CN106026742A - Multichannel photovoltaic power generation micro-inverter with high frequency isolation link - Google Patents
Multichannel photovoltaic power generation micro-inverter with high frequency isolation link Download PDFInfo
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- CN106026742A CN106026742A CN201610590075.9A CN201610590075A CN106026742A CN 106026742 A CN106026742 A CN 106026742A CN 201610590075 A CN201610590075 A CN 201610590075A CN 106026742 A CN106026742 A CN 106026742A
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- 238000002955 isolation Methods 0.000 title claims abstract description 22
- 238000010248 power generation Methods 0.000 title abstract description 7
- 230000010363 phase shift Effects 0.000 claims description 12
- 230000000712 assembly Effects 0.000 abstract 1
- 238000000429 assembly Methods 0.000 abstract 1
- 230000007547 defect Effects 0.000 abstract 1
- 238000000034 method Methods 0.000 description 11
- 235000008429 bread Nutrition 0.000 description 9
- 238000010586 diagram Methods 0.000 description 9
- 230000005611 electricity Effects 0.000 description 8
- 101100464782 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) CMP2 gene Proteins 0.000 description 5
- 101100464779 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) CNA1 gene Proteins 0.000 description 5
- 239000003990 capacitor Substances 0.000 description 4
- 238000005070 sampling Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 238000011217 control strategy Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000005284 excitation Effects 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 230000037361 pathway Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 1
- 229910010271 silicon carbide Inorganic materials 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
-
- H02J3/385—
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/14—Arrangements for reducing ripples from dc input or output
-
- 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 invention relates to a multichannel photovoltaic power generation micro-inverter with a high frequency isolation link. According to the invention, n identical high-frequency DC converter units are respectively connected to independent photovoltaic assemblies at the input ends thereof, the output ends of the n identical high-frequency DC converter units are connected with a bus in a mutually parallel manner, the bus is connected with a filter, the filter is connected with the input end of a phase inversion inverter, and the output of the phase inversion inverter is connected with a power grid, wherein n is a positive integer which is greater than or equal to 2; and each high-frequency DC converter unit comprises a high-frequency power circuit, a rectifier, and a high-frequency isolation transformer which connects the high-frequency power circuit and the rectifier. The multichannel photovoltaic power generation micro-inverter overcomes defects of low circuit utilization efficiency and high cost existing in the past. The multichannel photovoltaic power generation micro-inverter realizes electric isolation between an assembly side and a power grid side, thereby being conducive to improving the efficiency in light-load running, being capable of flexibly configuring the grid-connected power generation power level according to a power grid dispatching instruction, and realizing high efficiency, high power density and low cost of the photovoltaic power generation micro-inverter.
Description
Technical field
The invention belongs to technical field of electric power, relate to photovoltaic generation, particularly to one, there is high-frequency isolation ring
The micro-inverter of multichannel photovoltaic generation of joint.
Background technology
Power in micro-inverter, generally referred to as photovoltaic generating system is less than or equal to 1000 watts, has assembly
The inverter of level MPPT, full name is miniature photovoltaic grid-connected inverter.
Before the present invention makes, usual one piece of photovoltaic module, one micro-inverter of photovoltaic generation of configuration, and pass through
The micro-inverter of photovoltaic generation carries out independent MPPT and controls photovoltaic module, thus photovoltaic cell is greatly improved
Capacity factor, can also avoid that high direct voltage that centralized inverter has, low light level effect be poor, wooden barrel simultaneously
Effect etc..But in each piece of traditional photovoltaic module one photovoltaic generation micro-inverter scheme of configuration, each photovoltaic
Micro-inverter that generates electricity be required for a high frequency dc to dc converter unit, a set of wave filter, a set of paraphase inverter and
A set of control circuit, thus relatively costly, power density is low, if improving power density further, then and institute
Need the cost will be higher.It addition, there is also the shortcoming of photovoltaic module side maximal power tracing inefficiency,
Flyback one-level formula parallel network reverse scheme, positive and negative grid-connected current is provided respectively by two set flyback circuit, therefore this
Resolution circuitry utilization ratio is low, and relatively costly.
Visible under present circumstances, think to reduce further conventional photovoltaic and generate electricity the cost of micro-inverter, and improve
Power density is difficulty with.This situation the most seriously restricts the application of the micro-inverter of photovoltaic generation and market pushes away
Extensively.
Summary of the invention
Present invention aim to overcome that drawbacks described above, propose a kind of multichannel photovoltaic with high-frequency isolation link and send out
The micro-inverter of electricity.
The technical scheme that the present invention takes is as follows:
A kind of micro-inverter of multichannel photovoltaic generation with high-frequency isolation link, it is characterised in that this photovoltaic is sent out
The micro-inverter of electricity is mainly connected independent by n identical high frequency dc to dc converter unit at its input respectively
Photovoltaic module, is connected with bus by the way of parallel with one another at its outfan, and bus is connected with wave filter, filter
Ripple device connects the input of paraphase inverter, and the output of paraphase inverter is connected with electrical network, and n is greater than or equal to
The positive integer of 2；Each high frequency dc to dc converter unit includes: high frequency power circuit, commutator, connects high frequency
Power circuit and the high-frequency isolation transformer of commutator.
Described a kind of micro-inverter of multichannel photovoltaic generation with high-frequency isolation link, it is characterised in that be many
Block photovoltaic module shares a micro-inverter, and the micro-inverter of multichannel photovoltaic generation shares a set of wave filter, a set of
Paraphase inverter and a set of control circuit.
Described n identical high frequency dc to dc converter unit, by the high frequency dc to dc converter unit of respective passage
In, the peak point current set-point of primary side switch pipe delivers to phase-shift pulse controller, generates respective channel medium-high frequency straight
The switching tube pulse control signal v of current convertercr1、vcr2、vcr3And vcr4, then through the most available phase of drive circuit
The switching tube answering passage medium-high frequency DC converter drives signal vdr1、vdr2、vdr3And vdr4。
Use technique scheme, the beneficial effects of the present invention is:
Use the DC converter of high frequency transformer isolation, the electrical isolation of components side and grid side can be realized；High
The multi-channel straight current converter scheme of frequency isolation is conducive to the lifting of efficiency during light running, can be according to dispatching of power netwoks
Instruction flexible configuration is generated electricity by way of merging two or more grid systems power grade；Multichannel high frequency dc to dc converter is used phase-shifting control method
Can effectively reduce grid-connected current ripple, and reduce the volume of output inductor, thus reduce cost；The present invention
Middle multi-path light photovoltaic assembly shares the scheme of a micro-inverter, micro-with tradition every piece PV battery component outfit one
The way of inverter is compared, and polylith photovoltaic module shares a micro-inverter of photovoltaic generation, the micro-inversion of photovoltaic generation
Multi-channel high-frequency DC converter in device shares a set of wave filter, a set of paraphase inverter and a set of control circuit,
Certainly will can improve power density and effectively reduce cost.Therefore the circuit framework of the present invention contributes to realizing photovoltaic
Generate electricity the high efficiency of micro-inverter, high power density and low cost.The present invention is conducive to the micro-inverter of photovoltaic generation
Introduce to the market.
Other concrete advantages of the present invention and effect will go on to say below.
Accompanying drawing explanation
Fig. 1 present configuration principle schematic.
One 4 passage photovoltaic generation micro-inverter application schematic diagram of Fig. 2 present invention.
One 4 passage photovoltaic generation micro-control strategy for inverter schematic diagram of Fig. 3 present invention.
In a kind of 4 micro-inverters of passage photovoltaic generation of Fig. 4 present invention, the composition of phase-shift pulse controller is shown
It is intended to.
The high frequency displacement of phase-shift pulse controller in a kind of 4 micro-inverters of passage photovoltaic generation of Fig. 5 present invention
Phase carrier wave schematic diagram.
One 4 passage photovoltaic generation micro-inverter output current waveform 1 schematic diagram of Fig. 6 present invention.
One 4 passage photovoltaic generation micro-inverter output current waveform 2 schematic diagram of Fig. 7 present invention.
Fig. 8 specific embodiment of the invention structural principle schematic diagram.
Fig. 9 specific embodiment of the invention breaker in middle pipe drives signal experimental waveform schematic diagram.
In Figure 10 specific embodiment of the invention, paraphase inverter switching device pipe drives the signal of signal experimental waveform
Figure.
Figure 11 specific embodiment of the invention exports electric current and drives signal experimental waveform schematic diagram.
Grid-connected current and line voltage experimental waveform schematic diagram in Figure 12 specific embodiment of the invention.
In figure, each label represents that corresponding component names is as follows:
1# photovoltaic module 1,2# photovoltaic module 2, n# photovoltaic module 3,1# high frequency dc to dc converter unit 4,2#
High frequency dc to dc converter unit 5, n# high frequency dc to dc converter unit 6, bus 7, wave filter 8, paraphase inversion
Device 9, low voltage electric network 10,3# high frequency dc to dc converter unit 11,4# high frequency dc to dc converter unit 12,3#
Photovoltaic module 13,4# photovoltaic module 14.
Designation in Fig. 1:
| Cf | Output filter capacitor | vg | Low voltage electric network voltage | |
| Lf1, Lf2 | Output inductor | T1 | High-frequency isolation transformer |
Designation in Fig. 2:
Designation in Fig. 3:
Designation in Fig. 4:
| CMP1 | Comparator 1 | CMP2 | Comparator 2 | |
| CMP3 | Comparator 3 | CMP4 | Comparator 4 | |
| Vcar1 | High frequency carrier 1 | Vcar2 | High frequency carrier 2 | |
| Vcar3 | High frequency carrier 3 | Vcar4 | High frequency carrier 4 |
The same Fig. 3 of other symbol.
Designation in Fig. 5:
| θ | Phase shifting angle |
The same Fig. 4 of other symbol.
Designation in Fig. 6:
Same Fig. 6 of symbol in Fig. 7.
Symbol in Fig. 8 is with Fig. 2 and Fig. 3.
Symbol in Fig. 9, Figure 10, Figure 11 and Figure 12 is with figure.
Detailed description of the invention
The specific implementation method of the present invention is described in detail below in conjunction with technical scheme and accompanying drawing.By Fig. 1
With the parts of Fig. 2: the present invention are by 1# photovoltaic module 1,2# photovoltaic module 2,3# photovoltaic module 13,4# photovoltaic
Assembly 14, n# photovoltaic module 3,1# high frequency dc to dc converter unit 4,2# high frequency dc to dc converter unit 5,
3# high frequency dc to dc converter unit 11,4# high frequency dc to dc converter unit 12, n# high frequency dc to dc converter unit
6, bus 7, wave filter 8, paraphase inverter 9 and low voltage electric network 10 are constituted.This photovoltaic generation visible is micro-inverse
Become device mainly straight by 1# high frequency dc to dc converter unit 4,2# high frequency dc to dc converter unit 5 ..., n# high frequency
Current converter unit 6 (n unit altogether) connects 1# photovoltaic module 1,2# photovoltaic module respectively at its input
2 ..., n# photovoltaic module 3, and at its outfan by commutator such as D11Etc. being connected to bus 7, bus 7
With the filter capacitor C in wave filter 8 circuitf, filter inductance Lf1And Lf2Be connected, wave filter again with paraphase inversion
Being connected of device, the brachium pontis midpoint output of paraphase inverter is connected with low voltage electric network, and n is just being greater than or equal to 2
Integer；1# high frequency dc to dc converter unit 4 includes: high frequency power circuit, commutator, and connects high frequency power
Circuit and high-frequency isolation transformer T of commutator1, other high frequency dc to dc converter unit has same structure.Figure
Understanding in 1 and Fig. 2, the circuit framework of the present invention shares a set of wave filter and a set of paraphase inverter, polylith light
Photovoltaic assembly shares a micro-inverter of photovoltaic generation, thus the cost of specific power density is decreased obviously.
It is one 4 passage photovoltaic generation micro-inverter application of the present invention as shown in Figure 2, wherein high-frequency direct-current
Power converter cells all uses flyback circuit, the control strategy of Fig. 3 produce and drive signal.1# high-frequency direct-current becomes
Exchange unit 4,2# high frequency dc to dc converter unit 5,3# high frequency dc to dc converter unit 11 and 4# high frequency are straight
The input of current converter unit 12 connects 1# photovoltaic module 1,2# photovoltaic module 2,3# photovoltaic module respectively
13 and 4# photovoltaic modulies 14, flyback high frequency dc to dc converter outfan parallel connection forms bus 7；1# high frequency is straight
Switching tube Q in current converter unit 41Driving signal be vdr1, in 2# high frequency dc to dc converter unit 5
Switching tube drives signal to be vdr2, the switching tube in 3# high frequency dc to dc converter unit 11 drives signal to be vdr3, 4#
Switching tube in high frequency dc to dc converter unit 12 drives signal to be vdr4。
Fig. 3 gives Fig. 2 control method of application, the low voltage electric network voltage signal v in Fig. 3gSampled and
Modulate circuit delivers to phaselocked loop, and exports lockin signal PLL, for flyback high frequency dc to dc converter, and this lock
Phase signals is sinusoidal steamed bread waveform, and frequency is 2 times of electrical network power frequency.Sampling obtains 1# photovoltaic module 1,2#
Photovoltaic module 2, the output voltage of 3# photovoltaic module 13 and 4# photovoltaic module 14 are V respectivelypv1、Vpv2、Vpv3、
And Vpv4；Sampling obtains 1# photovoltaic module 1,2# photovoltaic module 2,3# photovoltaic module 13 and 4# photovoltaic module
The output electric current of 14 is I respectivelypv1、Ipv2、Ipv3, and Ipv4.By Vpv1And Ipv1Through 1#MPPT controller to 1#
Photovoltaic module 1 implements MPPT maximum power point tracking control, the former limit of available 1# high frequency dc to dc converter unit 4
Switching tube peak point current maximum Ip1_CMD；By Vpv2And Ipv2Real to 2# photovoltaic module 2 through 2#MPPT controller
Execute MPPT maximum power point tracking control, the primary side switch pipe peak electricity of available 2# high frequency dc to dc converter unit 5
Stream maximum Ip2_CMD；By Vpv3And Ipv3Through 3#MPPT controller, 3# photovoltaic module 13 is implemented maximum power point
Tracing control, the primary side switch pipe peak point current maximum I of available 3# high frequency dc to dc converter unit 11p3_CMD；
By Vpv4And Ipv4Through 4#MPPT controller, 4# photovoltaic module 14 is implemented MPPT maximum power point tracking control, can obtain
Primary side switch pipe peak point current maximum I to 4# high frequency dc to dc converter unit 12p4_CMD；Respective passage is obtained
The primary side switch pipe peak point current maximum I arrivedp1_CMD、Ip2_CMD、Ip3_CMD、Ip4_CMDWith the phase-locked letter from electrical network
Number PLL phase respectively obtains limit, 1# high frequency dc to dc converter unit 4 Central Plains peak point current set-point I at conveniencep1_ref、
Limit, 2# high frequency dc to dc converter unit 5 Central Plains peak point current set-point Ip2_ref, 3# high frequency dc to dc converter unit
11 limit, Central Plains peak point current set-point Ip3_ref, and limit, 4# high frequency dc to dc converter unit 12 Central Plains peak point current
Set-point Ip4_ref, the primary side switch pipe peak point current set-point of respective passage is delivered to phase-shift pulse controller,
Generate the switching tube pulse control signal v of respective channel medium-high frequency DC convertercr1、vcr2、vcr3And vcr4, then
Switching tube driving signal v through the most available respective channel medium-high frequency DC converter of drive circuitdr1、vdr2、vdr3
And vdr4, thus control the opening and closing of corresponding high frequency dc to dc converter breaker in middle pipe.
Phase-shift pulse controller in Fig. 3 is mainly made up of comparator, operation principle as shown in Figure 4, Fig. 4
In the output of comparator CMP1, CMP2, CMP3 and CMP4 be used for generating in high frequency dc to dc converter unit and opening
Close the pulse control signal of pipe.It is high that the in-phase end of comparator CMP1, CMP2, CMP3 and CMP4 meets 1# respectively
Frequently limit, ITVDC converter unit 4 Central Plains peak point current set-point Ip1_ref, in 2# high frequency dc to dc converter unit 5
Former limit peak point current set-point Ip2_ref, limit, 3# high frequency dc to dc converter unit 11 Central Plains peak point current set-point
Ip3_ref, and limit, 4# high frequency dc to dc converter unit 12 Central Plains peak point current set-point Ip4_ref；Comparator CMP1,
The end of oppisite phase of CMP2, CMP3 and CMP4 meets phase shift high-frequency carrier signal V respectivelycar1、Vcar2、Vcar3And Vcar4。
Through comparator CMP1, CMP2, CMP3 and CMP4 relatively after output obtain respective channel medium-high frequency DC converter
Switching tube pulse control signal vcr1、vcr2、vcr3And vcr4.High-frequency carrier signal in Fig. 4 as it is shown in figure 5,
High-frequency carrier signal Vcar1、Vcar2、Mcar3And Vcar4Phase shift θ electrolysis degree successively.One electrical angle cycle is 360
Degree, then for the micro-inverter of the photovoltaic generation of 4 passages in Fig. 2, the phase shifting angle θ of phase shift high frequency carrier
Should be equal to 90 degree.If being easy to conclude that the micro-inverter of photovoltaic generation of n-channel, phase shift high frequency carries
The phase shifting angle θ of ripple should spend equal to (360/n).
It is apparent from by above-mentioned analysis, if the frequency of phase shift high frequency carrier is fixed, then passage medium-high frequency DC converter
Switching tube drives signal vdr1、vdr2、vdr3And vdr4Pulse width will comply with sinusoidal steamed bread wave modulation, thus
The primary current i of 1# high frequency dc to dc converterp1Envelope be sinusoidal steamed bread ripple, therefore meansigma methods is sinusoidal steamed bread
Ripple, equally, the primary current meansigma methods of other passage medium-high frequency DC converter is also sinusoidal steamed bread ripple；By height
Frequently isolating transformer ampere-turn relation, learns the secondary current i of high frequency dc to dc converters1、is2、is3And is4Bag
Winding thread and meansigma methods are also sinusoidal steamed bread ripples；The secondary current of all passage medium-high frequency DC converters is added and obtains
Inductive current i in wave filter 8o, it is clear that it is a sinusoidal steamed bread ripple, and frequency is 2 times of electrical network power frequency.
The in-phase end of the lockin signal PLL connection zero-crossing comparator CMP of Fig. 3 Medial & Low Voltage Power Network, end of oppisite phase ground connection,
Then zero-crossing comparator CMP exports square-wave signal, and frequency is electrical network power frequency component, and described square-wave signal drives through paraphase
Dynamic circuit evolving paraphase inverter breaker in middle pipe Qn1、Qn2、Qn3And Qn4Driving signal, respectively vnd1、vnd2、
vnd3And vnd3, wherein vnd1And vnd4Signal is identical, vnd2And vnd3Signal is identical, thus by sine steamed bread ripple io
Carry out paraphase, obtain grid-connected current ig。
As described in Figure 2 during any one channels operation in 4 passages, the electric current i in filter inductanceoOne
Surely it is interrupted.If the high frequency dc to dc converter in described 4 passages is all operated in equal-wattage, and peak, former limit
Value given value of current value Ip1_ref、Ip1_ref、Ip1_refAnd Ip1_refIdentical, then use phase shift as shown in Figure 5 90 degree
After high frequency carrier modulation, the secondary current waveform i of high frequency dc to dc converters1、is2、is3、is4And filter inductance
Lf1And Lf2Middle electric current ioAs shown in Figure 6, it is clear that output current ratio when working with single channel relatively, filtered electrical
Sense Lf1And Lf2Middle electric current ioRipple frequency be 4 times of switching frequency, and ioIt it is continuous print；If equivalence Cheng Shuan
Power grade during channels operation, can obtain output current wave as shown in Figure 7, as can be seen from Fig. 7: 4
When passage works simultaneously, Lf1And Lf2Middle ioCurrent ripples compared to the dual pathways work output current ripples,
Such as is1And is3Current ripples, little half.It is readily available a conclusion: if the micro-inversion of photovoltaic generation
N in device identical high frequency dc to dc converter unit works simultaneously, uses phase-shifting control method, i.e. uses
(360/n) the phase shift high frequency carrier modulation spent, then the current ripples frequency in output inductor will be single channel
During work n times of output current ripple frequency, and current ripples will obtain bigger suppression, can obtain low current
The grid-connected current of ripple, now output inductor Lf1And Lf2Less numerical value and volume can be taken, thus subtract
The volume of the micro-inverter of little photovoltaic generation and cost.
Above-described control method can be realized by one piece of digital control chip and peripheral circuit thereof, i.e. this
Bright described a kind of micro-inverter of multichannel photovoltaic generation with high-frequency isolation link, is that polylith photovoltaic module is total to
With a micro-inverter, the micro-inverter of multichannel photovoltaic generation shares a set of wave filter 8, a set of paraphase inverter
9 and a set of control circuit, thus specific power density low cost, and there is high power density.
Embodiment:
It is as follows that of the present invention is embodied as example:
Photovoltaic generation micro-inverter circuit principle schematic such as Fig. 8 of one 4 passage with high-frequency isolation link
Shown in, the top half in Fig. 8 is the same with Fig. 2, by parts 1# photovoltaic module 1,2# photovoltaic module 2,3#
Photovoltaic module 13,4# photovoltaic module 14,1# high frequency dc to dc converter unit 4,2# high frequency dc to dc converter list
Unit 5,3# high frequency dc to dc converter unit 11,4# high frequency dc to dc converter unit 12, bus 7, wave filter 8,
Paraphase inverter 9 and low voltage electric network 10 are constituted.The latter half is control circuit, by parts modulate circuit 15,
AD thief hatch 16, MPPT controller 17, multiplier 18, EPWM mouth 19, phaselocked loop 20, zero-crossing comparator
21, I/O mouth 22, drive circuit 24 and paraphase drive circuit 25 are constituted, wherein AD thief hatch 16, MPPT
Controller 17, multiplier 18, EPWM mouth 19, phaselocked loop 20, zero-crossing comparator 21, I/O mouth 22 parts
Being by the hardware and software programming realization within digital signal processor DSP 23, DSP here selects TI
The DSP TMS320F28035 of company, high frequency dc to dc converter unit uses flyback main circuit.
The voltage V of 4 road photovoltaic modulies in main circuitpv1、Vpv2、Vpv3、、Vpv4, the output of 4 road photovoltaic modulies
Electric current Ipv1、Ipv2、Ipv3、Ipv4, and low voltage electric network voltage vgIt is sampled and delivers to modulate circuit, then through DSP 23
AD thief hatch 16 deliver to the inside of DSP 23；Vpv1And Ipv1、Vpv2、Vpv3、、Vpv4By Vpv1And Ipv1Warp
1# photovoltaic module 1 is implemented MPPT maximum power point tracking control by MPPT controller 17, available 1# high-frequency direct-current
The former limit peak point current maximum I of power converter cells 4p1_CMD；By Vpv2And Ipv2Through MPPT controller 17 to 2#
Photovoltaic module 2 implements MPPT maximum power point tracking control, the former limit of available 2# high frequency dc to dc converter unit 5
Peak point current maximum Ip2_CMD；By Vpv3And Ipv3Through MPPT controller 17,3# photovoltaic module 13 is implemented
High-power some tracing control, the former limit peak point current maximum of available 3# high frequency dc to dc converter unit 11
Ip3_CMD；By Vpv4And Ipv4Through MPPT controller 17,4# photovoltaic module 14 is implemented MPPT maximum power point tracking control,
The former limit peak point current maximum I of available 4# high frequency dc to dc converter unit 12p4_CMD；Here MPPT control
Device 17 processed is by 1#MPPT controller as shown in Figure 3,2#MPPT controller, 3#MPPT controller and 4#MPPT
Controller is constituted.Low voltage electric network voltage vgLockin signal PLL is obtained through phaselocked loop 20 in DSP 23 inside, this
In phaselocked loop 20 be the digital phase-locked loop realized by software programming.
Multiplier 18 is made up of 4 multipliers as shown in Figure 3, and EPWM mouth 19 is then DSP 23
(TMS320F28035) the enhancement mode PWM generator in, the programmed shifting realized as described in Fig. 4 and Fig. 5
Phase impulse controller function, phase shifting angle θ=90 degree, the output of multiplier 18 send EPWM mouth 19 to generate accordingly
The pulse control signal v of 4 passage flyback high frequency dc to dc converter breaker in middle pipescr1、vcr2、vcr3And vcr4, then
Just the driving signal v of corresponding high frequency dc to dc converter unit breaker in middle pipe is obtained through drive circuit 24dr1、vdr2、
vdr3And vdr4.And the lockin signal PLL of phaselocked loop output is through zero-crossing comparator 21, exportable paraphase inverter
The industrial frequency control signal of breaker in middle pipe, industrial frequency control signal is exported by I/O mouth 22 parts of DSP 23, through falling
Phase drive circuit 25 produces the driving signal v of paraphase inverter breaker in middle pipend1、vnd2、vnd3And vnd4, wherein
vnd1And vnd4Signal is identical, vnd2And vnd3Signal is identical.
Fig. 8 example peak power is 1000W, in 1# passage, assembly use STC power bracket 180～
280Wp, maximum DC input voitage 55V, direct current startup voltage 28V, MPPT voltage range 22～45V,
Big direct current input current is 10A, and maximum direct-current short circuit electric current is 12A.Passage 1 circuit of reversed excitation in example
Switching tube Q1Select the BSC190N15NS3G (rated current and voltage are 50A/150V), C of Infineoni1Adopt
In parallel with the electrochemical capacitor of 5 2200 μ F/63V, C11Capacitance is 2.2nF, and the high-frequency isolation transformer turn ratio is
2: 12, current transformer TR11Selecting the PA1005 of line skill, the turn ratio on former and deputy limit is 1: 200, D21Type
Number it is MBR120VLSFT1G, sampling resistor R11=3, current-limiting resistance Rg1=3, bleeder resistance R21=10k,
Commutation diode D11 select Cree company silicon carbide diode C4D02120A (rated current and voltage are
5.9A/1200V)；The main circuit parts selection of other 3 passage medium-high frequency ITVDC converter unit leads to 1#
Road.The filter capacitor C of Fig. 8 median filter 8f=47nF, filter inductance Lf1=Lf2=100 μ H, paraphase inverter
In switching tube Qn1～Qn4Select controllable silicon S8008D (rated current and voltage are 8A/800V), low tension
Net voltage vgSpecified virtual value is 230V, and frequency is 50Hz.Arranging switching frequency 110kHz, circuit of reversed excitation is pressed
Discontinuous current designs.
Drive circuit 24 in Fig. 8 uses the UCD7100 of TI company, and its 8 tape has overcurrent protection function,
For 1# passage, can be by main circuit switch pipe Q1Current sampling signal ip18 feet introducing UCD7100 are implemented
Overcurrent protection, other 3 passage also similar process；The optocoupler MOC3052 of fairchild selected by paraphase drive circuit 25
Constitute, produce and drive signal vnd1And vnd, vnd2And vnd3。
Fig. 9 show the switching tube drive signal waveform of 4 road flyback high frequency dc to dc converter, wherein passage 2
For vdr1Waveform, passage 4 is vdr2Waveform, passage 1 is vdr3Waveform, passage 3 is vdr4Waveform.
As seen from the figure, 90 degree of phase shifting control of 4 channel driving signals are achieved by DSP 23 main control chip.
Figure 10 show in rear class paraphase full-bridge inverter 9 two controllable silicon driving voltage waveforms of brachium pontis,
Wherein CH2 passage is Qn1The drive waveforms of (on the left of brachium pontis), CH1 passage is Qn2Driving of (on the right side of brachium pontis)
Dynamic waveform.Operating frequency is with the frequency of low voltage electric network, for 50Hz.
Steady Experimental waveform when Figure 11 show that in Fig. 8,4 passages all work, passage 1 is filter inductance
Lf1Upper measured current ioWaveform, passage 2 is the drive waveforms of 1# high frequency dc to dc converter breaker in middle pipe.By leading to
The experimental waveform in road 1 is visible, and output electric current is sinusoidal steamed bread ripple, and current ripples is less.
Grid-connected current when Figure 12 show fully loaded work and grid voltage waveform.Known by figure, use the present invention
Photovoltaic generation micro-inverter scheme, full load output current waveform can well follow the tracks of line voltage
Phase place, and current distortion is less.
Embodiment is 4 road photovoltaic modulies have shared the 4 micro-inverters of passage photovoltaic generation, 4 invented
The micro-inverter of passage photovoltaic generation by after bus parallel connection, is shared one by 4 flyback high frequency dc to dc converter
Wave filter and a paraphase inverter, and only need a digitial controller, i.e. share a set of control circuit, therefore phase
For 4 traditional road photovoltaic modulies need 4 micro-inverters of independent photovoltaic generation, the photovoltaic invented
Micro-inverter that generates electricity has high power density and low cost.Multichannel photovoltaic generation micro-inverter framework of invention is not
It is only applicable to the grid-connected Miniature inverter of flyback, and is applicable to the grid-connected Miniature inverter of all High Frequency Links.
Knowable to above description, a kind of micro-inversion of multichannel photovoltaic generation with high-frequency isolation link of invention
Device, has the advantage that
(1) filter inductance in wave filter can take smaller value, reduces cost while improving power density；
(2) multiple high frequency dc to dc converter by share after bus parallel connection a wave filter, paraphase inverter,
With a control circuit, improve specific power density, and reduce the cost of specific power density；
(3) main circuit of the micro-inverter of multichannel photovoltaic generation is because sharing a control circuit, therefore easily realizes multichannel
Communication in photovoltaic module power generation process and co-ordination.
The invention is not limited in above-described embodiment, on the basis of technical scheme disclosed by the invention, this area
Technical staff according to disclosed technology contents, it is not necessary to performing creative labour just can be to some of which skill
Art feature is made some and is replaced and deformation, and these are replaced and deformation is the most within the scope of the present invention.
Claims (3)
1. the micro-inverter of multichannel photovoltaic generation with high-frequency isolation link, it is characterised in that identical by n
High frequency dc to dc converter unit, connect independent photovoltaic module respectively at its input, pass through at its outfan
Mode parallel with one another is connected with bus, and bus is connected with wave filter, and wave filter connects the input of paraphase inverter
End, the output of paraphase inverter is connected with electrical network；Described n is greater than or equal to the positive integer of 2；Each high frequency
ITVDC converter unit includes: high frequency power circuit, commutator, connects the height of high frequency power circuit and commutator
Frequently isolating transformer.
A kind of micro-inverter of multichannel photovoltaic generation with high-frequency isolation link the most according to claim 1,
It is characterized in that, described polylith photovoltaic module shares a micro-inverter, and the micro-inverter of multichannel photovoltaic generation is altogether
By a set of wave filter, a set of paraphase inverter and a set of control circuit.
A kind of micro-inverter of multichannel photovoltaic generation with high-frequency isolation link the most according to claim 1,
It is characterized in that, by the high frequency dc to dc converter unit of respective passage, the peak point current of primary side switch pipe gives
Value delivers to phase-shift pulse controller, generates the switching tube pulse control signal of respective channel medium-high frequency DC converter
vcr1、vcr2、vcr3And vcr4, then the switch through the most available respective channel medium-high frequency DC converter of drive circuit
Pipe drives signal vdr1、vdr2、vdr3And vdr4。
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106712554A (en) * | 2016-12-30 | 2017-05-24 | 深圳茂硕电气有限公司 | High-frequency-link tandem type inverter topological structure |
| CN109524996A (en) * | 2019-01-17 | 2019-03-26 | 浙江恩沃新能源科技有限公司 | A kind of miniature photovoltaic DC-to-AC converter |
| CN114328597A (en) * | 2021-12-28 | 2022-04-12 | 上海上电电力工程有限公司 | Method and device for calculating power increasing amount of photovoltaic power station, server and storage medium |
| WO2024082715A1 (en) * | 2022-10-18 | 2024-04-25 | 华为数字能源技术有限公司 | Power conversion system and ripple current suppression method therefor |
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| CN102624264A (en) * | 2011-01-30 | 2012-08-01 | 上海康威特吉能源技术有限公司 | Multiple-input fly-back photovoltaic grid-connected inverter |
| CN103001472A (en) * | 2011-09-14 | 2013-03-27 | 厦门蓝溪科技有限公司 | Miniature intelligent converter and method for controlling same |
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| CN201550052U (en) * | 2009-10-12 | 2010-08-11 | 国琏电子（上海）有限公司 | Solar power supply system |
| CN102624264A (en) * | 2011-01-30 | 2012-08-01 | 上海康威特吉能源技术有限公司 | Multiple-input fly-back photovoltaic grid-connected inverter |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106712554A (en) * | 2016-12-30 | 2017-05-24 | 深圳茂硕电气有限公司 | High-frequency-link tandem type inverter topological structure |
| CN109524996A (en) * | 2019-01-17 | 2019-03-26 | 浙江恩沃新能源科技有限公司 | A kind of miniature photovoltaic DC-to-AC converter |
| CN114328597A (en) * | 2021-12-28 | 2022-04-12 | 上海上电电力工程有限公司 | Method and device for calculating power increasing amount of photovoltaic power station, server and storage medium |
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