CN106230285A - A kind of group string data photovoltaic DC-to-AC converter topological structure - Google Patents
A kind of group string data photovoltaic DC-to-AC converter topological structure Download PDFInfo
- Publication number
- CN106230285A CN106230285A CN201610578513.XA CN201610578513A CN106230285A CN 106230285 A CN106230285 A CN 106230285A CN 201610578513 A CN201610578513 A CN 201610578513A CN 106230285 A CN106230285 A CN 106230285A
- Authority
- CN
- China
- Prior art keywords
- photovoltaic
- group string
- string data
- topological structure
- inverter circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Photovoltaic Devices (AREA)
Abstract
The present invention open one group string data photovoltaic DC-to-AC converter topological structure, including n inverter circuit, inverter circuit uses single stage type inverter circuit, n inverter circuit AC parallel connection, and DC side is mutually isolated, and respectively with n the corresponding connection of photovoltaic group string, n is positive integer.This kind of topological structure can effectively promote inverter conversion efficiency on the premise of not affecting group string inverter multichannel maximal power tracing function.
Description
Technical field
The present invention relates to a kind of circuit topological structure, particularly to one group string data photovoltaic DC-to-AC converter topological structure.
Background technology
In photovoltaic generating system, single photovoltaic cell assembly peak power is usually about 250W, and open-circuit voltage is usual
It is 35～about 40V, about 20 photovoltaic cell components series connection of on-the-spot generally employing, form a photovoltaic group string.Centralized light
In overhead utility, multiple photovoltaic group string form two-stage direct current and conflux through photovoltaic combiner box, photovoltaic DC power distribution cabinet, then by collection
Chinese style photovoltaic inverter grid-connected generates electricity；In distributed photovoltaic power station, usual multiple photovoltaic group string, without confluxing, are directly accessed little
Power inverter realizes generating electricity by way of merging two or more grid systems, and this small-power inverter is referred to as group string data photovoltaic DC-to-AC converter.
Group string data photovoltaic DC-to-AC converter is owing to having multichannel independence maximal power tracing (MPPT) function, DC voltage adaptability
By force, specific aim can improve the mismatch problems in parallel between different photovoltaic group string, thus be widely applied, not only widely apply
In distributed photovoltaic power station, the most gradually batch is applied to the centralized photovoltaic plant of large-scale ground.
The group string data photovoltaic DC-to-AC converter of application mainly uses the following two kinds topological at present:
As it is shown in figure 1, the first topology of group string data photovoltaic DC-to-AC converter uses two-stage type structure, the direct current input of photovoltaic group string
After first passing through the DC/DC translation circuit of the first order, then the DC/AC inverter circuit through the second level, it is transformed to exchange output.Generally
The DC/DC translation circuit of previous stage completes photovoltaic maximal power tracing (MPPT) function, owing to the DC/DC of each branch road converts electricity
Road is separate, thus this topological structure possesses photovoltaic group string direct current and inputs each road independence maximal power tracing (MPPT) merit
Energy.
But, owing to using two-stage type structure, inverter efficiency can reduce further, according to advanced level the most in the industry,
Assuming that prime DC/DC efficiency reaches 99%, rear class DC/AC efficiency also reaches 99%, does not consider shunt loss, ideal situation subinverse
Becoming device complete machine peak efficiency and be only 99%*99%=98.01%, comparatively speaking, inverter conversion efficiency is relatively low.
As in figure 2 it is shown, group string data photovoltaic DC-to-AC converter the second topological structure uses single stage type structure, the direct current of photovoltaic group string
Input the DC/AC inverter circuit through single-stage, directly the direct current energy that photovoltaic group string inputs is changed to AC energy output.By
Converting in only one-level DC/AC, power loss is little, and inverter conversion efficiency is compared two-stage type and can be made higher, according at present
Advanced level in the industry, single-stage group string data photovoltaic DC-to-AC converter peak efficiency has reached 99%.
But, owing to this topological structure only has one-level DC/AC of single channel to convert, can only be to each photovoltaic group string parallel connection after
Total direct current input carries out power tracking, thus does not possess multichannel stand alone type maximal power tracing (MPPT) function, for directly
Mismatch in parallel between each photovoltaic group string accessed, does not the most possess difference and follows the tracks of to improve the ability of power loss, thus also
There is certain application limitation.
Summary of the invention
The purpose of the present invention, is to provide a kind of group string data photovoltaic DC-to-AC converter topological structure, and it can not affect group string data
On the premise of inverter multichannel maximal power tracing function, effectively promote inverter conversion efficiency.
In order to reach above-mentioned purpose, the solution of the present invention is:
A kind of group string data photovoltaic DC-to-AC converter topological structure, including n inverter circuit, n inverter circuit AC is in parallel, directly
The connection corresponding with n photovoltaic group string respectively of stream side, n is positive integer.
Above-mentioned n inverter circuit DC side is mutually isolated.
Above-mentioned inverter circuit uses single stage type inverter circuit.
Above-mentioned group of string data photovoltaic DC-to-AC converter uses 24kW three-phase group string data photovoltaic DC-to-AC converter.
Above-mentioned 24kW three-phase group string data photovoltaic DC-to-AC converter comprises 4 6kW three-phase inverters, 4 6kW three-phase inverter exchanges
Side is in parallel, and DC side connects the photovoltaic cell group string of the 1 following capacity of road 6kW respectively.
After using such scheme, the invention have the characteristics that:
(1) separate due to each inverter circuit of DC side, thus each inverter circuit can be individually to the photovoltaic inputted
Direct current energy carries out maximal power tracing (MPPT)；
(2) owing to have employed efficient single stage type inverter circuit structure, group string inverter overall transformation loss is little, efficiency
Higher；
(3) present invention realizes multichannel independence maximal power tracing (MPPT) by the DC/AC inverter circuit of each branch road independence
Function, each branch road all uses single stage type DC/AC inverter circuit, and conversion efficiency is high, and principle is simple, it is convenient to realize.
Accompanying drawing explanation
Fig. 1 is the topology diagram of a kind of existing group of string data photovoltaic DC-to-AC converter；
Fig. 2 is the topology diagram of another kind of existing group of string data photovoltaic DC-to-AC converter；
Fig. 3 is the topology diagram of the present invention；
Fig. 4 is the enforcement structural representation of the present invention；
Detailed description of the invention
Below with reference to accompanying drawing, technical scheme is described in detail.
As it is shown on figure 3, the present invention provides a kind of group string data photovoltaic DC-to-AC converter topological structure, include one or more inversion
Circuit, this inverter circuit is single stage type inverter circuit, is constituted basic standard module with standard single stage type inverter circuit, and each is basic
Standard module AC is directly parallel in together, constitutes ac output end；Each basic standard module DC side is mutually isolated, point
Do not access respective photovoltaic group string.So, the photovoltaic group string power of each input is carried out independent by each basic standard module
Maximal power tracing (MPPT), whole photovoltaic DC-to-AC converter can complete multichannel MPPT function.And owing to DC side modules is mutual
Between isolate, even if therefore AC each basic standard module is the most in parallel, also cannot form zero sequence circulation flow path, whole photovoltaic
Each basic standard module of inverter can be the most properly functioning.
Fig. 4 is the modular design that the present invention is applied to reality, and a 24kW three-phase group string data photovoltaic DC-to-AC converter uses
6kW three-phase inverter constitutes basic standard module, and each standard module can access the photovoltaic cell group of the 1 following capacity of road 6kW
String.Whole group string inverter is made up of 4 standard 6kW three-phase inverters, and each inverter ac side is the most in parallel, DC side
Separate, isolation.Whole photovoltaic DC-to-AC converter DC side can be accessed by the photovoltaic cell group string of the 4 following capacity of road 6kW, possesses 4 tunnels
Independent MPPT function.
Summary, one group string data photovoltaic DC-to-AC converter topological structure of the present invention, have multichannel independence maximal power tracing concurrently
(MPPT) advantage of both function and single stage type inverter circuit conversion efficiency height.The present invention the most easily realizes, low cost, not
On the premise of affecting multichannel maximal power tracing (MPPT) function, the generating effect of group string data photovoltaic DC-to-AC converter can be effectively improved
Rate, improves photovoltaic generating system benefit.
Above example is only the technological thought that the present invention is described, it is impossible to limit protection scope of the present invention with this, every
The technological thought proposed according to the present invention, any change done on the basis of technical scheme, each fall within scope
Within.
Claims (5)
1. a group string data photovoltaic DC-to-AC converter topological structure, it is characterised in that: include n inverter circuit, n inverter circuit exchange
Side is in parallel, DC side respectively with n the corresponding connection of photovoltaic group string, n is positive integer.
2. a kind of group string data photovoltaic DC-to-AC converter topological structure as claimed in claim 1, it is characterised in that: described n inversion electricity
Road DC side is mutually isolated.
3. a kind of group string data photovoltaic DC-to-AC converter topological structure as claimed in claim 1, it is characterised in that: described inverter circuit is adopted
Use single stage type inverter circuit.
4. a kind of group string data photovoltaic DC-to-AC converter topological structure as claimed in claim 1, it is characterised in that: described group of string data photovoltaic
Inverter uses 24kW three-phase group string data photovoltaic DC-to-AC converter.
5. a kind of group string data photovoltaic DC-to-AC converter topological structure as claimed in claim 4, it is characterised in that: described 24kW three-phase group
String data photovoltaic DC-to-AC converter comprises 4 6kW three-phase inverters, and 4 6kW three-phase inverter ACs are in parallel, and DC side connects 1 respectively
The photovoltaic cell group string of the following capacity of road 6kW.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610578513.XA CN106230285A (en) | 2016-07-21 | 2016-07-21 | A kind of group string data photovoltaic DC-to-AC converter topological structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610578513.XA CN106230285A (en) | 2016-07-21 | 2016-07-21 | A kind of group string data photovoltaic DC-to-AC converter topological structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106230285A true CN106230285A (en) | 2016-12-14 |
Family
ID=57531138
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610578513.XA Pending CN106230285A (en) | 2016-07-21 | 2016-07-21 | A kind of group string data photovoltaic DC-to-AC converter topological structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106230285A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106788216A (en) * | 2017-02-10 | 2017-05-31 | 阳光电源股份有限公司 | A kind of photovoltaic inverting system and photovoltaic inversion method |
| CN108539782A (en) * | 2018-04-03 | 2018-09-14 | 阳光电源股份有限公司 | A kind of photovoltaic generating system |
| CN112305308A (en) * | 2020-10-21 | 2021-02-02 | 阳光电源股份有限公司 | Direct-current arc detection method and device and string inverter |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203368361U (en) * | 2013-08-03 | 2013-12-25 | 阳光电源股份有限公司 | Photovoltaic inverter with multipath direct current input |
| CN204539043U (en) * | 2015-02-12 | 2015-08-05 | 中国电子工程设计院 | Distributed photovoltaic power generation system |
| CN204697003U (en) * | 2015-02-15 | 2015-10-07 | 无锡上能新能源有限公司 | A kind of device detecting photovoltaic cell component characterisitic parameter |
-
2016
- 2016-07-21 CN CN201610578513.XA patent/CN106230285A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203368361U (en) * | 2013-08-03 | 2013-12-25 | 阳光电源股份有限公司 | Photovoltaic inverter with multipath direct current input |
| CN204539043U (en) * | 2015-02-12 | 2015-08-05 | 中国电子工程设计院 | Distributed photovoltaic power generation system |
| CN204697003U (en) * | 2015-02-15 | 2015-10-07 | 无锡上能新能源有限公司 | A kind of device detecting photovoltaic cell component characterisitic parameter |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106788216A (en) * | 2017-02-10 | 2017-05-31 | 阳光电源股份有限公司 | A kind of photovoltaic inverting system and photovoltaic inversion method |
| CN106788216B (en) * | 2017-02-10 | 2020-01-24 | 阳光电源股份有限公司 | Photovoltaic inversion system and photovoltaic inversion method |
| CN108539782A (en) * | 2018-04-03 | 2018-09-14 | 阳光电源股份有限公司 | A kind of photovoltaic generating system |
| CN112305308A (en) * | 2020-10-21 | 2021-02-02 | 阳光电源股份有限公司 | Direct-current arc detection method and device and string inverter |
| CN112305308B (en) * | 2020-10-21 | 2023-08-11 | 阳光电源股份有限公司 | DC arc detection method, device and string inverter |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Li et al. | Topology review and derivation methodology of single-phase transformerless photovoltaic inverters for leakage current suppression | |
| CN204578458U (en) | A kind of header box circuit structure and photovoltaic generating system | |
| US9520721B2 (en) | Solar photovoltaic three-phase micro-inverter and solar photovoltaic power generation system | |
| CN204103504U (en) | A kind of grid-connected photovoltaic system based on the access of mesohigh direct current | |
| CN103904926A (en) | Improved modular multilevel transverter submodule topology | |
| EP2403121A2 (en) | Solar power generation system and method | |
| Wang et al. | From H4, H5 to H6—Standardization of full-bridge single phase photovoltaic inverter topologies without ground leakage current issue | |
| WO2017185223A1 (en) | Multiplexed cascade-type photovoltaic power generation system and photovoltaic power generation apparatus | |
| CN106230285A (en) | A kind of group string data photovoltaic DC-to-AC converter topological structure | |
| CN102629836A (en) | Novel two-stage alternating-current photovoltaic module | |
| CN110858754A (en) | Two-stage control method and system of MMC type energy router | |
| CN203707804U (en) | Three-phase cascade multi-level photovoltaic inverter and control system thereof | |
| CN103036464B (en) | Photovoltaic array topological structure, grid-connected system based on photovoltaic array topological structure and photovoltaic array control method | |
| CN205304269U (en) | Direct current pressure increasing system of grid -connected PV electricity generation | |
| CN106330088A (en) | Three-body photovoltaic power generation direct-current optimizer with direct-through devices | |
| CN106208131A (en) | Access for new forms of energy and the Multilevel Inverters topological structure of active distribution network | |
| CN102118116B (en) | Solar photovoltaic synchronization group micro-inverter and direct current and alternating current inverting methods | |
| CN201869115U (en) | Solar photovoltaic synchronization group micro inverter | |
| Razi et al. | Microinverter topology based single-stage grid-connected photovoltaic system: A review | |
| Faruqui et al. | A review analysis of inverter topologies for solar PV applications focused on power quality | |
| CN204316098U (en) | Multichannel MPPT photovoltaic inverting system | |
| CN203537259U (en) | Five-level single-phase photovoltaic grid-connected inverter | |
| CN204334372U (en) | MW class group string data inversion boosting device | |
| Orfanoudakis et al. | Single-phase transformerless PV inverter topology with AC bypass and mid-DC-link voltage clamping | |
| Anand et al. | Multilevel open-ended transformer based grid feeding inverter for solar photovoltaic application |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20161214 |
|
| WD01 | Invention patent application deemed withdrawn after publication |