CN109245588A - A kind of novel single-phase non-isolated active clamp gird-connected inverter - Google Patents
A kind of novel single-phase non-isolated active clamp gird-connected inverter Download PDFInfo
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- CN109245588A CN109245588A CN201811163538.9A CN201811163538A CN109245588A CN 109245588 A CN109245588 A CN 109245588A CN 201811163538 A CN201811163538 A CN 201811163538A CN 109245588 A CN109245588 A CN 109245588A
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- switching tube
- diode
- capacitor
- switch
- gird
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- 239000003990 capacitor Substances 0.000 claims abstract description 23
- 230000005764 inhibitory process Effects 0.000 abstract description 4
- 238000011084 recovery Methods 0.000 abstract description 2
- 230000005611 electricity Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 2
- 230000003071 parasitic effect Effects 0.000 description 2
- 210000000080 chela (arthropods) Anatomy 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000000844 transformation Methods 0.000 description 1
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
-
- H02J3/383—
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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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
The present invention provides a kind of novel single-phase non-isolated active clamp gird-connected inverter, including eight switching tubes, two diodes and two split capacitors.In freewheeling period, clamp switch work can be such that common-mode voltage keeps constant, be suitable for photovoltaic parallel in system.Circuit of the present invention can in effective solution inversion link as do not use transformer and caused by common mode current leakage, simultaneously because freewheeling period electric current is not passed through body diode, therefore MOSFET element can be used, reduce the turn-off power loss as caused by tail currents when as IGBT device shutdown, and SiC diode can substitute general-purpose diode, the available good inhibition of the loss of Reverse recovery.Therefore circuit of the present invention can effectively inhibit common mode leakage current, while improve the efficiency of grid-connected system.
Description
Technical field
The present invention relates to photovoltaic combining inverter fields, and in particular to a kind of novel single-phase non-isolated active clamp is grid-connected
Inverter.
Background technique
Solar energy cleanliness without any pollution is very important a kind of new energy.Due to the incident photon-to-electron conversion efficiency of photovoltaic solar plate
It is lower, therefore the efficiency for improving photovoltaic combining inverter is particularly important.The common gird-connected inverter with Industrial Frequency Transformer,
Since the presence meeting of transformer is so that the efficiency of system reduces, and increases the price of inverter, simultaneously because Industrial Frequency Transformer
Volume is larger, it is difficult to install.And the grid-connected system with high frequency transformer, one-stage transfor-mation device is increased, efficiency is also difficult to mention
It rises.Therefore to improve system effectiveness, generally use transformerless gird-connected inverter, due to transless so that power grid with it is inverse
Become device and there is direct electrical connection, when, there are when distribution capacity, full-bridge inverter can generate larger between solar panels and ground
Common mode leakage current, harm is generated to human body, and inverter may be damaged.Therefore to the research of non-isolation type inverter topology by
Extensive concern is arrived.The H5 type topology of German SMA company, can efficiently solve current leakage, but due to freewheeling period
Electric current flows through body diode, therefore HF switch pipe uses IGBT, IGBT to will cause biggish since there are tail currents
Turn-off power loss, the used time due to being pressed by the parasitic capacitance of device, due to device parameters and the difference of pcb board parasitic parameter
Can make that leakage current effect is inhibited to be deteriorated with resonant tank that may be present.
Summary of the invention
It is an object of the invention to overcome above-mentioned the deficiencies in the prior art, a kind of novel single-phase non-isolated active pincers are proposed
Position gird-connected inverter.
The novel single-phase non-isolated active clamp gird-connected inverter of one kind provided by the invention, specifically includes first switch
Pipe, second switch, third switching tube, the 4th switching tube, the 5th switching tube, the 6th switching tube, the 7th switching tube, the 8th switch
Pipe, first diode, the second diode, the first inductance, the second inductance, first capacitor, the second capacitor.
The specific connection type of circuit of the present invention are as follows: the anode of DC bus and one end, the first switch tube of first capacitor
Drain electrode connected with the drain electrode of third switching tube.The source of one end and the 7th switching tube of the other end of first capacitor and the second capacitor
Pole connection.The source electrode of the other end of the cathode of DC bus and the second capacitor, the source electrode of second switch and the 4th switching tube connects
It connects.The drain electrode of 7th switching tube is connect with the drain electrode of the 8th switching tube.The source electrode of first switch tube and the cathode of first diode
It is connected with the drain electrode of the 6th switching tube.The source electrode of the anode of first diode and the 5th switching tube, second switch drain electrode and
One end of second inductance connects.The other end of second inductance is connect with power grid one end.The source electrode of third switching tube and the two or two pole
The drain electrode of the cathode of pipe and the 5th switching tube connects.The source electrode of the anode of second diode and the 6th switching tube, the first inductance
One end is connected with the drain electrode of the 4th switching tube.The other end of first inductance is connected with the other end of power grid.
Further, the switching tube is all made of the enhanced MOSFET of N-channel.
Further, the 7th switching tube and the 8th switching tube constitute two-way switch, play clamping action, do not transmit high-power.
Further, first capacitor and the second capacitor's capacity are equal.
Compared with prior art, circuit of the present invention has the advantage that are as follows: can in effective solution inversion link due to not
Common mode current leakage caused by using transformer, simultaneously because freewheeling period electric current is not passed through body diode, therefore
MOSFET element can be used, and reduce the turn-off power loss as caused by tail currents when as IGBT device shutdown, and SiC bis-
Pole pipe can substitute general-purpose diode, the available good inhibition of the loss of Reverse recovery.Circuit of the present invention can be effective
Inhibit common mode leakage current, while improving the efficiency of grid-connected system.
Detailed description of the invention
Fig. 1 is a kind of novel single-phase non-isolated active clamp gird-connected inverter topological diagram.
Fig. 2 a~2d is circuit modal graph in network voltage positive-negative half-cycle (wherein with respect to Fig. 1 component lacked and connecting line
For off state).
Fig. 3 is switching tube S in embodiment1-S6Drive signal waveform.
Specific embodiment
Specific implementation of the invention is described further below in conjunction with attached drawing and example, but protection scope of the present invention is not
It is limited to this.If being that those skilled in the art can refer to it is noted that having the process or symbol of not special detailed description below
The prior art understand or realize.
For Basic Topological of the invention as shown in Figure 1, for easy analysis, the device in circuit structure is accordingly to be regarded as ideal
Device.
The novel single-phase non-isolated active clamp gird-connected inverter of one kind provided by the invention, specifically includes first switch tube
S1, second switch S2, third switching tube S3, the 4th switching tube S4, the 5th switching tube S5, the 6th switching tube S6, the 7th switching tube
S7, the 8th switching tube S8, first diode VD1, the second diode VD2, the first inductance L1, the second inductance L2, first capacitor Cdc1、
Second capacitor Cdc2, anode and the first capacitor C of DC busdc1One end, first switch tube S1Drain electrode and third switching tube S3
Drain electrode connection.First capacitor Cdc1The other end and the second capacitor Cdc2One end and the 7th switching tube S7Source electrode connection.Directly
Flow the cathode and the second capacitor C of busdc2The other end, second switch S2Source electrode and the 4th switching tube S4Source electrode connection.
7th switching tube S7Drain electrode and the 8th switching tube S8Drain electrode connection.First switch tube S1Source electrode and first diode VD1's
Cathode and the 6th switching tube S6Drain electrode connection.First diode VD1Anode and the 5th switching tube S5Source electrode, second switch
Pipe S2Drain electrode and the second inductance L2One end connection.Second inductance L2The other end connect with power grid one end.Third switching tube S3
Source electrode and the second diode VD2Cathode and the 5th switching tube S5Drain electrode connection.Second diode VD2Anode and the 6th
Switching tube S6Source electrode, the first inductance L1One end and the 4th switching tube S4Drain electrode connection.First inductance L1The other end and electricity
The other end of net is connected.PVCell indicates photovoltaic cell in figure.
Fig. 2 a~2d is circuit modal graph in network voltage positive-negative half-cycle, in order to enable circuit expression is more clear, wherein
The component and connecting line that opposite Fig. 1 lacks are off state.
(1) in the positive half cycle of network voltage, circuit is as shown in Figure 2 a in the modal graph in this stage, first switch tube S1With
Two switching tube S2It simultaneously turns on, the 6th switching tube S6Conducting, grid-connected current flow through first switch tube S1, the 6th switching tube S6, first
Inductance L1, power grid, the second inductance L2, second switch S2It powers to power grid, bridge arm output voltage is UAB=+UDC.Bridge arm exports A
Point is U to the voltage of DC bus negative terminal NAN=UDC, it is U to the voltage of DC bus negative terminal N that bridge arm, which exports B point,BN=0, so
(2) freewheeling period, circuit is as shown in Figure 2 b in the modal graph in this stage, first switch tube S1Conducting and second switch
Pipe S2It simultaneously turns off, the 6th switching tube S6With first diode VD1Conducting, the 7th switching tube S7With the 8th switching tube S8It leads simultaneously
It is logical.Electric current flows through the first inductance L1, power grid, the second inductance L2, first diode VD1, the 6th switching tube S6Afterflow, bridge arm output
Voltage is UAB=0.Due to the 7th switching tube S7With the 8th switching tube S8Conducting, bridge arm export A point to the electricity of DC bus negative terminal N
Pressure is UAN=0.5UDC, it is U to the voltage of DC bus negative terminal N that bridge arm, which exports B point,BN=0.5UDC, so
(3) in the negative half period of network voltage, circuit is as shown in Figure 2 c in the modal graph in this stage, third switching tube S3 and
Four switching tube S4It simultaneously turns on, the 5th switching tube S5Conducting, grid-connected current flow through third switching tube S3, the 5th switching tube S5, second
Inductance L2, power grid, the first inductance L1, the 4th switching tube S4It powers to power grid, bridge arm output voltage is UAB=-UDC.Bridge arm exports A
Point is U to the voltage of DC bus negative terminal NAN=0, it is U to the voltage of DC bus negative terminal N that bridge arm, which exports B point,BN=UDC, so
(4) freewheeling period, circuit is as shown in Figure 2 d in the modal graph in this stage, third switching tube S3 and the 4th switching tube S4
It simultaneously turns off, the 5th switching tube S5With the second diode VD2Conducting, the 7th switching tube S7With the 8th switching tube S8It simultaneously turns on.Electricity
Stream flows through the second inductance L2, power grid, the first inductance L1, the 5th switching tube S5, the second diode VD2Afterflow, bridge arm output voltage are
UAB=0.Due to the 7th switching tube S7With the 8th switching tube S8Conducting, it is U to the voltage of DC bus negative terminal N that bridge arm, which exports A point,AN
=0.5UDC, it is U to the voltage of DC bus negative terminal N that bridge arm, which exports B point,BN=0.5UDC, so
As the above analysis, common-mode voltage Ucm=0.5UDCIt keeps constant.Therefore, common mode leakage current can obtain very well
Inhibition.Simultaneously because freewheeling period electric current is not passed through body diode, therefore MOSFET element can be used, reduce due to
The turn-off power loss as caused by tail currents when IGBT device turns off, and SiC diode can substitute general-purpose diode, it is reversed extensive
The available good inhibition of multiple loss.Therefore circuit of the present invention can effectively inhibit common mode leakage current, while improve simultaneously
The efficiency of net electricity generation system.
Claims (5)
1. a kind of novel single-phase non-isolated active clamp gird-connected inverter, including first switch tube (S1), second switch
(S2), third switching tube (S3), the 4th switching tube (S4), the 5th switching tube (S5), the 6th switching tube (S6), the 7th switching tube
(S7), the 8th switching tube (S8), first diode (VD1), the second diode (VD2), the first inductance (L1), the second inductance (L2),
First capacitor (Cdc1) and the second capacitor (Cdc2).
2. a kind of novel single-phase non-isolated active clamp gird-connected inverter according to claim 1, it is characterised in that: direct current
Anode and the first capacitor (C of busdc1) one end, first switch tube (S1) drain electrode and third switching tube (S3) drain electrode connect
It connects；First capacitor(Cdc1) the other end and the second capacitor (Cdc2) one end and the 7th switching tube (S7) source electrode connection；Direct current
The cathode of bus and the second capacitor (Cdc2) the other end, second switch (S2) source electrode and the 4th switching tube (S4) source electrode connect
It connects；7th switching tube (S7) drain electrode and the 8th switching tube (S8) drain electrode connection；First switch tube (S1) source electrode and the one or two
Pole pipe (VD1) cathode and the 6th switching tube (S6) drain electrode connection；First diode (VD1) anode and the 5th switching tube
(S5) source electrode, second switch (S2) drain electrode and the second inductance (L2) one end connection；Second inductance (L2) the other end with
The connection of power grid one end；Third switching tube (S3) source electrode and the second diode (VD2) cathode and the 5th switching tube (S5) drain electrode
Connection；Second diode (VD2) anode and the 6th switching tube (S6) source electrode, the first inductance (L1) one end and the 4th switch
Manage (S4) drain electrode connection；First inductance (L1) the other end be connected with the other end of power grid.
3. the novel single-phase non-isolated active clamp gird-connected inverter of one kind according to claim 2, it is characterised in that: institute
It states switching tube and is all made of the enhanced MOSFET of N-channel.
4. the novel single-phase non-isolated active clamp gird-connected inverter of one kind according to claim 2, it is characterised in that: the
Seven switching tube (S7) and the 8th switching tube (S8) two-way switch is constituted, clamping action is played, is not transmitted high-power.
5. the novel single-phase non-isolated active clamp gird-connected inverter of one kind according to claim 2, it is characterised in that: the
One capacitor (Cdc1) and the second capacitor (Cdc2) capacitance is equal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811163538.9A CN109245588A (en) | 2018-09-30 | 2018-09-30 | A kind of novel single-phase non-isolated active clamp gird-connected inverter |
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| CN201811163538.9A CN109245588A (en) | 2018-09-30 | 2018-09-30 | A kind of novel single-phase non-isolated active clamp gird-connected inverter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110061650A (en) * | 2019-05-17 | 2019-07-26 | 南京航空航天大学 | The two-way AC/DC converter of single stage type isolated form three-phase and control method |
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| CN110061650A (en) * | 2019-05-17 | 2019-07-26 | 南京航空航天大学 | The two-way AC/DC converter of single stage type isolated form three-phase and control method |
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Application publication date: 20190118 |