CN107271753A - Voltage flicker detection and device - Google Patents
Voltage flicker detection and device Download PDFInfo
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Abstract
The present invention provides a kind of Voltage flicker detection and device.Applied to digital flicker detection instrument, the table of comparisons of amplitude modulation wave frequency rate and magnitude of a voltage fluctuation is preserved in digital flicker detection instrument, methods described includes：The voltage signal of many amplitude modulation wave frequency rates is detected, the voltage signal of many amplitude modulation wave frequency rates is obtained, analysis calculating is carried out to the voltage signal of many amplitude modulation wave frequency rates according to dynamic vector method, the magnitude of a voltage fluctuation of many amplitude modulation wave frequency rates is obtained.Calculating processing is carried out to the magnitude of a voltage fluctuation of many amplitude modulation wave frequency rates according to the table of comparisons of amplitude modulation wave frequency rate and magnitude of a voltage fluctuation, voltage flicker testing result is obtained.Thus, voltage flicker detection process is simplified, amount of calculation is small, can quickly obtains voltage flicker testing result, improve detection efficiency and measurement accuracy, reduce detection error, with good engineer applied and theory analysis prospect.
Description
Technical field
The present invention relates to voltage detecting technical field, in particular to a kind of Voltage flicker detection and device.
Background technology
It is irresistible that novel electric power system is had become using wind-power electricity generation, photovoltaic generation as the new energy grid-connected power of representative
Development trend.The power output of this kind of regenerative resource of solar energy, wind energy has stronger fluctuation, easily causes power network public
Voltage fluctuation and flicker at common tie point.And voltage flicker phenomenon can cause harm to the live and work of people.Illumination light
The flicker in source can allow the vision of people to produce fatigue, and infringement is produced to the eyes of people.Voltage flicker influences the normal fortune of motor
OK, the operating efficiency of enterprise is influenceed.
At present, the voltage pulsation detection method commonly used in the world mainly has square examination method, rectification detection method and virtual value
Detection method.The Digital Realization of rectification detection method and RMS to DC method is more difficult, it is impossible to effectively to mutation, non-stationary
Voltage flicker envelope signal detected.
The general square examination method recommended using IEC of China's voltage flicker detection, the square examination method that IEC recommends is with mould
As defined in plan mode, there is no clear and definite implementation method to each link, it is impossible to carry out actual numerical computations, using when need foundation
IEC flicker measurements principle is designed to each link digital filter.
In the prior art, often using digital flickermeter progress numerical computations, but calculating process is cumbersome, measurement error compared with
Greatly.
The content of the invention
In order to overcome above-mentioned deficiency of the prior art, the technical problems to be solved by the invention are to provide a kind of voltage and dodged
Become detection method and device, which simplify voltage flicker detection process, amount of calculation is small, can quickly obtain voltage flicker detection knot
Really, detection efficiency is improved, detection error is reduced.
The first object of the present invention is to provide a kind of Voltage flicker detection, applied to digital flicker detection instrument,
The table of comparisons of amplitude modulation wave frequency rate and magnitude of a voltage fluctuation is preserved in the digital flicker detection instrument, methods described includes：
The voltage signal of many amplitude modulation wave frequency rates is detected, the voltage signal of many amplitude modulation wave frequency rates is obtained, according to dynamic
Vector method carries out analysis calculating to the voltage signal of many amplitude modulation wave frequency rates, obtains the magnitude of a voltage fluctuation of many amplitude modulation wave frequency rates；
According to magnitude of a voltage fluctuation of the table of comparisons of the amplitude modulation wave frequency rate and magnitude of a voltage fluctuation to many amplitude modulation wave frequency rates
Calculating processing is carried out, voltage flicker testing result is obtained.
The second object of the present invention is a kind of voltage flicker detection means, described applied to digital flicker detection instrument
The table of comparisons of amplitude modulation wave frequency rate and magnitude of a voltage fluctuation is preserved in digital flicker detection instrument, described device includes：
Computing module is detected, is detected for the voltage signal to many amplitude modulation wave frequency rates, obtains many amplitude modulation wave frequency rates
Voltage signal, carries out analysis calculating to the voltage signal of many amplitude modulation wave frequency rates according to dynamic vector method, obtains many amplitude modulation wave frequency rates
Magnitude of a voltage fluctuation；
Processing module is calculated, for the table of comparisons according to the amplitude modulation wave frequency rate and magnitude of a voltage fluctuation to many amplitude-modulated waves
The magnitude of a voltage fluctuation of frequency carries out calculating processing, obtains voltage flicker testing result.
In terms of existing technologies, the invention has the advantages that：
The present invention provides a kind of Voltage flicker detection and device.Applied to digital flicker detection instrument, the numeral
The table of comparisons of amplitude modulation wave frequency rate and magnitude of a voltage fluctuation is preserved in formula flicker detection instrument, methods described includes：To many amplitude modulation wave frequencies
The voltage signal of rate is detected, obtains the voltage signal of many amplitude modulation wave frequency rates, according to dynamic vector method to many amplitude modulation wave frequency rates
Voltage signal carry out analysis calculating, obtain the magnitude of a voltage fluctuation of many amplitude modulation wave frequency rates.According to the amplitude modulation wave frequency rate and voltage
The table of comparisons of undulating value carries out calculating processing to the magnitude of a voltage fluctuation of many amplitude modulation wave frequency rates, obtains voltage flicker detection knot
Really.Thus, voltage flicker detection process is simplified, amount of calculation is small, can quickly obtains voltage flicker testing result, improve detection
Efficiency and measurement accuracy, reduce detection error, with good engineer applied and theory analysis prospect.
Brief description of the drawings
In order to illustrate the technical solution of the embodiments of the present invention more clearly, below will be attached to what is used required in embodiment
Figure is briefly described, it will be appreciated that the following drawings illustrate only certain embodiments of the present invention, therefore is not construed as pair
The restriction of scope, for those of ordinary skill in the art, on the premise of not paying creative work, can also be according to this
A little accompanying drawings obtain other related accompanying drawings.
Fig. 1 is the block diagram for the digital flicker detection instrument that present pre-ferred embodiments are provided.
Fig. 2 is one of step flow chart of Voltage flicker detection that first embodiment of the invention is provided.
Fig. 3 is the two of the step flow chart for the Voltage flicker detection that first embodiment of the invention is provided.
Fig. 4 is the sub-step flow chart of the step S110 shown in Fig. 3 that first embodiment of the invention is provided.
Fig. 5 is the sub-step flow chart of the sub-step S111 shown in Fig. 4 that first embodiment of the invention is provided.
Fig. 6 is the sub-step flow chart of the step S120 shown in Fig. 2 that first embodiment of the invention is provided.
Fig. 7 is the sub-step flow chart of the step S130 shown in Fig. 2 that first embodiment of the invention is provided.
The functional block diagram for the voltage flicker detection means that Fig. 8 provides for second embodiment of the invention.
Icon：The digital flicker detection instrument of 100-；110- memories；120- processors；200- voltage flicker detection means；
210- detects computing module；220- calculates processing module.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is a part of embodiment of the invention, rather than whole embodiments.Generally herein
The component of the embodiment of the present invention described and illustrated in place's accompanying drawing can be arranged and designed with a variety of configurations.Therefore,
The detailed description of the embodiments of the invention to providing in the accompanying drawings is not intended to limit the model of claimed invention below
Enclose, but be merely representative of the selected embodiment of the present invention.Based on the embodiment in the present invention, those of ordinary skill in the art are not having
There is the every other embodiment made and obtained under the premise of creative work, belong to the scope of protection of the invention.
It should be noted that：Similar label and letter represents similar terms in following accompanying drawing, therefore, once a certain Xiang Yi
It is defined in individual accompanying drawing, then it further need not be defined and explained in subsequent accompanying drawing.In addition, term " the
One ", " second " etc. is only used for distinguishing description, and it is not intended that indicating or implying relative importance.
Fig. 1 is refer to, Fig. 1 is the block diagram for the digital flicker detection instrument 100 that present pre-ferred embodiments are provided.
The digital flicker detection instrument 100 includes memory 110, voltage flicker detection means 200 and processor 120.
The memory 110 and processor 120 are directly or indirectly electrically connected with each other, to realize the transmission of data
Or interaction.It is electrically connected with for example, these elements can be realized by one or more communication bus or signal wire each other.Storage
Be stored with voltage flicker detection means 200 in device 110, and the voltage flicker detection means 200 can be with software including at least one
Or the form of firmware (firmware) is stored in the software function module in the memory 110, the processor 120 passes through fortune
Row is stored in software program and module in memory 110, so as to perform various function application and data processing.
Wherein, the memory 110 may be, but not limited to, random access memory (Random Access
Memory, RAM), read-only storage (Read Only Memory, ROM), programmable read only memory (Programmable
Read-Only Memory, PROM), erasable read-only memory (Erasable Programmable Read-Only
Memory, EPROM), electricallyerasable ROM (EEROM) (Electric Erasable Programmable Read-Only
Memory, EEPROM) etc..Wherein, memory 110 be used for storage program, the processor 120 after execute instruction is received,
Perform described program.Further, the software program and module in above-mentioned memory 110 may also include operating system, and it can
Including the various component softwares for management system task (such as memory management, storage device control, power management) and/or
Driving, and can be in communication with each other with various hardware or component software, so as to provide the running environment of other software component.
The processor 120 can be a kind of IC chip, the disposal ability with signal.Above-mentioned processor
120 can be general processor, including central processing unit (Central Processing Unit, CPU), network processing unit
(Network Processor, NP) etc..Can realize or perform disclosed each method in the embodiment of the present invention, step and
Logic diagram.General processor can be microprocessor or the processor can also be any conventional processor etc..
It is appreciated that the structure described in Fig. 1 is only signal, digital flicker detection instrument 100 may also include than shown in Fig. 1
More either less components or with the configuration different from shown in Fig. 1.Each component shown in Fig. 1 can using hardware,
Software or its combination are realized.
First embodiment
Refer to Fig. 2, Fig. 2 be the Voltage flicker detection that first embodiment of the invention is provided step flow chart it
One.Methods described is applied to preserve amplitude modulation wave frequency in digital flicker detection instrument 100, the digital flicker detection instrument 100
The table of comparisons of rate and magnitude of a voltage fluctuation.The idiographic flow of Voltage flicker detection is described in detail below.
Step S120, is detected to the voltage signal of many amplitude modulation wave frequency rates, obtains the voltage signal of many amplitude modulation wave frequency rates,
Analysis calculating is carried out to the voltage signal of many amplitude modulation wave frequency rates according to dynamic vector method, the voltage pulsation of many amplitude modulation wave frequency rates is obtained
Value.
Step S130, according to electricity of the table of comparisons of the amplitude modulation wave frequency rate and magnitude of a voltage fluctuation to many amplitude modulation wave frequency rates
Press undulating value to carry out calculating processing, obtain voltage flicker testing result.
Refer to Fig. 3, Fig. 3 be the Voltage flicker detection that first embodiment of the invention is provided step flow chart it
Two.Methods described also includes：
Step S110, detects to the voltage signal of multiple different single amplitude modulation wave frequency rates, obtains corresponding voltage
Signal, carries out analysis calculating to voltage signal according to dynamic vector method, obtains the table of comparisons of amplitude modulation wave frequency rate and magnitude of a voltage fluctuation.
In the present embodiment, in order to set up the table of comparisons of amplitude modulation wave frequency rate and magnitude of a voltage fluctuation, it is necessary to be directed to multiple differences
Amplitude modulation wave frequency rate, carry out the voltage signal situation detection of multiple single amplitude modulation wave frequency rate.
Fig. 4 is refer to, Fig. 4 is the sub-step flow chart of the step S110 shown in Fig. 3 that first embodiment of the invention is provided.
The step S110 includes sub-step S111 and sub-step S112.
Sub-step S111, detects to the voltage signal of each single amplitude modulation wave frequency rate, obtains corresponding voltage respectively
Signal, carries out analysis calculating to the voltage signal according to dynamic vector method, obtains pair of amplitude modulation wave frequency rate and magnitude of a voltage fluctuation
According to relation.
Fig. 5 is refer to, Fig. 5 is the sub-step flow of the sub-step S111 shown in Fig. 4 that first embodiment of the invention is provided
Figure.The sub-step S111 includes sub-step S1110, sub-step S1111 and sub-step S1112.
Sub-step S1110, when being detected every time to the voltage signal of single amplitude modulation wave frequency rate, during according to default sampling
Between be spaced in predetermined period the voltage signal of the amplitude modulation wave frequency rate of current detection be acquired, and to the voltage signal of collection
Carry out root-mean-square valve calculating and obtain r.m.s. sequence.
In the present embodiment, the voltage signal of collection is the voltage signal gathered at new-energy grid-connected, the new energy
Grid-connected place refers at the link position of photovoltaic or wind-powered electricity generation and power network.
In the present embodiment, the digital flicker detection instrument 100 exists according to default sampling time interval (such as, 20ms)
The voltage signal of the amplitude modulation wave frequency rate of current detection is acquired in predetermined period (such as, 10s), and it is each to what is collected
Voltage signal carries out preliminary treatment, obtains voltage signal instantaneous value：
U (t)=A (1+mcos2 π fm)cos2πfst
The digital flicker detection instrument 100 carries out root-mean-square valve (RMS, Root Mean to voltage signal instantaneous value
Square) calculate and obtain r.m.s. sequence (such as, y (t)), the expression formula of the r.m.s. sequences y (t) is as follows：
Wherein, A is the amplitude of work frequency carrier voltage, fsFor the frequency of work frequency carrier voltage, fs=50Hz, m are amplitude-modulated wave electricity
The relative magnitude of pressure.fmFor the frequency of amplitude modulation wave voltage, T=0.02s,
In the present embodiment, r.m.s. (RMS) is also known as root mean square, be define alternating current (Alternating Current,
AC a kind of) most common mathematical method of effective voltage or electric current.Computation sequence is first square, is then averaging, finally opens flat
Side.
Sub-step S1111, according to dynamic vector method to the r.m.s. sequence carry out Fourier transformation, obtain dynamic to
Amount.
In the present embodiment, the digital flicker detection instrument 100 asks for r.m.s. sequences y (t) using dynamic vector method
Result after Fourier transformation, obtains kth output valves of the y (t) after Fourier transformation, i.e. the kth rank of y (t) is moved
State vector, expression formula is as follows：
Wherein, it is 20ms according to sampling time interval, predetermined period is T0=10s, can be obtainedFrequently
Rate resolution ratio is that the fundamental frequency after 0.1HZ, i.e. Fourier transformation is 0.1Hz.
Sub-step S1112, the dynamic vector is brought into preset formula and calculated, and obtains the amplitude modulation wave frequency rate
Corresponding magnitude of a voltage fluctuation.
In the present embodiment, the dynamic vector is brought into preset formula by the digital flicker detection instrument 100
Row is calculated, and can obtain under the single amplitude modulation wave frequency rate of current detection so that the RMS-voltage ripple of serious index S=1 of instantaneous flicker
Dynamic value Δ Urms.Wherein, voltage pulsation causes subjective vision reaction of the illumination fluctuation to people to be referred to as instantaneous vermicularizing alloy, generally
Using flickering perceive rate as 50% as instantaneous vermicularizing alloy unit of measurement, i.e. instantaneous vermicularizing alloy S=1.
In the present embodiment, the preset formula can be worth on the basis of DC component (0 rank dynamic vector)
Frequency amplitude relative value, wherein, the frequency amplitude relative value is under the single amplitude modulation wave frequency rate of current detection, when making S=1
Corresponding RMS undulating value Δs UrmsHalf.Calculation formula is as follows：
Wherein, wm.i=2 π fiFor the angular frequency of i-th of amplitude-modulated wave, denominator<y>0Represent the 0th rank dynamic vector, i.e. y (t) warps
The DC component crossed after Fourier transformation.<y>fi/0.1In fi represent the flicker frequency after Fourier transformation, due to fundamental frequency
For 0.1Hz, i.e.,<y>k=<y>fi/0.1。
In the present embodiment, calculated, can obtain by the formula to first equal sign the right and left in above-mentioned formula
Frequency amplitude relative valueFrequency amplitude relative value is multiplied by 2 and can obtain Bfi, BfiIt is f for amplitude modulation wave frequency rateiWhen cause S
=1 RMS-voltage undulating value (that is, Δ Urms).Thus, can obtain current amplitude modulation wave frequency rate and magnitude of a voltage fluctuation compares pass
System.
In the present embodiment, this programme carries out new-energy grid-connected voltage flicker analysis using dynamic vector method, gives tool
The analytical expression of body, new direction is provided for the research of digital flicker detection.
Sub-step S112, generates according to obtained multiple amplitude modulation wave frequency rates and the contrast relationship of magnitude of a voltage fluctuation and stores tune
The table of comparisons of amplitude wave frequency and magnitude of a voltage fluctuation.
In the present embodiment, the digital flicker detection instrument 100 is according to obtained multiple amplitude modulation wave frequency rates and voltage wave
The contrast relationship generation amplitude modulation wave frequency rate of dynamic value and the table of comparisons of magnitude of a voltage fluctuation are simultaneously stored.It is described based on foregoing description
The table of comparisons of amplitude modulation wave frequency rate and magnitude of a voltage fluctuation can be amplitude modulation wave frequency rate (f) and RMS-voltage undulating value (Δ Urms) control
Table.
In the present embodiment, because human eye can only be perceived to the voltage pulsation within 0.05~35Hz, direct current and
More than 35Hz frequency need not be recorded in table.
The step S120 in Fig. 2 is illustrated below based on foregoing description.
Fig. 6 is refer to, Fig. 6 is the sub-step flow chart of the step S120 shown in Fig. 2 that first embodiment of the invention is provided.
The step S120 includes sub-step S121 and sub-step S122.
Sub-step S121, gathers the voltage signal of many amplitude modulation wave frequency rates, to the voltage signal of many amplitude modulation wave frequency rates of collection
Conversion is modulated, and root-mean-square valve is carried out to the voltage signal converted through ovennodulation and calculates the Fang Jun for obtaining many amplitude modulation wave frequency rates
Root sequence.
In the present embodiment, the digital flicker detection instrument 100 gathers many amplitude modulation wave frequency rates at new-energy grid-connected
Voltage signal, and conversion is modulated to the voltage signal, the voltage signal with sinusoidal many amplitude modulation waveshapes is changed into, it is public
Formula is as follows：
Wherein, U is the amplitude of work frequency carrier voltage, and K is the total number of amplitude-modulated wave, miFor the relative width of i-th of amplitude-modulated wave
Value, fiFor the frequency of i-th of amplitude-modulated wave, fsysFor the frequency of work frequency carrier voltage.
In the present embodiment, the described pair of voltage signal converted through ovennodulation carries out root-mean-square valve calculating and obtains many amplitude-modulated waves
The operation of the r.m.s. sequence of frequency is identical with the operation under single amplitude modulation wave frequency rate, specifically see above-mentioned middle sub-paragraphs
S1110 associated description.
Sub-step S122, calculating processing is carried out according to dynamic vector method to the r.m.s. sequence of many amplitude modulation wave frequency rates,
Obtain the magnitude of a voltage fluctuation of many amplitude modulation wave frequency rates.
In the present embodiment, the digital flicker detection instrument 100 according to dynamic vector method to many amplitude modulation wave frequency rates
R.m.s. sequence carry out calculating processing, obtain the magnitude of a voltage fluctuation (A of many amplitude modulation wave frequency ratesfi), wherein, it is described according to dynamic to
Operation and the operation phase under single amplitude modulation wave frequency rate that amount method is handled the r.m.s. sequence of many amplitude modulation wave frequency rates
Together, it specifically see above-mentioned middle sub-paragraphs S1111 and sub-step S1112 associated description.
The step S130 in Fig. 2 is illustrated below based on foregoing description.
Fig. 7 is refer to, Fig. 7 is the sub-step flow chart of the step S130 shown in Fig. 2 that first embodiment of the invention is provided.
The step S130 includes sub-step S131 and sub-step S132.
Sub-step S131, the voltage pulsation according to the table of comparisons of amplitude modulation wave frequency rate and magnitude of a voltage fluctuation to many amplitude modulation wave frequency rates
Value is calculated, and obtains the corresponding instantaneous flicker value of each amplitude modulation wave frequency rate.
In the present embodiment, the digital flicker detection instrument 100 is by inquiring about the amplitude modulation wave frequency rate prestored and electricity
The table of comparisons of undulating value is pressed, the corresponding magnitude of a voltage fluctuation (B of each amplitude modulation wave frequency rate is obtainedfi).The digital flicker detection instrument
100 will inquire about obtained each magnitude of a voltage fluctuation (Bfi) and many amplitude modulation wave frequency rates magnitude of a voltage fluctuation (Afi) it is brought into default sudden strain of a muscle
Calculated in variate formula, obtain corresponding instantaneous flicker value (Sfi).Specific formula is as follows：
Wherein, SfiIt is f to refer to amplitude modulation wave frequency rateiInstantaneous flicker value under component.
In the present embodiment, the frequency range (tune between 0.05~35HZ is perceived to the maximum of voltage flicker positioned at human eye
Amplitude wave frequency) in amplitude modulation wave frequency rate, can be obtained respectively by inquiring about the table of comparisons of the amplitude modulation wave frequency rate and magnitude of a voltage fluctuation
Corresponding magnitude of a voltage fluctuation (the B of individual amplitude modulation wave frequency ratefi).Thus, instantaneous flicker value (S can quickly be calculatedfi), accelerate detection speed
Degree.
In the present embodiment, when carrying out many amplitude-modulated wave frequency voltage flicker detections, above-mentioned steps S110 can be directly invoked
Data in amplitude modulation wave frequency rate and the table of comparisons of magnitude of a voltage fluctuation that middle use dynamic vector method is obtained carry out analysis calculating, accelerate
Detection speed, reduces the harm that voltage flicker is brought, reduces the error of voltage flicker detection algorithm, improves voltage sudden strain of a muscle
Become measurement accuracy.
Multiple instantaneous flicker values are summed, open root calculating, obtain Short Term Flicker value by sub-step S132.
In the present embodiment, the digital flicker detection instrument 100 can be to multiple instantaneous flicker value (Sfi) sum
To total instantaneous flicker value (S), sum formula is as follows：
The total instantaneous flicker value (S) of 100 pairs of digital flicker detection instrument carries out opening root calculating, obtains Short Term Flicker value
(Pst).For the voltage pulsation that periodicity is stable, Short Term Flicker value calculation formula is as follows：
In the present embodiment, this programme applies to dynamic vector in electric network voltage flicker monitoring analysis, breaches accurate steady
The limitation that state assumes, it is contemplated that the dynamic change of phasor amplitude, existing traditional vector method amount of calculation is small, the spy of clear physics conception
Point, and the precision of EM transient calculation has been taken into account to a certain extent.
Second embodiment
It refer to Fig. 8, the functional block diagram for the voltage flicker detection means 200 that Fig. 8 provides for second embodiment of the invention.
The voltage flicker detection means 200, applied to digital flicker detection instrument 100.Described device includes：Detect computing module
210 and calculate processing module 220.
Computing module 210 is detected, is detected for the voltage signal to many amplitude modulation wave frequency rates, obtains many amplitude modulation wave frequency rates
Voltage signal, analysis calculating is carried out to the voltage signals of many amplitude modulation wave frequency rates according to dynamic vector method, many amplitude modulation wave frequencies are obtained
The magnitude of a voltage fluctuation of rate.
In the present embodiment, detection computing module 210 is used to perform the step S120 in Fig. 2, is calculated on the detection
The specific descriptions of module 210 are referred to the description of step S120 in Fig. 2.
Processing module 220 is calculated, for the table of comparisons according to the amplitude modulation wave frequency rate and magnitude of a voltage fluctuation to many tune
The magnitude of a voltage fluctuation of amplitude wave frequency carries out calculating processing, obtains voltage flicker testing result.
In the present embodiment, calculating processing module 220 is used to perform the step S130 in Fig. 2, on calculating processing
The specific descriptions of module 220 are referred to the description of step S130 in Fig. 2.
The detection computing module 210, is additionally operable to examine the voltage signal of multiple different single amplitude modulation wave frequency rates
Survey, obtain corresponding voltage signal, analysis calculating is carried out to voltage signal according to dynamic vector method, amplitude modulation wave frequency rate and electricity is obtained
Press the table of comparisons of undulating value.
In the present embodiment, detection computing module 210 is additionally operable to perform the step S110 in Fig. 3, on the detection meter
The specific descriptions for calculating module 210 can be with the description of step S110 in reference picture 3.
In summary, the present invention provides a kind of Voltage flicker detection and device.Applied to digital flicker detection instrument,
The table of comparisons of amplitude modulation wave frequency rate and magnitude of a voltage fluctuation is preserved in the digital flicker detection instrument, methods described includes：To many
The voltage signal of amplitude modulation wave frequency rate is detected, obtains the voltage signal of many amplitude modulation wave frequency rates, according to dynamic vector method to many tune
The voltage signal of amplitude wave frequency carries out analysis calculating, obtains the magnitude of a voltage fluctuation of many amplitude modulation wave frequency rates.According to the amplitude modulation wave frequency
The table of comparisons of rate and magnitude of a voltage fluctuation carries out calculating processing to the magnitude of a voltage fluctuation of many amplitude modulation wave frequency rates, obtains voltage flicker
Testing result.
Thus, voltage flicker detection process is simplified, amount of calculation is small, can quickly obtains voltage flicker testing result, improved
Detection efficiency and measurement accuracy, reduce detection error, with good engineer applied and theory analysis prospect.
The preferred embodiments of the present invention are the foregoing is only, are not intended to limit the invention, for the skill of this area
For art personnel, the present invention can have various modifications and variations.Within the spirit and principles of the invention, that is made any repaiies
Change, equivalent substitution, improvement etc., should be included in the scope of the protection.
Claims (10)
1. a kind of Voltage flicker detection, applied to digital flicker detection instrument, it is characterised in that the digital flickering inspection
The table of comparisons that amplitude modulation wave frequency rate and magnitude of a voltage fluctuation are preserved in instrument is surveyed, methods described includes：
The voltage signal of many amplitude modulation wave frequency rates is detected, the voltage signal of many amplitude modulation wave frequency rates is obtained, according to dynamic vector
Method carries out analysis calculating to the voltage signal of many amplitude modulation wave frequency rates, obtains the magnitude of a voltage fluctuation of many amplitude modulation wave frequency rates；
The magnitude of a voltage fluctuation of many amplitude modulation wave frequency rates is carried out according to the table of comparisons of the amplitude modulation wave frequency rate and magnitude of a voltage fluctuation
Calculating is handled, and obtains voltage flicker testing result.
2. according to the method described in claim 1, it is characterised in that methods described also includes：
The voltage signal of multiple different single amplitude modulation wave frequency rates is detected, corresponding voltage signal is obtained, according to dynamic
Vector method carries out analysis calculating to voltage signal, obtains the table of comparisons of amplitude modulation wave frequency rate and magnitude of a voltage fluctuation.
3. method according to claim 2, it is characterised in that the voltage to multiple different single amplitude modulation wave frequency rates
Signal is detected, obtains corresponding voltage signal, is carried out analysis calculating to voltage signal according to dynamic vector method, is obtained amplitude modulation
The step of table of comparisons of wave frequency rate and magnitude of a voltage fluctuation, includes：
The voltage signal of each single amplitude modulation wave frequency rate is detected respectively, corresponding voltage signal is obtained, according to dynamic to
Amount method carries out analysis calculating to the voltage signal, obtains amplitude modulation wave frequency rate and the contrast relationship of magnitude of a voltage fluctuation；
Multiple amplitude modulation wave frequency rates and the contrast relationship of magnitude of a voltage fluctuation according to obtaining generate and store amplitude modulation wave frequency rate and voltage
The table of comparisons of undulating value.
4. method according to claim 3, it is characterised in that described to believe respectively the voltage of each single amplitude modulation wave frequency rate
Number detected, obtain corresponding voltage signal, analysis calculating is carried out to the voltage signal according to dynamic vector method, adjusted
The step of amplitude wave frequency and the contrast relationship of magnitude of a voltage fluctuation, includes：
When being detected every time to the voltage signal of single amplitude modulation wave frequency rate, according to default sampling time interval in predetermined period
The voltage signal of the interior amplitude modulation wave frequency rate to current detection is acquired, and carries out root-mean-square valve calculating to the voltage signal of collection
Obtain r.m.s. sequence；
Fourier transformation is carried out to the r.m.s. sequence according to dynamic vector method, dynamic vector is obtained；
The dynamic vector is brought into preset formula and calculated, the corresponding voltage pulsation of the amplitude modulation wave frequency rate is obtained
Value.
5. method according to claim 4, it is characterised in that the voltage signal to many amplitude modulation wave frequency rates is examined
Survey, obtain the voltage signal of many amplitude modulation wave frequency rates, the voltage signal of many amplitude modulation wave frequency rates is analyzed according to dynamic vector method
The step of calculating, magnitude of a voltage fluctuation for obtaining many amplitude modulation wave frequency rates, includes：
The voltage signal of many amplitude modulation wave frequency rates is gathered, conversion is modulated to the voltage signal of many amplitude modulation wave frequency rates of collection, and
Root-mean-square valve is carried out to the voltage signal converted through ovennodulation and calculates the r.m.s. sequence for obtaining many amplitude modulation wave frequency rates；
Calculating processing is carried out to the r.m.s. sequence of many amplitude modulation wave frequency rates according to dynamic vector method, many amplitude modulation wave frequency rates are obtained
Magnitude of a voltage fluctuation.
6. method according to claim 1 or 5, it is characterised in that described according to amplitude modulation wave frequency rate and magnitude of a voltage fluctuation
The table of comparisons carries out calculating processing to the magnitude of a voltage fluctuation of many amplitude modulation wave frequency rates, and the step of obtaining voltage flicker testing result includes：
The magnitude of a voltage fluctuation of many amplitude modulation wave frequency rates is calculated according to the table of comparisons of amplitude modulation wave frequency rate and magnitude of a voltage fluctuation, obtained
The corresponding instantaneous flicker value of each amplitude modulation wave frequency rate；
Multiple instantaneous flicker values are summed, root calculating is opened, Short Term Flicker value is obtained.
7. method according to claim 6, it is characterised in that the compareing according to amplitude modulation wave frequency rate and magnitude of a voltage fluctuation
Table is calculated the magnitude of a voltage fluctuation progress of many amplitude modulation wave frequency rates, the step of obtaining each amplitude modulation wave frequency rate corresponding instantaneous flicker value
Including：
The table of comparisons of amplitude modulation wave frequency rate and magnitude of a voltage fluctuation is inquired about, the corresponding magnitude of a voltage fluctuation of each amplitude modulation wave frequency rate is obtained；
The magnitude of a voltage fluctuation for inquiring about obtained each magnitude of a voltage fluctuation and many amplitude modulation wave frequency rates is brought into default flickering value formula
It is middle to be calculated, obtain corresponding instantaneous flicker value.
8. a kind of voltage flicker detection means, applied to digital flicker detection instrument, it is characterised in that the digital flickering inspection
The table of comparisons that amplitude modulation wave frequency rate and magnitude of a voltage fluctuation are preserved in instrument is surveyed, described device includes：
Computing module is detected, is detected for the voltage signal to many amplitude modulation wave frequency rates, obtains the voltage of many amplitude modulation wave frequency rates
Signal, carries out analysis calculating to the voltage signal of many amplitude modulation wave frequency rates according to dynamic vector method, obtains the electricity of many amplitude modulation wave frequency rates
Press undulating value；
Processing module is calculated, for the table of comparisons according to the amplitude modulation wave frequency rate and magnitude of a voltage fluctuation to many amplitude modulation wave frequency rates
Magnitude of a voltage fluctuation carry out calculating processing, obtain voltage flicker testing result.
9. device according to claim 8, it is characterised in that：
The detection computing module, is additionally operable to detect the voltage signal of multiple different single amplitude modulation wave frequency rates, obtains
Corresponding voltage signal, carries out analysis calculating to voltage signal according to dynamic vector method, obtains amplitude modulation wave frequency rate and voltage pulsation
The table of comparisons of value.
10. device according to claim 8, it is characterised in that the calculating processing module is according to amplitude modulation wave frequency rate and electricity
Press the table of comparisons of undulating value to carry out calculating processing to the magnitude of a voltage fluctuation of many amplitude modulation wave frequency rates, obtain voltage flicker testing result
Mode includes：
The magnitude of a voltage fluctuation of many amplitude modulation wave frequency rates is calculated according to the table of comparisons of amplitude modulation wave frequency rate and magnitude of a voltage fluctuation, obtained
The corresponding instantaneous flicker value of each amplitude modulation wave frequency rate；
Multiple instantaneous flicker values are summed, root calculating is opened, Short Term Flicker value is obtained.
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