CN106786423B - Service restoration method after failure under a kind of movement of power distribution network differential protection - Google Patents
Service restoration method after failure under a kind of movement of power distribution network differential protection Download PDFInfo
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- 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
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Abstract
Service restoration method after failure under a kind of movement of power distribution network differential protection, step are：Fault zone and non-faulting power loss regional analysis based on differential protection action signal；Scope of power outage internal fault moment load equipment current value is calculated according to the fault moment switched-current sampled value freezed；Non-faulting power loss region is turned to form quick service restoration scheme for route searching；Network optimization reconstruct is carried out, the reconfiguration scheme of whole feasibilities is obtained；Trend verification is carried out to network optimization reconfiguration scheme, selects optimal reconfiguration scheme；Removal of load decision operation is carried out to optimal reconfiguration scheme；Recovery operation is powered according to final service restoration scheme.The present invention restores after capable of carrying out failure fast and reliablely, improves power supply reliability.
Description
Technical field
The invention belongs to electric power project engineering field, it is related to a kind of suitable for lower former of intelligent distribution network differential protection movement
Service restoration method after barrier.
Background technique
With the development of intelligent power distribution network technology, realizes the accurate positioning and isolation of failure after distribution network failure, be distribution
Net the inherently required of intelligent self-healing.And Line Current Differential Protection principle is simple, few using electrical quantity, protection scope defines and nothing
Setting value order, quick action, high reliablity step by step are needed, the failure that can adapt to multiterminal power circuit is accurately positioned and is isolated.
It will lead to non-faulting power loss section after Fault Isolation, how to consider the balance of power supply interrupted district load and stand-by power source in electric grid, and
Realizing after distribution network failure that service restoration method is optimal in the case where guaranteeing responsible consumer electric power thus supplied is also our problems faceds.
Therefore, applied current differential protection on the basis of existing distribution primary equipment, and actual demand is combined to realize distribution
The power supply of accurate positioning, Fault Isolation and fast quick-recovery non-faulting region after failure is to realize intelligent distribution network self-healing control,
Shorten the fault outage time, improves the important technical of distribution network reliability.
Summary of the invention
The technical problem to be solved by the present invention is to：Pact when restoring electricity after consideration distribution network failure to non-faulting power failure area
Beam target such as turns for feeder line capacity, power loss load is minimum, loss minimization, switch motion number is minimum and voltage deviation is minimum
Deng.Research meets constraint according to the related datas such as distribution network failure information, network topology, electrical network parameter and historical statistics, building
Under the different reset modes such as the optimal reconfiguration scheme of target and the recovery of power distribution network main plot, partition recovery, load transfer recovery most
Excellent recovery policy.The present invention specifically uses following technical scheme.
Service restoration method after failure under a kind of movement of power distribution network differential protection, it is characterised in that：
By differential protection step switch information and Network topology, analyzes fault zone and lead to non-faulting
Power loss region, and network topology, load estimation, Load flow calculation etc. is combined to carry out network reconfiguration analysis, building meets constrained objective
Optimal reconfiguration scheme and optimal recovery policy.
Service restoration method includes the following steps after the failure：
(1) after the tripping of power distribution network differential protection, according to differential protection action signal, the net of switch changed position signal and power distribution network
Network topological structure carries out fault zone analysis to power distribution network, finds out non-faulting power loss region；
(2) according to current sampling data before power loss switch fault, power loss load equipment fault moment current value is calculated；
(3) non-faulting power loss region is turned to select non-faulting power loss zone boundary that can turn for electric current for route searching
Maximum interconnection switch can turn closure for the maximum interconnection switch of electric current as non-faulting power loss region fast recovery of power supply side
Case；
(4) after carrying out simulated operation to non-faulting power loss region fast recovery of power supply scheme, in the feeder line group that failure occurs
Load flow calculation is carried out in range, if out-of-limit without device current, which makees
Step (7) are gone to for service restoration scheme after final failure；Otherwise, all feasible network weights in non-faulting power loss region are listed
Structure scheme；
(5) trend verification is carried out to the feasible network reconfiguration scheme of whole that step (4) obtains, if there is active block
Reconfiguration scheme then selects wherein optimal active block reconfiguration scheme to go to step as service restoration scheme after final failure
(7), optimal invalid network reconfiguration scheme otherwise, is selected in all invalid network reconfiguration schemes, enters step (6)；
(6) removal of load decision operation is carried out to optimal invalid network reconfiguration scheme and forms service restoration after final failure
Scheme enters step (7)；
(7) recovery operation is powered to non-faulting power loss region according to service restoration scheme after final failure.
The present invention further discloses following optimal technical scheme：
It, will according to the network topology structure of differential protection action signal, switch changed position signal and power distribution network in step (1)
Power distribution network divides several electrical islands, i.e. region：
Wherein, the electrical island with power-supply device is island living, i.e., non-power supply interrupted district；
The electrical island of non-transformer equipment is dead island, including non-faulting power loss region and failure power loss region, wherein：
If the boundary on dead island is differential protection step switch, damned island is failure island, i.e. failure power loss region；If dead
The boundary on island only has a differential protection step switch, and there are also non-differential protection step switch on boundary, then damned island is non-
Failure power loss island, i.e. non-faulting power loss region.
In step (2), power distribution network breaks down, and when differential protection trips, freezes to switch power loss (differential protection movement
Afterwards, cause distribution partial region to have a power failure, power loss switch refers to switch in power supply interrupted district) update of current sampling data, according to therefore
Hinder preceding switch current sampling data and differential protection step switch, power distribution network is reverted into operating status before failure, calculating is out of order
The electric current of moment load equipment.
In step (3), for non-faulting power loss region, that is, non-faulting power loss island, the total load electric current in island is calculated,
Other switches other than island boundaries differential protection step switch are traversed, if there are electricity in other switch opposite sides, then it is assumed that the switch
It is an interconnection switch, and calculates the turning for electric current of interconnection switch opposite side feeder line, selecting one can turns maximum for electric current
Network switch, by being closed the fast recovery of power supply scheme that can turn to form non-faulting power loss island for the maximum interconnection switch of electric current.
In step (4), the fast recovery of power supply program simulation on the non-faulting power loss island that step (3) obtain is executed,
Load flow calculation is carried out within the scope of feeder line group locating for failure, if out-of-limit without device current in calculation of tidal current, this is non-
Failure power loss region fast recovery of power supply scheme is transferred to step (7) as service restoration scheme after final failure；If there is setting
Standby electric current is out-of-limit, then lists non-faulting power loss region and restore electricity all feasible network reconfiguration schemes, wherein feasible network
Reconfiguration scheme not will lead to new power supply interrupted district after referring to network reconfiguration or generate Electromagnetic coupling route, in network reconfiguration scheme not
It can include differential protection step switch.
In step (5), simulation Load flow calculation is successively carried out for all feasible network reconfiguration schemes in step (4)
And the load balancing degrees after the network reconfiguration program simulation executes are calculated, if there is device current is out-of-limit, then by current network weight
Structure solution tab is invalid state, is otherwise denoted as effective status；After the completion of all-network reconfiguration scheme simulates Load flow calculation, it will walk
Suddenly all feasible network reconfiguration schemes that (4) obtain are divided into two groups, and one group is invalid reconfiguration scheme group, and another group is effectively weight
Structure scheme group；If effective reconfiguration scheme group non-empty, selects the maximum network of load balancing degrees in effective reconfiguration scheme group
Reconfiguration scheme is as optimal active block reconfiguration scheme, using optimal active block reconfiguration scheme as supplying after final failure
After electric recovery scheme, it is transferred to step (7)；Otherwise, select load balancing degrees maximum as optimal in invalid reconfiguration scheme group
Invalid network reconfiguration scheme, enter step (6).
In step (6), step (5) analysis result in, to optimal invalid network reconfiguration scheme carry out simulation get rid of it is negative
Lotus operation, after cutting load sequence after the failure formulated in advance successively simulation disconnection load power switch, again to power distribution network
Load flow calculation is carried out, until the out-of-limit stopping of no device current；The load power switch that the operation of removal of load at this time disconnects is recorded, to most
As service restoration scheme after final failure after excellent invalid network reconfiguration scheme simulation removal of load operation, (7) are entered step.
In step (7), recovery is powered to non-faulting power loss region according to service restoration scheme after final failure
Operation.
The beneficial effects of the invention are as follows：
Compared with service restoration algorithm after existing failure, the present invention is in the precondition for guaranteeing power distribution network safe operation constraint
Under, using the fast recovery of power supply of non-faulting power supply interrupted district as target, it can restore after fast and reliable progress failure, improving power supply can
By property.
Detailed description of the invention
Fig. 1 is service restoration method flow schematic diagram after the failure under power distribution network differential protection movement of the invention；
Fig. 2 is the power distribution network wiring illustrated example in the application implementation example；
Fig. 3 is that the electrical island that the application is implemented in example after the movement of power distribution network differential protection divides schematic diagram.
Specific embodiment
Further details of the technical solution of the present invention with reference to the accompanying drawings of the specification.
It is as shown in Fig. 1 service restoration method after the failure under power distribution network differential protection disclosed by the invention movement, institute
Service restoration method includes the following steps after stating failure：
(1) after the tripping of power distribution network differential protection, according to differential protection action signal, the net of switch changed position signal and power distribution network
Network topological structure carries out fault zone analysis to power distribution network, finds out non-faulting power loss region.
If power distribution network is divided according to the network topology structure of differential protection action signal, switch changed position signal and power distribution network
Dry electrical island, i.e. region：
Wherein, the electrical island with power-supply device is island living, i.e., non-power supply interrupted district；
The electrical island of non-transformer equipment is dead island, including non-faulting power loss region and failure power loss region, wherein：
If the boundary on dead island is the switch of differential protection movement, damned island is failure island, i.e. failure power loss region；If
The boundary on dead island only has a differential protection step switch, and boundary there are also non-differential protection step switch, then damned island is
Non-faulting power loss island, i.e. non-faulting power loss region.
(2) according to current sampling data before power loss switch fault, power loss load equipment fault moment current value is calculated.
Power loss switch and power loss load refer respectively to switch and load in dead island.Power distribution network breaks down, differential protection
When tripping, freeze the update to power loss switched-current sampled value, is acted according to failure preceding switch electric current adopted value and differential protection
Power distribution network is reverted to operating status before failure, calculates power supply interrupted district internal loading equipment according to Kirchhoff's law by switch
Fault moment current value.
(3) boundary for being turned to search out non-faulting power loss region for route searching to non-faulting power loss region is got in touch with
Switch selects boundary that can turn turn closure for the maximum interconnection switch of electric current as non-event for the maximum interconnection switch of electric current
Hinder power loss region fast recovery of power supply scheme.
To non-faulting power loss region, that is, non-faulting power loss island, all load equipments failure obtained in step (1) in island
The summation of moment current value, calculates the total load electric current in island, and traverse other than island boundaries differential protection step switch other opens
It closes, if there is electricity in switch opposite side, then it is assumed that be an interconnection switch, and calculate the turning for electric current of interconnection switch opposite side feeder line, choosing
Selecting one can turn turn to form non-faulting mistake for the maximum interconnection switch of electric current by being closed this for the maximum interconnection switch of electric current
The fast recovery of power supply scheme of electric island.
(4) after non-faulting power loss region fast recovery of power supply scheme carries out simulated operation, in the feeder line group model that failure occurs
In enclosing (feeder line group is the known technical term of this field, and a feeder line group is made of the feeder line that interconnection switch links together,
Feeder line group be implement in power distribution network network analysis, Load flow calculation, the applications such as state estimation minimum unit) carry out Load flow calculation and test
Card, if out-of-limit without device current, the non-faulting power loss region fast recovery of power supply scheme after final failure as supplying
Electric recovery scheme is transferred to step (7)；Otherwise, the reconfiguration scheme of all feasibilities in non-faulting region is listed, wherein feasible network
Reconfiguration scheme not will lead to new power supply interrupted district after referring to network reconfiguration or generate Electromagnetic coupling route, in network reconfiguration scheme not
It can include differential protection step switch.
(5) Load flow calculation verification is carried out to the feasible network reconfiguration scheme of whole that step (4) obtains, if there is effective
Network reconfiguration scheme then selects wherein optimal active block reconfiguration scheme to go to as service restoration scheme after final failure
Step (7) otherwise selects optimal invalid network reconfiguration scheme in all invalid network reconfiguration schemes, enters step (6).
To network reconfiguration scheme carry out simulation Load flow calculation and calculate the network reconfiguration program simulation execute after load it is equal
Current network reconfiguration scheme is then labeled as invalid state, is otherwise denoted as effective status by weighing apparatus degree if there is device current is out-of-limit；
After the completion of all-network reconfiguration scheme simulates Load flow calculation, all feasible network reconfiguration schemes that step (4) obtain are divided into
Two groups, one group is invalid reconfiguration scheme group, and another group is effective reconfiguration scheme group；If effective reconfiguration scheme group non-empty,
Select the maximum network reconfiguration scheme of load balancing degrees as optimal active block reconfiguration scheme in effective reconfiguration scheme group, it will
After optimal active block reconfiguration scheme is as service restoration scheme after final failure, it is transferred to step (7)；Otherwise, invalid
It selects load balancing degrees maximum in reconfiguration scheme group as optimal invalid network reconfiguration scheme, enters step (6).
(6) after forming final failure to the optimal invalid reconfiguration scheme progress removal of load decision operation that step (5) obtains
Service restoration scheme enters step (7)；
Removal of load operation is carried out to optimal invalid reconfiguration scheme, i.e., sequentially according to cutting load after the failure formulated in advance,
Successively simulation re-starts Load flow calculation after disconnecting on-load switch, until the out-of-limit stopping of no device current；Record removal of load at this time
The load power switch disconnected is operated, after after the simulation removal of load operation of optimal invalid network reconfiguration scheme as final failure
Service restoration scheme enters step (7)；
(7) recovery operation is powered to non-faulting power loss region according to service restoration scheme after final failure.
Attached drawing 2 is service restoration method example after the failure after a specific differential protection movement, by three substations
That is the looped network of three feeder lines composition of S1, S2, S3.Wherein, CB1, CB2, CB3 be three feeder lines outlet switch, FB1, FB2,
FB3, FB4, FB5 and FB6 are feeder line section switch, and LL1, LL2 are that (switch state is point to feeder line interconnection switch when normal operation
Position), LD1, LD2, LD3, LD4, LD5, LD6, LD7 and LD8 are load equipment.
If Fig. 3 is that failure occurs in section where load LD2, the movement of feeder line section switch FB1 and FB2 differential protection is jumped
Electrical island division result after opening.Wherein, ISL1, ISL4 and ISL5 are active electrical island, and ISL2 is failure island, and ISL3 is non-event
Hinder power loss island.
For attached drawing 2 and example shown in Fig. 3, power after the failure under power distribution network differential protection movement disclosed by the invention
Restoration methods implement step：
(1) assume that failure occurs in the section where load LD2, then feeder line section switch FB1 and the movement of FB2 differential protection
Tripping, on the two switches the corresponding distribution network terminal installed can on send switch FB1, FB2 differential protection action signal and this two
The state of a switch conjugates signal, carries out electrical island division according to these signals and network topology structure, division result is 5
Island, be respectively labeled as ISL1 ..., ISL5, wherein：ISL1, ISL4 and ISL5 are band electric island, and ISL2 is failure island, and ISL3 is
Non-faulting power loss island, as shown in Figure 3.(2) when failure occurs, freeze to update the sampled value of switching current, obtain opening when failure
Current sampling data is closed, simulation restores switch state when failure, i.e. simulation closure feeder line section switch FB1 and FB2, before failure
The current value acquired on feeder line section switch FB1, FB2, FB3, FB4, FB5 and FB6 calculates power loss load according to power supply relationship
The fault moment current value of LD2, LD3, LD4, LD6.
(3) (switch state is not protection to divide it to the interconnection switch on the periphery of traversal non-faulting power loss island (ISL3) at present
Act the switch of tripping), i.e. interconnection switch LL1 and LL2 calculates turning for electric current for interconnection switch ISL4 and ISL5, and selection can
Turn for the maximum interconnection switch of electric current as the closure switch in the fast recovery of power supply scheme of non-faulting power failure island ISL3, here
Be assumed to be LL1 switch turns maximum for electric current, then chooses closure interconnection switch LL1 as fast recovery of power supply scheme.
(4) the interconnection switch LL1 in the fast recovery of power supply scheme obtained to step (3) carries out simulation closure, that is, simulates
Non-faulting power loss island ISL3 is carried out simulating quick service restoration, three substations S1, S2, S3 three feeder lines (CB1,
CB2, CB3 are three corresponding outlet switchs of feeder line) the interior progress Load flow calculation of range；It, should if out-of-limit without device current
Fast recovery of power supply scheme is transferred to step (7) as final operation scheme；If there is device current is out-of-limit, it is assumed that interconnection switch
Feeder line section between LL1 and feeder line section switch FB4 is out-of-limit, then lists all feasible network reconfiguration schemes, all feasible
Network reconfiguration scheme is scheme 1：{ LL2 (conjunction) }, scheme 2：{ LL1 (conjunction), FB4 (dividing), LL2 (conjunction) }, scheme 3：{LL1
(conjunction), FB3 (dividing), LL2 (conjunction) }, scheme 4：{ LL1 (conjunction), FB5 (dividing), LL2 (conjunction) }, scheme 5：LL1 (conjunction), FB6 (dividing),
LL2 (conjunction) }, scheme 6 { LL1 (conjunction) }.
(5) to network reconfiguration scheme all in step (4), i.e. scheme 1 ... ..., scheme 6 three substation S1, S2,
Simulation Load flow calculation is carried out in three feeder lines (CB1, CB2, CB3 are three corresponding outlet switchs of feeder line) range of S3, and is counted
The load balancing degrees of calculation scheme, whether according to having in calculation of tidal current, device current is out-of-limit is divided into two network reconfiguration scheme
Network reconfiguration scheme is set as effective status, belongs to active block reconfiguration scheme by group if out-of-limit without device current
Otherwise group (has device current out-of-limit), then network reconfiguration scheme is set as invalid state, belongs to invalid network reconstruct side
Case group；If there is network reconfiguration scheme in effective scheme group, from wherein selecting a load balancing degrees maximum as optimal
Network reconfiguration scheme, using optimal active block reconfiguration scheme as service restoration scheme after final failure after, be transferred to step
(7)；Otherwise, select load balancing degrees maximum in invalid reconfiguration scheme group as optimal invalid network reconfiguration scheme, into
Enter step (6).It is assumed that not obtaining effective network reconfiguration scheme group, need to select from invalid network reconfiguration scheme group
Optimal invalid network reconfiguration scheme is selected, optimal invalid network reconfiguration scheme is scheme 2：{ LL1 (conjunction), FB4 (dividing), LL2
(conjunction) }, i.e. interconnection switch LL1 closes LL2 and closes a floodgate, and feeder line section switch FB4 separating brake, the program causes interconnection switch LL2 and feeder line
Feeder line section overload between block switch FB6.
(6) removal of load operation is carried out on the basis of the optimal invalid network reconfiguration scheme that step (5) obtains, i.e., to optimal
Invalid network reconfiguration scheme 2：{ LL1 (conjunction), FB4 (dividing), LL2 (conjunction) } carries out removal of load operation.It is urgent according to what is formulated in advance
In the case of removal of load sequence and network structure limitation carry out removal of load operation, it is assumed that formulation removal of load sequence be：LD4,
LD3,LD6；The load of out-of-limit equipment (feeder line section between interconnection switch LL2 and feeder line section switch FB6) institute band is LD3, LD6
And LD7, need to get rid of load LD3 first according to removal of load sequence, load LD3 is got rid of in simulation, and (power supply for disconnecting load LD3 is opened
Close), Load flow calculation is carried out, out-of-limit without device current, removal of load operation stops, and gets rid of to invalid network reconfiguration scheme, that is, scheme 2
(scheme is the operation scheme formed after load operation：{ cutting load LD3, LL1 (conjunction), FB4 (dividing), LL2 (conjunction) }) as final
Service restoration scheme after failure enters step (7).
Service restoration scheme after the final failure (7) obtained according to step (6), i.e. scheme cutting load LD3, LL1 (conjunction),
FB4 (dividing), LL2 (conjunction) } recovery operation is powered to non-faulting power loss island ISL3 (i.e. non-faulting power loss region).
Claims (7)
1. service restoration method after the failure under a kind of power distribution network differential protection movement, it is characterised in that：It powers after the failure
Restoration methods include the following steps：
(1) it after the tripping of power distribution network differential protection, is opened up according to the network of differential protection action signal, switch changed position signal and power distribution network
Structure is flutterred, fault zone analysis is carried out to power distribution network, finds out non-faulting power loss region；
(2) according to the power loss switched-current sampled value before failure, fault moment load equipment current value is calculated；
(3) non-faulting power loss region is turned to select to turn maximum for electric current in non-faulting power loss region for route searching
Interconnection switch can turn closure for the maximum interconnection switch of electric current as non-faulting power loss region fast recovery of power supply scheme；
(4) after carrying out simulated operation to non-faulting power loss region fast recovery of power supply scheme, in the feeder line group range that failure occurs
Interior carry out Load flow calculation, if out-of-limit without device current, the non-faulting power loss region fast recovery of power supply scheme is as most
Service restoration scheme goes to step (7) after whole failure；Otherwise, all feasible network reconfiguration sides in non-faulting power loss region are listed
Case；
(5) trend verification is carried out to the feasible network reconfiguration scheme of whole that step (4) obtains, is reconstructed if there is active block
Scheme then selects wherein optimal active block reconfiguration scheme to enter step (7) as service restoration scheme after final failure,
Otherwise, optimal invalid network reconfiguration scheme is selected in all invalid network reconfiguration schemes, enters step (6)；
(6) removal of load decision operation is carried out to optimal invalid network reconfiguration scheme and forms service restoration scheme after final failure
Enter step (7)；
(7) recovery operation is powered to non-faulting power loss region according to service restoration scheme after final failure.
2. service restoration method after the failure under power distribution network differential protection movement according to claim 1, it is characterised in that：
In step (1), according to the network topology structure of differential protection action signal, switch changed position signal and power distribution network by distribution
Net divides several electrical islands, i.e. region：
Wherein, the electrical island with power-supply device is island living, i.e., non-power supply interrupted district；
The electrical island of non-transformer equipment is dead island, including non-faulting power loss region and failure power loss region, wherein：
If the boundary on dead island is the switch of differential protection movement, damned island is failure island, i.e. failure power loss region；If dead island
Boundary only have a differential protection step switch, and boundary is there are also non-differential protection step switch, then damned island be it is non-therefore
Hinder power loss island, i.e. non-faulting power loss region.
3. service restoration method after the failure under power distribution network differential protection movement according to claim 1, it is characterised in that：
In step (2), power distribution network breaks down, and when differential protection trips, freezes the update to power loss switched-current sampled value,
According to failure preceding switch current sampling data and differential protection step switch, power distribution network is reverted into operating status before failure, is calculated
The electric current of power failure load equipment fault moment out.
4. service restoration method after the failure under power distribution network differential protection movement according to claim 1, it is characterised in that：
In step (3), for non-faulting power loss region, that is, non-faulting power loss island, the total load electric current in island is calculated, is traversed
Other switches other than island boundaries differential protection step switch, if there are electricity in other switch opposite sides, then it is assumed that it is an interconnection switch,
And the turning for electric current of interconnection switch opposite side feeder line is calculated, selecting one can turn to pass through closure for the maximum interconnection switch of electric current
This can turn the fast recovery of power supply scheme that non-faulting power loss island is formed for the maximum interconnection switch of electric current.
5. service restoration method after the failure under power distribution network differential protection movement according to claim 4, it is characterised in that：
In step (4), the fast recovery of power supply program simulation on the non-faulting power loss island that step (3) obtain is executed, in failure
Load flow calculation is carried out within the scope of locating feeder line group, if out-of-limit without device current in calculation of tidal current, the non-faulting
Power loss region fast recovery of power supply scheme is transferred to step (7) as service restoration scheme after final failure；If there is equipment electricity
It flows out-of-limit, then all feasible network reconfiguration schemes in non-faulting power loss region is listed, wherein feasible network reconfiguration scheme refers to
It not will lead to new power supply interrupted district after network reconfiguration or generate Electromagnetic coupling route, cannot include differential guarantor in network reconfiguration scheme
Protect step switch.
6. service restoration method after the failure under the movement of power distribution network differential protection, feature exist according to claim 1 or 5
In：
In step (5), simulation Load flow calculation is successively carried out for all feasible network reconfiguration schemes in step (4) and is counted
The load balancing degrees loaded under the network reconfiguration scheme are calculated, if there is device current is out-of-limit, then by current network reconfiguration scheme mark
It is denoted as invalid state, is otherwise denoted as effective status；After the completion of all-network reconfiguration scheme simulates Load flow calculation, step (4) is obtained
All feasible network reconfiguration schemes obtained are divided into two groups, and one group is invalid reconfiguration scheme group, and another group is effective reconfiguration scheme
Group；If effective reconfiguration scheme group non-empty, selects the maximum network reconfiguration side of load balancing degrees in effective reconfiguration scheme group
Case is as optimal active block reconfiguration scheme, using optimal active block reconfiguration scheme as service restoration after final failure
After scheme, it is transferred to step (7)；Otherwise, select load balancing degrees maximum in invalid reconfiguration scheme group as optimal invalid
Network reconfiguration scheme enters step (6).
7. service restoration method after the failure under power distribution network differential protection movement according to claim 1, it is characterised in that：
In step (6), in step (5) analysis result, simulation removal of load behaviour is carried out to optimal invalid network reconfiguration scheme
Make, after cutting load sequence when the failure formulated in advance successively simulation disconnection load power switch, re-starts tide in failure
Stream calculation, until the out-of-limit stopping of no device current；The load power switch that the operation of removal of load at this time disconnects is recorded, to optimal invalid
As service restoration scheme after final failure after network reconfiguration program simulation removal of load operation, (7) are entered step.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710000603.5A CN106786423B (en) | 2017-01-03 | 2017-01-03 | Service restoration method after failure under a kind of movement of power distribution network differential protection |
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| CN110739688A (en) * | 2019-10-31 | 2020-01-31 | 中国南方电网有限责任公司 | Urban power grid load balancing method based on SCADA big data |
| CN111030058B (en) * | 2019-11-28 | 2023-03-31 | 南京国电南自电网自动化有限公司 | Power distribution network partition protection method based on 5G communication |
| CN111952972B (en) * | 2020-08-19 | 2023-08-01 | 中国能源建设集团湖南省电力设计院有限公司 | Main-auxiliary integrated load transfer method for high-quality power supply service |
| CN113472074A (en) * | 2021-06-18 | 2021-10-01 | 国网浙江省电力有限公司金华供电公司 | Intelligent fault handling method and system for intelligent power grid dispatching control system |
| CN113507116B (en) * | 2021-07-08 | 2022-07-22 | 国网河北省电力有限公司电力科学研究院 | Power distribution network load transfer method, device, equipment and storage medium |
| CN113809738A (en) * | 2021-07-15 | 2021-12-17 | 国网江苏省电力有限公司电力科学研究院 | Distribution network fault self-healing method and device based on main station and terminal protection cooperation |
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