CN109001504A - A kind of same source device of generator frequency signal - Google Patents
A kind of same source device of generator frequency signal Download PDFInfo
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- CN109001504A CN109001504A CN201811118295.7A CN201811118295A CN109001504A CN 109001504 A CN109001504 A CN 109001504A CN 201811118295 A CN201811118295 A CN 201811118295A CN 109001504 A CN109001504 A CN 109001504A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/28—Provision in measuring instruments for reference values, e.g. standard voltage, standard waveform
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Abstract
The invention discloses a kind of same source devices of generator frequency signal, including frequency signal conditioning module, signal sampling and processing module, input/output module and human-computer interaction module；Realize quick, the accurate measurement and pick-up of alternator output frequency signal.The present invention improves sine wave for the two-way square-wave signal of phase phase difference 180 degree, and combines the binary channels input capture ability of ARMF767 high speed, and the frequency measurement response time is shortened 10ms, ensure that the rapidity of generating set output frequency measurement.The frequency measurement data Processing Algorithm first-order filtering algorithm adaptive using improved filter factor makes frequency measurement accuracy reach 0.001Hz, ensure that the accuracy of frequency measurement while guaranteeing frequency measurement stability and sensitivity.The reliability of device frequency measurement is improved, rapidity, the accuracy and reliability of generating set output frequency measurement can be substantially increased, ensure that the economic stability operation of fired power generating unit.
Description
Technical field
The present invention relates to generator electrical quantities measurement technical fields, and in particular to there is one kind measurement accuracy height, output to ring
Answer the fast same source device of generator frequency signal.
Background technique
The precise measurement of output voltage frequency of generator is the basis of power system stability operation and control.Many fire at present
Because the deficiency of primary frequency modulation responsive electricity grid load often results in, a wide range of examination event occurs motor group, wherein frequency modulation load responding
It is its master that it is not homologous, which to adjust the frequency measurement signal used, for the frequency signal and fired power generating unit that asynchronous, dispatching of power netwoks examination uses
Want one of reason.Grid requirements fired power generating unit Regulation dead-band is 2r/min, while the mains frequency that dispatching of power netwoks examination uses is believed
Number variation tendency will theoretically shift to an earlier date the tach signal in fired power generating unit.But many fired power generating unit tachometric surveies use magnetic resistance at present
Probe and design the number of teeth be generally 60 teeth, often occur in fired power generating unit primary frequency modulation real response frequency modulation amplitude deficiency and late
Stagnant problem, causes that actual speed feedback deviation is larger and the delay time is longer.Frequency signal is often because interference appearance is inclined simultaneously
Difference.It is above-mentioned to solve therefore, it is necessary to a kind of same source device of generator frequency signal high with measurement accuracy, output response is fast
It is insufficient.
There is the numerical frequency transmitter of independent frequency measurement currently on the market, but most of these transmitters are in signal conditioning unit
Using A/D sample circuit, and the corresponding data processing algorithm of combination calculates the frequency of sampled signal.This method is turned by A/D
The limitation of parallel operation conversion accuracy, sampling rate etc., frequency measurement accuracy is not high, the response time is long, is unable to satisfy in high precision, fastly
The homologous demand of generator frequency signal of response.
Summary of the invention
It is homologous with measurement accuracy height, the generator frequency signal of fast response time that the purpose of the present invention is to provide a kind of
Device.The device uses the quick precise measurement new method of half-wave signa frequency, can not only effectively filter out mains by harmonics, and
With frequency signal measurement accuracy high (frequency-measurement accuracy 0.001Hz), output response time short (being less than 40ms), strong antijamming capability
The characteristics of.Output voltage frequency of generator signal is realized fast and accurately to measure and pick-up.
To achieve the above object the invention adopts the following technical scheme:
A kind of same source device of generator frequency signal, including it is frequency signal conditioning module, signal sampling and processing module, defeated
Enter output module and human-computer interaction module；
The frequency signal conditioning module includes that input signal goes offline switching circuit, second-order low-pass filter circuit, voltage
Amplitude limiter circuit, zero passage hysteresis comparator circuit and optical coupling isolation circuit, the sine voltage signal for exporting generator filter out height
Subharmonic is improved as the two-way square-wave signal of phase phase difference 180 degree, is used for signal sampling and processing module；
The signal sampling in conjunction with processing module the binary channels input capture function of main control chip STM32F767 high speed and
The adaptive first-order filtering algorithm of improved filter factor, the output frequency for measuring generating set accurately and fast；
The 0-3.3V voltage that the input/output module exports main control chip STM32F767 frequency signal is believed as input
Number the module is sent by Transient Suppression Diode, it is corresponding export corresponding 4-20mA current signal and automatically adjusted for generator be
System and scheduling system use, and provide accurate, reliable frequency measurement for power plant's frequency modulation；
The human-computer interaction module is shown, system for carrying out information exchange between device and user comprising measurement result
Parameter setting, measurement calibration.
As a further solution of the present invention, the input signal of the frequency signal conditioning module switching circuit that goes offline includes
Signal isolation circuit, two-way single-pole double-throw relay and corresponding driving circuit, single-pole double-throw relay are respectively connected to two-way not
Same generator terminal voltage, the control signal issued by main control chip will wherein signal be sent into second-order low-pass filter electricity all the way
Road realizes that frequency input signal goes offline changeable function.
As a further solution of the present invention, the second-order low-pass filter circuit of the frequency signal conditioning module is for filtering out
Higher hamonic wave interference in input signal.
As a further solution of the present invention, the voltage limiter circuit of the frequency signal conditioning module and zero passage sluggishness ratio
The sine voltage signal of input is converted to compared with circuit the two-way square-wave signal of phase phase difference 180 degree, the square-wave signal of output
The period and zero crossing of period and the high-precision sine voltage signal for being equal to input of zero crossing.
As a further solution of the present invention, the optical coupling isolation circuit of the frequency signal conditioning module is by zero passage sluggishness ratio
Amplification is isolated in square-wave signal compared with circuit output, exports the two-way low and high level signal captured for main control chip STM32F767.
As a further solution of the present invention, the frequency measurement data Processing Algorithm in signal sampling and processing module uses
The adaptive first-order filtering algorithm of improved filter factor can calculate automatically sensitive according to 3 times historical data and current data
Spend coefficient.
As a further solution of the present invention, the signal input of the input/output module has electromagnetic isolation with output end
Function.
As a further solution of the present invention, the human-computer interaction module is by TFT liquid crystal color screen, indicator light and key group
At.
A kind of same source device of generator frequency signal, the adaptive first-order filtering algorithm of improved filter factor, is carrying out
Before adjustment, following judgement is first carried out:
A) whether the 3 times variation of current data is towards the same direction；
B) whether the 3 times variation of current data is very fast；
The adaptive first-order filtering algorithm of improved filter factor realizes:
A) when data quickly change, filter result can follow up (sensitivity is preferential) in time；And data variation is faster, spirit
Sensitivity should be higher；
B) when data tend towards stability, and vibrate above and below a fixed point, filter result can tend to be steady (smoothness
Preferentially).
The beneficial effects of the present invention are: (1) the device of the invention devises single-phase voltage waveform conditioning circuit, effectively filters out
Second-order low-pass filter circuit, voltage limiter circuit and the zero passage hysteresis comparator circuit of mains by harmonics, sine wave is improved as phase
The two-way square-wave signal of 180 degree is differed, and combines the binary channels input capture ability of STM32F767 high speed, when frequency measurement is responded
Between shorten 10ms, ensure that the rapidity of generating set output frequency measurement.
(2) the device of the invention frequency measurement data Processing Algorithm first-order filtering adaptive using improved filter factor
Algorithm makes frequency measurement accuracy reach 0.001Hz while guaranteeing frequency measurement stability and sensitivity, guarantees
The accuracy of frequency measurement makes the output of frequency pick-up have very high industrial utility value.
(3) there is the device of the invention frequency input signal to go offline changeable function, and frequency input signal is automatic after going offline
Another way input signal is identified, judged and switch to, input signal is simultaneously emitted by and goes offline warning message, improves the survey of device frequency
The reliability of amount.
Detailed description of the invention
Fig. 1 is the homologous structure drawing of device of generator frequency signal of the invention；
Fig. 2 is single-phase voltage waveform conditioning circuit figure of the invention；
Fig. 3 goes offline for frequency signal of the invention differentiates logic chart；
Fig. 4 is frequency measurement data Processing Algorithm flow chart of the invention.
Specific embodiment
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
Whole elaboration.
As shown in Figs. 1-2, a kind of same source device of generator frequency signal, including frequency signal conditioning module, signal sampling
With processing module, input/output module and human-computer interaction module；
The frequency signal conditioning module includes that input signal goes offline switching circuit, second-order low-pass filter circuit, voltage
Amplitude limiter circuit, zero passage hysteresis comparator circuit and optical coupling isolation circuit, the sine voltage signal for exporting generator filter out height
Subharmonic is improved as the two-way square-wave signal of phase phase difference 180 degree, is used for signal sampling and processing module；
The signal sampling in conjunction with processing module the binary channels input capture function of main control chip STM32F767 high speed and
The adaptive first-order filtering algorithm of improved filter factor, the output frequency for measuring generating set accurately and fast；
The 0-3.3V voltage that the input/output module exports main control chip STM32F767 frequency signal is believed as input
Number the module is sent by Transient Suppression Diode, it is corresponding export corresponding 4-20mA current signal and automatically adjusted for generator be
System and scheduling system use, and provide accurate, reliable frequency measurement for power plant's frequency modulation；
The human-computer interaction module is shown, system for carrying out information exchange between device and user comprising measurement result
Parameter setting, measurement calibration.
The input signal of the frequency signal conditioning module switching circuit that goes offline includes that signal isolation circuit, two-way hilted broadsword are double
Relay and corresponding driving circuit are thrown, single-pole double-throw relay is respectively connected to the different generator terminal voltage of two-way, passes through
The control signal that main control chip issues will wherein signal be sent into second-order low-pass filter circuit all the way, realizes that frequency input signal goes offline
Changeable function.Improve the reliability of device frequency measurement.
The higher hamonic wave that the second-order low-pass filter circuit of the frequency signal conditioning module is used to filter out in input signal is dry
It disturbs.The voltage limiter circuit and zero passage hysteresis comparator circuit of the frequency signal conditioning module turn the sine voltage signal of input
Turn to the two-way square-wave signal of phase phase difference 180 degree, the period of the square-wave signal of output and zero crossing it is high-precision be equal to it is defeated
The period of the sine voltage signal entered and zero crossing.
The square-wave signal that the optical coupling isolation circuit of the frequency signal conditioning module exports zero passage hysteresis comparator circuit every
From amplification, the two-way low and high level signal captured for main control chip STM32F767 is exported.
Frequency measurement data Processing Algorithm in signal sampling and processing module is adaptive using improved filter factor
First-order filtering algorithm, can be according to 3 times historical data and the automatic meter sensitivity coefficient of current data.Both it ensure that fast in frequency
When speed variation, frequency signal exports sensitivity with higher, and makes frequency in small range fluctuation, and frequency signal output has
Preferable stability ensure that the accuracy of frequency measurement, and the device frequency-measurement accuracy is made to have reached 0.001Hz.
The signal input of the input/output module has the function of electromagnetic isolation with output end.The human-computer interaction module by
TFT liquid crystal color screen, indicator light and key composition.
As shown in figure 3, going offline for frequency signal of the invention differentiates logic chart, the generator machine that main control chip passes through input
Terminal voltage signal realizes that frequency input signal goes offline changeable function, realizes device after input signal failure all the way, device
Automatic identification, wire jumper and alarm remain to correct output frequency measurement signal, improve the reliability of device frequency measurement.
As shown in figure 4, frequency measurement data Processing Algorithm flow chart of the invention, frequency measurement data Processing Algorithm is combined
The actual demands of engineering of device frequency measurement signal processing can basis using the adaptive first-order filtering algorithm of improved filter factor
3 times historical data and the automatic meter sensitivity coefficient of current data.Before being adjusted, following judgement is first carried out:
A) whether the 3 times variation of current data is towards the same direction；
B) whether the 3 times variation of current data is very fast；
The adaptive first-order filtering algorithm of improved filter factor realizes:
A) when data quickly change, filter result can follow up (sensitivity is preferential) in time；And data variation is faster, spirit
Sensitivity should be higher；
B) when data tend towards stability, and vibrate above and below a fixed point, filter result can tend to be steady (smoothness
Preferentially).
Therefore, the adaptive first-order filtering algorithm of the coefficient ensure that when frequency quickly changes, frequency signal output
Sensitivity with higher, and make frequency in small range fluctuation, frequency signal output has preferable stability.Pass through practice
It proves, which makes frequency-measurement accuracy reach 0.001Hz, ensure that the accuracy of frequency measurement, has very high industry real
With value and novelty.
In conclusion the same source device of generator frequency signal of the invention, first that the two-way of input is different generators
Set end voltage is sent into input signal and goes offline switching circuit, will wherein signal as output is sent into second-order low-pass filter circuit all the way.
After filtering out harmonic wave, fundametal compoment is sent into voltage limiter circuit and binary channels zero passage hysteresis comparator circuit, output phase difference 180
The two-way square-wave signal of degree.The amplified feeding high speed photo coupling isolation circuit of two-way square-wave signal, output is for STM32F7 identification
Low and high level signal.By the binary channels input capture and hardware filtering function of main control chip ARMF767 high speed, calculate separately
The period of the square-wave signal of two-way phase phase difference 180 degree out, interval 10ms export a frequency signal measurement data.Frequency measurement
After the adaptive first-order filtering algorithm filtering of the improved filter factor of data, as frequency signal measurement result.Input and output
Frequency signal measurement result is converted corresponding 4-20mA current signal signal by module, makes for generator automatic regulating system
With providing accurate, reliable frequency measurement for power plant's frequency modulation.Human-computer interaction module for show the devices such as measurement result and
Information exchange between user.
The above is present pre-ferred embodiments, for the ordinary skill in the art, according to the present invention
Introduction, in the case where not departing from the principle of the present invention and spirit, changes, modifications, replacement and change that embodiment is carried out
Type is still fallen within protection scope of the present invention.
Claims (9)
1. a kind of same source device of generator frequency signal, which is characterized in that including frequency signal conditioning module, signal sampling and place
Manage module, input/output module and human-computer interaction module；
The frequency signal conditioning module includes that input signal goes offline switching circuit, second-order low-pass filter circuit, voltage clipping
Circuit, zero passage hysteresis comparator circuit and optical coupling isolation circuit, it is humorous that the sine voltage signal for exporting generator filters out high order
Wave is improved as the two-way square-wave signal of phase phase difference 180 degree, is used for signal sampling and processing module；
The binary channels input capture function and improvement of signal sampling main control chip STM32F767 high speed in conjunction with processing module
The adaptive first-order filtering algorithm of filter factor, the output frequency for measuring generating set accurately and fast；
The input/output module leads to the 0-3.3V voltage that main control chip STM32F767 frequency signal exports as input signal
Cross Transient Suppression Diode and be sent into the module, it is corresponding export corresponding 4-20mA current signal for generator automatic regulating system and
Scheduling system uses, and provides accurate, reliable frequency measurement for power plant's frequency modulation；
The human-computer interaction module is shown, system parameter for carrying out information exchange between device and user comprising measurement result
Setting, measurement calibration.
2. a kind of same source device of generator frequency signal according to claim 1, which is characterized in that the frequency signal tune
The input signal of the reason module switching circuit that goes offline includes signal isolation circuit, two-way single-pole double-throw relay and corresponding driving electricity
Road, single-pole double-throw relay are respectively connected to the different generator terminal voltage of two-way, the control signal issued by main control chip
Will wherein signal is sent into second-order low-pass filter circuit all the way, realize that frequency input signal goes offline changeable function.
3. a kind of same source device of generator frequency signal according to claim 1, which is characterized in that the frequency signal tune
The second-order low-pass filter circuit of reason module is used to filter out the higher hamonic wave interference in input signal.
4. a kind of same source device of generator frequency signal according to claim 1, which is characterized in that the frequency signal tune
The sine voltage signal of input is converted phase phase difference 180 degree by the voltage limiter circuit and zero passage hysteresis comparator circuit of reason module
Two-way square-wave signal, the period of the square-wave signal of output and the high-precision sine voltage signal for being equal to input of zero crossing
Period and zero crossing.
5. a kind of same source device of generator frequency signal according to claim 1, which is characterized in that the frequency signal tune
The square-wave signal isolation amplification that the optical coupling isolation circuit of module exports zero passage hysteresis comparator circuit is managed, is exported for main control chip
The two-way low and high level signal of STM32F767 capture.
6. a kind of same source device of generator frequency signal according to claim 1, which is characterized in that signal sampling and processing
The first-order filtering algorithm that frequency measurement data Processing Algorithm in module uses improved filter factor adaptive, can be according to preceding 3
Secondary historical data and the automatic meter sensitivity coefficient of current data.
7. a kind of same source device of generator frequency signal according to claim 1, which is characterized in that the input and output mould
The signal input of block has the function of electromagnetic isolation with output end.
8. a kind of same source device of generator frequency signal according to claim 1, which is characterized in that the human-computer interaction mould
Block is made of TFT liquid crystal color screen, indicator light and key.
9. a kind of same source device of generator frequency signal according to claim 6, which is characterized in that improved filter factor
Adaptive first-order filtering algorithm first carries out following judgement before being adjusted:
A) whether the 3 times variation of current data is towards the same direction；
B) whether the 3 times variation of current data is very fast；
The adaptive first-order filtering algorithm of improved filter factor realizes:
A) when data quickly change, filter result can follow up (sensitivity is preferential) in time；And data variation is faster, sensitivity
It should be higher；
B) when data tend towards stability, and vibrate above and below a fixed point, filter result can tend to be steady, and (smoothness is excellent
First).
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|---|---|---|---|
| CN201811118295.7A CN109001504B (en) | 2018-09-26 | 2018-09-26 | Generator frequency signal homologous device |
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|---|---|---|---|
| CN201811118295.7A CN109001504B (en) | 2018-09-26 | 2018-09-26 | Generator frequency signal homologous device |
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| CN109001504A true CN109001504A (en) | 2018-12-14 |
| CN109001504B CN109001504B (en) | 2020-12-18 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111579866A (en) * | 2020-05-10 | 2020-08-25 | 哈船光电(武汉)有限公司 | Signal frequency testing method and device |
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| CN102155984A (en) * | 2010-12-30 | 2011-08-17 | 北京四方继保自动化股份有限公司 | General vibration signal measuring system of fan |
| CN104391176A (en) * | 2014-12-13 | 2015-03-04 | 华北电力大学 | Software and hardware frequency measurement circuit compatible with electric power system signals |
| CN108037359A (en) * | 2017-11-21 | 2018-05-15 | 北京智芯微电子科技有限公司 | A kind of grid frequency measurement circuit for eliminating flickering and m-Acetyl chlorophosphonazo interference |
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2018
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|---|---|---|---|---|
| CN2446299Y (en) * | 2000-09-28 | 2001-09-05 | 南海鹏 | Frequency detector of hydroturbine speed governor |
| US6944569B2 (en) * | 2003-04-01 | 2005-09-13 | Fluke Precision Measurement Ltd. | Method and apparatus for generating an electronic test signal |
| CN102155984A (en) * | 2010-12-30 | 2011-08-17 | 北京四方继保自动化股份有限公司 | General vibration signal measuring system of fan |
| CN104391176A (en) * | 2014-12-13 | 2015-03-04 | 华北电力大学 | Software and hardware frequency measurement circuit compatible with electric power system signals |
| CN108037359A (en) * | 2017-11-21 | 2018-05-15 | 北京智芯微电子科技有限公司 | A kind of grid frequency measurement circuit for eliminating flickering and m-Acetyl chlorophosphonazo interference |
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| CN111579866A (en) * | 2020-05-10 | 2020-08-25 | 哈船光电(武汉)有限公司 | Signal frequency testing method and device |
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