CN207263838U - A kind of detection device of static reactive generator - Google Patents
A kind of detection device of static reactive generator Download PDFInfo
- Publication number
- CN207263838U CN207263838U CN201720812471.1U CN201720812471U CN207263838U CN 207263838 U CN207263838 U CN 207263838U CN 201720812471 U CN201720812471 U CN 201720812471U CN 207263838 U CN207263838 U CN 207263838U
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- Prior art keywords
- resistance
- circuit
- voltage
- detection device
- static reactive
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Abstract
The utility model discloses a kind of detection device of static reactive generator, for providing signal to A/D converter (5), including voltage transformer (1), current transformer (2), zero-crossing comparator (3), PLL synchronous sampling circuit circuit (4) and voltage zero-crossing detection circuit (6), the voltage transformer (1), voltage zero-crossing detection circuit (6) and A/D converter (5) are sequentially connected；The current transformer (2) is connected with the shown A/D converter (5)；The zero-crossing comparator (3), PLL synchronous sampling circuit circuit (4) and A/D converter (5) are sequentially connected.The sensor for solving detection circuit produces the interference problem of certain lagging influence and null offset to voltage jump in itself.Improve the real-time of static reactive generator.
Description
Technical field
The utility model belongs to Power Electronic Technique, and in particular to a kind of detection device of static reactive generator.
Background technology
Many electrical equipments are worked according to electromagnetic induction principle, such as distribution transformer, motor, they are all
The conversion and transmission of energy could be carried out by alternating magnetic field is established.For the electric work for establishing alternating magnetic field and inducting flux needs
Rate is known as reactive power, and therefore, so-called " idle " is not the electrical power of " useless ", only its power and is not converted into
Mechanical energy, thermal energy；Therefore in electricity supplying and using system in addition to needing active power supply, it is also necessary to which reactive power source, both lack one
Can not.
But if many negative impacts can be produced to power grid in power grid there is during substantial amounts of reactive power.Such as line
The loss on road and equipment adds, and system voltage stability is seriously affected, and line drop accordingly increases, power factor
It is lowered by, the utilization rate which results in place capacity is reduced.Therefore, reactive power compensator comes into being.At present, compared with
For it is advanced be advanced static reactive generator (ASVG), it has the performance that continuously adjusts and adjustable range is very big, response
Speed and its it is fast, control accuracy is very high, can safe and stable operation, connection reactance it is small and many excellent with static operation etc.
Point.
The real-time of ASVG of the prior art is not high, this is because the asynchronous sampling of ASVG of the prior art and lead
Cause.Because the frequency of power grid is constantly present certain change, if obtained when being acquired to power network signal it is N number of at equal intervals
Sample point is equably fallen in a complete cycle ripple of power grid, will result in measurement error.In view of this, it is necessory to provide
A kind of detection circuit of real-time static reactive generator.
Utility model content
The utility model provides a kind of detection dress of static reactive generator for the above technological deficiency of the prior art
Put, producing the interference of certain lagging influence and null offset to voltage jump in itself to solve the sensor of detection circuit asks
Topic, improves the real-time of static reactive generator.
The purpose of this utility model is achieved through the following technical solutions：
A kind of detection device of static reactive generator, for providing signal to A/D converter 5, it is characterised in that including
Voltage transformer 1, current transformer 2, zero-crossing comparator 3, PLL synchronous sampling circuit circuit 4 and voltage zero-crossing detection circuit 6,
The voltage transformer 1, voltage zero-crossing detection circuit 6 and A/D converter 5 are sequentially connected；The current transformer 2 and shown institute
A/D converter 5 is stated to connect；The zero-crossing comparator 3, PLL synchronous sampling circuit circuit 4 and A/D converter 5 are sequentially connected.
Preferably, the adjustment end of the voltage transformer 1 and output terminal and connect the first capacitance C1 and first resistor R1 to
Compensating phase shift.
Preferably, the voltage zero-crossing detection circuit 6 includes 601 and first operational amplifier 602 of divider resistance, described point
601 and first operational amplifier 602 of piezoresistance connects.
Preferably, the divider resistance 601 is also associated with potentiometer 603 and diode 604, the potentiometer 603 and two
Pole pipe 604 connects.
Preferably, the PLL synchronous sampling circuit circuit 4 includes the 9th resistance R9, the photoelectrical coupler being sequentially connected electrically
U1, the tenth resistance R10, the second operational amplifier U2A and inverting amplifier U3A；The base stage of the triode Q connects power supply, current collection
Pole is connected with the tenth resistance R10, and emitter is grounded by the 11st resistance R11；The tenth resistance R10 and described second
The negative input connection of operational amplifier U2A, the electrode input end of the second operational amplifier U2A pass through the 12nd resistance
R12 is grounded；The second operational amplifier U2A is also parallel with the 13rd resistance R13.
Preferably, Signal-regulated kinase 7 is further included, the output terminal of the current transformer 2 and the voltage transformer 1
Output terminal is connected by Signal-regulated kinase 7 with the input terminal of the A/D converter 5.
Preferably, the Signal-regulated kinase 7 is current mode over-sampling modulate circuit.
Preferably, the voltage transformer uses TVS1908-02 voltage transformers.
Compared with prior art, the detection device of the utility model static reactive generator at least has below beneficial to effect
Fruit：
Voltage zero-crossing detection circuit, the sensor for solving detection circuit produce certain lagging influence and null offset in itself
To the interference problem of voltage jump.Using PLL synchronous sampling circuit circuit, sample rate can be efficiently controlled and determined with what is sampled
When, so as to ensure that the synchronism of sampling, the error caused by asynchronous sampling is inherently eliminated, improves static reacance hair
The real-time of raw device.
Brief description of the drawings
Fig. 1 is the structure diagram of the detection device of the utility model static reactive generator；
Fig. 2 be the utility model static reactive generator detection device in voltage zero-crossing detection circuit circuit theory
Figure；
Fig. 3 is former for the circuit of PLL synchronous sampling circuit circuit in the detection device of the utility model static reactive generator
Reason figure.
Embodiment
The utility model is described in further detail with reference to the accompanying drawings and examples, following embodiments be it is descriptive,
It is not limited, it is impossible to which the scope of protection of the utility model is limited with this.
Make the purpose, technical scheme and advantage of the utility model embodiment clearer, below in conjunction with the utility model
Attached drawing in embodiment, the technical scheme in the utility model embodiment is clearly and completely described, it is clear that described
Embodiment be the utility model part of the embodiment, instead of all the embodiments.Described in usual attached drawing here and show
The component of the utility model embodiment gone out can be arranged and designed with a variety of configurations.Therefore, below in attached drawing
The detailed description of the embodiment of the utility model of middle offer is not intended to limit claimed the scope of the utility model, and
It is the selected embodiment for being merely representative of the utility model.Based on the embodiment in the utility model, those of ordinary skill in the art
All other embodiments obtained without creative efforts, shall fall within the protection scope of the present invention.
The embodiment of the utility model is described below in detail, the example of the embodiment is shown in the drawings, wherein from beginning
Same or similar element is represented to same or similar label eventually or there is same or like element.Below by ginseng
The embodiment for examining attached drawing description is exemplary, it is intended to for explaining the utility model, and it is not intended that to the utility model
Limitation.
The detection device of the utility model static reactive generator is further described with reference to Figure of description.Such as figure
Shown in 1, be static reactive generator detection device structure diagram, the detection device of static reactive generator, for
A/D converter 5 provides signal, including voltage transformer 1, current transformer 2, zero-crossing comparator 3, PLL synchronous sampling circuit circuit
4th, voltage zero-crossing detection circuit 6 and Signal-regulated kinase 7, the voltage transformer 1, voltage zero-crossing detection circuit 6 and A/D conversions
Device 5 is sequentially connected, and the current transformer 2 is connected with the shown A/D converter 5, and the zero-crossing comparator 3, phaselocked loop are same
Step sample circuit 4 and A/D converter 5 are sequentially connected.Wherein：
The adjustment end and output terminal of (with reference to figure 2) described voltage transformer 1 simultaneously connect the first capacitance C1 and first resistor R1 use
With compensating phase shift.Voltage sensor N1 selects the active AC voltage mutual inductors of TVS1908-02, inside voltage transformer N1
Isolating transformer by the adjustment decompression of the phase voltage to be detected of input be secondary side voltage, when input terminal voltage signal is in OV~volume
When changing between constant voltage, the voltage signal of OV~5V is exported between secondary side voltage pin 8, pin 10.The ground connection of pin 8 ensures
The precision of measurement.The adjustment end (pin 7) and output terminal (pin 10) of voltage transformer N1 simultaneously meet the first capacitance C1 and first
Resistance R1 is to compensating phase shift.
The voltage zero-crossing detection circuit 6 includes 601 and first operational amplifier 602 of divider resistance, the divider resistance
601 and first operational amplifier 602 connect.The divider resistance 601 is also associated with potentiometer 603 and diode 604, the electricity
Position device 603 and diode 604 connect.Divider resistance 601 includes second resistance R2 and 3rd resistor R3, and secondary side voltage is through second
Exported after resistance R2 and 3rd resistor R3 partial pressures to the inverting input of the first operational amplifier 602, divider resistance is string at this time
The resistance R2 and resistance R3 of connection, the inverting input of the first operational amplifier 602 passes through the 4th resistance R4 and 3.3V bases after partial pressure
Quasi- source connection, the normal phase input end of the first operational amplifier 602 are connected by the 5th resistance R5 with 3.3V a reference sources, the first computing
The normal phase input end of amplifier 602 is grounded by the 7th resistance R7, and the normal phase input end of the first operational amplifier 602 also passes through phase
Series connection the 8th resistance R8 and the 9th resistance R9 access 3.3V a reference sources, the first operational amplifier 602 by normal phase input end with
The voltage of inverting input is than exporting voltage synchronous zero cross signal to be detected.Due to sensor, there may be certain hysteresis shadow in itself
Ring and drift has voltage jump certain interference, when inverting input increases a potentiometer 603 to voltage jump
Quarter is changed, it is ensured that the square wave trailing edge of generation corresponds to the zero crossing of A phase voltages.Specifically in second resistance R2 and the 4th
The output contact of potentiometer 603 is connected between resistance R4, other both ends of potentiometer 603 connect power source voltage Vcc and connect respectively
The anode of diode 604 is also connected between ground voltage Vss, two series connection second resistance R2 and 3rd resistor R3, diode 604 is just
Pole is grounded.When output of the input signal of inverting input of the first operational amplifier 602 from voltage sensor N1, this
Output signal corresponds to A phase voltages, and when the inverting input input of the first operational amplifier 602 is higher than 0V, the first computing is put
Big device 602 exports 0V, otherwise output is high level 3.3V.
The input terminal of current transformer 2 is connected with power grid, and output end signal conditioning module 7 connects, Signal-regulated kinase 7 with
The input terminal connection of A/D converter 5.The input terminal of voltage transformer 1 is connected with other circuits, and output terminal is detected with voltage zero-cross
Circuit 6 connects, and voltage zero-crossing detection circuit 6 is connected with Signal-regulated kinase 7, and Signal-regulated kinase 7 is connected with A/D converter 5.
The Signal-regulated kinase 7 is current mode over-sampling modulate circuit.The input terminal connection power grid of zero-crossing comparator 4, output terminal and lock
The input terminal connection of phase ring synchronized sampling circuit 4, and the output terminal of PLL synchronous sampling circuit circuit 4 and A/D converter 5 is defeated
Enter end connection.The effect of current transformer 2 is high current being converted into low current in proportion, measurement easy to secondary meter,
Used for protective device, in addition, it also acts as the effect of electrical isolation.The effect of voltage transformer 1 be high voltage by than
Example relation transformation is into 100V or the standard secondary voltage of more inferior grade, and for protecting, measuring, metering device uses, meanwhile, use electricity
Pressure mutual inductor 1 can also isolate high voltage with electrician.Exported due to current transformer 2 and voltage transformer 1
It is less electric current and voltage change, therefore, is nursed one's health before digital signal is transformed to and (amplify, buffer or calibrate
Analog signal etc.) so as to fit in the input of A/D conversion circuits 5.
As shown in figure 3, the circuit diagram for PLL synchronous sampling circuit circuit.PLL synchronous sampling circuit circuit 4 include according to
The 9th resistance R9, photoelectrical coupler U1, the tenth resistance R10, the second operational amplifier U2A and the inverting amplifier of secondary electrical connection
U3A.Photoelectrical coupler U1 includes triode Q and light emitting diode D；The base stage of triode Q connects power supply, collector and the tenth resistance
R10 connections, emitter are grounded by the 11st resistance R11.The anode of tenth resistance R10 and the second operational amplifier U2A input
End connection, the electrode input end of the second operational amplifier U2A are grounded by the 12nd electricity R12；Second operational amplifier U2A is also simultaneously
It is associated with the 13rd resistance R13.PLL synchronous sampling circuit circuit 4 ensures the synchronism of sampling, so as to improve static reactive generator
Real-time.
Preferably, the PLL synchronous sampling circuit circuit 4 include be sequentially connected electrically the 9th resistance R9, light emitting diode D,
Triode Q, the tenth resistance R10, the second operational amplifier U2A and inverting amplifier U3A；The base stage of the triode Q connects power supply,
Collector is connected with the tenth resistance R10, and emitter is grounded by the 11st resistance R11；The tenth resistance R10 with it is described
The negative input connection of second operational amplifier U2A, the electrode input end of the second operational amplifier U2A pass through the 12nd
Resistance R12 is grounded；The second operational amplifier U2A is also parallel with the 13rd resistance R13.
More than, it is only the preferable embodiment of the utility model, but the protection domain of utility model is not limited to
This, any one skilled in the art is in the technical scope that the utility model discloses, the change that can readily occur in
Or replace, it should be covered within the scope of the utility model.Therefore, the scope of protection of the utility model should be with right
Subject to the protection domain of claim.
Claims (8)
1. a kind of detection device of static reactive generator, for providing signal to analog A/D converter (5), its feature exists
In, including voltage transformer (1), current transformer (2), zero-crossing comparator (3), PLL synchronous sampling circuit circuit (4) and voltage
Zero cross detection circuit (6), the voltage transformer (1), voltage zero-crossing detection circuit (6) and A/D converter (5) are sequentially connected；
The current transformer (2) is connected with the shown A/D converter (5)；The zero-crossing comparator (3), PLL synchronous sampling circuit
Circuit (4) and A/D converter (5) are sequentially connected.
2. the detection device of static reactive generator according to claim 1, it is characterised in that the voltage transformer
(1) adjustment end and output terminal simultaneously meet the first capacitance C1 and first resistor R1 to compensating phase shift.
3. the detection device of static reactive generator according to claim 1, it is characterised in that the voltage zero-cross detection
Circuit (6) includes divider resistance (601) and the first operational amplifier (602), the divider resistance (601) and the first operation amplifier
Device (602) connects.
4. the detection device of static reactive generator according to claim 3, it is characterised in that the divider resistance
(601) potentiometer (603) and diode (604), the potentiometer (603) and diode (604) connection are also associated with.
5. the detection device of static reactive generator according to claim 1, it is characterised in that the Phase Locked Loop Synchronization is adopted
Sample circuit (4) includes the 9th resistance R9, photoelectrical coupler U1, the tenth resistance R10, the second operational amplifier being sequentially connected electrically
U2A and inverting amplifier U3A；The base stage of triode Q connects power supply, and collector is connected with the tenth resistance R10, and emitter passes through
11st resistance R11 is grounded；The tenth resistance R10 is connected with the negative input of the second operational amplifier U2A, described
The electrode input end of second operational amplifier U2A is grounded by the 12nd resistance R12；The second operational amplifier U2A is also simultaneously
It is associated with the 13rd resistance R13.
6. the detection device of static reactive generator according to claim 1, it is characterised in that further include signal condition mould
Block (7), the output terminal of the current transformer (2) and the output terminal of the voltage transformer (1) pass through Signal-regulated kinase
(7) input terminal with the A/D converter (5) is connected.
7. the detection device of static reactive generator according to claim 1, it is characterised in that the Signal-regulated kinase
(7) it is current mode over-sampling modulate circuit.
8. the detection device of static reactive generator according to claim 1, it is characterised in that the voltage transformer is adopted
With TVS1908-02 voltage transformers.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720812471.1U CN207263838U (en) | 2017-07-06 | 2017-07-06 | A kind of detection device of static reactive generator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720812471.1U CN207263838U (en) | 2017-07-06 | 2017-07-06 | A kind of detection device of static reactive generator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207263838U true CN207263838U (en) | 2018-04-20 |
Family
ID=61926591
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720812471.1U Expired - Fee Related CN207263838U (en) | 2017-07-06 | 2017-07-06 | A kind of detection device of static reactive generator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207263838U (en) |
-
2017
- 2017-07-06 CN CN201720812471.1U patent/CN207263838U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180420 Termination date: 20190706 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |