CN105548700B - Obtain the method and system of the raising frequency orthogonal sequence of electric power signal - Google Patents
Obtain the method and system of the raising frequency orthogonal sequence of electric power signal Download PDFInfo
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Abstract
The invention discloses it is a kind of obtain electric power signal raising frequency orthogonal sequence method and system, the described method includes:Obtain electric power signal preliminary sequence length and preliminary sequence;To preliminary sequence into line frequency preliminary survey, reference frequency is set;Electric power signal unit period sequence length and predetermined sequence length are obtained, further obtains first positive/anti-pleat sequence;Averagely initial phase is obtained for the first time according to first positive/anti-pleat sequence;Further according to first averagely initial phase and the first phase fiducial value of ± π/4 and new starting point obtain again positive/anti-pleat sequence, be averaged initial phase again;According to positive/anti-pleat sequence again, be averaged initial phase again, obtains remaining/SIN function modulation sequence;The multiplication sequence of first/second/the 3rd/the 4th is obtained according to default fine tuning frequency, remaining/SIN function modulation sequence, further obtain improve frequency just/cosine function Sequence composition improves frequency orthogonal sequence.The present invention improves the accuracy that sine parameter calculates, and is suitble to application.
Description
Technical field
The present invention relates to technical field of electric power, more particularly to a kind of raising frequency orthogonal sequence for obtaining electric power signal
Method and system.
Background technology
Frequency measurement, phase measurement, amplitude measurement of electric system etc. are the measurement of sine parameter in itself.Quickly
Fourier transformation and discrete Fourier transform are to realize the basic skills of sine parameter measurement, widely should be had in electric system
With.But the above method is blocked in the non-integer of signal sampling process, causes spectrum leakage, and spectrum leakage can generate phase
The error answered.
In terms of electric system sine parameter measurement, there are many measuring methods, are repaiied such as adding window mouth functional based method, using interpolation
Correction method etc. reduces the influence of spectrum leakage problem.But above-mentioned measuring method measurement accuracy is low, is being not suitable for high accuracy just
The measurement of string parameter.
The content of the invention
Based on the above situation, the present invention proposes a kind of method of raising frequency orthogonal sequence for obtaining electric power signal and is
System improves the accuracy of sine parameter measurement.
To achieve these goals, the embodiment of technical solution of the present invention is:
A kind of method for the raising frequency orthogonal sequence for obtaining electric power signal, comprises the following steps:
According to the lower limit of frequency power signal scope, preset sample frequency and default integer signal period number, described in acquisition
The preliminary sequence length of electric power signal;
The electric power signal is sampled according to the preliminary sequence length, obtains the preliminary sequence of the electric power signal
Row;
To the preliminary sequence into line frequency preliminary survey, the preliminary frequency of the electric power signal is generated, and according to described preliminary
Frequency sets the reference frequency of the electric power signal;
According to the preset sample frequency and the reference frequency, the unit period sequence for obtaining the electric power signal is long
Degree;
According to the default integer signal period number and the unit period sequence length, the pre- of the electric power signal is obtained
If sequence length;
According to default starting point and the predetermined sequence length, the first of the electric power signal is obtained from the preliminary sequence
Secondary forward direction sequence;
The first anti-pleat sequence of the electric power signal is obtained according to the first positive sequence;
The first positive phase of the electric power signal is obtained according to the first positive sequence, and according to the first anti-pleat sequence
Row obtain the first antiphase of the electric power signal;
The initial phase that is averaged for the first time of the electric power signal is obtained according to the first positive phase and the first antiphase;
By the averagely initial phase for the first time compared with ± π/4, the first phase bit comparison compared with ± π/4 is obtained
Value, and according to the first phase fiducial value and the default starting point, obtain new starting point;
According to the new starting point and the predetermined sequence length, the electric power signal is obtained from the preliminary sequence
Positive sequence again, and according to the pleat sequence anti-again of the positive sequence acquisition again electric power signal;
The positive phase again of the electric power signal is obtained according to the sequence positive again, and according to the pleat sequence anti-again
Row obtain the antiphase again of the electric power signal;
The initial phase that is averaged again of the electric power signal is obtained according to the positive phase again and the antiphase again;
The sequence of forward direction again is added with the pleat sequence anti-again, and according to the result after addition and it is described again
Average initial phase obtains the cosine function modulation sequence of the electric power signal;
The sequence positive again and the pleat sequence anti-again are subtracted each other, and according to the result after subtracting each other and it is described again
Average initial phase obtains the SIN function modulation sequence of the electric power signal;
The discrete sine function of default fine tuning frequency with the cosine function modulation sequence is multiplied and obtains the electric power letter
Number the first multiplication sequence, the discrete cosine function of the default fine tuning frequency is multiplied with the SIN function modulation sequence and obtains
The second multiplication sequence of the electric power signal is obtained, the discrete sine function of default fine tuning frequency is modulated into sequence with the SIN function
Row, which are multiplied, obtains the 3rd multiplication sequence of the electric power signal, by the discrete cosine function of the default fine tuning frequency with it is described remaining
String FUNCTION MODULATION sequence, which is multiplied, obtains the 4th multiplication sequence of the electric power signal;
First multiplication sequence with second multiplication sequence is added, is obtaining the raising frequency of the electric power signal just
The string sequence of function;4th multiplication sequence with the 3rd multiplication sequence is subtracted each other, obtains the raising frequency of the electric power signal
Rate cosine function sequence.
The electric power letter is obtained according to the raising frequency sine sequence of function and the raising frequency cosine function sequence
Number raising frequency orthogonal sequence.
A kind of system for the raising frequency orthogonal sequence for obtaining electric power signal, including:
Preliminary sequence length modules, for lower limit, the preset sample frequency and default whole according to frequency power signal scope
Number signal period number obtains the preliminary sequence length of the electric power signal;
Preliminary sequence module, for being sampled according to the preliminary sequence length to the electric power signal, described in acquisition
The preliminary sequence of electric power signal;
Frequency preliminary survey module, for into line frequency preliminary survey, generating the first cadence of the electric power signal to the preliminary sequence
Rate, and according to the reference frequency of the preliminary frequency setting electric power signal;
Unit period sequence length 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 modules, for long according to the default integer signal period number and the unit period sequence
Degree obtains the predetermined sequence length of the electric power signal;
First forward direction block, for the default starting point of basis and the predetermined sequence length, from the preliminary sequence
The middle first positive sequence for obtaining the electric power signal;
First anti-pleat block, for obtaining the first anti-pleat sequence of the electric power signal according to the first positive sequence
Row;
First phase module, for obtaining the first positive phase of the electric power signal according to the first positive sequence, and
The first antiphase of the electric power signal is obtained according to the first anti-pleat sequence;
Be averaged initial phase module for the first time, for obtaining the electric power according to the first positive phase and the first antiphase
The initial phase that is averaged for the first time of signal;
Phase bits comparison module, for the averagely initial phase for the first time compared with ± π/4, to be obtained and ± π/4
The first phase fiducial value compared, and according to the first phase fiducial value and the default starting point, obtain new starting point;
Block again, for according to the new starting point and the predetermined sequence length, from the preliminary sequence
The sequence positive again of the electric power signal is obtained, and the anti-again of the electric power signal is obtained according to the sequence positive again
Pleat sequence;
Phase module again, for positive sequence to obtain the positive phase again of the electric power signal again according to, and
The antiphase again of the electric power signal is obtained according to the pleat sequence anti-again;
Be averaged initial phase module again, for positive phase and the antiphase again to obtain the electric power again according to
The initial phase that is averaged again of signal;
Cosine function modulation sequence module, for positive sequence to be added with the pleat sequence anti-again again by described in, and
According to the result after addition and the initial phase that is averaged again, the cosine function modulation sequence of the electric power signal is obtained;
SIN function modulation sequence module, for the sequence positive again and the pleat sequence anti-again to be subtracted each other, and
According to the result after subtracting each other and the initial phase that is averaged again, the SIN function modulation sequence of the electric power signal is obtained;
Multiplication sequence module, for by it is default fine tuning frequency discrete sine function and the cosine function modulation sequence phase
Multiply the first multiplication sequence for obtaining the electric power signal, by the discrete cosine function of the default fine tuning frequency and the sinusoidal letter
Number modulation sequence, which is multiplied, obtains the second multiplication sequence of the electric power signal, by the discrete sine function of default fine tuning frequency and institute
The 3rd multiplication sequence that the multiplication of SIN function modulation sequence obtains the electric power signal is stated, by the discrete of the default fine tuning frequency
Cosine function is multiplied with the cosine function modulation sequence obtains the 4th multiplication sequence of the electric power signal;
Frequency function block is improved, for first multiplication sequence to be added with second multiplication sequence, is obtained
Obtain the raising frequency sine sequence of function of the electric power signal;By the 4th multiplication sequence and the 3rd multiplication sequence phase
Subtract, obtain the raising frequency cosine function sequence of the electric power signal.
Improve frequency orthogonal block, for according to it is described raising the frequency sine sequence of function and it is described raising frequency more than
The string sequence of function obtains the raising frequency orthogonal sequence of the electric power signal.
Compared with prior art, beneficial effects of the present invention are:The present invention obtains the raising frequency orthogonal sequence of electric power signal
The method and system of row according to the lower limit of frequency power signal scope, preset sample frequency and preliminary design integer signal period number, obtains
Preliminary sequence length is obtained, and electric power signal is tentatively sampled, obtains preliminary sequence;To preliminary sequence into line frequency preliminary survey,
Preliminary frequency is generated, sets reference frequency;According to preset sample frequency and reference frequency, unit period sequence length is obtained;Root
According to default integer signal period number and unit period sequence length, predetermined sequence length is obtained;It is obtained from preliminary sequence first
Positive sequence further obtains first anti-pleat sequence;According to first positive sequence, first anti-pleat sequence obtain first positive phase,
First antiphase further obtains for the first time averagely initial phase;First phase fiducial value is obtained compared with ± π/4, further
Obtain new starting point;According to new starting point and predetermined sequence length, positive sequence, again anti-pleat sequence again are obtained, further
Obtain again positive phase, again antiphase, again be averaged initial phase;According to positive phase again, again antiphase, again it is average just
Phase obtains cosine function modulation sequence, SIN function modulation sequence;According to it is default fine tuning frequency, cosine function modulation sequence,
SIN function modulation sequence, which obtains, to be improved the frequency sine sequence of function, improves frequency cosine function sequence, according to raising frequency just
The string sequence of function and raising frequency cosine function sequence are improved frequency orthogonal sequence, by the fundamental wave frequency for improving signal sequence
Rate is, it can be achieved that block the number of cycles of fundamental signal, with the amplitude maximum of fundamental wave component, solution fundamental signal in electric power signal
Number of cycles truncated problem, improve sine parameter calculating accuracy, be suitble to practical application.
Description of the drawings
Fig. 1 is the method flow diagram for the raising frequency orthogonal sequence that electric power signal is obtained in one embodiment;
Fig. 2 is first positive sequence and first anti-pleat sequence diagram in one embodiment;
Fig. 3 is the system structure diagram for the raising frequency orthogonal sequence that electric power signal is obtained in one embodiment.
Specific embodiment
In order to make the object, technical solutions and advantages of the present invention clearer, the present invention is made below in conjunction with attached drawing into
One step it is described in detail.
Although the step in the present invention is arranged with label, it is not used to limit the precedence of step, unless
Specify the order of step or based on the execution of certain step needs other steps, otherwise the relative rank of step is
It is adjustable.
The method that the raising frequency orthogonal sequence of electric power signal is obtained in one embodiment, as shown in Figure 1, including following step
Suddenly:
Step S101:According to the lower limit of frequency power signal scope, preset sample frequency and default integer signal period number,
Obtain the preliminary sequence length of the electric power signal;
Step S102:The electric power signal is sampled according to the preliminary sequence length, obtains the electric power signal
Preliminary sequence;
Step S103:To the preliminary sequence into line frequency preliminary survey, the preliminary frequency of the electric power signal is generated, and according to
The preliminary frequency sets the reference frequency of the electric power signal;
Step S104:According to the preset sample frequency and the reference frequency, the unit for obtaining the electric power signal is all
Phase sequence length;
Step S105:According to the default integer signal period number and the unit period sequence length, the electricity is obtained
The predetermined sequence length of force signal;
Step S106:According to default starting point and the predetermined sequence length, the electricity is obtained from the preliminary sequence
The first positive sequence of force signal;
Step S107:The first anti-pleat sequence of the electric power signal is obtained according to the first positive sequence;
Step S108:The first positive phase of the electric power signal is obtained according to the first positive sequence, and according to described
First anti-pleat sequence obtains the first antiphase of the electric power signal;
Step S109:The first average of the electric power signal is obtained according to the first positive phase and the first antiphase
Initial phase;
Step S110:By the averagely initial phase for the first time compared with ± π/4, obtain first compared with ± π/4
Secondary phase fiducial value, and according to the first phase fiducial value and the default starting point, obtain new starting point;
Step S111:According to the new starting point and the predetermined sequence length, obtained from the preliminary sequence described
The sequence positive again of electric power signal, and according to the pleat sequence anti-again of the positive sequence acquisition again electric power signal;
Step S112:The positive phase again of the electric power signal is obtained according to the sequence positive again, and according to described
Anti- pleat sequence obtains the antiphase again of the electric power signal again;
Step S113:The average again of the electric power signal is obtained according to the positive phase again and the antiphase again
Initial phase;
Step S114:Positive sequence is added with the pleat sequence anti-again again by described in, and according to the result after addition
With the initial phase that is averaged again, the cosine function modulation sequence of the electric power signal is obtained;
Step S115:The sequence positive again and the pleat sequence anti-again are subtracted each other, and according to the result after subtracting each other
With the initial phase that is averaged again, the SIN function modulation sequence of the electric power signal is obtained;
Step S116:The discrete sine function of default fine tuning frequency with the cosine function modulation sequence is multiplied and obtains institute
The first multiplication sequence of electric power signal is stated, the discrete cosine function of the default fine tuning frequency is modulated into sequence with the SIN function
Row, which are multiplied, obtains the second multiplication sequence of the electric power signal, by the discrete sine function of default fine tuning frequency and the sinusoidal letter
Number modulation sequence, which is multiplied, obtains the 3rd multiplication sequence of the electric power signal, by the discrete cosine function of the default fine tuning frequency
It is multiplied with the cosine function modulation sequence and obtains the 4th multiplication sequence of the electric power signal;
Step S117:First multiplication sequence with second multiplication sequence is added, obtains the electric power signal
Improve the frequency sine sequence of function;4th multiplication sequence with the 3rd multiplication sequence is subtracted each other, obtains the electric power letter
Number raising frequency cosine function sequence.
Step S118:Institute is obtained according to the raising frequency sine sequence of function and the raising frequency cosine function sequence
State the raising frequency orthogonal sequence of electric power signal.
It is evidenced from the above discussion that the present invention, which obtains, improves frequency orthogonal sequence, the accuracy that sine parameter calculates is improved, it is real
Border application value is high.
Wherein, the electric power signal is the sinusoidal signal based on a kind of fundamental wave component.Sinusoidal signal extensively refers to SIN function letter
Number and cosine function signal.
In one embodiment, power system frequency scope takes frequency power signal lower limit f in 45Hz-55HzminFor
45Hz;The default integer signal period number C is set according to actual needs2π, in one embodiment, take C2πFor 13.At one
In embodiment, for step S101, the preliminary sequence length is obtained as formula (1):
In formula, NstartFor preliminary sequence length;(int) rounding is represented;C2πTo preset integer signal period number;fminFor electricity
The lower limit of force signal frequency range, unit Hz;F is preset sample frequency, unit Hz.
In one embodiment, the electric power signal is the cosine function signal of single fundamental frequency, for step S102, is obtained
The preliminary sequence for obtaining the electric power signal is formula (2):
Wherein, Xstart(n) it is the preliminary sequence;A is signal amplitude, unit v;ωiFor signal frequency, T is between sampling
Every the time, f is preset sample frequency, and unit Hz, n are series of discrete number,For preliminary sequence initial phase, NstartFor preliminary sequence
Length.
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 or based on the frequency algorithm of phase difference at the beginning of the preliminary sequence into line frequency
It surveys, obtains the preliminary frequency.
In one embodiment, the preliminary frequency is generated as formula (3):
ωo(3);
Wherein, ωoFor preliminary frequency;Preferably, it is formula (4) that the reference frequency, which is equal to the preliminary frequency,:
ωs=ωo(4);
Wherein, ωsFor reference frequency, ωoFor preliminary frequency.
In one embodiment, for step S104, the unit period sequence length for obtaining the electric power signal is formula
(5):
In formula, N2πFor the unit period sequence length;(int) it is round numbers;F is preset sample frequency, unit Hz;
ωsFor reference frequency.
There are the errors in 1 sampling interval for the unit period sequence length integer.
In one embodiment, for step S105, the predetermined sequence length is obtained as formula (6):
N=(int) [(C2π-1)N2π] (6);
Wherein, N be predetermined sequence length, (int) be round numbers, N2πFor the unit period sequence length, C2πIt is default
Integer signal period number.
In one embodiment, 0.5 times that starting point is the unit period sequence length is preset;
In one embodiment, for step S106, it is formula (7) to obtain the first positive sequence:
Wherein, Xstart(n) it is preliminary sequence, X+start(n) it is first positive sequence, PstartDefault starting point, N2πFor institute
Unit period sequence length is stated, (int) is round numbers, and A is signal amplitude, unit v, ωiFor signal frequency, T is the sampling interval
Time, n are series of discrete number,For first positive sequence initial phase, N predetermined sequence length.First forward direction sequence pattern table
It reaches, shown in Fig. 2.
In one embodiment, for step S107, it is formula (8) to obtain first anti-pleat sequence:
Wherein, X-start(- n) is first anti-pleat sequence, X+start(n) it is 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 first anti-pleat sequence initial phase, and N presets sequence
Row length.The avatars of the first anti-pleat sequence, as shown in Figure 2.
In one embodiment, first positive phase and first antiphase be based on it is orthogonal mixing and integral and calculating as a result,
When without considering the mixing interfering frequency of orthogonal mixing, orthogonal mixing is expressed as formula (9), and integral and calculating is expressed as formula (10):
Wherein, R+start(n) it is first positive real frequency mixing sequence, I+start(n) sequence, R are mixed for first weakened body resistance frequency-start
(- n) is that first anti-real frequency is mixed sequence, I-start(- n) is that 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) discrete sine function of reference frequency, Ω is
Signal frequency ωiWith reference frequency ωsFrequency difference, ωiFor signal frequency, T is sampling interval duration, and n is series of discrete number,
For first positive sequence initial phase, β 1 is first positive sequence initial phase, and N is predetermined sequence length.
In formula, R+startFirst positive real frequency integrated value, unit dimensionless, I+startFor first weakened body resistance frequency integrated value, unit without
Dimension, R-startFor first anti-real frequency integrated value, unit dimensionless, I-startIt is immeasurable for 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 first positive sequence initial phase, β 1 is first anti-pleat sequence initial phase.
In one embodiment, for step S108, the expression formula for obtaining first positive phase and first antiphase is (11):
In formula, PH+startFor first positive phase, PH-startFor first antiphase, R+startFirst positive real frequency integrated value, unit
Dimensionless, I+startFor first weakened body resistance frequency integrated value, unit dimensionless, R-startFor first anti-real frequency integrated value, unit dimensionless,
I-startFor first anti-empty frequency mixing integrated value, unit dimensionless, Ω is signal frequency ωiWith reference frequency ωsFrequency difference, T is
Sampling interval duration, N are predetermined sequence length,For first positive sequence initial phase, β 1 is first positive sequence initial phase.
In one embodiment, for step S109, the expression formula for obtaining first averagely initial phase is (12):
In formula, PHstart-avgFor the initial phase that is averaged for the first time, PH+startFor first positive phase, PH-startFor first antiphase,For first positive sequence initial phase, β 1 is first anti-pleat sequence initial phase.
In one embodiment, for step S110, by initial phase and the PH of being averaged for the first timestart-avgIt is carried out with ± π/4
Compare for formula (13):
In formula, Δ PHcomFor first phase fiducial value, unit rad, PHstart-avgFor the initial phase that is averaged for the first time.
In one embodiment, it is formula (14) to obtain the new starting point:
In formula, PnewFor new starting point, unit dimensionless, PstartTo preset starting point, Δ PHcomFor first phase bit comparison
Value, unit rad, N2πFor unit periodic sequence length, (int) is round numbers.
In one embodiment, for step S111, positive sequence and anti-pleat sequence is formula (15) again again:
In formula, X+end(n) it is positive sequence again, X-end(- n) is anti-pleat sequence again, PnewFor new starting point, unit without
Dimension,For positive sequence initial phase again, β 2 is anti-pleat sequence initial phase again, ωiFor signal frequency, T is the sampling interval
Time, n are series of discrete number, and N is predetermined sequence length.
In one embodiment, again positive phase and again antiphase be based on it is orthogonal mixing and digital filtering calculate knot
Fruit.The digital filtering is made of 6 grades of rectangular window arithmetic mean filters of 2 kinds of filtering parameters.
When without considering the mixing interfering frequency of orthogonal mixing, orthogonal mixing is expressed as formula (16), and the 6 of 2 kinds of filtering parameters
Grade rectangular window arithmetic mean filter filtering calculation expression is formula (17):
In formula, R+end(n) it is positive real frequency mixing sequence again, I+end(n) sequence, R are mixed for weakened body resistance frequency again-end(-n)
For anti-real frequency mixing sequence again, I-end(- n) is mixed sequence, cos (ω for anti-empty frequency againsTn)cos(ωsTn) or cos (-
ωsTn it is) the discrete cosine function of reference frequency, sin (ωs) or sin (- ω TnsTn it is) the discrete sine letter of reference frequency
Number, Ω are signal frequency ωiWith reference frequency ωsFrequency difference, ωiFor signal frequency, T is sampling interval duration, n for sequence from
Dissipate number,For positive sequence initial phase again, β 2 is anti-pleat sequence initial phase again, and N is predetermined sequence length.
In formula, R+endFor positive real frequency digital filtering final value again, unit dimensionless;I+endFor weakened body resistance frequency digital filtering again
Final value, unit dimensionless;R-endFor anti-digital filtering final value again, unit dimensionless;I-endIt is whole for anti-empty frequency digital filtering again
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 positive sequence initial phase again;β 2 is anti-pleat sequence first phase again
Position;ND1For filtering parameter 1, i.e., to ND1A 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 ND2A 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 inhibition to the mixing interfering frequency that 1/3 subharmonic generates;Filtering parameter ND2Value is the reference frequency
2 times of unit period sequence length, purpose carries out depth to the mixing interfering frequency of the generations such as direct current, 1/2 gradation, subharmonic
Inhibit.6 grades of rectangular window arithmetic mean filters filtering of 2 kinds of filtering parameters, which calculates, to be needed using signal period sequence length
10.5 times.
Filtering parameter ND1With filtering parameter ND2Expression formula is formula (18):
In formula, ND1For digital filter parameters 1, unit dimensionless, (int) is round numbers, ND2It is single for digital filter parameters 2
Position dimensionless, N2πFor unit periodic sequence length.
In one embodiment, for step S112, positive phase and antiphase expression formula is (19) again again:
In formula, PH+endFor positive phase again, PH-endFor antiphase again, R+endFor positive real frequency integrated value again, unit without
Dimension, I+endFor weakened body resistance frequency integrated value again, unit dimensionless, R-endFor anti-real frequency integrated value again, unit dimensionless, I-end
For anti-empty frequency mixing integrated value again, 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 positive sequence initial phase again, β 2 is anti-pleat sequence first phase again
Position.
In one embodiment, for step S113, the expression formula for obtaining the initial phase that is averaged again is (20):
In formula, PHend-avgFor the initial phase that is averaged again, PH+endFor positive phase again, PH-endFor antiphase again,For
Positive sequence initial phase again, β 2 are anti-pleat sequence initial phase again.
In one embodiment, for step S114, it is (21) to obtain cosine function modulation sequence expression formula:
In formula, Xcos(n) it is cosine function modulation sequence;A be 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 are predetermined sequence length,For positive sequence initial phase again, β 2 is anti-pleat sequence initial phase again.
In one embodiment, for step S115, it is (22) to obtain SIN function modulation sequence expression formula:
In formula, Xsin(n) it is SIN function modulation sequence, A is SIN 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 are predetermined sequence length,For positive sequence initial phase again, β 2 is anti-pleat sequence initial phase again.
In one embodiment, the default frequency of finely tuning is the arithmetic number less than or equal to actual signal frequency 1%, unit
Rad/s is expressed as formula (23):
In formula, ΩsetTo finely tune frequency, unit rad/s, Ωset≤0.01ωi。
For step S116, the discrete sine function of the fine tuning frequency with the cosine function modulation sequence is multiplied and is obtained
It is formula (24) to obtain the first multiplication sequence:
For step S116, the discrete cosine function of the fine tuning frequency with the SIN function modulation sequence is multiplied and is obtained
It is formula (25) to obtain the second multiplication sequence:
For step S116, the discrete sine function of default fine tuning frequency with the SIN function modulation sequence is multiplied and is obtained
The 3rd multiplication sequence for obtaining the electric power signal is formula (26):
For step S116, by the discrete cosine function of the default fine tuning frequency and the cosine function modulation sequence phase
Multiply and obtain the 4th multiplication sequence of the electric power signal as formula (27):
In formula, X1 (n) be the first multiplication sequence, X2 (n) be the second multiplication sequence, X3 (n) be the first multiplication sequence, X4
(n) it is the second multiplication sequence, sin (ΩsetTn it is) discrete sine function of the fine tuning frequency, cos (ΩsetTn) to be described micro-
The discrete cosine function of frequency modulation rate.
In one embodiment, for step S117, it is formula (28) to obtain and improve the frequency sine sequence of function:
In one embodiment, for step S117, it is formula (29) to obtain and improve frequency cosine function sequence:
In formula, Xsin+f(n) it is the raising frequency sine sequence of function, Xcos+f(n) it is raising frequency cosine function sequence, sequence
Row frequency improves Ωset。
In one embodiment, for step S118, it is formula (30) to obtain and improve frequency orthogonal sequence:
In formula, sequence Xsin+f(n) and sequence Xcos+f(n) it is orthogonal each other.
The system that the raising frequency orthogonal sequence of electric power signal is obtained in one embodiment, as shown in figure 3, including:
Preliminary sequence length modules 301, for lower limit, the preset sample frequency and default according to frequency power signal scope
Integer signal period number obtains the preliminary sequence length of the electric power signal;
Preliminary sequence module 302 for being sampled according to the preliminary sequence length to the electric power signal, obtains institute
State the preliminary sequence of electric power signal;
Frequency preliminary survey module 303, for, into line frequency preliminary survey, generating the preliminary of the electric power signal to the preliminary sequence
Frequency, and according to the reference frequency of the preliminary frequency setting electric power signal;
Unit period sequence length module 304, for according to the preset sample frequency and the reference frequency, obtaining institute
State the unit period sequence length of electric power signal;
Predetermined sequence length modules 305, for according to the default integer signal period number and the unit period sequence
Length obtains the predetermined sequence length of the electric power signal;
First forward direction block 306, for the default starting point of basis and the predetermined sequence length, from the preliminary sequence
The first positive sequence of the electric power signal is obtained in row;
First anti-pleat block 307, for obtaining the first anti-of the electric power signal according to the first positive sequence
Pleat sequence;
First phase module 308, for obtaining the first positive phase of the electric power signal according to the first positive sequence,
And the first antiphase of the electric power signal is obtained according to the first anti-pleat sequence;
Be averaged initial phase module 309 for the first time, described in being obtained according to the first positive phase and the first antiphase
The initial phase that is averaged for the first time of electric power signal;
Phase bits comparison module 310, for by it is described for the first time averagely initial phase with ± π/4 compared with, obtain and it is described ±
The first phase fiducial value that π/4 are compared, and according to the first phase fiducial value and the default starting point, obtain new starting
Point;
Block 311 again, for according to the new starting point and the predetermined sequence length, from the preliminary sequence
The middle sequence positive again for obtaining the electric power signal, and the electric power signal is obtained again according to the sequence positive again
Anti- pleat sequence;
Phase module 312 again, for positive sequence to obtain the positive phase again of the electric power signal again according to,
And the antiphase again of the electric power signal is obtained according to the pleat sequence anti-again;
Be averaged initial phase module 313 again, described in positive phase and the antiphase again obtain again according to
The initial phase that is averaged again of electric power signal;
Cosine function modulation sequence module 314, for positive sequence to be added with the pleat sequence anti-again again by described in,
And according to the result after addition and the initial phase that is averaged again, obtain the cosine function modulation sequence of the electric power signal;
SIN function modulation sequence module 315, for the sequence positive again and the pleat sequence anti-again to be subtracted each other,
And according to the result after subtracting each other and the initial phase that is averaged again, the SIN function modulation sequence of the electric power signal is obtained;
Multiplication sequence module 316, for the discrete sine function of default fine tuning frequency to be modulated sequence with the cosine function
Row, which are multiplied, obtains the first multiplication sequence of the electric power signal, by the discrete cosine function of the default fine tuning frequency with it is described just
String FUNCTION MODULATION sequence, which is multiplied, obtains the second multiplication sequence of the electric power signal, by the discrete sine function of default fine tuning frequency
It is multiplied with the SIN function modulation sequence and obtains the 3rd multiplication sequence of the electric power signal, by the default fine tuning frequency
Discrete cosine function is multiplied with the cosine function modulation sequence obtains the 4th multiplication sequence of the electric power signal;
Frequency function block 317 is improved, for first multiplication sequence to be added with second multiplication sequence,
Obtain the raising frequency sine sequence of function of the electric power signal;By the 4th multiplication sequence and the 3rd multiplication sequence phase
Subtract, obtain the raising frequency cosine function sequence of the electric power signal.
Frequency orthogonal block 318 is improved, for according to the raising frequency sine sequence of function and the raising frequency
Rate cosine function sequence obtains the raising frequency orthogonal sequence of the electric power signal.
It is evidenced from the above discussion that the present invention, which obtains, improves frequency orthogonal sequence, the accuracy that sine parameter calculates is improved, it is full
Foot actual needs.
Wherein, the electric power signal is the sinusoidal signal based on a kind of fundamental wave component.Sinusoidal signal extensively refers to SIN function letter
Number and cosine function signal.In one embodiment, power system frequency scope is taken under frequency power signal in 45Hz-55Hz
Limit fminFor 45Hz;The default integer signal period number C is set according to actual needs2π, in one embodiment, take C2πFor
13。
In one embodiment, preliminary sequence length modules 301 obtain the preliminary sequence length as formula (1):
In formula, NstartFor preliminary sequence length;(int) rounding is represented;C2πTo preset integer signal period number;fminFor electricity
The lower limit of force signal frequency range, unit Hz;F is preset sample frequency, unit Hz.
In one embodiment, the electric power signal is the cosine function signal of single fundamental frequency, preliminary sequence module 302
The preliminary sequence for obtaining the electric power signal is formula (2):
Wherein, Xstart(n) it is the preliminary sequence;A is signal amplitude, unit v;ωiFor signal frequency, T is between sampling
Every the time, f is preset sample frequency, and unit Hz, n are series of discrete number,For preliminary sequence initial phase, NstartFor preliminary sequence
Length.
Frequency preliminary survey module 303 can by zero hand over method, the algorithm based on filtering, based on Wavelet Transformation Algorithm, based on nerve
The algorithm of network, the frequency algorithm based on DFT transform or based on the frequency algorithm of phase difference to the preliminary sequence into line frequency
Preliminary survey obtains the preliminary frequency.
In one embodiment, the preliminary frequency is generated as formula (3):
ωo(3);
Wherein, ωoFor preliminary frequency;Preferably, it is formula (4) that the reference frequency, which is equal to the preliminary frequency,:
ωs=ωo(4);
Wherein, ωsFor reference frequency, ωoFor preliminary frequency.
In one embodiment, unit period sequence length module 304 obtains the unit period sequence of the electric power signal
Length is formula (5):
In formula, N2πFor the unit period sequence length;(int) it is round numbers;F is preset sample frequency, unit Hz;
ωsFor reference frequency.There are the errors in 1 sampling interval for unit period sequence length integer.
In one embodiment, it is formula (6) that predetermined sequence length modules 305, which obtain predetermined sequence length,:
N=(int) [(C2π-1)N2π] (6);
Wherein, N be predetermined sequence length, (int) be round numbers, N2πFor the unit period sequence length, C2πIt is default
Integer signal period number.
In one embodiment, 0.5 times that starting point is the unit period sequence length is preset;First forward direction sequence mould
It is formula (7) that block 306, which obtains the first positive sequence,:
Wherein, Xstart(n) it is preliminary sequence, X+start(n) it is first positive sequence, PstartDefault starting point, N2πFor institute
Unit period sequence length is stated, (int) is round numbers, and A is signal amplitude, unit v, ωiFor signal frequency, T is the sampling interval
Time, n are series of discrete number,For first positive sequence initial phase, N predetermined sequence length.First forward direction sequence pattern table
It reaches, shown in Fig. 2.
In one embodiment, it is formula (8) that first anti-pleat block 307, which obtains first anti-pleat sequence,:
Wherein, X-start(- n) is first anti-pleat sequence, X+start(n) it is 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 first anti-pleat sequence initial phase, and N presets sequence
Row length.The avatars of the first anti-pleat sequence, as shown in Figure 2.
First positive phase and first antiphase are as a result, without considering orthogonal mixing based on orthogonal mixing and integral and calculating
Mixing interfering frequency when, orthogonal mixing is expressed as formula (9), and integral and calculating is expressed as formula (10):
Wherein, R+start(n) it is first positive real frequency mixing sequence, I+start(n) sequence, R are mixed for first weakened body resistance frequency-start
(- n) is that first anti-real frequency is mixed sequence, I-start(- n) is that 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) discrete sine function of reference frequency, Ω is
Signal frequency ωiWith reference frequency ωsFrequency difference, ωiFor signal frequency, T is sampling interval duration, and n is series of discrete number,
For first positive sequence initial phase, β 1 is first positive sequence initial phase, and N is predetermined sequence length.
In formula, R+startFirst positive real frequency integrated value, unit dimensionless, I+startFor first weakened body resistance frequency integrated value, unit without
Dimension, R-startFor first anti-real frequency integrated value, unit dimensionless, I-startIt is immeasurable for 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 first positive sequence initial phase, β 1 is first anti-pleat sequence initial phase.
In one embodiment, first phase module 308 obtains first positive phase and first antiphase is (11):
In formula, PH+startFor first positive phase, PH-startFor first antiphase, R+startFirst positive real frequency integrated value, unit
Dimensionless, I+startFor first weakened body resistance frequency integrated value, unit dimensionless, R-startFor first anti-real frequency integrated value, unit dimensionless,
I-startFor first anti-empty frequency mixing integrated value, unit dimensionless, Ω is signal frequency ωiWith reference frequency ωsFrequency difference, T is
Sampling interval duration, N are predetermined sequence length,For first positive sequence initial phase, β 1 is first positive sequence initial phase.
In one embodiment, it is (12) that averagely initial phase module 309, which obtains for the first time averagely initial phase, for the first time:
In formula, PHstart-avgFor the initial phase that is averaged for the first time, PH+startFor first positive phase, PH-startFor first antiphase,For first positive sequence initial phase, β 1 is first anti-pleat sequence initial phase.
In one embodiment, phase bits comparison module 310 by it is described for the first time averagely initial phase and PHstart-avgWith ± π/4 into
Row is relatively formula (13):
In formula, Δ PHcomFor first phase fiducial value, unit rad, PHstart-avgFor the initial phase that is averaged for the first time.
In one embodiment, it is formula (14) to obtain the new starting point:
In formula, PnewFor new starting point, unit dimensionless, PstartTo preset starting point, Δ PHcomFor first phase bit comparison
Value, unit rad, N2πFor unit periodic sequence length, (int) is round numbers.
In one embodiment, block 311 obtains positive sequence again again and anti-pleat sequence is formula (15) again:
In formula, X+end(n) it is positive sequence again, X-end(- n) is anti-pleat sequence again, PnewFor new starting point, unit without
Dimension,For positive sequence initial phase again, β 2 is anti-pleat sequence initial phase again, ωiFor signal frequency, T is the sampling interval
Time, n are series of discrete number, and N is predetermined sequence length.
In one embodiment, again positive phase and again antiphase be based on it is orthogonal mixing and digital filtering calculate knot
Fruit.The digital filtering is made of 6 grades of rectangular window arithmetic mean filters of 2 kinds of filtering parameters.
When without considering the mixing interfering frequency of orthogonal mixing, orthogonal mixing is expressed as formula (16), and the 6 of 2 kinds of filtering parameters
Grade rectangular window arithmetic mean filter filtering calculation expression is formula (17):
In formula, R+end(n) it is positive real frequency mixing sequence again, I+end(n) sequence, R are mixed for weakened body resistance frequency again-end(-n)
For anti-real frequency mixing sequence again, I-end(- n) is mixed sequence, cos (ω for anti-empty frequency agains) 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.
In formula, R+endFor positive real frequency digital filtering final value again, unit dimensionless;I+endFor weakened body resistance frequency digital filtering again
Final value, unit dimensionless;R-endFor anti-digital filtering final value again, unit dimensionless;I-endIt is whole for anti-empty frequency digital filtering again
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 positive sequence initial phase again;β 2 is anti-pleat sequence first phase again
Position;ND1For filtering parameter 1, i.e., to ND1A 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 ND2A 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 inhibition to the mixing interfering frequency that 1/3 subharmonic generates;Filtering parameter ND2Value is the reference frequency
2 times of unit period sequence length, purpose carries out depth to the mixing interfering frequency of the generations such as direct current, 1/2 gradation, subharmonic
Inhibit.6 grades of rectangular window arithmetic mean filters filtering of 2 kinds of filtering parameters, which calculates, to be needed using signal period sequence length
10.5 times.
Filtering parameter ND1With filtering parameter ND2Expression formula is formula (18):
In formula, ND1For digital filter parameters 1, unit dimensionless, (int) is round numbers, ND2It is single for digital filter parameters 2
Position dimensionless, N2πFor unit periodic sequence length.
In one embodiment, phase module 312 obtains positive phase again again and antiphase expression formula is (19) again:
In formula, PH+endFor positive phase again, PH-endFor antiphase again, R+endFor positive real frequency integrated value again, unit without
Dimension, I+endFor weakened body resistance frequency integrated value again, unit dimensionless, R-endFor anti-real frequency integrated value again, unit dimensionless, I-end
For anti-empty frequency mixing integrated value again, 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 positive sequence initial phase again, β 2 is anti-pleat sequence first phase again
Position.
In one embodiment, it is (20) that averagely initial phase module 313, which obtains the initial phase that is averaged again, again:
In formula, PHend-avgFor the initial phase that is averaged again, PH+endFor positive phase again, PH-endFor antiphase again,For
Positive sequence initial phase again, β 2 are anti-pleat sequence initial phase again.
In one embodiment, the acquisition of cosine function modulation sequence module 314 cosine function modulation sequence expression formula is
(21):
In formula, Xcos(n) it is cosine function modulation sequence;A be 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 are predetermined sequence length,For positive sequence initial phase again, β 2 is anti-pleat sequence initial phase again.
In one embodiment, the acquisition of SIN function modulation sequence module 315 SIN function modulation sequence expression formula is
(22):
In formula, Xsin(n) it is SIN function modulation sequence, A is SIN 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 are predetermined sequence length,For positive sequence initial phase again, β 2 is anti-pleat sequence initial phase again.
In one embodiment, the default frequency of finely tuning is the arithmetic number less than or equal to actual signal frequency 1%, unit
Rad/s is expressed as formula (23):
In formula, ΩsetTo finely tune frequency, unit rad/s, Ωset≤0.01ωi。
The discrete sine function of the fine tuning frequency is multiplied by multiplication sequence module 316 with the cosine function modulation sequence
The first multiplication sequence is obtained as formula (24):
The discrete cosine function of the fine tuning frequency is multiplied by multiplication sequence module 316 with the SIN function modulation sequence
The second multiplication sequence is obtained as formula (25):
The discrete sine function of default fine tuning frequency is multiplied by multiplication sequence module 316 with the SIN function modulation sequence
The 3rd multiplication sequence for obtaining the electric power signal is formula (26):
Multiplication sequence module 316 is by discrete cosine function and the cosine function modulation sequence of the default fine tuning frequency
It is multiplied and obtains the 4th multiplication sequence of the electric power signal as formula (27):
In formula, X1 (n) be the first multiplication sequence, X2 (n) be the second multiplication sequence, X3 (n) be the first multiplication sequence, X4
(n) it is the second multiplication sequence, sin (ΩsetTn it is) discrete sine function of the fine tuning frequency, cos (ΩsetTn) to be described micro-
The discrete cosine function of frequency modulation rate.
In one embodiment, it is formula to improve frequency function block 317 and obtain the raising frequency sine sequence of function
(28):
In one embodiment, it is formula to improve frequency function block 317 and obtain raising frequency cosine function sequence
(29):
In formula, Xsin+f(n) it is the raising frequency sine sequence of function, Xcos+f(n) it is raising frequency cosine function sequence, sequence
Row frequency improves Ωset。
In one embodiment, it is formula (30) to improve frequency orthogonal block 318 and obtain raising frequency orthogonal sequence:
In formula, sequence Xsin+f(n) and sequence Xcos+f(n) it is orthogonal each other.
Each technical characteristic of embodiment described above can be combined arbitrarily, to make description succinct, not to above-mentioned reality
It applies 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 description is more specific and detailed, but simultaneously
It cannot therefore be construed as limiting the scope of the patent.It should be pointed out that come for those of ordinary skill in the art
It says, 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 (6)
- A kind of 1. method for the raising frequency orthogonal sequence for obtaining electric power signal, which is characterized in that comprise the following steps:According to the lower limit of frequency power signal scope, preset sample frequency and default integer signal period number, the electric power is obtained The preliminary sequence length of signal;The electric power signal is sampled according to the preliminary sequence length, obtains the preliminary sequence of the electric power signal;To the preliminary sequence into line frequency preliminary survey, the preliminary frequency of the electric power signal is generated, and according to the preliminary frequency Set the reference frequency of the electric power signal;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, the default sequence of the electric power signal is obtained Row length;According to default starting point and the predetermined sequence length, obtained from the preliminary sequence electric power signal it is first just To sequence;The first anti-pleat sequence of the electric power signal is obtained according to the first positive sequence;The first positive phase of the electric power signal is obtained according to the first positive sequence, and is obtained according to the first anti-pleat sequence Obtain the first antiphase of the electric power signal;The initial phase that is averaged for the first time of the electric power signal is obtained according to the first positive phase and the first antiphase;By the averagely initial phase for the first time compared with ± π/4, the first phase fiducial value compared with ± π/4 is obtained, And according to the first phase fiducial value and the default starting point, obtain new starting point;According to the new starting point and the predetermined sequence length, the electric power signal is obtained from the preliminary sequence again Positive sequence, and according to the pleat sequence anti-again of the positive sequence acquisition again electric power signal;The positive phase again of the electric power signal is obtained according to the sequence positive again, and is obtained according to the pleat sequence anti-again Obtain the antiphase again of the electric power signal;The initial phase that is averaged again of the electric power signal is obtained according to the positive phase again and the antiphase again;The sequence positive again with the pleat sequence anti-is again added, and described is averaged according to the result after addition and again Initial phase obtains the cosine function modulation sequence of the electric power signal;It is described to be added the sequence of forward direction again with the pleat sequence anti-again, and according to the result after addition and it is described again Average initial phase, obtaining the cosine function modulation sequence of the electric power signal includes:According to expression formulaObtain the cosine function modulation sequence Xcos(n), wherein n=0, 1,2 ..., N-1, X+end (n) are the sequence positive again, X-end(- n) pleat sequence anti-again, PH for described inend-avgTo be described Be averaged initial phase again, and n is series of discrete number, and N is the predetermined sequence length;The sequence positive again and the pleat sequence anti-again are subtracted each other, and according to the result after subtracting each other and described average again Initial phase obtains the SIN function modulation sequence of the electric power signal;It is described to subtract each other the sequence positive again and the pleat sequence anti-again, and according to the result after subtracting each other and it is described again Average initial phase, obtaining the SIN function modulation sequence of the electric power signal includes:According to expression formulaObtain the SIN function modulation sequence Xsin(n), wherein n=0,1, 2 ..., N-1, X+end(n) it is the sequence positive again, X-end(- n) pleat sequence anti-again, PH for described inend-avgFor it is described again Secondary average initial phase, n are series of discrete number, and N is the predetermined sequence length;The discrete sine function of default fine tuning frequency with the cosine function modulation sequence is multiplied and obtains the electric power signal The discrete cosine function of the default fine tuning frequency with the SIN function modulation sequence is multiplied and obtains institute by the first multiplication sequence The second multiplication sequence of electric power signal is stated, by the discrete sine function of default fine tuning frequency and the SIN function modulation sequence phase Multiply the 3rd multiplication sequence for obtaining the electric power signal, by the discrete cosine function of the default fine tuning frequency and the cosine letter Number modulation sequence, which is multiplied, obtains the 4th multiplication sequence of the electric power signal;First multiplication sequence with second multiplication sequence is added, obtains the raising frequency sine letter of the electric power signal Number Sequence;4th multiplication sequence is subtracted each other with the 3rd multiplication sequence, more than the raising frequency for obtaining the electric power signal The string sequence of function;The electric power signal is obtained according to the raising frequency sine sequence of function and the frequency cosine function sequence that improves Improve frequency orthogonal sequence.
- 2. the method for the raising frequency orthogonal sequence according to claim 1 for obtaining electric power signal, which is characterized in that described Electric power signal is the cosine function signal of single fundamental frequency, according to expression formulaIt obtains described first Step sequence Xstart(n), whereinN=0,1,2,3 ..., Nstart- 1, A are signal amplitude, ωiFor signal frequency,For The initial phase of the preliminary sequence, T are sampling interval duration, and f is the preset sample frequency, and n is series of discrete number, NstartFor The preliminary sequence length.
- 3. the method for the raising frequency orthogonal sequence according to claim 1 for obtaining electric power signal, which is characterized in that according to Expression formula X1 (n)=Xcos(n)sin(ΩsetTn the first multiplication sequence X1 (n)) is obtained, according to expression formula X2 (n)=Xsin (n)cos(ΩsetTn the second multiplication sequence X2 (n)) is obtained, according to expression formula X3 (n)=Xsin(n)sin(ΩsetTn) obtain The 3rd multiplication sequence X3 (n) is obtained, according to expression formula X4 (n)=Xcos(n)cos(ΩsetTn the 4th multiplication sequence) is obtained Arrange X4 (n), wherein n=0,1,2 ..., N-1, Xcos(n) it is the cosine function modulation sequence, Xsin(n) it is the sinusoidal letter Number modulation sequence, sin (ΩsetTn it is) discrete sine function of the default fine tuning frequency, cos (ΩsetTn) to be described default Finely tune the discrete cosine function of frequency, ΩsetFor the default fine tuning frequency, T is sampling interval duration, and n is series of discrete number, N For the predetermined sequence length.
- 4. a kind of system for the raising frequency orthogonal sequence for obtaining electric power signal, which is characterized in that including:Preliminary sequence length modules, for lower limit, preset sample frequency and the default integer letter according to frequency power signal scope Number periodicity obtains the preliminary sequence length of the electric power signal;Preliminary sequence module for being sampled according to the preliminary sequence length to the electric power signal, obtains the electric power The preliminary sequence of signal;Frequency preliminary survey module, for into line frequency preliminary survey, generating the preliminary frequency of the electric power signal to the preliminary sequence, and The reference frequency of the electric power signal is set according to the preliminary frequency;Unit period sequence length module, for according to the preset sample frequency and the reference frequency, obtaining the electric power The unit period sequence length of signal;Predetermined sequence length modules, for according to the default integer signal period number and the unit period sequence length, obtaining Obtain the predetermined sequence length of the electric power signal;First forward direction block, for according to default starting point and the predetermined sequence length, being obtained from the preliminary sequence Obtain the first positive sequence of the electric power signal;First anti-pleat block, for obtaining the first anti-pleat sequence of the electric power signal according to the first positive sequence;First phase module, for the first positive phase according to the first positive sequence acquisition electric power signal, and according to The first anti-pleat sequence obtains the first antiphase of the electric power signal;Be averaged initial phase module for the first time, for obtaining the electric power signal according to the first positive phase and the first antiphase For the first time averagely initial phase;Phase bits comparison module, for compared with ± π/4, obtaining the averagely initial phase for the first time compared with ± π/4 First phase fiducial value, and according to the first phase fiducial value and the default starting point, obtain new starting point;Block again, for according to the new starting point and the predetermined sequence length, being obtained from the preliminary sequence The sequence positive again of the electric power signal, and according to the pleat sequence anti-again of the positive sequence acquisition again electric power signal Row;Phase module again, for the positive phase again according to the positive sequence acquisition again electric power signal, and according to The pleat sequence anti-again obtains the antiphase again of the electric power signal;Be averaged initial phase module again, for positive phase and the antiphase again to obtain the electric power signal again according to Again be averaged initial phase;Cosine function modulation sequence module, for positive sequence to be added with the pleat sequence anti-again again by described in, and according to Result and the initial phase that is averaged again after addition obtain the cosine function modulation sequence of the electric power signal;It is described to be added the sequence of forward direction again with the pleat sequence anti-again, and according to the result after addition and it is described again Average initial phase, obtaining the cosine function modulation sequence of the electric power signal includes:According to expression formulaObtain the cosine function modulation sequence Xcos(n), wherein n=0, 1,2 ..., N-1, X+end(n) it is the sequence positive again, X-end(- n) pleat sequence anti-again, PH for described inend-avgTo be described Be averaged initial phase again, and n is series of discrete number, and N is the predetermined sequence length;SIN function modulation sequence module, for the sequence positive again and the pleat sequence anti-again to be subtracted each other, and according to Result and the initial phase that is averaged again after subtracting each other obtain the SIN function modulation sequence of the electric power signal;It is described to subtract each other the sequence positive again and the pleat sequence anti-again, and according to the result after subtracting each other and it is described again Average initial phase, obtaining the SIN function modulation sequence of the electric power signal includes:According to expression formulaObtain the SIN function modulation sequence Xsin(n), wherein n=0,1, 2 ..., N-1, X+end(n) it is the sequence positive again, X-end(- n) pleat sequence anti-again, PH for described inend-avgFor it is described again Secondary average initial phase, n are series of discrete number, and N is the predetermined sequence length;Multiplication sequence module obtains for the discrete sine function of default fine tuning frequency to be multiplied with the cosine function modulation sequence The first multiplication sequence of the electric power signal is obtained, by the discrete cosine function of the default fine tuning frequency and the SIN function tune Sequence processed, which is multiplied, obtains the second multiplication sequence of the electric power signal, by the discrete sine function of default fine tuning frequency with it is described just String FUNCTION MODULATION sequence, which is multiplied, obtains the 3rd multiplication sequence of the electric power signal, by the discrete cosine of the default fine tuning frequency Function is multiplied with the cosine function modulation sequence obtains the 4th multiplication sequence of the electric power signal;Frequency function block is improved, for first multiplication sequence to be added with second multiplication sequence, obtains institute State the raising frequency sine sequence of function of electric power signal;4th multiplication sequence with the 3rd multiplication sequence is subtracted each other, is obtained Obtain the raising frequency cosine function sequence of the electric power signal;Frequency orthogonal block is improved, for according to the raising frequency sine sequence of function and the raising frequency cosine letter Number Sequence obtains the raising frequency orthogonal sequence of the electric power signal.
- 5. the system of the raising frequency orthogonal sequence according to claim 4 for obtaining electric power signal, which is characterized in that described Electric power signal is the cosine function signal of single fundamental frequency, and the preliminary sequence module is according to expression formulaObtain the preliminary sequence Xstart(n), whereinN=0,1,2,3 ..., Nstart- 1, A is signal amplitude, ωiFor signal frequency,For the initial phase of the preliminary sequence, T is sampling interval duration, and f is described pre- If sample frequency, n be series of discrete number, NstartFor the preliminary sequence length.
- 6. the system of the raising frequency orthogonal sequence according to claim 4 for obtaining electric power signal, which is characterized in that described Multiplication sequence module is according to expression formula X1 (n)=Xcos(n)sin(ΩsetTn the first multiplication sequence X1 (n)) is obtained, according to Expression formula X2 (n)=Xsin(n)cos(ΩsetTn the second multiplication sequence X2 (n)) is obtained, according to expression formula X3 (n)=Xsin (n)sin(ΩsetTn the 3rd multiplication sequence X3 (n)) is obtained, according to expression formula X4 (n)=Xcos(n)cos(ΩsetTn) obtain Obtain the 4th multiplication sequence X4 (n), wherein n=0,1,2 ..., N-1, Xcos(n) it is the cosine function modulation sequence, Xsin (n) it is the SIN function modulation sequence, sin (ΩsetTn it is) discrete sine function of the default fine tuning frequency, cos (ΩsetTn it is) the discrete cosine function of the default fine tuning frequency, ΩsetFor the default fine tuning frequency, when T is the sampling interval Between, n is series of discrete number, and N is the predetermined sequence length.
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