CN209860595U - Power supply system - Google Patents
Power supply system Download PDFInfo
- Publication number
- CN209860595U CN209860595U CN201822275994.4U CN201822275994U CN209860595U CN 209860595 U CN209860595 U CN 209860595U CN 201822275994 U CN201822275994 U CN 201822275994U CN 209860595 U CN209860595 U CN 209860595U
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- electrically connected
- direct current
- generation unit
- power generation
- load
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- 238000010248 power generation Methods 0.000 claims abstract description 58
- 238000004146 energy storage Methods 0.000 claims abstract description 17
- 238000012544 monitoring process Methods 0.000 claims description 5
- 239000002699 waste material Substances 0.000 abstract description 5
- 230000005611 electricity Effects 0.000 description 14
- 230000009977 dual effect Effects 0.000 description 7
- KTSFMFGEAAANTF-UHFFFAOYSA-N [Cu].[Se].[Se].[In] Chemical compound [Cu].[Se].[Se].[In] KTSFMFGEAAANTF-UHFFFAOYSA-N 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B10/00—Integration of renewable energy sources in buildings
- Y02B10/10—Photovoltaic [PV]
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B10/00—Integration of renewable energy sources in buildings
- Y02B10/70—Hybrid systems, e.g. uninterruptible or back-up power supplies integrating renewable energies
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
Abstract
The present application provides a power supply system. The power supply system includes: the first power generation unit is a photovoltaic power generation unit and comprises a photovoltaic panel; the direct current bus is directly and electrically connected with the first power generation unit; the energy storage unit is directly and electrically connected with the direct current bus; the local load unit comprises a local load, the local load unit is electrically connected with the direct current bus, the local load is a load in and/or on a local building, and the local building is a building on which the photovoltaic panel is installed; a second power generation unit providing direct current; and the remote load unit comprises a double-power-supply switching device and a remote load, wherein the double-power-supply switching device is respectively in disconnectable electric connection with the second power generation unit and the direct current bus, and is also in electric connection with the remote load, and the remote load is a direct current load. The system avoids electric quantity waste caused by the fact that the local load cannot consume the generated electric quantity of the photovoltaic power generation unit in time, and avoids electric energy loss caused by the fact that direct current is converted into alternating current.
Description
Technical Field
The present application relates to the electrical field, and in particular, to a power supply system.
Background
In the prior art, after the photovoltaic system generates power, the energy is stored through the output of the controller and is inverted to be supplied to a load for use, generally speaking, the photovoltaic capacity of the photovoltaic system is far larger than the load capacity, so a large-capacity energy storage battery pack can be arranged in the photovoltaic system, and if the load power consumption is reduced, the electric energy of the photovoltaic system cannot be timely digested, so that a large amount of electric energy is wasted.
Therefore, there is a need for a system that can alleviate the problem of power waste caused by too little power usage at the load.
SUMMERY OF THE UTILITY MODEL
The main objective of the present application is to provide a power supply system including a photovoltaic module, so as to solve the problem of power loss caused by the power supply system including the photovoltaic module in the ac power supply mode in the prior art.
In order to achieve the above object, according to one aspect of the present application, there is provided a power supply system including: a first power generation unit that is a photovoltaic power generation unit including at least one photovoltaic panel; a DC bus directly electrically connected to the first power generation unit; the energy storage unit is directly and electrically connected with the direct current bus; a local load unit comprising a plurality of local loads, the local load unit being electrically connected to the dc bus, the local loads being loads in and/or on a local building, the local building being a building in which the photovoltaic panel is installed; a second power generation unit providing direct current; the remote load unit comprises a dual-power-supply switching device and a plurality of remote loads, one end of the dual-power-supply switching device is electrically connected with the direct current bus in a disconnectable manner, the other end of the dual-power-supply switching device is electrically connected with the remote loads respectively, the dual-power-supply switching device is further electrically connected with the second power generation unit in a disconnectable manner, and the remote loads are direct current loads.
Further, the power supply system further includes: and one end of the rectifier is electrically connected with the commercial power, and the other end of the rectifier is electrically connected with the direct current bus.
Further, the first power generation unit includes: a photovoltaic module comprising a plurality of said photovoltaic panels; and one end of the MPPT controller is electrically connected with the photovoltaic module, and the other end of the MPPT controller is directly and electrically connected with the direct current bus.
Further, the energy storage unit includes: one end of the DC/DC converter is directly and electrically connected with the direct current bus; and the storage battery pack is electrically connected with the other end of the DC/DC converter.
Furthermore, a monitoring module is electrically connected between the DC/DC converter and the storage battery pack and used for monitoring the state of the storage battery pack.
Further, the direct current bus is a 48V direct current bus.
Furthermore, each local load is a dc load, the local load unit further includes a dc protection circuit, one end of the dc protection circuit is directly electrically connected to the dc bus, and the other end of the dc protection circuit is electrically connected to the local load.
Furthermore, the direct current loads comprise a computer, a television and a refrigerator.
Further, the second power generation unit is a photovoltaic power generation unit.
Furthermore, each photovoltaic panel is a copper indium gallium selenide photovoltaic panel.
By applying the technical scheme of the application, in the power supply system, electricity sent by the photovoltaic power generation unit can be directly supplied to the local load through the direct current bus, and part of electric quantity which cannot be consumed by the local load is supplied to the far-end direct current load in the system, so that the problem that the local load in the prior art cannot timely consume the electric quantity obtained by the photovoltaic power generation unit is avoided, and the waste of the electric quantity is avoided. In addition, in the power supply system, the electricity generated by the photovoltaic power generation unit is directly supplied to the local load and the remote load through the direct current bus, the electricity generated by the photovoltaic power generation unit is not firstly converted into alternating current, and the electric energy loss caused by the fact that the direct current is converted into the alternating current is avoided.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application. In the drawings:
fig. 1 shows a block diagram of an embodiment of a power supply system according to the present application.
Wherein the figures include the following reference numerals:
10. a photovoltaic power generation unit; 20. a rectifier; 30. commercial power; 40. a direct current bus; 50. an energy storage unit; 60. a local load unit; 70. a remote load unit; 11. a photovoltaic module; 12. an MPPT controller; 51. a DC/DC converter; 52. a battery pack; 61. a DC protection circuit; 62. a local load; 71. a dual power switching device; 72. a remote load; 80. a second power generation unit.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
As described in the background art, in the prior art, a power supply system including a photovoltaic module is provided with power in an ac power supply mode, which causes a loss of electric energy, and in order to solve the above problem, the present application provides a power supply system including a photovoltaic module.
In an exemplary embodiment of the present application, there is provided a power supply system including a photovoltaic module, as shown in fig. 1, the power generation system including:
a first power generation unit which is a photovoltaic power generation unit 10 and includes at least one photovoltaic panel;
a dc bus 40 electrically connected directly to the first power generation unit;
an energy storage unit 50 electrically connected directly to the dc bus 40;
a local load unit 60 including a plurality of local loads 62, the local load unit 60 being electrically connected to the dc bus 40, the local loads 62 being loads in and/or on a local building, the local building being a building in which the photovoltaic panel is installed;
a second power generation unit 80 that supplies direct current;
the remote load unit 70 includes a dual power source switching device 71 and a plurality of remote loads 72, one end of the dual power source switching device 71 is disconnectably electrically connected to the dc bus 40, the other end is electrically connected to the plurality of remote loads 72, the dual power source switching device 71 is also disconnectably electrically connected to a second power generation unit, and the remote loads 72 are dc loads. The dual power supply switching device 71 functions as a switch, when the photovoltaic power generation unit 10 cannot supply power to a remote load, the dual power supply switching device 71 can be disconnected from the dc bus 40 and connected to the second power generation unit 80, and when the photovoltaic power generation unit 10 can supply power to the remote load, the dual power supply switching device 71 can be disconnected from the second power generation unit 80 and connected to the dc bus 40.
In the power supply system, the electricity generated by the photovoltaic power generation unit 10 can be directly supplied to the local load through the dc bus 40, and part of the electricity which cannot be consumed by the local load is supplied to the remote dc load in the system, so that the problem that the local load in the prior art cannot timely consume the electricity obtained by the photovoltaic power generation unit 10 is avoided, and the waste of the electricity is avoided. In addition, in the power supply system, the electricity generated by the photovoltaic power generation unit 10 is directly supplied to the local load 62 and the remote load 72 through the direct current bus 40, rather than being firstly converted into alternating current, so that the loss of electric energy caused by the conversion of the direct current into the alternating current is avoided.
In the present application, "directly electrically connected" means that the two are directly connected without other structures or units in between.
In practical applications, if the weather is rainy and the electric energy stored in the energy storage unit 50 is exhausted, in order to supply power to the load normally, in an embodiment of the present application, as shown in fig. 1, the power supply system further includes a rectifier 20, one end of the rectifier 20 is electrically connected to the utility power 30, and the other end of the rectifier 20 is electrically connected to the dc bus 40.
In order to better distribute the amount of electricity generated by the photovoltaic module 11, i.e. to better distribute the amount of electricity supplied to the load and the amount of electricity stored in the energy storage unit 50, in an embodiment of the present application, as shown in fig. 1, the photovoltaic power generation unit 10 includes the photovoltaic module 11 and the MPPT controller 12, and the photovoltaic module 11 includes a plurality of photovoltaic panels; one end of the MPPT controller 12 is electrically connected to the photovoltaic module 11, and the other end is directly electrically connected to the dc bus 40.
In one embodiment of the present application, as shown in fig. 1, the energy storage unit includes a DC/DC converter 51 and a battery pack 52, and one end of the DC/DC converter 51 is directly electrically connected to the DC bus 40; battery pack 52 is electrically connected to the other end of DC/DC converter 51. The DC/DC converter 51 protects the branch where the energy storage unit 50 is located, and specifically includes functions of current protection, voltage protection, ground leakage current protection, overload thermal protection, and the like. The energy storage system is used for balancing photovoltaic power generation and load fluctuation, namely when the photovoltaic cannot generate power due to factors such as weather or the number of the loads changes, the energy storage system can ensure that the power supply of the photovoltaic power supply system is more stable.
In order to maintain the energy storage unit and improve the reliability of the energy storage unit, in an embodiment not shown in the figure of the present application, a monitoring module is further electrically connected between the DC/DC converter and the storage battery pack, and the monitoring module is configured to monitor a state of the storage battery pack, so that the energy storage system always operates in an optimal state.
In another embodiment of the present application, the local load 62 is a dc load, and as shown in fig. 1, the local load unit 60 further includes a dc protection circuit 61, wherein one end of the dc protection circuit 61 is directly electrically connected to the dc bus 40, and the other end is electrically connected to the local load 62. The dc protection circuit 61 has the functions of voltage stabilization, current limiting protection, short circuit protection, and converter overheat protection. Further ensuring stable and safe power supply to the load.
The photovoltaic panel in this application can be any photovoltaic panel among the prior art, and the suitable photovoltaic panel of technical staff in this field can select according to actual conditions to supply power for the load, and in an embodiment of this application, above-mentioned photovoltaic panel is the copper indium gallium selenide board, and this photovoltaic panel has advantages such as photoelectric conversion efficiency is higher and be suitable for building photovoltaic field.
In a specific embodiment of the present application, the dc bus voltage is transmitted at a high voltage, so that the line loss is reduced, and the power supply efficiency is improved.
The voltage of the dc bus can be selected to have a suitable voltage, and those skilled in the art can select a suitable voltage according to actual conditions. For example, a 24V, 48V, 220V, or the like dc bus may be selected.
In a specific embodiment of the present application, the dc bus is a 48V dc bus, that is, the voltage of the dc bus is 48V.
The load of the present application may be any load in the prior art, and a person skilled in the art may select and appropriately supply the power generated by the power generation unit to any load according to actual situations. If some of the loads are rated at voltages greater than and/or less than 48V, then step-up and/or step-down devices are also needed in the local load units to step-up or step-down to meet the power requirements of the loads. The voltage levels of the booster and the step-down transformer are diversified, and can be set according to the standard of the voltage for the load.
The second power generation unit of the present application is a power generation unit capable of providing direct current in the prior art, and in a specific embodiment of the present application, the second power generation unit is a photovoltaic power generation unit.
The second photovoltaic power generation unit can be any photovoltaic power generation unit in the prior art, and a person skilled in the art can select a suitable photovoltaic panel to form a photovoltaic power generation unit to supply power to a load according to actual conditions. The second photovoltaic power generation unit may be the same in composition as the first power generation unit, i.e., include a photovoltaic module and an MPPT controller.
In another embodiment of the present application, the power supply system further includes an energy management unit, and the energy management unit can reasonably distribute energy to the two photovoltaic power generation units, so that power supply reliability is improved, and cost is reduced.
From the above description, it can be seen that the above-described embodiments of the present application achieve the following technical effects:
in the power supply system of the application, electricity sent by the photovoltaic power generation unit can be directly supplied to the local load through the direct current bus 40, and part of electric quantity which cannot be consumed by the local load is supplied to the far-end direct current load, so that the problem that the local load in the prior art cannot timely consume the electric quantity obtained by the photovoltaic power generation unit is avoided, and the waste of the electric quantity is avoided. In addition, in the power supply system, the electricity generated by the photovoltaic power generation unit is directly supplied to the local load and the remote load through the direct current bus, the electricity generated by the photovoltaic power generation unit is not firstly converted into alternating current, and the electric energy loss caused by the fact that the direct current is converted into the alternating current is avoided.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (10)
1. A power supply system, characterized in that the power supply system comprises:
a first power generation unit that is a photovoltaic power generation unit including at least one photovoltaic panel;
a DC bus directly electrically connected to the first power generation unit;
the energy storage unit is directly and electrically connected with the direct current bus;
a local load unit comprising a plurality of local loads, the local load unit being electrically connected to the dc bus, the local loads being loads in and/or on a local building, the local building being a building in which the photovoltaic panel is installed;
a second power generation unit providing direct current;
the remote load unit comprises a dual-power-supply switching device and a plurality of remote loads, one end of the dual-power-supply switching device is electrically connected with the direct current bus in a disconnectable manner, the other end of the dual-power-supply switching device is electrically connected with the remote loads respectively, the dual-power-supply switching device is further electrically connected with the second power generation unit in a disconnectable manner, and the remote loads are direct current loads.
2. The power supply system of claim 1, further comprising:
and one end of the rectifier is electrically connected with the commercial power, and the other end of the rectifier is electrically connected with the direct current bus.
3. The power supply system of claim 1, wherein the first power generation unit comprises:
a photovoltaic module comprising a plurality of said photovoltaic panels;
and one end of the MPPT controller is electrically connected with the photovoltaic module, and the other end of the MPPT controller is directly and electrically connected with the direct current bus.
4. The power supply system of claim 1, wherein the energy storage unit comprises:
one end of the DC/DC converter is directly and electrically connected with the direct current bus;
and the storage battery pack is electrically connected with the other end of the DC/DC converter.
5. The power supply system of claim 4, wherein a monitoring module is electrically connected between the DC/DC converter and the battery pack, and is configured to monitor a status of the battery pack.
6. The power supply system according to any one of claims 1 to 5, wherein the DC bus is a 48V DC bus.
7. The power supply system according to any one of claims 1 to 5, wherein each of the local loads is a direct current load, and the local load unit further includes a direct current protection circuit having one end electrically connected to the direct current bus directly and the other end electrically connected to the local load.
8. The power supply system of claim 7, wherein said plurality of DC loads comprise computers, televisions and refrigerators.
9. The power supply system according to any one of claims 1 to 5, wherein the second power generation unit is a photovoltaic power generation unit.
10. A power supply system according to any one of claims 1 to 5 wherein each photovoltaic panel is a CIGS photovoltaic panel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822275994.4U CN209860595U (en) | 2018-12-30 | 2018-12-30 | Power supply system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822275994.4U CN209860595U (en) | 2018-12-30 | 2018-12-30 | Power supply system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209860595U true CN209860595U (en) | 2019-12-27 |
Family
ID=68929764
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201822275994.4U Active CN209860595U (en) | 2018-12-30 | 2018-12-30 | Power supply system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209860595U (en) |
-
2018
- 2018-12-30 CN CN201822275994.4U patent/CN209860595U/en active Active
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