CN102684218B - Non-isolating photovoltaic grid-connected inverter - Google Patents
Non-isolating photovoltaic grid-connected inverter Download PDFInfo
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- CN102684218B CN102684218B CN201110062668.5A CN201110062668A CN102684218B CN 102684218 B CN102684218 B CN 102684218B CN 201110062668 A CN201110062668 A CN 201110062668A CN 102684218 B CN102684218 B CN 102684218B
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- power switch
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Classifications
-
- 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 non-isolating photovoltaic grid-connected inverter and belongs to the technical field of a power electronic convertor. The non-isolating photovoltaic grid-connected inverter provided by the invention comprises an input capacitance branch, a full-bridge switch unit and a network access filter branch, wherein full-bridge switch circuits are divided into a six-switch full-bridge switch circuit and a seven-switch full-bridge switch circuit according to the quantity of the switch. The non-isolating photovoltaic grid-connected inverter is characterized in that an auxiliary switch is added on the basis of a basic full-bridge circuit so as to realize a continuous current circuit potential being or approximate to 1/2 battery voltage in a continuous current stage and eliminate the leaked current of the non-isolating photovoltaic grid-connected inverter. Compared with the present non-isolating photovoltaic grid-connected inverter topology, the non-isolating photovoltaic grid-connected inverter has the advantages that: the quantity of switch tubes of a current circuit is reduced, so that the conduction loss is reduced and the converting efficiency is increased, and the non-isolating photovoltaic grid-connected inverter is suitable for a photovoltaic grid-connected occasion being free from transformer isolation.
Description
Technical field
The present invention relates to a kind of 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 increase 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 hardly common mode leakage current.But compared 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 EP1369985A2 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 US7411802B2 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 current path exists three switching devices all the time, and on-state loss is large.And 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 the 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.
Summary of the invention
Technical problem to be solved by this invention is the deficiency for above-mentioned background technology, and a kind of non-isolated grid-connected inverter having compared with high conversion efficiency is provided.
The present invention adopts following technical scheme for achieving the above object:
A kind of non-isolated grid-connected inverter, its input is connected with solar cell, and output is connected with electrical network, and described non-isolated grid-connected inverter comprises input capacitance branch road, full-bridge switch unit and network access filter branches; Wherein input capacitance branch road, full-bridge switch unit, network access filter branches connect successively;
Input capacitance branch road comprises input capacitance;
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 input capacitance connects respectively the drain electrode of solar cell positive output end, the first power switch pipe, the drain electrode of the 6th power switch pipe, and the negative terminal of input capacitance connects respectively the source electrode of solar cell negative output terminal, the 3rd power switch pipe, the source electrode of the 5th 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 4th power switch pipe; The emitter of the second power switch pipe connects respectively the drain electrode of the 3rd power switch pipe, the source electrode of the 6th power switch pipe, one end of the first filter inductance, the emitter of the 4th power switch pipe connects respectively the drain electrode of the 5th 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.
A kind of non-isolated grid-connected inverter, its input is connected with solar cell, and output is connected with electrical network, and described non-isolated grid-connected inverter comprises input capacitance branch road, full-bridge switch unit and network access filter branches; Wherein input capacitance branch road, full-bridge switch unit, network access filter branches connect successively;
Input capacitance branch road comprises the first input dividing potential drop electric capacity, the second input dividing potential drop electric capacity;
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, the 7th power switch pipe;
Network access filter branches comprises the first filter inductance, the second filter inductance, filter capacitor;
The anode of the first input dividing potential drop electric capacity connects respectively the positive output end of solar cell, the drain electrode of the first power switch pipe, the drain electrode of the 7th power switch pipe, the negative terminal of the first input dividing potential drop electric capacity connects respectively the anode of the second input dividing potential drop electric capacity, the source electrode of the 6th power switch pipe, the negative terminal of the second dividing potential drop electric capacity connects respectively the negative output terminal of solar cell, the source electrode of the 3rd power switch pipe, the source electrode of the 5th 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 4th power switch pipe, the drain electrode of the 6th 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 emitter of the 4th power switch pipe connects respectively the drain electrode of the 5th power switch pipe, the source electrode of the 7th 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, 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 non-isolated grid-connected inverter, its input is connected with solar cell, and output is connected with electrical network, and described non-isolated grid-connected inverter comprises input capacitance branch road, full-bridge switch unit and network access filter branches; Wherein input capacitance branch road, full-bridge switch unit, network access filter branches connect successively;
Input capacitance branch road comprises the first input dividing potential drop electric capacity, the second input dividing potential drop electric capacity;
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, the 7th power switch pipe;
Network access filter branches comprises the first filter inductance, the second filter inductance, filter capacitor;
The anode of the first input dividing potential drop electric capacity connects respectively the positive output end of solar cell, the drain electrode of the first power switch pipe, the drain electrode of the 7th power switch pipe, the negative terminal of the first input dividing potential drop electric capacity connects respectively the anode of the second input dividing potential drop electric capacity, the source electrode of the 6th power switch pipe, the negative terminal of the second dividing potential drop electric capacity connects respectively the negative output terminal of solar cell, the source electrode of the 3rd power switch pipe, the source electrode of the 5th 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 4th power switch pipe, the drain electrode of the 6th power switch pipe, the emitter of the second power switch pipe connects respectively the drain electrode of the 3rd power switch pipe, the source electrode of the 7th power switch pipe, one end of the first filter inductance, the emitter of the 4th power switch pipe connects respectively the drain electrode of the 5th 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, 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 non-isolated grid-connected inverter, its input is connected with solar cell, and output is connected with electrical network, and described non-isolated grid-connected inverter comprises input capacitance branch road, full-bridge switch unit and network access filter branches; Wherein input capacitance branch road, full-bridge switch unit, network access filter branches connect successively;
Input capacitance branch road comprises the first input dividing potential drop electric capacity, the second input dividing potential drop electric capacity;
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, the 7th power switch pipe;
Network access filter branches comprises the first filter inductance, the second filter inductance, filter capacitor;
The anode of the first input dividing potential drop electric capacity connects respectively the positive output end of solar cell, the drain electrode of the 3rd power switch pipe, the drain electrode of the 5th power switch pipe, the negative terminal of the first input dividing potential drop electric capacity connects respectively the anode of the second input dividing potential drop electric capacity, the drain electrode of the 6th power switch pipe, the negative terminal of the second input dividing potential drop electric capacity connects respectively the negative output terminal of solar cell, the source electrode of the first power switch pipe, the source electrode of the 7th 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 4th power switch pipe, the source electrode of the 6th 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 collector electrode of the 4th power switch pipe connects respectively the source electrode of the 5th power switch pipe, the drain electrode of the 7th 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, 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 non-isolated grid-connected inverter, its input is connected with solar cell, and output is connected with electrical network, and described non-isolated grid-connected inverter comprises input capacitance branch road, full-bridge switch unit and network access filter branches; Wherein input capacitance branch road, full-bridge switch unit, network access filter branches connect successively;
Input capacitance branch road comprises the first input dividing potential drop electric capacity, the second input dividing potential drop electric capacity;
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, the 7th power switch pipe;
Network access filter branches comprises the first filter inductance, the second filter inductance, filter capacitor;
The anode of the first input dividing potential drop electric capacity connects respectively the positive output end of solar cell, the drain electrode of the 3rd power switch pipe, the drain electrode of the 5th power switch pipe, the negative terminal of the first input dividing potential drop electric capacity connects respectively the anode of the second input dividing potential drop electric capacity, the drain electrode of the 6th power switch pipe, the negative terminal of the second input dividing potential drop electric capacity connects respectively the negative output terminal of solar cell, the source electrode of the first power switch pipe, the source electrode of the 7th 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 4th power switch pipe, the source electrode of the 6th power switch pipe, the collector electrode of the second power switch pipe connects respectively the source electrode of the 3rd power switch pipe, the drain electrode of the 7th power switch pipe, one end of the first filter inductance, the collector electrode of the 4th power switch pipe connects respectively the source electrode of the 5th 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, the other end of the second filter inductance connects respectively the other end of filter capacitor, the other end of electrical network.
The present invention adopts technique scheme, has following beneficial effect:
(1) on the basis of full-bridge circuit, add auxiliary switch, while realizing the afterflow stage continuous current circuit current potential in or approximate in 1/2nd cell voltage;
(2) reduce current path switching tube quantity, thereby reduced on-state loss, improved conversion efficiency.
Brief description of the drawings
Fig. 1 is the circuit structure diagram of non-isolated grid-connected inverter of the present invention;
Fig. 2 is six switch non-isolated grid-connected inverter circuit topology embodiment mono-of the present invention;
Fig. 3 is six switch non-isolated grid-connected inverter circuit topology embodiment bis-of the present invention;
Fig. 4 is six switch non-isolated grid-connected inverter circuit topology embodiment tri-of the present invention;
Fig. 5 is six switch non-isolated grid-connected inverter circuit topology embodiment tetra-of the present invention;
Fig. 6 is the drive principle waveform of six switch non-isolated grid-connected inverter embodiment mono-of the present invention;
Fig. 7 is each switch mode equivalent circuit diagram of six switch non-isolated grid-connected inverter embodiment mono-of the present invention.
Fig. 8 is that minion of the present invention is closed non-isolated grid-connected inverter circuit topology embodiment mono-;
Fig. 9 is that minion of the present invention is closed non-isolated grid-connected inverter circuit topology embodiment bis-;
Figure 10 is that minion of the present invention is closed non-isolated grid-connected inverter circuit topology embodiment tri-;
Figure 11 is that minion of the present invention is closed non-isolated grid-connected inverter circuit topology embodiment tetra-;
Figure 12 is the drive principle waveform that minion of the present invention is closed non-isolated grid-connected inverter embodiment mono-;
Figure 13 is each switch mode equivalent circuit diagram that minion of the present invention is closed non-isolated grid-connected inverter embodiment mono-.
Symbol description in figure:
U
pV-photovoltaic cell voltage, 1-input capacitance branch road, 2-improvement full-bridge switch unit, 3-network access filter branches, v
g-electrical network, C
dc-input capacitance, C
dc1, C
dc2-first, second dividing potential drop electric capacity, S
1～S
7the-the first～seven 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
gs7the driving voltage of the-the first～seven power switch pipe, 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.
Accompanying drawing 2 is six switch non-isolated grid-connected inverter circuit topology embodiment mono-, and its electric circuit constitute is: by input capacitance C
dc, the first to the 6th power switch tube S
1～S
6, first, second filter inductance L
1, L
2with filter capacitor C
oform.
Wherein, input capacitance C
dcanode connect respectively solar cell positive output end, the first power switch tube S
1drain electrode, the 6th power switch tube S
6drain electrode, input capacitance C
dcnegative terminal connect respectively solar cell negative output terminal, the 3rd power switch tube S
3source electrode, the 5th power switch tube S
5source electrode; The first power switch tube S
1source electrode connect respectively the second power switch tube S
2collector electrode, the 4th power switch tube S
4collector 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
4emitter connect respectively the 5th power switch tube S
5drain electrode, 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.
Accompanying drawing 3 is six switch non-isolated grid-connected inverter circuit topology embodiment bis-, and its electric circuit constitute is with attached embodiment illustrated in fig. 2 one identical, but the 6th power switch tube S
6source electrode connect respectively the second power switch tube S
2emitter, power switch tube S
3drain electrode, the first filter inductance L
1one end.
Accompanying drawing 4 is six switch non-isolated grid-connected inverter circuit topology embodiment tri-, and its electric circuit constitute is with attached embodiment illustrated in fig. 2 one identical, but its circuit connecting relation is, input capacitance C
dcanode connect respectively solar cell positive output end, the second power switch tube S
2drain electrode, the 4th power switch tube S
4drain electrode, input capacitance C
dcnegative terminal connect respectively solar cell negative output terminal, the first power switch tube S
1source electrode, the 6th power switch tube S
6source electrode, the first power switch tube S
1drain electrode connect respectively the 3rd power switch tube S
3emitter, the 5th power switch tube S
5emitter, the second power switch tube S
2source electrode connect respectively the 3rd power switch tube S
3collector 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 6th power switch tube S
6drain 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.
Accompanying drawing 5 is six switch non-isolated grid-connected inverter circuit topology embodiment tetra-, and its electric circuit constitute is with attached embodiment illustrated in fig. 4 three identical, but the 6th power switch tube S
6drain electrode connect respectively the second power switch tube S
2source electrode, the 3rd power switch tube S
3collector electrode, the first filter inductance L
1one end.
Accompanying drawing 6 is drive principle work waves of six switch non-isolated grid-connected inverter circuit topology embodiment mono-, the first power switch tube S
1with the 3rd power switch tube S
3driving signal is identical, turn-offs at the positive half cycle of grid current, and negative half period is by Unipolar SPWM mode high-frequency work; The second power switch tube S
2straight-through at the positive half cycle of grid current, negative half period and the first power switch tube S
1the complementation of driving signal, and add Dead Time; The 5th power switch tube S
5with the 6th power switch tube S
6driving signal is identical, and at the positive half cycle of network access, by Unipolar SPWM mode high-frequency work, negative half period turn-offs; The 4th power switch tube S
4in the positive half cycle of grid current and the 5th power switch tube S
5the complementation of driving signal, and add Dead Time, negative half period is straight-through; As modulation signal v
ebe greater than triangular carrier signal v
sttime, driving signal is high level, otherwise is low level.
Accompanying drawing 7 is each switch mode equivalent circuit diagrams of six switch non-isolated grid-connected inverter circuit topology embodiment mono-.
Mode 1: equivalent electric circuit as shown in Fig. 7 (a), first, second, the 5th power switch pipe conducting, other power switch pipe turn-offs, 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;
Mode 2: equivalent electric circuit as shown in Fig. 7 (b), second, the 4th power switch pipe conducting, other power switch pipe turn-offs, by the second power switch tube S
2with the 4th power switch tube S
4body diode form continuous current circuit, continuous current circuit current potential is approximately photovoltaic cell voltage U
pVhalf;
Mode 3: equivalent electric circuit as shown in Fig. 7 (c), the 3rd, the 4th, the 6th power switch pipe conducting, other power switch pipe turn-offs, the 4th power switch tube S
4have driving signal, but do not have electric current to flow through, grid current flows through the 6th power switch tube S successively
6, 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. 7 (d), second, four power switch pipe conductings, other power switch pipe turn-offs, by the second power switch tube S
2body diode and the 4th power switch tube S
4form continuous current circuit, continuous current circuit current potential is approximately photovoltaic cell voltage U
pVhalf.
Accompanying drawing 8 is that minion is closed non-isolated grid-connected inverter circuit topology embodiment mono-, and its electric circuit constitute is: by first, second input dividing potential drop capacitor C
dc1, C
dc2, the first to the 7th power switch tube S
1～S
7, first, second filter inductance L
1, L
2with filter capacitor C
oform.
Wherein, the first input dividing potential drop capacitor C
dc1anode connect respectively positive output end, first power switch tube S of solar cell
1drain electrode, the 7th power switch tube S
7drain electrode, the first input dividing potential drop capacitor C
dc1negative terminal connect respectively the second input dividing potential drop capacitor C
dc2anode, the 6th power switch tube S
6drain electrode, the second dividing potential drop capacitor C
dc2negative terminal connect respectively negative output terminal, the 3rd power switch tube S of solar cell
3source electrode, the 5th power switch tube S
5source electrode, the first power switch tube S
1source electrode connect respectively the second power switch tube S
2collector electrode, the 4th power switch tube S
4collector electrode, the 6th power switch tube S
6drain 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
4emitter connect respectively drain electrode, the 7th power switch tube S of the 5th power switch tube S
7source 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.
Accompanying drawing 9 is that minion is closed non-isolated grid-connected inverter circuit topology embodiment bis-, and its electric circuit constitute is with attached embodiment illustrated in fig. 8 one identical, but the 7th power switch tube S
7source electrode connect respectively the second power switch tube S
2emitter, the 3rd power switch tube S
3drain electrode, the first filter inductance L
1one end.
Accompanying drawing 10 is that minion is closed non-isolated grid-connected inverter circuit topology embodiment tri-, and its electric circuit constitute is with attached embodiment illustrated in fig. 8 one identical, but circuit connecting relation is that first inputs dividing potential drop capacitor C
dc1anode connect respectively positive output end, the 3rd power switch tube S of solar cell
3drain electrode, the 5th power switch tube S
5drain electrode, the first input dividing potential drop capacitor C
dc1negative terminal connect respectively the second input dividing potential drop capacitor C
dc2anode, the 6th power switch tube S
6drain electrode, the second input dividing potential drop capacitor C
dc2negative terminal connect respectively the first power switch tube S
1source electrode, the 7th power switch tube S
7source electrode, the first power switch tube S
1drain electrode connect respectively the second power switch tube S
2emitter, the 4th power switch tube S
4emitter, the 6th power switch tube S
6source electrode, 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
4collector electrode connect respectively the 5th power switch tube S
5source electrode, the 7th power switch tube S
7drain 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.
Accompanying drawing 11 is that minion is closed non-isolated grid-connected inverter circuit topology embodiment tetra-, and its electric circuit constitute is with attached embodiment illustrated in fig. 10 three identical, but the 7th power switch tube S
7drain electrode connect respectively the second power switch tube S
2collector electrode, the 3rd power switch tube S
3source electrode, the first filter inductance L
1one end.
Accompanying drawing 12 is drive principle work waves that minion is closed non-isolated grid-connected inverter circuit topology embodiment mono-, the first power switch tube S
1with the 3rd power switch tube S
3driving signal is identical, turn-offs at the positive half cycle of grid current, and negative half period is by the action of Unipolar SPWM mode high frequency; The second power switch tube S
2straight-through at the positive half cycle of grid current, negative half period and the first power switch tube S
1the complementation of driving signal, and add Dead Time; The 5th power switch tube S
5with the 7th power switch tube S
7driving signal is identical, and at the positive half cycle of grid current, by the action of Unipolar SPWM mode high frequency, negative half period turn-offs; The 4th power switch tube S
4in the positive half cycle of grid current and the 5th power switch tube S
5the complementation of driving signal, and add Dead Time, negative half period is straight-through; The 6th power switch tube S
6in the positive half cycle of grid current and the 5th power switch tube S
5the complementation of driving signal, and add Dead Time, negative half period and the first power switch tube S
1the complementation of driving signal, and add Dead Time; As modulation signal v
ebe greater than triangular carrier signal v
sttime, driving signal is high level, otherwise is low level.
Accompanying drawing 13 is each switch mode equivalent circuit diagrams that minion is closed non-isolated grid-connected inverter circuit topology embodiment mono-.
Mode 1: equivalent electric circuit as shown in Figure 13 (a), first, second, the 5th power switch pipe conducting, other power switch pipe turn-offs, grid current flows through the first power switch tube S successively
1, the 3rd power switch tube S
3, the first filter inductance L
1, electrical network v
g, the second filter inductance L
2, the 5th power switch tube S
5;
Mode 2: equivalent electric circuit as shown in Figure 13 (b), second, the 4th, the 6th power switch pipe conducting, other power switch pipe turn-offs, by the second power switch tube S
2with the 4th power switch tube S
4body diode form continuous current circuit, and by the mid point of first, second dividing potential drop electric capacity by the 6th power switch tube S
6continuous current circuit current potential is clamped to cell voltage U
pVhalf;
Mode 3: equivalent electric circuit as shown in Figure 13 (c), the 3rd, the 4th, the 7th power switch pipe conducting, other power switch pipe turn-offs, the 4th power switch tube S
4have driving signal, but do not have electric current to flow through, grid current flows through the 7th power switch tube S successively
7, 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 Figure 13 (d), second, four, the 6th power switch pipe conducting, other power switch pipe turn-offs, by the second power switch tube S
2body diode and the 4th power switch tube S
4form continuous current circuit, and pass through the 6th power switch tube S by the mid point of first, second dividing potential drop electric capacity
6continuous current circuit current potential is clamped to cell voltage U
pVhalf;
Visible, regardless of the direction of grid current, in the afterflow stage, continuous current circuit current potential is clamped at battery electricity U all the time
pVhalf.
Claims (5)
1. a non-isolated grid-connected inverter, its input is connected with solar cell, output is connected with electrical network, it is characterized in that: described non-isolated grid-connected inverter comprises input capacitance branch road (1), full-bridge switch unit (2) and network access filter branches (3); Wherein input capacitance branch road (1), full-bridge switch unit (2), network access filter branches (3) connect successively;
Input capacitance branch road (1) comprises input capacitance (C
dc);
Full-bridge switch unit (2) 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 (3) comprises the first filter inductance (L
1), the second filter inductance (L
2), filter capacitor (C
o);
Input capacitance (C
dc) anode connect respectively solar cell positive output end, the first power switch pipe (S
1) drain electrode, the 6th power switch pipe (S
6) drain electrode, input capacitance (C
dc) negative terminal connect respectively solar cell negative output terminal, the 3rd power switch pipe (S
3) source electrode, the 5th power switch pipe (S
5) source electrode; The first power switch pipe (S
1) source electrode connect respectively the second power switch pipe (S
2) collector electrode, the 4th power switch pipe (S
4) collector electrode; The second power switch pipe (S
2) emitter connect respectively the 3rd power switch pipe (S
3) drain electrode, the 6th power switch pipe (S
6) source electrode, the first filter inductance (L
1) one end, the 4th power switch pipe (S
4) emitter connect respectively the 5th power switch pipe (S
5) drain electrode, the second filter inductance (L
2) one end, the first filter inductance (L
1) the other end connect respectively filter capacitor (C
o) one end, electrical network (v
g) one end, the other end of the second filter inductance (L2) connects respectively the other end of filter capacitor (Co), electrical network (v
g) the other end.
2. a non-isolated grid-connected inverter, its input is connected with solar cell, output is connected with electrical network, it is characterized in that: described non-isolated grid-connected inverter comprises input capacitance branch road (1), full-bridge switch unit (2) and network access filter branches (3); Wherein input capacitance branch road (1), full-bridge switch unit (2), network access filter branches (3) connect successively;
Input capacitance branch road (1) comprises the first input dividing potential drop electric capacity (C
dc1), the second input dividing potential drop electric capacity (C
dc2);
Full-bridge switch unit (2) 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), the 7th power switch pipe (S
7);
Network access filter branches (3) comprises the first filter inductance (L
1), the second filter inductance (L
2), filter capacitor (C
o);
The first input dividing potential drop electric capacity (C
dc1) anode connect respectively positive output end, the first power switch pipe (S of solar cell
1) drain electrode, the 7th power switch pipe (S
7) drain electrode, the first input dividing potential drop electric capacity (C
dc1) negative terminal connect respectively the second input dividing potential drop electric capacity (C
dc2) anode, the 6th power switch pipe (S
6) source electrode, the second dividing potential drop electric capacity (C
dc2) negative terminal connect respectively negative output terminal, the 3rd power switch pipe (S of solar cell
3) source electrode, the 5th power switch pipe (S
5) source electrode, the first power switch pipe (S
1) source electrode connect respectively the second power switch pipe (S
2) collector electrode, the 4th power switch pipe (S
4) collector electrode, the 6th power switch pipe (S
6) drain 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) emitter connect respectively the 5th power switch pipe (S
5) drain electrode, the 7th power switch pipe (S
7) source electrode, the second filter inductance (L
2) one end, 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.
3. a non-isolated grid-connected inverter, its input is connected with solar cell, output is connected with electrical network, it is characterized in that: described non-isolated grid-connected inverter comprises input capacitance branch road (1), full-bridge switch unit (2) and network access filter branches (3); Wherein input capacitance branch road (1), full-bridge switch unit (2), network access filter branches (3) connect successively;
Input capacitance branch road (1) comprises the first input dividing potential drop electric capacity (C
dc1), the second input dividing potential drop electric capacity (C
dc2);
Full-bridge switch unit (2) 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), the 7th power switch pipe (S
7);
Network access filter branches (3) comprises the first filter inductance (L
1), the second filter inductance (L
2), filter capacitor (C
o);
The first input dividing potential drop electric capacity (C
dc1) anode connect respectively positive output end, the first power switch pipe (S of solar cell
1) drain electrode, the 7th power switch pipe (S
7) drain electrode, the first input dividing potential drop electric capacity (C
dc1) negative terminal connect respectively the second input dividing potential drop electric capacity (C
dc2) anode, the 6th power switch pipe (S
6) source electrode, the second dividing potential drop electric capacity (C
dc2) negative terminal connect respectively negative output terminal, the 3rd power switch pipe (S of solar cell
3) source electrode, the 5th power switch pipe (S
5) source electrode, the first power switch pipe (S
1) source electrode connect respectively the second power switch pipe (S
2) collector electrode, the 4th power switch pipe (S
4) collector electrode, the 6th power switch pipe (S
6) drain electrode, the second power switch pipe (S
2) emitter connect respectively the 3rd power switch pipe (S
3) drain electrode, the 7th power switch pipe (S
7) source electrode, the first filter inductance (L
1) one end, the 4th power switch pipe (S
4) emitter connect respectively the 5th power switch pipe (S
5) drain electrode, the second filter inductance (L
2) one end, 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.
4. a non-isolated grid-connected inverter, its input is connected with solar cell, output is connected with electrical network, it is characterized in that: described non-isolated grid-connected inverter comprises input capacitance branch road (1), full-bridge switch unit (2) and network access filter branches (3); Wherein input capacitance branch road (1), full-bridge switch unit (2), network access filter branches (3) connect successively;
Input capacitance branch road (1) comprises the first input dividing potential drop electric capacity (C
dc1), the second input dividing potential drop electric capacity (C
dc2);
Full-bridge switch unit (2) 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), the 7th power switch pipe (S
7);
Network access filter branches (3) comprises the first filter inductance (L
1), the second filter inductance (L
2), filter capacitor (C
o);
The first input dividing potential drop electric capacity (C
dc1) anode connect respectively positive output end, the 3rd power switch pipe (S of solar cell
3) drain electrode, the 5th power switch pipe (S
5) drain electrode, the first input dividing potential drop electric capacity (C
dc1) negative terminal connect respectively the second input dividing potential drop electric capacity (C
dc2) anode, the 6th power switch pipe (S
6) drain electrode, the second input dividing potential drop electric capacity (C
dc2) negative terminal connect respectively negative output terminal, the first power switch pipe (S of solar cell
1) source electrode, the 7th power switch pipe (S
7) source electrode, the first power switch pipe (S
1) drain electrode connect respectively the second power switch pipe (S
2) emitter, the 4th power switch pipe (S
4) emitter, the 6th power switch pipe (S
6) source electrode, the second power switch pipe (S
2) collector electrode connect respectively the 3rd power switch pipe (S
3) source electrode, the first filter inductance (L
1) one end, the 4th power switch pipe (S
4) collector electrode connect respectively the 5th power switch pipe (S
5) source electrode, the 7th power switch pipe (S
7) drain electrode, the second filter inductance (L
2) one end, 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.
5. a non-isolated grid-connected inverter, its input is connected with solar cell, output is connected with electrical network, it is characterized in that: described non-isolated grid-connected inverter comprises input capacitance branch road (1), full-bridge switch unit (2) and network access filter branches (3); Wherein input capacitance branch road (1), full-bridge switch unit (2), network access filter branches (3) connect successively;
Input capacitance branch road (1) comprises the first input dividing potential drop electric capacity (C
dc1), the second input dividing potential drop electric capacity (C
dc2);
Full-bridge switch unit (2) 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), the 7th power switch pipe (S
7);
Network access filter branches (3) comprises the first filter inductance (L
1), the second filter inductance (L
2), filter capacitor (C
o);
The first input dividing potential drop electric capacity (C
dc1) anode connect respectively positive output end, the 3rd power switch pipe (S of solar cell
3) drain electrode, the 5th power switch pipe (S
5) drain electrode, the first input dividing potential drop electric capacity (C
dc1) negative terminal connect respectively the second input dividing potential drop electric capacity (C
dc2) anode, the 6th power switch pipe (S
6) drain electrode, the second input dividing potential drop electric capacity (C
dc2) negative terminal connect respectively negative output terminal, the first power switch pipe (S of solar cell
1) source electrode, the 7th power switch pipe (S
7) source electrode, the first power switch pipe (S
1) drain electrode connect respectively the second power switch pipe (S
2) emitter, the 4th power switch pipe (S
4) emitter, the 6th power switch pipe (S
6) source electrode, the second power switch pipe (S
2) collector electrode connect respectively the 3rd power switch pipe (S
3) source electrode, the 7th power switch pipe (S
7) drain electrode, the first filter inductance (L
1) one end, the 4th power switch pipe (S
4) collector electrode connect respectively the 5th power switch pipe (S
5) source electrode, the second filter inductance (L
2) one end, 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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110062668.5A CN102684218B (en) | 2011-03-16 | 2011-03-16 | Non-isolating photovoltaic grid-connected inverter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110062668.5A CN102684218B (en) | 2011-03-16 | 2011-03-16 | Non-isolating photovoltaic grid-connected inverter |
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| Publication Number | Publication Date |
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| CN102684218A CN102684218A (en) | 2012-09-19 |
| CN102684218B true CN102684218B (en) | 2014-07-16 |
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| DE10221592A1 (en) * | 2002-05-15 | 2003-12-04 | Fraunhofer Ges Forschung | Current inverter for direct/alternating currents, has direct and alternating connections with an intermediate power store, a bridge circuit, rectifier diodes and a inductive choke |
| CN201515320U (en) * | 2009-10-12 | 2010-06-23 | 深圳科士达科技股份有限公司 | Grid-connected inverter |
| CN201550040U (en) * | 2009-10-12 | 2010-08-11 | 深圳科士达科技股份有限公司 | grid-connected inverter |
| CN201536328U (en) * | 2009-10-12 | 2010-07-28 | 深圳科士达科技股份有限公司 | grid-connected inverter |
| CN101741275B (en) * | 2010-01-15 | 2011-11-30 | 南京航空航天大学 | Control method of modular full-bridge grid-connected inverters capable of parallel operation |
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Inventor after: Zhang Li Inventor after: Xing Yan Inventor after: Feng Lanlan Inventor after: Huang Xiaobo Inventor before: Zhang Li Inventor before: Xing Yan Inventor before: Feng Lanlan |
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