CN203166541U - Unified power flow controller adopting modular structure - Google Patents
Unified power flow controller adopting modular structure Download PDFInfo
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- CN203166541U CN203166541U CN 201320185283 CN201320185283U CN203166541U CN 203166541 U CN203166541 U CN 203166541U CN 201320185283 CN201320185283 CN 201320185283 CN 201320185283 U CN201320185283 U CN 201320185283U CN 203166541 U CN203166541 U CN 203166541U
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- converter
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- upfc
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- brachium pontis
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- 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]
Abstract
The utility model relates to the technical field of power electronics and discloses a unified power flow controller adopting a modular structure. The unified power flow controller comprises a converter I, a converter II, a transformer I and a transformer II, wherein one end of the converter I is connected in parallel into a power grid after being connected with the transformer I, the other end of the converter I is connected with the converter II through positive and negative electrode buses, the other end of the converter II is connected in series into the power grid through the transformer II, the converter I and the converter II are three-single-phase-bridge modular converters, each three-single-phase-bridge modular converter is composed of 12 bridge arms in three phases, and three-phase outputs of the converters are connected to a three-phase bus of the power grid after being connected with independent transformers of converter-side windings of the corresponding phases. The direct voltage of the unified power flow controller is reduced by one time, the unified power flow controller has the capability of individual phase control, and a power electronic bypass switch at a series side of the unified power flow controller can improve safety of the device and reduce the requirement on a converter switching device.
Description
Technical field
The utility model belongs to electric and electronic technical field, is specifically related to adopt the THE UPFC of modular construction.
Background technology
(unified power flow controller UPFC) is based on the series and parallel mixed type FACTS device of voltage source converter to THE UPFC, can carry out Flexible Control to a plurality of electric parameters, is the effective means that improves the electrical network controllability.After being suggested, the UPFC concept causes the upsurge of one research and application immediately, 3 engineerings in succession abroad put into operation, all continued early stage ac transmission (flexible AC transmission system flexibly, what FACTS) generally adopted in the field is topological by multipleization that transformer carries out the phase shift stack with three-phase square wave type voltage source converter unit, adopts the series connection of GTO device and diode clamp type three level converter technology simultaneously.Switching device series connection, three level, multiple technology combine and can significantly promote capacity and the electric pressure of converter, can improve waveform quality again, and be very suitable to the big capacity full-controlled switch device at a slow speed that adopts the fundamental frequency square-wave frequency modulation.But the use of too much tortuous transformer causes that the converter overall structure is lengthy and jumbled, magnetic circuit is complicated, and economy and reliability reduce, simultaneously, based on the multiple inverter configuration of fundamental frequency heap ripple can give full play to IGBT device high frequency fast the characteristics of response be still waiting to inquire into.
In order to be complementary with power transmission network voltage, power grade, must adopt an effective measure and improve UPFC converter capacity, many level and switching device series connection are 2 kinds of main modes that present high-power voltage source converter adopts.Consider problems such as moving static state voltage equipoise that device series connection causes, harmonic wave, voltage change ratio, and the blockade of the crimp type IGBT of ABB and serial connection technology thereof, novel voltage with multiple levels source converter receives increasing concern.Press the difference of circuit structure form, multilevel converter can be divided into clamper type many level structure and modular multilevel structure.The circuit complexity of clamper type multilevel converter sharply increases with the increase of level number, generally is no more than three level during actual big capacity applications, and development bottleneck still is the device serial connection technology.And modularization multi-level converter (modular multilevel converter, MMC) broken through the mentality of designing of traditional electrical potential source converter, dc capacitor is disperseed to be installed in each submodule, the mode that adopts module directly to connect, generate many level alternating voltage by a plurality of little level value stacks, power grade changes flexibly.In recent years, MMC has obtained practice and development in the flexible DC power transmission field, also selects to provide new scheme for the topological structure of UPFC.
The utility model content
At the deficiencies in the prior art, the utility model proposes a kind of THE UPFC that adopts modular construction, can realize phase-splitting control, protection and operation, strengthen THE UPFC to the adaptability of electrical network abnormality.
A kind of THE UPFC that adopts modular construction that the utility model provides comprises converter I, converter II, transformer I and transformer II; Described converter I one end be connected to the grid after described transformer I is connected, the other end is connected with described converter II by the both positive and negative polarity bus; The other end of described converter II seals in electrical network by described transformer II; Its improvements are, the structure of described converter I and described converter II is three single-phase bridge modularization converters, it is made of 12 brachium pontis of three-phase, and converter three-phase output and each phase converter side winding independently transformer are connected the three-phase bus of access electrical network afterwards.
Wherein, 12 brachium pontis of described three-phase, every 4 brachium pontis, two last brachium pontis and two following brachium pontis of comprising mutually;
Each brachium pontis comprises 1 reactor and N the submodule that structure is identical, and an end is connected with transformer by reactor after N the sub-module cascade, and the other end is connected with submodule one end of the cascade of equidirectional brachium pontis, forms the both positive and negative polarity bus.
Wherein, described THE UPFC comprises start-up circuit I, start-up circuit II;
Described start-up circuit I is arranged on the described positive electrode bus; Described start-up circuit II is arranged on the described negative pole bus.Current limliting when start-up circuit is used for device and starts is made of the by-pass switch of resistance and two ends parallel connection thereof.
Wherein, described THE UPFC comprises the power electronics by-pass switch; Described power electronics by-pass switch is arranged between described converter II and the described transformer II.
Wherein, described power electronics by-pass switch comprises 3 groups of thyristor switchs, connects three phase transmission line respectively;
Every group of thyristor switch comprises antiparallel thyristor.
Wherein, described power electronics by-pass switch adopts star-like or delta connection mode.
Wherein, other (machinery) by-pass switch that is equipped with of the winding of each the phase system side of transformer that is connected with described converter II; Described by-pass switch and transformers connected in parallel.
Wherein, described transformer II all adopts the star-like mode of connection of opening at converter side winding and system side winding.
Wherein, described transformer I adopts the star-like mode of connection of opening at converter side winding, adopts the star-like mode of connection at the system side winding, and neutral ground; Perhaps
Described transformer I adopts the star-like mode of connection of opening at converter side winding, adopts the triangular form mode of connection and is provided with for the triangle tertiary winding of isolating zero-sequence component, tertiary winding ground connection at the system side winding;
Wherein, described THE UPFC comprises the start-up circuit III that is arranged between electrical network and the described transformer I.
Wherein, described submodule constitutes by half-bridge structure is in parallel with dc capacitor, and described half-bridge structure comprises the IGBT module of two series connection, and each IGBT module comprises antiparallel IGBT and diode; Draw collector electrode/emitter of half-bridge structure mid point and IGBT as input and the output of submodule.
Wherein, described start-up circuit I and described start-up circuit II include parallel resistor and switch; Described start-up circuit III comprises parallel resistor and switch.
Compared with the prior art, the beneficial effects of the utility model are:
The utility model is compared with the traditional modular multilevel converter, exports identical alternating voltage, and direct voltage can reduce half.
The utility model can be realized phase-splitting control, protection and operation, strengthens THE UPFC to the adaptability of electrical network abnormality.
The utility model possesses the quick bypass capability that installs after the fault, improves device and system safety.
Topological structure of the present utility model has reduced number of modules, is conducive to Pressure and Control.
Description of drawings
Fig. 1 is the novel THE UPFC converter schematic diagram of the employing modular construction that provides of the utility model.
Fig. 2 is the single-phase schematic diagram of three uniphase mode blocking multilevel converters that the utility model provides.
Fig. 3 is the structural representation of 4 brachium pontis that are connected with electrical network A phase power transmission line of providing of the utility model.
Fig. 4 is a kind of feasible configurations schematic diagram of THE UPFC side transformer in parallel that the utility model provides.
Fig. 5 is a kind of feasible configurations schematic diagram of THE UPFC series connection side transformer that the utility model provides.
Fig. 6 is the series connection side power electronics by-pass switch structural representation that the utility model provides.
Fig. 7 is a kind of single-phase feasible configurations schematic diagram of the series connection side power electronics by-pass switch that provides of the utility model.
Embodiment
The novel THE UPFC of the employing three single-phase bridge modularization multi-level converters that present embodiment proposes, its structure comprises shown in 2 among the converter I(figure as shown in Figure 1), shown in 9 among the converter II(figure), shown in 5 among the transformer I(figure) and transformer II(figure in 6 shown in); Converter I one end be connected to the grid after transformer I is connected, the other end is connected with converter II by the both positive and negative polarity bus; The other end of converter II seals in electrical network by transformer II; And the converter I of present embodiment and the structure of converter II are three single-phase bridge modularization converters, and it is made of 12 brachium pontis of three-phase, and three-phase is connected the three-phase bus that electrical network is inserted in the back respectively with three transformers.
The series and parallel side three single-phase bridge modularization multi-level converter structures that constitute connected mode back-to-back by direct current current-limiting resistance as shown in Figure 2.Because series and parallel side converter structure is identical, all comprises three single-phase bridges, whole THE UPFC comprises 6 single-phase bridges.Among the figure, anodal AP1, the AP2 of 6 single-phase bridges, BP1, BP2, CP1, CP2 link to each other, and constitute the direct-flow positive pole of THE UPFC; Negative pole AN1, the AN2 of 6 single-phase bridges, BN1, BN2, CN1, CN2 link to each other, and constitute the direct current negative pole of THE UPFC; The interchange output A of three single-phase bridges of side in parallel
1-sh, A
2-sh, B
1-sh, B
2-sh, C
1-sh, C
2-shThe A that connects the converter side winding of transformer I shown in Figure 4
1-sh, A
2-sh, B
1-sh, B
2-sh, C
1-sh, C
2-shEnd; The interchange output A of three single-phase bridges of series connection side
1-se, A
2-se, B
1-se, B
2-se, C
1-se, C
2-seThe A that connects the converter side winding of the transformer II shown in the accompanying drawing 5
1-se, A
2-se, B
1-se, B
2-se, C
1-se, C
2-seEnd; Anodal AP1, BP1, the CP1 of 3 single-phase bridges of THE UPFC side in parallel directly link to each other, anodal AP2, BP2, the CP2 of 3 single-phase bridges of series connection side directly link to each other, and the public terminal of series and parallel side single-phase bridge positive pole connects by direct-flow positive pole starting resistance RDC1 and by-pass switch BRKDC1 in parallel thereof; Negative pole AN1, BN1, the CN1 of 3 single-phase bridges of THE UPFC side in parallel directly link to each other, negative pole AN2, BN2, the CN2 of 3 single-phase bridges of series connection side directly link to each other, and the public terminal of series and parallel side single-phase bridge negative pole connects by direct current negative pole starting resistance RDC2 and by-pass switch BRKDC2 in parallel thereof.
The converter side winding two ends of transformer II power electronics by-pass switch in parallel, line side winding parallel manipulator by-pass switch.Two cover shunting devices cooperatively interact, and utilize the rapid Motor ability of power electronics by-pass switch, shift fault current, avoid that switching device bears super-high-current stress in the three single-phase bridge modularization converters.
Constitute the single-phase bridge structure of three single-phase bridge modularization multi-level converters as shown in Figure 3, this single-phase bridge is respectively 4 brachium pontis of 1,2,3,4 by label and constitutes, and wherein brachium pontis 1 and brachium pontis 3 are equidirectional brachium pontis, are last brachium pontis, brachium pontis 2 and brachium pontis 4 are equidirectional brachium pontis, are following brachium pontis.Each brachium pontis comprises 1 reactor and N the submodule that structure is identical, and an end is connected with transformer by reactor after N the sub-module cascade, and the other end is connected with submodule one end of the cascade of equidirectional brachium pontis, forms the both positive and negative polarity bus.Submodule constitutes by half-bridge structure is in parallel with dc capacitor, and described half-bridge structure comprises the IGBT module of two series connection, and each IGBT module comprises antiparallel IGBT and diode; Therefore draw collector electrode/emitter of half-bridge structure mid point and IGBT as input and the output of submodule, three single-phase bridge modularization converters are every comprises two ac output ends mutually.Upper and lower brachium pontis to two ac output end correspondences of each phase of three single-phase bridge modularization converters is suitably controlled, and the output voltage amplitude between two ac output ends can reach two times of single interchange end output voltage.Under the condition that does not increase direct voltage, enlarge markedly ac output voltage thus.For example, brachium pontis 1, brachium pontis 4 are adopted the identical triggering mode, simultaneously brachium pontis 2, brachium pontis 3 are adopted the identical triggering mode, then the voltage between single-phase bridge ac terminal A1, A2 is the twice of the neutral point of A1 or A2 voltage to neutral.
The winding connection form of transformer I as shown in Figure 4, the system side winding adopts the YN type mode of connection, terminal A
H-sh, B
H-sh, C
H-shBe connected to high voltage startup resistance III and by-pass switch thereof, and then by the high-voltage switch gear THE UPFC place substation bus bar that inserts in parallel.The low-pressure side winding adopts opening star-like, links to each other with converter I ac output end.
The winding connection form of transformer II as shown in Figure 5, the system side winding adopts the star-like mode of connection of opening, terminal A
1H-se, A
2H-se, B
1H-se, B
2H-se, C
1H-se, C
2H-sePhase-splitting inserts three phase line.The low-pressure side winding adopts opening star-like, links to each other with converter II ac output end.
The power electronics by-pass switch mode of connection can adopt star-like or the delta connection mode as shown in Figure 6.The every phase of switch can be made of two antiparallel thyristor valves, as T1, the T2 of A phase, in the positive and negative half-wave alternate conduction of electric current.The mode that the implementation of thyristor valve T1, T2, T3, T4, T5, T6 can be taked as shown in Figure 7, by several antiparallel thyristors to and buffer circuit connect to improve electric pressure, and then connect with current-limiting reactor.Anti-parallel thyristor pair is realized overvoltage protection with after reactance is connected at its two ends lightning arrester connected in parallel.
Current limliting when present embodiment start-up circuit described above is used for the device startup is by the by-pass switch formation of resistance and two ends parallel connection thereof.
Should be noted that at last: above embodiment is only in order to illustrate that the technical solution of the utility model is not intended to limit, although with reference to above-described embodiment the utility model is had been described in detail, those of ordinary skill in the field are to be understood that: still can make amendment or be equal to replacement embodiment of the present utility model, and do not break away from any modification of the utility model spirit and scope or be equal to replacement, it all should be encompassed in the middle of the claim scope of the present utility model.
Claims (11)
1. a THE UPFC that adopts modular construction comprises converter I, converter II, transformer I and transformer II; Described converter I one end be connected to the grid after described transformer I is connected, the other end is connected with described converter II by the both positive and negative polarity bus; The other end of described converter II seals in electrical network by described transformer II; It is characterized in that,
The structure of described converter I and described converter II is three single-phase bridge modularization converters, and it is made of 12 brachium pontis of three-phase, and converter three-phase output and each phase converter side winding independently transformer are connected the three-phase bus of access electrical network afterwards.
2. THE UPFC as claimed in claim 1 is characterized in that, 12 brachium pontis of described three-phase, every 4 brachium pontis, two last brachium pontis and two following brachium pontis of comprising mutually;
Each brachium pontis comprises 1 reactor and N the submodule that structure is identical, and an end is connected with transformer by reactor after N the sub-module cascade, and the other end is connected with submodule one end of the cascade of equidirectional brachium pontis, forms the both positive and negative polarity bus.
3. THE UPFC as claimed in claim 1 is characterized in that, described THE UPFC comprises start-up circuit I, start-up circuit II;
Described start-up circuit I is arranged on the described positive electrode bus; Described start-up circuit II is arranged on the described negative pole bus.
4. THE UPFC as claimed in claim 1 is characterized in that, described THE UPFC comprises the power electronics by-pass switch; Described power electronics by-pass switch is arranged between described converter II and the described transformer II.
5. THE UPFC as claimed in claim 4 is characterized in that, described power electronics by-pass switch comprises 3 groups of thyristor switchs, connects three phase transmission line respectively;
Every group of thyristor switch comprises antiparallel thyristor.
6. THE UPFC as claimed in claim 5 is characterized in that, described power electronics by-pass switch adopts star-like or delta connection mode.
7. THE UPFC as claimed in claim 1 is characterized in that, the other by-pass switch that is equipped with of the winding of each the phase system side of transformer that is connected with described converter II; Described by-pass switch and transformers connected in parallel.
8. as claim 4 or 7 described THE UPFC, it is characterized in that described transformer II all adopts the star-like mode of connection of opening at converter side winding and system side winding.
9. THE UPFC as claimed in claim 1 is characterized in that, described transformer I adopts the star-like mode of connection of opening at converter side winding, adopts the star-like mode of connection at the system side winding, and neutral ground; Perhaps
Described transformer I adopts the star-like mode of connection of opening at converter side winding, adopts the triangular form mode of connection and is provided with for the triangle tertiary winding of isolating zero-sequence component, tertiary winding ground connection at the system side winding.
10. THE UPFC as claimed in claim 1 is characterized in that, described THE UPFC comprises the start-up circuit III that is arranged between electrical network and the described transformer I.
11. THE UPFC as claimed in claim 2 is characterized in that, described submodule constitutes by half-bridge structure is in parallel with dc capacitor, and described half-bridge structure comprises the IGBT module of two series connection, and each IGBT module comprises antiparallel IGBT and diode;
Draw collector electrode/emitter of half-bridge structure mid point and IGBT as input and the output of submodule.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320185283 CN203166541U (en) | 2013-04-12 | 2013-04-12 | Unified power flow controller adopting modular structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320185283 CN203166541U (en) | 2013-04-12 | 2013-04-12 | Unified power flow controller adopting modular structure |
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| CN203166541U true CN203166541U (en) | 2013-08-28 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103236710A (en) * | 2013-04-12 | 2013-08-07 | 国家电网公司 | Unified power flow controller in modular structure |
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2013
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103236710A (en) * | 2013-04-12 | 2013-08-07 | 国家电网公司 | Unified power flow controller in modular structure |
| CN103236710B (en) * | 2013-04-12 | 2016-05-25 | 国家电网公司 | Adopt the THE UPFC of modular construction |
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| GR01 | Patent grant | ||
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| CX01 | Expiry of patent term |
Granted publication date: 20130828 |