CN101795080A - Three-phase power electronics transformer for power distribution - Google Patents
Three-phase power electronics transformer for power distribution Download PDFInfo
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- CN101795080A CN101795080A CN 201010117552 CN201010117552A CN101795080A CN 101795080 A CN101795080 A CN 101795080A CN 201010117552 CN201010117552 CN 201010117552 CN 201010117552 A CN201010117552 A CN 201010117552A CN 101795080 A CN101795080 A CN 101795080A
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Abstract
The invention discloses a three-phase power electronics transformer for power distribution, which is composed of an input stage, an isolation stage and an output stage, wherein the input stage is a cascading modularized current transformer (1), the isolation stage is composed of a duplex-winding high or medium frequency transformer (2) and an all-control H bridge (3) which are connected with each other, and the output stage is composed of one or a plurality of single-phase or three-phase inverters (4) connected to a public DC bus. The invention can reduce the volume and the weight of the transformer; besides that the transformer can realize the functions of transformation, isolation, energy transfer and the like of the traditional distribution transformer, the transformer can provide reactive compensation for a power grid, ensures constant secondary output voltage, isolates the faults of high-pressure side power grid and low-pressure side user, has the capability of continuously regulating and comprehensively controlling voltage and current, can realize the uninterrupted power supply for the user side when being mutually connected with new energy generating equipment, and realizes the interaction with other equipment of the power grid.
Description
Technical field
The present invention relates to a kind of three-phase power electronic transformer.
Background technology
Traditional power transformer is the basic composition equipment of electric power system, and its outstanding advantage is that manufacture craft is simple, reliability is high, cheap.But traditional power transformer only can be realized single electric pressure conversion, the isolation transmission of electric energy.In addition, because the non-linear of ferromagnetic element caused the distortion of line voltage and electric current to produce harmonic pollution, and it is constant to keep secondary voltage, do not possess continuous adjusting and Comprehensive Control ability to voltage, electric current, can not realize and the interaction of other equipment of electrical network, can not satisfy the requirement of following intelligent grid.Electric power electric transformer is the power equipment that can be used for electric power system transformation of electrical energy and transmission of a kind of novel intelligentization of occurring along with the technological progress of power electronics.
1970, U.S. GE company at first proposed a kind of AC/AC translation circuit with high frequency link.1996, people such as the Koosuke Harada of EMUs for Kyushu of Japan Utilities Electric Co. developed the model machine of a single-phase 3kVA on its basis, and with its called after intelligent transformer (Intelligent Transformer).In same year, the people such as A.C.Rufer of Lausanne, SUI Polytechnics proposed to adopt single-phase many level of four-quadrant Locomotive Converter of intermediate frequency transformer.Calendar year 2001, the Philip C. of ABB AB
Proposed a kind of single-phase AC/AC current transformer Deng the people, be used for Locomotive Converter based on the three-phase intermediate frequency transformer.Same year, the C.Chabert of French Institut de Recherche De L ' Ecole Navale proposed a kind of two-layer configuration current transformer that adopts single-phase intermediate frequency transformer to isolate.2002, be subjected to the support of ABB AB, the Edward R.Ronan of Missouri, USA university etc. has proposed a kind of power electronics distribution transformer of tertiary structure.After American Electric Power research institute proposed the notion of intelligent grid (Intelligrid) in calendar year 2001, intelligent grid required intelligent power distribution equipment and technology had just begun one's study.Through making thorough investigation and study, will be based on intelligent universal transformer (the Intelligent Universal Transformer of modern power electronics technology, IUT) as one of important R﹠D work in its intelligent power distribution net, a kind of IUT topology based on the many level current transformers of diode clamp formula was proposed in 2005, and developed input voltage 2.4kV in 2006, capacity is the single-phase experimental prototype of 20kVA.2007, ABB AB successfully developed an input voltage 15kV based on the two-layer configuration of C.Chabert, and capacity is the locomotive traction of a 1.2MVA Monophase electric power electronic transformer.Be 2007 equally, Bombardier Transportation company has successfully developed a locomotive traction Monophase electric power electronic transformer based on tertiary structure.Since 2008, American Electric Power research institute began to develop the single-phase IUT that is made of SGTO based on tertiary structure, and input voltage is 15kV, and capacity is 100kVA.Estimated for the end of the year 2009 and will carry out scene operation test.The intelligent universal transformer is developed and promoted the use of to its target exactly, replaces to be extensive use of traditional distribution transformer at present, makes its key equipment that becomes following intelligent grid and part.Above-mentioned various topological structures about electric power electric transformer have all only been developed single-phase model machine, and the three-phase power electronic transformer that power distribution network is used does not still have the topology of practical application.
U.S. Pat 2006/0221653 A1 and US 7050311 B2 have adopted three level structures of diode clamp formula at the high pressure outlet side, and this structure has limited its application at system for distribution network of power especially high voltage distribution network greatly.U.S. Pat 2006/0028848 A1 has then adopted winding Industrial Frequency Transformer more than three in the high-pressure side, increased the volume and weight of electric power electric transformer greatly.And U.S. Pat 005943229A, European patent EP 0989016 A2, Chinese patent 200910025824.3,200910184407.3,02139030.4, utility model patent ZL02290343.7 have all adopted a plurality of intermediate frequencies or high frequency transformer.
Summary of the invention:
The objective of the invention is to overcome the shortcoming of existing distribution, reduce the volume and weight of device, improve energy conversion efficiency with electric power electric transformer.The present invention not only can realize outside the functions such as the transformation, isolation, energy delivery of traditional distribution transformer, can also provide reactive power compensation for electrical network as required, the assurance secondary output voltage is constant, cut off high-pressure side electrical network and low-pressure side user fault, possess continuous adjusting and Comprehensive Control ability to electric current and voltage, when with the generation of electricity by new energy apparatus interconnection, can realize the user side uninterrupted power supply, realize plurality of advantages such as interaction with other equipment of electrical network.
Three-phase power electronics transformer for power distribution of the present invention is made up of input stage, isolation level and three parts of output stage.Input stage is a three-phase three-wire system, and main circuit is a tandem type modularization current transformer; Its input directly links to each other with the three-phase alternating current electrical network, realizes the AC-DC conversion; The output of tandem type modularization current transformer is connected with the double winding intermediate frequency of isolation level or the former limit of high frequency transformer.The double winding intermediate frequency of isolation level or the secondary of high frequency transformer link to each other with full-control type H bridge, realize the DC-DC conversion.Output stage is the inverter of the common DC bus of one or more single-phase or three-phases, realizes the DC-AC conversion.
Described three-phase power electronics transformer for power distribution is characterized in that the tandem type modularization current transformer of described input stage is made of five identical brachium pontis, and the upper end of five brachium pontis is connected a bit, and the lower end of five brachium pontis also is connected a bit.Wherein the mid point of three brachium pontis links to each other with three phase network, and the mid point of two other brachium pontis links to each other respectively with the double winding intermediate frequency of isolation level or two lead-in wires on the former limit of high frequency transformer.Each brachium pontis is formed by the power conversion module cascade of low pressure, need not to utilize the step-down of conventional electric power transformer can directly insert high voltage distribution network.The submodule of tandem type modularization current transformer is made of a full-control type brachium pontis and electric capacity parallel connection; The full-control type brachium pontis is made of two all-controlling power electronics device series connection.
Described three-phase power electronics transformer for power distribution is characterized in that described isolation level is directly linked to each other with full-control type H bridge by double winding intermediate frequency or high frequency transformer to constitute.Owing to adopted the full-control type device, described three-phase power electronic transformer can be realized the two-way flow of energy.Another structure of isolation level is to seal in resonant capacitance between double winding intermediate frequency or high frequency transformer and full-control type H bridge, and formation can realize the isolation level of series resonance.With respect to the isolation level of no series resonance, can realize the zero current resonant type soft-switch of intermediate frequency or the former secondary circuit of high frequency transformer after the employing series resonance, can reduce the loss of device greatly, improve operational efficiency.
Described three-phase power electronics transformer for power distribution is characterized in that described output stage is made of the inverter of the common DC bus of one or more single-phase or three-phases.Output stage can be exported the alternating voltage with the AC-input voltage same frequency of input stage, also can export the alternating voltage with input stage AC-input voltage different frequency and multiple frequency.In addition, when the primary side electrical network took place that outage takes place for barrier or maintenance of equipment etc. for some reason, output stage also can realize user's uninterrupted power supply at the direct voltage that dc bus inserts new forms of energy and provides by inverter.
Three-phase power electronics transformer for power distribution of the present invention has following characteristics:
1. can realize transformation, isolation, energy delivery or the like the basic function of conventional electric power distribution transformer;
2. input stage adopts tandem type modularization current transformer, as long as the enough modules of cascade can be born very high voltage.Simultaneously, only need a double winding intermediate frequency or high frequency transformer when the present invention is used for three-phase system, can reduce the volume and weight of transformer with respect to existing topology greatly.
3. when constituting the three-phase power electronic transformer by existing Monophase electric power electronic transformer, generally need other additional passive filter to eliminate the voltage fluctuation of line voltage two frequencys multiplication in the middle of the practical application on the AC-DC module dc bus of every phase input stage.And the present invention is owing to directly link to each other with three phase network, and the instantaneous active power of three-phase system is a constant basis, and there is not fluctuation in DC bus-bar voltage, does not therefore just need passive filter yet.This has also further reduced the volume and weight of system.
4. the present invention's isolation with electric power system that can realize loading can improve the quality of power supply and the reliability of operation of electric power system as required for grid side provides reactive power compensation or active power filtering function.
5. the present invention can regulate the supply power voltage of output stage automatically, guarantees that the user side supply power voltage does not change with load variations.When power supply grid breaks down or during maintenance of equipment, dc bus of the present invention can be connected with generating equipment such as new forms of energy, guarantees the uninterrupted power supply of user side, can greatly improve the stability and the reliability of user and power consumption equipment.
6. the present invention can realize the on-line monitoring of running status very easily, with the mutual communication of other power consumption equipment and coordinate control, for the construction of digitlization power station and intelligent grid provides more flexibilities with improving.
Description of drawings
Fig. 1 is three-phase power electronics transformer for power distribution overall structure figure of the present invention;
Fig. 2 is the physical circuit topology of single submodule Sub in the three-phase power electronics transformer for power distribution input stage tandem type modularization current transformer of the present invention;
Fig. 3 is a kind of concrete topology of typical case's application of three-phase power electronics transformer for power distribution output stage of the present invention, i.e. three-phase four-leg inverter;
Among the figure: 1 formula modularization current transformer, 2 double winding intermediate frequency or high frequency transformers, 3 full-control type H bridges, the inverter of 4 one or more single-phase or three-phase common DC buses, the submodule Sub of 5 tandem type modularization current transformers 1,6 resonant capacitances.
Embodiment
Further specify the present invention below in conjunction with the drawings and specific embodiments.
The present invention is made up of input stage, isolation level and three parts of output stage.Input stage is a three-phase three-wire system, and main circuit is a tandem type modularization current transformer 1; Its input directly links to each other with the three-phase alternating current electrical network, realizes the AC-DC conversion; The output of tandem type modularization current transformer 1 is connected with the former limit of the double winding intermediate frequency of isolation level or high frequency transformer 2.The double winding intermediate frequency of isolation level or high frequency transformer 2 link to each other with full-control type H bridge 3, realize the DC-DC conversion.Output stage is the inverter of the common DC bus of one or more single-phase or three-phases, realizes the DC-AC conversion.
As shown in Figure 1, input stage tandem type modularization current transformer 1 is made of identical five brachium pontis, and the upper end of five brachium pontis is connected same point P, and the lower end of five brachium pontis is connected same point N.The mid point a of three brachium pontis wherein, b, c links to each other with three phase network, the mid point r of two other brachium pontis
1, r
2Link to each other with isolation level.Described five brachium pontis are according to a, b, c, r
1, r
2Five mid points are divided into first brachium pontis and second brachium pontis respectively, and two half-bridges are made of the identical submodule Sub of quantity up and down.Submodule Sub has a brachium pontis and 1 parallel connection of first capacitor C.As shown in Figure 2, the brachium pontis of submodule Sub is by the 11 switch T
11, twelvemo closes T
12, the 11 diode D
11With the 12 D
12Form, wherein, the 11 switch T
11With the 11 diode D
11Inverse parallel, twelvemo is closed T
12With the 12 diode D
12Inverse parallel, the 11 switch T
11Close T with twelvemo
12Series connection, the 11 switch T
11Lower end and twelvemo close T
12The common tie point in upper end be designated as b
1, the 11 switch T
11The upper end and first capacitor C
1Positive pole link to each other, twelvemo is closed T
12The lower end and first capacitor C
1Negative pole link to each other first capacitor C
1Negative pole be designated as b
2, b
1And b
2Lead-out wire for submodule Sub.First brachium pontis of five brachium pontis and second brachium pontis constitute by submodule Sub cascade, that is: the lead-out wire b of a last submodule Sub
2B with next submodule Sub
1Link to each other.
The mid point r of two brachium pontis in the input stage tandem type modularization current transformer 1
1And r
2Link to each other with two lead-in wires on double winding intermediate frequency or high frequency transformer 2 former limits respectively.The mid point h of two lead-in wires of double winding intermediate frequency or high frequency transformer 2 secondary and two brachium pontis of full-control type H bridge 3
1And h
2Link to each other respectively.
Full-control type H bridge is by the first switch T
1, second switch T
2, the 3rd switch T
3, the 4th switch T
4, the first diode D
1, the second diode D
2, the 3rd diode D
3, the 4th diode D
4, and second capacitor C
2Constitute.Wherein, the first switch T
1With the first diode D
1Inverse parallel, second switch T
2With the second diode D
2Inverse parallel, the 3rd switch T
3With the 3rd diode D
3Inverse parallel, the 4th switch T
4With the 4th diode D
4Inverse parallel, the first switch T
1With second switch T
2Series connection constitutes first brachium pontis, the 3rd switch T
3With the 4th switch T
4Series connection constitutes second brachium pontis; The first switch T
1Lower end and second switch T
2The common tie point in upper end be designated as h
1, the 3rd switch T
3Lower end and the 4th switch T
4The common tie point in upper end be designated as h
2, the first switch T
1With the 3rd switch T
3The upper end and second capacitor C
2Positive pole link to each other second switch T
2With the 4th switch T
4The lower end and second capacitor C
2Negative pole link to each other.Second capacitor C
2Positive pole and negative pole provide direct voltage as the positive pole of direct current output and negative pole for the inverter 2 of the common DC bus of the one or more single-phase or three-phase of output stage.
Described switch is full-control type power electronic switching devices such as IGBT, IGCT, GTO.
On off state by power electronic device in control double winding intermediate frequency or high frequency transformer 2 former limits and the secondary circuit, make the former secondary of intermediate frequency or high frequency transformer all produce the same frequency square-wave voltage of several kHz, can realize the direct current energy conversion of different electric pressures to tens kHz.Output stage is an alternating voltage with inverter 4 inversions by the common DC bus of one or more single-phase or three-phases of the direct voltage of full-control type type H bridge 3 output.When inverter was exported lower voltage if desired, the intermediate frequency of isolation level or high frequency transformer were step-down transformer, and the direct voltage of isolation level output is also lower, and output stage can be selected common low pressure inverter, three-phase four-leg inverter for example shown in Figure 3 for use.Inverter output and the input voltage ad eundem of input stage even more during high voltage if desired, the intermediate frequency of isolation level or high frequency transformer are equipressure or step-up transformer, this moment, the direct voltage of isolation level output was very high, output stage can select for use the submodule Sub cascade identical with input stage to constitute the inverter brachium pontis, to bear high voltage.
Below for a specific embodiment of three-phase power electronics transformer for power distribution of the present invention:
Application example: 200kVA, the 10kV/380V step-down transformer
8 Sub submodules of each cascade of the arm of half-bridge up and down of five each brachium pontis of brachium pontis of input stage, the concrete topology choosing of submodule Sub is controlled the IGBT that device is selected 3300V/200A for use, switching frequency 2kHz as shown in Figure 2 entirely.The intermediate frequency transformer no-load voltage ratio is elected 700: 15000 as, rated capacity 200kVA, rated frequency 2kHz.The H bridge of isolation level is selected the IGBT of 1200V/600A for use, switching frequency 2kHz, and promptly the former secondary of intermediate frequency transformer is the square-wave voltage of 2kHz.Output stage adopts three-phase four-leg inverter shown in Figure 3, and switching device is selected the IGBT of 1200V/600A for use, switching frequency 5kHz.
Claims (6)
1. three-phase power electronics transformer for power distribution is characterized in that: described three-phase power electronic transformer is made up of input stage, isolation level and three parts of output stage; Input stage is a tandem type modularization current transformer (1), and the input of tandem type modularization current transformer (1) directly links to each other with the three-phase alternating current electrical network, and the output of tandem type modularization current transformer (1) is connected with the double winding intermediate frequency of isolation level or the former limit of high frequency transformer (2); The secondary of the double winding intermediate frequency of isolation level or high frequency transformer (2) links to each other with full-control type H bridge (3); Output stage is one or more single-phase or three-phase inverter (4) of common DC bus.
2. three-phase power electronics transformer for power distribution as claimed in claim 1, the tandem type modularization current transformer (1) that it is characterized in that described input stage is made of five identical brachium pontis, the upper end of five brachium pontis is connected a bit, and the lower end of five brachium pontis is connected a bit; Wherein the mid point of three brachium pontis links to each other with three phase network, and the mid point of two other brachium pontis links to each other respectively with the double winding intermediate frequency of isolation level or two lead-in wires on the former limit of high frequency transformer; Each brachium pontis is formed by submodule Sub cascade, and submodule Sub is by a full-control type brachium pontis and first electric capacity (C1) formation in parallel; The full-control type brachium pontis of described submodule Sub is made of two switch series connection.
3. three-phase power electronics transformer for power distribution as claimed in claim 2 is characterized in that in the described full-control type brachium pontis the 11 switch (T
11) and the 11 diode (D
11) inverse parallel, twelvemo is closed (T
12) and the 12 diode (D
12) inverse parallel, the 11 switch (T
11) and twelvemo pass (T
12) series connection, the 11 switch (T
11) lower end and twelvemo close (T
12) the common tie point in upper end be designated as b
1, the 11 switch (T
11) the upper end and the first electric capacity (C
1) positive pole link to each other, twelvemo is closed (T
12) the lower end and the first electric capacity (C
1) negative pole link to each other.
4. three-phase power electronics transformer for power distribution as claimed in claim 1 is characterized in that described isolation level is by double winding intermediate frequency or high frequency transformer (2) secondary and full-control type H bridge (3) formation that directly links to each other; Perhaps between double winding intermediate frequency or high frequency transformer (2) and full-control type H bridge (3), seal in resonant capacitance (6), constitute the isolation level of realizing series resonance by transformer leakage inductance and resonant capacitance (6).
5. three-phase power electronics transformer for power distribution as claimed in claim 1 is characterized in that in the described full-control type H bridge the first switch (T
1) and the first diode (D
1) inverse parallel, second switch (T
2) and the second diode (D
2) inverse parallel, the 3rd switch (T
3) and the 3rd diode (D
3) inverse parallel, the 4th switch (T
4) and the 4th diode (D
4) inverse parallel, the first switch (T
1) and second switch (T
2) series connection formation first brachium pontis, the 3rd switch (T
3) and the 4th switch (T
4) series connection formation second brachium pontis; First switch (the T
1) and the 3rd switch (T
3) the upper end and the second electric capacity (C
2) positive pole link to each other second switch (T
2) and the 4th switch (T
4) the lower end and the second electric capacity (C
2) negative pole link to each other.
6. as claim 2,3 or 5 described three-phase power electronics transformer for power distribution, it is characterized in that described switch is full-control type power electronic switching device IGBT, IGCT or GTO.
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|---|---|---|---|
| CN 201010117552 CN101795080A (en) | 2010-03-03 | 2010-03-03 | Three-phase power electronics transformer for power distribution |
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| CN102055348A (en) * | 2010-12-24 | 2011-05-11 | 东南大学 | Voltage reducing power electronic transformer for distribution network |
| CN102201737A (en) * | 2011-03-18 | 2011-09-28 | 中国电力科学研究院 | High-order energy gaining voltage conversion circuit |
| CN102223078A (en) * | 2011-06-08 | 2011-10-19 | 清华大学 | Power electronic transformer aiming at distribution network and control method of power electronic transformer |
| WO2012093049A2 (en) * | 2011-01-03 | 2012-07-12 | Sma Solar Technology Ag | Method for operating an inverter, and control device |
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| CN103490639A (en) * | 2013-09-27 | 2014-01-01 | 国家电网公司 | Flexible distribution transformer based on full flexible control |
| CN104767212A (en) * | 2015-02-13 | 2015-07-08 | 国家电网公司 | Hybrid power electronic transformer |
| CN104767212B (en) * | 2015-02-13 | 2017-01-11 | 国家电网公司 | Hybrid power electronic transformer |
| CN106324424A (en) * | 2016-10-31 | 2017-01-11 | 广西电网有限责任公司电力科学研究院 | Method for analyzing H bridge topology state of power electronic transformer |
| CN106533189A (en) * | 2016-11-25 | 2017-03-22 | 中国科学院电工研究所 | Power electronic transformer and control method thereof |
| CN107966626A (en) * | 2017-12-01 | 2018-04-27 | 中国科学院电工研究所 | A kind of electric power electric transformer power module test system |
| WO2021017887A1 (en) * | 2019-07-29 | 2021-02-04 | 南京南瑞继保工程技术有限公司 | Alternating current conversion device |
| CN111245269A (en) * | 2020-03-02 | 2020-06-05 | 东南大学 | Modularized multi-level inverter based on micro energy storage unit |
| CN113162454B (en) * | 2021-05-07 | 2023-10-31 | 东北大学 | Three-phase passive lossless soft switch inverter circuit |
| CN113162454A (en) * | 2021-05-07 | 2021-07-23 | 东北大学 | Three-phase passive lossless soft switch inverter circuit |
| CN116614000A (en) * | 2023-05-30 | 2023-08-18 | 洛阳理工学院 | Vehicle-mounted power electronic transformer structure and stable operation control method thereof |
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Application publication date: 20100804 |