CN116388248A - Outdoor energy storage system and method for achieving grid-connected and grid-disconnected functions - Google Patents
Outdoor energy storage system and method for achieving grid-connected and grid-disconnected functions Download PDFInfo
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- CN116388248A CN116388248A CN202310405782.6A CN202310405782A CN116388248A CN 116388248 A CN116388248 A CN 116388248A CN 202310405782 A CN202310405782 A CN 202310405782A CN 116388248 A CN116388248 A CN 116388248A
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- 238000004146 energy storage Methods 0.000 title claims abstract description 197
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- 230000005611 electricity Effects 0.000 claims abstract description 4
- 238000004891 communication Methods 0.000 claims description 9
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- 238000010586 diagram Methods 0.000 description 10
- 239000007788 liquid Substances 0.000 description 10
- 238000001816 cooling Methods 0.000 description 8
- 238000009434 installation Methods 0.000 description 4
- 238000004590 computer program Methods 0.000 description 2
- 239000012809 cooling fluid Substances 0.000 description 2
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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
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/062—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for AC powered loads
Abstract
The application discloses an outdoor energy storage system and method for realizing grid-connected function, the system includes energy storage converter, group battery, first switch, first switching power module, direct current contactor, battery, second switch, second switching power module and management module. Through parts such as first switching power supply module, direct current contactor and battery that add, can realize from the switching between the grid-connected function and the grid-connected mode, and can effectively avoid the unable normal work defect that the commercial power loses the electricity and lead to, improve outdoor energy storage overall efficiency when reducing input cost.
Description
Technical Field
The application belongs to the technical field of energy storage cabinets, and particularly relates to an outdoor energy storage system and method for achieving grid-connected and off-grid functions.
Background
Along with the large-scale development and utilization of new energy and the higher and higher requirements of people on the diversity and reliability of electric energy, each link from production to consumption of electric power is undergoing profound changes. The energy storage technology and the energy storage system break the bottleneck of real-time balance of electric power in the traditional electric power system, obviously enhance the flexibility of the electric power system, and with the increase of electric power demand, the existing electric power can not meet the daily life demand of residents sometimes, so that the outdoor energy storage cabinet with small volume, high mobility and strong function is generated.
However, in some existing outdoor energy storage systems, the system can normally work when the utility power is externally connected, and cannot normally work once the utility power is lost in the city, so that the grid-connected function can be realized; and secondly, some outdoor energy storage systems are additionally provided with equipment with too high price, so that the overall input cost is increased, and risks of compact installation layout, failure of electrical connection points and the like are introduced.
Disclosure of Invention
The method and the device can work normally only when the external commercial power is connected, and can not work normally once the power is lost in the city, so that the grid-connected function can be realized only; secondly, some outdoor energy storage systems are additionally provided with equipment with excessively high price, so that the overall input cost is increased, risks of compact installation layout, failure of electrical connection points and the like are introduced, and the outdoor energy storage system and the method for realizing the grid-connected function are provided, and the technical scheme is as follows:
in a first aspect, an embodiment of the present application provides an outdoor energy storage system for implementing a grid-connected function, including an energy storage converter, a battery pack, a first switch, a first switching power module, a dc contactor, a storage battery, a second switch, a second switching power module, and a management module, wherein:
the first group of interfaces of the energy storage current transformer is connected with the battery pack, the second group of interfaces of the energy storage current transformer is connected with the first group of interfaces of the first switching power supply module, the first switch is arranged between the second group of interfaces of the energy storage current transformer and the first group of interfaces of the first switching power supply module, the third group of interfaces of the energy storage current transformer is connected with the load end, the fourth group of interfaces of the energy storage current transformer is connected with the external power network, the fifth group of interfaces of the energy storage current transformer is connected with the first group of interfaces of the second switching power supply module, and the sixth group of interfaces of the energy storage current transformer is connected with the ground end;
the second group of interfaces of the first switch power supply module is connected with the first group of interfaces of the management module, and the third group of interfaces of the first switch power supply module is connected with the first group of interfaces of the storage battery;
the second switch is arranged between the direct current contactor and the second set of interfaces of the storage battery, so that when the second switch is conducted to a circuit between the direct current contactor and the second set of interfaces of the storage battery, the first switch is controlled to be closed by the direct current contactor to conduct the circuit between the second set of interfaces of the energy storage converter and the first set of interfaces of the first switch power supply module;
the second group of interfaces of the second switching power supply module is connected with the first group of interfaces of the management module;
the second group of interfaces of the management module is connected with the grounding end, and the management module is respectively connected with the energy storage converter and the first switching power supply module in a communication mode.
In an alternative of the first aspect, the system further comprises a first reverse current diode arranged between the second set of interfaces of the first switching power supply module and the first set of interfaces of the management module.
In a further alternative of the first aspect, the system further comprises a second reverse current diode arranged between the second set of interfaces of the second switching power supply module and the first set of interfaces of the management module.
In a further alternative of the first aspect, the system further comprises a cold liquid machine set connected with the fifth set of interfaces of the energy storage converter and the first set of interfaces of the second switching power supply module, respectively.
In a further alternative of the first aspect, the system further comprises a grid power down indicator, the grid power down indicator being arranged between the third set of interfaces of the management module and the ground.
In a second aspect, an embodiment of the present application provides an outdoor energy storage method for implementing an off-grid and on-grid function, where the method is applied to an outdoor energy storage system for implementing the off-grid and on-grid function provided in the first aspect or any implementation manner of the first aspect, and the method includes:
when the existence of commercial power in the external power grid is detected, outputting a first voltage to a second switching power supply module based on the energy storage converter, and rectifying the first voltage by the second switching power supply module to obtain a second voltage; wherein the first voltage is generated based on the mains;
outputting a second voltage to the management module based on the second switching power supply module to wake up the management module;
when the management module is in an awakening state, a power-on instruction is sent to the energy storage converter based on the management module, so that the energy storage converter is converted into a working mode from a standby mode, and the energy storage converter supplies power to an external power grid.
In an alternative of the second aspect, after detecting that the external network is present in the mains, the method further comprises:
the second switch is controlled to be switched into a conducting state from an opening state, so that the second switch conducts a circuit between the direct current contactor and a second group of interfaces of the storage battery, and the first switch is controlled to be closed by the direct current contactor so as to conduct a circuit between the second group of interfaces of the energy storage converter and the first group of interfaces of the first switching power supply module;
the energy storage converter is used for outputting a third voltage to the second switching power supply module, and the second switching power supply module is controlled to convert the third voltage according to the voltage value of the storage battery to obtain a fourth voltage;
and outputting the fourth voltage to the storage battery and the management module respectively based on the first switching power supply module.
In yet another alternative of the second aspect, the method further comprises:
when the power failure of the commercial power of the external power grid is detected, the energy storage converter is powered on based on the battery pack, so that the energy storage converter outputs a third voltage to the second switching power supply module;
according to the voltage value of the storage battery, controlling the second switching power supply module to convert the third voltage to obtain a fourth voltage;
outputting a fourth voltage to the management module based on the second switching power supply module, and sending a power-on instruction to the energy storage converter based on the management module so as to enable the energy storage converter to be in a working mode continuously;
and supplying power to a load end based on the energy storage converter.
In a further alternative of the second aspect, after supplying power to the load side based on the energy storage converter, the method further comprises:
when the battery pack is detected to continuously supply power to the energy storage converter within a preset time interval, acquiring a first residual voltage of the battery pack;
when the first residual voltage is detected to be in a preset voltage threshold value interval, sending prompt information corresponding to the residual voltage to a first switching power supply module based on a management module, and sending a shutdown instruction to an energy storage converter;
controlling the first switching power supply module to stop outputting the fourth voltage to the management module, and controlling the energy storage converter to be converted into a standby mode from a working mode;
the second switch is controlled to be switched from an on state to an off state.
In yet another alternative of the second aspect, after detecting that the external grid is present in the mains, the method further comprises:
acquiring a second residual voltage of the battery pack;
and when the second residual voltage is detected to be in the preset voltage threshold interval, sending charging information to the user side.
In a third aspect, an embodiment of the present application provides an outdoor energy storage device for implementing an off-grid function, where the device is applied to an outdoor energy storage system for implementing an off-grid function provided in the first aspect or any implementation manner of the first aspect of the present application, where the device includes:
the first processing module is used for outputting a first voltage to the second switching power supply module based on the energy storage converter when the existence of the commercial power in the external power network is detected, and rectifying the first voltage by the second switching power supply module to obtain a second voltage; wherein the first voltage is generated based on the mains;
the second processing module is used for outputting a second voltage to the management module based on the second switching power supply module so as to wake up the management module;
and the third processing module is used for sending a power-on instruction to the energy storage converter based on the management module when the management module is in the awakening state so as to enable the energy storage converter to be converted into a working mode from a standby mode and supply power to an external power grid through the energy storage converter.
In a fourth aspect, an embodiment of the present application further provides an outdoor energy storage device for implementing an off-grid and on-grid function, where the device is applied to the outdoor energy storage system for implementing the off-grid and on-grid function provided in the first aspect or any implementation manner of the first aspect of the present application, and the device includes a processor and a memory;
the processor is connected with the memory;
a memory for storing executable program code;
the processor executes a program corresponding to the executable program code by reading the executable program code stored in the memory, so as to implement the outdoor energy storage method for implementing the grid-connected off function provided in the second aspect or any implementation manner of the second aspect of the embodiments of the present application.
In a fifth aspect, embodiments of the present application provide a computer storage medium, where a computer program is stored, where the computer program includes program instructions, where the program instructions, when executed by a processor, may implement an outdoor energy storage method for implementing a grid-tie-off function provided by the second aspect or any implementation manner of the second aspect of embodiments of the present application.
In an embodiment of the application, an outdoor energy storage system for implementing a grid-connected function may include an energy storage converter, a battery pack, a first switch, a first switching power supply module, a dc contactor, a storage battery, a second switch, a second switching power supply module, and a management module. Through parts such as first switching power supply module, direct current contactor and battery that add, can realize from the switching between the grid-connected function and the grid-connected mode, and can effectively avoid the unable normal work defect that the commercial power loses the electricity and lead to, improve outdoor energy storage overall efficiency when reducing input cost.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of an existing outdoor energy storage system according to an embodiment of the present application;
FIG. 2 is a schematic diagram of another prior art outdoor energy storage system according to an embodiment of the present disclosure;
fig. 3 is a schematic structural diagram of an outdoor energy storage system for implementing an off-grid function according to an embodiment of the present disclosure;
fig. 4 is a schematic structural diagram of still another outdoor energy storage system for implementing an off-grid function according to an embodiment of the present disclosure;
fig. 5 is an overall flowchart of an outdoor energy storage method for implementing a grid-connected/disconnected function according to an embodiment of the present application;
fig. 6 is a schematic structural diagram of an outdoor energy storage device for implementing a grid-connected function according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application.
In the following description, the terms "first," "second," and "first," are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. The following description provides various embodiments of the present application, and various embodiments may be substituted or combined, so that the present application is also intended to encompass all possible combinations of the same and/or different embodiments described. Thus, if one embodiment includes feature A, B, C and another embodiment includes feature B, D, then the present application should also be considered to include embodiments that include one or more of all other possible combinations including A, B, C, D, although such an embodiment may not be explicitly recited in the following.
The following description provides examples and does not limit the scope, applicability, or examples set forth in the claims. Changes may be made in the function and arrangement of elements described without departing from the scope of the application. Various examples may omit, replace, or add various procedures or components as appropriate. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Furthermore, features described with respect to some examples may be combined into other examples.
Referring to fig. 1, fig. 1 is a schematic structural diagram of an existing outdoor energy storage system according to an embodiment of the present application.
As shown in fig. 1, as a relatively common existing outdoor energy storage system, the structure of the existing outdoor energy storage system may include an energy storage converter (corresponding to the PCS in fig. 1), a battery pack, a switching power supply module (corresponding to the AC/DC in fig. 1), a management module (corresponding to the BMS in fig. 1), a liquid cooling unit and a fire protection system, wherein, after mains supply is connected to the energy storage converter through an external network, the battery pack inputs voltage to the energy storage converter so that the energy storage converter supplies power to a public power network, a grid connection scheme is realized, and the energy storage converter outputs voltage to the switching power supply module and the liquid cooling unit, on one hand, the battery can be ensured to be at a normal working temperature based on the liquid cooling unit and a pipeline thereof, and on the other hand, the switching power supply module supplies power to the fire protection system so as to prevent thermal runaway of the battery pack by adopting a hot start or electric start mode through the fire protection system.
However, for the technical proposal mentioned above, the whole set of system can work normally only when the utility power is externally connected; once the power is lost in the city, the outdoor cabinet cannot work normally, namely, only the grid-connected function is realized, and the off-grid function cannot be realized normally.
Referring to fig. 2, fig. 2 is a schematic structural diagram of still another existing outdoor energy storage system according to an embodiment of the present application.
As shown in fig. 2, as another existing outdoor energy storage system, the structure may include an energy storage converter (corresponding to the PCS in fig. 2), a battery pack, a switching power module (corresponding to the AC/DC in fig. 2), a management module (corresponding to the BMS in fig. 2), a liquid cooling unit, a fire protection system, and an ATS switching cabinet. The battery packs can be connected in series into the ATS switch cabinet of the energy storage converter, and then the ATS switch cabinet is connected into the energy storage converter so as to be input into the power grid by the energy storage converter to realize a corresponding grid-off scheme. It can be understood that the liquid cooling unit and the pipeline thereof ensure that the battery is at normal working temperature, and the switch power supply module can also supply power to the fire-fighting system so as to prevent the thermal runaway of the battery pack by adopting a hot start or electric start mode through the fire-fighting system.
However, aiming at the technical scheme, the ATS switch cabinet has the defects of high price, greatly increased installation space, high manufacturing cost of the outdoor cabinet, compact installation layout, high risk of failure of electrical connection points and the like.
Based on the above-mentioned multiple prior art schemes, referring to fig. 3, fig. 3 shows a schematic structural diagram of an outdoor energy storage system for implementing a grid-connected function according to an embodiment of the present application.
As shown in fig. 3, the outdoor energy storage system for implementing the grid-off function may specifically include an energy storage converter, a battery pack, a first switch, a first switching power module, a dc contactor, a storage battery, a second switch, a second switching power module, and a management module, where:
the first group of interfaces of the energy storage current transformer is connected with the battery pack, the second group of interfaces of the energy storage current transformer is connected with the first group of interfaces of the first switching power supply module, the first switch is arranged between the second group of interfaces of the energy storage current transformer and the first group of interfaces of the first switching power supply module, the third group of interfaces of the energy storage current transformer is connected with the load end, the fourth group of interfaces of the energy storage current transformer is connected with the external power network, the fifth group of interfaces of the energy storage current transformer is connected with the first group of interfaces of the second switching power supply module, and the sixth group of interfaces of the energy storage current transformer is connected with the ground end;
the second group of interfaces of the first switch power supply module is connected with the first group of interfaces of the management module, and the third group of interfaces of the first switch power supply module is connected with the first group of interfaces of the storage battery;
the second switch is arranged between the direct current contactor and the second set of interfaces of the storage battery, so that when the second switch is conducted to a circuit between the direct current contactor and the second set of interfaces of the storage battery, the first switch is controlled to be closed by the direct current contactor to conduct the circuit between the second set of interfaces of the energy storage converter and the first set of interfaces of the first switch power supply module;
the second group of interfaces of the second switching power supply module is connected with the first group of interfaces of the management module;
the second group of interfaces of the management module is connected with the grounding end, and the management module is respectively connected with the energy storage converter and the first switching power supply module in a communication mode.
The energy storage converter can be understood as a process control system, on the one hand, under the condition that an external power grid is connected with the mains supply, the mains supply is obtained through the external power grid, the mains supply is converted into an alternating auxiliary voltage 220V under the action of a related circuit, the alternating auxiliary voltage can be output to the second switching power supply module, and the energy storage converter can supply power to the external power grid at the moment; meanwhile, under the condition that a circuit between the direct current contactor and a second group of the storage battery is conducted, the voltage input by the battery group can be output to the first switching power supply module, so that the outdoor energy storage system is in a grid-connected mode at the moment.
On the other hand, under the condition that the commercial power connected to the external power grid is powered down, the circuit between the direct current contactor and the second group of interfaces of the storage battery is conducted, so that the energy storage converter outputs voltage to the first switching power supply module, and further, the management module sends an instruction to the energy storage converter to control the outdoor energy storage system to be converted into an off-grid mode from a grid mode. It will be appreciated that the energy storage converter may then output a voltage to the load terminal under the influence of the battery pack to power the load terminal.
In the embodiment of the present application, except for the sixth group of interfaces, the energy storage converter is an interface connected to the ground, the third group of interfaces is four interfaces for connecting to the public power grid, and the other groups of interfaces are two interfaces corresponding to the positive electrode and the negative electrode respectively; the interfaces of the first switch power supply module are two interfaces corresponding to the positive electrode and the negative electrode respectively; the interfaces of the second switching power supply module are two interfaces corresponding to the positive electrode and the negative electrode respectively; the first group of interfaces of the management module are two interfaces corresponding to the positive electrode and the negative electrode respectively, and the second group of interfaces are one interface connected with the grounding end.
The battery pack is understood to be composed of a plurality of batteries connected in series, the positive and negative interfaces of which are respectively connected with a first set of interfaces of the energy storage converter, which is understood here to be two interfaces respectively connected with the positive and negative electrodes.
The first switching power supply module is understood to be a switching power supply chip for increasing or decreasing the voltage input by the second set of interfaces of the energy storage converter, which is understood here to be two interfaces respectively connecting the input positive and the input negative interfaces of the energy storage converter.
The first switch is understood to be a contact switch, which is arranged between the second set of interfaces of the energy storage converter and the first set of interfaces of the first switching power supply module, and which automatically changes from an off state to an on state according to a magnetic field generated by the dc contactor when the circuit in which the dc contactor is located is on. It should be noted that, the first switch and the dc contactor are in a corresponding relationship, and the distance between the first switch and the dc contactor is in a preset distance interval, so that the dc contactor controls the closed state of the first switch.
The storage battery can be used for outputting voltage to the direct current contactor and can also receive the voltage output by the first switching power supply module, namely, on one hand, the first switching power supply module can supply power to the storage battery, on the other hand, the storage battery can output voltage to the direct current contactor, and when the direct current contactor outputs power to the storage battery, the output voltage is required to be ensured to be consistent with the voltage set by the storage battery.
The second switch is disposed between the dc contactor and the second set of interfaces of the battery to control the closed state to turn on or off the circuit between the dc contactor and the second set of interfaces of the battery, where the second switch may be controlled by an automatic program to adjust the closed state, or may be controlled by a similar dc contactor to adjust the closed state, or may be adjusted by a user in the case of sending a request to the user, but the present invention is not limited thereto.
The second switching power supply module may be understood as a switching power supply chip, which is configured to boost or reduce a voltage input by the fifth set of interfaces of the energy storage converter, and may output the rectified voltage to the management module, so as to supply power to the management module. It should be noted that, the voltage output by the second switching power supply module to the management module needs to be consistent with the voltage output by the first switching power supply module to the management module, for example, but not limited to, when the voltage output by the first switching power supply module to the management module is 12V, the voltage output by the second switching power supply module to the management module is also 12V.
The management module may be understood as an equipment management system, and is configured to send a power-on instruction to the energy storage converter by wireless communication or wired communication when the first switching power supply module or the second switching power supply module supplies power to the management module, so that the energy storage converter is converted from a standby mode to a normal working mode; or when the battery pack is in a discharging state for a long time and is in a non-mains supply state, a shutdown instruction is sent to the energy storage converter in a wireless communication or wired communication mode, so that the energy storage converter is converted into a standby mode from a normal working mode.
As an alternative to the embodiment of the present application, in order to prevent the reverse flow of the current or the voltage from being damaged due to the reverse impact on the circuit or the element, the outdoor energy storage system for implementing the grid-connected function further includes a first reverse flow diode, which is disposed between the second set of interfaces of the first switching power supply module and the first set of interfaces of the management module.
As yet another alternative of the embodiment of the present application, in order to prevent reverse flow of current or voltage from being damaged by reverse impact on the circuit or element, the outdoor energy storage system for implementing the off-grid function further includes a second reverse flow diode disposed between the second set of interfaces of the second switching power supply module and the first set of interfaces of the management module.
As yet another alternative of the embodiment of the present application, in order to ensure that the battery pack is at a normal operating temperature, the outdoor energy storage system for implementing the grid-connected function further includes a cooling fluid unit, where the cooling fluid unit is connected to the fifth set of interfaces of the energy storage converter and the first set of interfaces of the second switching power supply module, respectively.
As yet another alternative to the embodiments of the present application, in order to prevent thermal runaway of the battery pack, the outdoor energy storage system for implementing the grid-tie-off function further includes a fire protection system connectable with the second set of interfaces of the first switching power supply module to supply power to the fire protection system by the first switching power supply module, and the fire protection system may further establish a communication connection with the management module.
Referring to fig. 4, fig. 4 is a schematic structural diagram of still another outdoor energy storage system for implementing an off-grid function according to an embodiment of the present application.
As shown in fig. 4, the outdoor energy storage system for implementing the off-grid and on-grid function may specifically include an energy storage converter (corresponding to the PCS in fig. 4), a battery pack, a first switch, a first switching power supply module (corresponding to the DC/DC in fig. 4), a DC contactor, a storage battery (chargeable 12V), a second switch, a second switching power supply module (corresponding to the AC/DC in fig. 4), a management module (corresponding to the BMS in fig. 4), a liquid cooling unit, and a fire protection system, wherein:
the first group of interfaces (B+ and B-) of the energy storage current transformer are connected with the battery pack, the second group of interfaces (BUS+ and BUS-) of the energy storage current transformer are connected with the first group of interfaces (DC+ and DC-) of the first switching power supply module, the first switch is arranged between the second group of interfaces (BUS+ and BUS-) of the energy storage current transformer and the first group of interfaces (DC+ and DC-) of the first switching power supply module, the third group of interfaces (U, V, W and N) of the energy storage current transformer are connected with the load end, the fourth group of interfaces of the energy storage current transformer are connected with the external power network, the fifth group of interfaces (L and N) of the energy storage current transformer are connected with the first group of interfaces (L and N) of the second switching power supply module, and the sixth group of interfaces (PE) of the energy storage current transformer are connected with the ground end;
the second group of interfaces (12V & lt+ & gt and 12V & lt- & gt) of the first switching power supply module are connected with the first group of interfaces of the management module, and the third group of interfaces (12V & lt+ & gt and 12V & lt- & gt of the first switching power supply module are connected with the first group of interfaces of the storage battery;
the direct current contactor is connected with a second group of interfaces (BUS+ and BUS-) of the energy storage converter and a circuit between the second group of interfaces (DC+ and DC-) of the first switching power supply module are conducted by controlling the first switch to be closed by the direct current contactor when the second switch is arranged between the direct current contactor and the second group of interfaces (DC+ and DC-) of the storage battery so that the second switch conducts the circuit between the direct current contactor and the second group of interfaces (DC+ and DC-) of the storage battery;
the second group of interfaces (12 V+ and 12V-) of the second switching power supply module are connected with the first group of interfaces of the management module;
the second group of interfaces of the management module is connected with the grounding end, the management module is respectively connected with the energy storage converter, the first switching power supply module and the fire protection system in a communication way, the management module can be further provided with a third group of interfaces, and a power grid power-down indicator lamp is arranged between the third group of interfaces and the grounding end so as to be convenient for outputting voltage to a circuit between the third group of interfaces and the grounding end when the occurrence of power failure of the commercial power is detected, and further the power grid power-down indicator lamp is lightened;
the first reverse flow diode is arranged between the second group of interfaces (12V & lt+ & gt and 12V & lt- & gt) of the first switching power supply module and the first group of interfaces of the management module;
the second reverse flow diode is arranged between a second group of interfaces (12V & lt+ & gt and 12V & lt- & gt) of the second switching power supply module and a first group of interfaces of the management module;
the cold liquid unit is respectively connected with a fifth group of interfaces (L and N) of the energy storage converter and a first group of interfaces of the second switching power supply module;
the fire protection system may be connected to a second set of interfaces (12V+ and 12V-) of the first switching power supply module.
Referring to fig. 5, fig. 5 is an overall flowchart of an outdoor energy storage method for implementing an off-grid function according to an embodiment of the present application, where the outdoor energy storage method for implementing an off-grid function is applied to the outdoor energy storage system for implementing an off-grid function according to one or more embodiments described above.
As shown in fig. 5, the outdoor energy storage method for implementing the grid-off function at least includes the following steps:
Specifically, in the use process of the above-mentioned outdoor energy storage system for implementing the grid-off function, when the existence of the mains supply in the external grid is detected, which indicates that the system needs to be controlled in the grid-off mode at this time, the mains supply can be converted into AC auxiliary voltage AC220V (i.e., the first voltage) based on the correlation circuit between the energy storage converter and the external grid and output to the second switching power module, and the second switching power module can, but is not limited to, convert the AC auxiliary voltage AC220V into dc 12V (i.e., the second voltage) according to the voltage (12V) of the storage battery; then, the second switching power supply module can output direct current 12V to the management module so as to wake up the management module under the condition of supplying power to the management module; and then, after the management module wakes up, the management module can be controlled to send a power-on instruction to the energy storage converter so as to enable the energy storage converter to be converted into a normal working mode from a standby mode, and the energy storage converter is controlled to supply power to an external power grid.
It can be understood that the second switching power supply module can also output the direct current 12V to the liquid cooling unit, so that the liquid cooling unit is in a working state to cool the battery pack.
As an option of an embodiment of the present application, after detecting that the external network has the mains supply, the method further includes:
the second switch is controlled to be switched into a conducting state from an opening state, so that the second switch conducts a circuit between the direct current contactor and a second group of interfaces of the storage battery, and the first switch is controlled to be closed by the direct current contactor so as to conduct a circuit between the second group of interfaces of the energy storage converter and the first group of interfaces of the first switching power supply module;
the energy storage converter is used for outputting a third voltage to the first switching power supply module, and the first switching power supply module is controlled to convert the third voltage according to the voltage value of the storage battery to obtain a fourth voltage;
and outputting the fourth voltage to the storage battery and the management module respectively based on the first switching power supply module.
Specifically, when the existence of the mains supply in the external power network is detected, the second switch can be controlled to be switched into the on state from the off state through an automatic control program or a manual mode, so that a circuit between the direct current contactor and the second group of interfaces of the storage battery is conducted, and then the second switch is informed of being in the on state from the off state through a magnetic field generated by the direct current contactor, so that a circuit between the second group of interfaces of the energy storage converter and the first group of interfaces of the first switching power supply module is conducted. Then, after the circuit between the second set of interfaces of the energy storage converter and the first set of interfaces of the first switching power supply module is conducted, the energy storage converter can be controlled to output the voltage acquired from the battery pack (namely, the third voltage) to the first switching power supply module, and the first switching power supply module is controlled to convert the voltage into direct current 12V (namely, the fourth voltage) according to the voltage (12V) of the storage battery; then, the first switching power supply module can output the direct current 12V to the management module and the fire protection system so as to supply power to the management module and the fire protection system.
As yet another alternative of the embodiments of the present application, the method further includes:
when the power failure of the commercial power of the external power grid is detected, the energy storage converter is powered on based on the battery pack, so that the energy storage converter outputs a third voltage to the first switching power supply module;
according to the voltage value of the storage battery, the first switching power supply module is controlled to convert the third voltage to obtain a fourth voltage;
outputting a fourth voltage to a management module based on the first switching power supply module, and sending a power-on instruction to the energy storage converter based on the management module so as to enable the energy storage converter to be in a working mode continuously;
and supplying power to a load end based on the energy storage converter.
Specifically, in the use process of the above-mentioned outdoor energy storage system for realizing the grid-connected function, when it is detected that the external power grid has a mains supply failure, it indicates that the system needs to be controlled to be in the grid-connected mode at this time, the energy storage converter can be controlled to output the voltage (i.e., the third voltage) obtained from the battery pack to the first switching power supply module, and the first switching power supply module is controlled to convert the voltage into the direct current 12V (i.e., the fourth voltage) according to the voltage (12V) of the storage battery; then, the first switching power supply module can output direct current 12V to the management module and the fire protection system so as to supply power to the management module and the fire protection system; and after the management module wakes up, the management module can be controlled to send an instruction to the energy storage converter so as to enable the energy storage converter to be in a normal working mode continuously, and the energy storage converter is controlled to output a three-phase four-wire system to supply power to a load end.
It should be noted that, here, the energy storage converter may also be controlled to output the voltage obtained from the battery pack (i.e., the third voltage) to the second switching power module, and control the second switching power module to convert the voltage into the direct current 12V according to the voltage (12V) of the storage battery, and output the direct current 12V to the management module, so as to realize the dual-branch power supply of the management module.
As yet another alternative of the embodiment of the present application, after supplying power to the load terminal based on the energy storage converter, the method further includes:
when the battery pack is detected to continuously supply power to the energy storage converter within a preset time interval, acquiring a first residual voltage of the battery pack;
when the first residual voltage is detected to be in a preset voltage threshold value interval, sending prompt information corresponding to the residual voltage to a first switching power supply module based on a management module, and sending a shutdown instruction to an energy storage converter;
controlling the first switching power supply module to stop outputting the fourth voltage to the management module, and controlling the energy storage converter to be converted into a standby mode from a working mode;
the second switch is controlled to be switched from an on state to an off state.
Specifically, in the process of controlling the energy storage converter to acquire voltage from the battery pack, namely, the battery pack is in a discharging state for a long time and is in a non-mains supply state, the residual electric quantity of the battery pack can be monitored in real time, and when the battery pack is detected to continuously supply power to the energy storage converter within a preset time interval, the risk of insufficient residual current of the battery pack is indicated, and then the first residual voltage of the battery pack can be acquired; then, when the first residual voltage is detected to be in the preset voltage threshold value interval, the controllable management module sends prompt information corresponding to the residual voltage to the first switching power supply module and sends a shutdown instruction to the energy storage converter, and the first switching power supply module stops supplying power to the management module after receiving the prompt information and controls the energy storage converter to be converted into a standby mode from a working mode. In order to avoid the discharge of the storage battery to be in a power shortage state, the second switch can be controlled to be switched from an on state to an off state.
As yet another alternative of the embodiment of the present application, after detecting that the external electric network exists in the electric mains, the method further includes:
acquiring a second residual voltage of the battery pack;
and when the second residual voltage is detected to be in the preset voltage threshold interval, sending charging information to the user side.
Specifically, in order to ensure that the battery pack can output voltage to the energy storage converter in real time, the residual voltage of the battery pack can be obtained after the existence of commercial power in the external power grid is detected, and when the residual voltage is detected to be in a preset voltage threshold interval, the battery pack is indicated to need to be charged, charging information can be sent to a user side, so that a user can charge the battery pack conveniently.
Referring to fig. 6, fig. 6 is a schematic structural diagram of an outdoor energy storage device for implementing an off-grid function according to an embodiment of the present application, where the outdoor energy storage device for implementing an off-grid function is applied to the outdoor energy storage system for implementing an off-grid function according to one or more embodiments described above.
As shown in fig. 6, the outdoor energy storage device for implementing the grid-off function may at least include a first processing module 601, a second processing module 602, and a third processing module 603, where:
the first processing module 601 is configured to output a first voltage to the second switching power supply module based on the energy storage converter when it is detected that the external power grid has the mains supply, and perform rectification processing on the first voltage by the second switching power supply module to obtain a second voltage; wherein the first voltage is generated based on the mains;
the second processing module 602 is configured to output a second voltage to the management module based on the second switching power supply module to wake up the management module;
and the third processing module 603 is configured to send a power-on instruction to the energy storage converter based on the management module when the management module is in the wake-up state, so that the energy storage converter is converted from the standby mode to the working mode, and the energy storage converter supplies power to the external power grid.
It will be apparent to those skilled in the art that the embodiments of the present application may be implemented in software and/or hardware. "Unit" and "module" in this specification refer to software and/or hardware capable of performing a specific function, either alone or in combination with other components, such as Field programmable gate arrays (Field-Programmable Gate Array, FPGAs), integrated circuits (Integrated Circuit, ICs), etc.
Claims (10)
1. An outdoor energy storage system for realizing from grid-connected function, its characterized in that, the system includes energy storage converter, group battery, first switch, first switching power module, direct current contactor, battery, second switch, second switching power module and management module, wherein:
the first group of interfaces of the energy storage current transformer is connected with the battery pack, the second group of interfaces of the energy storage current transformer is connected with the first group of interfaces of the first switching power supply module, the first switch is arranged between the second group of interfaces of the energy storage current transformer and the first group of interfaces of the first switching power supply module, the third group of interfaces of the energy storage current transformer is connected with the load end, the fourth group of interfaces of the energy storage current transformer is connected with the external power network, the fifth group of interfaces of the energy storage current transformer is connected with the first group of interfaces of the second switching power supply module, and the sixth group of interfaces of the energy storage current transformer is connected with the ground end;
the second group of interfaces of the first switching power supply module is connected with the first group of interfaces of the management module, and the third group of interfaces of the first switching power supply module is connected with the first group of interfaces of the storage battery;
the second switch is arranged between the direct current contactor and the second set of interfaces of the storage battery, so that when the second switch conducts a circuit between the direct current contactor and the second set of interfaces of the storage battery, the first switch is controlled to be closed by the direct current contactor to conduct a circuit between the second set of interfaces of the energy storage converter and the first set of interfaces of the first switching power supply module;
the second group of interfaces of the second switching power supply module is connected with the first group of interfaces of the management module;
the second group of interfaces of the management module is connected with the grounding end, and the management module is respectively connected with the energy storage converter and the first switching power supply module in a communication mode.
2. The system of claim 1, further comprising a first reverse current diode disposed between the second set of interfaces of the first switching power supply module and the first set of interfaces of the management module.
3. The system of claim 1, further comprising a second reverse current diode disposed between a second set of interfaces of the second switching power supply module and a first set of interfaces of the management module.
4. The system of claim 1, further comprising a chiller unit connected to the fifth set of interfaces of the energy storage converter and the first set of interfaces of the second switching power supply module, respectively.
5. The system of claim 1, further comprising a grid power down indicator light disposed between the third set of interfaces of the management module and the ground.
6. An outdoor energy storage method for implementing an off-grid function, wherein the method is applied to the system of any one of claims 1-5, the method comprising:
when the existence of commercial power in the external power network is detected, outputting a first voltage to the second switching power supply module based on the energy storage converter, and rectifying the first voltage by the second switching power supply module to obtain a second voltage; wherein the first voltage is generated based on the mains;
outputting the second voltage to the management module based on the second switching power supply module to wake up the management module;
when the management module is in an awakening state, a power-on instruction is sent to the energy storage converter based on the management module, so that the energy storage converter is converted into a working mode from a standby mode, and the energy storage converter supplies power to the external power grid.
7. The method of claim 6, further comprising, after the detecting that the external grid is present in mains electricity:
controlling the second switch to be switched from an off state to an on state so that the second switch conducts a circuit between the direct current contactor and a second set of interfaces of the storage battery, and controlling the first switch to be closed by the direct current contactor so as to conduct a circuit between a second set of interfaces of the energy storage converter and a first set of interfaces of the first switching power supply module;
based on the energy storage converter, outputting a third voltage to the first switching power supply module, and controlling the first switching power supply module to convert the third voltage according to the voltage value of the storage battery to obtain a fourth voltage;
and outputting the fourth voltage to the storage battery and the management module respectively based on the first switching power supply module.
8. The method of claim 7, wherein the method further comprises:
when the power failure of the commercial power of the external power grid is detected, the energy storage converter is powered on based on the battery pack, so that the energy storage converter outputs the third voltage to the first switching power supply module;
according to the voltage value of the storage battery, the first switching power supply module is controlled to convert the third voltage to obtain the fourth voltage;
outputting the fourth voltage to the management module based on the first switching power supply module, and sending the power-on instruction to the energy storage converter based on the management module so as to enable the energy storage converter to be in a working mode continuously;
and supplying power to the load end based on the energy storage converter.
9. The method of claim 8, further comprising, after said supplying power to said load side based on said energy storage converter:
when the battery pack is detected to continuously supply power to the energy storage converter within a preset time interval, acquiring a first residual voltage of the battery pack;
when the first residual voltage is detected to be in a preset voltage threshold value interval, sending prompt information corresponding to the residual voltage to the first switching power supply module based on the management module, and sending a shutdown instruction to the energy storage converter;
controlling the first switching power supply module to stop outputting the fourth voltage to the management module, and controlling the energy storage converter to be converted into a standby mode from a working mode;
and controlling the second switch to be switched from an on state to an off state.
10. The method of claim 6, further comprising, after the detecting that the external grid is present in mains electricity:
acquiring a second residual voltage of the battery pack;
and when the second residual voltage is detected to be in the preset voltage threshold value interval, sending charging information to the user side.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310405782.6A CN116388248A (en) | 2023-04-17 | 2023-04-17 | Outdoor energy storage system and method for achieving grid-connected and grid-disconnected functions |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310405782.6A CN116388248A (en) | 2023-04-17 | 2023-04-17 | Outdoor energy storage system and method for achieving grid-connected and grid-disconnected functions |
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| CN116388248A true CN116388248A (en) | 2023-07-04 |
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| CN202310405782.6A Pending CN116388248A (en) | 2023-04-17 | 2023-04-17 | Outdoor energy storage system and method for achieving grid-connected and grid-disconnected functions |
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| Country | Link |
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| CN (1) | CN116388248A (en) |
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