CN108519512A - Method and system for high-precision harmonic measure - Google Patents
Method and system for high-precision harmonic measure Download PDFInfo
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- CN108519512A CN108519512A CN201810247819.6A CN201810247819A CN108519512A CN 108519512 A CN108519512 A CN 108519512A CN 201810247819 A CN201810247819 A CN 201810247819A CN 108519512 A CN108519512 A CN 108519512A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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- G01R23/16—Spectrum analysis; Fourier analysis
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Abstract
The invention discloses a kind of method and systems for high-precision harmonic measure.The method and system for being used for high-precision harmonic measure writes the voltage signal that the high-precision fundamental wave of harmonic measure software simulation output is superimposed harmonic wave by NI Labview Software Development Platforms, and the harmonic component in the voltage signal is used to calibrate the harmonic amplitude parameter of tested harmonic source, solve the problems, such as that the harmonic measure precision of existing harmonic source is low.
Description
Technical field
The present invention relates to suitable for voltage and current harmonic measure a kind of method for high-precision harmonic measure and be
System.
Background technology
With the development of society, the utilization of new instrument new technology, the overtone order of many harmonic source outputs has reached 100
It is secondary, and the precision of harmonic wave is high (reaching ± 0.0451% × reading).
The voltage harmonic measurement range of current harmonic source is 60V~500V, and highest harmonic measure number is 60 times, is measured
Opposite expanded uncertainty is ± 0.04%, at this time Coverage factor k=2；Current harmonics measurement range is 0.005A~100A, most
Higher harmonics pendulous frequency is 60 times, and it is ± 0.04% to measure opposite expanded uncertainty, at this time Coverage factor k=2.
For example, the method that FLUKE 6105A harmonic sources are traced to the source at present：Utilize adopting for Agilent 3458A digital multimeters
Sample function writes harmonic analysis software as measurement standard, directly measures harmonic wave and carries out transmission of quantity value, measurement accuracy mainly by
Agilent 3458A digital multimeter sampling functions measurement accuracy determines that the horizontal higher correcting mechanism of domestic technique uses this
After kind scheme, measuring opposite expanded uncertainty is：0.04% (k=2), with FLUKE 6105A harmonic source output harmonic wave width
The limits of error ± 0.0451% of value is close, TUR=0.88>1/3, it is unsatisfactory for FLUKE 6105A harmonic source output harmonic waves
The requirement of tracing to the source of amplitude.
The measurement accuracy of current harmonic source can no longer meet the requirement of tracing to the source of current harmonic wave, can not trace to the source to alternating current
Press parameter.The measurement accuracy of current harmonic source is mainly determined by the measurement accuracy of digital multimeter sampling functions.Current harmonic wave
The Measurement architecture in source has fettered the promotion of harmonic measure precision, causes harmonic measure precision low.
Invention content
The embodiment of the present invention provides a kind of method and system for high-precision harmonic measure, to solve current harmonic source
The low problem of harmonic measure precision.
In a first aspect, the embodiment of the present invention provides a kind of method for high-precision harmonic measure, include the following steps：
Initialization is tested the parameter of harmonic source, so that tested harmonic source is exported a tested initial signal, parameter includes fundamental wave width
Value parameter, fundamental frequency parameter, harmonic amplitude parameter and harmonic wave count parameter；
According to the fundamental frequency parameter, harmonic amplitude parameter and harmonic wave count parameter of tested harmonic source, Multi-functional standard is set
Source makes Multifunctional standard source automatic export a second harmonic voltage signal；
It is sampled using digitizer and is tested initial signal and second harmonic voltage signal, be converted into digitized tested initial
Signal and digitized second harmonic voltage signal；
Sine wave module is given birth to according to fundamental voltage amplitude parameter and fundamental frequency parameter simulation in Usage data collection processing system
At a second fundamental wave voltage signal；
Digitized second harmonic voltage signal is added with second fundamental wave voltage signal and generates fundamental wave superposition harmonic wave electricity
Press signal；
The first harmonic amplitude of digitized tested initial signal is measured using transition harmonic measure software；N times are repeated, are obtained
Obtain the arithmetic mean of instantaneous value of the n times measured value of a first harmonic amplitude；
The second harmonic amplitude that fundamental wave is superimposed harmonic voltage signal is measured using transition harmonic measure software；N times are repeated, are obtained
Obtain the arithmetic mean of instantaneous value of the n times measured value of a second harmonic amplitude；
According to the arithmetic mean of instantaneous value of the n times measured value of first harmonic amplitude, the arithmetic of the n times measured value of second harmonic amplitude
On average value, Multifunctional standard source automatic on the indicated value of voltage magnitude and tested harmonic source first harmonic amplitude indicated value, calculate
The error of indication of tested harmonic source output first harmonic amplitude；
The expanded uncertainty of measurement result is evaluated according to the error of indication.
Second aspect, the embodiment of the present invention provide a kind of system for high-precision harmonic measure, including：
Tested harmonic source is used for initiation parameter, and exports a tested initial signal, parameter include fundamental voltage amplitude parameter,
Fundamental frequency parameter, harmonic amplitude parameter and harmonic wave count parameter；
Multifunctional standard source automatic, for according to fundamental frequency parameter, harmonic amplitude parameter and the overtone order for being tested harmonic source
Parameter makes Multifunctional standard source automatic export a second harmonic voltage signal；
Current-to-voltage convertor, the tested initial signal conversion for exporting tested harmonic source in the form of current signal
To be exported in the form of voltage signal；
Data acquisition processing system is converted into digitlization for sampling tested initial signal and second harmonic voltage signal
Tested initial signal and digitized second harmonic voltage signal；
A second fundamental wave voltage signal is generated according to fundamental voltage amplitude parameter and the simulation of fundamental frequency value parameter；
Digitized second harmonic voltage signal is added with second fundamental wave voltage signal and generates fundamental wave superposition harmonic wave electricity
Press signal；
Transition harmonic measure software measures the first harmonic amplitude of digitized tested initial signal；N times are repeated, obtain one
The arithmetic mean of instantaneous value of the n times measured value of first harmonic amplitude；
Transition harmonic measure software measures the second harmonic amplitude of fundamental wave superposition harmonic voltage signal；N times are repeated, obtain one
The arithmetic mean of instantaneous value of the n times measured value of second harmonic amplitude；
According to the arithmetic mean of instantaneous value of the n times measured value of first harmonic amplitude, the arithmetic of the n times measured value of second harmonic amplitude
The indicated value of average value and Multifunctional standard source automatic output voltage amplitude calculates the indicating value for being tested harmonic source output first harmonic amplitude
Error；
The expanded uncertainty of measurement result is evaluated according to the error of indication.
The embodiment of the present invention has the following advantages that compared with prior art：One kind that the embodiment of the present invention is provided is for height
The method and system of precision harmonic measure.The method and system for being used for high-precision harmonic measure is opened by NI Labview softwares
Hair platform writes the voltage signal of the high-precision fundamental wave superposition harmonic wave of harmonic measure software simulation output, and will be in the voltage signal
Harmonic component be used to calibrate the harmonic amplitude parameter of tested harmonic source, the harmonic measure precision for solving existing harmonic source is low
Problem.
Description of the drawings
In order to illustrate the technical solution of the embodiments of the present invention more clearly, below by institute in the description to the embodiment of the present invention
Attached drawing to be used is needed to be briefly described, it should be apparent that, the accompanying drawings in the following description is only some implementations of the present invention
Example, for those of ordinary skill in the art, without creative efforts, can also obtain according to these attached drawings
Obtain other attached drawings.
Fig. 1 is the implementation flow chart for the method for high-precision harmonic measure that the embodiment of the present invention 1 provides.
Fig. 2 is the specific implementation stream of step S10 in the method for high-precision harmonic measure that the embodiment of the present invention 1 provides
Cheng Tu.
Fig. 3 is the specific implementation stream of step S80 in the method for high-precision harmonic measure that the embodiment of the present invention 1 provides
Cheng Tu.
Fig. 4 is the schematic diagram for the system for high-precision harmonic measure that the embodiment of the present invention 2 provides.
Fig. 5 is the installation drawing for the system for high-precision harmonic measure that the embodiment of the present invention 2 provides.
Specific implementation mode
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation describes, it is clear that described embodiments are some of the embodiments of the present invention, instead of all the embodiments.Based on this hair
Embodiment in bright, the every other implementation that those of ordinary skill in the art are obtained without creative efforts
Example, shall fall within the protection scope of the present invention.
Embodiment 1
Referring to Fig. 1, Fig. 1 shows a kind of method for high-precision harmonic measure provided in the embodiment of the present invention
Implementation flow chart.This method is superimposed the voltage signal of harmonic wave by the high-precision fundamental wave of software simulation output, and the voltage is believed
Harmonic component in number is used to calibrate the harmonic amplitude parameter of tested harmonic source, improves the precision of harmonic source harmonic measure.It should
Details are as follows by the execution step S10-S90 of method：
S10：Initialization is tested the parameter of harmonic source, so that tested harmonic source is exported a tested initial signal, parameter includes base
Wave amplitude value parameter, fundamental frequency parameter, harmonic amplitude parameter and harmonic wave count parameter.
Further, it is that the tested harmonic source of setting exports the fundamental wave for being tested initial signal to initialize and be tested the parameter of harmonic source
The fundamental voltage amplitude value of magnitude parameters, the fundamental frequency value of fundamental frequency parameter, the harmonic amplitude value of harmonic amplitude parameter
With the overtone order value of harmonic wave count parameter.For example, when tested harmonic source is FLUKE 6105A harmonic sources, can be arranged
The fundamental voltage amplitude parameter, fundamental frequency parameter, harmonic amplitude parameter that the output of FLUKE 6105A harmonic sources is tested initial signal are harmonious
The value of wave count parameter is respectively A, f, arefAnd n, wherein n are the integer more than or equal to 2.
Further, tested harmonic source can be arbitrary harmonic source.For example, tested harmonic source is that FLUKE 6105A are humorous
Wave source.
Further, it is to join according to fundamental voltage amplitude parameter, fundamental frequency so that tested harmonic source is exported a tested initial signal
The value of number, harmonic amplitude parameter and harmonic wave count parameter adjusts the rotary switch for being tested harmonic source relevant parameter, makes tested humorous
Wave source exports first base corresponding with fundamental voltage amplitude value, fundamental frequency value, harmonic amplitude value and overtone order value
Wave is superimposed the voltage signal or current signal of first harmonic.
Further, it is the voltage signal or current signal that first fundamental wave is superimposed first harmonic to be tested initial signal.For example,
If tested harmonic source is FLUKE 6105A harmonic sources, setting FLUKE 6105A harmonic sources export the fundamental wave width for being tested initial signal
Value parameter, fundamental frequency parameter, the value of harmonic amplitude parameter and harmonic wave count parameter are respectively A, f, arefAnd n, it can calculate
Go out the output expression formula y of the first fundamental wave signal of tested initial signalref1, first harmonic signal output expression formula yref2And quilt
Survey initial signal yrefOutput expression formula.Wherein, the output expression formula y of first fundamental wave signalref1, first harmonic signal it is defeated
Go out expression formula yref2With tested initial signal yrefOutput expression formula as shown in (1), (2) and (3).
yref12 π ft (1) of=A × sin
yref2=aref×sin 2πnft (2)
yref=yref1+yref2 (3)
Further, the value of overtone order parameter is the integer more than or equal to 2.
Further, when the value of overtone order parameter is n, the harmonic signal for being tested harmonic source output is n-th harmonic
Signal.For example, the value of overtone order parameter is n=3, then the harmonic signal for being tested harmonic source output is the 3rd rd harmonic signal.
The harmonic signal of tested harmonic source output includes harmonic voltage signal harmony signal wave current, and harmonic voltage signal is first fundamental wave
It is superimposed the voltage signal of first harmonic, harmonic current signal is the current signal that first fundamental wave is superimposed first harmonic.
Further, tested harmonic source can be arbitrary harmonic source.For example, tested harmonic source is that FLUKE 6105A are humorous
Wave source.
S20：It is arranged according to the fundamental frequency parameter, harmonic amplitude parameter and harmonic wave count parameter of tested harmonic source multi-functional
Standard source makes Multifunctional standard source automatic export a second harmonic voltage signal.
Further, Multifunctional standard source automatic can be arbitrary Multifunctional standard source automatic.For example, Multifunctional standard source automatic is
FLUKE 5730A Multifunctional standard source automatics.
Further, taking according to the fundamental frequency parameter of tested harmonic source, harmonic amplitude parameter and harmonic wave count parameter
Value makes Multifunctional standard source automatic simulation output be tested in the voltage signal of first fundamental wave superposition first harmonic of harmonic source output
First harmonic voltage signal obtains a second harmonic voltage signal.Institute in the output expression formula of second harmonic voltage signal such as (4)
Show.
Second harmonic voltage signal=aref×sin 2πnft (4)
If for example, being tested the fundamental frequency parameter of harmonic source, harmonic amplitude parameter and harmonic wave count parameter in step S10
Value is respectively f, arrfAnd n, make one that Multifunctional standard source automatic FLUKE 5730A simulation output harmonic source FLUKE 6105A are exported
First fundamental wave is superimposed the first harmonic voltage signal in the voltage signal of first harmonic, obtains a second harmonic voltage signal
y'ref2.Second harmonic voltage signal y'ref2Output expression formula such as shown in (5).
y'ref2=aref×sin 2πnft (5)
S30：It is sampled using digitizer and is tested initial signal and second harmonic voltage signal, be converted into digitized tested
Initial signal and digitized second harmonic voltage signal.
Further, digitizer can be it is arbitrary can realize the analog voltage signal of input is converted to it is digitized
The instrument of voltage signal output.For example, digitizer is NI PXIe-4081 digitizers.
For example, if digitizer is NI PXIe-4081 digitizers, NI PXIe-4081 digitizers samplings can be used
Second harmonic voltage signal y'ref2Into data acquisition processing system, it is converted into digitized second harmonic voltage signal y "ref2。
S40：Sine wave module is according to fundamental voltage amplitude parameter and fundamental frequency parameter mould in Usage data collection processing system
It is quasi- to generate a second fundamental wave voltage signal.
For example, the running environment of data acquisition processing system can be：In NI PXIe-1062Q cabinets, load respectively
NI PXIe-8135 controllers and NI PXIe-4081 digitizers, constitute the hardware of data acquisition processing system.NI PXIe-
7 operating systems of Windows are installed in 8135 controllers, NI Labview softwares are installed in 7 operating systems of Windows,
Transition harmonic measure software is write based on discrete Fourier transform in NI Labview Software Development Platforms, in NI Labview
Call sine wave module that can generate a second fundamental wave voltage signal in Software Development Platform.
Further, sine wave module is a software module for generating second fundamental wave voltage signal, which is based on
NI Labview Software Development Platforms are developed.The function of sine wave module is to be joined according to the fundamental voltage amplitude of the sine wave module of input
Number and fundamental frequency parameter, simulation output are believed just like digitized second fundamental wave voltage defined in fundamental voltage amplitude and fundamental frequency
Number.The technology arrived used in sine wave module is the known technology in metering field.
Further, second fundamental wave voltage signal is digitized second fundamental wave voltage signal.
For example, if the value of fundamental voltage amplitude parameter, fundamental frequency parameter is respectively A and f, in data acquisition processing system
NI Labview Software Development Platforms in call sinewave output module, digitized second fundamental wave voltage signal can be exported
yref1, yref1Output expression formula such as shown in (6).
yref12 π ft (6) of=A × sin
S50：Digitized second harmonic voltage signal is added with second fundamental wave voltage signal to generate fundamental wave superposition humorous
Wave voltage signal.
Further, software is write in NI Labview Software Development Platforms makes a digitized second harmonic voltage letter
Number with a second fundamental wave voltage signal additional combining can be obtained a fundamental wave be superimposed harmonic voltage signal.
For example, digitized second harmonic voltage signal is y "ref2, second fundamental wave voltage signal is yref1, then in NI
Software is write in Labview Software Development Platforms makes a digitized second harmonic voltage signal and a second fundamental wave voltage signal
Fundamental wave superposition harmonic voltage signal y' can be obtained in additional combiningref.Fundamental wave is superimposed harmonic voltage signal y'refOutput expression formula
As shown in (7).
y'ref=yref1+y”ref2 (7)
S60：The first harmonic amplitude of digitized tested initial signal is measured using transition harmonic measure software；Repeat N
It is secondary, obtain the arithmetic mean of instantaneous value of the n times measured value of a first harmonic amplitude.
Further, technology used in transition harmonic measure software is techniques known.Transition harmonic measure
The operation principle of software is briefly described below：Transition harmonic measure software is in NI Labview Software Development Platforms based on fast
Fast Fourier Transform Algorithm exploitation carries out harmonic wave point to the tested initial signal and fundamental wave of input superposition harmonic voltage signal respectively
Analysis, fundamental voltage amplitude, fundamental frequency and each harmonic amplitude of measuring signal.Transition harmonic measure software is for measuring input transition
The each harmonic amplitude of the digitized voltage signal of harmonic measure software.For example, if tested initial signal is yref, then can be with
It is measured by transition harmonic measure software and is tested initial signal yrefAnd obtain tested initial signal yrefFirst harmonic amplitude
Value is aref。
Further, tested initial signal enters data acquisition processing system, is converted by digitizer digitized
Tested initial signal, digitized tested initial signal enters back into transition harmonic measure software, soft by transition harmonic measure
Part measures digitized tested initial signal and obtains first harmonic amplitude.Wherein, the quilt in data acquisition processing system is entered
Survey initial signal is a voltage signal.Using transition harmonic measure software to digitized tested initial signal duplicate measurements n times,
Obtain the arithmetic mean of instantaneous value of the n times measured value of the first harmonic amplitude of digitized tested initial signal.For example, as N=10,
Even if with transition harmonic measure software to digitized tested initial signal duplicate measurements 10 times.If measuring digitized quilt every time
It is a to survey the first harmonic amplitude value that initial signal obtains0-i10 first harmonic amplitudes then can be obtained in (i=1 ..., 10)
a0-iThe average value of (i=1 ..., 10) isThe average value of first harmonic amplitudeCalculation formula expression formula such as in (8)
It is shown.
Further, N is the integer more than or equal to 10.
S70：The second harmonic amplitude that fundamental wave is superimposed harmonic voltage signal is measured using transition harmonic measure software；Repeat N
It is secondary, obtain the arithmetic mean of instantaneous value of the n times measured value of a second harmonic amplitude.
Further, fundamental wave superposition harmonic voltage signal enters in transition harmonic measure software, by transition harmonic measure
Software measures fundamental wave superposition harmonic voltage signal and obtains second harmonic amplitude.
For example, the transition harmonic measure software in Usage data collection processing system, which measures fundamental wave, is superimposed harmonic voltage signal
y′ref, fundamental wave superposition harmonic voltage signal y ' can be obtainedrefSecond harmonic amplitude value be a1。
Further, N is the integer more than or equal to 10.
For example, as N=10, even if humorous with the second of transition harmonic measure software measurement fundamental wave superposition harmonic voltage signal
Wave amplitude 10 times.If measuring the second harmonic width that fundamental wave superposition harmonic voltage signal obtains using transition harmonic measure software every time
The value of value is a1-iThe value a of the second harmonic amplitude of 10 measurements then can be obtained in (i=1 ..., 10)1-i(i=1 ...,
10) average value isThe average value of the value of second harmonic amplitudeCalculation formula expression formula as shown in (9).
S80：According to the arithmetic mean of instantaneous value of the n times measured value of first harmonic amplitude, the n times measured value of second harmonic amplitude
On arithmetic mean of instantaneous value, Multifunctional standard source automatic on the indicated value of voltage magnitude and tested harmonic source first harmonic amplitude indicated value,
Calculate the error of indication for being tested harmonic source output first harmonic amplitude.
Further, the indicated value of voltage magnitude is folded according to harmonic source output first fundamental wave is tested on Multifunctional standard source automatic
Add the harmonic amplitude of the harmonic amplitude parameter of the voltage signal of first harmonic or the harmonic wave width of the harmonic amplitude parameter of current signal
The indicated value of the harmonic amplitude of Multifunctional standard source automatic is arranged in value, the resistance value of current-to-voltage convertor.
Further, it is surveyed according to the n times of the arithmetic mean of instantaneous value of the n times measured value of first harmonic amplitude, second harmonic amplitude
The indicated value of voltage magnitude on the arithmetic mean of instantaneous value and Multifunctional standard source automatic of magnitude calculates and is tested harmonic source output first harmonic width
The calculating process of the error of indication of value includes following two step：
The first step calculates the harmonic amplitude actual value for being tested harmonic source output.Wherein, it is tested the harmonic wave width of harmonic source output
It is worth the arithmetic mean of instantaneous value-of the n times measured value of indicated value+first harmonic amplitude of voltage magnitude on actual value=Multifunctional standard source automatic
The arithmetic mean of instantaneous value of the n times measured value of second harmonic amplitude.
Second step calculates the error of indication for being tested harmonic source output harmonic wave amplitude.Wherein, it is tested harmonic source output harmonic wave width
The indicated value-of first harmonic amplitude is tested the harmonic amplitude reality of harmonic source output on the error of indication of value=tested harmonic source
Value.
For example, the harmonic amplitude actual value of tested FLUKE 6105A harmonic sources output is Wherein, arefFor the indicated value of Multifunctional standard source automatic output voltage amplitude,It is measured for the n times of first harmonic amplitude
The arithmetic mean of instantaneous value of value,For the arithmetic mean of instantaneous value of the n times measured value of second harmonic amplitude.If tested FLUKE 6105A are humorous
The harmonic amplitude indicating value of wave source output is ax, then the error of indication for the FLUKE 6105A harmonic source output harmonic wave amplitudes being tested
The expression formula of calculation formula is as shown in (10).
S90：The expanded uncertainty of measurement result is evaluated according to the error of indication.
Further, the expanded uncertainty of measurement result is the non-negative parameter that characterization is measured magnitude dispersibility.
Further, if the expanded uncertainty of measurement result is expressed as U, the expanded uncertainty U's of measurement result
The expression formula of calculation formula is as shown in (11) and (12).
U=k × uc (11)
Further, k is Coverage factor, as acquires expanded uncertainty, is multiplied to combined standard uncertainty
Numerical factor.ucFor combined standard uncertainty, combined standard uncertainty is known technology in industry.In normal distribution situation
Under, different fiducial probability p correspond to different Coverage factor k.For example, p=68.27%, k=1；P=95.45%, k=2；P=
99.73%, k=3.
Further, the standard uncertainty u in formula (12)1(a0)、u2(a1)、u3(aref) calculation formula table
Up to formula as shown in (13), (14) and (15).
According to y'ref2Consult the alternating voltage technical indicator of FLUKE 5730A Multifunctional standard source automatics, the maximum in one year
Allowable error is:± (B × reading+C), confidence level 95% takes Coverage factor k=2, then standard uncertainty u3(aref)
Calculation formula expression formula as shown in (15).
Referring to Fig. 2, step in the method for high-precision harmonic measure provided Fig. 2 shows the embodiment of the present invention 1
The specific implementation flow chart of S10.This specifically includes step S110- steps for step S10 in the method for high-precision harmonic measure
S130, details are as follows：
S110：Initialization is tested the parameter of harmonic source, and tested harmonic source is made to export first fundamental wave superposition first harmonic
Voltage signal.
Further, it is harmonious that the fundamental voltage amplitude parameter for being tested harmonic source, fundamental frequency parameter, harmonic amplitude parameter are initialized
Wave count parameter makes the voltage signal of tested harmonic source output first fundamental wave superposition first harmonic.For example, initialization is tested harmonic wave
The fundamental voltage amplitude parameter of source FLUKE 6105A, fundamental frequency parameter, the value of harmonic amplitude parameter and harmonic wave count parameter be A,
f、arefAnd n, so that tested harmonic source is exported the voltage signal of first fundamental wave superposition first harmonic.
S120：Initialization is tested the parameter of harmonic source, and tested harmonic source is made to export first fundamental wave superposition first harmonic
Current signal, and the current signal input current electric pressure converter of first fundamental wave superposition first harmonic is converted into first fundamental wave and is folded
Add the voltage signal of first harmonic.
Further, it is harmonious that the fundamental voltage amplitude parameter for being tested harmonic source, fundamental frequency parameter, harmonic amplitude parameter are initialized
Wave count parameter makes tested harmonic source export the current signal of first fundamental wave superposition first harmonic, and first fundamental wave is superimposed
The current signal input current electric pressure converter of first harmonic is converted to the voltage signal of first fundamental wave superposition first harmonic.Example
Such as, fundamental voltage amplitude parameter, fundamental frequency parameter, harmonic amplitude parameter and the harmonic wave for being tested harmonic source FLUKE 6105A are initialized
The value of count parameter is A, f, arefAnd n, so that tested harmonic source is exported the current signal of first fundamental wave superposition first harmonic,
And the current signal input TH0400 precision current dividers that first fundamental wave is superimposed to first harmonic are converted to first fundamental wave superposition first
The voltage signal of harmonic wave.
Further, current-to-voltage convertor can be arbitrary current-to-voltage convertor, as long as can realize input
Current signal is converted to corresponding voltage signal.For example, current-to-voltage convertor is TH0400 precision current dividers.
S130：First fundamental wave is superimposed the voltage signal of first harmonic as tested initial signal.
For example, if the voltage signal of the first fundamental wave superposition first harmonic obtained in step 110 and step 120 is yref, then
By yrefAs tested initial signal.
Referring to Fig. 3, Fig. 3 shows step in the method for high-precision harmonic measure that the embodiment of the present invention 1 provides
The specific implementation flow chart of S80.This specifically includes step S810- steps for step S80 in the method for high-precision harmonic measure
S820, details are as follows：
S810：The first harmonic amplitude actual value for being tested harmonic source output is calculated, the first harmonic of harmonic source output is tested
The arithmetic average of the n times measured value of the indicated value of voltage magnitude+first harmonic amplitude on amplitude actual value=Multifunctional standard source automatic
The arithmetic mean of instantaneous value of the n times measured value of value-second harmonic amplitude.
Further, the calculation formula for being tested the first harmonic amplitude actual value of harmonic source output is the public affairs in metering field
Know technology.
Further, the indicated value of voltage magnitude is with reference to the harmonic amplitude parameter for being tested harmonic source on Multifunctional standard source automatic
Harmonic amplitude setting value be arranged.For example, the harmonic amplitude setting value of the harmonic amplitude parameter of tested harmonic source is aref,
The indicated value that voltage magnitude on Multifunctional standard source automatic can then be arranged is aref。
For example, if tested harmonic source is FLUKE 6105A harmonic sources, if the instruction of Multifunctional standard source automatic output voltage amplitude
Value is aref, the arithmetic mean of instantaneous value of the n times measured value of first harmonic amplitude isThe arithmetic of the n times measured value of second harmonic amplitude
Average value isThen the harmonic amplitude actual value of FLUKE 6105A harmonic sources output is
S820：It is tested the error of indication that harmonic source exports first harmonic amplitude according to first harmonic amplitude calculated with actual values,
The indicated value-of first harmonic amplitude is tested humorous on the error of indication of tested harmonic source output first harmonic amplitude=tested harmonic source
The first harmonic amplitude actual value of wave source output.
Further, the calculation formula for being tested the error of indication of harmonic source output first harmonic amplitude is in metering field
Known technology.
Further, the indicated value for being tested first harmonic amplitude on harmonic source is the setting according to first harmonic magnitude parameters
Value is come the indicated value on the tested harmonic source that is arranged.For example, if tested harmonic source is FLUKE 6105A harmonic sources, FLUKE
The setting value of the first harmonic magnitude parameters of 6105A harmonic sources is ax, then first harmonic width on FLUKE 6105A harmonic sources is understood
The indicated value of value is ax。
For example, if the first harmonic amplitude indicating value of tested FLUKE 6105A harmonic sources output is ax, then it is tested
FLUKE 6105A harmonic sources export the expression formula of the calculation formula of the error of indication of first harmonic amplitude as shown in (16).
The method for being used for high-precision harmonic measure writes harmonic measure software by NI Labview Software Development Platforms
The voltage signal of the high-precision fundamental wave superposition harmonic wave of simulation output, and the harmonic component in the voltage signal is tested for calibrating
The harmonic amplitude parameter of harmonic source solves the problems, such as that the harmonic measure precision of existing harmonic source is low.
Embodiment 2
The embodiment of the present invention provides a kind of system 10 for high-precision harmonic measure, including：
Tested harmonic source 20 is used for initiation parameter, and exports a tested initial signal, and parameter includes fundamental voltage amplitude ginseng
Number, fundamental frequency parameter, harmonic amplitude parameter and harmonic wave count parameter.
Multifunctional standard source automatic 30, for according to the fundamental frequency parameter, harmonic amplitude parameter and harmonic wave time for being tested harmonic source
Number parameter, makes Multifunctional standard source automatic export a second harmonic voltage signal.
Current-to-voltage convertor 40, the tested initial signal for exporting tested harmonic source in the form of current signal turn
It turns to and is exported in the form of voltage signal.
Data acquisition processing system 50 is converted into number for sampling tested initial signal and second harmonic voltage signal
The tested initial signal changed and digitized second harmonic voltage signal.Data acquisition processing system 50 includes digital module
510, controller module 520, sine wave module 530, fundamental wave superposition harmonic generation module 540, harmonic measure module 550 and calculating
Processing module 560, wherein calculation processing module 560 are shown including harmonic amplitude arithmetic mean of instantaneous value computing module 5610, harmonic amplitude
It is worth error calculating module 5620 and harmonic amplitude uncertainty calculation module 5630, harmonic amplitude error of indication computing module 5620
Including first harmonic amplitude calculated with actual values module 56210 and first harmonic amplitude error of indication computing module 56220.
Digital module 510, for the analog signal for inputting digital module 510 to be converted to digital signal.For example, number
Word module 510 can be a digitizer, be specifically NI PXIe-4081 digitizers.
Controller module 520 is used for installation operation system.For example, controller module 520 is NI PXIe-8135 controls
Device is mounted with 7 operating systems of Windows in NI PXIe-8135 controllers, it is soft to be equipped with NI Labview in an operating system
Part calls software module sine wave module 530 in NI Labview softwares, software fundamental wave is write in NI Labview softwares
It is superimposed harmonic generation module 540, software harmonic measure module 550 is write based on discrete Fourier transform, is constituted at data acquisition
Manage system software.
Sine wave module 530, for generating a second fundamental wave according to fundamental voltage amplitude parameter and the simulation of fundamental frequency value parameter
Voltage signal.Sine wave module 530 is the software module that can be directly invoked in NI Labview softwares.
Fundamental wave is superimposed harmonic generation module 540, is used for digitized second harmonic voltage signal and second fundamental wave voltage
Signal, which is added, generates fundamental wave superposition harmonic voltage signal.Fundamental wave is superimposed harmonic generation module 540 as in NI Labview softwares
In the software write.
Harmonic measure module 550, the first harmonic amplitude for measuring digitized tested initial signal and fundamental wave superposition
The second harmonic amplitude of harmonic voltage signal.Harmonic measure module 550 is based on discrete Fourier transform in NI Labview for one
The transition harmonic measure software that Software Development Platform is write.Technology used in transition harmonic measure software is the known of this field
Technology.The operation principle of transition harmonic measure software is briefly described below：Transition harmonic measure software is soft in NI Labview
It is developed based on discrete fourier transform algorithm in part development platform, harmonic wave is superimposed to the tested initial signal and fundamental wave of input respectively
Voltage signal carries out frequency analysis, fundamental voltage amplitude, fundamental frequency and each harmonic amplitude of measuring signal.Transition harmonic measure is soft
Part is used to measure each harmonic amplitude of the digitized voltage signal of input transition harmonic measure software.If for example, tested first
Beginning signal is yref, then can be measured by transition harmonic measure software and be tested initial signal yrefAnd obtain tested initial signal
yrefFirst harmonic amplitude value be aref。
Calculation processing module 560, the arithmetic mean of instantaneous value of the n times measured value for calculating first harmonic amplitude calculate second
The arithmetic mean of instantaneous value of the n times measured value of harmonic amplitude calculates the error of indication and root for being tested harmonic source output first harmonic amplitude
The expanded uncertainty of measurement result is evaluated according to the error of indication.
Harmonic amplitude arithmetic mean of instantaneous value computing module 5610, for repeating n times, the n times for obtaining a first harmonic amplitude are surveyed
The arithmetic mean of instantaneous value of magnitude or for repeating n times, obtains the arithmetic mean of instantaneous value of the n times measured value of a second harmonic amplitude.
Harmonic amplitude error of indication computing module 5620, the arithmetic for the n times measured value according to first harmonic amplitude are flat
The indicated value of voltage magnitude and tested on the arithmetic mean of instantaneous value of the n times measured value of mean value, second harmonic amplitude, Multifunctional standard source automatic
The indicated value of first harmonic amplitude on harmonic source calculates the error of indication for being tested harmonic source output first harmonic amplitude.
Harmonic amplitude error of indication computing module 5620 includes first harmonic amplitude calculated with actual values module 56210 and first
Harmonic amplitude error of indication computing module 56220.
First harmonic amplitude calculated with actual values module 56210 is used for the arithmetic of the n times measured value according to first harmonic amplitude
Average value, second harmonic amplitude n times measured value arithmetic mean of instantaneous value and Multifunctional standard source automatic on voltage magnitude indicated value meter
Calculate the first harmonic amplitude actual value for being tested harmonic source output.The calculating of the first harmonic amplitude actual value of tested harmonic source output
Formula as defined below：The finger of voltage magnitude on first harmonic amplitude actual value=Multifunctional standard source automatic of tested harmonic source output
The arithmetic mean of instantaneous value of the n times measured value of the arithmetic mean of instantaneous value of the n times measured value of indicating value+first harmonic amplitude-second harmonic amplitude.
First harmonic amplitude error of indication computing module 56220, for tested according to first harmonic amplitude calculated with actual values
Harmonic source exports the error of indication of first harmonic amplitude.The calculating of the error of indication of tested harmonic source output first harmonic amplitude is public
Formula as defined below：First harmonic amplitude on the error of indication of tested harmonic source output first harmonic amplitude=tested harmonic source
Indicated value-is tested the first harmonic amplitude actual value of harmonic source output.
Harmonic amplitude uncertainty calculation module 5630, the extension for evaluating measurement result according to the error of indication are uncertain
Degree.
The calculating process of expanded uncertainty for the measurement result in the system of high-precision harmonic measure and embodiment 1
The method for high-precision harmonic measure in measurement result expanded uncertainty calculating process it is completely the same, herein not
It repeats again.
Further, 50 receiving voltage signals of data acquisition processing system are as input.
Further, it can be arbitrary harmonic source to be tested harmonic source 20.For example, tested harmonic source 20 is FLUKE
6105A harmonic sources.
Further, Multifunctional standard source automatic 30 can be arbitrary Multifunctional standard source automatic.For example, Multifunctional standard source automatic 30 is
FLUKE 5730A Multifunctional standard source automatics.
Further, current-to-voltage convertor 40 can be arbitrary current-to-voltage convertor, will input as long as can realize
Current signal be converted to the output of corresponding voltage signal.For example, current-to-voltage convertor 40 shunts for TH0400 precisions
Device.
Further, it if the signal that tested harmonic source 20 exports is current signal, needs to first pass through Current Voltage conversion
The current signal of input is converted to voltage signal output by device 40.For example, if tested harmonic source 20 is FLUKE 6105A harmonic waves
Source, electric pressure converter 40 is TH0400 precision current dividers, and the signal of FLUKE 6105A harmonic sources output is current signal, then
It needs current signal being input in TH0400 precision current dividers and is converted to voltage signal output.
Further, digitizer can be arbitrary digitizer.For example, digitizer is NI PXIe-4081 numbers
Change instrument.
Further, the hardware for being mounted with data acquisition processing system software can be soft to be arbitrarily mounted with NI Labview
The hardware platform of part, a controller and a digitizer.For example, the hardware for being mounted with data acquisition processing system is one
NI PXIe-1062Q cabinets load NI PXIe-8135 controllers and NI PXIe- respectively in NI PXIe-1062Q cabinets
4081 digitizers are mounted with 7 operating systems of Windows in NI PXIe-8135 controllers, in 7 operating systems of Windows
In NI Labview softwares are installed.
Further, data acquisition processing system software can be that the NI Labview in meaning operating system platform in office are soft
The transition harmonic measure software that part is write based on discrete Fourier transform.For example, the operation ring of data acquisition processing system software
Border is：It is mounted with 7 operating systems of Windows in NI PXIe-8135 controllers, is equipped in 7 operating systems of Windows
NI Labview softwares, it is soft in NI Labview Software Development Platforms based on discrete Fourier transform to write transition harmonic measure
Part.
The system for being used for high-precision harmonic measure writes harmonic measure software by NI Labview Software Development Platforms
The voltage signal of the high-precision fundamental wave superposition harmonic wave of simulation output, and the harmonic component in the voltage signal is tested for calibrating
The harmonic amplitude parameter of harmonic source solves the problems, such as that the harmonic measure precision of existing harmonic source is low.
Fig. 5 is the installation drawing for the system for high-precision harmonic measure that the embodiment of the present invention 2 provides.For example, this is used for
The actual device course of work of the system of high-precision harmonic measure can be described as shown in step 1- steps 12：
Step 1：The voltage signal of tested FLUKE 6105A harmonic sources output first fundamental wave superposition first harmonic is set
Fundamental voltage amplitude parameter, fundamental frequency parameter, the value of harmonic amplitude parameter and harmonic wave count parameter be respectively 100V, 50.0Hz,
5V and 10.Wherein, overtone order value is 10 the 10th subharmonic of expression, and harmonic amplitude parameter value is that 5V indicates setting the 10th time
Harmonic amplitude is 5V.Alternatively, the electric current letter of the tested FLUKE 6105A harmonic sources output first fundamental wave superposition first harmonic of setting
Number fundamental voltage amplitude parameter, fundamental frequency parameter, the value of harmonic amplitude parameter and harmonic wave count parameter be respectively 10A,
50.0Hz, 0.5A and 10.Wherein, overtone order value is 10 the 10th subharmonic of expression, and harmonic amplitude parameter value is 0.5A tables
Show that the 10th subharmonic amplitude of setting is 0.5A.
Step 2：It is arranged according to fundamental voltage amplitude setting value, fundamental frequency setting value, harmonic amplitude setting value and overtone order
Value makes tested FLUKE 6105A harmonic sources export the voltage signal of first fundamental wave superposition first harmonic；If tested
FLUKE 6105A harmonic sources export the current signal of first fundamental wave superposition first harmonic, then first fundamental wave is made to be superimposed first harmonic
Current signal first input TH0400 precision current dividers be converted to first fundamental wave superposition first harmonic voltage signal, use NI
PXIe-4081 digitizers sample the voltage signal of first fundamental wave superposition first harmonic and first fundamental wave are superimposed first harmonic
Voltage signal is converted to the voltage signal of digitized first fundamental wave superposition first harmonic.Wherein, according to the amplitude of current signal
Suitable current-to-voltage convertor is selected, the current signal that first fundamental wave is superimposed to first harmonic is input to current-to-voltage convertor
Input terminal, its output end output first fundamental wave be superimposed first harmonic voltage signal.
Step 3：After the voltage signal of digitized first fundamental wave superposition first harmonic enters data acquisition processing system, by
Transition harmonic measure software measurement in data acquisition processing system obtains the electricity of digitized first fundamental wave superposition first harmonic
Press the first harmonic amplitude in signal.Wherein, the running environment of data acquisition processing system is：In NI PXIe-1062Q cabinets
In, NI PXIe-8135 controllers and NI PXIe-4081 digitizers are loaded respectively, constitute the hard of data acquisition processing system
Part.It is mounted with 7 operating systems of Windows in NI PXIe-8135 controllers, NI is installed in 7 operating systems of Windows
Labview softwares write transition harmonic measure software in NI Labview Software Development Platforms based on discrete Fourier transform,
Constitute the software of data acquisition processing system.
Step 4：The step n times in step 3 are repeated, the average value of the n times measured value of first harmonic amplitude is calculated.
Step 5：According to the fundamental frequency setting value for the FLUKE 6105A harmonic sources being tested in step 1, harmonic amplitude setting
Value and overtone order setting value, the FLUKE 6105A harmonic sources for keeping FLUKE 5730A Multifunctional standard source automatic simulation outputs tested are defeated
First harmonic voltage signal in the voltage signal of the first fundamental wave superposition first harmonic gone out, obtains second harmonic voltage signal.
Wherein, be 50.0Hz according to the fundamental frequency of FLUKE 6105A fundamental waves superposition harmonic voltage signal, harmonic amplitude is 5V and harmonic wave
Number be the amplitude of 10 setting FLUKE 5730A Multifunctional standard source automatics ac voltage signals (simulation harmonic voltage signal) be 5V with
Frequency is 500Hz.
Step 6：Enter data acquisition process system using NI PXIe-4081 digitizers sampling second harmonic voltage signal
System, is converted into digitized second harmonic voltage signal.
Step 7：According to the fundamental voltage amplitude setting value and fundamental frequency setting value of tested FLUKE 6105A harmonic sources,
Sinewave output module is called in NI Labview Software Development Platforms, exports digitized second fundamental wave voltage signal.
Step 8：Make in NI Labview Software Development Platforms digitized second harmonic voltage signal with it is digitized
Second fundamental wave voltage signal additional combining obtains the voltage signal that second harmonic is superimposed by the second fundamental wave that software is simulated.
Step 9：The voltage signal that second fundamental wave is superimposed second harmonic is measured using transition harmonic measure software, obtains second
Fundamental wave is superimposed the second harmonic amplitude of the voltage signal of second harmonic.
Step 10：The step n times in step 9 are repeated, the average value of the n times measured value of second harmonic amplitude is obtained.
Step 11：According to the average value of the n times measured value of first harmonic amplitude, the n times measured value of second harmonic amplitude
The indicated value of average value and FLUKE 5730A Multifunctional standard source automatic output voltage amplitudes calculates tested FLUKE 6105A harmonic waves
The error of indication of source output harmonic wave amplitude.
Step 12：The expanded uncertainty of measurement result is evaluated according to the error of indication.
The system for being used for high-precision harmonic measure writes harmonic measure software by NI Labview Software Development Platforms
The voltage signal of the high-precision fundamental wave superposition harmonic wave of simulation output, and the harmonic component in the voltage signal is tested for calibrating
The harmonic amplitude parameter of harmonic source solves the problems, such as that the harmonic measure precision of existing harmonic source is low.
It should be understood that the size of the serial number of each step is not meant that the order of the execution order in above-described embodiment, each process
Execution sequence should be determined by its function and internal logic, the implementation process without coping with the embodiment of the present invention constitutes any limit
It is fixed.
It is apparent to those skilled in the art that for convenience of description and succinctly, only with above-mentioned each work(
Can unit, module division progress for example, in practical application, can be as needed and by above-mentioned function distribution by different
Functional unit, module are completed, i.e., the internal structure of described device are divided into different functional units or module, more than completion
The all or part of function of description.
In addition, each functional unit in each embodiment of the present invention can be integrated in a processing unit, it can also
It is that each unit physically exists alone, it can also be during two or more units be integrated in one unit.Above-mentioned integrated list
The form that hardware had both may be used in member is realized, can also be realized in the form of SFU software functional unit.
Embodiment described above is merely illustrative of the technical solution of the present invention, rather than its limitations；Although with reference to aforementioned reality
Applying example, invention is explained in detail, it will be understood by those of ordinary skill in the art that：It still can be to aforementioned each
Technical solution recorded in embodiment is modified or equivalent replacement of some of the technical features；And these are changed
Or replace, the spirit and scope for various embodiments of the present invention technical solution that it does not separate the essence of the corresponding technical solution should all
It is included within protection scope of the present invention.
Claims (10)
1. a kind of method for high-precision harmonic measure, which is characterized in that include the following steps：
Initialization is tested the parameter of harmonic source, so that the tested harmonic source is exported a tested initial signal, the parameter includes base
Wave amplitude value parameter, fundamental frequency parameter, harmonic amplitude parameter and harmonic wave count parameter；
It is set according to the fundamental frequency parameter, the harmonic amplitude parameter and the overtone order parameter of the tested harmonic source
Multifunctional standard source automatic is set, the Multifunctional standard source automatic is made to export a second harmonic voltage signal；
The tested initial signal and the second harmonic voltage signal are sampled using digitizer, is converted into digitized described
Tested initial signal and the digitized second harmonic voltage signal；
Sine wave module is according to the fundamental voltage amplitude parameter and the fundamental frequency parameter mould in Usage data collection processing system
It is quasi- to generate a second fundamental wave voltage signal；
The digitized second harmonic voltage signal is added with the second fundamental wave voltage signal to generate fundamental wave superposition humorous
Wave voltage signal；
The first harmonic amplitude of the digitized tested initial signal is measured using transition harmonic measure software；N times are repeated, are obtained
Obtain the arithmetic mean of instantaneous value of the n times measured value of a first harmonic amplitude；
The second harmonic amplitude that the fundamental wave is superimposed harmonic voltage signal is measured using the transition harmonic measure software；Repeat N
It is secondary, obtain the arithmetic mean of instantaneous value of the n times measured value of a second harmonic amplitude；
According to the arithmetic mean of instantaneous value of the n times measured value of the first harmonic amplitude, the n times measured value of the second harmonic amplitude
The first harmonic width on the indicated value of voltage magnitude and the tested harmonic source on arithmetic mean of instantaneous value, the Multifunctional standard source automatic
The indicated value of value calculates the error of indication that the tested harmonic source exports the first harmonic amplitude；
The expanded uncertainty of measurement result is evaluated according to the error of indication.
2. the method as described in claim 1, which is characterized in that described " initialization is tested the parameter of harmonic source, makes described tested
Harmonic source exports a tested initial signal " include the following steps：
The parameter for initializing the tested harmonic source makes the tested harmonic source export first fundamental wave superposition first harmonic
Voltage signal；Or
The parameter for initializing the tested harmonic source makes the tested harmonic source export first fundamental wave superposition first harmonic
Current signal, and the current signal input current electric pressure converter that the first fundamental wave is superimposed to first harmonic be converted to it is described
First fundamental wave is superimposed the voltage signal of first harmonic；
The first fundamental wave is superimposed the voltage signal of first harmonic as the tested initial signal.
3. the method as described in claim 1, which is characterized in that described " according to the n times measured value of the first harmonic amplitude
Arithmetic mean of instantaneous value, the arithmetic mean of instantaneous value of n times measured value of the second harmonic amplitude, on Multifunctional standard source automatic voltage magnitude finger
The indicated value of first harmonic amplitude in indicating value and the tested harmonic source calculates the tested harmonic source and exports the first harmonic
The error of indication of amplitude " specifically includes following steps：
The first harmonic amplitude actual value of the tested harmonic source output is calculated, described the first of the tested harmonic source output is humorous
The n times of the indicated value of the voltage magnitude+first harmonic amplitude are surveyed on wave amplitude actual value=Multifunctional standard source automatic
The arithmetic mean of instantaneous value of the n times measured value of the arithmetic mean of instantaneous value-second harmonic amplitude of magnitude；
The indicating value that the first harmonic amplitude is exported according to tested harmonic source described in the first harmonic amplitude calculated with actual values is missed
Difference, the tested harmonic source export the first harmonic on the error of indication=tested harmonic source of the first harmonic amplitude
The first harmonic amplitude actual value of the indicated value-tested harmonic source output of amplitude.
4. the method as described in claim 1, which is characterized in that the value of the N is the positive integer more than or equal to 10.
5. the method as described in claim 1, which is characterized in that the tested harmonic source is FLUKE 6105A harmonic sources.
6. the method as described in claim 1, which is characterized in that the Multifunctional standard source automatic is the multi-functional marks of FLUKE 5730A
Quasi- source.
7. the method as described in claim 1, which is characterized in that the digitizer is NI PXIe-4081 digitizers.
8. a kind of system for high-precision harmonic measure, which is characterized in that including：
Tested harmonic source is used for initiation parameter, and exports a tested initial signal, the parameter include fundamental voltage amplitude parameter,
Fundamental frequency parameter, harmonic amplitude parameter and harmonic wave count parameter；
Multifunctional standard source automatic, for according to the fundamental frequency parameter of the tested harmonic source, the harmonic amplitude parameter and
The overtone order parameter makes the Multifunctional standard source automatic export a second harmonic voltage signal；
Current-to-voltage convertor, the tested initial signal for exporting the tested harmonic source in the form of current signal
It is converted into and is exported in the form of voltage signal；
Data acquisition processing system is converted into number for sampling the tested initial signal and the second harmonic voltage signal
The tested initial signal of word and the digitized second harmonic voltage signal；
A second fundamental wave voltage signal is generated according to the fundamental voltage amplitude parameter and the simulation of fundamental frequency value parameter；
The digitized second harmonic voltage signal is added with the second fundamental wave voltage signal to generate fundamental wave superposition humorous
Wave voltage signal；
Transition harmonic measure software measures the first harmonic amplitude of the digitized tested initial signal；N times are repeated, obtain one
The arithmetic mean of instantaneous value of the n times measured value of the first harmonic amplitude；
The transition harmonic measure software measures the second harmonic amplitude of the fundamental wave superposition harmonic voltage signal；N times are repeated, are obtained
Obtain the arithmetic mean of instantaneous value of the n times measured value of a second harmonic amplitude；
According to the arithmetic mean of instantaneous value of the n times measured value of the first harmonic amplitude, the n times measured value of the second harmonic amplitude
Arithmetic mean of instantaneous value and the Multifunctional standard source automatic export the indicated value of the voltage magnitude, and it is defeated to calculate the tested harmonic source
Go out the error of indication of the first harmonic amplitude；
The expanded uncertainty of measurement result is evaluated according to the error of indication.
9. system as claimed in claim 8, which is characterized in that the data acquisition processing system includes：
Digital module is converted into digitized for sampling the tested initial signal and the second harmonic voltage signal
The tested initial signal and the digitized second harmonic voltage signal；
Sine wave module, for generating second base according to the fundamental voltage amplitude parameter and the fundamental frequency parameter simulation
Wave voltage signal；
Fundamental wave is superimposed harmonic generation module, for the second harmonic voltage signal to be added with the second fundamental wave voltage signal
Generate a fundamental wave superposition harmonic voltage signal；
Harmonic measure module, for measuring the harmonic component in the tested initial signal and fundamental wave superposition harmonic signal；
Controller module is used for installation and operation operating system, and is opened in installing NI Labview softwares in the operating system
Platform is sent out, the sine wave module is developed based on the NI Labview Software Development Platforms, the fundamental wave is superimposed harmonic generation
Module and harmonic measure module；
Calculation processing module, the calculation processing module include harmonic amplitude arithmetic mean of instantaneous value computing module, harmonic amplitude indicating value
Error calculating module and harmonic amplitude uncertainty calculation module, the harmonic amplitude arithmetic mean of instantaneous value computing module is for calculating
The arithmetic of the arithmetic mean of instantaneous value of the n times measured value of the first harmonic amplitude and the n times measured value of the second harmonic amplitude is flat
Mean value, the harmonic amplitude error of indication computing module export the first harmonic amplitude for calculating the tested harmonic source
The error of indication, the harmonic amplitude uncertainty calculation module are used to evaluate the extension of measurement result not according to the error of indication
Degree of certainty.
10. system as claimed in claim 8, which is characterized in that the harmonic amplitude error of indication computing module further includes
One harmonic amplitude calculated with actual values module and first harmonic amplitude error of indication computing module,
The first harmonic amplitude calculated with actual values module, the first harmonic amplitude for calculating the tested harmonic source output are real
Actual value, the voltage amplitude on the first harmonic amplitude actual value=Multifunctional standard source automatic of the tested harmonic source output
The n times of the arithmetic mean of instantaneous value-second harmonic amplitude of the n times measured value of the indicated value of value+first harmonic amplitude measure
The arithmetic mean of instantaneous value of value；
The first harmonic amplitude error of indication computing module, for according to quilt described in the first harmonic amplitude calculated with actual values
The error of indication that harmonic source exports the first harmonic amplitude is surveyed, the tested harmonic source exports showing for the first harmonic amplitude
It is worth described the first of the indicated value-tested harmonic source output of the first harmonic amplitude on error=tested harmonic source
Harmonic amplitude actual value.
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