CN109842311A - A kind of grid-connected micro- inverter of three port inverse-excitation types and modulator approach with power decoupling circuit - Google Patents
A kind of grid-connected micro- inverter of three port inverse-excitation types and modulator approach with power decoupling circuit Download PDFInfo
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- CN109842311A CN109842311A CN201910053420.9A CN201910053420A CN109842311A CN 109842311 A CN109842311 A CN 109842311A CN 201910053420 A CN201910053420 A CN 201910053420A CN 109842311 A CN109842311 A CN 109842311A
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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
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Abstract
The invention discloses a kind of grid-connected micro- inverter of three port inverse-excitation types and modulator approach with power decoupling circuit, the inverter includes three port inverse-excitation converting circuits, full bridge inverter and output filter circuit, one group of primary side winding of three port inverse-excitation converting circuits is connected with a new power decoupling circuit, third port is constituted to realize power decoupled, it effectively inhibits the low-frequency fluctuation on DC bus, reduce decoupling capacitance capacitance, so that the thin-film capacitor long using the service life, capacitance is low replaces the electrolytic capacitor in original technology.The advantages of inverter: it ensure that the life and reliability of inverter；Conducive to maximum power point tracking (MPPT) is realized, inverter transfer efficiency is improved；Meanwhile the decoupling circuit structure of proposition is simple, and a switching tube and a capacitor is used only, reduces inverter cost and volume.
Description
Technical field
The present invention relates to a kind of grid-connected micro- inverter, in particular to a kind of three ports of achievable power decoupled function
The grid-connected micro- inverter of inverse-excitation type.
Background technique
Solar energy has widely distributed, renewable, no pollution to the environment etc. many excellent as universally acknowledged clean energy resource
Point, meanwhile, the development and utilization of solar energy solves the problems, such as the environmental pollution of facing mankind and energy shortage, become it is current or even
Most there is one of the new energy of potentiality to be exploited in future.
In recent years, photovoltaic generating system is widely used in the rapid growth and high demand of electric power, more and more small-sized works
Photovoltaic generating system is applied in small-scale power generation by factory and residential customer.Currently, micro- inverter is for realizing low-power
The state-of-the-art method of photovoltaic parallel in system, which, which is connected to behind each photovoltaic panel, is used to realize the conversion of direct current to exchange.
Compared with traditional centralized inverter and string type inverter, it has its unique superiority, including plug-and-play feature；
Modularization advantage (such as each module individually carries out MPPT)；Solve module mismatch problem etc..These advantages make micro- inversion
Device becomes the best solution of low-power consumption and Photovoltaic Building Integration (BIPV) system.
In single-phase grid-connected photovoltaic power generation system, in order to make photovoltaic module obtain maximum power generation efficiency, it will usually be added most
High-power tracking (MPPT), so that photovoltaic module outlet side provides firm power, but gird-connected inverter output power is twice
The pulsating power of power frequency period, this results in photovoltaic component DC outlet side to generate low-frequency fluctuation, while reducing MPPT efficiency.It passes
The solution of system mostly uses greatly electrolytic capacitor to be connected in parallel on photovoltaic module outlet side and realizes the instantaneous output work of photovoltaic combining inverter
The decoupling of rate and photovoltaic module instantaneous output power, i.e. power decoupled technology.However the service life of electrolytic capacitor is well below photovoltaic
The service life of component seriously limits the working life of inverter, greatly reduces the reliability of grid-connected photovoltaic system.
For above-mentioned disadvantage, some particularly micro- inverter topology knots based on thin-film capacitor are had proposed at present
It is uneven that the additional instantaneous input-output power of power decoupling circuit processing single-phase photovoltaic grid-connected inverter is added in structure in circuit
Weighing apparatus problem, to replace electrolytic capacitor with the thin-film capacitor of low-capacitance, long-life.However the most of power decoupleds proposed at present
Circuit structure is complicated, and component is more, inconsistent with the low cost and small size of micro- inverter.
Summary of the invention
Goal of the invention: it is mentioned for grid-connected micro- inverter in background technique and the shortcomings of the prior art, the present invention
A kind of grid-connected micro- inverter of three port inverse-excitation types with power decoupled function is supplied, decoupling not only can be effectively reduced in it
Capacitor's capacity extends the service life of inverter, improves photovoltaic parallel in system to replace electrolytic capacitor using thin-film capacitor
Reliability；Meanwhile decoupling circuit structure is simple, can reduce the cost and volume of inverter.
To achieve the above object, a kind of the technical solution adopted by the present invention are as follows: three port flybacks with power decoupling circuit
The grid-connected micro- inverter of formula, including sequentially connected three ports inverse-excitation converting circuit A, full bridge inverter C and output filtering
Circuit D；Power decoupling circuit a B, the power decoupling circuit B and described three are connected in the inverse-excitation converting circuit of three port
One group of primary side winding of port inverse-excitation converting circuit A is connected.
Further: the three ports inverse-excitation converting circuit A includes filter capacitor, input diode, primary side switch pipe, anti-
Violent change depressor, secondary-side switch pipe and secondary side rectifier diode；The input filter capacitor is in parallel with solar photovoltaic assembly；It is described
The anode of input diode is connect with one end of the input filter capacitor；The cathode of the input diode and the flyback become
The Same Name of Ends of first primary side winding of depressor connects；The different name end of first primary side winding of the flyback transformer and the primary side
The drain electrode of switching tube connects, and the Same Name of Ends of the second primary side winding of the source electrode and flyback transformer of the primary side switch pipe connects
It connects；The different name end of the vice-side winding of the flyback transformer is connect with the anode of the secondary side rectifier diode；The pair side is whole
The cathode of stream diode is connect with the drain electrode of the secondary-side switch pipe；The source electrode of the secondary-side switch pipe and full-bridge inverting electricity
The drain electrode of the first inverse switch pipe on road is connected with the drain electrode of the second inverse switch pipe；The vice-side winding of the flyback transformer
Same Name of Ends is connect with the source electrode of third inverse switch pipe of the full bridge inverter and the source electrode of the 4th inverse switch pipe.
The power decoupling circuit B includes a decoupling capacitance and a decoupling switch pipe, the leakage of the decoupling switch pipe
Pole is connect with the different name end of the second primary side winding of the flyback transformer of three port inverse-excitation converting circuit；The decoupling switch
The source electrode of pipe is connect with one end of one end of the input filter capacitor and the decoupling capacitance；The other end of the decoupling capacitance
With the Same Name of Ends of the second primary side winding of the source electrode and flyback transformer of the primary side switch pipe of three port inverse-excitation converting circuit
Connection.
The full bridge inverter C includes the first inverse switch pipe, the second inverse switch pipe, third inverse switch pipe and the
Four inverse switch pipes；The interconnection of the drain electrode and the drain electrode of the second inverse switch pipe of the first inverse switch pipe；Institute
It states the drain electrode connection of the source electrode and the third inverse switch pipe of the first inverse switch pipe and is filtered with the output of output filter circuit D
Wave inductance is connected with one end of output filter capacitor；The leakage of the source electrode and the 4th inverse switch pipe of the second inverse switch pipe
Pole connects and is connected with the other end of the output filter capacitor of output filter circuit D, the source electrode of the third inverse switch pipe
It is connected with the source electrode of the 4th inverse switch pipe.
The input filter capacitor, decoupling capacitance and output filter capacitor are thin-film capacitor.
The primary side switch pipe, secondary-side switch pipe and decoupling switching tube are HF switch pipe, the full bridge inverter
First inverse switch Guan Zhi, tetra- inverse switch pipe is power frequency switching tube, is controlled by power frequency driving signal, the first inverse switch pipe
It is driven with third inverse switch pipe, the second inverse switch pipe and the 4th inverse switch pipe reverse phase；First inverse switch pipe and the 4th
Inverse switch pipe, the second inverse switch pipe and third inverse switch pipe driven in phase.All switching tubes are MOSFET pipe.
The technical solution of method of the invention are as follows: the grid-connected micro- inverter of three port inverse-excitation types with power decoupling circuit
Modulator approach, including following stage of modulating:
First stage, primary side switch pipe S1Conducting, solar photovoltaic assembly and decoupling capacitance are jointly to flyback transformer original
Side magnetizing inductance transmits energy, and flyback transformer primary side magnetizing inductance magnetizes, and stores energy, decoupling capacitance releases energy at this time.
Flyback transformer primary side excitation inductance current increases to its peak value i from zero linearpk1:
Wherein, LmFor flyback transformer magnetizing inductance；d1For primary side switch pipe S1Duty ratio；TsFor HF switch pipe
Switch periods, VpvFor the output voltage of solar photovoltaic assembly, VCDFor decoupling capacitance voltage；
Second stage, primary side switch pipe S1Shutdown, secondary-side switch pipe S2Conducting, flyback transformer magnetizing inductance stores at this time
Part energy be transmitted to secondary side, power grid is transferred to by full bridge inverter C, the rank when energy needed for reaching power grid
Section terminates.At this point, secondary side output electric current reaches minimum value ipk2:
Wherein, N13For flyback transformer N1And N3Turn ratio, VgFor the amplitude of network voltage；IgFor the width of power network current
Value；Obviously, the envelope of secondary side output electric current is half-sinusoid；
Phase III, secondary-side switch pipe S2Shutdown, decoupling switch pipe S3Conducting, flyback transformer magnetizing inductance is remaining at this time
Energy pass through the second primary side winding of flyback transformer N2With decoupling switching tube S3It charges to decoupling capacitance, when primary side magnetizing inductance
The stage terminates when electric current is reduced to zero, and the energy of decoupling capacitance storage can continue in next high frequency period to flyback transformer original
Side magnetizing inductance magnetizes, and flyback transformer primary side excitation inductance current is i when which startspk3:
Fourth stage, primary side excitation inductance current ipk3When being reduced to zero, into fourth stage, all switching tubes are closed at this time
It is disconnected, flyback transformer magnetic reset.
A kind of grid-connected micro- inverter of three port inverse-excitation types with power decoupling circuit provided by the invention, compared to existing
Technology has the advantages that
(1) a kind of new power decoupling circuit structure used is simple, few using component, is only applicable in a capacitor and one
A switching tube is consistent with the purpose of micro- inverter small size, low cost, while the control that can also greatly simplify circuit is calculated
Method；
(2) pulsating power effectively can be transferred to decoupling capacitance both ends by the power decoupling circuit proposed, to inhibit
The low-frequency fluctuation of photovoltaic component DC side, the capacitance decoupled needed for reducing, replace big electrolytic capacitor using thin-film capacitor, mention
The high service life and reliability of micro- inverter；
(3) the three port inverse-excitation converting circuits used have compact-sized, component excellent using less, power density is high etc.
Point, and the function that three ports are realized is different, a port for realizing maximum power point tracking (MPPT), another
Port realization is grid-connected, and third port is dedicated for realization power decoupled；
(4) the advantages of combining inverse-excitation converting circuit realizes electrical isolation using high frequency transformer, and makes inverse-excitation converting circuit
In discontinuous conduct mode, discontinuous mode has the characteristic of current source for work, exports wider range of input, boost capability also compared with
By force, while having many advantages, such as that small loss, high reliablity, control are simple, be beneficial to realize soft switch technique and simplified control algorithm；
Compared with other micro- inverters with power decoupling circuit, this economic, compact, reliable light of the invention
Lie prostrate grid-connected micro- inverter has very highland practicability in current distributed solar energy low power applications.
Detailed description of the invention
Fig. 1 is a kind of circuit knot of grid-connected micro- inverter of three port inverse-excitation types with power decoupling circuit of the invention
Composition；
Fig. 2 is grid-connected micro- inverter of the invention grid-connected voltage, electric current, decoupling capacitance electricity in a grid cycle
Pressure and corresponding power waveform diagram；
Fig. 3 is grid-connected micro- inverter of the invention each switching tube pulse and main electrical current wave in a grid cycle
Shape figure；
Fig. 4 is the three port inverse-excitation converting circuits of the invention with power decoupling circuit four within a HF switch period
The equivalent circuit diagram of a working stage；
Have in figure: three port inverse-excitation converting circuit A；Power decoupling circuit B；Full bridge inverter C；Output filter circuit D,
The output voltage V of solar photovoltaic assemblypv；Input filter capacitor Cpv；Input diode D1；Primary side switch pipe S1；Flyback transformation
Device T；Flyback transformer T includes the first primary side winding N1, the second primary side winding N2With vice-side winding N3, N1:N2:N3=1:1:N；Solution
Coupling capacitor CD；Decoupling switch pipe S3；Secondary side rectifier diode D2；Secondary-side switch pipe S2；First to fourth inverse switch pipe Sa1~
Sa4；Output filter capacitor Cf；Output inductor Lf；The output power P of solar photovoltaic assemblypv；The output of gird-connected inverter
Power Pg；Pulsating power Pd；Network voltage ug；Power network current ig；Decoupling capacitance voltage VCD；Grid cycle Tg；Three port flybacks become
Change circuit input current iin；Decoupling capacitance electric current iCD；Secondary side exports electric current io。
Specific embodiment
The present invention will be further explained with reference to the accompanying drawing.
Referring to Fig.1, the invention proposes a kind of grid-connected micro- inverter of three port inverse-excitation types with power decoupling circuit,
It includes sequentially connected three ports inverse-excitation converting circuit A, full bridge inverter C and output filter circuit D；Photovoltaic group
Part is connected with the input terminal of three port inverse-excitation converting circuit A；Output end and the full-bridge inverting electricity of three port inverse-excitation converting circuit A
Road B is connected；Full bridge inverter C is connected with output filter circuit D.A power is connected in three port inverse-excitation converting circuits
The second primary side winding N of decoupling circuit B, power decoupling circuit B and three port inverse-excitation converting circuit A2It is connected, to constitute solution
Coupling port is to realize power decoupled.
Three port inverse-excitation converting circuit A include input filter capacitor Cpv, input diode D1, primary side switch pipe S1, flyback
Transformer T, pair side rectifier diode D2With secondary-side switch pipe S3, flyback transformer T includes the first primary side winding of flyback transformer
N1, the second primary side winding N2With vice-side winding N3；Input filter capacitor CpvIt is in parallel with solar photovoltaic assembly；Input diode D1
Anode with input filter capacitor CpvOne end connection；Input diode D1Cathode and flyback transformer T the first primary side around
Group N1Same Name of Ends connection；The first primary side winding N of flyback transformer T1Different name end and primary side switch pipe S1Drain electrode connection,
Primary side switch pipe S1Source electrode and flyback transformer T the second primary side winding N2Same Name of Ends connection；The secondary side of flyback transformer T
Winding N3Different name end and pair side rectifier diode D2Anode connection；Secondary side rectifier diode D2Cathode and secondary-side switch pipe
S2Drain electrode connection；Secondary-side switch pipe S2Source electrode and full bridge inverter C the first inverse switch pipe Sa1Drain electrode and second
Inverse switch pipe Sa2Drain electrode connection；The vice-side winding N of flyback transformer T3Same Name of Ends and full bridge inverter C third it is inverse
Become switching tube Sa3Source electrode and the 4th inverse switch pipe Sa4Source electrode connection.
Power decoupling circuit B includes decoupling capacitance CDWith decoupling switching tube S3, decoupling switch pipe S3Drain electrode and flyback transformation
The second primary side winding N of device T2Different name end connection；Decoupling switch pipe S3Source electrode and input filter capacitor CpvOne end and solution
Coupling capacitor CDOne end connection；Decoupling capacitance CDThe other end and primary side switch pipe S1Source electrode and flyback transformer T it is second former
Side winding N2Same Name of Ends connection.
Full bridge inverter C includes first to fourth inverse switch pipe Sa1~Sa4, the first inverse switch pipe Sa1Drain electrode with
The second inverse switch pipe Sa2Drain electrode be connected, the first inverse switch pipe Sa1Source electrode and third inverse switch pipe Sa3
Drain electrode connection and the output inductor L with output filter circuit DfWith output filter capacitor CfOne end be connected, second is inverse
Become switching tube Sa2Source electrode and the 4th inverse switch pipe Sa4Drain electrode connection and the output filter capacitor C with output filter circuit Df
The other end be connected, third inverse switch pipe Sa3Source electrode and the 4th inverse switch pipe Sa4Source electrode be connected.
Input filter capacitor Cpv, decoupling capacitance CDAnd output filter capacitor CfIt is thin-film capacitor.Primary side switch pipe S1, it is secondary
Side switching tube S2With decoupling switching tube S3For HF switch pipe, first to fourth inverse switch pipe Sa1~Sa4For power frequency switching tube.
All switching tubes available MOSFET pipe when specific implementation.
Such as Fig. 2, in a grid cycle, network voltage, electric current are respectively as follows:
ug=Vgsin(ωt)
ig=Igsin(ωt)
Therefore the instantaneous output power of inverter are as follows:
Wherein, VgFor the amplitude of network voltage；IgFor the amplitude of power network current；ω is network voltage angular frequency.
In single-phase grid-connected system, solar photovoltaic assembly obtains constant output power according to MPPT:
Ppv=VpvIpv
Wherein, Vpv、IpvThe respectively output voltage of solar photovoltaic assembly, electric current.
Ideally, direct current component, that is, average value of inverter output power is certain, and is equal to solar energy
Component instantaneous output power is lied prostrate, AC portion is the pulsating power for being twice in mains frequency, that is, decoupling circuit needs
The pulsating power of processing:
Pd(t)=Ppvcos(2ωt)
The pulsating power usually passes through decoupling circuit and is transferred to decoupling capacitance both ends, as shown in Fig. 2, according to photovoltaic
Component instantaneous output power PpvWith micro- inverter instantaneous output power PgIt mismatches, the operation of inverter can be divided into two kinds of moulds
Formula.Work as PpvGreater than Pg, decoupling capacitance absorbs dump energy at this time, and decoupling capacitance voltage, which continuously rises, reaches peak value VC-max；Work as Ppv
Less than Pg, decoupling capacitance releases energy at this time, and to electrical grid transmission energy, decoupling capacitance voltage, which continuously declines, reaches VC-min.Due to
Decoupling circuit only handles pulsating power, therefore its mean power is zero.
It is illustrated in figure 3 the phase of the grid-connected micro- inverter of three port inverse-excitation types each switching tube in a grid cycle
Answer pulse and current waveform figure.
Based on These characteristics, the three port inverse-excitation converting circuits of the invention with power decoupling circuit are in a HF switch
Operating mode in period particularly may be divided into four working stages, and each stage equivalent circuit is as shown in figure 4, three port inverse-excitation convertings
Circuit works in discontinuous conduct mode, and specific work process is as follows:
First stage, such as Fig. 4 (a), primary side switch pipe S1Conducting, solar photovoltaic assembly and decoupling capacitance are jointly to flyback
Transformer primary side magnetizing inductance transmits energy, and flyback transformer primary side magnetizing inductance magnetizes, and stores energy, decoupling capacitance is released at this time
Exoergic amount.Flyback transformer primary side excitation inductance current increases to its peak value i from zero linearpk1:
Wherein, LmFor flyback transformer magnetizing inductance；d1For primary side switch pipe S1Duty ratio；TsFor HF switch pipe
Switch periods.
Second stage, such as Fig. 4 (b), primary side switch pipe S1Shutdown, secondary-side switch pipe S2It is connected, at this time flyback transformer excitation
The part energy of inductance storage is transmitted to secondary side, is transferred to power grid by full bridge inverter C, the energy needed for reaching power grid
The stage terminates when amount.At this point, secondary side output electric current reaches minimum value ipk2:
Wherein, N13For flyback transformer N1And N3Turn ratio.Obviously, the envelope of secondary side output electric current is half-sinusoid.
Phase III, such as Fig. 4 (c), secondary-side switch pipe S2Shutdown, decoupling switch pipe S3It is connected, at this time flyback transformer excitation
The remaining energy of inductance passes through the second primary side winding of flyback transformer N2With switching tube S3It charges to decoupling capacitance, when primary side excitation
The stage terminates when inductive current is reduced to zero.The energy of decoupling capacitance storage can continue in next high frequency period to flyback transformation
Device primary side magnetizing inductance magnetizes.Flyback transformer primary side excitation inductance current is i when the stage startspk3:
Fourth stage, such as Fig. 4 (d), primary side excitation inductance current ipk3When being reduced to zero, into fourth stage.It is all at this time to open
It closes pipe to be turned off, flyback transformer magnetic reset.
To sum up, a kind of grid-connected micro- inverter of three port inverse-excitation types with power decoupling circuit of the invention, the inversion
Device includes three port inverse-excitation converting circuits, full bridge inverter and output filter circuit, by the one of three port inverse-excitation converting circuits
Group primary side winding is connected with a new power decoupling circuit, constitutes third port to realize power decoupled, effectively inhibits
Low-frequency fluctuation on DC bus reduces decoupling capacitance capacitance, thus the thin-film capacitor long using the service life, capacitance is low replace it is former
There is the electrolytic capacitor in technology.The advantages of inverter: it ensure that the life and reliability of inverter；It is advantageously implemented maximum work
Rate point tracking (MPPT), improves inverter transfer efficiency；Meanwhile the decoupling circuit structure of proposition is simple, opens using only one
Pipe and a capacitor are closed, the control algolithm of circuit is simplified, reduces inverter cost and volume.
To sum up, three port inverse-excitation types grid-connected micro- inverter according to figure 1 with power decoupling circuit, according to upper
Technical solution is stated, grid-connected micro- inverter can be made to obtain maximum power from solar photovoltaic assembly, improve grid-connected system
The transfer efficiency of system；And decoupling capacitance capacitance is effectively reduced by the simple decoupling circuit port of structure, hold electrolytic capacitor
It is worth thin-film capacitor low, that the service life is long to be replaced, improves the service life and reliability of grid-connected micro- inverter, reduce inverter
Cost and volume.
Claims (8)
1. a kind of grid-connected micro- inverter of three port inverse-excitation types with power decoupling circuit, which is characterized in that it includes successively
Three port inverse-excitation converting circuit A, full bridge inverter C and the output filter circuit D of connection；Three port inverse-excitation converting circuit
In be connected to one group of primary side of power decoupling circuit a B, the power decoupling circuit B and the three ports inverse-excitation converting circuit A
Winding is connected.
2. a kind of grid-connected micro- inverter of three port inverse-excitation types with power decoupling circuit according to claim 1,
It is characterized in that, the three ports inverse-excitation converting circuit A includes input filter capacitor, input diode, primary side switch pipe, flyback change
Depressor, secondary-side switch pipe and secondary side rectifier diode；The input filter capacitor is in parallel with solar photovoltaic assembly；The input
The anode of diode is connect with one end of the input filter capacitor；The cathode of the input diode and the flyback transformer
The first primary side winding Same Name of Ends connection；The different name end of first primary side winding of the flyback transformer and the primary side switch
The drain electrode of pipe connects, and the Same Name of Ends of the second primary side winding of the source electrode and flyback transformer of the primary side switch pipe is connect；
The different name end of the vice-side winding of the flyback transformer is connect with the anode of the secondary side rectifier diode；Pair side rectification two
The cathode of pole pipe is connect with the drain electrode of the secondary-side switch pipe；The source electrode of the secondary-side switch pipe and the full bridge inverter
The drain electrode of first inverse switch pipe is connected with the drain electrode of the second inverse switch pipe；The vice-side winding of the flyback transformer it is of the same name
End is connect with the source electrode of third inverse switch pipe of the full bridge inverter and the source electrode of the 4th inverse switch pipe.
3. a kind of grid-connected micro- inverter of three port inverse-excitation types with power decoupling circuit according to claim 2,
It is characterized in that, the power decoupling circuit B includes a decoupling capacitance and a decoupling switch pipe, the leakage of the decoupling switch pipe
Pole is connect with the different name end of the second primary side winding of the flyback transformer of three port inverse-excitation converting circuit；The decoupling switch
The source electrode of pipe is connect with one end of one end of the input filter capacitor and the decoupling capacitance；The other end of the decoupling capacitance
With the Same Name of Ends of the second primary side winding of the source electrode and flyback transformer of the primary side switch pipe of three port inverse-excitation converting circuit
Connection.
4. a kind of grid-connected micro- inverter of three port inverse-excitation types with power decoupling circuit according to claim 3,
Be characterized in that, the full bridge inverter C include the first inverse switch pipe, the second inverse switch pipe, third inverse switch pipe and
4th inverse switch pipe；The interconnection of the drain electrode and the drain electrode of the second inverse switch pipe of the first inverse switch pipe,
The drain electrode of the source electrode of the first inverse switch pipe and the third inverse switch pipe connect and with the output filter circuit
Output inductor is connected with one end of output filter capacitor, the source electrode and the 4th inverse switch of the second inverse switch pipe
The drain electrode of pipe connects and is connected with the other end of the output filter capacitor of the output filter circuit, the third inverse switch
The source electrode of pipe is connected with the source electrode of the 4th inverse switch pipe.
5. a kind of grid-connected micro- inverter of three port inverse-excitation types with power decoupling circuit according to claim 4,
It is characterized in that, the input filter capacitor, decoupling capacitance and output filter capacitor are thin-film capacitor.
6. a kind of grid-connected micro- inverter of three port inverse-excitation types with power decoupling circuit according to claim 4,
It is characterized in that, the primary side switch pipe, secondary-side switch pipe and decoupling switching tube are HF switch pipe, the full bridge inverter C
First to fourth inverse switch pipe be power frequency switching tube, controlled by power frequency driving signal, the first inverse switch pipe and third are inverse
Become switching tube, the second inverse switch pipe and the driving of the 4th inverse switch pipe reverse phase；First inverse switch pipe and the 4th inverse switch
Pipe, the second inverse switch pipe and third inverse switch pipe driven in phase.
7. a kind of grid-connected micro- inverter of three port inverse-excitation types with power decoupling circuit according to claim 4,
It is characterized in that, the decoupling of the primary side switch pipe and secondary-side switch pipe, power decoupling circuit B of the three ports inverse-excitation converting circuit A
Switching tube, the full bridge inverter C tetra- inverse switch pipe of the first inverse switch Guan Zhi be MOSFET pipe.
8. a kind of tune of three port inverse-excitation types grid-connected micro- inverter according to claim 4 with power decoupling circuit
Method processed, which is characterized in that including following stage of modulating:
First stage, primary side switch pipe S1Conducting, solar photovoltaic assembly and decoupling capacitance are jointly to flyback transformer primary side excitation
Inductance transmits energy, and flyback transformer primary side magnetizing inductance magnetizes, and stores energy, decoupling capacitance releases energy at this time.Flyback becomes
Depressor primary side excitation inductance current increases to its peak value i from zero linearpk1:
Wherein, LmFor flyback transformer magnetizing inductance；d1For primary side switch pipe S1Duty ratio；TsFor the switch week of HF switch pipe
Phase, VpvFor the output voltage of solar photovoltaic assembly, VCDFor decoupling capacitance voltage；
Second stage, primary side switch pipe S1Shutdown, secondary-side switch pipe S2Conducting, the one of flyback transformer magnetizing inductance storage at this time
Portion of energy is transmitted to secondary side, is transferred to power grid by full bridge inverter C, and the stage ties when the energy needed for reaching power grid
Beam.At this point, secondary side output electric current reaches minimum value ipk2:
Wherein, N13For flyback transformer N1And N3Turn ratio, VgFor the amplitude of network voltage；IgFor the amplitude of power network current；It is aobvious
So, the envelope of secondary side output electric current is half-sinusoid；
Phase III, secondary-side switch pipe S2Shutdown, decoupling switch pipe S3It is connected, at this time the remaining energy of flyback transformer magnetizing inductance
Amount passes through the second primary side winding of flyback transformer N2With decoupling switching tube S3It charges to decoupling capacitance, when primary side excitation inductance current
The stage terminates when being reduced to zero, and the energy of decoupling capacitance storage can continue to encourage to flyback transformer primary side in next high frequency period
Magnetoelectricity sense is magnetized, and flyback transformer primary side excitation inductance current is i when which startspk3:
Fourth stage, primary side excitation inductance current ipk3When being reduced to zero, into fourth stage, all switching tubes are turned off at this time, instead
Violent change depressor magnetic reset.
Priority Applications (1)
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