CN207320835U - A kind of breaking circuit for voltage compensating device - Google Patents
A kind of breaking circuit for voltage compensating device Download PDFInfo
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- CN207320835U CN207320835U CN201721150319.8U CN201721150319U CN207320835U CN 207320835 U CN207320835 U CN 207320835U CN 201721150319 U CN201721150319 U CN 201721150319U CN 207320835 U CN207320835 U CN 207320835U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
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Abstract
The utility model provides a kind of breaking circuit for voltage compensating device, which includes：Single-phase transformer T, single-phase rectification bridge RE, the first DC support capacitance C1, the second DC support capacitance C2, the first thyristor SCR21, the second thyristor SCR22；The primary side of single-phase transformer T is connected with system power supply, and for the alternating current of reception system power supply output, secondary is connected with the exchange side of single-phase rectification bridge RE；First DC support capacitance C1 and the second DC support capacitance C2 are connected in series the composition first branch, first thyristor SCR21 and the second thyristor SCR22 series aiding connections connect and compose the second branch, and the first branch is in parallel with the DC side and the second branch of single-phase rectification bridge RE；The midpoint of the second branch is connected with one end of bidirectional thyristor SCR1, and the other end of bidirectional thyristor SCR1 and the midpoint of the output terminal of system power supply and the first branch connect.The utility model can be reliably by the shut-off of the thyristor in voltage compensating device.
Description
Technical field
It the utility model is related to technical field of electric power, more particularly to a kind of breaking circuit for voltage compensating device.
Background technology
The main method for solving voltage dip at present is in user side protection device for installing, such as uninterrupted power source (UPS), is moved
State voltage restorer (DVR) and dynamic sag correction device (DYSC).UPS may be used also due to can not only solve Problem of Voltage Temporary-Drop
It is used widely with solving voltage long-time disruption, but with the popularization of the main power supply mode in China double loop, electricity
Net voltage long-time disruption almost no longer occurs, and simultaneously because UPS losses are big, of high cost and battery service works
Measure the problems such as big and be that many enterprises cause the problem of new.Although DVR is obtained extensively as the mainstream scheme for administering voltage dip
Using, but since its operation principle is overlapped in series scheme, when power grid reclosing causes not working when system is breaking.
Although DYSC solves main problem existing for DVR, but cause expensive not pushing away due to the use of single-phase full bridge topological structure
Extensively.
Therefore developing low-cost, the low-loss and voltage dip controlling device for possessing the ability of rapidly switching off has important meaning
Justice, and the key technology rapidly switched off is then thyristor breaking circuit.
Utility model content
In order to solve the above technical problems, the utility model provides a kind of breaking circuit for voltage compensating device, can be with
The shut-off for the thyristor being reliably achieved in voltage compensating device.
A kind of breaking circuit for voltage compensating device provided by the utility model, including：It is single-phase transformer T, single-phase
Rectifier bridge RE, the first DC support capacitance C1, the second DC support capacitance C2, the first thyristor SCR21, the second thyristor
SCR22；
The single-phase transformer T, its primary side are connected with system power supply, for receiving the exchange of the system power supply output
Electricity, secondary are connected with the exchange side of the single-phase rectification bridge RE；
The first DC support capacitance C1 and the second DC support capacitance C2 are connected in series the composition first branch, institute
State the first thyristor SCR21 and the second thyristor SCR22 series aiding connections connect and compose the second branch, the first branch with
The DC side of the single-phase rectification bridge RE and the second branch are in parallel；
The midpoint of the second branch is connected with one end of bidirectional thyristor SCR1, and the bidirectional thyristor SCR1's is another
End is connected with the output terminal of the system power supply and the midpoint of the first branch.
Preferably, the system power supply is the three-phase system power supply of output three-phase alternating current.
Preferably, thyristor control circuit is further included；
The thyristor control circuit, with the first thyristor SCR21, the second thyristor SCR22, described two-way
Thyristor SCR1 connections, for exporting electric signal to the first thyristor SCR21, the second thyristor SCR22, described double
To thyristor SCR1, to control the first thyristor SCR21, the second thyristor SCR22, the bidirectional thyristor SCR1
Conducting.
Preferably, the single-phase rectification bridge RE includes two bridge arms in parallel, each bridge arm is connected in series including two
Diode, and both ends of the midpoint of two bridge arms respectively with the secondary of the single-phase transformer T are connected.
Preferably, exchange side of the midpoint of the second branch also with load and three-phase bridge inverter is connected；
The three-phase bridge inverter, its exchange side are connected by the bidirectional thyristor SCR1 with the system power supply, directly
Stream side is connected with energy-storage travelling wave tube, for by the bidirectional thyristor SCR1, receiving the alternating current from the system power supply, and
Alternating current progress rectification is obtained into direct current, and direct current is delivered to the energy-storage travelling wave tube, is additionally operable to receive direct current, and will
Direct current carries out inversion and obtains alternating current, and by the exchange electricity output that inversion obtains to the load；
The energy-storage travelling wave tube, charges for receiving direct current, is additionally operable to output direct current to the three-phase bridge inversion
Device.
Preferably, the three-phase bridge inverter includes current source mode and voltage source mode, and the three-phase bridge inverter
When being operated in current source mode, it receives the alternating current from the system power supply, and the three-phase bridge inverter is operated in voltage
During source module, it controls the energy-storage units output direct current.
Preferably, the three-phase bridge inverter is three phase full bridge topological structure or three-phase half-bridge topology.
Preferably, current-limiting resistance R, current-limiting reactor L are further included；
The one end and institute of the midpoint of the second branch by the current-limiting reactor L and bidirectional thyristor SCR1
State the exchange side connection of three-phase bridge inverter；
One end of the first branch is connected by one end of the current-limiting resistance R and the DC side of the single-phase rectification bridge RE
Connect.
Preferably, the single-phase transformer T is step-up transformer.
Preferably, the boosting coefficient range of the single-phase transformer is 1:3~1:5.
Implement the utility model, have the advantages that：, can be with triggering and conducting when voltage dip occurs in system power supply
The voltage of first thyristor SCR21, the first DC support capacitance C1 is applied to bidirectional thyristor SCR1 as back-pressure, and control is two-way
Thyristor SCR1 upper tube SCR11 shut-off, can with the second thyristor of triggering and conducting SCR22, the second DC support capacitance C2's
Voltage is applied to bidirectional thyristor SCR1 as back-pressure, and the down tube SCR12 shut-offs of control bidirectional thyristor SCR1, add two-way
The reliability of thyristor SCR1 shut-offs.
Brief description of the drawings
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, drawings in the following description are only
It is some embodiments of the utility model, for those of ordinary skill in the art, in the premise not made the creative labor
Under, other attached drawings can also be obtained according to these attached drawings.
Fig. 1 is the circuit diagram of the breaking circuit provided by the utility model for voltage compensating device.
Fig. 2 is that the afterflow provided by the utility model for denoting bidirectional thyristor SCR1 in the circuit diagram shown in figure 1 is led to
The schematic diagram in road.
Embodiment
The utility model provides a kind of breaking circuit for voltage compensating device, as shown in Figure 1, the breaking circuit bag
Include：Single-phase transformer T, single-phase rectification bridge RE, the first DC support capacitance C1, the second DC support capacitance C2, the first thyristor
SCR21, the second thyristor SCR22.Wherein, the first thyristor SCR21 and the second thyristor SCR22 can be unidirectional brilliant lock
Pipe.
The primary side of single-phase transformer T is connected with system power supply, for the alternating current of reception system power supply output, single-phase transformation
The secondary of device T is connected with the exchange side of single-phase rectification bridge RE.
First DC support capacitance C1 and the second DC support capacitance C2 are connected in series the composition first branch, the first thyristor
SCR21 and the second thyristor SCR22 series aiding connections connect and compose the second branch, the first branch and the DC side of single-phase rectification bridge RE
And the second branch is in parallel.
The midpoint of the second branch is connected with one end of bidirectional thyristor SCR1, the other end and system of bidirectional thyristor SCR1
The output terminal of power supply and the midpoint connection of the first branch.
Wherein, connection of the midpoint of the first branch between the first DC support capacitance C1 and the second DC support capacitance C2
Point, the tie point of the midpoint of the second branch between the first thyristor SCR21 and the second thyristor SCR22.
Further, system power supply is the three-phase system power supply of output three-phase alternating current.
Further, the breaking circuit for voltage compensating device further includes thyristor control circuit (not shown).
Thyristor control circuit is connected with the first thyristor SCR21, the second thyristor SCR22, bidirectional thyristor SCR1, is used
In output electric signal to the first thyristor SCR21, the second thyristor SCR22, bidirectional thyristor SCR1, to control the first thyristor
SCR21, the second thyristor SCR22, bidirectional thyristor SCR1 conductings.
Further, single-phase rectification bridge RE includes two bridge arms in parallel, what each bridge arm was connected in series including two
Diode, and both ends of the midpoint of two bridge arms respectively with the secondary of single-phase transformer T are connected.
Further, exchange side of the midpoint of the second branch also with load and three-phase bridge inverter is connected.
The exchange side of three-phase bridge inverter is connected by bidirectional thyristor SCR1 with system power supply, DC side and energy-storage travelling wave tube
Connection, for by bidirectional thyristor SCR1, receiving the alternating current from system power supply, and alternating current progress rectification is obtained directly
Galvanic electricity, and direct current is delivered to energy-storage travelling wave tube, it is additionally operable to receive direct current, and direct current progress inversion is obtained into alternating current,
And by the exchange electricity output that inversion obtains to load.Here, load can be the power equipment for consuming electric energy.
Energy-storage travelling wave tube charges for receiving direct current, is additionally operable to output direct current to three-phase bridge inverter.
Further, three-phase bridge inverter includes current source mode and voltage source mode, and three-phase bridge inverter is operated in
During current source mode, it receives the alternating current from system power supply, and when three-phase bridge inverter is operated in voltage source mode, it is controlled
Energy-storage units export direct current.
Further, three-phase bridge inverter is three phase full bridge topological structure or three-phase half-bridge topology.
Further, the breaking circuit for voltage compensating device further includes current-limiting resistance R, current-limiting reactor L.
The midpoint of the second branch passes through one end of current-limiting reactor L and bidirectional thyristor SCR1 and three-phase bridge inverter
Exchange side connects, wherein, one end of current-limiting reactor L and the midpoint of the second branch connect, and the other end is connected to bidirectional thyristor
Between the exchange side of SCR1 and three-phase bridge inverter.One end of the first branch is straight by current-limiting resistance R and single-phase rectification bridge RE's
Flow one end connection of side.
Further, single-phase transformer T is step-up transformer.
Further, the boosting coefficient range of single-phase transformer is 1:3~1:5.Here boosting coefficient refers to single-phase change
The ratio of depressor original edge voltage and secondary voltage.
Bidirectional thyristor SCR1 can be equivalent to two unidirectional thyristor reverse parallel connections, and one of unidirectional thyristor is upper
Pipe SCR11, another unidirectional thyristor are down tube SCR12.When system power supply works normally, the upper tube of bidirectional thyristor SCR1
SCR11 and down tube SCR12 is triggered conducting, and the first thyristor SCR21 and the second thyristor SCR22 are not triggered and lead
Logical, three-phase bridge inverter is operated in current source mode.
First DC support capacitance C1 and the second DC support capacitance C2 are filled by single-phase transformer T and single-phase rectification bridge RE
Electricity.Once system power supply occur voltage dip, and if bidirectional thyristor SCR1 upper tube SCR11 it is in the conduction state when, at the same time
The first thyristor SCR21 in breaking circuit (that is to say thyristor back-pressure breaking circuit) is turned on, to turn off bidirectional thyristor
The upper tube SCR11 of SCR1, afterwards three-phase bridge inverter switch to voltage source mode for load power.If breaking circuit needs to close
The upper tube SCR11 of disconnected bidirectional thyristor SCR1 in the conduction state, the then brilliant lock of first in triggering and conducting back-pressure breaking circuit
Pipe SCR21, at this time the voltage of the first DC support capacitance C1 upper tube SCR11, therefore upper tube SCR11 meetings can be applied to as back-pressure
It is turned off within 0.2ms.If breaking circuit needs to turn off the down tube of bidirectional thyristor SCR1 in the conduction state
SCR12, then the second thyristor SCR22 in triggering and conducting breaking circuit, at this time the voltage of the second DC support capacitance C2 can make
Down tube SCR12 is applied to for back-pressure, therefore down tube SCR12 can be turned off within 0.2ms.
In order to give bidirectional thyristor SCR1 provide afterflow passage, the first DC support capacitance C1, the first thyristor SCR21 and
Current-limiting reactor L constitutes new current loop as afterflow passage, as shown in dashed line in figure 2, due to the first DC support
Capacitance C1 voltages are higher than the voltage of system power supply, after the first thyristor SCR21 is triggered conducting, flow through bidirectional thyristor SCR1
The electric current of upper tube SCR11 can be transferred to new current loop, as long as ensureing that the first DC support capacitance C1 velocities of discharge need
The turn-off time for being greater than the upper tube SCR11 of bidirectional thyristor SCR1 requires 0.2ms, can realize the reliable pass of upper tube SCR11
It is disconnected；Similarly, as long as ensureing that the second DC support capacitance C2 velocities of discharge need the down tube SCR12's more than bidirectional thyristor SCR1
Turn-off time requires 0.2ms, can realize the reliable turn-off of down tube SCR12.
In conclusion, there is electricity in system power supply in the breaking circuit provided by the utility model for voltage compensating device
When pressure temporarily drops, the first thyristor SCR21, the second thyristor SCR22, the first DC support capacitance C1, the second direct current can be passed through
Support Capacitor C2, to control the shut-off of bidirectional thyristor SCR1, adds the reliability of bidirectional thyristor SCR1 shut-offs.
By application thyristor technology, LC resonance technology and inverter afterflow Path Setup technology, it is fast to realize thyristor
Speed shut-off, and the reliability of thyristor shut-off is added, also achieve the compensation of three-phase bridge contravarianter voltage and the nothing of system power supply
Stitch handoff functionality, it can be ensured that the normal work of voltage-sensitive load, the circuit loss is low, and cost is low, extends voltage dip
Treatment process field, and there is the response speed being exceedingly fast, standby efficient, working stability, and also it is simple in structure, effectively save
About product cost, easily operated easy to safeguard, sexual valence is higher.
Thyristor provided by the utility model, which rapidly switches off circuit, can realize the inverter parallel side of voltage compensating device
Case, inverter parallel technology can be used not only for voltage compensation and can be also used for the power qualities such as reactive-load compensation and active power filtering controlling
Reason.
Above content is to combine specific preferred embodiment further detailed description of the utility model, it is impossible to
Assert that the specific implementation of the utility model is confined to these explanations.For the ordinary skill of the utility model technical field
For personnel, without departing from the concept of the premise utility, some simple deduction or replace can also be made, should all be regarded
To belong to the scope of protection of the utility model.
Claims (10)
- A kind of 1. breaking circuit for voltage compensating device, it is characterised in that including：Single-phase transformer T, single-phase rectification bridge RE, the first DC support capacitance C1, the second DC support capacitance C2, the first thyristor SCR21, the second thyristor SCR22；The single-phase transformer T, its primary side are connected with system power supply, secondary for receiving the alternating current of the system power supply output Side is connected with the exchange side of the single-phase rectification bridge RE；The first DC support capacitance C1 and the second DC support capacitance C2 is connected in series the composition first branch, and described One thyristor SCR21 and the second thyristor SCR22 series aiding connections connect and compose the second branch, the first branch with it is described The DC side of single-phase rectification bridge RE and the second branch are in parallel；The midpoint of the second branch is connected with one end of bidirectional thyristor SCR1, the other end of the bidirectional thyristor SCR1 with The midpoint of the output terminal of the system power supply and the first branch connects.
- 2. the breaking circuit according to claim 1 for voltage compensating device, it is characterised in that the system power supply is Export the three-phase system power supply of three-phase alternating current.
- 3. the breaking circuit according to claim 1 for voltage compensating device, it is characterised in that further include thyristor control Circuit processed；The thyristor control circuit, with the first thyristor SCR21, the second thyristor SCR22, the two-way brilliant lock Pipe SCR1 connections, for exporting electric signal to the first thyristor SCR21, the second thyristor SCR22, the two-way crystalline substance Brake tube SCR1, to control the first thyristor SCR21, the second thyristor SCR22, the bidirectional thyristor SCR1 to lead It is logical.
- 4. the breaking circuit according to claim 1 for voltage compensating device, it is characterised in that the single-phase rectification bridge RE includes two bridge arms in parallel, each bridge arm includes two diodes being connected in series, and the midpoint difference of two bridge arms It is connected with the both ends of the secondary of the single-phase transformer T.
- 5. the breaking circuit according to claim 2 for voltage compensating device, it is characterised in that the second branch Exchange side of the midpoint also with load and three-phase bridge inverter is connected；The three-phase bridge inverter, its exchange side are connected by the bidirectional thyristor SCR1 with the system power supply, DC side It is connected with energy-storage travelling wave tube, for by the bidirectional thyristor SCR1, receiving the alternating current from the system power supply, and will hand over Galvanic electricity carries out rectification and obtains direct current, and direct current is delivered to the energy-storage travelling wave tube, is additionally operable to receive direct current, and by direct current Electricity carries out inversion and obtains alternating current, and by the exchange electricity output that inversion obtains to the load；The energy-storage travelling wave tube, charges for receiving direct current, is additionally operable to output direct current to the three-phase bridge inverter.
- 6. the breaking circuit according to claim 5 for voltage compensating device, it is characterised in that the three-phase bridge inversion Device includes current source mode and voltage source mode, and when the three-phase bridge inverter is operated in current source mode, its reception comes from The alternating current of the system power supply, when the three-phase bridge inverter is operated in voltage source mode, it controls the energy-storage units defeated Go out direct current.
- 7. the breaking circuit according to claim 5 for voltage compensating device, it is characterised in that the three-phase bridge inversion Device is three phase full bridge topological structure or three-phase half-bridge topology.
- 8. the breaking circuit according to claim 5 for voltage compensating device, it is characterised in that further include current-limiting resistance R, current-limiting reactor L；One end and described three that the midpoint of the second branch passes through the current-limiting reactor L and bidirectional thyristor SCR1 The exchange side connection of phase bridge inverter；One end of the first branch is connected by the current-limiting resistance R with one end of the DC side of the single-phase rectification bridge RE.
- 9. the breaking circuit according to claim 1 for voltage compensating device, it is characterised in that the single-phase transformer T is step-up transformer.
- 10. the breaking circuit according to claim 9 for voltage compensating device, it is characterised in that the single-phase transformation The boosting coefficient range of device is 1:3~1:5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721150319.8U CN207320835U (en) | 2017-09-08 | 2017-09-08 | A kind of breaking circuit for voltage compensating device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721150319.8U CN207320835U (en) | 2017-09-08 | 2017-09-08 | A kind of breaking circuit for voltage compensating device |
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| Publication Number | Publication Date |
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| CN207320835U true CN207320835U (en) | 2018-05-04 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107465196A (en) * | 2017-09-08 | 2017-12-12 | 深圳供电局有限公司 | A kind of breaking circuit for voltage compensating device |
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2017
- 2017-09-08 CN CN201721150319.8U patent/CN207320835U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107465196A (en) * | 2017-09-08 | 2017-12-12 | 深圳供电局有限公司 | A kind of breaking circuit for voltage compensating device |
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