CN203071586U - Flexible direct-current power transmission system - Google Patents
Flexible direct-current power transmission system Download PDFInfo
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- CN203071586U CN203071586U CN2012206208705U CN201220620870U CN203071586U CN 203071586 U CN203071586 U CN 203071586U CN 2012206208705 U CN2012206208705 U CN 2012206208705U CN 201220620870 U CN201220620870 U CN 201220620870U CN 203071586 U CN203071586 U CN 203071586U
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 44
- 230000008859 change Effects 0.000 claims description 18
- 239000003990 capacitor Substances 0.000 claims description 6
- 238000001914 filtration Methods 0.000 abstract description 4
- 238000011161 development Methods 0.000 description 8
- 230000005611 electricity Effects 0.000 description 6
- 230000007812 deficiency Effects 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
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- 238000010586 diagram Methods 0.000 description 2
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- 230000009286 beneficial effect Effects 0.000 description 1
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- 230000002950 deficient Effects 0.000 description 1
- 238000013461 design Methods 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
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
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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 discloses a flexible direct-current power transmission system which comprises a first alternating current system and a second alternating current system; a first converter transformer, a first converter reactor, a first voltage source converter, a second voltage source converter, a second converter reactor and a second converter transformer are sequentially connected between the first alternating current system and the second alternating current system; and direct-current power transmission lines are arranged between the first voltage source converter and the second voltage source converter. According to the technical scheme of the utility model, the converter transformers and the converter reactors at an alternating current side play the roles of an energy exchange link between the voltage source converters and the alternating current systems and filtering; filters at the alternating current side are used for filtering harmonic waves at the alternating current side and have stable direct-current power transmission performance; and flexible direct-current power transmission generally adopts an underground or submarine cable, and the impact on the surrounding environment is very small.
Description
Technical field
The utility model relates to the direct current transportation technical field, is specifically related to a kind of flexible DC power transmission system.
Background technology
Along with science and technology development, up to the present, electric power transfer has experienced direct current, interchange and alternating current-direct current and has mixed the transmission of electricity three phases.Early stage power transmission engineering still owing to can not directly boost to direct current, makes transmission distance be subjected to bigger restriction from DC transmission system, can not satisfy the requirement that transmission capacity increases and transmission distance increases.
Invented threephase alternator and transformer the end of the eighties in 19 century, ac transmission has just replaced direct current transportation at large, and is developed rapidly, forms the blank of modern AC electrical network gradually.The research success of power current inverter, for high voltage direct current transmission has been broken through technical obstacle, so direct current transportation is subject to people's attention again.Direct current transportation is compared ac transmission and is had certain advantage in some aspects, since connecting the first in the world bar high voltage direct current transmission (HVDC) circuit between Gothland and the Sweden continent and build up the 1950's, HVDC is obtaining using widely in a lot of engineering practices, as asynchronous contact between remote high-power transmission of electricity, submarine cable transmission of electricity, two AC system etc.At present, realize asynchronous networking by DC transmission system between domestic existing a plurality of Da Qu: the coming years, south electric network will build up maximum in the world many feed-ins direct current system; The northeast electrical network also has many DC power transmission line building or including in planning.It is the main development trend of modern power network that alternating current-direct current mixes transmission of electricity.
Through for many years research and engineering practice work, the HVDC technology is enhanced, reduce the wastage, aspect such as control and resist technology obtained significant progress.But HVDC still exists some intrinsic defectives in application: the receiving end network must be an active system, can not power to passive system; Commutation failure when powering, the system of capacity of short circuit deficiency is easily taking place; Converter needs the special filter of configuration originally as a harmonic source, has increased equipment investment and has made expense relative higher with occupation of land; Simultaneously, absorb more reactive power etc. in the running.Although people have carried out continuous improvement to traditional HVDC technology of transmission of electricity, these corrective measures all can not fundamentally solve the deficiency of traditional HVDC transmission system.
Though the electric power system of first historically practicality adopts direct current transportation, but because at the electric power industry development initial stage, direct current transportation is compared with ac transmission and is had a lot of inferior positions, as flexible transformation ability, voltage is low, loss is big, networked capabilities is poor, supply district is little, transmission of electricity and power consumption equipment complexity, maintenance is big and cost is high, causes the development of direct current transportation slower.In a very long time, direct current transportation all is in a disadvantageous position, and the ac transmission development rapidly, occupied the leading position of power industry.But along with constantly developing of electric power system, grid contact is increasingly sophisticated, AC system has also exposed some its intrinsic characteristics, particularly exchange the restriction that long distance power transmission is subjected to synchronous operation stability, the direct current transportation technology is paid attention to again for people again, thereby promotes the fast development of direct current transportation technology.Because each link overwhelming majority of power transmission and distribution of sending out of electric power system is alternating current, adopt direct current transportation, just must solve change of current problem, therefore, the development of direct current transportation technology is mainly reflected in the development and change of change of current device.Evolution according to the difference direct current transportation technology as can be seen of change of current device.
The utility model content
The utility model has overcome the deficiencies in the prior art, and the flexible DC power transmission system is provided, and has good transmission performance.
Consider the problems referred to above of prior art, according to an aspect of the present utility model, for solving above-mentioned technical problem, the utility model by the following technical solutions:
A kind of flexible DC power transmission system comprises:
First AC system;
Second AC system;
Be connected with first converter transformer, first change of current reactor, first voltage source converter, second voltage source converter, second change of current reactor and second converter transformer between described first AC system and second AC system in turn;
Be DC transmission line between described first voltage source converter and second voltage source converter.
In order to realize the utility model better, further technical scheme is:
Among one of them embodiment of the utility model, pass through the first filter ground connection between described first converter transformer and first change of current reactor.
Among one of them embodiment of the utility model, pass through the second filter ground connection between described second change of current reactor and second converter transformer.
The utility model can also be:
Among one of them embodiment of the utility model, described first voltage source converter and second voltage source converter comprise full control converter bridge, dc bus capacitor device separately, should include a plurality of insulated gate bipolar transistor IGBTs or GTO GTO by complete each brachium pontis of controlling converter bridge, this dc bus capacitor device supports for converter provides voltage.
Compared with prior art, one of the beneficial effects of the utility model are:
In the technical solution of the utility model, exchange side converter transformer and change of current reactor and play energy exchange tie and filter action between voltage source converter and AC system; The effect of wave filter on AC side is that filtering exchanges the side harmonic wave, has stable direct current transportation performance; Underground or the submarine cable of the general employing of flexible DC power transmission,
Very little to the influence that surrounding environment produces.
Description of drawings
For clearer explanation present specification embodiment or technical scheme of the prior art, to do simple the introduction to the accompanying drawing of required use in the description of embodiment or prior art below, apparently, the accompanying drawing that describes below only is the reference to some embodiment in the present specification, for those skilled in the art, under the situation of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 shows the flexible DC power transmission system principle schematic diagram according to an embodiment of the utility model.
Embodiment
Be described in further detail below in conjunction with the utility model of embodiment, but execution mode of the present utility model is not limited thereto.
Fig. 1 shows the flexible DC power transmission system principle schematic diagram according to an embodiment of the utility model.An embodiment with reference to a kind of flexible DC power transmission shown in Figure 1 system comprises:
First AC system 1;
Be connected with first converter transformer 3, first change of current reactor 4, the first voltage source converter VSC1, the second voltage source converter VSC2, second change of current reactor 5 and second converter transformer 6 between described first AC system 1 and second AC system 2 in turn;
Be DC transmission line 7 between the described first voltage source converter VSC1 and the second voltage source converter VSC2.
Pass through first filter, 8 ground connection between described first converter transformer 3 and first change of current reactor 4.
Pass through second filter, 9 ground connection between described second change of current reactor 5 and second converter transformer 6.
The described first voltage source converter VSC1 and the second voltage source converter VSC2 comprise full control converter bridge, dc bus capacitor device separately, can satisfy the capacity requirement under certain technical conditions; Should include a plurality of insulated gate bipolar transistor IGBTs or GTO GTO by complete each brachium pontis of controlling converter bridge, this dc bus capacitor device supports for converter provides voltage, and the stable of direct voltage is the assurance of whole converter reliably working.Exchange side converter transformer 3,6 and change of current reactor 5,5 and play energy exchange tie and filter action between voltage source converter VSC1, VSC2 and AC system; Wave filter on AC side 8,9 effect are that filtering exchanges the side harmonic wave, have stable direct current transportation performance; Underground or the submarine cable of the general employing of flexible DC power transmission is very little to the influence that surrounding environment produces.
Each embodiment adopts the mode of going forward one by one to describe in this specification, and what each embodiment stressed is and the difference of other embodiment that identical similar part cross-references gets final product between each embodiment.
" embodiment " who speaks of in this manual, " another embodiment ", " embodiment ", etc., refer to concrete feature, structure or the characteristics described in conjunction with this embodiment and be included among at least one embodiment that the application's generality describes.A plurality of local appearance statement of the same race is not necessarily to refer to same embodiment in specification.Furthermore, when describing a concrete feature, structure or characteristics in conjunction with arbitrary embodiment, what advocate is to realize that in conjunction with other embodiment this feature, structure or characteristics also drop in the scope of the present utility model.
Although be described with reference to the utility model of a plurality of explanatory embodiment of the present utility model here, but, should be appreciated that, those skilled in the art can design a lot of other modification and execution modes, and these are revised and execution mode will drop within the disclosed principle scope and spirit of the application.More particularly, in the scope of, accompanying drawing open in the application and claim, can carry out multiple modification and improvement to building block and/or the layout of subject combination layout.Except modification that building block and/or layout are carried out with improving, to those skilled in the art, other purposes also will be tangible.
Claims (4)
1. a flexible DC power transmission system is characterized in that, comprising:
First AC system;
Second AC system;
Be connected with first converter transformer, first change of current reactor, first voltage source converter, second voltage source converter, second change of current reactor and second converter transformer between described first AC system and second AC system in turn;
Be DC transmission line between described first voltage source converter and second voltage source converter.
2. flexible DC power transmission according to claim 1 system is characterized in that, between described first converter transformer and first change of current reactor by the first filter ground connection.
3. flexible DC power transmission according to claim 1 system is characterized in that, between described second change of current reactor and second converter transformer by the second filter ground connection.
4. flexible DC power transmission according to claim 1 system, it is characterized in that, described first voltage source converter and second voltage source converter comprise full control converter bridge, dc bus capacitor device separately, should include a plurality of insulated gate bipolar transistor IGBTs or GTO GTO by complete each brachium pontis of controlling converter bridge, this dc bus capacitor device supports for converter provides voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012206208705U CN203071586U (en) | 2012-11-22 | 2012-11-22 | Flexible direct-current power transmission system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012206208705U CN203071586U (en) | 2012-11-22 | 2012-11-22 | Flexible direct-current power transmission system |
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| Publication Number | Publication Date |
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| CN203071586U true CN203071586U (en) | 2013-07-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2012206208705U Expired - Lifetime CN203071586U (en) | 2012-11-22 | 2012-11-22 | Flexible direct-current power transmission system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106253319A (en) * | 2016-08-21 | 2016-12-21 | 国家电网公司 | A kind of grounded circuit of low-voltage direct power distribution network based on flexible direct current networking technology |
-
2012
- 2012-11-22 CN CN2012206208705U patent/CN203071586U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106253319A (en) * | 2016-08-21 | 2016-12-21 | 国家电网公司 | A kind of grounded circuit of low-voltage direct power distribution network based on flexible direct current networking technology |
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| C14 | Grant of patent or utility model | ||
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| CX01 | Expiry of patent term |
Granted publication date: 20130717 |
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| CX01 | Expiry of patent term |