CN102684218A - Non-isolating photovoltaic grid-connected inverter - Google Patents

Non-isolating photovoltaic grid-connected inverter Download PDF

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Publication number
CN102684218A
CN102684218A CN2011100626685A CN201110062668A CN102684218A CN 102684218 A CN102684218 A CN 102684218A CN 2011100626685 A CN2011100626685 A CN 2011100626685A CN 201110062668 A CN201110062668 A CN 201110062668A CN 102684218 A CN102684218 A CN 102684218A
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China
Prior art keywords
power switch
switch pipe
connect respectively
filter
filter inductance
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CN2011100626685A
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CN102684218B (en
Inventor
张犁
邢岩
冯兰兰
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Nanjing University of Aeronautics and Astronautics
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Nanjing University of Aeronautics and Astronautics
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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 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

Non-isolated grid-connected inverter
Technical field
The present invention relates to a kind of 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 possibly 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 receives such as little like 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 1369985 A2 propose 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 7411802 B2 only introduce a HF switch at photovoltaic cell side anode, can realize that equally afterflow stage solar cell end and electrical network break away from, but there are three switching devices all the time in current path, and on-state loss is big.And 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 the half the 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.
Summary of the invention
Technical problem to be solved by this invention is to the deficiency of above-mentioned background technology, and a kind of non-isolated grid-connected inverter with higher conversion efficiency is provided.
The present invention adopts following technical scheme for realizing the foregoing invention purpose:
A kind of non-isolated grid-connected inverter, its input is connected with solar cell, and output is connected with electrical network, and said 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;
The input capacitance branch road comprises input capacitance;
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 input capacitance connects the drain electrode of solar cell positive output end, first power switch pipe, the drain electrode of the 6th power switch pipe respectively, and the negative terminal of input capacitance connects the source electrode of solar cell negative output terminal, the 3rd power switch pipe, the source electrode of the 5th 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 4th 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 emitter of the 4th power switch pipe connects the drain electrode of the 5th power switch pipe, 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.
A kind of non-isolated grid-connected inverter, its input is connected with solar cell, and output is connected with electrical network, and said 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;
The input capacitance branch road comprises input capacitance;
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 input capacitance connects the drain electrode of solar cell positive output end, first power switch pipe, the drain electrode of the 6th power switch pipe respectively, and the negative terminal of input capacitance connects the source electrode of solar cell negative output terminal, the 3rd power switch pipe, the source electrode of the 5th 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 4th power switch pipe respectively; The emitter of second power switch pipe connects the drain electrode of the 3rd power switch pipe, the source electrode of the 6th power switch pipe, an end of first filter inductance respectively; The emitter of the 4th power switch pipe connects the drain electrode of the 5th 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.
A kind of non-isolated grid-connected inverter, its input is connected with solar cell, and output is connected with electrical network, and said 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;
The input capacitance branch road comprises input capacitance;
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 input capacitance connects the drain electrode of solar cell positive output end, second power switch pipe, the drain electrode of the 4th power switch pipe respectively; The negative terminal of input capacitance connects the source electrode of solar cell negative output terminal, first power switch pipe, the source electrode of the 6th power switch pipe respectively; The drain electrode of first power switch pipe connects the emitter of the 3rd power switch pipe, the emitter of the 5th power switch pipe respectively; The source electrode of second power switch pipe connects the collector 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, the drain 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.
A kind of non-isolated grid-connected inverter, its input is connected with solar cell, and output is connected with electrical network, and said 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;
The input capacitance branch road comprises input capacitance;
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 input capacitance connects the drain electrode of solar cell positive output end, second power switch pipe, the drain electrode of the 4th power switch pipe respectively; The negative terminal of input capacitance connects the source electrode of solar cell negative output terminal, first power switch pipe, the source electrode of the 6th power switch pipe respectively; The drain electrode of first power switch pipe connects the emitter of the 3rd power switch pipe, the emitter of the 5th power switch pipe respectively; The source electrode of second power switch pipe connects the collector electrode of the 3rd power switch pipe, the drain electrode of the 6th 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 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 non-isolated grid-connected inverter, its input is connected with solar cell, and output is connected with electrical network, and said 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;
The input capacitance branch road comprises the first input dividing potential drop electric capacity, the second input dividing potential drop electric capacity;
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 7th power switch pipe;
The network access filter branches comprises first filter inductance, second filter inductance, filter capacitor;
The anode of the first input dividing potential drop electric capacity connects the positive output end of solar cell, the drain electrode of first power switch pipe, the drain electrode of the 7th power switch pipe respectively; The negative terminal of the first input dividing potential drop electric capacity connects the anode of the second input dividing potential drop electric capacity, the source electrode of the 6th power switch pipe respectively; The negative terminal of the second dividing potential drop electric capacity connects 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 respectively; The source electrode of first power switch pipe connects the collector electrode of second power switch pipe, the collector electrode of the 4th power switch pipe, the drain electrode of the 6th 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 emitter of the 4th power switch pipe connects the drain electrode of the 5th power switch pipe, the source electrode of the 7th 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.
A kind of non-isolated grid-connected inverter, its input is connected with solar cell, and output is connected with electrical network, and said 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;
The input capacitance branch road comprises the first input dividing potential drop electric capacity, the second input dividing potential drop electric capacity;
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 7th power switch pipe;
The network access filter branches comprises first filter inductance, second filter inductance, filter capacitor;
The anode of the first input dividing potential drop electric capacity connects the positive output end of solar cell, the drain electrode of first power switch pipe, the drain electrode of the 7th power switch pipe respectively; The negative terminal of the first input dividing potential drop electric capacity connects the anode of the second input dividing potential drop electric capacity, the source electrode of the 6th power switch pipe respectively; The negative terminal of the second dividing potential drop electric capacity connects 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 respectively; The source electrode of first power switch pipe connects the collector electrode of second power switch pipe, the collector electrode of the 4th power switch pipe, the drain electrode of the 6th power switch pipe respectively; The emitter of second power switch pipe connects the drain electrode of the 3rd power switch pipe, the source electrode of the 7th power switch pipe, an end of first filter inductance respectively; The emitter of the 4th power switch pipe connects the drain electrode of the 5th 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.
A kind of non-isolated grid-connected inverter, its input is connected with solar cell, and output is connected with electrical network, and said 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;
The input capacitance branch road comprises the first input dividing potential drop electric capacity, the second input dividing potential drop electric capacity;
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 7th power switch pipe;
The network access filter branches comprises first filter inductance, second filter inductance, filter capacitor;
The anode of the first input dividing potential drop electric capacity connects 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 respectively; The negative terminal of the first input dividing potential drop electric capacity connects the anode of the second input dividing potential drop electric capacity, the drain electrode of the 6th power switch pipe respectively; The negative terminal of the second input dividing potential drop electric capacity connects the negative output terminal of solar cell, the source electrode of first power switch pipe, the source electrode of the 7th power switch pipe respectively; The drain electrode of first power switch pipe connects the emitter of second power switch pipe, the emitter of the 4th power switch pipe, the source electrode of the 6th 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 collector electrode of the 4th power switch pipe connects the source electrode of the 5th power switch pipe, the drain electrode of the 7th 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.
A kind of non-isolated grid-connected inverter, its input is connected with solar cell, and output is connected with electrical network, and said 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;
The input capacitance branch road comprises the first input dividing potential drop electric capacity, the second input dividing potential drop electric capacity;
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 7th power switch pipe;
The network access filter branches comprises first filter inductance, second filter inductance, filter capacitor;
The anode of the first input dividing potential drop electric capacity connects 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 respectively; The negative terminal of the first input dividing potential drop electric capacity connects the anode of the second input dividing potential drop electric capacity, the drain electrode of the 6th power switch pipe respectively; The negative terminal of the second input dividing potential drop electric capacity connects the negative output terminal of solar cell, the source electrode of first power switch pipe, the source electrode of the 7th power switch pipe respectively; The drain electrode of first power switch pipe connects the emitter of second power switch pipe, the emitter of the 4th power switch pipe, the source electrode of the 6th power switch pipe respectively; The collector electrode of second power switch pipe connects the source electrode of the 3rd power switch pipe, the drain electrode of the 7th power switch pipe, an end of first filter inductance respectively; The collector electrode of the 4th power switch pipe connects the source electrode of the 5th 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.
The present invention adopts technique scheme, has following beneficial effect:
(1) on the basis of full-bridge circuit, add auxiliary switch, realize afterflow during the stage continuous current circuit current potential be in or approximate 1/2nd the cell voltage that is in;
(2) reduce current path switching tube quantity, thereby reduced on-state loss, improved conversion efficiency.
Description of 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 one of the present invention;
Fig. 3 is six switch non-isolated grid-connected inverter circuit topology embodiment two of the present invention;
Fig. 4 is six switch non-isolated grid-connected inverter circuit topology embodiment three of the present invention;
Fig. 5 is six switch non-isolated grid-connected inverter circuit topology embodiment four of the present invention;
Fig. 6 is the drive principle waveform of six switch non-isolated grid-connected inverter embodiment one of the present invention;
Fig. 7 is each switch mode equivalent circuit diagram of six switch non-isolated grid-connected inverter embodiment one of the present invention.
Fig. 8 is that minion of the present invention is closed non-isolated grid-connected inverter circuit topology embodiment one;
Fig. 9 is that minion of the present invention is closed non-isolated grid-connected inverter circuit topology embodiment two;
Figure 10 is that minion of the present invention is closed non-isolated grid-connected inverter circuit topology embodiment three;
Figure 11 is that minion of the present invention is closed non-isolated grid-connected inverter circuit topology embodiment four;
Figure 12 is the drive principle waveform that minion of the present invention is closed non-isolated grid-connected inverter embodiment one;
Figure 13 is each switch mode equivalent circuit diagram that minion of the present invention is closed non-isolated grid-connected inverter embodiment one.
Symbol description among the figure:
U PV-photovoltaic cell voltage, 1-input capacitance branch road, 2-improve the 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 7-the first ~ the 7th 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 first ~ the 7th power switch pipe, t-the time.
 
Embodiment
For technological means, creation characteristic that the present invention is realized, reach target and effect and be easy to understand and 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 one, and its circuit composition is: by input capacitance C Dc, first to the 6th power switch pipe S 1~ S 6, first, second filter inductance L 1, L 2And filter capacitor C oConstitute.
Wherein, input capacitance C DcAnode connect solar cell positive output end, first power switch pipe respectively S 1Drain electrode, the 6th power switch pipe S 6Drain electrode, input capacitance C DcNegative terminal connect solar cell negative output terminal, the 3rd power switch pipe respectively S 3Source electrode, the 5th power switch pipe S 5Source electrode; First power switch pipe S 1Source electrode connect second power switch pipe respectively S 2Collector electrode, the 4th power switch pipe S 4Collector electrode; Second power switch pipe S 2Emitter connect the 3rd power switch pipe respectively S 3Drain electrode, first filter inductance L 1An end, the 4th power switch pipe S 4Emitter connect the 5th power switch pipe respectively S 5Drain electrode, the 6th power switch pipe S 6Source electrode, second filter inductance L 2An end, first filter inductance L 1The other end connect filter capacitor respectively C oAn end, electrical network v gAn end, second filter inductance L 2The other end connect filter capacitor respectively C oThe other end, electrical network v gThe other end.
Accompanying drawing 3 is six switch non-isolated grid-connected inverter circuit topology embodiment two, and its circuit is formed identical with accompanying drawing 2 illustrated embodiments one, but the 6th power switch pipe S 6Source electrode connect second power switch pipe respectively S 2Emitter, power switch pipe S 3Drain electrode, first filter inductance L 1An end.
Accompanying drawing 4 is six switch non-isolated grid-connected inverter circuit topology embodiment three, and its circuit is formed identical with accompanying drawing 2 illustrated embodiments one, but its circuit connecting relation is input capacitance C DcAnode connect solar cell positive output end, second power switch pipe respectively S 2Drain electrode, the 4th power switch pipe S 4Drain electrode, input capacitance C DcNegative terminal connect solar cell negative output terminal, first power switch pipe respectively S 1Source electrode, the 6th power switch pipe S 6Source electrode, first power switch pipe S 1Drain electrode connect the 3rd power switch pipe respectively S 3Emitter, the 5th power switch pipe S 5Emitter, second power switch pipe S 2Source electrode connect the 3rd power switch pipe respectively S 3Collector electrode, first filter inductance L 1An end, the 4th power switch pipe S 4Source electrode connect the 5th power switch pipe respectively S 5Collector electrode, the 6th power switch pipe S 6Drain electrode, second filter inductance L 2An end, first filter inductance L 1The other end connect filter capacitor respectively C oAn end, electrical network v gAn end, second filter inductance L 2The other end connect filter capacitor respectively C oThe other end, electrical network v gThe other end.
Accompanying drawing 5 is six switch non-isolated grid-connected inverter circuit topology embodiment four, and its circuit is formed identical with accompanying drawing 4 illustrated embodiments three, but the 6th power switch pipe S 6Drain electrode connect second power switch pipe respectively S 2Source electrode, the 3rd power switch pipe S 3Collector electrode, first filter inductance L 1An end.
Accompanying drawing 6 is drive principle work waves of six switch non-isolated grid-connected inverter circuit topology embodiment one, first power switch pipe S 1With the 3rd power switch pipe S 3Drive signal is identical, turn-offs at the positive half cycle of network access electric current, and negative half period is by Unipolar SPWM mode high-frequency work; Second power switch pipe S 2Straight-through at the positive half cycle of network access electric current, the negative half period and first power switch pipe S 1Drive signal complementary, and add Dead Time; The 5th power switch pipe S 5With the 6th power switch pipe S 6Drive signal is identical, and by Unipolar SPWM mode high-frequency work, negative half period turn-offs at the positive half cycle of network access; The 4th power switch pipe S 4At positive half cycle of network access electric current and the 5th power switch pipe S 5Drive signal complementary, and add Dead Time, negative half period is straight-through; Work as modulation signal v eGreater than the triangular carrier signal v StThe time, drive signal is a high level, otherwise is low level.
Accompanying drawing 7 is each switch mode equivalent circuit diagram of six switch non-isolated grid-connected inverter circuit topology embodiment one.
Mode 1: equivalent electric circuit shown in Fig. 7 (a), first, second, the 5th power switch pipe conducting, other power switch pipe turn-offs, the network access electric current flows through first power switch pipe successively S 1, second power switch pipe S 2, first filter inductance L 1, electrical network v g, second filter inductance L 2, the 5th power switch pipe S 5
Mode 2: equivalent electric circuit shown in Fig. 7 (b), the second, the 4th power switch pipe conducting, other power switch pipe turn-offs, by second power switch pipe S 2With the 4th power switch pipe S 4Body diode constitute continuous current circuit, the continuous current circuit current potential is approximately photovoltaic cell voltage U PVHalf the;
Mode 3: equivalent electric circuit 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 pipe S 4Drive signal is arranged, but do not have electric current to flow through, the network access electric current flows through the 6th power switch pipe successively S 6, second filter inductance L 2, electrical network v g, first filter inductance L 1, the 3rd power switch pipe S 3
Mode 4: equivalent electric circuit shown in Fig. 7 (d), second, four power switch pipe conductings, other power switch pipe turn-offs, by second power switch pipe S 2Body diode and the 4th power switch pipe S 4Constitute continuous current circuit, the continuous current circuit current potential is approximately photovoltaic cell voltage U PVHalf the.
Accompanying drawing 8 is that minion is closed non-isolated grid-connected inverter circuit topology embodiment one, and its circuit composition is: by first, second input dividing potential drop electric capacity C Dc1, C Dc2, first to the 7th power switch pipe S 1~ S 7, first, second filter inductance L 1, L 2And filter capacitor C oConstitute.
Wherein, the first input dividing potential drop electric capacity C Dc1Anode connect positive output end, first power switch pipe of solar cell respectively S 1Drain electrode, the 7th power switch pipe S 7Drain electrode, the first input dividing potential drop electric capacity C Dc1Negative terminal connect the second input dividing potential drop electric capacity respectively C Dc2Anode, the 6th power switch pipe S 6Drain electrode, the second dividing potential drop electric capacity C Dc2Negative terminal connect negative output terminal, the 3rd power switch pipe of solar cell respectively S 3Source electrode, the 5th power switch pipe S 5Source electrode, first power switch pipe S 1Source electrode connect second power switch pipe respectively S 2Collector electrode, the 4th power switch pipe S 4Collector electrode, the 6th power switch pipe S 6Drain electrode, second power switch pipe S 2Emitter connect the 3rd power switch pipe respectively S 3Drain electrode, first filter inductance L 1An end, the 4th power switch pipe S 4Emitter connect the 5th power switch pipe respectively SDrain electrode, the 7th power switch pipe S 7Source electrode, second filter inductance L 2An end, first filter inductance L 1The other end connect filter capacitor respectively C oAn end, electrical network v gAn end, second filter inductance L 2The other end connect filter capacitor respectively 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 two, and its circuit is formed identical with accompanying drawing 8 illustrated embodiments one, but the 7th power switch pipe S 7Source electrode connect second power switch pipe respectively S 2Emitter, the 3rd power switch pipe S 3Drain electrode, first filter inductance L 1An end.
Accompanying drawing 10 is that minion is closed non-isolated grid-connected inverter circuit topology embodiment three, and its circuit is formed identical with accompanying drawing 8 illustrated embodiments one, but circuit connecting relation is the first input dividing potential drop electric capacity C Dc1Anode connect positive output end, the 3rd power switch pipe of solar cell respectively S 3Drain electrode, the 5th power switch pipe S 5Drain electrode, the first input dividing potential drop electric capacity C Dc1Negative terminal connect the second input dividing potential drop electric capacity respectively C Dc2Anode, the 6th power switch pipe S 6Drain electrode, the second input dividing potential drop electric capacity C Dc2Negative terminal connect first power switch pipe respectively S 1Source electrode, the 7th power switch pipe S 7Source electrode, first power switch pipe S 1Drain electrode connect second power switch pipe respectively S 2Emitter, the 4th power switch pipe S 4Emitter, the 6th power switch pipe S 6Source electrode, second power switch pipe S 2Collector electrode connect the 3rd power switch pipe respectively S 3Source electrode, first filter inductance L 1An end, the 4th power switch pipe S 4Collector electrode connect the 5th power switch pipe respectively S 5Source electrode, the 7th power switch pipe S 7Drain electrode, second filter inductance L 2An end, first filter inductance L 1The other end connect filter capacitor respectively C oAn end, electrical network v gAn end, second filter inductance L 2The other end connect filter capacitor respectively 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 four, and its circuit is formed identical with accompanying drawing 10 illustrated embodiments three, but the 7th power switch pipe S 7Drain electrode connect second power switch pipe respectively S 2Collector electrode, the 3rd power switch pipe S 3Source electrode, first filter inductance L 1An end.
Accompanying drawing 12 is drive principle work waves that minion is closed non-isolated grid-connected inverter circuit topology embodiment one, first power switch pipe S 1With the 3rd power switch pipe S 3Drive 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 pipe S 2Straight-through at the positive half cycle of network access electric current, the negative half period and first power switch pipe S 1Drive signal is complementary, and adds Dead Time; The 5th power switch pipe S 5With the 7th power switch pipe S 7Drive 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 4th power switch pipe S 4At positive half cycle of network access electric current and the 5th power switch pipe S 5Drive signal is complementary, and adds Dead Time, and negative half period is straight-through; The 6th power switch pipe S 6At positive half cycle of network access electric current and the 5th power switch pipe S 5Drive signal is complementary, and adds Dead Time, negative half period and first power switch pipe S 1Drive signal is complementary, and adds Dead Time; Work as modulation signal v eGreater than the triangular carrier signal v StThe time, drive signal is a high level, otherwise is low level.
Accompanying drawing 13 is each switch mode equivalent circuit diagram that minion is closed non-isolated grid-connected inverter circuit topology embodiment one.
Mode 1: equivalent electric circuit shown in Figure 13 (a), first, second, the 5th power switch pipe conducting, other power switch pipe turn-offs, the network access electric current flows through first power switch pipe successively S 1, the 3rd power switch pipe S 3, first filter inductance L 1, electrical network v g, second filter inductance L 2, the 5th power switch pipe S 5
Mode 2: equivalent electric circuit shown in Figure 13 (b), the second, the 4th, the 6th power switch pipe conducting, other power switch pipe turn-offs, by second power switch pipe S 2With the 4th power switch pipe S 4Body diode constitute continuous current circuit, and by the mid point of first, second dividing potential drop electric capacity through the 6th power switch pipe S 6The continuous current circuit current potential is clamped at cell voltage U PVHalf the;
Mode 3: equivalent electric circuit 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 pipe S 4Drive signal is arranged, but do not have electric current to flow through, the network access electric current flows through the 7th power switch pipe successively S 7, second filter inductance L 2, electrical network v g, first filter inductance L 1, the 3rd power switch pipe S 3
Mode 4: equivalent electric circuit shown in Figure 13 (d), the second, four, the 6th power switch pipe conducting, other power switch pipe turn-offs, by second power switch pipe S 2Body diode and the 4th power switch pipe S 4Constitute continuous current circuit, and pass through the 6th power switch pipe by the mid point of first, second dividing potential drop electric capacity S 6The continuous current circuit current potential is clamped at cell voltage U PVHalf the;
It is thus clear that regardless of the network access sense of current, in the afterflow stage, the continuous current circuit current potential is clamped at battery all the time U PVHalf the.

Claims (8)

1. non-isolated grid-connected inverter; Its input is connected with solar cell; Output is connected with electrical network, it is characterized in that: said 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) comprise input capacitance ( C Dc);
Full-bridge switch unit (2) comprise first power switch pipe ( S 1), 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) comprise first filter inductance ( L 1), second filter inductance ( L 2), filter capacitor ( C o);
Input capacitance ( C Dc) anode connect respectively solar cell positive output end, 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; First power switch pipe ( S 1) source electrode connect respectively second power switch pipe ( S 2) collector electrode, the 4th power switch pipe ( S 4) collector electrode; Second power switch pipe ( S 2) emitter connect respectively the 3rd power switch pipe ( S 3) drain electrode, first filter inductance ( L 1) an end, the 4th power switch pipe ( S 4) emitter connect respectively the 5th power switch pipe ( S 5) drain electrode, the 6th power switch pipe ( S 6) source electrode, second filter inductance ( L 2) an end, first filter inductance ( L 1) the other end connect respectively filter capacitor ( C o) an end, electrical network ( v g) an end, second filter inductance ( L 2) the other end connect respectively filter capacitor ( C o) the other end, electrical network ( v g) the other end.
2. non-isolated grid-connected inverter; Its input is connected with solar cell; Output is connected with electrical network, it is characterized in that: said 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) comprise input capacitance ( C Dc);
Full-bridge switch unit (2) comprise first power switch pipe ( S 1), 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) comprise first filter inductance ( L 1), second filter inductance ( L 2), filter capacitor ( C o);
Input capacitance ( C Dc) anode connect respectively solar cell positive output end, 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; First power switch pipe ( S 1) source electrode connect respectively second power switch pipe ( S 2) collector electrode, the 4th power switch pipe ( S 4) collector electrode; 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, first filter inductance ( L 1) an end, the 4th power switch pipe ( S 4) emitter connect respectively the 5th power switch pipe ( S 5) drain electrode, second filter inductance ( L 2) an end, first filter inductance ( L 1) the other end connect respectively filter capacitor ( C o) an end, electrical network ( v g) an end, 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. non-isolated grid-connected inverter; Its input is connected with solar cell; Output is connected with electrical network, it is characterized in that: said 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) comprise input capacitance ( C Dc);
Full-bridge switch unit (2) comprise first power switch pipe ( S 1), 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) comprise first filter inductance ( L 1), second filter inductance ( L 2), filter capacitor ( C o);
Input capacitance ( C Dc) anode connect respectively solar cell positive output end, second power switch pipe ( S 2) drain electrode, the 4th power switch pipe ( S 4) drain electrode, input capacitance ( C Dc) negative terminal connect respectively solar cell negative output terminal, first power switch pipe ( S 1) source electrode, the 6th power switch pipe ( S 6) source electrode, first power switch pipe ( S 1) drain electrode connect respectively the 3rd power switch pipe ( S 3) emitter, the 5th power switch pipe ( S 5) emitter, second power switch pipe ( S 2) source electrode connect respectively the 3rd power switch pipe ( S 3) collector electrode, first filter inductance ( L 1) an end, the 4th power switch pipe ( S 4) source electrode connect respectively the 5th power switch pipe ( S 5) collector electrode, the 6th power switch pipe ( S 6) drain electrode, second filter inductance ( L 2) an end, first filter inductance ( L 1) the other end connect respectively filter capacitor ( C o) an end, electrical network ( v g) an end, 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. non-isolated grid-connected inverter; Its input is connected with solar cell; Output is connected with electrical network, it is characterized in that: said 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) comprise input capacitance ( C Dc);
Full-bridge switch unit (2) comprise first power switch pipe ( S 1), 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) comprise first filter inductance ( L 1), second filter inductance ( L 2), filter capacitor ( C o);
Input capacitance ( C Dc) anode connect respectively solar cell positive output end, second power switch pipe ( S 2) drain electrode, the 4th power switch pipe ( S 4) drain electrode, input capacitance ( C Dc) negative terminal connect respectively solar cell negative output terminal, first power switch pipe ( S 1) source electrode, the 6th power switch pipe ( S 6) source electrode, first power switch pipe ( S 1) drain electrode connect respectively the 3rd power switch pipe ( S 3) emitter, the 5th power switch pipe ( S 5) emitter, second power switch pipe ( S 2) source electrode connect respectively the 3rd power switch pipe ( S 3) collector electrode, the 6th power switch pipe ( S 6) drain electrode, first filter inductance ( L 1) an end, the 4th power switch pipe ( S 4) source electrode connect respectively the 5th power switch pipe ( S 5) collector electrode, second filter inductance ( L 2) an end, first filter inductance ( L 1) the other end connect respectively filter capacitor ( C o) an end, electrical network ( v g) an end, 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. non-isolated grid-connected inverter; Its input is connected with solar cell; Output is connected with electrical network, it is characterized in that: said 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) comprise 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) comprise first power switch pipe ( S 1), 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) comprise first filter inductance ( L 1), second filter inductance ( L 2), filter capacitor ( C o);
The first input dividing potential drop electric capacity ( C Dc1) anode connect respectively solar cell positive output end, first power switch pipe ( S 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 solar cell negative output terminal, the 3rd power switch pipe ( S 3) source electrode, the 5th power switch pipe ( S 5) source electrode, first power switch pipe ( S 1) source electrode connect respectively 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, second power switch pipe ( S 2) emitter connect respectively the 3rd power switch pipe ( S 3) drain electrode, first filter inductance ( L 1) an 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, second filter inductance ( L 2) an end, first filter inductance ( L 1) the other end connect respectively filter capacitor ( C o) an end, electrical network ( v g) an end, second filter inductance ( L 2) the other end connect respectively filter capacitor ( C o) the other end, electrical network ( v g) the other end.
6. non-isolated grid-connected inverter; Its input is connected with solar cell; Output is connected with electrical network, it is characterized in that: said 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) comprise 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) comprise first power switch pipe ( S 1), 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) comprise first filter inductance ( L 1), second filter inductance ( L 2), filter capacitor ( C o);
The first input dividing potential drop electric capacity ( C Dc1) anode connect respectively solar cell positive output end, first power switch pipe ( S 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 solar cell negative output terminal, the 3rd power switch pipe ( S 3) source electrode, the 5th power switch pipe ( S 5) source electrode, first power switch pipe ( S 1) source electrode connect respectively 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, 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, first filter inductance ( L 1) an end, the 4th power switch pipe ( S 4) emitter connect respectively the 5th power switch pipe ( S 5) drain electrode, second filter inductance ( L 2) an end, first filter inductance ( L 1) the other end connect respectively filter capacitor ( C o) an end, electrical network ( v g) an end, second filter inductance ( L 2) the other end connect respectively filter capacitor ( C o) the other end, electrical network ( v g) the other end.
7. non-isolated grid-connected inverter; Its input is connected with solar cell; Output is connected with electrical network, it is characterized in that: said 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) comprise 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) comprise first power switch pipe ( S 1), 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) comprise first filter inductance ( L 1), second filter inductance ( L 2), filter capacitor ( C o);
The first input dividing potential drop electric capacity ( C Dc1) anode connect respectively solar cell positive output end, the 3rd power switch pipe ( S 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 solar cell negative output terminal, first power switch pipe ( S 1) source electrode, the 7th power switch pipe ( S 7) source electrode, first power switch pipe ( S 1) drain electrode connect respectively second power switch pipe ( S 2) emitter, the 4th power switch pipe ( S 4) emitter, the 6th power switch pipe ( S 6) source electrode, second power switch pipe ( S 2) collector electrode connect respectively the 3rd power switch pipe ( S 3) source electrode, first filter inductance ( L 1) an 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, second filter inductance ( L 2) an end, first filter inductance ( L 1) the other end connect respectively filter capacitor ( C o) an end, electrical network ( v g) an end, second filter inductance ( L 2) the other end connect respectively filter capacitor ( C o) the other end, electrical network ( v g) the other end.
8. non-isolated grid-connected inverter; Its input is connected with solar cell; Output is connected with electrical network, it is characterized in that: said 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) comprise 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) comprise first power switch pipe ( S 1), 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) comprise first filter inductance ( L 1), second filter inductance ( L 2), filter capacitor ( C o);
The first input dividing potential drop electric capacity ( C Dc1) anode connect respectively solar cell positive output end, the 3rd power switch pipe ( S 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 solar cell negative output terminal, first power switch pipe ( S 1) source electrode, the 7th power switch pipe ( S 7) source electrode, first power switch pipe ( S 1) drain electrode connect respectively second power switch pipe ( S 2) emitter, the 4th power switch pipe ( S 4) emitter, the 6th power switch pipe ( S 6) source electrode, 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, first filter inductance ( L 1) an end, the 4th power switch pipe ( S 4) collector electrode connect respectively the 5th power switch pipe ( S 5) source electrode, second filter inductance ( L 2) an end, first filter inductance ( L 1) the other end connect respectively filter capacitor ( C o) an end, electrical network ( v g) an end, second filter inductance ( L 2) the other end connect respectively filter capacitor ( C o) the other end, electrical network ( v g) the other end.
CN201110062668.5A 2011-03-16 2011-03-16 Non-isolating photovoltaic grid-connected inverter Expired - Fee Related CN102684218B (en)

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