CN203839973U - Standby-type bipolar direct-current power transmission circuit - Google Patents

Standby-type bipolar direct-current power transmission circuit Download PDF

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Publication number
CN203839973U
CN203839973U CN201420246413.3U CN201420246413U CN203839973U CN 203839973 U CN203839973 U CN 203839973U CN 201420246413 U CN201420246413 U CN 201420246413U CN 203839973 U CN203839973 U CN 203839973U
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China
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circuit
switch
utmost point
conversion device
pulse conversion
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CN201420246413.3U
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Chinese (zh)
Inventor
周德生
王之浩
鲍伟
崔勇
赵丹丹
肖嵘
张嘉旻
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State Grid Shanghai Electric Power Co Ltd
East China Power Test and Research Institute Co Ltd
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State Grid Shanghai Electric Power Co Ltd
East China Power Test and Research Institute Co Ltd
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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
    • Y02E40/30—Reactive power compensation
    • 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
    • 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 relates to a standby-type bipolar direct-current power transmission circuit. The standby-type bipolar direct-current power transmission circuit is used for connecting a transmitting-end alternating current power grid with a receiving-end alternating current power grid. The standby-type bipolar direct-current power transmission circuit includes a pole 1 circuit, a pole 2 circuit, a pole 3 circuit, an alternating current filter ACF1, an alternating current filter ACF2, a reactive power compensation device QC1 and a reactive power compensation device QC2; the input end of the pole 1 circuit is connected with the positive pole of the transmitting-end alternating current power grid; the output end of the pole 1 circuit is connected with the positive pole of the receiving-end alternating current power grid; the input end of the pole 2 circuit is connected with the negative pole of the transmitting-end alternating current power grid; the output end of the pole 2 circuit is connected with the negative pole of the receiving-end alternating current power grid; and the input end and the output end of the pole 3 circuit are respectively connected with the pole 1 circuit and the pole 2 circuit. Compared with the prior art, the standby-type bipolar direct-current power transmission circuit of the utility model has the advantages of full utilization of original line resources, low cost, increased power transmission capacity and the like.

Description

A kind of standby mode bipolar direct current transmission circuit
Technical field
The utility model relates to a kind of direct current transportation circuit, especially relates to a kind of standby mode bipolar direct current transmission circuit.
Background technology
Along with Southwestern China water power, the further deep development of northwest coal electricity and external Energy Base, the sustainable development of national economy simultaneously, inevitable more and more higher to the requirement of electric network performance, to provide enough electric energy on the one hand, to ensure the quality of power supply on the one hand, promoting the transmission capacity of electrical network and the safe and stable operation ability of electrical network is an imperative job, simultaneously, if adopt newly-built new power plant, set up bookstore's circuit of type, build other related facilities such as new transformer station, to make work become extremely difficult, time-consuming and expensive, so wish again to utilize limited investment to upgrade to electric power system infrastructure, utilize original high-voltage alternating exhibition and circuit rack, transform and be converted into DC transmission engineering.
Hand at present and change direct current transportation method and have three utmost point DC power transmission systems bipolar direct current transmission system of unifying, they all use original transmission line and insulator arrangement, but making full use of Article 3 transmission line, three utmost point DC transmission system increase the transmission line capability of system, compare bipolar direct current transmission, the electric energy of three extremely many transmission 37%, but the converter of three utmost point direct currents is except 4 converters on the utmost point 1 and the utmost point 2, on the utmost point 3, also need 2 converters, so, the investment of three utmost point DC transmission system is almost the twice of bipolar DC, under economic benefit, limit engineering using value, seek a kind of bipolar direct current transmission topological structure, can there is direct current system controlled fast, systematic function is high, improve the advantages such as transmission line capability, can be issued at limited fund condition again the doulbe-sides' victory of effect and interests.
Chinese patent 201310507288.7X discloses a kind of expanded type bipolar direct current transmission system, comprise rectification current conversion station, rectification side current conversion unit, three utmost point transmission lines, inversion side current conversion unit and inversion current conversion station, there is the shortcoming that uses that device is many, cost is higher, power system capacity comparing calculation explanation is not known etc. in this invention.
Summary of the invention
The purpose of this utility model is exactly to provide a kind of standby mode bipolar direct current transmission circuit that former line resource, small investment and transmission line capability increase that makes full use of in order to overcome the defect that above-mentioned prior art exists.
The purpose of this utility model can be achieved through the following technical solutions:
A kind of standby mode bipolar direct current transmission circuit, for connecting sending end AC network and receiving end AC network, comprises the utmost point 1 circuit, the utmost point 2 circuit, the utmost point 3 circuit, alternating current filter ACF 1, alternating current filter ACF 2, reactive-load compensation equipment Q c1with reactive-load compensation equipment Q c2the input of the described utmost point 1 circuit connects the positive pole of sending end AC network, output connects the positive pole of receiving end AC network, the input of the described utmost point 2 circuit connects the negative pole of sending end AC network, output connects the negative pole of receiving end AC network, the described utmost point 3 circuit input and output two ends are connected with the utmost point 2 circuit with the utmost point 1 circuit respectively, described alternating current filter ACF 1with reactive-load compensation equipment Q c1one end connect respectively the output of sending end AC network, the other end connects respectively the earth, described alternating current filter ACF 2with reactive-load compensation equipment Q c2one end connect respectively the input of receiving end AC network, the other end connects respectively the earth.
The described utmost point 1 circuit comprises converter transformer T 11, converter transformer T 12, 12 pulse conversion device 2p 11, 12 pulse conversion device 2p 12, switch S 11and switch S 12, described converter transformer T 11input connect the positive pole of sending end AC network, output connects the anode of 12 pulse conversion device 2p11,12 described pulse conversion device 2p 11negative electrode respectively with switch S 11one end be connected with the utmost point 3 circuit, neutral point connects respectively the earth and the utmost point 2 circuit, described switch S 11the other end by the utmost point 1 DC power transmission line and switch S 12one end be connected, described switch S 12the other end connect 12 pulse conversion device 2p 12anode, 12 described pulse conversion device 2p 12negative electrode connect converter transformer T 12input, neutral point connects and meets respectively the earth and the utmost point 2 circuit, described converter transformer T 12output connect the positive pole of receiving end AC network.
The described utmost point 2 circuit comprise converter transformer T 21, converter transformer T 22, 12 pulse conversion device 2p 21, 12 pulse conversion device 2p 22, switch S 21and switch S 22, described converter transformer T 21input connect the negative pole of sending end AC network, output connects 12 pulse conversion device 2p 21anode, 12 described pulse conversion device 2p 21negative electrode respectively with switch S 21one end be connected with the utmost point 3 circuit, neutral point connects respectively the earth and 12 pulse conversion device 2p 11neutral point, described switch S 21the other end by the utmost point 2 DC power transmission line and switch S 22one end be connected, described switch S 22the other end connect 12 pulse conversion device 2p 22anode, 12 described pulse conversion device 2p 22negative electrode connect converter transformer T 22input, neutral point connects and meets respectively the earth and 12 pulse conversion device 2p 12neutral point, described converter transformer T 22output connect the negative pole of receiving end AC network.
The described utmost point 3 circuit comprise switch S 31, switch S 32, switch S 41and switch S 42, described switch S 31one end connect 12 pulse conversion device 2p 11negative electrode, the other end is by the utmost point 3 DC power transmission line and switch S 32one end be connected, described switch S 32the other end and 12 pulse conversion device 2p 12anode be connected, described switch S 41one end connect 12 pulse conversion device 2p 21anode, the other end is by the utmost point 3 DC power transmission line and switch S 42one end be connected, described switch S 42the other end and 12 pulse conversion device 2P 22negative electrode be connected.
Described reactive-load compensation equipment adopts power factor correction capacitor series connection low tension reactor.
Described alternating current filter adopts HP12/24 double-tuned filter or HP3 single tuned filter.
Compared with prior art, the utlity model has following advantage:
1) the utility model has adopted 12 pulse conversion devices to remove the harmonic current that rectifier produces, and converting plant and adverse current station are respectively equipped with reactive-load compensation equipment and alternating current filter simultaneously, and transmission system has been carried out to inactivity compensation and ac filter.Because rectifier is being converted to alternating current the galvanic while, produce a large amount of harmonic current injections in electrical network, the thing followed is exactly the impact that harmonic current produces other load in electrical network, adopts 12 pulse converters can eliminate H5, H7 subharmonic.
2) the utility model adopts standby mode bipolar direct current transmission topological structure, using the utmost point 3 circuits as transmission route for subsequent use, realize the bipolar direct current transmission of 3 kinds of operational modes, transmission line capability increases, operational mode is flexible, can continue the bipolar DC control that follows conventional lines: rectifier is determined Current Control, inverter closes the minimum trigger angle restriction of angle of rupture control, rectifier and the VDCOL restriction of determining Current Control and both sides current conversion station of inverter, and isochrone pipeline equipment utilance is high, small investment.
Brief description of the drawings
Fig. 1 is standby mode bipolar direct current transmission circuit diagram;
Fig. 2 is HP12/24 double-tuned filter topology diagram;
Fig. 3 is HP3 single tuned filter topology diagram;
Fig. 4 is conventional bipolar direct current transmission control characteristic of steady state schematic diagram.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is elaborated.The present embodiment is implemented as prerequisite taking technical solutions of the utility model, provided detailed execution mode and concrete operating process, but protection range of the present utility model is not limited to following embodiment.
As shown in Figure 1, a kind of standby mode bipolar direct current transmission circuit, for connecting sending end AC network and receiving end AC network, comprises the utmost point 1 circuit, the utmost point 2 circuit, the utmost point 3 circuit, alternating current filter ACF 1, alternating current filter ACF 2, reactive-load compensation equipment Q c1with reactive-load compensation equipment Q c2the input of the utmost point 1 circuit connects the positive pole of sending end AC network, output connects the positive pole of receiving end AC network, the input of the utmost point 2 circuit connects the negative pole of sending end AC network, output connects the negative pole of receiving end AC network, the utmost point 3 circuit input and output two ends are connected with the utmost point 2 circuit with the utmost point 1 circuit respectively, alternating current filter ACF 1with reactive-load compensation equipment Q c1one end connect respectively the output of sending end AC network, the other end connects respectively the earth, alternating current filter ACF 2with reactive-load compensation equipment Q c2one end connect respectively the input of receiving end AC network, the other end connects respectively the earth.
The utmost point 1 circuit comprises converter transformer T 11, converter transformer T 12, 12 pulse conversion device 2p 11, 12 pulse conversion device 2p 12, switch S 11and switch S 12, converter transformer T 11input connect the positive pole of sending end AC network, output connects 12 pulse conversion device 2p 11anode, 12 pulse conversion device 2p 11negative electrode respectively with switch S 11one end be connected with the utmost point 3 circuit, neutral point connects respectively the earth and the utmost point 2 circuit, switch S 11the other end by the utmost point 1 DC power transmission line and switch S 12one end be connected, switch S 12the other end connect 12 pulse conversion device 2p 12anode, 12 pulse conversion device 2P 12negative electrode connect converter transformer T 12input, neutral point connects and meets respectively the earth and the utmost point 2 circuit, converter transformer T 12output connect the positive pole of receiving end AC network.
The utmost point 2 circuit comprise converter transformer T 21, converter transformer T 22, 12 pulse conversion device 2P 21, 12 pulse conversion device 2P 22, switch S 21and switch S 22, converter transformer T 21input connect the negative pole of sending end AC network, output connects 12 pulse conversion device 2P 21anode, 12 pulse conversion device 2P 21negative electrode respectively with switch S 21one end be connected with the utmost point 3 circuit, neutral point connects respectively the earth and 12 pulse conversion device 2p 11neutral point, switch S 21the other end by the utmost point 2 DC power transmission line and switch S 22one end be connected, switch S 22the other end connect 12 pulse conversion device 2P 22anode, 12 pulse conversion device 2P 22negative electrode connect converter transformer T 22input, neutral point connects and meets respectively the earth and 12 pulse conversion device 2P 12neutral point, converter transformer T 22output connect the negative pole of receiving end AC network.
The utmost point 3 circuit comprise switch S 31, switch S 32, switch S 41and switch S 42, switch S 31one end connect 12 pulse conversion device 2p 11negative electrode, the other end is by the utmost point 3 DC power transmission line and switch S 32one end be connected, switch S 32the other end and 12 pulse conversion device 2p 12anode be connected, switch S 41one end connect 12 pulse conversion device 2p 21anode, the other end is by the utmost point 3 DC power transmission line and switch S 42one end be connected, switch S 42the other end and 12 pulse conversion device 2p 22negative electrode be connected.
Reactive-load compensation equipment adopts power factor correction capacitor series connection low tension reactor.
Alternating current filter adopts HP12/24 double-tuned filter or HP3 single tuned filter, as shown in Figure 2,3.
Transmission line of alternation current is transform as after standby mode bipolar direct current transmission, is exactly conventional bipolar direct current transmission, therefore according to the operational mode operation of conventional bipolar direct current transmission.
Adopt conventional bipolar DC control strategy, that is: rectifier is determined Current Control, inverter and is closed angle of rupture control, take into account the Current Control of determining of the minimum trigger angle restriction of rectifier and inverter, and the VDCOL of both sides current conversion station limits simultaneously.Under this control strategy regulates, DC transmission system control characteristic of steady state as shown in Figure 4.
Suppose: the rated direct current of every polar curve with exchange that rated current equates, DC rated voltage is with to exchange rated line voltage equal.
In the time disregarding circuit overload ability, the specified direct current transmission capacity of standby mode bipolar direct current transmission system is
P dBT＝2U dNI dN＝1.15P N (1)
In formula, exchange specified transmission power
Above formula shows, in the time disregarding circuit overload ability, the specified direct current transmission capacity of standby mode bipolar direct current transmission system is for exchanging 1.15 times of specified transmission power.
There are following 2 class operational modes in the utility model, in the time disregarding anti-power delivery and brownout operation, has following characteristics:
1) bipolar operational mode; Adopt conventional constant DC current control pattern.When normal operation, the utmost point 3 is as metallic return, without earth current; In the time of the utmost point 1 or the utmost point 2 line fault, the utmost point 3 replaces fault polar curve, and now earth current is the bipolar uneven direct current of not enough rated current 1%, has 3 kinds of operational modes.
2) monopole operating mode; The conventional constant DC current control pattern of same employing, is used two polar curves, and wherein a polar curve, as metallic return, does not exist earth current, has 3 kinds of operational modes.
As can be seen here, there are 2 class operational modes in standby mode bipolar direct current transmission system, has 6 kinds of concrete operational modes (disregarding anti-power delivery and brownout operation).When being operated in normal bipolar operational mode lower time, without earth current.

Claims (6)

1. a standby mode bipolar direct current transmission circuit, for connecting sending end AC network and receiving end AC network, is characterized in that, comprises the utmost point 1 circuit, the utmost point 2 circuit, the utmost point 3 circuit, alternating current filter ACF 1, alternating current filter ACF 2, reactive-load compensation equipment Q c1with reactive-load compensation equipment Q c2the input of the described utmost point 1 circuit connects the positive pole of sending end AC network, output connects the positive pole of receiving end AC network, the input of the described utmost point 2 circuit connects the negative pole of sending end AC network, output connects the negative pole of receiving end AC network, the described utmost point 3 circuit input and output two ends are connected with the utmost point 2 circuit with the utmost point 1 circuit respectively, described alternating current filter ACF 1with reactive-load compensation equipment Q c1one end connect respectively the output of sending end AC network, the other end connects respectively the earth, described alternating current filter ACF 2with reactive-load compensation equipment Q c2one end connect respectively the input of receiving end AC network, the other end connects respectively the earth.
2. a kind of standby mode bipolar direct current transmission circuit according to claim 1, is characterized in that, the described utmost point 1 circuit comprises converter transformer T 11, converter transformer T 12, 12 pulse conversion device 2p 11, 12 pulse conversion device 2p 12, switch S 11and switch S 12, described converter transformer T 11input connect the positive pole of sending end AC network, output connects 12 pulse conversion device 2p 11anode, 12 described pulse conversion device 2p 11negative electrode respectively with switch S 11one end be connected with the utmost point 3 circuit, neutral point connects respectively the earth and the utmost point 2 circuit, described switch S 11the other end by the utmost point 1 DC power transmission line and switch S 12one end be connected, described switch S 12the other end connect 12 pulse conversion device 2p 12anode, 12 described pulse conversion device 2p 12negative electrode connect converter transformer T 12input, neutral point connects and meets respectively the earth and the utmost point 2 circuit, described converter transformer T 12output connect the positive pole of receiving end AC network.
3. a kind of standby mode bipolar direct current transmission circuit according to claim 2, is characterized in that, the described utmost point 2 circuit comprise converter transformer T 21, converter transformer T 22, 12 pulse conversion device 2p 21, 12 pulse conversion device 2p 22, switch S 21and switch S 22, described converter transformer T 21input connect the negative pole of sending end AC network, output connects 12 pulse conversion device 2p 21anode, 12 described pulse conversion device 2p 21negative electrode respectively with switch S 21one end be connected with the utmost point 3 circuit, neutral point connects respectively the earth and 12 pulse conversion device 2p 11neutral point, described switch S 21the other end by the utmost point 2 DC power transmission line and switch S 22one end be connected, described switch S 22the other end connect 12 pulse conversion device 2p 22anode, 12 described pulse conversion device 2p 22negative electrode connect converter transformer T 22input, neutral point connects and meets respectively the earth and 12 pulse conversion device 2p 12neutral point, described converter transformer T 22output connect the negative pole of receiving end AC network.
4. a kind of standby mode bipolar direct current transmission circuit according to claim 3, is characterized in that, the described utmost point 3 circuit comprise switch S 31, switch S 32, switch S 41and switch S 42, described switch S 31one end connect 12 pulse conversion device 2p 11negative electrode, the other end is by the utmost point 3 DC power transmission line and switch S 32one end be connected, described switch S 32the other end and 12 pulse conversion device 2P 12anode be connected, described switch S 41one end connect 12 pulse conversion device 2P 21anode, the other end is by the utmost point 3 DC power transmission line and switch S 42one end be connected, described switch S 42the other end and 12 pulse conversion device 2p 22negative electrode be connected.
5. a kind of standby mode bipolar direct current transmission circuit according to claim 1, is characterized in that, described reactive-load compensation equipment adopts power factor correction capacitor series connection low tension reactor.
6. a kind of standby mode bipolar direct current transmission circuit according to claim 1, is characterized in that, described alternating current filter adopts HP12/24 double-tuned filter or HP3 single tuned filter.
CN201420246413.3U 2014-05-14 2014-05-14 Standby-type bipolar direct-current power transmission circuit Expired - Lifetime CN203839973U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103972918A (en) * 2014-05-14 2014-08-06 国网上海市电力公司 Standby type bipolar direct-current transmission circuit

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103972918A (en) * 2014-05-14 2014-08-06 国网上海市电力公司 Standby type bipolar direct-current transmission circuit
CN103972918B (en) * 2014-05-14 2016-10-05 国网上海市电力公司 Standby mode bipolar direct current transmission circuit

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