CN104617806A - Bidirectional energy flow Z-source three-phase converter - Google Patents
Bidirectional energy flow Z-source three-phase converter Download PDFInfo
- Publication number
- CN104617806A CN104617806A CN201510044636.0A CN201510044636A CN104617806A CN 104617806 A CN104617806 A CN 104617806A CN 201510044636 A CN201510044636 A CN 201510044636A CN 104617806 A CN104617806 A CN 104617806A
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- China
- Prior art keywords
- source
- electric capacity
- energy flow
- switching tube
- converter
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- 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
- H02M7/66—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal
- H02M7/68—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters
- H02M7/72—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/79—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/797—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
The invention discloses a bidirectional energy flow Z-source three-phase converter. The bidirectional energy flow Z-source three-phase converter is composed of a Z-source impedance network and a three-phase conversion circuit; a bidirectional energy flow Z-source impedance network is composed of a DC (direct current) voltage source, capacitors C1, C2 and C3, inductors L1 and L2, a switching tube Q7 and a diode D; the improved bidirectional energy flow Z-source impedance network is composed of the DC voltage source, the capacitors C1, C2 and C3, the inductors L1 and L2, and switching tubes Q7 and Q8. When the bidirectional energy flow Z-source three-phase converter is in a non-through state, current in the Z-source network can flow into the capacitors through one switching tube, so that the problem that a traditional Z-source inverter, when in an underloading state, may lead to an abnormal system state. The bidirectional energy flow Z-source three-phase converter has the advantage of being capable of working in a rectification state as well as an inversion state during grid connection of the inverter due to the fact that system energy can flow in two directions. The bidirectional energy flow Z-source three-phase converter has a broad application prospect in the fields of new energy power generation grid connection and the like.
Description
Technical field
The present invention relates to bi-directional energy flow Z source three-phase inverter, belong to electronic power converter modulation and control field.
Background technology
Z source converter is a kind of novel power electronics topology proposed in recent years, and the theoretical research about Z source converter is rapid with its practical application development.Z source converter is in traditional passive inversion, and feed-back type active inversion occasion, at photovoltaic generation, has a wide range of applications in fuel cell power generation, variable frequency ac drive.Z source converter is single level system, and structure is simple, and efficiency is high, and system reliability improves.
The feature of Z source converter is different from conventional transducers.One, its DC side power supply both can be voltage source, also can be current source.Can adapt to the wide variation of input supply voltage, DC side power supply can be battery, diode rectifier, fuel cell pack, photovoltaic cell etc.Two, there is boosting and dropping voltage characteristic, do not need to increase the output voltage that prime translation circuit just can realize in a big way, its range of application is increased.Three, the upper and lower switching tube of homophase brachium pontis need not add dead band, and Z source converter allows homophase bridge arm direct pass.Improve reliability and the waveform quality of system.
When load for Z source converter is transformed to underloading by heavy duty, probably there is abnormal operating state, the working condition of influential system, make the carrying load ability of system poor, generation in order to avoid this situation often increases Z source network inductance value, but the volume of system and cost can be made so all to increase; Z source traditional when DC side power supply is the energy-storage travelling wave tube such as storage battery or super capacitor in addition can not realize the feedback of energy.Thus result in promoting the use of of the range of application in Z source.
Summary of the invention
The object of the invention is to solve the problem that known Z source converter in use runs into, abnormal operating state can not be avoided and the feedback of energy can not be realized.Two-way flow Z source converter is the present invention proposes in order to overcome the above problems.
Two-way flow Z source converter of the present invention mainly comprises Z source impedance network, three-phase inverter.
In order to avoid the abnormal operating state of Z source converter, traditional Z source converter adopts switching tube is replaced diode, then increase a diode at direct current source, increased electric capacity newly.Newly-increased diode be consider DC power supply be likely photovoltaic cell or fuel cell time, electric current can not reflux and design.Electric capacity in order to when being with underloading for reverse current provides loop and design.This topology can solve the impact that abnormal operating state causes to system.But the Z source converter of above-mentioned improvement does not realize energy in bidirectional flow truly, when DC side power supply is the energy-storage travelling wave tube such as storage battery or super capacitor, under certain condition, need to carry out charging operations to it, can require that the energy of transducer side can feed back in DC power supply.Set out based on this point, two-way flow Z source converter be optimized, change diode in the Z source of two-way flow into power switch pipe, when DC power supply be photovoltaic array or fuel cell etc. can not accept feedback current time, switching tube turn off.When DC power supply is the endergonic devices of energy such as storage battery, switching tube work, system capacity can be passed through switching tube and feeds back in power supply.Thus truly can realize the two-way flow of energy and the impact that abnormal operating state causes to system can be solved.
Bi-directional energy flow Z source three-phase inverter, comprises Z source network and three-phase translation circuit, and described three-phase translation circuit is by multiple switching tube Q
1, Q
2, Q
3, Q
4, Q
5, Q
6composition, and three-phase translation circuit is with filter inductance and load, described Z source network is connected in parallel on three-phase translation circuit, and described Z source network comprises direct voltage source, backflow control element, the first electric capacity C
1, the second electric capacity C
2, the 3rd electric capacity C
3, the first inductance L
1with the second inductance L
2with switching tube Q
7, the positive pole of described backflow control element one termination power; The other end is connected to switching tube Q respectively
7emitter and the 3rd electric capacity C
3, described switching tube Q
7collector electrode be connected to the first inductance L
1with the first electric capacity C
1, described 3rd electric capacity C
3the other end be connected to the negative pole of direct voltage source, the negative pole of described direct voltage source is also connected with the second electric capacity C
2with the second inductance L
2, the first inductance L
1the other end meet the second electric capacity C respectively
2with the input of three-phase translation circuit; Second inductance L
2the other end and the first electric capacity C
1the other end is linked into another input of three-phase inverter again after connecting.
Described direct voltage source is not rechargable power supplies, and described backflow control element is diode D.
Described direct voltage source is rechargable power supplies, and described backflow control element is switching tube Q
8.
The invention has the beneficial effects as follows: by improving traditional Z source converter, Z source converter both can have been avoided to be operated in abnormal operating state, thus caused system bulk, the increase of cost and weight.Can determine whether can charge to DC side power supply by the break-make of control switch pipe again.Two-way flow Z source implementation method is simple flexibly, can improve the reliability of total system, contribute to extensively promoting the use of of converter, especially in the use in the field of new forms of energy.
Accompanying drawing explanation
Fig. 1 is the main circuit structure figure of traditional Z source three-phase inverter.
Fig. 2 is the main circuit structure figure of bi-directional energy flow Z source three-phase inverter.
Fig. 3 is the main circuit structure figure of modified model two-way Z source three-phase inverter.
Fig. 4 is that converter is operated in nought state.
Fig. 5 is that converter is operated in active 1.
Fig. 6 is that converter is operated in active 2.
Fig. 7 is that converter is operated in active 3.
Fig. 8 is that converter is operated in active 4.
Fig. 9 is that converter is operated in nought state.
Figure 10 is that converter is operated in pass-through state 1.
Figure 11 is that converter is operated in pass-through state 2.
Figure 12 is the non-pass-through state under converter is operated in rectification mode.
Figure 13 is the pass-through state under converter is operated in rectification mode.
Embodiment
Fig. 1 is the main circuit structure figure of traditional Z source three-phase inverter, and Z source three-phase inverter has boosting and dropping voltage characteristic, does not need to increase the output voltage that prime translation circuit just can realize in a big way, its range of application is increased.The upper and lower switching tube of brachium pontis of same phase need not add dead band simultaneously, and Z source converter allows homophase bridge arm direct pass.Improve reliability and the waveform quality of system.
Fig. 2 is the main circuit structure figure of bi-directional energy flow Z source three-phase inverter, in order to avoid the appearance of abnormal operating state, adopts the diode D in switching device replacement traditional Z source, adds diode D at direct current source
1, increased electric capacity C newly
3.D
1be consider DC power supply be likely photovoltaic cell or fuel cell time, electric current can not reflux and arrange.Electric capacity C
3for reverse current provides loop and design when being circuit band underloading.This topology can solve the impact that abnormal operating state causes to system.
Fig. 3 is the main circuit structure figure of the two-way Z source converter of modified model, if DC side power supply is the energy-storage travelling wave tube such as storage battery or super capacitor, under certain condition, needs to carry out charging operations to it, can require that the energy of transducer side can feed back in DC power supply.Now by diode D
1change power switch pipe Q into
8, as DC power supply U
dcfor photovoltaic array, fuel cell etc. can not accept feedback current time, switching tube Q
8turn off.As DC power supply U
dcduring for energy endergonic devices such as storage batterys, switching tube Q
8work, system capacity can be passed through switching tube Q
8feed back in power supply Udc.Because the energy of system can two-way flow, therefore three-phase inverter can be operated in rectification and inversion two kinds of operating states.
Fig. 4 is that converter is operated in nought state power supply and electric capacity C
3start to Z net electric capacity C
1with electric capacity C
2charging.
Fig. 5 is that converter is operated in active wherein i
l> i
in/ 2, input current of inverter i
in> 0.Active switch conducting.Power supply U
dcwith electric capacity C
3to Z source network energy-storage travelling wave tube and load supplying.
Fig. 6 is that converter is operated in active wherein i
l> i
in/ 2, input current of inverter i
in> 0 still meets, and the electric capacity of Z source network starts to power to the load.
Fig. 7 is that converter is operated in active 0 < i
l< i
in/ 2 do not meet diode current continuous print necessary condition.I
inz< 0, switching tube Q
7conducting, flows into the reverse direction current flow of Z net.Before Z net, both end voltage is approximately equal to DC source voltage, and circuit is normally worked.
Fig. 8 is that converter is operated in active, works as i
l< 0, i
inz< 0, electric capacity C
1and C
2electric discharge.
Fig. 9 is that converter is operated in nought state, Q
9be still conducting state, i
l< 0, i
inz< 0.
Figure 10 is that converter is operated in pass-through state, after nought state, add through connect signal, because the electric current on inductance can not suddenly change, and i
l< 0, i
inzthe whole conducting of fly-wheel diode of < 0 converter active device, three-phase bridge DC voltage is 0.
Figure 11 is that converter is operated in pass-through state, and after nought state, after Z net inductive current is oppositely reduced to 0, add the switching device conducting simultaneously of through connect signal and same brachium pontis, now three-phase bridge DC voltage is 0.
Figure 12 is the non-pass-through state under converter is operated in rectification mode, the Q when being operated in non-pass-through state under rectification mode
7and Q
8switching tube conducting.
Figure 13 is the pass-through state under converter is operated in rectification mode, the Q when being operated in non-pass-through state under rectification mode
7and Q
8switching tube turns off.
In sum: the invention solves following problem: 1. cause system bulk when avoiding Z source converter to be operated in abnormal operating state, the problem of the increase of cost and weight.2. can determine whether can charge to DC side power supply by the break-make of control switch pipe.Thus truly achieve the two-way flow of energy.
Claims (3)
1. bi-directional energy flow Z source three-phase inverter, comprises Z source network and three-phase translation circuit, it is characterized in that: described three-phase translation circuit is by multiple switching tube (Q
1, Q
2, Q
3, Q
4, Q
5, Q
6) composition, and three-phase translation circuit is with filter inductance and load, described Z source network is connected in parallel on three-phase translation circuit, and described Z source network comprises direct voltage source, backflow control element, the first electric capacity (C
1), the second electric capacity (C
2), the 3rd electric capacity (C
3), the first inductance (L
1) and the second inductance (L
2) and switching tube (Q
7), the positive pole of described backflow control element one termination power; The other end is connected to switching tube (Q respectively
7) emitter and the 3rd electric capacity (C
3), described switching tube (Q
7) collector electrode be connected to the first inductance (L
1) and the first electric capacity (C
1), described 3rd electric capacity (C
3) the other end be connected to the negative pole of direct voltage source, the negative pole of described direct voltage source is also connected with the second electric capacity (C
2) and the second inductance (L
2), the first inductance (L
1) the other end meet the second electric capacity (C respectively
2) and the input of three-phase translation circuit; Second inductance (L
2) other end and the first electric capacity (C
1) other end is linked into another input of three-phase inverter after connecting again.
2. bi-directional energy flow Z source according to claim 1 three-phase inverter, is characterized in that: described direct voltage source is not rechargable power supplies, and described backflow control element is diode (D).
3. bi-directional energy flow Z source according to claim 1 three-phase inverter, it is characterized in that: described direct voltage source is rechargable power supplies, described backflow control element is switching tube (Q
8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510044636.0A CN104617806A (en) | 2015-01-26 | 2015-01-26 | Bidirectional energy flow Z-source three-phase converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510044636.0A CN104617806A (en) | 2015-01-26 | 2015-01-26 | Bidirectional energy flow Z-source three-phase converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104617806A true CN104617806A (en) | 2015-05-13 |
Family
ID=53152132
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510044636.0A Pending CN104617806A (en) | 2015-01-26 | 2015-01-26 | Bidirectional energy flow Z-source three-phase converter |
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| Country | Link |
|---|---|
| CN (1) | CN104617806A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105186909A (en) * | 2015-08-26 | 2015-12-23 | 齐鲁工业大学 | Enhanced Z-source inverter and working method thereof |
| CN107834880A (en) * | 2017-11-13 | 2018-03-23 | 齐鲁工业大学 | A kind of new Z-source inverter topological structure |
| CN108092539A (en) * | 2018-01-12 | 2018-05-29 | 哈尔滨理工大学 | A kind of enhanced high-performance Z-source inverter |
| CN109004845A (en) * | 2018-09-25 | 2018-12-14 | 河北科技大学 | The quasi- two-way full-bridge DC-DC converter in the source Z |
Citations (4)
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| DE102006050942A1 (en) * | 2006-05-10 | 2007-11-15 | Sack, Lothar, Dr.-Ing. | Power converter`s circuit arrangement, has controllable switching unit switched parallel at input side of each blocking diode so that direction of current is opposite to diode and bi-directional operation of power converter is enabled |
| CN101599710A (en) * | 2009-07-24 | 2009-12-09 | 南京航空航天大学 | Monopole inverter capable of boosting voltage |
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2015
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Patent Citations (4)
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| DE102006050942A1 (en) * | 2006-05-10 | 2007-11-15 | Sack, Lothar, Dr.-Ing. | Power converter`s circuit arrangement, has controllable switching unit switched parallel at input side of each blocking diode so that direction of current is opposite to diode and bi-directional operation of power converter is enabled |
| JP2010273512A (en) * | 2009-05-25 | 2010-12-02 | Toyota Motor Corp | Motor drive system and vehicle |
| CN101599710A (en) * | 2009-07-24 | 2009-12-09 | 南京航空航天大学 | Monopole inverter capable of boosting voltage |
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Non-Patent Citations (1)
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| 丁新平等: "适应负载大范围变动的高性能Z-源逆变器", 《电工技术学报》 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105186909A (en) * | 2015-08-26 | 2015-12-23 | 齐鲁工业大学 | Enhanced Z-source inverter and working method thereof |
| CN107834880A (en) * | 2017-11-13 | 2018-03-23 | 齐鲁工业大学 | A kind of new Z-source inverter topological structure |
| CN108092539A (en) * | 2018-01-12 | 2018-05-29 | 哈尔滨理工大学 | A kind of enhanced high-performance Z-source inverter |
| CN109004845A (en) * | 2018-09-25 | 2018-12-14 | 河北科技大学 | The quasi- two-way full-bridge DC-DC converter in the source Z |
| CN109004845B (en) * | 2018-09-25 | 2023-08-04 | 河北科技大学 | quasi-Z source bidirectional full-bridge DC-DC converter |
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Application publication date: 20150513 |