CN106505564A - A kind of medium voltage distribution network based on the anti-band of bus turns to supply method - Google Patents
A kind of medium voltage distribution network based on the anti-band of bus turns to supply method Download PDFInfo
- Publication number
- CN106505564A CN106505564A CN201611100638.8A CN201611100638A CN106505564A CN 106505564 A CN106505564 A CN 106505564A CN 201611100638 A CN201611100638 A CN 201611100638A CN 106505564 A CN106505564 A CN 106505564A
- Authority
- CN
- China
- Prior art keywords
- opposite end
- load
- distribution line
- turning
- transformer
- 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.)
- Granted
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
- H02J3/007—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources
- H02J3/0073—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources for providing alternative feeding paths between load and source when the main path fails, e.g. transformers, busbars
Abstract
The invention belongs to distribution network reliability technical field, more particularly to a kind of medium voltage distribution network based on the anti-band of bus turns to supply method.Including：Every distribution line of combing turn supply opposite end, determine between each distribution line turn supply relation；Calculate the current margin and load margin of every distribution line；Calculate the opened capacity of all main transformer of transformer substation in power distribution network；Select turning solution during certain transformer station's generation full cut-off failure in power distribution network；Every distribution line of failure judgement transformator needs whether the load current of transfer directly can be shifted for opposite end by selected turn completely；Load margin is verified and can open capacity verification.The method is applied to emergency processing when transformer station occurs full cut-off failure, without changing the grid structure of existing power distribution network, fully excavate power distribution network turn supply potentiality, reduce as far as possible and turn for required switch motion number of times, reach and improve power distribution network and turn the purpose for ability.
Description
Technical field
The invention belongs to distribution network reliability technical field, more particularly to a kind of medium voltage distribution network based on the anti-band of bus turn
For method.
Background technology
It is more reasonable that the society's electricity consumption demand for constantly increasing and the power supply reliability requirement for improving constantly promote power distribution network to possess
Grid structure and more scientific turn to supply method.China is in the important stage of power system reform, attaches great importance to power distribution network
Build.Block switch and interconnection switch turn to play important role in power distribution network.Interconnection switch is normally transported in power distribution network
It is off in the case of row, and can passes through to operate block switch and interconnection switch after breaking down, reaches isolation event
Barrier, the effect of transfer load.
Turn the research also comparative maturity for method and network reconfiguration with regard to power distribution network.Existing research is tied from electrical network
Start with terms of structure optimization, to improving the reliability and power supply capacity of power distribution network, but these methods are relatively suitable in Electric Power Network Planning
Period as reference frame, and in power distribution network traffic control, in addition it is also necessary to deeper into research actual turn supply operational approach, answer
The power cut problem brought by failure or maintenance.The widely used method of Utilities Electric Co. is based substantially on experience and is given accordingly at this stage
Operation scheme, possible and non-optimal turning solution；And the scheduling of power department occurrences in human life is frequently, light is by virtue of experience operated, work
Handing-over succession is difficult to, is badly in need of a kind of convenient, clear and definite, more perfect turning to supply method.
Content of the invention
It is an object of the invention to provide a kind of medium voltage distribution network based on the anti-band of bus turns to supply method, the method to be applied to and become
There is emergency processing during full cut-off failure in power station, without changing the grid structure of existing power distribution network, fully excavate turning for power distribution network
For potentiality, reduce as far as possible and turn for required switch motion number of times, reach the purpose for power distribution network turn being improved for ability.
To achieve these goals, the invention provides following technical scheme：
The present invention provides a kind of medium voltage distribution network based on the anti-band of bus and turns to supply method, it is adaptable to certain power transformation in power distribution network
The medium voltage distribution network that stands when there is full cut-off failure turns to supply, and comprises the steps of：
Step one, every distribution line of combing turn supply opposite end, determine between each distribution line turn supply relation；
Step 2, calculates the current margin and load margin of every distribution line；
Step 3, calculates the opened capacity of all main transformer of transformer substation in power distribution network；
Step 4, turning for certain transformer station's generation full cut-off failure in opposite end combing result selection power distribution network according to step one
When turning solution, that is, be selected to need what the load current of transfer shifted to turn every distribution line of failure transformer
For opposite end；
Step 5, turning for opposite end combing result, the peak load of every distribution line of failure transformer according to step one
Electric current and the current margin of the calculated every distribution line of step 2, every distribution line of failure judgement transformator need
Whether the load current of transfer directly can be shifted for opposite end by turning selected in step 4 completely；If failure transformer is every
Bar distribution line needs the load current of transfer directly can be shifted for opposite end completely by described turn, then carry out the school of step 6
Test step；
If every distribution line of failure transformer needs the load current of transfer directly can not supply opposite end by described turn
Shift completely, using the method transfer of the anti-band of the bus load current turned for opposite end, expand the electric current turned for opposite end
Allowance, and update the turning solution in step 4；
Judge described turn after the expansion current margin whether can directly by the failure transformer distribution line for opposite end
The load current of transfer is needed to shift completely；Can directly by the failure transformer for opposite end if expanding turning after current margin
Distribution line is shifted completely to the load current for needing transfer, then carry out the checking procedure of step 6；
Can not be directly by the failure transformer distribution line to needing to turn for opposite end if expanding turning after current margin
The load current of shifting is shifted completely, judges whether to travel through all optional turning solutions；
If having stepped through all optional turning solutions, power distribution network has a power failure, and waits end to be repaired；Otherwise return to step four
Reselect turning solution；
Step 6, verification
Load margin is verified
Verification turns whether all distribution line transfer load electric currents for after exceed its load margin, if distribution line transfer
Load current then proceeds to open capacity verification not less than its load margin；Otherwise, it is determined whether having traveled through all optional
Turning solution, if having stepped through all optional turning solutions, power distribution network has a power failure, and waits end to be repaired；Otherwise return to step
Four reselect turning solution；
Capacity verification can be opened
Verify each non-faulting main transformer after turning to supply proceeds to whether load can open capacity more than which, if not occurring turning
For opposite end main transformer overload situations, it is determined that final turning solution；Otherwise, it is determined whether traveled through all optional turning supplier
Case, if having stepped through all optional turning solutions, power distribution network has a power failure, and waits end to be repaired；Otherwise return to step four is again
Select turning solution.
In the step one, the method combing for carrying out coloring treatment by the distribution line for each bus of transformer station turns for closing
System：In same transformer station, on same section of bus, the color of all distribution lines is different；Any by turn for switch formed turn supply
The distribution line color of relation is different.
In the step 2, current margin and load margin are calculated by equation below：
In formula,
IRRepresent distribution line current margin, A；
I0Represent that distribution line allows current-carrying capacity, A；
IPMaximum load current when representing that distribution line normally runs, A；
PLRRepresent distribution line load margin, kW；
UNThe nominal voltage of expression system, kV.
In the step 3, capacity can be opened and calculated by equation below：
In formula,
PRCapacity, MW can be opened for main transformer of transformer substation；
SNFor main transformer rated capacity, MVA；
RSminFor main transformer minimum capacity-load ratio, kVA/kW during normal operation；
For power factor.
In the step 5, the load current for opposite end is turned using the method transfer of the anti-band of bus, is expanded and is turned for opposite end
Current margin, comprises the following steps that：
Turning corresponding to the failure transformer distribution line is temporarily diverted to this turn of confession for the load current of opposite end right
Other corresponding turns of end are for, on opposite end, supplying the electric current of opposite end abundant to expand turning corresponding to the failure transformer distribution line
Amount.
Compared with prior art, the beneficial effects of the present invention is：
1st, when combing turns for opposite end, distribution line is marked with different colours, is easy to clear and turns to supply relation；
2nd, the characteristics of being not easy failure using substation bus bar, deeply excavate power distribution network turn supply potentiality；
3rd, provide turn can reduce switch motion number of times for method.
Description of the drawings
Fig. 1 is that medium voltage distribution network of the present invention based on the anti-band of bus turns the flow chart for method；
Fig. 2 turns for figure for the grid structure of the embodiment of the present invention.
Specific embodiment
The present invention is further described with reference to embodiment.
In practical situation, the situation that 2 main transformers are installed by transformer station is not only existed, in the heavier region of load, power transformation
Station is likely to install 3 main transformers, and such case is also taken into account by the present invention, and this is seldom related in other researchs.
A kind of medium voltage distribution network based on the anti-band of bus of the present invention turns to supply method, it is adaptable to certain transformer station in power distribution network
Medium voltage distribution network when there is full cut-off failure turns to supply, and the flow chart of methods described is as shown in figure 1, comprise the steps of：
Step one, every distribution line of combing turn supply opposite end, determine between each distribution line turn supply relation.
Turning for actual power distribution network is sufficiently complex for relation, is more intuitively to clear turning for closing between distribution line
System, the present invention turn to supply relation by the method combing that the distribution line for each bus of transformer station carries out coloring treatment, colour principle
For：In same transformer station, on same section of bus, the color of all distribution lines is different；Any by turn for switch formed turn supply
The distribution line color of relation is different.
Step 2, calculates the current margin and load margin of every distribution line, as shown in formula (1).
In formula,
IRRepresent distribution line current margin, A；
I0Represent that distribution line allows current-carrying capacity, A；
IPMaximum load current when representing that distribution line normally runs, A；
PLRRepresent distribution line load margin, kW；
UNThe nominal voltage of expression system, kV.
Step 3, calculates the opened capacity of all main transformer of transformer substation in power distribution network, as shown in formula (2).
In case of a fault, in order to reduce loss of outage, strive for emergency repair time, main transformer of transformer substation can short-time overload fortune
OK, maximum overload rate is 130%.
In formula,
PRCapacity, MW can be opened for main transformer of transformer substation；
SNFor main transformer rated capacity, MVA；
RSminFor main transformer minimum capacity-load ratio, kVA/kW during normal operation；
For power factor.
Step 4, turning for certain transformer station's generation full cut-off failure in opposite end combing result selection power distribution network according to step one
When turning solution, that is, be selected to need what the load current of transfer shifted to turn every distribution line of failure transformer
For opposite end.
Step 5, turning for opposite end combing result, the peak load of every distribution line of failure transformer according to step one
Electric current and the current margin of the calculated every distribution line of step 2, every distribution line of failure judgement transformator need
Whether the load current of transfer directly can be shifted for opposite end by turning selected in step 4 completely.If failure transformer is every
Bar distribution line needs the load current of transfer directly can be shifted for opposite end completely by described turn, then carry out the school of step 6
Test step；
If every distribution line of failure transformer needs the load current of transfer directly can not supply opposite end by described turn
Shift completely, the load current of the confession opposite end is turned using the method transfer of the anti-band of bus, expands the electric current turned for opposite end
Allowance, and update the turning solution in step 4；Comprise the following steps that：
Turning corresponding to the failure transformer distribution line is temporarily diverted to this turn of confession for the load current of opposite end right
Other corresponding turns of end are for, on opposite end, supplying the electric current of opposite end abundant to expand turning corresponding to the failure transformer distribution line
Amount；Update turning solution；
Judge described turn after the expansion current margin whether can directly by the failure transformer distribution line for opposite end
The load current of transfer is needed to shift completely；Can directly by the failure transformer for opposite end if expanding turning after current margin
Distribution line is shifted completely to the load current for needing transfer, then carry out the checking procedure of step 6；
Can not be directly by the failure transformer distribution line to needing to turn for opposite end if expanding turning after current margin
The load current of shifting is shifted completely, judges whether to travel through all optional turning solutions；
If having stepped through all optional turning solutions, power distribution network has a power failure, and waits end to be repaired；Otherwise return to step four
Reselect turning solution.
For example, there are 2 main transformers in failure transformer station；It is low that the load current that cannot be shifted can pass through failure transformer
The connected bus in pressure side is transferred a load onto on other distribution lines, if also load cannot be shifted in time, then these loads
Can only brief power outage, wait end to be repaired.
If failure transformer station is mounted with 3 main transformers, 3 sections of buses in this transformer station, will be had, in this case,
If bus with the load on distribution line can not directly by turn directly shift for opposite end, it is also contemplated that by other 2 sections
Bus is transferred on the distribution line outside step one combing result.
During load transfer is carried out, may multi-pass operation switch, run into and turn not enough for opposite end load margin
Situation, it might even be possible to which the load of original power distribution circuit is first transferred to other distribution lines, is born after vacateing load margin again
Lotus shifts.
Step 6, verification
Load margin is verified
Verification turns whether all distribution line transfer load electric currents for after exceed its load margin, if distribution line transfer
Load current then proceeds to open capacity verification not less than its load margin；Otherwise, it is determined whether having traveled through all optional
Turning solution, if having stepped through all optional turning solutions, power distribution network has a power failure, and waits end to be repaired；Otherwise return to step
Four reselect turning solution.
Capacity verification can be opened
Verify each non-faulting main transformer after turning to supply proceeds to whether load can open capacity more than which, if not occurring turning
For opposite end main transformer overload situations, it is determined that final turning solution；Otherwise, it is determined whether traveled through all optional turning supplier
Case, if having stepped through all optional turning solutions, power distribution network has a power failure, and waits end to be repaired；Otherwise return to step four is again
Select turning solution.
Embodiment
The present embodiment grid structure turns for figure (explanation as shown in Figure 2：In actual power distribution network, every circuit also has many points
Duan Kaiguan, only depicts the interconnection switch turned between reflection circuit for relation in this figure.Wherein, FK353, FK038,2075,
2057 and 2108 numberings for representing interconnection switch).
Embodiment includes four transformer stations, respectively first, second, Bing Heding altogether.Wherein, first, the third, three transformer stations of fourth, per
Seat transformer station configures the main transformer that two capacity are 50MVA, and power factor is 0.98, respectively main transformer TA1、
TA2、TC1、TC2And TD1、TD2, first, the third, the main transformer T of three transformer stations of fourthA1、TC1, and TD1Female with the 1# of respective transformer station
Line is connected, main transformer TA2、TC2And TD2It is connected with the 3# buses of respective transformer station；Transformer station's second is mounted with three main transformer pressures
Device, power factor are 0.98, respectively TB1、TB2And TB3, capacity is 31.5MVA, wherein, TB1It is connected with 1# buses, TB2
It is connected with 3# buses, TB3It is connected with 5# buses.Transformer station's first has four 10kV distribution lines, respectively AL1, AL2, AL3 and
AL4；Wherein, AL1 and AL2 are connected to 1# buses, and AL3 and AL4 is connected to 3# buses；Transformer station's second has eight 10kV distribution wires
Road, respectively BL1, BL2, BL3, BL4, BL5, BL6, BL7 and BL8, wherein BL1, BL2 and BL3 are connected to 1# buses, BL4,
BL5 and BL6 are connected to 3# buses, and BL7 and BL8 is connected to 5# buses；Transformer station third has five 10kV distribution lines, respectively
CL1, CL2, CL3, CL4 and CL5, wherein CL1, CL2 and CL3 are connected to 1# buses, and CL4 and CL5 is connected to 3# buses；Transformer station's fourth
Have five 10kV distribution lines, respectively DL1, DL2, DL3, DL4 and DL5, wherein DL1 and DL2 is connected to 1# buses, DL3,
DL4 and DL5 are connected to 3# buses.The maximum load current of each 10kV distribution lines and permission current-carrying capacity situation are as shown in table 1.
The each 10kV distribution lines load current of 1 embodiment of table and operation current-carrying capacity statistical table
| Distribution line title | Maximum load current/A | Current-carrying capacity/A | Distribution line title | Maximum load current/A | Current-carrying capacity/A |
| AL1 | 271 | 377 | BL8 | 310 | 445 |
| AL2 | 138 | 377 | CL1 | 260 | 423 |
| AL3 | 409 | 377 | CL2 | 90 | 423 |
| AL4 | 175 | 377 | CL3 | 96 | 423 |
| BL1 | 145 | 440 | CL4 | 243 | 423 |
| BL2 | 112 | 440 | CL5 | 226 | 423 |
| BL3 | 75 | 445 | DL1 | 157 | 423 |
| BL4 | 139 | 377 | DL2 | 224 | 423 |
| BL5 | 110 | 377 | DL3 | 238 | 423 |
| BL6 | 61 | 377 | DL4 | 194 | 423 |
| BL7 | 124 | 455 | DL5 | 368 | 445 |
By different 10kV distribution lines according to chromogen then, with different colours mark, as shown in Figure 2.Each according to Fig. 2 combings
10kV distribution lines turn supply opposite end, as shown in table 2.When combing turns for opposite end, a certain bar distribution line warp often occurs
Cross multiple turns and form situations about turning for relation for switch and other distribution lines, but consequently, it is possible to distribution line turn supply relation
Can become very complicated, and hypertelorism turn for opposite end meaning in actual mechanical process also very limited.The present embodiment only considers
Through turning the situation for switch number less than or equal to 2.
2 each 10kV distribution lines of table turn to supply opposite end combing information slip
| Distribution line | Turn to supply opposite end 1 | Turn to supply opposite end 2 | Turn to supply opposite end 3 | Turn to supply opposite end 4 | Turn to supply opposite end 5 | Turn to supply opposite end 6 |
| AL1 | AL2 | AL3 | AL4 | BL4 | BL5 | DL5 |
| AL2 | AL1 | AL3 | AL4 | |||
| AL3 | AL1 | AL2 | AL4 | |||
| AL4 | AL1 | AL2 | AL3 | BL2 | BL3 | |
| BL1 | BL2 | CL2 | ||||
| BL2 | BL1 | BL3 | BL5 | BL6 | CL2 | |
| BL3 | BL2 | BL5 | BL6 | AL4 | ||
| BL4 | BL2 | BL3 | BL5 | AL1 | ||
| BL5 | BL2 | BL3 | BL4 | BL6 | AL1 | |
| BL6 | BL2 | BL3 | BL5 | AL1 | ||
| BL7 | BL8 | CL4 | DL5 | |||
| BL8 | BL7 | DL4 | DL5 | |||
| CL1 | CL3 | CL5 | ||||
| CL2 | BL1 | |||||
| CL3 | CL1 | CL5 | DL2 | |||
| CL4 | BL7 | DL1 | ||||
| CL5 | CL1 | CL3 | DL2 | |||
| DL1 | CL4 | |||||
| DL2 | CL3 | CL5 | ||||
| DL3 | AL1 | DL4 | DL5 | |||
| DL4 | BL8 | DL3 | DL5 | |||
| DL5 | BL7 | BL8 | DL3 | DL4 |
According to current margin and load margin that formula (1) calculates every distribution line, result of calculation is as shown in table 3.Meter
Calculate result to show to have transshipped under AL3 present situation ruuning situations, power supply reliability itself cannot be ensured, therefore cannot function as any
Distribution line turn supply opposite end.
3 each 10kV distribution lines load margin of table
By the opened capacity that formula (2) calculates each main transformer of transformer substation, as a result as shown in table 4.Can by result of calculation
Know main transformer TA2Belong to heavily loaded transformator, it is considered to which, when 130% short-time overload runs, which can open capacity and only have 21.15MW.
4 each main transformer of transformer substation of table can open capacity
| Main transformer title | Capacity/MVA | Minimum capacity-load ratio | Capacity/MW can be opened |
| TA1 | 50 | 1.60 | 32.5 |
| TA2 | 50 | 1.18 | 21.15 |
| TB1 | 31.5 | 1.89 | 23.44 |
| TB2 | 31.5 | 1.72 | 21.86 |
| TB3 | 31.5 | 1.79 | 22.49 |
| TC1 | 50 | 3.19 | 48.05 |
| TC2 | 50 | 3.86 | 50.75 |
| TD1 | 50 | 2.70 | 45.2 |
| TD2 | 50 | 2.95 | 46.75 |
In order to illustrate that the present embodiment course of work, here simulate transformer station's second (interior 3 main transformers of standing) respectively comprehensively
There is the scene of transformer station's full cut-off failure with third (interior 2 main transformers of standing), illustrated with this and turn the idiographic flow for supplying.
Scene one：There is transformer station's full cut-off failure in transformer station's second
Main transformer TB1The 10kV distribution lines of institute's band have BL1, BL2, BL3.This 3 distribution lines is negative as shown in Table 1
Charged current is respectively 145A, 112A, 75A.As shown in Table 2, BL1 turn have a BL2 and CL2 for opposite end, and BL2 in the case without
Method as turn supply opposite end, it is thus possible to turn only have CL2 for opposite end, its current margin be 333A, the distribution line can adopt such as
Lower turning solution：BL1 line outlet choppers are disconnected, and close interconnection switch FK353, and now BL1 is connected in CL2 circuits end
End, can continue to run with；In the same manner, BL2 turns only possible for CL2 for opposite end, closes interconnection switch FK038, now BL2 and CL2
Circuit is connected, and can be continued to run with；BL3 turn for opposite end may be AL4, close interconnection switch 2075 and 2057, now BL3 with
AL4 circuits are connected, and can be continued to run with；Turn to be 333A for the current margin of opposite end CL2；Turn for the current margin of opposite end AL4 be
202A.As can be seen that the load of BL1, BL2, BL3 this 3 distribution lines directly can be shifted for opposite end by its turn completely.
Main transformer TB2The 10kV distribution lines of institute's band have BL4, BL5, BL6.This 3 distribution lines is negative as shown in Table 1
Charged current is respectively 139A, 295A, 61A.As shown in Table 2, BL4 turn have BL2, BL3, BL5 and AL1 for opposite end, and BL2,
BL3, BL5 in the case cannot as turn supply opposite end, it is thus possible to turn only have AL1 for opposite end, its current margin be 106A；
In the same manner, BL5 turns only possible for AL1 for opposite end, and current margin is 106A；BL6 turn for opposite end may be AL1, current margin
For 106A.As can be seen that BL4, BL5 load cannot directly by turning to shift for opposite end；The load of BL6 can directly by turning to supply
Shift completely opposite end.
Main transformer TB3The 10kV distribution lines of institute's band have BL7, BL8.As shown in Table 1, this 2 10kV distribution lines is negative
Charged current is respectively 124A and 310A.As shown in Table 2, BL7 to turn for opposite end to be CL4 or DL5, current margin is respectively
180A and 77A；BL8 turn for opposite end may be DL4 or DL5, current margin be respectively 229A and 77A.As can be seen that BL7 can
So that by turning directly to shift load for opposite end CL4, but BL8 directly cannot be shifted for opposite end by existing turn completely.
Through above analysis, it can be deduced that preliminary conclusion, only with table 1 combing turn cannot transfer load completely for opposite end
Distribution line have：BL4, BL5 and BL8.
Method transfer load electric current using the anti-band of bus.Turning for relation according to Fig. 2, BL4 institutes on-load can be by 2
Secondary turn is gone out for transition of operation, will AL1 distribution lines sub-load be first transferred on AL2 distribution lines, temporarily free up AL1's
Current margins, make it the load for carrying BL4 distribution lines, disconnect BL4 line outlet choppers, close interconnection switch 2108,
The load of BL4 is transferred on AL1 circuits.
Now, institute's on-load of also BL5 and BL8 needs to shift.Although consider that transformer station's second occurs transformer station's full cut-off
Failure, but interior 3 sections of buses of standing still can be with normal work, therefore, by closing bus connection switch, turning for opposite end CL4 using BL7
Carry out based on the anti-band of bus turn supply method, the load of BL8 institutes band also can be shifted completely.Concrete operations are as follows：
1. original for CL4 load is transferred to its turn for opposite end DL1 so as to which load margin is temporarily 423A；
2. by transformer station's second bus connection switch closure, it is equivalent to and distribution line BL5 and BL8 is connected to BL7 as 2 branches
End, on the CL4 that the load on this three distribution lines is simultaneously transferred to released load margin, so can be negative
Lotus shifts completely.
Through verification, after transfer, the load factor of each distribution line is respectively less than 100%, i.e. transfer load and is respectively less than distribution line
Load margin.
Through verification, the load for proceeding to each main transformer can open capacity less than which.
Although load temporarily can be shifted by this turning solution, the mode of connection after turning to supply cannot function as electrical network and transport for a long time
Capable mode, although because turning distribution line and main transformer for after not overlond running, now may and be unsatisfactory for
N-1 safety criterions, now reliability is relatively low to power distribution network in fact.Above-mentioned load transfer method is not unique, power transformation
Three sections of 10kV buses of second of standing have bus connection switch between any two, therefore, in addition to above-mentioned transfer method, it is also contemplated that by which
His bus carries out turning to supply, and as load transfer step is close, here differs and one lists, in order to avoid repeat.
Scene two：There is transformer station's full cut-off failure in transformer station third
Main transformer TC1The distribution line of institute's band has CL1, CL2 and CL3, as shown in Table 1, the load of this 3 distribution lines
Electric current respectively is 260A, 90A and 96A.As shown in Table 2, CL1 turn have a CL3 and CL5 for opposite end, but there is transformer station
During full cut-off failure, the two turn all carry out load transfer for opposite end；CL2 turn have BL1 for opposite end, its load current allowance
For 295A, therefore load directly can be transferred to BL1 by CL2；CL3 turn have CL1, CL5 and DL2 for opposite end, occur transformer station
During full cut-off failure, CL1 and CL5 cannot carry out load transfer, and the load current allowance of DL2 is 199A, therefore the load of CL3 can be straight
Switch through and move to DL2.Main transformer TC2The distribution line of institute's band has CL4 and CL5, as shown in Table 1, the load of this 2 distribution lines
Electric current respectively is 243A and 226A.As shown in Table 2, CL4 turn have BL7 and DL1 for opposite end, their load current nargin
Respectively 331A and 266A, therefore CL4 institutes on-load can directly by turning to be shifted for opposite end completely；CL5 turn have for opposite end
CL1, CL3 and DL2, wherein CL1 and CL3 in this scenario cannot as turning to use for opposite end, and DL2 simultaneously and CL3 turn
For opposite end, its load current allowance is 199A, therefore the load of CL5 cannot also be transferred to DL2.
Through above-mentioned analysis, be obtained preliminary conclusion, CL1 and CL5 only by step one combing turn cannot be by for opposite end
Its on-load is shifted completely.
Using institute's on-load on the method transfer CL1 and CL5 of the anti-band of bus.By operating block switch and interconnection switch,
CL1 sub-loads (load current value is 100A) are transferred to CL3 ends first, now CL1 residues need the load for turning band to be only
160A.By operating bus connection switch, this sub-load can be shifted, concrete steps by turning for opposite end BL7 using CL4 completely
As follows：1. original for BL7 load is transferred to other distribution lines by operating interconnection switch, vacates the load current allowance of BL7；
2. the interconnection switch of CL1 is operated, by the end for needing the load for turning band to be connected to CL4 on CL1；3. Operation switch FK158, by CL1
On sub-load (160A) and CL4 institutes on-load be all transferred to BL7.
After bus connection switch closure, CL5 institutes on-load can be transferred to CL2 ends, in the lump by BL1 as turn will be negative for opposite end
Lotus is shifted.
Through verification, after transfer, the load factor of each distribution line is respectively less than 100%.
Through verification, the load factor of each transformer main change depressor is not less than 130%.
Scene one and scene two are compared, it is found that transformer station third is mounted with 2 main transformers in scene two, in failure
Although can successfully be shifted load by switching manipulation during generation, the method for transfer is relatively fixed, in other words, with scene
In one, transformer station's second is compared, transformer station third with circuit occur transformer station's full cut-off failure when turn for strategy more single.
Claims (5)
1. a kind of medium voltage distribution network based on the anti-band of bus turns to supply method, it is characterised in that：The method suitable for power distribution network certain
Medium voltage distribution network when individual transformer station occurs full cut-off failure turns to supply, and comprises the steps of：
Step one, every distribution line of combing turn supply opposite end, determine between each distribution line turn supply relation；
Step 2, calculates the current margin and load margin of every distribution line；
Step 3, calculates the opened capacity of all main transformer of transformer substation in power distribution network；
Step 4, turning when selecting certain transformer station in power distribution network that full cut-off failure occurs for opposite end combing result according to step one
Turning solution, that is, be selected to be turned what the load current of every distribution line needs transfer of failure transformer shifted for right
End；
Step 5, turning for opposite end combing result, the maximum load current of every distribution line of failure transformer according to step one
And the current margin of the calculated every distribution line of step 2, every distribution line of failure judgement transformator needs to shift
Load current whether directly can be shifted for opposite end completely by turning selected in step 4；If failure transformer is matched somebody with somebody per bar
Electric line needs the load current of transfer directly can be shifted for opposite end completely by described turn, then carry out the verification step of step 6
Suddenly；
If every distribution line of failure transformer needs the load current of transfer directly opposite end can not be supplied complete by described turn
Transfer, using the method transfer of the anti-band of the bus load current turned for opposite end, expands the current margin turned for opposite end,
And update the turning solution in step 4；
Judge described turn after the expansion current margin whether can directly by the failure transformer distribution line needs for opposite end
The load current of transfer is shifted completely；Can directly by the failure transformer distribution for opposite end if expanding turning after current margin
Circuit is shifted completely to the load current for needing transfer, then carry out the checking procedure of step 6；
Can not be directly by the failure transformer distribution line to needing transfer for opposite end if expanding turning after current margin
Load current is shifted completely, judges whether to travel through all optional turning solutions；
If having stepped through all optional turning solutions, power distribution network has a power failure, and waits end to be repaired；Otherwise return to step four is again
Select turning solution；
Step 6, verification
Load margin is verified
Verification turns whether all distribution line transfer load electric currents for after exceed its load margin, if distribution line transfer load
Electric current then proceeds to open capacity verification not less than its load margin；Otherwise, it is determined whether having traveled through all optional turn of confessions
Scheme, if having stepped through all optional turning solutions, power distribution network has a power failure, and waits end to be repaired；Otherwise return to step quadruple
New selection turning solution；
Capacity verification can be opened
Verify each non-faulting main transformer after turning to supply proceeds to whether load can open capacity more than which, if not occurring turning for right
End main transformer overload situations, it is determined that final turning solution；Otherwise, it is determined whether all optional turning solutions have been traveled through, such as
Fruit has stepped through all optional turning solutions, then power distribution network has a power failure, and waits end to be repaired；Otherwise return to step four is reselected and is turned
For scheme.
2. the medium voltage distribution network based on the anti-band of bus according to claim 1 turns to supply method, it is characterised in that：
In the step one, the method combing for carrying out coloring treatment by the distribution line for each bus of transformer station turns to supply relation：
In same transformer station, on same section of bus, the color of all distribution lines is different；Any by turn for switch formed turn supply relation
Distribution line color different.
3. the medium voltage distribution network based on the anti-band of bus according to claim 1 turns to supply method, it is characterised in that：
In the step 2, current margin and load margin are calculated by equation below：
In formula,
IRRepresent distribution line current margin, A；
I0Represent that distribution line allows current-carrying capacity, A；
IPMaximum load current when representing that distribution line normally runs, A；
PLRRepresent distribution line load margin, kW；
UNThe nominal voltage of expression system, kV.
4. the medium voltage distribution network based on the anti-band of bus according to claim 1 turns to supply method, it is characterised in that：
In the step 3, capacity can be opened and calculated by equation below：
In formula,
PRCapacity, MW can be opened for main transformer of transformer substation；
SNFor main transformer rated capacity, MVA；
RSminFor main transformer minimum capacity-load ratio, kVA/kW during normal operation；
For power factor.
5. the medium voltage distribution network based on the anti-band of bus according to claim 1 turns to supply method, it is characterised in that：
In the step 5, the load current for opposite end is turned using the method transfer of the anti-band of bus, expands the electric current turned for opposite end
Allowance, comprises the following steps that：
Turning corresponding to the failure transformer distribution line is temporarily diverted to this turn for the load current of opposite end and supplies opposite end institute
Other turns corresponding are supplied on opposite end, to expand the current margin turned for opposite end corresponding to the failure transformer distribution line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611100638.8A CN106505564B (en) | 2016-12-02 | 2016-12-02 | A kind of medium voltage distribution network based on the anti-band of bus turns for method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611100638.8A CN106505564B (en) | 2016-12-02 | 2016-12-02 | A kind of medium voltage distribution network based on the anti-band of bus turns for method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106505564A true CN106505564A (en) | 2017-03-15 |
| CN106505564B CN106505564B (en) | 2018-12-14 |
Family
ID=58329245
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611100638.8A Expired - Fee Related CN106505564B (en) | 2016-12-02 | 2016-12-02 | A kind of medium voltage distribution network based on the anti-band of bus turns for method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106505564B (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108154310A (en) * | 2017-12-29 | 2018-06-12 | 国网北京市电力公司 | load transfer method, device, storage medium and processor |
| CN108462210A (en) * | 2018-04-26 | 2018-08-28 | 杭州国电电力科技发展有限公司 | Photovoltaic based on data mining can open the computational methods of capacity |
| CN109802486A (en) * | 2019-03-15 | 2019-05-24 | 广东电网有限责任公司 | A kind of power distribution network low pressure quickly turns power supply unit and connection method |
| CN110212539A (en) * | 2019-05-27 | 2019-09-06 | 上海工程技术大学 | A kind of load transfer method and device improving distribution network reliability |
| CN110865255A (en) * | 2019-11-21 | 2020-03-06 | 国网北京市电力公司 | 10kV power distribution network line reversing method |
| CN111313402A (en) * | 2020-02-24 | 2020-06-19 | 国网浙江省电力有限公司湖州供电公司 | N-1 transfer method and system for power distribution network |
| CN111835000A (en) * | 2020-06-19 | 2020-10-27 | 国网湖北省电力有限公司武汉供电公司 | Transformer substation load transfer method and device based on full-control type AC/DC/AC converter |
| CN112736925A (en) * | 2020-12-11 | 2021-04-30 | 国网浙江省电力有限公司宁波市北仑区供电公司 | Distribution network operation mode optimization method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0777489B2 (en) * | 1988-03-15 | 1995-08-16 | 株式会社日立製作所 | Distribution line load accommodation method |
| CN102522747A (en) * | 2011-12-26 | 2012-06-27 | 天津大学 | Calculation method of power supply capability of power distribution system |
| CN105071395A (en) * | 2015-07-29 | 2015-11-18 | 四川大学 | High-voltage distribution network load transfer method based on power supply path logic search |
-
2016
- 2016-12-02 CN CN201611100638.8A patent/CN106505564B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0777489B2 (en) * | 1988-03-15 | 1995-08-16 | 株式会社日立製作所 | Distribution line load accommodation method |
| CN102522747A (en) * | 2011-12-26 | 2012-06-27 | 天津大学 | Calculation method of power supply capability of power distribution system |
| CN105071395A (en) * | 2015-07-29 | 2015-11-18 | 四川大学 | High-voltage distribution network load transfer method based on power supply path logic search |
Non-Patent Citations (2)
| Title |
|---|
| 张李明 等: "计及分布式电源转供能力的配电网供电能力计算", 《现代电力》 * |
| 朱雪飞 等: "基于N-1准则的中压配电线转供能力实用测算分析", 《电力建设》 * |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108154310A (en) * | 2017-12-29 | 2018-06-12 | 国网北京市电力公司 | load transfer method, device, storage medium and processor |
| CN108462210A (en) * | 2018-04-26 | 2018-08-28 | 杭州国电电力科技发展有限公司 | Photovoltaic based on data mining can open the computational methods of capacity |
| CN109802486A (en) * | 2019-03-15 | 2019-05-24 | 广东电网有限责任公司 | A kind of power distribution network low pressure quickly turns power supply unit and connection method |
| CN110212539A (en) * | 2019-05-27 | 2019-09-06 | 上海工程技术大学 | A kind of load transfer method and device improving distribution network reliability |
| CN110865255A (en) * | 2019-11-21 | 2020-03-06 | 国网北京市电力公司 | 10kV power distribution network line reversing method |
| CN110865255B (en) * | 2019-11-21 | 2021-10-22 | 国网北京市电力公司 | 10kV power distribution network line reversing method |
| CN111313402A (en) * | 2020-02-24 | 2020-06-19 | 国网浙江省电力有限公司湖州供电公司 | N-1 transfer method and system for power distribution network |
| CN111313402B (en) * | 2020-02-24 | 2022-03-29 | 国网浙江省电力有限公司湖州供电公司 | N-1 transfer method and system for power distribution network |
| CN111835000A (en) * | 2020-06-19 | 2020-10-27 | 国网湖北省电力有限公司武汉供电公司 | Transformer substation load transfer method and device based on full-control type AC/DC/AC converter |
| CN111835000B (en) * | 2020-06-19 | 2022-03-29 | 国网湖北省电力有限公司武汉供电公司 | Transformer substation load transfer method and device based on full-control type AC/DC/AC converter |
| CN112736925A (en) * | 2020-12-11 | 2021-04-30 | 国网浙江省电力有限公司宁波市北仑区供电公司 | Distribution network operation mode optimization method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106505564B (en) | 2018-12-14 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106505564A (en) | A kind of medium voltage distribution network based on the anti-band of bus turns to supply method | |
| Cipcigan et al. | Investigation of the reverse power flow requirements of high penetrations of small-scale embedded generation | |
| Pereira et al. | A multiobjective optimization technique to develop protection systems of distribution networks with distributed generation | |
| CN105375465A (en) | City center area power distribution network and load transfer method | |
| Lin | Distribution network reconfiguration for load balancing with a coloured Petri net algorithm | |
| CN109787224A (en) | Method for generating regional power grid load transfer strategy for preventing cascading overload | |
| CN109768544B (en) | Regional power grid load transfer method | |
| CN110277771B (en) | Method for improving short-circuit current breaking capacity of transformer substation in T connection mode | |
| CN108879698A (en) | A kind of medium voltage distribution network dual ring topology structure comprising four port flexible switch | |
| CN108011360A (en) | Double loop round and round quickly unlinks method | |
| CN111917115B (en) | Automatic supply transfer scheme compiling method for distribution network self-service power failure plan balance | |
| Sekhavatmanesh et al. | Service restoration in DG-integrated distribution networks using an exact convex OPF model | |
| CN114665472A (en) | Power supply line fault transfer method, line, system, device and storage medium | |
| CN107565547A (en) | A kind of power distribution network operation reliability evaluation and optimization system | |
| Wu et al. | Reliability assessment of AC/DC hybrid distribution network based on sequential monte carlo method | |
| CN108736480A (en) | A kind of multichannel AC looped network type energy router | |
| CN111413534B (en) | Method for estimating low-voltage side current of main transformer when high-voltage side single-phase grounding | |
| CN113258579A (en) | Electrified railway short-circuit current calculation method of hybrid power supply mode bilateral power supply system | |
| CN105140910A (en) | Power restoration method for power distribution station after complete shutdown | |
| CN106300347A (en) | A kind of engineer applied method that can quickly determine 10kV distribution line cyclization tune electricity feasibility | |
| CN108242806B (en) | Feeder automation switch distribution method and system | |
| Macedo et al. | Optimal restoration of distribution networks through reconfiguration and microgrid formation | |
| CN106558874A (en) | A kind of transformer station's reliability comprehensive estimation method towards management and running | |
| Chen et al. | A coordinated strategy of protection and control based on wide-area information for distribution network with the DG | |
| Myint | Analysis of loss reduction for radial distribution system using network reconfiguration |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20181214 Termination date: 20201202 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |