CN112132701B - Openable capacity calculation method based on one power grid diagram - Google Patents
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Abstract
The invention discloses an open-able capacity calculation method based on one graph of a power grid. The openable capacity calculation method is based on one graph of a regulation cloud power grid, realizes power supply path navigation by utilizing a graph calculation technology, and searches main transformers of 110 kilovolt, 220 kilovolt or even 500 kilovolt power supply paths along the way by taking distribution network transformers with access requirements of users as starting points; model data and historical operation data of a 10 KV distribution network trunk line are obtained based on a regulation cloud power grid map database, and on the basis, the openable capacity value is calculated on line by combining with multi-source data such as allowable current-carrying capacity of power grid equipment, newly-increased standby power capacity and rated capacity of a main transformer, and an optimal power supply scheme is provided.
Description
Technical Field
The invention relates to a calculation method of an openable capacity based on one graph of a power grid, and belongs to the field of power system dispatching automation.
Background
The power demand and the power structure are continuously changed due to the social and economic reformation development and the industrial structure adjustment, the social power demand is continuously improved, and the method for fully utilizing the residual power supply capacity of the power grid is paid more and more attention in consideration of the economic cost. When planning a current power distribution network, the maximum load of a user is not designed, and the electricity utilization and expansion requirements of the user are met through the principle of the openable capacity of equipment. The existing calculation mode of the openable capacity is simple, manual estimation and adjustment are mostly carried out by means of the experience of field workers, the existing grid structure and operation data of the current-level power grid and the upper-level power grid can be rarely utilized for analysis, the calculated openable capacity is conservative, subjectivity is high, accuracy is low, the influence of trend transfer is not considered, and the supporting and expanding effects of the grid structure and the operation mode on the openable capacity are not fully exerted.
Disclosure of Invention
The invention aims to provide a method for calculating the actual openable capacity based on one graph of a power grid, which aims to solve the technical problems that the conventional openable capacity calculation mode is simple, manual estimation and adjustment are mostly carried out by virtue of the experience of field workers, and the calculated openable capacity is high in subjectivity and low in accuracy.
In order to realize the purpose, the invention adopts the following technical scheme:
an openable capacity calculation method based on a power grid one-graph comprises the following steps:
obtaining the allowable current carrying capacity of the lines of the trunk lines of the distribution network, the annual historical maximum power utilization capacity of the lines and the power utilization capacity of the lines which are already copied and waiting to be accessed;
calculating the self-openable capacity of the distribution network trunk line according to the acquired allowable current carrying capacity of the line of the distribution network trunk line, the annual historical maximum power utilization capacity of the line and the power utilization capacity of the line which is repeatedly waiting to be accessed;
searching a superior power grid power supply path of a distribution network trunk line by using a graph calculation technology;
acquiring the rated capacity of a main transformer, the maximum load of the main transformer calendar history, the power consumption capacity of a line managed by the main transformer which is repeatedly accessed and the standby interval power consumption capacity of the main transformer on a power supply path of a superior power grid;
calculating the self-openable capacity of a main transformer on a power supply path of a superior power grid according to the acquired rated capacity of the main transformer, the maximum load of the main transformer calendar history, the repeated power consumption capacity to be accessed of the line governed by the main transformer and the standby interval power consumption capacity of the main transformer of the superior power grid;
calculating the actual openable capacity of the distribution network trunk line under different power supply paths according to the openable capacity of the distribution network trunk line and the openable capacity of a main transformer on a power supply path of a superior power grid in combination with the power supply path of the superior power grid;
and selecting the power supply path with the maximum openable capacity as the optimal power supply path, wherein the corresponding openable capacity is the final openable capacity of the trunk line of the distribution network.
Furthermore, the allowable current carrying capacity of the line of the main line of the distribution network, the annual historical maximum power utilization capacity of the line, the criticized and standby power utilization capacity of the line, the rated capacity of a main transformer, the maximum load of the main transformer calendar history, the criticized and standby power utilization capacity of the line managed by the main transformer and the standby and interval power utilization capacity of the main transformer on the power supply path of the superior power grid are obtained from a graph database of the regulation and control cloud power grid.
Further, the self-openable capacity of the distribution network trunk line is calculated by the following formula:
self-openable capacity beta of distribution network main line 2 X line allowable current carrying capacity-line annual history maximum power consumption capacity-line repeated standby power consumption capacity
Wherein, beta 2 As a coefficient, for the radiation path, determined according to the actual operating conditions of the installation, β 2 The value range is 0.8-0.9; and for the connection line, determining according to the operation mode and the actual operation condition of the equipment, and considering the N-1 principle and the mutual supply load characteristic, wherein the value range of beta is 0.5-0.9.
Further, the searching for the upper-level power supply path of the distribution network trunk line by using the technology of 'graph calculation' includes:
based on a graph database of a regulation cloud power grid, the power supply path is navigated by using a graph computing technology, a distribution network transformer with access requirements of users is used as a starting point, a main transformer with the maximum voltage level is used as a terminal point, and the main transformers along the power supply path are searched, so that the power supply path of a superior power grid is determined.
Further, the self-openable capacity of the main transformer is calculated by the following formula:
main transformer with its own open capacity being beta 1 Rated capacity of x main transformerMain transformer calendar history maximum load-main transformer administered line repetitious to access power consumption-main transformer spare interval power consumption
Wherein: beta is a 1 And determining the coefficient according to the operation mode and the actual condition of the transformer substation.
Further, the calculating the actual openable capacity of the distribution network trunk line under different power supply paths according to the openable capacity of the distribution network trunk line and the openable capacity of the main transformer on the power supply path of the superior power grid and by combining the power supply path of the superior power grid includes:
and comparing the self-openable capacity of the main trunk line of the distribution network on each power supply path with the self-openable capacity of the main transformers at each level according to the power supply paths of the superior power grid, and taking the minimum value of the openable capacity as the actual openable capacity of the main trunk line of the distribution network under the power supply path.
Further, the calculation of the self-openable capacity of the main transformer also follows the following calculation rules:
if the influence of management or the influence of the section is limited, the actual openable capacity of the main transformer is 0; if the calculated openable capacity of the main transformer is less than 1000 kilovolt-ampere, the actual openable capacity of the main transformer is 0; if the main transformer is not managed or the section influence is limited, and the calculated main transformer self openable capacity is more than or equal to 1000 kilovolt-ampere, the calculated main transformer self openable capacity is rounded downwards by taking 100 kilovolt-ampere as a unit.
Further, the calculation of the self-openable capacity of the distribution network trunk line also follows the following calculation rule:
if the actual openable capacity of a main transformer of a main line of the power distribution network is 0, the actual openable capacity of the main line is 0; if the open capacity of the main line of the power distribution network is less than 100 kilovolt-ampere, the actual open capacity of the main line of the power distribution network is 0; and if the actual openable capacity of the main transformer to which the main line of the power distribution network belongs is greater than or equal to 1000 kilovolt-ampere, and the calculated openable capacity of the main line of the power distribution network is greater than or equal to 100 kilovolt-ampere, rounding the calculated openable capacity of the main line of the power distribution network downwards by taking 50 kilovolt-ampere as a unit.
Compared with the prior art, the method for calculating the actual openable capacity based on the one-map power grid can calculate the openable capacity of the trunk line equipment of the one-map power distribution network based on the one-map power grid and the map database calculation mode, realize the calculation of the openable capacity from the distribution network trunk line to the superior high-voltage transmission network, provide an optimal power supply scheme, solve the problem that the existing openable capacity does not comprehensively consider the limitation of the integrated openable capacity analysis of the main distribution network, and improve the power supply capacity of the existing power supply network.
Drawings
FIG. 1 is a flow chart of the method of the present invention;
FIG. 2 is a process flow diagram of the present invention.
Detailed Description
The invention is further described with reference to specific examples. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
As described above, the existing openable capacity calculation method is simple, manual estimation and adjustment are mostly performed by means of experience of field workers, analysis can be rarely performed by using the existing grid structure and operation data of the current-level power grid and the upper-level power grid, the calculated openable capacity is conservative, subjectivity is high, accuracy is low, influence of power flow transfer is not considered, and supporting and expanding effects of the grid structure and the operation mode on the openable capacity are not fully exerted.
Therefore, the embodiment of the invention provides an openable capacity calculation method based on one power grid diagram. The method is based on a space-time data platform of 'power grid one-graph' constructed at present.
The grid-to-grid map is a grid topology map which is constructed by integrating grid topology structures and equipment data dispersed in a power dispatching production management system, an intelligent grid dispatching control system, an equipment (asset) operation and maintenance management system, a Geographic Information System (GIS) and other systems and takes equipment as nodes and equipment connection relations as edges, the grid topology connection relations are communicated up and down, the data of the grid equipment structure is realized, various measurement data collected by each system are longitudinally stored in a form facing to grid equipment and are transversely associated in a grid-to-map form, and therefore the time-space fusion sharing of multi-source data is realized, and the data of the grid equipment state is realized.
The equipment (asset) operation and maintenance management system provides ledger data and vector graphics of feeder lines, distribution transformers, branch lines and the like of a distribution network, and writes the ledger data and the vector graphics into a DSCADA database of the intelligent power grid dispatching control system for storage. The intelligent power grid dispatching control system interacts graph models, parameters and equipment measurement data of a main network and a distribution network with the model center regularly, and the model center performs work such as topology splicing (data of a production operation large area can be stored and displayed in a data management large area). The model center interacts the equipment ledger information with the power dispatching production management system, and establishes a table for storing relevant operation information such as equipment measurement in the regulation cloud independently, so that operation, distribution and dispatching data intercommunication and data sharing are realized.
As shown in fig. 1, in the method for calculating the open capacity based on one grid diagram according to the embodiment of the present invention, the open capacity calculation is performed based on a regulation cloud platform. The method comprises the following specific steps:
step 1, obtaining model data, historical operation data, allowable current-carrying capacity of equipment and the volume of power to be accessed when the line is recovered based on a graph database of a power grid one-graph of a regulation cloud.
And 2, calculating the self openable capacity of the 10 KV distribution network trunk line according to the data acquired in the step 1.
1) The calculation formula of the open capacity of the main line of the 10 kV power distribution network is as follows:
line open capacity β 2 X line allowed current carrying capacity-line annual history maximum power consumption capacity-line recovered power consumption capacity to be accessed (1)
Wherein:
β 2 is a coefficient: and for the radiation line, the value range of beta is determined according to the actual running condition of the equipment, and the value range of beta is 0.8-0.9. For the interconnection line, the method is determined according to the operation mode and the actual operation condition of the equipment, the N-1 principle and the mutual supply load characteristic are considered, and the value of beta is in a range0.5-0.9 of enclosure.
Line allowed current carrying capacity:
the maximum allowable current of the line should comprehensively consider the allowable current-carrying capacity of equipment such as a switch, a current transformer, an overhead line, a cable and the like, and also consider factors such as an environmental temperature correction coefficient, cable laying and the like.
The maximum power utilization capacity of the line year history: the historical maximum load 12 months prior to the day was counted.
The circuit is copied and the power consumption capacity to be accessed is as follows: the 10 kV power distribution network trunk line replies the power consumption capacity confirmed by the power supply scheme of the client, comprehensively considers the client application capacity, the total capacity of the power consumption equipment and the actual use condition, and combines the factors of production characteristics, the simultaneous utilization rate of the main power consumption equipment and the like.
2) The calculation rule of the actual open capacity of the trunk line of the 10 kV power distribution network is as follows:
if the actual openable capacity of a main transformer of a 10 kV power distribution network main line is 0, the actual openable capacity of the main line is 0; if the open capacity of a main line of a 10 kilovolt power distribution network is less than 100 kilovolt-ampere, the actual open capacity of the main line is 0; if the actual openable capacity of a main transformer belonging to a main line of a 10 kilovolt power distribution network is greater than or equal to 1000 kilovolt-ampere, the openable capacity calculated by the main line is greater than or equal to 100 kilovolt-ampere, and the openable capacity calculated according to the main line is rounded downwards by taking 50 kilovolt-ampere as a unit, for example, the openable capacity calculated by the main line is 165 kilovolt-ampere, and then the rounded openable capacity is 150 kilovolt-ampere.
And 3, based on the 'one-picture power grid' of the regulation cloud, realizing 'navigation' of a power supply path by using a 'picture' computing technology, searching main transformers of 110 kilovolt, 220 kilovolt or even 500 kilovolt power supply paths along the path by taking a distribution network transformer which is required to be accessed by a user as a starting point, and determining a superior power supply path of a 10 kilovolt power distribution network trunk line.
And 4, acquiring model data, historical operating data, rated capacity of the main transformer, the repeated standby access power utilization capacity of the line governed by the main transformer and the standby interval power utilization capacity of the main transformer on the power supply path of the upper-level power grid in the step 3 based on a graph database of the power grid of the regulation cloud.
And 5, calculating the self-openable capacity of the main transformer on the power supply path of the superior power grid according to the data acquired in the step 4.
1) The calculation formula of the openable capacity of the main transformer is as follows:
main transformer with its own open capacity being beta 1 X main transformer rated capacity-main transformer almanac history maximum load-main transformer administered line repeated waiting access used capacity-main transformer spare interval used capacity (2)
In the formula:
β 1 and determining the coefficient according to the operation mode and the actual condition of the transformer substation.
Main calendar history maximum load: the historical maximum load 12 months prior to the day was counted.
The method comprises the following steps that the main transformer governed line has been copied to wait for access to power utilization capacity: the sum of the power capacities of all the lines managed by the main transformer and the approved standby access.
Main transformer spare interval power consumption capacity: and a certain standby line governed by the main transformer finishes power utilization application and replication, and the sum of the replicated power utilization capacity of the line which is not formally accessed into the power grid and renamed is not obtained.
2) The actual openable capacity calculation rule of the main transformer is as follows:
if the influence of management or the influence of the section is limited, the actual openable capacity is 0; if the calculated openable capacity of the main transformer is less than 1000 kilovolt-ampere, the actual openable capacity of the main transformer is 0; if the main transformer is not managed or the section influence is limited, and the calculated openable capacity of the main transformer is greater than or equal to 1000 kilovolt-ampere, taking 100 kilovolt-ampere as a unit to perform downward rounding according to the calculated openable capacity of the main transformer, for example, the calculated openable capacity of the main transformer is 1150 kilovolt-ampere, and then the rounded value is 1100 kilovolt-ampere.
And 6, calculating the actual openable capacity of the distribution network trunk line under different power supply paths according to the openable capacity of the 10 kV distribution network trunk line and the openable capacity of a main transformer on a power supply path of a superior power grid and by combining the power supply path of the superior power grid.
The specific calculation method comprises the following steps: and comparing the self-openable capacity of the 10 kilovolt distribution network trunk line on each power supply path with the self-openable capacity of each main transformer according to the power supply paths of the superior power grid, and taking the minimum value of the openable capacity as the actual openable capacity of the distribution network trunk line under the power supply path.
Calculating the formula:
K＝min(S 0 ，S 1 ，S 2 ，...，S n ) (3)
wherein:
k: an openable capacity of a certain power supply path;
S 0 ，S 1 ，S 2 ，S n : the self-openable capacity of a 10 kilovolt distribution network main line, the self-openable capacity of a 1 st-level main transformer, the self-openable capacity of a 2 nd-level main transformer and the self-openable capacity of an nth-level main transformer are respectively shown.
And 7, selecting the power supply path with the maximum openable capacity as an optimal power supply path, wherein the corresponding openable capacity is the final openable capacity of the 10 kV distribution network trunk line.
The optimal power supply path open capacity calculation formula:
M＝max(K 1 ，K 2 ，...，K n ) (4)
wherein:
m: the optimal power supply path open capacity;
K 1 ，K 2 ，K n : the 1 st power supply path openable capacity, the 2 nd power supply path openable capacity, and the nth power supply path openable capacity are shown, respectively.
According to the embodiment, the method for calculating the openable capacity based on the one-graph power grid can calculate the openable capacity of the trunk line equipment of the distribution network of the one-graph power grid based on the one-graph power grid and graph database calculation mode, realize calculation of the openable capacity from the distribution network trunk line to the high-voltage transmission network, solve the problem that the existing openable capacity is not limited by comprehensive consideration of analysis of the integrated openable capacity of the main distribution network, and improve the power supply capacity of the existing power supply network.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The present invention has been disclosed in terms of the preferred embodiment, but is not intended to be limited to the embodiment, and all technical solutions obtained by substituting or converting equivalents thereof fall within the scope of the present invention.
Claims (8)
1. A calculation method of the openable capacity based on one graph of a power grid is characterized by comprising the following steps:
obtaining the allowable current carrying capacity of the lines of the trunk lines of the distribution network, the annual historical maximum power utilization capacity of the lines and the power utilization capacity of the lines which are already copied and waiting to be accessed;
calculating the self-openable capacity of the distribution network trunk line according to the acquired allowable current carrying capacity of the line of the distribution network trunk line, the annual historical maximum power utilization capacity of the line and the power utilization capacity of the line which is repeatedly waiting to be accessed;
searching a superior power grid power supply path of a distribution network trunk line by using a graph calculation technology;
acquiring the rated capacity of a main transformer, the maximum load of the main transformer calendar history, the repeated power consumption capacity to be accessed of the line governed by the main transformer and the standby interval power consumption capacity of the main transformer on the power supply path of a superior power grid;
calculating the self-openable capacity of a main transformer on a power supply path of a superior power grid according to the acquired rated capacity of the main transformer, the maximum load of the main transformer calendar history, the repeated power consumption capacity to be accessed of the line governed by the main transformer and the standby interval power consumption capacity of the main transformer of the superior power grid;
calculating the actual openable capacity of the main trunk line of the distribution network under different power supply paths by combining the power supply paths of the superior power grid according to the openable capacity of the main trunk line of the distribution network and the openable capacity of a main transformer on the power supply path of the superior power grid;
and selecting the power supply path with the maximum openable capacity as the optimal power supply path, wherein the corresponding openable capacity is the final openable capacity of the trunk line of the distribution network.
2. The method according to claim 1, wherein the allowable current carrying capacity of the line, the annual history maximum power utilization capacity of the line and the wholesale access power utilization capacity of the line of the main trunk of the distribution network, and the rated main transformer capacity, the annual history maximum load of the main transformer, the wholesale access power utilization capacity of the line managed by the main transformer and the spare interval power utilization capacity of the main transformer on the power supply path of the superior power grid are obtained from a graph database of the regulation cloud power grid.
3. The method of claim 1, wherein the self-opening capacity of the distribution network trunk line is calculated by the following formula:
self-openable capacity = beta of distribution network trunk line 2 The allowable current carrying capacity of the xX line, the annual historical maximum power utilization capacity of the line, and the power utilization capacity of the line which is to be accessed repeatedly;
wherein beta is 2 As a coefficient, for the radiation path, determined according to the actual operating conditions of the installation, β 2 The value range is 0.8-0.9; for the interconnection line, the operation mode and the actual operation condition of the equipment are determined, and the N-1 principle and the mutual supply load characteristic are considered, wherein beta is 2 The value range is 0.5-0.9.
4. The method of claim 1, wherein the searching for the upper level power supply path of the distribution network trunk line by using the graph computation technology comprises:
based on a graph database of a regulation cloud power grid, the power supply path is navigated by using a graph computing technology, a distribution network transformer with access requirements of users is used as a starting point, a main transformer with the maximum voltage level is used as a terminal point, and the main transformers along the power supply path are searched, so that the power supply path of a superior power grid is determined.
5. The method according to claim 1, wherein the self-openable capacity of the main transformer is calculated by the following formula:
self-openable capacity = beta of main transformer 1 X main transformer rated capacity-main transformer calendar history maximum load-main transformer administered line batch-repeated to-be-accessed power capacity-main transformer standby intervalA capacitance;
wherein: beta is a 1 And determining the coefficient according to the operation mode and the actual condition of the transformer substation.
6. The method of claim 1, wherein calculating the actual openable capacity of the distribution network trunk line under different power supply paths according to the self openable capacity of the distribution network trunk line, the self openable capacity of the main transformer on the power supply path of the upper level power grid and the power supply path of the upper level power grid, comprises:
and comparing the self-openable capacity of the main trunk line of the distribution network on each power supply path with the self-openable capacity of the main transformers at each level according to the power supply paths of the superior power grid, and taking the minimum value of the openable capacity as the actual openable capacity of the main trunk line of the distribution network under the power supply path.
7. The method according to claim 5, characterized in that the calculation of the own openable capacity of the main transformer further follows the following calculation rules:
if the influence of management or the influence of the section is limited, the actual openable capacity of the main transformer is 0; if the calculated openable capacity of the main transformer is less than 1000 kilovolt-ampere, the actual openable capacity of the main transformer is 0; if the main transformer is not managed or the section influence is limited, and the calculated main transformer self openable capacity is more than or equal to 1000 kilovolt-ampere, the calculated main transformer self openable capacity is rounded downwards by taking 100 kilovolt-ampere as a unit.
8. The method of claim 3, wherein the calculation of the self-openable capacity of the trunk line of the distribution network further follows the following calculation rules:
if the actual openable capacity of a main transformer of a main line of the power distribution network is 0, the actual openable capacity of the main line is 0; if the open capacity of the main line of the power distribution network is less than 100 kilovolt-ampere, the actual open capacity of the main line of the power distribution network is 0; and if the actual openable capacity of the main transformer to which the main line of the power distribution network belongs is greater than or equal to 1000 kilovolt-ampere, and the calculated openable capacity of the main line of the power distribution network is greater than or equal to 100 kilovolt-ampere, rounding the calculated openable capacity of the main line of the power distribution network downwards by taking 50 kilovolt-ampere as a unit.
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| CN108154255A (en) * | 2017-11-23 | 2018-06-12 | 国电南瑞科技股份有限公司 | A kind of implementation method of distribution network users access analysis system |
| CN108649569A (en) * | 2018-06-01 | 2018-10-12 | 国网江苏省电力有限公司 | Power distribution network based on the optimization of multi-joint network feeder switch can open capacity calculation methods |
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| CN107169880A (en) * | 2017-05-16 | 2017-09-15 | 国网山东省电力公司临清市供电公司 | Platform is monitored in power grid user electricity consumption on-line |
| CN108154255A (en) * | 2017-11-23 | 2018-06-12 | 国电南瑞科技股份有限公司 | A kind of implementation method of distribution network users access analysis system |
| CN108649569A (en) * | 2018-06-01 | 2018-10-12 | 国网江苏省电力有限公司 | Power distribution network based on the optimization of multi-joint network feeder switch can open capacity calculation methods |
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