CN206481047U - A kind of current-limiting type UPFC protects system - Google Patents
A kind of current-limiting type UPFC protects system Download PDFInfo
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- CN206481047U CN206481047U CN201621463866.7U CN201621463866U CN206481047U CN 206481047 U CN206481047 U CN 206481047U CN 201621463866 U CN201621463866 U CN 201621463866U CN 206481047 U CN206481047 U CN 206481047U
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- 230000004224 protection Effects 0.000 claims abstract description 34
- 230000003139 buffering effect Effects 0.000 claims abstract description 18
- 238000001514 detection method Methods 0.000 claims description 14
- 239000000872 buffer Substances 0.000 claims description 6
- 230000006837 decompression Effects 0.000 claims description 5
- 230000005611 electricity Effects 0.000 claims description 3
- 230000003111 delayed effect Effects 0.000 claims 1
- 239000003990 capacitor Substances 0.000 description 10
- 238000000034 method Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 238000004146 energy storage Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
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Abstract
The utility model discloses a kind of current-limiting type UPFC protections system; including UPFC; the UPFC ends of incoming cables pass sequentially through inlet wire buffering filter circuit, shunt transformer and are connected with three-phase circuit, and the UPFC leading-out terminals pass sequentially through outlet buffering filter circuit, series transformer and are connected with current limiter；Inlet wire current foldback circuit is in series between the inlet wire buffering filter circuit and shunt transformer, output overvoltage protection circuit is parallel between the outlet buffering filter circuit and series transformer, the series transformer is directly accessed three-phase circuit.Above-mentioned current-limiting type UPFC protects system, by inlet wire current foldback circuit and output overvoltage protection circuit, and current-limiting type UPFC can be protected to be endangered from over-voltage and over-current, and protects auto-action, without time delay.
Description
Technical field
The utility model is related to a kind of current-limiting type UPFC protections system, belongs to electric network protection field.
Background technology
THE UPFC（Unified Power Flow Controller, UPFC）Be current comprehensive function the most
Powerful FACTS devices.But the UPFC of real input industrialization operation is few in world wide so far, and it should in industrialization
Problems are also there are on road.For example, it must have reply system short-circuit fault electric current and system high voltage impact
Ability to ensure that itself is without prejudice.The scholar of Zhejiang University proposes a kind of current-limiting type UPFC on the basis of UPFC, can
Short trouble and voltge surge are tackled, and successfully manufactures experimently 10kV model machines.But in high-pressure system, current-limiting type UPFC also exists as follows
Problem：1）The inlet wire overcurrent problem that DC capacitor charge-carrying belt comes in current-limiting type UPFC start-up courses；2）Short circuit current flow is to inversion
The impact of bridge and to the overvoltage problem etc. of being charged caused by DC capacitor.
In view of this, the present inventor is studied this, specially develops a kind of current-limiting type UPFC protection system, this case by
This is produced.
Utility model content
The purpose of this utility model is to provide a kind of current-limiting type UPFC protections system.
To achieve these goals, solution of the present utility model is：
A kind of current-limiting type UPFC protects system, including UPFC, and the UPFC ends of incoming cables pass sequentially through inlet wire buffering filtered electrical
Road, shunt transformer are connected with three-phase circuit, and the UPFC leading-out terminals pass sequentially through outlet buffering filter circuit, series transformer
It is connected with current limiter；Inlet wire current foldback circuit is in series between the inlet wire buffering filter circuit and shunt transformer, it is described
Outlet is buffered and is parallel with output overvoltage protection circuit between filter circuit and series transformer, and the series transformer is directly accessed
Three-phase circuit.
Preferably, the inlet wire current foldback circuit includes main switch, charging resistor plate, charge switch and time relay
Device, the main switch is serially connected in inlet wire main road, and being connected in parallel on master after charging resistor plate and charge switch, time relay concatenation opens
The two ends of pass, the charging resistor plate includes charging resistor and relay, and the charging resistor and inlet wire buffer filter circuit
Filter inductance is connected, and can prevent that charging current is excessive and DC capacitor is overcharged.
Preferably, the inlet wire current foldback circuit further comprises stage transformer and secondary transformer, three-phase electricity
Pressure is depressured to 220V by stage transformer and powered up for main switch coil without tension, then is after secondary transformer decompression and rectification
The time relay and conventional relays provide dc source, and charge switch is arranged between secondary transformer and charging resistor plate,
For controlling whether charging resistor plate charges.
Preferably, the output overvoltage protection circuit, which includes overvoltage detection controller, the overvoltage, detects controller
Outlet side is parallel with IGCT and rectifier bridge.
Preferably, resistance of the overvoltage detection controller including several interconnections, electric capacity, diode, voltage stabilizing two
Pole pipe and triode.Overvoltage detection controller can provide stable trigger current until current limiter circuit acts for IGCT.
Preferably, the inlet wire buffering filter circuit includes the several filter inductances being serially connected on inlet wire main road.
Preferably, the outlet buffering filter circuit includes the several filter inductances being serially connected on outlet main road.
Preferably, the current limiter circuit includes rectifier bridge parallel with one another, continued flow tube and current-limiting inductance, the rectification
Bridge by thyristor groups into.
Current-limiting type UPFC protects System Working Principle：When current-limiting type UPFC devices start, electric current is from three-phase circuit sending end
Filter circuit is buffered by shunt transformer, inlet wire current foldback circuit, inlet wire to charge to the DC capacitor in UPFC, the process
Referred to as uncontrollable rectifier is charged, and the duration is set by the time relay in inlet wire current foldback circuit, after the process terminates, is entered
Main switch closure in line current foldback circuit, inlet wire current foldback circuit is short-circuited, UPFC normal works, output over-voltage protection
Circuit and current limiter do not work；When at UPFC devices short trouble occurs for three-phase circuit receiving end, output overvoltage is protected
Overvoltage detection controller detects failure and triggers turn on thyristors in protection circuit so that inlet wire buffers filter circuit leading-out terminal quilt
Three-phase short circuit, UPFC is protected, while current limiter inserts current-limiting inductance L by series transformer to three-phase system is no-delaydc,
Limit the amplitude and the rate of climb of system short-circuit electric current.
Compared with prior art, current-limiting type UPFC protections system described in the utility model has the following advantages that：
1st, by inlet wire current foldback circuit and output overvoltage protection circuit, current-limiting type UPFC can be protected to be pressed through from crossing
Stream harm, and auto-action is protected, without time delay；
2nd, chosen by carrying out appropriate parameter to charging resistor, filter inductance, diode and IGCT, current-limiting type UPFC
Protection system is applicable to the protection of different voltage class, especially high-voltage current-limiting UPFC；
3rd, because under nominal situation, inlet wire overcurrent protection is shorted after the charging of DC capacitor uncontrollable rectifier terminates, and is exported
Overvoltage crowbar is failure to actuate, and current limiter continued flow tube, which is turned on, causes current-limiting inductance to be shorted, therefore this protection system is to current-limiting type
UPFC conventional operation has little to no effect；
The utility model is described in further detail below in conjunction with drawings and the specific embodiments.
Brief description of the drawings
Fig. 1 protects systematic schematic diagram for the current-limiting type UPFC of the present embodiment；
Fig. 2 is the inlet wire current foldback circuit schematic diagram of the present embodiment；
Fig. 3 is the circuit reduction figure after the overvoltage protection action of the present embodiment；
Fig. 4 detects controller internal circuit diagram for the overvoltage of the present embodiment.
Embodiment
As shown in figure 1, a kind of current-limiting type UPFC protections system, including UPFC 1, the ends of incoming cables of UPFC 1 are passed sequentially through
Inlet wire buffering filter circuit 2, shunt transformer 3 are connected with three-phase circuit sending end, and the leading-out terminals of UPFC 1 are passed sequentially through out
Line buffering filter circuit 4, the secondary of series transformer 5 are connected with current limiter 8；The inlet wire buffering filter circuit 2 and parallel pressure change
Inlet wire current foldback circuit 6 is in series between device 3, it is in parallel between the outlet buffering filter circuit 4 and the secondary of series transformer 5
There is output overvoltage protection circuit 7, the source side of series transformer 5, which is directly connected, accesses three-phase circuit receiving end.
As shown in Fig. 2 in the present embodiment, the inlet wire current foldback circuit 6 includes main switch Q1, charging resistor plate
61st, charge switch K and time relay Jt, the main switch Q1 are serially connected in inlet wire main road, and charging resistor plate 61 and charging are opened
Close the two ends that main switch Q1 is connected in parallel on after K, the time relay Jt concatenation.The charging resistor plate 61 includes charging resistor R and normal
Relay J1-J3 is advised, the filter inductance series connection of charging resistor R and inlet wire the buffering filter circuit 2 can prevent charging current
Excessive and UPFC internal direct current electric capacity is overcharged.The charging resistor R uses high-power charging resistor, and design parameter is according to difference
The system of voltage class is adjusted correspondingly.
The inlet wire current foldback circuit 6 also includes stage transformer T0 and secondary transformer T1, and three-phase voltage passes through one
The T0 decompressions of level transformer are that 220V is the power-up of main switch coil without tension, are then after secondary transformer T1 decompressions and rectification again
The time relay and conventional relays provide dc source, and charge switch K is arranged on secondary transformer T1 and charging resistor plate 61
Between, for controlling whether charging resistor plate 61 charges.
The course of work of inlet wire current foldback circuit 6 is：
1）Before inlet wire is powered, charge switch K is got into closure；
2）After inlet wire is powered, effectively, main switch Q1 coil without tension is powered up stage transformer T0 output voltages, secondary transformer
Effectively, conventional relays coil J1, J2, J3 that time relay Jt starts in timing, charging resistor plate 61 are returned T1 output voltages
Road energization adhesive switch, three blocks of charging resistor plates 61 charge to the DC capacitor C in main circuit UPFC1；
3）Charging interval is according to RC constant regulating time relays Jt；
4）After time relay Jt delays terminate, main switch Q1 automatic energy storages, automatic closing；
5）After inlet wire disjunction, primary voltage disappears, main switch Q1 coil without tension power down, main switch Q1 tripping operation disjunctions, also
Available for emergency separating brake.
Inlet wire current foldback circuit 6 described in the present embodiment is self-starting inlet wire current foldback circuit, using resistance R and
Filter inductance L connects, to prevent that charging current is excessive and DC capacitor is overcharged.After charging is completed, main switch is automatically controlled
Q1 closes a floodgate, short circuit charging resistor R.
In the present embodiment, the output overvoltage protection circuit 7 includes overvoltage detection controller 71, the pressure detection control
The outlet side of device 71 is parallel with IGCT TH7 and rectifier bridge, and the rectifier bridge is made up of diode DM1 ~ DM6.Occur in system
Short trouble occurs after overvoltage, the overvoltage detection triggering bypass IGCT TH7 of controller 71, by the mistake of output buffer inductance
Cross, it is ensured that IGBT inverter bridges in main circuit UPFC1 will not overcurrent, while by high voltage short circuit dash current（System occurs short
Road failure, has the IGBT inverter bridges that very big short circuit current flow is coupled to UPFC by series transformer）It is transferred to the brilliant lock of bypass
Pipe TH7, and gradually decay to zero.Between a3, c3 as shown in figure 3, there is voltage in circuit model after overvoltage protection action
During beyond the detection voltage of protection cabinet setting, IGCT TH7 is triggered conducting, and Ldc electric currents are through DM1 → TH7 → DM2 returns, shape
Into loop.
As shown in figure 4, resistance of the overvoltage detection controller 71 including several interconnections, electric capacity, diode, voltage stabilizing
Diode and triode.Its main thought is to pass through the 6th resistance using the D point voltages gradually risen in short-circuit processR 6, the 5th
ResistanceR 5Partial pressure controls the current potential of C points, to reduce controllable accurate voltage sourceT sCurrent potential (B points current potential), make the first triodeT k1Conducting, so as to pass through the second voltage-regulator diodeZ 2, 3rd resistorR 3, first resistorR 1Partial pressure control IGCT TH7 conductings, reach
To the purpose of three-phase short circuit.Simultaneously as IGCT TH7 conducting, the 3rd electric capacityC 3Voltage can pass through the 7th resistanceR 7- crystalline substance lock
The electric capacity of pipe TH7- the 3rdC 3Loop electric discharge is gradually reduced, and is caused the rising of B point voltages, is caused the first triodeT k1It is unstable, Fig. 4
Middle other auxiliary circuits are just solving this problem：1）3rd electric capacityC 3It is circuit in IGCT TH7 using energy storage bulky capacitor
Of short duration voltage support is provided after opening, the voltage of D points is maintained on certain voltage value.2）First triodeT k1Conducting is same
When, the second triodeT k2It is also turned on, C point voltages pass throughR 6WithR 4||R 5Partial pressure is produced so that the intrinsic standoff ratio of C points is uprised, in D
Of short duration maintenance C point voltages while point voltage declines, it is ensured that the voltage difference that 2 points of A, B can maintain the first triode Tk1Persistently lead
It is logical, stable trigger current is provided for IGCT TH7 until current limiter module action, disconnects secondary system side.Pass through overvoltage inspection
Controller 71 is surveyed, output overvoltage protection circuit 7 can be enable in certain time（Selected with the parameter of the overvoltage detection element of controller 71
Type is relevant）Interior maintenance IGCT TH7 is reliably turned on, so as to ensure before current limiter circuit cuts off short trouble（20ms
It is interior）, DC bus capacitor and IGBT transverters in UPFC1 can be protected preferably.
Current-limiting type UPFC protects System Working Principle：When current-limiting type UPFC devices start, electric current is from three-phase circuit sending end
Filter circuit 2 is buffered by shunt transformer 3, inlet wire current foldback circuit 6, inlet wire to charge to the DC capacitor in UPFC1, should
Process is referred to as uncontrollable rectifier charging, and the duration is set by the time relay in inlet wire current foldback circuit 6, and the process terminates
Afterwards, the main switch Q1 closures in inlet wire current foldback circuit 6, inlet wire current foldback circuit 6 is short-circuited, and UPFC1 normal works are defeated
Go out overvoltage crowbar 7 and current limiter 8 does not work；It is defeated when occurring short trouble at three-phase circuit receiving end approaching device
It has overvoltage detection controller in overvoltage crowbar 7 to detect failure and trigger TH7 conductings so that inlet wire buffers filter circuit 2
Leading-out terminal is protected by three-phase short circuit, UPFC 1, while current limiter 8 is inserted by series transformer 5 to three-phase system is no-delay
Enter current-limiting inductance Ldc, limit the amplitude and the rate of climb of system short-circuit electric current.
Above-described embodiment and schema and non-limiting product form of the present utility model and style, any art
Appropriate change or modification that those of ordinary skill is done to it, all should be regarded as not departing from patent category of the present utility model.
Claims (8)
1. a kind of current-limiting type UPFC protects system, it is characterised in that：Including UPFC, the UPFC ends of incoming cables pass sequentially through inlet wire and delayed
Rush filter circuit, shunt transformer with three-phase circuit to be connected, the UPFC leading-out terminals pass sequentially through outlet buffering filter circuit, string
Connection transformer is connected with current limiter；Inlet wire overcurrent protection electricity is in series between the inlet wire buffering filter circuit and shunt transformer
Road, output overvoltage protection circuit, the series transformer are parallel between the outlet buffering filter circuit and series transformer
It is directly accessed three-phase circuit.
2. a kind of current-limiting type UPFC protections system as claimed in claim 1, it is characterised in that：The inlet wire current foldback circuit
Including main switch, charging resistor plate, charge switch and the time relay, the main switch is serially connected in inlet wire main road, charging electricity
The two ends of main switch are connected in parallel on after baffle-wall and charge switch, time relay concatenation, the charging resistor plate includes charging resistor
And relay, the filter inductance series connection of the charging resistor and inlet wire buffering filter circuit.
3. a kind of current-limiting type UPFC protections system as claimed in claim 2, it is characterised in that：The inlet wire current foldback circuit
Further comprise stage transformer and secondary transformer, three-phase voltage is depressured to 220V for main switch decompression by stage transformer
Coil energization, then by secondary transformer decompression and rectification after be that the time relay and conventional relays provide dc source, fill
Electric switch is arranged between secondary transformer and charging resistor plate, for controlling whether charging resistor plate charges.
4. a kind of current-limiting type UPFC protections system as claimed in claim 1, it is characterised in that：The output overvoltage protection circuit
Including overvoltage detection controller, the outlet side of the overvoltage detection controller is parallel with IGCT and rectifier bridge.
5. a kind of current-limiting type UPFC protections system as claimed in claim 1, it is characterised in that：The overvoltage detection controller bag
Include resistance, electric capacity, diode, voltage-regulator diode and the triode of several interconnections.
6. a kind of current-limiting type UPFC protections system as claimed in claim 1, it is characterised in that：The inlet wire buffers filter circuit
Including the several filter inductances being serially connected on inlet wire main road.
7. a kind of current-limiting type UPFC protections system as claimed in claim 1, it is characterised in that：The outlet buffers filter circuit
Including the several filter inductances being serially connected on outlet main road.
8. a kind of current-limiting type UPFC protections system as claimed in claim 1, it is characterised in that：The current limiter circuit includes phase
Mutually in parallel rectifier bridge, continued flow tube and current-limiting inductance, the rectifier bridge by thyristor groups into.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621463866.7U CN206481047U (en) | 2016-12-29 | 2016-12-29 | A kind of current-limiting type UPFC protects system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621463866.7U CN206481047U (en) | 2016-12-29 | 2016-12-29 | A kind of current-limiting type UPFC protects system |
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| Publication Number | Publication Date |
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| CN206481047U true CN206481047U (en) | 2017-09-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201621463866.7U Expired - Fee Related CN206481047U (en) | 2016-12-29 | 2016-12-29 | A kind of current-limiting type UPFC protects system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106505531A (en) * | 2016-12-29 | 2017-03-15 | 国网浙江省电力公司绍兴供电公司 | A kind of current-limiting type UPFC protection systems |
| US11602022B2 (en) | 2020-12-23 | 2023-03-07 | B/E Aerospace, Inc. | Isolated voltage detection with current limiters |
-
2016
- 2016-12-29 CN CN201621463866.7U patent/CN206481047U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106505531A (en) * | 2016-12-29 | 2017-03-15 | 国网浙江省电力公司绍兴供电公司 | A kind of current-limiting type UPFC protection systems |
| US11602022B2 (en) | 2020-12-23 | 2023-03-07 | B/E Aerospace, Inc. | Isolated voltage detection with current limiters |
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Granted publication date: 20170908 Termination date: 20171229 |