CN113824141A - Photovoltaic energy storage battery management system - Google Patents
Photovoltaic energy storage battery management system Download PDFInfo
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- CN113824141A CN113824141A CN202110895643.7A CN202110895643A CN113824141A CN 113824141 A CN113824141 A CN 113824141A CN 202110895643 A CN202110895643 A CN 202110895643A CN 113824141 A CN113824141 A CN 113824141A
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- 238000004146 energy storage Methods 0.000 title claims abstract description 117
- 238000010248 power generation Methods 0.000 claims abstract description 75
- 238000005286 illumination Methods 0.000 claims description 11
- 238000004891 communication Methods 0.000 claims description 6
- 238000007599 discharging Methods 0.000 claims description 5
- 210000000352 storage cell Anatomy 0.000 claims description 3
- 230000008901 benefit Effects 0.000 description 4
- 230000005611 electricity Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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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
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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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
- H02J7/0048—Detection of remaining charge capacity or state of charge [SOC]
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/22—The renewable source being solar energy
- H02J2300/24—The renewable source being solar energy of photovoltaic origin
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- 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]
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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
- 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
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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
- 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
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses a photovoltaic energy storage battery management system, which comprises a photovoltaic assembly, a photovoltaic controller, an energy storage battery, a battery management module, a first inverter, a first switching device and a control module, wherein the photovoltaic assembly is connected with the photovoltaic controller; the photovoltaic controller is electrically connected between the photovoltaic assembly and the first inverter; the energy storage battery is electrically connected to the photovoltaic controller and the first inverter respectively; the photovoltaic energy storage battery management system provided by the invention can finely control the energy storage battery through the control module, namely the energy storage battery is specifically controlled to be charged or discharged according to the power generation condition of the photovoltaic module and the residual electric quantity condition of the energy storage battery.
Description
Technical Field
The invention relates to the technical field of photovoltaic power generation, in particular to a photovoltaic energy storage battery management system.
Background
With the increasingly poor earth resources, the investment cost of basic energy is increasingly rising, and various potential safety and pollution hazards accompanied with basic energy engineering are ubiquitous. Therefore, solar energy is increasingly regarded as an inexhaustible safe and environment-friendly new energy.
The distributed photovoltaic power generation technology has the advantages of wide energy distribution, convenience in installation and easiness in control, can enhance the operation stability of a power grid, has huge environmental protection and economic attraction, and is widely concerned and widely popularized.
For a user, the distributed photovoltaic power generation system with the storage battery is installed, photovoltaic power generation and storage battery power supply can be relied on when a power grid is powered off, the stability of household power supply can be guaranteed, and at the present stage, a government has financial subsidies on the distributed photovoltaic power generation and allows surplus power to be on the internet.
For a power grid company, the popularization of the distributed photovoltaic power generation system can enable the electricity consumption of residents to meet the requirements of nearby power generation, nearby grid connection, nearby conversion and nearby use, and effectively solves the problem of loss of electric power in voltage boosting and long-distance transportation. In addition, in the overall view, the distributed photovoltaic power generation system can provide the functions of peak clipping and valley filling for the power grid, and the stability of the power grid is enhanced.
The existing distributed photovoltaic power generation system is mostly a household photovoltaic power generation system, and an energy storage battery is adopted to store or release electric energy so as to stably supply power for users and ensure the reliability and the electric energy quality of power supply. However, the energy storage battery of the existing photovoltaic power generation system is only passively charged and discharged, and the application mode is more original and primary.
Disclosure of Invention
The invention mainly aims to provide a photovoltaic energy storage battery management system, and aims to solve the problems that an energy storage battery of an existing photovoltaic power generation system is only passively charged and discharged, and the application mode is relatively original and primary.
The technical scheme provided by the invention is as follows:
a photovoltaic energy storage battery management system comprises a photovoltaic assembly, a photovoltaic controller, an energy storage battery, a battery management module, a first inverter, a first switching device and a control module; the photovoltaic controller is electrically connected between the photovoltaic assembly and the first inverter; the energy storage battery is electrically connected to the photovoltaic controller and the first inverter respectively; the first inverter is electrically connected to a household load through the first switching device; the external power grid is electrically connected to the first switching device; the battery management module is connected to the energy storage battery; the control module is respectively in communication connection with the photovoltaic controller, the battery management module and the first switching device;
the photovoltaic controller is used for outputting the power of the photovoltaic assembly to the energy storage battery or the first inverter; the first inverter is used for converting direct current from the photovoltaic assembly or the energy storage battery into alternating current; the first switching device is used for controlling an external power grid to supply power to the household load or supplying the output electric energy of the first inverter to the household load;
the control module is used for controlling the charging or discharging of the energy storage battery through the photovoltaic controller and the battery management module, and switching the power supply source of the household load through the first switching device.
Preferably, the control module is further configured to obtain the battery remaining capacity of the energy storage battery through the battery management module; the control module is further used for controlling the energy storage battery to stop outputting electric energy to the first inverter through the battery management module when the residual electric quantity of the battery is smaller than a first preset value, controlling an external power grid to supply power to the household load through the first switching device, and then controlling the photovoltaic module to charge the energy storage battery through the photovoltaic controller.
Preferably, the control module is further configured to obtain historical power generation information in a first preset time period in the past, and establish a power generation power prediction model, where the historical power generation information includes a historical time, a historical illumination intensity and a historical temperature corresponding to the historical time, and a historical power generation power at each time in a second preset time period with the historical time as a starting point;
the control module is further configured to use the historical time, the historical illumination intensity and the historical temperature as input values of the generated power prediction model, and use the historical generated power at each time within a second preset time period in which the historical time is a starting point as the output value to train the generated power prediction model;
the control module is further configured to input the current time, the current temperature and the current illumination intensity into the generated power prediction model every other second preset time period, so as to obtain the generated power at each time within the second preset time period with the current time as a starting point;
the control module is further used for controlling the photovoltaic module to supply power to the household load through the photovoltaic controller and then controlling an external power grid to supply power to the household load through the first switching device when the residual electric quantity of the battery is larger than a second preset value and 0 generating power exists in the generating power at each moment in a second preset time period with the current moment as a starting point.
Preferably, the control module is further configured to control the photovoltaic module to supply power to the home load through the photovoltaic controller and then control an external power grid to stop supplying power to the home load through the first switching device when the remaining battery capacity is greater than the second preset value and no generated power of 0 exists in generated power at each time within the second preset time period when the current time is the starting point; the second preset value is greater than the first preset value.
Preferably, the control module is further configured to, when the remaining battery capacity is greater than the second preset value and the generated power at each time within the second preset time period when the current time is the starting point is all 0, control the energy storage battery to output electric energy to the first inverter through the battery management module, and then control an external power grid to stop supplying power to the home load through the first switching device.
Preferably, the control module is further configured to control an external power grid to supply power to the home load through the first switching device when the remaining battery capacity is smaller than the first preset value and 0 generated power exists in the generated power at each time within the second preset time period when the current time is the starting point, and then control the energy storage battery to stop outputting electric energy to the first inverter through the battery management module.
Preferably, the system further comprises a second inverter and a second switching device; the second inverter is electrically connected to the photovoltaic controller, and the second switching device is electrically connected to the second inverter and an external power grid respectively; the second inverter is used for converting direct current from the photovoltaic module into alternating current; the second switching device is used for connecting the output power of the second inverter with an external power grid; the control module is in communication connection with the second switching device.
Preferably, the control module is further configured to obtain historical weather information of each day in the past first preset time period and the corresponding power generation amount of each day, and establish a power generation amount prediction model; the control module is further configured to use historical weather information of each day in the past first preset time period as an input value of the power generation amount prediction model, and use power generation amount of each day in the past first preset time period as an output value to train the power generation amount prediction model, wherein the weather information is any one of cloudy days, rainy days and sunny days;
the control module is further used for obtaining the predicted weather information of each day in the third future preset time period, and inputting the predicted weather information of each day in the third future preset time period into the power generation amount prediction model every other day to obtain the predicted power generation amount of each day in the third future preset time period so as to obtain the predicted total power generation amount of the third future preset time period;
the control module is further used for controlling the energy storage battery to stop outputting electric energy to the first inverter within a third preset time period in the future through the battery management module when the predicted total power generation amount is lower than a third preset value and the residual electric energy value is lower than a fourth preset value; the fourth preset value is greater than the first preset value.
Preferably, the control module is further configured to control the photovoltaic module to charge the energy storage battery through the photovoltaic controller when the predicted total power generation amount is lower than a third preset value and the residual power amount value is lower than a fifth preset value; the fifth preset value is smaller than the fourth preset value.
Preferably, the control module is further configured to, when the predicted total power generation amount is higher than a sixth preset value and the residual power amount value is higher than the second preset value, control the energy storage battery to output electric energy to the first inverter through the battery management module, then control an external power grid to stop supplying power to the home load through the first switching device, and then control the photovoltaic module to be connected to an external power grid through the photovoltaic controller and the second switching device.
Through above-mentioned technical scheme, can realize following beneficial effect:
the photovoltaic energy storage battery management system provided by the invention can finely control the energy storage battery through the control module, namely the energy storage battery is specifically controlled to be charged or discharged according to the power generation condition of the photovoltaic module and the residual electric quantity condition of the energy storage battery.
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 structural diagram of an embodiment of a photovoltaic energy storage cell management system according to the present invention.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The invention provides a photovoltaic energy storage battery management system.
As shown in fig. 1, in an embodiment of a photovoltaic energy storage battery management system provided by the present invention, the system includes a photovoltaic module (i.e., a photovoltaic power generation panel), a photovoltaic controller, an energy storage battery, a battery management module, a first inverter, a first switching device, and a control module; the photovoltaic controller is electrically connected between the photovoltaic assembly and the first inverter; the energy storage battery is electrically connected to the photovoltaic controller and the first inverter respectively; the first inverter is electrically connected to a household load through the first switching device; the external power grid is electrically connected to the first switching device; the battery management module is connected to the energy storage battery; the control module is respectively in communication connection with the photovoltaic controller, the battery management module and the first switching device.
The photovoltaic controller is used for outputting the power of the photovoltaic assembly to the energy storage battery or the first inverter; the first inverter is used for converting direct current from the photovoltaic assembly or the energy storage battery into alternating current; the first switching device is used for controlling an external power grid to supply power to the household load or supplying the output electric energy of the first inverter to the household load.
The control module is used for controlling the charging or discharging of the energy storage battery through the photovoltaic controller and the battery management module, namely the control module can specifically control the energy storage battery to charge or discharge according to the power generation condition of the photovoltaic module and the residual electric quantity condition of the energy storage battery, wherein the discharging is to supply power to a household load; and switching the power supply of the household load through the first switching device, namely the power supply of the household load can be any one or more of an energy storage battery, a photovoltaic assembly or an external power grid.
The photovoltaic energy storage battery management system provided by the invention can finely control the energy storage battery through the control module, namely the energy storage battery is specifically controlled to be charged or discharged according to the power generation condition of the photovoltaic module and the residual electric quantity condition of the energy storage battery.
In addition, in another embodiment of the photovoltaic energy storage battery management system provided by the present invention, the control module is further configured to obtain the battery remaining capacity of the energy storage battery through the battery management module; the control module is further used for controlling the energy storage battery to stop outputting electric energy to the first inverter through the battery management module when the residual electric quantity of the battery is smaller than a first preset value, controlling an external power grid to supply power to the household load through the first switching device, and then controlling the photovoltaic module to charge the energy storage battery through the photovoltaic controller.
Specifically, the first preset value is preferably 20% of the total capacity of the energy storage battery, for example, when the total capacity of the energy storage battery is 100kW · h, the first preset value is 20kW · h, so that shallow charging of the energy storage battery is achieved, and the service life of the energy storage battery is prolonged.
Meanwhile, in another embodiment of the photovoltaic energy storage cell management system provided by the present invention, the control module is further configured to obtain historical power generation information in a first preset time period (preferably 1 year) in the past, and establish a power generation prediction model, where the historical power generation information includes a historical time, and a historical illumination intensity, a historical temperature corresponding to the historical time, and a historical power generation power at each time (where the time interval is 1 minute) in a second preset time period (preferably 1 hour) with the historical time as a starting point.
The control module is further configured to use the historical time, the historical illumination intensity and the historical temperature as input values of the generated power prediction model, and use the historical generated power at each time within a second preset time period in which the historical time is a starting point as the output value to train the generated power prediction model.
The control module is further configured to input the current time, the current temperature and the current illumination intensity into the generated power prediction model every other second preset time period, so as to obtain the generated power at each time within the second preset time period with the current time as a starting point; namely, the generated power per minute in the next 1 hour from the current time (the generated power is the predicted power) is obtained.
The control module is further configured to control the photovoltaic module to supply power to the home load through the photovoltaic controller and then control an external power grid to supply power to the home load through the first switching device when the remaining battery capacity is greater than a second preset value (preferably 80% of the total capacity of the energy storage battery) and the generated power of 0 exists in the generated power at each time within a second preset time period when the current time is a starting point.
Specifically, when 0 generated power exists in the generated power of each minute within 1 hour in the future with the current moment as the starting point, it is indicated that the future 1 hour may enter night, or a cloudy day with relatively low illumination intensity is encountered, and the remaining capacity of the energy storage battery is greater than 80%, so that the photovoltaic module can be directly controlled to supply power to the home load (so that the energy storage battery does not need to be charged any more), but because the generated power of the photovoltaic module within 1 hour in the future may be 0, an external power grid is also required to supply power to the home load, so as to prevent the home load from lacking electric energy due to the abrupt decrease of the generated power of the photovoltaic module.
Meanwhile, the control module is further configured to control the photovoltaic module to supply power to the home load through the photovoltaic controller and then control an external power grid to stop supplying power to the home load through the first switching device when the remaining battery capacity is greater than the second preset value and no generated power of 0 exists in generated power at each moment in the second preset time period when the current moment is the starting point; the second preset value is greater than the first preset value.
Specifically, when the generated power of 0 does not exist in the generated power of each minute within 1 hour in the future with the current moment as the starting point, it indicates that the power generation of the photovoltaic module is relatively stable within 1 hour in the future, and the residual electric quantity of the energy storage battery is more than 80%, so that the photovoltaic module can be directly controlled to supply power to the household load (so that the energy storage battery does not need to be charged any more); and because the power generation of the photovoltaic module is stable in the future 1 hour, the first switching device can control an external power grid to stop supplying power to the household load.
In addition, the control module is further configured to control the energy storage battery to output electric energy to the first inverter through the battery management module when the remaining battery capacity is greater than the second preset value and the generated power at each time within the second preset time period when the current time is the starting point is all 0, and then control an external power grid to stop supplying power to the home load through the first switching device.
Specifically, the generated power of each minute in the next 1 hour with the current moment as the starting point is all 0, which indicates that the photovoltaic module does not generate power any more when the next 1 hour enters the night, so that the power can be directly supplied to the household load through the energy storage battery at the moment, and the external power grid is controlled by the first switching device to stop supplying power to the household load, namely, the external power grid does not supply power to the household load any more, namely, the power is supplied to the household load through the energy storage battery completely, so that the electric charge is reduced.
Meanwhile, the control module is further configured to control an external power grid to supply power to the home load through the first switching device and then control the energy storage battery to stop outputting electric energy to the first inverter through the battery management module when the remaining battery capacity is smaller than the first preset value and 0 generated power exists in the generated power at each moment in the second preset time period when the current moment is the starting point.
Specifically, when 0 generated power exists in the generated power of each minute within 1 hour in the future with the current time as the starting point, it indicates that the electricity may enter the night in the future 1 hour or encounter a cloudy day with relatively low illumination intensity; and the residual electric quantity of the battery is less than 20%, the photovoltaic module and the energy storage battery cannot stably supply power to the household load, so that the first switching device controls an external power grid to supply power to the household load so as to meet the normal requirement of the household load; and the battery management module controls the energy storage battery to stop outputting electric energy to the first inverter, namely, the energy storage battery is stopped supplying power to the outside, so that the energy storage battery is prevented from over-discharging, and the healthy operation of the energy storage battery is ensured.
In another embodiment of the photovoltaic energy storage battery management system provided by the present invention, based on the above embodiment, the photovoltaic energy storage battery management system further includes a second inverter and a second switching device; the second inverter is electrically connected to the photovoltaic controller, and the second switching device is electrically connected to the second inverter and an external power grid respectively; the second inverter is used for converting direct current from the photovoltaic module into alternating current; the second switching device is used for connecting the output power of the second inverter with an external power grid; the control module is in communication connection with the second switching device. Through setting up second auto-change over device and second inverter to make photovoltaic module can directly supply power to external power grids being incorporated into the power networks, with merge the unnecessary generated energy into external power grids, rationally do benefit to photovoltaic electric energy, obtain relevant economic benefits.
In addition, the control module is further used for acquiring historical weather information of each day in the first preset time period in the past (namely the past 1 year) and corresponding power generation amount of each day, and establishing a power generation amount prediction model; the control module is further configured to use historical weather information of each day in the past first preset time period as an input value of the power generation amount prediction model, and use power generation amount of each day in the past first preset time period as an output value to train the power generation amount prediction model, wherein the weather information is any one of cloudy days, rainy days and sunny days.
The control module is further configured to obtain predicted weather information of each day in a third preset time period (preferably 7 days) in the future, and input the predicted weather information of each day in the third preset time period in the future into the power generation amount prediction model every other day to obtain predicted power generation amount of each day in the third preset time period in the future, so as to obtain predicted total power generation amount of the third preset time period in the future, and obtain predicted total power generation amount of 7 days in the future.
The control module is further used for controlling the energy storage battery to stop outputting electric energy to the first inverter within a third preset time period in the future through the battery management module when the predicted total power generation amount is lower than a third preset value and the residual electric energy value is lower than a fourth preset value; the fourth preset value is greater than the first preset value.
Specifically, the third preset value here represents a level at which the power generation amount of the photovoltaic module is relatively low within 7 days, and is lower than the third preset value, which indicates that the power generation amount of the photovoltaic module is relatively low in 7 days in the future, and in this embodiment, the third preset value is preferably 10kW · h. The fourth preset value is greater than the first preset value and is close to the first preset value, and is preferably 30% of the total capacity of the energy storage battery in the embodiment, so that the fourth preset value is 30kW · h.
When the predicted total power generation amount of the photovoltaic assembly in the future 7 days is less than 10 kW.h, and the residual power of the energy storage battery is less than 30 kWh.h, the photovoltaic assembly can charge the energy storage battery less in the future 7 days, and in order to prevent the reduction value of the energy storage battery due to natural loss of power in the future 7 days from being lower than a first preset value (namely 20 kWh.h), the battery management module controls the energy storage battery to stop outputting electric energy to the first inverter in a third preset time period (7 days) in the future, namely the energy storage battery stops supplying power to the outside in the future 7 days until the residual power of the energy storage battery is greater than 50% of the total capacity of the energy storage battery, or the predicted total power generation amount of the photovoltaic assembly in the future 7 days is greater than 10 kWh.h.
Meanwhile, the control module is further used for controlling the photovoltaic assembly to charge the energy storage battery through the photovoltaic controller when the predicted total power generation amount is lower than a third preset value and the residual power value is lower than a fifth preset value; the fifth preset value is smaller than the fourth preset value.
The fifth preset value is smaller than the fourth preset value and is close to the first preset value, and is preferably 25% of the total capacity of the energy storage battery in the embodiment, so that the fourth preset value is 25kW · h.
When the predicted total power generation amount of the photovoltaic module in the future 7 days is less than 10 kW.h and the residual power of the energy storage battery is less than 25 kWh.h, the fact that the power of the energy storage battery approaches the lower limit value of shallow charging means requires timely charging of the energy storage battery is indicated, and therefore the photovoltaic module is directly controlled by the photovoltaic controller to charge the energy storage battery.
In addition, the control module is further configured to control the energy storage battery to output electric energy to the first inverter through the battery management module when the predicted total power generation amount is higher than a sixth preset value and the residual electric energy value is higher than the second preset value, then control an external power grid to stop supplying power to the home load through the first switching device, and then control the photovoltaic module to be connected to the external power grid through the photovoltaic controller and the second switching device.
Specifically, the sixth preset value here represents a level value at which the power generation amount of the photovoltaic module is relatively high in 7 days, and is higher than the sixth preset value, which indicates that the power generation amount of the photovoltaic module is relatively high in 7 days in the future, and in this embodiment, the sixth preset value is preferably 70kW · h.
When the predicted total power generation amount of the photovoltaic module in the future 7 days is larger than 70 kW.h and the residual power of the energy storage battery is higher than 80 kWh.h, the predicted total power generation amount of the photovoltaic module in the future 7 days is sufficient, and the residual power of the energy storage battery is sufficient, so that the energy storage battery is controlled by the battery management module to output electric energy to the first inverter (namely the energy storage battery supplies power to the household load), then the external power grid is controlled by the first switching device to stop supplying power to the household load, then the photovoltaic module is controlled by the photovoltaic controller and the second switching device to be connected with the external power grid, namely the electric energy generated by the photovoltaic module supplies power to the external power grid, so that the redundant power is reasonably utilized, and the economic benefit of photovoltaic power generation is obtained.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, wherein the software product is stored in a storage medium (such as ROM/RAM, magnetic disk, optical disk), and includes instructions for enabling a terminal (such as a mobile phone, a computer, a server, an air conditioner, or a network device) to execute the method according to the embodiments of the present invention.
While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. A photovoltaic energy storage battery management system is characterized by comprising a photovoltaic assembly, a photovoltaic controller, an energy storage battery, a battery management module, a first inverter, a first switching device and a control module; the photovoltaic controller is electrically connected between the photovoltaic assembly and the first inverter; the energy storage battery is electrically connected to the photovoltaic controller and the first inverter respectively; the first inverter is electrically connected to a household load through the first switching device; the external power grid is electrically connected to the first switching device; the battery management module is connected to the energy storage battery; the control module is respectively in communication connection with the photovoltaic controller, the battery management module and the first switching device;
the photovoltaic controller is used for outputting the power of the photovoltaic assembly to the energy storage battery or the first inverter; the first inverter is used for converting direct current from the photovoltaic assembly or the energy storage battery into alternating current; the first switching device is used for controlling an external power grid to supply power to the household load or supplying the output electric energy of the first inverter to the household load;
the control module is used for controlling the charging or discharging of the energy storage battery through the photovoltaic controller and the battery management module, and switching the power supply source of the household load through the first switching device.
2. The photovoltaic energy storage battery management system according to claim 1, wherein the control module is further configured to obtain a battery remaining capacity of the energy storage battery through the battery management module; the control module is further used for controlling the energy storage battery to stop outputting electric energy to the first inverter through the battery management module when the residual electric quantity of the battery is smaller than a first preset value, controlling an external power grid to supply power to the household load through the first switching device, and then controlling the photovoltaic module to charge the energy storage battery through the photovoltaic controller.
3. The photovoltaic energy storage battery management system according to claim 2, wherein the control module is further configured to obtain historical power generation information in a first preset time period in the past, and establish a power generation prediction model, where the historical power generation information includes a historical time, and a historical illumination intensity, a historical temperature, and a historical power generation power at each time in a second preset time period with the historical time as a starting point, which correspond to the historical time;
the control module is further configured to use the historical time, the historical illumination intensity and the historical temperature as input values of the generated power prediction model, and use the historical generated power at each time within a second preset time period in which the historical time is a starting point as the output value to train the generated power prediction model;
the control module is further configured to input the current time, the current temperature and the current illumination intensity into the generated power prediction model every other second preset time period, so as to obtain the generated power at each time within the second preset time period with the current time as a starting point;
the control module is further used for controlling the photovoltaic module to supply power to the household load through the photovoltaic controller and then controlling an external power grid to supply power to the household load through the first switching device when the residual electric quantity of the battery is larger than a second preset value and 0 generating power exists in the generating power at each moment in a second preset time period with the current moment as a starting point.
4. The photovoltaic energy storage battery management system according to claim 3, wherein the control module is further configured to control the photovoltaic module to supply power to the home load through the photovoltaic controller and then control an external power grid to stop supplying power to the home load through the first switching device when the remaining battery capacity is greater than the second preset value and no generated power of 0 exists in generated power at each time within the second preset time period when the current time is a starting point; the second preset value is greater than the first preset value.
5. The photovoltaic energy storage battery management system according to claim 3, wherein the control module is further configured to control the energy storage battery to output electric energy to the first inverter through the battery management module when the remaining battery capacity is greater than the second preset value and when the generated power at each time within the second preset time period when the current time is the starting point is all 0, and then control an external power grid to stop supplying power to the home load through the first switching device.
6. The photovoltaic energy storage battery management system according to claim 5, wherein the control module is further configured to control an external power grid to supply power to the home load through the first switching device when the remaining battery capacity is smaller than the first preset value and when 0 generated power exists in the generated power at each time within the second preset time period when the current time is a starting point, and then control the energy storage battery to stop outputting power to the first inverter through the battery management module.
7. A photovoltaic energy storage cell management system according to claim 2, further comprising a second inverter and a second switching device; the second inverter is electrically connected to the photovoltaic controller, and the second switching device is electrically connected to the second inverter and an external power grid respectively; the second inverter is used for converting direct current from the photovoltaic module into alternating current; the second switching device is used for connecting the output power of the second inverter with an external power grid; the control module is in communication connection with the second switching device.
8. The photovoltaic energy storage battery management system according to claim 7, wherein the control module is further configured to obtain historical weather information of each day in the past first preset time period and corresponding power generation amount of each day, and establish a power generation amount prediction model; the control module is further configured to use historical weather information of each day in the past first preset time period as an input value of the power generation amount prediction model, and use power generation amount of each day in the past first preset time period as an output value to train the power generation amount prediction model, wherein the weather information is any one of cloudy days, rainy days and sunny days;
the control module is further used for obtaining the predicted weather information of each day in the third future preset time period, and inputting the predicted weather information of each day in the third future preset time period into the power generation amount prediction model every other day to obtain the predicted power generation amount of each day in the third future preset time period so as to obtain the predicted total power generation amount of the third future preset time period;
the control module is further used for controlling the energy storage battery to stop outputting electric energy to the first inverter within a third preset time period in the future through the battery management module when the predicted total power generation amount is lower than a third preset value and the residual electric energy value is lower than a fourth preset value; the fourth preset value is greater than the first preset value.
9. The system according to claim 8, wherein the control module is further configured to control the photovoltaic module to charge the energy storage battery through the photovoltaic controller when the predicted total power generation is lower than a third preset value and the remaining power value is lower than a fifth preset value; the fifth preset value is smaller than the fourth preset value.
10. The pv energy storage battery management system according to claim 8, wherein the control module is further configured to control the energy storage battery to output electric energy to the first inverter through the battery management module when the predicted total power generation amount is higher than a sixth preset value and the residual electric energy value is higher than the second preset value, then control the external grid to stop supplying power to the home load through the first switching device, and then control the pv module to be connected to the external grid through the pv controller and the second switching device.
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