CN117613977A - Optical storage system - Google Patents

Optical storage system Download PDF

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Publication number
CN117613977A
CN117613977A CN202311597036.8A CN202311597036A CN117613977A CN 117613977 A CN117613977 A CN 117613977A CN 202311597036 A CN202311597036 A CN 202311597036A CN 117613977 A CN117613977 A CN 117613977A
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CN
China
Prior art keywords
switching element
converter
module
battery
photovoltaic
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
Application number
CN202311597036.8A
Other languages
Chinese (zh)
Inventor
罗剑威
林玉春
刘嘉明
杨帅
周锐
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Zhonghongke Innovation Energy Technology Zhejiang Co ltd
Original Assignee
Zhonghongke Innovation Energy Technology Zhejiang Co ltd
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Application filed by Zhonghongke Innovation Energy Technology Zhejiang Co ltd filed Critical Zhonghongke Innovation Energy Technology Zhejiang Co ltd
Priority to CN202311597036.8A priority Critical patent/CN117613977A/en
Publication of CN117613977A publication Critical patent/CN117613977A/en
Pending legal-status Critical Current

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Classifications

    • 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
    • H02J3/28—Arrangements for balancing of the load in a network by storage of energy
    • H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
    • 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
    • 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
    • H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
    • H02J3/466—Scheduling the operation of the generators, e.g. connecting or disconnecting generators to meet a given demand
    • 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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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The application provides a light stores up system, including photovoltaic module, battery module and control module, photovoltaic module includes photovoltaic module and first converter, and battery module includes battery module and second converter, and the first end of electric wire netting is connected to the first output of first converter, and the second output of first converter is connected to the first output of second converter, and the second end of electric wire netting is connected to the second output of second converter. The control module is connected with the first converter and the second converter, and the first converter and the second converter are controlled to enable the photovoltaic module and/or the battery module to discharge the power grid, or enable the power grid and the photovoltaic module to charge the battery module, or enable the power grid to charge the battery module, so that the power interaction requirement with the power grid is met through the converter of the battery module and the converter of the photovoltaic module, namely, the flexible adaptation operation with multiple degrees of freedom is met based on the alternating-current side coupling of the photovoltaic module and the battery module on the premise that no additional converter is added.

Description

Optical storage system
Technical Field
The application relates to the field of energy storage, in particular to an optical storage system.
Background
A photovoltaic storage system is a power generation system consisting of photovoltaic devices and energy storage devices, and generally includes a photovoltaic module, an energy storage battery, and an inverter/converter.
For a direct current coupled light storage system, low-voltage direct current generated by a photovoltaic module is coupled with an energy storage battery in a direct current converging cabinet after passing through a direct current-direct current converter, and then the low-voltage direct current is output through a unified direct current-alternating current converter and is connected into a low-voltage winding of a transformer.
For an alternating current coupling light storage system, a photovoltaic inverter and an energy storage inverter respectively invert low-voltage direct current output by a photovoltaic module and an energy storage battery, output the same-voltage alternating current, and then are converged into a transformer low-voltage winding after being coupled by an alternating current bus cabinet.
Therefore, the conventional optical storage system needs to be provided with an additional power converter when in coupling operation, and the system integration is complex.
Disclosure of Invention
The application provides an optical storage system for on the premise of not adding extra converter, satisfy multi freedom's flexible adaptation operation based on the alternating current side coupling of photovoltaic module and battery module.
In a first aspect, the present application provides an optical storage system comprising:
the photovoltaic module comprises a photovoltaic assembly and a first converter, and the battery module comprises a battery assembly and a second converter;
the first end of the photovoltaic module is connected with the first input end of the first converter, the second end of the photovoltaic module is connected with the second input end of the first converter, and the first output end of the first converter is connected with the first end of the power grid;
The first end of the battery assembly is connected with the first input end of the second current transformer, the second end of the battery assembly is connected with the second input end of the second current transformer, the first output end of the second current transformer is connected with the second output end of the first current transformer, and the second output end of the second current transformer is connected with the second end of the power grid;
the control module is connected with the first converter and the second converter and is used for enabling the photovoltaic assembly and/or the battery assembly to discharge the power grid, enabling the power grid and the photovoltaic assembly to charge the battery assembly or enabling the power grid to charge the battery assembly through controlling the first converter and the second converter.
Optionally, the number of the photovoltaic modules is multiple, and each photovoltaic module comprises a photovoltaic assembly and a first converter;
the first output end of the first converter of the first photovoltaic module is connected with the first end of the power grid;
the second output end of the first converter of the last photovoltaic module is connected with the first output end of the first converter of the next photovoltaic module;
the second output end of the first converter of the last photovoltaic module is connected with the first output end of the second converter of the battery module;
The control module is connected with each first converter, and the control module is used for enabling the photovoltaic assembly corresponding to each first converter to discharge the power grid or charge the battery assembly by controlling each first converter.
Optionally, the number of the battery modules is a plurality, and each battery module comprises a battery assembly and a second converter;
the first output end of the second current transformer of the first battery module is connected with the second output end of the first current transformer of the photovoltaic module;
the second output end of the second current transformer of the previous battery module is connected with the first output end of the second current transformer of the next battery module;
the second output end of the second converter of the last battery module is connected with the second end of the power grid;
the control module is connected with each second converter and is used for enabling the battery assembly corresponding to each second converter to discharge the power grid or enabling the battery assembly corresponding to each second converter to be charged by controlling each second converter.
Optionally, the first converter includes a first upper bridge arm and a first lower bridge arm, the first upper bridge arm includes a first switching element and a third switching element, and the first lower bridge arm includes a second switching element and a fourth switching element;
The first end of the first switching element is connected with the first end of the third switching element and is used as a first input end of the first converter;
the second end of the first switching element is connected with the first end of the second switching element and is used as a first output end of the first converter;
the second end of the second switching element is connected with the second end of the fourth switching element and is used as a second input end of the first converter;
the second end of the third switching element is connected with the first end of the fourth switching element and is used as a second output end of the first converter;
the control module is connected with the control end of the first switching element, the control end of the second switching element, the control end of the third switching element and the control end of the fourth switching element.
Optionally, the control module controls the second switching element and the fourth switching element to be closed, or controls the first switching element and the third switching element to be closed, so that the photovoltaic module stops running;
or controlling the first switching element to be closed or opened, the second switching element to be closed or opened, the third switching element to be opened or closed, and/or the fourth switching element to be opened or closed so that the photovoltaic assembly discharges the power grid or charges the battery assembly.
Optionally, the second converter includes a second upper bridge arm and a second lower bridge arm, the second upper bridge arm includes a fifth switching element and a seventh switching element, and the second lower bridge arm includes a sixth switching element and an eighth switching element;
the first end of the fifth switching element is connected with the first end of the seventh switching element and is used as the first input end of the second converter;
the second end of the fifth switching element is connected with the first end of the sixth switching element and is used as a first output end of the second converter;
a second end of the sixth switching element is connected with a second end of the eighth switching element and is used as a second input end of the second converter;
the second end of the seventh switching element is connected with the first end of the eighth switching element and is used as a second output end of the second converter;
the control module is connected with the control end of the fifth switching element, the control end of the sixth switching element, the control end of the seventh switching element and the control end of the eighth switching element.
Optionally, the control module controls the fifth switching element and the seventh switching element to be closed, or the sixth switching element and the eighth switching element to be closed, so that the battery assembly stops running;
Or controlling the fifth switching element to be closed or opened, the sixth switching element to be closed or opened, the seventh switching element to be closed or opened, and/or the eighth switching element to be closed or opened to discharge the battery assembly to the power grid or to charge the battery assembly.
Optionally, the control module is specifically configured to control the time when the first switching element is opened or closed, the time when the second switching element is opened or closed, the time when the third switching element is opened or closed, and/or the time when the fourth switching element is opened or closed, so as to control the discharging electric quantity of the photovoltaic module to the power grid or the charging electric quantity of the photovoltaic module to the battery module.
Optionally, the control module is specifically configured to control a time when the fifth switching element is opened or closed, a time when the sixth switching element is opened or closed, a time when the seventh switching element is opened or closed, and/or a time when the eighth switching element is opened or closed, so as to control a discharging capacity of the battery assembly on the power grid, or control a charged capacity of the battery assembly.
Optionally, the first switching element, the second switching element, the third switching element, the fourth switching element, the fifth switching element, the sixth switching element, the seventh switching element and the eighth switching element are MOS transistors.
The application provides a light stores up system, including photovoltaic module, battery module and control module, photovoltaic module includes photovoltaic module and first converter, and battery module includes battery module and second converter. The first end of the photovoltaic module is connected with the first input end of the first converter, the second end of the photovoltaic module is connected with the second input end of the first converter, and the first output end of the first converter is connected with the first end of the power grid. The first end of the battery assembly is connected with the first input end of the second converter, the second end of the battery assembly is connected with the second input end of the second converter, the first output end of the second converter is connected with the second output end of the first converter, and the second output end of the second converter is connected with the second end of the power grid. The control module is connected with the first converter and the second converter, and the first converter in the battery module and the second converter in the photovoltaic module are controlled to enable the photovoltaic module and/or the battery module to discharge the power grid, or enable the power grid and the photovoltaic module to charge the battery module, or enable the power grid to charge the battery module, so that the power interaction requirement with the power grid is met through the converter of the battery module and the converter of the photovoltaic module, namely, the flexible adaptive operation of multiple degrees of freedom is met based on the alternating-current side coupling of the photovoltaic module and the battery module on the premise that no additional converter is added.
Drawings
For a clearer description of the present application or of the prior art, the drawings that are used in the description of the embodiments or of the prior art will be briefly described, it being apparent that the drawings in the description below are some embodiments of the present application, and that other drawings may be obtained from these drawings without inventive effort for a person skilled in the art.
Fig. 1 to 11 are schematic structural diagrams of an optical storage system according to an embodiment of the present application.
Detailed Description
For the purposes of making the objects, technical solutions and advantages of the present application more apparent, the technical solutions in the present application will be clearly and completely described below with reference to the drawings in the present application, and it is apparent that the described embodiments are some, but not all, embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.
As described in the background art, the low-voltage direct current generated by the photovoltaic module is coupled with the energy storage battery in the direct current convergence cabinet after passing through the direct current-direct current converter, and then is output with alternating voltage through the unified direct current-alternating current converter, and is connected to the low-voltage winding of the transformer. Thus, the dc-coupled optical storage system comprises at least a dc-dc converter, a dc-ac converter and an ac-ac converter.
And the photovoltaic inverter and the energy storage inverter respectively invert low-voltage direct current output by the photovoltaic module and the energy storage battery to output the same-voltage alternating current, and the same-voltage alternating current is then converged into a transformer low-voltage winding after being coupled by the alternating current convergence cabinet. Thus, an ac-coupled optical storage system comprises at least a dc-ac converter and an ac-ac converter.
Therefore, no matter what kind of system, a plurality of converters exist at the same time, which increases the complexity of the optical storage system and affects the installation and maintenance of the optical storage system.
To above-mentioned problem, the application provides a light stores up system, including photovoltaic module, battery module and control module, photovoltaic module includes photovoltaic module and first converter, battery module includes battery module and second converter, the first end of electric wire netting is connected to the first output of first converter, the second end of electric wire netting is connected to the second output of second converter, control module connects first converter and second converter, thereby realize multiple flexible operation mode through the converter that control battery module was taken and the converter that photovoltaic module was taken certainly, reach the power interaction demand with the electric wire netting.
The technical scheme of the present application is described in detail below with specific examples. The following embodiments may be combined with each other, and some embodiments may not be repeated for the same or similar concepts or processes.
The battery pack of the present invention refers to: the battery component selected by the invention can comprise a plurality of battery packs connected in series and in parallel, for example, 48 single battery cells are connected in series to form a battery pack and then connected in parallel with another 1 battery pack, 52 single battery cells are connected in series to form a battery pack and then connected in parallel with another 1 battery pack, and the like, 50-100 single battery cells can be selected to be connected in series, and a battery cluster (for example, 8 battery packs) can be selected, however, considering the actual operation and the application of the system, the 2 battery packs connected in series preferably comprise 96 or 104 single battery cells in total, the voltage of the 2 battery packs connected in series is about 300V, and the rationality and feasibility of the whole optical storage system are improved. The battery pack can be an existing single energy storage battery pack.
The photovoltaic module of the invention refers to: the array formed by the solar photovoltaic panels does not need to carry out additional boosting devices, namely DCDC (direct current) boosting treatment, and can obtain a required voltage value only by simple series-parallel connection, preferably, the voltage phase difference between the voltage output by the solar photovoltaic panels after series-parallel connection and the voltage output by the battery assembly is smaller, namely, if the battery assembly is selected to be 300-400V voltage value interval, the voltage value of the solar photovoltaic panels can also be selected to be 300-400V voltage value interval. Under the condition, the output maximum power of the photovoltaic module is basically consistent with the output maximum power of the battery module, so that the regulation and control of the whole light storage system can be smoother and more reasonable.
Fig. 1 shows a schematic structural diagram of an optical storage system according to an embodiment of the present application. As shown in fig. 1, an optical storage system provided in an embodiment of the present application includes:
the photovoltaic module 10, the battery module 20 and the control module, the photovoltaic module 10 comprises a photovoltaic module 101 and a first current transformer 102, and the battery module 20 comprises a battery module 201 and a second current transformer 202;
the first end of the photovoltaic module 101 is connected with the first input end of the first converter 102, the second end of the photovoltaic module 101 is connected with the second input end of the first converter 102, and the first output end of the first converter 102 is connected with the first end of the power grid 30;
the first end of the battery assembly 201 is connected with the first input end of the second current transformer 202, the second end of the battery assembly 201 is connected with the second input end of the second current transformer 202, the first output end of the second current transformer 202 is connected with the second output end of the first current transformer 102, and the second output end of the second current transformer 202 is connected with the second end of the power grid 30;
the control module is connected to the first converter 102 and the second converter 202, and is configured to discharge the photovoltaic module 101 and/or the battery module 201 to the power grid 30, charge the power grid 30 and the photovoltaic module 101 to the battery module 201, or charge the power grid 30 to the battery module 201 by controlling the first converter 102 and the second converter 202.
In this embodiment, the control module controls the first converter 102 and the second converter 202, so that the light storage system is in a mode of discharging the photovoltaic module 101 and the battery module 201 to the power grid 30, or in a mode of discharging the photovoltaic module 101 to the power grid 30, or in a mode of discharging the battery module 201 to the power grid 30, or in a mode of charging the power grid 30 and the photovoltaic module 101 to the battery module 201, or in a mode of charging the power grid 30 to the battery module 201.
In some embodiments, as shown in fig. 1, first converter 102 includes a first upper leg 103 and a first lower leg 104, first upper leg 103 includes a first switching element S1a and a third switching element S3a, and first lower leg 104 includes a second switching element S2a and a fourth switching element S4a. A first end of the first switching element S1a is connected to a first end of the third switching element S3a, and is used as a first input end of the first converter 102; the second end of the first switching element S1a is connected to the first end of the second switching element S2a, and is used as a first output end of the first converter 102; a second end of the second switching element S2a is connected to a second end of the fourth switching element S4a, and is used as a second input end of the first converter 102; the second terminal of the third switching element S3a is connected to the first terminal of the fourth switching element S4a as the second output terminal of the first converter 102. In this embodiment, the control module is connected to the control terminal of the first switching element S1a, the control terminal of the second switching element S2a, the control terminal of the third switching element S3a, and the control terminal of the fourth switching element S4a, and is configured to discharge the photovoltaic module 101 to the power grid 30 or charge the battery module 201 by controlling the first switching element S1a to be turned on or off, the second switching element S2a to be turned on or off, the third switching element S3a to be turned on or off, and the fourth switching element S4a to be turned on or off. Of course, the operation of the photovoltaic module 101 may also be stopped by controlling the first switching element S1a and the third switching element S3a to be closed, or the second switching element S2a and the fourth switching element S4a to be closed.
In general, in the case of ac series connection, the ac current is the same, and the voltage is different, so that the power output by the photovoltaic module 101 and the power output by the battery module 201 can be regulated and controlled according to actual requirements. Wherein the battery assembly 201 is an energy storage assembly having a corresponding maximum power; the photovoltaic module 101 does not store electric energy, and the output power is implementation power, and is used for regulating and controlling the discharging power of the power grid 30 and the charging power of the battery module 201, and the maximum allowable power is not exceeded when regulating and controlling the discharging power of the power grid 30 or the charging power of the battery module 201. In practical application, the photovoltaic module 101 is in a working state in daytime, stops running at night, and does not store electric energy.
In some embodiments, as shown in fig. 1, second converter 202 includes a second upper leg 203 and a second lower leg 204, second upper leg 203 includes a fifth switching element S1b and a seventh switching element S3b, and second lower leg 204 includes a sixth switching element S2b and an eighth switching element S4b. A first end of the fifth switching element S1b is connected to a first end of the seventh switching element S3b, and is used as a first input end of the second converter 202; the second end of the fifth switching element S1b is connected to the first end of the sixth switching element S2b, and is used as the first output end of the second converter 202; a second terminal of the sixth switching element S2b is connected to a second terminal of the eighth switching element S4b, and is used as a second input terminal of the second converter 202; the second terminal of the seventh switching element S3b is connected to the first terminal of the eighth switching element S4b as the second output terminal of the second converter 202. The control module is connected to the control terminal of the fifth switching element S1b, the control terminal of the sixth switching element S2b, the control terminal of the seventh switching element S3b and the control terminal of the eighth switching element S4b, and is configured to discharge the battery assembly 201 to the grid 30, charge the grid 30 and the photovoltaic assembly 101 by controlling the closing or opening of the fifth switching element S1b, the closing or opening of the sixth switching element S2b, the closing or opening of the seventh switching element S3b, and the closing or opening of the eighth switching element S4b. Likewise, the battery assembly 201 may be stopped by controlling the fifth switching element S1b and the seventh switching element S3b to be closed, or the sixth switching element S2b and the eighth switching element S4b to be closed. The battery assembly 201 stopping operation may be understood as stopping the battery assembly 201 discharging the power grid 30 or not charging the battery assembly 201.
In this embodiment, the first converter 102 includes a first upper leg 103 and a first lower leg 104, the first upper leg 103 includes a first switching element S1a and a third switching element S3a, and the first lower leg 104 includes a second switching element S2a and a fourth switching element S4a. The second converter 202 comprises a second upper leg 203 and a second lower leg 204, the second upper leg 203 comprising a fifth switching element S1b and a seventh switching element S3b, and the second lower leg 204 comprising a sixth switching element S2b and an eighth switching element S4b. The connection relationship between the switching elements is as in the above embodiment.
The first end of the photovoltaic module 101 is an anode end of the photovoltaic module 101, the second end of the photovoltaic module 101 is a cathode end of the photovoltaic module 101, the first end of the battery module 201 is an anode end of the battery module 201, the second end of the battery module 201 is a cathode end of the battery module 201, the first end of the power grid 30 is an anode end of the power grid 30, and the second end of the power grid 30 is a cathode end of the power grid 30.
Therefore, in some embodiments, the control module may control the first converter 102 and the second converter 202 to be in an operating state, so that the photovoltaic module 101 and the battery module 201 discharge the power grid 30, as shown in fig. 2, at this time, the first converter 102 and the second converter 202 are in an inversion state, the currents of the photovoltaic module 101 and the battery module 201 are kept consistent because of the series connection, and the voltage and the current of the photovoltaic module 101 are in phase, the voltage and the current of the battery module 201 are also in phase, the power flow direction of the photovoltaic module 101 is the photovoltaic module 101 to the power grid 30, and the power flow direction of the battery module 201 is the battery module 201 to the power grid. The first converter 102 may be controlled to be in an operating state by continuously controlling the first switching element S1a to be turned on or off, the second switching element S2a to be turned on or off, the third switching element S3a to be turned on or off, and the fourth switching element S4a to be turned on or off, that is, to exhibit different voltages and currents through continuous chopping. The control of the second converter 202 in the operating state may be achieved by continuously controlling the closing or opening of the fifth switching element S1b, the closing or opening of the sixth switching element S2b, the seventh switching element S3b, and the closing or opening of the eighth switching element S4b.
In some embodiments, the control module controls the second switching element S2a and the fourth switching element S4a to be closed, and the first switching element S1a and the third switching element S3a to be opened, so that the photovoltaic module 101 stops operating. At the same time, the control module controls the second converter 202 to be in an operating state, so that the battery assembly 201 discharges to the power grid 30, as shown in fig. 3. Or, the first switching element S1a and the third switching element S3a are controlled to be closed, the second switching element S2a and the fourth switching element S4a are opened, as shown in fig. 4, so that the photovoltaic module 101 stops running, and at the same time, the control module controls the second converter 202 to be in an operating state, so that the battery assembly 201 discharges electricity to the grid 30. At this time, the second converter 202 is in an inversion state, the currents of the photovoltaic module 101 and the battery module 201 are kept consistent because of the series connection, and the voltage and the current of the battery module 201 are in phase, the power of the photovoltaic module 101 is 0, and the power flow direction of the battery module 201 is from the battery module 201 to the power grid 30. For example, the first converter 102 may be controlled to be in a non-operating state by short-circuiting an IGBT (insulated gate bipolar transistor) that is a normal switch, and may be normally open or normally closed.
In practical application, when the photovoltaic module cannot normally work in a night scene, the lower bridge arm of the first converter 102 may be closed at this time, that is, the second switching element S2a and the fourth switching element S4a may be closed, or the upper bridge arm of the first converter 102 may be closed, that is, the first switching element S1a and the third switching element S3a may be closed, so that the photovoltaic module 10 bypasses and is cut out, and it is ensured that the battery module 20 is not affected by the photovoltaic module 10 and keeps normal operation.
In some embodiments, the control module controls the first converter 102 to be in an operating state, and simultaneously controls the sixth switching element S2b and the eighth switching element S4b to be closed, and controls the fifth switching element S1b and the seventh switching element S3b to be opened, as shown in fig. 5, so that the battery assembly 201 stops operating, and the photovoltaic assembly 101 discharges the power grid 30. Or, the first converter 102 is controlled to be in an operating state, the fifth switching element S1b and the seventh switching element S3b are controlled to be closed, the sixth switching element S2b and the eighth switching element S4b are controlled to be opened, as shown in fig. 6, so that the battery assembly 201 stops operating, and the photovoltaic assembly 101 discharges the power grid 30. At this time, the first converter 102 is in an inversion state, the currents of the photovoltaic module 101 and the battery module 201 are kept consistent because of the series connection, the voltage and the current of the photovoltaic module 101 are in phase, the power of the battery module 201 is 0, and the power flow direction of the photovoltaic module 101 is from the photovoltaic module 101 to the power grid 30. For example, the second converter 202 may be controlled to be in a non-operating state by IGBT shorting.
In some embodiments, the control module controls the second switching element S2a and the fourth switching element S4a to be closed, and the first switching element S1a and the third switching element S3a to be opened, so that the photovoltaic module 101 stops operating. At the same time, the control module controls the second converter 202 to be in an operating state, so that the power grid 30 charges the battery assembly 101, as shown in fig. 7. Or, the first switching element S1a and the third switching element S3a are controlled to be closed, the second switching element S2a and the fourth switching element S4a are opened, so that the photovoltaic module 101 stops running, and meanwhile, the control module controls the second converter 202 to be in an operating state, so that the power grid 30 charges the battery module 101, as shown in fig. 8. At this time, the second converter 202 is in a rectifying state, the currents of the photovoltaic module 101 and the battery module 201 are kept consistent because of the series connection, and the voltage and the current of the battery module 201 are 180 ° different in phase, the ac voltage of the battery module 201 is 0, the power of the photovoltaic module 101 is 0, and the power flow direction of the battery module 201 is the power grid 30 to the battery module 201.
In some embodiments, the control module controls the first converter 102 and the second converter 202 to be in an operating state, so that the photovoltaic module 101 and the power grid 30 charge the battery module 201, as shown in fig. 8, when the first converter 102 is in an inversion state and the second converter 202 is in a rectification state, currents of the photovoltaic module 101 and the battery module 201 are kept consistent due to series connection, voltages and currents of the photovoltaic module 101 are in phase, phases of the voltages and the currents of the battery module 201 are 180 ° different, an ac voltage of the battery module 201 is 0, a power flow direction of the photovoltaic module 101 is the photovoltaic module 101 to the power grid 30, and a power flow direction of the battery module 201 is the power grid 30 to the battery module 201.
In some embodiments, the control module controls the amount of electricity discharged by the photovoltaic module to the grid or the amount of electricity charged by the components of the battery pack by controlling the time the first switching element is opened or closed, the time the second switching element is opened or closed, the time the third switching element is opened or closed, and/or the time the fourth switching element is opened or closed. The discharging electric quantity of the battery assembly to the power grid or the charged electric quantity of the battery assembly is controlled by controlling the opening or closing time of the fifth switching element, the opening or closing time of the sixth switching element, the opening or closing time of the seventh switching element and/or the opening or closing time of the eighth switching element.
In practical applications, the first switching element S1a, the second switching element S2a, the third switching element S3a, the fourth switching element S4a, the fifth switching element S1b, the sixth switching element S2b, the seventh switching element S3b and the eighth switching element S4b may be MOS transistors, and the control module may include a plurality of independent sub-control modules, where each sub-control module is connected to a control end of one switching element and is used to individually control on or off of each switching element.
In some embodiments, the number of photovoltaic modules is a plurality, each photovoltaic module includes a photovoltaic module and a first converter, each photovoltaic module may be cascaded with each other, a first output end of the first converter of a first photovoltaic module is connected to a first end of the power grid, a second output end of the first converter of a last photovoltaic module is connected to a first output end of the first converter of a next photovoltaic module, and a second output end of the first converter of a last photovoltaic module is connected to a first output end of the second converter of the battery module. The control module is connected with each first converter and is used for enabling the photovoltaic component corresponding to each first converter to discharge the battery or charge the battery component by controlling each first converter. It should be noted that when the number of the photovoltaic modules is plural, each photovoltaic module may be independent from each other, and whether each photovoltaic module is in a working state is not affected by other photovoltaic modules.
For example, the first converter in each photovoltaic module may include a first upper leg including a first switching element and a third switching element and a first lower leg including a second switching element and a fourth switching element. The connection relation of the switching elements is as in the above embodiment.
The photovoltaic module can control the opening or closing of the first switching element, the opening or closing of the second switching element, the opening or closing of the third switching element and the opening or closing of the fourth switching element in the first converter to control the photovoltaic module to discharge the power grid or charge the battery, and specific control logic is as in the embodiment. For any photovoltaic module which does not need to be in a working state, the upper bridge arm or the lower bridge arm of the first converter can be controlled to be closed.
In some embodiments, the number of battery modules is a plurality, each battery module includes a battery assembly and a second converter, each battery module may be cascaded with each other, a first output end of the second converter of a first battery module is connected to a second output end of the first converter of the photovoltaic module, a second output end of the second converter of a last battery module is connected to a first output end of the second converter of a next battery module, and a second output end of the second converter of a last battery module is connected to a second end of the power grid. The control module is connected with each second converter and is used for discharging the power grid by controlling the battery assembly corresponding to each second converter, or enabling the battery assembly corresponding to each second converter to be charged, for example, by the power grid and the photovoltaic assembly, or by the power grid. Each battery module can be mutually independent, and whether each battery module is in a working state is not influenced by other battery modules, so that the control module can control the working state of the corresponding battery module by controlling any second converter.
For example, the second current transformer in each battery module may include a second upper leg including a fifth switch and a seventh switch element and a second lower leg including a sixth switch element and an eighth switch element. The connection relation of the switching elements is as in the above embodiment.
Similarly to the photovoltaic module, for any battery module that needs to be in operation, the opening or closing of the fifth switching element, the opening or closing of the sixth switching element, the opening or closing of the seventh switching element, and the opening or closing of the eighth switching element in the second converter can be controlled to control the discharge or the charge of the battery assembly to the grid, and the specific control logic is as in the above embodiment. For any battery module which does not need to be in a working state, the upper bridge arm or the lower bridge arm in the second converter can be controlled to be closed.
In a specific embodiment, the light storage system includes two photovoltaic modules and two battery modules, as shown in fig. 9, a first end of the photovoltaic module 110 of the first photovoltaic module and a first input end of the first converter are connected to each other; the second end of the photovoltaic module 110 of the first photovoltaic module and the second input end of the first converter are connected to each other; the first output end of the first converter of the first photovoltaic module is connected to a first end of the power grid 30; the second output end of the first converter of the first photovoltaic module is connected with the first output end of the first converter of the second photovoltaic module. The first end of the photovoltaic module 120 of the second photovoltaic module is connected to the first input of the first current transformer, the second end of the photovoltaic module 120 of the second photovoltaic module is connected to the second input of the first current transformer, and the second output of the second current transformer of the second photovoltaic module is connected to the first output of the second current transformer of the first battery module. The first end of the battery assembly 210 of the first battery module and the first input end of the second current transformer are connected to each other, and the second end of the battery assembly 210 of the first battery module and the second input end of the second current transformer are connected to each other, and the second output end of the second current transformer of the first battery module is connected to the first output end of the second current transformer of the second battery module. The first end of the battery assembly 220 of the second battery module is connected to the first input of the second current transformer, the second end of the battery assembly 220 of the second battery module is connected to the second input of the second current transformer, and the second output of the second current transformer of the second battery module is connected to the second end of the power grid.
For example, the first converter of the first photovoltaic module and the first converter of the second photovoltaic module may each comprise a first switching element, a second switching element, a third switching element and a fourth switching element.
In practical application, the first photovoltaic module and the second photovoltaic module can discharge the power grid at the same time, or the first photovoltaic module discharges the power grid, the second photovoltaic module stops running, or the first photovoltaic module stops running, and the second photovoltaic module discharges the power grid. The first photovoltaic module and the second photovoltaic module can charge the battery assembly at the same time, or the first photovoltaic module charges the battery assembly, the second photovoltaic module stops running, or the first photovoltaic module stops running, and the second photovoltaic module charges the battery assembly.
When the first photovoltaic module and the second photovoltaic module discharge the power grid at the same time, as shown in fig. 9, the first converter of the first photovoltaic module is in an operating state, and meanwhile, the first converter of the second photovoltaic module is in an operating state, so that the photovoltaic modules in the first photovoltaic module and the second photovoltaic module discharge the power grid at the same time. When a plurality of photovoltaic modules such as a third photovoltaic module and a fourth photovoltaic module are further included, the power grid can be discharged through the plurality of photovoltaic modules at the same time.
When the first photovoltaic module discharges to the power grid and the second photovoltaic module stops operating, as shown in fig. 10, the first converter of the first photovoltaic module is in an operating state, meanwhile, the first switching element S1c and the third switching element S3c in the first converter of the second photovoltaic module are opened, and the second switching element S2c and the fourth switching element S4c are closed, so that the photovoltaic module 110 in the first photovoltaic module discharges to the power grid 30, and the second photovoltaic module stops operating.
When the first photovoltaic module and the second photovoltaic module charge the battery assembly, as shown in fig. 11, the first current transformer of the first photovoltaic module is in an operating state, and at the same time, the first current transformer of the second photovoltaic module is in an operating state, so that the photovoltaic assemblies in the first photovoltaic module and the second photovoltaic module charge the battery assembly at the same time.
For example, the second current transformer of the first battery module and the second current transformer of the second battery module may each include a fifth switching element, a sixth switching element, a seventh switching element, and an eighth switching element.
In practical application, the first battery module and the second battery module can discharge the power grid at the same time, or the first battery module discharges the power grid, the second battery module stops running, or the first battery module stops running, and the second battery module discharges the power grid. The first battery module and the second battery module may be charged at the same time, or the first battery module may be charged, the second battery module may be stopped, or the first battery module may be stopped, and the second battery module may be charged.
When the first battery module and the second battery module discharge the power grid at the same time, as shown in fig. 9, the second converter of the first battery module is in an operating state, and at the same time, the second converter of the second battery module is in an operating state, so that the battery assemblies in the first battery module and the second battery module discharge the power grid at the same time. When a plurality of battery modules such as a third battery module and a fourth battery module are further included, the electric grid can be discharged simultaneously through the plurality of battery modules.
When the first battery module discharges to the power grid and the second battery module stops operating, as shown in fig. 10, the second converter of the first battery module is in an operating state, and at the same time, the fifth switching element S1d and the seventh switching element S3d in the second converter of the second battery module are opened, and the sixth switching element S2d and the eighth switching element S3d are closed, so that the battery assembly in the first battery module discharges to the power grid, and the second battery module stops operating.
When the first battery module and the second battery module are charged, as shown in fig. 11, the second current transformer of the first battery module is in an operating state, and at the same time, the second current transformer of the second battery module is in an operating state, so that the battery assemblies in the first battery module and the second battery module are charged at the same time.
It will be appreciated that the light storage system may comprise a plurality of photovoltaic modules and a plurality of battery modules, each connected in series to provide the required power for the grid. The photovoltaic modules of the photovoltaic modules may be the same or different, and the battery modules of the battery modules may be the same or different.
The light storage system provided by the embodiment of the application is described in detail above, and the power interaction requirement with the power grid is met through the converter of the battery module and the converter of the photovoltaic module, namely, the flexible adaptive operation with multiple degrees of freedom is met based on the alternating current side coupling of the photovoltaic module and the battery module on the premise that no additional converter is added.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and are not limited thereto. Although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments may be modified or some or all of the technical features may be replaced with equivalents. Such modifications and substitutions do not depart from the spirit of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims (10)

1. A light storage system, the light storage system comprising:
the photovoltaic module comprises a photovoltaic assembly and a first converter, and the battery module comprises a battery assembly and a second converter;
the first end of the photovoltaic module is connected with the first input end of the first converter, the second end of the photovoltaic module is connected with the second input end of the first converter, and the first output end of the first converter is connected with the first end of the power grid;
the first end of the battery assembly is connected with the first input end of the second current transformer, the second end of the battery assembly is connected with the second input end of the second current transformer, the first output end of the second current transformer is connected with the second output end of the first current transformer, and the second output end of the second current transformer is connected with the second end of the power grid;
the control module is connected with the first converter and the second converter and is used for enabling the photovoltaic assembly and/or the battery assembly to discharge the power grid, enabling the power grid and the photovoltaic assembly to charge the battery assembly or enabling the power grid to charge the battery assembly through controlling the first converter and the second converter.
2. The light storage system of claim 1 wherein the number of photovoltaic modules is a plurality, each photovoltaic module comprising a photovoltaic assembly and a first current transformer;
the first output end of the first converter of the first photovoltaic module is connected with the first end of the power grid;
the second output end of the first converter of the last photovoltaic module is connected with the first output end of the first converter of the next photovoltaic module;
the second output end of the first converter of the last photovoltaic module is connected with the first output end of the second converter of the battery module;
the control module is connected with each first converter, and the control module is used for enabling the photovoltaic assembly corresponding to each first converter to discharge the power grid or charge the battery assembly by controlling each first converter.
3. The light storage system of claim 2 wherein the number of battery modules is a plurality, each battery module comprising a battery assembly and a second current transformer;
the first output end of the second current transformer of the first battery module is connected with the second output end of the first current transformer of the photovoltaic module;
the second output end of the second current transformer of the previous battery module is connected with the first output end of the second current transformer of the next battery module;
The second output end of the second converter of the last battery module is connected with the second end of the power grid;
the control module is connected with each second converter and is used for enabling the battery assembly corresponding to each second converter to discharge the power grid or enabling the battery assembly corresponding to each second converter to be charged by controlling each second converter.
4. A light and storage system as claimed in claim 3, wherein,
the first converter comprises a first upper bridge arm and a first lower bridge arm, the first upper bridge arm comprises a first switching element and a third switching element, and the first lower bridge arm comprises a second switching element and a fourth switching element;
the first end of the first switching element is connected with the first end of the third switching element and is used as a first input end of the first converter;
the second end of the first switching element is connected with the first end of the second switching element and is used as a first output end of the first converter;
the second end of the second switching element is connected with the second end of the fourth switching element and is used as a second input end of the first converter;
the second end of the third switching element is connected with the first end of the fourth switching element and is used as a second output end of the first converter;
The control module is connected with the control end of the first switching element, the control end of the second switching element, the control end of the third switching element and the control end of the fourth switching element.
5. The light storage system of claim 4, wherein the control module controls the second switching element and the fourth switching element to be closed or controls the first switching element and the third switching element to be closed to stop the photovoltaic module from operating;
or controlling the first switching element to be closed or opened, the second switching element to be closed or opened, the third switching element to be opened or closed, and/or the fourth switching element to be opened or closed so that the photovoltaic assembly discharges the power grid or charges the battery assembly.
6. The light and storage system of claim 4 wherein the light and storage system is configured to store light and storage light,
the second converter comprises a second upper bridge arm and a second lower bridge arm, the second upper bridge arm comprises a fifth switching element and a seventh switching element, and the second lower bridge arm comprises a sixth switching element and an eighth switching element;
the first end of the fifth switching element is connected with the first end of the seventh switching element and is used as the first input end of the second converter;
The second end of the fifth switching element is connected with the first end of the sixth switching element and is used as a first output end of the second converter;
a second end of the sixth switching element is connected with a second end of the eighth switching element and is used as a second input end of the second converter;
the second end of the seventh switching element is connected with the first end of the eighth switching element and is used as a second output end of the second converter;
the control module is connected with the control end of the fifth switching element, the control end of the sixth switching element, the control end of the seventh switching element and the control end of the eighth switching element.
7. A light storage system as recited in claim 6, wherein the control module controls the fifth and seventh switching elements to be closed or the sixth and eighth switching elements to be closed to deactivate the battery assembly;
or controlling the fifth switching element to be closed or opened, the sixth switching element to be closed or opened, the seventh switching element to be closed or opened, and/or the eighth switching element to be closed or opened to discharge the battery assembly to the power grid or to charge the battery assembly.
8. A light storage system as recited in claim 5, wherein said control module is specifically configured to control a time when said first switching element is opened or closed, a time when said second switching element is opened or closed, a time when said third switching element is opened or closed, and/or a time when said fourth switching element is opened or closed, to control a discharge power of said photovoltaic assembly to said power grid or a charge power of said battery assembly.
9. A light storage system as recited in claim 7, wherein said control module is specifically configured to control a time at which said fifth switching element is opened or closed, a time at which said sixth switching element is opened or closed, a time at which said seventh switching element is opened or closed, and/or a time at which said eighth switching element is opened or closed, to control a discharge amount of said battery assembly to said power grid or to control a charged amount of said battery assembly.
10. The light storage system of claim 6 wherein the first switching element, the second switching element, the third switching element, the fourth switching element, the fifth switching element, the sixth switching element, the seventh switching element, and the eighth switching element are MOS transistors.
CN202311597036.8A 2023-11-27 2023-11-27 Optical storage system Pending CN117613977A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202311597036.8A CN117613977A (en) 2023-11-27 2023-11-27 Optical storage system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202311597036.8A CN117613977A (en) 2023-11-27 2023-11-27 Optical storage system

Publications (1)

Publication Number Publication Date
CN117613977A true CN117613977A (en) 2024-02-27

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Family Applications (1)

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