CN116247775A - Control method of energy storage system, energy storage system and energy storage equipment - Google Patents
Control method of energy storage system, energy storage system and energy storage equipment Download PDFInfo
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- CN116247775A CN116247775A CN202310289788.1A CN202310289788A CN116247775A CN 116247775 A CN116247775 A CN 116247775A CN 202310289788 A CN202310289788 A CN 202310289788A CN 116247775 A CN116247775 A CN 116247775A
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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
- H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
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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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
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Abstract
The application discloses a control method of an energy storage system, the energy storage system and energy storage equipment, wherein the method comprises the following steps: acquiring the charge state of each energy storage device in the energy storage system; acquiring a charging and discharging state of the energy storage system, wherein the charging and discharging state comprises a charging state and a discharging state; when the energy storage system is switched to a charging state, determining target energy storage equipment from the energy storage system according to the charging state of each energy storage equipment; switching to the target energy storage equipment for charging, and starting charging timing; and if the charging timing time does not reach the waiting time of the charging cutter, maintaining the current charging state. According to the technical scheme, the problem that the energy storage system is always incapable of being charged normally due to the fact that the battery pack to be charged is charged frequently due to the fact that the electric energy provided by the power supply is unstable or the electricity demand of the electric equipment is unstable is avoided in the process of switching the charging and discharging states, and the target energy storage equipment can be guaranteed to be charged continuously and normally.
Description
Technical Field
The application belongs to the technical field of energy storage, and particularly relates to a control method of an energy storage system, the energy storage system and energy storage equipment.
Background
The energy storage device not only can store electric energy, but also can supply power to other electric equipment by using the stored electric energy. In order to make the energy storage device provide more electric quantity, a main battery pack and a secondary battery pack are generally configured on the energy storage device, and the battery pack with more sufficient electric quantity in the main battery pack and the secondary battery pack is used for supplying power to electric equipment.
In the related art, when the energy storage device is connected to a power supply source in a case of supplying power to the electric device, the energy storage device is switched from a discharge state to a charge state at this time. In the process of switching the charge and discharge states of the energy storage equipment, if the electric energy provided by the power supply is unstable or the electricity demand of the electric equipment is unstable, the battery pack needing to be charged can not be normally charged all the time.
It should be noted that the information disclosed in the foregoing background section is only for enhancing understanding of the background of the present application and thus may include information that does not form the prior art that is already known to those of ordinary skill in the art.
Disclosure of Invention
The invention aims to provide a control method of an energy storage system, the energy storage system and energy storage equipment, so as to solve the problem that the energy storage equipment in the related art cannot be charged normally due to frequent switching of power supply states.
Other features and advantages of the present application will be apparent from the following detailed description, or may be learned in part by the practice of the application.
According to an aspect of embodiments of the present application, there is provided a control method of an energy storage system, the energy storage system including at least two energy storage devices, the control method including:
acquiring the charge state of each energy storage device in the energy storage system;
acquiring a charging and discharging state of the energy storage system, wherein the charging and discharging state comprises a charging state and a discharging state;
when the energy storage system is switched to a charging state, determining target energy storage equipment from the energy storage system according to the charging state of each energy storage equipment;
switching to the target energy storage equipment for charging, and starting charging timing;
and if the charging timing time does not reach the waiting time of the charging cutter, maintaining the current charging state.
In one embodiment of the present application, after the step of obtaining the charge-discharge state of the energy storage system, the control method further includes:
when the energy storage system is in a charging state, determining target energy storage equipment from the energy storage system according to the charging states of the energy storage equipment;
If the target energy storage equipment is inconsistent with the currently charged energy storage equipment, switching to the target energy storage equipment for charging, and starting charging timing;
and if the charging timing duration does not reach the charging cutter waiting duration, maintaining the current charging state.
In one embodiment of the present application, the control method further includes:
and if the target energy storage equipment is consistent with the currently charged energy storage equipment, returning to the step of acquiring the charge states of all the energy storage equipment in the energy storage system.
In one embodiment of the present application, the control method further includes:
and if the charging timing duration reaches the charging switching waiting duration, returning to the step of acquiring the charge states of all the energy storage devices in the energy storage system.
In one embodiment of the present application, after the step of obtaining the charge-discharge state of the energy storage system, the control method further includes:
when the energy storage system is switched to a discharging state, determining target energy storage equipment from the energy storage system according to the charge states of the energy storage modules;
switching to the target energy storage device for discharging; and returning to execute the step of acquiring the charge states of all the energy storage devices in the energy storage system.
In one embodiment of the present application, after the step of obtaining the charge-discharge state of the energy storage system, the control method further includes:
when the energy storage system is in a discharging state, determining target energy storage equipment from the energy storage system according to the charge states of the energy storage modules;
if the target energy storage equipment is inconsistent with the currently discharged energy storage equipment, switching to the target energy storage equipment for discharging, and returning to execute the step of acquiring the charge states of all the energy storage equipment in the energy storage system.
In one embodiment of the present application, the acquiring the charge and discharge states of the energy storage system includes:
acquiring in-place states of a charging interface and a discharging interface of each energy storage device in the energy storage system; the charging interface is used for being connected with a power supply to charge the energy storage system; the discharging interface is used for being connected with a load so as to charge the load by utilizing the power supply of the energy storage system;
determining that the charging and discharging state is a charging state when the charging interface is in a bit state and the discharging interface is in an bit-free state;
and determining that the charging and discharging state is a discharging state when the charging interface is in an unoccupied state and the discharging interface is in an in-place state.
In one embodiment of the present application, obtaining a charge-discharge state of an energy storage system includes:
acquiring in-place states of a charging interface and a discharging interface of each energy storage device in the energy storage system; the charging interface is used for being connected with a power supply to charge the energy storage system; the discharging interface is used for being connected with a load so as to charge the load by utilizing the power supply of the energy storage system;
when the charging interface and the discharging interface are in an in-place state, acquiring the total input current of the energy storage system;
when the total input current is larger than a preset current threshold value, determining that the charging and discharging state is a charging state;
and when the total input current is smaller than a preset current threshold value, determining that the charge and discharge state is a discharge state.
According to one aspect of embodiments of the present application, there is provided an energy storage system comprising at least two energy storage devices and a control module for performing the control method of the energy storage system provided by any embodiment of the present application.
According to one aspect of the embodiments of the present application, there is provided an energy storage device, including a charging interface, a discharging interface, an energy storage module, a parallel operation interface, a communication module, and a controller; the charging interface is used for connecting a power supply; the discharging interface is used for connecting a load; the parallel operation interface is used for electrically connecting the energy storage module with other energy storage devices to form an energy storage system; the communication module is used for being in communication connection with other energy storage equipment so as to receive the charge states of the other energy storage equipment; the controller is used for executing the control method of the energy storage system provided by any embodiment of the application.
In the technical scheme provided by the embodiment of the application, the control method of the energy storage system obtains the charge states of all the energy storage devices in the energy storage system and the charge and discharge states of the energy storage system, when the energy storage system is switched to the charge state, the target energy storage device is determined from the energy storage system according to the charge states of all the energy storage devices, the energy storage system is switched to the target energy storage device for charging, charging is started, charging is timed, and if the charging time duration does not reach the waiting time duration of the charging and cutting machine, the current charge state is maintained. By using the method, when the energy storage system is switched to the charging state, the target energy storage equipment can be continuously charged in the waiting time of the charging and switching machine, and then only the same operation is executed in the waiting time, so that the problem that the target energy storage equipment can be continuously and normally charged because the battery pack to be charged frequently performs charging and discharging operations due to unstable electric energy provided by the power supply source or unstable electricity demand of the electric equipment in the process of switching the charging and discharging state is avoided.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the application and together with the description, serve to explain the principles of the application. It is apparent that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained from these drawings without inventive effort for a person of ordinary skill in the art.
Fig. 1 schematically shows a block diagram of an energy storage system to which the technical solution of the present application is applied.
Fig. 2 schematically illustrates a flowchart of a method for controlling an energy storage system according to an embodiment of the present application.
Fig. 3 schematically illustrates a flowchart of a method for controlling an energy storage system according to an embodiment of the present application.
Fig. 4 schematically illustrates a flowchart of a method for controlling an energy storage system according to an embodiment of the present application.
Fig. 5 schematically illustrates a block diagram of an energy storage system according to an embodiment of the present application.
Fig. 6 schematically illustrates a block diagram of an energy storage system according to an embodiment of the present application.
Fig. 7 schematically illustrates a block diagram of an energy storage device according to an embodiment of the present application.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. However, the exemplary embodiments may be embodied in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the example embodiments to those skilled in the art.
Fig. 1 schematically shows a block diagram of an energy storage system to which the technical solution of the present application is applied.
As shown in fig. 1, the energy storage system 100 includes at least two energy storage devices 110, and in some embodiments, the energy storage system may also include a greater number of energy storage devices. The energy storage device 110 in the energy storage system 100 may utilize its stored electrical energy to power the load 200 when the energy storage system 100 is in a discharged state. The power supply 300 may also supply power to the energy storage devices 110 in the energy storage system 100 when the energy storage system 100 is in a charged state.
Fig. 2 schematically illustrates a flowchart of a control method of an energy storage system according to an embodiment of the present application, where the control method may be applied to an energy storage system according to an embodiment of the present application, for example, an energy storage system as illustrated in fig. 1.
As shown in fig. 2, the control method of the energy storage system provided in the embodiment of the present application includes steps 210 to 250, which are specifically as follows:
In particular, the energy storage system comprises at least two energy storage devices, which are devices capable of storing and releasing electrical energy, such as battery packs. The State of Charge (SOC) refers to a ratio of a current remaining capacity of the energy storage device to a capacity of the energy storage device in a fully charged State, and the State of Charge is also referred to as a remaining capacity, and a value range of the State of Charge is between 0 and 100%, and the larger the SOC, the more the current available capacity of the energy storage device is indicated. When the SOC is 0, it indicates that the electric quantity of the energy storage device is completely released, and when the SOC is 100%, it indicates that the electric quantity of the energy storage device is completely full. The current available electric quantity of each energy storage device can be seen through the charge state of each energy storage device.
Specifically, the charge and discharge states of the energy storage system include a charge state and a discharge state, where the charge state refers to a power supply supplying power to the energy storage system, so that the energy storage device in the energy storage system can store electric energy. The discharging state refers to that energy storage equipment in the energy storage system outputs electric energy stored by the energy storage equipment to a load to supply power for the load.
When acquiring the charge and discharge states of the energy storage system, the energy storage system may be in a certain charge and discharge state, for example, in a charge state or a discharge state; the energy storage system may also be switching between charge and discharge states, such as the energy storage system being switched from a charge state to a discharge state, or from a discharge state to a charge state. The switching of the charge and discharge states of the energy storage system is also called as a switching machine of the energy storage system.
In the first embodiment of the present application, according to the definition of the charge and discharge states, the charge and discharge states of the energy storage system may be determined by detecting the attribute of the device to which the energy storage system is connected. When the equipment connected with the energy storage system is a power supply, the energy storage system can be determined to be in a charging state. When the device to which the energy storage system is connected is a load, it may be determined that the energy storage system is in a discharged state. When the equipment connected with the energy storage system is changed from the power supply to the load, the energy storage system can be determined to be switched from the charging state to the discharging state. When the equipment connected with the energy storage system is changed from the load to the power supply, the energy storage system can be determined to be switched from the discharging state to the charging state.
In this embodiment of the present application, the step of obtaining the charge state of each energy storage device in the energy storage system and the step of obtaining the charge and discharge states of the energy storage system may be performed simultaneously, or may be performed in tandem.
And 230, when the energy storage system is switched to the charging state, determining target energy storage equipment from the energy storage system according to the charging states of the energy storage equipment.
Specifically, switching the energy storage system to a state of charge includes three situations: filling, discharging, cutting and filling, and starting up, cutting and filling. The charging and cutting charging refers to switching from a charging state to a charging state, which is mainly caused by the change of the energy storage device for charging in the energy storage system, for example, the energy storage device A is charged, and then switching to the energy storage device B for charging, so as to generate a charging and cutting charging state; for another example, 1 energy storage device is charged, and then the charging is switched to 2 energy storage devices to charge, so as to generate a charging state. The switching charging refers to switching from a discharging state to a charging state, which is mainly caused by a change of an attribute of a device connected to the energy storage system, for example, when the device connected to the energy storage system is changed from a load to a power supply, the switching charging state is generated. The startup and cut-charging refers to switching to a charging state immediately after the energy storage system is started, which is a state switching generated when the energy storage system is started.
When the energy storage system is charged, one energy storage device or a plurality of energy storage devices in the energy storage system are selected to charge according to the charge states of the energy storage devices in the energy storage system, so that when the energy storage system is switched to the charge state, the target energy storage device can be determined from the energy storage system according to the charge states of the energy storage devices. In a charging state, the target energy storage device is the energy storage device which receives the electric energy of the power supply to charge. For example, an energy storage device having a state of charge less than a threshold may be selected as the target energy storage device. For another example, the energy storage device with the smallest state of charge may be selected as the target energy storage device.
Step 240, switching to the target energy storage device for charging, and starting charging timing.
Specifically, after the target energy storage device is determined, the target energy storage device can be charged, and when the target energy storage device starts to be charged, charging timing is performed.
In one embodiment of the present application, when a plurality of energy storage devices are selected as target energy storage devices, when the target energy storage devices are switched to charge, the selected plurality of energy storage devices should meet a parallel charging condition, that is, when a voltage difference between the plurality of energy storage devices is smaller than a preset value, the plurality of energy storage devices can be charged in parallel. If the plurality of energy storage devices do not meet the parallel operation charging condition, the energy storage devices are preferentially switched to the energy storage devices with small charge states for charging.
And 250, if the charging time duration does not reach the waiting time duration of the charging cutter, maintaining the current charging state.
Specifically, the charging and switching waiting time length refers to the time length that the energy storage system passes from the time when the energy storage system is switched to the charging state to the time when the state switching judgment is performed next time, and when the charging timing time length does not reach the charging and switching waiting time length, the current charging state is kept unchanged, namely the judgment of the charging and discharging state switching of the energy storage system is not performed, so that the target energy storage equipment can be stably charged for a period of time.
In the technical scheme provided by the embodiment of the application, through obtaining the charge states of all the energy storage devices in the energy storage system and the charge and discharge states of the energy storage system, when the energy storage system is switched to the charge state, the target energy storage devices are determined from the energy storage system according to the charge states of all the energy storage devices, the energy storage devices are switched to charge, and charging timing is started, if the duration of the charging timing does not reach the waiting duration of the charging switching machine, the current charge state is kept, so that the target energy storage devices can continuously carry out the charge state for a certain time when the energy storage system is switched to the charge state, and therefore, when the energy storage system is switched to charge and discharge frequently, the target energy storage devices can be continuously and normally charged, and the occurrence of the condition that the charging cannot be normally carried out is effectively avoided.
Fig. 3 schematically illustrates a flowchart of a control method of the energy storage system according to an embodiment of the present application, which is a further refinement of the foregoing embodiment. As shown in fig. 3, the control method of the energy storage system provided in this embodiment includes the following steps:
The energy storage device comprises a charging interface and a discharging interface, wherein the charging interface is used for being connected with a power supply to charge the energy storage system; the discharge interface is used for being connected with a load so as to charge the load by using the power supply of the energy storage system. When the charge and discharge states of the energy storage system are obtained, the charge and discharge states of the energy storage system can be determined through the in-place states of the charge interface and the discharge interface in the energy storage system. The in-place state of an interface refers to a state that whether the interface is in operation or in use, and when one interface is in the in-place state, the interface is connected with corresponding equipment and is in the state of being in operation or in use; when an interface is in an out-of-place state, it is indicated that the interface is not connected to the corresponding device, is not in operation or in use.
The process of obtaining the charge and discharge state of the energy storage system comprises the following steps: acquiring in-place states of a charging interface and a discharging interface of each energy storage device in the energy storage system, and when the charging interface is in the in-place state and the discharging interface is in the out-of-place state, indicating that the energy storage device is connected with a power supply and is not connected with a load, so that the charging and discharging states of the energy storage system are determined to be charging states. When the charging interface is in an unoccupied state and the discharging interface is in an in-place state, the energy storage device is indicated to be connected with a load and is not connected with a power supply, so that the charging and discharging states of the energy storage system are determined to be discharging states.
In one embodiment of the present application, when both the charging interface and the discharging interface of the energy storage device are in an in-place state, it is described that the energy storage device is connected with the power supply and the load at the same time, and at this time, the energy storage system may be in a discharging state or may be in a charging state, at this time, the charging and discharging state may be further determined by the total input current of the energy storage system, and the charging and discharging state is determined by the total input current of the energy storage system and the magnitude of the preset current threshold. The preset current threshold may be preset, and if a record of the preset current threshold is reserved in the energy storage system, the preset current threshold may also be directly obtained. The preset current threshold is used to distinguish whether the total current of the energy storage system flows from outside to inside or from inside to outside, and may be, for example, 0 or-1, or may be any value set between-1A and 0A.
The specific process for determining the charge and discharge state comprises the following steps: and acquiring the total input current of the energy storage system, and when the total input current is larger than a preset current threshold value, indicating that the electric energy flows into the energy storage system from the outside, so that the charging and discharging states are determined to be the charging states. If the energy storage system is connected with the power supply and the load through different interfaces, the power supply can provide larger electric energy, and the power supply supplies power to the load and simultaneously charges the energy storage device with redundant electric energy. When the total input current is smaller than the preset current threshold, the electric energy flows from the inside of the energy storage system to the outside of the energy storage system, and at the moment, a load with larger power consumption possibly works, and the energy storage device is supplying power to the load, so that the charge and discharge states are determined to be discharge states. If the energy storage system is connected with the power supply and the load through different interfaces, the fact that the power supplied by the power supply is smaller can also be explained at the moment, the power supply is insufficient for supporting the power supply of the load with larger power consumption, and the energy storage device is required to supply power for the load at the same time.
In one embodiment of the present application, the charging and discharging state may be determined directly according to a relationship between a total input current of the energy storage system and a preset current threshold. When the total input current is larger than a preset current threshold value and a power supply is connected, the energy storage system is considered to be in a charging state; when the total input current is less than the preset current threshold, the energy storage system is considered to be in a discharge state regardless of whether the charging interface of the energy storage device is in an in-place state.
In step 320, when it is determined that the energy storage system is switched to the charged state, steps 331 to 332 are performed; when it is determined that the energy storage system is in a charged state, steps 341 to 343 are performed.
And 331, when the energy storage system is switched to a charging state, determining target energy storage equipment from the energy storage system according to the charging states of the energy storage equipment.
Specifically, the steps 331 and 332 are the same as the corresponding steps in the foregoing embodiments, and are not repeated here. In step 332, after the start of the charge timer, step 351 or step 352 is performed according to the duration of the charge timer.
In one embodiment of the present application, when the energy storage system is switched from the discharging state to the charging state, the currently discharging energy storage device may be charged first, and after the duration of charging the currently discharging energy storage device reaches the preset duration, the target energy storage device is determined from the energy storage system according to the charging state of each energy storage device, and then the energy storage system is switched to the target energy storage device to charge, and charging timing is started. After the duration of charging the currently discharged energy storage device reaches the preset duration, the electric energy provided by the current power supply can be considered to be stable, the energy storage system can enter a stable charging state and then is switched to the target energy storage device for charging, so that the charging process of the target energy storage device can be ensured to be performed stably, frequent switching of the charging and discharging states caused by unstable power supply is avoided, and the situation that the charging and discharging are immediately switched to be performed after the switching to the charging due to unstable power supply can be avoided. The preset duration should be less than the waiting duration of the charging cutter, for example, the preset duration is 2s.
Specifically, when the energy storage system is in a charging state, that is, the state switching of the energy storage system is completed, a certain energy storage device or a certain part of energy storage devices in the energy storage system are currently being charged, and at this time, a target energy storage device is determined from the energy storage system according to the charge states of the energy storage devices, for example, an energy storage device with a smaller charge state is selected as the target energy storage device.
And 342, if the target energy storage device is inconsistent with the currently charged energy storage device, switching to the target energy storage device for charging, and starting charging timing.
Specifically, the target energy storage device consistent with the currently charging energy storage device includes a difference in the specific energy storage device and a difference in the number of devices. The difference of the specific energy storage devices means that the energy storage device in the current charging is the energy storage device A, the target energy storage device is the energy storage device B, and obviously the target energy storage device is consistent with the energy storage device in the current charging. The difference in the number of devices means that the currently charging energy storage device comprises a first number of energy storage devices, the target energy storage device comprises a second number of energy storage devices, and the first number and the second number are different, then the target energy storage device is considered to be consistent with the currently charging energy storage device. When the first number is the same as the second number, if the specific energy storage equipment corresponding to the first number is inconsistent with the specific energy storage equipment corresponding to the second number, the target energy storage equipment is considered to be consistent with the currently-charged energy storage equipment; for example, the first number and the second number are both 2, the first number corresponds to energy storage device a and energy storage device B, the second number corresponds to energy storage device B and energy storage device C, and the target energy storage device is consistent with the currently charging energy storage device.
When the target energy storage device is inconsistent with the currently charged energy storage device, the current charging energy storage device is indicated to be not the energy storage device which needs to be charged urgently, so that the target energy storage device is switched to be charged, the energy storage system is equivalent to the change of the charging state, the time is needed to be counted when the target energy storage device starts to be charged, and then step 351 or step 352 is executed according to the charging time duration.
In one embodiment of the present application, a bypass is provided between the charging interface and the discharging interface in the energy storage device. When the energy storage system is likely to be connected with a load and a power supply at the same time, the power supply can supply power to the load through a bypass between the charging interface and the discharging interface, and meanwhile, the power supply charges the target energy storage device through the charging interface. At this time, when the power supply is switched to the target energy storage equipment for charging, a target current request can be sent to the power supply, the target current request is used for enabling the power supply to output target current to the target energy storage equipment, and the target current needs to meet the power supply requirement of a load and the power supply requirement of the target energy storage equipment at the same time, so that stable power supply energy input can be ensured when the target energy storage equipment is charged, and the condition that the energy storage system is frequently subjected to charge and discharge state switching due to too small electric energy provided by the power supply is avoided.
Specifically, when the target energy storage device is consistent with the currently charging energy storage device, it indicates that the currently charging energy storage device is already the energy storage device to be charged, and the energy storage device does not need to be switched, so the process returns to step 310 to acquire the next state of charge and the next state of charge.
According to the technical scheme provided by the embodiment of the application, when the target energy storage equipment is inconsistent with the currently charged energy storage equipment, the target energy storage equipment is switched to charge; when the target energy storage equipment is consistent with the currently charged energy storage equipment, the currently charged energy storage equipment is kept unchanged, so that the charged energy storage equipment is always the target energy storage equipment which is required to be charged urgently, and the energy storage equipment with small charge state in the energy storage system can be effectively guaranteed to be charged in time.
Specifically, when the charging time of the target energy storage device does not reach the waiting time of the charging cutter, keeping the charging state of the target energy storage device unchanged, namely continuously charging the target energy storage device; and returning to the step 310 to acquire the next charge state and charge-discharge state when the charge duration of the target energy storage device reaches the charge-cut waiting duration.
In this embodiment of the present application, in step 310, the state of charge of each energy storage device in the energy storage system is obtained according to a certain sampling period, so as to ensure that the target energy storage device can continuously charge for a period of time, the waiting time of the charging and cutting machine should be longer than the sampling period for obtaining the state of charge of the energy storage device, for example, the sampling period is 2s, and the waiting time of the charging and cutting machine is 30s.
According to the embodiment of the application, the target energy storage equipment can be guaranteed to be charged continuously for a period of time by setting the waiting time of the charging cutter, and the situation that the charging and discharging states of the energy storage system are frequently switched to enable the target energy storage equipment to be incapable of being charged normally when a power supply is unstable (such as the power supply adopts photovoltaic power supply) or a load demand is unstable (such as the load is frequently connected and disconnected with the energy storage equipment) is avoided.
Fig. 4 schematically illustrates a flowchart of a control method of the energy storage system according to an embodiment of the present application, where the above embodiment is further refined. As shown in fig. 4, the control method of the energy storage system provided in the embodiment of the application includes the following steps:
Specifically, the steps 410 and 420 are the same as the corresponding steps in the foregoing embodiments, and are not repeated here. In step 420, when it is determined that the energy storage system is switched to the charging state, steps 431 to 432 are performed; when it is determined that the energy storage system is in a charged state, steps 441 to 444 are performed; when it is determined that the energy storage system is switched to the discharge state, steps 461 to 462 are performed; when it is determined that the energy storage system is in the discharge state, steps 471 to 473 are performed.
And step 441, determining a target energy storage device from the energy storage system according to the charge states of the energy storage devices when the energy storage system is in the charge state.
Specifically, steps 431 and 452 are the same as the corresponding steps in the foregoing embodiments, and are not described herein.
Specifically, switching the energy storage system to the discharge state includes three situations: cutting, charging, cutting and starting. The discharging and cutting discharging is switched from a discharging state to a discharging state, which is mainly caused by the change of the energy storage device which discharges in the energy storage system, for example, the energy storage device A is originally discharging, and then is switched to the energy storage device B to discharge, so as to generate a discharging and cutting discharging state; for another example, 1 energy storage device is discharging, and then switching to 2 energy storage devices to discharge, so as to generate a discharging and cutting state. The charging and discharging is switched from a charging state to a discharging state, which is mainly caused by the change of the attribute of the equipment connected with the energy storage system, for example, when the equipment connected with the energy storage system is changed from a power supply to a load, the charging and discharging state is generated. The power-on switching refers to switching to a discharging state immediately after the power-on of the energy storage system, which is a state switching generated when the energy storage system is powered on.
When the energy storage system discharges, the energy storage equipment which usually discharges has enough electric quantity, namely the target energy storage equipment needs to have certain electric quantity, so when the target energy storage equipment is determined from the energy storage system according to the charge states of all the energy storage modules, the energy storage equipment with the charge states larger than a threshold value can be selected as the target energy storage equipment; or selecting the energy storage device with the largest charge state as the target energy storage device.
Specifically, when discharging, the waiting time of the cutting machine is not required, so after the target energy storage device is switched to discharge, the process returns to step 410, so that the next charge state and the next charge and discharge state can be acquired conveniently.
And 471, determining target energy storage equipment from the energy storage system according to the charge states of the energy storage modules when the energy storage system is in a discharge state.
Specifically, when the energy storage system is in a discharging state, that is, the state switching of the energy storage system is completed, a certain energy storage device or a certain part of energy storage devices in the energy storage system are currently being discharged, and at this time, a target energy storage device is determined from the energy storage system according to the charge states of the energy storage devices, for example, an energy storage device with a larger charge state is selected as the target energy storage device.
Specifically, when the target energy storage device is inconsistent with the currently discharging energy storage device, the state of charge of the currently discharging energy storage device is indicated to be reduced, and enough electric energy cannot be continuously output in the follow-up process, so that the target energy storage device with a larger state of charge is switched to discharge so as to ensure that enough electric energy is output. After switching to the target energy storage device for discharging, the process returns to step 410, so as to obtain the next state of charge and the charge-discharge state.
Step 473, if the target energy storage device is consistent with the currently discharging energy storage device, returning to step 410.
Specifically, when the target energy storage device is consistent with the currently discharging energy storage device, the discharging energy storage device needs to be switched, and at this time, step 410 is returned to facilitate the acquisition of the next state of charge and the charge-discharge state.
In the technical scheme provided by the embodiment of the application, when the energy storage system is switched to the charging state, the next charging state and the next charging and discharging state are acquired when the charging timing of the target energy storage device reaches the waiting time of the charging and switching machine; when the energy storage system is in or switched to a discharging state, the next charge state and the next charge-discharge state can be acquired after the energy storage system is switched to the target energy storage device to discharge. The method comprises the steps that the time length of switching the energy storage system to the charging state is the waiting time length of charging and switching the energy storage system to the discharging state, the time length of switching the energy storage system to the charging state is the sampling period of the charging state of the energy storage device, and the waiting time length of charging and switching the energy storage system is longer than the sampling period of the charging state of the energy storage device, namely the time length of charging and switching the energy storage system is longer than the time length of discharging and switching the energy storage system, so that the target energy storage device can be charged continuously for a period of time in the charging state, and repeated switching is avoided; the discharging operation of the target energy storage device in the discharging state is not influenced, and because the load is possibly larger during discharging and the required discharging power is larger, the possible discharging time is faster, so that the smaller discharging switching-off time length can effectively ensure that the target energy storage device for discharging operation can output enough electric energy.
By way of example, the implementation of the technical solution of the present application will be described below by taking an example in which the energy storage system includes two energy storage devices. FIG. 5 schematically illustrates a block diagram of an energy storage system provided in one embodiment of the present application, as illustrated in FIG. 5, the energy storage system 500 includes two energy storage devices 510, one of the energy storage devices 510 including a battery pack A, which is designated as the primary pack; another energy storage device 510 includes a battery pack B, which is denoted as a slave pack. The energy storage device further comprises a charging interface for connection to a power supply and a discharging interface (not shown in fig. 5) for connection to a load.
In the related art, when the energy storage device is discharged, if a power supply is connected, the main control chip of the energy storage device can judge whether the energy storage device is in a charging state or a discharging state at the moment, if the energy storage device is in the charging state, the secondary package which is currently in the discharging state is charged (because the secondary package is currently connected to P+/P-, the secondary package) firstly, and the charging state can be considered to be stable when the secondary package is continuously connected for more than 2 seconds, and the secondary package is switched to a battery package with low electric quantity, namely a main package for charging. If the battery pack is in a discharging state, the battery pack is switched to a battery pack with high electric power, and then the battery pack is discharged.
The reason that the charging of the main package which cannot be switched to the low power state occurs and the main package and the slave package of the parallel operation are always switched back and forth between charging and discharging is found by analysis:
when the energy storage device is connected with a load and discharges the load, the slave package with high electricity can be started to discharge the load due to the fact that the electricity of the master package is low and the electricity of the slave package is high. When the energy storage device is connected with the power supply, the charging current provided by the power supply is unstable, and the power consumption condition of the load connected with the energy storage device is uncertain, so that even if the power supply is connected, the energy storage device is still in a discharging state because the charging current provided by the power supply is smaller, or the required power of the load is larger. When the charging current provided by the power supply is increased or the required power of the load is reduced, the charging state is switched to, and the secondary package currently in discharge is charged at the moment, and the secondary package can be considered to be in a stable charging state after a period of time (such as 2 seconds) is prolonged, and then the primary package with low electric quantity is charged.
However, due to the influence of unstable charging current provided by the power supply (for example, the power supply is a photovoltaic power supply, the photovoltaic power supply is influenced by illumination, the fluctuation of the power supply current output to the energy storage device is large) or uncertain power consumption condition of the load (for example, the load is a blower, a user suddenly adjusts from 1 gear with the required power of 100W to 2 gear with the required power of 300W), the charging state of the energy storage device is not stable, the energy storage device jumps to the discharging state again, and the discharging is performed from the bag. Therefore, the secondary package is charged once, the secondary package is not charged once, and the charging can not be switched to the primary package with low electric quantity all the time; and the master packet and the slave packet of the parallel operation are always switched back and forth between charging and discharging, so that the normal operation of charging is affected.
The technical solution of the present application may solve the above technical problems, and the implementation process of the control method of the energy storage system provided in the embodiment of the present application includes:
s1, acquiring SOCs of a master packet and a slave packet.
S2, acquiring the in-place state of the charging interface of the master packet and the in-place state of the charging interface of the slave packet so as to judge whether the energy storage system is connected with a power supply or not.
S3, when at least one of the master pack charging interface and the slave pack charging interface is in an in-place state, acquiring a charging and discharging state of the energy storage system. At this time, the charge and discharge states of the energy storage system can be judged according to the magnitude relation between the total input current of the energy storage system and the preset current threshold, and the total input current is the current flowing from the load or the power supply end to P+ in fig. 5. According to the charge and discharge states of the energy storage system, when the energy storage system is switched to the charge state or is in the charge state, executing S4-S6; when the energy storage system is switched to a discharge state or in a discharge state, S7 is performed.
And S4, when the energy storage system is switched to a charging state or is in the charging state, selecting a battery pack with smaller SOC for charging according to the SOCs of the master pack and the slave pack, and starting charging timing.
And S5, when the charging timing time does not reach the waiting time of the charging cutter, the current charging state is maintained. In the waiting time of the charging and switching machine, the energy storage system keeps the current charging state, and whether the current SOC of each battery pack changes or not is not considered, namely the size of the SOC of the master pack and the size of the SOC of the slave pack are not compared, the battery packs are not switched, and the current charging state is always kept. For example, if the waiting time of the charging cutter is 30s, the charging state of the target energy storage device is always maintained within 30 s.
S6, when the charging time length reaches the waiting time length of the charging and cutting machine, returning to execute S1-S3, acquiring the charging and discharging state of the energy storage equipment again, if the charging state is still in the charging state, continuously selecting a battery pack with smaller SOC according to the SOC of the current main pack and the secondary pack for charging, or when the battery pack meets the parallel charging condition, carrying out parallel charging on the battery packs meeting the condition, wherein the parallel charging condition means that the voltage difference between the newly-incorporated battery pack and the charged battery pack is smaller than a preset value, and entering the cutting machine waiting time again after the cutting machine operation, and sequentially cycling.
And S7, when the energy storage system is switched to a discharging state or is in the discharging state, the battery pack with larger SOC is selected to discharge according to the SOCs of the master pack and the slave pack, at the moment, the waiting time of the cutting machine is not required to be set, the execution S1-S3 is returned, and the energy storage system can judge the charging and discharging states again according to the normal sampling period. For example, if the sampling period is 2S, the energy storage system re-acquires the SOC of the master-slave packet after 2S, and performs charge-discharge state judgment, and if the SOC is still in the discharge state, S7 is executed; if the state of charge is switched, S4-S6 are performed.
In an embodiment of the present application, the energy storage system may also set a discharging cutter waiting period when discharging, where the discharging cutter waiting period is less than the charging cutter waiting period, so as to ensure that charging can be performed stably.
It should be noted that, in the present application, when the power supply and the load are connected to the energy storage system 500 at the same time, the power supply may directly supply power to the load through the bypass function of the energy storage system 500, and when the output power of the power supply can meet the required power of the load connected to the energy storage system 500, the redundant output power of the power supply may charge one or more energy storage devices 510 in the energy storage system 500. When the power supply fails to meet the load demand, one or more energy storage devices 510 in the energy storage system 500 are required to output a power supplement to power the load in a power supply plus energy storage device 510 mode.
In this application technical scheme, owing to set up different cutter latency for charging and discharging, battery package cutter latency when charging is longer, consequently, can make charging last and judge again after carrying out certain time whether cut the machine, can avoid the emergence of repeated cutter, can make the main package that the electric quantity is low last to charge moreover. In the discharging process, the load is possibly larger, and the required discharging power is larger, so that the possible discharging time is faster, and therefore, the switching judging time is shorter than that in the charging state in the discharging state.
Fig. 6 schematically illustrates a block diagram of an energy storage system according to an embodiment of the present application.
As shown in fig. 6, the energy storage system 600 provided in the embodiments of the present application includes at least two energy storage devices 610 and a control module 620, where the control device 610 is configured to implement the control method of the energy storage system provided in any embodiment of the present application. Specific details of the control method of the energy storage system provided in each embodiment of the present application have been described in the corresponding embodiments, and are not described herein again.
Fig. 7 schematically illustrates a block diagram of an energy storage device according to an embodiment of the present application.
As shown in fig. 7, the energy storage device 700 provided in the embodiment of the present application includes a charging interface 710, a discharging interface 720, an energy storage module 730, a parallel operation interface 740, a communication module 750, and a controller 760, where the charging interface 710 is used to connect to a power supply; the discharge interface 720 is used for connecting a load; the parallel interface 740 is used for electrically connecting the energy storage module 730 with other energy storage devices to form an energy storage system; the communication module 750 is configured to perform communication connection with other energy storage devices to receive charge states of the other energy storage devices; the controller 760 is configured to perform the method of controlling the energy storage system provided in any of the embodiments of the present application. Specific details of the control method of the energy storage system provided in each embodiment of the present application have been described in the corresponding embodiments, and are not described herein again.
In one embodiment of the present application, the energy storage module 730 in the energy storage device 700 may be independent of other modules, and the energy storage module 730 may be connected to other modules in the energy storage device 700 through a Hub (Hub).
Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the application following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the application pertains.
It is to be understood that the present application is not limited to the precise arrangements and instrumentalities shown in the drawings, which have been described above, and that various modifications and changes may be effected without departing from the scope thereof. The scope of the application is limited only by the appended claims.
Claims (10)
1. A method of controlling an energy storage system, the energy storage system comprising at least two energy storage devices, the method comprising:
acquiring the charge state of each energy storage device in the energy storage system;
acquiring a charging and discharging state of the energy storage system, wherein the charging and discharging state comprises a charging state and a discharging state;
When the energy storage system is switched to a charging state, determining target energy storage equipment from the energy storage system according to the charging state of each energy storage equipment;
switching to the target energy storage equipment for charging, and starting charging timing;
and if the charging timing time does not reach the waiting time of the charging cutter, maintaining the current charging state.
2. The control method according to claim 1, characterized in that after the step of acquiring the charge-discharge state of the energy storage system, the control method further comprises:
when the energy storage system is in a charging state, determining target energy storage equipment from the energy storage system according to the charging states of the energy storage equipment;
if the target energy storage equipment is inconsistent with the currently charged energy storage equipment, switching to the target energy storage equipment for charging, and starting charging timing;
and if the charging timing duration does not reach the charging cutter waiting duration, maintaining the current charging state.
3. The control method according to claim 2, characterized in that the control method further comprises:
and if the target energy storage equipment is consistent with the currently charged energy storage equipment, returning to the step of acquiring the charge states of all the energy storage equipment in the energy storage system.
4. The control method according to claim 1 or 2, characterized in that the control method further comprises:
and if the charging timing duration reaches the charging switching waiting duration, returning to the step of acquiring the charge states of all the energy storage devices in the energy storage system.
5. The control method according to claim 1, characterized in that after the step of acquiring the charge-discharge state of the energy storage system, the control method further comprises:
when the energy storage system is switched to a discharging state, determining target energy storage equipment from the energy storage system according to the charge states of the energy storage modules;
switching to the target energy storage device for discharging; and returning to execute the step of acquiring the charge states of all the energy storage devices in the energy storage system.
6. The control method according to claim 5, characterized in that after the step of acquiring the charge-discharge state of the energy storage system, the control method further comprises:
when the energy storage system is in a discharging state, determining target energy storage equipment from the energy storage system according to the charge states of the energy storage modules;
if the target energy storage equipment is inconsistent with the currently discharged energy storage equipment, switching to the target energy storage equipment for discharging, and returning to execute the step of acquiring the charge states of all the energy storage equipment in the energy storage system.
7. The control method according to claim 1, wherein the acquiring the charge and discharge state of the energy storage system includes:
acquiring in-place states of a charging interface and a discharging interface of each energy storage device in the energy storage system; the charging interface is used for being connected with a power supply to charge the energy storage system; the discharging interface is used for being connected with a load so as to charge the load by utilizing the power supply of the energy storage system;
determining that the charging and discharging state is a charging state when the charging interface is in a bit state and the discharging interface is in an bit-free state;
and determining that the charging and discharging state is a discharging state when the charging interface is in an unoccupied state and the discharging interface is in an in-place state.
8. The control method of claim 1, wherein obtaining a charge-discharge state of the energy storage system comprises:
acquiring in-place states of a charging interface and a discharging interface of each energy storage device in the energy storage system; the charging interface is used for being connected with a power supply to charge the energy storage system; the discharging interface is used for being connected with a load so as to charge the load by utilizing the power supply of the energy storage system;
when the charging interface and the discharging interface are in an in-place state, acquiring the total input current of the energy storage system;
When the total input current is larger than a preset current threshold value, determining that the charging and discharging state is a charging state;
and when the total input current is smaller than a preset current threshold value, determining that the charge and discharge state is a discharge state.
9. An energy storage system, characterized in that the energy storage system comprises at least two energy storage devices and a control module for performing the control method of the energy storage system according to any of claims 1-8.
10. The energy storage device is characterized by comprising a charging interface, a discharging interface, an energy storage module, a parallel operation interface, a communication module and a controller; the charging interface is used for connecting a power supply; the discharging interface is used for connecting a load; the parallel operation interface is used for electrically connecting the energy storage module with other energy storage devices to form an energy storage system; the communication module is used for being in communication connection with other energy storage equipment so as to receive the charge states of the other energy storage equipment; the controller is configured to perform a method of controlling an energy storage system according to any one of claims 1-8.
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| CN116846047A (en) * | 2023-09-01 | 2023-10-03 | 杭州协能科技股份有限公司 | Battery cluster parallel system and control method and device for charging and discharging processes of battery cluster parallel system |
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| CN116846047A (en) * | 2023-09-01 | 2023-10-03 | 杭州协能科技股份有限公司 | Battery cluster parallel system and control method and device for charging and discharging processes of battery cluster parallel system |
| CN116846047B (en) * | 2023-09-01 | 2023-11-14 | 杭州协能科技股份有限公司 | Battery cluster parallel system and control method and device for charging and discharging processes of battery cluster parallel system |
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