CN116915690B - Power distribution line transmission efficiency evaluation method and system of passive tree topology - Google Patents
Power distribution line transmission efficiency evaluation method and system of passive tree topology Download PDFInfo
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- H—ELECTRICITY
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- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/02—Topology update or discovery
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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
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/12—Shortest path evaluation
- H04L45/122—Shortest path evaluation by minimising distances, e.g. by selecting a route with minimum of number of hops
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
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- H04L45/123—Evaluation of link metrics
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- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
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Abstract
The invention discloses a method and a system for evaluating transmission efficiency of a distribution line of a passive tree topology, wherein the method comprises the following steps: acquiring a section of distribution line comprising a power source and a plurality of loads, wherein the power source is used for carrying out power transmission on the loads; mapping the distribution lines to corresponding grids according to grid point coordinates, and constructing a plurality of power supply line networks with different topological structures according to the distribution of power supplies and loads; acquiring power from the power supply to each load in the power supply circuit network, and calculating equivalent load distance of each circuit relative to the power supply; and comparing the magnitudes of the equivalent load distances, finding out the equivalent load distance with the minimum value, and taking the corresponding line as the topological structure with the minimum transmission cost. According to the invention, the optimal network topology power supply mode exists in the distribution network structure, and the load can evaluate the advantages and disadvantages of different topology power supplies, and the network topology is evaluated by adopting an equivalent load distance method, so that the invention has the advantages of comprehensiveness and convenience.
Description
Technical Field
The invention relates to the technical field of distribution line transmission, in particular to a distribution line transmission efficiency evaluation method and system of a passive tree topology.
Background
The transmission efficiency of the distribution network is an important index for reflecting the topology structure of the network, but the main technical direction is to improve the transmission efficiency at present, for example, the application with the application number of CN201310701284.2, which improves the transmission efficiency by adding a mark on the transmitting end and the receiving end. The transmission efficiency is evaluated by adopting what parameters, which is too complicated at present, and the structural advantages, transmission efficiency and network transmission cost of the network topology can not be clearly reflected.
Disclosure of Invention
The invention aims to: in order to overcome the defects of the prior art, the invention provides a method for evaluating the transmission efficiency of a distribution line of a passive tree topology, which is used for evaluating the transmission efficiency of the distribution line.
The technical scheme is as follows: in one aspect, the invention provides a method for evaluating transmission efficiency of a distribution line of a passive tree topology, which comprises the following steps:
s1, acquiring a section of distribution line comprising a power supply and a plurality of loads, wherein the power supply is used for carrying out power transmission on the loads;
s2, mapping the distribution lines to corresponding grids according to grid point coordinates, and constructing a plurality of power supply line networks with different topological structures according to the distribution of power supplies and loads;
s3, acquiring power from the power supply to each load in the power supply circuit network, and calculating equivalent load distance of each circuit relative to the power supply; the circuit from the power supply to each load in the circuit network comprises a serial circuit, a local parallel circuit and a parallel circuit, wherein the serial circuit is that only a serial relation exists between the power supply and other loads, the local parallel circuit is that both a parallel relation and a serial relation exist between the power supply and other loads, and the parallel circuit is that only a parallel relation exists between the power supply and other loads;
s4, comparing the magnitudes of the equivalent load distances, finding out the equivalent load distance with the smallest value, and taking the corresponding line as the topological structure with the smallest transmission cost.
Further, the method comprises the steps of:
the step of calculating the equivalent load distance under the series relation comprises the following steps:
s31, if the serial circuit is that one power supply and two loads are in serial relation, calculating corresponding equivalent loadsDistance from power supplydThe calculation formula is as follows:the method comprises the steps of carrying out a first treatment on the surface of the Wherein (1)>For the length of the line between the first load and the power supply, < > for>For the length of the line between the second load and the power supply, < > for>For the power corresponding to the second load, +.>The power corresponding to the first load;
s32 if the serial circuit is a power supply and more than two loads are in serial relation, the loads are recorded asWherein->The distance between the corresponding equivalent load and the power supplyd e The method comprises the following specific steps of:
s321 calculate the firstnLoad and the firstnEquivalent load distance between 1 loadExpressed as:wherein->Is the firstnPower of individual loads>Is the firstn-power of 1 load, +.>Is the firstnLoad and the firstnA line length between 1 load, said line length being a multiple of the grid side length,
s322 further sequentially calculatesAnd is also provided withTherefore, the method can be used for manufacturing the optical fiber,wherein->The length of the line from the power source to the load closest to the power source.
Further, the method comprises the steps of:
the calculation method of the equivalent load distance corresponding to the local parallel circuit comprises the following steps:
s33, carrying out equivalent treatment on load points which are far from a power supply end and are connected in series in the circuit to obtain a plurality of local equivalent load distancesd m ；
S34, if the local equivalent load and the original load point still have a serial connection relationship, continuing to iterate the equivalent processing to the power supply step by step until the local equivalent load and the original load point are all load points connected in parallel;
s35, confirming a plurality of load points with parallel connection, and calculating corresponding equivalent load distancesThe method comprises the steps of carrying out a first treatment on the surface of the S36 calculating equivalent load distance ∈ ->Wherein->The length of the line from the power source to the load closest to the power source.
Further, the method comprises the steps of:
the corresponding equivalent negatives are calculated in the step S35The distance of charge, the formula is:wherein->For the power corresponding to the Mth load, +.>For the load distance of the Mth load relative to the power supply, < >>For equivalent load after the equivalent processing in step S33,equivalent load distance corresponding to the equivalent load;
further, the method comprises the steps of:
the equivalent load distance calculation method corresponding to the parallel circuit comprises the following steps:
s37, confirming whether a load with a series connection relation exists in a circuit which is in a parallel connection relation with the power supply, and if the load with the series connection relation exists, carrying out equivalent processing on the load with the series connection relation;
s38, carrying out equivalent processing on the equivalent load in each line, and calculating to obtain a final equivalent load distanced t 。
On the other hand, the invention also provides an evaluation system of the transmission efficiency of the distribution line of the passive tree topology, which comprises:
the acquisition module is used for acquiring a section of distribution line comprising a power supply and a plurality of loads, wherein the power supply is used for carrying out power transmission on the loads;
the mapping module is used for mapping the distribution lines to corresponding grids according to grid point coordinates and constructing a plurality of power supply line networks with different topological structures according to the distribution of power supplies and loads;
the equivalent load distance calculation module is used for obtaining the power from the power supply to each load in the power supply circuit network and calculating the equivalent load distance of each circuit relative to the power supply; the circuit from the power supply to each load in the circuit network at least comprises one of a serial circuit, a local parallel circuit and a parallel circuit, wherein the serial circuit is that only a serial relation exists between the power supply and other loads, the local parallel circuit is that both a parallel relation and a serial relation exist between the power supply and other loads, and the parallel circuit is that only a parallel relation exists between the power supply and other loads;
the determining module is used for comparing the magnitudes of the equivalent load distances, finding out the equivalent load distance with the smallest value, and taking the corresponding line as the topological structure with the smallest transmission cost.
Further, the method comprises the steps of:
in the equivalent load distance calculation module, the calculation of the equivalent load distance under the series relation comprises the following units:
a first series unit for calculating the distance between the corresponding equivalent load and the power supply if the series circuit is a series relationship between one power supply and two loadsdThe calculation formula is as follows:the method comprises the steps of carrying out a first treatment on the surface of the Wherein (1)>For the length of the line between the first load and the power supply,for the length of the line between the second load and the power supply, < > for>For the power corresponding to the second load, +.>The power corresponding to the first load;
a second series unit for recording a plurality of loads as if the series circuit is a power supply and more than two loads are in series connectionWherein->The distance between the corresponding equivalent load and the power supplyd e The method comprises the following specific steps of:
calculate the firstnLoad and the firstnEquivalent load distance between 1 loadExpressed as:wherein->Is the firstnPower of individual loads>Is the firstn-power of 1 load, +.>Is the firstnLoad and the firstnA line length between 1 load, said line length being a multiple of the grid side length,
s322 further sequentially calculatesAnd is also provided withTherefore, the method can be used for manufacturing the optical fiber,wherein->The length of the line from the power source to the load closest to the power source. Further, the method comprises the steps of:
the calculating unit of the equivalent load distance corresponding to the local parallel circuit comprises:
a series load processing unit for connecting in series a negative load far from the power supply end in the lineThe load points are all subjected to equivalent processing to obtain a plurality of local equivalent load distancesd m ；
The iteration processing unit is used for continuing to iterate the power supply step by step to perform equivalent processing until the local equivalent load and the original load point are all load points connected in parallel if the local equivalent load and the original load point still have a serial connection;
the confirming unit is used for confirming a plurality of load points with parallel connection and calculating corresponding equivalent load distances;
a final calculation unit for calculating equivalent load distanceWherein->The length of the line from the power source to the load closest to the power source.
Further, the method comprises the steps of:
calculating the corresponding equivalent load distance in the confirmation unit, and expressing the equivalent load distance as the following formula:wherein->For the power corresponding to the Mth load, +.>For the load distance of the Mth load relative to the power supply, < >>Is equivalent load after equivalent processing in the series load processing unit, +.>Equivalent load distance corresponding to the equivalent load;
further, the method comprises the steps of:
the equivalent load distance calculation unit corresponding to the parallel circuit comprises:
the judging unit is used for judging whether loads in a series connection relation exist in a circuit which is in a parallel connection relation with the power supply, and if so, carrying out equivalent processing on the loads in the series connection relation;
a result calculation unit for performing equivalent processing on the equivalent load in each line, and calculating to obtain final equivalent load distanced t 。
The beneficial effects are that: the invention presumes the load of arbitrary distribution, arbitrary character, finish carrying on the power transmission to these loads with a power supply point, for different multiple topological structures, according to user's character different, its transmission efficiency, network transmission cost are different too, from the perspective of optimizing, should have the optimal network topology power supply mode, the load evaluates the different topological power supply's superiority and inferiority, have the advantage of comprehensiveness, convenience with the method of the equivalent load distance, adopt the mode of the equivalent load distance to evaluate the distribution line can clearly and accurately reflect the structural advantage, transmission efficiency and network transmission cost of the network topology.
Drawings
Fig. 1 is a flowchart of a method for evaluating transmission efficiency of a passive tree topology distribution line according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a grid structure according to an embodiment of the present invention;
FIG. 3 is a schematic diagram illustrating a section of distribution line mapped onto a grid according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a serial circuit according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a partial parallel circuit according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of a parallel circuit according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of a serial-type circuit equivalent processing procedure according to an embodiment of the present invention;
FIG. 8 is a schematic diagram of a partial parallel equivalent process according to an embodiment of the present invention;
FIG. 9 is a schematic diagram of a parallel circuit equivalent process according to an embodiment of the present invention;
FIG. 10 is a schematic diagram of a series basic cell according to an embodiment of the present invention;
fig. 11 is a schematic diagram of a parallel basic unit according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The load is the demand side of the energy source, and the distribution line is a specific topological form for meeting the energy source demand, and the load distance represents the product of the power and the distance from the point to the power source point for the load of a single point, and represents the transmission cost of the system for meeting the energy consumption demand of the point. The load distance in the invention is not just the distance of atomic level, but extends to complex networks. Because a specific distribution line generally needs to meet the energy consumption requirements of different characteristics distributed in different places, the topologies used for meeting the energy consumption requirements can be multiple, different topologies correspond to different transmission efficiencies, but the energy consumption requirements are the same, and from the perspective of input and output, the transmission efficiencies of different topologies have certain differences, if a plurality of distributed load points are equivalent to one logical load point, namely, in a certain section of line, the energy consumption requirements required by actual loads are the same as the energy consumption requirements required by the corresponding loads after the equivalent, so the equivalent loads correspond to load distances with different lengths in the corresponding topologies, and in principle are similar to the moment synthesis, then, similar, different topologies correspond to equivalent load distances with different lengths, and therefore, the equivalent load distances can be used for representing the transmission efficiencies of different topologies.
Accordingly, as shown in fig. 1, in one aspect, the present invention provides a method for evaluating transmission efficiency of a distribution line of a passive tree topology, the method comprising the steps of:
s1, a section of distribution line containing a power source and a plurality of loads is obtained, wherein the power source is used for carrying out power transmission on the loads, and the invention considers a distribution line structure with unchanged direction and no loop
S2, mapping the distribution lines to corresponding grids according to grid point coordinates, and constructing a plurality of power supply line networks with different tree-shaped topological structures according to the distribution of power supplies and loads;
s3, acquiring power from the power supply to each load in the power supply circuit network, and calculating equivalent load distance of each circuit relative to the power supply; the circuit from the power supply to each load in the circuit network comprises a serial circuit, a local parallel circuit and a parallel circuit, wherein the serial circuit is that only a serial relation exists between the power supply and other loads, the local parallel circuit is that both a parallel relation and a serial relation exist between the power supply and other loads, and the parallel circuit is that only a parallel relation exists between the power supply and other loads.
For the series basic units and the equivalent diagram in the series relation as shown in FIG. 10, the circuit in the invention is a constant voltage network and satisfiesMultiplying the power factor, therefore, the present invention unifies +.>Equivalent write->Thus, for a series case, two loads P 1 And P 2 As shown in fig. 10, the equivalent load distance can be calculated by a method in which the arrow direction is the direction of the tide and +.>The method comprises the steps of carrying out a first treatment on the surface of the Specifically, the right side of the first formula is the actual energy demand amount, and as can be seen from fig. 10, the energy is supplied to P 1 Is +.>Through P 2 Is +.>Therefore, the total demand on the right side is +.>The corresponding left side is equivalent state, because the two charges are equivalent to one, the current flowing is +.>Thus, the energy demand represented on the left side is represented as: />Therefore, the equivalent line d is expressed as: />Correspondingly, in the present invention, due to the limitation of certain conditionsiReplaced by corresponding powerp。
Therefore, the calculation formula is:the method comprises the steps of carrying out a first treatment on the surface of the Wherein (1)>For the length of the line between the first load and the power supply, i.e. the corresponding load distance, +.>For the length of the line between the second load and the power supply, the load distance corresponding to the second charge, +.>For the power corresponding to the second load, +.>The power corresponding to the first load.
For the parallel basic units and the equivalent diagram in the parallel relation as shown in FIG. 11, forIn the case of parallel connection, N loads P1 to PN, the equivalent load distance can be calculated by:the method comprises the steps of carrying out a first treatment on the surface of the Wherein N is in parallel with the exception of P 1 The total load number of other nodes in combination,d n is the firstnThe load distance corresponding to the equivalent load,p n is the firstnThe power corresponding to the equivalent load. In actual calculation, the nodes are calculated, and the series connection is calculated by the previous node of one node, so the number of the nodes is two, and the parallel connection is calculated by combining all parallel nodes under the nodes. Based on the above, the step of calculating the equivalent load distance in the series relationship includes:
s31, if the serial circuit is that one power supply and two loads are in serial relation, calculating the distance between the corresponding equivalent load and the power supplydThe calculation formula is as follows:the method comprises the steps of carrying out a first treatment on the surface of the Wherein (1)>For the length of the line between the first load and the power supply, i.e. the distance of the load corresponding to the first load, +.>For the length of the line between the second load and the power supply, < > for>For the power corresponding to the second load, +.>The power corresponding to the first load; from the formula, the load distance of the equivalent loaddIs greater than->. S32 if the serial circuit is a power supply and more than two loads are in serial relationship, the loads are marked as +.>Wherein->The distance between the corresponding equivalent load and the power supplyd e The method comprises the following specific steps of:
s321 calculate the firstnLoad and the firstnEquivalent load distance between 1 loadExpressed as:wherein->Is the firstnPower of individual loads>Is the firstn-power of 1 load, +.>Is the firstnLoad and the firstn-a line length between 1 load, said line length being a multiple of the grid side length;
s322 further sequentially calculatesAnd (2) andtherefore, the method can be used for manufacturing the optical fiber,wherein->The length of the line from the power supply to the load closest to the power supply is denoted as the precursor line segment.
Further, the method comprises the steps of:
the calculation method of the equivalent load distance corresponding to the local parallel circuit comprises the following steps:
s33, carrying out equivalent treatment on load points which are far from a power supply end and are connected in series in the circuit to obtain a plurality of local equivalent load distancesd m ；
S34, if the local equivalent load and the original load point still have a serial connection relationship, continuing to iterate the equivalent processing to the power supply step by step until the local equivalent load and the original load point are all load points connected in parallel;
s35, confirming a plurality of load points with parallel connection, and calculating corresponding equivalent load distances;
s36 calculating equivalent load distanceWherein->The length of the line from the power source to the load closest to the power source.
In step S35, the corresponding equivalent load distance is calculated, and the formula is expressed as:the method comprises the steps of carrying out a first treatment on the surface of the Wherein (1)>For the power corresponding to the Mth load, +.>For the load distance of the Mth load relative to the power supply, < >>For equivalent load after equivalent processing in step S33, < ->Equivalent load distance corresponding to the equivalent load;
the equivalent load distance calculation method corresponding to the parallel circuit comprises the following steps:
s37, confirming whether a load with a series connection relation exists in a circuit which is in a parallel connection relation with the power supply, and if the load with the series connection relation exists, carrying out equivalent processing on the load with the series connection relation;
s38 equivalent in each lineThe load is subjected to equivalent processing, and the final equivalent load distance is obtained through calculation。
S4, comparing the magnitudes of the equivalent load distances, finding out the equivalent load distance with the smallest value, and taking the corresponding line as the topological structure with the smallest transmission cost. I.e. comparing the final equivalent load distances as described above.
For a complex 10kV feeder line network, gradually and forwards calculating from the terminal node, gradually merging to a power supply point, and calculating corresponding equivalent load distances, and judging the transmission efficiency of a distribution network feeder line through the equivalent load distances, wherein the shorter the equivalent load distance is, the higher the transmission efficiency is, and the larger the equivalent load distance is, the lower the corresponding transmission efficiency is.
Specific examples are as follows: for practical distribution networks, the distribution relationship between different substation distribution points and the gradually developed loads has a certain degree of uncertainty. Assuming that the power source S and the load are distributed at the intersections of the nine squares shown in fig. 2, for a certain given source load distribution pattern, power supply networks with different topologies can be constructed, and of course, different transmission efficiencies are also corresponding.
If the power source S is arranged in the upper left corner, four equal-sized loads P 1 ~P 4 Respectively arranged at four crossing points of the lower right corner, as shown in fig. 3, a series type power supply network as shown in fig. 4, a partial parallel type power supply network as shown in fig. 5, and a more thorough parallel type power supply network as shown in fig. 6 may be respectively constructed in order to satisfy the power supply demands of 4 load points. Making the side length of each basic grid bed，P 1 ~P 4 The transmission efficiency of the three topologies of fig. 4 to 6 is analyzed separately.
As shown in fig. 7, the transmission efficiency of the network shown in fig. 4 is obtained in three steps to obtain an equivalent load distance, which specifically includes: first, combiningP 1 、P 2 Obtaining local equivalent load distanced 12 Since the direction of the equivalent load is gradually approachingThe power supply, and therefore,P 1 、P 2 is the slave in the equivalent load directionP 1 To the point ofP 2 Therefore, the method can be used for manufacturing the optical fiber,P 2 the corresponding load distance is 0 and the load distance is 0,P 1 the corresponding load distance is d, and the specific equivalent load distanceHow much is according toP 1 、P 2 The second step is based on the first step, similarly, the merging processP 4 Obtaining local equivalent load distanced 124 The third step is based on the previous two steps, combiningP 3 Obtaining local equivalent load distanced 1234 Finally, the final equivalent load distance of the counted precursor line segment is obtainedd e 。
The specific calculation process is as follows:，，，. Obviously, in the final equivalent load distance expression, the former term expresses the common line segment of all load points, and the latter term expresses the strength of the coupling relation between the related load points, and generally expresses the overall transmission cost for meeting the requirements of four load points, namelyd e The smaller the value of (c) the lower the transmission cost to the system.
As shown in fig. 8, the transmission efficiency of the network shown in fig. 5 may be divided into two similar equivalent steps, but the contents of local equivalents are also different due to the change of the topology, and the specific process is as follows:
wherein, in the first step, two load points connected in series are combined and processedP 3 AndP 4 obtaining a local partEquivalent load distance of (2)d 34 The second step is based on the first step to combine and process three parallel load pointsP 1 、P 2 、P 34 Obtaining local equivalent load distanced 1234 Finally obtaining the final equivalent load distance of the calculated precursor line segmentd e . The specific calculation process is as follows:，，. Obviously, in the final equivalent load distance expression, the former term also expresses the common line segment of all load points, and the latter term expresses the strength of the coupling relation between the relevant load points, so that the transmission cost of the network shown in fig. 5 is smaller than the transmission cost of the network shown in fig. 4, namely, the transmission efficiency of the network shown in fig. 5 is due to the network shown in fig. 4.
The equivalent load distance of the network described in fig. 6 can also follow the principle of local equivalent and then gradually iterating to the source end. It should be noted that, in the local equivalent processing, a plurality of simple parallel load points may be completed in one step, and for a load point including a series connection, two load points in series connection must be equivalent to one load point first and then iterated gradually with adjacent load points. The network shown in fig. 6 includes 4 load points, which can be iterated in two according to the topology, as shown in fig. 9, and the specific procedure is as follows:，，. In summary, the equivalent load distance of the network shown in fig. 6 is the smallest, that is, the transmission cost is the smallest among the three, and the transmission efficiency is the best.
On the other hand, the invention also provides an evaluation system of the transmission efficiency of the distribution line of the passive tree topology, which comprises:
the acquisition module is used for acquiring a section of distribution line comprising a power supply and a plurality of loads, wherein the power supply is used for carrying out power transmission on the loads;
the mapping module is used for mapping the distribution lines to corresponding grids according to grid point coordinates and constructing a plurality of power supply line networks with different topological structures according to the distribution of power supplies and loads;
the equivalent load distance calculation module is used for obtaining the power from the power supply to each load in the power supply circuit network and calculating the equivalent load distance of each circuit relative to the power supply; the circuit from the power supply to each load in the circuit network at least comprises one of a serial circuit, a local parallel circuit and a parallel circuit, wherein the serial circuit is that only a serial relation exists between the power supply and other loads, the local parallel circuit is that both a parallel relation and a serial relation exist between the power supply and other loads, and the parallel circuit is that only a parallel relation exists between the power supply and other loads;
the determining module is used for comparing the magnitudes of the equivalent load distances, finding out the equivalent load distance with the smallest value, and taking the corresponding line as the topological structure with the smallest transmission cost.
In the equivalent load distance calculation module, the calculation of the equivalent load distance under the series relation comprises the following units:
a first series unit for calculating the distance between the corresponding equivalent load and the power supply if the series circuit is a series relationship between one power supply and two loadsdThe calculation formula is as follows:the method comprises the steps of carrying out a first treatment on the surface of the Wherein (1)>For the length of the line between the first load and the power supply,for the length of the line between the second load and the power supply, < > for>For the power corresponding to the second load, +.>The power corresponding to the first load; a second series unit for providing a series connection between one power supply and more than two loads, the loads being ∈>Wherein->The distance between the corresponding equivalent load and the power supplyd e The method comprises the following specific steps of: calculate the firstnLoad and the firstn-equivalent load distance between 1 load +.>Expressed as:wherein->Is the firstnPower of individual loads>Is the firstn-power of 1 load, +.>Is the firstnLoad and the firstnA line length between 1 load, said line length being a multiple of the grid side length,
and then sequentially calculateAnd (2) andtherefore, the method can be used for manufacturing the optical fiber,wherein->The length of the line from the power supply to the load closest to the power supply is denoted as the precursor line segment.
The calculating unit of the equivalent load distance corresponding to the local parallel circuit comprises:
the series load processing unit is used for carrying out equivalent processing on load points which are far from the power supply end and are connected in series in the circuit to obtain a plurality of local equivalent load distancesd m ；
The iteration processing unit is used for continuing to iterate the power supply step by step to perform equivalent processing until the local equivalent load and the original load point are all load points connected in parallel if the local equivalent load and the original load point still have a serial connection;
the confirming unit is used for confirming a plurality of load points with parallel connection and calculating corresponding equivalent load distances;
a final calculation unit for calculating equivalent load distanceWherein->The length of the line from the power source to the load closest to the power source.
Calculating the corresponding equivalent load distance in the confirmation unit, and expressing the equivalent load distance as the following formula:the method comprises the steps of carrying out a first treatment on the surface of the Wherein (1)>For the power corresponding to the Mth load, +.>For the load distance of the Mth load relative to the power supply, < >>Is equivalent load after equivalent processing in the series load processing unit, +.>Equivalent load distance corresponding to the equivalent load; the equivalent load distance calculation unit corresponding to the parallel circuit comprises:
the judging unit is used for judging whether loads in a series connection relation exist in a circuit which is in a parallel connection relation with the power supply, and if so, carrying out equivalent processing on the loads in the series connection relation;
a result calculation unit for performing equivalent processing on the equivalent load in each line, and calculating to obtain final equivalent load distanced t 。
Other technical features of the evaluation system are the same as those of the evaluation method, and the invention is not repeated here.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various modifications and variations can be made to the embodiments of the present invention without departing from the spirit or scope of the embodiments of the invention. Thus, if such modifications and variations of the embodiments of the present invention fall within the scope of the claims and the equivalents thereof, the present invention is also intended to include such modifications and variations.
Claims (2)
1. The method for evaluating the transmission efficiency of the distribution line of the passive tree topology is characterized by comprising the following steps of:
s1, acquiring a section of distribution line comprising a power supply and a plurality of loads, wherein the power supply is used for carrying out power transmission on the loads;
s2, mapping the distribution lines to corresponding grids according to grid point coordinates, and constructing a plurality of power supply line networks with different topological structures according to the distribution of power supplies and loads;
s3, acquiring power from the power supply to each load in the power supply circuit network, and calculating equivalent load distance of each circuit relative to the power supply; the circuit from the power supply to each load in the circuit network comprises a serial circuit, a local parallel circuit and a parallel circuit, wherein the serial circuit is that only a serial relation exists between the power supply and other loads, the local parallel circuit is that both a parallel relation and a serial relation exist between the power supply and other loads, and the parallel circuit is that only a parallel relation exists between the power supply and other loads;
s4, comparing the magnitudes of the equivalent load distances, finding out the equivalent load distance with the smallest value, and taking the corresponding line as the topological structure with the smallest transmission cost;
the step of calculating the equivalent load distance under the series relation comprises the following steps:
s31, if the serial circuit is that one power supply and two loads are in serial relation, calculating the distance between the corresponding equivalent load and the power supplydThe calculation formula is as follows:the method comprises the steps of carrying out a first treatment on the surface of the Wherein (1)>For the length of the line between the first load and the power supply, < > for>For the length of the line between the second load and the power supply, < > for>For the power corresponding to the second load, +.>The power corresponding to the first load; s32 if the serial circuit is a power supply and more than twoThe loads are all in series connection, and the loads are marked as +.>Wherein->The distance between the corresponding equivalent load and the power supply +.>The method comprises the following specific steps of:
s321 calculate the firstnLoad and the firstnEquivalent load distance between 1 loadExpressed as:wherein->Is the firstnPower of individual loads>Is the firstn-power of 1 load, +.>Is the firstnLoad and the firstn-a line length between 1 load, said line length being a multiple of the grid side length, S322 in turn calculating +.>And (2) andtherefore, the method can be used for manufacturing the optical fiber,wherein->A line length for a power source to a load closest to the power source;
the calculation method of the equivalent load distance corresponding to the local parallel circuit comprises the following steps:
s33, carrying out equivalent treatment on load points which are far from a power supply end and are connected in series in the circuit to obtain a plurality of local equivalent load distancesd m ；
S34, if the local equivalent load and the original load point still have a serial connection relationship, continuing to iterate the equivalent processing to the power supply step by step until the local equivalent load and the original load point are all load points connected in parallel;
s35, confirming a plurality of load points with parallel connection, and calculating corresponding equivalent load distances；
S36 calculating equivalent load distanceWherein->A line length for a power source to a load closest to the power source;
in the step S35, the corresponding equivalent load distance is calculated, and the formula is expressed as:wherein->For the power corresponding to the Mth load, +.>For the load distance of the Mth load relative to the power supply, < >>For equivalent load after equivalent processing in step S33, < ->Equivalent load distance corresponding to the equivalent load;
the equivalent load distance calculation method corresponding to the parallel circuit comprises the following steps:
s37, confirming whether a load with a series connection relation exists in a circuit which is in a parallel connection relation with the power supply, and if the load with the series connection relation exists, carrying out equivalent processing on the load with the series connection relation;
s38, carrying out equivalent processing on the equivalent load in each line, and calculating to obtain a final equivalent load distanced t 。
2. A passive tree topology distribution line transmission efficiency evaluation system, the system comprising:
the acquisition module is used for acquiring a section of distribution line comprising a power supply and a plurality of loads, wherein the power supply is used for carrying out power transmission on the loads;
the mapping module is used for mapping the distribution lines to corresponding grids according to grid point coordinates and constructing a plurality of power supply line networks with different topological structures according to the distribution of power supplies and loads;
the equivalent load distance calculation module is used for obtaining the power from the power supply to each load in the power supply circuit network and calculating the equivalent load distance of each circuit relative to the power supply; the circuit from the power supply to each load in the circuit network at least comprises one of a serial circuit, a local parallel circuit and a parallel circuit, wherein the serial circuit is that only a serial relation exists between the power supply and other loads, the local parallel circuit is that both a parallel relation and a serial relation exist between the power supply and other loads, and the parallel circuit is that only a parallel relation exists between the power supply and other loads;
the determining module is used for comparing the magnitudes of the equivalent load distances, finding out the equivalent load distance with the smallest value, and taking the corresponding line as the topological structure with the smallest transmission cost;
in the equivalent load distance calculation module, the calculation of the equivalent load distance under the series relation comprises the following units:
a first series unit for calculating the distance between the corresponding equivalent load and the power supply if the series circuit is a series relationship between one power supply and two loadsdThe calculation formula is as follows:the method comprises the steps of carrying out a first treatment on the surface of the Wherein (1)>For the length of the line between the first load and the power supply, < > for>For the length of the line between the second load and the power supply, < > for>For the power corresponding to the second load, +.>The power corresponding to the first load; a second series unit for providing a series connection between one power supply and more than two loads, the loads being ∈>Wherein->The distance between the corresponding equivalent load and the power supplyd e The method comprises the following specific steps of:
calculate the firstnLoad and the firstnEquivalent load distance between 1 loadExpressed as:wherein->Is the firstnPower of individual loads>Is the firstn-power of 1 load, +.>Is the firstnLoad and the firstn-a line length between 1 load, said line length being a multiple of the grid side length, and further calculating +.>And (2) andtherefore, the method can be used for manufacturing the optical fiber,wherein (1)>A line length for a power source to a load closest to the power source;
the calculating unit of the equivalent load distance corresponding to the local parallel circuit comprises:
the series load processing unit is used for carrying out equivalent processing on load points which are far from the power supply end and are connected in series in the circuit to obtain a plurality of local equivalent load distancesd m ；
The iteration processing unit is used for continuing to iterate the power supply step by step to perform equivalent processing until the local equivalent load and the original load point are all load points connected in parallel if the local equivalent load and the original load point still have a serial connection;
a confirmation unit for confirming a plurality of load points with parallel connection and calculating corresponding equivalent load distanceThe method comprises the steps of carrying out a first treatment on the surface of the A final calculation unit for a meterCalculating equivalent load distance->Wherein->A line length for a power source to a load closest to the power source;
calculating the corresponding equivalent load distance in the confirmation unit, and expressing the equivalent load distance as the following formula:wherein->For the power corresponding to the Mth load, +.>For the load distance of the Mth load relative to the power supply, < >>Is equivalent load after equivalent processing in the series load processing unit, +.>Equivalent load distance corresponding to the equivalent load; the equivalent load distance calculation unit corresponding to the parallel circuit comprises:
the judging unit is used for judging whether loads in a series connection relation exist in a circuit which is in a parallel connection relation with the power supply, and if so, carrying out equivalent processing on the loads in the series connection relation;
a result calculation unit for performing equivalent processing on the equivalent load in each line, and calculating to obtain final equivalent load distanced t 。
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