CN105548698B - Frequency power signal method for trimming and system - Google Patents

Frequency power signal method for trimming and system Download PDF

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CN105548698B
CN105548698B CN201510890720.4A CN201510890720A CN105548698B CN 105548698 B CN105548698 B CN 105548698B CN 201510890720 A CN201510890720 A CN 201510890720A CN 105548698 B CN105548698 B CN 105548698B
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frequency
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sin
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CN105548698A (en
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万文军
李军
王越超
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Electric Power Research Institute of Guangdong Power Grid Co Ltd
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Electric Power Research Institute of Guangdong Power Grid 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
    • G01R23/167Spectrum analysis; Fourier analysis using filters with digital filters

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Abstract

The present invention relates to a kind of frequency power signal method for trimming and system.Include fundamental wave component, subharmonic composition and subharmonic composition etc. in actual electric power signal, but with the amplitude maximum of fundamental wave component, so the non-integer for solving fundamental signal blocks, also just largely solve the problems, such as that non-integer blocks caused spectral leakage, improve the degree of accuracy of sine parameter calculating.The present invention changes the fundamental frequency of signal sequence by obtained several multiplication sequences, can realize in theory and the number of cycles of fundamental signal is blocked, so as to substantially increase the degree of accuracy of sine parameter calculating.

Description

Frequency power signal method for trimming and system
Technical field
The present invention relates to technical field of power systems, more particularly to a kind of frequency power signal method for trimming and system.
Background technology
Frequency measurement, phase measurement and amplitude measurement of power system etc. are the measurement of sine parameter in itself.It hurry up Fast Fourier Transform Algorithm (FFT) and discrete fourier transform algorithm (DFT) are the basic mathematical sides calculated for sine parameter Method.In these algorithms, it is to cause Algorithm Error that the non-integer of signal sampling process, which blocks caused spectrum leakage problem, Main immanent cause, spectrum leakage problem is objectively difficult to avoid that.
Also some improved methods, such as adding window mouth function algorithm, using interpolation correction algorithm scheduling algorithm, though these algorithms The influence of spectrum leakage problem can so be reduced, but test result indicates that these algorithms are not suitable for high accuracy sine parameter Calculate.
The content of the invention
Based on this, it is necessary in view of the above-mentioned problems, providing a kind of frequency power signal method for trimming and system, can ensure The high accuracy that sine parameter calculates.
In order to solve the above technical problems, the present invention adopts the following technical scheme that:
A kind of frequency power signal method for trimming, including step:
According to the lower limit of frequency power signal scope, preset sample frequency and default integer signal period number, obtain preliminary Sequence length;
Electric power signal is sampled according to the preliminary sequence length, obtains the preliminary sequence of the electric power signal;
Line frequency preliminary survey is entered to the preliminary sequence, obtains the preliminary frequency of the electric power signal, according to the just cadence Rate obtains reference frequency;
According to the preset sample frequency and the reference frequency, the unit period sequence for obtaining the electric power signal is grown Degree;
According to the default integer signal period number and the unit period sequence length, predetermined sequence length is obtained;
According to the predetermined sequence length and default starting point, the first positive sequence, root are obtained from the preliminary sequence The first anti-pleat sequence is obtained according to the described first positive sequence;
First positive phase is obtained according to the described first positive sequence, it is anti-phase to obtain first according to the described first anti-pleat sequence Position;
First average initial phase is obtained according to first positive phase and first antiphase;
According to the described first average initial phase and preset phase value, obtain phase fiducial value, according to the phase fiducial value, The default starting point and the unit period sequence length, obtain new starting point;
According to the predetermined sequence length and the new starting point, the second positive sequence is obtained from the preliminary sequence, Second anti-pleat sequence is obtained according to the second positive sequence;
Second positive phase is obtained according to the described second positive sequence, it is anti-phase to obtain second according to the described second anti-pleat sequence Position;
Second average initial phase is obtained according to second positive phase and second antiphase;
Described second positive sequence is added with the described second anti-pleat sequence, obtained and sequence, according to described and sequence and The cosine function value of described second average initial phase, obtains cosine function modulation sequence;
Described second positive sequence and the described second anti-pleat sequence are subtracted each other, obtain difference sequence, according to the difference sequence and The sine function of described second average initial phase, obtains SIN function modulation sequence;
Fine setting frequency is set, the discrete sine function of the fine setting frequency is multiplied with the cosine function modulation sequence and obtained The first multiplication sequence is obtained, the discrete cosine function of the fine setting frequency is multiplied with the SIN function modulation sequence and obtains second Multiplication sequence, the discrete sine function of the fine setting frequency is multiplied with the SIN function modulation sequence and obtains the 3rd multiplication sequence Row, the discrete cosine function of the fine setting frequency is multiplied with the cosine function modulation sequence and obtains the 4th multiplication sequence;
According to first multiplication sequence and the frequency of second multiplication sequence adjustment SIN function sequence, according to described The frequency of 3rd multiplication sequence and the 4th multiplication sequence adjustment cosine function sequence.
A kind of frequency power signal micro-tensioning system, including:
Preliminary sequence length determination modul, for the lower limit according to frequency power signal scope, preset sample frequency and pre- If integer signal period number, preliminary sequence length is obtained;
Preliminary sequence acquisition module, for being sampled according to the preliminary sequence length to electric power signal, described in acquisition The preliminary sequence of electric power signal;
Reference frequency determining module, for entering line frequency preliminary survey to the preliminary sequence, obtain the first of the electric power signal Synchronizing frequency, reference frequency is obtained according to the preliminary frequency;
Unit period sequence length determining module, for according to the preset sample frequency and the reference frequency, obtaining The unit period sequence length of the electric power signal;
Predetermined sequence length determination modul, for according to the default integer signal period number and the unit period sequence Length, obtain predetermined sequence length;
First ray acquisition module, for according to the predetermined sequence length and default starting point, from the preliminary sequence The first positive sequence of middle acquisition, the first anti-pleat sequence is obtained according to the described first positive sequence;
First positive and negative phase determination module, for obtaining the first positive phase according to the described first positive sequence, according to described First anti-pleat sequence obtains the first antiphase;
First average initial phase determining module, for obtaining first according to first positive phase and first antiphase Average initial phase;
New starting point determining module, for according to the described first average initial phase and preset phase value, obtaining phase bit comparison Value, according to the phase fiducial value, the default starting point and the unit period sequence length, obtains new starting point;
Second retrieval module, for according to the predetermined sequence length and the new starting point, from the preliminary sequence The second positive sequence is obtained in row, the second anti-pleat sequence is obtained according to the second positive sequence;
Second positive and negative phase determination module, for obtaining the second positive phase according to the described second positive sequence, according to described Second anti-pleat sequence obtains the second antiphase;
Second average initial phase determining module, for obtaining second according to second positive phase and second antiphase Average initial phase;
Cosine function modulation sequence determining module, for by the described second positive sequence and the described second anti-pleat sequence phase Add, obtain and sequence, the cosine function value for the initial phase that is averaged according to described and sequence and described second, acquisition cosine function are modulated Sequence;
SIN function modulation sequence determining module, for by the described second positive sequence and the described second anti-pleat sequence phase Subtract, obtain difference sequence, according to the difference sequence and the sine function of the second average initial phase, obtain SIN function modulation Sequence;
Multiplication sequence determining module, for set finely tune frequency, by it is described fine setting frequency discrete sine function with it is described Cosine function modulation sequence, which is multiplied, obtains the first multiplication sequence, by the discrete cosine function of the fine setting frequency and the sinusoidal letter Number modulation sequence, which is multiplied, obtains the second multiplication sequence, and the discrete sine function of the fine setting frequency is modulated with the SIN function Sequence, which is multiplied, obtains the 3rd multiplication sequence, by the discrete cosine function of the fine setting frequency and the cosine function modulation sequence phase Multiply and obtain the 4th multiplication sequence;
Frequency regulation block, for adjusting SIN function sequence according to first multiplication sequence and second multiplication sequence The frequency of row, the frequency of cosine function sequence is adjusted according to the 3rd multiplication sequence and the 4th multiplication sequence.
Include fundamental wave component, subharmonic composition and subharmonic composition etc. in actual electric power signal, but with fundamental wave component Amplitude maximum, so the non-integer for solving fundamental signal blocks, also just largely solve non-integer Spectral leakage problem caused by blocking, improves the degree of accuracy of sine parameter calculating.Several multiplication sequences of the invention by obtaining Row change the fundamental frequency of signal sequence, can realize in theory and the number of cycles of fundamental signal is blocked, so as to substantially increase The degree of accuracy that sine parameter calculates.
Brief description of the drawings
Fig. 1 is the schematic flow sheet of frequency power signal method for trimming embodiment of the present invention;
Fig. 2 is the schematic diagram of preliminary sequence of the present invention, the first positive sequence and the first anti-pleat sequence;
Fig. 3 is the structural representation of frequency power signal micro-tensioning system embodiment of the present invention;
Fig. 4 is the structural representation of frequency regulation block embodiment of the present invention.
Embodiment
It is below in conjunction with the accompanying drawings and preferably real further to illustrate the effect of the technological means of the invention taken and acquirement Example is applied, to technical scheme, carries out clear and complete description.
As shown in figure 1, a kind of frequency power signal method for trimming, including step:
S101, according to the lower limit of frequency power signal scope, preset sample frequency and default integer signal period number, obtain Preliminary sequence length;
S102, according to the preliminary sequence length electric power signal is sampled, obtain the preliminary sequence of the electric power signal Row;
S103, line frequency preliminary survey is entered to the preliminary sequence, obtain the preliminary frequency of the electric power signal, according to described first Synchronizing frequency obtains reference frequency;
S104, according to the preset sample frequency and the reference frequency, obtain the unit period sequence of the electric power signal Row length;
S105, according to the default integer signal period number and the unit period sequence length, obtain predetermined sequence length Degree;
S106, according to the predetermined sequence length and default starting point, the first positive sequence is obtained from the preliminary sequence Row, the first anti-pleat sequence is obtained according to the described first positive sequence;
S107, the first positive phase obtained according to the described first positive sequence, first is obtained according to the described first anti-pleat sequence Antiphase;
S108, the first average initial phase is obtained according to first positive phase and first antiphase;
S109, be averaged initial phase and preset phase value according to described first, phase fiducial value is obtained, according to the phase ratio Compared with value, the default starting point and the unit period sequence length, new starting point is obtained;
S110, according to the predetermined sequence length and the new starting point, it is positive that second is obtained from the preliminary sequence Sequence, the second anti-pleat sequence is obtained according to the second positive sequence;
S111, the second positive phase obtained according to the described second positive sequence, second is obtained according to the described second anti-pleat sequence Antiphase;
S112, the second average initial phase is obtained according to second positive phase and second antiphase;
S113, the described second positive sequence is added with the described second anti-pleat sequence, obtained and sequence, according to described and sequence The cosine function value of row and the described second average initial phase, obtains cosine function modulation sequence;
S114, the described second positive sequence and the described second anti-pleat sequence subtracted each other, difference sequence is obtained, according to the poor sequence The sine function of row and the described second average initial phase, obtains SIN function modulation sequence;
S115, fine setting frequency is set, by the discrete sine function of the fine setting frequency and the cosine function modulation sequence It is multiplied and obtains the first multiplication sequence, the discrete cosine function of the fine setting frequency is multiplied with the SIN function modulation sequence and obtained The second multiplication sequence is obtained, the discrete sine function of the fine setting frequency is multiplied with the SIN function modulation sequence and obtains the 3rd Multiplication sequence, the discrete cosine function of the fine setting frequency is multiplied with the cosine function modulation sequence and obtains the 4th multiplication sequence Row;
S116, the frequency for adjusting according to first multiplication sequence and second multiplication sequence SIN function sequence, root According to the 3rd multiplication sequence and the frequency of the 4th multiplication sequence adjustment cosine function sequence.
Actual electric power signal is a kind of sinusoidal signal based on fundamental wave component, and unless otherwise specified, electric power signal refers both to Fundamental signal, frequency power signal refer both to fundamental frequency.For step S101, power system frequency scope is typically (conspicuous in 45Hz Hereby) -55Hz, so the lower limit f of frequency power signal scopemin45Hz can be taken as.Default integer signal period number CCan root Set according to being actually needed, for example, by CIt is taken as 13.Preliminary sequence length can calculate according to formula (1):
Wherein, NstartFor preliminary sequence length;(int) represent to round;CTo preset integer signal period number;fminFor electricity The lower limit of force signal frequency range, unit Hz;F is preset sample frequency, unit Hz.
For step S102, the cosine function signal representation electric power signal of single fundamental frequency can be used, then preliminary sequence For formula (2):
Wherein, Xstart(n) it is preliminary sequence;A is signal amplitude, unit v;ωiFor signal frequency, when T is the sampling interval Between, f is preset sample frequency, and unit Hz, n are series of discrete number,For the initial phase of preliminary sequence, NstartGrown for preliminary sequence Degree.
For step S103, can by zero hand over method, the algorithm based on filtering, based on Wavelet Transformation Algorithm, based on nerve net The algorithm of network, the frequency algorithm based on DFT transform enter line frequency preliminary survey to preliminary sequence based on the frequency algorithm of phase difference, obtain Take preliminary frequency ωo.In one embodiment, the reference frequency ωso
For step S104, in one embodiment, the unit period sequence length of the electric power signal calculates, and is formula (3):
Wherein, NFor unit periodic sequence length;(int) it is round numbers;F is preset sample frequency, unit Hz;ωsFor Reference frequency.The error in 1 sampling interval be present in the unit period sequence length integer.
The predetermined sequence length computation, it is formula (4) in one embodiment for step S105:
N=(int) [(C-1)N] (4)
Wherein, N is predetermined sequence length, and (int) is round numbers, NFor the unit period sequence length, CIt is default Integer signal period number.
For step S106, in one embodiment, default starting point can be the 0.5 of the unit period sequence length Times, the first positive sequence, it is formula (5):
Wherein, Xstart(n) it is preliminary sequence, X+start(n) it is the first positive sequence, PstartTo preset starting point, NFor The unit period sequence length, (int) are round numbers, and A is signal amplitude, unit v, ωiFor signal frequency, T is between sampling Every the time, n is series of discrete number,For the first positive sequence initial phase, N predetermined sequence length.
The first anti-pleat sequence, it is formula (6):
Wherein, X-start(- n) is the first anti-pleat sequence, X+start(n) it is the first positive sequence, A is signal amplitude, unit V, ωiFor signal frequency, T is sampling interval duration, and n is series of discrete number, and β 1 is the first anti-pleat sequence initial phase, and N is default Sequence length.As shown in Fig. 2 the schematic diagram for preliminary sequence, the first positive sequence and the first anti-pleat sequence.
For step S107, in one embodiment, orthogonal mixing and integral and calculating are carried out according to the first positive sequence Result, obtain the first positive phase;According to the result that orthogonal mixing and integral and calculating are carried out to the first anti-pleat sequence, first is obtained Antiphase.When not considering the mixing interfering frequency of orthogonal mixing, orthogonal mixing is expressed as formula (7), and integral and calculating is expressed as formula (8):
Wherein, R+start(n) it is the first positive real frequency mixing sequence, I+start(n) sequence, R are mixed for the first weakened body resistance frequency-start (- n) is that the first anti-real frequency is mixed sequence, I-start(- n) is that the first anti-empty frequency is mixed sequence, cos (ωs) or cos (- ω TnsTn) For the discrete cosine function of reference frequency, sin (ωs) or sin (- ω TnsTn) it is for the discrete sine function of reference frequency, Ω Signal frequency ωiWith reference frequency ωsFrequency difference, T is sampling interval duration, and n is series of discrete number,For the first positive sequence Initial phase, β 1 are the first positive sequence initial phase, and N is predetermined sequence length.
Wherein, R+startFirst just real frequency integrated value, unit dimensionless, I+startFor the first weakened body resistance frequency integrated value, unit without Dimension, R-startFor the first anti-real frequency integrated value, unit dimensionless, I-startIt is immeasurable for the first anti-empty frequency mixing integrated value, unit Guiding principle, Ω are signal frequency ωiWith reference frequency ωsFrequency difference, T is sampling interval duration, and n is series of discrete number, and N is default sequence Row length,For the first positive sequence initial phase, β 1 is the first anti-pleat sequence initial phase, and N is predetermined sequence length.
In one embodiment, the calculating of the first positive phase and the first antiphase, it is expressed as formula (9):
Wherein, PH+startFor the first positive phase, PH-startFor the first antiphase, R+startIt is single for the first just real frequency integrated value Position dimensionless, I+startFor the first weakened body resistance frequency integrated value, unit dimensionless, R-startIt is immeasurable for the first anti-real frequency integrated value, unit Guiding principle, I-startFor the first anti-empty frequency mixing integrated value, unit dimensionless, Ω is signal frequency ωiWith reference frequency ωsFrequency difference, T For sampling interval duration, N is predetermined sequence length,For the first positive sequence initial phase, β 1 is the first anti-pleat sequence first phase Position.
For step S108, in one embodiment, the first average initial phase computational methods, formula (10) is expressed as:
Wherein, PHstart-avgFor the first average initial phase, PH+startFor the first positive phase, PH-startFor the first antiphase,For the first positive sequence initial phase, β 1 is the first anti-pleat sequence initial phase.
For step S109, in one embodiment, the preset phase value can be ± π/4;It is flat according to described first Equal initial phase and preset phase value, the step of obtaining phase fiducial value, can include:
If the described first average initial phase is less than or equal to pi/2 more than or equal to 0, the described first average first phase is subtracted according to π/4 Position obtains phase fiducial value;
If the described first average initial phase is more than or equal to-pi/2 is less than or equal to 0, according to-π/4 subtract described first it is average just Phase obtains phase fiducial value.
Specially formula (11):
Wherein, △ PHcomFor phase fiducial value, unit rad, PHstart-avgFor the first average initial phase.
In one embodiment, the new starting point calculates, and is formula (12):
Wherein, PnewFor new starting point, unit dimensionless, PstartTo preset starting point, △ PHcomIt is single for phase fiducial value Position rad, NFor unit periodic sequence length, (int) is round numbers.
For step S110, the second positive sequence and the second anti-pleat sequence are formula (13):
Wherein, X+end(n) it is the second positive sequence, X-end(- n) is the second anti-pleat sequence, PnewFor new starting point, unit without Dimension,For the second positive sequence initial phase, β 2 is the second anti-pleat sequence initial phase, ωiFor signal frequency, T is the sampling interval Time, n are series of discrete number, and N is predetermined sequence length.
For step S111, in one embodiment, orthogonal mixing and digital filtering are carried out according to the second positive sequence Result, obtain the second positive phase;According to the result that orthogonal mixing and digital filtering are carried out to the second anti-pleat sequence, second is obtained Antiphase.That is the computational methods of the second positive phase and the second antiphase, it is the result calculated based on orthogonal mixing and digital filtering. The digital filtering is made up of 6 grades of rectangular window arithmetic mean filters of 2 kinds of filtering parameters.
When not considering the mixing interfering frequency of orthogonal mixing, orthogonal mixing is expressed as formula (14), and the 6 of 2 kinds of filtering parameters Level rectangular window arithmetic mean filter filtering calculation expression is formula (15):
Wherein, R+end(n) it is the second positive real frequency mixing sequence, I+end(n) sequence, R are mixed for the second weakened body resistance frequency-end(-n) For the second anti-real frequency mixing sequence, I-end(- n) is that the second anti-empty frequency is mixed sequence, cos (ωs) or cos (- ω TnsTn it is) ginseng Examine the discrete cosine function of frequency, sin (ωs) or sin (- ω TnsTn it is) discrete sine function of reference frequency, Ω is signal Frequencies omegaiWith reference frequency ωsFrequency difference, T is sampling interval duration, and n is series of discrete number,For at the beginning of the first positive sequence Phase, β 1 are the first anti-pleat sequence initial phase, and N is predetermined sequence length.
Wherein, R+endFor the second just real frequency digital filtering final value, unit dimensionless;I+endFor the second weakened body resistance frequency digital filtering Final value, unit dimensionless;R-endFor the second anti-digital filtering final value, unit dimensionless;I-endIt is whole for the second anti-empty frequency digital filtering Value, unit dimensionless;Ω is signal frequency ωiWith reference frequency ωsFrequency difference;K (Ω) is amplitude of the digital filtering in frequency difference Ω Gain, unit dimensionless;T is sampling interval duration;For the second positive sequence initial phase;β 2 is the second anti-pleat sequence first phase Position;ND1For filtering parameter 1, i.e., to ND1Individual continuous centrifugal pump is added, and then takes its arithmetic mean of instantaneous value defeated as this filter value Go out;ND2For filtering parameter 2, i.e., to ND2Individual continuous centrifugal pump is added, and then takes its arithmetic mean of instantaneous value defeated as this filter value Go out;NDSequence length is used for digital filtering, is the summation of 6 grades of rectangular window arithmetic mean filter filtering parameters in quantity, it is small In equal to predetermined sequence length N.
In one embodiment, filtering parameter ND1Value is 1.5 times of the unit period sequence length of the reference frequency, Purpose carries out depth suppression to being mixed interfering frequency caused by 1/3 subharmonic;Filtering parameter ND2Value is the reference frequency 2 times of unit period sequence length, purpose carries out depth to being mixed interfering frequency caused by direct current, 1/2 gradation, subharmonic etc. Suppress.6 grades of rectangular window arithmetic mean filters filtering of 2 kinds of filtering parameters, which calculates, needs to use signal period sequence length 10.5 times.
Filtering parameter ND1With filtering parameter ND2It is calculated as formula (16):
Wherein, ND1For digital filter parameters 1, unit dimensionless, (int) is round numbers, ND2It is single for digital filter parameters 2 Position dimensionless, NFor unit periodic sequence length.
In one embodiment, the computational methods of the second positive phase and the second antiphase, it is expressed as formula (17):
Wherein, PH+endFor the second positive phase, PH-endFor the second antiphase, R+endFor the second just real frequency integrated value, unit without Dimension, I+endFor the second weakened body resistance frequency integrated value, unit dimensionless, R-endFor the second anti-real frequency integrated value, unit dimensionless, I-end For the second anti-empty frequency mixing integrated value, unit dimensionless, Ω is signal frequency ωiWith reference frequency ωsFrequency difference, T for sampling between Every the time, NDSequence length is used for digital filtering,For the second positive sequence initial phase, β 2 is the second anti-pleat sequence first phase Position.
For step S112, the second average initial phase computational methods, formula (18) is expressed as:
Wherein, PHend-avgFor the second average initial phase, PH+endFor the second positive phase, PH-endFor the second antiphase,For Second positive sequence initial phase, β 2 are the second positive sequence initial phase.
For step S113, cosine function modulation sequence is expressed as formula (19):
Wherein, Xcos(n) it is cosine function modulation sequence;A is cosine function modulation sequence amplitude, unit v;For cosine function modulation sequence initial phase, ωiFor signal frequency, T is sampling interval duration, and n is series of discrete Number, N is predetermined sequence length,For the second positive sequence initial phase, β 2 is the second anti-pleat sequence initial phase.
For step S114, SIN function modulation sequence is expressed as formula (20):
Wherein, Xsin(n) it is SIN function modulation sequence, A is SIN function modulation sequence amplitude, unit v,For cosine function modulation sequence initial phase, ωiSignal frequency, T are sampling interval duration, and n is series of discrete number, N is predetermined sequence length,For the second positive sequence initial phase, β 2 is the second anti-pleat sequence initial phase.
For step S115, in one embodiment, fine setting frequency is the positive reality less than or equal to actual signal frequency 1% Number, unit rad/s, is expressed as formula (21):
Wherein, ΩsetTo finely tune frequency, unit rad/s.
In one embodiment, the first multiplication sequence is formula (22):
In one embodiment, the second multiplication sequence is formula (23):
In one embodiment, the 3rd multiplication sequence is formula (24):
In one embodiment, the 4th multiplication sequence is formula (25):
For step S116, in one embodiment, adjusted according to first multiplication sequence and second multiplication sequence The frequency of whole SIN function sequence, cosine function sequence is adjusted according to the 3rd multiplication sequence and the 4th multiplication sequence The step of frequency, can include:
Second multiplication sequence is added with first multiplication sequence, improves the frequency of SIN function sequence;
Second multiplication sequence and first multiplication sequence are subtracted each other, reduce the frequency of SIN function sequence;
4th multiplication sequence and the 3rd multiplication sequence are subtracted each other, improve the frequency of cosine function sequence;
4th multiplication sequence is added with the 3rd multiplication sequence, reduces the frequency of cosine function sequence.
Wherein, second multiplication sequence is added with first multiplication sequence, SIN function sequence frequency can be improved, For formula (26):
Wherein, Xsin+f(n) to improve the frequency sine sequence of function, sequence frequency improves Ωset
Second multiplication sequence and first multiplication sequence are subtracted each other, SIN function sequence frequency can be reduced, is formula (27):
Wherein, Xsin-f(n) to reduce the frequency sine sequence of function, sequence frequency reduces Ωset
4th multiplication sequence and the 3rd multiplication sequence are subtracted each other, cosine function sequence frequency can be improved, is formula (28):
Wherein, Xcos+f(n) to improve frequency cosine function sequence, sequence frequency improves Ωset
4th multiplication sequence is added with the 3rd multiplication sequence, cosine function sequence frequency can be reduced, is formula (29):
Wherein, Xcos-f(n) to reduce frequency cosine function sequence, sequence frequency reduces Ωset
Based on same inventive concept, the present invention also provides a kind of frequency power signal micro-tensioning system, right below in conjunction with the accompanying drawings Embodiments of systems of the invention are described in detail.
As shown in figure 3, a kind of frequency power signal micro-tensioning system, including:
Preliminary sequence length determination modul 101, for the lower limit according to frequency power signal scope, preset sample frequency and Default integer signal period number, obtains preliminary sequence length;
Preliminary sequence acquisition module 102, for being sampled according to the preliminary sequence length to electric power signal, obtain institute State the preliminary sequence of electric power signal;
Reference frequency determining module 103, for entering line frequency preliminary survey to the preliminary sequence, obtain the electric power signal Preliminary frequency, reference frequency is obtained according to the preliminary frequency;
Unit period sequence length determining module 104, for according to the preset sample frequency and the reference frequency, obtaining Obtain the unit period sequence length of the electric power signal;
Predetermined sequence length determination modul 105, for according to the default integer signal period number and the unit period Sequence length, obtain predetermined sequence length;
First ray acquisition module 106, for according to the predetermined sequence length and default starting point, from the preliminary sequence The first positive sequence is obtained in row, the first anti-pleat sequence is obtained according to the described first positive sequence;
First positive and negative phase determination module 107, for obtaining the first positive phase according to the described first positive sequence, according to institute State the first anti-pleat sequence and obtain the first antiphase;
First average initial phase determining module 108, for according to first positive phase and first antiphase acquisition First average initial phase;
New starting point determining module 109, for according to the described first average initial phase and preset phase value, obtaining phase ratio Compared with value, according to the phase fiducial value, the default starting point and the unit period sequence length, new starting point is obtained;
Second retrieval module 110, for according to the predetermined sequence length and the new starting point, from described preliminary The second positive sequence is obtained in sequence, the second anti-pleat sequence is obtained according to the second positive sequence;
Second positive and negative phase determination module 111, for obtaining the second positive phase according to the described second positive sequence, according to institute State the second anti-pleat sequence and obtain the second antiphase;
Second average initial phase determining module 112, for according to second positive phase and second antiphase acquisition Second average initial phase;
Cosine function modulation sequence determining module 113, for by the described second positive sequence and the described second anti-pleat sequence It is added, obtains and sequence, according to described and sequence and the cosine function value of the second average initial phase, obtains cosine function and adjust Sequence processed;
SIN function modulation sequence determining module 114, for by the described second positive sequence and the described second anti-pleat sequence Subtract each other, obtain difference sequence, according to the difference sequence and the sine function of the second average initial phase, obtain SIN function and adjust Sequence processed;
Multiplication sequence determining module 115, frequency is finely tuned for setting, by the discrete sine function of the fine setting frequency and institute State the multiplication of cosine function modulation sequence and obtain the first multiplication sequence, by the discrete cosine function of the fine setting frequency and the sine FUNCTION MODULATION sequence, which is multiplied, obtains the second multiplication sequence, and the discrete sine function of the fine setting frequency is adjusted with the SIN function Sequence processed, which is multiplied, obtains the 3rd multiplication sequence, by the discrete cosine function of the fine setting frequency and the cosine function modulation sequence It is multiplied and obtains the 4th multiplication sequence;
Frequency regulation block 116, for adjusting sinusoidal letter according to first multiplication sequence and second multiplication sequence The frequency of Number Sequence, the frequency of cosine function sequence is adjusted according to the 3rd multiplication sequence and the 4th multiplication sequence.
As shown in figure 4, in one embodiment, the frequency regulation block 116 can include:
First SIN function sequence frequency adjustment unit 1161, for by second multiplication sequence and first multiplication Sequence is added, and improves the frequency of SIN function sequence;
Second SIN function sequence frequency adjustment unit 1162, for by second multiplication sequence and first multiplication Sequence is subtracted each other, and reduces the frequency of SIN function sequence;
First cosine function sequence frequency adjustment unit 1163, for by the 4th multiplication sequence and the 3rd multiplication Sequence is subtracted each other, and improves the frequency of cosine function sequence;
Second cosine function sequence frequency adjustment unit 1164, for by the 4th multiplication sequence and the 3rd multiplication Sequence is added, and reduces the frequency of cosine function sequence.
In one embodiment, the multiplication sequence determining module 115 can be according to expression formula X1 (n)=Xcos(n)sin (ΩsetTn the first multiplication sequence X1 (n)) is obtained, wherein, Xcos(n) it is cosine function modulation sequence, sin (ΩsetTn it is) described Finely tune the discrete sine function of frequency, ΩsetTo finely tune frequency, T is sampling interval duration, and n is series of discrete number.
In one embodiment, the multiplication sequence determining module 115 can be according to expression formula X2 (n)=Xsin(n)cos (ΩsetTn the second multiplication sequence) is obtained, wherein, Xsin(n) it is SIN function modulation sequence, cos (ΩsetTn) it is the fine setting The discrete cosine function of frequency, ΩsetTo finely tune frequency, T is sampling interval duration, and n is series of discrete number.
In one embodiment, the multiplication sequence determining module 115 can be according to expression formula X3 (n)=Xsin(n)sin (ΩsetTn the 3rd multiplication sequence) is obtained, wherein, Xsin(n) it is SIN function modulation sequence, sin (ΩsetTn) it is the fine setting The discrete sine function of frequency, ΩsetTo finely tune frequency, T is sampling interval duration, and n is series of discrete number;
In one embodiment, the multiplication sequence determining module 115 can be according to expression formula X4 (n)=Xcos(n)cos (ΩsetTn the 4th multiplication sequence) is obtained, wherein, Xcos(n) it is cosine function modulation sequence, cos (ΩsetTn) it is the fine setting The discrete cosine function of frequency, ΩsetTo finely tune frequency, T is sampling interval duration, and n is series of discrete number.
The other technical characteristics of present system are identical with the inventive method, will not be described here.
Each technical characteristic of embodiment described above can be combined arbitrarily, to make description succinct, not to above-mentioned reality Apply all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited In contradiction, the scope that this specification is recorded all is considered to be.
Embodiment described above only expresses the several embodiments of the present invention, and its description is more specific and detailed, but simultaneously Can not therefore it be construed as limiting the scope of the patent.It should be pointed out that come for one of ordinary skill in the art Say, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to the protection of the present invention Scope.Therefore, the protection domain of patent of the present invention should be determined by the appended claims.

Claims (10)

1. a kind of frequency power signal method for trimming, it is characterised in that including step:
According to the lower limit of frequency power signal scope, preset sample frequency and default integer signal period number, preliminary sequence is obtained Length;
Electric power signal is sampled according to the preliminary sequence length, obtains the preliminary sequence of the electric power signal;
Line frequency preliminary survey is entered to the preliminary sequence, obtains the preliminary frequency of the electric power signal, is obtained according to the preliminary frequency To reference frequency;
According to the preset sample frequency and the reference frequency, the unit period sequence length of the electric power signal is obtained;
According to the default integer signal period number and the unit period sequence length, predetermined sequence length is obtained;
According to the predetermined sequence length and default starting point, the first positive sequence is obtained from the preliminary sequence, according to institute State the first positive sequence and obtain the first anti-pleat sequence;
First positive phase is obtained according to the described first positive sequence, the first antiphase is obtained according to the described first anti-pleat sequence;
First average initial phase is obtained according to first positive phase and first antiphase;
According to the described first average initial phase and preset phase value, phase fiducial value is obtained, according to the phase fiducial value, described Default starting point and the unit period sequence length, obtain new starting point;
According to the predetermined sequence length and the new starting point, the second positive sequence is obtained from the preliminary sequence, according to Second positive sequence obtains the second anti-pleat sequence;
Second positive phase is obtained according to the described second positive sequence, the second antiphase is obtained according to the described second anti-pleat sequence;
Second average initial phase is obtained according to second positive phase and second antiphase;
Described second positive sequence is added with the described second anti-pleat sequence, obtained and sequence, according to described and sequence and described The cosine function value of second average initial phase, according to expression formulaCosine function is obtained to adjust Sequence X processedcos(n), wherein n=0,1,2 ..., N-1, X+end(n) it is the described second positive sequence, X-end(- n) is described second Anti- pleat sequence, PHend-avgFor the described second average initial phase, n is series of discrete number, and N is the predetermined sequence length;
Described second positive sequence and the described second anti-pleat sequence are subtracted each other, obtain difference sequence, according to the difference sequence and described The sine function of second average initial phase, according to expression formulaSIN function is obtained to adjust Sequence X processedsin(n), wherein n=0,1,2 ..., N-1, X+end(n) it is the described second positive sequence, X-end(- n) is described second Anti- pleat sequence, PHend-avgFor the described second average initial phase, n is series of discrete number, and N is the predetermined sequence length;
Fine setting frequency is set, the discrete sine function of the fine setting frequency is multiplied with the cosine function modulation sequence and obtains the One multiplication sequence, the discrete cosine function of the fine setting frequency is multiplied with the SIN function modulation sequence and obtains the second multiplication Sequence, the discrete sine function of the fine setting frequency is multiplied with the SIN function modulation sequence and obtains the 3rd multiplication sequence, The discrete cosine function of the fine setting frequency is multiplied with the cosine function modulation sequence and obtains the 4th multiplication sequence;
According to first multiplication sequence and the frequency of second multiplication sequence adjustment SIN function sequence, according to the described 3rd The frequency of multiplication sequence and the 4th multiplication sequence adjustment cosine function sequence.
2. frequency power signal method for trimming according to claim 1, it is characterised in that according to first multiplication sequence The frequency of SIN function sequence is adjusted with second multiplication sequence, according to the 3rd multiplication sequence and the 4th multiplication sequence The step of frequency of row adjustment cosine function sequence, includes:
Second multiplication sequence is added with first multiplication sequence, improves the frequency of SIN function sequence;
Second multiplication sequence and first multiplication sequence are subtracted each other, reduce the frequency of SIN function sequence;
4th multiplication sequence and the 3rd multiplication sequence are subtracted each other, improve the frequency of cosine function sequence;
4th multiplication sequence is added with the 3rd multiplication sequence, reduces the frequency of cosine function sequence.
3. frequency power signal method for trimming according to claim 1, it is characterised in that according to expression formula X1 (n)=Xcos (n)sin(ΩsetTn the first multiplication sequence X1 (n)) is obtained, wherein, Xcos(n) it is cosine function modulation sequence, sin (ΩsetTn) For the discrete sine function of the fine setting frequency, ΩsetTo finely tune frequency, T is sampling interval duration, and n is series of discrete number.
4. frequency power signal method for trimming according to claim 1, it is characterised in that according to expression formula X2 (n)=Xsin (n)cos(ΩsetTn the second multiplication sequence) is obtained, wherein, Xsin(n) it is SIN function modulation sequence, cos (ΩsetTn it is) institute State the discrete cosine function of fine setting frequency, ΩsetTo finely tune frequency, T is sampling interval duration, and n is series of discrete number.
5. the frequency power signal method for trimming according to Claims 1-4 any one, it is characterised in that:
According to expression formula X3 (n)=Xsin(n)sin(ΩsetTn the 3rd multiplication sequence) is obtained, wherein, Xsin(n) it is SIN function Modulation sequence, sin (ΩsetTn it is) discrete sine function of the fine setting frequency, ΩsetTo finely tune frequency, when T is the sampling interval Between, n is series of discrete number;
According to expression formula X4 (n)=Xcos(n)cos(ΩsetTn the 4th multiplication sequence) is obtained, wherein, Xcos(n) it is cosine function Modulation sequence, cos (ΩsetTn it is) the discrete cosine function of the fine setting frequency, ΩsetTo finely tune frequency, when T is the sampling interval Between, n is series of discrete number.
A kind of 6. frequency power signal micro-tensioning system, it is characterised in that including:
Preliminary sequence length determination modul, for the lower limit according to frequency power signal scope, preset sample frequency and preset whole Number signal period number, obtains preliminary sequence length;
Preliminary sequence acquisition module, for being sampled according to the preliminary sequence length to electric power signal, obtain the electric power The preliminary sequence of signal;
Reference frequency determining module, for entering line frequency preliminary survey to the preliminary sequence, obtain the first cadence of the electric power signal Rate, reference frequency is obtained according to the preliminary frequency;
Unit period sequence length determining module, for according to the preset sample frequency and the reference frequency, described in acquisition The unit period sequence length of electric power signal;
Predetermined sequence length determination modul, for according to the default integer signal period number and unit period sequence length Degree, obtain predetermined sequence length;
First ray acquisition module, for according to the predetermined sequence length and default starting point, being obtained from the preliminary sequence The first positive sequence is obtained, the first anti-pleat sequence is obtained according to the described first positive sequence;
First positive and negative phase determination module, for obtaining the first positive phase according to the described first positive sequence, according to described first Anti- pleat sequence obtains the first antiphase;
First average initial phase determining module, it is average for obtaining first according to first positive phase and first antiphase Initial phase;
New starting point determining module, for according to the described first average initial phase and preset phase value, obtaining phase fiducial value, root According to the phase fiducial value, the default starting point and the unit period sequence length, new starting point is obtained;
Second retrieval module, for according to the predetermined sequence length and the new starting point, from the preliminary sequence The second positive sequence is obtained, the second anti-pleat sequence is obtained according to the second positive sequence;
Second positive and negative phase determination module, for obtaining the second positive phase according to the described second positive sequence, according to described second Anti- pleat sequence obtains the second antiphase;
Second average initial phase determining module, it is average for obtaining second according to second positive phase and second antiphase Initial phase;
Cosine function modulation sequence determining module, for the described second positive sequence to be added with the described second anti-pleat sequence, obtain Arrive and sequence, according to described and sequence and the cosine function value of the second average initial phase, according to expression formulaObtain cosine function modulation sequence Xcos(n), wherein n=0,1,2 ..., N-1, X+end (n) it is the described second positive sequence, X-end(- n) is the described second anti-pleat sequence, PHend-avgFor the described second average initial phase, n For series of discrete number, N is the predetermined sequence length;
SIN function modulation sequence determining module, for the described second positive sequence and the described second anti-pleat sequence to be subtracted each other, obtain To difference sequence, according to the difference sequence and the sine function of the second average initial phase, according to expression formulaObtain SIN function modulation sequence Xsin(n), wherein n=0,1,2 ..., N-1, X+end (n) it is the described second positive sequence, X-end(- n) is the described second anti-pleat sequence, PHend-avgFor the described second average initial phase, n For series of discrete number, N is the predetermined sequence length;
Multiplication sequence determining module, frequency is finely tuned for setting, by the discrete sine function of the fine setting frequency and the cosine FUNCTION MODULATION sequence, which is multiplied, obtains the first multiplication sequence, and the discrete cosine function of the fine setting frequency is adjusted with the SIN function Sequence processed, which is multiplied, obtains the second multiplication sequence, by the discrete sine function of the fine setting frequency and the SIN function modulation sequence It is multiplied and obtains the 3rd multiplication sequence, the discrete cosine function of the fine setting frequency is multiplied with the cosine function modulation sequence and obtained Obtain the 4th multiplication sequence;
Frequency regulation block, for adjusting SIN function sequence according to first multiplication sequence and second multiplication sequence Frequency, the frequency of cosine function sequence is adjusted according to the 3rd multiplication sequence and the 4th multiplication sequence.
7. frequency power signal micro-tensioning system according to claim 6, it is characterised in that the frequency regulation block bag Include:
First SIN function sequence frequency adjustment unit, for by second multiplication sequence and the first multiplication sequence phase Add, improve the frequency of SIN function sequence;
Second SIN function sequence frequency adjustment unit, for by second multiplication sequence and the first multiplication sequence phase Subtract, reduce the frequency of SIN function sequence;
First cosine function sequence frequency adjustment unit, for by the 4th multiplication sequence and the 3rd multiplication sequence phase Subtract, improve the frequency of cosine function sequence;
Second cosine function sequence frequency adjustment unit, for by the 4th multiplication sequence and the 3rd multiplication sequence phase Add, reduce the frequency of cosine function sequence.
8. frequency power signal micro-tensioning system according to claim 6, it is characterised in that the multiplication sequence determining module According to expression formula X1 (n)=Xcos(n)sin(ΩsetTn the first multiplication sequence X1 (n)) is obtained, wherein, Xcos(n) it is cosine function Modulation sequence, sin (ΩsetTn it is) discrete sine function of the fine setting frequency, ΩsetTo finely tune frequency, when T is the sampling interval Between, n is series of discrete number.
9. frequency power signal micro-tensioning system according to claim 6, it is characterised in that the multiplication sequence determining module According to expression formula X2 (n)=Xsin(n)cos(ΩsetTn the second multiplication sequence) is obtained, wherein, Xsin(n) modulated for SIN function Sequence, cos (ΩsetTn it is) the discrete cosine function of the fine setting frequency, ΩsetTo finely tune frequency, T is sampling interval duration, n For series of discrete number.
10. the frequency power signal micro-tensioning system according to claim 6 to 9 any one, it is characterised in that:
The multiplication sequence determining module is according to expression formula X3 (n)=Xsin(n)sin(ΩsetTn the 3rd multiplication sequence) is obtained, its In, Xsin(n) it is SIN function modulation sequence, sin (ΩsetTn it is) discrete sine function of the fine setting frequency, ΩsetTo be micro- Frequency modulation rate, T are sampling interval duration, and n is series of discrete number;
The multiplication sequence determining module is according to expression formula X4 (n)=Xcos(n)cos(ΩsetTn the 4th multiplication sequence) is obtained, its In, Xcos(n) it is cosine function modulation sequence, cos (ΩsetTn it is) the discrete cosine function of the fine setting frequency, ΩsetTo be micro- Frequency modulation rate, T are sampling interval duration, and n is series of discrete number.
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