CN109782206A - A kind of compensation for calibrating errors method for wideband transient voltage measuring device - Google Patents
A kind of compensation for calibrating errors method for wideband transient voltage measuring device Download PDFInfo
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- CN109782206A CN109782206A CN201811600865.6A CN201811600865A CN109782206A CN 109782206 A CN109782206 A CN 109782206A CN 201811600865 A CN201811600865 A CN 201811600865A CN 109782206 A CN109782206 A CN 109782206A
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Abstract
The invention discloses a kind of compensation for calibrating errors methods for wideband transient voltage measuring device, comprising: demarcates to wideband transient voltage measuring device, establishes output error models；Establish the digitized compensation model based on the output error models；Assess the measurement error after the digitized compensation model compensation；Digitized compensation is carried out to the output waveform of the wideband transient voltage measuring device.The present invention fully considers influence of the stray parameter to wideband transient voltage measuring device transmission characteristic present in actual installation scene, field calibration is carried out to transient voltage measuring device, by carrying out digitized compensation to output waveform, make up intrinsic frequency transmitting defect of the measuring device in wide frequency range, to which really reduction inputs the wave character of transient voltage, Stability and dependability is high, easy to operate.
Description
Technical field
The invention belongs to high-voltage technologies and measuring technique, measure more particularly, to one kind for wideband transient voltage
The compensation for calibrating errors method of device.
Background technique
With the development of technology of transmission of electricity, the safe operation of power grid is increasingly taken seriously.Wherein power grid transient voltage is imitative
True calculating and field measurement are the main means of current research system insulation cooperation, equipment fault diagnosis and causes of incident analysis；
And the primary foundation that transient voltage is verifying transient voltage simulation calculation conclusion is surveyed, therefore the accurate measurement pair of transient overvoltage
The safety guarantee of operation of power networks is significant.
Transient voltage waveform is complicated, and frequency component is abundant, accurately to obtain its waveform, needs to fully assess transient voltage survey
Measure transmission characteristic of the device under transient voltage effect.But transient voltage measuring device install at the scene after with surrounding objects it
Between there are stray parameters so that its practical transmission characteristic has differences with laboratory investment result, lead to transient voltage measurement dress
There are errors for the waveform and the waveform of input for setting output.Therefore, it is necessary to measure under actual condition mounted transient voltage
Device carries out field calibration, and analyzes its transmission error, completes the practical compensation to secondary side output waveform, and reduction is true
Real primary side input waveform.
Summary of the invention
In view of the drawbacks of the prior art, it is an object of the invention to fully consider spuious ginseng present in actual installation scene
The influence of several pairs of wideband transient voltage measuring device transmission characteristics carries out field calibration to transient voltage measuring device, by right
Output waveform carries out digitized compensation, intrinsic frequency transmitting defect of the measuring device in wide frequency range is made up, thus really also
The wave character of original input transient voltage.
To achieve the above object, the present invention provides a kind of compensation for calibrating errors method for wideband transient voltage measuring device,
Include:
Wideband transient voltage measuring device is demarcated, output error models are established；
Establish the digitized compensation model based on the output error models；
Assess the measurement error after the digitized compensation model compensation；
When the measurement error is met the requirements, the wideband transient voltage is measured according to the digitized compensation model and is filled
The output waveform set carries out digitized compensation.
Further, described that wideband transient voltage measuring device is demarcated, establish output error models, comprising:
Obtain output of the standard voltage source Jing Guo gauge measurement system；
Obtain output of the standard voltage source Jing Guo the wideband transient voltage measuring device；
Using the wideband transient voltage measuring device as Two-port netwerk passive network, established by Mathematical Method described in
Output error models；
The output error models parameter is solved based on identification technology；
Obtain the transmission characteristic of the wideband transient voltage detection device.
Further, the output error models expression formula are as follows:
In formula, y (t) is output of the standard voltage source by the gauge measurement system；
X (t) is output of the standard voltage source by the wideband transient voltage measuring device；
Q is time-displacement operator, q-k(((i-k) Δ t), Δ t are the sampling interval to i Δ t)=x to x；
A (q)=1+a1q-1+a2q-2+…+am-1q-(m-1)+amq-m；
B (q)=b0+b1q-1+b2q-2+…+bn-1q-(n-1)+bnq-n；
E (t) is wideband transient voltage measuring device output error vector.
Parameter a is solved based on identification technologyi、bi, can be obtained the wideband transient voltage measuring device time domain,
Frequency Domain Transfer.
Further, for the amplitude fluctuations range of the standard voltage source less than 1%, frequency range reaches nanosecond, output
The frequency component of voltage covers the frequency range of measured wideband transient voltage.
Preferably, the standard voltage source is using surge voltage source or the sinusoidal alternating voltage source of Frequency Adjustable wideband.
Further, the gauge measurement system meets the requirement of 16927 Plays measuring system of standard GB/T/T,
Preferable Frequency transfer can be met in wide frequency range.
Preferably, the gauge measurement system uses resistance-capacitance type high-voltage bleeder.
Further, the gauge measurement system should ensure that the transmission characteristic of the wideband transient voltage measuring system not
It produces bigger effect.
Further, the digitized compensation model of the foundation based on the output error models, comprising:
Output using the standard voltage source Jing Guo the wideband transient voltage measuring device is as the digitized compensation
Model input to be compensated；
Output using the standard voltage source Jing Guo the gauge measurement system is as the digitized compensation model compensation
Desired output afterwards；
The digitized compensation model is established by Mathematical Method；
The digitized compensation model parameter is solved based on identification technology.
The digitized compensation model expression are as follows:
In formula, y*It (t) is to be exported after compensating；Y (t) is output to be compensated；E (t) is error term.
C(q-1)=1+c1q-1+c2q-2+…+ck-1q-(k-1)+ckq-k；
D(q-1)=d0+d1q-1+b2q-2+…+dl-1q-(l-1)+dlq-l；
By y (t) as output to be compensated, it regard x (t) as compensated output, Converse solved model parameter, parameter
ci、diMethod for solving and parameter ai、biIt is identical.
Further, measurement error of the assessment after the digitized compensation model compensation, passes through formula:
FIT=100* (1-norm (Y-YHAT)/norm (Y-mean (Y))) realizes that Y is desired output, and YHAT is compensation
After export, norm is two Norm functions, and norm (x) indicates that the sum of each element square opens radical sign again in x, and mean is mean value letter
Number, mean (x) are indicated to the sum of element each in x divided by the number of element.
The amplitude difference exported after desired output and compensation is no more than 3%, and the FIT value being calculated is greater than 99
When, it is believed that the measurement error is met the requirements, i.e., the described digitized compensation model is effective.
Further, it is described according to the digitized compensation model to the output wave of the wideband transient voltage measuring device
Shape carries out digitized compensation, comprising:
Establish the submodule of the digitized compensation model；
Obtain output of the wideband transient voltage Jing Guo the wideband transient voltage measuring device；
The output is accessed into the submodule by data transformation interface.
Export compensated waveform.
In general, contemplated technical solution can achieve the following beneficial effects through the invention:
(1) by field calibration, error output model is established, spuious factor pair present in site environment is fully taken into account
The influence of measuring device transmission characteristic, can accurate evaluation measuring device install at the scene after measurement error.
(2) digitized compensation technology is used, intrinsic frequency transmitting defect of the measuring device in wide frequency range is made up, stablizes
Property and high reliablity, it is easy to operate, it can really restore the transient voltage waveform of primary side.
Detailed description of the invention
Fig. 1 is a kind of flow chart of compensation for calibrating errors method for wideband transient voltage measuring device according to the invention；
Fig. 2 is a kind of calibration schematic layout pattern for wideband transient voltage measuring device according to the invention；
Fig. 3 is a kind of digitized compensation operation schematic diagram for wideband transient voltage measuring device according to the invention；
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
Fig. 1 is a kind of flow chart for wideband transient voltage measuring device compensation for calibrating errors method according to the invention, packet
Include following steps:
S101: wideband transient voltage measuring device is demarcated, output error models are established；
Specifically, which includes:
Obtain output of the standard voltage source Jing Guo gauge measurement system；
Obtain output of the standard voltage source Jing Guo the wideband transient voltage measuring device；
Using the wideband transient voltage measuring device as Two-port netwerk passive network, established by Mathematical Method described in
Output error models；
The output error models parameter is solved based on identification technology；
Obtain the transmission characteristic of the wideband transient voltage detection device.
Fig. 2 is using calibration method schematic layout pattern of the invention, as shown in Fig. 2, when field calibration, comprising: standard electric
Potential source, wideband transient voltage gauge measurement system, wideband transient voltage detection device；
Wideband transient voltage gauge measurement system and wideband transient voltage measuring device are in parallel, and standard voltage source is as the two
Common input.
The transmission characteristic of transient voltage measuring device is not produced it should be noted that the access of gauge measurement system should ensure that
The transmission characteristic variation of raw larger impact, i.e. wideband transient voltage measuring device is no more than 1%.；The amplitude wave of standard voltage source
Range is moved less than 1%, frequency range reaches nanosecond, and the frequency component of output voltage should cover the frequency model of wideband transient voltage
It encloses, surge voltage source or Frequency Adjustable wideband sinusoidal alternating voltage source may be selected；Gauge measurement system meets standard GB/T/T
The accuracy requirement of 16927 Plays measuring systems can meet preferable Frequency transfer in wide frequency range, can generally adopt
With resistance-capacitance type high-voltage bleeder.
The output of transient voltage gauge measurement system is denoted as x (t), the output of transient voltage measuring device is denoted as y
(t)。
Corner frequency in wideband transient voltage measuring device transmission characteristic, so that existing centainly between y (t) and x (t)
Deviation will compensate the output waveform y (t) of distortion, after should installing at the scene to wideband transient voltage measuring device first
Transmission characteristic analyzed, establish its output error models.
Wideband transient voltage measuring device is considered to handle, can establish by Data Discretization at Two-port netwerk passive network
Its output error models:
In formula (1), q is time-displacement operator, q-k(((i-k) Δ t), Δ t are the sampling interval to i Δ t)=x to x；
E (t) is wideband transient voltage measuring device output error vector.
A (q)=1+a1q-1+a2q-2+…+am-1q-(m-1)+amq-m；
B (q)=b0+b1q-1+b2q-2+…+bn-1q-(n-1)+bnq-n；
Parameter ai、biThe time domain specification of transient voltage measuring device is reflected, formula (1) can be converted to wideband transient voltage
The frequency domain discretization transfer function model of measuring device:
Wherein A (z)=1+a1z-1+a2z-2+…+am-1z-(m-1)+amz-m；
B (z)=b0+b1z-1+b2z-2+…+bn-1z-(n-1)+bnz-n。
Parameter ai、biBy Matlab program, is solved, calculated using the parameter extraction algorithm based on identification technology
Parameter ai、bi, time domain, the Frequency Domain Transfer of wideband transient voltage measuring device can be obtained, and can therefrom obtain different frequency range
Sensitivity and corner frequency, for subsequent digitized compensation provide data support.
S102: the digitized compensation model based on the output error models is established；
Specifically, which includes:
Output using the standard voltage source Jing Guo the wideband transient voltage measuring device is as the digitized compensation
Model input to be compensated；
Output using the standard voltage source Jing Guo the gauge measurement system is as the digitized compensation model compensation
Desired output afterwards；
The digitized compensation model is established by Mathematical Method；
The digitized compensation model parameter is solved based on identification technology.
The form and output error models of digitized compensation model just as:
In formula, y*It (t) is to be exported after compensating；Y (t) is output to be compensated；E (t) is error term.
C(q-1)=1+c1q-1+c2q-2+…+ck-1q-(k-1)+ckq-k；
D(q-1)=d0+d1q-1+b2q-2+…+dl-1q-(l-1)+dlq-l；
By y (t) as output to be compensated, it regard x (t) as compensated output, Converse solved model parameter, parameter
ci、diMethod for solving and parameter ai、biIt is identical.
S103: measurement error of the assessment after the digitized compensation model compensation；
Specifically, whether measurement error meets the requirements and can pass through formula in the step:
FIT=100* (1-norm (Y-YHAT)/norm (Y-mean (Y))) is realized；
Formula, Y are desired outputs, and YHAT is exported after compensating, and norm is two Norm functions, and norm (x) indicates each in x
The sum of element square opens radical sign again, and mean is mean function, and mean (x) indicates to the sum of element each in x divided by element
Number.
The amplitude difference exported after desired output and compensation is no more than 3%, and the FIT value being calculated is greater than 99
When, it is believed that measurement error is met the requirements, i.e. digitized compensation model is effective.
S104: it is digitized according to output waveform of the digitized compensation model to wideband transient voltage measuring device
Compensation；
Specifically, which includes:
The submodule of the digitized compensation model is established by MATLAB programming；
Obtain output of the wideband transient voltage Jing Guo wideband transient voltage measuring device；
It is as shown in Figure 3: output directly to be accessed to the submodule of digitized compensation model by data transformation interface, to output
Waveform compensates, and completes output waveform after the reduction of frequency of loss component.
As it will be easily appreciated by one skilled in the art that the foregoing is merely illustrative of the preferred embodiments of the present invention, not to
The limitation present invention, any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should all include
Within protection scope of the present invention.
Claims (9)
1. a kind of compensation for calibrating errors method for wideband transient voltage measuring device characterized by comprising
Wideband transient voltage measuring device is demarcated, output error models are established；
Establish the digitized compensation model based on the output error models；
Assess the measurement error after the digitized compensation model compensation；
When the measurement error is met the requirements, according to the digitized compensation model to the wideband transient voltage measuring device
Output waveform carries out digitized compensation.
2. a kind of compensation for calibrating errors method for wideband transient voltage measuring device as described in claim 1, which is characterized in that
It is described that wideband transient voltage measuring device is demarcated, establish output error models, comprising:
Obtain output of the standard voltage source Jing Guo gauge measurement system；
Obtain output of the standard voltage source Jing Guo the wideband transient voltage measuring device；
Using the wideband transient voltage measuring device as Two-port netwerk passive network, the output is established by Mathematical Method
Error model；
The output error models parameter is solved based on identification technology；
Obtain the transmission characteristic of the wideband transient voltage detection device.
3. a kind of compensation for calibrating errors method for wideband transient voltage measuring device as claimed in claim 2, which is characterized in that
For the amplitude fluctuations range of the standard voltage source less than 1%, frequency range reaches nanosecond, and the frequency component of output voltage covers
The frequency range of measured wideband transient voltage.
4. a kind of compensation for calibrating errors method for wideband transient voltage measuring device as claimed in claim 3, which is characterized in that
The standard voltage source is using surge voltage source or the sinusoidal alternating voltage source of Frequency Adjustable wideband.
5. a kind of compensation for calibrating errors method for wideband transient voltage measuring device as claimed in claim 2, which is characterized in that
The gauge measurement system meets the requirement of 16927 Plays measuring system of standard GB/T/T.
6. a kind of compensation for calibrating errors method for wideband transient voltage measuring device as claimed in claim 5, which is characterized in that
The gauge measurement system uses resistance-capacitance type high-voltage bleeder.
7. a kind of compensation for calibrating errors method for the measurement of wideband transient voltage as described in claim 1, which is characterized in that described
Establish the digitized compensation model based on the output error models, comprising:
Output using the standard voltage source Jing Guo the wideband transient voltage measuring device is as the digitized compensation model
Input to be compensated；
By the standard voltage source after the output of the gauge measurement system is as the digitized compensation model compensation
Desired output；
The digitized compensation model is established by Mathematical Method；
The digitized compensation model parameter is solved based on identification technology.
8. a kind of compensation for calibrating errors method for the measurement of wideband transient voltage as described in claim 1, which is characterized in that described
Assess measurement error after the digitized compensation model compensation, by formula F IT=100* (1-norm (Y-YHAT)/
Norm (Y-mean (Y))) it realizes；
Y is the compensated desired output, and YHAT is the reality output after the digitized compensation model compensation, and norm is
Two Norm functions, norm (x) indicate that the sum of each element square opens radical sign again in x, and mean is mean function, and mean (x) is indicated
To the sum of element each in x divided by the number of element；
The compensated desired output is differed with the compensated reality output amplitude is no more than 3%, and is calculated
FIT value be greater than 99, it is believed that the measurement error is met the requirements.
9. a kind of compensation for calibrating errors method for the measurement of wideband transient voltage as described in claim 1, which is characterized in that described
Digitized compensation, packet are carried out according to output waveform of the digitized compensation model to the wideband transient voltage measuring device
It includes:
Establish the submodule of the digitized compensation model；
Obtain output of the wideband transient voltage Jing Guo the wideband transient voltage measuring device；
The output is accessed into the submodule by data transformation interface；
Export compensated waveform.
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