CN208736953U - A kind of voltage dip generator and voltage dip pilot system - Google Patents
A kind of voltage dip generator and voltage dip pilot system Download PDFInfo
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- CN208736953U CN208736953U CN201821499029.9U CN201821499029U CN208736953U CN 208736953 U CN208736953 U CN 208736953U CN 201821499029 U CN201821499029 U CN 201821499029U CN 208736953 U CN208736953 U CN 208736953U
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Abstract
The embodiment of the present application discloses a kind of voltage dip generator, comprising: source side converter, intergrade converter and load-side inverter；The DC output end of source side converter is connect with the input terminal of intergrade converter, and the output end of intergrade converter and the direct-flow input end of load-side inverter connect；Source side converter forms electrical isolation by intergrade converter and load-side inverter.When technical solution provided by the present application solves progress voltage dip test, once the technical issues of power network fluctuation caused by ground short circuit occurs and causes field test personnel electric shock risk increase.The embodiment of the present application also discloses a kind of voltage dip pilot system.
Description
Technical field
This application involves electrical engineering technical field more particularly to a kind of voltage dip generator and voltage dip test systems
System.
Background technique
With the development of economy and society, harm and bring economic loss caused by voltage dip and short interruptions at
The power quality problem paid close attention to the most for power supply company and user.Voltage dip is that certain point power-frequency voltage root-mean-square value reduces suddenly
To the 10%-90% of voltage rating, and it is of short duration continue 10ms~1min after restore normal phenomenon.Such as variable speed drives are filled
For setting the voltage sensitive equipments such as (ASD), program logic controller (PLC), computer system, voltage dip can be such that equipment stops
Work, serious voltage dip can also make equipment damage.
When studying influence of the voltage dip to electrical equipment, it is necessary first to which a job of progress is to different electricity consumptions
The test of equipment progress voltage dip tolerance.In general, the tolerance of electrical equipment can be tested by voltage dip test
Ability.In voltage dip test, can with the voltage dip of simulating grid, to the response phenomenon of the Devices to test during this into
Row analysis, so that the voltage dip tolerance of device under test is assessed.
However when carrying out voltage dip test, Devices to test is in abnormal operating state, and at any time may be due to
Tolerance incessantly damages, and in this case, the risk that ground short circuit failure occurs for test side can greatly increase, once it connects
Ground short circuit, the power supply grid as experiment power supply will appear very big fluctuation, or even influence the normal work of entire power grid；This
Outside, if testing crew has accidentally touched electric part at this time, it is easy to happen electric shock accidents, the electric shock risk of testing crew is big
It is big to increase.
Utility model content
The embodiment of the present application provides a kind of voltage dip generator and voltage dip pilot system, solves carry out voltage
When temporarily drop test, test side will cause power supply grid to fluctuate and cause field test personnel to get an electric shock once ground short circuit occurs
The technical issues of risk increases.
In view of this, the application first aspect provides a kind of voltage dip generator, comprising: source side converter, in
Intercaste converter and load-side inverter；
The DC output end of the source side converter is connect with the input terminal of the intergrade converter, the intergrade
The output end of converter is connect with the direct-flow input end of the load-side inverter；
The source side converter forms electrical isolation by the intergrade converter and the load-side inverter.
Preferably, the intergrade converter specifically includes: the first dual H-bridge circuit, isolating transformer and the second dual H-bridge
Circuit；
The dual H-bridge output end of the first dual H-bridge circuit is connect with the primary side of the isolating transformer, and the isolation becomes
The secondary side of depressor is connect with the dual H-bridge input terminal of the second dual H-bridge circuit.
Preferably, the isolating transformer is specially high frequency transformer.
Preferably, the source side converter and the load-side inverter are specially three-level voltage source converter, institute
It states source side converter and the load-side inverter and back-to-back connection is formed by the intergrade converter.
The application second aspect provides a kind of voltage dip pilot system, the system include: Devices to test connection position with
And any voltage dip generator that above-mentioned first aspect provides；
The exchange input side of the voltage dip generator is used to connect with power supply grid, the voltage dip generator
Exchange outlet side is connect with the input terminal of the Devices to test connection position, the outlet terminal of the Devices to test connection position
For being connect with Devices to test.
Preferably, it is connected with first switch between the voltage dip generator and the Devices to test connection position, it is described
Second switch is connected between Devices to test connection position and the Devices to test.
Preferably, further includes: programmable load；
The Devices to test is specially the programmable load.
Preferably, the Devices to test connection position further includes voltage tester terminal and testing current terminal.
Preferably, further includes: oscillograph；
The oscillograph is used to connect by the voltage tester terminal with testing current terminal with the Devices to test.
Preferably, the Devices to test connection position further include: transparent shield, for covering the Devices to test to be formed
Isolation.
As can be seen from the above technical solutions, the embodiment of the present application has the advantage that
In the embodiment of the present application, a kind of voltage dip generator is provided comprising source side converter, intergrade transformation
Device and load-side inverter.Wherein, source side converter is formed by intergrade converter and load-side inverter and is connected, and
And source side converter also passes through intergrade converter and load-side inverter forms electrical isolation.
When voltage dip generator provided by the embodiments of the present application is tested for voltage dip, even if during the test
Have occurred ground short circuit failure, but due to grid side is realized at voltage dip generator and test between side it is electrical every
From short trouble is isolated in test side, will not affect to grid side, ensure that the stability of power grid.
On the other hand, the electric part that electrical isolation makes testing crew only touch grid side can just get an electric shock, and
It will not get an electric shock when touching the electric part of test side, thus greatly reduce the electric shock risk of testing crew.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of one embodiment of voltage dip generator provided by the present application；
Fig. 2 is the single-phase circuit figure of second embodiment of voltage dip generator provided by the present application；
Fig. 3 is a kind of structural schematic diagram of one embodiment of voltage dip pilot system provided by the present application.
Specific embodiment
In order to make those skilled in the art more fully understand application scheme, below in conjunction in the embodiment of the present application
Attached drawing, the technical scheme in the embodiment of the application is clearly and completely described, it is clear that described embodiment is only this
Apply for a part of the embodiment, instead of all the embodiments.Based on the embodiment in the application, those of ordinary skill in the art exist
Every other embodiment obtained under the premise of creative work is not made, shall fall in the protection scope of this application.
This application provides a kind of voltage dip generators, by source side converter and load-side inverter setting
Intercaste converter, so that realizing electrical isolation between source side converter and load-side inverter.
Below referring to Figure 1, Fig. 1 is the structural representation of one embodiment of voltage dip generator provided by the present application
Figure, which includes: source side converter 11, intergrade converter 12 and load-side inverter 13.
There are many implementations of voltage dip generator, for example, voltage dip can be realized using automatic coupling voltage regulator, but
Automatic coupling voltage regulator can only two voltage dip characteristic quantities of the temporary drawdown degree of analog voltage and duration, can not accurate simulation voltage it is temporary
Phase hit and starting point in drop；There are also a kind of " back-to-back " connections being preferably achieved in that through converter.
By the voltage dip generator of " back-to-back " connection type, the two-way flow of ability may be implemented, it both can be with
Realize that energy, can also be from " Devices to test → power supply grid " from " power supply grid → Devices to test ".In most cases, energy is
Devices to test is flowed to from power grid, but if Devices to test is the load that electric machinery has energy feedback characteristic, energy may also
Power supply grid is flowed to from Devices to test.It should be noted that unless otherwise indicated, content that the application records should all with energy from
Power supply grid is understood based on flowing to Devices to test.
In the present embodiment, the DC output end of source side converter 11 can connect with the input terminal of intergrade converter 12
It connects, the output end of intergrade converter 12 can be connect with the direct-flow input end of load-side inverter 13.It should be noted that electric
The AC rectification of power supply grid can be direct current by source converter 11, therefore it is with ac input end and DC output end,
Wherein, DC output end is connect with intergrade converter 12.And direct current again inversion can be exchange by load-side inverter 13,
With direct-flow input end and ac output end.
Intergrade converter 12 is also real in addition to realizing the connection between source side converter 11 and load-side inverter 13
Electrical isolation between the two is showed, i.e. source side converter 11 can be with load-side inverter 13 by intergrade converter 12
Form electrical isolation.
It is the detailed description of one embodiment of voltage dip generator provided by the present application above, when the embodiment mentions
When the voltage dip generator of confession is tested for voltage dip, even if during the test, ground short circuit event has occurred in test side
Barrier, but due to realizing grid side at voltage dip generator and testing the electrical isolation between side, short trouble is limited
In test side, therefore grid side will not be affected, ensure that the stability of power grid；On the other hand, electrical isolation to try
Testing personnel and only touching the electric part of grid side can just get an electric shock, and will not touch when touching the electric part of test side
Electricity thus greatly reduces the electric shock risk of testing crew.
Fig. 2 is referred to below, and Fig. 2 is the single-phase circuit of second embodiment of voltage dip generator provided by the present application
Figure.
Intergrade converter 12 realizes the electrical isolation between source side converter 11 and load-side inverter 13, realizes
There are many modes of electric power isolation, for example the electrical isolation of two lateral circuits can be realized by optocoupler components, can also lead to
Isolating transformer 22 is crossed to realize electrical isolation.
In the present embodiment, intergrade converter 12 mainly includes two dual H-bridge circuits and isolating transformer 22, wherein
Two dual H-bridge circuits are respectively the first dual H-bridge circuit 21 and the second dual H-bridge circuit 23.Isolating transformer 22 may be implemented to exchange
Between electrical isolation, but due to after source side converter 11 power supply grid provide alternating current be rectified for direct current
Electricity, therefore the first dual H-bridge circuit 21 can be set, it is exchange by direct current again inversion.
Specifically, the first dual H-bridge circuit 21 can be single-phase full bridge topological structure, it can choose a variety of full-controlled switch devices
Part, preferably one is IGBT.The dual H-bridge output end of first dual H-bridge circuit 21 can connect with the primary side of isolating transformer 22
It connects.
Since voltage dip generator is mainly that the cooperation of source side converter 11 and load-side inverter 13 is relied on to convert
Realize the output of voltage dip waveform, and the input terminal of load-side inverter 13 is direct-flow input end, therefore isolating transformer 22
The exchange of secondary side needs to be rectified into direct current again with input load side converter 13.
Specifically, the secondary side of isolating transformer 22 can be connect with the dual H-bridge input terminal of the second dual H-bridge circuit 23,
In, the second dual H-bridge circuit 23 and the first dual H-bridge circuit 21 can be identical circuit, pass through isolation between two dual H-bridge circuits
Transformer 22 forms " back-to-back " connection.The exchange warp for by the second dual H-bridge circuit 22 secondary side of isolating transformer being exported
It crosses and rectifies back direct current again.
It should be noted that effect of the isolating transformer 22 in addition to realizing electrical isolation, it is also possible that voltage dip can
Adjust range bigger, specifically, can be by adjusting the no-load voltage ratio of isolating transformer 22.The no-load voltage ratio of isolating transformer 22 is not necessarily intended to set
It is set to 1:1, can according to need and be adjusted, so that the DC voltage output and input is different, for example, can pass through change
Than adjustment so that the DC voltage of input intergrade converter 12 is 500V, the DC voltage of output is 200V.
Further, heavy since 22 volume of isolating transformer is big, in order to reduce the volume of device, isolating transformer 22
It is specifically as follows high frequency transformer.
Source side converter 11 is the converter that can be direct current, and load-side inverter by the AC rectification of power supply grid
13 be the converter that can be exchange by direct current again inversion.There are many converters that rectification or inversion can be implemented separately, but
For the two-way flow of energy between better analog power and load, the converter of selection is preferably provided simultaneously with rectification and inversion
The reversible transducer of function.
There are many implementation of reversible transducer is same, for example source side converter 11 and load-side inverter 13 can be with
The positive reversed inversion of rectification may be implemented by reasonably controlling the switching tube in full-bridge circuit for full-bridge circuit.It should be understood that
, it is not the restriction to direction that above-mentioned forward direction, which is also possible to reversely, reversely be also possible to forward direction,.
Full-bridge circuit is a kind of implementation, one of more excellent there are also the implementation of other reversible transducers
Being achieved in that for choosing can be using three-level voltage source converter, for convenience, referred to as tri-level circuit.Tri-level circuit
It is difunctional with inversion that rectification equally may be implemented, compare full-bridge circuit, have the advantages that more.
The single-phase bridge arm of full-bridge circuit is made of two IGBT pipes, and the single-phase bridge arm of tri-level circuit is managed by four IGBT
Composition, therefore the voltage stress that switching tube is born reduces one times, is conducive to extend the service life of switch tube device, also, three electricity
Ordinary telegram road reduces the resistance to pressure request of switch tube device, therefore the switch scope tube that can be selected is wider.On the other hand, full-bridge electricity
Road can only export two level, and tri-level circuit can export three level, keep the harmonic wave of output waveform less, and waveform quality is more
Height, it is more excellent in output characteristics, it is more suitable for high-voltage large-capacity application.
In the present embodiment, source side converter 11 and load-side inverter 13 can be set as three-level voltage source change
Parallel operation, two three-level voltage source converters realize back-to-back connection by intergrade converter 12.It is understood that due to
Three-level voltage source converter is the converter of two-way flow comprising DC side with exchange side, for source side converter 11
For, the exchange side of three-level voltage source converter is input terminal, and DC side is output end, and for load-side inverter 13,
Exchange side is output end, and DC side is input terminal.
It should be noted that input terminal described in this application and output end are all based on the direction of power supply flow direction load
Input and output, certainly, if load be active load, in some cases, load may reverse power supply to power supply, at this time
Input and output it is exactly the opposite.
The above are the detailed descriptions of second embodiment of voltage dip generator provided by the present application.In the present embodiment,
Source side converter 11 and load-side inverter 13 are disposed as three-level voltage source converter, two three-level voltage source transformation
Device realizes back-to-back connection by intergrade converter 12.And intergrade converter 12 is set as the first dual H-bridge of H-bridge inverter circuit
The combination of circuit 21, high frequency transformer and the second dual H-bridge circuit 23 also increases electricity while realizing electrical isolation
The adjustable extent of pressure temporarily drop simulation.
When carrying out voltage dip test, even if ground short circuit failure has occurred during the test, but due in voltage
Grid side temporarily is realized at the intergrade converter 12 of drop generator and tests the electrical isolation between side, and short trouble just will not
Power supply grid is affected, ensure that the stability of power grid；Also, in ground short circuit failure, testing crew is only touched
Electric part to test side can just get an electric shock, and the electric part for touching grid side will not then get an electric shock, and thus greatly reduce test
The electric shock risk of personnel.
Fig. 3 is referred to below, and Fig. 3 is a kind of structure of one embodiment of voltage dip pilot system provided by the present application
Schematic diagram, the system include: any voltage dip provided in Devices to test connecting tooling and the above embodiments of the present application
Generator.
When carrying out voltage dip test, the exchange input side of voltage dip generator 32 can connect with power supply grid 31
It connects, true electricity consumption situation is simulated using power grid as experiment power supply.The exchange outlet side of voltage dip generator 32 can be with
The input terminal of Devices to test connection position 34 connects, and the outlet terminal of Devices to test connection position 34 can connect with Devices to test
It connects, to form the voltage dip pilot system of a completion.It should be noted that Devices to test is what voltage dip was tested
Subjects.
It, can be in voltage dip generator 32 in order to the safer wiring exited test or change pilot system
First switch 33 is set between Devices to test connection position 34, is arranged second between Devices to test connection position 34 and Devices to test
Switch 35.
Further, system provided in this embodiment can also include programmable load 36.Programmable load 36 is a kind of
Dummy load can simulate a variety of exchanges and DC load.When for AC load simulation, constant current, fixed electricity can be simulated
Power, RLC, surge current isotype are determined in resistance；When for DC load simulation, analog constant current determines resistance, determines power, is fixed
Voltage, rectification isotype.
When using load of the programmable load 36 as Devices to test institute band, programmable load 36 is connect with Devices to test
At organic whole, can be connect by second switch 35 with Devices to test connection position 34.Certainly, if needing to true electricity consumption
Load is tested, then can disconnect second switch 35, programmable load 36 is exited pilot system, with true power load generation
It is tested for programmable load 36.
Devices to test connection position 34 is the tooling of mating voltage dip test setting, provides voltage dip test needs
The various Wiring ports and test wire used, such as above-mentioned input terminal and outlet terminal, may be implemented power supply grid
Connection between 31 and Devices to test.Certainly, Devices to test connection position 34 can also include other connecting terminals, for example voltage is surveyed
Try terminal and testing current terminal.
Voltage tester terminal can be attached with testing current terminal with other test equipments, and various test equipments are equal
The voltage and current data of Devices to test can be collected by the voltage tester terminal and testing current terminal.Specific test
There are many equipment, can be voltage collector or current collector, is also possible to power tester etc..And in the present embodiment
In, which can be set to oscillograph 37, oscillograph 37 can by voltage tester terminal and testing current terminal with
Devices to test connection, it is convenient that the waveform of its electric current and/or voltage is recorded and analyzed.
Devices to test connection position 34 additionally provides a transparent shield, the transparent shield can cover be placed on it is to be measured
The Devices to test on station that equipment connection position 34 provides, is formed certain isolation effect by way of physics, prevents scene
Testing crew electric shock.Due to having chosen transparent material, also facilitate the response phenomenon of real time inspection Devices to test.
The above are a kind of detailed description of the embodiment of voltage dip pilot system provided by the present application, the pilot system is big
Body is sent out by any voltage dip provided in Devices to test connection position 34, programmable load 36 and the above embodiments of the present application
Raw device 32 is constituted.Wherein, Devices to test connection position 34 provides various Wiring ports and test wire, for voltage dip test
Wiring provides a great convenience.And programmable load 36 can simulate the power load of different characteristics, being equivalent to can
It is tested with the voltage dip tolerance to different electrical equipments.
When stating system progress voltage dip test in use, even if ground short circuit failure has occurred during the test,
But due to realizing grid side at the voltage dip generator 32 in pilot system and testing the electrical isolation between side, short circuit
Failure will not affect power supply grid 31, ensure that the stability of power grid；On the other hand, electrical isolation makes testing crew
The electric part for only touching grid side can just get an electric shock, and will not get an electric shock when touching the electric part of test side, thus
Greatly reduce the electric shock risk of testing crew.
The description of the present application and term " first " in above-mentioned attached drawing, " second ", " third ", " the 4th " etc. are (if deposited
) it is to be used to distinguish similar objects, without being used to describe a particular order or precedence order.It should be understood that use in this way
Data are interchangeable under appropriate circumstances, so that embodiments herein described herein for example can be in addition to illustrating herein
Or the sequence other than those of description is implemented.In addition, term " includes " and " having " and their any deformation, it is intended that
Cover it is non-exclusive include, for example, containing the process, method, system, product or equipment of a series of steps or units need not limit
In step or unit those of is clearly listed, but may include be not clearly listed or for these process, methods, produce
The other step or units of product or equipment inherently.
It should be appreciated that in this application, " at least one (item) " refers to one or more, and " multiple " refer to two or two
More than a."and/or" indicates may exist three kinds of relationships, for example, " A and/or B " for describing the incidence relation of affiliated partner
It can indicate: only exist A, only exist B and exist simultaneously tri- kinds of situations of A and B, wherein A, B can be odd number or plural number.Word
Symbol "/" typicallys represent the relationship that forward-backward correlation object is a kind of "or"." at least one of following (a) " or its similar expression, refers to
Any combination in these, any combination including individual event (a) or complex item (a).At least one of for example, in a, b or c
(a) can indicate: a, b, c, " a and b ", " a and c ", " b and c ", or " a and b and c ", and wherein a, b, c can be individually, can also
To be multiple.
The above, above embodiments are only to illustrate the technical solution of the application, rather than its limitations；Although referring to before
Embodiment is stated the application is described in detail, those skilled in the art should understand that: it still can be to preceding
Technical solution documented by each embodiment is stated to modify or equivalent replacement of some of the technical features；And these
It modifies or replaces, the spirit and scope of each embodiment technical solution of the application that it does not separate the essence of the corresponding technical solution.
Claims (10)
1. a kind of voltage dip generator characterized by comprising source side converter, intergrade converter and load-side
Converter；
The DC output end of the source side converter is connect with the input terminal of the intergrade converter, the intergrade transformation
The output end of device is connect with the direct-flow input end of the load-side inverter；
The source side converter forms electrical isolation by the intergrade converter and the load-side inverter.
2. voltage dip generator according to claim 1, which is characterized in that the intergrade converter specifically includes:
First dual H-bridge circuit, isolating transformer and the second dual H-bridge circuit；
The dual H-bridge output end of the first dual H-bridge circuit is connect with the primary side of the isolating transformer, the isolating transformer
Secondary side connect with the dual H-bridge input terminal of the second dual H-bridge circuit.
3. voltage dip generator according to claim 2, which is characterized in that the isolating transformer is specially that high frequency becomes
Depressor.
4. voltage dip generator according to claim 1, which is characterized in that the source side converter and the load
Side converter is specially three-level voltage source converter, and the source side converter and the load-side inverter pass through in described
Intercaste converter forms back-to-back connection.
5. a kind of voltage dip pilot system characterized by comprising Devices to test connection position and such as Claims 1-4 times
Voltage dip generator described in one；
The exchange input side of the voltage dip generator with power supply grid for connecting, the exchange of the voltage dip generator
Outlet side is connect with the input terminal of the Devices to test connection position, and the outlet terminal of the Devices to test connection position is used for
It is connect with Devices to test.
6. system according to claim 5, which is characterized in that the voltage dip generator is connect with the Devices to test
It is connected with first switch between position, is connected with second switch between the Devices to test connection position and the Devices to test.
7. system according to claim 6, which is characterized in that further include: programmable load；
The programmable load with the outlet terminal of the Devices to test connection position for connecting.
8. system according to claim 5, which is characterized in that the Devices to test connection position further includes voltage tester terminal
With testing current terminal.
9. system according to claim 8, which is characterized in that further include: oscillograph；
The oscillograph is used to connect by the voltage tester terminal with testing current terminal with the Devices to test.
10. system according to claim 5, which is characterized in that the Devices to test connection position further include: transparent protection
Cover, for covering the Devices to test to form isolating and protecting.
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| CN201821499029.9U CN208736953U (en) | 2018-09-13 | 2018-09-13 | A kind of voltage dip generator and voltage dip pilot system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108919016A (en) * | 2018-09-13 | 2018-11-30 | 广东电网有限责任公司 | A kind of voltage dip generator and voltage dip pilot system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108919016A (en) * | 2018-09-13 | 2018-11-30 | 广东电网有限责任公司 | A kind of voltage dip generator and voltage dip pilot system |
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