CN113991877A - Energy storage system, control method, and storage medium - Google Patents
Energy storage system, control method, and storage medium Download PDFInfo
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- CN113991877A CN113991877A CN202111412942.7A CN202111412942A CN113991877A CN 113991877 A CN113991877 A CN 113991877A CN 202111412942 A CN202111412942 A CN 202111412942A CN 113991877 A CN113991877 A CN 113991877A
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- 238000004146 energy storage Methods 0.000 title claims abstract description 250
- 238000000034 method Methods 0.000 title claims abstract description 37
- 230000001502 supplementing effect Effects 0.000 claims abstract description 22
- 239000013589 supplement Substances 0.000 claims abstract description 18
- 238000004590 computer program Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 4
- 238000007599 discharging Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- HEZMWWAKWCSUCB-PHDIDXHHSA-N (3R,4R)-3,4-dihydroxycyclohexa-1,5-diene-1-carboxylic acid Chemical compound O[C@@H]1C=CC(C(O)=O)=C[C@H]1O HEZMWWAKWCSUCB-PHDIDXHHSA-N 0.000 description 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 230000002457 bidirectional effect Effects 0.000 description 1
- 239000007772 electrode material Substances 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J15/00—Systems for storing electric energy
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00306—Overdischarge protection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The present disclosure provides an energy storage system, a control method and a storage medium, which relate to the technical field of energy storage, wherein the system comprises: the system comprises an energy storage device, an energy storage DC device, a DC/DC plate and a battery management system BMS device; the energy storage device is connected with the power supply system through an energy storage DC device; the first end of the DC/DC plate is connected with the electric energy supplementing branch, and the second end of the DC/DC plate is respectively connected with the energy storage DC device and the BMS device; the first end of the electric energy supplementing branch circuit is connected to a first connecting circuit between the energy storage device and the energy storage DC device, and the second end of the electric energy supplementing branch circuit is connected to a second connecting circuit between the energy storage DC device and the power supply system. According to the system, the control method and the storage medium, when the power supply system recovers power supply, the energy storage system can automatically recover work and supplement power, the over-discharge condition of the energy storage device is reduced, manual operation is not needed, the problem of energy storage over-discharge can be effectively solved, and potential safety hazards caused by energy storage over-discharge are prevented.
Description
Technical Field
The present invention relates to the field of energy storage technologies, and in particular, to an energy storage system, a control method, and a storage medium.
Background
With the large-scale development and application of new energy, the battery energy storage technology is rapidly developed. The over-discharge of the battery, i.e. over-discharge, means that the electric energy stored in the battery is gradually released, the voltage slowly drops, and the battery continues to discharge when the voltage drops to a certain specified value. Overdischarge of the battery may cause damage to the electrode active material, and the life of the battery may be shortened. In the application of the energy storage system, the over-discharge phenomenon easily occurs in the energy storage system, and the service life of the energy storage system is influenced by the over-discharge state. At present, when the energy storage system is overdischarged, manual operation is needed for recovery, the operation is complex, the overdischarge of the energy storage system is not timely recovered, and potential safety hazards are easily caused.
Disclosure of Invention
In view of the above, an object of the present invention is to provide an energy storage system, a control method and a storage medium, wherein the energy storage system can automatically resume working and perform power compensation when a power supply system resumes power supply in an over-discharge state of the energy storage system.
According to a first aspect of the present disclosure, there is provided an energy storage system comprising: the system comprises an energy storage device, an energy storage DC device, a DC/DC plate and a battery management system BMS device; the energy storage device is connected with a power supply system through the energy storage DC device; the first end of the DC/DC plate is connected with an electric energy supplement branch, and the second end of the DC/DC plate is respectively connected with the energy storage DC device and the BMS device; the first end of the electric energy supplementing branch circuit is connected to a first connecting circuit between the energy storage device and the energy storage DC device, and the second end of the electric energy supplementing branch circuit is connected to a second connecting circuit between the energy storage DC device and the power supply system.
Optionally, a first switching unit; the first switching unit is disposed on the power supplement branch, and the first switching unit is located between the first end of the DC/DC block and the first connection line.
Optionally, the first switching unit includes: a first manual switch and a first contactor; arranging the first manual switch and the first contactor on the electric energy supplementing branch and in a connecting line of the DC/DC block and the first connecting line, wherein the first manual switch and the first contactor are arranged in parallel; the first contactor is connected with the BMS device.
Optionally, the first switching unit includes: a second contactor; providing the second contactor in a connection line of the DC/DC block and the first connection line; the second contactor is connected with the energy storage DC device.
Optionally, a second switching unit; and the second switch unit is arranged on the electric energy supplementing branch and between the first end of the DC/DC plate and the second connecting line.
Optionally, the second switching unit includes: a second manual switch; and the second manual switch is arranged on the electric energy supplement branch and in a connecting line between the DC/DC board and the second connecting line.
Optionally, the second switching unit includes: a third contactor; the third contactor is arranged on the electric energy supplementing branch and in a connecting line of the DC/DC plate and the second connecting line; the third contactor is connected with the energy storage DC device.
Optionally, a third switching unit; the third switching unit is provided in a connection line between the energy storage DC device and the energy storage device.
Optionally, the third switching unit includes: a fourth contactor, a resistor and a fifth contactor; the fourth contactor is connected with the resistor in series to form a current limiting circuit; and the current limiting circuit and the fifth contactor are arranged in a positive connecting wire between the energy storage device and the energy storage DC device, wherein the current limiting circuit and the fifth contactor are arranged in parallel.
Optionally, the second end of the DC/DC board is connected with the BMS device, and the energy storage DC device is connected between the DC/DC board and the BMS device through a connection line.
Optionally, the power supply system comprises: at least one of a mains power supply system and a photovoltaic power supply system.
According to a second aspect of the present disclosure, there is provided a control method of an energy storage system including: the energy storage device, the energy storage DC device, the DC/DC plate and the BMS device; the energy storage device is connected with a power supply system through the energy storage DC device; the first end of the DC/DC plate is connected to an electric energy supplement branch, and the second end of the DC/DC plate is respectively connected with the energy storage DC device and the BMS device; the first end of the electric energy supplementing branch circuit is connected to a first connecting circuit between the energy storage device and the energy storage DC device, and the second end of the electric energy supplementing branch circuit is connected to a second connecting circuit between the energy storage DC device and the power supply system; the first switch unit is arranged on the electric energy supplement branch and between the first end of the DC/DC plate and the first connecting line; the control method comprises the following steps: when the power supply system supplies power, the DC/DC board transmits the power on the power supplement branch to the energy storage DC device and the BMS device so that the energy storage DC device and the BMS device are in working states; and when the energy storage device is in a first over-discharge state, the BMS device controls the first switch unit to be switched on so that the power supply system charges the energy storage device.
Optionally, the first switching unit includes: a first manual switch and a first contactor; the first manual switch and the first contactor are arranged on the electric energy supplementing branch and in a connecting line of the DC/DC block and the first connecting line, and the first manual switch and the first contactor are arranged in parallel; the first contactor is connected with the BMS device, and the BMS device is conducted by controlling the first contactor so that the power supply system charges the energy storage device.
Optionally, the first switching unit includes: a second contactor; providing the second contactor in a connection line of the DC/DC block and the first connection line; the second contactor is connected with the energy storage DC device; the second contactor is a normally closed contactor, and the energy storage DC device is used for controlling the on-off of the second contactor.
Optionally, providing the third switching unit in a connection line between the energy storage DC device and the energy storage device includes: when the energy storage device is in a second over-discharge state, the BMS device controls the third switching unit to be conducted; the energy storage DC device is in a charging state, so that the power supply system charges the energy storage device through the energy storage DC device; and the residual capacity of the energy storage device in the second over-discharge state is greater than that of the energy storage device in the first over-discharge state.
Optionally, the third switching unit includes: a fourth contactor, a resistor and a fifth contactor; the fourth contactor is connected with the resistor in series to form a current limiting circuit; the current limiting circuit and the fifth contactor are arranged in a positive connecting line between the energy storage device and the energy storage DC device, and the current limiting circuit and the fifth contactor are arranged in parallel; the method comprises the following steps: when the energy storage device is in a second over-discharge state or a normal working state, the BMS device controls the fourth contactor to be conducted and controls the fifth contactor to be disconnected, so that the power supply system can pre-charge the energy storage device; after the pre-charging is completed, the BMS device controls the fifth contactor to be turned on and controls the fourth contactor to be turned off.
Optionally, when the power supply system is not supplying power, and when the energy storage device is in the second over-discharge state, the energy storage DC device enters a standby state; after a preset time period, if the power supply system does not supply power, the BMS device controls the first contactor to be turned off.
Optionally, in a state where the power supply system is not supplying power and the energy storage system needs to be started, when the first manual switch is in a closed state, the DC/DC board transmits the power of the energy storage device to the energy storage DC device and the BMS device so that the energy storage DC device and the BMS device are in an operating state; the BMS device controls the first contactor to be conducted.
Optionally, the second switching unit includes: a second manual switch and a third contactor; the second manual switch is a normally closed manual switch, and the third contactor is a normally closed contactor; the second manual switch and the third contactor are arranged on the electric energy supplement branch and in a connecting line of the DC/DC plate and the second connecting line; the third contactor is connected with the energy storage DC device, and the energy storage DC device is used for controlling the on-off of the third contactor.
According to a third aspect of the present disclosure, there is provided a computer readable storage medium storing computer instructions for execution by a processor to perform the method as described above.
According to the energy storage system, the control method and the storage medium, when the power supply system recovers power supply, the energy storage system can automatically recover work and supplement power, the over-discharge condition of the energy storage device is reduced, manual operation is not needed, the operation is simple, the problem of over-discharge of stored energy can be effectively solved, and potential safety hazards caused by over-discharge of stored energy are prevented.
Drawings
In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and other drawings can be obtained by those skilled in the art without inventive exercise.
FIG. 1 is a block schematic diagram of one embodiment of an energy storage system according to the present disclosure;
FIG. 2 is a block schematic diagram of another embodiment of an energy storage system according to the present disclosure;
FIG. 3 is a block schematic diagram of yet another embodiment of an energy storage system according to the present disclosure;
FIG. 4 is a schematic flow diagram of an embodiment of a method of controlling an energy storage system according to the present disclosure;
fig. 5 is a schematic flow chart of charging an energy storage device in an embodiment of a control method of an energy storage system according to the present disclosure.
Detailed Description
The present disclosure now will be described more fully hereinafter with reference to the accompanying drawings, in which exemplary embodiments of the disclosure are shown. The technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the drawings in the embodiments of the present disclosure, and it is obvious that the described embodiments are only a part of the embodiments of the present disclosure, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure.
The terms "first" and "second" are used only for descriptive distinction and have no other special meaning.
In one embodiment, as shown in fig. 1, the present disclosure provides an energy storage system comprising: energy storage device 10, energy storage DC device 20, DC/DC board 30, and BMS (Battery Management System) device 40. Energy storage device 10 includes a battery, which may be of various types, such as a lithium battery. Energy storage device 10 may provide electrical power to a variety of household appliances, devices, and the like.
The energy storage DC device 20 may be a plurality of energy storage DC devices, may implement the function of a bidirectional DC/DC converter, may automatically switch a charging or discharging mode, may send a control command to control various switches, and the like. The DC/DC board 30 is a circuit board, and can function as a DC/DC converter, and the output DC power can be 12V, 24V, 36V, or the like. The BMS device 40 may be a variety of BMS devices capable of monitoring the state of the energy storage device and controlling various devices, etc.
The energy storage device 10 is connected to a power supply system 50 through the energy storage DC device 20, and the power supply system 50 includes at least one of a commercial power supply system and a photovoltaic power supply system. The DC/DC board 30 has a first end connected to the power supplementing branch 91 and a second end connected to the energy storage DC device 20 and the BMS device 40, respectively. The first end of the power supplementing branch 91 is connected to a first connection line 92 between the energy storage device 10 and the energy storage DC device 20, and the second end is connected to a second connection line 93 between the energy storage DC device 20 and the power supply system 50.
The BMS device 40 determines whether the energy storage device 10 has an over-discharge by detecting parameters of the energy storage device 10, such as voltage, current, and the like. Under the state that energy storage device 10 overdischarges, when commercial power supply system or photovoltaic power supply system etc. insert, the electric energy supplyes branch 91, DC/DC plate 30 and offers energy storage DC device 20, energy storage DC device 20 through the electric energy to make energy storage DC device 20, energy storage DC device 20 get into operating condition, can carry out automatic recovery to the overdischarge of energy storage device 10, mend the electricity to energy storage device 10, need not artificial operation.
As shown in fig. 2, the first switching unit 60 is disposed on the power supplementing branch 91 between the first end of the DC/DC block 30 and the first connection line 92. The first switching unit 60 may be a variety of switching units for controlling the on/off of the connection line between the first end of the DC/DC board block 30 and the first connection line 92.
The first switching unit 60 includes a first manual switch and a first contactor. As shown in fig. 3, the first manual switch is a manual breaker QF1, and the first contactor is a dc contactor K4. QF1 and K4 are provided in the connection line between the DC/DC board 30 and the first connection line, QF1 and K4 are provided in parallel, K4 is connected to the BMS device 40, and the BMS device 40 is used to control the on/off of K4.
The first switching unit includes a second contactor. As shown in fig. 3, the second contactor is a normally closed DC contactor K3, and a connection line between the DC/DC board 30 and the first connection line is provided with a K3; the K3 is connected with the energy storage DC device 20, and the energy storage DC device 20 is used for controlling the on-off of the K3. The energy storage DC device 20 may also control the switching of other contactors.
As shown in fig. 2, a second switching unit 70 is provided on the power replenishing branch 91 between the first end of the DC/DC board block 30 and the second connection line 93. The second switching unit 70 may be a variety of switching units for controlling the on/off of the connection line between the first end of the DC/DC board block 30 and the second connection line 93.
The second switching unit 70 includes a second manual switch. As shown in fig. 3, the second manual switch is a manual breaker QF2, and QF2 is provided in the connection line between the DC/DC board 30 and the second connection line. The second switch unit comprises a third contactor which is a normally closed direct current contactor K5. K5 is provided in the connection line between the DC/DC board 30 and the second connection line. The K5 is connected with the energy storage DC device 20, and the energy storage DC device 20 is used for controlling the on-off of the K5.
As shown in fig. 2, a third switching unit 80 is provided in the connection line between the energy storage DC device 20 and the energy storage device 10. The third switching unit 80 may be a variety of switching units for controlling the connection line between the energy storage DC device 20 and the energy storage device 10 to be opened and closed.
The third switching unit 80 includes a fourth contactor, a resistor, and a fifth contactor. As shown in fig. 3, the fourth contactor is a dc contactor K1, the resistor is R1, and the fifth contactor is a dc contactor K2. K1 and R1 are connected in series to form a current limiting circuit, and the current limiting circuit and K2 are arranged in the positive connecting line between the energy storage device 10 and the energy storage DC device 20, and the current limiting circuit and the K2 are arranged in parallel.
The DC/DC board 30 can be connected to the BMS mounting/40 and the energy storage DC device 20 in various ways. For example, as shown in fig. 3, the DC/DC block 30 is connected to the BMS device 40, and the energy storage DC device 20 is connected between the DC/DC block 30 and the BMS device 40 through a connection line.
Fig. 4 is a schematic flow chart of an embodiment of a control method of an energy storage system according to the present disclosure, as shown in fig. 4:
In step 402, the BMS device controls the first switching unit to be turned on when the energy storage device is in the first overdischarge state, so that the power supply system charges the energy storage device.
Various over-discharge states can be set for the energy storage device, such as a first over-discharge state, a second over-discharge state and the like, and a normal working state can be set for the energy storage device. The BMS device may detect a voltage of the energy storage device and determine a state of the energy storage device based on the voltage. For example, a plurality of voltage safety thresholds V1, V2, and V3 may be set, wherein V1> V2> V3. If the voltage of the energy storage device is less than V3, the energy storage device is in a first over-discharge state (a severe over-discharge state of the stored energy); if the voltage of the energy storage device is less than V1 and greater than or equal to V2, the energy storage device is in a second overdischarge state (an energy storage slight overdischarge state); if the voltage of the energy storage device is greater than V1, the energy storage device is in a normal operating state. The BMS device may transmit the first over-discharge state, the second over-discharge state, and the normal operation state information of the energy storage device to the energy storage DC device, and the energy storage DC device may perform a corresponding operation according to the state information, for example, automatically switch a charging or discharging mode, and may transmit a control command to control various switches, etc.
When the energy storage device is in a second over-discharge state, the BMS device controls the third switching unit to be conducted; the energy storage DC device is in a charging state, so that the power supply system charges the energy storage device through the energy storage DC device. The remaining capacity of the energy storage device in the second over-discharge state is greater than the remaining capacity of the energy storage device in the first over-discharge state.
Fig. 5 is a schematic flowchart of a process of charging an energy storage device according to an embodiment of the control method of the energy storage system of the present disclosure, as shown in fig. 5:
and step 501, when the energy storage device is in the second over-discharge state or the normal working state, the BMS device controls the fourth contactor to be switched on and controls the fifth contactor to be switched off so that the power supply system can pre-charge the energy storage device.
In step 502, after the pre-charging is completed, the BMS device controls the fifth contactor to be turned on and controls the fourth contactor to be turned off.
When the power supply system does not supply power, and the energy storage device is in a second over-discharge state, the energy storage DC device enters a standby state; after a preset time period, if the power supply system still does not supply power, the BMS device controls the first contactor to be turned off. The preset time period may be 3, 5, 10 minutes, etc.
In a state where the power supply system is not supplying power and it is necessary to start the energy storage system, when the first manual switch is in a closed state, the DC/DC board block transmits the power of the energy storage device to the energy storage DC device and the BMS device so that the energy storage DC device and the BMS device are in an operating state. The BMS device controls the first contactor to be conducted. When pressing first manual switch button through manual, make energy storage DC device and BMS device get electric, the first contactor of BMS device control switches on, can loosen first manual switch button this moment.
In one embodiment, as shown in fig. 3, the power supply system includes a PV (utility system) 51, a DCDC converter 52, a DCDC24V power supply 53, and a LOAD (photovoltaic power supply system) 55. The 24V power supply 54 can draw electricity. When the power supply system is not powered, the energy storage system normally runs, the QF2 is in a closed state, at this time, the QF1 is pressed first, the DC/DC board 30 is powered, the BMS device 40 and the energy storage DC device 20 are also powered, and the BMS device 40 is closed to obtain the K4. The BMS device 40 controls the K1 to power on for pre-charging, and when pre-charging is complete, the BMS device 40 closes K2 and opens K1. After detecting that the energy storage system is free of faults, the energy storage system works normally.
When the energy storage device 10 is in a slight overdischarge state (second overdischarge state), the energy storage DC device 20 is changed to a charging state when photovoltaic or commercial power is connected. If no photovoltaic power or mains supply is connected at this time, the energy storage DC device 20 enters a standby state and stops working. After 5 minutes, the battery is still unable to charge, and BMS device 40 turns off K4, the energy storage system automatically shuts down, preventing overdischarge.
When the energy storage device 10 is slightly over-discharged, the power supply system is not powered, manual restart can be carried out, the QF2 is in a closed state, the QF1 is pressed first, the DC/DC board 30 is powered, the BMS device 40 and the energy storage DC device 20 are also powered, and the BMS device 40 is closed to K4.
When the commercial power or the photovoltaic is recovered, the QF2 and the K5 are in a normally closed state, the DC/DC board 30 is powered, the BMS device 40 and the energy storage DC device 20 are also powered, when the BMS device 40 detects that the energy storage device 10 is slightly over-discharged, the energy storage DC device 20 is converted into a charging state, and the BMS device 40 controls the K1 to be powered for pre-charging; when the pre-charging is complete, the BMS device 40 closes K2 and opens K1.
When the energy storage device 10 is in a slight overdischarge state, although the energy storage system is not started, the energy storage device 10 may be in a self-discharge state, and after a long time (for example, more than half a year), the energy storage device 10 is in a severe overdischarge state (first overdischarge state), and at this time, the remaining power is insufficient to support the system to operate.
When the energy storage device 10 is in a severe overdischarge state (first overdischarge state), when the commercial power or the photovoltaic is recovered, since the QF2 and the K5 are in a normally closed state, the DC/DC board 30 is powered, and the BMS device 40 and the energy storage DC device 20 are also powered, at which time the BMS device 40 and the energy storage DC device 20 are in an operating state, and when the BMS device 40 detects that the battery is in a severe overdischarge state, the K3 and the K4 are controlled to be closed, and the photovoltaic/commercial power is used for direct charging. After a period of time, when the energy storage device 10 is in a slight overdischarge state (second overdischarge state), the energy storage device 10 is controlled to be charged according to the above-described charging method in which the energy storage device 10 is in the slight overdischarge state.
In one embodiment, the present disclosure provides a computer-readable storage medium storing computer instructions that, when executed by a processor, implement a method of controlling an energy storage system as in any one of the above embodiments.
According to the energy storage system, the control method and the storage medium in the embodiment, when the power supply system recovers power supply, the energy storage system can automatically recover work and supplement power, the over-discharge condition of the energy storage device is reduced, manual operation is not needed, the operation is simple, the problem of over-discharge of the stored energy can be effectively solved, and potential safety hazards caused by over-discharge of the stored energy are prevented.
The method and system of the present disclosure may be implemented in a number of ways. For example, the methods and systems of the present disclosure may be implemented by software, hardware, firmware, or any combination of software, hardware, and firmware. The above-described order for the steps of the method is for illustration only, and the steps of the method of the present disclosure are not limited to the order specifically described above unless specifically stated otherwise. Further, in some embodiments, the present disclosure may also be embodied as programs recorded in a recording medium, the programs including machine-readable instructions for implementing the methods according to the present disclosure. Thus, the present disclosure also covers a recording medium storing a program for executing the method according to the present disclosure.
The description of the present disclosure has been presented for purposes of illustration and description, and is not intended to be exhaustive or limited to the disclosure in the form disclosed. Many modifications and variations will be apparent to practitioners skilled in this art. The embodiment was chosen and described in order to best explain the principles of the disclosure and the practical application, and to enable others of ordinary skill in the art to understand the disclosure for various embodiments with various modifications as are suited to the particular use contemplated.
Claims (20)
1. An energy storage system, comprising:
the system comprises an energy storage device, an energy storage DC device, a DC/DC plate and a battery management system BMS device;
the energy storage device is connected with a power supply system through the energy storage DC device; the first end of the DC/DC plate is connected with an electric energy supplement branch, and the second end of the DC/DC plate is respectively connected with the energy storage DC device and the BMS device; the first end of the electric energy supplementing branch circuit is connected to a first connecting circuit between the energy storage device and the energy storage DC device, and the second end of the electric energy supplementing branch circuit is connected to a second connecting circuit between the energy storage DC device and the power supply system.
2. The energy storage system of claim 1, comprising:
a first switch unit; the first switching unit is disposed on the power supplement branch, and the first switching unit is located between the first end of the DC/DC block and the first connection line.
3. The energy storage system of claim 2,
the first switching unit includes: a first manual switch and a first contactor;
arranging the first manual switch and the first contactor on the electric energy supplementing branch and in a connecting line of the DC/DC block and the first connecting line, wherein the first manual switch and the first contactor are arranged in parallel; the first contactor is connected with the BMS device.
4. The energy storage system of claim 3,
the first switching unit includes: a second contactor;
providing the second contactor in a connection line of the DC/DC block and the first connection line; the second contactor is connected with the energy storage DC device.
5. The energy storage system of claim 1, comprising:
a second switching unit; and the second switch unit is arranged on the electric energy supplementing branch and between the first end of the DC/DC plate and the second connecting line.
6. The energy storage system of claim 5,
the second switching unit includes: a second manual switch; and the second manual switch is arranged on the electric energy supplement branch and in a connecting line between the DC/DC board and the second connecting line.
7. The energy storage system of claim 5,
the second switching unit includes: a third contactor;
the third contactor is arranged on the electric energy supplementing branch and in a connecting line of the DC/DC plate and the second connecting line; the third contactor is connected with the energy storage DC device.
8. The energy storage system of claim 1, comprising:
a third switching unit; the third switching unit is provided in a connection line between the energy storage DC device and the energy storage device.
9. The energy storage system of claim 8,
the third switching unit includes: a fourth contactor, a resistor and a fifth contactor;
the fourth contactor is connected with the resistor in series to form a current limiting circuit; and the current limiting circuit and the fifth contactor are arranged in a positive connecting wire between the energy storage device and the energy storage DC device, wherein the current limiting circuit and the fifth contactor are arranged in parallel.
10. The energy storage system of claim 1,
the second end of the DC/DC block is connected with the BMS device, and the energy storage DC device is connected between the DC/DC block and the BMS device through a connection line.
11. The energy storage system of any of claims 1 to 10,
the power supply system includes: at least one of a mains power supply system and a photovoltaic power supply system.
12. A control method of an energy storage system, the energy storage system comprising: the energy storage device, the energy storage DC device, the DC/DC plate and the BMS device; the energy storage device is connected with a power supply system through the energy storage DC device; the first end of the DC/DC plate is connected to an electric energy supplement branch, and the second end of the DC/DC plate is respectively connected with the energy storage DC device and the BMS device; the first end of the electric energy supplementing branch circuit is connected to a first connecting circuit between the energy storage device and the energy storage DC device, and the second end of the electric energy supplementing branch circuit is connected to a second connecting circuit between the energy storage DC device and the power supply system; the first switch unit is arranged on the electric energy supplement branch and between the first end of the DC/DC plate and the first connecting line; the method comprises the following steps:
when the power supply system supplies power, the DC/DC board transmits the power on the power supplement branch to the energy storage DC device and the BMS device so that the energy storage DC device and the BMS device are in a working state;
and when the energy storage device is in a first over-discharge state, the BMS device controls the first switch unit to be switched on so that the power supply system charges the energy storage device.
13. The method of claim 12, wherein the first switching unit comprises: a first manual switch and a first contactor; the first manual switch and the first contactor are arranged on the electric energy supplementing branch and in a connecting line of the DC/DC block and the first connecting line, and the first manual switch and the first contactor are arranged in parallel;
the first contactor is connected with the BMS device, and the BMS device is conducted by controlling the first contactor so that the power supply system charges the energy storage device.
14. The method of claim 13, wherein,
the first switching unit includes: a second contactor; providing the second contactor in a connection line of the DC/DC block and the first connection line; the second contactor is connected with the energy storage DC device; the second contactor is a normally closed contactor, and the energy storage DC device is used for controlling the on-off of the second contactor.
15. The method of claim 13, wherein the third switching unit is provided in a connection line between the energy storage DC device and the energy storage device, the control method comprising:
when the energy storage device is in a second over-discharge state or a normal working state, the BMS device controls the third switching unit to be conducted;
the energy storage DC device is in a charging state, so that the power supply system charges the energy storage device through the energy storage DC device; the residual capacity of the energy storage device in the second over-discharge state is greater than the residual capacity of the energy storage device in the first over-discharge state.
16. The method of claim 15, wherein the third switching unit comprises: a fourth contactor, a resistor and a fifth contactor; the fourth contactor is connected with the resistor in series to form a current limiting circuit; the current limiting circuit and the fifth contactor are arranged in a positive connecting line between the energy storage device and the energy storage DC device, and the current limiting circuit and the fifth contactor are arranged in parallel; the method comprises the following steps:
when the energy storage device is in a second over-discharge state or a normal working state, the BMS device controls the fourth contactor to be conducted and controls the fifth contactor to be disconnected, so that the power supply system can pre-charge the energy storage device;
after the pre-charging is completed, the BMS device controls the fifth contactor to be turned on and controls the fourth contactor to be turned off.
17. The method of claim 16, further comprising:
when the power supply system is not powered and the energy storage device is in the second over-discharge state, the energy storage DC device enters a standby state;
after a preset time period, if the power supply system does not supply power, the BMS device controls the first contactor to be turned off.
18. The method of claim 13, further comprising:
when the first manual switch is in a closed state in a state that the power supply system is not powered and the energy storage system needs to be started, the DC/DC board transmits the electric energy of the energy storage device to the energy storage DC device and the BMS device so that the energy storage DC device and the BMS device are in a working state;
the BMS device controls the first contactor to be conducted.
19. The method of claim 12, wherein the second switching unit comprises: a second manual switch and a third contactor; the second manual switch is a normally closed manual switch, and the third contactor is a normally closed contactor; the second manual switch and the third contactor are arranged on the electric energy supplement branch and in a connecting line of the DC/DC plate and the second connecting line; the third contactor is connected with the energy storage DC device, and the energy storage DC device is used for controlling the on-off of the third contactor.
20. A computer readable storage medium having stored thereon computer program instructions which, when executed by one or more processors, implement the steps of the method of any one of claims 12 to 19.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111412942.7A CN113991877A (en) | 2021-11-25 | 2021-11-25 | Energy storage system, control method, and storage medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111412942.7A CN113991877A (en) | 2021-11-25 | 2021-11-25 | Energy storage system, control method, and storage medium |
Publications (1)
| Publication Number | Publication Date |
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| CN113991877A true CN113991877A (en) | 2022-01-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111412942.7A Pending CN113991877A (en) | 2021-11-25 | 2021-11-25 | Energy storage system, control method, and storage medium |
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| Country | Link |
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| CN (1) | CN113991877A (en) |
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2021
- 2021-11-25 CN CN202111412942.7A patent/CN113991877A/en active Pending
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