CN205622539U - Single -phase photovoltaic grid -connected inverter of non - isolation - Google Patents
Single -phase photovoltaic grid -connected inverter of non - isolation Download PDFInfo
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- CN205622539U CN205622539U CN201620380582.5U CN201620380582U CN205622539U CN 205622539 U CN205622539 U CN 205622539U CN 201620380582 U CN201620380582 U CN 201620380582U CN 205622539 U CN205622539 U CN 205622539U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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Abstract
The utility model relates to a single -phase photovoltaic grid -connected inverter of non - isolation, including H bridge circuit, the direct current of H bridge circuit side is connected with two voltage -dividing capacitor of series connection, and the interchange side of H bridge circuit is connected with the afterflow branch road, and two reverse switch tubes of connecting of an afterflow route constitute, are connected with the clamp branch road between the tie point of two reverse switch tubes of connecting and two voltage -dividing capacitor's the tie point, and clamp switch tube of a clamp route constitutes, and the clamp switch tube just can be with the half of afterflow voltage clamp to solar cell voltage. Detach the switch tube in the full -bridge, only need increase the function that the non - isolation photovoltaic grid -connected inverter among the prior art can be realized to three switch tube in addition, reduced by a switch tube than the dc -to -ac converter among the prior art, reduce switching on loss and input cost.
Description
Technical field
This utility model relates to a kind of non-isolated single-phase photovoltaic grid-connected inverter, belongs to parallel network reverse topologies
Field.
Background technology
Non-isolated photovoltaic grid-connected inverter requires efficiency height, low cost, it is possible to bear photovoltaic cell output
Great fluctuation process voltage meets the quality of power supply of Standard with exchanging output.But due to inverter do not have transformator every
From so that the switching device high frequency mo of inverter produces leakage current by system parasitic electric capacity, and this can be made
Becoming EMC interference to increase the weight of, leakage current is excessive even can be damaged equipment and the person.
Unipolarity modulator approach is to use more modulator approach in current single-phase photovoltaic inverter, and it has directly
The advantages such as stream voltage utilization is high, filter inductance pulsation of current is little.But can produce bigger when switch motion
Common-mode voltage, in order to effectively suppress common-mode voltage, the Chinese patent Shen of Application No. 201120403241.2
In please, at two switching tubes of AC bridge mouth differential concatenation, provide for the afterflow of electric current during brachium pontis switch OFF
One path, simultaneously by the opening by two other differential concatenation of the current potential during the afterflow of the two switching tube
Close the junction point being clamped to two dc-link capacitances, thus effectively inhibit common-mode voltage, such as Fig. 1 institute
Show.But it is compared single-phase full bridge and adds 4 switching tubes, brings higher cost, too increase and be
System loss.
Utility model content
The purpose of this utility model is to provide a kind of non-isolated single-phase photovoltaic grid-connected inverter, in order to solve tradition
The problem adding the higher cost that 4 switching tubes cause in single-phase photovoltaic inverter.
For achieving the above object, scheme of the present utility model includes a kind of single-phase photovoltaic grid-connected inversion of non-isolated
Device, including H-bridge circuit, the DC side of H-bridge circuit connects two derided capacitors having series connection, H-bridge circuit
AC connect have afterflow branch road, afterflow prop up route two Opposite direction connections switching tube constitute, said two
It is connected between the junction point of the switching tube of Opposite direction connection and the junction point of said two derided capacitors and has clamp
Road, described clamp props up one clamp switch pipe of route and constitutes.
The switching tube common-anode of said two Opposite direction connection connects, and the anode of described clamp switch pipe connects described
The junction point of the switching tube of two Opposite direction connections.
The switching tube common cathode of said two Opposite direction connection connects, and the negative electrode of described clamp switch pipe connects described
The junction point of the switching tube of two Opposite direction connections.
Described switching tube is IGBT and/or MOSFET, and when switching tube is IGBT, the anode of switching tube is
The colelctor electrode of IGBT, the negative electrode of switching tube is the emitter stage of IGBT；When switching tube is MOSFET, switch
The anode of pipe is the drain electrode of MOSFET, and the negative electrode of switching tube is the source electrode of MOSFET.
Each one diode of the equal reverse parallel connection of described switching tube.
In the non-isolated single-phase photovoltaic grid-connected inverter that this utility model provides, the switching tube for afterflow is two
Individual, it is possible to achieve during freewheeling period, continuous current circuit current potential is in the cell voltage of 1/2nd and suppresses electric leakage
Stream, and ensure that power transmission stage output electric current flows only through this two switching tubes, effectively reduce conducting and damage
Consumption, and for the switching tube only one of which of clamp, this only switching tube just can be by afterflow voltage
Clamp is to 1/2nd of solar array voltage.It is to say, the non-isolated that this utility model provides is single-phase
In photovoltaic combining inverter, removing the switching tube in full-bridge, only need to additionally increase by three switching tubes can realize
The function of inverter of the prior art, inverter more of the prior art decreases a switching tube, enters one
Step reduces conduction loss and input cost.
Accompanying drawing explanation
Fig. 1 is the structural representation of existing non-isolated grid-connected inverter；
Fig. 2 is the structural representation of the non-isolated single-phase photovoltaic grid-connected inverter that this utility model provides；
Fig. 3 is that switching tube drives signal schematic representation；
When Fig. 4-1 is line voltage positive half cycle, and switching tube S1, S4 conducting, when switching tube S2, S3 turn off
The operation mode figure of combining inverter；
When Fig. 4-2 is line voltage positive half cycle, and parallel network reverse when switching tube S1, S2, S3, S4 turn off
The operation mode figure of device；
When Fig. 4-3 is line voltage negative half period, and switching tube S2, S3 conducting, when switching tube S1, S4 turn off
The operation mode figure of combining inverter；
When Fig. 4-4 is line voltage negative half period, and parallel network reverse when switching tube S1, S2, S3, S4 turn off
The operation mode figure of device；
Fig. 5 is the structural representation of the another kind of non-isolated single-phase photovoltaic grid-connected inverter that this utility model provides
Figure；
Dotted line switching tube in Fig. 4-1 to 4-4 is expressed as the switching tube being not turned on.
Detailed description of the invention
The utility model is described in more detail below in conjunction with the accompanying drawings.
Non-isolated single-phase photovoltaic grid-connected inverter as shown in Figure 2, including derided capacitors branch road, clamp branch road,
Full bridge unit and afterflow branch road, the both positive and negative polarity outfan correspondence of solaode connect have positive DC bus and
Negative DC bus, derided capacitors branch road is connected between the both positive and negative polarity dc bus of full bridge unit.
Be serially connected with electric capacity Cdc1 and electric capacity Cdc2 on derided capacitors branch road, full bridge unit by switching tube S1, open
Close pipe S2, switching tube S3 and switching tube S4 composition, the anode of switching tube S1 and the anode of switching tube S3 connect
Connecing positive DC bus, the negative electrode of switching tube S2 and the negative electrode of switching tube S4 connect negative DC bus.Continuous
Stream route switching tube S5 and switching tube S6 composition, the negative electrode of the negative electrode connecting valve pipe S1 of switching tube S5,
The anode of the negative electrode connecting valve pipe S4 of switching tube S6, switching tube S5 and switching tube S6 common-anode connect,
It is connected pincers between the junction point of switching tube S5 and switching tube S6 and the junction point of electric capacity Cdc1 and electric capacity Cdc2
Position branch road, clamp branch road concatenates anode connecting valve pipe S5 and the switching tube of switching tube S7, switching tube S7
The junction point of S6, the negative electrode of switching tube S7 connects electric capacity Cdc1 and the junction point of electric capacity Cdc2.
The negative electrode of switching tube S5 is also connected with one end of network access wave filter L1, the other end of network access wave filter L1
Connect electrical network；The anode of switching tube S6 is also connected with one end of network access wave filter L2, network access wave filter L2's
The other end also connects electrical network.
Assume that grid-connected voltage and current phase place is identical, as it is shown on figure 3, open during line voltage just half power frequency period
Close pipe S1 and S4 with switching frequency action simultaneously, switching tube S5, S6 and S7 and switching tube S1 and S4
Complementary duty, switching tube S2 and S3 is off state.During voltage negative half power frequency period switching tube S2 and
S3 with switching frequency simultaneously action, switching tube S5, S6 and S7 and switching tube S2 and S3 complementary duty,
Switching tube S1 and S4 is off state.
At the positive half cycle of line voltage:
When switching tube S1, S4 open, switching tube S5, S6, S7 turn off, and electric current is opened through passing through from positive bus-bar
Close pipe S1, network access wave filter L1, electrical network and filter capacitor C, network access wave filter L2, switching tube S4 to return
To negative busbar, as shown in Fig. 4-1.
When switching tube S1, S4 turn off, switching tube S5, S6, S7 are open-minded, and inductive current filters through network access
Device L1, electrical network and filter capacitor C, network access wave filter L2, the anti-paralleled diode of switching tube S6, switch
Pipe S5 afterflow.It addition, when C point voltage is higher than O point, switching tube S7 flows through electric current；When C point electricity
Forcing down when O point, the anti-paralleled diode of switching tube S7 flows through electric current.Anti-with it by switching tube S7
The effect of diode in parallel, all the time by C point voltage clamper in O point, as shown in the Fig. 4-2.
Particularly, S5, S6 can also carry out switch motion with power frequency, and when electrical network positive half cycle, S5 is open-minded,
S6 turns off.When electrical network zero crossing, S5 time delayed turn-off, S6 is the most open-minded.
Line voltage negative half period:
When switching tube S2, S3 open, switching tube S5, S6, S7 turn off, and electric current is opened through passing through from positive bus-bar
Close pipe S3, network access wave filter L2, electrical network and filter capacitor C, network access wave filter L1, switching tube S2 to return
To negative busbar, as shown in Fig. 4-3.
When switching tube S2, S3 turn off, switching tube S5, S6, S7 are open-minded, and inductive current filters through network access
Device L2, electrical network and filter capacitor C, network access wave filter L1, the anti-paralleled diode of switching tube S5, switch
Pipe S6 afterflow.It addition, when C point voltage is higher than O point, switching tube S7 flows through electric current, when C point electricity
Forcing down when O point, the anti-paralleled diode of switching tube S7 flows through electric current.Anti-with it by switching tube S7
The effect of diode in parallel, all the time by C point voltage clamper in O point, as shown in Fig. 4-4.
Particularly, S5, S6 can also carry out switch motion with power frequency, and when electrical network negative half period, S6 is open-minded,
S5 turns off.When electrical network zero crossing, S6 time delayed turn-off, S5 is the most open-minded.
No matter line voltage is at positive half cycle or negative half period, and switching tube S7 can by afterflow voltage clamp extremely
/ 2nd of solar array voltage.
In this embodiment, switching tube can be IGBT, MOSFET, it is also possible to is other kinds of half control
Type device or wholly-controled device.When switching tube is IGBT, the anode of switching tube is the current collection of IGBT
Pole, the negative electrode of switching tube is the emitter stage of IGBT；When switching tube is MOSFET, the anode of switching tube
For the drain electrode of MOSFET, the negative electrode of switching tube is the source electrode of MOSFET.
It addition, in the non-isolated single-phase photovoltaic grid-connected inverter of this utility model offer, switching tube can be whole
It is a type of switching tube, such as, switching tube is entirely IGBT and MOSFET；In inverter
Switching tube can also be used in mixed way, such as, the switching tube in inverter has IGBT, also MOSFET.
In above-described embodiment, the switching tube common-anode of two Opposite direction connections on afterflow branch road connects, and clamp is opened
Close the junction point of the switching tube of the anode connection the two Opposite direction connection of pipe.As other embodiment, afterflow
The switching tube common cathode of two Opposite direction connections on branch road connects, and it is anti-that the negative electrode of clamp switch pipe connects the two
To the junction point of the switching tube connected, as shown in Figure 5.
It is presented above specific embodiment, but this utility model is not limited to described embodiment.
Basic ideas of the present utility model are above-mentioned basic scheme, for those of ordinary skill in the art, according to
Teaching of the present utility model, designs the model of various deformation, formula, parameter are not required to spend creativeness
Work.The change that in the case of without departing from principle of the present utility model and spirit, embodiment carried out, repair
Change, replace and modification still falls within protection domain of the present utility model.
Claims (5)
1. a non-isolated single-phase photovoltaic grid-connected inverter, including H-bridge circuit, the DC side of H-bridge circuit connects to be had
Two derided capacitors of series connection, the AC of H-bridge circuit connects afterflow branch road, and it is anti-that route two is propped up in afterflow
Constitute to the switching tube connected, the junction point of the switching tube of said two Opposite direction connection and said two dividing potential drop electricity
Connect between the junction point held and have clamp branch road, it is characterised in that described clamp props up one clamp switch of route
Pipe is constituted.
Non-isolated single-phase photovoltaic grid-connected inverter the most according to claim 1, it is characterised in that described two
The switching tube common-anode of individual Opposite direction connection connects, and the anode of described clamp switch pipe connects said two and reversely connects
The junction point of the switching tube connect.
Non-isolated single-phase photovoltaic grid-connected inverter the most according to claim 1, it is characterised in that described two
The switching tube common cathode of individual Opposite direction connection connects, and the negative electrode of described clamp switch pipe connects said two and reversely connects
The junction point of the switching tube connect.
4. according to the non-isolated single-phase photovoltaic grid-connected inverter described in Claims 2 or 3, it is characterised in that institute
Stating switching tube is IGBT and/or MOSFET, and when switching tube is IGBT, the anode of switching tube is IGBT
Colelctor electrode, the negative electrode of switching tube is the emitter stage of IGBT；When switching tube is MOSFET, switching tube
Anode is the drain electrode of MOSFET, and the negative electrode of switching tube is the source electrode of MOSFET.
Non-isolated single-phase photovoltaic grid-connected inverter the most according to claim 1, it is characterised in that Mei Gesuo
State one diode of the equal reverse parallel connection of switching tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620380582.5U CN205622539U (en) | 2016-04-29 | 2016-04-29 | Single -phase photovoltaic grid -connected inverter of non - isolation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620380582.5U CN205622539U (en) | 2016-04-29 | 2016-04-29 | Single -phase photovoltaic grid -connected inverter of non - isolation |
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| CN205622539U true CN205622539U (en) | 2016-10-05 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108566110A (en) * | 2018-02-02 | 2018-09-21 | 山东理工大学 | A kind of active neutral point clamp photovoltaic inverter circuit of T shapes and its control method |
-
2016
- 2016-04-29 CN CN201620380582.5U patent/CN205622539U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108566110A (en) * | 2018-02-02 | 2018-09-21 | 山东理工大学 | A kind of active neutral point clamp photovoltaic inverter circuit of T shapes and its control method |
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