CN112488393A - Medium-voltage distribution network construction project optimization method - Google Patents
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Abstract
The invention provides a medium-voltage distribution network construction project optimization method, and belongs to the technical field of distribution network construction. The method comprises the steps of obtaining a medium voltage distribution network project to be established; if the item is a necessary item, adding the item into the selected item library, otherwise, adding the item into an unnecessary item list; preferably sorting the optional item list; and selecting items from the sorted optional item list and adding the selected items into the selected item library according to the limitation of the investment amount. Wherein the method of preferred ordering comprises: predefining indexes for preferred sorting and weight values of the indexes; calculating the membership degree of the secondary index according to the secondary index and the weight value of the secondary index; acquiring project information of a single project, and calculating a decision value of the project; and after the decision values of all the items are calculated, sorting the items in the optional item list from large to small according to the decision values. The method can realize scientific management of power grid investment, improve the investment efficiency of the power distribution network, and improve the economic benefit and social benefit of a power grid company.
Description
Technical Field
The invention belongs to the technical field of power distribution network construction, and particularly relates to a medium-voltage power distribution network construction project optimization method.
Background
Electric power is one of the national basic industries, and the fundamental purpose of the investment and construction of electric power facilities is to meet the increasing power consumption requirements of the residential society and play a role in promoting and guiding the development of regional socioeconomic development to a certain extent. Therefore, the nature and the category of the power demand should be screened, and the reasonable power demand should be analyzed, so that the construction requirement of the power distribution network, which is beneficial to the sustainable development of the society and the economy, is determined.
The construction of the power distribution network is a comprehensive project, the decision is multi-attribute, and various factors such as the operation condition of the existing power grid, the demand of future social and economic development on electric power, the construction capability of the power grid, economic performance assessment and the like need to be considered; and because the decision-making criteria of different attributes are different, the problem of non-uniformity of the judgment criteria for solving the multi-attribute decision-making needs to be solved. For example, the evaluation of the operation condition of the power distribution network can be divided into aspects of safety, reliability, economy, adaptability, harmony and the like, so that when a power distribution network construction project is selected, evaluation indexes in different aspects need to be planned by a certain method.
The invention patent with publication number CN111967634A provides a comprehensive evaluation and optimization ranking method for investment projects of a power distribution network, which comprises the steps of obtaining constraint index conditions according to construction targets of the power distribution network, performing project optimization ranking based on the constraint indexes, and determining primary optimization projects; according to a pre-constructed power distribution network investment effect evaluation index system, performing optimization sequencing on the remaining items to be selected according to all evaluation indexes, and determining a second optimization item; and determining the standard reaching condition of the constraint index according to the primary preferred item and the secondary preferred item. The method screens the investment projects of the power distribution network twice, and can obtain an optimal project set which not only accords with the index promotion constraint of investment guidance, but also has higher investment benefits.
As another preferred sorting method for power distribution network projects proposed by patent publications CN110289616A and CN109934481A, in the method, the medium-voltage power distribution network projects all adopt a three-stage preferred sorting method, which includes: a first ranking based on project attribute priority, a second ranking based on project score and investment, and a third ranking based on project constraints.
At present, power distribution network construction projects comprise high-voltage power distribution network projects, medium-voltage power distribution network projects and the like, medium-voltage power distribution network project libraries are massive medium-low investment projects, the massive number of the projects is not suitable for adopting the multiple optimal sorting mode of the patent, and therefore a simple and easy mode is needed for scoring evaluation on a single medium-voltage power distribution network project.
Disclosure of Invention
The invention aims to solve the technical problem of providing a method for optimizing a construction project of a medium-voltage distribution network aiming at the defects of the prior art.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a medium voltage distribution network construction project optimization method, comprising:
s1, acquiring a medium voltage distribution network project to be established;
s2, if the item is the optional item, adding the item into the selected item library, otherwise, adding the item into the optional item list;
s3, carrying out preferred sorting on the optional item list;
s4, selecting items from the sorted optional item list according to the limitation of the investment amount and adding the selected items into the selected item library;
specifically, the preferred sorting method in step S3 includes:
s31, predefining indexes for optimal sorting and weight values of the indexes, wherein the indexes comprise primary indexes and secondary indexes;
s32, calculating the membership degree of the secondary index according to the secondary index and the weight value of the secondary index;
s33, traversing the optional item list to obtain the item information of a single item;
s34, calculating a decision value of the project according to the index, the weight value, the membership degree and the project investment amount;
and S35, after the decision values of all the items are calculated, sorting the items in the optional item list from large to small according to the decision values.
Further, the calculation method of the membership degree in step S32 is as follows:
s321, classifying the secondary indexes, wherein the classification comprises a positive index, an inverse index or a moderate index;
s322, calculating the membership degree of the secondary indexes according to the classification of the secondary indexes and the weight values of the secondary indexes.
Further, the calculation formula of the membership degree of the positive index is as follows:
q in the formula represents the weight value of the secondary index, SqRepresents the sum of the weight values of all secondary indexes under the primary index to which the secondary index belongs, L representsAnd calculating the membership degree.
Further, the calculation formula of the membership degree of the inverse index is as follows:
q in the formula represents the weight value of the secondary index, SqAnd L represents the sum of the weighted values of all the secondary indexes under the primary index to which the secondary index belongs, and the calculated membership degree.
Further, the membership degree calculation formula of the moderate index is as follows:
q in the formula represents the weight value of the secondary index, SqRepresents the total of the weight values of all secondary indexes under the primary index to which the secondary index belongs, a represents the minimum value of the moderate interval, b represents the maximum value of the moderate interval, and L represents the calculated membership degree.
Further, the decision value in step S34 is calculated as:
in the formula, m represents the number of primary indexes, n represents the number of secondary indexes subordinate to the calculated primary indexes, and VjAttribute value, Q, of the jth secondary index representing the item under evaluationiWeight value, L, representing the ith primary indicatorjAnd (4) representing the membership degree of the jth secondary index, I representing the investment amount of the project, and F representing the calculated decision value.
The high-voltage distribution network project has the characteristics that the investment amount of a single project is large, the total number of the projects is small, relatively accurate benefit data of the high-voltage distribution network project subjected to rigorous feasibility demonstration can be used as a reference basis for preference decision, and meanwhile, due to the fact that the number of the high-voltage projects is small, a complex model established by combining relevance among the projects can be considered for preference sequencing. The multi-stage double-Q preferred ordering method for the power distribution network planning project library, as proposed by the invention patent CN110689213A, is characterized in that a project relation matrix and project relation constraints are constructed; the power distribution network planning project multi-stage double-Q optimization [ J ] considering benefit coupling and time sequence correlation characteristics is optimized by using project correlation relations such as benefit coupling characteristics among projects when the power distribution network projects are planned, namely 2020,40(6):22-28.
However, the medium-voltage distribution network project library is a huge medium-low investment amount project, the investment requirement is more, the huge number of projects is not suitable for considering the incidence relation among the projects, and therefore, the medium-voltage distribution network project is subjected to scoring evaluation on a single project. When a single medium-voltage distribution network project is evaluated, a method for establishing a preferred model is adopted, such as documents (Licalendar waves, royal jade, royal kingding, and the like.) a planning state medium-voltage distribution network power supply reliability evaluation model [ J ]. a power system and an automation chemical report thereof, 2011,23(3):84-88.), documents (Zhou Xiao Ming Yi, Zhang Tong, Yanwei hong, and the like. medium-voltage distribution network project based on reliability marginal benefit is preferred [ J ]. power grid and clean energy, 2017,33(5):24-30.), and the like, the preferred values are respectively calculated for all projects by the method, and the project with the higher preferred value is the project which is most selected; there are also methods that use multiple preferential ordering, such as CN110289616A (a dynamic selection method for high-voltage distribution network project based on network analysis), CN109934481A (a project preferential ordering method in grid planning of distribution network), etc.
However, the optimal model needs to screen out a large amount of accurate data related to projects during calculation, but some small-scale projects cannot provide quantitative benefit data and cannot be brought into the optimal model for calculation; the method for sorting by multiple times of optimization is adopted, the sorting process is complicated, and especially when the number of projects is too large, a large amount of labor and time are consumed for multiple times of sorting.
The invention has the following beneficial effects:
the invention provides a preferable method suitable for a medium-voltage power distribution network construction project, the project can be evaluated only by specifying evaluation indexes and weighted values of the indexes, the data demand is small, and the calculation speed is high; the invention carries out quantitative evaluation according to the weighting improvement effect of a single project on the performance indexes, so that the expert can guide the declared projects of each city on the basis of the weight emphasis of each index.
Priority absolute guarantee projects can appear in projects declared in the prefecture, and the projects can be listed as necessary projects and selected in advance; for example, national policy oriented projects (such as new energy access), or local government required construction projects (such as yellow river beach area construction), or projects (power distribution and transmission of a high-voltage transformer substation) constrained by the construction conditions of a superior power grid can be listed as necessary projects and selected in advance; in this way, it is ensured that priority guarantee items must be selected.
The method can realize scientific management of power grid investment, can optimize the configuration of power grid resources to the greatest extent, distinguishes the investment of the power distribution network according to the type, the necessity and the urgency of the project, and provides decision support for reasonable definition of investment scale and ordered arrangement of planning projects.
The method can be applied to the investment management work of the power distribution network of the power grid company, ensures scientific and reasonable fund distribution, improves the investment efficiency of the power distribution network, and improves the economic benefit and the social benefit of the power grid company.
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The present invention will be described in further detail with reference to the accompanying drawings.
FIG. 1: flow chart of example 1 of the present invention.
FIG. 2: a flow chart of a preferred ranking method of the present invention.
Detailed Description
For a better understanding of the invention, the following description is given in conjunction with the examples and the accompanying drawings, but the invention is not limited to the examples. In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. It will be apparent, however, to one skilled in the art, that the present invention may be practiced without one or more of these specific details.
The purpose of this embodiment is to provide a method for optimizing a medium voltage distribution network construction project, as shown in fig. 1, the method includes:
1. and step S1, acquiring a medium voltage distribution network project to be established.
The medium voltage distribution network to be built comprises projects reported by various cities, projects determined by provincial companies, government-oriented projects and the like.
In the step, one project is selected from a project library of the medium voltage distribution network to be built, which consists of all projects to be built.
2. Step S2, if the item is a necessary item, adding the item to the selected item library, otherwise, adding the item to the unnecessary item list.
And judging the selected item, and if the item is a necessary item, adding the item into the selected item library. The optional items can be determined according to actual conditions, for example, important items for guaranteeing civil needs, important items for fulfilling social responsibility, items constructed by strong government leaders, items sent by a superior voltage distribution station and the like can be listed as optional items.
And if the selected item is not a necessary item, adding the item into an unnecessary item list, and continuously selecting the next item from the medium voltage distribution network item library to be established.
And after all the projects in the project library of the medium voltage distribution network are selected, continuing to execute the subsequent steps.
3. In step S3, the list of optional items is preferably sorted.
And analyzing the items in the optional item list according to the item indexes and the item data, and finally sequencing the items from high to low according to the priority degree.
4. And step S4, according to the investment quota, selecting items from the sorted optional item list in sequence and adding the selected items into the selected item library.
Because the annual investment amount is limited, the items are sequentially selected from the sorted optional item list, the total investment amount of all the selected items needs to be judged when one item is selected, and if the total investment amount does not exceed the investment limit, the selected item is added into the selected item library; if the total investment amount exceeds the investment limit, the selection is stopped and the selected item is discarded.
And after the selection is finished, the selected items in the item library are the optimized items to be established.
Specifically, as shown in fig. 2, the method for performing the preferred sorting on the optional item list in step S3 includes:
1) and step S31, predefining indexes for preferred sorting and weight values of the indexes, wherein the indexes comprise primary indexes and secondary indexes.
In this embodiment, referring to the concept of the analytic hierarchy process, the project preference index is set as a primary index and a secondary index. The first-level index is an index capable of improving the structure of a power grid, improving the equipment level and improving the power supply capacity, and can comprehensively reflect the investment effect of the power distribution network; the second-level index is a lower-level index refined from the first-level index.
In specific implementation, according to actual conditions, some indexes which are high in reliability, relatively convenient to obtain and easy to normalize are selected as evaluation standards, expert opinions are integrated, and the weight of each index is determined by using the Delphi method.
An example of a predefined metric and metric weight value is as follows:
2) and step S32, calculating the membership degree of the secondary index according to the secondary index and the weight value of the secondary index.
The relevant formula of the step is as follows:
q in the formula represents the weight value of the secondary index, SqRepresents the sum of the weight values of all secondary indicators (i.e. S) under the primary indicator to which the secondary indicator belongsqRepresenting the ratio of the secondary index weight value), and L represents the calculated membership.
According to the property of the secondary indexes, the indexes can be divided into three types of positive indexes, inverse indexes and moderate indexes.
The positive index is the index with the larger numerical value, the better, and the membership degree of the positive index can be calculated by adopting a formula (1); the inverse index is the index with a smaller numerical value and a better numerical value, and the membership degree of the inverse index can be calculated by adopting a formula (2).
The moderate index is the best index when the numerical value is within a certain range (moderate interval), the development of the power grid is not facilitated when the numerical value is too large or too small, and the calculation of the membership degree of the moderate index can be realized by adopting a formula (3). Equation (3) is a trapezoidal distribution function, where a represents the minimum value of the moderate interval and b represents the maximum value of the moderate interval.
If the predefined weight value is not within +/-1, the method of the step can normalize the weight value to be within +/-1, and lays a foundation for subsequent calculation.
For the predefined index and weight value in step S32 in this embodiment, the result of the membership degree of the secondary index calculated in this step is as follows:
3) and step S33, traversing the optional item list to obtain the item information of the single item.
Selecting a single item from an optional item list, and acquiring item information of the item; the project information includes attribute information on reliability, economy, external influence, and the like of the project.
4) And step S34, calculating a decision value of the project according to the weight value of the primary index, the membership degree of the secondary index, the attribute value of the secondary index and the project investment amount.
The relevant formula of the step is as follows:
m in the formula (4) represents the number of the first-level indexes, and the value of m is 3 in the embodiment; n represents the number of the calculated secondary indexes subordinate to the primary index; vjAttribute value, Q, of the jth secondary index representing the item under evaluationiWeight value, L, representing the ith primary indicatorjRepresenting the degree of membership of the jth secondary index. I denotes the investment amount of the project and F denotes the calculated decision value.
The decision value F calculated in the step is actually an improvement value of unit investment on the evaluation value, and can represent the effect which can be obtained by unit investment.
An example of decision value calculation is as follows:
the project reported in 2019 of a certain city, namely, the project from 110 kV x to 10 kV 9 and the project from 10 lines to x, is taken as an example, and the investment amount of the project is 210.13 ten thousand yuan.
The attribute values of the project secondary indexes are as follows:
the calculation is made according to equation (4):
E＝55×0.5×36.8+55×0.3×68.0+…+10×0.2×73.9＝3512.7
part of the contents in the listed calculation formula are omitted, and the decision value of the item is calculated to be 16.72.
5) And step S35, after the decision values of all the items are calculated, sorting the items in the optional item list from large to small according to the decision values.
And after the decision values of all the items are calculated, sorting the items in the optional item list according to the decision values of the items and the sequence from large to small.
In the sorted optional item list, the items with the priority selection are closer to the top of the list.
It should be noted that the reference numbers of the steps related to the present invention do not indicate the execution sequence, and those skilled in the art may change the sequence of the steps without departing from the protection scope of the present invention.
Finally, the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting, and other modifications or equivalent substitutions made by the technical solutions of the present invention by those of ordinary skill in the art should be covered within the scope of the claims of the present invention as long as they do not depart from the spirit and scope of the technical solutions of the present invention.
Claims (6)
1. A construction project optimization method for a medium-voltage distribution network is characterized by comprising the following steps: the method comprises the following steps:
s1, acquiring a medium voltage distribution network project to be established;
s2, if the item is the optional item, adding the item into the selected item library, otherwise, adding the item into the optional item list;
s3, carrying out preferred sorting on the optional item list;
s4, selecting items from the sorted optional item list according to the limitation of the investment amount and adding the selected items into the selected item library;
specifically, the preferred sorting method in step S3 includes:
s31, predefining indexes for optimal sorting and weight values of the indexes, wherein the indexes comprise primary indexes and secondary indexes;
s32, calculating the membership degree of the secondary index according to the secondary index and the weight value of the secondary index;
s33, traversing the optional item list to obtain the item information of a single item;
s34, calculating a decision value of the project according to the weight value of the primary index, the membership degree of the secondary index, the attribute value of the secondary index and the project investment amount;
and S35, after the decision values of all the items are calculated, sorting the items in the optional item list from large to small according to the decision values.
2. The method for optimizing a construction project of a medium voltage distribution network according to claim 1, characterized in that: the calculation method of the membership degree in step S32 is:
s321, classifying the secondary indexes, wherein the classification comprises a positive index, a reverse index or a moderate index;
s322, calculating the membership degree of the secondary indexes according to the classification of the secondary indexes and the weight values of the secondary indexes.
3. The method for optimizing a construction project of a medium voltage distribution network according to claim 2, characterized in that: the calculation formula of the membership degree of the positive index is as follows:
q in the formula represents the weight value of the secondary index, SqAnd L represents the sum of the weighted values of all the secondary indexes under the primary index to which the secondary index belongs, and the calculated membership degree.
4. The method for optimizing a construction project of a medium voltage distribution network according to claim 2, characterized in that: the calculation formula of the membership degree of the inverse index is as follows:
q in the formula represents the weight value of the secondary index, SqAnd L represents the sum of the weighted values of all the secondary indexes under the primary index to which the secondary index belongs, and the calculated membership degree.
5. The method for optimizing a construction project of a medium voltage distribution network according to claim 2, characterized in that: the membership degree calculation formula of the moderate index is as follows:
q in the formula represents the weight value of the secondary index, SqRepresents the total of the weight values of all secondary indexes under the primary index to which the secondary index belongs, a represents the minimum value of the moderate interval, b represents the maximum value of the moderate interval, and L represents the calculated membership degree.
6. The method for optimizing a construction project of a medium voltage distribution network according to claim 1, characterized in that: the calculation formula of the decision value in step S34 is:
in the formula, m represents the number of primary indexes, n represents the number of secondary indexes subordinate to the calculated primary indexes, and VjAttribute value, Q, of the jth secondary index representing the item under evaluationiWeight value, L, representing the ith primary indicatorjAnd (4) representing the membership degree of the jth secondary index, I representing the investment amount of the project, and F representing the calculated decision value.
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