CN115313370B - Power distribution network load superposition analysis method - Google Patents

Power distribution network load superposition analysis method Download PDF

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CN115313370B
CN115313370B CN202210996559.9A CN202210996559A CN115313370B CN 115313370 B CN115313370 B CN 115313370B CN 202210996559 A CN202210996559 A CN 202210996559A CN 115313370 B CN115313370 B CN 115313370B
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load
superposition
heavy
time
analysis
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CN115313370A (en
Inventor
王子瑜
王璨
李怀龙
胡建忠
汪文豪
程鹏
范荣琴
夏军
周明涛
张悦
李娟�
张海涛
鲁军
于洋
何益祥
钱文静
张婉
陈炎
李博逊
李亚
郑欣欣
胡伟
李攀峰
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Chaou Power Supply Co of State Grid Anhui Electric Power Co Ltd
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Chaou Power Supply Co of State Grid Anhui Electric Power 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
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F16/00—Information retrieval; Database structures therefor; File system structures therefor
    • G06F16/20—Information retrieval; Database structures therefor; File system structures therefor of structured data, e.g. relational data
    • G06F16/26—Visual data mining; Browsing structured data
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
    • H02J13/00001—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by the display of information or by user interaction, e.g. supervisory control and data acquisition systems [SCADA] or graphical user interfaces [GUI]
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
    • H02J13/00002—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by monitoring
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
    • H02J13/00032—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S10/00—Systems supporting electrical power generation, transmission or distribution
    • Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Databases & Information Systems (AREA)
  • Theoretical Computer Science (AREA)
  • Human Computer Interaction (AREA)
  • Data Mining & Analysis (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Abstract

The invention discloses a power distribution network load superposition analysis method, which comprises the following steps: 1. selecting lines and time periods to be analyzed, and then selecting time intervals to carry out superposition calculation on the current loads of the lines at corresponding time points; 2. generating a superposition curve according to the superposition calculation result of the current loads of all the lines at each moment; 3. selecting a loaded line, determining all heavy load sections on the line according to the set heavy load value, and marking; 4. and analyzing on the basis of the calculation and automatically marking the analysis result on the drawn curve. According to the method, the simultaneous rate estimation is not needed to be considered, the calculation result is accurate, multidimensional analysis and visual display of average load, heavy-load sections and the like are realized, the lines and the section sections needing to be overlapped can be selected independently, the analysis precision of transferring the section load is high, and the estimation is accurate.

Description

Power distribution network load superposition analysis method
Technical Field
The invention belongs to the technical field of power distribution networks, and particularly relates to a power distribution network load superposition analysis method.
Background
The network of the distribution network is complex, the equipment quantity is large, and the change is frequent, so that a plurality of problems exist for analysis and control of the network of the distribution network. Among these problems are: 1. in the calculation of power distribution network load analysis and transfer, because the load characteristics of each power distribution network line are inconsistent, the load curve, the load rule and the maximum load time of the line are different, in the calculation of traditional load transfer, the calculation result often has errors by combining the capacity or the maximum load of the line and the load timing rate, and the calculation result needs to be amplified for analysis in actual work, so that the economy is insufficient. 2. In the calculation of load transfer, the load of the distribution network outlet switch of the transformer substation is only used for analysis, the analysis precision is poor, and the section load transfer cannot be estimated accurately.
Disclosure of Invention
The invention aims to provide a power distribution network load superposition analysis method which is used for solving the technical problems that in the prior art, the analysis error is large, the safety margin is required to be amplified in work, and the section load transfer result cannot be estimated accurately.
The power distribution network load superposition analysis method comprises the following steps.
1. And selecting a line and a time period to be analyzed, and then selecting a time interval to carry out superposition calculation on the current load of each line at each corresponding time.
2. And generating a superposition curve according to the superposition calculation result of the current loads of the lines at each moment.
3. And selecting a loaded line, and determining and marking all heavy load sections on the line according to the set heavy load value.
4. And analyzing on the basis of the calculation and automatically marking the analysis result on the drawn curve.
Preferably, the first step includes: setting the number of switches to n in the calculation, and respectively representing corresponding superimposed circuits as
Figure DEST_PATH_IMAGE001
Corresponding time is
Figure DEST_PATH_IMAGE002
The time interval is selected as
Figure DEST_PATH_IMAGE003
The time calculation formula is
Figure DEST_PATH_IMAGE004
，
Figure DEST_PATH_IMAGE005
And so on. Let the ith line, current at time j be expressed as
Figure DEST_PATH_IMAGE006
The total superimposed current is expressed as
Figure DEST_PATH_IMAGE007
。
Preferably, the second step includes: the current superimposed at moment j is calculated as
Figure DEST_PATH_IMAGE008
To
Figure DEST_PATH_IMAGE009
In the horizontal direction of the axis of abscissa,
Figure DEST_PATH_IMAGE010
plotting the ordinate as the point coordinates
Figure DEST_PATH_IMAGE011
Drawing corresponding superposition curves according to coordinate points at each moment to obtain average load
Figure DEST_PATH_IMAGE012
And marked on the curve so that the total superimposed current is expressed as
Figure 812420DEST_PATH_IMAGE007
。
Preferably, the third step includes: after selecting the line with load, the rated current of the line is read from the system
Figure DEST_PATH_IMAGE013
The method comprises the steps of carrying out a first treatment on the surface of the Setting a heavy load value
Figure DEST_PATH_IMAGE014
，
Figure 708701DEST_PATH_IMAGE014
Not greater than
Figure 82176DEST_PATH_IMAGE013
The method comprises the steps of carrying out a first treatment on the surface of the Make heavy load labeling and will
Figure 433523DEST_PATH_IMAGE010
And (3) with
Figure 254848DEST_PATH_IMAGE014
One by one, if
Figure DEST_PATH_IMAGE015
,
Figure DEST_PATH_IMAGE016
Then
Figure DEST_PATH_IMAGE017
Marked as heavy-load section start point, if
Figure DEST_PATH_IMAGE018
,
Figure DEST_PATH_IMAGE019
Then will this point
Figure DEST_PATH_IMAGE020
Marked as heavy-duty zone end, slave
Figure DEST_PATH_IMAGE021
Start traversing to
Figure DEST_PATH_IMAGE022
All heavy-duty sections are noted.
Preferably, the analysis method adopted in the fourth step includes analysis of the heavy load time length, and accumulation of each heavy load time length
Figure DEST_PATH_IMAGE023
Each heavy load time is equal to the heavy load end time minus the start time
Figure DEST_PATH_IMAGE024
。
Preferably, the analysis method adopted in the fourth step comprises maximum load composition analysis, and the superimposed current is selected
Figure 227090DEST_PATH_IMAGE010
Maximum time of day
Figure DEST_PATH_IMAGE025
And calculating the load composition of the circuit at the moment, generating the duty ratio and sequencing the loads.
Preferably, the analysis method adopted in the fourth step includes load fluctuation analysis, in which the load current result is superimposed, the average load is taken as a reference, and the fluctuation analysis is performed on all load sampling points on the superimposed curve in a normal distribution mode.
The invention has the following advantages: the invention provides a power distribution network load superposition analysis method. And by utilizing a big data technology, a plurality of distribution network load data are overlapped and calculated, a curve after overlapping is automatically generated, the estimation of the synchronous rate is not needed to be considered, and the calculation result is accurate. Therefore, the problem of large analysis error in the prior art is solved, the safety margin is not required to be excessively amplified in operation, and the economical efficiency is improved.
Based on the load superposition result, the loaded line can be selected autonomously, and multidimensional analysis and visual display of average load, heavy load sections and the like are realized. The method can autonomously select lines and interval sections to be overlapped. The method can automatically select the sections needing to be overlapped, and can analyze and display each heavy-load section exceeding the heavy-load value, so that the analysis precision of the section load transfer is high, and the estimation is accurate.
Drawings
Fig. 1 is a flowchart of a method for analyzing load superposition of a power distribution network according to the present invention.
FIG. 2 is an interface diagram of the present invention for generating a superimposed curve.
Detailed Description
The following detailed description of the embodiments of the invention, given by way of example only, is presented in the accompanying drawings to aid in a more complete, accurate, and thorough understanding of the inventive concepts and aspects of the invention by those skilled in the art.
As shown in fig. 1-2, the present invention provides a power distribution network load superposition analysis method, which includes:
1. and selecting a line and a time period to be analyzed, and then selecting a time interval to carry out superposition calculation on the current load of each line at each corresponding time.
Setting the number of switches to n in the calculation, and respectively representing corresponding superimposed circuits as
Figure 320817DEST_PATH_IMAGE001
Corresponding time is
Figure 475855DEST_PATH_IMAGE002
The time interval is selected as
Figure 633910DEST_PATH_IMAGE003
The time calculation formula is
Figure 216201DEST_PATH_IMAGE004
，
Figure 813536DEST_PATH_IMAGE005
And so on. Let the ith line, current at time j be expressed as
Figure 755953DEST_PATH_IMAGE006
。
2. And generating a superposition curve according to the superposition calculation result of the current loads of the lines at each moment.
The current superimposed at moment j is calculated as
Figure 551871DEST_PATH_IMAGE008
To
Figure 773904DEST_PATH_IMAGE009
In the horizontal direction of the axis of abscissa,
Figure 609268DEST_PATH_IMAGE010
plotting the ordinate as the point coordinates
Figure 106108DEST_PATH_IMAGE011
Drawing corresponding superposition curves according to coordinate points at each moment to obtain average load
Figure 22111DEST_PATH_IMAGE012
And marked on the curve. Such that the total superimposed current is expressed as
Figure 929893DEST_PATH_IMAGE007
。
3. And selecting a loaded line, and determining and marking all heavy load sections on the line according to the set heavy load value.
After selecting the line with load, the rated current of the line is read from the system
Figure 501820DEST_PATH_IMAGE013
The method comprises the steps of carrying out a first treatment on the surface of the Setting a heavy load value
Figure DEST_PATH_IMAGE026
。
Make heavy load labeling and will
Figure 487837DEST_PATH_IMAGE010
And (3) with
Figure 258347DEST_PATH_IMAGE014
One by one, if
Figure 540293DEST_PATH_IMAGE015
,
Figure 661833DEST_PATH_IMAGE016
Then
Figure 500476DEST_PATH_IMAGE017
Marked as heavy-load section start point, if
Figure 813908DEST_PATH_IMAGE018
,
Figure 548645DEST_PATH_IMAGE019
Then will this point
Figure 891902DEST_PATH_IMAGE020
Marked as heavy-duty zone end, slave
Figure DEST_PATH_IMAGE027
Start traversing to
Figure 455607DEST_PATH_IMAGE022
All heavy-duty sections are noted.
4. And analyzing on the basis of the calculation and automatically marking the analysis result on the drawn curve.
The analysis method comprises the following steps: and (5) analyzing the heavy load duration. Accumulating each heavy load time
Figure 935130DEST_PATH_IMAGE023
Each heavy load time is equal to the heavy load end time minus the start time
Figure 385310DEST_PATH_IMAGE024
。
Maximum load composition analysis. Selecting superimposed currents
Figure 153546DEST_PATH_IMAGE010
Maximum time of day
Figure 599571DEST_PATH_IMAGE025
And calculating the load composition of the circuit at the moment, generating the duty ratio and sequencing the loads.
And (5) load fluctuation analysis. And carrying out fluctuation analysis on all load sampling points on the superimposed curve in a normal distribution mode by taking the superimposed load current result and the average load as a reference.
While the invention has been described above with reference to the accompanying drawings, it will be apparent that the invention is not limited to the above embodiments, but is capable of being modified or applied to other applications without modification, as long as various insubstantial modifications of the inventive concept and technical solutions are adopted, all within the scope of the invention.

Claims (4)

1. A power distribution network load superposition analysis method is characterized by comprising the following steps of: comprises the following steps:
1. selecting lines and time periods to be analyzed, and then selecting time intervals to carry out superposition calculation on the current loads of the lines at corresponding time points;
2. generating a superposition curve according to the superposition calculation result of the current loads of all lines at all times;
3. selecting a loaded line, determining all heavy load sections on the line according to the set heavy load value, and marking;
4. analyzing on the basis of the calculation and automatically marking an analysis result on the drawn curve;
the first step comprises the following steps: setting the switch number in the calculation to be
Figure QLYQS_1
The corresponding superimposed lines are denoted +.>
Figure QLYQS_5
The corresponding time is +.>
Figure QLYQS_8
The time interval is chosen to be +.>
Figure QLYQS_2
The time calculation formula is +.>
Figure QLYQS_4
，/>
Figure QLYQS_7
And so on; let go of>
Figure QLYQS_9
A line, in->
Figure QLYQS_3
The time current is denoted +.>
Figure QLYQS_6
；
The second step comprises the following steps: through the above formula
Figure QLYQS_10
The superimposed current at the moment is +.>
Figure QLYQS_11
To->
Figure QLYQS_12
On the abscissa, +.>
Figure QLYQS_13
Plotting on the ordinate, the point is +.>
Figure QLYQS_14
Drawing corresponding superposition curves according to coordinate points at each moment to obtain average load +.>
Figure QLYQS_15
And marked on the curve so that the total superimposed current is denoted +.>
Figure QLYQS_16
；
The third step comprises the following steps: after selecting the line with load, the rated current of the line is read from the system
Figure QLYQS_19
The method comprises the steps of carrying out a first treatment on the surface of the Setting a heavy load value
Figure QLYQS_23
Not more than->
Figure QLYQS_27
The method comprises the steps of carrying out a first treatment on the surface of the Make heavy load labeling, will->
Figure QLYQS_18
And->
Figure QLYQS_21
One by one, if->
Figure QLYQS_25
,/>
Figure QLYQS_28
Then
Figure QLYQS_17
Marked as heavy-duty zone start point, if +.>
Figure QLYQS_22
,/>
Figure QLYQS_26
Then the point is +>
Figure QLYQS_29
Marked as heavy-duty zone end, from->
Figure QLYQS_20
Start traversing to->
Figure QLYQS_24
All heavy-duty sections are noted.
2. The power distribution network load superposition analysis method according to claim 1, wherein: the analysis method adopted in the fourth step comprises the steps of analyzing the heavy-load time length, and accumulating each section of heavy-load time
Figure QLYQS_30
Each heavy load time is equal to the weightLoad end time minus start time +.>
Figure QLYQS_31
。
3. The power distribution network load superposition analysis method according to claim 1, wherein: the analysis method adopted in the fourth step comprises maximum load composition analysis, and superposition current is selected
Figure QLYQS_32
Maximum time->
Figure QLYQS_33
And calculating the load composition of the circuit at the moment, generating the duty ratio and sequencing the loads.
4. The power distribution network load superposition analysis method according to claim 1, wherein: the analysis method adopted in the fourth step comprises load fluctuation analysis, wherein the load current result is overlapped, the average load is taken as a reference, and the fluctuation analysis is carried out on all load sampling points on the overlapped curve in a normal distribution mode.
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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104218672A (en) * 2014-07-11 2014-12-17 国家电网公司 Real-time running status evaluation based power distribution network running risk warning system
WO2022105944A1 (en) * 2020-11-18 2022-05-27 国网青海省电力公司经济技术研究院 A method for calculating optimal load capacity of 10 kv feeder taking into account impact of different load structures and reliabilities

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Publication number Priority date Publication date Assignee Title
CN106899014B (en) * 2015-12-18 2020-02-18 国网冀北电力有限公司张家口供电公司 Modeling prediction method of electrified railway load based on waveform decomposition
CN107017629B (en) * 2017-05-16 2019-08-20 国网四川省电力公司资阳供电公司 A kind of distribution surplus capacity dynamic analysis system
CN110490464B (en) * 2019-08-21 2023-01-20 国网浙江省电力有限公司杭州供电公司 Urban power distribution network power supply capacity diving method based on line load recombination
CN112685462B (en) * 2020-12-21 2024-01-19 深圳供电局有限公司 Feeder line data analysis method, feeder line data analysis device, computer equipment and storage medium
CN114912679A (en) * 2022-05-11 2022-08-16 广西电网有限责任公司 Load prediction method based on multi-industry historical typical load curve superposition

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104218672A (en) * 2014-07-11 2014-12-17 国家电网公司 Real-time running status evaluation based power distribution network running risk warning system
WO2022105944A1 (en) * 2020-11-18 2022-05-27 国网青海省电力公司经济技术研究院 A method for calculating optimal load capacity of 10 kv feeder taking into account impact of different load structures and reliabilities

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