CN111313402B - N-1 transfer method and system for power distribution network - Google Patents
N-1 transfer method and system for power distribution network Download PDFInfo
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Abstract
The invention relates to the technical field of computers, in particular to a method and a system for N-1 switching of a power distribution network, which comprises the following steps: A) acquiring a distribution network topological structure and historical load data; B) establishing a contact list according to the classes; C) traversing each branch, and searching an optimal N-1 conversion scheme for the branch; D) sequentially finding an N-1 conversion scheme according to the sequence of a bus, a main transformer and a transformer substation; E) and C, when the distribution network has a supply transfer demand, carrying out supply transfer according to the supply transfer scheme obtained in the steps C to D and the real-time load of the distribution network. The substantial effects of the invention are as follows: the N-1 transfer scheme is generated for the branch circuit, the bus, the main transformer and the transformer substation respectively, the N-1 transfer scheme can be formulated for the distribution network comprehensively, and the efficiency of the distribution network transfer is improved; the transfer scheme is generated according to the historical load average value in a time period, so that the power failure time can be reduced; the distribution network switching defect can be found and an alarm is given.
Description
Technical Field
The invention relates to the technical field of computers, in particular to a method and a system for N-1 transfer of a power distribution network.
Background
The 'N-1' conversion of the power distribution network to power analysis needs a large amount of power distribution network topology analysis and load flow calculation. At present, the work still needs to be finished manually by depending on personnel, on one hand, the repetitive content in the work is more, a large amount of time is wasted for professionals in the regulation and control and operation modes of the power distribution network, on the other hand, the wiring of the power distribution network is gradually developed from single-connection to multi-section multi-connection, the topological structure is more and more complex, and the manual work cannot be competent for the complicated topological analysis and large-scale trend calculation. Therefore, it is urgently needed to develop a method capable of making a handover scheme.
Chinese patent CN110148934A, published 2019, 8, 20, and discloses a method for transferring load of a power distribution network by considering secondary transfer, wherein a genetic algorithm is used for solving a secondary transfer process, the maximum transferable load of the secondary transfer is taken as a target function, a transfer path of a power failure load is optimized under the condition of fully considering line constraint and main transformer constraint, and when the capacity of a target transformer substation is insufficient, the power supply recovery amount is improved through the secondary transfer. But the method cannot realize the 'N-1' switching scheme of the distribution network comprehensively.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the technical problem that an N-1 transfer scheme for a distribution network is not achieved comprehensively is solved. A method and a system for N-1 transfer of a power distribution network are provided, wherein transfer schemes can be completely formulated.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: a method for N-1 switching power supply of a power distribution network comprises the following steps: A) acquiring a distribution network topological structure and historical load data; B) counting four types of branches, buses, main transformers and substations in a distribution network, establishing contact tables according to the types, and marking historical average load of each device; C) traversing each branch, searching an N-1 transfer scheme for the branch according to the contact table, and using the scheme as the transfer scheme; D) sequentially traversing each object in each category according to the sequence of the bus, the main transformer and the transformer substation, and finding an N-1 transfer scheme according to the contact list; E) and C, when the distribution network has a supply transfer demand, carrying out supply transfer according to the supply transfer scheme obtained in the steps C to D. The N-1 transfer scheme is generated for the branch circuit, the bus, the main transformer and the transformer substation, the N-1 transfer scheme can be comprehensively formulated for the distribution network, and the efficiency of the distribution network transfer is improved. And E), firstly, performing transfer according to an N-1 transfer scheme, if the distribution network is not subjected to large-scale change and the load has spare allowance, directly performing transfer according to the transfer scheme obtained according to historical load data, and if the distribution network is subjected to large-scale change or large-capacity equipment is increased or decreased, re-executing the method to update the N-1 transfer scheme.
Preferably, in step B), the method for establishing the contact list comprises the following steps: B1) selecting branch BiVector (B)j,Ck) Represents branch BjAnd branch BiThrough the interconnection switch CkCommunicate, traverse all branches, with branch BiThe set of vectors formed by all the branches of the contact is used as branch BiSet of communication branches
B2) Traversing all the branches, finding out the contact branch set of each branch, wherein the contact branch sets of all the branches form a contact list of the branches; B3) and establishing a contact list of the bus, the main transformer and the transformer substation in the steps B1) to B2). And searching a contact branch set for each branch, and conveniently making a branch N-1 switching scheme.
Preferably, in step C), branch B is identified according to the contact listiThe method for searching the N-1 transfer scheme comprises the following steps:
C1) from a set of contact legs
In, according to branch BjScreening out branch B with insufficient residual capacity of main transformer due to capacity limitation of main transformeriThe average load of the communication branches, the set after screening out is recorded as
If it is
If the network is empty, a warning is given out to prompt the defects of the distribution network,
representation and branch BiThe vector corresponding to the branch of the interconnection, n representing the vector associated with branch BiThe number of branches connected, j ∈ [1, n ]]；
C2) Reading
Historical load data of a corresponding branch and historical load data of a main transformer to which the branch belongs;
C3) dividing a day into 96 time periods TiRespectively obtain
Indicating the branch in each time period TiLoad of
And the main transformer to which the branch belongs is arranged at each time interval TiLoad of
Margin of load
Wherein i ∈ [1,96 ]]；
C4) Respectively counting the daily time period T in the historical periodiTime, load margin
Mean value of
Mean value corresponding to branch
Sequentially arranged set from big to small
After sorting, the branch B is used asiConstitutes a time interval TiTime branch BiThe N-1 convertant scheme of (1); the generation of the scheme of supplying is changeed according to historical load mean value under the period, can provide feasible commentaries on classics supply scheme under joining in marriage the little condition of net change, when taking place to change the supply demand, directly according to the commentaries on classics supply scheme under the corresponding period supply can, need not read real-time load, carry out computational analysis for the efficiency of changeing the supply, reduced the power off time, if join in marriage net and carried out the step of this patent again than having carried out great change.
Preferably, in step C4), the daily period T within the historical cycle is calculatediTime, load margin
Mean value of
And standard deviation of
Computing feature values by weight
Characteristic value corresponding to branch
Sequentially arranged set from big to small
After sorting, the branch B is used asiIn the supply sequence of (1), constituting branch BiThe N-1 transition scheme of (1). Selecting a time period T by standard deviationiThe branch with small time load fluctuation, alpha, beta,
And
are all directly carried out by using the values thereofCalculation is a dimensionless number, and only the method needs to be executed
And
the units are unified respectively.
Preferably, in the step D), the method for finding the bus bar transfer scheme according to the contact list includes: D11) sequentially obtaining the N-1 switching scheme of each branch under the bus, and taking the set of the N-1 switching scheme as the N-1 switching scheme of the bus; D12) if there is a branch in the N-1 switching scheme in step D11), set
If all the branches in the system are under the power-off bus, the collection is tried first
The branch in the bus is transferred, if the transfer is successful, the transfer of the bus lower branch is continued, and if the transfer is integrated, the bus lower branch is transferred
If the branch switching fails, a warning is sent out to prompt the defects of the distribution network; D13) if there is a branch in the N-1 switching scheme in step D11), set
If the main transformer load margins corresponding to the branches are insufficient, a warning is given out to prompt the defects of the distribution network. The bus transfer scheme is provided, the bus transfer efficiency can be accelerated, the condition that the bus cannot be subjected to N-1 transfer is found in advance, and the alarm for the distribution network defect is sent out.
Preferably, in the step D), the method for finding the main transformer transfer scheme according to the contact list comprises the following steps: D21) judging whether the main transformer has a bus branch switch which can be connected, if not, entering the step D23), if so, judging whether the bus load allowance of the main transformer which is completely transferred to the bus branch switch which can be connected is enough, if so, judging whether the bus load allowance is enoughThen the transfer is used as the N-1 transfer scheme of the main transformer, otherwise, the step D22) is carried out; D22) selecting one branch of a bus under a main transformer for switching, then judging whether the load allowance of the bus capable of being communicated is enough again, if so, taking the switching as an N-1 switching scheme of the main transformer, otherwise, selecting one branch of the bus under the main transformer for switching until the load allowance of the bus capable of being communicated is enough, taking the switching scheme as an N-1 switching scheme of the main transformer, if all branches of the bus under the main transformer are switched, the load allowance of the bus capable of being communicated is still not enough, switching the branch under the bus capable of being communicated until the load allowance of the bus capable of being communicated is enough, taking the switching scheme as an N-1 switching scheme of the main transformer, and if all branches of the bus capable of being communicated are switched, the load allowance of the bus capable of being communicated is still not enough, sending an alarm to prompt the defect of a distribution network; D23) the method comprises the steps that buses under a main transformer are sequentially used as independent outage buses for switching, if the buses under the main transformer are all switched, the switching scheme is used as an N-1 switching scheme of the main transformer, and if the N-1 switching scheme of a branch under a certain bus exists in the switching scheme of the buses under the main transformer, the buses under the main transformer are integrated
If the main transformer load margins corresponding to the branches are insufficient, a warning is given out to prompt the defects of the distribution network. The main transformer power supply conversion scheme is provided, the main transformer power supply conversion efficiency can be accelerated, the condition that the main transformer can not be subjected to N-1 power supply conversion is found in advance, and the distribution network defect alarm is sent out.
Preferably, in the step D), the method for finding the transfer scheme of the substation according to the contact list comprises the following steps: D31) and respectively carrying out transfer supply on main transformers under the transformer substation, if the main transformers under the transformer substation are all successfully transferred, taking the transfer supply scheme as an N-1 transfer supply scheme of the transformer substation, otherwise, sending a warning to prompt the defects of the distribution network.
Preferably, in the step E), when the branch supply demand of the distribution network occurs, the branch supply demand is determined according to the current time interval TiCorresponding branch BiThe N-1 transshipment scheme of (1).
A distribution network N-1 transfer system is used for executing the distribution network N-1 transfer method, and comprises a data processing unit, a data storage unit, a data communication unit and a display, wherein the data communication unit is connected with a distribution network dispatching center database, the display is used for displaying an N-1 transfer scheme or alarm information, the data storage unit, the data communication unit and the display are all connected with the data processing unit, and the data processing unit executes the following steps: A) acquiring a distribution network topological structure and historical load data; B) counting four types of equipment, namely branches, buses, main transformers and substations in a distribution network, establishing contact tables according to the types, and marking historical average load of each equipment; C) traversing each branch, searching an N-1 transfer scheme for the branch according to the contact table, and using the scheme as the transfer scheme; D) sequentially traversing each object in each category according to the sequence of the bus, the main transformer and the transformer substation, and finding an N-1 transfer scheme according to the contact list; E) and C, when the distribution network has a supply transfer demand, carrying out supply transfer according to the supply transfer scheme obtained in the steps C to D and the real-time load of the distribution network.
The substantial effects of the invention are as follows: the N-1 transfer scheme is generated for the branch circuit, the bus, the main transformer and the transformer substation respectively, the N-1 transfer scheme can be formulated for the distribution network comprehensively, and the efficiency of the distribution network transfer is improved; the method has the advantages that the transfer scheme is generated according to the historical load average value in the time period, a feasible transfer scheme can be provided under the condition that the distribution network is not changed greatly, when the transfer requirement occurs, the transfer can be directly performed according to the transfer scheme in the corresponding time period, the real-time load does not need to be read, and the power failure time is shortened; the distribution network switching defect can be found and an alarm is given.
Drawings
Fig. 1 is a block diagram of a process of an N-1 power transfer method of a power distribution network according to an embodiment.
FIG. 2 is a flowchart illustrating a method for creating a contact list according to an embodiment.
Fig. 3 is a flow chart of a branch transfer scheme generation method according to an embodiment.
Fig. 4 is a block diagram of an N-1 distribution system of a power distribution network according to an embodiment.
Wherein: 100. data storage unit, 200, data communication unit, 300, data processing unit, 400, display.
Detailed Description
The following provides a more detailed description of the present invention, with reference to the accompanying drawings.
The first embodiment is as follows:
a method for N-1 switching of a power distribution network, as shown in fig. 1, in this embodiment, includes the following steps: A) acquiring a distribution network topological structure and historical load data; B) counting four types of branches, buses, main transformers and substations in a distribution network, establishing contact tables according to the types, and marking historical average load of each device; C) traversing each branch, searching an N-1 transfer scheme for the branch according to the contact table, and using the scheme as the transfer scheme; D) sequentially traversing each object in each category according to the sequence of the bus, the main transformer and the transformer substation, and finding an N-1 transfer scheme according to the contact list; E) and C, when the distribution network has a supply transfer demand, carrying out supply transfer according to the supply transfer scheme obtained in the steps C to D. And E), firstly, performing transfer according to an N-1 transfer scheme, if the distribution network is not subjected to large-scale change and the load has spare allowance, directly performing transfer according to the transfer scheme obtained according to historical load data, and if the distribution network is subjected to large-scale change or large-capacity equipment is increased or decreased, re-executing the method to update the N-1 transfer scheme.
As shown in fig. 2, in step B), the method for establishing the contact list includes:
B1) selecting branch BiVector (B)j,Ck) Represents branch BjAnd branch BiThrough the interconnection switch CkCommunicate, traverse all branches, with branch BiThe set of vectors formed by all the branches of the contact is used as branch BiSet of communication branches
B2) Traversing all the branches, finding out the contact branch set of each branch, wherein the contact branch sets of all the branches form a contact list of the branches;
B3) establishing a contact list of the bus, the main transformer and the transformer substation in the steps B1) to B2); and searching a contact branch set for each branch, and conveniently making a branch N-1 switching scheme.
As shown in fig. 3, in step C), branch B is identified according to the contact tableiThe method for searching the N-1 transfer scheme comprises the following steps:
C1) from a set of contact legs
In, according to branch BjScreening out branch B with insufficient residual capacity of main transformer due to capacity limitation of main transformeriThe average load of the communication branches, the set after screening out is recorded as
If it is
If the network is empty, a warning is given out to prompt the defects of the distribution network,
representation and branch BiThe vector corresponding to the branch of the interconnection, n representing the vector associated with branch BiThe number of branches connected, j ∈ [1, n ]]；
C2) Reading
Historical load data of a corresponding branch and historical load data of a main transformer to which the branch belongs;
C3) dividing a day into 96 time periods TiRespectively obtain
Indicating the branch in each time period TiLoad of
And the main transformer to which the branch belongs is arranged at each time interval TiLoad of
Margin of load
Wherein，i∈[1,96]；
C4) Respectively counting the daily time period T in the historical periodiTime, load margin
Mean value of
Mean value corresponding to branch
Sequentially arranged set from big to small
After sorting, the branch B is used asiConstitutes a time interval TiTime branch BiThe N-1 transition scheme of (1).
The generation of the scheme of supplying is changeed according to historical load mean value under the period, can provide feasible commentaries on classics supply scheme under joining in marriage the little condition of net change, when taking place to change the supply demand, directly according to the commentaries on classics supply scheme under the corresponding period supply can, need not read real-time load, carry out computational analysis for the efficiency of changeing the supply, reduced the power off time, if join in marriage net and carried out the step of this patent again than having carried out great change.
The method for finding the bus transfer scheme according to the contact list comprises the following steps: D11) sequentially obtaining the N-1 switching scheme of each branch under the bus, and taking the set of the N-1 switching scheme as the N-1 switching scheme of the bus; D12) if there is a branch in the N-1 switching scheme in step D11), set
If all the branches in the system are under the power-off bus, the collection is tried first
The branch in the bus is transferred, if the transfer is successful, the transfer of the bus lower branch is continued, and if the transfer is integrated, the bus lower branch is transferred
If the branch switching fails, a warning is sent out to prompt the defects of the distribution network; D13) if there is a branch in the N-1 switching scheme in step D11), set
If the main transformer load margins corresponding to the branches are insufficient, a warning is given out to prompt the defects of the distribution network. The bus transfer scheme is provided, the bus transfer efficiency can be accelerated, the condition that the bus cannot be subjected to N-1 transfer is found in advance, and the alarm for the distribution network defect is sent out. The method for finding the main transformer transfer scheme according to the contact list comprises the following steps: D21) judging whether the main transformer has a bus branch switch which can be connected, if not, entering a step D23), if so, judging whether all buses under the main transformer are transferred to the bus load allowance which can be connected with the bus branch switch enough, if so, taking the transfer as an N-1 transfer scheme of the main transformer, otherwise, entering a step D22); D22) selecting one branch of a bus under a main transformer for switching, then judging whether the load allowance of the bus capable of being communicated is enough again, if so, taking the switching as an N-1 switching scheme of the main transformer, otherwise, selecting one branch of the bus under the main transformer for switching until the load allowance of the bus capable of being communicated is enough, taking the switching scheme as an N-1 switching scheme of the main transformer, if all branches of the bus under the main transformer are switched, the load allowance of the bus capable of being communicated is still not enough, switching the branch under the bus capable of being communicated until the load allowance of the bus capable of being communicated is enough, taking the switching scheme as an N-1 switching scheme of the main transformer, and if all branches of the bus capable of being communicated are switched, the load allowance of the bus capable of being communicated is still not enough, sending an alarm to prompt the defect of a distribution network; D23) the method comprises the steps that buses under a main transformer are sequentially used as independent outage buses for switching, if the buses under the main transformer are all switched, the switching scheme is used as an N-1 switching scheme of the main transformer, and if the N-1 switching scheme of a branch under a certain bus exists in the switching scheme of the buses under the main transformer, the buses under the main transformer are integrated
The main transformer load margins corresponding to the branches are all not allAnd if yes, warning is given out to prompt the defects of the distribution network. The main transformer power supply conversion scheme is provided, the main transformer power supply conversion efficiency can be accelerated, the condition that the main transformer can not be subjected to N-1 power supply conversion is found in advance, and the distribution network defect alarm is sent out. The method for finding the transfer scheme of the substation according to the contact list comprises the following steps: D31) and respectively carrying out transfer supply on main transformers under the transformer substation, if the main transformers under the transformer substation are all successfully transferred, taking the transfer supply scheme as an N-1 transfer supply scheme of the transformer substation, otherwise, sending a warning to prompt the defects of the distribution network.
A distribution network N-1 transfer system is used for executing the distribution network N-1 transfer method, as shown in FIG. 4, the system comprises a data processing unit 300, a data storage unit 100, a data communication unit 200 and a display 400, the data communication unit 200 is connected with a distribution network dispatching center database, the display 400 is used for displaying an N-1 transfer scheme or alarm information, the data storage unit 100, the data communication unit 200 and the display 400 are all connected with the data processing unit 300, and the data processing unit 300 executes the following steps: A) acquiring a distribution network topological structure and historical load data; B) counting four types of equipment, namely branches, buses, main transformers and substations in a distribution network, establishing contact tables according to the types, and marking historical average load of each equipment; C) traversing each branch, searching an N-1 transfer scheme for the branch according to the contact table, and using the scheme as the transfer scheme; D) sequentially traversing each object in each category according to the sequence of the bus, the main transformer and the transformer substation, and finding an N-1 transfer scheme according to the contact list; E) and C, when the distribution network has a supply transfer demand, carrying out supply transfer according to the supply transfer scheme obtained in the steps C to D and the real-time load of the distribution network.
In this embodiment, step C4) can be replaced by the following steps as a new embodiment: in step C4), the daily period T within the history cycle is calculatediTime, load margin
Mean value of
And standard deviation of
Computing feature values by weight
Characteristic value corresponding to branch
Sequentially arranged set from big to small
After sorting, the branch B is used asiIn the supply sequence of (1), constituting branch BiThe N-1 transition scheme of (1). Selecting a time period T by standard deviationiThe branch with small time load fluctuation, alpha, beta,
And
all directly use the numerical value to calculate, namely, the numerical value is a dimensionless numerical value, and only the method needs to be ensured to be executed
And
the units are unified respectively.
The above-described embodiments are only preferred embodiments of the present invention, and are not intended to limit the present invention in any way, and other variations and modifications may be made without departing from the spirit of the invention as set forth in the claims.
Claims (7)
1. A method for N-1 switching power distribution network is characterized in that,
the method comprises the following steps:
A) acquiring a distribution network topological structure and historical load data;
B) counting four types of branches, buses, main transformers and substations in a distribution network, establishing contact tables according to the types, and marking historical average load of each device;
C) traversing each branch, and searching an N-1 transfer scheme for the branch according to the contact table;
D) sequentially traversing each object in each category according to the sequence of the bus, the main transformer and the transformer substation, and finding an N-1 transfer scheme according to the contact list;
E) when the distribution network has a supply transfer demand, carrying out supply transfer according to the N-1 supply transfer scheme obtained in the steps C to D;
in the step B), the method for establishing the contact list comprises the following steps:
B1) selecting branch BiVector (B)j,Ck) Represents branch BjAnd branch BiThrough the interconnection switch CkCommunicate, traverse all branches, with branch BiThe set of vectors formed by all the branches of the contact is used as branch BiSet of communication branches
B2) Traversing all the branches, finding out the contact branch set of each branch, wherein the contact branch sets of all the branches form a contact list of the branches;
B3) establishing a contact list of the bus, the main transformer and the transformer substation in the steps B1) to B2);
in step C), the branch B is taken as a contact tableiThe method for searching the N-1 transfer scheme comprises the following steps:
C1) from a set of contact legs
In, according to branch BjScreening out branch B with insufficient residual capacity of main transformer due to capacity limitation of main transformeriThe average load of the communication branches, the set after screening out is recorded as
If it is
If the network is empty, a warning is given out to prompt the defects of the distribution network,
representation and branch BiThe vector corresponding to the branch of the interconnection, n representing the vector associated with branch BiThe number of branches connected, j ∈ [1, n ]]；
C2) Reading
Historical load data of a corresponding branch and historical load data of a main transformer to which the branch belongs;
C3) dividing a day into 96 time periods TiRespectively obtain
Indicating the branch in each time period TiLoad of
And the main transformer to which the branch belongs is arranged at each time interval TiLoad of
Margin of load
Wherein i ∈ [1,96 ]]；
C4) Respectively counting the daily time period T in the historical periodiTime, load margin
Mean value of
Mean value corresponding to branch
Sequentially arranged set from big to small
After sorting, the branch B is used asiConstitutes a time interval TiTime branch BiThe N-1 transition scheme of (1).
2. The N-1 switching method for the power distribution network according to claim 1,
in step C4), the daily period T within the history cycle is calculatediTime, load margin ΔTiMean value of
And standard deviation of
Computing feature values by weight
Characteristic value corresponding to branch
Sequentially arranged set from big to small
After sorting, the branch B is used asiIn the supply sequence of (1), constituting branch BiThe N-1 transition scheme of (1).
3. The N-1 switching method for the distribution network according to claim 1 or 2,
in the step D), the method for finding the bus transfer scheme according to the contact list comprises the following steps:
D11) sequentially obtaining the N-1 switching scheme of each branch under the bus, and taking the set of the N-1 switching scheme as the N-1 switching scheme of the bus;
D12) if N-1 switching of a certain branch exists in the step D11)In the scheme, a set
If all the branches in the system are under the power-off bus, the collection is tried first
The branch in the bus is transferred, if the transfer is successful, the transfer of the bus lower branch is continued, and if the transfer is integrated, the bus lower branch is transferred
If the branch switching fails, a warning is sent out to prompt the defects of the distribution network;
D13) if there is a branch in the N-1 switching scheme in step D11), set
If the main transformer load margins corresponding to the branches are insufficient, a warning is given out to prompt the defects of the distribution network.
4. The N-1 switching method for the power distribution network according to claim 3,
in the step D), the method for finding the main transformer transfer scheme according to the contact list comprises the following steps:
D21) judging whether the main transformer has a bus branch switch which can be connected, if not, entering a step D23), if so, judging whether all buses under the main transformer are transferred to the bus load allowance which can be connected with the bus branch switch enough, if so, taking the transfer as an N-1 transfer scheme of the main transformer, otherwise, entering a step D22);
D22) selecting one branch of a bus under a main transformer for switching, then judging whether the load allowance of the bus capable of being communicated is enough again, if so, taking the switching as an N-1 switching scheme of the main transformer, otherwise, selecting one branch of the bus under the main transformer for switching until the load allowance of the bus capable of being communicated is enough, taking the switching scheme as an N-1 switching scheme of the main transformer, if all branches of the bus under the main transformer are switched, the load allowance of the bus capable of being communicated is still not enough, switching the branch under the bus capable of being communicated until the load allowance of the bus capable of being communicated is enough, taking the switching scheme as an N-1 switching scheme of the main transformer, and if all branches of the bus capable of being communicated are switched, the load allowance of the bus capable of being communicated is still not enough, sending an alarm to prompt the defect of a distribution network;
D23) the method comprises the steps that buses under a main transformer are sequentially used as independent outage buses for switching, if the buses under the main transformer are all switched, the switching scheme is used as an N-1 switching scheme of the main transformer, and if the N-1 switching scheme of a branch under a certain bus exists in the switching scheme of the buses under the main transformer, the buses under the main transformer are integrated
If the main transformer load margins corresponding to the branches are insufficient, a warning is given out to prompt the defects of the distribution network.
5. The N-1 switching method for the distribution network according to claim 1 or 2,
in the step D), the method for finding the transfer scheme of the transformer substation according to the contact table comprises the following steps:
D31) and respectively carrying out transfer supply on main transformers under the transformer substation, if the main transformers under the transformer substation are all successfully transferred, taking the transfer supply scheme as an N-1 transfer supply scheme of the transformer substation, otherwise, sending a warning to prompt the defects of the distribution network.
6. The N-1 switching method for the distribution network according to claim 1 or 2,
in the step E), when the branch switching supply demand of the distribution network occurs, according to the current time interval TiCorresponding branch BiThe N-1 transshipment scheme of (1).
7. A distribution network N-1 transfer system for performing a distribution network N-1 transfer method according to any one of claims 1 to 6,
the intelligent monitoring system comprises a data processing unit, a data storage unit, a data communication unit and a display, wherein the data communication unit is connected with a distribution network dispatching center database, the display is used for displaying an N-1 switching scheme or alarm information, and the data storage unit, the data communication unit and the display are all connected with the data processing unit.
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| CN106300339A (en) * | 2016-08-29 | 2017-01-04 | 国电南瑞科技股份有限公司 | A kind of Fault Isolation based on unit style power distribution network and service restoration method |
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