CN105467207A - High precision voltage power frequency measurement system and method based on intelligent substation - Google Patents
High precision voltage power frequency measurement system and method based on intelligent substation Download PDFInfo
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- CN105467207A CN105467207A CN201610038566.2A CN201610038566A CN105467207A CN 105467207 A CN105467207 A CN 105467207A CN 201610038566 A CN201610038566 A CN 201610038566A CN 105467207 A CN105467207 A CN 105467207A
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- maxpower
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- G—PHYSICS
- G01—MEASURING; TESTING
- 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
Abstract
The invention discloses a high precision voltage power frequency measurement system based on an intelligent substation, comprising a primary device, a secondary device and a DSP. The secondary device comprises an electronic voltage transformer, an electronic current transformer, an A/D collection circuit, and a merging unit device. The input terminals of the electronic voltage transformer and the electronic current transformer are both in connection with the output terminal of the primary device, and the output terminals are both in connection with the input terminal of the A/D collection circuit; the output terminal of the A/D collection circuit is in connection with the input terminal of the merging unit device; the output terminal of the merging unit device is in connection with the input terminal of the DSP. The invention also provides a high precision voltage power frequency measurement method based on an intelligent substation, and realizes the power frequency measurement and correction of intelligent sampling signals SV of the intelligent substation.
Description
Technical field
The present invention relates to a kind of high-accuracy voltage power frequency measuring system based on intelligent substation and method, belong to electrical technology field.
Background technology
In electric system, electric voltage frequency is one of important indicator of reflection operation of power networks state, and the frequency usually by measuring corresponding secondary voltage small-signal is obtained.In intelligent substation, be then specially the power frequency value of respective channel in the IEC61850-9-2 message of the corresponding merge cells output of computation and measurement.In the past domestic application more, based on the ime-domain measuring method of zero crossing, no longer applicable due to the discretize of current demand signal; Be widely used, based on the frequency-domain calculations method of Fourier transform, due to blocking and fence effect and cause the measuring accuracy of correlated frequency value not high of FFT.In addition the mass data of at least 4K sampling, more than ten channel parallel brings very large difficulty also to the Quick Measurement of intelligent substation high-accuracy voltage power frequency.
Summary of the invention
The object of the invention is to overcome the defect that prior art exists, solve the problems of the technologies described above, propose a kind of high-accuracy voltage power frequency measuring system based on intelligent substation and method, by the phase information of SV sampled signal power frequency measured and correct.
The present invention adopts following technical scheme: a kind of high-accuracy voltage power frequency measuring system based on intelligent substation, it is characterized in that, comprise primary equipment, secondary device, processor DSP, described primary equipment is connected with described secondary device, and described secondary device is connected with described processor DSP, described secondary device comprises electronic type voltage transformer, electronic current mutual inductor, A/D Acquisition Circuit, merge cells device, described electronic type voltage transformer is connected with the output terminal of described primary equipment respectively with the input end of described electronic current mutual inductor, described electronic type voltage transformer is connected with the input end of described A/D Acquisition Circuit respectively with the output terminal of described electronic current mutual inductor, the output terminal of described A/D Acquisition Circuit is connected with the input end of described merge cells device, the output terminal of described merge cells device is connected with the input end of described processor DSP.
The present invention also proposes a kind of high-accuracy voltage power frequency measuring method based on intelligent substation, it is characterized in that, comprises the steps:
Step SS1 passage extracts, and specifically comprises:
It is X that step SS11 sets sampling function
0(k);
Step SS12 sampling number per second is the frequency of 4000, SV signal is 50Hz, and a rectangular window function Rect () is quite taken advantage of in function sampling, and intercepting 4000 point sampling functions is X
1(k)=X
0(k) * Rect (0,3999);
Step SS2 signal condition, specifically comprises:
The sampling function X that step SS21 obtains described step SS1
1k () is sampled further, described sampling function X
1k () takes advantage of rectangular window function Rect (0,767), i.e. X
2(k)=X
1(k) * Rect (0,767)=X
0(k) * Rect (0,3999) * Rect (0,767)=X
0(k) * Coef
1wherein, Coef
1be expressed as constant amount;
The sampling function X that step SS22 obtains described step SS21
2k () is further processed, described sampling function X
2k () takes advantage of Hanning window function Hanning (), i.e. X
3(k)=X
2(k) * Hanning ()=X
0(k) * Coef1*Hanning ()=X
0(k) * Coef
2wherein, Coef
2be expressed as constant amount;
Step SS3 power frequency calculates, and specifically comprises:
The sampling function X that step SS31 obtains described step SS2
3k () carries out segmentation intercepting, described sampling function X
3k () takes advantage of rectangular window function Rect (), namely
X
4(k)＝X
3(k)*Rect(0,511)；
X
5(k)＝X
3(k)*Rect(256,767)；
The sampling function X that step SS32 obtains described step SS31
4(k) and X
5k () carries out overlap-add procedure respectively, namely
X
6(k
1)＝X
4(k
1)+X
4(511-k
1)(0<＝k
1<＝255)；
X
7(k
2)＝X
5(k
2)+X
5(767-k
2)(256<＝k
2<＝512)；
Step SS33 is respectively to the sampling function X that step SS32 obtains
6(k
1) and X
7(k
2) carry out FFT fast Fourier transform computing, namely
Z
8(f)＝FFT{X
6(k
1)}；
Z
9(f)＝FFT{X
7(k
2)}；
The sampling function Z that step SS34 obtains described step SS33
8f () carries out FFT computing, ask for phasor amplitude, i.e. P
8(f)=| Z
8(f) |
2;
Step SS35 asks for sampling function Z
8frequency during (f) maximum amplitude, namely
f
-maxpower＝{f|P
8(f
-maxpower)＝max(P
8(f))}；
Step SS36 asks for frequency f
-maxpowerz time maximum
8(f) and Z
9the phase differential of (f), namely
Delta(f
-maxpower)＝phase{Z
8(f
-maxpower)}-phase{Z
9(f
-maxpower)}；
Step SS37 finally carries out frequency correction, and the frequency after correction is:
f＝f
-maxpower+Delta(f
-maxpower)/256。
The beneficial effect that the present invention reaches: the present invention, from the SV sampling value message of IEC61850-9-2, uses rectangular window to intercept some data of the synchronous passage of pulse per second (PPS), by the ceiling capacity frequency of search data, calculates passage power frequency approximate value; Achieve the phase information after by raw data series of transformations, calculate the corrected value of passage power frequency, finally obtain the function of the high-accuracy voltage power frequency value of passage.
Accompanying drawing explanation
Fig. 1 is signal wiring schematic diagram of the present invention.
Fig. 2 is the method flow diagram of an embodiment of a kind of high-accuracy voltage power frequency measuring method based on intelligent substation of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described.Following examples only for technical scheme of the present invention is clearly described, and can not limit the scope of the invention with this.
Fig. 1 is signal wiring schematic diagram of the present invention, the present invention proposes a kind of high-accuracy voltage power frequency measuring system based on intelligent substation, it is characterized in that, comprise primary equipment, secondary device, processor DSP, described primary equipment is connected with described secondary device, and described secondary device is connected with described processor DSP, described secondary device comprises electronic type voltage transformer, electronic current mutual inductor, A/D Acquisition Circuit, merge cells device, described electronic type voltage transformer is connected with the output terminal of described primary equipment respectively with the input end of described electronic current mutual inductor, described electronic type voltage transformer is connected with the input end of described A/D Acquisition Circuit respectively with the output terminal of described electronic current mutual inductor, the output terminal of described A/D Acquisition Circuit is connected with the input end of described merge cells device, the output terminal of described merge cells device is connected with the input end of described processor DSP.
The principle of work of a kind of high-accuracy voltage power frequency measuring system based on intelligent substation of the present invention is: alternating voltage and the alternating current of being measured the circuit of primary equipment by electronic type voltage transformer and electronic current mutual inductor respectively, then the alternating voltage recorded or current signal is converted to voltage signal within 5V, and then carry out low-pass filtering by A/D acquisition circuit, analog to digital conversion, by the digital signal access merge cells device after AD conversion, the signal on each road carries out merging and encapsulating by merge cells device, then input processor DSP carries out frequency computation part.
Fig. 2 is the method flow diagram of an embodiment of a kind of high-accuracy voltage power frequency measuring method based on intelligent substation of the present invention, if the periodic sampling points N of each power frequency, the present embodiment N=80, represent that each power frequency period is sampled 80 points, the default frequency of system is 50Hz, thus sampling interval △ T=0.25ms; Each sampled value buffer area clear 0; Arrange and receive sampled data array a1 [767], a2 [255], a3 [255]; The each field planting of initialization and and configuration parameter, as channel factor and the voltage channel for frequency measurement.
Advanced row data sampling, obtain new data, and voltage sample value is deposited array a1 [767], the new data window of acquisition is multiplied by Hanning window function and deposits back a1 [767] array, then by the data 0 ~ 511 in a1 [767] array with 255 data for symcenter carries out being added (a1 [0]+a1 [511]; A1 [1]+a1 [510]; A1 [2]+a1 [509] ...), by the data that newly obtain stored in array a2 [255].Data 256 ~ 767 in a1 array with 512 for symcenter carries out being added (a1 [256]+a1 [767]; A1 [257]+a1 [766]; A1 [258]+a1 [764] ...), by the data that newly obtain stored in array a3 [255].
Utilize the data of FFT to new array a2 [255] to carry out Fourier transform and obtain Z respectively
8(f)=FFT{X
6(k) }, the data of a3 [256] are carried out Fourier transform and are obtained Z respectively
9(f)=FFT{X
7(k) }.
A2 [255] array obtains the frequency f in data corresponding to maximum amplitude after Fourier transform
-maxpower={ f|P
8(f
-maxpower)=max (P
8(f)) }; F in a3 [255] after Fourier transform
-maxpowercorresponding phase value, with the f after Fourier transform in a2 [255]
-maxpowerphase differential is obtained after corresponding phase value subtracts each other
Delta (f
-maxpower)=phase{Z
8(f
-maxpower-phase{Z
9(f
-maxpower); Finally carry out frequency correction, the frequency f after correction is: f=f
-maxpower+ Delta (f
-maxpower)/256.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the prerequisite not departing from the technology of the present invention principle; can also make some improvement and distortion, these improve and distortion also should be considered as protection scope of the present invention.
Claims (2)
1. based on a high-accuracy voltage power frequency measuring system for intelligent substation, it is characterized in that, comprise primary equipment, secondary device, processor DSP, described primary equipment is connected with described secondary device, and described secondary device is connected with described processor DSP, described secondary device comprises electronic type voltage transformer, electronic current mutual inductor, A/D Acquisition Circuit, merge cells device, described electronic type voltage transformer is connected with the output terminal of described primary equipment respectively with the input end of described electronic current mutual inductor, described electronic type voltage transformer is connected with the input end of described A/D Acquisition Circuit respectively with the output terminal of described electronic current mutual inductor, the output terminal of described A/D Acquisition Circuit is connected with the input end of described merge cells device, the output terminal of described merge cells device is connected with the input end of described processor DSP.
2. adopt a method for the high-accuracy voltage power frequency measuring system based on intelligent substation according to claim 1, it is characterized in that, comprise the steps:
Step SS1 passage extracts, and specifically comprises:
It is X that step SS11 sets sampling function
0(k);
Step SS12 sampling number per second is the frequency of 4000, SV signal is 50Hz, and a rectangular window function Rect () is quite taken advantage of in function sampling, and intercepting 4000 point sampling functions is X
1(k)=X
0(k) * Rect (0,3999);
Step SS2 signal condition, specifically comprises:
The sampling function X that step SS21 obtains described step SS1
1k () is sampled further, described sampling function X
1k () takes advantage of rectangular window function Rect (0,767), namely
X
2(k)=X
1(k) * Rect (0,767)=X
0(k) * Rect (0,3999) * Rect (0,767)=X
0(k) * Coef
1wherein, Coef
1be expressed as constant amount;
The sampling function X that step SS22 obtains described step SS21
2k () is further processed, described sampling function X
2k () takes advantage of Hanning window function Hanning (), namely
X
3(k)=X
2(k) * Hanning ()=X
0(k) * Coef1*Hanning ()=X
0(k) * Coef
2wherein, Coef
2be expressed as constant amount;
Step SS3 power frequency calculates, and specifically comprises:
The sampling function X that step SS31 obtains described step SS2
3k () carries out segmentation intercepting, described sampling function X
3k () takes advantage of rectangular window function Rect (), namely
X
4(k)＝X
3(k)*Rect(0,511)；
X
5(k)＝X
3(k)*Rect(256,767)；
The sampling function X that step SS32 obtains described step SS31
4(k) and X
5k () carries out overlap-add procedure respectively, namely
X
6(k
1)＝X
4(k
1)+X
4(511-k
1)(0<＝k
1<＝255)；
X
7(k
2)＝X
5(k
2)+X
5(767-k
2)(256<＝k
2<＝512)；
Step SS33 is respectively to the sampling function X that step SS32 obtains
6(k
1) and X
7(k
2) carry out FFT fast Fourier transform computing, namely
Z
8(f)＝FFT{X
6(k
1)}；
Z
9(f)＝FFT{X
7(k
2)}；
The sampling function Z that step SS34 obtains described step SS33
8f () carries out FFT computing, ask for phasor amplitude, i.e. P
8(f)=| Z
8(f) |
2;
Step SS35 asks for sampling function Z
8frequency during (f) maximum amplitude, i.e. f
-maxpower={ f|P
8(f
-maxpower)=max (P
8(f)) };
Step SS36 asks for frequency f
-maxpowerz time maximum
8(f) and Z
9the phase differential of (f), that is:
Delta(f
-maxpower)＝phase{Z
8(f
-maxpower)}-phase{Z
9(f
-maxpower)}；
Step SS37 finally carries out frequency correction, and the frequency after correction is:
f＝f
-maxpower+Delta(f
-maxpower)/256。
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| CN201610038566.2A CN105467207B (en) | 2016-01-19 | 2016-01-19 | A kind of high-accuracy voltage power frequency measuring system and method based on intelligent substation |
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| CN105467207B CN105467207B (en) | 2019-07-19 |
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2016
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| JPS6366472A (en) * | 1986-09-09 | 1988-03-25 | Nec Corp | Frequency detector |
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