CN110212539A - A kind of load transfer method and device improving distribution network reliability - Google Patents
A kind of load transfer method and device improving distribution network reliability Download PDFInfo
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/007—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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/04—Circuit arrangements for ac mains or ac distribution networks for connecting networks of the same frequency but supplied from different sources
- H02J3/06—Controlling transfer of power between connected networks; Controlling sharing of load between connected networks
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Abstract
The present invention relates to a kind of load transfer method and devices for improving distribution network reliability, the described method comprises the following steps: obtaining substation fault signal in real time；It acquisition failure substation and can turn the load data for substation, the failure substation and can turn for being provided with interconnection switch between substation；Building turns for constraint condition, including can turn to constrain for the constraint of substation's total load, interconnector maximum instantaneous load factor and turn to maximize for load to constrain；Based on the load data, is obtained using trial-and-error method and meet the Optimal Load turning solution turned for constraint condition.Compared with prior art, the present invention has many advantages, such as to improve power supply reliability to greatest extent.
Description
Technical field
The present invention relates to power grid power supply technique fields, are related to a kind of load transfer method, match more particularly, to a kind of raising
The load transfer method and device of electric network reliability.
Background technique
With the development and social progress of social economy, living standards of the people are constantly improved, at the same time people couple
The requirement of Utilities Electric Co. be not confined to power supply volume increase above, also can timely restore electricity and be proposed more after the failure
High requirement.And generic failure can just power to load after having a power failure after fault restoration, and the comfort of people can in this way reduced,
The unstability of society is increased simultaneously.Such as: these places such as government, hospital are that first order load does not allow that power failure thing occurs
Therefore it will cause great property loss as power outage occurs.However be actually unable in and guarantee 100% reliably working of element, it is
The generation for avoiding power outage, sufficiently carry out power failure prediction scheme.
Summary of the invention
It is an object of the present invention to overcome the above-mentioned drawbacks of the prior art and provide a kind of raising power distribution networks can
By the load transfer method and device of property.
The purpose of the present invention can be achieved through the following technical solutions:
A kind of load transfer method improving distribution network reliability, comprising the following steps:
Substation fault signal is obtained in real time；
It acquisition failure substation and can turn the load data for substation, the failure substation and can turn between substation
It is provided with interconnector；
Building turns for constraint condition, including can turn for the constraint of substation's total load, interconnector maximum instantaneous load factor about
Beam is maximized for load with turn and is constrained；
Based on the load data, is obtained using trial-and-error method and turn to turn supplier for the Optimal Load of constraint condition described in meeting
Case.
Further, described specific using described turn of the trial-and-error method acquisition satisfaction Optimal Load turning solution for constraint condition
Include:
1) it according to the load data of the failure substation, obtains wait go to the load point that can turn to be powered for substation
Set；
2) several load points in the load point set are cut off by a setting ratio, remaining load point access can turn to supply
Substation is turned for calculating, and whether system mode meets described turn for constraint condition, if so, record is at this time at this time for judgement
Turning solution reduces the setting ratio, return step 2), if it is not, thening follow the steps 3)；
3) turning solution recorded is judged whether there is, if so, turning supplier using the turning solution as Optimal Load
Case, if it is not, then increasing the setting ratio, return step 2).
It is further, described to turn for substation's total load constraint representation are as follows:
In formula: PiIndicate the load for needing to turn to wait turning to supply for region load point i；N is the total load point wait turn to supply；PjIt indicates
It can turn the load for substation region load point j；M is that can turn for substation region total load point；PBFor that can turn to supply
Substation's group becomes specified useful work power margin.
Further, the interconnector maximum instantaneous load factor constraint representation are as follows:
In formula: PiIndicate the load for needing to turn to wait turning to supply for region load point i；N is the total load point wait turn to supply；Pl% table
Show interconnector maximum instantaneous load factor, PlFor interconnector maximum rated load；P1% be do not turn for when interconnector load
Rate.
Further, using Newton-Laphson method to can turn for substation topological structure carry out Load flow calculation, obtain
Do not turn for when and the interconnection that is connected directly of interconnection switch load at this time, and then obtain do not turn for when interconnector load factor.
The present invention also provides a kind of load transfer devices for improving distribution network reliability, comprising:
Starting module, for obtaining substation fault signal in real time；
Data acquisition module, for acquiring failure substation and the load data for substation, the failure power transformation can be turned
It stands and can turn for being provided with interconnection switch between substation；
Constraint condition constructs module, turns for constructing for constraint condition, including can turn for the constraint of substation's total load, contact
Route maximum instantaneous load factor constrains and turns to maximize for load and constrains；
Output module is obtained using trial-and-error method for being based on the load data and meets described turn for constraint condition most
Excellent load transfer scheme.
Further, the output module includes:
Set record unit, for the load data according to the failure substation, obtaining can turn wait go to for substation
The load point set being powered；
Load cuts off unit, remaining for cutting off several load points in the load point set by a setting ratio
Load point access can turn to obtain corresponding turning solution for substation；
Turn for computing unit, is turned the judgement for calculating for cutting off the turning solution that unit obtains according to the load
Whether system mode meets described turn for constraint condition at this time, if so, generating judging result signal, while record turns to supply at this time
Scheme, if it is not, then only directly generating judging result signal；
Load cuts off adjustment unit, for exporting Optimal Load turning solution according to the judging result signal, and adjusts
Setting ratio adjusted is transmitted to the load and cuts off unit by the setting ratio.
The present invention also provides a kind of load transfer device for improving distribution network reliability, including memory and processor, institutes
It states memory and is stored with computer program, the step of processor calls the computer program to execute the above method.
Compared with prior art, the present invention have with following the utility model has the advantages that
1, the present invention is turned to be forced to have a power failure by interconnector for design using interconnector present in power distribution network
The load in region is transferred in other normal power supply routes, to reduce unnecessary loss, improve power supply quality, makes net
Network is in an optimal operating state to meet the needs of people.
2, the present invention can allow in the event of a failure is forced power supply interrupted district by transfer load fast recovery of power supply, improves system
The power supply reliability of system；The property loss generated by power failure is reduced, the comfort level of people is improved.
3, the present invention, which considers, turns the group varying capacity restricted problem after supplying；It can be in the case where group becomes overload after turning to supply
Cut-out load point, to guarantee that forced outage load point intermediate point normally restores electricity；Consider original contact
The capacity-constrained of route can happen to avoid circuit overload, improve the service life of route；Consider group capacity become
Constraint, ensure that substation after turning to supply can nonoverload operation, while reducing the maintenance cost in power station.
4, the present invention considers the flow situations of original interconnector, simulates true situation to greatest extent.
5, when the present invention considers transfer load, interconnector turns momentary load rate when load；It is instantaneous during turning to supply
Load factor is greater than the maximum load factor that interconnector can bear, then can be met the requirements with cut-out load.
6, the present invention obtains the Optimal Load turning solution for meeting and turning for constraint condition using trial-and-error method, improves to greatest extent
Power supply reliability, convenient and reliable, precision is high.
Detailed description of the invention
Fig. 1 is flow diagram of the invention；
Fig. 2 is substation's direct-furnish terminal switch station used in the embodiment of the present invention (terminal K-type station) (14 times) wiring signal
Figure.
Specific embodiment
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.The present embodiment is with technical solution of the present invention
Premised on implemented, the detailed implementation method and specific operation process are given, but protection scope of the present invention is not limited to
Following embodiments.
Embodiment 1
As shown in Figure 1, the present embodiment provides a kind of load transfer method for improving distribution network reliability, including following step
It is rapid:
Step S1 obtains substation fault signal in real time.
Step S2, acquisition failure substation and can turn the load data for substation, the failure substation with can turn to supply
Interconnection switch is provided between substation, failure substation is denoted as substation A, can turn to be denoted as substation B for substation.
Step S3, using Newton-Laphson method to can turn for substation topological structure carry out Load flow calculation, can facilitate
Obtain virtual value, obtain do not turn for when and the interconnection that is connected directly of interconnection switch load at this time, and then obtain do not turn for when connection
Winding thread road load factor, this load factor is added to turn to supply after in interconnector momentary load rate to calculate interconnector maximum instantaneous
Load factor.
Load transfer constraint condition is constructed, is obtained using trial-and-error method and turns to turn for the Optimal Load of constraint condition described in meeting to supply
Scheme.Objective result is: in the case where meeting constraint condition, more loads are utmostly shifted, it is whole to improve system
The power supply reliability of body.
Turning for this method building includes that can turn negative for the constraint of substation's total load, interconnector maximum instantaneous for constraint condition
The constraint of load rate turns to maximize constraint for load and can turn to become the constraint of active power utilization rate for substation's group.
1. after failure, the total load for needing to turn to be supplied on substation B is constrained；
In formula: PiIndicate the load for needing to turn to wait turning to supply for region load point i；N is the total load point for turning to supply；PjIt indicates to become
The load of power station B institute region load point j；M is substation B institute region total load point；PBBecome specified useful for substation's B group
Function power maximum nargin,Become institute's on-load total amount before not occurring to turn to supply for substation's B group.
The active power utilization rate constraint substitution that substation's B group becomes total can also be used in the constraint:
In formula: PB% substation B group becomes total active power utilization rate.
2. interconnector maximum instantaneous load factor constrains；
In formula: Pl% indicates interconnector maximum instantaneous load factor, PlFor interconnector maximum rated load；Pt% is not
Interconnector load factor before turning to supply.
It is constrained 3. turning to maximize for load.
When substation A breaks down, the load point of forced outage due to failure influences is judged, it can be extensive by substation B
The load point powered again be recorded in set { C }.
Step S4 cuts off several load points in the load point set, remaining load point access by a setting ratio
It can turn to be turned for substation for calculating.
Initial setting ratio according to substation's B group become residual capacity intoSetting.
Step S5, judgement at this time system mode whether meet it is described turn for constraint condition, judgement at this time system mode whether
Meet it is described turn for constraint condition, if so, record turning solution at this time, reduce the setting ratio, return step S4, if
It is no, then follow the steps S6.
Step S6 judges whether there is the turning solution recorded, if so, being turned using the turning solution as Optimal Load
For scheme, if it is not, the setting ratio is then increased, return step S4.
With Fig. 2 10KV typical case's rack wiring { substation's direct-furnish terminal switch station (terminal K-type station) (14 times) wiring signal
Figure } for, it is emulated by MATLAB-GUI, elaborates the content of present invention.(data source used in the present embodiment is in state's net
The Shanghai Electric Power academy of sciences)
(1) as illustrated in fig. 2, it is assumed that fault point occurs in feeder line section 1, then 1 on-load whole forced outage of substation, this
When this sub-load can only be restored electricity by interconnection by substation 2, set { C }=[Lp1, Lp2, Lp3, Lp4, Lp5,
Lp6, Lp7].
(2) set the average load of each load point as 7MW, using master slave servo control calculating do not turn for when each load point
Reliability index, the results are shown in Table 1, and the reliability index of system is as shown in table 2.
1 load point reliability index of table
| Load point | λ | R | U |
| 1 | 0.03474 | 11.3579 | 0.3946 |
| 2 | 0.03474 | 10.7696 | 0.3741 |
| 3 | 0.03474 | 10.1814 | 0.3537 |
| 4 | 0.03474 | 9.5931 | 0.3333 |
| 5 | 0.03474 | 9.0049 | 0.3128 |
| 6 | 0.03474 | 8.4166 | 0.2924 |
| 7 | 0.03474 | 9.0049 | 0.3128 |
| 8 | 0.03474 | 8.1757 | 0.2840 |
| 9 | 0.03474 | 8.1757 | 0.2840 |
| 10 | 0.03474 | 8.7640 | 0.3045 |
| 11 | 0.03474 | 9.3522 | 0.3249 |
| 12 | 0.03474 | 9.9405 | 0.3453 |
| 13 | 0.03474 | 10.5287 | 0.3658 |
| 14 | 0.03474 | 11.1170 | 0.3862 |
2 Reliability Index of table
| SAIFI | SAIDI | CAIDI | ASAI | EENS |
| 0.03474 | 0.33346 | 9.5987 | 0.99996193 | 32.6791 |
(3) by Newton-Laphson method calculate substation 2 do not turn for when interconnector trend and record load at this time
Rate facilitates subsequent superposition calculation.
(4) substantially judge the number of excision load: because spare group becomes 80MW, group change institute's on-load is 7*7=49MW, institute
Become residual capacity 31MW with group.The instantaneous load that interconnector allows is 30MW, can substantially be assumed to cut off load by above-mentioned data
Point is Lp2, Lp3, based on above-mentioned all parameter inputs, using load transfer method of the invention, calculate turn to supply as a result, this
When total load already exceed group the capacity-constrained become, the interconnector momentary load rate after being superimposed alreadys exceed maximum load rate
Constraint, so this time turning to need to increase the load point of excision for failure.
(5) increase excision load point Lp6 on the basis of the above.By simulation calculation it is found that the group of substation 2 becomes negative at this time
Load rate and superimposed interconnector momentary load rate illustrate this time to turn for success all not above constraint condition, and are meeting about
Optimal turning solution under the conditions of beam.
Embodiment 2
The present embodiment provides a kind of load transfer device for improving distribution network reliability, which can be realized such as embodiment 1
The method, including starting module, data acquisition module, constraint condition building module and output module, wherein starting module
For obtaining substation fault signal in real time；Data acquisition module is for acquiring failure substation and can turn the load for substation
Data, the failure substation and can turn for being provided with interconnection switch between substation；Constraint condition constructs module and turns for constructing
For constraint condition, including it can turn for the constraint of substation's total load, the constraint of interconnector maximum instantaneous load factor and can turn for power transformation
Group of standing becomes the constraint of active power utilization rate；Output module is used to be based on the load data, met using trial-and-error method described in
Turn the Optimal Load turning solution for constraint condition.
The output module includes:
Set record unit, for the load data according to the failure substation, obtaining can turn wait go to for substation
The load point set being powered；
Load cuts off unit, remaining for cutting off several load points in the load point set by a setting ratio
Load point access can turn to obtain corresponding turning solution for substation；
Turn for computing unit, is turned the judgement for calculating for cutting off the turning solution that unit obtains according to the load
Whether system mode meets described turn for constraint condition at this time, if so, generating judging result signal, while record turns to supply at this time
Scheme, if it is not, then only directly generating judging result signal；
Load cuts off adjustment unit, for exporting Optimal Load turning solution according to the judging result signal, and adjusts
Setting ratio adjusted is transmitted to the load and cuts off unit by the setting ratio.
Above-mentioned load cuts off adjustment unit specific work process are as follows: when the judging result signal received, which is, is, reduces
The setting ratio；When the judging result signal received is no, the turning solution recorded is judged whether there is, if so,
It is then exported using the turning solution as Optimal Load turning solution, if it is not, then increasing the setting ratio.
The load excision unit of output module turns to cut off adjustment unit cycle operation for computing unit, load, until obtaining
Optimal Load turning solution.
Embodiment 3
The present embodiment provides a kind of load transfer device for improving distribution network reliability, including memory and processor, institutes
It states memory and is stored with computer program, the processor calls the computer program to execute method as described in Example 1
Step.
The preferred embodiment of the present invention has been described in detail above.It should be appreciated that those skilled in the art without
It needs creative work according to the present invention can conceive and makes many modifications and variations.Therefore, all technologies in the art
Personnel are available by logical analysis, reasoning, or a limited experiment on the basis of existing technology under this invention's idea
Technical solution, all should be within the scope of protection determined by the claims.
Claims (8)
1. a kind of load transfer method for improving distribution network reliability, which comprises the following steps:
Substation fault signal is obtained in real time；
It acquisition failure substation and can turn the load data for substation, the failure substation and can turn for being arranged between substation
There is interconnector；
Building turn for constraint condition, including can turn for substation's total load constrain, interconnector maximum instantaneous load factor constraint and
Turn to maximize for load and constrain；
Based on the load data, is obtained using trial-and-error method and meet the Optimal Load turning solution turned for constraint condition.
2. the load transfer method according to claim 1 for improving distribution network reliability, which is characterized in that described using examination
Wrong method obtains described turn of the satisfaction Optimal Load turning solution for constraint condition and specifically includes:
1) it according to the load data of the failure substation, obtains wait go to the load point set that can turn to be powered for substation
It closes；
2) several load points in the load point set are cut off by a setting ratio, remaining load point access can turn for power transformation
It stands, is turned for calculating, whether system mode meets described turn for constraint condition, if so, record turns to supply at this time at this time for judgement
Scheme reduces the setting ratio, return step 2), if it is not, thening follow the steps 3)；
3) turning solution recorded is judged whether there is, if so, using the turning solution as Optimal Load turning solution, if
It is no, then increase the setting ratio, return step 2).
3. the load transfer method according to claim 1 for improving distribution network reliability, which is characterized in that described to turn to supply
Substation's total load constraint representation are as follows:
In formula: PiIndicate the load for needing to turn to wait turning to supply for region load point i；N is the total load point wait turn to supply；PjExpression can turn
For the load of substation region load point j；M is that can turn for substation region total load point；PBFor that can turn for power transformation
Group of standing becomes specified useful work power margin.
4. the load transfer method according to claim 1 for improving distribution network reliability, which is characterized in that the interconnection
Road maximum instantaneous load factor constraint representation are as follows:
In formula: PiIndicate the load for needing to turn to wait turning to supply for region load point i；N is the total load point wait turn to supply；Pl% indicates connection
Winding thread road maximum instantaneous load factor, PlFor interconnector maximum rated load；P1% be do not turn for when interconnector load factor.
5. the load transfer method according to claim 4 for improving distribution network reliability, which is characterized in that drawn using newton
Fu Xunfa to can turn to carry out Load flow calculation in topological structure for substation, obtain do not turn for when and interconnection switch be connected directly
Interconnection loads at this time, so obtain do not turn for when interconnector load factor.
6. a kind of load transfer device for improving distribution network reliability characterized by comprising
Starting module, for obtaining substation fault signal in real time；
Data acquisition module, for acquiring failure substation and can turn the load data for substation, the failure substation with
It can turn for being provided with interconnection switch between substation；
Constraint condition constructs module, turns for constructing for constraint condition, including can turn for the constraint of substation's total load, interconnector
Maximum instantaneous load factor constrains and turns to maximize for load and constrains；
Output module is obtained using trial-and-error method for being based on the load data and meets described turn for the optimal negative of constraint condition
Lotus turning solution.
7. the load transfer device according to claim 6 for improving distribution network reliability, which is characterized in that the output mould
Block includes:
Set record unit, for the load data according to the failure substation, obtaining can turn to carry out for substation wait go to
The load point set of power supply；
Load cuts off unit, for cutting off several load points in the load point set, remaining load by a setting ratio
Point access can turn to obtain corresponding turning solution for substation；
Turn to be turned for cutting off the turning solution that unit obtains according to the load for calculating, judgement is at this time for computing unit
Whether system mode meets described turn for constraint condition, if so, generating judging result signal, while record turns supplier at this time
Case, if it is not, then only directly generating judging result signal；
Load cuts off adjustment unit, for exporting Optimal Load turning solution according to the judging result signal, and described in adjustment
Setting ratio adjusted is transmitted to the load and cuts off unit by setting ratio.
8. a kind of load transfer device for improving distribution network reliability, which is characterized in that described to deposit including memory and processor
Reservoir is stored with computer program, and the processor calls the computer program to execute the side as described in claim 1-5 is any
The step of method.
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| CN110601188A (en) * | 2019-09-20 | 2019-12-20 | 国网天津市电力公司 | Rapid processing method for large-area power failure of power distribution network based on optimal regional load transfer strategy |
| CN111030109A (en) * | 2019-12-27 | 2020-04-17 | 广东电网有限责任公司 | Network-constrained power grid reserve capacity deduction calculation method and related device |
| 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 |
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