CN205863903U - A kind of output current measurement for chain-type inverter and protection device - Google Patents
A kind of output current measurement for chain-type inverter and protection device Download PDFInfo
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- CN205863903U CN205863903U CN201620786629.8U CN201620786629U CN205863903U CN 205863903 U CN205863903 U CN 205863903U CN 201620786629 U CN201620786629 U CN 201620786629U CN 205863903 U CN205863903 U CN 205863903U
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- 238000005259 measurement Methods 0.000 title claims abstract description 23
- 238000004891 communication Methods 0.000 claims abstract description 28
- 238000006243 chemical reaction Methods 0.000 claims abstract description 15
- 239000013307 optical fiber Substances 0.000 claims abstract description 9
- 230000001105 regulatory effect Effects 0.000 claims description 16
- 238000002955 isolation Methods 0.000 claims description 11
- 230000001012 protector Effects 0.000 claims description 9
- 238000005070 sampling Methods 0.000 abstract description 6
- 230000005540 biological transmission Effects 0.000 abstract description 4
- 230000008859 change Effects 0.000 description 3
- 230000005611 electricity Effects 0.000 description 3
- 230000006872 improvement Effects 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 230000003287 optical effect Effects 0.000 description 1
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Abstract
The utility model discloses a kind of output current measurement for chain-type inverter and protection device; including current sensor, A/D conversion and overcurrent protection module, fpga chip, communication module and power module; current sensor is installed on by arbitrary chain link module of tested chain-type inverter; and an ac output end line of chain link module is directly through the former limit measured hole of current sensor; the secondary outfan of current sensor is changed by A/D and overcurrent protection module is connected with fpga chip, and fpga chip is connected with communication module.This utility model current sensor primary and secondary side is not subjected to high voltage, solves the pressure problem of sensor；The electric current measured by serial communication transmission and overcurrent protection data is carried out by fpga chip sampled output current and overcurrent protection signal and by optical fiber; sampling at a high speed and overcurrent protection can be realized; meet the needs of real-time feedback control output electric current, thus efficiently solve quickly measuring and protection problem of high-voltage chain type inverter output electric current.
Description
Technical field
This utility model relates to electric automatization equipment, is specifically related to a kind of output current measurement for chain-type inverter
With protection device.
Background technology
Chain-type inverter is also referred to as H bridge series connection inverter, and this inverter (or is claimed the single-phase H bridge change of current by multiple chain link modules
Device module) exchange output be in series, can be widely used in various converter plant, such as high voltage variable frequency speed regulator, novel static
Synchronous compensator (STATCOM), generation of electricity by new energy inverter, dynamic electric voltage recovery device (DVR), active filter (APF) etc..
Owing to chain-type inverter is usually used in exporting the application scenario (3kV-35kV) of higher alternating voltage so that its output
Current measurement and output current protection become difficulty.When using Hall current sensor to measure its output electric current, by Hall current
The restriction that the insulation of sensor former secondary is pressure, it is impossible to directly measure the output electricity of the chain-type inverter of high voltage application scenario
Stream.And use high-tension current inductor to cause measuring high expensive, and the direct current cannot measured in inverter output electric current divides
Amount, impacts control performance.Additionally, this output electric current may need to be used for feedback control, sampling rate may need up to
50us mono-point.It is, thus, sought for a kind of new measurement and output current protective device.
Utility model content
The technical problems to be solved in the utility model: provide a kind of and be capable of the measurement to output electric current and protection, electricity
The primary and secondary side of flow sensor need not to bear high voltage, the pressure problem solving sensor, sampled by fpga chip defeated
Go out electric current and overcurrent protection signal and carry out the electric current measured by serial communication transmission and overcurrent protection data by optical fiber, permissible
Realize sampling at a high speed and overcurrent protection, meet the needs of real-time feedback control output electric current, it is possible to height can be efficiently solved
The quickly measurement of pressure output current of chain-type inverter and the output current measurement for chain-type inverter of protection problem and protection
Device.
In order to solve above-mentioned technical problem, the technical solution adopted in the utility model is:
A kind of output current measurement for chain-type inverter and protection device, including current sensor, A/D conversion and mistake
Stream protection module, fpga chip, communication module and power module, described current sensor is installed on appointing of tested chain-type inverter
By one chain link module, and an ac output end line of described chain link module is directly through the former limit measurement of current sensor
Hole, the secondary outfan of described current sensor is changed by A/D and overcurrent protection module is connected with fpga chip, described FPGA
Chip is connected with communication module, and described power module is changed and overcurrent protection module, fpga chip, communication module with A/D respectively
It is connected.
Preferably, described current sensor is current transformer or Hall current sensor.
Preferably, described A/D conversion and overcurrent protection module include A/D converter and overcurrent protector, and described electric current passes
The outfan of sensor is connected with overcurrent protector with A/D converter respectively, and the digital signal output end of described A/D converter,
The overcurrent protection signal output part of overcurrent protector is connected with fpga chip respectively.
Preferably, described communication module is optical fibre driver.
Preferably, described power module includes isolating regulated power supply and insulating power supply transformator, described insulating power supply transformation
The former limit of device is connected with external ac power source, secondary is connected with isolation regulated power supply, and described isolation regulated power supply turns with A/D respectively
Change and overcurrent protection module, fpga chip, communication module be connected.
With protection device, this utility model has an advantage that this practicality is new for the output current measurement of chain-type inverter
Type includes current sensor, A/D conversion and overcurrent protection module, fpga chip, communication module and power module, and described electric current passes
Sensor is installed on by arbitrary chain link module of tested chain-type inverter, and an ac output end line of described chain link module is straight
Connecing the former limit measured hole through current sensor, the secondary outfan of described current sensor is changed by A/D and overcurrent protection
Module is connected with fpga chip, therefore, it is possible to realize the measurement to output electric current and protection, the primary and secondary side of current sensor
Need not to bear high voltage, solve the pressure problem of sensor, and by fpga chip sampled output current and cross stream and protect
Protect signal and carry out the electric current measured by serial communication transmission and overcurrent protection data by optical fiber, it is possible to achieve sampling at a high speed
And overcurrent protection, meet the needs of real-time feedback control output electric current, it is possible to high-voltage chain type inverter can be efficiently solved defeated
Go out quickly measuring and protection problem of electric current.
Accompanying drawing explanation
Fig. 1 is the structural representation of this utility model embodiment one.
Fig. 2 is the structural representation of this utility model embodiment two.
Marginal data: 1, current sensor；2, A/D conversion and overcurrent protection module；3, fpga chip；4, communication module；
5, power module；51, isolation regulated power supply；52, insulating power supply transformator.
Detailed description of the invention
Embodiment one:
As it is shown in figure 1, the present embodiment includes current sense for the output current measurement of chain-type inverter with protection device
Device 1, A/D conversion and overcurrent protection module 2, fpga chip 3, communication module 4 and power module 5, current sensor 1 be installed on by
Survey by arbitrary chain link module of chain-type inverter, and an ac output end line of chain link module is directly through current sensor
The former limit measured hole of 1, the secondary outfan of current sensor 1 is changed by A/D and overcurrent protection module 2 and fpga chip 3 phase
Even, fpga chip 3 is connected with communication module 4, power module 5 changes with A/D respectively and overcurrent protection module 2, fpga chip 3,
Communication module 4 is connected.Pass through said structure so that the present embodiment is used for output current measurement and the protection device of chain-type inverter
Current sensor 1 primary and secondary side need not bear high voltage, solve the pressure problem of current sensor 1；Pass through FPGA
Chip 3 sampled output current and overcurrent protection signal also carry out the electric current measured by serial communication transmission by optical fiber and cross stream and protect
Protect data, it is achieved sampling at a high speed and overcurrent protection, meet the needs of real-time feedback control output electric current.
Current sensor 1 is for measuring the output electric current of chain-type inverter.In the present embodiment, current sensor 1 is Hall
Current sensor, sees Fig. 1, and wherein V+, V-are respectively the both positive and negative polarity connection terminal of power supply, and IO is detection signal output part
Son.Current sensor 1 is for measuring the output electric current of chain-type inverter, and it is installed on arbitrary chain link module of chain-type inverter
Side, an ac output end line of this chain link module is directly through the former limit measured hole of described current sensor 1, above-mentioned
The secondary output signal of current sensor 1 is connected to A/D conversion and overcurrent protection module 2.
In the present embodiment, A/D conversion and overcurrent protection module 2 include A/D converter and overcurrent protector, current sensor
The outfan of 1 is connected with overcurrent protector with A/D converter respectively, and the digital signal output end of A/D converter, overcurrent protection
The overcurrent protection signal output part of device is connected with fpga chip 3 respectively.A/D converter receives the control letter of fpga chip 3 output
Number, and current measurement signal is converted into digital signal exports to fpga chip 3；Overcurrent protector compare current measurement signal with
Overcurrent protection sets signal output overcurrent protection signal to above-mentioned fpga chip 3.In the present embodiment, A/D converter is concrete
Using the A/D converter part that model is AD7656 that AD company produces, overcurrent protection implement body uses the model that TI company produces
Over-current protection device for LM293.
Fpga chip 3 is for by from A/D conversion and the current measurement digital signal of overcurrent protection module 2 and overcurrent protection
Signal carries out encoding and be converted into serial communication data signal, is exported by communication module 4, and be capable of up to 50uS with
In high-speed sampling with communicate.In the present embodiment, fpga chip 3 specifically uses the XC3E100E-of the production of XILINX company
The device of 4TQG144I.
In the present embodiment, communication module 4 is optical fibre driver, for the serial communication data letter exported by fpga chip 3
Number being converted into optical signal is sent in optical fiber.In the present embodiment, optical fibre driver specifically use TI company SN55452 and
The HFBR1521Z of AVAGO company.
In the present embodiment, power module 5 includes isolating regulated power supply 51 and insulating power supply transformator 52, insulating power supply transformation
The former limit of device 52 is connected with external ac power source, secondary is connected with isolation regulated power supply 51, isolation regulated power supply 51 respectively with A/D
Conversion and overcurrent protection module 2, fpga chip 3, communication module 4 are connected.Isolation regulated power supply 51 is for changing for A/D and crossing stream
Protection module 2, fpga chip 3, communication module 4 provide regulated power supply；Insulating power supply transformator 52 is for providing for regulated power supply
The electrical isolation that high insulation is pressure and low office puts, the input (DC+/DC-) of isolation regulated power supply 51 is from insulating power supply transformator
The secondary of 52, isolation regulated power supply 51 is output as A/D conversion and overcurrent protection module 2, fpga chip 3, communication module 4 provide
Regulated power supply.The former limit of insulating power supply transformator 52 exports from the exchange that do not has a power failure of mains ac power supply or UPS alternating current power supply,
It needs have the performance indications that high pressure and low office of insulating puts.
Embodiment two:
As in figure 2 it is shown, the present embodiment is essentially identical with embodiment one, its main difference is: in the present embodiment, and electric current passes
Sensor 1 is current transformer, and two outputs of current transformer connect terminal and change and two of overcurrent protection module 2 with A/D
Input terminal is connected.
The above is only preferred implementation of the present utility model, and protection domain of the present utility model is not limited merely to
Above-described embodiment, all technical schemes belonged under this utility model thinking belong to protection domain of the present utility model.Should refer to
Go out, for those skilled in the art, without departing from the some improvement under this utility model principle premise and
Retouching, these improvements and modifications also should be regarded as protection domain of the present utility model.
Claims (5)
1. the output current measurement for chain-type inverter and protection device, it is characterised in that: include current sensor
(1), A/D conversion and overcurrent protection module (2), fpga chip (3), communication module (4) and power module (5), described electric current biography
Sensor (1) is installed on by arbitrary chain link module of tested chain-type inverter, and an ac output end of described chain link module is even
Line is changed by A/D directly through the former limit measured hole of current sensor (1), the secondary outfan of described current sensor (1)
And overcurrent protection module (2) is connected with fpga chip (3), described fpga chip (3) is connected with communication module (4), described power supply
Module (5) is connected with A/D conversion and overcurrent protection module (2), fpga chip (3), communication module (4) respectively.
Output current measurement for chain-type inverter the most according to claim 1 and protection device, it is characterised in that: institute
Stating current sensor (1) is current transformer or Hall current sensor.
Output current measurement for chain-type inverter the most according to claim 1 and protection device, it is characterised in that: institute
State A/D conversion and overcurrent protection module (2) includes A/D converter and overcurrent protector, the outfan of described current sensor (1)
It is connected with overcurrent protector with A/D converter respectively, and the digital signal output end of described A/D converter, overcurrent protector
Overcurrent protection signal output part is connected with fpga chip (3) respectively.
Output current measurement for chain-type inverter the most according to claim 1 and protection device, it is characterised in that: institute
Stating communication module (4) is optical fibre driver.
Output current measurement for chain-type inverter the most according to claim 1 and protection device, it is characterised in that: institute
State power module (5) to include isolating regulated power supply (51) and insulating power supply transformator (52), described insulating power supply transformator (52)
Former limit be connected with external ac power source, secondary is connected with isolation regulated power supply (51), described isolation regulated power supply (51) is respectively
It is connected with A/D conversion and overcurrent protection module (2), fpga chip (3), communication module (4).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201620786629.8U CN205863903U (en) | 2016-07-25 | 2016-07-25 | A kind of output current measurement for chain-type inverter and protection device |
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| CN201620786629.8U CN205863903U (en) | 2016-07-25 | 2016-07-25 | A kind of output current measurement for chain-type inverter and protection device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106207977A (en) * | 2016-07-25 | 2016-12-07 | 国网湖南省电力公司 | A kind of output current measurement for chain-type inverter and protection device |
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- 2016-07-25 CN CN201620786629.8U patent/CN205863903U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106207977A (en) * | 2016-07-25 | 2016-12-07 | 国网湖南省电力公司 | A kind of output current measurement for chain-type inverter and protection device |
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