CN202424566U - Single-phase unfenced photovoltaic grid-connected inverted circuit - Google Patents
Single-phase unfenced photovoltaic grid-connected inverted circuit Download PDFInfo
- Publication number
- CN202424566U CN202424566U CN 201220033194 CN201220033194U CN202424566U CN 202424566 U CN202424566 U CN 202424566U CN 201220033194 CN201220033194 CN 201220033194 CN 201220033194 U CN201220033194 U CN 201220033194U CN 202424566 U CN202424566 U CN 202424566U
- Authority
- CN
- China
- Prior art keywords
- diode
- switch
- anode
- power
- igbt switch
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Classifications
-
- 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
Landscapes
- Inverter Devices (AREA)
Abstract
The utility model discloses a single-phase unfenced photovoltaic grid-connected inverted circuit comprising a photovoltaic array PV, a counter charge resisting power diode and two direct current bus filter capacitors, and further comprising six power switches and a single-phase grid, wherein the six power switches form two bridge arms, and two voltage clamping power diodes are correspondingly arranged between the two bridge arms and the two direct current filter capacitors. When the single-phase unfenced photovoltaic grid-connected inverted circuit disclosed by the utility model is used for inhibiting the size of a common mode current, the circuit conversion efficiency can be improved.
Description
Technical field
The utility model belongs to the solar photovoltaic technology field, is specifically related to a kind of single-phase non-isolated grid-connected power-generation inversion circuit.
Background technology
Generally, the area of photovoltaic array is very big, under the environment of humidity photovoltaic array over the ground parasitic capacitance can reach 200nF/kWp.The switch motion of combining inverter power device possibly produce the voltage that high frequency changes; Because the photovoltaic array existence of parasitic capacitance over the ground; Thereby cause producing common mode current on the parasitic capacitance over the ground; The generation of this high-frequency leakage current can bring conduction and radiated interference, the humorous increase that involves loss of grid-connected current, even causes equipment and personal safety.
The utility model content
The purpose of the utility model provides a kind of single-phase non-isolated grid-connected power-generation inversion circuit, in the size that suppresses common mode current, can improve circuit conversion efficient.
The technical scheme that the utility model adopted is; A kind of single-phase non-isolated grid-connected power-generation inversion circuit; It is characterized in that; Comprise photovoltaic array PV, single-phase electrical network and six power switchs, six power switchs are respectively an IGBT switch S 1, the 2nd IGBT switch S 2, the 3rd IGBT switch S 3, the 4th IGBT switch S 4, the 5th IGBT switch S 5 and the 6th IGBT switch S 6;
Photovoltaic array PV is anodal to be connected with the first diode D1 anode; Photovoltaic array PV negative pole is connected with the negative electrode of the second dc bus filter capacitor C2, the emitter of the 5th IGBT switch S 5 and the emitter of the 6th IGBT switch S 6; The first diode D1 negative electrode is connected with the anode of the first dc bus filter capacitor C1, the collector electrode of an IGBT switch S 1 and the collector electrode of the 2nd IGBT switch S 2, and the negative electrode of the first dc bus filter capacitor C1 is connected with the anode of the second dc bus filter capacitor C2, the anode of the second diode D2 and the anode of the 3rd diode D3;
The negative electrode of the negative electrode of the collector electrode of the emitter of the one IGBT switch S 1, the 3rd IGBT switch S 3, the second diode D2 and the 4th diode D4 is connected, and an end of the collector electrode of the emitter of the 3rd IGBT switch S 3, the 5th IGBT switch S 5, the anode of the 5th diode D5 and the first ac filter inductance L 1 is connected; The negative electrode of the collector electrode of the emitter of the 2nd IGBT switch S 2, the 4th IGBT switch S 4, the 3rd diode D3 and the 5th diode D5 negative electrode be connected; One end of the anode of the collector electrode of the emitter of the 4th IGBT switch S 4, the 6th IGBT switch S 6, the 4th diode D4 and the second ac filter inductance L 2 is connected, corresponding respectively live wire and the zero line that is connected single-phase electrical network of the other end of the first ac filter inductance L 1 and the second ac filter inductance L 2;
Wherein, the first diode D1 is that power diode is filled in counnter attack, and the second diode D2 and the 3rd diode D3 are the voltage clamp power diode, and the 4th diode D4 and the 5th diode D5 are the continuous current circuit power diode.
The first dc bus filter capacitor C1 is identical with the second dc bus filter capacitor C2.
Another technical scheme that the utility model adopted is; A kind of single-phase non-isolated grid-connected power-generation inversion circuit; It is characterized in that; Comprise photovoltaic array PV, single-phase electrical network and six power switchs, said six power switchs are respectively the first switch mosfet S1, the second switch mosfet S2, the 3rd switch mosfet S3, the 4th switch mosfet S4, the 5th switch mosfet S5 and the 6th switch mosfet S6;
Photovoltaic array PV is anodal to be connected with the first diode D1 anode; Photovoltaic array PV negative pole is connected with the negative electrode of the second dc bus filter capacitor C2, the source electrode of the 5th switch mosfet S5 and the source electrode of the 6th switch mosfet S6; The first diode D1 negative electrode is connected with the anode of the first dc bus filter capacitor C1, the drain electrode of the first switch mosfet S1 and the drain electrode of the second switch mosfet S2, and the negative electrode of the first dc bus filter capacitor C1 is connected with the anode of the second dc bus filter capacitor C2, the anode of the second diode D2 and the anode of the 3rd diode D3;
The negative electrode of the negative electrode of the drain electrode of the source electrode of the first switch mosfet S1, the 3rd switch mosfet S3, the second diode D2 and the 4th diode D4 is connected, and an end of the drain electrode of the source electrode of the 3rd switch mosfet S3, the 5th switch mosfet S5, the anode of the 5th diode D5 and the first ac filter inductance L 1 is connected; The negative electrode of the drain electrode of the source electrode of the second switch mosfet S2, the 4th switch mosfet S4, the 3rd diode D3 and the 5th diode D5 negative electrode be connected; One end of the anode of the drain electrode of the source electrode of the 4th switch mosfet S4, the 6th switch mosfet S6, the 4th diode D4 and the second ac filter inductance L 2 is connected, corresponding respectively live wire and the zero line that is connected single-phase electrical network of the other end of the first ac filter inductance L 1 and the second ac filter inductance L 2;
Wherein, the first diode D1 is that power diode is filled in counnter attack, and the second diode D2 and the 3rd diode D3 are the voltage clamp power diode, and the 4th diode D4 and the 5th diode D5 are the continuous current circuit power diode.
The first dc bus filter capacitor C1 is identical with the second dc bus filter capacitor C2.
The advantage of the single-phase non-isolated grid-connected power-generation inversion circuit of the utility model is: a kind of low-loss, transformerless inverter circuit are provided; The output of this circuit full bridge inverter between the afterflow period is clamped at the half the of DC bus-bar voltage by clamping diode; Thereby can between the photovoltaic array both positive and negative polarity, not produce High-frequency Interference, reach the purpose of effective inhibition common mode current size.
Description of drawings
Fig. 1 is the circuit connection diagram of the single-phase non-isolated grid-connected power-generation inversion circuit of the utility model;
When Fig. 2 is the utility model work, the current circuit figure the when photovoltaic array between the line voltage positive half period feeds electric energy into electrical network;
When Fig. 3 is the utility model work, electric current continuous current circuit between the line voltage positive half period and voltage clamp loop diagram;
When Fig. 4 is the utility model work, the current circuit figure the when photovoltaic array between the line voltage negative half-cycle feeds electric energy into electrical network;
When Fig. 5 is the utility model work, electric current continuous current circuit between the line voltage negative half-cycle and voltage clamp loop diagram.
Embodiment
As shown in Figure 1; The single-phase non-isolated grid-connected power-generation inversion circuit of the utility model; Comprise photovoltaic array PV, single-phase electrical network 1 and six power switchs, six power switchs are respectively an IGBT switch S 1, the 2nd IGBT switch S 2, the 3rd IGBT switch S 3, the 4th IGBT switch S 4, the 5th IGBT switch S 5 and the 6th IGBT switch S 6.
Photovoltaic array PV is anodal to be connected with the first diode D1 anode; Photovoltaic array PV negative pole is connected with the negative electrode of the second dc bus filter capacitor C2, the emitter of the 5th IGBT switch S 5 and the emitter of the 6th IGBT switch S 6; Remember that this tie point is node N; The first diode D1 negative electrode is connected with the anode of the first dc bus filter capacitor C1, the collector electrode of an IGBT switch S 1 and the collector electrode of the 2nd IGBT switch S 2, and the negative electrode of the first dc bus filter capacitor C1 is connected with the anode of the second dc bus filter capacitor C2, the anode of the second diode D2 and the anode of the 3rd diode D3.
The negative electrode of the negative electrode of the collector electrode of the emitter of the one IGBT switch S 1, the 3rd IGBT switch S 3, the second diode D2 and the 4th diode D4 is connected; One end of the anode of the collector electrode of the emitter of the 3rd IGBT switch S 3, the 5th IGBT switch S 5, the 5th diode D5 and the first ac filter inductance L 1 is connected, and remembers that this tie point is node A; The negative electrode of the collector electrode of the emitter of the 2nd IGBT switch S 2, the 4th IGBT switch S 4, the 3rd diode D3 and the 5th diode D5 negative electrode be connected; One end of the anode of the collector electrode of the emitter of the 4th IGBT switch S 4, the 6th IGBT switch S 6, the 4th diode D4 and the second ac filter inductance L 2 is connected; Remember that this tie point is a Node B, corresponding respectively live wire and the zero line that is connected single-phase electrical network 1 of the other end of the first ac filter inductance L 1 and the second ac filter inductance L 2.
Wherein, the first diode D1 is that power diode is filled in counnter attack, and the second diode D2 and the 3rd diode D3 are the voltage clamp power diode, and the 4th diode D4 and the 5th diode D5 are the continuous current circuit power diode.The first dc bus filter capacitor C1 is identical with the second dc bus filter capacitor C2, and generally according to the design of system rated power, for example corresponding C1 and C2 is 1000uF/300V during rated power 1kW.
To shown in Figure 5, the operation principle of the utility model is like Fig. 2:
1) during the positive half cycle of line voltage; The 3rd IGBT switch S 3 conducting always; The 2nd IGBT switch S 2, the 4th IGBT switch S 4 and the 5th IGBT switch S 5 are turn-offed always, and an IGBT switch S 1 and the 6th IGBT switch S 6 are opened and turn-offed with pulse width modulation (PWM) mode simultaneously.
When an IGBT switch S 1 and the 6th IGBT switch S 6 are opened simultaneously; Current circuit is as shown in Figure 2, and the electric energy that photovoltaic array produces is presented to single-phase electrical network 1 through the first diode D1, an IGBT switch S 1, the 3rd IGBT switch S 3 and the 6th IGBT switch S 6 and the first ac filter inductance L 1 and the second ac filter inductance L 2.Voltage equals DC bus-bar voltage between node A and node N at this moment; Voltage equals 0 between Node B and node N; Because common-mode voltage equals between node A and node N the half the of voltage sum between voltage and Node B and node N, so this moment, common-mode voltage equaled half of DC bus-bar voltage.
When an IGBT switch S 1 and the 6th IGBT switch S 6 are turn-offed simultaneously; Electric current continuous current circuit and voltage clamp loop are as shown in Figure 3; Inverter output current carries out afterflow through the 3rd IGBT switch S 3, the first ac filter inductance L 1 and the second ac filter inductance L 2, the 4th diode D4; Second diode D2 conducting this moment, so the voltage of node A and Node B all is clamped at the half the of DC bus-bar voltage.So this moment, common-mode voltage also equaled the half the of DC bus-bar voltage.
It is thus clear that when the positive half cycle of line voltage, common-mode voltage is constant, equal the half the of DC bus-bar voltage.
2) during the line voltage negative half period, the 4th IGBT switch S 4 conducting always, an IGBT switch S 1, the 3rd IGBT switch S 3 and the 6th IGBT switch S 6 are turn-offed always, and the 2nd IGBT switch S 2 and the 5th IGBT switch S 5 are opened and are turn-offed with the PWM mode simultaneously.
When the 2nd IGBT switch S 2 and the 5th IGBT switch S 5 are opened simultaneously; Current circuit is as shown in Figure 4, and the electric energy that photovoltaic array produces is presented to single-phase electrical network 1 through the first diode D1, the 2nd IGBT switch S 2, the 4th IGBT switch S 4 and the 5th IGBT switch S 5 and the first ac filter inductance L 1 and the second ac filter inductance L 2.Voltage equals DC bus-bar voltage between Node B and node N at this moment, and voltage equals 0 between node A and node N, so this moment, common-mode voltage equaled the half the of DC bus-bar voltage.
When the 2nd IGBT switch S 2 and the 5th IGBT switch S 5 are turn-offed simultaneously; Electric current continuous current circuit and voltage clamp loop are as shown in Figure 5; Carry out afterflow through the 4th IGBT switch S 4, the first ac filter inductance L 1 and the second ac filter inductance L 2, the 5th diode D5; The 3rd diode D3 conducting this moment, so the voltage of Node B and node A is clamped at the half the of DC bus-bar voltage.
It is thus clear that when the line voltage negative half period, common-mode voltage also is constant, also equal the half the of DC bus-bar voltage.
A kind of single-phase non-isolated grid-connected power-generation inversion circuit of the utility model; Comprise photovoltaic array PV, single-phase electrical network 1 and six power switchs, six power switchs are respectively the first switch mosfet S1, the second switch mosfet S2, the 3rd switch mosfet S3, the 4th switch mosfet S4, the 5th switch mosfet S5 and the 6th switch mosfet S6.
Photovoltaic array PV is anodal to be connected with the first diode D1 anode; Photovoltaic array PV negative pole is connected with the negative electrode of the second dc bus filter capacitor C2, the source electrode of the 5th switch mosfet S5 and the source electrode of the 6th switch mosfet S6; The first diode D1 negative electrode is connected with the anode of the first dc bus filter capacitor C1, the drain electrode of the first switch mosfet S1 and the drain electrode of the second switch mosfet S2, and the negative electrode of the first dc bus filter capacitor C1 is connected with the anode of the second dc bus filter capacitor C2, the anode of the second diode D2 and the anode of the 3rd diode D3.
The negative electrode of the negative electrode of the drain electrode of the source electrode of the first switch mosfet S1, the 3rd switch mosfet S3, the second diode D2 and the 4th diode D4 is connected, and an end of the drain electrode of the source electrode of the 3rd switch mosfet S3, the 5th switch mosfet S5, the anode of the 5th diode D5 and the first ac filter inductance L 1 is connected; The negative electrode of the drain electrode of the source electrode of the second switch mosfet S2, the 4th switch mosfet S4, the 3rd diode D3 and the 5th diode D5 negative electrode be connected; One end of the anode of the drain electrode of the source electrode of the 4th switch mosfet S4, the 6th switch mosfet S6, the 4th diode D4 and the second ac filter inductance L 2 is connected, corresponding respectively live wire and the zero line that is connected single-phase electrical network 1 of the other end of the first ac filter inductance L 1 and the second ac filter inductance L 2.
Wherein, the first diode D1 is that power diode is filled in counnter attack, and the second diode D2 and the 3rd diode D3 are the voltage clamp power diode, and the 4th diode D4 and the 5th diode D5 are the continuous current circuit power diode.The first dc bus filter capacitor C1 is identical with the second dc bus filter capacitor C2, and generally according to the design of system rated power, for example corresponding C1 and C2 is 1000uF/300V during rated power 1kW.
Present embodiment and embodiment 1 difference are that power switch all uses the IGBT switch among the embodiment 1, and power switch all uses switch mosfet in the present embodiment.The operation principle of present embodiment is with embodiment 1.
In cycle, the inverter circuit of the utility model can not produce common mode current basically at whole electrical network.Simultaneously can find out that also the utility model has adopted the single-polarity PWM modulation system, both reduce switching loss and ac filter circuit loss, also help reducing the ac filter inductance value, reduce the circuit volume and weight, reduce cost.
Claims (4)
1. single-phase non-isolated grid-connected power-generation inversion circuit; It is characterized in that; Comprise photovoltaic array PV, single-phase electrical network (1) and six power switchs, said six power switchs are respectively an IGBT switch S 1, the 2nd IGBT switch S 2, the 3rd IGBT switch S 3, the 4th IGBT switch S 4, the 5th IGBT switch S 5 and the 6th IGBT switch S 6;
Said photovoltaic array PV is anodal to be connected with the first diode D1 anode; Photovoltaic array PV negative pole is connected with the negative electrode of the second dc bus filter capacitor C2, the emitter of the 5th IGBT switch S 5 and the emitter of the 6th IGBT switch S 6; The said first diode D1 negative electrode is connected with the anode of the first dc bus filter capacitor C1, the collector electrode of an IGBT switch S 1 and the collector electrode of the 2nd IGBT switch S 2, and the negative electrode of the said first dc bus filter capacitor C1 is connected with the anode of the second dc bus filter capacitor C2, the anode of the second diode D2 and the anode of the 3rd diode D3;
The negative electrode of the negative electrode of the collector electrode of the emitter of a said IGBT switch S 1, the 3rd IGBT switch S 3, the second diode D2 and the 4th diode D4 is connected, and an end of the collector electrode of the emitter of said the 3rd IGBT switch S 3, the 5th IGBT switch S 5, the anode of the 5th diode D5 and the first ac filter inductance L 1 is connected; The negative electrode of the collector electrode of the emitter of said the 2nd IGBT switch S 2, the 4th IGBT switch S 4, the 3rd diode D3 and the 5th diode D5 negative electrode be connected; One end of the anode of the collector electrode of the emitter of said the 4th IGBT switch S 4, the 6th IGBT switch S 6, the 4th diode D4 and the second ac filter inductance L 2 is connected, corresponding respectively live wire and the zero line that is connected single-phase electrical network (1) of the other end of the said first ac filter inductance L 1 and the second ac filter inductance L 2;
Wherein, the said first diode D1 is that power diode is filled in counnter attack, and the second diode D2 and the 3rd diode D3 are the voltage clamp power diode, and the 4th diode D4 and the 5th diode D5 are the continuous current circuit power diode.
2. according to the described single-phase non-isolated grid-connected power-generation inversion circuit of claim 1, it is characterized in that the said first dc bus filter capacitor C1 is identical with the second dc bus filter capacitor C2.
3. single-phase non-isolated grid-connected power-generation inversion circuit; It is characterized in that; Comprise photovoltaic array PV, single-phase electrical network (1) and six power switchs, said six power switchs are respectively the first switch mosfet S1, the second switch mosfet S2, the 3rd switch mosfet S3, the 4th switch mosfet S4, the 5th switch mosfet S5 and the 6th switch mosfet S6;
Said photovoltaic array PV is anodal to be connected with the first diode D1 anode; Photovoltaic array PV negative pole is connected with the negative electrode of the second dc bus filter capacitor C2, the source electrode of the 5th switch mosfet S5 and the source electrode of the 6th switch mosfet S6; The said first diode D1 negative electrode is connected with the anode of the first dc bus filter capacitor C1, the drain electrode of the first switch mosfet S1 and the drain electrode of the second switch mosfet S2, and the negative electrode of the said first dc bus filter capacitor C1 is connected with the anode of the second dc bus filter capacitor C2, the anode of the second diode D2 and the anode of the 3rd diode D3;
The negative electrode of the negative electrode of the drain electrode of the source electrode of the said first switch mosfet S1, the 3rd switch mosfet S3, the second diode D2 and the 4th diode D4 is connected, and an end of the drain electrode of the source electrode of said the 3rd switch mosfet S3, the 5th switch mosfet S5, the anode of the 5th diode D5 and the first ac filter inductance L 1 is connected; The negative electrode of the drain electrode of the source electrode of the said second switch mosfet S2, the 4th switch mosfet S4, the 3rd diode D3 and the 5th diode D5 negative electrode be connected; One end of the anode of the drain electrode of the source electrode of said the 4th switch mosfet S4, the 6th switch mosfet S6, the 4th diode D4 and the second ac filter inductance L 2 is connected, corresponding respectively live wire and the zero line that is connected single-phase electrical network (1) of the other end of the said first ac filter inductance L 1 and the second ac filter inductance L 2;
Wherein, the said first diode D1 is that power diode is filled in counnter attack, and the second diode D2 and the 3rd diode D3 are the voltage clamp power diode, and the 4th diode D4 and the 5th diode D5 are the continuous current circuit power diode.
4. according to the described single-phase non-isolated grid-connected power-generation inversion circuit of claim 3, it is characterized in that the said first dc bus filter capacitor C1 is identical with the second dc bus filter capacitor C2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220033194 CN202424566U (en) | 2012-02-02 | 2012-02-02 | Single-phase unfenced photovoltaic grid-connected inverted circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220033194 CN202424566U (en) | 2012-02-02 | 2012-02-02 | Single-phase unfenced photovoltaic grid-connected inverted circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202424566U true CN202424566U (en) | 2012-09-05 |
Family
ID=46749289
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220033194 Expired - Fee Related CN202424566U (en) | 2012-02-02 | 2012-02-02 | Single-phase unfenced photovoltaic grid-connected inverted circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202424566U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102916445A (en) * | 2012-10-24 | 2013-02-06 | 西安理工大学 | Single-phase grid-connected photovoltaic power generating device capable of inhibiting common mode current |
| CN103269174A (en) * | 2012-12-10 | 2013-08-28 | 江西南昌供电公司 | Single-phase photovoltaic grid-connected inverter with low common-mode voltage |
-
2012
- 2012-02-02 CN CN 201220033194 patent/CN202424566U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102916445A (en) * | 2012-10-24 | 2013-02-06 | 西安理工大学 | Single-phase grid-connected photovoltaic power generating device capable of inhibiting common mode current |
| CN102916445B (en) * | 2012-10-24 | 2014-12-10 | 西安理工大学 | Single-phase grid-connected photovoltaic power generating device capable of inhibiting common mode current |
| CN103269174A (en) * | 2012-12-10 | 2013-08-28 | 江西南昌供电公司 | Single-phase photovoltaic grid-connected inverter with low common-mode voltage |
| CN103269174B (en) * | 2012-12-10 | 2016-12-21 | 国网江西省电力公司南昌供电分公司 | A kind of single-phase photovoltaic grid-connected inverter of low common-mode voltage |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101980409A (en) | Grid-connected photovoltaic inverter | |
| CN103023362A (en) | Bridgeless inverter circuit and solar bridgeless inverter | |
| CN101667793B (en) | Grid-connected inverter | |
| CN201536328U (en) | grid-connected inverter | |
| CN202513843U (en) | Full-bridge grid-connected inverter | |
| CN106169885B (en) | A kind of switch of tandem type six multi-electrical level inverter | |
| CN103956927A (en) | Voltage-active-clamping non-transformer-type single-phase photovoltaic inverter | |
| CN102088252B (en) | Inverter without transformer realized by switched capacitor and applications of inverter | |
| CN104410310A (en) | Neutral point clamped H-bridge photovoltaic inverter and method for inhibiting common mode leakage current | |
| CN202495887U (en) | Inverter used in photovoltaic power generation | |
| CN102684530A (en) | Method for controlling transformerless inverter with reactive power compensation function | |
| CN105656077A (en) | Efficient low-leakage current seven-switch photovoltaic grid-connected inverter circuit and modulation method thereof | |
| CN204119150U (en) | A kind of photovoltaic generating system of high-efficiency and low-cost | |
| CN201515320U (en) | Grid-connected inverter | |
| CN104716680A (en) | Offline uninterruptible power supply with renewable energy and control method thereof | |
| CN103269174B (en) | A kind of single-phase photovoltaic grid-connected inverter of low common-mode voltage | |
| CN202424566U (en) | Single-phase unfenced photovoltaic grid-connected inverted circuit | |
| CN205304268U (en) | Crisscross parallelly connected type photovoltaic grid -connected inverter | |
| CN102231606A (en) | Transformerless gird-connected inverter circuit | |
| Datta et al. | Ground leakage current elimination in a transformerless unipolar modulation based single phase grid-connected photovoltaic system | |
| CN203301393U (en) | Non transformer single-phase grid connected inverter | |
| CN202957614U (en) | High-efficiency transformer-free single-phase photovoltaic grid-connected inverter | |
| CN202385026U (en) | Miniature photovoltaic inverter | |
| CN201994870U (en) | Non-transformer inverter achieved by switch capacitor | |
| CN108988675A (en) | A kind of single-phase non-isolated MOSFET gird-connected inverter |
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 |
Granted publication date: 20120905 Termination date: 20150202 |
|
| EXPY | Termination of patent right or utility model |