CN112952882B - Energy storage conversion system, control method of energy storage conversion system, and computer-readable storage medium - Google Patents
Energy storage conversion system, control method of energy storage conversion system, and computer-readable storage medium Download PDFInfo
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- 238000004146 energy storage Methods 0.000 title claims abstract description 262
- 238000006243 chemical reaction Methods 0.000 title claims abstract description 67
- 238000000034 method Methods 0.000 title claims abstract description 30
- 238000010438 heat treatment Methods 0.000 claims abstract description 193
- 238000010248 power generation Methods 0.000 claims description 46
- 238000004891 communication Methods 0.000 claims description 8
- 230000001960 triggered effect Effects 0.000 claims description 7
- 230000005856 abnormality Effects 0.000 claims description 3
- 238000004590 computer program Methods 0.000 claims description 3
- 230000008901 benefit Effects 0.000 abstract description 4
- 239000000178 monomer Substances 0.000 description 17
- 230000008859 change Effects 0.000 description 12
- 230000005611 electricity Effects 0.000 description 7
- 238000007599 discharging Methods 0.000 description 6
- 230000000712 assembly Effects 0.000 description 5
- 238000000429 assembly Methods 0.000 description 5
- 230000007423 decrease Effects 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 4
- 238000005265 energy consumption Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 230000002457 bidirectional effect Effects 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 238000011217 control strategy Methods 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 230000017525 heat dissipation Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000004378 air conditioning Methods 0.000 description 1
- 230000003750 conditioning effect Effects 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 230000009466 transformation Effects 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
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/61—Types of temperature control
- H01M10/615—Heating or keeping warm
-
- 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
-
- 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
- H02J7/007188—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters
- H02J7/007192—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters in response to temperature
- H02J7/007194—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters in response to temperature of the battery
-
- 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
-
- 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
- H02J2300/28—The renewable source being wind energy
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Secondary Cells (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses an energy storage conversion system, a control method of the energy storage conversion system and a computer readable storage medium, wherein the energy storage conversion system comprises: a battery energy storage assembly; the inversion system is electrically connected with the battery energy storage component through a direct current bus; the inversion system is electrically connected with the battery energy storage component through a direct current bus; the heating device is arranged at the position corresponding to the battery energy storage component, the power supply end of the heating device is electrically connected with the direct current bus, and the heating device is used for heating the battery in the battery energy storage component under the driving of the inversion system. The power supply of the heating device is taken from the DC side bus of the inversion system, so that the energy of a battery system is not consumed, the energy of a power grid is not consumed, and the economic benefit is better.
Description
Technical Field
The present invention relates to the field of electronic circuits, and in particular, to an energy storage conversion system, a control method of the energy storage conversion system, and a computer readable storage medium.
Background
Along with the maturity of technologies such as wind power generation, photovoltaic power generation, the autonomous power generation is also increasingly applied to family, and the electric energy that wind power generation, photovoltaic power generation etc. power generation device produced can put into the electric wire netting, also can store through the battery, is charging to the battery, can be because the environment is abominable, for example when environment temperature is too low, probably the battery is not allowed to charge for the battery can not use.
Disclosure of Invention
The invention mainly aims to provide an energy storage conversion system, a control method of the energy storage conversion system and a computer readable storage medium, and aims to realize heating of a battery energy storage component in the energy storage conversion system.
To achieve the above object, the present invention provides an energy storage conversion system, including:
a battery energy storage assembly;
the inversion system is electrically connected with the battery energy storage component through a direct current bus;
the heating device is arranged at the position corresponding to the battery energy storage component, a power supply end of the heating device is electrically connected with the direct current bus, and the heating device is used for heating the battery in the battery energy storage component under the driving of the inversion system.
Optionally, the energy storage transformation system further comprises:
the electric control assembly is electrically connected with the inversion system, and detects the battery temperature in the battery energy storage assembly when the electric control assembly is triggered to work in a battery charging mode; the method comprises the steps of,
and when the battery temperature is less than or equal to the minimum battery temperature which does not allow charging, controlling the inversion system to supply power to the heating device so as to drive the heating device to heat the battery in the battery energy storage assembly.
Optionally, the electric control assembly is further configured to control the inverter system to charge the battery energy storage assembly when the battery temperature reaches a first preset temperature; wherein the first preset temperature is greater than the minimum battery temperature that does not allow charging.
Optionally, the electric control assembly is further configured to control the inverter system to stop supplying power to the heating device when the battery temperature reaches a second preset temperature; wherein the second preset temperature is greater than the first preset temperature.
Optionally, the electric control assembly is further configured to control the inverter system to resume charging the heating device when the current battery temperature of the battery energy storage assembly is detected to be less than or equal to the first preset temperature after the battery temperature reaches the second preset temperature and the inverter system is controlled to stop supplying power to the heating device.
Optionally, the electric control assembly is further configured to adjust the current output to the heating device in real time according to the detected battery temperature when the battery temperature is between the first preset temperature and the second preset temperature.
Optionally, the electric control component is further configured to detect an electric quantity of the battery energy storage component, and when the electric quantity of the battery energy storage component is detected to be less than or equal to a first preset electric quantity threshold, the electric control component is triggered to work in the battery energy storage mode.
Optionally, the electronic control assembly is further used for detecting an electrical parameter of the heating device and detecting the temperature of the heating device; the method comprises the steps of,
and when the electrical parameter of the heating device and/or the temperature abnormality of the heating device are detected, controlling the heating device to stop working.
Optionally, the energy storage conversion system further comprises a power generation system, and the power generation system is electrically connected with the inversion system;
the electric control assembly is also in communication connection with the inversion system; and when the inversion system detects that the energy of the power generation system has allowance, triggering the electric control assembly to work in a battery energy storage mode.
Optionally, the electronic control assembly includes:
the first switch device is arranged between the battery energy storage component and the inversion system in series;
the second switch device is arranged between the heating device and the inversion system in series; the method comprises the steps of,
the temperature sensor is arranged corresponding to the position of the battery energy storage component and is used for detecting the temperature of the battery in the battery energy storage component;
and the main controller is respectively connected with the temperature sensor and the inversion system and is used for controlling the first switching device and the second switching device to work so as to realize connection and disconnection of the heating device and the battery energy storage component and the inversion system.
Optionally, the electronic control assembly includes:
and the third switching device is arranged between the battery energy storage component and the inversion system in series.
Optionally, the main controller is integrated within the battery energy storage assembly;
alternatively, the main controller is integrated within the inverter system.
Optionally, the electronic control assembly further includes:
an electric control box and an electric control plate accommodated in the electric control box;
the main controller is arranged in the electric control board.
The invention also provides a control method of the energy storage conversion system, which uses the energy storage conversion system, wherein the energy storage conversion system comprises an inversion system, a battery energy storage component and a heating device for heating the battery energy storage component, and is characterized by comprising the following steps:
detecting a battery temperature in the battery energy storage assembly when the energy storage conversion system is operated in a battery charging mode; the method comprises the steps of,
and when the battery temperature is less than or equal to the minimum battery temperature which does not allow charging, controlling the inversion system to supply power to the heating device so as to drive the heating device to heat the battery in the battery energy storage assembly.
Optionally, the step of controlling the inverter system to supply power to the heating device specifically includes:
acquiring the battery electric quantity of the battery energy storage component;
and determining the allowable heating current of the heating device according to the acquired battery electric quantity and the acquired battery temperature of the battery energy storage component, and controlling the inversion system to supply power for the heating device according to the allowable heating current.
The invention also proposes a computer readable storage medium storing a computer program which, when executed by a processor, implements the steps of the control method of an energy storage conversion system as described above.
According to the energy storage conversion system, the battery energy storage component, the inversion system and the heating device arranged at the position corresponding to the battery energy storage component are arranged, the battery energy storage component is electrically connected with the power supply end of the heating device and the direct current bus, and the power supply of the heating device is taken from the direct current side bus of the inversion system, so that the energy of the battery system is not consumed, the energy of a power grid is not consumed, and the economic benefit is better. When the inverter system generates energy and feeds back the power grid, and the temperature of the battery core is lower than the allowable charging temperature, the heating device can be started to heat the battery system, so that energy consumption is saved, and when the electric quantity of the battery energy storage component is insufficient for supplying power, the heating device can be ensured to heat the battery component, so that the battery energy storage component is charged.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a functional module structure of an embodiment of an energy storage conversion system according to the present invention;
FIG. 2 is a schematic circuit diagram of an embodiment of a power conversion system according to the present invention;
FIG. 3 is a flow chart illustrating an embodiment of a control method of the energy storage conversion system of the present invention;
FIG. 4 is a detailed flowchart of the step S200 in FIG. 3;
fig. 5 is a schematic diagram illustrating an embodiment of a battery energy storage assembly in an energy storage conversion system according to the present invention. Reference numerals illustrate:
| reference numerals | Name of the name | Reference numerals | Name of the name |
| 10 | Battery energy storage assembly | 42 | Main controller |
| 20 | Inverter system | 50 | Power generation system |
| 30 | Heating device | K1 | First switch device |
| 40 | Electric control assembly | K2 | Second switching device |
| 41 | Temperature sensor | K3 | Third switching device |
The achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. 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.
It should be noted that, if directional indications (such as up, down, left, right, front, and rear … …) are included in the embodiments of the present invention, the directional indications are merely used to explain the relative positional relationship, movement conditions, etc. between the components in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are correspondingly changed.
In addition, if there is a description of "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present invention.
The term "and/or" is herein merely an association relationship describing an associated object, meaning that there may be three relationships, e.g., a and/or B, may represent: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.
The invention provides an energy storage conversion system which is suitable for a household energy storage conversion system.
The household energy storage change system is generally provided with an inverter system (such as an inverter, a PCS (power system control system) and an energy storage component, the inverter system realizes the charge and discharge of the energy storage component, when energy generated by a photovoltaic cell panel or wind energy and the like is transmitted to a power grid, and after the power grid is saturated, redundant energy generated by the photovoltaic or wind energy and the like can be used for charging a battery. The household energy storage change system adopts a natural heat dissipation thermal management mode, if some battery cores with relatively high requirements on the ambient temperature, such as lithium iron phosphate battery cores, are adopted in the energy storage components in the household energy storage change system, the battery cores are easy to damage when being charged in a low-temperature environment, so that when the energy storage components are charged, the battery is usually required to be charged when the ambient temperature is higher than the minimum battery temperature T0_C (hereinafter referred to as T0_C) which does not allow charging, and therefore, the battery cores are not allowed to be charged when the temperature is lower than T0_C. The battery energy storage component can be normally charged in a warm place (such as an air conditioning room) with the temperature of T0_C or higher. For installation in outdoor and other places, the temperature is low in winter, and the charging cannot be performed. This makes it impossible to charge the battery energy storage assembly with energy even if the photovoltaic or wind energy generated energy is sufficiently high (and the battery energy is not full) when the energy storage system is at an ambient temperature below t0—c C.
Referring to fig. 1 and 2, in one embodiment of the present invention, the energy storage conversion system includes:
a battery energy storage assembly 10;
the inverter system 20 is electrically connected with the battery energy storage assembly 10 through a direct current bus;
the heating device 30 is arranged corresponding to the position of the battery energy storage assembly 10, and a power supply end of the heating device 30 is electrically connected with the direct current bus; the heating device 30 heats the battery in the battery energy storage assembly 10 under the driving of the inverter system 20;
the electric control assembly 40 is electrically connected with the inverter system 20, and when the electric control assembly 40 is triggered to work in a battery charging mode, the electric control assembly 40 detects the battery temperature in the battery energy storage assembly 10; the method comprises the steps of,
and when the battery temperature is less than or equal to the minimum battery temperature which does not allow charging, controlling the inverter system 20 to supply power to the heating device 30 so as to drive the heating device 30 to heat the battery in the battery energy storage assembly 10.
In this embodiment, the battery energy storage assembly 10 includes a housing and a plurality of battery units, and the plurality of battery units can be connected in series, connected in parallel, or connected in series and parallel. The casing is used for holding battery monomer, and the shape of casing can set up according to the quantity, the volume etc. of battery monomer. The electronic control assembly 40 may also be housed in whole or in part within a housing, for example, a master controller in the electronic control assembly 40 is integrated within the housing of the battery energy storage assembly 10. The shell is also provided with a threading hole, a charging and discharging interface and the like, and the battery energy storage assembly 10 can be electrically connected with the inverter system 20 through a copper bar. The charging and discharging interface may be a pluggable connection interface, such as a connection seat, a guide slot, a connection terminal, and the like, and the two ends of the copper bar for connecting the two battery energy storage assemblies 10 and the inverter system 20 may be adapted to the connection seat, the guide slot, and the connection terminal, for example, the two ends may be configured as comb-shaped insertion ends that are inserted and connected to the connection seat of the battery energy storage assemblies 10 and the inverter system 20. It will be appreciated that the number of battery energy storage assemblies 10 may be one or more, for example, when used in a consumer energy storage system, each battery energy storage assembly 10 may be provided with at least one battery energy storage assembly 10.
The energy storage conversion system further comprises a power generation system 50, and the power generation system 50 is electrically connected with the inversion system 20; the power generation system 50 may be one or more of a photovoltaic system, a wind power generation system 50, a hydro-power generation system 50, or a thermal power generation system 50. The power generation system 50 may be connected to the inverter system 20 through a combiner.
The ac side of the inverter system 20 is connected to a grid bus of a utility grid and/or to an electrical load, and the dc side of the inverter system 20 is connected to one or more battery energy storage assemblies 10; the inverter system 20 may include inverters, for example, PCS (Power Convert System, bi-directional energy storage inverter), and the number of the inverters may be set to be plural, and the number of the inverters is equal to the number of the battery energy storage assemblies 10. The power of the power consumption load can be the same power load or different power loads. It can be appreciated that the inverter system 20 can implement ac-dc bidirectional conversion of the electric energy, which can convert the dc stored in the battery energy storage assembly 10 into ac, or convert the dc output by the power generation system 50 into ac and then send the ac to the power grid, or rectify the ac of the power grid into dc to charge the battery in the battery energy storage assembly 10. For example, when the large power grid is normally powered, or there is a surplus of energy in the power generation system 50, or the electric quantity of the battery energy storage component 10 is too low, the inverter system 20 may operate in a charging mode for charging the battery energy storage component 10, and when the large power grid suffers from a fault and power failure, the inverter system 20 may also operate in a discharging mode for supplying the energy discharged by the battery energy storage component 10 to the load through the power grid bus, and may also operate in a standby mode. When charging each battery, each battery energy storage assembly 10 corresponds to a load. And corresponds to a power supply device when the batteries of the respective battery storage modules 10 are discharged. The inverter system 20 may also be provided with a controller, such as a bottom controller and a communication controller, where the communication controller is connected to an electronic control unit 40, a system controller (master control), etc. in the battery energy storage unit 10, such as an energy management system, through a field bus. The underlying controller may control variable flow energy conversion functions, etc. The bottom layer controller can be a control chip such as a DSP, a singlechip and the like. The communication controller CAN realize the communication of dry contact, CAN bus, SPI, etc. The inverter system 20 can complete sampling, conditioning and digitizing given signals such as voltage, current, switching value signals and the like according to hardware equipment configured on the basis of control requirements, collect and rapidly operate digital signals, output PWM signals, switching value output signals and the like, and control corresponding controlled units in real time, such as IGBT control in a bidirectional inverter, switching on/off control of a main circuit breaker and a contactor and the like.
It should be noted that, although the peak clipping and valley filling mode takes electricity from the power grid to heat the battery and charges the battery energy storage component 10, the heating battery needs to consume a certain amount of electricity at this time, under a special working condition, the household energy storage system with a photovoltaic panel or wind energy may need to start the possibility of taking electricity from the power grid to heat the battery and charge the battery energy storage component 10 (such as the situation that emergency power supply from the power grid is forced when the battery is in a shortage). It should be noted that, in order to achieve that the battery energy storage assembly 10 can be charged with the excessive energy, the temperature of the battery cells of the battery energy storage assembly 10 needs to be heated to a temperature range in which the battery cells can be charged.
In this embodiment, the triggering condition of the battery energy storage mode may be that the battery self-power is too low, or that the power generation system 50 self-power is surplus, specifically, the electronic control component 40 is further configured to detect the power of the battery energy storage component 10, and when detecting that the power of the battery energy storage component 10 is less than or equal to the first preset power threshold, the electronic control component 40 is triggered to operate in the battery energy storage mode.
The electric control assembly 40 is also in communication connection with the inverter system 20; the inverter system 20 triggers the electronic control assembly 40 to operate in the battery energy storage mode when it detects that there is a margin in the energy of the power generation system 50.
The heating device 30 may be implemented by using heating elements such as a heating film and a resistance wire, and the heating device 30 may be disposed in a housing of the battery energy storage assembly 10, specifically may be attached to an inner side of the housing, and may be directly or indirectly disposed near a battery cell in the battery energy storage assembly 10. When the battery cell needs to be heated, the electric control assembly 40 can control the inverter system 20 to supply power to the heating device 30, so as to control the heating device 30 to work, and further heat the battery cell to a temperature above the minimum temperature for allowing charging. In this embodiment, the power supplied from the heating device 30 is output via the inverter system 20, and specifically may be energy delivered by the power generation system 50 or energy delivered by a power grid. For example, when there is a surplus of energy in the power generation system 50, the inverter system 20 performs dc conversion on the energy output by the power generation system 50 to store in the battery energy storage assembly 10, or when the electric quantity of the battery energy storage assembly 10 is too low and needs to be charged, the battery energy storage assembly 10 may be transported by the power generation system 50 or may be transported by the power grid. In this embodiment, the power generation system 50 is preferably used for power transmission, but the power transmission from the power generation system is not satisfied at the same time when the power is insufficient, and the emergency power supply from the power grid is required to be forced, for example, the energy of the photovoltaic power generation system 50 is too low in overcast and rainy weather or at night, so that the power generation system 50 can also be used for power transmission under the condition of not transmitting energy. It will also be appreciated that the supply voltage of the circuit modules in the electronic control assembly 40 is also output by the inverter system 20, which may reduce the power consumption of the battery energy storage assembly 10 itself. The heating of the battery energy storage and storage assembly 10 by the heating device 30 may be achieved based on temperature detection, or when the battery energy storage and storage assembly 10 works in a severe environment for a long time, the heating of the battery energy storage and storage assembly 10 by the heating device 30 may be controlled for a certain time before the battery energy storage and storage assembly 10 starts to be charged. The operation trigger condition of the heating device 30 may be set according to practical applications, and is not limited herein.
In the electric control assembly 40, a temperature sensor 41 may be provided, where the temperature sensor 41 may be disposed corresponding to a battery cell to detect a temperature of the battery cell, and the temperature sensor 41 may detect the temperature of the battery cell in real time, for example, in a charging/discharging process of the battery energy storage assembly 10, so as to monitor the temperature of the battery cell. The electronic control unit 40 is further provided with a control unit and a switch, such as a circuit breaker, a relay, etc., for controlling on/off of the inverter system 20 and the battery storage assembly 10, and for controlling on/off of the inverter system 20 and the heating device 30. The working state of the heating device 30 can be controlled by controlling the on-off of the switch. When the battery cells in the battery energy storage assembly 10 need to be charged, the electric control assembly 40 may detect the current temperature of the battery cells, that is, the battery temperature, through the temperature sensor 41, and when detecting that the current temperature of the battery cells is less than or equal to the minimum battery temperature that is not allowed to be charged, control the inverter system 20 to be electrically connected with the heating device 30, so that the inverter system 20 supplies power to the heating device 30, thereby heating the battery cells. When the battery energy storage assembly 10 needs to be heated, the battery temperature of the battery monomer can be obtained first, and when the current temperature of the battery monomer is detected to be higher than the minimum battery temperature which does not allow charging, the inverter system 20 can be controlled to be directly electrically connected with the battery energy storage without controlling the inverter system 20 to supply power to the heating device 30, namely, the battery monomer does not need to be heated in the current environment. When the current temperature of the battery cell is detected to be less than or equal to the minimum battery temperature which does not allow charging, the inverter system 20 and the heating device 30 can be controlled to be electrically connected, so that the inverter system 20 supplies power to the heating device 30 to heat the battery cell until the battery temperature of the battery cell allows charging of the battery cell without affecting the normal charging of the battery cell.
According to the energy storage conversion system, the battery energy storage assembly 10, the inversion system 20 and the heating device 30 which is arranged at the position corresponding to the battery energy storage assembly 10 are arranged, the power supply ends of the battery energy storage assembly 10 and the heating device 30 are electrically connected with the direct current bus, and the power supply of the heating device 30 is taken from the direct current side bus of the inversion system 20, so that the energy of the battery system is not consumed, the energy of a power grid is not consumed, and the economic benefit is better. When the inverter system 20 generates energy to feed back to the power grid and the temperature of the battery core is lower than the allowable charging temperature, the heating device 30 is started to heat the battery system, so that energy consumption is saved, and when the electric quantity of the battery energy storage component 10 is insufficient to supply power, the heating device 30 can be ensured to heat the battery component, so that the battery energy storage component 10 is charged.
The invention is also provided with an electric control assembly 40 electrically connected with the inverter system 20, and the electric control assembly 40 detects the battery temperature in the battery energy storage assembly 10 when triggered to work in a battery charging mode; and controlling the inverter system 20 to supply power to the heating device 30 to drive the heating device 30 to heat the battery in the battery energy storage assembly 10 when the battery temperature is less than or equal to the minimum battery temperature at which charging is not allowed.
Referring to fig. 1 and 2, in an embodiment, the electronic control unit 40 is further configured to control the inverter system 20 to charge the battery energy storage unit 10 when the battery temperature reaches a first preset temperature; wherein the first preset temperature is greater than the minimum battery temperature that does not allow charging.
In this embodiment, the first preset temperature may be set according to an environment where the battery energy storage system is located, specifically may be set according to a season, a geographical location, a daytime temperature change, a nighttime temperature change, etc., for example, the first preset temperature may be set differently in winter and summer, may be set differently in daytime and nighttime, may be set differently in a place with a higher latitude and a place with a lower latitude, and may be set differently in a place with a higher altitude and a place with a lower altitude. In practical applications, to reduce the waiting time for battery charging and increase the charging speed of the battery energy storage assembly 10, the first preset temperature may be set to a value slightly higher than the minimum battery temperature at which charging is not allowed. In order to avoid the influence of the too low temperature on the performance of the battery, the first preset temperature may also be a temperature for ensuring the optimal charging of the battery, and may be specifically set according to actual requirements.
In the above embodiment, when the battery energy storage assembly 10 is controlled to be charged, the electric control assembly 40 is in communication connection with the inverter system 20, and outputs the charging voltage, the charging current, etc. of the battery energy storage assembly 10 to the inverter system 20, so as to realize the charging control of the battery energy storage assembly 10. Meanwhile, the working current, the working time length, the power supply frequency and the like of the heating device 30 can be calculated according to the residual capacity, the required charging voltage, the charging current and the like of the battery energy storage component 10. That is, in the process of controlling the operation of the heating device 30, the power of the heating device 30 can be adjusted in real time according to the change of the residual electric quantity of the battery energy storage assembly 10, the charging time, the charging stages of the batteries, and the like, so that the rapid heating of the batteries is realized, and meanwhile, the power consumption caused by the operation of the heating device 30 is reduced, thereby realizing energy conservation and emission reduction.
Referring to fig. 1 and 2, in an embodiment, the electronic control unit 40 is further configured to control the inverter system 20 to stop supplying power to the heating device 30 when the battery temperature reaches a second preset temperature; wherein the second preset temperature is greater than the first preset temperature.
In this embodiment, the second preset temperature may be set according to an environment where the battery energy storage system is located, specifically may be set according to a season, a geographical location, a daytime temperature change, a nighttime temperature change, etc., for example, the second preset temperature may be set differently in winter and summer, may be set differently in daytime and nighttime, may be set differently in a place with a higher latitude and a place with a lower latitude, and may be set differently in a place with a higher altitude and a place with a lower altitude. It can be appreciated that the heating device 30 needs to consume electric energy when working, and in practical application, in order to reduce the electric energy consumption of the heating device 30, realize energy saving and emission reduction, reduce the power consumption of the energy storage conversion system, and the second preset temperature can be set to a temperature slightly ensuring the optimal state of battery charging. Meanwhile, in order to avoid the situation that the temperature is too high, the heat dissipation of the battery is not timely, the normal charging of the battery is affected, the second preset temperature can be the temperature for guaranteeing the optimal state of battery charging, or the second preset temperature can be a temperature value for guaranteeing that the temperature of the battery is not lower than the first preset temperature or the minimum temperature for Xu Dianchi charging even if the temperature of the battery is reduced in the process of charging until the battery is full, and the battery charging device is particularly set according to actual requirements.
Referring to fig. 1 and 2, in an embodiment, the electronic control unit 40 is further configured to control the inverter system 20 to resume charging of the heating device 30 when the current battery temperature of the battery energy storage unit 10 is detected to be less than or equal to the first preset temperature after the battery temperature reaches the second preset temperature and the inverter system 20 is controlled to stop supplying power to the heating device 30.
It will be appreciated that when the battery energy storage assembly 10 is used in a relatively harsh environment, such as a temperature environment below-40 ℃, after the battery of the battery energy storage assembly 10 is heated to the second preset temperature and the heating device 30 is controlled to stop heating, the battery of the battery energy storage assembly 10 may drop too quickly due to too low environmental temperature, for example, after one heating, if the battery temperature drops to the minimum temperature that does not allow the battery to be charged, the charging of the battery may be affected. Meanwhile, if the battery is continuously heated, the power consumption of the energy storage conversion system can be increased, and even the risk of damage to the battery due to overhigh temperature exists. In this embodiment, the battery temperature may be maintained between the first preset temperature and the second preset temperature, that is, when the battery temperature is less than or equal to the first preset temperature, the heating device 30 is controlled to resume heating, and when the heated battery temperature is greater than or equal to the second preset temperature, the heating is stopped again, and the operation is repeated until the electric energy of the battery energy storage component 10 is full.
It should be noted that the increase of the battery temperature may be a non-linear increase, and there is a certain hysteresis in the temperature control of the heating device 30, for example, when the current temperature of the battery is increased to the second preset temperature during heating, the heating device 30 is controlled to stop working, at this time, the temperature of the heating device 30 will not suddenly decrease, and the residual temperature of the heating device 30 may continue to heat the battery, so that the battery temperature increases and is higher than the second preset temperature. Similarly, after stopping adding, when the temperature of the battery decreases along with the influence of the ambient temperature, if the temperature of the battery decreases to the second preset temperature, the heating device 30 is controlled to start working, at this time, the temperature of the heating device 30 will not suddenly increase, the temperature of the heating device 30 is lower than the first preset temperature, and the heating device 30 needs a certain time to preheat, so that the battery can be heated, and therefore, the temperature of the battery will continue to decrease, resulting in the actual temperature of the battery being lower than the first preset temperature.
Referring to fig. 1 and 2, in order to avoid continuous decrease of the battery temperature or continuous increase of the battery temperature, the electronic control unit 40 of the present embodiment is further configured to adjust the current output to the heating device 30 in real time according to the detected battery temperature when the battery temperature is detected to be between the first preset temperature and the second preset temperature.
Specifically, when the battery temperature is between the first preset temperature and the second preset temperature, the current of the heating device 30 is adjusted from large to small, that is, when the battery temperature is close to the first preset temperature, the heating device 30 is controlled to heat the battery by using a larger current, so that the power of the heating device 30 is increased, the battery temperature can quickly reach a better temperature suitable for charging, and when the battery temperature is close to the second preset temperature, the heating device 30 is controlled to heat the battery by using a smaller current, so that the power of the heating device 30 is reduced, and the battery reaches the second preset temperature at a slow speed. Of course, in other embodiments, the intermittent operation of the heating device 30 may also be controlled, for example, when the battery temperature is between the first preset temperature and the second preset temperature, the heating device 30 is controlled to stop heating for a certain period of time after heating for a certain period of time, and the heating time and the heating stopping time are adjusted in real time according to the battery temperature, so that the temperature of the battery is maintained at the first preset temperature and the second preset temperature.
In other embodiments, the electronic control assembly 40 is further configured to detect an electrical parameter of the heating device 30, and to detect a temperature of the heating device; the method comprises the steps of,
When an electrical parameter of the heating device 30 and/or a temperature abnormality of the heating device 30 is detected, the heating device 30 is controlled to stop working.
In this embodiment, the electric control assembly 40 may further be provided with a temperature sensor 41 for detecting the temperature of the heating device 30, and the electric control assembly 40 monitors electrical parameters of the heating device 30, such as power supply voltage (UP, UH), current (IH), and the like, and the Temperature (TH) of the heating device 30 during the operation of the heating device 30, and can control the heating device 30 to stop operating when the heating device 30 is abnormal, such as over-current, over-voltage, and over-temperature, so as to control and protect the heating device 30. It will be appreciated that in another embodiment, the current value required by the heating device 30 at each moment may be calculated according to the current environment, the battery capacity, the current electric quantity of the battery, and the like, and a corresponding control strategy may be generated, so as to control the operation of the heating device 30 according to the generated control strategy. The current environment may be a factor affecting the battery temperature, such as the current ambient temperature, latitude, altitude, etc.
It will be further appreciated that in other embodiments, in an initial stage of heating the battery, that is, when the battery temperature is detected to be less than or equal to the minimum battery temperature that is not allowed to be charged, and the inverter system 20 is controlled to supply power to the heating device 30, the inverter system 20 may be controlled to take full power as the heating device 30, so that the heating device 30 can heat the battery to the first preset temperature more quickly, and then the current of the heating device 30 is continued or reduced, so that the battery temperature can be slowly increased and maintained within a stable range.
Referring to fig. 1 and 2, in one embodiment, the electronic control assembly 40 includes:
the first switching device K1 is disposed in series between the battery energy storage assembly 10 and the inverter system 20;
a second switching device K2 disposed in series between the heating device 30 and the inverter system 20; the method comprises the steps of,
a temperature sensor 41, disposed corresponding to the position of the battery energy storage assembly 10, for detecting the battery temperature in the battery energy storage assembly 10;
the main controller 42 is respectively connected with the temperature sensor 41 and the inverter system 20, and the main controller 42 is used for controlling the first switching device K1 and the second switching device K2 to work so as to realize connection and disconnection between the heating device 30 and the battery energy storage assembly 10 and the inverter system 20.
In this embodiment, the main controller 42 is integrated into the battery energy storage assembly;
alternatively, the main controller 42 is integrated within the inverter system 20.
Alternatively, the electronic control assembly 40 further includes:
an electric control box and an electric control plate accommodated in the electric control box;
the main controller 42 is disposed in the electronic control board.
The first switching device K1 and the second switching device K2 may be switches such as a relay, a circuit breaker, and a dc contactor, where the first switching device K1 is used to control on/off between the battery energy storage assembly 10 and the inverter system 20, and the second switching device K2 is used to control on/off between the heating device 30 and the inverter system 20. The temperature sensor 41 may be a device capable of detecting temperature, such as a thermistor or a thermocouple, and the temperature sensor 41 may be disposed on the battery, for example, near the battery cell, or may be disposed on the housing of the battery energy storage assembly 10. The main controller 42 may be a complete machine controller of the energy storage conversion system, or may be a controller in the battery energy storage assembly 10, where the control of the battery heating device 30 and the charge and discharge of the battery system are jointly implemented by the inverter system 20 and the battery energy storage system, without an additional control device, and the energy consumption information of the heating device 30 may be recorded and calculated. The main controller 42 can be implemented by a single-chip microcomputer, a PLC, DSP, FPGA microprocessor, etc., and various interfaces and circuits can be utilized in the main controller 42 to connect various parts of the whole energy storage conversion system, and various functions and processing data of the energy storage conversion system can be executed by running or executing stored software programs and/or modules and calling stored data, so that the whole energy storage conversion system is monitored. Of course, in other embodiments, the main controller 42 may be disposed independently of the battery energy storage assembly 10 and the inverter system 20, for example, the main controller 42 may be disposed on an electric control board of the electric control box, and the first switch device K1 and the second switch device K2 may also be disposed on the electric control board, which is not limited herein.
It will be appreciated that in the above embodiment, a third switching device K3 is further disposed between the battery energy storage assembly 10 and the inverter system 20, and the third switching device K3 may be a manual switch, and a user may control the battery energy storage assembly 10 to be connected to the inverter system 20 or disconnected from the inverter system 20 based on the third switching device K3.
Referring to fig. 5, during the operation of the battery energy storage assembly 10, for example, when the third switching device K3 is closed, when the battery energy storage assembly 10 is connected to the inverter system 20, the energy storage conversion system may be self-checked, specifically, the ambient temperature detected by the temperature sensor 41 may be obtained before the power-on operation, whether the temperature sensor 41 is faulty or not is determined according to the obtained ambient temperature and the preset temperature, and a handshake signal may be sent to the inverter system 20 to determine whether a fault occurs between the battery energy storage assembly and the inverter system 20. And detecting whether adhesion or the like occurs between the first switching device K1 and the second switching device K2. When the self-checking is finished and each parameter of the energy storage conversion system is normal, the battery energy storage component 10 can be controlled to charge/discharge according to the control instruction. And before charging the battery, if it is determined from the battery temperature detected by the temperature sensor 41 that the battery temperature is lower than the minimum temperature t0_c where charging is not allowed, the heating device 30 is activated, thereby heating the battery storage assembly 10. When the temperature of the battery is heated to allow charging, a current value it_c (it_c=ib_c+ih=ub/RH, ib_c is an allowable current value corresponding to the battery energy storage component 10) that is allowed to be charged is sent to the inverter system 20, the inverter system 20 controls the dc side output current, the system detects the IC in real time (ib_c is not exceeded), and the system adjusts the value it_c sent to the inverter system 20 in real time according to the conditions of the actual battery temperature, SOC, and the like. When the battery energy storage assembly 10 is required to discharge, the first switching device K1 may also be controlled to be turned on, the battery energy storage assembly 10 may output electric energy to the load through the inverter system 20, and after the discharging is completed, the first switching device K1 is controlled to be turned off. A first current detection resistor R1 is provided between the battery energy storage assembly 10 and the inverter system 20 for detecting a current flowing through the battery energy storage assembly. A second current detection resistor R2 is provided between the heating device 30 and the inverter system 20 for detecting a current flowing through the heating device 30.
The invention also provides a control method of the energy storage conversion system, which uses the energy storage conversion system, wherein the energy storage conversion system comprises an inversion system, a battery energy storage component and a heating device for heating the battery energy storage component, and referring to fig. 3, the control method of the energy storage conversion system comprises the following steps:
step S100, when the energy storage conversion system works in a battery charging mode, detecting the battery temperature in the battery energy storage component; the method comprises the steps of,
and step 200, when the battery temperature is less than or equal to the minimum battery temperature which does not allow charging, controlling the inverter system to supply power to the heating device so as to drive the heating device to heat the battery in the battery energy storage assembly.
In this embodiment, the inverter system may implement ac-dc bidirectional conversion of the electric energy, which may invert the dc stored in the battery energy storage assembly into ac, or invert the dc output by the power generation system into ac and then send the ac to the power grid, or rectify the ac of the power grid into dc to charge the battery in the battery energy storage assembly. For example, when the large power grid supplies power normally, or the power generation system has energy surplus, or the electric quantity of the battery energy storage component is too low, the inverter system can work in a charging mode for charging the battery energy storage component, and when the large power grid suffers from a fault and power failure, the inverter system can also work in a discharging mode for supplying power discharged by the battery energy storage component to a load through a power grid bus, and can also work in a standby mode. When charging each battery, each battery energy storage assembly corresponds to a load.
Although the peak clipping and valley filling mode is adopted to take electricity from the power grid to heat the battery and charge the battery energy storage component, the battery needs to consume a certain amount of electricity at the moment, the household energy storage system with a photovoltaic panel or wind energy and the like can also need to start the possibility of taking electricity from the power grid to heat the battery and charge the battery energy storage component under special working conditions (such as the situation that emergency power supply from the power grid is forced when the battery is in power shortage). It should be noted that, if the battery energy storage component is to be charged with the excessive energy, the temperature of the battery cell of the battery energy storage component needs to be heated to a temperature range in which the battery cell can be charged.
In this embodiment, the triggering condition of the battery energy storage mode may be that the electric quantity of the battery is too low, or that the energy of the power generation system is surplus, specifically, the electric control component is further configured to detect the electric quantity of the battery energy storage component, and when it is detected that the electric quantity of the battery energy storage component is less than or equal to a first preset electric quantity threshold, the energy storage conversion system works in the battery energy storage mode. Or when the energy of the power generation system is detected to have the allowance, the energy storage conversion system works in a battery energy storage mode.
When the battery monomer is required to be heated, the inversion system can be controlled to supply power to the heating device, so that the heating device is controlled to work, and the temperature of the battery monomer is heated to be higher than the minimum temperature allowed to be charged. In this embodiment, the power supplied by the heating device is output via the inverter system, which may specifically be energy delivered by the power generation system or energy delivered by the power grid. For example, when the energy of the power generation system is surplus, the inverter system performs direct current conversion on the energy output by the power generation system and stores the energy in the battery energy storage component, or when the electric quantity of the battery energy storage component is too low and needs to be charged, the battery energy storage component can be conveyed by the power generation system or a power grid. In this embodiment, the power generation system is preferably used for power generation, and of course, when the battery is deficient, the emergency power supply of the charging grid is required to be forced, for example, the energy of the photovoltaic power generation system is too low in overcast and rainy weather or at night, so that the power generation system can also be used for power grid transmission under the condition that the power generation system does not transmit energy. It is also understood that the supply voltage of the circuit module in question is also output by the inverter system.
The working state of the heating device can be controlled by controlling the on-off of the electric connection between the inversion system and the heating device. When the battery monomer in the battery energy storage component needs to be charged, the current temperature of the battery monomer, namely the battery temperature, can be detected through the temperature sensor, and when the current temperature of the battery monomer is detected to be smaller than or equal to the minimum battery temperature which does not allow charging, the inverter system is controlled to be electrically connected with the heating device, so that the inverter system supplies power for the heating device, and the battery monomer is heated. When the battery energy storage component is required to be heated, the battery temperature of the battery monomer can be obtained firstly, and when the current temperature of the battery monomer is detected to be larger than the minimum battery temperature which is not allowed to be charged, the inversion system can be controlled to be directly electrically connected with the battery energy storage, and the inversion system is not required to be controlled to supply power for the heating device, namely, the battery monomer is not required to be heated in the current environment. When the current temperature of the battery monomer is detected to be smaller than or equal to the minimum battery temperature which is not allowed to be charged, the inverter system and the heating device can be controlled to be electrically connected, so that the inverter system supplies power to the heating device, and the battery monomer is heated until the battery temperature of the battery monomer allows the battery to be charged, and normal charging of the battery is not affected.
Referring to fig. 4, in an embodiment, the step of controlling the inverter system to supply power to the heating device specifically includes:
step S210, acquiring the battery electric quantity of the battery energy storage component;
step S220, determining allowable heating current of the heating device according to the acquired battery electric quantity and the battery temperature of the battery energy storage component, and controlling the inversion system to supply power for the heating device by using the allowable heating current. The allowable heating current may be a maximum power of the heating device when the battery energy storage component is heated to a chargeable temperature at the fastest speed, for example, the first preset temperature value. The allowable heating current may be a dynamic value or a fixed value, and may be specifically set according to practical applications, for example, may be set according to an environment where the battery energy storage system is located, and may be specifically set according to a season where the battery energy storage system is located, a geographic location, a daytime temperature change, a nighttime temperature change, and the like, for example, the second preset temperature may be set differently in winter and summer, may be set differently in daytime and nighttime, may be set differently in places with higher latitude and places with lower latitude, and may be set differently in places with higher altitude and places with lower altitude.
In the foregoing embodiment, when the battery temperature reaches the first preset temperature, the inverter system may be controlled to charge the battery energy storage component.
When the energy storage conversion system works in a grid-connected operation state, electric energy generated by the power generation system is transmitted to a power grid through the inversion system; when the generating capacity of the generating system is abundant, the power grid is saturated, the redundant electric quantity generated by the generating system can be transmitted to the battery energy storage system through the inversion system, at the moment, the state information of the respective systems is interacted to the other side between the main controller in the electric control assembly and the inversion system, and when the energy generated by the generating system is transmitted to the power grid, the surplus energy remains, and the charging process of the battery energy storage assembly and the heating device is specifically described by combining the hardware structure.
When the battery temperature is determined to be lower than the minimum temperature T0-C ℃ which does not allow charging according to the battery temperature detected by the temperature sensor, the electric control component sends an allowable charging voltage value UB (the voltage value keeps consistent with the change of the battery voltage) and an allowable charging current value (IT_C=IH, wherein IH=UB/RH) to the inverter system, meanwhile, the second switching device is controlled to be closed, the first switching device is controlled to be opened, the direct-current side output voltage UP of the inverter system is controlled to be equal to UB, and the heating device is started, so that the battery energy storage component is heated.
When the temperature of the battery is heated to be higher than a first preset temperature (the first preset temperature can be set to be slightly higher than the minimum temperature T0_C which does not allow charging), the first switching device is controlled to be closed, a current value IT_C which allows charging (IT_C=IB_C+IH, wherein IH=UB/RH, IB_C is the allowed current value corresponding to the battery energy storage component) is sent to the inversion system, the inversion system controls the direct current side to output current, the system can detect IC (IB_C cannot be exceeded) in real time, and the system adjusts the IT_C value sent to the inversion system in real time according to the conditions of actual battery temperature, SOC and the like.
When the battery system is heated to a condition triggering the heating device to be turned off, the system controls the second switching device to be turned off, and the battery can still be continuously charged (at the moment, a current value IT_C=IB_C for allowing charging is obtained, wherein IB_C is a current value corresponding to the battery energy storage component and is sent to the inversion system), and the charging instruction is stopped.
When no electric energy is generated by the power generation system and the battery system is in low electric quantity and needs emergency charging, the inverter system is required to take electricity from the 401 electric network at this time, and energy is converted and transmitted to the battery energy storage component (comprising the heating device).
When the battery temperature is lower than t0_c ℃, an allowable charge voltage value UB (the voltage value keeps consistent with the change of the battery voltage) and an allowable charge current value (it_c=ih, where ih=ub/RH) are sent to the inverter system, the system controls the second switching device to be closed, controls the first switching device to be opened, and the inverter system outputs a voltage UP on the direct current side after taking power from 401 (UP control and UB are equal).
When the temperature of the battery is heated to be higher than T0_C ℃, the battery can be charged, the first switching device is controlled to be attracted, a current value IT_C allowing charging (IT_C=IB_C+IH, wherein IH=UB/RH, IB_C is an allowed current value corresponding to charging MAP) is sent to the inversion system, the inversion system controls the direct-current side to output current, the system can detect IC (IB_C cannot be exceeded) in real time, and the system adjusts the IT_C value sent to the inversion system in real time according to the conditions of actual battery cell temperature, SOC and the like;
when the battery system is heated to a condition triggering the heating device to be turned off, the system controls the second switching device k2 to be turned off, and the battery can still be continuously charged (at this time, a current value it_c=ib_c for allowing charging, wherein ib_c is a current value corresponding to the charging MAP and is sent to the inverter system), until a charging instruction stops. Wherein t0_c is the minimum battery temperature at which charging is not allowed; RH is the resistance of the heating device; the IB_C battery core charges the corresponding current of the map under each working condition; the current actually corresponding to the IC battery core is charged; the IB_F battery core discharges the current corresponding to the map under each working condition; IH is a heating device current allowed value (ih=ub/RH); it_c is a current value (it_c=ib_c+ih) allowed by the battery system to transmit to the inverter system.
The invention also includes a computer readable storage medium storing a computer program which, when executed by a processor, implements the steps of the method of controlling an energy storage conversion system as described above.
The foregoing description is only of the optional embodiments of the present invention, and is not intended to limit the scope of the invention, and all the equivalent structural changes made by the description of the present invention and the accompanying drawings or the direct/indirect application in other related technical fields are included in the scope of the invention.
Claims (12)
1. An energy storage conversion system, the energy storage conversion system comprising:
a battery energy storage assembly;
the inversion system is electrically connected with the battery energy storage component through a direct current bus;
the heating device is arranged at a position corresponding to the battery energy storage component, a power supply end of the heating device is electrically connected with the direct current bus, and the heating device is used for heating the battery in the battery energy storage component under the drive of the inversion system;
electric control assembly ， Is electrically connected with the inversion system, and the electric control groupWhen the battery is triggered to work in a battery charging mode, detecting the battery temperature in the battery energy storage component, and controlling the inversion system to supply power to the heating device when the battery temperature is less than or equal to the minimum battery temperature which does not allow charging so as to drive the heating device to heat the battery in the battery energy storage component;
The electric control assembly is further used for controlling the inversion system to charge the battery energy storage assembly when the battery temperature reaches a first preset temperature, and the first preset temperature is greater than the minimum battery temperature which does not allow charging;
the electric control assembly is further used for controlling the inversion system to stop supplying power to the heating device when the temperature of the battery reaches a second preset temperature, and the second preset temperature is higher than the first preset temperature;
the electric control assembly is further used for adjusting the current output to the heating device in real time according to the detected battery temperature when the battery temperature is between the first preset temperature and the second preset temperature, and adjusting the heating time and the heating stopping time in real time according to the detected battery temperature so that the temperature of the battery is maintained between the first preset temperature and the second preset temperature.
2. The energy storage conversion system according to claim 1 wherein the electronic control assembly is further configured to control the inverter system to resume power to the heating device upon detecting that the current battery temperature of the battery energy storage assembly is less than or equal to the first preset temperature after the battery temperature reaches a second preset temperature and the inverter system is controlled to stop power to the heating device.
3. The energy storage conversion system according to claim 1, wherein the electronic control assembly is further configured to detect an electrical quantity of the battery energy storage assembly, and the electronic control assembly is triggered to operate in the battery energy storage mode when the electrical quantity of the battery energy storage assembly is detected to be less than or equal to a first preset electrical quantity threshold.
4. The energy storage conversion system of claim 1, wherein the electronic control assembly is further configured to detect an electrical parameter of the heating device and to detect a temperature of the heating device; the method comprises the steps of,
and when the electrical parameter of the heating device and/or the temperature abnormality of the heating device are detected, controlling the heating device to stop working.
5. The energy storage conversion system of claim 1, further comprising a power generation system electrically connected to the inverter system;
the electric control assembly is also in communication connection with the inversion system; and when the inversion system detects that the energy of the power generation system has allowance, triggering the electric control assembly to work in a battery energy storage mode.
6. The energy storage conversion system according to any one of claims 1 to 5 wherein the electronic control assembly comprises:
The first switch device is arranged between the battery energy storage component and the inversion system in series;
the second switch device is arranged between the heating device and the inversion system in series; the method comprises the steps of,
the temperature sensor is arranged corresponding to the position of the battery energy storage component and is used for detecting the temperature of the battery in the battery energy storage component;
and the main controller is respectively connected with the temperature sensor and the inversion system and is used for controlling the first switching device and the second switching device to work so as to realize connection and disconnection of the heating device and the battery energy storage component and the inversion system.
7. The energy storage conversion system of claim 6, wherein the electronic control assembly comprises:
and the third switching device is arranged between the battery energy storage component and the inversion system in series.
8. The energy storage conversion system of claim 6, wherein the master controller is integrated within the battery energy storage assembly;
alternatively, the main controller is integrated within the inverter system.
9. The energy storage conversion system of claim 6, wherein the electronic control assembly further comprises:
An electric control box and an electric control plate accommodated in the electric control box;
the main controller is arranged in the electric control board.
10. A control method of an energy storage conversion system using the energy storage conversion system according to any one of claims 1 to 9, the energy storage conversion system including an inverter system, a battery energy storage assembly, and a heating device for heating the battery energy storage assembly, characterized in that the control method of the energy storage conversion system includes the steps of:
detecting a battery temperature in the battery energy storage assembly when the energy storage conversion system is operated in a battery charging mode; the method comprises the steps of,
and when the battery temperature is less than or equal to the minimum battery temperature which does not allow charging, controlling the inversion system to supply power to the heating device so as to drive the heating device to heat the battery in the battery energy storage assembly.
11. The method of claim 10, wherein the step of controlling the inverter system to supply power to the heating device specifically comprises:
acquiring the battery electric quantity of the battery energy storage component;
and determining the allowable heating current of the heating device according to the acquired battery electric quantity and the acquired battery temperature of the battery energy storage component, and controlling the inversion system to supply power for the heating device according to the allowable heating current.
12. A computer-readable storage medium, characterized in that the computer-readable storage medium stores a computer program which, when executed by a processor, implements the steps of the method of controlling an energy storage conversion system according to any one of claims 10 to 11.
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