CN104078968A - Direct-current transmission channel formed by transforming three-phase alternating current transmission cable - Google Patents
Direct-current transmission channel formed by transforming three-phase alternating current transmission cable Download PDFInfo
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- CN104078968A CN104078968A CN201410328464.5A CN201410328464A CN104078968A CN 104078968 A CN104078968 A CN 104078968A CN 201410328464 A CN201410328464 A CN 201410328464A CN 104078968 A CN104078968 A CN 104078968A
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Abstract
The invention provides a direct-current transmission channel formed by transforming a three-phase alternating current transmission cable. The direct-current transmission channel comprises the three-phase alternating current transmission cable, back brake loops and a current converter, wherein the two ends of the three-phase alternating current transmission cable are respectively connected with the direct current end of the current converter through the back brake loops, and the alternating current end of the current converter is connected with an alternating current system. Due to back brake operation, each phase of the three-phase alternating current cable can be connected into the two direct current poles in a switched mode, two phases of the three-phase alternating current cable can be connected into one pole in turn, the other phase is connected into the other pole, and two direct current transmission channel bodies are formed. Compared with the prior art, the direct-current transmission channel has the advantages that the transformation method is easy and convenient to use, an original system is sufficiently used, the power transmission reliability is high.
Description
Technical field
The present invention relates to a kind of remodeling method of cable power transmission passage, especially relate to a kind of direct current transportation passage of being transformed by three-phase alternating current power transmission cable.
Background technology
Along with the rapid growth of urban economy, the quickening of Process of Urbanization Construction paces, overhead wire electrical network is more and more not suitable with the requirement of load growth and environment, and the cable line in city is at increase year after year.Underground supply power mode to city adopts the power supply of high-voltage alternating cable mostly at present, for improving the power supply reliability of urban distribution network, it is general that what adopt is solid dielectric cable, twisted polyethylene cable particularly, and its ampacity is large, lightweight, simple installation, maintenance is little and fire-resistant etc.Yet, under identical electric pressure, the charging current of ac cable is more much higher than overhead wire, higher capacitive charge-current limit maximum transmission distance and the transmission capacity of cable, and the capacitive reactive power that ac cable produces increases along with the increase of electric pressure and cable length, in order to increase maximum transmission distance and the transmission capacity of ac cable, must carry out reactive power compensation at the two ends of cable.
Compare with ac cable transmission of electricity, direct current cables transmission of electricity has higher current capacity (because ac cable has kelvin effect) and operating voltage, and the ac cable long-pending with same cross-sectional compared, and direct current cables has higher transmittability.On the other hand, in cable power supply circuit, there is larger capacitance current in ac cable power supply, causes no small power loss, and direct current cables power supply does not have capacitance current to produce.
For cable, adopt ac power supply method, when the system of feeder ear or receiving end is short-circuited, opposite side will be carried short circuit current to fault one side, increase the capacity of short circuit of two side systems, causes sometimes the original circuit breaker of part can not meet that rupturing capacity requires and the equipment that more renews; And the quick control device that adopts direct current supply mode can rely on direct current system itself to have, can regulate quickly and easily direct current system power, in DC line, substantially to the AC system being short-circuited, do not carry short circuit current, the capacity of short circuit of the system of can not increasing exchanges.
AC transmission system is used three cables to realize three-phase power transmitting, and DC transmission system realizes delivery of electrical energy according to different one of system topological use or two cables.Therefore, when transforming ac transmission cable passage as direct current transportation cable passage, existing technical scheme is two that retain in three transmission cables, the 3rd or pass into disuse or be used as ground wire.Although this modification scheme has improved transmission capacity, do not make full use of existing resource.
Summary of the invention
Object of the present invention is exactly to provide a kind of direct current transportation passage of being transformed by three-phase alternating current power transmission cable in order to overcome the defect of above-mentioned prior art existence, and remodeling method is easy, makes full use of original ac transmission cable, and reliability is high.
In order to achieve the above object, solution of the present invention is:
A direct current transportation passage of being transformed by three-phase alternating current power transmission cable, is characterized in that: comprise three-phase alternating current cable, back brake loop and converter, wherein, the two ends of described three-phase alternating current cable are all connected with the DC terminal of described converter through back brake loop; The interchange end of converter is connected with AC system.
Further, described back brake loop is used for, and by leading lock, operates, and every two direct current utmost points of access that all can alternately switch mutually of three-phase alternating current cable, form two direct current transportation cable passages.
Further, described direct current transportation passage is, the wherein two-phase alternating current cable of rotation forms a direct current utmost point, and an other cross streams cable forms another direct current utmost point.
Further, two described direct current transportation cable passages are respectively as anodal power transmission cable passage and the negative pole power transmission cable passage of bipolar direct current transmission system.
Further, two described direct current transportation cable passages are respectively as utmost point power transmission cable passage and the earth electrode power transmission cable passage of one pole DC transmission system.
Further, described back brake loop consists of at least one change over switch, and described change over switch is isolation switch or circuit breaker or the switch that consists of power electronic equipment.
Further, described converter is current source type converter or is voltage-source type converter.
From the above technical solution of the present invention shows that, ac transmission cable passage provided by the invention changes the method for direct current transportation passage into can utilize original AC transmission wire completely, fully, promote transmission line capability, and there is higher reliability than traditional modification scheme.
Accompanying drawing explanation
Fig. 1 is for changing ac transmission cable passage into the structural representation of direct current transportation passage;
Fig. 2 is the structural representation that improved direct current transportation passage is connected with voltage source converter.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is elaborated.
The present invention proposes a kind of method that ac transmission cable passage changes direct current transportation passage into, and an one preferred embodiment as shown in Figure 1.In figure, 1 is three-phase alternating current power transmission cable, and 2,3 for leading lock loop, and 4,5 is DC terminal.
The direct current transportation passage of being transformed by three-phase alternating current power transmission cable, the two ends of three-phase alternating current cable 1 are all connected with the DC terminal 4,5 of converter through back brake loop 2,3, by leading lock, operate, make often alternating of three-phase alternating current cable 1 switch two DC terminal 4,5 of access, form two direct current transportation cables.
By three-phase alternating current power transmission cable, transformed direct current transportation passage time, rotation will be wherein two-phase alternating current cable form a direct current utmost point, an other cross streams cable forms another direct current utmost point.
The direct current transportation passage of being transformed by three-phase alternating current power transmission cable, can be using two direct current transportation cable passages that form respectively as anodal power transmission cable passage and the negative pole power transmission cable passage of bipolar direct current transmission system.
The direct current transportation passage of being transformed by three-phase alternating current power transmission cable, can be using two direct current transportation cable passages that form respectively as utmost point power transmission cable passage and the earth electrode power transmission cable passage of one pole DC transmission system.
Aforementioned back brake loop 2,3 consists of at least one change over switch, and described change over switch is isolation switch or circuit breaker or the switch that consists of power electronic equipment.
Aforementioned converter can be current source type converter or is voltage-source type converter, another embodiment as shown in Figure 2, three-phase alternating current cable is accessed to the direct current utmost point 4 of voltage source converter (VSC) 6, the opposite side phase-splitting incoming transport system of voltage source converter 6 through leading lock loop.
Finally should be noted that: in conjunction with above-described embodiment, only illustrate that technical scheme of the present invention is not intended to limit.Those of ordinary skill in the field are to be understood that: those skilled in the art can modify or be equal to replacement the specific embodiment of the present invention, but within the claimed scope of patent that these modifications or change are all awaited the reply in application.
Claims (7)
1. a direct current transportation passage of being transformed by three-phase alternating current power transmission cable, is characterized in that: comprise three-phase alternating current cable, back brake loop, converter, wherein, the two ends of described three-phase alternating current cable are all connected with the DC terminal of described converter through back brake loop; The interchange end of converter is connected with AC system.
2. a kind of direct current transportation passage of being transformed by three-phase alternating current power transmission cable as claimed in claim 1, it is characterized in that, described back brake loop is used for, and by leading lock, operates, every two direct current utmost points of access that all can alternately switch mutually of three-phase alternating current cable, form two direct current transportation cable passages.
3. a kind of direct current transportation passage of being transformed by three-phase alternating current power transmission cable as claimed in claim 1, is characterized in that, the wherein two-phase alternating current cable of rotation forms a direct current utmost point, and an other cross streams cable forms another direct current utmost point.
4. a kind of direct current transportation passage of being transformed by three-phase alternating current power transmission cable according to claim 2, it is characterized in that, two described direct current transportation cable passages are respectively as anodal power transmission cable passage and the negative pole power transmission cable passage of bipolar direct current transmission system.
5. a kind of direct current transportation passage of being transformed by three-phase alternating current power transmission cable according to claim 2, is characterized in that, two direct current transportation cable passages are respectively as utmost point power transmission cable passage and the earth electrode power transmission cable passage of one pole DC transmission system.
6. a kind of direct current transportation passage of being transformed by three-phase alternating current power transmission cable as claimed in claim 1, it is characterized in that, described back brake loop consists of at least one change over switch, and described change over switch is isolation switch or circuit breaker or the switch that consists of power electronic equipment.
7. a kind of direct current transportation passage of being transformed by three-phase alternating current power transmission cable as claimed in claim 1, is characterized in that, described converter is current source type converter or is voltage-source type converter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201410328464.5A CN104078968A (en) | 2014-07-10 | 2014-07-10 | Direct-current transmission channel formed by transforming three-phase alternating current transmission cable |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410328464.5A CN104078968A (en) | 2014-07-10 | 2014-07-10 | Direct-current transmission channel formed by transforming three-phase alternating current transmission cable |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105162157A (en) * | 2015-09-15 | 2015-12-16 | 国网辽宁省电力有限公司经济技术研究院 | Three-phase H bridge based voltage current change-over switch |
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| US20030178891A1 (en) * | 2002-03-19 | 2003-09-25 | Toshihisa Miyamoto | Gas insulated switch |
| CN101325322A (en) * | 2008-04-09 | 2008-12-17 | 国网直流工程建设有限公司 | AC line-feeding deicing connection plan for current-exchanging station |
| CN101505044B (en) * | 2009-03-19 | 2012-03-14 | 浙江省电力设计院 | Three bus access method for DC ice melting current |
| CN202535082U (en) * | 2012-03-30 | 2012-11-14 | 上海市电力公司 | Static synchronous compensator operating system under mode of parallel connection of flexible direct current system and wind power farm |
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2014
- 2014-07-10 CN CN201410328464.5A patent/CN104078968A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030178891A1 (en) * | 2002-03-19 | 2003-09-25 | Toshihisa Miyamoto | Gas insulated switch |
| CN101325322A (en) * | 2008-04-09 | 2008-12-17 | 国网直流工程建设有限公司 | AC line-feeding deicing connection plan for current-exchanging station |
| CN101505044B (en) * | 2009-03-19 | 2012-03-14 | 浙江省电力设计院 | Three bus access method for DC ice melting current |
| CN202535082U (en) * | 2012-03-30 | 2012-11-14 | 上海市电力公司 | Static synchronous compensator operating system under mode of parallel connection of flexible direct current system and wind power farm |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105162157A (en) * | 2015-09-15 | 2015-12-16 | 国网辽宁省电力有限公司经济技术研究院 | Three-phase H bridge based voltage current change-over switch |
| CN105162157B (en) * | 2015-09-15 | 2019-02-05 | 国网辽宁省电力有限公司经济技术研究院 | A kind of Voltage to current transducer switch based on three-phase H bridge |
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Application publication date: 20141001 |
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