CN103269083B - Multi-terminal high-voltage direct-current power transmission system - Google Patents
Multi-terminal high-voltage direct-current power transmission system Download PDFInfo
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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]
Abstract
The invention relates to a multi-terminal high-voltage direct-current power transmission system which comprises an extra-high voltage rectifier station and an extra-high voltage inverter station. The multi-terminal high-voltage direct-current power transmission system is characterized in that the system is a six-terminal series-parallel connection mixed-type unipolar direct-current power transmission system which is formed by an LCC and a VSC and used for conducting high-voltage high-capacity long-distance power transmission and supplying power to a weak alternating current system load center or a passive system load center. Voltage sharing and shunting of the VSC are completed through the mode that the LCC-VSC series branch is integrally connected into an LCC parallel-connection multi-terminal system in parallel. The aim of the high-voltage high-capacity long-distance power transmission is achieve, meanwhile, the VSC can transmit power to a weak system or a passive system, and therefore advantages of the LCC and the VSC can be comprehensively utilized. The multi-terminal high-voltage direct-current power transmission system can transmit power to large industrial centers which have high power requirements and densely-populated cities, and the multi-terminal high-voltage direct-current power transmission system can also achieve the aim that power can be transmitted to the weak alternating current system or the passive system, like a lonely island, due to the fact that the VSC is connected into the system.
Description
Technical field
The invention belongs to direct current transportation field is and in particular to a kind of multiterminal HVDC transmission system.
Background technology
The transverter of Traditional DC transmission of electricity is using being made up of IGCT, the transverter (LCC) based on line commutation, by LCC
The multi-terminal direct current transmission system constituting enables multiple feed and many drop points are subject to electricity, but because this technology needs connected friendship
Streaming system provides metastable commutation voltage, as the LCC straight-flow system of two ends, is only applicable to the electricity with certain short-circuit ratio
Force system is it is impossible to power to weak AC system and passive load center.
With the high speed development of Power Electronic Technique, the D.C. high voltage transmission (VSC-HVDC) based on voltage source converter
Research reaches its maturity, and puts into commercial operation.Compared based on the direct current transportation of LCC with tradition, VSC-HVDC can be operated in no
Source inverter mode, powers to weak AC system and passive system, realizes the transmission of active power and reactive power, improves exchange system
System stability, output voltage waveforms are good, power factor is high, harmonic wave is little.But VSC electric pressure and rated current are limited by IGBT device
The development of part, still cannot meet super-pressure Large Copacity long distance powedr transmission demand at present.
Content of the invention
For the deficiencies in the prior art, the present invention provides a kind of connection in series-parallel mixed type multi-terminal high-voltage being made up of LCC and VSC
, wherein there is LCC and VSC series arm in DC transmission system, and this series arm and remaining LCC end are parallel relationship, thus
VSC is achieved and all presses and shunt, meet VSC voltage and current restrictive condition.The system can comprehensive LCC high-voltage large-capacity long distance
From the advantage of transmission of electricity and VSC to weak pattern system and the advantage powered of passive system, it is a kind of fine to be that multi-terminal direct current transmission system provides
New thinking.The present invention provides a kind of multiterminal HVDC transmission system, and described system is for high-voltage large-capacity remote conveying
Electricity and the line commutation transverter LCC powering to weak AC system or passive system load center and voltage source converter VSC structure
The six end connection in series-parallel mixed type monopolar D. C transmission systems becoming.
Described multiterminal HVDC transmission system includes extra-high voltage converting plant 1, extra-high voltage converting plant 2, extra-high voltage Inverter Station
1st, extra-high voltage Inverter Station 2, super-pressure Inverter Station 3 and VSC Inverter Station 4；
Described extra-high voltage converting plant 1, extra-high voltage converting plant 2, extra-high voltage Inverter Station 1, extra-high voltage Inverter Station 2 and super-pressure are inverse
Becoming station 3 is the transverter based on IGCT；
Described VSC Inverter Station 4 is entirely to control the transverter of turn-off device based on IGBT；
Described extra-high voltage converting plant 1,2 and extra-high voltage Inverter Station 1,2 compose in parallel four end extra-high voltage DC transmission systems；
It is after described super-pressure Inverter Station 3 is connected with VSC Inverter Station 4, in parallel with extra-high voltage Inverter Station 2 as an entirety,
For flow for VSC Inverter Station 4 partial pressure with all；
Described extra-high voltage converting plant 1,2 and extra-high voltage Inverter Station 1,2 are used for high-voltage large-capacity long distance power transmission；
Described VSC Inverter Station 4 is used for powering to weak AC system or passive system load center；
One of 1,2 and two extra-high voltage Inverter Station of described extra-high voltage converting plant are all using constant DC current control；
Another described extra-high voltage Inverter Station adopts determines gamma kick, as voltage control station；
Described super-pressure Inverter Station 3 adopts constant DC current control, flows through described super-pressure inversion for control and adjustment
The DC current of 3 and VSC Inverter Station 4 of standing；
Described VSC Inverter Station 4 adopts determines DC voltage and determines alternating voltage to control；
The index of modulation that described VSC Inverter Station 4 passes through to change modulating wave controls alternating voltage；By changing the phase of modulating wave
Position controls DC voltage.
Compared with the prior art, the beneficial effect that the present invention reaches is：
The present invention proposes a kind of DC transmission system, is integrally coupled in parallel to LCC by LCC-VSC series arm in parallel
The form of multi-terminal system, completes all pressures to VSC current conversion station and shunting, is realizing the same of the remote power transmission of high-voltage large-capacity
When, VSC current conversion station again can be to weak pattern system or passive system power transmission, so as to utilize the superior combination of two kinds of transverters, for not
The development carrying out multi-terminal direct current transmission system provides a brand-new thinking.
Liang Ge extra-high voltage converting plant has very big transmission capacity, can concentrate the electric energy of neighbouring large-scale Energy Base
To be sent to distant place load center；Inverter Station 1 and Inverter Station 2 same as ultra-high voltage converter station, can be to high big of electricity needs
The type center of industry, Cities with Great Population power, and the access of VSC current conversion station, enable to weak AC system or isolated island etc. again
Passive system power transmission.
A kind of adaptable occasion of HVDC transmission system proposed by the present invention includes：
(1) transmit electric power several load centers in a distant place from Energy Base；
(2) in big city and the center of industry, cable must be used because overhead transmission line corridor can not solve, or short circuit is held
Amount is restricted when should not adopt Alternating Current Power Supply, is powered to several current conversion stations in these places using direct current transportation；
(3) it is respectively connected to load or power supply in the middle of DC power transmission line；
(4) the non-synchronous contact of several isolated AC systems is realized using DC line；
(5) connect distributed generation system etc..
Brief description
The six end connection in series-parallel mixed type monopolar D. C transmission systems that Fig. 1 provides for the present invention
Specific embodiment
Below in conjunction with the accompanying drawings the specific embodiment of the present invention is described in further detail.
Embodiment
As shown in figure 1, in a kind of HVDC transmission system proposed by the present invention, including：
In the extra-high voltage converting plant 1,2 and extra-high voltage Inverter Station 1,2 of two group of 12 pulse conversion devices series connection, every group of 12 arteries and veins
Dynamic transverter rated direct voltage 400kV, each rated direct voltage 800kV that stands.Super-pressure Inverter Station 3 is one group of 12 pulsation
Transverter, rated direct voltage 660kV.VSC Inverter Station 4 rated direct voltage 140kV.Extra-high voltage converting plant 1,2 rated current
2000A, extra-high voltage Inverter Station 1,2 rated current 1500A, super-pressure Inverter Station 3 and VSC Inverter Station 4 rated current 1000A.
Extra-high voltage converting plant 1,2 and extra-high voltage Inverter Station 1,2 compose in parallel four end extra-high voltage DC transmission systems, 660kV
After super-pressure Inverter Station 3 and VSC Inverter Station 4 are connected each other, in parallel with extra-high voltage Inverter Station 2 as an entirety, by this
Kind of series connection and method in parallel, have reached effect for VSC Inverter Station 4 partial pressure and equal stream it is achieved that the access of VSC.
The control thinking of Polynuclear complex system is identical with traditional multi-terminal HVDC transmission, selects under parallel way
One current conversion station maintains the normal DC voltage running of system, other change of current stand control DC currents；By one under series system
Individual current conversion station maintains the normal DC current running of system, remaining change of current stand control DC voltage.
For the system, during steady-state operation, extra-high voltage converting plant 1,2 and extra-high voltage Inverter Station 1 are all using determining DC current control
System, extra-high voltage Inverter Station 2 adopts determines gamma kick, as voltage control station, 4 end extra-high voltage direct-current transmission in this manner
System can be with stable operation；Super-pressure Inverter Station 3 and VSC Inverter Station 4 are equivalent to series system, and two station electric currents are equal, superelevation
Pressure Inverter Station 3 adopts constant DC current control, can be adjusted by its control and flow through described super-pressure Inverter Station 3 and VSC inversion
Stand 4 DC current.VSC Inverter Station 4 adopts determines DC voltage and alternating voltage control mode, wherein, alternating voltage phase
Control can be realized by changing the index of modulation of modulating wave；The control of DC voltage can be by changing the phase place of modulating wave
To realize.
The present invention design transmission system, by a change of current stand control DC voltage in parallel system, in series arm by
LCC change of current stand control DC current, VSC change of current stand control DC voltage, either series arm or parallel system all can be tieed up
Hold the stability of DC voltage and DC current.
The advantage of this structure is：Liang Ge extra-high voltage converting plant has very big transmission capacity, can will be neighbouring large-scale
The electric energy of Energy Base puts together and is sent to distant place load center；Inverter Station 1 and Inverter Station 2 same as ultra-high voltage converter station,
Can power to the high large scale industry center of electricity needs, Cities with Great Population；And the access of VSC current conversion station, enable to weak friendship
The passive system power transmission such as streaming system or isolated island.
The present invention can also be adjusted according to concrete engineering, each current conversion station all configure converter power transformer, alternating current filter,
DC filter, smoothing reactor.
Finally it should be noted that：Above example is only not intended to limit in order to technical scheme to be described, to the greatest extent
Pipe has been described in detail to the present invention with reference to above-described embodiment, and those of ordinary skill in the art should be understood：Still
The specific embodiment of the present invention can be modified or equivalent, and any without departing from spirit and scope of the invention
Modification or equivalent, it all should be covered in the middle of scope of the presently claimed invention.
Claims (1)
1. a kind of multiterminal HVDC transmission system is it is characterised in that described system includes the first extra-high voltage converting plant, the second spy
High-voltage rectifying station, the first extra-high voltage Inverter Station, the second extra-high voltage Inverter Station, super-pressure Inverter Station and VSC Inverter Station；
Described first extra-high voltage converting plant, the second extra-high voltage converting plant, the first extra-high voltage Inverter Station, the second extra-high voltage Inverter Station and
Super-pressure Inverter Station is line commutation transverter LCC, the as transverter based on IGCT；
Described VSC Inverter Station is entirely to control the transverter of turn-off device based on IGBT；
Described first extra-high voltage converting plant, the second extra-high voltage converting plant, the first extra-high voltage Inverter Station and the second extra-high voltage Inverter Station
All include two group of 12 pulse conversion devices, described two group of 12 pulse conversion devices are connected in series；
Described super-pressure Inverter Station includes one group of 12 pulse conversion devices；
It is defeated that described first, second extra-high voltage converting plant and first, second extra-high voltage Inverter Station compose in parallel four end extra-high voltage direct-currents
Electric system；
After described super-pressure Inverter Station is connected with VSC Inverter Station, in parallel with the second extra-high voltage Inverter Station as an entirety, it is used for
Flow for VSC Inverter Station partial pressure and all；
Described first, second extra-high voltage converting plant and first, second extra-high voltage Inverter Station are used for high-voltage large-capacity long distance power transmission；
Described VSC Inverter Station is used for powering to weak AC system or passive system load center；
One of described first, second extra-high voltage converting plant and two extra-high voltage Inverter Station are all using constant DC current control；
Another described extra-high voltage Inverter Station adopts determines gamma kick, as voltage control station；
Described super-pressure Inverter Station adopts constant DC current control, for control and adjustment flow through described super-pressure Inverter Station and
The DC current of VSC Inverter Station；
Described VSC Inverter Station adopts determines DC voltage and determines alternating voltage to control；
The index of modulation that described VSC Inverter Station passes through to change modulating wave controls alternating voltage；By changing the phase place control of modulating wave
DC voltage processed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201310140878.0A CN103269083B (en) | 2013-04-22 | 2013-04-22 | Multi-terminal high-voltage direct-current power transmission system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310140878.0A CN103269083B (en) | 2013-04-22 | 2013-04-22 | Multi-terminal high-voltage direct-current power transmission system |
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| CN103269083A CN103269083A (en) | 2013-08-28 |
| CN103269083B true CN103269083B (en) | 2017-02-22 |
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Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103855706A (en) * | 2014-02-25 | 2014-06-11 | 四川大学 | Hybrid pseudo-bipolar direct-current transmission method for supplying power to passive network and weak alternating-current network |
| CN105281354B (en) * | 2014-06-06 | 2018-03-13 | 南方电网科学研究院有限责任公司 | A kind of direct current transportation inverter side incoming transport systems approach |
| CN105743136B (en) * | 2014-12-11 | 2017-12-22 | 南京南瑞继保电气有限公司 | Suppress the method that multiple current conversion stations enter Passive Shape Control pattern under a kind of island state |
| CN104993509B (en) * | 2015-07-20 | 2017-07-25 | Abb技术有限公司 | Polynuclear complex system and its Inverter Station and control method |
| WO2017020269A1 (en) | 2015-08-05 | 2017-02-09 | Abb Schweiz Ag | Bidirectional power valve and control method therefor and hybrid multi-terminal hvdc system using the same |
| CN105262125B (en) * | 2015-11-12 | 2018-02-13 | 南方电网科学研究院有限责任公司 | Hybrid HVDC topological system |
| CN106451516B (en) * | 2016-08-27 | 2020-04-10 | 许继集团有限公司 | Direct-current fault ride-through method of hybrid multi-terminal high-voltage direct-current transmission system |
| CN106712071B (en) * | 2017-01-24 | 2019-09-06 | 特变电工新疆新能源股份有限公司 | The control method and control device of height valve type flexible HVDC transmission system |
| CN107046295A (en) * | 2017-02-05 | 2017-08-15 | 安徽康力节能电器科技有限公司 | A kind of six end HVDC transmission systems |
| CN107994599B (en) | 2017-12-07 | 2020-10-16 | 南京南瑞继保电气有限公司 | Coordination control method and device for series voltage source converter valve group |
| CN113452276B (en) * | 2021-06-03 | 2022-05-31 | 华中科技大学 | CCC-PHC type hybrid cascade direct current converter, rectifying station, inverter station and power transmission system |
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| CN102163842A (en) * | 2011-03-11 | 2011-08-24 | 国家电网公司直流建设分公司 | Method for switching control modes of parallel-connection type multi-terminal direct current power transmission system |
Non-Patent Citations (3)
| Title |
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