CN203859676U - Power unit module of power electronic converter - Google Patents
Power unit module of power electronic converter Download PDFInfo
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- CN203859676U CN203859676U CN201420282327.8U CN201420282327U CN203859676U CN 203859676 U CN203859676 U CN 203859676U CN 201420282327 U CN201420282327 U CN 201420282327U CN 203859676 U CN203859676 U CN 203859676U
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- 239000003990 capacitor Substances 0.000 claims abstract description 10
- 230000002457 bidirectional effect Effects 0.000 abstract 1
- 230000005540 biological transmission Effects 0.000 description 7
- 230000000694 effects Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 239000004065 semiconductor Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
Abstract
The utility model provides a power unit module of a power electronic converter. The power unit module of the power electronic converter comprises a T-shaped power sub module, a direct-current capacitor and a current-limiting reactor. Three branches of the T-shaped power sub module are respectively provided with a full-controlled device group. The direct-current capacitor is connected to two ends of horizontal branches in parallel. The current-limiting reactor is connected to two ends of the full-controlled device group on a vertical branch. The full-controlled device groups on the horizontal branches of the T-shaped power sub module are arranged in the same direction. The full-controlled device group on the vertical branch is connected with a connecting point of the horizontal branches through a collector electrode of a power electronic device. Compared with the prior art, the power unit module of the power electronic converter is capable of cutting off bidirectional fault currents, high in response speed and good in selectivity.
Description
Technical field
The utility model relates to a kind of power unit module, is specifically related to a kind of power unit module of power electronics converter.
Background technology
Technology of HVDC based Voltage Source Converter and Survey of Flexible AC Transmission System Technology are being brought into play the effect becoming more and more important in intelligent grid construction and generation of electricity by new energy field; Because short trouble in electric power system is the most serious damage, therefore guarantee the normal operation of flexible DC power transmission and Survey of Flexible AC Transmission System, need to remove short trouble by power electronics converter; Divide based on principle, change of current stream device is processed short-circuit current and is comprised:
1.: utilize other equipment of converter alternating current-direct current side (as AC and DC circuit breaker) isolated fault point;
Wherein, DC circuit breaker is not yet extensively approved and is applied in high voltage direct current field; AC circuit breaker is because mechanical switch response is slower, and the fast motion time is 40-60ms, is difficult to the fast transient process of response power electronic system Millisecond, and repeatedly cut-offs the life-span that can shorten AC circuit breaker.For example, when in prior art, flexible DC power transmission engineering is by AC circuit breaker disengagement failure electric current, each DC side fault all can cause flexible DC power transmission system to stop transport, and has seriously responded system availability.
2.: utilize converter self to control the removing that realizes fault current;
Power electronics converter is combined by one or more power submodules conventionally, and therefore the performance of converter directly depends on the performance of adopted power submodule.General two level converters or the modularization multi-level converter etc. of adopting of the power electronics converter in flexible DC power transmission field in prior art.Wherein, two level converters mainly adopt bridge-type topology; The power cell that modularization multi-level converter adopts comprises the multiple power submodules such as bridge-type submodule, semi-bridge type submodule or clamp Shuangzi module:
In the time that Converter DC-side is short-circuited fault, bridge-type submodule (with two level converters) can cut off by locking the electric current of twocouese, but it needs the semiconductor device of double amount, invests excessive; Semi-bridge type submodule, flows back to road and uncontrollable because itself and the antiparallel diode of IGBT device can form the energy feedback that fault point is directly connected with AC system, does not therefore possess direct current locking function; Clamp Shuangzi module, although the semiconductor device adopting is fewer than bridge-type sub modular structure, but due to the feature of self topological structure, the electric capacity of system clamp Shuangzi module after locking can charge repeatedly, required time of cutting-off of short-circuit electric current is longer than bridge-type, and fault current control effect is unsatisfactory.
Therefore, due to limiting short-circuit current effectively, very easily there is overcurrent locking or tripping operation in the existing high-power electric and electronic converter based on full control device in the time of the system failure, seriously reduced the availability factor of device and the safety and stability level of electric power system.Provide a kind of Novel power unit module to guarantee that power electronics converter has the ability of fault of removing and seems particularly important.
Summary of the invention
In order to meet the needs of prior art, the utility model provides a kind of power unit module of power electronics converter, and described power unit module comprises T shape power submodule, DC capacitor and current limiting reactor; Three branch roads of described T shape power submodule are provided with full-control type device group; Described DC capacitor is connected in parallel on horizontal branches two ends; Described current limiting reactor is connected in parallel on the two ends of the full-control type device group on vertical branch road.
Preferably, described full-control type device group comprises the power electronic device being connected in series; Described power electronic device adopts any one in IGBT, IGCT and GTO;
Preferably, diode of reverse parallel connection between the collector and emitter of described power electronic device;
Preferably, in described T shape power submodule, the full-control type device group in horizontal branches arranges in the same way; The full-control type device group of described vertical branch road is connected with the tie point of described horizontal branches by power electronic device collector electrode;
Preferably, when described power unit module series connection, be connected successively with the power electronic device emitter of horizontal branches in another T shape power submodule by the power electronic device emitter of vertical branch road in T shape power submodule;
Preferably, a by-pass switch in parallel between the horizontal branches by power electronic device collector electrode vertical connecting branch road and described vertical branch road in described T shape power submodule.
Compared with immediate prior art, excellent effect of the present utility model is:
1, in technical solutions of the utility model, the T shape power submodule based on power electronic device can excise two-way fault current, thereby the power electronics converter of the power unit module that guarantee employing the utility model provides is effectively removed bi-directional failure electric current;
2, in technical solutions of the utility model, T shape power submodule adopts power electronics device disengagement failure electric current, and fast response time, selectivity are good;
The power unit module of a kind of power electronics converter that 3, the utility model provides, power electronic device quantity is few, is convenient to power electronics converter and carries out modularized design.
Brief description of the drawings
Below in conjunction with accompanying drawing, the utility model is further illustrated.
Fig. 1 is: bridge-type sub modular structure figure;
Fig. 2 is: semi-bridge type sub modular structure figure;
Fig. 3 is: clamp Shuangzi modular structure figure;
Fig. 4 is: faulty circuit figure when Converter DC-side short circuit;
Fig. 5 is: a kind of power unit module structure chart of power electronics converter in the utility model embodiment;
Fig. 6 is: full-control type device group structure chart in the utility model embodiment;
Fig. 7 is: T shape submodule blocking schematic diagram in the utility model embodiment;
Fig. 8 is: T shape submodule working state schematic representation in the utility model embodiment;
Fig. 9 is: T shape submodule excision view in the utility model embodiment;
Figure 10 is: T shape submodule limited current state schematic diagram in the utility model embodiment;
Figure 11 is: the power electronics converter structure figure based on power unit module in the utility model embodiment.
Embodiment
Describe embodiment of the present utility model below in detail, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has the element of identical or similar functions from start to finish.Be exemplary below by the embodiment being described with reference to the drawings, be intended to for explaining the utility model, and can not be interpreted as restriction of the present utility model.
As Fig. 1-3 show respectively in flexible DC power transmission field the power cell structure of the power electronics converter conventionally adopting, comprise bridge-type sub modular structure, semi-bridge type sub modular structure and clamp Shuangzi modular structure; In the time that Converter DC-side is short-circuited fault, bridge-type submodule cuts off the electric current of twocouese by locking as shown in Figure 4, but needs the semiconductor device of double amount, invests excessive; In semi-bridge type submodule, flow back to road and uncontrollable owing to can forming with the antiparallel diode of power electronic device the energy feedback that fault point is directly connected with AC system, therefore do not possess direct current locking function; Clamp Shuangzi module its electric capacity after locking can charge repeatedly, and the short circuit current mute time is longer, and therefore fault current control effect is undesirable.
The defect that can not effectively remove fault current for overcoming power electronics converter in prior art, the utility model provides a kind of power unit module of power electronics converter as shown in Figure 5;
In the present embodiment, the power cell of power electronics converter comprises T shape power submodule, DC capacitor C and current limiting reactor L; T shape power submodule comprises two horizontal branches and a vertical branch road; Three branch roads of T shape power submodule are provided with full-control type device group; DC capacitor C is connected in parallel on two horizontal branches two ends; Current limiting reactor L is connected in parallel on the two ends of the full-control type device group on vertical branch road.
The concrete structure of T shape power submodule bag is:
1.: as shown in Figure 6, the full-control type device group on three branch roads includes N the power electronic device being connected in series, and N is at least 1; Power electronic device adopts any one in IGBT, IGCT and GTO; In the present embodiment, full-control type device group comprises respectively a power electronic device, and as shown in Figure 5, horizontal branches is respectively power electronic device T
1and T
2, vertically branch road is power electronic device T
3;
2.: diode of reverse parallel connection between the collector and emitter of power electronic device, as shown in Figure 5, power electronic device T
1two ends anti-paralleled diode D
1, power electronic device T
2two ends anti-paralleled diode D
2, power electronic device T
3two ends anti-paralleled diode D
3;
3.: the full-control type device group in two horizontal branches is in the same way and arranges; Vertically the full-control type device group of branch road is connected with the tie point of two horizontal branches by the collector electrode of power electronic device, as shown in Figure 5, and power electronic device T
3collector electrode and power electronic device T
1with power electronic device T
2tie point be connected.
4.: the horizontal branches by power electronic device collector electrode vertical connecting branch road in T shape power submodule and vertically a by-pass switch in parallel between branch road, as shown in Figure 5, power electronic device T
3emitter and power electronic device T
2emitter between a by-pass switch Km in parallel.
When the power unit module that adopts the utility model to provide connects and composes Modularized power electronic inverter as shown in figure 11, if power unit module is connected, be connected successively with the power electronic device emitter of horizontal branches in another T shape power submodule by the power electronic device emitter of vertical branch road in T shape power submodule; When two power unit module is connected in series as shown in Figure 5, the A end of a power unit module is connected with the B end of another power unit module.
The specific works process of the power unit module of the power electronic device that the utility model provides is:
When electric power system DC side is normally worked or occurs short trouble, in Figure 11, the electric power electric device of T shape power submodule is opened or is turn-offed by the drive circuit of described power electronic device, thereby charges respectively, electric discharge, bypass and current limliting;
Following table shows the operating state example of power electronic device:
1.: pattern one; As shown in Figure 7, power electronics converter T in T shape submodule
1and T
2shutoff, T
3conducting, diode D
1and D
3conducting, D
2turn-off capacitor charging;
2.: pattern two; As shown in Figure 8, power electronics converter T in T shape submodule
1and T
3conducting, T
2turn-off diode D
3conducting, D
1and D
2turn-off capacitor discharge;
3.: pattern three; As shown in Figure 9, power electronics converter T in T shape submodule
1and T
3shutoff, T
2conducting, diode D
3conducting, D
1and D
2turn-off power unit module bypass;
4.: pattern four; As shown in figure 10, power electronics converter T in T shape submodule
1and T
2shutoff, T
3conducting, diode D
1and D
3shutoff, D
2conducting, in power unit module, current limliting is carried out in current limiting reactor access.
Finally should be noted that: described embodiment is only some embodiments of the present application, instead of whole embodiment.Based on the embodiment in the application, those of ordinary skill in the art are not making the every other embodiment obtaining under creative work prerequisite, all belong to the scope of the application's protection.
Claims (6)
1. a power unit module for power electronics converter, is characterized in that, described power unit module comprises T shape power submodule, DC capacitor and current limiting reactor; Three branch roads of described T shape power submodule are provided with full-control type device group; Described DC capacitor is connected in parallel on horizontal branches two ends; Described current limiting reactor is connected in parallel on the two ends of the full-control type device group on vertical branch road.
2. the power unit module of a kind of power electronics converter as claimed in claim 1, is characterized in that, described full-control type device group comprises the power electronic device being connected in series; Described power electronic device adopts any one in IGBT, IGCT and GTO.
3. the power unit module of a kind of power electronics converter as claimed in claim 2, is characterized in that, diode of reverse parallel connection between the collector and emitter of described power electronic device.
4. the power unit module of a kind of power electronics converter as claimed in claim 1, is characterized in that, the full-control type device group in described T shape power submodule in horizontal branches arranges in the same way; The full-control type device group of described vertical branch road is connected with the tie point of described horizontal branches by power electronic device collector electrode.
5. the power unit module of a kind of power electronics converter as claimed in claim 1, it is characterized in that, when described power unit module series connection, be connected successively with the power electronic device emitter of horizontal branches in another T shape power submodule by the power electronic device emitter of vertical branch road in T shape power submodule.
6. the power unit module of a kind of power electronics converter as claimed in claim 1, it is characterized in that a by-pass switch in parallel between the horizontal branches by power electronic device collector electrode vertical connecting branch road in described T shape power submodule and described vertical branch road.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420282327.8U CN203859676U (en) | 2014-05-29 | 2014-05-29 | Power unit module of power electronic converter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420282327.8U CN203859676U (en) | 2014-05-29 | 2014-05-29 | Power unit module of power electronic converter |
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|---|---|
| CN203859676U true CN203859676U (en) | 2014-10-01 |
Family
ID=51609511
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104617800A (en) * | 2015-01-30 | 2015-05-13 | 天津大学 | Improved redundancy type MMC current converter structure having direct-current fault current-limiting capacity |
| CN107370393A (en) * | 2017-06-29 | 2017-11-21 | 全球能源互联网研究院 | A kind of Modularized multi-level converter sub-module topological structure and its guard method |
| CN107732887A (en) * | 2017-10-10 | 2018-02-23 | 许继电气股份有限公司 | A kind of damping module based on switching device series connection |
| CN112910237A (en) * | 2021-03-09 | 2021-06-04 | 国家电网有限公司 | Current conversion chain, current converter and fault clearing method |
-
2014
- 2014-05-29 CN CN201420282327.8U patent/CN203859676U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104617800A (en) * | 2015-01-30 | 2015-05-13 | 天津大学 | Improved redundancy type MMC current converter structure having direct-current fault current-limiting capacity |
| CN107370393A (en) * | 2017-06-29 | 2017-11-21 | 全球能源互联网研究院 | A kind of Modularized multi-level converter sub-module topological structure and its guard method |
| CN107732887A (en) * | 2017-10-10 | 2018-02-23 | 许继电气股份有限公司 | A kind of damping module based on switching device series connection |
| CN112910237A (en) * | 2021-03-09 | 2021-06-04 | 国家电网有限公司 | Current conversion chain, current converter and fault clearing method |
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