CN113346577B - Energy storage battery grid connection method - Google Patents
Energy storage battery grid connection method Download PDFInfo
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- CN113346577B CN113346577B CN202110573511.2A CN202110573511A CN113346577B CN 113346577 B CN113346577 B CN 113346577B CN 202110573511 A CN202110573511 A CN 202110573511A CN 113346577 B CN113346577 B CN 113346577B
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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
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/4207—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells for several batteries or cells 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
- H02J7/00032—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by data exchange
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
- H01M2010/4271—Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing
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- 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
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The invention relates to the technical field of energy storage systems, and particularly discloses an energy storage battery grid-connection method which is used for connecting an energy storage battery module to be grid-connected into an energy storage battery grid-connection system, wherein the energy storage battery grid-connection system comprises a main control module and a plurality of online energy storage battery modules; the grid connection method comprises the following steps: s1, sending a grid connection request instruction to a main control module by an energy storage battery module to be connected to the grid; s2, the master control module receives a grid-connected request instruction sent by the energy storage battery module to be connected to the grid, judges whether the energy storage battery module to be connected to the grid meets the grid-connected requirement or not, and returns a grid-connected allowing instruction or a grid-connected disallowing instruction; s3, after sending a grid-connection allowing instruction to the energy storage battery module to be connected to the grid, the main control module sends a query instruction to the plurality of online energy storage battery modules; when the energy storage battery module to be connected to the grid is connected, the energy storage battery grid-connected system does not need to be powered off to stop working, and meanwhile, a pre-charging circuit does not need to be built by a pre-charging resistor, so that the working efficiency of the energy storage battery grid-connected system is effectively improved.
Description
Technical Field
The invention relates to the technical field of energy storage systems, in particular to a grid connection method for an energy storage battery.
Background
In practical application, when a new energy storage battery module needs to be added to an energy storage battery grid-connected system, the whole energy storage battery grid-connected system needs to be powered off and stops working, meanwhile, a pre-charging circuit needs to be built through a pre-charging resistor, energy storage battery modules with the same specifications as other on-line energy storage battery modules, such as output voltage, battery residual capacity, current maximum output power, rated capacity, rated voltage, cell internal resistance and the like, need to be selected and installed in the energy storage battery grid-connected system, and the energy storage battery grid-connected system starts working after the energy storage battery grid-connected system is powered on again and tests prove to be free of problems.
Disclosure of Invention
Aiming at the problems that when a new energy storage battery module needs to be added to an energy storage battery grid-connected system, complicated steps of building a pre-charging circuit by a pre-charging resistor, selecting, testing and the like exist, and influence is caused on the work of the energy storage battery grid-connected system, the invention provides the energy storage battery grid-connected method.
In order to solve the technical problems, the invention provides the following specific scheme:
an energy storage battery grid-connection method is used for connecting an energy storage battery module to be grid-connected into an energy storage battery grid-connection system, wherein the energy storage battery grid-connection system comprises a main control module and a plurality of online energy storage battery modules;
the grid connection method comprises the following steps:
s1, the energy storage battery module to be connected to the grid sends a grid connection request instruction to a main control module;
s2, the main control module receives a grid connection request instruction sent by the energy storage battery module to be connected to the grid, judges whether the energy storage battery module to be connected to the grid meets the grid connection requirement or not, and returns a grid connection allowing instruction or a grid connection not allowing instruction;
s3, after the main control module sends a grid connection permission instruction to the energy storage battery modules to be connected to the grid, sending a query instruction to the plurality of online energy storage battery modules;
s4, after the plurality of online energy storage battery modules return query instructions to the main control module and the energy storage battery module to be connected to the grid confirm that no repeated information exists, the main control module sends an online battery quantity setting instruction to the energy storage battery module to be connected to the grid;
s5, after receiving the command of setting the number of the online batteries, the energy storage battery module to be connected to the grid replies address information of the energy storage battery module to be connected to the grid;
and S6, after receiving the address information, the main control module sends a voltage regulating instruction to the energy storage battery module to be connected to the grid, and the grid connection of the energy storage battery module to be connected to the grid is completed.
Optionally, the grid connection request instruction in step S1 includes an address, a serial number, a model number, a rated capacity, a voltage output adjustable range, a current output adjustable range, a remaining capacity state, a grid connection state, and position information of the energy storage battery module to be connected to the grid, so that the energy storage battery grid connection system can obtain information of the energy storage battery module to be connected to the grid and determine whether a grid connection condition is met.
Optionally, the grid-connected state includes a to-be-connected grid, a grid-connected success, a grid-connected failure, an alarm or protection, a failure and a normal operation, so as to make a corresponding processing mode for the to-be-connected grid according to different grid-connected states of the to-be-connected grid energy storage battery module, in step S1, the state of the to-be-connected grid energy storage battery module should be displayed as the to-be-connected grid state, and the states of the grid-connected grid success and the grid-connected grid failure are recorded only after the first grid-connected action is completed, and a reply is made when the grid-connected grid state is inquired by the next grid-connected grid or main control module, and if the states of the alarm or the protection, the failure and the like occur, it is indicated that the to-be-connected grid energy storage battery module cannot be connected, and the main control module directly gives up the grid-connected action.
Optionally, the grid connection requirement in step S2 includes: the type of the energy storage battery module to be connected to the grid can be incorporated into a battery list, the standby power duration of the energy storage battery module to be connected to the grid is greater than or equal to the minimum standby power duration threshold of the battery to be incorporated into the grid, the voltage output adjustable range of the energy storage battery module to be connected to the grid meets the requirement, the current output adjustable range of the energy storage battery module to be connected to the grid meets the requirement, and the grid connection action can be carried out only if the conditions are met.
Optionally, the energy storage battery module to be connected to the grid comprises a battery, a DC-DC boosting module, an output switch control module, an MCU control module and a communication module;
the battery is connected with the DC-DC boosting module and the output switch control module, and the DC-DC boosting module, the output switch control module and the communication module are connected with the MCU control module;
the communication module is connected with an energy storage battery grid-connected system;
the DC-DC boosting module is connected with a positive terminal and a negative terminal of the energy storage battery grid-connected system;
the output switch control module is connected with a positive terminal and a negative terminal of the energy storage battery grid-connected system; the energy storage battery to be connected to the grid is connected to the energy storage battery grid-connected system through the communication module, the DC-DC boosting module adjusts the output voltage and the output current of the energy storage battery module to be connected to the grid according to the instruction sent by the main control module, and the output voltage of the DC-DC boosting module is adjusted to be close to or consistent with the output voltage of the energy storage battery grid-connected system.
Optionally, the step S6 specifically includes the following steps:
the main control module sends a voltage regulating instruction to the energy storage battery module to be connected to the grid after receiving the address information of the main control module, the energy storage battery module to be connected to the grid adjusts output voltage and output current through the DC-DC boosting module, and when the difference value between the output voltage of the energy storage battery module to be connected to the grid and the output voltage of the energy storage battery grid-connected system is smaller than a set error threshold value, the output switch control module is switched on, and grid connection of the energy storage battery module to be connected to the grid is completed.
Optionally, the DC-DC boost module includes a DC-DC boost circuit;
the DC-DC booster circuit comprises a first switch unit, a second switch unit, a third switch unit and an inductance unit;
the first switch unit is connected with the inductance unit, the inductance unit is connected with the second switch unit and the third switch unit, the second switch unit is connected with the third switch unit, a battery signal enters the DC-DC booster circuit, the MCU control module controls the on-off of the first switch unit, and in a discharging state, the battery signal is boosted through the inductance unit, at the moment, the second switch unit is used as a follow current tube, and the third switch unit is used as a switch tube; and the energy storage battery module to be connected to the grid adjusts the output voltage to be close to or consistent with the output voltage of the energy storage battery grid-connected system through the DC-DC booster circuit.
Optionally, the DC-DC boost module further includes a filtering unit;
the filtering unit is connected with the DC-DC booster circuit, interference is filtered through the filtering unit, and stability of signal transmission is improved.
Optionally, the DC-DC boost module further includes a current sampling circuit and an overcurrent protection circuit;
the current sampling circuit is connected with the DC-DC booster circuit and the overcurrent protection circuit, obtains a current signal of the main loop through the current sampling circuit, achieves the purpose of current limiting output through the overcurrent protection circuit, and plays a role in protecting the circuit.
Optionally, the communication module adopts a CAN communication mode or an RS485 communication mode, so that system communication is more stable and reliable.
Compared with the prior art, the invention has the beneficial effects that: according to the energy storage battery grid-connected method provided by the invention, when the energy storage battery module to be grid-connected is connected, the energy storage battery grid-connected system does not need to be powered off to stop working, and meanwhile, a pre-charging circuit is not needed to be built by a pre-charging resistor, so that the working efficiency of the energy storage battery grid-connected system is effectively improved, and the method has the advantage of convenience in operation.
Drawings
Fig. 1 is a block diagram of an energy storage battery grid-connected system provided in an embodiment of the present invention.
Fig. 2 is a flowchart of an energy storage battery grid connection method provided in an embodiment of the present invention.
Fig. 3 is a topology structural diagram of an energy storage battery module to be grid-connected according to an embodiment of the present invention.
Fig. 4 is a schematic connection diagram of the DC-DC boost circuit, the current sampling circuit and the filtering unit provided in the embodiment of the present invention.
Fig. 5 is a schematic connection diagram of the first switch unit provided in the embodiment of the present invention.
Fig. 6 is a schematic connection diagram of a second switch unit provided in the embodiment of the present invention.
Fig. 7 is a connection diagram of a third switching unit according to an embodiment of the present invention.
Fig. 8 is a schematic connection diagram of an inductance unit provided in an embodiment of the present invention.
Fig. 9 is a schematic connection diagram of a filtering unit provided in an embodiment of the present invention.
Fig. 10 is a connection schematic diagram of a current sampling circuit provided in an embodiment of the present invention.
Fig. 11 is a connection schematic diagram of an overcurrent protection circuit provided in an embodiment of the present invention.
Fig. 12 is a schematic diagram of a CAN communication circuit provided in the embodiment of the present invention.
Fig. 13 is a schematic diagram of an RS485 communication circuit provided in an embodiment of the present invention.
Fig. 14 is a schematic diagram of an output switch control module provided in an embodiment of the present invention.
Wherein, 1 is a main control module; and 2, an online energy storage battery module.
Detailed Description
In order to explain the technical solution of the present invention in detail, the technical solution of the embodiment of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiment of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention without inventive step, are within the scope of protection of the invention.
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 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.
For example, an energy storage battery grid-connection method is used for connecting an energy storage battery module to be grid-connected into an energy storage battery grid-connection system, wherein the energy storage battery grid-connection system comprises a main control module and a plurality of online energy storage battery modules; the grid connection method comprises the following steps: s1, the energy storage battery module to be connected to the grid sends a grid connection request instruction to a main control module; s2, the master control module receives a grid-connected request instruction sent by the energy storage battery module to be connected to the grid, judges whether the energy storage battery module to be connected to the grid meets the grid-connected requirement or not, and returns a grid-connected allowing instruction or a grid-connected disallowing instruction; s3, after the main control module sends a grid connection permission instruction to the energy storage battery modules to be connected to the grid, sending a query instruction to the plurality of online energy storage battery modules; s4, after the plurality of online energy storage battery modules return query instructions to the main control module and the energy storage battery module to be connected to the grid confirm that no repeated information exists, the main control module sends an online battery quantity setting instruction to the energy storage battery module to be connected to the grid; s5, after receiving the command for setting the number of the online batteries, the energy storage battery module to be connected to the grid replies address information of the energy storage battery module to be connected to the grid; and S6, after receiving the address information, the main control module sends a voltage regulating instruction to the energy storage battery module to be connected to the grid, and the grid connection of the energy storage battery module to be connected to the grid is completed.
According to the energy storage battery grid-connected method provided by the embodiment, when the energy storage battery module to be grid-connected is connected, the energy storage battery grid-connected system does not need to be powered off to stop working, meanwhile, a pre-charging circuit does not need to be built by a pre-charging resistor, the working efficiency of the energy storage battery grid-connected system is effectively improved, and the method has the advantage of convenience in operation.
As shown in fig. 1 and 2, an energy storage battery grid connection method is used for connecting an energy storage battery module to be grid-connected to an energy storage battery grid connection system, and the energy storage battery module to be grid-connected to the system can be connected to the system under the condition that the energy storage battery grid connection system normally operates, and the energy storage battery module to be grid-connected is not required to be connected to the system after the system is powered off. The energy storage battery grid-connected system comprises a main control module and a plurality of online energy storage battery modules.
The grid connection method comprises the following steps:
s1, the energy storage battery module to be connected to the grid sends a grid connection request instruction to a main control module.
Firstly, inserting an energy storage battery module to be connected to the grid into a battery cabinet to complete connection with a port of an energy storage battery grid-connected system, starting a power supply of the energy storage battery module to be connected to the grid after the connection is completed, and sending a grid-connected request instruction to a main control module by the energy storage battery module to be connected to the grid after the energy storage battery module to be connected to the grid is powered on.
The grid-connected request instruction comprises an address, a serial number, a model, a rated capacity, a voltage output adjustable range, a current output adjustable range, a residual capacity state, a grid-connected state and position information of the energy storage battery module to be connected to the grid, so that the energy storage battery grid-connected system can obtain the information of the energy storage battery module to be connected to the grid and judge whether grid-connected conditions are met.
The grid-connected state comprises a to-be-connected grid, grid-connected success, grid-connected failure, alarm or protection, failure and normal operation, so that corresponding processing modes can be conveniently carried out according to different grid-connected states of the to-be-connected grid energy storage battery module.
In one example, the instruction format of the grid connection request instruction is as follows:
a main command CMD1: grid-connected command + slave command CMD2: the method comprises the steps of grid connection request instruction, address of an energy storage battery module to be connected to the grid, serial number, model, rated capacity, voltage output adjustable range, current output adjustable range, residual capacity state, grid connection state and position information.
The position information of the energy storage battery module to be connected to the grid is determined according to project conditions and can be dial switch addresses, box position information in a battery cabinet and the like.
Regarding the address of the energy storage battery module to be connected to the grid, in the grid connection request instruction, the address of the energy storage battery module to be connected to the grid is fixed to be 0, and 0 represents broadcasting.
And S2, the main control module receives a grid connection request instruction sent by the energy storage battery module to be connected to the grid, judges whether the energy storage battery module to be connected to the grid meets the grid connection requirement, and returns a grid connection allowing instruction or a grid connection disallowing instruction.
In one example, the command format for the grid tie command is:
a main command CMD1: grid-connection command + slave command CMD2: and a grid connection reply instruction + the address of the energy storage battery module to be connected to the grid + reply information.
In the allowable grid connection command, the address of the energy storage battery module to be connected to the grid is fixed to be 0, and 0 represents broadcast; and replying the information as agreement on grid connection or disagreement on grid connection.
Wherein, the grid connection requirement includes: the type of the energy storage battery module to be connected to the grid can be incorporated into a battery list, the standby power duration of the energy storage battery module to be connected to the grid is greater than or equal to the minimum standby power duration threshold of the battery to be incorporated into the grid set by the energy storage battery grid connection system, the voltage output adjustable range of the energy storage battery module to be connected to the grid meets the requirement, and the current output adjustable range of the energy storage battery module to be connected to the grid meets the requirement.
And regarding to judging whether the energy storage battery module to be connected to the grid meets the grid-connection requirement, the energy storage battery module to be connected to the grid needs to meet the conditions.
For the condition that the standby power duration of the energy storage battery module to be connected to the grid is greater than or equal to the minimum incorporated battery standby power duration threshold set by the energy storage battery grid-connected system, the calculation mode of the standby power duration of the energy storage battery module to be connected to the grid specifically comprises the following steps: the output current of the energy storage battery modules to be connected to the grid is equal to the rated output current of the energy storage battery grid-connected system divided by the number of the online energy storage battery modules, wherein the number of the online energy storage battery modules comprises the number of the energy storage battery modules to be connected to the grid;
the standby power duration of the energy storage battery module to be connected to the grid is equal to the current residual capacity multiplied by the SOH battery health degree multiplied by the loss coefficient of the energy storage battery grid-connected system, and then divided by the current output by the energy storage battery module to be connected to the grid;
and if the calculated standby power duration of the energy storage battery module to be connected to the grid is greater than or equal to the minimum incorporated battery standby power duration threshold set by the energy storage battery grid-connected system, the condition meets the requirement.
And S3, after sending a grid connection permission instruction to the energy storage battery modules to be connected to the grid, the main control module sends a query instruction to the plurality of online energy storage battery modules.
In one example, the instruction format of the query instruction is:
a main command CMD1: grid-connection command + slave command CMD2: query command + battery address.
In the polling command, the battery address is fixed to 0, and 0 represents a broadcast.
And S4, after the plurality of online energy storage battery modules return the query instruction to the main control module and the energy storage battery module to be connected to the grid confirm that no repeated information exists, the main control module sends an online battery quantity setting instruction to the energy storage battery module to be connected to the grid.
In one example, the instruction format of the query instruction returned by the plurality of online energy storage battery modules to the main control module is as follows:
a main command CMD1: grid-connected command + slave command CMD2: and inquiring information such as the command + the address, the serial number, the battery position information and the like of the battery.
The instruction format for the main control module to send the instruction for setting the online battery number is as follows:
a main command CMD1: grid-connected command + slave command CMD2: and setting an online battery number instruction, an address of the energy storage battery module to be connected to the grid and the online battery number.
Number of online batteries: before the energy storage battery modules to be connected to the grid are connected to the grid, the number of the online energy storage battery modules in the energy storage battery grid-connected system is assumed to be 6, the number of the energy storage battery modules to be connected to the grid is assumed to be 2, and therefore the number of the online batteries is 8.
The address of the to-be-grid-connected energy storage battery module can be determined to be 7 or 8, wherein the to-be-grid-connected energy storage battery module with a smaller serial number defaults to 7, and the to-be-grid-connected energy storage battery module with a larger serial number defaults to 8.
Address of the energy storage battery module to be connected to the grid: in the command, the address of the energy storage battery module to be connected to the grid is fixed to be 0, and 0 represents broadcasting.
And S5, after the energy storage battery module to be connected to the grid receives the command for setting the number of the online batteries, replying the address information of the energy storage battery module to be connected to the grid.
In one example, the instruction format for replying to the self address information is:
a main command CMD1: grid-connected command + slave command CMD2: and the online battery number command replies a command + the local battery address + the serial number.
The address of the battery is as follows: the address should be 7 or 8, and the energy storage battery modules to be connected to the grid respectively send the instruction.
And S6, after receiving the address information, the main control module sends a voltage regulating instruction to the energy storage battery module to be connected to the grid, and the grid connection of the energy storage battery module to be connected to the grid is completed.
In one example, the instruction format for the master control module to send the voltage regulation instruction to the energy storage battery module to be connected to the grid is as follows:
a command CMD1: grid-connected command + slave command CMD2: the voltage regulating instruction, the address of the energy storage battery module to be connected to the grid, the voltage range required to be output and the maximum output current range.
Address of the energy storage battery module to be connected to the grid: in the command, the address of the energy storage battery module to be connected to the grid is fixed to be 0, and 0 represents broadcasting.
And after the grid-connected energy storage battery module receives the voltage regulating instruction, regulating the output voltage and the output current of the grid-connected energy storage battery module, and regulating the output voltage of the grid-connected energy storage battery module to be close to or consistent with the output voltage of the energy storage battery grid-connected system.
In some embodiments, as shown in fig. 3, the energy storage battery module to be grid-connected includes a battery, a DC-DC boost module, an output switch control module, an MCU control module, and a communication module.
The battery is used for providing voltage for the energy storage battery grid-connected system; the DC-DC boosting module is used for adjusting the output voltage to be close to or consistent with the output voltage of the energy storage battery grid-connected system; when the output voltage of the energy storage battery module to be connected to the grid is close to or consistent with the output voltage of the energy storage battery grid-connected system, the output switch control module is conducted, the main loop of the energy storage battery module to be connected to the grid and the energy storage battery grid-connected system is successfully connected to the grid, and the energy storage battery module to be connected to the grid can output power to the energy storage battery grid-connected system; the MCU control module is used for acquiring a signal of the DC-DC boosting module, controlling the DC-DC boosting module to make corresponding adjustment or further action, and transmitting the signal with the communication module; and the communication module is used for communicating with the energy storage battery grid-connected system.
The battery is connected with the DC-DC boosting module and the output switch control module, and the DC-DC boosting module, the output switch control module and the communication module are connected with the MCU control module; the communication module is connected with an energy storage battery grid-connected system; the DC-DC boosting module is connected with a positive terminal and a negative terminal of the energy storage battery grid-connected system; the output switch control module is connected with the positive terminal and the negative terminal of the energy storage battery grid-connected system.
The energy storage battery to be connected to the grid is connected to the energy storage battery grid-connected system through the communication module, the DC-DC boosting module adjusts the output voltage and the output current of the energy storage battery module to be connected to the grid according to the instruction sent by the main control module, and the output voltage of the DC-DC boosting module is adjusted to be close to or consistent with the output voltage of the energy storage battery grid-connected system.
In some embodiments, in step S6, after receiving the address information, the main control module sends a voltage regulating instruction to the energy storage battery module to be grid-connected, so as to complete grid connection of the energy storage battery module to be grid-connected, which specifically includes the following processes:
the main control module sends a voltage regulating instruction to the energy storage battery module to be connected to the grid after receiving the address information of the main control module, the energy storage battery module to be connected to the grid adjusts output voltage and output current through the DC-DC boosting module, and when the difference value between the output voltage of the energy storage battery module to be connected to the grid and the output voltage of the energy storage battery grid-connected system is smaller than a set error threshold value, the output switch control module is switched on, and grid connection of the energy storage battery module to be connected to the grid is completed.
Specifically, as shown in fig. 4-8, the DC-DC boost module includes a DC-DC boost circuit; the DC-DC boost circuit includes a first switching unit, a second switching unit, a third switching unit, and an inductance unit.
The first switch unit is connected with the inductance unit, the inductance unit is connected with the second switch unit and the third switch unit, the second switch unit is connected with the third switch unit, a battery signal enters the DC-DC booster circuit, the MCU control module controls the on-off of the first switch unit, and in a discharging state, the battery signal is boosted through the inductance unit, and at the moment, the second switch unit is used as a follow current tube, and the third switch unit is used as a switch tube; and the energy storage battery module to be connected to the grid adjusts the output voltage to be close to or consistent with the output voltage of the energy storage battery grid-connected system through the DC-DC booster circuit.
As shown in fig. 5 to 7, the first switching unit includes MOS transistors Q1, Q3, Q13, and Q14; the second switch unit comprises MOS tubes Q2, Q5, Q6 and Q10; the third switching unit comprises MOS tubes Q4, Q11, Q8 and Q12.
The BAT _ IN + signal enters the DC-DC booster circuit, the DRV _ Q1+ and the DRV _ Q1-control MOS tubes Q1, Q3, Q13 and Q14 to be used as electronic switches to be switched on and off, IN a discharging state, the voltage is boosted through the inductance unit, the MOS tubes Q2, Q5, Q6 and Q10 are used as follow current tubes, the MOS tubes Q4, Q11, Q8 and Q12 are used as switching tubes, and the signal is output from the BUS +. The DC-DC booster circuit adopts a staggered parallel half-bridge circuit mode, and can reduce the influence of ripples on output.
It should be noted that, in the first switching unit, the second switching unit and the third switching unit, the use of the MOS transistor is not limited, and the controllable switch can be applied to the DC-DC boost circuit.
In some embodiments, as shown in fig. 4 and 9, the DC-DC boost module further includes a filtering unit; the filtering unit is connected with the DC-DC booster circuit, interference is filtered through the filtering unit, and stability of signal transmission is improved.
The filtering unit comprises a capacitor C53 and a capacitor C62 which are connected IN series, and BAT _ IN + signals enter the DC-DC booster circuit after being filtered by the filtering unit, so that the stability of signal transmission is improved.
In some embodiments, as shown in fig. 10 and 11, the DC-DC boost module further includes a current sampling circuit and an overcurrent protection circuit; the current sampling circuit is connected with the DC-DC booster circuit and the overcurrent protection circuit, a current signal of the main loop is obtained through the current sampling circuit, the purpose of current limiting output is achieved through the overcurrent protection circuit, and the current sampling circuit plays a role in protecting the circuit.
The overcurrent protection circuit detects the discharge current and is correspondingly controlled by the MCU control module.
Referring to fig. 10, the current sampling circuit includes resistors R58, R59, R61, R62, R64, and R67 connected in parallel, and performs current sampling by the current sampling circuit, and a sampled current signal passes through the overcurrent protection circuit to detect a discharge current.
The discharge current detection unit comprises an operational amplifier and a comparator; the operational amplifier U12B is connected with the current sampling circuit and the comparator U13B, and the comparator U13B is connected with the MCU control module.
The sampled discharge current is amplified by the operational amplifier U12B, enters the comparator U13B, is detected, and if the discharge current exceeds a limit value, a high level is output to a TZ port of the MCU control module to trigger wave-by-wave current limiting, and the MCU control module seals the drive of the second switch unit and the third switch unit, so that the purpose of hardware current limiting is achieved.
It should be noted that, in this example, an overcurrent protection function with one hardware stage and two software stages may be set, and when the MCU control module closes the driving of the second switch unit and the third switch unit, the purpose of hardware current limiting is achieved, the software performs average filtering on the current, and performs discharge current limiting through the software current loop, so as to achieve the purpose of constant current discharge. The hardware current-limiting speed is high, the hardware current-limiting speed is used for rapid overcurrent fault protection, the software current-limiting speed is slightly low, but the software current-limiting speed is more accurate, the purpose of current-limiting output can be achieved, and the software and hardware current-limiting functions are combined to achieve more perfect protection on the circuit.
In some embodiments, the communication module uses a CAN communication mode or an RS485 communication mode, so that system communication is more stable and reliable, as shown in fig. 12 and 13, fig. 12 shows a CAN communication circuit, and fig. 13 shows an RS485 communication circuit.
Referring to fig. 12, the network labels CANTX and CANRX respectively correspond to the peripheral CANs of the MCU control module, which are output through the isolation device and connected to the transceiver IC in the CAN communication circuit, and convert the isolated CAN signals into a standard CAN bus physical layer interface.
The TVS or ESD device CAN be connected to the output interface of the CAN communication circuit, and the internal device is prevented from being damaged by external static high voltage.
Referring to fig. 13, network labels 485 \urx _2and 485_tx _, 2 are respectively connected to serial port communication RX and TX pins of the MCU control module, serial port communication data transmitted by the MCU control module is output to the U25 opto-isolator IC through the TX pin and then output to the RE and DE pins of the U12, enabling the transmission mode of the U12, and the U12 converts data transmitted by the MCU control module into an RS485 differential level with isolation. When the MCU control module receives the signal, 485 \uTX _2is at a high level, and is changed into a low level after being optically coupled by a U25 to be output to RE and DE pins of U12, and the U12 is in a receiving mode. The external RS485 differential signal is converted into a serial port signal through the U12 and is output to the U16, and the serial port signal is output to a 485 \uRx \u2 pin after being isolated. The MCU control module receives data sent from the outside. ZD45 and ZD42 are electrostatic protection devices, and have the function of resisting electrostatic stress and protecting circuits.
As shown in fig. 14, which is a schematic diagram of an output switch control module, the output switch control module includes a plurality of charging MOS transistors connected in parallel and then connected in series with a plurality of discharging MOS transistors connected in parallel to form a switch loop, two signals in the loop respectively correspond to a discharging control signal DSG and a charging control signal CHG, and after the grid connection is completed, the MCU control module of the energy storage battery module to be connected to the grid outputs a DSG high level and also outputs a CHG high level, so that the two charging and discharging MOS transistors are turned on, and the whole main loop is turned on.
According to the energy storage battery grid-connected method provided by the invention, when the energy storage battery module to be grid-connected is connected, the energy storage battery grid-connected system does not need to be powered off to stop working, and meanwhile, a pre-charging circuit does not need to be built by a pre-charging resistor, so that the working efficiency of the energy storage battery grid-connected system is effectively improved, and the method has the advantage of convenience in operation.
It is understood that different embodiments among the components in the above embodiments can be combined and implemented, and the embodiments are only for illustrating the implementation of specific structures and are not limited to the implementation of the embodiments.
The embodiments of the present invention have been described in detail with reference to the drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention.
Claims (10)
1. The energy storage battery grid-connection method is characterized by being used for connecting an energy storage battery module to be grid-connected into an energy storage battery grid-connection system, wherein the energy storage battery grid-connection system comprises a main control module and a plurality of online energy storage battery modules;
the grid connection method comprises the following steps:
s1, the energy storage battery module to be connected to the grid sends a grid connection request instruction to a main control module;
s2, the master control module receives a grid-connected request instruction sent by the energy storage battery module to be connected to the grid, judges whether the energy storage battery module to be connected to the grid meets the grid-connected requirement or not, and returns a grid-connected allowing instruction or a grid-connected disallowing instruction;
s3, after sending a grid-connection allowing instruction to the energy storage battery module to be connected to the grid, the main control module sends a query instruction to the plurality of online energy storage battery modules;
s4, after the plurality of online energy storage battery modules return query instructions to the main control module and the energy storage battery module to be connected to the grid confirm that no repeated information exists, the main control module sends an online battery quantity setting instruction to the energy storage battery module to be connected to the grid;
s5, after receiving the command of setting the number of the online batteries, the energy storage battery module to be connected to the grid replies address information of the energy storage battery module to be connected to the grid;
and S6, after receiving the address information, the main control module sends a voltage regulating instruction to the energy storage battery module to be connected to the grid, and the grid connection of the energy storage battery module to be connected to the grid is completed.
2. The energy storage battery grid connection method according to claim 1, wherein the grid connection request instruction in the step S1 includes an address, a serial number, a model number, a rated capacity, a voltage output adjustable range, a current output adjustable range, a residual capacity state, a grid connection state and position information of the energy storage battery module to be grid connected.
3. The energy storage battery grid connection method according to claim 2, wherein the grid connection state comprises grid connection waiting, grid connection success, grid connection failure, alarm or protection, failure and normal operation.
4. The energy storage battery grid connection method according to claim 1, wherein the grid connection requirement in the step S2 includes: the type of the energy storage battery module to be connected to the grid can be incorporated into a battery list, the standby power duration of the energy storage battery module to be connected to the grid is greater than or equal to the minimum standby power duration threshold of the battery to be incorporated into the grid set by the energy storage battery grid connection system, the voltage output adjustable range of the energy storage battery module to be connected to the grid meets the requirement, and the current output adjustable range of the energy storage battery module to be connected to the grid meets the requirement.
5. The energy storage battery grid connection method according to claim 1, wherein the energy storage battery module to be grid connected comprises a battery, a DC-DC boosting module, an output switch control module, an MCU control module and a communication module;
the battery is connected with the DC-DC boosting module and the output switch control module, and the DC-DC boosting module, the output switch control module and the communication module are connected with the MCU control module;
the communication module is connected with an energy storage battery grid-connected system;
the DC-DC boosting module is connected with a positive terminal and a negative terminal of the energy storage battery grid-connected system;
the output switch control module is connected with the positive terminal and the negative terminal of the energy storage battery grid-connected system.
6. The energy storage battery grid connection method according to claim 5, wherein the step S6 specifically comprises the following steps:
the main control module sends a voltage regulating instruction to the energy storage battery module to be connected to the grid after receiving the address information of the main control module, the energy storage battery module to be connected to the grid adjusts output voltage and output current through the DC-DC boosting module, and when the difference value between the output voltage of the energy storage battery module to be connected to the grid and the output voltage of the energy storage battery grid-connected system is smaller than a set error threshold value, the output switch control module is switched on, and grid connection of the energy storage battery module to be connected to the grid is completed.
7. The energy storage battery grid connection method according to claim 5, wherein the DC-DC boost module comprises a DC-DC boost circuit;
the DC-DC booster circuit comprises a first switch unit, a second switch unit, a third switch unit and an inductance unit;
the first switch unit is connected with the inductance unit, the inductance unit is connected with the second switch unit and the third switch unit, and the second switch unit is connected with the third switch unit.
8. The energy storage battery grid connection method according to claim 7, wherein the DC-DC boosting module further comprises a filtering unit;
the filtering unit is connected with the DC-DC booster circuit.
9. The energy storage battery grid connection method according to claim 7, wherein the DC-DC boost module further comprises a current sampling circuit and an overcurrent protection circuit;
the current sampling circuit is connected with the DC-DC booster circuit and the overcurrent protection circuit.
10. The energy storage battery grid connection method according to claim 5, wherein the communication module adopts a CAN communication mode or an RS485 communication mode.
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