CN109755924A - A kind of circuit topological structure of hybrid dc circuit breaker and direct current transmission and distribution system - Google Patents
A kind of circuit topological structure of hybrid dc circuit breaker and direct current transmission and distribution system Download PDFInfo
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Abstract
The present invention relates to a kind of hybrid dc circuit breaker and the circuit topological structures of direct current transmission and distribution system, wherein the circuit topological structure of direct current transmission and distribution system includes: DC line, disconnecting switch and hybrid dc circuit breaker；Any bar DC line is connected by the disconnecting switch with the hybrid dc circuit breaker, for the isolated fault route after failure removal；Any bar DC line is connected with two adjacent DC lines respectively by the connecting pin of the loop in the hybrid dc circuit breaker, for carrying normal current；The connecting pin that any bar DC line passes through the loop in the hybrid dc circuit breaker is connected with the parallel circuit in the hybrid dc circuit breaker, for two-way carrying and disengagement failure electric current.
Description
Technical field
The present invention relates to breaker technical field, in particular to a kind of hybrid dc circuit breaker and direct current transmission and distribution system
Circuit topological structure.
Background technique
With the development of the social economy, requirement of the user to power quality and power supply reliability is also promoted therewith, foundation can
It leans on, electric system flexibly, economic, environmentally friendly has become industry common recognition.Traditional AC distribution net have voltage transformation flexibly,
The advantages that protection technique is more mature is controlled, but is limited by transmission of electricity corridor, the transmission capacity of transmission line of alternation current is very
Difficulty meets the growing needs of power load.In recent years, it is with photovoltaic cell, wind-power electricity generation, fuel cell, biomass power generation
The generation of electricity by new energy of representative develops rapidly, however these renewable energy have to pass through DC/AC change between access AC network
It changes, this results in certain energy losses, seriously hinder the popularization of renewable energy.
Compared to AC network, cost is relatively low for direct current transmission and distribution system, and line loss is small and control is flexible, is conducive to be distributed
The access of formula power supply, energy storage device, micro-capacitance sensor and electric car, while the intrinsic stability problem of AC network is avoided, it can
See that the development prospect in direct current transmission and distribution system future is very bright.Currently, China is quickly grown in flexible direct-current transmission field, with
Zhoushan Multi-end flexible direct current transmission demonstration project and Nan'ao Multi-end flexible direct current transmission demonstration project are a series of flexibilities of representative
Direct current transportation is come into operation in succession.However there is no installations to have high-current on-off ability in these direct current transmission and distribution systems
Dc circuit breaker can only be straight to cut off by locking inverter or by the tripping of exchange side once short trouble occurs in system
Flow fault current, it means that entire direct current transmission and distribution system will stop transport in short-term, cause a large amount of load loss, and to AC network
It causes greatly to impact.If the dc circuit breaker with high-current on-off ability can be installed in direct current transmission and distribution system,
Faulty component in excision system rapidly when breaking down, guarantees the safe operation of system no failure part, just can greatly mention
The reliability of high direct current transmission and distribution system.
Key equipment of the dc circuit breaker as DC line networking can carry at the appointed time, cut-off normal electricity
Stream and fault current are the weights for improving direct current transmission and distribution system reliability to prevent the diffusion of direct current transmission and distribution system failure
Want means.The dc circuit breaker to come into operation earliest is mechanical dc circuit breaker, and main structure is Fast mechanical switch, outside
Portion is parallel with snubber circuit and oscillating circuit, carrys out the energy in absorption circuit by energy absorption circuit when cut-offfing, passes through
LC oscillation generates reversed resonance current to force main circuit current zero passage, to realize breaking direct current.Mechanical direct current is disconnected
The on-state loss of road device is lower, but cut-offs that speed is slower, is difficult to meet the needs of current direct current transmission and distribution system.And with open circuit
The capacity of the voltage rating of device and the promotion of drop-out current, inductance and capacitor in oscillating circuit is also promoted therewith with volume, sternly
Restrict the development of mechanical dc circuit breaker again.
Direction with power electronic devices towards high voltage, high current is developed, straight using device for high-power power electronic
The all solid state dc circuit breaker for connecing breaking direct current has received widespread attention.With gate turn off thyristor GTO, insulated gate bipolar
Transistor npn npn IGBT and integrated gate commutated thyristor IGCT is that the device for high-power power electronic of representative can be reliable rapidly
Breaking direct current, however the biggish conduction voltage drop of power electronic devices determines the on-state loss of all solid state dc circuit breaker very
Greatly.
Hybrid dc circuit breaker combines the advantages of mechanical dc circuit breaker and all solid state dc circuit breaker, at present
Through the important development direction for becoming dc circuit breaker.Traditionally hybrid dc circuit breaker structure is as shown in Figure 1, main includes fast
Fast mechanical switch branch, power electronic devices tandem tap branch, energy absorption branch and control system, after three branch circuit parallel connections
It is connected with control system, control system controls the on-off of three branches.Electric current flows through Fast mechanical switch in the case of normally
Branch；Breaker actuation when failure occurs, Fast mechanical switch separating brake, electric current are transferred to power electronic devices tandem tap branch
Road, subsequent power electronic devices tandem tap shutdown, route energy are absorbed by energy absorption branch, and line current drops to zero.
The shortcomings that hybrid dc circuit breaker, essentially consists in its high cost.The price of power electronic devices is very high
It is expensive, in the application of high voltage, it usually needs being used in series a large amount of power electronic devices to meet insulating requirements.This
Outside, mechanical switch can be with two-way through-flow, and power electronic devices needs just to be able to achieve two-way stream by modes such as the companies of playing a reversed role,
Cost further increases.The price of power electronic devices tandem tap is typically much higher than quick in actual hybrid circuit breaker
Mechanical switch.Therefore, how to reduce hybrid dc circuit breaker overall cost is urgent problem.
Summary of the invention
The present invention proposes the circuit topological structure of a kind of hybrid dc circuit breaker and direct current transmission and distribution system, and solution is being protected
Hold the problem of overall applicability cost is reduced on the basis of the original performance of hybrid dc circuit breaker.
To achieve the above object, the present invention provides a kind of hybrid dc circuit breakers, comprising:
Fast mechanical switch, bi-directional electric power electronic device tandem tap, energy absorption branch；Wherein,
The both ends of the Fast mechanical switch are connected with other two Fast mechanical switch respectively, so that hybrid direct current is disconnected
Fast mechanical switch in the device of road is sequentially connected, and forms loop, described in the port junction of two Fast mechanical switch is used as
The connecting pin of loop；
The bi-directional electric power electronic device tandem tap and the energy absorption branch form parallel circuit, the electricity in parallel
The one end on road is connected with the connecting pin in the loop, another connection in the other end of the parallel circuit and the loop
End is connected, so that each connecting pin of the loop is connected with one or two parallel circuits.
To achieve the above object, the present invention also provides a kind of circuit topological structures of direct current transmission and distribution system, comprising:
DC line, disconnecting switch and hybrid dc circuit breaker described above；Wherein,
Any bar DC line is connected by the disconnecting switch with the hybrid dc circuit breaker, in failure
Isolated fault route after excision；
Any bar DC line is by the connecting pin of the loop in the hybrid dc circuit breaker respectively with adjacent two
DC line is connected, for carrying normal current；
Any bar DC line pass through the connecting pin of the loop in the hybrid dc circuit breaker with it is described hybrid
Parallel circuit in dc circuit breaker is connected, for two-way carrying and disengagement failure electric current.
Preferably, the item number of the DC line is N；Wherein, N is even number.
Preferably, each disconnecting switch of the direct current transmission and distribution system is connected with a parallel circuit, and the parallel connection
The both ends of circuit are connected with the disconnecting switch of two DC lines respectively.
Preferably, the number of the Fast mechanical switch is M, and the number of the disconnecting switch is M, the bi-directional electric power electricity
The number of sub- devices in series switch is M/2, and the number of the energy absorption branch is M/2；Wherein, M is positive integer.
Preferably, the item number of the DC line is N；Wherein, N is odd number.
Preferably, corresponding disconnecting switch and a parallel connection on N-1 DC line in the direct current transmission and distribution system
Circuit connection, corresponding disconnecting switch is connected with two articles of parallel circuits on the N articles DC line, and the both ends of the parallel circuit
It is connected respectively with the disconnecting switch of two DC lines.
Preferably, the number of the Fast mechanical switch is N, and the number of the disconnecting switch is M, the bi-directional electric power electricity
The number of sub- devices in series switch is (M+1)/2, and the number of the energy absorption branch is (M+1)/2；Wherein, M is positive integer.
Above-mentioned technical proposal has the following beneficial effects:
It is connected 1. any DC line passes through two Fast mechanical switch respectively with two adjacent DC lines, uses
In carrying normal current；
2. any DC line is connected with a bi-directional electric power electronic device tandem tap, for carrying and cutting off
Fault current；
It is connected 3. any DC line passes through disconnecting switch with the new topology of the hybrid dc circuit breaker, is used for
Isolated fault route after failure removal.
The technical program key, which is to be utilized bi-directional electric power electronic device tandem tap, two-way carrying and to cut off electricity
The characteristic of stream enables two DC lines share a bi-directional electric power electronic device tandem tap, is keeping hybrid direct current interruption
To reduce equipment cost on the basis of the original performance of device.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1 is traditionally hybrid dc circuit breaker structural schematic diagram；
Fig. 2 is the schematic diagram of a four end flexible HVDC transmission systems；
Fig. 3 is a kind of one of circuit topological structure schematic diagram of hybrid dc circuit breaker provided in an embodiment of the present invention；
Fig. 4 is the two of a kind of circuit topological structure schematic diagram of hybrid dc circuit breaker provided in an embodiment of the present invention；
Fig. 5 is a kind of circuit of the direct current transmission and distribution system based on hybrid dc circuit breaker provided in an embodiment of the present invention
One of topological structure schematic diagram；
Fig. 6 is a kind of circuit of the direct current transmission and distribution system based on hybrid dc circuit breaker provided in an embodiment of the present invention
The two of topological structure schematic diagram.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
The working principle of the technical scheme is as follows: in Multi-end flexible direct current transmission system, it will usually which there are a plurality of direct currents
The joint of route.Fig. 2 is the schematic diagram of a four end flexible HVDC transmission systems.Wherein, AC network 1~4 is four only
Vertical AC network is connected by converter station 1~4 with DC grid respectively, and the exit of converter station 1~4 need to install breaker 1
~4, four DC lines are intersected in P point, need to install breaker 5~8 at P point.If these breakers are all made of hybrid
Dc circuit breaker, then the cost of whole system will be sufficiently expensive.If the breaker 5~8 that P point can be installed is integrated into one
Multiterminal element breaker, and by the topological quantity to reduce power electronics tandem tap of optimization, then under system cost will be significant
Drop.
Based on above-mentioned analysis, the present invention proposes a kind of hybrid dc circuit breaker.The hybrid dc circuit breaker includes: fast
Fast mechanical switch, bi-directional electric power electronic device tandem tap, energy absorption branch；Wherein,
The both ends of the Fast mechanical switch are connected with other two Fast mechanical switch respectively, so that hybrid direct current is disconnected
Fast mechanical switch in the device of road is sequentially connected, and forms loop, described in the port junction of two Fast mechanical switch is used as
The connecting pin of loop；
The bi-directional electric power electronic device tandem tap and the energy absorption branch form parallel circuit, the electricity in parallel
The one end on road is connected with the connecting pin in the loop, another connection in the other end of the parallel circuit and the loop
End is connected, so that each connecting pin of the loop is connected with one or two parallel circuits.
Further, when the number of the connecting pin of the loop is even number, each connecting pin of the loop is with one
Parallel circuit is connected.By taking the number of the connecting pin of loop is 4 as an example, as shown in Figure 3.When the number of the connecting pin of the loop
When for odd number, one of connecting pin of the loop is connected with two parallel circuits, remaining connecting pin of loop with one simultaneously
Join circuit to be connected.By taking the number of the connecting pin of loop is 3 as an example, as shown in Figure 4.
Based on the hybrid dc circuit breaker structure of above-mentioned two provided kind.The embodiment of the present invention provides two kinds based on hybrid
The direct current transmission and distribution system of dc circuit breaker.As shown in figure 5, to be provided in an embodiment of the present invention a kind of disconnected based on hybrid direct current
One of circuit topological structure schematic diagram of the direct current transmission and distribution system of road device.In Fig. 5, hybrid dc circuit breaker intermediate ring road
The number of connecting pin is 4, and accordingly, the item number of the DC line of direct current transmission and distribution system is also 4.Direct current transmission and distribution system packet
It includes:
4 DC lines, 4 disconnecting switch and the hybrid dc circuit breaker；The hybrid dc circuit breaker packet
It includes: 4 Fast mechanical switch, 2 bi-directional electric power electronic device tandem taps, 2 energy absorption branches；Wherein,
Any bar DC line is connected by the disconnecting switch with the hybrid dc circuit breaker, in failure
Isolated fault route after excision；
Any bar DC line by two Fast mechanical switch in the hybrid dc circuit breaker respectively with
Two adjacent DC lines are connected, for carrying normal current；
Any bar DC line with the bi-directional electric power electronic device tandem tap phase in the hybrid dc circuit breaker
Even, guarantee that the disconnecting switch on every DC line is connected with a bi-directional electric power electronic device, and the bi-directional electric power electronics
The both ends of devices in series switch are connected with the disconnecting switch of two DC lines respectively, for two-way carrying and disengagement failure electricity
Stream.Each bi-directional electric power electronic device tandem tap with energy absorption branch circuit parallel connection, stores in faulty line for absorbing
Energy, overvoltage when limitation bi-directional electric power electronic device tandem tap acts.
In Fig. 5, Q1~Q4 is disconnecting switch, is connect respectively with route 1~4；CB1~CB4 is Fast mechanical switch, point
It is not mounted between AB, BC, CD, AD two o'clock；U1, U2 are bi-directional electric power electronic device tandem tap, are connected across AC, BD two respectively
Between point；R1, R2 are energy absorption branch, in parallel with bi-directional electric power electronic device tandem tap U1, U2 respectively.When normal work
Fast mechanical switch CB1~CB4 conducting, for undertaking normal current, bi-directional electric power electronic device tandem tap U1, U2 keep closing
It is disconnected.The turn off process of the breaker can be divided into the following steps:
When short trouble occurs for route 1, disconnecting switch Q1 conducting, disconnecting switch itself does not have the energy of cutting electric current
Power will could only be disconnected by other devices after failure of current, for faulty component and normal segments to be isolated.Positive normal open
Disconnecting switch Q1 is connected under stream mode, and disconnecting switch Q1 is still connected after route 1 breaks down, until after failure removal is completed
Disconnecting switch Q1 could be disconnected.Fast mechanical switch CB1 and Fast mechanical switch CB4 is disconnected, with season bi-directional electric power electronics
Devices in series switch U1 conducting, then the fault current in Fast mechanical switch CB1 and Fast mechanical switch CB4 can be transferred to two-way
On power electronic devices tandem tap U1, when the electric current on Fast mechanical switch CB1 and Fast mechanical switch CB4 is reduced to zero and machine
After the clearance between open contacts of tool switch reach insulation distance, control bi-directional electric power electronic device tandem tap U1 shutdown, disengagement failure
Electric current.Bi-directional electric power electronic device tandem tap U1 shutdown moment, the energy stored in faulty line will be by energy absorption branch
R1 is absorbed, so that the overvoltage at the both ends bi-directional electric power electronic device tandem tap U1 is limited within safe range.
If necessary to high-speed reclosure, then bi-directional electric power electronic device tandem tap U1 is connected again, otherwise disconnects isolation
Switch Q1, faulty line is isolated, and subsequent Fast mechanical switch CB1 and Fast mechanical switch CB4 closes a floodgate again, and breaker returns
Original state.
The solution of remaining line failure is similar, only need to disconnect two mechanical switch being attached thereto, with season
With the route be connected bi-directional electric power electronic device tandem tap be connected, to the end of electric current conversion process after, control two-way electricity
The shutdown of power electronic device tandem tap, and disconnect the corresponding disconnecting switch of the route.
The new topology of the hybrid dc circuit breaker needs four Fast mechanical switch, four disconnecting switch and two in total
The two-way shutdown to four DC lines can be realized in bi-directional electric power electronic device tandem tap and two energy absorption branches, and
The performances such as turn-off speed and traditional scheme are completely the same.Due to Fast mechanical switch, disconnecting switch, the price of energy absorption branch
It almost can be ignored compared with bi-directional electric power electronic device tandem tap, therefore the equipment cost of new topology only has tradition side
The half of case.
As shown in fig. 6, being a kind of direct current transmission and distribution system based on hybrid dc circuit breaker provided in an embodiment of the present invention
The two of the circuit topological structure schematic diagram of system.In Fig. 6, the number of the connecting pin of hybrid dc circuit breaker intermediate ring road is 3, right
The item number of Ying Di, the DC line of direct current transmission and distribution system are also 3.Direct current transmission and distribution system includes:
3 DC lines, 3 disconnecting switch and the hybrid dc circuit breaker of the direct current transmission and distribution system；Institute
Stating hybrid dc circuit breaker includes: 3 Fast mechanical switch, 2 bi-directional electric power electronic device tandem taps, 2 energy suctions
Revenue and expenditure road；Wherein,
Any bar DC line is connected by the disconnecting switch with the hybrid dc circuit breaker, in failure
Isolated fault route after excision；
Any bar DC line by two Fast mechanical switch in the hybrid dc circuit breaker respectively with
Two adjacent DC lines are connected, for carrying normal current；
Any bar DC line with the bi-directional electric power electronic device tandem tap phase in the hybrid dc circuit breaker
Even, guarantee that the disconnecting switch on 2 DC lines is connected with a bi-directional electric power electronic device, on the 3rd article of DC line every
It leaves pass to connect with two bi-directional electric power electronic devices, and the both ends of the bi-directional electric power electronic device tandem tap are respectively with two
The disconnecting switch of DC line is connected, for two-way carrying and disengagement failure electric current.Each bi-directional electric power electronic device series connection
Switch limits bi-directional electric power electronic device string for absorbing the energy stored in faulty line with energy absorption branch circuit parallel connection
Join overvoltage when switch motion.
In Fig. 6, Q1~Q3 is disconnecting switch, is connect respectively with route 1~3；CB1~CB3 is Fast mechanical switch, point
It is not mounted between AB, BC, AC two o'clock；U1, U2 are bi-directional electric power electronic device tandem tap, are connected between AB, AC two o'clock.
In fact AC, BC point-to-point transmission or AB, BC point-to-point transmission are connected to.One bi-directional electric power electronic device tandem tap can be with two
A port is connected, as long as guaranteeing that each port is at least connected with a bidirectional power electronic switch.In the feelings of even port
Under condition, bidirectional power electronic switch is fully used；It is believed that must have a bi-directional electric power in the case where odd-numbered port
There is waste in electronic switch；R1, R2 are energy absorption branch, respectively simultaneously with bi-directional electric power electronic device tandem tap U1, U2
Connection.CB1~CB3 is connected when normal work, and for undertaking normal current, bi-directional electric power electronic device tandem tap U1, U2 are kept
Shutdown.The turn off process of the breaker can be divided into the following steps:
When short trouble occurs for route 1, Fast mechanical switch CB1 and Fast mechanical switch CB3 is disconnected, due to route 1
It is connect simultaneously with bi-directional electric power electronic device tandem tap U1, bi-directional electric power electronic device tandem tap U2, at this time using two-way
Power electronic devices tandem tap U1 or bi-directional electric power electronic device tandem tap U2 can complete shutdown, and selection enables double in this example
It is connected to power electronic devices tandem tap U1, then the fault current meeting in Fast mechanical switch CB1 and Fast mechanical switch CB3
It is transferred on bi-directional electric power electronic device tandem tap U1, the electric current on Fast mechanical switch CB1 and Fast mechanical switch CB3
Be reduced to zero and mechanical switch clearance between open contacts reach insulation distance after, control bi-directional electric power electronic device tandem tap U1 close
It is disconnected, disengagement failure electric current.Bi-directional electric power electronic device tandem tap U1 shutdown moment, the energy stored in faulty line will be by energy
Amount absorbs branch R1 and is absorbed, so that the overvoltage at the both ends bi-directional electric power electronic device tandem tap U1 is limited in safe range
Within.
If necessary to high-speed reclosure, then bi-directional electric power electronic device tandem tap U1 is connected again, otherwise disconnects isolation
Switch Q1, faulty line is isolated, and subsequent Fast mechanical switch CB1 and Fast mechanical switch CB3 closes a floodgate again, and breaker returns
Original state.
If route 2 or route 3 break down, two mechanical switch being attached thereto only need to be disconnected, with season and the route
Connected bi-directional electric power electronic device tandem tap conducting, to the end of electric current conversion process after, control bi-directional electric power electronics device
The shutdown of part tandem tap, and disconnect the corresponding disconnecting switch of the route.
By Fig. 3, Fig. 4, Fig. 5, Fig. 6 it is found that the scope of application of the technical program is extended to N-terminal DC network, then for
The node being connected in system with N DC line is not difficult to show that the hybrid dc circuit breaker needs N number of Fast mechanical switch, N
A disconnecting switch, N/2 (N is even number) or (N+1)/2 (N is odd number) bi-directional electric power electronic device tandem taps and N/2 are a
(N is even number) or (N+1)/2 (N is odd number) energy absorption branch.
The hybrid dc circuit breaker integrates more dc circuit breakers at a plurality of DC line joint.With
Traditional scheme is compared, and the technical program passes through reasonable disposition Fast mechanical switch branch and power electronic devices tandem tap branch
The mode of connection usage quantity of power electronic devices can at most be halved under the premise of maintaining original performance, thus aobvious
Writing reduces system cost.
Above-described specific embodiment has carried out further the purpose of the present invention, technical scheme and beneficial effects
It is described in detail, it should be understood that being not intended to limit the present invention the foregoing is merely a specific embodiment of the invention
Protection scope, all within the spirits and principles of the present invention, any modification, equivalent substitution, improvement and etc. done should all include
Within protection scope of the present invention.
Claims (8)
1. a kind of hybrid dc circuit breaker characterized by comprising
Fast mechanical switch, bi-directional electric power electronic device tandem tap, energy absorption branch；Wherein,
The both ends of the Fast mechanical switch are connected with other two Fast mechanical switch respectively, so that hybrid dc circuit breaker
In Fast mechanical switch be sequentially connected, form loop, the port junction of two Fast mechanical switch is as the loop
Connecting pin；
The bi-directional electric power electronic device tandem tap and the energy absorption branch form parallel circuit, the parallel circuit
One end is connected with the connecting pin in the loop, the other end of the parallel circuit and another connecting pin phase in the loop
Even, so that each connecting pin of the loop is connected with one or two parallel circuits.
2. a kind of circuit topological structure of direct current transmission and distribution system characterized by comprising
DC line, disconnecting switch and hybrid dc circuit breaker as described in claim 1；Wherein,
Any bar DC line is connected by the disconnecting switch with the hybrid dc circuit breaker, in failure removal
Isolated fault route afterwards；
Any bar DC line is straight with adjacent two respectively by the connecting pin of the loop in the hybrid dc circuit breaker
Flow Line is connected, for carrying normal current；
Any bar DC line pass through the loop in the hybrid dc circuit breaker connecting pin and the hybrid direct current
Parallel circuit in breaker is connected, for two-way carrying and disengagement failure electric current.
3. circuit topological structure as claimed in claim 2, which is characterized in that the item number of the DC line is N；Wherein, N is
Even number.
4. circuit topological structure as claimed in claim 3, which is characterized in that each of described direct current transmission and distribution system is kept apart
Pass is connected with a parallel circuit, and the both ends of the parallel circuit are connected with the disconnecting switch of two DC lines respectively.
5. circuit topological structure as claimed in claim 3, which is characterized in that the number of the Fast mechanical switch is M, described
The number of disconnecting switch is M, and the number of the bi-directional electric power electronic device tandem tap is M/2, the energy absorption branch
Number is M/2, wherein M is positive integer.
6. circuit topological structure as claimed in claim 2, which is characterized in that the item number of the DC line is N；Wherein, N is
Odd number.
7. circuit topological structure as claimed in claim 6, which is characterized in that the N-1 item in the direct current transmission and distribution system is straight
Corresponding disconnecting switch is connected with a parallel circuit on Flow Line, corresponding disconnecting switch and two articles on the N articles DC line
Parallel circuit connection, and the both ends of the parallel circuit are connected with the disconnecting switch of two DC lines respectively.
8. circuit topological structure as claimed in claim 6, which is characterized in that the number of the Fast mechanical switch is M, described
The number of disconnecting switch is M, and the number of the bi-directional electric power electronic device tandem tap is (M+1)/2, the energy absorption branch
The number on road is (M+1)/2；Wherein, M is positive integer.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110994419A (en) * | 2019-11-08 | 2020-04-10 | 广东电网有限责任公司 | Uninterrupted maintenance system and method for multi-port direct-current circuit breaker |
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