CN110071652A - A kind of low-leakage current five switchs non-isolated single-phase photovoltaic grid-connected inverter and grid-connected system - Google Patents
A kind of low-leakage current five switchs non-isolated single-phase photovoltaic grid-connected inverter and grid-connected system Download PDFInfo
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- CN110071652A CN110071652A CN201910520559.XA CN201910520559A CN110071652A CN 110071652 A CN110071652 A CN 110071652A CN 201910520559 A CN201910520559 A CN 201910520559A CN 110071652 A CN110071652 A CN 110071652A
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- H02J3/383—
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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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
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Abstract
The invention discloses a kind of low-leakage currents five to switch non-isolated single-phase photovoltaic grid-connected inverter and grid-connected system, the inverter includes: power switch tube S 1, S2, S3, S4 and S5, inductance L1 and L2, diode D and filter capacitor C, the wherein anode of the external direct current input source of drain electrode of S1, the source electrode of S1 is connect with the cathode of diode D, the cathode of diode D is also connect with the drain electrode of S2 and the drain electrode of S4 respectively, the source electrode of S2 is connected by the drain electrode of L1 and S5, and the source electrode of S4 is connected by the drain electrode of L2 and S3；The cathode of the positive external direct current input source of the source electrode of S3, the source electrode of S5 and diode D, external AC network/the load of the tie point of the drain electrode of L1 and S5, external AC network/the load of the tie point of the drain electrode of L2 and S3, the both ends filter capacitor C are connect with AC network/load both ends respectively.For the present invention by separating in freewheeling period DC side with exchange side, Ground leakage current is small, and bridge arm direct pass risk is not present.
Description
Technical field
The present invention relates to photovoltaic combining inverter fields, and in particular to a kind of low-leakage current five switchs non-isolated single-phase photovoltaic
Gird-connected inverter and grid-connected system.
Background technique
With distributed energy further genralrlization, small in size, light-weight not isolated grid-connected inverter is increasingly subject to
The attention of people.The parasitic capacitor voltage of the photovoltaic DC side of conventional non-isolated type bridge-type inverter over the ground there are high fdrequency component,
(parasitic capacitance is not capacitor, is to be made of two pole plates and dielectric, then parasitic capacitance is unavoidable.
For example a circuit has many electric wires, and the capacitor formed between electric wire and electric wire is called parasitic capacitance), parasitic capacitance is generally in height
It can make a big impact to circuit in frequency circuit, act on photovoltaic DC side, the earth (device housings), parasitic capacitance, exchange side
Forming circuit will generate larger leakage current, and (parasitic capacitance in the application each means posting over the ground for crisis equipment and personnel safety
Raw capacitor).Such as the low common mode leakage current single-phase photovoltaic grid-connected inverter of five level of patent CN201710180346.8 and grid-connected
System reduces the leakage current of common-mode circuit, and the method for use belongs to the alternating current bypass method in additional circuit, needs to increase by two height
Frequency switching tube is dedicated for by-path turn-on；The disadvantages of that there are components is more, control is complicated, reduces the reliability and efficiency of system.
And there is also bridge arm direct pass risks for conventional bridge inverter, it is difficult to improve inverter working frequency.To prevent pipe
Arm is straight-through, dead zone can generally be arranged in switching tube driving signal, but this influences whether inverter efficiency, while it is difficult to increase control
Degree.There is scholar to propose the disadvantages of dual buck inverter, the bridge arm direct pass problem of solution, but circuit components are more, control is complicated
The reliability and efficiency of system can be reduced.
Summary of the invention
In view of the above technical problem, the purpose of the present invention is to provide a kind of low-leakage currents five to switch non-isolated single-phase photovoltaic
Gird-connected inverter and grid-connected system are realized through less component circuit, solve leakage current greatly and there are bridge arm direct pass risks
Problem.
The present invention uses following technical scheme are as follows:
A kind of low-leakage current five switchs non-isolated single-phase photovoltaic grid-connected inverter, comprising: the first power switch tube S 1, second
Power switch tube S 2, third power switch tube S 3, the 4th power switch tube S 4, the 5th power switch tube S 5, the first filter inductance
L1, the second filter inductance L2, diode D and filter capacitor C, wherein the external direct current input source of drain electrode of the first power switch tube S 1
Anode, the source electrode of the first power switch tube S 1 connect with the cathode of diode D, the cathode of diode D also respectively with the second function
The drain electrode of rate switching tube S2 is connected with the drain electrode of the 4th power switch tube S 4, and the source electrode of the second power switch tube S 2 passes through the first filter
Wave inductance L1 is connect with the drain electrode of the 5th power switch tube S 5, and the source electrode of the 4th power switch tube S 4 passes through the second filter inductance L2
It is connect with the drain electrode of third power switch tube S 3；The source electrode of third power switch tube S 3, the 5th power switch tube S 5 source electrode with
And the cathode of the external direct current input source of anode of diode D, the drain electrode of the first filter inductance L1 and the 5th power switch tube S 5
The external AC network/load of tie point, the second filter inductance L2 and the tie point of the drain electrode of third power switch tube S 3 are external
AC network/load, the both ends the filter capacitor C are connect with AC network/load both ends respectively.
Further, first power switch tube S 1, the second power switch tube S 2, third power switch tube S the 3, the 4th
Driving signal G1, G2, G3, G4 and G5 of power switch tube S 4 and the 5th power switch tube S 5 are obtained using following:
Obtain the sine value sin θ and given value of current amplitude reference value with the voltage square wave signal phase angle θ of synchronized
Im obtains transient current reference signal iref, the transient current reference signal irefFor sin θ and given value of current amplitude reference value
The product of Im；
Wherein, driving signal G2 and G3 is all made of transient current reference signal irefLetter after accessing comparator with zero-signal
Number；Driving signal G4 and S5 are all made of transient current reference signal irefIt is accessed after comparator with zero-signal after accessing phase inverter again
Signal；By transient current reference signal irefSignal after seeking difference with grid-connected current ig is sent into pi regulator, obtains modulating wave,
Obtained modulating wave and carrier wave are sent into after comparator again and obtain high frequency on-off signal, the carrier wave is high frequency sinusoidal signal or arteries and veins
Signal is rushed, the driving signal G1 uses the high frequency on-off signal.
Further, the diode D uses fast recovery diode.
Further, first power switch tube S 1, the second power switch tube S 2, third power switch tube S the 3, the 4th
Power switch tube S 4 and the 5th power switch tube S 5 are all made of metal-oxide half field effect transistor.
Further, the inductance value of the first filter inductance L1 and the second filter inductance L2 are equal.
A kind of grid-connected system switchs non-isolated single-phase light including photovoltaic module, AC network and the low-leakage current five
Gird-connected inverter is lied prostrate, wherein direct current input source uses the photovoltaic module.
Compared with prior art, the beneficial effects of the present invention are:
Low-leakage current five of the invention switchs non-isolated single-phase photovoltaic grid-connected inverter, and there are four kinds of operation modes, in afterflow
Stage realizes that positive-negative half-cycle is grid-connected by two independent circuits, and freewheeling period DC side is separated with exchange side, so that single-phase light
The common-mode voltage and differential mode voltage for lying prostrate inverter are free of high fdrequency component, ensure that Ground leakage current is smaller, i.e. parasitic capacitance two
End is free of high fdrequency component, has achieved the purpose that low-leakage current.Meanwhile electricity is gone here and there in each circuit to the application gird-connected inverter at work
Bridge arm direct pass risk is not present in sense, and it is not necessary that dead zone is arranged as traditional gird-connected inverter, having reached can work at higher frequencies
Purpose.Further, by additional fast recovery diode in freewheeling period afterflow, make that invention achieves high reliability.
Detailed description of the invention
Fig. 1 is the circuit diagram of grid-connected system of the present invention；
Fig. 2 is the driving signal schematic diagram of each power switch tube of gird-connected inverter of the present invention；
Fig. 3 is the circuit diagram that grid-connected system of the present invention connects to the control circuit；
Fig. 4 is the circuit diagram of operation mode I in the embodiment of the present invention；
Fig. 5 is the circuit diagram of operation mode II in the embodiment of the present invention；
Fig. 6 is the circuit diagram of operation mode III in the embodiment of the present invention；
Fig. 7 is the circuit diagram of operation mode IV in the embodiment of the present invention；
Fig. 8 is the grid-connected voltage and current waveform that grid-connected system passes through simulation model in the embodiment of the present invention；
Fig. 9 is grid-connected system inverter leakage current model in the embodiment of the present invention；
Figure 10 is grid-connected system mode I, II leakage current equivalent circuit in the embodiment of the present invention；
Figure 11 is grid-connected system mode III, IV leakage current equivalent circuit in the embodiment of the present invention；
Figure 12 is grid-connected system parasitic capacitance both end voltage u in the embodiment of the present inventionGWaveform；
Figure 13 is grid-connected system leakage current i in the embodiment of the present inventiontcmWaveform.
Specific embodiment
In the following, being described further in conjunction with attached drawing and specific embodiment to the present invention, it should be noted that not
Under the premise of conflicting, new implementation can be formed between various embodiments described below or between each technical characteristic in any combination
Example be
Embodiment:
It please refers to shown in Fig. 1-13, a kind of low-leakage current five switchs non-isolated single-phase photovoltaic grid-connected inverter, comprising: first
Power switch tube S 1, the second power switch tube S 2, third power switch tube S 3, the 4th power switch tube S 4, the 5th power switch
Pipe S5, the first filter inductance L1, the second filter inductance L2, diode D and filter capacitor C, wherein the first power switch tube S 1
Drain the anode of external direct current input source, and the source electrode of the first power switch tube S 1 is connect with the cathode of diode D, diode D's
Cathode is also connect with the drain electrode of the second power switch tube S 2 and the drain electrode of the 4th power switch tube S 4 respectively, the second power switch tube
The source electrode of S2 is connect by the first filter inductance L1 with the drain electrode of the 5th power switch tube S 5, the source electrode of the 4th power switch tube S 4
It is connect by the second filter inductance L2 with the drain electrode of third power switch tube S 3；The source electrode of third power switch tube S 3, the 5th function
The cathode of the external direct current input source of anode of the source electrode and diode D of rate switching tube S5, the first filter inductance L1 and the 5th
External AC network/the load of the tie point of the drain electrode of power switch tube S 5, the second filter inductance L2 and third power switch tube S 3
Drain electrode the external AC network/load of tie point, the both ends the filter capacitor C respectively with AC network/load both ends connect
It connects.
First power switch tube S 1, the second power switch tube S 2, third power switch tube S 3, the 4th power switch tube
S4 and driving signal G1, G2, G3, G4 and G5 of the 5th power switch tube S 5 are obtained using following:
Obtain the sine value sin θ and given value of current amplitude reference value with the voltage square wave signal phase angle θ of synchronized
Im obtains transient current reference signal iref, the transient current reference signal irefFor sin θ and given value of current amplitude reference value
The product of Im；
Wherein, driving signal G2 and G3 is all made of transient current reference signal irefLetter after accessing comparator with zero-signal
Number；Driving signal G4 and S5 are all made of transient current reference signal irefIt is accessed after comparator with zero-signal after accessing phase inverter again
Signal；By transient current reference signal irefSignal after seeking difference with grid-connected current ig is sent into pi regulator, obtains modulating wave,
Obtained modulating wave and carrier wave are sent into after comparator again and obtain high frequency on-off signal, the carrier wave is high frequency sinusoidal signal or arteries and veins
Signal is rushed, the driving signal G1 uses the high frequency on-off signal.
Preferably, the diode D uses fast recovery diode, and it is reliable in the current stream stage that the present invention can be improved
Property.
Preferably, first power switch tube S 1, the second power switch tube S 2, third power switch tube S 3, the 4th function
Rate switching tube S4 and the 5th power switch tube S 5 are all made of metal-oxide half field effect transistor.
Preferably, the inductance value of the first filter inductance L1 and the second filter inductance L2 are equal, to guarantee positive-negative half-cycle
Filter effect is consistent.
Grid-connected system of the invention switchs non-isolated list including photovoltaic module, AC network and the low-leakage current five
Phase photovoltaic combining inverter, wherein direct current input source uses the photovoltaic module, please refers to shown in Fig. 1,
Fig. 2 is the driving signal schematic diagram of each power switch tube of gird-connected inverter of the present invention, and wherein G1~G5 is power tube
The corresponding driving signal of S1~S5.Wherein G1 driving signal is relatively obtained by sinusoidal modulation wave and triangular carrier, G2~G3 driving
Signal is identical, and G4~G5 driving signal is identical.
Fig. 3 show the circuit diagram that the inverter connects to the control circuit, and control circuit is for driving the first power
Switching tube S1, the second power switch tube S 2, third power switch tube S 3, the 4th power switch tube S 4 and the 5th power switch tube
S5, control strategy are specific as follows:
Control circuit uses current loop control strategy, to power grid injection and network voltage with frequency in-phase current.Pass through locking phase
Network voltage is first converted into synchronous voltage square wave signal by circuit (phase-locked loop, PLL), to obtain
Corresponding sine table data sin θ is inquired at its phase angle, and by sin θ, given value of current amplitude reference value Im product (ImIt is given for electric current
Tentering value reference value oneself can be set) obtain transient current reference signal iref。
By transient current reference signal irefS2~S5 modulated signal is obtained compared with zero-signal.Specifically, can be by instantaneous electricity
Flow reference signal irefThe driving signal after comparator as S2, S3 is accessed with zero-signal, by transient current reference signal irefWith
After zero-signal accesses comparator, then access the driving signal after phase inverter as S4, S5.
In this way, working as transient current reference signal irefWhen > 0, S2, S3 conducting, S4, S5 shutdown；When transient current is with reference to letter
Number irefWhen < 0, S4, S5 conducting, S2, S3 shutdown.
By transient current reference signal irefAfter seeking difference with grid-connected current ig, it is sent into pi regulator, obtains modulating wave, (modulation
Wave, which refers to, will need the signal that transmits to go to change a certain parameter of carrier signal, such as amplitude, frequency, phase) tune that will obtain again
Wave processed and carrier wave are sent into comparator, and the carrier wave can be here high frequency sinusoidal signal or pulse signal, obtain the high frequency on-off of S1
The driving signal of signal.
By Fig. 2 and Fig. 3 it is found that the inverter system there are four kinds of operation modes, now in conjunction with Continuity signal and control strategy
Four kinds of operation modes of detailed analysis.
Operation mode I: as shown in figure 4, in network voltage positive half period, when switch S1 conducting, when transient current refers to
Signal irefWhen > 0, at this moment S2, S3 conducting, S4, S5 shutdown, there is S1, S2、S3Conducting, S4、S5Shutdown, input power is through S1、S2、
Filter inductance L1, capacitor C and AC network, S3It constitutes circuit to power to power grid, output voltage u0。
Operation mode II: as shown in figure 5, in network voltage positive half period, when switch S1 shutdown, when transient current refers to
Signal irefWhen > 0, at this moment S2, S3 conducting, S4, S5 shutdown, there is switch S2、S3Conducting, S1, S4、S5Shutdown, grid-connected current warp
S2, filter inductance L1, capacitor C and AC network, S3, diode D constitute continuous current circuit maintain grid-connected current, output voltage 0.
Operation mode III: as shown in fig. 6, in network voltage negative half-cycle, when switch S1 conducting, when transient current refers to
Signal irefWhen < 0, at this moment S4, S5 conducting, S2, S3 shutdown, there is switch S1、S4、S5Conducting, S2、S3Shutdown, input power warp
S1、S4, filter inductance L2, capacitor C and AC network, S5It constitutes circuit to power to power grid, output voltage is-u0。
Operation mode IV: as shown in fig. 7, in network voltage negative half-cycle, when switch S1 shutdown, when transient current refers to
Signal irefWhen < 0, at this moment S4, S5 conducting, S2, S3 shutdown, there is switch S4、S5Conducting, S1、S2、S3Shutdown, grid-connected current warp
S4, filter inductance L2, capacitor C and AC network, S5, diode D constitute continuous current circuit maintain grid-connected current, output voltage 0.
Moreover, inverter positive-negative half-cycle operating mode is identical, it is grid-connected in half period change current direction, therefore mode I,
III, the state equation of mode II, IV is consistent, and it is as follows to obtain modal equations according to voltage-second balance and Kirchhoff's second law:
Mode I, III is charged state, the i.e. stage to AC network output voltage；
Mode II, III is freewheeling period；
For proof theory analysis correctness, build simulation model and obtain grid-connected voltage, current waveform as shown in figure 8,
Illustrate that the application can reach through inverter the simple sinusoidal alternating current switched to direct current with network voltage with same frequency.
Parasitic capacitance both ends high fdrequency component over the ground now can effectively reduce to the application, so that the principle for reducing leakage current carries out
Illustrate:
Fig. 9 show inverter leakage current model, wherein CPVFor parasitic capacitance, parasitic capacitance passes through DC power cathode
End is formed into a loop altogether with photo-voltaic power supply cathode.Leakage current itcmWith parasitic capacitance both end voltage uGRelationship are as follows:
In conjunction with Fig. 9 inverter leakage current model, can be obtained under four kinds of operation modes shown in Fig. 4-Fig. 7, parasitic capacitance two
Hold voltage uGCorresponding change occurs with the switching of inverter operation mode.Now it is illustrated: in circuit operation, mould
State I and mode II high frequency switch, the u in equivalent modelANIt is inconsistent that transformation will lead to mode, Figure 10 show positive half period
Mode I, II leakage current equivalent circuit, u in figureANFor DC power supply u0By S1The output high-frequency direct-current arteries and veins generated after HF switch
Voltage is rushed, in this way when mode I, S1Conducting, AN and u0It is equivalent to parallel connection, therefore uAN=u0, electric current is through filter inductance L1, capacitor C with
DC power cathode is returned to after power grid, during DC power supply is to grid charging, parasitic capacitance CPVIt is short-circuited, both end voltage uG
=0.When mode II, S1Shutdown, AN and u0It is equivalent to disconnection, therefore uAN=0, continuous current circuit maintains grid-connected current, and electric current is through filtering
Inductance L1, capacitor C and power grid form continuous current circuit, maintain grid-connected current, during positive half cycle afterflow, parasitic capacitance CPVStill by
Short circuit, both end voltage uG=0.Therefore in positive half period, parasitic capacitance both end voltage remains 0.
uG=0 (4)
Figure 11 show negative half-cycle mode III, IV leakage current equivalent circuit.When mode III, S1Conducting, AN and u0Parallel connection,
Therefore uAN=u0, loop current is through filter inductance L where DC power supply2, return to DC power cathode after capacitor C and power grid, it is parasitic
Capacitor CPVIt is short-circuited.Power grid and parasitic capacitance reverse parallel connection at this time, during DC power supply is to grid charging, parasitic capacitance two
Hold voltage uG=ugrid.When mode IV, S1Shutdown, AN and u0It disconnects, therefore uAN=0, electric current is through filter inductance L2, capacitor C and power grid
Continuous current circuit is formed, grid-connected current, parasitic capacitance C are maintainedPVIt is short-circuited.Power grid and parasitic capacitance still reverse parallel connection at this time, negative
During half cycle afterflow, parasitic capacitance both end voltage uG=ugrid.Therefore in negative half-cycle, parasitic capacitance both end voltage is remained
Network voltage.
uG=ugrid (5)
Figure 12, Figure 13 are respectively parasitic capacitance both end voltage uGWith leakage current itcmWaveform.As shown in Figure 12.Novel inversion
Device parasitic capacitance both end voltage positive half cycle is 0, and negative half period does not contain high fdrequency component with f=50Hz low frequency variations, can be by leakage current
Inhibit in a certain range.As shown in Figure 13, leakage current peak value is about 25mA, far below gird-connected inverter to leakage current 300mA
Requirement, reach Grid-connection standards.
Low-leakage current five of the invention switchs non-isolated single-phase photovoltaic grid-connected inverter and passes through two independences in freewheeling period
Circuit realize that positive-negative half-cycle is grid-connected, freewheeling period DC side is separated with exchange side, so that the common mode of single-phase photovoltaic inverter is electric
Pressure and differential mode voltage are free of high fdrequency component, ensure that Ground leakage current is smaller, i.e., parasitic capacitance both ends are free of high fdrequency component, reach
The purpose for having arrived low-leakage current, in freewheeling period, under HF switch is closed, DC side just with exchange side disconnection, do not need
In addition increase circuit.Compared with prior art, have the advantages that device is less, loss is smaller.Meanwhile the application gird-connected inverter exists
Inductance is gone here and there in each circuit in work, and bridge arm direct pass risk is not present, and it is not necessary that dead zone is arranged as traditional gird-connected inverter, is reached
The purpose that can be worked at higher frequencies.Further, the present invention is made in freewheeling period afterflow by additional fast recovery diode
High reliability is reached.
It will be apparent to those skilled in the art that can make various other according to the above description of the technical scheme and ideas
Corresponding change and deformation, and all these changes and deformation all should belong to the protection scope of the claims in the present invention
Within.
Claims (6)
1. a kind of low-leakage current five switchs non-isolated single-phase photovoltaic grid-connected inverter characterized by comprising the first power switch
Pipe S1, the second power switch tube S 2, third power switch tube S 3, the 4th power switch tube S 4, the 5th power switch tube S 5, first
Filter inductance L1, the second filter inductance L2, diode D and filter capacitor C, wherein the drain electrode of the first power switch tube S 1 is external straight
The anode of input source is flowed, the source electrode of the first power switch tube S 1 is connect with the cathode of diode D, and the cathode of diode D is also distinguished
It is connect with the drain electrode of the second power switch tube S 2 and the drain electrode of the 4th power switch tube S 4, the source electrode of the second power switch tube S 2 is logical
It crosses the first filter inductance L1 to connect with the drain electrode of the 5th power switch tube S 5, the source electrode of the 4th power switch tube S 4 passes through the second filter
Wave inductance L2 is connect with the drain electrode of third power switch tube S 3；The source electrode of third power switch tube S 3, the 5th power switch tube S 5
Source electrode and diode D the external direct current input source of anode cathode, the first filter inductance L1 and the 5th power switch tube
The company of the drain electrode of the external AC network/load of the tie point of the drain electrode of S5, the second filter inductance L2 and third power switch tube S 3
External AC network/the load of contact, the both ends the filter capacitor C are connect with AC network/load both ends respectively.
2. low-leakage current five according to claim 1 switchs non-isolated single-phase photovoltaic grid-connected inverter, which is characterized in that institute
State the first power switch tube S 1, the second power switch tube S 2, third power switch tube S 3, the 4th power switch tube S 4 and the 5th function
Driving signal G1, G2, G3, G4 and G5 of rate switching tube S5 is obtained using following:
The sine value sin θ and given value of current amplitude reference value Im with the voltage square wave signal phase angle θ of synchronized are obtained, is obtained
To transient current reference signal iref, the transient current reference signal irefFor multiplying for sin θ and given value of current amplitude reference value Im
Product；
Wherein, driving signal G2 and G3 is all made of transient current reference signal irefSignal after accessing comparator with zero-signal；It drives
Dynamic signal G4 and S5 are all made of transient current reference signal irefThe letter after accessing phase inverter again is accessed after comparator with zero-signal
Number；By transient current reference signal irefSignal after seeking difference with grid-connected current ig is sent into pi regulator, obtains modulating wave, then will
Obtained modulating wave and carrier wave obtains high frequency on-off signal after being sent into comparator, and the carrier wave is that high frequency sinusoidal signal or pulse are believed
Number, the driving signal G1 uses the high frequency on-off signal.
3. low-leakage current five according to claim 1 switchs non-isolated single-phase photovoltaic grid-connected inverter, which is characterized in that institute
Diode D is stated using fast recovery diode.
4. low-leakage current five according to claim 1 switchs non-isolated single-phase photovoltaic grid-connected inverter, which is characterized in that institute
State the first power switch tube S 1, the second power switch tube S 2, third power switch tube S 3, the 4th power switch tube S 4 and the 5th function
Rate switching tube S5 is all made of metal-oxide half field effect transistor.
5. low-leakage current five according to claim 1 switchs non-isolated single-phase photovoltaic grid-connected inverter, which is characterized in that institute
The inductance value for stating the first filter inductance L1 and the second filter inductance L2 is equal.
6. a kind of grid-connected system, which is characterized in that including photovoltaic module, AC network and as described in any one of claim 1 to 5
Low-leakage current five switch non-isolated single-phase photovoltaic grid-connected inverter, wherein direct current input source use the photovoltaic module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910520559.XA CN110071652B (en) | 2019-06-17 | 2019-06-17 | Low-leakage-current five-switch non-isolated single-phase photovoltaic grid-connected inverter and grid-connected system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910520559.XA CN110071652B (en) | 2019-06-17 | 2019-06-17 | Low-leakage-current five-switch non-isolated single-phase photovoltaic grid-connected inverter and grid-connected system |
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| Publication Number | Publication Date |
|---|---|
| CN110071652A true CN110071652A (en) | 2019-07-30 |
| CN110071652B CN110071652B (en) | 2021-05-21 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110311585A (en) * | 2019-07-31 | 2019-10-08 | 上海电力大学 | Inhibit the non-isolated single-phase photovoltaic grid-connected inverter and control method of common mode current |
| CN112865576A (en) * | 2021-01-18 | 2021-05-28 | 国家电网有限公司 | Single-phase five-level inverter circuit and modulation method thereof |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003274674A (en) * | 2002-03-12 | 2003-09-26 | Takasago Seisakusho:Kk | Zero-voltage switching mode inverter |
| CN102684522A (en) * | 2011-03-09 | 2012-09-19 | 上海康威特吉能源技术有限公司 | Non-isolated photovoltaic grid-connected inverter and control method thereof |
| CN102739087A (en) * | 2012-06-12 | 2012-10-17 | 丰郅(上海)新能源科技有限公司 | Synchronous follow current inverter topology without common-mode interference |
| CN103312203A (en) * | 2012-03-12 | 2013-09-18 | 丰郅(上海)新能源科技有限公司 | High-efficiency inverter topology |
| CN105978388A (en) * | 2016-06-02 | 2016-09-28 | 燕山大学 | Single-phase voltage boosting-reducing type photovoltaic inverter capable of inhibiting current leakage and control method thereof |
| CN108418453A (en) * | 2018-03-20 | 2018-08-17 | 盐城工学院 | A kind of photovoltaic combining inverter and its control method |
| CN108494003A (en) * | 2018-04-25 | 2018-09-04 | 国网黑龙江省电力有限公司牡丹江供电公司 | A kind of suppressing method inhibiting photovoltaic parallel in system leakage current |
| CN207884511U (en) * | 2018-03-15 | 2018-09-18 | 詹笑 | A kind of high-frequency induction heating power with Sofe Switch |
| CN109194175A (en) * | 2018-08-27 | 2019-01-11 | 江苏大学 | A kind of non-isolated grid-connected inverter circuit of type leakage current and control method altogether |
-
2019
- 2019-06-17 CN CN201910520559.XA patent/CN110071652B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003274674A (en) * | 2002-03-12 | 2003-09-26 | Takasago Seisakusho:Kk | Zero-voltage switching mode inverter |
| CN102684522A (en) * | 2011-03-09 | 2012-09-19 | 上海康威特吉能源技术有限公司 | Non-isolated photovoltaic grid-connected inverter and control method thereof |
| CN103312203A (en) * | 2012-03-12 | 2013-09-18 | 丰郅(上海)新能源科技有限公司 | High-efficiency inverter topology |
| CN102739087A (en) * | 2012-06-12 | 2012-10-17 | 丰郅(上海)新能源科技有限公司 | Synchronous follow current inverter topology without common-mode interference |
| CN105978388A (en) * | 2016-06-02 | 2016-09-28 | 燕山大学 | Single-phase voltage boosting-reducing type photovoltaic inverter capable of inhibiting current leakage and control method thereof |
| CN207884511U (en) * | 2018-03-15 | 2018-09-18 | 詹笑 | A kind of high-frequency induction heating power with Sofe Switch |
| CN108418453A (en) * | 2018-03-20 | 2018-08-17 | 盐城工学院 | A kind of photovoltaic combining inverter and its control method |
| CN108494003A (en) * | 2018-04-25 | 2018-09-04 | 国网黑龙江省电力有限公司牡丹江供电公司 | A kind of suppressing method inhibiting photovoltaic parallel in system leakage current |
| CN109194175A (en) * | 2018-08-27 | 2019-01-11 | 江苏大学 | A kind of non-isolated grid-connected inverter circuit of type leakage current and control method altogether |
Non-Patent Citations (1)
| Title |
|---|
| YUNZHONG DAI等: ""Dual-buck full-bridge grid-connected inverter with common-mode leakage current elimination"", 《ELECTRONICS LETTERS ( VOLUME: 54 , ISSUE: 2 , 1.25 2018 )》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110311585A (en) * | 2019-07-31 | 2019-10-08 | 上海电力大学 | Inhibit the non-isolated single-phase photovoltaic grid-connected inverter and control method of common mode current |
| CN112865576A (en) * | 2021-01-18 | 2021-05-28 | 国家电网有限公司 | Single-phase five-level inverter circuit and modulation method thereof |
| CN112865576B (en) * | 2021-01-18 | 2024-02-02 | 国家电网有限公司 | Single-phase five-level inverter circuit and modulation method thereof |
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