CN117578641A - Energy storage system and control method thereof - Google Patents
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- 101100060492 Ustilago maydis (strain 521 / FGSC 9021) CMU1 gene Proteins 0.000 description 11
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- 101150003196 PCS1 gene Proteins 0.000 description 6
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Abstract
The application discloses an energy storage system and a control method of the energy storage system, and belongs to the technical field of energy storage. The energy storage system includes: the battery cluster management unit is used for controlling the first switching device to be disconnected under the condition that the battery cluster is determined to be in a first power shortage state based on the battery state information of the battery cluster, so that the energy storage unit stops working, and outputting power shortage indicating information corresponding to the battery cluster to prompt power shortage supplementing operation; the battery cluster management unit is used for controlling the second switching device to be switched off under the condition that the battery cluster is in the second power shortage state based on the battery state information of the battery cluster, so that the energy storage system stops working, and outputting power shortage shutdown information of the energy storage system to prompt power supply maintenance. The system performs protection action on the battery based on the principle of priority of battery power shortage protection.
Description
Technical Field
The application belongs to the technical field of energy storage, and particularly relates to an energy storage system and a control method of the energy storage system.
Background
The energy storage system uses the battery as an energy storage carrier, can store electric energy in a certain time and supply the electric energy in a certain time, and the electric energy provided by the energy storage system has the functions of smooth transition, peak clipping, valley filling, frequency modulation, voltage regulation and the like, so that the operation stability of the power system is improved, and the energy storage system has important significance for power grid construction.
After the energy storage system is put into operation, the situation of power shortage caused by excessive discharge of the battery can occur, for example, when alternating current power supply is abnormal, the energy storage system can take power from the battery side for use, and when power is taken, power is not timely supplemented, and the battery power shortage can be caused; for another example, when the energy storage system is discharged to the end, the energy storage system is not supplied with power for a long time, and the battery may be damaged.
At present, the battery is subjected to power supply operation by timing maintenance of the energy storage system, the timeliness of battery power shortage phenomenon discovery is poor, and long-time battery power shortage can lead to damage of the energy storage system battery or other equipment.
Disclosure of Invention
The present application aims to solve at least one of the technical problems existing in the prior art. Therefore, the energy storage system and the control method thereof are provided, and the battery power shortage fault can be timely judged, so that the battery is protected, and the service life of the energy storage system is prolonged.
In a first aspect, the present application provides an energy storage system comprising:
the energy storage units comprise battery clusters, an energy storage converter and a battery cluster management unit, wherein the battery clusters and the energy storage converter are connected in series to form a battery power supply loop, a first switching device is arranged on the battery power supply loop, and the battery cluster management unit is connected with the battery clusters and the first switching device;
the battery cluster management unit is used for controlling the first switching device to be switched off under the condition that the battery cluster is in a first power shortage state based on the battery state information of the battery cluster, so that the energy storage unit stops working, and outputting power shortage indicating information corresponding to the battery cluster to indicate power shortage operation;
a second switching device is arranged on the output end total loop of the energy storage system, and the battery cluster management unit is connected with the second switching device;
the battery cluster management unit is used for controlling the second switching device to be disconnected under the condition that the battery cluster is in a second power shortage state based on the battery state information of the battery cluster, so that the energy storage system stops working, and outputting power shortage shutdown information of the energy storage system to prompt power supply maintenance.
According to the energy storage system, based on the principle of priority of battery power shortage protection, the first switching device of the battery power supply loop of the energy storage unit and the second switching device on the output end main loop of the energy storage system are controlled by the battery cluster management unit, judgment of power shortage faults and processing after the power shortage faults are more accurate and rapid, when the first power shortage state of the initial stage of power shortage occurs, a power shortage supplementing suggestion is timely output, when the second power shortage state of serious power shortage occurs, the forced system is stopped, the power shortage faults of the battery can be timely judged, the battery is protected, and the service life of the energy storage system is prolonged.
According to one embodiment of the present application, the battery cluster management unit is configured to determine that the battery cluster is in the first power-deficient state when it is determined that a lowest cell voltage of the battery cluster is less than a first voltage threshold and a duration of a discharge current of the battery cluster is longer than a first target duration.
According to one embodiment of the present application, the battery cluster management unit is configured to determine that the battery cluster is in the second power-deficient state when it is determined that a lowest cell voltage of the battery cluster is less than a second voltage threshold and a duration of no charging current in the battery cluster is longer than a second target duration.
According to an embodiment of the present application, the battery cluster management unit is further configured to control the second switching device to be turned off under a condition that it is determined that the battery sampling chip of the battery cluster is abnormal in communication and the energy storage system has no effective voltage value, so that the energy storage system stops working, and output abnormal shutdown information of the energy storage system to prompt maintenance.
According to one embodiment of the present application, further comprising:
the output end of the energy storage unit is connected to the first end of the switching power supply, and the second switching device is connected with the second end of the switching power supply.
In a second aspect, the present application provides a control method based on the energy storage system of the first aspect, where the method is applied to a battery cluster management unit, and the method includes:
acquiring battery state information of a battery cluster;
under the condition that the battery cluster is in a first power shortage state based on the battery state information of the battery cluster, controlling a first switching device corresponding to the battery cluster to be switched off so as to stop the work of an energy storage unit corresponding to the battery cluster, and outputting power shortage indicating information corresponding to the battery cluster to indicate power shortage operation;
and under the condition that the battery cluster is in the second power shortage state based on the battery state information of the battery cluster, controlling the second switching device to be disconnected so as to stop the work of the energy storage system, and outputting the power shortage shutdown information of the energy storage system to prompt the power shortage maintenance.
According to the control method of the energy storage system, based on the principle of priority of battery power shortage protection, the first switching device of the battery power supply loop of the energy storage unit and the second switching device on the output end main loop of the energy storage system are controlled by the battery cluster management unit, judgment of power shortage faults and processing after the power shortage faults are more accurate and rapid, when a first power shortage state at the initial stage of power shortage occurs, a power shortage supplementing instruction is timely output, when a second power shortage state of serious power shortage occurs, the system is forced to stop, the power shortage faults of the battery can be timely judged, the battery is protected, and the service life of the energy storage system is prolonged.
According to one embodiment of the present application, the determining that the battery cluster is in the first power-deficient state based on the battery state information of the battery cluster includes:
and under the condition that the lowest single voltage of the battery cluster is smaller than a first voltage threshold value and the duration of the discharge current of the battery cluster is longer than a first target duration, determining that the battery cluster is in the first power shortage state.
According to one embodiment of the present application, the determining that the battery cluster is in the second power-deficient state based on the battery state information of the battery cluster includes:
and under the condition that the lowest single voltage of the battery cluster is smaller than a second voltage threshold value and the duration time of no charging current in the battery cluster is longer than a second target duration time, determining that the battery cluster is in the second power shortage state.
According to one embodiment of the present application, the method further comprises:
and under the condition that the communication of the battery sampling chips of the battery clusters is abnormal and the energy storage system has no effective voltage value, controlling the second switching device to be disconnected so as to stop the energy storage system and outputting abnormal shutdown information of the energy storage system to prompt maintenance.
In a third aspect, the present application provides an electronic device, including a memory, a processor, and a computer program stored on the memory and executable on the processor, where the processor implements the method for controlling the energy storage system according to the second aspect.
In a fourth aspect, the present application provides a non-transitory computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements a method of controlling an energy storage system according to the second aspect described above.
In a sixth aspect, the present application provides a computer program product comprising a computer program which, when executed by a processor, implements a method of controlling an energy storage system according to the second aspect described above.
Additional aspects and advantages of the application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the application.
Drawings
The foregoing and/or additional aspects and advantages of the present application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, wherein:
FIG. 1 is a schematic diagram of an energy storage system according to an embodiment of the present disclosure;
FIG. 2 is a schematic diagram of a second embodiment of an energy storage system;
fig. 3 is a schematic flow chart of performing a battery protection action by the energy storage system according to the embodiment of the present application;
FIG. 4 is a flow chart of a control method of an energy storage system according to an embodiment of the present disclosure;
fig. 5 is a schematic structural diagram of an electronic device according to an embodiment of the present application.
Detailed Description
Technical solutions in the embodiments of the present application will be clearly described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application are within the scope of the protection of the present application.
The terms first, second and the like in the description and in the claims, are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged, as appropriate, such that embodiments of the present application may be implemented in sequences other than those illustrated or described herein, and that the objects identified by "first," "second," etc. are generally of a type and not limited to the number of objects, e.g., the first object may be one or more. Furthermore, in the description and claims, "and/or" means at least one of the connected objects, and the character "/", generally means that the associated object is an "or" relationship.
In the related art, the battery is mostly subjected to power supply operation by periodically overhauling the energy storage system, the timeliness of the discovery of the phenomenon of battery power shortage is poor, and the long-time battery power shortage can cause the damage of the battery or other equipment of the energy storage system.
For example, one device of the 0.25C energy storage system is composed of two battery clusters, when one battery cluster is deficient in power, the other battery cluster operates normally, so that the power consumption requirement of a user can be met, the abnormal battery cluster is in a power deficiency state for a long time, and is not maintained in time, so that the battery cluster or other devices in the system can be damaged.
The energy storage system and the control method of the energy storage system according to the embodiments of the present application are described below with reference to fig. 1 to fig. 4, which can timely determine the power shortage fault of the battery, protect the battery, and help to improve the service life of the energy storage system.
The energy storage system comprises at least two energy storage units which are connected in parallel, wherein each energy storage unit comprises a battery cluster, an energy storage converter and a battery cluster management unit.
The battery cluster (RACK) can be obtained by connecting battery cells in a serial, parallel or serial-parallel connection mode, and the energy storage converter (Power Conversion System, PCS) can control the charging and discharging processes of the battery cluster.
A battery Cluster Management Unit (CMU) acquires battery state information such as battery voltage, current and temperature of a battery cluster in real time.
In this embodiment, the battery clusters and the energy storage converters are connected in series to form a battery-powered loop of the energy storage units, the battery-powered loops of the energy storage units are connected in parallel, and a first switching device is arranged on the battery-powered loop of each energy storage unit. The first switching device can control the on-off of the battery power supply loop, when the first switching device is closed, the battery power supply loop is conducted, and the battery clusters are discharged outwards or charged through the energy storage converter.
The battery cluster management unit is connected with the battery cluster and the first switching device, and in one energy storage unit, the battery cluster management unit can collect battery state information of the battery cluster and can control the opening and closing of the first switching device according to the battery state information of the battery cluster so as to control the working state of the energy storage unit.
In this embodiment, the battery cluster management unit is configured to, when determining, based on battery state information of the battery cluster, that the battery cluster is in a first power-deficient state, control the first switching device to be turned off, so that the energy storage unit stops working, and output power-deficiency indication information corresponding to the battery cluster to indicate that power-deficiency operation is performed.
The output end total loop of the energy storage system is provided with a second switching device, the battery cluster management unit is connected with the second switching device, and in the energy storage system, the battery cluster management unit of any energy storage unit can control the opening and closing of the second switching device according to the battery state information of the battery clusters, so as to control the working state of the energy storage system.
In this embodiment, the battery cluster management unit is configured to control the second switching device to be turned off when it is determined that the battery cluster is in the second power-deficient state based on the battery state information of the battery cluster, so that the energy storage system stops working, and output power-deficient shutdown information of the energy storage system to prompt power-supplementing maintenance.
It can be understood that the first power shortage state is a state that the battery cluster is in the initial stage of power shortage, and the power storage unit can stop working, so that the battery cluster does not supply power to the battery cluster management unit and the energy storage converter any more, further discharge of the battery cluster is avoided, and meanwhile, power shortage indication information is output to prompt a user to perform power supplementing operation of the battery cluster.
The second power shortage state is that the battery cluster is in a state with serious power shortage, and the power shortage condition of the battery cluster can be concerned by a user through the mode that the energy storage system is stopped and the power shortage stop information is output, so that the user is prompted to contact after-sale to perform corresponding power supply maintenance, and the follow-up normal operation of the battery cluster is ensured.
In this embodiment, the energy storage system includes at least two energy storage units, and when the battery cluster of any one of the at least two energy storage units is in the first power-deficient state, the battery cluster management unit of the energy storage unit only controls the first switching device of the energy storage unit to be turned off, so that normal power supply of other energy storage units is not affected.
When the battery cluster of any one of the at least two energy storage units is in a second power shortage state, the battery cluster management unit of the energy storage unit controls the second switching device of the energy storage system to be disconnected, the energy storage system is stopped, so that a user pays attention to the power shortage condition of the battery cluster, and timely power supply maintenance is performed. For example, as shown in fig. 1, the energy storage system includes two energy storage units.
The energy storage unit 1 comprises a battery cluster RACK1, an energy storage converter PCS1 and a battery cluster management unit CMU1, wherein the RACK1 and the PCS1 are connected in series to form a battery power supply loop of the energy storage unit 1, and a first switching device CMU1-K1 is arranged on the battery power supply loop.
The energy storage unit 2 comprises a battery cluster RACK2, an energy storage converter PCS2 and a battery cluster management unit CMU2, wherein the RACK2 and the PCS2 are connected in series to form a battery power supply loop of the energy storage unit 2, and a first switching device CMU2-K1 is arranged on the battery power supply loop.
The output end total loop of the energy storage system is provided with a second switching device K2, the CMU1 can control the on-off states of the CMU1-K1 and the CMU2 according to the battery state information of the RACK1, and the CMU2 can control the on-off states of the CMU2-K1 and the CMU2 according to the battery state information of the RACK 2.
In this embodiment, the CMU1 determines, according to the battery state information of RACK1, that RACK1 is in the first power-deficient state at the initial stage of power deficiency, disconnects CMU1-K1, RACK1 no longer supplies power to CMU1 and PCS1, and simultaneously outputs power-deficiency indication information of RACK1, to prompt the user to perform power-up operation on RACK 1.
The CMU2 judges that the RACK2 is in a first power-deficient state at the initial stage of power deficiency according to the battery state information of the RACK2, the CMU2-K1 is disconnected, the RACK2 does not supply power to the CMU2 and the PCS2 any more, meanwhile, the power-deficiency indication information of the RACK2 is output, and a user is prompted to perform power-supplementing operation on the RACK 2.
When the CMU1 judges that the RACK1 is in the second power-deficient state with serious power deficiency or the CMU2 judges that the RACK2 is in the second power-deficient state with serious power deficiency, the CMU1 or the CMU2 can control the K2 to be disconnected, the energy storage system is stopped, the power-deficient stopping information is output, and a user is prompted to contact after-sale to perform power-supplementing maintenance of the corresponding battery cluster, so that the follow-up normal operation of the battery cluster is ensured.
It should be noted that, in the battery management system with the battery cluster management unit as the bottom layer, the first layer processing unit of the voltage and the current of the battery core, the judgment of the power failure and the processing after the power failure are more accurate and rapid. In the related art, the switch device is arranged to adjust the connection relation between the battery units in the charge and discharge process, so that the continuous operation of the whole system is mostly ensured when part of the battery units have faults, namely, the whole system operates based on the principle of system stability, and when part of the battery units in the system have power shortage in the technology, the system normally operates, so that a user cannot easily perceive the power shortage or the fault condition, the battery units with power shortage cannot be supplemented for a long time, the battery units are further damaged, and other equipment can be damaged.
In this embodiment, the battery cluster management unit controls the on-off state of the first switching device and the second switching device according to the battery state information, when the first power shortage state of the initial stage of power shortage appears in the battery cluster of a certain energy storage unit, the energy storage system is not stopped directly, but a warning is sent, the battery cluster corresponding to the energy storage unit is prompted to maintain the power supplementing operation, when the second power shortage state of serious power shortage appears in the battery cluster of a certain energy storage unit, the protection battery is prioritized, the system power supply is disconnected, the forced system is stopped, the user pays attention to the power shortage problem, timely maintenance is performed, the energy storage system can continue to work after the power shortage problem is solved, the battery is protected based on the principle of the priority of the power shortage protection of the battery, and the damage of the battery due to over-discharging can be effectively avoided. According to the energy storage system provided by the embodiment of the application, based on the principle of priority of battery power shortage protection, the first switching device of the battery power supply loop of the energy storage unit and the second switching device on the output end main loop of the energy storage system are controlled by the battery cluster management unit, the judgment of the power shortage fault and the processing after the power shortage fault are more accurate and rapid, when the first power shortage state of the initial stage of the power shortage occurs, the power shortage is timely output, the power shortage is suggested, when the second power shortage state of the serious power shortage occurs, the system is forced to stop, the power shortage fault of the battery can be timely judged, the protection action is carried out on the battery, and the service life of the energy storage system is prolonged.
In some embodiments, the battery cluster management unit is configured to determine that the battery cluster is in the first power-deficient state when it is determined that the lowest cell voltage of the battery cluster is less than the first voltage threshold and the duration of the discharge current of the battery cluster is longer than the first target duration.
It can be understood that the cell voltage is the voltage of a single cell module in the battery cluster, the lowest cell voltage of the battery cluster is the minimum voltage of all the cell modules in the battery cluster, and the power shortage state of the battery cluster is judged according to the lowest cell voltage of the battery cluster.
The first voltage threshold is a preset single voltage threshold, which can be a voltage value of a single undervoltage three-level fault of the battery cluster, and when the lowest single voltage of the battery cluster is smaller than the first voltage threshold, the condition that the battery cluster is possibly under-voltage and under-voltage is indicated.
In this embodiment, whether the battery cluster is in a continuous discharge state is determined according to whether the battery cluster has a discharge current, the battery cluster has a discharge current in a continuous discharge state, the voltage is continuously reduced, and the electric quantity of the battery cluster is further reduced.
When the lowest single voltage of the battery cluster is smaller than a first voltage threshold value and the duration time of the discharge current of the battery cluster is longer than a first target duration time, the battery cluster is indicated to be in a first power-shortage state at the initial stage of power shortage, the battery cluster management unit controls a first switching device corresponding to the battery cluster to be disconnected, and the battery cluster stops supplying power to the devices such as the energy storage converter and the battery cluster management unit.
The first target duration is a preset duration critical value.
Taking the first voltage threshold value of 2.3V as an example, the first target duration is 30min as an example.
The battery cluster management unit detects that the lowest single voltage of the battery cluster is smaller than 2.3V and the duration time of the discharge current is longer than 30min, judges that the battery cluster is in a first power-deficient state in the initial stage of power deficiency, and controls the energy storage unit to stop supplying power.
In some embodiments, the battery cluster management unit is configured to determine that the battery cluster is in the second power-deficient state when it is determined that the lowest cell voltage of the battery cluster is less than the second voltage threshold and the duration of no charging current within the battery cluster is greater than the second target duration.
The second voltage threshold is a preset monomer voltage threshold, and the second target duration is a preset duration threshold.
It can be understood that the first power-deficient state is a state of initial power-deficient state, the second power-deficient state is a state of serious power-deficient state, the second voltage threshold is smaller than the first voltage threshold, the timeliness of the protection action is important when the power-deficient state is serious, and the second target duration is smaller than the first target duration.
It should be noted that, according to whether the battery cluster has a charging current, whether the battery cluster is in a charging state is determined, when the lowest cell voltage of the battery cluster is smaller than the second voltage threshold, the energy storage unit discharges to the end, no charging current is in the battery cluster, and further power shortage is caused when standby is not performed.
When the lowest single voltage of the battery cluster is smaller than a second voltage threshold value and the duration of no charging current of the battery cluster is longer than a second target duration, the battery cluster is indicated to be in a second power-shortage state with serious power shortage, and the battery cluster management unit controls the second switching device to be switched off, so that the energy storage system is stopped.
Taking the second voltage threshold value as 2V as an example, the second target duration is 1min as an example.
The battery cluster management unit detects that the lowest single voltage of the battery cluster is smaller than 2V and the duration time of no charging current is longer than 1min, judges that the battery cluster is in a second power-deficiency state with serious power deficiency, and controls the energy storage system to stop.
In some embodiments, the battery cluster management unit is further configured to control the second switching device to be turned off under a condition that it is determined that the battery sampling chip of the battery cluster is abnormal in communication and the energy storage system has no effective voltage value, so that the energy storage system stops working, and output abnormal shutdown information of the energy storage system to prompt maintenance.
A battery sampling chip (AFE) is a device for acquiring data such as a voltage and a temperature of a battery core, and a battery cluster management unit may acquire battery state information of a battery cluster through the battery sampling chip.
In this embodiment, when the battery cluster management unit determines that the battery sampling chip of the battery cluster is abnormal in communication and the energy storage system has no effective voltage value, the second switching device is controlled to be turned off, the energy storage system stops working, the energy storage system is prevented from being further damaged by the abnormality, corresponding abnormal shutdown information is output, a user is prompted to maintain the energy storage system, and abnormal risks of the energy storage system are eliminated.
In some embodiments, the energy storage system further comprises a switching power supply.
In this embodiment, the output terminal of the at least one energy storage unit is connected to a first terminal of the switching power supply, and the second switching device is connected to a second terminal of the switching power supply.
The switching power supply (Switch Mode Power Supply, SMPS) is an electric energy conversion device, and functions to convert a voltage of a level into a voltage or a current required by a user terminal through different types of architectures, wherein an input of the switching power supply may be an ac power supply or a dc power supply.
The switching power supply is a device of an output end total loop of the energy storage system, a first end of the switching power supply is connected with output ends of all energy storage units of the energy storage system, and the energy storage units provide electric energy for the switching power supply during normal operation.
The second end of the switching power supply is connected with the second switching device, and when the energy storage unit is in a second power-shortage state, the battery cluster management unit controls the second switching device to be disconnected, and the energy storage system stops providing electric energy for the switching power supply.
A specific embodiment is described below.
As shown in fig. 2, the energy storage system includes two energy storage units, the energy storage unit 1 includes a battery cluster RACK1, an energy storage converter PCS1 and a battery cluster management unit CMU1, the RACK1 and the PCS1 are connected in series to form a battery power supply loop of the energy storage unit 1, and a first switching device CMU1-K1 is disposed on the battery power supply loop.
The energy storage unit 2 comprises a battery cluster RACK2, an energy storage converter PCS2 and a battery cluster management unit CMU2, wherein the RACK2 and the PCS2 are connected in series to form a battery power supply loop of the energy storage unit 2, and a first switching device CMU2-K1 is arranged on the battery power supply loop.
Wherein, RACK1 and RACK2 are not shown, expressed by DC/Battery of DC side, and are connected with the switch power supply SMPS; the SMPS is also connected to an AC side AC, and a switch Q1 is provided on a loop to which the SMPS is connected.
In this embodiment, the power of SMPS, CMU, PCS is supplied by DC/Battery at the AC side when AC is abnormal, and the energy storage system starts to operate.
As shown in fig. 3, after the energy storage system starts to operate, the CMU starts fault mode detection, and performs protection action on the battery based on the principle of priority of battery power shortage protection.
When the CMU detects that the AFE communication in the current RACK is abnormal and the effective voltage number is 0, the CMU turns off the K2 switch, and the energy storage system is stopped.
The CMU detects that the lowest cell voltage is less than 2.3V and there is a discharge current or voltage that is continuously decreasing and that is longer than 30 minutes in duration, then the CMU turns off the K1 switch.
The CMU1 judges that the RACK1 is in a first power-deficient state at the initial stage of power deficiency according to the battery state information of the RACK1, the CMU1-K1 is disconnected, the RACK1 does not supply power to the CMU1 and the PCS1 any more, meanwhile, the power-deficiency indication information of the RACK1 is output, and a user is prompted to perform power-supplementing operation on the RACK 1.
The CMU2 judges that the RACK2 is in a first power-deficient state at the initial stage of power deficiency according to the battery state information of the RACK2, the CMU2-K1 is disconnected, the RACK2 does not supply power to the CMU2 and the PCS2 any more, meanwhile, the power-deficiency indication information of the RACK2 is output, and a user is prompted to perform power-supplementing operation on the RACK 2.
The CMU detects that the lowest cell voltage is less than 2.0V and no charge current, and the duration is greater than 1min, the CMU turns off the K2 switch.
When the CMU1 judges that the RACK1 is in the second power-deficient state with serious power deficiency or the CMU2 judges that the RACK2 is in the second power-deficient state with serious power deficiency, the CMU1 or the CMU2 can control the K2 to be disconnected, the energy storage system is stopped, the power-deficient stopping information is output, and a user is prompted to contact after-sale to perform power-supplementing maintenance of the corresponding battery cluster, so that the follow-up normal operation of the battery cluster is ensured.
In this embodiment, the judgment of the CMU power failure and the processing after the power failure are more accurate and quicker, the CMU controls the on-off states of K1 and K2, and when the first power failure state at the initial stage of power failure occurs, the CMU does not directly perform system shutdown, but sends out a warning, waits for maintenance power-up operation, and when the second power failure state of serious power failure occurs, forces the system shutdown, so that the user pays attention to the power failure problem, performs timely maintenance, protects the battery based on the principle of priority of battery power failure protection, and effectively avoids the damage of the battery due to over-discharge.
The following describes a control method of an energy storage system provided in an embodiment of the present application, where the method may be applied to a battery cluster management unit of the energy storage system.
As shown in fig. 4, the control method of the energy storage system includes: step 410, step 420 and step 430.
Step 410, obtaining battery status information of the battery cluster.
Step 420, under the condition that the battery cluster is in the first power shortage state based on the battery state information of the battery cluster, controlling the first switching device corresponding to the battery cluster to be disconnected so as to stop the operation of the energy storage unit corresponding to the battery cluster, and outputting power shortage indicating information corresponding to the battery cluster so as to prompt the power supplementing operation;
step 430, under the condition that the battery cluster is in the second power shortage state based on the battery state information of the battery cluster, controlling the second switching device to be switched off so as to stop the work of the energy storage system, and outputting power shortage shutdown information of the energy storage system so as to prompt power supply maintenance.
It should be noted that, the steps 420 and 430 are performed in no sequence, when the battery cluster is determined to be in the first power-deficient state based on the battery state information of the battery cluster, the step 420 is performed, and when the battery cluster is determined to be in the second power-deficient state based on the battery state information of the battery cluster, the step 430 is performed.
According to the control method of the energy storage system, based on the principle of priority of battery power shortage protection, the first switching device of the battery power supply loop of the energy storage unit and the second switching device on the output end main loop of the energy storage system are controlled by the battery cluster management unit, judgment of power shortage faults and processing after the power shortage faults are more accurate and rapid, when a first power shortage state of the initial stage of the power shortage occurs, a power shortage supplementing indication is timely output, when a second power shortage state of serious power shortage occurs, the forced system is stopped, the power shortage faults of the battery can be timely judged, the protection action is carried out on the battery, and the service life of the energy storage system is prolonged.
In some embodiments, determining that the battery cluster is in the first power loss state based on the battery state information of the battery cluster may include:
and under the condition that the lowest single voltage of the battery cluster is smaller than a first voltage threshold value and the duration of the discharge current of the battery cluster is longer than a first target duration, determining that the battery cluster is in a first power-deficient state.
In some embodiments, determining that the battery cluster is in the second power loss state based on the battery state information of the battery cluster may include:
and under the condition that the lowest single voltage of the battery cluster is smaller than a second voltage threshold value and the duration time of no charging current in the battery cluster is longer than a second target duration time, determining that the battery cluster is in a second power-deficient state.
In some embodiments, the method of controlling an energy storage system may further include:
under the condition that the battery sampling chip of the battery cluster is abnormal in communication and the energy storage system has no effective voltage value, the second switching device is controlled to be switched off, so that the energy storage system stops working, and abnormal shutdown information of the energy storage system is output to prompt maintenance.
In some embodiments, as shown in fig. 5, the embodiment of the present application further provides an electronic device 500, including a processor 501, a memory 502, and a computer program stored in the memory 502 and capable of running on the processor 501, where the program when executed by the processor 501 implements the respective processes of the above-mentioned embodiments of the control method of the energy storage system, and the same technical effects are achieved, so that repetition is avoided and no further description is given here.
The electronic device in the embodiment of the application includes the mobile electronic device and the non-mobile electronic device described above.
The embodiment of the present application further provides a non-transitory computer readable storage medium, on which a computer program is stored, where the computer program when executed by a processor implements each process of the control method embodiment of the energy storage system, and the same technical effects can be achieved, so that repetition is avoided, and no further description is given here.
Wherein the processor is a processor in the electronic device described in the above embodiment. The readable storage medium includes computer readable storage medium such as computer readable memory ROM, random access memory RAM, magnetic or optical disk, etc.
The embodiment of the application also provides a computer program product, which comprises a computer program, and the computer program realizes the control method of the energy storage system when being executed by a processor.
Wherein the processor is a processor in the electronic device described in the above embodiment. The readable storage medium includes computer readable storage medium such as computer readable memory ROM, random access memory RAM, magnetic or optical disk, etc.
The embodiment of the application further provides a chip, the chip includes a processor and a communication interface, the communication interface is coupled with the processor, the processor is used for running a program or an instruction, implementing each process of the control method embodiment of the energy storage system, and achieving the same technical effect, so as to avoid repetition, and no redundant description is provided herein.
It should be understood that the chips referred to in the embodiments of the present application may also be referred to as system-on-chip chips, chip systems, or system-on-chip chips, etc.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element. Furthermore, it should be noted that the scope of the methods and apparatus in the embodiments of the present application is not limited to performing the functions in the order shown or discussed, but may also include performing the functions in a substantially simultaneous manner or in an opposite order depending on the functions involved, e.g., the described methods may be performed in an order different from that described, and various steps may also be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.
From the above description of the embodiments, it will be clear to those skilled in the art that the above-described embodiment method may be implemented by means of software plus a necessary general hardware platform, but of course may also be implemented by means of hardware, but in many cases the former is a preferred embodiment. Based on such understanding, the technical solutions of the present application may be embodied essentially or in a part contributing to the prior art in the form of a computer software product stored in a storage medium (such as ROM/RAM, magnetic disk, optical disk), comprising several instructions for causing a terminal (which may be a mobile phone, a computer, a server, or a network device, etc.) to perform the methods described in the embodiments of the present application.
The embodiments of the present application have been described above with reference to the accompanying drawings, but the present application is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many forms may be made by those of ordinary skill in the art without departing from the spirit of the present application and the scope of the claims, which are also within the protection of the present application.
In the description of the present application, "a first feature", "a second feature" may include one or more of the features.
In the description of the present application, the meaning of "plurality" is two or more.
In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the present application have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the application, the scope of which is defined by the claims and their equivalents.
Claims (11)
1. An energy storage system, comprising:
the energy storage units comprise battery clusters, an energy storage converter and a battery cluster management unit, wherein the battery clusters and the energy storage converter are connected in series to form a battery power supply loop, a first switching device is arranged on the battery power supply loop, and the battery cluster management unit is connected with the battery clusters and the first switching device;
the battery cluster management unit is used for controlling the first switching device to be switched off under the condition that the battery cluster is in a first power shortage state based on the battery state information of the battery cluster, so that the energy storage unit stops working, and outputting power shortage indicating information corresponding to the battery cluster to indicate power shortage operation;
a second switching device is arranged on the output end total loop of the energy storage system, and the battery cluster management unit is connected with the second switching device;
the battery cluster management unit is used for controlling the second switching device to be disconnected under the condition that the battery cluster is in a second power shortage state based on the battery state information of the battery cluster, so that the energy storage system stops working, and outputting power shortage shutdown information of the energy storage system to prompt power supply maintenance.
2. The energy storage system of claim 1, wherein the battery cluster management unit is configured to determine that the battery cluster is in the first power deficit state if it is determined that a lowest cell voltage of the battery cluster is less than a first voltage threshold and a duration of a discharge current of the battery cluster is greater than a first target duration.
3. The energy storage system of claim 1, wherein the battery cluster management unit is configured to determine that the battery cluster is in the second power-deficient state if it is determined that a lowest cell voltage of the battery cluster is less than a second voltage threshold and a duration of no charging current within the battery cluster is greater than a second target duration.
4. The energy storage system according to claim 1, wherein the battery cluster management unit is further configured to, in a case where it is determined that the battery sampling chip of the battery cluster is abnormal in communication and the energy storage system has no effective voltage value, control the second switching device to be turned off so as to stop the energy storage system, and output abnormal shutdown information of the energy storage system to prompt maintenance.
5. The energy storage system of any of claims 1-4, further comprising:
the output end of the energy storage unit is connected to the first end of the switching power supply, and the second switching device is connected with the second end of the switching power supply.
6. A control method based on the energy storage system of any one of claims 1-5, wherein the method is applied to a battery cluster management unit, the method comprising:
acquiring battery state information of a battery cluster;
under the condition that the battery cluster is in a first power shortage state based on the battery state information of the battery cluster, controlling a first switching device corresponding to the battery cluster to be switched off so as to stop the work of an energy storage unit corresponding to the battery cluster, and outputting power shortage indicating information corresponding to the battery cluster to indicate power shortage operation;
and under the condition that the battery cluster is in the second power shortage state based on the battery state information of the battery cluster, controlling the second switching device to be disconnected so as to stop the work of the energy storage system, and outputting the power shortage shutdown information of the energy storage system to prompt the power shortage maintenance.
7. The method of claim 6, wherein determining that the battery cluster is in the first power-deficient state based on battery state information of the battery cluster comprises:
and under the condition that the lowest single voltage of the battery cluster is smaller than a first voltage threshold value and the duration of the discharge current of the battery cluster is longer than a first target duration, determining that the battery cluster is in the first power shortage state.
8. The method of claim 6, wherein determining that the battery cluster is in the second power-deficient state based on battery state information of the battery cluster comprises:
and under the condition that the lowest single voltage of the battery cluster is smaller than a second voltage threshold value and the duration time of no charging current in the battery cluster is longer than a second target duration time, determining that the battery cluster is in the second power shortage state.
9. The method of any one of claims 6-8, further comprising:
and under the condition that the communication of the battery sampling chips of the battery clusters is abnormal and the energy storage system has no effective voltage value, controlling the second switching device to be disconnected so as to stop the energy storage system and outputting abnormal shutdown information of the energy storage system to prompt maintenance.
10. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor implements a method for controlling an energy storage system according to any of claims 6-9 when executing the program.
11. A non-transitory computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements a method of controlling an energy storage system according to any one of claims 6-9.
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| CN202311308744.5A CN117578641A (en) | 2023-10-09 | 2023-10-09 | Energy storage system and control method thereof |
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| CN202311308744.5A CN117578641A (en) | 2023-10-09 | 2023-10-09 | Energy storage system and control method thereof |
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