CN207181643U - A kind of current transformer detection means suitable for distributed generator islanding detection - Google Patents
A kind of current transformer detection means suitable for distributed generator islanding detection Download PDFInfo
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- CN207181643U CN207181643U CN201721141404.8U CN201721141404U CN207181643U CN 207181643 U CN207181643 U CN 207181643U CN 201721141404 U CN201721141404 U CN 201721141404U CN 207181643 U CN207181643 U CN 207181643U
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Abstract
The utility model proposes a kind of current transformer detection means suitable for distributed generator islanding detection, including：Frequency signal detection circuit, voltage sensor, current sensor, synchronizing signal sample circuit, signal conditioning circuit, A/D change-over circuits, DSP control chips and display device；The input connection distributed power source of current transformer, the input of the output end rate of connections signal deteching circuit of current transformer, the input of the input summation current transformer of voltage sensor；The output end of voltage sensor connects the input of synchronizing signal sample circuit with the output end of current sensor；The output end of synchronizing signal sample circuit connects the input of signal conditioning circuit with the output end of frequency signal detection circuit, the input of the output end connection A/D change-over circuits of signal conditioning circuit, the input of the output end connection DSP control chips of A/D change-over circuits, this structure of the detecting device is simple, effectively makes detection diversification, accuracy.
Description
Technical field
The utility model category technical field of electric power system control, and in particular to one kind is applied to distributed generator islanding and detected
Current transformer detection means.
Background technology
As new energy develops.Photovoltaic is widely applied with wind-powered electricity generation distributed electricity generation system, and island effect is examined
Survey is major issue when distributed power generation is grid-connected.For the distribution based on photovoltaic generation and wind-power electricity generation etc. simultaneously
For net electricity generation system, when grid cut-off or distributed power source disconnect from power network, if grid-connected system fails to detect to stop
Electricity condition and depart from power network, it will work on and with surrounding load formed an independently-powered islanded system, that is, occur
So-called island effect.
At present, the island effect detection method of grid-connected converter is broadly divided into active (being also active detection method) and passive
Two kinds of formula (being also passive detection method).Passive type detection method is by detecting current transformer ac output end voltage, frequency, phase or humorous
The change of ripple detects island effect.But when load and current transformer power output mismatch, larger check frequency be present；No
For energy direct measurement, it is necessary to be calculated by complicated algorithm, such as voltage harmonic, output are active；Detection time length etc..Active detection
Method refers to by being subject to electric current, frequency or phase disrupted signal in the output of grid-connected converter, and detects it to line electricity
The influence of pressure.But control is more complicated；Due to the skew of frequency or phase, power network harmonic is given, reduces current transformer output
The quality of power supply.Therefore the current transformer integration test device with isolated island detection function is designed, convenient guidance system can be understood
Whether system is in island operation state, while expands detection range, the experimental rig that blind area reduces or even eliminated is seemed
It is of crucial importance.
Utility model content
In view of the shortcomings of the prior art, the utility model proposes a kind of current transformer suitable for distributed generator islanding detection
Detection means.
A kind of current transformer detection means suitable for distributed generator islanding detection, including electric current device and signal detection list
Member；
The detecting signal unit includes：Frequency signal detection circuit, voltage sensor, current sensor, synchronizing signal
Sample circuit, signal conditioning circuit, A/D change-over circuits, DSP control chips and display device；
The input connection distributed power source of the current transformer, the output end rate of connections signal detection electricity of the current transformer
The input of the input on road, the input summation current transformer of voltage sensor；The output end and electricity of the voltage sensor
The input of the output end connection synchronizing signal sample circuit of flow sensor；The output end and frequency of the synchronizing signal sample circuit
The input of the output end connection signal conditioning circuit of rate signal deteching circuit, the output end connection A/ of the signal conditioning circuit
The input of D change-over circuits, the input of the output end connection DSP control chips of the A/D change-over circuits, the DSP controls
The output end connection display device of chip.
The synchronizing signal sample circuit, including：First operational amplifier, the second operational amplifier, first resistor, second
Resistance, 3rd resistor, the 4th resistance, the 5th resistance, the first electric capacity, the second electric capacity and the 3rd electric capacity；
The negative input end of first operational amplifier is connected with its output end, the positive input of first operational amplifier
One end of end connection first resistor and one end of the first electric capacity, the other end ground connection of first electric capacity, the first resistor
Input of the other end as synchronizing signal sample circuit；The one of the output end connection second resistance of first operational amplifier
End, the other end of the second resistance are connecting one end of the second electric capacity, one end of the 4th resistance and the second operational amplifier just
Input, the other end ground connection of second electric capacity, the other end of the 4th resistance connect the output of the second operational amplifier
End, one end of the negative input end connection 3rd resistor of second operational amplifier, the other end ground connection of the 3rd resistor；Institute
State the second operational amplifier output end connect the 5th resistance one end and the 3rd electric capacity one end, the 5th resistance it is another
End connection power supply, the other end ground connection of the 3rd electric capacity, the output end of second operational amplifier are adopted as synchronizing signal
The output end of sample circuit.
Described frequency signal detection circuit, including：6th resistance, the 7th resistance, the 8th resistance, the 9th resistance, the tenth
Resistance, the 11st resistance, the 4th electric capacity, the 5th electric capacity, the 6th electric capacity, the first diode, the second diode, the 3rd diode,
4th diode, the 5th diode, triode and 555 timers；
The negative pole of first diode connects the negative pole of the second diode, one end of the 4th electric capacity, the one of the 6th resistance
End, one end of the 8th resistance, the emitter stage and 555 timers of triode, the positive pole of first diode connect the three or two pole
The negative pole of pipe, the positive pole of second diode connect the negative pole of the 4th diode, the positive pole connection of the 3rd diode the
The positive pole of four diodes, the other end of the 4th electric capacity, one end of the 5th electric capacity, one end of the 6th electric capacity, the one of the 11st resistance
End and 555 timers, the other end of the 6th resistance connect one end and 555 timers of the 7th resistance, the 7th resistance
The other end connect the other end and 555 timers of the 5th electric capacity, the other end of the 8th resistance and one end of the 9th resistance are described
The other end of 9th resistance connects 555 timers, and the other end of the 6th electric capacity connects 555 timers, the current collection of the triode
Pole connects one end of the tenth resistance, and the other end of the tenth resistance connects the other end of the 11st resistance, the five or two pole
Pipe is parallel to the both ends of the 11st resistance.
The signal conditioning circuit, including：3rd operational amplifier, four-operational amplifier, the 12nd resistance, the 13rd
Resistance, the 14th resistance, the 15th resistance, the 16th resistance, the 17th resistance, the 18th resistance, the 19th resistance, the six or two
Pole pipe and the 7th diode；
The positive input terminal of 3rd operational amplifier connects one end of the 13rd resistance, the 13rd resistance it is another
The positive pole of end connection hexode；The negative input end of 3rd operational amplifier connects one end and the 16th of the 12nd resistance
One end of resistance, the other end of the 12nd resistance connect one end of the 14th resistance, and as the letter of signal conditioning circuit
Number input, the negative input end of the other end connection four-operational amplifier of the 14th resistance, the 16th resistance
The other end connects one end of the 18th resistance and the output end of the 3rd operational amplifier, the other end connection of the 18th resistance
The negative pole of 6th diode, and as the secondary signal output end of signal conditioning circuit, the four-operational amplifier it is just defeated
Enter one end of the 15th resistance of end connection and one end of the 17th resistance, the other end of the 15th resistance connects the seven or two pole
The positive pole of pipe, and being grounded, the other end of the 17th resistance connect one end and the four-operational amplifier of the 19th resistance
Output end, the other end of the 19th resistance connect the negative pole of the 7th diode, and as the first letter of signal conditioning circuit
Number output end.
The beneficial effects of the utility model：
The utility model proposes a kind of current transformer detection means suitable for distributed generator islanding detection, this detection means
Be not only simple in structure, and easily and effectively, test operation integration；Detection diversification, accuracy can effectively be made；Exist first
It is fairly simple using the detection circuit simply to each electrical quantity in detection means, it is carried out from the signal of inverter side outflow
Collection, each electrical quantity is sent in DSP；It is different electrically using the collection of DSP control chips using the simple to operate of the device
The signal of amount, detected using different detection methods, every kind of testing result has finally been carried out logical operation or；It is finally
Detectability scope is wide, and a variety of detection methods are combined, so as to be reduced or even be disappeared the blind area of each self-sensing method
Remove, so that its detection range expands.
Brief description of the drawings
Fig. 1 is the current transformer detection means for being applied to distributed generator islanding detection in the utility model embodiment
Structured flowchart；
Fig. 2 is the circuit diagram of synchronizing signal sample circuit in the utility model embodiment；
Fig. 3 is the circuit diagram of frequency signal detection circuit in the utility model embodiment；
Fig. 4 is the circuit diagram of signal conditioning circuit in the utility model embodiment；
Fig. 5 is the interface circuit of AD7656 and DSP control chips TMS320F2812 in the utility model embodiment
Figure.
Embodiment
The utility model embodiment is described in detail below in conjunction with the accompanying drawings.
A kind of current transformer detection means suitable for distributed generator islanding detection, as shown in figure 1, including current transformer and letter
Number detection unit；
The detecting signal unit includes：Frequency signal detection circuit, voltage sensor, current sensor, synchronizing signal
Sample circuit, signal conditioning circuit, A/D change-over circuits and DSP control chips and display device.
The input connection distributed power source of the current transformer, the output end connection signal deteching circuit of the current transformer
Input, voltage sensor input summation current transformer input；The output end and electric current of the voltage sensor pass
The input of the output end connection synchronizing signal sample circuit of sensor；Output end and the frequency letter of the synchronizing signal sample circuit
Number detection circuit output end connection signal conditioning circuit input, the signal conditioning circuit output end connection A/D turn
Change the input of circuit, the input of the output end connection DSP control chips of the A/D change-over circuits, the DSP control chips
Output end connection display device.
The synchronizing signal sample circuit, as shown in Fig. 2 including：First operational amplifier A1, the second operational amplifier A2、
First resistor R1, second resistance R2, 3rd resistor R3, the 4th resistance R4, the 5th resistance R5, the first electric capacity C1, the second electric capacity C2With
3rd electric capacity C3。
First operational amplifier A1Negative input end be connected with its output end, first operational amplifier A1Just
Input connection first resistor R1One end and the first electric capacity C1One end, the first electric capacity C1Other end ground connection, described the
One resistance R1Input of the other end as synchronizing signal sample circuit；First operational amplifier A1Output end connection
Second resistance R2One end, the second resistance R2The other end connect the second electric capacity C2One end, the 4th resistance R4One end and
Second operational amplifier A2Positive input terminal, the second electric capacity C2The other end ground connection, the 4th resistance R4The other end connect
Connect the second operational amplifier A2Output end, second operational amplifier A2Negative input end connection 3rd resistor R3One end,
The 3rd resistor R3The other end ground connection；Second operational amplifier A2Output end connect the 5th resistance R5One end and
3rd electric capacity C3One end, the 5th resistance R5The other end connection power supply, the 3rd electric capacity C3The other end ground connection, institute
State the second operational amplifier A2Output end of the output end as synchronizing signal sample circuit.
Described frequency signal detection circuit, as shown in figure 3, including：6th resistance R6, the 7th resistance R7, the 8th resistance
R8, the 9th resistance R9, the tenth resistance R10, the 11st resistance R11, the 4th electric capacity C4, the 5th electric capacity C5, the 6th electric capacity C6, the one or two
Pole pipe D1, the second diode D2, the 3rd diode D3, the 4th diode D4, the 5th diode D5, triode NPN and 555 timing
Device.
The first diode D1Negative pole connect the second diode D2Negative pole, the 4th electric capacity C4One end, the 6th resistance
R6One end, the 8th resistance R8One end, triode NPN emitter stage and 4,8 pins of 555 timers, first diode
D1Positive pole connect the 3rd diode D3Negative pole, the second diode D2Positive pole connect the 4th diode D4Negative pole, institute
State the 3rd diode D3Positive pole connect the 4th diode D4Positive pole, the 4th electric capacity C4The other end, the 5th electric capacity C5One
End, the 6th electric capacity C6One end, the 11st resistance R11One end and 555 timers 1 pin, the 6th resistance R6It is another
The 7th resistance R of end connection7One end and 555 timers 7 pins, the 7th resistance R7The other end connect the 5th electric capacity C5
The other end and 555 timer 2s, 6 pins, the 8th resistance R8The other end and the 9th resistance R9One end, the 9th resistance R9
The other end connect 555 timers 3 pins, the 6th electric capacity C6The other end connect 555 timers 5 pins, three pole
Pipe NPN colelctor electrode connects the tenth resistance R10One end, the tenth resistance R10The other end connect the 11st resistance R11It is another
One end, the 5th diode D5It is parallel to the 11st resistance R11Both ends.
The signal conditioning circuit, as shown in figure 4, including：3rd operational amplifier A3, four-operational amplifier A4, the tenth
Two resistance R12, the 13rd resistance R13, the 14th resistance R14, the 15th resistance R15, the 16th resistance R16, the 17th resistance R17、
18th resistance R18, the 19th resistance R19, the 6th diode D6With the 7th diode D7。
3rd operational amplifier A3Positive input terminal connect the 13rd resistance R13One end, the 13rd resistance R13
The other end connection hexode positive pole；3rd operational amplifier A3Negative input end connect the 12nd resistance R12One
End and the 16th resistance R16One end, the 12nd resistance R12The other end connect the 14th resistance R14One end, and conduct
The signal input part Vi, the 14th resistance R of signal conditioning circuit14Other end connection four-operational amplifier A4It is negative defeated
Enter end, the 16th resistance R16The other end connect the 18th resistance R18One end and the 3rd operational amplifier A3Output
End, the 18th resistance R18The other end connect the 6th diode D6Negative pole, and as signal conditioning circuit second letter
Number output end vo 2, the four-operational amplifier A4Positive input terminal connect the 15th resistance R15One end and the 17th resistance
R17One end, the 15th resistance R15The other end connect the 7th diode D7Positive pole, and be grounded, the 17th resistance
R17The other end connect the 19th resistance R19One end and four-operational amplifier A4Output end, the 19th resistance R19
The other end connect the 7th diode D7Negative pole, and as the first signal output part Vol of signal conditioning circuit.
In present embodiment, A/D change-over circuits include three A/D conversion chips, and three A/D conversion chips cascades；Choosing
A/D conversion chip models AD7656, every AD7656 chip can realize the synchronous acquisition of six road signals, three
AD7656 chips can realize the synchronous acquisition of 18 road signals, realize the function of analog to digital conversion circuit, and by the number after conversion
Word signal is sent to DSP.
It is illustrated in figure 5 AD7656 and DSP control chips TMS320F2812 interface circuit figure, AD7656 VDR,
RST, CON [ABC], RD, CS, BUSY pin connect TMS320F2812 DVDD, ADC_RST, PWM1, RE, IS, INT1_ respectively
BIO pins, AD7656 D [0]~D [15] pin connection TMS320F2812 D0~D15 pins, AD7656 DGND pins
Connect TMS320F2812 VSSPin is simultaneously grounded, and AD7656 WR, STDBY pin is connected with+3.3V power supplys, AD7656's
Beat/SSEL, SER, RANGE, W/B pin is connected and is grounded.
The detailed process detected using the above-mentioned current transformer detection means suitable for distributed generator islanding detection
It is as follows：
The voltage signal of current transformer output is gathered by voltage sensor, passes through current sensor and gathers what current transformer exported
Current signal, the sampling frequency signal of current transformer output is gathered by frequency signal detection circuit.
The current signal of voltage signal and the current transformer output exported by synchronizing signal sample circuit to current transformer is carried out
Synchronization process.
By signal conditioning circuit and A/D change-over circuits by the voltage signal after synchronization process, the electric current after synchronization process
Signal, and the sampling frequency signal of current transformer output are converted to data signal.
DSP control chips are calculated according to the digital quantity of the magnitude of voltage after analog-to-digital conversion, current value and frequency values, inspection
Survey whether distributed power source is in island state, if distributed power source is in island state, shown by display device
Alarm.
Claims (4)
1. a kind of current transformer detection means suitable for distributed generator islanding detection, it is characterised in that including electric current device and letter
Number detection unit；
The detecting signal unit includes：Frequency signal detection circuit, voltage sensor, current sensor, synchronizing signal sampling
Circuit, signal conditioning circuit, A/D change-over circuits, DSP control chips and display device；
The input connection distributed power source of the current transformer, the output end rate of connections signal deteching circuit of the current transformer
Input, voltage sensor input summation current transformer input；The output end and electric current of the voltage sensor pass
The input of the output end connection synchronizing signal sample circuit of sensor；Output end and the frequency letter of the synchronizing signal sample circuit
Number detection circuit output end connection signal conditioning circuit input, the signal conditioning circuit output end connection A/D turn
Change the input of circuit, the input of the output end connection DSP control chips of the A/D change-over circuits, the DSP control chips
Output end connection display device.
2. the current transformer detection means according to claim 1 suitable for distributed generator islanding detection, it is characterised in that
The synchronizing signal sample circuit, including：First operational amplifier, the second operational amplifier, first resistor, second resistance,
Three resistance, the 4th resistance, the 5th resistance, the first electric capacity, the second electric capacity and the 3rd electric capacity；
The negative input end of first operational amplifier is connected with its output end, and the positive input terminal of first operational amplifier connects
Connect one end of first resistor and one end of the first electric capacity, the other end ground connection of first electric capacity, the first resistor it is another
Hold the input as synchronizing signal sample circuit；One end of the output end connection second resistance of first operational amplifier,
The other end of the second resistance connects one end, one end of the 4th resistance and the positive input of the second operational amplifier of the second electric capacity
End, the other end ground connection of second electric capacity, the other end of the 4th resistance connect the output end of the second operational amplifier, institute
State one end of the negative input end connection 3rd resistor of the second operational amplifier, the other end ground connection of the 3rd resistor；Described
The output end of two operational amplifiers connects one end of the 5th resistance and one end of the 3rd electric capacity, and the other end of the 5th resistance connects
Power supply, the other end ground connection of the 3rd electric capacity are connect, the output end of second operational amplifier samples electricity as synchronizing signal
The output end on road.
3. the current transformer detection means according to claim 1 suitable for distributed generator islanding detection, it is characterised in that
Described frequency signal detection circuit, including：6th resistance, the 7th resistance, the 8th resistance, the 9th resistance, the tenth resistance, the tenth
One resistance, the 4th electric capacity, the 5th electric capacity, the 6th electric capacity, the first diode, the second diode, the 3rd diode, the four or two pole
Pipe, the 5th diode, triode and 555 timers；
The negative pole connection negative pole of the second diode of first diode, one end of the 4th electric capacity, one end of the 6th resistance, the
One end of eight resistance, the emitter stage of triode and 555 timers, the positive pole of first diode connect the negative of the 3rd diode
Pole, the positive pole of second diode connect the negative pole of the 4th diode, and the positive pole of the 3rd diode connects the four or two pole
The positive pole of pipe, the other end of the 4th electric capacity, one end of the 5th electric capacity, one end, one end and 555 of the 11st resistance of the 6th electric capacity
Timer, the other end of the 6th resistance connect one end and 555 timers of the 7th resistance, the other end of the 7th resistance
Connect the other end and 555 timers of the 5th electric capacity, the other end of the 8th resistance and one end of the 9th resistance, the 9th resistance
The other end connect 555 timers, the other end of the 6th electric capacity connects 555 timers, the colelctor electrode connection of the triode the
One end of ten resistance, the other end of the tenth resistance connect the other end of the 11st resistance, the 5th diodes in parallel in
The both ends of 11st resistance.
4. the current transformer detection means according to claim 1 suitable for distributed generator islanding detection, it is characterised in that
The signal conditioning circuit, including：3rd operational amplifier, four-operational amplifier, the 12nd resistance, the 13rd resistance,
14 resistance, the 15th resistance, the 16th resistance, the 17th resistance, the 18th resistance, the 19th resistance, the 6th diode and
7th diode；
The positive input terminal of 3rd operational amplifier connects one end of the 13rd resistance, and the other end of the 13rd resistance connects
Connect the positive pole of hexode；The negative input end of 3rd operational amplifier connects one end and the 16th resistance of the 12nd resistance
One end, the other end of the 12nd resistance connects one end of the 14th resistance, and defeated as the signal of signal conditioning circuit
Enter end, the 14th resistance the other end connection four-operational amplifier negative input end, the 16th resistance it is another
One end of the 18th resistance of end connection and the output end of the 3rd operational amplifier, the other end connection the 6th of the 18th resistance
The negative pole of diode, and as the secondary signal output end of signal conditioning circuit, the positive input terminal of the four-operational amplifier
One end of the 15th resistance and one end of the 17th resistance are connected, the other end of the 15th resistance connects the 7th diode
Positive pole, and be grounded, the other end of the 17th resistance connects one end of the 19th resistance and the output of four-operational amplifier
End, the other end of the 19th resistance connect the negative pole of the 7th diode, and defeated as the first signal of signal conditioning circuit
Go out end.
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| CN201721141404.8U CN207181643U (en) | 2017-09-07 | 2017-09-07 | A kind of current transformer detection means suitable for distributed generator islanding detection |
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| CN201721141404.8U CN207181643U (en) | 2017-09-07 | 2017-09-07 | A kind of current transformer detection means suitable for distributed generator islanding detection |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107390141A (en) * | 2017-09-07 | 2017-11-24 | 国网辽宁省电力有限公司 | A kind of current transformer detection means and method suitable for distributed generator islanding detection |
| CN108732493A (en) * | 2018-06-21 | 2018-11-02 | 沈阳工业大学 | A kind of experimental rig and method being suitable for measuring arc voltage |
| CN110308678A (en) * | 2019-06-12 | 2019-10-08 | 台州凯思拉智能科技有限公司 | A kind of safety detection circuit, device and stamping equipment |
| CN113252962A (en) * | 2021-05-13 | 2021-08-13 | 国网黑龙江省电力有限公司电力科学研究院 | Wireless detection device for current of insulation sample under direct-current high voltage of converter transformer |
-
2017
- 2017-09-07 CN CN201721141404.8U patent/CN207181643U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107390141A (en) * | 2017-09-07 | 2017-11-24 | 国网辽宁省电力有限公司 | A kind of current transformer detection means and method suitable for distributed generator islanding detection |
| CN108732493A (en) * | 2018-06-21 | 2018-11-02 | 沈阳工业大学 | A kind of experimental rig and method being suitable for measuring arc voltage |
| CN110308678A (en) * | 2019-06-12 | 2019-10-08 | 台州凯思拉智能科技有限公司 | A kind of safety detection circuit, device and stamping equipment |
| CN113252962A (en) * | 2021-05-13 | 2021-08-13 | 国网黑龙江省电力有限公司电力科学研究院 | Wireless detection device for current of insulation sample under direct-current high voltage of converter transformer |
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Granted publication date: 20180403 Termination date: 20210907 |