CN102163852B - Neutral point clamped non-isolated photovoltaic grid-connected inverter - Google Patents
Neutral point clamped non-isolated photovoltaic grid-connected inverter Download PDFInfo
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- CN102163852B CN102163852B CN201110061521.4A CN201110061521A CN102163852B CN 102163852 B CN102163852 B CN 102163852B CN 201110061521 A CN201110061521 A CN 201110061521A CN 102163852 B CN102163852 B CN 102163852B
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- power switch
- switch pipe
- potential drop
- dividing potential
- filter inductance
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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
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without 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
- H02M7/537—Conversion of dc power input into ac power output without 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, e.g. single switched pulse inverters
- H02M7/5387—Conversion of dc power input into ac power output without 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, e.g. single switched pulse inverters in a bridge configuration
- H02M7/5388—Conversion of dc power input into ac power output without 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, e.g. single switched pulse inverters in a bridge configuration with asymmetrical configuration of switches
-
- 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
- H02M1/00—Details of apparatus for conversion
- H02M1/12—Arrangements for reducing harmonics from ac input or output
- H02M1/123—Suppression of common mode voltage or current
-
- 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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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
The invention discloses a neutral point clamped non-isolated photovoltaic grid-connected inverter, belonging to the field of power electronic converters. The inverter is constituted by an input divided capacitor branch, a neutral point clamped branch, a full-bridge switch unit and a network accessing filter branch. The inverter is characterized in that two switching tubes and an input divided capacitor are added to form a neutral point clamped branch on the basis of a basic full-bridge circuit, so that the potential of a follow current return circuit is half of a battery voltage at a follow current stage, thus eliminating leakage current of the non-isolated grid-connected inverter. Relative to the topology of an existing non-isolated photovoltaic grid-connected inverter, the inverter provided by the invention has the advantages that the maximum voltage stress of parts of power switching tubes and the voltage regulation factors of all power switching tubes are half of that of the battery voltage; electromagnetic interference and switching loss are reduced; and the inverter is applied to transformer-free isolated photovoltaic grid-connected occasions.
Description
Technical field
The present invention relates to a kind of neutral point clamp non-isolated grid-connected inverter, belong to converters technical field, relate in particular to parallel network power generation.
Background technology
The absolute predominance such as non-isolated photovoltaic grid-connected inverter has that efficiency is high, volume is little, lightweight and cost is low.But due to the photovoltaic battery panel existence of parasitic capacitance over the ground, while making the switch motion of combining inverter switching device to produce high frequency, time variant voltage acts on parasitic capacitance, and consequent leakage current may exceed allowed band.The generation of high-frequency leakage current also can bring conduction and radiated interference, the humorous increase that involves loss of grid current, the safety that even jeopardizes equipment and personnel.
The differential mode characteristic good of the full-bridge grid-connected inverter of Unipolar SPWM, as high in input direct voltage utilance and filter inductance current pulsation amount is little etc. is subject to extensive concern.But produced the common-mode voltage (its amplitude is input direct voltage) of switching frequency pulsation simultaneously, make need to add in grid-connected application scenario transformer isolation (low frequency or high frequency), but the common-mode voltage of dither constitutes a threat to the dielectric strength of transformer, further increased cost of manufacture.The full-bridge grid-connected powder inverter common-mode voltage substantially constant of bipolar SPWM, equals 1/2nd of photovoltaic cell input voltage all the time, can produce common mode leakage current hardly.Yet compare with Unipolar SPWM, bipolar SPWM exists obviously not enough: switching loss and ac filter inductor loss are all twices of Unipolar SPWM, have affected the efficiency of system.Therefore, one of object of research non-isolated grid-connected inverter is exactly how to form new continuous current circuit, makes converter have the premium properties of low-leakage current and high conversion efficiency simultaneously.
Patent EP 1369985A2 proposes between the brachium pontis mid point of full-bridge circuit (AC) and adds the new continuous current circuit of two-way gate-controlled switch set constructor; Patent US 7411802B2 only introduces a HF switch at photovoltaic cell side anode, can realize equally afterflow stage solar cell end and electrical network and depart from.But according to full-bridge circuit high frequency common mode equivalent model, the high frequency common mode voltage producing in order to eliminate Unipolar SPWM modulation, must make the continuous current circuit current potential in afterflow stage be clamped at half of photovoltaic cell input voltage, so just can make common-mode voltage eliminate completely, and not simply make photovoltaic battery panel and electrical network depart from.Document " Ma Lin; golden new people. transless structure photovoltaic parallel in system common mode leakage current is analyzed; solar energy journal; 2009; vol.30 (7): Page (s): 883-888. " a kind of non-isolated grid-connected inverter topology with DC channel proposed, by increasing by two switching tubes, two diodes and two dividing potential drop electric capacity, make the continuous current circuit current potential in afterflow stage be clamped at half of photovoltaic cell input voltage, but its current path is all the time through four switching devices, therefore conversion efficiency is lower.
Summary of the invention
Goal of the invention: technical problem to be solved by this invention is the deficiency for above-mentioned background technology, provides a kind of neutral point clamp non-isolated grid-connected inverter.
The present invention adopts following technical scheme for achieving the above object:
A kind of neutral point clamp non-isolated grid-connected inverter, its input is connected with solar cell, output is connected with electrical network, and described neutral point clamp non-isolated grid-connected inverter comprises input dividing potential drop capacitive branch, neutral point clamp branch road, full-bridge switch unit and network access filter branches; Wherein inputting dividing potential drop capacitive branch, neutral point clamp branch road, full-bridge switch unit, network access filter branches connects successively;
Input dividing potential drop capacitive branch comprises by the first dividing potential drop electric capacity, the second dividing potential drop electric capacity;
Neutral point clamp branch road comprises the 7th power switch pipe, the 8th power switch pipe;
Full-bridge switch unit comprises the first power switch pipe, the second power switch pipe, the 3rd power switch pipe, the 4th power switch pipe, the 5th power switch pipe, the 6th power switch pipe;
Network access filter branches comprises the first filter inductance, the second filter inductance, filter capacitor;
The anode of the first dividing potential drop electric capacity connects respectively the drain electrode of solar cell positive output end, the first power switch pipe, the drain electrode of the 4th power switch pipe, the negative terminal of the first dividing potential drop electric capacity connects respectively the anode of the second dividing potential drop electric capacity, the collector electrode of the emitter of the 7th power switch pipe, the 8th power switch pipe, and the negative terminal of the second dividing potential drop electric capacity connects respectively the source electrode of solar cell negative output terminal, the 3rd power switch pipe, the source electrode of the 6th power switch pipe; The source electrode of the first power switch pipe connects respectively the collector electrode of the second power switch pipe, the collector electrode of the 7th power switch pipe; The emitter of the second power switch pipe connects respectively the drain electrode of the 3rd power switch pipe, one end of the first filter inductance; The source electrode of the 4th power switch pipe connects respectively the collector electrode of the 5th power switch pipe, one end of the second filter inductance; The emitter of the 5th power switch pipe connects respectively the drain electrode of the 6th power switch pipe, the emitter of the 8th power switch pipe; The other end of the first filter inductance connects respectively one end of filter capacitor, one end of electrical network, and the other end of the second filter inductance connects respectively the other end of filter capacitor, the other end of electrical network.
A kind of neutral point clamp non-isolated grid-connected inverter, its input is connected with solar cell, output is connected with electrical network, and described neutral point clamp non-isolated grid-connected inverter comprises input dividing potential drop capacitive branch, neutral point clamp branch road, full-bridge switch unit and network access filter branches; Wherein inputting dividing potential drop capacitive branch, neutral point clamp branch road, full-bridge switch unit, network access filter branches connects successively;
Input dividing potential drop capacitive branch comprises by the first dividing potential drop electric capacity, the second dividing potential drop electric capacity;
Neutral point clamp branch road comprises the 7th power switch pipe, the 8th power switch pipe;
Full-bridge switch unit comprises the first power switch pipe, the second power switch pipe, the 3rd power switch pipe, the 4th power switch pipe, the 5th power switch pipe, the 6th power switch pipe;
Network access filter branches comprises the first filter inductance, the second filter inductance, filter capacitor;
The anode of the first dividing potential drop electric capacity connects respectively the drain electrode of solar cell positive output end, the 3rd power switch pipe, the drain electrode of the 6th power switch pipe, the negative terminal of the first dividing potential drop electric capacity connects respectively the anode of the second dividing potential drop electric capacity, the collector electrode of the emitter of the 8th power switch pipe, the 7th power switch pipe, and the negative terminal of the second dividing potential drop electric capacity connects respectively the source electrode of solar cell negative output terminal, the first power switch pipe, the source electrode of the 4th power switch pipe; The drain electrode of the first power switch pipe connects respectively the emitter of the second power switch pipe, the emitter of the 7th power switch pipe; The collector electrode of the second power switch pipe connects respectively the source electrode of the 3rd power switch pipe, one end of the first filter inductance; The drain electrode of the 4th power switch pipe connects respectively the emitter of the 5th power switch pipe, one end of the second filter inductance; The collector electrode of the 5th power switch pipe connects respectively the source electrode of the 6th power switch pipe, the collector electrode of the 8th power switch pipe; The other end of the first filter inductance connects respectively one end of filter capacitor, one end of electrical network, and the other end of the second filter inductance connects respectively the other end of filter capacitor, the other end of electrical network.
A kind of neutral point clamp non-isolated grid-connected inverter, its input is connected with solar cell, output is connected with electrical network, and described neutral point clamp non-isolated grid-connected inverter comprises input dividing potential drop capacitive branch, neutral point clamp branch road, full-bridge switch unit and network access filter branches; Wherein inputting dividing potential drop capacitive branch, neutral point clamp branch road, full-bridge switch unit, network access filter branches connects successively;
Input dividing potential drop capacitive branch comprises by the first dividing potential drop electric capacity, the second dividing potential drop electric capacity;
Neutral point clamp branch road comprises the 7th power switch pipe, the 8th power switch pipe;
Full-bridge switch unit comprises the first power switch pipe, the second power switch pipe, the 3rd power switch pipe, the 4th power switch pipe, the 5th power switch pipe, the 6th power switch pipe;
Network access filter branches comprises the first filter inductance, the second filter inductance, filter capacitor;
The anode of the first dividing potential drop electric capacity connects respectively the drain electrode of solar cell positive output end, the 3rd power switch pipe, the drain electrode of the 6th power switch pipe, the negative terminal of the first dividing potential drop electric capacity connects respectively the anode of the second dividing potential drop electric capacity, the emitter of the emitter of the 7th power switch pipe, the 8th power switch pipe, and the negative terminal of the second dividing potential drop electric capacity connects respectively the source electrode of the first power switch pipe, the source electrode of the 4th power switch pipe; The drain electrode of the first power switch pipe connects respectively the emitter of the second power switch pipe, one end of the first filter inductance; The collector electrode of the second power switch pipe connects respectively the source electrode of the 3rd power switch pipe, the collector electrode of the 8th power switch pipe; The drain electrode of the 4th power switch pipe connects respectively the emitter of the 5th power switch pipe, one end of the second filter inductance; The collector electrode of the 5th power switch pipe connects respectively the source electrode of the 6th power switch pipe, the collector electrode of the 7th power switch pipe; The other end of the first filter inductance connects respectively one end of filter capacitor, one end of electrical network, and the other end of the second filter inductance connects respectively the other end of filter capacitor, the other end of electrical network.
A kind of neutral point clamp non-isolated grid-connected inverter, its input is connected with solar cell, output is connected with electrical network, and described neutral point clamp non-isolated grid-connected inverter comprises input dividing potential drop capacitive branch, neutral point clamp branch road, full-bridge switch unit and network access filter branches; Wherein inputting dividing potential drop capacitive branch, neutral point clamp branch road, full-bridge switch unit, network access filter branches connects successively;
Input dividing potential drop capacitive branch comprises by the first dividing potential drop electric capacity, the second dividing potential drop electric capacity;
Neutral point clamp branch road comprises the 7th power switch pipe, the 8th power switch pipe;
Full-bridge switch unit comprises the first power switch pipe, the second power switch pipe, the 3rd power switch pipe, the 4th power switch pipe, the 5th power switch pipe, the 6th power switch pipe;
Network access filter branches comprises the first filter inductance, the second filter inductance, filter capacitor;
The anode of the first dividing potential drop electric capacity connects respectively the drain electrode of solar cell positive output end, the 3rd power switch pipe, the drain electrode of the 6th power switch pipe, the negative terminal of the first dividing potential drop electric capacity connects respectively the collector electrode of the 7th power switch pipe, the anode of the collector electrode of the 8th power switch pipe, the second dividing potential drop electric capacity, and the negative terminal of the second dividing potential drop electric capacity connects respectively the source electrode of the first power switch pipe, the source electrode of the 4th power switch pipe; The drain electrode of the first power switch pipe connects respectively the emitter of the second power switch pipe, the emitter of the 7th power switch pipe; The collector electrode of the second power switch pipe connects respectively the source electrode of the 3rd power switch pipe, one end of the first filter inductance; The drain electrode of the 4th power switch pipe connects respectively the collector electrode of the 5th power switch pipe, the emitter of the 8th power switch pipe; The collector electrode of the 5th power switch pipe connects respectively the source electrode of the 6th power switch pipe, one end of the second filter inductance; The other end of the first filter inductance connects respectively one end of filter capacitor, one end of electrical network, and the other end of the second filter inductance connects respectively the other end of filter capacitor, the other end of electrical network.
Feature of the present invention and technique effect:
(1) on the basis of full-bridge circuit, add two power switch pipes and dividing potential drop electric capacity to form clamp branch road, realize afterflow during the stage, continuous current circuit current potential is half of photovoltaic cell voltage, thereby eliminates the leakage current of non-isolated grid-connected inverter;
(2) wherein the maximum voltage stress of six power switch pipes be cell voltage half, can select the power switch pipe of low on-resistance, be conducive to the further raising of efficiency;
(3) synchronization only has the action of two power switch pipe high frequencies, and the voltage change ratio of all power switch pipes is cell voltage half, has reduced switching loss and electromagnetic interference;
Accompanying drawing explanation
Fig. 1 is neutral point clamp non-isolated grid-connected inverter circuit topology embodiment mono-of the present invention;
Fig. 2 is neutral point clamp non-isolated grid-connected inverter circuit topology embodiment bis-of the present invention;
Fig. 3 is neutral point clamp non-isolated grid-connected inverter circuit topology embodiment tri-of the present invention;
Fig. 4 is neutral point clamp non-isolated grid-connected inverter circuit topology embodiment tetra-of the present invention;
Fig. 5 is the drive principle waveform of neutral point clamp non-isolated grid-connected inverter embodiment mono-of the present invention;
Fig. 6 is each switch mode equivalent circuit diagram of neutral point clamp non-isolated grid-connected inverter embodiment mono-of the present invention.
Symbol description in figure:
U
pV-photovoltaic cell voltage, 1-dividing potential drop capacitive branch, 2-clamp branch road, 3-full-bridge switch unit, 4-network access filter branches, v
g-electrical network, C
dc1, C
dc2-first, second dividing potential drop electric capacity, S
1～S
8the-the first～eight power switch pipe, L
1, L
2-first, second filter inductance, C
o-filter capacitor, v
e-modulation signal, v
st-triangular carrier signal, v
gs1～v
gs8the driving voltage of the-the first～eight power switch pipe, the t-time.
Embodiment
For technological means, creation characteristic that the present invention is realized, reach target and effect is easy to understand, below in conjunction with concrete diagram, further set forth the present invention.
Input dividing potential drop capacitive branch 1 comprises by the first dividing potential drop capacitor C
dc1, the second dividing potential drop capacitor C
dc2;
Neutral point clamp branch road 2 comprises the 7th power switch tube S
7, the 8th power switch tube S
8;
Full-bridge switch unit 3 comprises the first power switch tube S
1, the second power switch tube S
2, the 3rd power switch tube S
3, the 4th power switch tube S
4, the 5th power switch tube S
5, the 6th power switch tube S
6;
Network access filter branches 4 comprises the first filter inductance L
1, the second filter inductance L
2, filter capacitor C
o;
The first dividing potential drop capacitor C
dc1anode connect respectively solar cell positive output end, the first power switch tube S
1drain electrode, the 4th power switch tube S
4drain electrode, the first dividing potential drop capacitor C
dc1negative terminal connect respectively the second dividing potential drop capacitor C
dc2anode, the 7th power switch tube S
7emitter, the 8th power switch tube S
8collector electrode, the second dividing potential drop capacitor C
dc2negative terminal connect respectively solar cell negative output terminal, the 3rd power switch tube S
3source electrode, the 6th power switch tube S
6source electrode; The first power switch tube S
1source electrode connect respectively the second power switch tube S
2collector electrode, the 7th power switch tube S
7collector electrode; The second power switch tube S
2emitter connect respectively the 3rd power switch tube S
3drain electrode, the first filter inductance L
1one end; The 4th power switch tube S
4source electrode connect respectively the 5th power switch tube S
5collector electrode, the second filter inductance L
2one end; The 5th power switch tube S
5emitter connect respectively the 6th power switch tube S
6drain electrode, the 8th power switch tube S
8emitter; The first filter inductance L
1the other end connect respectively filter capacitor C
oone end, electrical network v
gone end, the second filter inductance L
2the other end connect respectively filter capacitor C
othe other end, electrical network v
gthe other end.
Accompanying drawing 4 is neutral point clamp non-isolated grid-connected inverter circuit topology embodiment tetra-, and its electric circuit constitute is with attached embodiment illustrated in fig. 1 one identical, but circuit connecting relation is: the first dividing potential drop capacitor C
dc1anode connect respectively solar cell positive output end, the 3rd power switch tube S
3drain electrode, the 6th power switch tube S
6drain electrode, the first dividing potential drop capacitor C
dc1negative terminal connect respectively the 7th power switch tube S
7collector electrode, the 8th power switch tube S
8collector electrode, the second dividing potential drop capacitor C
dc2anode, the second dividing potential drop capacitor C
dc2negative terminal connect respectively the first power switch tube S
1source electrode, the 4th power switch tube S
4source electrode; The first power switch tube S
1drain electrode connect respectively the second power switch tube S
2emitter, the 7th power switch tube S
7emitter; The second power switch tube S
2collector electrode connect respectively the 3rd power switch tube S
3source electrode, the first filter inductance L
1one end; The 4th power switch tube S
4drain electrode connect respectively the 5th power switch tube S
5collector electrode, the 8th power switch tube S
8emitter; The 5th power switch tube S
5collector electrode connect respectively the 6th power switch tube S
6source electrode, the second filter inductance L
2one end; The first filter inductance L
1the other end connect respectively filter capacitor C
oone end, electrical network v
gone end, the second filter inductance L
2the other end connect respectively filter capacitor C
othe other end, electrical network v
gthe other end.
Control principle and the course of work:
Below in conjunction with accompanying drawing 5 and 6 explanation neutral point clamp non-isolated grid-connected inverter of the present invention modulation principle and the course of work in the specific implementation.
Accompanying drawing 6 is each switch mode equivalent circuit diagrams of neutral point clamp non-isolated grid-connected inverter circuit topology embodiment mono-.
Mode 1: equivalent electric circuit as shown in Fig. 4 (a), first, second, the 5th and the 6th power switch tube S
1, S
2, S
4, S
6conducting, other power switch pipe turn-offs, and grid current flows through the first power switch tube S successively
1, the second power switch tube S
2, the first filter inductance L
1, electrical network v
g, the second filter inductance L
2, the 5th power switch tube S
5, the 6th power switch tube S
6;
Mode 2: equivalent electric circuit as shown in Fig. 4 (b), the second, the 5th, the 7th, the 8th power switch tube S
2, S
5, S
7, S
8conducting, other power switch pipe turn-offs, by the second, the 5th power switch tube S
2, S
5with the 7th, the 8th power switch tube S
7, S
8body diode form continuous current circuit, and by first, second dividing potential drop capacitor C
dc1, C
dc2in the continuous current circuit current potential of naming a person for a particular job be clamped at cell voltage U
pVhalf;
Mode 3: equivalent electric circuit as shown in Fig. 4 (c), the 3rd, the 4th, the 7th and the 8th power switch tube S
3, S
4, S
7, S
8conducting, other power switch pipe turn-offs; Seven, the 8th power switch tube S
7, S
8although conducting, due to the blocking effect of its body diode, does not have electric current to flow through, grid current flows through the 4th power switch tube S successively
4, the second filter inductance L
2, electrical network v
g, the first filter inductance L
1, the 3rd power switch tube S
3;
Mode 4: equivalent electric circuit as shown in Fig. 4 (d), the second, the 5th, the 7th, the 8th power switch tube S
2, S
5, S
7, S
8conducting, other power switch pipe turn-offs, by the second, the 5th power switch tube S
2, S
5body diode and the 7th, the 8th power switch tube S
7, S
8form continuous current circuit, and by first, second dividing potential drop capacitor C
dc1, C
dc2in the continuous current circuit current potential of naming a person for a particular job be clamped at cell voltage U
pVhalf;
Visible, regardless of the direction of grid current, in the afterflow stage, continuous current circuit current potential is clamped at cell voltage U all the time
pVhalf.
Claims (2)
1. a neutral point clamp non-isolated grid-connected inverter, is characterized in that: dividing potential drop capacitive branch (1), clamp branch road (2), full-bridge switch unit (3) and network access filter branches (4), consist of; Dividing potential drop capacitive branch (1) is by the first dividing potential drop electric capacity (C
dc1), the second dividing potential drop electric capacity (C
dc2) form; Clamp branch road (2) is by the 7th power switch pipe (S
7), the 8th power switch pipe (S
8) form; Full-bridge switch unit comprises the first to the 6th power switch pipe (S
1～S
6) form; Network access filter branches (4) is by the first filter inductance (L
1), the second filter inductance (L
2) and filter capacitor (C
o) form; Its operation principle has four kinds of operation modes, and continuous current circuit current potential is clamped at cell voltage (U all the time
pV) half;
Wherein, the first dividing potential drop electric capacity (C
dc1) anode connect respectively solar cell positive output end, the first power switch pipe (S
1) drain electrode, the 4th power switch pipe (S
4) drain electrode, the first dividing potential drop electric capacity (C
dc1) negative terminal connect respectively the second dividing potential drop electric capacity (C
dc2) anode, the 7th power switch pipe (S
7) emitter, the 8th power switch pipe (S
8) collector electrode, the second dividing potential drop electric capacity (C
dc2) negative terminal connect respectively solar cell negative output terminal, the 3rd power switch pipe (S
3) source electrode, the 6th power switch pipe (S
6) source electrode; The first power switch pipe (S
1) source electrode connect respectively the second power switch pipe (S
2) collector electrode, the 7th power switch pipe (S
7) collector electrode; The second power switch pipe (S
2) emitter connect respectively the 3rd power switch pipe (S
3) drain electrode, the first filter inductance (L
1) one end; The 4th power switch pipe (S
4) source electrode connect respectively the 5th power switch pipe (S
5) collector electrode, the second filter inductance (L
2) one end; The 5th power switch pipe (S
5) emitter connect respectively the 6th power switch pipe (S
6) drain electrode, the 8th power switch pipe (S
8) emitter; The first filter inductance (L
1) the other end connect respectively filter capacitor (C
o) one end, electrical network (v
g) one end, the second filter inductance (L
2) the other end connect respectively filter capacitor (C
o) the other end, electrical network (v
g) the other end; Four kinds of operation modes are as follows: mode 1, first, second, the 5th and the 6th power switch pipe (S
1, S
2, S
5, S
6) conducting, other power switch pipe turn-offs, and grid current flows through the first power switch pipe (S successively
1), the second power switch pipe (S
2), the first filter inductance (L
1), electrical network (v
g), the second filter inductance (L
2), the 5th power switch pipe (S
5), the 6th power switch pipe (S
6); Mode 2, the second, the 5th, the 7th, the 8th power switch pipe (S
2, S
5, S
7, S
8) conducting, other power switch pipe turn-offs, by the second, the 5th power switch pipe (S
2, S
5) and the 7th, the 8th power switch pipe (S
7, S
8) body diode form continuous current circuit, and by first, second dividing potential drop electric capacity (C
dc1, C
dc2) in the continuous current circuit current potential of naming a person for a particular job be clamped at cell voltage (U
pV) half; Mode 3, the three, the 4th, the 7th and the 8th power switch pipe (S
3, S
4, S
7, S
8) conducting, other power switch pipe turn-offs; Seven, the 8th power switch pipe (S
7, S
8although) conducting, due to the blocking effect of its body diode, do not have electric current to flow through, grid current flows through the 4th power switch pipe (S successively
4), the second filter inductance (L
2), electrical network (v
g), the first filter inductance (L
1), the 3rd power switch pipe (S
3); Mode 4, the second, the 5th, the 7th, the 8th power switch pipe (S
2, S
5, S
7, S
8) conducting, other power switch pipe turn-offs, by the second, the 5th power switch pipe (S
2, S
5) body diode and the 7th, the 8th power switch pipe (S
7, S
8) form continuous current circuit, and by first, second dividing potential drop electric capacity (C
dc1, C
dc2) in the continuous current circuit current potential of naming a person for a particular job be clamped at cell voltage (U
pV) half.
2. neutral point clamp non-isolated grid-connected inverter according to claim 1, is characterized in that: described the first, the 3rd, the 4th, the 6th power switch pipe (S
1, S
3, S
4, S
6) be mos field effect transistor, the second, the 5th, the 7th, the 8th power switch pipe (S
2, S
5, S
7, S
8) be insulated gate bipolar transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110061521.4A CN102163852B (en) | 2011-03-15 | 2011-03-15 | Neutral point clamped non-isolated photovoltaic grid-connected inverter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110061521.4A CN102163852B (en) | 2011-03-15 | 2011-03-15 | Neutral point clamped non-isolated photovoltaic grid-connected inverter |
Publications (2)
| Publication Number | Publication Date |
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| CN102163852A CN102163852A (en) | 2011-08-24 |
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Families Citing this family (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102361408A (en) * | 2011-10-20 | 2012-02-22 | 东南大学 | Non-isolated photovoltaic grid-connected inverter and switching control time sequence thereof |
| CN102427303A (en) * | 2011-12-29 | 2012-04-25 | 阳光电源股份有限公司 | Single-phase inverter |
| CN102624268B (en) * | 2012-03-27 | 2014-07-16 | 阳光电源股份有限公司 | Inverter and application circuit in three-phase system |
| CN103701355B (en) * | 2013-12-18 | 2016-04-20 | 南京航空航天大学 | The control system of neutral point clamp type tri-level half-bridge inverter and pressure equalizing control method |
| CN104300822A (en) * | 2014-09-26 | 2015-01-21 | 南京邮电大学 | Method for controlling single-phase non-isolated photovoltaic inverter with follow current clamping switch |
| CN104967350A (en) * | 2015-07-20 | 2015-10-07 | 安徽大学 | High-efficiency H7-type single-phase non-isolated grid-connected inverter |
| CN105186914A (en) * | 2015-08-14 | 2015-12-23 | 安徽大学 | Novel H6 single-phase non-isolation grid-connected inverter |
| CN105281361B (en) * | 2015-09-25 | 2017-09-05 | 河海大学 | A kind of five-level double step-down combining inverter |
| CN105186912B (en) * | 2015-09-28 | 2017-12-19 | 河海大学 | A kind of non-isolated full-bridge grid-connected inverter of two-stage type |
| CN105262361B (en) * | 2015-09-28 | 2017-11-14 | 河海大学 | A kind of two-stage type non-isolated grid-connected inverter and its control method |
| CN108347191B (en) * | 2018-03-15 | 2020-02-28 | 国网上海市电力公司 | Non-isolated single-phase photovoltaic grid-connected inversion topological structure |
| CN108712098B (en) * | 2018-08-02 | 2024-02-09 | 宝雨控股有限公司 | Three-level inverter for static reactive compensation device and inverter circuit structure thereof |
| CN108964502A (en) * | 2018-09-30 | 2018-12-07 | 华南理工大学 | A kind of single-phase non-isolated active clamp MOSFET inverter |
| CN110649831B (en) * | 2019-05-10 | 2021-04-13 | 阳光电源股份有限公司 | Shutdown wave-sealing control method of multi-level inverter circuit and application device thereof |
| EP4000351A4 (en) * | 2019-08-15 | 2023-03-29 | Tridonic GmbH & Co KG | Driver module and lighting system suitable for use in a humid environment |
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