CN206743122U - One kind three switchs three port flyback grid-connected photovoltaic inverters - Google Patents
One kind three switchs three port flyback grid-connected photovoltaic inverters Download PDFInfo
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- CN206743122U CN206743122U CN201621274047.8U CN201621274047U CN206743122U CN 206743122 U CN206743122 U CN 206743122U CN 201621274047 U CN201621274047 U CN 201621274047U CN 206743122 U CN206743122 U CN 206743122U
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- transformer
- diode pumped
- switch pipe
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- power diode
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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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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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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- Dc-Dc Converters (AREA)
Abstract
One kind three switchs three port flyback grid-connected photovoltaic inverters, including photovoltaic array module, coupling transformer and power network, the positive pole of photovoltaic array module connect simultaneously one end of the first filter capacitor, buffer electric capacity positive pole and first switch pipe drain electrode, the negative pole of photovoltaic array module is connected to the negative electrode of the other end of the first filter capacitor, the positive pole of decoupling capacitance and the first Power Diode Pumped；The source electrode of first switch pipe and one end of transformer leakage inductance are connected, and the other end of transformer leakage inductance is connected with the Same Name of Ends of one end of static exciter inductance, transformer primary side winding；The different name end of vice-side winding is connected with the anode of the first Power Diode Pumped；The utility model provides one kind three and switchs three port flyback grid-connected photovoltaic inverters, and the switching tube and Power Diode Pumped quantity that the inverter uses are few, and can realize the Sofe Switch of switching tube, and primary side current of transformer ripple is small, system high conversion efficiency.
Description
Technical field
Photovoltaic parallel in system field is the utility model is related to, three port inverse-excitation type photovoltaics are switched simultaneously more particularly to one kind three
Net inverter.
Background technology
Photovoltaic inverter system can substantially be summarized as concentrated inverter, group string inverter and Miniature inverter, in recent years,
The extensive concern that Miniature inverter receives expert and factory is primarily due to it and had the advantage that：Improve energy utilization rate and
System whole efficiency, reduce installation cost, strengthen flexibility, can plug and play operation.
In order to provide MPPT maximum power point tracking, the performance of inverter is improved, and sinusoidal current is injected to power network, it is proposed that work(
Rate decouples loop, including is decoupled back using the reactive power decoupling loop of passive device and using the active power of semiconductor switch
Road.Reactive power decoupling loop needs big energy storage device, most typically power capacitor, at present generally use capacitance it is big,
The low electrochemical capacitor of cost come realize photovoltaic parallel in system input instantaneous power and it is grid-connected output instantaneous power balance.However,
According to Arrhenius equation, when temperature often increases by 10 degree, the life-span of electrochemical capacitor will halve, and seriously limit inverter
Life-span.Therefore, adding active power decoupling unit in circuit, electrochemical capacitor is replaced with the thin-film capacitor of long-life.
The content of the invention
For the above-mentioned technological deficiency present in prior art, the utility model provides one kind three and switchs three port flybacks
Formula photovoltaic combining inverter, the switching tube and Power Diode Pumped quantity that the inverter uses are few, and can realize that the soft of switching tube opens
Close, primary side current of transformer ripple is small, system high conversion efficiency.
In order to solve the above technical problems, technical scheme is used by the utility model：One kind three switchs three port flybacks
Formula photovoltaic combining inverter, it is characterised in that：Including photovoltaic array module, coupling transformer and power network, photovoltaic array module
Positive pole simultaneously connect the first filter capacitor one end, buffer electric capacity positive pole and first switch pipe drain electrode, photovoltaic array module
Negative pole be connected to the negative electrode of the other end of the first filter capacitor, the positive pole of decoupling capacitance and the first Power Diode Pumped；First opens
One end of the source electrode and transformer leakage inductance that close pipe connects, the other end of transformer leakage inductance and one end of static exciter inductance, change
The Same Name of Ends connection of depressor primary side winding；The different name end of vice-side winding is connected with the anode of the first Power Diode Pumped；
The different name end of first vice-side winding of coupling transformer is simultaneously of the same name with the second vice-side winding of coupling transformer
End, one end connection of one end of filter inductance and the second filter capacitor, the Same Name of Ends of the first vice-side winding of coupling transformer with
The negative electrode connection of second Power Diode Pumped, the anode of the second Power Diode Pumped are connected with the source electrode of second switch pipe；Second switch
The drain electrode of pipe is connected with the source electrode, the other end of the second filter capacitor and the negative pole of power network of the 3rd switching tube；3rd switching tube
Drain electrode is connected with the negative electrode of the 3rd Power Diode Pumped；The anode of 3rd Power Diode Pumped and the second vice-side winding of coupling transformer
Different name end connection；The other end of filter inductance and the positive pole of power network connect.
Preferably, the first switch pipe, second switch pipe, the 3rd switching tube use the NMOS tube containing body diode.
Preferably, the decoupling capacitance uses thin-film capacitor.
Work as PPV＞ PoutWhen, decoupling circuit works in charge mode, by the unnecessary energy stores that photovoltaic cell is sent to solution
In coupling electric capacity, reach input side and outlet side power-balance.
Work as PPV＜ PoutWhen, decoupling circuit works in discharge mode, and the energy stored in decoupling capacitance is discharged, with
The deficiency of power grid energy is made up, reaches input side and outlet side power-balance.
The utility model provides one kind three and switchs three port flyback grid-connected photovoltaic inverters, using long-life, low capacitance
Thin-film capacitor substitution electrochemical capacitor so that inverter matches with photovoltaic array module service life；Decoupling capacitance is used as
Power decoupled, while reduce power attenuation for absorbing transformer leakage inductance energy as buffer circuit, improve overall effect
Rate.Meanwhile the circuit structure of the utility model use can realize the Sofe Switch of switching tube, switching tube loss is reduced.
Brief description of the drawings
The utility model is described in further detail with reference to the accompanying drawings and examples：
Fig. 1 is electrical block diagram of the present utility model.
Fig. 2 is the current flow diagrams of first stage when the utility model line voltage is positive half period.
Fig. 3 is the current flow diagrams of second stage when the utility model line voltage is positive half period.
Fig. 4 is the current flow diagrams of phase III when the utility model line voltage is positive half period.
Fig. 5 is the current flow diagrams of fourth stage when the utility model line voltage is positive half period.
Fig. 6 is the current flow diagrams in the 5th stage when the utility model line voltage is positive half period.
Fig. 7 is the current flow diagrams of first stage when the utility model line voltage is negative half-cycle.
Fig. 8 is the current flow diagrams of second stage when the utility model line voltage is negative half-cycle.
Fig. 9 is the current flow diagrams of phase III when the utility model line voltage is negative half-cycle.
Figure 10 is the current flow diagrams of fourth stage when the utility model line voltage is negative half-cycle.
Figure 11 is the current flow diagrams in the 5th stage when the utility model line voltage is negative half-cycle.
Embodiment
Mentality of designing of the present utility model：Within certain time and temperature range, the power of photovoltaic cell output is certain
Value：
PPV=VPVIPV
VPVFor photovoltaic cell output voltage, IPVFor photovoltaic cell output current.
When inverter is run with unity power factor, voltage and the current in phase position of power network are injected into, if：
ω is grid side angular frequency.
Then inverter output instantaneous power is：
In the case of loss-free, inverter output power direct current component is equal with inverter input power, i.e. PPV=
Pout, then the AC portion in power output is that decoupling loop needs power to be processed：
PPD(t)=Poutcos2ωt
It is decoupling elements to select electric capacity, works as PPV＞ PoutWhen, unnecessary a part of power is stored in decoupling capacitance, works as PPV
＜ PoutWhen, a part of power discharge in decoupling capacitance is stored in supplement required power.
As shown in figure 1, one kind three switchs three port flyback grid-connected photovoltaic inverters, it is characterised in that：Including photovoltaic battle array
Row module Vpv, coupling transformer and power network, photovoltaic array module Vpv positive pole connect the one of the first filter capacitor Cpv simultaneously
Hold, the drain electrode of buffering electric capacity Cs1 positive pole and first switch pipe S1, photovoltaic array module Vpv negative pole is connected to the first filtering
The negative electrode of the electric capacity Cpv other end, decoupling capacitance C1 positive pole and the first Power Diode Pumped D1；First switch pipe S1 source electrode with
Transformer leakage inductance Ll one end connection, the transformer leakage inductance Ll other end and static exciter inductance Lm one end, transformer primary
Side winding n1 Same Name of Ends connection；Vice-side winding n2 different name end is connected with the first Power Diode Pumped D1 anode；
First vice-side winding n3 of coupling transformer different name end is simultaneously with the second vice-side winding n4's of coupling transformer
One end connection of Same Name of Ends, filter inductance Lf one end and the second filter capacitor Cf, the first vice-side winding n3 of coupling transformer
Same Name of Ends be connected with the second Power Diode Pumped D2 negative electrode, the second Power Diode Pumped D2 anode and second switch pipe S2 source
Pole connects；Second switch pipe S2 drain electrode and the 3rd switching tube S3 source electrode, the second filter capacitor Cf other end and power network
Negative pole connects；3rd switching tube S3 drain electrode is connected with the 3rd Power Diode Pumped D3 negative electrode；3rd Power Diode Pumped D3 sun
Second vice-side winding n4 of pole and coupling transformer different name end connection；The filter inductance Lf other end and the positive pole of power network connect
Connect.
Preferably, the first switch pipe S1, second switch pipe S2, the 3rd switching tube S3 are used containing body diode
NMOS tube.
Preferably, the decoupling capacitance C1 uses thin-film capacitor.
As shown in Fig. 2 first stage, first switch pipe S1 and second switch pipe S2 conductings.Due to before this stage, delaying
Rush electric capacity Cs1 and static exciter inductance Lm and work in resonant condition, first switch pipe S1 both end voltages are zero, therefore are no-voltage
Start.Now, although second switch pipe S2 is turned on, the second Power Diode Pumped D2 reversely ends, therefore starts for zero current.This rank
Voltage in photovoltaic cell and decoupling capacitance C1 is mainly added on magnetizing inductance and leakage inductance by section.
As shown in figure 3, second stage, first switch pipe S1 shut-offs, second switch pipe S2 conductings.Electric capacity Cs1 is buffered to form
Continuous current circuit, transformer leakage inducing current gradually decrease to zero, because magnetizing inductance Lm is much larger than leakage inductance Ll, magnetizing inductance Lm
It can be approximately considered constant.Now, the energy stored in inverter magnetizing inductance passes to outlet side.
As shown in figure 4, phase III, first switch pipe S1 shut-offs, second switch pipe S2 conductings.Transformer primary side storage
Energy is transferred to power network by second switch pipe S2, second voltage diode D2.
As shown in figure 5, fourth stage, first switch pipe S1, second switch pipe S2 are turned off.In static exciter inductance Lm
Energy by decouple loop discharge, now, decoupling capacitance C1 charging.Meanwhile the electricity in the second filter capacitor of outlet side Cf
It is discharged into grid side.
As shown in fig. 6, the 5th stage, first switch pipe S1, second switch pipe S2 are turned off.Now, the energy in transformer
Amount is all discharged into decoupling capacitance by decoupling loop, buffering electric capacity Cs1, static exciter inductance Lm, transformer leakage
Feel Ll and form resonant tank.
The working condition that line voltage is operated in negative half-cycle is similar with positive half period, and now the 3rd switching tube S3 is closed all the time
It is disconnected.
As shown in fig. 7, first stage, first switch pipe S1 and the 3rd switching tube S3 conductings.Due to before this stage, delaying
Rush electric capacity Cs1 and static exciter inductance Lm and work in resonant condition, first switch pipe S1 both end voltages are zero, therefore are no-voltage
Start.Now, although the 3rd switching tube S3 is turned on, the 3rd Power Diode Pumped D3 reversely ends, therefore starts for zero current.This rank
Voltage in photovoltaic cell and decoupling capacitance C1 is mainly added on magnetizing inductance and leakage inductance by section.
As shown in figure 8, second stage, first switch pipe S1 shut-offs, the 3rd switching tube S3 conductings.Electric capacity Cs1 is buffered to form
Continuous current circuit, transformer leakage inducing current gradually decrease to zero, because magnetizing inductance Lm is much larger than leakage inductance Ll, magnetizing inductance Lm
It can be approximately considered constant, now, the energy stored in inverter magnetizing inductance passes to outlet side.
As shown in figure 9, phase III, first switch pipe S1 shut-offs, the 3rd switching tube S3 conductings.Transformer primary side storage
Energy is transferred to power network by the 3rd switching tube S3, tertiary voltage diode D3.
As shown in Figure 10, fourth stage, first switch pipe S1, the 3rd switching tube S3 are turned off.Static exciter inductance Lm
In energy by decouple loop discharge, now, decoupling capacitance C1 charging.Meanwhile the electricity in the second filter capacitor of outlet side Cf
Amount is discharged into grid side.
As shown in figure 11, the 5th stage, first switch pipe S1, the 3rd switching tube S3 are turned off.Now, the energy in transformer
Amount is all discharged into decoupling capacitance by decoupling loop, buffering electric capacity Cs1, static exciter inductance Lm, transformer leakage
Feel Ll and form resonant tank.
The above embodiments are only optimal technical scheme of the present utility model, and are not construed as limit of the present utility model
System, the technical scheme that the scope of protection of the utility model should be recorded with claim, including the technical scheme that claim is recorded
The equivalents of middle technical characteristic are protection domain.Equivalent substitution i.e. within this range is improved, also in the utility model
Protection domain within.
Claims (3)
1. one kind three switchs three port flyback grid-connected photovoltaic inverters, it is characterised in that：Including photovoltaic array module (Vpv),
Coupling transformer and power network, the positive pole of photovoltaic array module (Vpv) connect one end of the first filter capacitor (Cpv), buffering simultaneously
The drain electrode of the positive pole and first switch pipe (S1) of electric capacity (Cs1), the negative pole of photovoltaic array module (Vpv) are connected to the first filtered electrical
Hold the other end, the positive pole of decoupling capacitance (C1) and the negative electrode of the first Power Diode Pumped (D1) of (Cpv)；First switch pipe (S1)
Source electrode is connected with the one end of transformer leakage inductance (Ll), the other end of transformer leakage inductance (Ll) and the one of static exciter inductance (Lm)
End, the Same Name of Ends connection of transformer primary side winding (n1)；The different name end of vice-side winding (n2) and the first Power Diode Pumped (D1)
Anode connects；
The different name end of the first vice-side winding (n3) of coupling transformer simultaneously with the second vice-side winding (n4) of coupling transformer
One end connection of Same Name of Ends, one end of filter inductance (Lf) and the second filter capacitor (Cf), the first secondary of coupling transformer around
The Same Name of Ends of group (n3) is connected with the negative electrode of the second Power Diode Pumped (D2), and the anode of the second Power Diode Pumped (D2) is opened with second
Close the source electrode connection of pipe (S2)；The drain electrode of second switch pipe (S2) and source electrode, the second filter capacitor of the 3rd switching tube (S3)
(Cf) the negative pole connection of the other end and power network；The drain electrode of 3rd switching tube (S3) connects with the negative electrode of the 3rd Power Diode Pumped (D3)
Connect；The different name end of the anode of 3rd Power Diode Pumped (D3) and the second vice-side winding (n4) of coupling transformer connects；Filtered electrical
The positive pole of the other end and power network of feeling (Lf) connects.
2. one kind three switchs three port flyback grid-connected photovoltaic inverters according to claim 1, it is characterised in that：Described
One switching tube (S1), second switch pipe (S2), the 3rd switching tube (S3) use the NMOS tube containing body diode.
3. one kind three switchs three port flyback grid-connected photovoltaic inverters according to claim 1, it is characterised in that：The solution
Coupling electric capacity (C1) uses thin-film capacitor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621274047.8U CN206743122U (en) | 2016-11-24 | 2016-11-24 | One kind three switchs three port flyback grid-connected photovoltaic inverters |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621274047.8U CN206743122U (en) | 2016-11-24 | 2016-11-24 | One kind three switchs three port flyback grid-connected photovoltaic inverters |
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| Publication Number | Publication Date |
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| CN206743122U true CN206743122U (en) | 2017-12-12 |
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ID=60555103
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| Application Number | Title | Priority Date | Filing Date |
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| CN201621274047.8U Expired - Fee Related CN206743122U (en) | 2016-11-24 | 2016-11-24 | One kind three switchs three port flyback grid-connected photovoltaic inverters |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109842311A (en) * | 2019-01-21 | 2019-06-04 | 江苏大学 | A kind of grid-connected micro- inverter of three port inverse-excitation types and modulator approach with power decoupling circuit |
| CN110061523A (en) * | 2019-04-30 | 2019-07-26 | 武汉大学 | A kind of the Multifunctional single-phase grid-connected inverting system and method for novel topological structure |
| CN111510009A (en) * | 2020-05-20 | 2020-08-07 | 上海海事大学 | Photovoltaic inverter without leakage current and control method thereof |
| CN113765144A (en) * | 2021-09-18 | 2021-12-07 | 珠海格力电器股份有限公司 | Photovoltaic circuit, control method, device, equipment and storage medium thereof |
-
2016
- 2016-11-24 CN CN201621274047.8U patent/CN206743122U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109842311A (en) * | 2019-01-21 | 2019-06-04 | 江苏大学 | A kind of grid-connected micro- inverter of three port inverse-excitation types and modulator approach with power decoupling circuit |
| CN110061523A (en) * | 2019-04-30 | 2019-07-26 | 武汉大学 | A kind of the Multifunctional single-phase grid-connected inverting system and method for novel topological structure |
| CN110061523B (en) * | 2019-04-30 | 2022-11-29 | 武汉大学 | Multifunctional single-phase grid-connected inversion system and method with novel topological structure |
| CN111510009A (en) * | 2020-05-20 | 2020-08-07 | 上海海事大学 | Photovoltaic inverter without leakage current and control method thereof |
| CN111510009B (en) * | 2020-05-20 | 2021-07-30 | 上海海事大学 | Photovoltaic inverter without leakage current and control method thereof |
| CN113765144A (en) * | 2021-09-18 | 2021-12-07 | 珠海格力电器股份有限公司 | Photovoltaic circuit, control method, device, equipment and storage medium thereof |
| CN113765144B (en) * | 2021-09-18 | 2023-08-11 | 珠海格力电器股份有限公司 | Photovoltaic circuit, control method, device, equipment and storage medium thereof |
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| GR01 | Patent grant | ||
| 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: 20171212 Termination date: 20181124 |