Resonance protection method, device, equipment, storage medium and program product

Abstract

The invention relates to a resonance protection method and device, equipment, a storage medium and a program product. The method comprises the following steps: acquiring voltage and current data of a target node of a to-be-tested power system; determining an inter-harmonic set and an inter-harmonic subset from the voltage and current data; if the root-mean-square values of the inter-harmonic set and the inter-harmonic subset meet the triggering condition of resonance protection, extracting peak and valley moments of voltage from the voltage and current data by using an adaptive multi-scale peak detection algorithm; determining resonance protection parameters of the target node according to the peak and valley moments; and performing resonance protection on the target node according to the resonance protection parameter. By adopting the method, the anti-interference capability can be improved.

Description

Technical Field

[0001] The present application relates to the field of power electronics technology, and in particular to a resonance protection method, device, equipment, storage medium, and program product. Background Art

[0002] With the widespread integration of large generators into the grid and the increasing popularity of long-distance transmission lines, subsynchronous and supersynchronous resonances (SSRs) in power systems are becoming increasingly prominent. These resonances, primarily caused by electromagnetic or electromechanical coupling within the power system, can cause severe consequences such as severe vibration, mechanical fatigue, and even shaft breakage in the generator shaft, posing a serious threat to the safety and stability of system operations.

[0003] Related technologies for monitoring and protecting against subsynchronous and supersynchronous resonances primarily include Fourier transforms based on frequency domain analysis, Hilbert transforms based on time domain signal envelope recognition, and judgment algorithms based on instantaneous power theory. However, these related technologies typically lack robustness against interference. Summary of the Invention

[0004] Based on this, it is necessary to provide a resonance protection method, device, equipment, storage medium and program product that can improve anti-interference capability in response to the above technical problems.

[0005] In a first aspect, the present application provides a resonance protection method, comprising:

[0006] Obtaining voltage and current data of a target node of the power system to be tested;

[0007] Determining an interharmonic set and an interharmonic subset from the voltage and current data;

[0008] If the root mean square values ​​of the interharmonic set and the interharmonic subset meet the triggering condition of the resonance protection, an adaptive multi-scale peak detection algorithm is used to extract the peak and valley moments of the voltage from the voltage and current data;

[0009] determining a resonance protection parameter of the target node according to the peak and valley moments;

[0010] Resonance protection is performed on the target node according to the resonance protection parameter.

[0011] In one embodiment, the triggering condition of the resonance protection includes that the root mean square value of the interharmonic subset is greater than a root mean square threshold, and the ratio of the root mean square value of the interharmonic subset to the root mean square value of the interharmonic set is greater than a ratio threshold.

[0012] In one of the embodiments, the extracting the peak and valley time of the voltage from the voltage and current data using the adaptive multi-scale peak detection algorithm comprises:

[0013] determining the data of the instantaneous voltage corresponding to the triggering time of the resonance protection from the voltage and current data;

[0014] extracting the peak and valley time from the data of the instantaneous voltage using the adaptive multi-scale peak detection algorithm.

[0015] In one of the embodiments, the data of the instantaneous voltage comprises the effective value of the instantaneous voltage or the instantaneous power component of the instantaneous voltage.

[0016] In one of the embodiments, the resonance protection of the target node according to the resonance protection parameter comprises:

[0017] if any of the resonance protection parameters exceeds the corresponding resonance protection threshold, determining that the target node enters a synchronous resonance state;

[0018] in response to the synchronous resonance state, triggering the resonance protection action on the target node.

[0019] In one of the embodiments, the resonance protection parameter comprises at least one of the following: oscillation frequency, instantaneous voltage oscillation amplitude, inter-harmonic voltage content rate, oscillation power absolute value, oscillation power unit value, and oscillation power effective value.

[0020] In a second aspect, the present application provides a resonance protection device, comprising:

[0021] an acquisition module, configured to acquire voltage and current data of a target node of a power system to be tested, and determine an inter-harmonic set and an inter-harmonic subset from the voltage and current data;

[0022] a triggering module, configured to use an adaptive multi-scale peak detection algorithm to extract a peak and valley time of a voltage from the voltage and current data if a root mean square value of the inter-harmonic set and the inter-harmonic subset meets a triggering condition of resonance protection;

[0023] a determination module, configured to determine a resonance protection parameter of the target node according to the peak and valley time;

[0024] a protection module, configured to perform resonance protection on the target node according to the resonance protection parameter.

[0025] In one of the embodiments, the triggering condition of the resonance protection comprises that the root mean square value of the inter-harmonic subset is greater than a root mean square threshold, and a ratio of the root mean square value of the inter-harmonic subset to the root mean square value of the inter-harmonic set is greater than a ratio threshold.

[0026] In one of the embodiments, the triggering module is further configured to determine, from the voltage and current data, data of an instantaneous voltage corresponding to the triggering time of the resonance protection; and extract, using the adaptive multi-scale peak detection algorithm, the peak-valley time from the data of the instantaneous voltage.

[0027] In one of the embodiments, the data of the instantaneous voltage comprises an effective value of the instantaneous voltage or an instantaneous power component of the instantaneous voltage.

[0028] In one of the embodiments, the triggering module is further configured to determine that the target node enters a synchronous resonance state if any of the resonance protection parameters exceeds a corresponding resonance protection threshold; and trigger, in response to the synchronous resonance state, the resonance protection action on the target node.

[0029] In one of the embodiments, the resonance protection parameters comprise at least one of the following: an oscillation frequency, an instantaneous voltage oscillation amplitude, a harmonic voltage content rate, an oscillation power absolute value, an oscillation power unit value, and an oscillation power effective value.

[0030] In a third aspect, the present application further provides a computer device, comprising a memory and a processor, the memory stores a computer program, and the processor implements the resonance protection method of the first aspect when executing the computer program.

[0031] In a fourth aspect, the present application further provides a computer readable storage medium, which stores a computer program, and the computer program is executed by a processor to implement the resonance protection method of the first aspect.

[0032] In a fifth aspect, the present application further provides a computer program product, comprising a computer program, and the computer program is executed by a processor to implement the resonance protection method of the first aspect.

[0033] The resonance protection method, device, equipment, storage medium and program product obtain voltage and current data of a target node of a power system to be measured; determine an inter-harmonic set and an inter-harmonic subset from the voltage and current data; if a root mean square value of the inter-harmonic set and the inter-harmonic subset meets a triggering condition of resonance protection, use an adaptive multi-scale peak value detection algorithm to extract peak and valley moments of voltage from the voltage and current data; determine a resonance protection parameter of the target node according to the peak and valley moments; and perform resonance protection on the target node according to the resonance protection parameter. Since the resonance protection is triggered in combination with the root mean square value of the inter-harmonic set and the inter-harmonic subset, false judgments caused by spectrum leakage are effectively avoided. Moreover, the adaptive multi-scale peak value detection algorithm is used to determine the peak and valley moments of the voltage, so as to determine the resonance protection parameter, realize accurate extraction of local extreme points in a signal under multi-scale, overcome false detection problems caused by improper window length selection and noise interference, and thus improve the anti-interference capability. BRIEF DESCRIPTION OF DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the related art, the drawings needed to be used in the description of the embodiments of the present application or the related art will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other related drawings can be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0035] Figure 1 An application environment diagram of a resonance protection method provided by an embodiment of the present application;

[0036] Figure 2 A flowchart of a resonance protection method provided by an embodiment of the present application;

[0037] Figure 3 A change trend diagram of a harmonic set root mean square value and an inter-harmonic subset root mean square value based on inter-harmonic voltage provided by an embodiment of the present application;

[0038] Figure 4 A change trend diagram of a harmonic set root mean square value and an inter-harmonic subset root mean square value based on inter-harmonic current provided by an embodiment of the present application;

[0039] Figure 5 A global diagram of a peak and valley detection result of instantaneous voltage provided by an embodiment of the present application;

[0040] Figure 6 A local expanded diagram of a peak and valley detection result of instantaneous voltage provided by an embodiment of the present application;

[0041] Figure 7 A fluctuation frequency diagram of instantaneous voltage provided by an embodiment of the present application;

[0042] Figure 8 A fluctuation rate diagram of transient voltage provided for an embodiment of the present application;

[0043] Figure 9 A global diagram of dominant inter-harmonic voltage content and content rate results of transient voltage fluctuation calculation provided for an embodiment of the present application;

[0044] Figure 10 A local expansion diagram of dominant inter-harmonic voltage content and content rate results of transient voltage fluctuation calculation provided for an embodiment of the present application;

[0045] Figure 11 A peak and valley detection result diagram of transient active power provided for an embodiment of the present application;

[0046] Figure 12 A peak and valley detection result diagram of transient reactive power provided for an embodiment of the present application;

[0047] Figure 13 A key oscillation parameter trend diagram of transient active power provided for an embodiment of the present application;

[0048] Figure 14 A key oscillation parameter trend diagram of transient reactive power provided for an embodiment of the present application;

[0049] Figure 15 A flowchart of another resonance protection method provided for an embodiment of the present application;

[0050] Figure 16 A structural block diagram of a resonance protection device provided for an embodiment of the present application;

[0051] Figure 17 An internal structure diagram of a computer device provided for an embodiment of the present application. DETAILED DESCRIPTION

[0052] In order to make the purpose, technical scheme and advantages of the present application clearer, further detailed description will be given to the present application in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application, and are not used to limit the present application.

[0053] The resonance protection method provided by the embodiments of the present application can be applied in an application environment as shown in the following figure. Figure 1 In the figure, the terminal 102 communicates with the server 104 through a network. The data storage system can store data required to be processed by the server 104. The data storage system can be integrated on the server 104, or placed on a cloud or other network server.

[0054] The terminal 102 can obtain the voltage and current data of the target node of the to-be-tested power system and send the voltage and current data to the server 104. After the server 104 obtains the voltage and current data of the target node of the to-be-tested power system, the server 104 can determine the root mean square values of the inter-harmonic set and the inter-harmonic subset from the voltage and current data. If the root mean square values of the inter-harmonic set and the inter-harmonic subset satisfy the triggering condition of the resonance protection, the server 104 uses the adaptive multi-scale peak detection algorithm to extract the peak and valley time of the voltage from the voltage and current data. Subsequently, the server 104 determines the resonance protection parameter of the target node according to the peak and valley time. Finally, the server 104 performs resonance protection on the target node according to the resonance protection parameter.

[0055] The terminal 102 can be a power signal collection device, which includes but is not limited to various personal computers, notebook computers, smart phones, tablet computers, Internet of Things devices, and portable wearable devices. The Internet of Things device can be a smart speaker, a smart television, a smart air conditioner, a smart vehicle-mounted device, a projection device, etc. The portable wearable device can be a smart watch, a smart bracelet, a head-mounted device, etc. The head-mounted device can be a virtual reality (VR) device, an augmented reality (AR) device, smart glasses, etc. The server 104 can be a standalone physical server, a server cluster or a distributed system composed of multiple physical servers, or a cloud server providing cloud computing services.

[0056] In an exemplary embodiment, as shown in Figure 2 , a resonance protection method is provided, which is applied to the server in Figure 1 for illustration, including S201 to S205:

[0057] S201, obtaining voltage and current data of a target node of a to-be-tested power system.

[0058] In this application, when the power system needs to be protected from resonance, the voltage and current data of the target node of the to-be-tested power system can be obtained first.

[0059] The target node can be any system node in the power system. The voltage and current data are data of three-phase voltage signals and current signals of the to-be-tested power system.

[0060] In some embodiments, the voltage and current data of the target node of the power system under test can be collected by a power signal collection device arranged on the target node. Subsequently, the power signal collection device can send the voltage and current data of the target node of the power system under test to the server in real time, or send the voltage and current data of the target node of the power system under test to the server at a preset time interval, for example, every half hour, every ten minutes or every five minutes.

[0061] S202, from the voltage and current data, the root mean square values of the inter-harmonic set and the inter-harmonic subset are determined.

[0062] In this step, after the server obtains the voltage and current data of the target node of the power system under test, the root mean square values of the inter-harmonic set and the inter-harmonic subset can be determined from the voltage and current data.

[0063] The inter-harmonic set includes a collection of all inter-harmonics detected in the voltage and current data, including characteristic parameters such as frequency, amplitude, phase, etc. The inter-harmonic subset is a part of the inter-harmonics divided from the inter-harmonic set according to a specific standard. For example, the standard for dividing the inter-harmonic subset can include frequency range, amplitude threshold, load source, etc., which is not limited by the embodiments of the present application.

[0064] For example, since the voltage and current data contains all electrical information of the system operation, it is essentially a superposition of the fundamental wave, integer harmonic, inter-harmonic and noise. Therefore, the harmonics of non-integer times of the fundamental frequency can be extracted from the voltage and current data, thereby obtaining the inter-harmonic set. Then, the inter-harmonic subset is obtained by dividing part of the inter-harmonics based on a specific standard.

[0065] For example, the square of the inter-harmonics in the inter-harmonic set can be taken, and then the average of the square values is calculated, and finally the square root of the average value is taken to obtain the root mean square value of the inter-harmonic set. Correspondingly, the square of the inter-harmonics in the inter-harmonic subset can be taken, and then the average of the square values is calculated, and finally the square root of the average value is taken to obtain the root mean square value of the inter-harmonic subset.

[0066] It should be understood that the embodiments of the present application do not limit the number of the determined inter-harmonic set and inter-harmonic subset, which can be one or more. For example, to avoid the influence of the fundamental component spectrum leakage on the inter-harmonic monitoring result, the 0th inter-harmonic set root mean square value and the inter-harmonic subset root mean square value, and the 1st inter-harmonic set root mean square value and the inter-harmonic subset root mean square value can be determined at the same time.

[0067] S203, if the root mean square values of the inter-harmonic set and the inter-harmonic subset satisfy the triggering condition of the resonance protection, the peak and valley time of the voltage is extracted from the voltage and current data using an adaptive multi-scale peak detection algorithm.

[0068] In this step, after the server determines the RMS values of the inter-harmonic set and the inter-harmonic subset from the voltage and current data, it can determine whether the RMS values of the inter-harmonic set and the inter-harmonic subset satisfy the triggering condition of the resonance protection. If the RMS values of the inter-harmonic set and the inter-harmonic subset satisfy the triggering condition of the resonance protection, the server uses the adaptive multi-scale peak detection algorithm to extract the peak and valley time points of the voltage from the voltage and current data.

[0069] It should be understood that the embodiments of the present application do not limit the triggering condition of the resonance protection described above. In some embodiments, the triggering condition of the resonance protection includes that the RMS value of the inter-harmonic set is greater than the RMS threshold, and the ratio of the RMS value of the inter-harmonic subset to the RMS value of the inter-harmonic set is greater than the ratio threshold.

[0070] The RMS threshold and the ratio threshold described above can be set according to actual conditions, and the embodiments of the present application do not limit this. For example, when the power grid experiences subsynchronous resonance, the inter-harmonic voltage content can reach 5%-10%, so the RMS threshold can be set to 0.5%-2%, for example, the RMS threshold can be 0.5%, 1%, 1.5%, 2%, and the ratio threshold can be 0.5, 0.6, 0.7, 0.8, etc.

[0071] For example, taking the 0th inter-harmonic voltage as an example, if it is monitored that the RMS value of the 0th inter-harmonic subset exceeds the RMS threshold of 0.5%, and the ratio of the RMS value of the 0th inter-harmonic subset to the RMS value of the inter-harmonic set exceeds the ratio threshold of 0.8, it means that there is a larger inter-harmonic component between 5Hz-45Hz, and to avoid misjudgment caused by spectrum leakage, the triggering condition of the resonance protection is satisfied.

[0072] For example, as shown in FIGS. 1 and 2, the 1st inter-harmonic voltage content of the low-voltage side of the main transformer is between 4%-8%, the 0th inter-harmonic voltage content is between 1.7%-4%, the 1st inter-harmonic voltage is obviously higher than the 0th inter-harmonic voltage, and the RMS value of the inter-harmonic set and the RMS value of the inter-harmonic subset are basically equal, which can exclude the influence of the fundamental voltage spectrum leakage, that is, there is a larger inter-harmonic frequency component between 55Hz-95Hz. Figure 3 Figure 4

[0073] It should be understood that the embodiments of the present application do not limit how to use the adaptive multi-scale peak detection algorithm to extract the peak and valley time points of the voltage from the voltage and current data. In some embodiments, the server can first determine the data of the instantaneous voltage corresponding to the triggering time of the resonance protection from the voltage and current data, and then use the adaptive multi-scale peak detection algorithm to extract the peak and valley time points from the data of the instantaneous voltage.

[0074] ​​The data of the instantaneous voltage can include an effective value of the instantaneous voltage or an instantaneous power component of the instantaneous voltage.

[0075] Exemplarily, when the trigger condition of the resonance protection is met, the instantaneous voltage or the instantaneous power theory can be used to characterize the subsynchronous resonance and the supersynchronous resonance. Correspondingly, the data of the instantaneous voltage (for example, the effective value of the instantaneous voltage or the instantaneous power component of the instantaneous voltage) can be calculated after filtering the voltage and current data. Then, the data of the instantaneous voltage can be input into the adaptive multi-scale peak detection algorithm, and the peak and valley values output by the adaptive multi-scale peak detection algorithm can be obtained. After determining the peak and valley values, the peak-valley time points can be extracted from the data of the instantaneous voltage. Exemplarily, the peak-valley time points extracted from the data of the instantaneous voltage can be as shown in FIGS. 1 and 2. Figure 5 and Figure 6

[0076] The adaptive multi-scale peak detection algorithm is a peak-valley value identification method for complex signals. The potential peak-valley values under different resolutions are captured through multi-scale analysis, and the parameters are dynamically adjusted in combination with an adaptive mechanism to adapt to the signal characteristics, so that the peak-valley value detection with higher accuracy and better noise resistance is finally realized.

[0077] S204, determining the resonance protection parameter of the target node according to the peak-valley time points.

[0078] In this step, when the server determines the peak-valley time points, the resonance protection parameter of the target node can be determined.

[0079] The resonance protection parameter includes at least one of the following: an oscillation frequency, an instantaneous voltage oscillation amplitude, an inter-harmonic voltage content rate, an oscillation power absolute value, an oscillation power unit value, and an oscillation power effective value.

[0080] It should be understood that the peak-valley time points can be positions or times at which the peak value of the instantaneous voltage is located, and positions or times at which the valley value of the instantaneous voltage is located.

[0081] Exemplarily, the position at which the peak value of the instantaneous voltage is located can be denoted as , the position at which the valley value of the instantaneous voltage is located can be denoted as , k is a serial number, The oscillation frequency of the instantaneous voltage can be calculated by formula (1).

[0082] (1)

[0083] wherein, is the oscillation frequency of the instantaneous voltage, t is time, is a time difference, is the time corresponding to the second peak value to the last peak value, respectively, ​the time corresponding to the first peak to the second last peak.

[0084] For example, the instantaneous voltage oscillation amplitude can be calculated by formula (2).

[0085] (2)

[0086] wherein, is the instantaneous voltage oscillation amplitude, is the position of the peak of the instantaneous voltage, is the position of the valley of the instantaneous voltage, is a function of the instantaneous voltage with respect to time (or position).

[0087] For example, after calculating the instantaneous voltage oscillation amplitude, the instantaneous voltage fluctuation rate and the harmonic voltage content rate can be further calculated based on the instantaneous voltage oscillation amplitude. The calculation of the instantaneous voltage fluctuation rate can be shown in formula (3), and the calculation of the harmonic voltage content rate can be shown in formula (4).

[0088] (3)

[0089] (4)

[0090] wherein, is the instantaneous voltage fluctuation rate, is the instantaneous voltage oscillation amplitude, is the position of the peak of the instantaneous voltage, is the position of the valley of the instantaneous voltage. HRU is the harmonic voltage content rate, is a function of the instantaneous voltage with respect to time (or position).

[0091] For example, the oscillation power absolute value can be calculated by formula (5). The oscillation power unit value can be calculated by formula (6). The oscillation power effective value can be calculated by formula (7).

[0092] (5)

[0093] (6)

[0094] (7)

[0095] wherein, is the oscillation power absolute value, is the oscillation power unit value, is the oscillation power effective value, is the position of the peak of the instantaneous voltage, is the location of the valley value of the instantaneous voltage.

[0096] For example, after identifying the peak and valley moments of the instantaneous voltage, the corresponding frequencies between the peak values ​​and the voltage fluctuation rates corresponding to the peak and valley values ​​can be further calculated. Figure 7 and Figure 8 As shown in the figure, during the 20-second test, the oscillation frequency and fluctuation rate of the instantaneous voltage varied periodically, with a negative correlation between the oscillation frequency and the voltage fluctuation rate. Furthermore, the oscillation frequency of the instantaneous voltage ranged from 11.8Hz to 19.7Hz, with an average oscillation frequency of 14.3Hz, which is consistent with the oscillation frequency of 14Hz calculated based on a 50-cycle FFT.

[0097] For example, based on the oscillation parameters of the instantaneous voltage, the interharmonic voltage content and interharmonic voltage content rate can be further calculated. Figure 9 and Figure 10 As shown, during the 20-second test, the interharmonic voltage content ranged from 117.8V to 467.9V, with an average value of 335.4V.

[0098] For example, the instantaneous voltage data includes the instantaneous power component of the instantaneous voltage. Accordingly, the peak and valley values ​​of the instantaneous power can also be detected based on the AMPD peak detection algorithm, where the peak and valley value detection results of the instantaneous active power and instantaneous reactive power in the first 2 seconds are as follows: Figure 11 and Figure 12 Based on the peak detection results, the fluctuation frequency, oscillation power absolute value, and oscillation power relative value of the instantaneous active power and instantaneous reactive power can be calculated. The calculation results are shown in Figure 13 and Figure 14 shown.

[0099] The oscillation frequency of the instantaneous active power ranges from 12.6Hz to 18.6Hz, with an average oscillation frequency of 14.3Hz, which is essentially the same as the oscillation frequency of the instantaneous voltage RMS value. The absolute value of the oscillation power of the instantaneous active power ranges from 9.1MW to 24.1MW, with an average of 17.6MW. Relative to the rated power, the average oscillation power reaches 28.0%. The oscillation frequency of the instantaneous reactive power also ranges from 12.6Hz to 18.6Hz, with an average oscillation frequency of 14.3Hz, which is exactly the same as the oscillation frequency of the instantaneous active power. However, the absolute value of the oscillation power of the instantaneous reactive power ranges from 18.8MW to 52.3MW, with an average of 37.9M, and the average oscillation power reaches 60.2%, approximately twice the oscillation power of the instantaneous active power.

[0100] S205: Perform resonance protection on the target node according to the resonance protection parameter.

[0101] In this step, when the server determines the resonance protection parameters of the target node according to the peak and valley moments, the resonance protection parameters can be used to perform resonance protection on the target node.

[0102] In some embodiments, if any of the resonance protection parameters exceeds the corresponding resonance protection threshold, the server determines that the target node enters a synchronous resonance state. In response to the synchronous resonance state, the server triggers a resonance protection action on the target node.

[0103] For example, each resonance protection parameter can be used as a resonance indicator to set a corresponding resonance protection threshold. If the value of any resonance protection parameter exceeds the resonance protection threshold, it can be determined that the target node is in subsynchronous resonance and supersynchronous resonance, and the state of the target node can be modified to a synchronous resonance state, thereby triggering a resonance protection action on the target node.

[0104] For example, the resonance protection action on the target node can be implemented by a protection device. The server can output reliable and timely protection instructions to instruct the protection device to act, and the server can output parameter values to trigger the protection action.

[0105] In this application, harmonic monitoring is combined with instantaneous voltage and power signal analysis. By analyzing the harmonic content, the trigger detection is realized to avoid false response to the fundamental wave and low-frequency noise. An adaptive multi-scale peak detection algorithm is introduced to perform multi-scale adaptive detection on the resonance peaks hidden in the signal, effectively overcoming the defects of traditional algorithms that are sensitive to window length, noise and other parameters. In addition, by extracting the peak and valley moments, the oscillation frequency, oscillation amplitude, inter-harmonic content rate and other key characteristic indicators are calculated, and in combination with the relevant resonance protection threshold, a protection instruction is issued to realize the rapid identification and disposal of subsynchronous resonance or supersynchronous resonance phenomena in the power grid. This strategy responds quickly, has a low false alarm rate, and has low implementation complexity, and is suitable for online protection applications in complex power grid disturbance environments.

[0106] The resonant protection method provided by the embodiments of the present application comprises the following steps: obtaining voltage and current data of a target node of a power system to be measured; determining an inter-harmonic set and an inter-harmonic subset from the voltage and current data; if the root mean square values of the inter-harmonic set and the inter-harmonic subset satisfy a triggering condition of resonant protection, using an adaptive multi-scale peak value detection algorithm to extract peak and valley time points of voltage from the voltage and current data; determining a resonant protection parameter of the target node according to the peak and valley time points; and performing resonant protection on the target node according to the resonant protection parameter. Since the triggering of resonant protection is combined with the root mean square values of the inter-harmonic set and the inter-harmonic subset, false judgments caused by spectrum leakage are effectively avoided. Moreover, the adaptive multi-scale peak value detection algorithm is used to determine the peak and valley time points of voltage, so as to determine the resonant protection parameter, to realize accurate extraction of local extreme points in signals under multi-scale, to overcome false detection problems caused by improper window length selection and noise interference, and to improve the anti-interference capability.

[0107] Figure 15 The flowchart of another resonant protection method provided by the embodiments of the present application is shown in FIG. 3, which comprises steps S301 to S307. Figure 15

[0108] S301, obtaining voltage and current data of a target node of a power system to be measured.

[0109] S302, determining root mean square values of an inter-harmonic set and an inter-harmonic subset from the voltage and current data.

[0110] S303, if the root mean square values of the inter-harmonic set and the inter-harmonic subset satisfy a triggering condition of resonant protection, determining data of instantaneous voltage corresponding to a triggering time of resonant protection from the voltage and current data.

[0111] The triggering condition of resonant protection comprises that the root mean square value of the inter-harmonic subset is greater than a root mean square threshold value, and the ratio of the root mean square value of the inter-harmonic subset to the root mean square value of the inter-harmonic set is greater than a ratio threshold value.

[0112] The data of instantaneous voltage comprises an effective value of instantaneous voltage or an instantaneous power component of instantaneous voltage.

[0113] S304, using an adaptive multi-scale peak value detection algorithm to extract peak and valley time points from the data of instantaneous voltage.

[0114] S305, determining a resonant protection parameter of the target node according to the peak and valley time points.

[0115] The resonant protection parameter comprises at least one of the following: an oscillation frequency, an instantaneous voltage oscillation amplitude, an inter-harmonic voltage content rate, an oscillation power absolute value, an oscillation power per unit value, and an oscillation power effective value.

[0116] ​S306, if any of the resonance protection parameters exceeds the corresponding resonance protection threshold, it is determined that the target node enters a synchronous resonance state.

[0117] S307, in response to the synchronous resonance state, triggering a resonance protection action on the target node.

[0118] The resonance protection method provided by the embodiments of the present application acquires the voltage and current data of the target node of the power system to be measured; determines the inter-harmonic set and the inter-harmonic subset from the voltage and current data; if the root mean square values of the inter-harmonic set and the inter-harmonic subset meet the triggering condition of the resonance protection, uses the adaptive multi-scale peak detection algorithm to extract the peak and valley time of the voltage from the voltage and current data; determines the resonance protection parameters of the target node according to the peak and valley time; and performs resonance protection on the target node according to the resonance protection parameters. Since the resonance protection is triggered in combination with the root mean square values of the inter-harmonic set and the inter-harmonic subset, false judgments caused by spectrum leakage are effectively avoided. Moreover, the adaptive multi-scale peak detection algorithm is used to determine the peak and valley time of the voltage, so as to determine the resonance protection parameters, realize accurate extraction of local extreme points in the signal under multi-scale, overcome the false detection problem caused by improper window length selection and noise interference, and thus improve the anti-interference ability.

[0119] It should be understood that, although each step in the flowchart involved in the above embodiments is displayed in sequence according to the arrow, these steps are not necessarily executed in sequence according to the arrow. Unless otherwise specified herein, the execution of these steps is not strictly limited in sequence, and these steps can be executed in other sequences. Moreover, at least part of the steps in the flowchart involved in the above embodiments can include multiple steps or multiple stages, which are not necessarily executed at the same time, but can be executed at different times, and the execution sequence of these steps or stages is not necessarily sequential, but can be executed in rotation or alternation with at least part of other steps or steps or stages in other steps.

[0120] Based on the same inventive concept, the embodiments of the present application also provide a resonance protection device for implementing the resonance protection method described above. The implementation scheme for solving the problem provided by the device is similar to the implementation scheme described in the above method, so the specific limitations in one or more resonance protection device embodiments provided below can refer to the limitations of the resonance protection method described above, which will not be described here.

[0121] In one exemplary embodiment, as shown in Figure 16 a resonance protection device 400 is provided, which includes an acquisition module 401, a triggering module 402, a determination module 403 and a protection module 404, wherein:

[0122] The acquisition module 401 is configured to acquire voltage and current data of a target node of the power system to be tested; and determine an inter-harmonic set and an inter-harmonic subset from the voltage and current data.

[0123] The triggering module 402 is configured to, if a root mean square value of the inter-harmonic set and the inter-harmonic subset meets a triggering condition of the resonance protection, extract peak and valley time points of voltage from the voltage and current data by using an adaptive multi-scale peak detection algorithm.

[0124] The determination module 403 is configured to determine a resonance protection parameter of the target node according to the peak and valley time points.

[0125] The protection module 404 is configured to perform resonance protection on the target node according to the resonance protection parameter.

[0126] In one of the embodiments, the triggering condition of the resonance protection includes that a root mean square value of the inter-harmonic subset is greater than a root mean square threshold, and a ratio of the root mean square value of the inter-harmonic subset to a root mean square value of the inter-harmonic set is greater than a ratio threshold.

[0127] In one of the embodiments, the triggering module 402 is further configured to determine, from the voltage and current data, data of instantaneous voltage corresponding to a triggering time point of the resonance protection; and extract the peak and valley time points from the data of the instantaneous voltage by using the adaptive multi-scale peak detection algorithm.

[0128] In one of the embodiments, the data of the instantaneous voltage includes an effective value of the instantaneous voltage or an instantaneous power component of the instantaneous voltage.

[0129] In one of the embodiments, the triggering module 402 is further configured to determine that the target node enters a synchronous resonance state if any resonance protection parameter exceeds a corresponding resonance protection threshold; and trigger a resonance protection action on the target node in response to the synchronous resonance state.

[0130] In one of the embodiments, the resonance protection parameter includes at least one of the following: an oscillation frequency, an oscillation amplitude of the instantaneous voltage, an inter-harmonic voltage content rate, an oscillation power absolute value, an oscillation power per unit value, and an oscillation power effective value.

[0131] The modules in the resonance protection device described above can be all or partially implemented by software, hardware, or a combination thereof. The modules described above can be embedded in or independent of a processor in a computer device in a hardware form, or stored in a memory in a computer device in a software form, so as to be called and executed by a processor to perform operations corresponding to the modules.

[0132] In one exemplary embodiment, a computer device is provided, which can be a server, and an internal structure diagram of the computer device can be as shown in Figure 17As shown in the figure. The computer device includes a processor, a memory, an input / output interface (Input / Output, referred to as I / O) and a communication interface. Among them, the processor, the memory and the input / output interface are connected through the system bus, and the communication interface is connected to the system bus through the input / output interface. Among them, the processor of the computer device is used to provide computing and control capability. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The database of the computer device is used to store data. The input / output interface of the computer device is used to exchange information between the processor and the external device. The communication interface of the computer device is used to communicate with the terminal outside through the network connection. The computer program is executed by the processor to implement a resonance protection method.

[0133] Those skilled in the art can understand that, Figure 17 The structure shown in the figure is only a block diagram of part of the structure related to the scheme of the present application, and does not constitute a limitation on the computer device to which the scheme of the present application is applied. The specific computer device can include more or less components than those shown in the figure, or combine certain components, or have a different component arrangement.

[0134] In one exemplary embodiment, a computer device is provided, including a memory and a processor, the memory storing a computer program, and the processor executing the computer program to implement the resonance protection method described above.

[0135] In one embodiment, a computer readable storage medium is provided, which stores a computer program, and the computer program is executed by the processor to implement the resonance protection method described above.

[0136] In one embodiment, a computer program product is provided, including a computer program, and the computer program is executed by the processor to implement the resonance protection method described above.

[0137] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by a computer program instructing relevant hardware. The computer program can be stored in a non-volatile computer readable storage medium. When the computer program is executed, the processes of the above-mentioned embodiment methods can be included. Any reference to memory, database or other medium used in the embodiments provided in the present application can include at least one of non-volatile memory and volatile memory. The non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical storage, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetoresistive random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. The volatile memory can include random access memory (RAM) or external cache memory, etc. As an illustration but not limitation, the RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM), etc. The database involved in the embodiments provided in the present application can include at least one of a relational database and a non-relational database. The non-relational database can include a distributed database based on a block chain, etc., without being limited thereto. The processor involved in the embodiments provided in the present application can be a general-purpose processor, a central processing unit, a graphics processing unit, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, an artificial intelligence (AI) processor, etc., without being limited thereto.

[0138] The technical features of the above embodiments can be combined arbitrarily. In order to make the description simple, all possible combinations of the technical features in the above embodiments are not described, however, as long as the combinations of the technical features do not exist contradictory, it should be considered as the scope of the present application.

[0139] The above embodiments only express several implementation ways of the present application, and the description is specific and detailed, but it should not be understood as a limitation to the patent scope of the present application. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the present application, several modifications and improvements can be made, which all belong to the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the appended claims.

Claims

1. A resonance protection method, characterized in that: The method comprises: Obtaining voltage and current data of a target node of the power system to be tested; Determining root mean square values ​​of interharmonic sets and interharmonic subsets from the voltage and current data; If the root mean square values ​​of the interharmonic set and the interharmonic subset meet the triggering condition of the resonance protection, an adaptive multi-scale peak detection algorithm is used to extract the peak and valley moments of the voltage from the voltage and current data; determining a resonance protection parameter of the target node according to the peak and valley moments; Resonance protection is performed on the target node according to the resonance protection parameter.

2. The method according to claim 1, characterized in that The triggering condition for the resonance protection includes that the root mean square value of the interharmonic subset is greater than a root mean square threshold, and the ratio of the root mean square value of the interharmonic subset to the root mean square value of the interharmonic set is greater than a ratio threshold.

3. The method according to claim 1, characterized in that The method of using an adaptive multi-scale peak detection algorithm to extract the peak and valley moments of voltage from the voltage and current data includes: Determining the instantaneous voltage data corresponding to the triggering moment of the resonance protection from the voltage and current data; The peak and valley moments are extracted from the instantaneous voltage data using the adaptive multi-scale peak detection algorithm.

4. The method according to claim 3, characterized in that The instantaneous voltage data includes an effective value of the instantaneous voltage or an instantaneous power component of the instantaneous voltage.

5. The method according to claim 1, wherein The performing resonance protection on the target node according to the resonance protection parameter includes: If any resonance protection parameter exceeds the corresponding resonance protection threshold, determining that the target node enters a synchronous resonance state; In response to the synchronous resonance state, a resonance protection action is triggered for the target node.

6. The method according to any one of claims 1 to 5, characterized in that The resonance protection parameter includes at least one of the following: oscillation frequency, instantaneous voltage oscillation amplitude, interharmonic voltage content rate, oscillation power absolute value, oscillation power per unit value, and oscillation power effective value.

7. A resonance protection device, characterized in that: The device comprises: An acquisition module is configured to acquire voltage and current data of a target node of the power system to be measured; and determine the root mean square value of an interharmonic set and an interharmonic subset from the voltage and current data; a trigger module, configured to extract voltage peak and valley moments from the voltage and current data using an adaptive multi-scale peak detection algorithm if the root mean square values ​​of the interharmonic set and the interharmonic subset meet a trigger condition for resonance protection; a determination module, configured to determine a resonance protection parameter of the target node according to the peak and valley moments; A protection module is configured to perform resonance protection on the target node according to the resonance protection parameter.

8. A computer device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 6 are implemented.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 6 are implemented.

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

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