A simulation verification method and system for low-voltage load shedding adaptability of a local power grid

Abstract

The application discloses a kind of local power grid low voltage load shedding adaptability simulation verification method, it is related to the technical field of low frequency low voltage load shedding in power system dispatching operation, including according to the distribution of distributed power supply in local power grid, determine three low voltage load shedding adaptability simulation verification scene and its occurrence probability;Local power grid electromagnetic transient simulation model is constructed, the simulation verification model of low voltage load shedding device control strategy is established, three local power grid low voltage load shedding adaptability electromagnetic transient simulation verification model is constructed;Voltage stability of local power grid under typical serious fault is obtained by simulation;Combined with the occurrence probability of three low voltage load shedding adaptability simulation verification scene, the adaptability of local power grid low voltage load shedding strategy is comprehensively evaluated.The application provides a method for the adaptability verification and evaluation of distributed power supply high penetration local power grid low voltage load shedding control strategy, which is beneficial to guide the formulation of low voltage load shedding strategy of power grid containing large-scale distributed power supply and system safety and stable operation.

Description

TECHNICAL FIELD

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

[0002] New energy is 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 reaches 100%, and there is a phenomenon of reverse sending to the main grid. In addition, due to the presence of distributed power sources in the cuttable feeder to which the low-voltage load shedding device in the power grid is connected, the matching between the distributed power sources and the low-voltage load shedding control strategy of the power grid is poor. The adaptability of the low-voltage load shedding strategy and the safe and stable operation of the power grid under severe faults face great challenges.

[0003] Currently, the low-voltage load shedding control strategy is simulated and verified mainly by relying on mechanical and electrical simulation software. The power grid is highly equivalent, and the distributed power sources are often treated as equivalent loads. The simulation of low-voltage load shedding measurement is limited to high-voltage level merging processing, and it is difficult to truly reflect the adaptability of local power grid low-voltage load shedding under the current high-penetration characteristics of distributed power sources. It is urgent to break through the simulation verification of the adaptability of local power grid low-voltage load shedding. SUMMARY

[0004] In view of the problems that the existing mechanical and electrical simulation software treats the distributed power sources as equivalent loads, the simulation of low-voltage load shedding measurement is limited to high-voltage level merging processing, and it is difficult to truly reflect the adaptability of local power grid low-voltage load shedding under the current high-penetration characteristics of distributed power sources, the present application is proposed.

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

[0006] To solve the above technical problems, the present application provides the following technical solutions:

[0007] In a first aspect, an embodiment of the present application provides a simulation verification method for low-voltage load shedding adaptability of a local power grid, which comprises: obtaining topological structure, operating conditions and configuration information of low-voltage load shedding devices in a control range of the local power grid; 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 by using an equivalent modeling method according to the topological structure, operating conditions and configuration information of the low-voltage load shedding devices in the control range of the local power grid; establishing a simulation verification model of a control strategy of the low-voltage load shedding device 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 electromagnetic transient simulation verification models of the low-voltage load shedding adaptability of the local power grid; obtaining voltage stability of the local power grid under typical severe faults by simulation based on the three electromagnetic transient simulation verification models of the low-voltage load shedding adaptability of the local power grid; and comprehensively evaluating the adaptability of the low-voltage load shedding strategy of the local power grid according to the voltage stability of the local power grid under the 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 for low-voltage load shedding adaptability of the local power grid, the configuration information of the low-voltage load shedding device comprises bus node name and node voltage level of the installation site of the low-voltage load shedding device, action round of the low-voltage load shedding control strategy, voltage threshold value of each action round, delay time of each action round, load shedding amount of each round, voltage recovery target value after low-voltage load shedding action, and associated name and power of the excisable feeder of the low-voltage load shedding device, and name and node voltage level of the starting end bus node connected by the excisable feeder.

[0009] As a preferred scheme of the simulation verification method for low-voltage load shedding adaptability of the local power grid, the determination of the three low-voltage load shedding adaptability simulation verification scenarios comprises: determining the total number N 3i of feeders of the starting end bus node N 3i-l connected by the excisable feeder associated with the low-voltage load shedding device according to the topological structure and operating conditions of the local power grid, the name of the excisable feeder, the name of the non-excisable feeder, the net power S N3i-j of each feeder, and the penetration rate of the distributed power source. According to the distribution of the distributed power source of the starting end bus node N 3i connected by the excisable feeder, three simulation verification scenarios are determined, which are scenario 1, scenario 2 and scenario 3, respectively. When the power of the distributed power source of the starting end bus node N 3i connected by the excisable feeder is evenly distributed on all excisable feeders, it is scenario 1; when the power of the distributed power source of the starting end bus node N 3iScenario 2 occurs when 50% of the distributed power is evenly distributed across all switchable feeders and 50% is evenly distributed across all non-switched feeders; when the switchable feeder is connected to the starting bus node N... 3i Scenario 3 is defined as 100% of the distributed power is evenly distributed across all non-removable feeders.

[0010] As a preferred embodiment of the simulation verification method for the local power grid low-voltage load shedding adaptability of the present invention, the construction of the local power grid electromagnetic transient simulation model includes: based on the configuration information of the low-voltage load shedding device, the topology of the power grid, and the operating conditions, equipotentially simulating the 220kV and below voltage level power grid; when 220kV node N... 1i The downstream power grid is not equipped with low-voltage load shedding devices, and node N is directly connected. 1i All feeders in the downstream power grid are equivalent to a single feeder and are connected to node N. 1i When 220kV node N 2i The lower-level power grid is equipped with a low-voltage load shedding device. For the next lower-level power grid equipped with the low-voltage load shedding device, each feeder in the next lower-level power grid is connected to the starting bus node N of the disconnectable feeder. 3i For downstream power grids that are not equipped with low-voltage load shedding devices, the downstream power grid is directly equivalent to the bus node N where the 220kV node is located. 2i .

[0011] As a preferred embodiment of the simulation verification method for the low-voltage load shedding adaptability of the local power grid in this invention, the construction of the local power grid electromagnetic transient simulation model further includes, as shown by, the equivalent node N i The distributed generation and load of each feeder are equal in value. The distributed generation and load of each feeder are regarded as injected power nodes. The injected power of the distributed generation is positive, and the injected power of the load is negative. They are collectively injected into the equal value node N. i Based on equal nodes N i Distributed power penetration and net power Compute node N i Active power of the equivalent load Reactive power of equivalent load and the active power of equivalent distributed power sources Based on the equivalent node N i The apparent net power and equivalent node voltage Calculate the equivalent node N i Total impedance below When constructing a local power grid electromagnetic transient simulation model, the equivalent node N i The distributed power supply is simulated using the single-machine equivalent method, and the rated capacity of a single distributed power supply unit is... The power generation power is P pv-1 , according to the impedance Z pv-1 of the typical new energy single machine when the power generation power is P pv-1 , the impedance of the equivalent distributed power is calculated The total impedance of the equivalent node N i and the impedance of the equivalent distributed power are combined The impedance of the equivalent load is calculated The equivalent load simulation model uses an equivalent load with a power of and an impedance of to simulate.

[0012] As a preferred scheme of the simulation verification method for the adaptability of the low-voltage load shedding of the local power grid, based on the electromagnetic transient simulation model of the local power grid, the simulation verification model of the low-voltage load shedding device control strategy includes: based on the electromagnetic transient simulation model of the local power grid, a switch simulator Break k is installed on the removable feeder associated with the kth round of action of the low-voltage load shedding control strategy, the initial state of the switch is closed, and the feeder removed in the kth round is denoted as L k , and the initial value of k is 1; the low-voltage load shedding device monitors the effective value of the voltage U i at the configured node i, simulates the load shedding strategy in the simulation software, and if the effective value of the voltage U i is less than the load shedding voltage threshold U thk of the kth round, a delay t k s, the switch Break k is opened, and the feeder L k is removed; otherwise, the switch Break k remains in the closed state without action; if the effective value of the voltage U i at the node i is less than the voltage recovery target value U ig , k=k+1, if k≤N k , and the effective value of the voltage U i is less than the load shedding voltage threshold U thk of the kth round, a delay t k s, the switch Break k is opened, and the feeder L k is removed; otherwise, the switch Break k remains in the closed state without action; if k>N k , the low-voltage load shedding device stops removing the feeder; if the effective value of the voltage U i at the node i is greater than or equal to the voltage recovery target value U ig , i.e., U i ≥U ig , the low-voltage load shedding device stops removing the feeder.

[0013] ​As a preferred embodiment of the simulation verification method for the adaptability of local power grid low-voltage load shedding in this invention, the comprehensive evaluation of the adaptability of the local power grid low-voltage load shedding strategy includes: performing simulations for three simulation verification scenarios respectively, obtaining time-domain simulation results under typical severe faults, judging and recording the power grid stability under each verification scenario and its fault based on existing relevant standards; evaluating the adaptability of the strategy from two perspectives: voltage stability after the low-voltage load shedding strategy is implemented and the voltage recovery target value. Let h(s,v,r) be the strategy adaptability index under simulation scenario s, voltage stability v, and voltage recovery value r. If the voltage is stable after the low-voltage load shedding strategy is implemented and the voltage recovers to the target value, then the low-voltage load shedding strategy is considered to be adaptable under this operating mode, and h(s,v,r) = 1 is recorded; otherwise, h(s,v,r) = 0 is recorded; and calculating the comprehensive evaluation index of the adaptability of the low-voltage load shedding strategy of the evaluation system by combining the probability of occurrence of each scenario. Adaptability Comprehensive Assessment Indicators The calculation formula is as follows:

[0014]

[0015] in, Indicates the comprehensive assessment index of adaptability. Represents simulation scenario s i Voltage stability Voltage recovery value Indicators of strategy adaptability under different circumstances Represents simulation scenario s i The probability of occurrence; when When, it represents the adaptation of low-pressure load reduction strategy, when This indicates that the low-pressure load reduction strategy is not suitable.

[0016] In a second aspect, the embodiment of the present application provides a simulation verification system for low-voltage load shedding adaptability of a local power grid, which comprises a data collection module, configured to acquire topological structure, operating conditions and configuration information of low-voltage load shedding devices within a control range of the local power grid, and determine three simulation verification scenarios for low-voltage load shedding adaptability and their occurrence probabilities according to the distribution of distributed power sources in the local power grid; a model construction module, configured to construct an electromagnetic transient simulation model of the local power grid by using an equivalent modeling method according to the topological structure, operating conditions and configuration information of low-voltage load shedding devices within the control range of the local power grid, establish a simulation verification model for a control strategy of the low-voltage load shedding device based on the electromagnetic transient simulation model of the local power grid and the three simulation verification scenarios for low-voltage load shedding adaptability, and construct three electromagnetic transient simulation verification models for low-voltage load shedding adaptability of the local power grid; a simulation module, configured to simulate and obtain voltage stability of the local power grid under typical severe faults based on the three electromagnetic transient simulation verification models for low-voltage load shedding adaptability of the local power grid; and an evaluation module, configured to comprehensively evaluate the adaptability of the low-voltage load shedding strategy of the local power grid according to the voltage stability of the local power grid under the typical severe faults and the occurrence probabilities of the three simulation verification scenarios for low-voltage load shedding adaptability.

[0017] In a third aspect, the embodiment of the present application provides a computer device, comprising a memory and a processor, and the memory stores a computer program, wherein the computer program instructions are executed by the processor to implement the steps of the simulation verification method for low-voltage load shedding adaptability of a local power grid according to the first aspect of the present application.

[0018] In a fourth aspect, the embodiment of the present application provides a computer readable storage medium, which stores a computer program, wherein the computer program instructions are executed by the processor to implement the steps of the simulation verification method for low-voltage load shedding adaptability of a local power grid according to the first aspect of the present application.

[0019] The present application has the following beneficial effects: based on the configuration profiles of all low-voltage load shedding devices within the control range of the local power grid and the operating mode data of the local power grid, the present application constructs an electromagnetic transient equivalent model of the local power grid for low-voltage load shedding strategy adaptability verification, simulates the action behavior of the low-voltage load shedding device, and simulates and verifies to obtain the voltage stability characteristics of the system under typical severe faults of the local power grid. Further, based on the system simulation results under the low-voltage load shedding adaptability simulation verification scenarios and the occurrence probabilities of the scenarios, the adaptability of the low-voltage load shedding strategy of the local power grid is comprehensively evaluated, a method is provided for adaptability verification and evaluation of the low-voltage load shedding control strategy of the distributed power source high-penetration local power grid, and the present application 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 provided by the present application is not limited to a certain simulation software, but is applicable to all graphical modeling simulation software. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort.

[0021] Figure 1 Flow chart of the simulation verification method for the low-voltage load shedding adaptability of the local power grid.

[0022] Figure 2 Equivalent schematic diagram of the local power grid without the configured low-voltage load shedding device for the simulation verification method for the low-voltage load shedding adaptability of the local power grid.

[0023] Figure 3 Equivalent schematic diagram of the local power grid with the configured low-voltage load shedding device for the simulation verification method for the low-voltage load shedding adaptability of the local power grid.

[0024] Figure 4 Flow chart of the low-voltage load shedding strategy verification for the simulation verification method for the low-voltage load shedding adaptability of the local power grid. DETAILED DESCRIPTION

[0025] In order to make the above-mentioned objects, features and advantages of the present application more apparent and comprehensible, the specific embodiments of the present application will be described in detail below with reference to the drawings.

[0026] In the following description, many specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be practiced in other ways different from those described herein without departing from the scope of the present application, and those skilled in the art can make similar generalizations without departing from the scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0027] Secondly, the "one embodiment" or "embodiment" referred to herein means that the specific features, structures or characteristics can be included in at least one implementation of the present application. "In one embodiment" appearing in different places in the specification does not mean the same embodiment, nor is it an embodiment that is independent of or selected from other embodiments.

[0028] Embodiment 1

[0029] Reference Figures 1-4 For the first embodiment of the present application, the embodiment provides a simulation verification method for the low-voltage load shedding adaptability of the local power grid, comprising,

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

[0031] Specifically, the configuration information of the low-voltage load shedding device includes the bus node name and node voltage level of the installation location of the low-voltage load shedding device, the round of low-voltage load shedding control strategy action, the voltage threshold value of each round of action, the delay time of each round of action, 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 cut-off 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 220kV bus node N that is not equipped with a low-voltage load shedding device... 1i (i = 1, 2, 3…n1, where n1 is the total number of 220kV nodes without low-voltage load shedding devices), assuming no low-voltage load shedding devices are configured in any of the downstream power grids, obtain node N. 1i Penetration rate of distributed power generation

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

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

[0035] Furthermore, three low-voltage load shedding adaptability simulation verification scenarios were identified, including determining the bus node N where the disconnectable feeder associated with the low-voltage load shedding device is located, based on the local power grid topology and operating conditions. 3i The total number of feeders N 3i-l (including N) 3i-lc Cut-off feeder and N 3i-lnc (Non-cuttable feeder) and the net power of each feeder Based on the bus node N where the cut-off feeder is located 3i 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 supply is 100% evenly distributed across N. 3i-lc On each of the disconnectable feeders, the distributed power is equal. Let the power of the distributed source on each disconnectable feeder be denoted as j-th (j=1,2,…N). 3i-lc The distributed power supply on the disconnectable feeder is... The j-th (j=1,2,…N) 3i-lnc The distributed power on the non-removable feeder is 0, and the power of the j-th (j=1,2,…N) feeder is 0. 3i-l The load power of the feeder is Scenario 1 for low-pressure load shedding adaptive simulation verification is formed, and the probability of occurrence of scenario 1 is denoted as ρ. s1 .

[0037] Scenario 2: 50% of the distributed generation power under bus node i where the switchable feeder is located is evenly distributed on the switchable load feeder, and 50% is evenly distributed on the non-switched feeder. The distributed generation power on each switchable feeder is equal, and the distributed generation power on each non-switched feeder is also equal. Let j (j = 1, 2, ... N) be the distributed generation power of the load node i. 3i-l The distributed power supply on the feeder line is The j-th (j=1,2,…N) 3i-l The load power of the feeder is Scenario 2 for low-pressure load shedding adaptive simulation verification is formed, and the probability of occurrence of scenario 2 is denoted as ρ. s2 ;

[0038] Scenario 3: The distributed generation power under bus node i where the switchable feeder is located is 100% evenly distributed across the non-switched load feeders, and the distributed generation power on each non-switched feeder is equal. Let j (j=1,2,…N) be the distributed generation power of the load. 3i-lc The distributed power on the j-th (j=1,2,…N3i-lnc)-th non-removable feeder is 0, and the distributed power on the j-th (j=1,2,…N3i-lnc)-th non-removable feeder is... The j-th (j=1,2,…N) 3i-l The load power of the feeder is Scenario 3 for low-pressure load shearing adaptability is formed, and the probability of occurrence of scenario 3 is denoted as ρ. s3 .

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

[0040] S2: Based on the topology, operating conditions, and configuration information of low-voltage load shedding devices within the control range of the local power grid, an electromagnetic transient simulation model of the local power grid is constructed using the equivalent modeling method. Based on the electromagnetic transient simulation model of the local power grid and three adaptive low-voltage load shedding simulation verification scenarios, a simulation verification model of the control strategy of the low-voltage load shedding device is established, and three adaptive electromagnetic transient simulation verification models of low-voltage load shedding in the local power grid are constructed.

[0041] Specifically, if 220kV node N 1i (i = 1, 2, 3…n1, where n1 is the total number of 220kV nodes without low-voltage load shedding devices) If the lower-level grid does not have low-voltage load shedding devices, then all feeders in the lower-level grid are directly treated as a single feeder and connected to the bus node N where the 220kV node is located. 1i ;

[0042] Furthermore, if 220kV node N 2i (i = 1, 2, 3…n2, where n2 is the total number of 220kV nodes equipped with low-voltage load shedding devices in the lower-level power grid) The lower-level power grid is equipped with low-voltage load shedding devices. For the next lower-level power grid equipped with low-voltage load shedding devices, each feeder of the lower-level power grid is connected to the disconnectable feeder bus node N. 3i (i = 1, 2, 3…n3, where n3 is the total number of starting bus nodes connected to the disconnectable feeder in the lower-level power grid); for all lower-level power grids without low-voltage load shedding devices, they are directly treated as a single feeder and connected to bus node N where the 220kV node is located. 2i .

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

[0044] Preferably, if the lower-level power grid is equivalent to node N 1i Based on the equal node N 1i Distributed power penetration and net power Considering the active power output of the distributed power source during normal operation is Reactive power is 0, calculate node N. 1i Active power of the equivalent load reactive power for:

[0045]

[0046] in, Representing the equivalent nodes N respectively 1iActive power and reactive power, Represents node N 1i The active power of the equivalent load. Represents node N 1i Reactive power of the equivalent load, Represents the equivalent node N 1i The penetration rate of distributed power sources.

[0047] Furthermore, the active power of the equivalent distributed power source for:

[0048]

[0049] in, Represents the equivalent node N 1i The active power of the equivalent distributed generation, Represents the equivalent node N 1i active power, Represents the equivalent node N 1i The penetration rate of distributed power sources.

[0050] Furthermore, based on node N 1i The apparent net power and equivalent node voltage Calculate the equivalent node N 1i Total impedance below The calculation formula is:

[0051]

[0052] in, Represents the equivalent node N 1i The total impedance below, Represents the equivalent node voltage. Represents node N 1i The apparent net power.

[0053] Furthermore, the equivalent node N 1i The distributed power source under the given conditions is simulated using the single-machine equivalent method. The rated capacity of the new energy single machine used in the model is... Power generation is P pv-1 According to the power generation capacity of a single new energy unit of P... pv-1 impedance at time Impedance of equivalent distributed power source The calculation formula is:

[0054]

[0055] in, This represents the impedance of an equivalent distributed source. This indicates that a single new energy generator has a power generation capacity of P. pv-1 The impedance at time P pv-1 Indicates power generation capacity. Represents the equivalent node N 1i The active power of the lower equivalent distributed power source.

[0056] Furthermore, combining the equivalent nodes N 1i Total impedance and the impedance of the equivalent distributed source Calculate the impedance of the equivalent load The calculation formula is:

[0057]

[0058] in, The impedance representing the equivalent load. Represents the equivalent node N 1i Total impedance, This represents the impedance of an equivalent distributed power source.

[0059] Furthermore, the equivalent load simulation model uses a power of impedance is The equivalent load is used to simulate it.

[0060] Furthermore, if the lower-level power grid is equivalent to node N 3i Based on the equal node N 3i Distributed power penetration and the j-th (j=1,2,…N) 3i-l Apparent net power of the feeder For verification scenario 1, calculate the equivalent node N. 3i The j-th (j=1,2,…N) 3i-l Active power of equivalent load on feeder line and reactive power The formula is as follows:

[0061]

[0062] in, These are the equal value nodes N. 3i The j-th (j=1,2,…N) 3i-l The active and reactive power of each feeder. Represents the equivalent node N 3i The j-th (j=1,2,…N) 3i-l The active power of the equivalent load on the feeder line. Represents the equivalent node N 3i The j-th (j=1,2,…N) 3i-l The reactive power of the equivalent load on the feeder line. Represents the equivalent node N 3i Distributed power penetration rate, N 3i-lc Represents the equivalent node N 3i The total number of feeders that can be cut off.

[0063] Furthermore, the equivalent node N 3i The j-th (j=1,2,…N) 3i-lc The active power of the equivalent distributed power source on the cut-off feeder. for:

[0064]

[0065] in, Represents the j-th (j=1,2,…N) 3i-lc The active power of the equivalent distributed power source on the feeder can be cut off. Represents the equivalent node N 3i Distributed power penetration rate, N 3i-lc Represents the equivalent node N 3i The total number of feeders that can be cut off. Represents the equivalent node N 3i The j-th (j=1,2,…N) 3i-l The active power of the feeders.

[0066] Furthermore, based on the equivalent node N 3i The j-th (j=1,2,…N) 3i-l Apparent net power of the feeder and equivalent node voltage Calculate the equivalent node N 3i The j-th (j=1,2,…N) 3i-l Total impedance of the feeders The formula is:

[0067]

[0068] Furthermore, the equivalent node N 3i The j-th (j=1,2,…N) 3i-lc The impedance of a cut-off feeder equivalent to a distributed source for:

[0069]

[0070] in, Represents the equivalent node N 3i The j-th (j=1,2,…N) 3i-lc The impedance of a cut-off feeder is equivalent to that of a distributed source. This indicates that a single new energy generator has a power generation capacity of P. pv-1 The impedance at time Ppv-1 Pj (N) represents the equivalent generation power of the new energy single machine, Pj (N) represents the equivalent generation power of the new energy single machine, 3i Pj (N) represents the equivalent generation power of the new energy single machine, 3i-lc Pj (N) represents the equivalent generation power of the new energy single machine,

[0071] Further, the equivalent node N 3i Pj (N) represents the equivalent generation power of the new energy single machine, 3i-lc Pj (N) represents the equivalent generation power of the new energy single machine, Pj (N) represents the equivalent generation power of the new energy single machine,

[0072]

[0073] Pj (N) represents the equivalent generation power of the new energy single machine, Pj (N) represents the equivalent generation power of the new energy single machine, 3i Pj (N) represents the equivalent generation power of the new energy single machine, 3i-lc Pj (N) represents the equivalent generation power of the new energy single machine, Pj (N) represents the equivalent generation power of the new energy single machine, 3i Pj (N) represents the equivalent generation power of the new energy single machine, 3i-lc Pj (N) represents the equivalent generation power of the new energy single machine, Pj (N) represents the equivalent generation power of the new energy single machine, 3i Pj (N) represents the equivalent generation power of the new energy single machine, 3i-l Pj (N) represents the equivalent generation power of the new energy single machine,

[0074] Further, the equivalent node N 3i Pj (N) represents the equivalent generation power of the new energy single machine, 3i-lnc Pj (N) represents the equivalent generation power of the new energy single machine, Pj (N) represents the equivalent generation power of the new energy single machine,

[0075]

[0076] Pj (N) represents the equivalent generation power of the new energy single machine, Pj (N) represents the equivalent generation power of the new energy single machine, 3i Pj (N) represents the equivalent generation power of the new energy single machine, 3i-lnc Pj (N) represents the equivalent generation power of the new energy single machine, Pj (N) represents the equivalent generation power of the new energy single machine, 3i Pj (N) represents the equivalent generation power of the new energy single machine, 3i-l Pj (N) represents the equivalent generation power of the new energy single machine,

[0077] Further, the equivalent load simulation model uses the equivalent load with power impedance to simulate.

[0078] Preferably, for verification scenario 2, the active power of the equivalent load on the jth (j=1, 2, …N 3i Pj (N) represents the equivalent generation power of the new energy single machine, 3i-lc Pj (N) represents the equivalent generation power of the new energy single machine, reactive power The formula is as follows:

[0079]

[0080] in, Represents the equivalent node N 3i The j-th (j=1,2,…N) 3i-lc One can cut off the active power of the equivalent load on the feeder. Representing the equivalent nodes N respectively 3i The j-th (j=1,2,…N) 3i-l The active and reactive power of each feeder. Represents the equivalent node N 3i The j-th (j=1,2,…N) 3i-lc The reactive power of the feeder can be cut off from the equivalent load on the feeder. Represents the equivalent node N 3i Distributed power penetration rate, N 3i-lc Represents the equivalent node N 3i The total number of feeders that can be cut off.

[0081] Furthermore, the j-th (j=1,2,…N) 3i-lc The active power of the equivalent distributed power source on the cut-off feeder. for:

[0082]

[0083] in, Represents the equivalent node N 3i The j-th (j=1,2,…N) 3i-lc The active power of the equivalent distributed power source on the feeder can be cut off. Represents the equivalent node N 3i Distributed power penetration rate Represents the equivalent node N 3i The j-th (j=1,2,…N) 3i-l The active power of the feeder, N 3i-lc Represents the equivalent node N 3i The total number of feeders that can be cut off.

[0084] Furthermore, the j-th (j=1,2,…N) 3i-lnc Active power of equivalent load on non-removable feeders reactive power for:

[0085]

[0086] in, They represent the j-th (j=1,2,…N)3i-lnc The active and reactive power of the equivalent load on the non-cut-off feeder. Represents the equivalent node N 3i The j-th (j=1,2,…N) 3i-l The active power of the feeder Represents the equivalent node N 3i Distributed power penetration rate, N 3i-lnc Represents the equivalent node N 3i The total number of non-removable feeders. Represents the equivalent node N 3i The j-th (j=1,2,…N) 3i-l The reactive power of the feeders.

[0087] Furthermore, the j-th (j=1,2,…N) 3i-lnc The active power of the equivalent distributed generation on the non-removable feeder for:

[0088]

[0089] in, Represents the j-th (j=1,2,…N) 3i-lnc The active power of the equivalent distributed source on the non-removable feeder. Represents the equivalent node N 3i The j-th (j=1,2,…N) 3i-l The active power of the feeder Represents the equivalent node N 3i Distributed power penetration rate, N 3i-lnc Represents the equivalent node N 3i The total number of feeders that cannot be cut off.

[0090] Furthermore, the equivalent node N 3i The j-th (j=1,2,…N) 3i-l Impedance of equivalent load for each feeder for:

[0091]

[0092] in, Represents the equivalent node N 3i The j-th (j=1,2,…N) 3i-l The impedance of the equivalent load of the feeder line. Represents the equivalent node N 3i The j-th (j=1,2,…N) 3i-l The impedance of the equivalent distributed source for each feeder. Represents the equivalent node N 3i The j-th (j=1,2,…N)3i-l The total impedance of the feeders.

[0093] Furthermore, the formula for calculating the equivalent impedance of distributed power sources, and the models used for equivalent distributed power sources and loads are the same as in scenario 1.

[0094] Furthermore, for verification scenario 3, calculate the equivalent node N. 3i The j-th (j=1,2,…N) 3i-l Active power of equivalent load on feeder line reactive power for:

[0095]

[0096] in, Representing the equivalent nodes N respectively 3i The j-th (j=1,2,…N) 3i-l The active and reactive power of the equivalent load on the feeder line. Represents the equivalent node N 3i The j-th (j=1,2,…N) 3i-l The active and reactive power of each feeder. Represents the equivalent node N 3i Distributed power penetration rate, N 3i-lnc Represents the equivalent node N 3i The total number of feeders that cannot be cut off.

[0097] Furthermore, the j-th (j=1,2,…N) 3i-lnc The active power of the equivalent distributed generation on the non-removable feeder for:

[0098]

[0099] in, Represents the j-th (j=1,2,…N) 3i-lnc The active power of the equivalent distributed source on the non-removable feeder. Represents the equivalent node N 3i Distributed power penetration rate Represents the equivalent node N 3i The j-th (j=1,2,…N) 3i-l The active power of the feeder, N 3i-lnc Represents the equivalent node N 3i The total number of feeders that cannot be cut off.

[0100] Furthermore, the equivalent node N 3i The j-th (j=1,2,…N) 3i-lnc Impedance of an equivalent distributed source for a non-removable feeder is:

[0101]

[0102] wherein, denotes the impedance of the equivalent node N 3i the jth(j=1,2,…N 3i-lnc non-separable feeder equivalent distributed generator, denotes the impedance of the new energy single machine when the power is P pv-1 , P pv-1 denotes the power of the equivalent new energy single machine, denotes the active power of the equivalent node N 3i the jth(j=1,2,…N 3i-lnc non-separable feeder equivalent distributed generator.

[0103] Further, the impedance of the equivalent node N 3i the jth(j=1,2,…N 3i-lc non-separable feeder equivalent load is:

[0104]

[0105] wherein, denotes the impedance of the equivalent node N 3i the jth(j=1,2,…N 3i-lc non-separable feeder equivalent load, denotes the total impedance of the equivalent node N 3i the jth(j=1,2,…N 3i-lc non-separable feeder.

[0106] Further, the impedance of the equivalent node N 3i the jth(j=1,2,…N 3i-lnc non-separable feeder equivalent load is:

[0107]

[0108] wherein, denotes the impedance of the equivalent node N 3i the jth(j=1,2,…N 3i-lnc non-separable feeder equivalent load, denotes the impedance of the equivalent node N 3i the jth(j=1,2,…N 3i-lnc non-separable feeder equivalent distributed generator, denotes the impedance of the equivalent node N 3i the jth(j=1,2,…N3i-lnc The total impedance of the non-cut-off feeders.

[0109] Furthermore, the equivalent distributed power source and load adopt the same model as in scenario 1.

[0110] Furthermore, if the lower-level power grid is equivalent to node N 2i According to the equivalent node N 2i Apparent net power of all downstream grids without low-voltage load shedding devices All equal nodes N 3i Load power under and distributed power Compute node N 2i The equivalent load active power of all downstream power grids that are not equipped with low-voltage load shedding devices reactive power for:

[0111]

[0112] in, and Representing node N respectively 2i The equivalent load active and reactive power of all downstream power grids that are not equipped with low-voltage load shedding devices. These are the equal value nodes N. 2i The active and reactive power of all downstream power grids that are not equipped with low-voltage load shedding devices. These are the equal value nodes N. 3i Active power under load and active power of distributed generation. Represents the equivalent node N 2i The penetration rate of distributed power sources.

[0113] Furthermore, node N 2i The equivalent active power of distributed generation in all downstream power grids that are not equipped with low-voltage load shedding devices for:

[0114]

[0115] in, For the iso-node N 2i The active power of all downstream power grids that are not equipped with low-voltage load shedding devices. These are the equal value nodes N. 3i Active power under load and active power of distributed generation. Represents the equivalent node N 2i The penetration rate of distributed power sources.

[0116] Among them, the equivalent node N 2iThe total impedance of all downstream power grids that are not equipped with low-voltage load shedding devices for:

[0117]

[0118] in, Represents the equivalent node N 2i The total impedance of all downstream power grids that are not equipped with low-voltage load shedding devices. Represents node N 2i voltage amplitude, Represents the equivalent node N 2i The apparent net power of all downstream grids that are not equipped with low-voltage load shedding devices.

[0119] Furthermore, the equivalent node N 2i The equivalent distributed generation impedance of all downstream grids that do not have low-voltage load shedding devices for:

[0120]

[0121] Furthermore, Represents the equivalent node N 2i The impedance of the equivalent distributed generation sources in all downstream power grids that are not equipped with low-voltage load shedding devices. This indicates that a single new energy unit has a power generation capacity of P. pv-1 The impedance at time P pv-1 This represents the equivalent power generation capacity of a single renewable energy unit. Represents the equivalent node N 2i The active power of all downstream power grids that are not equipped with low-voltage load shedding devices.

[0122] Furthermore, the equivalent node N 2i Equivalent load impedance of all downstream power grids that are not equipped with low-voltage load shedding devices for:

[0123]

[0124] in, Represents the equivalent node N 2i The equivalent load impedance of all downstream power grids that are not equipped with low-voltage load shedding devices. Represents the equivalent node N 2i The total impedance of all downstream power grids that are not equipped with low-voltage load shedding devices. Represents the equivalent node N 2i The impedance of the equivalent distributed generation of all downstream power grids that are not equipped with low-voltage load shedding devices.

[0125] Further, the model of equivalent distributed power and load is the same as scenario 1.

[0126] Further, the simulation verification model of the control strategy of all buses equipped with low-voltage load shedding devices is established, the control execution logic is simulated, including,

[0127] Based on the local power grid electromagnetic transient simulation model, the switch simulator Break k is installed on the switchable feeder associated with the kth(k = 1, 2, …N k (k = 1, 2, …N k (k = 1, 2, …N k (k = 1, 2, …N

[0128] The low-voltage load shedding device detects the effective value of the voltage U i at the configured node i, simulates the load shedding strategy (information of the voltage threshold U thk and the delay t k ) in the simulation software: if the effective value of the voltage U i is less than the voltage threshold U thk of the kth round of load shedding, i.e., U i <U thk , the switch Break k is opened after the delay t k , and the feeder L k is cut off; otherwise, the switch Break k remains closed and does not act.

[0129] If the effective value of the voltage U i at the node i is less than the voltage recovery target value U ig , i.e., U i <U ig , k = k + 1, if k ≤ N k , and the effective value of the voltage U i is less than the voltage threshold U thk of the kth round of load shedding, the switch Break k is opened after the delay t k , and the feeder L k is cut off; otherwise, the switch Break k remains closed and does not act; if k > N k , the low-voltage load shedding device stops cutting off the feeder.

[0130] If the effective value of the voltage U i at the node i is greater than or equal to the voltage recovery target value U ig , i.e., U i ≥ U igIf the voltage of the power grid is lower than the low-voltage cut-off value, the low-voltage cut-off device stops cutting off the feeder.

[0131] S3: Based on three local power grid low-voltage cut-off adaptive electromagnetic transient simulation verification models, the voltage stability of the local power grid under a typical severe fault is simulated.

[0132] Based on the three simulation verification scenarios, a typical severe fault is set, time-domain simulation is respectively performed, and based on the existing relevant standards, the stability of the power grid under each verification scenario and fault is judged and recorded.

[0133] S4: According to the voltage stability of the local power grid under a typical severe fault, combined with the occurrence probability of the three low-voltage cut-off adaptive simulation verification scenarios, the adaptability of the low-voltage cut-off strategy of the local power grid is comprehensively evaluated.

[0134] Specifically, the adaptability of the low-voltage cut-off strategy of the local power grid is comprehensively evaluated, including strategy adaptability evaluation from the voltage stability after the low-voltage cut-off strategy is activated and the voltage recovery target value based on the simulation results of the three simulation verification scenarios. h(s, v, r) is the strategy adaptability index under the condition of simulation scenario s, voltage stability v, and voltage recovery value r. If the voltage is stable after the low-voltage cut-off strategy is activated, and the voltage is recovered to the target value, it is considered that the low-voltage cut-off strategy is adaptive under this operating mode, at this time h(s, v, r) = 1, otherwise h(s, v, r) = 0.

[0135] Further, combined with the probability calculation of each scenario, the adaptability comprehensive evaluation index of the evaluation system low-voltage cut-off strategy is obtained

[0136]

[0137] Wherein, represents the adaptability comprehensive evaluation index, h(s, v, r) represents the strategy adaptability index under the condition of simulation scenario s i , voltage stability voltage recovery value , and represents the probability of occurrence of simulation scenario s i . represents that the low-voltage cut-off strategy is adaptive; represents that it is not adaptive, and the smaller the value, the worse the adaptability.

[0138] Further, at this time, the adaptability index of the low-voltage cut-off strategy under the three simulation verification scenarios can be obtained, and the simulation verification and adaptability comprehensive evaluation of the system low-voltage cut-off strategy are performed.

[0139] Embodiment 2

[0140] Referring to Figures 1-4As an embodiment of the present invention, a simulation verification system for the low-voltage load shedding adaptability of a local power grid is provided, comprising:

[0141] The data collection module is used to acquire the topology, operating conditions, and configuration information of low-voltage load shedding devices within the control range of the local power grid. Based on the distribution of distributed power sources in the local power grid, it determines three low-voltage load shedding adaptive simulation verification scenarios and their probability of occurrence.

[0142] The model building module is used to construct an electromagnetic transient simulation model of the local power grid based on the topology, operating conditions and configuration information of the low-voltage load shedding device within the control range, using the equivalent modeling method. Based on the electromagnetic transient simulation model of the local power grid and three adaptive simulation verification scenarios for low-voltage load shedding, a simulation verification model of the control strategy of the low-voltage load shedding device is established, and three adaptive electromagnetic transient simulation verification models for low-voltage load shedding of the local power grid are constructed.

[0143] The simulation module is used to simulate and verify the voltage stability of the local power grid under typical severe faults based on three local power grid low-voltage load shedding adaptive electromagnetic transient simulation models.

[0144] The evaluation module is used to comprehensively evaluate the adaptability of the local power grid's low-voltage load shedding strategy based on the voltage stability of the local power grid under typical severe faults and the occurrence probability of three low-voltage load shedding adaptive simulation verification scenarios.

[0145] Specific limitations regarding the simulation verification system for local power grid low-voltage load shedding adaptability can be found in the limitations of the simulation verification method for local power grid low-voltage load shedding adaptability described above, and will not be repeated here. Each module in the aforementioned simulation verification system for local power grid low-voltage load shedding adaptability can be implemented entirely or partially through software, hardware, or a combination thereof. These modules can be embedded in or independent of the processor in a computer device, or stored in the memory of a computer device as software, so that the processor can call and execute the corresponding operations of each module.

[0146] Example 3

[0147] Refer to 1~ Figure 4 This is the third embodiment of the present invention. Building upon the first two embodiments, this embodiment provides a computer device, which may be a server. The computer device includes a processor, memory, and a network interface connected via a system bus. The processor of the computer device provides computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and internal memory. The non-volatile storage medium stores an operating system, computer programs, and a database. The internal memory provides an environment for the operation of the operating system and computer programs stored in the non-volatile storage medium.

[0148] The computer device's database is used to store motion detection data. The computer device's network interface is used to communicate with external terminals via a network connection. When the computer program is executed by the processor, it implements the steps in any of the above embodiments of the sparse tensor computation acceleration method.

[0149] In one embodiment, the present invention provides a computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements the steps in any of the above embodiments of the sparse tensor operation acceleration method.

[0150] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium. When executed, the computer program can include the processes of the embodiments of the above methods. Any references to memory, storage, databases, 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 can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, or optical storage, etc. Volatile memory can include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM), etc.

[0151] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A simulation verification method for the adaptability of local power grid to low-voltage load shedding, characterized in that: include, The topology, operating conditions, and configuration information of low-voltage load shedding devices within the control range of the local power grid are obtained. Based on the distribution of distributed power sources in the local power grid, three low-voltage load shedding adaptive simulation verification scenarios and their probability of occurrence are determined. Based on the topology, operating conditions, and configuration information of low-voltage load shedding devices within the control range of the local power grid, an electromagnetic transient simulation model of the local power grid is constructed using the equivalent modeling method. Based on the electromagnetic transient simulation model of the local power grid and three adaptive simulation verification scenarios for low-voltage load shedding, a simulation verification model of the control strategy of the low-voltage load shedding device is established, and three adaptive electromagnetic transient simulation verification models for low-voltage load shedding of the local power grid 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 obtained through simulation. Based on the voltage stability of the local power grid under typical severe faults, and combined with the occurrence probability of three low-voltage load shedding adaptive simulation verification scenarios, the adaptability of the local power grid low-voltage load shedding strategy is comprehensively evaluated.

2. The simulation verification method for the adaptability of local power grid low-voltage load shedding as described in 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 installation location of the low-voltage load shedding device, the round of low-voltage load shedding control strategy action, the voltage threshold value of each round of action, the delay time of each round of action, 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 cut-off feeder associated with the low-voltage load shedding device, and the name and node voltage level of the starting bus node connected to the cut-off feeder.

3. The simulation verification method for the adaptability of local power grid low-voltage load shedding as described in claim 2, characterized in that: The three low-pressure load shedding adaptability simulation verification scenarios are defined as follows: Based on the local power grid topology and operating conditions, determine the starting bus node N connected to the disconnectable feeder associated with the low-voltage load shedding device. 3i The total number of feeders N 3i-l Name of cut-off feeder, name of non-cut-off feeder, net power of each feeder and the penetration rate of distributed power sources According to the starting bus node N connected to the cut-off feeder 3i Given the distribution of distributed power sources, three simulation verification scenarios were determined: Scenario 1, Scenario 2, and Scenario 3. These scenarios involve the disconnectable feeder connected to the starting bus node N. 3i Scenario 1 describes the scenario where distributed power is 100% evenly distributed across all disconnectable feeders; when the disconnectable feeder is connected to the starting bus node N... 3i Scenario 2 occurs when 50% of the distributed power is evenly distributed across all switchable feeders and 50% is evenly distributed across all non-switched feeders; when the switchable feeder is connected to the starting bus node N... 3i Scenario 3 is defined as 100% of the distributed power is evenly distributed across all non-removable feeders.

4. The simulation verification method for the adaptability of local power grid low-voltage load shedding as described in claim 3, characterized in that: The construction of the local power grid electromagnetic transient simulation model includes, Based on the configuration information of the low-voltage load shedding device, the topology of the power grid, and its operating conditions, the 220kV and below voltage level power grids are equivalently evaluated. When 220kV node N... 1i The downstream power grid is not equipped with low-voltage load shedding devices, and node N is directly connected. 1i All feeders in the downstream power grid are equivalent to a single feeder and are connected to node N. 1i ; When 220kV node N 2i The lower-level power grid is equipped with a low-voltage load shedding device. For the next lower-level power grid equipped with the low-voltage load shedding device, each feeder in the next lower-level power grid is connected to the starting bus node N of the disconnectable feeder. 3i For downstream power grids that are not equipped with low-voltage load shedding devices, the downstream power grid is directly equivalent to the bus node N where the 220kV node is located. 2i .

5. The simulation verification method for the adaptability of local power grid low-voltage load shedding as described in claim 4, characterized in that: The construction of the local power grid electromagnetic transient simulation model also includes Equivalent node N i The distributed generation and load of each feeder are equal in value. The distributed generation and load of each feeder are regarded as injected power nodes. The injected power of the distributed generation is positive, and the injected power of the load is negative. They are collectively injected into the equal value node N. i ; Based on the equivalent node N i Distributed power penetration and net power Compute node N i Active power of the equivalent load Reactive power of equivalent load and the active power of equivalent distributed power sources Based on the equivalent node N i The apparent net power and equivalent node voltage Calculate the equivalent node N i Total impedance below When constructing the electromagnetic transient simulation model of the local power grid, the equivalent node N i The distributed power supply is simulated using the single-machine equivalent method, and the rated capacity of a single distributed power supply unit is... Power generation is P pv-1 According to a typical new energy single unit with a power generation capacity of P pv-1 impedance Z at time pv-1 Calculate the impedance of the equivalent distributed power source. Combined with equivalent nodes N i Total impedance and the impedance of the equivalent distributed source Calculate the impedance of the equivalent load The equivalent load simulation model uses power as impedance is The equivalent load is used to simulate it.

6. The simulation verification method for the adaptability of local power grid low-voltage load shedding as described in claim 5, characterized in that: The simulation verification model for the control strategy of the low-voltage load shedding device, based on the local power grid electromagnetic transient simulation model, includes: Based on the local power grid electromagnetic transient simulation model, a switch simulator Break is installed on the disconnectable feeder associated with the k-th round action of the low-voltage load shedding control strategy. k The switch is initially closed. Let L be the feeder that is cut off in the k-th round. k The initial value of k is 1; The low-voltage load shedding device monitors the effective voltage U of its configured node i. i The load shedding strategy is simulated in the simulation software. If the effective voltage value U is detected... i The load shedding voltage threshold U is less than that of the k-th round. thk Delay t k s, disconnect switch Break k Cut off feeder L k Otherwise, switch Break k Remains closed and does not move; If the effective value U of the voltage at node i is monitored i Less than the voltage recovery target value U ig If k = k + 1, then k ≤ N k And the effective voltage value U was detected. i The load shedding voltage threshold U is less than that of the k-th round. thk Delay t k s, disconnect switch Break k Cut off feeder L k Otherwise, switch Break k Keep the device closed and do not move; if k > N k The low-voltage load shearing device stops disconnecting the feeder; If the effective value U of the voltage at node i is monitored i Greater than or equal to the voltage recovery target value U ig , that is U i ≥U ig， Then the low-voltage load shearing device will stop disconnecting the feeder.

7. The simulation verification method for the adaptability of local power grid low-voltage load shedding as described in claim 6, characterized in that: The comprehensive assessment of the adaptability of the local power grid low-voltage load shedding strategy includes, Simulations were performed for three different simulation verification scenarios to obtain time-domain simulation results under typical severe faults. Based on existing relevant standards, the power grid stability under each verification scenario and its faults was judged and recorded. The adaptability of the low-voltage load shedding strategy is evaluated from two perspectives: voltage stability and voltage recovery target value after the low-voltage load shedding strategy is implemented. 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 shedding strategy is implemented and the voltage recovers to the target value, then the low-voltage load shedding strategy is considered to be adaptable under this operating mode, and h(s,v,r) = 1 is recorded. Otherwise, h(s,v,r) = 0 is recorded. Based on the probability of each scenario occurring, calculate the comprehensive evaluation index of the adaptability of the low-pressure load shedding strategy of the evaluation system. The adaptive comprehensive evaluation index The calculation formula is as follows: in, Indicates the comprehensive assessment index of adaptability. Represents simulation scenario s i Voltage stability Voltage recovery value Indicators of strategy adaptability under different circumstances Represents simulation scenario s i The probability of occurrence; when When, it represents the adaptation of low-pressure load reduction strategy, when This indicates that the low-pressure load reduction strategy is not suitable.

8. A simulation verification system for the adaptability of local power grid to low-voltage load shedding, based on the simulation verification method for the adaptability of local power grid to low-voltage load shedding as described in any one of claims 1 to 7, characterized in that: It also includes, The data collection module is used to acquire the topology, operating conditions, and configuration information of low-voltage load shedding devices within the control range of the local power grid. Based on the distribution of distributed power sources in the local power grid, it determines three low-voltage load shedding adaptive simulation verification scenarios and their probability of occurrence. The model building module is used to construct an electromagnetic transient simulation model of the local power grid based on the topology, operating conditions and configuration information of the low-voltage load shedding device within the control range, using the equivalent modeling method. Based on the electromagnetic transient simulation model of the local power grid and three adaptive simulation verification scenarios for low-voltage load shedding, a simulation verification model of the control strategy of the low-voltage load shedding device is established, and three adaptive electromagnetic transient simulation verification models for low-voltage load shedding of the local power grid are constructed. The simulation module is used to simulate and verify the voltage stability of the local power grid under typical severe faults based on three local power grid low-voltage load shedding adaptive electromagnetic transient simulation models. The evaluation module is used to comprehensively evaluate the adaptability of the local power grid's low-voltage load shedding strategy based on the voltage stability of the local power grid under typical severe faults and the occurrence probability of three low-voltage load shedding adaptive simulation verification scenarios.

9. A computer device comprising a memory and a processor, wherein the memory stores a computer program, characterized in that: When the processor executes the computer program, it implements the steps of the simulation verification method for local power grid low-voltage load shedding adaptability as described in any one of claims 1 to 7.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by the processor, it implements the steps of the simulation verification method for the adaptability of local power grid low-voltage load shedding as described in any one of claims 1 to 7.

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