CN108400586A - A kind of distributed fault self-healing method suitable for active power distribution network - Google Patents
A kind of distributed fault self-healing method suitable for active power distribution network Download PDFInfo
- Publication number
- CN108400586A CN108400586A CN201810145063.4A CN201810145063A CN108400586A CN 108400586 A CN108400586 A CN 108400586A CN 201810145063 A CN201810145063 A CN 201810145063A CN 108400586 A CN108400586 A CN 108400586A
- Authority
- CN
- China
- Prior art keywords
- intelligent terminal
- terminal unit
- generation resource
- fault
- distributed
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- 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
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/261—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations
- H02H7/262—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations involving transmissions of switching or blocking orders
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/261—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations
- H02H7/263—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations involving transmissions of measured values
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/28—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured for meshed systems
-
- 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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
-
- 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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/388—Islanding, i.e. disconnection of local power supply from the network
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
Abstract
The invention discloses a kind of distributed fault self-healing methods suitable for active power distribution network, including distribution feeder self-healing control step and the protection rate-determining steps at distributed generation resource points of common connection；In the distribution feeder self-healing control step, peer-to-peer communications between intelligent terminal unit at active power distribution network feeder breaker are set, when section breaks down, the intelligent terminal unit at section both ends where fault point judges failure and controls the short-circuiting device tripping of guilty culprit section；If intelligent terminal unit detects the on off state variation of local breaker at feeder breaker; the circuit breaker switch state after variation is then sent to the intelligent terminal unit at each distributed generation resource points of common connection, carries out the protection rate-determining steps at distributed generation resource points of common connection；The present invention fully considers the cooperation and coordination of the program and the anti-isolated island protection of distributed generation resource in failover procedure, distributed generation resource can be kept to be incorporated into the power networks to greatest extent.
Description
Technical field
The present invention relates to electric system active power distribution network fault self-recovery technical fields, are suitable for more particularly to one kind active
The distributed fault self-healing method of power distribution network.
Background technology
Conventional electrical distribution net is generally single supply, radial pattern structure, and direction of tide is constant, and relaying configuration is simple.Work as distribution
After accessing a large amount of, high permeability distributed generation resource in net, the structure of distribution can change with direction of tide, to shadow
The original protection of power distribution network and reclosing function are rung, false protection, tripping or unsuccessful reclosing are caused.To ensure active distribution
The safe and stable operation of net improves power supply reliability, needs to formulate a kind of new fault self-recovery according to the characteristics of active power distribution network
Method, to achieve the purpose that fault section location, fault section isolation, non-faulting section service restoration.
All kinds of corrupt practices creep in for distributed generator islanding operation, is unfavorable for system safety, therefore most of distributed generation resource all has
There is anti-isolated island defencive function.Early stage distributed generation resource accesses power distribution network, grid requirements are in system jam, distributed electrical
When the islet operation of source, anti-isolated island protection act exits the operation of distributed generation resource.Although this way is conducive to system safety,
But there is no play power supply enabling capabilities of the distributed generation resource in system failure period.In order to make distributed generation resource as much as possible
It is incorporated into the power networks, requires distributed generation resource that there is low voltage ride-through capability again in the regulation of some countries and grid company, i.e., one
Being incorporated into the power networks for distributed generation resource is kept under fixed condition.The anti-isolated island of distributed generation resource is protected needs phase with low voltage ride-through capability
Mutually coordinate, the two also needs to match with protection for feed line, reclosing function, this just at distributed generation resource grid entry point protection and
Control proposes higher requirement.
So in order to adapt to the case where distributed generation resource largely accesses power distribution network, need to provide one kind for active power distribution network
More perfect fault self-recovery method.
Invention content
In order to solve the deficiencies in the prior art, the present invention provides a kind of distributed faults suitable for active power distribution network certainly
Curing method utilizes the intelligent terminal unit being installed at distribution feeder breaker and the commonly connected point breaker of distributed generation resource
Realize that fault self-recovery, this method take full advantage of the communication capacity between intelligent terminal unit, each intelligent terminal unit can be into
Row information is exchanged to be identified with network topology, to realize the positioning of active power distribution network fast failure, Fault Isolation and fault recovery.It should
Intelligent terminal unit in method at distributed generation resource points of common connection can coordinate anti-isolated island protection and be controlled with low voltage crossing,
It can also be matched with protection for feed line, reclosing function.
A kind of distributed fault self-healing method suitable for active power distribution network, including distribution feeder self-healing control step with
Protection rate-determining steps at distributed generation resource points of common connection；
In the distribution feeder self-healing control step, the intelligent terminal list that is arranged at active power distribution network feeder breaker
Peer-to-peer communications between member, when section breaks down, the intelligent terminal unit at section both ends judges failure where fault point
And control the short-circuiting device tripping of guilty culprit section；
If intelligent terminal unit detects the on off state variation of local breaker at feeder breaker, after variation
Circuit breaker switch state is sent to the intelligent terminal unit at each distributed generation resource points of common connection, and it is public to carry out distributed generation resource
Protection rate-determining steps at tie point altogether；
In protection rate-determining steps at the distributed generation resource points of common connection, after receiving switch changed position information, distribution
Intelligent terminal unit judges at formula power supply points of common connection break down, into low voltage crossing process, in low voltage crossing
During progress, if voltage is less than setting value, tripping distributed generation resource points of common connection at distributed generation resource points of common connection
The switch at place exits distributed generation resource operation, after the completion of low voltage crossing, intelligent terminal at distributed generation resource points of common connection
Unit judges whether distributed generation resource is in island state according to current network topology, if so, also exiting distributed generation resource fortune
Row.
Further, in the distribution feeder self-healing control step, when section breaks down, section two where fault point
When local intelligent terminal unit detects jump-value of current and starts in the intelligent terminal unit at end, local intelligent terminal unit meter
This side fault current data is calculated, and fault current request of data is sent to the opposite end intelligent terminal unit of this section；
After opposite end intelligent terminal unit receives local fault current request of data, opposite end intelligent terminal unit by this side
The fault current data being computed are sent to local intelligent terminal unit；
After receiving the fault current data that other side sends, local intelligent terminal unit is sentenced using both ends current data
Whether other failure is in this section, if it is, tripping local terminal breaker immediately, is receiving the same of peer failure current data
When, differentiate opposite end weak feedback situation whether occurs, if so, and failure be located in area, then local intelligent terminal unit to opposite end hair
Send tripping control command.
Further, in the distribution feeder self-healing control step, when section breaks down, in section both ends breaker
After tripping, start reclosing operation after be delayed a period of time close to the intelligent terminal unit of system power supply side, if coincidence at
Work(then notifies the intelligent terminal unit of remote mains side to overlap, if unsuccessful reclosing, order of closing a floodgate is sent to interconnection switch；
Intelligent terminal unit closes interconnection switch, to restore non-faulting after receiving remote control combined floodgate order at interconnection switch
Block supply.
Further, the local intelligent terminal unit calculates this side fault current data, and to the opposite end intelligence of this section
It refers to the latter cycle using the current break moment that energy terminal unit, which sends fault current data in fault current request of data,
The calculated correlated current data of three-phase current data sampling point institute, protection philosophy used by protection scheme is different, required
Fault current data are also different, should be calculated according to actual needs.
Further, in the distribution feeder self-healing control step, when section breaks down, section two where fault point
When local intelligent terminal unit detects jump-value of current and starts in the intelligent terminal unit at end, opposite end intelligent terminal unit
Transient detection element is not actuated, after receiving data request command, will send and is all zero fault current data to local intelligence
It can terminal unit.
Further, the failure protection scheme employed in the distribution feeder self-healing control step is positive sequence failure point
Current differential protection, the protection of current amplitude comparison expression or full current differential protection are measured, fault current data should include positive sequence failure
Current weight and total current amplitude after failure.
Further, in the distribution feeder self-healing control step, if the electric current that opposite end intelligent terminal unit is sent
The small Mr. Yu's setting value of amplitude then judges that weak feedback situation occurs for opposite end intelligent terminal unit, to realize that Fault Isolation, local intelligent are whole
End unit needs to send remote control trip signal to opposite end intelligent terminal unit.
Further, checkout voltage is carried out first when starting reclosing operation close to mains side intelligent terminal unit, if under
Trip feeder line does not have voltage, then sends out combined floodgate order, close nearly mains side breaker；
Remote mains side intelligent terminal carries out checkout voltage, if downstream first after the message for receiving opposite end closing success
Distributed generation resource has dropped out operation, then downstream feeder line no-voltage, and remote mains side intelligent terminal unit directly sends out reclosing command, complete
At entire reclosing process；If downstream feeder line still has voltage, remote mains side intelligent terminal unit also to carry out inspection synchronous operation,
It closes a floodgate after meeting grid-connected conditions.
Further, intelligent terminal unit will also carry out checkout voltage and inspection synchronous operation at the interconnection switch, meet
It closes a floodgate after combined floodgate condition.
Further, in the protection rate-determining steps at the distributed generation resource points of common connection, the public company of distributed generation resource
The intelligent terminal of junction identifies network topology according to the switching information that intelligent terminal unit at feeder line is sent, specially：
All feeder lines, the points of common connection of distributed generation resource itself, interconnection switch are considered as section, each section is compiled in advance
Number, the intelligent terminal unit at each distributed generation resource points of common connection forms one and shows whether this section deposits with other sections
In the adjacency matrix L of connection relation；
The switch that intelligent terminal unit at distributed generation resource points of common connection is connected to the transmission of other intelligent terminal units becomes
After the information of position, the row phasor S of update statement network switching state；
Intelligent terminal unit storage matrix D at distributed generation resource points of common connection, matrix D is row vector, the company of being stored with
The segment number of welding system power supply；
Using the element in S as diagonal entry, square formation S ' is generated, L is multiplied with S ' to obtain matrix R, finds in S " 0 " institute
Row number x, the x row elements in matrix R are set as complete zero, obtain matrix R ', the row in matrix R ' where last row " 1 "
Number represent the section of intelligent terminal unit connection；
The line number where " 1 " in R ' last row is found, and is sequentially stored into row phasor G；
Judge whether the line number found among the above belongs to matrix D, if so, then stopping searching, is formed from system side to distribution
The supply path of formula mains side；If it does not exist, then searching in above-mentioned found row, the row number where another " 1 ", sequence
It is stored in matrix G；
With the line number that the row number found is row to be searched, the row number where " 1 " is found in row to be searched, it is desirable that the row number is not
Be stored in matrix G in matrix G, and by this row number, judge whether the row number belongs to matrix D, if so, then stop searching, formed from
Supply path of the system side to distributed electrical source；If it is not, continuing to search for, it is until the row number where " 1 " belongs to matrix D
Only；
There is whole supply path from system power supply to the intelligent terminal unit in matrix G, any on the route opens
Tripping is closed, this side distributed generation resource is at island state.
Compared with prior art, the beneficial effects of the invention are as follows：
(1) positive sequence fault component current differential protection is utilized, can reflect all types failure in section, accomplish without time limit
Failure is cut off, guard method has absolute selectivity.
(2) non-faulting section service restoration is rapid, can restore electricity for dead electricity region in 1 second, which can be big
It is big to improve distribution network reliability.
(3) presence that distributed generation resource is considered during reclosing uses rational reclosing strategy to reduce combined floodgate pair
The influence that power distribution network is brought.
(4) cooperation and coordination of the program and the anti-isolated island protection of distributed generation resource are fully considered in failover procedure,
Distributed generation resource can be kept to be incorporated into the power networks to greatest extent.
(5) judge whether distributed generation resource is in island state by network topology identification, method of discrimination is simple and reliable.
And the intelligent terminal unit in system can adjust itself function according to current topological structure.
Description of the drawings
The accompanying drawings which form a part of this application are used for providing further understanding of the present application, and the application's shows
Meaning property embodiment and its explanation do not constitute the improper restriction to the application for explaining the application.
Fig. 1 is the active power distribution network illustraton of model containing intelligent terminal unit (Smart Terminal Unit, STU)；
Fig. 2 is the troubleshooting process figure of intelligent terminal unit at feeder line；
Fig. 3 is that the low voltage ride-through capability of photovoltaic plant requires figure；
Fig. 4 is the intelligent terminal list at distributed generation resource points of common connection (Point of Common Coupling, PCC)
Member carries out the overall flow figure that low voltage crossing, the protection of anti-isolated island and topology identify.
Specific implementation mode
It is noted that following detailed description is all illustrative, it is intended to provide further instruction to the application.Unless another
It indicates, all technical and scientific terms used herein has usual with the application person of an ordinary skill in the technical field
The identical meanings of understanding.
It should be noted that term used herein above is merely to describe specific implementation mode, and be not intended to restricted root
According to the illustrative embodiments of the application.As used herein, unless the context clearly indicates otherwise, otherwise singulative
It is also intended to include plural form, additionally, it should be understood that, when in the present specification using term "comprising" and/or " packet
Include " when, indicate existing characteristics, step, operation, device, component and/or combination thereof.
The operation principle of the present invention is that：In active power distribution network, every external area error, no matter whether non-faulting section flows through
Fault current, the electric current flowed across all passing through property, it is contemplated that distribution network line is shorter, and capacitance current is smaller,
Line direction is directed toward as the positive direction of electric current using busbar, and the magnitude of current that can be approximately considered non-faulting section both ends is equal in magnitude, phase
Position is opposite；For troubles inside the sample space, in section downstream in the case of distribution-free formula plant-grid connection, only close to system power supply side bus
Flow through fault current；If there are distributed generation resource, fault section both sides will all flow through fault current in downstream, if both sides power supply
Phase angle difference it is little, the phase that can be approximately considered fault current is close to identical.In summary feature, current differential protection
Principle is suitable for active power distribution network.To avoid bearing using current failure component in view of the load current in power distribution network is larger
The effective means of lotus component adverse effect.For the differential protection using double-ended current information, the information transmitted in network
More fewer, better, such as differential using split-phase, the information content of required transmission is larger, will increase network communication pressure.It is adopted in power distribution network
With three_phase reclosing, it is not necessarily to Fault Phase Selection, distribution protection mainly copes with line to line fault and three-phase shortcircuit, positive sequence or negative sequence component
It can reflect all fault types.Moreover, because of the control strategy multi-track positive-sequence component of current inversion class distributed generation resource,
Only send out forward-order current.Consider, positive sequence fault component current differential protection is best suited for active power distribution network.
It, for convenience, will be with STU acute pyogenic infection of finger tip intelligent terminal units, with DG in a kind of typical embodiment of the application
Distributed generation resource is represented, distributed generation resource points of common connection is represented with PCC.
Distributed feeder line Scheme of Self-healing Control Frame based on STU：Do not represent the breaker at STU in Fig. 1, but with
The color of STU represents the folding condition (black, which represents, to be closed, and white, which represents, to be disconnected) for the breaker that each STU is controlled, and enables STU9
The breaker controlled is interconnection switch.F as shown in Figure 11Place breaks down, short circuit current flow at STU1, the guarantor of STU1
Shield start after, into section to lateral terminal STU2 transmission data request commands, ask it to send the fault current data of itself.
Since short circuit current flow, transient detection element can not start at STU2, in the data request command for receiving opposite end
Afterwards, the positive sequence fault component electric current and fault current amplitudes for being all zero will be sent.STU1 receives the fault current from opposite end
After data, differential judgement will be respectively enterd.In f1In the case of locating failure, the positive sequence fault component current differential protection of STU1 will
Correct action, this side breaker of tripping.And STU1 can judge whether offside starts according to the STU2 fault current data transmitted,
Enter and fail to start, that is, be considered as the sides STU2 and weak feedback occurs, remote control trip signal will be sent by STU1 and gives opposite end STU2, it is ensured that faulty section
The breaker at section both ends all can tripping.As f as shown in Figure 12Place breaks down, and larger short circuit electricity can be provided in DG1 and DG2
Under conditions of stream, STU5 and STU6 can start because detecting jump-value of current.Both ends STU calculates separately the electric current number of local terminal
According to asking and receive opposite end current data, the two can be according to this side circuit breaker trip of itself judging result independent control.
If specifically, f2Place breaks down, and after the breaker tripping that STU5 and STU6 is controlled, the STU5 of nearly mains side prolongs
When for a period of time (such as 600ms) start reclosing operation.STU5 carries out checkout voltage first, it is ensured that remote mains side breaker is separating brake
State then sends out reclosing instruction as not having voltage on circuit.If overlapping to permanent fault, STU5 detects that circuit is secondary
Overcurrent, this side breaker of tripping, no longer carries out reclosing；If overlapping to transient fault, STU5 will not detect overcurrent, true
In the case of protecting Failure elimination, STU5 sends the message of itself successful reclosing to remote mains side STU6.STU6 is connected to opposite end coincidence
After successful message, checkout voltage is carried out first, if the downstreams STU6 DG has dropped out operation, downstream feeder line no-voltage, STU6 can be straight
Sending and receiving go out reclosing instruction, complete entire reclosing process；If downstream feeder line still has voltage, illustrate downstream DG still in networking
State generates larger dash current when grid-connected in order to prevent, STU6 will also carry out inspection synchronous operation, after meeting grid-connected conditions
It closes a floodgate.It is overlapped to permanent fault in nearly STU5, in addition to sending out trip command, the STU9 at interconnection switch will also be sent and closed
Lock instructs.Equally, STU will also carry out checkout voltage and inspection synchronous operation at interconnection switch, close a floodgate after meeting combined floodgate condition, to
Realize non-faulting section service restoration.
Distributed feeder line Scheme of Self-healing Control Frame based on STU, protection decision flowchart are as shown in Figure 2.
First, the block switch at each section both ends is breaker on active power distribution network feeder line, and interconnection switch is distributed
Switch at the points of common connection of power supply and power grid is also configured to breaker, and an intelligent terminal list is installed at each breaker
Member, each terminal unit have independent data processing capacity and can autonomous control breaker actuation, it is logical to have equity between terminal
Letter ability.
(1) the intelligent terminal unit at each feeder breaker is using jump-value of current as starting element, because detecting therefore
Barrier occurs after starting, and intelligent terminal unit calculates this side fault current data, and to another intelligent terminal list of this section
Member sends fault current request of data；
(2) after the fault current request of data for receiving opposite end, the failure that intelligent terminal unit has calculated this side is electric
Flow data is sent to opposite end；
(3) after receiving the fault current data that other side sends, intelligent terminal unit is sentenced using both ends current data
Whether other failure is in this section, if it is, tripping local terminal breaker immediately, is receiving the same of peer failure current data
When, differentiate opposite end weak feedback situation whether occurs, if so, and failure be located in area, then local intelligent terminal unit to opposite end hair
Send tripping control command；
(4) after the breaker of fault section both sides trips, the intelligent terminal unit close to system power supply side is being delayed
Start reclosing operation after a period of time, if successful reclosing, the intelligent terminal unit of remote mains side is notified to overlap, if overlapping not
Success then sends order of closing a floodgate to interconnection switch；
(5) intelligent terminal unit closes interconnection switch after receiving remote control combined floodgate order at interconnection switch, to restore non-event
Hinder block supply.
In step (1)-(2), fault current data refer to utilizing the three-phase of the latter cycle at current break moment
The calculated correlated current data of current data sampled point institute.According to the difference of used protection philosophy, required fault current
Data are also different.
In the step (2), if the transient detection element of intelligent terminal unit is not actuated, asked in the data for receiving opposite end
After asking order, the fault current data for being all zero will be sent to opposite end.
In the step (3), protection philosophy is realized using the current data at section both ends, used protection philosophy can
To be positive sequence fault component current differential protection, the protection of current amplitude comparison expression, full current differential protection etc., select herein just
Sequence fault component current differential protection.
In the step (3), if the small Mr. Yu's setting value of current amplitude that opposite end is sent, may determine that other side
Weak feedback situation, to realize that Fault Isolation, intelligent terminal need to send remote control trip signal to opposite end.
In the step (4), nearly mains side carries out checkout voltage first when starting reclosing operation, if downstream feeder line does not have
There is voltage, then sends out combined floodgate order, close nearly mains side breaker.
In the step (4), remote mains side intelligent terminal is examined first after the message for receiving opposite end closing success
Without pressure, if distributed generation resource has dropped out operation, downstream feeder line no-voltage downstream, remote mains side intelligent terminal can directly be sent out
Reclosing command completes entire reclosing process；If downstream feeder line still has voltage, illustrate downstream distribution formula power supply still in networking
State, generates larger dash current when grid-connected in order to prevent, remote mains side intelligent terminal will also carry out inspection synchronous operation, accord with
It closes a floodgate after closing grid-connected conditions.
In the step (5), intelligent terminal unit will also carry out checkout voltage and inspection synchronous operation at interconnection switch, meet
It closes a floodgate after combined floodgate condition.
In step (3)-(5), if intelligent terminal unit detects the on off state variation of local breaker at feeder line,
The circuit breaker switch state after variation is just sent to the intelligent terminal unit at each distributed generation resource points of common connection.
The overall plan of protection control method at distributed generation resource PCC based on STU：To make the anti-orphan of distributed generation resource
Island protection is matched with low voltage ride-through capability, is set the STU at PCC and is carried out isolated island detection again after completing low voltage crossing,
If during low voltage crossing, voltage curve 1 shown in Fig. 3 at PCC is hereinafter, breaker at tripping PCC；If low-voltage
Success is passed through, then detects whether distributed generation resource is island operation state, if it is, breaker at directly tripping PCC.Specifically
Flow is as shown in Figure 4.
(1) intelligent terminal at distributed generation resource points of common connection is believed according to the switch that intelligent terminal unit at feeder line is sent
Breath identification network topology, is sent to intelligent terminal unit at each feeder line, and whether judge local distributed generation resource by recognition result
In island state；
(2) the intelligent terminal unit at distributed generation resource points of common connection detect proceed by after system jam it is low
Voltage ride-through process, if this ground voltage is less than permissible value, tripping circuit breaker switch exits distributed generation resource operation；
(3) after low voltage crossing success, if local distributed generation resource is still island operation state, tripping points of common connection
Locate breaker, exits distributed generation resource operation.
In the step (1), the intelligent terminal at distributed generation resource points of common connection is identified according to the switching information received
Network topology is as follows：
All feeder lines, the points of common connection of distributed generation resource itself, interconnection switch are considered as section by (1-1), to each section
It numbers in advance, the intelligent terminal unit at each distributed generation resource points of common connection forms one and may indicate that this section and other
Section whether there is the adjacency matrix L of connection relation；
Intelligent terminal unit at (1-2) distributed generation resource points of common connection is connected to the switch changed position letter of other-end transmission
After breath, the row phasor S of update statement network switching state；
Intelligent terminal unit storage matrix D at (1-3) distributed generation resource points of common connection, matrix D is row vector, storage
There is the segment number of connection system power supply.
(1-4) generates square formation S ' using the element in S as diagonal entry, and L is multiplied with S ' to obtain matrix R.It finds in S
X row elements in matrix R are set as complete zero, obtain matrix R ' by the row number x where " 0 ".Last row " 1 " institute in matrix R '
Line number represent the sections of the STU connections；
(1-5) finds the line number where " 1 " in R ' last row, and is sequentially stored into row phasor G；
Whether the line number found in (1-6) judgment step (1-5) belongs to matrix D.If so, then stop searching, formed from being
Supply path of the system side to distributed electrical source；If it does not exist, then in the row that finding step (1-5) is found, another " 1 "
The row number at place, sequence are stored in matrix G；
(1-7) with the line number that the row number that is found in step (1-6) is row to be searched, where finding in row to be searched " 1 "
Row number (it is required that the row number is not in matrix G), and this row number is stored in matrix G, judge whether the row number belongs to matrix D.If so,
Then stop searching, be formed from system side to the supply path of distributed electrical source；If it is not, repeating step (1-7), directly
Until the row number where " 1 " belongs to matrix D.
(1-8) just has whole supply path from system power supply to the DG by inquiry, in matrix G, on the route
Either switch tripping, this side DG are at island state.
Specific topology identification and isolated island detection scheme：
For circuit hand in hand shown in FIG. 1, according to number as shown in the figure, to the STU at STU, PCC at feeder line, with
And the STU at interconnection switch is numbered.For the STU at DG1, defining its adjacency matrix L is：
Wherein, if the m rows n in matrix L is classified as 1, illustrate that section m is adjacent with section n, matrix L represents STU at PCC
With the static topological relationship of other sections.On off state matrix S is defined as a row vector, k-th of number S [k] represents kth area in S
The on off state of section, 1 represents section connection, and 0 represents section disconnection.Under state shown in FIG. 1, on off state matrix S with
Matrix D is respectively：
S=[1 1110 1]
D=[1 3]
Using the element in S as diagonal entry, square formation S ' is generated, L is multiplied with S ' can obtain matrix R：
The row number x where " 0 " is found in S, the x row elements in matrix R are also configured as complete zero, obtain matrix R '：
For matrix R ', two " 1 " of last row represent it and are connected on the section that two are connected to, can be from the row
Any one " 1 " proceeds by topological identification.Such as start from R ' (3,6), specific method is：R ' (3,6) deposits " 3 " in the 3rd row
Enter matrix G, obtain G=[3], since 3 are present in matrix D, then the route for having found supply DG1 is：System power supply-section
3—DG1(STU5-STU6-STU10).Start from R ' (4,6), R ' (3,6) is in the 4th row, and " 4 " are not belonging to matrix D, therefore looks for
To the 3rd row where another " 1 " in the 4th row, since number 3 has occurred in matrix G, so no longer searching.So when
When the connected STU of PCC learn the either switch tripping on DG1 supply paths at DG1, this side DG is at island state.
The protection control flow of STU at PCC：STU at PCC carries network topology identification, the anti-isolated island of distributed generation resource
The vital task of protection and low voltage crossing, after receiving switch changed position information, the STU at PCC judges system jam,
Into low voltage crossing process, during low voltage crossing carries out, if voltage is less than curve 1 shown in Fig. 3 at PCC, jump
The switch at PCC is opened, distributed generation resource operation is exited.After the completion of low voltage crossing, STU is opened up according to current network at PCC
It flutters and judges whether distributed generation resource is in island state, if so, also exiting distributed generation resource operation.
It needs to be latched topological relation update 1.5s after receiving switch change information for the first time, it is former to have done so two aspects
Cause.First, during reclosing, STU at feeder line is to be with the state before failure relative to the distant relationships of system power supply
Benchmark, the maximum time (taking 1.5s herein) for completing reclosing and load transfer in the past, topological relation should be latched.Second,
At PCC STU the maximum islet operation time (generally 1.8s-2s) in the past, be indifferent to whether itself is island state, locking is more
New way can be to ensure program operational efficiency as much as possible.It, will again after reclosing and non-faulting section service restoration
Secondary open topology update is identified with isolated island, and sends topology status to STU at feeder line, to prepare for next failure.
This method of the present invention is made using intelligent terminal unit as optimized integration using positive sequence fault component current differential protection
For protection philosophy, under conditions of on-load switch is breaker, can realize the positioning of distributed fault section, fault section every
From, non-faulting section service restoration.Method has fully considered that the cooperation and coordination with the anti-isolated island protection of distributed generation resource, use are low
Voltage ride-through controls so that distributed generation resource is incorporated into the power networks as far as possible, and each intelligent terminal unit has network topology automatic identification
Function can change protection and control strategy according to the real-time change of network topology.
The foregoing is merely the preferred embodiments of the application, are not intended to limit this application, for the skill of this field
For art personnel, the application can have various modifications and variations.Within the spirit and principles of this application, any made by repair
Change, equivalent replacement, improvement etc., should be included within the protection domain of the application.
Claims (10)
1. a kind of distributed fault self-healing method suitable for active power distribution network, characterized in that including distribution feeder self-healing control
Step processed and the protection rate-determining steps at distributed generation resource points of common connection；
In the distribution feeder self-healing control step, the intelligent terminal unit that is arranged at active power distribution network feeder breaker it
Between peer-to-peer communications, when section breaks down, the intelligent terminal unit at section both ends is judged and is controlled to failure where fault point
The short-circuiting device of guilty culprit section processed trips；
If intelligent terminal unit detects the on off state variation of local breaker at feeder breaker, by the open circuit after variation
Device on off state is sent to the intelligent terminal unit at each distributed generation resource points of common connection, carries out the public company of distributed generation resource
The protection rate-determining steps of junction；
In protection rate-determining steps at the distributed generation resource points of common connection, after receiving switch changed position information, distributed electrical
Intelligent terminal unit judges at the points of common connection of source break down, and into low voltage crossing process, are carried out in low voltage crossing
Period, if voltage is less than setting value at distributed generation resource points of common connection, at tripping distributed generation resource points of common connection
Switch exits distributed generation resource operation, after the completion of low voltage crossing, intelligent terminal unit at distributed generation resource points of common connection
Judge whether distributed generation resource is in island state according to current network topology, if so, also exiting distributed generation resource operation.
2. a kind of distributed fault self-healing method suitable for active power distribution network as described in claim 1, characterized in that described
In distribution feeder self-healing control step, when section breaks down, this in the intelligent terminal unit at section both ends where fault point
When ground intelligent terminal unit detects jump-value of current and starts, local intelligent terminal unit calculates this side fault current data,
And send fault current request of data to the opposite end intelligent terminal unit of this section；
After opposite end intelligent terminal unit receives local fault current request of data, opposite end intelligent terminal unit has counted this side
Good fault current data are sent to local intelligent terminal unit；
After receiving the fault current data that other side sends, local intelligent terminal unit differentiates event using both ends current data
Whether barrier is in this section, if it is, tripping local terminal breaker is sentenced while receiving peer failure current data immediately
Whether other opposite end occurs weak feedback situation, if so, and failure be located in area, then local intelligent terminal unit to opposite end send trip
Control command.
3. a kind of distributed fault self-healing method suitable for active power distribution network as claimed in claim 2, characterized in that described
In distribution feeder self-healing control step, when section breaks down, after at section both ends, breaker trips, fault point location
When detecting jump-value of current in the intelligent terminal unit at section both ends and start, the intelligent terminal unit close to system power supply side
Start reclosing operation after being delayed a period of time, if successful reclosing, the intelligent terminal unit of remote mains side is notified to overlap, if
Unsuccessful reclosing then sends order of closing a floodgate to interconnection switch；
Intelligent terminal unit closes interconnection switch, to restore non-faulting region after receiving remote control combined floodgate order at interconnection switch
Power supply.
4. a kind of distributed fault self-healing method suitable for active power distribution network as claimed in claim 2, characterized in that described
Local intelligent terminal unit calculates this side fault current data, and sends fault current to the opposite end intelligent terminal unit of this section
Fault current data refer to the three-phase current data sampling point institute using the latter cycle at current break moment in request of data
Calculated correlated current data.
5. a kind of distributed fault self-healing method suitable for active power distribution network as claimed in claim 2, characterized in that described
In distribution feeder self-healing control step, when section breaks down, this in the intelligent terminal unit at section both ends where fault point
When ground intelligent terminal unit detects jump-value of current and starts, the transient detection element of opposite end intelligent terminal unit does not open
It is dynamic, after receiving data request command, the fault current data that are all zero will be sent to local intelligent terminal unit.
6. a kind of distributed fault self-healing method suitable for active power distribution network as claimed in claim 2, characterized in that described
Failure protection scheme employed in distribution feeder self-healing control step is positive sequence fault component current differential protection, electric current width
It is worth comparison expression protection or full current differential protection, fault current data should include positive sequence fault component electric current and total current after failure
Amplitude.
7. a kind of distributed fault self-healing method suitable for active power distribution network as claimed in claim 2, characterized in that described
In distribution feeder self-healing control step, if the small Mr. Yu's setting value of current amplitude that opposite end intelligent terminal unit is sent, sentences
Weak feedback situation occurs for disconnected opposite end intelligent terminal unit, to realize that Fault Isolation, local intelligent terminal unit are needed to opposite end intelligence
Terminal unit sends remote control trip signal.
8. a kind of distributed fault self-healing method suitable for active power distribution network as claimed in claim 3, characterized in that close
Mains side intelligent terminal unit carries out checkout voltage first when starting reclosing operation, if downstream feeder line does not have voltage, sends out
It closes a floodgate and orders, close nearly mains side breaker；
Remote mains side intelligent terminal carries out checkout voltage, if being distributed downstream first after the message for receiving opposite end closing success
Formula power supply has dropped out operation, then downstream feeder line no-voltage, and remote mains side intelligent terminal unit directly sends out reclosing command, completes whole
A reclosing process；If downstream feeder line still has voltage, remote mains side intelligent terminal unit also to carry out inspection synchronous operation, accord with
It closes a floodgate after closing grid-connected conditions.
9. a kind of distributed fault self-healing method suitable for active power distribution network as claimed in claim 3, characterized in that described
Intelligent terminal unit will also carry out checkout voltage and inspection synchronous operation at interconnection switch, close a floodgate after meeting combined floodgate condition.
10. a kind of distributed fault self-healing method suitable for active power distribution network as described in claim 1, characterized in that institute
State in the protection rate-determining steps at distributed generation resource points of common connection, the intelligent terminal at distributed generation resource points of common connection according to
The switching information that intelligent terminal unit is sent at feeder line identifies network topology, specially：
All feeder lines, the points of common connection of distributed generation resource itself, interconnection switch are considered as section, each section is numbered in advance,
Intelligent terminal unit at each distributed generation resource points of common connection forms one and shows that this section whether there is with other sections
The adjacency matrix L of connection relation；
Intelligent terminal unit at distributed generation resource points of common connection is connected to the switch changed position letter of other intelligent terminal units transmission
After breath, the row phasor S of update statement network switching state；
Intelligent terminal unit storage matrix D at distributed generation resource points of common connection, matrix D is row vector, is stored with connection system
The segment number of system power supply；
Using the element in S as diagonal entry, square formation S ' is generated, L is multiplied with S ' to obtain matrix R, where finding in S " 0 "
X row elements in matrix R are set as complete zero by row number x, obtain matrix R ', last in matrix R ' arranges the line number generation where " 1 "
The section of table intelligent terminal unit connection；
The line number where " 1 " in R ' last row is found, and is sequentially stored into row phasor G；
Judge whether the line number found among the above belongs to matrix D, if so, then stopping searching, is formed from system side to distributed electrical
The supply path of source；If it does not exist, then searching in above-mentioned found row, the row number where another " 1 ", sequence is stored in
Matrix G；
With the line number that the row number found is row to be searched, the row number where " 1 " is found in row to be searched, it is desirable that the row number is not in square
In battle array G, and this row number is stored in matrix G, judges whether the row number belongs to matrix D, if so, then stopping searching, formed from system
Supply path of the side to distributed electrical source；If it is not, continuing to search for, until the row number where " 1 " belongs to matrix D；
There is whole supply path from system power supply to the intelligent terminal unit in matrix G, the either switch on the route is jumped
It opens, this side distributed generation resource is at island state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810145063.4A CN108400586A (en) | 2018-02-12 | 2018-02-12 | A kind of distributed fault self-healing method suitable for active power distribution network |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810145063.4A CN108400586A (en) | 2018-02-12 | 2018-02-12 | A kind of distributed fault self-healing method suitable for active power distribution network |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108400586A true CN108400586A (en) | 2018-08-14 |
Family
ID=63095965
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810145063.4A Pending CN108400586A (en) | 2018-02-12 | 2018-02-12 | A kind of distributed fault self-healing method suitable for active power distribution network |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108400586A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109193595A (en) * | 2018-10-30 | 2019-01-11 | 国网江苏省电力有限公司苏州供电分公司 | Active power distribution network failure separation method based on current phase comparison |
| CN111293690A (en) * | 2020-03-18 | 2020-06-16 | 石家庄科林云能信息科技有限公司 | Distribution line real-time topology analysis method based on matrix |
| CN112014686A (en) * | 2020-08-14 | 2020-12-01 | 国网河南省电力公司封丘县供电公司 | Low-voltage distribution network fault positioning method based on shortest path of adjacency matrix |
| CN113267702A (en) * | 2021-06-24 | 2021-08-17 | 广东电网有限责任公司 | Method and device for generating test case of power distribution network fault self-healing system |
| CN114362157A (en) * | 2021-12-30 | 2022-04-15 | 广东电网有限责任公司 | Automatic grid-connected and off-grid control method and device for micro-grid |
| CN115579851A (en) * | 2022-11-21 | 2023-01-06 | 南京国电南自电网自动化有限公司 | Active detection type power distribution network fault isolation and self-healing method and system |
| CN116260247A (en) * | 2023-03-02 | 2023-06-13 | 国网湖北省电力有限公司电力科学研究院 | IIDER-containing distribution line self-adaptive reclosing method based on topology identification |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103280894A (en) * | 2013-06-14 | 2013-09-04 | 山东理工大学 | Power distribution network control application network topology automatic identifying method |
| CN103490394A (en) * | 2013-09-30 | 2014-01-01 | 山东大学 | Self-synchronizing positive sequence fault component current differential protection method of active power distribution network |
| CN103944153A (en) * | 2014-04-25 | 2014-07-23 | 湖南大学 | Self-adaption intelligent protection method for power distribution network applied to high-permeability distributed power supply |
| WO2015138468A1 (en) * | 2014-03-10 | 2015-09-17 | Silver Spring Networks, Inc. | Distributed smart grid processing |
-
2018
- 2018-02-12 CN CN201810145063.4A patent/CN108400586A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103280894A (en) * | 2013-06-14 | 2013-09-04 | 山东理工大学 | Power distribution network control application network topology automatic identifying method |
| CN103490394A (en) * | 2013-09-30 | 2014-01-01 | 山东大学 | Self-synchronizing positive sequence fault component current differential protection method of active power distribution network |
| WO2015138468A1 (en) * | 2014-03-10 | 2015-09-17 | Silver Spring Networks, Inc. | Distributed smart grid processing |
| CN103944153A (en) * | 2014-04-25 | 2014-07-23 | 湖南大学 | Self-adaption intelligent protection method for power distribution network applied to high-permeability distributed power supply |
Non-Patent Citations (4)
| Title |
|---|
| 丛伟等: "基于可达性矩阵的智能配电网分区及孤岛辨识方法", 《电力系统自动化》 * |
| 湖南省水利电力勘测设计院: "双电源供电线路的检查线路无电压及检查同期的重合闸", 《小型水电站下册电气二次回路部分》 * |
| 王健: "有源配电网分布式保护方案及装置实现", 《中国优秀硕士学位论文全文数据库工程科技Ⅱ辑》 * |
| 高厚磊等: "有源配电网电流差动保护应用技术探讨", 《电力系统保护与控制》 * |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109193595A (en) * | 2018-10-30 | 2019-01-11 | 国网江苏省电力有限公司苏州供电分公司 | Active power distribution network failure separation method based on current phase comparison |
| CN109193595B (en) * | 2018-10-30 | 2019-08-09 | 国网江苏省电力有限公司苏州供电分公司 | Active power distribution network failure separation method based on current phase comparison |
| CN111293690A (en) * | 2020-03-18 | 2020-06-16 | 石家庄科林云能信息科技有限公司 | Distribution line real-time topology analysis method based on matrix |
| CN111293690B (en) * | 2020-03-18 | 2021-05-04 | 石家庄科林云能信息科技有限公司 | Distribution line real-time topology analysis method based on matrix |
| CN112014686A (en) * | 2020-08-14 | 2020-12-01 | 国网河南省电力公司封丘县供电公司 | Low-voltage distribution network fault positioning method based on shortest path of adjacency matrix |
| CN112014686B (en) * | 2020-08-14 | 2022-07-05 | 国网河南省电力公司封丘县供电公司 | Low-voltage distribution network fault positioning method based on shortest path of adjacency matrix |
| CN113267702A (en) * | 2021-06-24 | 2021-08-17 | 广东电网有限责任公司 | Method and device for generating test case of power distribution network fault self-healing system |
| CN114362157A (en) * | 2021-12-30 | 2022-04-15 | 广东电网有限责任公司 | Automatic grid-connected and off-grid control method and device for micro-grid |
| CN115579851A (en) * | 2022-11-21 | 2023-01-06 | 南京国电南自电网自动化有限公司 | Active detection type power distribution network fault isolation and self-healing method and system |
| CN115579851B (en) * | 2022-11-21 | 2023-03-24 | 南京国电南自电网自动化有限公司 | Active detection type power distribution network fault isolation and self-healing method and system |
| CN116260247A (en) * | 2023-03-02 | 2023-06-13 | 国网湖北省电力有限公司电力科学研究院 | IIDER-containing distribution line self-adaptive reclosing method based on topology identification |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US10923906B2 (en) | Fault switch configuration and clearing method in flexible DC converter station | |
| CN108400586A (en) | A kind of distributed fault self-healing method suitable for active power distribution network | |
| CN109193582B (en) | Intelligent power distribution network area protection control system and control method | |
| Memon et al. | A critical review of AC Microgrid protection issues and available solutions | |
| CN103022993B (en) | Adaptive cascade direction interlocking relaying method based on GOOSE (Generic Object Oriented Substation Event) | |
| CN103490394B (en) | The motor synchronizing positive sequence fault component current differential protection method of active power distribution network | |
| CN105207178B (en) | A kind of based on the DG Distribution Network Failure accessed location and isolated island division methods | |
| CN101917064B (en) | Back-up protection processing method of digital substation transformer based on GOOSE mode | |
| CN105811383A (en) | Novel positive sequence impedance differential protection method of microgrid | |
| CN109659967A (en) | Converter station containing resistive superconducting current limiter and dc circuit breaker and its DC Line Fault processing strategie | |
| US11489365B2 (en) | Non-three-phase fault isolation and restoration systems | |
| CN112421615A (en) | Power distribution station self-healing control method and system based on intelligent breaker action | |
| CN109004631A (en) | A kind of adaptive back-up protection control system of network-based power distribution network and method | |
| CN106684822A (en) | Transformer dead-zone fault protection method and breaker failure protection method | |
| CN107910855B (en) | A kind of connection applied to intelligent substation cuts small power supply device | |
| CN112803376A (en) | Power distribution network protection coordination method after grid connection of photovoltaic power supply | |
| CN109888728A (en) | A kind of stratification guard method | |
| CN113872160A (en) | Distributed power source linkage switching system of power distribution network | |
| JP2014072947A (en) | Detection and removal device of single line-to-ground fault of distribution line | |
| CN105978017A (en) | Method for detection and protection of island with anti-theft and anti-tripping function aiming at large-scale wind power | |
| CN108418193A (en) | The failure service restoration method and system that reclosing is combined with low voltage crossing | |
| Rezaei et al. | State-of-the-Art microgrid power protective relaying and coordination techniques | |
| Lu et al. | Application Topology Configuration of Distributed Feeder Automation Based on IEC 61850 | |
| KR102562667B1 (en) | Fault Section Separation Method of Normally Multi-Connected Distribution L ines and Intelligent Control Apparatus for Circuit Breakers | |
| Olofsson | Transmission line protection performance in presence of power electronic-interfaced devices: Impact and needed countermeasures in the Swedish transmission system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| TA01 | Transfer of patent application right | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20191015 Address after: 271100, 21 West Main Street, Laiwu, Shandong Applicant after: Laiwu Power Supply Company of State Grid Shandong Electric Power Company Applicant after: State Grid Co., Ltd. Address before: 271100, 21 West Main Street, Laiwu, Shandong Applicant before: Laiwu Power Supply Company of State Grid Shandong Electric Power Company Applicant before: State Grid Corporation Applicant before: Shandong University |
|
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20180814 |