CN115207926A - Method and related device for measuring and calculating transferable power supply capacity of medium-voltage line of power distribution network - Google Patents

Method and related device for measuring and calculating transferable power supply capacity of medium-voltage line of power distribution network Download PDF

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Publication number
CN115207926A
CN115207926A CN202211125266.XA CN202211125266A CN115207926A CN 115207926 A CN115207926 A CN 115207926A CN 202211125266 A CN202211125266 A CN 202211125266A CN 115207926 A CN115207926 A CN 115207926A
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line
switch
medium
power supply
transferred
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CN115207926B (en
Inventor
王小虎
林章霖
麦伟斌
罗宗杰
戴乔旭
符方炫
陈云龙
张华煜
李凯
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Zhanjiang Power Supply Bureau of Guangdong Power Grid Co Ltd
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Zhanjiang Power Supply Bureau of Guangdong Power Grid Co Ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
    • H02J2203/10—Power transmission or distribution systems management focussing at grid-level, e.g. load flow analysis, node profile computation, meshed network optimisation, active network management or spinning reserve management
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
    • H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]

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  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)

Abstract

The application discloses a method and a related device for measuring and calculating the transferable power supply capacity of a medium-voltage line of a power distribution network, wherein an electrical connection topological relation graph in a mode of 'transformer substation-main transformer-10 kV line A-line A section switch-line interconnection switch-line B section switch-10 kV line B-main transformer-transformer substation' is established based on a current power distribution network information system relation graph to form a hash table of related line attributes, a fully-covered power distribution automation system is utilized to collect data such as line current, line section switch current and the like, and algorithm program measurement and calculation are respectively carried out on a single radiation line, a single interconnection line and two interconnection lines under a typical power distribution network line structure through the number of interconnection points and the expected switching range of power supply switches. By means of switch testing, subsection power transfer calculation, partial power transfer calculation, current limiting condition of a power transfer path and line load condition, the situation that power transfer margin is inconsistent with actual power transfer power is effectively avoided.

Description

Method and related device for measuring and calculating transferable power supply capacity of medium-voltage line of power distribution network
Technical Field
The application relates to the technical field of electric power, in particular to a method and a related device for measuring and calculating the rotatable power supply capacity of a medium-voltage line of a power distribution network.
Background
In the planning and operation process of a power distribution network, reliable power supply of a medium-voltage line is an important requirement, and the power conversion and supply capacity of the line is a primary index for reflecting the power supply reliability of the line. In order to improve the power supply conversion capacity of the power distribution network line, the medium-voltage line network frame of the power distribution network is continuously perfect, and effective connection is formed by constructing a reasonable feeder group, so that the line can convert and supply partial users of a power-off line or an overhaul line during fault power failure or line overhaul, and reliable power supply is ensured.
The method mainly comprises the steps of inquiring peak current values and time of the power distribution network line to be converted, associating the power distribution network line to an interconnection line according to a topological network, calculating power supply margin of the interconnection line, judging whether the margin meets the peak load current condition of the power supply line to be converted or not, and calculating the rotatable power supply capacity.
The method for calculating the rotatable power supply capacity by the existing program or table formula does not consider the specific current limiting and real-time current conditions of the power supply path lead of the circuit, so that the condition of limited rotatable power supply current due to small or large power supply path lead of the power supply circuit to be rotated or the power supply path lead of the communication circuit possibly occurs under the condition of sufficient margin of the communication circuit; and in the process that the two circuits of interconnection lines jointly transfer power to one circuit, because the positions of the interconnection positions and the section switches are unreasonable, the load of the transferable power supply is smaller than the value calculated by the theoretical margin. In summary, in the conventional procedure or table calculation process, the situations of current limitation and real-time current of the line of the switched power supply path are ignored, and the situations of different positions of the section switches are involved, so that the calculated rotatable power supply capability of the line does not conform to the actual situation.
Disclosure of Invention
The application provides a method and a related device for measuring and calculating the rotatable power supply capacity of a medium-voltage line of a power distribution network, which are used for solving the technical problem that the rotatable power supply capacity of the line calculated in the prior art does not accord with the actual situation.
In view of this, the first aspect of the present application provides a method for measuring and calculating a transferable power supply capability of a medium-voltage line in a power distribution network, where the method includes:
s1, establishing an attribute information hash table of a line to be transferred and a corresponding contact line in each medium-voltage line;
s2, according to the name and the number of the medium-voltage line to be detected, obtaining the peak load time of the area and writing the peak load time into an attribute information hash table of the medium-voltage line to be detected, and then determining a connection wiring mode of the medium-voltage line to be detected by reading the number of connection switches of the attribute information hash table of the medium-voltage line to be detected;
s3, when the contact wiring mode of the medium-voltage line to be tested is a single contact line, calculating based on the information of the attribute information hash
Figure 381614DEST_PATH_IMAGE001
If Δ is greater than zero, step S4 is performed, otherwise step S8 is performed, wherein,
Figure 408345DEST_PATH_IMAGE002
the line current limiting value of the connecting line B in the medium-voltage line to be measured,
Figure 826688DEST_PATH_IMAGE003
For interconnecting lines BThe load current at the corresponding time,
Figure 73124DEST_PATH_IMAGE004
The current of the line A to be transferred;
s4, acquiring a transfer path automatic switch sequence KAi from the line A to be transferred to the interconnection line B based on an attribute information hash table of the medium-voltage line to be measured, and setting the ith switch current of the line A to be transferred as I kAi The current limiting value of the two side wires is I kAMi ；
S5, for the line A to be transferred, testing is carried out from the switch of the 1 st adjacent contact point of the line A to be transferred until the switch of the head end of the line A to be transferred, and calculation is carried out
Figure 602325DEST_PATH_IMAGE005
When is coming into contact with
Figure 296612DEST_PATH_IMAGE006
When the power supply capacity is less than 0, the rotatable power supply capacity is as follows:
Figure 400703DEST_PATH_IMAGE007
；
s6, for the interconnection line B, testing is carried out from the 1 st automatic switch close to the interconnection point of the interconnection line B until the head end switch of the interconnection line B, and calculation is carried out
Figure 118123DEST_PATH_IMAGE008
When is coming into contact with
Figure 201748DEST_PATH_IMAGE006
When the current is less than 0, the rotatable power supply capacity is as follows:
Figure 953803DEST_PATH_IMAGE009
；
s7, when all the switches pass the test, namely
Figure 963217DEST_PATH_IMAGE006
If the current values are all larger than 0, the transferable power supply capacity of the line transfer circuit A to be transferred is 100 percent, and if the switch test at a certain position does not pass, namely the switch test at the certain position does not pass
Figure 167933DEST_PATH_IMAGE006
Less than 0, the transferable power supply capability of the line transfer circuit A to be transferred is
Figure 366833DEST_PATH_IMAGE010
；
S8, communicating the switch
Figure 735846DEST_PATH_IMAGE011
The direction of the initial section A of the line to be transferred is subjected to the test of the transfer switch, and the test switch range is set as
Figure 666893DEST_PATH_IMAGE012
To communicate the switch
Figure 608173DEST_PATH_IMAGE011
Trend towards
Figure 345185DEST_PATH_IMAGE013
The ith automatic switch has a current of I kAi When is coming into contact with
Figure 806253DEST_PATH_IMAGE014
And is
Figure 924513DEST_PATH_IMAGE015
If the power conversion capability of the connection line B to the line a is:
Figure 103822DEST_PATH_IMAGE016
in which
Figure 565896DEST_PATH_IMAGE017
The minimum value of the current limit is connected to the path switch for the connection line B.
Optionally, step S2 is followed by:
s01, when the contact wiring mode of the medium-voltage line to be tested is two contact lines, calculating the transfer supply margins of the lines B and C to be respectively the transfer supply margins based on the hash information of the attribute information
Figure 147050DEST_PATH_IMAGE018
And
Figure 482216DEST_PATH_IMAGE019
when is coming into contact with
Figure 899554DEST_PATH_IMAGE020
Or
Figure 916051DEST_PATH_IMAGE021
If it is greater than zero, go to step S4, when it is
Figure 600979DEST_PATH_IMAGE020
And
Figure 310309DEST_PATH_IMAGE021
are all less than zero, step S02 is performed, wherein,
Figure 260948DEST_PATH_IMAGE022
for the corresponding time load current of the tie line C,
Figure 831869DEST_PATH_IMAGE023
a current limiting value for the line C of the interconnection line;
s02, calculating power supply margins of the interconnection line B and the interconnection line C
Figure 122036DEST_PATH_IMAGE024
And
Figure 251535DEST_PATH_IMAGE025
wherein, in the step (A),
Figure 627152DEST_PATH_IMAGE026
，
Figure 736185DEST_PATH_IMAGE027
and calculate
Figure 208754DEST_PATH_IMAGE028
When it comes to
Figure 259887DEST_PATH_IMAGE029
If greater than 0, go to step S03, when
Figure 372068DEST_PATH_IMAGE029
If the value is less than 0, executing the step S8;
s03, calculating the segmented energy conversion power respectively as follows:
Figure 534060DEST_PATH_IMAGE030
，
Figure 283972DEST_PATH_IMAGE031
when is coming into contact with
Figure 568323DEST_PATH_IMAGE032
And
Figure 918533DEST_PATH_IMAGE033
if the current values are all larger than zero, performing switch test on the corresponding connection line;
s04, when the switches pass the test, the power conversion and supply capacity is 100%;
s05, when any switch fails to pass the test, the current information of the next stage of unaffected section switches is taken to calculate the power transfer capacity as follows:
Figure 133482DEST_PATH_IMAGE034
。
optionally, step S2 is followed by:
and when the connection wiring mode of the medium-voltage line to be tested is a single radiation line, judging that the rotatable power supply capacity of the medium-voltage line to be tested is 0.
Optionally, the establishing a hash table of attribute information of a to-be-transferred line and a corresponding connection line in each medium-voltage line specifically includes:
establishing: the method comprises the following steps that a transformer substation-main transformer-10 kV line A-line A sectional switch ki-line interconnection switch LN-line B sectional switch kj-10kV line B-main transformer-transformer substation is electrically connected in a topological relation graph under a mode, and the electrical connection topological relation graph is divided into the following steps according to the number of effective interconnection points: single radiation circuit, single connection circuit and two connection circuits;
and establishing an attribute information hash table of the line to be transferred and the corresponding contact line according to the attributes of the line to be transferred and the corresponding contact line.
The second aspect of the present application provides a measurement and calculation system for the transferable power supply capacity of medium-voltage lines in a power distribution network, the system comprising:
the system comprises an establishing module, a data processing module and a data processing module, wherein the establishing module is used for establishing an attribute information hash table of a line to be transferred and a corresponding connection line in each medium-voltage line;
the judging module is used for acquiring the peak load time of the area and the peak load time of the area according to the name and the number of the medium-voltage line to be detected, writing the peak load time into an attribute information hash table of the medium-voltage line to be detected, and then determining the contact wiring mode of the medium-voltage line to be detected by reading the number of contact switches of the attribute information hash table of the medium-voltage line to be detected;
a first calculation module for calculating based on the attribute information hash information when the connection wiring mode of the medium voltage line to be measured is a single connection line
Figure 252748DEST_PATH_IMAGE001
If Δ is greater than zero, then step S4 is performed, otherwise step S8 is performed, wherein,
Figure 442421DEST_PATH_IMAGE002
the line current limiting value of the connecting line B in the medium-voltage line to be measured,
Figure 30659DEST_PATH_IMAGE003
For the corresponding time load current of the connection line B,
Figure 534453DEST_PATH_IMAGE004
The current of the line A to be transferred;
an obtaining module, configured to obtain a switching path automation switch sequence KAi from a to-be-transferred line a to a tie line B based on an attribute information hash table of a to-be-measured medium-voltage line, where an I-th switch current of the to-be-transferred line a is set to I kAi The current limiting value of the wires on both sides is I kAMi ；
Second meterA calculation module for calculating the switch of the 1 st adjacent contact point of the line A to be transferred from the switch of the line A to be transferred to the first switch of the line A to be transferred
Figure 23072DEST_PATH_IMAGE005
When is coming into contact with
Figure 383646DEST_PATH_IMAGE006
When the power supply capacity is less than 0, the rotatable power supply capacity is as follows:
Figure 708448DEST_PATH_IMAGE007
；
a third calculation module for testing the automatic switch of the 1 st adjacent contact point of the connection line B to the connection line B, and calculating the calculation until the switch of the head end of the connection line B
Figure 766665DEST_PATH_IMAGE008
When it comes to
Figure 594944DEST_PATH_IMAGE006
When the power supply capacity is less than 0, the rotatable power supply capacity is as follows:
Figure 578949DEST_PATH_IMAGE009
；
first analysis module for passing all the tests of the switch, i.e.
Figure 187785DEST_PATH_IMAGE006
If the current values are all larger than 0, the transferable power supply capacity of the line transfer circuit A to be transferred is 100 percent, and if the switch test at a certain position does not pass, namely the switch test at the certain position does not pass
Figure 298961DEST_PATH_IMAGE006
Less than 0, the transferable power supply capability of the line transfer circuit A to be transferred is
Figure 986339DEST_PATH_IMAGE010
；
A fourth calculation module for communicating with the switch
Figure 891978DEST_PATH_IMAGE011
The direction of the initial section A of the line to be transferred is subjected to the test of the transfer switch, and the test switch range is set as
Figure 988110DEST_PATH_IMAGE012
To communicate the switch
Figure 886665DEST_PATH_IMAGE011
Trend towards
Figure 689536DEST_PATH_IMAGE013
The ith automatic switch current is I kAi When it comes to
Figure 516808DEST_PATH_IMAGE014
And is provided with
Figure 100236DEST_PATH_IMAGE015
If the power conversion capability of the connection line B to the line a is:
Figure 287635DEST_PATH_IMAGE016
wherein
Figure 459860DEST_PATH_IMAGE017
The minimum value of the current limit is connected to the path switch for the connection line B.
Optionally, the method further comprises:
a fifth calculation module, configured to calculate, based on the hash information of the attribute information, the transfer margins of the lines B and C as two connection lines when the connection wiring mode of the medium-voltage line to be tested is the two connection lines
Figure 769618DEST_PATH_IMAGE018
And
Figure 778025DEST_PATH_IMAGE019
when is coming into contact with
Figure 519848DEST_PATH_IMAGE020
Or
Figure 297311DEST_PATH_IMAGE021
If the current value is larger than zero, the acquisition module is triggered, and when the current value is larger than zero, the acquisition module is triggered
Figure 964921DEST_PATH_IMAGE020
And
Figure 257362DEST_PATH_IMAGE021
are all less than zero, a sixth calculation module is triggered, wherein,
Figure 52143DEST_PATH_IMAGE022
for the corresponding time load current of the tie line C,
Figure 434845DEST_PATH_IMAGE023
a current limiting value for the line C of the interconnection line;
a sixth calculation module for calculating the power supply margin of the interconnection lines B and C
Figure 24089DEST_PATH_IMAGE024
And
Figure 256357DEST_PATH_IMAGE025
wherein, in the process,
Figure 651566DEST_PATH_IMAGE026
，
Figure 138042DEST_PATH_IMAGE027
and calculate
Figure 914499DEST_PATH_IMAGE028
When is coming into contact with
Figure 119216DEST_PATH_IMAGE029
If greater than 0, the seventh calculation module is triggered, if so
Figure 318116DEST_PATH_IMAGE029
If the current value is less than 0, triggering the fourth module;
the seventh calculation module is used for calculating the segmented energy conversion power and respectively comprises:
Figure 908366DEST_PATH_IMAGE030
，
Figure 104992DEST_PATH_IMAGE031
when is coming into contact with
Figure 547737DEST_PATH_IMAGE032
And
Figure 222432DEST_PATH_IMAGE033
if the current values are all larger than zero, performing switch test on the corresponding connection line;
the second analysis module is used for converting the power supply capacity to 100% when the switches pass the test;
the third analysis module is used for taking the current information of the next stage of unaffected section switches to calculate the power transfer capacity as follows when any switch fails the test:
Figure 745817DEST_PATH_IMAGE034
。
optionally, the method further comprises: a fourth analysis module to:
and when the connection wiring mode of the medium-voltage line to be tested is a single radiation line, judging that the rotatable power supply capacity of the medium-voltage line to be tested is 0.
Optionally, the establishing module is specifically configured to:
establishing: the method comprises the following steps that a transformer substation-main transformer-10 kV line A-line A sectional switch ki-line interconnection switch LN-line B sectional switch kj-10kV line B-main transformer-transformer substation is electrically connected in a topological relation graph under a mode, and the electrical connection topological relation graph is divided into the following steps according to the number of effective interconnection points: single radiation circuit, single connection circuit and two connection circuits;
and establishing an attribute information hash table of the line to be transferred and the corresponding contact line according to the attributes of the line to be transferred and the corresponding contact line.
The third aspect of the application provides a measurement and calculation device for the transferable power supply capacity of a medium-voltage line of a power distribution network, which comprises a processor and a memory, wherein the processor is used for:
the memory is used for storing program codes and transmitting the program codes to the processor;
the processor is configured to execute the steps of the method for estimating the transferable power supply capability of a medium voltage line in a power distribution network according to the first aspect.
A fourth aspect of the present application provides a computer-readable storage medium, which is used for storing a program code, where the program code is used for executing the method for measuring and calculating the transferable power supply capability of the medium-voltage line in the power distribution network according to the first aspect.
According to the technical scheme, the method has the following advantages:
the application provides a method for measuring and calculating the transferable power supply capacity of a medium-voltage line of a power distribution network, which is characterized in that an electrical connection topological relation graph in a mode of 'transformer substation-main transformer-10 kV line A-line A section switch ki-line interconnection switch LN-line B section switch kj-10kV line B-main transformer-transformer substation' is established based on a current power distribution network information system relation graph, a hash table of related line attributes is formed, a fully-covered power distribution automation system is utilized to collect data such as 10kV line current and line section switch current, and algorithm program measurement and calculation are respectively carried out on a single radiation line, a single interconnection line and two interconnection lines under a typical power distribution network line structure through the number of interconnection points and an anticipated power supply switch range. By means of switch testing, subsection power transfer calculation, partial power transfer calculation, current limiting condition of a power transfer path and line load condition, the situation that power transfer margin is inconsistent with actual power transfer power is effectively avoided.
Drawings
Fig. 1 is a schematic flow chart of an embodiment of a method for calculating a transferable power supply capacity of a medium voltage line in a power distribution network according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of an embodiment of a measurement and calculation system for the convertible power supply capacity of the medium voltage line in various distribution networks, according to the embodiment of the present disclosure;
fig. 3 is a schematic diagram of a line communication mode provided in the embodiment of the present application.
Detailed Description
In order to make the technical solutions of the present application better understood, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Referring to fig. 1, a method for measuring and calculating a transferable power supply capability of a medium voltage line in a power distribution network provided in an embodiment of the present application includes:
step 101, establishing an attribute information hash table of a line to be transferred and a corresponding contact line in each medium-voltage line;
it should be noted that, firstly, based on the current distribution network information system relationship diagram, an electrical connection topology relationship diagram in the mode of "transformer substation-main transformer-10 kV line a-line a section switch ki-line interconnection switch LN-line B section switch kj-10kV line B-main transformer-transformer substation" is established, and according to the electrical interconnection form of a typical distribution network, that is, the number of effective interconnection points, the method can be divided into: single radiating line, single connection line, two connection lines, as shown in fig. 3.
Then, according to the attributes of the line to be transferred and the corresponding contact line, an attribute information hash table of the line to be transferred and the corresponding contact line is established, as shown in table 1.
Table 1 attribute information hash table
Figure DEST_PATH_IMAGE035
102, according to the name and the number of a medium-voltage line to be detected, obtaining a zone to which the medium-voltage line belongs and the peak load time of the zone to which the medium-voltage line belongs, writing the peak load time into an attribute information hash table of the medium-voltage line to be detected, and then determining the contact wiring mode of the medium-voltage line to be detected by reading the number of contact switches of the attribute information hash table of the medium-voltage line to be detected;
it should be noted that, the peak load date of the area, the peak load current of the line and the sectional switch value of the line are all collected in the distribution automation system; information such as the name number of the 10kV line, the current limiting value of the line, the number of interconnection switches, the sequence of the automatic switches, the current limiting values of the wires on two sides, the power supply range boundary switch and the like is collected in the attribute information hash table established in the step 101.
In the embodiment, the name and the number of a line (to-be-measured medium-voltage line) to be measured and calculated are firstly taken, and the load peak time and the line current of a region where the line is located are determined; after a measuring and calculating program is started, the name and the number of the medium-voltage line to be measured are read, a zone to which the line belongs and the peak load time of the zone are determined through a power distribution automation system, and related data are written into an attribute information hash table of the line.
Then, judging the number of contact points of the power supply line to be switched; specifically, the number information of contact switches of an attribute information hash table of the line is read to determine a contact wiring mode of the line, wherein 0 is single radiation, 1 is single contact, 2 is two contacts, and the other contacts are atypical wirings (out of the design consideration range);
then, according to the situation of the connection wiring mode determined in the last step, if the connection wiring mode is single radiation, the transferable power supply capacity of the line is directly given to be 0; if the connection is a single connection, the step 103 is entered; if it is two contacts, step 201 is entered.
103, when the contact wiring mode of the medium-voltage line to be tested is a single contact line, calculating based on the information of the attribute information hash
Figure 300295DEST_PATH_IMAGE001
If Δ is greater than zero, step S4 is performed, otherwise step S8 is performed, wherein,
Figure 964757DEST_PATH_IMAGE002
the line current limiting value of the connecting line B in the medium-voltage line to be measured,
Figure 443143DEST_PATH_IMAGE003
For the corresponding time load current of the connection line B,
Figure 86614DEST_PATH_IMAGE004
The current of the line A to be transferred;
104, acquiring a switching path automatic switch sequence KAi from the line A to be transferred to the interconnection line B based on an attribute information hash table of the medium-voltage line to be tested, and setting the ith switch current of the line A to be transferred as I kAi The current limiting value of the wires on both sides is I kAMi ；
105, for the line A to be transferred, testing the switch of the 1 st adjacent contact point of the line A to be transferred till the switch of the head end of the line A to be transferred, and calculating
Figure 608731DEST_PATH_IMAGE005
When is coming into contact with
Figure 275336DEST_PATH_IMAGE006
When the current is less than 0, the rotatable power supply capacity is as follows:
Figure 42566DEST_PATH_IMAGE007
；
it should be noted that, for the line a to be transferred, the test is performed starting from the automation switch of the 1 st adjacent contact point of the line a to be transferred, i = (1,2,3,4, - - - - - - -) until the head switch of the line a to be transferred.
Figure 540543DEST_PATH_IMAGE005
If at all
Figure 984294DEST_PATH_IMAGE006
Greater than 0, I = I +1, and I is stored kAi To array AI 2]In, if
Figure 387462DEST_PATH_IMAGE006
Less than 0, the array AI is read]In (1) kA（i-1） The serial number i value of the switch, and the calculation of the transferable power supply capacity is as follows:
Figure 207651DEST_PATH_IMAGE036
or 100% (all A line switches passTest).
106, for the connection line B, starting to test the automatic switch close to the 1 st connection point of the connection line B until the switch at the head end of the connection line B, and calculating
Figure 260269DEST_PATH_IMAGE008
When is coming into contact with
Figure 202817DEST_PATH_IMAGE006
When the current is less than 0, the rotatable power supply capacity is as follows:
Figure 578435DEST_PATH_IMAGE009
；
it should be noted that, for the connection line B, the test is performed starting from the 1 st automation switch adjacent to the connection point of the connection line B, j = (1,2,3,4, - - - - -) until the connection line B head end switch.
Figure 186002DEST_PATH_IMAGE008
，I kA（i-1） Is obtained from array AI [ 2 ]]In, if
Figure 596255DEST_PATH_IMAGE006
Greater than 0, j = j +1, and I is stored kBj If, if
Figure 132541DEST_PATH_IMAGE006
If the value is less than 0, i = i-1, j =1 is taken and checked again until the value is checked again
Figure 57772DEST_PATH_IMAGE006
Greater than 0, and storing I at that time kA（i-1） In array BI [ ]]And calculating the rotatable power supply capacity as follows:
Figure 219763DEST_PATH_IMAGE009
。
step 107, when all the switches pass the test, that is
Figure 733790DEST_PATH_IMAGE006
All are greater than 0, the rotatable power supply capability of the line to be transferred A is obtained100% if the switch test at one of the positions fails, i.e. if the switch test at one of the positions fails
Figure 955824DEST_PATH_IMAGE006
Less than 0, the transferable power supply capability of the line transfer circuit A to be transferred is
Figure 56766DEST_PATH_IMAGE010
；
Step 108, communicating the switch
Figure 819185DEST_PATH_IMAGE011
The direction of the initial section A of the line to be transferred is subjected to the test of the transfer switch, and the test switch range is set as
Figure 938451DEST_PATH_IMAGE012
To communicate the switch
Figure 580654DEST_PATH_IMAGE011
Trend towards
Figure 418160DEST_PATH_IMAGE013
The ith automatic switch current is I kAi When is coming into contact with
Figure 672686DEST_PATH_IMAGE014
And is
Figure 708775DEST_PATH_IMAGE015
If the power conversion capability of the connection line B to the line a is:
Figure 272612DEST_PATH_IMAGE016
wherein
Figure 846681DEST_PATH_IMAGE017
The minimum value of the current limit is connected to the path switch for the connection line B.
It should be noted that, when the margin of the interconnection line B or C cannot transfer the current of the demarcation switch corresponding to the line a, the partial transfer module needs to be entered, and the process is as follows.
With interconnection switch K LB 、K LC For boundary, the testing switch range is from connecting switch to converting boundary switch LB ,K FB ]、[K LC ,K FC ]The interconnection path of (2) automation switch.
By means of a tie switch K LB Trend to K FB The ith automatic switch current is I kAi If it passes through (I) kAi +IB)＜I BM And (I) kAi +I B )＜I kBMj ,I kBMj The minimum value of the current limit of the interconnection path switch of the interconnection line B is obtained, and the power conversion capacity of the interconnection line B to the line A is beta B =I kAi /I A If not, the sectional switch current I of the previous stage is taken kA（i-1） And calculating the power conversion capacity.
Similarly, the power conversion capacity of the communication line C to the line A is beta C =I kAj /I A If the j-th stage section switch fails to pass the test, reading the j-1 stage section switch current I kA（j-1） And calculating the power conversion capacity. The circuit A under the partial transfer module can transfer power supply capacity to beta B +β C =（I kA（i-1 ）+I kA（j-1） ）/I A *100%。
Further, in an embodiment, after the step 103, the method further includes:
201. when the connection wiring mode of the medium-voltage line to be tested is two connection lines, the transfer supply margins of the lines B and C are respectively calculated as
Figure 888587DEST_PATH_IMAGE018
And
Figure 733177DEST_PATH_IMAGE019
when is coming into contact with
Figure 467915DEST_PATH_IMAGE020
Or
Figure 76751DEST_PATH_IMAGE021
If it is greater than zero, go to step 104, if it is
Figure 437194DEST_PATH_IMAGE020
And
Figure 385558DEST_PATH_IMAGE021
are both less than zero, then step 202 is performed, wherein,
Figure 41930DEST_PATH_IMAGE022
for the corresponding time load current of the tie line C,
Figure 75745DEST_PATH_IMAGE023
a current limiting value for the line C of the interconnection line;
it should be noted that when
Figure 521770DEST_PATH_IMAGE020
And
Figure 839487DEST_PATH_IMAGE021
if the number of the connection lines is larger than zero, the connection line B or the connection line C has the possibility of independently transferring the line A, and then the step 104 is executed; when in use
Figure 916028DEST_PATH_IMAGE020
And
Figure 187872DEST_PATH_IMAGE021
if both are less than zero, indicating that neither link B nor link C can independently transfer the capability of link a, step 202 is executed.
202. Calculating power supply margin of interconnection line B and interconnection line C
Figure 437587DEST_PATH_IMAGE024
And
Figure 360544DEST_PATH_IMAGE025
wherein, in the process,
Figure 857253DEST_PATH_IMAGE026
，
Figure 865660DEST_PATH_IMAGE027
and calculate
Figure 919067DEST_PATH_IMAGE028
When is coming into contact with
Figure 447263DEST_PATH_IMAGE029
If greater than 0, go to step 203, if yes
Figure 865606DEST_PATH_IMAGE029
If less than 0, go to step 108;
203. calculating the segmented energy conversion power respectively as follows:
Figure 344997DEST_PATH_IMAGE030
，
Figure 139778DEST_PATH_IMAGE031
when is coming into contact with
Figure 510761DEST_PATH_IMAGE032
And
Figure 162323DEST_PATH_IMAGE033
if the current values are all larger than zero, performing switch test on the corresponding connection line;
204. when the switches pass the test, the power conversion capacity is 100%;
205. when any switch fails the test, the current information of the next stage of unaffected section switches is taken to calculate the power transfer capacity as follows:
Figure 145322DEST_PATH_IMAGE034
。
the above is a method for measuring and calculating a transferable power supply capacity of a medium-voltage line of a power distribution network provided in the embodiment of the present application, and the following is a system for measuring and calculating a transferable power supply capacity of a medium-voltage line of a power distribution network provided in the embodiment of the present application.
Referring to fig. 2, a system for measuring and calculating a transferable power supply capability of a medium-voltage line of a power distribution network provided in an embodiment of the present application includes:
an establishing module 301, configured to establish an attribute information hash table between a to-be-transferred line and a corresponding connection line in each medium-voltage line;
the judging module 302 is configured to obtain the belonging section and the peak load time of the belonging section according to the name and the number of the medium-voltage line to be tested, write the peak load time into the attribute information hash table of the medium-voltage line to be tested, and determine the connection mode of the medium-voltage line to be tested by reading the number of connection switches in the attribute information hash table of the medium-voltage line to be tested;
a first calculating module 303, configured to calculate, based on the information of the attribute information hash, when the connection wiring mode of the medium-voltage line to be tested is a single connection line
Figure 727482DEST_PATH_IMAGE018
When it comes to
Figure 213958DEST_PATH_IMAGE020
Greater than zero, the acquisition module 304 is triggered, otherwise the fourth calculation module 308 is triggered, wherein,
Figure 990415DEST_PATH_IMAGE002
the line current limiting value of the connecting line B in the medium-voltage line to be tested,
Figure 257449DEST_PATH_IMAGE003
For the corresponding time load current of the connection line B,
Figure 128453DEST_PATH_IMAGE004
The current of the line A to be transferred;
an obtaining module 304, configured to obtain a switching path automation switch sequence KAi from the to-be-transferred line a to the interconnection line B based on an attribute information hash table of the to-be-measured medium-voltage line, where an I-th switch current of the to-be-transferred line a is set to I kAi The current limiting value of the wires on both sides is I kAMi ；
A second calculating module 305, configured to calculate, for the to-be-transferred route a, a calculation from the switch at the 1 st adjacent contact point of the to-be-transferred route a to the switch at the head end of the to-be-transferred route a
Figure 984282DEST_PATH_IMAGE005
When is coming into contact with
Figure 180908DEST_PATH_IMAGE006
When the power supply capacity is less than 0, the rotatable power supply capacity is as follows:
Figure 358074DEST_PATH_IMAGE007
；
a third calculation module 306 for calculating, for the interconnection line B, the calculation from the 1 st automation switch close to the interconnection point of the interconnection line B to the head end switch of the interconnection line B
Figure 298348DEST_PATH_IMAGE008
When is coming into contact with
Figure 821733DEST_PATH_IMAGE006
When the power supply capacity is less than 0, the rotatable power supply capacity is as follows:
Figure 172949DEST_PATH_IMAGE009
；
first analysis module 307 for passing all the tests of the switch, i.e.
Figure 352258DEST_PATH_IMAGE006
If the current values are all larger than 0, the transferable power supply capacity of the line transfer circuit A to be transferred is 100 percent, and if the switch test at a certain position does not pass, namely the switch test at the certain position does not pass
Figure 581376DEST_PATH_IMAGE006
Less than 0, the transferable power supply capability of the line transfer circuit A to be transferred is
Figure 959268DEST_PATH_IMAGE010
；
A fourth calculation module 308 for communicating with the switch
Figure 497697DEST_PATH_IMAGE011
The direction of the initial section A of the line to be transferred is subjected to the test of the transfer switch, and the test switch range is set as
Figure 147990DEST_PATH_IMAGE012
To communicate the switch
Figure 430066DEST_PATH_IMAGE011
Trend towards
Figure 616459DEST_PATH_IMAGE013
The ith automatic switch current is I kAi When is coming into contact with
Figure 60210DEST_PATH_IMAGE014
And is
Figure 276428DEST_PATH_IMAGE015
If the power conversion capability of the connection line B to the line a is:
Figure 345884DEST_PATH_IMAGE016
wherein
Figure 636051DEST_PATH_IMAGE017
The minimum value of the current limit is connected to the path switch for the connection line B.
Further, the embodiment of the present application further provides a measurement and calculation device for the transferable power supply capability of the medium-voltage line in the power distribution network, where the device includes a processor and a memory:
the memory is used for storing program codes and transmitting the program codes to the processor;
the processor is used for executing the method for calculating the transferable power supply capacity of the medium-voltage line of the power distribution network in the embodiment of the method according to the instructions in the program code.
Further, an embodiment of the present application further provides a computer-readable storage medium, where the computer-readable storage medium is used for storing program codes, and the program codes are used for executing the method for measuring and calculating the transferable power supply capability of the medium-voltage line in the power distribution network described in the above method embodiment.
It can be clearly understood by those skilled in the art that, for convenience and simplicity of description, the specific working processes of the above-described systems and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
The terms "first," "second," "third," "fourth," and the like in the description of the application and the above-described figures, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
It should be understood that in the present application, "at least one" means one or more, "a plurality" means two or more. "and/or" for describing an association relationship of associated objects, indicating that there may be three relationships, e.g., "a and/or B" may indicate: only A, only B and both A and B are present, wherein A and B may be singular or plural. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. "at least one of the following" or similar expressions refer to any combination of these items, including any combination of the singular or plural items. For example, at least one (one) of a, b, or c, may represent: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", wherein a, b and c may be single or plural.
In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one type of logical functional division, and other divisions may be realized in practice, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit may be implemented in the form of hardware, or may also be implemented in the form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application may be substantially implemented or contributed to by the prior art, or all or part of the technical solution may be embodied in a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.
The above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.

Claims (10)

1. A method for measuring and calculating the rotatable power supply capacity of a medium-voltage line of a power distribution network is characterized by comprising the following steps:
s1, establishing an attribute information hash table of a line to be transferred and a corresponding contact line in each medium-voltage line;
s2, according to the name and the number of the medium-voltage line to be detected, obtaining the peak load time of the area and writing the peak load time into an attribute information hash table of the medium-voltage line to be detected, and then determining a connection wiring mode of the medium-voltage line to be detected by reading the number of connection switches of the attribute information hash table of the medium-voltage line to be detected;
s3, when the contact wiring mode of the medium-voltage line to be tested is a single contact line, calculating based on the information of the attribute information hash
Figure 761964DEST_PATH_IMAGE001
If Δ is greater than zero, step S4 is performed, otherwise step S8 is performed, wherein,
Figure 199899DEST_PATH_IMAGE002
the line current limiting value of the connecting line B in the medium-voltage line to be measured,
Figure 823778DEST_PATH_IMAGE003
For the corresponding time load current of the connection line B,
Figure 719184DEST_PATH_IMAGE004
The current of the line A to be transferred;
s4, acquiring a transfer path automatic switch sequence KAi from the line A to be transferred to the connection line B based on an attribute information hash table of the medium-voltage line to be measured, and setting the ith switch current of the line A to be transferred as I kAi The current limiting value of the wires on both sides is I kAMi ；
S5, for the line A to be transferred, testing is carried out from the switch of the 1 st adjacent contact point of the line A to be transferred until the switch of the head end of the line A to be transferred, and calculation is carried out
Figure 832633DEST_PATH_IMAGE005
When is coming into contact with
Figure 695547DEST_PATH_IMAGE006
When the power supply capacity is less than 0, the rotatable power supply capacity is as follows:
Figure 106806DEST_PATH_IMAGE007
；
s6, for the interconnection line B, testing is carried out from the 1 st automatic switch close to the interconnection point of the interconnection line B until the head end switch of the interconnection line B, and calculation is carried out
Figure 433882DEST_PATH_IMAGE008
When it comes to
Figure 655916DEST_PATH_IMAGE006
When the power supply capacity is less than 0, the rotatable power supply capacity is as follows:
Figure 491279DEST_PATH_IMAGE009
；
s7, when all the switches pass the test, namely
Figure 519278DEST_PATH_IMAGE006
If the current values are all larger than 0, the rotatable power supply capacity of the line to be transferred A is 100 percent, and if the switch test at a certain position does not pass, namely the test is finished
Figure 638544DEST_PATH_IMAGE006
Less than 0, the transferable power supply capability of the line transfer circuit A to be transferred is
Figure 93796DEST_PATH_IMAGE010
；
S8, communicating switch
Figure 180569DEST_PATH_IMAGE011
The direction of the initial section A of the line to be transferred is subjected to the test of the transfer switch, and the test switch range is set as
Figure 684363DEST_PATH_IMAGE012
To communicate the switch
Figure 720452DEST_PATH_IMAGE011
Trend towards
Figure 35021DEST_PATH_IMAGE013
The ith automatic switch current is I kAi When is coming into contact with
Figure 94244DEST_PATH_IMAGE014
And is
Figure 464045DEST_PATH_IMAGE015
If the power conversion capability of the connection line B to the line a is:
Figure 807171DEST_PATH_IMAGE016
wherein
Figure 541909DEST_PATH_IMAGE017
The minimum value of the current limit is connected to the path switch for the connection line B.
2. The method for measuring and calculating the transferable power supply capability of the medium-voltage line of the power distribution network according to claim 1, wherein the step S2 is followed by further comprising the following steps:
s01, when the communication of the medium voltage line to be testedWhen the wiring mode is two connection lines, based on the hash information of the attribute information, the transfer supply margins of the lines B and C are calculated to be respectively
Figure 150744DEST_PATH_IMAGE018
And
Figure 758792DEST_PATH_IMAGE019
when it comes to
Figure 769473DEST_PATH_IMAGE020
Or
Figure 675112DEST_PATH_IMAGE021
If it is greater than zero, go to step S4, when it is
Figure 771244DEST_PATH_IMAGE020
And
Figure 669799DEST_PATH_IMAGE021
are all less than zero, step S02 is performed, wherein,
Figure 738249DEST_PATH_IMAGE022
for the corresponding time load current of the tie line C,
Figure 565522DEST_PATH_IMAGE023
a current limiting value for the line C of the interconnection line;
s02, calculating power supply margins of the interconnection line B and the interconnection line C
Figure 883371DEST_PATH_IMAGE024
And
Figure 336349DEST_PATH_IMAGE025
wherein, in the step (A),
Figure 508573DEST_PATH_IMAGE026
，
Figure 818332DEST_PATH_IMAGE027
and calculate
Figure 561160DEST_PATH_IMAGE028
When is coming into contact with
Figure 614567DEST_PATH_IMAGE029
If greater than 0, go to step S03, when
Figure 142762DEST_PATH_IMAGE029
If the value is less than 0, executing the step S8;
s03, calculating the segmented energy conversion power respectively as follows:
Figure 561105DEST_PATH_IMAGE030
，
Figure 119125DEST_PATH_IMAGE031
when is coming into contact with
Figure 897594DEST_PATH_IMAGE032
And
Figure 795143DEST_PATH_IMAGE033
if the current values are all larger than zero, performing switch test on the corresponding connection line;
s04, when the switches pass the test, the power conversion and supply capacity is 100%;
s05, when any switch fails to pass the test, the current information of the next stage of unaffected section switches is taken to calculate the power transfer capacity as follows:
Figure 446705DEST_PATH_IMAGE034
。
3. the method for measuring and calculating the transferable power supply capacity of the medium-voltage line in the power distribution network according to claim 1, wherein the step S2 is followed by further comprising:
and when the connection wiring mode of the medium-voltage line to be tested is a single radiation line, judging that the rotatable power supply capacity of the medium-voltage line to be tested is 0.
4. The method for measuring and calculating the transferable power supply capacity of the medium-voltage lines of the power distribution network according to claim 1, wherein the establishing of the attribute information hash table of the lines to be transferred and the corresponding contact lines in each medium-voltage line specifically comprises:
establishing: the method comprises the following steps that a transformer substation-main transformer-10 kV line A-line A sectional switch ki-line interconnection switch LN-line B sectional switch kj-10kV line B-main transformer-transformer substation is electrically connected in a topological relation graph under a mode, and the electrical connection topological relation graph is divided into the following steps according to the number of effective interconnection points: single radiation circuit, single connection circuit and two connection circuits;
and establishing an attribute information hash table of the line to be transferred and the corresponding contact line according to the attributes of the line to be transferred and the corresponding contact line.
5. A system for measuring and calculating the rotatable power supply capacity of a medium-voltage line of a power distribution network is characterized by comprising:
the system comprises an establishing module, a data processing module and a data processing module, wherein the establishing module is used for establishing an attribute information hash table of a line to be transferred and a corresponding connection line in each medium-voltage line;
the judging module is used for acquiring peak load time of the area and the serial number of the medium-voltage line to be detected, writing the peak load time into an attribute information hash table of the medium-voltage line to be detected, and then determining a connection wiring mode of the medium-voltage line to be detected by reading the number of connection switches of the attribute information hash table of the medium-voltage line to be detected;
a first calculation module for calculating based on the hash information of the attribute information when the connection wiring mode of the medium voltage line to be measured is a single connection line
Figure 914857DEST_PATH_IMAGE001
If Δ is greater than zero, step S4 is performed, otherwise step S8 is performed, wherein,
Figure 310066DEST_PATH_IMAGE002
the line current limiting value of the connecting line B in the medium-voltage line to be measured,
Figure 62122DEST_PATH_IMAGE003
For the corresponding time load current of the connection line B,
Figure 71535DEST_PATH_IMAGE004
The current of the line A to be transferred;
an obtaining module, configured to obtain a switching path automation switch sequence KAi from a to-be-transferred line a to a tie line B based on an attribute information hash table of a to-be-measured medium-voltage line, where an I-th switch current of the to-be-transferred line a is set to I kAi The current limiting value of the wires on both sides is I kAMi ；
The second calculation module is used for testing the line A to be transferred from the 1 st switch close to the contact point of the line A to be transferred until the head end switch of the line A to be transferred, and calculating
Figure 338568DEST_PATH_IMAGE005
When is coming into contact with
Figure 475152DEST_PATH_IMAGE006
When the power supply capacity is less than 0, the rotatable power supply capacity is as follows:
Figure 832446DEST_PATH_IMAGE007
；
a third calculation module for calculating the first and second calculation results of the automatic switch of the 1 st adjacent contact point of the contact line B
Figure 825810DEST_PATH_IMAGE008
When is coming into contact with
Figure 517822DEST_PATH_IMAGE006
When the power supply capacity is less than 0, the rotatable power supply capacity is as follows:
Figure 520413DEST_PATH_IMAGE009
；
first analysis module for passing all the tests of the switch, i.e.
Figure 230749DEST_PATH_IMAGE006
If the current values are all larger than 0, the transferable power supply capacity of the line transfer circuit A to be transferred is 100 percent, and if the switch test at a certain position does not pass, namely the switch test at the certain position does not pass
Figure 332697DEST_PATH_IMAGE006
Less than 0, the transferable power supply capability of the line transfer circuit A to be transferred is
Figure 574323DEST_PATH_IMAGE010
；
A fourth calculation module for communicating with the switch
Figure 803441DEST_PATH_IMAGE011
The direction of the initial section A of the line to be transferred is subjected to the test of the transfer switch, and the test switch range is set as
Figure 181333DEST_PATH_IMAGE012
To communicate the switch
Figure 719761DEST_PATH_IMAGE011
Trend towards
Figure 370055DEST_PATH_IMAGE013
The ith automatic switch current is I kAi When it comes to
Figure 714448DEST_PATH_IMAGE014
And is
Figure 884530DEST_PATH_IMAGE015
If the power conversion capability of the connection line B to the line a is:
Figure 344592DEST_PATH_IMAGE016
wherein
Figure 232914DEST_PATH_IMAGE017
The minimum value of the current limit is connected to the path switch for the connection line B.
6. The system for estimating the transferable power supply capability of medium voltage lines in power distribution networks according to claim 5, characterized by further comprising:
a fifth calculation module, configured to calculate, based on the hash information of the attribute information, the transfer margins of the lines B and C as two connection lines when the connection wiring mode of the medium-voltage line to be tested is the two connection lines
Figure 115419DEST_PATH_IMAGE018
And
Figure 654854DEST_PATH_IMAGE019
when is coming into contact with
Figure 597402DEST_PATH_IMAGE020
Or
Figure 973019DEST_PATH_IMAGE021
If it is greater than zero, go to step S4, when it is
Figure 659216DEST_PATH_IMAGE020
And
Figure 554622DEST_PATH_IMAGE021
are all less than zero, step S02 is performed, wherein,
Figure 605754DEST_PATH_IMAGE022
for the corresponding time load current of the tie line C,
Figure 530985DEST_PATH_IMAGE023
a current limiting value for the line C of the interconnection line;
a sixth calculating module for calculating the power supply margin of the interconnection lines B and C
Figure 942244DEST_PATH_IMAGE024
And
Figure 269320DEST_PATH_IMAGE025
wherein, in the step (A),
Figure 225774DEST_PATH_IMAGE026
，
Figure 314998DEST_PATH_IMAGE027
and calculate
Figure 342997DEST_PATH_IMAGE028
When is coming into contact with
Figure 462263DEST_PATH_IMAGE029
If greater than 0, the seventh calculation module is triggered, if so
Figure 917515DEST_PATH_IMAGE029
If the current value is less than 0, triggering the fourth module;
the seventh calculation module is used for calculating the segmented energy conversion power and respectively comprises:
Figure 738709DEST_PATH_IMAGE030
，
Figure 242503DEST_PATH_IMAGE031
when is coming into contact with
Figure 544171DEST_PATH_IMAGE032
And
Figure 858740DEST_PATH_IMAGE033
if the current values are larger than zero, performing switch test on the corresponding connection lines;
the second analysis module is used for converting the power supply capacity to 100% when the switches pass the test;
the third analysis module is used for taking the current information of the next stage of unaffected section switches to calculate the power transfer capacity as follows when any switch fails the test:
Figure 980280DEST_PATH_IMAGE034
。
7. the system for estimating the transferable power supply capability of medium voltage lines in power distribution networks according to claim 5, characterized by further comprising: a fourth analysis module to:
and when the connection wiring mode of the medium-voltage line to be tested is a single radiation line, judging that the rotatable power supply capacity of the medium-voltage line to be tested is 0.
8. The system for calculating the transferable power supply capability of medium-voltage lines in power distribution networks according to claim 5, wherein the establishing module is specifically configured to:
establishing: the method comprises the following steps that a transformer substation-main transformer-10 kV line A-line A sectional switch ki-line interconnection switch LN-line B sectional switch kj-10kV line B-main transformer-transformer substation is electrically connected in a topological relation graph under a mode, and the electrical connection topological relation graph is divided into the following steps according to the number of effective interconnection points: single radiation circuit, single connection circuit and two connection circuits;
and establishing an attribute information hash table of the line to be transferred and the corresponding contact line according to the attributes of the line to be transferred and the corresponding contact line.
9. A measurement and calculation device for the convertible power supply capacity of medium voltage lines of a distribution network, characterized in that it comprises a processor and a memory:
the memory is used for storing program codes and transmitting the program codes to the processor;
the processor is used for executing the method for measuring and calculating the transferable power supply capacity of the medium-voltage line in the power distribution network according to the instructions in the program code, wherein the method is as defined in any one of claims 1 to 4.
10. A computer-readable storage medium, characterized in that it is used to store a program code for implementing the method for estimating the transferable power of medium voltage lines of an electric distribution network according to any of claims 1-4.
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