CN105467207B - A kind of high-accuracy voltage power frequency measuring system and method based on intelligent substation - Google Patents
A kind of high-accuracy voltage power frequency measuring system and method based on intelligent substation Download PDFInfo
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
- G01R23/02—Arrangements for measuring frequency, e.g. pulse repetition rate; Arrangements for measuring period of current or voltage
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Abstract
The high-accuracy voltage power frequency measuring system based on intelligent substation that the invention discloses a kind of, including primary equipment, secondary device, processor DSP, the secondary device includes electronic type voltage transformer, electronic current mutual inductor, A/D Acquisition Circuit, combining unit device, the electronic type voltage transformer is connected with the output end of the primary equipment respectively with the input terminal of the electronic current mutual inductor, the electronic type voltage transformer is connected with the input terminal of the A/D Acquisition Circuit respectively with the output end of the electronic current mutual inductor, the output end of the A/D Acquisition Circuit is connected with the input terminal of the combining unit device, the output end of the combining unit device is connected with the input terminal of the processor DSP.The present invention also proposes a kind of high-accuracy voltage power frequency measurement method based on intelligent substation, realizes the power frequency measurement and correction of the sampled signal SV of intelligent substation intelligence.
Description
Technical field
The present invention relates to a kind of high-accuracy voltage power frequency measuring system and method based on intelligent substation, belong to electrician's skill
Art field.
Background technique
In the power system, electric voltage frequency is one of the important indicator for reflecting operation of power networks state, usually passes through measurement phase
The frequency of the small signal of secondary voltage is answered to be obtained.It is then specially that the corresponding combining unit of calculating measurement is defeated in intelligent substation
The power frequency magnitude of respective channel in IEC61850-9-2 message out.The more time domain based on zero crossing of previous domestic application is surveyed
Amount method, due to current demand signal discretization and no longer be applicable in；It is widely used, the frequency-domain calculations method based on Fourier transformation,
Due to FFT truncation and fence effect and cause the measurement accuracy of correlated frequency value not high.Furthermore at least 4K sampling, more than ten it is logical
The parallel mass data in road also brings very big difficulty to the rapid survey of intelligent substation high-accuracy voltage power frequency.
Summary of the invention
It is an object of the invention to overcome defect of the existing technology, above-mentioned technical problem is solved, proposes that one kind is based on
The high-accuracy voltage power frequency measuring system and method for intelligent substation carry out power frequency by the phase information of SV sampled signal
Measurement and correction.
The present invention adopts the following technical scheme: a kind of high-accuracy voltage power frequency measuring system based on intelligent substation,
It is characterized in that, including primary equipment, secondary device, processor DSP, the primary equipment are connected with the secondary device, institute
Secondary device is stated to be connected with the processor DSP；The secondary device includes that electronic type voltage transformer, electronic current are mutual
Sensor, A/D Acquisition Circuit, combining unit device, the electronic type voltage transformer are defeated with the electronic current mutual inductor
Enter end to be connected with the output end of the primary equipment respectively, the electronic type voltage transformer and the electronic current mutual inductance
The output end of device is connected with the input terminal of the A/D Acquisition Circuit respectively, the output end of the A/D Acquisition Circuit and the conjunction
And the input terminal of cell arrangement is connected, the output end of the combining unit device is connected with the input terminal of the processor DSP
It connects.
The present invention also proposes a kind of high-accuracy voltage power frequency measurement method based on intelligent substation, which is characterized in that packet
Include following steps:
The channel step SS1 is extracted, and is specifically included:
Step SS11 sets sampling function as X0(k)；
Step SS12 sampling number per second is that the frequency of 4000, SV signal is 50Hz, and function sampling quite multiplies a rectangle
Window function Rect (), 4000 point sampling functions of interception are X1(k)=X0(k)*Rect(0,3999)；
Step SS2 signal condition, specifically includes:
The sampling function X that step SS21 obtains the step SS11(k) it is further sampled, the sampling function X1
(k) multiply rectangular window function Rect (0,767), i.e. X2(k)=X1(k) * Rect (0,767)=X0(k)*Rect(0,3999)*Rect
(0,767)=X0(k)*Coef1Wherein, Coef1It is expressed as constant amount；
The sampling function X that step SS22 obtains the step SS212(k) it is further processed, the sampling function X2
(k) multiply Hanning window function Hanning (), i.e. X3(k)=X2(k) * Hanning ()=X0(k) * Coef1*Hanning ()=X0
(k)*Coef2Wherein, Coef2It is expressed as constant amount；
Step SS3 power frequency calculates, and specifically includes:
The sampling function X that step SS31 obtains the step SS23(k) segmentation interception, the sampling function X are carried out3(k)
Multiply rectangular window function Rect (), i.e.,
X4(k)=X3(k)*Rect(0,511)；
X5(k)=X3(k)*Rect(256,767)；
The sampling function X that step SS32 obtains the step SS314(k) and X5(k) it is overlapped processing respectively, i.e.,
X6(k1)=X4(k1)+X4(511-k1) (0≤k1≤ 255)；
X7(k2)=X5(k2)+X5(767-k2) (256≤k2≤ 512)；
The sampling function X that step SS33 respectively obtains step SS326(k1) and X7(k2) carry out FFT fast Fourier transform
Operation, i.e.,
Z8(f)=FFT { X6(k1)}；
Z9(f)=FFT { X7(k2)}；
The sampling function Z that step SS34 obtains the step SS338(f) FFT operation is carried out, phasor amplitude, i.e. P are sought8
(f)=| Z8(f)|2；
Step SS35 seeks sampling function Z8(f) frequency when maximum amplitude, i.e.,
f-maxpower=f | P8(f-maxpower)=max (P8(f))}；
Step SS36 seeks frequency f-maxpowerZ when maximum8(f) and Z9(f) phase difference, i.e.,
Delta(f-maxpower)=phase { Z8(f-maxpower)}-phase{Z9(f-maxpower)}；
Step SS37 finally carries out frequency correction, the frequency after correction are as follows:
F=f-maxpower+Delta(f-maxpower)/256。
Advantageous effects of the invention: the present invention uses square since the SV sampling value message of IEC61850-9-2
Shape window intercepts several data in the synchronous channel of pulse per second (PPS), and by searching for the ceiling capacity frequency of data, it is close to calculate channel power frequency
Like value；It realizes through the phase information after initial data series of transformations, calculates the corrected value of channel power frequency, finally obtain logical
The function of the high-accuracy voltage power frequency value in road.
Detailed description of the invention
Fig. 1 is hardware connection diagram of the invention.
Fig. 2 is a kind of one embodiment of high-accuracy voltage power frequency measurement method based on intelligent substation of the invention
Method flow diagram.
Specific embodiment
The invention will be further described below in conjunction with the accompanying drawings.Following embodiment is only used for clearly illustrating the present invention
Technical solution, and not intended to limit the protection scope of the present invention.
Fig. 1 is hardware connection diagram of the invention, and the present invention proposes a kind of high-accuracy voltage based on intelligent substation
Power frequency measuring system, which is characterized in that including primary equipment, secondary device, processor DSP, the primary equipment and described two
Secondary device is connected, and the secondary device is connected with the processor DSP；The secondary device includes electronic type voltage mutual inductance
Device, electronic current mutual inductor, A/D Acquisition Circuit, combining unit device, the electronic type voltage transformer and the electronic type
The input terminal of current transformer is connected with the output end of the primary equipment respectively, the electronic type voltage transformer with it is described
The output end of electronic current mutual inductor is connected with the input terminal of the A/D Acquisition Circuit respectively, the A/D Acquisition Circuit
Output end is connected with the input terminal of the combining unit device, the output end and the processor of the combining unit device
The input terminal of DSP is connected.
The working principle of a kind of high-accuracy voltage power frequency measuring system based on intelligent substation of the invention are as follows: pass through electricity
Minor voltage transformer and electronic current mutual inductor measure the alternating voltage and alternating current of the route of primary equipment respectively, so
The alternating voltage measured or current signal are converted into the voltage signal within 5V afterwards, then carried out again by A/D acquisition circuit
Digital signal after AD conversion is accessed combining unit device by low-pass filtering, analog-to-digital conversion, and combining unit device is by the letter on each road
It number merges and encapsulates, then input processor DSP carries out frequency calculating.
Fig. 2 is a kind of one embodiment of high-accuracy voltage power frequency measurement method based on intelligent substation of the invention
Method flow diagram indicates that each power frequency period samples 80 if the periodic sampling points N of each power frequency, the present embodiment N=80
The default frequency of point, system is 50Hz, thus sampling interval △ T=0.25ms；Each sampled value buffer area clear 0；Setting receives
Sampled data array a1 [767], a2 [255], a3 [255]；Initialize each field planting and and configuration parameter, such as channel factor and be used for
The voltage channel of frequency measurement.
Advanced row data sampling obtains new data, and voltage sample value is stored array a1 [767], and what be will acquire is new
Data window is multiplied by Hanning window function and is stored back to a1 [767] array, then by the data 0~511 in a1 [767] array with 255 numbers
According to being added (a1 [0]+a1 [511] for symmetrical centre；a1[1]+a1[510]；A1 [2]+a1 [509] ...), it is obtained new
Data deposit array a2 [255] arrived.Data 256~767 in a1 array are added (a1 [256] with 512 for symmetrical centre
+a1[767]；a1[257]+a1[766]；A1 [258]+a1 [764] ...), the data newly obtained are stored in array a3
[255]。
Fourier transformation, which is carried out, using data of the FFT to new array a2 [255] respectively obtains Z8(f)=FFT { X6(k) }, a3
[256] data carry out Fourier transformation and respectively obtain Z9(f)=FFT { X7(k)}。
A2 [255] array obtains frequency f corresponding to maximum amplitude in data after Fourier transformation-maxpower=f |
P8(f-maxpower)=max (P8(f))}；F in a3 [255] after Fourier transformation-maxpowerCorresponding phase value, with a2 [255]
F after middle Fourier transformation-maxpowerCorresponding phase value obtains phase difference after subtracting each other
Delta(f-maxpower)=phase { Z8(f-maxpower}-phase{Z9(f-maxpower)}；Frequency correction is finally carried out,
Frequency f after correction are as follows: f=f-maxpower+Delta(f-maxpower)/256。
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, without departing from the technical principles of the invention, several improvement and deformations can also be made, these improvement and deformations
Also it should be regarded as protection scope of the present invention.
Claims (1)
1. a kind of measurement method of the high-accuracy voltage power frequency measuring system based on intelligent substation, which is characterized in that the intelligence
The high-accuracy voltage power frequency measuring system of energy substation includes primary equipment, secondary device, processor DSP, the primary equipment
It is connected with the secondary device, the secondary device is connected with the processor DSP；The secondary device includes electronic type
Voltage transformer, electronic current mutual inductor, A/D Acquisition Circuit, combining unit device, the electronic type voltage transformer and institute
The input terminal for stating electronic current mutual inductor is connected with the output end of the primary equipment respectively, the electronic type voltage mutual inductance
Device is connected with the input terminal of the A/D Acquisition Circuit respectively with the output end of the electronic current mutual inductor, and the A/D is adopted
The output end of collector is connected with the input terminal of the combining unit device, the output end of the combining unit device with it is described
The input terminal of processor DSP is connected；
The measurement method includes the following steps:
The channel step SS1 is extracted, and is specifically included:
Step SS11 sets sampling function as X0(k)；
Step SS12 sampling number per second is that the frequency of 4000, SV signal is 50Hz, and function sampling quite multiplies a rectangular window letter
Number Rect (), 4000 point sampling functions of interception are X1(k)=X0(k)*Rect(0,3999)；
Step SS2 signal condition, specifically includes:
The sampling function X that step SS21 obtains the step SS11(k) it is further sampled, the sampling function X1(k) multiply
Rectangular window function Rect (0,767), i.e.,
X2(k)=X1(k) * Rect (0,767)=X0(k) * Rect (0,3999) * Rect (0,767)=X0(k)*Coef1Wherein,
Coef1It is expressed as constant amount；
The sampling function X that step SS22 obtains the step SS212(k) it is further processed, the sampling function X2(k)
Multiply Hanning window function Hanning (), i.e.,
X3(k)=X2(k) * Hanning ()=X0(k) * Coef1*Hanning ()=X0(k)*Coef2
Wherein, Coef2It is expressed as constant amount；
Step SS3 power frequency calculates, and specifically includes:
The sampling function X that step SS31 obtains the step SS23(k) segmentation interception, the sampling function X are carried out3(k) multiply square
Shape window function Rect (), i.e.,
X4(k)=X3(k)*Rect(0,511)；
X5(k)=X3(k)*Rect(256,767)；
The sampling function X that step SS32 obtains the step SS314(k) and X5(k)
It is overlapped processing respectively, i.e.,
X6(k1)=X4(k1)+X4(511-k1) (0≤k1≤ 255)；
X7(k2)=X5(k2)+X5(767-k2) (256≤k2≤ 512)；
The sampling function X that step SS33 respectively obtains step SS326(k1) and X7(k2) FFT fast Fourier transform operation is carried out,
I.e.
Z8(f)=FFT { X6(k1)}；
Z9(f)=FFT { X7(k2)}；
The sampling function Z that step SS34 obtains the step SS338(f) operation is carried out, phasor amplitude, i.e. P are sought8(f)=|
Z8(f)|2；
Step SS35 seeks sampling function Z8(f) frequency when maximum amplitude, i.e.,
f-maxpower=f | P8(f-maxpower)=max (P8(f))}；
Step SS36 seeks frequency f-maxpowerZ when maximum8(f) and Z9(f) phase difference,
That is Delta (f-maxpower)=phase { Z8(f-maxpower)}-phase{Z9(f-maxpower)}；
Step SS37 finally carries out frequency correction, the frequency after correction are as follows:
F=f-maxpower+Delta(f-maxpower)/256。
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| Publication number | Priority date | Publication date | Assignee | Title |
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2016
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| CN102385003A (en) * | 2011-11-07 | 2012-03-21 | 清华大学 | Method for detecting frequency and phase of voltage signals or current signals in electric power system |
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