CN107167757A - A kind of method for checking electronic transducer and system using improvement digital filtering algorithm - Google Patents
A kind of method for checking electronic transducer and system using improvement digital filtering algorithm Download PDFInfo
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- CN107167757A CN107167757A CN201710554904.2A CN201710554904A CN107167757A CN 107167757 A CN107167757 A CN 107167757A CN 201710554904 A CN201710554904 A CN 201710554904A CN 107167757 A CN107167757 A CN 107167757A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/02—Testing or calibrating of apparatus covered by the other groups of this subclass of auxiliary devices, e.g. of instrument transformers according to prescribed transformation ratio, phase angle, or wattage rating
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Abstract
Invention provides a kind of using the method for checking electronic transducer and system that improve digital filtering algorithm, comprises the following steps：1) synchronous acquisition electronic mutual inductor to be measured and analog quantity turn the sampled data of digital quantity system；2) digital filtering processing is carried out to the sampled data using improvement digital filtering algorithm；3) fundamental component of the sampled data is extracted respectively using zero crossing detection；4) frequency, the phase and amplitude of the sampled data are obtained respectively according to phase difference method；5) phase error, current error, voltage error and the A class uncertainties of electronic mutual inductor to be measured are calculated according to the frequency, the phase and the amplitude.The present invention greatly reduces the influence of bursty interference in terms of data processing, and the accuracy of verification is high, in the absence of delay phenomenon, can solve the technical problem that effect is poor, accuracy is low verified in the prior art.
Description
Technical field
It is especially a kind of using the electricity for improving digital filtering algorithm the invention belongs to electrotechnical instrument and meter power calibration field
Minor transducer check method and system.
Background technology
Electronic mutual inductor is by being connected to the one or more voltages or current sensor of Transmission system and two times transfer device
Composition, to transmit the measured amount that is proportional to, supply measuring instrument, instrument and relay protection or control device.Electronic type is mutual
Sensor is mainly used in the detection examination of the electric parameter metering of power system and the electric equipment of all kinds of inputs or output frequency conversion electricity
Test with efficiency evaluation and test, be one of digitlization, intelligentized key equipment in intelligent grid.At present due to electronic mutual inductor can
It is also to be improved by property and stability, cause electronic mutual inductor run time fault rate higher, have become it in power system
The bottleneck of middle application.In standard GB/T/T20840.7-2007《Electronic type voltage transformer》And GB/T20840.8-2007
《Electronic current mutual inductor》Middle regulation, the electronic mutual inductor of digital transformer substation application is a kind of analog input digital quantity
The non-traditional transformer of output.But it is that electronic mutual inductor is also responsible for the accurate measurement of power network with traditional transformer identical,
And the substantial responsibility such as malfunction monitoring.Therefore the verification to electronic mutual inductor, accurately examines and determine its error range, with very heavy
The meaning wanted.
At present, based on the degree of accuracy verification of electronic mutual inductor is main in the conventional way, i.e., marked with the tradition containing iron core
Quasi- transformer is realized to different size rated primary voltage electric current as standard source by way of to iron core tapping lead
Measurement, and by the analog-to-digital conversion module inside electronic transducer calibration instrument, convert analog signals into data signal, then
The data signal contrast that itself and tested electronic mutual inductor are exported, finally draws error and phase difference using differential technique analysis
According to.
There is ferromagnetic resonance using the verification mode of iron core type standard mutual inductor above and ferromagnetic saturation defect, increase-volume are stranded
Difficult, secondary connection is cumbersome and second open circuit is the problems such as Keep Clear-High Voltage, causes that its effect to checking electronic type transformers is poor, standard
True property is low.Meanwhile, traditional method of calibration is based primarily upon differential technique principle, i.e., by standard mutual inductor and by school electronic mutual inductor
Simulation output makes the difference, then difference signal progress is handled obtain than difference and angular difference.Compared with standard mutual inductor simulation output, electronics
The numeral output of formula transformer is discrete series, therefore, be would become hard to again with differential technique if converting digital signals into analog signal
Meet accuracy requirement.Further, since there is delay phenomenon in the secondary device and primary side of numeral output electronic mutual inductor, because
This, relatively large deviation can be caused by directly directly making the difference two paths of signals, reduce further the accuracy of verification.
The content of the invention
It is an object of the invention to overcome the deficiencies in the prior art part, there is provided a kind of use improvement digital filtering algorithm
Method for checking electronic transducer and system, to solve the technical problem that effect is poor, accuracy is low verified in the prior art.
The present invention solves its technical problem and takes following technical scheme to realize：
A kind of method for checking electronic transducer using improvement digital filtering algorithm, it is characterised in that：Including following step
Suddenly：
(1) synchronous acquisition electronic mutual inductor to be measured and analog quantity turn the sampled data of digital quantity system；
(2) digital filtering processing is carried out to the sampled data using improvement digital filtering algorithm, and export the numeral filter
Ripple processing data；
(3) the fundamental component of the sampled data is extracted respectively using zero crossing detection；
(4) frequency, the phase and amplitude of the sampled data are obtained respectively according to phase difference method；
(5) phase error, the electric current of electronic mutual inductor to be measured are calculated according to the frequency, the phase and the amplitude
Error, voltage error and A class uncertainties.
Moreover, the step (2) middle improvement digital filtering algorithm, step is：
1. a queue for accommodating N number of data is set up；
2. the sampled data is inputted into the queue, and judges whether the queue is full；
If 3. the queue less than, the sampled data is exported, and repeat judge the queue whether full step
Suddenly；
If 4. the queue is full, the maximum and minimum value in the queue are removed, and ask for remaining (N-2) number
According to arithmetic mean of instantaneous value, the arithmetic mean of instantaneous value is exported, and repeat judge the queue whether full step.
If moreover, (2) the step is improved in digital filtering algorithm, 4. the queue is full, and step includes：
A sorts to the sampled data according to bubble sort method；
B stores maximum and minimum value in the queue.
Moreover, the specific method of the step a is：For an array for having N number of data, since the first number from
Head compares two-by-two to tail, when previous number is bigger than latter number, then exchanges their position, until a maximum number is arranged
In the rear tail of array；Then last number is fixed, it is no longer necessary to compared, it is only necessary to before repeating to compare according to the method described above
N-1 numbers, until discharge order.
A kind of electronic type transformer checking system using improvement digital filtering algorithm, it is characterised in that：Including：
Sampled data acquisition module, the sampled data acquisition module is used for synchronous acquisition electronic mutual inductor to be measured and mould
Analog quantity turns the sampled data of digital quantity system；
Digital filtering processing module, the digital filtering processing module is used to adopt to described using improvement digital filtering algorithm
Sample data carry out digital filtering processing；
Fundamental component extraction module, the fundamental component extraction module is used to extract described respectively using zero crossing detection
The fundamental component of sampled data；
Frequency, phase and amplitude acquisition module, the frequency, phase and amplitude acquisition module are used for according to phase difference method point
Frequency, the phase and amplitude of the sampled data are not obtained；
Phase error, current error, voltage error and A class uncertainty calculation modules, the phase error, electric current are missed
Difference, voltage error and class uncertainty calculation module are used to calculate electricity to be measured according to the frequency, the phase and the amplitude
Phase error, current error, voltage error and the A class uncertainties of minor transformer.
Moreover, the digital filtering processing module includes queue setting up submodule, queue input being linked in sequence successively
Module, sampled data output sub-module and arithmetic mean of instantaneous value output sub-module：
Queue setting up submodule, the queue setting up submodule is used to set up a queue for accommodating N number of data；
Queue input submodule, the queue input submodule is used to the sampled data inputting the queue, and sentences
Whether the queue of breaking is full；
Sampled data output sub-module, the sampled data output sub-module be used for when the queue less than when, will be described
Sampled data export, and repeat judge the queue whether full step；
Arithmetic mean of instantaneous value output sub-module, the arithmetic mean of instantaneous value output sub-module is used to, when the queue is expired, go
Except the maximum and minimum value in the queue, and the arithmetic mean of instantaneous value of remaining N-2 data is asked for, by the arithmetic mean of instantaneous value
Output, and repeat judge the queue whether full step.
Moreover, the digital filtering processing module includes the sampled data sorting sub-module being connected with each other and storage submodule
Block,
The sampled data order module is used to sort to the sampled data according to bubble sort method；
The sub-module stored is used to store maximum and minimum value in the queue.
Advantages and positive effects of the present invention are：
1st, the present invention provides a kind of using the method for checking electronic transducer for improving digital filtering algorithm, the electronic type
Transducer check method includes synchronous acquisition electronic mutual inductor to be measured and analog quantity turns the sampled data of digital quantity system；Using
Improve digital filtering algorithm and digital filtering processing is carried out to the sampled data；Extract described adopt respectively using zero crossing detection
The fundamental component of sample data；Obtain frequency, the phase and amplitude of the sampled data respectively according to phase difference method；According to the frequency
Rate, the phase and the amplitude calculate phase error, current error, voltage error and the A classes of electronic mutual inductor to be measured not
Degree of certainty.
2nd, the present invention is based on the absolute method of measurement, and acquisition electronic mutual inductor to be measured synchronous first and analog quantity turn digital quantity system
The sampled data of system, i.e., in synchronization, obtain analog quantity and turn digital quantity system and the electricity to be measured numeral of formula transformer respectively
Output signal, and directly enter the comparison of line frequency, amplitude and phase to the digital output signal.Different from differential technique, we
Method is directly digitized sampling to analog signal, is compared again without converting digital signals into analog signal, and right
Sampled data carries out digital filtering processing, greatly reduces the influence of bursty interference, and the accuracy of verification is high, real-time, no
In the presence of delay phenomenon.Therefore, the present invention can solve the technical problem that effect is poor, accuracy is low verified in the prior art.
Brief description of the drawings
Fig. 1 is the flow chart of method of calibration in the embodiment of the present invention；
Fig. 2 is the step S02 provided in the embodiment of the present invention flow chart；
Fig. 3 is the step S204 provided in the embodiment of the present invention flow chart；
Fig. 4 is the structural representation of check system in the embodiment of the present invention；
Fig. 5 is the structural representation of the digital filtering processing module provided in the embodiment of the present invention；
Fig. 6 is the structural representation of the arithmetic mean of instantaneous value output sub-module provided in the embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawings and the invention will be further described by specific embodiment, following examples are descriptive
, it is not limited, it is impossible to which protection scope of the present invention is limited with this.
Each embodiment in this specification is described by the way of progressive, identical similar portion between each embodiment
Divide mutually referring to what each embodiment was stressed is the difference with other embodiments.
A kind of method for checking electronic transducer using improvement digital filtering algorithm,
The flow chart that Fig. 1 show the embodiment of the present invention is refer to, it is a kind of using improvement digital filtering algorithm as shown in Figure 1
Method for checking electronic transducer, it is described using improve digital filtering algorithm method for checking electronic transducer include it is following
Step：
S01：Synchronous acquisition electronic mutual inductor to be measured and analog quantity turn the sampled data of digital quantity system；
S02：Digital filtering processing is carried out to the sampled data using digital filtering algorithm is improved, and exports the numeral
Filtering process data；
S03：Extract the fundamental component of the sampled data respectively using zero crossing detection；
S04：Obtain frequency, the phase and amplitude of the sampled data respectively according to phase difference method；
S05：Phase error, the electricity of electronic mutual inductor to be measured are calculated according to the frequency, the phase and the amplitude
Stream error, voltage error and A class uncertainties.
Generally, the input signal of verification standard source is in addition to containing fundametal compoment, also containing higher harmonic components and white noise
Typically there are two aspects in sound etc., the source of interference volume, and one is the higher hamonic wave of power system, and one is the electromagnetic interference of environment and makes an uproar
Acoustic jamming.Check system design interference protection measure mainly includes portion link shielding, system earth, acquisition circuit design low pass filtered
The interference protection measures such as ripple device.Therefore, the steps necessary that digital filtering processing is checking electronic type transformers is carried out to sampled data,
Digital filtering processing is conducive to improving checking precision.The improvement digital filtering algorithm provided in the present embodiment is filtered in sliding average
Improved, be more applicable on the basis of ripple algorithm, arithmetic mean of instantaneous value filter method and anti-impulse disturbances average filter method
Specific temperature data collecting system.
The present embodiment extracts the fundamental component of the sampled data using the zero crossing detection of similar triangle theory, should
Method requires that waveform has to pass through digital filtering processing, and zero crossing could accurately be differentiated by filtering out the interference of direct current harmonic, then
10 computation of Period frequencies as defined in adopting international standards make Estimation of Mean.
It is specific that the utilization phase difference method provided in the present embodiment obtains the frequency of the sampled data, phase and amplitude respectively
For：
Analyze the parameter of each harmonic respectively using interpolated FFT algorithm, specific formula is as follows：
Can be derived from the amplitude of signal, the value of phase and frequency is respectively：
fm=m (k1+δ1)fs/N
M is overtone order in formula, and fs is sample frequency, and km is the corresponding discrete frequency of harmonic signal sample sequence, and δ m are
Frequency spectrum deviates estimate, and 0≤δ m≤1, XH are sampled point, and WH is rectangular window.
In the present embodiment, the phase of electronic mutual inductor to be measured is calculated according to the frequency, the phase and the amplitude
Error, current error, voltage error and A class uncertainties are specially：
Phase error phi e：φ e=φ-(φ or+2 π ftdr)
In formula, φ is phase difference, and φ or are for electronic mutual inductor because the nominal phase that technology is produced is poor, and f is frequency, tdr
For the rated value the time required to data processing and transmission.
Current error ε i：
It is specified change in formula, is signal ource electric current, under being measuring condition, actual secondary current during application.
Voltage error ε u：
It is rated voltage ratio in formula, is signal source voltage, under being measuring condition, actual secondary voltage during application.
A class uncertainties：
In formula, x is the voltage/current value of measurement, and n-1 is the free degree.
The present invention is based on the absolute method of measurement, and acquisition electronic mutual inductor to be measured synchronous first and analog quantity turn digital quantity system
Sampled data, i.e., in synchronization, analog quantity is obtained respectively and turns the digital defeated of digital quantity system and electricity formula transformer to be measured
Go out signal, and directly enter the comparison of line frequency, amplitude and phase to the digital output signal.Different from differential technique, this method
Sampling is directly digitized to analog signal, is compared again without converting digital signals into analog signal, and to adopting
Sample data carry out digital filtering processing, greatly reduce the influence of bursty interference, and the accuracy of verification is high, real-time, does not deposit
In delay phenomenon.Therefore, the present invention can solve the technical problem that effect is poor, accuracy is low verified in the prior art.
It refer to the flow chart that Fig. 2 show the step S02 provided in the embodiment of the present invention；
The digital filtering algorithm that improves includes setting up a queue for accommodating N number of data as shown in Figure 2；By the sampling
Queue described in data input, and judge whether the queue is full；If the queue less than, the sampled data is exported,
And repeat judge the queue whether full step；If the queue is full, maximum in the queue and most is removed
Small value, and the arithmetic mean of instantaneous value of remaining N-2 data is asked for, the arithmetic mean of instantaneous value is exported, and repeat to judge the queue
Whether full step.
It refer to the flow chart that Fig. 3 show the step S204 provided in the embodiment of the present invention；
Improvement digital filtering algorithm in step S02, including the sampled data is sorted according to bubble sort method, so
Afterwards, maximum and minimum value in the queue are stored.
The present invention carries out digital filtering processing, the digital filtering after improvement using improvement digital filtering algorithm to sampled data
Algorithm to the effect that first sets up a queue, so as to realize real-time output, that is to say, that often come in a data just
A data can be exported at once, can so ensure the real-time and rapidity of data, it is to avoid in pure method of arithmetical average
Central appearance to gather multiple data could filter output one data situation.
After queue full, hot target temperature constantly rises, and comes in also abandon one most while a new data every time
The data of " old " so that whole queue remains fixed length.
Whether be maximum or minimum value, be filtered algorithm if this data is judged after a data of often coming in
When remove maximum and minimum value first, give tacit consent to the two values for interference value, first had to when carrying out algorithm in the N number of of input
Maximum Xmax and minimum value Xmin is removed in sampled data Xi (i=1~N), y is found by N-2 sampled data after removal,
Make the sum of square of deviations minimum between y and each sampled value, its formula is：
By taking extreme value to draw above formula, i.e. the algorithmic formula of arithmetic mean of instantaneous value.This method is N-2 sampled value
It is added, then takes its arithmetic mean of instantaneous value for this sampled value and export.
Then remaining data using arithmetic mean method filter, by after calculating with regard to one can be exported after filtering after number
According to.
Refer to Fig. 4 show provided in the embodiment of the present invention it is a kind of using improve digital filtering algorithm electronic type it is mutual
The structural representation of sensor check system.
It is described as shown in Figure 4 to be included using the electronic type transformer checking system for improving digital filtering algorithm：
Sampled data acquisition module, the sampled data acquisition module is used for synchronous acquisition electronic mutual inductor to be measured and mould
Analog quantity turns the sampled data of digital quantity system；
Digital filtering processing module, the digital filtering processing module is used to adopt to described using improvement digital filtering algorithm
Sample data carry out digital filtering processing；
Fundamental component extraction module, the fundamental component extraction module is used to extract described respectively using zero crossing detection
The fundamental component of sampled data；
Frequency, phase and amplitude acquisition module, the frequency, phase and amplitude acquisition module are used for according to phase difference method point
Frequency, the phase and amplitude of the sampled data are not obtained；
Phase error, current error, voltage error and A class uncertainty calculation modules, the phase error, electric current are missed
Difference, voltage error and A class uncertainty calculations module are used to calculate electricity to be measured according to the frequency, the phase and the amplitude
Phase error, current error, voltage error and the A class uncertainties of minor transformer.
Fig. 5 is refer to, the structural representation of the digital filtering processing module provided in the embodiment of the present invention is provided.
Fig. 5 understands that the digital filtering processing module includes:
Queue setting up submodule, the queue setting up submodule is used to set up a queue for accommodating N number of data；
Queue input submodule, the queue input submodule is used to the sampled data inputting the queue, and sentences
Whether the queue of breaking is full；
Sampled data output sub-module, the sampled data output sub-module be used for when the queue less than when, will be described
Sampled data export, and repeat judge the queue whether full step；
Arithmetic mean of instantaneous value output sub-module, the arithmetic mean of instantaneous value output sub-module is used to, when the queue is expired, go
Except the maximum and minimum value in the queue, and the arithmetic mean of instantaneous value of remaining N-2 data is asked for, by the arithmetic mean of instantaneous value
Output, and repeat judge the queue whether full step.
The structural representation of the arithmetic mean of instantaneous value output sub-module provided in the embodiment of the present invention is provided with reference to Fig. 6.
As shown in Figure 6, sampled data sorting sub-module, the sampled data order module is used to press the sampled data
According to the sequence of bubble sort method；Sub-module stored, the sub-module stored is used to store maximum and minimum value in the queue.
Invention described above embodiment, is not intended to limit the scope of the present invention..It is any in the present invention
Spirit and principle within the modifications, equivalent substitutions and improvements made etc., should be included in the scope of the protection.
Each embodiment in this specification is described by the way of progressive, identical similar portion between each embodiment
Divide mutually referring to what each embodiment was stressed is the difference with other embodiment.Especially, for device or
For system embodiment, because it is substantially similar to embodiment of the method, so describing fairly simple, related part is referring to method
The part explanation of embodiment.Apparatus and system embodiment described above is only schematical, wherein the conduct
The unit that separating component illustrates can be or may not be it is physically separate, the part shown as unit can be or
Person may not be physical location, i.e., can be located at a place, or can also be distributed on multiple NEs.Can root
Some or all of module therein is factually selected to realize the purpose of this embodiment scheme the need for border.This area
Those of ordinary skill without creative efforts, that is, is appreciated that and implemented.
It should be appreciated that the present invention can be used in numerous general or special purpose computing system environments or configuration.For example it is individual
People's computer, server computer, handheld device or portable set, laptop device, multicomputer system, based on microprocessor
The system of device, set top box, programmable consumer-elcetronics devices, network PC, minicom, mainframe computer including to take up an official post
DCE of what system or equipment etc..
The present invention can be described in the general context for the instruction that can perform by computer, such as program module.Typically
Ground, program module includes execution particular task or the routine for realizing particular abstract data type, program, object, component, data knot
Structure etc..The present invention can also be put into practice in a distributed computing environment, in these DCEs, by passing through communication network
Network and connected remote processing devices perform task.In a distributed computing environment, program module, which can be located at, includes depositing
In local and remote computer-readable storage medium including storage equipment.
Although disclosing embodiments of the invention and accompanying drawing for the purpose of illustration, those skilled in the art can manage
Solution：Do not departing from the present invention and spirit and scope of the appended claims in, it is various replace, change and modifications all be it is possible,
Therefore, the scope of the present invention is not limited to embodiment and accompanying drawing disclosure of that.
Claims (7)
1. it is a kind of using the method for checking electronic transducer for improving digital filtering algorithm, it is characterised in that：Comprise the following steps：
(1) synchronous acquisition electronic mutual inductor to be measured and analog quantity turn the sampled data of digital quantity system；
(2) digital filtering processing is carried out to the sampled data using improvement digital filtering algorithm, and exported at the digital filtering
Manage data；
(3) the fundamental component of the sampled data is extracted respectively using zero crossing detection；
(4) frequency, the phase and amplitude of the sampled data are obtained respectively according to phase difference method；
According to the frequency, the phase and the amplitude calculate the phase error of electronic mutual inductor to be measured, current error,
Voltage error and A class uncertainties.
2. according to claim 1 using the method for checking electronic transducer for improving digital filtering algorithm, its feature exists
In：The step (2) middle improvement digital filtering algorithm, step is：
1. a queue for accommodating N number of data is set up；
2. the sampled data is inputted into the queue, and judges whether the queue is full；
If 3. the queue less than, the sampled data is exported, and repeat judge the queue whether full step；
If 4. the queue is full, the maximum and minimum value in the queue are removed, and ask for remaining (N-2) individual data
Arithmetic mean of instantaneous value, the arithmetic mean of instantaneous value is exported, and repeat judge the queue whether full step.
3. according to claim 2 using the method for checking electronic transducer for improving digital filtering algorithm, its feature exists
In：If (2) the step is improved in digital filtering algorithm, 4. the queue is full, and step includes：
A sorts to the sampled data according to bubble sort method；
B stores maximum and minimum value in the queue.
4. according to claim 3 using the method for checking electronic transducer for improving digital filtering algorithm, its feature exists
In：The specific method of the step a is：For an array for having N number of data, since the first number from the beginning to the end two-by-two
Compare, when previous number is bigger than latter number, then exchange their position, until a maximum number has been come array
Tail afterwards；Then last number is fixed, it is no longer necessary to compared, it is only necessary to repeat to compare N-1 numbers above according to the method described above,
Until discharge order.
5. it is a kind of using the electronic type transformer checking system for improving digital filtering algorithm, it is characterised in that：Including：
Sampled data acquisition module, the sampled data acquisition module is used for synchronous acquisition electronic mutual inductor to be measured and analog quantity
Turn the sampled data of digital quantity system；
Digital filtering processing module, the digital filtering processing module is used for using improvement digital filtering algorithm to the hits
According to progress digital filtering processing；
Fundamental component extraction module, the fundamental component extraction module is used to extract the sampling respectively using zero crossing detection
The fundamental component of data；
Frequency, phase and amplitude acquisition module, the frequency, phase and amplitude acquisition module are used to be obtained respectively according to phase difference method
Take frequency, the phase and amplitude of the sampled data；
Phase error, current error, voltage error and A class uncertainty calculation modules, the phase error, current error, electricity
Hold up difference and class uncertainty calculation module mutual for calculating electronic type to be measured according to the frequency, the phase and the amplitude
Phase error, current error, voltage error and the A class uncertainties of sensor.
6. according to claim 5 using the electronic type transformer checking system for improving digital filtering algorithm, its feature exists
In：The digital filtering processing module includes the queue setting up submodule, queue input submodule, hits being linked in sequence successively
According to output sub-module and arithmetic mean of instantaneous value output sub-module：
Queue setting up submodule, the queue setting up submodule is used to set up a queue for accommodating N number of data；
Queue input submodule, the queue input submodule is used to the sampled data inputting the queue, and judges institute
Whether full state queue；
Sampled data output sub-module, the sampled data output sub-module be used for when the queue less than when, by the sampling
Data output, and repeat judge the queue whether full step；
Arithmetic mean of instantaneous value output sub-module, the arithmetic mean of instantaneous value output sub-module is used to, when the queue is expired, remove institute
The maximum and minimum value in queue are stated, and asks for the arithmetic mean of instantaneous value of remaining N-2 data, the arithmetic mean of instantaneous value is defeated
Go out, and repeat judge the queue whether full step.
7. according to claim 5 using the electronic type transformer checking system for improving digital filtering algorithm, its feature exists
In：The digital filtering processing module includes sampled data sorting sub-module and the sub-module stored being connected with each other,
The sampled data order module is used to sort to the sampled data according to bubble sort method；
The sub-module stored is used to store maximum and minimum value in the queue.
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| CN109781195A (en) * | 2019-01-21 | 2019-05-21 | 西南石油大学 | A kind of Electromagnetic Flow meter systems and method for extracting signal based on dual-frequency excitation |
| CN110481270A (en) * | 2019-08-27 | 2019-11-22 | 江苏阿尔特空调实业有限责任公司 | Air conditioner for electric motor coach throttling control method, device and air-conditioning system |
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