Power grid node recovery importance evaluation method, system and device and medium

Abstract

The invention belongs to the technical field of large power grid recovery, and discloses a power grid node recovery importance evaluation method, system and device and a medium, and the method comprises the steps: determining a power failure region of a power grid based on obtained power grid monitoring state data, dividing the power failure region through a dynamic partitioning method, and obtaining a plurality of recovery partitions for parallel recovery; respectively calculating available recovery power margins of the whole network and each recovery partition according to the power grid monitoring state data; and for the to-be-recovered nodes in the recovery partition, carrying out importance evaluation on the recovery nodes according to the multi-dimensional indexes of the to-be-recovered nodes. According to the method, the importance degrees of the power generation nodes and the non-power generation nodes are unified to the expected recovery income, so that unified sorting of the power generation nodes and the non-power generation nodes is realized, the problem that a traditional method depends on manual assignment of unit recovery priorities is avoided, and a good foundation is laid for subsequent recovery decision optimization.

Description

Technical Field

[0001] The present invention relates to the technical field of large power grid restoration, and in particular to a method, system, device and medium for evaluating the importance of power grid node restoration. Background Art

[0002] The purpose of power grid restoration control after a blackout is to quickly, safely, and economically restore power supply and avoid introducing new safety and stability risks. To this end, during the power grid restoration process, it is necessary to dynamically analyze the key nodes to be restored, build a reasonable transition grid containing key nodes, gradually expand the available restoration power and restoration range, and provide decision support for dispatching and operation personnel.

[0003] Most existing studies analyze the importance of nodes and lines from the perspective of the topological characteristics of the power network and optimize the skeleton network. Among them, node importance is a key indicator for optimizing restoration decisions. Currently, node contraction method, betweenness method, and deletion method are mostly used to evaluate the topological importance of nodes from a global perspective; the paper "Two-layer Optimization Strategy for Network Reconstruction Based on Node Importance Evaluation Matrix" further introduces an importance evaluation matrix to comprehensively consider the global importance of nodes and local factors such as the influence of adjacent nodes. For power generation nodes, the technical parameters of the units are comprehensively considered to determine their startup priority. Different from the above-mentioned deterministic indicators, the paper "Skeleton Network Reconstruction Based on Node Recovery Reliability" proposes a node recovery reliability indicator as the basis for node recovery. The paper "Identification of Critical Lines in Transmission Network Grid Restoration Schemes" defines a relative line betweenness indicator to characterize the availability of the line, and proposes a line importance indicator based on the impact of line commissioning failure on the restoration scheme.

[0004] Most of the above studies analyze the importance of nodes based on topological characteristics, or simply use power generation capacity or load outage losses as the load recovery benefits and importance of nodes. It is difficult to fully reflect the expected recovery benefits of nodes, and it is also impossible to achieve a unified ranking of the importance of power generation nodes and non-power generation nodes, so it relies on artificially specifying the priority of power generation nodes. In addition, there is currently no technology that involves the impact of disaster factors on node importance assessment and target grid optimization.

[0005] Therefore, how to provide a method, system, device and medium for evaluating the importance of power grid node restoration is a problem that needs to be solved urgently. Summary of the invention

[0006] The embodiments of the present invention provide a method, system, device and medium for evaluating the importance of power grid node restoration to solve the above-mentioned technical problems in the prior art.

[0007] In order to have a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. This summary is not intended to be a general review, nor is it intended to identify key / important components or to delineate the scope of protection of these embodiments. Its only purpose is to present some concepts in a simple form as a preface to the detailed description that follows.

[0008] According to a first aspect of an embodiment of the present invention, a method for evaluating the importance of power grid node restoration is provided.

[0009] In one embodiment, a method for evaluating the importance of power grid node restoration includes:

[0010] Determine the power outage area of ​​the power grid based on the acquired power grid monitoring status data, divide the power outage area by a dynamic partitioning method and obtain a number of recovery partitions for parallel recovery; the power grid monitoring status data includes real-time operation data, power outage status, recoverable status and abnormal alarm data;

[0011] According to the power grid monitoring status data, the available restoration power margin of the whole network and each restoration zone is calculated respectively;

[0012] For the nodes to be restored in the recovery partition, the importance of the restoration nodes is evaluated based on the multi-dimensional indicators of the nodes to be restored.

[0013] In one embodiment, the calculation formulas for calculating the available restoration power margin of the entire network and each restoration partition respectively according to the power grid monitoring status data are as follows:

[0014]

[0015]

[0016] Where η sys , η s,n Respectively represent the available recovery power margin of the whole network and the nth recovery partition, n=1,2,…,N S , n represents the recovery partition number, N S Indicates the total number of recovery partitions. Represent the current available recovery power of the entire network and the nth recovery partition respectively, They represent the total amount of load to be restored in the entire network and the nth recovery partition respectively.

[0017] In one embodiment, for a node to be restored in a restoration partition, evaluating the importance of the restoration node according to multi-dimensional indicators of the node to be restored includes:

[0018] Obtaining a node set of the entire network, and calculating an electrical topology characteristic index of each node to be restored in the restoration partition, wherein the electrical topology characteristic index is a node betweenness under a real-time power grid state;

[0019] For each node to be restored in each restoration partition, a restoration benefit index of the node to be restored is calculated based on an electrical topology characteristic index and an available restoration power margin;

[0020] Based on the recovery benefit index of the node to be recovered, the importance index of the node to be recovered is calculated.

[0021] In one embodiment, the node set of the entire network is obtained, and the calculation formula for calculating the electrical topology characteristic index of each node to be restored in the restoration partition is:

[0022]

[0023] In the formula, represents the betweenness of node m, m∈V, V represents the set of nodes in the entire network; N 0,s,t represents the number of shortest paths from node s to t, N 0,s,t (m) represents the number of shortest paths from node s to t passing through node m.

[0024] In one embodiment, the restoration benefit index of the node to be restored includes: an estimated value of the expected load restoration benefit, extended available restoration power, extended incremental restoration range benefit, comprehensive load restoration benefit, and expected restoration benefit;

[0025] The calculation formula for the estimated value of the expected load recovery benefit is:

[0026]

[0027] In the formula, I B,L,m represents the estimated value of the expected load recovery benefit, t v,e represents the cut-off time for evaluating the estimated value of load recovery benefit, t v,c represents the current moment of load expected recovery benefit estimation, T E Indicates the preset evaluation duration, t L,m represents the average recovery time of the load in node m, N m Indicates recovery partition S n Current available recovery power The total number of loads that can be restored in node m, N Z P represents the total number of loads that can be restored when the remaining available restoration power is used to restore the load within the power supply range of node m while satisfying the load basis in node m; l,d , R l,d represents the dth load to be restored at node m and its unit load restoration benefit; P l,f , R l,f represents the fth outage load within the power supply range of node m and its unit load benefit; γ B,m,f Represents the delay correction factor, RB,m represents the inherent benefit of restoring node m. If node m is a partition boundary connected node, I conn,m represents the expected benefit of inter-partition connectivity through node m;

[0028] The extended available restorable power includes: the extended available restorable power of the power generation node and the extended available restorable power of the non-power generation node;

[0029] The extended available restorable power of the power generation node refers to the calculation formula of the extended available restorable power when the node m is a power generation node:

[0030]

[0031] In the formula, represents the extended available recovery power of the generating node m′, P G,m′ represents the sum of the rated outputs of the units in the power generation node m′; γ B,S,m′ represents the recovery delay coefficient of the power generation node m′, S represents the recovery power node with the shortest path to the power generation node m′, and N G,m′ represents the total number of units to be started within the power supply range of the power generation node m′, P G,f represents the rated output of the fth unit; γ B,m′,f represents the delay coefficient of unit f;

[0032] The extended available restorable power of the non-power generation node refers to the calculation formula of the extended available restorable power when the node m is a non-power generation node:

[0033]

[0034] In the formula, represents the extended available recovery power of the non-generation node m″, The current available recovery power of the nth recovery partition, N G,m″ represents the total number of units to be started within the power supply range of the non-generation node m″, P G,f represents the rated output of the fth unit; γ B,m″,f represents the delay coefficient of unit f;

[0035] The comprehensive load recovery benefits include: comprehensive load recovery benefits of power generation nodes and comprehensive load recovery benefits of non-power generation nodes;

[0036] The comprehensive load recovery benefit of the power generation node refers to the calculation formula of the comprehensive load recovery benefit when the node m is a power generation node:

[0037]

[0038] In the formula, represents the comprehensive load recovery benefit of power generation node m′, I″ B,L,m′ represents the load recovery benefit after correction at the generation node m′; represents the benefit of extending the incremental recovery range of node m′;

[0039] The comprehensive load recovery benefit of the non-power generation node refers to the calculation formula of the comprehensive load recovery benefit when the node m is a non-power generation node:

[0040]

[0041] In the formula, represents the comprehensive load recovery benefit of non-generation node m″, I′ G,L,m″ represents the load recovery benefit after correction at the non-generation node m″; represents the benefit within the extended incremental restoration range of the non-generation node m″;

[0042] The expected recovery benefits include: the expected recovery benefits of power generation nodes and the expected recovery benefits of non-power generation nodes;

[0043] The expected recovery benefit of the power generation node refers to the calculation formula of the expected recovery benefit when the node m is a power generation node:

[0044]

[0045] In the formula, I B,m′ represents the expected recovery benefit of the power generation node m′, represents the comprehensive load recovery benefit of power generation node m′, C B,m′ represents the power generation cost of power generation node m′, η sys , η s,n They represent the available restoration power margin of the whole network and the nth restoration partition respectively;

[0046] The expected restoration benefit of the non-power generation node refers to the calculation formula of the expected restoration benefit when the node m is a non-power generation node:

[0047]

[0048] In the formula, I G,m″ represents the expected restoration benefit of the non-generation node m″, represents the comprehensive load recovery benefit of non-generation node m″, represents the comprehensive load recovery benefit of the generation node m′,

[0049] C G,m″ represents the load restoration cost of non-generation node m″, η sys , η s,n Represent the available recovery power margin of the whole network and the nth recovery partition, IB,m′ It represents the expected recovery benefit of power generation node m′.

[0050] In one embodiment, based on the recovery benefit index of the node to be restored, calculating the importance index of the node to be restored includes:

[0051] Normalize node betweenness and expected return respectively;

[0052] Calculate the importance of the node to be restored according to the normalized node betweenness and expected benefits, where the importance of the node to be restored includes: the importance of the power generation node and the importance of the non-power generation node;

[0053] Based on the importance of the nodes to be restored, the nodes to be restored are sorted from large to small.

[0054] In one embodiment, the calculation formula of the importance of the power generation node is:

[0055]

[0056] In the formula, represents the importance of non-generation node m′, represents the betweenness of non-generation node m′ after normalization, I′ B,m′ represents the expected restoration benefit of the non-generation node m′ after normalization, ω3 and ω4 represent the betweenness of the non-generation node m′ after normalization and the weight of the expected restoration benefit of the non-generation node m′ after normalization, respectively.

[0057] The calculation formula of the importance of the non-power generation node is:

[0058]

[0059] In the formula, represents the importance of non-generation node m″, represents the betweenness of non-generation node m″ after normalization, I G,m″ represents the expected restoration benefit of the non-generation node m″ after normalization, ω1 and ω2 represent the weights of the betweenness of the non-generation node m″ and the expected restoration benefit of the generation node m″ after normalization, respectively.

[0060] According to a second aspect of an embodiment of the present invention, a power grid node restoration importance assessment system is provided.

[0061] In one embodiment, the power grid node restoration importance assessment system includes:

[0062] A partitioning module is used to determine the power outage area of ​​the power grid based on the acquired power grid monitoring status data, divide the power outage area by a dynamic partitioning method and obtain a number of recovery partitions for parallel recovery; the power grid monitoring status data includes real-time operation data, power outage status, recoverable status and abnormal alarm data;

[0063] The available restoration power margin calculation module is used to calculate the available restoration power margin of the entire network and each restoration partition according to the power grid monitoring status data;

[0064] The importance evaluation module is used to evaluate the importance of the nodes to be restored in the recovery partition according to the multi-dimensional indicators of the nodes to be restored.

[0065] In one embodiment, the calculation formulas for calculating the available restoration power margin of the entire network and each restoration partition respectively according to the power grid monitoring status data are as follows:

[0066]

[0067] Where η sys , η s,n Respectively represent the available recovery power margin of the whole network and the nth recovery partition, n=1,2,…,N S , n represents the recovery partition number, N S Indicates the total number of recovery partitions. Represent the current available recovery power of the entire network and the nth recovery partition respectively, They represent the total amount of load to be restored in the entire network and the nth recovery partition respectively.

[0068] In one embodiment, for a node to be restored in a restoration partition, evaluating the importance of the restoration node according to multi-dimensional indicators of the node to be restored includes:

[0069] Obtaining a node set of the entire network, and calculating an electrical topology characteristic index of each node to be restored in the restoration partition, wherein the electrical topology characteristic index is a node betweenness under a real-time power grid state;

[0070] For each node to be restored in each restoration partition, a restoration benefit index of the node to be restored is calculated based on an electrical topology characteristic index and an available restoration power margin;

[0071] Based on the recovery benefit index of the node to be recovered, the importance index of the node to be recovered is calculated.

[0072] In one embodiment, the node set of the entire network is obtained, and the calculation formula for calculating the electrical topology characteristic index of each node to be restored in the restoration partition is:

[0073]

[0074] In the formula, represents the betweenness of node m, m∈V, V represents the set of nodes in the entire network; N 0,s,t represents the number of shortest paths from node s to t, N 0,s,t (m) represents the number of shortest paths from node s to t passing through node m.

[0075] In one embodiment, the restoration benefit index of the node to be restored includes: an estimated value of the expected load restoration benefit, extended available restoration power, extended incremental restoration range benefit, comprehensive load restoration benefit, and expected restoration benefit;

[0076] The calculation formula for the estimated value of the expected load recovery benefit is:

[0077]

[0078] In the formula, I B,L,m represents the estimated value of the expected load recovery benefit, t v,e represents the cut-off time for evaluating the estimated value of load recovery benefit, t v,c represents the current moment of load expected recovery benefit estimation, T E Indicates the preset evaluation duration, t L,m represents the average recovery time of the load in node m, N m Indicates recovery partition S n Current available recovery power The total number of loads that can be restored in node m, N Z P represents the total number of loads that can be restored when the remaining available restoration power is used to restore the load within the power supply range of node m while satisfying the load basis in node m; l,d , R l,d represents the dth load to be restored at node m and its unit load restoration benefit; P l,f , R l,f represents the fth outage load within the power supply range of node m and its unit load benefit; γ B,m,f Represents the delay correction factor, R B,m represents the inherent benefit of restoring node m. If node m is a partition boundary connected node, I conn,m represents the expected benefit of inter-partition connectivity through node m;

[0079] The extended available restorable power includes: the extended available restorable power of the power generation node and the extended available restorable power of the non-power generation node;

[0080] The extended available restorable power of the power generation node refers to the calculation formula of the extended available restorable power when the node m is a power generation node:

[0081]

[0082] In the formula, represents the extended available recovery power of the generating node m′, P G,m′ represents the sum of the rated outputs of the units in the power generation node m′; γ B,S,m′ represents the recovery delay coefficient of the power generation node m′, S represents the recovery power node with the shortest path to the power generation node m′, and N G,m′ represents the total number of units to be started within the power supply range of the power generation node m′, P G,f represents the rated output of the fth unit; γ B,m′,f represents the delay coefficient of unit f;

[0083] The extended available restorable power of the non-power generation node refers to the calculation formula of the extended available restorable power when the node m is a non-power generation node:

[0084]

[0085] In the formula, represents the extended available recovery power of the non-generation node m″, The current available recovery power of the nth recovery partition, N G,m″ represents the total number of units to be started within the power supply range of the non-generation node m″, P G,f represents the rated output of the fth unit; γ B,m″,f represents the delay coefficient of unit f;

[0086] The comprehensive load recovery benefits include: comprehensive load recovery benefits of power generation nodes and comprehensive load recovery benefits of non-power generation nodes;

[0087] The comprehensive load recovery benefit of the power generation node refers to the calculation formula of the comprehensive load recovery benefit when the node m is a power generation node:

[0088]

[0089] In the formula, represents the comprehensive load recovery benefit of power generation node m′, I″ B,L,m′ represents the load recovery benefit after correction at the generation node m′; represents the benefit of extending the incremental recovery range of node m′;

[0090] The comprehensive load recovery benefit of the non-power generation node refers to the calculation formula of the comprehensive load recovery benefit when the node m is a non-power generation node:

[0091]

[0092] In the formula, represents the comprehensive load recovery benefit of non-generation node m″, I′G,L,m″ represents the load recovery benefit after correction at the non-generation node m″; represents the benefit within the extended incremental restoration range of the non-generation node m″;

[0093] The expected recovery benefits include: the expected recovery benefits of power generation nodes and the expected recovery benefits of non-power generation nodes;

[0094] The expected recovery benefit of the power generation node refers to the calculation formula of the expected recovery benefit when the node m is a power generation node:

[0095]

[0096] In the formula, I B,m′ represents the expected recovery benefit of the power generation node m′, represents the comprehensive load recovery benefit of power generation node m′, C B,m′ represents the power generation cost of power generation node m′, η sys , η s,n They represent the available restoration power margin of the whole network and the nth restoration partition respectively;

[0097] The expected restoration benefit of the non-power generation node refers to the calculation formula of the expected restoration benefit when the node m is a non-power generation node:

[0098]

[0099] In the formula, I G,m″ represents the expected restoration benefit of the non-generation node m″, represents the comprehensive load recovery benefit of non-generation node m″, represents the comprehensive load recovery benefit of the generation node m′,

[0100] C G,m″ represents the load restoration cost of non-generation node m″, η sys , η s,n Represent the available recovery power margin of the whole network and the nth recovery partition, I B,m′ It represents the expected recovery benefit of power generation node m′.

[0101] In one embodiment, based on the recovery benefit index of the node to be restored, calculating the importance index of the node to be restored includes:

[0102] Normalize node betweenness and expected return respectively;

[0103] Calculate the importance of the node to be restored according to the normalized node betweenness and expected benefits, where the importance of the node to be restored includes: the importance of the power generation node and the importance of the non-power generation node;

[0104] Based on the importance of the nodes to be restored, the nodes to be restored are sorted from large to small.

[0105] In one embodiment, the calculation formula of the importance of the power generation node is:

[0106]

[0107] In the formula, represents the importance of non-generation node m′, represents the betweenness of non-generation node m′ after normalization, I′ B,m′ represents the expected restoration benefit of the non-generation node m′ after normalization, ω3 and ω4 represent the betweenness of the non-generation node m′ after normalization and the weight of the expected restoration benefit of the non-generation node m′ after normalization, respectively.

[0108] The calculation formula of the importance of the non-power generation node is:

[0109]

[0110] In the formula, represents the importance of non-generation node m″, represents the betweenness of non-generation node m″ after normalization, I G,m″ represents the expected restoration benefit of the non-generation node m″ after normalization, ω1 and ω2 represent the weights of the betweenness of the non-generation node m″ and the expected restoration benefit of the generation node m″ after normalization, respectively.

[0111] According to a third aspect of an embodiment of the present invention, a computer device is provided.

[0112] In some embodiments, the computer device includes a memory and a processor, the memory stores a computer program, and the processor implements the steps of the above method when executing the computer program.

[0113] According to a fourth aspect of embodiments of the present invention, a computer-readable storage medium is provided.

[0114] In one embodiment, the computer-readable storage medium stores a computer program, and the computer program implements the steps of the above method when executed by a processor.

[0115] The technical solution provided by the embodiment of the present invention may have the following beneficial effects:

[0116] 1. The present invention provides a method, system, device and medium for evaluating the importance of power grid node restoration. On the basis of the traditional method based on system electrical characteristics and topological characteristics, it further considers the important load of the node, the extended available power and the incremental recovery range capability, comprehensively evaluates the node load recovery benefit, and combines the available recovery power margin to unify the importance of power generation nodes and non-power generation nodes to the expected recovery benefit, thereby achieving unified sorting of power generation nodes and non-power generation nodes, and avoiding the problem of traditional methods relying on manually specified unit recovery priorities, laying a good foundation for subsequent recovery decision optimization, such as recovery path optimization, target grid optimization, etc.

[0117] 2. The present invention proposes a node importance index that takes into account factors such as node load recovery benefits, expanded available recovery power, and recovery range capabilities, to achieve a unified importance evaluation of power generation and non-power generation nodes, and can dynamically update node importance and ranking according to power grid outage scenarios and recovery processes, providing decision support for dispatching and operating personnel.

[0118] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0119] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0120] Figure 1 is a flow chart of a method for evaluating the importance of power grid node restoration according to an exemplary embodiment;

[0121] Figure 2 is a principle block diagram of a power grid node restoration importance assessment system according to an exemplary embodiment;

[0122] Figure 3 is a structural schematic diagram of a computer device according to an exemplary embodiment;

[0123] Figure 4 It is a schematic diagram of the composition of expected node restoration benefits and influencing factors in a method for evaluating the importance of power grid node restoration according to an exemplary embodiment. DETAILED DESCRIPTION

[0124] The following description and accompanying drawings fully illustrate the specific embodiments of this article so that those skilled in the art can practice them. Parts and features of some embodiments may be included in or replace parts and features of other embodiments. The scope of the embodiments of this article includes the entire scope of the claims, as well as all available equivalents of the claims. Herein, the terms "first", "second", etc. are only used to distinguish one element from another, without requiring or implying any actual relationship or order between these elements. In fact, the first element can also be called the second element, and vice versa. Moreover, the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that the structure, device or equipment including a series of elements includes not only those elements, but also other elements that are not explicitly listed, or also include elements inherent to such structure, device or equipment. In the absence of more restrictions, the elements defined by the sentence "including one..." do not exclude the existence of other identical elements in the structure, device or equipment including the elements. Each embodiment is described in a progressive manner herein, and each embodiment focuses on the differences from other embodiments, and the same and similar parts between the embodiments can be referred to each other.

[0125] The terms "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. in this document indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing this document and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In the description of this document, unless otherwise specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a mechanical connection or an electrical connection, it can also be the internal communication of two elements, it can be a direct connection, or it can be an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0126] As used herein, the term "plurality" means two or more than two, unless otherwise specified.

[0127] In this document, the character " / " indicates that the preceding and following objects are in an "or" relationship. For example, A / B means: A or B.

[0128] In this article, the term "and / or" is a description of the association relationship between objects, indicating that three relationships may exist. For example, A and / or B means: A or B, or, A and B.

[0129] It should be understood that, although the various steps in the flow chart are displayed in sequence according to the indication of the arrows, these steps are not necessarily executed in sequence according to the order indicated by the arrows. Unless there is a clear description in this article, the execution of these steps is not strictly limited in order, and these steps can be executed in other orders. Moreover, at least a portion of the steps in the figure may include multiple sub-steps or multiple stages, and these sub-steps or stages are not necessarily executed at the same time, but can be executed at different times, and the execution order of these sub-steps or stages is not necessarily to be carried out in sequence, but can be executed in turn or alternately with other steps or at least a portion of the sub-steps or stages of other steps.

[0130] Each module in the device or system of the present application can be implemented in whole or in part by software, hardware, or a combination thereof. The above modules can be embedded in or independent of a processor in a computer device in the form of hardware, or can be stored in a memory in a computer device in the form of software, so that the processor can call and execute operations corresponding to the above modules.

[0131] In the absence of conflict, the embodiments of the present invention and the features of the embodiments may be combined with each other.

[0132] Figure 1 A method for evaluating the importance of power grid node restoration according to the present invention is shown.

[0133] In this optional embodiment, the power grid node restoration importance assessment method includes:

[0134] Step S101, determining the power outage area of ​​the power grid based on the acquired power grid monitoring status data, dividing the power outage area by a dynamic partitioning method and obtaining a number of recovery partitions for parallel recovery; the power grid monitoring status data includes real-time operation data, power outage status, recoverable status and abnormal alarm data;

[0135] Step S103, calculating the available restoration power margin of the entire network and each restoration partition respectively according to the power grid monitoring status data;

[0136] Step S105: For the nodes to be restored in the restoration partition, importance of the restoration nodes is evaluated according to multi-dimensional indicators of the nodes to be restored.

[0137] In this optional embodiment, when evaluating the importance of the nodes to be restored in the recovery partition based on the multi-dimensional indicators of the nodes to be restored, the node set of the entire network can be obtained, and the electrical topology characteristic indicators of each node to be restored in the recovery partition can be calculated, and the electrical topology characteristic indicators are the node betweenness under the real-time power grid state; for each node to be restored in the recovery partition, the recovery benefit indicator of the node to be restored is calculated based on the electrical topology characteristic indicator and the available recovery power margin; based on the recovery benefit indicator of the node to be restored, the importance indicator of the node to be restored is calculated.

[0138] In this optional embodiment, when calculating the importance index of the node to be restored based on the recovery benefit index of the node to be restored, the node betweenness and the expected benefit can be normalized respectively; the importance of the node to be restored is calculated based on the normalized node betweenness and the expected benefit, and the importance of the node to be restored includes: the importance of the power generation node and the importance of the non-power generation node; based on the importance of the node to be restored, the nodes to be restored are sorted from large to small.

[0139] In order to facilitate understanding of the above technical solutions of the present invention, the above technical solutions of the present invention are further described below from the perspective of architecture and principle, as follows:

[0140] S1, obtains real-time grid operation data, power outage status, recoverable status, abnormality and alarm data;

[0141] S2, dynamically partition the power outage area of ​​the power grid into several restoration zones for parallel restoration;

[0142] S3, calculate the available restoration power margin of the whole network and each partition;

[0143] Based on the real-time operation data of the power grid, the real-time available recovery power margin of the entire grid is calculated according to formula (1):

[0144]

[0145] According to the real-time operation data of the power grid and the results of the restoration partition division, the real-time available restoration power margin of each restoration partition is calculated according to formula (2):

[0146]

[0147] Among them, η sys , η S,n The available recovery power margins of the whole network and the nth partition, respectively, n = 1, 2...N S , is the partition number, N S is the total number of partitions, are the currently available restored power of the whole network and the nth zone, respectively, and the sum of the spinning reserve capacity of stable power sources such as units, energy storage, etc. that are being restored and in operation within the whole network or zone n, and the power that can be supported by the external power grid; are the total amount of load to be restored in the whole network and the nth partition respectively;

[0148] The node refers to a power plant or a substation, the node to be restored refers to a power plant or a substation that is in a completely stopped state; the restoration partition refers to a connected set consisting of a number of power supply nodes, a number of nodes to be restored, and lines to be restored.

[0149] S4, for each restoration partition, calculate the electrical topology characteristic index of each node to be restored in the partition; calculate the node betweenness under the real-time power grid state according to formula (3):

[0150]

[0151] In the formula, is the betweenness of node m, m∈V, V is the set of nodes in the whole network; N 0,s,t is the number of shortest paths from node s to t, N 0,s,t (m) is the number of shortest paths between nodes s and t that pass through node m. To reflect the electrical characteristics of the network, the sum of the reactance and susceptance values ​​of each line converted to the same voltage level is taken as the weight of the line.

[0152] S5, for each recovery partition, evaluating the estimated value of the expected recovery benefit of the load of each node to be recovered in the partition;

[0153] For any recovery partition S n The mth node searches for the expected power supply range SP after the node is restored. m , further SP m Divided into S n Power supply range within and incremental recovery scope outside the partition SP Z,m ;

[0154] Assume that the evaluation starts at time t v,s , evaluation deadline t v,e , current time t v,c , t v,e =t v,s +T E , T E is the preset evaluation time, and the expected load recovery benefit estimate I of node m is calculated according to formula (4): B,L,m :

[0155]

[0156] In formula (4), tL,m is the average recovery time of the load in node m, based on the sum of the recovery operation time of the shortest path between node m and the power node T SP,m It is estimated that the process of picking up loads one by one is ignored; as shown in formula (5), N m It is partition S n Current available recovery power The total number of loads that can be restored in node m, N Z The remaining available recovery power is used to meet the load of node m. When the internal load is restored, the total number of loads that can be restored; P l,d , R l,d is the dth load to be restored at node m and its unit load restoration benefit; P l,f , R l,f This node The fth outage load and its unit load benefit within γ B,m,f is the delay correction factor, γ B,m,f >1, used to indicate that node m has recovered to its The delay time of the load f recovery at other nodes in the network is affected. If the node where the load f is located is a fully stopped node, then according to the current power grid status The sum of the recovery operation time T of the shortest path from this node to node m SP,m，f Estimation can be based on T SP,m，f Set the delay correction factor in sections, T SP,m，f The larger the γ B,j,f The greater the slope of the increase; if the node has been restored, then γ B,m,f =1;

[0157] R B,m is the inherent benefit of restoring node m. If node m is a partition boundary connected node, I conn,m is the expected benefit of inter-partition connectivity through node m;

[0158] Including S n The spinning reserve capacity of stable power sources such as units currently being restored and operated, energy storage, and the power that can be supported by the external power grid;

[0159]

[0160] As shown in formula (6), the capacity correction factor γ is introduced C,m to I B,L,m Make corrections so that the same I B,L,m Under these conditions, nodes with larger generation or transformation capacity have higher importance;

[0161] I′ B,L,m =γ C,m IB,L,m (6)

[0162] For the power generation node, partition S n The sum of the smallest node generator capacity C min,n As the base value, let C G,m is the sum of the unit capacities at node m, then we get:

[0163]

[0164] Where, 0<γ C,m <1, the larger the capacity, the closer it is to 1. For non-generation nodes, the generation capacity in formula (7) is replaced by the node main transformer capacity;

[0165] S6, for each recovery partition, calculating the extended available recovery power of each node to be recovered in the partition;

[0166] For the power generation node m′, the formula (8) used to calculate formula (4) is modified It is called the extended available recovery power of the generating node m′ and is denoted as And record the corrected load recovery benefit I′ G,L,m′ ;

[0167]

[0168] In formula (8), P G,m′ is the sum of the rated outputs of the units in the power generation node m′; γ B,S,m′ represents the recovery delay coefficient of the power generation node m′, S represents the recovery power node with the shortest path to the power generation node m′, if the power generation node m′ is the power generation node to be started, then γ B,S,m′ According to the distance between the power generation node m′ and S and the technical performance parameters of the units to be started in the power generation node m′, γ B,S,m′ ; If the power generation node m′ is a black start power node, then γ B,S,m′ The value is taken as the start-up delay correction coefficient of the black start unit, γ B,S,m′ , according to the technical performance parameters of the black start unit, the estimated value is fitted; N G is the node generating node m′ Total number of units waiting to be started, P G,f is the rated output of the fth unit, γ B,m′,f is the delay coefficient of unit f, calculated in the same way as γ B,S,m′ , γ B,m′,f >γ B,S,m′ ;

[0169] For non-generation node m″, evaluate according to formula (9): And record the corrected load recovery benefit as I″ B,L,m″ , obviously The value is better than non-generation nodes with no units or fewer units within the power supply range;

[0170]

[0171] In the formula, represents the extended available recovery power of the non-generation node m″, The current available recovery power of the nth recovery partition, N G,m″ represents the total number of units to be started within the power supply range of the non-generation node m″, P G,f represents the rated output of the fth unit; γ B,m″,f Indicates the delay coefficient of unit f

[0172] S7, for each recovery partition, calculating the extended incremental recovery range benefit of each node to be recovered in the partition;

[0173] Use the SP of node m Z,m The expected recovery benefits of the outage load To characterize its extended incremental recovery range benefit, as shown in formula (10);

[0174]

[0175] P l,f , R l,f It is SP Z,m The fth outage load and the corresponding unit load benefit value, N Z It is SP Z,m Total number of medium loads; γ B,m,f is through node m to SP Z,m The delay coefficient of power transmission at the node where the fth load is located, γ B,m,f ≥1;

[0176] S8, for each recovery partition, calculating the comprehensive load recovery benefit of each node to be recovered in the partition;

[0177] As shown in equations (11) and (12), the load recovery benefit and the extended incremental recovery range benefit are added to obtain the comprehensive load recovery benefit index of the power generation node: And the comprehensive load recovery benefit index of non-generation nodes

[0178]

[0179]

[0180] S9, for each recovery partition, calculate the expected recovery benefit of each node to be recovered in the partition under the disaster condition;

[0181] According to formula (13) and (14), the expected restoration benefits I of power generation nodes and non-power generation nodes are calculated. B,m ,I G,m ;

[0182]

[0183] Among them, C B,m′ represents the power generation cost of power generation node m′; C G,m″ represents the load restoration cost of the non-generation node m″;

[0184] The composition and influencing factors of the node's expected recovery benefits are as follows: Figure 4 As shown;

[0185] S10, for each recovery partition, calculating the importance index of each node to be recovered in the partition;

[0186] Use a unified node betweenness base value and expected recovery return base value I Base,L , respectively, for the power generation node betweenness Non-generation node betweenness and expected return I G,m″ ,I B,m′ Normalize it and record it as I' B,m′ and I' G,m″ , calculate the importance of power generation nodes and non-power generation nodes according to formula (15) and (16)

[0187]

[0188] Among them, ω1, ω2, ω3, ω4 are weights, ω1+ω2=1, ω3+ω4=1, represents the importance of non-generation node m′, represents the betweenness of non-generation node m′ after normalization, I′ B,m′ represents the expected restoration benefit of the non-generation node m′ after normalization, ω3 and ω4 represent the betweenness of the non-generation node m′ after normalization and the weight of the expected restoration benefit of the non-generation node m′ after normalization, respectively. represents the importance of non-generation node m″, represents the betweenness of non-generation node m″ after normalization, I G,m″ represents the expected restoration benefit of the non-generation node m″ after normalization, ω1 and ω2 represent the weights of the betweenness of the non-generation node m″ and the expected restoration benefit of the generation node m″ after normalization, respectively.

[0189] Figure 2 An embodiment of a power grid node restoration importance assessment system of the present invention is shown.

[0190] In this optional embodiment, the power grid node restoration importance assessment system includes:

[0191] A partitioning module 201 is used to determine the power outage area of ​​the power grid based on the acquired power grid monitoring status data, and divide the power outage area using a dynamic partitioning method to obtain a number of recovery partitions for parallel recovery; the power grid monitoring status data includes real-time operation data, power outage status, recoverable status and abnormal alarm data;

[0192] The available restoration power margin calculation module 203 is used to calculate the available restoration power margin of the entire network and each restoration partition according to the power grid monitoring status data;

[0193] The importance evaluation module 205 is used to evaluate the importance of the nodes to be restored in the restoration partition according to the multi-dimensional indicators of the nodes to be restored.

[0194] In this optional embodiment, the calculation formulas for calculating the available restoration power margin of the entire network and each restoration partition respectively according to the power grid monitoring status data are as follows:

[0195]

[0196] Where η sys , η s,n Respectively represent the available recovery power margin of the whole network and the nth recovery partition, n=1,2,…,N S , n represents the recovery partition number, N S Indicates the total number of recovery partitions. Represent the current available recovery power of the entire network and the nth recovery partition respectively, They represent the total amount of load to be restored in the entire network and the nth recovery partition respectively.

[0197] In this optional embodiment, for the node to be restored in the restoration partition, evaluating the importance of the restoration node according to the multi-dimensional indicators of the node to be restored includes:

[0198] Obtain the node set of the entire network, and calculate the electrical topology characteristic index of each node to be restored in the restoration partition, where the electrical topology characteristic index is the node betweenness under the real-time power grid state; for each node to be restored in the restoration partition, calculate the restoration benefit index of the node to be restored based on the electrical topology characteristic index and the available restoration power margin; calculate the importance index of the node to be restored based on the restoration benefit index of the node to be restored.

[0199] In this optional embodiment, the node set of the entire network is obtained, and the calculation formula for calculating the electrical topology characteristic index of each node to be restored in the restoration partition is:

[0200]

[0201] In the formula, represents the betweenness of node m, m∈V, V represents the set of nodes in the entire network; N 0,s,t represents the number of shortest paths from node s to t, N 0,s,t (m) represents the number of shortest paths from node s to t passing through node m.

[0202] In this optional embodiment, the restoration benefit index of the node to be restored includes: an estimated value of the expected load restoration benefit, extended available restoration power, extended incremental restoration range benefit, comprehensive load restoration benefit, and expected restoration benefit;

[0203] The calculation formula for the estimated value of the expected load recovery benefit is:

[0204]

[0205] In the formula, I B,L,m represents the estimated value of the expected load recovery benefit, t v,e represents the cut-off time for evaluating the estimated value of load recovery benefit, t v,c represents the current moment of load expected recovery benefit estimation, T E Indicates the preset evaluation duration, t L,m represents the average recovery time of the load in node m, N m Indicates recovery partition S n Current available recovery power The total number of loads that can be restored in node m, N Z P represents the total number of loads that can be restored when the remaining available restoration power is used to restore the load within the power supply range of node m while satisfying the load basis in node m; l,d , R l,d represents the dth load to be restored at node m and its unit load restoration benefit; P l,f , R l,f represents the fth outage load within the power supply range of node m and its unit load benefit; γ B,m,f represents the delay correction coefficient, γ B,m,f >1, used to represent the incremental recovery range SP of node m outside its partition Sn,m The delay time of the load f recovery at other nodes in the network is affected. If the node where the load f is located is a fully stopped node, then according to the current power grid status The sum of the recovery operation time T of the shortest path from this node to node m SP,m，f Estimation can be based on T SP,m，f Set the delay correction factor in sections, T SP,m，f The larger the γ B,j,fThe greater the slope of the increase; if the node has been restored, then γ B,m,f =1; R B,m represents the inherent benefit of restoring node m. If node m is a partition boundary connected node, I conn,m represents the expected benefit of inter-partition connectivity through node m;

[0206] The extended available restorable power includes: the extended available restorable power of the power generation node and the extended available restorable power of the non-power generation node;

[0207] The extended available restorable power of the power generation node refers to the calculation formula of the extended available restorable power when the node m is a power generation node:

[0208]

[0209] In the formula, represents the extended available recovery power of the generating node m′, P G,m′ represents the sum of the rated outputs of the units in the power generation node m′; γ B,S,m′ represents the recovery delay coefficient of the power generation node m′, S represents the recovery power node with the shortest path to the power generation node m′, and N G,m′ represents the total number of units to be started within the power supply range of the power generation node m′, P G,f represents the rated output of the fth unit; γ B,m′,f represents the delay coefficient of unit f;

[0210] The extended available restorable power of the non-power generation node refers to the calculation formula of the extended available restorable power when the node m is a non-power generation node:

[0211]

[0212] In the formula, represents the extended available recovery power of the non-generation node m″, The current available recovery power of the nth recovery partition, N G,m″ represents the total number of units to be started within the power supply range of the non-generation node m″, P G,f represents the rated output of the fth unit; γ B,m″,f represents the delay coefficient of unit f;

[0213] The comprehensive load recovery benefits include: comprehensive load recovery benefits of power generation nodes and comprehensive load recovery benefits of non-power generation nodes;

[0214] The comprehensive load recovery benefit of the power generation node refers to the calculation formula of the comprehensive load recovery benefit when the node m is a power generation node:

[0215]

[0216] In the formula, represents the comprehensive load recovery benefit of power generation node m′, I″ B,L,m′ represents the load recovery benefit after correction at the generation node m′; represents the benefit of extending the incremental recovery range of node m′;

[0217] The comprehensive load recovery benefit of the non-power generation node refers to the calculation formula of the comprehensive load recovery benefit when the node m is a non-power generation node:

[0218]

[0219] In the formula, represents the comprehensive load recovery benefit of non-generation node m″, I′ G,L,m″ represents the load recovery benefit after correction at the non-generation node m″; represents the benefit within the extended incremental restoration range of the non-generation node m″;

[0220] The expected recovery benefits include: the expected recovery benefits of power generation nodes and the expected recovery benefits of non-power generation nodes;

[0221] The expected recovery benefit of the power generation node refers to the calculation formula of the expected recovery benefit when the node m is a power generation node:

[0222]

[0223] In the formula, I B,m′ represents the expected recovery benefit of the power generation node m′, represents the comprehensive load recovery benefit of power generation node m′, C B,m′ represents the power generation cost of power generation node m′, η sys , η s,n They represent the available restoration power margin of the whole network and the nth restoration partition respectively;

[0224] The expected restoration benefit of the non-power generation node refers to the calculation formula of the expected restoration benefit when the node m is a non-power generation node:

[0225]

[0226] In the formula, I G,m″ represents the expected restoration benefit of the non-generation node m″, represents the comprehensive load recovery benefit of non-generation node m″, represents the comprehensive load recovery benefit of power generation node m′, C G,m″ represents the load restoration cost of non-generation node m″, η sys , η s,n Represent the available recovery power margin of the whole network and the nth recovery partition, IB,m′ It represents the expected recovery benefit of power generation node m′.

[0227] In this optional embodiment, based on the recovery benefit index of the node to be restored, calculating the importance index of the node to be restored includes:

[0228] The node betweenness and expected benefits are normalized respectively; the importance of the node to be restored is calculated according to the normalized node betweenness and expected benefits, and the importance of the node to be restored includes: the importance of the power generation node and the importance of the non-power generation node; based on the importance of the node to be restored, the nodes to be restored are sorted from large to small.

[0229] In this optional embodiment, the calculation formula of the power generation node importance is:

[0230]

[0231] In the formula, represents the importance of non-generation node m′, represents the betweenness of non-generation node m′ after normalization, I′ B,m′ represents the expected restoration benefit of the non-generation node m′ after normalization, ω3 and ω4 represent the betweenness of the non-generation node m′ after normalization and the weight of the expected restoration benefit of the non-generation node m′ after normalization, respectively.

[0232] The calculation formula of the importance of the non-power generation node is:

[0233]

[0234] In the formula, represents the importance of non-generation node m″, represents the betweenness of non-generation node m″ after normalization, I G,m″ represents the expected restoration benefit of the non-generation node m″ after normalization, ω1 and ω2 represent the weights of the betweenness of the non-generation node m″ and the expected restoration benefit of the generation node m″ after normalization, respectively.

[0235] In one embodiment, a computer device is provided. The computer device may be a server, and its internal structure diagram may be as follows: Figure 3As shown. The computer device includes a processor, a memory and a network interface connected through a system bus. Among them, the processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The database of the computer device is used to store static information and dynamic information data. The network interface of the computer device is used to communicate with an external terminal through a network connection. When the computer program is executed by the processor, the steps in the above method embodiment are implemented.

[0236] Those skilled in the art will understand that Figure 3 The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present invention, and does not constitute a limitation on the computer device to which the solution of the present invention is applied. The specific computer device may include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components.

[0237] In addition, the present invention also provides a computer device, including a memory and a processor, wherein a computer program is stored in the memory, and the processor implements the steps in the above method embodiment when executing the computer program.

[0238] In addition, the present invention further provides a computer-readable storage medium on which a computer program is stored. When the computer program is executed by a processor, the steps in the above method embodiment are implemented.

[0239] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, storage, database or other media used in the embodiments provided by the present invention can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory or optical memory, etc. Volatile memory can include random access memory (RAM) or external cache memory. As an illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM).

[0240] The present invention is not limited to the structures which have been described above and shown in the drawings, and various modifications and changes may be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

Claims

1. A method for evaluating the importance of power grid node restoration, characterized in that: include: Determine the power outage area of ​​the power grid based on the acquired power grid monitoring status data, divide the power outage area by using a dynamic partitioning method and obtain a number of restoration partitions for parallel restoration; The power grid monitoring status data includes real-time operation data, power outage status, recoverable status and abnormal alarm data; According to the power grid monitoring status data, the available restoration power margin of the whole network and each restoration zone is calculated respectively; For the nodes to be restored in the recovery partition, the importance of the restoration nodes is evaluated based on the multi-dimensional indicators of the nodes to be restored.

2. The method for evaluating the importance of power grid node restoration according to claim 1, characterized in that: The calculation formula for calculating the available restoration power margin of the entire network and each restoration partition respectively according to the power grid monitoring status data is: Where η sys , η s,n Respectively represent the available recovery power margin of the whole network and the nth recovery partition, n=1,2,…,N S , n represents the recovery partition number, N S Indicates the total number of recovery partitions. Represent the current available recovery power of the entire network and the nth recovery partition respectively, They represent the total amount of load to be restored in the entire network and the nth recovery partition respectively.

3. The method for evaluating the importance of power grid node restoration according to claim 2, characterized in that: For the node to be restored in the restoration partition, evaluating the importance of the restoration node according to the multi-dimensional indicators of the node to be restored includes: Obtaining a node set of the entire network, and calculating an electrical topology characteristic index of each node to be restored in the restoration partition, wherein the electrical topology characteristic index is a node betweenness under a real-time power grid state; For each node to be restored in each restoration partition, a restoration benefit index of the node to be restored is calculated based on an electrical topology characteristic index and an available restoration power margin; Based on the recovery benefit index of the node to be recovered, the importance index of the node to be recovered is calculated.

4. The method for evaluating the importance of power grid node restoration according to claim 3, characterized in that: The calculation formula for obtaining the node set of the entire network and calculating the electrical topology characteristic index of each node to be restored in the restoration partition is: In the formula, represents the betweenness of node m, m∈V, V represents the set of nodes in the entire network; N 0,s,t represents the number of shortest paths from node s to t, N 0,s,t (m) represents the number of shortest paths from node s to t passing through node m.

5. The method for evaluating the importance of power grid node restoration according to claim 3, characterized in that: The restoration benefit indicators of the node to be restored include: estimated load restoration benefit, extended available restoration power, extended incremental restoration range benefit, comprehensive load restoration benefit and expected restoration benefit; The calculation formula for the estimated value of the expected load recovery benefit is: In the formula, I B,L,m represents the estimated value of the expected load recovery benefit, t v,e represents the cut-off time for evaluating the estimated value of load recovery benefit, t v,c represents the current moment of load expected recovery benefit estimation, T E Indicates the preset evaluation duration, t L,m represents the average recovery time of the load in node m, N m Indicates recovery partition S n Current available recovery power The total number of loads that can be restored in node m, N Z P represents the total number of loads that can be restored when the remaining available restoration power is used to restore the load within the power supply range of node m while satisfying the load basis in node m; l,d , R l,d represents the dth load to be restored at node m and its unit load restoration benefit; P l,f , R l,f represents the fth outage load within the power supply range of node m and its unit load benefit; γ B,m,f Represents the delay correction factor, R B,m represents the inherent benefit of restoring node m. If node m is a partition boundary connected node, I conn,m represents the expected benefit of inter-partition connectivity through node m; The extended available restorable power includes: the extended available restorable power of the power generation node and the extended available restorable power of the non-power generation node; The extended available restorable power of the power generation node refers to the calculation formula of the extended available restorable power when the node m is a power generation node: In the formula, represents the extended available recovery power of the generating node m′, P G,m′ represents the sum of the rated outputs of the units in the power generation node m′; γ B,S,m′ represents the recovery delay coefficient of the power generation node m′, S represents the recovery power node with the shortest path to the power generation node m′, and N G,m′ represents the total number of units to be started within the power supply range of the power generation node m′, P G,f represents the rated output of the fth unit; γ B,m′,f represents the delay coefficient of unit f; The extended available restorable power of the non-power generation node refers to the calculation formula of the extended available restorable power when the node m is a non-power generation node: In the formula, represents the extended available recovery power of the non-generation node m″, The current available recovery power of the nth recovery partition, N G,m″ represents the total number of units to be started within the power supply range of the non-generation node m″, P G,f represents the rated output of the fth unit; γ B,m″,f represents the delay coefficient of unit f; The comprehensive load recovery benefits include: comprehensive load recovery benefits of power generation nodes and comprehensive load recovery benefits of non-power generation nodes; The comprehensive load recovery benefit of the power generation node refers to the calculation formula of the comprehensive load recovery benefit when the node m is a power generation node: In the formula, represents the comprehensive load recovery benefit of power generation node m′, I″ B,L,m′ represents the load recovery benefit after correction at the generation node m′; represents the benefit of extending the incremental recovery range of node m′; The comprehensive load recovery benefit of the non-power generation node refers to the calculation formula of the comprehensive load recovery benefit when the node m is a non-power generation node: In the formula, represents the comprehensive load restoration benefit of non-generation node m″, I' G,L,m″ represents the load recovery benefit after correction at the non-generation node m″; represents the benefit within the extended incremental restoration range of the non-generation node m″; The expected recovery benefits include: the expected recovery benefits of power generation nodes and the expected recovery benefits of non-power generation nodes; The expected recovery benefit of the power generation node refers to the calculation formula of the expected recovery benefit when the node m is a power generation node: In the formula, I B,m′ represents the expected recovery benefit of the power generation node m′, represents the comprehensive load recovery benefit of power generation node m′, C B,m′ represents the power generation cost of power generation node m′, η sys , η s,n They represent the available restoration power margin of the whole network and the nth restoration partition respectively; The expected restoration benefit of the non-power generation node refers to the calculation formula of the expected restoration benefit when the node m is a non-power generation node: In the formula, I G,m″ represents the expected restoration benefit of the non-generation node m″, represents the comprehensive load recovery benefit of non-generation node m″, represents the comprehensive load recovery benefit of power generation node m′, C G,m″ represents the load restoration cost of non-generation node m″, η sys , η s,n Represent the available recovery power margin of the whole network and the nth recovery partition, I B,m′ It represents the expected recovery benefit of power generation node m′.

6. The method for evaluating the importance of power grid node restoration according to claim 2, characterized in that: The calculation of the importance index of the node to be restored based on the restoration benefit index of the node to be restored includes: Normalize node betweenness and expected return respectively; Calculate the importance of the node to be restored according to the normalized node betweenness and expected benefits, where the importance of the node to be restored includes: the importance of the power generation node and the importance of the non-power generation node; Based on the importance of the nodes to be restored, the nodes to be restored are sorted from large to small.

7. The method for evaluating the importance of power grid node restoration according to claim 6, characterized in that: The calculation formula of the power generation node importance is: In the formula, represents the importance of non-generation node m′, represents the betweenness of non-generation node m′ after normalization, I′ B,m′ represents the expected restoration benefit of the non-generation node m′ after normalization, ω3 and ω4 represent the betweenness of the non-generation node m′ after normalization and the weight of the expected restoration benefit of the non-generation node m′ after normalization, respectively. The calculation formula of the importance of the non-power generation node is: In the formula, represents the importance of non-generation node m″, represents the betweenness of non-generation node m″ after normalization, I G,m″ represents the expected restoration benefit of the non-generation node m″ after normalization, ω1 and ω2 represent the weights of the betweenness of the non-generation node m″ and the expected restoration benefit of the generation node m″ after normalization, respectively.

8. A power grid node restoration importance assessment system, characterized in that: include: A partitioning module is used to determine the power outage area of ​​the power grid based on the acquired power grid monitoring status data, divide the power outage area by a dynamic partitioning method and obtain a number of recovery partitions for parallel recovery; the power grid monitoring status data includes real-time operation data, power outage status, recoverable status and abnormal alarm data; The available restoration power margin calculation module is used to calculate the available restoration power margin of the entire network and each restoration partition according to the power grid monitoring status data; The importance evaluation module is used to evaluate the importance of the nodes to be restored in the recovery partition according to the multi-dimensional indicators of the nodes to be restored.

9. The power grid node restoration importance evaluation system according to claim 8, characterized in that: The calculation formula for calculating the available restoration power margin of the entire network and each restoration partition respectively according to the power grid monitoring status data is: Where η sys , η s,n Respectively represent the available recovery power margin of the whole network and the nth recovery partition, n=1,2,…,N S , n represents the recovery partition number, N S Indicates the total number of recovery partitions. Represent the current available recovery power of the entire network and the nth recovery partition respectively, They represent the total amount of load to be restored in the entire network and the nth recovery partition respectively.

10. The power grid node restoration importance evaluation system according to claim 9, characterized in that: For the node to be restored in the restoration partition, evaluating the importance of the restoration node according to the multi-dimensional indicators of the node to be restored includes: Obtaining a node set of the entire network, and calculating an electrical topology characteristic index of each node to be restored in the restoration partition, wherein the electrical topology characteristic index is a node betweenness under a real-time power grid state; For each node to be restored in each restoration partition, a restoration benefit index of the node to be restored is calculated based on an electrical topology characteristic index and an available restoration power margin; Based on the recovery benefit index of the node to be recovered, the importance index of the node to be recovered is calculated.

11. The power grid node restoration importance evaluation system according to claim 10, characterized in that: The calculation formula for obtaining the node set of the entire network and calculating the electrical topology characteristic index of each node to be restored in the restoration partition is: In the formula, represents the betweenness of node m, m∈V, V represents the set of nodes in the entire network; N 0,s,t represents the number of shortest paths from node s to t, N 0,s,t (m) represents the number of shortest paths from node s to t passing through node m.

12. The power grid node restoration importance evaluation system according to claim 11, characterized in that: The restoration benefit indicators of the node to be restored include: estimated load restoration benefit, extended available restoration power, extended incremental restoration range benefit, comprehensive load restoration benefit and expected restoration benefit; The calculation formula for the estimated value of the expected load recovery benefit is: In the formula, I B,L,m represents the estimated value of the expected load recovery benefit, t v,e represents the cut-off time for evaluating the estimated value of load recovery benefit, t v,c represents the current moment of load expected recovery benefit estimation, T E Indicates the preset evaluation duration, t L,m represents the average recovery time of the load in node m, N m Indicates recovery partition S n Current available recovery power The total number of loads that can be restored in node m, N Z P represents the total number of loads that can be restored when the remaining available restoration power is used to restore the load within the power supply range of node m while satisfying the load basis in node m; l,d , R l,d represents the dth load to be restored at node m and its unit load restoration benefit; P l,f , R l,f represents the fth outage load within the power supply range of node m and its unit load benefit; γ B,m,f Represents the delay correction factor, R B,m represents the inherent benefit of restoring node m. If node m is a partition boundary connected node, I conn,m represents the expected benefit of inter-partition connectivity through node m; The extended available restorable power includes: the extended available restorable power of the power generation node and the extended available restorable power of the non-power generation node; The extended available restorable power of the power generation node refers to the calculation formula of the extended available restorable power when the node m is a power generation node: In the formula, represents the extended available recovery power of the generating node m′, P G,m′ represents the sum of the rated outputs of the units in the power generation node m′; γ B,S,m′ represents the recovery delay coefficient of the power generation node m′, S represents the recovery power node with the shortest path to the power generation node m′, and N G,m′ represents the total number of units to be started within the power supply range of the power generation node m′, P G,f represents the rated output of the fth unit; γ B,m′,f represents the delay coefficient of unit f; The extended available restorable power of the non-power generation node refers to the calculation formula of the extended available restorable power when the node m is a non-power generation node: In the formula, represents the extended available recovery power of the non-generation node m″, The current available recovery power of the nth recovery partition, N G,m″ represents the total number of units to be started within the power supply range of the non-generation node m″, P G,f represents the rated output of the fth unit; γ B,m″,f represents the delay coefficient of unit f; The comprehensive load recovery benefits include: comprehensive load recovery benefits of power generation nodes and comprehensive load recovery benefits of non-power generation nodes; The comprehensive load recovery benefit of the power generation node refers to the calculation formula of the comprehensive load recovery benefit when the node m is a power generation node: In the formula, represents the comprehensive load recovery benefit of power generation node m′, I″ B,L,m′ represents the load recovery benefit after correction at the generation node m′; represents the benefit of extending the incremental recovery range of node m′; The comprehensive load recovery benefit of the non-power generation node refers to the calculation formula of the comprehensive load recovery benefit when the node m is a non-power generation node: In the formula, represents the comprehensive load restoration benefit of non-generation node m″, I' G,L,m″ represents the load recovery benefit after correction at the non-generation node m″; represents the benefit within the extended incremental restoration range of the non-generation node m″; The expected recovery benefits include: the expected recovery benefits of power generation nodes and the expected recovery benefits of non-power generation nodes; The expected recovery benefit of the power generation node refers to the calculation formula of the expected recovery benefit when the node m is a power generation node: In the formula, I B,m′ represents the expected recovery benefit of the power generation node m′, represents the comprehensive load recovery benefit of power generation node m′, C B,m′ represents the power generation cost of power generation node m′, η sys , η s,n They represent the available restoration power margin of the whole network and the nth restoration partition respectively; The expected restoration benefit of the non-power generation node refers to the calculation formula of the expected restoration benefit when the node m is a non-power generation node: In the formula, I G,m″ represents the expected restoration benefit of the non-generation node m″, represents the comprehensive load recovery benefit of non-generation node m″, represents the comprehensive load recovery benefit of power generation node m′, C G,m″ represents the load restoration cost of non-generation node m″, η sys , η s,n Represent the available recovery power margin of the whole network and the nth recovery partition, I B,m′ It represents the expected recovery benefit of power generation node m′.

13. The power grid node restoration importance evaluation system according to claim 12, characterized in that: The calculation of the importance index of the node to be restored based on the restoration benefit index of the node to be restored includes: Normalize node betweenness and expected return respectively; Calculate the importance of the node to be restored according to the normalized node betweenness and expected benefits, where the importance of the node to be restored includes: the importance of the power generation node and the importance of the non-power generation node; Based on the importance of the nodes to be restored, the nodes to be restored are sorted from large to small.

14. The power grid node restoration importance evaluation system according to claim 13, characterized in that: The calculation formula of the power generation node importance is: In the formula, represents the importance of non-generation node m′, represents the betweenness of non-generation node m′ after normalization, I′ B,m′ represents the expected restoration benefit of the non-generation node m′ after normalization, ω3 and ω4 represent the betweenness of the non-generation node m′ after normalization and the weight of the expected restoration benefit of the non-generation node m′ after normalization, respectively. The calculation formula of the importance of the non-power generation node is: In the formula, represents the importance of non-generation node m″, represents the betweenness of non-generation node m″ after normalization, I G,m″ represents the expected restoration benefit of the non-generation node m″ after normalization, ω1 and ω2 represent the weights of the betweenness of the non-generation node m″ and the expected restoration benefit of the generation node m″ after normalization, respectively.

15. A computer device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 7 are implemented.

16. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 7 are implemented.

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