CN203026952U - Star chain-type STATCOM (static synchronous compensator) device with unbalanced current compensation function - Google Patents
Star chain-type STATCOM (static synchronous compensator) device with unbalanced current compensation function Download PDFInfo
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- CN203026952U CN203026952U CN2012206747965U CN201220674796U CN203026952U CN 203026952 U CN203026952 U CN 203026952U CN 2012206747965 U CN2012206747965 U CN 2012206747965U CN 201220674796 U CN201220674796 U CN 201220674796U CN 203026952 U CN203026952 U CN 203026952U
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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
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/10—Flexible AC transmission systems [FACTS]
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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
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks
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Abstract
The utility model discloses a star chain-type STATCOM (static synchronous compensator) device with an unbalanced current compensation function in the technical field of alternating current distribution. The star chain-type STATCOM device comprises a chain-type tri-single-phase bridge, a connecting electric reactor and a three-phase grounding transformer, wherein one end of the connecting electric reactor is connected with a power grid system and the three-phase grounding transformer respectively; the other end of the connecting electric reactor is connected with the output end of the chain-type tri-single-phase bridge; a neutral point of the three-phase grounding transformer is connected with the neutral point of the chain-type tri-single-phase bridge; the chain-type tri-single-phase bridge comprises three chain-type bridge arms of which the neutral points are connected; the output end of each chain-type bridge arm is connected with the connecting electric reactor; and each chain-type bridge arm comprises a plurality of cascaded power units; and single-phase current converters are used as the power units. By adopting the star chain-type STATCOM device, a main circuit structure is changed by additionally arranging the grounding transformer; and compensation on an unbalanced current by the star chain-type STATCOM is achieved under the situation of not increasing the direct current voltage level.
Description
Technical field
The utility model relates to a kind of device of AC distribution technical field, specifically a kind of star chain link formula STATCOM device with unsymmetrical current compensate function.
Background technology
STATCOM(Static Synchronous Compensator, STATCOM) also referred to as SVG(Static VarGenerator, static reacance generator), be a kind of novel power electronic equipment, be widely used in the reactive power compensation in metallurgy, wind energy turbine set and electrical network.STATCOM adopts the power electronic device of the full-control types such as IGBT, can inject continuous capacitive or perceptual idle to electrical network rapidly by target setting, thereby play the effect of controlling idle and stable line voltage.
The main circuit of chain type STATCOM has two kinds of connected modes, and star connects mode and corner connection mode.Under identical grade of rated voltage, with respect to corner connection STATCOM, it is few that star connects the required power model quantity of STATCOM, controls simply, and good reliability is widely used in Practical Project.Due to the restriction of direct voltage, star meets STATCOM and be difficult to realize the unbalance load compensation function in engineering is used.If chain type STATCOM needs the compensation unsymmetrical current at present, generally adopt corner connection mode or star to connect the mode that STATCOM adds triangle/Star Type Transformer.But the device that during corner connection, the same electric pressure of access needs cascade than star connect many, reliability reduces, and controls complexity and improves; The mode that increases transformer has had more extra cost, occupation of land and running wastage etc.
Find through the retrieval to prior art, Chinese patent literature CN102044879, an open day 2011-5-4 put down in writing a kind of packaged type STATCOM of modular structure, and a basic change of current and the operation unit that is used for that the auxiliary equipment of the change of current forms together consist of change of current module.But the prior art does not disclose method or the device of STATCOM compensation unsymmetrical current.
The utility model content
The utility model proposes a kind of star chain link formula STATCOM device with unsymmetrical current compensate function for the prior art above shortcomings, realizes the unsymmetrical current compensation.
The utility model is achieved through the following technical solutions, the utility model comprises: chain type three single-phase bridges, connection reactance and three-phase ground transformer, wherein: an end that connects reactance is connected with the three-phase ground transformer with network system respectively, the other end is connected with the output of chain type three single-phase bridges, and the neutral point of three-phase ground transformer is connected with the neutral point of chain type three single-phase bridges.
Described chain type three single-phase bridges comprise: the chain type brachium pontis that three neutral points are connected, the output of each chain type brachium pontis is with to be connected reactance connected.
Described chain type brachium pontis comprises: the power cell of some cascades.
Described power cell is single-phase inverters.
Described power cell is single-phase H bridge inverter or single-phase three-level inverter.
Described three-phase ground transformer is the Z-type transformer.
The capacity of described three-phase ground transformer is 10kV/300A.
The utility model has changed main circuit structure by increasing grounding transformer, realizes that star chain link formula STATCOM is to the compensation of unsymmetrical current in the situation that do not increase DC voltage.
Description of drawings
Fig. 1 is the utility model connection diagram.
Fig. 2 is the utility model and network system connection diagram.
Fig. 3 is the compensation effect figure of the utility model and network system;
In figure: (a) for Usab/Usbc/Usca be the three-phase line voltage schematic diagram of network system, (b) be the three-phase load current diagram of Ila/Ilb/Ilc for load, (c) for Isvga/Isvgb/Isvgc be the three-phase output current schematic diagram of the present embodiment, (d) for Isa/Isb/Isc being the three-phase current schematic diagram of network system, is (e) three-phase current schematic diagram in three-phase ground transformer 3 for Ignda/Igndb/Igndc.
Embodiment
The below elaborates to embodiment of the present utility model; the present embodiment is implemented under take technical solutions of the utility model as prerequisite; provided detailed execution mode and concrete operating process, but protection range of the present utility model is not limited to following embodiment.
As shown in Figure 1, the present embodiment comprises: chain type three single-phase bridges 1, connection reactance 2 and three-phase ground transformer 3, wherein: an end that connects reactance 2 is connected with three-phase ground transformer 3 with the outside electric power network system respectively, the other end is connected with the output of chain type three single-phase bridges 1, and the neutral point of three-phase ground transformer 3 is connected with the neutral point of chain type three single-phase bridges 1.
Described chain type three single-phase bridges 1 comprise: the chain type brachium pontis that three neutral points are connected, the output of each chain type brachium pontis is with to be connected reactance 2 connected.
Described chain type brachium pontis comprises: the power cell of some cascades.
Described power cell is single-phase inverters.
Described power cell is single-phase H bridge inverter or single-phase three-level inverter.
Described three-phase ground transformer 3 is the Z-type transformer.This transformer is usually used in earth point of structure in isolated neutral system.It is anti-phase on this phase magnetic post that every phase coil of this transformer is divided into two windings, very little to zero sequence impedance, and very large to positive sequence and negative sequence impedance.The capacity of this transformer can be selected according to the negative-sequence current size of required compensation.
As shown in Figure 2, the capacity of the present embodiment is 6MVar, and three-phase ground transformer 3 capacity are 10kV/300A, and the neutral point of grounding transformer is connected with the neutral point of chain type three single-phase bridges 1.The network system electric pressure is 10kV, and load current is uneven, wherein comprises reactive current 100A, negative-sequence current 80A, and the present embodiment is the STATCOM input compensation in the time of 0.2 second.
The present embodiment compensation effect as shown in Figure 3, wherein: Fig. 3 (a) is the three-phase line voltage of network system for Usab/Usbc/Usca, Fig. 3 (b) is the three-phase load electric current of Ila/Ilb/Ilc for load, Fig. 3 (c) is the three-phase output current of the present embodiment for Isvga/Isvgb/Isvgc, Fig. 3 (d) is the three-phase current of network system for Isa/Isb/Isc, and Fig. 3 (e) is three-phase current in three-phase ground transformer 3 for Ignda/Igndb/Igndc.As we can see from the figure, before the STATCOM input compensation, the idle and negative-sequence current that comprises in load current flows into system, causes system power also uneven; After 0.2 second STATCOM input compensation, due to the idle and negative-sequence current full remuneration of STATCOM output load current, therefore make idle and negative-sequence current in system power all close to zero, the compensation effect ideal.The zero-sequence current that comprises in the STATCOM output current forms path through grounding transformer, thereby makes STATCOM normally to export idle and negative-sequence current.
Claims (7)
1. star chain link formula STATCOM device with unsymmetrical current compensate function, it is characterized in that, comprise: chain type three single-phase bridges, connection reactance and three-phase ground transformer, wherein: an end that connects reactance is connected with the three-phase ground transformer with network system respectively, the other end is connected with the output of chain type three single-phase bridges, and the neutral point of three-phase ground transformer is connected with the neutral point of chain type three single-phase bridges.
2. the star chain link formula STATCOM device with unsymmetrical current compensate function according to claim 1, is characterized in that, described chain type three single-phase bridges comprise: the chain type brachium pontis that three neutral points are connected, the output of each chain type brachium pontis is with to be connected reactance connected.
3. the star chain link formula STATCOM device with unsymmetrical current compensate function according to claim 2, is characterized in that, described chain type brachium pontis comprises: the power cell of some cascades.
4. the star chain link formula STATCOM device with unsymmetrical current compensate function according to claim 3, is characterized in that, described power cell is single-phase inverters.
5. the star chain link formula STATCOM device with unsymmetrical current compensate function according to claim 3, is characterized in that, described power cell is single-phase H bridge inverter or single-phase three-level inverter.
6. the star chain link formula STATCOM device with unsymmetrical current compensate function according to claim 1, is characterized in that, described three-phase ground transformer is the Z-type transformer.
7. the star chain link formula STATCOM device with unsymmetrical current compensate function according to claim 6, is characterized in that, the capacity of described three-phase ground transformer is 10kV/300A.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012206747965U CN203026952U (en) | 2012-12-07 | 2012-12-07 | Star chain-type STATCOM (static synchronous compensator) device with unbalanced current compensation function |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012206747965U CN203026952U (en) | 2012-12-07 | 2012-12-07 | Star chain-type STATCOM (static synchronous compensator) device with unbalanced current compensation function |
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| CN203026952U true CN203026952U (en) | 2013-06-26 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103326366A (en) * | 2013-06-28 | 2013-09-25 | 中国西电电气股份有限公司 | Three-single-phase-three-wire-system parallel APF/SVG device |
| CN107294114A (en) * | 2017-07-21 | 2017-10-24 | 国网湖南省电力公司 | SVG universal control methods under a kind of multiple topology based on phse conversion |
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2012
- 2012-12-07 CN CN2012206747965U patent/CN203026952U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103326366A (en) * | 2013-06-28 | 2013-09-25 | 中国西电电气股份有限公司 | Three-single-phase-three-wire-system parallel APF/SVG device |
| CN107294114A (en) * | 2017-07-21 | 2017-10-24 | 国网湖南省电力公司 | SVG universal control methods under a kind of multiple topology based on phse conversion |
| CN107294114B (en) * | 2017-07-21 | 2019-12-27 | 国网湖南省电力公司 | SVG (scalable vector graphics) general control method based on phase transformation under multi-topology structure |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130626 Termination date: 20211207 |