CN102664547A - Parallel cascade inverter - Google Patents
Parallel cascade inverter Download PDFInfo
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- CN102664547A CN102664547A CN2012101351097A CN201210135109A CN102664547A CN 102664547 A CN102664547 A CN 102664547A CN 2012101351097 A CN2012101351097 A CN 2012101351097A CN 201210135109 A CN201210135109 A CN 201210135109A CN 102664547 A CN102664547 A CN 102664547A
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Abstract
The invention discloses a parallel cascade inverter. A multi-level inverter is formed by cascading N basic modules and four filtering inductors; N is an integer of more than 1; each basic module is a double-H-bridge unit; each H bridge unit consists of two bridge arms; each bridge arm is formed by connecting two switching tubes in series; a connecting point between the two switching tubes is a middle point of each bridge arm; each middle point is connected with an output end; the two bridge arms are connected in parallel to the two ends of a power supply or a capacitor; the N basic modules and the four inductors construct a single-phase parallel cascade inverter; the output ends of primary and tail basic modules are connected with a corresponding filtering inductor respectively; and three single-phase parallel cascade inverters construct a three-phase parallel cascade inverter. Under the condition that the quantity of output levels is the same as that of the conventional cascade inverter, the discharge current capability is increased by one time, and corresponding power capacity is increased by one time; but the voltage and current born by each switching tube do not change.
Description
Technical field
The present invention relates to a kind of many level power inversion transformation technique, relate in particular to a kind of parallelly connected cascaded inverter of many level power conversion inverter.
Background technology
Many level power converter technique and thought thereof are focuses in the high-power application study in recent years.Because medium voltate, high-power needs, cascaded inverter are widely used in aspects such as high-tension Motor Drive, large power supply, high-power reactive power compensation and active power filtering.Traditional cascaded inverter topology is to be basic module with conventional full bridge unit (H bridge unit), and the cascade through these modules comes synthesising output voltage then, and the module of cascade is many more, and synthetic voltage is just high more.
But, along with the continuous increase of power system capacity, need higher voltage and bigger electric current, and traditional cascaded inverter can not satisfy current demand owing to receive the restriction of power switch pipe through-current capability.Can realize higher voltage through the more module of cascade, but, realize that bigger electric current will run into very big difficulty owing to receive the restriction of power device through-current capability; If adopt the more power switch pipe of high power capacity, then the cost of power switch pipe is too high, and system cost increases, and is difficult in maintenance.
Summary of the invention
The object of the invention is exactly in order to address the above problem a kind of parallelly connected cascaded inverter to be provided, and it is a basic module with the dual H-bridge unit, through cascade more multimode realize more high voltage, realize bigger electric current through parallel connection.Compare with traditional cascaded inverter, obtaining under the condition of identical voltage, its through-current capability can double, and corresponding power capacity will double, but voltage that power switch pipe bears and the electric current that passes through do not change.
To achieve these goals, the present invention adopts following technical scheme:
A kind of parallelly connected cascaded inverter is characterized in that, it is with N basic module and four multi-electrical level inverters that the filter inductance cascade constitutes; Said basic module is the dual H-bridge unit, and said H bridge unit is made up of two brachium pontis, and each brachium pontis has two switching tubes to be composed in series, and the tie point between two switching tubes is the mid point of brachium pontis, and this each mid point is connected with an output; Said these four brachium pontis are connected in parallel in the two ends of power supply or electric capacity; Saidly form the parallel single-phase cascaded inverter by N basic module and four filter inductances, N is the integer greater than 1, elementaryly is connected with a corresponding filter inductance respectively with the output of final stage basic module; Connected mode between the basic module is different, realizes different topological structures.
First kind of topological structure of said parallel single-phase cascaded inverter: the mid point of second brachium pontis of said first basic module is connected with the mid point of first brachium pontis of second basic module; The mid point of the 4th brachium pontis of said first basic module is connected with the mid point of the 3rd brachium pontis of second basic module; And the like, second brachium pontis of N-1 basic module is connected with first brachium pontis of N basic module and the mid point of the 3rd brachium pontis respectively with the mid point of the 4th brachium pontis;
The mid point of first brachium pontis of first basic module connects the end of inductance A; The mid point of the 3rd brachium pontis of first basic module connects the end of inductance C; The other end of inductance A is connected with the other end of inductance C; Last basic module i.e. the end of the mid point connection inductance B of second brachium pontis of N basic module, and the mid point of the 4th brachium pontis of N basic module connects the end of inductance D, and the other end of inductance B is connected with the other end of inductance D.The tie point of inductance A and inductance C, the tie point of inductance B and inductance D can connect load as single-phase output.
Second kind of topological structure of said parallel single-phase cascaded inverter: the mid point of first brachium pontis of said first basic module is connected with the mid point of second brachium pontis of second basic module; The mid point of the 3rd brachium pontis of said first basic module is connected with the mid point of the 4th brachium pontis of second basic module; And the like, first brachium pontis of N-1 basic module is connected with second brachium pontis of N basic module and the mid point of the 4th brachium pontis respectively with the mid point of the 3rd brachium pontis;
The mid point of second brachium pontis of first basic module connects the end of inductance B; The mid point of the 4th brachium pontis of first basic module connects the end of inductance D; The other end of inductance B is connected with the other end of inductance D, and last basic module i.e. the end of the mid point connection inductance A of first brachium pontis of N basic module, and the mid point of the 3rd brachium pontis of N basic module connects the end of inductance C; The other end of inductance A is connected with the other end of inductance C; The tie point of inductance B and inductance D, the tie point of inductance A and inductance C can connect load as single-phase output.
Said three parallel single-phase cascaded inverters have been formed the parallel three phase cascaded inverter; The inductance B of said three parallel single-phase cascaded inverters and the tie point of inductance D link together; Constitute the star-like connection of parallel three phase cascaded inverter; The inductance A of said three parallel single-phase cascaded inverters and the tie point of C connect threephase load as three outputs of inverter.
Said three parallel single-phase cascaded inverters have been formed the parallel three phase cascaded inverter; The inductance A of said three parallel single-phase cascaded inverters and the tie point of inductance C link together; Constitute the star-like connection of parallel three phase cascaded inverter; The inductance B of said three parallel single-phase cascaded inverters and the tie point of D connect threephase load as three outputs of inverter.
Said three parallel single-phase cascaded inverters join end to end, and the triangular form that constitutes the parallel three phase cascaded inverter connects.
Star-like and the triangular form of said parallel three phase cascaded inverter is connected also has two kinds of topological structures respectively.
Said all switching tubes are that the switching tube with inverse parallel diode in the body is perhaps formed by diodeless switching tube and diode combinations in the body.
Beneficial effect of the present invention: a kind of parallelly connected cascaded inverter is a basic module with the dual H-bridge unit, through cascade more multimode realize more high voltage, realize bigger electric current through parallel connection.Compare with traditional cascaded inverter, obtaining under the condition of identical voltage, its through-current capability can double, and corresponding power capacity will double, but voltage that power switch pipe bears and the electric current that passes through do not change.
Description of drawings
The basic module that Fig. 1 forms for the dual H-bridge unit;
Fig. 2 is a kind of topological structure of parallel single-phase cascaded inverter;
Fig. 3 is the another kind of topological structure of parallel single-phase cascaded inverter;
Fig. 4 is a kind of star-like connection of parallel three phase cascaded inverter;
Fig. 5 is the another kind of star-like connection of parallel three phase cascaded inverter;
Fig. 6 is that a kind of angle type of parallel three phase cascaded inverter connects;
Fig. 7 is that the another kind of angle type of parallel three phase cascaded inverter connects.
Wherein, 1. brachium pontis, 21. first basic modules, 22. second basic modules, N basic module of 2N., 3. inductance, 4. load, 5. threephase load, 6. switching tube.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is described further.
As shown in Figure 1, this topological structure comprises two H bridge unit i.e. four brachium pontis and a direct voltage source.These four brachium pontis are followed successively by brachium pontis 1A, brachium pontis 1B, brachium pontis 1C, brachium pontis 1D; Each brachium pontis 1 has two switching tubes 6 to be composed in series; The mid point of said brachium pontis 1A i.e. two switching tube 6 tie points is an output terminals A; The mid point of the said brachium pontis 1B i.e. tie point of two switching tubes 6 is output B; The mid point of the said brachium pontis 1C i.e. tie point of two switching tubes 6 is output C, and the mid point of the said brachium pontis 1D i.e. tie point of two switching tubes 6 is output D.Brachium pontis 1A, brachium pontis 1B, brachium pontis 1C, brachium pontis 1D are connected in same direct voltage source two ends in parallel.
Said switching tube is that the switching tube with inverse parallel diode in the body is perhaps formed by diodeless switching tube and diode combinations in the body.
As shown in Figure 2, this topological structure comprises N (N＞1) individual basic module and four filter inductance A, B, C, D.The output B of first basic module connects the output terminals A of second basic module; The output D of first basic module connects the output C of second basic module; ...; By that analogy, the output B of N-1 basic module connects the output terminals A of N basic module, and the output D of N-1 basic module connects the output C of N basic module.
The output terminals A of first basic module connects the end of inductance 3A, and the output C of first basic module connects the end of inductance 3C, and the other end of inductance 3A is connected with the other end of inductance 3C.Last basic module i.e. output B of N basic module connects the end of inductance 3B, N basic module the end of output D connection inductance 3D, the other end of inductance 3B is connected with the other end of inductance 3D.The tie point of inductance 3A and inductance 3C, the tie point of inductance 3B and inductance 3D can connect load 4 as single-phase output.
As shown in Figure 3, this topological structure also comprises N (N＞1) individual basic module and four filter inductance A, B, C, D.The output terminals A of first basic module connects the output B of second basic module; The output C of first basic module connects the output D of second basic module; ...; By that analogy, the output terminals A of N-1 basic module connects the output B of N basic module, and the output C of N-1 basic module connects the output D of N basic module.
The output B of first basic module connects the end of inductance 3B, and the output D of first basic module connects the end of inductance 3D, and the other end of inductance 3B is connected with the other end of inductance 3D.Last basic module i.e. output terminals A of N basic module connects the end of inductance 3A, N basic module the end of output C connection inductance 3C, the other end of inductance 3A is connected with the other end of inductance 3C.The tie point of inductance 3B and inductance 3D, the tie point of inductance 3A and inductance 3C can connect load 4 as single-phase output.
According to above-mentioned annexation, two kinds of topological structures of parallel single-phase cascaded inverter have just been formed.
All switching tubes 6 of said parallel single-phase cascaded inverter are perhaps formed by diodeless switching tube and diode combinations in the body for the switching tube with inverse parallel diode in the body.
Three parallel single-phase cascaded inverters can constitute a parallel three phase cascaded inverter.In Fig. 4; Link together the tie point of the inductance 3B of three parallel single-phase cascaded inverters and inductance 3D; Constitute the star-like connection of parallel three phase cascaded inverter; The inductance 3A of three parallel single-phase cascaded inverters and the tie point of 3C connect threephase load 5 as three outputs of inverter.In Fig. 5; Link together the tie point of the inductance 3A of three parallel single-phase cascaded inverters and inductance 3C; Constitute the star-like connection of parallel three phase cascaded inverter; The inductance 3B of three parallel single-phase cascaded inverters and the tie point of 3D connect threephase load 5 as three outputs of inverter.
In Fig. 6,7, three parallel single-phase cascaded inverters join end to end, and the triangular form that constitutes the parallel three phase cascaded inverter connects.
All switching tubes 6 of said parallel three phase cascaded inverter are perhaps formed by diodeless switching tube and diode combinations in the body for the switching tube with inverse parallel diode in the body.
Though the above-mentioned accompanying drawing specific embodiments of the invention that combines is described; But be not restriction to protection range of the present invention; One of ordinary skill in the art should be understood that; On the basis of technical scheme of the present invention, those skilled in the art need not pay various modifications that creative work can make or distortion still in protection scope of the present invention.
Claims (8)
1. a parallelly connected cascaded inverter is characterized in that, it is with N basic module and four multi-electrical level inverters that the filter inductance cascade constitutes; Said basic module is the dual H-bridge unit, and said H bridge unit is made up of two brachium pontis, and each brachium pontis has two switching tubes to be composed in series, and the tie point between two switching tubes is the mid point of brachium pontis, and this each mid point is connected with an output; Said these four brachium pontis are connected in parallel in the two ends of power supply or electric capacity; Saidly form the parallel single-phase cascaded inverter by N basic module and four filter inductances, N is the integer greater than 1, elementaryly is connected with a corresponding filter inductance respectively with the output of final stage basic module; Connected mode between the basic module is different, realizes different topological structures.
2. parallelly connected according to claim 1 cascaded inverter; It is characterized in that; First kind of topological structure of said parallel single-phase cascaded inverter: the mid point of second brachium pontis of said first basic module is connected with the mid point of first brachium pontis of second basic module; The mid point of the 4th brachium pontis of said first basic module is connected with the mid point of the 3rd brachium pontis of second basic module; And the like, second brachium pontis of N-1 basic module is connected with first brachium pontis of N basic module and the mid point of the 3rd brachium pontis respectively with the mid point of the 4th brachium pontis;
The mid point of first brachium pontis of first basic module connects the end of inductance A; The mid point of the 3rd brachium pontis of first basic module connects the end of inductance C; The other end of inductance A is connected with the other end of inductance C; Last basic module i.e. the end of the mid point connection inductance B of second brachium pontis of N basic module, and the mid point of the 4th brachium pontis of N basic module connects the end of inductance D, and the other end of inductance B is connected with the other end of inductance D.The tie point of inductance A and inductance C, the tie point of inductance B and inductance D can connect load as single-phase output.
3. parallelly connected according to claim 1 cascaded inverter; It is characterized in that; Second kind of topological structure of said parallel single-phase cascaded inverter: the mid point of first brachium pontis of said first basic module is connected with the mid point of second brachium pontis of second basic module; The mid point of the 3rd brachium pontis of said first basic module is connected with the mid point of the 4th brachium pontis of second basic module; And the like, first brachium pontis of N-1 basic module is connected with second brachium pontis of N basic module and the mid point of the 4th brachium pontis respectively with the mid point of the 3rd brachium pontis;
The mid point of second brachium pontis of first basic module connects the end of inductance B; The mid point of the 4th brachium pontis of first basic module connects the end of inductance D; The other end of inductance B is connected with the other end of inductance D, and last basic module i.e. the end of the mid point connection inductance A of first brachium pontis of N basic module, and the mid point of the 3rd brachium pontis of N basic module connects the end of inductance C; The other end of inductance A is connected with the other end of inductance C; The tie point of inductance B and inductance D, the tie point of inductance A and inductance C can connect load as single-phase output.
4. like the said parallelly connected cascaded inverter of claim 2; It is characterized in that; Said three parallel single-phase cascaded inverters have been formed the parallel three phase cascaded inverter, and the inductance B of said three parallel single-phase cascaded inverters and the tie point of inductance D link together, and constitute the star-like connection of parallel three phase cascaded inverter; The inductance A of said three parallel single-phase cascaded inverters and the tie point of C connect threephase load as three outputs of inverter.
5. like the said parallelly connected cascaded inverter of claim 3; It is characterized in that; Said three parallel single-phase cascaded inverters have been formed the parallel three phase cascaded inverter, and the inductance A of said three parallel single-phase cascaded inverters and the tie point of inductance C link together, and constitute the star-like connection of parallel three phase cascaded inverter; The inductance B of said three parallel single-phase cascaded inverters and the tie point of D connect threephase load as three outputs of inverter.
6. like claim 2 or 3 said parallelly connected cascaded inverters, it is characterized in that said three parallel single-phase cascaded inverters join end to end, the triangular form that constitutes the parallel three phase cascaded inverter connects.
7. like claim 4 or 5 said parallelly connected cascaded inverters, it is characterized in that the star-like and triangular form of said parallel three phase cascaded inverter is connected also has two kinds of topological structures respectively.
8. parallelly connected according to claim 1 cascaded inverter is characterized in that, said all switching tubes are that the switching tube with inverse parallel diode in the body is perhaps formed by diodeless switching tube and diode combinations in the body.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108111036A (en) * | 2018-02-28 | 2018-06-01 | 苏州唯控汽车科技有限公司 | The more level tandem type inversion output equipments of single group battery |
| CN110266029A (en) * | 2019-06-03 | 2019-09-20 | 杭州模储科技有限公司 | A kind of modular multilevel energy-storage system |
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| CN200980045Y (en) * | 2006-12-01 | 2007-11-21 | 华中科技大学 | A transformer-type high-voltage and large-power converter without imputing and outputting based on a cascade structure |
| KR20090078231A (en) * | 2008-01-14 | 2009-07-17 | 주식회사 준성이엔알 | 3-phase ihcml inverter |
| CN101917016A (en) * | 2010-07-21 | 2010-12-15 | 北京交通大学 | Energy-saving type cascade multilevel photovoltaic grid-connected generating control system |
| CN102064555A (en) * | 2010-12-31 | 2011-05-18 | 中电普瑞科技有限公司 | Chain type STATCOM (Static Synchronous Compensator) chain unit bypass structure with mechanical switch |
| CN102195289A (en) * | 2011-07-18 | 2011-09-21 | 华北电力大学 | Cascade-structure-based hybrid active power filter |
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2012
- 2012-05-03 CN CN201210135109.7A patent/CN102664547B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN200980045Y (en) * | 2006-12-01 | 2007-11-21 | 华中科技大学 | A transformer-type high-voltage and large-power converter without imputing and outputting based on a cascade structure |
| KR20090078231A (en) * | 2008-01-14 | 2009-07-17 | 주식회사 준성이엔알 | 3-phase ihcml inverter |
| CN101917016A (en) * | 2010-07-21 | 2010-12-15 | 北京交通大学 | Energy-saving type cascade multilevel photovoltaic grid-connected generating control system |
| CN102064555A (en) * | 2010-12-31 | 2011-05-18 | 中电普瑞科技有限公司 | Chain type STATCOM (Static Synchronous Compensator) chain unit bypass structure with mechanical switch |
| CN102195289A (en) * | 2011-07-18 | 2011-09-21 | 华北电力大学 | Cascade-structure-based hybrid active power filter |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108111036A (en) * | 2018-02-28 | 2018-06-01 | 苏州唯控汽车科技有限公司 | The more level tandem type inversion output equipments of single group battery |
| CN110266029A (en) * | 2019-06-03 | 2019-09-20 | 杭州模储科技有限公司 | A kind of modular multilevel energy-storage system |
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