CN205986160U - Dynamic voltage restorer with short -circuit current restricts function - Google Patents
Dynamic voltage restorer with short -circuit current restricts function Download PDFInfo
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- CN205986160U CN205986160U CN201620934400.4U CN201620934400U CN205986160U CN 205986160 U CN205986160 U CN 205986160U CN 201620934400 U CN201620934400 U CN 201620934400U CN 205986160 U CN205986160 U CN 205986160U
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- recovery device
- current
- electric voltage
- dynamic electric
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Abstract
The utility model provides a dynamic voltage restorer with short -circuit current restricts function, it is including the energy supply circuit, direct current electric capacity, dc -to -ac converter, filter circuit, coupling transformer and the the bypass switch that connect gradually, direct current electric capacity both ends are equipped with parallelly connected current -limiting branch road. The utility model provides a dynamic voltage restorer has traditional functions such as clamping voltage falls temporarily, improved electric energy quality, simultaneously, can take place the short -circuit current impact that short -circuit fault causes by effective suppression device low reaches load, can prevent that dynamic voltage restorer and other equipment from damaging because of overflowing, alleviates PCC end voltage dip, has more extensive suitability.
Description
Technical field
This utility model is related to a kind of dynamic electric voltage recovery device and in particular to a kind of have the dynamic of short circuit current limitation function
State voltage restorer.
Background technology
With the increasingly raising of industrial automatization, user is also more and more sensitive to power quality problem, wherein voltage
Temporarily fall has become the outstanding problem of impact electric load safe operation.Meanwhile, continuous with the new forms of energy constant power undulatory property energy
Application, the input of the such as novel energy such as photovoltaic, wind-powered electricity generation continues to increase, and the optimization of the quality of power supply is greatly challenged.By electricity
Dynamic electric voltage recovery device (the Dynamic of the compositions such as potential source type inverter (VSC), output filter circuit, direct current energy supply circuit
Voltage Restorer, DVR) be that a kind of series-type voltage compensates equipment, there is the ability of output controllable voltage, when DVR with
Power supply reliability and prescription very high power system series connection when, its output offset voltage will be according to point of common coupling
Voltage pulsation that (PCC-Point of CommonCoupling) holds and adjust, thus ensureing the voltage stabilization of sensitive load.But
DVR there is also problem in itself, and that is, the load side of series connection with it is short-circuited.Develop rapidly with modern power systems, electromotor
Capacity, substation capacity, city and center of industry load density and distributed power source quantity continue to increase, short in electrical networks at different levels
Road electric current is also continuously increased.When the sensitive load being connected with DVR is short-circuited, huge short circuit current not only can to DVR originally
Body and other power equipments impact, and cause device damage, and can lead to this branch road PCC point that voltage dip occurs, and threaten
Power grid security.
Utility model content
For solving the above problems, this utility model provides a kind of dynamic electric voltage with short circuit current limitation function to recover
Device, quickly can be switched to short circuit current restriction state from voltage compensation state when sensitive load is short-circuited, suppression is short
The impact to system and dynamic electric voltage recovery device for the road electric current, alleviates point of common coupling voltage dip, improves security of system.
For achieving the above object, the technical scheme that this utility model is adopted is as follows：
A kind of dynamic electric voltage recovery device with short circuit current limitation function, described dynamic electric voltage recovery device includes connecting successively
Energy supply circuit, DC capacitor, inverter, filter circuit, coupling transformer and the by-pass switch connecing；Described DC capacitor two ends are divided
It is not provided with current limliting branch road in parallel.
Described current limliting branch road includes current-limiting resistance and current-limiting inductance or reactor is in series current limiting device and switching tube.
Described switching tube is all-controlling power electronics device or mechanical switch.
The topological structure of described inverter is three-phase three-wire system half-bridge structure, three-phase four-wire system half-bridge structure, three-phase four bridge
Arm configuration or respectively mutually independent H bridge construction.
The topological structure of described energy supply circuit is not control type rectification circuit, full-control type rectification circuit or be connected with energy-storage battery
DC/DC circuit.
Described by-pass switch is in parallel with the outfan of described coupling transformer.
The outfan of described coupling transformer is connected with point of common coupling and sensitive load respectively.
Compared with immediate prior art, the technical scheme that this utility model provides has the advantages that：
1st, the dynamic electric voltage recovery device increase electrical equipment that this utility model provides is few, reduces cost, has saved and installed additional
The great number that fault current limiter brings puts into.
2nd, the dynamic electric voltage recovery device that this utility model provides increased pattern switching and current limliting branch road controls, method letter
Single, easily realization.
3rd, the dynamic electric voltage recovery device that this utility model provides suppresses voltage dip, improves the traditional functions such as the quality of power supply,
Meanwhile, the effectively restraining device downstream load fault that is short-circuited can cause short-circuit current rush, prevent dynamic electric voltage recovery device and
Other equipment is damaged because of excessively stream, alleviates PCC terminal voltage and temporarily drops, has the wider suitability.
Brief description
Fig. 1 is the circuit diagram of this utility model dynamic electric voltage recovery device.
Specific embodiment
Below in conjunction with the accompanying drawings specific embodiment of the present utility model is described in further detail.
This utility model provides a kind of dynamic electric voltage recovery device (Dynamic with short circuit current limitation function
Voltage Restorer, DVR), while retaining conventional DVR compensation sensitive load voltage dip function, increase current limliting and prop up
Road, so as to quickly short circuit current restriction state can be switched to from voltage compensation state when sensitive load is short-circuited, presses down
The impact to system and DVR for the short circuit current processed, alleviates PCC point voltage and temporarily drops, improve security of system
Specific implementation is as follows：
1st, physical topology
According to Fig. 1, the current limliting branch circuit parallel connection in technical solutions of the utility model at DVR DC bus capacitor two ends, its
Including current-limiting inductance L and current-limiting resistance R, and access is controlled by switching tube K.When DVR is in voltage compensation mode, current limliting is propped up
Way switch pipe K disconnects, and DVR modulates output offset voltage by full-controlled device, is as good as with conventional func DVR；When DVR detect with
After the sensitive load of its series connection is short-circuited, switching tube K turns on rapidly, and DVR convertor unit full-controlled device is all off, fault electricity
The anti-paralleled diode flowing through full-controlled device enters DC capacitor branch road and current limliting branch road, current-limiting inductance and current-limiting resistance with parallel
DC capacitor constitute antiresonant circuit together, this circuit resistance value is high, can effectively suppress short circuit current.
It can be three-phase three-wire system half-bridge structure, three-phase four-wire system half-bridge that this utility model provides the inverter topology of DVR
Structure, three-phase four-arm structure and respectively mutually independent H bridge construction etc.；The energy supply circuit topology of DVR can be uncontrollable rectifier circuit,
All controlled rectifier circuit or the DC/DC circuit being connected with energy-storage battery.
2nd, DVR job control flow process
DVR job control flow process is divided into normal work, fault to put into, failure removal and device put into four states again：
(1) normal work：When DVR normally runs, collection voltages and electric current simultaneously generate inverter reference according to backoff algorithm
Output voltage waveforms, modulated after send switch command to full-controlled device, control inverter to work in voltage compensation state.DVR
DC capacitor voltage can be maintained by the adjunct circuit energy supply such as shunt rectifier circuit or energy-storage units, also can be by the control of inverter itself
System strategy maintains.The switching tube K of DC side parallel current limliting branch road is off, and current limliting branch road is stayed to main inverter and energy supply
Circuit does not produce any impact.
(2) fault puts into：When control unit detect sensitive load be short-circuited fault when, send immediately order turn off straight
Stream electric capacity energy supply circuit switch K2, trigger switch pipe K conducting simultaneously puts into current limliting branch road and stops triggering full-controlled device.
(3) failure removal：After fault branch breaker actuation, DVR by-pass switch K1 closes, and device temporarily exits.DVR
After DC capacitor voltage is reduced to below given threshold V1, control system sends order and disconnects current limliting branch switch pipe K in parallel, electricity
Appearance energy is substantially released and is finished.
(4) device puts into again：When short trouble is thoroughly removed, when system sends DVR and puts into order again, DVR DC side supplies
DC capacitor can be charged circuit；After DC capacitor voltage reaches more than given threshold V2, control system sends order and disconnects
DVR by-pass switch K1, device puts into, and control system instructions export offset voltage with (1), DVR according to system command.
It is to be understood that, this utility model content and specific embodiment are intended to prove the provided technology of this utility model
The practical application of scheme, should not be construed as the restriction to this utility model protection domain.Those skilled in the art are new in this practicality
Under the spirit of type and principle inspire, can various modifications may be made, equivalent or improve.But these changes or modification are all treated in application
In the protection domain criticized.
Claims (7)
1. a kind of dynamic electric voltage recovery device with short circuit current limitation function it is characterised in that：Described dynamic electric voltage recovery device
Including the energy supply circuit being sequentially connected, DC capacitor, inverter, filter circuit, coupling transformer and by-pass switch；Described direct current
Electric capacity is respectively arranged at two ends with current limliting branch road in parallel.
2. the dynamic electric voltage recovery device with short circuit current limitation function according to claim 1 it is characterised in that：Described
Current limliting branch road includes current-limiting resistance and current-limiting inductance or reactor is in series current limiting device and switching tube.
3. the dynamic electric voltage recovery device with short circuit current limitation function according to claim 2 it is characterised in that：Described
Switching tube is all-controlling power electronics device or mechanical switch.
4. the dynamic electric voltage recovery device with short circuit current limitation function according to claim 1 it is characterised in that：Described
The topological structure of inverter is three-phase three-wire system half-bridge structure, three-phase four-wire system half-bridge structure, three-phase four-arm structure or each phase
Independent H bridge construction.
5. the dynamic electric voltage recovery device with short circuit current limitation function according to claim 1 it is characterised in that：Described
The topological structure of energy supply circuit is not control type rectification circuit, full-control type rectification circuit or the DC/DC circuit being connected with energy-storage battery.
6. the dynamic electric voltage recovery device with short circuit current limitation function according to claim 1 it is characterised in that：Described
By-pass switch is in parallel with the outfan of described coupling transformer.
7. the dynamic electric voltage recovery device with short circuit current limitation function according to claim 1 it is characterised in that：Described
The outfan of coupling transformer is connected with point of common coupling and sensitive load respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620934400.4U CN205986160U (en) | 2016-08-24 | 2016-08-24 | Dynamic voltage restorer with short -circuit current restricts function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620934400.4U CN205986160U (en) | 2016-08-24 | 2016-08-24 | Dynamic voltage restorer with short -circuit current restricts function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205986160U true CN205986160U (en) | 2017-02-22 |
Family
ID=58033787
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620934400.4U Expired - Fee Related CN205986160U (en) | 2016-08-24 | 2016-08-24 | Dynamic voltage restorer with short -circuit current restricts function |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205986160U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107785908A (en) * | 2016-08-24 | 2018-03-09 | 中电普瑞科技有限公司 | A kind of dynamic electric voltage recovery device with short circuit current limitation function |
| CN109586260A (en) * | 2018-10-30 | 2019-04-05 | 华北电力大学 | A kind of resistance sense type capacitor commutation blended learning and its control method |
-
2016
- 2016-08-24 CN CN201620934400.4U patent/CN205986160U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107785908A (en) * | 2016-08-24 | 2018-03-09 | 中电普瑞科技有限公司 | A kind of dynamic electric voltage recovery device with short circuit current limitation function |
| CN109586260A (en) * | 2018-10-30 | 2019-04-05 | 华北电力大学 | A kind of resistance sense type capacitor commutation blended learning and its control method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170222 |