CN116742704A - Intelligent household energy storage system and implementation method thereof - Google Patents
Intelligent household energy storage system and implementation method thereof Download PDFInfo
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- CN116742704A CN116742704A CN202310710210.9A CN202310710210A CN116742704A CN 116742704 A CN116742704 A CN 116742704A CN 202310710210 A CN202310710210 A CN 202310710210A CN 116742704 A CN116742704 A CN 116742704A
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- 238000004146 energy storage Methods 0.000 title claims abstract description 164
- 238000000034 method Methods 0.000 title claims abstract description 18
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims abstract description 144
- 229910052744 lithium Inorganic materials 0.000 claims abstract description 144
- 238000004891 communication Methods 0.000 claims abstract description 110
- 238000007600 charging Methods 0.000 claims abstract description 54
- 238000007599 discharging Methods 0.000 claims abstract description 34
- 230000005611 electricity Effects 0.000 claims description 13
- 238000005286 illumination Methods 0.000 claims description 9
- 230000008569 process Effects 0.000 claims description 7
- 238000012545 processing Methods 0.000 claims description 3
- 238000010248 power generation Methods 0.000 abstract description 9
- 230000001105 regulatory effect Effects 0.000 abstract description 7
- 238000010586 diagram Methods 0.000 description 10
- 230000001276 controlling effect Effects 0.000 description 9
- 238000012544 monitoring process Methods 0.000 description 4
- 230000006978 adaptation Effects 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 210000004027 cell Anatomy 0.000 description 1
- 210000003850 cellular structure Anatomy 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002699 waste material Substances 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
- 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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/466—Scheduling the operation of the generators, e.g. connecting or disconnecting generators to meet a given demand
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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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00302—Overcharge protection
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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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00306—Overdischarge protection
-
- 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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
-
- 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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
-
- 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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
- H02J7/35—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering with light sensitive cells
-
- 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
-
- 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
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses an intelligent household energy storage system, which comprises a photovoltaic panel, a lithium battery energy storage module, a micro inverter, a household load and a power grid, wherein the input end of the lithium battery energy storage module is connected with the output end of the photovoltaic panel; the invention also discloses an implementation method of the intelligent household energy storage system; according to the invention, the energy generated by the photovoltaic panel is controlled and regulated by the power management communication unit and the voltage control and regulation unit and then transmitted to the micro inverter and then transmitted to the household load or the power grid, so that the household power demand of various forms such as solar power generation, lithium battery charging and discharging energy storage functions, off-grid power consumption and the like can be met.
Description
Technical Field
The invention belongs to the technical field of new energy photovoltaic power generation and energy storage, and particularly relates to an intelligent household energy storage system and an implementation method thereof.
Background
The solar energy is clean new energy for solving the crisis of human energy, is inexhaustible, is available everywhere, can be used for near power supply, does not need long-distance transmission, can avoid the loss of a long-distance transmission line, does not generate any waste, has no pollution or noise, does not have adverse effect on the environment, is an ideal clean energy, and the solar photovoltaic power generation system is a power generation system for directly converting solar energy into electric energy by utilizing a solar cell, does not need cooling water in the photovoltaic power generation process, can generate power by only needing a solar cell component, and can basically realize unattended operation by the wide adoption of an automatic control technology, and has low maintenance cost.
However, the existing household distributed power generation system has high input cost in the early stage, cannot be used portably after being fixedly installed, and limits the further development of the household energy storage system, so that the household energy storage system which has the advantages of simple structure, convenience in installation, low cost and convenience in carrying is needed, and the household energy storage system is beneficial to people to more conveniently realize the utilization of solar energy.
Disclosure of Invention
The invention aims to provide an intelligent household energy storage system for solving the problems in the background technology. The intelligent household energy storage system provided by the invention has the characteristics of simple structure, light architecture, convenience in installation of each module and low use cost.
The invention further aims to provide an implementation method of the intelligent household energy storage system.
In order to achieve the above purpose, the present invention provides the following technical solutions: the intelligent household energy storage system comprises a photovoltaic panel, a lithium battery energy storage module, a micro inverter, a household load and a power grid, wherein the input end of the lithium battery energy storage module is connected with the output end of the photovoltaic panel, the output end of the lithium battery energy storage module is connected with the input end of the micro inverter, and the output end of the micro inverter is respectively connected with the power grid and the input end of the household load;
the lithium battery energy storage module comprises a voltage control adjusting unit, a power management communication unit and a lithium battery energy storage unit, wherein the input end of the voltage control adjusting unit is connected with the output end of the photovoltaic panel, the output end of the voltage control adjusting unit is connected with the input end of the power management communication unit, the output end of the power management communication unit is connected with the micro inverter, and the power management communication unit is further connected with the lithium battery energy storage unit.
In order to realize various functions such as charge and discharge, further, the power management communication unit comprises an MCU (micro control unit) for data processing, a CHG MOS (chemical vapor gate) tube for controlling charge on-off, a DSG MOS tube for controlling discharge on-off and a PV MOS tube for controlling voltage control and regulation unit input.
In order to connect with the mobile terminal APP, remote monitoring and operation are performed, so that a user can adjust the discharging mode by himself, and further, the power management communication unit further comprises a wireless communication module. The wireless communication module is an RS485 communication module.
In order to ensure that the input voltage is stabilized at a set value, and meanwhile, the lithium battery is prevented from being overcharged, a secondary protection effect is achieved, and further, the voltage control and regulation unit comprises an MPPT controller.
In the invention, the implementation method of the intelligent household energy storage system comprises the following steps:
(one), lithium battery energy storage module charging mode only: when the power management communication unit judges that the discharge power of the photovoltaic panel meets the charging requirement of the lithium battery energy storage unit, if the power management communication unit judges that the lithium battery energy storage unit is not fully charged at the moment and a household load or a power grid does not need to be discharged, a CHG MOS tube in the power management communication unit is started, the DSG MOS tube and the PV MOS tube are closed, a direct current power supply generated by the photovoltaic panel rises or drops the voltage to a charging voltage suitable for charging the lithium battery energy storage unit through the voltage control and regulation unit, the lithium battery energy storage unit is charged through the power management communication unit, and after the power management communication unit judges that the lithium battery energy storage unit is fully charged, the CHG MOS tube is closed, and the voltage control and regulation unit cuts off the charging of the lithium battery energy storage unit;
(II) discharging mode of the lithium battery energy storage module only: when the power management communication unit judges that the illumination intensity cannot enable the discharge power of the photovoltaic panel to meet the charging requirement of the lithium battery energy storage unit, if the power management communication unit judges that the lithium battery energy storage unit has electricity which can be discharged at the moment, the voltage control adjustment unit does not work, at the moment, a DSG MOS tube in the power management communication unit is started, a CHG MOS tube and a PV MOS tube are closed, the lithium battery energy storage unit directly transmits a direct-current power supply to the micro inverter through the power management communication unit and then supplies power to a household load or a power grid, and if the power management communication unit judges that the electricity of the lithium battery energy storage unit is insufficient to discharge at the moment, the DSG MOS tube is closed, and the discharging process is disconnected;
and (III), charging the lithium battery energy storage module by the photovoltaic panel and discharging the household load or the power grid by the photovoltaic panel in a simultaneous starting mode: when the power management communication unit judges that the illumination intensity enables the discharge power of the photovoltaic panel to meet the electric power for household loads, if the power management communication unit judges that the lithium battery energy storage unit is not fully charged at the moment, a DSG MOS tube in the power management communication unit is closed, a CHG MOS tube and a PV MOS tube are opened, a direct-current power supply generated by the photovoltaic panel rises or drops the voltage to a charging voltage suitable for charging the lithium battery energy storage unit through a voltage control and regulation unit, the lithium battery energy storage unit is charged through the power management communication unit at one side, the micro inverter is supplied with power to the household loads or the power grid at the other side, and after the power management communication unit judges that the lithium battery energy storage unit is fully charged, the voltage control and regulation unit cuts off the charging of the lithium battery energy storage unit, and electric quantity generated by the photovoltaic panel is transmitted to the micro inverter to the household loads or the power grid at last;
(IV), a lithium battery energy storage module and a photovoltaic panel simultaneous discharge mode: when the light intensity is judged by the light power management communication unit, the independent discharge power of the photovoltaic panel cannot meet the power consumption of the household load, and when the power management communication unit judges that the lithium battery energy storage unit has electricity which can be discharged at the moment, the DSG MOS tube and the PV MOS tube in the power management communication unit are opened, the CHG MOS tube is closed, the photovoltaic panel and the lithium battery energy storage module supply power to the household load at the same time, and when the power management communication unit judges that the lithium battery energy storage unit has insufficient electricity and cannot continue to discharge, the power management communication unit cuts off the discharge of the lithium battery energy storage unit, and meanwhile, the power grid continues to supply power to the household load.
In the invention, the power management communication unit controls the on-off of the CHG MOS tube, the DSG MOS tube and the PV MOS tube through the MCU.
In the invention, the power management communication unit realizes the control of the discharge mode by detecting the voltage parameter.
Further, in the present invention, the discharging mode includes discharging only the lithium battery energy storage module, charging the lithium battery energy storage module by the photovoltaic panel, and discharging the household load or the power grid by the photovoltaic panel and simultaneously discharging the lithium battery energy storage module and the photovoltaic panel.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the invention, the energy generated by the photovoltaic panel is controlled and regulated by the power management communication unit and the voltage control and regulation unit and then transmitted to the micro inverter and then transmitted to the household load or the power grid, so that the household power demand of various forms such as solar power generation, lithium battery charging and discharging energy storage functions, off-grid power consumption and the like can be met;
2. the direct current generated by the photovoltaic panel is directly stored in the lithium battery energy storage module, so that the energy conversion efficiency is higher than that of the direct current stored in the lithium battery after passing through the inverter;
3. the lithium battery energy storage module can prevent the battery from being overcharged or overdischarged by detecting the voltage of the lithium battery energy storage unit, thereby playing a role in safety protection;
4. the voltage control and regulation unit can boost and buck the voltage of direct current generated by the photovoltaic panel so as to achieve charging voltage suitable for the lithium battery energy storage module, and realize charging of the lithium battery energy storage module, thereby realizing adaptation to the lithium battery energy storage modules with different voltage platforms;
5. the power management communication unit controls the on and off of the CHG MOS tube, the DSG MOS tube and the PV MOS tube through the MCU, so as to realize various functions such as charging and discharging;
6. the power management communication unit acquires the voltage of each string of batteries in the lithium battery energy storage unit through the MCU, judges whether the batteries are full or empty, and prevents overcharge and overdischarge by controlling the on-off of the CHG MOS tube and the DSG MOS tube to cut off the charging or discharging process;
7. the power management communication unit can collect the current through the MCU, judge whether overcurrent or open circuit, and open and close the cut-off circuit through the MOS tube, thereby playing roles of short-circuit protection and overcurrent protection;
8. the power management communication unit can be connected with the mobile terminal APP for remote monitoring and operation, so that a user can adjust the discharge mode by himself;
9. the voltage control regulating unit comprises an MPPT controller, and can perform an input voltage limiting function, namely after the maximum power point voltage of solar energy is set, as long as the voltage is lower than the value, the module can reduce output current, reduce output power and ensure that the input voltage is stabilized at a set value, and meanwhile, the voltage control regulating unit also has a charging protection function, and the lithium battery energy storage module can cut off charging after being fully charged, so that the overcharge of the lithium battery is avoided, and a secondary protection effect is achieved;
10. the intelligent switching device can realize intelligent switching between photovoltaic panel power supply and lithium battery energy storage module power supply, thereby realizing the use of electricity load under different illumination conditions and battery capacity conditions.
Drawings
FIG. 1 is a system block diagram of the present invention;
FIG. 2 is an electrical schematic diagram of a lithium battery energy storage module of the present invention;
FIG. 3 is a schematic diagram of a charging mode of a lithium-ion only battery energy storage module according to the present invention;
FIG. 4 is a schematic diagram of a discharging mode of a lithium-only battery energy storage module according to the present invention;
FIG. 5 is a schematic diagram of the photovoltaic panel of the present invention charging a lithium battery energy storage module and the photovoltaic panel discharging a household load or grid while in an on mode;
FIG. 6 is a schematic diagram of a simultaneous discharge mode of a lithium battery energy storage module and a photovoltaic panel according to the present invention;
FIG. 7 is an electrical schematic diagram of a voltage control regulator unit of the present invention;
FIG. 8 is an electrical schematic diagram of a BOOST mode of the voltage control regulator unit of the present invention;
FIG. 9 is an electrical schematic diagram of the voltage step-down BUCK mode of the voltage control and regulation unit of the present invention;
fig. 10 is an electrical schematic diagram of the voltage control and regulation unit MPPT input voltage regulation of the present invention;
in the figure: 1. a photovoltaic panel; 2. a lithium battery energy storage module; 21. a voltage control adjustment unit; 22. a power management communication unit; 23. a lithium battery energy storage unit; 3. a micro inverter; 4. a household load; 5. and (3) a power grid.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
Referring to fig. 1-10, the present invention provides the following technical solutions: the intelligent household energy storage system comprises a photovoltaic panel 1, a lithium battery energy storage module 2, a micro inverter 3, a household load 4 and a power grid 5, wherein the input end of the lithium battery energy storage module 2 is connected with the output end of the photovoltaic panel 1, the output end of the lithium battery energy storage module 2 is connected with the input end of the micro inverter 3, and the output end of the micro inverter 3 is respectively connected with the input ends of the power grid 5 and the household load 4;
the lithium battery energy storage module 2 comprises a voltage control and regulation unit 21, a power management communication unit 22 and a lithium battery energy storage unit 23, wherein the input end of the voltage control and regulation unit 21 is connected with the output end of the photovoltaic panel 1, the output end of the voltage control and regulation unit 21 is connected with the input end of the power management communication unit 22, the output end of the power management communication unit 22 is connected with the micro inverter 3, and the power management communication unit 22 is also connected with the lithium battery energy storage unit 23.
By adopting the technical scheme, the energy generated by the photovoltaic panel 1 is controlled and regulated by the power management communication unit 22 and the voltage control and regulation unit 21 and then is transmitted to the micro inverter 3 and then is transmitted to the household load 4 or the power grid 5, so that the household power demand of various forms such as solar power generation, lithium battery charge and discharge energy storage function, off-grid power consumption and the like can be met; the direct current generated by the photovoltaic panel 1 is directly stored in the lithium battery energy storage module 2, so that the energy conversion efficiency is higher than that of the direct current stored in the lithium battery after passing through the inverter;
the lithium battery energy storage module 2 can prevent the battery from being overcharged or overdischarged by detecting the voltage of the lithium battery energy storage unit, thereby playing a role in safety protection;
the voltage control and regulation unit 21 can boost and buck the voltage of direct current generated by the photovoltaic panel 1 so as to achieve charging voltage suitable for the lithium battery energy storage module 2, and charge the lithium battery energy storage module 2, so that the adaptation of lithium battery energy storage modules with different voltage platforms can be achieved.
Specifically, the power management communication unit 22 includes an MCU for data processing, a CHG MOS tube for controlling the opening and closing of charging, a DSG MOS tube for controlling the opening and closing of discharging, and a PV MOS tube for controlling the input of the voltage control and adjustment unit 21.
By adopting the technical scheme, the power management communication unit 22 controls the on-off of the CHG MOS tube, the DSG MOS tube and the PV MOS tube through the MCU, so as to realize various functions such as charging and discharging;
the power management communication unit 22 of the invention collects the voltage of each string of batteries in the lithium battery energy storage unit 23 through the MCU, judges whether the batteries are full or the electric quantity is empty, and prevents overcharge and overdischarge by controlling the on-off of the CHG MOS tube and the DSG MOS tube to cut off the charging or discharging process;
the power management communication unit 22 of the invention can collect the current through the MCU to judge whether overcurrent or break, and the MOS tube is used for opening and closing the cut-off circuit to play roles of short-circuit protection and overcurrent protection.
Example 2
This embodiment differs from embodiment 1 in that: specifically, the power management communication unit 22 further includes a wireless communication module. The wireless communication module is an RS485 communication module.
By adopting the above technical scheme, the power management communication unit 22 of the invention can be connected with the mobile terminal APP for remote monitoring and operation, so that a user can adjust the discharge mode by himself.
Example 3
This embodiment differs from embodiment 1 in that: specifically, the voltage control adjustment unit 21 includes an MPPT controller.
By adopting the technical scheme, the invention can perform an input voltage limiting function, namely after the voltage of the solar maximum power point is set, as long as the voltage is lower than the value, the module can reduce the output current, reduce the output power, ensure that the input voltage is stabilized at the set value, and meanwhile, the voltage control and regulation unit 21 also has a charging protection function, the lithium battery energy storage module 2 can be cut off to charge after being fully charged, thereby avoiding the overcharge of the lithium battery and playing a secondary protection role.
Example 4
This embodiment differs from embodiment 1 in that: specifically, as shown in fig. 7. The voltage control adjusting unit can realize the functions of voltage rising and falling and MPPT through the voltage management chip matched with the peripheral circuit and the control MOS tube, and the model of the voltage management chip in the embodiment is preferably LT8210.
BOOST mode as shown in fig. 8.
The voltage management chip starts the voltage boosting mode when judging VIN < VOUT through VC1 and FB pins: a=on, b=off, c=pwm, d=/PWM is equivalent to the normal boost circuit of fig. 8.
BUCK mode as shown in fig. 9.
When the voltage management chip judges that VIN > VOUT through the VC1 and FB pins, the voltage reduction mode A=PWM, B=/PWM, D=ON and C=OFF is started, and the voltage reduction circuit is equivalent to the common voltage reduction circuit in fig. 9. And different PWM signal duty ratios are regulated, so that stable VOUT output is realized.
MPPT input voltage regulation as shown in fig. 10.
CV_5V is a reference power supply, VIN input voltage is divided and then compared with the reference voltage to output current output by the control voltage management chip, and the MPPT voltage working point is stabilized. If the PV light becomes strong, the VIN voltage increases, the U5 output voltage (PIN 4) increases, and this voltage increase is fed back to the voltage management chip, which adjusts the PWM duty cycle to increase the output current (increase the output power). The output current increases to stabilize the PV input voltage VIN at the set voltage point. VR1 may adjust the MPPT operating voltage point.
Example 5
Further, the implementation method of the intelligent household energy storage system comprises the following steps:
(one), lithium battery energy storage module 2 charging mode only: when the power management communication unit 22 judges that the illumination intensity enables the discharge power of the photovoltaic panel 1 to meet the charging requirement of the lithium battery energy storage unit 23, if the power management communication unit 22 judges that the lithium battery energy storage unit 23 is not fully charged at the moment and the household load 4 or the power grid 5 does not need to be discharged, a CHG MOS tube in the power management communication unit 22 is started, the DSG MOS tube and the PV MOS tube are closed, a direct current power supply generated by the photovoltaic panel 1 rises or drops the voltage to a charging voltage suitable for charging the lithium battery energy storage unit 23 through the voltage control and regulation unit 21, the lithium battery energy storage unit 23 is charged through the power management communication unit 22, and when the power management communication unit 22 judges that the lithium battery energy storage unit 23 is fully charged, the CHG MOS tube is closed, and the voltage control and regulation unit 21 is cut off for charging the lithium battery energy storage unit 23;
(II), only lithium battery energy storage module 2 discharge mode: when the power management communication unit 22 judges that the discharge power of the photovoltaic panel 1 cannot meet the requirement that the lithium battery energy storage unit 23 is charged, if the power management communication unit 22 judges that the lithium battery energy storage unit 23 has electricity which can be discharged at the moment, the voltage control and regulation unit 21 does not work, at the moment, a DSG MOS tube in the power management communication unit 22 is started, a CHG MOS tube and a PV MOS tube are closed, the lithium battery energy storage unit 23 directly transmits a direct current power supply to the micro inverter 3 through the power management communication unit 22, and then the lithium battery energy storage unit 23 supplies power to the household load 4 or the power grid 5, and if the power management communication unit 22 judges that the electricity of the lithium battery energy storage unit 23 is insufficient to be discharged at the moment, the DSG MOS tube is closed, and the discharging process is disconnected;
(III), charging the lithium battery energy storage module 2 by the photovoltaic panel 1 and discharging the household load 4 or the power grid 5 by the photovoltaic panel 1 in a simultaneous on mode: when the power management communication unit 22 judges that the illumination intensity enables the discharge power of the photovoltaic panel 1 to meet the household load power consumption, if the power management communication unit 22 judges that the lithium battery energy storage unit 23 is not fully charged at the moment, a DSG MOS tube in the power management communication unit 22 is closed, a CHG MOS tube and a PV MOS tube are opened at the moment, a direct current power supply generated by the photovoltaic panel 1 rises or drops the voltage to a charging voltage suitable for charging the lithium battery energy storage unit 23 through the voltage control and regulation unit 21, the lithium battery energy storage unit 23 is charged through the power management communication unit 22, the micro inverter 3 is supplied with power to the household load 4 or the power grid 5 through one side, and after the power management communication unit 22 judges that the lithium battery energy storage unit 23 is fully charged, the voltage control and regulation unit 21 cuts off the charging of the lithium battery energy storage unit 23, and electric quantity generated by the photovoltaic panel 1 is transmitted to the micro inverter 3 to the household load 4 or the power grid 5 finally;
(IV), simultaneous discharge mode of the lithium battery energy storage module 2 and the photovoltaic panel 1: when the light intensity is judged by the light power management communication unit 22 so that the independent discharge power of the photovoltaic panel 1 cannot meet the electric power for the household load, and when the power management communication unit 22 judges that the lithium battery energy storage unit 23 has electric quantity and can discharge, the DSG MOS tube and the PV MOS tube in the power management communication unit 22 are started, the CHG MOS tube is closed, the photovoltaic panel 1 and the lithium battery energy storage module 2 supply power to the household load 4 at the same time, and when the power management communication unit 22 judges that the lithium battery energy storage unit 23 has insufficient electric quantity and can not continue to discharge, the power management communication unit 22 cuts off the discharge of the lithium battery energy storage unit 23, and meanwhile, the power grid 5 continues to supply power to the household load 4.
Specifically, the power management communication unit 22 controls the CHG MOS transistor, the DSG MOS transistor, and the PV MOS transistor to be turned on or off through the MCU.
By adopting the technical scheme, various functions such as charge and discharge are realized.
Specifically, the power management communication unit 22 realizes control of the discharge mode by detecting the voltage parameter. The discharging mode includes discharging only the lithium battery energy storage module 2, charging the lithium battery energy storage module 2 by the photovoltaic panel 1, discharging the household load 4 or the power grid 5 by the photovoltaic panel 1, and discharging the lithium battery energy storage module 2 and the photovoltaic panel 1 simultaneously.
By adopting the technical scheme, the intelligent switching between the power supply of the photovoltaic panel 1 and the power supply of the lithium battery energy storage module 2 can be realized, so that the use of electricity loads under different illumination conditions and battery capacity conditions is realized.
In summary, the energy generated by the photovoltaic panel 1 is controlled and regulated by the power management communication unit 22 and the voltage control and regulation unit 21, and then is transmitted to the micro inverter 3 and then is transmitted to the household load 4 or the power grid 5, so that the energy storage requirements of solar power generation, lithium battery charging and discharging and energy storage functions, off-grid power consumption and other household power consumption requirements can be met; the direct current generated by the photovoltaic panel 1 is directly stored in the lithium battery energy storage module 2, so that the energy conversion efficiency is higher than that of the direct current stored in the lithium battery after passing through the inverter; the lithium battery energy storage module 2 can prevent the battery from being overcharged or overdischarged by detecting the voltage of the lithium battery energy storage unit, thereby playing a role in safety protection; the voltage control and regulation unit 21 can boost and buck the voltage of direct current generated by the photovoltaic panel 1 so as to achieve charging voltage suitable for the lithium battery energy storage module 2, and charge the lithium battery energy storage module 2, so that the adaptation of lithium battery energy storage modules with different voltage platforms can be realized; the power management communication unit 22 controls the on and off of the CHG MOS tube, the DSG MOS tube and the PV MOS tube through the MCU to realize various functions such as charging and discharging; the power management communication unit 22 of the invention collects the voltage of each string of batteries in the lithium battery energy storage unit 23 through the MCU, judges whether the batteries are full or the electric quantity is empty, and prevents overcharge and overdischarge by controlling the on-off of the CHG MOS tube and the DSG MOS tube to cut off the charging or discharging process; the power management communication unit 22 can collect the current through the MCU to judge whether overcurrent or open circuit, and the MOS tube is used for opening and closing the cut-off circuit to play roles of short-circuit protection and overcurrent protection; the power management communication unit 22 of the invention can be connected with the mobile terminal APP for remote monitoring and operation, so that a user can adjust the discharge mode by himself; the voltage control and regulation unit 21 comprises an MPPT controller, and can perform an input voltage limiting function, namely after the maximum power point voltage of solar energy is set, as long as the voltage is lower than the value, the module can reduce output current, reduce output power and ensure that the input voltage is stabilized at a set value, meanwhile, the voltage control and regulation unit 21 also has a charging protection function, the charging of the lithium battery energy storage module 2 is cut off after the lithium battery energy storage module is fully charged, so that the overcharge of the lithium battery is avoided, and a secondary protection function is realized; the intelligent switching device can realize intelligent switching between power supply of the photovoltaic panel 1 and power supply of the lithium battery energy storage module 2, so that the use of electricity loads under different illumination conditions and battery capacity conditions is realized.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (9)
1. An intelligent household energy storage system, characterized in that: the household power supply system comprises a photovoltaic panel, a lithium battery energy storage module, a micro inverter, a household load and a power grid, wherein the input end of the lithium battery energy storage module is connected with the output end of the photovoltaic panel, the output end of the lithium battery energy storage module is connected with the input end of the micro inverter, and the output end of the micro inverter is respectively connected with the power grid and the input end of the household load;
the lithium battery energy storage module comprises a voltage control adjusting unit, a power management communication unit and a lithium battery energy storage unit, wherein the input end of the voltage control adjusting unit is connected with the output end of the photovoltaic panel, the output end of the voltage control adjusting unit is connected with the input end of the power management communication unit, the output end of the power management communication unit is connected with the micro inverter, and the power management communication unit is further connected with the lithium battery energy storage unit.
2. An intelligent home energy storage system according to claim 1, wherein: the power management communication unit comprises an MCU for data processing, a CHG MOS tube for controlling the opening and closing of charging, a DSG MOS tube for controlling the opening and closing of discharging and a PV MOS tube for controlling the input of the voltage control and regulation unit.
3. An intelligent home energy storage system according to claim 2, wherein: the power management communication unit also comprises a wireless communication module.
4. A smart home energy storage system as claimed in claim 3, wherein: the wireless communication module is an RS485 communication module.
5. An intelligent home energy storage system according to claim 1, wherein: the voltage control and regulation unit comprises an MPPT controller.
6. A method of implementing an intelligent home energy storage system according to any one of claims 1-5, comprising the steps of:
(one), lithium battery energy storage module charging mode only: when the power management communication unit judges that the discharge power of the photovoltaic panel meets the charging requirement of the lithium battery energy storage unit, if the power management communication unit judges that the lithium battery energy storage unit is not fully charged at the moment and a household load or a power grid does not need to be discharged, a CHG MOS tube in the power management communication unit is started, the DSG MOS tube and the PV MOS tube are closed, a direct current power supply generated by the photovoltaic panel rises or drops the voltage to a charging voltage suitable for charging the lithium battery energy storage unit through the voltage control and regulation unit, the lithium battery energy storage unit is charged through the power management communication unit, and after the power management communication unit judges that the lithium battery energy storage unit is fully charged, the CHG MOS tube is closed, and the voltage control and regulation unit cuts off the charging of the lithium battery energy storage unit;
(II) discharging mode of the lithium battery energy storage module only: when the power management communication unit judges that the illumination intensity cannot enable the discharge power of the photovoltaic panel to meet the charging requirement of the lithium battery energy storage unit, if the power management communication unit judges that the lithium battery energy storage unit has electricity which can be discharged at the moment, the voltage control adjustment unit does not work, at the moment, a DSG MOS tube in the power management communication unit is started, a CHG MOS tube and a PV MOS tube are closed, the lithium battery energy storage unit directly transmits a direct-current power supply to the micro inverter through the power management communication unit and then supplies power to a household load or a power grid, and if the power management communication unit judges that the electricity of the lithium battery energy storage unit is insufficient to discharge at the moment, the DSG MOS tube is closed, and the discharging process is disconnected;
and (III), charging the lithium battery energy storage module by the photovoltaic panel and discharging the household load or the power grid by the photovoltaic panel in a simultaneous starting mode: when the power management communication unit judges that the illumination intensity enables the discharge power of the photovoltaic panel to meet the electric power for household loads, if the power management communication unit judges that the lithium battery energy storage unit is not fully charged at the moment, a DSG MOS tube in the power management communication unit is closed, a CHG MOS tube and a PV MOS tube are opened, a direct-current power supply generated by the photovoltaic panel rises or drops the voltage to a charging voltage suitable for charging the lithium battery energy storage unit through a voltage control and regulation unit, the lithium battery energy storage unit is charged through the power management communication unit at one side, the micro inverter is supplied with power to the household loads or the power grid at the other side, and after the power management communication unit judges that the lithium battery energy storage unit is fully charged, the voltage control and regulation unit cuts off the charging of the lithium battery energy storage unit, and electric quantity generated by the photovoltaic panel is transmitted to the micro inverter to the household loads or the power grid at last;
(IV), a lithium battery energy storage module and a photovoltaic panel simultaneous discharge mode: when the light intensity is judged by the light power management communication unit, the independent discharge power of the photovoltaic panel cannot meet the power consumption of the household load, and when the power management communication unit judges that the lithium battery energy storage unit has electricity which can be discharged at the moment, the DSG MOS tube and the PV MOS tube in the power management communication unit are opened, the CHG MOS tube is closed, the photovoltaic panel and the lithium battery energy storage module supply power to the household load at the same time, and when the power management communication unit judges that the lithium battery energy storage unit has insufficient electricity and cannot continue to discharge, the power management communication unit cuts off the discharge of the lithium battery energy storage unit, and meanwhile, the power grid continues to supply power to the household load.
7. The method for implementing an intelligent home energy storage system according to claim 6, wherein: the power management communication unit controls the on-off of the CHG MOS tube, the DSG MOS tube and the PV MOS tube through the MCU.
8. The method for implementing an intelligent home energy storage system according to claim 6, wherein: the power management communication unit realizes the control of the discharge mode by detecting the voltage parameter.
9. The method for implementing an intelligent home energy storage system according to claim 8, wherein: the discharging mode comprises discharging of the lithium battery energy storage module, charging of the lithium battery energy storage module by the photovoltaic panel, discharging of the household load or the power grid by the photovoltaic panel, and simultaneous discharging of the lithium battery energy storage module and the photovoltaic panel.
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| CN117081221A (en) * | 2023-10-18 | 2023-11-17 | 速源芯(东莞)能源科技有限公司 | Energy optimization management system of household intelligent energy storage power supply |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117081221A (en) * | 2023-10-18 | 2023-11-17 | 速源芯(东莞)能源科技有限公司 | Energy optimization management system of household intelligent energy storage power supply |
| CN117081221B (en) * | 2023-10-18 | 2024-02-09 | 速源芯(东莞)能源科技有限公司 | Energy optimization management system of household intelligent energy storage power supply |
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