CN203933412U - Orthogonal converter system is handed in a kind of single-phase direct screening based on MMC - Google Patents
Orthogonal converter system is handed in a kind of single-phase direct screening based on MMC Download PDFInfo
- Publication number
- CN203933412U CN203933412U CN201420214826.3U CN201420214826U CN203933412U CN 203933412 U CN203933412 U CN 203933412U CN 201420214826 U CN201420214826 U CN 201420214826U CN 203933412 U CN203933412 U CN 203933412U
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- CN
- China
- Prior art keywords
- mmc
- brachium pontis
- alternating current
- mmc brachium
- phase alternating
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- Expired - Lifetime
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- 238000012216 screening Methods 0.000 title claims abstract description 12
- 238000004146 energy storage Methods 0.000 claims abstract description 6
- 238000006243 chemical reaction Methods 0.000 abstract description 15
- 230000005540 biological transmission Effects 0.000 abstract description 11
- 238000005516 engineering process Methods 0.000 abstract description 8
- 230000009466 transformation Effects 0.000 abstract description 3
- 230000008878 coupling Effects 0.000 abstract 1
- 238000010168 coupling process Methods 0.000 abstract 1
- 238000005859 coupling reaction Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 3
- 239000003990 capacitor Substances 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 238000013507 mapping Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
Classifications
-
- 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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Abstract
An orthogonal converter system is handed in single-phase direct screening based on MMC, is connected and is formed by six MMC brachium pontis; Each MMC brachium pontis is in series by p identical power model and the MMC brachium pontis 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; 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.Two single phase alternating current (A.C.) port voltage phase differences are 90 °, and the capacity of each shared MMC brachium pontis is all the other each MMC brachium pontis capacity
doubly.The utility model can be realized voltage transformation and active power transmission between two single phase alternating current (A.C.) ports, and two single phase alternating current (A.C.) ports still can be distinguished compensating power, are also suitable for frequency conversion occasion; Can save the transformer of traction coupling, and then reduce occupation of land and investment, reduce the wastage, raise the efficiency.The utility model advanced technology, reliable, easy to implement.
Description
Technical field
The utility model 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.The performance one that also has transformer not possess 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 utility model proposes the transformerless single-phase direct screening transformation system based on MMC technology, 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 other frequency conversion occasion.
Utility model content
The purpose of this utility model 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 frequency conversion occasion the utility model 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, the capacity of each shared MMC brachium pontis=
the capacity of × each non-shared MMC brachium pontis.
Operation principle of the present utility model 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 beneficial effects of the utility model are:
One, the utility model can be realized transformerless power transmission and reactive power compensation under high pressure.
Two, two of the utility model 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 utility model, in realizing active power transmission and reactive power compensation, can be realized frequency conversion, covert function.
Four, the utility model 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 utility model advanced technology, reliable, easy to implement.
Below in conjunction with the drawings and specific embodiments, the utility model will be further described.
Brief description of the drawings
Fig. 1 is the structural representation of the utility model embodiment.
Fig. 2 is the MMC brachium pontis BA structural representation of the utility model embodiment.
Fig. 3 is the power model PM electrical block diagram of the utility model embodiment.
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 utility model 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
oform; 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, shares MMC brachium pontis BA
1(BA
2) capacity=
× non-shared MMC brachium pontis BA
a1(BAa
2, BA
b1, BA
b2) capacity.
Operation principle of the present utility model 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 utility model embodiment.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 utility model embodiment.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
oform; 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 °, MMC brachium pontis BA
1(BA
2) capacity=
× MMC brachium pontis BA
a1(BA
a2, BA
b1, BA
b2) capacity, 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, the capacity of each shared MMC brachium pontis=
the capacity of × each unshared MMC brachium pontis.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420214826.3U CN203933412U (en) | 2014-04-29 | 2014-04-29 | Orthogonal converter system is handed in a kind of single-phase direct screening based on MMC |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420214826.3U CN203933412U (en) | 2014-04-29 | 2014-04-29 | Orthogonal converter system is handed in a kind of single-phase direct screening based on MMC |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203933412U true CN203933412U (en) | 2014-11-05 |
Family
ID=51829164
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420214826.3U Expired - Lifetime CN203933412U (en) | 2014-04-29 | 2014-04-29 | Orthogonal converter system is handed in a kind of single-phase direct screening based on MMC |
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| Country | Link |
|---|---|
| CN (1) | CN203933412U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104038077A (en) * | 2014-04-29 | 2014-09-10 | 西南交通大学 | Single-phase direct-hanging AC-DC-AC converting system based on MMC (Modular Multilevel Converter) |
| CN106786724A (en) * | 2017-01-23 | 2017-05-31 | 浙江大学 | A kind of control strategy of many times MMC HVDC feed-ins pole light current net |
-
2014
- 2014-04-29 CN CN201420214826.3U patent/CN203933412U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104038077A (en) * | 2014-04-29 | 2014-09-10 | 西南交通大学 | Single-phase direct-hanging AC-DC-AC converting system based on MMC (Modular Multilevel Converter) |
| CN106786724A (en) * | 2017-01-23 | 2017-05-31 | 浙江大学 | A kind of control strategy of many times MMC HVDC feed-ins pole light current net |
| CN106786724B (en) * | 2017-01-23 | 2019-05-28 | 浙江大学 | A kind of control strategy of more times MMC-HVDC feed-ins pole weak grid |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |