CN113224813A - Off-grid photovoltaic energy storage system control method and device, computer and storage medium - Google Patents

Off-grid photovoltaic energy storage system control method and device, computer and storage medium Download PDF

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Publication number
CN113224813A
CN113224813A CN202110481621.6A CN202110481621A CN113224813A CN 113224813 A CN113224813 A CN 113224813A CN 202110481621 A CN202110481621 A CN 202110481621A CN 113224813 A CN113224813 A CN 113224813A
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energy storage
state value
frequency
storage system
storage battery
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CN202110481621.6A
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CN113224813B (en
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吴志猛
蔡朝圳
周党生
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Shenzhen Hopewind Electric Co Ltd
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Shenzhen Hopewind Electric Co Ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/00302—Overcharge protection
    • 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
    • H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
    • H02J3/241—The oscillation concerning frequency
    • 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
    • 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
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/388—Islanding, i.e. disconnection of local power supply from the network
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy
    • Y02E10/56—Power conversion systems, e.g. maximum power point trackers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E70/00—Other energy conversion or management systems reducing GHG emissions
    • Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin

Abstract

The embodiment of the invention discloses a method and a device for controlling an off-grid photovoltaic energy storage system, a computer and a storage medium. The method comprises the following steps: firstly, determining whether the current capacity state value of the energy storage battery is greater than or equal to a preset frequency hopping point state value by an off-grid photovoltaic energy storage system; if the frequency hopping point state value is larger than or equal to the frequency hopping point state value, adjusting the frequency of the off-grid photovoltaic energy storage system to a preset frequency hopping frequency, so that the photovoltaic inverter is stopped due to over-frequency protection; then determining whether the current capacity state value of the energy storage battery is smaller than a preset return point state value; and if the frequency of the off-grid photovoltaic energy storage system is less than the working frequency, adjusting the frequency of the off-grid photovoltaic energy storage system to the working frequency, and enabling the photovoltaic inverter to recover to work. According to the scheme, the photovoltaic inverter does not need an additional communication interface to communicate with a system, and the overcharging of the energy storage battery can be avoided, so that the problem that the communication interface is not reserved or the engineering quantity is increased due to the fact that a communication cable is added when the photovoltaic inverter is connected into an off-grid photovoltaic energy storage system is solved.

Description

Off-grid photovoltaic energy storage system control method and device, computer and storage medium
Technical Field
The invention relates to the technical field of photovoltaic energy storage, in particular to a control method and device of an off-grid photovoltaic energy storage system, a computer and a storage medium.
Background
In an off-grid photovoltaic Energy storage System, a photovoltaic inverter, an Energy storage inverter, and a Battery Management System (BMS) are respectively connected to an Energy Management System (ESM) in a communication manner.
In the prior art, a charging and discharging strategy of an energy storage system is mainly implemented by connecting a photovoltaic inverter into an EMS through communication, and when the EMS detects that a State of Charge (SOC) of an energy storage battery is greater than a certain value through the BMS, the EMS sends a generated power limiting message to the photovoltaic inverter, so that the generated power of the photovoltaic inverter is limited, and the energy storage battery is prevented from being overcharged.
Above-mentioned scheme has already been built to partial project photovoltaic system, and the project of later stage increase and join in marriage energy storage system then has great influence, from the angle of hardware, then whether need consider photovoltaic inverter exist communication interface and EMS energy management system that reserves in earlier stage and communicate, even have the communication interface of reserving, still need newly-increased the communication cable of laying this moment, increase the engineering volume of project.
Disclosure of Invention
The embodiment of the invention provides a control method and device of an off-grid photovoltaic energy storage system, a computer and a storage medium, and aims to solve the problem that when a photovoltaic inverter is connected into the off-grid photovoltaic energy storage system, no communication interface is reserved or the amount of engineering is increased due to the addition of communication cables.
In a first aspect, an embodiment of the present invention provides a method for controlling an off-grid photovoltaic energy storage system, where the method is applied to an off-grid photovoltaic energy storage system, a photovoltaic inverter in the off-grid photovoltaic energy storage system is connected to the off-grid photovoltaic energy storage system through a bus, and the photovoltaic inverter can charge an energy storage battery in the off-grid photovoltaic energy storage system through the bus, and the method includes:
when the off-grid photovoltaic energy storage system is at the working frequency, determining whether the current capacity state value of the energy storage battery is greater than or equal to a preset frequency hopping point state value;
if the current capacity state value of the energy storage battery is larger than or equal to the frequency hopping point state value, adjusting the frequency of the off-grid photovoltaic energy storage system to a preset frequency hopping frequency, so that the photovoltaic inverter is stopped due to over-frequency protection;
when the off-grid photovoltaic energy storage system is in the frequency hopping frequency, determining whether the current capacity state value of the energy storage battery is smaller than a preset return point state value, wherein the return point state value is smaller than the frequency hopping point state value;
and if the current capacity state value of the energy storage battery is smaller than the return point state value, adjusting the frequency of the off-grid photovoltaic energy storage system to the working frequency, so that the photovoltaic inverter recovers to work.
In some embodiments, the determining whether the current capacity state value of the energy storage battery is greater than or equal to a preset frequency hopping point state value includes:
acquiring a current capacity state value of the energy storage battery through a BMS in the off-grid photovoltaic energy storage system;
and comparing the current capacity state value of the energy storage battery with a preset frequency hopping point state value to determine whether the current capacity state value of the energy storage battery is greater than or equal to the frequency hopping point state value.
In some embodiments, the determining whether the current capacity state value of the energy storage battery is smaller than a preset return point state value includes:
acquiring a current capacity state value of the energy storage battery through the BMS;
and comparing the current capacity state value of the energy storage battery with a preset return point state value to determine whether the current capacity state value of the energy storage battery is smaller than the return point state value.
In some embodiments, if the frequency is greater than or equal to the frequency hopping point state value, adjusting the frequency of the off-grid photovoltaic energy storage system to a preset frequency hopping frequency includes:
when the current capacity state value is determined to be larger than or equal to the frequency hopping point state value, the EMS in the off-grid photovoltaic energy storage system adjusts the frequency of the off-grid photovoltaic energy storage system to the frequency hopping frequency.
In some embodiments, if the value is less than the return point state value, adjusting the frequency of the off-grid photovoltaic energy storage system to the operating frequency includes:
when the current capacity state value is smaller than the return point state value, the EMS in the off-grid photovoltaic energy storage system adjusts the frequency of the off-grid photovoltaic energy storage system to the working frequency.
In some embodiments, if the current capacity state value of the energy storage battery is greater than or equal to the frequency hopping point state value, adjusting the frequency of the off-grid photovoltaic energy storage system to a preset frequency hopping frequency, so that the photovoltaic inverter is shut down due to over-frequency protection, including:
if the current voltage value of the energy storage battery is larger than or equal to the voltage value of the frequency hopping point, or the current SOC of the energy storage battery is larger than or equal to the SOC of the frequency hopping point, adjusting the frequency of the off-grid photovoltaic energy storage system to a preset frequency hopping frequency, so that the photovoltaic inverter is shut down due to over-frequency protection.
In some embodiments, if the current capacity state value of the energy storage battery is smaller than the return point state value, adjusting the frequency of the off-grid photovoltaic energy storage system to the operating frequency so that the photovoltaic inverter resumes operating includes:
if the current voltage value of the energy storage battery is smaller than the voltage value of the return point and the current SOC of the energy storage battery is smaller than the SOC of the return point, adjusting the frequency of the off-grid photovoltaic energy storage system to the working frequency, and enabling the photovoltaic inverter to recover to work.
In a second aspect, the embodiment of the present invention further provides an off-grid photovoltaic energy storage device, which includes a unit for performing the above method.
In a third aspect, an embodiment of the present invention further provides a computer device, which includes a memory and a processor, where the memory stores a computer program, and the processor implements the above method when executing the computer program.
In a fourth aspect, the present invention also provides a computer-readable storage medium, which stores a computer program, the computer program including program instructions, which when executed by a processor, implement the above method.
The embodiment of the invention provides a method and a device for controlling an off-grid photovoltaic energy storage system, a computer and a storage medium. In this embodiment, first, when the off-grid photovoltaic energy storage system is at the operating frequency, the off-grid photovoltaic energy storage system determines whether the current capacity state value of the energy storage battery is greater than or equal to a preset frequency hopping point state value; if the frequency hopping point state value is larger than or equal to the frequency hopping point state value, adjusting the frequency of the off-grid photovoltaic energy storage system to a preset frequency hopping frequency, so that the photovoltaic inverter is stopped due to over-frequency protection; then when the off-grid photovoltaic energy storage system is in the frequency hopping frequency, determining whether the current capacity state value of the energy storage battery is smaller than a preset return point state value; and if the value is less than the return point state value, adjusting the frequency of the off-grid photovoltaic energy storage system to the working frequency, so that the photovoltaic inverter recovers to work. In the embodiment of the invention, the photovoltaic inverter can be connected into the system through the bus, when the capacity state value of the energy storage battery is too high, the frequency of the off-grid photovoltaic energy storage system is increased, so that the photovoltaic inverter is stopped due to over-frequency protection, when the capacity state value of the energy storage battery is recovered to the value of the chargeable state, the frequency of the off-grid photovoltaic energy storage system is adjusted to the working frequency, so that the photovoltaic inverter recovers to work.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are 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 communication connection diagram of a control method for an off-grid photovoltaic energy storage system according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a system framework of an off-grid photovoltaic energy storage system control method according to an embodiment of the present invention;
fig. 3 is a schematic flow chart of a control method of an off-grid photovoltaic energy storage system according to an embodiment of the present invention;
fig. 4 is a schematic sub-flow diagram of a control method for an off-grid photovoltaic energy storage system according to an embodiment of the present invention;
fig. 5 is another schematic sub-flow diagram of a control method for an off-grid photovoltaic energy storage system according to an embodiment of the present invention;
fig. 6 is another schematic sub-flow diagram of a control method for an off-grid photovoltaic energy storage system according to an embodiment of the present invention;
fig. 7 is another schematic sub-flow diagram of a control method for an off-grid photovoltaic energy storage system according to an embodiment of the present invention;
fig. 8 is a schematic block diagram of an off-grid photovoltaic energy storage device provided by an embodiment of the present invention;
FIG. 9 is a schematic block diagram of a computer device provided by an embodiment of the present invention.
Detailed Description
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 some, not all, embodiments of the present invention. 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 will be understood that the terms "comprises" and/or "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
It is also to be understood that the terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the specification of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be further understood that the term "and/or" as used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.
Referring to fig. 1, fig. 1 is a communication connection diagram of an off-grid photovoltaic energy storage system according to the present invention, in which an EMS is in communication connection with an energy storage converter and a BMS, respectively.
Referring to fig. 2, fig. 2 is a schematic diagram of a system framework of an off-grid photovoltaic energy storage system according to the present invention, in which a photovoltaic inverter is connected to a photovoltaic module, the photovoltaic inverter is connected to an original off-grid photovoltaic energy storage system through a bus, an energy storage battery is connected to the bus through an energy storage converter and an isolation transformer, and the photovoltaic inverter in the present invention can charge the energy storage battery through the bus.
In some embodiments, please refer to fig. 2, the off-grid photovoltaic energy storage system further includes a switch Q1 and a switch Q2, wherein Q1 is disposed between the photovoltaic inverter and the bus, and Q2 is disposed between the isolation transformer and the bus for connecting the photovoltaic system (photovoltaic inverter + photovoltaic module) and the battery system (isolation transformer + energy storage converter + energy storage battery) to the bus, respectively, so as to facilitate power-off maintenance of the photovoltaic system and the battery system.
The following explains the terms to which the present invention mainly relates:
an energy storage converter: the energy storage converter is applied to an energy storage energy conversion link, is basically characterized by alternating current-direct current bidirectional conversion, and has the functions of peak clipping, valley filling, emergency power supply, no supply compensation, electric energy quality control and the like.
Photovoltaic inverter: the inverter is mainly used for converting direct current power into alternating current power and generally comprises a boosting circuit and an inverter bridge circuit, and the photovoltaic inverter in the embodiment has an over-frequency protection function.
A photovoltaic module: the solar cell panel is a core part in a solar power generation system and also is the most important part in the solar power generation system, and has the function of converting solar energy into electric energy and transmitting the electric energy to an energy storage battery for storage or pushing a load to work.
Bus bar: refers to a common path on which multiple devices are connected in parallel branches.
An energy storage battery: the storage battery is mainly used for storing electric energy.
Isolating the transformer: the bus is isolated from the energy storage system, so that electric shock accidents are prevented, and a certain filtering effect is achieved.
EMS: namely an EMS energy management system is a general name of a core system (including hard and software) for controlling the charging and discharging strategy of an energy storage system.
BMS: the BMS battery management system is mainly used for intelligently managing and maintaining each battery unit, prolonging the service life of the battery and monitoring the state of the battery.
Referring to fig. 3, fig. 3 is a schematic flow chart of an off-grid photovoltaic energy storage method according to an embodiment of the present invention. An execution main body of the off-grid photovoltaic energy storage method may be the off-grid photovoltaic energy storage system provided by the embodiment of the present invention, and specifically, the execution main body may be the EMS in the off-grid photovoltaic energy storage system provided by the embodiment of the present invention. As shown in fig. 3, the method includes the following steps S110 to S150:
s110, when the off-grid photovoltaic energy storage system is at the working frequency, determining whether the current capacity state value of the energy storage battery is larger than or equal to a preset frequency hopping point state value, if so, executing the step S120, otherwise, not changing the frequency, and continuing to execute the step S110.
It should be noted that, when the off-grid photovoltaic energy storage system is at an operating frequency, the photovoltaic inverter charges the energy storage battery in the energy storage system through the bus, where the operating frequency in this embodiment is a frequency at which the photovoltaic inverter and other devices of the off-grid photovoltaic energy storage system can normally operate.
The state-of-capacity value in this embodiment may reflect the state-of-capacity of the battery, and in some embodiments, the state-of-capacity value includes a voltage value or an SOC.
Similarly, the preset hopping point state value reflects that the battery is in an overcharged state, that is, if the current capacity state value of the energy storage battery is equal to the hopping point state value, it indicates that the energy storage battery is in the overcharged state at this time, and the photovoltaic inverter needs to stop charging the energy storage battery.
In this embodiment, a user needs to set a state value of a frequency hopping point in the EMS in advance, that is, a voltage value of the frequency hopping point and an SOC of the frequency hopping point are set.
Specifically, in some embodiments, as shown in FIG. 4, the step S110 may include steps S111-S113:
and S111, acquiring the current capacity state value of the energy storage battery through a BMS in the off-grid photovoltaic energy storage system.
And S112, determining whether the current capacity state value of the energy storage battery is larger than or equal to the state value of the frequency hopping point.
In step 110, since the BMS may acquire the state information of the energy storage battery, the present embodiment may continuously acquire the current capacity state value of the energy storage battery in real time through the BMS, as shown in fig. 1, since the BMS in the off-grid photovoltaic energy storage system in the present embodiment is in communication connection with the EMS, the BMS in the present embodiment may send the current capacity state value to the EMS, specifically, in order to prevent the energy storage state of the energy storage battery from being determined in time and avoid the energy storage battery from being in an overcharged state, in the present embodiment, the BMS needs to acquire and send the capacity state value of the energy storage battery to the EMS in real time.
After the EMS acquires the current capacity state value of the energy storage battery, whether the capacity state value is larger than or equal to a preset frequency hopping point state value or not is judged, specifically, whether the acquired voltage value is larger than or equal to a preset frequency hopping point voltage value or whether the acquired SOC is larger than or equal to a preset frequency hopping point SOC is judged by the EMS;
and S120, adjusting the frequency of the off-grid photovoltaic energy storage system to a preset frequency hopping frequency, so that the photovoltaic inverter is stopped due to over-frequency protection.
Specifically, in this embodiment, if the current voltage value of the energy storage battery is greater than or equal to the voltage value of the frequency hopping point, or if the current SOC of the energy storage battery is greater than or equal to the SOC of the frequency hopping point, the frequency of the off-grid photovoltaic energy storage system is adjusted to a preset frequency hopping frequency, so that the photovoltaic inverter is shut down due to over-frequency protection.
It should be noted that, in some embodiments, even though the invention needs to determine two values, namely, the voltage value of the frequency hopping point and the SOC of the frequency hopping point, the frequency of the off-grid photovoltaic energy storage system needs to be adjusted to the preset frequency hopping frequency only if one value satisfies the condition that "is greater than or equal to the preset state value of the frequency hopping point", so that the photovoltaic inverter can be shut down due to over-frequency protection.
Specifically, in some embodiments, step S120 may include, when it is determined that the current capacity status value is greater than or equal to the hop point status value, the EMS in the off-grid photovoltaic energy storage system adjusting the frequency of the off-grid photovoltaic energy storage system to the hop frequency. The specific implementation method for adjusting the frequency of the off-grid photovoltaic energy storage system to the frequency hopping frequency can be as shown in fig. 5, and includes steps S121 to S122:
and S121, sending a first frequency adjustment instruction to an energy storage converter in the off-grid photovoltaic energy storage system.
And S122, adjusting the frequency of the off-grid photovoltaic energy storage system to a frequency hopping frequency through the energy storage converter according to the first frequency adjustment instruction.
In this embodiment, as shown in fig. 1, since the EMS and the energy storage converter originally have communication connection, when the EMS determines that the current capacity state value is greater than or equal to the state value of the frequency hopping point, the embodiment may send a first frequency adjustment instruction to the energy storage converter through the EMS, so that the energy storage converter adjusts the frequency of the whole off-grid photovoltaic energy storage system according to the first frequency adjustment instruction, at this time, the photovoltaic inverter may stop due to its own over-frequency protection, thereby stopping continuing to charge the energy storage battery, and preventing the occurrence of the situation of the over-charging of the energy storage battery due to the photovoltaic charging.
S130, when the off-grid photovoltaic energy storage system is in the frequency hopping frequency, determining whether the current capacity state value of the energy storage battery is smaller than a preset return point state value, if so, executing the step S140, and if not, continuing to execute the step S130.
In this embodiment, when the off-grid photovoltaic energy storage system is at the frequency hopping frequency, it indicates that the photovoltaic inverter has stopped, and the charging of the energy storage battery is interrupted, and at this time, the state of the energy storage battery needs to be determined, and it is determined whether the photovoltaic inverter continues to operate, so that the energy storage battery continues to be charged.
It should be noted that, when the photovoltaic inverter is in the shutdown state, the energy storage battery may charge other loads, the remaining amount of the energy storage battery will decrease, and at this time, the state of capacity value of the energy storage battery will change, for example, the voltage value and the SOC will decrease.
It should be noted that, in some embodiments, when the EMS sets the voltage value at the return point and the SOC value at the return point at the same time, the EMS needs to determine the two values at the same time.
The state value of the return point in this embodiment may reflect a current state of the energy storage battery, and the energy storage battery may continue to be charged, and a user needs to set the state value of the return point in the EMS in advance.
In some embodiments, the return point state values include a return point voltage value and a return point SOC.
It should be noted that, when the state value of the return point and the state value of the frequency hopping point are preset, the state value of the return point needs to be set to be smaller than the state value of the frequency hopping point, for example, the voltage value of the return point is 3.5v, the voltage value of the frequency hopping point is 3.6v, the SOC of the return point is 85%, and the SOC of the frequency hopping point is 90%, where these values are merely for illustration, and specific values are not limited here.
Specifically, in some embodiments, as shown in fig. 6, the step S130 may include steps S131-S133:
and S131, acquiring the current capacity state value of the energy storage battery through the BMS.
And S132, determining whether the current capacity state value of the energy storage battery is smaller than the return point state value.
In step 110, since the BMS may acquire the state information of the energy storage battery, the present embodiment may continuously acquire the current capacity state value of the energy storage battery in real time through the BMS, as shown in fig. 1, since the BMS in the off-grid photovoltaic energy storage system in the present embodiment is in communication connection with the EMS, the BMS in the present embodiment may send the current capacity state value to the EMS.
Specifically, in this embodiment, determining whether the current capacity state value of the energy storage battery is smaller than the preset return point state value specifically includes: the BMS acquires the current capacity state value of the energy storage battery, sends the current capacity state value to the EMS in the off-grid photovoltaic energy storage system through the BMS, and determines whether the current capacity state value of the energy storage battery is smaller than a preset return point state value through the EMS.
And S140, adjusting the frequency of the off-grid photovoltaic energy storage system to the working frequency, so that the photovoltaic inverter recovers to work, and returning to execute the step S110.
Specifically, in this embodiment, if the current voltage value of the energy storage battery is smaller than the voltage value of the return point and the current SOC of the energy storage battery is smaller than the SOC of the return point, the frequency of the off-grid photovoltaic energy storage system is adjusted to a preset operating frequency, so that the photovoltaic inverter resumes operating.
In some embodiments, the frequency of the off-grid photovoltaic energy storage system can be adjusted to the working frequency only when two conditions that the current voltage value of the energy storage battery is smaller than the voltage value of the return point and the current SOC of the energy storage battery is smaller than the SOC of the frequency hopping point are met, so that the judgment precision of the system on the battery is improved.
In some embodiments, this step S140 may include, when it is determined that the current capacity status value is less than the return point status value, the EMS in the off-grid photovoltaic energy storage system adjusting the frequency of the off-grid photovoltaic energy storage system to the operating frequency. The specific steps of adjusting the frequency of the off-grid photovoltaic energy storage system to the operating frequency may be as shown in fig. 7, and include steps S141 to S142:
and S141, when the current capacity state value is smaller than the return point state value, sending a second frequency adjustment instruction to the energy storage converter.
And S142, adjusting the frequency of the off-grid photovoltaic energy storage system to the working frequency through the energy storage converter according to the second frequency adjustment instruction.
In this embodiment, the second frequency adjustment instruction is used to instruct the energy storage converter to adjust the frequency of the off-grid photovoltaic energy storage system to the working frequency, and when the photovoltaic inverter detects that the system is at the working frequency, the system will resume working and continue to charge the energy storage battery, so as to control the capacity state of the energy storage battery without introducing photovoltaic into the EMS, thereby preventing the battery from being overcharged during photovoltaic power generation.
In summary, the adjustment of the system frequency includes: when the energy storage battery is in a full-charge state, if the photovoltaic continues to charge the energy storage system, the battery overcharging condition will occur, so that the system frequency is adjusted to be the hopping frequency, the photovoltaic inverter is stopped due to the over-frequency protection, and the energy storage battery is stopped to be charged, so that the occurrence of the overcharge condition is prevented. When the photovoltaic inverter is stopped, the energy storage system supplies power to the load, the voltage and the SOC of the battery on the direct current side gradually decrease, when the energy storage system is judged to be in an unfilled state, the system frequency is adjusted to be working frequency, redundant electric energy of photovoltaic power generation can continue to charge the stored energy, and the logic is circulated again.
In this embodiment, first, when the off-grid photovoltaic energy storage system is at the operating frequency, the off-grid photovoltaic energy storage system determines whether the current capacity state value of the energy storage battery is greater than or equal to a preset frequency hopping point state value; if the frequency hopping point state value is larger than or equal to the frequency hopping point state value, adjusting the frequency of the off-grid photovoltaic energy storage system to a preset frequency hopping frequency, so that the photovoltaic inverter is stopped due to over-frequency protection; then when the off-grid photovoltaic energy storage system is in the frequency hopping frequency, determining whether the current capacity state value of the energy storage battery is smaller than a preset return point state value; if the value is smaller than the return point state value, adjusting the frequency of the off-grid photovoltaic energy storage system to the working frequency, and enabling the photovoltaic inverter to recover to work. In the embodiment of the invention, the photovoltaic inverter can be connected into the system through the bus, when the capacity state value of the energy storage battery is too high, the frequency of the off-grid photovoltaic energy storage system is increased, so that the photovoltaic inverter stops due to over-frequency protection, when the capacity state value of the energy storage battery is recovered to the value of the chargeable state, the frequency of the off-grid photovoltaic energy storage system is adjusted to the working frequency, so that the photovoltaic inverter recovers to work.
Compared with the prior art, the invention provides a new control idea on the basis of realizing the functional requirements of the system, is suitable for photovoltaic and energy storage synchronous planning projects, reduces the complexity of software, increases the running reliability of the system, is also suitable for newly increasing energy storage of constructed photovoltaic projects, basically does not need to change software and hardware, and reduces project engineering quantity.
Fig. 8 is a schematic block diagram of an off-grid photovoltaic energy storage device according to an embodiment of the present invention. As shown in fig. 8, corresponding to the above off-grid photovoltaic energy storage system control method, the present invention further provides an off-grid photovoltaic energy storage device, which includes a unit for executing the above off-grid photovoltaic energy storage system control method, specifically, the off-grid photovoltaic energy storage device is configured in an EMS of the off-grid photovoltaic energy storage system, for example, in a computer device implementing system control in the EMS. Specifically, referring to fig. 8, the off-grid photovoltaic energy storage device includes a first determining unit 801, a first adjusting unit 802, a second determining unit 803, and a second adjusting unit 804, where:
a first determining unit 801, configured to determine whether a current capacity state value of the energy storage battery is greater than or equal to a preset frequency hopping point state value when the off-grid photovoltaic energy storage system is at a working frequency;
a first adjusting unit 802, configured to adjust the frequency of the off-grid photovoltaic energy storage system to a preset frequency hopping frequency when the current capacity state value of the energy storage battery is greater than or equal to the frequency hopping point state value, so that the photovoltaic inverter is shut down due to over-frequency protection;
a second determining unit 803, configured to determine, when the off-grid photovoltaic energy storage system is in the frequency hopping frequency, whether a current capacity state value of the energy storage battery is smaller than a preset return point state value, where the return point state value is smaller than the frequency hopping point state value;
a second adjusting unit 804, configured to adjust the frequency of the off-grid photovoltaic energy storage system to a working frequency when the current capacity state value of the energy storage battery is smaller than the return point state value, so that the photovoltaic inverter resumes working.
In some embodiments, the first determining unit 801 is specifically configured to:
acquiring a current capacity state value of the energy storage battery through a BMS in the off-grid photovoltaic energy storage system;
and comparing the current capacity state value of the energy storage battery with a preset frequency hopping point state value to determine whether the current capacity state value of the energy storage battery is greater than or equal to the frequency hopping point state value.
In some embodiments, the second determining unit 803 is specifically configured to:
acquiring a current capacity state value of the energy storage battery through the BMS;
and comparing the current capacity state value of the energy storage battery with a preset return point state value to determine whether the current capacity state value of the energy storage battery is smaller than the return point state value.
In some embodiments, the first adjusting unit 802 is specifically configured to:
when the current capacity state value is determined to be larger than or equal to the frequency hopping point state value, the EMS in the off-grid photovoltaic energy storage system adjusts the frequency of the off-grid photovoltaic energy storage system to the frequency hopping frequency.
In some embodiments, the second adjusting unit 804 is specifically configured to:
when the current capacity state value is smaller than the return point state value, the EMS in the off-grid photovoltaic energy storage system adjusts the frequency of the off-grid photovoltaic energy storage system to the working frequency.
In some embodiments, the first adjusting unit 802 is further specifically configured to:
if the current voltage value of the energy storage battery is larger than or equal to the voltage value of the frequency hopping point, or the current SOC of the energy storage battery is larger than or equal to the SOC of the frequency hopping point, adjusting the frequency of the off-grid photovoltaic energy storage system to a preset frequency hopping frequency, so that the photovoltaic inverter is shut down due to over-frequency protection.
In some embodiments, the second adjusting unit 804 is further specifically configured to:
if the current voltage value of the energy storage battery is smaller than the voltage value of the return point and the current SOC of the energy storage battery is smaller than the SOC of the return point, adjusting the frequency of the off-grid photovoltaic energy storage system to a preset working frequency, and enabling the photovoltaic inverter to recover to work.
It should be noted that, as can be clearly understood by those skilled in the art, the specific implementation processes of the off-grid photovoltaic energy storage device and each unit may refer to the corresponding descriptions in the foregoing method embodiments, and for convenience and brevity of description, no further description is provided herein.
The off-grid photovoltaic energy storage apparatus may be implemented in the form of a computer program, which may be run on a computer device as shown in fig. 9.
Referring to fig. 9, fig. 9 is a schematic block diagram of a computer device according to an embodiment of the present invention. The computer device 900 may be a hardware device in an EMS in an off-grid photovoltaic energy storage system.
Referring to fig. 9, the computer device 900 includes a processor 902, memory, and a network interface 905 connected by a system bus 901, where the memory may include a non-volatile storage medium 903 and an internal memory 904.
The non-volatile storage medium 903 may store an operating system 9031 and a computer program 9032. The computer program 9032 includes program instructions that, when executed, cause the processor 902 to perform an off-grid photovoltaic energy storage system control method.
The processor 902 is used to provide computing and control capabilities to support the operation of the overall computer device 900.
The internal memory 904 provides an environment for the operation of a computer program 9032 in the non-volatile storage medium 903, and when executed by the processor 902, the computer program 9032 may cause the processor 902 to perform an off-grid photovoltaic energy storage system control method.
The network interface 905 is used for network communication with other devices. Those skilled in the art will appreciate that the configuration shown in fig. 9 is a block diagram of only a portion of the configuration associated with aspects of the present invention and is not intended to limit the computing device 900 to which aspects of the present invention may be applied, and that a particular computing device 900 may include more or less components than those shown, or may combine certain components, or have a different arrangement of components.
Wherein the processor 902 is configured to run a computer program 9032 stored in the memory to implement the following steps:
when the off-grid photovoltaic energy storage system is at the working frequency, determining whether the current capacity state value of the energy storage battery is greater than or equal to a preset frequency hopping point state value;
if the current capacity state value of the energy storage battery is larger than or equal to the frequency hopping point state value, adjusting the frequency of the off-grid photovoltaic energy storage system to a preset frequency hopping frequency, so that the photovoltaic inverter is stopped due to over-frequency protection;
when the off-grid photovoltaic energy storage system is in the frequency hopping frequency, determining whether the current capacity state value of the energy storage battery is smaller than a preset return point state value, wherein the return point state value is smaller than the frequency hopping point state value;
and if the current capacity state value of the energy storage battery is smaller than the return point state value, adjusting the frequency of the off-grid photovoltaic energy storage system to the working frequency, so that the photovoltaic inverter recovers to work.
In some embodiments, when the step of determining whether the current capacity state value of the energy storage battery is greater than or equal to the preset frequency hopping point state value is implemented, the processor 902 specifically implements the following steps:
acquiring a current capacity state value of the energy storage battery through a BMS in the off-grid photovoltaic energy storage system;
and comparing the current capacity state value of the energy storage battery with a preset frequency hopping point state value to determine whether the current capacity state value of the energy storage battery is greater than or equal to the frequency hopping point state value.
In some embodiments, when determining whether the current capacity state value of the energy storage battery is smaller than the preset return point state value, the processor 902 specifically implements the following steps:
acquiring a current capacity state value of the energy storage battery through the BMS;
and comparing the current capacity state value of the energy storage battery with a preset return point state value to determine whether the current capacity state value of the energy storage battery is smaller than the return point state value.
In some embodiments, when the processor 902 implements the step of adjusting the frequency of the off-grid photovoltaic energy storage system to a preset frequency hopping frequency if the frequency is greater than or equal to the frequency hopping point state value, the following steps are specifically implemented:
when the current capacity state value is determined to be larger than or equal to the frequency hopping point state value, the EMS in the off-grid photovoltaic energy storage system adjusts the frequency of the off-grid photovoltaic energy storage system to the frequency hopping frequency.
In some embodiments, when the processor 902 implements the step of adjusting the frequency of the off-grid photovoltaic energy storage system to the operating frequency if the value is smaller than the return point state value, the following steps are specifically implemented:
when the current capacity state value is smaller than the return point state value, the EMS in the off-grid photovoltaic energy storage system adjusts the frequency of the off-grid photovoltaic energy storage system to the working frequency.
In some embodiments, when the processor 902 implements the step of adjusting the frequency of the off-grid photovoltaic energy storage system to a preset frequency hopping frequency if the current capacity state value of the energy storage battery is greater than or equal to the frequency hopping point state value, so that the photovoltaic inverter is shut down due to over-frequency protection, the following steps are specifically implemented:
if the current voltage value of the energy storage battery is larger than or equal to the voltage value of the frequency hopping point, or the current SOC of the energy storage battery is larger than or equal to the SOC of the frequency hopping point, adjusting the frequency of the off-grid photovoltaic energy storage system to a preset frequency hopping frequency, so that the photovoltaic inverter is shut down due to over-frequency protection.
In some embodiments, when implementing that if the current capacity state value of the energy storage battery is smaller than the return point state value, the processor 902 adjusts the frequency of the off-grid photovoltaic energy storage system to the working frequency, so that the photovoltaic inverter recovers the working step, the following steps are specifically implemented:
if the current voltage value of the energy storage battery is smaller than the voltage value of the return point and the current SOC of the energy storage battery is smaller than the SOC of the return point, adjusting the frequency of the off-grid photovoltaic energy storage system to a preset working frequency, and enabling the photovoltaic inverter to recover to work.
It should be appreciated that in embodiments of the present invention, the Processor 802 may be a Central Processing Unit (CPU), and the Processor 802 may also be other general purpose processors, Digital Signal Processors (DSPs), Application Specific Integrated Circuits (ASICs), Field Programmable Gate Arrays (FPGAs) or other Programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. Wherein a general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
It will be understood by those skilled in the art that all or part of the flow of the method implementing the above embodiments may be implemented by a computer program instructing associated hardware. The computer program includes program instructions, and the computer program may be stored in a storage medium, which is a computer-readable storage medium. The program instructions are executed by at least one processor in the computer system to implement the flow steps of the embodiments of the method described above.
Accordingly, the present invention also provides a storage medium. The storage medium may be a computer-readable storage medium. The storage medium stores a computer program, wherein the computer program comprises program instructions. The program instructions, when executed by the processor, cause the processor to perform the steps of:
when the off-grid photovoltaic energy storage system is at the working frequency, determining whether the current capacity state value of the energy storage battery is greater than or equal to a preset frequency hopping point state value;
if the current capacity state value of the energy storage battery is larger than or equal to the frequency hopping point state value, adjusting the frequency of the off-grid photovoltaic energy storage system to a preset frequency hopping frequency, so that the photovoltaic inverter is stopped due to over-frequency protection;
when the off-grid photovoltaic energy storage system is in the frequency hopping frequency, determining whether the current capacity state value of the energy storage battery is smaller than a preset return point state value, wherein the return point state value is smaller than the frequency hopping point state value;
and if the current capacity state value of the energy storage battery is smaller than the return point state value, adjusting the frequency of the off-grid photovoltaic energy storage system to the working frequency, so that the photovoltaic inverter recovers to work.
In some embodiments, when the processor executes the program instructions to implement the step of determining whether the current capacity state value of the energy storage battery is greater than or equal to a preset frequency hopping point state value, the following steps are specifically implemented:
acquiring a current capacity state value of the energy storage battery through a BMS in the off-grid photovoltaic energy storage system;
and comparing the current capacity state value of the energy storage battery with a preset frequency hopping point state value to determine whether the current capacity state value of the energy storage battery is greater than or equal to the frequency hopping point state value.
In some embodiments, when the processor executes the program instructions to determine whether the current capacity state value of the energy storage battery is smaller than a preset return point state value, the following steps are specifically implemented:
acquiring a current capacity state value of the energy storage battery through the BMS;
and comparing the current capacity state value of the energy storage battery with a preset return point state value to determine whether the current capacity state value of the energy storage battery is smaller than the return point state value.
In some embodiments, when the processor executes the program instruction to implement the step of adjusting the frequency of the off-grid photovoltaic energy storage system to a preset frequency hopping frequency if the frequency is greater than or equal to the frequency hopping point state value, the following steps are specifically implemented:
when the current capacity state value is determined to be larger than or equal to the frequency hopping point state value, the EMS in the off-grid photovoltaic energy storage system adjusts the frequency of the off-grid photovoltaic energy storage system to the frequency hopping frequency.
In some embodiments, when the processor executes the program instruction to implement the step of adjusting the frequency of the off-grid photovoltaic energy storage system to the operating frequency if the frequency is smaller than the return point state value, the following steps are specifically implemented:
when the current capacity state value is smaller than the return point state value, the EMS in the off-grid photovoltaic energy storage system adjusts the frequency of the off-grid photovoltaic energy storage system to the working frequency.
In some embodiments, the processor executes the program instruction to implement that, if the current capacity state value of the energy storage battery is greater than or equal to the frequency hopping point state value, the frequency of the off-grid photovoltaic energy storage system is adjusted to a preset frequency hopping frequency, so that when the photovoltaic inverter is shut down due to over-frequency protection, the following steps are specifically implemented:
if the current voltage value of the energy storage battery is larger than or equal to the voltage value of the frequency hopping point, or if the current SOC of the energy storage battery is larger than or equal to the SOC of the frequency hopping point, adjusting the frequency of the off-grid photovoltaic energy storage system to a preset frequency hopping frequency, so that the photovoltaic inverter is shut down due to over-frequency protection.
In some embodiments, the processor, when executing the program instruction, implements that if the current capacity state value of the energy storage battery is smaller than the return point state value, adjusting the frequency of the off-grid photovoltaic energy storage system to the operating frequency, so that when the photovoltaic inverter resumes the operating step, the following steps are specifically implemented:
if the current voltage value of the energy storage battery is smaller than the voltage value of the return point and the current SOC of the energy storage battery is smaller than the SOC of the return point, adjusting the frequency of the off-grid photovoltaic energy storage system to a preset working frequency, and enabling the photovoltaic inverter to recover to work.
The storage medium may be a usb disk, a removable hard disk, a Read-Only Memory (ROM), a magnetic disk, or an optical disk, which can store various computer readable storage media.
Those of ordinary skill in the art will appreciate that the elements and algorithm steps of the examples described in connection with the embodiments disclosed herein may be embodied in electronic hardware, computer software, or combinations of both, and that the components and steps of the examples have been described in a functional general in the foregoing description for the purpose of illustrating clearly the interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
In the embodiments provided in the present invention, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative. For example, the division of each unit is only one logic function division, and there may be another division manner in actual implementation. For example, various elements or components may be combined or may be integrated into another system, or some features may be omitted, or not implemented.
The steps in the method of the embodiment of the invention can be sequentially adjusted, combined and deleted according to actual needs. The units in the device of the embodiment of the invention can be merged, divided and deleted according to actual needs. In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a storage medium. Based on such understanding, the technical solution of the present invention essentially or partially contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a terminal, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention.
While the invention has been described with reference to specific embodiments, the invention is not limited thereto, and various equivalent modifications and substitutions can be easily made by those skilled in the art within the technical scope of the invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (9)

1. An off-grid photovoltaic energy storage system control method is applied to an off-grid photovoltaic energy storage system, a photovoltaic inverter in the off-grid photovoltaic energy storage system is connected into the off-grid photovoltaic energy storage system through a bus, and the photovoltaic inverter can charge an energy storage battery in the off-grid photovoltaic energy storage system through the bus, and is characterized by comprising the following steps of:
when the off-grid photovoltaic energy storage system is at the working frequency, determining whether the current capacity state value of the energy storage battery is greater than or equal to a preset frequency hopping point state value;
if the current capacity state value of the energy storage battery is larger than or equal to the frequency hopping point state value, adjusting the frequency of the off-grid photovoltaic energy storage system to a preset frequency hopping frequency, so that the photovoltaic inverter is stopped due to over-frequency protection;
when the off-grid photovoltaic energy storage system is in the frequency hopping frequency, determining whether the current capacity state value of the energy storage battery is smaller than a preset return point state value, wherein the return point state value is smaller than the frequency hopping point state value;
and if the current capacity state value of the energy storage battery is smaller than the return point state value, adjusting the frequency of the off-grid photovoltaic energy storage system to the working frequency, so that the photovoltaic inverter recovers to work.
2. The method according to claim 1, wherein the determining whether the current capacity state value of the energy storage battery is greater than or equal to a preset frequency hopping point state value comprises:
acquiring a current capacity state value of the energy storage battery through a BMS in the off-grid photovoltaic energy storage system;
and comparing the current capacity state value of the energy storage battery with a preset frequency hopping point state value to determine whether the current capacity state value of the energy storage battery is greater than or equal to the frequency hopping point state value.
3. The method of claim 2, wherein determining whether the current state of capacity value of the energy storage battery is less than a preset return point state value comprises:
acquiring a current capacity state value of the energy storage battery through the BMS;
and comparing the current capacity state value of the energy storage battery with a preset return point state value to determine whether the current capacity state value of the energy storage battery is smaller than the return point state value.
4. The method according to claim 3, wherein if the current capacity state value of the energy storage battery is greater than or equal to the frequency hopping point state value, adjusting the frequency of the off-grid photovoltaic energy storage system to a preset frequency hopping frequency comprises:
when the current capacity state value is determined to be larger than or equal to the frequency hopping point state value, the EMS in the off-grid photovoltaic energy storage system adjusts the frequency of the off-grid photovoltaic energy storage system to the frequency hopping frequency.
5. The method of claim 3, wherein adjusting the frequency of the off-grid photovoltaic energy storage system to the operating frequency if the current capacity state value of the energy storage battery is less than the return point state value comprises:
when the current capacity state value is smaller than the return point state value, the EMS in the off-grid photovoltaic energy storage system adjusts the frequency of the off-grid photovoltaic energy storage system to the working frequency.
6. The method according to any one of claims 1 to 5, wherein if the current capacity state value of the energy storage battery is greater than or equal to the frequency hopping point state value, adjusting the frequency of the off-grid photovoltaic energy storage system to a preset frequency hopping frequency so that the photovoltaic inverter is shut down due to over-frequency protection, includes:
if the current voltage value of the energy storage battery is greater than or equal to the voltage value of the frequency hopping point, or the current SOC of the energy storage battery is greater than or equal to the SOC of the frequency hopping point, adjusting the frequency of the off-grid photovoltaic energy storage system to a preset frequency hopping frequency, so that the photovoltaic inverter is shut down due to over-frequency protection;
if the current capacity state value of the energy storage battery is smaller than the return point state value, adjusting the frequency of the off-grid photovoltaic energy storage system to the working frequency, so that the photovoltaic inverter recovers to work, and the method comprises the following steps:
if the current voltage value of the energy storage battery is smaller than the voltage value of the return point and the current SOC of the energy storage battery is smaller than the SOC of the return point, adjusting the frequency of the off-grid photovoltaic energy storage system to the working frequency, and enabling the photovoltaic inverter to recover to work.
7. An off-grid photovoltaic energy storage device configured in an off-grid photovoltaic energy storage system, wherein a photovoltaic inverter in the off-grid photovoltaic energy storage system is connected to the off-grid photovoltaic energy storage system through a bus, and the photovoltaic inverter can charge an energy storage battery in the off-grid photovoltaic energy storage system through the bus, the device comprising:
the first determining unit is used for determining whether the current capacity state value of the energy storage battery is greater than or equal to a preset frequency hopping point state value or not when the off-grid photovoltaic energy storage system is at the working frequency;
the first adjusting unit is used for adjusting the frequency of the off-grid photovoltaic energy storage system to a preset frequency hopping frequency when the current capacity state value is larger than or equal to the frequency hopping point state value, so that the photovoltaic inverter is stopped due to over-frequency protection;
the second determining unit is used for determining whether the current capacity state value of the energy storage battery is smaller than a preset return point state value when the off-grid photovoltaic energy storage system is in the frequency hopping frequency, wherein the return point state value is smaller than the frequency hopping point state value;
and the second adjusting unit is used for adjusting the frequency of the off-grid photovoltaic energy storage system to the working frequency when the current capacity state value is smaller than the return point state value, so that the photovoltaic inverter can recover to work.
8. A computer arrangement, characterized in that the computer arrangement comprises a memory having stored thereon a computer program and a processor implementing the method according to any of claims 1-6 when executing the computer program.
9. A storage medium, characterized in that the storage medium stores a computer program comprising program instructions which, when executed by a processor, implement the method according to any one of claims 1-6.
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CN117117905B (en) * 2023-10-23 2024-03-12 国网江西省电力有限公司电力科学研究院 Primary frequency modulation control method and system based on light storage coordination

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