conductor) are moved in parallel relative to each other, and wherein short-circuit device is arranged in
Between first interface and second interface, and electric current flows in the conductor in same direction at first interface and second interface,
With flowing in opposite direction strong and destructive repulsive force will be caused to be contrasted between the first conductor and the second conductor.
According to another aspect of the present utility model, there is provided a kind of converter unit, including semiconductor switch, energy stores
The embodiment of device and the FCL of the disclosure, FCL are connected as crowbar circuit across energy accumulator.
According to another aspect of the present utility model, there is provided a kind of MMC, include a reality of the converter unit of the disclosure
Apply multiple chain-link converter units of example.
Embodiment of the present utility model is comparatively safe and adds the reliability of power converter.
It should be noted that any feature of any aspect goes for any other appropriate aspect.Similarly, Ren Hefang
Any advantage in face goes for any other aspect.The other purposes of appended embodiment, feature and advantage will from it is following in detail
Thin disclosure, it is apparent from appended dependent claims and accompanying drawing.
Generally, all terms used in claims all should explain according to its ordinary meaning of technical field, remove
It is non-to explicitly define otherwise herein.All references " one/mono-/element, equipment, part, device, step etc. " solve with being opened
It is interpreted as referring at least one example of element, equipment, part, device, step etc., unless expressly stated otherwise,.It is disclosed herein
Any method the step of need not be performed in the exact order disclosed, unless expressly stated.For the disclosure different characteristic/
The use of " first " of part, " second " etc. is only intended to make a distinction features/components and other similar characteristics/parts, without
It is to confer to any order of features/components or level.
Brief description of the drawings
Embodiment will be described with reference to by way of example, wherein：
Fig. 1 is the schematic circuit according to the embodiment of power converter unit of the present utility model.
Fig. 2 is the schematic circuit according to the FCL of comparative example.
Fig. 3 is the schematic circuit according to FCL of the present utility model embodiment.
Fig. 4 is the schematic circuit according to FCL of the present utility model another embodiment.
Embodiment
Embodiment is described more fully with referring now to accompanying drawing, some embodiments are shown in the drawings.However, at this
In scope of disclosure, many various forms of other embodiments are possible.On the contrary, following implement is provided by way of example
Example so that the disclosure will thoroughly and completely, and will fully pass on the scope of the present disclosure to those skilled in the art.
Identical reference refers to identical element in whole description.
Fig. 1 shows the embodiment of the converter unit 2 of power converter 1.Converter unit is opened including multiple semiconductors
S is closed, for example, forming half-bridge or full-bridge (also referred to as H bridges or bipolar) topology.In the embodiment in figure 1, opened by four semiconductors
Close S1, S2, S3 and S4 and form full-bridge topology.Converter unit 2 also includes energy accumulator 3, and the energy accumulator 3 is usually to wrap
Include the form of the capacitor device of at least one capacitor or including the capacitor device.FCL5 deposits in the mid-span energy of unit 2
Reservoir 3 is connected as crowbar circuit, so as to protect energy accumulator in order to avoid being influenceed by fault current.FCL include by with
It is set to the first electric conductor 6a of input feeder and is configured as exporting the second electric conductor 6b of feeder, vice versa, and this takes
FCL direction is certainly flowed through in fault current.First conductor 6a and the second conductor 6b is connected to each other and each other by short-circuit device 4
Separation, be bidirectional triode thyristor (TRIAC) here, but can be any suitable equipment, it may for example comprise IGCT or
(preferably) double mode gated transistor (BIGT).Short-circuit device can be unipolarity or ambipolar, preferably ambipolar
(can turn in the two directions).FCL is preferably configured as turning on big fault current, for example, at least 1MA or 2MA,
In this case, it is used for repelling the first conductor 6a in traditional FCL and the second conductor 6b electromagnetic force is too big.First conductor
6a and the second conductor 6b may, for example, be big copper coin, and it can conduct big in the case where not producing too many resistance and heating
Fault current.
Power converter 1 can be any power converter, particularly high-voltage power converter, such as may wherein occur
The converter of at least 1MA big fault current.Its typical case is to be used for the converter of HVDC (HVDC) application, still
It is also contemplated that other application.Converter 1 can be 2 or 3 level conversion devices or the converter of any other type, but typical
Ground, converter is modular multistage converter (MMC), wherein multiple units 2 are serially connected in each phase of converter
(also referred to as chain type or cascade).The multiphase MMC (being usually three-phase MMC) that can be used in embodiment of the present utility model can have
There is any conventional topology, for example, delta (Δ), wye (Y) types or double Y (double-wye) topologys.
Fig. 2 shows the conventional FLC as comparative example.Here the first conductor 6a and the second conductor 6b cloth relative to each other
Put so that the fault current in (first) interface flowing of itself and short-circuit device 4 in the first conductor 6a has and led with second
Body 6b is in its direction opposite with the sense of current that (second) interface of short-circuit device 4 flows through.By the electric current shape for flowing through conductor
Into the electromagnetism that is formed of electromagnetic field try hard to it is middle shown with double-headed arrow, repel conductor (promote conductor away from each other).The repulsive force
Any one that may cause in conductor 6a and conductor 6b disconnect with the connection of short-circuit device, or even result in short-circuit device from
Crowbar circuit projects.
Fig. 3 and Fig. 4 shows two different embodiments of the present utility model, wherein the first conductor 6a and the second conductor 6b
It is arranged so that in the first conductor 6a in the first conductor 6a and the fault current of (first) interface flowing of short-circuit device 4
Flow direction is identical with the sense of current that second conductor 6b is flowed through with (second) interface of short-circuit device 4 in the second conductor 6b
(although parallel shifted).By this arrangement, the electromagnetic force formed at short-circuit device 4 between conductor 6a and conductor 6b is used
In conductor is all pressed into short-circuit device, so as to reduce the danger that short-circuit device disconnects with crowbar circuit during failure.In addition,
The conductor 6a and conductor 6b first interface of remote short-circuit device 4 and the appropriate section of second interface subtracts further away from each other
Lack by influence of the electromagnetic field that fault current is formed to it.
Therefore, concentrated on mainly due to electromagnetic field on the power electronic device of converter unit 2.Shown in Fig. 2 to cause
Input feeder 6a and export the crowbar circuits 5 installed close to each other of feeder 6b may exist high short circuit current (such as
At least 1MA) in the case of do not work.What this caused big impact is radially directed towards thrust.Therefore, according to of the present utility model
The solution of some embodiments is will to separate the input feeder and output feeder point of crowbar circuit as shown in Figure 3 and Figure 4
Leave.This reduce the concentration in magnetic field, so as to be substantially reduced the power of application.As a result, spark, and power electronic devices are eliminated
May more safely it be held in place by.
The disclosure is essentially described above by reference to several embodiments.However, as readily understood by the skilled person that
Sample, in the scope of the present disclosure that appended claims are limited, except embodiment disclosed above, other embodiment is equally
It is possible.
Claims (9)
1. a kind of fault current limiter (5), for power converter (1) and it is arranged to the energy across the power converter
Memory (3) and be connected, it is characterised in that the fault current limiter includes：
It is configured as input to the first electric conductor (6a) of feeder；
It is configured as exporting the second electric conductor (6b) of feeder；And
Short-circuit device (4), it is connected between first electric conductor and second electric conductor so that in first conductance
Form first interface between body (6a) and the short-circuit device, and second electric conductor (6b) and the short-circuit device it
Between form second interface；
Wherein described first electric conductor and second electric conductor be arranged such that when electric current flow through first electric conductor and
During second electric conductor, the electric current flows through the direction of first electric conductor (6a) and the electricity at the first interface
The direction that stream flows through second electric conductor (6b) at the second interface is identical.
2. fault current limiter according to claim 1, it is characterised in that the short-circuit device (4) includes IGCT.
3. fault current limiter according to claim 1, it is characterised in that the short-circuit device (4) is insulated including double mode
Grid IGCT.
4. according to the fault current limiter described in any one of claim 1-3, it is characterised in that the fault current limiter by with
Put the electric current for being at least 1MA.
A kind of 5. converter unit (2), it is characterised in that including：
Semiconductor switch (S)；
Energy accumulator (3)；And
Fault current limiter (5) according to any one preceding claims, the fault current limiter (5) is across the energy stores
Device is connected as crowbar circuit.
6. converter unit (2) according to claim 5, it is characterised in that the energy accumulator includes at least one
The capacitor device of capacitor.
7. the converter unit (2) according to claim 5 or 6, it is characterised in that the semiconductor switch (S) forms half
Bridge or full-bridge topology.
8. a kind of modular multistage converter (1), it is characterised in that according to claim 7 turn including multiple chain types
Exchange unit (2).
9. modular multistage converter according to claim 8, it is characterised in that the modular multistage converter by with
Put and be used for high-voltage direct-current application.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720678186.5U CN207218522U (en) | 2017-06-12 | 2017-06-12 | Fault current limiter, converter unit and modular multistage converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720678186.5U CN207218522U (en) | 2017-06-12 | 2017-06-12 | Fault current limiter, converter unit and modular multistage converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207218522U true CN207218522U (en) | 2018-04-10 |
Family
ID=61811851
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720678186.5U Active CN207218522U (en) | 2017-06-12 | 2017-06-12 | Fault current limiter, converter unit and modular multistage converter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207218522U (en) |
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2017
- 2017-06-12 CN CN201720678186.5U patent/CN207218522U/en active Active
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20210608 Address after: Baden, Switzerland Patentee after: ABB grid Switzerland AG Address before: Ba Deng Patentee before: ABB Switzerland Co.,Ltd. |
|
| TR01 | Transfer of patent right | ||
| CP01 | Change in the name or title of a patent holder |
Address after: Swiss Baden Patentee after: Hitachi energy Switzerland AG Address before: Swiss Baden Patentee before: ABB grid Switzerland AG |
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| CP01 | Change in the name or title of a patent holder | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20240111 Address after: Zurich, SUI Patentee after: Hitachi Energy Co.,Ltd. Address before: Swiss Baden Patentee before: Hitachi energy Switzerland AG |
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| TR01 | Transfer of patent right |