CN109490628A - A kind of Measurement of Harmonics in Power System system - Google Patents
A kind of Measurement of Harmonics in Power System system Download PDFInfo
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- CN109490628A CN109490628A CN201811628887.3A CN201811628887A CN109490628A CN 109490628 A CN109490628 A CN 109490628A CN 201811628887 A CN201811628887 A CN 201811628887A CN 109490628 A CN109490628 A CN 109490628A
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- avr single
- harmonics
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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
Abstract
The present invention relates to a kind of Measurement of Harmonics in Power System system, including current transformer, signal processor, level translator, AVR single chip, regulated power supply, computers；Current transformer generates the electric current after reducing and is transferred to the signal processor；Signal processor converts the current into voltage, it amplifies, filters, then low-frequency voltage signal is transmitted in level translator again, target voltage signal is converted by low-frequency voltage signal again, and it is transmitted in the AVR single chip, then to target voltage signal and carry out analog-to-digital conversion, and be converted into digital standard voltage, obtain the amplitude of each harmonic, it retransmits to computer and carries out display observation, regulated power supply and AVR single chip communicate to connect, for stablizing the conversion ratio of analog-digital converter.It solves the problems, such as that Measurement of Harmonics in Power System process is cumbersome by above system, realizes the effect for reducing system cost, reduce the calculation amount to harmonic amplitude analysis, moreover it is possible to user be made to detect the parameter and amplitude of harmonic wave in real time.
Description
Technical field
The present invention relates to Power System Analysis technical fields, and in particular to a kind of Measurement of Harmonics in Power System system.
Background technique
With the development of the social economy, electric energy becomes more and more important in various industries and people's lives, while electric energy
Influence of the quality of to entire electric system itself is also increasing.The ideal waveform of voltage and current in electric system is work
Working frequency is in the sinusoidal waveform of 50H or 60Hz, but as the scale of electric system is increasing, various power electronics are set
Standby, the sharp increase of the nonlinear-loads such as electric railway causes the waveform of network voltage and electric current to deviate from the sinusoidal waveform of standard,
So that the waveform of voltage and current is distorted, that is, harmonic wave is generated, the pollution of Harmonious Waves in Power Systems also becomes increasingly as a result,
Seriously.
As a result, in order to solve the contamination hazard of Harmonious Waves in Power Systems, harmonic wave can be examined using Harmonic Detecting Algorithm
It surveys, and this is only limitted to the detection for integer harmonic.But it includes a large amount of for not only having integer harmonic also in electric system at present
Between subharmonic, therefore be widely used at present Fourier transformation detection method analysis and processing electric system harmonic wave, but at present
The device process of majority detection Harmonious Waves in Power Systems is more complex cumbersome, low efficiency.
Summary of the invention
In view of this, it is an object of the invention to overcome the deficiencies of the prior art and provide a kind of Measurement of Harmonics in Power System
System.It is cumbersome to solve current Measurement of Harmonics in Power System systematic procedure, can not detect for user in real time and check electric system
The problem of parameter and amplitude of harmonic wave.
In order to achieve the above object, the present invention adopts the following technical scheme:
A kind of Measurement of Harmonics in Power System system, comprising: current transformer, signal processor, level translator, AVR are mono-
Piece machine, regulated power supply, computer；
The current transformer is connected, for reducing in work of electric power system by conducting wire with the signal processor
Electric current simultaneously reduces the electric current, and the electric current after reduction is transferred to the signal processor；
The signal processor is connected with the level translator by conducting wire, for will be after the reduction that received
Electric current be converted into voltage, and again by the voltage amplification, generate amplified voltage, and by the amplified voltage into
Row filtering, obtains low-frequency voltage signal, the low-frequency voltage signal is transmitted to the level translator；
The level translator is connected with the AVR single chip by conducting wire, for converting the low-frequency voltage restricting the number
For target voltage signal, and the target voltage signal is transmitted to the AVR single chip；
The AVR single chip is communicated to connect with the computer, for receiving the target voltage signal and by the mesh
Mark voltage signal is converted into digital standard voltage, calculates each harmonic of the digital standard voltage, obtains the digital standard
The amplitude of each harmonic of voltage, amplitude to the computer for retransmiting each harmonic are shown, are observed for user；
The regulated power supply and the AVR single chip communicate to connect, and are converted into institute for stablizing the target voltage signal
State conversion ratio when digital standard voltage.
Optionally, the signal processor includes: current-to-voltage convertor, voltage amplifier, low-pass filter；
The current-to-voltage convertor is connected, for receiving respectively with the current transformer, the voltage amplifier
Electric current after stating the reduction of current transformer transmission, and convert voltage for the electric current after the reduction, then by the electricity
Pressure is delivered to the voltage amplifier；
The voltage amplifier is also connected with the low-pass filter, for receiving the amplified voltage, and by institute
It states amplified voltage to be filtered, obtains low-frequency voltage signal, and the low-frequency voltage signal is transmitted to the electricity
Flat turn parallel operation.
Optionally, the low-frequency voltage signal is ac voltage signal.
Optionally, the frequency of the low-frequency voltage signal is 30KHz to the frequency between 300KHz.
Optionally, the signal processor is also used to convert the ac voltage signal to the DC voltage letter of response
Number.
Optionally, the AVR single chip includes: AVR single chip minimum system；The AVR single chip minimum system difference
It is connected with the level translator, the computer, the digital standard electricity sent for receiving the level translator
The amplitude for pressing and being calculated each harmonic of the digital standard voltage retransmits the amplitude of each harmonic to the meter
Calculation machine is shown.
Optionally, the AVR single chip minimum system further includes AVR single chip ontology, AVR single chip interface, clock vibration
Swing module, crystal oscillator interface；
The AVR single chip interface is set on the AVR single chip ontology, and the level translator is described in
AVR single chip interface is connected with the AVR single chip ontology；
The clock oscillation module is connected by the crystal oscillator interface with the AVR single chip ontology, for being the AVR
Single-chip microcontroller provides clock signal when working.
Optionally, 5 volts and/or 5 volts minus as evidence of the output voltage of voltage regulation of the regulated power supply device.
Optionally, the amplitude of each harmonic is at most the amplitude of the seventh harmonic.
Optionally, the low-pass filter is used to filter out the voltage that voltage is higher than 400 hertz frequencies.
Technical solution provided by the present application can include the following benefits:
Measurement of Harmonics in Power System system includes: current transformer, signal processor, level translator, AVR single chip,
Regulated power supply, computer；It is connected by current transformer with signal processor, reduce the electric current in work of electric power system and will be subtracted
Electric current after small is transferred to signal processor, and signal processor is connected with level translator, receives the electric current after reducing and conversion
For voltage, then by voltage amplification, amplified voltage is generated, and amplified voltage is filtered, obtains low-frequency voltage letter
Number, and it is transmitted to comment converter, and level translator is connected with AVR single chip, by the size of the voltage of low-frequency voltage signal
It is converted into target voltage signal, and is transferred in AVR single chip, AVR single chip is connected with computer again, is receiving target electricity
Analog-to-digital conversion is carried out after pressure signal, converts digital standard voltage for target voltage signal, then calculate each of digital standard voltage
Subharmonic, amplitude to the computer for obtaining retransmiting after each harmonic amplitude of digital standard voltage each harmonic carry out display confession
User's observation, also, regulated power supply is connected with AVR single chip, when stable objects voltage signal is converted into digital standard voltage
Conversion ratio.AVR single chip used in system by above-mentioned Measurement of Harmonics in Power System can carry out Harmonious Waves in Power Systems
It reduces when detection and analysis to the calculation amount of harmonic amplitude, and since AVR single chip is connected with computer, it is real-time to also achieve user
The parameters of Harmonious Waves in Power Systems and the effect of amplitude are checked in detection.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1 is a kind of structure chart for Measurement of Harmonics in Power System system that one embodiment of the application provides.
In figure: 101, current transformer；102, signal processor；103, current-to-voltage convertor；104, voltage amplifier；
105, low-pass filter；106, level translator；107, AVR single chip；108, computer；109, regulated power supply.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, technical solution of the present invention will be carried out below
Detailed description.Obviously, described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Base
Embodiment in the present invention, those of ordinary skill in the art are obtained all without making creative work
Other embodiment belongs to the range that the present invention is protected.
Fig. 1 is a kind of structure chart for Measurement of Harmonics in Power System system that one embodiment of the application provides, and is wrapped as shown in Figure 1
It includes: current transformer 101, signal processor 102, level translator 106, AVR single chip 107, computer 108, regulated power supply
109。
Wherein, signal processor 102 specifically includes: current-to-voltage convertor 103, voltage amplifier 104, low-pass filter
105；
Current transformer 101 is connected with current-to-voltage convertor 103 by conducting wire, for reducing Harmonic in Power System inspection
The electric current in work is surveyed, and the electric current after reduction is transferred to current-to-voltage convertor 103, electric current electricity by current transformer 101
Pressure converter 103 is connected with voltage amplifier 104, for receiving the electric current after the current transformer 101 conveys the reduction come,
And voltage is converted by the electric current after reduction, then voltage is delivered to voltage amplifier 104；And voltage amplifier 104 and low pass
Filter 105 is connected, and for amplifying voltage, and generates amplified voltage, and amplified voltage is delivered to low
Bandpass filter 105；Low-pass filter 105 is connected with level translator 106, for receiving amplified voltage, and will be after amplification
Voltage be filtered, obtain low-frequency voltage signal, and low-frequency voltage signal is transmitted to level translator 106.This reality
The low-frequency voltage signal applied in example is ac voltage signal, and the frequency of the low-frequency voltage signal in this electric system is
30KHz is to the frequency between 300KHz.In the present embodiment, the electric current after reduction is converted, obtains voltage, and to voltage into
Row amplification, is filtered that three is indispensable to amplified voltage, and the process that triplicity is got up is in electric system
The pretreatment of current and voltage signals, i.e. current-to-voltage convertor 103, voltage amplifier 104,105 three of low-pass filter is together
Constitute the signal processor 102 in electric system.And signal processor 102 is also used to convert ac voltage signal to accordingly
D. c. voltage signal.In the present embodiment, the working frequency of electric system is 50Hz, and in measurement power train in the present embodiment
When the amplitude of system each harmonic, highest only measures the amplitude of the seventh harmonic.And the low-pass filtering used in the present embodiment
Device 105 can filter the voltage higher than 400 hertz, leave the voltage lower than 400 hertz.
In the present embodiment, level translator 106 is connected with AVR single chip 107 by conducting wire, is used for low-frequency voltage signal
It is converted into target voltage signal, and target voltage signal is transmitted in AVR single chip 107.Level conversion in the present embodiment
Device 106 realizes the communication of AVR single chip 107 and computer 108 with this level translator using RS-232 level translator
, and RS-232 level translator is using MAX232 integrated circuit.
In the present embodiment, AVR single chip 107 and computer 108 are communicated to connect, for receiving target voltage signal and carrying out
Analog-to-digital conversion converts digital standard voltage for target voltage signal, and calculates each harmonic of mathematical standard voltage, is counted
The amplitude of each harmonic of word normal voltage, amplitude to the computer 108 for retransmiting each harmonic are shown, are seen for user
It examines.Also, AVR single chip 107 includes AVR single chip minimum system；AVR single chip minimum system respectively with level translator
106, computer 108 is connected, for receiving digital standard voltage that level translator 106 is sent and digital standard being calculated
The amplitude of each harmonic of voltage, amplitude to the computer 108 for retransmiting each harmonic are shown.And it is described
AVR single chip minimum system further includes AVR single chip ontology, AVR single chip interface, clock oscillation module, crystal oscillator interface；AVR
Interface microcontroller is set on AVR single chip ontology, and level translator 106 by the AVR single chip interface with it is described
AVR single chip ontology is connected；Clock oscillation module is connected by crystal oscillator interface with AVR single chip ontology, for being AVR single chip
Clock signal is provided when 107 work.In the present embodiment, when detecting Harmonious Waves in Power Systems, the AVR single chip 107 used is
ATmega32L single-chip microcontroller, ATmega32L single-chip microcontroller are the serial 8 byte single-chip microcontrollers of MEGA of new generation of atmel corp, and such
The single-chip microcontroller kernel of type is lower compared with other brand similar-type products using power consumption, has both the RISC essence of a variety of Energy Saving Control modes
Simple instruction system, and its ISP programmable system being internally integrated reduces parallel so that the exploitation of single-chip microcontroller is more convenient
The cost of programmable device.Meanwhile the Measurement of Harmonics in Power System system in the present embodiment further includes clock oscillation module, crystal oscillator connects
Mouthful, and clock oscillation module is connected by being detectd excuse with AVR single chip 107.Since clock oscillation module is connect by crystal oscillator
Mouth is connected with AVR single chip ontology, due to being built in the clock oscillation module inside single-chip microcontroller by supply voltage and environment temperature
The influence of degree is very big, and requires have a more accurate oscillation frequency clock in the present invention, thus unavailable single-chip microcontroller itself when
Clock route is changed to external the circuitry of crystal oscillator, i.e. clock oscillation module in the present invention passes through crystal oscillator interface and AVR single chip ontology
It is connected.In addition, it includes: numerous structures such as serial line interface, WatchDog Timer that AVR single chip 107, which is also integrated with, make it possible to
Meet the job requirement under more type multiple-situation.Also, the AVR single chip 107 in the present embodiment has carried out excellent also directed to high-level language
Change, so that the execution efficiency of its code is higher.When AVR single chip 107 is in running order, stop working in its memory
Meanwhile reseting interface, crystal oscillator interface, digital power interface, analog-digital converter and interruption system still are able to work on.AVR
8 RISC reduced instruction set single-chip microcontrollers are gone back while be integrated on single-chip microcontroller 107, can be provided for AVR single chip 107 powerful
Performance and function are supported, therefore, use AVR single chip 107 that can realize the detection to Harmonious Waves in Power Systems with lower cost.
In the present embodiment, since the SRAM memory and 32KB that have been integrated with 2KB size inside AVR single chip 107 are big
Therefore the read-only programmable device of FlashROM does not need external computer storage and can be realized acquisition and the harmonic wave of signal
Analysis function.And the minimum circuit schematic diagram of the AVR single chip 107 in the present embodiment only includes single-chip microcontroller itself, powers on
Reseting module, clock shake module, analog-to-digital conversion module.
In the present embodiment, AVR single chip ontology further include: electrification reset module, reseting interface, analog-to-digital conversion are touched, number
Word power interface, and electrification reset module is connected by reseting interface with AVR single chip ontology, is connect for reducing the reset
The voltage of mouth.Electrification reset module is integrated in the inside of AVR single chip 107, and this simplifies the external resets of AVR single chip 107
Route design, and the resistance of a 10k Ω has been pulled to power supply VCC, and also for the line security of entire electric system
Capacitor provided with a 0.1uF is made a return journey the wave interference that cleans.In the present embodiment, analog-to-digital conversion module is connect by the digital power
Mouth is connected with AVR single chip ontology, for converting digital standard voltage for standard voltage signal.In circuit practical work process
In, the electromagnetic interference generated in digital circuit inside and outside system largely can hardness analogue measurement precision of the invention, because
This, the present invention reduces noise in terms of following three: (1) analog signal line with the digital signal line that switches at high speed separated,
And guarantee that analog channel is as short as possible.(2) power supply needs to connect by conduction capacity network with digital voltage source.(3) modulus turns
Mold changing block need to reduce the interference noise of CPU processor sending using ADC noise suppressor.Inside AVR single chip 107
The precision of analog-to-digital conversion device only has 10, whole to guarantee although the reference voltage carried inside AVR single chip 107 is with abundance
Ground capacity of the security needs of a electric system in one 10uF of AREF reference voltage external input pin serial connection.
In the present embodiment, regulated power supply 109 and AVR single chip 107 are communicated to connect, and are converted for stable objects voltage signal
When digital standard voltage when conversion ratio, and the output voltage of voltage regulation of regulated power supply 109 is positive 5 volts and/or 5 volts minus.Due to AVR
The range of the operating voltage of single-chip microcontroller 107 is 2.7V to 5.5V, but is turned in real work in order to eliminate unstable power supply to modulus
Influenced caused by the transformation result of parallel operation, then work of electric power system usually will increase an output voltage be positive 5 volts and/or
Minus 5 volts of regulated power supply is as working power.Since the operating current of each element of 107 system of AVR single chip is only milliampere
The operating current of grade, and the power consumption in electric system is extremely low, therefore selects to take out among secondary in the selection of power transformer
Head and output power are 5W transformer.
AVR single chip used in the system of Measurement of Harmonics in Power System through this embodiment, realize can into
The calculation amount to harmonic amplitude is reduced when row Measurement of Harmonics in Power System is analyzed, and also achieves the effect of the cost of reduction system
Fruit, reduces the cost of Measurement of Harmonics in Power System, and since AVR single chip is connected with computer, also achieving keeps user real-time
Detection check the parameters of Harmonious Waves in Power Systems and the effect of amplitude.
It is understood that same or similar part can mutually refer in the various embodiments described above, in some embodiments
Unspecified content may refer to the same or similar content in other embodiments.
It should be noted that in the description of the present invention, term " first ", " second " etc. are used for description purposes only, without
It can be interpreted as indication or suggestion relative importance.In addition, in the description of the present invention, unless otherwise indicated, the meaning of " multiple "
Refer at least two.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example
Point is included at least one embodiment or example of the invention.In the present specification, schematic expression of the above terms are not
Centainly refer to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be any
One or more embodiment or examples in can be combined in any suitable manner.
Although the embodiments of the present invention has been shown and described above, it is to be understood that above-described embodiment is example
Property, it is not considered as limiting the invention, those skilled in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, modifies, replacement and variant.
Claims (10)
1. a kind of Measurement of Harmonics in Power System system characterized by comprising current transformer, signal processor, level conversion
Device, AVR single chip, regulated power supply, computer；
The current transformer is connected, for receiving the electric current in work of electric power system by conducting wire with the signal processor
And reduce the electric current, the electric current after reduction is transferred to the signal processor；
The signal processor is connected with the level translator by conducting wire, for by the electricity after the reduction received
Circulation turns to voltage, and the voltage amplification is generated amplified voltage again, and the amplified voltage is filtered
Wave obtains low-frequency voltage signal, and the low-frequency voltage signal is transmitted to the level translator；
The level translator is connected, for converting mesh for the low-frequency voltage signal by conducting wire with the AVR single chip
Voltage signal is marked, and the target voltage signal is transmitted to the AVR single chip；
The AVR single chip is communicated to connect with the computer, for receiving the target voltage signal and by target electricity
Pressure signal is converted into digital standard voltage, calculates each harmonic of the digital standard voltage, obtains the digital standard voltage
Each harmonic amplitude, amplitude to the computer for retransmiting each harmonic shown, is observed for user；
The regulated power supply communicates to connect with the AVR single chip, is converted into the number for stablizing the target voltage signal
Conversion ratio when word normal voltage.
2. a kind of Measurement of Harmonics in Power System system according to claim 1, which is characterized in that the signal processor packet
It includes: current-to-voltage convertor, voltage amplifier, low-pass filter；
The current-to-voltage convertor is connected with the current transformer, the voltage amplifier respectively, for receiving the electricity
Electric current after the reduction that current transformer is sent, and voltage is converted by the electric current after the reduction, then the voltage is defeated
It send to the voltage amplifier；
The voltage amplifier is also connected with the low-pass filter, for amplifying the voltage, generates amplified
Voltage, and the amplified voltage is delivered to the low-pass filter；
The low-pass filter is connected with the level translator, for receiving the amplified voltage, and by the amplification
Voltage afterwards is filtered, and obtains low-frequency voltage signal, and the low-frequency voltage signal is transmitted to the level conversion
Device.
3. a kind of Measurement of Harmonics in Power System system according to claim 1, which is characterized in that the low-frequency voltage
Signal is ac voltage signal.
4. a kind of Measurement of Harmonics in Power System system according to claim 1, which is characterized in that the low-frequency voltage signal
Frequency be 30KHz to the frequency between 300KHz.
5. a kind of Measurement of Harmonics in Power System system according to claim 1, which is characterized in that the signal processor is also
For converting corresponding d. c. voltage signal for the ac voltage signal.
6. a kind of Measurement of Harmonics in Power System system according to claim 1, which is characterized in that the AVR single chip packet
It includes: AVR single chip minimum system；The AVR single chip minimum system respectively with the level translator, the computer phase
Even, for receiving the digital standard voltage that the level translator is sent and the digital standard voltage being calculated
The amplitude of each harmonic, amplitude to the computer for retransmiting each harmonic are shown.
7. a kind of Measurement of Harmonics in Power System system according to claim 6, which is characterized in that the AVR single chip is most
Mini system further includes AVR single chip ontology, AVR single chip interface, clock oscillation module, crystal oscillator interface；
The AVR single chip interface is set on the AVR single chip ontology, and the level translator passes through the AVR
Interface microcontroller is connected with the AVR single chip ontology；
The clock oscillation module is connected by the crystal oscillator interface with the AVR single chip ontology, for being the AVR monolithic
Machine provides clock signal when working.
8. a kind of Measurement of Harmonics in Power System system according to claim 1, which is characterized in that the regulated power supply it is defeated
Voltage of voltage regulation is positive 5 volts and/or 5 volts minus out.
9. a kind of Measurement of Harmonics in Power System system according to claim 1, which is characterized in that the width of each harmonic
Value is at most the amplitude of the seventh harmonic.
10. a kind of Measurement of Harmonics in Power System system according to claim 2, which is characterized in that the low-pass filter
The voltage for being higher than 400 hertz for filtering out voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811628887.3A CN109490628A (en) | 2018-12-28 | 2018-12-28 | A kind of Measurement of Harmonics in Power System system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811628887.3A CN109490628A (en) | 2018-12-28 | 2018-12-28 | A kind of Measurement of Harmonics in Power System system |
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| CN109490628A true CN109490628A (en) | 2019-03-19 |
Family
ID=65713070
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| CN201811628887.3A Withdrawn CN109490628A (en) | 2018-12-28 | 2018-12-28 | A kind of Measurement of Harmonics in Power System system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113161989A (en) * | 2021-04-27 | 2021-07-23 | 长城电源技术有限公司 | Digital power supply, fault detection circuit and method thereof, and computer readable storage medium |
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| JP2009264753A (en) * | 2008-04-22 | 2009-11-12 | Yokogawa Electric Corp | Harmonics measuring apparatus |
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| CN113161989A (en) * | 2021-04-27 | 2021-07-23 | 长城电源技术有限公司 | Digital power supply, fault detection circuit and method thereof, and computer readable storage medium |
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