System stabilization system and system stabilization method

Abstract

This helps to suppress excessive or insufficient control after an accident occurs. [Solution] A power grid stabilization system 1 for stabilizing a power grid 4 after an accident, comprising: a pre-stabilization calculation unit 22 that performs stabilization calculations for a hypothetical accident before the accident and creates a control table summarizing power grid stabilization measures; a control change information generation unit 23 that generates control change information for changing the stabilization measures in the control table according to the estimated value of the post-accident heat capacity of the power transmission and distribution equipment of the power grid after the accident; a post-accident heat capacity calculation unit 24 that calculates the post-accident heat capacity of the power transmission and distribution equipment after the accident based on post-accident system measurement information and weather information; a control determination unit 25 that determines whether to change the stabilization measures in the control table based on control change support information and post-accident heat capacity, and changes the stabilization measures based on the control change information if the stabilization measures are to be changed; and a stabilization control unit 26 that outputs a control command based on the determination result of the control determination unit.

Description

Technical Field

[0001] The present invention relates to a power system stability system and a power system stability method.

Background Art

[0002] In a power system, when an accident occurs, there is a possibility that a power flow exceeding the heat capacity of a transmission line or a transformer may occur. Such a phenomenon is called an overload phenomenon.

[0003] As a countermeasure for eliminating this overload, a power system stability system is used. The power system stability system executes control such as immediately limiting the power output or interrupting the load when an accident occurs, so that the power flow does not exceed the heat capacity.

[0004] The heat capacity is determined by the upper limit temperature when a power flow flows through a transmission line or a transformer. The upper limit temperature is determined by the characteristics of the equipment such as the type and size (length) of the power transmission and distribution facilities, and the ambient environment that changes moment by moment such as the temperature and wind conditions. Conventional power system stability systems have determined the heat capacity by using these temperature and wind conditions as fixed values.

[0005] However, when the heat quantity is a fixed value, the power source and the load may be excessively controlled, which may increase the control cost or the control amount may be insufficient and the overload may not be eliminated.

[0006] Therefore, as a method of dynamically changing the heat capacity, a dynamic rating (hereinafter referred to as DLR, including transformers) that changes the heat capacity using the ambient temperature and wind conditions has been proposed.

[0007] Patent Document 1 describes an operating capacity calculation device that calculates the heat capacity in advance using the DLR method and further calculates the operating capacity or control content based on it in advance.

Prior Art Documents

Non-Patent Documents

[0008] [Patent Document 1] Japanese Patent Publication No. 2023-163309 [Overview of the project] [Problems that the invention aims to solve]

[0009] The operational capacity calculation device described in Patent Document 1 executes pre-determined control of the power generation equipment in the event of an accident. This operational capacity calculation device makes it possible to determine an operational capacity that ensures grid stability while also setting a high upper limit on the thermal capacity. However, if there is a difference between the pre-calculated thermal capacity and the thermal capacity determined from the surrounding environment after the accident, an over- or under-control amount may occur, potentially leading to increased control costs and overload.

[0010] Therefore, the present invention has been made in view of the above problems, and its purpose is to provide a technology that suppresses excess or deficiency of control values ​​after an accident occurs. [Means for solving the problem]

[0011] Therefore, the present invention has been made in view of the above problems, and is a power system stabilization system for stabilizing a power system after an accident, comprising: a pre-stabilization calculation unit that performs stabilization calculations for a hypothetical accident before the accident and generates a control table including stabilization measures for the power system; a control change information generation unit that generates control change information for changing the stabilization measures in the control table according to an estimated value of the post-accident heat capacity of the power transmission and distribution equipment of the power system after the accident; a post-accident heat capacity calculation unit that calculates the post-accident heat capacity of the power transmission and distribution equipment after the accident based on post-accident system measurement information and weather information; a determination unit that determines whether to change the stabilization measures in the control table based on the control change information and the post-accident heat capacity, and if the stabilization measures are to be changed, changes the stabilization measures based on the control change information; and a control unit that outputs a control command based on the determination result of the determination unit. [Effects of the Invention]

[0012] According to the present invention, it is possible to suppress excesses or deficiencies in the control amount when an accident occurs. [Brief explanation of the drawing]

[0013] [Figure 1] A block diagram showing an example of the hardware configuration of the system stabilization system according to Example 1. [Figure 2] A block diagram showing an example of the functional configuration of the system stabilization system according to Example 1. [Figure 3] A flowchart showing an example of the system stabilization process according to Example 1. [Figure 4] A diagram showing an example of a control table according to Example 1. [Figure 5] A flowchart showing an example of the control change information creation process according to Example 1. [Figure 6] A diagram showing an example of control change information related to Example 1. [Figure 7] A diagram showing an example of the functional configuration of the system stabilization system according to Example 2. [Figure 8] A flowchart showing an example of the system stabilization process according to Example 2. [Modes for carrying out the invention]

[0014] The embodiments of the present invention will be described in detail below with reference to the drawings. However, the invention is not limited to these embodiments. [Examples]

[0015] Figure 1 is a block diagram showing an example of the hardware configuration of the system stabilization system according to Example 1.

[0016] The system stabilization system 1 is configured using a computer. The system stabilization system 1 includes a communication unit 11, an input device 12, an output device (display device) 13, a CPU (Central Processing Unit) 14, a memory 15, and a database DB. These communication unit 11, input device 12, output device 13, CPU 14, memory 15, and database DB are communicably connected to each other via a bus 17.

[0017] The communication unit 11 includes a circuit and a communication protocol for connecting to a communication network. The communication network acquires weather information from a weather information providing system, acquires information such as system configuration and power flow status from measurement sensors installed in the power system, and transmits control information to a control terminal.

[0018] The input device 12 includes a device for a user to input information, such as a keyboard, a mouse, or a touch panel.

[0019] The output device 13 includes a device for outputting information, such as a display device or a printer device.

[0020] The CPU 14 performs processing related to system stabilization, such as searching for data stored in the database DB or the memory 15, executing a computer program, and storing the calculation result in the memory 15.

[0021] The memory 15 is, for example, a RAM (Random Access Memory), and includes information storage means for storing a computer program, calculation results, image data, and the like.

[0022] The database DB stores various data related to system stabilization. The database DB includes databases DB1 to DB4 (see FIG. 2) described later.

[0023] FIG. 2 is a block diagram showing an example of the functional configuration of the system stabilization system according to the first embodiment.

[0024] The grid stabilization system 1 is connected to the power grid 4 via communication. The power grid 4 has a generator 4a that generates electricity. The grid stabilization system 1 stabilizes the power grid 4 after an accident, and eliminates the overload of the power grid 4 while suppressing control costs.

[0025] The power grid stabilization system 1 includes a database (hereinafter sometimes abbreviated as DB) consisting of a weather information DB1, a hypothetical accident DB2, a power grid configuration DB3, and a power grid measurement DB4. The weather information DB1 stores weather information such as past, present, and future temperature and wind conditions. The hypothetical accident DB2 stores hypothetical accidents for the power grid 4. An accident is, for example, a state in which the voltage or frequency becomes unstable due to a lightning strike on the power grid 4. The power grid configuration DB3 stores power grid information such as the power grid configuration of the power grid 4, the type and size of power grid equipment, and various thresholds based on them. The power grid measurement DB4 stores various measurement data of the power grid 4 as power grid measurement information.

[0026] Furthermore, the system stabilization system 1 includes a pre-heat capacity calculation unit 21, a pre-stabilization calculation unit 22, a control change information generation unit 23, a post-heat capacity calculation unit 24, a control determination unit 25 as an example of a "determination unit", and a stabilization control unit 26 as an example of a "control unit".

[0027] The pre-heat capacity calculation unit 21 obtains pre-fault system measurement information for power system 4 from system measurement DB4 and weather information from weather information DB1. Based on this system measurement information and weather information, the pre-heat capacity calculation unit 21 calculates the pre-heat capacity of the power transmission and distribution equipment.

[0028] The pre-stabilization calculation unit 22 performs stabilization calculations for a hypothetical fault in power system 4 before the fault occurs and generates a control table (described later in Figure 4) that includes stabilization measures for power system 4. The control table includes the control targets and control details for stabilization measures.

[0029] The control change information generation unit 23 generates control change information to modify the stabilization measures in the control table according to the estimated post-accident heat capacity of the power transmission and distribution equipment of the power system 4 after the accident.

[0030] The post-accident heat capacity calculation unit 24 calculates the post-accident heat capacity of the power transmission and distribution equipment based on post-accident system measurement information and weather information. The post-accident heat capacity calculation unit 24 may also calculate the post-accident heat capacity of the power transmission and distribution equipment based on post-accident system measurement information, weather information, or the latest system measurement information and weather information acquired in a short period.

[0031] The control determination unit 25 determines whether to change the stabilization measures in the control table based on the control change information and the subsequent heat capacity. If the control determination unit 25 changes the stabilization measures, it changes the stabilization measures based on the control change information. The control determination unit 25 may change at least one of the controlled object and the control content.

[0032] The stabilization control unit 26 outputs a control command to the controlled object, such as the generator 4a of the power system 4, based on the determination result of the control determination unit 25.

[0033] The CPU 14 implements these functions by executing computer programs called from memory 15.

[0034] Figure 3 is a flowchart showing an example of the system stabilization process according to Example 1.

[0035] Processing steps S11-S13 are the steps to be performed before an accident occurs, and processing steps S15-S18 are the steps to be performed after an accident occurs. The processing details for each step will be explained below, following the flow shown in Figure 3.

[0036] First, in processing step S11 of Figure 3, the pre-heat capacity calculation unit 21 calculates the pre-heat capacity. For example, the pre-heat capacity calculation unit 21 may calculate the heat capacity using dynamic rating (DLR) with ambient environmental information such as current or future temperature and wind conditions stored in the weather information DB1 and equipment information such as the type and length of the power transmission line stored in the system information DB.

[0037] Next, in processing step S12, the pre-stabilization calculation unit 12 calculates the control target and control content for each assumed accident using the heat capacity calculated in processing step S11 or a pre-registered heat capacity, and generates a control table. For example, the control table may be created using the method described in Japanese Patent Application Publication No. 2018-57117, with the overload threshold set to the pre-calculated heat capacity calculated in processing step S11. As shown in Figure 4, the control table stores information including the control target and control content for each assumed accident.

[0038] Figure 4 shows an example of a control table according to Example 1.

[0039] The control table stores the assumed accident, the controlled object, and the control content as item values ​​(column values). The control table stores accidents A, B, and C, etc.

[0040] As an example, let's explain accident A. Accident A means that the controlled object is generator A, and the controlled content is power supply control.

[0041] Next, in processing step S13, the control change information creation unit 13 creates control change information that includes formulas and conditions for correcting the control table.

[0042] Now, let's briefly explain the specific processing of the control change information generation unit 13.

[0043] Figure 5 is a flowchart showing an example of the control change information creation process according to Example 1.

[0044] As shown in Figure 5, in processing step S131, the control change information generation unit 13 acquires various calculation results, including the control table created by the pre-stabilization calculation unit 12.

[0045] Next, in processing step S132, the control change information generation unit 13 selects one assumed fault. In processing step S133, the control change information generation unit 13 selects one power transmission and distribution facility.

[0046] Next, the control change information generation unit 13 repeats the processing steps S134 to S137 for each assumed fault and each power transmission and distribution facility that has been specified in advance. The calculation time can be shortened by pre-selecting only the assumed faults and power transmission and distribution facilities where overload is a problem.

[0047] Next, in processing step S134, the control change information generation unit 13 extracts the constraint that results in the lowest upper limit of the power flow passing through the target power transmission and distribution equipment, excluding the thermal capacity constraint, from among the constraints that determine the operational capacity, excluding the thermal capacity constraint. Here, constraints that determine the operational capacity other than the thermal capacity constraint include constraints such as frequency constraints, voltage constraints, and synchronous stability constraints. The upper limits of the power flow due to each of these constraints are calculated, for example, by the pre-stabilization calculation unit 12.

[0048] Next, in processing step S135, the control change information generation unit 13 determines whether the upper limit of the tidal flow due to the heat capacity constraint may become lower than the upper limit of the tidal flow due to the constraint extracted in processing step S134 due to changes in temperature and wind conditions. For example, if the estimated upper limit of the tidal flow due to the heat capacity constraint calculated by the control change information generation unit 13 based on the maximum temperature and windless conditions stored in the weather information DB is lower than the upper limit of the tidal flow due to the constraint extracted in S134, the process proceeds to processing step S136.

[0049] Next, in processing step S136, the control change information generation unit 13 uses the upper limit of the tidal flow due to constraints extracted in processing step S134 as the maximum value and the upper limit of the tidal flow due to heat capacity constraints estimated based on the maximum temperature and no wind as the minimum value, and performs stabilization calculations while changing the upper limit of the tidal flow due to heat capacity constraints as a variable, thereby determining a new control target and control content for each upper limit of the tidal flow due to heat capacity constraints.

[0050] Next, in processing step S137, the control change information generation unit 13 generates a formula to correct the power flow upper limit value due to the heat capacity constraint, which was determined in advance, from the post-heat capacity calculation unit 24 calculated. For example, consider the case where the pre-heat capacity calculation unit 21 predicts the temperature and wind conditions one hour ahead, and uses DLR to determine and output the heat capacity of the most severe cross-section (maximum temperature, no wind) for the next hour. If this heat capacity is lower than the heat capacity determined by DLR in the post-heat capacity calculation unit 24 by a certain amount, the average of the pre-heat capacity calculated by the pre-heat capacity calculation unit 21 and the post-heat capacity calculated by the post-heat capacity calculation unit 24 becomes the power flow upper limit value due to the heat capacity constraint. On the other hand, if the pre-heat capacity determined in advance is higher than the post-heat capacity determined later, the post-heat capacity determined later is used as the power flow upper limit value due to the heat capacity constraint.

[0051] Next, in processing step S138, the control change information generation unit 13 determines whether it has selected all specified power transmission and distribution equipment. If the result of the determination in step S138 is false (S138: NO), the control change information generation unit 13 returns to step S133. If the result of the determination in step S138 is true (S138: YES), the control change information generation unit 13 determines whether it has selected all specified assumed faults (S139). If the result of the determination in step S139 is false (S139: NO), the control change information generation unit 13 returns to step S132. If the result of the determination in step S139 is true (S139: YES), the control change information generation unit 13 terminates the control change information creation process.

[0052] Figure 6 shows an example of control change information related to Example 1.

[0053] The control change information includes the assumed fault, the power transmission and distribution equipment, the control change conditions including the power flow upper limit due to the heat capacity constraint calculated in processing step S136, the controlled object, the control content, and the conditions and formulas related to the correction of the heat capacity calculated before the fault, calculated in processing step S137.

[0054] As described above, the control change information generation unit 13 creates control change information.

[0055] Let's return to Figure 3 and continue the explanation. In processing step S14 of Figure 3, the post-incident heat capacity calculation unit 24 determines whether an accident has occurred. If the determination result of step S14 is true (S14:YES), the post-incident heat capacity calculation unit 24 proceeds to processing step S15; if the determination result of step S14 is false (S14:NO), it repeats processing steps S11 to S13.

[0056] Next, in processing step S15, the post-accident heat capacity calculation unit 24 acquires information including system measurement information, system configuration information, and weather information after the accident and calculates the post-accident heat capacity. For example, this post-accident heat capacity may be the heat capacity calculated by DLR using the current cross-section after the accident, or it may be the latest value of the heat capacity calculated by DLR at regular intervals.

[0057] Next, in processing step S16, the control determination unit 25 determines whether it is necessary to change the control described in the control table based on the heat capacity obtained in processing step S15 and the control change information. For example, if an accident A occurs, the power flow of transmission line A obtained from system measurement information is 90 MW, the post-accident heat capacity obtained in S15 after the accident is 95 MW, and the pre-accident heat capacity obtained in S11 before the accident is 89 MW, then whether it is necessary to change the control table, and the changed control target and control content, are determined by the following calculation.

[0058] First, the control and determination unit 25 changes the upper limit of the power flow due to the heat capacity constraint. Since the post-accident heat capacity of 95 MW is greater than the pre-accident heat capacity of 89 MW, as shown in Figure 6, the upper limit of the power flow due to the heat capacity constraint is the average of these heat capacities, (89 MW + 95 MW) / 2 = 92 MW.

[0059] Here, the power flow of 90 MW passing through transmission line A is smaller than the power flow upper limit of 92 MW and the threshold of 100 MW due to the heat capacity constraint, and the power flow upper limit of 92 MW due to the heat capacity constraint is greater than the threshold of 80 MW. In order to satisfy the control change conditions described in the control change information in Figure 6, the control is changed to one that corresponds to these conditions. In this example, the power limit for generator A, as described in the control table in Figure 4, was originally in effect. However, it is determined that this control is unnecessary.

[0060] In this way, by creating control change information in advance before an accident occurs, the control determination unit 25 can immediately determine whether or not to change the control table and what the changes should be after the accident.

[0061] Next, in processing step S17, the control determination unit 25 determines whether control is necessary based on the result of processing step S16. If the determination result of step S16 is false (S16: NO), the post-heat capacity calculation unit 24 terminates the system stabilization process. If the determination result of step S16 is true (S16: YES), the post-heat capacity calculation unit 24 proceeds to processing step S18, and the stabilization control unit 26 issues a control command to the controlled object, such as a generator.

[0062] As described above, in Example 1, by changing the control table based on the post-accident heat capacity obtained after the accident, it is possible to reduce the amount of control required for the generator and thus reduce control costs, or conversely, to immediately compensate for any shortage of control and suppress overload phenomena. As a result, it is possible to suppress any excess or deficiency of control after an accident occurs. [Examples]

[0063] Figure 7 shows an example of the functional configuration of the system stabilization system according to Example 2.

[0064] In Figure 7, the system stabilization system 10 includes databases DB1 to DB4 similar to those in Example 1.

[0065] Furthermore, the grid stabilization system 10 includes a post-calculation information generation unit 31, a post-heat capacity calculation unit 24, a pre-stabilization calculation unit 32, and a stabilization control unit 26.

[0066] The post-accident calculation information generation unit 31 generates post-accident calculation information to support stabilization calculations after an accident.

[0067] The pre-stabilization calculation unit 32 performs stabilization calculations for the accident that occurred based on the post-accident heat capacity, system measurement information, and weather information.

[0068] The CPU 14 implements these functions by executing computer programs called from memory 15.

[0069] The system stabilization system 10 of Example 2 differs from Example 1 in that it does not perform heat capacity calculations and stabilization calculations before an accident, but performs them after an accident. For example, if stabilization cannot be achieved even after implementing the control of Example 1, the system may be configured to additionally implement the control of Example 2.

[0070] Figure 8 is a flowchart showing an example of the system stabilization process according to Example 2.

[0071] Processing step S21 is a flow performed before an accident occurs, and processing steps S23 to S25 are flows performed after an accident occurs. Hereafter, the processing content at each processing step will be explained according to the flow in Figure 8.

[0072] First, in processing step S21 of Figure 8, the post-calculation information generation unit 31 generates post-calculation support information to assist in calculations after an accident. For example, the post-calculation support information includes location information of transmission and distribution equipment where overload may occur, estimated from assumed accident information, pre-accident system measurement information, system configuration information, and weather information. This information allows for calculation of the post-accident heat capacity only for transmission and distribution equipment where overload is a problem, thereby reducing calculation time.

[0073] Next, in processing step S22, the post-incident heat capacity calculation unit 24 determines whether an accident has occurred. If the determination result of step S22 is true (S22:YES), the post-incident heat capacity calculation unit 24 proceeds to processing step S23; if the determination result of step S22 is false (S22:NO), it repeats processing step S21.

[0074] Next, in processing step S23, the post-accident heat capacity calculation unit 24 acquires information including system measurement information, system configuration information, and weather information after the accident and calculates the post-accident heat capacity. For example, this post-accident heat capacity may be the heat capacity calculated by DLR using the current cross-section after the accident, or it may be the latest value of the heat capacity calculated by DLR at regular intervals.

[0075] Next, in processing step S24, the post-stabilization calculation unit 32 uses the post-heat capacity calculated in S23 as the overload threshold, and determines the control target and control content by performing a stabilization calculation using post-fault system measurement information, system configuration information, and weather information. Any known method can be used for the stabilization calculation.

[0076] Next, in processing step S25, the stabilization control unit 26 issues a control command according to the control target, such as the generator, and the control content determined in processing step S24.

[0077] As described above, in Example 2, by performing stabilization calculations after the accident using the post-accident heat capacity obtained after the accident, it is possible to reduce control costs and suppress overload. As a result, it is possible to suppress excesses or deficiencies in the control amount after an accident occurs. [Explanation of Symbols]

[0078] 1.10: System stabilization system, 21: Pre-heat capacity calculation unit, 22: Pre-stabilization calculation unit, 23: Control change information generation unit, 24: Post-heat capacity calculation unit, 25: Control determination unit, 26: Stabilization control unit, 31: Post-calculation information generation unit, 32: Post-stabilization calculation unit, 4: Power system

Claims

1. A grid stabilization system for stabilizing the power grid after an accident, A pre-stabilization calculation unit performs stabilization calculations for a hypothetical accident before the accident and generates a control table that includes stabilization measures for the power system, A control change information generation unit generates control change information for changing the stabilization measures in the control table according to the estimated value of the post-accident heat capacity of the power transmission and distribution equipment of the power system after the accident, A post-accident heat capacity calculation unit calculates the post-accident heat capacity of the power transmission and distribution equipment after the accident based on the system measurement information and weather information after the accident, Based on the control change information and the subsequent heat capacity, a determination unit determines whether to change the stabilization measures in the control table, and if the stabilization measures are to be changed, a determination unit determines whether to change the stabilization measures based on the control change information. A system stabilization system comprising: a control unit that outputs a control command based on the determination result of the determination unit;

2. A grid stabilization system for stabilizing the power grid after an accident, A post-accident calculation information generation unit generates post-accident calculation information to support the stabilization calculation after the accident, A post-accident heat capacity calculation unit calculates the post-accident heat capacity of the power transmission and distribution equipment of the power system after the accident, based on the system measurement information and weather information after the accident. A post-stabilization calculation unit performs stabilization calculations for the accident that occurred based on the aforementioned post-heat capacity, the aforementioned system measurement information, and the aforementioned weather information. A system stabilization system comprising: a control unit that outputs a control command based on the calculation results of the post-stabilization calculation unit;

3. The control table includes the control target and control content of the stabilization measures, The determination unit changes at least one of the controlled object and the controlled content. The system stabilization system according to claim 1.

4. The system further includes a pre-heat capacity calculation unit that calculates the pre-heat capacity of the power transmission and distribution equipment before the accident, based on the system measurement information and weather information before the accident. The system stabilization system according to claim 3.

5. The aforementioned after-heat capacity is calculated by dynamic rating. The system stabilization system according to claim 2 or 4.

6. The control change information generation unit, The transmission and distribution equipment is classified into two types: thermal capacity-constrained transmission and distribution equipment, in which the upper limit of power flow may be determined by thermal capacity constraints, and non-thermal capacity-constrained transmission and distribution equipment, in which the upper limit of power flow may not be determined by thermal capacity constraints. For the aforementioned heat capacity-constrained power transmission and distribution equipment, stabilization calculations are performed while varying the heat capacity as a parameter to determine a stabilization measure different from the stabilization measure in the control table, and the conditions for the heat capacity of the power transmission and distribution equipment resulting from this stabilization measure. The power grid stabilization system according to claim 4.

7. The control change information generation unit determines that if the estimated value of the heat capacity calculated using past or present weather information is lower than the operational capacity determined by constraints other than the heat capacity constraint, there is a possibility that the power flow limit of the power transmission and distribution equipment is determined by the heat capacity constraint. The power grid stabilization system according to claim 6.

8. The control change information generation unit, The operational capacity determined by constraints other than the aforementioned heat capacity constraint, or the heat capacity calculated using past or present weather information, shall be set as the upper and lower limits of the heat capacity. The heat capacity is varied as a parameter within the upper and lower limits of the aforementioned heat capacity. The system stabilization system according to claim 7.

9. The control change information generation unit generates conditions for changing the pre-heat capacity or pre-registered operating capacity according to the post-heat capacity. The system stabilization system according to claim 4.

10. A grid stabilization method in which a grid stabilization system stabilizes the power grid after an accident, The steps include: performing stabilization calculations for a hypothetical accident before the accident and generating a control table that includes stabilization measures for the power system; The steps include generating control change information for modifying the stabilization measures in the control table according to the estimated value of the post-accident heat capacity of the power transmission and distribution equipment in the power system, The steps include: calculating the post-accident heat capacity of the power transmission and distribution equipment based on the system measurement information and weather information after the accident; Based on the control change information and the subsequent heat capacity, a step is made to determine whether to change the stabilization measures in the control table, and if the stabilization measures are to be changed, the stabilization measures are changed based on the control change information. A system stabilization method comprising: a step of outputting a control command based on the determination result of the step of changing the stabilization measures.

11. A grid stabilization method in which a grid stabilization system stabilizes the power grid after an accident, The steps include generating post-accident calculation information to support stabilization calculations after the accident, A step of calculating the post-accident heat capacity of the power transmission and distribution equipment of the power system after the accident, based on the system measurement information and weather information after the accident, The steps include: performing stabilization calculations for the accident that occurred based on the aforementioned post-accident heat capacity, the aforementioned system measurement information, and the aforementioned meteorological information; A system stabilization method comprising: a step of outputting a control command based on the calculation result of the stabilization calculation step.

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