CN113381472B - Charge-discharge control method and device and two-phase energy storage system - Google Patents
Charge-discharge control method and device and two-phase energy storage system Download PDFInfo
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- CN113381472B CN113381472B CN202110577343.4A CN202110577343A CN113381472B CN 113381472 B CN113381472 B CN 113381472B CN 202110577343 A CN202110577343 A CN 202110577343A CN 113381472 B CN113381472 B CN 113381472B
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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
- H02J7/00032—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by data exchange
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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
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
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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
- H02J7/00304—Overcurrent protection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
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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
- H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters
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- Engineering & Computer Science (AREA)
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- Supply And Distribution Of Alternating Current (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
Abstract
The embodiment of the invention relates to the technical field of battery storage, and discloses a charging and discharging control method, a charging and discharging control device and a two-phase energy storage system, wherein the system comprises a battery and a two-phase bidirectional inverter, the battery is connected with the two-phase bidirectional inverter, the battery is used for storing energy, and the inverter is used for controlling the charging and discharging of two phases of the two-phase energy storage system.
Description
Technical Field
The embodiment of the invention relates to the technical field of battery storage, in particular to a charging and discharging control method and device and a two-phase energy storage system.
Background
Along with the reduction of the cost of the battery and the improvement of the awareness of people on clean energy, household energy storage products are more and more used as household appliances and appear in thousands of households, a battery energy storage system can be divided into single-phase energy storage and multi-phase energy storage according to a power supply mode, and the multi-phase energy storage can be further refined into a two-phase system (also called a single-wire three-wire system) and a three-phase system. In recent years, energy storage products are increasingly diversified in application mode, the application mode is generally called as a functional mode, the functional modes provided by the energy storage products are various, a peak clipping and valley filling mode, a backup power supply mode, a matched load mode and the like are common, and a plurality of targeted functional modes appear in some regions or countries due to differences of practical application.
In implementing the embodiments of the present invention, the inventors found that at least the following problems exist in the above related art: at present, a power supply agreement is required to be signed by a Japanese family user and a power grid company, wherein the requirement of 'contract ampere number' is provided, namely, the maximum current of the family for buying the electricity from the power grid is allowed, so that the total current of the electrical appliances is prevented from being larger than the signed 'contract ampere number' when the Japanese family distributes the electricity or purchases the electrical appliances. In order to avoid the situation that the current of the total electric equipment is larger than the signed contract ampere number, the 'finely-calculated' life style is adopted to select electric equipment or configure a household power grid, so that the life quality of a user is greatly reduced.
Disclosure of Invention
The embodiment of the application provides a charge and discharge control method and device and a two-phase energy storage system.
The purpose of the embodiment of the invention is realized by the following technical scheme:
in order to solve the above technical problem, in a first aspect, an embodiment of the present invention provides a charge and discharge control method applied to a two-phase energy storage system, where the two-phase energy storage system includes a battery and a two-phase bidirectional inverter, the battery is connected to the two-phase bidirectional inverter, the battery is used for storing energy, and the inverter is used for controlling charge and discharge of two phases of the two-phase energy storage system, and the method includes:
acquiring contract current ampere times;
determining the target current of the two-phase bidirectional inverter according to the contract current ampere times;
and controlling the two-phase bidirectional inverter to perform charging and discharging according to the target current through feedback regulation.
In some embodiments, the two-phase energy storage system further includes a network element management system and a human-computer interaction system, the network element management system is connected to the human-computer interaction system through a communication circuit,
the obtaining of the contract current ampere multiple further comprises:
and acquiring the contract current amperage through a communication network between the network element management system and the human-computer interaction system.
In some embodiments, the feedback regulation is a current closed loop feedback regulation of the output current of the two-phase bidirectional inverter,
determining a target current of the two-phase bidirectional inverter according to the contract current ampere multiple, further comprising:
and determining a target current for carrying out current closed-loop feedback regulation according to the contract current ampere multiple.
In some embodiments, the controlling the two-phase bidirectional inverter to charge and discharge according to the target current through feedback regulation further includes:
determining a feedback quantity for performing current closed-loop feedback regulation;
according to the target current and the feedback quantity, the current of the inverter is linearly regulated;
and judging whether the regulated real-time output current of the inverter reaches the target current or not so as to determine that the two-phase bidirectional inverter performs charging and discharging according to the target current.
In some embodiments, the determining whether the regulated real-time output current of the inverter reaches the target current further includes:
acquiring state data of the battery and the inverter;
determining charge and discharge limit values of the battery and the inverter according to the state data;
determining a charge-discharge state of the inverter;
and judging whether the output current of the two-phase bidirectional inverter reaches the target current or not by combining the charge-discharge state and the charge-discharge limit value.
In some embodiments, the two-phase energy storage system further comprises:
a battery management system, one end of which is connected with the battery, the other end of which is connected with the network element management system through the communication circuit,
the network element management system is also connected with the two-phase bidirectional inverter through a communication circuit,
the acquiring state data of the battery and the inverter further includes:
acquiring state data of the battery through a communication network of the network element management system and the battery management system;
and acquiring the state data of the two-phase bidirectional inverter through the network element management system and the communication network of the inverter.
In some embodiments, the determining whether the output current of the two-phase bidirectional inverter reaches the target current by combining the charge-discharge state and the state data further includes:
if the inverter is in a charging state, judging whether the output current of the two-phase bidirectional inverter is correspondingly less than or equal to the maximum charging current limit value of the two-phase bidirectional inverter or not, and whether the sum of the target currents of the two-phase bidirectional inverter is less than or equal to the maximum charging current limit value of the battery or not;
and if so, determining that the output current of the two-phase bidirectional inverter reaches the target current.
In some embodiments, the determining whether the output current of the two-phase bidirectional inverter reaches the target current by combining the charge-discharge state and the state data further includes:
if the inverter is in a discharging state, judging whether the output current of the two-phase bidirectional inverter is correspondingly less than or equal to the maximum discharging current limit value of the two-phase bidirectional inverter or not, and whether the sum of the target currents of the two-phase bidirectional inverter is less than or equal to the maximum discharging current limit value of the battery or not;
and if so, determining that the output current of the two-phase bidirectional inverter reaches the target current.
In order to solve the above technical problem, in a second aspect, an embodiment of the present invention provides a charge and discharge control device applied to a two-phase energy storage system, where the two-phase energy storage system includes a battery and a two-phase bidirectional inverter, the battery is connected to the two-phase bidirectional inverter, the battery is used for storing energy, and the inverter is used for controlling charge and discharge of two phases of the two-phase energy storage system, and the device includes:
the acquisition module is used for acquiring contract current ampere times;
the determining module is used for determining the target current of the two-phase bidirectional inverter according to the contract current ampere multiple;
and the control module is used for controlling the two-phase bidirectional inverter to carry out charging and discharging according to the target current through feedback regulation.
In order to solve the foregoing technical problem, in a third aspect, an embodiment of the present invention provides a two-phase energy storage system, including:
a battery;
two-phase loading;
two-phase photovoltaic and/or two-phase grid;
a bidirectional inverter, one end of which is connected to the battery and the other end of which is connected to the two-phase load and the two-phase photovoltaic and/or the two-phase grid, respectively;
at least one processor connected to the bi-directional inverter; and the number of the first and second groups,
a memory communicatively coupled to the at least one processor; wherein the content of the first and second substances,
the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the method of the first aspect as described above.
In order to solve the above technical problem, in a fourth aspect, an embodiment of the present invention further provides a computer-readable storage medium storing computer-executable instructions for causing a computer to perform the method according to the first aspect.
In order to solve the above technical problem, in a fifth aspect, the present invention further provides a computer program product, which includes a computer program stored on a computer-readable storage medium, the computer program including program instructions, which, when executed by a computer, cause the computer to execute the method according to the first aspect.
Compared with the prior art, the invention has the beneficial effects that: different from the situation of the prior art, the embodiment of the invention provides a charge and discharge control method, a charge and discharge control device and a two-phase energy storage system, wherein the system comprises a battery and a two-phase bidirectional inverter, the battery is connected with the two-phase bidirectional inverter, the battery is used for storing energy, and the inverter is used for controlling the charge and discharge of two phases of the two-phase energy storage system.
Drawings
One or more embodiments are illustrated by the accompanying drawings, which are not meant to be limiting, in which elements/modules and steps having the same reference number designation may be represented by like elements/modules and steps throughout the drawings, and in which the drawings are not to scale unless otherwise specified.
Fig. 1 is a schematic structural diagram of one application environment of a charge and discharge control method according to an embodiment of the present invention;
fig. 2 is a schematic view of a communication topology of a two-phase energy storage system in the application scenario shown in fig. 1;
fig. 3 is a schematic flow chart of a charging and discharging control method according to an embodiment of the present invention;
FIG. 4 is a schematic view of a sub-flow of step 130 of the charge and discharge control method shown in FIG. 3;
FIG. 5 is a schematic flow chart illustrating a sub-process of step 133 of the charge/discharge control method shown in FIG. 4;
fig. 6 is a schematic structural diagram of a charge and discharge control device according to a second embodiment of the present invention;
fig. 7 is a schematic structural diagram of a two-phase energy storage system according to a third embodiment of the present invention.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications can be made by persons skilled in the art without departing from the spirit of the invention. All falling within the scope of the present invention.
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
It should be noted that, if not conflicted, the various features of the embodiments of the invention may be combined with each other within the scope of protection of the present application. Additionally, while functional block divisions are performed in apparatus schematics, with logical sequences shown in flowcharts, in some cases, steps shown or described may be performed in sequences other than block divisions in apparatus or flowcharts. It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may be present.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. 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 herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
In order to solve the problem that a household user needs to pay attention to the selection of household appliances according to the contract ampere multiple condition in the power utilization protocol signed with a power grid at home and control the number of the household appliances used at the same time in the current countries such as Japan, the embodiment of the invention provides a charge and discharge control method, which can intelligently adjust the electric equipment in a system according to the contract current and the multiple condition, thereby meeting the requirement on the maximum current in the power supply protocol of the power grid.
Fig. 1 is a schematic structural diagram of one application environment of a charge and discharge control method according to an embodiment of the present invention, and fig. 2 is a schematic communication topology diagram of a two-phase energy storage system in an application scenario shown in fig. 1, where the application environment is a two-phase energy storage system 10, and the two-phase energy storage system 10 includes: a battery 11, a two-phase bidirectional inverter 12, a two-phase load 13, a two-phase photovoltaic 14, and a two-phase grid 15. Further, the two-phase energy storage system 10 further includes: a network element management system 16 and a human-computer interaction system 17.
The two-phase energy storage system 10 is a multi-phase energy storage system, also referred to as a single-phase three-wire system or a dual-fire wire system, and in the examples shown in fig. 1 and 2, two phases of the two-phase energy storage system 10 are represented by L1 phase and L2 phase, respectively, and the L1 phase and the L2 phase are offset by 180 degrees.
The battery 11 is a device for storing electric energy, the battery 11 may be a single battery or a battery pack, the battery 11 may be a lithium battery, a lead storage battery, a dry battery, or the like, and specifically, the number, capacity, type, or the like of the batteries 11 may be set according to actual situations, and need not be limited by the application context.
The two-phase energy storage system 10 is further provided with a BATTERY management system 11a (BATTERY MANAGEMENT SYSTEM, BMS), the BATTERY management system 11a is connected with the BATTERY 11, the BATTERY management system 11a can manage the BATTERY or the BATTERY pack in the system, and is mainly responsible for voltage acquisition, current acquisition, temperature control, BATTERY power calculation and the like of the BATTERY or the BATTERY pack, and the BATTERY or the BATTERY pack can be a chip, a printed circuit board, a circuit and the like, and can be specifically set according to actual needs.
The two-phase bidirectional inverter 12 includes an L1-phase inverter 12a and an L2-phase inverter 12b, the L1-phase inverter 12a and the L2-phase inverter 12b are shifted in phase by 180 degrees, the bidirectional inverter 12 is a power supply device capable of performing DC/AC and AC/DC conversion, and is capable of charging and discharging the battery 11, and a power supply can charge the battery 11 through the bidirectional inverter 12, and the battery 11 can also supply power to the load 13 through the bidirectional inverter 12.
The two-phase load 13 includes an L1-phase load 13a and an L2-phase load 13b, and the load 13 is an electric device in the two-phase energy storage system 10, and specifically may be a light bulb, a computer, a refrigerator, an induction cooker, or other household appliances.
The two-phase photovoltaic 14 includes an L1 phase photovoltaic 14a and an L2 phase photovoltaic 14b, the photovoltaic 14 obtains solar energy and converts the solar energy into the electric energy, and then sends the electric energy to the battery 11 through the inverter 12 for storage, or directly pushes the load 13 to work, and is generally composed of at least a solar panel, and may further include a voltage and/or current adjusting circuit, and/or a storage battery, etc., and is specifically selected according to actual needs.
The two-phase grid 15 includes an L1 phase grid 15a and an L2 phase grid 15b, and the grid 15 may be a device capable of converting AC utility power to dc power and providing power.
The network element management system 16 (EMS) is a device for implementing communication network management in the two-phase energy storage system 10, and at least can implement communication of an internal network of the two-phase energy storage system 10, and may be a microcontroller, a server, a management control module or a system, and the like.
The Human Machine Interface (HMI) 17 is a system capable of receiving a user instruction, is a medium for interaction and information exchange between a system and a user, and may be a keyboard, a button, or a tablet, a computer, a mobile device, and the like having an interactive Interface, and may be specifically set and selected according to actual needs.
Referring to fig. 1, in the two-phase bidirectional inverter 12, the output terminal of the L1 phase inverter 12a is electrically connected to the L1 phase load 13a, the photovoltaic 14a and the grid 15a through the connection circuit 18a, the output terminal of the L2 phase inverter 12b is electrically connected to the L2 phase load 13b, the photovoltaic 14b and the grid 15b through the connection circuit 18b, and the input terminals of the two-phase bidirectional inverter 12(12a and 12b) are electrically connected to the battery 11 through the connection circuit 18 c.
Referring to fig. 2, the cell management system 16 is communicatively connected to the battery management system 11a through a communication circuit 19a, communicatively connected to the two-phase bidirectional inverter 12(12a and 12B) through a communication circuit 19B, communicatively connected to the two-phase photovoltaic 14 through a communication circuit 19C, communicatively connected to the two-phase power grid 15 through a communication circuit 19D, and communicatively connected to the human-machine interaction system 17 through a communication circuit 19 e. The L1 phase inverter 12a is connected to the L2 phase inverter 12b via the communication circuit 19b, the L1 phase pv 14a is connected to the L2 phase pv 14b via the communication circuit 19c, and the L1 phase grid 15a is connected to the L2 phase grid 15b via the communication circuit 19 d. The communication circuit between the element management system 16 and the photovoltaic system 14 and the power grid 15 actually uses electric meter equipment.
Specifically, the embodiments of the present invention will be further explained below with reference to the drawings.
Example one
An embodiment of the present invention provides a charging and discharging control method, please refer to fig. 3, which illustrates a flow of the charging and discharging control method provided in an embodiment of the present invention, and the method can be applied to a two-phase energy storage system as shown in the above application scenario, where the two-phase energy storage system includes a battery and a two-phase bidirectional inverter, the battery is connected to the two-phase bidirectional inverter, the battery is used for storing energy, and the inverter is used for controlling charging and discharging of two phases of the two-phase energy storage system, and the method includes, but is not limited to, the following steps:
step 110: acquiring contract current ampere times;
the two-phase energy storage system further comprises a network element management system and a human-computer interaction system, the network element management system is connected with the human-computer interaction system through a communication circuit, and the acquiring of the contract current safety multiple further comprises: and acquiring the contract current amperage through a communication network between the network element management system and the human-computer interaction system. In the embodiment of the present invention, the contract current ampere multiple is issued to the network element management system by the user through the human-computer interaction system, and the contract current ampere multiple signed by the network element management system through the human-computer interaction system mobile phone user and the power grid company by the human-computer interaction system may be obtained in other embodiments by other means, and may be specifically set according to actual needs.
Step 120: determining the target current of the two-phase bidirectional inverter according to the contract current ampere times;
the feedback regulation is current closed loop feedback regulation performed on the output current of the two-phase bidirectional inverter, and the determining of the target current of the two-phase bidirectional inverter according to the contract current ampere multiple further includes: and determining a target current for carrying out current closed-loop feedback regulation according to the contract current ampere multiple. In the embodiment of the present invention, after the contract current ampere multiple is determined, the current limit value that each phase of load can operate may be set according to a user requirement or default setting, that is, the target current is determined, so that finally, the total charging and discharging current of the system can approach the contract current ampere multiple and does not exceed the contract current ampere multiple.
Step 130: and controlling the two-phase bidirectional inverter to perform charging and discharging according to the target current through feedback regulation.
In the embodiment of the present invention, the output current of the inverter is adjusted in an interfering manner through a closed-loop feedback adjustment so as to enable the inverter to perform charging and discharging according to a target current, so as to fully utilize the maximum charging and discharging current of the system, specifically, referring to fig. 4, which shows a sub-flow of step 130 in the charging and discharging control method shown in fig. 3, and the controlling the two-phase bidirectional inverter to perform charging and discharging according to the target current through the feedback adjustment further includes the following steps:
step 131: determining a feedback quantity for performing current closed-loop feedback regulation;
step 132: according to the target current and the feedback quantity, the current of the inverter is linearly regulated;
step 133: and judging whether the regulated real-time output current of the inverter reaches the target current or not so as to determine that the two-phase bidirectional inverter performs charging and discharging according to the target current.
Specifically, referring to fig. 5, which shows a sub-process of step 133 in the charge and discharge control method shown in fig. 4, the determining whether the regulated real-time output current of the inverter reaches the target current further includes the following steps:
step 1331: acquiring state data of the battery and the inverter;
as shown in fig. 1 and fig. 2 and the application scenario, the two-phase energy storage system further includes: a battery management system, one end of which is connected to the battery, the other end of which is connected to the network element management system through the communication circuit, the network element management system is also connected to the two-phase bidirectional inverter through the communication circuit, and the acquiring of the state data of the battery and the inverter further includes: acquiring state data of the battery through a communication network of the network element management system and the battery management system; and acquiring the state data of the two-phase bidirectional inverter through the network element management system and the communication network of the inverter.
Step 1332: determining charge and discharge limit values of the battery and the inverter according to the state data;
the state data of the battery may include data of capacity, state of charge, total voltage, medium current, charge and discharge rate of the battery, voltage and/or temperature of a single battery, and according to the state data of each phase of the battery, that is, information of each phase of the battery, a maximum charging current limit value allowed for charging and a maximum discharging current limit value allowed for discharging of the battery may be calculated. The state data of the inverter, that is, the information of each phase of the inverter, may include data such as control current, output power, and/or temperature of the inverter, and the maximum charging current limit value and the maximum discharging current limit value of the inverter may be calculated according to the state data of each phase of the inverter. Furthermore, the voltage, power and/or current of the power grid can be collected according to a communication circuit passing through the network element management system and the power grid, and/or the voltage, power and/or current of the photovoltaic can be collected through a communication circuit passing through the network element management system and the photovoltaic.
Step 1333: determining a charge-discharge state of the inverter;
specifically, the charge-discharge state of the inverter may be determined by a current direction through the inverter, the charge state being determined when a current flows to the battery, and the discharge state being determined when a large current flows to the load.
Step 1334: and judging whether the output current of the two-phase bidirectional inverter reaches the target current or not by combining the charge-discharge state and the charge-discharge limit value.
Specifically, if the inverter is in a charging state, it is determined whether the output current of the two-phase bidirectional inverter corresponds to a maximum charging current limit value that is less than or equal to the two-phase bidirectional inverter, and whether the sum of target currents of the two-phase bidirectional inverter is less than or equal to the maximum charging current limit value of the battery; and if so, determining that the output current of the two-phase bidirectional inverter reaches the target current.
Or, if the inverter is in a discharging state, judging whether the output current of the two-phase bidirectional inverter is correspondingly less than or equal to the maximum discharging current limit value of the two-phase bidirectional inverter, and whether the sum of the target currents of the two-phase bidirectional inverter is less than or equal to the maximum discharging current limit value of the battery; and if so, determining that the output current of the two-phase bidirectional inverter reaches the target current.
Example two
An embodiment of the present invention provides a charging and discharging control device, please refer to fig. 6, which shows a structure of a charging and discharging control device provided in an embodiment of the present invention, where the charging and discharging control device 200 can be applied to the two-phase energy storage system 10 described in the above application scenario, the two-phase energy storage system includes a battery and a two-phase bidirectional inverter, the battery is connected to the two-phase bidirectional inverter, the battery is used for storing energy, the inverter is used for controlling charging and discharging of two phases of the two-phase energy storage system, and the device 200 includes: an acquisition module 210, a determination module 220, and a control module 230.
The obtaining module 210 is configured to obtain an ampere multiple of the contract current;
the determining module 220 is configured to determine a target current of the two-phase bidirectional inverter according to the contract current ampere multiple;
the control module 230 is configured to control the two-phase bidirectional inverter to perform charging and discharging according to the target current through feedback regulation.
In some embodiments, the two-phase energy storage system further includes a network element management system and a human-computer interaction system, the network element management system is connected to the human-computer interaction system through a communication circuit,
the obtaining module 210 is further configured to obtain the contract current amperage through a communication network between the network element management system and the human-computer interaction system.
In some embodiments, the feedback adjustment is a current closed-loop feedback adjustment performed on the output current of the two-phase bidirectional inverter, and the determining module 220 is further configured to determine a target current for performing the current closed-loop feedback adjustment according to the contract current ampere multiple.
In some embodiments, the control module 230 is further configured to determine a feedback amount for performing a current closed-loop feedback adjustment;
according to the target current and the feedback quantity, the current of the inverter is linearly regulated;
and judging whether the regulated real-time output current of the inverter reaches the target current or not so as to determine that the two-phase bidirectional inverter performs charging and discharging according to the target current.
In some embodiments, the control module 230 is further configured to obtain status data of the battery and the inverter;
determining charge and discharge limit values of the battery and the inverter according to the state data;
determining a charge-discharge state of the inverter;
and judging whether the output current of the two-phase bidirectional inverter reaches the target current or not by combining the charge-discharge state and the charge-discharge limit value.
In some embodiments, the two-phase energy storage system further comprises:
a battery management system, one end of which is connected with the battery, the other end of which is connected with the network element management system through the communication circuit,
the network element management system is also connected with the two-phase bidirectional inverter through a communication circuit,
the control module 230 is further configured to obtain status data of the battery through a communication network of the network element management system and the battery management system;
and acquiring the state data of the two-phase bidirectional inverter through the network element management system and the communication network of the inverter.
In some embodiments, the control module 230 is further configured to determine whether the output current of the two-phase bidirectional inverter is less than or equal to the maximum charging current limit of the two-phase bidirectional inverter and the sum of the target currents of the two-phase bidirectional inverter is less than or equal to the maximum charging current limit of the battery if the inverter is in the charging state;
and if so, determining that the output current of the two-phase bidirectional inverter reaches the target current.
In some embodiments, the control module 230 is further configured to determine whether the output current of the two-phase bidirectional inverter is less than or equal to the maximum discharge current limit of the two-phase bidirectional inverter and the sum of the target currents of the two-phase bidirectional inverter is less than or equal to the maximum discharge current limit of the battery if the inverter is in the discharge state;
and if so, determining that the output current of the two-phase bidirectional inverter reaches the target current.
In some embodiments, the control module 230 is further configured to
EXAMPLE III
An embodiment of the present invention further provides a two-phase energy storage system, please refer to fig. 7, which shows a hardware structure of a server capable of executing the charging and discharging control method described in fig. 3 to fig. 5. The two-phase energy storage system 10 may be the two-phase energy storage system 10 shown in fig. 1 and/or fig. 2.
The two-phase energy storage system 10 includes: a battery 11; a two-phase load 13; two-phase photovoltaic 14 and/or two-phase grid 15; a bidirectional inverter 12 having one end connected to the battery 11 and the other end connected to the two-phase load 13, the two-phase photovoltaic 14, and/or the two-phase grid 15; at least one processor 101 connected to said bidirectional inverter 12; and a memory 102 communicatively coupled to the at least one processor 101, with one processor 101 being illustrated in fig. 7.
The memory 102 stores instructions executable by the at least one processor 101, and the instructions are executed by the at least one processor 101, so that the at least one processor 101 can execute the charging and discharging control method described in fig. 3 to 5. The processor 101 and the memory 102 may be connected by a bus or other means, and fig. 7 illustrates the connection by a bus as an example.
The memory 102, which is a non-volatile computer-readable storage medium, may be used to store non-volatile software programs, non-volatile computer-executable programs, and modules, such as program instructions/modules corresponding to the charging and discharging control method in the embodiment of the present application, for example, the respective modules shown in fig. 6. The processor 101 executes various functional applications and data processing of the server by running nonvolatile software programs, instructions and modules stored in the memory 102, so as to implement the charging and discharging control method of the above method embodiment.
The memory 102 may include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function; the storage data area may store data created according to use of the charge and discharge control device, and the like. Further, the memory 102 may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid state storage device. In some embodiments, the memory 102 may optionally include a memory remotely located from the processor 101, and these remote memories may be connected to the charge and discharge control device via a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
The one or more modules are stored in the memory 102, and when executed by the one or more processors 101, perform the charging and discharging control method in any of the above-described method embodiments, for example, perform the method steps of fig. 3 to 5 described above, and implement the functions of the modules and units in fig. 6.
The product can execute the method provided by the embodiment of the application, and has the corresponding functional modules and beneficial effects of the execution method. For technical details that are not described in detail in this embodiment, reference may be made to the methods provided in the embodiments of the present application.
Embodiments of the present application also provide a non-transitory computer-readable storage medium storing computer-executable instructions for execution by one or more processors, for example, to perform the method steps of fig. 3-5 described above to implement the functions of the modules in fig. 6.
Embodiments of the present application further provide a computer program product, including a computer program stored on a non-volatile computer-readable storage medium, where the computer program includes program instructions, which, when executed by a computer, cause the computer to execute a charging and discharging control method in any of the above method embodiments, for example, to execute the method steps in fig. 3 to 5 described above, and implement the functions of the modules in fig. 6.
The embodiment of the invention provides a charge-discharge control method, a charge-discharge control device and a two-phase energy storage system, wherein the system comprises a battery and a two-phase bidirectional inverter, the battery is connected with the two-phase bidirectional inverter, the battery is used for storing energy, the inverter is used for controlling the charge and discharge of two phases of the two-phase energy storage system, the method can determine the target current of the two-phase bidirectional inverter according to the contract current safety multiple, and then the two-phase bidirectional inverter is controlled to charge and discharge according to the target current through feedback regulation.
It should be noted that the above-described device embodiments are merely illustrative, where the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a general hardware platform, and certainly can also be implemented by hardware. It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware related to instructions of a computer program, which can be stored in a computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), or the like.
Finally, it should be noted that: the above examples are only used to illustrate the technical solution of the present invention, not to limit the same; within the idea of the invention, also technical features in the above embodiments or in different embodiments may be combined, steps may be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A charge and discharge control method is characterized by being applied to a two-phase energy storage system, wherein the two-phase energy storage system comprises a battery, a two-phase bidirectional inverter, a network element management system and a human-computer interaction system, the battery is connected with the two-phase bidirectional inverter, the battery is used for storing energy, the inverter is used for controlling the charge and discharge of two phases of the two-phase energy storage system, and the network element management system is connected with the human-computer interaction system through a communication circuit, and the method comprises the following steps:
acquiring contract current ampere-multiple through a communication network between the network element management system and the human-computer interaction system;
determining the target current of the two-phase bidirectional inverter according to the contract current ampere times;
and controlling the two-phase bidirectional inverter to perform charging and discharging according to the target current through feedback regulation.
2. The charge-discharge control method according to claim 1,
the feedback regulation is a current closed loop feedback regulation of the output current of the two-phase bidirectional inverter,
determining a target current of the two-phase bidirectional inverter according to the contract current ampere multiple, further comprising:
and determining a target current for carrying out current closed-loop feedback regulation according to the contract current ampere multiple.
3. The charge-discharge control method according to claim 2,
the controlling the two-phase bidirectional inverter to perform charging and discharging according to the target current through feedback regulation further comprises:
determining a feedback quantity for performing current closed-loop feedback regulation;
according to the target current and the feedback quantity, the current of the inverter is linearly regulated;
and judging whether the regulated real-time output current of the inverter reaches the target current or not so as to determine that the two-phase bidirectional inverter performs charging and discharging according to the target current.
4. The charge-discharge control method according to claim 3,
the determining whether the regulated real-time output current of the inverter reaches the target current further includes:
acquiring state data of the battery and the inverter;
determining charge and discharge limit values of the battery and the inverter according to the state data;
determining a charge-discharge state of the inverter;
and judging whether the output current of the two-phase bidirectional inverter reaches the target current or not by combining the charge-discharge state and the charge-discharge limit value.
5. The charge-discharge control method according to claim 4,
the two-phase energy storage system further comprises:
a battery management system, one end of which is connected with the battery, the other end of which is connected with the network element management system through the communication circuit,
the network element management system is also connected with the two-phase bidirectional inverter through a communication circuit,
the acquiring state data of the battery and the inverter further includes:
acquiring state data of the battery through a communication network of the network element management system and the battery management system;
and acquiring the state data of the two-phase bidirectional inverter through the network element management system and the communication network of the inverter.
6. The charge-discharge control method according to claim 4,
the determining whether the output current of the two-phase bidirectional inverter reaches the target current by combining the charge-discharge state and the charge-discharge limit value further includes:
if the inverter is in a charging state, judging whether the output current of the two-phase bidirectional inverter is correspondingly less than or equal to the maximum charging current limit value of the two-phase bidirectional inverter or not, and whether the sum of the target currents of the two-phase bidirectional inverter is less than or equal to the maximum charging current limit value of the battery or not;
and if so, determining that the output current of the two-phase bidirectional inverter reaches the target current.
7. The charge-discharge control method according to claim 4,
the determining whether the output current of the two-phase bidirectional inverter reaches the target current by combining the charge-discharge state and the charge-discharge limit value further includes:
if the inverter is in a discharging state, judging whether the output current of the two-phase bidirectional inverter is correspondingly less than or equal to the maximum discharging current limit value of the two-phase bidirectional inverter or not, and whether the sum of the target currents of the two-phase bidirectional inverter is less than or equal to the maximum discharging current limit value of the battery or not;
and if so, determining that the output current of the two-phase bidirectional inverter reaches the target current.
8. A charge and discharge control device is applied to a two-phase energy storage system, wherein the two-phase energy storage system comprises a battery, a two-phase bidirectional inverter, a network element management system and a human-computer interaction system, the battery is connected with the two-phase bidirectional inverter, the battery is used for storing energy, the inverter is used for controlling the charge and discharge of two phases of the two-phase energy storage system, the network element management system is connected with the human-computer interaction system through a communication circuit, and the device comprises:
the acquisition module is used for acquiring contract current ampere-multiple through a communication network between the network element management system and the human-computer interaction system;
the determining module is used for determining the target current of the two-phase bidirectional inverter according to the contract current ampere multiple;
and the control module is used for controlling the two-phase bidirectional inverter to carry out charging and discharging according to the target current through feedback regulation.
9. A two-phase energy storage system, comprising:
a battery;
two-phase loading;
two-phase photovoltaic and/or two-phase grid;
a bidirectional inverter, one end of which is connected to the battery and the other end of which is connected to the two-phase load and the two-phase photovoltaic and/or the two-phase grid, respectively;
at least one processor connected to the bi-directional inverter; and the number of the first and second groups,
a memory communicatively coupled to the at least one processor; wherein the content of the first and second substances,
the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the method of any one of claims 1-7.
10. A computer-readable storage medium having computer-executable instructions stored thereon for causing a computer to perform the method of any one of claims 1-7.
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| CN202110577343.4A CN113381472B (en) | 2021-05-26 | 2021-05-26 | Charge-discharge control method and device and two-phase energy storage system |
| JP2022558566A JP7457154B2 (en) | 2021-05-26 | 2022-04-06 | Charge/discharge control method, device and two-phase energy storage system |
| PCT/CN2022/085380 WO2022237394A1 (en) | 2021-05-26 | 2022-04-06 | Charge and discharge control method and apparatus, and two-phase energy storage system |
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| JP2004187383A (en) * | 2002-12-02 | 2004-07-02 | Toshiba Corp | System interconnected inverter device |
| JP2007300792A (en) * | 2003-01-09 | 2007-11-15 | Matsushita Electric Ind Co Ltd | Power source system |
| JP4175632B2 (en) * | 2003-08-27 | 2008-11-05 | 学校法人東京電機大学 | Power compensation system for single-phase three-wire distribution system |
| JP5117687B2 (en) * | 2006-06-07 | 2013-01-16 | 河村電器産業株式会社 | Grid interconnection inverter |
| JP2008042999A (en) * | 2006-08-02 | 2008-02-21 | Matsushita Electric Works Ltd | Power supply device |
| JP2010180003A (en) * | 2009-02-04 | 2010-08-19 | Saitama Univ | Elevator power supply apparatus |
| CN103187771B (en) * | 2011-12-31 | 2015-08-26 | 比亚迪股份有限公司 | Electric automobile and electric discharge device thereof |
| JP6018449B2 (en) * | 2012-07-30 | 2016-11-02 | 東芝ホームテクノ株式会社 | Battery system |
| CN203761319U (en) * | 2014-03-22 | 2014-08-06 | 深圳市德兰明海科技有限公司 | Comprehensive type distributed photovoltaic energy storage system |
| CN104538999B (en) * | 2014-12-03 | 2017-01-25 | 广州市香港科大霍英东研究院 | Photovoltaic generating energy storage system and energy scheduling method thereof |
| DE102017201734B4 (en) * | 2017-02-03 | 2018-09-13 | Volkswagen Aktiengesellschaft | Charger and method for reducing the unbalanced load of a two-phase charger |
| US9914548B1 (en) * | 2017-02-22 | 2018-03-13 | Imagik International Corporation | USB power management and load distribution system |
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| CN113381472B (en) * | 2021-05-26 | 2022-03-11 | 深圳市德兰明海科技有限公司 | Charge-discharge control method and device and two-phase energy storage system |
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