CN110531148A - A kind of fast frequency sampling apparatus having good transient characterisitics - Google Patents
A kind of fast frequency sampling apparatus having good transient characterisitics Download PDFInfo
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- CN110531148A CN110531148A CN201910914941.9A CN201910914941A CN110531148A CN 110531148 A CN110531148 A CN 110531148A CN 201910914941 A CN201910914941 A CN 201910914941A CN 110531148 A CN110531148 A CN 110531148A
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- 238000005070 sampling Methods 0.000 title claims abstract description 55
- 230000001052 transient effect Effects 0.000 title claims abstract description 18
- 230000003750 conditioning effect Effects 0.000 claims abstract description 16
- 230000000694 effects Effects 0.000 claims abstract description 10
- 230000003993 interaction Effects 0.000 claims abstract description 10
- 230000007704 transition Effects 0.000 claims abstract description 10
- 230000009466 transformation Effects 0.000 claims description 8
- 238000004891 communication Methods 0.000 claims description 6
- 238000005259 measurement Methods 0.000 claims description 5
- 238000000691 measurement method Methods 0.000 claims description 2
- 230000005611 electricity Effects 0.000 claims 1
- 230000007257 malfunction Effects 0.000 abstract description 3
- 238000011897 real-time detection Methods 0.000 abstract description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000035772 mutation Effects 0.000 description 1
- 230000010363 phase shift Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
- G01R19/2503—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques for measuring voltage only, e.g. digital volt meters (DVM's)
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Frequencies, Analyzing Spectra (AREA)
Abstract
The invention proposes a kind of fast frequency sampling apparatuses for having good transient characterisitics, including signal conditioning circuit, AD7606 sampling circuit, AD7606 frequency sampling circuit, frequency zero passage acquisition circuit, 32-bit microprocessor A and human-computer interaction card, the output end of the signal conditioning circuit respectively with AD7606 sampling circuit, AD7606 frequency sampling circuit, the input terminal of frequency zero passage acquisition circuit is connected, the AD7606 sampling circuit, AD7606 frequency sampling circuit, the output end of frequency zero passage acquisition circuit is connected with 32-bit microprocessor A, the 32-bit microprocessor A is connect with human-computer interaction cartoon letters.The fast frequency sampling apparatus interrupts calculating frequency using zero passage and Fast Fourier Transform (FFT) calculates frequency and carries out simultaneously, and the catastrophe of real-time detection voltage, judge whether transition effect occurs using the algorithm that frequency difference and voltage difference combine, and respective reaction is made, it can prevent malfunction from occurring.
Description
[technical field]
The present invention relates to the technical field of power measurement, especially a kind of fast frequency sampling cartridge for having good transient characterisitics
It sets.
[background technique]
The advanced frequency sampling device of Technical comparing at present is based on digital sampling, and discrete Fourier transform calculates
To frequency, and cooperate smothing filtering, the interference of extraneous instantaneous mutation signal can be filtered out.But in certain scenes, such as new energy field
Under the scenes such as stand, power grid has certain probability high-low voltage occur the transition effects such as to pass through, and the phenomenon duration is long, and operating condition is multiple
Miscellaneous, conventional art is difficult to cope with, and the measurement accuracy that may will affect frequency modulation device even results in frequency modulation system malfunction, now mentions
A kind of fast frequency sampling apparatus having good transient characterisitics out.
[summary of the invention]
The object of the invention is to solve the problems of the prior art, a kind of fast frequency for there are good transient characterisitics is proposed
Sampling apparatus, can provide reliable and stable output for station, and frequency modulation system caused by the transition effect for avoiding high-low pressure from passing through is missed
Movement, makes the reliable and stable operation of the frequency modulation system of power plant.
To achieve the above object, the invention proposes a kind of fast frequency sampling apparatuses for having good transient characterisitics, including
Signal conditioning circuit, AD7606 sampling circuit, AD7606 frequency sampling circuit, frequency zero passage acquisition circuit, 32-bit microprocessor A
With human-computer interaction card, the output end of the signal conditioning circuit respectively with AD7606 sampling circuit, AD7606 frequency sampling circuit,
The input terminal of frequency zero passage acquisition circuit is connected, the AD7606 sampling circuit, AD7606 frequency sampling circuit, frequency zero passage
The output end of acquisition circuit is connected with 32-bit microprocessor A, and the 32-bit microprocessor A is connect with human-computer interaction cartoon letters.
Preferably, the human-computer interaction card includes man-machine interface, communication interface and 32-bit microprocessor B, it is described man-machine
Interface is connected with communication interface and 32-bit microprocessor B respectively.
Preferably, the signal conditioning circuit as first passage, the three-phase voltage of second channel, three-phase current it is defeated
Enter end, three-phase voltage, three-phase current respectively by signal conditioning circuit input AD7606 frequency sampling circuit, by fixed frequency sampling into
Enter 32-bit microprocessor A.
Preferably, frequency value F a is calculated by Fourier transformation in the 32-bit microprocessor A, frequency value F a is gone together
Step tracking AD7606 sampling circuit, AD7606 sampling circuit data enter 32-bit microprocessor A, 32-bit microprocessor A are calculated
Obtain each phase voltage Ua, Ub, Uc.
Preferably, the signal conditioning circuit is calculated through overfrequency zero passage acquisition circuit into 32-bit microprocessor A
Obtain frequency value F b, when non-transient phenomenon, Fa is equal with Fb numerical value, device output frequency value Fa.
Preferably, when power grid fluctuates, when there is transition effect, the measurement method of the fast frequency sampling apparatus
Are as follows: assuming that it is Fb1 that zero passage, which interrupts the upper frequency values measured, current frequency value is Fb2；Fourier transformation is calculated currently
Frequency value F a2；A upper measured value for each phase voltage is Ua1, Ub1, Uc1, current value Ua2, Ub2, Uc2；It calculates in zero passage
Disconnected jitter values Ft=| Fb1-Fb2 |；Calculate two kinds of frequency difference Fx=| Fa2-Fb2 |；Calculate the jitter values Uat of A phase voltage
=| Ua1-Ua2 |；Ubt, Uct is similarly calculated；
Work as Ft, Fx, Uat, Ubt, when Uct meets following Rule of judgment, device pause, which refreshes, exports new frequency values, keeps
The last time frequency values of measurement are exported；After transition effect disappears, continue to restore normally to export；
Rule of judgment are as follows: at least one of Uat, Ubt, Uct are greater than the empirical value Uconst of test gained voltage, and
Empirical value Fconst1, Fx that Ft is greater than test gained jitter values are greater than the empirical value Fconst2 of test gained frequency difference, this
When meet condition.
Beneficial effects of the present invention: the present invention is interrupted using zero passage calculates frequency and Fast Fourier Transform (FFT) calculating calculating frequency
Rate carries out simultaneously, and the catastrophe of real-time detection voltage, judges transient state using the algorithm that frequency difference and voltage difference combine
Whether phenomenon occurs, and makes respective reaction, can prevent malfunction from occurring.
Feature and advantage of the invention will be described in detail by embodiment combination attached drawing.
[Detailed description of the invention]
Fig. 1 is a kind of functional block diagram for the fast frequency sampling apparatus for having good transient characterisitics of the present invention；
Fig. 2 is the logical circuitry of Rule of judgment in the present invention, wherein Uconst, and Fconst1, Fconst2 are test institute
The empirical value obtained.
[specific embodiment]
A kind of fast frequency sampling apparatus having good transient characterisitics of the invention refering to fig. 1, including signal conditioning circuit 1,
AD7606 sampling circuit 2, AD7606 frequency sampling circuit 3, frequency zero passage acquisition circuit 4,32-bit microprocessor A5 and man-machine friendship
Mutually card, the output end of the signal conditioning circuit 1 respectively with AD7606 sampling circuit 2, AD7606 frequency sampling circuit 3, frequency
The input terminal of zero passage acquisition circuit 4 is connected, the AD7606 sampling circuit 2, AD7606 frequency sampling circuit 3, frequency zero passage
The output end of acquisition circuit 4 is connected with 32-bit microprocessor A5, and the 32-bit microprocessor A5 and human-computer interaction cartoon letters connect
It connects.The human-computer interaction card includes man-machine interface 6, communication interface 7 and 32-bit microprocessor B8, the man-machine interface 6 respectively with
Communication interface 7 is connected with 32-bit microprocessor B8.
The course of work of the present invention:
Signal conditioning circuit 1 inputs AD7606 frequency sampling circuit 3, enters 32-bit microprocessor A5 by fixed frequency sampling.
Frequency value F a is calculated by Fourier transformation in the 32-bit microprocessor A5, and frequency value F a, which desynchronizes, tracks AD7606 sampling
Circuit 2,2 data of AD7606 sampling circuit enter 32-bit microprocessor A5, and each phase voltage is calculated in 32-bit microprocessor A5
Ua, Ub, Uc.Frequency is calculated into 32-bit microprocessor A5 through overfrequency zero passage acquisition circuit 4 in the signal conditioning circuit 1
Rate value Fb, in normal conditions, when non-transient phenomenon, Fa is equal with Fb numerical value, device output frequency value Fa.
When power grid fluctuates, when there is high-low voltage and the transition effects such as passing through, voltage magnitude can fluctuation, or even hair
Raw phase shift.At this point, the frequency that zero passage is interrupted and Fourier transformation measures has and substantially jumps, the stability of frequency modulation system is influenced.
Assuming that it is Fb1 that zero passage, which interrupts the upper frequency values measured, current frequency value is Fb2；Fourier transformation calculates
To current frequency value Fa2；A upper measured value for each phase voltage is Ua1, Ub1, Uc1, current value Ua2, Ub2, Uc2；It calculates
The jitter values Ft=that zero passage is interrupted | Fb1-Fb2 |；Calculate two kinds of frequency difference Fx=| Fa2-Fb2 |；Calculate the bounce of A phase voltage
Value Uat=| Ua1-Ua2 |；Ubt, Uct is similarly calculated；
Work as Ft, Fx, Uat, when Ubt, Uct meet Rule of judgment as shown in Figure 2, device pause, which refreshes, exports new frequency
Value keeps the frequency values of last measurement to be exported；After transition effect disappears, continue to restore normally to export；
Rule of judgment are as follows: at least one of Uat, Ubt, Uct are greater than the empirical value Uconst of test gained voltage, and
Empirical value Fconst1, Fx that Ft is greater than test gained jitter values are greater than the empirical value Fconst2 of test gained frequency difference, this
When meet condition.
Above-described embodiment is the description of the invention, is not limitation of the invention, after any pair of simple transformation of the present invention
Scheme all belong to the scope of protection of the present invention.
Claims (6)
1. a kind of fast frequency sampling apparatus for having good transient characterisitics, it is characterised in that: including signal conditioning circuit (1),
AD7606 sampling circuit (2), AD7606 frequency sampling circuit (3), frequency zero passage acquisition circuit (4), 32-bit microprocessor A (5)
It is adopted respectively with AD7606 sampling circuit (2), AD7606 frequency with the output end of human-computer interaction card, the signal conditioning circuit (1)
Sample circuit (3), frequency zero passage acquisition circuit (4) input terminal be connected, the AD7606 sampling circuit (2), AD7606 frequency
Sampling circuit (3), frequency zero passage acquisition circuit (4) output end be connected with 32-bit microprocessor A (5), 32 micro- places
Reason device A (5) is connect with human-computer interaction cartoon letters.
2. a kind of fast frequency sampling apparatus for having good transient characterisitics as described in claim 1, it is characterised in that: the people
Machine interaction card includes man-machine interface (6), communication interface (7) and 32-bit microprocessor B (8), the man-machine interface (6) respectively with lead to
Communication interface (7) is connected with 32-bit microprocessor B (8).
3. a kind of fast frequency sampling apparatus for having good transient characterisitics as described in claim 1, it is characterised in that: the letter
Number conditioning circuit (1) as first passage, the three-phase voltage of second channel, three-phase current input terminal, three-phase voltage, three-phase electricity
Stream inputs AD7606 frequency sampling circuit (3) by signal conditioning circuit (1) respectively, enters 32-bit microprocessor by fixed frequency sampling
A(5)。
4. a kind of fast frequency sampling apparatus for having good transient characterisitics as claimed in claim 3, it is characterised in that: described 32
Frequency value F a is calculated by Fourier transformation in bit microprocessor A (5), and frequency value F a, which desynchronizes, tracks AD7606 sampling circuit
(2), AD7606 sampling circuit (2) data enter 32-bit microprocessor A (5), and each phase is calculated in 32-bit microprocessor A (5)
Voltage Ua, Ub, Uc.
5. a kind of fast frequency sampling apparatus for having good transient characterisitics as claimed in claim 4, it is characterised in that: the letter
Frequency value F b, nothing is calculated into 32-bit microprocessor A (5) through overfrequency zero passage acquisition circuit (4) in number conditioning circuit (1)
When transition effect, Fa is equal with Fb numerical value, device output frequency value Fa.
6. a kind of fast frequency sampling apparatus for having good transient characterisitics as claimed in claim 5, it is characterised in that: work as power grid
It fluctuates, when there is transition effect, the measurement method of the fast frequency sampling apparatus are as follows: assuming that zero passage interrupts upper one measured
A frequency values are Fb1, and current frequency value is Fb2；Current frequency value Fa2 is calculated in Fourier transformation；Upper the one of each phase voltage
A measured value is Ua1, Ub1, Uc1, current value Ua2, Ub2, Uc2；Calculate the jitter values Ft=that zero passage is interrupted | Fb1-Fb2 |；
Calculate two kinds of frequency difference Fx=| Fa2-Fb2 |；Calculate the jitter values Uat=of A phase voltage | Ua1-Ua2 |；Similarly it is calculated
Ubt, Uct；
Work as Ft, Fx, Uat, Ubt, when Uct meets following Rule of judgment, device pause, which refreshes, exports new frequency values, keeps upper one
The frequency values of secondary measurement are exported；After transition effect disappears, continue to restore normally to export；
Rule of judgment are as follows: at least one of Uat, Ubt, Uct are greater than the empirical value Uconst of test gained voltage, and Ft is big
It is greater than the empirical value Fconst2 of test gained frequency difference in empirical value Fconst1, Fx of test gained jitter values, it is full at this time
Sufficient condition.
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| CN107219432A (en) * | 2017-07-26 | 2017-09-29 | 武汉理工大学 | Watercraft electric propulsion system power quality detection method and detection means |
| CN109946545A (en) * | 2019-03-29 | 2019-06-28 | 国网山西省电力公司电力科学研究院 | A kind of multifunctional electric energy mass analysis method and system |
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