CN107589283A - Intelligent transformer substation grounding network potential difference Jamming Signal Simulation waveform generator - Google Patents
Intelligent transformer substation grounding network potential difference Jamming Signal Simulation waveform generator Download PDFInfo
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- CN107589283A CN107589283A CN201711068215.7A CN201711068215A CN107589283A CN 107589283 A CN107589283 A CN 107589283A CN 201711068215 A CN201711068215 A CN 201711068215A CN 107589283 A CN107589283 A CN 107589283A
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Abstract
The invention discloses a kind of intelligent transformer substation grounding network potential difference Jamming Signal Simulation waveform generator, it is characterised in that：Including upper PC and signal generator main frame two parts, the signal generator main frame includes FPGA controller, digital isolation circuit A, digital isolation circuit B, D/A converting circuit, signal conditioning circuit, signal back production circuit；The host computer is connected to FPGA controller by ethernet communication interface, and FPGA controller is connected to D/A converting circuit through digital isolation circuit A, and D/A converting circuit is connected to signal output part after signal conditioning circuit again；FPGA controller is connected to signal back production circuit through digital isolation circuit B, and the output of signal back production circuit is connected to signal output part.This signal generator can generate the intelligent transformer substation grounding network potential difference interference signal of emulation, and be converted into analog signal output by digital analog converter, be applied to collecting unit, complete test.
Description
Technical field
The present invention relates to intelligent substation field, and in particular to a kind of intelligent transformer substation grounding network potential difference interference signal is imitated
True waveform generator.
Background technology
Intelligent substation disconnecting switch, breaker are operated or disconnecting switch, breaker occur earth fault when,
Considerably more intense fast transient overvoltage VFTO can be produced, VFTO is distributed in the grounded screen of electronic mutual inductor, is formed strong
Grounded screen potential difference interference signal, and be coupled to the collecting unit of electronic mutual inductor front end, cause collecting unit to work out
Now abnormal, reset, possibly even collector is caused to damage, so as to have influence on the stable operation of whole system.Therefore need to electricity
The principle and the form of expression of minor transformer collecting unit grounded screen interference are analyzed, and are proposed reliable and effective anti-interference are arranged
Apply.
For the mechanism and the form of expression of electronic mutual inductor collecting unit grounded screen interference of analyzing and researching, and propose electronics
The interference protection measure of formula transformer collecting unit reply grounded screen interference, the present invention propose a kind of intelligent transformer substation grounding network current potential
Poor Jamming Signal Simulation waveform generator, turn for simulating intelligent transformer substation grounding network potential difference interference signal, and by digital-to-analogue
Parallel operation is converted into analog signal output, is applied to the collecting unit of electronic mutual inductor front end, completes grounded screen interference principle and surveys
Examination, to verify interference protection measure.
The content of the invention
To solve deficiency of the prior art, the present invention provides a kind of intelligent transformer substation grounding network potential difference interference signal and imitated
True waveform generator, the generator can generate the intelligent transformer substation grounding network potential difference interference signal of emulation, and be turned by digital-to-analogue
Parallel operation is converted into analog signal output, is applied to collecting unit, completes test.
In order to realize above-mentioned target, the present invention adopts the following technical scheme that：A kind of intelligent transformer substation grounding network potential difference is done
Disturb signal simulation waveform generator, it is characterised in that：Including upper PC and signal generator main frame two parts, the signal hair
Raw device main frame include FPGA controller, digital isolation circuit A, digital isolation circuit B, D/A converting circuit, signal conditioning circuit,
Signal back production circuit；The host computer is connected to FPGA controller by ethernet communication interface, FPGA controller through numeral every
D/A converting circuit is connected to from circuit A, D/A converting circuit is connected to signal output part after signal conditioning circuit again；
FPGA controller is connected to signal back production circuit through digital isolation circuit B, and the output of signal back production circuit is connected to signal output
End.
A kind of foregoing intelligent transformer substation grounding network potential difference Jamming Signal Simulation waveform generator, it is characterized in that：It is described
Host computer is used under the recorder data and nominal situation of field measurement acquisition intelligent transformer substation grounding network potential difference interference signal
Fundamental wave data, which merge, imports signal generator main frame.
A kind of foregoing intelligent transformer substation grounding network potential difference Jamming Signal Simulation waveform generator, it is characterized in that：It is described
Digital isolation circuit A, digital isolation circuit B use ADUM262N digital isolators.
A kind of foregoing intelligent transformer substation grounding network potential difference Jamming Signal Simulation waveform generator, it is characterized in that：It is described
D/A converting circuit uses AD9117 digital analog converters.
A kind of foregoing intelligent transformer substation grounding network potential difference Jamming Signal Simulation waveform generator, it is characterized in that：It is described
Signal conditioning circuit includes DAC Buffer, and the differential signal DAC+ of input is grounded by resistance R9, the differential signal DAC- of input
It is grounded by resistance R10, electric capacity C9 is in parallel with resistance R9, and electric capacity C10 is in parallel with resistance R10；Differential signal DAC+ is through resistance R1
Positive differential input+the IN, differential signal DAC- for being connected to DAC Buffer D7 are connected to the negative of DAC Buffer D7 through resistance R2
Differential input end-IN；DAC Buffer D7 positive supply input+VS is grounded after electric capacity C1 parallel with one another, electric capacity C2, D7
Negative supply input-VS be grounded after electric capacity C3 parallel with one another, electric capacity C4；DAC Buffer D7 PD signal ends pass through electricity
Hinder R4 pull-up；DAC Buffer D7 OUT signal end is connected to D7 FB signal ends, D7 through resistance R5 parallel with one another, electric capacity C5
FB signal ends D7 REF signal end is connected to through resistance R6 parallel with one another, electric capacity C6；DAC Buffer D7 REF signal end
It is connected to potentiometer RL1 central contact；DAC Buffer D7 OUT signal end is connected to signal output VOUT through resistance R7, together
When D7 OUT signal end be connected to operational amplifier D8 positive input, operational amplifier D8 reverse input end is connected to
D8 output end, D8 output end are connected to feedback signal V_FEEK output ends.
A kind of foregoing intelligent transformer substation grounding network potential difference Jamming Signal Simulation waveform generator, it is characterized in that：It is described
Signal back production circuit is used to gather the analog signal through signal conditioning circuit output and convert thereof into digital quantity to be sent to FPGA
Controller, signal back production circuit realize analog-to-digital conversion using AD7606-4.
A kind of foregoing intelligent transformer substation grounding network potential difference Jamming Signal Simulation waveform generator, it is characterized in that：It is described
FPGA controller uses the XC3SD3400A field programmable gate arrays of XILINX companies.
The beneficial effect that the present invention is reached：
(1) present invention by host computer to be configured, Data Integration, it is more square than general signal generator use
Just, flexibly, it is with better function；
(2) it is used to test using the interference waveform recorder data of intelligent substation field measurement, specific aim is stronger, can be true
Simulate the interference at intelligent substation scene；
(3) by the way that digital loop and analog loopback are carried out into digital isolation, the influence of noise of digital loop is avoided to simulating
Signal, so as to obtain higher output accuracy；
(4) by being sampled to output signal, and feed back to FPGA controller and output signal adjusted in real time, it is ensured that
The degree of accuracy of output signal.
Brief description of the drawings
Fig. 1 is the schematic block circuit diagram of the present invention；
Fig. 2 is signal conditioning circuit structure chart.
Embodiment
The invention will be further described below in conjunction with the accompanying drawings.Following examples are only used for clearly illustrating the present invention
Technical scheme, and can not be limited the scope of the invention with this.
As shown in figure 1, a kind of intelligent transformer substation grounding network potential difference Jamming Signal Simulation waveform generator, including upper PC
Machine and signal generator main frame two parts, wherein signal generator main frame include FPGA controller, digital isolation circuit A, numeral
Isolation circuit B, D/A converting circuit, signal conditioning circuit, signal back production circuit；Host computer is connected by ethernet communication interface
To the FPGA controller of signal generator main frame, FPGA controller is connected to D/A converting circuit, digital-to-analogue through digital isolation circuit A
Change-over circuit is connected to signal output part after signal conditioning circuit again；FPGA controller is connected to through digital isolation circuit B
Signal back production circuit, the output of signal back production circuit are also connected to signal output part.
The signal generator can generate the intelligent transformer substation grounding network potential difference interference signal of emulation, and pass through digital-to-analogue conversion
Device is converted into analog signal output, is applied to collecting unit, completes test.
The host computer is used for the recorder data that field measurement is obtained to intelligent transformer substation grounding network potential difference interference signal
Merge with fundamental wave data under nominal situation, arrange, generate new Wave data and import signal generator main frame；Host computer and master
Communicated between machine by ether net mode, configured and instructed by host computer and issue, can be realized pair using this mode
The simulation waveform of main frame output is flexibly set, including is carved at the beginning of settable superposition interference, interference time, and simulation electronic formula is mutual
The simulation waveform after interference signal is superimposed under the operating modes such as sensor zero load, on-load, the electronic type that can also simulate different principle is mutual
Waveform after sensor superposition interference signal.
The FPGA controller uses the XC3SD3400A field programmable gate arrays of XILINX companies.FPGA controller is
The core of signal generator main frame, controlled for receiving instruction and the Wave data that host computer issues, and through digital isolation circuit A
Wave data is converted into analog signal by D/A converting circuit, while FPGA controller is also through digital isolation circuit B control signals
Back production circuit completes the sampling and digital-to-analogue conversion of the analog signal to signal conditioning circuit output, and reception signal back production circuit passes through
The data of digital isolation circuit B feedbacks.The waveform that the feedback data and FPGA controller that are obtained from signal back production circuit are issued
Data are compared, and adjust the analog signal of output accordingly, realize the closed-loop control to signal generator output signal, really
Protect the degree of accuracy of output signal.
The digital isolation circuit A, digital isolation circuit B use ADUM262N digital isolators.Digital isolation circuit
For carrying out electrical isolation to FPGA controller and D/A converting circuit and signal back production circuit, making an uproar for digital circuits section is prevented
Acoustic jamming is to the signal of analog loopback so as to influenceing the precision of signal output.
D/A converting circuit uses AD9117 digital analog converters.AD9117 has 14 bit resolutions, 125MSPS conversion speed
The features such as rate, low-power consumption, meet grounded screen potential difference interference simulation demand.
The signal that signal conditioning circuit is used for the output of logarithm analog conversion circuit is nursed one's health.Due to AD9117 digital analog converters
Exported for differential current mode, therefore the differential signal for being exported AD9117 by DAC Buffer carries out conditioning and is amplified and converted to
Voltage signal exports.The DAC Buffer uses AD8130.AD8130 is a preferable complementary elements, has larger put down
Weighing apparatus input impedance, and there is outstanding exchange common mode rejection performance.AD8130 frequency response bandwidths are 270MHz, support AD9117
In a maximum of about of 40MHz output frequency caused by maximum slew rate.
As shown in Fig. 2 the schematic diagram for output signal conditioning circuit.
In figure, the differential signal DAC+ of input is grounded by resistance R9, and the differential signal DAC- of input is connect by resistance R10
Ground, resistance R9, resistance R10 are used to the current signal of input being transformed into voltage signal.Electric capacity C9 is in parallel with resistance R9, electric capacity
C10 is in parallel with resistance R10, for reducing signal noise.
Differential signal DAC+ is connected to DAC Buffer D7 positive differential input+IN, differential signal DAC- warp through resistance R1
Resistance R2 is connected to DAC Buffer D7 negative differential input end-IN, and series resistance R1, R2 are for improving Differential input circuit
Overall distortion performance, resistance R1, resistance R2 resistances are 49.9 Ω, and its precision is 0.1%, temperature stability 5ppm.
DAC Buffer D7 positive supply input+VS is grounded after electric capacity C1 parallel with one another, electric capacity C2, D7 negative electricity
Source input-VS is grounded after electric capacity C3 parallel with one another, electric capacity C4, electric capacity C1, electric capacity C2, electric capacity C3, electric capacity C4 be used for pair
Power decoupling.
DAC Buffer D7 PD signal ends are pulled up by resistance R4, to exit power down protection pattern.
DAC Buffer D7 OUT signal end is connected to D7 FB signal ends, D7 through resistance R5 parallel with one another, electric capacity C5
FB signal ends D7 REF signal end is connected to through resistance R6 parallel with one another, electric capacity C6, resistance R5, resistance R6 are used to set
The gain of signal conditioning circuit, electric capacity C5, electric capacity C6 are used to filter out signal noise.DAC Buffer D7 REF signal end is connected to
Potentiometer RL1 central contact, DAC Buffer D7 output signal can be modified by adjusting potentiometer RL1.
DAC Buffer D7 OUT signal end is connected to signal output VOUT, while D7 OUT signal end through resistance R7
Operational amplifier D8 positive input is connected to, operational amplifier D8 reverse input end is connected to D8 output end, D8's
Output end is connected to feedback signal V_FEEK output ends.The operational amplifier D8 replicates output signal as voltage follower
Produce feedback signal V_FEEK, there is provided gather to signal back production circuit.
Signal back production circuit is used to gather the analog signal through signal conditioning circuit output and converts thereof into digital quantity hair
Give FPGA controller.Signal back production circuit realizes analog-to-digital conversion using AD7606-4.AD7606-4 be a 16 bit resolution,
Charge scaling, gradual approaching A/D converter, are powered using single supply, built-in frequency overlapped-resistable filter and reference voltage source,
Simulation input impedance reaches 1M Ω, therefore without carrying out preposition conditioning to input signal.
In addition, in the design, to ensure good overall performance, radio frequency circuit board placement-and-routing technology should be used to carry out
Design and making sheet.All ground planes and bus plane below the simulation output and amplifier pin of high-speed A/D converter should be free of
Copper, prevent from forming parasitic capacitance between ground connection input, output pin.Input, output end resistance, shunt capacitance should be as close to
High speed device, output loading ground connection and shunt capacitance ground connection should be back to the same point on ground plane, so that cabling stray inductance,
Jingle bell vibration is minimum.
Described above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, without departing from the technical principles of the invention, some improvement and deformation can also be made, these are improved and deformation
Also it should be regarded as protection scope of the present invention.
Claims (7)
- A kind of 1. intelligent transformer substation grounding network potential difference Jamming Signal Simulation waveform generator, it is characterised in that：Including upper PC Machine and signal generator main frame two parts, the signal generator main frame include FPGA controller, digital isolation circuit A, numeral Isolation circuit B, D/A converting circuit, signal conditioning circuit, signal back production circuit；The host computer passes through ethernet communication interface FPGA controller is connected to, FPGA controller is connected to D/A converting circuit through digital isolation circuit A, and D/A converting circuit passes through again Signal output part is connected to after crossing signal conditioning circuit；FPGA controller is connected to signal back production circuit through digital isolation circuit B, The output of signal back production circuit is connected to signal output part.
- 2. a kind of intelligent transformer substation grounding network potential difference Jamming Signal Simulation waveform generator according to claim 1, its It is characterized in：The host computer be used for by field measurement obtain intelligent transformer substation grounding network potential difference interference signal recorder data with Fundamental wave data, which merge, under nominal situation imports signal generator main frame.
- 3. a kind of intelligent transformer substation grounding network potential difference Jamming Signal Simulation waveform generator according to claim 1, its It is characterized in：The digital isolation circuit A, digital isolation circuit B use ADUM262N digital isolators.
- 4. a kind of intelligent transformer substation grounding network potential difference Jamming Signal Simulation waveform generator according to claim 1, its It is characterized in：The D/A converting circuit uses AD9117 digital analog converters.
- 5. a kind of intelligent transformer substation grounding network potential difference Jamming Signal Simulation waveform generator according to claim 1, its It is characterized in：The signal conditioning circuit includes DAC Buffer, and the differential signal DAC+ of input is grounded by resistance R9, input Differential signal DAC- is grounded by resistance R10, and electric capacity C9 is in parallel with resistance R9, and electric capacity C10 is in parallel with resistance R10；Differential signal Positive differential input+the IN, differential signal DAC- that DAC+ is connected to DAC Buffer D7 through resistance R1 are connected to DAC through resistance R2 Buffer D7 negative differential input end-IN；DAC Buffer D7 positive supply input+VS is through electric capacity C1 parallel with one another, electric capacity It is grounded after C2, D7 negative supply input-VS is grounded after electric capacity C3 parallel with one another, electric capacity C4；DAC Buffer D7 PD letters Number end is pulled up by resistance R4；DAC Buffer D7 OUT signal end is connected to D7's through resistance R5 parallel with one another, electric capacity C5 FB signal ends, D7 FB signal ends are connected to D7 REF signal end through resistance R6 parallel with one another, electric capacity C6；DAC Buffer D7 REF signal end be connected to potentiometer RL1 central contact；DAC Buffer D7 OUT signal end is connected to signal through resistance R7 VOUT is exported, while D7 OUT signal end is connected to operational amplifier D8 positive input, operational amplifier D8's is reverse defeated Enter the output end that end is connected to D8, D8 output end is connected to feedback signal V_FEEK output ends.
- 6. a kind of intelligent transformer substation grounding network potential difference Jamming Signal Simulation waveform generator according to claim 1, its It is characterized in：The signal back production circuit is used to gather the analog signal through signal conditioning circuit output and converts thereof into digital quantity FPGA controller is sent to, signal back production circuit realizes analog-to-digital conversion using AD7606-4.
- 7. a kind of intelligent transformer substation grounding network potential difference Jamming Signal Simulation waveform generator according to claim 1, its It is characterized in：The FPGA controller uses the XC3SD3400A field programmable gate arrays of XILINX companies.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108801892A (en) * | 2018-06-19 | 2018-11-13 | 国家电网公司 | Grounding net of transformer substation corrosion diagnosis method and system |
| CN109557495A (en) * | 2018-12-21 | 2019-04-02 | 中国电力科学研究院有限公司 | For the transient characterisitics method of calibration of DC current associated loop, system, device |
| CN109768572A (en) * | 2019-02-01 | 2019-05-17 | 东南大学 | Collect the power information numerical model analysis emulation platform of system towards photovoltaic DC boosting |
| CN110988568A (en) * | 2019-12-26 | 2020-04-10 | 易思维（杭州）科技有限公司 | Electronic equipment stability detection device and method |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201616023U (en) * | 2010-03-16 | 2010-10-27 | 周卫 | Signal isolation conversion output module |
| CN203609422U (en) * | 2013-11-13 | 2014-05-28 | 杭州电子科技大学 | Palm impedance spectrometer |
| CN104483520A (en) * | 2014-12-17 | 2015-04-01 | 国家电网公司 | Customized increment signal generator and calibration instrument |
| CN105141560A (en) * | 2015-07-16 | 2015-12-09 | 中国电子科技集团公司第四十一研究所 | Multisystem signal simulation device and method |
| CN205898852U (en) * | 2016-08-15 | 2017-01-18 | 北京博电新力电气股份有限公司 | System takes place for base mark signal |
| CN106908637A (en) * | 2017-02-20 | 2017-06-30 | 京信通信技术(广州)有限公司 | Signal source analogue means |
| CN107184211A (en) * | 2017-06-15 | 2017-09-22 | 南京邮电大学 | A kind of multifrequency electrical impedance imaging device based on FPGA |
| CN207396559U (en) * | 2017-11-03 | 2018-05-22 | 国网江苏省电力公司电力科学研究院 | Intelligent transformer substation grounding network potential difference Jamming Signal Simulation waveform generator |
-
2017
- 2017-11-03 CN CN201711068215.7A patent/CN107589283A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201616023U (en) * | 2010-03-16 | 2010-10-27 | 周卫 | Signal isolation conversion output module |
| CN203609422U (en) * | 2013-11-13 | 2014-05-28 | 杭州电子科技大学 | Palm impedance spectrometer |
| CN104483520A (en) * | 2014-12-17 | 2015-04-01 | 国家电网公司 | Customized increment signal generator and calibration instrument |
| CN105141560A (en) * | 2015-07-16 | 2015-12-09 | 中国电子科技集团公司第四十一研究所 | Multisystem signal simulation device and method |
| CN205898852U (en) * | 2016-08-15 | 2017-01-18 | 北京博电新力电气股份有限公司 | System takes place for base mark signal |
| CN106908637A (en) * | 2017-02-20 | 2017-06-30 | 京信通信技术(广州)有限公司 | Signal source analogue means |
| CN107184211A (en) * | 2017-06-15 | 2017-09-22 | 南京邮电大学 | A kind of multifrequency electrical impedance imaging device based on FPGA |
| CN207396559U (en) * | 2017-11-03 | 2018-05-22 | 国网江苏省电力公司电力科学研究院 | Intelligent transformer substation grounding network potential difference Jamming Signal Simulation waveform generator |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108801892A (en) * | 2018-06-19 | 2018-11-13 | 国家电网公司 | Grounding net of transformer substation corrosion diagnosis method and system |
| CN108801892B (en) * | 2018-06-19 | 2020-09-29 | 国家电网公司 | Transformer substation grounding grid corrosion diagnosis method and system |
| CN109557495A (en) * | 2018-12-21 | 2019-04-02 | 中国电力科学研究院有限公司 | For the transient characterisitics method of calibration of DC current associated loop, system, device |
| CN109768572A (en) * | 2019-02-01 | 2019-05-17 | 东南大学 | Collect the power information numerical model analysis emulation platform of system towards photovoltaic DC boosting |
| CN110988568A (en) * | 2019-12-26 | 2020-04-10 | 易思维（杭州）科技有限公司 | Electronic equipment stability detection device and method |
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