Amplitude-frequency modulation signal determination method, device and equipment based on phase-locked loop

Abstract

The invention provides an amplitude-frequency modulation signal determination method, device and equipment based on a phase-locked loop, relates to the technical field of electric power, and is used for determining an amplitude-frequency modulation signal so as to extract oscillation information. The method comprises the following steps: acquiring a system power frequency and a signal frequency of an amplitude-frequency modulation signal; based on the signal frequency, extracting an amplitude modulation signal; determining an amplitude modulation index of the amplitude-frequency modulation signal based on the amplitude modulation signal, and generating an initial frequency modulation signal; determining a frequency modulation index of the amplitude-frequency modulation signal based on the system power frequency and the initial frequency modulation signal; and determining an amplitude-frequency modulation signal based on the signal frequency, the amplitude modulation index and the frequency modulation index.

Description

Technical Field

[0001] The present invention relates to the field of electric power technology, and in particular to a method, device and equipment for determining an amplitude-frequency modulation signal based on a phase-locked loop. Background Art

[0002] With the continuous development of power grid technology, the grid connection of electronic power equipment is becoming more and more common. This process can improve energy utilization efficiency and system power conversion flexibility. However, the high proportion of power electronic equipment connected to the grid also causes multi-characteristic oscillation problems. The existence of oscillations will lead to unstable operation of the power system and reduced equipment safety.

[0003] In order to solve the oscillation problem, it is crucial to accurately extract the oscillation information. However, the traditional extraction and analysis methods are too inaccurate to obtain effective oscillation information. Relevant theories show that oscillation originates from amplitude-frequency modulated signals, and more accurate oscillation information can be obtained through amplitude-frequency modulated signals. However, how to determine the amplitude-frequency modulated signal is still a problem that needs to be solved. Summary of the invention

[0004] In response to the problems in the related art, the present application provides a method, device and equipment for determining an amplitude-frequency modulated signal based on a phase-locked loop, which are used to determine the amplitude-frequency modulated signal so as to extract oscillation information.

[0005] To solve the above problems, this application provides the following technical solutions:

[0006] In a first aspect, the present application provides a method for determining an amplitude-frequency modulation signal based on a phase-locked loop, comprising:

[0007] Obtain the signal frequency of the system power frequency and amplitude-frequency modulation signal;

[0008] Extracting the amplitude modulation signal based on the signal frequency;

[0009] Based on the amplitude modulation signal, determining the amplitude modulation index of the amplitude frequency modulation signal, and generating an initial frequency modulation signal;

[0010] Determine the frequency modulation index of the amplitude-frequency modulation signal based on the system power frequency and the initial frequency modulation signal;

[0011] An amplitude-frequency modulation signal is determined based on the signal frequency, the amplitude modulation index, and the frequency modulation index.

[0012] Further, based on the system power frequency and the initial frequency modulation signal, the frequency modulation index of the amplitude-frequency modulation signal is determined, including:

[0013] Based on the system power frequency, adjust the rotation speed of the coordinate system to a first rotation speed;

[0014] At a first rotation speed, determining a frequency modulation signal based on the initial frequency modulation signal;

[0015] Based on the frequency modulated signal, a frequency modulation index of the amplitude frequency modulated signal is determined.

[0016] Further, based on the frequency modulation signal, determining the frequency modulation index of the amplitude frequency modulation signal includes:

[0017] Performing trigonometric transformation on the frequency modulated signal to determine the trigonometric function of the frequency modulated signal;

[0018] Perform FFT analysis on the trigonometric functions to determine the frequency modulation index.

[0019] Further, based on the amplitude modulation signal, an amplitude modulation index is determined, and an initial frequency modulation signal is generated, including:

[0020] Perform FFT analysis on the amplitude modulated signal to determine the amplitude modulation index of the amplitude-frequency modulated signal;

[0021] Extracting amplitude-frequency modulated signals;

[0022] An initial frequency modulation signal is generated based on the amplitude frequency modulation signal and the amplitude modulation signal.

[0023] Further, based on the signal frequency, the amplitude modulation signal is extracted, including:

[0024] Based on the signal frequency, adjusting the rotation speed of the coordinate system to a second rotation speed;

[0025] At the second rotation speed, the amplitude modulation signal is extracted.

[0026] Furthermore, the signal frequency of the amplitude-frequency modulation signal and the system power frequency are obtained, including:

[0027] Get the initial rotation speed of the coordinate system;

[0028] Perform FFT analysis on the initial rotation speed to determine the signal frequency of the amplitude-frequency modulation signal and the system power frequency.

[0029] In a second aspect, the present application provides a phase-locked loop-based amplitude-frequency modulation signal determination device, comprising:

[0030] An acquisition module, used to acquire the signal frequency of the system power frequency and amplitude-frequency modulation signal;

[0031] An extraction module, used for extracting an amplitude modulated signal based on a signal frequency;

[0032] A processing module, used for determining an amplitude modulation index of an amplitude-frequency modulation signal based on the amplitude modulation signal, and generating an initial frequency modulation signal;

[0033] A frequency modulation determination module, used to determine the frequency modulation index of the amplitude frequency modulation signal based on the system power frequency and the initial frequency modulation signal;

[0034] The signal determination module is used to determine the amplitude-frequency modulation signal based on the signal frequency, the amplitude modulation index, and the frequency modulation index.

[0035] Furthermore, the frequency modulation determination module is specifically used for:

[0036] Based on the system power frequency, adjust the rotation speed of the coordinate system to a first rotation speed;

[0037] At a first rotation speed, determining a frequency modulation signal based on the initial frequency modulation signal;

[0038] Based on the frequency modulated signal, a frequency modulation index of the amplitude frequency modulated signal is determined.

[0039] Furthermore, the frequency modulation determination module is specifically used for:

[0040] Performing trigonometric transformation on the frequency modulated signal to determine the trigonometric function of the frequency modulated signal;

[0041] Perform FFT analysis on the trigonometric functions to determine the frequency modulation index.

[0042] Furthermore, the processing module is specifically used for:

[0043] Perform FFT analysis on the amplitude modulated signal to determine the amplitude modulation index of the amplitude-frequency modulated signal;

[0044] Extracting amplitude-frequency modulated signals;

[0045] An initial frequency modulation signal is generated based on the amplitude frequency modulation signal and the amplitude modulation signal.

[0046] Furthermore, the extraction module is specifically used for:

[0047] Based on the signal frequency, adjusting the rotation speed of the coordinate system to a second rotation speed;

[0048] At the second rotation speed, the amplitude modulation signal is extracted.

[0049] Furthermore, the acquisition module is specifically used for:

[0050] Get the initial rotation speed of the coordinate system;

[0051] Perform FFT analysis on the initial rotation speed to determine the signal frequency of the amplitude-frequency modulation signal and the system power frequency.

[0052] In a third aspect, the present application provides an electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the phase-locked loop-based amplitude-frequency modulation signal determination method when executing the program.

[0053] In a fourth aspect, the present application provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the above-mentioned phase-locked loop-based amplitude-frequency modulation signal determination method.

[0054] In a fifth aspect, the present application provides a computer program product, including a computer program / instruction, which, when executed by a processor, implements the steps of the above-mentioned phase-locked loop-based amplitude-frequency modulation signal determination method.

[0055] In the technical solution provided by the present application, the amplitude modulation signal and the frequency modulation signal are extracted by extracting the system power frequency and the frequency of the amplitude-frequency modulation signal. Then, the amplitude modulation index and the frequency modulation index of the amplitude-frequency modulation signal are determined according to the amplitude modulation signal and the frequency modulation signal, and finally, based on the above parameters, the amplitude-frequency modulation signal is determined, so as to measure and analyze the amplitude-frequency modulation signal to obtain more accurate oscillation information. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0057] Figure 1 A schematic diagram of a flow chart of a method for determining an amplitude-frequency modulation signal based on a phase-locked loop provided in an embodiment of the present application;

[0058] Figure 2 A schematic flow chart of another method for determining an amplitude-frequency modulation signal based on a phase-locked loop provided in an embodiment of the present application;

[0059] Figure 3 A schematic flow chart of another method for determining an amplitude-frequency modulation signal based on a phase-locked loop provided in an embodiment of the present application;

[0060] Figure 4 A schematic flow chart of another method for determining an amplitude-frequency modulation signal based on a phase-locked loop provided in an embodiment of the present application;

[0061] Figure 5 A schematic flow chart of another method for determining an amplitude-frequency modulation signal based on a phase-locked loop provided in an embodiment of the present application;

[0062] Figure 6 A schematic flow chart of another method for determining an amplitude-frequency modulation signal based on a phase-locked loop provided in an embodiment of the present application;

[0063] Figure 7An overall flow chart of another method for determining an amplitude-frequency modulation signal based on a phase-locked loop provided in an embodiment of the present application;

[0064] Figure 8 A schematic diagram of a simulation result provided in an embodiment of the present application;

[0065] Fig. 9 A schematic diagram of another simulation result provided in an embodiment of the present application;

[0066] Fig.10 A schematic diagram of another simulation result provided in an embodiment of the present application;

[0067] Fig.11 A schematic diagram of another simulation result provided in an embodiment of the present application;

[0068] Fig.12 A schematic diagram of the structure of a phase-locked loop-based amplitude-frequency modulation signal determination device provided in an embodiment of the present application;

[0069] Fig.13 A schematic diagram of the structure of a computer device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0070] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0071] It should be noted that the method, device and equipment for determining an amplitude-frequency modulated signal based on a phase-locked loop provided in the present application can be used in the field of power technology, and can also be used in any field outside the field of power technology. The application field of the method, device and equipment for determining an amplitude-frequency modulated signal based on a phase-locked loop provided in the present application is not limited.

[0072] Driven by the global new energy revolution, the continuous development of power grid technology, the high proportion of new energy equipment and high proportion of power electronic equipment connected to the grid are becoming more and more common. This process can improve the energy utilization efficiency and the flexibility of system power conversion. However, the high proportion of power electronic equipment connected to the grid also causes multi-characteristic oscillation problems.

[0073] It can be seen that the broadband oscillation design of the power system in multiple regions and multiple electrical equipment has become an important challenge affecting the safe and stable operation of electrical equipment and power systems. Accurate description of oscillation information (such as data, waveform) is the premise of oscillation analysis and suppression. However, the traditional extraction and analysis methods are too inaccurate to obtain effective oscillation information. Relevant theories show that oscillations originate from amplitude-frequency modulated signals, and more accurate oscillation information can be obtained through amplitude-frequency modulated signals. However, how to determine the amplitude-frequency modulated signal is still a problem that needs to be solved.

[0074] Based on this, the present application provides a method, device and apparatus for determining an amplitude-frequency modulation signal based on a phase-locked loop, which can determine the amplitude-frequency modulation signal by acquiring the frequency, frequency modulation parameters, amplitude modulation index, etc. of the amplitude-frequency modulation signal, so as to extract oscillation information.

[0075] In order to facilitate the understanding of the technical solution provided by this application, the technical terms appearing in this application are introduced as follows:

[0076] Amplitude modulated signals are signals whose amplitude changes while the frequency remains constant. The amplitude of such signals is modulated to facilitate the transmission or processing of information. In power systems, amplitude modulated signals can be used to describe voltage or current changes in the power grid.

[0077] A frequency modulated signal is a signal whose frequency changes while its amplitude remains unchanged. The frequency of this signal is modulated to facilitate the transmission or processing of information. In power systems, frequency modulated signals can be used to describe frequency changes in the power grid.

[0078] Amplitude-frequency modulated signals, also described as amplitude-frequency modulated signals, are signals whose amplitude and frequency change simultaneously. They are a combination of amplitude-modulated signals and frequency-modulated signals. Both the amplitude and frequency of such signals are modulated to facilitate the transmission or processing of information. In power systems, amplitude-frequency modulated signals can be used to describe oscillation phenomena in power grids.

[0079] A phase-locked loop (PLL) is a circuit design that is widely used in communication systems, signal processing, and control systems. Its main function is to establish a stable phase relationship between the input signal and the output signal, thereby achieving frequency locking and phase tracking.

[0080] It should be noted that in the dq coordinate system, under the action of the amplitude and frequency co-modulation signal, when the coordinate system rotates at different speeds, the amplitude modulation signal and the frequency modulation signal can be extracted, and the relevant parameters of the amplitude-frequency modulation signal are obtained in combination with the PLL technology to determine the amplitude-frequency modulation signal. This application is implemented based on this technical idea.

[0081] Figure 1 A flow chart of a method for determining an amplitude-frequency modulation signal based on a phase-locked loop provided in an embodiment of the present application is shown in FIG. Figure 1 As shown, the specific steps include:

[0082] S101, obtaining the signal frequencies of the system power frequency and the amplitude-frequency modulation signal.

[0083] S102: extracting an amplitude modulation signal based on the signal frequency.

[0084] S103 . Determine an amplitude modulation index of an amplitude-frequency modulation signal based on the amplitude modulation signal, and generate an initial frequency modulation signal.

[0085] S104: Determine a frequency modulation index of the amplitude-frequency modulation signal based on the system power frequency and the initial frequency modulation signal.

[0086] S105 . Determine an amplitude-frequency modulation signal based on the signal frequency, the amplitude modulation index, and the frequency modulation index.

[0087] In the technical solution provided by the present application, the amplitude modulation signal and the frequency modulation signal are extracted by extracting the system power frequency and the frequency of the amplitude-frequency modulation signal. Then, the amplitude modulation index and the frequency modulation index of the amplitude-frequency modulation signal are determined according to the amplitude modulation signal and the frequency modulation signal, and finally, based on the above parameters, the amplitude-frequency modulation signal is determined, so as to measure and analyze the amplitude-frequency modulation signal to obtain more accurate oscillation information.

[0088] S101, obtaining the signal frequencies of the system power frequency and the amplitude-frequency modulation signal.

[0089] Among them, the system power frequency is the rated frequency in the power system, and the initial speed of the dq coordinate system is the signal frequency of the frequency modulation signal superimposed on the system power frequency. These two parameters can be directly obtained.

[0090] S102: extracting an amplitude modulation signal based on the signal frequency.

[0091] Exemplarily, the rotation speed of the dq coordinate system can be adjusted based on the signal frequency, and the amplitude modulation signal can be directly extracted based on the PLL technology.

[0092] S103 . Determine an amplitude modulation index of an amplitude-frequency modulation signal based on the amplitude modulation signal, and generate an initial frequency modulation signal.

[0093] It can be understood that only the amplitude of the amplitude modulated signal changes. Therefore, after the amplitude modulated signal is acquired, the amplitude modulation index of the amplitude modulated signal, that is, the amplitude modulation index of the amplitude-frequency modulated signal, can be determined based on the amplitude modulated signal.

[0094] S104: Determine a frequency modulation index of the amplitude-frequency modulation signal based on the system power frequency and the initial frequency modulation signal.

[0095] The initial frequency signal is an alternating current signal with only frequency modulation, and it is impossible to directly analyze it to determine its frequency modulation index. Therefore, it is necessary to first convert the initial frequency modulation signal into an amplitude frequency modulation signal, and then further determine the frequency modulation index.

[0096] S105 . Determine an amplitude-frequency modulation signal based on the signal frequency, the amplitude modulation index, and the frequency modulation index.

[0097] In some embodiments, the amplitude-frequency modulation signal may be determined based on the signal frequency, the amplitude modulation index, the frequency modulation index, and a signal model of the amplitude-frequency modulation signal.

[0098] For example, the analytical expression of the amplitude-frequency modulation excitation rectangular coordinate system is as follows:

[0099]

[0100] In the above expression, a1 is the frequency modulation signal, ω0 is the system power frequency, ω1 is the signal frequency of the amplitude-frequency modulation signal, is the initial phase of the amplitude modulated signal, is the initial phase of the frequency modulation signal, U0 is the initial voltage of the node, A1 is the frequency modulation index, and U1 is the amplitude modulation index.

[0101] It can be understood that the present application is based on PLL technology and dq coordinate system. Therefore, based on the above formula, the formula of the amplitude-frequency modulated signal in the dq coordinate system is determined, that is, the signal model of the amplitude-frequency modulated signal, which is specifically shown as follows:

[0102]

[0103] Where ω1 is the signal frequency of the amplitude-frequency modulation signal, is the initial phase of the amplitude modulated signal, is the initial phase of the frequency modulated signal, U0 is the initial voltage of the node, A1 is the frequency modulation index, and U1 is the amplitude modulation index. It can be understood that the initial phase of the amplitude modulated signal and the initial phase of the frequency modulated signal are basic parameters of the signal and can be directly obtained. Therefore, according to the signal frequency, amplitude modulation index, and frequency modulation index, combined with the above signal model, the amplitude-frequency modulated signal can be directly determined.

[0104] In some embodiments, Figure 2 As shown, obtaining the signal frequency of the system power frequency and the amplitude-frequency modulation signal can be specifically implemented as follows:

[0105] S201, obtaining the initial rotation speed of the coordinate system.

[0106] It should be noted that under the initial PLL parameters, the signal frequencies of the amplitude-frequency modulation signal and the frequency modulation signal are consistent. The initial rotation speed of the dq coordinate system is the signal frequency of the frequency modulation signal superimposed on the system power frequency, where the system power frequency is the rated frequency in the power system. Therefore, as long as the initial rotation speed of the coordinate system is obtained, the signal frequency of the frequency modulation signal can be determined, that is, the signal frequency of the amplitude-frequency modulation signal.

[0107] Exemplarily, under the initial PLL parameters, the initial rotation speed of the dq coordinate system can be determined by measuring the initial PLL parameters. For example, the initial rotation speed of the dq coordinate system under the initial PLL parameters is determined based on the PLL gain, the time constant of the loop filter, etc.

[0108] S202, performing FFT analysis on the initial rotation speed to determine the signal frequency of the amplitude-frequency modulation signal and the system power frequency.

[0109] Exemplarily, an FFT analysis is performed on the initial speed to obtain component information in the initial speed. For example, an FFT analysis is performed on the initial speed to obtain the system power frequency, signal frequency, and frequency modulation index of the frequency modulated signal. It should be noted that under the initial PLL parameters, the frequency modulation index obtained is not accurate and needs to be measured separately. Only the signal frequency of the frequency modulated signal, that is, the signal frequency of the amplitude-frequency modulated signal, needs to be obtained.

[0110] In this way, by acquiring the initial rotation speed of the dq coordinate system under the initial FLL parameters and performing FFT analysis thereon, the signal frequency of the amplitude-frequency modulated signal can be determined, thereby improving the accuracy of determining the amplitude-frequency modulated signal.

[0111] In some embodiments, Figure 3 As shown, obtaining the signal frequency of the system power frequency and the amplitude-frequency modulation signal can be specifically implemented as follows:

[0112] S301. Adjust the rotation speed of the coordinate system to a second rotation speed based on the signal frequency.

[0113] Exemplarily, the rotation speed of the dq coordinate system is updated to a second rotation speed based on the signal frequency, so that the dq coordinate system is rotated at the second rotation speed to transform the coordinates, so as to update the PLL parameters. The second rotation speed is presented by the following formula:

[0114]

[0115] Among them, ω is the second speed, A1 is the frequency modulation index, ω1 is the signal frequency, is the initial phase of the amplitude modulation signal, and ω0 is the system power frequency.

[0116] S302: extracting an amplitude modulation signal at a second rotation speed.

[0117] It should be noted that when the dq coordinate system is at the second rotation speed, the frequency modulation component in the signal can be offset. Therefore, at the second rotation speed, the amplitude modulation signal can be extracted.

[0118] In this way, by adjusting the rotation speed of the dq coordinate system to the second rotation speed to offset the frequency modulation component in the signal, the amplitude modulation signal is accurately extracted, thereby improving the accuracy of determining the amplitude-frequency modulation signal.

[0119] In some embodiments, Figure 4 As shown, based on the amplitude modulation signal, determining the amplitude modulation index of the amplitude-frequency modulation signal and generating an initial frequency modulation signal can be specifically implemented as the following steps:

[0120] S401, performing FFT analysis on the amplitude modulation signal to determine the amplitude modulation index of the amplitude-frequency modulation signal.

[0121] Exemplarily, performing FFT analysis on the amplitude modulated signal can convert the time domain signal into a frequency domain signal, thereby determining the amplitudes of different frequency components in the amplitude modulated signal (such as sideband frequency, carrier frequency), and then calculating the amplitude modulation index based on the amplitude of the sideband frequency.

[0122] S402: Extract the amplitude-frequency modulated signal.

[0123] Based on PLL technology, the amplitude-frequency modulated signal in the dq coordinate system is extracted.

[0124] S403: Generate an initial frequency modulation signal based on the amplitude-frequency modulation signal and the amplitude modulation signal.

[0125] Exemplarily, the amplitude-frequency modulated signal is divided by the amplitude modulated signal to separate the frequency modulated component in the signal, thereby obtaining an alternating current signal with only frequency modulation, that is, an initial frequency modulated signal.

[0126] In some embodiments, Figure 5 As shown, the frequency modulation index of the amplitude-frequency modulation signal is determined based on the system power frequency and the initial frequency modulation signal, which can be specifically implemented as the following steps:

[0127] S501. Based on the system power frequency, adjust the rotation speed of the coordinate system to a first rotation speed.

[0128] Exemplarily, the first rotational speed is a fixed rotational speed, and its rotational speed magnitude is the system power frequency, that is, the rotational speed of the dq coordinate system is adjusted to the system power frequency magnitude.

[0129] S502: At a first rotation speed, determine a frequency modulation signal based on an initial frequency modulation signal.

[0130] It should be noted that the initial frequency modulation signal is an alternating current signal with only frequency modulation, and the corresponding signal parameters cannot be directly obtained from it. Therefore, it is necessary to adjust the rotation speed of the dq coordinate system to the first rotation speed to convert the initial frequency modulation signal into a frequency modulation signal.

[0131] S503: Determine a frequency modulation index of the amplitude-frequency modulation signal based on the frequency modulation signal.

[0132] In some embodiments, Figure 6 As shown, based on the frequency modulation signal, determining the frequency modulation index of the amplitude frequency modulation signal can be specifically implemented as follows:

[0133] S601 . Perform trigonometric transformation on a frequency modulated signal to determine a trigonometric function of the frequency modulated signal.

[0134] Exemplarily, the frequency modulated signal is subjected to inverse trigonometric transformation or approximation processing to obtain a trigonometric function of the frequency modulated signal.

[0135] S602: Perform FFT analysis on the trigonometric function to determine the frequency modulation index.

[0136] Exemplarily, FFT analysis is performed on the trigonometric function to determine a plurality of information including the frequency modulation index carried in the trigonometric function, so as to determine the frequency modulation index.

[0137] In this way, by extracting the system power frequency and the frequency of the amplitude-frequency modulation signal, the amplitude modulation signal and the frequency modulation signal are extracted respectively. Then, the amplitude modulation index and the frequency modulation index of the amplitude-frequency modulation signal are determined respectively according to the amplitude modulation signal and the frequency modulation signal, and finally, based on the above parameters, the amplitude-frequency modulation signal is determined, so as to measure and analyze the amplitude-frequency modulation signal and obtain more accurate oscillation information.

[0138] like Figure 7 As shown, it is an overall flow chart of a method for determining an amplitude-frequency modulation signal based on a phase-locked loop provided in an embodiment of the present application. The specific content can be referred to the relevant description above, and the present application will not elaborate on it here.

[0139] In some embodiments, a simulation model is built through Matlab or Simulink, and the amplitude of the data and the decomposition effect of the frequency modulation signal are verified based on typical working conditions in the model to verify the relevant contents of the technical solution provided in this application.

[0140] For example, the oscillation voltage amplitude and instantaneous value are measured with the measured value, and the result is as follows: Figure 8 and Fig. 9 As shown. Figure 8 The voltage amplitude waveform in is processed by FFT, and the result is as follows Fig.10 Similarly, Fig. 9 The waveform in the FFT process is clearly displayed Fig. 9 The fit between the instantaneous value of the oscillation and the measured value is shown in the following figure. Fig.11 shown.

[0141] like Fig.10 As shown in the figure, the waveform contains not only 7.4Hz harmonics but also 300.6Hz high-order harmonics. It can also be seen that the oscillation amplitude of the voltage is 3.45kV. Fig.11 As shown, Fig.11 This reflects that the instantaneous value of the oscillation voltage and the measured value have a good degree of fit, which directly proves the accuracy of the technical solution provided in this application.

[0142] It is worth noting that the information collected in this application is information and data authorized by the user or fully authorized by all parties, and the collection, storage, use, processing, transmission, provision, disclosure and application of relevant data comply with the relevant laws, regulations and standards of relevant countries and regions, take necessary confidentiality measures, do not violate public order and good customs, and provide corresponding operation entrances for users to choose to authorize or refuse.

[0143] It is worth noting that the technical solution provided in this application provides users with corresponding operation entrances for them to choose to agree or reject the automated decision-making results; if the user chooses to reject, the expert decision-making process will be entered.

[0144] Fig.12 Schematic diagram of the structure of a phase-locked loop-based amplitude-frequency modulation signal determination device provided in an embodiment of the present application, the device is used to execute the above-mentioned phase-locked loop-based amplitude-frequency modulation signal determination method, such as Fig.12 As shown, the phase-locked loop-based amplitude-frequency modulation signal determination device includes: an acquisition module 1201 , an extraction module 1202 , a processing module 1203 , a frequency modulation determination module 1204 and a signal determination module 1205 .

[0145] An acquisition module 1201 is used to acquire the signal frequency of the system power frequency and the amplitude-frequency modulation signal;

[0146] An extraction module 1202, configured to extract an amplitude modulated signal based on a signal frequency;

[0147] The processing module 1203 is used to determine the amplitude modulation index of the amplitude-frequency modulation signal based on the amplitude modulation signal, and generate an initial frequency modulation signal;

[0148] A frequency modulation determination module 1204 is used to determine the frequency modulation index of the amplitude frequency modulation signal based on the system power frequency and the initial frequency modulation signal;

[0149] The signal determination module 1205 is used to determine the amplitude-frequency modulation signal based on the signal frequency, the amplitude modulation index, and the frequency modulation index.

[0150] Further, the frequency modulation determination module 1204 is specifically configured to:

[0151] Based on the system power frequency, adjust the rotation speed of the coordinate system to a first rotation speed;

[0152] At a first rotation speed, determining a frequency modulation signal based on the initial frequency modulation signal;

[0153] Based on the frequency modulated signal, a frequency modulation index of the amplitude frequency modulated signal is determined.

[0154] Further, the frequency modulation determination module 1204 is specifically configured to:

[0155] Performing trigonometric transformation on the frequency modulated signal to determine the trigonometric function of the frequency modulated signal;

[0156] Perform FFT analysis on the trigonometric functions to determine the frequency modulation index.

[0157] Further, the processing module 1203 is specifically configured to:

[0158] Perform FFT analysis on the amplitude modulated signal to determine the amplitude modulation index of the amplitude-frequency modulated signal;

[0159] Extracting amplitude-frequency modulated signals;

[0160] An initial frequency modulation signal is generated based on the amplitude frequency modulation signal and the amplitude modulation signal.

[0161] Furthermore, the extraction module 1202 is specifically configured to:

[0162] Based on the signal frequency, adjusting the rotation speed of the coordinate system to a second rotation speed;

[0163] At the second rotation speed, the amplitude modulation signal is extracted.

[0164] Furthermore, the acquisition module 1201 is specifically used for:

[0165] Get the initial rotation speed of the coordinate system;

[0166] Perform FFT analysis on the initial rotation speed to determine the signal frequency of the amplitude-frequency modulation signal and the system power frequency.

[0167] In the technical solution provided by the present application, the amplitude modulation signal and the frequency modulation signal are extracted by extracting the system power frequency and the frequency of the amplitude-frequency modulation signal. Then, the amplitude modulation index and the frequency modulation index of the amplitude-frequency modulation signal are determined according to the amplitude modulation signal and the frequency modulation signal, and finally, based on the above parameters, the amplitude-frequency modulation signal is determined, so as to measure and analyze the amplitude-frequency modulation signal to obtain more accurate oscillation information.

[0168] The systems, devices, modules or units described in the above embodiments may be implemented by computer chips or entities, or by products with certain functions. A typical implementation device is a computer device, and specifically, the computer device may be, for example, a personal computer, a laptop computer, a cellular phone, a camera phone, a smart phone, a personal digital assistant, a media player, a navigation device, an email device, a game console, a tablet computer, a wearable device, or a combination of any of these devices.

[0169] An embodiment of the present invention provides a computer device, including a memory and a processor, wherein the memory is used to store information including program instructions, and the processor is used to control the execution of the program instructions. When the program instructions are loaded and executed by the processor, the steps of the embodiment of the above-mentioned method for determining an amplitude-frequency modulation signal based on a phase-locked loop are implemented. For a specific description, please refer to the embodiment of the above-mentioned method for determining an amplitude-frequency modulation signal based on a phase-locked loop.

[0170] Reference below Fig.13 , which shows a schematic diagram of the structure of a computer device 1300 suitable for implementing an embodiment of the present application.

[0171] like Fig.13 As shown, the computer device 1300 includes a central processing unit (CPU) 1301, which can perform various appropriate operations and processes according to a program stored in a read-only memory (ROM) 1302 or a program loaded from a storage part 13013 into a random access memory (RAM) 1303. In the RAM 1303, various programs and data required for the operation of the computer device 1300 are also stored. The CPU 1301, the ROM 1302, and the RAM 1303 are connected to each other via a bus 1304. An input / output (I / O) interface 1305 is also connected to the bus 1304.

[0172] The following components are connected to the I / O interface 1305: an input section 1306 including a keyboard, a mouse, etc.; an output section 1307 including a cathode ray tube (CRT), a liquid crystal feedback device (LCD), etc., and a speaker, etc.; a storage section 1308 including a hard disk, etc.; and a communication section 1309 including a network interface card such as a LAN card, a modem, etc. The communication section 1309 performs communication processing via a network such as the Internet. A drive 1310 is also connected to the I / O interface 1305 as needed. A removable medium 1311, such as a magnetic disk, an optical disk, a magneto-optical disk, a semiconductor memory, etc., is installed on the drive 1310 as needed, so that a computer program read therefrom is installed as needed as the storage section 1308.

[0173] In particular, according to an embodiment of the present invention, the process described above with reference to the flowchart can be implemented as a computer software program. For example, an embodiment of the present invention includes a computer program product, which includes a computer program tangibly contained on a machine-readable medium, and the computer program includes program code for executing the method shown in the flowchart. In such an embodiment, the computer program can be downloaded and installed from a network through the communication part 1309, and / or installed from the removable medium 1311.

[0174] Computer readable media include permanent and non-permanent, removable and non-removable media that can be implemented by any method or technology to store information. Information can be computer readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, compact disk read-only memory (CD-ROM), digital versatile disk (DVD) or other optical storage, magnetic cassettes, magnetic tape disk storage or other magnetic storage devices or any other non-transmission media that can be used to store information that can be accessed by a computing device. As defined herein, computer readable media does not include temporary computer readable media (transitory media), such as modulated data signals and carrier waves.

[0175] For the convenience of description, the above device is described in various units according to their functions. Of course, when implementing the present application, the functions of each unit can be implemented in the same or multiple software and / or hardware.

[0176] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0177] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0178] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0179] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0180] The acquisition, storage, use, and processing of data in the technical solution of this application comply with the relevant provisions of national laws and regulations.

[0181] It should be noted that in the embodiments of the present application, certain software, components, models and other existing solutions in the industry may be mentioned, and they should be regarded as exemplary. Their purpose is only to illustrate the feasibility of implementing the technical solution of the present application, but it does not mean that the applicant has or will necessarily use the solution.

[0182] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that contain computer-usable program code.

[0183] The present application may be described in the general context of computer-executable instructions executed by a computer, such as program modules. Generally, program modules include routines, programs, objects, components, data structures, etc. that perform specific tasks or implement specific abstract data types. The present application may also be practiced in distributed computing environments where tasks are performed by remote processing devices connected through a communication network. In a distributed computing environment, program modules may be located in local and remote computer storage media, including storage devices.

[0184] Each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.

[0185] The above is only an embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims

1. A method for determining an amplitude-frequency modulation signal based on a phase-locked loop, characterized in that: The method comprises: Obtain the signal frequency of the system power frequency and amplitude-frequency modulation signal; extracting an amplitude modulated signal based on the signal frequency; Based on the amplitude modulation signal, determining the amplitude modulation index of the amplitude frequency modulation signal, and generating an initial frequency modulation signal; Determining a frequency modulation index of the amplitude-frequency modulation signal based on the system power frequency and the initial frequency modulation signal; The amplitude-frequency modulation signal is determined based on the signal frequency, the amplitude modulation index, and the frequency modulation index.

2. The method according to claim 1, characterized in that The method of determining the frequency modulation index of the amplitude-frequency modulation signal based on the system power frequency and the initial frequency modulation signal includes: Based on the system power frequency, adjusting the rotation speed of the coordinate system to a first rotation speed; At a first rotation speed, determining a frequency modulation signal based on the initial frequency modulation signal; Based on the frequency modulation signal, a frequency modulation index of the amplitude frequency modulation signal is determined.

3. The method according to claim 2, characterized in that The step of determining the frequency modulation index of the amplitude-frequency modulation signal based on the frequency modulation signal comprises: Performing trigonometric transformation on the frequency modulated signal to determine a trigonometric function of the frequency modulated signal; Perform FFT analysis on the trigonometric function to determine the frequency modulation index.

4. The method according to claim 1, characterized in that: The step of determining an amplitude modulation index based on the amplitude modulation signal and generating an initial frequency modulation signal comprises: Performing FFT analysis on the amplitude modulation signal to determine the amplitude modulation index of the amplitude-frequency modulation signal; extracting the amplitude-frequency modulated signal; An initial frequency modulation signal is generated based on the amplitude frequency modulation signal and the amplitude modulation signal.

5. The method according to claim 1, characterized in that The step of extracting the amplitude modulation signal based on the signal frequency comprises: Based on the signal frequency, adjusting the rotation speed of the coordinate system to a second rotation speed; At a second rotation speed, the amplitude modulation signal is extracted.

6. The method according to claim 1, characterized in that Obtain the signal frequency and system power frequency of the amplitude-frequency modulation signal, including: Get the initial rotation speed of the coordinate system; Perform FFT analysis on the initial rotation speed to determine the signal frequency of the amplitude-frequency modulation signal and the system power frequency.

7. A device for determining an amplitude-frequency modulation signal based on a phase-locked loop, characterized in that: The device comprises: An acquisition module, used to acquire the signal frequency of the system power frequency and amplitude-frequency modulation signal; An extraction module, used for extracting an amplitude modulated signal based on the signal frequency; A processing module, configured to determine an amplitude modulation index of the amplitude-frequency modulation signal based on the amplitude modulation signal, and generate an initial frequency modulation signal; A frequency modulation determination module, used to determine the frequency modulation index of the amplitude-frequency modulation signal based on the system power frequency and the initial frequency modulation signal; A signal determination module is used to determine the amplitude-frequency modulation signal based on the signal frequency, the amplitude modulation index, and the frequency modulation index.

8. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the program, the steps of the phase-locked loop-based amplitude-frequency modulation signal determination 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 for determining an amplitude-frequency modulation signal based on a phase-locked loop as claimed in any one of claims 1 to 6 are implemented.

10. A computer program product comprising a computer program / instructions, characterized in that When the computer program / instruction is executed by a processor, the steps of the method for determining an amplitude-frequency modulation signal based on a phase-locked loop as claimed in any one of claims 1 to 6 are implemented.

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