CN113507108A - Power distribution network line loss estimation method based on region division - Google Patents
Power distribution network line loss estimation method based on region division 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
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F17/00—Digital computing or data processing equipment or methods, specially adapted for specific functions
- G06F17/10—Complex mathematical operations
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F17/00—Digital computing or data processing equipment or methods, specially adapted for specific functions
- G06F17/10—Complex mathematical operations
- G06F17/18—Complex mathematical operations for evaluating statistical data, e.g. average values, frequency distributions, probability functions, regression analysis
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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
- H02J2203/10—Power transmission or distribution systems management focussing at grid-level, e.g. load flow analysis, node profile computation, meshed network optimisation, active network management or spinning reserve management
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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]
Abstract
A power distribution network line loss estimation method based on region division comprises the following steps: step 1: importing a geographic map layer shp file with coordinate information into line loss estimation software, wherein the shp file comprises an shp file of a residential building and an shp file of a road; step 2: analyzing the road map layer, generating a vectorization object for the road shp map layer, and generating a vertex object and an edge object; and step 3: dividing the geographical layer files according to areas; and 4, step 4: establishing a root node of a power supply unit according to longitude and latitude information of the transformer in each area, and determining a main power distribution feeder line of the power supply unit; and 5: and calculating the feeder line length from the branch to the load node in one area according to the correlation information of the residential building and the road. The ArcMap software is used for generating a network data set, and the obtained data is used as input in the software to calculate the length of the power distribution network line in the area, so that a large amount of manpower and material resources are saved, and the line loss condition of the power distribution network line can be accurately estimated.
Description
Technical Field
The invention relates to the technical field of power supply, in particular to a power distribution network line loss estimation method based on region division.
Background
With the continuous deepening of the electric power reform work implemented nationwide, the loss reduction and efficiency improvement consciousness of power supply enterprises under the national market economic system is continuously improved, the power distribution network loss calculation and analysis are important work of the power supply enterprises, the benefits of the power supply enterprises are influenced, the implementation situation of the energy saving and emission reduction work is comprehensively reflected, and meanwhile, the scientific basis and the important content for the development of the energy saving and loss reduction work are also provided. Under the condition of energy shortage at present, the loss of a power distribution network is reduced by a scientific method, an energy-saving technology is developed, and the method has important significance for improving economic benefits of power supply companies.
The theoretical loss calculation method adopted by the existing power distribution network is more traditional, although the model is simple and the required data amount is small, the model is too simplified, the calculation result is low in precision, and the accurate calculation loss is difficult to obtain. Difficulty in calculating the length of the feed line: firstly, the method comprises the following steps: the actual geographic position of the transformer substation is uncertain, only the longitude and latitude of the transformer substation on a map are determined, and the specific position of the transformer substation is unclear; secondly, the method comprises the following steps: uncertainty of cell range, the range of each cell has no clear boundary on the map, and some deviation may occur during division; thirdly, the method comprises the following steps: the wiring disorder and the wiring condition of the power distribution network are not completely clear, and the map can not be clearly marked on a map and has no layer of a wiring network.
Disclosure of Invention
The invention aims to provide a simple and effective power distribution network line loss estimation method based on region division aiming at the defects of the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme: a power distribution network line loss estimation method based on region division comprises the following steps:
step 1: importing a geographic map layer shp file with coordinate information into line loss estimation software, wherein the shp file comprises an shp file of a residential building and an shp file of a road; the Shp file is a vector graphics format, and can describe geometric objects: points, polylines, polygons, etc. The Shp file stores a layer of geometric figures, such as lines, points, polygons, and is associated with a geographic coordinate system, which is a composite data set.
Step 2: analyzing the road map layer, generating a vectorization object for the road shp map layer, and generating a vertex object and an edge object;
and step 3: dividing the geographical layer files according to areas;
and 4, step 4: establishing a root node of a power supply unit according to longitude and latitude information of the transformer in each area, and determining a main power distribution feeder line of the power supply unit;
and 5: the method comprises the following steps of calculating the length of a feeder line from a branch to a load node in an area according to the association information of residential buildings and roads, wherein the calculation formula is as follows:
in the formula (1), L is the total length of the distribution feeder in the area, Ri is the length of the ith branch, and n is the total number of branches;
step 6: repeating the step 4 until the power distribution feeder calculation of the power supply units in each area is completed;
and 7: the total length of the feeder line in the power distribution network is counted, and the calculation formula is as follows:
in the formula (2), S is the length of a feeder line of a power distribution network, Mi is the length of an ith regional distribution bus, Li is the total length of the ith regional distribution feeder line, n is the total number of divided regions, and i is divided into n regions from 1 to n in total;
and 8: obtaining an actual resistance value by combining with a physical structure of a feeder line, and solving a line equivalent resistance; the line equivalent resistance calculation formula is as follows:
in formula (3), Rm is the equivalent resistance of the line, IKIs the average current, R, flowing through the kth branchkIs the real resistance value of the kth branch, Ij headThe average current at the head end of the line is m, and the total number of branches is m;
and step 9: the line loss condition of the feeder network is calculated by using an average current method, and the calculation formula is as follows:
in the formula (4), Δ a is loss electric quantity, R is feeder equivalent resistance, T is operation time, Iar is average current, and K is a shape coefficient.
Preferably, in step 2, the vertex object includes coordinate information, connection relation information, and associated parcel information.
Preferably, in step 2, the side object includes shape information, length information, road width information, related vertex information, and related parcel information.
Preferably, in step 5, the specific direction and length of the branch line in each region are calculated according to Dijkstra algorithm.
Preferably, in step 8, the average current of each load node is obtained by using the head end current of the line, the head end average current is obtained by using the head end electric quantity, and then the head end average current is distributed to each load node according to the ratio of the electric quantity of each load node to the head end electric quantity, so as to obtain the average current of the load node.
Preferably, the shape factor K is determined by the following formula:
wherein Ieff is the daily root mean current and Iar is the daily average current.
Preferably, in step 9, the magnitude of the shape factor K is related to the linearly varying continuous load curve, and can be calculated by the following formula:
when f is more than or equal to 0.5, K is calculated2：
When f is<At 0.5, calculate K2：
In the formula, alpha is the minimum load factor and is equal to the ratio of the minimum current to the maximum current; f is the load factor, which is equal to the ratio of the average current to the maximum current.
Preferably, in step 9, the actual measurement results include active power, reactive power, voltage and average current, which are calculated by the following formulas: :
in the formula, Aa is daily active electric quantity, Ar is daily reactive electric quantity, and Uar is daily average voltage value; the electric energy loss calculation formula is as follows:
in the formula, AaIs daily active electric quantity, ArIs daily reactive electric quantity, UarIs the daily average voltage value, R is the equivalent resistance of the feed line, and T is the running time
By adopting the technical scheme of the invention, the invention has the beneficial effects that: compared with the prior art, the method has the advantages that on the premise that the station position and the resident building position are determined, the ArcMap software is used for generating the network data set, the obtained data is used as input in the software to calculate the length of the power distribution network line in the area, and therefore a large amount of manpower and material resources are saved, and the line loss condition of the power distribution network line can be accurately estimated.
Detailed Description
Preferred embodiments of the present invention are described. A power distribution network line loss estimation method based on region division comprises the following steps:
step 1: importing a geographic map layer shp file with coordinate information into line loss estimation software, wherein the shp file comprises an shp file of a residential building and an shp file of a road;
step 2: analyzing the road map layer, generating a vectorization object for the road shp map layer, and generating a vertex object and an edge object;
and step 3: dividing the geographical layer files according to areas;
and 4, step 4: establishing a root node of a power supply unit according to longitude and latitude information of the transformer in each area, and determining a main power distribution feeder line of the power supply unit;
and 5: the method comprises the following steps of calculating the length of a feeder line from a branch to a load node in an area according to the association information of residential buildings and roads, wherein the calculation formula is as follows:
in the formula (1), L is the total length of the distribution feeder in the area, Ri is the length of the ith branch, and n is the total number of branches;
step 6: repeating the step 4 until the power distribution feeder calculation of the power supply units in each area is completed;
and 7: the total length of the feeder line in the power distribution network is counted, and the calculation formula is as follows:
in the formula (2), S is the length of a feeder line of a power distribution network, Mi is the length of an ith regional distribution bus, Li is the total length of the ith regional distribution feeder line, n is the total number of divided regions, and i is divided into n regions from 1 to n in total;
and 8: obtaining an actual resistance value by combining with a physical structure of a feeder line, and solving a line equivalent resistance; the line equivalent resistance calculation formula is as follows:
in formula (3), Rm is the equivalent resistance of the line, IKIs the average current, R, flowing through the kth branchkIs the real resistance value of the kth branch, Ij headThe average current at the head end of the line is m, and the total number of branches is m;
and step 9: the line loss condition of the feeder network is calculated by using an average current method, and the calculation formula is as follows:
in the formula (4), Δ a is loss electric quantity, R is feeder equivalent resistance, T is operation time, Iar is average current, and K is a shape coefficient.
2. The method according to claim 1, wherein in step 2, the vertex object includes coordinate information, connection relation information, and associated parcel information.
Further, in step 2, the side object includes shape information, length information, road width information, associated vertex information, and associated parcel information.
Further, in step 5, the specific direction and length of the branch line in each region are calculated according to the Dijkstra algorithm.
Further, in step 8, the average current of each load node is obtained by using the head end current of the line, the head end average current is obtained by using the head end electric quantity, and then the head end average current is distributed to each load node according to the proportion of the electric quantity of each load node to the head end electric quantity, so that the average current of the load node is obtained.
Further, in step 9, the shape factor K is determined by the following formula:
wherein Ieff is the daily root mean current and Iar is the daily average current.
Further, in step 9, the magnitude of the shape coefficient K is related to the linearly varying continuous load curve, and can be calculated by the following formula:
when f is more than or equal to 0.5, K is calculated2：
When f is<At 0.5, calculate K2：
In the formula, alpha is the minimum load factor and is equal to the ratio of the minimum current to the maximum current; f is the load factor, which is equal to the ratio of the average current to the maximum current.
Further, in step 9, the actual measurement results include active power, reactive power, voltage, and average current, which are calculated according to the following formulas: :
in the formula, Aa is daily active electric quantity, Ar is daily reactive electric quantity, and Uar is daily average voltage value; the electric energy loss calculation formula is as follows:
in the formula, AaIs daily active electric quantity, ArIs daily reactive electric quantity, UarThe average daily voltage value is R, the equivalent resistance of the feeder line is R, and the running time is T.
The calculation method in step 5 is the Dijkstra algorithm.
Dijkstra's algorithm was proposed in 1959 by the netherlands computer scientist dikstra, and is therefore also called the dikstra algorithm. The Dijkstra algorithm is mainly characterized in that the Dijkstra algorithm is expanded to the outer layer by taking a starting point as the center until the expansion reaches a terminal point.
In step 9, since K is not easy to calculate, K can be selected according to a recommended theoretical calculation value in actual calculation, and the recommended value is as follows:
the above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by the present specification, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (8)
1. A power distribution network line loss estimation method based on region division is characterized by comprising the following steps:
step 1: importing a geographic map layer shp file with coordinate information into line loss estimation software, wherein the shp file comprises an shp file of a residential building and an shp file of a road;
step 2: analyzing the road map layer, generating a vectorization object for the road shp map layer, and generating a vertex object and an edge object;
and step 3: dividing the geographical layer files according to areas;
and 4, step 4: establishing a root node of a power supply unit according to longitude and latitude information of the transformer in each area, and determining a main power distribution feeder line of the power supply unit;
and 5: the method comprises the following steps of calculating the length of a feeder line from a branch to a load node in an area according to the association information of residential buildings and roads, wherein the calculation formula is as follows:
in the formula (1), L is the total length of the distribution feeder in the area, Ri is the length of the ith branch, and n is the total number of branches;
step 6: repeating the step 4 until the power distribution feeder calculation of the power supply units in each area is completed;
and 7: the total length of the feeder line in the power distribution network is counted, and the calculation formula is as follows:
in the formula (2), S is the length of a feeder line of a power distribution network, Mi is the length of an ith regional distribution bus, Li is the total length of the ith regional distribution feeder line, n is the total number of divided regions, and i is divided into n regions from 1 to n in total;
and 8: obtaining an actual resistance value by combining with a physical structure of a feeder line, and solving a line equivalent resistance; the line equivalent resistance calculation formula is as follows:
in formula (3), Rm is the equivalent resistance of the line, IKIs the average current, R, flowing through the kth branchkIs the real resistance value of the kth branch, Ij headThe average current at the head end of the line is m, and the total number of branches is m;
and step 9: the line loss condition of the feeder network is calculated by using an average current method, and the calculation formula is as follows:
in the formula (4), Δ a is loss electric quantity, R is feeder equivalent resistance, T is operation time, Iar is average current, and K is a shape coefficient.
2. The method according to claim 1, wherein in step 2, the vertex object includes coordinate information, connection relation information, and associated parcel information.
3. The method according to claim 1, wherein in step 2, the edge object comprises shape information, length information, road width information, associated vertex information, and associated parcel information.
4. The method for estimating the line loss of the power distribution network based on the regional division as claimed in claim 1, wherein in step 5, the specific direction and length of the branch line are calculated in each region according to Dijkstra algorithm.
5. The method as claimed in claim 1, wherein in step 8, the average current of each load node is obtained from the head end current of the line, the head end average current is obtained from the head end electricity quantity, and then the head end average current is distributed to each load node according to the ratio of the head end electricity quantity to the load node electricity quantity, so as to obtain the average current of the load node.
6. The method according to claim 1, wherein in step 9, the shape coefficient K is determined by the following formula:
wherein Ieff is the daily root mean current and Iar is the daily average current.
7. The method according to claim 1, wherein in step 9, the size of the shape coefficient K is related to the linearly varying continuous load curve, and is calculated according to the following formula:
when f is more than or equal to 0.5, K is calculated2：
When f is<At 0.5, calculate K2：
In the formula, alpha is the minimum load factor and is equal to the ratio of the minimum current to the maximum current; f is the load factor, which is equal to the ratio of the average current to the maximum current.
8. The method for estimating the line loss of the power distribution network based on the regional division according to claim 1, wherein in the step 9, the actual measurement results comprise active power, reactive power, voltage and average current, which are calculated according to the following formulas: :
in the formula, Aa is daily active electric quantity, Ar is daily reactive electric quantity, and Uar is daily average voltage value;
the electric energy loss calculation formula is as follows:
in the formula, AaIs daily active electric quantity, ArIs daily reactive electric quantity, UarThe average daily voltage value is R, the equivalent resistance of the feeder line is R, and the running time is T.
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