CN107086574A - The access circuit and control method and power flow control system of a kind of tidal current controller - Google Patents
The access circuit and control method and power flow control system of a kind of tidal current controller Download PDFInfo
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- CN107086574A CN107086574A CN201710288817.7A CN201710288817A CN107086574A CN 107086574 A CN107086574 A CN 107086574A CN 201710288817 A CN201710288817 A CN 201710288817A CN 107086574 A CN107086574 A CN 107086574A
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- 238000000034 method Methods 0.000 title claims abstract description 17
- 230000005611 electricity Effects 0.000 claims abstract description 42
- 230000005540 biological transmission Effects 0.000 claims abstract description 40
- 238000002955 isolation Methods 0.000 claims description 3
- 230000002708 enhancing effect Effects 0.000 abstract description 3
- 230000003068 static effect Effects 0.000 description 17
- 230000001360 synchronised effect Effects 0.000 description 16
- 238000010586 diagram Methods 0.000 description 6
- 238000012423 maintenance Methods 0.000 description 5
- 238000004804 winding Methods 0.000 description 4
- 230000000903 blocking effect Effects 0.000 description 2
- 238000013329 compounding Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000010363 phase shift Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/04—Circuit arrangements for ac mains or ac distribution networks for connecting networks of the same frequency but supplied from different sources
- H02J3/06—Controlling transfer of power between connected networks; Controlling sharing of load between connected networks
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
Abstract
The present invention provides a kind of the access circuit and control method and power flow control system of tidal current controller.The access circuit includes：First switch, for providing path when it is closed for the electric current of transmission line of electricity；4th switch, it is in parallel with the tidal current controller；Second switch and the 3rd switch, the 4th switch are connected in parallel by the second switch and the 3rd switch with the first switch.The control method includes when the access circuit is in original state：Close the 4th switch；Close the second switch and the 3rd switch；Disconnect the first switch；Judge whether the tidal current controller reaches preparatory condition；When the tidal current controller reaches preparatory condition, the 4th switch is disconnected.The present invention reduces tidal current controller during access transmission line of electricity to power system and the impact of equipment itself, reliability enhancing by carrying out rational switchgear distribution and switching operation to access circuit.
Description
Technical field
The present invention relates to technical field of electric power, and in particular to the access circuit and control method of a kind of tidal current controller and
Power flow control system.
Background technology
For the Line Flow of rationally control power network, the demand of tidal current controller access transmission line of electricity or access bus is more next
It is more.For example, tandem type tidal current controller access transmission line of electricity when, equivalent in the line series connection be filled with one it is controlled
Voltage source, voltage magnitude and phase can be adjusted.With the change of the amplitude and phase of series connection injecting voltage, tandem type trend control
Device processed can realize a variety of functions such as voltage-regulation, impedance-compensated, phase shift.Typical tandem type tidal current controller includes system
One flow controller, static series synchronous compensator etc..Being capable of reasonable control circuit using tandem type compensation device in power network
Trend, realizes economical operation, additionally it is possible to balanced trend, it is to avoid circuit overload, furthermore contributes to improve system damping, improves generator rotor angle
Stability.
But the system access mode of tandem type tidal current controller is extremely closed for can device smoothly cut power network
It is important, how to reduce device significant to power system and the impact of device itself during accessing or exiting.
When access voltage class is higher, tandem type tidal current controller is needed by coupling transformer access system, inappropriate to connect
Entering mode will cause and during net operation, because the reasons such as stray parameter produce undesirable overvoltage and overcurrent, threaten system
With the safe operation of equipment.
The content of the invention
The technical problem to be solved in the present invention is to overcome in existing tidal current controller access transmission line of electricity in access
Voltage class can not smoothly cut the defect that power network causes to cause system and equipment greater impact when higher.
The present invention provides a kind of access circuit of tidal current controller, including：
First switch, is accessed in transmission line of electricity, for the electricity when the first switch closes for the transmission line of electricity
Stream provides path；
4th switch, it is in parallel with the tidal current controller；
Second switch and the 3rd switch, the 4th switch pass through the second switch and the 3rd switch and described the
One switch in parallel is connected.
Preferably, the 4th switch uses power electronics rapid on-off apparatus or regular circuit breakers.
Preferably, the first switch, the second switch and the 3rd switch use isolation switch.
Preferably, the first switch, the second switch and the 3rd switch use power electronics quick-speed turning on-off
Device or regular circuit breakers.
Preferably, the first switch, the second switch and the 3rd switch are using connected in series or in parallel
Power electronics rapid on-off apparatus and regular circuit breakers.
Preferably, in the first switch, the second switch, the 3rd switch and the 4th switch at least
One one end is provided with grounding switch.
Preferably, the tidal current controller is tandem type tidal current controller or series connection plus parallel connection type power flowcontrol dress
Put.
The present invention also provides a kind of power flow control system, including：
The access circuit of above-mentioned tidal current controller；
Tidal current controller, is connected with the 4th switch in parallel of the access circuit.
The present invention also provides a kind of control method of the access circuit of tidal current controller, and the access circuit is in initial shape
During state, first switch is in closure state, and second switch, the 3rd switch and the 4th switch are respectively at gate-dividing state, the control
Method processed includes：
Close the 4th switch；
Close the second switch and the 3rd switch；
Disconnect the first switch；
Judge whether the tidal current controller reaches preparatory condition；
When the tidal current controller reaches preparatory condition, the 4th switch is disconnected.
Preferably, it is described to judge whether the tidal current controller reaches preparatory condition, including：
The current value and magnitude of voltage of the tidal current controller are compared with preset threshold range respectively；
When the current value and magnitude of voltage of the tidal current controller each fall within preset threshold range, the trend control is judged
Device processed reaches preparatory condition.
Preferably, described when the tidal current controller reaches preparatory condition, disconnect after the 4th switch, go back
Including：
Close the 4th switch；
Close the first switch；
Disconnect the second switch and the 3rd switch.
Technical solution of the present invention, has the following advantages that：
The present invention provides a kind of the access circuit and control method and power flow control system of tidal current controller.The access
Circuit includes：First switch, is accessed in transmission line of electricity, for the electricity when the first switch closes for the transmission line of electricity
Stream provides path；4th switch, it is in parallel with the tidal current controller；Second switch and the 3rd switch, the 4th switch are logical
Cross the second switch and the 3rd switch is connected in parallel with the first switch.The control method is in the access circuit
Include during in original state：Close the 4th switch；Close the second switch and the 3rd switch；Disconnect described
One switch；Judge whether the tidal current controller reaches preparatory condition；When the tidal current controller reaches preparatory condition,
Disconnect the 4th switch.The power flow control system includes：The access circuit of tidal current controller；Tidal current controller, with
The 4th switch in parallel connection of the access circuit.The present invention is grasped by the way that access circuit is carried out rational switchgear distribution and switched
Work order, farthest reduces tidal current controller during access transmission line of electricity to power system and equipment itself
Impact, realizes smooth incision power network, it is ensured that the safe operation of system and equipment, while make overhaul of the equipments more flexible, maintenance side
Just, reliability strengthens.
Brief description of the drawings
, below will be to specific in order to illustrate more clearly of the specific embodiment of the invention or technical scheme of the prior art
The accompanying drawing used required in embodiment or description of the prior art is briefly described, it should be apparent that, in describing below
Accompanying drawing is some embodiments of the present invention, for those of ordinary skill in the art, before creative work is not paid
Put, other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is a kind of connection diagram of the access circuit of tidal current controller；
Fig. 2 is the flow chart of the control method of the access circuit of the tidal current controller shown in Fig. 1；
Fig. 3 is a kind of connection diagram of the access circuit of THE UPFC；
Fig. 4 is a kind of connection diagram of the access circuit of static series synchronous compensator.
Reference：
The tie points of 1- first；The tie points of 2- first；
10- tidal current controllers；11- first switches；12- second switches；13- the 3rd is switched；14- the 4th is switched；
20- THE UPFCs；201- series transformers；202- transverters 1；203- transverters 2；21- first switches
QS13；22- second switches QS11；23- the 3rd switchs QS12；24- the 4th switchs QF11；
30- static series synchronous compensators；301- series transformers；302- converter valves；303- switchs QF2；31- first is opened
Close QS13；32- second switches QS11；33- the 3rd switchs QS12；34- the 4th switchs QF1.
Embodiment
Technical scheme is clearly and completely described below in conjunction with accompanying drawing, it is clear that described implementation
Example is a part of embodiment of the invention, rather than whole embodiments.Based on the embodiment in the present invention, ordinary skill
The every other embodiment that personnel are obtained under the premise of creative work is not made, belongs to the scope of protection of the invention.
In the description of the invention, it is necessary to explanation, term " " center ", " on ", " under ", "left", "right", " vertical ",
The orientation or position relationship of the instruction such as " level ", " interior ", " outer " be based on orientation shown in the drawings or position relationship, merely to
Be easy to the description present invention and simplify description, rather than indicate or imply signified device or element must have specific orientation,
With specific azimuth configuration and operation, therefore it is not considered as limiting the invention.In addition, term " first ", " second ",
" the 3rd " is only used for describing purpose, and it is not intended that indicating or implying relative importance.
In the description of the invention, it is necessary to illustrate, unless otherwise clearly defined and limited, term " installation ", " phase
Even ", " connection " should be interpreted broadly, for example, it may be being fixedly connected or being detachably connected, or be integrally connected；Can
To be mechanical connection or electrical connection；Can be joined directly together, can also be indirectly connected to by intermediary, can be with
It is the connection of two element internals, can is wireless connection or wired connection.For one of ordinary skill in the art
For, the concrete meaning of above-mentioned term in the present invention can be understood with concrete condition.
As long as in addition, technical characteristic involved in invention described below different embodiments non-structure each other
It can just be combined with each other into conflict.
Embodiment 1
The present embodiment provides a kind of access circuit of tidal current controller, connection diagram such as Fig. 1 institutes of the access circuit
Show.The transmission line of electricity that first tie point 1 and the first tie point 2 can have both been accessed in power network, is connected in transmission line of electricity, can also
The bus accessed in power system.Tidal current controller 10 passes through first switch 11, the switch of second switch the 12, the 3rd 13 and the 4th
Switch 14 is by the first tie point 1 and the access system of the first tie point 2.Specifically, tidal current controller 10 is tandem type trend control
Device processed or series connection plus parallel connection type tidal current controller, such as THE UPFC or static series synchronous compensator.
The access circuit includes tidal current controller 10, first switch 11, the switch of second switch the 12, the 3rd 13 and the 4th and opened
Close 14.First switch 11 is accessed in transmission line of electricity, for being carried when first switch 11 closes for the electric current of the transmission line of electricity
For path；4th switch 14 is in parallel with tidal current controller 10；4th switch 14 by second switch 12 and the 3rd switch 13 with
First switch 11 is connected in parallel.Specifically, the two ends of first switch 11 connect the first tie point 1 and the second tie point 2 respectively；The
Four switches 14 are directly parallel in the two ends of tidal current controller 10；One end of 4th switch 14 connects one end of second switch 12,
The other end of second switch 12 connects one end of first switch 11, accesses the first tie point 1；The other end connection of 4th switch 14
One end of 3rd switch 13；The other end of 3rd switch 13 connects the other end of first switch 11, accesses the second tie point 2.
The access circuit for the tidal current controller that the present invention is provided includes：First switch, accesses in transmission line of electricity, is used for
When the first switch closes path is provided for the electric current of the transmission line of electricity；4th switch, with the tidal current controller
It is in parallel；Second switch and the 3rd switch, the 4th switch pass through the second switch and the 3rd switch and described first
Switch in parallel is connected.By carrying out rational switchgear distribution and switching operation to access circuit, farthest reduce
Tidal current controller, to power system and the impact of equipment itself, realizes smooth incision power network during access transmission line of electricity,
The safe operation of guarantee system and equipment, while make overhaul of the equipments more flexible, easy to maintenance, reliability enhancing.
As one preferred embodiment, the 4th switch 14 uses power electronics rapid on-off apparatus or conventional open circuit
Device.First switch 11, the switch of second switch 12 and the 3rd 13 use isolation switch；Further, first switch 11, second open
The switch 13 of pass 12 and the 3rd can also use power electronics rapid on-off apparatus or regular circuit breakers；Further, first switch
11st, the switch of second switch 12 and the 3rd 13 can also use power electronics rapid on-off apparatus and routine connected in series or in parallel
Breaker.Specifically, first switch 11, the switch of second switch 12 and the 3rd 13 can be using machineries such as breaker, disconnecting switch
Switch, or the different implementations such as electronic power switch, also can be using different type mechanical switch and the string of electronic power switch
The form for joining or being connected in parallel.
Preferably, at least one one in first switch 11, the switch 14 of the switch of second switch the 12, the 3rd 13 and the 4th
End is provided with grounding switch, to facilitate maintenance.
Tidal current controller 10 include but is not limited to THE UPFC, static series synchronous compensator, phase shifter, can
Control phase shifter etc. possesses series connection access system, changes the device of trend.Be connected in parallel on the 4th 14 two ends of switch both can be series connection
Transformer or Transformer Winding that the transverter or tandem type tidal current controller of type tidal current controller are used,
Can be wave filter or other electric parts that tandem type tidal current controller is used.Specifically, with Unified Power Flow control
Illustrate the access circuit of the tidal current controller exemplified by device (UPFC) and static series synchronous compensator (SSSC) access system.
A kind of connection diagram of the access circuit of THE UPFC is as shown in Figure 3.It is unified tide in dotted line frame
Stream controller 20,201 is series transformer, and 202 be that transverter 1,203 is transverter 2.21 be first switch QS13, and 22 be the
Two switch QS11,23 be the 3rd switch QS12, and 24 be the 4th switch QF11.First switch QS13 is accessed in transmission line of electricity, is used
In providing path when first switch QS13 closes for the electric current of the transmission line of electricity；4th switch QF11 is controlled with Unified Power Flow
The series transformer 201 of device 20 is in parallel；4th switch QF11 passes through the switch QS12 of second switch QS11 and the 3rd and first switch
QS13 is connected in parallel.Specifically, first switch QS13 two ends connect the first tie point 1 and the second tie point 2 respectively；4th opens
Close the two ends that QF11 is directly parallel in series transformer 201；4th switch QF11 one end connection second switch QS11 one end,
Second switch QS11 other end connection first switch QS13 one end, accesses the first tie point 1；4th switch QF11's is another
End connection the 3rd switchs QS12 one end, the 3rd switch QS12 other end connection first switch QS13 other end, access the
Two tie points 2.
A kind of connection diagram of the access circuit of static series synchronous compensator is as shown in Figure 4.It is as quiet in dotted line frame
Only series connection synchronous compensator 30,301 is series transformer, and 302 be converter valve, and 303 be switch QF2.31 be first switch QS13,
32 be second switch QS11, and 33 be the 3rd switch QS12, and 34 be the 4th switch QF1.First switch QS13 is accessed in transmission line of electricity
In, for providing path when first switch QS13 closes for the electric current of the transmission line of electricity；4th switch QF1 and static series
The series transformer 301 of synchronous compensator 30 is in parallel；4th switch QF1 passes through the switch QS12 and the of second switch QS11 and the 3rd
One switch QS13 is connected in parallel.Specifically, first switch QS13 two ends connect the first tie point 1 and the second tie point 2 respectively；
4th switch QF1 is directly parallel in the two ends of series transformer 301；4th switch QF1 one end connection second switch QS11's
One end, second switch QS11 other end connection first switch QS13 one end, accesses the first tie point 1；4th switch QF1's
Other end connection the 3rd switchs QS12 one end, and the 3rd switch QS12 other end connection first switch QS13 other end connects
Enter the second tie point 3.
Embodiment 2
The present embodiment provides a kind of power flow control system, and the system includes the access circuit and trend described in embodiment 1
Control device, the tidal current controller is connected with the 4th switch in parallel of the access circuit.
The power flow control system that the present invention is provided, rational switchgear distribution and switching manipulation are carried out by accessing circuit to it
Sequentially, tidal current controller is farthest reduced to rush power system and equipment itself during access transmission line of electricity
Hit, realize smooth incision power network, it is ensured that the safe operation of system and equipment, while make overhaul of the equipments more flexible, it is easy to maintenance,
Reliability strengthens.
Embodiment 3
The present embodiment provides a kind of control method of the access circuit described in embodiment 1, and the access circuit is initial
During state, first switch is in closure state, and second switch, the 3rd switch and the 4th switch are respectively at gate-dividing state, the party
The flow chart of method is as shown in figure 1, comprise the following steps：
S1：Close the 4th switch.Tidal current controller can be received to be sent from Local or Remote control device
Access or exit the signal of power system.When tidal current controller detects the signal of access transmission line of electricity, power flowcontrol
Device, which starts control access circuit, to be carried out and net operation.Specifically, tidal current controller collection first switch, second switch, the
The switch position signal of three switches and the 4th switch, and comply with the condition of original state.Initial shape is in access circuit
During state, the 4th switch is closed first, the series connection winding two ends or converter valve two ends of tandem type tidal current controller are reliable
Bypass, makes series connection winding two ends or the output equipotential at converter valve two ends of tandem type tidal current controller.
S2：Close the second switch and the 3rd switch.Now the electric current of transmission line of electricity flows through first switch simultaneously,
And the branch road of second switch, the 3rd switch and the 4th switch series connection.Specifically, the closing order of second switch and the 3rd switch
It is interchangeable.
S3：Disconnect the first switch.Now the electric current of transmission line of electricity passes through second switch, the 3rd switch and the 4th completely
Switch the branch road of series connection.
S4：Judge whether the tidal current controller reaches preparatory condition.For example, the preparatory condition can be converter valve
State is controllable and no-voltage is exported.The tidal current controller is when reaching certain preparatory condition, and tidal current controller
The switch position signal of collection meets operation condition, just can access transmission line of electricity, is transmitted electricity with reducing tidal current controller in access
To power system and the impact of equipment itself during circuit, smooth incision power network is realized.Specifically, the step includes following son
Step：
S41：The current value and magnitude of voltage of the tidal current controller are compared with preset threshold range respectively.Specifically
Ground, the preset threshold range can include predetermined current threshold scope and predetermined voltage threshold scope, reach predetermined threshold value model
Electric current and voltage in enclosing can make the tidal current controller when accessing transmission line of electricity to power system and equipment itself
Impact is minimum.The tidal current controller can with the electric current and voltage of acquisition device itself, and by its with respectively with predetermined threshold value
Scope is compared.
S42：When the current value and magnitude of voltage of the tidal current controller each fall within preset threshold range, the tide is judged
Flow control device reaches preparatory condition.
S5：When the tidal current controller reaches preparatory condition, the 4th switch is disconnected, turns transmission line of electricity electric current
Move on among tidal current controller.
The control method of the access circuit for the tidal current controller that the present invention is provided, initial shape is in the access circuit
Include during state：Close the 4th switch；Close the second switch and the 3rd switch；Disconnect the first switch；Sentence
Whether the tidal current controller that breaks reaches preparatory condition；When the tidal current controller reaches preparatory condition, disconnect described
4th switch.By bypass breaker and every knife, the compounding practice of by-pass switch so that tidal current controller is in access system
When, its incoming end of connecting reliably is bypassed, so as to realize that tidal current controller no-voltage is through-flow, smoothly cuts power network, it is ensured that be
The safe operation of system and equipment, while make overhaul of the equipments more flexible, easy to maintenance, reliability enhancing.
Preferably, when tidal current controller detects the signal for exiting transmission line of electricity, tidal current controller starts control
Access circuit and carry out logout operation.I.e. after above-mentioned steps S5, in addition to：
S6：Close the 4th switch.When receive it is described exit the signal of transmission line of electricity when, the state of access circuit is
Second switch and the 3rd switch are closed, and first switch and the 4th switch disconnect, the electric current of transmission line of electricity flow through second switch,
Tidal current controller and the 3rd switch.The 4th switch is now closed, makes the series connection winding two ends of tidal current controller or changes
Flow valve output end equipotential.
S7：The first switch is closed, the electric current of transmission line of electricity is largely circulated through first switch.
S8：The second switch and the 3rd switch are disconnected, the electric current of transmission line of electricity is all circulated by first switch,
Tidal current controller is exited from system, and realization is electrically isolated completely to.Specifically, the disconnection order of second switch and the 3rd switch
It is interchangeable.
As a concrete implementation mode, respectively with shown in the THE UPFC (UPFC) and Fig. 4 shown in Fig. 3
Illustrate the control method of the access circuit exemplified by static series synchronous compensator (SSSC) access system.
For the THE UPFC 20 shown in Fig. 3, before access system, first switch QS13 closes a floodgate, second switch
QS11, the 3rd switch QS12, the 4th switch equal separating brakes of QF11, while overhauling earthing knife-switch is completely in a point position.And in net operation, protecting
On the premise of demonstrate,proving series transformer secondary circuit short-circuit, the first the 4th switch QF11 closes a floodgate；Subsequent second switch QS11, the 3rd switch
QS12 closes a floodgate；Subsequent first switch QS13 separating brakes；Judge whether THE UPFC reaches preparatory condition；When Unified Power Flow control
Device processed reaches that the preparatory condition i.e. series side of THE UPFC is reached after zero-voltage state, then the 4th switch QF11 is divided
Lock, THE UPFC series connection access system.
Under THE UPFC normal operating condition, second switch QS11 closes a floodgate, the 3rd switch QS12 closes a floodgate, and first
Switch QS13 separating brakes, the 4th switch QF11 separating brakes.When receiving the signal for exiting transmission line of electricity, the string of THE UPFC
Connection side goes to zero-voltage state, and subsequent 4th switch QF11 closes a floodgate；First switch QS13 closes a floodgate, change of current valve blocking；Second switch
QS11 separating brakes, the 3rd switch QS12 separating brakes, THE UPFC is exited from system.
For the static series synchronous compensator 30 shown in Fig. 4, before access transmission line of electricity, such as access 220kV power transmission lines
Road, first switch QS13 closes a floodgate, second switch QS11, the 3rd switch QS12, the 4th switch equal separating brakes of QF1, while overhauling earthing knife-switch
It is completely in a point position.And in net operation, on the premise of series transformer secondary circuit short-circuit is ensured, for example, can be closed a floodgate by QF2
Realize, the first the 4th switch QF1 closes a floodgate；Subsequent second switch QS11, the 3rd switch QS12 close a floodgate；Subsequent QS13 points of first switch
Lock；Judge whether static series synchronous compensator reaches preparatory condition；When static series synchronous compensator reaches preparatory condition i.e.
The converter valve of static series synchronous compensator is reached after zero-voltage state, then switchs QF1 separating brakes by the 4th, and static series are synchronously mended
Repay device series connection access transmission line of electricity.
Under static series synchronous compensator normal operating condition, second switch QS11 closes a floodgate, the 3rd switch QS12 closes a floodgate,
First switch QS13 separating brakes, the 4th switch QF1 separating brakes.When receiving the signal for exiting transmission line of electricity, static series are synchronously mended
The converter valve for repaying device goes to zero-voltage state, and subsequent 4th switch QF1 closes a floodgate；First switch QS13 closes a floodgate, change of current valve blocking；The
Two switch QS11 separating brakes, the 3rd switch QS12 separating brakes, static series synchronous compensator is exited from system.
Obviously, above-described embodiment is only intended to clearly illustrate example, and the not restriction to embodiment.It is right
For those of ordinary skill in the art, can also make on the basis of the above description it is other it is various forms of change or
Change.There is no necessity and possibility to exhaust all the enbodiments.And the obvious change thus extended out or
Among changing still in the protection domain of the invention.
Claims (11)
1. a kind of access circuit of tidal current controller, it is characterised in that including：
First switch, is accessed in transmission line of electricity, for being carried when the first switch closes for the electric current of the transmission line of electricity
For path；
4th switch, it is in parallel with the tidal current controller；
Second switch and the 3rd switch, the 4th switch are opened by the second switch and the 3rd switch with described first
Pass is connected in parallel.
2. access circuit according to claim 1, it is characterised in that the 4th switch uses power electronics quick-speed turning on-off
Device or regular circuit breakers.
3. access circuit according to claim 2, it is characterised in that the first switch, the second switch and described
3rd switch uses isolation switch.
4. access circuit according to claim 2, it is characterised in that the first switch, the second switch and described
3rd switch uses power electronics rapid on-off apparatus or regular circuit breakers.
5. access circuit according to claim 2, it is characterised in that the first switch, the second switch and described
3rd switch uses power electronics rapid on-off apparatus and regular circuit breakers connected in series or in parallel.
6. the access circuit according to any one of claim 1-5, it is characterised in that in the first switch, described
One end of at least one in two switches, the 3rd switch and the 4th switch is provided with grounding switch.
7. access circuit according to claim 1, it is characterised in that the tidal current controller is tandem type power flowcontrol
Device or series connection plus parallel connection type tidal current controller.
8. a kind of power flow control system, it is characterised in that including：
Access circuit any one of claim 1-7；
Tidal current controller, is connected with the 4th switch in parallel of the access circuit.
9. a kind of control method of the access circuit any one of claim 1-7, the access circuit is in original state
When, first switch is in closure state, and second switch, the 3rd switch and the 4th switch are respectively at gate-dividing state, and its feature exists
In, including：
Close the 4th switch；
Close the second switch and the 3rd switch；
Disconnect the first switch；
Judge whether the tidal current controller reaches preparatory condition；
When the tidal current controller reaches preparatory condition, the 4th switch is disconnected.
10. control method according to claim 9, it is characterised in that described to judge whether the tidal current controller reaches
To preparatory condition, including：
The current value and magnitude of voltage of the tidal current controller are compared with preset threshold range respectively；
When the current value and magnitude of voltage of the tidal current controller each fall within preset threshold range, the power flowcontrol dress is judged
Put and reach preparatory condition.
11. control method according to claim 9, it is characterised in that it is described when the tidal current controller reach it is pre-
If during condition, after disconnection the 4th switch, in addition to：
Close the 4th switch；
Close the first switch；
Disconnect the second switch and the 3rd switch.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710288817.7A CN107086574A (en) | 2017-04-27 | 2017-04-27 | The access circuit and control method and power flow control system of a kind of tidal current controller |
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| CN201710288817.7A CN107086574A (en) | 2017-04-27 | 2017-04-27 | The access circuit and control method and power flow control system of a kind of tidal current controller |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| WO2021209144A1 (en) * | 2020-04-17 | 2021-10-21 | Abb Power Grids Switzerland Ag | A voltage link arrangement between power distribution grids |
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