CN110570070B - Line loss sharing method and device for power transmission and distribution line - Google Patents

Line loss sharing method and device for power transmission and distribution line Download PDF

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CN110570070B
CN110570070B CN201810582770.XA CN201810582770A CN110570070B CN 110570070 B CN110570070 B CN 110570070B CN 201810582770 A CN201810582770 A CN 201810582770A CN 110570070 B CN110570070 B CN 110570070B
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branch
line loss
line
target node
theoretical
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CN110570070A (en
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蒋斌勇
郭成云
陈碧霞
袁君
陈卫文
赵勇
张洪宝
程启忠
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Petrochina Co Ltd
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
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    • G06Q30/0206—Price or cost determination based on market factors
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
    • G06Q50/00—Systems or methods specially adapted for specific business sectors, e.g. utilities or tourism
    • G06Q50/06—Electricity, gas or water supply
    • 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
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Abstract

The invention discloses a line loss sharing method and device of a power transmission and distribution line, and belongs to the technical field of power systems. The line loss sharing method comprises the following steps of: acquiring actual line loss and theoretical line loss of a target node in a certain time period, wherein the target node is any one of a plurality of nodes; when the target node is connected with at least two branch lines, respectively determining the theoretical line loss of each branch line in the at least two branch lines within a certain time period according to the sequence of the at least two branch lines accessing the target node; and determining the actual line loss of each branch line connected with the target node according to the actual line loss and the theoretical line loss of the target node and the theoretical line loss of each branch line connected with the target node. The method eliminates errors caused by different access positions or access time of each branch line in the line loss sharing process, and improves the line loss sharing accuracy.

Description

Line loss sharing method and device for power transmission and distribution line
Technical Field
The invention relates to the technical field of power systems, in particular to a line loss sharing method and device for a power transmission and distribution line.
Background
With the advancement of electricity improvement, electricity selling companies become market main bodies for providing electricity selling services or electricity distributing services, the electricity selling companies obtain electric energy from electricity purchasing gateways of various electricity generating companies and distribute the electric energy to user terminals for sale and use, loss is inevitably generated in the process of electric energy distribution, the loss usually accounts for 5% -15% of the total electric energy, and how to distribute the loss to market participants of various electricity generating companies, electricity consuming companies and the like fairly, justly, accurately and reasonably is one of the key problems of the healthy development of the electricity market and is also important content of electricity transmission pricing in the electricity market.
At present, two methods for acquiring the bus loss on the power transmission and distribution line exist, one method is to calculate the bus loss of the power transmission and distribution line by adopting a tide method, a root mean square current method or a maximum load loss hour method, and the other method is to actually measure the bus loss on the power transmission and distribution line by a measuring person. When branch lines are connected to the power transmission and distribution line, the line loss of each branch line is generally divided according to the ratio of active electric quantities, the ratio of squares of the active electric quantities, a load current table look-up method and other methods.
In the process of implementing the invention, the inventor finds that the prior art has at least the following problems:
when the bus loss of the power transmission and distribution line is distributed to each branch line by adopting the method, the actually distributed line loss on each branch line is only related to the active electric quantity or the load current on the circuit, for example, when the active electric quantities on the two branch lines are the same, the distributed line loss on the two branch lines is also the same. In fact, for two branch lines accessed at different positions and at different times, even if the active electric quantity or the load current on the circuit is the same, the actual line loss on each branch line is also different, so that when the line loss sharing method is adopted to share the bus loss on the power transmission and distribution line to each branch line, the line loss sharing is not accurate enough.
Disclosure of Invention
The embodiment of the invention provides a line loss sharing method and device of a power transmission and distribution line, which can solve the problem that line loss sharing is not accurate enough in the prior art. The technical scheme is as follows:
in a first aspect, the present invention provides a line loss allocation method for a power transmission and distribution line, where the power transmission and distribution line is connected to a plurality of branch lines, the power transmission and distribution line is divided into a plurality of sections, each section of the power transmission and distribution line is a node, and each node is connected to at least one branch line, where the line loss allocation method includes:
acquiring actual line loss and theoretical line loss of a target node in a certain time period, wherein the target node is any one of a plurality of nodes;
when the target node is connected with at least two branch lines, respectively determining the theoretical line loss of each branch line in the at least two branch lines in the time period according to the sequence of the at least two branch lines accessing the target node;
and determining the actual line loss of each branch line connected with the target node according to the actual line loss and the theoretical line loss of the target node and the theoretical line loss of each branch line connected with the target node.
Further, when the access time intervals of any two of the at least two branch lines are greater than a time threshold, the determining the theoretical line loss of each of the at least two branch lines in the time period respectively includes:
respectively calculating the theoretical line loss of each branch line according to the following formula:
Figure BDA0001685948430000021
wherein, WqRepresenting the theoretical line loss of the q branch, R representing the resistance of the target node, t representing the length of the time period, IqRepresenting the load current of the qth leg,
Figure BDA0001685948430000022
representing the sum of the load currents of all branches which are accessed into the target node before the Q-th branch is accessed into the target node, wherein Q is more than or equal to 2 and less than or equal to Q, and Q represents the accessA total number of legs of the target node.
Further, when the access time interval of any two branches of the at least two branches does not exceed the time threshold, the determining the theoretical line loss of each branch of the at least two branches in the time period respectively includes:
respectively calculating the theoretical line loss of each branch line according to the following formula:
Figure BDA0001685948430000023
wherein, WqRepresenting the theoretical line loss of the q branch, R representing the resistance of the target node, t representing the length of the time period, IqRepresenting the load current of the qth leg,
Figure BDA0001685948430000024
and Q is more than or equal to 2 and less than or equal to Q, and Q represents the total number of the branches accessed to the target node.
Further, the determining the actual line loss of each branch line connected to the target node according to the actual line loss and the theoretical line loss of the target node and the theoretical line loss of each branch line connected to the target node includes:
respectively determining the ratio of the theoretical line loss of each branch line of the at least two branch lines in the time period to the theoretical line loss of the target node;
and determining the actual line loss of each branch line connected with the target node according to the ratio of the actual line loss of the target node to each branch line connected with the target node.
Furthermore, the at least two branch lines are divided into at least two branch line sets, each branch line set comprises one branch line or at least two branch lines with access time intervals smaller than a time threshold, and the minimum access time interval of the branch lines between different branch line sets is larger than the time threshold;
determining the actual line loss of each branch line connected with the target node according to the actual line loss and the theoretical line loss of the target node and the theoretical line loss of each branch line connected with the target node, including:
acquiring the total theoretical line loss of a first branch set in the time period, wherein the first branch set is any one of the at least two branch sets;
determining the total actual line loss of the first branch set according to the ratio of the total theoretical line loss of the first branch set to the theoretical line loss of the target node and the total actual line loss of the target node;
and determining the actual line loss of each branch line in the first branch line set according to the ratio of the theoretical line loss of each branch line in the first branch line set in the time period to the total theoretical line loss of the first branch line set and the total actual line loss of the first branch line set.
Further, the total theoretical line loss of the first set of legs is calculated according to the following formula:
Figure BDA0001685948430000031
wherein, W0mRepresenting the total theoretical line loss of the mth branch set, R representing the resistance of the target node, t representing the length of the time period, I0mRepresenting the total load current of all the legs in the mth set of legs,
Figure BDA0001685948430000032
and before the branch lines in the mth branch line set are connected with the target node, the sum of the load currents of all the branch lines connected with the target node is represented, M is more than or equal to 2 and less than or equal to M, M represents the total number of the branch line sets, and the mth branch line set represents the first branch line set.
Further, the determining the total actual line loss of the first set of legs comprises:
calculating a total actual line loss of the first set of legs according to the following formula:
Figure BDA0001685948430000033
Wm'＝W'*K0m；
wherein, W0mRepresents the total theoretical line loss, W, of the mth set of legs0Represents the theoretical line loss, K, of the target node0mRepresenting the ratio of the total theoretical line loss of the mth branch set to the theoretical line loss of the target node, Wm'represents the total actual line loss of the mth branch set, and W' represents the actual line loss of the target node.
Further, the theoretical line loss of each branch line in the first branch line set is calculated according to the following formula:
Figure BDA0001685948430000041
wherein, WnmRepresenting the theoretical line loss of the nth branch line in the mth branch line set, R representing the resistance of the target node, t representing the length of the time period, InmRepresenting the load current of the nth branch in the mth set of branches,
Figure BDA0001685948430000042
and M is more than or equal to 2 and less than or equal to M, M represents the total number of the branch line sets, the mth branch line set represents the first branch line set, N is more than or equal to 2 and less than or equal to N, and N represents the total number of all the branch lines in the mth branch line set.
Further, the determining an actual line loss of each branch line in the first set of branch lines comprises:
calculating an actual line loss for each leg in the first set of legs according to the following formula:
Figure BDA0001685948430000043
Wnm'＝Wm'*Knm；
wherein, WnmRepresents the theoretical line loss, W, of the nth branch line in the mth branch line set0mRepresents the total theoretical line loss, K, of the mth set of branchesnmRepresents the ratio of the theoretical line loss of the nth branch line in the mth branch line set to the total theoretical line loss of the mth branch line set, Wm' denotes the total actual line loss, W, of the m-th set of branch linesnm' denotes the actual line loss of the nth branch line in the mth set of branch lines.
In a second aspect, an embodiment of the present invention provides a line loss sharing apparatus for a power transmission and distribution line, where the power transmission and distribution line is connected to a plurality of branch lines, the power transmission and distribution line is divided into multiple sections, each section of the power transmission and distribution line is a node, and each node is connected to at least one branch line, where the line loss sharing apparatus includes:
a processor and a memory, the memory having stored therein at least one instruction that is loaded and executed by the processor to implement the line impairment sharing method of the first aspect.
The technical scheme provided by the embodiment of the invention has the following beneficial effects:
the line loss sharing method includes the steps that a power transmission and distribution line is divided into multiple sections, each section of power transmission and distribution line is a node, at least one branch line is connected to each node, then actual line loss needing to be shared by the branch lines connected to each node is determined, namely, the branch lines connected to the power transmission and distribution line are divided according to access positions, then actual line loss of the branch lines accessed at different positions is calculated respectively, and errors caused by the fact that the access positions of the branch lines are different in the line loss sharing process are eliminated. Meanwhile, when line loss sharing is carried out on branch lines connected to each node, if at least two branch lines are connected to the node, theoretical line loss of each of the at least two branch lines in a certain time period is respectively determined according to the sequence of the at least two branch lines accessing a target node, and then the actual line loss of each branch line connected to the target node is determined according to the actual line loss and the theoretical line loss of the target node and the theoretical line loss of each branch line connected to the target node.
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In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a flowchart of a method for line loss sharing of a power transmission and distribution line according to an embodiment of the present invention;
figure 2 is a schematic diagram of a partial structure of a power transmission and distribution line according to an embodiment of the present invention;
fig. 3 is a flowchart of another method for line loss sharing of a power transmission and distribution line according to an embodiment of the present invention;
fig. 4 is a flowchart of a method for line loss sharing of a power transmission and distribution line according to another embodiment of the present invention;
FIG. 5 is a flowchart of a specific method of step 303 provided by an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a line loss sharing apparatus for a power transmission and distribution line according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
In order to facilitate understanding of the embodiment of the present invention, the following briefly describes a structure of a power transmission and distribution line:
the power transmission and distribution line comprises a bus and a plurality of branch lines connected to the bus, and the plurality of branch lines are connected to the bus at different positions. In this embodiment, the bus is divided into multiple sections, each section of bus is a node, each node is connected with at least one branch line, and the branch lines connected to different nodes are different. The load current of each node follows kirchhoff's law, that is, the total load current of each node is equal to the load currents of all the branches connected to the node.
The access time of each branch access node is different, one node is arbitrarily selected as a target node, when at least two branches are connected to the target node, the at least two branches connected to the target node are divided into a plurality of branch sets according to the access time, the access time interval of the branches in the same branch set accessing the target node does not exceed a time threshold, wherein the time threshold can be a period of time set manually, for example, one day, one week and the like, and the same branch set is formed by the branches accessing the target node in the same week.
In this embodiment, the power transmission and distribution line is a three-phase three-wire symmetrical circuit. The power transmission and distribution circuit obtains electric energy from the power purchase gateway and then transmits and distributes the electric energy to the user side for sale and use.
The embodiment of the present invention provides a line loss allocation method for a power transmission and distribution line, and fig. 1 is a flowchart of a method of the line loss allocation method for the power transmission and distribution line provided by the embodiment of the present invention, and as shown in fig. 1, the line loss allocation method includes:
step 101, obtaining actual line loss and theoretical line loss of a target node in a certain time period.
Optionally, the actual line loss of the target node may be calculated or measured.
In a first implementation manner of this step 101, the actual line loss of the target node may be calculated by using a root mean square current method.
Specifically, the actual line loss of the target node may be calculated according to the following formula (1):
Figure BDA0001685948430000061
wherein W' represents the actual line loss of the target node, R represents the resistance of the target node, and t representsThe length of the time interval, H represents the number of integral points in the time interval t, IhAnd H is more than 0 and less than or equal to H, and the value of the load current of the target node at the H integral point time is shown.
It should be noted that, in this embodiment, the resistance R of the target node may be obtained by looking up a table according to the minimum distance from the target node to the input end of the power transmission and distribution line and the model of the power transmission and distribution line and calculating, and the resistance R of the target node may also be obtained by measuring the voltage difference between the input end and the output end of the power transmission and distribution line and the current of the target node, and then calculating according to the voltage difference between the input end and the output end of the power transmission and distribution line and the current of the target node.
In the second implementation manner of step 101, a power flow method or a maximum load loss hour method may also be used to calculate the actual line loss of the target node, which is the prior art and is not described herein again.
In a third implementation manner of this step 101, the actual line loss of the target node may be actually measured by a measurement person, and the specific measurement manner is as follows:
and measuring the electric energy E1 of the target node, and measuring the electric energy E2 of the target node after the interval time t, wherein the difference value of the electric energy E2 and the electric energy E1 is the actual line loss of the target node.
In the specific measurement, the electric energy at the target node can be measured by using an electric energy meter.
Further, the theoretical line loss of the target node can be calculated according to the following formula (2):
W0＝3Rt*I0 2； (2)
wherein, W0Representing the theoretical line loss of the target node, R representing the resistance of the target node, t representing the length of the time period, I0Representing the total load current of the target node.
Step 102, when the target node is connected with at least two branch lines and the access time intervals of any two branch lines in the at least two branch lines are larger than a time threshold, respectively calculating the theoretical line loss of each branch line.
Specifically, the theoretical line loss of each branch line is calculated according to the formula (3):
Figure BDA0001685948430000071
wherein, WqRepresenting the theoretical line loss of the q branch line, R representing the resistance of the target node, t representing the length of the time period, IqRepresenting the load current of the qth leg,
Figure BDA0001685948430000072
and Q is more than or equal to 2 and less than or equal to Q, and Q represents the total number of the branches accessing the target node.
The specific derivation process of equation (3) is as follows:
in second factorization:
a2＝a2；
(a+b)2＝a2+b2+2ab＝a2+b2+ab+ba＝a2+b2+2ba；
(a+b+c)2＝a2+b2+c2+2ba+2bc+2ac＝a2+b2+2ba+c2+2c(a+b)；
(a+b+c+d)2＝a2+b2+c2+d2+2ab+2bc+2cd+2da+2ac+2bd
＝a2+b2+2ba+c2+2c(a+b)+d2+2d(a+b+c)。
from the above, it can be seen that when the quadratic factor is increased by one factor, the increased part of the quadratic factor is related to the original factor and the increased factor.
Similarly, the theoretical line loss is calculated by the formula:
W＝3I2Rt； (4)
when the theoretical line loss of the target node is calculated, if Q branch lines are connected to the target node, the total load current I of the target node is (I)1+I2+…+IQ)，I1、I2、…IQRespectively representing the load current of Q branch lines, the I in the formula (4)2Unfolding yields the following equation:
Figure BDA0001685948430000073
Figure BDA0001685948430000081
wherein the content of the first and second substances,
Figure BDA0001685948430000082
representing the sum of the squares of the load currents of the Q branches,
Figure BDA0001685948430000083
represents the sum of the products of the load currents of all the branches which have been connected to the target node and the load current of the Q branch before the Q branch is connected to the target node.
From the above equation, when the target node is connected to 1 branch, I2＝I1 2。
That is, when the target node is connected with only one branch line, the theoretical line loss of the branch line is equal to the theoretical line loss of the target node.
When the target node is connected with 2 branches, I2As a result, I is increased2 2+2I2I1；
When the target node is connected with 3 branches, I2As a result, I is increased3 2+2I3(I1+I2)；
When the target node is connected with Q branch lines, I2As a result, I is increasedQ 2+2IQ(I1+I2+…+IQ-1)；
Therefore, according to the above rule, when the target node is connected with one branch line at each time, I2As a result, is increased
Figure BDA0001685948430000084
At this time I2Results of (1) and1、I2、…、Iqif the load current of the branch connected after the q-th branch is not related, i.e. if the load current of the branch connected after the q-th branch is not related, I means2The result of (2) is related to the sequence of branch access, therefore, when the sequence of branch access accessing to the target node is considered, the calculation of the line loss generated by each branch accessing to the target node should be calculated by formula (3).
Fig. 2 is a schematic diagram of a partial structure of a power transmission and distribution line according to an embodiment of the present invention, as shown in fig. 2, three branch lines are connected to a P-segment of the power transmission and distribution line, and the P-segment is used as a target node, that is, three branch lines including an archaea station, an archaea line and a tsukudani line are respectively connected to the target node, wherein a total load current I of the target node P is known084.7A, load current I of the other ancient station139.3A, load current I of service line2Load current I of tsukudani line (15.6A)3＝29.8A。
Assuming that the access time intervals of any two of the three branches connected to the target node P at this time are all greater than the time threshold, the theoretical line loss W of the target node P at this time is0＝3RtI0 2. The theoretical line loss of each branch line can be calculated according to the formula (3):
Figure BDA0001685948430000085
suppose that this time
Figure BDA0001685948430000086
Then:
when the target node P only accesses the load of the ancient station:
delta I corresponding to theoretical line loss of ancient and ancient village stations1 2＝I1 2＝39.32＝1544.49；
When the target node P is accessed with the load of the service line again:
ancient affair lineCorresponding to the theoretical line loss of2 2＝I2 2+2I2I1＝15.62+2×39.3×15.6＝1469.52；
When the target node P is accessed to the load of the tsukudani line:
delta I corresponding to theoretical line loss of tsukudani line3 2＝I3 2+2I3(I1+I2)＝29.82+2×29.8×(39.3+15.6)＝4160.08；
The total delta I corresponding to the total theoretical line loss of the three branches2Comprises the following steps:
△I2＝△I1 2+△I2 2+△I3 2＝＝1544.49+1469.52+4160.08＝7174.09。
and I0 2＝84.72＝7174.09＝△I2From this, the theoretical line loss of the target node P is equal to the sum of the theoretical line losses of the three branches connected to the target node P.
The step 102 realizes that the theoretical line loss of each branch line in the at least two branch lines is respectively determined in a certain time period according to the sequence of the at least two branch lines accessing the target node.
And 103, determining the actual line loss of each branch line connected with the target node according to the actual line loss and the theoretical line loss of the target node and the theoretical line loss of each branch line connected with the target node.
Specifically, step 103 includes:
respectively determining the ratio of the theoretical line loss of each branch line of the at least two branch lines in a time period to the theoretical line loss of the target node;
and determining the actual line loss of each branch line connected with the target node according to the ratio of the actual line loss of the target node to each branch line connected with the target node.
The embodiment of the invention divides the power transmission and distribution line into a plurality of sections, each section of the power transmission and distribution line is a node, each node is connected with at least one branch line, then the actual line loss to be allocated of the branch line connected with each node is determined, which is equivalent to dividing each branch line connected with the power transmission and distribution line according to the access position, and then the actual line loss of the branch lines accessed at different positions is respectively calculated. Meanwhile, when line loss sharing is carried out on branch lines connected to each node, if at least two branch lines are connected to the node, theoretical line loss of each of the at least two branch lines in a certain time period is respectively determined according to the sequence of the at least two branch lines accessing a target node, and then the actual line loss of each branch line connected to the target node is determined according to the actual line loss and the theoretical line loss of the target node and the theoretical line loss of each branch line connected to the target node.
An embodiment of the present invention provides another line loss sharing method for a power transmission and distribution line, and fig. 3 is a flowchart of a method of the line loss sharing method for the power transmission and distribution line, provided by the embodiment of the present invention, and as shown in fig. 3, the line loss sharing method includes:
step 201, obtaining the actual line loss and the theoretical line loss of the target node in a certain time period.
This step is the same as step 101 and will not be described herein.
Step 202, when the target node is connected with at least two branches and the access time interval of any two branches of the at least two branches does not exceed the time threshold, respectively calculating the theoretical line loss of each branch.
Specifically, the theoretical line loss of each branch line is calculated according to equation (5):
Figure BDA0001685948430000101
wherein, WqRepresenting theoretical line loss of the q-th branch, R representing target nodeResistance, t represents the length of said time period, IqRepresenting the load current of the qth leg,
Figure BDA0001685948430000102
and Q is more than or equal to 2 and less than or equal to Q, and Q represents the total number of branches accessed to the target node.
The specific derivation process of equation (5) is as follows:
in second factorization:
a2＝a2；
(a+b)2＝a2+b2+2ab＝a2+b2+ab+ba＝a2+b2+ab+ba；
(a+b+c)2＝a2+b2+c2+2ba+2bc+2ac＝a2+b2+c2+a(b+c)+b(c+a)+c(a+b)；
(a+b+c+d)2＝a2+b2+c2+d2+2ab+2bc+2cd+2da+2ac+2bd
＝a2+b2+c2+d2+a(b+c+d)+b(c+d+a)+c(a+b+d)+d(a+b+c)。
from the above, it can be seen that when the quadratic factor is increased by one factor, the increased part of the quadratic factor is related to the original factor and the increased factor.
Similarly, the theoretical line loss is calculated by the formula:
W＝3I2Rt； (4)
when the theoretical line loss of the target node is calculated, if Q branch lines are connected to the target node, the total load current I of the target node is (I)1+I2+…+IQ)，I1、I2、…IQRespectively representing the load current of Q branch lines, the load current is represented by I in the formula2Unfolding yields the following equation:
Figure BDA0001685948430000103
wherein the content of the first and second substances,
Figure BDA0001685948430000104
representing the sum of the squares of the currents of the Q branches,
Figure BDA0001685948430000105
represents the sum of the products of the current sum of the branches other than the Q-th branch and the current of the Q-th branch.
From the above equation, when the target node is connected to 1 branch, I2＝I1 2；
That is, when the target node is connected with only one branch line, the theoretical line loss of the branch line is equal to the theoretical line loss of the target node.
When the target node is connected with 2 branches, I2＝I1 2+I2 2+I1I2+I2I1；
When the target node is connected with 3 branches, I2＝I1 2+I2 2+I3 2+I1(I2+I3)+I2(I1+I3)+I3(I1+I2)；
Therefore, according to the above rule, I2Results of (1) and1、I2、…、IQi, I is related to the load current of all branches connected to the target node2The result of (2) is irrelevant to the sequence of branch access, so that when the sequence of branch access of the access target node is not considered, the formula (5) is adopted for calculating the line loss generated by each branch of the access target node.
Referring to fig. 2 again, assuming that the access time interval of any two branches of the three branches on the target node P does not exceed the time threshold at this time, the theoretical line loss W of the target node at this time is0＝3RtI0 2. The theoretical line loss of each branch line can be calculated according to the formula (5):
Figure BDA0001685948430000111
suppose that this time
Figure BDA0001685948430000112
Then:
when the target node P is only accessed to the other ancient station, the theoretical line loss of the other ancient station corresponds to the Delta I1 2Comprises the following steps:
△I1 2＝I1 2+I1(I2+I3)＝39.32+39.3×(15.6+29.8)＝3328.71；
when the target node P is accessed into other ancient stations and the ancient line, the theoretical line loss of the ancient line corresponds to delta I2 2Comprises the following steps:
△I2 2＝I2 2+I2(I1+I3)＝15.62+15.6×(39.3+29.8)＝1321.32；
when the target node P is accessed to the ancient station, the ancient line and the tsukudani line, the delta I corresponding to the theoretical line loss of the tsukudani line3 2Comprises the following steps:
△I3 2＝I3 2+I3(I1+I2)＝29.82+29.8×(39.3+15.6)＝2524.06；
then the total Δ I corresponding to the total theoretical line loss of the three branches is:
△I2＝△I1 2+△I2 2+△I3 2＝3328.71+1321.32+2524.06＝7174.09。
and I0 2＝84.72＝7174.09＝△I2From this, the theoretical line loss of the target node P is equal to the sum of the theoretical line losses of the three branches connected to the target node P.
The step 202 realizes that the theoretical line loss of each branch line in the at least two branch lines is respectively determined in a certain time period according to the sequence of the at least two branch lines accessing the target node.
And step 203, determining the actual line loss of each branch line connected with the target node according to the actual line loss and the theoretical line loss of the target node and the theoretical line loss of each branch line connected with the target node.
This step is the same as step 103 and will not be described herein.
The embodiment of the invention divides the power transmission and distribution line into a plurality of sections, each section of the power transmission and distribution line is a node, each node is connected with at least one branch line, then the actual line loss to be allocated of the branch line connected with each node is determined, which is equivalent to dividing each branch line connected with the power transmission and distribution line according to the access position, and then the actual line loss of the branch lines accessed at different positions is respectively calculated. Meanwhile, when line loss sharing is carried out on branch lines connected to each node, if at least two branch lines are connected to the node, theoretical line loss of each of the at least two branch lines in a certain time period is respectively determined according to the sequence of the at least two branch lines accessing a target node, and then the actual line loss of each branch line connected to the target node is determined according to the actual line loss and the theoretical line loss of the target node and the theoretical line loss of each branch line connected to the target node.
The embodiment of the present invention provides another line loss sharing method for a power transmission and distribution line, fig. 4 is a flowchart of a method of the line loss sharing method for the power transmission and distribution line provided by the embodiment of the present invention, and as shown in fig. 4, the line loss sharing method includes:
step 301, obtaining the actual line loss and the theoretical line loss of the target node in a certain time period.
This step is the same as step 101 and step 201, and is not described herein again.
Step 302, when the target node is connected with at least two branches, respectively determining the theoretical line loss of each branch in the at least two branches within a certain time period according to the sequence of the at least two branches accessing the target node.
In this embodiment, the at least two branches are divided into at least two branch sets, each branch set includes one branch or at least two branches whose access time interval does not exceed a time threshold, and the minimum access time interval of a branch between different branch sets is greater than the time threshold.
Specifically, step 302 includes:
calculating the theoretical line loss of each branch line in the first branch line set according to the following formula (6):
Figure BDA0001685948430000121
wherein, WnmRepresenting the theoretical line loss of the nth branch line in the mth branch line set, R representing the resistance of the target node, t representing the length of the time period, InmRepresenting the load current of the nth branch in the mth set of branches,
Figure BDA0001685948430000122
the load current sum of all branch lines in the mth branch line set is represented, M is larger than or equal to 2 and smaller than or equal to M, M represents the total number of the branch line sets, the mth branch line set represents the first branch line set, N is larger than or equal to 2 and smaller than or equal to N, and N represents the total number of all branch lines in the mth branch line set.
It should be noted that, in this embodiment, when there is only one branch line in the first set of branch lines, the theoretical line loss of the branch line is equal to the total theoretical line loss of the first set of branch lines.
Specifically, the total theoretical line loss of the first set of legs is calculated according to equation (7):
Figure BDA0001685948430000131
wherein, W0mIs shown asThe total theoretical line loss of the m branch line sets, R represents the resistance of a target node, t represents the length of a time period, I0mRepresenting the total load current of all the legs in the mth set of legs,
Figure BDA0001685948430000132
before the branch in the mth branch set is accessed to the target node, the sum of the load currents of all the branches accessed to the target node is represented, M is more than or equal to 2 and less than or equal to M, M represents the total number of the branch sets, and the mth branch set represents the first branch set.
Referring to fig. 2 again, it is assumed that, in three branches connected to the target node P at this time, the time interval between the archaized leg and the archaized line accessing the target node P does not exceed the time threshold, the time interval between the archaized leg and the archaized leg accessing the target node P exceeds the time threshold, and the time interval between the archaized leg and the archaized line accessing the target node P also exceeds the time threshold. The archaeological stations and the archaeological lines form a 1 st branch line set, the archaeological lines form a 2 nd branch line set, the theoretical line loss of each branch line in the 1 st branch line set can be calculated according to a formula (6), and the theoretical line loss of the archaeological lines in the 2 nd branch line set can be calculated according to a formula (7).
When the target node P accesses the ancient station and the ancient line:
delta I corresponding to total theoretical line loss of 1 st branch set01 2＝(I1+I2)2＝(39.3+15.6)2＝3014.01；
Wherein the theoretical line loss of the ancient village station corresponds to Delta I11 2＝I1 2+I1I2＝39.32+39.3×15.6＝2157.57；
Delta I corresponding to theoretical line loss of ancient service line21 2＝I2 2+I2I1＝15.62+15.6×39.3＝856.44；
When the target node P is accessed to the tsukudani line again:
delta I corresponding to theoretical line loss of No. 2 branch line set (i.e. tsukudani line)02 2＝I3 2+2I3(I1+I2)＝29.82+2×29.8×(39.3+15.6)＝4160.08；
The total theoretical line loss Δ I of the three legs is:
△I＝△I01 2+△I02 2＝3014.01+4160.08＝7174.09。
and I0 2＝84.72As can be seen from the theoretical line loss of the target node P equal to the sum of the theoretical line losses of the three branches connected to the target node P, 7174.09 is Δ I.
Step 303, determining the actual line loss of each branch line connected with the target node according to the actual line loss and the theoretical line loss of the target node and the theoretical line loss of each branch line connected with the target node.
Fig. 5 is a flowchart of a specific method of step 303 according to an embodiment of the present invention, and as shown in fig. 5, step 303 includes:
step 3031, acquiring the total theoretical line loss of the first branch set in a certain time period.
In step 3031, the calculation method of the total theoretical line loss of the first branch set in step 302 is the same, and the total theoretical line loss of the first branch set is calculated by using formula (7), which is not described herein again.
And 3032, determining the total actual line loss of the first branch set according to the ratio of the total theoretical line loss of the first branch set to the theoretical line loss of the target node and the total actual line loss of the target node.
Specifically, the total actual line loss of the first set of legs is calculated according to the following formula:
Figure BDA0001685948430000141
Wm'＝W'*K0m； (9)
wherein, W0mRepresents the total theoretical line loss, W, of the mth set of legs0Represents the theoretical line loss, K, of the target node0mRepresenting the total theoretical line loss of the mth set of branches and the theoretical line loss of the target nodeRatio, Wm'denotes the total actual line loss of the mth branch set, and W' denotes the actual line loss of the target node.
Step 3033, determining the actual line loss of each branch line in the first branch line set according to the ratio of the theoretical line loss of each branch line in the first branch line set to the total theoretical line loss of the first branch line set in a certain time period and the total actual line loss of the first branch line set.
Specifically, the actual line loss of each branch in the first set of branches is calculated according to the following formula:
Figure BDA0001685948430000142
Wnm'＝Wm'*Knm； (11)
wherein, WnmRepresents the theoretical line loss, W, of the nth branch line in the mth branch line set0mRepresents the total theoretical line loss, K, of the mth set of branchesnmRepresents the ratio of the theoretical line loss of the nth branch line in the mth branch line set to the total theoretical line loss of the mth branch line set, Wm' denotes the total actual line loss, W, of the m-th set of branch linesnm' denotes the actual line loss of the nth branch line in the mth set of branch lines.
The embodiment of the invention divides the power transmission and distribution line into a plurality of sections, each section of the power transmission and distribution line is a node, each node is connected with at least one branch line, then the actual line loss to be allocated of the branch line connected with each node is determined, which is equivalent to dividing each branch line connected with the power transmission and distribution line according to the access position, and then the actual line loss of the branch lines accessed at different positions is respectively calculated. Meanwhile, when line loss sharing is carried out on branch lines connected to each node, if at least two branch lines are connected to the node, theoretical line loss of each of the at least two branch lines in a certain time period is respectively determined according to the sequence of the at least two branch lines accessing a target node, and then the actual line loss of each branch line connected to the target node is determined according to the actual line loss and the theoretical line loss of the target node and the theoretical line loss of each branch line connected to the target node.
The embodiment of the invention provides a line loss sharing device of a power transmission and distribution line, which is used for sharing line loss on the power transmission and distribution line, wherein the power transmission and distribution line is connected with a plurality of branch lines, the power transmission and distribution line is divided into a plurality of sections, each section of the power transmission and distribution line is a node, and each node is connected with at least one branch line.
The obtaining module 100 is configured to obtain an actual line loss and a theoretical line loss of a target node within a certain time period, where the target node is any one of a plurality of nodes.
The first determining module 200 is configured to, when the target node is connected with at least two branches, respectively determine the theoretical line loss of each of the at least two branches in the time period according to a sequence in which the at least two branches access the target node.
Further, the first determining module 200 is further configured to calculate the theoretical line loss of each branch line when the access time interval of any two branch lines of the at least two branch lines is greater than the time threshold.
Specifically, the theoretical line loss of each branch line is calculated according to the formula (3):
Figure BDA0001685948430000151
wherein, WqRepresents the theoretical line loss of the q branch line, R represents the resistance of the target node, and t represents the length of the time period，IqRepresenting the load current of the qth leg,
Figure BDA0001685948430000152
and the sum of the load currents of all the branches which are accessed to the target node before the Q-th branch is accessed to the target node is represented, Q is more than 0 and less than or equal to Q, and Q represents the total number of the branches which are accessed to the target node.
Further, the first determining module 200 is further configured to calculate the theoretical line loss of each branch line when the access time interval of any two branch lines of the at least two branch lines does not exceed the time threshold.
Specifically, the theoretical line loss of each branch line is calculated according to equation (5):
Figure BDA0001685948430000153
wherein, WqRepresenting the theoretical line loss of the q branch line, R representing the resistance of the target node, t representing the length of the time period, IqRepresenting the load current of the qth leg,
Figure BDA0001685948430000154
and Q is more than 0 and less than or equal to Q, and Q represents the total number of branches accessed to the target node.
The second determining module 300 is configured to determine an actual line loss of each branch line connected to the target node according to the actual line loss and the theoretical line loss of the target node and the theoretical line loss of each branch line connected to the target node.
Further, the second determining module 300 is further configured to determine a ratio of a theoretical line loss of each of the at least two branches in the time period to a theoretical line loss of the target node; and determining the actual line loss of each branch line connected with the target node according to the ratio of the actual line loss of the target node to each branch line connected with the target node.
Further, when the at least two branches are divided into at least two branch sets, each branch set includes one branch or at least two branches with an access time interval not exceeding a time threshold, and a minimum access time interval of the branches between different branch sets is greater than the time threshold, the second determining module 300 further includes a first obtaining module 310, a first sub-determining module 320, and a second sub-determining module 330.
The first obtaining module 310 is configured to obtain a total theoretical line loss of a first branch set in a time period, where the first branch set is any one of at least two branch sets.
Specifically, the first obtaining module 310 is further configured to calculate an overall theoretical line loss of the first branch set:
specifically, the total theoretical line loss of the first set of legs is calculated according to equation (7):
Figure BDA0001685948430000161
wherein, W0mRepresenting the total theoretical line loss of the mth branch set, R representing the resistance of the target node, t representing the length of the time period, I0mRepresenting the total load current of all the legs in the mth set of legs,
Figure BDA0001685948430000162
before the branch in the mth branch set is accessed to the target node, the sum of the load currents of all the branches accessed to the target node is represented, M is more than or equal to 2 and less than or equal to M, M represents the total number of the branch sets, and the mth branch set represents the first branch set.
The first sub-determining module 320 is configured to determine a total actual line loss of the first branch set according to a ratio of the total theoretical line loss of the first branch set to the theoretical line loss of the target node and a total actual line loss of the target node.
Specifically, the total actual line loss of the first set of legs is calculated according to the following formula:
Figure BDA0001685948430000163
Wm'＝W'*K0m；(9)
wherein, W0mRepresents the total theoretical line loss, W, of the mth set of legs0Represents the theoretical line loss, K, of the target node0mRepresents the ratio of the total theoretical line loss of the mth branch set to the theoretical line loss of the target node, Wm'denotes the total actual line loss of the mth branch set, and W' denotes the actual line loss of the target node.
The second sub-determining module 330 determines the actual line loss of each branch line in the first branch line set according to the ratio of the theoretical line loss of each branch line in the first branch line set in the time period to the total theoretical line loss of the first branch line set, and the total actual line loss of the first branch line set.
The second sub-determination module 330 is further configured to calculate a theoretical line loss of each branch in the first set of branches in the time period.
Specifically, the theoretical line loss of each branch in the first set of branches is calculated according to the following formula (6):
Figure BDA0001685948430000171
wherein, WnmRepresenting the theoretical line loss of the nth branch line in the mth branch line set, R representing the resistance of the target node, t representing the length of the time period, InmRepresenting the load current of the nth branch in the mth set of branches,
Figure BDA0001685948430000172
the load current sum of all branch lines in the mth branch line set is represented, M is larger than or equal to 2 and smaller than or equal to M, M represents the total number of the branch line sets, the mth branch line set represents the first branch line set, N is larger than or equal to 2 and smaller than or equal to N, and N represents the total number of all branch lines in the mth branch line set.
It should be noted that, in this embodiment, when there is only one branch line in the first set of branch lines, the theoretical line loss of the branch line is equal to the total theoretical line loss of the first set of branch lines.
The second sub-determination module 330 is further configured to calculate an actual line loss of each branch in the first set of branches.
Specifically, the actual line loss of each branch in the first set of branches is calculated according to the following formula:
Figure BDA0001685948430000173
Wnm'＝Wm'*Knm； (11)
wherein, WnmRepresents the theoretical line loss, W, of the nth branch line in the mth branch line set0mRepresents the total theoretical line loss, K, of the mth set of branchesnmRepresents the ratio of the theoretical line loss of the nth branch line in the mth branch line set to the total theoretical line loss of the mth branch line set, Wm' denotes the total actual line loss, W, of the m-th set of branch linesnm' denotes the actual line loss of the nth branch line in the mth set of branch lines.
The embodiment of the invention divides the power transmission and distribution line into a plurality of sections, each section of the power transmission and distribution line is a node, each node is connected with at least one branch line, then the actual line loss to be allocated of the branch line connected with each node is determined, which is equivalent to dividing each branch line connected with the power transmission and distribution line according to the access position, and then the actual line loss of the branch lines accessed at different positions is respectively calculated. Meanwhile, when line loss sharing is carried out on branch lines connected to each node, if at least two branch lines are connected to the node, theoretical line loss of each of the at least two branch lines in a certain time period is respectively determined according to the sequence of the at least two branch lines accessing a target node, and then the actual line loss of each branch line connected to the target node is determined according to the actual line loss and the theoretical line loss of the target node and the theoretical line loss of each branch line connected to the target node.
Embodiments of the present invention provide a computer-readable storage medium having at least one instruction, at least one program, set of codes, or set of instructions stored therein, where the at least one instruction, the at least one program, set of codes, or set of instructions is loaded and executed by a processor to implement a line impairment sharing method as described above.
One embodiment of the present application provides a terminal, which includes a processor and a memory, where the memory stores at least one instruction, and the instruction is loaded and executed by the processor to implement the line loss sharing method as described above.
It should be noted that: in the line loss sharing apparatus provided in the foregoing embodiment, when performing line loss sharing, only the division of each functional module is illustrated, and in practical applications, the function distribution may be completed by different functional modules according to needs, that is, the internal structure of the line loss sharing apparatus is divided into different functional modules to complete all or part of the functions described above. In addition, the line loss sharing device and the line loss sharing method provided by the above embodiments belong to the same concept, and specific implementation processes thereof are detailed in the method embodiments and are not described herein again.
It will be understood by those skilled in the art that all or part of the steps for implementing the above embodiments may be implemented by hardware, or may be implemented by a program instructing relevant hardware, where the program may be stored in a computer-readable storage medium, and the above-mentioned storage medium may be a read-only memory, a magnetic disk or an optical disk, etc.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims (8)

1. The line loss sharing method of the power transmission and distribution line is characterized in that the power transmission and distribution line is divided into a plurality of sections, each section of the power transmission and distribution line is a node, and each node is connected with at least one branch line, and comprises the following steps:
acquiring actual line loss and theoretical line loss of a target node in a time period, wherein the target node is any one of a plurality of nodes;
when the target node is connected with at least two branch lines, respectively determining the theoretical line loss of each branch line in the at least two branch lines in the time period according to the sequence of the at least two branch lines accessing the target node;
determining the actual line loss of each branch line connected with the target node according to the actual line loss and the theoretical line loss of the target node and the theoretical line loss of each branch line connected with the target node;
when the at least two branch lines are divided into at least two branch line sets, each branch line set comprises one branch line or at least two branch lines with access time intervals not exceeding a time threshold, and the minimum access time interval of the branch lines between different branch line sets is greater than the time threshold, determining the actual line loss of each branch line connected with the target node according to the actual line loss and the theoretical line loss of the target node and the theoretical line loss of each branch line connected with the target node, comprising:
calculating an overall theoretical line loss of a first set of legs in the time period, the first set of legs being any one of the at least two sets of legs, according to the following formula:
Figure FDA0003101236990000011
wherein, W0mRepresenting the total theoretical line loss of the mth branch set, R representing the resistance of the target node, t representing the length of the time period, I0mRepresenting the total load current of all the legs in the mth set of legs,
Figure FDA0003101236990000012
representing the sum of the load currents of all branch lines which are accessed to the target node before the branch lines in the mth branch line set are accessed to the target node, wherein M is more than or equal to 2 and less than or equal to M, M represents the total number of the branch line sets, and the mth branch line set represents the first branch line set;
determining the total actual line loss of the first branch set according to the ratio of the total theoretical line loss of the first branch set to the theoretical line loss of the target node and the total actual line loss of the target node;
and determining the actual line loss of each branch line in the first branch line set according to the ratio of the theoretical line loss of each branch line in the first branch line set in the time period to the total theoretical line loss of the first branch line set and the total actual line loss of the first branch line set.
2. The line loss sharing method of claim 1, wherein the separately determining the theoretical line loss of each of the at least two legs for the time period when the access time intervals of any two legs of the at least two legs are greater than a time threshold comprises:
respectively calculating the theoretical line loss of each branch line according to the following formula:
Figure FDA0003101236990000021
wherein, WqRepresenting the theoretical line loss of the q branch, R representing the resistance of the target node, t representing the length of the time period, IqRepresenting the load current of the qth leg,
Figure FDA0003101236990000022
and representing the sum of the load currents of all the branches which are accessed to the target node before the Q-th branch is accessed to the target node, wherein Q is more than or equal to 2 and less than or equal to Q, and Q represents the total number of the branches accessed to the target node.
3. The line loss sharing method of claim 1, wherein when the access time interval of any two of the at least two legs does not exceed the time threshold, the separately determining the theoretical line loss for each of the at least two legs over the time period comprises:
respectively calculating the theoretical line loss of each branch line according to the following formula:
Figure FDA0003101236990000023
wherein, WqRepresenting the theoretical line loss of the q branch, R representing the resistance of the target node, t representing the length of the time period, IqRepresenting the load current of the qth leg,
Figure FDA0003101236990000024
and Q is more than or equal to 2 and less than or equal to Q, and Q represents the total number of the branches accessed to the target node.
4. The line loss sharing method according to claim 1, wherein when the access time intervals of any two of the at least two branches are both greater than a time threshold or when the access time intervals of any two of the at least two branches do not exceed the time threshold, the determining the actual line loss of each branch to which the target node is connected according to the actual line loss and the theoretical line loss of the target node and the theoretical line loss of each branch to which the target node is connected comprises:
respectively determining the ratio of the theoretical line loss of each branch line of the at least two branch lines in the time period to the theoretical line loss of the target node;
and determining the actual line loss of each branch line connected with the target node according to the ratio of the actual line loss of the target node to each branch line connected with the target node.
5. The line loss sharing method of claim 1, wherein the determining the total actual line loss of the first set of legs comprises:
calculating a total actual line loss of the first set of legs according to the following formula:
Figure FDA0003101236990000025
Wm'＝W'*K0m；
wherein, W0mRepresents the total theoretical line loss, W, of the mth set of legs0Represents the theoretical line loss, K, of the target node0mRepresenting the ratio of the total theoretical line loss of the mth branch set to the theoretical line loss of the target node, Wm'represents the total actual line loss of the mth branch set, and W' represents the actual line loss of the target node.
6. The line loss sharing method of claim 1, wherein the theoretical line loss of each branch line in the first set of branch lines is calculated according to the following formula:
Figure FDA0003101236990000031
wherein, WnmRepresenting the theoretical line loss of the nth branch line in the mth branch line set, R representing the resistance of the target node, t representing the length of the time period, InmRepresenting the load current of the nth branch in the mth set of branches,
Figure FDA0003101236990000032
and M is more than or equal to 2 and less than or equal to M, M represents the total number of the branch line sets, the mth branch line set represents the first branch line set, N is more than or equal to 2 and less than or equal to N, and N represents the total number of all the branch lines in the mth branch line set.
7. The line loss sharing method of claim 1, wherein the determining the actual line loss of each leg in the first set of legs comprises:
calculating an actual line loss for each leg in the first set of legs according to the following formula:
Figure FDA0003101236990000033
Wnm'＝Wm'*Knm；
wherein, WnmRepresents the theoretical line loss, W, of the nth branch line in the mth branch line set0mRepresents the total theoretical line loss, K, of the mth set of branchesnmRepresents the ratio of the theoretical line loss of the nth branch line in the mth branch line set to the total theoretical line loss of the mth branch line set, Wm' denotes the total actual line loss, W, of the m-th set of branch linesnm' denotes the actual line loss of the nth branch line in the mth set of branch lines.
8. The utility model provides a device is shared to line loss of transmission and distribution lines, be connected with many branch lines on the transmission and distribution lines, its characterized in that, transmission and distribution lines divide into the multistage, every section transmission and distribution lines is a node, every be connected with at least one on the node branch line, the device is shared to line loss includes:
a processor and a memory, the memory having stored therein at least one instruction that is loaded and executed by the processor to implement the line loss sharing method of any one of claims 1-7.
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