CN104038077A - Single-phase direct-hanging AC-DC-AC converting system based on MMC (Modular Multilevel Converter) - Google Patents
Single-phase direct-hanging AC-DC-AC converting system based on MMC (Modular Multilevel Converter) Download PDFInfo
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- CN104038077A CN104038077A CN201410181392.6A CN201410181392A CN104038077A CN 104038077 A CN104038077 A CN 104038077A CN 201410181392 A CN201410181392 A CN 201410181392A CN 104038077 A CN104038077 A CN 104038077A
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- China
- Prior art keywords
- mmc
- phase
- ports
- brachium pontis
- power
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
- H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
- H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
- H02M5/453—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal
- H02M5/458—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M5/4585—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only having a rectifier with controlled elements
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/483—Converters with outputs that each can have more than two voltages levels
- H02M7/4835—Converters with outputs that each can have more than two voltages levels comprising two or more cells, each including a switchable capacitor, the capacitors having a nominal charge voltage which corresponds to a given fraction of the input voltage, and the capacitors being selectively connected in series to determine the instantaneous output voltage
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Ac-Ac Conversion (AREA)
Abstract
The invention discloses a single-phase direct-hanging AC-DC-AC converting system based on a MMC (Modular Multilevel Converter), which is formed by six MMC bridge arms in connection. P power modules with the same structures and an MMC bridge arm inductor L are connected in series to form each MMC bridge arm; the power module has a single-phase half-bridge structure and is formed by an IGBT half bridge and a DC energy storage capacitor; the six MMC bridge arms are in a three-phase connection and form two single-phase AC ports; and the two single-phase AC ports share the two MMC bridge arms in the six MMC bridge arms. The voltage phase difference of the two single-phase AC ports is 90 DEG, and the capacity of each sharing MMC bridge arm is the square root of 2 times of the capacity of the remaining MMC bridge arms. According to the single-phase direct-hanging AC-DC-AC converting system based on a MMC (Modular Multilevel Converter), voltage conversion and active power transfer between the two single-phase AC ports can be realized, the two single-phase AC ports can compensate reactive power respectively, and the system can be applied to frequency conversion occasions; a traction and matched transformer can be omitted, the occupied area and the investment can be reduced, the loss is reduced, and the efficiency is improved; and the system of the invention is advanced in technology, reliable and easy in implementation.
Description
Technical field
The present invention relates to a kind of based on the single-phase direct screening friendship of MMC orthogonal converter system, particularly attached wires of AC electrified railway and electric and electronic technical field.
Background technology
Along with the fast development of technology, the technology that power electronic equipment is realized voltage transformation and power transmission earns widespread respect and applies, and has some clear superiorities compared with transformer: volume is little, occupation of land is few; Output voltage amplitude keeps constant (not with load variations), and can smooth adjustment; Electric current, voltage, power controllability are good; Power factor is adjustable; There is circuit breaker function, rapidly limit value and disengagement failure etc.Also has the performance that do not possess of transformer-can conversion frequency and phase place.
Power electronic technology realizes AC voltage conversion and power transmission is divided into friendship (AC-AC) conversion and hands over orthogonal (AC-DC-AC) conversion two classes.By contrast, hand over orthogonal conversion to have better controllability and flexibility, therefore, handing over orthogonal conversion is the Main Means of realizing AC voltage conversion and power transmission.
Hand over orthogonal conversion to realize High AC voltage conversion and power transmission, conventionally have two kinds of modes.The one, low-pressure side parallel connection, high-pressure side cascade (series connection).Now, low-pressure side voltage is subject to the limit value of power electronic device and is lower, in order to prevent circulation, often need to realize voltage matches and isolation by Industrial Frequency Transformer.The 2nd, adopt and hand over orthogonal conversion+medium/high frequency transformer+friendship orthogonal mapping mode, be called electric power electric transformer (PET, power electronic transformer) or solid-state transformer (SST, solid-state transformer), realize voltage matches and isolation by medium/high frequency transformer, its advantage is that input side and outlet side all can cascades and be suitable for high voltage, and medium/high frequency transformer volume dwindles greatly, but structure is obviously complicated, and investment strengthens.
In order to cancel power frequency or the medium/high frequency transformer in conversion process, the R.Marquardt of university of Munich, Germany Federal Defence Forces and A.Lesnicar have proposed modular multi-level converter (MMC, modular multilevel converter) technology in 2002.The advantages such as MMC has symmetrical configuration, the degree of modularity is high, interchangeability good, convenient realization connects back-to-back, combines flexibly, be easy to expansion, switching device loss is little, harmonic characterisitic is good, and get final product direct screening in high-pressure system without transformer, 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.Obviously, the optimum utilization of its capacity of competence exertion in the time that the voltage of MMC both sides is identical or approach.
The present invention proposes the transformerless single-phase direct screening transformation system based on MMC technology, realizes power transmission and reactive power compensation, is mainly used in the power supply such as the same-phase compensation device occasion of attached wires of AC electrified railway, also can be used for other frequency conversion occasion.
Summary of the invention
Object of the present invention is just to provide a kind of single-phase direct screening based on MMC and hands over orthogonal converter system, realize power transmission and reactive power compensation, be mainly used in the power supply such as the same-phase compensation device occasion of attached wires of AC electrified railway, also can be used for the present invention of frequency conversion occasion and solve its technical problem, the technical scheme adopting is: orthogonal converter system is handed in a kind of single-phase direct screening based on MMC, it is characterized in that, connect and form by six MMC brachium pontis BA; Each MMC brachium pontis is in series by p identical power model PM and the inductance L of structure; Power model is single-phase semi-bridge structure, is made up of an IGBT half-bridge and a DC energy storage electric capacity, and six MMC brachium pontis are three and are connected and form two single phase alternating current (A.C.) ports; Two single phase alternating current (A.C.) ports share two MMC brachium pontis in six MMC brachium pontis, and have a terminal.
90 ° each other, two single phase alternating current (A.C.) port voltage phase angles, therebetween when transmitting active power,
Operation principle of the present invention is: the single-phase direct screening based on MMC hands over orthogonal converter system to transmit active power between two single phase alternating current (A.C.) ports; Two single phase alternating current (A.C.) ports are symmetrical, and active power can two-way flow; Two single phase alternating current (A.C.) ports can be distinguished compensating power.
Compared with prior art, the invention has the beneficial effects as follows:
One, the present invention can realize transformerless power transmission and reactive power compensation under high pressure.
Two, two of the present invention exchange port and share two MMC brachium pontis in six MMC brachium pontis, have shared the brachium pontis of a phase in three-phase, and simple in structure, capacity utilance is high.
Three, the present invention, in realizing active power transmission and reactive power compensation, can realize frequency conversion, covert function.
Four, the present invention can save the transformer that matches and isolate, and takes up an area and investment thereby reduce, and reduces the wastage, and raises the efficiency, more energy-conserving and environment-protective.
Five, 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 MMC brachium pontis BA structural representation of the embodiment of the present invention.
Fig. 3 is the power model PM electrical block diagram of the embodiment of the present invention.
Embodiment
In this application, BA:bridge arm write a Chinese character in simplified form in English; PM:power module.
Embodiment
Fig. 1 illustrates, a kind of embodiment of the present invention is: by six MMC brachium pontis BA
a1, BA
a2, BA
1, BA
2, BA
b1, BA
b2be formed by connecting; Each MMC brachium pontis is in series by p identical power model PM and the inductance L of structure; Power model PM is single-phase semi-bridge structure, (contains T by an IGBT half-bridge
1, T
2) and a DC energy storage capacitor C
0form; MMC brachium pontis BA
a1with BA
a2, BA
1with BA
2, BA
b1with BA
b2an inner public public direct-current port after series connection, MMC brachium pontis BA
a1with BA
a2mid point is extracted terminal a, BA out
1with BA
2mid point is extracted terminal x, BA out
b1with BA
b2mid point is extracted terminal b out, and six MMC brachium pontis form three and are connected and form two single phase alternating current (A.C.) port ax and bx, have a terminal x; Two single phase alternating current (A.C.) ports share two MMC brachium pontis BA in six MMC brachium pontis
b1and BA
b2.
The voltage phase difference of two single phase alternating current (A.C.) ports is 90 °, in the time only transmitting active power,
Operation principle of the present invention is: between two single phase alternating current (A.C.) ports, transmit active power; Two single phase alternating current (A.C.) ports are symmetrical, reversible; Two single phase alternating current (A.C.) ports can be distinguished compensating power.
Fig. 2 is the MMC bridge arm structure schematic diagram of the embodiment of the present invention.Each MMC brachium pontis BA is in series by p identical power model PM and the inductance L of structure.
Fig. 3 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
1, T
2) and a DC energy storage capacitor C
0form; The direct voltage of the DC energy storage electric capacity of power model PM is U
c, single-phase MMC unit exchanges the voltage peak U of port
max=p × U
c.
Applicating example: the single-phase composite type cophase supply system of a Traction Substation of Electric Railway, single-phase main transformer and single-phase matching transformer are linked to be SCOTT wiring, former limit inlet wire specified (line) voltage (effective value) is 110kV, and the inferior limit rated voltage of single-phase main transformer and single-phase matching transformer is 27.5kV; Single-phase cophase supply device adopts the single-phase direct screening based on MMC to hand over orthogonal converter system: single phase alternating current (A.C.) port ax and single-phase main transformer time limit winding and load thereof are in parallel, the inferior limit winding parallel of single phase alternating current (A.C.) port bx and single-phase matching transformer, total terminal x ground connection, the voltage phase difference of single phase alternating current (A.C.) port ax and bx is 90 °
can realize single phase alternating current (A.C.) port bx to power transmission between single phase alternating current (A.C.) port ax; Single phase alternating current (A.C.) port ax and bx also can carry out respectively reactive power compensation.Compared with original cophase supply device, save and drawn with it matching transformer, reduce and taken up an area and investment.
Claims (2)
1. an orthogonal converter system is handed in the single-phase direct screening based on MMC, it is characterized in that, is connected and is formed by six MMC brachium pontis BA; Each MMC brachium pontis is in series by p identical power model PM and the inductance L of structure; Power model is single-phase semi-bridge structure, is made up of an IGBT half-bridge and a DC energy storage electric capacity, and six MMC brachium pontis are three and are connected and form two single phase alternating current (A.C.) ports; Two single phase alternating current (A.C.) ports share two MMC brachium pontis in six MMC brachium pontis, and have a terminal.
2. orthogonal converter system is handed in a kind of single-phase direct screening based on MMC according to claim 1, it is characterized in that: 90 ° each other, described two single phase alternating current (A.C.) port voltage phase angles, and therebetween when transmitting active power,
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410181392.6A CN104038077A (en) | 2014-04-29 | 2014-04-29 | Single-phase direct-hanging AC-DC-AC converting system based on MMC (Modular Multilevel Converter) |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410181392.6A CN104038077A (en) | 2014-04-29 | 2014-04-29 | Single-phase direct-hanging AC-DC-AC converting system based on MMC (Modular Multilevel Converter) |
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| Publication Number | Publication Date |
|---|---|
| CN104038077A true CN104038077A (en) | 2014-09-10 |
Family
ID=51468715
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410181392.6A Pending CN104038077A (en) | 2014-04-29 | 2014-04-29 | Single-phase direct-hanging AC-DC-AC converting system based on MMC (Modular Multilevel Converter) |
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| CN (1) | CN104038077A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106787811A (en) * | 2017-02-15 | 2017-05-31 | 中南大学 | A kind of single-phase electricity flow pattern AC/DC/AC converters and its modulator approach |
Citations (7)
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|---|---|---|---|---|
| CN1316821A (en) * | 2000-04-03 | 2001-10-10 | 三垦电气株式会社 | Power conversion device |
| CN1665116A (en) * | 2004-12-31 | 2005-09-07 | 中原工学院 | Biphase orthogonal vector control type magnetic stirrer inverter |
| CN102005938A (en) * | 2010-08-25 | 2011-04-06 | 力博特公司 | Control method of bridge arm in UPS (uninterruptible power supply) in case of zero-crossing operation |
| CN102624249A (en) * | 2012-04-23 | 2012-08-01 | 湖南大学 | Compound control method of three-phase to two-phase orthogonal inverter power supply with reactive compensation function |
| CN103199682A (en) * | 2013-03-01 | 2013-07-10 | 南方电网科学研究院有限责任公司 | Flexible direct-current transmission converter harmonic wave and loss calculation method based on MMC |
| CN203278743U (en) * | 2013-01-17 | 2013-11-06 | 福建睿能电子有限公司 | Motor frequency conversion controller |
| CN203933412U (en) * | 2014-04-29 | 2014-11-05 | 西南交通大学 | Orthogonal converter system is handed in a kind of single-phase direct screening based on MMC |
-
2014
- 2014-04-29 CN CN201410181392.6A patent/CN104038077A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1316821A (en) * | 2000-04-03 | 2001-10-10 | 三垦电气株式会社 | Power conversion device |
| CN1665116A (en) * | 2004-12-31 | 2005-09-07 | 中原工学院 | Biphase orthogonal vector control type magnetic stirrer inverter |
| CN102005938A (en) * | 2010-08-25 | 2011-04-06 | 力博特公司 | Control method of bridge arm in UPS (uninterruptible power supply) in case of zero-crossing operation |
| CN102624249A (en) * | 2012-04-23 | 2012-08-01 | 湖南大学 | Compound control method of three-phase to two-phase orthogonal inverter power supply with reactive compensation function |
| CN203278743U (en) * | 2013-01-17 | 2013-11-06 | 福建睿能电子有限公司 | Motor frequency conversion controller |
| CN103199682A (en) * | 2013-03-01 | 2013-07-10 | 南方电网科学研究院有限责任公司 | Flexible direct-current transmission converter harmonic wave and loss calculation method based on MMC |
| CN203933412U (en) * | 2014-04-29 | 2014-11-05 | 西南交通大学 | Orthogonal converter system is handed in a kind of single-phase direct screening based on MMC |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106787811A (en) * | 2017-02-15 | 2017-05-31 | 中南大学 | A kind of single-phase electricity flow pattern AC/DC/AC converters and its modulator approach |
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Application publication date: 20140910 |