Simulation verification method and system for low-voltage load shedding adaptability of local power grid

Abstract

The invention discloses a simulation verification method for low-voltage load shedding adaptability of a local power grid, and relates to the related technical field of low-frequency low-voltage load shedding in dispatching operation of a power system. Comprising the following steps: determining three low-voltage load shedding adaptability simulation verification scenes and occurrence probabilities thereof according to the distribution condition of distributed power supplies in a local power grid; constructing a local power grid electromagnetic transient simulation model, establishing a simulation verification model of a low-voltage load shedding device control strategy, and constructing three local power grid low-voltage load shedding adaptive electromagnetic transient simulation verification models; simulating to obtain the voltage stability of the local power grid under a typical serious fault; and comprehensively evaluating the adaptability of the low-voltage load shedding strategy of the local power grid by combining the occurrence probability of the three low-voltage load shedding adaptability simulation verification scenes. The invention provides a method for verifying and evaluating the adaptability of the low-voltage load shedding control strategy of the high-permeability local power grid of the distributed power supply, and is favorable for guiding the formulation of the low-voltage load shedding strategy of the power grid containing the large-scale distributed power supply and the safe and stable operation of the system.

Description

Technical Field

[0001] The present invention relates to the technical field related to low-frequency and low-voltage load shedding in power system dispatching operation, and in particular to a simulation verification method and system for low-voltage load shedding adaptability of a local power grid. Background Art

[0002] With the active promotion of the "dual carbon" goals, new energy sources are connected to the grid on a large scale to replace traditional power sources, and the installed capacity of distributed power sources in the power grid continues to increase. In some local areas, the penetration rate of distributed power sources has reached 100%, and the phenomenon of backfeeding to the main grid has occurred. At the same time, due to the presence of distributed power sources in the removable feeders connected to the medium and low voltage load reduction devices in the power grid, the matching between the distributed power sources and the low-voltage load reduction control strategy of the power grid is poor. The adaptability of the low-voltage load reduction strategy of the power grid and the safe and stable operation of the power grid under serious faults face great challenges.

[0003] At present, the low-voltage load shedding control strategy is mostly simulated and verified by electromechanical simulation software. The grid is highly equivalent, and distributed power sources are often treated as equivalent loads. The simulation of low-voltage load shedding measurement is limited to high-voltage level merging, which makes it difficult to truly reflect the adaptability of low-voltage load shedding in the local grid under the current high penetration characteristics of distributed power sources. It is urgent to break through the more accurate simulation verification of the adaptability of low-voltage load shedding in the local grid. Summary of the invention

[0004] In view of the fact that existing electromechanical simulation software treats distributed power sources as equivalent loads, and the simulation of low-voltage load reduction measurement is limited to high-voltage level merging processing, it is difficult to truly reflect the adaptability of low-voltage load reduction in local power grids under the current high penetration characteristics of distributed power sources. The present invention is proposed.

[0005] Therefore, the problem to be solved by the present invention is how to construct an electromagnetic transient equivalent model of a local power grid for verifying the adaptability of a low-voltage load reduction strategy, and to simulate and verify the adaptability of the low-voltage load reduction strategy of the local power grid.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0007] In the first aspect, an embodiment of the present invention provides a simulation verification method for the adaptability of low-voltage load shedding of a local power grid, which includes obtaining the topological structure, operating conditions and configuration information of low-voltage load shedding devices within the control range of the local power grid, and determining three low-voltage load shedding adaptability simulation verification scenarios and their occurrence probabilities according to the distribution of distributed power sources in the local power grid; constructing an electromagnetic transient simulation model of the local power grid based on the topological structure, operating conditions and configuration information of low-voltage load shedding devices within the control range of the local power grid, and establishing a simulation verification model of the low-voltage load shedding device control strategy based on the electromagnetic transient simulation model of the local power grid and the three low-voltage load shedding adaptability simulation verification scenarios, and constructing three local power grid low-voltage load shedding adaptability electromagnetic transient simulation verification models; based on the three local power grid low-voltage load shedding adaptability electromagnetic transient simulation verification models, simulating and obtaining the voltage stability of the local power grid under typical severe faults; and comprehensively evaluating the adaptability of the low-voltage load shedding strategy of the local power grid based on the voltage stability of the local power grid under typical severe faults and the occurrence probabilities of the three low-voltage load shedding adaptability simulation verification scenarios.

[0008] As a preferred scheme of the simulation verification method of the low-voltage load shedding adaptability of the local power grid of the present invention, the configuration information of the low-voltage load shedding device includes the bus node name and node voltage level of the low-voltage load shedding device installation location, the rounds of low-voltage load shedding control strategy actions, the voltage threshold value of each round of actions, the delay time of each round of actions, the load shedding amount of each round and the voltage recovery target value after the low-voltage load shedding action, as well as the name and power of the removable feeder associated with the low-voltage load shedding device, and the name and node voltage level of the starting bus node to which the removable feeder is connected.

[0009] As a preferred solution of the simulation verification method for low-voltage load shedding adaptability of the local power grid of the present invention, wherein: determining three low-voltage load shedding adaptability simulation verification scenarios includes, according to the topological structure and operating conditions of the local power grid, determining the starting end bus node N connected to the removable feeder associated with the low-voltage load shedding device 3i The total number of feeders N 3i-l , name of removable feeder, name of non-removable feeder, net power of each feeder and the penetration rate of distributed generation According to the starting bus node N connected to the removable feeder 3i According to the distribution of distributed power sources, three simulation verification scenarios are determined. The three simulation verification scenarios are scenario 1, scenario 2 and scenario 3. When the starting bus node N connected to the removable feeder is 3i When the power of the distributed generation is 100% evenly distributed on all removable feeders, it is scenario 1; when the starting bus node N connected to the removable feeder 3iWhen 50% of the distributed generation power is evenly distributed on all removable feeders and 50% is evenly distributed on all non-removable feeders, it is scenario 2. When the starting bus node N connected to the removable feeder 3i When the power of the distributed generation is 100% evenly distributed on all non-removable feeders, it is scenario 3.

[0010] As a preferred solution of the simulation verification method of the low-voltage load shedding adaptability of the local power grid of the present invention, wherein: constructing the electromagnetic transient simulation model of the local power grid includes, according to the configuration information of the low-voltage load shedding device, the topological structure and operating conditions of the power grid, equalizing the 220kV and below voltage level power grids, when the 220kV node N 1i The lower-level power grid is not equipped with a low-voltage load reduction device, and the node N 1i All feeders in the lower grid are equivalent to one feeder connected to node N. 1i ; When 220kV node N 2i The lower-level power grid is equipped with a low-voltage load reduction device. For the lower-level power grid equipped with a low-voltage load reduction device, each feeder in the lower-level power grid is respectively connected to the starting bus node N to which the removable feeder is connected. 3i For the lower-level power grid that is not equipped with a low-voltage load reduction device, directly convert the lower-level power grid to the bus node N where the 220kV node is located. 2i .

[0011] As a preferred solution of the simulation verification method of the local power grid low voltage load shedding adaptability of the present invention, wherein: constructing the local power grid electromagnetic transient simulation model also includes: i The distributed power and load of each feeder are equal in value. The distributed power and load of each feeder are regarded as injected power nodes. The injected power of the distributed power is positive, and the injected power of the load is negative. They are injected into the equivalent node N together. i ; Based on equal value nodes N i Distributed power penetration rate and apparent net power Compute Node N i Active power of the next equivalent load Reactive power of equivalent load And the active power of the equivalent distributed generation Based on equal value nodes N i The apparent net power and equivalent node voltage Calculate the equivalent node N i The total impedance under When constructing a local power grid electromagnetic transient simulation model, the equivalent node N i The distributed power generation under this condition is simulated by using the single-machine equivalent method. The rated capacity of the distributed power generation unit is The power generated is P pv-1 According to the typical new energy unit with power generation capacity P pv-1 The impedance Z pv-1 , calculate the impedance of the equivalent distributed power source Combine equal value nodes N i The total impedance and the impedance of the equivalent distributed power source Calculate the impedance of an equivalent load The equivalent load simulation model uses power The impedance is to simulate the equivalent load.

[0012] As a preferred solution of the simulation verification method of the low-voltage load shedding adaptability of the local power grid of the present invention, wherein: based on the electromagnetic transient simulation model of the local power grid, a simulation verification model of the low-voltage load shedding device control strategy is established, including: based on the electromagnetic transient simulation model of the local power grid, a switch simulator Break is installed on the removable feeder associated with the kth round of action of the low-voltage load shedding control strategy. k , the initial state of the switch is closed, and the feeder cut off in the kth round is L k , the initial value of k is 1; the low voltage load reduction device measures the voltage effective value U of its configuration node i i , simulate its load reduction strategy in the simulation software. If the voltage RMS value U i Less than the load shedding voltage threshold U of the kth round thk , delay t k s, disconnect switch Break k , cut off the feeder L k ; Otherwise, switch Break k Keep the closed state and do not act; if the voltage effective value U of node i is monitored i Less than the voltage recovery target value U ig , then k=k+1, if k≤N k , and the voltage effective value U i Less than the load shedding voltage threshold U of the kth round thk , delay t k s, disconnect switch Break k , cut off the feeder L k ; Otherwise, switch Break k Keep closed and do not move; if k>N k , the low voltage load shedding device stops cutting off the feeder; if the voltage effective value U i Greater than or equal to the voltage recovery target value U ig , that is U i ≥U ig , the low voltage load reduction device stops cutting off the feeder.

[0013] As a preferred scheme of the simulation verification method for the adaptability of low-voltage load shedding of the local power grid of the present invention, wherein: the comprehensive evaluation of the adaptability of the low-voltage load shedding strategy of the local power grid includes, respectively simulating three simulation verification scenarios, obtaining time-domain simulation results under typical severe faults, and judging and recording the stability of the power grid under each verification scenario and its fault based on existing relevant standards; the strategy adaptability is evaluated from the two perspectives of voltage stability after the low-voltage load shedding strategy is activated and the voltage recovery target value, and h(s,v,r) is set as the strategy adaptability index under the simulation scenario s, voltage stability v, and voltage recovery value r. If the voltage is stable after the low-voltage load shedding strategy is activated, and the voltage recovers to the target value, it is considered that the low-voltage load shedding strategy is adapted under this operating mode, and at this time, h(s,v,r)=1 is recorded, otherwise, h(s,v,r)=0 is recorded; combined with the probability of occurrence of each scenario, the comprehensive evaluation index of the adaptability of the low-voltage load shedding strategy of the evaluation system is calculated. Comprehensive evaluation index of adaptability The calculation formula is as follows:

[0014]

[0015] in, represents the comprehensive evaluation index of adaptability, Represents the simulation scenario s i , Voltage stability Voltage recovery value Strategy adaptability indicators in the case of Represents the simulation scenario s i The probability of occurrence; When , it means that the low voltage load reduction strategy is not suitable.

[0016] In the second aspect, an embodiment of the present invention provides a simulation verification system for the adaptability of low-voltage load shedding of a local power grid, which includes a data collection module for obtaining the topological structure, operating conditions and configuration information of low-voltage load shedding devices within the control range of the local power grid, and determining three low-voltage load shedding adaptability simulation verification scenarios and their occurrence probabilities according to the distribution of distributed power sources in the local power grid; a model construction module for constructing an electromagnetic transient simulation model of the local power grid based on the topological structure, operating conditions and configuration information of low-voltage load shedding devices within the control range of the local power grid, using an equivalent modeling method, and based on the electromagnetic transient simulation model of the local power grid and the three low-voltage load shedding adaptability simulation verification scenarios, establishing a simulation verification model of the control strategy of the low-voltage load shedding device, and constructing three local power grid low-voltage load shedding adaptability electromagnetic transient simulation verification models; a simulation module for simulating and obtaining the voltage stability of the local power grid under typical severe faults based on the three local power grid low-voltage load shedding adaptability electromagnetic transient simulation verification models; an evaluation module for comprehensively evaluating the adaptability of the low-voltage load shedding strategy of the local power grid based on the voltage stability of the local power grid under typical severe faults and the occurrence probabilities of the three low-voltage load shedding adaptability simulation verification scenarios.

[0017] In a third aspect, an embodiment of the present invention provides a computer device, including a memory and a processor, wherein the memory stores a computer program, wherein: when the computer program instructions are executed by the processor, the steps of the simulation verification method for low-voltage load reduction adaptability of a local power grid as in the first aspect of the present invention are implemented.

[0018] In a fourth aspect, an embodiment of the present invention provides a computer-readable storage medium having a computer program stored thereon, wherein: when the computer program instructions are executed by a processor, the steps of the simulation verification method for low-voltage load reduction adaptability of a local power grid as in the first aspect of the present invention are implemented.

[0019] The beneficial effects of the present invention are as follows: based on the configuration overview of all low-voltage load shedding devices within the control range of the local power grid and the data on the operation mode of the local power grid, the present invention constructs an electromagnetic transient equivalent model of the local power grid for the adaptability verification of the low-voltage load shedding strategy, simulates the action behavior of the low-voltage load shedding device, and obtains the voltage stability characteristics of the system under typical severe faults of the local power grid through simulation verification. Further, based on the system simulation results and the probability of occurrence of the scenario under the low-voltage load shedding adaptability simulation verification scenario, the adaptability of the low-voltage load shedding strategy of the local power grid is comprehensively evaluated, and a method is provided for the adaptability verification and evaluation of the low-voltage load shedding control strategy of the local power grid with high penetration of distributed power sources, which is conducive to guiding the formulation of the low-voltage load shedding strategy of the power grid containing large-scale distributed power sources and the safe and stable operation of the system. The method proposed in the present invention is not limited to a certain simulation software, but is applicable to software based on all graphical modeling and simulation types. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 The flowchart of the simulation verification method for low-voltage load shedding adaptability of the local power grid is shown in FIG.

[0022] Figure 2 The equivalent schematic diagram of a local power grid without a low-voltage load reduction device is used to verify the low-voltage load reduction adaptability of the local power grid.

[0023] Figure 3 The equivalent schematic diagram of a local power grid equipped with a low-voltage load reduction device for the simulation verification method of the low-voltage load reduction adaptability of the local power grid is provided.

[0024] Figure 4 The present invention is a flow chart of low-voltage load shedding strategy verification for a simulation verification method of low-voltage load shedding adaptability of a local power grid. DETAILED DESCRIPTION

[0025] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0026] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0027] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0028] Example 1

[0029] Reference Figure 1 to Figure 4 , which is the first embodiment of the present invention, and provides a simulation verification method for low-voltage load shedding adaptability of a local power grid, comprising:

[0030] S1: Obtain the topological structure, operating conditions and configuration information of the low-voltage load reduction device within the control range of the local power grid, and determine three low-voltage load reduction adaptability simulation verification scenarios and their occurrence probabilities according to the distribution of distributed power sources in the local power grid.

[0031] Specifically, the configuration information of the low-voltage load shedding device obtained includes the bus node name and node voltage level of the installation location of the low-voltage load shedding device, the rounds of low-voltage load shedding control strategy actions, the voltage threshold value of each round of actions, the delay time of each round of actions, the load shedding amount of each round and the voltage recovery target value after the low-voltage load shedding action, the name and power of the removable feeder associated with the low-voltage load shedding device, and the name and node voltage level of the starting bus node to which it is connected.

[0032] Furthermore, for the 220kV bus node N without low voltage load reduction device, 1i (i=1,2,3…n1, n1 is the total number of 220kV nodes without low-voltage load shedding devices). When low-voltage load shedding devices are not configured in all lower-level power grids, obtain the node N. 1i The penetration rate of distributed power generation

[0033] Furthermore, for a 220kV bus node N equipped with a low-voltage load reduction device 2i (i=1,2,3…n2, n2 is the total number of 220kV nodes equipped with low-voltage load reduction devices in the lower-level power grid) (including the 220kV voltage level), obtain node N 2i Penetration rate of distributed generation in lower-level power grids and the bus node N where the removable feeder in the lower power grid is located 3i The penetration rate of distributed generation under (i=1,2,3…n3, n3 is the total number of bus nodes where the feeders can be cut off in the lower-level power grid)

[0034] Furthermore, node N i Equivalent active power of distributed generation Active power equivalent to load satisfy: in, For node N i The penetration rate of distributed power generation.

[0035] Furthermore, three low-voltage load shedding adaptability simulation verification scenarios are determined, including determining the bus node N where the removable feeder associated with the low-voltage load shedding device is located according to the topological structure and operating conditions of the local power grid. 3i The total number of feeders N 3i-l (including N 3i-lc Removable feeder lines and N 3i-lnc feeders that cannot be cut off) and the net power of each feeder According to the bus node N where the removable feeder is located 3i The penetration rate of distributed power generation The following three simulation verification scenarios are identified:

[0036] Scenario 1: Bus node N where the feeder is located can be cut off 3i The distributed power is 100% evenly distributed in N 3i-lc The power of distributed generation on each removable feeder is equal, and the jth (j=1,2,…N 3i-lc The distributed generation power under the removable feeders is The jth (j=1,2,…N 3i-lnc ) The power of the distributed generation under the non-removable feeder is 0, and the power of the jth (j=, 12,…N 3i-l The load power of the feeder is The low voltage load shedding adaptability simulation verification scenario 1 is formed, and the probability of occurrence of scenario 1 is ρ s1 .

[0037] Scenario 2: 50% of the DG power at bus node i where the removable feeder is located is evenly distributed on the removable load feeder, and 50% is evenly distributed on the non-removable feeder. The DG power on each removable feeder is equal, and the DG power on each non-removable feeder is also equal. 3i-l The power of distributed generation under the feeder is The jth (j=1,2,…N 3i-l The load power of the feeder is The low voltage load shedding adaptability simulation verification scenario 2 is formed, and the probability of occurrence of scenario 2 is ρ s2 ;

[0038] Scenario 3: The DG power at bus node i where the removable feeder is located is 100% evenly distributed on the non-removable load feeder. The DG power on each non-removable feeder is equal. 3i-lc The power of the distributed generation under the jth (j=1,2,…N3i-lnc) removable feeder is 0, and the power of the distributed generation under the jth (j=1,2,…N3i-lnc) non-removable feeder is The jth (j=1,2,…N 3i-l The load power of the feeder is The low voltage load shedding adaptability simulation verification scenario 3 is formed, and the probability of occurrence of scenario 3 is ρ s3 .

[0039] Furthermore, s1 , s2 , s3 Given by the grid operator based on experience and satisfying ρ s1 +ρ s2 +ρ s3 =1.

[0040] S2: According to the topological structure, operating conditions and configuration information of the low-voltage load shedding device within the control range of the local power grid, the equivalent modeling method is adopted to construct an electromagnetic transient simulation model of the local power grid. Based on the electromagnetic transient simulation model of the local power grid and three low-voltage load shedding adaptability simulation verification scenarios, a simulation verification model of the low-voltage load shedding device control strategy is established, and three local power grid low-voltage load shedding adaptability electromagnetic transient simulation verification models are constructed.

[0041] Specifically, if the 220kV node N 1i (i=1,2,3…n1, n1 is the total number of 220kV nodes without low-voltage load shedding device) If the lower-level power grid is not equipped with low-voltage load shedding device, all feeders in the lower-level power grid are directly regarded as one feeder and connected to the bus node N where the 220kV node is located. 1i ;

[0042] Furthermore, if the 220kV node N 2i (i=1,2,3…n2, n2 is the total number of 220kV nodes equipped with low-voltage load reduction devices in the lower-level power grid) The lower-level power grid is equipped with low-voltage load reduction devices. For the lower-level power grid equipped with low-voltage load reduction devices, the feeders of the lower-level power grid are respectively equalized to the removable feeder bus node N 3i (i=1,2,3…n3, n3 is the total number of starting bus nodes connected to the removable feeder in the lower-level power grid); for all the lower-level power grids that are not equipped with low-voltage load reduction devices, directly treat them as a feeder and connect them to the bus node N where the 220kV node is located. 2i .

[0043] Furthermore, the distributed power sources and loads under the equivalent nodes are respectively equalized, and the distributed power sources and loads under each feeder are regarded as injected power nodes. The injected power of the distributed power sources is positive, and the injected power of the loads is negative, and they are jointly injected into the equivalent nodes.

[0044] Preferably, if the lower-level power grid is equal to node N 1i , based on equivalent nodes N 1i Distributed power penetration rate and apparent net power Considering the normal operation of distributed power generation, the active output power is Reactive power is 0, calculation node N 1i Active power of the next equivalent load Reactive power for:

[0045]

[0046]

[0047] in, Represents the equivalent nodes N 1i The active power and reactive power of Represents node N 1i The active power of the load with the same value, Represents node N 1i The reactive power of the load of equal value, Represents equal value node N 1i The penetration rate of distributed power generation.

[0048] Furthermore, the active power of the equivalent distributed generation for:

[0049]

[0050] in, Represents equal value node N 1i The active power of the equivalent distributed generation is Represents equal value node N 1i The active power, Represents equal value node N 1i The penetration rate of distributed power generation.

[0051] Further, according to the node N 1i The apparent net power and equivalent node voltage Calculate the equivalent node N 1i The total impedance under The calculation formula is:

[0052]

[0053] in, Represents equal value node N 1i The total impedance under represents the equivalent node voltage, Represents node N 1i The apparent net power.

[0054] Furthermore, the equivalent node N 1i The distributed power supply under this condition is simulated by using the single machine equivalent method, and the rated capacity of the new energy single machine used in the modeling is The power generated is P pv-1 According to the power generation capacity of a single new energy unit, P pv-1 Impedance Impedance of equivalent distributed power source The calculation formula is:

[0055]

[0056] in, represents the impedance of the equivalent distributed power source, Indicates that the power generation capacity of a single new energy unit is P pv-1 The impedance when pv-1 Indicates the power generation, Represents equal value node N 1i The active power of the equivalent distributed generation.

[0057] Furthermore, combined with the equivalent node N 1i The total impedance and the impedance of the equivalent distributed power source Calculate the impedance of an equivalent load The calculation formula is:

[0058]

[0059] in, represents the impedance of the equivalent load, Represents equal value node N 1i The total impedance, Represents the impedance of the equivalent distributed power source.

[0060] Furthermore, the equivalent load simulation model uses a power of The impedance is to simulate the equivalent load.

[0061] Furthermore, if the lower-level power grid is equal to node N 3i , based on equivalent nodes N 3i Distributed power penetration rate and the jth (j=1,2,…N 3i-l ) feeder apparent net power For verification scenario 1, calculate the equivalent node N 3i Next j(j=1,2,…N 3i-l ) feeder lines with equal load active power and reactive power The formula is as follows:

[0062]

[0063]

[0064] in, They are equal value nodes N 3i Next j(j=1,2,…N 3i-l ) feeder active power and reactive power, Represents equal value node N 3i Next j(j=1,2,…N 3i-l ) feeder lines with equivalent load active power, Represents equal value node N 3i Next j(j=1,2,…N 3i-l ) feeder lines with equal load reactive power, Represents equal value node N 3i Distributed generation penetration rate, N 3i-lc Represents equal value node N 3i The total number of feeders that can be cut out.

[0065] Furthermore, the equivalent node N 3i Next j(j=1,2,…N 3i-lc ) active power of equivalent distributed generation on the removable feeder for:

[0066]

[0067] in, Indicates the jth (j=1,2,…N 3i-lc ) active power of equivalent distributed generation on the removable feeder, Represents equal value node N 3i Distributed generation penetration rate, N 3i-lc Represents equal value node N 3i The total number of removable feeders is Represents equal value node N 3i Next j(j=1,2,…N 3i-l ) feeder lines.

[0068] Further, according to the equivalent node N 3i Next j(j=1,2,…N 3i-l ) feeder apparent net power and equivalent node voltage Calculate the equivalent node N 3i Next j(j=1,2,…N 3i-l The total impedance of the feeder lines The formula is:

[0069]

[0070] Furthermore, the equivalent node N 3i Next j(j=1,2,…N 3i-lc ) disconnectable feeder equivalent to the impedance of the distributed power source for:

[0071]

[0072] in, Represents equal value node N 3i Next j(j=1,2,…N 3i-lc) disconnectable feeder equivalent to the impedance of the distributed power source, Indicates that the power generation capacity of a single new energy unit is P pv-1 The impedance when pv-1 It represents the equivalent power generation of a single unit using new energy. Represents equal value node N 3i Next j(j=1,2,…N 3i-lc ) can be cut off from the feeder line with the active power of the equivalent distributed power source.

[0073] Furthermore, the equivalent node N 3i Next j(j=1,2,…N 3i-lc ) impedance of the equivalent load of the cut-out feeder for:

[0074]

[0075] in, Represents equal value node N 3i Next j(j=1,2,…N 3i-lc ) impedance of the equivalent load of the cut-off feeder, Represents equal value node N 3i Next j(j=1,2,…N 3i-lc ) disconnectable feeder equivalent to the impedance of the distributed power source, Represents equal value node N 3i Next j(j=1,2,…N 3i-l ) feeder lines.

[0076] Furthermore, the equivalent node N 3i Next j(j=1,2,…N 3i-lnc ) Impedance of equivalent load of non-removable feeder for:

[0077]

[0078] in, Represents equal value node N 3i Next j(j=1,2,…N 3i-lnc ) of the non-removable feeder lines with equivalent load impedance, Represents equal value node N 3i Next j(j=1,2,…N 3i-l ) feeder lines.

[0079] Furthermore, the equivalent load simulation model uses a power of The impedance is to simulate the equivalent load.

[0080] Preferably, for verification scenario 2, calculate the equivalent node N3i Next j(j=1,2,…N 3i-lc ) active power of equivalent load on the removable feeder Reactive power The formula is as follows:

[0081]

[0082]

[0083] in, Represents equal value node N 3i Next j(j=1,2,…N 3i-lc ) active power of equivalent load on the removable feeder, Represents the equivalent nodes N 3i Next j(j=1,2,…N 3i-l ) feeder active power and reactive power, Represents equal value node N 3i Next j(j=1,2,…N 3i-lc ) of the feeder lines that can be cut off, Represents equal value node N 3i Distributed generation penetration rate, N 3i-lc Represents equal value node N 3i The total number of feeders that can be cut out.

[0084] Furthermore, the jth (j=1, 2, ... N 3i-lc ) active power of equivalent distributed generation on the removable feeder for:

[0085]

[0086] in, Represents equal value node N 3i Next j(j=1,2,…N 3i-lc ) active power of equivalent distributed generation on the removable feeder, Represents equal value node N 3i The penetration rate of distributed power generation, Represents equal value node N 3i Next j(j=1,2,…N 3i-l ) feeder active power, N 3i-lc Represents equal value node N 3i The total number of feeders that can be cut out.

[0087] Furthermore, the jth (j=1, 2, ... N 3i-lnc ) Active power of equivalent load on non-removable feeder lines Reactive power for:

[0088]

[0089]

[0090] in, Respectively represent the jth (j=1,2,…N 3i-lnc ) active power and reactive power of equivalent loads on the non-removable feeders, Represents equal value node N 3i Next j(j=1,2,…N 3i-l ) feeder active power, Represents equal value node N 3i Distributed generation penetration rate, N 3i-lnc Represents equal value node N 3i The total number of unremovable feeders, Represents equal value node N 3i Next j(j=1,2,…N 3i-l ) feeder lines.

[0091] Furthermore, the jth (j=1, 2, ... N 3i-lnc ) Active power of equivalent distributed generation on non-removable feeders for:

[0092]

[0093] in, Indicates the jth (j=1,2,…N 3i-lnc ) The active power of the equivalent distributed generation on the non-removable feeder, Represents equal value node N 3i Next j(j=1,2,…N 3i-l ) feeder active power, Represents equal value node N 3i Distributed generation penetration rate, N 3i-lnc Represents equal value node N 3i The total number of unremovable feeders.

[0094] Furthermore, the equivalent node N 3i Next j(j=1,2,…N 3i-l ) feeder equivalent load impedance for:

[0095]

[0096] in, Represents equal value node N 3i Next j(j=1,2,…N3i-l ) feeder equivalent load impedance, Represents equal value node N 3i Next j(j=1,2,…N 3i-l ) feeder equivalent impedance of distributed power source, Represents equal value node N 3i Next j(j=1,2,…N 3i-l ) feeder lines.

[0097] Furthermore, the calculation formula for equivalent impedance of distributed power sources and the models adopted for equivalent distributed power sources and loads are the same as those in scenario 1.

[0098] Furthermore, for verification scenario 3, the equivalent nodes N are calculated. 3i Next j(j=1,2,…N 3i-l ) feeder lines with equal load active power Reactive power for:

[0099]

[0100]

[0101] in, Represents the equivalent nodes N 3i Next j(j=1,2,…N 3i-l ) feeders with equal loads, Represents equal value node N 3i Next j(j=1,2,…N 3i-l ) feeder active power and reactive power, Represents equal value node N 3i Distributed generation penetration rate, N 3i-lnc Represents equal value node N 3i The total number of unremovable feeders.

[0102] Furthermore, the jth (j=1, 2, ... N 3i-lnc ) Active power of equivalent distributed generation on non-removable feeders for:

[0103]

[0104] in, Indicates the jth (j=1,2,…N 3i-lnc ) The active power of the equivalent distributed generation on the non-removable feeder, Represents equal value node N 3i The penetration rate of distributed power generation, Indicates the jth (j=1,2,…N) node under the equal value node N3i 3i-l ) feeders, N3i-lnc represents the total number of non-removable feeders under the equivalent node N3i.

[0105] Furthermore, the jth (j=1, 2, ... N) node under the equal value node N3i 3i-lnc ) non-removable feeder equivalent to the impedance of the distributed power source for:

[0106]

[0107] in, Represents equal value node N 3i Next j(j=1,2,…N 3i-lnc ) non-removable feeder equivalent to the impedance of the distributed power source, Indicates that the power generation capacity of a single new energy unit is P pv-1 The impedance when pv-1 It represents the equivalent power generation of a single unit using new energy. Represents equal value node N 3i Next j(j=1,2,…N 3i-lnc ) The active power of equivalent distributed generation on the non-removable feeder lines.

[0108] Furthermore, the equivalent node N 3i Next j(j=1,2,…N 3i-lc ) impedance of the equivalent load of the cut-out feeder for:

[0109]

[0110] in, Represents equal value node N 3i Next j(j=1,2,…N 3i-lc ) impedance of the equivalent load of the cut-off feeder, Represents equal value node N 3i Next j(j=1,2,…N 3i-lc ) of the cut-out feeder lines.

[0111] Furthermore, the equivalent node N 3i Next j(j=1,2,…N 3i-lnc ) Impedance of equivalent load of non-removable feeder for:

[0112]

[0113] in, Represents equal value node N 3i Next j(j=1,2,…N3i-lnc ) of the non-removable feeder lines with equivalent load impedance, Represents equal value node N 3i Next j(j=1,2,…N 3i-lnc ) non-removable feeder equivalent to the impedance of the distributed power source, Represents equal value node N 3i Next j(j=1,2,…N 3i-lnc ) total impedance of non-removable feeders.

[0114] Furthermore, the model used for equivalent distributed generation and load is the same as that in scenario 1.

[0115] Furthermore, if the lower-level power grid is equal to node N 2i , according to the equivalent node N 2i The apparent net power of all lower-level power grids that are not equipped with low-voltage load reduction devices All equivalent nodes N 3i Load power under and distributed power Compute Node N 2i The equivalent load active power of all lower-level power grids that are not equipped with low-voltage load reduction devices Reactive power for:

[0116]

[0117]

[0118] in, and Represents node N 2i The equivalent load active power and reactive power of all lower-level power grids that are not equipped with low-voltage load reduction devices, They are equal value nodes N 2i The active power and reactive power of all lower-level power grids that are not equipped with low-voltage load reduction devices, They are equal value nodes N 3i The active power of the load and the active power of the distributed generation, Represents equal value node N 2i The penetration rate of distributed power generation.

[0119] Furthermore, node N 2i The equivalent active power of distributed generation in all lower-level power grids without low-voltage load reduction devices for:

[0120]

[0121] in, N is the equivalent node 2i The active power of all lower-level power grids that are not equipped with low-voltage load reduction devices, They are equal value nodes N 3i The active power of the load and the active power of the distributed generation, Represents equal value node N 2i The penetration rate of distributed power generation.

[0122] Among them, the equivalent node N 2i The total impedance of all downstream power grids without low-voltage load reduction devices for:

[0123]

[0124] in, Represents equal value node N 2i The total impedance of all downstream power grids that are not equipped with low-voltage load reduction devices, Represents node N 2i The voltage amplitude, Represents equal value node N 2i The apparent net power of all lower-level power grids that are not equipped with low-voltage load reduction devices.

[0125] Furthermore, the equivalent node N 2i The impedance of the equivalent distributed power sources of all the lower-level power grids that are not equipped with low-voltage load reduction devices for:

[0126]

[0127] Further, Represents equal value node N 2i The impedance of the equivalent distributed power sources of all the lower-level power grids that are not equipped with low-voltage load reduction devices, Indicates that the power generation capacity of a single new energy unit is P pv-1 The impedance when pv-1 It represents the equivalent power generation of a single unit using new energy. Represents equal value node N 2i The active power of all lower-level power grids that are not equipped with low-voltage load reduction devices.

[0128] Furthermore, the equivalent node N 2i The equivalent load impedance of all lower-level power grids that are not equipped with low-voltage load reduction devices for:

[0129]

[0130] in, Represents equal value node N 2iThe equivalent load impedance of all lower-level power grids that are not equipped with low-voltage load reduction devices, Represents equal value node N 2i The total impedance of all downstream power grids that are not equipped with low-voltage load reduction devices, Represents equal value node N 2i The impedance of the equivalent distributed power sources of all downstream power grids that are not equipped with low-voltage load reduction devices.

[0131] Furthermore, the model used for equivalent distributed generation and load is the same as that in scenario 1.

[0132] Furthermore, a simulation verification model of the control strategy is established on all buses equipped with low-voltage load reduction devices to simulate the control execution logic, including:

[0133] Based on the electromagnetic transient simulation model of the local power grid, in the kth (k=1,2,…N) of the low voltage load reduction control strategy, k , N k Install a switch simulator Break on the removable feeder associated with the low voltage load shedding action k , the initial state of the switch is closed, and the feeder cut off in the kth round is L k , the initial value of k is 1;

[0134] The low voltage load reduction device detects the voltage effective value U of its configuration node i i , simulate its load reduction strategy in the simulation software (the voltage threshold U thk and delay t k Information): If the voltage RMS value U i Less than the load shedding voltage threshold U of the kth round thk , that is U i <U thk , delay t k s, disconnect switch Break k , cut off the feeder L k ; Otherwise, switch Break k Keep closed and do not move.

[0135] If the voltage effective value U of node i is monitored i Less than the voltage recovery target value U ig , that is U i <U ig , then k=k+1, if k≤N k , and the voltage effective value U i Less than the load shedding voltage threshold U of the kth round thk , delay t k s, disconnect switch Break k , cut off the feeder L k ; Otherwise, switch Breakk Keep closed and do not move; if k>N k , the low voltage load reduction device stops cutting off the feeder.

[0136] If the voltage effective value U of node i is monitored i Greater than or equal to the voltage recovery target value U ig , that is U i ≥U ig , the low voltage load reduction device stops cutting off the feeder.

[0137] S3: Based on three local power grid low-voltage load reduction adaptive electromagnetic transient simulation verification models, the voltage stability of the local power grid under typical severe faults is simulated.

[0138] Based on three simulation verification scenarios, typical severe faults are set up and time domain simulations are performed respectively. Based on the existing relevant standards, the grid stability under each verification scenario and its faults is judged and recorded.

[0139] S4: Based on the voltage stability of the local power grid under typical severe faults and the occurrence probability of three low-voltage load reduction adaptability simulation verification scenarios, the adaptability of the low-voltage load reduction strategy of the local power grid is comprehensively evaluated.

[0140] Specifically, the adaptability of the low-voltage load reduction strategy of the local power grid is comprehensively evaluated, including the strategy adaptability evaluation from two perspectives: voltage stability after the low-voltage load reduction strategy is activated and voltage recovery target value based on the simulation results of three simulation verification scenarios. h(s,v,r) is the strategy adaptability index under the simulation scenario s, voltage stability v, and voltage recovery value r. If the voltage is stable after the low-voltage load reduction strategy is activated and the voltage is restored to the target value, the low-voltage load reduction strategy is considered to be adapted under this operation mode, and h(s,v,r)=1 is recorded at this time. Otherwise, h(s,v,r)=0 is recorded.

[0141] Furthermore, combined with the probability calculation of each scenario, the adaptability comprehensive evaluation index of the low-voltage load reduction strategy of the evaluation system is obtained:

[0142]

[0143] in, represents the comprehensive evaluation index of adaptability, Represents the simulation scenario s i , Voltage stability Voltage recovery value Strategy adaptability indicators in the case of Represents the simulation scenario s i Probability of occurrence. Represents low voltage load shedding strategy adaptation; It represents maladaptation, and the smaller the value, the worse the adaptability.

[0144] Furthermore, at this time, the adaptability index of the low-voltage load reduction strategy under three simulation verification scenarios can be obtained, and simulation verification and comprehensive adaptability evaluation of the system low-voltage load reduction strategy can be carried out.

[0145] Example 2

[0146] Reference Figure 1 to Figure 4 , as an embodiment of the present invention, provides a simulation verification system for low-voltage load shedding adaptability of a local power grid, comprising:

[0147] The data collection module is used to obtain the topological structure, operating conditions and configuration information of the low-voltage load reduction device within the control range of the local power grid, and determine three low-voltage load reduction adaptability simulation verification scenarios and their occurrence probabilities according to the distribution of distributed power sources in the local power grid;

[0148] The model building module is used to build an electromagnetic transient simulation model of the local power grid based on the topological structure, operating conditions and configuration information of the low-voltage load shedding device within the control range of the local power grid, using the equivalent modeling method. Based on the electromagnetic transient simulation model of the local power grid and three low-voltage load shedding adaptability simulation verification scenarios, a simulation verification model of the low-voltage load shedding device control strategy is established, and three local power grid low-voltage load shedding adaptability electromagnetic transient simulation verification models are built;

[0149] The simulation module is used to verify the model based on three types of local power grid low-voltage load reduction adaptive electromagnetic transient simulations, and to simulate and obtain the voltage stability of the local power grid under typical severe faults;

[0150] The evaluation module is used to comprehensively evaluate the adaptability of the low-voltage load reduction strategy of the local power grid based on the voltage stability of the local power grid under typical severe faults and the occurrence probability of three low-voltage load reduction adaptability simulation verification scenarios.

[0151] For the specific definition of the simulation verification system for the adaptability of low-voltage load shedding of the local power grid, please refer to the definition of the simulation verification method for the adaptability of low-voltage load shedding of the local power grid mentioned above, which will not be repeated here. Each module in the above-mentioned simulation verification system for the adaptability of low-voltage load shedding of the local power grid can be implemented in whole or in part by software, hardware and a combination thereof. The above-mentioned modules can be embedded in or independent of the processor in the computer device in the form of hardware, or can be stored in the memory of the computer device in the form of software, so that the processor can call and execute the operations corresponding to the above modules.

[0152] Example 3

[0153] Refer to 1~ Figure 4, which is the third embodiment of the present invention, based on the first two embodiments, the embodiment of the present invention provides a computer device, which may be a server, and includes a processor, a memory, and a network interface connected via a system bus. 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.

[0154] The database of the computer device is used to store action detection 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 any of the above-mentioned sparse tensor operation acceleration method embodiments are implemented.

[0155] In one embodiment, an embodiment of the present invention 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 any of the above-mentioned sparse tensor operation acceleration method embodiments are implemented.

[0156] Those of ordinary skill 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 in this application can include at least one of non-volatile and volatile memory. Non-volatile memory may include read-only memory (ROM), magnetic tape, floppy disk, flash memory or optical memory, etc. Volatile memory may 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).

[0157] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A simulation verification method for low-voltage load shedding adaptability of a local power grid, characterized by: include, Obtain the topological structure, operating conditions and configuration information of the low-voltage load reduction device within the control range of the local power grid, and determine three low-voltage load reduction adaptability simulation verification scenarios and their occurrence probabilities according to the distribution of distributed power sources in the local power grid; According to the topological structure, operating conditions and configuration information of the low-voltage load shedding device within the control range of the local power grid, an equivalent modeling method is used to construct an electromagnetic transient simulation model of the local power grid. Based on the electromagnetic transient simulation model of the local power grid and three low-voltage load shedding adaptability simulation verification scenarios, a simulation verification model of the low-voltage load shedding device control strategy is established, and three local power grid low-voltage load shedding adaptability electromagnetic transient simulation verification models are constructed. Based on three local power grid low-voltage load shedding adaptive electromagnetic transient simulation verification models, the voltage stability of the local power grid under typical severe faults is simulated; According to the voltage stability of the local power grid under typical severe faults and combined with the occurrence probability of three low-voltage load reduction adaptability simulation verification scenarios, the adaptability of the low-voltage load reduction strategy of the local power grid is comprehensively evaluated.

2. The simulation verification method for low-voltage load shedding adaptability of a local power grid according to claim 1, characterized in that: The configuration information of the low-voltage load shedding device includes the bus node name and node voltage level of the low-voltage load shedding device installation location, the rounds of low-voltage load shedding control strategy actions, the voltage threshold value of each round of actions, the delay time of each round of actions, the load shedding amount of each round and the voltage recovery target value after the low-voltage load shedding action, as well as the name and power of the removable feeder associated with the low-voltage load shedding device, and the name and node voltage level of the starting bus node to which the removable feeder is connected.

3. The simulation verification method for low-voltage load shedding adaptability of a local power grid according to claim 2, characterized in that: The three low voltage load shedding adaptability simulation verification scenarios are determined to include: According to the topological structure and operating conditions of the local power grid, determine the starting bus node N to which the removable feeder associated with the low-voltage load reduction device is connected 3i The total number of feeders N 3i-l , name of removable feeder, name of non-removable feeder, net power of each feeder and the penetration rate of distributed generation According to the starting bus node N connected to the removable feeder 3i According to the distribution of distributed power sources, three simulation verification scenarios are determined. The three simulation verification scenarios are scenario 1, scenario 2 and scenario 3. When the starting bus node N connected to the removable feeder is 3i When the power of the distributed generation is 100% evenly distributed on all removable feeders, it is scenario 1; when the starting bus node N connected to the removable feeder 3i When 50% of the distributed generation power is evenly distributed on all removable feeders and 50% is evenly distributed on all non-removable feeders, it is scenario 2. When the starting bus node N connected to the removable feeder 3i When the power of the distributed generation is 100% evenly distributed on all non-removable feeders, it is scenario 3.

4. The simulation verification method for low-voltage load shedding adaptability of a local power grid according to claim 3, characterized in that: The construction of the local power grid electromagnetic transient simulation model includes: According to the configuration information of the low-voltage load reduction device, the topological structure and operating conditions of the power grid, the 220kV and below voltage level power grids are equalized. 1i The lower-level power grid is not equipped with a low-voltage load reduction device, and the node N 1i All feeders in the lower grid are equivalent to one feeder connected to node N. 1i ; When the 220kV node N 2i The lower-level power grid is equipped with a low-voltage load reduction device. For the lower-level power grid equipped with a low-voltage load reduction device, each feeder in the lower-level power grid is respectively connected to the starting bus node N to which the removable feeder is connected. 3i For the lower-level power grid that is not equipped with a low-voltage load reduction device, directly convert the lower-level power grid to the bus node N where the 220kV node is located. 2i .

5. The simulation verification method for low-voltage load shedding adaptability of a local power grid according to claim 4, characterized in that: The construction of the local power grid electromagnetic transient simulation model also includes: The equivalent node N i The distributed power and load of each feeder are equal in value. The distributed power and load of each feeder are regarded as injected power nodes. The injected power of the distributed power is positive, and the injected power of the load is negative. They are injected into the equivalent node N together. i ; Based on equal value nodes N i Distributed power penetration rate and apparent net power Compute Node N i Active power of the next equivalent load Reactive power of equivalent load And the active power of the equivalent distributed power generation Based on equal value nodes N i The apparent net power and equivalent node voltage Calculate the equivalent node N i The total impedance under When constructing the local power grid electromagnetic transient simulation model, the equivalent node N i The distributed power generation under this condition is simulated by using the single-machine equivalent method. The rated capacity of the distributed power generation unit is The power generated is P pv-1 According to the typical new energy unit with power generation capacity P pv-1 The impedance Z pv-1 , calculate the impedance of the equivalent distributed power source Combine equal value nodes N i The total impedance and the impedance of the equivalent distributed power source Calculate the impedance of an equivalent load The equivalent load simulation model uses power The impedance is to simulate the equivalent load.

6. The simulation verification method for low-voltage load shedding adaptability of a local power grid according to claim 5, characterized in that: The simulation verification model for establishing the control strategy of the low-voltage load reduction device based on the local power grid electromagnetic transient simulation model includes: Based on the electromagnetic transient simulation model of the local power grid, a switch simulator Break is installed on the removable feeder associated with the kth round of action of the low-voltage load reduction control strategy. k , the initial state of the switch is closed, and the feeder cut off in the kth round is L k , the initial value of k is 1; The low voltage load reduction device measures the voltage effective value U at its configuration node i i , simulate its load reduction strategy in the simulation software. If the voltage RMS value U i Less than the load shedding voltage threshold U of the kth round thk , delay t k s, disconnect switch Break k , cut off the feeder L k ; Otherwise, switch Break k Keep closed and do not move; If the voltage effective value U of node i is monitored i Less than the voltage recovery target value U ig , then k=k+1, if k≤N k , and the voltage effective value U i Less than the load shedding voltage threshold U of the kth round thk , delay t k s, disconnect switch Break k , cut off the feeder L k ; Otherwise, switch Break k Keep closed and do not move; if k>N k , the low voltage load shedding device stops cutting off the feeder; If the voltage effective value U of node i is monitored i Greater than or equal to the voltage recovery target value U ig , that is U i ≥U ig， The low voltage load reduction device stops cutting off the feeder.

7. The simulation verification method for low-voltage load shedding adaptability of a local power grid according to claim 6, characterized in that: The comprehensive evaluation of the adaptability of the low-voltage load reduction strategy of the local power grid includes: Simulate the three simulation verification scenarios respectively to obtain the time domain simulation results under typical severe faults. Based on the existing relevant standards, judge and record the grid stability under each verification scenario and its faults. The strategy adaptability is evaluated from the perspectives of voltage stability and voltage recovery target value after the low-voltage load reduction strategy is activated. Let h(s,v,r) be the strategy adaptability index under the simulation scenario s, voltage stability v, and voltage recovery value r. If the voltage is stable after the low-voltage load reduction strategy is activated and the voltage is restored to the target value, the low-voltage load reduction strategy is considered to be adapted under this operation mode. At this time, h(s,v,r)=1, otherwise, h(s,v,r)=0; Combined with the probability of occurrence of each scenario, the adaptability comprehensive evaluation index of the low-voltage load reduction strategy of the evaluation system is calculated. The adaptability comprehensive evaluation index The calculation formula is as follows: in, represents the comprehensive evaluation index of adaptability, Represents the simulation scenario s i , Voltage stability Voltage recovery value Strategy adaptability indicators in the case of Represents the simulation scenario s i Probability of occurrence; when When , it means that the low voltage load reduction strategy is not suitable.

8. A simulation verification system for low-voltage load shedding adaptability of a local power grid, based on the simulation verification method for low-voltage load shedding adaptability of a local power grid according to any one of claims 1 to 7, characterized in that: Also includes, The data collection module is used to obtain the topological structure, operating conditions and configuration information of the low-voltage load reduction device within the control range of the local power grid, and determine three low-voltage load reduction adaptability simulation verification scenarios and their occurrence probabilities according to the distribution of distributed power sources in the local power grid; The model building module is used to build an electromagnetic transient simulation model of the local power grid based on the topological structure, operating conditions and configuration information of the low-voltage load shedding device within the control range of the local power grid, using the equivalent modeling method. Based on the electromagnetic transient simulation model of the local power grid and three low-voltage load shedding adaptability simulation verification scenarios, a simulation verification model of the low-voltage load shedding device control strategy is established, and three local power grid low-voltage load shedding adaptability electromagnetic transient simulation verification models are built; The simulation module is used to verify the model based on three types of local power grid low-voltage load reduction adaptive electromagnetic transient simulations, and to simulate and obtain the voltage stability of the local power grid under typical severe faults; The evaluation module is used to comprehensively evaluate the adaptability of the low-voltage load reduction strategy of the local power grid based on the voltage stability of the local power grid under typical severe faults and the occurrence probability of three low-voltage load reduction adaptability simulation verification scenarios.

9. 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 simulation verification method for low-voltage load shedding adaptability of a local power grid as claimed in any one of claims 1 to 7 are implemented.

10. 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 simulation verification method for low-voltage load shedding adaptability of a local power grid as claimed in any one of claims 1 to 7 are implemented.

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