CN211183415U - DC line reformed by same-tower double-circuit AC line - Google Patents
DC line reformed by same-tower double-circuit AC line Download PDFInfo
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- CN211183415U CN211183415U CN201921499179.4U CN201921499179U CN211183415U CN 211183415 U CN211183415 U CN 211183415U CN 201921499179 U CN201921499179 U CN 201921499179U CN 211183415 U CN211183415 U CN 211183415U
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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 provides a direct current circuit reformed by a same-tower double-circuit alternating current circuit, which comprises a plurality of same-tower double-circuit alternating current circuit towers which are distributed in parallel, wherein three-phase wires are arranged on two sides of the same-tower double-circuit alternating current circuit towers, and two ends of an array formed by the plurality of same-tower double-circuit alternating current circuit towers are respectively provided with a direct current converter station; three-phase leads positioned on the same side of the same-tower double-circuit alternating current circuit tower are respectively connected in parallel between the positive pole and the negative pole of a direct current converter station positioned at two ends of the same-tower double-circuit alternating current circuit tower; three-phase wires positioned on two sides of the same-tower double-circuit alternating current circuit tower and direct current converter stations positioned on two ends of the same-tower double-circuit alternating current circuit tower form a loop; a converter device is connected in series between the positive pole and the negative pole of the direct current converter station, and the ground pole is connected between the two pole converter devices. The utility model discloses the realization is transformed into the operation of direct current circuit with current double-circuit alternating current circuit on tower, has perfected the technical scheme that alternating current circuit transformed into direct current circuit.
Description
Technical Field
The invention relates to the technical field of power transmission of power systems, in particular to a direct current circuit transformed by a same-tower double-circuit alternating current circuit and a transformation method thereof.
Background
With the continuous improvement of the economic level of China, the social electricity consumption and the power grid scale are both increased rapidly, but the available power transmission line corridors are fewer and fewer, and the land resources are extremely precious. Under the condition, when direct current transmission is needed to improve the transmission capacity or change the operation network structure of the regional power grid system, the existing same-tower double-circuit alternating current transmission line can be considered to achieve the purpose, and the mode can save land resources without newly increasing a transmission corridor and save most of project construction cost.
The alternating current circuit is changed into direct current operation, can be used for realizing asynchronous interconnection of a power grid, limiting short-circuit current of a system, changing a network structure for system operation and the like, and particularly has great applicability to cross-country power grid interconnection under the global energy Internet configuration.
At present, the technical scheme for transforming an alternating current transmission line into a direct current transmission line is to consider transforming a three-phase lead of an original single-circuit transmission line into a two-pole lead of the direct current transmission line, but if the original alternating current line is a same-tower double-circuit transmission line, how to transform the original single-circuit transmission line into the direct current line is not provided with a corresponding technical scheme.
Disclosure of Invention
The invention aims to provide a method for transforming a same-tower double-circuit alternating current circuit into a direct current circuit, which aims to overcome the defects of the prior art, realize the operation of transforming the prior same-tower double-circuit alternating current circuit into the direct current circuit and perfect the technical scheme of transforming the alternating current circuit into the direct current circuit.
The invention provides a direct current circuit transformed by a same-tower double-circuit alternating current circuit, which is characterized in that: the system comprises a plurality of same-tower double-circuit alternating current line towers which are distributed in parallel, wherein three-phase wires are uniformly distributed on two sides of the same-tower double-circuit alternating current line towers, and two ends of an array formed by the plurality of same-tower double-circuit alternating current line towers are respectively provided with a direct current converter station; three-phase leads positioned on the same side of the same-tower double-circuit alternating current circuit tower are respectively connected in parallel between the positive pole and the negative pole of a direct current converter station positioned at two ends of the same-tower double-circuit alternating current circuit tower; three-phase wires positioned on two sides of the same-tower double-circuit alternating current circuit tower and direct current converter stations positioned on two ends of the same-tower double-circuit alternating current circuit tower form a loop; a converter device is connected in series between the positive pole and the negative pole of the direct current converter station, and the ground pole is connected between the two pole converter devices. The tower and the three-phase lead are existing on the original double-circuit alternating current line on the same tower. The direct current converter station is newly added equipment, and the conversion between an alternating current line and a direct current line is realized through the reconnection of a lead and the direct current converter station.
In the technical scheme, the corridor, the tower, the lead, the ground wire, the insulator and the hardware on the original same-tower double-circuit alternating current line are not changed at all.
In the technical scheme, the converter device is connected in series between the positive electrode and the negative electrode of the direct current converter station, and the ground electrode is connected between the two pole converter devices.
In the technical scheme, the modified direct-current transmission line is a bipolar direct-current transmission line, one side of a tower is the anode of the direct-current line, and the other side of the tower is the cathode of the direct-current line; each pole of lead is the three-phase lead of the original same-tower double-circuit alternating current transmission line.
In the technical scheme, the transformed direct-current transmission line can be operated in a bipolar mode or a monopolar ground mode; when the double pole operates, the three-phase leads on the two sides of the pole tower are both used as direct current pole leads and are put into operation at the same time; when the monopole ground runs, the three-phase wire on one side of the tower is used as a direct-current monopole, and the three-phase wire on the other side of the tower is used as a grounding electrode circuit.
The invention has the advantages that: under the condition of keeping the materials of the original same-tower double-circuit AC line tower, the conducting wire, the insulator and the like completely unchanged, the AC line is transformed into the DC line to run, thereby saving the investment of transmission line corridors and engineering construction, and realizing the purposes of line transmission capacity, asynchronous interconnection of power grids, limitation of system short-circuit current, change of system running network structure and the like. The invention realizes the conversion of the AC line and the DC line only by resetting the DC converter stations at the two ends of the line and by rewiring.
Drawings
Fig. 1 is a schematic diagram of a same-tower double-circuit alternating-current transmission line tower.
Fig. 2 is a schematic diagram of an ac transmission system prior to retrofitting.
Fig. 3 is a schematic diagram of a modified dc power transmission system.
Fig. 4 is a schematic diagram of a modified direct-current transmission line tower.
Wherein, 1-pole tower and 2-wire.
Detailed Description
The invention will be further described in detail with reference to the following drawings and specific examples, which are not intended to limit the invention, but are for clear understanding.
As shown in fig. 1, a schematic diagram of the arrangement of the same-tower double-circuit alternating-current transmission line towers in normal operation is shown. A three-phase wire of an alternating current transmission line is arranged on each side of the tower, six-phase wires are arranged on the tower, and the six-phase wires are symmetrically arranged on the two sides of the tower.
Fig. 2 is a schematic diagram of a same-tower double-circuit alternating-current power transmission system before modification. Two-circuit alternating current lines on two sides of the tower are independently connected into substations on two sides, and each circuit consists of three phases.
When the same-tower double-circuit alternating current line is transformed into a direct current line to run, the concrete construction steps are as follows:
1. and transforming substations on two sides of the line into direct current converter stations respectively.
2. The same-double-circuit alternating current line is transformed into a direct current line. After the overhead line enters the converter station, the three-phase wires on each side of the same-tower double-circuit alternating current transmission line tower are simultaneously connected to the homopolar bus of the direct current converter station, namely the three phases are connected in parallel to form a direct current one pole. Each pole of the modified direct current transmission line is formed by connecting three-phase wires on one side of the original same-tower double-circuit alternating current transmission line in parallel. Fig. 2 is a schematic diagram of a modified dc power transmission system.
3. The three-phase wire on one side of the original same-tower double-circuit alternating current transmission line tower is one pole of the direct current transmission line, and the three-phase wire on the other side of the original same-tower double-circuit alternating current transmission line tower is the other pole of the direct current transmission line, namely the positive pole or the negative pole. After the direct current transmission line is transformed, the corridor, the pole tower, the lead, the ground wire, the insulator and the hardware on the original transmission line are not changed. Fig. 3 is a schematic layout of the modified bipolar direct current transmission line.
The modified direct-current transmission line is a bipolar direct-current transmission line, one side of the tower is the positive pole of the direct-current line, and the other side of the tower is the negative pole of the direct-current line. Each pole of lead is the three-phase lead of the original same-tower double-circuit alternating current transmission line. The transformed direct current transmission line can be operated in a bipolar mode and also can be operated in a monopolar ground mode. When the double pole operates, the leads on the two sides of the pole tower are both used as direct current pole leads and are put into operation at the same time; when the monopole is operated to the ground, the pole wire at one side of the tower is used as a direct current monopole, and the pole wire at the other side of the tower is used as a grounding pole line.
The invention can transform the AC line into the DC line for operation under the condition of keeping the materials of the original same-tower double-circuit AC line tower, the wire, the insulator and the like completely unchanged, saves the investment of the corridor and the engineering construction of the power transmission line, and can realize the purposes of line transmission capacity, asynchronous interconnection of the power grid, limitation of the short-circuit current of the system, change of the network structure of the system operation and the like.
Details not described in this specification are within the skill of the art that are well known to those skilled in the art.
Claims (4)
1. The utility model provides a direct current circuit by two return alternating current circuit transformation on tower which characterized in that: the system comprises a plurality of same-tower double-circuit alternating current line towers which are distributed in parallel, wherein three-phase wires are uniformly distributed on two sides of the same-tower double-circuit alternating current line towers, and two ends of an array formed by the plurality of same-tower double-circuit alternating current line towers are respectively provided with a direct current converter station; three-phase leads positioned on the same side of the same-tower double-circuit alternating current circuit tower are respectively connected in parallel between the positive pole and the negative pole of a direct current converter station positioned at two ends of the same-tower double-circuit alternating current circuit tower; three-phase wires positioned on two sides of the same-tower double-circuit alternating current circuit tower and direct current converter stations positioned on two ends of the same-tower double-circuit alternating current circuit tower form a loop; a converter device is connected in series between the positive pole and the negative pole of the direct current converter station, and the ground pole is connected between the two pole converter devices.
2. The dc link retrofitted from a double ac line on a same tower as claimed in claim 1, wherein:
a converter device is connected in series between the positive pole and the negative pole of the direct current converter station, and the ground pole is connected between the two pole converter devices.
3. The dc link retrofitted to said ac line with same tower as said claim 2, wherein:
the modified direct-current line is a bipolar direct-current transmission line, a three-phase lead on one side of a tower is the anode of the direct-current line, and a three-phase lead on the other side of the tower is the cathode of the direct-current line; each pole of lead is the three-phase lead of the original same-tower double-circuit alternating current transmission line.
4. The dc link retrofitted to said ac line with same tower as said claim 3, wherein:
the transformed direct current line performs bipolar operation or monopolar ground operation; when the double pole operates, the three-phase leads on the two sides of the pole tower are both used as direct current pole leads and are put into operation at the same time; when the monopole ground runs, the three-phase wire on one side of the tower is used as a direct-current monopole, and the three-phase wire on the other side of the tower is used as a grounding electrode circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921499179.4U CN211183415U (en) | 2019-09-10 | 2019-09-10 | DC line reformed by same-tower double-circuit AC line |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921499179.4U CN211183415U (en) | 2019-09-10 | 2019-09-10 | DC line reformed by same-tower double-circuit AC line |
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| Publication Number | Publication Date |
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| CN211183415U true CN211183415U (en) | 2020-08-04 |
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| CN201921499179.4U Active CN211183415U (en) | 2019-09-10 | 2019-09-10 | DC line reformed by same-tower double-circuit AC line |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110601165A (en) * | 2019-09-10 | 2019-12-20 | 中国电力工程顾问集团中南电力设计院有限公司 | DC line reconstructed by same-tower double-circuit AC line and reconstruction method thereof |
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2019
- 2019-09-10 CN CN201921499179.4U patent/CN211183415U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110601165A (en) * | 2019-09-10 | 2019-12-20 | 中国电力工程顾问集团中南电力设计院有限公司 | DC line reconstructed by same-tower double-circuit AC line and reconstruction method thereof |
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