CN114172373A - Photovoltaic conversion system - Google Patents
Photovoltaic conversion system Download PDFInfo
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- CN114172373A CN114172373A CN202111508851.3A CN202111508851A CN114172373A CN 114172373 A CN114172373 A CN 114172373A CN 202111508851 A CN202111508851 A CN 202111508851A CN 114172373 A CN114172373 A CN 114172373A
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- converter
- photovoltaic
- conversion system
- photovoltaic conversion
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- 238000006243 chemical reaction Methods 0.000 title claims abstract description 40
- 239000003990 capacitor Substances 0.000 claims description 6
- 238000000034 method Methods 0.000 description 8
- 230000008901 benefit Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
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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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac 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
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac 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
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac 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 with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac 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 with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
- H02M3/1584—Conversion of dc power input into dc power output without intermediate conversion into ac 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 with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load with a plurality of power processing stages connected in parallel
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/22—The renewable source being solar energy
- H02J2300/24—The renewable source being solar energy of photovoltaic origin
- H02J2300/26—The renewable source being solar energy of photovoltaic origin involving maximum power point tracking control for photovoltaic sources
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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)
- Dc-Dc Converters (AREA)
Abstract
The invention provides a photovoltaic conversion system, wherein a positive bus of a DC/AC converter is connected with a corresponding photovoltaic string through at least one first DC/DC converter, and a negative bus of the DC/AC converter is connected with the corresponding photovoltaic string through at least one second DC/DC converter; and the second DC/DC converter is a converter with reversed input and output polarities, and the negative bus of the DC/AC converter can be obtained only through the first-stage conversion of the second DC/DC converter.
Description
Technical Field
The invention relates to the technical field of photovoltaic conversion, in particular to a photovoltaic conversion system.
Background
In a new energy system, efficiency improvement is generally achieved by increasing voltage. Current photovoltaic conversion systems, generally as shown in fig. 1, have a DC/DC converter for providing a positive bus of a DC/AC converter; moreover, the output voltage of the DC/DC converter is converted by adding a polarity reversal converter, and then a negative bus of the DC/AC converter is provided; and then the DC/AC converter inverts the voltage received by the positive bus and the negative bus to realize alternating current grid connection.
Although the scheme shown in fig. 1 can improve the efficiency by improving the bus voltage on the direct current side of the DC/AC converter, the overall efficiency is low due to the fact that the negative bus needs to undergo two-stage conversion, which is not beneficial to improving the efficiency of the photovoltaic new energy.
Disclosure of Invention
In view of the above, the present invention provides a photovoltaic conversion system to improve system efficiency.
In order to achieve the above purpose, the embodiments of the present invention provide the following technical solutions:
a first aspect of the invention provides a photovoltaic conversion system comprising: at least one DC/AC converter, at least one first DC/DC converter, and at least one second DC/DC converter; wherein:
the positive bus of the DC/AC converter is connected with the corresponding photovoltaic string through at least one first DC/DC converter;
the negative bus of the DC/AC converter is connected with the corresponding photovoltaic string through at least one second DC/DC converter;
the second DC/DC converter is a converter with reversed input and output polarities.
Optionally, the second DC/DC converter is a converter with continuous input current, and is configured to implement maximum power point tracking MPPT for a photovoltaic string connected to the second DC/DC converter.
Optionally, the first DC/DC converter is a converter with continuous input current, and is configured to implement MPPT for a photovoltaic string connected to the first DC/DC converter.
Optionally, the main circuit in the first DC/DC converter is a Boost circuit.
Optionally, the main circuit in the first DC/DC converter is a flying capacitor type Boost circuit.
Optionally, the main circuit in the second DC/DC converter is a Cuk circuit.
Optionally, the main circuit in the second DC/DC converter is a flying capacitor type Cuk circuit.
Optionally, main circuits in the first DC/DC converter and the second DC/DC converter are both three-level circuits.
Optionally, the number of the first DC/DC converter and the second DC/DC converter connected to the DC/AC converter is the same, and the number of the photovoltaic strings connected to the first DC/DC converter and the second DC/DC converter is the same.
Optionally, when the number of the DC/AC converters is greater than 1, the AC sides of the DC/AC converters are connected in parallel.
The invention provides a photovoltaic conversion system, wherein a positive bus of a DC/AC converter is connected with a corresponding photovoltaic string through at least one first DC/DC converter, and a negative bus of the DC/AC converter is connected with the corresponding photovoltaic string through at least one second DC/DC converter; and the second DC/DC converter is a converter with reversed input and output polarities, and the negative bus of the DC/AC converter can be obtained only through the first-stage conversion of the second DC/DC converter.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings to be used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a photovoltaic conversion system provided in the prior art;
fig. 2 is a schematic structural diagram of a photovoltaic conversion system according to an embodiment of the present invention;
fig. 3 is a circuit diagram of two DC/DC converters in a photovoltaic conversion system according to an embodiment of the present invention;
fig. 4 is another circuit diagram of two DC/DC converters in a photovoltaic conversion system according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In this application, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
In the power transmission process of the power electronic circuit, if only single-stage conversion is carried out, the efficiency of the power electronic circuit is about 99% of the input power; if the two-stage transformation is performed, the efficiency of the transformation is changed to 0.99 × 0.99 ≈ 98%. Therefore, the prior art solution shown in fig. 1 inevitably causes a problem of low system efficiency in the case that the negative bus of the DC/AC converter needs to undergo two-stage conversion, i.e., a DC/DC converter and a polarity-reversal converter.
Therefore, the invention provides a photovoltaic conversion system to improve the system efficiency.
As shown in fig. 2, the photovoltaic conversion system includes: at least one DC/AC converter 101, at least one first DC/DC converter 201, and at least one second DC/DC converter 202; wherein the positive buses (+ and 0 as shown in fig. 2) of the DC/AC converter 101 are connected to the respective photovoltaic string PV via at least one first DC/DC converter 201; the negative buses (0 and-) of the DC/AC converter 101 as shown in fig. 2 are connected to the respective photovoltaic string PV via at least one second DC/DC converter 202.
In practical application, the number of the first DC/DC converters 201 connected to the positive bus may be any, and when the number is greater than 1, the output end of each first DC/DC converter 201 is connected to the positive bus in parallel; similarly, the number of the second DC/DC converters 202 connected to the negative bus may be any, and when the number is greater than 1, the output terminals of the respective second DC/DC converters 202 are connected in parallel to the negative bus. In addition, the number of the photovoltaic strings PV connected to the input terminal of the first DC/DC converter 201 or the second DC/DC converter 202 may be determined according to actual situations, and is not limited herein. A specific example is that, for one DC/AC converter 101, the number of first DC/DC converters 201 connected to the positive bus thereof and the number of second DC/DC converters 202 connected to the negative bus thereof are the same, and the number of photovoltaic string PV connected to each first DC/DC converter 201 and each second DC/DC converter 202 is also the same, which is favorable for modular management.
In addition, in the photovoltaic conversion system, the number of the DC/AC converters 101 may be 1 or more than 1; when it is greater than 1, the AC sides of the respective DC/AC converters 101 are connected in parallel to achieve the corresponding grid-connected power level.
On the power transmission branch between each photovoltaic group string PV and the electric wire netting, can also be provided with other equipment, such as relay and wave filter etc. see prior art, all be in the scope of protection of this application.
Each photovoltaic group string PV is converted through a corresponding DC/DC converter, and then corresponding bus voltage can be obtained; the first DC/DC converter 201 needs to output a positive bus voltage, so that the input and output polarities of the first DC/DC converter are the same, for example, in a common-negative topology, a positive potential of the input of the first DC/DC converter is a positive potential of the output after passing through some devices; however, the second DC/DC converter 202 needs to output the negative bus voltage, and if the input and output polarities of the second DC/DC converter 202 are also the same, the voltage of the photovoltaic string PV connected to the input terminal of the second DC/DC converter is reversed under the condition that the negative bus connected to the output terminal of the second DC/DC converter has the voltage, so that the PID effect of the battery panel is caused, the power generation efficiency is affected, and the lifetime of the photovoltaic string PV is also affected; therefore, the second DC/DC converter 202 needs to adopt a converter with reversed input and output polarities, for example, the negative potential of its input will become the positive potential of its output.
The photovoltaic conversion system provided by this embodiment can obtain the negative bus of the DC/AC converter 101 only through the first-stage conversion of the second DC/DC converter 202, which saves the first-stage power conversion and improves the system efficiency compared with the negative bus providing scheme in the prior art.
Moreover, this embodiment compares in prior art's scheme, also can obtain the reduction of certain degree from volume and cost aspect, does benefit to the popularization more.
On the basis of the above embodiment, it is preferable that in the photovoltaic conversion system, the second DC/DC converter 202 is a converter with continuous input current, and is configured to implement MPPT (maximum power Point Tracking) for the photovoltaic string PV connected thereto. That is, the second DC/DC converter 202 providing the negative bus for the DC/AC converter 101 can simultaneously implement the polarity reversal function and MPPT, and ensure that the corresponding PV string PV can output at its real-time maximum power.
The first DC/DC converter 201 is also a converter with continuous input current, and is configured to implement MPPT on the photovoltaic string PV connected thereto, and ensure that the corresponding photovoltaic string PV can output at its real-time maximum power.
Therefore, the photovoltaic conversion system provided by the embodiment not only needs one stage of conversion circuit for providing the negative bus, but also improves the system efficiency; and the maximization of photovoltaic output power is ensured, and the power generation capacity of the system is improved.
On the basis of the above embodiments, it is preferable that, as shown in fig. 3, in the photovoltaic conversion system, the main circuit in the first DC/DC converter 201 is a Boost circuit.
The Boost circuit is used as a conventional photovoltaic converter, has the advantage of continuous input current, is beneficial to realizing MPPT, and can form a positive bus.
In order to make the second DC/DC converter 202 also be a converter with continuous input current, its main circuit may adopt a Cuk circuit, which can reserve the advantage that the Boost circuit has continuous input current, and thus is also beneficial to implementing MPPT.
In practical applications, the main circuit of the second DC/DC converter 202 is not limited to be implemented by a Cuk circuit, which is only an example; any circuit capable of achieving MPPT and outputting reverse polarity is within the scope of the present application.
Fig. 4 shows an alternative example in which the main circuit in the first DC/DC converter 201 is a flying capacitor type three-level Boost circuit (FC-Boost), and the main circuit in the second DC/DC converter 202 is a flying capacitor type three-level Cuk circuit (FC-Cuk).
Of course, in practical applications, other topologies may be adopted, and the topology is not limited to three levels, and circuits capable of respectively implementing their corresponding functions are within the scope of the present application.
In this embodiment, the second DC/DC converter 202 with continuous input current and reverse output polarity is adopted to simultaneously realize MPPT and reverse output, and realize single-stage conversion of the negative bus, which has the advantage of high conversion efficiency; the MPPT circuit and a conventional MPPT circuit, such as the Boost circuit, form a high-voltage conversion system on a direct current side, and the overall efficiency of the system can be improved.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, the system or system embodiments are substantially similar to the method embodiments and therefore are described in a relatively simple manner, and reference may be made to some of the descriptions of the method embodiments for related points. The above-described system and system embodiments are only illustrative, wherein the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
In the above description of the disclosed embodiments, the features described in the embodiments in this specification may be replaced or combined with each other to enable those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A photovoltaic conversion system, comprising: at least one DC/AC converter, at least one first DC/DC converter, and at least one second DC/DC converter; wherein:
the positive bus of the DC/AC converter is connected with the corresponding photovoltaic string through at least one first DC/DC converter;
the negative bus of the DC/AC converter is connected with the corresponding photovoltaic string through at least one second DC/DC converter;
the second DC/DC converter is a converter with reversed input and output polarities.
2. The photovoltaic conversion system of claim 1, wherein the second DC/DC converter is an input current continuous converter for achieving maximum power point tracking, MPPT, for a photovoltaic string to which it is connected.
3. The photovoltaic conversion system of claim 1, wherein the first DC/DC converter is an input current continuous converter for achieving MPPT for a photovoltaic string connected thereto.
4. The photovoltaic conversion system of claim 1, wherein the main circuit in the first DC/DC converter is a Boost circuit.
5. The photovoltaic conversion system according to claim 4, wherein the main circuit in the first DC/DC converter is a Boost circuit of a flying capacitor type.
6. The photovoltaic conversion system according to claim 1, wherein the main circuit in the second DC/DC converter is a Cuk circuit.
7. The photovoltaic conversion system according to claim 6, wherein the main circuit in the second DC/DC converter is a flying capacitor type Cuk circuit.
8. The photovoltaic conversion system according to any one of claims 1 to 7, wherein each of the main circuits of the first DC/DC converter and the second DC/DC converter is a three-level circuit.
9. The system according to any one of claims 1 to 7, wherein the number of the first DC/DC converter and the second DC/DC converter to which the DC/AC converter is connected is the same, and the number of the photovoltaic strings to which the first DC/DC converter and the second DC/DC converter are connected is the same.
10. The photovoltaic conversion system according to any one of claims 1 to 7, wherein when the number of the DC/AC converters is greater than 1, the AC sides of the DC/AC converters are connected in parallel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111508851.3A CN114172373A (en) | 2021-12-10 | 2021-12-10 | Photovoltaic conversion system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111508851.3A CN114172373A (en) | 2021-12-10 | 2021-12-10 | Photovoltaic conversion system |
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| CN114172373A true CN114172373A (en) | 2022-03-11 |
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| CN202111508851.3A Pending CN114172373A (en) | 2021-12-10 | 2021-12-10 | Photovoltaic conversion system |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103607033A (en) * | 2013-06-27 | 2014-02-26 | 山亿新能源股份有限公司 | Novel photovoltaic control integrated system |
| CN104953945A (en) * | 2015-07-01 | 2015-09-30 | 中民新能投资有限公司 | High-efficiency photovoltaic power generation system and method |
| US20170279279A1 (en) * | 2016-03-25 | 2017-09-28 | Hitachi lnformation & Telecommunication Engineering, Ltd. | Power converter |
| CN107800316A (en) * | 2016-08-31 | 2018-03-13 | 西门子公司 | Inverter and photovoltaic apparatus |
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2021
- 2021-12-10 CN CN202111508851.3A patent/CN114172373A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103607033A (en) * | 2013-06-27 | 2014-02-26 | 山亿新能源股份有限公司 | Novel photovoltaic control integrated system |
| CN104953945A (en) * | 2015-07-01 | 2015-09-30 | 中民新能投资有限公司 | High-efficiency photovoltaic power generation system and method |
| US20170279279A1 (en) * | 2016-03-25 | 2017-09-28 | Hitachi lnformation & Telecommunication Engineering, Ltd. | Power converter |
| CN107800316A (en) * | 2016-08-31 | 2018-03-13 | 西门子公司 | Inverter and photovoltaic apparatus |
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