CN113572195A - Photovoltaic module charging system and photovoltaic system - Google Patents
Photovoltaic module charging system and photovoltaic system Download PDFInfo
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- 238000006243 chemical reaction Methods 0.000 description 3
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- 230000002457 bidirectional effect Effects 0.000 description 1
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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
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
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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
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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
- H02M7/66—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal
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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
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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
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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
-
- 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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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The photovoltaic module charging system comprises a current limiting circuit and a DC/AC converter, wherein the current limiting circuit is connected between the photovoltaic module and the DC side of the DC/AC converter, the AC side of the DC/AC converter is connected with an AC power grid, and the current limiting circuit limits the charging current of the photovoltaic module within a preset current range under the condition of charging the photovoltaic module. Compared with the prior art, the charging system provided by the invention has the advantages that the current limiting circuit is arranged between the photovoltaic module and the DC/AC converter, the charging current of the photovoltaic module is limited within the preset current range through the current limiting circuit, and the control is not dependent on the DC/AC converter any more, so that the control precision of the charging current is effectively improved, and the actual application requirements are met.
Description
Technical Field
The invention relates to the technical field of photovoltaic power generation, in particular to a photovoltaic module charging system and a photovoltaic system.
Background
As shown in fig. 1, in a photovoltaic system in the prior art, an output end of a photovoltaic module is connected to a DC side of a DC/AC converter, an AC side of the DC/AC converter is connected to an AC power grid through a corresponding control switch, and DC electric energy output by the photovoltaic module is converted into AC electric energy by the DC/AC converter and then is merged into the AC power grid.
In practical application, in order to improve the power generation efficiency of the photovoltaic module during working in the daytime, the photovoltaic module is charged through the DC/AC converter after the photovoltaic module stops generating power at night. Research shows that when the charging current of the photovoltaic module is maintained in the range of 0.5% -1% of the rated current of the DC/AC converter, the charging current is most beneficial to improving the generating efficiency of the photovoltaic module.
However, since the control precision of the output current of the DC/AC converter in the prior art is not high, it is difficult to accurately limit the charging current within the above ideal range, and it is difficult to meet the requirements of practical applications.
Disclosure of Invention
The invention provides a photovoltaic module charging system and a photovoltaic system.A current limiting circuit is arranged between a photovoltaic module and a DC/AC converter, the charging current of the photovoltaic module is limited within a preset current range by the current limiting circuit and is not dependent on the DC/AC converter for control, the control precision of the charging current is effectively improved, and the actual application requirements are met.
In order to achieve the purpose, the technical scheme provided by the invention is as follows:
in a first aspect, the present invention provides a photovoltaic module charging system, comprising: a current limiting circuit and a DC/AC converter, wherein,
the current limiting circuit is connected between the photovoltaic module and the direct current side of the DC/AC converter;
the alternating current side of the DC/AC converter is connected with an alternating current power grid;
under the condition of charging the photovoltaic module, the current limiting circuit limits the charging current of the photovoltaic module within a preset current range.
Optionally, under the condition that the photovoltaic module outputs electric energy, the current limiting circuit is in a conducting state.
Optionally, the current limiting circuit comprises a first controllable switch and a dc power converter, wherein,
the first controllable switch and the dc power converter are connected in parallel.
Optionally, when the photovoltaic module is charged, the first controllable switch is in an off state, and the dc power converter limits the charging current of the photovoltaic module within a preset current range.
Optionally, when the photovoltaic module outputs electric energy, the first controllable switch is in a closed state, and the dc power converter is in a shutdown state.
Optionally, the current limiting circuit further includes: a second controllable switch, wherein,
the second controllable switch is connected with the direct current power converter in series to form a series branch;
the series branch is connected in parallel with the first controllable switch.
Optionally, the second controllable switch is in a closed state when the photovoltaic module is charged.
Optionally, under the condition that the photovoltaic module outputs electric energy, the first controllable switch is in a closed state;
the dc power converter is in a shutdown state or the second controllable switch is in an open state.
Optionally, the first controllable switch includes one of a relay and a contactor;
the direct current power converter includes a DC/DC converter.
Optionally, the second controllable switch includes one of a relay and a contactor.
Optionally, the rated power of the current limiting circuit is smaller than the rated power of the DC/AC converter.
Optionally, the photovoltaic module charging system provided by the first aspect of the present invention further includes: a controller, wherein the controller is configured to, among other things,
the controller is respectively connected with the control end of the current limiting circuit and the control end of the DC/AC converter;
the controller controls the current limiting circuit and the working state of the DC/AC converter.
Optionally, the photovoltaic module charging system provided by the first aspect of the present invention further includes: a third controllable switch, wherein,
the alternating current side of the DC/AC converter is connected with an alternating current power grid through the third controllable switch.
In a second aspect, the present invention provides a photovoltaic system comprising: at least one photovoltaic module and the photovoltaic module charging system according to any one of the first aspect of the present invention, wherein,
and each photovoltaic module is respectively connected with a current limiting circuit in the photovoltaic module charging system.
The invention provides a photovoltaic module charging system which comprises a current limiting circuit and a DC/AC converter, wherein the current limiting circuit is connected between a photovoltaic module and the DC side of the DC/AC converter, the AC side of the DC/AC converter is connected with an AC power grid, and the current limiting circuit limits the charging current of the photovoltaic module within a preset current range under the condition of charging the photovoltaic module. Compared with the prior art, the charging system provided by the invention has the advantages that the current limiting circuit is arranged between the photovoltaic module and the DC/AC converter, the charging current of the photovoltaic module is limited within the preset current range through the current limiting circuit, and the control is not dependent on the DC/AC converter any more, so that the control precision of the charging current is effectively improved, and the actual application requirements are met.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of a photovoltaic system of the prior art;
fig. 2 is a block diagram of a photovoltaic module charging system according to an embodiment of the present invention;
fig. 3 is a block diagram of another photovoltaic module charging system according to an embodiment of the present invention;
fig. 4 is a block diagram of a photovoltaic module charging system according to another embodiment of the present invention;
fig. 5 is a block diagram of a photovoltaic module charging system according to another embodiment of the present invention;
fig. 6 is a block diagram of another photovoltaic module charging system according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, 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 application.
The term "include" and variations thereof as used herein are open-ended, i.e., "including but not limited to". The term "based on" is "based, at least in part, on". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments". Relevant definitions for other terms will be given in the following description.
It should be noted that the terms "first", "second", and the like in the present disclosure are only used for distinguishing different devices, modules or units, and are not used for limiting the order or interdependence relationship of the functions performed by the devices, modules or units.
It is noted that references to "a", "an", and "the" modifications in this disclosure are intended to be illustrative rather than limiting, and that those skilled in the art will recognize that "one or more" may be used unless the context clearly dictates otherwise.
As mentioned above, in the prior art, the process of charging the photovoltaic module at night is completed by the DC/AC converter, the DC/AC converter is provided with the current sensor, and the magnitude of the charging current of the photovoltaic module is determined by the current sensor, so as to control the charging process of the photovoltaic module. However, because the sampling accuracy of the current sensor is not sufficient, it is difficult to control the charging current in an ideal range in practical application in the prior art, and it is conceivable that if the charging current is too small, it is difficult to achieve the purpose of improving the power generation efficiency of the photovoltaic module, and conversely, if the charging current is too large, a large amount of waste of electric energy is caused, and the effect of improving the power generation efficiency of the photovoltaic module is not optimal. Therefore, how to control the magnitude of the charging current becomes a key for improving the power generation efficiency of the photovoltaic module.
Based on the above, an embodiment of the present invention provides a photovoltaic module charging system, referring to fig. 2, where fig. 2 is a block diagram of a structure of the photovoltaic module charging system provided in the embodiment of the present invention, and the photovoltaic module charging system provided in the embodiment includes: a current limiting circuit and a DC/AC converter, wherein,
one side of the current limiting circuit is connected with the output end of the photovoltaic module, the other side of the current limiting circuit is connected with the direct current side of the DC/AC, namely the current limiting circuit is connected between the photovoltaic module and the direct current side of the DC/AC converter, and further the alternating current side of the DC/AC converter is connected with an alternating current power grid.
It is conceivable that, in practical applications, there may be one or more photovoltaic modules connected to the current limiting circuit, and the specific connection number of the photovoltaic modules may be determined according to a specific application scenario, which is not limited in the present invention.
At night, under the condition of charging the photovoltaic module, alternating current of an alternating current power grid is firstly converted into direct current through a DC/AC converter, the obtained direct current is charging current of the photovoltaic module, and the charging current is input into the photovoltaic module through a current limiting circuit to realize charging of the photovoltaic module. Most importantly, the current limiting circuit has current limiting and regulating functions, can limit the charging current of the photovoltaic module within a preset current range, does not depend on a DC/AC converter for controlling the charging current, and the DC/AC converter is only used for realizing the conversion of alternating current into direct current.
Certainly, in order not to affect the normal operation of the photovoltaic system, the current limiting circuit is in a conducting state under the conditions that the photovoltaic module normally operates and outputs electric energy in the daytime, and the function of the photovoltaic module to the alternating current power grid is not affected.
Based on the above, it is conceivable that the DC/AC converter described in this embodiment should be a bidirectional DC/AC converter, which can convert DC to AC and also convert AC to DC, so as to convert AC power provided by the AC power grid into DC power when charging the photovoltaic module.
In summary, compared with the prior art, the charging system provided by the invention has the advantages that the current limiting circuit is arranged between the photovoltaic module and the DC/AC converter, the charging current of the photovoltaic module is limited within the preset current range through the current limiting circuit, and the control is not dependent on the DC/AC converter, so that the control precision of the charging current is effectively improved, and the actual application requirements are met.
Optionally, on the basis of the embodiment shown in fig. 2, a more specific implementation manner of the current limiting circuit is further provided in the present invention, referring to fig. 3, fig. 3 is a block diagram of a structure of another photovoltaic module charging system provided in the embodiment of the present invention, in the photovoltaic module charging system provided in this embodiment, the current limiting circuit includes a first controllable switch K1 and a dc power converter, wherein,
the first controllable switch K1 is connected in parallel with the dc power converter forming a parallel branch. One end of the obtained parallel branch is used as one end of the current limiting circuit and is connected with the output end of the photovoltaic module, and the other end of the parallel branch is used as the other end of the current limiting circuit and is connected with the direct current side of the DC/AC converter.
When charging the photovoltaic module at night, the first controllable switch K1 in the charging system provided by the embodiment is in an off state, the charging current is input to the photovoltaic module through the direct current power converter, the photovoltaic module is charged, and the charging current of the photovoltaic module is limited within a preset current range by the direct current power converter.
Correspondingly, under the condition that the photovoltaic module normally works and outputs electric energy in the daytime, the first controllable switch K1 in the current limiting circuit is in a closed state, the direct-current power converter is in a shutdown state, the current output by the photovoltaic module is input into the DC/AC converter through the first controllable switch K1, and is input into the alternating-current power grid after being converted into alternating current by the DC/AC converter.
Optionally, in practical applications, the DC power converters described in this embodiment and the following embodiments may be implemented based on DC/DC converters. Further, considering that the DC power converter is only in an operating state when charging the photovoltaic module, and the smaller the rated power of the DC power converter is, the higher the current control accuracy is, therefore, the rated power of the DC power conversion circuit should be much smaller than the rated power of the DC/AC converter.
As for the first controllable switch K1, in practical applications, one of a relay, a contactor and other controllable devices that can realize the above functions can be selected, and the first controllable switch K1 also belongs to the protection scope of the present invention without departing from the scope of the core idea of the present invention.
In summary, in the photovoltaic module charging system provided in the embodiments of the present invention, the current limiting circuit includes the first controllable switch and the dc power converter, when the photovoltaic module outputs the electric energy, the first controllable switch is in the closed state, and the dc power converter is in the shutdown state, so that the normal operation of the photovoltaic module in the daytime is not affected, and at night, the first controllable switch is in the open state, the charging current passes through the dc power converter to perform the photovoltaic module, and the magnitude of the charging current is limited by the dc power converter, so as to solve the problems in the prior art.
Optionally, referring to fig. 4, fig. 4 is a block diagram of a structure of another photovoltaic module charging system according to an embodiment of the present invention, and on the basis of the embodiment shown in fig. 3, the current limiting circuit in the photovoltaic module charging system according to the embodiment further includes a second controllable switch K2.
As shown in fig. 4, the second controllable switch K2 is connected in series with the dc power converter forming a series branch, the resulting series branch being further connected in parallel with the first controllable switch K1. One end of the parallel branch circuit obtained by parallel connection is used as one end of the current limiting circuit and is connected with the output end of the photovoltaic module, and the other end of the parallel branch circuit is used as the other end of the current limiting circuit and is connected with the direct current side of the DC/AC converter.
Based on the composition and connection relation of the current limiting circuit, when the photovoltaic module is charged at night, the second controllable switch K2 is in a closed state, the first controllable switch K1 is in an open state, and charging current enters the photovoltaic module through the direct current power converter and the second controllable switch K2 to charge the photovoltaic module; under the condition that the photovoltaic module normally works and outputs direct current electric energy in daytime, the first controllable switch K1 is in a closed state, the direct current power converter in the series branch is in a stop state, or the second controllable switch K2 in the series branch is in an open state, so that the electric energy output by the photovoltaic module enters the DC/AC converter through the first controllable switch K1, is converted into alternating current electric energy through the DC/AC converter, and is merged into an alternating current power grid.
Optionally, similar to the type selection of the first controllable switch K1, the second controllable switch K2 described in this embodiment may also be implemented by using any one of a relay and a contactor, and of course, may also be implemented by using other control switches having the same function, without departing from the scope of the core idea of the present invention, and the scope of protection of the present invention also falls within the scope of protection of the present invention.
In summary, in the photovoltaic module charging system provided in the embodiment of the present invention, on the basis of the embodiment shown in fig. 3, the second controllable switch is additionally provided, and the second controllable switch can ensure reliable disconnection of the branch where the dc power converter is located, so as to further ensure reliable operation of the photovoltaic system.
Optionally, referring to fig. 5, fig. 5 is a block diagram of a structure of another photovoltaic module charging system according to an embodiment of the present invention, and based on any of the above embodiments (taking the embodiment shown in fig. 4 as an example), the charging system further includes a controller, wherein,
the controller is respectively connected with the control end of the current limiting circuit and the control end of the DC/AC converter. Specifically, as shown in fig. 5, the control terminal of the current limiting circuit mainly includes a control terminal of the first controllable switch K1, a control terminal of the second controllable switch K2, and a control terminal of the dc power converter.
It is conceivable that the controller is primarily intended to control the current limiting circuit and the operating state of the DC/AC converter. Specifically, it is mainly required to control the conducting states of the first controllable switch K1 and the second controllable switch K2 in the current limiting circuit and the operation process of the dc power converter, and it can be specifically referred to the implementation of the operation states of the first controllable switch K1, the second controllable switch K2 and the dc power converter at different times as described in the foregoing, and the description is not repeated here; for the DC/AC converter, the controller mainly needs to control the current conversion direction of the DC/AC converter, so as to implement the process of converting AC into DC or converting DC into AC.
Further, in order to ensure that the connection between the photovoltaic power generation system and the AC power grid is controllable, a third controllable switch K3 is further disposed between the DC/AC converter and the AC power grid, and specifically, referring to fig. 6, on the basis of the embodiment shown in fig. 5 (which may be the other embodiments described above), one side of the third controllable switch K3 is connected to the AC side of the DC/AC converter, and the other side of the third controllable switch K3 is connected to the AC power grid. It is conceivable that the third controllable switch K3 may be controlled to be closed when the photovoltaic power generation system needs to be incorporated into the ac power grid, and the third controllable switch K3 may be directly controlled to be opened when the photovoltaic power generation system needs to be disconnected from the ac power grid.
Optionally, as shown in fig. 6, the controller may be further connected to a control terminal of the third controllable switch K3 to control the on state of the third controllable switch K3.
Optionally, the present invention further provides a photovoltaic system, including: at least one photovoltaic module and any of the embodiments above provide a photovoltaic module charging system, wherein,
and each photovoltaic module is respectively connected with a current limiting circuit in the photovoltaic module charging system.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
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.
The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module may reside in Random Access Memory (RAM), memory, Read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present 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 (14)
1. A photovoltaic module charging system, comprising: a current limiting circuit and a DC/AC converter, wherein,
the current limiting circuit is connected between the photovoltaic module and the direct current side of the DC/AC converter;
the alternating current side of the DC/AC converter is connected with an alternating current power grid;
under the condition of charging the photovoltaic module, the current limiting circuit limits the charging current of the photovoltaic module within a preset current range.
2. The pv module charging system of claim 1, wherein the current limiting circuit is in a conducting state when the pv module is outputting power.
3. The photovoltaic module charging system of claim 2, wherein the current limiting circuit comprises a first controllable switch and a DC power converter, wherein,
the first controllable switch and the dc power converter are connected in parallel.
4. The photovoltaic module charging system according to claim 3, wherein the first controllable switch is in an off state when the photovoltaic module is charged, and the DC power converter limits the charging current of the photovoltaic module within a preset current range.
5. The pv module charging system of claim 3, wherein the first controllable switch is in a closed state and the dc power converter is in a shutdown state when the pv module is outputting power.
6. The photovoltaic module charging system of claim 3, wherein the current limiting circuit further comprises: a second controllable switch, wherein,
the second controllable switch is connected with the direct current power converter in series to form a series branch;
the series branch is connected in parallel with the first controllable switch.
7. The photovoltaic module charging system according to claim 6, wherein the second controllable switch is in a closed state while the photovoltaic module is being charged.
8. The photovoltaic module charging system according to claim 6, wherein the first controllable switch is in a closed state when the photovoltaic module outputs electrical energy;
the dc power converter is in a shutdown state or the second controllable switch is in an open state.
9. The photovoltaic module charging system of claim 3, wherein the first controllable switch comprises one of a relay, a contactor;
the direct current power converter includes a DC/DC converter.
10. The photovoltaic module charging system of claim 6, wherein the second controllable switch comprises one of a relay and a contactor.
11. The photovoltaic module charging system of claim 1, wherein the current limiting circuit has a power rating less than a power rating of the DC/AC converter.
12. The photovoltaic module charging system according to any one of claims 1 to 11, further comprising: a controller, wherein the controller is configured to, among other things,
the controller is respectively connected with the control end of the current limiting circuit and the control end of the DC/AC converter;
the controller controls the current limiting circuit and the working state of the DC/AC converter.
13. The photovoltaic module charging system according to any one of claims 1 to 11, further comprising: a third controllable switch, wherein,
the alternating current side of the DC/AC converter is connected with an alternating current power grid through the third controllable switch.
14. A photovoltaic system, comprising: at least one photovoltaic module and the photovoltaic module charging system of any of claims 1-13,
and each photovoltaic module is respectively connected with a current limiting circuit in the photovoltaic module charging system.
Priority Applications (1)
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| CN206673905U (en) * | 2017-04-26 | 2017-11-24 | 衢州学院 | A kind of anti-PID effects DC-to-AC converter of intelligence |
| CN109334488A (en) * | 2018-10-15 | 2019-02-15 | 东营市富海桑林太阳能发电有限公司 | Energy source station with oiling, aerating and photovoltaic generating system, energy-storage system and charging pile |
| WO2021057268A1 (en) * | 2019-09-29 | 2021-04-01 | 华为技术有限公司 | Inverter, combiner box and photovoltaic system |
| CN113067365A (en) * | 2020-01-02 | 2021-07-02 | 合肥阳光新能源科技有限公司 | Direct-current coupling wind-solar complementary system and photovoltaic PID repair control method thereof |
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| CN206673905U (en) * | 2017-04-26 | 2017-11-24 | 衢州学院 | A kind of anti-PID effects DC-to-AC converter of intelligence |
| CN109334488A (en) * | 2018-10-15 | 2019-02-15 | 东营市富海桑林太阳能发电有限公司 | Energy source station with oiling, aerating and photovoltaic generating system, energy-storage system and charging pile |
| WO2021057268A1 (en) * | 2019-09-29 | 2021-04-01 | 华为技术有限公司 | Inverter, combiner box and photovoltaic system |
| CN113067365A (en) * | 2020-01-02 | 2021-07-02 | 合肥阳光新能源科技有限公司 | Direct-current coupling wind-solar complementary system and photovoltaic PID repair control method thereof |
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