CN107104461A - A kind of photovoltaic generating system - Google Patents
A kind of photovoltaic generating system Download PDFInfo
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- CN107104461A CN107104461A CN201710348133.1A CN201710348133A CN107104461A CN 107104461 A CN107104461 A CN 107104461A CN 201710348133 A CN201710348133 A CN 201710348133A CN 107104461 A CN107104461 A CN 107104461A
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- 238000002955 isolation Methods 0.000 claims description 25
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 11
- 238000005516 engineering process Methods 0.000 description 3
- 238000005286 illumination Methods 0.000 description 3
- 238000010248 power generation Methods 0.000 description 3
- 230000001413 cellular effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- GOLXNESZZPUPJE-UHFFFAOYSA-N spiromesifen Chemical compound CC1=CC(C)=CC(C)=C1C(C(O1)=O)=C(OC(=O)CC(C)(C)C)C11CCCC1 GOLXNESZZPUPJE-UHFFFAOYSA-N 0.000 description 1
Classifications
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- H02J3/385—
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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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
-
- 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
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
- H02S40/00—Components or accessories in combination with PV modules, not provided for in groups H02S10/00 - H02S30/00
- H02S40/30—Electrical components
- H02S40/32—Electrical components comprising DC/AC inverter means associated with the PV module itself, e.g. AC modules
-
- 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
- H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
-
- 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
- H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
- H02M1/007—Plural converter units in cascade
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Photovoltaic Devices (AREA)
- Dc-Dc Converters (AREA)
Abstract
This application discloses a kind of photovoltaic generating system, DC/DC converters including DC/AC converters and with MPPT functions, the input side joint photovoltaic array of the DC/DC converters, the DC side of DC/AC converters described in the output side joint of the DC/DC converters, the AC access power network of the DC/AC converters, wherein：The DC/AC converters are high-gain DC/AC converters, and the DC/DC converters are isolated form DC/DC converters；Or, the DC/AC converters are high-gain isolated form DC/AC converters；Or, the DC/DC converters are high-gain isolated form DC/DC converters.The application improves the voltage class of photovoltaic generating system.
Description
Technical field
The present invention relates to technical field of photovoltaic power generation, more specifically to a kind of photovoltaic generating system.
Background technology
The photovoltaic generation cost of great number is to restrict one of obstacle that photovoltaic industry is developed rapidly all the time, how effectively to reduce light
Volt cost of electricity-generating will be the core topic of following theCourse of PV Industry, and the photovoltaic generating system of higher voltage grade means
Lower photovoltaic generation cost, so it will be the key that solves the problems, such as to set up the photovoltaic generating system of higher voltage grade.
The content of the invention
In view of this, the present invention provides a kind of photovoltaic generating system, to improve the voltage class of photovoltaic generating system.
A kind of photovoltaic generating system, including DC/AC converters and the DC/DC converters with MPPT functions, the DC/DC
The input side joint photovoltaic array of converter, the DC side of DC/AC converters, institute described in the output side joint of the DC/DC converters
The AC access power network of DC/AC converters is stated, wherein：
The DC/AC converters are high-gain DC/AC converters, and the DC/DC converters are isolated form DC/DC changes
Parallel operation；
Or, the DC/AC converters are high-gain isolated form DC/AC converters；
Or, the DC/DC converters are high-gain isolated form DC/DC converters.
Wherein, the every of the high-gain DC/AC converters mutually includes each DC/AC units in multiple DC/AC units, every phase
Input side is in parallel, outlet side cascade.
Or, the isolated form DC/DC converters are topological using single stage type DC/DC, including：Multiple isolated form DC/DC become
Change unit, the photovoltaic array of the input side joint independence of each isolated form DC/DC converter units, outlet side cascade.
Wherein, the isolated form DC/DC converters are topological using single stage type DC/DC, including：Multiple isolated form DC/DC become
Unit is changed, photovoltaic array, the outlet side of the input side joint independence of each isolated form DC/DC converter units are in parallel.
Or, the isolated form DC/DC converters are topological using two-stage type DC/DC, including：Multiple prime DC/DC units
With a rear class DC/DC unit, photovoltaic array, the outlet side of the input side joint independence of each prime DC/DC units are accessed after cascading
The input side of the rear class DC/DC units, the output side joint dc bus of the rear class DC/DC units；
Each prime DC/DC units are provided with MPPT functions, and the rear class DC/DC units possess isolation features.
Wherein, the isolated form DC/DC converters are topological using two-stage type DC/DC, including：Multiple prime DC/DC units
With a rear class DC/DC unit, accessed after photovoltaic array, the outlet side of the input side joint independence of each prime DC/DC units are in parallel
The input side of the rear class DC/DC units, the output side joint dc bus of the rear class DC/DC units；
Each prime DC/DC units are provided with MPPT functions, and the rear class DC/DC units possess isolation features.
Wherein, the every of the high-gain isolated form DC/AC converters mutually includes each DC/ in multiple DC/AC units, every phase
The input side of AC units is in parallel, outlet side cascade；The DC/AC units are isolated form DC/AC units.
Wherein, the high-gain isolated form DC/DC converters are topological using single stage type, including：Multiple isolated form DC/DC are mono-
Member, the photovoltaic array of the input side joint independence of each isolated form DC/DC units, outlet side cascade.
Wherein, the high-gain isolated form DC/DC converters are using two-stage type topology, including multiple prime DC/DC units
With M rear class DC/DC module, M is positive integer, specifically：
The photovoltaic array of the input side joint independence of each prime DC/DC units, any one rear class DC/ is accessed after outlet side is in parallel
DC modules；
Each rear class DC/DC modules include multiple rear class DC/DC units, the input sides of each rear class DC/DC units is in parallel,
Outlet side is cascaded；
As M ＞ 1, the input side parallel connection of each rear class DC/DC modules, outlet side are in parallel.
Wherein, the photovoltaic generating system includes the high-gain isolated form of multiple use two-stage type topologys as disclosed above
DC/DC converters, and M ＞ 1, the outlet side of each high-gain isolated form DC/DC converters are in parallel.
Compared to traditional low pressure photovoltaic generating system, the photovoltaic generating system of higher voltage grade is required to realize
MPPT, inversion, boosting and isolation features.It can be seen from above-mentioned technical scheme that, photovoltaic generating system disclosed by the invention
MPPT functions are realized using DC/DC converters, using DC/AC convertor controls DC voltage and inversion grid connection work(are realized
Can, boost function is realized by improving the voltage gain of DC/DC converters or DC/AC converters, can be with as isolation features
Being realized in DC/DC converters can also realize in DC/AC converters, so as to complete the photovoltaic hair to higher voltage grade
The foundation of electric system.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the accompanying drawing used required in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is a kind of photovoltaic power generation system structure schematic diagram disclosed in the embodiment of the present invention；
Fig. 2 is a kind of high-gain DC/AC transformer configuration schematic diagrames disclosed in the embodiment of the present invention；
Fig. 3 is a kind of DC/AC cellular construction schematic diagrams disclosed in the embodiment of the present invention；
Fig. 4 is a kind of isolated form DC/DC transformer configuration schematic diagrames disclosed in the embodiment of the present invention；
Fig. 5 is another isolated form DC/DC transformer configuration schematic diagrames disclosed in the embodiment of the present invention；
Fig. 6 is another isolated form DC/DC transformer configuration schematic diagrames disclosed in the embodiment of the present invention；
Fig. 7 is another isolated form DC/DC transformer configuration schematic diagrames disclosed in the embodiment of the present invention；
Fig. 8 is a kind of high-gain isolated form DC/DC transformer configuration schematic diagrames disclosed in the embodiment of the present invention；
Fig. 9 is another high-gain isolated form DC/DC transformer configuration schematic diagram disclosed in the embodiment of the present invention；
Figure 10 is that one kind disclosed in the embodiment of the present invention possesses multiple high-gain isolated form DC/DC converters as shown in Figure 9
Photovoltaic power generation system structure schematic diagram.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than whole embodiments.It is based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under the premise of creative work is not made
Embodiment, belongs to the scope of protection of the invention.
Referring to Fig. 1, the embodiment of the invention discloses a kind of photovoltaic generating system, the voltage to improve photovoltaic generating system etc.
Level, the photovoltaic generating system include DC/AC converters 300 and with MPPT (Maximum Power Point Tracking, most
The tracking of high-power point) function DC/DC converters 200；
The input side joint photovoltaic array 100 of DC/DC converters 200, the output side joint DC/AC conversion of DC/DC converters 200
The DC side of device 300, the AC access power network of DC/AC converters 300；
Wherein, the particular type of DC/AC converters 200 and/or DC/DC converters 300 can use appointing in following three kinds
It is a kind of：
1) DC/AC converters 300 are high-gain DC/AC converters, and DC/DC converters 200 are isolated form DC/DC changes
Parallel operation；
2) DC/AC converters 300 are high-gain isolated form DC/AC converters；
3) DC/DC converters 200 are high-gain isolated form DC/DC converters.
Compared with traditional low pressure photovoltaic generating system, photovoltaic generating system output voltage grade disclosed in the present embodiment
Height, so needing to isolate photovoltaic side with high-pressure side.Compared to low pressure photovoltaic generating system, the photovoltaic of higher voltage grade
Electricity generation system is required to realize MPPT, inversion, boosting and isolation features.To Fig. 1 associated description, this reality more than
Apply photovoltaic generating system disclosed in example and realize MPPT functions using DC/DC converters 200, controlled directly using DC/AC converters 300
Flow side voltage and realize inversion grid connection function, by the voltage gain for improving DC/DC converters 200 or DC/AC converters 300
To realize boost function, can be realized as isolation features in DC/DC converters 200 can also be in DC/AC converters 300
Realize, so as to complete the foundation of the photovoltaic generating system to higher voltage grade.
That is, photovoltaic generating system disclosed in the present embodiment, can convert inversion, boost function in DC/AC
In device 300 realize, MPPT, isolation features are realized in DC/DC converters 200, referring to it is above-mentioned 1)；Can also be by inversion,
Boosting and isolation features are realized in DC/AC converters 300, and MPPT functions are realized in DC/DC converters 200, referring to
It is above-mentioned 2)；Can also realize inversion function in DC/AC converters 300, by MPPT, boosting and isolation features in DC/
In DC converters 200 realize, referring to it is above-mentioned 3).Explanation is needed exist for, when a certain function is in the He of DC/DC converters 200
Realized in one in DC/AC converters 300, another is only to be not necessarily to realize rather than forbid realizing the function, is illustrated
It is bright, it is above-mentioned 2) in, because DC/AC converters 300 have been realized in isolation features, therefore DC/DC converters 200 can be used
Non-isolation type can also use isolated form, to save cost, using non-isolation type.
Wherein, the structure of the high-gain DC/AC converters is as shown in Figure 2：Every phase of the high-gain DC/AC converters
Including n DC/AC unit, n is positive integer, and the input side parallel connection of each DC/AC units in every phase, outlet side are cascaded (in Fig. 2 only
The annexation between each DC/AC units in A phases is shown, B, C phase can similarly be obtained).Single DC/AC units can be using typical complete
Bridge inversion topological, its topological diagram refers to Fig. 3.
In fig. 2, because the outlet side of each DC/AC units in every phase is cascaded, so each DC/AC units in per phase
Output voltage sum is equal to the total voltage output of this phase, it is achieved thereby that high-voltage alternating is exported.Application when can directly by
The converter of high-gain DC/AC shown in Fig. 2 is connected with High-voltage AC Network, without additionally introducing the booster apparatus such as transformer again.
Alternatively, the converter of high-gain DC/AC shown in Fig. 2 is in complete machine control, in addition it is also necessary to configure a main control unit (figure
Not shown in), for realizing that the converter of high-gain DC/AC shown in Fig. 2 is alternate with phase inner equilibrium.
The isolated form DC/DC converters can be using single stage type DC/DC topologys, it would however also be possible to employ two-stage type DC/DC is opened up
Flutter.Photovoltaic array output voltage range is wide, and the wide gain isolated form DC/DC converters of single stage type are typically less efficient, but cost
It is relatively low；Prime DC/DC units in the wide gain isolated form DC/DC converters of two-stage type do not possess isolation features, only realize MPPT
Function, rear class DC/DC units realize isolation features, it can be designed and optimize to realize higher efficiency, but cost compared with
Which kind of topological isolated form DC/DC converter height, can use actually by optimum selecting as the case may be in practical application.
The specific knot of the isolated form DC/DC under single stage type DC/DC topological sum two-stage types DC/DC topologys is provided separately below
Structure, as shown in Figure 4 to 7.
As shown in figure 4, when using single stage type DC/DC topologys, the isolated form DC/DC converters include multiple isolated forms
DC/DC converter units, the photovoltaic array of the input side joint independence of each isolated form DC/DC converter units, outlet side cascade.In Fig. 4
Isolated form DC/DC converter units refer to the unit for having MPPT functions and isolation features concurrently.
Or, as shown in figure 5, when using single stage type DC/DC topologys, the isolated form DC/DC converters include multiple
Isolated form DC/DC converter units, photovoltaic array, the outlet side of the input side joint independence of each isolated form DC/DC converter units is in parallel.
Isolated form DC/DC converter units in Fig. 5 refer to the unit for having MPPT functions and isolation features concurrently.
As shown in fig. 6, when using two-stage type DC/DC topologys, the isolated form DC/DC converters include multiple primes
DC/DC units and a rear class DC/DC unit, the photovoltaic array of the input side joint independence of each prime DC/DC units, outlet side level
The input side of the rear class DC/DC units, the output side joint dc bus of the rear class DC/DC units are accessed after connection.In Fig. 6,
Each prime DC/DC units are provided with MPPT functions, and the rear class DC/DC units possess isolation features.
Or, as shown in fig. 7, when using two-stage type DC/DC topologys, the isolated form DC/DC converters include multiple
Prime DC/DC units and a rear class DC/DC unit, each single stage type isolated form DC/DC converter units input the light of side joint independence
The input side of photovoltaic array, the outlet side parallel connection access rear class DC/DC units, the output side joint of the rear class DC/DC units is straight
Flow bus.In Fig. 7, each prime DC/DC units are provided with MPPT functions, and the rear class DC/DC units possess isolation features.
Due to physical features and illumination reason, each photovoltaic module working condition can have inconsistent phenomenon in photovoltaic array,
Fig. 4~Fig. 7 is designed for varying environment condition, specifically：Structure shown in Fig. 4 and Fig. 6 is mainly used in mountain area
Deng the area that uneven illumination is even, the single photovoltaic module corresponding to each isolated form DC/DC converter units or prime DC/DC units
In the total number of photovoltaic module that includes set it is less, improve photovoltaic energy utilization rate to greatest extent to realize；Fig. 5 and Fig. 7
Shown structure is mainly used in the area of the uniform illuminations such as Plain, each isolated form DC/DC converter units or prime DC/DC units
It is more that the total number of the photovoltaic module included in corresponding single photovoltaic module is set, and had not both interfered with photovoltaic energy utilization
Rate, can save cost again.
Wherein, the every of the high-gain isolated form DC/AC converters mutually includes each DC/ in multiple DC/AC units, every phase
The input side of AC units is in parallel, outlet side cascade, to realize boost function.On this basis, to realize isolation features, in every phase
Single DC/AC units use isolated form DC/AC units.
When the DC/AC converters are high-gain isolated form DC/AC converters, the DC/DC converters only need to use
Single-stage non-isolation DC/DC converters (such as typical buck converter, boost converters or buck-boost converters),
But do not limit to.
Wherein, the high-gain isolated form DC/DC converters can be using single stage type topology, it would however also be possible to employ two-stage type is opened up
Flutter.
When using single stage type topology, as shown in figure 8, the high-gain isolated form DC/DC converters include multiple isolation
Type DC/DC units, photovoltaic array, the outlet side of the input side joint independence of each isolated form DC/DC units cascade to produce high-gain.
Isolated form DC/DC units in Fig. 8 refer to the unit for having MPPT functions and isolation features concurrently.
When using two-stage type topology, as shown in figure 9, the high-gain isolated form DC/DC converters include multiple primes
DC/DC units and M rear class DC/DC module, M is positive integer, wherein：
The photovoltaic array of the input side joint independence of each prime DC/DC units, outlet side parallel connection accesses any one rear class DC/DC
Module；Each rear class DC/DC modules include multiple rear class DC/DC units, and the input side of each rear class DC/DC units is in parallel, defeated
Go out side cascade to produce high-gain；As M ＞ 1, each rear class DC/DC modules input side is in parallel, outlet side is in parallel, to realize redundancy
Design, wherein when system generated energy is less, part rear class DC/DC units can be closed, to improve system effectiveness.
As shown in Figure 10, the present embodiment is in a photovoltaic generating system to there are multiple high-gains as shown in Figure 9 to isolate
Type DC/DC converters are as preferred (wherein M ＞ 1), and Figure 10 is only to possess two such high-gain isolated form DC/DC converters
As an example, the outlet side of each high-gain isolated form DC/DC converters is in parallel, the Redundancy Design of dc bus is now realized,
Improve system reliability.
It is further to note that when DC/DC converters use high-gain isolated form DC/DC converters, DC/AC conversion
Device is very high due to input voltage, and single topology can not realize that power is changed, it is necessary to be tied using MMC (modular multilevel technology)
Structure is realized high-voltage inverted.
In summary, photovoltaic generating system disclosed by the invention realizes MPPT functions using DC/DC converters, utilizes DC/
AC convertor controls DC voltage and inversion grid connection function is realized, by improving DC/DC converters or DC/AC converters
Voltage gain realizes boost function, and can be realized as isolation features in DC/DC converters can also be in DC/AC converters
It is middle to realize, so as to complete the foundation of the photovoltaic generating system to higher voltage grade.
The embodiment of each in this specification is described by the way of progressive, and what each embodiment was stressed is and other
Between the difference of embodiment, each embodiment identical similar portion mutually referring to.
The foregoing description of the disclosed embodiments, enables professional and technical personnel in the field to realize or using the present invention.
A variety of modifications to these embodiments will be apparent for those skilled in the art, as defined herein
General Principle can in other embodiments be realized in the case where not departing from the spirit or scope of the embodiment of the present invention.Therefore,
The embodiment of the present invention is not intended to be limited to the embodiments shown herein, and be to fit to principles disclosed herein and
The consistent most wide scope of features of novelty.
Claims (10)
1. a kind of photovoltaic generating system, it is characterised in that the DC/DC converters including DC/AC converters and with MPPT functions,
The input side joint photovoltaic array of the DC/DC converters, DC/AC converters described in the output side joint of the DC/DC converters
DC side, the AC access power network of the DC/AC converters, wherein：
The DC/AC converters are high-gain DC/AC converters, and the DC/DC converters are isolated form DC/DC conversion
Device；
Or, the DC/AC converters are high-gain isolated form DC/AC converters；
Or, the DC/DC converters are high-gain isolated form DC/DC converters.
2. photovoltaic generating system according to claim 1, it is characterised in that every phase of the high-gain DC/AC converters
Including multiple DC/AC units, the input side parallel connection of each DC/AC units in every phase, outlet side are cascaded.
3. photovoltaic generating system according to claim 1 or 2, it is characterised in that the isolated form DC/DC converters are used
Single stage type DC/DC topologys, including：Multiple isolated form DC/DC converter units, the input side joint of each isolated form DC/DC converter units
Independent photovoltaic array, outlet side cascade.
4. photovoltaic generating system according to claim 1 or 2, it is characterised in that the isolated form DC/DC converters are used
Single stage type DC/DC topologys, including：Multiple isolated form DC/DC converter units, the input side joint of each isolated form DC/DC converter units
Independent photovoltaic array, outlet side are in parallel.
5. photovoltaic generating system according to claim 1 or 2, it is characterised in that the isolated form DC/DC converters are used
Two-stage type DC/DC topologys, including：Multiple prime DC/DC units and a rear class DC/DC unit, each prime DC/DC units it is defeated
Enter the photovoltaic array of side joint independence, outlet side access rear class DC/DC units input side after cascading, the rear class DC/DC
The output side joint dc bus of unit；
Wherein, each prime DC/DC units are provided with MPPT functions, and the rear class DC/DC units possess isolation features.
6. photovoltaic generating system according to claim 1 or 2, it is characterised in that the isolated form DC/DC converters are used
Two-stage type DC/DC topologys, including：Multiple prime DC/DC units and a rear class DC/DC unit, each prime DC/DC units it is defeated
Enter the photovoltaic array of side joint independence, outlet side it is in parallel after access the input sides of the rear class DC/DC units, the rear class DC/DC
The output side joint dc bus of unit；
Wherein, each prime DC/DC units are provided with MPPT functions, and the rear class DC/DC units possess isolation features.
7. photovoltaic generating system according to claim 1, it is characterised in that the high-gain isolated form DC/AC converters
Per multiple DC/AC units are mutually included, the input side per each DC/AC units in phase is in parallel, outlet side cascade；The DC/AC
Unit is isolated form DC/AC units.
8. photovoltaic generating system according to claim 1, it is characterised in that the high-gain isolated form DC/DC converters
Using single stage type topology, including：Multiple isolated form DC/DC units, the photovoltaic of the input side joint independence of each isolated form DC/DC units
Array, outlet side cascade.
9. photovoltaic generating system according to claim 1, it is characterised in that the high-gain isolated form DC/DC converters
Using two-stage type topology, including multiple prime DC/DC units and M rear class DC/DC module, M is positive integer, wherein：
The photovoltaic array of the input side joint independence of each prime DC/DC units, any one rear class DC/DC moulds are accessed after outlet side is in parallel
Block；
Each rear class DC/DC modules include multiple rear class DC/DC units, input side parallel connection, the output of each rear class DC/DC units
Side is cascaded；
As M ＞ 1, the input side parallel connection of each rear class DC/DC modules, outlet side are in parallel.
10. photovoltaic generating system according to claim 9, it is characterised in that the photovoltaic generating system includes multiple
High-gain isolated form DC/DC converters as claimed in claim 9, and M ＞ 1, each high-gain isolated form DC/DC converters
Outlet side is in parallel.
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