CN117293786A - Light stores up fills system - Google Patents
Light stores up fills system Download PDFInfo
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- CN117293786A CN117293786A CN202311278305.4A CN202311278305A CN117293786A CN 117293786 A CN117293786 A CN 117293786A CN 202311278305 A CN202311278305 A CN 202311278305A CN 117293786 A CN117293786 A CN 117293786A
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- 238000004146 energy storage Methods 0.000 claims abstract description 63
- 230000002457 bidirectional effect Effects 0.000 claims abstract description 37
- 230000003287 optical effect Effects 0.000 claims abstract description 37
- 230000007935 neutral effect Effects 0.000 claims description 50
- 238000004891 communication Methods 0.000 claims description 6
- 238000003306 harvesting Methods 0.000 claims 1
- 238000000034 method Methods 0.000 description 8
- 230000005611 electricity Effects 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 230000002159 abnormal effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000005684 electric field Effects 0.000 description 3
- 238000005286 illumination Methods 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 238000012806 monitoring device Methods 0.000 description 2
- 238000000429 assembly Methods 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009877 rendering Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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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
- H02J1/00—Circuit arrangements for DC mains or DC distribution networks
- H02J1/14—Balancing the load in a network
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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
- H02J1/00—Circuit arrangements for DC mains or DC distribution networks
- H02J1/08—Three-wire systems; Systems having more than three wires
-
- 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
- H02J1/00—Circuit arrangements for DC mains or DC distribution networks
- H02J1/10—Parallel operation of DC sources
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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
- H02J1/00—Circuit arrangements for DC mains or DC distribution networks
- H02J1/10—Parallel operation of DC sources
- H02J1/12—Parallel operation of DC generators with converters, e.g. with mercury-arc rectifier
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for AC mains or AC distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J5/00—Circuit arrangements for transfer of electric power between AC networks and DC networks
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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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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The application relates to the technical field of optical storage and charging, in particular to an optical storage and charging system, which comprises a three-wire system direct current bus, a photovoltaic DC/DC converter, an energy storage DC/DC bidirectional converter and an inverter, wherein voltages of a direct current positive bus, a direct current negative bus and a midpoint zero line of the three-wire system direct current bus are alternately generated by the photovoltaic DC/DC converter, the energy storage DC/DC bidirectional converter and the inverter. The light storage and charging system can be suitable for an alternating current power grid power utilization scene and a direct current micro-grid power utilization scene, and can generate three voltages so as to be compatible with power utilization requirements of different bus voltages.
Description
Technical Field
The application relates to the technical field of optical storage and filling, in particular to an optical storage and filling system.
Background
The photo-storage charging product comprises a photovoltaic inverter, an energy storage battery box, an electric automobile DC charging pile and an AC power grid access box. The existing products generally use alternating current buses or direct current two-wire buses (namely direct current positive and negative buses), the voltage of the buses with the structure can be fixed in a range, and the voltage range is relatively narrow, so that various use scenes of users are relatively single at present, for example, a 500V direct current bus solar photovoltaic module can only use a 500V voltage system, an energy storage battery system can only use a 500V direct current system, and flexible access cannot be achieved. When the existing two-wire system light storage and charging system is off-grid in an alternating current public power grid, the whole system may form an IT power system, and when the electric field scene of a user side is a TN system or a TT system, an insulation monitoring device needs to be added to ensure the electricity safety of the user side.
In addition, the neutral point zero line of the current three-wire system direct current bus is manufactured by using an alternating current-to-direct current power converter of an alternating current power grid access point, and the structure is suitable for the power utilization field of an alternating current public power grid, but is not suitable in the power utilization field of a direct current micro-grid, because the alternating current power grid possibly has the off-grid condition, the alternating current power grid access point does not work normally when the condition occurs, and the neutral point zero line cannot work at the moment.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, an object of the present application is to provide an optical storage and charging system, which is used for solving the technical problems that the voltage range of the two-wire optical storage and charging system in the existing optical storage and charging system is narrow, the application scenario is single, the safety risk of electricity consumption exists when the ac public power grid is disconnected, and the three-wire optical storage and charging system is not suitable for the electricity scenario of the dc micro-grid.
To achieve the above and other related objects, the present application provides an optical storage and filling system comprising:
the three-wire system direct current bus comprises a direct current positive bus, a direct current negative bus and a neutral point zero line;
the output end of the photovoltaic DC/DC converter is connected with the three-wire system direct current bus, and the input end of the photovoltaic DC/DC converter is connected with the photovoltaic module;
the energy storage DC/DC bidirectional converter is characterized in that one end of the energy storage DC/DC bidirectional converter is connected with the three-wire system direct current bus, and the other end of the energy storage DC/DC bidirectional converter is connected with an energy storage battery;
the direct current end of the inverter is connected with the three-wire system direct current bus, and the alternating current end of the inverter is connected with an alternating current public power grid;
the voltages of the direct current positive bus, the direct current negative bus and the neutral point zero line of the three-wire direct current bus are alternately generated by the photovoltaic DC/DC converter, the energy storage DC/DC bidirectional converter and the inverter.
In an alternative embodiment of the present application, the charging DC/DC converter is further comprised, a first end of the charging DC/DC converter is connected to the three-wire DC bus, and a second end is connected to a charging interface of the electric vehicle.
In an optional embodiment of the present application, a connection manner of the charging DC/DC converter and the three-wire DC bus includes:
the positive electrode and the negative electrode of the first end of the charging DC/DC converter are respectively connected with the direct current positive bus and the direct current negative bus; or (b)
The positive electrode and the negative electrode of the first end of the charging DC/DC converter are respectively connected with the direct current positive bus and the neutral point zero line; or (b)
And the positive electrode and the negative electrode of the first end of the charging DC/DC converter are respectively connected with the direct current negative electrode bus and the neutral point zero line.
In an optional embodiment of the present application, the power inverter further includes a subscriber side junction box, and the ac terminal of the inverter is connected to the ac public power grid through the subscriber side junction box.
In an alternative embodiment of the present application, the three-wire dc bus is interfaced with a dc micro-grid of the subscriber-side junction box.
In an optional embodiment of the present application, the system further includes a dc breaker, and the three-wire dc bus is connected to the dc micro-grid interface of the subscriber side junction box through the dc breaker.
In an optional embodiment of the present application, the direct current micro-grid connection system further includes a direct current leakage switch, and the three-wire system direct current bus is connected with the direct current micro-grid interface of the user side junction box through the direct current breaker and the direct current leakage switch in sequence.
In an optional embodiment of the present application, the photovoltaic DC/DC converter includes a plurality of output terminals of at least one photovoltaic DC/DC converter are connected to the DC positive bus, the DC negative bus and the neutral point zero line, and the remaining output terminals of the photovoltaic DC/DC converter are connected to the DC positive bus and the DC negative bus.
In an optional embodiment of the present application, the energy storage DC/DC bidirectional converter includes a plurality of energy storage DC/DC bidirectional converters, one end of at least one of the energy storage DC/DC bidirectional converters is connected to the direct current positive bus, the direct current negative bus and the midpoint neutral line, and the other end is connected to the corresponding energy storage battery;
and one end of the rest energy storage DC/DC bidirectional converters is connected with the direct current positive bus and the direct current negative bus, and the other end of the rest energy storage DC/DC bidirectional converters is connected with the corresponding energy storage batteries.
In an alternative embodiment of the present application, the ground bus is connected to the photovoltaic DC/DC converter, the energy storage DC/DC bi-directional converter and the electrical load, respectively.
In an optional embodiment of the present application, a ground switch is further included, and the ground switch is configured to control a communication state between the ground bus and the neutral point zero line.
To achieve the above and other related objects, the present application provides an optical storage and filling system, which adopts the above optical storage and filling system.
The light stores up fills system of this application adopts three-wire system direct current busbar, and direct current positive busbar, direct current negative busbar and midpoint zero line's voltage is produced by photovoltaic DC/DC converter, the DC/DC bidirectional transducer of energy storage battery box energy storage and the DC-to-ac converter of electric wire netting access point department in turn, and this kind of light stores up fills system both can be applicable to alternating current electric wire netting and uses electric field scene, also can be applicable to direct current micro-grid and uses electric field scene to the light stores up the system of this application can produce three kinds of voltages, with the power consumption demand of compatible different busbar voltage.
According to the optical storage charging system, the communication state between the grounding bus and the neutral point zero line is controlled through the grounding switch arranged between the grounding bus and the neutral point zero line, and the switching of the user side between the IT power grid system and the TN power grid system can be controlled, so that the grounding system of the electric equipment flexibly applied to the user side is convenient to exchange public power grid off-grid use scenes.
Drawings
Fig. 1 shows a schematic diagram of an optical storage and filling system under a TN grid system of the present application.
Fig. 2 shows a schematic diagram of an optical storage and filling system under the TT grid system of the present application.
Fig. 3 shows a schematic diagram of an optical storage and filling system under the IT grid system of the present application.
Detailed Description
Other advantages and effects of the present application will become apparent to those skilled in the art from the present disclosure, when the following description of the embodiments is taken in conjunction with the accompanying drawings. The present application may be embodied or carried out in other specific embodiments, and the details of the present application may be modified or changed from various points of view and applications without departing from the spirit of the present application.
As shown in fig. 1-3, an embodiment of the present application discloses a system for optical storage and filling. The light stores up and fills system includes three-wire system direct current busbar to and connect on three-wire system direct current busbar and off-grid control module, photovoltaic module, energy storage module and direct current module that charges.
As shown in fig. 1-3, the three-wire system direct current bus comprises a direct current positive bus 11, a direct current negative bus 12 and a neutral point zero line 13; the voltage of the direct current positive electrode bus 11 to the midpoint zero line 13 is +V, the voltage of the direct current negative electrode bus 12 to the midpoint zero line 13 is-V, and the voltage of the direct current positive electrode bus 11 to the direct current negative electrode bus 12 is 2V, so that three voltages, +V, -V and 2V can be generated, and the electricity consumption scenes of different bus voltages can be met.
As shown in fig. 1-3, the off-grid control module is used as an off-grid controller, one end of the off-grid control module is connected with the three-wire system direct current bus, and the other end of the off-grid control module is connected with the alternating current power grid, and the off-grid control module is used for controlling the connection state of the optical storage and charging system and the alternating current power grid. The parallel-off-grid control module comprises an inverter 2 arranged at an access point of an alternating current power grid and a user side junction box 6, one end of the user side junction box 6 is connected with the alternating current power grid, the other end of the user side junction box is connected with an alternating current end of the inverter 2, a direct current end of the inverter 2 is coupled with the three-wire system direct current bus, the inverter 2 can convert alternating current of the alternating current power grid into direct current and transmit the direct current to the three-wire system direct current bus, and the connection state of the optical storage and charging system and the alternating current power grid is controlled through the user side junction box 6. Specifically, the dc terminals of the inverter 2 are respectively connected to the dc positive bus 11, the dc negative bus 12 and the neutral point zero line 13, and the inverter 2 is configured to generate voltages of the dc positive bus 11, the dc negative bus 12 and the neutral point zero line 13.
As shown in fig. 1-3, the photovoltaic module photovoltaic DC/DC converter 1 is a tracking power converter with a photovoltaic module DC-DC maximum power point, one end of the photovoltaic DC/DC converter 1 is connected with the three-wire DC bus, the other end is externally connected with the photovoltaic module, and the photovoltaic DC/DC converter 1 is used for converting the voltage output by the photovoltaic module into the input voltage of the DC bus.
Specifically, the photovoltaic module may include a plurality of photovoltaic DC/DC converters 1, that is, the photovoltaic storage system includes a plurality of photovoltaic DC/DC converters 1, and at least one output end of the photovoltaic DC/DC converter 1 is connected to the DC positive bus 11, the DC negative bus 12, and the neutral point zero line 13, so as to generate voltages of the DC positive bus 11, the DC negative bus 12, and the neutral point zero line 13, and the other output ends of the photovoltaic DC/DC converters 1 are connected to the DC positive bus 11 and the DC negative bus 12.
As shown in fig. 1-3, the energy storage module is used as an energy storage unit and connected with the three-wire system dc bus, and the energy storage module is used for storing the electric energy output by the three-wire system dc bus or outputting the electric energy to the three-wire system dc bus. Specifically, the energy storage module includes an energy storage battery 4 and an energy storage DC/DC bidirectional converter 3, the energy storage battery 4 is connected with a three-wire system direct current bus through the energy storage DC/DC bidirectional converter 3, the energy storage DC/DC bidirectional converter 3 is used for realizing bidirectional conversion between the voltage of the three-wire system direct current bus and the energy storage voltage of the energy storage battery 4 in the charging and discharging process of the energy storage battery 4, and the energy storage DC/DC bidirectional converter 3 is also used for generating the voltages of the direct current positive bus 11, the direct current negative bus 12 and the neutral point zero line 13.
Specifically, the energy storage modules may include a plurality of energy storage modules, so that the optical storage and charging system includes a plurality of energy storage DC/DC bidirectional converters 3, one end of at least one energy storage DC/DC bidirectional converter 3 is connected to the direct current positive bus 11, the direct current negative bus 12 and the neutral point zero line 13, and the other end is connected to the corresponding energy storage battery 4; and one end of the rest energy storage DC/DC bidirectional converter 3 is connected with the direct current positive bus 11 and the direct current negative bus 12, and the other end is connected with the corresponding energy storage battery 4.
As is clear from the above, as shown in fig. 3, the three-wire DC bus of the optical storage and charging system of the present embodiment, the DC positive bus 11, the DC negative bus 12 and the neutral point 13 may be generated by the photovoltaic DC/DC converter 1, the energy storage DC/DC bidirectional converter 3 and the inverter 2 of the grid access point, so that the voltages of the DC positive bus 11, the DC negative bus 12 and the neutral point 13 may be generated by selecting one of the photovoltaic DC/DC converter 1, the energy storage DC/DC bidirectional converter 3 and the inverter 2 in different scenes, in other words, the voltages of the DC positive bus 11, the DC negative bus 12 and the neutral point 13 of the three-wire DC bus may be alternately generated by the photovoltaic DC/DC converter 1, the energy storage DC/DC bidirectional converter 3 and the inverter 2.
For example, the voltage of the three-wire system direct current bus of the light storage and charging system is generated by the photovoltaic DC/DC converter 1 of the photovoltaic module of the system under the condition of sufficient sunlight illumination in daytime, the input of the photovoltaic DC/DC converter 1 is input with constant current power by the constant current source of the photovoltaic module, and three voltages +V, COM and-V are generated through the power conversion of the photovoltaic DC/DC converter 1 and are input to the direct current positive bus 11, the direct current negative bus 12 and the neutral point zero line 13 to supply power to other power products.
When the photovoltaic DC/DC converter 1 is not in the normal operating range at night or under insufficient sun illumination, the three-wire DC bus three-wire system is generated by the inverter 2 at the grid access point. The input of the inverter 2 is supplied with input power by an alternating current power grid, three voltages of +V, COM and-V are generated through power conversion of the inverter 2 and are input into a direct current positive bus 11, a direct current negative bus 12 and a neutral point zero line 13, and other power products are supplied with power.
When the sunlight is insufficient at night or in the condition of insufficient sunlight, and an off-grid state occurs, the three-wire system direct current bus is generated by the energy storage DC/DC bidirectional converter 3 bidirectional power converter of the energy storage module. The input of the energy storage DC/DC bidirectional converter 3 is provided with input power by an energy storage battery 4 of a corresponding electric energy storage module, three voltages +V, COM and-V are generated through the electric power conversion of the energy storage DC/DC bidirectional converter 3 and are input into a direct current positive bus 11, a direct current negative bus 12 and a neutral point zero line 13, and power is supplied to other electric power products.
As shown in fig. 1-3, the direct current charging module is used as a charging pile and is used for being connected with an electric vehicle to charge the electric vehicle by using electric energy output by the direct current bus, the direct current charging module comprises a charging DC/DC converter 5, one end of the charging DC/DC converter 5 is connected with the three-wire direct current bus, the other end of the charging DC/DC converter is connected with a charging interface of the electric vehicle, and the direct current charging module is used for charging the electric vehicle.
Specifically, since the optical storage and charging system adopts a three-wire system direct current bus, three different connection modes can be adopted between the charging DC/DC converter 5 and the three-wire system direct current bus. One method is that the positive and negative electrodes of the end of the charging DC/DC converter 5 which is not connected to the charging interface of the electric vehicle are connected to the DC positive bus 11 and the DC negative bus 12, respectively, another method is that the positive and negative electrodes of the end of the charging DC/DC converter 5 which is not connected to the charging interface of the electric vehicle are connected to the DC positive bus 11 and the neutral point neutral line 13, respectively, and a third method is that the positive and negative electrodes of the end of the charging DC/DC converter 5 which is not connected to the charging interface of the electric vehicle are connected to the neutral point neutral line 13 and the DC negative bus 12, respectively.
As shown in fig. 1 to 3, in this embodiment, the subscriber side junction box 6 is provided with a dc micro-grid interface, the dc micro-grid interface is used for a subscriber side dc micro-grid usage scenario, and the three-wire dc bus is connected with the dc micro-grid interface of the subscriber side junction box 6, so that power supply to a subscriber dc load can be realized through the subscriber side junction box 6. Specifically, the user can be connected to the electric equipment requiring direct current power supply by the user through the electric terminal of the direct current micro-grid reserved in the user side junction box 6, and the three-wire direct current bus can provide three voltages to be compatible with the electric requirements of different users.
As shown in fig. 1-3, in order to control the communication state and line safety of the three-wire dc bus and the dc micro-grid interface, the optical storage charging system further includes a dc breaker 7 and a dc leakage switch 8, and the three-wire dc bus is connected with the dc micro-grid interface of the subscriber terminal box 6 through the dc breaker 7 and the dc leakage switch 8 in sequence. Of course, in some embodiments, the dc leakage switch 8 may not be provided.
As shown in fig. 1-3, in order to avoid accidents caused by electric leakage, static electricity, etc., the optical storage and charging system may further include a grounding bus 14, where the grounding bus 14 is connected to the photovoltaic DC/DC converter 1, the energy storage DC/DC bidirectional converter 3, and the electrical load, respectively, and grounded.
As shown in fig. 1-3, the optical storage and charging system may further include a ground switch 9, where the ground switch 9 is configured to control a communication state between the ground bus 14 and the neutral point 13. The grounding switch 9 can be used for controlling the switching of the IT system and the TN system at the user side so as to be flexibly applied to the grounding system of the electric equipment at the user side when the alternating current public power grid is in off-grid use scene.
Specifically, as shown in fig. 1, the user side power grid is a TN system, the ground line of the user side is a ground line PE directly connected to the ac utility power grid, and the ground line PE and the neutral line of the ac utility power grid are connected with low impedance. When the abnormal condition occurs to the earth protection line PE and the neutral line of the earth line of the alternating current public power grid, the three phase line and the neutral line of the power grid side are disconnected, at the moment, the optical storage charging system is switched to the off-grid mode, the neutral line in the off-grid mode and the earth line PE of the alternating current public power grid are in a high impedance connection state, the user side becomes an IT system, an insulation resistance monitoring device (IMD device) is required to be additionally arranged on the user side power grid according to the requirement of electric safety, and the neutral point neutral line 13 and the grounding bus 14 in the off-grid state can be reliably connected through the grounding switch 9, so that the user side power grid distribution structure of the TN system is adapted.
As shown in fig. 2, the grounding of the user-side power grid for the TT system i.e. the electrical load is not directly connected to the ground of the power grid but is locally and solely grounded. When the power grid is abnormal, the three phase lines and the neutral lines at the power grid side are disconnected, at the moment, the optical storage and charging system is switched to an off-grid mode, and the ground at the user side or the local ground at the off-grid mode is independently grounded, so that the off-grid mode does not influence the power distribution structure of the power grid at the user side.
As shown in fig. 3, the grounding of the consumer side power grid is that of the IT system, i.e. the electrical load, is not directly connected to the ground of the power grid, but is locally solely grounded, and the ground and neutral lines N of the power grid are high impedance connections (Zpe are high impedance), and the typical IT system distribution structure would require the consumer side to install IMD devices. When the power grid is abnormal, the three phase lines and the neutral line on the power grid side are disconnected, at the moment, the optical storage and charging system is switched to an off-grid mode, and the user side is changed into a TN system. The grounding switch 9 can be opened in the off-grid mode, so that the neutral line and the ground PE in the off-grid state are disconnected, and the high-impedance power distribution structure of the real IT system is restored.
As can be seen from the above, in the optical storage and charging system of the present application, the ground switch 9 disposed between the ground bus 14 and the neutral point neutral line 13 controls the communication state between the ground bus 14 and the neutral point neutral line 13, so that the switching between the IT system and the TN system at the user side can be controlled, and various power distribution TN, IT or TT systems at the user side are compatible, so that the use of the ac public power grid off-grid is convenient, and the system is flexibly applied to the ground system of the electric equipment at the user side.
In the description herein, numerous specific details are provided, such as examples of components and/or methods, to provide a thorough understanding of embodiments of the present application. One skilled in the relevant art will recognize, however, that an embodiment of the application can be practiced without one or more of the specific details, or with other apparatus, systems, components, methods, components, materials, parts, and so forth.
It will also be appreciated that one or more of the elements shown in the figures may also be implemented in a more separated or integrated manner, or even removed because of inoperability in certain circumstances or provided because it may be useful depending on the particular application.
In addition, any labeled arrows in the drawings/figures should be considered only as exemplary, and not limiting, unless otherwise specifically indicated. Furthermore, the term "or" as used herein is generally intended to mean "and/or" unless specified otherwise. Combinations of parts or steps will also be considered as being noted where terminology is foreseen as rendering the ability to separate or combine is unclear.
The above description of illustrated embodiments of the present application, including what is described in the abstract, is not intended to be exhaustive or to limit the application to the precise forms disclosed herein. Although specific embodiments of, and examples for, the application are described herein for illustrative purposes only, various equivalent modifications are possible within the spirit and scope of the present application, as those skilled in the relevant art will recognize and appreciate. As noted, these modifications may be made to the present application in light of the foregoing description of illustrated embodiments of the present application and are to be included within the spirit and scope of the present application.
The systems and methods have been described herein in general terms as being helpful in understanding the details of the present application. Furthermore, various specific details have been given to provide a general understanding of embodiments of the present application. One skilled in the relevant art will recognize, however, that the embodiments of the application can be practiced without one or more of the specific details, or with other apparatus, systems, assemblies, methods, components, materials, parts, and/or the like. In other instances, well-known structures, materials, and/or operations are not specifically shown or described in detail to avoid obscuring aspects of embodiments of the present application.
Thus, although the present application has been described herein with reference to particular embodiments thereof, a latitude of modification, various changes and substitutions are also in the foregoing disclosures, and it will be appreciated that in some instances some features of the application will be employed without a corresponding use of other features without departing from the scope and spirit of the proposed invention. Therefore, many modifications may be made to adapt a particular situation or material to the essential scope and spirit of the present application. It is intended that the application not be limited to the particular terms used in following claims and/or to the particular embodiment disclosed as the best mode contemplated for carrying out this application, but that the application will include any and all embodiments and equivalents falling within the scope of the appended claims. Accordingly, the scope of the present application is to be determined solely by the appended claims.
Claims (11)
1. An optical storage and filling system, comprising:
the three-wire system direct current bus comprises a direct current positive bus, a direct current negative bus and a neutral point zero line;
the output end of the photovoltaic DC/DC converter is connected with the three-wire system direct current bus, and the input end of the photovoltaic DC/DC converter is connected with the photovoltaic module;
the energy storage DC/DC bidirectional converter is characterized in that one end of the energy storage DC/DC bidirectional converter is connected with the three-wire system direct current bus, and the other end of the energy storage DC/DC bidirectional converter is connected with an energy storage battery;
the direct current end of the inverter is connected with the three-wire system direct current bus, and the alternating current end of the inverter is connected with an alternating current public power grid;
the voltages of the direct current positive bus, the direct current negative bus and the neutral point zero line of the three-wire direct current bus are alternately generated by the photovoltaic DC/DC converter, the energy storage DC/DC bidirectional converter and the inverter.
2. The optical storage and charging system of claim 1, further comprising a charging DC/DC converter having a first end connected to the three-wire DC bus and a second end connected to a charging interface of an electric vehicle.
3. The optical storage and charging system according to claim 2, wherein the connection manner of the charging DC/DC converter and the three-wire system DC bus includes:
the positive electrode and the negative electrode of the first end of the charging DC/DC converter are respectively connected with the direct current positive bus and the direct current negative bus; or (b)
The positive electrode and the negative electrode of the first end of the charging DC/DC converter are respectively connected with the direct current positive bus and the neutral point zero line; or (b)
And the positive electrode and the negative electrode of the first end of the charging DC/DC converter are respectively connected with the direct current negative electrode bus and the neutral point zero line.
4. The optical storage and retrieval system according to claim 1, further comprising a customer side junction box through which the ac side of the inverter is connected to the ac utility grid.
5. The optical storage and retrieval system according to claim 4, wherein said three-wire dc bus is interfaced with a dc micro-grid of said subscriber-side junction box.
6. The optical storage and retrieval system according to claim 5, further comprising a dc breaker, said three-wire dc bus being interfaced with said dc microgrid of said subscriber side junction box by said dc breaker.
7. The optical storage and charging system of claim 6, further comprising a dc leakage switch, wherein the three-wire dc bus is connected to the dc micro-grid interface of the subscriber side junction box sequentially through the dc circuit breaker and the dc leakage switch.
8. A light storage and charging system according to claim 1, wherein said photovoltaic DC/DC converter comprises a plurality of outputs, at least one of said photovoltaic DC/DC converter being connected to said direct current positive bus, said direct current negative bus and said midpoint neutral line, the remaining outputs of said photovoltaic DC/DC converter being connected to said direct current positive bus and said direct current negative bus.
9. The optical storage and charging system according to claim 1, wherein the energy storage DC/DC bidirectional converter comprises a plurality of energy storage DC/DC bidirectional converters, one end of at least one of the energy storage DC/DC bidirectional converters is connected to the direct current positive bus, the direct current negative bus and the midpoint neutral line, and the other end is connected to the corresponding energy storage battery;
and one end of the rest energy storage DC/DC bidirectional converters is connected with the direct current positive bus and the direct current negative bus, and the other end of the rest energy storage DC/DC bidirectional converters is connected with the corresponding energy storage batteries.
10. The optical storage and charging system of claim 1, further comprising a ground bus connected to the photovoltaic DC/DC converter, the energy storage DC/DC bi-directional converter, and an electrical load, respectively.
11. A light harvesting system as recited in claim 10, further comprising a ground switch for controlling a state of communication between the ground bus and the midpoint neutral.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311278305.4A CN117293786A (en) | 2023-09-28 | 2023-09-28 | Light stores up fills system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311278305.4A CN117293786A (en) | 2023-09-28 | 2023-09-28 | Light stores up fills system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117595345A (en) * | 2024-01-17 | 2024-02-23 | 国网山西省电力公司运城供电公司 | A working implementation method and device of a light storage direct-flexible system |
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2023
- 2023-09-28 CN CN202311278305.4A patent/CN117293786A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117595345A (en) * | 2024-01-17 | 2024-02-23 | 国网山西省电力公司运城供电公司 | A working implementation method and device of a light storage direct-flexible system |
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