CN111625770A - Energy efficiency evaluation method and system for power distribution network with distributed power supply - Google Patents
Energy efficiency evaluation method and system for power distribution network with distributed power supply Download PDFInfo
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Abstract
The invention discloses an energy efficiency evaluation method and system for a power distribution network with distributed power supplies, which comprises the steps of constructing an energy efficiency evaluation index set of the power distribution network with the distributed power supplies; combining a quantifiable energy efficiency evaluation index set to construct an energy efficiency function containing the operation input and output of the distributed power supply distribution network; solving an energy efficiency function based on an ultra-efficiency model by taking the highest energy efficiency value participating in evaluation of each power distribution network as a target; and performing full sequencing on the evaluation objects according to the solved energy efficiency evaluation values to obtain a sequencing result that the evaluation objects contain the distributed power distribution network. The invention has the beneficial effects that: the influence of subjective factors on the objectivity of the efficiency evaluation result is effectively avoided, the optimal construction sequence of the distributed power supply and the power distribution network is obtained, the input-output ratio is remarkably improved, and the engineering value is high.
Description
Technical Field
The invention relates to the technical field of power grids, in particular to an energy efficiency evaluation method and system for a power distribution network with distributed power supplies.
Background
In recent years, the distributed power supply improves the utilization rate of new energy resources of the power distribution network, reduces the discharge capacity, makes the power distribution network become more complex in the aspects of network structure, evaluation management and the like, and puts higher requirements on maximization of energy efficiency of the power distribution network.
From the operation perspective, the energy efficiency performance of the power distribution network with the distributed power supply can be defined as the efficiency of converting the input of each party participating in operation into the final expected output on the premise of ensuring safe and stable operation and high-quality reliable power supply for different power distribution networks with established grid connection schemes of the distributed power supply. The energy efficiency performance of the power distribution network is determined by energy efficiency functional relations of the operation input indexes and the output indexes of the power distribution network in different scenes, and basic constituent elements of the energy efficiency performance are summarized into operation participants, operation demands and operation outputs. The existing power distribution network energy efficiency evaluation management method usually does not reasonably judge various elements, and particularly subjective factors are easy to influence the objectivity of an energy efficiency evaluation result, so that the evaluation result is not accurate enough.
Disclosure of Invention
This section is for the purpose of summarizing some aspects of embodiments of the invention and to briefly introduce some preferred embodiments. In this section, as well as in the abstract and the title of the invention of this application, simplifications or omissions may be made to avoid obscuring the purpose of the section, the abstract and the title, and such simplifications or omissions are not intended to limit the scope of the invention.
The present invention has been made in view of the above-mentioned conventional problems.
Therefore, one technical problem solved by the present invention is: the energy efficiency evaluation method for the power distribution network with the distributed power supply is capable of comparing and evaluating the energy efficiency of the power distribution network with the distributed power supply and providing a guidance planning and construction scheme.
In order to solve the technical problems, the invention provides the following technical scheme: an energy efficiency evaluation method for a power distribution network with distributed power supplies comprises the steps of constructing an energy efficiency evaluation index set of the power distribution network with the distributed power supplies; combining a quantifiable energy efficiency evaluation index set to construct an energy efficiency function containing the operation input and output of the distributed power supply distribution network; solving an energy efficiency function based on an ultra-efficiency model by taking the highest energy efficiency value participating in evaluation of each power distribution network as a target; and performing full sequencing on the evaluation objects according to the solved energy efficiency evaluation values to obtain a sequencing result that the evaluation objects contain the distributed power distribution network.
As a preferable aspect of the energy efficiency evaluation method for a power distribution network including distributed power sources according to the present invention, the method includes: the construction energy efficiency evaluation index set is constructed by combining the input requirements, expected output and unexpected output of operation participants under an operation framework based on the macroscopic view of the power distribution network.
As a preferable aspect of the energy efficiency evaluation method for a power distribution network including distributed power sources according to the present invention, the method includes: the energy efficiency evaluation index set can measure the production technical efficiency of the operation of the power distribution network, and the basic elements of the energy efficiency evaluation index set comprise power distribution network operation participants, power distribution network operation basic conditions and input requirements of the participants.
As a preferable aspect of the energy efficiency evaluation method for a power distribution network including distributed power sources according to the present invention, the method includes: the power distribution network operation participants comprise a power supply party, a new energy party, a load party and the power distribution network.
As a preferable aspect of the energy efficiency evaluation method for a power distribution network including distributed power sources according to the present invention, the method includes: the basic operating conditions of the power distribution network comprise basic requirements, high-quality requirements and development requirements.
As a preferable aspect of the energy efficiency evaluation method for a power distribution network including distributed power sources according to the present invention, the method includes: the power distribution network energy efficiency evaluation index set comprises an input index set and an output index set.
As a preferable aspect of the energy efficiency evaluation method for a power distribution network including distributed power sources according to the present invention, the method includes: the energy efficiency function is constructed based on a power distribution network energy efficiency evaluation index set, and a weight vector is defined so as to depict the contribution of different energy efficiency evaluation indexes to the energy efficiency function.
As a preferable aspect of the energy efficiency evaluation method for a power distribution network including distributed power sources according to the present invention, the method includes: the solving of the super-efficiency model further comprises the following steps of constructing an initial optimization model; converting the initial optimization model into a linear programming form; improving a linear programming form by adopting an ultra-efficiency model; and solving the final super-efficiency model.
The invention solves another technical problem that: the energy efficiency evaluation system for the power distribution network with the distributed power supply is provided, so that the energy efficiency evaluation method can be realized based on the system.
In order to solve the technical problems, the invention provides the following technical scheme: the energy efficiency evaluation system for the power distribution network with the distributed power supply comprises an index set construction module, a power distribution network evaluation module and a power distribution network evaluation module, wherein the index set construction module is used for constructing an energy efficiency evaluation index set with the distributed power supply power distribution network and refining and quantizing the energy efficiency evaluation index set; the energy efficiency function building module is used for designing an energy efficiency function of a power distribution network with a distributed power supply; a function solving module capable of solving the energy efficiency function constructed by the energy efficiency function constructing module based on the super efficiency model; and the sequencing module can perform full sequencing on the evaluation objects according to the energy efficiency evaluation value and obtain a guidable planning construction scheme containing the distributed power distribution network.
The invention has the beneficial effects that: according to the method, the energy efficiency evaluation method of the power distribution network with the distributed power sources based on the super-efficiency model can be established, the guided planning construction scheme is given while the energy efficiency performance of the existing power distribution network with the distributed power sources is contrastingly evaluated, the optimal weight can be directly obtained based on the actual data of an evaluation object in the process of solving a specific optimization problem, the energy efficiency of the power distribution network with the distributed power sources is globally and objectively quantitatively evaluated, further, the influence of subjective factors on the objectivity of the efficiency evaluation result can be effectively avoided on the premise of limited given budget, the optimal construction sequence of the distributed power sources and the power distribution network is obtained, the input-output ratio is remarkably improved, and the method has a large engineering value.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise. Wherein:
fig. 1 is a schematic overall flow chart of an energy efficiency evaluation method for a power distribution network including distributed power sources according to a first embodiment of the present invention;
fig. 2 is a schematic diagram of a hierarchical condition system for operation of a distribution network designed in the first embodiment of the present invention;
FIG. 3 is a structural diagram of an energy efficiency assessment index set constructed in a first embodiment of the present invention;
fig. 4 is a schematic overall structure diagram of an energy efficiency evaluation system for a power distribution network including distributed power sources according to a second embodiment of the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, specific embodiments accompanied with figures are described in detail below, and it is apparent that the described embodiments are a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making creative efforts based on the embodiments of the present invention, shall fall within the protection scope of the present invention.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than those specifically described and will be readily apparent to those of ordinary skill in the art without departing from the spirit of the present invention, and therefore the present invention is not limited to the specific embodiments disclosed below.
Furthermore, reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one implementation of the invention. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.
The present invention will be described in detail with reference to the drawings, wherein the cross-sectional views illustrating the structure of the device are not enlarged partially in general scale for convenience of illustration, and the drawings are only exemplary and should not be construed as limiting the scope of the present invention. In addition, the three-dimensional dimensions of length, width and depth should be included in the actual fabrication.
Meanwhile, in the description of the present invention, it should be noted that the terms "upper, lower, inner and outer" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation and operate, and thus, cannot be construed as limiting the present invention. Furthermore, the terms first, second, or third are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The terms "mounted, connected and connected" in the present invention are to be understood broadly, unless otherwise explicitly specified or limited, for example: can be fixedly connected, detachably connected or integrally connected; they may be mechanically, electrically, or directly connected, or indirectly connected through intervening media, or may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example 1
Referring to the schematic diagram of fig. 1, the schematic diagram of the overall flow of the energy efficiency evaluation method for the power distribution network with distributed power sources according to the embodiment includes the following steps,
s1: constructing an energy efficiency evaluation index set of a power distribution network containing a distributed power supply; the construction energy efficiency evaluation index set is constructed by combining the input requirements of operation participants, expected output and unexpected output under an operation framework based on the macroscopic power distribution network.
The energy efficiency evaluation index set can measure the production technical efficiency of the operation of the power distribution network, and the basic elements of the energy efficiency evaluation index set comprise power distribution network operation participants, power distribution network operation basic conditions and input requirements of the participants.
Specifically, the power distribution network operation participants comprise a power supply party, a new energy party, a load party and the power distribution network. The power supply side comprises a distribution network upper layer power grid, a different area communication distribution network or a local traditional power plant, such as a thermal power plant, a hydraulic power plant, a pumped storage power plant, a nuclear power plant and the like; the load side mainly participates in the consumption of distribution network electric energy products, and comprises various users capable of actively responding to the power grid requirements, such as electric vehicle charging stations and the like, besides traditional users; the new energy source comprises various small distributed power sources adopting clean energy, such as a distributed wind power generation power source, a distributed photovoltaic power generation power source, various energy storage and the like; the power grid enterprise comprises a power distribution network, a micro-power grid and the like which are used for managing the access of the distributed power supply, can provide various basic devices for the operation of the power distribution network, and is a link between power grid operation participants.
The basic operating conditions of the power distribution network comprise basic requirements, high-quality requirements and development requirements. The basic operation conditions of the power distribution network are based on the premise of ensuring safe and stable operation and high-quality and reliable power supply of the power distribution network, and a layered condition system for operation of the power distribution network designed for the embodiment is shown in figure 2, and the specific conditions of each layer are detailed as follows,
(1) the net rack is characterized in that: and characterizing the configuration conditions of basic hardware equipment of the power distribution network, such as the types of lines and transformers, the power supply radius of feeders or transformer areas and the like. The net rack characteristics play a decisive role in fixed loss in the network loss and part of variable loss under the trend, and the influence degree of the net rack characteristics on the energy efficiency performance of the power distribution network is increased after the network loss is considered as the unexpected output of the power distribution network.
(2) Load characteristics: the characteristics of representing the load size and the change characteristic of the power distribution network, the fluctuation, the impact, the randomness and the like of the load also have great influence on the network loss of the power distribution network. Due to the particularity of the electric energy product, the production, the transportation, the distribution and the consumption need to be carried out simultaneously, so the operation condition is indispensable.
(3) The operation quality is as follows: except for the problems of power supply reliability, accident risk, abnormal use of equipment and the like, the method mainly assigns the problems of power quality in the operation of a power grid, such as voltage deviation, voltage fluctuation, harmonic distortion and the like. The high-quality operation of the power distribution network can greatly improve the energy efficiency of the power distribution network to a certain extent. When the operation quality problem occurs, equipment can be damaged, power failure accidents occur, and huge hidden dangers are brought to safe and stable operation of a power grid.
(4) Energy supply law: in particular to the energy supply of new energy and clean energy. Because the distributed power supply output is influenced by multiple factors, such as illumination intensity, wind speed intensity and the like, the energy supply rule refers to that factors such as time, regions and the like are considered, and the output change of different distributed power supplies to the power distribution network is considered, so that the distributed power supplies can carry out reasonable energy supply, and the energy efficiency of the power distribution network is greatly improved while the network loss is reduced and the operation quality is improved.
(5) Environmental benefits: after new energy is connected to the power grid, the pollution discharge amount of the power distribution network is greatly reduced, the pollution discharge reduction condition of the power distribution network with the distributed power supply is mainly considered in environmental benefits, and the pollution discharge reduction condition is an important factor considered for the power distribution network to perform excellent operation.
(6) Management level: the load party, the power supply party, the new energy party and the power grid enterprise form the whole power distribution network terminal processing factory, cooperation among the load party, the power supply party, the new energy party and the power grid enterprise can be optimized by a high management level, and the production technical efficiency of the power distribution network is improved. When the management level is too low, the energy consumption level of the power distribution network can be weakened, the accident rate is increased, and the safe and stable operation of the power distribution network is influenced.
And considering the network loss of the distribution network and the energy efficiency of the distribution network, and respectively starting from three aspects of basic requirements, high-quality requirements and development requirements of the operation of the distribution network to obtain the operation conditions of the distribution network. The requirements of each layer are deeply divided from bottom to top layer by layer, and the requirements are not repeated and omitted, so that the comprehensiveness of the analysis of the operating conditions is ensured; in each operating condition, the system can be further classified according to the requirement level, the operating conditions are refined, and a multi-layer and multi-stage operating condition system is formed. For example, for the management level, the management level can be classified according to two levels of management loss and quality of the supporting service, and further, a comprehensive condition of the management level can be obtained.
Referring to the schematic diagram of fig. 3, the evaluation index set formed in this embodiment is an energy efficiency evaluation index set including a distributed power distribution network, which is constructed on the basis of high index contribution and easy acquirability, wherein key indexes include equivalent resistance, distributed power permeability, comprehensive cost, operation load, power quality, and pollution discharge reduction amount, specifically,
equivalent resistance X1The basic requirements for representing the characteristics of the network frame in the operation of the distribution network refer to the total equivalent resistance of various basic devices such as distribution network lines, transformers and the like, and play a main decisive role in distribution network tide and network loss, and the calculation formula is as follows,
wherein, X1For distribution network equivalent resistance, RdzlsIs the equivalent resistance of the line s, RdzTkThe unit is ohm for the equivalent resistance of the transformer k.
Permeability of distributed power supply X2The basic requirement of the energy supply rule of the operation of the distribution network is represented, and the basic requirement refers to the proportion of the total power supply electric quantity of the distributed power supply in the total power demand of the distribution network in the evaluation time period. Power distribution under different distributed power grid-connected schemes through evaluationThe grid efficiency performance is large, a guiding scheme can be made for grid connection, and the permeability X of the distributed power supply2The calculation formula of (a) is as follows,
wherein, X2The calculated results are expressed in percentage for the distributed power supply permeability, AdgiIn order to evaluate the active electric quantity generated by the ith distributed power supply in the unit of MW & h, AoThe unit is MW & h for evaluating the sum of the power supply quantity of the distribution network except the distributed power supply in time.
Comprehensive cost X3The method is used for representing the development requirements of the management level of the operation of the power distribution network, comprises the steps of evaluating the investment cost of various power distribution networks containing the distributed power sources in a time period, mainly considering the environmental cost and the commissioning cost which are required to be borne by the power distribution networks containing the distributed power sources in operation, directly influencing the investment enthusiasm of the distributed power sources due to the height of the comprehensive cost, and playing a key role in the height of the installation of the distributed power sources of the power distribution network. Specifically, the estimated formula of the commissioning cost is,
wherein, X3,conα unit is ten thousand yuan for the cost of deliveryiIs the weight coefficient occupied by the ith distributed power supply in the electric quantity cost, AiThe unit is MW & h for the power generation capacity; r is the fixed annual percentage, expressed in percent; n is the investment repayment period, generally equal to the service life of the equipment, and the unit is year; caz,iThe unit of the installation investment cost of the ith distributed power supply is element/(MW & h), k is the average capacity coefficient, namely the ratio of annual energy generation to 8760 × rated power, COM,iThe unit is 0.01 yuan/(MW & h) for the operation and maintenance cost of the ith distributed power supply; cfThis is zero when the fuel used does not need to be purchased, which is the cost of fuel per unit of charge.
The estimated formula of the environmental cost is that,
wherein, X3,envThe unit is ten thousand yuan for the environmental cost; l is the number of types of pollutants; qlThe discharge amount of the first pollutant is expressed in kg; velFor the environmental value discount standard of the first pollutant, VlThe unit of the price is yuan/kg for the emission collection. For example, for greenhouse gases, the environmental value trade-off criteria
And collecting the price for emission. Comprehensive cost X3Mainly the sum of the environmental cost and the commissioning cost.
Running load Y1The basic requirement of the load characteristics representing the operation of the distribution network refers to the total load of a distribution network containing a distributed power supply in the evaluation and statistics time, the index value is the arithmetic sum of all loads of the distribution network in the time period, and the unit is MW & h. The index can be used for measuring the load carrying capacity of an evaluation object, and the size of the operation load reflects the scale of a distribution network and the consumption level of the distribution network to new energy to a certain extent.
Quality of electric energy Y2The method has the advantages that the high-quality requirement of the operation quality of the distribution network is represented, the method is used for analyzing the safe and reliable power supply capability of an evaluation object and evaluating the operation quality level of the distribution network, the distribution network with high-quality operation can reduce the distribution network loss and greatly improve the distribution network energy efficiency, the accident rate can be reduced, and unnecessary risk investment cost can be avoided. Grading is carried out by adopting a grading mode, and the grading method specifically comprises the following steps:
(1) i level, the quality of electric energy is high, and the range of quantitative evaluation value is [0.9,1.0 ];
(2) II, the power quality is good, 1-2 indexes have problems, and the range of the quantitative evaluation value is [0.8,0.9 ];
(3) class III, the power quality is good, possibly several indexes fall behind, and the range of the quantitative evaluation value is [0.7,0.8 ];
(4) IV level, the power quality is general, more indexes have problems, and the range of the quantitative evaluation value is [0.6,0.7 ];
(5) v level, problem is prominent, needs to be managed, and the range of quantitative evaluation values is [0.0,0.6 ].
Pollution discharge reduction amount Y3Representing the high-quality requirement of environmental benefit of the operation of the power distribution network, the high-quality requirement refers to the reduction of pollutant emission when new energy or clean energy replaces the traditional energy for power generation, such as wind power and solar power generation which can provide full green power, and SO released by a micro gas turbine taking natural gas as fuel225% of the released amount of many coal-fired power plants, NOXThe release is less than 1%, and CO2The release amount is less than 40%. Wherein the pollution discharge reduction amount is Y3The calculation of (a) is performed using an empirical formula,
wherein, Y3The pollution discharge reduction amount of the power distribution network after the distributed power supply is connected in the evaluation time is represented by t; lambda [ alpha ]iIs the emission reduction rate of the ith distributed power supply.
Fig. 3 shows the relationship between the energy efficiency evaluation index set of the power distribution network with the distributed power supply and the operation elements thereof, and simultaneously shows an input index set and an output index set decomposed by considering different attributes of the operation input and output of the power distribution network. The assumption is that the object to be evaluated is a set DMU consisting of z power distribution networks with distributed power suppliesz。
Fig. 3 includes an undesirable output indicator, i.e., grid loss. Since the smaller the network loss output, the higher the corresponding energy efficiency assessment value, and the larger the other indexes, the higher the corresponding energy efficiency assessment value, the opposite is true, so it is necessary to first perform the desired transformation on the network loss unexpected output index to obtain the distribution network loss index Y0The conversion formula is as follows,
wherein, YlossFor the network loss unexpected output index, the final index set is divided into an input index set { X }1X2X3And yield index set Y0Y1Y2Y3Two parts. As will be appreciated by those skilled in the art, YlossThe load flow calculation formula can be obtained.
The power distribution network energy efficiency evaluation index set comprises an input index set and an output index set, the indexes are formulated according to actual distribution network engineering investment construction and distribution network operation requirements, and in practical application, in the face of different distributed power distribution networks, experts can confirm and modify the index sets according to specific actual conditions.
S2: and combining a quantifiable energy efficiency evaluation index set to construct an energy efficiency function containing the operation input and output of the distributed power supply distribution network.
Specifically, the energy efficiency function is constructed based on a power distribution network energy efficiency evaluation index set, and a weight vector is defined so as to depict the contribution of different energy efficiency evaluation indexes to the energy efficiency function. In order to embody the core evaluation essence of an input-oriented type and an output-oriented type, the energy efficiency function of a power distribution network containing a distributed power supply is determined by utilizing the relevant influence degree of each output and input, and the weight of each index in an energy efficiency evaluation index set is determined firstly. Let wrInvest the index weight u for the rqAnd the q output index weight. DMUZThe input index of (A) is XZ＝(x1z,x2z,x3z)TThe corresponding weight vector is W ═ W1,w2,w3)TOutput index YZ＝(y0z,y1z,y2z,y3z)TThe corresponding weight vector is U ═ U (U)1,u1,u2,u3)T。
The generalized energy efficiency function of a distribution network including a DG is,
the weight vector of the formula is a to-be-determined parameter, a proper algorithm needs to be selected, reasonable weight vectors W and Q are determined, a proper solving constraint set is given, and the energy efficiency performance of the power distribution network with the distributed power supply can be reasonably evaluated.
S3: solving an energy efficiency function based on an ultra-efficiency model by taking the highest energy efficiency value participating in evaluation of each power distribution network as a target;
specifically, the solution of the super-efficiency model further comprises the following steps,
s3-1: constructing an initial optimization model; by means of an algorithm mechanism of data envelope analysis, W and Q are used as variables, and DMU is usedZEfficiency evaluation value E ofzThe maximum target is set, energy efficiency values of all evaluation objects are used as constraints, and the following optimization model is constructed:
s3-2: converting the initial optimization model into a linear programming form;
the initial optimization model can be converted into a linear programming form by using Charnes-loader changes, specifically, order:
α＝gW
β＝gQ
the initial optimization model can be converted into the following linear programming model:
max Ez＝βTYz
according to the algorithmic mechanism of the data envelope analysis, EzAt maximum, the linear programmed solutions α and β are referred to as DMU' sZThe best weight vector of (2).
S3-3: improving a linear programming form by adopting an ultra-efficiency model;
in this embodiment, a linear programming model is improved by using a data envelope analysis principle, and is transformed by using a dual theorem, so that:
minθc
wherein, XjAnd YjRespectively as evaluated objects DMUjInput and output indicator vector of, DMUjFinger set DMUZThe jth DMU in (1); thetacIs a DMUjEnergy value in data envelope analysis, namely the effective utilization degree of input relative to output; λ ═ λ1,λ2,…,λZ)TIs a constant vector, is a combined coefficient of Z DMUs, λjRelative to DMUZReconfiguring DMU in a DMU active setjThe combination ratio of (A); IS ═ IS (IS)1,is2,is3)TAnd OS ═ s (OS)0,os1,os2,os3)TThe relaxation variable of the input index and the residual variable of the output index.
S3-4: and solving the final super-efficiency model. It can be understood that the model can be expanded or simplified to meet different application occasions according to the actual needs of the energy efficiency performance analysis work of the distributed power supply access power grid and the concerned single indexes.
S4: and performing full sequencing on the evaluation objects according to the solved energy efficiency evaluation values to obtain a sequencing result that the evaluation objects contain the distributed power distribution network.
Scene one:
in order to verify that the energy efficiency evaluation method for the power distribution network with the distributed power supply, which is provided by the embodiment, can obtain the optimal weight based on the actual data of an evaluation object in the aspects of complex power distribution network structure, evaluation management and the like, the effect of subjective factors on the objectivity of an energy efficiency evaluation result is effectively avoided, and the following experiment is used for proving.
Selecting 5 typical low-voltage distribution areas containing distributed power supplies in a certain city of Guangdong province for analysis, wherein basic index data of input index sets and basic index data of output index sets of all evaluation objects come from engineering practice, carrying out evaluation and analysis according to the energy efficiency evaluation method for the power distribution networks containing the distributed power supplies, and carrying out analysis by using a traditional evaluation mode, for convenience of description, the selected 5 power distribution networks are respectively named as distribution networks A, B, C, D and E, and the obtained comparison results are compared as follows:
the result obtained by the traditional evaluation mode is an index table, values corresponding to each single index, such as network loss rate, new energy permeability, investment cost and the like, are listed in the index table, as shown in the following table 1,
table 1: energy efficiency evaluation comparison table obtained under traditional method
The energy efficiency evaluation method for the power distribution network with the distributed power supply, which is provided by the embodiment, is characterized in that a set of comprehensive energy efficiency evaluation system based on multi-level evaluation is constructed according to the attributive characteristics of indexes at each evaluation level and the weight of the indexes, the energy efficiency index value of each power distribution network is calculated, the power distribution networks are sorted according to the energy efficiency index values, and the obtained evaluation sorting results are shown in the following table 2,
table 2: energy efficiency evaluation comparison table obtained by the method in the embodiment
| Sorting | Name of distribution network | Energy efficiency index value |
| 1 | Distribution network D | 1.78 |
| 2 | Distribution network A | 1.73 |
| 3 | Distribution network B | 1.21 |
| 4 | Distribution network E | 1.11 |
| 5 | Distribution network C | 0.93 |
The method can be used for comparing the distribution networks with the comprehensive energy efficiency values, providing reference for the work of researchers and engineers, and effectively solving the problems that the indexes are independent and dispersed, the quantity is large, and the comprehensive energy efficiency cannot be represented intuitively. Therefore, the method can effectively solve the problems that the energy efficiency performance of the power distribution network and the influence factors for determining the height of the energy efficiency performance are complex, the network loss change uncertainty after the grid connection of the distributed power supply improves the distribution network energy efficiency assessment difficulty and the like, and has good popularization value due to the reasonability and the engineering practicability.
Example 2
Referring to the schematic diagram of fig. 4, the energy efficiency evaluation system for a power distribution network with distributed power supplies according to this embodiment is schematically illustrated, and the energy efficiency evaluation method for the power distribution network with distributed power supplies according to this embodiment can be implemented based on this system.
Specifically, the system comprises an index set building module 100, an energy efficiency function building module 200, a function solving module 300 and a ranking module 400, wherein,
the index set building module 100 can consider the inherent characteristics of the energy efficiency performance of the power distribution network from the operation perspective, clarify the operation participants and the operation conditions of the power distribution network with the distributed power supply, and build an energy efficiency evaluation index set of the power distribution network with the distributed power supply by combining the network loss unexpected output of the operation of the power distribution network, and refine and quantify the energy efficiency evaluation index set;
under the macroscopic operation framework of the power distribution network, the energy efficiency function construction module 200 takes a relevant theoretical mechanism of comprehensive evaluation and efficiency determination as a research entry point, considers the multi-dimensionality of the operation output of the power distribution network, comprehensively utilizes the relevant influence degrees of each output and input, and designs an energy efficiency function of the power distribution network with the distributed power supply
The function solving module 300 can solve the energy efficiency function constructed by the energy efficiency function constructing module 200 based on the super efficiency model;
the ranking module 400 can fully rank the evaluation objects according to the energy efficiency evaluation values and obtain a guidable planning construction scheme including the distributed power distribution network.
It should be recognized that embodiments of the present invention can be realized and implemented by computer hardware, a combination of hardware and software, or by computer instructions stored in a non-transitory computer readable memory. The methods may be implemented in a computer program using standard programming techniques, including a non-transitory computer-readable storage medium configured with the computer program, where the storage medium so configured causes a computer to operate in a specific and predefined manner, according to the methods and figures described in the detailed description. Each program may be implemented in a high level procedural or object oriented programming language to communicate with a computer system. However, the program(s) can be implemented in assembly or machine language, if desired. In any case, the language may be a compiled or interpreted language. Furthermore, the program can be run on a programmed application specific integrated circuit for this purpose.
Further, the operations of processes described herein can be performed in any suitable order unless otherwise indicated herein or otherwise clearly contradicted by context. The processes described herein (or variations and/or combinations thereof) may be performed under the control of one or more computer systems configured with executable instructions, and may be implemented as code (e.g., executable instructions, one or more computer programs, or one or more applications) collectively executed on one or more processors, by hardware, or combinations thereof. The computer program includes a plurality of instructions executable by one or more processors.
Further, the method may be implemented in any type of computing platform operatively connected to a suitable interface, including but not limited to a personal computer, mini computer, mainframe, workstation, networked or distributed computing environment, separate or integrated computer platform, or in communication with a charged particle tool or other imaging device, and the like. Aspects of the invention may be embodied in machine-readable code stored on a non-transitory storage medium or device, whether removable or integrated into a computing platform, such as a hard disk, optically read and/or write storage medium, RAM, ROM, or the like, such that it may be read by a programmable computer, which when read by the storage medium or device, is operative to configure and operate the computer to perform the procedures described herein. Further, the machine-readable code, or portions thereof, may be transmitted over a wired or wireless network. The invention described herein includes these and other different types of non-transitory computer-readable storage media when such media include instructions or programs that implement the steps described above in conjunction with a microprocessor or other data processor. The invention also includes the computer itself when programmed according to the methods and techniques described herein. A computer program can be applied to input data to perform the functions described herein to transform the input data to generate output data that is stored to non-volatile memory. The output information may also be applied to one or more output devices, such as a display. In a preferred embodiment of the invention, the transformed data represents physical and tangible objects, including particular visual depictions of physical and tangible objects produced on a display.
As used in this application, the terms "component," "module," "system," and the like are intended to refer to a computer-related entity, either hardware, firmware, a combination of hardware and software, or software in execution. For example, a component may be, but is not limited to being: a process running on a processor, an object, an executable, a thread of execution, a program, and/or a computer. By way of example, both an application running on a computing device and the computing device can be a component. One or more components can reside within a process and/or thread of execution and a component can be localized on one computer and/or distributed between two or more computers. In addition, these components can execute from various computer readable media having various data structures thereon. The components may communicate by way of local and/or remote processes such as in accordance with a signal having one or more data packets (e.g., data from one component interacting with another component in a local system, distributed system, and/or across a network such as the internet with other systems by way of the signal).
It should be noted that the above-mentioned embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.
Claims (9)
1. An energy efficiency evaluation method for a power distribution network with distributed power supplies is characterized by comprising the following steps: comprises the steps of (a) preparing a mixture of a plurality of raw materials,
constructing an energy efficiency evaluation index set of a power distribution network containing a distributed power supply;
combining a quantifiable energy efficiency evaluation index set to construct an energy efficiency function containing the operation input and output of the distributed power supply distribution network;
solving an energy efficiency function based on an ultra-efficiency model by taking the highest energy efficiency value participating in evaluation of each power distribution network as a target;
and performing full sequencing on the evaluation objects according to the solved energy efficiency evaluation values to obtain a sequencing result that the evaluation objects contain the distributed power distribution network.
2. The energy efficiency assessment method for the power distribution network with distributed power sources according to claim 1, characterized in that: the construction energy efficiency evaluation index set is constructed by combining the input requirements, expected output and unexpected output of operation participants under an operation framework based on the macroscopic view of the power distribution network.
3. The energy efficiency assessment method for the power distribution network including the distributed power sources according to claim 2, wherein: the energy efficiency evaluation index set can measure the production technical efficiency of the operation of the power distribution network, and the basic elements of the energy efficiency evaluation index set comprise power distribution network operation participants, power distribution network operation basic conditions and input requirements of the participants.
4. The energy efficiency assessment method for the power distribution network including the distributed power sources according to claim 3, wherein: the power distribution network operation participants comprise a power supply party, a new energy party, a load party and the power distribution network.
5. The energy efficiency evaluation method for the power distribution network with the distributed power sources as claimed in any one of claims 2 to 4, wherein: the basic operating conditions of the power distribution network comprise basic requirements, high-quality requirements and development requirements.
6. The energy efficiency assessment method for the power distribution network including the distributed power sources according to claim 5, wherein: the power distribution network energy efficiency evaluation index set comprises an input index set and an output index set.
7. The energy efficiency assessment method for the power distribution network including the distributed power sources according to claim 6, wherein: the energy efficiency function is constructed based on a power distribution network energy efficiency evaluation index set, and a weight vector is defined so as to depict the contribution of different energy efficiency evaluation indexes to the energy efficiency function.
8. The energy efficiency evaluation method for the power distribution network including the distributed power sources according to claim 6 or 7, wherein: the solution of the super-efficiency model further comprises the steps of,
constructing an initial optimization model;
converting the initial optimization model into a linear programming form;
improving a linear programming form by adopting an ultra-efficiency model;
and solving the final super-efficiency model.
9. An energy efficiency assessment system for a power distribution network with distributed power supplies, characterized in that: comprises the steps of (a) preparing a mixture of a plurality of raw materials,
the index set construction module (100), the index set construction module (100) is used for constructing an energy efficiency evaluation index set of a power distribution network with distributed power supplies and refining and quantifying the energy efficiency evaluation index set;
the energy efficiency function building module (200), the energy efficiency function building module (200) is used for designing an energy efficiency function of a power distribution network with distributed power supplies;
a function solving module (300), wherein the function solving module (300) can solve the energy efficiency function constructed by the energy efficiency function constructing module (200) based on the super efficiency model;
the sequencing module (400) can perform full sequencing on the evaluation objects according to the energy efficiency evaluation values and obtain a guidable planning construction scheme containing the distributed power distribution network.
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