CN113659668B - Electrochemical energy storage power station battery discharge loop, control system and control method - Google Patents
Electrochemical energy storage power station battery discharge loop, control system and control method Download PDFInfo
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- CN113659668B CN113659668B CN202110921185.XA CN202110921185A CN113659668B CN 113659668 B CN113659668 B CN 113659668B CN 202110921185 A CN202110921185 A CN 202110921185A CN 113659668 B CN113659668 B CN 113659668B
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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
- H02J7/0063—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with circuits adapted for supplying loads from the battery
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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
- H01M10/44—Methods for charging or discharging
- H01M10/441—Methods for charging or discharging 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
- H02J7/0042—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by the mechanical construction
- H02J7/0045—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by the mechanical construction concerning the insertion or the connection of the batteries
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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
- H02J7/0048—Detection of remaining charge capacity or state of charge [SOC]
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
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- 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
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Secondary Cells (AREA)
Abstract
The application discloses electrochemistry energy storage power station battery discharge circuit in electrochemistry energy storage power station battery discharge circuit, when a plurality of storage battery are in the discharge nuclear capacity state, first switch unit inserts nuclear capacity device into the discharge busbar for nuclear capacity device is connected with the discharge busbar, the rethread is in the second switch unit that the storage battery corresponds of discharge nuclear capacity state, access the discharge busbar with the discharge end of a plurality of storage battery in discharge nuclear capacity state, make a plurality of storage battery in discharge nuclear capacity state can pass through the second switch unit, make discharge current flow in the discharge busbar, thereby utilize nuclear capacity device to check and flow through the discharge busbar and obtain the electric current to carry out nuclear capacity to storage battery. Further, when a plurality of storage battery packs are in a charging state, charging ends of the storage battery packs in the discharging capacity state are connected into a charging bus through third switch units corresponding to the storage battery packs in the discharging capacity state, so that charging of the storage battery packs is achieved.
Description
Technical Field
The application relates to the field of power supply testing, in particular to a battery discharging loop, a control system and a control method of an electrochemical energy storage power station.
Background
With the continuous development of economy, the electricity consumption of people is continuously increased, and in order to ensure the power supply of each region, corresponding transformer substations or other key power grid nodes are usually built in each region. However, when the power supply line of the key grid node is damaged in the face of a disaster such as typhoons, ice and snow weather, floods and the like, the power supply of the region is interrupted.
In order to avoid the occurrence of power interruption caused by disasters, an electrochemical battery energy storage power station with a disaster resistance level is configured at a key power grid node. Because the battery capacity of the electrochemical battery energy storage power station can be lost along with the increase of the using times, the battery capacity of the electrochemical battery energy storage power station needs to be checked regularly so as to ensure that the residual battery capacity can meet the disaster-resistant requirement. The process of checking the capacity of the battery is to discharge the battery to obtain relevant capacity data, so how to design a battery discharge circuit of the electrochemical energy storage power station to control the discharge of the battery to realize the capacity check is a constant concern.
Disclosure of Invention
In view of the above, the present application provides a battery discharging circuit, a control system and a control method for an electrochemical energy storage power station, so as to control the discharge of the electrochemical energy storage battery, and realize capacity check.
In order to achieve the above object, the following solutions have been proposed:
an electrochemical energy storage power station cell discharge circuit comprising:
the device comprises a nuclear capacity device, a first switch unit, a plurality of storage battery packs, a plurality of second switch units, a plurality of third switch units, a discharging bus, a charging bus and a direct current power supply device;
the nuclear capacity device is connected with the discharging bus through the first switch unit and is used for checking the capacity of the storage battery when the storage battery pack is in a discharging nuclear capacity state;
the second switch unit is used for connecting the storage battery with the discharging bus when the storage battery is in a discharging nuclear capacity state, and the third switch unit is used for connecting the storage battery with the charging bus when the storage battery is in a charging state;
the direct current power supply device is connected with the charging bus and used for charging the storage battery pack when the storage battery pack is in a charging state.
Optionally, the battery pack includes: a DC/DC converter and a battery;
the storage battery is connected with one end of the DC/DC converter, and the other end of the DC/DC converter is respectively connected with one end of the second switch unit and one end of the third switch unit.
Optionally, the method further comprises: a plurality of fourth switching units;
when the storage battery pack is in a discharge nuclear capacity state, the second switch unit is connected with the fourth switch unit in series, and the storage battery pack is assembled into a discharge loop bus; when the storage battery pack is in a charging state, the third switch unit and the fourth switch unit are connected in series, and the storage battery pack is connected into a charging loop bus.
Optionally, the dc power supply device includes: a fifth switching unit, an AC/DC converter, a sixth switching unit, and a transforming device;
one end of the AC/DC converter is connected with the charging bus through the fifth switch unit, and the other end of the AC/DC converter is connected with one end of the voltage transformation device through the sixth switch unit.
Optionally, the first switching unit includes: a circuit breaker and a disconnector;
the circuit breaker is connected with the isolating switch in series, and the nuclear capacity device is connected into the discharging bus.
Optionally, the second switch unit and the third switch unit are isolation switches, and further comprise a locking control module;
when a plurality of storage battery packs exist in the discharging loop and are in a discharging nuclear capacity state, the locking control module is used for locking the switch closing function of a second switch unit corresponding to the storage battery pack which is not in the discharging nuclear capacity state and a third switch unit corresponding to the storage battery pack which is in the discharging nuclear capacity state.
The control system of the battery discharging loop of the electrochemical energy storage power station comprises a controller and the battery discharging loop of the electrochemical energy storage power station;
the controller is used for receiving a discharging/charging instruction of a user and controlling the working state of the discharging loop based on the instruction.
The control method for the discharge loop of the electrochemical energy storage power station battery is used for controlling the discharge loop of the electrochemical energy storage power station battery, and comprises the following steps:
receiving a discharge nuclear capacity instruction, wherein the discharge nuclear capacity instruction comprises information of a storage battery pack for carrying out discharge nuclear capacity;
closing the first switch unit to enable the nuclear capacity device to be connected with the discharging bus;
detecting whether a third switch unit corresponding to a storage battery pack for discharging the nuclear capacity is in an off state or not;
if not, the third switch unit corresponding to the storage battery pack for discharging the nuclear capacity is disconnected;
and closing a second switch unit corresponding to the storage battery pack with the discharge capacity, so that the storage battery pack with the discharge capacity is connected with the discharge bus.
Optionally, the method further comprises:
receiving a discharge stopping nuclear capacity instruction, wherein the discharge stopping nuclear capacity instruction comprises information of a storage battery pack with discharge stopping nuclear capacity;
disconnecting a second switch unit corresponding to the storage battery pack with the stopping discharge capacity, so that the storage battery pack with the stopping discharge capacity is disconnected from the discharge bus;
checking whether the storage battery pack is in a discharge capacity state;
if not, the first switch unit is disconnected, so that the nuclear capacity device is disconnected from the discharging bus.
Optionally, the method further comprises:
receiving a charging instruction, wherein the charging instruction comprises information of a storage battery pack to be charged;
detecting whether a second switch unit corresponding to the storage battery pack to be charged is in an off state or not;
if not, the second switch unit corresponding to the storage battery pack to be charged is disconnected;
and closing a third switch unit corresponding to the storage battery pack to be charged, so that the storage battery pack to be charged is connected with a charging bus.
According to the technical scheme, in the electrochemical energy storage power station battery discharging loop provided by the embodiment of the application, when a plurality of storage battery packs are in a discharging nuclear capacity state, the first switch unit is used for switching the nuclear capacity device into the discharging bus so that the nuclear capacity device is connected with the discharging bus, and then the discharging ends of the storage battery packs in the discharging nuclear capacity state are switched into the discharging bus through the second switch units corresponding to the storage battery packs in the discharging nuclear capacity state, so that the storage battery packs in the discharging nuclear capacity state can flow into the discharging bus through the second switch units, and the nuclear capacity device is used for checking the current flowing through the discharging bus to carry out nuclear capacity on the storage battery packs.
Furthermore, in the battery discharging loop of the electrochemical energy storage power station, when a plurality of storage battery packs are in a charging state, the charging ends of the storage battery packs in the charging state are connected into a charging bus through third switch units corresponding to the storage battery packs in the discharging nuclear capacity state, so that the storage battery packs are charged.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present application, and that other drawings may be obtained according to the provided drawings without inventive effort to a person skilled in the art.
FIG. 1 is a schematic diagram of a discharge circuit of a battery of an electrochemical energy storage power station according to an embodiment of the present disclosure;
FIG. 2 is a schematic diagram of another electrochemical energy storage power station battery discharge circuit configuration according to an embodiment of the present disclosure;
FIG. 3 is a flowchart of a method for controlling a discharge loop of a battery of an electrochemical energy storage power station according to an embodiment of the present application;
FIG. 4 is a flowchart of a method for controlling battery charging in an electrochemical energy storage power station according to an embodiment of the present disclosure;
fig. 5 is a flowchart of another method for controlling a battery discharge loop of an electrochemical energy storage power station according to an embodiment of the present application.
Detailed Description
The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.
Fig. 1 is a schematic structural diagram of a discharge circuit of a battery of an electrochemical energy storage power station according to an embodiment of the present application, where the discharge circuit may include: the nuclear capacity device 10, the first switch unit 20, the plurality of storage battery packs 30, the plurality of second switch units 40, the plurality of third switch units 50, the discharging bus 60, the charging bus 70 and the direct current power supply device 80.
The nuclear reactor 10 is connected to the discharge bus 60 via a first switching unit 20.
Specifically, the capacity checking device 10 is used for checking the capacity of the battery when the battery pack 30 is in the discharge capacity checking state. When the storage battery pack 30 is in a discharge capacity state, the capacity device 10 can be connected to the discharge bus 60 through the first switch unit 20, and a switch in the first switch unit 20 is in a closed state; when there is no battery pack 30 in the discharge capacity state, the capacity device 10 may disconnect the connection with the discharge bus 60 through the first switching unit 20.
The second switching unit 40 switches the battery into the discharge bus 60 when the battery pack 30 is in the discharge capacity state.
Specifically, when the battery pack 30 is in the discharge capacity state, the battery pack 30 may be connected to the discharge bus 60 through the second switch unit 40, and the switch in the second switch unit 40 is in the closed state; when the battery pack 30 is not in the discharge capacity state, the battery may be disconnected from the discharge bus 60 by the second switching unit 40.
The second switching unit 40 may be a circuit breaker, or may be a switching circuit formed by connecting a circuit breaker and a disconnecting switch in series.
The third switching unit 50 connects the battery pack 30 to the charging bus bar 70 when the battery pack 30 is in a charged state.
Specifically, when the battery pack 30 is in a charging state, the battery pack 30 may be connected to the charging bus 70 through the third switch unit 50, and the switch in the third switch unit 50 is in a closed state; when the battery pack 30 is not in a charged state, the battery may be disconnected from the charging bus bar 70 by the third switching unit 50.
The third switching unit 50 may be a circuit breaker, or may be a switching circuit formed by connecting a circuit breaker and a disconnecting switch in series.
The dc power supply device is connected to the charging bus 70.
Specifically, the dc power supply device may convert the ac power into the dc power and transmit the dc power to the charging bus 70, and when the battery pack 30 needs to be charged, the charging bus 70 may be accessed through the corresponding third switch unit 50, so as to complete charging.
As can be seen from the above technical solution, in the electrochemical energy storage power station battery discharging circuit provided in the embodiments of the present application, when a plurality of storage battery packs 30 are in a discharging core capacity state in the electrochemical energy storage power station battery discharging circuit, the first switch unit 20 connects the core capacity device 10 to the discharging bus 60, so that the core capacity device 10 is connected with the discharging bus 60, and then the discharging ends of the plurality of storage battery packs 30 in the discharging core capacity state are connected to the discharging bus 60 through the second switch units 40 corresponding to the plurality of storage battery packs 30 in the discharging core capacity state, so that a plurality of storage battery packs 30 in the discharging core capacity state can flow into the discharging bus 60 through the second switch units 40, and thus the core capacity device 10 is utilized to check the current flowing through the discharging bus 60 to perform core capacity on the storage battery packs 30.
Further, in the electrochemical energy storage power station battery discharging circuit, when a plurality of storage battery packs 30 are in a charging state, charging of the storage battery packs 30 is achieved by connecting charging ends of the storage battery packs 30 in the charging state to the charging bus 70 through the third switch units 50 corresponding to the storage battery packs 30 in the discharging capacity state.
In some embodiments of the present application, another electrochemical energy storage power station cell discharge loop is provided, and in conjunction with the illustration of fig. 2, the second switching unit 40 of the electrochemical energy storage power station cell discharge loop may comprise: a circuit breaker K10 and a disconnector K11.
Specifically, the circuit breaker K1 is connected in series with the disconnecting switch K2, and after the circuit breaker K1 is connected in series with the disconnecting switch K2, the connection relationship between the other end of the circuit breaker K1 and the other end of the disconnecting switch K2 and the nuclear capacity device 10 and the discharge bus 60 may be that the other end of the circuit breaker K1 is connected with the nuclear capacity device 10, and the other end of the disconnecting switch K2 is connected with the discharge bus 60; the other end of the breaker K1 may be connected to the discharge bus 60, and the other end of the disconnecting switch K2 may be connected to the nuclear reactor 10.
The circuit breaker is a switching device capable of closing, carrying and breaking a current under normal circuit conditions and capable of closing, carrying and breaking a current under abnormal circuit conditions for a predetermined time. The disconnector can be used as a significant disconnection point during maintenance, and the disconnector is not allowed to be closed or opened under load.
In addition, the second switching element 40 of the electrochemical energy storage power station cell discharge loop may comprise only: a circuit breaker. One end of the circuit breaker is connected to the nuclear containment device 10, and the other end is connected to the discharge bus 60.
Further, in order to ensure the safety in the discharging capacity process, misoperation of the isolating switch is avoided. In some embodiments of the present application, the electrochemical energy storage power station cell discharge loop may further comprise: the locking control module can be used for locking the switch closing function of the second switch unit corresponding to the storage battery pack which is not in the discharge capacity state when the second switch unit is an isolating switch; and when the third switch unit is an isolating switch, locking the switch closing function of the third switch unit corresponding to the storage battery pack in the discharge capacity state.
Further, in the discharging circuit in the embodiment of the present application, when the isolating switches are provided in the respective switch units, the isolating switches cannot be turned on and off in the electrified state.
As shown in connection with fig. 2, several battery packs 30 of electrochemical energy storage power station cell discharge circuits may include: a DC/DC converter 301 and a battery 302.
Wherein, the battery 302 is connected to one end of the DC/DC converter 301, and the other end of the DC/DC converter 301 is connected to one end of the second switching unit 40 and one end of the third switching unit 50, respectively.
Specifically, the DC/DC converter 301 is connected to the battery 302, and charging and discharging of the corresponding battery 302 can be controlled by the DC/DC converter 301. When the storage battery 302 is in a discharge capacity state, the second switch unit 40 connects the DC/DC converter 301 to the discharge bus 60, and the DC/DC converter 301 can control the storage battery 302 to start discharging; when the battery 302 is in a charged state, the third switching unit 50 switches the DC/DC converter 301 into the charging bus 70, and the DC/DC converter 301 can control the battery 302 to start charging.
Further, as shown in connection with fig. 2, the dc power supply 80 of the electrochemical energy storage power station battery discharge loop may include: a fifth switching unit 801, an AC/DC converter 802, a sixth switching unit 803, and a transformer 804.
Wherein one end of the AC/DC converter 802 is connected to the charging bus 70 through the fifth switching unit 801, and the other end of the AC/DC converter 802 is connected to one end of the transformer 804 through the sixth switching unit 803.
Specifically, when the storage battery pack 30 is in a charging state, the dc power supply device 80 may be connected to the charging bus 70 through the fifth switch unit 801, and the switch in the fifth switch unit 802 is in a closed state; when there is no battery pack 30 in a charged state, the direct current power supply device 80 may disconnect the connection with the charging bus bar 70 through the fifth switching unit 801. The AC/DC converter 802 in the DC power supply device 80 can convert the AC power supplied from the transformer 804 into DC power required for charging the battery pack 30.
Further, the fifth switching unit may be a circuit breaker, or may be a switching unit formed by connecting a circuit breaker switch and a disconnecting switch in series. The sixth switching unit may be a circuit breaker, or may be a switching unit formed by connecting a circuit breaker switch and a disconnector switch in series.
In some embodiments of the present application, the electrochemical energy storage power station cell discharge loop may further comprise: a number of fourth switching units 90.
When the battery pack 30 is in the discharge capacity state, the second switch unit 40 and the fourth switch unit 90 are connected in series, and the battery pack 30 is connected to the discharge bus 60; when the battery pack 30 is in a charged state, the third switching unit 50 is connected in series with the fourth switching unit 90, and the battery pack 30 is connected to the charging bus 60.
Specifically, the battery pack 30 is connected to one end of the fourth switching unit 90, and the other end of the fourth switching unit 90 is connected to the discharge bus 60 through the second switching unit 40 and to the charge bus 70 through the third switching unit 50. When the battery pack 30 is in the discharge capacity state, the fourth switching unit 90 and the second switching unit 40 are in the on state, and the third switching unit 50 is in the off state, so that the battery pack 30 can be connected to the discharge bus 60, thereby realizing the discharge capacity; when the battery pack 30 is in a charged state, the fourth switching unit 90 and the third switching unit 50 are in a conductive state, and the second switching unit 40 is in a disconnected state, so that the battery pack 30 can be connected to the charging bus 70, thereby charging the battery pack 30.
The fourth switching units 90 may be isolating switches, and in this case, the correspondingly connected second switching units 40 and third switching units 50 may be circuit breakers; the fourth switching units 90 may also be circuit breakers, and the correspondingly connected second switching units 40 and third switching units 50 may be disconnectors.
The embodiment of the application also provides a control system of a battery discharging loop of an electrochemical energy storage power station, which can comprise: the controller and the electrochemical energy storage power station battery discharge loop in the embodiment.
Specifically, the controller may be configured to receive a discharge/charge command from a user and control an operating state of the discharge circuit based on the command. The working state of the discharging circuit may be controlled by controlling the on/off of each switch unit in the discharging circuit, or by controlling the charging and discharging process of the battery pack 30.
The method for controlling the discharge loop of the electrochemical energy storage power station battery provided in the embodiments of the present application is described below in terms of a controller, and the method for controlling the discharge loop of the electrochemical energy storage power station battery described below and the discharge loop of the electrochemical energy storage power station battery described above may be referred to correspondingly.
Referring to fig. 3, fig. 3 is a flowchart of a control method for a discharge loop of a battery of an electrochemical energy storage power station according to an embodiment of the present application, where the method may include the following steps:
step S100, receiving a discharge nuclear capacity instruction.
The discharge capacity command includes information of the battery pack 30 for performing the discharge capacity.
Specifically, by the obtained information of the battery pack 30 having the discharge capacity, the number of the battery pack 30 having the discharge capacity required, and the second switching unit 40 and the third switching unit 50 corresponding to the battery pack having the discharge capacity required can be determined.
Step S101, the first switch unit is closed.
Specifically, when the first switching unit 20 is closed, the nuclear containment device 10 may be connected to the discharge bus 60, so that when a current flows through the discharge bus 60, the flowing current may be checked.
Further, before the first switch unit is closed, if one end of the isolating switch is connected with the discharging bus, the opening and closing states of the isolating switch need to be checked in advance to ensure that the isolating switch connected with the discharging bus is in a split position, and if the isolating switch is not in the split position, the isolating switch needs to be closed after the isolating switch is in the split position, so that the occurrence of error connection is avoided.
Step S102, detecting whether the third switch unit corresponding to the battery pack performing the discharging capacity is in an off state, if not, executing step S103, and if so, executing step S104.
Specifically, before the discharging capacity is performed, whether the third switch unit 50 corresponding to the storage battery pack 30 requiring the discharging capacity is in an open state or not may be detected, so that the third switch unit 50 is still in a closed state when the discharging capacity is performed, and the discharging circuit is prevented from being failed.
Step S103, a third switch unit corresponding to the storage battery pack for discharging the capacity is turned off.
Specifically, the connection between the battery pack 30, which needs to be subjected to the discharge capacity, and the charging circuit can be disconnected by opening the third switching unit 50 corresponding to the battery pack subjected to the discharge capacity.
And step S104, closing a second switch unit corresponding to the storage battery pack for discharging the nuclear capacity.
Specifically, after the first switching unit 20 is closed, the nuclear containment device 10 is connected to the discharge bus 60, and the current flowing through the discharge bus 60 may be checked. At this time, the second switch units 40 corresponding to the battery packs 30 requiring the discharge capacity are closed, and each battery pack 30 requiring the discharge capacity is connected to the discharge bus 60 through the corresponding second switch unit 40 to discharge, thereby realizing the capacity of the battery pack 30.
As can be seen from the above-mentioned technical solution, in the control method for a battery discharging loop of an electrochemical energy storage power station provided in the embodiment of the present application, in the battery discharging loop of the electrochemical energy storage power station, when a plurality of storage battery packs 30 are in a discharging capacity state, the first switch unit is closed, whether the third switch unit 50 corresponding to the storage battery pack 30 with discharging capacity is in an open state is detected, if not, the corresponding third switch unit 50 needs to be opened, and when the third switch unit 50 corresponding to the storage battery pack 30 with discharging capacity is determined to be in an open state, the plurality of storage battery packs 30 with discharging capacity state are connected to the discharging bus 60 through the second switch units 40 corresponding to the plurality of storage battery packs 30 with discharging capacity state, so that a plurality of storage battery packs 30 with discharging capacity state can flow into the discharging bus 60 through the second switch units 40, and thus the storage battery packs 30 with discharging capacity device 10 check to obtain the nuclear capacity of the storage battery packs 30.
In some embodiments of the present application, a control method for implementing battery charging for a battery discharge loop of an electrochemical energy storage power station is presented. Referring to fig. 4, fig. 4 is a flowchart of a method for controlling battery charging of an electrochemical energy storage power station according to an embodiment of the present application, where the method may include the following steps:
step S200, receiving a charging instruction.
The charging command includes information of the battery pack to be charged.
Step S201, detecting whether the second switch unit corresponding to the charged battery pack is in an off state, if not, executing step S202, and if so, executing step S203.
Step S202, the second switch unit corresponding to the charged battery pack is turned off.
Specifically, the second switch unit corresponding to the battery pack charged is turned off, so that the battery pack with the capacity of stopping discharging can be disconnected from the discharging bus.
Step S203, the third switch unit corresponding to the charged battery pack is closed.
Specifically, the battery pack 30 to be charged can be connected to the charging bus bar 70 by closing the corresponding third switching unit 50 of the battery pack 30 to be charged. Since the charging bus 70 is connected to the dc power supply device 80, a dc current flows through the charging bus 70, and the charging of the battery pack can be achieved by the dc current flowing through the charging bus 70.
Referring to fig. 5, fig. 5 is a flowchart of a control method for a discharge loop of a battery of an electrochemical energy storage power station according to an embodiment of the present application, where the method may include the following steps:
step S300, receiving a discharge nuclear capacity instruction.
Step S301, the first switch unit is closed.
Step S302, detecting whether a third switch unit corresponding to the battery pack performing the discharging capacity is in an off state, if not, executing step S103, and if so, executing step S104.
Step S303, the third switch unit corresponding to the storage battery pack for discharging the capacity is turned off.
And S304, closing a second switch unit corresponding to the storage battery pack for discharging the nuclear capacity.
The steps S200-S204 correspond to the steps S100-S104 in the foregoing embodiments, and the detailed description is referred to above, which is not repeated here.
Step S305, receiving a command for stopping discharging the nuclear capacity.
The instruction for stopping discharging the battery pack 30 includes information for stopping discharging the battery pack.
Specifically, the condition for triggering the instruction for stopping discharging the nuclear capacity may be that the voltage of a single storage battery is lower than a limit value, an emergency shutdown button located on the nuclear capacity device 10 is started, the current of a discharging loop is greater than a fixed value, the nuclear capacity is finished, or a fire disaster is detected at a working place.
And step S306, opening a second switch corresponding to the storage battery pack for stopping discharging the nuclear capacity.
Specifically, after receiving the instruction for stopping discharging the capacity, the corresponding second switch unit 40 may be determined by the information of the storage battery pack 30 for stopping discharging the capacity included in the instruction, and by opening the second switch unit 40, the connection between the storage battery pack 30 for stopping discharging the capacity and the discharging bus 60 may be disconnected, thereby ending the discharging capacity.
Step S307, checking whether the storage battery pack is in a discharging capacity state, if not, executing step S308.
Specifically, in the instruction for stopping the discharge capacity received in the above step, the storage battery pack containing the stop discharge capacity does not necessarily contain all the storage battery packs that have been in the discharge capacity state before, so it can be determined whether the discharge capacity in the discharge loop is still in progress by checking whether the storage battery pack is in the discharge capacity state.
Step S308, the first switch unit is turned off.
Specifically, after the first switching unit 20 is turned off, the nuclear containment device 10 may be disconnected from the discharge bus 60.
Finally, it is further noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
In the present specification, each embodiment is described in a progressive manner, and each embodiment focuses on the difference from other embodiments, and each embodiment may be combined with each other, and the same similar parts may be referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. An electrochemical energy storage power station cell discharge circuit comprising:
the device comprises a nuclear capacity device, a first switch unit, a plurality of storage battery packs, a plurality of second switch units, a plurality of third switch units, a discharging bus, a charging bus and a direct current power supply device;
the nuclear capacity device is connected with the discharging bus through the first switch unit and is used for checking the capacity of the storage battery when the storage battery pack is in a discharging nuclear capacity state;
the second switch unit is used for connecting the storage battery with the discharging bus when the storage battery is in a discharging nuclear capacity state, and the third switch unit is used for connecting the storage battery with the charging bus when the storage battery is in a charging state;
the direct current power supply device is connected with the charging bus and is used for charging the storage battery pack when the storage battery pack is in a charging state;
when a plurality of storage battery packs are in a discharge nuclear capacity state, the first switch unit connects the nuclear capacity device to a discharge bus so that the nuclear capacity device is connected with the discharge bus, then the discharge ends of the storage battery packs in the discharge nuclear capacity state are connected to the discharge bus through the second switch units corresponding to the storage battery packs in the discharge nuclear capacity state, so that the storage battery packs in the discharge nuclear capacity state flow into the discharge bus through the second switch units, and the nuclear capacity device is used for checking the current flowing through the discharge bus to carry out nuclear capacity on the storage battery packs;
when a plurality of storage battery packs are in a charging state, the charging ends of the storage battery packs in the discharging capacity state are connected into a charging bus through the third switch units corresponding to the storage battery packs in the discharging capacity state, so that the storage battery packs are charged.
2. The discharge circuit of claim 1, wherein the battery pack comprises: a DC/DC converter and a battery;
the storage battery is connected with one end of the DC/DC converter, and the other end of the DC/DC converter is respectively connected with one end of the second switch unit and one end of the third switch unit.
3. The discharge circuit of claim 1, further comprising: a plurality of fourth switching units;
when the storage battery pack is in a discharge nuclear capacity state, the second switch unit is connected with the fourth switch unit in series, and the storage battery pack is assembled into a discharge loop bus; when the storage battery pack is in a charging state, the third switch unit and the fourth switch unit are connected in series, and the storage battery pack is connected into a charging loop bus.
4. The discharge circuit of claim 1, wherein the dc power supply device comprises: a fifth switching unit, an AC/DC converter, a sixth switching unit, and a transforming device;
one end of the AC/DC converter is connected with the charging bus through the fifth switch unit, and the other end of the AC/DC converter is connected with one end of the voltage transformation device through the sixth switch unit.
5. The discharge circuit of claim 1, wherein the first switching unit comprises: a circuit breaker and a disconnector;
the circuit breaker is connected with the isolating switch in series, and the nuclear capacity device is connected into the discharging bus.
6. The discharge circuit of claim 1, wherein the second and third switching units are isolation switches, further comprising a lockout control module;
when a plurality of storage battery packs exist in the discharging loop and are in a discharging nuclear capacity state, the locking control module is used for locking the switch closing function of a second switch unit corresponding to the storage battery pack which is not in the discharging nuclear capacity state and a third switch unit corresponding to the storage battery pack which is in the discharging nuclear capacity state.
7. A control system for a battery discharge circuit of an electrochemical energy storage power station, comprising a controller and the battery discharge circuit of the electrochemical energy storage power station of any one of claims 1-6;
the controller is used for receiving a discharging/charging instruction of a user and controlling the working state of the discharging loop based on the instruction.
8. A method of controlling a discharge circuit of an electrochemical energy storage power station cell, the method comprising:
receiving a discharge nuclear capacity instruction, wherein the discharge nuclear capacity instruction comprises information of a storage battery pack for carrying out discharge nuclear capacity;
closing the first switch unit to enable the nuclear capacity device to be connected with the discharging bus;
detecting whether a third switch unit corresponding to a storage battery pack for discharging the nuclear capacity is in an off state or not;
if not, the third switch unit corresponding to the storage battery pack for discharging the nuclear capacity is disconnected;
closing a second switch unit corresponding to the storage battery pack for discharging the nuclear capacity, so that the storage battery pack for discharging the nuclear capacity is connected with a discharging bus;
when a plurality of storage battery packs are in a discharge nuclear capacity state, the first switch unit connects the nuclear capacity device to a discharge bus so that the nuclear capacity device is connected with the discharge bus, then the discharge ends of the storage battery packs in the discharge nuclear capacity state are connected to the discharge bus through the second switch units corresponding to the storage battery packs in the discharge nuclear capacity state, so that the storage battery packs in the discharge nuclear capacity state flow into the discharge bus through the second switch units, and the nuclear capacity device is used for checking the current flowing through the discharge bus to carry out nuclear capacity on the storage battery packs;
when a plurality of storage battery packs are in a charging state, the charging ends of the storage battery packs in the discharging capacity state are connected into a charging bus through the third switch units corresponding to the storage battery packs in the discharging capacity state, so that the storage battery packs are charged.
9. The control method according to claim 8, characterized by further comprising:
receiving a discharge stopping nuclear capacity instruction, wherein the discharge stopping nuclear capacity instruction comprises information of a storage battery pack with discharge stopping nuclear capacity;
disconnecting a second switch unit corresponding to the storage battery pack with the stopping discharge capacity, so that the storage battery pack with the stopping discharge capacity is disconnected from the discharge bus;
checking whether the storage battery pack is in a discharge capacity state;
if not, the first switch unit is disconnected, so that the nuclear capacity device is disconnected from the discharging bus.
10. The control method according to claim 8, characterized by further comprising:
receiving a charging instruction, wherein the charging instruction comprises information of a storage battery pack to be charged;
detecting whether a second switch unit corresponding to the storage battery pack to be charged is in an off state or not;
if not, the second switch unit corresponding to the storage battery pack to be charged is disconnected;
and closing a third switch unit corresponding to the storage battery pack to be charged, so that the storage battery pack to be charged is connected with a charging bus.
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| CN113030762A (en) * | 2021-02-05 | 2021-06-25 | 国网宁夏电力有限公司吴忠供电公司 | Station storage battery pack checking discharge test method |
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| US20170207639A1 (en) * | 2016-01-15 | 2017-07-20 | Ranch Systems Llc | Virtual battery comprising individually managed energy storage units |
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