Inertia estimation system, inertia estimation device, simulated inertia inverter, and program

Abstract

This invention provides an inertia estimation system, an inertia estimation device, a simulated inertia inverter, and a program that can calculate inertia in a power grid and control a simulated inertia inverter. [Solution] The inertia estimation system of the embodiment comprises an inertia estimation device and a simulated inertia inverter. The inertia estimation device comprises a measuring instrument database which includes at least the locations in the power system of measuring instruments that acquire measurement information used for inertia estimation, an inertia estimation unit which estimates the inertia in the power system, a setting calculation unit which calculates an inertia setting value to be set in the simulated inertia inverter, a communication unit which communicates the calculated inertia setting value, and an inertia calculation unit which calculates the inertia in the power system based on the inertia estimated by the inertia estimation unit and the inertia setting value. The simulated inertia inverter comprises a simulated inertia control unit which simulates the inertial operation of a generator, an inverter communication unit which receives the inertia setting value, and a constant setting unit which sets the inertia setting value in the simulated inertia control unit.

Description

Technical Field

[0001] Embodiments of the present invention relate to an inertia estimation system, an inertia estimation device, a simulated inertia inverter, and a program.

Background Art

[0002] In recent years, in the power system, the introduction of renewable energy such as solar power generation and wind power generation and inverter power sources connected to the power system via inverters such as storage batteries has been progressing. It is necessary to match the demand and supply in the power system. Therefore, in order to introduce an inverter power source, for example, it is necessary to stop an existing generator to match the demand and supply.

[0003] Here, when the demand-supply balance changes, the generator has an inertial force that operates to change the frequency and suppress the change in the demand-supply balance. On the other hand, since the inverter power source does not have an inertial force, in a power system where the inverter power source has become widespread, there is a high possibility that the inertia in the power system will decrease. As a result, there is a concern that the rate of change of frequency (RoCoF: Rate of Change of Frequency) and the change in frequency when an accident occurs in the power system will increase, making it difficult to maintain the frequency in the power system.

[0004] Therefore, the development of a technology for estimating the inertia in the power system and the development of a simulated inertia inverter that gives simulated inertia by simulating the inertial operation of a generator in an inverter power source are underway.

[0005] Conventionally, a method for estimating the inertia of a power system has been shown by considering the power system as a two-generator model and using the Inter-Area oscillation, which is an electromechanical oscillation mode that occurs between generators.

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

[0007] [Non-Patent Document 1] Thongchart kerdphol et al.,”Inertia Estimation of the 60 Hz Japanese Power System From Synchrophasor Measurements”, IEEE.Transactions On Power Systems,Vol.38,pp.753-766,Jan 2023. [Overview of the Initiative] [Problems that the invention aims to solve]

[0008] Here, as a measuring instrument for estimating inertia, for example, a synchronous phasor measurement unit (PMU) is used, which is time-synchronized by a satellite positioning system such as GPS and can measure voltage, current, active power, reactive power, and phase.

[0009] PMUs are expensive due to the equipment costs required for communication. When deploying many PMUs throughout the entire power grid, one way to reduce equipment costs is to limit the locations where PMUs are placed.

[0010] In estimating inertia in power systems, the conventional method of estimating inertia using inter-area oscillations is best performed by considering the actual power system as a two-generator model and using the center of inertia (COI) corresponding to the phase of the reduced generator.

[0011] However, the center of inertia changes depending on factors such as the disconnection state of the generators. Therefore, it is difficult to pinpoint the location corresponding to the center of inertia in a power system. Furthermore, the location where the active power flowing between two generators is measured should be a point where the temporal variation of the phase is close to zero. However, since the location corresponding to the center of inertia in a power system changes, it is difficult to pinpoint.

[0012] The problem that this invention aims to solve is to provide an inertia estimation system, an inertia estimation device, a simulated inertia inverter, and a program that can calculate inertia in a power grid and control a simulated inertia inverter. [Means for solving the problem]

[0013] The inertia estimation system of this embodiment comprises an inertia estimation device for estimating inertia in a power system and a simulated inertia inverter. The inertia estimation device comprises a measuring instrument database which includes at least the locations in the power system of measuring instruments that acquire measurement information used for inertia estimation, an inertia estimation unit for estimating inertia in the power system, a setting calculation unit for calculating an inertia setting value to be set in the simulated inertia inverter, a communication unit for communicating the calculated inertia setting value, and an inertia calculation unit which calculates the inertia in the power system based on the inertia estimated by the inertia estimation unit and the calculated inertia setting value. The simulated inertia inverter comprises a simulated inertia control unit which simulates the inertial operation of a generator, an inverter communication unit which receives the inertia setting value, and a constant setting unit which sets the inertia setting value in the simulated inertia control unit. [Brief explanation of the drawing]

[0014] [Figure 1] This figure shows an example configuration of the inertia estimation device according to the embodiment. [Figure 2] This figure shows an example configuration of a simulated inertial inverter according to the embodiment. [Figure 3] This figure shows an example configuration 1 of the simulated inertia control unit of the embodiment. [Figure 4] This figure shows an example configuration 2 of the simulated inertia control unit of the embodiment. [Figure 5]It is a diagram showing an example of the characteristics of the transfer characteristic elements during inertia estimation in Configuration Example 2 of the simulated inertia control unit. [Figure 6] It is a diagram showing an example of the characteristics of the transfer characteristic elements when inertia estimation is not performed in Configuration Example 2 of the simulated inertia control unit. [Figure 7] It is a flowchart showing an example of inertia estimation of the inertia estimation device according to the embodiment.

Mode for Carrying Out the Invention

[0015] Hereinafter, the inertia estimation system, inertia estimation device, simulated inertia inverter, and program according to the embodiment will be described with reference to the drawings.

[0016] FIG. 1 is a diagram showing a configuration example of the inertia estimation device 10 according to the embodiment. Here, the inertia estimation system includes the inertia estimation device 10 and the simulated inertia inverter 20. As shown in FIG. 1, the inertia estimation device 10 includes a CPU (Central Processing Unit) 100, a storage unit 101, a setting calculation unit 102, a communication unit 103, an inertia estimation unit 104, an inertia calculation unit 105, a dynamic characteristic calculation unit 106, a simulated inertia inverter database 107, a power system database 108, a measuring instrument database 109, and an inertia center location database 110.

[0017] The CPU 100 is a part that performs operations and controls necessary for the inertia estimation operation in the inertia estimation device 10.

[0018] The storage unit 101 includes a random access memory (RAM) that temporarily holds data necessary for performing the inertia estimation operation, a read only memory (ROM) that stores programs for realizing various processes by the CPU 100, a hard disk drive (HDD) that permanently holds software and data, a solid state drive (SSD), and the like.

[0019] Next, the setting calculation unit 102 calculates the inertia setting values to be set in the simulated inertia inverter 20. The inertia setting values to be set in the simulated inertia inverter 20 are, for example, two types of settings: the unit inertia constant M and the braking constant D.

[0020] Also, in order to calculate the inertia setting values, the setting calculation unit 102 selects, for example, the constants of the unit inertia constant M and the braking constant D so that the location of the center of inertia of the power system approaches the location of the measuring instrument included in the measuring instrument database 109.

[0021] Therefore, for example, the dynamic characteristic calculation unit 106 changes the values of the unit inertia constant M and the braking constant D to be set in the simulated inertia inverter 20, performs a simulation of the power system, and selects the values of the unit inertia constant M and the braking constant D so that the responses such as the voltage and phase of the center of inertia location and the response of the measuring instrument location approach each other.

[0022] Specifically, for example, the dynamic characteristic calculation unit 106 calculates the location of the center of inertia in the power system according to a plurality of conditions by using the information included in the power system database 108.

[0023] Also, the setting calculation unit 102 selects (calculates) the inertia setting values so that the response of the center of inertia location in the power system and the response of the measuring instrument location approach each other by using the center of inertia location calculated by the dynamic characteristic calculation unit 106 and a plurality of conditions.

[0024] Next, the communication unit 103 communicates with the simulated inertia inverter 20. For example, it is the part that communicates the inertia setting values calculated by the setting calculation unit 102 to the simulated inertia inverter 20. Also, for example, it is the part for communicating the measurement information (measurement data) from the measuring instrument necessary for estimating inertia in the inertia estimation unit 104.

[0025] The inertia estimation unit 104 is responsible for estimating the inertia of the power system. One example of an inertia estimation method used by the inertia estimation unit 104 is the use of inter-area oscillation described in Non-Patent Literature 1. In addition, various methods can be used, such as a method that considers the entire power system as a single generator and applies a high-pass filter (HPF) to the frequency change rate or frequency and the active power output fluctuation to estimate the inertia.

[0026] Furthermore, the inertia estimation unit 104 selects, for example, a measuring instrument to be used for inertia estimation. Then, it estimates the inertia in the power system using the measurement data obtained from the selected measuring instrument. The estimated inertia includes the inertia setting value set in the simulated inertia inverter 20 by the setting calculation unit 102.

[0027] The inertia calculation unit 105 is responsible for calculating the actual inertia of the power system. The inertia of the power system estimated by the inertia estimation unit 104 includes the inertia set value set in the simulated inertia inverter 20. Therefore, the inertia calculation unit 105 calculates the actual inertia of the power system by subtracting the inertia set value set in the simulated inertia inverter 20 from the inertia estimated by the inertia estimation unit 104.

[0028] The dynamic characteristics calculation unit 106 is the part that simulates the behavior of the power system, such as voltage and frequency, in the time domain. It is used to calculate the center of inertia under various conditions by changing conditions such as the generator, simulated inertia inverter 20, load conditions, and power system configuration. The calculated center of inertia, along with the calculation conditions, is stored in the center of inertia database 110. For example, the Y method developed by the Central Research Institute of Electric Power Industry can be used as the dynamic characteristics calculation unit 106.

[0029] The simulated inertial inverter database 107 is a database that holds information about at least the placement locations and rated capacities of the simulated inertial inverters 20.

[0030] The power system database 108 holds information on equipment present in the power system, such as generators and transmission / distribution lines, and includes values ​​such as generator capacity and reactance, and transmission / distribution line resistance and reactance, which are necessary for simulations performed by the dynamic characteristics calculation unit 106.

[0031] The measuring instrument database 109 is a database that stores information about at least the locations of PMUs installed in the power system. For example, it includes the locations in the power system of measuring instruments that acquire measurement information used in the inertia estimation unit 104.

[0032] The inertia center database 110 is a database for recording the calculation conditions and the inertia center locations calculated by the dynamic characteristics calculation unit 106. Before performing inertia estimation, it is desirable to perform simulations using the dynamic characteristics calculation unit 106 by changing the inertia setting value for the simulated inertia inverter 20, the operating conditions of the generator, the load state, etc., as calculation conditions, and to store the inertia center locations for each condition.

[0033] Furthermore, the simulation conditions included in the center of inertia database 110 may be stored together with the calculated calculation conditions, for example, by the dynamic characteristics calculation unit 106, which uses information such as the power system database 108 to calculate the center of inertia for each condition.

[0034] Although the setting calculation unit 102, inertia estimation unit 104, inertia calculation unit 105, and dynamic characteristics calculation unit 106 are described as individual elements, they may also be implemented as software that runs on the CPU 100.

[0035] Furthermore, although the simulated inertia inverter database 107, power system database 108, measuring instrument database 109, and inertia center location database 110 are described as multiple databases, they may also be stored in different areas of a single database. Alternatively, they may be stored in the storage unit 101.

[0036] The inertia estimation device 10 of the embodiment includes, for example, an inertia estimation unit 104 that estimates the inertia in a power system; a measuring instrument database 109 that includes at least the locations of measuring instruments in the power system that acquire measurement information used by the inertia estimation unit 104; a setting calculation unit 102 that calculates an inertia setting value to be set in a simulated inertia inverter 20; a communication unit 103 that communicates the calculated inertia setting value to the simulated inertia inverter 20; and an inertia calculation unit 105 that calculates the inertia in the power system based on the inertia estimated by the inertia estimation unit 104 and the calculated inertia setting value.

[0037] This allows the inertia estimation device 10 to control the simulated inertia of the simulated inertia inverter 20. Therefore, based on the estimated inertia in the power system and the inertia setting value set for the simulated inertia inverter 20, the center of inertia can be brought closer to the location where the PMU is located. Furthermore, for example, it is possible to check whether the center of inertia is approaching the location where the PMU is located based on the inertia calculated by the inertia calculation unit 105.

[0038] Next, Figure 2 shows an example of the configuration of the simulated inertia inverter 20 of the embodiment. The simulated inertia inverter 20 includes an inverter communication unit 200, a constant setting unit 201, a simulated inertia control unit 202, a voltage command value generation unit 203, a switching unit 204, and an output measurement unit 205.

[0039] The inverter communication unit 200 is the part that receives the inertia setting value to be set for the simulated inertia inverter 20 from the communication unit 103 of the inertia estimation device 10. It may also receive data that is communicated to other simulated inertia inverters 20.

[0040] Next, the constant setting unit 201 acquires the inertia setting value from the inverter communication unit 200 and sets the inertia setting value in the simulated inertia control unit 202. The constant setting unit 201 may be implemented as hardware or software.

[0041] The simulated inertia control unit 202 acquires the active power command value and active power output, and generates a phase command value. During this process, it controls the simulated inertia inverter 20 so that it exhibits the inertia characteristics of a generator (simulating inertial motion). Furthermore, the constant setting unit 201 sets the inertia setting value for the simulated inertia control unit 202.

[0042] Furthermore, the simulated inertia control unit 202 changes the set inertia setting value according to time, for example. It may also include a transfer function characteristic that allows for the setting of multiple inertia setting values ​​and the modification of multiple time-frequency characteristics. The control process will be described later.

[0043] The voltage command value generation unit 203 acquires the reactive power command value, reactive power output, voltage command value, and measured voltage, and generates a voltage command value. Automatic voltage regulation (AVR) can be used to generate the voltage command value, and this can be achieved by proportional-integral control, etc. It is not necessary to use both the reactive power command value and the voltage command value; the voltage command value may be generated using only one of them.

[0044] Furthermore, the measured voltage acquired by the voltage command value generation unit 203 is, for example, the voltage output from the simulated inertia inverter 20 and measured by the output measurement unit 205.

[0045] The active power command value, reactive power command value, and voltage command value acquired by the simulated inertia control unit 202 and the voltage command value generation unit 203 may also be received, for example, by communication from an energy management system (EMS) that controls the simulated inertia inverter 20. Alternatively, the active power command value, reactive power command value, and voltage command value may also be used as setting values ​​to be set on the simulated inertia inverter 20.

[0046] Next, the switching unit 204 obtains a voltage command value from the voltage command value generation unit 203 and a phase command value from the simulated inertia control unit 202. Based on the obtained voltage command value and phase command value, it is a device that converts DC to AC. Although the DC power source is not shown in the diagram, a DC power source such as a battery or solar power generation can be used.

[0047] The output measurement unit 205 is a device that measures the active power output, reactive power output, and measurement voltage flowing from the switching unit 204 to the power system. The measured active power output is used in the simulated inertia control unit 202 to generate a phase command value.

[0048] Furthermore, the reactive power output and measured voltage are used in the voltage command value generation unit 203 to generate a voltage command value. The output measurement unit 205 may be a single device or may be configured by combining multiple measuring instruments.

[0049] The simulated inertia inverter 20 that supplies simulated inertia to the power grid may be, for example, a voltage-controlled grid forming (GFM) inverter or a current-controlled grid following (GFL) inverter.

[0050] The simulated inertia inverter 20 of the embodiment includes, for example, a simulated inertia control unit 202 that controls the inverter to simulate the inertial motion of a generator, an inverter communication unit 200 that receives inertia set values ​​from the inertia estimation device 10, and a constant setting unit 201 that sets the inertia set values ​​in the simulated inertia control unit 202.

[0051] As a result, the simulated inertia inverter 20 can bring the center of inertia closer to the location where the PMU is placed by controlling the simulated inertia based on the inertia setpoint. Therefore, compared to the case where the center of inertia and the location where the PMU is placed are far apart, the deterioration in accuracy of inertia estimation by the PMU can be reduced.

[0052] Next, Figure 3 shows an example configuration of the simulated inertia control unit 202 of the embodiment. As shown in Figure 3, the simulated inertia control unit 202 calculates the active power deviation from the active power command value and active power output in order to simulate the inertial operation of the simulated inertia inverter 20. Next, a first-order lag element 1 / {M(t)s+D(t)} is applied to the active power deviation and the angular velocity command value is added. Then, the phase command value is calculated by applying an integral element ω0 / s with a gain of the rated angular velocity ω0. Note that s represents the Laplace operator.

[0053] Here, M(t) is a value representing the inertial characteristics of the generator (unit inertia constant), and D(t) is a value representing the braking characteristics (braking constant). The values ​​of M(t) and D(t) are constants that can be changed depending on the time period during which inertia estimation is performed. Therefore, by changing the values ​​of M(t) and D(t) according to the time period, the simulated inertia control unit 202 can bring the location of the measuring instrument closer to the center of inertia, thereby suppressing the deterioration of the accuracy of inertia estimation.

[0054] Furthermore, when the simulated inertia control unit 202 changes each constant, it does so linearly rather than in a stepwise manner to suppress oscillations caused by the change in the constants. The first-order lag element 1 / {M(t)s+D(t)} is set by the constant setting unit 201.

[0055] Figure 4 shows an example configuration of the simulated inertia control unit 202 of the embodiment. As shown in Figure 4, the simulated inertia control unit 202 determines the active power deviation from the active power command value and the active power output.

[0056] Next, the simulated inertia control unit 202 applies transfer characteristic elements H1(s,t) and H2(s,t) that can change the transfer characteristics according to the time frequency with respect to the active power deviation. It also has first-order lag elements 1 / (M1s+D1) and 1 / (M2s+D2) with different inertia set values ​​for each, and adds the angular velocity command value to the sum of their outputs. Then, by applying an integral element ω0 / s with a gain of the rated angular velocity ω0, the phase command value is calculated.

[0057] Furthermore, the settings for the transfer characteristic elements H1 and H2, and the first-order lag element can be set, for example, by the constant setting unit 201.

[0058] Next, Figure 5 shows an example of the angular frequency characteristics of the transfer characteristic elements H1 and H2 during inertia estimation operation in Configuration Example 2 of the simulated inertia control unit 202. As shown in Figure 5, the transfer characteristic element H1 has a BEF (Band Elimination Filter) characteristic with central angular velocity ω1 and angular velocity width Δω.

[0059] Furthermore, the transfer characteristic element H2 has a Band-Pass Filter (BPF) characteristic with a central angular velocity ω1 and an angular velocity width Δω. The central angular velocity ω1 can be the center frequency of the frequency band used when estimating inertia in the inertia estimation unit 104. The angular velocity width Δω can be the frequency bandwidth used when estimating inertia in the inertia estimation unit 104.

[0060] With this configuration, the simulated inertia control unit 202 can switch between the unit inertia constant M used for inertia estimation and other unit inertia constants M.

[0061] In other words, the inertia setting value that results in a desirable response for the simulated inertia inverter 20, which is not related to inertia estimation, is considered to be a different setting value from the inertia setting value necessary for adjusting the center of inertia (or the inertia estimation position). Therefore, by switching the unit inertia constant M, it is possible to achieve both a unit inertia constant M suitable for normal operation and a unit inertia constant M suitable for inertia estimation.

[0062] Note that the transfer characteristic elements H1 and H2 are illustrated as an example where the transfer characteristic is at its maximum of 1, but other values ​​are also possible. Furthermore, while the frequency characteristics are illustrated as a rectangular shape, window functions such as the Hanning window and Kaiser window can also be used. Additionally, the central angular velocity ω1 and angular velocity width Δω of the transfer characteristic elements H1 and H2 can be set to different values.

[0063] Next, Figure 6 shows an example of the angular frequency characteristics of transfer characteristic elements H1 and H2 when inertia estimation is not performed in Configuration Example 2 of the simulated inertia control unit 202. As shown in Figure 5, the characteristics of transfer characteristic element H1=1 and transfer characteristic element H2=0 can be set so that only the setting values ​​M1 and D1 of the first-order lag element in Figure 4 are effective.

[0064] This allows it to operate as a normal simulated inertia inverter 20, eliminating the influence of the inertia estimation function of the inertia estimation device 10. Although the transfer characteristics are described as being when inertia estimation is not being performed, it is not necessarily required to change the characteristics of the transfer characteristic elements H1 and H2 when inertia estimation is not being performed; they can always be kept as shown in Figure 5.

[0065] Next, Figure 7 is a flowchart showing an example of the inertia estimation process flow of the inertia estimation device 10 of the embodiment.

[0066] First, the setting calculation unit 102 sets the conditions (state) of the power system for estimating inertia in the power system (step S1). The setting calculation unit 102 also selects simulation conditions from the inertia center location database 110 that are close to the conditions for inertia estimation, based on obtainable conditions such as the stopped state of a generator.

[0067] Furthermore, the simulation conditions included in the center of inertia database 110 are stored together with the calculated calculation conditions, for example, by the dynamic characteristics calculation unit 106, which uses information such as the power system database 108 to calculate the center of inertia for each condition.

[0068] Next, the setting calculation unit 102 calculates inertia setting values ​​such that the placement locations of the measuring instruments included in the measuring instrument database 109 are closer to the center of inertia location, under the set power system conditions. The inertia estimation unit 104 also selects the measuring instruments to be used for inertia estimation (step S2).

[0069] Next, the inertia estimation unit 104 estimates the inertia in the power system using measurement data acquired from the selected measuring instrument (step S3). The inertia estimated by the inertia estimation unit 104 includes the inertia setting value set in the simulated inertia inverter 20.

[0070] Next, the inertia calculation unit 105 calculates the inertia in the actual power system by subtracting the inertia setting value set in the simulated inertia inverter 20 from the inertia estimated by the inertia estimation unit 104 (step S4).

[0071] As a result, the inertia estimation device 10 can bring the center of inertia closer to the location where the PMU is located by controlling the simulated inertia of the simulated inertia inverter 20. Therefore, compared to the case where the center of inertia and the location where the PMU is located are far apart, the deterioration in accuracy of inertia estimation by the PMU can be reduced.

[0072] Furthermore, it is possible to reduce the processing load required to calculate the value corresponding to the center of inertia using measurable data. In addition, it is possible to reduce the number of locations where PMUs are installed, thereby reducing the necessary equipment costs.

[0073] The program for executing various processes performed by the inertia estimation device 10 of the embodiment is provided pre-installed in ROM or the like. Alternatively, the program executed by the inertia estimation device 10 may be provided as a file in a format installable or executable by the inertia estimation device 10, recorded on a recording medium. Furthermore, the program may be stored on a computer connected to a network such as the Internet and provided by downloading it via the network.

[0074] A recording medium is a medium that can be read by a computer. Examples of recording media include CD (Compact Disc)-ROM, flexible disk (FD), CD-R (Recordable), DVD (Digital Versatile Disk), USB (Universal Serial Bus) memory, and SD (Secure Digital) card.

[0075] While several embodiments of the present invention have been described, these embodiments are presented as examples only and are not intended to limit the scope of the invention. These novel embodiments can be carried out in a variety of other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their variations are included in the scope and spirit of the invention, as well as in the claims of the invention and its equivalents. [Explanation of Symbols]

[0076] 10…Inertial estimation device 20… Simulated Inertia Inverter 100...CPU 101...Storage section 102...Setting calculation unit 103... Communications Department 104...Inertia estimation section 105...Inertia calculation section 106...Dynamic characteristics calculation section 107…Simulated Inertia Inverter Database 108... Power System Database 109... Measuring Instrument Database 110... Database of Center of Inertia Locations 200... Inverter Communication Unit 201... Constant setting section 202... Simulated Inertia Control Unit 203...Voltage command value generation unit 204…Switching section 205...Output measurement section

Claims

1. An inertia estimation system comprising an inertia estimation device for estimating inertia in a power grid, and a simulated inertia inverter, The inertia estimation device is, A measuring instrument database that includes at least the locations in the power system of measuring instruments that acquire measurement information used for inertia estimation, An inertia estimation unit for estimating the inertia in the power system, A setting calculation unit that calculates the inertia setting value to be set in the simulated inertia inverter, A communication unit that communicates the calculated inertia setting value, The system includes an inertia calculation unit that calculates the inertia in the power system based on the inertia estimated by the inertia estimation unit and the calculated inertia set value, The aforementioned simulated inertia inverter is, A simulated inertia control unit that simulates the inertial motion of a generator, An inverter communication unit that receives the aforementioned inertia set value, The system includes a constant setting unit that sets the inertia setting value to the simulated inertia control unit, Inertia estimation system.

2. The simulated inertia control unit changes the set inertia setting value according to time. The inertia estimation system according to claim 1.

3. The simulated inertia control unit includes a transfer function characteristic that allows multiple inertia setting values ​​to be set and multiple time-frequency characteristics to be changed. The inertia estimation system according to claim 1.

4. The inertia estimation device further comprises a dynamic characteristics calculation unit that calculates the center of inertia in the power system according to a plurality of conditions. The inertia estimation system according to claim 1.

5. The setting calculation unit calculates inertia setting values ​​such that the placement locations of the measuring instruments included in the measuring instrument database are closer to the center of inertia location. The inertia estimation system according to claim 4.

6. A measuring instrument database that includes at least the locations in the power system of measuring instruments that acquire measurement information used for inertia estimation, An inertia estimation unit for estimating the inertia in the power system, A setting calculation unit that calculates the inertia setting value to be set for the simulated inertia inverter, A communication unit that communicates the calculated inertia set value to the simulated inertia inverter, The system includes an inertia calculation unit that calculates the inertia in the power system based on the inertia estimated by the inertia estimation unit and the calculated inertia set value. Inertial estimation device.

7. A simulated inertia control unit that controls the generator to simulate its inertial motion, An inverter communication unit that receives inertia setpoints from an inertia estimation device, The system includes a constant setting unit that sets the inertia setting value to the simulated inertia control unit, Simulated inertia inverter.

8. Computers, An inertia estimation unit that estimates the inertia in the power system using a measuring instrument database that includes at least the locations of measuring instruments in the power system where measuring instruments that acquire measurement information are placed, A setting calculation unit that calculates the inertia setting value to be set for the simulated inertia inverter, A communication unit that communicates the calculated inertia set value to the simulated inertia inverter, An inertia calculation unit calculates the inertia in the power system based on the inertia estimated by the inertia estimation unit and the calculated inertia setting value, A program to make it work.

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