Broadband oscillation source identification method and device, electronic equipment and storage medium

Abstract

The application provides a wideband oscillation source identification method. The method comprises the following steps: acquiring wideband measurement data in a wideband oscillation alarm period; calculating a steady-state fundamental component and an oscillation component of a voltage amplitude according to the wideband measurement data; calculating a voltage amplitude ratio by taking the ratio of the voltage amplitude oscillation component and the steady-state fundamental component at the corresponding moment; comparing the voltage amplitude ratios of different measurement points, and determining the wideband oscillation source according to the maximum voltage amplitude ratio. The method is not affected by device measurement deviation and system parameter deviation, can accurately and reliably identify the wideband oscillation source, and has strong adaptability.

Description

Technical Field

[0001] This application relates to the field of power systems and their automation technology, specifically to a broadband oscillation source identification method, device, electronic device, and storage medium. Background Technology

[0002] Broadband oscillations in power systems include low-frequency oscillations (0.1–2.5 Hz), subsynchronous / supersynchronous oscillations (5–95 Hz), and medium / high-frequency oscillations (100–2500 Hz). Due to the increasing proportion of renewable energy sources in the power grid and the growing penetration rate of power electronic equipment, the risk of broadband oscillations in new power systems is increasing. Traditional power plants (hydropower, thermal power, nuclear power), renewable energy plants (wind power, photovoltaic), and energy storage power stations can all generate broadband oscillations. When broadband oscillations occur, both plant and grid users should quickly determine whether the oscillation source is located at the plant or the grid. For oscillation sources within the plant, it is necessary to identify the specific oscillating unit, power source, or load to facilitate targeted handling.

[0003] Currently, the industry has broadband measurement technologies and devices for monitoring broadband oscillations in power systems. These devices can measure voltage, current, and power, analyze and calculate fundamental, harmonic, and interharmonic frequencies, determine the type, amplitude, and frequency of the dominant oscillation, and provide broadband oscillation alarms. However, research on oscillation source identification is still insufficient, and a systematic and reliable method for broadband oscillation source identification is lacking. For example, for low-frequency oscillation source identification, current methods mainly rely on comparing the phase relationship between the angular frequency fluctuation phasor and the power fluctuation phasor. However, the angular frequency fluctuation in actual engineering may be very small, making accurate phase calculation impossible. For mid- to high-frequency oscillations of subsynchronous / supersynchronous oscillations, current methods require accurate measurement of the voltage and current phase at the dominant oscillation frequency. This method may yield incorrect results when the signal-to-noise ratio is low.

[0004] As the power system develops towards a higher proportion of renewable energy and a higher penetration rate of power electronics, the risk of broadband oscillations is increasing, and the need for broadband oscillation source identification will become increasingly urgent. Therefore, it is necessary to study a highly adaptable and reliable broadband oscillation source identification method, which can help improve the safe and stable operation of the power grid. Summary of the Invention

[0005] The purpose of this invention is to address the increasing risk of broadband oscillations in new power systems by proposing a method for identifying broadband oscillation sources, so as to accurately and reliably determine the oscillation sources and provide guidance for broadband oscillation mitigation.

[0006] To achieve the above objectives, this application adopts the following technical solution:

[0007] The first aspect of this application proposes a method for identifying broadband oscillation sources, including:

[0008] Acquire broadband measurement data during the broadband oscillation alarm period;

[0009] Calculate the steady-state fundamental component and oscillatory component of the voltage amplitude based on the broadband measurement data;

[0010] The voltage amplitude ratio is obtained by calculating the ratio of the voltage amplitude oscillation component to the steady-state fundamental component at the corresponding moment.

[0011] Compare the voltage amplitude ratios at different measurement points, and determine the broadband oscillation source based on the maximum voltage amplitude ratio.

[0012] According to some embodiments, the calculation of the steady-state fundamental component and oscillation component of the voltage amplitude based on the broadband measurement data includes:

[0013] The broadband oscillation type is determined based on the broadband measurement data, and the broadband oscillation type includes: low-frequency oscillation, sub / supersynchronous oscillation, and medium / high-frequency oscillation;

[0014] Calculate the steady-state fundamental component and oscillation component of the voltage amplitude based on the broadband oscillation type.

[0015] According to some embodiments, determining the broadband oscillation type based on the broadband measurement data includes: determining the broadband oscillation type based on the active power-dominant oscillation frequency in the broadband measurement data.

[0016] According to some embodiments, in the calculation of the steady-state fundamental component and oscillation component of the voltage amplitude based on the broadband oscillation type, the method for determining the steady-state fundamental component is as follows:

[0017] If the broadband oscillation type is low-frequency oscillation, then the minimum amplitude U of the positive sequence voltage within one oscillation cycle is taken. 1,min As the steady-state fundamental component value;

[0018] If the broadband oscillation type is subsynchronous / supersynchronous oscillation or medium / high frequency oscillation, then the voltage fundamental amplitude is directly taken as the steady-state fundamental component value.

[0019] According to some embodiments, in the calculation of the steady-state fundamental component and oscillation component of the voltage amplitude based on the broadband oscillation type, the method for determining the oscillation component is as follows:

[0020] The wideband oscillation type is a low-frequency oscillation, and the maximum amplitude U of the positive sequence voltage within one oscillation cycle of the oscillation phase is taken. 1,max With minimum amplitude U 1,min The difference ΔU1 is taken as the oscillation component;

[0021] The broadband oscillation type is subsynchronous / supersynchronous oscillation or medium / high frequency oscillation. Firstly, based on the fundamental power frequency f1 and the dominant power oscillation frequency f1 obtained from broadband measurements... P,max Calculate the two voltage coupling frequency points fU,max1 and f U,max2 ,in

[0022] f U,max1 =|f P,max +f1|,f U,max2 =|f P,max -f1|

[0023] Next, the maximum phase voltage amplitude corresponding to the two voltage coupling frequency points is found in the broadband measurement data as the oscillation component.

[0024] According to some embodiments, comparing the voltage amplitude ratios at different measurement points and determining the broadband oscillation source based on the maximum voltage amplitude ratio includes:

[0025] Compare the voltage amplitude ratios on both sides of a component with series impedance characteristics; the side with the larger voltage amplitude ratio corresponds to a broadband oscillator.

[0026] According to some embodiments, the element having series impedance characteristics includes transformers and reactors.

[0027] According to some embodiments, comparing the voltage amplitude ratios at different measurement points and determining the broadband oscillation source based on the maximum voltage amplitude ratio includes: comparing the voltage amplitude ratios on both sides of the components with series impedance characteristics in each branch, with the position of the largest voltage amplitude ratio corresponding to the broadband oscillation source.

[0028] According to some embodiments, comparing the voltage amplitude ratios at different measurement points and determining the broadband oscillation source based on the maximum voltage amplitude ratio includes:

[0029] First, compare the voltage amplitude ratio on both sides of some components with series impedance characteristics. The side with the larger voltage amplitude ratio corresponds to the broadband oscillator, so as to preliminarily determine the side where the broadband oscillator is located.

[0030] Further comparison of the voltage amplitude ratios of each branch on the side where the broadband oscillator is located reveals that the branch with the largest voltage amplitude ratio corresponds to the broadband oscillator.

[0031] A second aspect of this application discloses a broadband oscillation source identification device, characterized in that it includes a data acquisition unit, a component calculation unit, a voltage amplitude ratio calculation unit, and an oscillation source identification unit, wherein:

[0032] The data acquisition unit is used to acquire broadband measurement data during the broadband oscillation alarm period;

[0033] The component calculation unit is used to calculate the steady-state fundamental component and oscillation component of the voltage amplitude based on the broadband measurement data.

[0034] The voltage amplitude ratio calculation unit is used to calculate the ratio of the voltage amplitude oscillation component to the steady-state fundamental component at the corresponding moment to obtain the voltage amplitude ratio.

[0035] The oscillation source identification unit is used to compare the voltage amplitude ratio at different measurement points and determine the broadband oscillation source based on the maximum voltage amplitude ratio.

[0036] A third aspect of this application discloses an electronic device, comprising: a processor; and a memory storing computer instructions that, when executed by the processor, cause the processor to perform the broadband oscillation source identification method described above.

[0037] The fourth aspect of this application proposes a non-transient computer storage medium storing a computer program that, when executed by multiple processors, causes the processors to perform the broadband oscillation source identification method described above.

[0038] Compared with existing technologies, the technical solution adopted in this application has the following technical advantages: The solution of this application can identify the oscillation source of various broadband oscillations (low-frequency oscillations, sub / supersynchronous oscillations, and medium / high-frequency oscillations). By using the amplitude ratio of the voltage oscillation component to the steady-state fundamental component for oscillation source determination, it is unaffected by device measurement deviations and system parameter deviations, has low requirements for data signal-to-noise ratio, and can be applied to various scenarios such as conventional power plants, new energy power plants, and energy storage power plants, exhibiting strong adaptability and reliability. Attached Figure Description

[0039] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0040] Figure 1 This is a schematic diagram of a broadband oscillation source identification process according to an embodiment of this application;

[0041] Figure 2 This is a schematic diagram showing a generator unit connected to the power grid via a transformer.

[0042] Figure 3 Equivalent maps of the steady-state fundamental components and voltage distribution of the generating unit and the power grid;

[0043] Figure 4 The diagram shows the equivalent values ​​of the oscillation components and voltage distribution of the generating unit and the power grid, with the oscillation source located in the generating unit.

[0044] Figure 5 The diagram shows the equivalent values ​​of the oscillation components and voltage distribution of the generating unit and the power grid, with the oscillation source located in the power grid.

[0045] Figure 6This is a schematic diagram showing two generating units connected in parallel to the power grid.

[0046] Figure 7 A schematic diagram of a complex power grid containing multiple generating units and transformers;

[0047] Figure 8 This is a schematic diagram of the waveform and voltage oscillation components in a low-frequency oscillation case.

[0048] Figure 9 A schematic diagram of the waveform and voltage oscillation components for a subsynchronous / supersynchronous oscillation case;

[0049] Figure 10 This is a schematic diagram of a broadband oscillation source identification device according to an embodiment of this application;

[0050] Figure 11 This is a structural diagram of an electronic device provided in this application. Detailed Implementation

[0051] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0052] It should be understood that the terms "comprising" and "including" used in the specification and claims of this application indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0053] Figure 1 This is a flowchart of a broadband oscillation source identification method according to an embodiment of the present application, including processes S10 to S40.

[0054] In S10, acquire broadband measurement data for the broadband oscillation alarm period.

[0055] The broadband measurement data comes from a broadband measurement device or a measurement device with similar functions. The broadband measurement data includes voltage and current measurements of the fundamental frequency, the 2nd to 50th harmonics, and the 5th to 2500Hz interharmonics, as well as the maximum power oscillation value and its corresponding frequency of 0.1 to 2500Hz.

[0056] In S20, the steady-state fundamental component and oscillation component of the voltage amplitude are calculated based on the broadband measurement data.

[0057] include:

[0058] S21: Determine the broadband oscillation type based on the broadband measurement data. The broadband oscillation type includes: low-frequency oscillation, sub / supersynchronous oscillation, and medium / high-frequency oscillation. Specifically, the broadband oscillation type is determined based on the dominant oscillation frequency of active power in the broadband measurement data, and is specifically divided into three categories: low-frequency oscillation (0.1–2.5 Hz), sub / supersynchronous oscillation (5–95 Hz), and medium / high-frequency oscillation (100–2500 Hz).

[0059] S22: Calculate the steady-state fundamental component and oscillation component of the voltage amplitude according to the broadband oscillation type.

[0060] The steady-state fundamental component corresponds to the steady-state value of the fundamental voltage; the fundamental frequency refers to the component close to the rated frequency of the power grid, such as a 50Hz power grid, and signals of 45 to 55Hz belong to the fundamental component.

[0061] For low-frequency oscillations, the fundamental voltage amplitude fluctuates. We take the minimum amplitude U of the positive-sequence voltage within one oscillation cycle. 1,min As a steady-state fundamental wave component, according to the superposition principle, the fluctuation part based on this is an oscillating component.

[0062] For subsynchronous / supersynchronous oscillations or medium / high frequency oscillations, the amplitude of the voltage fundamental wave is basically stable, so the amplitude of the voltage fundamental wave is directly taken as the steady-state fundamental wave component value.

[0063] For low-frequency oscillations, the oscillation component is taken as the fluctuation of the positive sequence voltage amplitude; specifically, it is taken as the maximum amplitude U of the positive sequence voltage within one oscillation cycle of the oscillation phase. 1,max With minimum amplitude U 1,min The difference ΔU1 is taken as the oscillation component. The waveform recording curve of the low-frequency oscillation and the selection of the oscillation component are as follows: Figure 8 As shown.

[0064] For subsynchronous / supersynchronous oscillations or medium / high frequency oscillations, firstly, based on the fundamental power frequency f1 and the dominant power oscillation frequency f1 obtained from wideband measurements... P,max Calculate the two voltage coupling frequency points f U,max1 and f U,max2 ,in:

[0065] f U,max1 =|f P,max +f1|,f U,max2 =|f P,max -f1|

[0066] Secondly, the maximum phase voltage amplitude corresponding to the two voltage coupling frequency points mentioned above is found in the broadband measurement data and used as the oscillation component. The waveform recording curve of the supersynchronous oscillation and the selection of the oscillation component are as follows. Figure 9 As shown.

[0067] In S30, the voltage amplitude ratio is obtained by calculating the ratio of the voltage amplitude oscillation component to the steady-state fundamental component at the corresponding time.

[0068] Dividing the voltage amplitude oscillation component by the steady-state fundamental component at the corresponding moment yields a ratio in percentage or decimal form, known as the voltage amplitude ratio. The voltage amplitude ratio has a per-unit value characteristic, allowing comparisons between different voltage levels.

[0069] In S40, the voltage amplitude ratios at different measurement points are compared, and the broadband oscillation source is determined based on the maximum voltage amplitude ratio.

[0070] Specifically, this involves comparing the voltage amplitude ratio across a component with series impedance characteristics; the side with the larger voltage amplitude ratio corresponds to a broadband oscillator. Components with series impedance characteristics include transformers and reactors. This is because the oscillating voltage component and the steady-state fundamental voltage have different relative magnitudes on either side of the isolation component. The oscillating voltage component has its maximum value at the oscillator source; therefore, the location of the broadband oscillator source can be determined based on the magnitude of the voltage amplitude ratio.

[0071] by Figure 2 The system shown is connected to the power grid via a transformer, and we assume that this system experiences broadband oscillations. Based on the superposition principle, the system can be decomposed into the following values: Figure 3 The steady-state fundamental component contour plots and Figure 4 Figure 5 The oscillation component contour plot is shown.

[0072] The distribution of the steady-state fundamental component and oscillating component of the voltage in the power grid shows the following patterns:

[0073] The voltage oscillation component has a maximum value at the oscillation source (adjusted according to the transformer turns ratio when crossing voltage levels). The voltage gradually decreases across impedance components such as transformers and transmission lines, reaching zero at a distance from the power grid; that is, its equivalent circuit is a single-ended power supply system. When the oscillation source is a generator unit, the voltage oscillation component distribution is as follows: Figure 4 As shown; when the oscillation source is in the power grid, the voltage oscillation component distribution is as follows. Figure 5 As shown.

[0074] The steady-state fundamental voltage is relatively stable across the entire power grid, remaining near its rated voltage value. Therefore, its equivalent circuit is a two-terminal power supply system, with the power supplies at both ends being roughly the same. The steady-state fundamental voltage distribution is as follows: Figure 3 As shown.

[0075] Therefore, the ratio of the voltage amplitude oscillation component to the steady-state fundamental component is used to determine the location of the oscillation source.

[0076] Compare the voltage amplitude ratios on both sides of a component with series impedance characteristics, such as a transformer or reactor. The side with the larger amplitude ratio corresponds to a broadband oscillator. If the broadband oscillator is located within a power plant, the measurement point corresponding to the oscillator within the power plant has the largest voltage amplitude ratio. If the oscillator is located in the power grid, the measurement point with the largest voltage amplitude ratio in the power grid corresponds to the broadband oscillator.

[0077] In some embodiments, where there are multiple branches within the power plant and / or on the power grid, the voltage amplitude ratios across components with series impedance characteristics on each branch can be compared. The location with the largest voltage amplitude ratio corresponds to a broadband oscillator. For example... Figure 6 The diagram shows two generator units connected in parallel to the power grid. If generator unit G1 is the oscillation source, then generator unit G2 and its transformer are equivalent to part of the external power grid. In the diagram, P2 and P4 have the same amplitude ratio because they are connected to the same bus. When generator unit G1 is the oscillation source, P1 has the largest voltage amplitude ratio, followed by P2 and P4, and P3 has the smallest. Therefore, the branch containing P1 corresponds to a broadband oscillation source.

[0078] In some embodiments, comparing the voltage amplitude ratios at different measurement points and determining the broadband oscillator source based on the maximum voltage amplitude ratio includes: first comparing the voltage amplitude ratios on both sides of a component with series impedance characteristics; the side with the larger voltage amplitude ratio corresponds to the broadband oscillator source, thus initially determining the side where the broadband oscillator source is located; further comparing the voltage amplitude ratios of each branch on the side where the broadband oscillator source is located; the branch with the largest voltage amplitude ratio corresponds to the broadband oscillator source. This distributed calculation method can greatly reduce the computational load when facing complex electrical topologies. For example, when a power plant has an oscillation alarm, the voltage amplitude ratios on both sides of a component with series impedance characteristics can be compared first; the side with the larger voltage amplitude ratio corresponds to the broadband oscillator source, thus initially determining the side where the broadband oscillator source is located; further comparing the voltage amplitude ratios of each branch on the side where the broadband oscillator source is located; the branch with the largest voltage amplitude ratio corresponds to the broadband oscillator source.

[0079] For a specific power plant, one or more AC bays (power supply, load, or reactive power compensation equipment, etc.) are connected to the power grid via step-up transformers. If the power plant experiences an oscillation alarm, the relevant measuring points of each power plant on the grid side are disregarded initially. Only the voltage amplitude ratios on both sides of the step-up transformers for all AC bays of the power plant are compared. If the voltage amplitude ratio on the low-voltage side of a transformer is the largest, then the corresponding AC bay is the broadband oscillation source. If the voltage amplitude ratio on the high-voltage side of the transformer is the largest, then the broadband oscillation source is located on the grid side. When the broadband oscillation source is located on the grid side, the voltage amplitude ratios of the relevant measuring points of each power plant on the grid side are further compared. The power plant on the grid side with the largest voltage amplitude ratio is the broadband oscillation source. For a power plant on the grid side, if there are multiple AC bays within the power plant, the AC bays of the power plant on the grid side are further compared, and the AC bay with the largest voltage amplitude ratio is the broadband oscillation source.

[0080] like Figure 7 The complex power grid shown contains multiple generating units and transformers. The voltage amplitude ratio of each node can be calculated separately and compared with each other.

[0081] Using the voltage amplitude ratio method has the following technical advantages:

[0082] (1) It enables the comparison of different voltage levels through the per-unit amplitude ratio without the need for voltage level conversion and is not affected by transformer ratio error;

[0083] (2) By using the ratio calculation, the influence of errors in the primary voltage transformer (PT) and the sensors and sampling circuits within the device on the final calculation results is greatly eliminated. Since the signal amplitude of the oscillation component is usually small, the amplitude ratio method greatly improves the accuracy of the data, making this method highly reliable.

[0084] (3) Since power fluctuations are related to voltage and current fluctuations, and current fluctuations can also cause voltage fluctuations due to voltage drops across impedance, voltage amplitude fluctuations are almost always present at broadband oscillation sources. In engineering practice, there are no cases where there are only power fluctuations without voltage amplitude fluctuations. Therefore, this method has strong applicability. On the other hand, some other methods may not have the significant fluctuation amount (such as frequency) required by the method in some engineering cases, which may lead to the inability to correctly identify the oscillation source.

[0085] The following are the analysis results of several wideband oscillation cases in power plants, including the voltage amplitude ratio of the transformer voltage side (low-voltage side, i.e., the generating unit) and the transformer high-voltage side (high-voltage side), as well as the oscillation source identification results.

[0086]

[0087] As can be seen from the above cases, for units with oscillation sources, their voltage amplitude ratio is significantly higher than that of the high-voltage side of the transformer, which can be used to accurately identify the source of the oscillation. For units affected by disturbances due to parallel operation (such as Unit #2 in Cases 1 and 2), their voltage amplitude ratio is less than that of the high-voltage side of the transformer, thus indicating that they do not contribute to the oscillation.

[0088] Figure 10 The apparatus shown can perform a broadband oscillation source identification method according to the embodiments of this application.

[0089] like Figure 10 As shown, the broadband oscillation source identification device 50 includes: a data acquisition unit 51, a component calculation unit 52, a voltage amplitude ratio calculation unit 53, and an oscillation source identification unit 54.

[0090] The data acquisition unit 51 is used to acquire broadband measurement data during the broadband oscillation alarm period.

[0091] The component calculation unit 52 is used to calculate the steady-state fundamental component and oscillation component of the voltage amplitude based on the broadband measurement data.

[0092] The voltage amplitude ratio calculation unit 53 is used to calculate the voltage amplitude ratio by comparing the voltage amplitude oscillation component with the steady-state fundamental component at the corresponding time.

[0093] The oscillation source identification unit 54 is used to compare the voltage amplitude ratio at different measurement points and determine the broadband oscillation source based on the maximum voltage amplitude ratio.

[0094] The device performs functions similar to those described above; other functions are described in the preceding descriptions and will not be repeated here.

[0095] See Figure 11 , Figure 11 An electronic device is provided, including a processor and a memory. The memory stores computer instructions, which, when executed by the processor, cause the processor to perform the computer instructions to achieve the following: Figure 1 The method and its detailed scheme are shown.

[0096] It should be understood that the above-described device embodiments are merely illustrative, and the device disclosed in this invention can be implemented in other ways. For example, the division of units / modules described in the above embodiments is only a logical functional division, and there may be other division methods in actual implementation. For example, multiple units, modules, or components may be combined, integrated into another system, or some features may be ignored or not executed.

[0097] Furthermore, unless otherwise specified, the functional units / modules in the various embodiments of the present invention can be integrated into one unit / module, or each unit / module can exist physically separately, or two or more units / modules can be integrated together. The integrated units / modules described above can be implemented in hardware or as software program modules.

[0098] If the integrated unit / module is implemented in hardware, the hardware can be digital circuits, analog circuits, etc. The physical implementation of the hardware structure includes, but is not limited to, transistors, memristors, etc. Unless otherwise specified, the processor or chip can be any suitable hardware processor, such as a CPU, GPU, FPGA, DSP, and ASIC, etc. Unless otherwise specified, the on-chip cache, off-chip memory, and storage can be any suitable magnetic or magneto-optical storage medium, such as resistive random access memory (RRAM), dynamic random access memory (DRAM), static random access memory (SRAM), enhanced dynamic random access memory (EDRAM), high-bandwidth memory (HBM), hybrid memory cube (HMC), etc.

[0099] If the integrated unit / module is implemented as a software program module and sold or used as an independent product, it can be stored in a computer-readable storage device (CMD). Based on this understanding, the technical solution of this invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a memory and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this disclosure. The aforementioned memory includes various media capable of storing program code, such as USB flash drives, read-only memory (ROM), random access memory (RAM), portable hard drives, magnetic disks, or optical disks.

[0100] This application embodiment also provides a non-transitory computer storage medium storing a computer program, which, when executed by multiple processors, causes the processors to perform actions such as... Figure 1 The method and its detailed scheme are shown.

[0101] It should be clearly understood that this application describes how specific examples are formed and used, but this application is not limited to any details of these examples. Rather, based on the teachings of the disclosure of this application, these principles can be applied to many other embodiments.

[0102] Furthermore, it should be noted that the above figures are merely illustrative representations of the processes included in the method according to exemplary embodiments of this application, and are not intended to be limiting. It is readily understood that the processes shown in the above figures do not indicate or limit the temporal order of these processes. Additionally, it is readily understood that these processes may be executed synchronously or asynchronously, for example, in multiple modules.

[0103] The above embodiments are only for illustrating the technical concept of this application and should not be used to limit the scope of protection of this application. Any modifications made to the technical solution based on the technical concept proposed in this application shall fall within the scope of protection of this application.

Claims

1. A method for identifying a broadband oscillation source, characterized in that, include: Acquire broadband measurement data during the broadband oscillation alarm period; Calculate the steady-state fundamental component and oscillatory component of the voltage amplitude based on the broadband measurement data; The voltage amplitude ratio is obtained by calculating the ratio of the voltage amplitude oscillation component to the steady-state fundamental component at the corresponding moment. By comparing the voltage amplitude ratios at different measurement points, a broadband oscillation source is determined based on the maximum voltage amplitude ratio. The measurement points are selected as the two sides of a component with series impedance characteristics.

2. The method as described in claim 1, characterized in that, The calculation of the steady-state fundamental component and oscillation component of the voltage amplitude based on the broadband measurement data includes: The broadband oscillation type is determined based on the broadband measurement data. The broadband oscillation type includes: low-frequency oscillation, subsynchronous oscillation, supersynchronous oscillation, medium-frequency oscillation, and high-frequency oscillation. Calculate the steady-state fundamental component and oscillation component of the voltage amplitude based on the broadband oscillation type.

3. The method as described in claim 2, characterized in that, Determining the broadband oscillation type based on the broadband measurement data includes: determining the broadband oscillation type based on the active power-dominant oscillation frequency in the broadband measurement data.

4. The method as described in claim 2, characterized in that, In the calculation of the steady-state fundamental component and oscillation component of the voltage amplitude based on the broadband oscillation type, the method for determining the steady-state fundamental component is as follows: If the broadband oscillation type is low-frequency oscillation, then the minimum amplitude U of the positive sequence voltage within one oscillation cycle is taken. 1,min As the steady-state fundamental component value; If the broadband oscillation type is subsynchronous / supersynchronous oscillation or medium / high frequency oscillation, then the voltage fundamental amplitude is directly taken as the steady-state fundamental component value.

5. The method as described in claim 2, characterized in that, In the calculation of the steady-state fundamental component and oscillation component of the voltage amplitude based on the broadband oscillation type, the method for determining the oscillation component is as follows: The wideband oscillation type is a low-frequency oscillation, and the maximum amplitude U of the positive sequence voltage within one oscillation cycle of the oscillation phase is taken. 1,max With minimum amplitude U 1,min The difference ΔU1 is taken as the oscillation component; The broadband oscillation type is subsynchronous / supersynchronous oscillation or medium / high frequency oscillation. Firstly, based on the fundamental power frequency f1 and the dominant power oscillation frequency f1 obtained from broadband measurements... P,max Calculate the two voltage coupling frequency points f U,max1 and f U,max2 ,in in U,max1 =|f P,max +f1|,f U,max2 =|f P,max -f1| Next, the maximum phase voltage amplitude corresponding to the two voltage coupling frequency points is found in the broadband measurement data as the oscillation component.

6. The method as described in claim 1, characterized in that, The components with series impedance characteristics include transformers and reactors.

7. The method as described in claim 1, characterized in that, The step of comparing the voltage amplitude ratios at different measurement points and determining the broadband oscillation source based on the maximum voltage amplitude ratio includes: By comparing the voltage amplitude ratios on both sides of the components with series impedance characteristics in each branch, the position with the largest voltage amplitude ratio corresponds to the broadband oscillation source.

8. The method as described in claim 1, characterized in that, The step of comparing the voltage amplitude ratios at different measurement points and determining the broadband oscillation source based on the maximum voltage amplitude ratio includes: First, compare the voltage amplitude ratio on both sides of some components with series impedance characteristics. The side with the larger voltage amplitude ratio corresponds to the broadband oscillator, so as to preliminarily determine the side where the broadband oscillator is located. Further comparison of the voltage amplitude ratios of each branch on the side where the broadband oscillator is located reveals that the branch with the largest voltage amplitude ratio corresponds to the broadband oscillator.

9. A broadband oscillation source identification device, characterized in that, include: The data acquisition unit is used to acquire broadband measurement data during the broadband oscillation alarm period; The component calculation unit is used to calculate the steady-state fundamental component and oscillation component of the voltage amplitude based on the broadband measurement data. The voltage amplitude ratio calculation unit is used to calculate the ratio of the voltage amplitude oscillation component to the steady-state fundamental component at the corresponding moment to obtain the voltage amplitude ratio. The oscillation source identification unit is used to compare the voltage amplitude ratio at different measurement points and determine the broadband oscillation source based on the maximum voltage amplitude ratio. The measurement points are selected as the two sides of a component with series impedance characteristics.

10. An electronic device, characterized in that, include: processor; as well as A memory storing computer instructions that, when executed by the processor, cause the processor to perform the method according to any one of claims 1-8.

11. A non-transitory computer storage medium storing a computer program that, when executed by a plurality of processors, causes the processors to perform the method of any one of claims 1-8.

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