WO2024045569A1 - 逆变器阻抗测量方法、装置、终端设备及存储介质 - Google Patents

逆变器阻抗测量方法、装置、终端设备及存储介质 Download PDF

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Publication number
WO2024045569A1
WO2024045569A1 PCT/CN2023/082794 CN2023082794W WO2024045569A1 WO 2024045569 A1 WO2024045569 A1 WO 2024045569A1 CN 2023082794 W CN2023082794 W CN 2023082794W WO 2024045569 A1 WO2024045569 A1 WO 2024045569A1
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frequency
domain signal
disturbance
response current
impedance
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English (en)
French (fr)
Inventor
孟良
范辉
胡雪凯
李铁成
孟政吉
苏灿
周文
王磊
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Electric Power Research Institute of State Grid Hebei Electric Power Co Ltd
State Grid Hebei Energy Technology Service Co Ltd
State Grid Corp of China SGCC
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Electric Power Research Institute of State Grid Hebei Electric Power Co Ltd
State Grid Hebei Energy Technology Service Co Ltd
State Grid Corp of China SGCC
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Publication of WO2024045569A1 publication Critical patent/WO2024045569A1/zh
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
    • G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
    • G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
    • G01R27/08—Measuring resistance by measuring both voltage and current

Definitions

  • This application relates to the technical field of impedance measurement, specifically an inverter impedance measurement method, device, terminal equipment and storage medium.
  • Power electronic equipment such as inverters have the advantage of being flexible and controllable, which can significantly enhance the control capability of the power system.
  • a large number of new equipment are connected to the power grid transmission and distribution network through power electronic equipment, and the degree of electronic power grid is constantly improving.
  • Port impedance can comprehensively characterize the dynamic characteristics of power electronic equipment such as inverters, and the impedance results can be used to analyze the dynamic characteristics of the inverter.
  • embodiments of the present application provide an inverter impedance measurement method, device, terminal equipment and storage medium to solve the problem of low measurement accuracy of existing inverter impedance measurement methods, thereby reducing the subsequent cost of inverter impedance measurement. technical issues regarding the accuracy of the dynamic characteristics analysis of the inverter.
  • embodiments of the present application provide an inverter impedance measurement method, which includes: acquiring a first disturbance voltage frequency domain signal and a first response current frequency domain signal when a disturbance voltage of a first disturbance frequency is injected into the inverter.
  • the second disturbance voltage frequency domain signal and the second response current frequency domain signal when the disturbance voltage of the second disturbance frequency is injected into the inverter; determine according to the first disturbance voltage frequency domain signal and the first response current frequency domain signal
  • the first disturbance voltage signal and the first response current signal; the second disturbance voltage signal and the second response current signal are determined according to the second disturbance voltage frequency domain signal and the second response current frequency domain signal; the first disturbance frequency and the second disturbance frequency are the frequencies on both sides of the preset frequency;
  • the first impedance of the first disturbance frequency is determined according to the first disturbance voltage signal and the first response current signal, and the first impedance of the second disturbance frequency is determined according to the second disturbance voltage signal and the second response current signal.
  • Two impedances determine the impedance of the preset frequency based on the first impedance and the second impedance.
  • the first disturbance voltage frequency domain signal and the first response current frequency domain signal when the disturbance voltage of the first disturbance frequency is injected into the inverter are obtained;
  • the second disturbance voltage frequency domain signal and the second response current frequency domain signal when the disturbance voltage is at the second disturbance frequency include: obtaining the first disturbance voltage time domain signal when the disturbance voltage at the first disturbance frequency is injected into the inverter and The first response current time domain signal; obtain the second disturbance voltage time domain signal and the second response current time domain signal when the disturbance voltage of the second disturbance frequency is injected into the inverter; respectively analyze the first disturbance voltage time domain signal and the first response current time domain signal.
  • the first response current time domain signal is subjected to discrete Fourier transform to obtain the first disturbance voltage frequency domain signal and the first response current frequency domain signal;
  • the second disturbance voltage time domain signal and the second response current time domain signal are respectively subjected to discrete Fourier transform.
  • Liye transform is performed to obtain the second disturbance voltage frequency domain signal and the second response current frequency domain signal.
  • the disturbance voltage is a three-phase disturbance voltage
  • the first disturbance voltage time domain signal and the first response current time domain when injecting the disturbance voltage of the first disturbance frequency into the inverter are obtained signal
  • acquiring the second disturbance voltage time domain signal and the second response current time domain signal when injecting the disturbance voltage of the second disturbance frequency into the inverter including: acquiring the first disturbance into the inverter according to the preset sampling frequency The first three-phase disturbance voltage time domain signal and the first three-phase response current time domain signal when the disturbance voltage is at a frequency; according to the preset sampling frequency, the second three-phase disturbance voltage when the disturbance voltage of the second disturbance frequency is injected into the inverter is obtained.
  • Phase disturbance voltage time domain signal and the second three-phase response current time domain signal conduct abc/ on the first three-phase disturbance voltage time domain signal and the first three-phase response current time domain signal respectively.
  • Coordinate transformation is performed to obtain the first disturbance voltage time domain signal after coordinate transformation and the first response current time domain signal after coordinate transformation; conduct the second three-phase disturbance voltage time domain signal and the second three-phase response current time domain signal respectively.
  • abc/ Coordinate transformation to obtain the second disturbance voltage time domain signal after coordinate transformation and the second response current time domain signal after coordinate transformation;
  • discrete Fourier transform is performed on the first disturbance voltage time domain signal and the first response current time domain signal to obtain the first disturbance voltage frequency domain signal and the first response current frequency domain signal; the second disturbance voltage is obtained respectively.
  • the time domain signal and the second response current time domain signal are subjected to discrete Fourier transformation to obtain the second disturbance voltage frequency domain signal and the second response current frequency domain signal, including: respectively transforming the first disturbance voltage time domain signal after coordinate transformation
  • the discrete Fourier transform is performed on the first response current time domain signal after coordinate transformation to obtain the first disturbance voltage frequency domain signal and the first response current frequency domain signal; respectively, the second disturbance voltage time domain signal after coordinate transformation and
  • the coordinate-transformed second response current time domain signal is subjected to discrete Fourier transformation to obtain a second disturbance voltage frequency domain signal and a second response current frequency domain signal.
  • the first disturbance voltage signal and the first response current signal are determined according to the first disturbance voltage frequency domain signal and the first response current frequency domain signal; according to the second disturbance voltage frequency domain signal and the second response current frequency domain signal to determine the second disturbance voltage signal and the second response current signal, including: performing signal extraction on the first disturbance voltage frequency domain signal and the first response current frequency domain signal respectively, and determining the first disturbance frequency The first disturbance voltage signal and the first response current signal; perform signal extraction on the second disturbance voltage frequency domain signal and the second response current frequency domain signal respectively, and determine the second disturbance voltage signal and the second response current signal of the second disturbance frequency.
  • determining the impedance at the preset frequency based on the first impedance and the second impedance includes: performing an average calculation on the first impedance and the second impedance to determine the impedance at the preset frequency.
  • the inverter impedance measurement method further includes: using multiple equally spaced target frequencies in the preset frequency sweep interval as the preset frequencies in sequence, and performing the above-mentioned impedance measurement for the preset frequencies.
  • the determination step is to obtain the impedance of each equally spaced target frequency within the preset frequency sweep interval; for each equally spaced target frequency within the preset frequency sweep interval, determine the phase of the target frequency within the preset frequency sweep interval.
  • the first frequency and the second frequency are adjacent; the first change slope is determined according to the impedance of the disturbance frequency of the first frequency and the impedance of the disturbance frequency of the target frequency; the first change slope is determined according to the impedance of the disturbance frequency of the second frequency and the disturbance frequency of the target frequency.
  • the impedance determines the second change slope; it is judged whether the absolute value of the difference between the first change slope and the second change slope is greater than the preset threshold, and if so, the impedance of the target frequency is corrected.
  • correcting the impedance at the target frequency includes: according to the first change slope The intersection value of the corresponding straight line and the straight line corresponding to the second change slope determines the corrected impedance of the target frequency.
  • an inverter impedance measurement device including:
  • the acquisition module is used to acquire the first disturbance voltage frequency domain signal and the first response current frequency domain signal when the disturbance voltage of the first disturbance frequency is injected into the inverter; and the first disturbance voltage frequency domain signal is obtained when the disturbance voltage of the second disturbance frequency is injected into the inverter. the second disturbance voltage frequency domain signal and the second response current frequency domain signal.
  • the first determination module is used to determine the first disturbance voltage signal and the first response current signal according to the first disturbance voltage frequency domain signal and the first response current frequency domain signal; and to determine the first disturbance voltage signal and the first response current signal according to the second disturbance voltage frequency domain signal and the second response current frequency domain signal.
  • the domain signal determines the second disturbance voltage signal and the second response current signal; the first disturbance frequency and the second disturbance frequency are frequencies on both sides of the preset frequency.
  • a second determination module configured to determine the first impedance of the first disturbance frequency according to the first disturbance voltage signal and the first response current signal, and to determine the second impedance of the second disturbance frequency according to the second disturbance voltage signal and the second response current signal.
  • the third determination module is used to determine the impedance of the preset frequency according to the first impedance and the second impedance.
  • embodiments of the present application provide a terminal device, including a memory and a processor.
  • the memory stores a computer program that can be run on the processor.
  • the processor executes the computer program, any one of the aspects of the first aspect is implemented.
  • embodiments of the present application provide a computer-readable storage medium.
  • the computer-readable storage medium stores a computer program.
  • the computer program is executed by a processor, the inverter impedance as described in any one of the first aspects is achieved. Measurement methods.
  • embodiments of the present application provide a computer program product that, when run on a terminal device, causes the terminal device to perform the inverter impedance measurement method described in any one of the above first aspects.
  • the inverter impedance measurement method, device, terminal equipment and storage medium obtained the first disturbance voltage frequency domain signal and the first response current frequency when the disturbance voltage of the first disturbance frequency is injected into the inverter. domain signal, as well as the second disturbance voltage frequency domain signal and the second response current frequency domain signal when the disturbance voltage of the second disturbance frequency is injected into the inverter.
  • the first disturbance voltage frequency domain signal and the response current frequency domain signal are determined based on the above disturbance voltage frequency domain signal and the response current frequency domain signal.
  • Calculating the average and using the average as the impedance at the preset frequency can improve the accuracy of the impedance at the preset frequency, that is, it can improve the accuracy of the inverter impedance measurement, thereby improving the accuracy of the subsequent dynamic characteristics analysis of the inverter. .
  • Figure 1 is a schematic flow chart of an inverter impedance measurement method provided by an embodiment of the present application
  • Figure 2 is a schematic diagram of the circuit connection between the inverter and the disturbance voltage source provided by an embodiment of the present application
  • Figure 3 is a schematic flow chart of an inverter impedance measurement method provided by another embodiment of the present application.
  • Figure 4 is a schematic flow chart of an inverter impedance measurement method provided by yet another embodiment of the present application.
  • Figure 5 is a schematic flow chart of an inverter impedance measurement method provided by yet another embodiment of the present application.
  • Figure 6 is a Bode plot comparing the calculated impedance value and the theoretical impedance value obtained using the existing inverter impedance measurement method
  • Figure 7 is a schematic diagram of the absolute value of the gain relative error between the calculated impedance value and the theoretical impedance value obtained using the existing inverter impedance measurement method
  • Figure 8 is a schematic diagram of the absolute value of the phase relative error between the calculated impedance value and the theoretical impedance value obtained by using the existing inverter impedance measurement method
  • Figure 9 is a Bode diagram comparing the calculated impedance value and the theoretical impedance value obtained by using the inverter impedance measurement method provided by the embodiment of the present application;
  • Figure 10 is a schematic diagram of the absolute value of the gain relative error between the calculated impedance value and the theoretical impedance value obtained by using the inverter impedance measurement method provided by the embodiment of the present application;
  • Figure 11 is a schematic diagram of the absolute value of the phase relative error between the calculated impedance value and the theoretical impedance value obtained by using the inverter impedance measurement method provided by the embodiment of the present application;
  • Figure 12 is a schematic structural diagram of an inverter impedance measurement device provided by an embodiment of the present application.
  • Figure 13 is a schematic structural diagram of a terminal device provided by an embodiment of the present application.
  • Power electronic equipment such as inverters have the advantage of being flexible and controllable, which can significantly enhance the control capability of the power system.
  • a large number of new equipment are connected to the power grid transmission and distribution network through power electronic equipment, and the degree of electronic power grid is constantly improving.
  • the dynamic characteristics of power electronic equipment are complex and the degree of nonlinearity is strong, which brings serious challenges to the transient stability analysis of power electronic power systems. Problems such as power system oscillation caused by grid connection gradually appear. Therefore, it is very important to study the dynamic characteristics of power electronic equipment in the power grid.
  • Port impedance can comprehensively characterize the dynamic characteristics of power electronic equipment such as inverters, and the impedance results can be used to analyze the dynamic characteristics of the inverter.
  • Existing impedance measurement methods usually apply disturbances at the inverter port and directly use the measurement results corresponding to the frequency sweep points as the impedance results.
  • the accuracy of the impedance results obtained by the above method is relatively low. Low, thereby reducing the accuracy of subsequent dynamic characteristics analysis of the inverter.
  • the inventor found through research that it is possible to inject a disturbance voltage into the inverter, measure the impedance of the disturbance frequency on both sides of the preset frequency, and calculate the average of the above impedance as the impedance of the preset frequency, which can improve the performance of the inverter.
  • To measure the accuracy of the inverter impedance and further determine whether the obtained impedance at the preset frequency needs to be corrected.
  • correct the impedance at the preset frequency to further ensure the reliability of the inverter impedance measurement results. sex.
  • the first disturbance voltage frequency domain signal and the first response current frequency domain signal when the disturbance voltage of the first disturbance frequency is injected into the inverter are obtained, and
  • the second disturbance voltage frequency domain signal and the second response current frequency domain signal when the disturbance voltage of the second disturbance frequency is injected into the inverter, the first disturbance voltage signal and the second response current frequency domain signal are determined based on the above disturbance voltage frequency domain signal and the response current frequency domain signal.
  • the first response current signal, and the second disturbance voltage signal and the second response current signal are determined, wherein the first disturbance frequency and the second disturbance frequency are frequencies on both sides of the preset frequency, determined according to the above disturbance voltage signal and the response current signal
  • the first impedance of the first disturbance frequency, and the second impedance of the second disturbance frequency are determined.
  • the impedance of the preset frequency is determined based on the first impedance and the second impedance, and the impedance of the disturbance frequency on both sides of the preset frequency is calculated by averaging.
  • Using the average value as the impedance at the preset frequency can improve the accuracy of the impedance at the preset frequency, that is, it can improve the accuracy of the inverter impedance measurement, thereby improving the accuracy of subsequent dynamic characteristics analysis of the inverter.
  • Figure 1 is a schematic flow chart of an inverter impedance measurement method provided by an embodiment of the present application. As shown in Figure 1, the method in the embodiment of this application may include:
  • Step 101 Obtain the first disturbance voltage frequency domain signal and the first response current frequency domain signal when the disturbance voltage of the first disturbance frequency is injected into the inverter, and obtain the first disturbance voltage when the disturbance voltage of the second disturbance frequency is injected into the inverter.
  • two perturbation voltage frequency domain signals and a second response current frequency domain signal are two perturbation voltage frequency domain signals and a second response current frequency domain signal.
  • FIG. 2 is a schematic diagram of the circuit connection between the inverter and the disturbance voltage source provided by an embodiment of the present application.
  • the inverter is a three-phase inverter and is the inverter to be measured.
  • the offline test voltage source is a three-phase voltage source used to power the inverter.
  • a disturbance voltage source is inserted in series between the inverter and the offline test voltage source.
  • the disturbance voltage source is a three-phase disturbance voltage source and is used to provide the inverter with disturbance voltages of different frequencies within the preset frequency sweep interval.
  • the disturbance voltage is the three-phase disturbance voltage.
  • the first disturbance frequency and the second disturbance frequency are frequencies on both sides of the preset frequency.
  • the preset frequency is a plurality of equally spaced frequencies in a preset frequency sweep interval.
  • the impedance of the above plurality of preset frequencies is measured, that is, the impedance of the inverter at the preset frequency is measured. impedance.
  • the first disturbance frequency and the second disturbance frequency are frequencies on both sides of the preset frequency respectively.
  • the preset frequency sweep interval can be set to the mid-frequency band [500Hz, 5000Hz], then the preset frequency within the preset frequency sweep interval Can be set to 500Hz, 600Hz, 700Hz, , 4900Hz, 5000Hz, a total of 46 preset frequencies, and the first disturbance frequency and the second disturbance frequency of each preset frequency can be set to the preset frequency
  • a frequency of 10Hz for example, if the preset frequency is 600Hz, then the first disturbance frequency corresponding to the preset frequency is 590 Hz, and the second disturbance frequency is 610 Hz. That is to say, there are 92 disturbance frequencies corresponding to 46 preset frequencies. .
  • preset frequency sweep interval preset frequency and corresponding values of the first disturbance frequency and the second disturbance frequency can be set according to specific circumstances, and are not specifically limited here.
  • step 101 may include:
  • Step 1011 Obtain the first disturbance voltage time domain signal and the first response current time domain signal when the disturbance voltage of the first disturbance frequency is injected into the inverter, and obtain the first disturbance voltage when the disturbance voltage of the second disturbance frequency is injected into the inverter.
  • two disturbance voltage time domain signals and a second response current time domain signal are two disturbance voltage time domain signals and a second response current time domain signal.
  • the corresponding time domain signal is acquired during the last disturbance period in which the disturbance voltage is injected.
  • the first disturbance voltage time domain signal and the first response current time domain signal of the last disturbance period under the disturbance voltage are obtained.
  • the second disturbance voltage time domain signal and the second response current time domain signal of the last disturbance period under the disturbance voltage are obtained.
  • Step 1012 Perform discrete Fourier transform on the first disturbance voltage time domain signal and the first response current time domain signal to obtain the first disturbance voltage frequency domain signal and the first response current frequency domain signal.
  • the time domain signal and the second response current time domain signal are subjected to discrete Fourier transform to obtain the second disturbance voltage frequency domain signal and the second response current frequency domain signal.
  • the acquired time domain signal includes the signal corresponding to the fundamental frequency and the signal corresponding to the disturbance frequency. Therefore, it is necessary to perform discrete Fourier transform on the above time domain signal to obtain the corresponding frequency domain signal, and then obtain the corresponding frequency domain signal from the frequency domain signal. Extract the signal corresponding to the disturbance frequency.
  • discrete Fourier transform is performed on the first disturbance voltage time domain signal to obtain the first disturbance voltage frequency domain signal
  • discrete Fourier transform is performed on the first response current time domain signal to obtain the first response current frequency domain signal.
  • Signal. Discrete Fourier transform is performed on the second disturbance voltage time domain signal to obtain the second disturbance voltage frequency domain signal
  • discrete Fourier transform is performed on the second response current time domain signal to obtain the second response current frequency domain signal.
  • step 1011 may include:
  • Step S1 According to the preset sampling frequency, obtain the first three-phase disturbance voltage time domain signal and the first three-phase response current time domain signal when the disturbance voltage of the first disturbance frequency is injected into the inverter.
  • Step S2 According to the preset sampling frequency, obtain the second three-phase disturbance voltage time domain signal and the second three-phase response current time domain signal when the disturbance voltage of the second disturbance frequency is injected into the inverter.
  • Step S3 Perform abc/ on the first three-phase disturbance voltage time domain signal and the first three-phase response current time domain signal respectively. Coordinate transformation is performed to obtain the first disturbance voltage time domain signal after coordinate transformation and the first response current time domain signal after coordinate transformation.
  • Step S4 Perform abc/ on the second three-phase disturbance voltage time domain signal and the second three-phase response current time domain signal respectively.
  • the coordinates are transformed to obtain the second disturbance voltage time domain signal after the coordinate transformation and the second response current time domain signal after the coordinate transformation.
  • the corresponding time domain signal is obtained according to the preset sampling frequency, and the obtained time domain signal is a discrete signal.
  • the preset sampling frequency can be set according to the specific situation.
  • the time domain signal can be obtained with a sampling interval of 5 Hz.
  • the disturbance voltage is a three-phase disturbance voltage.
  • the obtained first disturbance voltage time domain signal when the disturbance voltage of the first disturbance frequency is injected into the inverter includes the first three-phase disturbance voltage time domain signal.
  • the obtained The first response current time domain signal includes a first three-phase response current time domain signal.
  • the obtained second disturbance voltage time domain signal when injecting the disturbance voltage of the second disturbance frequency into the inverter includes the second three-phase disturbance voltage time domain signal, and the obtained second response current time domain signal includes the second three-phase Response to current time domain signals.
  • the three-phase disturbance voltage time domain signal can be expressed as:
  • the three-phase response current time domain signal can be expressed as:
  • the amplitude of the disturbance voltage for example, the amplitude of the disturbance voltage can be 10V
  • the disturbance voltage time domain signal after coordinate transformation is obtained, which can be expressed as:
  • the response current time domain signal after coordinate transformation is obtained, which can be expressed as:
  • abc/ Coordinate transformation formula perform abc/ on the first three-phase disturbance voltage time domain signal Coordinate transformation, obtain the first disturbance voltage time domain signal after coordinate transformation, and perform abc/ on the first three-phase response current time domain signal Coordinate transformation is performed to obtain the first response current time domain signal after coordinate transformation.
  • Perform abc/ on the second three-phase disturbance voltage time domain signal Coordinate transformation obtain the second disturbance voltage time domain signal after coordinate transformation, and perform abc/ on the second three-phase response current time domain signal Coordinate transformation is performed to obtain the second response current time domain signal after coordinate transformation.
  • step 1012 specific steps may include:
  • Step S11 Perform discrete Fourier transform on the first disturbance voltage time domain signal after coordinate transformation and the first response current time domain signal after coordinate transformation to obtain the first disturbance voltage frequency domain signal and the first response current frequency domain signal. Signal.
  • Step S12 Perform discrete Fourier transform on the second disturbance voltage time domain signal after coordinate transformation and the second response current time domain signal after coordinate transformation respectively to obtain the second disturbance voltage frequency domain signal and the second response current frequency domain signal. Signal.
  • the discrete Fourier transform is performed on the time domain signal after coordinate transformation to obtain the frequency domain signal, which can be expressed as:
  • the discrete Fourier transform is performed on the first disturbance voltage time domain signal after coordinate transformation to obtain the first disturbance voltage frequency domain signal, and the first response current after coordinate transformation is obtained.
  • the time domain signal undergoes discrete Fourier transform to obtain the first response current frequency domain signal.
  • Step 102 Determine the first disturbance voltage signal and the first response current signal according to the first disturbance voltage frequency domain signal and the first response current frequency domain signal, and determine the first disturbance voltage signal and the first response current frequency domain signal according to the second disturbance voltage frequency domain signal and the second response current frequency domain signal. two disturbance voltage signals and a second response current signal.
  • step 102 may specifically include:
  • Step 1021 Perform signal extraction on the first disturbance voltage frequency domain signal and the first response current frequency domain signal respectively, and determine the first disturbance voltage signal and the first response current signal of the first disturbance frequency.
  • Step 1022 Perform signal extraction on the second disturbance voltage frequency domain signal and the second response current frequency domain signal respectively, and determine the second disturbance voltage signal and the second response current signal of the second disturbance frequency.
  • extract the signal corresponding to the disturbance frequency from the frequency domain signal Specifically, perform signal extraction on the first disturbance voltage frequency domain signal to determine the first disturbance voltage signal at the first disturbance frequency, perform signal extraction on the first response current frequency domain signal, and determine the first response current at the first disturbance frequency.
  • Step 103 Determine the first impedance at the first disturbance frequency according to the first disturbance voltage signal and the first response current signal, and determine the second impedance at the second disturbance frequency according to the second disturbance voltage signal and the second response current signal.
  • the impedance calculation formula is:
  • the first disturbance frequency is the second disturbance frequency
  • is the first impedance is the second impedance
  • is the first disturbance voltage signal is the first response current signal
  • is the second disturbance voltage signal is the second response current signal.
  • Step 104 Determine the impedance of the preset frequency based on the first impedance and the second impedance.
  • step 104 may specifically include: performing an average calculation on the first impedance and the second impedance to determine the impedance at the preset frequency.
  • the impedance at the preset frequency can be expressed as:
  • the first disturbance frequency and the second disturbance frequency of each preset frequency are determined according to the preset frequency within the preset frequency sweep interval, and disturbance voltages of different frequencies are injected into the inverter according to the above disturbance frequency, and Repeat steps 101 to 104 to determine the impedance of each preset frequency within the preset frequency sweep interval, so as to analyze the dynamic characteristics of the inverter based on the above multiple preset frequencies and the impedance of the preset frequency.
  • the average value is used as the impedance of the preset frequency. , which can improve the accuracy of the impedance at the preset frequency, that is, it can improve the accuracy of the inverter impedance measurement, thereby improving the accuracy of subsequent dynamic characteristics analysis of the inverter.
  • the inverter impedance measurement method provided by the embodiment of the present application may also include:
  • Step 105 Use multiple equally spaced target frequencies in the preset frequency sweep interval as the preset frequency in sequence, perform the above steps of determining the impedance of the preset frequency, and obtain the values of each equally spaced target frequency in the preset frequency sweep interval. impedance.
  • multiple equally spaced target frequencies in the preset frequency sweep interval are used as preset frequencies in sequence, the first disturbance frequency and the second disturbance frequency of the preset frequency are determined, and different frequencies are injected into the inverter according to the above disturbance frequencies.
  • the disturbance voltage is obtained, and steps 101 to 104 are performed to obtain the impedance of each equally spaced target frequency within the preset frequency sweep interval.
  • step 105 For the specific implementation process and principle of step 105 in this embodiment, please refer to the foregoing embodiments and will not be described again here.
  • Step 106 For each equally spaced target frequency in the preset frequency sweep interval, determine the adjacent first frequency and second frequency of the target frequency in the preset frequency sweep interval; according to the disturbance frequency of the first frequency The impedance and the impedance of the perturbation frequency of the target frequency determine the first change slope; the second change slope is determined according to the impedance of the perturbation frequency of the second frequency and the impedance of the perturbation frequency of the target frequency; determine the first change slope and the second change slope Whether the absolute value of the difference is greater than the preset threshold, if so, correct the impedance of the target frequency.
  • the first frequency and the second frequency adjacent to the target frequency within the preset frequency sweep interval are respectively the other two target frequencies adjacent to the target frequency within the preset frequency sweep interval, for example,
  • the preset frequency sweep interval is set to the mid-frequency band [500Hz, 5000Hz]
  • the target frequency is 700Hz
  • the adjacent first and second frequencies of the target frequency within the preset frequency sweep interval are 600 Hz and 600Hz respectively. 800Hz.
  • the first change slope is determined according to the impedance of the second disturbance frequency of the first frequency and the impedance of the first disturbance frequency of the target frequency
  • the first change slope is determined according to the impedance of the first disturbance frequency of the second frequency and the target frequency.
  • the impedance of the second perturbation frequency determines the second change slope.
  • the first change slope is the second change slope, is the target frequency
  • the first disturbance frequency the impedance is the second disturbance frequency of the target frequency the impedance, is the second disturbance frequency of the first frequency the impedance, is the first disturbance frequency of the second frequency of impedance.
  • a simple example is that when the preset frequency sweep interval is set to the mid-frequency band [500Hz, 5000Hz], and the target frequency is 700Hz, then the target frequency is the adjacent first frequency and second frequency in the preset frequency sweep interval.
  • the frequencies are 600 Hz and 800 Hz respectively.
  • the first disturbance frequency of the first frequency is 590 Hz and the second disturbance frequency is 610 Hz.
  • the first disturbance frequency of the second frequency is 790 Hz and the second disturbance frequency is 810 Hz.
  • the target The first disturbance frequency is 690 Hz and the second disturbance frequency is 710 Hz.
  • the impedance of the target frequency does not need to be corrected.
  • the step of correcting the impedance of the target frequency may specifically include: corresponding to the first change slope The intersection value of the straight line and the straight line corresponding to the second change slope determines the corrected impedance of the target frequency.
  • the straight line corresponding to the first change slope and the straight line corresponding to the second change slope can be respectively expressed as:
  • An embodiment of the present application provides an inverter impedance measurement method by obtaining the first disturbance voltage frequency domain signal and the first response current frequency domain signal when a disturbance voltage of the first disturbance frequency is injected into the inverter, and for the inverter
  • the second disturbance voltage frequency domain signal and the second response current frequency domain signal when the disturbance voltage of the second disturbance frequency is injected into the transformer, the first disturbance voltage signal and the first response current frequency domain signal are determined according to the above disturbance voltage frequency domain signal and the response current frequency domain signal.
  • Respond to the current signal and determine the second disturbance voltage signal and the second response current signal, wherein the first disturbance frequency and the second disturbance frequency are frequencies on both sides of the preset frequency, and determine the first disturbance voltage signal and the response current signal based on the above.
  • the first impedance of the disturbance frequency and the second impedance of the second disturbance frequency are determined.
  • the impedance of the preset frequency is determined based on the first impedance and the second impedance.
  • the average value of the impedance of the disturbance frequency on both sides of the preset frequency is calculated and the As the impedance at the preset frequency, the mean value can improve the accuracy of the impedance at the preset frequency, that is, it can improve the accuracy of the inverter impedance measurement, thereby improving the accuracy of subsequent dynamic characteristics analysis of the inverter.
  • sequence number of each step in the above embodiment does not mean the order of execution.
  • the execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiment of the present application.
  • an inverter impedance test model is built in the Matlab platform or Simulink platform to calculate the theoretical value of the impedance at the preset frequency, which is called The theoretical impedance value, and the impedance at the preset frequency obtained according to the inverter impedance measurement method is called the calculated impedance value, wherein the above-mentioned inverter impedance measurement method may include the inverter impedance measurement method provided by the embodiment of the present application,
  • the Matlab platform was used to conduct comparative analysis of the above theoretical impedance values and calculated impedance values.
  • Figure 6 is a Bode plot comparing the calculated impedance value and the theoretical impedance value obtained using the existing inverter impedance measurement method. Refer to Figure 6. The curve represents the theoretical impedance value, and the discrete asterisk points represent the calculated impedance value.
  • Figure 7 is a schematic diagram of the absolute value of the gain relative error between the calculated impedance value and the theoretical impedance value obtained using the existing inverter impedance measurement method. Referring to Figure 7, the calculated average absolute percentage error of the gain is 3.57%.
  • Figure 8 is a schematic diagram of the absolute value of the phase relative error between the calculated impedance value and the theoretical impedance value obtained using the existing inverter impedance measurement method. Referring to Figure 8, the calculated average absolute percentage error of the phase is 1.65%. It can be concluded from the above results that the accuracy of the calculated impedance value obtained by the existing inverter impedance measurement method is not high, and as the preset frequency increases, the error in the calculated impedance value gradually increases.
  • Figure 9 is a Bode diagram comparing the calculated impedance value and the theoretical impedance value obtained by using the inverter impedance measurement method provided by the embodiment of the present application. Refer to Figure 9. The curve represents the theoretical impedance value, and the discrete asterisk points represent the calculated impedance value. .
  • Figure 10 is a schematic diagram of the absolute value of the gain relative error between the calculated impedance value and the theoretical impedance value obtained using the inverter impedance measurement method provided by the embodiment of the present application. Referring to Figure 10, the calculated average absolute percentage error of the gain is 3.19% .
  • Figure 11 is a schematic diagram of the absolute value of the phase relative error between the calculated impedance value and the theoretical impedance value obtained by using the inverter impedance measurement method provided by the embodiment of the present application.
  • the calculated average absolute percentage error of the phase is 0.85%. . It can be concluded from the above results that the inverter impedance measurement method provided by the embodiment of the present application has higher accuracy in calculating the impedance value, effectively reduces the error, and improves the accuracy and reliability of the inverter impedance measurement.
  • FIG 12 is a schematic structural diagram of an inverter impedance measuring device provided by an embodiment of the present application.
  • the inverter impedance measurement device provided in this embodiment may include: an acquisition module 201, a first determination module 202, a second determination module 203 and a third determination module 204.
  • the acquisition module 201 is used to acquire the first disturbance voltage frequency domain signal and the first response current frequency domain signal when injecting the disturbance voltage of the first disturbance frequency into the inverter; acquire the first disturbance voltage frequency domain signal when injecting the second disturbance frequency into the inverter.
  • the second disturbance voltage frequency domain signal and the second response current frequency domain signal when the voltage is disturbed.
  • the first determination module 202 is used to determine the first disturbance voltage signal and the first response current signal according to the first disturbance voltage frequency domain signal and the first response current frequency domain signal; according to the second disturbance voltage frequency domain signal and the second response current
  • the frequency domain signal determines the second disturbance voltage signal and the second response current signal; the first disturbance frequency and the second disturbance frequency are frequencies on both sides of the preset frequency.
  • the second determination module 203 is configured to determine the first impedance of the first disturbance frequency according to the first disturbance voltage signal and the first response current signal, and determine the second impedance of the second disturbance frequency according to the second disturbance voltage signal and the second response current signal. impedance.
  • the third determining module 204 is used to determine the impedance of the preset frequency according to the first impedance and the second impedance.
  • the acquisition module 201 is specifically configured to: acquire the first disturbance voltage time domain signal and the first response current time domain signal when injecting the disturbance voltage of the first disturbance frequency into the inverter; acquire the first disturbance voltage time domain signal when injecting the second disturbance voltage into the inverter.
  • the second disturbance voltage time domain signal and the second response current time domain signal when the disturbance voltage is at the disturbance frequency perform discrete Fourier transform on the first disturbance voltage time domain signal and the first response current time domain signal respectively to obtain the first Disturbance voltage frequency domain signal and first response current frequency domain signal; perform discrete Fourier transform on the second disturbance voltage time domain signal and second response current time domain signal respectively to obtain the second disturbance voltage frequency domain signal and the second response Current frequency domain signal.
  • the disturbance voltage is a three-phase disturbance voltage.
  • the acquisition module 201 is also specifically configured to: according to the preset sampling frequency, obtain the first three-phase disturbance voltage time domain signal when the disturbance voltage of the first disturbance frequency is injected into the inverter. and the first three-phase response current time domain signal; according to the preset sampling frequency, obtain the second three-phase disturbance voltage time domain signal and the second three-phase response current time domain signal when the disturbance voltage of the second disturbance frequency is injected into the inverter. signal; conduct abc/ on the first three-phase disturbance voltage time domain signal and the first three-phase response current time domain signal respectively.
  • Coordinate transformation is performed to obtain the first disturbance voltage time domain signal after coordinate transformation and the first response current time domain signal after coordinate transformation; conduct the second three-phase disturbance voltage time domain signal and the second three-phase response current time domain signal respectively.
  • abc/ Coordinate transformation to obtain the second disturbance voltage time domain signal after coordinate transformation and the second response current time domain signal after coordinate transformation;
  • the first determination module 202 is specifically configured to: perform signal extraction on the first disturbance voltage frequency domain signal and the first response current frequency domain signal respectively, and determine the first disturbance voltage signal and the first response current of the first disturbance frequency. signal; perform signal extraction on the second disturbance voltage frequency domain signal and the second response current frequency domain signal respectively, and determine the second disturbance voltage signal and the second response current signal of the second disturbance frequency.
  • the third determination module 204 is specifically configured to perform an average calculation on the first impedance and the second impedance, and determine the impedance at the preset frequency.
  • the third determination module 204 is also specifically configured to: use multiple equally spaced target frequencies in the preset frequency sweep interval as preset frequencies in sequence, and perform the above steps of determining the impedance of the preset frequency to obtain the preset sweep frequency.
  • the third determination module 204 is also specifically configured to determine the corrected impedance of the target frequency based on the intersection value of the straight line corresponding to the first change slope and the straight line corresponding to the second change slope.
  • Figure 13 is a schematic structural diagram of a terminal device provided by an embodiment of the present application.
  • the terminal device 300 of this embodiment includes: a processor 310 and a memory 320.
  • the memory 320 stores a computer program 321 that can run on the processor 310.
  • the processor 310 executes the computer program 321, the steps in any of the above method embodiments are implemented, such as steps 101 to 104 shown in Figure 1 .
  • the processor 310 executes the computer program 321, it implements the functions of each module in each of the above device embodiments, such as the functions of the modules 201 to 204 shown in FIG. 12 .
  • the computer program 321 can be divided into one or more modules/units, and one or more modules/units are stored in the memory 320 and executed by the processor 310 to complete the present application.
  • the one or more modules/units may be a series of computer program instruction segments capable of completing specific functions.
  • the instruction segments are used to describe the execution process of the computer program 321 in the terminal device 300 .
  • Figure 13 is only an example of a terminal device and does not constitute a limitation on the terminal device. It may include more or fewer components than shown in the figure, or combine certain components, or different components, such as Input and output devices, network access devices, buses, etc.
  • the processor 310 can be a central processing unit (Central Processing Unit, CPU), or other general-purpose processor, digital signal processor (Digital Signal Processor, DSP), application specific integrated circuit (Application Specific Integrated Circuit, ASIC), or an off-the-shelf processor.
  • DSP Digital Signal Processor
  • ASIC Application Specific Integrated Circuit
  • FPGA Field-Programmable Gate Array
  • a general-purpose processor may be a microprocessor or the processor may be any conventional processor, etc.
  • the memory 320 can be an internal storage unit of the terminal device, such as a hard disk or memory of the terminal device, or an external storage device of the terminal device, such as a plug-in hard disk or smart memory card (SMC) equipped on the terminal device. , Secure Digital (SD) card, Flash Card, etc.
  • SMC smart memory card
  • the above-mentioned memory 320 may also include both an internal storage unit of the terminal device and an external storage device.
  • the above-mentioned memory 320 is used to store computer programs and other programs and data required by the terminal device.
  • the memory 320 may also be used to temporarily store data that has been output or is to be output.
  • Module completion means dividing the internal structure of the device into different functional units or modules to complete all or part of the functions described above.
  • Each functional unit and module in the embodiment can be integrated into one processing unit, or each unit can exist physically alone, or two or more units can be integrated into one unit.
  • the above-mentioned integrated unit can be hardware-based. It can also be implemented in the form of software functional units.
  • the specific names of each functional unit and module are only for the convenience of distinguishing each other and are not used to limit the scope of protection of the present application.
  • For the specific working processes of the units and modules in the above system please refer to the corresponding processes in the foregoing method embodiments, and will not be described again here.
  • the disclosed apparatus/terminal equipment and methods can be implemented in other ways.
  • the device/terminal equipment embodiments described above are only illustrative.
  • the division of modules or units is only a logical function division. In actual implementation, there may be other division methods, such as multiple units. Or components can be combined or can be integrated into another system, or some features can be omitted, or not implemented.
  • the coupling or direct coupling or communication connection between each other shown or discussed may be through some interfaces, indirect coupling or communication connection of devices or units, which may be in electrical, mechanical or other forms.
  • the units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place, or they may be distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.
  • each functional unit in various embodiments of the present invention can be integrated into one processing unit, or each unit can exist physically alone, or two or more units can be integrated into one unit.
  • the above integrated units can be implemented in the form of hardware or software functional units.
  • the integrated module/unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium.
  • the present invention can implement all or part of the processes in the methods of the above embodiments, and can also be completed by instructing relevant hardware through a computer program.
  • the computer program can be stored in a computer-readable storage medium, and the computer program can be stored in a computer-readable storage medium.
  • the computer program includes computer program code, which may be in the form of source code, object code, executable file or some intermediate form.
  • the computer-readable medium may include: any entity or device capable of carrying the computer program code, recording media, U disk, mobile hard disk, magnetic disk, optical disk, computer memory, read-only memory (ROM, Read-Only Memory) , Random Access Memory (RAM, Random Access Memory), electrical carrier signals, telecommunications signals, and software distribution media, etc.

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Abstract

一种逆变器阻抗测量方法、装置、终端设备及存储介质，属于阻抗测量技术领域。该方法包括：获取为逆变器注入第一扰动频率的扰动电压时的扰动电压频域信号和响应电流频域信号；获取为逆变器注入第二扰动频率的扰动电压时的扰动电压频域信号和响应电流频域信号（101）；根据上述扰动电压频域信号和响应电流频域信号确定第一扰动电压信号和第一响应电流信号，以及第二扰动电压信号和第二响应电流信号（102）；根据上述扰动电压信号和响应电流信号确定第一扰动频率的第一阻抗，以及第二扰动频率的第二阻抗（103）；根据第一阻抗和第二阻抗确定预设频率的阻抗（104）。能够提高对逆变器阻抗测量的精度，进而提高后续对逆变器的动态特性分析的准确性。

Description

逆变器阻抗测量方法、装置、终端设备及存储介质 技术领域
本申请涉及阻抗测量技术领域，具体涉及一种逆变器阻抗测量方法、装置、终端设备及存储介
 背景技术
电力电子设备例如逆变器等具有灵活可控的优点，可以显著增强电力系统的调控能力，大量新型设备通过电力电子设备接入电网输配电网络，电网电力电子化程度不断提高。
然而，电力电子设备动态特性复杂，非线性程度强，给电力电子化电力系统的暂态稳定分析带来了严峻的挑战，因此，对电力电子设备在电网中的动态特性的研究十分重要。端口阻抗能够较全面表征电力电子设备例如逆变器的动态特征，可以利用阻抗结果分析逆变器的动态特性。
现有的阻抗测量方法通常在逆变器端口施加扰动，并直接将扫频点对应的测量结果作为阻抗结果，而由于电力系统的不确定性较高，导致上述方法得到的阻抗结果的精度较低，进而降低了后续对逆变器的动态特性分析的准确性。
 发明内容
有鉴于此，本申请实施例提供了一种逆变器阻抗测量方法、装置、终端设备及存储介质，以解决现有的逆变器阻抗测量方法的测量精度较低，进而降低了后续对逆变器的动态特性分析的准确性的技术问题。
第一方面，本申请实施例提供了一种逆变器阻抗测量方法，包括：获取为逆变器注入第一扰动频率的扰动电压时的第一扰动电压频域信号和第一响应电流频域信号；获取为逆变器注入第二扰动频率的扰动电压时的第二扰动电压频域信号和第二响应电流频域信号；根据第一扰动电压频域信号和第一响应电流频域信号确定第一扰动电压信号和第一响应电流信号；根据第二扰动电压频域信号和第二响应电流频域信号确定第二扰动电压信号和第二响应电流信号；第一扰动频率和第二扰动频率为预设频率两侧的频率；根据第一扰动电压信号和第一响应电流信号确定第一扰动频率的第一阻抗，根据第二扰动电压信号和第二响应电流信号确定第二扰动频率的第二阻抗；根据第一阻抗和第二阻抗确定预设频率的阻抗。
在第一方面的一种可能的实施方式中，获取为逆变器注入第一扰动频率的扰动电压时的第一扰动电压频域信号和第一响应电流频域信号；获取为逆变器注入第二扰动频率的扰动电压时的第二扰动电压频域信号和第二响应电流频域信号，包括：获取为逆变器注入第一扰动频率的扰动电压时的第一扰动电压时域信号和第一响应电流时域信号；获取为逆变器注入第二扰动频率的扰动电压时的第二扰动电压时域信号和第二响应电流时域信号；分别对第一扰动电压时域信号和第一响应电流时域信号进行离散傅里叶变换，得到第一扰动电压频域信号和第一响应电流频域信号；分别对第二扰动电压时域信号和第二响应电流时域信号进行离散傅里叶变换，得到第二扰动电压频域信号和第二响应电流频域信号。
在第一方面的一种可能的实施方式中，扰动电压为三相扰动电压；获取为逆变器注入第一扰动频率的扰动电压时的第一扰动电压时域信号和第一响应电流时域信号；获取为逆变器注入第二扰动频率的扰动电压时的第二扰动电压时域信号和第二响应电流时域信号，包括：根据预设采样频率，获取为逆变器注入第一扰动频率的扰动电压时的第一三相扰动电压时域信号和第一三相响应电流时域信号；根据预设采样频率，获取为逆变器注入第二扰动频率的扰动电压时的第二三相扰动电压时域信号和第二三相响应电流时域信号；分别对第一三相扰动电压时域信号和第一三相响应电流时域信号进行abc/ 坐标变换，得到坐标变换后的第一扰动电压时域信号和坐标变换后的第一响应电流时域信号；分别对第二三相扰动电压时域信号和第二三相响应电流时域信号进行abc/ 坐标变换，得到坐标变换后的第二扰动电压时域信号和坐标变换后的第二响应电流时域信号；
相应的，分别对第一扰动电压时域信号和第一响应电流时域信号进行离散傅里叶变换，得到第一扰动电压频域信号和第一响应电流频域信号；分别对第二扰动电压时域信号和第二响应电流时域信号进行离散傅里叶变换，得到第二扰动电压频域信号和第二响应电流频域信号，包括：分别对坐标变换后的第一扰动电压时域信号和坐标变换后的第一响应电流时域信号进行离散傅里叶变换，得到第一扰动电压频域信号和第一响应电流频域信号；分别对坐标变换后的第二扰动电压时域信号和坐标变换后的第二响应电流时域信号进行离散傅里叶变换，得到第二扰动电压频域信号和第二响应电流频域信号。
在第一方面的一种可能的实施方式中，根据第一扰动电压频域信号和第一响应电流频域信号确定第一扰动电压信号和第一响应电流信号；根据第二扰动电压频域信号和第二响应电流频域信号确定第二扰动电压信号和第二响应电流信号，包括：分别对第一扰动电压频域信号和第一响应电流频域信号进行信号提取，确定第一扰动频率的第一扰动电压信号和第一响应电流信号；分别对第二扰动电压频域信号和第二响应电流频域信号进行信号提取，确定第二扰动频率的第二扰动电压信号和第二响应电流信号。
在第一方面的一种可能的实施方式中，根据第一阻抗和第二阻抗确定预设频率的阻抗，包括：对第一阻抗和第二阻抗进行均值计算，确定预设频率的阻抗。
在第一方面的一种可能的实施方式中，逆变器阻抗测量方法还包括：将预设扫频区间的多个等间距的目标频率依次作为预设频率，执行上述对预设频率的阻抗的确定步骤，得到预设扫频区间内的各个等间距的目标频率的阻抗；针对预设扫频区间内的每个等间距的目标频率，确定该目标频率在预设扫频区间内的相邻的第一频率和第二频率；根据第一频率的扰动频率的阻抗和该目标频率的扰动频率的阻抗确定第一变化斜率；根据第二频率的扰动频率的阻抗和该目标频率的扰动频率的阻抗确定第二变化斜率；判断第一变化斜率和第二变化斜率之差的绝对值是否大于预设阈值，若是，则对该目标频率的阻抗进行校正。
在第一方面的一种可能的实施方式中，在第一变化斜率和第二变化斜率之差的绝对值大于预设阈值时，对该目标频率的阻抗进行校正，包括：根据第一变化斜率对应的直线与第二变化斜率对应的直线的交点的取值，确定该目标频率的校正后的阻抗。
第二方面，本申请实施例提供了一种逆变器阻抗测量装置，包括：
获取模块，用于获取为逆变器注入第一扰动频率的扰动电压时的第一扰动电压频域信号和第一响应电流频域信号；获取为逆变器注入第二扰动频率的扰动电压时的第二扰动电压频域信号和第二响应电流频域信号。
第一确定模块，用于根据第一扰动电压频域信号和第一响应电流频域信号确定第一扰动电压信号和第一响应电流信号；根据第二扰动电压频域信号和第二响应电流频域信号确定第二扰动电压信号和第二响应电流信号；第一扰动频率和第二扰动频率为预设频率两侧的频率。
第二确定模块，用于根据第一扰动电压信号和第一响应电流信号确定第一扰动频率的第一阻抗，根据第二扰动电压信号和第二响应电流信号确定第二扰动频率的第二阻抗。
第三确定模块，用于根据第一阻抗和第二阻抗确定预设频率的阻抗。
第三方面，本申请实施例提供了一种终端设备，包括存储器和处理器，存储器中存储有可在处理器上运行的计算机程序，处理器执行计算机程序时实现如第一方面任一项所述的逆变器阻抗测量方法。
第四方面，本申请实施例提供了一种计算机可读存储介质，计算机可读存储介质存储有计算机程序，计算机程序被处理器执行时实现如第一方面任一项所述的逆变器阻抗测量方法。
第五方面，本申请实施例提供了一种计算机程序产品，当计算机程序产品在终端设备上运行时，使得终端设备执行上述第一方面中任一项所述的逆变器阻抗测量方法。
可以理解的是，上述第二方面至第五方面的有益效果可以参见上述第一方面中的相关描述，在此不再赘述。
本申请实施例提供的逆变器阻抗测量方法、装置、终端设备及存储介质，通过获取为逆变器注入第一扰动频率的扰动电压时的第一扰动电压频域信号和第一响应电流频域信号，以及为逆变器注入第二扰动频率的扰动电压时的第二扰动电压频域信号和第二响应电流频域信号，根据上述扰动电压频域信号和响应电流频域信号确定第一扰动电压信号和第一响应电流信号，以及确定第二扰动电压信号和第二响应电流信号，其中，第一扰动频率和第二扰动频率为预设频率两侧的频率，根据上述扰动电压信号和响应电流信号确定第一扰动频率的第一阻抗，以及确定第二扰动频率的第二阻抗，根据第一阻抗和第二阻抗确定预设频率的阻抗，对预设频率两侧的扰动频率的阻抗做均值计算并将该均值作为预设频率的阻抗，可以提高预设频率的阻抗的精度，即能够提高对逆变器阻抗测量的精度，进而提高后续对逆变器的动态特性分析的准确性。
应当理解的是，以上的一般描述和后文的细节描述仅是示例性和解释性的，并不能限制本说明书。
 附图说明
为了更清楚地说明本申请实施例中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本申请的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动性的前提下，还可以根据这些附图获得其他的附图。
图1是本申请一实施例提供的逆变器阻抗测量方法的流程示意图；
图2是本申请一实施例提供的逆变器与扰动电压源的电路连接示意图；
图3是本申请另一实施例提供的逆变器阻抗测量方法的流程示意图；
图4是本申请再一实施例提供的逆变器阻抗测量方法的流程示意图；
图5是本申请又一实施例提供的逆变器阻抗测量方法的流程示意图；
图6是采用现有的逆变器阻抗测量方法得到的计算阻抗值与理论阻抗值的对比伯德图；
图7是采用现有的逆变器阻抗测量方法得到的计算阻抗值与理论阻抗值的增益相对误差的绝对值的示意图；
图8是采用现有的逆变器阻抗测量方法得到的计算阻抗值与理论阻抗值的相位相对误差的绝对值的示意图；
图9是采用本申请实施例提供的逆变器阻抗测量方法得到的计算阻抗值与理论阻抗值的对比伯德图；
图10是采用本申请实施例提供的逆变器阻抗测量方法得到的计算阻抗值与理论阻抗值的增益相对误差的绝对值的示意图；
图11是采用本申请实施例提供的逆变器阻抗测量方法得到的计算阻抗值与理论阻抗值的相位相对误差的绝对值的示意图；
图12是本申请一实施例提供的逆变器阻抗测量装置的结构示意图；
图13是本申请一实施例提供的终端设备的结构示意图。
 实施方式
下面结合具体实施例对本申请进行更清楚的说明。以下实施例将有助于本领域的技术人员进一步理解本申请的作用，但不以任何形式限制本申请。应当指出的是，对本领域的普通技术人员来说，在不脱离本申请构思的前提下，还可以做出若干变形和改进。这些都属于本申请的保护范围。
应当理解，当在本申请说明书和所附权利要求书中使用时，术语“包括”指示所描述特征、整体、步骤、操作、元素和/或组件的存在，但并不排除一个或多个其它特征、整体、步骤、操作、元素、组件和/或其集合的存在或添加。
还应当理解，在本申请说明书和所附权利要求书中使用的术语“和/或”是指相关联列出的项中的一个或多个的任何组合以及所有可能组合，并且包括这些组合。
在本申请说明书和所附权利要求书的描述中，术语“第一”、“第二”、“第三”等仅用于区分描述，而不能理解为指示或暗示相对重要性。
在本申请说明书中描述的参考“一个实施例”或“一些实施例”等意味着在本申请的一个或多个实施例中包括结合该实施例描述的特定特征、结构或特点。由此，在本说明书中的不同之处出现的语句“在一个实施例中”、“在一些实施例中”、“在其他一些实施例中”、“在另外一些实施例中”等不是必然都参考相同的实施例，而是意味着“一个或多个但不是所有的实施例”，除非是以其他方式另外特别强调。术语“包括”、“包含”、“具有”及它们的变形都意味着“包括但不限于”，除非是以其他方式另外特别强调。
此外，本申请实施例中提到的“多个”应当被解释为两个或两个以上。
电力电子设备例如逆变器等具有灵活可控的优点，可以显著增强电力系统的调控能力，大量新型设备通过电力电子设备接入电网输配电网络，电网电力电子化程度不断提高。然而，电力电子设备动态特性复杂，非线性程度强，给电力电子化电力系统的暂态稳定分析带来了严峻的挑战，并网引起电力系统振荡等问题逐步显现。因此，对电力电子设备在电网中的动态特性的研究十分重要。
端口阻抗能够较全面表征电力电子设备例如逆变器的动态特征，可以利用阻抗结果分析逆变器的动态特性。现有的阻抗测量方法通常在逆变器端口施加扰动，并直接将扫频点对应的测量结果作为阻抗结果，而由于电力系统的不确定性较高，导致上述方法得到的阻抗结果的精度较低，进而降低了后续对逆变器的动态特性分析的准确性。
基于上述问题，发明人经研究发现，可以通过对逆变器注入扰动电压，并测量预设频率两侧的扰动频率的阻抗，并对上述阻抗做均值计算作为该预设频率的阻抗，能够提高对逆变器阻抗测量的精度，并进一步对得到的预设频率的阻抗进行是否需要校正的判断，在需要校正时对预设频率的阻抗进行校正，进一步保证逆变器阻抗测量的结果的可靠性。
也就是说，本申请实施例提供的逆变器阻抗测量方法中，获取为逆变器注入第一扰动频率的扰动电压时的第一扰动电压频域信号和第一响应电流频域信号，以及为逆变器注入第二扰动频率的扰动电压时的第二扰动电压频域信号和第二响应电流频域信号，根据上述扰动电压频域信号和响应电流频域信号确定第一扰动电压信号和第一响应电流信号，以及确定第二扰动电压信号和第二响应电流信号，其中，第一扰动频率和第二扰动频率为预设频率两侧的频率，根据上述扰动电压信号和响应电流信号确定第一扰动频率的第一阻抗，以及确定第二扰动频率的第二阻抗，根据第一阻抗和第二阻抗确定预设频率的阻抗，通过对预设频率两侧的扰动频率的阻抗做均值计算并将该均值作为预设频率的阻抗，可以提高预设频率的阻抗的精度，即能够提高对逆变器阻抗测量的精度，进而提高后续对逆变器的动态特性分析的准确性。
图1是本申请一实施例提供的逆变器阻抗测量方法的流程示意图。如图1所示，本申请实施例中的方法，可以包括：
步骤101、获取为逆变器注入第一扰动频率的扰动电压时的第一扰动电压频域信号和第一响应电流频域信号，获取为逆变器注入第二扰动频率的扰动电压时的第二扰动电压频域信号和第二响应电流频域信号。
图2是本申请一实施例提供的逆变器与扰动电压源的电路连接示意图。如图2所示，逆变器为三相逆变器，是待测量逆变器，在对该逆变器进行阻抗测量时，该逆变器处于离线状态，且与离线测试电压源连接，该离线测试电压源为三相电压源，用于为逆变器供电。在逆变器与离线测试电压源之间串入扰动电压源，该扰动电压源为三相扰动电压源，用于为逆变器提供预设扫频区间内不同频率的扰动电压，该扰动电压为三相扰动电压。
可选的，第一扰动频率和第二扰动频率为预设频率两侧的频率。其中，该预设频率为预设扫频区间的多个等间距的频率，本申请实施例中对上述多个预设频率的阻抗进行测量，也就是测量逆变器在该预设频率下的阻抗。第一扰动频率和第二扰动频率分别为该预设频率两侧的频率，例如，预设扫频区间可以设置为中频段[500Hz，5000Hz]，则该预设扫频区间内的预设频率可以设置为500Hz、600Hz、700Hz、 、4900Hz、5000Hz共46个预设频率，而每个预设频率的第一扰动频率和第二扰动频率可以设置为该预设频率 10Hz的频率，例如，预设频率为600Hz，则该预设频率对应的第一扰动频率为590 Hz，第二扰动频率为610 Hz，也就是说，对应46个预设频率共有92个扰动频率。
需要注意的是，上述预设扫频区间、预设频率以及对应的第一扰动频率和第二扰动频率的数值可以根据具体情况设置，在此不做具体限制。
在一些实施例中，参见图3，步骤101中，具体可以包括：
步骤1011、获取为逆变器注入第一扰动频率的扰动电压时的第一扰动电压时域信号和第一响应电流时域信号，获取为逆变器注入第二扰动频率的扰动电压时的第二扰动电压时域信号和第二响应电流时域信号。
可选的，为保证获取的时域信号的稳定性，在注入扰动电压的最后一个扰动周期获取对应的时域信号。具体来说，为逆变器注入第一扰动频率的扰动电压时，获取该扰动电压下最后一个扰动周期的第一扰动电压时域信号和第一响应电流时域信号。为逆变器注入第二扰动频率的扰动电压时，获取该扰动电压下最后一个扰动周期的第二扰动电压时域信号和第二响应电流时域信号。
步骤1012、分别对第一扰动电压时域信号和第一响应电流时域信号进行离散傅里叶变换，得到第一扰动电压频域信号和第一响应电流频域信号，分别对第二扰动电压时域信号和第二响应电流时域信号进行离散傅里叶变换，得到第二扰动电压频域信号和第二响应电流频域信号。
可选的，获取的时域信号中包括基波频率对应的信号以及扰动频率对应的信号，因此需要对上述时域信号进行离散傅里叶变换得到对应的频域信号，进而从频域信号中提取扰动频率对应的信号。
具体来说，对第一扰动电压时域信号进行离散傅里叶变换，得到第一扰动电压频域信号，对第一响应电流时域信号进行离散傅里叶变换，得到第一响应电流频域信号。对第二扰动电压时域信号进行离散傅里叶变换，得到第二扰动电压频域信号，对第二响应电流时域信号进行离散傅里叶变换，得到第二响应电流频域信号。
在一种可能的实施方式中，步骤1011中，具体可以包括：
步骤S1、根据预设采样频率，获取为逆变器注入第一扰动频率的扰动电压时的第一三相扰动电压时域信号和第一三相响应电流时域信号。
步骤S2、根据预设采样频率，获取为逆变器注入第二扰动频率的扰动电压时的第二三相扰动电压时域信号和第二三相响应电流时域信号。
步骤S3、分别对第一三相扰动电压时域信号和第一三相响应电流时域信号进行abc/ 坐标变换，得到坐标变换后的第一扰动电压时域信号和坐标变换后的第一响应电流时域信号。
步骤S4、分别对第二三相扰动电压时域信号和第二三相响应电流时域信号进行abc/ 坐标变换，得到坐标变换后的第二扰动电压时域信号和坐标变换后的第二响应电流时域信号。
其中，根据预设采样频率获取相应的时域信号，则得到的时域信号为离散信号，预设采样频率可以根据具体情况设置，例如，可以以采样间隔为5Hz来获取时域信号。
可选的，扰动电压为三相扰动电压，获取到的为逆变器注入第一扰动频率的扰动电压时的第一扰动电压时域信号包括第一三相扰动电压时域信号，获取到的第一响应电流时域信号包括第一三相响应电流时域信号。获取到的为逆变器注入第二扰动频率的扰动电压时的第二扰动电压时域信号包括第二三相扰动电压时域信号，获取到的第二响应电流时域信号包括第二三相响应电流时域信号。
示例性的，三相扰动电压时域信号可以表示为：
三相响应电流时域信号可以表示为：
其中， 、 和 为三相扰动电压时域信号， 、 和 为三相响应电流时域信号， 为扰动电压的幅值，例如扰动电压的幅值可以为10V， 为响应电流的幅值， 为扰动频率。
对三相扰动电压时域信号进行abc/ 坐标变换，得到坐标变换后的扰动电压时域信号，具体可以表示为：
对三相响应电流时域信号进行abc/ 坐标变换，得到坐标变换后的响应电流时域信号，具体可以表示为：
式中， 和 为三相扰动电压时域信号在 静止坐标系下的值， 为坐标变换后的扰动电压时域信号。 和 为三相响应电流时域信号在 静止坐标系下的值， 为坐标变换后的响应电流时域信号。
具体来说，根据上述abc/ 坐标变换公式，对第一三相扰动电压时域信号进行abc/ 坐标变换，得到坐标变换后的第一扰动电压时域信号，对第一三相响应电流时域信号进行abc/ 坐标变换，得到坐标变换后的第一响应电流时域信号。对第二三相扰动电压时域信号进行abc/ 坐标变换，得到坐标变换后的第二扰动电压时域信号，对第二三相响应电流时域信号进行abc/ 坐标变换，得到坐标变换后的第二响应电流时域信号。
相应的，步骤1012中，具体可以包括：
步骤S11、分别对坐标变换后的第一扰动电压时域信号和坐标变换后的第一响应电流时域信号进行离散傅里叶变换，得到第一扰动电压频域信号和第一响应电流频域信号。
步骤S12、分别对坐标变换后的第二扰动电压时域信号和坐标变换后的第二响应电流时域信号进行离散傅里叶变换，得到第二扰动电压频域信号和第二响应电流频域信号。
示例性的，对坐标变换后的时域信号进行离散傅里叶变换，得到频域信号，具体可以表示为：
式中， 为坐标变换后的时域信号，是离散信号，其中 表示第 个离散点， 为坐标变换后的时域信号的长度， 为频域信号，也是离散信号，其中 表示第 个离散点。
具体来说，根据上述离散傅里叶变换公式，对坐标变换后的第一扰动电压时域信号进行离散傅里叶变换，得到第一扰动电压频域信号，对坐标变换后的第一响应电流时域信号进行离散傅里叶变换，得到第一响应电流频域信号。对坐标变换后的第二扰动电压时域信号进行离散傅里叶变换，得到第二扰动电压频域信号，对坐标变换后的第二响应电流时域信号进行离散傅里叶变换，得到第二响应电流频域信号。
步骤102、根据第一扰动电压频域信号和第一响应电流频域信号确定第一扰动电压信号和第一响应电流信号，根据第二扰动电压频域信号和第二响应电流频域信号确定第二扰动电压信号和第二响应电流信号。
在一种可能的实施方式中，步骤102中，参见图4，具体可以包括：
步骤1021、分别对第一扰动电压频域信号和第一响应电流频域信号进行信号提取，确定第一扰动频率的第一扰动电压信号和第一响应电流信号。
步骤1022、分别对第二扰动电压频域信号和第二响应电流频域信号进行信号提取，确定第二扰动频率的第二扰动电压信号和第二响应电流信号。
可选的，从频域信号中提取扰动频率对应的信号。具体来说，对第一扰动电压频域信号进行信号提取，确定第一扰动频率的第一扰动电压信号，对第一响应电流频域信号进行信号提取，确定第一扰动频率的第一响应电流信号。对第二扰动电压频域信号进行信号提取，确定第二扰动频率的第二扰动电压信号，对第二响应电流频域信号进行信号提取，确定第二扰动频率的第二响应电流信号。
步骤103、根据第一扰动电压信号和第一响应电流信号确定第一扰动频率的第一阻抗，根据第二扰动电压信号和第二响应电流信号确定第二扰动频率的第二阻抗。
可选的，阻抗计算公式为：
式中， 为第一扰动频率， 为第二扰动频率， 为第一阻抗， 为第二阻抗， 为第一扰动电压信号， 为第一响应电流信号， 为第二扰动电压信号， 为第二响应电流信号。
步骤104、根据第一阻抗和第二阻抗确定预设频率的阻抗。
在一种可能的实施方式中，步骤104中，具体可以包括：对第一阻抗和第二阻抗进行均值计算，确定预设频率的阻抗。
可选的，预设频率的阻抗可以表示为：
式中， 为预设频率， 为预设频率的阻抗。
需要说明的是，根据预设扫频区间内的预设频率，确定每个预设频率的第一扰动频率和第二扰动频率，根据上述扰动频率为逆变器注入不同频率的扰动电压，并重复步骤101~104，确定预设扫频区间内每个预设频率的阻抗，以根据上述多个预设频率及预设频率的阻抗对逆变器的动态特性进行分析。
通过对预设频率两侧的第一扰动频率和第二扰动频率的阻抗进行计算，并对第一扰动频率的阻抗和第二扰动频率的阻抗进行均值计算，将该均值作为预设频率的阻抗，可以提高预设频率的阻抗的精度，即能够提高对逆变器阻抗测量的精度，进而提高后续对逆变器的动态特性分析的准确性。
在一种可能的实施方式中，为进一步提高预设频率的阻抗的精度，还可以对计算得到的预设频率的阻抗进行是否需要校正的判断，以及在需要校正时对该预设频率的阻抗进行校正，参见图5，本申请实施例提供的逆变器阻抗测量方法，还可以包括：
步骤105、将预设扫频区间的多个等间距的目标频率依次作为预设频率，执行上述对预设频率的阻抗的确定步骤，得到预设扫频区间内的各个等间距的目标频率的阻抗。
具体来说，将预设扫频区间的多个等间距的目标频率依次作为预设频率，确定预设频率的第一扰动频率和第二扰动频率，根据上述扰动频率为逆变器注入不同频率的扰动电压，并执行步骤101~104，得到预设扫频区间内的各个等间距的目标频率的阻抗。
本实施例中步骤105的具体实现过程和原理可以参见前述实施例，此处不再赘述。
步骤106、针对预设扫频区间内的每个等间距的目标频率，确定该目标频率在预设扫频区间内的相邻的第一频率和第二频率；根据第一频率的扰动频率的阻抗和该目标频率的扰动频率的阻抗确定第一变化斜率；根据第二频率的扰动频率的阻抗和该目标频率的扰动频率的阻抗确定第二变化斜率；判断第一变化斜率和第二变化斜率之差的绝对值是否大于预设阈值，若是，则对该目标频率的阻抗进行校正。
需要说明的是，目标频率在预设扫频区间内的相邻的第一频率和第二频率，分别为预设扫频区间内的与该目标频率相邻的其他两个目标频率，例如，当预设扫频区间设置为中频段[500Hz，5000Hz]时，取目标频率为700Hz，则该目标频率在预设扫频区间内的相邻的第一频率和第二频率分别为600 Hz和800Hz。
示例性的，具体来说，根据第一频率的第二扰动频率的阻抗和该目标频率的第一扰动频率的阻抗确定第一变化斜率，根据第二频率的第一扰动频率的阻抗和该目标频率的第二扰动频率的阻抗确定第二变化斜率。
变化斜率计算公式可以表示为：
式中， 为第一变化斜率， 为第二变化斜率， 为目标频率 的第一扰动频率 的阻抗， 为目标频率的第二扰动频率 的阻抗， 为第一频率的第二扰动频率 的阻抗， 为第二频率的第一扰动频率 的阻抗。
判断 是否大于预设阈值，其中，该预设阈值可以取 ，若 大于预设阈值 ，则此时可能存在极点，需要对该目标频率的阻抗进行校正。
一个简单的示例是，当预设扫频区间设置为中频段[500Hz，5000Hz]时，取目标频率为700Hz，则该目标频率在预设扫频区间内的相邻的第一频率和第二频率分别为600 Hz和800Hz，第一频率的第一扰动频率为590 Hz、第二扰动频率为610 Hz，第二频率的第一扰动频率为790 Hz、第二扰动频率为810 Hz，该目标频率的第一扰动频率为690 Hz、第二扰动频率为710 Hz。
需要说明的是，若目标频率是预设扫频区间的端点时，可以不对目标频率的阻抗进行校正。
其中可选的，步骤106中在第一变化斜率和第二变化斜率之差的绝对值大于预设阈值时，对该目标频率的阻抗进行校正的步骤，具体可以包括：根据第一变化斜率对应的直线与第二变化斜率对应的直线的交点的取值，确定该目标频率的校正后的阻抗。
示例性的，第一变化斜率对应的直线与第二变化斜率对应的直线可以分别表示为：
计算第一变化斜率对应的直线与第二变化斜率对应的直线的交点的值作为目标频率的校正后的阻抗，即作为目标频率的最终阻抗：
式中， 为目标频率 的最终阻抗，即目标频率 的校正后的阻抗。
通过确定目标频率在预设扫频区间内的相邻的第一频率和第二频率，并根据第一频率的第二扰动频率的阻抗和该目标频率的第一扰动频率的阻抗确定第一变化斜率，以及根据第二频率的第一扰动频率的阻抗和该目标频率的第二扰动频率的阻抗确定第二变化斜率，根据上述变化斜率判断目标频率的阻抗是否需要校正，以及在需要校正时对该目标频率的阻抗进行校正，能够进一步保证逆变器阻抗测量的结果的可靠性。
本申请实施例提供的一种逆变器阻抗测量方法，通过获取为逆变器注入第一扰动频率的扰动电压时的第一扰动电压频域信号和第一响应电流频域信号，以及为逆变器注入第二扰动频率的扰动电压时的第二扰动电压频域信号和第二响应电流频域信号，根据上述扰动电压频域信号和响应电流频域信号确定第一扰动电压信号和第一响应电流信号，以及确定第二扰动电压信号和第二响应电流信号，其中，第一扰动频率和第二扰动频率为预设频率两侧的频率，根据上述扰动电压信号和响应电流信号确定第一扰动频率的第一阻抗，以及确定第二扰动频率的第二阻抗，根据第一阻抗和第二阻抗确定预设频率的阻抗，对预设频率两侧的扰动频率的阻抗做均值计算并将该均值作为预设频率的阻抗，可以提高预设频率的阻抗的精度，即能够提高对逆变器阻抗测量的精度，进而提高后续对逆变器的动态特性分析的准确性。
对得到的预设频率的阻抗进行是否需要校正的判断，并在需要校正时对预设频率的阻抗进行校正，进一步保证逆变器阻抗测量的结果的可靠性。
应理解，上述实施例中各步骤的序号的大小并不意味着执行顺序的先后，各过程的执行顺序应以其功能和内在逻辑确定，而不应对本申请实施例的实施过程构成任何限定。
以下，为验证本申请实施例提供的逆变器阻抗测量方法的准确性和有效性，在Matlab平台或Simulink平台中搭建逆变器阻抗测试模型以计算预设频率的阻抗的理论值，称为理论阻抗值，而将根据逆变器阻抗测量方法得到的预设频率的阻抗称为计算阻抗值，其中，上述逆变器阻抗测量方法可以包括本申请实施例提供的逆变器阻抗测量方法，并采用Matlab平台对上述理论阻抗值和计算阻抗值进行对比分析。
图6是采用现有的逆变器阻抗测量方法得到的计算阻抗值与理论阻抗值的对比伯德图，参见图6，曲线表示理论阻抗值，离散的星号点表示计算阻抗值。图7是采用现有的逆变器阻抗测量方法得到的计算阻抗值与理论阻抗值的增益相对误差的绝对值的示意图，参见图7，计算得到增益平均绝对百分误差为3.57%。图8是采用现有的逆变器阻抗测量方法得到的计算阻抗值与理论阻抗值的相位相对误差的绝对值的示意图，参见图8，计算得到相位平均绝对百分误差为1.65%。由以上结果可以得出，现有的逆变器阻抗测量方法得到的计算阻抗值的精度不高，且随着预设频率的增大，计算阻抗值的误差逐渐增大。
图9是采用本申请实施例提供的逆变器阻抗测量方法得到的计算阻抗值与理论阻抗值的对比伯德图，参见图9，曲线表示理论阻抗值，离散的星号点表示计算阻抗值。图10是采用本申请实施例提供的逆变器阻抗测量方法得到的计算阻抗值与理论阻抗值的增益相对误差的绝对值的示意图，参见图10，计算得到增益平均绝对百分误差为3.19%。图11是采用本申请实施例提供的逆变器阻抗测量方法得到的计算阻抗值与理论阻抗值的相位相对误差的绝对值的示意图，参见图11，计算得到相位平均绝对百分误差为0.85%。由以上结果可以得出，本申请实施例提供的逆变器阻抗测量方法得到的计算阻抗值的精度较高，误差有效降低，提高了对逆变器阻抗测量的精度和可靠性。
图12是本申请一实施例提供的逆变器阻抗测量装置的结构示意图。如图12所示，本实施例提供的逆变器阻抗测量装置，可以包括：获取模块201、第一确定模块202、第二确定模块203和第三确定模块204。
其中，获取模块201，用于获取为逆变器注入第一扰动频率的扰动电压时的第一扰动电压频域信号和第一响应电流频域信号；获取为逆变器注入第二扰动频率的扰动电压时的第二扰动电压频域信号和第二响应电流频域信号。
第一确定模块202，用于根据第一扰动电压频域信号和第一响应电流频域信号确定第一扰动电压信号和第一响应电流信号；根据第二扰动电压频域信号和第二响应电流频域信号确定第二扰动电压信号和第二响应电流信号；第一扰动频率和第二扰动频率为预设频率两侧的频率。
第二确定模块203，用于根据第一扰动电压信号和第一响应电流信号确定第一扰动频率的第一阻抗，根据第二扰动电压信号和第二响应电流信号确定第二扰动频率的第二阻抗。
第三确定模块204，用于根据第一阻抗和第二阻抗确定预设频率的阻抗。
可选的，获取模块201具体用于：获取为逆变器注入第一扰动频率的扰动电压时的第一扰动电压时域信号和第一响应电流时域信号；获取为逆变器注入第二扰动频率的扰动电压时的第二扰动电压时域信号和第二响应电流时域信号；分别对第一扰动电压时域信号和第一响应电流时域信号进行离散傅里叶变换，得到第一扰动电压频域信号和第一响应电流频域信号；分别对第二扰动电压时域信号和第二响应电流时域信号进行离散傅里叶变换，得到第二扰动电压频域信号和第二响应电流频域信号。
可选的，扰动电压为三相扰动电压，获取模块201还具体用于：根据预设采样频率，获取为逆变器注入第一扰动频率的扰动电压时的第一三相扰动电压时域信号和第一三相响应电流时域信号；根据预设采样频率，获取为逆变器注入第二扰动频率的扰动电压时的第二三相扰动电压时域信号和第二三相响应电流时域信号；分别对第一三相扰动电压时域信号和第一三相响应电流时域信号进行abc/ 坐标变换，得到坐标变换后的第一扰动电压时域信号和坐标变换后的第一响应电流时域信号；分别对第二三相扰动电压时域信号和第二三相响应电流时域信号进行abc/ 坐标变换，得到坐标变换后的第二扰动电压时域信号和坐标变换后的第二响应电流时域信号；
分别对坐标变换后的第一扰动电压时域信号和坐标变换后的第一响应电流时域信号进行离散傅里叶变换，得到第一扰动电压频域信号和第一响应电流频域信号；分别对坐标变换后的第二扰动电压时域信号和坐标变换后的第二响应电流时域信号进行离散傅里叶变换，得到第二扰动电压频域信号和第二响应电流频域信号。
可选的，第一确定模块202具体用于：分别对第一扰动电压频域信号和第一响应电流频域信号进行信号提取，确定第一扰动频率的第一扰动电压信号和第一响应电流信号；分别对第二扰动电压频域信号和第二响应电流频域信号进行信号提取，确定第二扰动频率的第二扰动电压信号和第二响应电流信号。
可选的，第三确定模块204具体用于：对第一阻抗和第二阻抗进行均值计算，确定预设频率的阻抗。
可选的，第三确定模块204还具体用于：将预设扫频区间的多个等间距的目标频率依次作为预设频率，执行上述对预设频率的阻抗的确定步骤，得到预设扫频区间内的各个等间距的目标频率的阻抗；针对预设扫频区间内的每个等间距的目标频率，确定该目标频率在预设扫频区间内的相邻的第一频率和第二频率；根据第一频率的扰动频率的阻抗和该目标频率的扰动频率的阻抗确定第一变化斜率；根据第二频率的扰动频率的阻抗和该目标频率的扰动频率的阻抗确定第二变化斜率；判断第一变化斜率和第二变化斜率之差的绝对值是否大于预设阈值，若是，则对该目标频率的阻抗进行校正。
可选的，第三确定模块204还具体用于：根据第一变化斜率对应的直线与第二变化斜率对应的直线的交点的取值，确定该目标频率的校正后的阻抗。
需要说明的是，上述装置/单元之间的信息交互、执行过程等内容，由于与本申请方法实施例基于同一构思，其具体功能及带来的技术效果，具体可参见方法实施例部分，此处不再赘述。
图13是本申请一实施例提供的终端设备的结构示意图。如图13所示，该实施例的终端设备300包括：处理器310、存储器320，上述存储器320中存储有可在处理器310上运行的计算机程序321。处理器310执行计算机程序321时实现上述任意各个方法实施例中的步骤，例如图1所示的步骤101至104。或者，处理器310执行计算机程序321时实现上述各装置实施例中各模块的功能，例如图12所示模块201至204的功能。
示例性的，计算机程序321可以被分割成一个或多个模块/单元，一个或者多个模块/单元被存储在存储器320中，并由处理器310执行，以完成本申请。所述一个或多个模块/单元可以是能够完成特定功能的一系列计算机程序指令段，该指令段用于描述计算机程序321在终端设备300中的执行过程。
本领域技术人员可以理解，图13仅仅是终端设备的示例，并不构成对终端设备的限定，可以包括比图示更多或更少的部件，或者组合某些部件，或者不同的部件，例如输入输出设备、网络接入设备、总线等。
处理器310可以是中央处理单元(Central Processing Unit，CPU)，还可以是其他通用处理器、数字信号处理器 (Digital Signal Processor，DSP)、专用集成电路 (Application Specific Integrated Circuit，ASIC)、现成可编程门阵列 (Field-Programmable Gate Array，FPGA) 或者其他可编程逻辑器件、分立门或者晶体管逻辑器件、分立硬件组件等。通用处理器可以是微处理器或者该处理器也可以是任何常规的处理器等。
存储器320可以是终端设备的内部存储单元，例如终端设备的硬盘或内存，也可以是终端设备的外部存储设备，例如终端设备上配备的插接式硬盘，智能存储卡（Smart Media Card，SMC），安全数字（Secure Digital，SD）卡，闪存卡（Flash Card）等。上述存储器320还可以既包括终端设备的内部存储单元也包括外部存储设备。上述存储器320用于存储计算机程序以及终端设备所需的其他程序和数据。存储器320还可以用于暂时地存储已经输出或者将要输出的数据。
所属领域的技术人员可以清楚地了解到，为了描述的方便和简洁，仅以上述各功能单元、模块的划分进行举例说明，实际应用中，可以根据需要而将上述功能分配由不同的功能单元、模块完成，即将所述装置的内部结构划分成不同的功能单元或模块，以完成以上描述的全部或者部分功能。实施例中的各功能单元、模块可以集成在一个处理单元中，也可以是各个单元单独物理存在，也可以两个或两个以上单元集成在一个单元中，上述集成的单元既可以采用硬件的形式实现，也可以采用软件功能单元的形式实现。另外，各功能单元、模块的具体名称也只是为了便于相互区分，并不用于限制本申请的保护范围。上述系统中单元、模块的具体工作过程，可以参考前述方法实施例中的对应过程，在此不再赘述。
在上述实施例中，对各个实施例的描述都各有侧重，某个实施例中没有详述或记载的部分，可以参见其它实施例的相关描述。
本领域普通技术人员可以意识到，结合本文中所公开的实施例描述的各示例的单元及算法步骤，能够以电子硬件、或者计算机软件和电子硬件的结合来实现。这些功能究竟以硬件还是软件方式来执行，取决于技术方案的特定应用和设计约束条件。专业技术人员可以对每个特定的应用来使用不同方法来实现所描述的功能，但是这种实现不应认为超出本发明的范围。
在本发明所提供的实施例中，应该理解到，所揭露的装置/终端设备和方法，可以通过其它的方式实现。例如，以上所描述的装置/终端设备实施例仅仅是示意性的，例如，所述模块或单元的划分，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式，例如多个单元或组件可以结合或者可以集成到另一个系统，或一些特征可以忽略，或不执行。另一点，所显示或讨论的相互之间的耦合或直接耦合或通讯连接可以是通过一些接口，装置或单元的间接耦合或通讯连接，可以是电性，机械或其它的形式。
所述作为分离部件说明的单元可以是或者也可以不是物理上分开的，作为单元显示的部件可以是或者也可以不是物理单元，即可以位于一个地方，或者也可以分布到多个网络单元上。可以根据实际的需要选择其中的部分或者全部单元来实现本实施例方案的目的。
另外，在本发明各个实施例中的各功能单元可以集成在一个处理单元中，也可以是各个单元单独物理存在，也可以两个或两个以上单元集成在一个单元中。上述集成的单元既可以采用硬件的形式实现，也可以采用软件功能单元的形式实现。
所述集成的模块/单元如果以软件功能单元的形式实现并作为独立的产品销售或使用时，可以存储在一个计算机可读取存储介质中。基于这样的理解，本发明实现上述实施例方法中的全部或部分流程，也可以通过计算机程序来指令相关的硬件来完成，所述的计算机程序可存储于一计算机可读存储介质中，该计算机程序在被处理器执行时，可实现上述各个方法实施例的步骤。其中，所述计算机程序包括计算机程序代码，所述计算机程序代码可以为源代码形式、对象代码形式、可执行文件或某些中间形式等。所述计算机可读介质可以包括：能够携带所述计算机程序代码的任何实体或装置、记录介质、U盘、移动硬盘、磁碟、光盘、计算机存储器、只读存储器（ROM，Read-Only Memory）、随机存取存储器（RAM，Random Access Memory）、电载波信号、电信信号以及软件分发介质等。
以上所述实施例仅用以说明本发明的技术方案，而非对其限制；尽管参照前述实施例对本发明进行了详细的说明，本领域的普通技术人员应当理解：其依然可以对前述各实施例所记载的技术方案进行修改，或者对其中部分技术特征进行等同替换；而这些修改或者替换，并不使相应技术方案的本质脱离本发明各实施例技术方案的精神和范围，均应包含在本发明的保护范围之内。

Claims (10)

  1.  一种逆变器阻抗测量方法，其特征在于，包括：
    获取为逆变器注入第一扰动频率的扰动电压时的第一扰动电压频域信号和第一响应电流频域信号；获取为所述逆变器注入第二扰动频率的扰动电压时的第二扰动电压频域信号和第二响应电流频域信号；根据所述第一扰动电压频域信号和第一响应电流频域信号确定第一扰动电压信号和第一响应电流信号；根据所述第二扰动电压频域信号和第二响应电流频域信号确定第二扰动电压信号和第二响应电流信号；第一扰动频率和第二扰动频率为预设频率两侧的频率；
    根据所述第一扰动电压信号和第一响应电流信号确定第一扰动频率的第一阻抗，根据所述第二扰动电压信号和第二响应电流信号确定第二扰动频率的第二阻抗；根据所述第一阻抗和所述第二阻抗确定所述预设频率的阻抗。
  2.  根据权利要求1所述的逆变器阻抗测量方法，其特征在于，所述获取为逆变器注入第一扰动频率的扰动电压时的第一扰动电压频域信号和第一响应电流频域信号；获取为所述逆变器注入第二扰动频率的扰动电压时的第二扰动电压频域信号和第二响应电流频域信号，包括：
    获取为逆变器注入第一扰动频率的扰动电压时的第一扰动电压时域信号和第一响应电流时域信号；获取为所述逆变器注入第二扰动频率的扰动电压时的第二扰动电压时域信号和第二响应电流时域信号；
    分别对所述第一扰动电压时域信号和第一响应电流时域信号进行离散傅里叶变换，得到第一扰动电压频域信号和第一响应电流频域信号；分别对所述第二扰动电压时域信号和第二响应电流时域信号进行离散傅里叶变换，得到第二扰动电压频域信号和第二响应电流频域信号。
  3.  根据权利要求2所述的逆变器阻抗测量方法，其特征在于，所述扰动电压为三相扰动电压；
    所述获取为逆变器注入第一扰动频率的扰动电压时的第一扰动电压时域信号和第一响应电流时域信号；获取为所述逆变器注入第二扰动频率的扰动电压时的第二扰动电压时域信号和第二响应电流时域信号，包括：
    根据预设采样频率，获取为逆变器注入第一扰动频率的扰动电压时的第一三相扰动电压时域信号和第一三相响应电流时域信号；
    根据预设采样频率，获取为所述逆变器注入第二扰动频率的扰动电压时的第二三相扰动电压时域信号和第二三相响应电流时域信号；
    分别对所述第一三相扰动电压时域信号和所述第一三相响应电流时域信号进行abc/ 坐标变换，得到坐标变换后的第一扰动电压时域信号和坐标变换后的第一响应电流时域信号；
    分别对所述第二三相扰动电压时域信号和所述第二三相响应电流时域信号进行abc/ 坐标变换，得到坐标变换后的第二扰动电压时域信号和坐标变换后的第二响应电流时域信号；
    相应的，所述分别对所述第一扰动电压时域信号和第一响应电流时域信号进行离散傅里叶变换，得到第一扰动电压频域信号和第一响应电流频域信号；分别对所述第二扰动电压时域信号和第二响应电流时域信号进行离散傅里叶变换，得到第二扰动电压频域信号和第二响应电流频域信号，包括：
    分别对所述坐标变换后的第一扰动电压时域信号和坐标变换后的第一响应电流时域信号进行离散傅里叶变换，得到第一扰动电压频域信号和第一响应电流频域信号；
    分别对所述坐标变换后的第二扰动电压时域信号和坐标变换后的第二响应电流时域信号进行离散傅里叶变换，得到第二扰动电压频域信号和第二响应电流频域信号。
  4.  根据权利要求1所述的逆变器阻抗测量方法，其特征在于，所述根据所述第一扰动电压频域信号和第一响应电流频域信号确定第一扰动电压信号和第一响应电流信号；根据所述第二扰动电压频域信号和第二响应电流频域信号确定第二扰动电压信号和第二响应电流信号，包括：
    分别对所述第一扰动电压频域信号和第一响应电流频域信号进行信号提取，确定第一扰动频率的第一扰动电压信号和第一响应电流信号；
    分别对所述第二扰动电压频域信号和第二响应电流频域信号进行信号提取，确定第二扰动频率的第二扰动电压信号和第二响应电流信号。
  5.  根据权利要求1所述的逆变器阻抗测量方法，其特征在于，所述根据所述第一阻抗和所述第二阻抗确定所述预设频率的阻抗，包括：
    对所述第一阻抗和所述第二阻抗进行均值计算，确定所述预设频率的阻抗。
  6.  根据权利要求1-5任一项所述的逆变器阻抗测量方法，其特征在于，所述方法还包括：
    将预设扫频区间的多个等间距的目标频率依次作为所述预设频率，执行上述对所述预设频率的阻抗的确定步骤，得到所述预设扫频区间内的各个等间距的目标频率的阻抗；
    针对所述预设扫频区间内的每个等间距的目标频率，确定该目标频率在所述预设扫频区间内的相邻的第一频率和第二频率；根据所述第一频率的扰动频率的阻抗和该目标频率的扰动频率的阻抗确定第一变化斜率；根据所述第二频率的扰动频率的阻抗和该目标频率的扰动频率的阻抗确定第二变化斜率；判断所述第一变化斜率和第二变化斜率之差的绝对值是否大于预设阈值，若是，则对该目标频率的阻抗进行校正。
  7.  根据权利要求6所述的逆变器阻抗测量方法，其特征在于，在所述第一变化斜率和所述第二变化斜率之差的绝对值大于预设阈值时，对该目标频率的阻抗进行校正，包括：
    根据所述第一变化斜率对应的直线与所述第二变化斜率对应的直线的交点的取值，确定该目标频率的校正后的阻抗。
  8.  一种逆变器阻抗测量装置，其特征在于，包括：
    获取模块，用于获取为逆变器注入第一扰动频率的扰动电压时的第一扰动电压频域信号和第一响应电流频域信号；获取为所述逆变器注入第二扰动频率的扰动电压时的第二扰动电压频域信号和第二响应电流频域信号；
    第一确定模块，用于根据所述第一扰动电压频域信号和第一响应电流频域信号确定第一扰动电压信号和第一响应电流信号；根据所述第二扰动电压频域信号和第二响应电流频域信号确定第二扰动电压信号和第二响应电流信号；第一扰动频率和第二扰动频率为预设频率两侧的频率；
    第二确定模块，用于根据所述第一扰动电压信号和第一响应电流信号确定第一扰动频率的第一阻抗，根据所述第二扰动电压信号和第二响应电流信号确定第二扰动频率的第二阻抗；
    第三确定模块，用于根据所述第一阻抗和所述第二阻抗确定所述预设频率的阻抗。
  9.  一种终端设备，包括存储器和处理器，所述存储器中存储有可在所述处理器上运行的计算机程序，其特征在于，所述处理器执行所述计算机程序时实现如权利要求1至7任一项所述的逆变器阻抗测量方法。
  10. 一种计算机可读存储介质，所述计算机可读存储介质存储有计算机程序，其特征在于，所述计算机程序被处理器执行时实现如权利要求1至7任一项所述的逆变器阻抗测量方法。
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