Method and apparatus for detecting power unit oscillations

Abstract

The application provides a power unit oscillation detection method and device, and relates to the technical field of power equipment operation and maintenance. The method comprises the following steps: a first disturbance signal is applied, and a first power parameter is determined; a second disturbance signal is applied, and a second power parameter is determined; wherein, the positive sequence disturbance frequency and the negative sequence disturbance frequency of the first disturbance signal are both target frequencies, and the positive sequence disturbance frequency and the negative sequence disturbance frequency of the second disturbance signal are both complementary frequencies; based on the first power parameter, a first response component and a first coupling response component are obtained, and based on the second power parameter, a second response component and a second coupling response component are obtained; based on the first response component, the first coupling response component, the second response component and the second coupling response component, impedance information is obtained, and whether there is an oscillation risk is judged based on the impedance information; if yes, an alarm is given. The application can improve the speed of power unit oscillation detection, thereby improving the efficiency of power unit oscillation detection.

Description

Technical Field

[0001] This invention relates to the field of power equipment operation and maintenance technology, and in particular to a method and device for detecting oscillations in power generating units. Background Technology

[0002] To ensure the safe and stable operation of new energy power units after grid connection, it is usually necessary to detect the oscillation risk of the power units to confirm whether there are any faults. Currently, the main method for this detection is the impedance method, which involves determining the relevant impedance information of the power unit (such as the impedance matrix) and judging whether there is an oscillation risk based on the relevant impedance information.

[0003] Due to the large number of new energy generator models and their rapid iteration, coupled with the complexity of the unit control system, frequency coupling occurs between the resulting impedance information. Specifically, frequency coupling typically exists at frequencies ranging from a few hertz to several hundred hertz, i.e., when the injection frequency is f... p A positive-sequence voltage disturbance will generate a frequency of f p The positive sequence current response and frequency are (f p The negative-sequence current response (-2f1) has two components (f1 being the fundamental frequency), exhibiting off-diagonal coupling terms. To obtain the four elements of two-dimensional frequency-coupled impedance information, current detection methods often require injecting two sets of linearly uncorrelated positive and negative-sequence perturbation signals (e.g., to extract the required input components, two sets of perturbation signals need to be injected for the current frequency and the complementary frequency), followed by further calculations using algebraic equations. The long perturbation signal injection time results in slow impedance information determination, thus slowing down the overall power unit oscillation detection speed and making it unsuitable for time-sensitive and demanding scenarios in large-scale renewable energy grid integration.

[0004] In summary, the existing technology suffers from the problem of slow speed in detecting power unit oscillations, which is not conducive to improving the efficiency of power unit oscillation detection. Summary of the Invention

[0005] One object of the present invention is to provide a method for detecting power unit oscillations, thereby solving the problem that the detection speed of power unit oscillations in the prior art is slow, which is detrimental to improving the efficiency of power unit oscillation detection. Another object of the present invention is to provide a device for detecting power unit oscillations. A further object of the present invention is to provide a computer device. A still other object of the present invention is to provide a readable medium.

[0006] To achieve the above objectives, one aspect of the present invention discloses a method for detecting oscillations in a power unit, the method comprising:

[0007] A first disturbance signal is applied to a power generating unit to determine a first power parameter of the power generating unit corresponding to the first disturbance signal; a second disturbance signal is applied to the power generating unit to determine a second power parameter of the power generating unit corresponding to the second disturbance signal; wherein, the positive-sequence disturbance frequency and the negative-sequence disturbance frequency of the first disturbance signal are both target frequencies, and the positive-sequence disturbance frequency and the negative-sequence disturbance frequency of the second disturbance signal are both complementary frequencies of the target frequencies;

[0008] Based on the first power parameters, the corresponding first response component and first coupled response component are obtained, and based on the second power parameters, the corresponding second response component and second coupled response component are obtained.

[0009] Based on the first response component, the first coupled response component, the second response component, and the second coupled response component, the impedance information of the power unit corresponding to the target frequency is obtained, and based on the impedance information, it is determined whether the power unit has an oscillation risk. If so, an alarm is issued.

[0010] Optionally, it may further include:

[0011] Determine the frequency threshold based on the preset base frequency;

[0012] Determine whether the target frequency is less than or equal to the frequency threshold. If yes, subtract the target frequency from the frequency threshold to obtain the complementary frequency; otherwise, subtract the frequency threshold from the target frequency to obtain the complementary frequency.

[0013] Optionally, applying the first disturbance signal to the power unit includes:

[0014] The disturbance amplitude is determined based on the steady-state voltage amplitude of the power unit;

[0015] Based on the disturbance amplitude, a first positive-sequence voltage disturbance component and a first negative-sequence voltage disturbance component are determined, wherein the positive-sequence disturbance frequency of the first positive-sequence voltage disturbance component and the negative-sequence disturbance frequency of the first negative-sequence voltage disturbance component are both target frequencies, and the first disturbance signal includes the first positive-sequence voltage disturbance component and the first negative-sequence voltage disturbance component.

[0016] The first positive-sequence voltage disturbance component and the first negative-sequence voltage disturbance component are applied to the power unit.

[0017] Optionally, applying the second disturbance signal to the power unit includes:

[0018] The disturbance amplitude is determined based on the steady-state voltage amplitude of the power unit;

[0019] Based on the disturbance amplitude, a second positive-sequence voltage disturbance component and a second negative-sequence voltage disturbance component are determined, wherein the positive-sequence disturbance frequency of the second positive-sequence voltage disturbance component and the negative-sequence disturbance frequency of the second negative-sequence voltage disturbance component are complementary frequencies of the target frequency, and the second disturbance signal includes the second positive-sequence voltage disturbance component and the second negative-sequence voltage disturbance component.

[0020] The second positive-sequence voltage disturbance component and the second negative-sequence voltage disturbance component are applied to the power unit.

[0021] Optionally, obtaining the corresponding first response component and first coupled response component based on the first power parameter includes:

[0022] Based on the first power parameters, determine the first terminal voltage and the first terminal current after applying the first disturbance signal to the power unit;

[0023] Based on the first terminal voltage, the first terminal current, and a preset decomposition algorithm, the first response component and the first coupled response component are obtained.

[0024] Optionally, obtaining the corresponding second response component and second coupled response component based on the second electrical parameter includes:

[0025] Based on the second power parameters, determine the second terminal voltage and the second terminal current after applying the second disturbance signal to the power unit;

[0026] Based on the second terminal voltage, the second terminal current, and a preset decomposition algorithm, the second response component and the second coupled response component are obtained.

[0027] Optionally, obtaining the impedance information of the power unit corresponding to the target frequency based on the first response component, the first coupled response component, the second response component, and the second coupled response component includes:

[0028] Based on the first response component, a first voltage response component and a first current response component corresponding to the target frequency are obtained, and based on the first coupling response component, a first coupled voltage response component and a first coupled current response component corresponding to the complementary frequency are obtained.

[0029] Based on the second response component, a second voltage response component and a second current response component corresponding to the complementary frequency are obtained, and based on the second coupling response component, a second coupled voltage response component and a second coupled current response component corresponding to the target frequency are obtained.

[0030] Based on the first voltage response component, the first current response component, the first coupled voltage response component, the first coupled current response component, the second voltage response component, the second current response component, the second coupled voltage response component, and the second coupled current response component, the corresponding impedance information is obtained.

[0031] Optionally, obtaining a first voltage response component and a first current response component corresponding to the target frequency based on the first response component, and obtaining a first coupled voltage response component and a first coupled current response component corresponding to the complementary frequency based on the first coupled response component, includes:

[0032] Determine whether the target frequency is less than or equal to a preset frequency threshold;

[0033] If so, based on the first response component, a first positive-sequence voltage response component and a first positive-sequence current response component corresponding to the target frequency are obtained, and based on the first coupling response component, a first positive-sequence coupled voltage response component and a first positive-sequence coupled current response component corresponding to the complementary frequency are obtained; the first positive-sequence voltage response component is used as the first voltage response component, the first positive-sequence current response component is used as the first current response component, the first positive-sequence coupled voltage response component is used as the first coupled voltage response component, and the first positive-sequence coupled current response component is used as the first coupled current response component;

[0034] If not, based on the first response component, a first positive-sequence voltage response component and a first positive-sequence current response component corresponding to the target frequency are obtained, and based on the first coupling response component, a first negative-sequence coupling voltage response component and a first negative-sequence coupling current response component corresponding to the complementary frequency are obtained; the first positive-sequence voltage response component is used as the first voltage response component, the first positive-sequence current response component is used as the first current response component, the first negative-sequence coupling voltage response component is used as the first coupling voltage response component, and the first negative-sequence coupling current response component is used as the first coupling current response component.

[0035] Optionally, obtaining a second voltage response component and a second current response component corresponding to the complementary frequency based on the second response component, and obtaining a second coupled voltage response component and a second coupled current response component corresponding to the target frequency based on the second coupled response component, includes:

[0036] Determine whether the target frequency is less than or equal to a preset frequency threshold;

[0037] If so, based on the second response component, a second positive-sequence voltage response component and a second positive-sequence current response component corresponding to the complementary frequency are obtained, and based on the second coupling response component, a second positive-sequence coupled voltage response component and a second positive-sequence coupled current response component corresponding to the target frequency are obtained; the second positive-sequence voltage response component is used as the second voltage response component, the second positive-sequence current response component is used as the second current response component, the second positive-sequence coupled voltage response component is used as the second coupled voltage response component, and the second positive-sequence coupled current response component is used as the second coupled current response component;

[0038] If not, based on the second response component, a second negative-sequence voltage response component and a second negative-sequence current response component corresponding to the complementary frequency are obtained, and based on the second coupling response component, a second positive-sequence coupling voltage response component and a second positive-sequence coupling current response component corresponding to the target frequency are obtained; the second negative-sequence voltage response component is used as the second voltage response component, the second negative-sequence current response component is used as the second current response component, the second positive-sequence coupling voltage response component is used as the second coupling voltage response component, and the second positive-sequence coupling current response component is used as the second coupling current response component.

[0039] Optionally, obtaining the corresponding impedance information based on the first voltage response component, the first current response component, the first coupled voltage response component, the first coupled current response component, the second voltage response component, the second current response component, the second coupled voltage response component, and the second coupled current response component includes:

[0040] Based on the first voltage response component, the second coupled voltage response component, the first coupled voltage response component, and the second voltage response component, the calculated voltage parameters are obtained.

[0041] Based on the first current response component, the second coupled current response component, the first coupled current response component, and the second current response component, the calculated current parameters are obtained.

[0042] The impedance information is obtained based on the calculated voltage and current parameters.

[0043] To achieve the above objectives, another aspect of the present invention discloses a power unit oscillation detection device, the device comprising:

[0044] A disturbance injection module is used to apply a first disturbance signal to a power unit and determine a first power parameter of the power unit corresponding to the first disturbance signal; apply a second disturbance signal to the power unit and determine a second power parameter of the power unit corresponding to the second disturbance signal; wherein the positive-sequence disturbance frequency and the negative-sequence disturbance frequency of the first disturbance signal are both target frequencies, and the positive-sequence disturbance frequency and the negative-sequence disturbance frequency of the second disturbance signal are both complementary frequencies of the target frequencies;

[0045] The parameter parsing module is used to obtain the corresponding first response component and first coupled response component based on the first power parameter, and to obtain the corresponding second response component and second coupled response component based on the second power parameter;

[0046] The risk detection module is used to obtain the impedance information of the power unit corresponding to the target frequency based on the first response component, the first coupled response component, the second response component, and the second coupled response component, and to determine whether the power unit has an oscillation risk based on the impedance information. If so, an alarm is issued.

[0047] The present invention also discloses a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the method described above.

[0048] The present invention also discloses a computer-readable medium having a computer program stored thereon, which, when executed by a processor, implements the method described above.

[0049] The present invention provides a method and apparatus for detecting power unit oscillations. By applying a first disturbance signal to the power unit, a first power parameter corresponding to the first disturbance signal is determined; by applying a second disturbance signal to the power unit, a second power parameter corresponding to the second disturbance signal is determined. The positive-sequence and negative-sequence disturbance frequencies of the first disturbance signal are both target frequencies, and the positive-sequence and negative-sequence disturbance frequencies of the second disturbance signal are both complementary frequencies of the target frequencies. This fully considers the linear uncorrelated and non-coupling situation of positive-sequence and negative-sequence injected disturbance components of the same frequency. Therefore, for the target frequency and complementary frequency, injecting disturbance signals of the same frequency in both positive and negative sequences allows for the smooth extraction of relevant parameters for calculation and processing to determine impedance information, without needing to inject two sets of disturbance signals for each target frequency and complementary frequency (here, only one set is injected for each). This significantly reduces the injection time of the disturbance signals, increases the speed of determining impedance information, and thus significantly improves the overall speed of power unit oscillation detection.

[0050] By obtaining the corresponding first response component and first coupled response component based on the first power parameter, and obtaining the corresponding second response component and second coupled response component based on the second power parameter, the analysis can be refined, and the specific components for subsequent calculation and processing can be obtained quickly and accurately. This improves the speed and accuracy of determining impedance information, thereby improving the speed and accuracy of overall power unit oscillation detection.

[0051] By obtaining the impedance information of the power unit corresponding to the target frequency based on the first response component, the first coupled response component, the second response component, and the second coupled response component, and judging whether the power unit has an oscillation risk based on the impedance information, if so, an alarm is issued. The impedance information can be obtained quickly based on relevant principles and unit operating characteristics, and detection can be carried out based on this information, thereby improving the speed of overall power unit oscillation detection.

[0052] In summary, the power unit oscillation detection method and apparatus provided by the present invention can improve the speed of power unit oscillation detection, thereby improving the efficiency of power unit oscillation detection. Attached Figure Description

[0053] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0054] Figure 1 A flowchart illustrating a method for detecting oscillations in a power unit according to an embodiment of the present invention is shown;

[0055] Figure 2 A schematic diagram illustrating an optional step in determining complementary frequencies according to an embodiment of the present invention is shown;

[0056] Figure 3 A schematic diagram illustrating an optional step in obtaining a first response component and a first coupled response component according to an embodiment of the present invention is shown.

[0057] Figure 4 A schematic diagram illustrating an optional step in obtaining a second response component and a second coupled response component according to an embodiment of the present invention is shown.

[0058] Figure 5 A schematic diagram illustrating an optional step in obtaining impedance information according to an embodiment of the present invention is shown;

[0059] Figure 6 A schematic diagram of a power unit oscillation detection device according to an embodiment of the present invention is shown;

[0060] Figure 7 A schematic diagram of a computer device suitable for implementing embodiments of the present invention is shown. Detailed Implementation

[0061] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0062] The terms "first," "second," etc., used in this document do not specifically refer to any order or sequence, nor are they intended to limit the invention; they are merely used to distinguish elements or operations described using the same technical terms.

[0063] The terms “include,” “including,” “have,” “contain,” etc., used in this article are all open-ended terms, meaning that they include but are not limited to.

[0064] The term "and / or" as used herein includes any or all of the things mentioned.

[0065] It should be noted that the acquisition, storage, use, and processing of data in the technical solution of this invention all comply with the relevant provisions of laws and regulations.

[0066] It should be noted that the power unit vibration detection method and device disclosed in this application can be used in the field of power equipment operation and maintenance technology, or in any field other than the field of power equipment operation and maintenance technology. The application field of the power unit vibration detection method and device disclosed in this application is not limited.

[0067] This invention discloses a method for detecting oscillations in power generating units, such as... Figure 1 As shown, the method specifically includes the following steps:

[0068] S101: Apply a first disturbance signal to the power unit and determine a first power parameter of the power unit corresponding to the first disturbance signal; apply a second disturbance signal to the power unit and determine a second power parameter of the power unit corresponding to the second disturbance signal; wherein, the positive-sequence disturbance frequency and the negative-sequence disturbance frequency of the first disturbance signal are both target frequencies, and the positive-sequence disturbance frequency and the negative-sequence disturbance frequency of the second disturbance signal are both complementary frequencies of the target frequencies.

[0069] S102: Based on the first power parameters, obtain the corresponding first response component and first coupled response component, and based on the second power parameters, obtain the corresponding second response component and second coupled response component.

[0070] S103: Based on the first response component, the first coupled response component, the second response component, and the second coupled response component, obtain the impedance information of the power unit corresponding to the target frequency, and determine whether the power unit has an oscillation risk based on the impedance information. If so, issue an alarm.

[0071] For example, the power unit can be, but is not limited to, a new energy power unit.

[0072] For example, the disturbance signal in this embodiment of the invention can be, but is not limited to, a voltage disturbance signal. It should be noted that the specific nature of the disturbance signal can be determined by those skilled in the art based on actual circumstances; the above description is merely illustrative and does not constitute a limitation.

[0073] For example, the impedance information may specifically be, but is not limited to, an impedance matrix.

[0074] For example, the first disturbance signal corresponds to a first electrical parameter, which in turn corresponds to a first response component and a first coupled response component; the second disturbance signal corresponds to a second electrical parameter, which in turn corresponds to a second response component and a second coupled response component; and one target frequency corresponds to one impedance information. It should be noted that the specific details of these correspondences can be determined by those skilled in the art based on actual circumstances. The above description is merely illustrative and does not constitute a limitation.

[0075] For example, determining whether the power unit has an oscillation risk based on the impedance information can be, but is not limited to, using impedance information corresponding to multiple target frequencies within a preset frequency range, relevant system impedance information of the overall system (optional), and component impedance information of corresponding components (optional) as inputs, and performing a solution process using the generalized Nyquist method (based on the generalized Nyquist stability criterion) to determine whether the power unit has an oscillation risk. If so, an alarm is issued. The preset frequency range can be, but is not limited to, a range between 1Hz and 2500Hz. For example, the preset frequency range can be [1Hz, 2000Hz]. The selection of target frequencies can be, but is not limited to, sampling from the preset frequency range according to preset frequency intervals. For example, when the frequency interval is 1Hz and the frequency range is [1Hz, 2000Hz], the sampled target frequencies include, but are not limited to, 1Hz, 2Hz, 3Hz, 4Hz...2000Hz. Preferably, when the frequency is greater than a preset frequency threshold, different frequency intervals can be used for decimation. For example, if the frequency threshold is 100Hz, decimation after 100Hz can be performed at 10Hz intervals (or it can continue to be 1Hz). After determining the target frequency, a corresponding disturbance signal can be injected for each target frequency at the beginning. It should be noted that the specific implementation method, relevant frequency range, and target frequency decimation method for determining whether the power unit has an oscillation risk based on the impedance information can be determined by those skilled in the art according to the actual situation. The above description is only an example and does not constitute a limitation.

[0076] For example, when an oscillation risk is detected, it indicates that the power unit has a fault and is prone to oscillation problems after being put into operation and connected to the grid.

[0077] For example, determining the first power parameter of the power unit corresponding to the first disturbance signal can be, but is not limited to, directly acquiring the corresponding first power parameter of the power unit after applying the first disturbance signal on the corresponding hardware-in-the-loop test platform. Determining the second power parameter of the power unit corresponding to the second disturbance signal can be, but is not limited to, directly acquiring the corresponding second power parameter of the power unit after applying the second disturbance signal on the corresponding hardware-in-the-loop test platform. It should be noted that the specific method for determining the first and second power parameters can be determined by those skilled in the art based on the actual situation; the above description is merely an example and does not constitute a limitation. The first power parameter corresponds to the first disturbance signal with a target frequency, and the second power parameter corresponds to the second disturbance signal with a complementary frequency.

[0078] Preferably, for each selected target frequency, a disturbance signal can be injected once at the beginning. The unit oscillation detection method of this embodiment only requires injecting a disturbance once for each selected frequency. Based on the complex conjugate relationship between positive and negative sequence components and the frequency coupling component relationship, two linearly uncorrelated sets of disturbance components (first response component and first coupled response component, second response component and second coupled response component) are extracted through subsequent data reconstruction. This can save nearly 50% of the disturbance measurement time and effectively improve the efficiency of determining the unit impedance.

[0079] The present invention provides a method and apparatus for detecting power unit oscillations. By applying a first disturbance signal to the power unit, a first power parameter corresponding to the first disturbance signal is determined; by applying a second disturbance signal to the power unit, a second power parameter corresponding to the second disturbance signal is determined. The positive-sequence and negative-sequence disturbance frequencies of the first disturbance signal are both target frequencies, and the positive-sequence and negative-sequence disturbance frequencies of the second disturbance signal are both complementary frequencies of the target frequencies. This fully considers the linear uncorrelated and non-coupling situation of positive-sequence and negative-sequence injected disturbance components of the same frequency. Therefore, for the target frequency and complementary frequency, injecting disturbance signals of the same frequency in both positive and negative sequences allows for the smooth extraction of relevant parameters for calculation and processing to determine impedance information, without needing to inject two sets of disturbance signals for each target frequency and complementary frequency (here, only one set is injected for each). This significantly reduces the injection time of the disturbance signals, increases the speed of determining impedance information, and thus significantly improves the overall speed of power unit oscillation detection.

[0080] By obtaining the corresponding first response component and first coupled response component based on the first power parameter, and obtaining the corresponding second response component and second coupled response component based on the second power parameter, the analysis can be refined, and the specific components for subsequent calculation and processing can be obtained quickly and accurately. This improves the speed and accuracy of determining impedance information, thereby improving the speed and accuracy of overall power unit oscillation detection.

[0081] By obtaining the impedance information of the power unit corresponding to the target frequency based on the first response component, the first coupled response component, the second response component, and the second coupled response component, and judging whether the power unit has an oscillation risk based on the impedance information, if so, an alarm is issued. The impedance information can be obtained quickly based on relevant principles and unit operating characteristics, and detection can be carried out based on this information, thereby improving the speed of overall power unit oscillation detection.

[0082] In summary, the power unit oscillation detection method and apparatus provided by the present invention can improve the speed of power unit oscillation detection, thereby improving the efficiency of power unit oscillation detection.

[0083] In one alternative implementation, such as Figure 2 As shown, it further includes the following steps:

[0084] S201: Determine the frequency threshold based on the preset base frequency.

[0085] S202: Determine whether the target frequency is less than or equal to the frequency threshold. If yes, subtract the target frequency from the frequency threshold to obtain the complementary frequency; if no, subtract the frequency threshold from the target frequency to obtain the complementary frequency.

[0086] For example, the base frequency can be, but is not limited to, 50Hz.

[0087] For example, step S201 can be, but is not limited to, multiplying the base frequency by 2 to obtain the frequency threshold. For instance, when the base frequency is 50Hz, the frequency threshold is determined to be 100Hz. Within the frequency range, the sub-ranges less than or equal to the frequency threshold are considered low-frequency bands, and the sub-ranges greater than the frequency threshold are considered high-frequency bands. It should be noted that the specific implementation of step S201 can be determined by those skilled in the art based on actual circumstances. The above description is merely an example and does not constitute a limitation.

[0088] For example, a target frequency corresponds to a complementary frequency.

[0089] Through the above steps, the frequency threshold can be made to correspond with the fundamental frequency of the power unit, and the high-frequency and low-frequency bands divided based on the frequency threshold can be more consistent with the actual situation of the unit. This makes the accuracy of different calculations performed with the frequency threshold as the boundary higher, thereby improving the accuracy of determining impedance information and thus improving the accuracy of unit oscillation detection.

[0090] In an optional implementation, applying the first disturbance signal to the power unit includes:

[0091] The disturbance amplitude is determined based on the steady-state voltage amplitude of the power unit;

[0092] Based on the disturbance amplitude, a first positive-sequence voltage disturbance component and a first negative-sequence voltage disturbance component are determined, wherein the positive-sequence disturbance frequency of the first positive-sequence voltage disturbance component and the negative-sequence disturbance frequency of the first negative-sequence voltage disturbance component are both target frequencies, and the first disturbance signal includes the first positive-sequence voltage disturbance component and the first negative-sequence voltage disturbance component.

[0093] The first positive-sequence voltage disturbance component and the first negative-sequence voltage disturbance component are applied to the power unit.

[0094] For example, determining the disturbance amplitude based on the steady-state voltage amplitude of the power unit can be, but is not limited to, multiplying the known steady-state voltage amplitude by a preset disturbance coefficient. The disturbance coefficient can be, but is not limited to, a coefficient ranging from [2%, 5%], and needs to be determined based on relevant experience and actual operating conditions. It should be noted that the specific implementation method for determining the disturbance amplitude based on the steady-state voltage amplitude of the power unit can be determined by those skilled in the art based on actual circumstances; the above description is merely an example and does not constitute a limitation. If the disturbance amplitude has already been determined previously, it does not need to be determined again here.

[0095] For example, determining the first positive-sequence voltage disturbance component and the first negative-sequence voltage disturbance component based on the disturbance amplitude can be, but is not limited to, being directly set and operated on a relevant hardware-in-the-loop test platform based on known disturbance amplitude and frequency. Furthermore, applying the first positive-sequence voltage disturbance component and the first negative-sequence voltage disturbance component to the power unit can also be implemented through a hardware-in-the-loop test platform. It should be noted that the specific implementation methods for determining the first positive-sequence voltage disturbance component and the first negative-sequence voltage disturbance component based on the disturbance amplitude, and for applying the first positive-sequence voltage disturbance component and the first negative-sequence voltage disturbance component to the power unit, can be determined by those skilled in the art based on actual circumstances. The above description is merely an example and does not constitute a limitation.

[0096] Through the above steps, it is possible to apply corresponding disturbance signals with consistent positive and negative sequence frequencies in a more refined, accurate and rapid manner, which is more conducive to the smooth progress of subsequent steps, improves the speed and accuracy of overall impedance information determination, and thus improves the speed and accuracy of overall unit oscillation detection.

[0097] In an optional implementation, applying the second disturbance signal to the power unit includes:

[0098] The disturbance amplitude is determined based on the steady-state voltage amplitude of the power unit;

[0099] Based on the disturbance amplitude, a second positive-sequence voltage disturbance component and a second negative-sequence voltage disturbance component are determined, wherein the positive-sequence disturbance frequency of the second positive-sequence voltage disturbance component and the negative-sequence disturbance frequency of the second negative-sequence voltage disturbance component are complementary frequencies of the target frequency, and the second disturbance signal includes the second positive-sequence voltage disturbance component and the second negative-sequence voltage disturbance component.

[0100] The second positive-sequence voltage disturbance component and the second negative-sequence voltage disturbance component are applied to the power unit.

[0101] For example, determining the disturbance amplitude based on the steady-state voltage amplitude of the power unit can be, but is not limited to, multiplying the known steady-state voltage amplitude by a preset disturbance coefficient. The disturbance coefficient can be, but is not limited to, a coefficient ranging from [2%, 5%], and needs to be determined based on relevant experience and actual operating conditions. It should be noted that the specific implementation method for determining the disturbance amplitude based on the steady-state voltage amplitude of the power unit can be determined by those skilled in the art based on actual circumstances; the above description is merely an example and does not constitute a limitation. If the disturbance amplitude has already been determined previously, it does not need to be determined again here.

[0102] For example, determining the second positive-sequence voltage disturbance component and the second negative-sequence voltage disturbance component based on the disturbance amplitude can be, but is not limited to, being directly set and operated on a relevant hardware-in-the-loop test platform based on known disturbance amplitude and frequency. Furthermore, applying the second positive-sequence voltage disturbance component and the second negative-sequence voltage disturbance component to the power unit can also be implemented through a hardware-in-the-loop test platform. It should be noted that the specific implementation method for determining the second positive-sequence voltage disturbance component and the second negative-sequence voltage disturbance component based on the disturbance amplitude can be determined by those skilled in the art according to the actual situation; the above description is merely an example and does not constitute a limitation.

[0103] Through the above steps, it is possible to apply corresponding disturbance signals with consistent positive and negative sequence frequencies in a more refined, accurate and rapid manner, which is more conducive to the smooth progress of subsequent steps, improves the speed and accuracy of overall impedance information determination, and thus improves the speed and accuracy of overall unit oscillation detection.

[0104] It should be noted that there is no specific order in which the first and second disturbance signals are applied; that is, the application of the first and second disturbance signals is independent. However, when applying the first or second disturbance signal, it is necessary to ensure that the current unit is not affected by other disturbance signals.

[0105] In this embodiment of the invention, when applying the first disturbance signal or the second disturbance signal, the voltage disturbance signal may be superimposed in series at the generator terminal of the power unit, but is not limited to being superimposed on the three phases at the generator terminal respectively, but is not limited to being superimposed on the disturbance signals corresponding to different phase lines respectively.

[0106] In principle, a three-phase disturbance signal can be expressed as, but is not limited to, the following formula:

[0107]

[0108]

[0109]

[0110] Where, Δu a For phase A disturbance signal component (voltage), Δu b For the B-phase disturbance signal component (voltage), Δu c For the C-phase disturbance signal component (voltage), U scan f represents the disturbance amplitude (specifically, the disturbance voltage amplitude). p注入 For the positive-sequence perturbation frequency (target frequency or complementary frequency), f n注入 For the negative sequence perturbation frequency (target frequency or complementary frequency), f p注入 equal to f n注入 t is a time parameter. This represents the positive-sequence disturbance component (positive-sequence voltage disturbance component) of the A-phase disturbance signal component. This represents the negative-sequence disturbance component (negative-sequence voltage disturbance component) of the A-phase disturbance signal component. This represents the positive-sequence disturbance component (positive-sequence voltage disturbance component) of the B-phase disturbance signal component. This represents the negative-sequence disturbance component (negative-sequence voltage disturbance component) of the B-phase disturbance signal component. This represents the positive-sequence disturbance component (positive-sequence voltage disturbance component) of the C-phase disturbance signal component. This represents the negative-sequence disturbance component (negative-sequence voltage disturbance component) of the C-phase disturbance signal component.

[0111] After applying a disturbance signal, the terminal voltage can be theoretically expressed as:

[0112] u a =u a0 +Δu a

[0113] u b =u b0 +Δu b

[0114] u c =u c0 +Δu c

[0115] Among them, u a Let u be the voltage at camera A. b For camera B terminal voltage, u c For the voltage at camera terminal C, u a0 The steady-state voltage of phase A, u b0 For phase B steady-state voltage, u c0 This is the steady-state voltage of phase C.

[0116] Correspondingly, after applying a disturbance signal, the terminal current can be expressed in principle as follows:

[0117] i a =i a0 +Δi a

[0118] i b =i b0 +Δi b

[0119] i c =i c0 +Δi c

[0120] Where, Δi a For phase A disturbance signal component (current), Δi b For the B-phase disturbance signal component (current), Δi c For the C-phase disturbance signal component (current), i a Let i be the current at camera A. b For the current at camera B, i c For the current at the camera terminal C, i a0 Let i be the fundamental frequency current of phase A. b0 Let i be the fundamental frequency current of phase B. c0 This is the fundamental frequency current of phase C.

[0121] It should be noted that the positive-sequence and negative-sequence components of the same frequency are linearly uncorrelated and do not have coupling. Simultaneously injecting voltage disturbances of the same frequency and positive-sequence components can effectively save disturbance injection time and improve the efficiency of impedance testing above 100Hz. Thus, after one disturbance injection, the three-phase voltage components (abc) and three-phase current components (abc) of the generator terminal steady-state voltage at each frequency point within the test frequency range can be obtained.

[0122] The processing of disturbance signals is achieved through a pre-built hardware-in-the-loop test platform.

[0123] It should be noted that the application mechanism and principle of the disturbance signal can be determined by those skilled in the art based on the actual situation. The above description is only an example and does not constitute a limitation.

[0124] In one alternative implementation, such as Figure 3 As shown, obtaining the corresponding first response component and first coupled response component based on the first power parameter includes the following steps:

[0125] S301: Based on the first power parameters, determine the first terminal voltage and the first terminal current after applying the first disturbance signal to the power unit.

[0126] S302: Based on the first terminal voltage, the first terminal current and a preset decomposition algorithm, the first response component and the first coupled response component are obtained.

[0127] For example, step S301 may be, but is not limited to, parsing the first power parameters to obtain the first terminal voltage and the first terminal current, which are included in the first power parameters. The first terminal voltage may include, but is not limited to, the voltages of the three phases at the generator terminals, and the first terminal current may include, but is not limited to, the currents of the three phases at the generator terminals. It should be noted that the specific implementation of step S301 can be determined by those skilled in the art based on actual circumstances; the above description is merely an example and does not constitute a limitation.

[0128] For example, step S302 can be performed, but is not limited to, using Fourier decomposition algorithms and positive-negative order decomposition algorithms to decompose the first terminal voltage and the first terminal current to obtain the first response component and the first coupling response component. It should be noted that the specific implementation of step S302 can be determined by those skilled in the art based on actual circumstances; the above description is merely an example and does not constitute a limitation.

[0129] For example, the first response component and the first coupled response component are at the same level, rather than being inclusive. That is, the first response component and the first coupled response component are two different types of disturbance response components.

[0130] Through the above steps, the analysis can be performed quickly, accurately, and in detail to determine the corresponding refined components, thus preparing for the subsequent determination of impedance information. This improves the speed and accuracy of impedance information determination, thereby improving the speed and accuracy of overall unit oscillation detection.

[0131] In one alternative implementation, such as Figure 4 As shown, obtaining the corresponding second response component and second coupled response component based on the second power parameter includes the following steps:

[0132] S401: Based on the second power parameters, determine the second terminal voltage and the second terminal current after applying the second disturbance signal to the power unit.

[0133] S402: Based on the second terminal voltage, the second terminal current and the preset decomposition algorithm, the second response component and the second coupled response component are obtained.

[0134] For example, step S401 may be, but is not limited to, parsing the second power parameters to obtain the second terminal voltage and the second terminal current, which are included in the second power parameters. The second terminal voltage may include, but is not limited to, the voltages of the three phases at the generator terminals, and the second terminal current may include, but is not limited to, the currents of the three phases at the generator terminals. It should be noted that the specific implementation of step S401 can be determined by those skilled in the art based on actual circumstances; the above description is merely an example and does not constitute a limitation.

[0135] For example, step S402 can be performed, but is not limited to, using Fourier decomposition algorithms and positive-negative order decomposition algorithms to decompose the second terminal voltage and the second terminal current to obtain the second response component and the second coupled response component. It should be noted that the specific implementation of step S402 can be determined by those skilled in the art based on actual circumstances; the above description is merely an example and does not constitute a limitation.

[0136] For example, the second response component and the second coupled response component are on the same level, rather than being inclusive. That is, the second response component and the second coupled response component are two perturbation response components of different natures.

[0137] Through the above steps, the analysis can be performed quickly, accurately, and in detail to determine the corresponding refined components, thus preparing for the subsequent determination of impedance information. This improves the speed and accuracy of impedance information determination, thereby improving the speed and accuracy of overall unit oscillation detection.

[0138] In this embodiment of the invention, the fundamental frequency can be assumed to be 50Hz. Therefore, the relationship between the positive and negative sequence components in the extracted response signal satisfies the complementary relationship (negative sequence frequency = positive sequence frequency - 100Hz) and the complex conjugate relationship Z. p (s)=Z n (-s) * Among them, Z p (s) represents the positive sequence impedance, Z n (-s) represents the negative sequence impedance. s = j2Πf, where j represents the imaginary part and f represents the corresponding frequency. Therefore, it can be seen that the positive and negative sequence voltage and current components under the perturbations at the target frequency and complementary frequency can be directly extracted and recombined to obtain two sets of linearly uncorrelated perturbation components, without having to apply two perturbations to both the target frequency and complementary frequency beforehand.

[0139] In one alternative implementation, such as Figure 5 As shown, obtaining the impedance information of the power unit corresponding to the target frequency based on the first response component, the first coupled response component, the second response component, and the second coupled response component includes the following steps:

[0140] S501: Based on the first response component, obtain the first voltage response component and the first current response component corresponding to the target frequency, and based on the first coupling response component, obtain the first coupled voltage response component and the first coupled current response component corresponding to the complementary frequency.

[0141] S502: Based on the second response component, obtain the second voltage response component and the second current response component corresponding to the complementary frequency, and based on the second coupling response component, obtain the second coupling voltage response component and the second coupling current response component corresponding to the target frequency.

[0142] S503: Based on the first voltage response component, the first current response component, the first coupled voltage response component, the first coupled current response component, the second voltage response component, the second current response component, the second coupled voltage response component, and the second coupled current response component, the corresponding impedance information is obtained.

[0143] By taking into full account the operating characteristics and frequency coupling laws of the new energy unit, we can perform detailed analysis and accurately and quickly determine the different detailed components required to obtain impedance information at different frequencies. This can significantly improve the speed and accuracy of impedance information determination, thereby improving the speed and accuracy of overall unit oscillation detection.

[0144] In an optional implementation, obtaining a first voltage response component and a first current response component corresponding to the target frequency based on the first response component, and obtaining a first coupled voltage response component and a first coupled current response component corresponding to the complementary frequency based on the first coupled response component, includes:

[0145] Determine whether the target frequency is less than or equal to a preset frequency threshold;

[0146] If so, based on the first response component, a first positive-sequence voltage response component and a first positive-sequence current response component corresponding to the target frequency are obtained, and based on the first coupling response component, a first positive-sequence coupled voltage response component and a first positive-sequence coupled current response component corresponding to the complementary frequency are obtained; the first positive-sequence voltage response component is used as the first voltage response component, the first positive-sequence current response component is used as the first current response component, the first positive-sequence coupled voltage response component is used as the first coupled voltage response component, and the first positive-sequence coupled current response component is used as the first coupled current response component;

[0147] If not, based on the first response component, a first positive-sequence voltage response component and a first positive-sequence current response component corresponding to the target frequency are obtained, and based on the first coupling response component, a first negative-sequence coupling voltage response component and a first negative-sequence coupling current response component corresponding to the complementary frequency are obtained; the first positive-sequence voltage response component is used as the first voltage response component, the first positive-sequence current response component is used as the first current response component, the first negative-sequence coupling voltage response component is used as the first coupling voltage response component, and the first negative-sequence coupling current response component is used as the first coupling current response component.

[0148] For example, obtaining the first positive-sequence voltage response component and the first positive-sequence current response component corresponding to the target frequency based on the first response component, and obtaining the first positive-sequence coupled voltage response component and the first positive-sequence coupled current response component corresponding to the complementary frequency based on the first coupled response component, can be, but is not limited to, analyzing the first response component to obtain the first positive-sequence voltage response component and the first positive-sequence current response component of the target frequency included in or corresponding to the first response component, and analyzing the first coupled response component to obtain the first positive-sequence coupled voltage response component and the first positive-sequence coupled current response component of the complementary frequency included in or corresponding to the first coupled response component.

[0149] For example, if the impedance information (matrix) to be determined is impedance information with a target frequency of 1Hz (less than the frequency threshold of 100Hz), then for the applied first disturbance signal (in this example, the first disturbance signal with an injected frequency of 1Hz), the corresponding 1Hz positive sequence response voltage component (first positive sequence voltage response component), 99Hz positive sequence voltage response component (first positive sequence coupling voltage response component), 1Hz positive sequence current response component (first positive sequence current response component), and 99Hz positive sequence current response component (first positive sequence coupling current response component) are extracted.

[0150] It should be noted that the specific implementation of obtaining the first positive sequence voltage response component and the first positive sequence current response component corresponding to the target frequency based on the first response component, and obtaining the first positive sequence coupled voltage response component and the first positive sequence coupled current response component corresponding to the complementary frequency based on the first coupled response component, can be determined by those skilled in the art according to the actual situation. The above description is only an example and does not constitute a limitation.

[0151] For example, obtaining a first positive-sequence voltage response component and a first positive-sequence current response component corresponding to the target frequency based on the first response component, and obtaining a first negative-sequence coupled voltage response component and a first negative-sequence coupled current response component corresponding to the complementary frequency based on the first coupled response component, can be, but is not limited to, analyzing the first response component to obtain the first positive-sequence voltage response component and the first positive-sequence current response component of the target frequency included in or corresponding to the first response component, and analyzing the first coupled response component to obtain the first negative-sequence coupled voltage response component and the first negative-sequence coupled current response component of the complementary frequency included in or corresponding to the first coupled response component.

[0152] For example, if the impedance information (matrix) to be determined is impedance information with a target frequency of 101Hz (greater than the frequency threshold of 100Hz), then for the applied first disturbance signal (in this example, the injected first disturbance signal at a frequency of 101Hz), the corresponding 101Hz positive sequence response voltage component (first positive sequence voltage response component), 1Hz negative sequence voltage response component (first negative sequence coupling voltage response component), 101Hz positive sequence current response component (first positive sequence current response component), and 1Hz negative sequence current response component (first negative sequence coupling current response component) are extracted.

[0153] It should be noted that the specific implementation of obtaining the first positive sequence voltage response component and the first positive sequence current response component corresponding to the target frequency based on the first response component, and obtaining the first negative sequence coupled voltage response component and the first negative sequence coupled current response component corresponding to the complementary frequency based on the first coupled response component, can be determined by those skilled in the art according to the actual situation. The above description is only an example and does not constitute a limitation.

[0154] Through the above steps, the operating characteristics and frequency coupling laws of new energy units can be considered in more detail, and more detailed analysis can be performed. For disturbance signals of different frequencies, the corresponding refined components suitable for calculation can be extracted more accurately, thereby further improving the speed and accuracy of determining impedance information, and thus improving the speed and accuracy of overall unit oscillation detection.

[0155] In an optional implementation, obtaining a second voltage response component and a second current response component corresponding to the complementary frequency based on the second response component, and obtaining a second coupled voltage response component and a second coupled current response component corresponding to the target frequency based on the second coupled response component, includes:

[0156] Determine whether the target frequency is less than or equal to a preset frequency threshold;

[0157] If so, based on the second response component, a second positive-sequence voltage response component and a second positive-sequence current response component corresponding to the complementary frequency are obtained, and based on the second coupling response component, a second positive-sequence coupled voltage response component and a second positive-sequence coupled current response component corresponding to the target frequency are obtained; the second positive-sequence voltage response component is used as the second voltage response component, the second positive-sequence current response component is used as the second current response component, the second positive-sequence coupled voltage response component is used as the second coupled voltage response component, and the second positive-sequence coupled current response component is used as the second coupled current response component;

[0158] If not, based on the second response component, a second negative-sequence voltage response component and a second negative-sequence current response component corresponding to the complementary frequency are obtained, and based on the second coupling response component, a second positive-sequence coupling voltage response component and a second positive-sequence coupling current response component corresponding to the target frequency are obtained; the second negative-sequence voltage response component is used as the second voltage response component, the second negative-sequence current response component is used as the second current response component, the second positive-sequence coupling voltage response component is used as the second coupling voltage response component, and the second positive-sequence coupling current response component is used as the second coupling current response component.

[0159] For example, obtaining the second positive-sequence voltage response component and the second positive-sequence current response component corresponding to the complementary frequency based on the second response component, and obtaining the second positive-sequence coupled voltage response component and the second positive-sequence coupled current response component corresponding to the target frequency based on the second coupled response component, can be, but is not limited to, analyzing the second response component to obtain the second positive-sequence voltage response component and the second positive-sequence current response component including or corresponding to the complementary frequency of the second response component, and analyzing the second coupled response component to obtain the second positive-sequence coupled voltage response component and the second positive-sequence coupled current response component including or corresponding to the target frequency of the second coupled response component.

[0160] For example, if the impedance information (matrix) to be determined is impedance information with a target frequency of 1Hz (less than the frequency threshold of 100Hz), then for the applied second disturbance signal (in this example, the injected second disturbance signal with a frequency of 99Hz), the corresponding 99Hz positive sequence response voltage component (second positive sequence voltage response component), 1Hz positive sequence voltage response component (second positive sequence coupling voltage response component), 99Hz positive sequence current response component (second positive sequence current response component), and 1Hz positive sequence current response component (second positive sequence coupling current response component) are extracted.

[0161] It should be noted that the specific implementation of obtaining the second positive sequence voltage response component and the second positive sequence current response component corresponding to the complementary frequency based on the second response component, and obtaining the second positive sequence coupling voltage response component and the second positive sequence coupling current response component corresponding to the target frequency based on the second coupling response component, can be determined by those skilled in the art according to the actual situation. The above description is only an example and does not constitute a limitation.

[0162] For example, obtaining the second negative-sequence voltage response component and the second negative-sequence current response component corresponding to the complementary frequency based on the second response component, and obtaining the second positive-sequence coupled voltage response component and the second positive-sequence coupled current response component corresponding to the target frequency based on the second coupled response component, can be, but is not limited to, analyzing the second response component to obtain the second response component including or corresponding to the second negative-sequence voltage response component and the second negative-sequence current response component at the complementary frequency, and analyzing the second coupled response component to obtain the second coupled response component including or corresponding to the second positive-sequence coupled voltage response component and the second positive-sequence coupled current response component at the target frequency.

[0163] For example, if the impedance information (matrix) to be determined is impedance information with a target frequency of 101Hz (greater than the frequency threshold of 100Hz), then for the applied second perturbation signal (in this example, the injected second perturbation signal at a frequency of 1Hz), the corresponding 1Hz negative sequence response voltage component (second negative sequence voltage response component), 101Hz positive sequence voltage response component (second positive sequence coupling voltage response component), 1Hz negative sequence current response component (second negative sequence current response component), and 101Hz positive sequence current response component (second positive sequence coupling current response component) are extracted.

[0164] It should be noted that the specific implementation of obtaining the second negative-sequence voltage response component and the second negative-sequence current response component corresponding to the complementary frequency based on the second response component, and obtaining the second positive-sequence coupling voltage response component and the second positive-sequence coupling current response component corresponding to the target frequency based on the second coupling response component, can be determined by those skilled in the art according to the actual situation. The above description is only an example and does not constitute a limitation.

[0165] Through the above steps, the operating characteristics and frequency coupling laws of new energy units can be considered in more detail, and more detailed analysis can be performed. For disturbance signals of different frequencies, the corresponding refined components suitable for calculation can be extracted more accurately, thereby further improving the speed and accuracy of determining impedance information, and thus improving the speed and accuracy of overall unit oscillation detection.

[0166] It should be noted that the above-mentioned response components and coupled response components can be obtained by processing the terminal voltage and current after the relevant perturbation signal through existing Fourier decomposition and positive and negative order extraction operations.

[0167] Preferably, the voltage and current disturbance response components can be successfully obtained within the range of the frequency to be measured after injecting disturbance frequencies at frequency intervals.

[0168] In an optional implementation, obtaining the corresponding impedance information based on the first voltage response component, the first current response component, the first coupled voltage response component, the first coupled current response component, the second voltage response component, the second current response component, the second coupled voltage response component, and the second coupled current response component includes:

[0169] Based on the first voltage response component, the second coupled voltage response component, the first coupled voltage response component, and the second voltage response component, the calculated voltage parameters are obtained.

[0170] Based on the first current response component, the second coupled current response component, the first coupled current response component, and the second current response component, the calculated current parameters are obtained.

[0171] The impedance information is obtained based on the calculated voltage and current parameters.

[0172] For example, the calculated voltage parameters, calculated current parameters, and impedance information can all be, but are not limited to, matrix information.

[0173] For example, the calculation of voltage parameters based on the first voltage response component, the second coupled voltage response component, the first coupled voltage response component, and the second voltage response component can be, but is not limited to:

[0174] If the target frequency is less than or equal to a preset frequency threshold, the calculated voltage parameters are represented as the following matrix:

[0175]

[0176] Where, ΔV 1_p (f) represents the first voltage response component, ΔV 2coupled_p (f) represents the second coupled voltage response component. This represents the conjugate operational value of the first coupled voltage response component. The value represents the conjugate operation value of the second voltage response component. 100 represents the preset frequency threshold (in this example, the frequency threshold is 100Hz, and the corresponding fundamental frequency is 50Hz). f represents the target frequency. 100-f represents the complementary frequency. p represents the positive sequence. n represents the negative sequence. coupledd represents the component as a coupled response component. The subscript 1 represents "first" and the subscript 2 represents "second".

[0177] If the target frequency is greater than a preset frequency threshold, the calculated voltage parameters are represented as the following matrix:

[0178]

[0179] Where, ΔV 1_p (f) represents the first voltage response component, ΔV 2coupled_p (f) represents the second coupled voltage response component, ΔV 1coupled_n (f-100) represents the first coupled voltage response component, ΔV 2_n (f-100) represents the second voltage response component, 100 represents the preset frequency threshold (in this example, the frequency threshold is 100Hz, and the corresponding fundamental frequency is 50Hz), f represents the target frequency, f-100 represents the complementary frequency, p represents the positive sequence, n represents the negative sequence, coupledd represents the component is a coupled response component, 1 in the subscript represents "first", and 2 in the subscript represents "second".

[0180] It should be noted that the specific implementation method for obtaining the calculated voltage parameters based on the first voltage response component, the second coupled voltage response component, the first coupled voltage response component, and the second voltage response component can be determined by those skilled in the art according to the actual situation. The above description is only an example and does not constitute a limitation.

[0181] For example, the calculation of current parameters based on the first current response component, the second coupled current response component, the first coupled current response component, and the second current response component can be, but is not limited to:

[0182] If the target frequency is less than or equal to a preset frequency threshold, the current parameters are calculated as follows:

[0183]

[0184] Where, ΔI 1_p (f) represents the first current response component, ΔI 2coupled_p (f) represents the second coupling current response component. This represents the conjugate operational value of the first coupled current response component. The value represents the conjugate operation of the second current response component. 100 represents the preset frequency threshold (in this example, the frequency threshold is 100Hz, and the corresponding fundamental frequency is 50Hz). f represents the target frequency. 100-f represents the complementary frequency. p represents the positive sequence. n represents the negative sequence. coupled indicates that the component is a coupled response component. The subscript 1 represents "first", the subscript 2 represents "second", and "-1" represents the inverse operation.

[0185] If the target frequency is greater than a preset frequency threshold, the calculated current parameters are represented by the following matrix:

[0186]

[0187] Where, ΔI 1_p (f) represents the first current response component, ΔI 2coupled_p (f) represents the second coupling current response component, ΔI 1coupled_n (f-100) represents the first coupling current response component, ΔI 2_n (f-100) represents the second current response component, 100 represents the preset frequency threshold (in this example, the frequency threshold is 100Hz, and the corresponding fundamental frequency is 50Hz), f represents the target frequency, f-100 represents the complementary frequency, p represents the positive sequence, n represents the negative sequence, coupled indicates that the component is a coupled response component, 1 in the subscript means "first", 2 in the subscript means "second", and "-1" means the inverse operation.

[0188] For example, obtaining the impedance information based on the calculated voltage parameters and the calculated current parameters can be, but is not limited to, multiplying the calculated voltage parameters by the calculated current parameters (which can be matrix multiplication) to obtain the impedance information.

[0189] For example, if the target frequency is less than or equal to a preset frequency threshold, the impedance information obtained based on the calculated voltage parameters and calculated current parameters can be expressed as follows:

[0190]

[0191] in, This indicates the impedance information for the target frequency f.

[0192] For example, if the target frequency is greater than a preset frequency threshold, the impedance information obtained based on the calculated voltage parameters and calculated current parameters can be expressed as follows:

[0193]

[0194] in, This indicates the impedance information for the target frequency f.

[0195] It should be noted that the impedance information obtained based on the calculated voltage parameters and calculated current parameters can be, but is not limited to, multiplying the calculated voltage parameters by the calculated current parameters (which can be matrix multiplication) to obtain the impedance information. The specific implementation method can be determined by those skilled in the art based on the actual situation. The above description is only an example and does not constitute a limitation.

[0196] Through the above steps, the relevant characteristics and oscillation patterns of new energy power units can be more fully combined, and appropriate components can be used to calculate and determine impedance information in a more detailed and accurate manner. The overall calculation process has low computational complexity and fast speed, enabling the impedance information to accurately correspond to the target frequency. This improves the speed and accuracy of impedance information determination, and consequently improves the speed and accuracy of overall power equipment fault analysis.

[0197] The power unit oscillation detection method and apparatus of this invention only require injecting a disturbance once for the target frequency and complementary frequency. Based on the complex conjugate relationship between positive and negative sequence components and the relationship between frequency coupling components, two sets of linearly uncorrelated disturbance components are extracted through subsequent data reconstruction, which can save nearly 50% of the disturbance measurement time and effectively improve the speed of overall power equipment fault analysis.

[0198] Based on the same principle, this invention discloses a power unit oscillation detection device 600, such as... Figure 6 As shown, the power unit oscillation detection device 600 includes:

[0199] The disturbance injection module 601 is used to apply a first disturbance signal to the power unit and determine a first power parameter of the power unit corresponding to the first disturbance signal; apply a second disturbance signal to the power unit and determine a second power parameter of the power unit corresponding to the second disturbance signal; wherein, the positive-sequence disturbance frequency and the negative-sequence disturbance frequency of the first disturbance signal are both target frequencies, and the positive-sequence disturbance frequency and the negative-sequence disturbance frequency of the second disturbance signal are both complementary frequencies of the target frequencies;

[0200] The parameter parsing module 602 is used to obtain the corresponding first response component and first coupled response component based on the first power parameter, and to obtain the corresponding second response component and second coupled response component based on the second power parameter.

[0201] The risk detection module 603 is used to obtain the impedance information of the power unit corresponding to the target frequency based on the first response component, the first coupled response component, the second response component, and the second coupled response component, and to determine whether the power unit has an oscillation risk based on the impedance information. If so, an alarm is issued.

[0202] In an optional implementation, a complementary frequency determination module is further included, for:

[0203] Determine the frequency threshold based on the preset base frequency;

[0204] Determine whether the target frequency is less than or equal to the frequency threshold. If yes, subtract the target frequency from the frequency threshold to obtain the complementary frequency; otherwise, subtract the frequency threshold from the target frequency to obtain the complementary frequency.

[0205] In an optional implementation, the disturbance injection module 601 is configured to:

[0206] The disturbance amplitude is determined based on the steady-state voltage amplitude of the power unit;

[0207] Based on the disturbance amplitude, a first positive-sequence voltage disturbance component and a first negative-sequence voltage disturbance component are determined, wherein the positive-sequence disturbance frequency of the first positive-sequence voltage disturbance component and the negative-sequence disturbance frequency of the first negative-sequence voltage disturbance component are both target frequencies, and the first disturbance signal includes the first positive-sequence voltage disturbance component and the first negative-sequence voltage disturbance component.

[0208] The first positive-sequence voltage disturbance component and the first negative-sequence voltage disturbance component are applied to the power unit.

[0209] In an optional implementation, the disturbance injection module 601 is configured to:

[0210] The disturbance amplitude is determined based on the steady-state voltage amplitude of the power unit;

[0211] Based on the disturbance amplitude, a second positive-sequence voltage disturbance component and a second negative-sequence voltage disturbance component are determined, wherein the positive-sequence disturbance frequency of the second positive-sequence voltage disturbance component and the negative-sequence disturbance frequency of the second negative-sequence voltage disturbance component are complementary frequencies of the target frequency, and the second disturbance signal includes the second positive-sequence voltage disturbance component and the second negative-sequence voltage disturbance component.

[0212] The second positive-sequence voltage disturbance component and the second negative-sequence voltage disturbance component are applied to the power unit.

[0213] In an optional implementation, the parameter parsing module 602 is used for:

[0214] Based on the first power parameters, determine the first terminal voltage and the first terminal current after applying the first disturbance signal to the power unit;

[0215] Based on the first terminal voltage, the first terminal current, and a preset decomposition algorithm, the first response component and the first coupled response component are obtained.

[0216] In an optional implementation, the parameter parsing module 602 is used for:

[0217] Based on the second power parameters, determine the second terminal voltage and the second terminal current after applying the second disturbance signal to the power unit;

[0218] Based on the second terminal voltage, the second terminal current, and a preset decomposition algorithm, the second response component and the second coupled response component are obtained.

[0219] In an optional implementation, the risk detection module 603 is used for:

[0220] Based on the first response component, a first voltage response component and a first current response component corresponding to the target frequency are obtained, and based on the first coupling response component, a first coupled voltage response component and a first coupled current response component corresponding to the complementary frequency are obtained.

[0221] Based on the second response component, a second voltage response component and a second current response component corresponding to the complementary frequency are obtained, and based on the second coupling response component, a second coupled voltage response component and a second coupled current response component corresponding to the target frequency are obtained.

[0222] Based on the first voltage response component, the first current response component, the first coupled voltage response component, the first coupled current response component, the second voltage response component, the second current response component, the second coupled voltage response component, and the second coupled current response component, the corresponding impedance information is obtained.

[0223] In an optional implementation, the risk detection module 603 is used for:

[0224] Determine whether the target frequency is less than or equal to a preset frequency threshold;

[0225] If so, based on the first response component, a first positive-sequence voltage response component and a first positive-sequence current response component corresponding to the target frequency are obtained, and based on the first coupling response component, a first positive-sequence coupled voltage response component and a first positive-sequence coupled current response component corresponding to the complementary frequency are obtained; the first positive-sequence voltage response component is used as the first voltage response component, the first positive-sequence current response component is used as the first current response component, the first positive-sequence coupled voltage response component is used as the first coupled voltage response component, and the first positive-sequence coupled current response component is used as the first coupled current response component;

[0226] If not, based on the first response component, a first positive-sequence voltage response component and a first positive-sequence current response component corresponding to the target frequency are obtained, and based on the first coupling response component, a first negative-sequence coupling voltage response component and a first negative-sequence coupling current response component corresponding to the complementary frequency are obtained; the first positive-sequence voltage response component is used as the first voltage response component, the first positive-sequence current response component is used as the first current response component, the first negative-sequence coupling voltage response component is used as the first coupling voltage response component, and the first negative-sequence coupling current response component is used as the first coupling current response component.

[0227] In an optional implementation, the risk detection module 603 is used for:

[0228] Determine whether the target frequency is less than or equal to a preset frequency threshold;

[0229] If so, based on the second response component, a second positive-sequence voltage response component and a second positive-sequence current response component corresponding to the complementary frequency are obtained, and based on the second coupling response component, a second positive-sequence coupled voltage response component and a second positive-sequence coupled current response component corresponding to the target frequency are obtained; the second positive-sequence voltage response component is used as the second voltage response component, the second positive-sequence current response component is used as the second current response component, the second positive-sequence coupled voltage response component is used as the second coupled voltage response component, and the second positive-sequence coupled current response component is used as the second coupled current response component;

[0230] If not, based on the second response component, a second negative-sequence voltage response component and a second negative-sequence current response component corresponding to the complementary frequency are obtained, and based on the second coupling response component, a second positive-sequence coupling voltage response component and a second positive-sequence coupling current response component corresponding to the target frequency are obtained; the second negative-sequence voltage response component is used as the second voltage response component, the second negative-sequence current response component is used as the second current response component, the second positive-sequence coupling voltage response component is used as the second coupling voltage response component, and the second positive-sequence coupling current response component is used as the second coupling current response component.

[0231] In an optional implementation, the risk detection module 603 is used for:

[0232] Based on the first voltage response component, the second coupled voltage response component, the first coupled voltage response component, and the second voltage response component, the calculated voltage parameters are obtained.

[0233] Based on the first current response component, the second coupled current response component, the first coupled current response component, and the second current response component, the calculated current parameters are obtained.

[0234] The impedance information is obtained based on the calculated voltage and current parameters.

[0235] Since the principle of the power unit vibration detection device 600 in solving the problem is similar to the above method, the implementation of this power unit vibration detection device 600 can refer to the implementation of the above method, and will not be repeated here.

[0236] The systems, devices, modules, or units described in the above embodiments can be implemented by computer chips or entities, or by products with certain functions. A typical implementation device is a computer device, specifically, a computer device can be, for example, a personal computer, a laptop computer, a cellular phone, a camera phone, a smartphone, a personal digital assistant, a media player, a navigation device, an email device, a game console, a tablet computer, a wearable device, or any combination of these devices.

[0237] In a typical example, a computer device specifically includes a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor, when executing the program, implements the method described above.

[0238] The following is for reference. Figure 7 It shows a schematic diagram of the structure of a computer device 700 suitable for implementing the embodiments of this application.

[0239] like Figure 7 As shown, the computer device 700 includes a central processing unit (CPU) 701, which can perform various appropriate tasks and processes based on programs stored in read-only memory (ROM) 702 or programs loaded from storage section 708 into random access memory (RAM) 703. The RAM 703 also stores various programs and data required for the operation of the system 700. The CPU 701, ROM 702, and RAM 703 are interconnected via a bus 704. An input / output (I / O) interface 705 is also connected to the bus 704.

[0240] The following components are connected to the I / O interface 705: an input section 706 including a keyboard, mouse, etc.; an output section 707 including a cathode ray tube (CRT), liquid crystal feedback (LCD), etc., and speakers, etc.; a storage section 708 including a hard disk, etc.; and a communication section 709 including a network interface card such as a LAN card, modem, etc. The communication section 709 performs communication processing via a network such as the Internet. A drive 710 is also connected to the I / O interface 705 as needed. A removable medium 711, such as a disk, optical disk, magneto-optical disk, semiconductor memory, etc., is installed on the drive 710 as needed so that computer programs read from it can be installed in the storage section 708 as needed.

[0241] In particular, according to embodiments of the present invention, the processes described above with reference to the flowcharts can be implemented as computer software programs. For example, embodiments of the present invention include a computer program product comprising a computer program tangibly embodied on a machine-readable medium, the computer program including program code for performing the methods shown in the flowcharts. In such embodiments, the computer program can be downloaded and installed from a network via communication section 709, and / or installed from removable medium 711.

[0242] Computer-readable media includes both permanent and non-permanent, removable and non-removable media that can store information using any method or technology. Information can be computer-readable instructions, data structures, modules of programs, 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 magnetic disk storage or other magnetic storage devices, or any other non-transferable medium that can be used to store information accessible by a computing device. As defined herein, computer-readable media does not include transient computer-readable media, such as modulated data signals and carrier waves.

[0243] For ease of description, the above devices are described separately by function as various units. Of course, in implementing this application, the functions of each unit can be implemented in one or more software and / or hardware.

[0244] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0245] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0246] These computer program instructions 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 of the function specified in one or more boxes.

[0247] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0248] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0249] This application can be described in the general context of computer-executable instructions, such as program modules, that are executed by a computer. Generally, program modules include routines, programs, objects, components, data structures, etc., that perform a specific task or implement a specific abstract data type. This application can also be practiced in distributed computing environments where tasks are performed by remote processing devices connected via a communication network. In distributed computing environments, program modules can reside in local and remote computer storage media, including storage devices.

[0250] The various embodiments in this specification are described in a progressive manner. Similar or identical parts between embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. In particular, the system embodiments are basically similar to the method embodiments, so the description is relatively simple; relevant parts can be referred to the descriptions in the method embodiments.

[0251] The above description is merely an embodiment of this application and is not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. A method of detecting oscillations in a power unit, characterized by, The method comprises: applying a first disturbance signal to a power unit to determine a first power parameter of the power unit corresponding to the first disturbance signal; applying a second disturbance signal to the power unit to determine a second power parameter of the power unit corresponding to the second disturbance signal; wherein the positive sequence disturbance frequency and the negative sequence disturbance frequency of the first disturbance signal are both target frequencies, the target frequencies are within a preset frequency range, and the target frequencies are multiple, and the positive sequence disturbance frequency and the negative sequence disturbance frequency of the second disturbance signal are both complementary frequencies of the target frequencies; based on the first power parameter, obtaining a corresponding first response component and a first coupled response component, and based on the second power parameter, obtaining a corresponding second response component and a second coupled response component; based on the first response component, the first coupled response component, the second response component and the second coupled response component, obtaining impedance information of the power unit corresponding to the target frequency, and based on the impedance information, determining whether the power unit has an oscillation risk, and if so, issuing an alarm.

2. The method of claim 1, wherein, Further comprising: determining a frequency threshold based on a preset fundamental frequency; determining whether the target frequency is less than or equal to the frequency threshold, if so, subtracting the target frequency from the frequency threshold to obtain the complementary frequency; if not, subtracting the frequency threshold from the target frequency to obtain the complementary frequency.

3. The method of claim 1, wherein, The method comprises: determining a disturbance amplitude based on a steady-state voltage amplitude of the power unit; determining a first positive sequence voltage disturbance component and a first negative sequence voltage disturbance component based on the disturbance amplitude, wherein the positive sequence disturbance frequency of the first positive sequence voltage disturbance component and the negative sequence disturbance frequency of the first negative sequence voltage disturbance component are both target frequencies, and the first disturbance signal comprises the first positive sequence voltage disturbance component and the first negative sequence voltage disturbance component; applying the first positive sequence voltage disturbance component and the first negative sequence voltage disturbance component to the power unit.

4. The method of claim 1, wherein, The method comprises: determining a disturbance amplitude based on a steady-state voltage amplitude of the power unit; determining a second positive sequence voltage disturbance component and a second negative sequence voltage disturbance component based on the disturbance amplitude, wherein the positive sequence disturbance frequency of the second positive sequence voltage disturbance component and the negative sequence disturbance frequency of the second negative sequence voltage disturbance component are both complementary frequencies of the target frequencies, and the second disturbance signal comprises the second positive sequence voltage disturbance component and the second negative sequence voltage disturbance component; applying the second positive sequence voltage disturbance component and the second negative sequence voltage disturbance component to the power unit.

5. The method of claim 1, wherein, The method comprises: determining a first machine terminal voltage and a first machine terminal current after the first disturbance signal is applied to the power unit based on the first power parameter; obtaining the first response component and the first coupled response component based on the first machine terminal voltage, the first machine terminal current and a preset decomposition algorithm.

6. The method of claim 1, wherein, The method comprises: determine a second machine terminal voltage and a second machine terminal current after the second disturbance signal is applied to the power unit based on the second power parameter; obtain the second response component and the second coupling response component based on the second machine terminal voltage, the second machine terminal current and a preset decomposition algorithm.

7. The method of claim 1, wherein, The obtaining of the impedance information corresponding to the target frequency of the power unit based on the first response component, the first coupling response component, the second response component and the second coupling response component comprises: obtaining a first voltage response component and a first current response component corresponding to the target frequency based on the first response component, and obtaining a first coupling voltage response component and a first coupling current response component corresponding to the complementary frequency based on the first coupling response component; obtaining a second voltage response component and a second current response component corresponding to the complementary frequency based on the second response component, and obtaining a second coupling voltage response component and a second coupling current response component corresponding to the target frequency based on the second coupling response component; obtaining the impedance information corresponding to the target frequency based on the first voltage response component, the first current response component, the first coupling voltage response component, the first coupling current response component, the second voltage response component, the second current response component, the second coupling voltage response component and the second coupling current response component.

8. The method of claim 7, wherein, The obtaining of the first voltage response component and the first current response component corresponding to the target frequency based on the first response component, and the obtaining of the first coupling voltage response component and the first coupling current response component corresponding to the complementary frequency based on the first coupling response component comprises: determining whether the target frequency is less than or equal to a preset frequency threshold; if yes, obtaining a first positive sequence voltage response component and a first positive sequence current response component corresponding to the target frequency based on the first response component, and obtaining a first positive sequence coupling voltage response component and a first positive sequence coupling current response component corresponding to the complementary frequency based on the first coupling response component; taking the first positive sequence voltage response component as the first voltage response component, taking the first positive sequence current response component as the first current response component, taking the first positive sequence coupling voltage response component as the first coupling voltage response component, and taking the first positive sequence coupling current response component as the first coupling current response component; if no, obtaining a first positive sequence voltage response component and a first positive sequence current response component corresponding to the target frequency based on the first response component, and obtaining a first negative sequence coupling voltage response component and a first negative sequence coupling current response component corresponding to the complementary frequency based on the first coupling response component; taking the first positive sequence voltage response component as the first voltage response component, taking the first positive sequence current response component as the first current response component, taking the first negative sequence coupling voltage response component as the first coupling voltage response component, and taking the first negative sequence coupling current response component as the first coupling current response component.

9. The method of claim 7, wherein, The second voltage response component and the second current response component corresponding to the complementary frequency are obtained based on the second response component, and the second coupled voltage response component and the second coupled current response component corresponding to the target frequency are obtained based on the second coupled response component, including: determining whether the target frequency is less than or equal to a preset frequency threshold; if yes, the second positive sequence voltage response component and the second positive sequence current response component corresponding to the complementary frequency are obtained based on the second response component, and the second positive sequence coupled voltage response component and the second positive sequence coupled current response component corresponding to the target frequency are obtained based on the second coupled response component; the second positive sequence voltage response component is taken as the second voltage response component, the second positive sequence current response component is taken as the second current response component, the second positive sequence coupled voltage response component is taken as the second coupled voltage response component, and the second positive sequence coupled current response component is taken as the second coupled current response component; if no, the second negative sequence voltage response component and the second negative sequence current response component corresponding to the complementary frequency are obtained based on the second response component, and the second positive sequence coupled voltage response component and the second positive sequence coupled current response component corresponding to the target frequency are obtained based on the second coupled response component; the second negative sequence voltage response component is taken as the second voltage response component, the second negative sequence current response component is taken as the second current response component, the second positive sequence coupled voltage response component is taken as the second coupled voltage response component, and the second positive sequence coupled current response component is taken as the second coupled current response component.

10. The method of claim 7, wherein, The impedance information is obtained based on the first voltage response component, the first current response component, the first coupled voltage response component, the first coupled current response component, the second voltage response component, the second current response component, the second coupled voltage response component and the second coupled current response component, including: a calculation voltage parameter is obtained based on the first voltage response component, the second coupled voltage response component, the first coupled voltage response component and the second voltage response component; a calculation current parameter is obtained based on the first current response component, the second coupled current response component, the first coupled current response component and the second current response component; the impedance information is obtained based on the calculation voltage parameter and the calculation current parameter.

11. An electrical power plant oscillation detection apparatus characterized by comprising: including: a disturbance injection module for applying a first disturbance signal to a power unit and determining a first power parameter of the power unit corresponding to the first disturbance signal; a second disturbance signal is applied to the power unit to determine a second power parameter of the power unit corresponding to the second disturbance signal; wherein the positive sequence disturbance frequency and the negative sequence disturbance frequency of the first disturbance signal are both target frequencies, the target frequency is within a preset frequency range, and the target frequency is multiple, and the positive sequence disturbance frequency and the negative sequence disturbance frequency of the second disturbance signal are both complementary frequencies of the target frequency; a parameter analysis module, configured to obtain a first response component and a first coupling response component corresponding to the first power parameter, and obtain a second response component and a second coupling response component corresponding to the second power parameter; a risk detection module, configured to obtain impedance information of the power unit corresponding to the target frequency based on the first response component, the first coupling response component, the second response component and the second coupling response component, and determine whether the power unit has an oscillation risk based on the impedance information, and if so, perform an alarm.

12. A computer device comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, characterized in that, The processor implements the method in any one of claims 1-10 when executing the program.

13. A computer readable medium having stored thereon a computer program, characterized in that The program is executed by the processor to implement the method in any one of claims 1-10.

14. A computer program product, characterised in that, The computer program product comprises a computer program, and the computer program is executed by the processor to implement the method in any one of claims 1-10.

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