CN107831364A - A kind of electric energy harmonic detecting method - Google Patents
A kind of electric energy harmonic detecting method Download PDFInfo
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- CN107831364A CN107831364A CN201711129973.5A CN201711129973A CN107831364A CN 107831364 A CN107831364 A CN 107831364A CN 201711129973 A CN201711129973 A CN 201711129973A CN 107831364 A CN107831364 A CN 107831364A
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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
- G01R23/16—Spectrum analysis; Fourier analysis
- G01R23/165—Spectrum analysis; Fourier analysis using filters
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/16—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using capacitive devices
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- General Physics & Mathematics (AREA)
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- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Abstract
The invention discloses a kind of electric energy harmonic detecting method, comprise the following steps：A, the harmonic signal of High voltage output circuit is gathered by harmonic signal harvester and carries out rectifying and wave-filtering processing；B, FFT calculation process is carried out to the signal after rectifying and wave-filtering processing；C, corresponding frequency spectrum is obtained after FFT calculation process, the frequency content in cycle alternating-current amount is determined according to frequency spectrum；D, afterwards by comprising frequency content, it is determined that needing the high band that decomposes, obtain each harmonic component of no spectrum leakage, realize the detection to harmonic wave.The harmonic detecting method that the present invention uses is simple to operate, and resource utilization ratio is few, improves detection efficiency.
Description
Technical field
The present invention relates to electric energy harmonic detecting technique field, specially a kind of electric energy harmonic detecting method.
Background technology
With the continuous progress and rapid development of economy of society, the production and living level of the mankind has obtained greatly carrying
Height, nonlinear load and the punching such as the motor of various models, fairing, electric arc furnaces and alternating current-direct current convertor equipment in power system
The load of hitting property is continuously increased.These nonlinear loads randomly combined runnings in power network, cause electric current, voltage waveform
Severe distortion.In electric current, voltage waveform in distortion, frequency and power supply identical sinusoidal quantity, referred to as base are not only existed
Wave component, have also appeared a series of sinusoidal components for the integral multiple that frequency is fundametal compoment frequency, and a series of this component is exactly electricity
Power harmonic wave.
Harmonic wave makes production, transmission and the efficiency reduction used of electric energy and produces harm to the electromagnetic environment of surrounding.Sending out
In electric process, electric rotating machine is set to produce additional power losses and heating, produce pulsating torque and noise；During transmission,
Power system series parallel resonance can be caused, harmonic content is further amplified, cause capacitor equipment to burn, Er Qiexie
Ripple electric current causes to be lost in transformer and additional heating, reduces the load capacity of transformer；During use, make electricity
Gas apparatus overheat, vibration and noise are produced, and make insulation ag(e)ing, broken down or burn, service life shortens, to relay protection
Or automaton produces interference, causes malfunction or tripping, instrument and electric energy metrical are also disturbed, causes larger error.
Therefore, problem for power system harmonics is in depth studied, harmonic carcellation pollution, harmonic content is controlled in allowed band
Interior, to the safety and economic operation of electric power system, the protection of power system and the safe operation of electrical equipment are of great importance.
The content of the invention
It is an object of the invention to provide a kind of electric energy harmonic detecting method, is asked with solve to propose in above-mentioned background technology
Topic.
To achieve the above object, the present invention provides following technical scheme：A kind of electric energy harmonic detecting method, including following step
Suddenly：
A, the harmonic signal of High voltage output circuit is gathered by harmonic signal harvester and carried out by rectification filtering module whole
Flow filtering process；
B, FFT calculation process is carried out by fft processing unit to the signal after rectifying and wave-filtering processing；
C, corresponding frequency spectrum is obtained after FFT calculation process, the frequency content in cycle alternating-current amount is determined according to frequency spectrum；
D, afterwards by comprising frequency content, it is determined that needing the high band that decomposes, obtain each harmonic component of no spectrum leakage,
Realize the detection to harmonic wave.
Preferably, in the step A harmonic signal harvester include capacitor induction type sensor, signal condition unit,
Microprocessor, wireless transmitting unit；The capacitor induction type sensor contacts with ultra-high-tension power transmission line obtains voltage harmonic signal,
The output end of the capacitor induction type sensor and the input of signal condition unit connect；The output of the signal condition unit
End is connected with microprocessor；The input of the wireless transmitting unit is connected with microprocessor, the wireless transmitting unit it is defeated
Go out end to be connected with the input of capacitor induction type sensor.
Preferably, rectification filtering module includes three group transistor groups and the electrochemical capacitor being connected in parallel in the step A, point
For the first transistor group, second transistor group and third transistor group, the first transistor group includes the field effect being connected in series
Answer transistor A and field-effect transistor B；The second transistor group includes field-effect transistor C and the field-effect being connected in series
Transistor D；The third transistor group includes the field-effect transistor E and field-effect transistor F being connected in series；Described first is brilliant
Electric capacity A is connected in parallel between body pipe group and second transistor group；It is in parallel between the second transistor group and third transistor group
Connect electric capacity B；The three group transistors group accesses three phase mains by fuse, inductance respectively.
Preferably, fft processing unit includes control unit, read-only storage, random access memory, multichannel in the step B
Selector, input pretreatment unit, butterfly processing element, output processing unit and inverted order output unit, described control unit point
It is not connected with read-only storage, random access memory, input pretreatment unit, output processing unit and inverted order output unit；It is described
Read-only storage connects butterfly processing element, and the random access memory connects MUX.
Compared with prior art, the beneficial effects of the invention are as follows.
（1）The harmonic detecting method that the present invention uses is simple to operate, and resource utilization ratio is few, improves detection efficiency.
（2）The harmonic signal harvester that the present invention uses can be directly obtained using capacitance type sensor cordless
Ultra-high-tension power transmission line harmonic signal, acquisition precision is high, further increases detection efficiency.
（3）The rectification filtering module that the present invention uses can enter row buffering to the electric flux of collection, and it is humorous to suppress DC side
Wave voltage, improve detection efficiency.
（4）The fft processing unit that the present invention uses utilizes the symmetry principle of twiddle factor, can greatly reduce discrete Fu
The operand of vertical leaf transformation, while reduce resource utilization.
Brief description of the drawings
Fig. 1 is overhaul flow chart of the present invention.
Fig. 2 is harmonic signal harvester schematic diagram of the present invention.
Fig. 3 is the rectification filtering module schematic diagram of the present invention.
Fig. 4 is fft processing unit theory diagram of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, rather than whole embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other under the premise of creative work is not made
Embodiment, belong to the scope of protection of the invention.
Fig. 1-4 are referred to, the present invention provides a kind of technical scheme：A kind of electric energy harmonic detecting method, comprises the following steps：
A, the harmonic signal of High voltage output circuit is gathered by harmonic signal harvester and carried out by rectification filtering module whole
Flow filtering process；
B, FFT calculation process is carried out by fft processing unit to the signal after rectifying and wave-filtering processing；
C, corresponding frequency spectrum is obtained after FFT calculation process, the frequency content in cycle alternating-current amount is determined according to frequency spectrum；
D, afterwards by comprising frequency content, it is determined that needing the high band that decomposes, obtain each harmonic component of no spectrum leakage,
Realize the detection to harmonic wave.
In the present invention, in step A harmonic signal harvester include capacitor induction type sensor 1, signal condition unit 2,
Microprocessor 3, wireless transmitting unit 4；The capacitor induction type sensor 1 contacts with ultra-high-tension power transmission line obtains voltage harmonic letter
Number, the output end of the capacitor induction type sensor 1 is connected with the input of signal condition unit 2；The signal condition unit 2
Output end be connected with microprocessor 3；The input of the wireless transmitting unit 4 is connected with microprocessor 3, the wireless transmission
The output end of unit 4 is connected with the input of capacitor induction type sensor 1.The harmonic signal harvester that the present invention uses utilizes
Capacitance type sensor cordless can directly obtain ultra-high-tension power transmission line harmonic signal, and acquisition precision is high, further improve
Detection efficiency.
In the present invention, rectification filtering module includes three group transistor groups and the electrochemical capacitor 5 being connected in parallel in step A, point
For the first transistor group, second transistor group and third transistor group, the first transistor group includes the field effect being connected in series
Answer transistor A1a and field-effect transistor B2a；The second transistor group include the field-effect transistor C3a that is connected in series and
Field-effect transistor D4a；The third transistor group includes the field-effect transistor E5a and field-effect transistor being connected in series
F6a；Electric capacity A1b is connected in parallel between the first transistor group and second transistor group；The second transistor group and the 3rd
Electric capacity B2b is connected in parallel between transistor group；The three group transistors group accesses three-phase electricity by fuse 6, inductance 7 respectively
Source.The rectification filtering module that the present invention uses can enter row buffering to the electric flux of collection, and suppress DC side harmonics voltage, carry
High detection efficiency.
In the present invention, fft processing unit includes control unit 8, read-only storage 9, random access memory 10, more in step B
Road selector 11, input pretreatment unit 12, butterfly processing element 13, output processing unit 14 and inverted order output unit 15, institute
State control unit 8 respectively with read-only storage 9, random access memory 10, input pretreatment unit 12, output processing unit 14 and fall
Sequence output unit 15 connects；The read-only storage 9 connects butterfly processing element 13, and the random access memory connects 10 and connects multichannel choosing
Select device 11.Input control signal and MUX unit caused by the input reception control unit of pretreatment unit and only
The data of memory output are read, its output end connection butterfly processing element, pretreated data are sent into butterfly processing element
In, the input of butterfly processing element receives the related data of input pretreatment unit output, and it includes read-only storage list
Time domain data in the angle value and random-access memory unit of twiddle factor in member required for caused butterfly processing element or
Computing intermediate data, the output end of butterfly processing element is connected with exporting the input of processing unit, and the data after computing are defeated
Enter to be sent into output processing unit, the fft processing unit that the present invention uses utilizes the symmetry principle of twiddle factor, can subtracted significantly
The operand of small DFT, while reduce resource utilization.
In summary, the harmonic detecting method that the present invention uses is simple to operate, and resource utilization ratio is few, improves detection
Efficiency.
Although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, can be with
A variety of changes, modification can be carried out to these embodiments, replace without departing from the principles and spirit of the present invention by understanding
And modification, the scope of the present invention is defined by the appended.
Claims (4)
- A kind of 1. electric energy harmonic detecting method, it is characterised in that：Comprise the following steps：A, the harmonic signal of High voltage output circuit is gathered by harmonic signal harvester and carried out by rectification filtering module whole Flow filtering process；B, FFT calculation process is carried out by fft processing unit to the signal after rectifying and wave-filtering processing；C, corresponding frequency spectrum is obtained after FFT calculation process, the frequency content in cycle alternating-current amount is determined according to frequency spectrum；D, afterwards by comprising frequency content, it is determined that needing the high band that decomposes, obtain each harmonic component of no spectrum leakage, Realize the detection to harmonic wave.
- A kind of 2. electric energy harmonic detecting method according to claim 1, it is characterised in that：Harmonic signal in the step A Harvester includes capacitor induction type sensor（1）, signal condition unit（2）, microprocessor（3）, wireless transmitting unit（4）； The capacitor induction type sensor（1）Contacted with ultra-high-tension power transmission line and obtain voltage harmonic signal, the capacitor induction type sensing Device（1）Output end and signal condition unit（2）Input connection；The signal condition unit（2）Output end and Wei Chu Manage device（3）Connection；The wireless transmitting unit（4）Input and microprocessor（3）Connection, the wireless transmitting unit（4） Output end and capacitor induction type sensor（1）Input connection.
- A kind of 3. electric energy harmonic detecting method according to claim 1, it is characterised in that：Rectifying and wave-filtering in the step A Module includes three group transistor groups and the electrochemical capacitor being connected in parallel（5）, it is divided into the first transistor group, second transistor group and Three transistor groups, the first transistor group include the field-effect transistor A (1a) and field-effect transistor B being connected in series (2a)；The second transistor group includes the field-effect transistor C (3a) and field-effect transistor D (4a) being connected in series；It is described Third transistor group includes the field-effect transistor E (5a) and field-effect transistor F (6a) being connected in series；The first transistor Electric capacity A (1b) is connected in parallel between group and second transistor group；It is in parallel between the second transistor group and third transistor group Connect electric capacity B (2b)；The three group transistors group passes through fuse respectively（6）, inductance（7）Access three phase mains.
- A kind of 4. electric energy harmonic detecting method according to claim 1, it is characterised in that：FFT processing is single in the step B Member includes control unit（8）, read-only storage（9）, random access memory（10）, MUX（11）, input pretreatment unit （12）, butterfly processing element（13）, output processing unit（14）With inverted order output unit（15）, described control unit（8）Respectively With read-only storage（9）, random access memory（10）, input pretreatment unit（12）, output processing unit（14）Exported with inverted order Unit（15）Connection；The read-only storage（9）Connect butterfly processing element（13）, the random access memory company（10）Connect multichannel Selector（11）.
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| CN201711129973.5A CN107831364A (en) | 2017-11-15 | 2017-11-15 | A kind of electric energy harmonic detecting method |
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