CN114914920A - Energy storage system and control method thereof - Google Patents
Energy storage system and control method thereof Download PDFInfo
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- CN114914920A CN114914920A CN202210420467.6A CN202210420467A CN114914920A CN 114914920 A CN114914920 A CN 114914920A CN 202210420467 A CN202210420467 A CN 202210420467A CN 114914920 A CN114914920 A CN 114914920A
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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
- H02J15/00—Systems for storing electric energy
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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
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Abstract
The invention discloses an energy storage system and a control method of the energy storage system. The energy storage system includes: the main control device is electrically connected with the energy storage modules and is used for acquiring user required power, determining first distribution power corresponding to each energy storage module according to the user required power, the number of the operated energy storage modules and the charge state of energy storage units in the operated energy storage modules, determining second distribution power of each energy storage module according to the remaining power when the first distribution power is determined and the required power is surplus, and sending a power scheduling instruction to the corresponding energy storage current transformation units according to the first distribution power and the second distribution power corresponding to each energy storage module; the energy storage current transformation unit is used for charging the energy storage unit or discharging the energy storage unit according to the power scheduling instruction. According to the embodiment of the invention, under the condition of meeting the power demand of a user, the power is distributed based on the charge state of the energy storage module to finish the power balance, the calculation speed is high, and the power is more balanced.
Description
Technical Field
The invention relates to the technical field of energy storage, in particular to an energy storage system and a control method of the energy storage system.
Background
Energy storage is an important link for constructing a novel power system in the future, and along with the development of energy storage technology and the reduction of large-scale cost, the requirement of users on the energy storage system is higher and higher.
In the prior art, when the energy storage system receives the required power of a user, the energy storage system cannot quickly respond to the required power.
Disclosure of Invention
The invention provides an energy storage system and a control method of the energy storage system, which adopt a two-stage calculation strategy, complete power balance by performing power distribution based on the charge state of an energy storage module under the condition of preferentially meeting the power required by a user, and have the advantages of higher calculation speed and more balanced power distribution.
According to an aspect of the present invention, there is provided an energy storage system including:
the energy storage device comprises a main control device and at least two energy storage modules;
the main control device is electrically connected with the energy storage modules, each energy storage module comprises an energy storage converter unit and at least two energy storage units, and the energy storage converter unit in each energy storage module is electrically connected with the energy storage units;
the main control device is used for acquiring user required power, determining first distribution power corresponding to each energy storage module according to the user required power, the number of the operated energy storage modules and the charge state of energy storage units in the operated energy storage modules, determining second distribution power of each energy storage module according to the remaining power when the first distribution power is determined and the user required power is remained, and sending a power scheduling instruction to the corresponding energy storage current conversion unit according to the first distribution power and the second distribution power corresponding to each energy storage module;
the energy storage current transformation unit is used for charging the energy storage unit or discharging the energy storage unit according to the power scheduling instruction.
Optionally, the main control device is configured to determine an average state of charge of each operating energy storage module and an average state of charge of the energy storage system according to states of charge of energy storage units in the operating energy storage modules, determine a first average power according to the power required by the user and the number of the operating energy storage modules, determine a preliminary distribution power of each operating energy storage module according to the first average power, the average state of charge of each operating energy storage module, and the average state of charge of the energy storage system, and determine the first distribution power of each operating energy storage module according to the preliminary distribution power, the maximum response power of an energy storage converter unit of each operating energy storage module, and the maximum response power of an energy storage unit of each operating energy storage module.
Optionally, the master control device determines the preliminary allocated power of the nth running energy storage module based on the following formula:
and the preliminary distributed power is the first average power and the average state of charge of the nth operated energy storage module/the average state of charge of the energy storage system, wherein n is greater than or equal to 1 and less than or equal to m, and m is the number of the operated energy storage modules.
Optionally, the first distributed power is less than or equal to the smaller of the maximum response power of the energy storage variable current unit and the maximum response power of the energy storage unit.
Optionally, the main control device is configured to determine a second average power of each energy storage module according to the remaining power and the number of energy storage modules capable of performing power redistribution again, and determine the second distributed power according to a first distributed power corresponding to each energy storage module capable of performing power redistribution again, a corresponding second average power, a corresponding maximum response power of the energy storage converter unit, and a corresponding maximum response power of the energy storage unit.
Optionally, the main control device obtains the required power input by the user every a first set time, obtains the stored required power when the required power input by the user is not obtained within a second set time, and determines the stored required power as the required power of the user, where the second set time is longer than the first set time.
Optionally, the master control device further includes a first monitoring unit and a second monitoring unit;
the first monitoring unit is used for acquiring operation data of each energy storage module, judging the grade of an abnormal event when the energy storage module is determined to have the abnormal event according to the operation data, and pushing the abnormal event to the second monitoring unit when the grade of the abnormal event is a system grade;
the second monitoring unit is used for processing the abnormal event at a system level.
Optionally, the first monitoring unit is further configured to process the exception event when the exception event is a module-level event.
Optionally, the energy storage unit includes an energy storage battery and a refrigeration subunit, and the refrigeration subunit includes an air-cooled subunit or a liquid-cooled subunit.
Optionally, the operation data includes voltage of the energy storage battery, current of the energy storage battery, temperature of the energy storage battery, operation information of the energy storage converter unit, and operation information of the refrigeration subunit.
According to another aspect of the present invention, a method for controlling an energy storage system is provided, where the energy storage system includes a master control device and at least two energy storage modules; each energy storage module comprises an energy storage current transformation unit and at least two energy storage units;
the control method of the energy storage system comprises the following steps:
the method comprises the steps that a main control device obtains power required by a user, first distribution power corresponding to each energy storage module is determined according to the power required by the user, the number of operating energy storage modules and the charge state of energy storage units in the operating energy storage modules, when the first distribution power is determined and the power required by the user is surplus, second distribution power of each energy storage module is determined according to the surplus power, and power scheduling instructions are sent to the corresponding energy storage conversion units according to the first distribution power and the second distribution power corresponding to each energy storage module;
and the energy storage current transformation unit charges the energy storage unit or discharges the energy storage unit according to the power scheduling instruction.
The embodiment adopts modular management on the energy storage system, takes the energy storage module as the minimum management unit, takes the energy storage module as the minimum distribution unit during power distribution, can carry out power distribution more quickly, fully considers the charge state of each energy storage module and the number of the operated energy storage modules during the first round of power distribution, can meet the power balance of each energy storage module to a greater extent, carries out the second round of power distribution to meet the requirement of a customer when the first round of power distribution cannot complete the distribution of the power required by the customer, adopts a two-stage calculation strategy, carries out power distribution based on the charge state of the energy storage modules under the condition of preferentially meeting the power required by the customer, has higher calculation speed and more balanced power distribution, meets the requirement of completing the calculation process in linear time, and sends the power to the energy storage modules, and completing the power response.
It should be understood that the statements in this section do not necessarily identify key or critical features of the embodiments of the present invention, nor do they necessarily limit the scope of the invention. Other features of the present invention will become apparent from the following description.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic diagram of an energy storage system according to an embodiment of the present invention;
fig. 2 is a process diagram of power allocation provided by an embodiment of the present invention;
FIG. 3 is a schematic diagram of another energy storage system provided by an embodiment of the invention;
FIG. 4 is a schematic diagram of another energy storage system provided by an embodiment of the invention;
FIG. 5 is a process diagram of exception handling according to an embodiment of the present invention;
fig. 6 is a flowchart of a control method of an energy storage system according to an embodiment of the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
An embodiment of the present invention provides an energy storage system diagram, and 1 is a schematic diagram of an energy storage system provided in an embodiment of the present invention, and referring to fig. 1, the energy storage system includes:
the main control device 10 and at least two energy storage modules 20;
the main control device 10 is electrically connected with the energy storage modules 20, each energy storage module 20 comprises an energy storage converter unit 21 and at least two energy storage units 22, and the energy storage converter unit 21 in each energy storage module 20 is electrically connected with the energy storage unit 22;
the main control device 10 is configured to obtain power required by a user, determine first distribution power corresponding to each energy storage module 20 according to the power required by the user, the number of the operating energy storage modules 20, and a charge state of an energy storage unit 22 in the operating energy storage modules 20, determine second distribution power of each energy storage module 20 according to the remaining power when the first distribution power is determined and the power required by the user is remaining, and send a power scheduling instruction to a corresponding energy storage converter unit 21 according to the first distribution power and the second distribution power corresponding to each energy storage module 20;
the energy storage converter unit 21 is used for charging the energy storage unit 22 or discharging the energy storage unit according to the power scheduling instruction.
The energy storage converter unit 21 is a Power Conversion System (PCS) for performing ac-dc Conversion, for example, when the energy storage unit 22 is charged, the energy storage converter unit 21 converts ac Power into dc Power, and when the energy storage unit 22 is discharged, the energy storage converter unit 21 converts the dc Power of the energy storage unit 22 into ac Power. The energy storage unit 22 includes an energy storage battery for storing electrical energy. At least two energy storage units 22 in each energy storage module 20 may be electrically connected to the energy storage converter unit 21 after being connected in parallel. The state of charge (soc) is used to reflect the remaining capacity of the energy storage battery in the energy storage unit 22.
When a user needs to perform power scheduling on the energy storage system, the user may input or send required power to be scheduled to the main control device 10, and after the main control device 10 obtains the required power, the power is distributed to each energy storage module 20 according to the required power. After receiving the power required by the user, the main control device 10 first determines a first distribution power corresponding to each energy storage module 20 according to the power required by the user, the number of the operating energy storage modules 20, and the state of charge of the energy storage units 22 in the operating energy storage modules 20, thereby completing the first round of power distribution. And determining whether the residual power exists after the first distributed power is determined, if the residual power does not exist after the first distributed power is determined, sending a power scheduling instruction to the energy storage converter unit 21 according to the first distributed power, and charging the energy storage unit 22 corresponding to the energy storage converter unit 21 according to the power scheduling instruction or discharging the energy storage unit 22 corresponding to the energy storage converter unit.
When the remaining power still exists after the first distributed power is determined, the main control device 10 performs a second round of power distribution on the energy storage module 20 according to the remaining power, and determines a second distributed power. The exemplary master control device 10 may compare the first allocated power of each energy storage module 20 with the maximum sustainable power thereof, and if the first allocated power of the energy storage module 20 has reached the maximum sustainable power thereof, the power is not allocated again, and if the first allocated power of the energy storage module 20 is smaller than the maximum sustainable power thereof, the power is allocated again. The master control device 10 may distribute the remaining power evenly to the energy storage modules 20, which may be further distributed.
The embodiment adopts modular management on the energy storage system, takes the energy storage module as the minimum management unit, takes the energy storage module as the minimum distribution unit during power distribution, can carry out power distribution more quickly, fully considers the charge state of each energy storage module and the number of the operated energy storage modules during the first round of power distribution, can meet the power balance of each energy storage module to a greater extent, carries out the second round of power distribution to meet the requirement of a customer when the first round of power distribution cannot complete the distribution of the power required by the customer, adopts a two-stage calculation strategy, carries out power distribution based on the charge state of the energy storage modules under the condition of preferentially meeting the power required by the customer, has higher calculation speed and more balanced power distribution, meets the requirement of completing the calculation process in linear time, and sends the power to the energy storage modules, and completing the power response.
The embodiment provides that energy storage system software platform builds more easily, uses the whole energy storage system frame of energy storage system factory generation, provides the control logic scheme of a whole set of energy storage system, uses PCS equipment factory, loads the energy storage system with the PCS equipment of needs, uses energy storage unit factory, loads the energy storage system with the energy storage unit of needs. The design idea of combination can be adapted to various energy storage system schemes, so that the software function expansion is facilitated, the development period is shortened, and the product competitiveness of the system is improved.
Optionally, the main control device 10 is configured to determine an average state of charge of each operating energy storage module 20 and an average state of charge of the energy storage system according to the state of charge of the energy storage units 22 in the operating energy storage modules 20, determine a first average power according to the power required by the user and the number of the operating energy storage modules 20, determine a preliminary distribution power of each operating energy storage module 20 according to the first average power, the average state of charge of each operating energy storage module 20, and the average state of charge of the energy storage system, and determine a first distribution power of each operating energy storage module according to the preliminary distribution power, the maximum response power of the energy storage converter unit of each operating energy storage module 20, and the maximum response power of the energy storage unit of each operating energy storage module.
The average state of charge of the energy storage module 20 is an average of the states of charge of all the energy storage units 22 in the energy storage module 20, and the average state of charge of the energy storage system is an average of the states of charge of all the energy storage units 22 in the energy storage module 20 in operation. The maximum response power of the energy storage converter unit is related to the specification and configuration of the energy storage converter unit 21, and can be obtained from a configuration file, which represents the maximum sustainable power of the energy storage converter unit 21. The maximum response power of the energy storage units of the energy storage module 20 is the sum of the maximum bearable power of all the energy storage units 20 in each energy storage module 20. The maximum sustainable power of the energy storage unit 20 is the maximum power that the energy storage unit 20 can currently output or receive.
Specifically, after receiving the power required by the user, the main control device 10 may divide the power required by the user by the number of the energy storage modules 20 in operation to obtain a first average power. And then, fine-tuning the first average power according to the average state of charge of each operating energy storage module 20 and the average state of charge of the energy storage system to obtain the preliminary distributed power of each operating energy storage module 20, wherein the obtained preliminary distributed power better conforms to the current state of the energy storage module 20. The preliminary distributed power of each operating energy storage module 20 is then compared with the energy storage converter unit maximum response power and the energy storage unit maximum response power to determine a final first distributed power.
In this embodiment, the first average power is finely adjusted by using the average state of charge of each operating energy storage module 20 and the average state of charge of the energy storage system to obtain the preliminary distributed power, so that the preliminary distributed power better conforms to the current energy storage state of the energy storage module 20, and the final first distributed power is determined by comparing the preliminary distributed power with the maximum response power of the energy storage converter unit and the maximum response power of the energy storage unit, so that the maximum bearable powers of the energy storage converter unit 21 and the energy storage unit 20 in the energy storage module 20 are fully considered while the power balance of each energy storage module is satisfied, and the energy storage module 20 is prevented from being damaged due to the fact that the distributed power exceeds the maximum bearable power.
Optionally, the master control device 10 determines the preliminary allocated power of the nth operating energy storage module 20 based on the following formula:
the preliminary distributed power is the first average power and the average state of charge of the nth operating energy storage module/the average state of charge of the energy storage system, where n is greater than or equal to 1 and less than or equal to m, and m is the number of operating energy storage modules 20.
The first average power is the number of energy storage modules 20 required by the user. The distributed power of each energy storage module 20 is adjusted by the ratio of the average state of charge of the nth operating energy storage module 20 to the average state of charge of the energy storage system, so that the determined preliminary distributed power more conforms to the state of charge of the energy storage module 20.
Optionally, the first distributed power is less than or equal to the smaller of the maximum response power of the energy storage current transformation unit and the maximum response power of the energy storage unit. The configuration is such that the finally determined first distributed power simultaneously satisfies the power requirement of the energy storage converter unit 21 and the power requirement of the energy storage unit 22, and the energy storage module 20 is prevented from being damaged.
Specifically, the preliminary distribution power may be compared with the smaller of the maximum response power of the energy storage converter unit and the maximum response power of the energy storage unit, when the preliminary distribution power is smaller than the smaller, the first distribution power is equal to the preliminary distribution power, and when the preliminary distribution power is greater than or equal to the smaller, the first distribution power is equal to the smaller.
Optionally, the main control device 10 is configured to determine a second average power of each energy storage module 20 according to the remaining power and the number of energy storage modules 20 capable of performing power redistribution again, and determine the second distributed power according to the first distributed power, the corresponding second average power, the corresponding energy storage variable current unit maximum response power, and the corresponding energy storage unit maximum response power of each energy storage module 20 capable of performing power redistribution again.
Specifically, the energy storage module 20 capable of performing power distribution again is the energy storage module 20 which does not reach the maximum sustainable power after the first round of power distribution is finished, that is, the first distributed power is smaller than the smaller of the maximum response power of the energy storage converter unit and the maximum response power of the energy storage unit. The second average power is the remaining power/number of energy storage modules 20 to which power can be distributed again. The second distributed power may be determined according to the first distributed power corresponding to each energy storage module 20 capable of performing power distribution again, the second average power corresponding to each energy storage module, the maximum response power of the corresponding energy storage conversion unit, and the maximum response power of the corresponding energy storage unit, where the second distributed power is determined by respectively comparing the sum of the first distributed power and the second average distributed power with the maximum response power of the energy storage conversion unit and the maximum response power of the energy storage unit, and determining the final second distributed power according to the comparison result.
In this embodiment, during the second round of power distribution, the remaining power is directly divided into the energy storage modules 20 capable of performing power distribution again, and the distribution result is compared with the maximum response power of the energy storage variable current unit and the maximum response power of the energy storage unit, so as to finally determine the second distribution power, thereby increasing the power distribution speed.
Optionally, the main control device 10 obtains the required power input by the user every a first set time, and when the required power input by the user is not obtained within a second set time, obtains the stored required power, and determines the stored required power as the required power of the user, where the second set time is longer than the first set time.
Specifically, the first set time period and the second set time period may be set as needed. The stored required power may be a required power set by the system according to needs, or may be a required power input last time by the user, which is not specifically limited in this embodiment. In this embodiment, the required power input by the user is not obtained after the second set duration, and power distribution is performed according to the stored required power, so that the power of the energy storage system is always in a balanced state, and the influence on the service life of the energy storage modules 20 due to long-time imbalance of the power of each energy storage module 20 is avoided.
Fig. 2 is a process diagram of power allocation provided in an embodiment of the present invention, and referring to fig. 2, a control device receives a user required power input by a user in real time, performs power allocation according to the user required power after obtaining the user required power, determines whether a power balancing self-updating period is reached when the user required power is not obtained, obtains a required power input by a previous user if the power balancing self-updating period is reached, and performs power allocation according to the required power input by the previous user.
When power distribution is carried out, first round of power distribution is carried out: determining a first average power according to the power required by a user and the number of the operating energy storage modules, determining the initial distribution power of the first operating energy storage module, setting the first distribution power to be equal to the initial distribution power, comparing the first distribution power with the maximum response power of the energy storage converter unit and the maximum response power of the energy storage unit respectively to determine the final first distribution power, determining the first distribution power of the second operating energy storage module, and so on until the first distribution power of all the operating energy storage modules is determined.
And then judging whether the residual power exists or not, and directly sending a power scheduling instruction to the energy storage modules according to the first distributed power of each energy storage module when the residual power does not exist.
When there is remaining power, a second round of power allocation is started: firstly, determining a second average power, setting the distributed power of the first energy storage module capable of performing power distribution again as the sum of the first distributed power and the second average power, then comparing the distributed power with the maximum response power of the energy storage current transformation unit and the maximum response power of the energy storage unit respectively to determine the final distributed power, then determining the distributed power of the second operated energy storage module, and so on until the distributed power of all the operated energy storage modules is determined. And finally, sending a power scheduling instruction to the energy storage module according to the distributed power of the energy storage module.
Fig. 3 is a schematic diagram of another energy storage system provided in an embodiment of the present invention, and optionally, referring to fig. 3, the master control device 10 further includes a first monitoring unit 11 and a second monitoring unit 12;
the first monitoring unit 11 is configured to acquire operation data of each energy storage module 20, determine, according to the operation data, a level of an abnormal event when the energy storage module 20 has the abnormal event, and push the abnormal event to the second monitoring unit 12 when the level of the abnormal event is a system level;
the second listening unit 12 is used for processing exception events at the system level.
Specifically, the operation data may include the voltage of the energy storage battery in the energy storage unit 22, the current of the energy storage battery, the temperature parameter of the energy storage battery, the operation information of the energy storage converter unit, and the like. The abnormal event may include an abnormality of the energy storage battery or an abnormality of the energy storage converter unit, and the like, and the example abnormality of the energy storage battery may include an abnormality of the temperature of the energy storage battery, an abnormality of the current or an abnormality of the voltage, and the like. A system-level event is an abnormal event that needs to be solved by controlling the entire energy storage system, for example, if the temperature of the energy storage unit 22 is too high and a fire occurs, the entire energy storage system needs to be stopped for processing.
The master control device 10 may only be provided with one first monitoring unit 11, and the first monitoring unit 11 may determine whether there is an abnormal event in the energy storage modules 20 according to the operation data of each energy storage module 20. The main control device 10 may also be provided with a plurality of first monitoring units 11, each first monitoring unit 11 corresponds to one energy storage module 20, and the first monitoring unit 11 only obtains the operation data of the corresponding energy storage module 20, and determines whether an abnormal event exists in the energy storage module 20 according to the operation data.
In this embodiment, modular management is adopted, the energy storage module 20 is used as a minimum management unit, and a two-stage monitoring mode is adopted, so that the position and the level of an abnormal event can be quickly located, and the abnormal event can be timely and effectively processed.
Optionally, the first listening unit 11 is further configured to process the exception event when the exception event is a module-level event.
Specifically, a module-level event is an abnormal event that can be resolved only by performing corresponding control on a module where the event is located. Such as unstable voltage or current of the energy storage battery in the energy storage unit 22. The first monitoring unit 11 can process the abnormal event immediately after determining that the abnormal event is the module-level event, and the processing speed is higher.
Fig. 4 is a schematic diagram of another energy storage system provided in an embodiment of the present invention, and optionally, referring to fig. 4, the energy storage unit 22 includes an energy storage battery 221 and a refrigeration subunit 222, and the refrigeration subunit 222 includes an air-cooling subunit or a liquid-cooling subunit.
The refrigeration subunit 222 is configured to cool the energy storage battery 221, so that the energy storage battery 221 is in an environment with a constant temperature, the energy storage battery 221 is ensured to have more stable energy storage efficiency, and the energy storage efficiency is prevented from being affected by too low or too high temperature of the energy storage battery 221.
Optionally, the operation data includes a voltage of the energy storage battery 221, a current of the energy storage battery 221, a temperature of the energy storage battery 221, operation information of the energy storage converter unit 21, and operation information of the refrigeration subunit 222.
Specifically, when the refrigeration subunit 222 is an air-cooling subunit, the operation information of the refrigeration subunit 222 may include the refrigeration efficiency, the air speed, and the like of the air-cooling subunit, and when the refrigeration subunit 222 is a water-cooling subunit, the operation information of the refrigeration subunit 222 may include information of water pressure, water temperature, and the like.
Fig. 5 is a process diagram of processing an abnormal event according to an embodiment of the present invention, referring to fig. 5, in an operation process of an energy storage module, a first monitoring unit collects operation data of the energy storage module in real time, and monitors whether an abnormal event exists, when an abnormal event exists, determines whether the abnormal event is a system-level abnormal event, if yes, pushes the abnormal event to a second monitoring unit, after the second monitoring unit receives the abnormal event, the second monitoring unit can confirm the abnormal event again, when the system-level abnormal event does exist, the second monitoring unit processes and records the abnormal event, when the abnormal event does not exist, the event is cleared. When the abnormal event is not the system-level abnormal event, the first monitoring unit confirms whether the module-level abnormal event occurs again, if so, the first monitoring unit processes and records the abnormal event, and when the event does not exist, the event is cleared.
Fig. 6 is a flowchart of a method for controlling an energy storage system according to an embodiment of the present invention, where the energy storage system includes a main control device and at least two energy storage modules; each energy storage module comprises an energy storage current transformation unit and at least two energy storage units;
referring to fig. 6, the control method of the energy storage system includes:
s110, a main control device obtains user required power, first distribution power corresponding to each energy storage module is determined according to the user required power, the number of the operated energy storage modules and the charge state of energy storage units in the operated energy storage modules, when the first distribution power is determined and the required power is surplus, second distribution power of each energy storage module is determined according to the surplus power, and power scheduling instructions are sent to the corresponding energy storage converter units according to the first distribution power and the second distribution power corresponding to each energy storage module;
and S120, the energy storage current transformation unit charges the energy storage unit or discharges the energy storage unit according to the power scheduling instruction.
Optionally, S110 specifically includes:
the main control device determines the average charge state of each operating energy storage module and the average charge state of the energy storage system according to the charge states of the energy storage units in the operating energy storage modules, determines first average power according to the power required by users and the number of the operating energy storage modules, determines preliminary distribution power of each operating energy storage module according to the first average power, the average charge state of each operating energy storage module and the average charge state of the energy storage system, and determines first distribution power of each energy storage module according to the preliminary distribution power, the maximum response power of the energy storage converter unit of each operating energy storage module and the maximum response power of the energy storage unit of each operating energy storage module.
Optionally, the master control device determines the preliminary allocated power of the nth running energy storage module based on the following formula:
and the preliminary distributed power is the first average power and the average state of charge of the nth operated energy storage module/the average state of charge of the energy storage system, wherein n is greater than or equal to 1 and less than or equal to m, and m is the number of the operated energy storage modules.
Optionally, the first distributed power is less than or equal to the smaller of the maximum response power of the energy storage variable current unit and the maximum response power of the energy storage unit.
Optionally, S110 specifically includes:
and the main control device determines the second average power of each energy storage module according to the residual power and the number of the energy storage modules capable of performing power distribution again, and determines the second distributed power according to the first distributed power corresponding to each energy storage module capable of performing power distribution again, the corresponding second average power, the corresponding maximum response power of the energy storage current transformation unit and the corresponding maximum response power of the energy storage unit.
Optionally, the obtaining the power required by the user includes:
the method comprises the steps that a main control device obtains required power input by a user every a first set time length, when the required power input by the user is not obtained in a second set time length, the stored required power is obtained, and the stored required power is determined as the required power of the user, wherein the second set time length is longer than the first set time length.
Optionally, the master control device further includes a first monitoring unit and a second monitoring unit;
the method further comprises the following steps:
the method comprises the steps that a first monitoring unit obtains operation data of each energy storage module, judges the grade of an abnormal event when the energy storage module is determined to have the abnormal event according to the operation data, and pushes the abnormal event to a second monitoring unit when the grade of the abnormal event is a system grade;
and the second monitoring unit processes the abnormal event at the system level.
Optionally, the method further includes: and the first monitoring unit processes the abnormal event when the abnormal event is a module-level event.
Optionally, the energy storage unit includes an energy storage battery and a refrigeration subunit, and the refrigeration subunit includes an air-cooled subunit or a liquid-cooled subunit.
Optionally, the operation data includes voltage of the energy storage battery, current of the energy storage battery, temperature of the energy storage battery, operation information of the energy storage converter unit, and operation information of the refrigeration subunit.
The control method of the energy storage system provided by this embodiment and the energy storage system provided by any embodiment of the present invention belong to the same inventive concept, and have corresponding beneficial effects, and detailed calculation details in this embodiment are not described in the energy storage system provided by any embodiment of the present invention.
It should be understood that various forms of the flows shown above may be used, with steps reordered, added, or deleted. For example, the steps described in the present invention may be executed in parallel, sequentially, or in different orders, and are not limited herein as long as the desired results of the technical solution of the present invention can be achieved.
The above-described embodiments should not be construed as limiting the scope of the invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions may be made in accordance with design requirements and other factors. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (11)
1. An energy storage system, comprising:
the energy storage device comprises a main control device and at least two energy storage modules;
the main control device is electrically connected with the energy storage modules, each energy storage module comprises an energy storage converter unit and at least two energy storage units, and the energy storage converter unit in each energy storage module is electrically connected with the energy storage units;
the main control device is used for acquiring user required power, determining first distribution power corresponding to each energy storage module according to the user required power, the number of the operated energy storage modules and the charge state of energy storage units in the operated energy storage modules, determining second distribution power of each energy storage module according to the remaining power when the first distribution power is determined and the user required power is left, and sending a power scheduling instruction to the corresponding energy storage current conversion units according to the first distribution power and the second distribution power corresponding to each energy storage module;
the energy storage current transformation unit is used for charging the energy storage unit or discharging the energy storage unit according to the power scheduling instruction.
2. The energy storage system of claim 1, wherein:
the main control device is used for determining the average charge state of each operating energy storage module and the average charge state of the energy storage system according to the charge states of the energy storage units in the operating energy storage modules, determining first average power according to the power required by users and the number of the operating energy storage modules, determining preliminary distribution power of each operating energy storage module according to the first average power, the average charge state of each operating energy storage module and the average charge state of the energy storage system, and determining the first distribution power of each energy storage module according to the preliminary distribution power, the maximum response power of the energy storage converter unit of each operating energy storage module and the maximum response power of the energy storage unit of each operating energy storage module.
3. The energy storage system of claim 2, wherein:
the master control device determines the preliminary distribution power of the nth operated energy storage module based on the following formula:
and the preliminary distributed power is the first average power and the average state of charge of the nth operated energy storage module/the average state of charge of the energy storage system, wherein n is greater than or equal to 1 and less than or equal to m, and m is the number of the operated energy storage modules.
4. The energy storage system of claim 2, wherein:
the first distributed power is less than or equal to the smaller of the maximum response power of the energy storage current transformation unit and the maximum response power of the energy storage unit.
5. The energy storage system of claim 1, wherein:
the main control device is used for determining a second average power of each energy storage module according to the residual power and the number of the energy storage modules capable of performing power distribution again, and determining the second distributed power according to a first distributed power corresponding to each energy storage module capable of performing power distribution again, a corresponding second average power, a corresponding maximum response power of the energy storage current transformation unit and a corresponding maximum response power of the energy storage unit.
6. The energy storage system of claim 1, wherein:
the main control device is used for acquiring the required power input by the user every a first set time length, acquiring the stored required power when the required power input by the user is not acquired in a second set time length, and determining the stored required power as the required power of the user, wherein the second set time length is longer than the first set time length.
7. The energy storage system of claim 1, wherein:
the master control device also comprises a first monitoring unit and a second monitoring unit;
the first monitoring unit is used for acquiring operation data of each energy storage module, judging the grade of an abnormal event when the energy storage module is determined to have the abnormal event according to the operation data, and pushing the abnormal event to the second monitoring unit when the grade of the abnormal event is a system grade;
the second monitoring unit is used for processing the abnormal event at a system level.
8. The energy storage system of claim 7, wherein:
the first monitoring unit is further configured to process the exception event when the exception event is a module-level event.
9. The energy storage system of claim 7, wherein:
the energy storage unit comprises an energy storage battery and a refrigeration subunit, and the refrigeration subunit comprises an air-cooled subunit or a liquid-cooled subunit.
10. The energy storage system of claim 9, wherein:
the operation data comprises the voltage of the energy storage battery, the current of the energy storage battery, the temperature of the energy storage battery, the operation information of the energy storage current transformation unit and the operation information of the refrigeration subunit.
11. The control method of the energy storage system is characterized in that the energy storage system comprises a main control device and at least two energy storage modules; each energy storage module comprises an energy storage current transformation unit and at least two energy storage units;
the control method of the energy storage system comprises the following steps:
the method comprises the steps that a main control device obtains power required by a user, first distribution power corresponding to each energy storage module is determined according to the power required by the user, the number of operating energy storage modules and the charge state of energy storage units in the operating energy storage modules, when the first distribution power is determined and the power required by the user is surplus, second distribution power of each energy storage module is determined according to the surplus power, and power scheduling instructions are sent to the corresponding energy storage conversion units according to the first distribution power and the second distribution power corresponding to each energy storage module;
and the energy storage current converting unit charges the energy storage unit or discharges the energy storage unit according to the power scheduling instruction.
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| CN117200282A (en) * | 2023-11-07 | 2023-12-08 | 坎德拉(深圳)新能源科技有限公司 | Flywheel energy storage array control method, system, array and storage medium |
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| CN117200282A (en) * | 2023-11-07 | 2023-12-08 | 坎德拉(深圳)新能源科技有限公司 | Flywheel energy storage array control method, system, array and storage medium |
| CN117200282B (en) * | 2023-11-07 | 2024-03-19 | 坎德拉(深圳)新能源科技有限公司 | Flywheel energy storage array control method, system, array and storage medium |
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