Equivalent inertia online measurement method, system and device and storage medium

Abstract

The invention discloses an equivalent inertia online measurement method, system and device, and a storage medium. The method comprises the following steps: obtaining frequency data and active power data of a grid-connected point in a specific time period before and after disturbance power injection; carrying out smoothing processing on the obtained frequency data and the active power data; determining a frequency steady-state value and an active power steady-state value before and after disturbance; calculating a steady-state power difference value between the active power steady-state values before and after the disturbance and a steady-state frequency difference value between the frequency steady-state values before and after the disturbance; determining an equivalent damping parameter of the to-be-tested unit or the to-be-tested station; calculating the damping power at each moment in the disturbance generation process; calculating inertia power at each moment in the disturbance generation process; calculating the frequency change rate of each moment in the disturbance generation process; and in a selected specific time period, determining the equivalent inertia of the to-be-tested unit or the to-be-tested station.

Description

Technical Field

[0001] The present invention belongs to the field of power system power generation, and relates to an equivalent inertia online measurement method, system, equipment and storage medium. Background Art

[0002] In recent years, the proportion of wind and solar energy stations connected to the power grid with power electronic converters as interfaces has continued to increase, and the scale has continued to expand. The power system has shown a "low inertia and weak damping" phenomenon, and the system's ability to resist disturbances has weakened. At the same time, with the construction and grid-connected operation of large-scale AC and DC power grids, the risk of large-power disturbances in the power system has increased, and the possibility of frequency instability in the system, resulting in machine shedding and load reduction, has increased.

[0003] The construction of new energy stations is restricted by geographical location, and their grid connection is widely distributed. Currently, research on the inertia level of new energy stations is mainly focused on the system level. Current inertia research relies heavily on phasor measurement units (PMUs). Online system inertia measurement methods, whether data-driven or model-fitting, require the use of PMUs to collect electrical quantities such as frequency, voltage, and current in real time. However, PMUs are not yet widely installed in power systems, which limits the application scope of these inertia measurement methods and keeps them at the theoretical research stage. Their feasibility and effectiveness in actual power system operation require further verification. At the same time, some scholars have used active generator switching and other methods in simulations to create disturbances for online inertia measurement, affecting the normal operation of the power system. This is also difficult to achieve in actual grid operation. Summary of the Invention

[0004] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and provide an equivalent inertia online measurement method, system, device and storage medium, which can measure the inertia of the station without a large disturbance event in the power system. At the same time, it has the characteristics of mobility and can measure the equivalent inertia of the power generation system at different nodes.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions: An online equivalent inertia measurement method includes the following steps: Obtaining frequency data and active power data at the grid connection point within a specific time period before and after the disturbance power is injected; performing smoothing processing on the acquired frequency data and the acquired active power data; Based on the smoothed frequency data and active power data, the steady-state frequency value and the steady-state active power value before and after the disturbance are determined; Calculating a steady-state power difference between steady-state active power values before and after the disturbance occurs, and a steady-state frequency difference between steady-state frequency values before and after the disturbance occurs; Determining an equivalent damping parameter of the unit or station to be tested based on the steady-state power difference and the steady-state frequency difference; Based on the determined equivalent damping parameters and the instantaneous frequency value during the disturbance process, the damping power at each moment during the disturbance process is calculated; Based on the smoothed active power data and the calculated damping power, the inertia power at each moment during the disturbance is calculated; the frequency change rate at each moment during the disturbance is calculated; Based on the calculated inertia power and frequency change rate, the equivalent inertia of the unit or station under test is determined within a selected specific time period.

[0006] Preferably, the process of smoothing the acquired frequency data and active power data is: applying low-pass filtering to the frequency data and active power data to remove high-frequency noise or oscillation components.

[0007] Preferably, the process of determining the steady-state value of frequency and the steady-state value of active power before and after the disturbance occurs is: selecting a time window before and after the disturbance occurs, and calculating the average value of multiple data points in the time window that meet the preset fluctuation limit conditions as the corresponding steady-state value.

[0008] Preferably, the process of calculating the inertia power at each moment during the disturbance is: comparing the smoothed active power value at each moment during the disturbance with the active power steady-state value before the disturbance occurs to obtain the active power change; subtracting the damping power calculated at the corresponding moment from the active power change to obtain the inertia power.

[0009] Preferably, the process of calculating the frequency change rate at each moment during the disturbance occurrence process is: using a numerical differentiation method to calculate the change rate of the smoothed frequency data over time.

[0010] Preferably, the numerical differentiation method adopts the central difference method and performs calculation based on a preset time step.

[0011] Preferably, the process of determining the equivalent inertia of the unit or station to be tested is: selecting a specific time period in the power response process after the disturbance occurs; calculating the ratio of the inertia power value at multiple moments in the specific time period to the frequency change rate at the corresponding moments; averaging the multiple calculated ratios to obtain the equivalent inertia.

[0012] An equivalent inertia online measurement system, comprising: A data acquisition module, configured to acquire frequency data and active power data at the grid connection point within a specific time period before and after the disturbance power is injected; a smoothing processing module, configured to perform smoothing on the acquired frequency data and the acquired active power data; A steady-state value calculation module is used to determine the steady-state value of frequency and the steady-state value of active power before and after the disturbance occurs based on the smoothed frequency data and active power data; A difference calculation module is used to calculate the steady-state power difference between the steady-state active power values before and after the disturbance occurs, and the steady-state frequency difference between the steady-state frequency values before and after the disturbance occurs; an equivalent damping parameter calculation module, configured to determine the equivalent damping parameter of the unit or station to be tested based on the steady-state power difference and the steady-state frequency difference; The equivalent damping calculation module at each moment is used to calculate the equivalent damping parameter at each moment during the disturbance process based on the determined equivalent damping parameter and the instantaneous frequency value during the disturbance process; The inertia power and frequency change rate calculation module is used to calculate the inertia power at each moment during the disturbance process based on the smoothed active power data and the calculated damping power; and calculate the frequency change rate at each moment during the disturbance process; The equivalent inertia calculation module is used to determine the equivalent inertia of the unit or station to be tested within a selected specific time period based on the calculated inertia power and frequency change rate.

[0013] A computer device comprises a memory, a processor and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the steps of the online equivalent inertia measurement method are implemented.

[0014] A computer-readable storage medium stores a computer program, which implements the steps of the online equivalent inertia measurement method when executed by a processor.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The present invention can use a movable disturbance power injection device to perform local disturbances on the generator sets and new energy stations in the power system, obtain filtered power and frequency data, theoretically and reasonably divide the transient and steady-state data required for calculation, decouple the inertia and damping effects in the frequency response process, and perform online evaluation of the equivalent inertia of the generator sets and new energy stations. This is of great significance for the stable operation of the new power system and the support capacity evaluation after the future large-scale new energy grid connection. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is an online measurement model of equivalent inertia of a new energy station based on disturbance power injection in an embodiment; Figure 2 This is a flow chart of an online measurement solution for equivalent inertia of a new energy station based on disturbance power injection in an embodiment; Figure 3 The smoothing results of the PCC point frequency and power data before and after the disturbance power injection in the embodiment; Figure 4 The damping power output results of the unit or station to be tested before and after the disturbance power injection in the embodiment; Figure 5 The inertia power output results of the unit or station to be tested before and after the disturbance power injection in the embodiment; Figure 6 The disturbance power injection point in the embodiment is based on the central difference method. Calculation results; Figure 7 The calculation result of the equivalent inertia at some moments after the disturbance power is injected in the embodiment; DETAILED DESCRIPTION In order to make the technical problems, technical solutions and beneficial effects solved by the present invention more clearly understood, the present invention is further described in detail in the following specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0017] The present invention provides an online measurement method for equivalent inertia based on a disturbance power injection technology, comprising the following steps: S1. First, a movable disturbance injection device is used to inject a specific disturbance power at the grid connection point of the unit or station under test, thereby inducing an inertia response and a primary frequency modulation process of the unit or station under test. S2. Measure the frequency data and power data of the unit to be tested or the station grid connection point in a specific time period before and after the disturbance power injection and smooth the data to obtain the power data after low-pass filtering. and frequency data ; S3. Use the N active power steady-state values and M frequency steady-state values before and after the disturbance to calculate the average value as the power steady-state reference value before and after the disturbance 、 and frequency steady-state reference value 、 , the equivalent damping coefficient is calculated using the power and frequency steady-state deviation ; S4. Using the equivalent damping coefficient Hedi The frequency deviation value at the moment is obtained The damping power at each moment is calculated based on the damping power, and the inertia power is obtained by using the central difference method under the preset step size at each moment. , and then calculate the equivalent inertia at each moment, combined with Time has come The inertia power at the moment is calculated and the average value of the calculation results is obtained, thus completing the equivalent inertia evaluation of the unit or station to be tested.

[0018] The invention discloses an online equivalent inertia measurement method based on a disturbance power injection technology. Its essence is to actively inject a certain size of power disturbance into the power system, thereby triggering the inertia response and primary frequency regulation process of the new energy unit or station, and stabilizing the frequency by adjusting the power output support; the equivalent damping parameter of the unit or station to be measured is calculated by using the steady-state value of the active power of the new energy unit or station before and after the disturbance after smoothing and the steady-state deviation value of the frequency at the grid connection point; and then the calculated equivalent damping parameter of the unit or station to be measured and the frequency deviation value at a certain moment are used to calculate the primary frequency regulation power of the unit or station to be measured at that moment, i.e., the damping power; thus, the inertia power of the unit or station to be measured at that moment is calculated by using the damping power of the unit or station to be measured at that moment and the power change of the unit or station to be measured, and then the central difference method is used in combination with a preset step size to calculate the , and finally by Time has come Power within the time range, The data is calculated to obtain the mean equivalent inertia of the unit or station to be tested.

[0019] Figure 2 This is a flow chart of an equivalent inertia online measurement method based on disturbance power injection technology proposed in the present invention. This embodiment can be applied to electronic devices, such as Figure 2 The equivalent inertia online measurement method based on the disturbance power injection technology shown includes the following steps: S1. Active disturbance injection at the grid connection point: First, in order to realize the online measurement of equivalent inertia of new energy units or stations, the present invention builds Figure 1 The dual-machine parallel-drive model shown uses two inverters with specific control strategies to simulate the system under test and the large power grid respectively, and uses a movable disturbance injection device to inject a specific disturbance active power at the corresponding grid connection point of the system under test; S2. Test data collection and smoothing: exist Figure 2 The new energy generating unit or station grid connection point shown collects active power data and frequency data within a pre-set time window before and after the disturbance power injection, and uses a low-pass filter with a reasonable cutoff frequency to smooth the power data and frequency data; S3. Calculation of equivalent damping parameters: The equivalent damping parameter is calculated using the deviation of the active power steady-state value and the frequency steady-state value before and after the disturbance power injection, and the damping power at each moment is calculated using the equivalent damping parameter and the deviation of the frequency at each moment compared to the steady-state value of the frequency before the disturbance injection; S4. Calculation of equivalent inertia parameters: The inertia power is calculated using the damping power at each moment and the active power data of the unit or station to be tested, and the central difference method is used to calculate the inertia power at each moment under the preset step size. The value is then substituted into the expression to calculate the equivalent inertia parameter.

[0020] The specific process of the above method is: S1. Active disturbance injection at the grid connection point: Based on Figure 1 The dual-unit towing model shown simulates the online measurement process of the unit or station to be tested, and uses a movable disturbance injection device to inject a specific disturbance power at the PCC point of the unit or station to be tested. The maximum injection value in this embodiment is 0.2 ( is the rated power of the unit or station to be tested) and the duration is 15 seconds. It causes the frequency and power changes of the unit or station to be tested to be as follows: Figure 3 shown.

[0021] S2. Test data collection and smoothing: Active power data measurement devices and frequency measurement devices are deployed at the grid connection points of new energy units or stations to obtain real-time sampling of active power data and frequency data before and after the injection of power disturbances. The collected active power data and frequency data are then smoothed, that is, digital filtering technology is used to remove high-frequency noise and oscillation components in the collected power and frequency data. The smoothed active power data is recorded as , the frequency data is recorded as In this embodiment, the active power data measuring device uses a high-precision power analyzer; the frequency measuring device uses a DSP chip high-speed calculation phase-locked loop to obtain the frequency signal; the real-time sampling frequency The frequency and power data obtained after smoothing are as follows: Figure 3 shown.

[0022] The smoothing process includes:

[0023] in, The original power data obtained by sampling, is the filter cutoff frequency, is the Laplace operator, is the smoothed power data after filtering;

[0024] in, The original power data obtained by sampling, is the filter cutoff frequency, is the smoothed power data after filtering.

[0025] S3. Calculation of equivalent damping parameters: Based on the smoothed frequency data And power data , get the data before and after the disturbance N The steady-state value of active power is M The average value of the frequency steady-state values is taken as the steady-state reference value of power and frequency before and after the disturbance occurs.

[0026] Obtain the steady-state frequency and active power values before and after the disturbance, including:

[0027]

[0028] in, Before the disturbance The steady-state power value at the moment, Before the disturbance The steady-state power value at the moment, After the disturbance occurs The steady-state power value at the moment, After the disturbance occurs The steady-state power value at the moment, The upper limit of power fluctuation when reaching steady-state value;

[0029]

[0030] in, Before the disturbance The steady-state frequency value at time , Before the disturbance The steady-state frequency value at time , After the disturbance occurs The steady-state frequency value at time , After the disturbance occurs The steady-state frequency value at time , The upper limit of the frequency fluctuation to reach the steady-state value.

[0031] This embodiment requires thatN The deviation between the steady-state value of active power and its next sampling moment shall not exceed 0.02 ,Right now:

[0032] in, is the rated power of the unit or station to be tested.

[0033] At the same time, it is required that M The deviation between the steady-state value of each frequency and the next sampling moment does not exceed 0.05Hz, that is:

[0034] In this embodiment N and M All are taken as 100. Then the steady-state power deviation is calculated from the above four steady-state reference values and steady-state frequency deviation .

[0035] According to the steady-state frequency value and the steady-state active power value before and after the disturbance, the difference between the steady-state active power value after the disturbance and the steady-state active power value before the disturbance and the difference between the steady-state frequency value before the disturbance and the steady-state frequency value after the disturbance are obtained:

[0036]

[0037]

[0038] in, is the steady-state power value before the disturbance occurs, is the steady-state power value after the disturbance occurs, and N is the amount of data within the upper limit of the power fluctuation. is the steady-state power deviation;

[0039]

[0040]

[0041] in, is the steady-state value of the frequency before the disturbance occurs, is the frequency steady-state value after the disturbance occurs, M is the amount of data within the upper limit of the frequency fluctuation, is the steady-state frequency deviation.

[0042] Then, the equivalent damping calculation formula is used to calculate the equivalent damping parameters of the new energy unit or station, namely:

[0043] in, is the equivalent damping parameter of the unit or station to be tested.

[0044] Then, using the equivalent damping parameter The calculation results and the damping power expression are combined with the i The frequency deviation at the moment of disturbance is calculated and obtained. i The damping power at the moment is:

[0045] in, is the damping power of the unit or station to be tested during the disturbance process, The first The frequency value at the moment. The calculated partial damping power data is as follows Figure 4 shown.

[0046] S4. Calculation of equivalent inertia parameters: According to the damping power and active power data, obtain the first i The inertia power at the moment is:

[0047] in, is the inertia response power of the unit or station to be tested during the disturbance process. like Figure 5 In order to calculate the equivalent inertia, it is necessary to calculate the i Frequency change rate at a moment This embodiment adopts the central difference method and selects 190ms as The measurement time window is calculated, and each moment It is obtained from the following formula:

[0048] Calculated like Figure 6 As shown. Then according to the starting time of the data To the end All , and combined with the inertia response power at the corresponding moment At time , use the following formula to calculate the equivalent inertia mean:

[0049] in, is the mean value of equivalent inertia, is the starting time of the data, is the end time of the data taken,T is the sampling time interval, For the The frequency change rate at the moment, For the The inertia response power at the moment. Refers to the first time that the power conversion quantity of the unit or station to be tested reaches ( The time of the maximum power conversion of the unit or station to be tested) and the end time Refers to the first time that the power conversion quantity of the unit or station to be tested reaches The equivalent inertia calculated during this time period is as follows: Figure 7 shown.

[0050] In the present invention, all expressions for calculating the equivalent inertia of new energy units or stations have parameter settings that comply with relevant grid regulations and standards, and can effectively evaluate grid-connected and online new energy power generation equipment. They are independent of load disturbances and system parameters. Therefore, the expressions for the equivalent inertia of new energy units or stations can be directly used in actual new energy unit or station inertia assessments.

[0051] The following are device embodiments of the present invention, which can be used to perform the method embodiments of the present invention. For details not disclosed in the device embodiments, please refer to the method embodiments of the present invention.

[0052] In another embodiment of the present invention, an equivalent inertia online measurement system is provided. The equivalent inertia online measurement system can be used to implement the above-mentioned equivalent inertia online measurement method. Specifically, the equivalent inertia online measurement system includes a data acquisition module, a smoothing processing module, a steady-state value calculation module, a difference calculation module, an equivalent damping parameter calculation module, an equivalent damping calculation module at each moment, an inertia power and frequency change rate calculation module, and an equivalent inertia calculation module.

[0053] The data acquisition module is used to acquire frequency data and active power data at the grid connection point in a specific time period before and after the disturbance power is injected.

[0054] The smoothing processing module is used to smooth the acquired frequency data and the active power data.

[0055] The steady-state value calculation module is used to determine the frequency steady-state value and the active power steady-state value before and after the disturbance occurs based on the smoothed frequency data and active power data.

[0056] The difference calculation module is used to calculate the steady-state power difference between the steady-state values of active power before and after the disturbance occurs, and the steady-state frequency difference between the steady-state values of frequency before and after the disturbance occurs.

[0057] The equivalent damping parameter calculation module is used to determine the equivalent damping parameter of the unit or station to be tested based on the steady-state power difference and the steady-state frequency difference.

[0058] The equivalent damping calculation module at each moment is used to calculate the equivalent damping parameter at each moment during the disturbance process based on the determined equivalent damping parameter and the instantaneous frequency value during the disturbance process.

[0059] The inertia power and frequency change rate calculation module is used to calculate the inertia power at each moment during the disturbance process based on the smoothed active power data and the calculated damping power; and calculate the frequency change rate at each moment during the disturbance process.

[0060] The equivalent inertia calculation module is used to determine the equivalent inertia of the unit or station under test within a selected specific time period based on the calculated inertia power and frequency change rate.

[0061] In another embodiment of the present invention, a terminal device is provided, which includes a processor and a memory. The processor described in the embodiment of the present invention can be used for the operation of the equivalent inertia online measurement method, including: obtaining frequency data and active power data at the grid connection point in a specific time period before and after the injection of disturbance power; smoothing the obtained frequency data and active power data; determining the frequency steady-state value and active power steady-state value before and after the disturbance occurs based on the smoothed frequency data and active power data; calculating the steady-state power difference between the active power steady-state values before and after the disturbance occurs, and the steady-state power difference between the active power steady-state values before and after the disturbance occurs. The invention relates to a method for determining an equivalent damping parameter of the unit or station to be tested based on the steady-state power difference and the steady-state frequency difference; calculating the damping power at each moment during the disturbance process based on the determined equivalent damping parameter and the instantaneous frequency value during the disturbance process; calculating the inertia power at each moment during the disturbance process based on the smoothed active power data and the calculated damping power; calculating the frequency change rate at each moment during the disturbance process; and determining the equivalent inertia of the unit or station to be tested within a selected specific time period based on the calculated inertia power and the frequency change rate.

[0062] In another embodiment, the present invention further provides a computer-readable storage medium (Memory), wherein one or more instructions in the computer-readable storage medium are loaded by a processor and execute the following steps: obtaining frequency data and active power data at the grid connection point in a specific time period before and after the disturbance power is injected; smoothing the obtained frequency data and active power data; determining the frequency steady-state value and active power steady-state value before and after the disturbance occurs based on the smoothed frequency data and active power data; calculating the steady-state power difference between the active power steady-state values before and after the disturbance occurs, and the difference between the steady-state power values before and after the disturbance occurs. the steady-state frequency difference between the previous and next steady-state frequency values; determining the equivalent damping parameter of the unit or station to be tested based on the steady-state power difference and the steady-state frequency difference; calculating the damping power at each moment during the disturbance based on the determined equivalent damping parameter and the instantaneous frequency value during the disturbance; calculating the inertia power at each moment during the disturbance based on the smoothed active power data and the calculated damping power; calculating the frequency change rate at each moment during the disturbance; and determining the equivalent inertia of the unit or station to be tested within a selected specific time period based on the calculated inertia power and frequency change rate.

[0063] It should be understood that the above description is for illustration and not for limitation. Many embodiments and many applications beyond the examples provided will be apparent to those skilled in the art upon reading the above description.

Claims

1. An online measurement method for equivalent inertia, characterized in that: The following processes are included: Obtaining frequency data and active power data at the grid connection point within a specific time period before and after the disturbance power is injected; performing smoothing processing on the acquired frequency data and the acquired active power data; Based on the smoothed frequency data and active power data, the steady-state frequency value and the steady-state active power value before and after the disturbance are determined; Calculating a steady-state power difference between steady-state active power values before and after the disturbance occurs, and a steady-state frequency difference between steady-state frequency values before and after the disturbance occurs; Determining an equivalent damping parameter of the unit or station to be tested based on the steady-state power difference and the steady-state frequency difference; Based on the determined equivalent damping parameters and the instantaneous frequency value during the disturbance process, the damping power at each moment during the disturbance process is calculated; Based on the smoothed active power data and the calculated damping power, the inertia power at each moment during the disturbance is calculated; Calculate the frequency change rate at each moment during the disturbance; Based on the calculated inertia power and frequency change rate, the equivalent inertia of the unit or station under test is determined within a selected specific time period.

2. The online equivalent inertia measurement method according to claim 1, characterized in that: The process of smoothing the acquired frequency data and active power data is as follows: applying low-pass filtering to the frequency data and active power data to remove high-frequency noise or oscillation components.

3. The online equivalent inertia measurement method according to claim 1, characterized in that: The process of determining the steady-state value of frequency and the steady-state value of active power before and after the disturbance is as follows: a time window is selected before and after the disturbance, and the average value of multiple data points that meet the preset fluctuation limit conditions in the time window is calculated as the corresponding steady-state value.

4. The online equivalent inertia measurement method according to claim 1, characterized in that: The process of calculating the inertia power at each moment during the disturbance is as follows: the smoothed active power value at each moment during the disturbance is compared with the steady-state active power value before the disturbance to obtain the active power change; and the damping power calculated at the corresponding moment is subtracted from the active power change to obtain the inertia power.

5. The online equivalent inertia measurement method according to claim 1, characterized in that: The process of calculating the frequency change rate at each moment during the disturbance is as follows: for the smoothed frequency data, the numerical differentiation method is used to calculate its change rate over time.

6. The online equivalent inertia measurement method according to claim 5, characterized in that: The numerical differentiation method uses the central difference method and is calculated based on a preset time step.

7. The online equivalent inertia measurement method according to claim 1, characterized in that: The process of determining the equivalent inertia of the unit or station to be tested is as follows: selecting a specific time period in the power response process after the disturbance occurs; calculating the ratio of the inertia power value at multiple moments in the specific time period to the frequency change rate at the corresponding moments; The multiple ratios calculated are averaged to obtain the equivalent inertia.

8. An equivalent inertia online measurement system, characterized in that: include: A data acquisition module, configured to acquire frequency data and active power data at the grid connection point within a specific time period before and after the disturbance power is injected; a smoothing processing module, configured to perform smoothing on the acquired frequency data and the acquired active power data; A steady-state value calculation module is used to determine the steady-state value of frequency and the steady-state value of active power before and after the disturbance occurs based on the smoothed frequency data and active power data; A difference calculation module is used to calculate the steady-state power difference between the steady-state active power values before and after the disturbance occurs, and the steady-state frequency difference between the steady-state frequency values before and after the disturbance occurs; an equivalent damping parameter calculation module, configured to determine the equivalent damping parameter of the unit or station to be tested based on the steady-state power difference and the steady-state frequency difference; The equivalent damping calculation module at each moment is used to calculate the equivalent damping parameter at each moment during the disturbance process based on the determined equivalent damping parameter and the instantaneous frequency value during the disturbance process; The inertia power and frequency change rate calculation module is used to calculate the inertia power at each moment during the disturbance based on the smoothed active power data and the calculated damping power; Calculate the frequency change rate at each moment during the disturbance; The equivalent inertia calculation module is used to determine the equivalent inertia of the unit or station to be tested within a selected specific time period based on the calculated inertia power and frequency change rate.

9. A computer device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the computer program, the steps of the online equivalent inertia measurement method according to any one of claims 1 to 7 are implemented.

10. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the steps of the online equivalent inertia measurement method according to any one of claims 1 to 7 are implemented.

Images