CN103269083A - 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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- CN103269083A CN103269083A CN2013101408780A CN201310140878A CN103269083A CN 103269083 A CN103269083 A CN 103269083A CN 2013101408780 A CN2013101408780 A CN 2013101408780A CN 201310140878 A CN201310140878 A CN 201310140878A CN 103269083 A CN103269083 A CN 103269083A
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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 the direct current transportation field, be specifically related to a kind of multiterminal HVDC transmission system.
Background technology
The converter of tradition direct current transportation adopt by thyristor constitute, based on the converter (LCC) of electrical network commutation, the multiterminal DC transmission system that is made of LCC can realize that multiple feed and many drop points are subjected to, but because the AC system that this Technology Need connects provides metastable commutation voltage, the same with two ends LCC direct current system, only be applicable to the electric power system with certain short circuit ratio, can not be to weak AC system and the power supply of passive load center.
Along with the high speed development of power electronic technology, reach its maturity based on the research of the high voltage direct current transmission (VSC-HVDC) of voltage source converter, and put into commercial operation.Compare based on the direct current transportation of LCC with tradition, VSC-HVDC can be operated in the passive inverter state, to weak AC system and passive system power supply, realizes the transmission of active power and reactive power, improve AC system stability, output voltage waveforms is good, power factor is high, harmonic wave is little.But VSC electric pressure and rated current are limited by the development of IGBT device, still can't satisfy the big capacity long distance powedr transmission of superhigh pressure demand at present.
Summary of the invention
At the deficiencies in the prior art, the invention provides a kind of connection in series-parallel mixed type multiterminal HVDC transmission system that is constituted by LCC and VSC, wherein there are LCC and VSC series arm, and this series arm is relation in parallel with all the other LCC ends, thereby VSC has been realized all pressing and shunting, satisfied VSC voltage and current restrictive condition.The advantage of the comprehensive LCC high-voltage large-capacity long distance power transmission of native system energy and VSC are to the advantage of weak pattern system and passive system power supply, for the multiterminal DC transmission system provides a kind of brand-new thinking.
The objective of the invention is to adopt following technical proposals to realize:
A kind of multiterminal HVDC transmission system, described system comprises ultra high voltage converting plant and ultra high voltage Inverter Station, it is characterized in that described system is for the high-voltage large-capacity long distance power transmission with to the electrical network commutation converter LCC of weak AC system or the power supply of passive system load center and the six end connection in series-parallel mixed type one pole DC transmission system that voltage source converter VSC constitutes.
Preferably, the converter of described electrical network commutation LCC-Line Commutation Converter is the converter based on thyristor; VSC-Voltage Source Converter is the converter of controlling turn-off device based on IGBT entirely.
Preferably, described system comprises all the other LCC ends in parallel with the VSC series arm with LCC.
Preferably, described system comprises two ultra high voltage converting plants and two ultra high voltage Inverter Station of two group of 12 pulse conversion device series connection.
Preferably, in parallel with all the other ultra high voltage Inverter Station after superhigh pressure Inverter Station in the described system and the series connection of VSC Inverter Station, be used to VSC current conversion station dividing potential drop and current-sharing.
Preferably, the ultra high voltage current conversion station is used for the high-voltage large-capacity long distance power transmission.
Preferably, described VSC Inverter Station is used for to weak AC system or the power supply of passive system load center.
Preferably, one of described ultra high voltage converting plant and two ultra high voltage Inverter Station all adopt and decide direct current control.
Preferably, described another ultra high voltage Inverter Station adopts decides extinguish angle control, as the voltage control station.
Preferably, superhigh pressure Inverter Station in the described series arm adopts decide direct current control, is used for control and adjusts the direct current that flow through this Inverter Station and VSC stand.
Preferably, described VSC Inverter Station adopts and decides direct voltage and decide alternating voltage control.
Preferably, by changing the index of modulation control alternating voltage of modulating wave; By changing the phase control direct voltage of modulating wave.
Compared with the prior art, the beneficial effect that reaches of the present invention is:
The present invention proposes a kind of DC transmission system, be linked into the form of LCC multi-terminal system in parallel by the whole parallel connection of LCC-VSC series arm, all pressures and shunting to the VSC current conversion station have been finished, when realizing high-voltage large-capacity long distance electricity, the VSC current conversion station can send to weak pattern system or passive system again, thereby can be with the comprehensive utilization of the advantage of two kinds of converters, for the development of following multiterminal DC transmission system provides a brand-new thinking.
Two ultra high voltage converting plants have very big transmission capacity, the electric energy in contiguous large-scale energy base can be put together and be sent to distant place load center; Inverter Station 1 and Inverter Station 2 can give high large scale industry center, the densely populated urban electricity supply of electricity needs, and the access of VSC current conversion station can realize again sending to passive systems such as weak AC system or isolated islands equally as the ultra high voltage current conversion station.
The adaptable occasion of a kind of HVDC (High Voltage Direct Current) transmission system that the present invention proposes comprises:
(1) transmit electric power from energy base several load centers in a distant place;
(2) in big city and the center of industry, must use cable because the overhead transmission line corridor can not solve, or capacity of short circuit is restricted in the time of should not adopting Alternating Current Power Supply, utilize direct current transportation to several current conversion stations power supplies in these places;
(3) insert load or power supply in the middle of the DC power transmission line respectively;
(4) utilize DC line to realize the non-contact same period of several isolated AC system;
(5) connect distributed generation system etc.
Description of drawings
Fig. 1 is six end connection in series-parallel mixed type one pole DC transmission system provided by the invention
Embodiment
Below in conjunction with accompanying drawing the specific embodiment of the present invention is described in further detail.
Embodiment
As shown in Figure 1, in a kind of HVDC (High Voltage Direct Current) transmission system that the present invention proposes, comprising:
The converting plant 1 of two group of 12 pulse conversion device series connection, 2 and Inverter Station 1,2 in, every group of 12 pulse conversion device rated direct voltage 400kV, each station rated direct voltage 800kV.Inverter Station 3 is one group of 12 pulse conversion device, rated direct voltage 660kV.VSC current conversion station rated direct voltage 140kV.Two rated current 2000A of converting plant, Inverter Station 1 and 2 rated current 1500A, Inverter Station 3 and 4 rated current 1000A.
Converting plant 1,2 and Inverter Station 1,2 compose in parallel four end extra-high voltage DC transmission systems, after 660kV Inverter Station and VSC Inverter Station are connected each other, do as a whole in parallel with Inverter Station 2, by this series connection and method in parallel, reach the effect for VSC current conversion station dividing potential drop and current-sharing, realized the access of VSC.
The control thinking of mixing the multiterminal DC transmission system is identical with traditional multiterminal direct current transportation, selects a current conversion station to keep the direct voltage of the normal operation of system under parallel way, other current conversion station control direct currents; Under series system, kept the direct current of the normal operation of system by a current conversion station, all the other current conversion station control direct voltages.
For native system, converting plant 1 during steady operation, 2 and Inverter Station 1 all adopt and decide direct current control, Inverter Station 2 adopts decide extinguish angle and controls, as the voltage control station, 4 end extra-high voltage DC transmission systems can stable operation in this manner; Inverter Station 3 and VSC current conversion station are equivalent to series system, and two station electric currents equate that Inverter Station 3 adopts decides direct current control, can adjust the direct current at flow through Inverter Station 3 and VSC station by its control.VSC adopts at the station and decides direct voltage and alternating voltage control mode, and wherein, the control of alternating voltage phase place can realize by the index of modulation that changes modulating wave; The control of direct voltage can realize by the phase place that changes modulating wave.
The transmission system of the present invention's design, control direct voltage by a current conversion station in the parallel system, by LCC current conversion station control direct current, no matter VSC current conversion station control direct voltage is the stability that series arm or parallel system all can be kept direct voltage and direct current in the series arm.
The advantage of this structure is: two ultra high voltage converting plants have very big transmission capacity, the electric energy in contiguous large-scale energy base can be put together and be sent to distant place load center; Inverter Station 1 and Inverter Station 2 can be given high large scale industry center, the densely populated urban electricity supply of electricity needs equally as the ultra high voltage current conversion station; And the access of VSC current conversion station can realize sending to passive systems such as weak AC system or isolated islands.
The present invention also can adjust according to concrete engineering, and each current conversion station all disposes converter transformer, alternating current filter, DC filter, smoothing reactor.
Should be noted that at last: above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit, although with reference to above-described embodiment the present invention is had been described in detail, those of ordinary skill in the field are to be understood that: still can make amendment or be equal to replacement the specific embodiment of the present invention, and do not break away from any modification of spirit and scope of the invention or be equal to replacement, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (12)
1. multiterminal HVDC transmission system, described system comprises ultra high voltage converting plant and ultra high voltage Inverter Station, it is characterized in that described system is for the high-voltage large-capacity long distance power transmission with to the electrical network commutation converter LCC of weak AC system or the power supply of passive system load center and the six end connection in series-parallel mixed type one pole DC transmission system that voltage source converter VSC constitutes.
2. a kind of multiterminal HVDC transmission system as claimed in claim 1 is characterized in that, the converter LCC of described electrical network commutation-Line Commutation Converter is the converter based on thyristor; VSC-Voltage Source Converter is the converter of controlling turn-off device based on IGBT entirely.
3. a kind of multiterminal HVDC transmission system as claimed in claim 1 is characterized in that, described system comprises all the other LCC ends in parallel with the VSC series arm with LCC.
4. a kind of multiterminal HVDC transmission system as claimed in claim 1 is characterized in that, described system comprises two ultra high voltage converting plants and two ultra high voltage Inverter Station of two group of 12 pulse conversion device series connection.
5. a kind of multiterminal HVDC transmission system as claimed in claim 1 is characterized in that, and is in parallel with all the other ultra high voltage Inverter Station after superhigh pressure Inverter Station in the described system and the series connection of VSC Inverter Station, is used to VSC current conversion station dividing potential drop and current-sharing.
6. a kind of multiterminal HVDC transmission system as claimed in claim 1 is characterized in that, the ultra high voltage current conversion station is used for the high-voltage large-capacity long distance power transmission.
7. a kind of multiterminal HVDC transmission system as claimed in claim 4 is characterized in that, described VSC Inverter Station is used for to weak AC system or the power supply of passive system load center.
8. a kind of multiterminal HVDC transmission system as claimed in claim 1 is characterized in that, one of described ultra high voltage converting plant and two ultra high voltage Inverter Station all adopt decides direct current control.
9. a kind of multiterminal HVDC transmission system as claimed in claim 1 is characterized in that, described another ultra high voltage Inverter Station adopts decides extinguish angle control, as the voltage control station.
10. a kind of multiterminal HVDC transmission system as claimed in claim 1 is characterized in that, superhigh pressure Inverter Station in the described series arm adopts decide direct current control, is used for control and adjusts the direct current that flow through this Inverter Station and VSC stand.
11. a kind of multiterminal HVDC transmission system as claimed in claim 1 is characterized in that, described VSC Inverter Station adopts decides direct voltage and decides alternating voltage control.
12. as claimed in claim 11ly decide direct voltage and decide alternating voltage control, it is characterized in that, control alternating voltage by the index of modulation that changes modulating wave; By changing the phase control direct voltage of modulating wave.
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Cited By (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 |
| CN105262125A (en) * | 2015-11-12 | 2016-01-20 | 南方电网科学研究院有限责任公司 | Hybrid direct current transmission topological system |
| CN105281354A (en) * | 2014-06-06 | 2016-01-27 | 南方电网科学研究院有限责任公司 | Method of DC power transmission inversion side for accessing to AC system |
| WO2016091060A1 (en) * | 2014-12-11 | 2016-06-16 | 南京南瑞继保电气有限公司 | Method for inhibiting multiple converter stations into passive control mode in island state |
| CN106451516A (en) * | 2016-08-27 | 2017-02-22 | 许继集团有限公司 | DC fault crossing method for hybrid multiterminal HVDC system |
| CN106712071A (en) * | 2017-01-24 | 2017-05-24 | 特变电工新疆新能源股份有限公司 | Method and device for controlling high/low valve type flexible direct-current transmission system |
| 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 |
| 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 |
| WO2019109842A1 (en) * | 2017-12-07 | 2019-06-13 | 南京南瑞继保电气有限公司 | Coordinated control method and device for series voltage source converter valve group |
| US10861657B2 (en) | 2015-08-05 | 2020-12-08 | Abb Power Grids Switzerland Ag | Bidirectional power valve and control method therefor and hybrid multi-terminal HVDC system using the same |
| CN113452276A (en) * | 2021-06-03 | 2021-09-28 | 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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Cited By (22)
| 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 |
| CN105281354A (en) * | 2014-06-06 | 2016-01-27 | 南方电网科学研究院有限责任公司 | Method of DC power transmission inversion side for accessing to AC system |
| WO2016091060A1 (en) * | 2014-12-11 | 2016-06-16 | 南京南瑞继保电气有限公司 | Method for inhibiting multiple converter stations into passive control mode in island state |
| CN105743136A (en) * | 2014-12-11 | 2016-07-06 | 南京南瑞继保电气有限公司 | Method for inhibiting multiple converter stations from entering passive control mode at island state |
| US10218184B2 (en) | 2014-12-11 | 2019-02-26 | Nr Electric Co., Ltd. | Method for inhibiting multiple inverter stations from entering passive control mode in island state |
| 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 |
| US10861657B2 (en) | 2015-08-05 | 2020-12-08 | Abb Power Grids Switzerland Ag | Bidirectional power valve and control method therefor and hybrid multi-terminal HVDC system using the same |
| CN105262125A (en) * | 2015-11-12 | 2016-01-20 | 南方电网科学研究院有限责任公司 | Hybrid direct current transmission topological system |
| 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 |
| CN106451516A (en) * | 2016-08-27 | 2017-02-22 | 许继集团有限公司 | DC fault crossing method for hybrid multiterminal HVDC 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 |
| CN106712071A (en) * | 2017-01-24 | 2017-05-24 | 特变电工新疆新能源股份有限公司 | Method and device for controlling high/low valve type flexible direct-current 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 |
| WO2019109842A1 (en) * | 2017-12-07 | 2019-06-13 | 南京南瑞继保电气有限公司 | Coordinated control method and device for series voltage source converter valve group |
| KR20200044136A (en) * | 2017-12-07 | 2020-04-28 | 엔알 일렉트릭 컴퍼니 리미티드 | Method and apparatus for cooperative control of series voltage source converter valve group |
| KR102136513B1 (en) | 2017-12-07 | 2020-07-21 | 엔알 일렉트릭 컴퍼니 리미티드 | Method and apparatus for cooperative control of a group of series voltage source converter valves |
| US11146071B2 (en) | 2017-12-07 | 2021-10-12 | Nr Electric Co., Ltd. | Coordinated control method and device for series voltage source converter valve group |
| CN113452276A (en) * | 2021-06-03 | 2021-09-28 | 华中科技大学 | CCC-PHC type hybrid cascade direct current converter, rectifying station, inverter station and power transmission system |
| 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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