CN205595803U - Photovoltaic power generation system based on accurate Z source network of inductance of taking a percentage - Google Patents
Photovoltaic power generation system based on accurate Z source network of inductance of taking a percentage Download PDFInfo
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- CN205595803U CN205595803U CN201620130425.9U CN201620130425U CN205595803U CN 205595803 U CN205595803 U CN 205595803U CN 201620130425 U CN201620130425 U CN 201620130425U CN 205595803 U CN205595803 U CN 205595803U
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- inductance
- diode
- boost
- tap
- inverter bridge
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- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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Abstract
The utility model discloses a photovoltaic power generation system based on accurate Z source network of inductance of taking a percentage, boost boost circuit realize that maximum power trails, and the DCAC transform is realized to PWM contravariant bridge, the accurate Z source network of the inductance of taking a percentage has replaced traditional Z source contravariant network, and the advantage of accurate Z source contravariant network has been inherited to this network, and through adjusting the position that direct duty cycle and inductance were taken a percentage, can improve the ability of stepping up greatly, has promoted photovoltaic power generation's efficiency.
Description
Technical field
This utility model relates to a kind of photovoltaic generating system based on tap inductor quasi-Z source network, belongs to distributed power generation
With intelligent grid field.
Background technology
The utilization of solar energy is to alleviate the global energy important channel with problem of environmental pollution in short supply, and photovoltaic generation is exactly near
One of focus studied over Nian.The load supplying higher to DC voltage, battery tension is the most relatively low, can not meet its power supply
Demand.Use the most ripe electric electronic current change technology can convert solar energy into electric energy, and then realize voltage transformation and merit
Rate controls.
Z-source inverter overcomes the deficiency of conventional voltage source inventer.Traditional Z source inventer is with defeated at three phase inverter bridge
Enter and between power supply, increase what a passive network obtained.Passive network comprises and connects in " X " mode and the inductance L of high degree of symmetry1、
L2With electric capacity C1、C2.It is by controlling the straight-through time of brachium pontis, it is possible to realize the conversion of single-stage lifting/voltage reducing；Due to bridge arm direct pass
Become a kind of normal mode of operation of inverter, the straight-through problem caused due to electromagnetic interference etc. will not be occurred to damage inverter bridge
Situation, improve the reliability of complete machine；Simultaneously as there is no the problem of dead area compensation, fundamentally avoid output voltage
The distortion of waveform.Based on above-mentioned advantage, Z-source inverter is widely used in grid-connected power generation system.
Quasi-Z-source inverter is to develop on the basis of traditional Z source inventer.Except having traditional Z source inventer
Outside feature, it also have continuous input current, inverter bridge and input power altogether, advantage that capacitance voltage stress is less.
But, Z-source inverter and quasi-Z-source inverter regulate busbar voltage, directly simply by controlling the bridge arm direct pass time
The restriction of logical time modulated ratio, excessive straight-through dutycycle can reduce modulation ratio and output voltage amplitude on the contrary, and increase
The voltage stress of brachium pontis switching tube and the harmonic content of output waveform.
Summary of the invention
The present utility model photovoltaic generating system based on tap inductor quasi-Z source network, tap inductor quasi-Z source network
Instead of traditional Z source inversion network, this network inherits the advantage of quasi-Z source inversion network, and by the straight-through dutycycle of regulation and
The position of inductance tap, can improve boost capability significantly, improve the efficiency of photovoltaic generation.
The technical solution of the utility model is: photovoltaic generating system based on tap inductor quasi-Z source network, including photovoltaic battle array
Row, Boost circuit, tap inductor quasi-Z source network, PWM inverter bridge, load；Photovoltaic array, Boost circuit, tap
Inductance quasi-Z source network, PWM inverter bridge, load are sequentially connected with, and the direct current energy of photovoltaic array output is for conversion into AC energy,
For load supplying；Boost circuit includes photovoltaic side storage capacitor C0, Boost boost inductance L0, Boost circuit switch
Device S0, Boost circuit diode VD0, DC side storage capacitor Cd；Tap inductor quasi-Z source network includes inductance L, two poles
Pipe VD1~ VD3, electric capacity C1And C2, tap inductor Lt, tap lead is by tap inductor LtIt is divided into inductance L1With inductance L2Two parts, electricity
Sense L1Umber of turn be N1, inductance L2Umber of turn be N2；PWM inverter bridge uses three-phase full-bridge inverter structure, including six
Individual switching device S1~S6And the anti-paralleled diode of each of which, switching device S1、S3、S5Colelctor electrode be connected inverse as PWM
Become the input anode of bridge, switching device S2、S4、S6Emitter stage be connected as the input negative terminal of PWM inverter bridge；Photovoltaic array with
Photovoltaic side storage capacitor C0It is connected in parallel, photovoltaic array output cathode and Boost boost inductance L0It is connected, Boost boost inductance L0
The other end and Boost circuit switching device S0Colelctor electrode, Boost circuit diode VD0Anode be connected, Boost
Booster circuit diode VD0Negative electrode and DC side storage capacitor CdOne end, inductance L one end be connected, the other end of inductance L
With diode VD1Anode, electric capacity C2One end be connected, diode VD1Negative electrode and electric capacity C1One end, tap inductor LtDefeated
Enter end to be connected, tap inductor LtOutfan and diode VD3Anode be connected, tap inductor LtTap lead and diode
VD2Anode be connected, diode VD2Negative electrode and diode VD3Negative electrode, electric capacity C2The other end, the input of PWM inverter bridge
Anode is connected, electric capacity C1The other end and photovoltaic array output negative pole, Boost circuit switching device S0Emitter stage, direct current
Side storage capacitor CdThe other end, PWM inverter bridge input negative terminal be connected；In PWM inverter bridge, S1Emitter stage and S2Current collection
The most connected, S3Emitter stage and S4Colelctor electrode be connected, S5Emitter stage and S6Colelctor electrode be connected, by S2、S4、S6Colelctor electrode
Draw tri-outfans of a, b, c of PWM inverter bridge respectively；Tri-outfans of a, b, c of PWM inverter bridge are all connected to load.
The beneficial effects of the utility model are: 1, Boost circuit realizes maximal power tracing, and PWM inverter bridge realizes
DC/AC converts；Tap inductor quasi-Z source network part can be by the tap position of appropriate design tap inductor and control PWM inversion
Busbar voltage is risen to higher value by the straight-through time of bridge brachium pontis, enables PWM inverter bridge to export the alternating current of higher magnitude
Pressure；2, inheriting Z-source inverter utilizes the bridge arm direct pass time to realize the feature of boosting inverter, in no instance can be because of bridge
Arm is straight-through and causes input power short circuit, improves the reliability of system；There is not conventional inverter to draw owing to adding dead band
The problem playing output voltage waveforms distortion；3, reduce the size of electric capacity and reduce stress, being no longer required in passive network
Inductance capacitance high degree of symmetry, reduces the design difficulty of changer, and continuous input current, is more suitably applied to the new energy such as photovoltaic
The occasion of source generating.
Accompanying drawing explanation
Fig. 1 is this utility model structural representation.
Fig. 2 is this utility model tap inductor winding N1、N2Current waveform schematic diagram with bus；i1For winding N1Electricity
Stream, i2For winding N2Electric current, ibFor bus current.
Fig. 3 is this utility model shoot-through zero vector state equivalent circuit diagram；LkFor tap inductor LtLeakage inductance, LmFor tap
Inductance LtMagnetizing inductance, uLFor the voltage at inductance L two ends, ubFor busbar voltage, uC1、uC2It is respectively electric capacity C1、C2The electricity at two ends
Pressure, umFor magnetizing inductance LmThe voltage at two ends, u1For winding N1The voltage at two ends, u2For winding N2The voltage at two ends.
Fig. 4 and Fig. 5 is this utility model tradition zero vector state equivalent circuit diagram；Diode VD in Fig. 42Conducting, two
Pole pipe VD3Cut-off；Diode VD in Fig. 52Cut-off, diode VD3Conducting.
Fig. 6 is this utility model effective vector state equivalent circuit diagram.
Detailed description of the invention
Below in conjunction with Figure of description, the technical solution of the utility model is further elaborated, but is not limited to this.
As it is shown in figure 1, photovoltaic power generation system structure schematic diagram based on tap inductor quasi-Z source network, including photovoltaic array,
Boost circuit, tap inductor quasi-Z source network, PWM inverter bridge, load；Photovoltaic array, Boost circuit, tap electricity
Feel quasi-Z source network, PWM inverter bridge, load be sequentially connected with, photovoltaic array output direct current energy be for conversion into AC energy, for
Load supplying；Boost circuit includes photovoltaic side storage capacitor C0, Boost boost inductance L0, Boost circuit derailing switch
Part S0, Boost circuit diode VD0, DC side storage capacitor Cd；Tap inductor quasi-Z source network includes inductance L, diode
VD1~ VD3, electric capacity C1And C2, tap inductor Lt, tap lead is by tap inductor LtIt is divided into inductance L1With inductance L2Two parts, inductance
L1Umber of turn be N1, inductance L2Umber of turn be N2；PWM inverter bridge uses three-phase full-bridge inverter structure, including six
Switching device S1~S6And the anti-paralleled diode of each of which, switching device S1、S3、S5Colelctor electrode be connected as PWM inversion
The input anode of bridge, switching device S2、S4、S6Emitter stage be connected as the input negative terminal of PWM inverter bridge；Photovoltaic array and light
Volt side storage capacitor C0It is connected in parallel, photovoltaic array output cathode and Boost boost inductance L0It is connected, Boost boost inductance L0Separately
One end and Boost circuit switching device S0Colelctor electrode, Boost circuit diode VD0Anode be connected, Boost liter
Volt circuit diode VD0Negative electrode and DC side storage capacitor CdOne end, inductance L one end be connected, the other end of inductance L with
Diode VD1Anode, electric capacity C2One end be connected, diode VD1Negative electrode and electric capacity C1One end, tap inductor LtInput
End is connected, tap inductor LtOutfan and diode VD3Anode be connected, tap inductor LtTap lead and diode VD2
Anode be connected, diode VD2Negative electrode and diode VD3Negative electrode, electric capacity C2The other end, the input anode of PWM inverter bridge
It is connected, electric capacity C1The other end and photovoltaic array output negative pole, Boost circuit switching device S0Emitter stage, DC side storage
Can electric capacity CdThe other end, PWM inverter bridge input negative terminal be connected；In PWM inverter bridge, S1Emitter stage and S2Colelctor electrode phase
Even, S3Emitter stage and S4Colelctor electrode be connected, S5Emitter stage and S6Colelctor electrode be connected, by S2、S4、S6Colelctor electrode respectively
Draw tri-outfans of a, b, c of PWM inverter bridge；Tri-outfans of a, b, c of PWM inverter bridge are all connected to load.
To simplify the analysis, hypothesis below is done: 1, device is ideal operation state；2, photovoltaic array, Boost circuit
It is equivalent to a direct voltage source E.Leading directly to and under non-pass-through state, respectively by winding N1With winding N1+N2Work.Due to coupling
Closing coefficient k reality is not 1, introduces leakage inductance L in circuit analysisk, magnetizing inductance LmExpression formula be:
(I),
Leakage inductance LkExpression formula be:
(II).
Set turn ratio N=N2/N1, then the inductance value of two windings of tap inductor can be expressed as:
(III).
Assume electric capacity C1、C2Capacitance relatively big, then in a switch periods, capacitance voltage can be considered constant.One switch
In cycle, tap inductor quasi-Z source network may operate in 3 kinds of on off states, including shoot-through zero vector state, tradition zero vector shape
State and effective vector state.Wherein tradition zero vector state can be divided into again two sub-states.
Tap inductor winding N1、N2With the current waveform schematic diagram of bus as shown in Figure 2.
1, operation mode 1(t0～t1): Fig. 3 show this utility model shoot-through zero vector state equivalent circuit diagram, bus electricity
Pressure ubVia the short circuit of PWM inverter bridge.During this period, electric capacity C1Voltage is added in winding N1On.Winding N1Electric current is from minima I1(0) Open
Beginning linear increase.Work as t=t1Time, i1Reach maximum.Tap inductor winding N2Induced potential be left "+" right "-", diode VD3
Cut-off.Meanwhile, input voltage E and electric capacity C2Voltage Series is added on inductance L by straight-through brachium pontis, inductance L electric current iLFrom minimum
Value IL(0)Linear increase.Work as t=t1Time, iLAlso maximum is reached.Additionally, due to uC1＞-uC2, diode VD1Cut-off.
2, operation mode 2(t1～t2): Fig. 4 and Fig. 5 is this utility model tradition zero vector state equivalent circuit diagram, PWM
Inverter bridge is opened a way.t1Moment, winding N1And N2Electromotive force declines rapidly, and arrives reverse maximum.During this period of time, leakage
The existence of inductance energy, winding N1Electric current passes through electric capacity C2Continue circulation, be now added in L1On voltage be uC2, i1Under the most linear
Fall.Afterwards due to u2＞ u1(N ＞ 1), diode VD2Current over-zero ends, diode VD3Conducting, as shown in Figure 5.Winding N1、N2
Series connection is to electric capacity C2Charging, uC2=u1+u2, tap inductor LtElectric current linear decline, and i1=i2.Now, winding N it is added in1Upper voltage
For uC2-u2。
3, operation mode 3(t2～t3): Fig. 6 show this utility model effective vector state equivalent circuit diagram, now PWM
Inverter bridge is equivalent to a current source.Winding N2With winding N1Series connection powering load, continues to electric capacity C simultaneously2Voltage, i1
Continue linear decline.
In operation mode 2 and operation mode 3, inductance L with E connects to electric capacity C1Charging, the voltage being added on L is uC1-
E, inductance L electric current iLLinear reduction.Work as t=t3 Time, iLMinimize value.
Claims (1)
1. photovoltaic generating system based on tap inductor quasi-Z source network, it is characterised in that tap inductor quasi-Z source network includes electricity
Sense L, diode VD1～VD3, electric capacity C1And C2, tap inductor Lt, tap lead is by tap inductor LtIt is divided into inductance L1With inductance L2
Two parts, inductance L1Umber of turn be N1, inductance L2Umber of turn be N2；PWM inverter bridge uses three-phase full-bridge inverter knot
Structure, including six switching device S1～S6And the anti-paralleled diode of each of which, switching device S1、S3、S5Colelctor electrode phase
Continuous cropping is the input anode of PWM inverter bridge, switching device S2、S4、S6Emitter stage be connected as the input negative terminal of PWM inverter bridge；
Photovoltaic array and photovoltaic side storage capacitor C0It is connected in parallel, photovoltaic array output cathode and Boost boost inductance L0It is connected, Boost
Boost inductance L0The other end and Boost circuit switching device S0Colelctor electrode, Boost circuit diode VD0Anode
It is connected, Boost circuit diode VD0Negative electrode and DC side storage capacitor CdOne end, inductance L one end be connected, inductance
The other end of L and diode VD1Anode, electric capacity C2One end be connected, diode VD1Negative electrode and electric capacity C1One end, tap
Inductance LtInput be connected, tap inductor LtOutfan and diode VD3Anode be connected, tap inductor LtTap draw
Line and diode VD2Anode be connected, diode VD2Negative electrode and diode VD3Negative electrode, electric capacity C2The other end, PWM inverse
The input anode becoming bridge is connected, electric capacity C1The other end and photovoltaic array output negative pole, Boost circuit switching device S0's
Emitter stage, DC side storage capacitor CdThe other end, PWM inverter bridge input negative terminal be connected；In PWM inverter bridge, S1Emitter stage
With S2Colelctor electrode be connected, S3Emitter stage and S4Colelctor electrode be connected, S5Emitter stage and S6Colelctor electrode be connected, by S2、S4、
S6Colelctor electrode draw tri-outfans of a, b, c of PWM inverter bridge respectively；Tri-outfans of a, b, c of PWM inverter bridge are all connected to
Load.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620130425.9U CN205595803U (en) | 2016-02-21 | 2016-02-21 | Photovoltaic power generation system based on accurate Z source network of inductance of taking a percentage |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620130425.9U CN205595803U (en) | 2016-02-21 | 2016-02-21 | Photovoltaic power generation system based on accurate Z source network of inductance of taking a percentage |
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| Publication Number | Publication Date |
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| CN205595803U true CN205595803U (en) | 2016-09-21 |
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| CN201620130425.9U Expired - Fee Related CN205595803U (en) | 2016-02-21 | 2016-02-21 | Photovoltaic power generation system based on accurate Z source network of inductance of taking a percentage |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109256811A (en) * | 2018-11-16 | 2019-01-22 | 上海海事大学 | A kind of shaft generator system peculiar to vessel and its control method |
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2016
- 2016-02-21 CN CN201620130425.9U patent/CN205595803U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109256811A (en) * | 2018-11-16 | 2019-01-22 | 上海海事大学 | A kind of shaft generator system peculiar to vessel and its control method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160921 Termination date: 20170221 |