CN204205616U - The bipolar main electrical scheme device of a kind of flexible DC power transmission - Google Patents
The bipolar main electrical scheme device of a kind of flexible DC power transmission Download PDFInfo
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- CN204205616U CN204205616U CN201420679976.1U CN201420679976U CN204205616U CN 204205616 U CN204205616 U CN 204205616U CN 201420679976 U CN201420679976 U CN 201420679976U CN 204205616 U CN204205616 U CN 204205616U
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 32
- 238000006243 chemical reaction Methods 0.000 claims abstract description 95
- 239000004020 conductor Substances 0.000 claims abstract description 38
- 239000002184 metal Substances 0.000 claims description 25
- 238000010586 diagram Methods 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 230000005611 electricity Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
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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]
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Abstract
The utility model relates to the bipolar main electrical scheme device of a kind of flexible DC power transmission, comprise two current conversion stations, two AC AC electric power systems and a plain conductor, two current conversion station structures are identical, be connected together in series by the first transformer, the first change of current device, the second change of current device and the second transformer, first transformer and the second transformer are connected in one end of a bus respectively in parallel, and the other end of bus connects AC AC electric power systems; First change of current device of the first current conversion station is connected respectively by straight line cable with the second change of current device of the second current conversion station with the first change of current device of the second current conversion station and the second change of current device of the first current conversion station, plain conductor one end is connected on the circuit between the first change of current device of the first current conversion station and the second change of current device, and the other end connects on the circuit between the first change of current device of the second current conversion station and the second change of current device.The utility model provides a kind of and arranges safety, the reliable bipolar main electrical scheme device of flexible DC power transmission, can be widely used in flexible direct-current transmission field.
Description
Technical field
The utility model relates to flexible direct-current transmission field, particularly about the bipolar main electrical scheme device of a kind of flexible DC power transmission.
Background technology
Flexible DC power transmission is a kind of VSC-HVDC technology outside conventional high-tension HVDC Transmission Technology, the feature that it is different from conventional high-tension HVDC Transmission Technology is that it adopts the semiconductor device (such as IGBT) of full-control type (can from conducting and shutoff) to carry out AC-DC conversion, and conventional high-tension HVDC Transmission Technology adopts the semiconductor device (as thyristor) of half control type (can not certainly can turn off from conducting) to carry out AC-DC conversion, need to rely on AC electric power systems to assist cutoff thyristor to its external voltage provided, guarantee that AC-DC conversion is normally carried out.Technology of HVDC based Voltage Source Converter and Traditional DC technology of transmission of electricity common ground are to be provided with both positive and negative polarity (pole I is positive pole, and pole II is negative pole), symmetrical operation mode during general employing positive and negative electrodes in same.Flexible DC power transmission engineering installation sending end and receiving end two current conversion stations, each current conversion station all adopts bipolar main electrical scheme connected mode.
As shown in Figure 1 and Figure 2, the bipolar main electrical scheme connected mode that two current conversion stations of existing flexible DC power transmission engineering adopt usually is that the change of current device of two current conversion stations connects by two straight line cables respectively, make to form loop between two current conversion stations, and two direct ground connection of current conversion station, adopt this kind of connected mode in theory pole I and pole II normal symmetrical operation time, by the current i 1 of pole I with should be that numerical value is the same by pole II current i 2, direction is contrary, just can be cancelled out each other by the electric current of pole I and pole II like this, the unsymmetrical current i1+i2=0 in the earth; But when reality uses, due to the manufacture of two ends current conversion station equipment and line facility, installation, operational factor difference, during the normal symmetrical operation of the pole I of two current conversion stations and pole II, current values absolute value is different, unsymmetrical current i1+i2 ≠ 0 in the earth, the earth that unsymmetrical current i1+i2 will flow through between the earth point of two ends current conversion station and two earth points.Along with the transmission capacity of flexible DC power transmission engineering is increasing, its rated current also corresponding increase, reach a few kiloampere, the unsymmetrical current entering ground also will increase, the simple grounding system of two ends current conversion station can not meet the service requirement compared with large unbalance earth current, and big current impacts the industrial plants (as metallic conduit, electric power facility) between the current conversion station of two ends.
Summary of the invention
For the problems referred to above, the purpose of this utility model is to provide a kind ofly arranges safety, the reliable bipolar main electrical scheme device of flexible DC power transmission.
For achieving the above object, the utility model takes following technical scheme: the bipolar main electrical scheme device of a kind of flexible DC power transmission, it is characterized in that: it comprises the first current conversion station, the second current conversion station, two AC AC electric power systems and a plain conductor, and described first current conversion station is identical with the second current conversion station structure; Described first current conversion station and the second current conversion station are connected together in series by the first transformer, the first change of current device, the second change of current device and the second transformer, first transformer described in each and the second transformer are connected in one end of a bus respectively in parallel, and the other end of bus described in each connects corresponding described AC AC electric power systems respectively;
The first change of current device in described first current conversion station is connected by straight line cable with the first change of current device in described second current conversion station, and the second change of current device in described first current conversion station is connected by straight line cable with the second change of current device in described second current conversion station; One end of described plain conductor is connected on the circuit between the first change of current device in described first current conversion station and the second change of current device, the other end of described plain conductor is connected on the circuit between the first change of current device in described second current conversion station and the second change of current device, makes the first change of current device in the first transformer in AC AC electric power systems described in two, described first current conversion station, the first change of current device in described first current conversion station, described second current conversion station, the first transformer in described second current conversion station and described plain conductor form pole I metal reflow circuit; Correspondingly, the second transformer in the second transformer in AC AC electric power systems, described first current conversion station described in two, the second change of current device in described first current conversion station, the second change of current device in described second current conversion station, described second current conversion station and described plain conductor form pole II metal reflow circuit.
Arrange an earth point in described first current conversion station or the first current conversion station, one end of described plain conductor connects described earth point.
Described first change of current device and the second change of current device all adopt modular multilevel full-control type converter valve.
The utility model is owing to taking above technical scheme, it has the following advantages: 1, the utility model arranges a plain conductor owing to adopting between two current conversion stations in flexible DC power transmission engineering, form pole I metal reflow circuit and pole II metal reflow circuit, the earth point as the earth zero-potential point is provided with in a wherein current conversion station in two current conversion stations, one end of plain conductor is made to connect earth point, and the resistance of plain conductor is very little, make plain conductor voltage much smaller than limiting voltage, therefore, can significantly reduce plain conductor insulation level, reduce investment outlay, also reduce heating loss when electric current flows through simultaneously.2, the utility model arranges a plain conductor owing to adopting between in flexible DC power transmission engineering two backflow stations, form pole I metal reflow circuit and pole II metal reflow circuit, therefore, when in pole I metal reflow circuit or pole II metal reflow circuit wherein a metal reflow circuit breaks down time, another metal reflow circuit can also ensure the rated power conveying capacity of 50%, reliable.In sum, the utility model can be widely used in flexible direct-current transmission field.
Accompanying drawing explanation
Fig. 1 is flexible DC power transmission of the prior art bipolar main electrical scheme device schematic diagram;
Fig. 2 is flexible DC power transmission of the prior art bipolar main electrical scheme current path schematic diagram;
Fig. 3 is flexible DC power transmission of the present utility model bipolar main electrical scheme device schematic diagram;
Fig. 4 is flexible DC power transmission of the present utility model bipolar main electrical scheme current path schematic diagram.
Embodiment
Below in conjunction with drawings and Examples, the utility model is described in detail.
As shown in Figure 3, to comprise the first current conversion station 1, second current conversion station 2, two AC AC electric power systems 3 identical with the second current conversion station 2 structure with plain conductor 4, first current conversion station 1 for the bipolar main electrical scheme device of flexible DC power transmission of the present utility model, each current conversion station is connected together in series by the first transformer 5, first change of current device 6, second change of current device 7 and the second transformer 8, first transformer 5 and the second transformer 8 are connected in one end of a bus 9 respectively in parallel, and the other end of each bus 9 connects corresponding AC AC electric power systems 3 respectively, wherein, the first change of current device 6 in first current conversion station 1 is connected by straight line cable 10 with the first change of current device 6 in the second current conversion station 2, the second change of current device 7 in first current conversion station 1 is connected by straight line cable 10 with the second change of current device 7 in the second current conversion station 2, one end of plain conductor 4 is connected on the circuit between the first change of current device 6 in the first current conversion station 1 and the second change of current device 7, the other end of plain conductor 4 connects on the circuit between the first change of current device 6 in the second current conversion station 2 and the second change of current device 7, make two AC AC electric power systems 3, the first transformer 5 in first current conversion station 1, the first change of current device 6 in first current conversion station 1, the first change of current device 6 in second current conversion station 2 and the first transformer 5 in the second current conversion station 2 and plain conductor 4 form pole I metal reflow circuit, correspondingly, two AC AC electric power systems 3, the second transformer 8 in first current conversion station 1, the second change of current device 7 in first current conversion station 1, in second current conversion station 2 the second change of current device 7 and the second current conversion station in 2 the second transformer 8 and plain conductor 4 form pole II metal reflow circuit.
In a preferred embodiment, in order to limit the voltage of metal reflow circuit, be provided with earth point T in the wherein current conversion station in two current conversion stations, one end of plain conductor 4 connects earth point T, and this earth point T does not flow through electric current, as just the earth zero-potential point.
In a preferred embodiment, concrete property parameter such as cross-sectional sizes, material and the pattern etc. of plain conductor 4 can be determined according to actual needs, do not limit at this.
In preferably implementing at one, each change of current device (MMC) all can adopt modular multilevel full-control type converter valve (IGBT).
The operation principle of the bipolar main electrical scheme device of flexible DC power transmission of the present utility model is described in detail below by specific embodiment:
As Fig. 3, shown in Fig. 4, in Xiamen ± 320kV flexible DC power transmission science and technology demonstration project (1000 megawatt), two AC AC electric power systems 3, the first transformer 5 and the first change of current device 6 in first current conversion station 1, the first transformer 5 in second current conversion station 2 and the first change of current device 6 and plain conductor 4 form pole I metal reflow circuit, two AC AC electric power systems 3, the second transformer 8 and the second change of current device 7 in first current conversion station 1, the second transformer 8 in second current conversion station 2 and the second change of current device 7 and plain conductor 4 form pole II metal reflow circuit, plain conductor 4 and the first current conversion station 1 arrange an earth point T jointly.Wherein, in the I metal reflow circuit of pole, the voltage of equipment is ﹢ 320kV, equipment voltage in the II metal reflow circuit of pole is ﹣ 320kV, earth point T is the zero-potential point of whole Xiamen flexible direct current power transmission system, left side (earth point) current potential of plain conductor 4 is 0, current potential on the right side of plain conductor 4=(the unsymmetrical current i1+i2 of pole I metal reflow circuit and pole II metal reflow circuit) * plain conductor resistance, because plain conductor 4 resistance is generally less than 10 ohm, much smaller than the resistance of electric current through too greatly time (be generally hundreds of ohm ~ tens kilo-ohm not etc.), so current potential will much smaller than line voltage (320kV) on the right side of plain conductor 4, when i1 or i2 is 0, it is 1600A that unsymmetrical current i1+i2 gets maximum, so on the right side of plain conductor 4, current potential is only 16000 volts (plain conductor 4 resistance gets 10 ohm), far below the voltage of polar curve 320kV, remarkable reduction plain conductor 4 insulation level, reduce investment outlay, also reduce heating loss when electric current flows through simultaneously.In addition, when in pole I metal reflow circuit or pole II metal reflow circuit wherein a metal reflow circuit breaks down time, another metal reflow circuit can also ensure the rated power conveying capacity of 50%.
The various embodiments described above are only for illustration of the utility model; wherein the structure of each parts, connected mode and manufacture craft etc. all can change to some extent; every equivalents of carrying out on the basis of technical solutions of the utility model and improvement, all should not get rid of outside protection range of the present utility model.
Claims (3)
1. the bipolar main electrical scheme device of flexible DC power transmission, is characterized in that: it comprises the first current conversion station, the second current conversion station, two AC AC electric power systems and a plain conductor, and described first current conversion station is identical with the second current conversion station structure; Described first current conversion station and the second current conversion station are connected together in series by the first transformer, the first change of current device, the second change of current device and the second transformer, first transformer described in each and the second transformer are connected in one end of a bus respectively in parallel, and the other end of bus described in each connects corresponding described AC AC electric power systems respectively;
The first change of current device in described first current conversion station is connected by straight line cable with the first change of current device in described second current conversion station, and the second change of current device in described first current conversion station is connected by straight line cable with the second change of current device in described second current conversion station; One end of described plain conductor is connected on the circuit between the first change of current device in described first current conversion station and the second change of current device, the other end of described plain conductor is connected on the circuit between the first change of current device in described second current conversion station and the second change of current device, makes the first change of current device in the first transformer in AC AC electric power systems described in two, described first current conversion station, the first change of current device in described first current conversion station, described second current conversion station, the first transformer in described second current conversion station and described plain conductor form pole I metal reflow circuit; Correspondingly, the second transformer in the second transformer in AC AC electric power systems, described first current conversion station described in two, the second change of current device in described first current conversion station, the second change of current device in described second current conversion station, described second current conversion station and described plain conductor form pole II metal reflow circuit.
2. the bipolar main electrical scheme device of a kind of flexible DC power transmission as claimed in claim 1, it is characterized in that: arrange an earth point in described first current conversion station or the first current conversion station, one end of described plain conductor connects described earth point.
3. the bipolar main electrical scheme device of a kind of flexible DC power transmission as claimed in claim 1 or 2, is characterized in that: described first change of current device and the second change of current device all adopt modular multilevel full-control type converter valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420679976.1U CN204205616U (en) | 2014-11-10 | 2014-11-10 | The bipolar main electrical scheme device of a kind of flexible DC power transmission |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420679976.1U CN204205616U (en) | 2014-11-10 | 2014-11-10 | The bipolar main electrical scheme device of a kind of flexible DC power transmission |
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| Publication Number | Publication Date |
|---|---|
| CN204205616U true CN204205616U (en) | 2015-03-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420679976.1U Withdrawn - After Issue CN204205616U (en) | 2014-11-10 | 2014-11-10 | The bipolar main electrical scheme device of a kind of flexible DC power transmission |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104362661A (en) * | 2014-11-10 | 2015-02-18 | 国家电网公司 | Flexible DC transmission bipolar main junction device |
| CN107968588A (en) * | 2017-12-17 | 2018-04-27 | 华中科技大学 | Cascade converter valve, direct-current power transmission system and control method thereof |
-
2014
- 2014-11-10 CN CN201420679976.1U patent/CN204205616U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104362661A (en) * | 2014-11-10 | 2015-02-18 | 国家电网公司 | Flexible DC transmission bipolar main junction device |
| CN107968588A (en) * | 2017-12-17 | 2018-04-27 | 华中科技大学 | Cascade converter valve, direct-current power transmission system and control method thereof |
| CN107968588B (en) * | 2017-12-17 | 2019-08-30 | 华中科技大学 | Cascade converter valve, direct-current power transmission system and control method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20150311 Effective date of abandoning: 20171114 |
|
| AV01 | Patent right actively abandoned |