CN102163852A - 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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- CN102163852A CN102163852A CN2011100615214A CN201110061521A CN102163852A CN 102163852 A CN102163852 A CN 102163852A CN 2011100615214 A CN2011100615214 A CN 2011100615214A CN 201110061521 A CN201110061521 A CN 201110061521A CN 102163852 A CN102163852 A CN 102163852A
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- power switch
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- potential drop
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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
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 the converters technical field, relate in particular to parallel network power generation.
Background technology
Absolute predominance such as the non-isolation type photovoltaic combining inverter has the efficient height, volume is little, in light weight and cost is low.But because the photovoltaic battery panel existence of parasitic capacitance over the ground, time variant voltage acts on the parasitic capacitance when making the switch motion of combining inverter switching device to produce high frequency, and consequent leakage current may exceed allowed band.The generation of high-frequency leakage current also can bring the increase of conduction and radiated interference, network access current harmonics and loss, even jeopardizes equipment and personnel's safety.
The differential mode characteristic good of the full-bridge grid-connected inverter of Unipolar SPWM, the high and filter inductance current pulsation amount extensive concern that is subjected to such as little as the input direct voltage utilance.But produced the common-mode voltage (its amplitude is an input direct voltage) of switching frequency pulsation simultaneously, make and to add transformer isolation (low frequency or high frequency) in grid-connected application scenario, but the common-mode voltage of dither constitutes a threat to the dielectric strength of transformer, has 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 the common mode leakage current hardly.Yet compare with Unipolar SPWM, bipolar SPWM exists obviously not enough: switching loss and ac filter inductor loss all are twices of Unipolar SPWM, have influenced the efficient of system.Therefore, one of purpose of research non-isolated grid-connected inverter is exactly how to constitute new continuous current circuit, makes converter have the premium properties of low-leakage current and high conversion efficiency simultaneously.
Patent EP 1369985A2 proposes the new continuous current circuit of (AC side) two-way gate-controlled switch set constructor of adding between the brachium pontis mid point of full-bridge circuit; Patent US 7411802B2 only introduces a HF switch at photovoltaic cell side anode, can realize that equally afterflow stage solar cell end and electrical network break away from.But according to full-bridge circuit high frequency common mode equivalent model, in order to eliminate the high frequency common mode voltage that the Unipolar SPWM modulation produces, must make the continuous current circuit current potential in afterflow stage be clamped at half of photovoltaic cell input voltage, common-mode voltage is eliminated fully, and be not that photovoltaic battery panel and electrical network are broken away 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 is 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, so conversion efficiency is lower.
Summary of the invention
Goal of the invention: technical problem to be solved by this invention is the deficiency at the above-mentioned background technology, and a kind of neutral point clamp non-isolated grid-connected inverter is provided.
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 importing 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;
The neutral point clamp branch road comprises the 7th power switch pipe, the 8th power switch pipe;
The full-bridge switch unit comprises first power switch pipe, second power switch pipe, the 3rd power switch pipe, the 4th power switch pipe, the 5th power switch pipe, the 6th power switch pipe;
The network access filter branches comprises first filter inductance, second filter inductance, filter capacitor;
The anode of the first dividing potential drop electric capacity connects the drain electrode of solar cell positive output end, first power switch pipe, the drain electrode of the 4th power switch pipe respectively, the negative terminal of the first dividing potential drop electric capacity connects the anode of the second dividing potential drop electric capacity, the emitter of the 7th power switch pipe, the collector electrode of the 8th power switch pipe respectively, and the negative terminal of the second dividing potential drop electric capacity connects the source electrode of solar cell negative output terminal, the 3rd power switch pipe, the source electrode of the 6th power switch pipe respectively; The source electrode of first power switch pipe connects the collector electrode of second power switch pipe, the collector electrode of the 7th power switch pipe respectively; The emitter of second power switch pipe connects the drain electrode of the 3rd power switch pipe, an end of first filter inductance respectively; The source electrode of the 4th power switch pipe connects the collector electrode of the 5th power switch pipe, an end of second filter inductance respectively; The emitter of the 5th power switch pipe connects the drain electrode of the 6th power switch pipe, the emitter of the 8th power switch pipe respectively; The other end of first filter inductance connects an end of filter capacitor, an end of electrical network respectively, and the other end of second filter inductance connects the other end of filter capacitor, the other end of electrical network respectively.
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 importing 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;
The neutral point clamp branch road comprises the 7th power switch pipe, the 8th power switch pipe;
The full-bridge switch unit comprises first power switch pipe, second power switch pipe, the 3rd power switch pipe, the 4th power switch pipe, the 5th power switch pipe, the 6th power switch pipe;
The network access filter branches comprises first filter inductance, second filter inductance, filter capacitor;
The anode of the first dividing potential drop electric capacity connects the drain electrode of solar cell positive output end, the 3rd power switch pipe, the drain electrode of the 6th power switch pipe respectively, the negative terminal of the first dividing potential drop electric capacity connects the anode of the second dividing potential drop electric capacity, the emitter of the 8th power switch pipe, the collector electrode of the 7th power switch pipe respectively, and the negative terminal of the second dividing potential drop electric capacity connects the source electrode of solar cell negative output terminal, first power switch pipe, the source electrode of the 4th power switch pipe respectively; The drain electrode of first power switch pipe connects the emitter of second power switch pipe, the emitter of the 7th power switch pipe respectively; The collector electrode of second power switch pipe connects the source electrode of the 3rd power switch pipe, an end of first filter inductance respectively; The drain electrode of the 4th power switch pipe connects the emitter of the 5th power switch pipe, an end of second filter inductance respectively; The collector electrode of the 5th power switch pipe connects the source electrode of the 6th power switch pipe, the collector electrode of the 8th power switch pipe respectively; The other end of first filter inductance connects an end of filter capacitor, an end of electrical network respectively, and the other end of second filter inductance connects the other end of filter capacitor, the other end of electrical network respectively.
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 importing 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;
The neutral point clamp branch road comprises the 7th power switch pipe, the 8th power switch pipe;
The full-bridge switch unit comprises first power switch pipe, second power switch pipe, the 3rd power switch pipe, the 4th power switch pipe, the 5th power switch pipe, the 6th power switch pipe;
The network access filter branches comprises first filter inductance, second filter inductance, filter capacitor;
The anode of the first dividing potential drop electric capacity connects the drain electrode of solar cell positive output end, the 3rd power switch pipe, the drain electrode of the 6th power switch pipe respectively, the negative terminal of the first dividing potential drop electric capacity connects the anode of the second dividing potential drop electric capacity, the emitter of the 7th power switch pipe, the emitter of the 8th power switch pipe respectively, and the negative terminal of the second dividing potential drop electric capacity connects the source electrode of first power switch pipe, the source electrode of the 4th power switch pipe respectively; The drain electrode of first power switch pipe connects the emitter of second power switch pipe, an end of first filter inductance respectively; The collector electrode of second power switch pipe connects the source electrode of the 3rd power switch pipe, the collector electrode of the 8th power switch pipe respectively; The drain electrode of the 4th power switch pipe connects the emitter of the 5th power switch pipe, an end of second filter inductance respectively; The collector electrode of the 5th power switch pipe connects the source electrode of the 6th power switch pipe, the collector electrode of the 7th power switch pipe respectively; The other end of first filter inductance connects an end of filter capacitor, an end of electrical network respectively, and the other end of second filter inductance connects the other end of filter capacitor, the other end of electrical network respectively.
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 importing 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;
The neutral point clamp branch road comprises the 7th power switch pipe, the 8th power switch pipe;
The full-bridge switch unit comprises first power switch pipe, second power switch pipe, the 3rd power switch pipe, the 4th power switch pipe, the 5th power switch pipe, the 6th power switch pipe;
The network access filter branches comprises first filter inductance, second filter inductance, filter capacitor;
The anode of the first dividing potential drop electric capacity connects the drain electrode of solar cell positive output end, the 3rd power switch pipe, the drain electrode of the 6th power switch pipe respectively, the negative terminal of the first dividing potential drop electric capacity connects the collector electrode of the 7th power switch pipe, the collector electrode of the 8th power switch pipe, the anode of the second dividing potential drop electric capacity respectively, and the negative terminal of the second dividing potential drop electric capacity connects the source electrode of first power switch pipe, the source electrode of the 4th power switch pipe respectively; The drain electrode of first power switch pipe connects the emitter of second power switch pipe, the emitter of the 7th power switch pipe respectively; The collector electrode of second power switch pipe connects the source electrode of the 3rd power switch pipe, an end of first filter inductance respectively; The drain electrode of the 4th power switch pipe connects the collector electrode of the 5th power switch pipe, the emitter of the 8th power switch pipe respectively; The collector electrode of the 5th power switch pipe connects the source electrode of the 6th power switch pipe, an end of second filter inductance respectively; The other end of first filter inductance connects an end of filter capacitor, an end of electrical network respectively, and the other end of second filter inductance connects the other end of filter capacitor, the other end of electrical network respectively.
Characteristics of the present invention and technique effect:
(1) add two power switch pipes and dividing potential drop electric capacity formation clamp branch road on the basis of full-bridge circuit, realize afterflow during the stage, the 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 is half of cell voltage, can select the power switch pipe of low on-resistance for use, helps the further raising of efficient;
(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;
Description of drawings
Fig. 1 is neutral point clamp non-isolated grid-connected inverter circuit topology embodiment one of the present invention;
Fig. 2 is neutral point clamp non-isolated grid-connected inverter circuit topology embodiment two of the present invention;
Fig. 3 is neutral point clamp non-isolated grid-connected inverter circuit topology embodiment three of the present invention;
Fig. 4 is neutral point clamp non-isolated grid-connected inverter circuit topology embodiment four of the present invention;
Fig. 5 is the drive principle waveform of neutral point clamp non-isolated grid-connected inverter embodiment one of the present invention;
Fig. 6 is each switch mode equivalent circuit diagram of neutral point clamp non-isolated grid-connected inverter embodiment one of the present invention.
Symbol description among the 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
8-the first～the 8th 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 first～the 8th 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 first power switch tube S
1, 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 solar cell positive output end, first power switch tube S respectively
1Drain electrode, the 4th power switch tube S
4Drain electrode, the first dividing potential drop capacitor C
Dc1Negative terminal connect the second dividing potential drop capacitor C respectively
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 solar cell negative output terminal, the 3rd power switch tube S respectively
3Source electrode, the 6th power switch tube S
6Source electrode; First power switch tube S
1Source electrode connect second power switch tube S respectively
2Collector electrode, the 7th power switch tube S
7Collector electrode; Second power switch tube S
2Emitter connect the 3rd power switch tube S respectively
3Drain electrode, the first filter inductance L
1An end; The 4th power switch tube S
4Source electrode connect the 5th power switch tube S respectively
5Collector electrode, the second filter inductance L
2An end; The 5th power switch tube S
5Emitter connect the 6th power switch tube S respectively
6Drain electrode, the 8th power switch tube S
8Emitter; The first filter inductance L
1The other end connect filter capacitor C respectively
oAn end, electrical network v
gAn end, the second filter inductance L
2The other end connect filter capacitor C respectively
oThe other end, electrical network v
gThe other end.
The control principle and the course of work:
Below in conjunction with the accompanying drawing 5 and the 6 explanation neutral point clamp non-isolated grid-connected inverters of the present invention modulation principle and the course of work in the specific implementation.
Accompanying drawing 5 is drive principle waveforms of neutral point clamp non-isolated grid-connected inverter circuit topology embodiment one, first power switch tube S
1With the 6th power switch tube S
6Drive signal is identical, and by the action of Unipolar SPWM mode high frequency, negative half period turn-offs at the positive half cycle of network access electric current; The 7th power switch tube S
7With the 8th power switch tube S
8Drive signal is identical, in the positive half cycle of network access electric current and first power switch tube S
1The drive signal complementation, and add Dead Time, negative half period is straight-through; The 3rd power switch tube S
3With the 4th power switch tube S
4Drive signal is identical, turn-offs at the positive half cycle of network access electric current, and negative half period is by the action of Unipolar SPWM mode high frequency; Second power switch tube S
2With the 5th power switch tube S
5Drive signal is identical, and is straight-through at the positive half cycle of network access electric current, negative half period and the 3rd power switch tube S
3The drive signal complementation, and add Dead Time; As modulation signal v
eGreater than triangular carrier signal v
StThe time, drive signal is a high level, otherwise is low level.
Accompanying drawing 6 is each switch mode equivalent circuit diagram of neutral point clamp non-isolated grid-connected inverter circuit topology embodiment one.
Mode 1: equivalent electric circuit 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 the network access electric current flows through first power switch tube S successively
1, 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 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 constitute 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 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
8Though conducting, because the blocking effect of its body diode does not have electric current to flow through, the network access electric 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 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
8Constitute 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;
As seen, regardless of the network access sense of current, in the afterflow stage, the continuous current circuit current potential is clamped at cell voltage U all the time
PVHalf.
Claims (4)
1. neutral point clamp non-isolated grid-connected inverter, its input is connected with solar cell, output is connected with electrical network, it is characterized in that: described neutral point clamp non-isolated grid-connected inverter comprises input dividing potential drop capacitive branch (1), neutral point clamp branch road (2), full-bridge switch unit (3) and network access filter branches (4); Wherein importing dividing potential drop capacitive branch (1), neutral point clamp branch road (2), full-bridge switch unit (3), network access filter branches (4) connects successively;
Input dividing potential drop capacitive branch (1) comprises by the first dividing potential drop electric capacity (C
Dc1), the second dividing potential drop electric capacity (C
Dc2);
Neutral point clamp branch road (2) comprises the 7th power switch pipe (S
7), the 8th power switch pipe (S
8);
Full-bridge switch unit (3) comprises the first power switch pipe (S
1), the second power switch pipe (S
2), the 3rd power switch pipe (S
3), the 4th power switch pipe (S
4), the 5th power switch pipe (S
5), the 6th power switch pipe (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 electric capacity (C
Dc1) anode connect solar cell positive output end, the first power switch pipe (S respectively
1) drain electrode, the 4th power switch pipe (S
4) drain electrode, the first dividing potential drop electric capacity (C
Dc1) negative terminal connect the second dividing potential drop electric capacity (C respectively
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 solar cell negative output terminal, the 3rd power switch pipe (S respectively
3) source electrode, the 6th power switch pipe (S
6) source electrode; First power switch pipe (the S
1) source electrode connect the second power switch pipe (S respectively
2) collector electrode, the 7th power switch pipe (S
7) collector electrode; Second power switch pipe (the S
2) emitter connect the 3rd power switch pipe (S respectively
3) drain electrode, the first filter inductance (L
1) an end; The 4th power switch pipe (S
4) source electrode connect the 5th power switch pipe (S respectively
5) collector electrode, the second filter inductance (L
2) an end; The 5th power switch pipe (S
5) emitter connect the 6th power switch pipe (S respectively
6) drain electrode, the 8th power switch pipe (S
8) emitter; First filter inductance (the L
1) the other end connect filter capacitor (C respectively
o) an end, electrical network (v
g) an end, the second filter inductance (L
2) the other end connect filter capacitor (C respectively
o) the other end, electrical network (v
g) the other end.
2. neutral point clamp non-isolated grid-connected inverter, its input is connected with solar cell, output is connected with electrical network, it is characterized in that: described neutral point clamp non-isolated grid-connected inverter comprises input dividing potential drop capacitive branch (1), neutral point clamp branch road (2), full-bridge switch unit (3) and network access filter branches (4); Wherein importing dividing potential drop capacitive branch (1), neutral point clamp branch road (2), full-bridge switch unit (3), network access filter branches (4) connects successively;
Input dividing potential drop capacitive branch (1) comprises by the first dividing potential drop electric capacity (C
Dc1), the second dividing potential drop electric capacity (C
Dc2);
Neutral point clamp branch road (2) comprises the 7th power switch pipe (S
7), the 8th power switch pipe (S
8);
Full-bridge switch unit (3) comprises the first power switch pipe (S
1), the second power switch pipe (S
2), the 3rd power switch pipe (S
3), the 4th power switch pipe (S
4), the 5th power switch pipe (S
5), the 6th power switch pipe (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 electric capacity (C
Dc1) anode connect solar cell positive output end, the 3rd power switch pipe (S respectively
3) drain electrode, the 6th power switch pipe (S
6) drain electrode, the first dividing potential drop electric capacity (C
Dc1) negative terminal connect the second dividing potential drop electric capacity (C respectively
Dc2) anode, the 8th power switch pipe (S
8) emitter, the 7th power switch pipe (S
7) collector electrode, the second dividing potential drop electric capacity (C
Dc2) negative terminal connect solar cell negative output terminal, the first power switch pipe (S respectively
1) source electrode, the 4th power switch pipe (S
4) source electrode; First power switch pipe (the S
1) drain electrode connect the second power switch pipe (S respectively
2) emitter, the 7th power switch pipe (S
7) emitter; Second power switch pipe (the S
2) collector electrode connect the 3rd power switch pipe (S respectively
3) source electrode, the first filter inductance (L
1) an end; The 4th power switch pipe (S
4) drain electrode connect the 5th power switch pipe (S respectively
5) emitter, the second filter inductance (L
2) an end; The 5th power switch pipe (S
5) collector electrode connect the 6th power switch pipe (S respectively
6) source electrode, the 8th power switch pipe (S
8) collector electrode; First filter inductance (the L
1) the other end connect filter capacitor (C respectively
o) an end, electrical network (v
g) an end, the second filter inductance (L
2) the other end connect filter capacitor (C respectively
o) the other end, electrical network (v
g) the other end.
3. neutral point clamp non-isolated grid-connected inverter, its input is connected with solar cell, output is connected with electrical network, it is characterized in that: described neutral point clamp non-isolated grid-connected inverter comprises input dividing potential drop capacitive branch (1), neutral point clamp branch road (2), full-bridge switch unit (3) and network access filter branches (4); Wherein importing dividing potential drop capacitive branch (1), neutral point clamp branch road (2), full-bridge switch unit (3), network access filter branches (4) connects successively;
Input dividing potential drop capacitive branch (1) comprises by the first dividing potential drop electric capacity (C
Dc1), the second dividing potential drop electric capacity (C
Dc2);
Neutral point clamp branch road (2) comprises the 7th power switch pipe (S
7), the 8th power switch pipe (S
8);
Full-bridge switch unit (3) comprises the first power switch pipe (S
1), the second power switch pipe (S
2), the 3rd power switch pipe (S
3), the 4th power switch pipe (S
4), the 5th power switch pipe (S
5), the 6th power switch pipe (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 electric capacity (C
Dc1) anode connect solar cell positive output end, the 3rd power switch pipe (S respectively
3) drain electrode, the 6th power switch pipe (S
6) drain electrode, the first dividing potential drop electric capacity (C
Dc1) negative terminal connect the second dividing potential drop electric capacity (C respectively
Dc2) anode, the 7th power switch pipe (S
7) emitter, the 8th power switch pipe (S
8) emitter, the second dividing potential drop electric capacity (C
Dc2) negative terminal connect the first power switch pipe (S respectively
1) source electrode, the 4th power switch pipe (S
4) source electrode; First power switch pipe (the S
1) drain electrode connect the second power switch pipe (S respectively
2) emitter, the first filter inductance (L
1) an end; Second power switch pipe (the S
2) collector electrode connect the 3rd power switch pipe (S respectively
3) source electrode, the 8th power switch pipe (S
8) collector electrode; The 4th power switch pipe (S
4) drain electrode connect the 5th power switch pipe (S respectively
5) emitter, the second filter inductance (L
2) an end; The 5th power switch pipe (S
5) collector electrode connect the 6th power switch pipe (S respectively
6) source electrode, the 7th power switch pipe (S
7) collector electrode; First filter inductance (the L
1) the other end connect filter capacitor (C respectively
o) an end, electrical network (v
g) an end, the second filter inductance (L
2) the other end connect filter capacitor (C respectively
o) the other end, electrical network (v
g) the other end.
4. neutral point clamp non-isolated grid-connected inverter, its input is connected with solar cell, output is connected with electrical network, it is characterized in that: described neutral point clamp non-isolated grid-connected inverter comprises input dividing potential drop capacitive branch (1), neutral point clamp branch road (2), full-bridge switch unit (3) and network access filter branches (4); Wherein importing dividing potential drop capacitive branch (1), neutral point clamp branch road (2), full-bridge switch unit (3), network access filter branches (4) connects successively;
Input dividing potential drop capacitive branch (1) comprises by the first dividing potential drop electric capacity (C
Dc1), the second dividing potential drop electric capacity (C
Dc2);
Neutral point clamp branch road (2) comprises the 7th power switch pipe (S
7), the 8th power switch pipe (S
8);
Full-bridge switch unit (3) comprises the first power switch pipe (S
1), the second power switch pipe (S
2), the 3rd power switch pipe (S
3), the 4th power switch pipe (S
4), the 5th power switch pipe (S
5), the 6th power switch pipe (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 electric capacity (C
Dc1) anode connect solar cell positive output end, the 3rd power switch pipe (S respectively
3) drain electrode, the 6th power switch pipe (S
6) drain electrode, the first dividing potential drop electric capacity (C
Dc1) negative terminal connect the 7th power switch pipe (S respectively
7) collector electrode, the 8th power switch pipe (S
8) collector electrode, the second dividing potential drop electric capacity (C
Dc2) anode, the second dividing potential drop electric capacity (C
Dc2) negative terminal connect the first power switch pipe (S respectively
1) source electrode, the 4th power switch pipe (S
4) source electrode; First power switch pipe (the S
1) drain electrode connect the second power switch pipe (S respectively
2) emitter, the 7th power switch pipe (S
7) emitter; Second power switch pipe (the S
2) collector electrode connect the 3rd power switch pipe (S respectively
3) source electrode, the first filter inductance (L
1) an end; The 4th power switch pipe (S
4) drain electrode connect the 5th power switch pipe (S respectively
5) collector electrode, the 8th power switch pipe (S
8) emitter; The 5th power switch pipe (S
5) collector electrode connect the 6th power switch pipe (S respectively
6) source electrode, the second filter inductance (L
2) an end; First filter inductance (the L
1) the other end connect filter capacitor (C respectively
o) an end, electrical network (v
g) an end, the second filter inductance (L
2) the other end connect filter capacitor (C respectively
o) the other end, electrical network (v
g) the other end.
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 |
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| 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 |
|---|---|
| CN102163852A true CN102163852A (en) | 2011-08-24 |
| CN102163852B CN102163852B (en) | 2014-02-26 |
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ID=44464896
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110061521.4A Expired - Fee Related CN102163852B (en) | 2011-03-15 | 2011-03-15 | Neutral point clamped non-isolated photovoltaic grid-connected inverter |
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| CN (1) | CN102163852B (en) |
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| CN108347191A (en) * | 2018-03-15 | 2018-07-31 | 国网上海市电力公司 | A kind of single-phase photovoltaic grid-connected inversion topological structure of non-isolation type |
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| WO2021026876A1 (en) * | 2019-08-15 | 2021-02-18 | Tridonic Gmbh & Co Kg | Driver module and lighting system suitable for use in a humid environment |
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