CN114530846A - Power distribution network transfer network reconstruction method, device and storage medium - Google Patents
Power distribution network transfer network reconstruction method, device and storage medium Download PDFInfo
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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
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/14—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by switching loads on to, or off from, network, e.g. progressively balanced loading
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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
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
Abstract
The invention relates to a method and a device for reconstructing a power distribution network transfer network and a storage medium. According to the method, a corresponding power distribution network connection line model based on an equipment ordered tree model is constructed according to the grid structure information of a power distribution network where a power supply line is required to be transferred; judging whether the line needing to be transferred is a single interconnection line in the power distribution network interconnection line model; if so, determining a transferable interval of the line to be transferred according to the load margin of the contact line corresponding to the line to be transferred and the section load of the line to be transferred; otherwise, determining the supportable supply intervals of all interconnection switches by combining the interconnection switch loads on all interconnection lines, the supply and take subordinate minimum sectional loads of all switch equipment on the supply and supply line and the topological structure of the distribution network interconnection line model; and (4) solving an optimal operation mode by linear programming under the condition of meeting optimization constraint conditions by taking load balance of each connection line as a target. The reconstruction of the power distribution network transfer network and the optimization of operation after the reconstruction are realized.
Description
Technical Field
The invention relates to the field of power distribution network transfer reconfiguration, in particular to a power distribution network transfer network reconfiguration method, a power distribution network transfer network reconfiguration device and a storage medium.
Background
The distribution network is used as an important link for connecting a power grid and a user, if the distribution network fails, the power supply effect of the user can be directly reflected, most directly, the power failure fault is generated, normal production and life are influenced, and huge economic loss can be brought.
At present, a multi-section and multi-network structure and a closed-loop wiring and open-loop operation mode are widely adopted in the power distribution network in China to realize section adjustment and self-healing, a plurality of various switches are installed in a distribution network system, and the complexity is high. On one hand, due to the fact that the network structure is increasingly complex, operation and inspection planners are easy to cause deficiency or redundancy when planning multi-contact lines, line load is too heavy or the utilization rate of equipment is low, and particularly for many distribution network systems constructed in early stages, the network frame structure is unreasonable, the power supply quality is poor, and the possibility of operation faults is high. On the other hand, when the power distribution network has a fault, the fault area needs to be isolated and repaired as soon as possible, and the influence of the fault on the whole power distribution network needs to be reduced as much as possible through load transfer. During fault processing, due to the fact that the load changes in real time, the switching paths are complex and various, distribution network regulating and controlling personnel need to spend a large amount of time for analyzing and selecting the optimal switching path, and power supply in a non-fault area is difficult to recover in time.
Therefore, when the power distribution network fails, an algorithm is needed to optimize and select a power distribution network transfer scheme, determine an optimal scheme with the strongest execution feasibility, and ensure that the load transfer scheme can form the minimum power failure range.
In the related art disclosed so far: chinese patent [202010112113.6] proposes a method and system for N-1 transfer of power distribution network. And establishing a contact table through the distribution network topology structure and the historical load data, traversing each branch, and respectively generating an N-1 switching scheme for the branch, the bus, the main transformer and the transformer substation. And when the distribution network has a supply transfer demand, carrying out supply transfer according to the previously obtained supply transfer scheme and the real-time load of the distribution network. The method is based on a normal net rack topological structure and established on the basis of known user load data characteristics, the condition that the transfer load must meet the N-1 condition is limited, and under the condition that the spare margin of a contact line does not meet the N-1 condition, the personnel cannot be adjusted and controlled in an auxiliary mode to analyze the real-time load transfer condition of the distribution network.
Chinese patent [201910008649.0] proposes an auxiliary decision analysis method for load transfer of a power distribution network. The historical load curves of the lines to be transferred out three days before are called, the load curves of the lines to be transferred out and the load curves of the lines which can be transferred in are added and synthesized one by one, abnormal loads during the adjustment period of the lines to be transferred out are eliminated, and the safety verification of the load transfer of the power distribution network, the reliability verification of the load transfer of the power distribution network and the correction verification of the load transfer of the power distribution network are carried out, so that the optimal scheme selection of the load transfer of the power distribution network is realized. The method generates a supply transfer scheme based on the historical negative average value in a time period, removes partial load, and is difficult to comprehensively reflect the real-time running condition and the special mode of a supply transfer line.
Chinese patent [201810772493.9] proposes an automatic generation method for a power supply conversion scheme of a transformer substation voltage-loss distribution network. The method comprises the steps of establishing a data interface with each large-phase relation system to obtain relevant data information, combining system data to generate a power supply conversion scheme for a network line, a 10kV bus serial power supply scheme for a distribution line which cannot be converted, load condition analysis of a main transformer and a main network line to which the distribution line on the opposite side of the power supply conversion side belongs, and important user analysis and plan support of transformer substation voltage loss influence through data processing and analysis. The method considers real-time load under the fault, but is still limited to the original grid structure, grid reconstruction optimization is not carried out aiming at the load rate of each element, a multi-segment multi-connection topological structure of the power distribution network is not considered, and evaluation and optimization of thinning to a branch line level cannot be realized.
Disclosure of Invention
In order to solve the technical problems or at least partially solve the technical problems, the invention provides a power distribution network transfer network reconstruction method, a device and a storage medium.
In a first aspect, the present invention provides a method for reconstructing a network to be transferred from a power distribution network, including:
collecting the grid structure information of a power distribution network where a circuit needing to be transferred is located;
constructing a corresponding power distribution network contact line model based on the equipment ordered tree model according to the power distribution network frame structure information of the line needing to be transferred;
judging whether the line needing to be transferred is a single interconnection line in the power distribution network interconnection line model;
if so, determining a transferable interval of the line to be transferred according to the load margin of the connection line corresponding to the line to be transferred and the section load of the line to be transferred;
otherwise, determining the supportable supply section of each interconnection switch by combining the interconnection switch load on each interconnection line, the supply and take lower-stage minimum sectional load of each switch device on the supply and take-over line and the topological structure of the distribution network interconnection line model;
and (4) aiming at load balance of each connection line, and solving the optimal operation mode by linear programming under the condition of meeting the optimization constraint condition.
Further, the device ordered tree model includes: representing the root of the power supply, representing the nodes of the switching device, representing the line segments of the line.
Further, the determining the transferable region of the transfer-required line according to the load margin of the communication line corresponding to the transfer-required line and the section load of the transfer-required line includes:
determining a connection line corresponding to a line needing to be transferred;
calculating the load margin of the interconnection line by subtracting the real-time load of the interconnection line from the rated load of the interconnection line;
calculating section loads between each section switch and the interconnection switch on the main path of the circuit to be supplied;
and taking the section of the line needing to be transferred and supplied with the section load smaller than the load margin as a transferable section of the line needing to be transferred and supplied.
Further, the determining the supported transferable zones of the respective tie switches by combining the tie switch loads on the respective tie lines, the supply and lower minimum segment loads of the respective switching devices on the transfer-required line, and the topology of the distribution network tie line model includes:
traversing interconnection switches SL1, SL2, … and SLn between the circuit to be switched and each interconnection circuit, and determining n main paths from each interconnection switch to the power supply of the circuit to be switched;
traversing the switch devices along each main path from the interconnection switch, and calculating the residual load margin of each interconnection switch load after the interconnection switch load passes through the minimum sectional load of each switch device on the supply lower stage;
and selecting the interconnection switch for switching the equipment switches according to the maximum value of the residual load margin of each branch switch supported by each interconnection switch load so as to determine the switching range supported by each interconnection switch.
Further, calculating the supply subordinate minimum segment loads of the respective switching devices comprises:
acquiring real-time loads of each switching device;
if the switching equipment is a section switch, calculating the minimum section load of the switching equipment at the lower level according to the real-time load of each switching equipment and the topological position of the switching equipment in the power distribution network connection line model: l'SSk＝LSSk-LSS(k-1)；
Wherein, L'sskIndicating the supply of the switching device ssk with the lower minimum section load, LSSkRepresenting the real-time load of the switchgear SSk, LSS(k-1)Represents the real-time load of the switching device SS (k-1);
if the switchgear is an end switch, the supply of the switchgear carries the lowest section load of the lower level: l'SSk＝LSSk。
Further, according to the following formula: m[SL,SSk]＝M-(L′SS1+L′SS2+…+L′SSk) And calculating the residual load margin of each interconnection switch load after the interconnection switch load passes through the minimum sectional load of each switching device for carrying the next stage, wherein M represents the load provided by the interconnection switch.
Furthermore, aiming at load balancing of each connection line, the linear programming solution of the optimal operation mode under the condition of meeting the optimization constraint condition comprises the following steps:
calculating the load balance degree of each reconstructed contact line:
determining optimization constraints of the connection line:
in the formula, LiThe real-time load of the line is,
rated load, T, of line iminAnd TmaxRespectively representing maximum and minimum load limits, X, of a main transformer in a power distribution network lineiImpedance of the ith line; l(i)、x(i)The length of each section of line and the impedance value, X, of the unit length of the corresponding wire in the longest path of the ith line supplied through the interconnection switchi+∑x(i)l(i)The impedance value of the tail end of the ith line after reconstruction is obtained;
the maximum impedance value is obtained by reduction under the minimum operation mode of the system according to the time-limited current quick-break protection setting value of the line i;
and performing linear programming based on the smaller the optimization constraint condition and the load balance degree is, and solving the optimal supply and take lower-level minimum sectional load of each switching device.
In a second aspect, the present invention provides an apparatus for implementing network reconfiguration of a distribution network, including: the power distribution network transfer network reconfiguration method comprises a processing unit, a storage unit, a bus unit, an input unit and a display unit, wherein the bus unit is connected with the processing unit, the storage unit, the input unit and the display unit, the storage unit stores at least one instruction, and the processing unit reads and executes the instruction to realize the power distribution network transfer network reconfiguration method.
In a third aspect, the present invention provides a storage medium for implementing network reconfiguration of a distribution network, where the storage medium for implementing network reconfiguration of a distribution network stores at least one instruction, and reads and executes the instruction to implement the method for reconfiguring the network reconfiguration of a distribution network.
Compared with the prior art, the technical scheme provided by the embodiment of the invention has the following advantages:
1. the method comprises the steps of defining an ordered tree model of the equipment, constructing a power distribution network connection line model according to power distribution network architecture information based on the ordered tree model of the equipment, and more conveniently carrying out analysis on the aspects of power distribution, load distribution and optimization reconstruction of the power distribution network through inter-line connection.
2. And for the multi-connection transfer-required line, carrying out topology search on equipment switches upwards step by step along a plurality of main paths of the interconnection switches by using a power distribution network interconnection line model, selecting the interconnection switch transfer providing the maximum residual load margin for the branch switches, and finally determining the transferable interval of each interconnection switch.
3. Aiming at the grid structure with excessive line load or low equipment utilization rate, the load balance of the contact line is taken as a target, and under the condition of meeting optimization constraint conditions, the optimal operation mode is solved through linear programming, so that the load balance of the contact line is ensured, the operation risk of equipment is reduced, and the equipment utilization rate is effectively improved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.
Fig. 1 is a flowchart of a power distribution network transfer network reconfiguration method according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a switching device and nodes representing an ordered tree model of the switching device according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a power distribution network connection line model of a multi-connection line according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a power distribution network connection line model of a single connection line according to an embodiment of the present invention;
fig. 5 is a flowchart for determining a transferable interval of a line to be transferred according to a load margin of a connection line corresponding to the line to be transferred and a section load of the line to be transferred, according to an embodiment of the present invention;
fig. 6 is a flowchart for determining a supportable transferable interval of each interconnection switch by combining a topology structure of an interconnection switch load on each interconnection line, a minimum sectional load on a supply band lower level of each switching device on a supply-required transfer line, and an interconnection line model of a power distribution network, according to an embodiment of the present invention;
fig. 7 is a schematic diagram of a device for implementing network reconfiguration of a power distribution network according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Referring to fig. 1, an embodiment of the present invention provides a method for reconstructing a power distribution network to be transferred to a network, including:
s100, collecting the grid structure information of a power distribution network where a circuit needing to be transferred is located;
s200, constructing a corresponding power distribution network connection line model based on the equipment ordered tree model according to the power distribution network structure information of the power distribution network where the line needing to be transferred is located; in the specific implementation process, as shown by referring to fig. 2, fig. 3, and fig. 4, the device ordered tree model includes: the method comprises the steps of representing the root of a power supply, representing nodes of switch equipment, representing line segments of a line, abstracting corresponding transformer equipment into the power supply according to the grid structure information of the power distribution network, abstracting the switch equipment into the nodes, and abstracting the line into the line segments to establish a power distribution network connection line model. For the power distribution network connection line model, the node power flow direction on the main path between the power supplies is non-fixed and is a bidirectional node, and the node power flow direction on the branch path is fixed and is a unidirectional node. In the power distribution network connection line model, the section between the nodes is the minimum unit for power distribution network transfer and optimization reconstruction.
S300, judging whether the line needing to be transferred is a single interconnection line in the power distribution network interconnection line model; if yes, executing S400, otherwise executing S500.
S400, determining a transferable interval of the line to be transferred according to the load margin of the connecting line corresponding to the line to be transferred and the section load of the line to be transferred.
In a specific implementation process, referring to fig. 5, the determining a transferable region of the line to be transferred according to the load margin of the connection line corresponding to the line to be transferred and the section load of the line to be transferred includes:
s401, determining a connection line corresponding to a line needing to be transferred; and setting the communication line of the line j to be transferred of the single communication line as a communication line i.
S402, calculating the load margin of the interconnection line by subtracting the real-time load of the interconnection line from the rated load of the interconnection line; in the concrete implementation process, the real-time load L of the communication line iiRated load of the interconnection line i is
The load margin of the contact line i is
S403, calculating section loads between each section switch and the interconnection switch on the main path of the circuit to be switched; as shown in fig. 6, the interconnection switch between the interconnection line i and the supply-required line j is set to SL, and the section load L between each section switch and the interconnection switch on the main path of the supply-required line is calculatedjSSk。
S404, taking the section of the line needing to be transferred with the section load smaller than the load margin as the transferable section of the line needing to be transferred, LjSSk<Mi。
And S500, determining the supportable supply section of each interconnection switch by combining the interconnection switch load on each interconnection line, the supply and take lower-stage minimum sectional load of each switch device on the supply and take-over line and the topological structure of the distribution network interconnection line model.
In a specific implementation process, referring to fig. 6, the determining, by combining the topology structures of the interconnection switch load on each interconnection line, the minimum sectional load on the supply band lower level of each switching device on the transfer-required line, and the interconnection line model of the power distribution network, the supportable transferable region of each interconnection switch includes:
s501, traversing interconnection switches SL1, SL2, … and SLn between the circuit needing to be switched and each interconnection circuit, and determining n main paths from each interconnection switch to the power supply of the circuit needing to be switched.
S502, defining a count variable k ═ 1;
s503, searching the kth switch device along each main path from the interconnection switch SLi, and calculating the residual load margin of the interconnection switch SLi after the load is accumulated by the lowest section of the supply band of the kth switch device.
In a specific implementation process, the step of calculating the residual load margin of the interconnection switch SLi load after the load is supplied with the lowest section accumulated load of the kth switch device comprises the following steps:
acquiring real-time loads of each switching device;
if the switching equipment is a section switch, calculating the minimum section load of the switching equipment at the lower level according to the real-time load of each switching equipment and the topological position of the switching equipment in the power distribution network connection line model: l'SSk＝LSSk-LSS(k-1)；
Wherein, L'SSkIndicating the minimum section load of the supply subordinate of the switching device SSk, LSSkRepresenting the real-time load of the switchgear SSk, LSS(k-1)Represents the real-time load of the switching device SS (k-1);
if the switching device is an end switch, the minimum section load of the supply belt subordinate of the switching device is equal to the real-time load of the switching device: l'SSk＝LSSk。
According to the following formula: m[SLi,SSk]＝Mi-(L'SS1+L'SS1……+L'SSk) Calculating the residual load margin of the load of the interconnection switch SLi after the load is accumulated by the lowest section of the supply lower level of the kth switch device, wherein MiRepresenting the load provided by the tie switch SLi.
S504, judging the residual load margin
If the value is greater than zero, S505 is executed, otherwise S508 is executed.
S505, determine whether the kth device switch SSk is a branch switch, if yes, execute S506, otherwise execute S507.
S506, if the residual domain load margin of the current branch switch SSk supported by the tie switch SLi is the maximum value of the residual load margins of the current branch switch supported by the respective tie switch loads, then S507 is executed, otherwise S508 is executed.
S507, self-adding one to k, and jumping to S503.
S508, the tie switch SLi is transferred to the minimum section of the supply band lower stage of the switching device SS (k-1).
S600, aiming at load balance of all the connection lines, solving an optimal operation mode through linear programming under the condition that optimization constraint conditions are met.
In the specific implementation process, aiming at load balancing of each connection line, solving the optimal operation mode by linear programming under the condition of meeting the optimization constraint condition comprises the following steps:
calculating the load balance degree of each reconstructed contact line:
determining optimization constraints of the connection line:
in the formula, LiThe real-time load of the line is,
rated load, T, of line iminAnd TmaxRespectively representing maximum and minimum load limits, X, of a main transformer in a power distribution network lineiImpedance of the ith line; l. the(i)、x(i)The length of each section of line and the impedance value, X, of the unit length of the corresponding wire in the longest path of the ith line supplied through the interconnection switchi+∑x(i)l(i)The impedance value of the tail end of the ith line after reconstruction is obtained;
the maximum impedance value is obtained by reduction under the minimum operation mode of the system according to the time-limited current quick-break protection setting value of the line i;
and performing linear programming based on the smaller the optimization constraint condition and the load balance degree, and solving the optimal supply and take subordinate minimum sectional load of each switching device.
Example 2
Referring to fig. 7, an embodiment of the present invention provides a device for implementing network reconfiguration of a distribution network, including: the power distribution network transfer network reconfiguration method comprises a processing unit, a storage unit, a bus unit, an input unit and a display unit, wherein the bus unit is connected with the processing unit, the storage unit, the input unit and the display unit, the storage unit stores at least one instruction, and the processing unit reads and executes the instruction to realize the power distribution network transfer network reconfiguration method.
Example 3
The embodiment of the invention provides a storage medium for realizing the reconstruction of a power distribution network transfer network, wherein the storage medium for realizing the reconstruction of the power distribution network transfer network stores at least one instruction, reads and executes the instruction, and realizes the reconstruction method of the power distribution network transfer network.
In the embodiments provided in the present invention, it should be understood that the disclosed apparatus and method can be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one position, or may be distributed on multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.
The foregoing are merely exemplary embodiments of the present invention, which enable those skilled in the art to understand or practice the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (9)
1. A power distribution network transfer network reconstruction method is characterized by comprising the following steps:
collecting the grid structure information of a power distribution network where a circuit needing to be transferred is located;
constructing a corresponding power distribution network contact line model based on the equipment ordered tree model according to the power distribution network frame structure information of the line needing to be transferred;
judging whether the line needing to be transferred is a single interconnection line in the power distribution network interconnection line model;
if so, determining a transferable interval of the line to be transferred according to the load margin of the connection line corresponding to the line to be transferred and the section load of the line to be transferred;
otherwise, determining the supportable supply section of each interconnection switch by combining the interconnection switch load on each interconnection line, the supply and take lower-stage minimum sectional load of each switch device on the supply and take-over line and the topological structure of the distribution network interconnection line model;
and (4) aiming at load balance of each connection line, and solving the optimal operation mode by linear programming under the condition of meeting the optimization constraint condition.
2. The method for reconstructing a distribution network-to-network according to claim 1, wherein the device ordered tree model comprises: representing the root of the power supply, representing the nodes of the switching device, representing the line segments of the line.
3. The method for reconstructing the network transferred to the power distribution network according to claim 1, wherein the step of determining the transferable region of the line to be transferred according to the load margin of the contact line corresponding to the line to be transferred and the section load of the line to be transferred comprises the following steps of:
determining a connection line corresponding to a line needing to be transferred;
calculating the load margin of the interconnection line by subtracting the real-time load of the interconnection line from the rated load of the interconnection line;
calculating section loads between each section switch and the interconnection switch on the main path of the circuit to be supplied;
and taking the section of the line needing to be transferred and supplied with the section load smaller than the load margin as a transferable section of the line needing to be transferred and supplied.
4. The method for reconstructing the distribution network transfer network according to claim 1, wherein the determining the supported transferable regions of each interconnection switch by combining the load of the interconnection switch on each interconnection line, the supply band subordinate minimum section load of each switching device on the supply-required transfer line and the topology of the distribution network connection line model comprises:
traversing interconnection switches SL1, SL2, … and SLn between the circuit to be switched and each interconnection circuit, and determining n main paths from each interconnection switch to the power supply of the circuit to be switched;
traversing the switch devices along each main path from the interconnection switch, and calculating the residual load margin of each interconnection switch load after the interconnection switch load passes through the minimum sectional load of each switch device on the supply lower stage;
and selecting the interconnection switch for switching the equipment switches according to the maximum value of the residual load margin of each branch switch supported by each interconnection switch load so as to determine the switching range supported by each interconnection switch.
5. The method according to claim 4, wherein calculating the minimum segment load of each switching device under the supply band comprises:
acquiring real-time loads of each switching device;
if the switching equipment is a section switch, calculating the minimum section load of the switching equipment at the lower level according to the real-time load of each switching equipment and the topological position of the switching equipment in the power distribution network connection line model: l'SSk＝LSSk-LSS(k-1)；
Wherein, L'SSkIndicating the minimum section load of the supply subordinate of the switching device SSk, LSSkRepresenting the real-time load, L, of the switching device SSkSS(k-1)Represents the real-time load of the switching device SS (k-1);
if the switchgear is an end switch, the supply of the switchgear carries the lowest section load of the lower level: l'SSk＝LSSk。
6. The method for reconstructing a distribution network of claim 4, wherein the following formula is adopted: m[SL,SSk]＝M-(L′SS1+L′SS2+…+L′SSk) And calculating the residual load margin of each interconnection switch load after the interconnection switch load passes through the minimum sectional load of each switching device for carrying the next stage, wherein M represents the load provided by the interconnection switch.
7. The power distribution network transfer network reconstruction method according to claim 1, wherein aiming at load balancing of each connection line, solving the optimal operation mode by linear programming under the condition of meeting optimization constraint conditions comprises the following steps:
calculating the load balance degree of each reconstructed contact line:
determining optimization constraints of the connection line:
in the formula, LiThe real-time load of the line is,
rated load, T, of line iminAnd TmaxRespectively representing maximum and minimum load limits, X, of a main transformer in a power distribution network lineiImpedance of the ith line; l(i)、x(i)The length of each section of line and the impedance value, X, of the unit length of the corresponding wire in the longest path of the ith line supplied through the interconnection switchi+∑x(i)l(i)The impedance value of the tail end of the ith line after reconstruction is obtained;
the maximum impedance value is obtained by reduction under the minimum operation mode of the system according to the time-limited current quick-break protection setting value of the line i;
and performing linear programming based on the smaller the optimization constraint condition and the load balance degree is, and solving the optimal supply and take lower-level minimum sectional load of each switching device.
8. The utility model provides a realize distribution network and transfer device that supplies network reconsitution which characterized in that includes: the power distribution network transfer network reconfiguration method comprises a processing unit, a storage unit, a bus unit, an input unit and a display unit, wherein the bus unit is connected with the processing unit, the storage unit, the input unit and the display unit, the storage unit stores at least one instruction, and the processing unit reads and executes the instruction to realize the power distribution network transfer network reconfiguration method according to any one of claims 1 to 7.
9. A storage medium for realizing the reconstruction of the network transferred from the power distribution network to the network, wherein the storage medium for realizing the reconstruction of the network transferred from the power distribution network stores at least one instruction, reads and executes the instruction, and realizes the reconstruction method of the network transferred from the power distribution network according to any one of claims 1 to 7.
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| CN115207926A (en) * | 2022-09-15 | 2022-10-18 | 广东电网有限责任公司湛江供电局 | Method and related device for measuring and calculating transferable power supply capacity of medium-voltage line of power distribution network |
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| CN115207926A (en) * | 2022-09-15 | 2022-10-18 | 广东电网有限责任公司湛江供电局 | Method and related device for measuring and calculating transferable power supply capacity of medium-voltage line of power distribution network |
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