CN203800619U - Grid-connected connection circuit for three-phase energy storage current transformer - Google Patents
Grid-connected connection circuit for three-phase energy storage current transformer Download PDFInfo
- Publication number
- CN203800619U CN203800619U CN201420234361.8U CN201420234361U CN203800619U CN 203800619 U CN203800619 U CN 203800619U CN 201420234361 U CN201420234361 U CN 201420234361U CN 203800619 U CN203800619 U CN 203800619U
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- current transformer
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- 238000004146 energy storage Methods 0.000 title abstract description 4
- 238000002955 isolation Methods 0.000 claims abstract description 29
- 238000009825 accumulation Methods 0.000 claims description 19
- 238000005516 engineering process Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000009415 formwork Methods 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
Classifications
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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
- Y02E40/40—Arrangements for reducing harmonics
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Abstract
The utility model relates to a grid-connected connection circuit for a three-phase energy storage current transformer. The grid-connected connection circuit comprises a three-phase energy storage current transformer inversion circuit, a three-phase isolation transformer, a central line controllable isolation switch, a three-phase AC contactor and a three-phase AC breaker. The grid-connected connection circuit is characterized by an inverter output D/Yn type three-phase isolation transformer and the central line controllable isolation switch, and an original edge realizes triangle connection, a secondary edge realizes star-shaped connection with a central line. By controlling operation states of the central line controllable isolation switch during grid connection or grid disconnection of the current transformer, an inverter grid connected harmonic wave current is inhibited, and efficiency and reliability of the system are improved; when an electrical network is in fault, the current transformer is made to work in the disconnection operation state and has capability of taking a non-balance load and a single-phase load, and stable electrical energy is provided for a local load.
Description
Technical field
The utility model relates to a kind of grid-connected connecting circuit of current transformer, relates in particular to a kind of grid-connected connecting circuit of three-phase energy accumulation current converter.Be applicable to the current transformer that uses D/Yn type (connection of former limit triangle, secondary Y-connection band center line) three-phase isolation transformer to be connected with electrical network.
Background technology
Along with applying of the technology such as wind-powered electricity generation, photovoltaic, be badly in need of the two way convertor that a kind of and this batch (-type) distribution energy is used in conjunction with.The specification requirement of this two way convertor is, while matching with power network dispatching system, can realize the peak load shifting to network load; While coordinating with batch (-type) distributed energy, can stabilize the fluctuation of the batch (-type) energy; Meanwhile, can be rapidly for sensitive loads provides supply of electric power when large electric network fault, thus guarantee the power supply reliability of important load.
Traditional battery energy storage device adopts 3-phase power converter to realize, and with four-wire system form, is directly connected with electrical network.Current transformer output isolation transformer is when high-power applications, and inversion side (former limit) often adopts triangle connected mode with harmonic reduction, but when the grid-connected application of reality, center line harmonic current is very large, has reduced system effectiveness and reliability.
Utility model content
For the large defect of the grid-connected isolating transformer center line of D/Yn type harmonic current in energy accumulation current converter, provide a kind of grid-connected connecting circuit that is applicable to three-phase energy accumulation current converter.
The grid-connected connecting circuit that a kind of three-phase energy accumulation current converter is provided in order to overcome the above problems the utility model, is characterized in that:
Comprise three-phase energy accumulation current converter inverter circuit, three-phase isolation transformer, the controlled isolating switch of center line, three-phase ac contactor, three-phase alternating current circuit breaker;
Three-phase energy accumulation current converter inverter circuit is connected with the former limit of three-phase isolation transformer; The secondary three-phase output of three-phase isolation transformer is connected with three phase network and local load with AC circuit breaker through A.C. contactor successively
;the secondary center line output of three-phase isolation transformer is connected with three phase network center line and local load by the controlled isolating switch of center line.Described three-phase isolation transformer, except adjusting voltage and electrical isolation effect, also makes current transformer can connect independently single-phase load.
Described three-phase isolation transformer adopts D/Yn type, i.e. former limit triangle connection, secondary Y-connection band center line.
The controlled isolating switch of described center line is controlled A.C. contactor.
The utility model has designed a kind of grid-connected connecting circuit that reduces grid-connected harmonic current.When energy accumulation current converter is operated in grid-connected pattern, controlling the controlled isolating switch of center line disconnects, three-phase isolation transformer with the former limit of D/Y(triangle connect, secondary Y-connection is with center line) form grid-connected, cut off three phase network third harmonic voltage and by D/Y transformer, produced the path of harmonic current.When energy accumulation current converter is operated in from net pattern, control the controlled isolating switch of center line closed, three-phase isolation transformer connects three phase network and local load with D/Yn type, current path is provided to local three-phase imbalance load and single-phase load.Take full advantage of that D/Y type transformer is incorporated into the power networks in large-power occasions that output current harmonics content is low, D/Yn type transformer is low and have advantages of the unbalanced load of being with ability from network operation harmonic wave of output voltage content.
The utility model core is inverter output D/Yn type three-phase isolation transformer (connection of former limit triangle, secondary Y-connection band center line), the controlled isolating switch of center line.By controlling the controlled isolating switch of center line and state during from network operation grid-connected at current transformer, realize the inhibition to grid-connected inverters harmonic current, improve system effectiveness and reliability; When electric network fault, current transformer is operated in from Running State, there is the ability with unbalanced load and single-phase load, for local load provides stable electric energy.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the utility model system.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described in further detail.
As shown in Figure 1, the utility model provides a kind of grid-connected connecting circuit of three-phase energy accumulation current converter, comprises three-phase energy accumulation current converter inverter circuit, three-phase isolation transformer T1, center line A.C. contactor K3, A.C. contactor K1, AC circuit breaker K2;
Three-phase energy accumulation current converter inverter circuit is connected with the former limit (triangle is connected) of D/Yn type three-phase isolation transformer T1; Secondary (Y-connection band center line) three-phase output of three-phase isolation transformer is connected with three phase network and load with AC circuit breaker K2 through A.C. contactor K1 successively;
The secondary center line output of three-phase isolation transformer T1 is connected with three phase network center line and local load by center line A.C. contactor K3
.when energy accumulation current converter is operated in grid-connected pattern, center line A.C. contactor K3 is disconnected, three-phase isolation transformer T1 is grid-connected with the form of D/Y, has cut off Triple-Frequency Harmonic in Power System voltage and by D/Y three-phase isolation transformer T1, has produced the path of harmonic current.When energy accumulation current converter is operated in from net pattern, center line A.C. contactor K3 is closed, and three-phase isolation transformer T1, with the form work of D/Yn, provides path to local three-phase imbalance load and single-phase load electric current.Take full advantage of that D/Y type transformer is incorporated into the power networks in large-power occasions that output current harmonics content is little, D/Yn type transformer is little and have advantages of the unbalanced load of being with ability from network operation harmonic wave of output voltage content, empirical tests is respond well.
The foregoing is only preferred embodiment of the present utility model, be not restricted to the utility model, for a person skilled in the art, the utility model can have various modifications and variations.All within spirit of the present utility model and principle, any modification of doing, be equal to replacement, improvement etc., within all should being included in claim scope of the present utility model.
Claims (3)
1. a grid-connected connecting circuit for three-phase energy accumulation current converter, is characterized in that: comprise three-phase energy accumulation current converter inverter circuit, three-phase isolation transformer, the controlled isolating switch of center line, three-phase ac contactor, three-phase alternating current circuit breaker;
Three-phase energy accumulation current converter inverter circuit is connected with the former limit of three-phase isolation transformer; The secondary three-phase output of three-phase isolation transformer is connected with three phase network and load with AC circuit breaker through A.C. contactor successively; The secondary center line output of three-phase isolation transformer is connected with three phase network center line and local load by controlled isolating switch
.
2. the grid-connected connecting circuit of a kind of three-phase energy accumulation current converter according to claim 1, is characterized in that: described three-phase isolation transformer adopts D/Yn type, i.e. former limit triangle connection, secondary Y-connection band center line.
3. the grid-connected connecting circuit of a kind of three-phase energy accumulation current converter according to claim 1, is characterized in that: described
The controlled isolating switch of center line is controlled A.C. contactor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420234361.8U CN203800619U (en) | 2014-05-08 | 2014-05-08 | Grid-connected connection circuit for three-phase energy storage current transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420234361.8U CN203800619U (en) | 2014-05-08 | 2014-05-08 | Grid-connected connection circuit for three-phase energy storage current transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203800619U true CN203800619U (en) | 2014-08-27 |
Family
ID=51382807
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420234361.8U Expired - Lifetime CN203800619U (en) | 2014-05-08 | 2014-05-08 | Grid-connected connection circuit for three-phase energy storage current transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203800619U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105932697A (en) * | 2016-05-27 | 2016-09-07 | 陕西科技大学 | Three-phase balance control device used for long-distance low-voltage power transmission and three-phase balance control method thereof |
| CN107710100A (en) * | 2015-06-22 | 2018-02-16 | 阿迪尔森·诺盖拉·德·阿劳约 | Voltage regulator stabilizer and tap changer polarity-reversing switch without transition reactor |
| CN108649606A (en) * | 2018-05-25 | 2018-10-12 | 易事特集团股份有限公司 | And off-network switching device |
| CN111969586A (en) * | 2020-07-16 | 2020-11-20 | 深圳科士达科技股份有限公司 | Grid-connected and off-grid power supply system with anti-reflux function and control method thereof |
-
2014
- 2014-05-08 CN CN201420234361.8U patent/CN203800619U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107710100A (en) * | 2015-06-22 | 2018-02-16 | 阿迪尔森·诺盖拉·德·阿劳约 | Voltage regulator stabilizer and tap changer polarity-reversing switch without transition reactor |
| CN105932697A (en) * | 2016-05-27 | 2016-09-07 | 陕西科技大学 | Three-phase balance control device used for long-distance low-voltage power transmission and three-phase balance control method thereof |
| CN108649606A (en) * | 2018-05-25 | 2018-10-12 | 易事特集团股份有限公司 | And off-network switching device |
| CN108649606B (en) * | 2018-05-25 | 2020-10-09 | 易事特集团股份有限公司 | On-grid and off-grid switching device |
| CN111969586A (en) * | 2020-07-16 | 2020-11-20 | 深圳科士达科技股份有限公司 | Grid-connected and off-grid power supply system with anti-reflux function and control method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140827 |
|
| CX01 | Expiry of patent term |