CN101976956A - Single-direction power-transmitted low-cost direct-current transmission system - Google Patents
Single-direction power-transmitted low-cost direct-current transmission system Download PDFInfo
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- CN101976956A CN101976956A CN 201010269822 CN201010269822A CN101976956A CN 101976956 A CN101976956 A CN 101976956A CN 201010269822 CN201010269822 CN 201010269822 CN 201010269822 A CN201010269822 A CN 201010269822A CN 101976956 A CN101976956 A CN 101976956A
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Abstract
The invention relates to a single-direction power-transmitted low-cost direct-current transmission system which has the characteristics of high reliability and low cost. The technical scheme is as follows: the single-direction power-transmitted low-cost direct-current transmission system has the structure that a diode rectifier, a direct-current transmission line containing a positive wire and a negative wire, and a modular multilevel current converter are orderly connected in series between the transmitting end system and the receiving end system; the diode rectifier comprises a rectiformer and a diode rectifier bridge; the primary side of the rectiformer is connected with the transmitting end system which provides active-power three-phase alternating current, and the secondary side is connected with the alternating current input end of the diode rectifier bridge; the positive pole of the diode rectifier bridge is connected with the positive pole of the direct-current transmission line, and the negative pole of the diode rectifier bridge is connected with the negative pole of the direct-current transmission line; and the modular multilevel current converter comprises a plurality of submodules (SM), a plurality of buffer reactors (3.2), and a phase reactor (3.3) or converter transformer.
Description
Technical field
The present invention relates to the direct current transportation technical field, be specifically related to the low cost DC transmission system that a kind of unidirectional power transmits.
Background technology
Since last century the fifties, high voltage dc transmission technology rises again, particularly based on the extensive use of device for high-power power electronic in DC transmission system, for electric power system has brought new development and growth point.Traditional high voltage direct current transmission adopts the current source type converter based on thyristor, has obtained at present using comparatively widely, as Zhoushan DC transmission engineering, Ge Zhou Ba-Shanghai DC transmission engineering, Xiang Jiaba-Shanghai DC transmission engineering etc.In the application scenario based on the high voltage direct current transmission of voltage-source type converter, having is one-way transmission power greatly, as: fields such as urban electricity supply, island power supply, offshore drilling platform power supply and distributed energy generating access.For requiring the quick control trend, the high quality of power supply, little to environmental impact, the middle low power direct current transportation application scenario that links to each other with weak receiving end or passive network then has advantage more based on the high voltage direct current transmission of voltage-source type converter.
At present, the voltage-source type converter often adopts full control devices such as igbt (IGBT), constitutes according to different circuit topologies, and these circuit topologies comprise three phase full bridge structure, diode-clamped and capacitor-clamped type etc.The voltage source converter that is used for the light high pressure direct current transportation often adopts the mode of full control switching tube series connection to improve the device electric pressure.But many switching tube series connection make static between pipe, dynamic voltage balancing difficulty increasing, and the converter reliability reduces.A kind of topology of new proposition is the modular multilevel voltage source converter, and quantity that can be by changing submodule to be adapting to different electric pressures and power requirement, and can improve the device redundancey degree easily, and its reliability is increased greatly; Simultaneously, the converter level number can expand to a lot, thereby makes output voltage have less harmonic content, and reduces the devices switch frequency to reduce the wastage.But the full control device costs such as igbt (IGBT) that are used to make the voltage-source type converter are very high, and the localization rate of parts and components is low.
Summary of the invention
Purpose of the present invention aims to provide a kind of DC transmission system that requires unidirectional power to transmit that is applicable to, this system should have reliability height, characteristics that cost is low.
Technical scheme provided by the invention is: the low cost DC transmission system that a kind of unidirectional power transmits is characterized in that this system comprises: be connected in series diode rectifier successively between sending and receiving-end system, contain the DC power transmission line and the modularization multi-level converter of positive pole and two leads of negative pole;
Described diode rectifier comprises rectifier transformer and diode rectifier bridge; The former limit of rectifier transformer links to each other with the sending of the three-phase alternating current that active power is provided, and secondary links to each other with the ac input end of diode rectifier bridge; The positive pole of diode rectifier bridge links to each other with the positive pole of DC power transmission line, and the negative pole of diode rectifier bridge links to each other with the negative pole of DC power transmission line;
Described modularization multi-level converter comprises a plurality of submodules (SM), and several cushion reactor (3.2), also has phase reactor (3.3) or converter transformer; A plurality of submodules are in series and form the three phase full bridge structure, and the positive pole of three phase full bridge structure links to each other with the positive pole of DC power transmission line, and the negative pole of three phase full bridge structure links to each other with the negative pole of DC power transmission line; Each half-bridge arm of three phase full bridge structure buffering reactor of all connecting; One end of phase reactor or converter transformer links to each other with the end that exchanges of three phase full bridge structure, and the other end links to each other with the three-phase alternating current receiving-end system of accepting active power.
Described submodule, form half H bridge circuit by first switching tube of position and last brachium pontis and inverse parallel at second switching tube and second diode of inverse parallel on second switching tube of first diode on first switching tube and position and following brachium pontis, the positive pole of half H bridge circuit links to each other with the positive pole of dc capacitor, and negative pole links to each other with the negative pole end of dc capacitor.
Described diode rectifier bridge is three-phase 6 pulse wave rectifier bridges, or six phases, 12 pulse wave rectifier bridges, or other diodes are not controlled rectifier bridge.
Beneficial effect of the present invention is: the low cost DC transmission system that the unidirectional power of being invented transmits, system's sending end adopts not control rectifier of diode, system's receiving end adopts modularization multi-level converter, be applicable to the application scenario of the power one-way transmission that extensively exists in the DC transmission system, have the advantage that cost is low, reliability is high.Compare with the voltage-source type converter, significantly reduced the use amount of full control devices such as igbt (IGBT), effectively reduce cost.
Description of drawings
Fig. 1 is the low cost DC transmission system structural representation that unidirectional power transmits.
Fig. 2 is the sub modular structure schematic diagram.
Fig. 3 is a computer artificial result oscillogram one.0～1.0 second modularization multi-level converter voltage of emulation V wherein
C(the A phase of only drawing), converter electric current I
CThe meritorious P of (the A phase of only drawing), converter output, converter are exported idle Q, diode rectifier side DC line voltage V
DC1, modularization multi-level converter side DC line voltage V
DC2And DC line electric current I
DC
Fig. 4 is a computer artificial result oscillogram two.0.8～1.0 second modularization multi-level converter voltage of emulation V wherein
C(three-phase), converter electric current I
C(three-phase), converter bridge arm electric current I
LEG(A that only draws goes up brachium pontis mutually) and submodule capacitance voltage V
DC-A(A that only draws goes up first submodule of brachium pontis mutually).
Embodiment
In conjunction with Fig. 1, the low cost DC transmission system that unidirectional power provided by the invention transmits comprises: be connected in series diode rectifier 1 successively between sending and receiving-end system, contain the DC power transmission line 2 and the modularization multi-level converter 3 of positive pole and two leads of negative pole.
Described diode rectifier 1 comprises: rectifier bridge 1.1 and rectifier transformer 1.2.The positive pole of diode rectifier bridge 1.1 links to each other with the positive pole of DC power transmission line 2, the negative pole of rectifier bridge 1.1 links to each other with the negative pole of DC power transmission line 2, rectifier bridge 1.1 can be three-phase 6 pulse wave rectifier bridges, also can be six phases, 12 pulse wave rectifier bridges, or other diodes is not controlled rectifier bridge.In the illustrated example with six mutually 12 pulse wave diode rectifier bridges be example; The former limit of rectifier transformer 1.2 (is example with YY Δ type three-winding transformer) links to each other with the three-phase alternating current sending A that active power is provided, and secondary links to each other with the ac input end of rectifier bridge 1.1.
Described modularization multi-level converter 3 comprises: submodule 3.1 (i.e. AM among the figure), buffering reactor 3.2 and reactor 3.3 mutually.Submodule 3.1 is in series and forms the three phase full bridge structure, and the positive pole of three phase full bridge structure links to each other with the positive pole of DC power transmission line 2, and negative pole links to each other with the negative pole of DC power transmission line 2, each half-bridge arm of three phase full bridge structure buffering reactor 3.2 of all connecting; Phase reactor 3.3 1 ends link to each other with the end that exchanges of three phase full bridge structure, the other end links to each other with the three-phase alternating current receiving-end system B that accepts active power, reactor 3.3 can be actual AC reactor (as shown in the figure), also can be the AC reactor that is formed by the converter transformer equivalence.
In conjunction with Fig. 2, submodule 3.1, form half H bridge circuit by first switching tube S1 of position and last brachium pontis and inverse parallel at second the switching tube S2 and second diode D2 of inverse parallel on second switching tube S2 of first diode D1 on first switching tube S1 and position and following brachium pontis, the positive pole of half H bridge circuit links to each other with the positive pole of dc capacitor C, and negative pole links to each other with the negative pole end of dc capacitor C.
Operation principle of the present invention is: diode rectifier bridge 1.1 is operated in does not control rectification state, from sending A absorbed power; The approximate alternating voltage that is proportional to sending A of rectifier bridge 1.1 DC side direct voltages; Direct current is flowed out by the positive pole (common cathode end) of rectifier bridge 1.1, the positive pole of the anodal injection module multilevel converter 3 by DC power transmission line 2, and flow out, and flow back to the negative pole (anode tap altogether) of rectifier bridge 1.1 through DC power transmission line 2 negative poles from the negative pole of modularization multi-level converter 3; By voltage, sense of current in the DC loop as can be known, diode rectifier 1 sends power, modularization multi-level converter 3 absorbed powers.
The switching tube S1 of submodule 3.1 is open-minded, and when switching tube S2 turn-offed, submodule 3.1 was the input state; The switching tube S2 of submodule 3.1 is open-minded, and when switching tube S3 turn-offed, submodule 3.1 was the excision state.Submodule 3.1 state why no matter, because the afterflow effect of diode D1, D2, electric current can flow through submodule 3.1 by any direction; When submodule 3.1 was the input state, submodule 3.1 was equivalent to dc capacitor C, and output DC holds the voltage of C; When submodule 3.1 was the excision state, submodule 3.1 was equivalent to short circuit, and output voltage is 0, and dc capacitor C excises out circuit.
Buffering reactor 3.2 plays the effect that buffer stream is crossed submodule 3.1 electric currents.
During work, the switching by each submodule 3.1 state can form three-phase alternating voltage in the AC side of modularization multi-level converter 3, and can keep the voltage of each dc capacitor C.Modularization multi-level converter 3 can inject the active power of adjustable size to receiving-end system B by the alternating voltage of control input phase reactor 3.3, the reactive power of can also independent regulation injecting or absorbing from receiving-end system B to receiving-end system B.
The Computer Simulation parameter of the low cost DC transmission system that unidirectional power transmits is: specified meritorious capacity 30WM, and idle 15WVar, sending A, receiving-end system B are Infinite bus system, electric pressure 35kV; Rectifier bridge 1.1 is that six phases, 12 pulse wave ideal diodes are not controlled rectifier bridge; Rectifier transformer 1.2 is the desirable three-winding transformer of YY Δ type; DC power transmission line 2 is the submarine cable circuit, length 100 kms; Modularization multi-level converter 3 is every to be made up of 160 submodules 3.1, each 80 of upper and lower bridge arms, the dc capacitor C of submodule 3.1 is 3000 microfarads, submodule 3.1 rated voltage 1kV, switching tube S1 and switching tube S2 are ideal I GBT, and diode D1 and diode D2 are ideal diode; Buffering reactor 3.2 is 3 milihenries; Phase reactor 3.3 is 15 milihenries, 0.6 ohm of phase reactor 3.3 resistance.The switching mode of submodule 3.1 adopts nearest level modulation method, and the selectivity switching is all pressed strategy, and the cross decoupling method is adopted in the control of modularization multi-level converter 3.
In conjunction with Fig. 3, V
C, I
CBe modularization multi-level converter 3 output voltages, current waveform,, have voltage waveform high level number, the little characteristics of current waveform distortion for only drawn for simplicity A phase voltage, current waveform; P
_ out, Q
_ outBe that converter is to actual meritorious, the idle waveform that injects of receiving-end system B, P
_ ref, Q
_ refBe that converter injects meritorious, idle set-point to receiving-end system B; V
DC1Be the direct voltage of diode rectifier 1 output, have tangible 12 pulse wave features; V
DC2It is the DC voltage waveform of modularization multi-level converter 3 inputs; I
DCBe the current waveform that flows through on the DC power transmission line 2, because rectifier is that diode is not controlled type, so this electric current perseverance is more than or equal to 0.
0～1.0 second Computer Simulation is verified meritorious, the idle independent regulation characteristic of the low cost DC transmission system that unidirectional power transmits.
In conjunction with Fig. 4, V
C, I
CBe modularization multi-level converter 3 output voltages, current waveform; I
LEGBe modularization multi-level converter 3 brachium pontis current waveforms, for A first brachium pontis current waveform mutually that only drawn for simplicity, owing to cushion the cushioning effect of reactor 3.2, under the maximum power output situation, the brachium pontis peak current is limited in the 1kA as can be seen; V
DC_A_1Be the voltage waveform that A goes up the dc capacitor C of first submodule 3.1 of brachium pontis mutually, under the maximum power output situation, average voltage is about 0.9kV, the positive and negative approximately 100V of fluctuation range.
Related all electronics of the present invention, all outsourcings of electric components.
In addition, number in the figure also has: V
C-A, V
C-B, V
C-CBe respectively A phase, B phase, the C voltage in mutually; I
C-A, I
C-B, I
C-CIt is respectively A phase, B phase, the C electric current in mutually; P-ref is converter injects a set point from active power to receiving-end system; P-out is the active power of converter to the actual injection of receiving-end system; Q-ref is converter injects a set point from reactive power to receiving-end system; Q-out is the reactive power of converter to the actual injection of receiving-end system.
Claims (3)
1. the low cost DC transmission system that transmits of a unidirectional power is characterized in that this system comprises: be connected in series diode rectifier (1) successively between sending (A) and receiving-end system (B), contain the DC power transmission line (2) and the modularization multi-level converter (3) of positive pole and two leads of negative pole;
Described diode rectifier comprises rectifier transformer (1.2) and diode rectifier bridge (1.1); The former limit of rectifier transformer links to each other with the sending of the three-phase alternating current that active power is provided, and secondary links to each other with the ac input end of diode rectifier bridge; The positive pole of diode rectifier bridge links to each other with the positive pole of DC power transmission line (2), and the negative pole of diode rectifier bridge links to each other with the negative pole of DC power transmission line (2);
Described modularization multi-level converter comprises a plurality of submodules (SM), and several cushion reactor (3.2), also has phase reactor (3.3) or converter transformer; A plurality of submodules are in series and form the three phase full bridge structure, and the positive pole of three phase full bridge structure links to each other with the positive pole of DC power transmission line, and the negative pole of three phase full bridge structure links to each other with the negative pole of DC power transmission line; Each half-bridge arm of three phase full bridge structure buffering reactor (3.2) of all connecting; One end of phase reactor (3.3) or converter transformer links to each other with the end that exchanges of three phase full bridge structure, and the other end links to each other with the three-phase alternating current receiving-end system of accepting active power.
2. the low cost DC transmission system that a kind of unidirectional power according to claim 1 transmits, it is characterized in that: described submodule (SM) is formed half H bridge circuit at first diode (D1) on first switching tube and position with second switching tube (S2) and second diode (D2) of inverse parallel on second switching tube of following brachium pontis by first switching tube (S1) and the inverse parallel of position and last brachium pontis, the positive pole of half H bridge circuit links to each other with the positive pole of dc capacitor (C), and negative pole links to each other with the negative pole end of dc capacitor.
3. the low cost DC transmission system that a kind of unidirectional power according to claim 1 and 2 transmits, it is characterized in that: described diode rectifier bridge (1.1) is three-phase 6 pulse wave rectifier bridges, or six phases, 12 pulse wave rectifier bridges.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010269822 CN101976956A (en) | 2010-08-26 | 2010-08-26 | Single-direction power-transmitted low-cost direct-current transmission system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010269822 CN101976956A (en) | 2010-08-26 | 2010-08-26 | Single-direction power-transmitted low-cost direct-current transmission system |
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| CN101976956A true CN101976956A (en) | 2011-02-16 |
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|---|---|---|---|
| CN 201010269822 Pending CN101976956A (en) | 2010-08-26 | 2010-08-26 | Single-direction power-transmitted low-cost direct-current transmission system |
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Cited By (14)
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| CN102222929A (en) * | 2011-06-24 | 2011-10-19 | 梁一桥 | DC (Direct Current) power transmission system with function of unidirectionally transmitting power |
| CN102231520A (en) * | 2011-06-20 | 2011-11-02 | 浙江大学 | Hybrid DC (direct current) electric power transmission system |
| CN102253247A (en) * | 2011-06-22 | 2011-11-23 | 中国电力科学研究院 | Flexibly-expanded general experiment platform for modular multi-level current converter |
| CN102890209A (en) * | 2012-09-25 | 2013-01-23 | 许继集团有限公司 | Continuous current operation testing device of multi-level converter half-bridge type sub-module |
| CN102944768A (en) * | 2012-09-25 | 2013-02-27 | 许继集团有限公司 | Continuous current running test method for half-bridge sub-modules of multilevel converter |
| CN103001241A (en) * | 2011-09-16 | 2013-03-27 | 温县供电有限责任公司 | Medium-and-close-range medium-and-low-voltage anti-theft consumption-reducing power transmission system |
| CN103018586A (en) * | 2012-11-20 | 2013-04-03 | 中国科学院电工研究所 | Test device and test method for modularized multi-level current transformer sub-module |
| CN103117666A (en) * | 2013-02-26 | 2013-05-22 | 南京南瑞继保电气有限公司 | Flexible direct current (DC) transmission bipolar topological structure based on modular multi-level converter |
| CN103368416A (en) * | 2013-07-31 | 2013-10-23 | 三峡大学 | Long-distance direct-current feed system of underwater vehicle |
| CN103597693A (en) * | 2011-06-10 | 2014-02-19 | Abb技术有限公司 | Methods for de-energizing a chain-link converter, controller, computer programs and computer program products |
| CN104067503A (en) * | 2011-11-30 | 2014-09-24 | 伯明翰大学 | Power converter |
| CN104685771A (en) * | 2012-11-29 | 2015-06-03 | 株式会社东芝 | Power conversion device |
| CN106953341A (en) * | 2017-04-13 | 2017-07-14 | 林浩博 | The assessment system that converting plant influences on generator shafting in the case of a kind of three-phase equilibrium |
| WO2021047058A1 (en) * | 2019-09-09 | 2021-03-18 | 广东安朴电力技术有限公司 | Remote power transmission converter station and power transmission system |
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| CN103597693A (en) * | 2011-06-10 | 2014-02-19 | Abb技术有限公司 | Methods for de-energizing a chain-link converter, controller, computer programs and computer program products |
| CN102231520A (en) * | 2011-06-20 | 2011-11-02 | 浙江大学 | Hybrid DC (direct current) electric power transmission system |
| CN102253247A (en) * | 2011-06-22 | 2011-11-23 | 中国电力科学研究院 | Flexibly-expanded general experiment platform for modular multi-level current converter |
| CN102253247B (en) * | 2011-06-22 | 2015-05-13 | 中国电力科学研究院 | Flexibly-expanded general experiment platform for modular multi-level current converter |
| CN102222929A (en) * | 2011-06-24 | 2011-10-19 | 梁一桥 | DC (Direct Current) power transmission system with function of unidirectionally transmitting power |
| CN102222929B (en) * | 2011-06-24 | 2014-04-30 | 梁一桥 | DC (Direct Current) power transmission system with function of unidirectionally transmitting power |
| CN103001241A (en) * | 2011-09-16 | 2013-03-27 | 温县供电有限责任公司 | Medium-and-close-range medium-and-low-voltage anti-theft consumption-reducing power transmission system |
| CN104067503A (en) * | 2011-11-30 | 2014-09-24 | 伯明翰大学 | Power converter |
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| CN104067503B (en) * | 2011-11-30 | 2017-04-12 | 伯明翰大学 | Power converter |
| CN102944768B (en) * | 2012-09-25 | 2015-03-04 | 许继电气股份有限公司 | Continuous current running test method for half-bridge sub-modules of multilevel converter |
| CN102890209B (en) * | 2012-09-25 | 2015-07-22 | 许继电气股份有限公司 | Continuous current operation testing device of multi-level converter half-bridge type sub-module |
| CN102890209A (en) * | 2012-09-25 | 2013-01-23 | 许继集团有限公司 | Continuous current operation testing device of multi-level converter half-bridge type sub-module |
| CN102944768A (en) * | 2012-09-25 | 2013-02-27 | 许继集团有限公司 | Continuous current running test method for half-bridge sub-modules of multilevel converter |
| CN103018586B (en) * | 2012-11-20 | 2015-04-22 | 中国科学院电工研究所 | Test device and test method for modularized multi-level current transformer sub-module |
| CN103018586A (en) * | 2012-11-20 | 2013-04-03 | 中国科学院电工研究所 | Test device and test method for modularized multi-level current transformer sub-module |
| CN104685771A (en) * | 2012-11-29 | 2015-06-03 | 株式会社东芝 | Power conversion device |
| CN104685771B (en) * | 2012-11-29 | 2017-07-18 | 株式会社东芝 | Power-converting device |
| US9722507B2 (en) | 2012-11-29 | 2017-08-01 | Kabushiki Kaisha Toshiba | Electric power conversion apparatus |
| CN103117666A (en) * | 2013-02-26 | 2013-05-22 | 南京南瑞继保电气有限公司 | Flexible direct current (DC) transmission bipolar topological structure based on modular multi-level converter |
| CN103368416B (en) * | 2013-07-31 | 2015-06-10 | 三峡大学 | Long-distance direct-current feed system of underwater vehicle |
| CN103368416A (en) * | 2013-07-31 | 2013-10-23 | 三峡大学 | Long-distance direct-current feed system of underwater vehicle |
| CN106953341A (en) * | 2017-04-13 | 2017-07-14 | 林浩博 | The assessment system that converting plant influences on generator shafting in the case of a kind of three-phase equilibrium |
| WO2021047058A1 (en) * | 2019-09-09 | 2021-03-18 | 广东安朴电力技术有限公司 | Remote power transmission converter station and power transmission system |
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Application publication date: 20110216 |