CN107831365A - A kind of open loop synchronous method based on moving average filter to power network phase-angle detection - Google Patents
A kind of open loop synchronous method based on moving average filter to power network phase-angle detection Download PDFInfo
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Abstract
The present invention provides a kind of open loop synchronous method based on moving average filter to power network phase-angle detection, including：The three-phase voltage of power network is obtained, Clark conversion is carried out to the three-phase voltage and Park converts to obtain first voltage signal and second voltage signal；The interference volume in the first voltage signal and second voltage signal is filtered out using moving average filter, obtains tertiary voltage signal and the 4th voltage signal；According to the tertiary voltage signal and the 4th voltage signal, power network phase angle is detected.Method provided by the invention, based on dq axles, and the open loop simultaneous techniques of only one Park conversion module phase detecting part need not increase it is any feedback there is the characteristics of absolute stability and fast response time, the antijamming capability of this method, can provide higher synchronization accuracy under undesirable grid conditions when the MAF structures of series connection improve mains frequency fluctuation simultaneously.
Description
Technical field
The present invention relates to synchronized technical field, more particularly, to one kind based on moving average filter to power network
The open loop synchronous method of phase-angle detection.
Background technology
The consumption of traditional energy and its environmental problem moment brought affect the survival and development of the mankind, and are future
Alarm bell has been beaten in human development.At present, the whole world has begun to actively solve this problem：Active development and application wind energy, too
The regenerative resources such as positive energy, geothermal energy, water energy, tide energy.Regenerative resource is due to the spy of its aboundresources and cleanliness without any pollution
Property, receive global concern and attention.For improve renewable and clean energy resource utilization rate, need in actual applications by
Renewable energy system is carried out grid-connected with power system by power converter.Power converter rely on supply voltage with
Line voltage is consistent, but to realize this point it may first have to and detection obtains the frequency, phase, amplitude of line voltage,
Power converter is controlled with this, the voltage and line voltage for making renewable energy system is consistent.
In current research, it has been suggested that multiple synchronization technology, these simultaneous techniques can be roughly divided into two classes：Closed loop
Simultaneous techniques (close-loop synchronization, CLS) and open loop simultaneous techniques (open-loop
Synchronization, OLS).In the prior art, closed based on phaselocked loop (phase-locked loop, PLL) algorithm
Ring simultaneous techniques it is most widely used.Phaselocked loop have it is simple, accurately and quickly the characteristics of, therefore obtained extensive and big
The application of amount.Phaselocked loop is a negative feed back control system, forms closed loop, makes the voltage amplitude of output signal and input signal
Value, phase, frequency are all consistent, so as to reach the purpose for monitoring line voltage constantly.However, the design of phaselocked loop needs
Precision and response speed are taken into account, and to ensure that phase-locked loop structures are stable, the analysis of stability and the optimization of parameter are also necessary
's.
The major defect of closed-loop synchronization technology based on phaselocked loop is to need according to its stability of its transfer function analysis,
And need to come while meet antijamming capability and response speed from appropriate parameter.The conversion of phase-locked loop structures, wave filter
Change may all cause the change of transmission function, this cause the selection of parameter and the analysis of stability need to follow its change and
Re-start, greatly increase complexity.On the other hand, the most important defect of open loop simultaneous techniques is that its frequency relies on spy
Property, when mains frequency changes, the precision of OLS technologies can reduce.
The content of the invention
To overcome in existing simultaneous techniques, closed-loop synchronization technical stability deficiency, while open loop simultaneous techniques is to power network
The problem of frequency requirement is too high, and accuracy of detection is not high, there is provided one kind is based on moving average filter (moving average
Filter, hereinafter referred to as MAF) open loop synchronous method to power network phase-angle detection.
Method provided by the invention includes：
S1, the three-phase voltage of power network is obtained, Clark conversion is carried out to the three-phase voltage and Park converts to obtain first
Voltage signal and second voltage signal；
S2, the interference volume in the first voltage signal and second voltage signal is filtered out using moving average filter, is obtained
Take tertiary voltage signal and the 4th voltage signal；
S3, according to the tertiary voltage signal and the 4th voltage signal, power network phase angle is detected.
Wherein, in the step S1, for single-phase voltage, inputted as the three-phase voltage of Voltage unbalance.
Wherein, in the step S1, Clark conversion is carried out to the three-phase voltage and Park converts to obtain first voltage
Signal and second voltage signal are specially：
S11, the three-phase voltage is transformed to the two-phase voltage u based on α β reference axisαAnd uβ；
S12, by the two-phase voltage u based on α β axlesαAnd uβIt is transformed to the two-phase voltage u based on rotation dq reference axisd
And uq。
Wherein, filter out the first voltage signal using moving average filter described in step S2 and second voltage is believed
Interference volume in number is specially：By moving average filter, to the two-phase voltage u obtained in step S1dAnd uqIn frequency
The interference volumes such as saltus step, amplitude jump, phase angle saltus step, harmonic wave, noise, DC quantity are filtered out.
Wherein, filter out the first voltage signal using moving average filter described in step S2 and second voltage is believed
Interference volume in number is specially：
According to formulaCalculate electricity after filtering
Press signal；
Wherein：N=fs/fw, fsFor sample frequency；fw=1/Tw, TwFor the length of window of moving average filter；v(k)
For input voltage signal,For output voltage signal.
Wherein, the moving average filter is that one or more moving average filters are composed in series.
Wherein, power network phase angle is examined according to the tertiary voltage signal and the 4th voltage signal described in step S3
Survey is specially：
S31, the tertiary voltage signal and the 4th voltage signal of moving average filter output are carried out returning amplitude to return
One change is handled；
S32, power network phase angle is detected according to the voltage signal after amplitude normalized.
Wherein, also include in step S32：Calculate detection phase angle error value θ during mains frequency changeMAF, carrying out phase
During angle is detected, testing result is compensated according to the detection phase angle error value.
Wherein, in addition to by power network phase angle to power network amplitude and frequency offset detect.
Wherein, it is described that frequency offset is detected specially：Pass through formula Δ f=θMAF/[π×(Tw-1/fs)] meter
Calculate frequency offset Δ f；
In formula, θMAFFor phase-angle detection error amount, fsIt is sample frequency, TwFor the length of window of moving average filter.
Open loop synchronous method provided by the invention based on moving average filter to power network phase-angle detection, combine out
Ring simultaneous techniques need not increase any feedback in phase detecting part, have the characteristics of absolute stability and fast response time, together
When by with reference to moving average filter, the antijamming capability of this method when improving mains frequency fluctuation, improving synchronous essence
Degree.
Brief description of the drawings
Fig. 1 is a kind of based on open loop of the moving average filter to power network phase-angle detection of one embodiment of the invention offer
The flow chart of synchronous method；
Fig. 2 is that moving average filter in length of window is 0.02s and 0.01s amplitude response figure in the present invention；
Fig. 3 is single MAF in the present invention, MAF and three series connection MAF of two series connection amplitude response figure；
Fig. 4 is a kind of being opened based on moving average filter power network phase-angle detection of another embodiment of the present invention offer
The concrete structure diagram of ring synchronous method；
Fig. 5 is the MAF-OLS testing results and PMAF-PLL comparison diagrams that further embodiment of this invention provides；
Fig. 6 is the MAF-OLS testing results and PMAF-PLL comparison diagrams that yet another embodiment of the invention provides.
Embodiment
With reference to the accompanying drawings and examples, the embodiment of the present invention is described in further detail.Implement below
Example is used to illustrate the present invention, but is not limited to the scope of the present invention.
With reference to figure 1, Fig. 1 is that one kind that one embodiment of the invention provides is based on moving average filter to the inspection of power network phase angle
The flow chart of the open loop synchronous method of survey, as shown in figure 1, methods described includes：
S1, the three-phase voltage of power network is obtained, Clark conversion is carried out to the three-phase voltage and Park converts to obtain first
Voltage signal and second voltage signal.
Specifically, collecting the three-phase voltage of power network first, three-phase voltage includes three data u herea、ubAnd uc, lead to
Cross Clark conversion and Park conversion so that the data for the three-phase voltage being originally taken are converted into udAnd uq, u hereindAs first
Voltage signal, uqAs second voltage signal.
S2, the interference volume in the first voltage signal and second voltage signal is filtered out using moving average filter, is obtained
Take tertiary voltage signal and the 4th voltage signal.
Specifically, by moving average filter, to the two-phase voltage u obtained in step S1dAnd uqIn frequency hopping,
The interference volumes such as amplitude jump, phase angle saltus step, harmonic wave, noise, DC quantity are filtered out, the u that will be calculated in S1dAnd uqConversion
For the tertiary voltage signal u handled after filteringd1With the 4th voltage signal uq1。
MAF filtering principles are represented by：
Wherein N=fs/fw, fsIt is sample frequency fw=1/Tw。TwIt is MAF length of window.V (k) andIt is the defeated of MAF
Enter and output signal.By formula (1) by MAF be equivalent to impulse response for h (m)=[1,1 ..., 1] (m=0,
1 ..., N-1) limited pulsed frequency response filter (FIR).
MAF frequency response can be expressed as：
It can be drawn by formula (2)：
Wherein n is integer and not equal to 0.Know that MAF is in f by formula (3)wIntegral multiple frequency under, frequency response 0.
That is MAF can filter out the interference volume of these frequencies completely.
When line voltage is without frequency fluctuation, MAFTw=0.02sAnd MAFTw=0.01sAmplitude response with reference to figure 2, Fig. 2 is this hair
Bright middle moving average filter is in the amplitude response figure that length of window is 0.02s and 0.01s.According to Fig. 2, for
MAFTw=0.02s, the amplitude for the interference volume that frequency is 50nHz (n ≠ 0) can be suppressed to below -50dB；For MAFTw=0.01s,
The amplitude for the interference volume that frequency is 100nHz (n ≠ 0) can be suppressed to below -50dB, MAF is considered as filtering out
State the interference volume of respective frequencies.However, as seen from Figure 2, to MAFTw=0.01s, the width near 50Hz odd-multiple subharmonic
Value response is very high, and this shows MAFTw=0.01sTo filtering out for the DC component in mains voltage signal and even harmonics component
Ability is poor (even-order harmonic converts by Park, can become input signal of the odd harmonic as MAF).Therefore
MAFTw=0.01sBe only applicable to not have in power network or only a small amount of DC influence and even-order harmonic interference situation.
Due to MAFTw=0.01sThe defects of described in epimere be present, the wave filter in the present embodiment uses MAFTw=0.02s.Root
According to the analysis of epimere, when line voltage is without frequency fluctuation, MAFTw=0.02sIt is considered as rejection frequency being completely 50nHz
The interference volume of (n ≠ 0).
S3, according to the tertiary voltage signal and the 4th voltage signal, power network phase angle is detected.
Specifically, according to the tertiary voltage signal u obtained in S2d1With the 4th voltage signal uq1, power network phase angle is carried out
Calculate, obtain power network phase angle theta+1。
By the method, based on dq axles, and the open loop simultaneous techniques of only one Park conversion module, in phase-detection
Part need not increase any feedback, have the characteristics of absolute stability and fast response time, while the MAF structures connected improve
The antijamming capability of this method, improves synchronization accuracy during mains frequency fluctuation.
It is unbalanced as voltage for single-phase voltage in the step S1 on the basis of above-described embodiment
Three-phase voltage is inputted.
Specifically, monophase system can be regarded as the three-phase system of Voltage unbalance, and set uα=2uin, uβ=0, therefore
Open loop synchronous method provided by the invention based on moving average filter to power network phase-angle detection can be used for monophase system
In.
On the basis of above-described embodiment, in step S1, Clark conversion is carried out to the three-phase voltage and Park is converted
Obtain first voltage signal and second voltage signal is specially：
S11, the three-phase voltage is transformed to the two-phase voltage u based on α β reference axisαAnd uβ；
S12, by the two-phase voltage u based on α β axlesαAnd uβIt is transformed to the two-phase voltage u based on rotation dq reference axisd
And uq。
Specifically, being converted by Clark, three-phase voltage is changed into ua、ub、ucIt is transformed to two based on static α β reference axis
Phase voltage uα、uβ, wherein, the line voltage vector on α β axles can be expressed as：
Whereinfa=f0+ Δ f, faIt is mains frequency, f0It is system nominal frequency, Δ f is voltage wave
Momentum.V+1And θ+1(VnAnd θn) it is power network fundamental frequency positive-sequence component (fundamental-frequency respectively
Positive-sequence, FFPS) amplitude and phase angle (amplitude and phase angle of nth harmonic component).
After Clark conversion, then Park conversion is carried out, the two-phase voltage u based on static α β reference axisαAnd uβIt is transformed to
Two-phase voltage u based on rotation dq reference axisdAnd uq, can be expressed as with plural form：
Wherein θrf=∫ ωrfDt=2 π frfT, Δ θ+1It is a value for being similar to DC quantity, θrfIt is the rotation of Park conversion
Corner.Herein, by frfIt is arranged to nominal frequency f0, i.e. frf=f0=50Hz.Equation (5) shows, Park conversion be equivalent to by
Voltage vector is with θrfFor angle reverse rotation, or with-θrfRotated for angle.Converted by Park, frequency nfa(wherein n is whole
Number) frequency (nf can be changed intoa-f0)。
On the basis of the various embodiments described above, methods described also includes：Moving average filter is used described in step S2
The interference volume filtered out in the first voltage signal and second voltage signal is specially：By moving average filter, to step
The two-phase voltage u obtained in S1dAnd uqIn frequency hopping, amplitude jump, phase angle saltus step, harmonic wave, noise, the interference such as DC quantity
Amount is filtered out.
Wherein, according to formulaCalculate filtered
The voltage signal of ripple；
Wherein：N=fs/fw, fsFor sample frequency；fw=1/Tw, TwFor the length of window of moving average filter；v(k)
For input voltage signal,For output voltage signal.
Specifically, due to mains frequency f under actual conditionsaIt is excessive nominal frequency is not deviated by, in formula (5)
It is approximately a DC quantity.If this value can be extracted to obtain, Δ θ+1Can also thus it draw.FFPS phase angle thetas on dq axles+1
It can be referred to as：
θ+1=Δ θ+1+θrf (6)
In order to extract DC quantity(5) interference volume inIt need to be filtered out, this is dry
It by frequency is nf that the amount of disturbing, which is,a-f0=(n-1) f0+ n Δs f (n ≠ 1) component composition, it is specially：It is straight in mains voltage signal
Flow component (equivalent to n=0), negative sequence component (n=-1) and harmonic component (n=± 2, ± 3 ...).Above-mentioned interference volume meeting
Concussion is produced in the detection of phase angle and frequency.MAF can be used for filtering out interference volume described above, extract approximate direct current point
Amount
MAF filtering principles are represented by above-mentioned formula (1), wherein N=fs/fw, fsIt is sample frequency fw=1/Tw。TwIt is
MAF length of window.V (k) andIt is MAF input and output signal.MAF is equivalent to by impulse response by formula (1)
For the limited pulsed frequency response filter (FIR) of h (m)=[1,1 ..., 1] (m=0,1 ..., N-1).
On the basis of the various embodiments described above, the moving average filter is one or more moving average filters
It is composed in series.
Specifically, when line voltage is without frequency fluctuation, MAFTw=0.02sBe considered as can rejection frequency completely be
50nHz (n ≠ 0) interference volume.However, if line voltage has a Δ f frequency offset, the interference volume in voltage can be changed into
(n-1)f0+nΔf(n≠1).The value is represented by by the decay of voltage magnitude after MAF：
From (7), as frequency change, MAFTw=0.02sWhole interference volumes can no longer be effectively filtered out.Therefore series connection is multiple
MAFTw=0.02sTo solve this problem.Using a MAF, two MAF (MAF to connect2), three series connection MAF (MAF3)
Amplitude response curve comparison is with reference to figure 3, and Fig. 3 is single MAF in the present invention, MAF and three series connection MAF of two series connection amplitude
Response diagram, as shown in figure 3, the MAF structures of series connection can effectively reduce amplitude response, you can to filter out under frequency change
Interference volume.To make effect apparent, the amplitude attenuation analysis near 100Hz is listed in table 1.MR in table 1 is MAF amplitude
Respond (unit dB), PP is the percentage for the interference volume not being filtered out.As shown in Table 1, by using series connection MAF knot
Structure, the amplitude response near 100Hz have obtained effective reduction, i.e. filtration result has obtained effective lifting.According to three series connection
MAF structures, maximum interference volume percent of pass is also reduced to 1%.
Amplitude attenuation analysis near the 100Hz of table 1
On the basis of the various embodiments described above, methods described also includes：Detection phase angle when calculating mains frequency change misses
Difference, during phase-angle detection is carried out, testing result is compensated according to the detection phase angle error value.
Specifically, for MAF, another problem is, if the frequency change of line voltage, the approximate DC amount in formula (5)Phase angle shift and amplitude attenuation can be produced by MAF, is changed intoAndHere it is the frequencydependence characteristic of open loop simultaneous techniques --- when line voltage frequency
During fluctuation, the detection of phase angle, frequency can produce a steady state error value relevant with mains frequency offset.By to error
Value is calculated, and increases compensation tache in OLS structures, can compensate error, ensures precision, while frequency offset also may be used
With according to the error of phase angle by being calculated.Wherein, phase angle shift caused by MAF (phase-angle detection error amount) is denoted as：
ΔθMAF=∠ H (Δ f)=π Δ f (1/f0-1/fs) (8)
Amplitude attenuation (amplitude detection error amount) is denoted as：
MAF of the phase angle shift by series connection is changed into m Δs θMAF, amplitude attenuation is changed into | H (Δ f) |m(m is series connection MAF number
Amount, the m=3 if 3 MAF that connect).
In another embodiment of the invention, with reference to figure 4, Fig. 4 is that one kind that another embodiment of the present invention provides is based on moving
The concrete structure diagram of dynamic open loop synchronous method of the average filter to power network phase-angle detection.
As shown in figure 4, three-phase voltage ua、ub、uc(or in monophase system, regard voltage as three-phase, and set vα=2vin,
vβ=0) two-phase voltage u is obtained after Clark is convertedα、uβ, converted again by plural Park, and with θ+1As its anglec of rotation, its
Middle θ+1It is power network fundamental frequency positive-sequence component (fundamental-frequency positive-sequence, FFPS) phase
Angle, so as to obtain two-phase voltage ud、uq.Calculated according to the analysis of formula (5), draw the mathematical table of the interference volume in voltage signal
Up to formula：It is to carry out the amount extracted required for the detection such as phase angle
Thereafter, MAF is increased to filter out interference volumeWhen frequency changes, to be extracted
Amount byChange turns to(wherein Δ θMAFPhase-angle detection error amount caused by changing for frequency), using string
Join the antijamming capability of multiple MAF method strengthening system.According to three MAF of analysis series connectionTw=0.02sInstitute can be substantially filtered out
There is interference volume.
Finally, amplitude normalization is carried out to filter MAF output signal, makes the result of phase-angle detection no longer by amplitude change
Influence.Analyzed according to formula (8), when line voltage frequency converts, MAF is while interference volume is filtered out, in phase angle and amplitude
Detection in have an error amount relevant with frequency offset, by phase-angle detection error amount Δ θMAFCalculated,
Increase a compensation tache in the structure to compensate the error amount in phase-angle detection.And Δ θ can be passed throughMAFValue to amplitude
V+1Detected with the offset Δ f of frequency.
In the structure shown here, system rejection to disturbance ability during using three MAF series connection improving line voltage frequency fluctuation.
FFPS final output phase angle can be expressed as below：
θ+1=Δ θ+1+θrf-3ΔθMAF (10)
WhereinΔθ+1It is power network
Detection phase angle error value when frequency changes, increases the value to eliminate the error in phase angle is exported.
According to formula (8) and (9), the offset of frequency and the detected value of amplitude can obtain：
Δ f=θMAF/[π×(Tw-1/fs)]=θMAFK1 (11)
Wherein K1=1/ [π × (Tw-1/fs)],Phase-detection and frequency and width
The part of value detection is separated, if frequency and amplitude need not be detected, corresponding part can be removed.
Monophase system can be regarded as the three-phase system of Voltage unbalance, and set vα=2vin, vβ=0.Therefore shown in Fig. 4
MAF-OLS can also be used in monophase system.
Three MAF are employed in shown structure chart to be connected.K in figure1And K2It can be calculated by formula (12)
Go out.When mains frequency changes, the pad value and frequency offset of amplitude can be by K1And K2Value by being calculated.It is actual
On in three-phase system, power network in the case of light contamination, using two series connection MAF can meet simultaneous techniques
Antijamming capability.Using MAF2Structure there is faster response speed, but antijamming capability is less than using MAF3Structure
(in figurePart is amplitude normalization, makes the occurrence of amplitude phase-angle detection will not be had an impact).
In another embodiment of the invention, realized by Matlab software programmings to a series of emulation experiments, this is sent out
The MAF-OLS of bright proposition is contrasted with PMAF-PLL of the prior art, verifies that MAF-OLS's proposed by the present invention is effective
Property.
In the present embodiment, sample frequency is arranged to 10kHz, and nominal frequency is arranged to 50Hz, and the parameter of PI controllers is ki
=40426, kp=804.Because monophase system is considered as unbalanced three-phase system, therefore the present embodiment uses monophase system.
On preferable sine voltage signal, during t=0.5s, 180 ° of phase hits are added.(input signal in t=0.5s, by s1=
Sin (2*pi*f*t+1*pi/1) changes to s2=sin (2*pi*f*t)) as shown in figure 5, scheming, 5 represent testing result, real in two
The tracking without visible steady-state error can be realized to ideal type by testing, and precision is higher.However, MAF-OLS dynamic responding speed
It is faster than PMAF-PLL.
In order under severeer grid conditions to set forth herein method test, during t=0.5s, in experiment one
On the basis of input signal, 2Hz frequency hoppings are added again, total amount is 30% for 2 times, 3 times, 5 times, 7 times, 9 subharmonic, 0.5pu
DC component, 50% amplitude incrementss and 50dB white noise.Input signal is in t=0.5s, by s1=sin (2*
Pi*f*t+1*pi/1) it is changed into s2=0.5+1.5*sin (2*pi*f*t)+0.3*sin (4*pi*f*t)+0.3*sin (6*pi*
F*t)+0.3*sin (10 * pi*f*t)+0.3*sin (14*pi*f*t)+0.3*sin (18*pi*f*t) and f=50 is changed into f=
52；And add white noise：S2=awgn (s2,50).
For testing result with reference to figure 6, Fig. 6 represents that MAF-OLS method has faster response speed；It can be seen by Fig. 6
Go out, under undesirable grid conditions, MAF-OLS has faster response speed and higher precision than PMAF-PLL.
A kind of MAF-OLS methods proposed by the present invention, it is that one kind is based on dq axles, and an only Park conversion module
Open loop simultaneous techniques.This method need not increase any feedback in phase detecting part, therefore with absolute stability and response speed
Spend the characteristics of fast.The method of the closed-loop synchronization technology based on phaselocked loop than being widely used at present has simpler structure,
Stability and parameter need not be analyzed and selected, and amount of calculation is also smaller.The MAF structures of series connection improve power network
The antijamming capability of this method during frequency fluctuation, thus MAF-OLS can be provided under undesirable grid conditions it is higher same
Walk precision,
Finally, the present processes are only preferable embodiment, are not intended to limit the scope of the present invention.It is all
Within the spirit and principles in the present invention, any modification, equivalent substitution and improvements made etc., it should be included in the guarantor of the present invention
Within the scope of shield.
Claims (10)
- A kind of 1. open loop synchronous method based on moving average filter to power network phase-angle detection, it is characterised in that including：S1, the three-phase voltage of power network is obtained, Clark conversion is carried out to the three-phase voltage and Park converts to obtain first voltage letter Number and second voltage signal；S2, the interference volume in the first voltage signal and second voltage signal is filtered out using moving average filter, obtain the Three voltage signals and the 4th voltage signal；S3, according to the tertiary voltage signal and the 4th voltage signal, power network phase angle is detected.
- 2. according to the method for claim 1, it is characterised in that in the step S1, for single-phase voltage, as electricity Unbalanced three-phase voltage is pressed to be inputted.
- 3. according to the method for claim 1, it is characterised in that in step S1, Clark conversion is carried out to the three-phase voltage Convert to obtain first voltage signal with Park and second voltage signal is specially：S11, the three-phase voltage is transformed to the two-phase voltage u based on α β reference axisαAnd uβ；S12, by the two-phase voltage u based on α β axlesαAnd uβIt is transformed to the two-phase voltage u based on rotation dq reference axisdAnd uq。
- 4. according to the method for claim 3, it is characterised in that filter out institute using moving average filter described in step S2 The interference volume stated in first voltage signal and second voltage signal is specially：By moving average filter, to being obtained in step S1 The two-phase voltage u takendAnd uqIn frequency hopping, amplitude jump, phase angle saltus step, harmonic wave, noise, the interference volume such as DC quantity carry out Filter out.
- 5. according to the method for claim 4, it is characterised in that filter out institute using moving average filter described in step S2 The interference volume stated in first voltage signal and second voltage signal is specially：According to formulaCalculate voltage letter after filtering Number；Wherein：N=fs/fw, fsFor sample frequency；fw=1/Tw, TwFor the length of window of moving average filter；V (k) is input Voltage signal,For output voltage signal.
- 6. according to the method for claim 1, it is characterised in that the moving average filter is one or more mobile flat Equal filters in series composition.
- 7. according to the method for claim 1, it is characterised in that according to the tertiary voltage signal and the described in step S3 Four voltage signals, power network phase angle is detected specially：S31, the tertiary voltage signal and the 4th voltage signal of moving average filter output are carried out returning amplitude to normalize Processing；S32, power network phase angle is detected according to the voltage signal after amplitude normalized.
- 8. according to the method for claim 6, it is characterised in that also include in step S32：Calculate when mains frequency changes Detect phase angle error value θMAF, during phase-angle detection is carried out, testing result is carried out according to the detection phase angle error value Compensation.
- 9. according to the method for claim 1, it is characterised in that also include inclined to power network amplitude and frequency by power network phase angle Shifting amount is detected.
- 10. according to the method for claim 9, it is characterised in that described that frequency offset is detected specially：Pass through Formula Δ f=θMAF/[π×(Tw-1/fs)] calculate frequency offset Δ f；In formula, θMAFFor phase-angle detection error amount, fsIt is sample frequency, TwFor the length of window of moving average filter.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110470904A (en) * | 2019-07-11 | 2019-11-19 | 中国农业大学 | Synchronous phasor measuring method and device based on flat window filter |
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