CN110718937A - Photovoltaic energy storage power distribution control method and system for smart home - Google Patents
Photovoltaic energy storage power distribution control method and system for smart homeDownload PDFInfo
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- CN110718937A CN110718937ACN201911093152.XACN201911093152ACN110718937ACN 110718937 ACN110718937 ACN 110718937ACN 201911093152 ACN201911093152 ACN 201911093152ACN 110718937 ACN110718937 ACN 110718937A
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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
- H02J3/28—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
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- 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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
- 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
- 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
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
- 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
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
Description
Technical Field
The invention relates to the technical field of photovoltaic power generation, in particular to a photovoltaic energy storage power distribution control method and system for an intelligent household.
Background
With the development and progress of the photovoltaic industry, household power distribution systems combining photovoltaic and energy storage are applied more and more. The inverter is necessary equipment in the photovoltaic power generation technology, and at present, most inverters on the market only work in two independent working modes of grid connection or grid disconnection, so that certain limitation exists. The grid-connected connection mode needs to be connected with a power grid, an island effect can be generated when the power grid is powered off, and electric energy generated by photovoltaic is transmitted to a public power grid through an inverter and is generally used in countries and regions with strong power grids and stable power supply, such as China; the off-grid connection mode mainly aims at areas without electricity, load electricity is only provided by photovoltaic, so that the capacity of the load is limited by the capacity of equipment, and when medium and large-sized electrical equipment with high starting power such as an induction cooker, a central air conditioner and the like is planned to be used, the capacity of an off-grid inverter needs to be simply increased by multiple times, so that the off-grid connection mode is low in economic value and high in cost, and is difficult to effectively popularize. The existing off-grid and grid-connected integrated inverter is also provided, but the off-grid power is low, and the power grid is also required to be subjected to island protection when the power grid is cut off, so that the cost of equipment is greatly increased.
Disclosure of Invention
The invention aims to provide a photovoltaic energy storage and distribution control method and system for an intelligent user, wherein the photovoltaic energy storage and distribution control method and system are used by an off-grid inverter in a grid-connected mode, and both photovoltaic and a power grid can supply power for a common power supply line.
In order to achieve the purpose, the invention provides a photovoltaic energy storage power distribution control method for an intelligent user, wherein a detection control module is arranged in a power distribution system and used for detecting the power supply condition and the load capacity of a power grid;
the detection control module detects the load capacity, if the load capacity is smaller than the capacity set by the off-grid inverter, a common power supply line supplies power to the load, and the common power supply line supplies power to the photovoltaic power grid and the power grid; if the load capacity is larger than the capacity set by the off-grid inverter, the standby power supply line supplies power to the load, and the standby power supply line supplies power to the power grid;
the detection control module detects the power supply condition of the power grid, and if the power grid is powered off, a common power supply line supplies power to a load; and if the power supply of the power grid is normal, controlling through the detection result of the load capacity.
Preferably, the common power supply line and the standby power supply line are switched by an automatic switching device.
Preferably, when the common power supply line works, the load is supplied with power by the photovoltaic, and when the photovoltaic is insufficient, the load is supplied with power by the power grid and the photovoltaic together.
Preferably, when the power grid is powered off, the load is powered by the photovoltaic device, and if the photovoltaic device is insufficient to supply electricity to the load, the load is powered by the storage battery.
Preferably, the storage battery is charged by the photovoltaic system, and if the photovoltaic system is not enough to fully charge the storage battery, the storage battery is charged by the power grid.
The invention also provides a photovoltaic energy storage power distribution system for the intelligent household, which comprises a photovoltaic cell panel, an off-grid inverter, an automatic switching device and a detection control module;
the output end of the photovoltaic cell panel is connected with the first input end of the off-grid inverter, and the second input end of the off-grid inverter is connected with the power grid;
the output end of the off-grid inverter is connected with the first input end of the automatic switching device, the second input end of the automatic switching device is connected with a power grid, and the output end of the automatic switching device is connected with a load;
the detection control module is connected with the automatic switching device and comprises a first detection point and a second detection point, the first detection point is connected with a load, and the second detection point is connected with a power grid.
Preferably, the system further comprises a storage battery, and a charge and discharge port of the storage battery is connected with the off-grid inverter.
Preferably, still include grid circuit breaker and load circuit breaker, the second input of off-grid inverter with automatic switching device's second input passes through grid circuit breaker is connected with the electric wire netting, automatic switching device's output passes through load circuit breaker is connected with the load.
Preferably, the photovoltaic grid-connected inverter further comprises a combiner box, wherein the combiner box is arranged between the photovoltaic cell panel and the first input end of the off-grid inverter.
Preferably, a lightning protection module is arranged in the header box.
According to the photovoltaic energy storage power distribution control method and system for the smart home, the change of the load capacity can be monitored in real time through the detection control module, and then the automatic switching device is controlled to switch the power supply line between the common power supply line and the standby power supply line; the grid-connected use of the off-grid inverter can enable the power grid and the photovoltaic to be used as common power supply lines together to supply power to the load, so that the frequency of switching from the power supply of the photovoltaic cell panel to the power supply of the power grid is reduced; the storage battery can store energy according to the electric quantity generated by the photovoltaic panel and the electric quantity of a power grid, and supplies power to a load under the conditions of power failure and incapability of photovoltaic power generation; the power grid circuit breaker and the load circuit breaker can cut off a circuit in time under some conditions, so that the electricity utilization safety is guaranteed; the combiner box can meet the requirement of arranging a plurality of photovoltaic cell panels, so that the photovoltaic power generation capacity is increased, and the electric quantity of a power grid is reduced; the lightning protection module can protect the lightning electromagnetic pulse, protect the circuit better, and enable the power distribution system to be normally used in areas with more thunderstorm weather.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a first schematic flow chart of a control method of the present invention;
FIG. 2 is a second flow chart of the control method of the present invention;
fig. 3 is a schematic diagram of an implementation structure of the power distribution system of the present invention.
The reference numbers illustrate:
1-photovoltaic cell panel, 2-off-grid inverter, 3-automatic switching device, 4-detection control module, 41-first detection point, 42-second detection point, 5-storage battery, 6-power grid breaker, 7-load breaker, 8-combiner box, 9-power grid, 10-load.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that, if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative positional relationship between the components, the movement situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.
In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
The invention discloses a photovoltaic energy storage power distribution control method for smart users, as shown in figures 1 to 3, a detection control module 4 is arranged in a power distribution system and is used for detecting the power supply condition and the load capacity of a power grid 9;
the detection control module 4 detects the load capacity, if the load capacity is smaller than the capacity of the off-grid inverter 2, a common power supply line supplies power to a load 10, and the common power supply line supplies power to a photovoltaic power grid and a power grid 9; if the load capacity is larger than the capacity of the off-grid inverter 2, the standby power supply line supplies power to the load 10, and the standby power supply line supplies power to the power grid 9;
the detection control module 4 detects the power supply condition of the power grid 9, and if the power grid 9 is powered off, a common power supply line supplies power to the load 10; and if the power supply of the power grid 9 is normal, controlling through the detection result of the load capacity.
Photovoltaic energy storage distribution system will generally set up by two power supply lines: the photovoltaic power generation system comprises a common power supply line and a standby power supply line, wherein the photovoltaic power generation is the common power supply line, the power grid is the standby power supply line, when the photovoltaic power generation is not enough to provide a load 10 for use, the power grid is switched to supply power when the photovoltaic power generation is in work, and the photovoltaic power supply is switched to the power grid if the power grid is powered off. According to the technical scheme, the detection control module 4 is arranged in the photovoltaic energy storage power distribution system and used for detecting the power supply condition and the load capacity of the power grid 9, so that a common power supply line and a standby power supply line can be controlled and switched better. When the photovoltaic power generation system works normally, the load capacity is smaller than the capacity of the off-grid inverter 2, the photovoltaic power generation supplies power to the load 10, and when the photovoltaic power generation is not enough to provide electricity for the load 10, the power grid 9 and the photovoltaic power supply the load 10 together, and at the moment, the power grid and the photovoltaic power supply are kept as a common power supply line. When the detection control module 4 detects that the load capacity is larger than the capacity of the off-grid inverter 2, in order to protect the off-grid inverter 2, the power supply line is switched to a standby power supply line, and the power grid 9 supplies power to the load 10. The off-grid inverter 2 is used for grid connection, so that the photovoltaic and the power grid 9 can be used as a common power supply line to supply power to the load 10, solar energy can be utilized to the maximum extent, the common power supply line can be guaranteed to supply enough electric quantity to the load 10, and the power supply line is prevented from being frequently switched between the common power supply line and a standby power supply line.
When the power grid 9 is powered off, the standby power supply line cannot supply power to the load 10, so that the standby power supply line can only be switched to a common power supply line, the load 10 is supplied with power through the photovoltaic, and even if the power grid is powered off, the load 10 can be guaranteed to be supplied with power to a certain extent.
Further, when the common power supply line works, the load 10 is supplied with power by the photovoltaic, and when the photovoltaic is insufficient, the load 10 is supplied with power by the power grid 9 and the photovoltaic together. The switching of the power supply of the load 10 between the normal power supply line and the standby power supply line is realized by an automatic switching device arranged in the power distribution system, and the automatic switching device receives the instruction of the detection control module 4 to switch the power supply lines.
Further, when the common power supply line works, the load 10 is supplied with power by the photovoltaic, and when the photovoltaic is insufficient, the load 10 is supplied with power by the power grid 9 and the photovoltaic together. The photovoltaic power supply firstly supplies power to a load 10, solar energy is utilized as much as possible, and the electric quantity of a power grid is saved; when the photovoltaic power supply is not enough to be used for the load 10, the photovoltaic power supply and the power grid 9 are used for supplying power for the load 10, the power grid 9 is not needed to be replaced for supplying power, the electric quantity of the upper photovoltaic power supply can be used, and therefore the electric quantity of the power grid 9 is reduced, and energy is saved.
Further, when the power grid 9 is powered off, the load is supplied by the photovoltaic, and if the photovoltaic is not enough to supply power to the load 10, the load 10 is supplied by the storage battery. If power is cut off at night, the power grid 9 and the photovoltaic can not provide electric quantity, at the moment, a standby power supply, namely a storage battery, needs to be started, a certain amount of electric quantity is stored through the storage battery, and the situation that the load 10 can not obtain the electric quantity at all when power is cut off at night is avoided.
Further, the storage battery is powered by the photovoltaic, and if the photovoltaic is not enough to fully charge the storage battery, the storage battery is charged by the power grid 9. When sunshine is abundant in daytime, the power consumption of the load 10 is generally less, photovoltaic power generation can not only be used by the load 10, but also can store redundant electric quantity into the storage battery, if the photovoltaic cannot store the storage battery fully, the storage battery is continuously charged by the power grid 9 to ensure that the storage battery is fully charged, and when power is off at night, the storage battery has enough electricity to be provided for the load 10 to use.
The invention also discloses a photovoltaic energy storage power distribution system for an intelligent user, which comprises a photovoltaic cell panel 1, an off-grid inverter 2, an automatic switching device 3 and a detection control module 4, wherein the photovoltaic cell panel is connected with the off-grid inverter 2;
the output end of the photovoltaic cell panel 1 is connected with the first input end of the off-grid inverter 2, and the second input end of the off-grid inverter 2 is connected with the power grid 9;
the output end of the off-grid inverter 2 is connected with the first input end of the automatic switching device 3, the second input end of the automatic switching device 3 is connected with a power grid 9, and the output end of the automatic switching device 3 is connected with a load 10;
the detection control module 4 is connected to the automatic switching device 3, and the detection control module 4 includes a first detection point 41 and a second detection point 42, the first detection point 41 is connected to the load 10, and the second detection point 42 is connected to the power grid 9.
The output end of the off-grid inverter 2 is connected with the first input end of the automatic switching device 3, the output end of the automatic switching device 3 is connected with a load 10, and the power supply line is a common power supply line of the load 10. The photovoltaic cell panel 1 converts solar radiation energy into direct current electric energy through a photoelectric effect or a photochemical effect by absorbing sunlight, and then converts the direct current into alternating current through the off-grid inverter 2, and further transmits the alternating current to the load 10. Meanwhile, the second input end of the off-grid inverter 2 is connected with the power grid 9, when the load 10 uses a common power supply line, if the electric energy provided by the photovoltaic cell panel 1 is not enough for the load 10 to use, the electric energy provided by the power grid 9 can supply power to the load 10 through the off-grid inverter 2 and the automatic switching device 3, and at this time, the power supply line of the load 10 is still the common power supply line. The electric energy provided by the photovoltaic cell panel 1 is firstly supplied to a load 10 for use, so that the electric energy of a power grid 9 can be greatly saved; meanwhile, when the electric energy of the power grid 9 is insufficient, the power grid supplies power to the load 10 through a common power supply line, so that the frequency of switching from the power supply of the photovoltaic cell panel 1 to the power supply of the power grid 9 is reduced. The system is more suitable for middle and laggard countries and regions which have power grids but are unstable in power supply and frequently have power failure, and under the condition, the system can realize the common power supply of the photovoltaic and the power grids of the common power supply line so as to ensure that the photovoltaic power supply can be preferentially used when the load capacity is large, thereby saving energy; and when the power grid 9 is powered off, the photovoltaic power supply is still used.
The second input end of the automatic switching device 3 is connected with the power grid 9, the output end of the automatic switching device 3 is connected with the load 10, and the power supply line is a standby power supply line of the load 10. After the common power supply line and the standby power supply line pass through the automatic switching device 3, the output ends of the common power supply line and the standby power supply line are connected in parallel, and then are connected with the load 10 to supply power to the load 10. When the capacity of the load 10 exceeds the capacity of the off-grid inverter 2, the automatic switching device 3 switches the power supply of the load 10 from a common power supply line to a standby power supply line, and the power supply is directly supplied by the power grid 9.
The detection control module 4 is used for automatically detecting the capacity change of the load 10 and detecting the power supply condition of the power grid 9, and further controlling the automatic switching device 3 to switch between a common power supply line and a standby power supply line. The detection control module 4 may be configured to perform timing detection, for example, set once every 30 minutes, and when the first detection point 41 of the detection control module 4 detects that the capacity of the load 10 is greater than the capacity of the inverter, control the automatic switching device 3 to switch the power supply line from the normal power supply line to the standby power supply line, so that the power grid 9 supplies power to the load 10. After 30 minutes, the first detection point 41 detects the capacity of the load 10 again, and if the detection result is: if the capacity of the load 10 is smaller than that of the off-grid inverter 2, controlling the automatic switching device 3 to switch the power supply line from a standby power supply line to a common power supply line; if the detection result is: and if the capacity of the load 10 is larger than that of the off-grid inverter 2, the power supply line is not switched. Of course, when the power supply line is a normal power supply line, the first detection point 41 detects the capacity of the load 10 in real time, so as to switch to the standby circuit in time.
On the other hand, the second detection point 42 of the detection control module 4 mainly detects whether the power supply of the power grid 9 is normal, and when the power grid 9 fails, if the power supply line at the time is a standby power supply line, the automatic switching device 3 is controlled to switch the power supply line to a common power supply line, so as to ensure that the power supply of the load 10 can still be provided during the power failure. In the area where the power supply of the power grid 9 is unstable, the technical scheme can effectively solve the problem that the household appliance cannot be normally used when power is cut off; the use of the grid 9 power can also be reduced. In some cases, a user may install a generator, and the generator may be started to supply power to the load 10 after power failure, but the noise generated when the generator operates is large, which may affect the user, especially at night, and may affect the rest of the user.
Further, still include battery 5, the charge and discharge port of battery 5 is connected with off-grid inverter 2.
The accumulator 5 is mainly used to store electric energy in order to energize the load 10 in an emergency. The electric energy source of the storage battery 5 is firstly the electric energy generated by the photovoltaic cell panel 1 absorbing solar power, and secondly the electric energy of the power grid 9 is input from the second input end of the off-grid inverter 2 and is stored in the storage battery 5 through the off-grid inverter 2. Set up battery 5 can store a certain amount of electric energy, in the outage of electric wire netting 9 during the unable electricity generation of photovoltaic cell board 1, battery 5 can supply power for load 10, guarantees that load 10 can normally use electricity in certain time. In the daytime, in general, household electricity is less, and at the moment, sunlight is sufficient, electricity generated by the photovoltaic cell panel 1 can be provided for a load 10, and redundant electric energy can be stored in the storage battery 5, so that the electric energy of the power grid 9 can be reduced; when the storage battery 5 cannot be fully charged by the electric energy generated by the photovoltaic cell panel 1, the power grid 9 is used for charging the storage battery 5, so that the electric quantity of the storage battery 5 is full, when power failure occurs at night, neither photovoltaic power generation nor power supply of the power grid 9 is realized, and the storage battery 5 fully loaded at the moment can provide enough electric quantity for the load 10, so that normal power utilization of a user is guaranteed.
Further, still include grid circuit breaker 6 and load circuit breaker 7, the second input of off-grid inverter 2 with the second input of automatic switching device 3 passes through grid circuit breaker 6 is connected with electric wire netting 9, the output of automatic switching device 3 passes through load circuit breaker 7 is connected with load 10. The power grid circuit breaker 6 and the load circuit breaker 7 can timely cut off a circuit in some emergencies, and the electricity utilization safety is guaranteed.
Further, still include collection flow box 8, collection flow box 8 set up in photovoltaic cell board 1 with from net inverter 2 first input between. In some cases, a plurality of photovoltaic panels 1 may be disposed, and then connected in series to form a plurality of photovoltaic strings, and then a plurality of photovoltaic strings are connected in parallel to the combiner box 8, and after being combined by the combiner box 8, the combined photovoltaic strings are input into the off-grid inverter 2. Set up collection flow box 8 can conveniently increase photovoltaic cell panel 1's quantity makes photovoltaic generated energy bigger to more can reduce the electric quantity that uses electric wire netting 9.
Further, a lightning protection module is arranged in the header box 8. The lightning protection module 10 is a power supply lightning protection device, and is arranged in some areas with more thunderstorm weather, so that a circuit can be better protected. The lightning rod is arranged outdoors in a more common lightning protection mode, so the lightning rod can be arranged in the technical scheme, and in addition, more importantly, the lightning electromagnetic pulse is protected, and the damage to the line and the load 10 equipment caused by the lightning electromagnetic pulse is avoided. Preferably, an anti-reverse function module can be further arranged in the junction box 8, and the anti-reverse function module is used for preventing the storage battery 5 or the power grid 9 from reversely transmitting power to the photovoltaic module, so that damage to the photovoltaic module is avoided.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A photovoltaic energy storage power distribution control method for smart users is characterized by comprising the following steps:
a detection control module is arranged in a power distribution system and used for detecting the power supply condition and the load capacity of a power grid;
the detection control module detects the load capacity, if the load capacity is smaller than the capacity set by the off-grid inverter, a common power supply line supplies power to the load, and the common power supply line supplies power to the photovoltaic power grid and the power grid; if the load capacity is larger than the capacity set by the off-grid inverter, the standby power supply line supplies power to the load, and the standby power supply line supplies power to the power grid;
the detection control module detects the power supply condition of the power grid, and if the power grid is powered off, a common power supply line supplies power to a load; and if the power supply of the power grid is normal, controlling through the detection result of the load capacity.
2. The photovoltaic energy storage and distribution control method for the smart user according to claim 1, characterized in that: the common power supply line and the standby power supply line are switched by an automatic switching device.
3. The photovoltaic energy storage and distribution control method for the smart user according to claim 1, characterized in that: when the common power supply line works, the load is supplied with power by the photovoltaic, and when the photovoltaic is insufficient, the load is supplied with power by the power grid and the photovoltaic together.
4. The photovoltaic energy storage and distribution control method for the smart user according to claim 1, characterized in that: when the power grid is powered off, the load is powered by the photovoltaic, and if the photovoltaic is not enough to supply electricity to the load, the load is powered by the storage battery.
5. The intelligent household photovoltaic energy storage and distribution control method according to claim 3, characterized in that: the storage battery is charged by the photovoltaic, and if the photovoltaic is not enough to fully charge the storage battery, the storage battery is charged by the power grid.
6. The utility model provides a photovoltaic energy storage distribution system is used at intelligence family which characterized in that: the off-grid photovoltaic power generation system comprises a photovoltaic cell panel, an off-grid inverter, an automatic switching device and a detection control module;
the output end of the photovoltaic cell panel is connected with the first input end of the off-grid inverter, and the second input end of the off-grid inverter is connected with the power grid;
the output end of the off-grid inverter is connected with the first input end of the automatic switching device, the second input end of the automatic switching device is connected with a power grid, and the output end of the automatic switching device is connected with a load;
the detection control module is connected with the automatic switching device and comprises a first detection point and a second detection point, the first detection point is connected with a load, and the second detection point is connected with a power grid.
7. The photovoltaic energy storage and distribution system for smart users according to claim 6, wherein: the charging and discharging port of the storage battery is connected with the off-grid inverter.
8. The photovoltaic energy storage and distribution system for smart users according to claim 6, wherein: still include grid circuit breaker and load circuit breaker, the second input of off-grid inverter with automatic switching device's second input passes through grid circuit breaker is connected with the electric wire netting, automatic switching device's output passes through load circuit breaker is connected with the load.
9. The photovoltaic energy storage and distribution system for smart users according to claim 6, wherein: still include the collection flow box, the collection flow box set up in photovoltaic cell board with between the first input of off-grid inverter.
10. The photovoltaic energy storage and distribution system for smart users according to claim 9, wherein: and a lightning protection module is arranged in the header box.
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