CN108594034A - Voltage sag monitoring device and method suitable for frequency converter - Google Patents
Voltage sag monitoring device and method suitable for frequency converter Download PDFInfo
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- CN108594034A CN108594034A CN201810174987.7A CN201810174987A CN108594034A CN 108594034 A CN108594034 A CN 108594034A CN 201810174987 A CN201810174987 A CN 201810174987A CN 108594034 A CN108594034 A CN 108594034A
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- 238000000034 method Methods 0.000 title claims abstract description 12
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- 230000005611 electricity Effects 0.000 claims description 12
- 238000005070 sampling Methods 0.000 claims description 12
- 239000003990 capacitor Substances 0.000 claims description 11
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
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Abstract
The invention provides a voltage sag monitoring device and a method suitable for a frequency converter, wherein the voltage sag monitoring device comprises: the main control board, the alternating voltage detection board, the direct voltage detection board and the inversion voltage detection board are connected with each other through the bus board; the alternating voltage detection board is connected with the input side of the frequency converter through a voltage transformer and is used for detecting the alternating voltage of the input side of the frequency converter; the direct-current voltage detection board is connected with the rectification filtering side of the frequency converter through the direct-current voltage transmitter and is used for detecting the rectification filtering voltage of the frequency converter; the inversion voltage detection board is connected with the output side of the frequency converter through a transformer and used for detecting the inversion output voltage of the frequency converter. The invention can simultaneously monitor the AC voltage at the input side of the frequency converter, the rectified and filtered voltage of the frequency converter and the inverted output voltage of the frequency converter; the pulse modulation waveform of the inverter output voltage of the frequency converter is converted into a sine wave, so that the inverter output voltage of the frequency converter is monitored, and meanwhile, the device also has a frequency tracking function.
Description
Technical field
The present invention relates to technical field of power systems more particularly to a kind of voltage dip monitoring devices suitable for frequency converter
And method.
Background technology
In current industrial society, the characteristics of frequency converter is small with its, precision is high, highly reliable and energy conservation and environmental protection,
It is used widely in industries such as electric power, petrochemical industry, medical treatment, weaving, machineries.However frequency converter belongs to sensitive equipment, supply side hair
Raw voltage dip is easy to bring it about delay machine, and then influences the normal operation of load.Main circuit of frequency converter is by rectification circuit, filtering
Circuit and inverter circuit composition, voltage dip will generate Different Effects for the links of main circuit of frequency converter, to make change
Frequency device output voltage also will produce influence to load, and current monitoring device is to monitor the supply side voltage of frequency converter, still
The rectifying and wave-filtering voltage and inverter output voltage for monitoring frequency converter have important application value, because of the rectification of monitoring frequency converter
Voltage dip just can be further analyzed after filtering voltage and inverter output voltage to each voltage circuit of frequency converter and load
Influence.
Invention content
Technical problem to be solved by the present invention lies in, a kind of voltage dip monitoring device suitable for frequency converter is provided,
To monitor frequency converter input side alternating voltage, frequency converter rectifying and wave-filtering voltage and inversion output voltage and side simultaneously
Method.
In order to solve the above technical problem, the present invention provides a kind of voltage dip monitoring device suitable for frequency converter, packets
It includes：
Master control borad, alternating voltage detection plate, DC voltage detection plate and the inverter voltage detection plate being connected with each other by bus board；
The alternating voltage detection plate connects the input side of frequency converter, the input side for detecting frequency converter by voltage transformer
Alternating voltage；
The DC voltage detection plate connects the rectifying and wave-filtering side of frequency converter by DC voltage transmitter, for detecting frequency converter
Rectifying and wave-filtering voltage；
The inverter voltage detection plate connects the outlet side of frequency converter by transformer, and the inversion for detecting frequency converter exports electricity
Pressure.
Wherein, the voltage dip monitoring device further includes display board, the master control borad, alternating voltage detection plate, direct current
Voltage detecting plate and inverter voltage detection plate are connect by bus board with the display board.
Wherein, the voltage dip monitoring device further includes power panel, the master control borad, alternating voltage detection plate, direct current
Voltage detecting plate and inverter voltage detection plate are connect by bus board with the power panel.
Wherein, the inverter voltage detection plate is equipped with central processing unit, LC filters and zero-crossing comparator, the LC filters
The input terminal of wave device connects the outlet side of the transformer, and the input side of the transformer connects inversion output voltage,
The input terminal of the central processing unit is separately connected the output end of the output end and the zero-crossing comparator of the LC filters, institute
The output end for stating central processing unit connects the master control borad.
Wherein, the inverter output voltage of frequency converter is converted to small signal Sinusoidal Pulse Width Modulation wave after the transformer
Shape, the LC filters are used to the small signal Sinusoidal Pulse Width Modulation waveform that transformer exports being converted to sine wave,
The zero-crossing comparator is used to the sine wave being converted to square wave, and the central processing unit is based on carrying out the square wave
Number, calculates the frequency of the sine wave, resets sample frequency.
Wherein, the LC filters specifically include filter inductance, filter capacitor and sampling resistor, the Zero-cross comparator utensil
Body includes operational amplifier and current-limiting resistance, and one end of the filter inductance connects the first end of the outlet side of the transformer,
The other end connects the filter capacitor, and the other end of the filter capacitor connects the second end of the outlet side of the transformer, institute
It states sampling resistor and is connected in parallel on the both ends of filter capacitor, one end of the sampling resistor connects the fortune by the current-limiting resistance
The reverse input end of amplifier is calculated, the other end of the sampling resistor connects the noninverting input of the operational amplifier, described
The output end of operational amplifier connects the input terminal of the central processing unit in the inverter voltage detection plate.
Wherein, the master control borad is equipped with memory, described to deposit when voltage dip occurs for the input side alternating voltage
Reservoir stores the sampled data of the input side alternating voltage, rectifying and wave-filtering voltage and inverter output voltage.
The present invention also provides a kind of voltage dip monitoring methods suitable for frequency converter, including：
It provides and is examined by master control borad, alternating voltage detection plate, DC voltage detection plate and inverter voltage that bus board is connected with each other
Drafting board；
The input side that the alternating voltage detection plate is connected to frequency converter by voltage transformer, detects the input top-cross of frequency converter
Galvanic electricity pressure；
The rectifying and wave-filtering side that the DC voltage detection plate is connected to frequency converter by DC voltage transmitter, detects frequency converter
Rectifying and wave-filtering voltage；
The outlet side that the inverter voltage detection plate is connected to frequency converter by transformer detects the inversion output electricity of frequency converter
Pressure.
Wherein, the voltage dip monitoring method further includes：
Central processing unit, LC filters and zero-crossing comparator are set in the inverter voltage detection plate, by the LC filters
Input terminal connect the outlet side of the transformer, the input side of the transformer connects inversion output voltage, described
The input terminal of central processing unit is separately connected the output end of the output end and the zero-crossing comparator of the LC filters, in described
The output end of central processor connects the master control borad.
Wherein, the inverter output voltage of the detection frequency converter specifically includes：
The inverter output voltage of frequency converter is converted to small signal Sinusoidal Pulse Width Modulation waveform after the transformer；
The small signal Sinusoidal Pulse Width Modulation waveform that transformer exports is converted into sine wave；
The sine wave is converted into square wave, the square wave is counted, the frequency of the sine wave is calculated, resets and adopt
Sample frequency.
The advantageous effect of the embodiment of the present invention is：Frequency converter input side alternating voltage, frequency converter rectification can be filtered simultaneously
Wave voltage and inversion output voltage are monitored, by circuit design by the pulse tune of inversion output voltage
Waveform processed is converted into sine wave, to realize the monitoring to inversion output voltage, while also having the function of frequency-tracking
And the recording function of recording is carried out to frequency converter input ac voltage, rectifying and wave-filtering voltage and inverter output voltage simultaneously.
Description of the drawings
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 technology 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
Obtain other attached drawings according to these attached drawings.
Fig. 1 is the systematic schematic diagram for the voltage dip monitoring device that the present invention is suitable for frequency converter.
Fig. 2 is the voltage waveform transition diagram of each voltage circuit of frequency converter.
Fig. 3 is detection original of the voltage dip monitoring device to inversion output voltage that the present invention is suitable for frequency converter
Reason figure.
Fig. 4 is detection electricity of the voltage dip monitoring device to inversion output voltage that the present invention is suitable for frequency converter
Lu Tu.
Fig. 5 is waveform turn of the voltage dip monitoring device to inversion output voltage that the present invention is suitable for frequency converter
Change figure.
Specific implementation mode
The explanation of following embodiment is refer to the attached drawing, can be to the specific embodiment implemented to the example present invention.
As shown in Figure 1, the embodiment of the present invention one provides a kind of voltage dip monitoring device suitable for frequency converter, including master
Control plate, alternating voltage detection plate, DC voltage detection plate, inverter voltage detection plate, display board and power panel；Master control borad, friendship
Galvanic electricity pressure detection plate, DC voltage detection plate, inverter voltage detection plate, display board and power panel are mutually interconnected by bus board
It connects；Alternating voltage detection plate passes through voltage transformer（PT）The input side for connecting frequency converter, for detecting the input side of frequency converter
Alternating voltage；DC voltage detection plate connects the rectifying and wave-filtering side of frequency converter by DC voltage transmitter, for detecting frequency conversion
The rectifying and wave-filtering voltage of device；Inverter voltage detection plate connects the outlet side of frequency converter by transformer, inverse for detecting frequency converter
Become output voltage.Three detection plates of apparatus of the present invention（Alternating voltage detection plate, DC voltage detection plate and inverter voltage detection
Plate）Monitoring input ac voltage in real time, rectifying and wave-filtering voltage and inverter output voltage, when input side alternating voltage generation voltage is temporary
When drop, the recording function of trigger device（It is the storage to sampled data to have memory, device recording on master control borad）, device
Simultaneously to three road voltages（Input ac voltage, rectifying and wave-filtering voltage and inverter output voltage）Carry out recording.The present apparatus passes through record
Wave energy can analysis voltage temporarily influence of the drop to each voltage circuit of frequency converter, and then frequency converter exports when analyzing voltage dip
The influence of voltage against load.
As shown in Fig. 2, the waveform of frequency converter input voltage is AC sine wave, become direct current after current rectifying and wave filtering circuit
Then waveform becomes modulating pulse wave shape after inverter circuit.
As shown in figure 3, present invention inverter voltage detection plate suitable for the voltage dip monitoring device of frequency converter is equipped with
The input side of central processor CPU, LC filters and zero-crossing comparator, transformer T connects inversion output voltage, transformation
The input terminal of the outlet side connection LC filters of device T；The input terminal of the output end connection zero-crossing comparator of LC filters, inversion electricity
CPU input terminals are separately connected the output end of LC filters and the output end of zero-crossing comparator in pressure detection plate；CPU output ends connect
Master control borad.Inversion output voltage becomes the SPWM of small signal after transformer（Sinusoidal PWM, sinusoidal impulse
Width modulated）Waveform, small signal S PWM waveform become sine wave after LC filters, and sine wave becomes after zero-crossing comparator
At square wave, the CPU of inverter voltage detection plate calculates the frequency of sine wave, resets and adopt by being counted to above-mentioned square wave
Sample frequency, to reach frequency-tracking processing.
As shown in figure 4, the input side of inversion output voltage connection transformer T, the first end of transformer T outlet sides
One end of filter inductance L is connected, the filter inductance L other ends connect filter capacitor C, and it is defeated that the filter capacitor C other ends connect transformer T
Go out the second end of side, sampling resistor R1 is connected in parallel on the both ends filter capacitor C, and the one end sampling resistor R1 is connected to by current-limiting resistance R2
The reverse input end of operational amplifier A, the sampling resistor R1 other ends are connected to the noninverting input of operational amplifier A, and operation is put
The output end of big device A connects CPU input terminals in inverter voltage detection plate, and CPU output ends connect master control in inverter voltage detection plate
Plate.
As shown in figure 5, inversion output voltage connects transformer, the waveform of inversion output voltage（Itself
For modulating pulse wave shape）After being converted into sine wave by LC filters, square wave, inverter voltage inspection are obtained using zero-crossing comparator
CPU counts square wave and calculates the frequency of current sinusoidal wave in drafting board, then adjusts the sample frequency to sine wave, from
And reach frequency-tracking.After the impulse modulation waveform of inversion output voltage by being converted into sine wave by apparatus of the present invention
It is monitored again.
Corresponding to a kind of voltage dip device suitable for frequency converter of the embodiment of the present invention one, the embodiment of the present invention two also carries
For a kind of voltage dip monitoring method suitable for frequency converter, including：
It provides and is examined by master control borad, alternating voltage detection plate, DC voltage detection plate and inverter voltage that bus board is connected with each other
Drafting board；
The input side that the alternating voltage detection plate is connected to frequency converter by voltage transformer, detects the input top-cross of frequency converter
Galvanic electricity pressure；
The rectifying and wave-filtering side that the DC voltage detection plate is connected to frequency converter by DC voltage transmitter, detects frequency converter
Rectifying and wave-filtering voltage；
The outlet side that the inverter voltage detection plate is connected to frequency converter by transformer detects the inversion output electricity of frequency converter
Pressure.
Wherein, the voltage dip monitoring method further includes：
Central processing unit, LC filters and zero-crossing comparator are set in the inverter voltage detection plate, by the LC filters
Input terminal connect the outlet side of the transformer, the input side of the transformer connects inversion output voltage, described
The input terminal of central processing unit is separately connected the output end of the output end and the zero-crossing comparator of the LC filters, in described
The output end of central processor connects the master control borad.
Wherein, the inverter output voltage of the detection frequency converter specifically includes：
The inverter output voltage of frequency converter is converted to small signal Sinusoidal Pulse Width Modulation waveform after the transformer；
The small signal Sinusoidal Pulse Width Modulation waveform that transformer exports is converted into sine wave；
The sine wave is converted into square wave, the square wave is counted, the frequency of the sine wave is calculated, resets and adopt
Sample frequency.
The present invention is by detecting frequency converter input side alternating voltage, the recording frequency converter input simultaneously when voltage dip occurs
Alternating voltage, frequency converter rectifying and wave-filtering voltage and inversion output voltage, by can to being further processed for recorder data
Influence of the voltage dip to frequency converter rectifying and wave-filtering voltage and inversion output voltage is analyzed, and then is analyzed in voltage
Temporarily influence of the frequency converter inverter output voltage to load when drop.
In conclusion compared with prior art, the embodiment of the present invention has the advantages that：It can be defeated to frequency converter simultaneously
Enter side alternating voltage, frequency converter rectifying and wave-filtering voltage and inversion output voltage to be monitored, it will by circuit design
The impulse modulation waveform of inversion output voltage is converted into sine wave, to realize the prison to inversion output voltage
It surveys, while also having the function of frequency-tracking and frequency converter input ac voltage, rectifying and wave-filtering voltage and inversion are exported simultaneously
Voltage carries out the recording function of recording.
The above disclosure is only the preferred embodiments of the present invention, cannot limit the right model of the present invention with this certainly
It encloses, therefore equivalent changes made in accordance with the claims of the present invention, is still within the scope of the present invention.
Claims (10)
1. a kind of voltage dip monitoring device suitable for frequency converter, which is characterized in that including：
Master control borad, alternating voltage detection plate, DC voltage detection plate and the inverter voltage detection plate being connected with each other by bus board；
The alternating voltage detection plate connects the input side of frequency converter, the input side for detecting frequency converter by voltage transformer
Alternating voltage；
The DC voltage detection plate connects the rectifying and wave-filtering side of frequency converter by DC voltage transmitter, for detecting frequency converter
Rectifying and wave-filtering voltage；
The inverter voltage detection plate connects the outlet side of frequency converter by transformer, and the inversion for detecting frequency converter exports electricity
Pressure.
2. voltage dip monitoring device according to claim 1, which is characterized in that further include display board, the master control borad,
Alternating voltage detection plate, DC voltage detection plate and inverter voltage detection plate are connect by bus board with the display board.
3. voltage dip monitoring device according to claim 1, which is characterized in that further include power panel, the master control borad,
Alternating voltage detection plate, DC voltage detection plate and inverter voltage detection plate are connect by bus board with the power panel.
4. voltage dip monitoring device according to claim 1, which is characterized in that the inverter voltage detection plate is equipped with
The input terminal of central processing unit, LC filters and zero-crossing comparator, the LC filters connects the outlet side of the transformer, institute
The input side connection inversion output voltage of transformer is stated, the input terminal of the central processing unit is separately connected the LC filters
The output end of the output end of the output end of wave device and the zero-crossing comparator, the central processing unit connects the master control borad.
5. voltage dip monitoring device according to claim 4, which is characterized in that the inverter output voltage of frequency converter is through institute
Small signal Sinusoidal Pulse Width Modulation waveform is converted to after stating transformer, the LC filters are used for will be described in transformer output
Small signal Sinusoidal Pulse Width Modulation waveform is converted to sine wave, and the zero-crossing comparator is used for the sine wave side of being converted to
Wave, the central processing unit calculate the frequency of the sine wave, reset sampling frequency for being counted to the square wave
Rate.
6. voltage dip monitoring device according to claim 5, which is characterized in that the LC filters specifically include filtering
Inductance, filter capacitor and sampling resistor, the zero-crossing comparator specifically include operational amplifier and current-limiting resistance, the filtered electrical
One end of sense connects the first end of the outlet side of the transformer, and the other end connects the filter capacitor, the filter capacitor
The other end connects the second end of the outlet side of the transformer, and the sampling resistor is connected in parallel on the both ends of filter capacitor, described
One end of sampling resistor connects the reverse input end of the operational amplifier by the current-limiting resistance, the sampling resistor it is another
One end connects the noninverting input of the operational amplifier, and the output end of the operational amplifier connects the inverter voltage detection
The input terminal of central processing unit in plate.
7. voltage dip monitoring device according to claim 1, which is characterized in that the master control borad is equipped with memory,
When voltage dip occurs for the input side alternating voltage, the memory is to the input side alternating voltage, rectifying and wave-filtering electricity
Pressure and the sampled data of inverter output voltage are stored.
8. a kind of voltage dip monitoring method suitable for frequency converter, which is characterized in that including：
It provides and is examined by master control borad, alternating voltage detection plate, DC voltage detection plate and inverter voltage that bus board is connected with each other
Drafting board；
The input side that the alternating voltage detection plate is connected to frequency converter by voltage transformer, detects the input top-cross of frequency converter
Galvanic electricity pressure；
The rectifying and wave-filtering side that the DC voltage detection plate is connected to frequency converter by DC voltage transmitter, detects frequency converter
Rectifying and wave-filtering voltage；
The outlet side that the inverter voltage detection plate is connected to frequency converter by transformer detects the inversion output electricity of frequency converter
Pressure.
9. voltage dip monitoring method according to claim 8, which is characterized in that further include：
Central processing unit, LC filters and zero-crossing comparator are set in the inverter voltage detection plate, by the LC filters
Input terminal connect the outlet side of the transformer, the input side of the transformer connects inversion output voltage, described
The input terminal of central processing unit is separately connected the output end of the output end and the zero-crossing comparator of the LC filters, in described
The output end of central processor connects the master control borad.
10. voltage dip monitoring method according to claim 9, which is characterized in that the inversion of the detection frequency converter is defeated
Go out voltage to specifically include：
The inverter output voltage of frequency converter is converted to small signal Sinusoidal Pulse Width Modulation waveform after the transformer；
The small signal Sinusoidal Pulse Width Modulation waveform that transformer exports is converted into sine wave；
The sine wave is converted into square wave, the square wave is counted, the frequency of the sine wave is calculated, resets and adopt
Sample frequency.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810174987.7A CN108594034A (en) | 2018-03-02 | 2018-03-02 | Voltage sag monitoring device and method suitable for frequency converter |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810174987.7A CN108594034A (en) | 2018-03-02 | 2018-03-02 | Voltage sag monitoring device and method suitable for frequency converter |
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| CN108594034A true CN108594034A (en) | 2018-09-28 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113295908A (en) * | 2021-04-29 | 2021-08-24 | 安徽凯承源电子科技有限公司 | Distribution transformer voltage detection device |
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