CN117879094A - Control method, controller, energy storage system and computer readable storage medium - Google Patents
Control method, controller, energy storage system and computer readable storage medium Download PDFInfo
- Publication number
- CN117879094A CN117879094A CN202311792721.6A CN202311792721A CN117879094A CN 117879094 A CN117879094 A CN 117879094A CN 202311792721 A CN202311792721 A CN 202311792721A CN 117879094 A CN117879094 A CN 117879094A
- Authority
- CN
- China
- Prior art keywords
- power
- battery cluster
- energy storage
- abnormal battery
- voltage difference
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000004146 energy storage Methods 0.000 title claims abstract description 237
- 238000000034 method Methods 0.000 title claims abstract description 46
- 230000002159 abnormal effect Effects 0.000 claims abstract description 265
- 238000007599 discharging Methods 0.000 claims description 43
- 238000004590 computer program Methods 0.000 claims description 6
- 230000001105 regulatory effect Effects 0.000 abstract description 13
- 230000002035 prolonged effect Effects 0.000 description 8
- 230000008569 process Effects 0.000 description 7
- 230000006870 function Effects 0.000 description 6
- 230000007774 longterm Effects 0.000 description 2
- 230000005404 monopole Effects 0.000 description 2
- 108010001267 Protein Subunits Proteins 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The invention discloses a control method, a controller, an energy storage system and a computer readable storage medium. The control method may be used in an energy storage system comprising a plurality of energy storage subunits, each comprising one or more battery clusters. The control method comprises the following steps: determining a first energy storage subunit and a second energy storage subunit in the plurality of energy storage subunits, wherein the first energy storage subunit comprises an abnormal battery cluster and a normal battery cluster, and the voltage difference between the abnormal battery cluster and the normal battery cluster is larger than a preset voltage difference; and regulating the working power of the abnormal battery cluster and the working power of the second energy storage subunit according to the dispatching power so that the voltage difference between the abnormal battery cluster and the normal battery cluster is smaller than the preset voltage difference. According to the control method, the working power of the abnormal battery cluster and the working power of the second energy storage subunit are regulated according to the dispatching power, so that the pressure difference between the abnormal battery cluster and the normal battery cluster is reduced, and the pressure difference between the abnormal battery cluster and the normal battery cluster is smaller than a preset pressure difference.
Description
Technical Field
The present invention relates to the field of energy storage technology, and more particularly, to a control method, a controller, an energy storage system, and a computer readable storage medium.
Background
The series-type energy storage system consists of a plurality of monopole energy storage subunits, wherein each subunit consists of one or a plurality of battery clusters Rack. When a plurality of racks share one direct current bus in the subunit, if the voltage difference is too large in the battery closing process, current can be generated at the closing moment, and the service life of the battery contactor is influenced. In order to prolong the service life of the battery contactor, in the related art, it is determined that if the voltage difference of the Rack to be closed is too large, the Rack with the voltage difference within the allowable range is not allowed to be closed before the battery is closed. Therefore, in the actual operation process of the energy storage system, certain Rack with larger voltage difference is always in a state of being incapable of being closed, the battery cannot be closed again due to undervoltage caused by long-term non-participation in charge and discharge, and the service life of the battery can be influenced in severe cases.
Disclosure of Invention
Embodiments of the present invention provide a control method, a controller, an energy storage system, and a computer-readable storage medium.
An embodiment of the present invention provides a control method for an energy storage system, where the energy storage system includes a plurality of energy storage subunits, each of the energy storage subunits includes one or more battery clusters, and the control method includes: determining a first energy storage subunit and a second energy storage subunit in the plurality of energy storage subunits, wherein the first energy storage subunit comprises an abnormal battery cluster and a normal battery cluster, the voltage difference between the abnormal battery cluster and the normal battery cluster is larger than a preset voltage difference, and the second energy storage subunit is other energy storage subunits except the first energy storage subunit in the plurality of energy storage subunits; and adjusting the working power of the abnormal battery cluster and the working power of the second energy storage subunit according to the dispatching power so that the voltage difference between the abnormal battery cluster and the normal battery cluster is smaller than the preset voltage difference.
In the control method, the working power of the abnormal battery cluster and the working power of the second energy storage subunit are regulated according to the dispatching power, so that the voltage difference between the abnormal battery cluster and the normal battery cluster is reduced, the voltage difference between the abnormal battery cluster and the normal battery cluster is smaller than the preset voltage difference, the abnormal battery cluster can be used normally, the problem of under-voltage of the battery caused by the fact that the abnormal battery cluster is always in a state of being unable to be closed is avoided, and the service life of the battery can be prolonged.
In some embodiments, the scheduling power is a charging power, and the adjusting the working power of the abnormal battery cluster and the working power of the second energy storage subunit according to the scheduling power, so that a voltage difference between the abnormal battery cluster and the normal battery cluster is smaller than the preset voltage difference, includes: and when the maximum chargeable power of the abnormal battery cluster is larger than the dispatching power and the voltage of the abnormal battery cluster is smaller than the voltage of the normal battery cluster, adjusting the charging power of the abnormal battery cluster to be the dispatching power, and adjusting the charging power of the second energy storage subunit to be zero so as to increase the voltage of the abnormal battery cluster, so that the voltage difference between the abnormal battery cluster and the normal battery cluster is smaller than the preset voltage difference.
In this way, the charging power of the abnormal battery cluster is adjusted to be the dispatching power, the charging power of the second energy storage subunit is adjusted to be zero, and the voltage difference between the abnormal battery cluster and the normal battery cluster is smaller than the preset voltage difference on the premise of meeting the dispatching power.
In some embodiments, the scheduling power is a charging power, and the adjusting the working power of the abnormal battery cluster and the working power of the second energy storage subunit according to the scheduling power, so that a voltage difference between the abnormal battery cluster and the normal battery cluster is smaller than the preset voltage difference, includes: and when the maximum chargeable power of the abnormal battery cluster is smaller than the dispatching power and the voltage of the abnormal battery cluster is smaller than the voltage of the normal battery cluster, adjusting the charging power of the abnormal battery cluster to be the maximum chargeable power, and adjusting the charging power of the second energy storage subunit to be the difference value between the dispatching power and the maximum chargeable power so as to increase the voltage of the abnormal battery cluster, so that the voltage difference between the abnormal battery cluster and the normal battery cluster is smaller than the preset voltage difference.
In this way, the charging power of the abnormal battery cluster is adjusted to be the maximum chargeable power, the charging power of the second energy storage subunit is adjusted to be the difference value between the dispatching power and the maximum chargeable power, and the voltage difference between the abnormal battery cluster and the normal battery cluster is smaller than the preset voltage difference on the premise of meeting the dispatching power.
In some embodiments, the scheduling power is a charging power, and the adjusting the working power of the abnormal battery cluster and the working power of the second energy storage subunit according to the scheduling power, so that a voltage difference between the abnormal battery cluster and the normal battery cluster is smaller than the preset voltage difference, includes: and when the chargeable total power of all the second energy storage subunits is larger than the dispatching power and the voltage of the abnormal battery cluster is larger than the voltage of the normal battery cluster, adjusting the chargeable power of the second energy storage subunits to be the chargeable total power, and adjusting the discharging power of the abnormal battery cluster to be the difference value between the chargeable total power and the dispatching power so as to reduce the voltage of the abnormal battery cluster, so that the voltage difference between the abnormal battery cluster and the normal battery cluster is smaller than the preset voltage difference.
In this way, the charging power of the second energy storage subunit is adjusted to be the chargeable total power, the discharging power of the abnormal battery cluster is adjusted to be the difference value between the chargeable total power and the dispatching power, and the voltage difference between the abnormal battery cluster and the normal battery cluster is smaller than the preset voltage difference on the premise of meeting the dispatching power.
In certain embodiments, the control method further comprises: and when the chargeable total power of all the second energy storage subunits is smaller than the scheduling power, adjusting the working power of the normal battery cluster and the working power of the second energy storage subunits according to the scheduling power.
Thus, when the second energy storage subunit cannot meet the dispatching power, the working power of the normal battery cluster and the working power of the second energy storage subunit can be adjusted to meet the dispatching power.
In some embodiments, the scheduling power is a discharging power, and the adjusting the working power of the abnormal battery cluster and the working power of the second energy storage subunit according to the scheduling power, so that a voltage difference between the abnormal battery cluster and the normal battery cluster is smaller than the preset voltage difference, includes: and when the total dischargeable power of all the second energy storage subunits is larger than the dispatching power and the voltage of the abnormal battery cluster is smaller than the voltage of the normal battery cluster, adjusting the discharging power of the second energy storage subunits to be the total dischargeable power, and adjusting the charging power of the abnormal battery cluster to be the difference value between the total dischargeable power and the dispatching power so as to increase the voltage of the abnormal battery cluster, so that the voltage difference between the abnormal battery cluster and the normal battery cluster is smaller than the preset voltage difference.
In this way, the discharging power of the second energy storage subunit is adjusted to be the total dischargeable power, the charging power of the abnormal battery cluster is adjusted to be the difference value between the total dischargeable power and the dispatching power, and the voltage difference between the abnormal battery cluster and the normal battery cluster is smaller than the preset voltage difference on the premise of meeting the dispatching power.
In certain embodiments, the control method further comprises: and when the total dischargeable power of all the second energy storage subunits is smaller than the scheduling power, adjusting the working power of the normal battery cluster and the working power of the second energy storage subunits according to the scheduling power.
Thus, when the second energy storage subunit cannot meet the dispatching power, the working power of the normal battery cluster and the working power of the second energy storage subunit can be adjusted to meet the dispatching power.
In some embodiments, the scheduling power is a discharging power, and the adjusting the working power of the abnormal battery cluster and the working power of the second energy storage subunit according to the scheduling power, so that a voltage difference between the abnormal battery cluster and the normal battery cluster is smaller than the preset voltage difference, includes: when the maximum dischargeable power of the abnormal battery cluster is larger than the scheduling power and the voltage of the abnormal battery cluster is larger than the voltage of the normal battery cluster, adjusting the discharging power of the abnormal battery cluster to be the scheduling power, and adjusting the discharging power of the second energy storage subunit to be zero so as to reduce the voltage of the abnormal battery cluster, so that the voltage difference between the abnormal battery cluster and the normal battery cluster is smaller than the preset voltage difference.
In this way, the discharging power of the abnormal battery cluster is adjusted to be the dispatching power, the discharging power of the second energy storage subunit is adjusted to be zero, and the voltage difference between the abnormal battery cluster and the normal battery cluster is smaller than the preset voltage difference on the premise of meeting the dispatching power.
In some embodiments, the scheduling power is a discharging power, and the adjusting the working power of the abnormal battery cluster and the working power of the second energy storage subunit according to the scheduling power, so that a voltage difference between the abnormal battery cluster and the normal battery cluster is smaller than the preset voltage difference, includes: and when the maximum dischargeable power of the abnormal battery cluster is smaller than the scheduling power and the voltage of the abnormal battery cluster is larger than the voltage of the normal battery cluster, adjusting the discharging power of the abnormal battery cluster to be the maximum dischargeable power of the abnormal battery cluster, and adjusting the discharging power of the second energy storage subunit to be the difference value between the scheduling power and the maximum dischargeable power so as to reduce the voltage of the abnormal battery cluster, so that the voltage difference between the abnormal battery cluster and the normal battery cluster is smaller than the preset voltage difference.
In this way, the discharging power of the abnormal battery cluster is adjusted to be the maximum dischargeable power of the abnormal battery cluster, the discharging power of the second energy storage subunit is adjusted to be the difference value between the dispatching power and the maximum dischargeable power, and the voltage difference between the abnormal battery cluster and the normal battery cluster is smaller than the preset voltage difference on the premise that the dispatching power is met.
An embodiment of the present invention provides a controller including one or more processors and a memory storing a computer program that, when executed by the processor, implements the steps of the control method of any of the above embodiments.
In the controller, the working power of the abnormal battery cluster and the working power of the second energy storage subunit are regulated according to the dispatching power, so that the voltage difference between the abnormal battery cluster and the normal battery cluster is reduced, the voltage difference between the abnormal battery cluster and the normal battery cluster is smaller than the preset voltage difference, the abnormal battery cluster can be used normally, the problem of under-voltage of the battery caused by the fact that the abnormal battery cluster is always in a state of being unable to be closed is avoided, and the service life of the battery can be prolonged.
An embodiment of the present invention provides an energy storage system comprising a controller of any of the embodiments described above and a plurality of energy storage subunits.
In the energy storage system, the working power of the abnormal battery cluster and the working power of the second energy storage subunit are regulated according to the dispatching power, so that the voltage difference between the abnormal battery cluster and the normal battery cluster is reduced, the voltage difference between the abnormal battery cluster and the normal battery cluster is smaller than the preset voltage difference, the abnormal battery cluster can be used normally, the problem of under-voltage of the battery caused by the fact that the abnormal battery cluster is always in a state of being unable to be closed is avoided, and the service life of the battery can be prolonged.
An embodiment of the present invention provides a computer-readable storage medium having stored thereon a computer program that, when executed by a processor, implements the steps of the control method of any of the above embodiments.
In the computer readable storage medium, the working power of the abnormal battery cluster and the working power of the second energy storage subunit are regulated according to the dispatching power, so that the voltage difference between the abnormal battery cluster and the normal battery cluster is reduced, the voltage difference between the abnormal battery cluster and the normal battery cluster is smaller than the preset voltage difference, the abnormal battery cluster can be used normally, the problem of under-voltage of the battery caused by the fact that the abnormal battery cluster is always in a state of being unable to be closed is avoided, and the service life of the battery can be prolonged.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The foregoing and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:
FIG. 1 is a schematic flow chart of a control method according to an embodiment of the present invention;
fig. 2 is a schematic diagram of an energy storage system according to an embodiment of the present invention.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are exemplary only for explaining the present invention and are not to be construed as limiting the present invention.
The series-type energy storage system consists of a plurality of monopole energy storage sub-units, wherein each sub-unit consists of an energy storage converter (Power Conversion System, PCS) and one or more battery clusters Rack. When a plurality of racks share one direct current bus in the subunit, if the voltage difference is too large in the battery closing process, current can be generated at the closing moment, and the service life of a battery contactor (used for connecting the PCS and a battery cluster) is affected. In order to prolong the service life of the battery contactor, in the related art, it is determined that if the voltage difference of the Rack to be closed is too large, the Rack with the voltage difference within the allowable range is not allowed to be closed before the battery is closed. Therefore, in the actual operation process of the energy storage system, certain Rack with larger voltage difference is always in a state of being incapable of being closed, the battery cannot be closed again due to undervoltage caused by long-term non-participation in charge and discharge, and the service life of the battery can be influenced in severe cases.
Referring to fig. 1 and 2, an embodiment of the present invention provides a control method for an energy storage system 1000. The energy storage system 1000 includes a plurality of energy storage subunits 100, each energy storage subunit 100 including one or more battery clusters 10, the control method comprising:
01: determining a first energy storage subunit and a second energy storage subunit in the plurality of energy storage subunits 100, wherein the first energy storage subunit comprises an abnormal battery cluster and a normal battery cluster, the voltage difference between the abnormal battery cluster and the normal battery cluster is larger than a preset voltage difference, and the second energy storage subunit is other energy storage subunits except the first energy storage subunit in the plurality of energy storage subunits 100;
02: and regulating the working power of the abnormal battery cluster and the working power of the second energy storage subunit according to the dispatching power so that the voltage difference between the abnormal battery cluster and the normal battery cluster is smaller than the preset voltage difference.
In the control method, the working power of the abnormal battery cluster and the working power of the second energy storage subunit are regulated according to the dispatching power, so that the voltage difference between the abnormal battery cluster and the normal battery cluster is reduced, the voltage difference between the abnormal battery cluster and the normal battery cluster is smaller than the preset voltage difference, the abnormal battery cluster can be used normally, the problem of under-voltage of the battery caused by the fact that the abnormal battery cluster is always in a state of being unable to be closed is avoided, and the service life of the battery can be prolonged.
Specifically, the energy storage system 1000 may be a string type energy storage system. The energy storage system 1000 includes a plurality of energy storage subunits 100, and the energy storage subunits 100 may be monopolar energy storage subunits. Each energy storage subunit 100 may individually control charging and discharging. Each energy storage subunit 100 may include an energy storage converter PCS and one or more battery clusters 10. Wherein the plurality may be two or more. In one embodiment, each energy storage subunit 100 of energy storage system 1000 may operate normally in a power overload condition of up to 110% rated power.
The PCS can realize the function of converting direct current into alternating current, and also can realize the function of converting alternating current into direct current. The PCS is connected with the battery cluster, and the PCS can be used for converting direct current of the battery cluster into alternating current of a power grid, or the PCS can be used for converting alternating current of the power grid into direct current of the battery cluster.
The control method of the embodiment of the invention can be realized by a controller. One controller may correspond to a plurality of energy storage sub-units 100, and in particular, the controller may control the charge and discharge of the battery cluster 10 by controlling the PCS and/or the switch group BCP, etc. For example, the controller may issue charge and discharge power to the PCS according to the scheduled power, and the PCS may control the power of the battery cluster 10 according to the issued charge and discharge power.
Specifically, it is determined whether an energy storage subunit 100 with a large voltage difference between the battery clusters and a battery cluster incapable of being fully closed exists in the energy storage system 1000, and these energy storage subunits are denoted as a first energy storage subunit, where the first energy storage subunit includes an abnormal battery cluster and a normal battery cluster, and the voltage difference between the abnormal battery cluster and the normal battery cluster is greater than a preset voltage difference, and the battery cluster cannot be fully closed due to the large voltage difference. Wherein a voltage average value of voltages of a plurality of battery clusters 100 of the same first energy storage subunit may be determined, the abnormal battery cluster is more deviated from the voltage average value than the normal battery cluster.
Under the condition that a first energy storage subunit exists in the energy storage system 1000, according to the dispatching power and the voltage state of each battery cluster 10 of each energy storage subunit 100, the charging and discharging power of each energy storage subunit 100 is automatically controlled so as to reduce the voltage difference of each battery cluster 10 under the same energy storage subunit 100, and the abnormal battery clusters are not required to be processed additionally and specially, so that independent processing can be completed in the normal response dispatching process of the energy storage system 1000, all the battery clusters are ensured to be charged and discharged normally as much as possible, and the purposes of increasing the available power rate of the energy storage system 1000 and preventing the abnormal battery clusters from being charged and discharged for a long time to cause undervoltage are achieved.
In some embodiments, the scheduling power is a charging power, and step 02 (adjusting the operating power of the abnormal battery cluster and the operating power of the second energy storage subunit according to the scheduling power so that the voltage difference between the abnormal battery cluster and the normal battery cluster is less than a preset voltage difference) includes:
021: when the maximum chargeable power of the abnormal battery cluster is larger than the dispatching power and the voltage of the abnormal battery cluster is smaller than the voltage of the normal battery cluster, adjusting the charging power of the abnormal battery cluster to be the dispatching power, and adjusting the charging power of the second energy storage subunit to be zero so as to increase the voltage of the abnormal battery cluster, so that the voltage difference between the abnormal battery cluster and the normal battery cluster is smaller than the preset voltage difference.
In this way, the charging power of the abnormal battery cluster is adjusted to be the dispatching power, the charging power of the second energy storage subunit is adjusted to be zero, and the voltage difference between the abnormal battery cluster and the normal battery cluster is smaller than the preset voltage difference on the premise of meeting the dispatching power.
Specifically, the scheduled power Px is charging power, that is, the energy storage system 1000 is controlled to be charged by the scheduled power Px. Determining whether the maximum chargeable power Pu of the abnormal battery cluster is larger than the scheduling power Px, and determining that the abnormal battery cluster can meet the scheduling power Px under the condition that the maximum chargeable power Pu of the abnormal battery cluster is larger than the scheduling power Px. When the voltage of the abnormal battery cluster is smaller than that of the normal battery cluster, the abnormal battery cluster can be closed, the scheduling power Px is sent to the first energy storage subunit, so that the charging power of the abnormal battery cluster is the scheduling power Px, the voltage of the abnormal battery cluster is increased, and the voltage difference between the abnormal battery cluster and the normal battery cluster is smaller than a preset voltage difference. Since the abnormal battery cluster can already meet the scheduled power Px, zero power can be issued to the second energy storage subunit, so that the charging power of the second energy storage subunit is zero.
In some embodiments, the scheduling power is a charging power, and step 02 (adjusting the operating power of the abnormal battery cluster and the operating power of the second energy storage subunit according to the scheduling power so that the voltage difference between the abnormal battery cluster and the normal battery cluster is less than a preset voltage difference) includes:
022: when the maximum chargeable power of the abnormal battery cluster is smaller than the dispatching power and the voltage of the abnormal battery cluster is smaller than the voltage of the normal battery cluster, adjusting the chargeable power of the abnormal battery cluster to be the maximum chargeable power, and adjusting the chargeable power of the second energy storage subunit to be the difference value between the dispatching power and the maximum chargeable power so as to increase the voltage of the abnormal battery cluster, so that the voltage difference between the abnormal battery cluster and the normal battery cluster is smaller than the preset voltage difference.
In this way, the charging power of the abnormal battery cluster is adjusted to be the maximum chargeable power, the charging power of the second energy storage subunit is adjusted to be the difference value between the dispatching power and the maximum chargeable power, and the voltage difference between the abnormal battery cluster and the normal battery cluster is smaller than the preset voltage difference on the premise of meeting the dispatching power.
Specifically, the scheduled power Px is charging power, that is, the energy storage system 1000 is controlled to be charged by the scheduled power Px. Determining whether the maximum chargeable power Pu of the abnormal battery cluster is larger than the scheduling power Px, and determining that the abnormal battery cluster cannot meet the scheduling power Px under the condition that the maximum chargeable power Pu of the abnormal battery cluster is smaller than the scheduling power Px. When the voltage of the abnormal battery cluster is smaller than that of the normal battery cluster, the abnormal battery cluster can be closed, and the maximum chargeable power Pu of the abnormal battery cluster is sent to the first energy storage subunit, so that the chargeable power Pu of the abnormal battery cluster is the maximum chargeable power Pu, the voltage of the abnormal battery cluster is increased, and the voltage difference between the abnormal battery cluster and the normal battery cluster is smaller than a preset voltage difference. Since the abnormal battery cluster cannot meet the schedule power Px, the second energy storage unit may be closed (all battery clusters 100 in all second energy storage subunits are closed), and the difference between the schedule power Px and the maximum chargeable power Pu is issued to the second energy storage subunit, so that the charging power of the second energy storage subunit is the difference between the schedule power Px and the maximum chargeable power Pu.
In some embodiments, the scheduling power is a charging power, and step 02 (adjusting the operating power of the abnormal battery cluster and the operating power of the second energy storage subunit according to the scheduling power so that the voltage difference between the abnormal battery cluster and the normal battery cluster is less than a preset voltage difference) includes:
023: and when the chargeable total power of all the second energy storage subunits is larger than the dispatching power and the voltage of the abnormal battery cluster is larger than the voltage of the normal battery cluster, adjusting the chargeable power of the second energy storage subunits to be chargeable total power, and adjusting the discharging power of the abnormal battery cluster to be the difference value between the chargeable total power and the dispatching power so as to reduce the voltage of the abnormal battery cluster, so that the voltage difference between the abnormal battery cluster and the normal battery cluster is smaller than the preset voltage difference.
In this way, the charging power of the second energy storage subunit is adjusted to be the chargeable total power, the discharging power of the abnormal battery cluster is adjusted to be the difference value between the chargeable total power and the dispatching power, and the voltage difference between the abnormal battery cluster and the normal battery cluster is smaller than the preset voltage difference on the premise of meeting the dispatching power.
Specifically, the scheduled power Px is charging power, that is, the energy storage system 1000 is controlled to be charged by the scheduled power Px. Determining whether the chargeable total power Py of all the second energy storage subunits is greater than the scheduling power Px, and determining that the second energy storage subunits can meet the scheduling power Px if the chargeable total power Py of all the second energy storage subunits is greater than the scheduling power Px. When the voltage of the abnormal battery cluster is greater than that of the normal battery cluster, the second energy storage unit can be closed, and the chargeable total power Py is sent to the second energy storage subunit, so that the chargeable power of the second energy storage subunit is the chargeable total power Py. Because the second energy storage subunit can meet the dispatching power Px, the abnormal battery cluster can be closed, and the difference value between the chargeable total power Py and the dispatching power Px is issued to the first energy storage subunit, so that the discharging power of the abnormal battery cluster is the difference value between the chargeable total power Py and the dispatching power Px, which is equivalent to charging the second energy storage subunit by using the abnormal battery cluster, so as to reduce the voltage of the abnormal battery cluster, and the voltage difference between the abnormal battery cluster and the normal battery cluster is smaller than the preset voltage difference.
In certain embodiments, the control method further comprises:
03: and when the chargeable total power of all the second energy storage subunits is smaller than the dispatching power, adjusting the working power of the normal battery cluster and the working power of the second energy storage subunits according to the dispatching power.
Thus, when the second energy storage subunit cannot meet the dispatching power, the working power of the normal battery cluster and the working power of the second energy storage subunit can be adjusted to meet the dispatching power.
In particular, in case the chargeable total power Py of all the second energy storage subunits is smaller than the scheduling power Px, it is determined that the second energy storage subunits cannot meet the scheduling power Px. Therefore, the normal battery cluster and the second energy storage subunit can be closed, and the charging power of the normal battery cluster and the charging power of the second energy storage subunit are adjusted according to the dispatching power, so that the charging power of the normal battery cluster and the charging power of the second energy storage subunit can meet the dispatching power Px.
In some embodiments, the scheduling power is a discharging power, and step 02 (adjusting the operating power of the abnormal battery cluster and the operating power of the second energy storage subunit according to the scheduling power so that the voltage difference between the abnormal battery cluster and the normal battery cluster is smaller than a preset voltage difference) includes:
024: when the total dischargeable power of all the second energy storage subunits is larger than the dispatching power and the voltage of the abnormal battery cluster is smaller than the voltage of the normal battery cluster, the discharging power of the second energy storage subunits is adjusted to be the total dischargeable power, the charging power of the abnormal battery cluster is adjusted to be the difference value between the total dischargeable power and the dispatching power, and the voltage of the abnormal battery cluster is increased, so that the voltage difference between the abnormal battery cluster and the normal battery cluster is smaller than the preset voltage difference.
In this way, the discharging power of the second energy storage subunit is adjusted to be the total dischargeable power, the charging power of the abnormal battery cluster is adjusted to be the difference value between the total dischargeable power and the dispatching power, and the voltage difference between the abnormal battery cluster and the normal battery cluster is smaller than the preset voltage difference on the premise of meeting the dispatching power.
Specifically, the scheduled power Px is a discharge power, that is, the energy storage system 1000 is controlled to discharge by using the scheduled power Px. Determining whether the total dischargeable power Py of all the second energy storage subunits is greater than the scheduled power Px, and determining that the second energy storage subunits can meet the scheduled power Px when the total dischargeable power Py of all the second energy storage subunits is greater than the scheduled power Px. When the voltage of the abnormal battery cluster is smaller than that of the normal battery cluster, the second energy storage unit can be closed, and the dischargeable total power Py is sent to the second energy storage subunit, so that the discharge power of the second energy storage subunit is the dischargeable total power Py. Because the second energy storage subunit can meet the dispatching power Px, the abnormal battery cluster can be closed, and the difference value between the dischargeable total power Py and the dispatching power Px is issued to the first energy storage subunit, so that the charging power of the abnormal battery cluster is the difference value between the dischargeable total power Py and the dispatching power Px, which is equivalent to charging the abnormal battery cluster by using the second energy storage subunit, so as to increase the voltage of the abnormal battery cluster, and the voltage difference between the abnormal battery cluster and the normal battery cluster is smaller than the preset voltage difference.
In certain embodiments, the control method further comprises:
04: and when the total dischargeable power of all the second energy storage subunits is smaller than the scheduling power, adjusting the working power of the normal battery cluster and the working power of the second energy storage subunits according to the scheduling power.
Thus, when the second energy storage subunit cannot meet the dispatching power, the working power of the normal battery cluster and the working power of the second energy storage subunit can be adjusted to meet the dispatching power.
In particular, in case the total dischargeable power Py of all the second energy storage subunits is smaller than the scheduling power Px, it is determined that the second energy storage subunits cannot meet the scheduling power Px. Therefore, the normal battery cluster and the second energy storage subunit can be closed, and the discharge power of the normal battery cluster and the discharge power of the second energy storage subunit are regulated according to the scheduling power, so that the discharge power of the normal battery cluster and the discharge power of the second energy storage subunit can meet the scheduling power Px.
In some embodiments, the scheduling power is a discharging power, and step 02 (adjusting the operating power of the abnormal battery cluster and the operating power of the second energy storage subunit according to the scheduling power so that the voltage difference between the abnormal battery cluster and the normal battery cluster is smaller than a preset voltage difference) includes:
025: when the maximum dischargeable power of the abnormal battery cluster is larger than the dispatching power and the voltage of the abnormal battery cluster is larger than the voltage of the normal battery cluster, the discharging power of the abnormal battery cluster is regulated to be the dispatching power, and the discharging power of the second energy storage subunit is regulated to be zero so as to reduce the voltage of the abnormal battery cluster, so that the voltage difference between the abnormal battery cluster and the normal battery cluster is smaller than the preset voltage difference.
In this way, the discharging power of the abnormal battery cluster is adjusted to be the dispatching power, the discharging power of the second energy storage subunit is adjusted to be zero, and the voltage difference between the abnormal battery cluster and the normal battery cluster is smaller than the preset voltage difference on the premise of meeting the dispatching power.
Specifically, the scheduled power Px is a discharge power, that is, the energy storage system 1000 is controlled to discharge by using the scheduled power Px. Determining whether the maximum dischargeable power Pu of the abnormal battery cluster is greater than the scheduling power Px, and determining that the abnormal battery cluster can meet the scheduling power Px when the maximum dischargeable power Pu of the abnormal battery cluster is greater than the scheduling power Px. When the voltage of the abnormal battery cluster is larger than that of the normal battery cluster, the abnormal battery cluster can be closed, the scheduling power Px is sent to the first energy storage subunit, so that the discharging power of the abnormal battery cluster is the scheduling power Px, the voltage of the abnormal battery cluster is reduced, and the voltage difference between the abnormal battery cluster and the normal battery cluster is smaller than the preset voltage difference. Since the abnormal battery cluster can already meet the scheduled power Px, zero power can be issued to the second energy storage subunit, so that the discharge power of the second energy storage subunit is zero.
In some embodiments, the scheduling power is a discharging power, and step 02 (adjusting the operating power of the abnormal battery cluster and the operating power of the second energy storage subunit according to the scheduling power so that the voltage difference between the abnormal battery cluster and the normal battery cluster is smaller than a preset voltage difference) includes:
026: when the maximum dischargeable power of the abnormal battery cluster is smaller than the dispatching power and the voltage of the abnormal battery cluster is larger than the voltage of the normal battery cluster, the discharging power of the abnormal battery cluster is adjusted to be the maximum dischargeable power of the abnormal battery cluster, and the discharging power of the second energy storage subunit is adjusted to be the difference value between the dispatching power and the maximum dischargeable power so as to reduce the voltage of the abnormal battery cluster, so that the voltage difference between the abnormal battery cluster and the normal battery cluster is smaller than the preset voltage difference.
In this way, the discharging power of the abnormal battery cluster is adjusted to be the maximum dischargeable power of the abnormal battery cluster, the discharging power of the second energy storage subunit is adjusted to be the difference value between the dispatching power and the maximum dischargeable power, and the voltage difference between the abnormal battery cluster and the normal battery cluster is smaller than the preset voltage difference on the premise that the dispatching power is met.
Specifically, the scheduled power Px is a discharge power, that is, the energy storage system 1000 is controlled to discharge by using the scheduled power Px. Determining whether the maximum dischargeable power Pu of the abnormal battery cluster is greater than the scheduling power Px, and determining that the abnormal battery cluster cannot meet the scheduling power Px when the maximum dischargeable power Pu of the abnormal battery cluster is less than the scheduling power Px. When the voltage of the abnormal battery cluster is larger than that of the normal battery cluster, the abnormal battery cluster can be closed, and the maximum dischargeable power Pu of the abnormal battery cluster is sent to the first energy storage subunit, so that the discharge power of the abnormal battery cluster is the maximum dischargeable power Pu, the voltage of the abnormal battery cluster is reduced, and the voltage difference between the abnormal battery cluster and the normal battery cluster is smaller than the preset voltage difference. Because the abnormal battery cluster cannot meet the scheduling power Px, the second energy storage unit can be closed, and the difference value between the scheduling power Px and the maximum dischargeable power Pu is issued to the second energy storage subunit, so that the discharging power of the second energy storage subunit is the difference value between the scheduling power Px and the maximum dischargeable power Pu.
Under the condition that the voltage difference between the abnormal battery cluster and the normal battery cluster is smaller than the preset voltage difference, the first energy storage subunit can be converted into the second energy storage subunit. Under the condition that the first energy storage subunit is converted into the second energy storage subunit, after the first energy storage subunit can stop working, all the battery clusters 10 are closed, and the energy storage system 1000 redistributes the scheduling power according to all the energy storage subunits 100, so that the abnormal battery clusters with the original voltage difference larger than the preset voltage difference can normally participate in charging and discharging.
In the case that the plurality of energy storage subunits 100 are all second energy storage subunits, all battery clusters 100 in all energy storage subunits 100 can be normally closed, and the working power of each energy storage subunit 100 can be adjusted according to the scheduling power, so that the charging and discharging power of all battery clusters 10 can meet the scheduling power Px.
An embodiment of the present invention provides a controller including one or more processors and a memory storing a computer program that, when executed by the processor, implements the steps of the control method of any of the embodiments described above.
In the controller, the working power of the abnormal battery cluster and the working power of the second energy storage subunit are regulated according to the dispatching power, so that the voltage difference between the abnormal battery cluster and the normal battery cluster is reduced, the voltage difference between the abnormal battery cluster and the normal battery cluster is smaller than the preset voltage difference, the abnormal battery cluster can be used normally, the problem of under-voltage of the battery caused by the fact that the abnormal battery cluster is always in a state of being unable to be closed is avoided, and the service life of the battery can be prolonged.
Embodiments of the present invention provide an energy storage system 1000, the energy storage system 1000 comprising a controller and a plurality of energy storage subunits 100 of any of the embodiments described above.
In the energy storage system 1000 of the present invention, the working power of the abnormal battery cluster and the working power of the second energy storage subunit are adjusted according to the scheduled power, so as to reduce the voltage difference between the abnormal battery cluster and the normal battery cluster, and make the voltage difference between the abnormal battery cluster and the normal battery cluster smaller than the preset voltage difference, so that the abnormal battery cluster can be used normally, and the problem of under-voltage of the battery caused by the fact that the abnormal battery cluster is always in a state of being unable to be closed is avoided, and further the service life of the battery can be prolonged.
An embodiment of the present invention provides a computer-readable storage medium having stored thereon a computer program that, when executed by a processor, performs the steps of the control method of any of the above embodiments.
In the computer readable storage medium, the working power of the abnormal battery cluster and the working power of the second energy storage subunit are regulated according to the dispatching power, so that the voltage difference between the abnormal battery cluster and the normal battery cluster is reduced, the voltage difference between the abnormal battery cluster and the normal battery cluster is smaller than the preset voltage difference, the abnormal battery cluster can be used normally, the problem of under-voltage of the battery caused by the fact that the abnormal battery cluster is always in a state of being unable to be closed is avoided, and the service life of the battery can be prolonged.
In the description of the present specification, reference is made to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., meaning that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
Furthermore, the term "coupled" is to be broadly interpreted and includes, for example, either permanently coupled, detachably coupled, or integrally coupled; can include direct connection, indirect connection through intermediate media, and communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and additional implementations are included within the scope of the preferred embodiment of the present invention in which steps may be included other than in the order shown or discussed, including: the functions are performed in a substantially simultaneous manner or in an inverse order, depending on the functions involved, as will be appreciated by those skilled in the art to which embodiments of the present invention pertain.
While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.
Claims (12)
1. A control method for an energy storage system, the energy storage system comprising a plurality of energy storage subunits, each of the energy storage subunits comprising one or more battery clusters, the control method comprising:
determining a first energy storage subunit and a second energy storage subunit in the plurality of energy storage subunits, wherein the first energy storage subunit comprises an abnormal battery cluster and a normal battery cluster, the voltage difference between the abnormal battery cluster and the normal battery cluster is larger than a preset voltage difference, and the second energy storage subunit is other energy storage subunits except the first energy storage subunit in the plurality of energy storage subunits;
and adjusting the working power of the abnormal battery cluster and the working power of the second energy storage subunit according to the dispatching power so that the voltage difference between the abnormal battery cluster and the normal battery cluster is smaller than the preset voltage difference.
2. The control method according to claim 1, wherein the scheduled power is a charging power, and the adjusting the operating power of the abnormal battery cluster and the operating power of the second energy storage subunit according to the scheduled power so that a voltage difference between the abnormal battery cluster and the normal battery cluster is smaller than the preset voltage difference includes:
and when the maximum chargeable power of the abnormal battery cluster is larger than the dispatching power and the voltage of the abnormal battery cluster is smaller than the voltage of the normal battery cluster, adjusting the charging power of the abnormal battery cluster to be the dispatching power, and adjusting the charging power of the second energy storage subunit to be zero so as to increase the voltage of the abnormal battery cluster, so that the voltage difference between the abnormal battery cluster and the normal battery cluster is smaller than the preset voltage difference.
3. The control method according to claim 1, wherein the scheduled power is a charging power, and the adjusting the operating power of the abnormal battery cluster and the operating power of the second energy storage subunit according to the scheduled power so that a voltage difference between the abnormal battery cluster and the normal battery cluster is smaller than the preset voltage difference includes:
and when the maximum chargeable power of the abnormal battery cluster is smaller than the dispatching power and the voltage of the abnormal battery cluster is smaller than the voltage of the normal battery cluster, adjusting the charging power of the abnormal battery cluster to be the maximum chargeable power, and adjusting the charging power of the second energy storage subunit to be the difference value between the dispatching power and the maximum chargeable power so as to increase the voltage of the abnormal battery cluster, so that the voltage difference between the abnormal battery cluster and the normal battery cluster is smaller than the preset voltage difference.
4. The control method according to claim 1, wherein the scheduled power is a charging power, and the adjusting the operating power of the abnormal battery cluster and the operating power of the second energy storage subunit according to the scheduled power so that a voltage difference between the abnormal battery cluster and the normal battery cluster is smaller than the preset voltage difference includes:
and when the chargeable total power of all the second energy storage subunits is larger than the dispatching power and the voltage of the abnormal battery cluster is larger than the voltage of the normal battery cluster, adjusting the chargeable power of the second energy storage subunits to be the chargeable total power, and adjusting the discharging power of the abnormal battery cluster to be the difference value between the chargeable total power and the dispatching power so as to reduce the voltage of the abnormal battery cluster, so that the voltage difference between the abnormal battery cluster and the normal battery cluster is smaller than the preset voltage difference.
5. The control method according to claim 4, characterized in that the control method further comprises:
and when the chargeable total power of all the second energy storage subunits is smaller than the scheduling power, adjusting the working power of the normal battery cluster and the working power of the second energy storage subunits according to the scheduling power.
6. The control method according to claim 1, wherein the scheduled power is a discharge power, and the adjusting the operating power of the abnormal battery cluster and the operating power of the second energy storage subunit according to the scheduled power so that a voltage difference between the abnormal battery cluster and the normal battery cluster is smaller than the preset voltage difference includes:
and when the total dischargeable power of all the second energy storage subunits is larger than the dispatching power and the voltage of the abnormal battery cluster is smaller than the voltage of the normal battery cluster, adjusting the discharging power of the second energy storage subunits to be the total dischargeable power, and adjusting the charging power of the abnormal battery cluster to be the difference value between the total dischargeable power and the dispatching power so as to increase the voltage of the abnormal battery cluster, so that the voltage difference between the abnormal battery cluster and the normal battery cluster is smaller than the preset voltage difference.
7. The control method according to claim 6, characterized in that the control method further comprises:
and when the total dischargeable power of all the second energy storage subunits is smaller than the scheduling power, adjusting the working power of the normal battery cluster and the working power of the second energy storage subunits according to the scheduling power.
8. The control method according to claim 1, wherein the scheduled power is a discharge power, and the adjusting the operating power of the abnormal battery cluster and the operating power of the second energy storage subunit according to the scheduled power so that a voltage difference between the abnormal battery cluster and the normal battery cluster is smaller than the preset voltage difference includes:
when the maximum dischargeable power of the abnormal battery cluster is larger than the scheduling power and the voltage of the abnormal battery cluster is larger than the voltage of the normal battery cluster, adjusting the discharging power of the abnormal battery cluster to be the scheduling power, and adjusting the discharging power of the second energy storage subunit to be zero so as to reduce the voltage of the abnormal battery cluster, so that the voltage difference between the abnormal battery cluster and the normal battery cluster is smaller than the preset voltage difference.
9. The control method according to claim 1, wherein the scheduled power is a discharge power, and the adjusting the operating power of the abnormal battery cluster and the operating power of the second energy storage subunit according to the scheduled power so that a voltage difference between the abnormal battery cluster and the normal battery cluster is smaller than the preset voltage difference includes:
and when the maximum dischargeable power of the abnormal battery cluster is smaller than the scheduling power and the voltage of the abnormal battery cluster is larger than the voltage of the normal battery cluster, adjusting the discharging power of the abnormal battery cluster to be the maximum dischargeable power of the abnormal battery cluster, and adjusting the discharging power of the second energy storage subunit to be the difference value between the scheduling power and the maximum dischargeable power so as to reduce the voltage of the abnormal battery cluster, so that the voltage difference between the abnormal battery cluster and the normal battery cluster is smaller than the preset voltage difference.
10. A controller comprising one or more processors and a memory storing a computer program which, when executed by the processor, implements the steps of the control method of any one of claims 1 to 9.
11. An energy storage system comprising the controller of claim 10 and a plurality of energy storage subunits.
12. A computer-readable storage medium, on which a computer program is stored, characterized in that the program, when being executed by a processor, implements the steps of the control method according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311792721.6A CN117879094A (en) | 2023-12-22 | 2023-12-22 | Control method, controller, energy storage system and computer readable storage medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311792721.6A CN117879094A (en) | 2023-12-22 | 2023-12-22 | Control method, controller, energy storage system and computer readable storage medium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117879094A true CN117879094A (en) | 2024-04-12 |
Family
ID=90578447
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311792721.6A Pending CN117879094A (en) | 2023-12-22 | 2023-12-22 | Control method, controller, energy storage system and computer readable storage medium |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117879094A (en) |
-
2023
- 2023-12-22 CN CN202311792721.6A patent/CN117879094A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR102110799B1 (en) | Terminal and device | |
| EP1733579B1 (en) | Adaptive power management for a node of a mobile telecommunications network | |
| CN111293712B (en) | Network load storage demand response control system and control method | |
| US9093859B2 (en) | DC power system having a power architecture for optimizing efficiency and a system controller of the system | |
| US11575262B2 (en) | Priority load sharing for electrical power systems having multiple power sources | |
| CN113224813B (en) | Off-grid photovoltaic energy storage system control method and device, computer and storage medium | |
| CN117117936A (en) | Energy storage system and control method thereof | |
| US20100312411A1 (en) | Ac consumption controller, method of managing ac power consumption and a battery plant employing the same | |
| CN115986883A (en) | Energy storage system and control method thereof | |
| CN117879094A (en) | Control method, controller, energy storage system and computer readable storage medium | |
| KR101977165B1 (en) | System and method for controlling ess for emergency power source, and a recording medium having computer readable program for executing the method | |
| JP5059674B2 (en) | Power supply system and charging method | |
| JP6865651B2 (en) | Distributed power system | |
| KR20170036328A (en) | Uninterruptible power supply | |
| JP2002315224A (en) | Fuel battery power source system and method for charging secondary cell in the fuel battery power source system | |
| CN110620426A (en) | Power supply switching device and method | |
| KR20160075999A (en) | System and Method for Complementary Power Control in Bipolar DC distribution system | |
| EP4142106A1 (en) | Power conversion system | |
| JP7446141B2 (en) | Energy systems and how they operate | |
| CN110707679B (en) | Voltage control method and photovoltaic power supply device and system | |
| WO2024077882A1 (en) | Method, system and device for controlling charging at battery swapping station, and storage medium | |
| CN117477701A (en) | Balanced control system and method for battery cluster, energy storage system, chip and medium | |
| CN114928139A (en) | Lithium battery charging method, system and device and computer readable storage medium | |
| CN114243837A (en) | Deep fusion breaker capacitor electricity taking and power supply system, control method and control device | |
| CN114123426A (en) | Charging system of battery replacement station |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination |