CN103997232A - Single-phase and three-phase conversion system based on MMC units - Google Patents
Single-phase and three-phase conversion system based on MMC units Download PDFInfo
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- CN103997232A CN103997232A CN201410176985.3A CN201410176985A CN103997232A CN 103997232 A CN103997232 A CN 103997232A CN 201410176985 A CN201410176985 A CN 201410176985A CN 103997232 A CN103997232 A CN 103997232A
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Abstract
Disclosed is a single-phase and three-phase conversion system based on MMC units. Each MMC unit is formed by connecting 10 bridge arms, wherein four bridge arms constitute a single-phase inverter and form a single-phase alternating-current port, and the other six bridge arms constitute a three-phase inverter and form a three-phase alternating-current port. Each MMC bridge arm is formed by connecting p structurally-identical power modules and an MMC bridge arm inductor L in series. The power modules are of a single-phase half bridge structure and are respectively composed of an IGBT half bridge and a direct-current energy storage capacitor. The single-phase alternating-current ports of n MMC units are connected in series with a high-voltage system. The three-phase alternating-current ports of the MMC units are insulated from each other and are independently connected with a low-voltage system. Two-way active power flow between the single-phase high-voltage system and the three-phase low-voltage system is realized. A matching transformer is omitted, which enables the system to have the advantages of small size, light weight, high efficiency, and less investment. The single-phase and three-phase conversion system based on MMC units is advanced and reliable in technology, and is easy to implement.
Description
Technical field
The present invention relates to a kind of single-phase three-phase converter system based on modular multi-level converter (abbreviation MMC, modular multilevel converter), specially refer to electric railway train traction drive system, also can be used for frequency conversion occasion.
Background technology
Compared with DC traction motor, the advantage such as AC traction electric motor has that power density is high, low price, simple and reliable and slide system performance are good, therefore replacing direct current machine becomes the main power source of electric railway and track traffic traction.Electric railway adopts single phase power supply, and AC traction electric motor needs three-phase inverter to drive.In order to realize this translation function, in electric locomotive or motor train unit, be furnished with the orthogonal of friendship traction convertor, first single phase alternating current (A.C.) is transformed to direct current, then is transformed to three-phase alternating current by inverter.Electrified railway traction networks rated voltage is 27.5kV, ceiling voltage reaches 31kV, and the device for power switching highest voltage level of traction convertor is 6.5kV at present, just because of the restriction that is subject to power electronic device electric pressure, electric locomotive and motor train unit are furnished with traction transformer and first will after traction net voltage step-down, resupply traction convertor.Traction transformer volume is large, and weight is large, increases loss simultaneously, affects trailer system efficiency.
German scholar R.Marquardt and A.Lesnicar have proposed MMC technology in 2002.The advantages such as MMC has symmetrical configuration, the degree of modularity is high, and interchangeability is good, and-convenient realization back-to-back connects, and combination flexibly, is easy to expansion, and switching device loss is little, and harmonic characterisitic is good, can direct screening realize power transmission in high-pressure system.This feature of MMC makes it be particularly suitable for the meritorious and idle control of high voltage, high-power converter.MMC technology is more and more extensive in the application in the fields such as high voltage direct current transmission, static synchroballistic (STATCOM), THE UPFC (UPQC) in recent years.
The present invention proposes to intersect orthogonal converter system based on transformerless single-phase three of MMC technology, realize the single-phase bi-directional to three-phase energy, be mainly used in attached wires of AC electrified railway train traction system, can reduce the volume and weight of trailer system, improve trailer system efficiency.
Summary of the invention
The object of this invention is to provide a kind of single-phase three crossing orthogonal converter systems based on MMC unit, in electric locomotive and motor train unit, realize the traction convertor without traction transformer, reduce the volume and weight of trailer system, improve trailer system efficiency.The present invention mainly uses electric railway traction drive, realizes the conversion of single-phase traction net to three phase electric machine driving power, also can be used for frequency conversion occasion.
The present invention solves its technical problem, and the technical scheme adopting is: a kind of single-phase three-phase converter system based on MMC unit, by n MMC cell formation; Each MMC unit is made up of ten brachium pontis, and wherein four brachium pontis form a single-phase inverter, and all the other six brachium pontis form a three-phase inverter; The DC link parallel connection of two inverters; Outside forms respectively a single phase alternating current (A.C.) port and a three-phase alternating current port; Each brachium pontis is in series by p identical power model PM and the brachium pontis inductance L of structure; Power model PM is single-phase semi-bridge structure, is made up of an IGBT half-bridge and a DC energy storage electric capacity; Exchange the alternating voltage maximum U of port
maxthe direct voltage U of=public direct-current port
dc, the single phase alternating current (A.C.) port of n MMC unit is connected in series high-pressure system, between the three-phase alternating current port of each MMC unit, insulate, and separate connection low-pressure system.
Like this, each MMC unit one side is single-phase inverter, forms a single phase alternating current (A.C.) port, opposite side is three-phase inverter, form a three-phase alternating current port, the DC link parallel connection of two inverters, can realize the two-way flow of active power between single phase alternating current (A.C.) port and three-phase alternating current port; Each MMC unit exchanges the alternating voltage maximum U of port
maxthe direct voltage U of=public direct-current port
dc; The single-phase side series connection of n MMC unit, and implement Pressure and Control, three-phase side is independent, and electric insulation each other prevents that circulation from occurring; Each MMC unit is made up of 10 identical brachium pontis Ap, An, Bp, Bn, Cp, Cn, Dp, Dn, Ep and En of structure, wherein four brachium pontis Dp, Dn, Ep and En form a single-phase inverter, and six brachium pontis Ap, An, Bp, Bn, Cp and Cn form a three-phase inverter.Each brachium pontis is in series by p identical power model PM and the brachium pontis inductance L of structure; Power model PM is single-phase semi-bridge structure, is made up of an IGBT half-bridge and a DC energy storage electric capacity.The single-phase side series connection of n MMC unit, therefore, single-phase side can be directly into the very high electric power system of electric pressure, realize high-voltage one-phase side power and the low voltage three-phase side power that is isolated from each other between two-way flow.
Adopt structure of the present invention, utilize MMC technology to form single-phase three phase units, between single phase alternating current (A.C.) port and three-phase alternating current port, realize the two-way flow of active power by DC link; Utilize the single-phase inverter series connection based on MMC, make single-phase side can directly access high-pressure system, realize the two-way flow of single-phase side high-pressure system and three-phase side low-pressure system active power; Single-phase side also can provide reactive power and harmonic current to single-phase electrical network simultaneously, realizes active reactive power compensation and harmonic filtration; As required, three-phase side also can provide reactive power and harmonic current simultaneously.
Compared with prior art, the invention has the beneficial effects as follows:
One, the present invention can save transformer, realizes the bidirectional power transmission of high-voltage one-phase to low voltage three-phase, makes system bulk little, and lightweight, efficiency is high.
Two, the present invention, because adopted many level structure, can obtain good voltage and current waveform in single-phase side and three-phase side in the time that switching frequency is very low.
Three, the present invention adopts MMC structure, by Redundancy Design, can improve the reliabilty and availability of system.
Four, the technology of the present invention advanced person, reliable, easy to implement.
Below in conjunction with the drawings and specific embodiments, the invention will be further described.
Brief description of the drawings
Fig. 1 is the structural representation of the embodiment of the present invention.
Fig. 2 is the structural representation of the MMC unit of the embodiment of the present invention.
Fig. 3 is the MMC bridge arm structure BM schematic diagram of the embodiment of the present invention.
Fig. 4 is the power model PM electrical block diagram of the embodiment of the present invention.
Embodiment
Embodiment
Fig. 1 illustrates, a kind of embodiment of the present invention is: system is by n MMC cell formation.Each MMC unit one side is single-phase inverter, and opposite side is three-phase inverter, the DC link parallel connection of two inverters.Between n MMC unit, single-phase side series connection, implements all to press observing and controlling, and three-phase side is independent, electric insulation each other.Each unit is made up of ten identical brachium pontis Ap, An, Bp, Bn, Cp, Cn, Dp, Dn, Ep and En of structure, wherein four brachium pontis Dp, Dn, Ep and En form a single-phase inverter, and 6 brachium pontis Ap, An, Bp, Bn, Cp and Cn form a three-phase inverter; Each brachium pontis is in series by p identical power model PM and the brachium pontis inductance L of structure; Power model PM is single-phase semi-bridge structure, is made up of an IGBT half-bridge and a DC energy storage electric capacity.The single-phase side series connection of n MMC unit, carries out Pressure and Control between unit, ensure the direct voltage equilibrium of each unit; The series connection of single-phase side can be directly into the very high electric power system of electric pressure, realize single-phase side high-pressure system and the three-phase side low-pressure system that is isolated from each other between the two-way flow of power.
Operation principle of the present invention is: utilize MMC technology to form single-phase three phase units, realize the two-way flow of active power between single phase alternating current (A.C.) port and three-phase alternating current port by DC link; Utilize the single-phase inverter series connection based on MMC, make single-phase side can directly access high-pressure system, realize the two-way flow of single-phase side high-pressure system and three-phase side low-pressure system active power; Single-phase side also can provide reactive power and harmonic current to single-phase electrical network simultaneously, realizes active reactive power compensation and harmonic filtration; As required, three-phase side also can provide reactive power and harmonic current simultaneously.
Fig. 2 is the structure chart of the MMC unit of the embodiment of the present invention.Each MMC unit is made up of 10 identical brachium pontis Ap, An, Bp, Bn, Cp, Cn, Dp, Dn, Ep and En of structure; Brachium pontis Dp, Dn, Ep and En form single-phase inverter, and brachium pontis Ap, An, Bp, Bn, Cp and Cn form three-phase inverter.The DC side parallel of two inverters.
Fig. 3 is the MMC unit bridges arm configuration schematic diagram of the embodiment of the present invention.Each brachium pontis is in series by p identical power model PM and the brachium pontis inductance L of structure.
Fig. 4 is the power module circuit schematic diagram of the embodiment of the present invention.Power model PM is single-phase semi-bridge structure, (contains T by an IGBT half-bridge
1and T
2two switches) and a DC energy storage capacitor C
0form.
Application example: without the motor train unit alternating current traction system of traction transformer.Single-phase side a
1b
ndirectly by pantograph access traction net, n three-phase side A
1b
1c
1, A
2b
2c
2... .A
nb
nc
ngive respectively the power supply of n platform traction electric machine, drive train operation.When traction, power is supplied with traction electric machine by single-phase effluent to three-phase side, and now traction electric machine is motor, by electric energy conversion mechanical energy, produces tractive effort; When regenerative braking, power flows to single-phase side by three-phase side, and now motor is generator, and mechanical energy is converted into electric energy, produces braking force simultaneously.Known pantograph high-pressure system rated voltage (effective value) is 27.5kV, low-pressure system three-phase traction motor specified (line) voltage (effective value)=2.2kV, integer=12 of integer=(12.5) of the integer of required MMC unit number n=(high-pressure system rated voltage effective value ÷ low-pressure system rated voltage effective value)=(27.5/2.2), so, single phase alternating current (A.C.) port rated voltage (effective value)=three-phase alternating current port specified (line) voltage (the effective value)=27.5/12kV=2.29kV of each MMC unit, MMC unit exchanges the alternating voltage maximum (peak value) of port
so high-pressure system is together in series 12 MMC unit single phase alternating current (A.C.) ports, 12 groups of three-phase traction motors of low-pressure system electric insulation each other, independent operating.
Claims (2)
1. the single-phase three-phase converter system based on MMC unit, is characterized in that, by n MMC cell formation; Each MMC unit is made up of ten brachium pontis, and wherein four brachium pontis form a single-phase inverter, and all the other six brachium pontis form a three-phase inverter; The DC link parallel connection of two inverters; Outside forms respectively a single phase alternating current (A.C.) port and a three-phase alternating current port; Each brachium pontis is in series by p identical power model PM and the brachium pontis inductance L of structure; Power model PM is single-phase semi-bridge structure, is made up of an IGBT half-bridge and a DC energy storage electric capacity; Exchange the alternating voltage maximum U of port
maxthe direct voltage U of=public direct-current port
dc, the single phase alternating current (A.C.) port of n MMC unit is connected in series high-pressure system, between the three-phase alternating current port of each MMC unit, insulate, and separate connection low-pressure system.
2. a kind of single-phase three-phase converter system based on MMC unit according to claim 1, is characterized in that: the integer of MMC unit number n=(high-pressure system rated voltage effective value ÷ low-pressure system rated voltage effective value); Interchange port rated voltage effective value=high-pressure system rated voltage effective value/n of MMC unit.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410176985.3A CN103997232A (en) | 2014-04-29 | 2014-04-29 | Single-phase and three-phase conversion system based on MMC units |
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| CN201410176985.3A CN103997232A (en) | 2014-04-29 | 2014-04-29 | Single-phase and three-phase conversion system based on MMC units |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104570761A (en) * | 2014-11-21 | 2015-04-29 | 成都运达科技股份有限公司 | Visual simulation method for traction and braking of CRH train |
| CN104702124A (en) * | 2015-01-22 | 2015-06-10 | 西南交通大学 | MMC (Multi Media Card) based single-phase-three-phase conversion system containing capacitor bridge arm |
| CN105119511A (en) * | 2015-08-28 | 2015-12-02 | 江苏省电力公司扬州供电公司 | MMC sub module circuit with DC-side fault blocking ability |
| CN112886829A (en) * | 2021-01-21 | 2021-06-01 | 南方科技大学 | Traction drive system |
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| CN101572495A (en) * | 2009-03-10 | 2009-11-04 | 东南大学 | Multifunctional power electric transformer |
| CN102904271A (en) * | 2012-09-27 | 2013-01-30 | 株洲变流技术国家工程研究中心有限公司 | Traction contact system |
| CN103236710A (en) * | 2013-04-12 | 2013-08-07 | 国家电网公司 | Unified power flow controller in modular structure |
| CN203872062U (en) * | 2014-04-29 | 2014-10-08 | 西南交通大学 | MMC-unit single-phase/three-phase current changing system |
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Patent Citations (4)
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| CN101572495A (en) * | 2009-03-10 | 2009-11-04 | 东南大学 | Multifunctional power electric transformer |
| CN102904271A (en) * | 2012-09-27 | 2013-01-30 | 株洲变流技术国家工程研究中心有限公司 | Traction contact system |
| CN103236710A (en) * | 2013-04-12 | 2013-08-07 | 国家电网公司 | Unified power flow controller in modular structure |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104570761A (en) * | 2014-11-21 | 2015-04-29 | 成都运达科技股份有限公司 | Visual simulation method for traction and braking of CRH train |
| CN104570761B (en) * | 2014-11-21 | 2017-11-24 | 成都运达科技股份有限公司 | A kind of visual simulating method of EMUs traction braking |
| CN104702124A (en) * | 2015-01-22 | 2015-06-10 | 西南交通大学 | MMC (Multi Media Card) based single-phase-three-phase conversion system containing capacitor bridge arm |
| CN105119511A (en) * | 2015-08-28 | 2015-12-02 | 江苏省电力公司扬州供电公司 | MMC sub module circuit with DC-side fault blocking ability |
| CN105119511B (en) * | 2015-08-28 | 2018-01-09 | 国网江苏省电力公司扬州供电公司 | A kind of MMC submodular circuits with DC side failure blocking ability |
| CN112886829A (en) * | 2021-01-21 | 2021-06-01 | 南方科技大学 | Traction drive system |
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Application publication date: 20140820 |