CN115345524B - Method and device for constructing energy efficiency evaluation system of distribution transformer - Google Patents
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Abstract
The invention discloses a method and a device for constructing an energy efficiency evaluation system of a distribution transformer, which are used for acquiring evaluation indexes of multiple energy efficiency evaluations based on energy consumption analysis of the distribution transformer; classifying all the evaluation indexes into qualitative indexes and quantitative indexes, quantitatively preprocessing the qualitative indexes, and giving a weight initial value to each evaluation index; determining relative coefficients among the evaluation indexes, and adjusting the weight initial value of each evaluation index to obtain the weight value of each evaluation index; and (5) associating the evaluation indexes and the corresponding weight values, and constructing and obtaining a distribution transformer energy efficiency evaluation system. According to the invention, through analyzing the relevance of the energy consumption, the basic attribute parameters such as the distribution transformer material, design and the like and the operation parameters, the evaluation index and the corresponding weight affecting the energy efficiency of the distribution transformer are determined fundamentally, so that an accurate energy efficiency evaluation system is constructed, and the power grid optimizing operation and the distribution transformer industry optimizing upgrading are assisted.
Description
Technical Field
The invention relates to the technical field of intelligent power grids, in particular to a method and a device for constructing a distribution transformer energy efficiency evaluation system.
Background
The loss of the distribution transformer serving as the core equipment of the power grid accounts for 40-50% of the loss of the power transmission and distribution power, and the demand of the market for high-efficiency transformers is continuously increasing. In the power industry, national standards such as "energy efficiency limit value and energy efficiency class of power transformers" are continuously put forward, and the idle load and load loss of currently used distribution transformers are reduced in a standardized manner.
The energy-saving distribution transformer energy efficiency evaluation method has the advantages that the energy-saving distribution transformer is actively improved and guided to be connected to the network, meanwhile, the indexes of the energy efficiency of the distribution transformer are required to be evaluated and analyzed, the influence of relevant parameters on the energy efficiency of the distribution transformer is sought to be clarified, and a reference is provided for the industrial upgrading of the follow-up distribution transformer. Typical systems or devices are analyzed at home and abroad, an analysis model is established, and related schemes for improving the energy efficiency of the systems or the devices are provided through simulation of model software.
As disclosed in patent CN107122881a, a comprehensive energy efficiency evaluation system based on a distribution area, the system comprising: the comprehensive energy efficiency index module comprises a plurality of index units and an adder; the adder respectively carries out multiple sequential logic judgment on the qualification rate of each index unit in real time according to the arrangement mode of the arithmetic progression, and each logic judgment carries out addition according to the number of the counts so as to obtain the score of each index unit; the index weight calculation module is used for obtaining weight values of all index units; and the comprehensive energy efficiency evaluation module is used for calculating the comprehensive energy efficiency of the power distribution station area according to the score of each index unit and the weight value corresponding to the score. The scheme can realize parallel acquisition and real-time processing of various data of the power distribution area, realizes comprehensive evaluation of comprehensive energy efficiency of the power distribution area, and has the advantages of simple evaluation steps, low cost and visual and reliable result.
For example, patent CN114943463a provides a method for evaluating energy saving technology of a power distribution network, which comprises constructing an evaluation index system including a target layer, a criterion layer and an index layer, constructing a three-level index evaluation system from 4 dimensions of grid structure, grid energy efficiency, grid economy and environmental benefit of the grid, and combining the actual situation of energy saving measures in the grid to obtain the influence of different energy saving technology measures on energy saving benefits in different dimensions.
The evaluation scheme provided by the scheme solves the problems of complicated process and steps in the prior art, but the constructed evaluation system is still not perfect enough, and the degree of refinement and accuracy is still obviously insufficient. The energy efficiency of the power distribution network area is evaluated, and the energy efficiency evaluation method is not applicable to energy efficiency evaluation of the power distribution transformer.
Therefore, how to construct a distribution transformer energy efficiency evaluation system to realize accurate evaluation of the energy efficiency of the distribution transformer, and optimizing and upgrading the power-assisted distribution transformer industry are problems to be solved by those skilled in the art.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a method and a device for constructing an energy efficiency evaluation system of a distribution transformer, which are used for determining an energy efficiency evaluation index from a root by analyzing the relation between energy consumption and basic attribute parameters such as distribution transformer materials, designs and the like and operation parameters, solving a weight value of each energy efficiency evaluation index, associating the evaluation index with the corresponding weight value, and constructing the accurate energy efficiency evaluation system. The energy efficiency evaluation system is constructed by considering the relative relation between the energy efficiency tracing and evaluation indexes of the distribution transformer, and the industrial optimization and upgrading of the power-assisted distribution transformer can provide support for the optimization method related to the main materials, the process foundation and the operation control of the distribution transformer.
In a first aspect, the present invention provides a method for constructing a distribution transformer energy efficiency evaluation system, comprising the steps of:
acquiring evaluation indexes of multiple energy efficiency evaluations based on energy consumption analysis of the distribution transformer;
classifying all the evaluation indexes into qualitative indexes and quantitative indexes, quantitatively preprocessing the qualitative indexes, and giving a weight initial value to each evaluation index;
determining relative coefficients among the evaluation indexes, and adjusting the weight initial value of each evaluation index to obtain the weight value of each evaluation index;
and (5) associating the evaluation indexes and the corresponding weight values, and constructing and obtaining a distribution transformer energy efficiency evaluation system.
Further, based on the energy consumption analysis of the distribution transformer, the evaluation indexes of a plurality of energy efficiency evaluations are obtained, and the method specifically comprises the following steps:
the relation between the power loss of the distribution transformer and the influence parameters is obtained, and the relation is specifically expressed as follows:
wherein W is the power loss of the distribution transformer, L 1 For no-load loss of distribution transformer, L 2 For short-circuit loss of distribution transformer, I 1 % is the percentage of the no-load current of the distribution transformer, u 2 % is the rated short-circuit impedance voltage percentage of the distribution transformer, K Q E is the annual total power transmission quantity of the distribution transformer for reactive economic equivalent,is the annual average power coefficient of the distribution transformer, S e For rated capacity of distribution transformer, t max The annual maximum load loss time of the distribution transformer is t, and the annual input operation time of the distribution transformer is t;
providing basic attribute parameters and operation parameters of the distribution transformer related to the influence parameters;
and decomposing basic attribute parameters and operation parameters of the distribution transformer to obtain evaluation indexes of multiple energy efficiency evaluations.
Further, the pretreatment for quantifying qualitative indexes specifically includes:
performing assignment processing on each qualitative indicator to obtain a first numerical value of each qualitative indicator;
based on the first numerical value of the qualitative index and the type of the qualitative index, carrying out averaging treatment on the first numerical value to obtain data after qualitative index pretreatment;
wherein, carry out the assignment processing to each qualitative index, specifically include: collecting the text comments of each qualitative index, giving a value vector, combining the text comments and the value vector to obtain a first numerical value of each qualitative index, wherein the first numerical value is expressed as, wherein ,Di Text, which is the first value of the ith qualitative rating i And j is the number of the character comments of the qualitative index.
Further, based on the first value of the qualitative indicator and the type of the qualitative indicator, the method comprises the following steps of:
determining the type of the qualitative index according to the change trend of the influence on the energy efficiency, and defining the type as a first type and a second type respectively, wherein the first type is positively correlated with the influence on the energy efficiency, and the second type is negatively correlated with the influence on the energy efficiency;
the first numerical processing formula for the first type is:；
the first numerical processing formula for the second type is:；
wherein ,for the first value of the ith qualitative rating after the averaging process,for the limit maximum in the first value of the ith qualitative rating,for the limit minimum in the first value of the ith qualitative rating,the reference value of the first value is the i-th qualitative indicator.
Further, the step of giving each evaluation index a weight initial value specifically includes:
calculating the entropy value corresponding to each evaluation index based on the characteristic proportion of each evaluation index in all the evaluation indexes;
obtaining a corresponding difference coefficient according to the entropy value of each evaluation index;
and calculating the initial weight value of each evaluation index through the difference coefficient.
Further, according to the entropy value of each evaluation index, a corresponding difference coefficient is obtained, and the calculation formula is as follows:
wherein ,as the difference coefficient of the i-th evaluation index,the value of the ith evaluation index after quantitative pretreatment;
the weight initial value of each evaluation index is calculated through the difference coefficient, and the calculation formula is as follows:
wherein ,the weight initial value of the i-th evaluation index.
Further, determining a relative coefficient between the evaluation indexes, and adjusting a weight initial value of each evaluation index to obtain a weight value of each evaluation index, which specifically comprises:
sequencing all the evaluation indexes according to the importance degree to obtain an evaluation index sequence;
obtaining a weight relative value of each evaluation index based on the weight ratio of adjacent evaluation indexes in the evaluation index sequence;
and according to the initial weight value and the relative weight value of the evaluation indexes, combining the scale coefficients to give the weight value of each evaluation index.
Further, based on the weight ratio of adjacent evaluation indexes in the evaluation index sequence, the weight relative value of each evaluation index is obtained, and the specific formula is as follows:
wherein ,the weight relative value of the ith evaluation index, k is the number of the evaluation indexes,the value of the ith evaluation index after quantitative pretreatment;
according to the initial weight value and the relative weight value of the evaluation index, the weight value of each evaluation index is given by combining the proportional coefficient, and the calculation formula is as follows:
wherein ,the weight value of the i-th evaluation index,is the proportionality coefficient of the ith evaluation index,the weight initial value of the i-th evaluation index.
Further, the related evaluation indexes and the corresponding weight values are constructed to obtain a distribution transformer energy efficiency evaluation system, which specifically comprises the following steps:
determining an evaluation index matrix of the distribution transformer, wherein the evaluation index matrix is expressed as:, wherein ,pi The i-th evaluation index is the number of the evaluation indexes, and k is the number of the evaluation indexes;
acquiring a weight matrix comprising weight values of each evaluation index, wherein the weight matrix is expressed as:,
wherein ,the weight value of the ith evaluation index is k, and the number of the evaluation indexes is k;
and (5) collecting the evaluation index matrix and the weight matrix, and constructing and obtaining a distribution transformer energy efficiency evaluation system.
In a second aspect, the present invention also provides an apparatus for constructing an energy efficiency evaluation system of a distribution transformer, and the method for constructing the energy efficiency evaluation system of the distribution transformer by adopting the above method, including:
the energy consumption analysis module is used for carrying out energy consumption analysis on the distribution transformer, obtaining a plurality of evaluation indexes of energy efficiency evaluation, classifying all the evaluation indexes into qualitative indexes and quantitative indexes;
the data processing module is used for quantitatively preprocessing the qualitative indexes, endowing each evaluation index with a weight initial value, determining the relative coefficient among the evaluation indexes, and adjusting the weight initial value of each evaluation index to obtain the weight value of each evaluation index;
and the evaluation system construction module is used for associating the evaluation indexes and the corresponding weight values and constructing and obtaining the energy efficiency evaluation system of the distribution transformer.
The invention provides a method and a device for constructing a distribution transformer energy efficiency evaluation system, which at least comprise the following beneficial effects:
(1) By analyzing the relation between the energy consumption and basic attribute parameters such as the materials, design and the like of the distribution transformer and the operation parameters, the evaluation index of the energy efficiency of the distribution transformer can be determined from the root. The accuracy of energy efficiency evaluation of the distribution transformer is improved, meanwhile, support is provided for optimization of main materials, process basis and operation control of the follow-up distribution transformer, and scientific basis is provided.
(2) The qualitative indexes are subjected to assignment treatment and equalization treatment, so that the objectivity and rationality of a subsequently constructed index evaluation system can be effectively ensured.
(3) The weight of each evaluation index is determined by processing the initial weight value, the relative coefficient, the relative weight value and the like, so that the integrity of an index evaluation system is considered, the interaction among the evaluation indexes is considered, the comprehensive evaluation of the energy efficiency of the distribution transformer can be realized more accurately and objectively, and the scientificity of the network access decision of the distribution transformer is improved.
Drawings
FIG. 1 is a schematic flow chart of a method for constructing a distribution transformer energy efficiency evaluation system provided by the invention;
FIG. 2 is a schematic flow chart of a pretreatment for quantifying qualitative indicators according to an embodiment of the present invention;
FIG. 3 is a flowchart of assigning an initial value to each evaluation index according to an embodiment of the present invention;
fig. 4 is a schematic diagram of an apparatus for constructing an energy efficiency evaluation system of a distribution transformer according to the present invention.
Detailed Description
In order to better understand the above technical solutions, the following detailed description will be given with reference to the accompanying drawings and specific embodiments. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in this application and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise, the "plurality" generally includes at least two.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a product or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such product or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a commodity or device comprising such element.
In order to finish upgrading and reforming of the high-energy-consumption distribution transformer, the quality of equipment of the novel energy-saving distribution transformer needs to be evaluated in advance to form intelligent result information, an optimal design method is fed back, and the power grid is assisted in optimizing operation and optimizing and upgrading of the transformer industry.
The energy efficiency of a distribution transformer refers to the efficiency with which electrical energy is transmitted, converted, and utilized in the distribution transformer, and is a factor of significant economy, technology, and benefit in power grid operation considerations. The energy efficiency evaluation of the distribution transformer is carried out, and a reasonable, accurate and effective energy efficiency evaluation index system is firstly required to be built.
As shown in fig. 1, the invention provides a method for constructing a distribution transformer energy efficiency evaluation system, which comprises the following steps:
acquiring evaluation indexes of multiple energy efficiency evaluations based on energy consumption analysis of the distribution transformer;
classifying all the evaluation indexes into qualitative indexes and quantitative indexes, quantitatively preprocessing the qualitative indexes, and giving a weight initial value to each evaluation index;
determining relative coefficients among the evaluation indexes, and adjusting the weight initial value of each evaluation index to obtain the weight value of each evaluation index;
and (5) associating the evaluation indexes and the corresponding weight values, and constructing and obtaining a distribution transformer energy efficiency evaluation system.
Through the energy consumption analysis of the distribution transformer, the evaluation index of energy efficiency evaluation is obtained from the root, so that the energy efficiency evaluation system of the distribution transformer is constructed more accurately and clearly, and the support can be provided for the main materials, the process foundation and the operation control optimization method of the distribution transformer.
Based on energy consumption analysis of the distribution transformer, the method acquires evaluation indexes of multiple energy efficiency evaluations, and specifically comprises the following steps:
the relation between the power loss of the distribution transformer and the influence parameters is obtained, and the relation is specifically expressed as follows:
wherein W is the power loss of the distribution transformer, L 1 For no-load loss of distribution transformer, L 2 For short-circuit loss of distribution transformer, I 1 % is the percentage of the no-load current of the distribution transformer, u 2 % is the rated short-circuit impedance voltage percentage of the distribution transformer, K Q E is the annual total power transmission quantity of the distribution transformer for reactive economic equivalent,is the annual average power coefficient of the distribution transformer, S e For rated capacity of distribution transformer, t max The annual maximum load loss time of the distribution transformer is t, and the annual input operation time of the distribution transformer is t;
providing basic attribute parameters and operation parameters of the distribution transformer related to the influence parameters;
and decomposing basic attribute parameters and operation parameters of the distribution transformer to obtain evaluation indexes of multiple energy efficiency evaluations.
Distribution transformers are mainly divided into a three-dimensional coiled core transformer and a traditional laminated core transformer. The main traditional lamination type core transformer used in the current power system industry is also a three-dimensional winding core transformer, however, the three-dimensional winding core transformer is different from a planar core structure, is structurally modified, has small no-load loss, improves structural strength and short circuit resistance, is more in line with the high energy efficiency in theory, and is also a trend of development of the power industry. However, optimization iterations of the industry need to consider losses of the distribution transformer from various aspects, and thus can be categorized into two major categories, namely, the basic attribute parameters of the distribution transformer and the operational parameters of the distribution transformer.
The basic attribute parameters of the distribution transformer comprise the delivery energy efficiency of the distribution transformer, the no-load loss of the distribution transformer, the no-load current of the distribution transformer and the like. The energy efficiency of the distribution transformer comprises the material and the specific gravity of the material of the distribution transformer, and the material can be amorphous alloy, S11 and the like. The no-load loss of the distribution transformer is fixed loss, and relates to the type of iron core, the material of the iron core and the like. The load loss of the distribution transformer is variable loss, mainly copper loss, and relates to the material of cables. The no-load current of the distribution transformer also relates to the iron core, and the iron core structure and the power conversion mode related to the iron core are included.
Distribution transformer operating parameters include power factor of the distribution transformer, imbalance ratio of the three phases, load factor, etc.
Of course, the above is a limited list of basic attribute parameters and operating parameters of the distribution transformer, and is not exhaustive. The specific categories and numbers of basic attribute parameters and operating parameters of the distribution transformers involved in the evaluation of each application scenario or different types of distribution transformers will vary, and are not specifically limited herein.
As shown in fig. 2, the pretreatment for quantifying the qualitative index specifically includes:
performing assignment processing on each qualitative indicator to obtain a first numerical value of each qualitative indicator;
based on the first numerical value of the qualitative index and the type of the qualitative index, carrying out averaging treatment on the first numerical value to obtain data after qualitative index pretreatment;
wherein, carry out the assignment processing to each qualitative index, specifically include: collecting the text comments of each qualitative index, giving a value vector, combining the text comments and the value vector to obtain a first numerical value of each qualitative index, wherein the first numerical value is expressed as, wherein ,Di Text, which is the first value of the ith qualitative rating i And j is the number of the character comments of the qualitative index.
Wherein, based on the first numerical value of the qualitative index and the type of the qualitative index, the first numerical value is subjected to the averaging process, which specifically comprises:
determining the type of the qualitative index according to the change trend of the influence on the energy efficiency, and defining the type as a first type and a second type respectively, wherein the first type is positively correlated with the influence on the energy efficiency, and the second type is negatively correlated with the influence on the energy efficiency;
the first numerical processing formula for the first type is:；
the first numerical processing formula for the second type is:；
wherein ,for the first value of the ith qualitative rating after the averaging process,for the limit maximum in the first value of the ith qualitative rating,for the limit minimum in the first value of the ith qualitative rating,the reference value of the first value is the i-th qualitative indicator.
The types of qualitative indicators can be broadly divided into two categories, the first type being positively correlated with the energy efficiency impact, that is, a larger first value of the first type of qualitative indicator indicates a greater benefit; conversely, the second type is inversely related to the energy efficiency impact, that is, the smaller the first value of the qualitative rating of the second type is, the more beneficial.
As shown in fig. 3, the method for giving the initial weight to each evaluation index specifically includes:
calculating the entropy value corresponding to each evaluation index based on the characteristic proportion of each evaluation index in all the evaluation indexes;
obtaining a corresponding difference coefficient according to the entropy value of each evaluation index;
and calculating the initial weight value of each evaluation index through the difference coefficient.
Further, according to the entropy value of each evaluation index, a corresponding difference coefficient is obtained, and the calculation formula is as follows:
wherein ,as the difference coefficient of the i-th evaluation index,for the value of the ith evaluation index after the quantitative pretreatment,representing the characteristic specific gravity of the ith evaluation index among all the evaluation indexes,representing the entropy value corresponding to the ith evaluation index.
The weight initial value of each evaluation index is calculated through the difference coefficient, and the calculation formula is as follows:
wherein ,the weight initial value of the i-th evaluation index.
Further, determining a relative coefficient between the evaluation indexes, and adjusting a weight initial value of each evaluation index to obtain a weight value of each evaluation index, which specifically comprises:
sequencing all the evaluation indexes according to the importance degree to obtain an evaluation index sequence;
obtaining a weight relative value of each evaluation index based on the weight ratio of adjacent evaluation indexes in the evaluation index sequence;
and according to the initial weight value and the relative weight value of the evaluation indexes, combining the scale coefficients to give the weight value of each evaluation index.
Further, based on the weight ratio of adjacent evaluation indexes in the evaluation index sequence, the weight relative value of each evaluation index is obtained, and the specific formula is as follows:
wherein ,the weight relative value of the ith evaluation index, k is the number of the evaluation indexes,the value of the ith evaluation index after quantitative pretreatment;
according to the initial weight value and the relative weight value of the evaluation index, the weight value of each evaluation index is given by combining the proportional coefficient, and the calculation formula is as follows:
wherein ,the weight value of the i-th evaluation index,is the proportionality coefficient of the ith evaluation index,the weight initial value of the i-th evaluation index.
The weight of the evaluation index takes into account both the initial weight value (objective condition of the first value of the evaluation index) and the relative weight value (relative relation between the correlations of the evaluation index), and thus sets the corresponding scaling factor, thereby giving a more accurate final weight value. Of course, the scaling factor may be adjusted according to different application scenarios or different types of distribution transformers, and specific determined values are not limited herein.
The weight of each evaluation index is determined by processing the initial weight value, the relative coefficient, the relative weight value and the like, so that the integrity of an index evaluation system is considered, the interaction among the evaluation indexes is considered, and the comprehensive evaluation of the energy efficiency of the distribution transformer can be realized more accurately and objectively.
Further, the related evaluation indexes and the corresponding weight values are constructed to obtain a distribution transformer energy efficiency evaluation system, which specifically comprises the following steps:
determining an evaluation index matrix of the distribution transformer, wherein the evaluation index matrix is expressed as:, wherein ,pi The i-th evaluation index is the number of the evaluation indexes, and k is the number of the evaluation indexes;
acquiring a weight matrix comprising weight values of each evaluation index, wherein the weight matrix is expressed as:,
wherein ,the weight value of the ith evaluation index is k, and the number of the evaluation indexes is k;
and (5) collecting the evaluation index matrix and the weight matrix, and constructing and obtaining a distribution transformer energy efficiency evaluation system.
The weight values corresponding to the evaluation indexes are different, and the energy efficiency evaluation system of the distribution transformer is built by integrating the evaluation index matrix and the weight matrix.
According to the method for constructing the energy efficiency evaluation system of the distribution transformer, provided by the embodiment, the evaluation index of the energy efficiency of the distribution transformer can be determined fundamentally by analyzing the relation between the energy consumption and the basic attribute parameters such as the material, design and the like of the distribution transformer and the operation parameters. The accuracy of energy efficiency evaluation is improved, and meanwhile, support is provided for optimization of main materials, process foundations and operation control of the follow-up distribution transformer.
As shown in fig. 4, the present invention further provides a device for constructing a power efficiency evaluation system of a distribution transformer, and the method for constructing the power efficiency evaluation system of the distribution transformer by adopting the above method comprises:
the energy consumption analysis module is used for carrying out energy consumption analysis on the distribution transformer, obtaining a plurality of evaluation indexes of energy efficiency evaluation, classifying all the evaluation indexes into qualitative indexes and quantitative indexes;
the data processing module is used for quantitatively preprocessing the qualitative indexes, endowing each evaluation index with a weight initial value, determining the relative coefficient among the evaluation indexes, and adjusting the weight initial value of each evaluation index to obtain the weight value of each evaluation index;
and the evaluation system construction module is used for associating the evaluation indexes and the corresponding weight values and constructing and obtaining the energy efficiency evaluation system of the distribution transformer.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the invention. It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (2)
1. The method for constructing the energy efficiency evaluation system of the distribution transformer is characterized by comprising the following steps of:
the relation between the power loss of the distribution transformer and the influence parameters is obtained, and the relation is specifically expressed as follows:
；
wherein W is the power loss of the distribution transformer, L 1 For no-load loss of distribution transformer, L 2 For short-circuit loss of distribution transformer, I 1 % is the percentage of the no-load current of the distribution transformer, u 2 % is the rated short-circuit impedance of the distribution transformerPercentage of voltage, K Q E is the annual total power transmission quantity of the distribution transformer for reactive economic equivalent,is the annual average power coefficient of the distribution transformer, S e For rated capacity of distribution transformer, t max The annual maximum load loss time of the distribution transformer is t, and the annual input operation time of the distribution transformer is t;
providing basic attribute parameters and operation parameters of the distribution transformer related to the influence parameters, wherein the basic attribute parameters of the distribution transformer comprise the delivery energy efficiency of the distribution transformer, the no-load loss of the distribution transformer, the load loss of the distribution transformer and the no-load current of the distribution transformer, and the operation parameters of the distribution transformer comprise the power factor, the unbalance rate of three phases and the load factor of the distribution transformer;
decomposing basic attribute parameters and operation parameters of the distribution transformer to obtain evaluation indexes of multiple energy efficiency evaluations;
classifying all the evaluation indexes into qualitative indexes and quantitative indexes, quantitatively preprocessing the qualitative indexes, and giving a weight initial value to each evaluation index;
sequencing all the evaluation indexes according to the importance degree to obtain an evaluation index sequence;
based on the weight ratio of adjacent evaluation indexes in the evaluation index sequence, the weight relative value of each evaluation index is obtained, and the specific formula is as follows:
；
wherein ,the weight relative value of the ith evaluation index, k is the number of the evaluation indexes, and +.>The value of the ith evaluation index after quantitative pretreatment;
according to the initial weight value and the relative weight value of the evaluation index, the weight value of each evaluation index is given by combining the proportional coefficient, and the calculation formula is as follows:
；
wherein ,weight value for the ith evaluation index, +.>Scale factor for the ith evaluation index, +.>The weight initial value of the ith evaluation index;
determining an evaluation index matrix of the distribution transformer, wherein the evaluation index matrix is expressed as:, wherein ,pi The i-th evaluation index is the number of the evaluation indexes, and k is the number of the evaluation indexes;
acquiring a weight matrix comprising weight values of each evaluation index, wherein the weight matrix is expressed as:, wherein ,/>The weight value of the ith evaluation index is k, and the number of the evaluation indexes is k;
the evaluation index matrix and the weight matrix are collected, and a distribution transformer energy efficiency evaluation system is constructed;
the pretreatment for quantifying qualitative indexes specifically comprises the following steps:
performing assignment processing on each qualitative indicator to obtain a first numerical value of each qualitative indicator;
based on the first numerical value of the qualitative index and the type of the qualitative index, carrying out averaging treatment on the first numerical value to obtain data after qualitative index pretreatment;
wherein, carry out the assignment processing to each qualitative index, specifically include: collecting the text comments of each qualitative index, giving a value vector, combining the text comments and the value vector to obtain a first numerical value of each qualitative index, wherein the first numerical value is expressed as, wherein ,Di Text, which is the first value of the ith qualitative rating i The j is the number of the character comments of the qualitative index;
based on the first value of the qualitative index and the type of the qualitative index, carrying out the averaging treatment on the first value, wherein the method specifically comprises the following steps:
determining the type of the qualitative index according to the change trend of the influence on the energy efficiency, and defining the type as a first type and a second type respectively, wherein the first type is positively correlated with the influence on the energy efficiency, and the second type is negatively correlated with the influence on the energy efficiency;
the first numerical processing formula for the first type is:；
the first numerical processing formula for the second type is:；
wherein ,for the first value of the ith qualitative rating after the averaging, the ++>For the limit maximum value in the first value of the ith qualitative rating, < >>For the limit minimum in the first value of the ith qualitative rating,/min->A reference value for the i-th qualitative indicator first value;
giving each evaluation index a weight initial value, specifically comprising:
calculating the entropy value corresponding to each evaluation index based on the characteristic proportion of each evaluation index in all the evaluation indexes;
obtaining a corresponding difference coefficient according to the entropy value of each evaluation index;
calculating a weight initial value of each evaluation index through the difference coefficient;
according to the entropy value of each evaluation index, a corresponding difference coefficient is obtained, and the calculation formula is as follows:
；
wherein ,for the difference coefficient of the ith evaluation index, < +.>The value of the ith evaluation index after quantitative pretreatment;
the weight initial value of each evaluation index is calculated through the difference coefficient, and the calculation formula is as follows:
；
wherein ,the weight initial value of the i-th evaluation index.
2. An apparatus for constructing a power distribution transformer energy efficiency rating system, using the method for constructing a power distribution transformer energy efficiency rating system as defined in claim 1, comprising:
the energy consumption analysis module is used for carrying out energy consumption analysis on the distribution transformer, obtaining a plurality of evaluation indexes of energy efficiency evaluation, classifying all the evaluation indexes into qualitative indexes and quantitative indexes;
the data processing module is used for quantitatively preprocessing the qualitative indexes, endowing each evaluation index with a weight initial value, determining the relative coefficient among the evaluation indexes, and adjusting the weight initial value of each evaluation index to obtain the weight value of each evaluation index;
and the evaluation system construction module is used for associating the evaluation indexes and the corresponding weight values and constructing and obtaining the energy efficiency evaluation system of the distribution transformer.
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