A method and system for calculating the energy loss of energy storage grid-connected

Abstract

The application provides a kind of energy storage grid-connected electric energy loss calculation method and system, comprising: obtaining the operation data of each grid-connected node in power grid;Each grid-connected node is sequentially set as target node, and the node adjacent to target node is set as adjacent node of target node;According to the operation data and the type of target node and adjacent node, the electric energy loss value of the grid-connected node corresponding to target node is calculated;According to the electric energy loss value of each grid-connected node, the line electric energy loss value is obtained.The electric energy loss calculation method proposed in the application has high calculation flexibility, can obtain the electric energy loss value of each node and the entire power grid in real time, can effectively calculate the electric energy loss of each grid-connected node according to adjacent node, so as to accurately determine the location of electric energy loss;It can realize the electric energy loss of energy storage into power grid from detail to whole.

Description

Technical Field

[0001] This invention belongs to the field of energy storage and grid connection technology, specifically relating to a method and system for calculating power loss in energy storage and grid connection. Background Technology

[0002] With the depletion of fossil fuels and the increasing severity of environmental pollution, traditional energy development and utilization methods urgently need upgrading and transformation. Grid storage technology is an effective means to achieve large-scale integration of renewable energy, improve the safety and efficiency of power system operation, and increase the proportion of renewable energy generation.

[0003] When energy storage is connected to the grid, it has a significant impact on grid operation, including network losses, voltage, power quality, reliability, and system protection. Therefore, when energy storage is connected to the grid, it is essential to monitor various electrical parameters of the grid connection interface in real time and optimize the connection status of each energy storage unit by detecting grid power losses.

[0004] However, in current grid systems with energy storage integrated with the grid, the energy loss is often calculated by establishing an equivalent energy loss model for multiple energy storage units after processing each node. However, since energy storage units may operate in different modes, and adjacent units of different types can also affect each other, existing calculation methods cannot accurately calculate the energy loss at different types of energy storage points connected to the grid. This makes it impossible to achieve comprehensive detection of energy loss when energy storage is connected to the grid, and its applicability is extremely narrow. Summary of the Invention

[0005] To overcome the shortcomings of the existing technology, this invention proposes a method for calculating the power loss of grid-connected energy storage, the improvement of which includes:

[0006] Obtain operational data from each grid-connected node in the power grid;

[0007] Each grid-connected node is sequentially designated as a target node, and the nodes adjacent to the target nodes are designated as adjacent nodes of the target nodes.

[0008] Based on the operating data and types of the target node and its adjacent nodes, calculate the power loss value of the grid-connected node corresponding to the target node;

[0009] The power loss of the line is obtained based on the power loss value of each grid-connected node.

[0010] The grid-connected node includes energy storage connected at the grid-connected node.

[0011] The first preferred technical solution provided by the present invention is improved in that the step of sequentially setting each grid-connected node as a target node and setting the nodes adjacent to the target node as adjacent nodes of the target node includes:

[0012] Each grid-connected node in the power grid is sequentially sorted and coded starting from the far end of the substation, and the nodes in the sorted order are used as target nodes in sequence.

[0013] Based on the target node's encoding, retrieve the node whose encoding is followed by the next node in sequence as the adjacent node.

[0014] The second preferred technical solution provided by the present invention is improved in that, the step of calculating the power loss value of the grid-connected node corresponding to the target node based on the operating data and type of the target node and adjacent nodes includes:

[0015] Based on the operating data and type of adjacent nodes, calculate the active power and reactive power values ​​of the lines between the target node and adjacent nodes.

[0016] Based on the operating data and type of the target node, as well as the active and reactive power values ​​of the lines between the target node and adjacent nodes, calculate the active and reactive power losses of the target node.

[0017] Based on the active and reactive power losses of the target node, calculate the power loss value of the grid-connected node corresponding to the target node.

[0018] The third preferred technical solution provided by the present invention is improved in that the node type includes: unidirectional node and bidirectional node;

[0019] Among them, the power source connected to the grid at the unidirectional node is a conventional power source, and the power source connected to the grid at the bidirectional node is an energy storage power source.

[0020] The fourth preferred technical solution provided by the present invention is improved in that the step of calculating the active power and reactive power values ​​of the line between the target node and adjacent nodes based on the operating data and type of adjacent nodes includes:

[0021] When the adjacent nodes are unidirectional nodes, the active power and reactive power values ​​of the line between the target node and the adjacent nodes are calculated as follows:

[0022]

[0023]

[0024] When adjacent nodes are bidirectional nodes, the active power and reactive power values ​​of the line between the target node and adjacent nodes are calculated as follows:

[0025]

[0026]

[0027] Where, N i Let N represent the i-th target node. i+1 Let i represent the adjacent nodes of the i-th node. Represents the target node N i and neighboring node N i+1 The active power value of the line. Represents the target node N i and neighboring node N i+1 The reactive power value of the line. Indicates adjacent node N i+1 Active power is injected into the line. Indicates adjacent node N i+1 Injecting reactive power into the line, Indicates adjacent node N i+1 Energy storage injects active power. Indicates adjacent node N i+1 Energy storage injects reactive power. Indicates adjacent node N i+1 Active power consumption Indicates adjacent node N i+1 Reactive power consumption.

[0028] The fifth preferred technical solution provided by the present invention is improved in that the step of calculating the active power loss and reactive power loss of the target node based on the operating data and type of the target node, as well as the active power and reactive power values ​​of the lines between the target node and adjacent nodes, includes:

[0029] When the target node is a unidirectional node, the active power loss and reactive power loss of the target node are calculated as follows:

[0030]

[0031]

[0032] When the target node is a bidirectional node, the active power loss and reactive power loss of the target node are calculated as follows:

[0033]

[0034]

[0035] Where, N i Let N represent the i-th target node. i+1 Let i represent the adjacent nodes of the i-th node. Represents the target node Ni and neighboring node N i+1 The active power value of the line. Represents the target node N i and neighboring node N i+1 The reactive power value of the line. Represents the target node N i The active power output of the energy storage, Represents the target node N i The energy storage output reactive power value, U i Represents the target node N i The voltage value, R i Represents the target node N i The equivalent resistance value of the line, X i Represents the target node N i The equivalent reactance of the line, Represents the target node N i Active power consumption Represents the target node N i Reactive power consumption.

[0036] The sixth preferred technical solution provided by the present invention is improved in that the calculation formula for calculating the power loss value of the grid-connected node corresponding to the target node based on the active power loss and reactive power loss of the target node is as follows:

[0037] ΔA=ΔP+jΔQ

[0038] ΔA represents the power loss value of the grid-connected node corresponding to the target node, ΔP represents the active power loss of the target node, and ΔQ represents the reactive power loss of the target node.

[0039] The seventh preferred technical solution provided by the present invention is improved in that the step of obtaining the power loss of the line based on the power loss value of each grid-connected node includes:

[0040] Based on the power loss values ​​of each grid-connected node, the power loss of the power grid at each location of the line segment is obtained.

[0041] Based on the same inventive concept, the present invention also provides an energy loss calculation system for grid-connected energy storage, which is improved in that it includes: a data acquisition module, a node setting module, a node loss module and a line loss module.

[0042] The data acquisition module is used to acquire the operating data of each grid-connected node in the power grid;

[0043] The node setting module is used to sequentially set each grid-connected node as a target node, and set the nodes adjacent to the target node as adjacent nodes of the target node;

[0044] The node loss module is used to calculate the power loss value of the grid-connected node corresponding to the target node based on the operating data and type of the target node and adjacent nodes.

[0045] The line loss module is used to obtain the power loss of the power grid line segment based on the power loss value of each grid-connected node.

[0046] The grid-connected node includes energy storage that is connected to the grid at the grid-connected node.

[0047] The eighth preferred technical solution provided by the present invention is improved in that the node setting module includes: a target node unit and an adjacent node unit;

[0048] The target node unit is used to sort and encode each grid-connected node in the power grid starting from the far end of the substation, and to use the nodes in the sorting order as target nodes in sequence.

[0049] The adjacent unit is used to retrieve the next sequentially encoded node of the target node as the adjacent node according to the target node encoding.

[0050] The ninth preferred technical solution provided by the present invention is improved in that the node loss module includes: a line power unit, an active and reactive power unit and an energy loss unit.

[0051] The line power unit is used to calculate the active power and reactive power values ​​of the line between the target node and adjacent nodes based on the operating data and type of adjacent nodes.

[0052] The active and reactive power unit is used to calculate the active and reactive power losses of the target node based on the target node's operating data and type, as well as the active and reactive power values ​​of the lines between the target node and adjacent nodes.

[0053] The power loss unit is used to calculate the power loss value of the grid-connected node corresponding to the target node based on the active power loss and reactive power loss of the target node.

[0054] Compared with the closest existing technology, the present invention has the following beneficial effects:

[0055] This invention provides a method and system for calculating power loss in grid-connected energy storage, comprising: acquiring operational data of each grid-connected node in the power grid; sequentially designating each grid-connected node as a target node, and designating nodes adjacent to the target node as adjacent nodes of the target node; calculating the power loss value of the grid-connected node corresponding to the target node based on the operational data and type of the target node and adjacent nodes; and obtaining the power loss of the power grid line segment based on the power loss values ​​of each grid-connected node. The power loss calculation method of this invention has high computational flexibility, can obtain the power loss values ​​of each node and the entire power grid in real time, can effectively calculate the power loss of each grid-connected node based on adjacent nodes, thereby accurately pinpointing the location of power loss occurrence; and can achieve comprehensive, end-to-end power loss calculation for energy storage integrated into the power grid, from details to the overall picture.

[0056] The power loss calculation method provided by this invention can also obtain the power loss values ​​between each node in real time, and obtain the network loss of each line segment. The power loss calculation method for energy storage grid connection proposed in this invention is applicable to the accurate calculation of power loss of multiple types and quantities of energy storage grid connection, with a wide range of applications. It can perform power loss calculation for various types of grids connected with energy storage. By establishing different network loss calculation models for various node connection methods, and matching the corresponding network loss calculation model according to the actual node connection method, the applicability of network loss calculation to various networks can be improved, thereby greatly improving the calculation accuracy of various types of energy storage grid connection nodes. Attached Figure Description

[0057] Figure 1 A schematic diagram of a method for calculating power loss in grid-connected energy storage provided by the present invention;

[0058] Figure 2 A flowchart illustrating a specific embodiment of the energy loss calculation method for grid-connected energy storage provided by the present invention;

[0059] Figure 3 This is a schematic diagram of a power grid structure with energy storage connected in an embodiment of the present invention;

[0060] Figure 4 A schematic diagram of the basic structure of an energy storage grid-connected power loss calculation system provided by the present invention;

[0061] Figure 5 This invention provides a detailed structural schematic diagram of an energy loss calculation system for grid-connected energy storage. Detailed Implementation

[0062] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0063] Example 1:

[0064] A schematic diagram of the power loss calculation method for grid-connected energy storage provided by this invention is shown below. Figure 1 As shown, it includes:

[0065] Step 1: Obtain the operating data of each grid-connected node in the power grid;

[0066] Step 2: Set each grid-connected node as the target node in sequence, and set the nodes adjacent to the target nodes as the adjacent nodes of the target nodes;

[0067] Step 3: Calculate the power loss value of the grid-connected node corresponding to the target node based on the operating data and type of the target node and adjacent nodes;

[0068] Step 4: Based on the power loss values ​​of each grid-connected node, obtain the power loss of the power grid line segment;

[0069] Among them, grid-connected nodes include energy storage that is connected to the grid at the grid-connected node.

[0070] Specifically, the implementation of a method for calculating the power loss of grid-connected energy storage is as follows: Figure 2 As shown, it includes:

[0071] S100 encodes each grid-connected node in the power grid and monitors the operating data of each node in real time.

[0072] S200, lock the target node and its adjacent nodes, and obtain the target node code and target node operation data, as well as the adjacent node code and adjacent node operation data respectively;

[0073] S300: Retrieve the target node type based on the target node code; determine the adjacent node types based on the adjacent node codes;

[0074] S400, determine the network loss calculation type for the target node based on the target node type and the types of adjacent nodes;

[0075] S500, based on the network loss calculation type, retrieve the corresponding network loss calculation model;

[0076] S600 inputs the operating data of the target node and its adjacent nodes into the retrieved network loss calculation model to calculate the power loss value of the target node.

[0077] S700, each node is taken as the target node in sequence, and the power loss value of each node is obtained according to steps S200-S600, thereby obtaining the power loss of the line.

[0078] As an optimization of the above embodiment, each grid-connected node in the power grid is sequentially sorted starting from the far end of the substation, and the nodes in the sorting order are sequentially used as target nodes to calculate the power loss of the line segment and obtain the power loss of each node.

[0079] As an optimization of the above embodiment, in step S200, the next sequentially encoded node of the target node code is retrieved as the adjacent node according to the target node code.

[0080] As an optimization of the above embodiments, the target node type and adjacent node type are set, and the power supply is divided into unidirectional power generation power supply and bidirectional power generation power supply according to the characteristics of the power supply; the target node type is set as unidirectional node or bidirectional node according to the power supply type, and the adjacent node type is set as unidirectional node or bidirectional node.

[0081] A unidirectional power source that generates electrical energy and supplies it to the power grid;

[0082] A bidirectional power source includes energy storage and load. The energy storage generates electricity to supply power to the load and the grid, or the grid supplies power to the load in reverse.

[0083] In step S300:

[0084] Based on the target node code, determine whether the target node is a one-way node or a two-way node;

[0085] Based on the neighboring node codes, determine whether the neighboring nodes are unidirectional or bidirectional nodes.

[0086] The node types have been pre-defined and stored according to their numbers. By obtaining the number of the target node or adjacent nodes, the node type can be determined.

[0087] Among them, according to such Figure 3 The structure of the grid connected to energy storage, as shown, determines the network loss calculation type based on the target node type and the types of adjacent nodes. Among them, Figure 3 In this context, DG represents energy storage, and LOAD represents load. The steps include:

[0088] If the target node is a unidirectional node and the adjacent nodes are also unidirectional nodes, a one-to-one network loss calculation method is used in the network loss calculation, such as... Figure 3 If point 4 is taken as the target node, then point 5 is taken as the adjacent node.

[0089] If the target node is a unidirectional node and the adjacent nodes are bidirectional nodes, the network loss calculation adopts a single-to-double network loss calculation method, such as... Figure 3 If point 1 is taken as the target node, then point 2 is taken as the adjacent node.

[0090] If the target node is a bidirectional node and the adjacent nodes are unidirectional nodes, the network loss calculation adopts a two-to-one network loss calculation method, such as... Figure 3 If point 3 is taken as the target node, then point 4 is taken as the adjacent node.

[0091] If the target node is a bidirectional node and the adjacent nodes are also bidirectional nodes, a two-to-two network loss calculation method is used in the network loss calculation, such as... Figure 3 If point 2 is taken as the target node, then point 3 is taken as the adjacent node.

[0092] (1) The power loss calculated by the network loss calculation model used in the one-to-one network loss calculation method is:

[0093] ΔA=ΔP+jΔQ

[0094] Where ΔA represents network loss, i.e., power loss, ΔP represents active power loss, and ΔQ represents reactive power loss;

[0095] The formula for calculating active power loss ΔP is as follows:

[0096]

[0097] The formula for calculating reactive power loss ΔQ is as follows:

[0098]

[0099] Where, N i Let N represent the i-th target node. i+1 Let i represent the adjacent nodes of the i-th node. Represents the target node N i and neighboring node N i+1 The active power value of the line. Represents the target node N i and neighboring node N i+1 The reactive power value of the line. Represents the target node N i The active power output of the energy storage, Represents the target node N i The energy storage output reactive power value, U i Represents the target node N i The voltage value, R i Represents the target node N i The equivalent resistance value of the line, X i Represents the target node N i The equivalent reactance of the line;

[0100] Target node N i and neighboring node N i+1 Active power value of the line The calculation formula is as follows:

[0101]

[0102] Target node N i and neighboring node N i+1 reactive power value of the line The calculation formula is as follows:

[0103]

[0104] in, Indicates adjacent node N i+1 Active power is injected into the line. Indicates adjacent node N i+1 Injecting reactive power into the line, Indicates adjacent node N i+1 Energy storage injects active power. Indicates adjacent node N i+1 The energy storage injects reactive power.

[0105] (2) The power loss calculated by the network loss calculation model used in the single-to-double network loss calculation method is:

[0106] ΔA=ΔP+jΔQ

[0107] Where ΔA represents network loss, ΔP represents active power loss, and ΔQ represents reactive power loss;

[0108] The formula for calculating active power loss ΔP is as follows:

[0109]

[0110] The formula for calculating reactive power loss ΔQ is as follows:

[0111]

[0112] Where, N i Let N represent the i-th target node. i+1 Let i represent the adjacent nodes of the i-th node. Represents the target node N i and neighboring node N i+1 The active power value of the line. Represents the target node N i and neighboring node N i+1 The reactive power value of the line. Represents the target node N i The active power output of the energy storage, Represents the target node N i The energy storage output reactive power value, U i Represents the target node N iThe voltage value, R i Represents the target node N i The equivalent resistance value of the line, X i Represents the target node N i The equivalent reactance of the line;

[0113] Target node N i and neighboring node N i+1 Active power value of the line The calculation formula is as follows:

[0114]

[0115] Target node N i and neighboring node N i+1 reactive power value of the line The calculation formula is as follows:

[0116]

[0117] in, Indicates adjacent node N i+1 Active power is injected into the line. Indicates adjacent node N i+1 Injecting reactive power into the line, Indicates adjacent node N i+1 Energy storage injects active power. Indicates adjacent node N i+1 Energy storage injects reactive power. Indicates adjacent node N i+1 Active power consumption Indicates adjacent node N i+1 Reactive power consumption.

[0118] (3) The power loss calculated by the network loss calculation model used in the single network loss calculation method is:

[0119] ΔA=ΔP+jΔQ

[0120] Where ΔA represents network loss, ΔP represents active power loss, and ΔQ represents reactive power loss;

[0121] The formula for calculating active power loss ΔP is as follows:

[0122]

[0123] The formula for calculating reactive power loss ΔQ is as follows:

[0124]

[0125] Where, N i Let N represent the i-th target node. i+1Let i represent the adjacent nodes of the i-th node. Represents the target node N i and neighboring node N i+1 The active power value of the line. Represents the target node N i and neighboring node N i+1 The reactive power value of the line. Represents the target node N i The active power output of the energy storage, Represents the target node N i The energy storage output reactive power value, U i Represents the target node N i The voltage value, R i Represents the target node N i The equivalent resistance value of the line, X i Represents the target node N i The equivalent reactance of the line, Represents the target node N i Active power consumption Represents the target node N i Reactive power consumption;

[0126] Target node N i and neighboring node N i+1 Active power value of the line The calculation formula is as follows:

[0127]

[0128] Target node N i and neighboring node N i+1 reactive power value of the line The calculation formula is as follows:

[0129]

[0130] in, Indicates adjacent node N i+1 Active power is injected into the line. Indicates adjacent node N i+1 Injecting reactive power into the line, Indicates adjacent node N i+1 Energy storage injects active power. Indicates adjacent node N i+1 The energy storage injects reactive power.

[0131] (4) The power loss calculated by the network loss calculation model used in the double-to-double network loss calculation method is:

[0132] ΔA=ΔP+jΔQ

[0133] Where ΔA represents network loss, ΔP represents active power loss, and ΔQ represents reactive power loss;

[0134] The formula for calculating active power loss ΔP is as follows:

[0135]

[0136] The formula for calculating reactive power loss ΔQ is as follows:

[0137]

[0138] Where, N i Let N represent the i-th target node. i+1 Let i represent the adjacent nodes of the i-th node. Represents the target node N i and neighboring node N i+1 The active power value of the line. Represents the target node N i and neighboring node N i+1 The reactive power value of the line. Represents the target node N i The active power output of the energy storage, Represents the target node N i The energy storage output reactive power value, U i Represents the target node N i The voltage value, R i Represents the target node N i The equivalent resistance value of the line, X i Represents the target node N i The equivalent reactance of the line, Represents the target node N i Active power consumption Represents the target node N i Reactive power consumption;

[0139] Target node N i and neighboring node N i+1 Active power value of the line The calculation formula is as follows:

[0140]

[0141] Target node N i and neighboring node N i+1 reactive power value of the line The calculation formula is as follows:

[0142]

[0143] in, Indicates adjacent node N i+1 Active power is injected into the line. Indicates adjacent node N i+1 Injecting reactive power into the line, Indicates adjacent node N i+1 Energy storage injects active power. Indicates adjacent node N i+1 Energy storage injects reactive power. Indicates adjacent node N i+1 Active power consumption Indicates adjacent node N i+1 Reactive power consumption.

[0144] Example 2:

[0145] Based on the same inventive concept, this invention also provides a power loss calculation system for grid-connected energy storage. Since the principle of these devices in solving technical problems is similar to the power loss calculation method for grid-connected energy storage, the repetitions will not be repeated.

[0146] The basic structure of the system is as follows Figure 4 As shown, it includes: a data acquisition module, a node setting module, a node loss module, and a line loss module;

[0147] The data acquisition module is used to acquire the operating data of each grid-connected node in the power grid;

[0148] The node setting module is used to sequentially set each grid-connected node as the target node, and set the nodes adjacent to the target node as the adjacent nodes of the target node;

[0149] The node loss module is used to calculate the power loss value of the grid-connected node corresponding to the target node based on the operating data and type of the target node and adjacent nodes.

[0150] The line loss module is used to obtain the power loss of the power grid line segment based on the power loss value of each grid-connected node.

[0151] Among them, grid-connected nodes include energy storage that is connected to the grid at the grid-connected node.

[0152] The detailed structure of the power loss calculation system for grid-connected energy storage is as follows: Figure 5 As shown.

[0153] The node setting module includes: target node unit and adjacent node unit;

[0154] The target node unit is used to sort and encode each grid-connected node in the power grid starting from the far end of the substation, and to take the nodes as target nodes according to the sorting order.

[0155] The adjacent unit is used to retrieve the next sequentially encoded node of the target node as the adjacent node based on the target node's encoding.

[0156] The node loss module includes: line power unit, active and reactive power unit and power loss unit.

[0157] The line power unit is used to calculate the active power and reactive power values ​​of the line between the target node and adjacent nodes based on the operating data and type of adjacent nodes.

[0158] The active and reactive power unit is used to calculate the active and reactive power losses of the target node based on the target node's operating data and type, as well as the active and reactive power values ​​of the lines between the target node and adjacent nodes.

[0159] The power loss unit is used to calculate the power loss value of the grid-connected node corresponding to the target node based on the active power loss and reactive power loss of the target node.

[0160] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0161] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0162] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0163] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0164] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application and not to limit its protection scope. Although this application has been described in detail with reference to the above embodiments, those skilled in the art should understand that after reading this application, they can still make various changes, modifications or equivalent substitutions to the specific implementation of the application, but these changes, modifications or equivalent substitutions are all within the protection scope of the claims pending approval.

Claims

1. A method for calculating power loss in grid-connected energy storage, characterized in that, include: Obtain operational data from each grid-connected node in the power grid; Each grid-connected node is sequentially designated as a target node, and the nodes adjacent to the target nodes are designated as adjacent nodes of the target nodes. Based on the operating data and types of the target node and its adjacent nodes, calculate the power loss value of the grid-connected node corresponding to the target node; The power loss of the line is calculated based on the power loss values ​​of each grid-connected node. The grid-connected node includes energy storage that is connected to the grid at the grid-connected node; The step of calculating the power loss value of the grid-connected node corresponding to the target node based on the operating data and type of the target node and adjacent nodes includes: Based on the operating data and type of adjacent nodes, calculate the active power and reactive power values ​​of the lines between the target node and adjacent nodes. Based on the operating data and type of the target node, as well as the active and reactive power values ​​of the lines between the target node and adjacent nodes, calculate the active and reactive power losses of the target node. Based on the active and reactive power losses of the target node, calculate the power loss value of the grid-connected node corresponding to the target node. The node types include: one-way nodes and two-way nodes; Among them, the power source connected to the grid at the unidirectional node is a conventional power source, and the power source connected to the grid at the bidirectional node is an energy storage power source. The step of calculating the active and reactive power values ​​of the line between the target node and adjacent nodes based on the operating data and type of adjacent nodes includes: When the adjacent nodes are unidirectional nodes, the active power and reactive power values ​​of the line between the target node and the adjacent nodes are calculated as follows: When adjacent nodes are bidirectional nodes, the active power and reactive power values ​​of the line between the target node and adjacent nodes are calculated as follows: in, Indicates the first i Target nodes, Indicates the first i The neighboring nodes of each node, Represents the target node and adjacent nodes The active power value of the line. Represents the target node and adjacent nodes The reactive power value of the line. Indicates adjacent nodes Active power is injected into the line. Indicates adjacent nodes Injecting reactive power into the line, Indicates adjacent nodes Energy storage injects active power. Indicates adjacent nodes Energy storage injects reactive power. Indicates adjacent nodes Active power consumption Indicates adjacent nodes Reactive power consumption; The calculation of the active and reactive power losses of the target node based on its operating data and type, as well as the active and reactive power values ​​of the lines between the target node and adjacent nodes, includes: When the target node is a unidirectional node, the active power loss and reactive power loss of the target node are calculated as follows: When the target node is a bidirectional node, the active power loss and reactive power loss of the target node are calculated as follows: in, Represents the target node The active power output of the energy storage, Represents the target node The energy storage output reactive power value, Represents the target node voltage value, Represents the target node The equivalent resistance value of the line. Represents the target node The equivalent reactance of the line, Represents the target node Active power consumption Represents the target node Reactive power consumption.

2. The method as described in claim 1, characterized in that, The step of sequentially designating each grid-connected node as a target node and designating nodes adjacent to the target node as adjacent nodes of the target node includes: Each grid-connected node in the power grid is sequentially sorted and coded starting from the far end of the substation, and the nodes in the sorted order are used as target nodes in sequence. Based on the target node's encoding, retrieve the node whose encoding is followed by the next node in sequence as the adjacent node.

3. The method as described in claim 1, characterized in that, The formula for calculating the power loss value of the grid-connected node corresponding to the target node based on the active power loss and reactive power loss of the target node is as follows: This represents the power loss value of the grid-connected node corresponding to the target node. This represents the active power loss at the target node. This represents the reactive power loss of the target node.

4. The method as described in claim 1, characterized in that, The process of obtaining the power loss of the power grid lines based on the power loss values ​​of each grid-connected node includes: Based on the power loss values ​​of each grid-connected node, the power loss of the power grid at each location of the line segment is obtained.

5. A power loss calculation system for grid-connected energy storage, characterized in that, include: Data acquisition module, node setting module, node loss module, and line loss module; The data acquisition module is used to acquire the operating data of each grid-connected node in the power grid; The node setting module is used to sequentially set each grid-connected node as a target node, and set the nodes adjacent to the target node as adjacent nodes of the target node; The node loss module is used to calculate the power loss value of the grid-connected node corresponding to the target node based on the operating data and type of the target node and adjacent nodes. The line loss module is used to obtain the power loss of the power grid line segment based on the power loss value of each grid-connected node. The grid-connected node includes energy storage that is connected to the grid at the grid-connected node; The node loss module includes: a line power unit, an active and reactive power unit, and an energy loss unit. The line power unit is used to calculate the active power and reactive power values ​​of the line between the target node and adjacent nodes based on the operating data and type of adjacent nodes. The active and reactive power unit is used to calculate the active and reactive power losses of the target node based on the target node's operating data and type, as well as the active and reactive power values ​​of the lines between the target node and adjacent nodes. The power loss unit is used to calculate the power loss value of the grid-connected node corresponding to the target node based on the active power loss and reactive power loss of the target node. The node types include: one-way nodes and two-way nodes; Among them, the power source connected to the grid at the unidirectional node is a conventional power source, and the power source connected to the grid at the bidirectional node is an energy storage power source. The step of calculating the active and reactive power values ​​of the line between the target node and adjacent nodes based on the operating data and type of adjacent nodes includes: When the adjacent nodes are unidirectional nodes, the active power and reactive power values ​​of the line between the target node and the adjacent nodes are calculated as follows: When adjacent nodes are bidirectional nodes, the active power and reactive power values ​​of the line between the target node and adjacent nodes are calculated as follows: in, Indicates the first i Target nodes, Indicates the first i The neighboring nodes of each node, Represents the target node and adjacent nodes The active power value of the line. Represents the target node and adjacent nodes The reactive power value of the line. Indicates adjacent nodes Active power is injected into the line. Indicates adjacent nodes Injecting reactive power into the line, Indicates adjacent nodes Energy storage injects active power. Indicates adjacent nodes Energy storage injects reactive power. Indicates adjacent nodes Active power consumption Indicates adjacent nodes Reactive power consumption; The calculation of the active and reactive power losses of the target node based on its operating data and type, as well as the active and reactive power values ​​of the lines between the target node and adjacent nodes, includes: When the target node is a unidirectional node, the active power loss and reactive power loss of the target node are calculated as follows: When the target node is a bidirectional node, the active power loss and reactive power loss of the target node are calculated as follows: in, Represents the target node The active power output of the energy storage, Represents the target node The energy storage output reactive power value, Represents the target node voltage value, Represents the target node The equivalent resistance value of the line. Represents the target node The equivalent reactance of the line, Represents the target node Active power consumption Represents the target node Reactive power consumption.

6. The system as described in claim 5, characterized in that, The node setting module includes: a target node unit and adjacent node units; The target node unit is used to sort and encode each grid-connected node in the power grid starting from the far end of the substation, and to use the nodes in the sorting order as target nodes in sequence. The adjacent node unit is used to retrieve the next sequentially encoded node of the target node as an adjacent node according to the target node encoding.

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