Intelligent management and control method and device of distributed energy storage PCS, and computer storage medium

Abstract

The application discloses an intelligent management and control method and device for a distributed energy storage PCS, and a computer storage medium, and the method comprises the following steps: determining the cell information of all cells in an energy storage system and the configuration information of the energy storage PCS; dividing and configuring all cells according to the cell information of all cells and the configuration information, in combination with the corresponding management and control requirements of the energy storage system, to obtain a plurality of power units, each power unit comprising a preset number of cells and at least one energy storage PCS for managing and controlling all cells; determining the current unit state of each power unit and the corresponding management and control requirements; performing a preset unit management and control operation on each power unit according to the corresponding unit state and the corresponding management and control requirements of each power unit; and the preset unit management and control operation comprises an electric parameter adjustment and / or on-off control between the power units. It can be seen that the application can reduce the management and control difficulty of the multi-cell series connection and improve the system availability.

Description

Technical Field

[0001] This invention relates to the field of energy storage data management and control technology, and in particular to an intelligent management and control method and device for distributed energy storage PCS. Background Technology

[0002] Existing PCS systems operate using single units or parallel modules. To achieve the voltage required for grid connection, the front-end batteries must use multiple cells connected in series, which places high demands on the consistency of the series-connected cells. In other words, managing a large number of series-connected cells is very difficult in existing technologies.

[0003] Furthermore, since multiple cells operate in series, a failure in any one cell will render the entire string inoperable, resulting in low system availability. Therefore, providing a method to address the high management difficulty of multi-cell series operation while simultaneously improving system availability is of paramount importance. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide an intelligent management and control method and device for distributed energy storage PCS, which can solve the problem of high management and control difficulty when multiple cells are connected in series, and at the same time improve system availability.

[0005] To address the aforementioned technical problems, the first aspect of this invention discloses an intelligent management and control method for distributed energy storage systems (PCS), the method comprising:

[0006] Determine the cell information of all cells in the energy storage system and the configuration information of the energy storage PCS. The cell information of all cells includes the total number of cells and the adapted voltage of each cell.

[0007] Based on the cell information and configuration information of all the cells, and combined with the control requirements of the energy storage system, all the cells are divided and configured to obtain multiple power units. Each power unit includes a preset number of cells and at least one energy storage PCS for controlling all the cells.

[0008] Determine the current unit state of each power unit and the corresponding control requirements for the unit state. The unit state includes a charging state where a charging operation is performed on the power unit or a discharging state where a discharging operation is performed on the power unit.

[0009] Based on the unit state corresponding to each power unit and the control requirements corresponding to that unit state, a preset unit control operation is performed on each power unit; the preset unit control operation includes electrical parameter adjustment and / or on / off control between power units.

[0010] As an optional implementation, in the first aspect of the present invention, determining the current unit state of each power unit and the control requirements corresponding to the unit state includes:

[0011] For each power unit, the target capacity of the power unit and the interaction state of the energy storage PCS corresponding to the power unit are detected; the target capacity includes the total cell capacity and / or average cell capacity of all cells in the power unit; the interaction state includes rectification state or inverter state.

[0012] When the energy storage PCS corresponding to any of the power units is in the rectification state, and the target capacity of the power unit is within the first capacity range corresponding to the rectification state, the current unit state of the power unit is determined to be the charging state, and the control requirements corresponding to the charging state are determined to be rectification requirements and buck requirements.

[0013] When the energy storage PCS corresponding to any of the power units is in the inverter state, and the target capacity of the power unit is within the second capacity range corresponding to the inverter state, the current unit state of the power unit is determined to be the discharge state, and the control requirements corresponding to the discharge state are determined to be inverter requirements and boost requirements.

[0014] As an optional implementation, in a first aspect of the invention, the rectification requirement is used to instruct the AC power input to the energy storage PCS to be rectified into DC power.

[0015] The inverter requirement is used to invert the DC power input to the energy storage PCS into AC power.

[0016] As an optional implementation, in a first aspect of the invention, each of the energy storage PCS includes a first component for performing DC to AC conversion operations and a second component for performing voltage boosting operations.

[0017] The step of performing a preset unit control operation on each power unit according to the unit state corresponding to each power unit and the control requirements corresponding to that unit state includes:

[0018] For each power unit, according to the current interaction state of the energy storage PCS corresponding to the power unit, the operating mode of the first component in the power unit is switched, and the first component performs an AC-DC conversion operation on the target voltage flowing through the first component to obtain the AC-DC conversion voltage corresponding to the target voltage;

[0019] By combining the second component with the preset voltage conversion requirements, the voltage value corresponding to the AC-DC conversion voltage is adjusted to the target voltage range that matches the current interaction state of the energy storage PCS.

[0020] As an optional implementation, in the first aspect of the present invention, when the current interaction state of the energy storage PCS is the rectification state, after the target voltage flowing through the energy storage PCS performs the AC-DC conversion operation, the corresponding AC-DC conversion voltage obtained is a DC voltage:

[0021] When the current interaction state of the energy storage PCS is the inverter state, the target voltage flowing through the energy storage PCS undergoes the AC-DC conversion operation, and the corresponding AC-DC conversion voltage is an AC voltage.

[0022] The first component is specifically a DC / AC converter, and the second component is specifically a DC / DC converter.

[0023] As an optional implementation, in the first aspect of the present invention, the operating data of each power unit is collected in real time to obtain the operating status of each power unit, the operating status including a fault status indicating that the power unit has failed or a normal status opposite to the fault status;

[0024] When a target power unit in the fault state is detected among all the power units, the interaction line between the target power unit and the other power units is determined.

[0025] According to the interaction line, other power units are controlled to disconnect their switching lines from the target power unit, and fault information for the target power unit is generated. The fault information is fed back to the personnel responsible for processing the fault information, so that the personnel can perform preset fault handling operations on the target power unit according to the fault information.

[0026] As an optional implementation, in the first aspect of the present invention, each of the power units is disposed in a preset distribution level, and the higher the distribution level, the more power units are controlled.

[0027] Before generating fault information for the target power unit, the method further includes:

[0028] Based on the interaction line, a target affected unit that is affected by the fault state corresponding to the target power unit is determined from all other power units. The target affected unit includes peer units, subordinate units, and superior units.

[0029] Select a backup unit from all peer units that is in the fault state of the target power unit; update the target power unit to the backup unit, and trigger the generation of fault information for the target power unit.

[0030] The peer unit is a unit that is in the same distribution level as the target power unit, and the distribution levels of the superior unit, the peer unit, and the subordinate unit decrease in that order.

[0031] A second aspect of this invention discloses an intelligent control device for a distributed energy storage system (PCS), the device comprising:

[0032] The determination module is used to determine the cell information of all cells in the energy storage system and the configuration information of the energy storage PCS. The cell information of all cells includes the total number of cells and the adapted voltage of each cell.

[0033] The partitioning and configuration module is used to partition and configure all the battery cells according to the cell information and configuration information of all the battery cells, combined with the control requirements of the energy storage system, to obtain multiple power units. Each power unit includes a preset number of battery cells and at least one energy storage PCS for controlling all the battery cells.

[0034] The determining module is further configured to determine the current unit state of each power unit and the control requirements corresponding to the unit state. The unit state includes a charging state in which a charging operation is performed on the power unit or a discharging state in which a discharging operation is performed on the power unit.

[0035] The control module is used to perform preset unit control operations on each power unit according to the unit state corresponding to each power unit and the control requirements corresponding to the unit state; the preset unit control operations include electrical parameter adjustment and / or on / off control between power units.

[0036] As an optional implementation, in the second aspect of the present invention, the method by which the determining module determines the current unit state of each power unit and the control requirements corresponding to the unit state specifically includes:

[0037] For each power unit, the target capacity of the power unit and the interaction state of the energy storage PCS corresponding to the power unit are detected; the target capacity includes the total cell capacity and / or average cell capacity of all cells in the power unit; the interaction state includes rectification state or inverter state.

[0038] When the energy storage PCS corresponding to any of the power units is in the rectification state, and the target capacity of the power unit is within the first capacity range corresponding to the rectification state, the current unit state of the power unit is determined to be the charging state, and the control requirements corresponding to the charging state are determined to be rectification requirements and buck requirements.

[0039] When the energy storage PCS corresponding to any of the power units is in the inverter state, and the target capacity of the power unit is within the second capacity range corresponding to the inverter state, the current unit state of the power unit is determined to be the discharge state, and the control requirements corresponding to the discharge state are determined to be inverter requirements and boost requirements.

[0040] As an optional implementation, in a second aspect of the invention, the rectification requirement is used to indicate that the AC power input to the energy storage PCS is rectified into DC power.

[0041] The inverter requirement is used to invert the DC power input to the energy storage PCS into AC power.

[0042] As an optional implementation, in a second aspect of the invention, each of the energy storage PCS includes a first component for performing DC to AC conversion operations and a second component for performing voltage boosting operations.

[0043] The control module performs preset unit control operations on each power unit according to the unit state and the control requirements corresponding to that unit state. Specifically, this includes:

[0044] For each power unit, according to the current interaction state of the energy storage PCS corresponding to the power unit, the operating mode of the first component in the power unit is switched, and the first component performs an AC-DC conversion operation on the target voltage flowing through the first component to obtain the AC-DC conversion voltage corresponding to the target voltage;

[0045] By combining the second component with the preset voltage conversion requirements, the voltage value corresponding to the AC-DC conversion voltage is adjusted to the target voltage range that matches the current interaction state of the energy storage PCS.

[0046] As an optional implementation, in a second aspect of the present invention, when the current interaction state of the energy storage PCS is the rectification state, after the target voltage flowing through the energy storage PCS performs the AC-DC conversion operation, the corresponding AC-DC conversion voltage obtained is a DC voltage:

[0047] When the current interaction state of the energy storage PCS is the inverter state, the target voltage flowing through the energy storage PCS undergoes the AC-DC conversion operation, and the corresponding AC-DC conversion voltage is an AC voltage.

[0048] The first component is specifically a DC / AC converter, and the second component is specifically a DC / DC converter.

[0049] As an optional implementation, in a second aspect of the invention, the apparatus further includes:

[0050] The acquisition module is used to acquire the operating data of each power unit in real time to obtain the operating status of each power unit. The operating status includes a fault status indicating that the power unit has failed or a normal status that is the opposite of the fault status.

[0051] The determining module is further configured to determine the interaction line between the target power unit and other power units when a target power unit in the fault state is detected among all the power units;

[0052] The control module is used to control other power units to disconnect their switching lines from the target power unit based on the interaction line.

[0053] The generation module is used to generate fault information for the target power unit. The fault information is used to feed back to the personnel responsible for processing the fault information, so that the personnel can perform preset fault handling operations on the target power unit according to the fault information.

[0054] As an optional implementation, in a second aspect of the present invention, each of the power units is disposed in a preset distribution hierarchy, and the higher the distribution hierarchy, the more power units are controlled.

[0055] The determining module is further configured to, before the generating module generates fault information for the target power unit, determine, from all other power units, a target affected unit that is affected by the fault state corresponding to the target power unit, based on the interaction line. The target affected unit includes peer units, subordinate units, and superior units.

[0056] The device further includes:

[0057] The filtering and updating module is used to filter out the backup units that are in the fault state of the target power unit from all the peer units; update the target power unit to the backup unit, and trigger the generation module to generate fault information for the target power unit.

[0058] The peer unit is a unit that is in the same distribution level as the target power unit, and the distribution levels of the superior unit, the peer unit, and the subordinate unit decrease in that order.

[0059] A third aspect of this invention discloses another intelligent management and control device for distributed energy storage PCS, the device comprising:

[0060] Memory containing executable program code;

[0061] A processor coupled to the memory;

[0062] The processor calls the executable program code stored in the memory to execute the intelligent management and control method for distributed energy storage PCS disclosed in the first aspect of the present invention.

[0063] The fourth aspect of the present invention discloses a computer storage medium storing computer instructions, which, when invoked, are used to execute the intelligent control method for distributed energy storage PCS disclosed in the first aspect of the present invention.

[0064] Compared with the prior art, the embodiments of the present invention have the following beneficial effects:

[0065] This invention provides an intelligent management and control method for a distributed energy storage PCS. The method includes: determining the cell information of all cells in the energy storage system and the configuration information of the energy storage PCS; the cell information includes the total number of cells and the adapted voltage of each cell; based on the cell information and configuration information, and combined with the management and control requirements of the energy storage system, dividing and configuring all cells to obtain multiple power units, each power unit including a preset number of cells and at least one energy storage PCS for managing all cells; determining the current unit state of each power unit and the corresponding management and control requirements; the unit state includes a charging state (performing a charging operation on the power unit) or a discharging state (performing a discharging operation on the power unit); and performing preset unit management and control operations on each power unit according to its corresponding unit state and the management and control requirements; the preset unit management and control operations include electrical parameter adjustment and / or on / off control between power units. As can be seen, implementing this invention can automatically determine the cell information of all cells in the energy storage system and the configuration information of the energy storage PCS. Then, combined with the management and control requirements of the energy storage system, all cells are divided into multiple power units. Then, combined with the power status and management and control requirements of each power unit, preset unit management and control operations are performed on each power unit. Compared with the traditional management and control method of all series-connected cells, the management and control of the power unit as a whole reduces the difficulty of adjusting the voltage consistency of all series-connected cells. On the other hand, the multi-cell management and control method of the power unit as a whole reduces the management and control difficulty of all cells, and also improves the availability of the system corresponding to the power unit. Attached Figure Description

[0066] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0067] Figure 1 This is a flowchart illustrating an intelligent management and control method for a distributed energy storage PCS disclosed in an embodiment of the present invention.

[0068] Figure 2 This is a flowchart illustrating another intelligent management and control method for distributed energy storage PCS disclosed in an embodiment of the present invention.

[0069] Figure 3 This is a schematic diagram of the structure of an intelligent control device for a distributed energy storage PCS disclosed in an embodiment of the present invention;

[0070] Figure 4 This is a schematic diagram of the structure of another intelligent control device for distributed energy storage PCS disclosed in an embodiment of the present invention.

[0071] Figure 5 This is a schematic diagram of the structure of another intelligent control device for distributed energy storage PCS disclosed in the embodiments of the present invention. Detailed Implementation

[0072] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0073] The terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this invention are used to distinguish different objects, not to describe a specific order. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, apparatus, product, or end that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or ends.

[0074] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the invention. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0075] This invention discloses an intelligent management and control method and device for distributed energy storage PCS. It can automatically determine the cell information of all cells in the energy storage system and the configuration information of the energy storage PCS. Then, based on the management and control requirements of the energy storage system, it divides all cells into multiple power units. Furthermore, based on the power status and management requirements of each power unit, it executes preset unit management operations on each power unit. Compared to the traditional management method of all series-connected cells, this management based on the power unit as a whole reduces the difficulty of adjusting the voltage consistency of all series-connected cells. Moreover, this multi-cell management method based on the power unit as a whole reduces the management difficulty of all cells and improves the availability of the system corresponding to that power unit. Detailed descriptions follow.

[0076] Example 1

[0077] Please see Figure 1 , Figure 1 This is a flowchart illustrating an intelligent management and control method for a distributed energy storage PCS disclosed in an embodiment of the present invention. Wherein, Figure 1 The described intelligent management and control method for distributed energy storage PCS can be applied to intelligent management and control devices for distributed energy storage PCS, and the embodiments of the present invention are not limited thereto. Figure 1 As shown, the intelligent management and control method for this distributed energy storage PCS can include the following operations:

[0078] 101. Determine the cell information of all cells in the energy storage system and the configuration information of the energy storage PCS. The cell information of all cells includes the total number of cells and the appropriate voltage of each cell.

[0079] In this embodiment of the invention, the configuration information of the energy storage PCS includes the number of energy storage PCS in the energy storage system.

[0080] 102. Based on the cell information and configuration information of all cells, and combined with the corresponding management and control requirements of the energy storage system, all cells are divided and configured to obtain multiple power units.

[0081] In this embodiment of the invention, each power unit includes a preset number of battery cells and at least one energy storage PCS for managing all battery cells. For each power unit, the battery cells can be divided and configured according to actual usage requirements. For example, power unit A includes one energy storage PCS that manages 20 battery cells connected in series; power unit B may include two energy storage PCS, which are connected in series or in parallel to jointly manage 60 battery cells. The 60 battery cells are connected in a series-parallel interactive manner. The specific number of battery cells included in a single power unit, the connection method between all battery cells, the number of energy storage PCS, and the connection method between energy storage PCS are not limited in this embodiment of the invention.

[0082] In this embodiment of the invention, in practical applications, any power unit is connected in series or in parallel with at least one other power unit, and all power units are distributed throughout the energy storage system. On the one hand, this allows for fault isolation, ensuring that a fault in a single power unit does not affect the normal operation of other power units; on the other hand, it facilitates heat dissipation, reducing the volume and footprint of the entire energy storage system.

[0083] In this embodiment of the invention, optionally, different power units can be managed by the same energy storage PCS, but this embodiment of the invention does not impose any limitations.

[0084] 103. Determine the current unit status of each power unit and the corresponding control requirements for that unit status.

[0085] In this embodiment of the invention, the unit state includes a charging state in which a charging operation is performed on the power unit or a discharging state in which a discharging operation is performed on the power unit.

[0086] 104. Based on the unit status corresponding to each power unit and the control requirements corresponding to that unit status, perform preset unit control operations on each power unit.

[0087] In this embodiment of the invention, the preset unit control operation includes electrical parameter adjustment and / or on / off control between power units.

[0088] In this embodiment of the invention, the electrical parameter adjustment is mainly used to adjust the voltage output and voltage input of each power unit. Specifically, it can be further subdivided into controlling the voltage output and voltage input of each cell in the power unit, etc. This embodiment of the invention does not limit this.

[0089] In this embodiment of the invention, the battery voltage of a single power unit can be designed between 10-100V, and the output power is adaptively adjusted according to the combined capacity / cell data of all cells.

[0090] It is evident that implementation Figure 1 The described intelligent management and control method for distributed energy storage PCS can automatically determine the cell information of all cells in the energy storage system and the configuration information of the energy storage PCS. Then, combined with the management and control requirements of the energy storage system, all cells are divided into multiple power units. Based on the power status and management and control requirements of each power unit, preset unit management and control operations are performed on each power unit. Compared with the traditional management and control method for all series-connected cells, the management and control based on the power unit as a whole reduces the difficulty of adjusting the voltage consistency of all series-connected cells. On the other hand, the multi-cell management and control method based on the power unit as a whole reduces the management and control difficulty of all cells and improves the availability of the system corresponding to the power unit.

[0091] In an optional embodiment, step 103, determining the current cell state of each power unit and the corresponding control requirements, specifically includes:

[0092] For each power unit, the target capacity of the power unit and the interaction state of the corresponding energy storage PCS are detected; the target capacity includes the total cell capacity and / or average cell capacity of all cells in the power unit; the interaction state includes rectification state or inverter state.

[0093] When the energy storage PCS corresponding to any power unit is in rectification mode, and the target capacity of the power unit is within the first capacity range corresponding to the rectification mode, the current unit state of the power unit is determined to be charging mode, and the control requirements corresponding to the charging mode are determined to be rectification requirement and buck requirement.

[0094] When the energy storage PCS corresponding to any power unit is in the inverter state, and the target capacity of the power unit is within the second capacity range corresponding to the inverter state, the current unit state of the power unit is determined to be the discharge state, and the control requirements corresponding to the discharge state are determined to be the inverter requirement and the boost requirement.

[0095] In this optional embodiment, specifically, when the energy storage PCS corresponding to the power unit is in rectification mode, it is initially determined that a charging operation needs to be performed on the cells in the power unit. Further, it is determined whether the target capacity of the power unit is within the first capacity range (e.g., the total cell capacity is within the range of 0-80%), and the power unit is determined to be in charging mode. Similarly, when the energy storage PCS corresponding to the power unit is in inverter mode, it can be determined whether the target capacity of the power unit is within the second capacity range (e.g., the total cell capacity is within the range of 30-100%). If so, the power unit is determined to be in discharging mode.

[0096] In this optional embodiment, when the power unit is in a charging or discharging state, there is a corresponding suitable capacity range (first and second capacity ranges). Charging or discharging operations are performed within the suitable capacity range, which effectively ensures the reliability of charging or discharging and reduces the occurrence of faults caused by charging overflow or unstable power supply caused by insufficient power supply.

[0097] In this alternative embodiment, the rectification requirement is used to indicate that the AC power input to the energy storage PCS is rectified into DC power;

[0098] Inverter demand is used to indicate the conversion of DC power input to the energy storage PCS into AC power.

[0099] As can be seen, in this optional embodiment, the unit status of each power unit and the corresponding control requirements can be automatically detected. Specifically, using the target capacity of the power unit and the interaction status of the energy storage PCS corresponding to the power unit as analysis indicators, the unit status and control requirements of each power unit are accurately determined, thereby improving the accuracy of determining the unit status and control requirements of each power unit.

[0100] In another alternative embodiment, each energy storage PCS includes a first component for performing DC-AC conversion operations and a second component for performing voltage boosting operations;

[0101] The above step 104, based on the unit state corresponding to each power unit and the control requirements corresponding to that unit state, specifically includes the following methods for performing preset unit control operations on each power unit:

[0102] For each power unit, the operating mode of the first component in the power unit is switched according to the current interaction state of the energy storage PCS corresponding to the power unit, and the AC-DC conversion operation is performed on the target voltage flowing through the first component to obtain the AC-DC conversion voltage corresponding to the target voltage.

[0103] By combining the second component with the preset voltage conversion requirements, the voltage value corresponding to the AC-DC conversion voltage is adjusted to the target voltage range that matches the current interaction state of the energy storage PCS.

[0104] In this optional embodiment, when the current interaction state of the energy storage PCS is rectification state, after the target voltage flowing through the energy storage PCS undergoes an AC-DC conversion operation, the corresponding AC-DC conversion voltage obtained is a DC voltage:

[0105] When the current interaction state of the energy storage PCS is the inverter state, the target voltage flowing through the energy storage PCS undergoes an AC-DC conversion operation, and the corresponding AC-DC conversion voltage obtained is an AC voltage.

[0106] The first component is a DC / AC converter, and the second component is a DC / DC converter.

[0107] As can be seen, in this optional embodiment, the AC-DC conversion function and voltage rise / fall power in the power unit are realized through the first component and the second component, respectively, which improves the accuracy of AC-DC conversion and voltage rise / fall control of each power unit, that is, improves the control accuracy of voltage input and voltage output of each power unit, which is conducive to improving the control accuracy and control safety of the overall system corresponding to the power unit.

[0108] Example 2

[0109] Please see Figure 2 ,Figure 2 This is a flowchart illustrating another intelligent management and control method for a distributed energy storage PCS disclosed in an embodiment of the present invention. Figure 2 The described intelligent management and control method for distributed energy storage PCS can be applied to intelligent management and control devices for distributed energy storage PCS, and the embodiments of the present invention are not limited thereto. Figure 2 As shown, the intelligent management and control method for this distributed energy storage PCS can include the following operations:

[0110] 201. Determine the cell information of all cells in the energy storage system and the configuration information of the energy storage PCS. The cell information of all cells includes the total number of cells and the appropriate voltage of each cell.

[0111] 202. Based on the cell information and configuration information of all cells, and combined with the corresponding management and control requirements of the energy storage system, all cells are divided and configured to obtain multiple power units.

[0112] 203. Determine the current unit status of each power unit and the corresponding control requirements for that unit status.

[0113] 204. Based on the unit status corresponding to each power unit and the control requirements corresponding to that unit status, perform preset unit control operations on each power unit.

[0114] For further descriptions of steps 201-204 in this embodiment of the invention, please refer to the other specific descriptions of steps 101-104 in Embodiment 1. These descriptions will not be repeated in this embodiment of the invention.

[0115] 205. Collect the operating data of each power unit in real time to obtain the operating status of each power unit.

[0116] In this embodiment of the invention, the operating state includes a fault state indicating that the power unit has failed or a normal state that is the opposite of the fault state.

[0117] 206. When a target power unit in a faulty state is detected among all power units, determine the interaction lines between the target power unit and other power units.

[0118] 207. Based on the interaction line, control other power units to disconnect the exchange line with the target power unit and generate fault information for the target power unit.

[0119] In this embodiment of the invention, the fault information is used to feed back to the personnel responsible for processing the fault information, so that the personnel can perform preset fault handling operations on the target power unit according to the fault information.

[0120] It is evident that implementation Figure 2The intelligent management and control method of the distributed energy storage PCS described herein can realize real-time detection of power unit operating data, and then automatically switch the interactive line on and off and generate fault information when a target power unit in a fault state is detected, thereby improving the detection speed and processing efficiency of power unit faults.

[0121] In an optional embodiment, each power unit is set in a preset distribution hierarchy, and the higher the distribution hierarchy, the more power units are managed.

[0122] Before generating fault information for the target power unit in step 207 above, the method further includes:

[0123] Based on the interaction line, the target affected unit is determined from all other power units that is affected by the fault state corresponding to the target power unit. The target affected unit includes peer units, subordinate units and superior units.

[0124] Select the backup unit from all peer units that is in a faulty state as the target power unit; update the target power unit to a backup unit, and trigger the above-mentioned generation of fault information for the target power unit;

[0125] Among them, the same level unit is the unit that is at the same distribution level as the target power unit, and the distribution levels of the superior unit, the same level unit and the subordinate unit decrease.

[0126] In this optional embodiment, specifically, updating the target power unit to a spare unit may include:

[0127] Determine all interaction lines corresponding to the target power unit and the target influence unit, as well as the interaction parameters between the target power unit and the target influence unit;

[0128] According to the interaction parameters, set / adjust the unit parameters corresponding to the backup unit, and then replace the target power unit with the backup unit according to all the interaction lines corresponding to the target power unit and the target influence unit.

[0129] The interactive parameters include input, input voltage / power magnitude, control parameters of the target power unit controlling the target influence unit, etc., which are not limited in this embodiment of the invention.

[0130] As can be seen, in this optional embodiment, when processing the target power unit, the target influencing unit corresponding to the target power unit can be accurately identified, and then a backup unit can be accurately selected to replace the target power unit. This achieves accurate investigation and replacement of the target power unit, and improves the reliability of the system corresponding to the power unit and the accuracy of fault handling.

[0131] Example 3

[0132] Please see Figure 3 , Figure 3 This is a schematic diagram of the structure of an intelligent management and control device for a distributed energy storage PCS disclosed in an embodiment of the present invention. The intelligent management and control device for the distributed energy storage PCS can be an intelligent management and control terminal, equipment, system, or server for the distributed energy storage PCS. The server can be a local server, a remote server, or a cloud server (also known as a cloud server). When the server is not a cloud server, it can communicate with the cloud server; this embodiment of the present invention does not impose limitations. Figure 3 As shown, the intelligent management and control device for the distributed energy storage PCS may include a determination module 301, a partitioning and configuration module 302, and a management and control module 303, wherein:

[0133] The determination module 301 is used to determine the cell information of all cells in the energy storage system and the configuration information of the energy storage PCS. The cell information of all cells includes the total number of cells and the adapted voltage of each cell.

[0134] The partitioning and configuration module 302 is used to partition and configure all the battery cells according to the cell information and configuration information of all the battery cells, combined with the corresponding management and control requirements of the energy storage system, to obtain multiple power units. Each power unit includes a preset number of battery cells and at least one energy storage PCS for managing all the battery cells.

[0135] The determination module 301 is also used to determine the current unit state of each power unit and the control requirements corresponding to the unit state. The unit state includes the charging state when a charging operation is performed on the power unit or the discharging state when a discharging operation is performed on the power unit.

[0136] The control module 303 is used to perform preset unit control operations on each power unit according to the unit status corresponding to each power unit and the control requirements corresponding to the unit status; the preset unit control operations include electrical parameter adjustment and / or on / off control between power units.

[0137] It is evident that implementation Figure 3The intelligent management and control device for the distributed energy storage PCS described herein can automatically determine the cell information of all cells in the energy storage system and the configuration information of the energy storage PCS. Then, in combination with the management and control requirements of the energy storage system, it divides all cells into multiple power units. Based on the power status and management and control requirements of each power unit, it performs preset unit management and control operations on each power unit. Compared with the traditional management and control method for all series-connected cells, the management and control based on the power unit as a whole reduces the difficulty of adjusting the voltage consistency of all series-connected cells. On the other hand, the multi-cell management and control method based on the power unit as a whole reduces the management and control difficulty of all cells and improves the availability of the system corresponding to the power unit.

[0138] In an optional embodiment, the method by which the determining module 301 determines the current cell state of each power unit and the corresponding control requirements of the cell state specifically includes:

[0139] For each power unit, the target capacity of the power unit and the interaction state of the corresponding energy storage PCS are detected; the target capacity includes the total cell capacity and / or average cell capacity of all cells in the power unit; the interaction state includes rectification state or inverter state.

[0140] When the energy storage PCS corresponding to any power unit is in rectification mode, and the target capacity of the power unit is within the first capacity range corresponding to the rectification mode, the current unit state of the power unit is determined to be charging mode, and the control requirements corresponding to the charging mode are determined to be rectification requirement and buck requirement.

[0141] When the energy storage PCS corresponding to any power unit is in the inverter state, and the target capacity of the power unit is within the second capacity range corresponding to the inverter state, the current unit state of the power unit is determined to be the discharge state, and the control requirements corresponding to the discharge state are determined to be the inverter requirement and the boost requirement.

[0142] In this alternative embodiment, the rectification requirement is used to indicate that the AC power input to the energy storage PCS is rectified into DC power;

[0143] Inverter demand is used to indicate the conversion of DC power input to the energy storage PCS into AC power.

[0144] As can be seen, in this optional embodiment, the unit status of each power unit and the corresponding control requirements can be automatically detected. Specifically, using the target capacity of the power unit and the interaction status of the energy storage PCS corresponding to the power unit as analysis indicators, the unit status and control requirements of each power unit are accurately determined, thereby improving the accuracy of determining the unit status and control requirements of each power unit.

[0145] In another alternative embodiment, each energy storage PCS includes a first component for performing DC-AC conversion operations and a second component for performing voltage boosting operations;

[0146] The control module 303 performs preset unit control operations on each power unit according to the unit status and control requirements corresponding to that unit status. Specifically, these operations include:

[0147] For each power unit, the operating mode of the first component in the power unit is switched according to the current interaction state of the energy storage PCS corresponding to the power unit, and the AC-DC conversion operation is performed on the target voltage flowing through the first component to obtain the AC-DC conversion voltage corresponding to the target voltage.

[0148] By combining the second component with the preset voltage conversion requirements, the voltage value corresponding to the AC-DC conversion voltage is adjusted to the target voltage range that matches the current interaction state of the energy storage PCS.

[0149] In this optional embodiment, when the current interaction state of the energy storage PCS is rectification state, after the target voltage flowing through the energy storage PCS undergoes an AC-DC conversion operation, the corresponding AC-DC conversion voltage obtained is a DC voltage:

[0150] When the current interaction state of the energy storage PCS is the inverter state, the target voltage flowing through the energy storage PCS undergoes an AC-DC conversion operation, and the corresponding AC-DC conversion voltage obtained is an AC voltage.

[0151] The first component is a DC / AC converter, and the second component is a DC / DC converter.

[0152] As can be seen, in this optional embodiment, the AC-DC conversion function and voltage rise / fall power in the power unit are realized through the first component and the second component, respectively, which improves the accuracy of AC-DC conversion and voltage rise / fall control of each power unit, that is, improves the control accuracy of voltage input and voltage output of each power unit, which is conducive to improving the control accuracy and control safety of the overall system corresponding to the power unit.

[0153] In yet another optional embodiment, the device further includes a data acquisition module 304, a control module 305, and a generation module 306, wherein:

[0154] The acquisition module 304 is used to acquire the operating data of each power unit obtained by the partitioning configuration module 302 in real time, and obtain the operating status of each power unit. The operating status includes the fault status corresponding to the power unit being faulty or the normal status opposite to the fault status.

[0155] The determination module 301 is also used to determine the interaction lines between the target power unit and other power units when a target power unit in a fault state is detected among all power units.

[0156] The control module 305 is used to control other power units to disconnect the exchange line with the target power unit according to the interaction line.

[0157] The generation module 306 is used to generate fault information for the target power unit. The fault information is used to feed back to the personnel responsible for processing the fault information, so that the personnel can perform preset fault handling operations on the target power unit according to the fault information.

[0158] As can be seen, in this optional embodiment, real-time detection of power unit operating data can be achieved, and when a target power unit in a faulty state is detected, the switching of interactive lines and the generation of fault information can be automatically performed, thereby improving the detection speed and processing efficiency of power unit faults.

[0159] Optionally, each power unit is set in a preset distribution level, and the higher the distribution level, the more power units are managed;

[0160] The determination module 301 is also used to determine, according to the interaction line, the target affected unit affected by the fault state corresponding to the target power unit from all other power units before the generation module 306 generates fault information for the target power unit. The target affected unit includes peer units, subordinate units and superior units.

[0161] like Figure 4 As shown, the device also includes a screening and updating module 307, wherein:

[0162] The filtering and updating module 307 is used to filter out the backup units that are in a fault state as the target power unit from all peer units; update the target power unit as a backup unit; and trigger the generation module 306 to perform the above-mentioned generation of fault information for the target power unit.

[0163] Among them, the same level unit is the unit that is at the same distribution level as the target power unit, and the distribution levels of the superior unit, the same level unit and the subordinate unit decrease.

[0164] It is evident that implementation Figure 4 The intelligent management and control device of the distributed energy storage PCS described herein can accurately identify the target affected unit corresponding to the target power unit when processing the target power unit, and then accurately select the backup unit to replace the target power unit. This realizes the accurate investigation and replacement of the target power unit, and improves the reliability of the system corresponding to the power unit and the accuracy of fault handling.

[0165] Example 4

[0166] Please see Figure 5 , Figure 5 This is a schematic diagram of the structure of another intelligent control device for distributed energy storage PCS disclosed in an embodiment of the present invention. Figure 5 As shown, the intelligent control device for the distributed energy storage PCS may include:

[0167] Memory 401 storing executable program code;

[0168] Processor 402 coupled to memory 401;

[0169] The processor 402 calls the executable program code stored in the memory 401 to execute the steps in the intelligent management and control method of distributed energy storage PCS described in Embodiment 1 or Embodiment 2 of the present invention.

[0170] Example 5

[0171] This invention discloses a computer storage medium storing computer instructions. When these computer instructions are invoked, they are used to execute the steps in the intelligent management and control method for distributed energy storage PCS described in Embodiment 1 or Embodiment 2 of this invention.

[0172] Example 6

[0173] This invention discloses a computer program product, which includes a non-transitory computer storage medium storing a computer program, and the computer program is operable to cause a computer to perform the steps in the intelligent management method of the distributed energy storage PCS described in Embodiment 1 or Embodiment 2.

[0174] The device embodiments described above are merely illustrative. The modules described as separate components may or may not be physically separate, and the components shown as modules may or may not be physical modules; that is, they may be located in one place or distributed across multiple network modules. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0175] Through the detailed description of the above embodiments, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus necessary general-purpose hardware platforms, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solutions, in essence or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer storage medium, including read-only memory (ROM), random access memory (RAM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), one-time programmable read-only memory (OTPROM), electrically-erasable programmable read-only memory (EEPROM), compact disc read-only memory (CD-ROM) or other optical disc storage, disk storage, magnetic tape storage, or any other computer-readable medium that can be used to carry or store data.

[0176] Finally, it should be noted that the intelligent management method and device for distributed energy storage PCS disclosed in the embodiments of the present invention are merely preferred embodiments of the present invention, and are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for intelligent control of distributed energy storage PCS, characterized in that, The method includes: Determine the cell information of all cells in the energy storage system and the configuration information of the energy storage PCS. The cell information of all cells includes the total number of cells and the adapted voltage of each cell. Based on the cell information and configuration information of all the cells, and combined with the control requirements of the energy storage system, all the cells are divided and configured to obtain multiple power units. Each power unit includes a preset number of cells and at least one energy storage PCS for controlling all the cells. Each power unit is connected in series or in parallel with at least one other power unit, and all the power units are distributed in the energy storage system. Determine the current unit state of each power unit and the corresponding control requirements for the unit state. The unit state includes a charging state where a charging operation is performed on the power unit or a discharging state where a discharging operation is performed on the power unit. Based on the unit state corresponding to each power unit and the control requirements corresponding to that unit state, a preset unit control operation is performed on each power unit; the preset unit control operation includes electrical parameter adjustment and / or on / off control between power units. The method further includes: Real-time acquisition of operating data for each power unit to obtain the operating status of each power unit, the operating status including a fault status indicating that the power unit has failed or a normal status that is the opposite of the fault status; When a target power unit in the fault state is detected among all the power units, the interaction line between the target power unit and the other power units is determined. According to the interaction line, control other power units to disconnect their interaction lines with the target power unit, and generate fault information for the target power unit. The fault information is used to feed back to the personnel responsible for processing the fault information, so that the personnel can perform preset fault handling operations on the target power unit according to the fault information. Each of the power units is set in a preset distribution level, and the higher the distribution level, the more power units are controlled; Before generating fault information for the target power unit, the method further includes: Based on the interaction line, a target affected unit that is affected by the fault state corresponding to the target power unit is determined from all other power units. The target affected unit includes peer units, subordinate units, and superior units. Select a backup unit from all the peer units that is in the fault state of the target power unit; update the target power unit to the backup unit, and trigger the generation of fault information for the target power unit. The peer unit is a unit that is in the same distribution level as the target power unit, and the distribution levels of the superior unit, the peer unit, and the subordinate unit decrease in that order.

2. The intelligent control method for distributed energy storage PCS according to claim 1, characterized in that, Determining the current unit state of each power unit and the corresponding control requirements for that unit state includes: For each power unit, the target capacity of the power unit and the interaction state of the energy storage PCS corresponding to the power unit are detected; the target capacity includes the total cell capacity and / or average cell capacity of all cells in the power unit; the interaction state includes rectification state or inverter state. When the energy storage PCS corresponding to any of the power units is in the rectification state, and the target capacity of the power unit is within the first capacity range corresponding to the rectification state, the current unit state of the power unit is determined to be the charging state, and the control requirements corresponding to the charging state are determined to be rectification requirements and buck requirements. When the energy storage PCS corresponding to any of the power units is in the inverter state, and the target capacity of the power unit is within the second capacity range corresponding to the inverter state, the current unit state of the power unit is determined to be the discharge state, and the control requirements corresponding to the discharge state are determined to be inverter requirements and boost requirements.

3. The intelligent control method for distributed energy storage PCS according to claim 2, characterized in that, The rectification requirement is used to indicate that the AC power input to the energy storage PCS is rectified into DC power; The inverter requirement is used to invert the DC power input to the energy storage PCS into AC power.

4. The intelligent control method for distributed energy storage PCS according to claim 2 or 3, characterized in that, Each of the energy storage PCS includes a first component for performing DC to AC conversion operations and a second component for performing voltage boosting operations; The step of performing a preset unit control operation on each power unit according to the unit state corresponding to each power unit and the control requirements corresponding to that unit state includes: For each power unit, according to the current interaction state of the energy storage PCS corresponding to the power unit, the operating mode of the first component in the power unit is switched, and the first component performs an AC-DC conversion operation on the target voltage flowing through the first component to obtain the AC-DC conversion voltage corresponding to the target voltage; By combining the second component with the preset voltage conversion requirements, the voltage value corresponding to the AC-DC conversion voltage is adjusted to the target voltage range that matches the current interaction state of the energy storage PCS.

5. The intelligent control method for distributed energy storage PCS according to claim 4, characterized in that, When the current interaction state of the energy storage PCS is the rectification state, the target voltage flowing through the energy storage PCS, after performing the AC-DC conversion operation, results in a DC voltage: When the current interaction state of the energy storage PCS is the inverter state, the target voltage flowing through the energy storage PCS undergoes the AC-DC conversion operation, and the corresponding AC-DC conversion voltage is an AC voltage. The first component is specifically a DC / AC converter, and the second component is specifically a DC / DC converter.

6. An intelligent control device for a distributed energy storage PCS, characterized in that, The device is used to execute the intelligent management and control method for a distributed energy storage PCS as described in any one of claims 1-5, and the device comprises: The determination module is used to determine the cell information of all cells in the energy storage system and the configuration information of the energy storage PCS. The cell information of all cells includes the total number of cells and the adapted voltage of each cell. The partitioning and configuration module is used to partition and configure all the battery cells according to the cell information and configuration information of all the battery cells, combined with the control requirements of the energy storage system, to obtain multiple power units. Each power unit includes a preset number of battery cells and at least one energy storage PCS for controlling all the battery cells. The determining module is further configured to determine the current unit state of each power unit and the control requirements corresponding to the unit state. The unit state includes a charging state in which a charging operation is performed on the power unit or a discharging state in which a discharging operation is performed on the power unit. The control module is used to perform preset unit control operations on each power unit according to the unit state corresponding to each power unit and the control requirements corresponding to the unit state; the preset unit control operations include electrical parameter adjustment and / or on / off control between power units.

7. An intelligent control device for a distributed energy storage PCS, characterized in that, The device includes: Memory containing executable program code; A processor coupled to the memory; The processor calls the executable program code stored in the memory to execute the intelligent management and control method for distributed energy storage PCS as described in any one of claims 1-5.

8. A computer storage medium, characterized in that, The computer storage medium stores computer instructions, which, when invoked, are used to execute the intelligent control method for the distributed energy storage PCS as described in any one of claims 1-5.

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