Measurement data driven broadband oscillation traceability method for power system

Abstract

The invention discloses a broadband oscillation traceability method for a power system driven by measurement data, and relates to the technical field of power system oscillation analysis. According to the invention, based on port voltage and current instantaneous measurement data of a power generation unit or a grid-connected node, a target broadband oscillation frequency is identified through frequency domain analysis, and corresponding voltage and current oscillation mode components are extracted; then constructing modal power under the modal to represent oscillation energy exchange characteristics; and finally, according to the sign and the change characteristic of the modal power, determining that the unit or the node which continuously injects oscillation energy into the system is a broadband oscillation source. The method is low in model dependency, visual in positioning and suitable for a new energy high-proportion power system, and provides a basis for oscillation suppression.

Description

Technical Field

[0001] This invention belongs to the field of power system oscillation analysis technology, and particularly relates to a measurement data-driven method for tracing the source of broadband oscillations in power systems. Background Technology

[0002] With the large-scale integration of new energy power generation, power electronic equipment, and flexible DC transmission technology into power systems, the system structure and dynamic characteristics have undergone profound changes. The introduction of numerous devices based on power electronic interfaces has significantly increased the number of control links and continuously expanded the time scale coverage. The traditional low-frequency oscillation problem, mainly characterized by electromechanical oscillations, has gradually evolved into a broadband oscillation problem involving subsynchronous oscillations, supersynchronous oscillations, and the interaction of multiple control links. Broadband oscillations are typically characterized by large frequency spans, complex excitation mechanisms, and concealed propagation paths. Once they occur, they can easily accumulate oscillatory energy in local areas of the system, seriously threatening the safe and stable operation of the power system.

[0003] After broadband oscillations occur, rapid and accurate identification of the oscillation source is a prerequisite for targeted suppression and control. However, existing oscillation source localization methods mostly rely on precise mathematical models of the system or internal mechanism analysis of specific devices. In the actual power grid operation environment where the proportion of new energy sources is constantly increasing and the uncertainty of system parameters is significantly enhanced, obtaining an accurate and complete system model is difficult, severely limiting the applicability of such model-driven methods. In addition, some localization methods based on wide-area signal characteristics or modal participation factor calculations often involve complex analysis processes, and the physical meaning of the final localization results is not intuitive enough, making it difficult to provide clear operational guidance for operators and failing to meet the urgent requirements of real-time and interpretable source tracing results in engineering sites.

[0004] Therefore, in the context of modern complex power systems with a high proportion of new energy sources and extensive access to power electronic equipment, there is an urgent need to study a method that can directly utilize field measurement data, intuitively reflect the direction of oscillation energy flow, and achieve rapid localization of broadband oscillation sources. This would overcome the shortcomings of existing technologies, such as reliance on models, insufficient adaptability, and unintuitive results, and provide a reliable and easy-to-apply basis for the subsequent formulation of effective broadband oscillation suppression measures. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention proposes a measurement data-driven broadband oscillation tracing method for power systems, thereby resolving the issues present in the prior art.

[0006] In a first aspect, to achieve the above objectives, the present invention provides a measurement data-driven method for tracing the source of broadband oscillations in power systems, comprising the following steps:

[0007] Acquire instantaneous measurement data of port voltage and current of multiple power generation units or grid-connected nodes in the power system, and preprocess the data;

[0008] Frequency domain analysis is performed on the preprocessed data to identify the target broadband oscillation frequency present in the system;

[0009] At the target broadband oscillation frequency, voltage oscillation mode components and current oscillation mode components are extracted from the data;

[0010] Based on the voltage oscillation mode components and current oscillation mode components, the modal power under the target broadband oscillation mode is calculated, and the modal power characterizes the energy exchange characteristics between ports.

[0011] Analyze the sign of the modal power and its characteristics as a function of time;

[0012] Based on the analysis results, power generation units or grid-connected nodes that continuously inject oscillating energy into the system over a period of time are identified as broadband oscillation sources.

[0013] Optionally, the process of preprocessing the data includes:

[0014] The instantaneous measurement data of the port voltage and current are filtered and denoised to eliminate the influence of noise and non-oscillatory components.

[0015] Optionally, the process of extracting the voltage oscillation mode component and the current oscillation mode component includes:

[0016] The data is analyzed in the frequency domain using fast Fourier transform or short-time Fourier transform to identify the target broadband oscillation frequency;

[0017] Frequency selection is performed near the target broadband oscillation frequency in the frequency domain, and the voltage oscillation mode component and current oscillation mode component are reconstructed by inverse Fourier transform.

[0018] Optionally, the process of calculating the modal power under the target broadband oscillation mode includes:

[0019] Based on the voltage oscillation mode components and current oscillation mode components, a power term containing alternating and non-alternating components is calculated.

[0020] The power term is subjected to low-pass filtering or time averaging to extract the non-alternating power component, which is then used as the modal power.

[0021] Optionally, the process of analyzing the sign of the modal power and its characteristics over time includes:

[0022] Under the condition that the direction of the current flowing into the port is positive, the direction of the oscillation energy flow is determined according to the sign of the modal power;

[0023] The modal power symbols within the analysis period are statistically analyzed for consistency. When the modal power remains the same symbol within a preset time window, it is determined that the corresponding port has a continuous oscillating energy injection or absorption behavior.

[0024] Optionally, the modal power is calculated by a moving average, wherein the window length of the moving average corresponds to the number of sampling points for one or more oscillation periods.

[0025] Secondly, the present invention also provides a measurement data-driven power system broadband oscillation tracing system for implementing a measurement data-driven power system broadband oscillation tracing method, the system comprising:

[0026] The data acquisition and preprocessing module is used to acquire instantaneous measurement data of port voltage and current of multiple power generation units or grid-connected nodes, and to preprocess the data.

[0027] The modal recognition and extraction module is used to perform frequency domain analysis on the preprocessed data to identify the target broadband oscillation frequency, and extract the voltage oscillation mode component and the current oscillation mode component at the target broadband oscillation frequency;

[0028] The modal power calculation module is used to calculate the modal power of the target broadband oscillation mode based on the voltage oscillation mode component and the current oscillation mode component;

[0029] The oscillation source location module is used to analyze the sign of the modal power and its characteristics of changing over time, and to identify the power generation unit or grid-connected node that continuously injects oscillation energy into the system as a broadband oscillation source based on the analysis results.

[0030] Thirdly, the present invention also provides a computer terminal device, comprising:

[0031] One or more processors;

[0032] A memory, coupled to the processor, for storing one or more programs;

[0033] When the one or more programs are executed by the one or more processors, the one or more processors implement the steps of the measurement data-driven power system broadband oscillation tracing method in the first aspect described above.

[0034] Fourthly, the present invention also provides a computer-readable storage medium having a computer program stored thereon, wherein when the computer program is executed by a processor, it implements the steps of the measurement data-driven power system broadband oscillation tracing method described in the first aspect above.

[0035] Fifthly, the present invention also provides a computer program product, including a computer program that, when executed by a processor, implements the steps of the measurement data-driven power system broadband oscillation tracing method described in the first aspect above.

[0036] Compared with the prior art, the present invention has the following advantages and technical effects:

[0037] This invention provides a measurement data-driven method for tracing broadband oscillations in power systems. The technical solution directly utilizes instantaneous measurement data of port voltage and current for broadband oscillation tracing, effectively reducing reliance on precise mathematical models of the system and improving the method's adaptability and practicality in complex power system environments with high proportions of renewable energy and uncertain parameters. By extracting oscillation mode components and constructing mode power through frequency domain analysis, the exchange and flow of oscillation energy between various generation units or grid-connected nodes can be intuitively characterized, making the location of broadband oscillation sources clear and easy for engineers to understand and apply. The method's calculation process is relatively simple, facilitating rapid identification of oscillation sources and providing a direct and reliable technical basis for subsequently developing targeted broadband oscillation suppression measures, thereby supporting the safe and stable operation of new power systems. Attached Figure Description

[0038] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0039] Figure 1 This is a schematic diagram of the overall process of the broadband oscillation tracing method according to an embodiment of the present invention. Detailed Implementation

[0040] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0041] It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions, and although a logical order is shown in the flowchart, in some cases the steps shown or described may be executed in a different order than that shown here.

[0042] Example 1

[0043] This invention proposes a data-driven broadband oscillation tracing method for power systems, which analyzes instantaneous measurements of power system port voltage and current. The method first acquires instantaneous three-phase voltage and current values ​​from multiple power generation units or key grid-connected nodes in the power system, and then preprocesses the measured data to eliminate the influence of noise and non-oscillatory components.

[0044] Based on this, frequency domain analysis is used to analyze the preprocessed measurement data, identify broadband oscillation frequencies in the system, and extract the corresponding voltage and current oscillation components at the identified target oscillation frequencies. Furthermore, modal power at the target oscillation frequency is constructed based on the voltage and current oscillation components. This is used to characterize the energy exchange characteristics of oscillation at each port. In the formula, Indicates the number of the power generation unit or grid connection node. The total number of power generation units or grid-connected nodes participating in the analysis in the system; the modal power corresponding to the target oscillation frequency is denoted as , used to represent the th . Oscillation energy exchange characteristics of a power generation unit or grid-connected node in the target broadband oscillation mode.

[0045] By analyzing the modal power The sign of the current and its time-varying characteristics, under the condition that the direction of the current flowing into the port is positive, when When, it indicates the first Each power generation unit or grid-connected node injects oscillating energy into the system, and is therefore identified as a broadband oscillation source.

[0046] like Figure 1 As shown, this embodiment provides a measurement data-driven broadband oscillation tracing method for power systems, including:

[0047] Acquire instantaneous measurement data of port voltage and current of multiple power generation units or grid-connected nodes in the power system, and preprocess the data;

[0048] Frequency domain analysis is performed on the preprocessed data to identify the target broadband oscillation frequency present in the system;

[0049] At the target broadband oscillation frequency, voltage oscillation mode components and current oscillation mode components are extracted from the data;

[0050] Based on the voltage oscillation mode components and current oscillation mode components, the modal power under the target broadband oscillation mode is calculated, and the modal power characterizes the energy exchange characteristics between ports.

[0051] Analyze the sign of the modal power and its characteristics as a function of time;

[0052] Based on the analysis results, power generation units or grid-connected nodes that continuously inject oscillating energy into the system over a period of time are identified as broadband oscillation sources.

[0053] As one implementation method in this embodiment, the process of preprocessing the data includes:

[0054] The instantaneous measurement data of the port voltage and current are filtered and denoised to eliminate the influence of noise and non-oscillatory components.

[0055] Specifically, this invention proposes a method for identifying and extracting broadband oscillation modes in power systems based on measurement data, which identifies and separates target broadband oscillation modes in the system. First, instantaneous measurement data of port voltage and current from multiple generation units or key grid-connected nodes in the power system are acquired, and the measurement data is preprocessed to eliminate the influence of noise and non-oscillatory components. Second, frequency domain analysis methods (such as FFT) are used to analyze the preprocessed measurement data to identify the broadband oscillation frequencies present in the system.

[0056] In one alternative implementation, the frequency domain analysis method may also employ short-time Fourier transform, continuous wavelet transform, or other time-frequency analysis methods to adapt to the situation where the broadband oscillation frequency changes over time. Finally, the corresponding voltage and current oscillation mode components are extracted at the identified target oscillation frequency to provide basic data for subsequent modal power calculation.

[0057] As one implementation method in this embodiment, the process of extracting the voltage oscillation mode component and the current oscillation mode component includes:

[0058] The data is analyzed in the frequency domain using fast Fourier transform or short-time Fourier transform to identify the target broadband oscillation frequency;

[0059] Frequency selection is performed near the target broadband oscillation frequency in the frequency domain, and the voltage oscillation mode component and current oscillation mode component are reconstructed by inverse Fourier transform.

[0060] Specifically, definition For a power system with a single generating unit or grid-connected node, the instantaneous voltage and current measurements at each port are as follows:

[0061] (1)

[0062] The instantaneous signal is discretely sampled at intervals of 1 / 2. The number of sampling points is The sampling point number is This yields a discrete sequence:

[0063] (2)

[0064] In the formula: and The voltage and current at each port are respectively on the 1st The instantaneous value at a discrete time point.

[0065] Frequency domain analysis of the discrete sequence is performed using FFT to obtain the spectral representations of voltage and current:

[0066] (3)

[0067] In the formula: For frequency point number, The imaginary unit, and They represent the first The voltage and current at the first port are... discrete frequency points The complex spectral value at that location.

[0068] By analyzing the spectral amplitude characteristics, the target broadband oscillation frequency in the system can be identified. And determine its corresponding frequency point number. Frequency selection is performed near the target frequency in the frequency domain, and the target oscillation mode components are reconstructed through inverse Fourier transform, yielding:

[0069] (4)

[0070] In the formula: The first The discrete sequence of voltage and current oscillation mode components at the target broadband oscillation frequency for each port. After extracting the oscillation mode components, amplitude threshold discrimination or energy ratio discrimination can be performed on the oscillation mode components to eliminate spurious oscillation components caused by noise or transient disturbances.

[0071] As one implementation method in this embodiment, the process of calculating the modal power under the target broadband oscillation mode includes:

[0072] Based on the voltage oscillation mode components and current oscillation mode components, a power term containing alternating and non-alternating components is calculated.

[0073] The power term is subjected to low-pass filtering or time averaging to extract the non-alternating power component, which is then used as the modal power.

[0074] Specifically, this invention proposes a modal power calculation method based on broadband oscillation mode components to characterize the energy exchange characteristics between various ports of a system. First, the port voltage and current are expressed as a superposition of the fundamental component and the target broadband oscillation mode component. Second, based on the oscillation mode voltage and current, a port power expression for the target oscillation mode is constructed. By analyzing different components of the power, non-alternating power components reflecting the energy injection or absorption characteristics of the oscillation are extracted, and corresponding modal power indices are defined. Finally, the modal power of each power generation unit or grid-connected node under the target broadband oscillation mode is obtained, characterizing its oscillation energy exchange characteristics.

[0075] Specifically, the port voltage and current are first expressed as a superposition of the fundamental component and the target broadband oscillation mode component:

[0076] (5)

[0077] In the formula: The first The fundamental voltage and fundamental current components of each port.

[0078] port The instantaneous power at a point is defined as:

[0079] (6)

[0080] Substituting equation (5) into equation (6), we can obtain that the port power consists of four parts.

[0081] (7)

[0082] In the formula: This is the steady-state power term formed by the fundamental voltage and fundamental current. This is the alternating power term formed by the interaction between the fundamental component and the oscillatory component; The power term is formed by the interaction of voltage and current components under the target broadband oscillation mode.

[0083] Define the target wideband oscillation mode. The modal power of each port is a pair Non-alternating component extraction results:

[0084] (8)

[0085] In the formula: For the first Modal power of each port in the target broadband oscillation mode. This represents a low-pass filter or equivalent time averaging operator used to filter out alternating power components.

[0086] In one specific implementation, the power of the broadband oscillation mode can be calculated using a moving average:

[0087] (9)

[0088] In the formula: The average window length corresponds to the number of sampling points for one or more oscillation cycles. To avoid the impact of short-term fluctuations on the source tracing results, the sign consistency of modal power can be statistically analyzed within the analysis period. When the modal power maintains the same sign within a preset time window, it is considered that there is continuous oscillatory energy injection or absorption behavior at the corresponding port.

[0089] As one implementation method in this embodiment, the process of analyzing the sign of the modal power and its characteristics of change over time includes:

[0090] Under the condition that the direction of the current flowing into the port is positive, the direction of the oscillation energy flow is determined according to the sign of the modal power;

[0091] The modal power symbols within the analysis period are statistically analyzed for consistency. When the modal power remains the same symbol within a preset time window, it is determined that the corresponding port has a continuous oscillating energy injection or absorption behavior.

[0092] As one implementation method in this embodiment, the modal power is calculated by moving average, and the window length of the moving average corresponds to the number of sampling points of one or more oscillation cycles.

[0093] Specifically, this invention proposes a broadband oscillation source localization method based on modal power characteristics to identify and determine the oscillation source. First, the modal power of each power generation unit or grid-connected node in the system under the target broadband oscillation mode is compared and analyzed. Second, under the condition of agreed-upon power positive and negative directions, the direction of broadband oscillation energy flow is determined based on the sign of the modal power and its time-varying characteristics. Finally, the power generation unit or grid-connected node continuously injecting oscillation energy into the system is identified as the broadband oscillation source, thereby achieving the source localization of broadband oscillations in the power system.

[0094] Specifically, under the condition that the direction of the current flowing into the port is positive, the direction of the oscillation power flow is determined based on the sign of the modal power:

[0095] (10)

[0096] During the analysis period, each power generation unit or grid-connected node in the system... The modal power within the range is statistically analyzed, when the following condition is met:

[0097] (11)

[0098] Then the corresponding first Each power generation unit or grid-connected node is identified as a broadband oscillation source.

[0099] Based on the above steps, effective tracing of broadband oscillation sources in power systems can be achieved. By identifying oscillation modes and constructing mode power, the exchange relationship of oscillation energy between various power generation units or grid-connected nodes in the system can be clarified, improving the accuracy and intuitiveness of broadband oscillation source location. This provides a reliable technical basis for the analysis and management of broadband oscillations in power systems, and thus provides strong support for the safe and stable operation of new power systems. Compared with existing methods based on system models or parameter identification, this invention can directly utilize field measurement data for analysis, making it suitable for complex power system scenarios with a high proportion of new energy sources, widespread access to power electronic equipment, and difficulty in obtaining system parameters, thus possessing strong engineering applicability.

[0100] Based on this, this invention provides a measurement data-driven method for tracing broadband oscillations in power systems. The technical solution directly utilizes instantaneous measurement data of port voltage and current for broadband oscillation tracing, effectively reducing the reliance on precise mathematical models of the system and improving the adaptability and practicality of the method in complex power system environments with high proportions of new energy and uncertain parameters. By extracting oscillation mode components and constructing mode power through frequency domain analysis, the exchange and flow of oscillation energy between various generation units or grid-connected nodes can be intuitively characterized, making the location of broadband oscillation sources clear and easy for engineers to understand and apply. The calculation process of this method is relatively simple, facilitating rapid identification of oscillation sources and providing a direct and reliable technical basis for subsequently developing targeted broadband oscillation suppression measures, thereby supporting the safe and stable operation of new power systems.

[0101] Example 2

[0102] In this embodiment, a computer terminal device is provided, including:

[0103] One or more processors;

[0104] A memory, coupled to the processor, for storing one or more programs;

[0105] When the one or more programs are executed by the one or more processors, the one or more processors implement the steps of the above-described measurement data-driven power system broadband oscillation tracing method.

[0106] In this embodiment, a computer-readable storage medium is also provided, on which a computer program is stored. When the computer program is executed by a processor, it implements the steps of the above-described measurement data-driven power system broadband oscillation tracing method.

[0107] In this embodiment, an electronic device is also provided, including a memory and a processor. The memory stores a computer program, and the processor is configured to run the computer program to perform the steps of the above-described measurement data-driven power system broadband oscillation tracing method.

[0108] In this embodiment, a computer program product is also provided, including a computer program that, when executed by a processor, implements the steps of the above-described measurement data-driven power system broadband oscillation tracing method.

[0109] The aforementioned program can run on a processor or be stored in memory (or a computer-readable medium). Computer-readable media includes both permanent and non-permanent, removable and non-removable media, and information storage can be achieved by any method or technology. Information can be computer-readable instructions, data structures, program modules, or other data. Examples of computer storage media include, but are not limited to, phase-change memory (PRAM), static random-access memory (SRAM), dynamic random-access memory (DRAM), other types of random-access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, CD-ROM, digital versatile optical disc (DVD) or other optical storage, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other non-transfer medium that can be used to store information accessible by a computing device.

[0110] These computer programs may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes can be implemented by different modules for different steps.

[0111] This embodiment provides such a device or system. The system, referred to as a measurement data-driven power system broadband oscillation tracing system, includes:

[0112] The data acquisition and preprocessing module is used to acquire instantaneous measurement data of port voltage and current of multiple power generation units or grid-connected nodes, and to preprocess the data.

[0113] The modal recognition and extraction module is used to perform frequency domain analysis on the preprocessed data to identify the target broadband oscillation frequency, and extract the voltage oscillation mode component and the current oscillation mode component at the target broadband oscillation frequency;

[0114] The modal power calculation module is used to calculate the modal power of the target broadband oscillation mode based on the voltage oscillation mode component and the current oscillation mode component;

[0115] The oscillation source location module is used to analyze the sign of the modal power and its characteristics of changing over time, and to identify the power generation unit or grid-connected node that continuously injects oscillation energy into the system as a broadband oscillation source based on the analysis results.

[0116] As one implementation method in this embodiment, the data acquisition and preprocessing module includes:

[0117] The data filtering unit is used to filter and denoise the instantaneous measurement data of the port voltage and current to eliminate the influence of noise and non-oscillating components.

[0118] As one implementation method in this embodiment, the modality recognition and extraction module includes:

[0119] The frequency domain analysis unit is used to perform frequency domain analysis on the data using fast Fourier transform or short-time Fourier transform to identify the target broadband oscillation frequency.

[0120] The mode reconstruction unit is used to perform frequency selection processing near the target broadband oscillation frequency in the frequency domain, and to reconstruct the voltage oscillation mode component and the current oscillation mode component through inverse Fourier transform.

[0121] As one implementation method in this embodiment, the modal power calculation module includes:

[0122] The power term calculation unit is used to calculate a power term containing alternating and non-alternating components based on the voltage oscillation mode components and the current oscillation mode components.

[0123] The component extraction unit is used to perform low-pass filtering or time averaging on the power term to extract the non-alternating power component as the modal power.

[0124] As one implementation method in this embodiment, the oscillation source localization module includes:

[0125] The flow direction determination unit is used to determine the direction of oscillation energy flow based on the sign of the modal power, under the condition that the direction of the current flowing into the port is positive.

[0126] The behavior determination unit is used to perform consistency statistics on the modal power symbols within the analysis period. When the modal power maintains the same symbol within a preset time window, it is determined that the corresponding port has a continuous oscillating energy injection or absorption behavior.

[0127] As one implementation method in this embodiment, the component extraction unit specifically includes:

[0128] A moving average calculation unit is used to calculate the modal power by moving average, wherein the window length of the moving average corresponds to the number of sampling points of one or more oscillation cycles.

[0129] The system or apparatus is used to implement the functions of the methods in the above embodiments. Each module in the system or apparatus corresponds to each step in the method, as has been described in the method and will not be repeated here.

[0130] The above implementation method solves the problem of power system broadband oscillation source tracing driven by measurement data in related technologies, thereby ensuring that the problems existing in the prior art are resolved.

[0131] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A measurement data-driven method for tracing the source of broadband oscillations in power systems, characterized in that, Includes the following steps: Acquire instantaneous measurement data of port voltage and current of multiple power generation units or grid-connected nodes in the power system, and preprocess the data; Frequency domain analysis is performed on the preprocessed data to identify the target broadband oscillation frequency present in the system; At the target broadband oscillation frequency, voltage oscillation mode components and current oscillation mode components are extracted from the data; Based on the voltage oscillation mode components and current oscillation mode components, the modal power under the target broadband oscillation mode is calculated, and the modal power characterizes the energy exchange characteristics between ports. Analyze the sign of the modal power and its characteristics as a function of time; Based on the analysis results, power generation units or grid-connected nodes that continuously inject oscillating energy into the system over a period of time are identified as broadband oscillation sources.

2. The method according to claim 1, characterized in that, The process of preprocessing the data includes: The instantaneous measurement data of the port voltage and current are filtered and denoised to eliminate the influence of noise and non-oscillatory components.

3. The method according to claim 1, characterized in that, The process of extracting voltage oscillation mode components and current oscillation mode components includes: The data is analyzed in the frequency domain using fast Fourier transform or short-time Fourier transform to identify the target broadband oscillation frequency; Frequency selection is performed near the target broadband oscillation frequency in the frequency domain, and the voltage oscillation mode component and current oscillation mode component are reconstructed by inverse Fourier transform.

4. The method according to claim 1, characterized in that, The process of calculating the modal power of the target broadband oscillation mode includes: Based on the voltage oscillation mode components and current oscillation mode components, a power term containing alternating and non-alternating components is calculated. The power term is subjected to low-pass filtering or time averaging to extract the non-alternating power component, which is then used as the modal power.

5. The method according to claim 1, characterized in that, The process of analyzing the sign of the modal power and its time-varying characteristics includes: Under the condition that the direction of the current flowing into the port is positive, the direction of the oscillation energy flow is determined according to the sign of the modal power; The modal power symbols within the analysis period are statistically analyzed for consistency. When the modal power remains the same symbol within a preset time window, it is determined that the corresponding port has a continuous oscillating energy injection or absorption behavior.

6. The method according to claim 5, characterized in that, Modal power is calculated using a moving average, where the window length of the moving average corresponds to the number of sampling points for one or more oscillation periods.

7. A measurement data-driven broadband oscillation tracing system for power systems, characterized in that, The system for implementing the method of any one of claims 1-6 comprises: The data acquisition and preprocessing module is used to acquire instantaneous measurement data of port voltage and current of multiple power generation units or grid-connected nodes, and to preprocess the data. The modal recognition and extraction module is used to perform frequency domain analysis on the preprocessed data to identify the target broadband oscillation frequency, and extract the voltage oscillation mode component and the current oscillation mode component at the target broadband oscillation frequency; The modal power calculation module is used to calculate the modal power of the target broadband oscillation mode based on the voltage oscillation mode component and the current oscillation mode component; The oscillation source location module is used to analyze the sign of the modal power and its characteristics of changing over time, and to identify the power generation unit or grid-connected node that continuously injects oscillation energy into the system as a broadband oscillation source based on the analysis results.

8. A computer terminal device, characterized in that, include: One or more processors; A memory, coupled to the processor, for storing one or more programs; When the one or more programs are executed by the one or more processors, the one or more processors perform the steps of the method as described in any one of claims 1-6.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements the steps of the method as described in any one of claims 1-6.

10. A computer program product, comprising a computer program, characterized in that, When the computer program is executed by a processor, it implements the steps of the method according to any one of claims 1-6.

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