CN107656139B - Signal determination method, device, equipment and computer readable storage medium - Google Patents

Signal determination method, device, equipment and computer readable storage medium Download PDF

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Publication number
CN107656139B
CN107656139B CN201710852168.9A CN201710852168A CN107656139B CN 107656139 B CN107656139 B CN 107656139B CN 201710852168 A CN201710852168 A CN 201710852168A CN 107656139 B CN107656139 B CN 107656139B
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signal
parameter
target
processed
signals
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CN107656139A (en
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白杨
任祖怡
夏尚学
徐柯
王良
高楠
王鹏翔
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NR Electric Co Ltd
NR Engineering Co Ltd
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NR Electric Co Ltd
NR Engineering Co Ltd
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R23/00Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
    • G01R23/16Spectrum analysis; Fourier analysis
    • G01R23/165Spectrum analysis; Fourier analysis using filters

Abstract

The embodiment of the invention discloses a signal determination method, which comprises the following steps: acquiring a signal to be processed; preprocessing the signal to be processed to obtain a first signal; filtering the signal to be processed and the first signal to obtain a second signal; performing spectrum analysis on the second signal to obtain a first parameter and a second parameter of a target signal in the second signal; and calculating the target parameters of the target signals based on the first parameters and the second parameters of the target signals. The embodiment of the invention also discloses a signal determination device, equipment and a computer readable storage medium.

Description

Signal determination method, device, equipment and computer readable storage medium
Technical Field
The present invention relates to the field of power system technologies, and in particular, to a signal determination method, apparatus, device, and computer-readable storage medium.
Background
With the rapid increase of economy, high-energy-consumption industries are rapidly developed, and renewable new energy sources are popularized and applied. In recent years, with the increasing maturity of new energy power generation technologies such as wind power generation and photovoltaic power generation technologies, the power generation cost of new energy is gradually reduced, and in the process of power transmission, an extra-high voltage large-capacity power transmission power grid or an extra/extra-high voltage alternating-current power transmission power grid with a series compensation capacitor is generally adopted for power transmission.
However, in an extra-high voltage large-capacity power transmission grid or an extra/extra-high voltage ac power transmission grid with a series compensation capacitor, the mutual influence among a wind power Generator inverter, a photovoltaic Generator inverter, a Static Var Compensator (SVC), a Static Var Generator (SVG), a series compensation capacitor and dc power transmission may cause a sub-synchronous Oscillation (SSO) phenomenon. The occurrence of the SSO phenomenon seriously affects the safe and stable operation of the power transmission grid and the safety of the generator set. The SSO phenomenon is mainly caused by inter-harmonic components in the voltage, current or power of the power grid, but in the existing inter-harmonic analysis technology, the inter-harmonic in the power grid cannot be accurately obtained.
Disclosure of Invention
In view of this, embodiments of the present invention are expected to provide a signal determining method, apparatus, device, and computer readable storage medium, so as to solve the problem in the prior art that inter-harmonics cannot be accurately obtained, achieve accurate acquisition of inter-harmonics in a power grid, and ensure accuracy of the acquired inter-harmonics.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a method of signal determination, the method comprising:
acquiring a signal to be processed;
preprocessing the signal to be processed to obtain a first signal;
filtering the signal to be processed and the first signal to obtain a second signal;
performing spectrum analysis on the second signal to obtain a first parameter and a second parameter of a target signal in the second signal;
and calculating the target parameters of the target signals based on the first parameters and the second parameters of the target signals.
Optionally, the preprocessing the signal to be processed to obtain a first signal includes:
acquiring preset parameters of a third signal in the signals to be processed;
multiplying the preset parameter by k to obtain a third parameter; wherein k is a positive integer, and the preset parameter is the period of the third signal;
and carrying out advanced or delayed processing on the signal to be processed according to the third parameter to obtain the first signal.
Optionally, the filtering the signal to be processed and the first signal to obtain a second signal includes:
and filtering the signal to be processed and the first signal by adopting a preset filtering algorithm to obtain the second signal.
Optionally, the performing spectrum analysis on the second processed signal to obtain a first parameter and a second parameter of a target signal in the second signal includes:
performing spectrum analysis on the second signal to obtain a fourth signal and a fourth parameter and a fifth parameter of the fourth signal; the second signal is obtained by superposing fourth signals, the fourth signals comprise at least one signal, the fourth parameter is the amplitude of the fourth signals, and the fifth parameter is the frequency of the fourth signals;
determining M fourth parameters meeting preset conditions, and acquiring signals corresponding to the M fourth parameters from the fourth signals to obtain the target signals; wherein M is a positive integer;
acquiring the first parameter and the second parameter of the target signal; the first parameter is the current amplitude of the target signal, and the second parameter is the frequency of the target signal.
Optionally, the calculating the target parameter of the target signal based on the first parameter and the second parameter of the target signal includes:
calculating a compensation coefficient of the target signal based on the third parameter and the second parameter;
dividing the first parameter by the compensation coefficient to obtain the target parameter; wherein the target parameter is the amplitude of the target signal before filtering processing.
Optionally, the calculating a compensation coefficient of the target signal based on the third parameter and the second parameter includes:
obtaining a product of the third parameter, the second parameter and the circumference ratio to obtain a sixth parameter of the target signal;
and calculating the sixth parameter by adopting a preset algorithm to obtain the compensation coefficient.
A signal determination apparatus, the apparatus comprising: the device comprises an acquisition unit, a preprocessing unit, a filtering unit, a spectrum analysis unit and a calculation unit; wherein:
the acquisition unit is used for acquiring a signal to be processed;
the preprocessing unit is used for preprocessing the signal to be processed to obtain a first signal;
the filtering unit is used for filtering the signal to be processed and the first signal to obtain a second signal;
the spectrum analysis unit is used for performing spectrum analysis on the second signal to obtain a first parameter and a second parameter of a target signal in the second signal;
the calculating unit is used for calculating the target parameters of the target signals based on the first parameters and the second parameters of the target signals.
Optionally, the preprocessing unit includes: the device comprises a first acquisition module, a multiplication module and a first processing module; wherein:
the first obtaining module is used for obtaining preset parameters of a third signal in the signals to be processed;
the multiplying module is used for multiplying the preset parameter by k to obtain a third parameter; wherein k is a positive integer, and the preset parameter is the period of the third signal;
and the first processing module is configured to perform advance or delay processing on the signal to be processed according to the third parameter to obtain the first signal.
Optionally, the filtering unit is specifically configured to:
and filtering the signal to be processed and the first signal by adopting a preset filtering algorithm to obtain the second signal.
Optionally, the spectrum analysis unit includes: the system comprises a spectrum analysis module, a second processing module and a second acquisition module; wherein:
the spectrum analysis module is used for performing spectrum analysis on the second signal to obtain a fourth signal and a fourth parameter and a fifth parameter of the fourth signal; the second signal is obtained by superposing fourth signals, the fourth signals comprise at least one signal, the fourth parameter is the amplitude of the fourth signals, and the fifth parameter is the frequency of the fourth signals;
the second processing module is configured to determine M fourth parameters meeting a preset condition, and acquire signals corresponding to the M fourth parameters from the fourth signals to obtain the target signal; wherein M is a positive integer;
the second obtaining module is configured to obtain the first parameter and the second parameter of the target signal; the first parameter is the current amplitude of the target signal, and the second parameter is the frequency of the target signal.
Optionally, the computing unit includes: a first calculation module and a second calculation module; wherein:
the first calculation module is configured to calculate a compensation coefficient of the target signal based on the third parameter and the second parameter;
the second calculation module is configured to divide the compensation coefficient by the first parameter to obtain the target parameter; wherein the target parameter is the amplitude of the target signal before filtering processing.
Optionally, the first calculating module is specifically configured to:
obtaining a product of the third parameter, the second parameter and the circumference ratio to obtain a sixth parameter of the target signal;
and calculating the sixth parameter by adopting a preset algorithm to obtain the compensation coefficient.
A signal determination device, the device comprising: a processor, a memory, and a communication bus; wherein:
the communication bus is used for realizing connection communication between the processor and the memory;
the processor is configured to execute a signal determination program stored in the memory to implement the steps of:
acquiring a signal to be processed;
preprocessing the signal to be processed to obtain a first signal;
filtering the signal to be processed and the first signal to obtain a second signal;
performing spectrum analysis on the second signal to obtain a first parameter and a second parameter of a target signal in the second signal;
and calculating the target parameters of the target signals based on the first parameters and the second parameters of the target signals.
A computer-readable storage medium having stored thereon a signal determination program which, when executed by a processor, implements the steps of the signal determination method as defined in any one of the preceding claims.
According to the signal determination method, the signal determination device, the signal determination equipment and the computer readable storage medium provided by the embodiment of the invention, after the signal to be processed is obtained, the signal to be processed is preprocessed to obtain the first signal, the signal to be processed and the first signal are filtered to obtain the second signal, then the second signal is subjected to spectrum analysis to obtain the first parameter and the second parameter of the target signal in the second signal, and finally the target parameter of the target signal is calculated and obtained based on the first parameter and the second parameter of the target signal. Therefore, the signal to be processed and the first signal obtained by preprocessing the signal to be processed are filtered, the same signal in the signal to be processed and the first signal can be filtered to obtain the second signal, the second signal is subjected to spectrum analysis to obtain the first parameter and the second parameter of each target signal, the target parameter of each target signal is obtained by calculating the first parameter and the second parameter of each target signal, the first parameter of the target signal which changes due to filtering processing can be corrected, the problem that inter-harmonics cannot be accurately obtained in the prior art is solved, accurate acquisition of inter-harmonics in a power grid is achieved, and the accuracy of the acquired inter-harmonics is guaranteed.
Drawings
Fig. 1 is a schematic flow chart of a signal determination method according to an embodiment of the present invention;
fig. 2 is a schematic flow chart of another signal determination method according to an embodiment of the present invention;
fig. 3 is a schematic flow chart of an application scenario provided in the embodiment of the present invention;
fig. 4 is a schematic structural diagram of a signal determining apparatus according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a signal determination device according to an embodiment of the present invention.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
An embodiment of the present invention provides a signal determination method, which is shown in fig. 1 and includes the following steps:
step 101, obtaining a signal to be processed.
Specifically, the step 101 of "acquiring a signal to be processed" may be implemented by a signal determination device. The signal to be processed may be a characteristic signal for characterizing an electrical signal transmitted in the power grid, and the characteristic signal may be represented in the form of a waveform or the like, for example, a current signal, a voltage signal, a power signal or the like of the electrical signal in the power grid. The signal determination device may be a signal determination apparatus, may be a device capable of acquiring a waveform signal of an electrical signal, and may be, for example, an oscilloscope, a spectrum analyzer, or the like.
Step 102, preprocessing a signal to be processed to obtain a first signal.
Specifically, the step 102 "pre-process the signal to be processed to obtain the first signal" may be implemented by the signal determination device. The preprocessing may be a preset processing manner, for example, a time characteristic parameter may be determined, and the signal to be processed is advanced or delayed based on the time characteristic parameter, so that the first signal related to the signal to be processed may be obtained.
And 103, filtering the signal to be processed and the first signal to obtain a second signal.
Specifically, the step 103 "performing filtering processing on the signal to be processed and the first signal to obtain the second signal" may be implemented by the signal determination device. Because the first signal is related to the signal to be processed, the signal to be processed and the first signal are filtered, so that some constant signals in the signal to be processed, such as electric signals transmitted in the power transmission process, can be filtered, and unnecessary electric signals, namely second signals, which are generated by interaction between components of power transmission equipment in a power grid and have adverse effects on the power grid, can be obtained.
And 104, performing spectrum analysis on the second signal to obtain a first parameter and a second parameter of the target signal in the second signal.
Specifically, the step 104 "performing spectrum analysis on the second signal to obtain the first parameter and the second parameter of the target signal in the second signal" may be implemented by the signal determination device. The frequency spectrum analysis is mainly a method for transforming a time domain signal into a frequency domain signal, and a Fourier transform method is mainly adopted to realize a transformation process, so that the quantitative analysis of the signal can be realized.
And 105, calculating a target parameter of the target signal based on the first parameter and the second parameter of the target signal.
Specifically, step 105 "calculating the target parameter of the target signal based on the first parameter and the second parameter of the target signal" may be implemented by the signal determination device. Since the first parameter and the second parameter of the target signal have a certain relationship, the first parameter and the second parameter of the target signal can be calculated according to the relationship to obtain the target parameter of the target signal. The target parameter of the target signal corresponds to the first parameter of the target signal, and the first parameter of the target signal is changed after the filtering processing, so that the first parameter of the target signal can be corrected according to the first parameter and the second parameter of the target signal and the relation between the first parameter and the second parameter, and the target parameter of the target signal is obtained.
In the signal determining method provided by the embodiment of the present invention, after the signal determining device obtains the signal to be processed, the signal to be processed is preprocessed to obtain the first signal, the signal to be processed and the first signal are filtered to obtain the second signal, then the second signal is subjected to spectrum analysis to obtain the first parameter and the second parameter of the target signal in the second signal, and finally the target parameter of the target signal is calculated based on the first parameter and the second parameter of the target signal. Therefore, the signal to be processed and the first signal obtained by preprocessing the signal to be processed are filtered, the same signal in the signal to be processed and the first signal can be filtered to obtain the second signal, the second signal is subjected to spectrum analysis to obtain the first parameter and the second parameter of each target signal, the target parameter of each target signal is obtained by calculating the first parameter and the second parameter of each target signal, the first parameter of the target signal which changes due to filtering processing can be corrected, the problem that inter-harmonics cannot be accurately obtained in the prior art is solved, accurate acquisition of inter-harmonics in a power grid is achieved, and the accuracy of the acquired inter-harmonics is guaranteed.
Based on the foregoing embodiments, an embodiment of the present invention provides a signal determination method, which is shown in fig. 2 and includes the following steps:
step 201, the signal determination device obtains a signal to be processed.
Specifically, taking the example that the signal to be processed is a waveform signal of a current signal of a power grid as an example, the signal determining device may be accessed to the power grid to obtain the current signal of the power grid, so as to obtain the waveform signal of the current signal of the power grid.
Step 202, the signal determination device obtains a preset parameter of a third signal in the signals to be processed.
Specifically, due to the mutual influence among multiple factors such as a wind driven generator inverter, a photovoltaic generator inverter, SVC, SVG, a series compensation capacitor, direct current transmission and the like, signals to be processed in the power grid contain higher harmonics and inter-harmonics besides power frequency sine waves (fundamental waves) which are expected to be transmitted; the harmonics are sine waves having frequencies that are positive integer multiples of the fundamental frequency, and the inter-harmonics are sine waves having frequencies that are non-integer multiples of the fundamental frequency. Since both the higher harmonics and the inter-harmonics affect the normal operation of the power grid and are related to the fundamental wave, the third signal may be the fundamental wave, and the preset parameter of the third signal may be a period parameter of the fundamental wave. For example, when the frequency of the fundamental current component of the electric signal transmitted in the power grid is 50 hertz (Hz), the period parameter, which is the preset parameter of the corresponding fundamental current component, is 0.02 seconds(s).
Step 203, the signal determination device multiplies the preset parameter by k to obtain a third parameter.
Wherein k is a positive integer, and the preset parameter is the period of the third signal.
Specifically, the third parameter T 'may be calculated by using the formula T' ═ k × T, where T is a preset parameter. k may be an empirical value obtained during actual use, an empirical value obtained by performing a large number of experiments, or an empirical value obtained by performing correction during actual use based on an empirical value obtained in the case of a large number of experiments. For example, in general, k may take the value 1; however, when the inter-harmonics include an inter-harmonic component close to the fundamental frequency of 50Hz, k may be set to a large value, for example, 3, because the magnitude of the inter-harmonic component may be small due to the filtering process.
And step 204, the signal determination device performs advanced or delayed processing on the signal to be processed according to the third parameter to obtain the first signal.
Specifically, for example, the signal determining device may delay the waveform signal of the current signal of the power grid by k × T in transmission time, which may be represented by a symbol f (T) as a relationship between the waveform signal of the current signal of the power grid and time, and correspondingly, after delaying the waveform signal of the current signal of the power grid by k × T, the obtained first signal may be represented by f (T + k × T).
Step 205, the signal determination device performs filtering processing on the signal to be processed and the first signal by using a preset filtering algorithm to obtain a second signal.
Specifically, the preset filtering algorithm may be an algorithm that can be used for filtering, such as a differential filtering algorithm. The differential filtering process may be represented by the formula f '(T) ═ f (T + k) × T) -f (T), where f' (T) is used to represent the second signal. Therefore, the current fundamental component, the current higher harmonic component and the current direct-current component can be filtered, and the second signal which is the inter-harmonic component to be analyzed is obtained.
Step 206, the signal determination device performs spectrum analysis on the second signal to obtain a fourth signal and a fourth parameter and a fifth parameter of the fourth signal.
The second signal is obtained by superposing fourth signals, the fourth signals comprise at least one signal, the fourth parameter is the amplitude of the fourth signals, and the fifth parameter is the frequency of the fourth signals.
Specifically, the second signal is formed by superimposing a large number of fourth signals, i.e., inter-harmonics, so that the amplitude and frequency of each inter-harmonic and each inter-harmonic can be obtained by performing spectrum analysis based on the fourier transform principle on the second signal.
Step 207, the signal determining device determines M fourth parameters meeting the preset condition, and acquires signals corresponding to the M fourth parameters from the fourth signals to obtain the target signal.
Wherein M is a positive integer.
Specifically, the preset condition may be that the fourth parameter of the fourth signal satisfies a certain threshold, or the fourth parameter of each obtained fourth signal is sorted according to a magnitude relationship in the analysis, and when the fourth parameter of each obtained fourth signal is sorted according to a sorting rule from large to small, the preset condition is that the fourth parameters of the first M fourth signals are obtained, or when the fourth parameter of each obtained fourth signal is sorted according to a sorting rule from small to large, the preset condition is that the fourth parameters of the last M fourth signals are obtained.
Because the sub-synchronous oscillation phenomenon of the power grid can be caused only by the inter-harmonic wave with larger amplitude, the power grid can not run safely and stably, only the fourth signals corresponding to the M fourth parameters meeting the preset conditions are needed to be obtained and used as target signals for analysis, and otherwise, the workload of analyzing the inter-harmonic wave can be increased. M may be selected according to a specific application scenario, and generally, M may be a value within a range of 5 to 20, which may include 5 and 20.
But M may also be the total number of all fourth signals obtained, if necessary, during a particular analysis.
For example, the obtained amplitudes of each inter-harmonic may be sorted according to a sorting rule from large to small, the amplitudes of the first M inter-harmonics are selected, and then the inter-harmonics corresponding to the amplitudes of the M inter-harmonics are obtained from all the inter-harmonics to obtain the target signal.
Step 208, the signal determination device obtains a first parameter and a second parameter of the target signal.
The first parameter is the current amplitude of the target signal, and the second parameter is the frequency of the target signal.
Specifically, because M inter-harmonics are obtained, the corresponding target signal has M, the amplitude of each of the M inter-harmonics corresponds to the amplitude of the target signal, the frequency of each inter-harmonic corresponds to the frequency of the target signal, that is, the fourth parameter of each of the corresponding fourth signals is the first parameter of the target signal, and the fifth parameter of each of the fourth signals is the second parameter of the target signal.
And step 209, the signal determination device calculates a compensation coefficient of the target signal based on the third parameter and the second parameter.
Wherein the second parameter is the frequency of the target signal.
Specifically, the compensation coefficient is used to correct the first parameter of the target signal.
Wherein the step 209 performed by the signal determination device can be realized by:
step 1, the signal determination equipment obtains a product of the third parameter, the second parameter and the circumference ratio to obtain a sixth parameter of the target signal.
Specifically, the formula p ═ pi × f can be usednK x T, where p is used to represent a sixth parameter of the target signal, k x T represents a third parameter of the target signal, fnA second parameter representing the target signal, where pi represents the circumferential ratio, n represents the second target signal, and n is 0,1,2, … …, M-1.
And 2, calculating the sixth parameter by the signal determination equipment by adopting a preset algorithm to obtain a compensation coefficient.
Specifically, the preset algorithm may be a preset algorithm for calculating the compensation coefficient based on the sixth parameter. In the embodiment of the present invention, the preset algorithm may be that the sine value of the sixth parameter is multiplied by 2, which may be denoted as b-2 sinp, where b is used to represent the compensation coefficient and sin is used to represent the sine algorithm.
Step 210, the signal determination device divides the compensation coefficient by the first parameter to obtain a target parameter.
Wherein the target parameter is the amplitude of the target signal before the filtering process.
Specifically, the target parameter of the target signal can be represented by formula A'n=AnCalculated to obtain, wherein A'nA target parameter for representing the nth target signal, i.e. the amplitude, A, corresponding to the nth of the M inter-harmonics after the differential filtering processnThe first parameter used to represent the nth target signal is the corresponding amplitude of the nth of the M obtained inter-harmonics before the differential filtering process.
An application scenario provided by the implementation of the present invention may be as shown in fig. 3, and includes: a differential filtering module 31, a spectral analysis module 32 and an amplitude compensation module 33.
The differential filtering module 31 is configured to perform differential filtering on an original waveform, that is, an electrical signal obtained from a power grid, such as a current waveform, a voltage waveform, or a power waveform, and a waveform obtained by performing translation processing on the original waveform according to an integral multiple of a period of a signal to be filtered, to obtain a filtered waveform signal, where the period of the signal to be filtered is 0.02s, and the corresponding execution step is step 201 and step 205 in the foregoing embodiment. The differential filtering can filter out direct current components, fundamental wave components and higher harmonic components of integral multiples of fundamental wave frequency in the original waveform to obtain a filtered waveform signal formed by superposition of various inter-harmonics. When the original waveform corresponds to a current waveform, the direct current component is a direct current component; when the original waveform corresponds to a voltage waveform, the direct current component is a direct current voltage component; when the original waveform corresponds to a power waveform, the dc component is the average power.
The spectrum analysis module 32 is configured to perform spectrum analysis on the filtered waveform signal to calculate an amplitude a of each inter-harmonicnAnd frequency fnThe corresponding step is step 206-207 in the above embodiment. For example, after differential filtering processing is performed on a power waveform signal, i.e., an original signal, of a power grid line in a certain fault process, inter-harmonic component signals in the power waveform signal of the power grid line are obtained, spectrum analysis is performed on the inter-harmonic component signals in the power waveform signal of the power grid line, and 5 inter-harmonic components with the maximum power amplitude are selected, wherein the amplitude a of the corresponding 5 inter-harmonic componentsnAnd frequency fnComprises the following steps: a. the169 Megawatts (MW), f1=20Hz;A2=61MW,f2=35Hz;A3=52MW,f3=15Hz;A4=36MW,f4=30Hz; A5=21MW,f5=25Hz。
Finally, the amplitude compensation module performs compensation calculation on the amplitude of each inter-harmonic in the 5 inter-harmonics according to the frequency of the corresponding inter-harmonic, so as to obtain the original amplitudes of the 5 inter-harmonics before the filtering processing, respectively, and the corresponding execution step is step 208 and step 210 in the above embodiment. Correspondingly, the compensated original amplitude is:
it should be noted that, for the explanation of the same steps or concepts in the present embodiment as in the other embodiments, reference may be made to the description in the other embodiments, and details are not described here.
According to the signal determination method provided by the embodiment of the invention, the signal to be processed and the first signal obtained by preprocessing the signal to be processed are subjected to filtering processing, the signal which is the same as that in the first signal can be filtered to obtain the second signal, the second signal is subjected to spectrum analysis to obtain the first parameter and the second parameter of each target signal, the target parameter of each target signal is obtained by calculating the first parameter and the second parameter of each target signal, the first parameter of the target signal which changes due to the filtering processing can be corrected, the problem that inter-harmonics cannot be accurately obtained in the prior art is solved, the inter-harmonics in a power grid can be accurately obtained, and the accuracy of the obtained inter-harmonics is ensured; furthermore, a certain amount of inter-harmonics are selected for analysis, so that the workload of analysis is reduced, and the energy consumption is reduced.
Based on the foregoing embodiments, an embodiment of the present invention provides a signal determining apparatus 4, which can be applied to a signal determining method provided in the embodiments corresponding to fig. 1 to 2, and as shown in fig. 4, the apparatus includes: an obtaining unit 41, a preprocessing unit 42, a filtering unit 43, a spectrum analyzing unit 44 and a calculating unit 45, wherein:
an obtaining unit 41, configured to obtain a signal to be processed.
The preprocessing unit 42 is configured to preprocess the signal to be processed to obtain a first signal.
And a filtering unit 43, configured to perform filtering processing on the signal to be processed and the first signal to obtain a second signal.
And the spectrum analysis unit 44 is configured to perform spectrum analysis on the second signal to obtain a first parameter and a second parameter of the target signal in the second signal.
And a calculating unit 45, configured to calculate a target parameter of the target signal based on the first parameter and the second parameter of the target signal.
Specifically, the preprocessing unit 42 includes: the device comprises a first acquisition module, a multiplication module and a first processing module, wherein:
the first acquisition module is used for acquiring preset parameters of a third signal in the signals to be processed.
And the multiplying module is used for multiplying the preset parameter by k to obtain a third parameter.
Wherein k is a positive integer, and the preset parameter is the period of the third signal.
And the first processing module is used for carrying out advanced or delayed processing on the signal to be processed according to the third parameter to obtain a first signal.
Specifically, the filtering unit 43 is specifically configured to:
and filtering the signal to be processed and the first signal by adopting a preset filtering algorithm to obtain a second signal.
Specifically, the spectrum analysis unit 44 includes: the system comprises a spectrum analysis module, a second processing module and a second acquisition module, wherein:
and the spectrum analysis module is used for carrying out spectrum analysis on the second signal to obtain a fourth signal and a fourth parameter and a fifth parameter of the fourth signal.
The second signal is obtained by superposing fourth signals, the fourth signals comprise at least one signal, the fourth parameter is the amplitude of the fourth signals, and the fifth parameter is the frequency of the fourth signals.
And the second processing module is used for determining M fourth parameters meeting the preset conditions, and acquiring signals corresponding to the M fourth parameters from the fourth signals to obtain the target signals.
Wherein M is a positive integer.
And the second acquisition module is used for acquiring the first parameter and the second parameter of the target signal.
The first parameter is the current amplitude of the target signal, and the second parameter is the frequency of the target signal.
Specifically, the calculation unit 45 includes: a first computing module and a second computing module, wherein:
and the first calculation module is used for calculating a compensation coefficient of the target signal based on the third parameter and the second parameter.
And the second calculation module is used for dividing the first parameter by the compensation coefficient to obtain a target parameter.
Wherein the target parameter is the amplitude of the target signal before the filtering process.
Specifically, the first calculation module is specifically configured to:
and obtaining the product of the third parameter, the second parameter and the circumference ratio to obtain a sixth parameter of the target signal.
And calculating the sixth parameter by adopting a preset algorithm to obtain a compensation coefficient.
In the signal determining apparatus provided in the embodiment of the present invention, after the signal determining device obtains the signal to be processed, the signal to be processed is preprocessed to obtain the first signal, the signal to be processed and the first signal are filtered to obtain the second signal, then the second signal is subjected to spectrum analysis to obtain the first parameter and the second parameter of the target signal in the second signal, and finally the target parameter of the target signal is calculated based on the first parameter and the second parameter of the target signal. Therefore, the signal to be processed and the first signal obtained by preprocessing the signal to be processed are filtered, the same signal in the signal to be processed and the first signal can be filtered to obtain a second signal, the second signal is subjected to spectrum analysis to obtain a first parameter and a second parameter of each target signal, the target parameter of each target signal is obtained by calculating the first parameter and the second parameter of each target signal, the first parameter of the target signal which changes due to filtering processing can be corrected, the problem that inter-harmonics cannot be accurately obtained in the prior art is solved, accurate acquisition of inter-harmonics in a power grid is achieved, and the accuracy of the acquired inter-harmonics is guaranteed; furthermore, a certain amount of inter-harmonics are selected for analysis, so that the workload of analysis is reduced, and the energy consumption is reduced.
Based on the foregoing embodiments, an embodiment of the present invention provides a signal determining apparatus 5, which may be applied to a signal determining method provided in the embodiments corresponding to fig. 1-2, and as shown in fig. 5, the signal determining apparatus may include: a processor 51, a memory 52, and a communication bus 53, wherein:
the communication bus 53 is used to realize connection communication between the processor 51 and the memory 52.
The processor 51 is configured to execute a signal determination program stored in the memory 52 to implement the following steps:
and acquiring a signal to be processed.
And preprocessing the signal to be processed to obtain a first signal.
And filtering the signal to be processed and the first signal to obtain a second signal.
And carrying out spectrum analysis on the second signal to obtain a first parameter and a second parameter of the target signal in the second signal.
And calculating the target parameters of the target signals based on the first parameters and the second parameters of the target signals.
Specifically, in other embodiments of the present invention, the processor 51 is further configured to execute a signal determination program to implement the following steps:
and acquiring preset parameters of a third signal in the signals to be processed.
And multiplying the preset parameter by k to obtain a third parameter.
Wherein k is a positive integer, and the preset parameter is the period of the third signal.
And carrying out advanced or delayed processing on the signal to be processed according to the third parameter to obtain a first signal.
Specifically, in other embodiments of the present invention, the processor 51 is further configured to execute a signal determination program to implement the following steps:
and filtering the signal to be processed and the first signal by adopting a preset filtering algorithm to obtain a second signal.
Specifically, in other embodiments of the present invention, the processor 51 is further configured to execute a signal determination program to implement the following steps:
and carrying out spectrum analysis on the second signal to obtain a fourth signal and a fourth parameter and a fifth parameter of the fourth signal.
The second signal is obtained by superposing fourth signals, the fourth signals comprise at least one signal, the fourth parameter is the amplitude of the fourth signals, and the fifth parameter is the frequency of the fourth signals.
And determining M fourth parameters meeting the preset conditions, and acquiring signals corresponding to the M fourth parameters from the fourth signals to obtain the target signals.
Wherein M is a positive integer.
And acquiring a first parameter and a second parameter of the target signal.
The first parameter is the current amplitude of the target signal, and the second parameter is the frequency of the target signal.
Specifically, in other embodiments of the present invention, the processor 51 is further configured to execute a signal determination program to implement the following steps:
and calculating a compensation coefficient of the target signal based on the third parameter and the second parameter.
Wherein the second parameter is the frequency of the target signal.
And dividing the compensation coefficient by the first parameter to obtain a target parameter.
Wherein the target parameter is the amplitude of the target signal before the filtering process.
Specifically, in other embodiments of the present invention, the processor 51 is further configured to execute a signal determination program to implement the following steps:
and obtaining the product of the third parameter, the second parameter and the circumference ratio to obtain a sixth parameter of the target signal.
And calculating the sixth parameter by adopting a preset algorithm to obtain a compensation coefficient.
It should be noted that, in the interaction process between steps implemented by the processor in this embodiment, reference may be made to the interaction process in the signal determination method provided in the embodiments corresponding to fig. 1 to 2, and details are not described here.
In the signal determining apparatus provided in the embodiment of the present invention, after the signal determining apparatus obtains the signal to be processed, a preset parameter of a third signal in the signal to be processed is obtained, the preset parameter is multiplied by k to obtain a third parameter, then the signal to be processed is processed in advance or delayed according to the third parameter to obtain a first signal, the signal to be processed and the first signal are filtered by using a preset filtering algorithm to obtain a second signal, the second signal is subjected to spectrum analysis to obtain a fourth signal and a fifth parameter of the fourth signal, M fourth parameters meeting a preset condition are determined, signals corresponding to the M fourth parameters are obtained from the fourth signal to obtain a target signal, the fourth parameter of the fourth signal corresponding to the target signal is obtained to obtain the first parameter, the fifth parameter of the fourth signal corresponding to the target signal is obtained to obtain the second parameter, and then calculating a compensation coefficient of the target signal based on the third parameter and the second parameter, and dividing the compensation coefficient by the first parameter to obtain a target parameter. Therefore, the signal to be processed and the first signal obtained by preprocessing the signal to be processed are filtered, the same signal in the signal to be processed and the first signal can be filtered to obtain the second signal, the second signal is subjected to spectrum analysis to obtain the first parameter and the second parameter of each target signal, the target parameter of each target signal is obtained by calculating the first parameter and the second parameter of each target signal, the first parameter of the target signal which changes due to filtering processing can be corrected, the problem that inter-harmonics cannot be accurately obtained in the prior art is solved, accurate acquisition of inter-harmonics in a power grid is achieved, and the accuracy of the acquired inter-harmonics is guaranteed.
Based on the foregoing embodiments, embodiments of the present invention provide a computer-readable storage medium storing one or more signal determination programs, the one or more signal determination programs being executable by one or more processors to implement the steps of:
and acquiring a signal to be processed.
And preprocessing the signal to be processed to obtain a first signal.
And filtering the signal to be processed and the first signal to obtain a second signal.
And carrying out spectrum analysis on the second signal to obtain a first parameter and a second parameter of the target signal in the second signal.
And calculating the target parameters of the target signals based on the first parameters and the second parameters of the target signals.
Specifically, in other embodiments of the present invention, the filtering processing is performed on the signal to be processed to obtain the first signal, and the method includes the following steps:
and acquiring preset parameters of a third signal in the signals to be processed.
And multiplying the preset parameter by k to obtain a third parameter.
Wherein k is a positive integer, and the preset parameter is the period of the third signal.
And carrying out advanced or delayed processing on the signal to be processed according to the third parameter to obtain a first signal.
Specifically, in other embodiments of the present invention, obtaining the second processed signal based on the signal to be processed and the first processed signal includes the following steps:
and filtering the signal to be processed and the first signal by adopting a preset filtering algorithm to obtain a second signal.
Specifically, in another embodiment of the present invention, performing spectrum analysis on the second processed signal to obtain a first parameter and a second parameter of the target signal in the second signal, includes the following steps:
and carrying out spectrum analysis on the second signal to obtain a fourth signal and a fourth parameter and a fifth parameter of the fourth signal.
The second signal is obtained by superposing fourth signals, the fourth signals comprise at least one signal, the fourth parameter is the amplitude of the fourth signals, and the fifth parameter is the frequency of the fourth signals.
And determining M fourth parameters meeting the preset conditions, and acquiring signals corresponding to the M fourth parameters from the fourth signals to obtain the target signals.
Wherein M is a positive integer.
A first parameter and a second parameter of a target signal are acquired.
The first parameter is the current amplitude of the target signal, and the second parameter is the frequency of the target signal.
Specifically, in another embodiment of the present invention, calculating the target parameter of the target signal based on the first parameter and the second parameter of the target signal includes the following steps:
and calculating a compensation coefficient of the target signal based on the third parameter and the second parameter.
Wherein the second parameter is the frequency of the target signal.
And dividing the compensation coefficient by the first parameter to obtain a target parameter.
Wherein the target parameter is the amplitude of the target signal before the filtering process.
Specifically, in another embodiment of the present invention, the calculating the compensation coefficient of the target signal based on the third parameter and the second parameter includes the following steps:
and obtaining the product of the third parameter, the second parameter and the circumference ratio to obtain a sixth parameter of the target signal.
And calculating the sixth parameter by adopting a preset algorithm to obtain a compensation coefficient.
It should be noted that, in the interaction process between steps implemented by the processor in this embodiment, reference may be made to the interaction process in the signal determination method provided in the embodiments corresponding to fig. 1 to 2, and details are not described here.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which is stored in a storage medium (such as ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a terminal (such as a mobile phone, a computer, a server, an air conditioner, or a network device) to execute the methods described in the embodiments of the present invention.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims (14)

1. A method of signal determination, the method comprising:
acquiring a signal to be processed;
preprocessing the signal to be processed to obtain a first signal; wherein the first signal is a delayed signal of the signal to be processed;
filtering the signal to be processed and the first signal to obtain a second signal; wherein the second signal is an inter-harmonic component in the signal to be processed;
performing spectrum analysis on the second signal to obtain a first parameter and a second parameter of a target signal in the second signal; wherein the target signal is an inter-harmonic signal satisfying a preset condition in the second signal; the first parameter is an amplitude of the target signal; the second parameter is a frequency of the target signal;
calculating a target parameter of the target signal based on the first parameter and the second parameter of the target signal; wherein the target parameter is used to correct the first parameter.
2. The method of claim 1, wherein the pre-processing the signal to be processed to obtain a first signal comprises:
acquiring preset parameters of a third signal in the signals to be processed; wherein the third signal is a fundamental signal;
multiplying the preset parameter by k to obtain a third parameter; wherein k is a positive integer, and the preset parameter is the period of the third signal;
and carrying out advanced or delayed processing on the signal to be processed according to the third parameter to obtain the first signal.
3. The method of claim 1, wherein the filtering the signal to be processed and the first signal to obtain a second signal comprises:
and filtering the signal to be processed and the first signal by adopting a preset filtering algorithm to obtain the second signal.
4. The method of claim 1, wherein performing spectral analysis on the second signal to obtain a first parameter and a second parameter of a target signal in the second signal comprises:
performing spectrum analysis on the second signal to obtain a fourth signal and a fourth parameter and a fifth parameter of the fourth signal; the second signal is obtained by superposing fourth signals, the fourth signals comprise at least one inter-harmonic signal, the fourth parameter is the amplitude of the fourth signals, and the fifth parameter is the frequency of the fourth signals;
determining M fourth parameters meeting preset conditions, and acquiring signals corresponding to the M fourth parameters from the fourth signals to obtain the target signals; wherein M is a positive integer;
and acquiring the first parameter and the second parameter of the target signal.
5. The method of claim 2, wherein calculating the target parameter of the target signal based on the first parameter and the second parameter of the target signal comprises:
calculating a compensation coefficient of the target signal based on the third parameter and the second parameter; wherein the compensation coefficient is used for correcting the first parameter;
and dividing the first parameter by the compensation coefficient to obtain the target parameter.
6. The method of claim 5, wherein calculating the compensation factor for the target signal based on the third parameter and the second parameter comprises:
obtaining a product of the third parameter, the second parameter and the circumference ratio to obtain a sixth parameter of the target signal;
and calculating the sixth parameter by adopting a preset algorithm to obtain the compensation coefficient.
7. A signal determination device, the device comprising: the device comprises an acquisition unit, a preprocessing unit, a filtering unit, a spectrum analysis unit and a calculation unit; wherein:
the acquisition unit is used for acquiring a signal to be processed;
the preprocessing unit is used for preprocessing the signal to be processed to obtain a first signal; wherein the first signal is a delayed signal of the signal to be processed;
the filtering unit is used for filtering the signal to be processed and the first signal to obtain a second signal; wherein the second signal is an inter-harmonic component in the signal to be processed;
the spectrum analysis unit is used for performing spectrum analysis on the second signal to obtain a first parameter and a second parameter of a target signal in the second signal; wherein the target signal is an inter-harmonic signal satisfying a preset condition in the second signal; the first parameter is an amplitude of the target signal; the second parameter is a frequency of the target signal;
the calculation unit is used for calculating a target parameter of the target signal based on a first parameter and a second parameter of the target signal; wherein the target parameter is used to correct the first parameter.
8. The apparatus of claim 7, wherein the pre-processing unit comprises: the device comprises a first acquisition module, a multiplication module and a first processing module; wherein:
the first obtaining module is used for obtaining preset parameters of a third signal in the signals to be processed; wherein the third signal is a fundamental signal;
the multiplying module is used for multiplying the preset parameter by k to obtain a third parameter; wherein k is a positive integer, and the preset parameter is the period of the third signal;
and the first processing module is configured to perform advance or delay processing on the signal to be processed according to the third parameter to obtain the first signal.
9. The apparatus according to claim 7, wherein the filtering unit is specifically configured to:
and filtering the signal to be processed and the first signal by adopting a preset filtering algorithm to obtain the second signal.
10. The apparatus of claim 7, wherein the spectrum analysis unit comprises: the system comprises a spectrum analysis module, a second processing module and a second acquisition module; wherein:
the spectrum analysis module is used for performing spectrum analysis on the second signal to obtain a fourth signal and a fourth parameter and a fifth parameter of the fourth signal; the second signal is obtained by superposing fourth signals, the fourth signals comprise at least one inter-harmonic signal, the fourth parameter is the amplitude of the fourth signals, and the fifth parameter is the frequency of the fourth signals;
the second processing module is configured to determine M fourth parameters meeting a preset condition, and acquire signals corresponding to the M fourth parameters from the fourth signals to obtain the target signal; wherein M is a positive integer;
the second obtaining module is configured to obtain the first parameter and the second parameter of the target signal.
11. The apparatus of claim 8, wherein the computing unit comprises: a first calculation module and a second calculation module; wherein:
the first calculation module is configured to calculate a compensation coefficient of the target signal based on the third parameter and the second parameter; wherein the compensation coefficient is used for correcting the first parameter;
and the second calculation module is used for dividing the first parameter by the compensation coefficient to obtain the target parameter.
12. The apparatus of claim 11, wherein the first computing module is specifically configured to:
obtaining a product of the third parameter, the second parameter and the circumference ratio to obtain a sixth parameter of the target signal;
and calculating the sixth parameter by adopting a preset algorithm to obtain the compensation coefficient.
13. A signal determination device, characterized in that the device comprises: a processor, a memory, and a communication bus; wherein:
the communication bus is used for realizing connection communication between the processor and the memory;
the processor is configured to execute a signal determination program stored in the memory to implement the steps of:
acquiring a signal to be processed;
preprocessing the signal to be processed to obtain a first signal; wherein the first signal is a delayed signal of the signal to be processed;
filtering the signal to be processed and the first signal to obtain a second signal; wherein the second signal is an inter-harmonic component in the signal to be processed;
performing spectrum analysis on the second signal to obtain a first parameter and a second parameter of a target signal in the second signal; wherein the target signal is an inter-harmonic signal satisfying a preset condition in the second signal; the first parameter is an amplitude of the target signal; the second parameter is a frequency of the target signal;
calculating a target parameter of the target signal based on the first parameter and the second parameter of the target signal; wherein the target parameter is used to correct the first parameter.
14. A computer-readable storage medium, characterized in that the computer-readable storage medium has stored thereon a signal determination program which, when executed by a processor, implements the steps of the signal determination method according to any one of claims 1 to 6.
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