CN117439145A - Control method of energy storage system, energy storage system and computer readable storage medium - Google Patents
Control method of energy storage system, energy storage system and computer readable storage medium Download PDFInfo
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- CN117439145A CN117439145A CN202311659131.6A CN202311659131A CN117439145A CN 117439145 A CN117439145 A CN 117439145A CN 202311659131 A CN202311659131 A CN 202311659131A CN 117439145 A CN117439145 A CN 117439145A
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- 238000004590 computer program Methods 0.000 claims description 3
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00302—Overcharge protection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00306—Overdischarge protection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
- H02J7/007182—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery voltage
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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
- H02J2207/00—Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J2207/20—Charging or discharging characterised by the power electronics converter
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The application provides a control method of an energy storage system, the energy storage system and a computer readable storage medium, and belongs to the technical field of battery protection. The method is applied to a controller in an energy storage system and comprises the following steps: obtaining the maximum voltage and the minimum voltage of the battery cells in the battery cluster, and determining the current charge and discharge states of the energy storage system according to the preset running power of the energy storage system; the controller determines whether the battery cell is overcharged or overdischarged according to the maximum voltage, the minimum voltage, a preset voltage boundary value and the current charge and discharge state; if the over-charge or over-discharge exists, the controller determines the correction power according to the maximum voltage or the minimum voltage, a preset voltage boundary value and a power adjustment coefficient; the output power of the ac-dc conversion module is determined based on the modified power. The energy storage system reliability and safety can be improved, and the service life of the energy storage system can be prolonged.
Description
Technical Field
The present disclosure relates to the field of battery protection technologies, and in particular, to a control method of an energy storage system, and a computer readable storage medium.
Background
In recent years, with the increase of population, the increase of electricity demand market and the increasing perfection of electricity mechanism, the energy storage industry has come to have great development opportunities. The distributed energy storage system is used as an important technical support of a novel distributed intelligent power grid, the hidden danger problem of the battery cell in the operation process of the energy storage system is mainly overcharge and overdischarge, and the operation reliability of the energy storage system is improved to be a hot spot of the current energy storage system research on the premise of ensuring the use safety of the battery cell in the operation process of the energy storage system.
At present, three main approaches for preventing the overcharge or overdischarge of the battery cells in the energy storage system are as follows: the first is to set a protection voltage in the battery management module, and when the charging or discharging voltage of the battery reaches the corresponding protection voltage, the battery management module performs power-off protection on the energy storage system; the second is to coat the battery core of the energy storage system with materials to improve the overcharge or overdischarge resistance of the battery core; and thirdly, the energy storage system is provided with a special matched charging device, so that the probability of overcharge and overdischarge is reduced.
However, when the overcharge or overdischarge of the battery in the energy storage system is managed based on the prior art, the problem of neglecting the low-power charge and the low-power discharge exists, so that the overcharge or overdischarge of the battery occurs in a low-power scene, the reliability of the energy storage system is reduced, the safety is poor, and the service life is shortened.
Disclosure of Invention
The purpose of the application is to provide a control method of an energy storage system, the energy storage system and a computer readable storage medium, which can achieve the effects of improving the reliability and the safety of the energy storage system and prolonging the service life of the energy storage system.
Embodiments of the present application are implemented as follows:
in a first aspect of embodiments of the present application, a control method of an energy storage system is provided, applied to a controller in the energy storage system, where the energy storage system includes: the energy storage control method comprises the following steps of:
obtaining the maximum voltage and the minimum voltage of the battery cells in the battery cluster, and determining the current charge and discharge states of the energy storage system according to the preset running power of the energy storage system;
the controller determines whether the battery cell is overcharged or overdischarged according to the maximum voltage, the minimum voltage, a preset voltage boundary value and the current charge and discharge state;
if the over-charge exists, the controller determines the correction power according to the maximum voltage, a preset voltage boundary value and a power adjustment coefficient; if the over-discharge exists, the controller determines the correction power according to the minimum voltage, a preset voltage boundary value and a power adjustment coefficient;
The output power of the ac-dc conversion module is determined based on the modified power.
As one possible implementation manner, the determining, by the controller, whether the battery cell is overcharged or overdischarged according to the maximum voltage, the minimum voltage, the preset voltage boundary value, and the current charge-discharge state includes:
if the current charge and discharge state is the charge state, the controller determines whether the battery cell is overcharged according to the maximum allowable charge voltage in the maximum voltage and a preset voltage boundary value;
if the current charge-discharge state is a discharge state, the controller determines whether the battery cell is overdischarged or not according to the minimum allowable discharge voltage in the minimum voltage and a preset voltage boundary value.
As one possible implementation manner, the determining, by the controller, whether the battery cell is overcharged or overdischarged according to the maximum voltage, the minimum voltage, the preset voltage boundary value, and the current charge-discharge state includes:
if the maximum voltage is greater than or equal to the maximum allowable charging voltage, determining that the battery cell is overcharged;
and if the minimum voltage is smaller than or equal to the minimum allowable discharge voltage, determining that the battery cell is overdischarged.
As one possible implementation manner, the controller determines the correction power according to the maximum voltage, a preset voltage boundary value and a power adjustment coefficient, including:
Determining a first difference value between the maximum allowable charging voltage and the maximum voltage in preset voltage boundary values;
and taking the product of the first difference value and the power adjustment coefficient as the correction power.
As one possible implementation manner, the controller determines the correction power according to the minimum voltage, the preset voltage boundary value and the power adjustment coefficient, including:
determining a second difference value between the minimum allowable discharge voltage and the minimum voltage in the preset voltage boundary value;
and taking the product of the second difference value and the power adjustment coefficient as the correction power.
As a possible implementation manner, the energy storage control method further includes:
and if the corrected power exceeds the preset threshold range, determining the output power of the alternating current-direct current conversion module according to the preset threshold.
As a possible implementation manner, after obtaining the maximum voltage and the minimum voltage of the battery cells in the battery cluster and determining the current charge and discharge state of the energy storage system according to the preset operating power of the energy storage system, the method includes:
if the current charge and discharge state is a dormant state, the minimum voltage is smaller than or equal to the difference value between the minimum allowable discharge voltage and the preset voltage threshold, and the accumulated discharge duration reaches the preset time threshold, determining that the battery core is deeply overdischarged, and controlling a direct current side switch in the energy storage system to be disconnected by the controller.
As one possible implementation manner, determining the current charge and discharge state of the energy storage system according to the preset operating power of the energy storage system includes:
if the preset energy storage system running power is greater than zero, determining that the current charge and discharge state is a charge state;
if the preset energy storage system running power is smaller than zero, determining that the current charge and discharge state is a discharge state;
and if the preset operation power of the energy storage system is equal to zero, determining that the current charge and discharge state is a dormant state.
In a second aspect of the embodiments of the present application, there is provided a computer readable storage medium storing a computer program, which when executed by a processor implements the energy storage control method of the first aspect.
In a third aspect of embodiments of the present application, there is provided an energy storage system comprising: the controller, the ac-dc conversion module, and the battery cluster according to the first aspect;
the input end of the controller is connected with one end of the battery cluster, the output end of the controller is connected with the input end of the alternating current-direct current conversion module, and the output end of the alternating current-direct current conversion module is connected with the other end of the battery cluster;
the controller is used for controlling the output power of the AC-DC conversion module according to the maximum voltage, the minimum voltage, the preset voltage boundary value and the power regulation coefficient of the battery cluster, and regulating the charge and discharge states of the battery cluster through the AC-DC conversion module.
The beneficial effects of the embodiment of the application include:
according to the control method of the energy storage system, the voltage of the battery cells in the battery cluster is collected in real time through the battery management module, the maximum voltage or the minimum voltage of the battery cells in the battery cluster is determined based on preset time, the current charge and discharge state of the energy storage system is determined based on preset operation power of the energy storage system, whether an overcharge alarm or overdischarge alarm occurs to the battery cells in the battery cluster is determined according to the current charge and discharge state of the energy storage system, the maximum voltage or the minimum voltage of the battery cells in the battery cluster and a preset voltage boundary value, if the overcharge alarm or the overdischarge alarm exists to the battery cells in the battery cluster, correction power is determined according to the maximum voltage or the minimum voltage of the battery cells in the battery cluster, the preset voltage boundary value and a power regulation coefficient of the AC-DC conversion module, the controller sends the correction power to the AC-DC conversion module, and the AC-DC conversion module controls on-off of a DC side of a DC switch based on the correction power so that the charge and discharge state of the battery clusters is adjusted, and the battery cells in the battery cluster are separated from the overcharge alarm or the overdischarge alarm. The preset voltage boundary value comprises a maximum allowable charging voltage and a minimum allowable discharging voltage, when the energy storage system is in a charging state, the maximum voltage of the battery core is compared with the maximum allowable charging voltage, and if the battery core generates an overcharge alarm, the overcharge correction power is determined according to the maximum voltage of the battery core, the maximum allowable charging voltage and the power adjustment coefficient; when the energy storage system is in a discharge state, comparing the minimum voltage of the battery core with the minimum allowable discharge voltage, and if the battery core generates an over-discharge alarm, determining over-discharge correction power according to the minimum voltage of the battery core, the minimum allowable discharge voltage and the power adjustment coefficient; when the energy storage system is in a dormant state, the running power of the energy storage system is sent to an alternating current-direct current conversion module; therefore, the problem of energy storage system loss caused by neglecting low-power charging and low-power discharging can be effectively avoided. Therefore, the effects of improving the reliability and safety of the energy storage system and prolonging the service life of the energy storage system can be achieved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered limiting the scope, and that other related 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 energy storage system according to an embodiment of the present application;
fig. 2 is a flowchart of a first method for controlling an energy storage system according to an embodiment of the present application;
FIG. 3 is a flowchart of a second method for controlling an energy storage system according to an embodiment of the present disclosure;
FIG. 4 is a logic flow diagram for controlling overcharge and overdischarge according to an embodiment of the present disclosure;
fig. 5 is a flowchart for controlling overcharge and overdischarge power correction according to an embodiment of the present application;
FIG. 6 is a logic flow diagram for controlling deep over-put according to an embodiment of the present disclosure;
fig. 7 is a flowchart of a third method for controlling an energy storage system according to an embodiment of the present application.
The attached drawings are identified: 10: an alternating current grid; 20: an energy management system; 101: an alternating current switch; 102: an ac-dc conversion module; 103: a DC switch; 104: a battery cluster; 105: a controller; 106: and a battery management module.
Detailed Description
For the purposes of making the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of 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, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, which are generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present application, as provided in the accompanying drawings, is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
At present, three main approaches for preventing the overcharge or overdischarge of the battery cells in the energy storage system are as follows: the first is to set a protection voltage in the battery management module, and when the charging or discharging voltage of the battery reaches the corresponding protection voltage, the battery management module performs power-off protection on the energy storage system; the second is to coat the battery core of the energy storage system with materials to improve the overcharge or overdischarge resistance of the battery core; and thirdly, the energy storage system is provided with a special matched charging device, so that the probability of overcharge and overdischarge is reduced. However, when the energy storage system is charged or discharged based on the above scheme, the output power of the ac-dc conversion module is not adjusted, which causes the problem of neglecting low-power charging and low-power discharging, so that the battery is over-discharged due to low-power charging or the battery management module is deficient due to low-power over-charging.
Therefore, the embodiment of the application provides an energy storage control method, the maximum voltage and the minimum voltage of the electric core in the battery cluster in the energy storage system are collected through the battery management module, the charge and discharge state of the energy storage system is determined according to the preset running power of the energy storage system, the current ideal charge and discharge state of the electric core in the battery cluster is determined according to the charge and discharge state of the energy storage system, the over-charge or over-discharge alarm of the electric core is determined according to the comparison between the maximum voltage or the minimum voltage of the electric core and the preset voltage boundary value, when the over-charge or over-discharge alarm of the electric core is determined, the correction power is calculated according to the maximum voltage or the minimum voltage of the electric core, the preset voltage boundary value and the preset fault tolerance of the alternating current-direct current conversion module, the controller sends the correction power to the alternating current-direct current conversion device, and the alternating current-direct current conversion device controls the on-current switch to achieve the adjustment of the charge and discharge state of the battery cluster based on the correction power, so that the electric core is separated from the current alarm state, the loss of the low-power charge and discharge to the energy storage system can be effectively avoided, and the reliability, the safety of the energy storage system can be improved, and the service life of the energy storage system can be prolonged.
The energy storage control method provided in the embodiment of the present application is explained in detail below.
Fig. 1 is a schematic structural diagram of an energy storage system provided in the present application, referring to fig. 1, the energy storage system provided in the present application includes: ac switch 101, ac-dc conversion module 102, dc switch 103, battery cluster 104, controller 105, and battery management module 106. The ac power grid 10 is used for supplying power to the energy storage system, the ac switch 101 is used for switching in ac power input by the ac power grid 10, the ac-dc conversion module 102 is used for converting the switched-in ac power into dc power, the dc power is input to the battery cluster 104 for charging through the dc switch 103, the battery management module 106 is used for collecting real-time voltage of the battery cells in the battery cluster 104, the controller 105 is integrated with operation control logic of the energy storage system, the controller 105 controls the operation condition of the energy storage system based on the operation control logic and performs information interaction with other components, and the energy management system 20 is used for transmitting operation power of the energy storage system to the controller 105.
Optionally, the battery management module 106 may collect data such as voltage, current, and temperature of the battery cells in the battery cluster, and determine typical parameters of Energy storage such as SOC (State of Charge), SOE (State of Energy), SOH (State of Health), EOL (End of Life or End of Line), and RUL (Remaining Useful Life, remaining Life of the battery) according to the data such as voltage, current, and temperature of the battery cells. The SOC is used to indicate the remaining capacity of the battery, and the SOH is used to indicate the storage capacity of the battery.
Alternatively, the battery cluster 104 is an integral battery assembly formed by connecting a plurality of batteries, wherein the plurality of batteries are combined together through connectors or welding, so that the overall voltage and capacity of the energy storage system are increased, each battery is provided with an electric cell, and the battery management module 106 can collect the voltage of the electric cell in the battery cluster 104.
Optionally, the energy management system 20 issues operation power of the energy storage system to the controller 105, the controller 105 determines a current charge-discharge state of the energy storage system based on the received operation power of the energy storage system, meanwhile, controls on-off of the ac switch 101 and the dc switch 103, and sends the operation power to the ac-dc conversion module 102, the ac-dc conversion module 102 controls on-state of the dc switch 103 based on the received operation power, the battery cluster 104 enters an operation state indicated by the operation power, the battery management module 106 collects voltages of the battery cells in the battery cluster 104, and sends the voltages of the battery cells to the controller 105, the controller 105 determines whether the battery cells in the battery cluster 104 have an overcharge or overdischarge alarm based on the maximum voltage or the minimum voltage of the battery cells and the power adjustment coefficient of the ac-dc conversion module 102, and sends the correction power to the ac-dc conversion module 102, and the controller 105 controls the on-off-state of the battery cells in the battery cluster 104 based on the maximum voltage or the minimum voltage of the battery cells, and the on-off-state of the battery cells is adjusted based on the control module 102.
Fig. 2 is a flowchart of an energy storage control method provided in the present application, which may be applied to a controller 105 in an energy storage system, where the application of the energy storage control method mainly relates to the controller 105, the ac-dc conversion module 102, and the battery cluster 104 in the energy storage system. Referring to fig. 2, an embodiment of the present application provides a control method of an energy storage system, including:
s201, obtaining the maximum voltage and the minimum voltage of the battery cells in the battery cluster, and determining the current charge and discharge states of the energy storage system according to the preset running power of the energy storage system.
Optionally, the battery management module collects real-time voltages of the battery cells in the battery cluster and outputs the maximum voltage or the minimum voltage of the battery cells to the controller within a preset time, wherein the maximum voltage of the battery cells refers to the maximum voltage of the battery cells in the preset time, the minimum voltage of the battery cells refers to the minimum voltage of the battery cells in the preset time, the preset time can be five minutes, ten minutes, fifteen minutes, and the like, and the battery management module is set according to an application scene of the energy storage system, and the application is not limited in this way.
For example, if the preset time is fifteen minutes, the battery management module M in the energy storage system a collects that the maximum voltage of the battery cells in the battery cluster within fifteen minutes is 3.2V, and then the maximum voltage of the battery cells in the battery cluster is 3.2V; if the battery management module M in the energy storage system A collects that the minimum voltage of the battery cells in the battery cluster within fifteen minutes is 3.0V, the minimum voltage of the battery cells in the battery cluster is 3.0V.
Optionally, the preset operating power of the energy storage system may be set by the controller in the energy storage system, or may be set by the energy management system and issued to the controller, where the preset operating power of the energy storage system is used to indicate the current operating power of the energy storage system, and the current operating power of the energy storage system is used to indicate the current charge and discharge states of the energy storage system. It should be noted that, the current charge and discharge states of the energy storage system include: a charged state, a discharged state, and a dormant state.
S202, the controller determines whether the battery cell is overcharged or overdischarged according to the maximum voltage, the minimum voltage, a preset voltage boundary value and the current charge and discharge state.
Optionally, the preset voltage boundary value may be set by the controller and stored in the controller, or may be set manually and stored in the controller, where the preset voltage boundary value is used to indicate a boundary value of charging or discharging of the battery cluster, and the preset voltage boundary value includes a maximum allowable charging voltage and a minimum allowable discharging voltage, where the maximum allowable charging voltage and the minimum allowable discharging voltage may be set according to specifications of the batteries in the battery cluster, which is not limited in this application.
It is worth to say that, the maximum allowable charging voltage in the preset voltage boundary value is used for indicating the maximum charging voltage limit value of the battery cells in the battery cluster, and when the maximum voltage of the battery cells reaches the maximum charging voltage limit value, an overcharge alarm occurs to the battery cells in the battery cluster; and the minimum allowable discharge voltage in the preset voltage boundary value is used for indicating the minimum discharge voltage limit value of the battery cells in the battery cluster, when the minimum voltage of the battery cells reaches the minimum discharge voltage limit value, the battery cells in the battery cluster generate over-discharge alarm, and the continuous discharge can possibly cause the loss of the energy storage system.
Optionally, when the current charge and discharge state of the energy storage system is a charge state, the controller compares the maximum voltage of the battery cells in the battery cluster with the maximum allowable charge voltage in the preset voltage boundary value, so as to determine whether the battery cells are overcharged; when the current charge and discharge state of the energy storage system is a discharge state, the controller compares the minimum voltage of the battery cells in the battery cluster with the minimum allowable discharge voltage in the preset voltage boundary value, and whether the battery cells generate over-discharge alarm or not can be determined; if the current charge and discharge state of the energy storage system is the dormant state, the charge and discharge state of the battery cells in the battery cluster is not required to be judged.
S203, if the overcharge exists, the controller determines the correction power according to the maximum voltage, a preset voltage boundary value and a power adjustment coefficient; if the over-discharge exists, the controller determines the correction power according to the minimum voltage, the preset voltage boundary value and the power adjustment coefficient.
Alternatively, the power adjustment coefficient may be generated by the controller according to the specification, service life, etc. of the ac-dc conversion module, or may be manually set and input to the controller, where the power adjustment coefficient is used to characterize the proportional relationship between the correction power and the voltage of the battery cell to be adjusted, and the unit of the power adjustment coefficient may be kW/mV.
Optionally, when the controller determines that the battery cells in the battery cluster are overcharged, the controller determines an overcharged correction power according to the maximum voltage of the battery cells in the battery cluster, the maximum allowable charging voltage in a preset voltage boundary value and a power adjustment coefficient, and sends the overcharged correction power to the alternating current-direct current conversion module; when the controller determines that the battery cells in the battery cluster have over-discharge, the controller determines over-discharge correction power according to the minimum voltage of the battery cells in the battery cluster, the minimum allowable discharge voltage in a preset voltage boundary value and a power adjustment coefficient and sends the over-discharge correction power to the alternating current-direct current conversion module; when the controller determines that the battery cells in the battery cluster are not in an over-charge alarm or an over-discharge alarm, the controller sends the current running power of the energy storage system to the alternating current-direct current conversion module, so that the energy storage system runs normally.
Optionally, the correction power is used for indicating the power to be operated of the ac-dc conversion module, and the ac-dc conversion module adjusts the charge and discharge states of the battery cell under the effect of the correction power, so that the battery cell is separated from the overcharge alarm or the overdischarge alarm.
S204, determining the output power of the alternating current-direct current conversion module based on the corrected power.
Optionally, the controller sends the correction power to an ac-dc conversion module, and the ac-dc conversion module changes its own output power based on the correction power, and controls on-off of a dc side of the dc switch based on the output power, so as to adjust a charge-discharge state of the battery cluster, so that the battery cells in the battery cluster break away from an overcharge alarm or an overdischarge alarm.
It is noted that the energy management system may change the preset operating power of the energy storage system to achieve the purpose of eliminating the overcharge or overdischarge alarms of the cells in the battery cluster in the energy storage system.
In the embodiment of the application, by collecting the voltage of the battery cells in the battery cluster in real time and determining the maximum voltage or the minimum voltage of the battery cells in the battery cluster based on the preset time, the controller determines the current charge and discharge state of the energy storage system based on the preset running power of the energy storage system, determines whether the battery cells in the battery cluster generate an overcharge alarm or an overdischarge alarm according to the current charge and discharge state of the energy storage system, the maximum voltage or the minimum voltage of the battery cells in the battery cluster and the preset voltage boundary value, and determines the correction power according to the maximum voltage or the minimum voltage of the battery cells in the battery cluster, the preset voltage boundary value and the power regulation coefficient of the alternating current-direct current conversion module, and the alternating current-direct current conversion module controls the on-off of the direct current side based on the correction power to adjust the charge and discharge state of the battery cluster so that the battery cells in the battery cluster are separated from the overcharge alarm or the overdischarge alarm. The preset voltage boundary value comprises a maximum allowable charging voltage and a minimum allowable discharging voltage, when the energy storage system is in a charging state, the maximum voltage of the battery core is compared with the maximum allowable charging voltage, and if the battery core generates an overcharge alarm, the overcharge correction power is determined according to the maximum voltage of the battery core, the maximum allowable charging voltage and the power adjustment coefficient; when the energy storage system is in a discharge state, comparing the minimum voltage of the battery core with the minimum allowable discharge voltage, and if the battery core generates an over-discharge alarm, determining over-discharge correction power according to the minimum voltage of the battery core, the minimum allowable discharge voltage and the power adjustment coefficient; when the energy storage system is in a dormant state, the running power of the energy storage system is sent to an alternating current-direct current conversion module; therefore, the problem of energy storage system loss caused by neglecting low-power charging and low-power discharging can be effectively avoided. Therefore, the effects of improving the reliability and safety of the energy storage system and prolonging the service life of the energy storage system can be achieved.
In a possible implementation manner, referring to fig. 3, the operation of step S202 may specifically be:
and S301, if the current charge and discharge state is a charge state, the controller determines whether the battery cell is overcharged according to the maximum allowable charge voltage in the maximum voltage and a preset voltage boundary value.
Optionally, when the controller determines that the energy storage system is currently in a charged state, the controller determines whether an overcharge warning occurs to the cells in the battery cluster according to a magnitude relationship between a maximum voltage of the cells in the battery cluster and a maximum allowable charging voltage. It is worth to say that if the battery cell has an overcharge alarm, the charge quantity of the battery cells in the battery cluster is saturated, but the battery cells are still in a charged state.
S302, if the current charge and discharge state is a discharge state, the controller determines whether the battery cell is overdischarged or not according to the minimum allowable discharge voltage in the minimum voltage and the preset voltage boundary value.
Optionally, when the controller determines that the energy storage system is currently in a discharging state, the controller determines whether an overdischarge alarm occurs to the battery cells in the battery cluster according to a magnitude relation between a minimum voltage of the battery cells in the battery cluster and a minimum allowable discharging voltage. It is worth to say that, the battery cell has an over-discharge alarm, that is, the battery cell in the battery cluster has already discharged the electric quantity stored in the battery cell, but the battery cell still continues to discharge.
In a possible implementation manner, the operation in step S301 may specifically be:
and if the maximum voltage is greater than or equal to the maximum allowable charging voltage, determining that the battery cell is overcharged.
Optionally, when the maximum voltage of the cells in the battery cluster exceeds or approaches the maximum allowable charge voltage, then an overcharge warning is determined to exist for the cells.
For example, if the preset time is fifteen minutes, the battery management module M in the energy storage system a collects that the maximum voltage of the battery cell a in the battery cluster within fifteen minutes is 3.7V, the maximum allowable charging voltage stored in the controller P is 3.6V, and if the maximum voltage of the battery cell a in the battery cluster is 3.7V or greater than the maximum allowable charging voltage of 3.6V, it is determined that the overcharge warning exists in the battery cell a in the battery cluster.
In a possible implementation manner, the operation of step S302 may specifically be:
and if the minimum voltage is smaller than or equal to the minimum allowable discharge voltage, determining that the battery cell is overdischarged.
Optionally, when the minimum voltage of the battery cells in the battery cluster is lower than or close to the minimum allowable discharge voltage, determining that the battery cells have an overdischarge alarm.
For example, if the preset time is fifteen minutes, the battery management module M in the energy storage system a collects that the minimum voltage of the battery cell b in the battery cluster within fifteen minutes is 2.9V, the minimum allowable discharge voltage stored in the controller P is 3.0V, and the minimum voltage 2.9V of the battery cell b in the battery cluster is less than the minimum allowable discharge voltage and is 3.0V, and then determines that the over-discharge alarm exists in the battery cell b in the battery cluster.
Fig. 4 is a flowchart of operation logic for controlling overcharge and overdischarge provided in the present application, referring to fig. 4, the operation logic for controlling overcharge and overdischarge provided in the present application is as follows: the controller determines the current charge and discharge state of the energy storage system based on the preset operating power of the energy storage system, when the preset operating power of the energy storage system is greater than 0, the current charge and discharge state of the energy storage system is determined to be a charge state, if the maximum voltage of the battery cells in the battery cluster is greater than or equal to the maximum allowable charge voltage in the preset voltage boundary value, the overcharged state of the battery cells in the battery cluster is determined, otherwise, the battery cells in the battery cluster are normally charged; when the preset running power of the energy storage system is smaller than 0, determining that the current charge and discharge state of the energy storage system is a discharge state, if the minimum voltage of the battery cells in the battery cluster is smaller than or equal to the minimum allowable discharge voltage in the preset voltage boundary value, determining that the battery cells in the battery cluster have an overdischarge state, otherwise, normally discharging the battery cells in the battery cluster; when the preset running power of the energy storage system is equal to 0, the energy storage system is in a non-charging and non-discharging dormant state, and the state of the battery cells in the battery cluster is not required to be judged.
In a possible implementation manner, the operation in step S203 may specifically be:
A first difference between a maximum allowable charging voltage and a maximum voltage in a preset voltage boundary value is determined.
Optionally, the capacity of the battery cells in the battery cluster for overcharging may be determined according to a first difference between a maximum allowable charging voltage and a maximum voltage in a preset voltage boundary value.
For example, if the preset time is fifteen minutes, the battery management module M in the energy storage system a collects that the maximum voltage of the battery cell a in the battery cluster within fifteen minutes is 3.7V, the maximum allowable charging voltage stored in the controller P is 3.6V, and the maximum voltage of the battery cell a in the battery cluster is 3.7V greater than the maximum allowable charging voltage by 3.6V, then a first difference k1=3.6-3.7= -0.1V between the maximum allowable charging voltage and the maximum voltage of the battery cell a in the battery cluster.
And taking the product of the first difference value and the power adjustment coefficient as the correction power.
Optionally, the power adjustment coefficient is used for representing a proportional relation between the correction power and the cell voltage to be adjusted, and taking the product of the first difference value and the power adjustment coefficient as the overcharge correction power can effectively prevent the loss of the ac-dc conversion module from causing the energy storage system to be unable to break away from the overcharge alarm.
For example, if the first difference k1=3.6-3.7= -0.1 v= -100mV, and the power adjustment coefficient x=0.1 kW/mV of the ac-dc conversion module B is known between the maximum allowable charging voltage in the energy storage system a and the maximum voltage of the battery cells a in the battery cluster, the overcharge correction power of the battery cells a in the battery cluster is y=k1×x= -100mv×0.1 kW/mv= -10kW, and the controller P sends the overcharge correction power-10 kW to the ac-dc conversion module B.
In a possible implementation manner, the operation in step S203 may specifically be further:
and determining a second difference value between the minimum allowable discharge voltage and the minimum voltage in the preset voltage boundary values.
Optionally, the capacity of the battery cell in the battery cluster for overdischarging can be determined according to a second difference value between the minimum allowable discharge voltage and the minimum voltage in the preset voltage boundary value.
For example, if the preset time is fifteen minutes, the battery management module M in the energy storage system a collects that the minimum voltage of the battery cell b in the battery cluster within fifteen minutes is 2.9V, the minimum allowable discharge voltage stored in the controller P is 3V, and the minimum voltage 2.9V of the battery cell b in the battery cluster is less than the minimum allowable discharge voltage 3V, then a second difference k2=3-2.9=0.1v=100 mV between the minimum allowable discharge voltage and the minimum voltage of the battery cell b in the battery cluster.
And taking the product of the second difference value and the power adjustment coefficient as the correction power.
Optionally, taking the product of the second difference value and the power adjustment coefficient as the overcharge correction power can effectively prevent the loss of the ac-dc conversion module from causing the energy storage system to be unable to break away from the overdischarge alarm.
For example, if the second difference k2=3-2.9=0.1v=100 mV between the minimum allowable discharge voltage in the energy storage system a and the minimum voltage of the battery cell B in the battery cluster is known, and the power adjustment coefficient x=0.1 kW/mV of the ac/dc conversion module B, the over-discharge correction power of the battery cell B in the battery cluster is z=k2×x=100 mv×0.1 kW/mv=10 kW, and the controller P sends the over-discharge correction power 10kW to the ac/dc conversion module B.
Fig. 5 is a flowchart of a correction for controlling overcharge and overdischarge power provided in the present application, referring to fig. 5, the correction logic for controlling overcharge and overdischarge provided in the present application is as follows: when the controller determines that the battery cells in the battery cluster have an overcharge alarm, the controller calculates overcharge correction power according to the maximum voltage, the maximum allowable charge voltage and the power adjustment coefficient of the battery cells, multiplies the difference value between the maximum allowable charge voltage and the maximum voltage by the power adjustment coefficient to obtain the overcharge correction power, carries out amplitude limiting treatment on the overcharge correction power, and assigns the overcharge correction power to the AC-DC conversion module, and the AC-DC conversion module adjusts the charge and discharge states of the battery clusters based on the overcharge correction power so as to enable the battery cells in the battery clusters to be separated from the overcharge alarm; when the controller determines that the over-discharge alarm exists in the battery cell in the battery cluster, the controller calculates over-discharge correction power according to the minimum voltage, the minimum allowable discharge voltage and the power adjustment coefficient of the battery cell, multiplies the difference value of the minimum allowable discharge voltage and the minimum voltage by the power adjustment coefficient to obtain the over-discharge correction power, carries out limiting treatment on the over-discharge correction power, assigns the over-discharge correction power to the AC-DC conversion module, and adjusts the charge and discharge state of the battery cluster based on the over-discharge correction power so as to enable the battery cell in the battery cluster to deviate from the over-discharge alarm; when the controller determines that the battery cells in the battery cluster work normally, the controller assigns the running power of the preset energy storage system to the alternating current-direct current conversion module, and the alternating current-direct current conversion module continues to run based on the running power of the preset energy storage system.
As one possible implementation manner, the control method of the energy storage system further includes:
and if the corrected power exceeds the preset threshold range, determining the output power of the alternating current-direct current conversion module according to the preset threshold.
Optionally, the preset threshold is used for performing clipping processing on the correction power, the preset threshold may be a power correction limit value set by a user in a user-defined manner, may be determined according to loss of the energy storage system, or may be a threshold range set by the energy storage system according to maximum loss of an ac-dc conversion module in the energy storage system, where the preset threshold includes a range from a maximum clipping value to a minimum clipping value, the maximum clipping value is used for limiting the over-amplification correction power, and the minimum clipping value is used for limiting the over-charge correction power.
Optionally, if the over-amplification correction power is smaller than the minimum limiting value, using the minimum limiting value as the over-amplification correction power, and sending the corrected over-amplification correction power to the alternating current-direct current conversion module; and if the overcharge correction power is larger than the maximum amplitude limiting value, taking the maximum amplitude limiting value as the overcharge correction power, and transmitting the corrected overcharge correction power to the alternating current-direct current conversion module.
It is worth to be noted that, the clipping processing of the correction power by the preset threshold value can maintain the correction range of the ac-dc conversion module within a certain range, so as to ensure the safety and reliability of the energy storage system.
For example, if the first difference k1=3.6-3.7= -0.1 v= -100mV of the maximum allowable charging voltage of the battery cell a in the energy storage system a and the power adjustment coefficient x=0.1 kW/mV of the ac/dc conversion module B are known, the overcharging correction power of the battery cell a in the battery cluster is y=k1×x= -100mv×0.1 kW/mv= -10kW, and if the minimum amplitude value in the preset threshold is-3 kW, the calculated overcharging correction power-10 kW is far smaller than the amplitude limiting power-3 kW, the controller P adjusts the overcharging correction power-10 kW to-3 kW and sends the overcharging correction power to the ac/dc conversion module B.
For example, if the second difference k2=3-2.9=0.1v=100 mV between the minimum allowable discharge voltage in the energy storage system a and the minimum voltage of the battery cell B in the battery cluster is known, and the power adjustment coefficient x=0.1 kW/mV of the ac-dc conversion module B, the over-discharge correction power of the battery cell B in the battery cluster is z=k2×x=100 mv×0.1 kW/mv=10 kW, and if the maximum amplitude limit value in the preset threshold is 3kW, the calculated over-discharge correction power 10kW is far greater than the amplitude limit power 3kW, the controller P adjusts the over-charge correction power 10kW to 3kW and sends the over-charge correction power to the ac-dc conversion module B.
As a possible implementation manner, after the step S201, the method includes:
If the current charge and discharge state is a dormant state, the minimum voltage is smaller than or equal to the difference value between the minimum allowable discharge voltage and the preset voltage threshold, and the accumulated discharge duration reaches the preset time threshold, determining that the battery core is deeply overdischarged, and controlling a direct current side switch in the energy storage system to be disconnected by the controller.
Optionally, the preset voltage threshold is used for indicating whether the battery cell enters a deep discharge state, the preset time threshold is used for indicating the accumulated time length of overdischarge of the battery cell when the energy storage system is in a dormant state, if the energy storage system is in the dormant state, that is, the battery cluster is neither charged nor discharged, but the difference value between the minimum allowable discharge voltage and the preset voltage threshold is greater than or equal to the minimum voltage of the battery cell in the battery cluster, and when the accumulated discharge time length of the battery cell of the battery cluster reaches the time length indicated by the preset time threshold, the energy storage system is determined to enter a severe depletion state, the battery cell enters a deep overdischarge alarm, both the preset voltage threshold and the preset time threshold can be manually set and stored in the controller, and can also be set by the controller according to the application scene of the energy storage system, which is not particularly limited.
It should be noted that, when the energy storage system is in the sleep state, the ac-dc conversion module is also in the sleep state, that is, the ac-dc conversion module cannot correct the charge and discharge states of the battery clusters according to the correction power.
Optionally, if the energy storage system is in the sleep state, it is determined that the battery cells in the battery cluster have deep overdischarge phenomenon, the ac-dc conversion module cannot repair the deep overdischarge of the battery cells according to the correction power, the energy storage system can continuously lose, and the risk of emptying can be caused when the energy storage system is serious, and at this time, the controller can directly control the disconnection of the dc side switch, so that the battery cells in the battery cluster do not continue to lose.
Notably, the energy management system or controller may issue an obstacle clearing command or alter a preset voltage threshold such that the cells in the battery cluster are free of deep overdischarge alarms.
Fig. 6 is a flowchart of operation logic for controlling deep overdischarge provided in the present application, referring to fig. 6, the control operation logic for deep overdischarge provided in the present application is as follows: firstly, the controller judges whether the current charge and discharge state of the energy storage system is a dormant state, if not, the deep discharge condition is not satisfied; if yes, the controller further judges whether the minimum voltage of the battery cells in the battery cluster in the energy storage system is smaller than or equal to the difference value between the minimum allowable discharge voltage and the preset voltage threshold, and if not, the condition of deep discharge is not met; if so, the controller further judges the accumulated time length of the cell discharge of the battery cluster in the energy storage system, and if the accumulated time length of the discharge does not reach a preset time threshold value, the condition of deep discharge is not met; if the accumulated discharge time length reaches a preset time threshold, determining that the battery core in the energy storage system has deep overdischarge alarm, and directly controlling the direct-current side switch to be disconnected by the controller, wherein the battery core stops discharging.
In a possible implementation manner, referring to fig. 7, the operation in step S201 may specifically be:
s701, if the preset operation power of the energy storage system is greater than zero, determining that the current charge and discharge state is a charge state.
Optionally, the controller controls the charge and discharge states of the energy storage system based on the preset energy storage system operation power, the controller sends the preset energy storage system operation power to the ac-dc conversion module, and the ac-dc conversion module controls the on-off of the dc switch side according to the preset energy storage system operation power, so as to adjust the charge and discharge states of the battery clusters, so that the charge and discharge states of the battery clusters are consistent with the charge and discharge states of the energy storage system.
Optionally, the controller determines a current charging state of the energy storage system according to a preset energy storage system operating power, and determines that the energy storage system is currently in the charging state when the preset energy storage system operating power is greater than zero.
S702, if the preset operation power of the energy storage system is smaller than zero, determining that the current charge and discharge state is a discharge state.
Optionally, when the controller determines that the preset energy storage system operating power of the energy storage system is less than zero, it is determined that the energy storage system is currently in a discharge state.
S703, if the preset operation power of the energy storage system is equal to zero, determining that the current charge and discharge state is a dormant state.
Optionally, when the controller determines that the preset energy storage system operation power of the energy storage system is equal to zero, it determines that the energy storage system is currently in a state of not charging or not discharging, and the energy storage system is currently in a dormant state. It should be noted that the sleep state is used to indicate that the energy storage system is currently in a state of not being charged or discharged, i.e. the energy storage system is in a state of not being operated.
For example, if the energy storage system a is configured to send the preset energy storage system operating power to the controller P by the energy management system E, and when the preset energy storage system operating power received by the controller P is 10kW, the controller P determines that the energy storage system a is currently in a charging state, and sends the 10kW operating power to the ac-dc conversion module; when the preset energy storage system operation power received by the controller P is-10 kW, the controller P determines that the energy storage system A is in a discharging state at present, and sends the operation power of-10 kW to the alternating current-direct current conversion module; when the preset operating power of the energy storage system received by the controller P is 0kW, the controller P determines that the energy storage system a is currently in a sleep state, and sends the operating power of 0kW to the ac-dc conversion module.
In the embodiment of the application, the controller is used for judging the numerical value of the running power of the preset energy storage system of the energy storage system, determining the current charge and discharge state of the energy storage system, and judging the overcharge or overdischarge alarm of the battery cells in the battery cluster based on the current charge and discharge state of the energy storage system, so that the reliability of the energy storage system can be improved.
Table 1 is a logic for controlling charge and discharge of an energy storage system, referring to Table 1, with an AC-DC conversion module of 100kW, the efficiency is 97%, and the maximum loss is 3kW, so as to achieve overcharge and overdischarge alarms, for example, as follows:
TABLE 1 charging and discharging control operation logic for energy storage system
Optionally, the power adjustment coefficient and the limiting value of the ac-dc conversion module are parameters set by the controller, and the limiting value is a maximum loss value of the ac-dc conversion module.
Optionally, when an overcharge alarm occurs to the battery cells in the battery cluster, the positive power of the alternating current-direct current conversion module is assigned, so that the battery cells in the battery cluster enter a discharging state to reduce the voltage of the battery cells, and the overcharge alarm is disengaged; when the over-discharge alarm occurs to the battery cells in the battery cluster, the positive power of the alternating current-direct current conversion module is assigned, so that the battery cells in the battery cluster enter a charging state to increase the voltage of the battery cells, and the over-discharge alarm is separated; when the power is equal to the running loss of the AC-DC conversion module, the power is adjusted to be balanced, for example, the AC-DC conversion module is 1kW in loss, and when the over-discharge alarm occurs to the battery cells in the battery cluster, the over-discharge correction power is 1kW at the moment, and the voltage correction is realized by adjusting to be balanced.
The following describes a computer readable storage medium for executing the energy storage control method provided in the present application, and specific implementation processes and technical effects thereof are referred to above, which are not described in detail below.
The present application also provides a computer readable storage medium storing a computer program which, when executed by a processor, implements the steps of the respective method embodiments described above.
Optionally, the present application also provides a program product, such as a computer readable storage medium, comprising a program for performing any of the energy storage control method embodiments described above when being executed by a processor.
In the several embodiments provided by the present invention, it should be understood that the disclosed apparatus and method may be implemented in other manners. For example, the apparatus embodiments described above are merely illustrative, e.g., the division of elements is merely a logical functional division, and there may be additional divisions of actual implementation, e.g., multiple elements or components may be combined or integrated into another system, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or units, which may be in electrical, mechanical or other form.
The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed over a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in the embodiments of the present invention may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in hardware plus software functional units.
The integrated units implemented in the form of software functional units described above may be stored in a computer readable storage medium. The software functional unit is stored in a storage medium, and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) or a processor (english: processor) to perform part of the steps of the methods of the embodiments of the invention. And the aforementioned storage medium includes: u disk, mobile hard disk, read-Only Memory (ROM), random access Memory (Random Access Memory, RAM), magnetic disk or optical disk, etc.
The foregoing is merely a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think about changes or substitutions within the technical scope of the present application, and the changes or substitutions are covered by the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
The foregoing description is only of the preferred embodiments of the present application and is not intended to limit the same, but rather, various modifications and variations may be made by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.
Claims (10)
1. A method of controlling an energy storage system, the method comprising: the controller, the alternating current-direct current conversion module and the battery cluster, the method comprises the following steps:
obtaining the maximum voltage and the minimum voltage of the battery cells in the battery cluster, and determining the current charge and discharge states of the energy storage system according to the preset running power of the energy storage system;
the controller determines whether the battery cell is overcharged or overdischarged according to the maximum voltage, the minimum voltage, a preset voltage boundary value and the current charge and discharge state;
If the over-charge exists, the controller determines correction power according to the maximum voltage, the preset voltage boundary value and the power adjustment coefficient; if overdischarge exists, the controller determines the correction power according to the minimum voltage, the preset voltage boundary value and the power adjustment coefficient;
and determining the output power of the alternating current-direct current conversion module based on the corrected power.
2. The method of claim 1, wherein the controller determining whether the battery cell is overcharged or overdischarged according to the maximum voltage, the minimum voltage, a preset voltage boundary value, and the current charge/discharge state, comprises:
if the current charge and discharge state is a charge state, the controller determines whether the battery cell is overcharged according to the maximum voltage and the maximum allowable charge voltage in the preset voltage boundary value;
and if the current charge-discharge state is a discharge state, the controller determines whether the battery cell is overdischarged or not according to the minimum allowable discharge voltage in the minimum voltage and the preset voltage boundary value.
3. The method of claim 2, wherein the controller determining whether the battery cell is overcharged or overdischarged according to the maximum voltage, the minimum voltage, a preset voltage boundary value, and the current charge/discharge state, comprises:
if the maximum voltage is greater than or equal to the maximum allowable charging voltage, determining that the battery cell is overcharged;
and if the minimum voltage is smaller than or equal to the minimum allowable discharge voltage, determining that the battery cell is overdischarged.
4. The method of claim 2, wherein the controller determining the correction power based on the maximum voltage, the preset voltage boundary value, and a power adjustment coefficient comprises:
determining a first difference value between the maximum allowable charging voltage and the maximum voltage in the preset voltage boundary values;
and taking the product of the first difference value and the power adjustment coefficient as the correction power.
5. The method of claim 2, wherein the controller determining the correction power based on the minimum voltage, the preset voltage boundary value, and the power adjustment coefficient comprises:
Determining a second difference value between the minimum allowable discharge voltage and the minimum voltage in the preset voltage boundary value;
and taking the product of the second difference value and the power adjustment coefficient as the correction power.
6. The method of claim 4 or 5, further comprising:
and if the correction power exceeds the preset threshold range, determining the output power of the alternating current-direct current conversion module according to the preset threshold.
7. The method for controlling an energy storage system according to claim 1, wherein the obtaining the maximum voltage and the minimum voltage of the cells in the battery cluster, and determining the current charge and discharge states of the energy storage system according to the preset operating power of the energy storage system, comprises:
if the current charge and discharge state is a dormant state, the minimum voltage is smaller than or equal to the difference value between the minimum allowable discharge voltage and a preset voltage threshold, and the accumulated discharge duration reaches a preset time threshold, determining that the battery core is deeply overdischarged, and controlling a direct-current side switch in the energy storage system to be disconnected by the controller.
8. The method for controlling an energy storage system according to claim 1, wherein determining the current charge and discharge state of the energy storage system according to the preset operating power of the energy storage system comprises:
If the preset operation power of the energy storage system is greater than zero, determining that the current charge and discharge state is a charge state;
if the preset operation power of the energy storage system is smaller than zero, determining that the current charge and discharge state is a discharge state;
and if the preset operation power of the energy storage system is equal to zero, determining that the current charge and discharge state is a dormant state.
9. A computer readable storage medium, characterized in that it has stored thereon a computer program which, when executed by a processor, implements the steps of the method according to any of claims 1 to 8.
10. An energy storage system, the energy storage system comprising: the controller, ac-dc conversion module, and battery cluster of claims 1-8;
the input end of the controller is connected with one end of the battery cluster, the output end of the controller is connected with the input end of the alternating current-direct current conversion module, and the output end of the alternating current-direct current conversion module is connected with the other end of the battery cluster;
the controller is used for controlling the output power of the alternating current-direct current conversion module according to the maximum voltage, the minimum voltage, the preset voltage boundary value and the power regulation coefficient of the battery cluster, and regulating the charge and discharge states of the battery cluster through the alternating current-direct current conversion module.
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