Amplitude-frequency modulation signal decomposition method and device

Abstract

The invention provides an amplitude-frequency modulation signal decomposition method and device, and relates to the technical field of electric power. The method comprises the following steps: acquiring an amplitude modulation signal and a frequency modulation signal; decomposing the amplitude modulation signal to obtain a first decomposition result of the two-phase voltage under a two-phase rotating coordinate system; decomposing the frequency modulation signal to obtain a second decomposition result of the two-phase voltage under the two-phase rotating coordinate system; and synthesizing the first decomposition result and the second decomposition result to obtain an amplitude-frequency modulation signal decomposition result of the two-phase voltage under the action of an amplitude and frequency common modulation signal in a two-phase rotating coordinate system. The device executes the method. According to the amplitude-frequency modulation signal decomposition method and device provided by the embodiment of the invention, the oscillation component information can be completely reserved through amplitude-frequency modulation signal decomposition, so that the oscillation frequency information can be accurately obtained.

Description

Technical Field

[0001] The present invention relates to the field of electric power technology, and in particular to a method and device for decomposing an amplitude-frequency modulation signal. Background Art

[0002] In recent years, it has become popular in the power industry to use impedance modeling and small signal analysis to study oscillation problems from a frequency domain perspective. A study established an impedance model of a direct-drive wind turbine and a weak power grid, revealing the negative resistance characteristics of the wind turbine at the oscillation frequency. Combining the impedance model with the eigenvalue analysis method provides an effective means for studying the oscillation characteristics of large-scale renewable energy systems. A study proposed an oscillation suppression method that embeds a subsynchronous notch link based on the establishment of a wind farm impedance model, and showed good results in field measurements of multiple working conditions.

[0003] Focusing on the phenomenon of equal amplitude oscillation, some studies have noticed the limitations of linear analysis methods such as small signal modeling in analyzing the nonlinear phenomenon of equal amplitude oscillation, and proposed an analytical calculation method of amplitude-frequency characteristics based on feedback control theory. In addition, many studies use the describing function method to establish the limiting link model of the system, thereby calculating the amplitude and frequency of the equal amplitude oscillation.

[0004] However, when extracting oscillation components, many studies often directly use the discrete Fourier transform (DFT) method to decompose the recorded data to calculate the coupled oscillation frequency. This processing method faces the problems of the Fourier decomposition algorithm's inherent fence effect and spectrum leakage. If the numerous DFT improved algorithms based on interpolation and iteration are simply used for analysis, they also lack attention to the complete information of the oscillation components; in addition, direct DFT analysis of recorded data does not have a clear physical meaning, and it is difficult to deeply explore the essence of the oscillation phenomenon. Summary of the invention

[0005] In view of the problems in the prior art, an embodiment of the present invention provides a method and device for decomposing an amplitude-frequency modulation signal, which can at least partially solve the problems in the prior art.

[0006] On the one hand, the present invention provides a method for decomposing an amplitude-frequency modulation signal, comprising:

[0007] Acquire an amplitude modulation signal and a frequency modulation signal;

[0008] Decomposing the amplitude modulated signal to obtain a first decomposition result of the two-phase voltage in a two-phase rotating coordinate system; decomposing the frequency modulated signal to obtain a second decomposition result of the two-phase voltage in a two-phase rotating coordinate system;

[0009] The first decomposition result and the second decomposition result are synthesized to obtain a decomposition result of an amplitude-frequency modulation signal of a two-phase voltage under the action of an amplitude and frequency common modulation signal in a two-phase rotating coordinate system.

[0010] Wherein, the obtaining of the amplitude modulation signal and the frequency modulation signal comprises:

[0011] The amplitude modulation signal and the frequency modulation signal are extracted from the three-phase voltage calculation expression.

[0012] The step of decomposing the amplitude modulated signal to obtain a first decomposition result of the two-phase voltage in a two-phase rotating coordinate system includes:

[0013] The d-axis is oriented in the vector direction of the initial voltage of the corresponding node, thereby obtaining a first voltage d-axis component and a first voltage q-axis component.

[0014] The first voltage d-axis component is represented by the following expression:

[0015]

[0016] Among them, u d1 is the first voltage d-axis component, U is the amplitude modulation signal, U1 is the amplitude modulation index, ω1 is the frequency of the amplitude / frequency modulation signal, is the initial phase of the frequency modulated signal.

[0017] The step of decomposing the frequency modulated signal to obtain a second decomposition result of the two-phase voltage in a two-phase rotating coordinate system includes:

[0018] When the system power frequency is used as a fixed rotation speed, a second voltage d-axis component and a second voltage q-axis component are obtained.

[0019] The second voltage d-axis component and the second voltage q-axis component are expressed according to the following expressions:

[0020]

[0021] Among them, u d2 is the second voltage d-axis component, u q2 is the second voltage q-axis component, U0 is the initial voltage of the node, A1 is the frequency modulation index, is the initial phase of the amplitude modulated signal.

[0022] The decomposition result of the amplitude-frequency modulation signal is expressed according to the following expression:

[0023]

[0024] Among them, u dis the voltage d-axis component, u q is the voltage q-axis component;

[0025]

[0026]

[0027] In one aspect, the present invention provides an amplitude-frequency modulation signal decomposition device, comprising:

[0028] An acquisition unit, used for acquiring an amplitude modulation signal and a frequency modulation signal;

[0029] A decomposition unit, configured to decompose the amplitude modulated signal to obtain a first decomposition result of the two-phase voltage in a two-phase rotating coordinate system; and decompose the frequency modulated signal to obtain a second decomposition result of the two-phase voltage in a two-phase rotating coordinate system;

[0030] A synthesis unit is used to synthesize the first decomposition result and the second decomposition result to obtain an amplitude-frequency modulation signal decomposition result of the two-phase voltage under the action of the amplitude and frequency common modulation signal in a two-phase rotating coordinate system.

[0031] In another aspect, an embodiment of the present invention provides an electronic device, including: a processor, a memory, and a bus, wherein:

[0032] The processor and the memory communicate with each other via the bus;

[0033] The memory stores program instructions that can be executed by the processor, and the processor calls the program instructions to execute the following method:

[0034] Acquire an amplitude modulation signal and a frequency modulation signal;

[0035] Decomposing the amplitude modulated signal to obtain a first decomposition result of the two-phase voltage in a two-phase rotating coordinate system; decomposing the frequency modulated signal to obtain a second decomposition result of the two-phase voltage in a two-phase rotating coordinate system;

[0036] The first decomposition result and the second decomposition result are synthesized to obtain a decomposition result of an amplitude-frequency modulation signal of a two-phase voltage under the action of an amplitude and frequency common modulation signal in a two-phase rotating coordinate system.

[0037] An embodiment of the present invention provides a non-transitory computer-readable storage medium, including:

[0038] The non-transitory computer-readable storage medium stores computer instructions, which cause the computer to execute the following method:

[0039] Acquire an amplitude modulation signal and a frequency modulation signal;

[0040] Decomposing the amplitude modulated signal to obtain a first decomposition result of the two-phase voltage in a two-phase rotating coordinate system; decomposing the frequency modulated signal to obtain a second decomposition result of the two-phase voltage in a two-phase rotating coordinate system;

[0041] The first decomposition result and the second decomposition result are synthesized to obtain a decomposition result of an amplitude-frequency modulation signal of a two-phase voltage under the action of an amplitude and frequency common modulation signal in a two-phase rotating coordinate system.

[0042] The amplitude-frequency modulation signal decomposition method and device provided in the embodiment of the present invention obtain an amplitude modulation signal and a frequency modulation signal; decompose the amplitude modulation signal to obtain a first decomposition result of the two-phase voltage in a two-phase rotating coordinate system; decompose the frequency modulation signal to obtain a second decomposition result of the two-phase voltage in the two-phase rotating coordinate system; synthesize the first decomposition result and the second decomposition result to obtain an amplitude-frequency modulation signal decomposition result of the two-phase voltage under the action of the amplitude and frequency co-modulation signal in the two-phase rotating coordinate system. The decomposition of the amplitude-frequency modulation signal can completely retain the oscillation component information, thereby achieving accurate acquisition of the oscillation frequency information. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the prior art descriptions. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0044] Figure 1 It is a flow chart of a method for decomposing an amplitude-frequency modulation signal provided by an embodiment of the present invention.

[0045] Figure 2 It is a schematic diagram for explaining the voltage amplitude provided by an embodiment of the present invention.

[0046] Figure 3 It is a schematic diagram for explaining the instantaneous value and measured value of voltage provided by an embodiment of the present invention.

[0047] Figure 4 It is a schematic diagram illustrating the oscillation frequency measurement result provided by an embodiment of the present invention.

[0048] Figure 5 It is a structural schematic diagram of an amplitude-frequency modulation signal decomposition device provided by an embodiment of the present invention.

[0049] Figure 6 A schematic diagram of the physical structure of an electronic device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0050] In order to make the purpose, technical scheme and advantages of the embodiments of the present invention more clear, the embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings. Here, the illustrative embodiments of the present invention and their descriptions are used to explain the present invention, but are not intended to limit the present invention. It should be noted that, in the absence of conflict, the embodiments in this application and the features in the embodiments can be combined with each other arbitrarily.

[0051] Figure 1 FIG. 1 is a flow chart of a method for decomposing an amplitude-frequency modulation signal provided by an embodiment of the present invention. Figure 1 As shown, the amplitude-frequency modulation signal decomposition method provided by the embodiment of the present invention includes:

[0052] Step S1: Acquire an amplitude modulation signal and a frequency modulation signal.

[0053] Step S2: decomposing the amplitude modulated signal to obtain a first decomposition result of the two-phase voltage in a two-phase rotating coordinate system; decomposing the frequency modulated signal to obtain a second decomposition result of the two-phase voltage in a two-phase rotating coordinate system.

[0054] Step S3: synthesizing the first decomposition result and the second decomposition result to obtain a decomposition result of an amplitude-frequency modulation signal of a two-phase voltage under the action of an amplitude and frequency common modulation signal in a two-phase rotating coordinate system.

[0055] In the above step S1, the device acquires an amplitude modulated signal and a frequency modulated signal. The device may be a computer device that executes the method. It should be noted that the acquisition and analysis of data involved in the embodiment of the present invention is authorized by the user. The acquisition of the amplitude modulated signal and the frequency modulated signal includes:

[0056] The amplitude modulation signal and frequency modulation signal are extracted from the three-phase voltage calculation expression. The three-phase voltage calculation expression is shown as follows:

[0057]

[0058] Among them, u a 、u b and u c is the three-phase voltage, U is the peak value of the voltage, which can represent the amplitude modulation signal, and ω is the frequency of the AC voltage.

[0059] Furthermore,

[0060] Where a1 represents the frequency modulation signal, ω0 is the system power frequency, ω1 is the frequency of the amplitude / frequency modulation signal, and are the initial phases of the amplitude / frequency modulation signals, U0 is the initial voltage of the node, A1 and U1 are the frequency modulation index and amplitude modulation index respectively.

[0061] In the above step S2, the device decomposes the amplitude modulation signal to obtain a first decomposition result of the two-phase voltage in the two-phase rotating coordinate system; decomposes the frequency modulation signal to obtain a second decomposition result of the two-phase voltage in the two-phase rotating coordinate system. Under the premise of finding the position angle ψ, the current I in the dq coordinate system is d and I q The d-axis of the rotating coordinate system coincides with the U vector, and the q-axis is perpendicular to the U vector, so that I α and I β Project them onto the d axis respectively, and you can get the current I d and I q The analytical expression of , the relevant coordinate transformation formula is:

[0062]

[0063] in,

[0064]

[0065] Among them, I A and I B is the two-phase current in the rectangular coordinate system, θ is the phase angle of the voltage vector, and θ1 is the initial phase angle of the voltage vector, which is a constant and can be calculated based on the position angle ψ. α and I β are the currents of the two-phase stationary coordinate system, u α and u β are the voltages of the two-phase stationary coordinate system respectively.

[0066] The value of the voltage dq component under standard sinusoidal excitation is:

[0067]

[0068] Here u d and u q It is the theoretical basis for the subsequent calculation of the first voltage d-axis component, the first voltage q-axis component, the second voltage d-axis component, and the second voltage q-axis component, which is different from the u in the decomposition result of the amplitude-frequency modulation signal. d and u q .

[0069] The step of decomposing the amplitude modulated signal to obtain a first decomposition result of the two-phase voltage in a two-phase rotating coordinate system includes:

[0070] The d-axis is oriented in the vector direction of the initial voltage of the corresponding node, thereby obtaining a first voltage d-axis component and a first voltage q-axis component.

[0071] The first voltage d-axis component is represented by the following expression:

[0072]

[0073] Among them, u d1 is the first voltage d-axis component, U is the amplitude modulation signal, U1 is the amplitude modulation index, ω1 is the frequency of the amplitude / frequency modulation signal, is the initial phase of the frequency modulated signal.

[0074] Under the action of amplitude modulation signal:

[0075] When the d-axis is oriented in the direction of the grid voltage vector U0, the voltage q-axis component is zero, and we have:

[0076]

[0077] In the three-phase stationary coordinate system, the phase angle of the positive sequence voltage synthesis vector lags behind the A phase (Ua) by 90°. Therefore, taking Ub as the starting angle q of the rotation transformation, the A phase angle wt=q+90°, that is:

[0078]

[0079] Decomposing the frequency modulated signal to obtain a second decomposition result of the two-phase voltage in a two-phase rotating coordinate system includes:

[0080] When the system power frequency is used as a fixed rotation speed, a second voltage d-axis component and a second voltage q-axis component are obtained.

[0081] The second voltage d-axis component and the second voltage q-axis component are expressed according to the following expressions:

[0082]

[0083] Among them, u d2 is the second voltage d-axis component, u q2 is the second voltage q-axis component, U0 is the initial voltage of the node, A1 is the frequency modulation index, is the initial phase of the amplitude modulated signal.

[0084] Under the effect of frequency modulation signal:

[0085] When rotating at a fixed speed w0, the voltage component expression on the dq axis is:

[0086]

[0087] Where θ0 is the voltage vector phase angle corresponding to ω0.

[0088] In the above step S3, the device synthesizes the first decomposition result and the second decomposition result to obtain the amplitude-frequency modulation signal decomposition result of the two-phase voltage under the action of the amplitude and frequency common modulation signal in the two-phase rotating coordinate system. The amplitude-frequency modulation signal decomposition result is expressed according to the following expression:

[0089]

[0090] Among them, u d is the voltage d-axis component, u q is the voltage q-axis component;

[0091]

[0092]

[0093] Under the combined modulation signal of amplitude and frequency, we have:

[0094]

[0095] In summary, in the dq coordinate system, the amplitude-frequency modulated signal can be decomposed into:

[0096]

[0097] Among them, u d is the voltage d-axis component, u q is the voltage q-axis component;

[0098]

[0099]

[0100] A simulation model was built in Matlab / Simulink, and the amplitude and frequency modulation signal decomposition effects of field data were verified using some typical working conditions.

[0101] The amplitude, instantaneous value and measured value of the oscillating voltage are measured, such as Figure 2 As shown in the figure, it can be clearly seen that the voltage waveform fluctuates greatly and the waveform is not smooth; Figure 3 As shown, it shows that the instantaneous voltage value is basically consistent with the measured value, which proves the accuracy of the amplitude-frequency modulation signal decomposition.

[0102] like Figure 4As shown in the figure, it is the frequency waveform after removing the power frequency of 50Hz. It can be seen that there is a frequency oscillation of 0.813Hz. Referring to the frequency deviation protection setting allowed by the power system, the amplitude of 0.813Hz shows that the oscillation process is accompanied by very strong frequency oscillation, which must be accurately described, proving the necessity of amplitude-frequency modulation signal decomposition.

[0103] The amplitude-frequency modulation signal decomposition method provided in the embodiment of the present invention obtains an amplitude modulation signal and a frequency modulation signal; decomposes the amplitude modulation signal to obtain a first decomposition result of the two-phase voltage in a two-phase rotating coordinate system; decomposes the frequency modulation signal to obtain a second decomposition result of the two-phase voltage in the two-phase rotating coordinate system; synthesizes the first decomposition result and the second decomposition result to obtain an amplitude-frequency modulation signal decomposition result of the two-phase voltage under the action of the amplitude and frequency common modulation signal in the two-phase rotating coordinate system. The decomposition of the amplitude-frequency modulation signal can completely retain the oscillation component information, thereby achieving accurate acquisition of the oscillation frequency information.

[0104] Further, the obtaining of the amplitude modulation signal and the frequency modulation signal comprises:

[0105] The amplitude modulation signal and the frequency modulation signal are extracted from the three-phase voltage calculation expression. The above-mentioned embodiments can be referred to for explanation and will not be described in detail.

[0106] Furthermore, the step of decomposing the amplitude modulated signal to obtain a first decomposition result of the two-phase voltage in a two-phase rotating coordinate system includes:

[0107] The d-axis is oriented in the vector direction of the initial voltage of the corresponding node to obtain a first voltage d-axis component and a first voltage q-axis component. The above description may be referred to and will not be repeated herein.

[0108] Further, the first voltage d-axis component is represented by the following expression:

[0109]

[0110] Among them, u d1 is the first voltage d-axis component, U is the amplitude modulation signal, U1 is the amplitude modulation index, ω1 is the frequency of the amplitude / frequency modulation signal, The initial phase of the frequency modulation signal can be referred to the above embodiment and will not be described in detail.

[0111] Furthermore, the decomposing the frequency modulated signal to obtain a second decomposition result of the two-phase voltage in a two-phase rotating coordinate system includes:

[0112] When the system power frequency is used as a fixed rotation speed, a second voltage d-axis component and a second voltage q-axis component are obtained. The above description can be referred to, and no further details are given.

[0113] Further, the second voltage d-axis component and the second voltage q-axis component are expressed according to the following expressions:

[0114]

[0115] Among them, u d2 is the second voltage d-axis component, u q2 is the second voltage q-axis component, U0 is the initial voltage of the node, A1 is the frequency modulation index, is the initial phase of the amplitude modulation signal. Please refer to the above embodiment for description, and no further details will be given.

[0116] Furthermore, the amplitude-frequency modulation signal decomposition result is expressed according to the following expression:

[0117]

[0118] Among them, u d is the voltage d-axis component, u q is the voltage q-axis component;

[0119]

[0120] Please refer to the above embodiments for description and no further details will be given.

[0121] Figure 5 FIG. 1 is a schematic diagram of the structure of an amplitude-frequency modulation signal decomposition device provided by an embodiment of the present invention. Figure 5 As shown, the amplitude-frequency modulation signal decomposition device provided by the embodiment of the present invention includes an acquisition unit 501, a decomposition unit 502 and a synthesis unit 503, wherein:

[0122] The acquisition unit 501 is used to acquire an amplitude modulation signal and a frequency modulation signal; the decomposition unit 502 is used to decompose the amplitude modulation signal to obtain a first decomposition result of the two-phase voltage in a two-phase rotating coordinate system; and the frequency modulation signal is decomposed to obtain a second decomposition result of the two-phase voltage in a two-phase rotating coordinate system; the synthesis unit 503 is used to synthesize the first decomposition result and the second decomposition result to obtain a decomposition result of the amplitude-frequency modulation signal of the two-phase voltage under the action of the amplitude and frequency common modulation signal in the two-phase rotating coordinate system.

[0123] Specifically, the acquisition unit 501 in the device is used to acquire an amplitude modulation signal and a frequency modulation signal; the decomposition unit 502 is used to decompose the amplitude modulation signal to obtain a first decomposition result of the two-phase voltage in a two-phase rotating coordinate system; the frequency modulation signal is decomposed to obtain a second decomposition result of the two-phase voltage in a two-phase rotating coordinate system; the synthesis unit 503 is used to synthesize the first decomposition result and the second decomposition result to obtain the amplitude-frequency modulation signal decomposition result of the two-phase voltage under the action of the amplitude and frequency joint modulation signal in the two-phase rotating coordinate system.

[0124] The amplitude-frequency modulation signal decomposition device provided in the embodiment of the present invention obtains an amplitude modulation signal and a frequency modulation signal; decomposes the amplitude modulation signal to obtain a first decomposition result of the two-phase voltage in a two-phase rotating coordinate system; decomposes the frequency modulation signal to obtain a second decomposition result of the two-phase voltage in the two-phase rotating coordinate system; synthesizes the first decomposition result and the second decomposition result to obtain an amplitude-frequency modulation signal decomposition result of the two-phase voltage under the action of the amplitude and frequency common modulation signal in the two-phase rotating coordinate system. The decomposition of the amplitude-frequency modulation signal can completely retain the oscillation component information, thereby achieving accurate acquisition of the oscillation frequency information.

[0125] The embodiment of the present invention provides an embodiment of an amplitude-frequency modulation signal decomposition device which can be specifically used to execute the processing flow of the above-mentioned method embodiments. Its functions are not described in detail here, and reference can be made to the detailed description of the above-mentioned method embodiments.

[0126] Figure 6 A schematic diagram of the physical structure of an electronic device provided in an embodiment of the present invention, such as Figure 6 As shown, the electronic device includes: a processor (processor) 601, a memory (memory) 602 and a bus 603;

[0127] The processor 601 and the memory 602 communicate with each other via a bus 603;

[0128] The processor 601 is used to call the program instructions in the memory 602 to execute the methods provided by the above method embodiments, for example, including:

[0129] Acquire an amplitude modulation signal and a frequency modulation signal;

[0130] Decomposing the amplitude modulated signal to obtain a first decomposition result of the two-phase voltage in a two-phase rotating coordinate system; decomposing the frequency modulated signal to obtain a second decomposition result of the two-phase voltage in a two-phase rotating coordinate system;

[0131] The first decomposition result and the second decomposition result are synthesized to obtain a decomposition result of an amplitude-frequency modulation signal of a two-phase voltage under the action of an amplitude and frequency common modulation signal in a two-phase rotating coordinate system.

[0132] This embodiment discloses a computer program product, which includes a computer program stored on a non-transitory computer-readable storage medium. The computer program includes program instructions. When the program instructions are executed by a computer, the computer can perform the methods provided by the above method embodiments, for example, including:

[0133] Acquire an amplitude modulation signal and a frequency modulation signal;

[0134] Decomposing the amplitude modulated signal to obtain a first decomposition result of the two-phase voltage in a two-phase rotating coordinate system; decomposing the frequency modulated signal to obtain a second decomposition result of the two-phase voltage in a two-phase rotating coordinate system;

[0135] The first decomposition result and the second decomposition result are synthesized to obtain a decomposition result of an amplitude-frequency modulation signal of a two-phase voltage under the action of an amplitude and frequency common modulation signal in a two-phase rotating coordinate system.

[0136] This embodiment provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, wherein the computer program enables the computer to execute the methods provided by the above method embodiments, for example, including:

[0137] Acquire an amplitude modulation signal and a frequency modulation signal;

[0138] Decomposing the amplitude modulated signal to obtain a first decomposition result of the two-phase voltage in a two-phase rotating coordinate system; decomposing the frequency modulated signal to obtain a second decomposition result of the two-phase voltage in a two-phase rotating coordinate system;

[0139] The first decomposition result and the second decomposition result are synthesized to obtain a decomposition result of an amplitude-frequency modulation signal of a two-phase voltage under the action of an amplitude and frequency common modulation signal in a two-phase rotating coordinate system.

[0140] Those skilled in the art will appreciate that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention may take 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.) containing computer-usable program code.

[0141] 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.

[0142] 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.

[0143] 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 A step that specifies a function in one or more boxes.

[0144] In the description of this specification, the description with reference to the terms "one embodiment", "a specific embodiment", "some embodiments", "for example", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0145] The specific embodiments described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for decomposing an amplitude-frequency modulated signal, characterized in that: include: Acquiring an amplitude modulation signal and a frequency modulation signal; Decomposing the amplitude modulated signal to obtain a first decomposition result of the two-phase voltage in a two-phase rotating coordinate system; Decomposing the frequency modulated signal to obtain a second decomposition result of the two-phase voltage in a two-phase rotating coordinate system; The first decomposition result and the second decomposition result are synthesized to obtain a decomposition result of an amplitude-frequency modulation signal of a two-phase voltage under the action of an amplitude and frequency common modulation signal in a two-phase rotating coordinate system.

2. The method for decomposing an amplitude-frequency modulation signal according to claim 1, wherein: The obtaining of the amplitude modulation signal and the frequency modulation signal comprises: The amplitude modulation signal and the frequency modulation signal are extracted from the three-phase voltage calculation expression.

3. The method for decomposing an amplitude-frequency modulation signal according to claim 1, wherein: Decomposing the amplitude modulated signal to obtain a first decomposition result of the two-phase voltage in a two-phase rotating coordinate system includes: The d-axis is oriented in the vector direction of the initial voltage of the corresponding node, thereby obtaining a first voltage d-axis component and a first voltage q-axis component.

4. The method for decomposing an amplitude-frequency modulation signal according to claim 3, wherein: The first voltage d-axis component is expressed as follows: Among them, u d1 is the first voltage d-axis component, U is the amplitude modulation signal, U1 is the amplitude modulation index, ω1 is the frequency of the amplitude / frequency modulation signal, is the initial phase of the frequency modulated signal.

5. The method for decomposing an amplitude-frequency modulation signal according to claim 4, wherein: Decomposing the frequency modulated signal to obtain a second decomposition result of the two-phase voltage in a two-phase rotating coordinate system includes: When the system power frequency is used as a fixed rotational speed, a second voltage d-axis component and a second voltage q-axis component are obtained.

6. The method for decomposing an amplitude-frequency modulation signal according to claim 5, wherein: The second voltage d-axis component and the second voltage q-axis component are expressed according to the following expressions: Among them, u d2 is the second voltage d-axis component, u q2 is the second voltage q-axis component, U0 is the initial voltage of the node, A1 is the frequency modulation index, is the initial phase of the amplitude modulated signal.

7. The method for decomposing an amplitude-frequency modulation signal according to claim 6, wherein: The decomposition result of the amplitude-frequency modulation signal is expressed as follows: Among them, u d is the voltage d-axis component, u q is the voltage q-axis component; 8. An amplitude-frequency modulation signal decomposition device, characterized in that: include: An acquisition unit, configured to acquire an amplitude modulation signal and a frequency modulation signal; a decomposition unit, configured to decompose the amplitude modulated signal to obtain a first decomposition result of the two-phase voltage in a two-phase rotating coordinate system; Decomposing the frequency modulated signal to obtain a second decomposition result of the two-phase voltage in a two-phase rotating coordinate system; A synthesis unit is used to synthesize the first decomposition result and the second decomposition result to obtain a decomposition result of the amplitude-frequency modulation signal of the two-phase voltage under the action of the amplitude and frequency common modulation signal in a two-phase rotating coordinate system.

9. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 7 are implemented.

10. 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 7 are implemented.

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