CN108596476B

CN108596476B - Power supply transmission power grid project operation benefit evaluation method and system

Info

Publication number: CN108596476B
Application number: CN201810367001.8A
Authority: CN
Inventors: 张恒; 郑燕; 雷体钧; 温卫宁; 汪亚平; 易文飞; 邵黎; 陈立; 谭凌峰; 何砚; 李如萍; 吕岳; 翟树军; 杨丽萍; 彭婧; 胡本哲; 张轶姿
Original assignee: State Grid Economic And Technological Research Institute Co LtdB412 State Grid Office; State Grid Tianjin Electric Power Co Ltd
Current assignee: State Grid Economic And Technological Research Institute Co LtdB412 State Grid Office; State Grid Tianjin Electric Power Co Ltd
Priority date: 2018-04-23
Filing date: 2018-04-23
Publication date: 2021-12-07
Anticipated expiration: 2038-04-23
Also published as: CN108596476A

Abstract

The invention relates to a power supply transmission power grid project operation benefit evaluation method and a system, which comprises the following contents: collecting power data which are sent by a power supply to be evaluated to the actual operation of a power grid project; evaluating the project efficiency of the power supply sending power grid project according to the collected power data; evaluating the project effect of the power supply transmitted to the power grid project according to the collected power data; evaluating the project safety of the power supply transmission power grid project according to the collected power data; and comprehensively evaluating the operation benefit of the power supply transmission power grid project according to the evaluation results of the project efficiency, the project effect and the project safety.

Description

Power supply transmission power grid project operation benefit evaluation method and system

Technical Field

The invention relates to a power supply transmission power grid project operation benefit evaluation method and system, and relates to the technical field of power grid transmission.

Background

At present, two methods are generally used for evaluating the operation benefit of a power grid engineering project, and one method is to evaluate the operation benefit of the power grid engineering project with all functional types by adopting the same index system. Because the functions of the power transmission and transformation project in the power grid are different, the evaluation indexes and the evaluation standards of the power transmission and transformation project are different, for example, the safety requirement of the power supply project of the electric railway is high, the requirement on the load rate is relatively low, the requirement on the load rate of the power demand project is high, all projects are evaluated by adopting uniform indexes and standards, the functional attribute characteristics of the project are ignored, a targeted suggestion cannot be provided for the subsequent construction of the project, and the evaluation method cannot fully reflect whether the fundamental objective of the project construction is realized; the other type is that the power grid engineering project is divided into public network engineering, special power transmission and transformation engineering and networking engineering, and different evaluation indexes are respectively set for each engineering to evaluate the operating benefits of the project from the aspects of space and physical level of the engineering in the power grid. In addition, the indexes related in the two methods are not set with evaluation standards, and the subjectivity of the evaluation process is strong. In summary, no research has been made so far to construct an evaluation system for power grid project with pertinence from the perspective of different functions of the project system, and to provide an evaluation index and clarify an evaluation standard.

Disclosure of Invention

In view of the above problems, an object of the present invention is to provide a method and a system for evaluating the operation efficiency of a power transmission grid project, which can accurately evaluate the grid project from the viewpoint of different functions of the project system.

In order to achieve the purpose, the invention adopts the following technical scheme: in a first aspect, the invention provides a power supply grid project operation benefit evaluation method, which comprises the following steps: collecting power data which are sent by a power supply to be evaluated to the actual operation of a power grid project; evaluating the project efficiency of the power supply sending out of the power grid project according to the collected power data, wherein the project efficiency evaluation indexes comprise newly increased line quantity system occupation ratio, newly increased line length system occupation ratio, newly increased unit capacity system occupation ratio and buckle current check; evaluating the project effect of the power supply transmitted out of the power grid project according to the collected power data, wherein the project effect evaluation indexes comprise the maximum load rate of the engineering transformer, the average load rate of the engineering transformer, the maximum load rate of a line, the average load rate of the line, the loss of an overhead line, the loss of a main transformer, the power quantity of the on-line power, the power factor at the maximum load moment, the power factor at the minimum load moment and the number of times of influencing the quality of the electric energy; evaluating the project safety of the power supply transmission power grid project according to the collected power data, wherein the evaluation indexes of the project safety comprise line availability, bus voltage qualification rate, the occurrence frequency of power grid safety accidents, the misoperation and operation rejection frequency of a relay protection and stability device, the unplanned line outage hours, the unplanned line outage frequency, the line trip-out rate and the unplanned transformer outage time; and comprehensively evaluating the operation benefit of the power supply transmission power grid project according to the evaluation results of the project efficiency, the project effect and the project safety.

Further, the project efficiency of the power supply sending-out power grid project is evaluated according to the collected power data, and the specific evaluation process is as follows:

system proportion K for calculating number of newly added lines_l1：K_l1＝C_l/ΣC_lIn the formula, Σ C_lFor the number of lines of the same voltage class of the system before commissioning, C_lAdding new lines to the project according to K_l1Evaluating the engineering importance, and recording the evaluation result as D₁₁；

Calculating the proportion K of the newly added line length to the total line length of the system_l2：K_l2＝L_l/∑L_lIn the formula, Σ L_lThe length of the same voltage class line of the system before commissioning, L_lAdding new line length for the project according to K_l2Evaluating the engineering importance, and recording the evaluation result as D₁₂；

Calculating the proportion K of newly-accessed installed capacity in engineering to installed capacity of system before operation_g，K_g＝S_g/ΣS_gIn the formula, Σ S_gFor the pre-commissioning system installed capacity, S_gNew access to installed capacity for this project, according to K_gEvaluating the engineering importance, and recording the evaluation result as D₁₃；

Calculating the ratio R of the actual line running current to the line bayonet current_ab，R_ab＝C_a/C_bIn the formula, C_aFor line running of actual current, C_bFor line-card current, according to R_abThe importance of the project is evaluated, and the evaluation result is extremely D₁₄(ii) a Calculating D from the above results₁：D₁＝a₁₁D₁₁+a₁₂D₁₂+a₁₃D₁₃+a₁₄D₁₄According to D₁Evaluating whether the construction of the project has significant capability of power supply delivery, wherein a₁₁、a₁₂、a₁₃、a₁₄Respectively the system occupation ratio of the number of the newly added lines, the system occupation ratio of the length of the newly added lines, the system occupation ratio of the capacity of the newly added unit and the weight of the buckle current check in the efficiency evaluation,

a₁₁+a₁₂+a₁₃+a₁₄＝1。

further, the specific evaluation process for evaluating the project effect of the power supply transmission power grid project according to the collected power data is as follows:

calculating the times J of influencing the power quality assessment, carrying out engineering operation effect evaluation according to the times of influencing the power quality assessment, and recording the evaluation result as D₂₀According to whether the engineering operation effect reaches the expected pair D₂₀Setting the value of (c);

calculating the maximum load factor mu of the engineering transformer_max,t，μ_max,t＝P_max,t/S_tIn the formula, P_max,tFor the maximum load of the transformer, S_tFor the rated capacity of the transformer, the evaluation result is recorded as D₂₁According to whether the engineering operation effect reaches the expected pair D₂₁Setting the value of (c);

calculating the average load factor mu of the engineering transformer_avg,t：μ_avg,t＝P_avg,t/S_tIn the formula, mu_avg,tThe average load factor of the transformer is obtained; p_avg,tIs the annual average load of the transformer, S_tSetting the age limit time for rated capacity of the transformer and operation of the transformer, evaluating the engineering operation effect according to the interval of the average load rate of the transformer, and recording the evaluation result as D₂₂According to whether the engineering operation effect reaches the expected pair D₂₂Setting the value of (c);

calculating circuitMaximum load factor mu_max,1：μ_max,1＝P_max,1/S₁In the formula, mu_max,1The maximum load rate of the line; p_max,lFor the maximum load on the line, S_lEvaluating the engineering operation effect according to the interval of the maximum load rate of the line after the line is put into operation for setting the age limit for the rated capacity of the line, and recording the evaluation result as D₂₃According to whether the engineering operation effect reaches the expected pair D₂₃Setting the value of (c);

calculating the average load factor mu of the line_avg,1：μ_avg,1＝P_avg,1/S₁In the formula, mu_avg,1Is the average load rate of the line; p_avg,lThe annual average load of the line; s_lA line with rated capacity; after the set time of commissioning, evaluating the engineering operation effect according to the line average load percentage interval, and recording the evaluation result as D₂₄According to whether the engineering operation effect reaches the expected pair D₂₄Setting the value of (c);

calculating overhead line loss Q_l,l：Q_l.l＝Q_in-Q_outIn the formula, Q_inFor input of electric power, Q, to the transformer_outEvaluating the engineering operation effect according to the overhead line loss for the output electric quantity of the transformer, and recording the evaluation result as D₂₅According to whether the engineering operation effect reaches the expected pair D₂₅Setting the value of (c);

calculating main transformer loss Q_l,t，Q_l.t＝Q_in-Q_outIn the formula, Q_l,tFor main transformer losses, Q_inFor input of electric power, Q, to the transformer_outFor the transformer output electric quantity, the engineering operation effect is evaluated according to the main transformer loss, and the evaluation result is recorded as D₂According to whether the engineering operation effect reaches the expected pair D₂₆Setting the value of (c);

calculating the internet surfing electric quantity Q obtained from a power supply after the project is put into operation_upEvaluating the engineering operation effect according to the online electric quantity, and recording the evaluation result as D₂₇According to whether the engineering operation effect reaches the expected pair D₂₇Setting the value of (c);

calculating the power factor at the moment of maximum load

In the formula, S is the apparent power transmitted by the equipment at the moment of maximum load, P is the active power transmitted by the equipment at the moment of maximum load, Q is the reactive power transmitted by the equipment at the moment of maximum load, the engineering operation effect evaluation is carried out according to the power factor at the moment of maximum load, and the evaluation result is recorded as D₂₈According to whether the engineering operation effect reaches the expected pair D₂₈Setting the value of (c);

calculating the power factor at the moment of minimum load

In the formula, S is apparent power transmitted by the equipment at the moment of minimum load, P is active power transmitted by the equipment at the moment of minimum load, Q is reactive power transmitted by the equipment at the moment of minimum load, engineering operation effect evaluation is carried out according to the power factor at the moment of minimum load, and the evaluation result is recorded as D₂₉According to whether the engineering operation effect reaches the expected pair D₂₉Setting the value of (c);

calculating D from the above index₂According to D₂The comparison result with the preset threshold value is processed by engineeringEvaluation of the effects:

D₂＝a₂₀D₂₀+a₂₁D₂₁+a₂₂D₂₂+a₂₃D₂₃+a₂₄D₂₄+a₂₅D₂₅+a₂₆D₂₆+a₂₇D₂₇+a₂₈D₂₈+a₂₉D₂₉

wherein, a₂₀、a₂₁、a₂₂、a₂₃、a₂₄、a₂₅、a₂₆、a₂₇、a₂₈、a₂₉Respectively the weight of 10 indexes of the number of times of checking the quality of the electric energy, the maximum load rate of the engineering transformer, the average load rate of the engineering transformer, the maximum load rate of a line, the average load rate of the line, the loss of an overhead line, the loss of a main transformer, the quantity of the on-grid electricity, the power factor at the moment of the maximum load and the power factor at the moment of the minimum load in effect evaluation, a₂₀+a₂₁+a₂₂+a₂₃+a₂₄+a₂₅+a₂₆+a₂₇+a₂₈+a₂₉＝1。

Further, the specific evaluation process for evaluating the project safety of the power supply transmission power grid project according to the collected power data comprises the following steps:

calculating line availability A_L：

Wherein u is the forced outage rate, T_rMean time to failure, T_ΣAAccumulating fault-free operating time, T, for the plant_ΣFor accumulating the commissioning time, the engineering safety and reliability are evaluated according to the availability of the line, and the evaluation result is D₃₁Indicates, according to the degree of engineering safety reliability, the pair D₃₁Determining a value;

calculating the qualification rate eta of A-phase voltage of project bus_A：η_A(％)＝(1-T_b/T_Σ) 100% of formula (i), wherein eta_AFor project bus A phase voltage qualification rate, T_bFor voltage out-of-limit accumulated time, T_ΣAnd (4) counting time for the total operation of the project, evaluating the engineering safety reliability according to the qualification rate of the A-phase voltage of the bus, and recording the evaluation result as D₃₂According to the degree of engineering safety reliability, pair D₃₂Determining a value;

counting the occurrence frequency J of the grid safety accident_aEvaluating the engineering safety reliability according to the occurrence frequency of the power grid safety accidents, and recording the evaluation result as D₃₃According to the degree of engineering safety reliability, pair D₃₃Determining a value;

calculating the times J of false operation and refusal operation of relay protection and safety device in the project or safety device at other positions in the power grid caused by project operation_JEvaluating the engineering safety reliability according to the misoperation and the failure times of the relay protection and stability device, and recording the evaluation result as D₃₄According to the degree of engineering safety reliability, pair D₃₄Determining a value;

obtaining the number sigma T of the unplanned shutdown hours of the line_d.lEvaluating the engineering safety reliability according to the unplanned outage hours of the line, and recording the evaluation result as D₃₅According to the degree of engineering safety reliability, pair D₃₅Determining a value;

statistical circuit unplanned outage frequency f_lEvaluating the engineering safety reliability according to the unplanned shutdown frequency of the line, and recording the evaluation result as D₃₆According to the degree of engineering safety reliability, pair D₃₆Determining a value;

calculating the trip rate caused by the external environment or insulation problem of the line operation: λ is M/T, where λ is the trip rate of the line, M is the total number of trips within a statistical period, which are not caused by the capacity of the line or insulation problems, T is the evaluation time, the engineering safety and reliability are evaluated according to the trip rate of the line, and the evaluation result is recorded as D₃₇According to the degree of engineering safety reliability, pair D₃₇Determining a value;

statistics of unplanned transformer outage time sigma T_d.tEvaluating and evaluating the engineering safety reliability according to the unplanned outage hours of the transformerThe valence result is noted as D₃₈According to the degree of engineering safety reliability, pair D₃₈Determining the value of (c);

evaluating engineering safety according to the above indexes, and using D as evaluation result₃Represents: d₃＝a₃₁D₃₁+a₃₂D₃₂+a₃₃D₃₃+a₃₄D₃₄+a₃₅D₃₅+a₃₆D₃₆+a₃₇D₃₇+a₃₈D₃₈Wherein a is₃₁、a₃₂、a₃₃、a₃₄、a₃₅、a₃₆、a₃₇、a₃₈Respectively the line availability, the bus voltage qualification rate, the grid safety accident occurrence frequency, the misoperation and failure frequency of the relay protection and safety device, the unplanned line outage hours, the unplanned line outage frequency, the line trip-out rate and the unplanned transformer outage time in the efficiency evaluation, a₃₁+a₃₂+a₃₃+a₃₄+a₃₅+a₃₆+a₃₇+a₃₈1 is ═ 1; according to D₃And evaluating whether the engineering safety reliability is qualified or not according to a comparison result with a preset value.

Further, according to the evaluation results of project efficiency, project effect and project safety, the comprehensive evaluation of the operation effect of the power supply transmission power grid project is carried out, and the specific process is as follows:

1) calculating a running effect comprehensive evaluation value, wherein the calculation formula of the running effect comprehensive evaluation is as follows:

D＝a₁D₁+a₂D₂+a₃D₃

wherein, a₁、a₂、a₃Respectively, project efficiency D₁Project effect D₂Project safety D₃Weight of a₁+a₂+a₃＝1；

2) When D is less than the set minimum threshold, the project is considered to be sent out of the power grid as a power supply, and the overall operation effect of the project is poor;

when the set minimum threshold value is not more than D and less than the set maximum threshold value, the project is considered as a power supply to be sent out of the power grid project, and the overall operation effect is good;

and when the D is larger than or equal to the set maximum threshold value, the project is considered to be sent out of the power grid project as a power supply, and the overall operation effect is good.

Further, said a₁、a₂、a₃And solving by adopting a weight solving algorithm of subjective and objective weight combination of an index classification reference comparison method.

Further, before calculating the running effect comprehensive evaluation value D, the method further includes:

determination of D₁、D₂、D₃Comment level domain;

for efficiency D₁Evaluating and determining comment grade domain as d₁＝{d₁₁,d₁₂,d₁₃In which d is₁₁Represents importance, d₁₂Representing general importance, d₁₃The representation is not critical;

for effect D₂Evaluation determination of discourse Domain as d₂＝{d₂₁,d₂₂In which d is₂₁Representing satisfaction of the demand, d₂₂Representing an unsatisfied demand;

for safety D₃Evaluation determination of discourse Domain as d₃＝{d₃₁,d₃₂In which d is₃₁Represents pass, d₃₂Is not qualified;

the above qualitative evaluations were converted into numerical values.

In a second aspect, the present invention further provides a system for evaluating operation benefits of a power grid project, where the system includes: the data acquisition module is used for acquiring power data of the power supply to be evaluated, which is sent out of the actual operation of the power grid project; the project efficiency evaluation module is used for evaluating the project efficiency of the power supply sending power grid project according to the collected power data, wherein the project efficiency evaluation indexes comprise a newly added line quantity system occupation ratio, a newly added line length system occupation ratio, a newly added unit capacity system occupation ratio and buckle current verification; the project effect evaluation module is used for evaluating the project effect of the power supply transmission power grid project according to the collected power data, wherein the project effect evaluation indexes comprise the maximum load rate of an engineering transformer, the average load rate of the engineering transformer, the maximum load rate of a line, the average load rate of the line, the loss of an overhead line, the loss of a main transformer, the power quantity of the internet, the power factor at the maximum load moment, the power factor at the minimum load moment and the number of times of influencing power quality examination; the project safety evaluation module is used for evaluating the project safety of the power supply transmission power grid project according to the collected power data, wherein the evaluation indexes of the project safety include the line availability, the bus voltage qualification rate, the grid safety accident occurrence frequency, the misoperation and refusal frequency of the relay protection and safety device, the unplanned outage hours of the line, the unplanned outage frequency of the line and the trip rate of the line; and the comprehensive evaluation module is used for comprehensively evaluating the operation benefit of the power supply transmission power grid project according to the evaluation results of the project efficiency, the project effect and the project safety.

Due to the adoption of the technical scheme, the invention has the following advantages: 1. the invention provides an operation benefit evaluation method for power supply transmission power grid engineering from the aspect of engineering project system function positioning, and solves the problem that the engineering is difficult to evaluate after operation. 2. The invention establishes the power supply delivery power grid engineering operation evaluation index from three dimensions of efficiency, effect and safety, can directly reflect the maximum function and actual play function of a newly-built engineering project in a power grid, and reflects the contribution 3 of the engineering to the aspect of guaranteeing the power supply delivery. 4. The invention adopts a weight solving algorithm of subjective and objective weight combination based on an index classification reference comparison method for determining a weight aggregation calculation process of subjective and objective influence factors in combination with evaluation indexes, and can solve the problem that the application of an analytic hierarchy process is often limited in practice in multi-order dimension constraint, thereby realizing accurate weight values under the multi-index evaluation situation. 5. The invention has the advantages of strong pertinence of evaluation indexes, clear evaluation standard and scientific weight determination method, the evaluation result directly acts on the future operation management work of the project, and the invention has important guiding function on the construction management of the project of transmitting power supply to the power grid in the future.

Drawings

FIG. 1 is a schematic flow chart of a power supply delivery grid project operation benefit evaluation method of the invention;

FIG. 2 is a schematic diagram of the weight solving algorithm based on the index classification reference comparison method (ICRC) subjective and objective weight combination.

Detailed Description

The present invention is described in detail below with reference to the attached drawings. It is to be understood, however, that the drawings are provided solely for the purposes of promoting an understanding of the invention and that they are not to be construed as limiting the invention.

The invention evaluates the operation effect of the power supply transmission power grid project from three dimensions of efficiency, effect and safety.

Efficiency: the setting of the efficiency evaluation index aims to reflect the maximum effect that the project guarantees that the power supply output can play in a power grid system in which the project is located after the project is put into operation, and whether the power supply output capacity of the project construction is obvious or not is mainly pointed by the evaluation result.

The effect is as follows: the setting of the effect evaluation index aims to reflect the actual operation condition in the engineering operation process, and whether the actual effect exerted by the operation of the engineering in the aspect of guaranteeing the power supply output is met or not is the evaluation result.

Safety: the setting of the safety evaluation index aims to reflect the conditions of the engineering in the aspects of safety, reliability and the like as public infrastructure, and the evaluation result mainly points to whether the safety and reliability of the engineering meet the basic requirements of the power grid engineering.

Example 1

As shown in fig. 1, the method for evaluating the operation benefit of the power grid project with power delivered out provided by the invention comprises the following steps:

1. and collecting power data of a certain power supply to be evaluated and transmitting the power data to the actual operation of the power grid project.

2. Evaluating the project efficiency of the power supply sending out of the power grid project according to the collected power data, wherein the project efficiency evaluation indexes comprise newly increased line quantity system occupation ratio, newly increased line length system occupation ratio, newly increased unit capacity system occupation ratio and buckle current check, and the specific evaluation process of each evaluation index on the project efficiency is as follows:

1) system ratio of newly added line quantity

Calculating the ratio K of the number of newly added lines to the number of system lines_l1And evaluating the contribution effect of the quantity of the newly added lines of the project on the system.

K_l1＝C_l/ΣC_l

In the formula, Sigma C_lFor the number of lines of the same voltage class of the system before commissioning, C_lAnd adding the number of the circuits for the project. To K_l1The engineering importance evaluation is carried out according to percentage value intervals, and the evaluation result is recorded as D₁₁. When K is_l1Greater than 10%, the project is considered important, D₁₁100; when K is_l1Between 5% and 10%, engineering is considered important, D₁₁80; when K is_l1Between 3% and 5%, considered generally important, D₁₁60; when K is_l1Less than 3%, the engineering is considered less important, D₁₁＝40。

2) New line length system ratio

Calculating the proportion K of the newly added line length to the total line length of the system_l2And evaluating the contribution effect of the length of the newly added line of the project on the system.

K_l2＝L_l/∑L_l

In the formula, Σ L_lThe length of the same voltage class line of the system before commissioning, L_lThe length of the line is newly increased for the project. To K_l2The engineering importance evaluation is carried out according to percentage value intervals, and the evaluation result is recorded as D₁₂. When K is_l2Greater than 10%, the project is considered important, D₁₂100; when K is_l2Between 5% and 10%, engineering is considered important, D₁₂80; when K is_l2Between 3% and 5%, generally regarded as important, D₁₂60; when K is_l2Less than 3%, the engineering is considered less important, D₁₂＝40。

3) Capacity system proportion of newly added unit

Calculating the proportion K of newly-accessed installed capacity in engineering to installed capacity of system before operation_gAnd evaluating the contribution effect of the newly added installed capacity of the project on the system in which the newly added installed capacity is located.

K_g＝S_g/ΣS_g

In the formula, sigma S_gFor the pre-commissioning system installed capacity, S_gAnd newly accessing installed capacity for the project. To K_gThe engineering importance evaluation is carried out according to percentage value intervals, and the evaluation result is recorded as D₁₃. When K is_gGreater than 5%, the project is considered important, D₁₃100; when K is_gGreater than 10%, engineering is considered important, D₁₃80; when K is_gBetween 3% and 5%, generally regarded as important, D₁₃60; when K is_gLess than 3%, the engineering is considered less important, D₁₃＝40。

4) Checking ratio of bayonet current

Calculating the ratio R of the actual line running current to the line bayonet current_abAnd evaluating the maximum limit level of current supply when the project is in normal operation. The current of the line bayonet is determined by the minimum value of rated capacity of equipment such as a line section, switches at two ends of the line, a mutual inductor, a wave trap and the like.

R_ab＝C_a/C_b

In the formula, C_aFor line running of actual current, C_bIs a line card port current. To R_abThe engineering importance evaluation is carried out according to percentage value intervals, and the evaluation result is recorded as D₁₄. When R is_abBetween 50% and 90%, considered important for engineering, D₁₄100; when R is_abBetween 30% and 50%, considered important, D₁₄80; when R is_abLess than 30%, the engineering is considered less important, D₁₄40; when R is_abWhen the content is more than 90%, the engineering is considered to have design defects, the efficiency performance exceeds the safety standard, and D₁₄＝0。

5) Determination of engineering performance evaluation index weight

The invention determines the index weight by adopting index-based classification reference comparisonThe weight solving algorithm of the subjective and objective weight combination of the method (ICRC) is used for solving, and a can be determined₁₁、a₁₂、a₁₃、a₁₄Wherein, a₁₁、a₁₂、a₁₃、a₁₄Respectively weighing 4 indexes of system occupation ratio of the number of newly added lines, system occupation ratio of the length of the newly added lines, system occupation ratio of the capacity of the newly added unit and buckling current verification in the efficiency evaluation, and a₁₁+a₁₂+a₁₃+a₁₄＝1。

Evaluating whether the engineering construction has obvious effect on guaranteeing power supply delivery according to the efficiency calculation result, and using D as evaluation result₁Represents:

D₁＝a₁₁D₁₁+a₁₂D₁₂+a₁₃D₁₃+a₁₄D₁₄

when the evaluation result D₁When the power supply capacity is more than or equal to 80, the construction of the project is considered to be remarkable for the power supply sending capacity; when the evaluation result is 60. ltoreq.D₁If the power supply voltage is less than 80, the construction of the project is considered to have general power supply sending capacity; when the evaluation result D₁If < 60, the construction of the project is considered to be poor in power supply output capability.

3. Evaluating the project effect of the power supply transmission power grid project according to the collected power data, wherein the project effect evaluation indexes comprise the maximum load rate of the engineering transformer, the average load rate of the engineering transformer, the maximum load rate of a line, the average load rate of the line, the loss of an overhead line, the loss of a main transformer, the power of the internet, the power factor at the moment of the maximum load, the power factor at the moment of the minimum load and the number of times of influencing the power quality examination, and the specific evaluation process of each evaluation index on the project effect is as follows:

1) maximum load factor of engineering transformer

Calculating the maximum load factor mu of the engineering transformer_max,tAnd evaluating the maximum load condition of the engineering transformer.

μ_max,t＝P_max,t/S_t

In the formula, P_max,tThe maximum load of the transformer, unit MW; s_tFor transformersRated capacity, in MVA.

After the transformer is put into operation for one year, evaluating the engineering operation effect according to the percentage interval of the maximum load rate, and recording the evaluation result as D₂₁. When mu is_max,tWhen the maximum load condition of the engineering transformer is more than 40 percent, the maximum load condition of the engineering transformer is considered to basically realize the planning target, the selection of the main transformer capacity is reasonable, the engineering operation effect meets the expected requirement, and D₂₁100; otherwise, the expected requirements are not met, D₂₁＝50。

2) Average load factor of engineering transformer

Calculating the average load factor mu of the engineering transformer_avg,tAnd evaluating the average load condition of the engineering transformer.

μ_avg,t＝P_avg,t/S_t

In the formula, mu_avg,tThe average load factor of the transformer is obtained; p_avg,tThe unit MW is the annual average load of the transformer; s_tThe rated capacity of the transformer is in MVA. After the transformer is put into operation for one year, evaluating the engineering operation effect according to the average load percentage interval of the transformer, and recording the evaluation result as D₂₂. When mu is_avg,tWhen the load is more than or equal to 50 percent, the engineering transformer is considered to be overloaded for a long time, the operation effect does not meet the expected requirement, and D₂₂50; when mu is_avg,tBetween 25% and 50%, considering that the engineering transformer has reasonable load condition, the engineering operation effect meets the expected requirement, D₂₂100; when mu is_avg,tWhen the load is less than or equal to 25 percent, the engineering transformer is considered to be light-load, the operation effect does not meet the expected requirement, and D₂₂＝50。

3) Line maximum load rate

Calculating the maximum load rate mu of the line_max,1And evaluating the maximum load condition of the engineering line.

μ_max,1＝P_max,1/S₁

In the formula, mu_max,1The maximum load rate of the line; p_max,lThe maximum load of the line, unit MW; s_lFor line rated capacity, in MVA. After the line is put into operation for one year, evaluating the engineering operation according to the percentage interval of the maximum load rate of the lineEffect, evaluation results are denoted by D₂₃. When mu is_max,1When the maximum load rate of the regional power grid line is more than 60% of the average value of the maximum load rates of the regional power grid line with the same voltage class, the maximum load condition of the engineering line is considered to basically achieve the planning target, the line type selection is reasonable, the engineering operation effect is considered to meet the expected requirement, and D₂₃100; otherwise, the engineering operation effect is considered to be not in accordance with the expected requirement, D₂₃＝50。

4) Average load factor of line

Calculating the average load factor mu of the line_avg,1And evaluating the average load condition of the engineering line.

μ_avg,1＝P_avg,1/S₁

In the formula, mu_avg,1Is the average load rate of the line; p_avg,lThe annual average load of the line; s_lIs the rated capacity of the line. And after the line is put into operation for one year, evaluating the engineering operation effect according to the line average load percentage interval, and recording the evaluation result as D₂₄. When mu is_avg,lWhen the average load rate of the regional power grid line is more than 60 percent of the average load rate of the regional power grid line with the same voltage level, the average load condition of the engineering line is considered to basically achieve the planning target, the line type selection is reasonable, the engineering operation effect is considered to meet the expected requirement, and D₂₄100; otherwise, the engineering operation effect is considered to be not in accordance with the expected requirement, D₂₄＝50。

5) Overhead line loss

Calculating overhead line loss Q_l,lAnd evaluating the reasonability of the overhead line loss.

Q_l.l＝Q_in-Q_out

In the formula, Q_l,lUnit MWh; q_inInputting electric quantity for the transformer in unit of MWh; q_outThe output electric quantity of the transformer is unit MWh. Evaluating the engineering operation effect according to the overhead line loss, and recording the evaluation result as D₂₅. When Q is_l,lWhen the average loss of the overhead line is less than or equal to the average loss of the overhead line with the same voltage class, considering that the loss of the overhead line is reasonable, and the engineering operation effect meets the expected requirement, D₂₅100; when Q is_l,lWhen the average loss is larger than that of the overhead line with the same voltage class, the average loss is consideredSevere overhead line losses, unsatisfactory engineering performance, D₂₅＝50。

6) Main transformer loss

Calculating main transformer loss Q_l,tAnd evaluating the rationality of the main transformer loss.

Q_l.t＝Q_in-Q_out

In the formula, Q_l,tThe unit MWh is the main transformer loss; q_inInputting electric quantity for the transformer in unit of MWh; q_outThe output electric quantity of the transformer is unit MWh. Evaluating the engineering operation effect according to the main transformer loss, and recording the evaluation result as D₂₆. When Q is_l,tWhen the average loss of the transformer with the same voltage grade and the same capacity is less than or equal to the average loss of the transformer with the same voltage grade and the same capacity, the main transformer loss is considered to be reasonable, and D₂₆100; when Q is_l,tWhen the average loss of the transformer with the same voltage class and the same capacity is larger than the average loss of the transformer with the same voltage class, the main transformer loss is considered to be serious, D₂₆＝50。

7) Electric quantity for accessing internet

Calculating the internet surfing electric quantity Q obtained from a power supply after the project is put into operation_upAnd evaluating the direct effect of ensuring the power supply sending engineering to play.

Q_upUnit MWh. Evaluating the engineering operation effect according to the online electric quantity, and recording the evaluation result as D₂₇. When Q is_upWhen the same voltage level or more ensures that the power supply sends out the average on-line electric quantity of the project, the on-line electric quantity is considered reasonable, the project operation effect meets the expected requirement, D₂₇100; when Q is_upWhen the average on-line electric quantity of the project is less than the guaranteed power supply with the same voltage level, the on-line electric quantity is considered to be low, the project operation effect does not meet the expected requirement, and D₂₇＝50。

8) Power factor at time of maximum load

Calculating the power factor at the moment of maximum load

Evaluating whether project capacitive reactive configuration is sufficient:

in the formula, S is the apparent power transmitted by the device at the time of maximum load, and the unit is MVA, P is the active power transmitted by the device at the time of maximum load, and the unit is MW, Q is the reactive power transmitted by the device at the time of maximum load, and the unit is MVar.

And evaluating the engineering operation effect according to the power factor at the maximum load moment, and recording the evaluation result as D₂₈. When in use

When the reactive power is more than or equal to 0.95, the project capacitive reactive power configuration is enough, the contribution to reducing the power grid loss and improving the power quality is obvious, the engineering operation effect meets the expected requirement, and D₂₈100; when in use

When the reactive configuration is less than 0.95, the project capacitive reactive configuration or the actual investment is not enough, the regulation requirement is not met, the engineering operation effect does not meet the expected requirement, and D₂₈＝50。

9) Power factor at minimum load moment

Calculating the power factor at the moment of minimum load

Evaluating whether the project inductive reactive configuration is sufficient:

in the formula, S is the apparent power transmitted by the minimum load time device, and the unit is MVA, P is the active power transmitted by the minimum load time device, and the unit is MW, Q is the reactive power transmitted by the minimum load time device, and the unit is MVar.

And evaluating the engineering operation effect according to the power factor at the minimum load moment, and recording the evaluation result as D₂₉When is coming into contact with

When the value is between 0.92 and 0.95, the inductive reactive power configuration of the project is reasonable, the operation switching is timely, the engineering operation effect meets the expected requirement, and D₂₉100; when in use

When the configuration capacity of the project reactive compensation device is less than 0.92 or more than 0.95, the project reactive compensation device is considered to be unreasonable in configuration capacity or not timely in switching, the regulation requirement is not met, the project operation effect does not meet the expected requirement, and D₂₉＝50。

10) Number of times of influencing electric energy quality examination

And calculating the times J of influencing the electric energy quality assessment, and evaluating the influence of a power supply on the electric energy quality.

Evaluating the engineering operation effect according to the times of influencing the electric energy quality examination, and recording the evaluation result as D₂₀. When J is 0 times, the influence of the traction station on the power quality is considered to be well controlled, and D₂₀100; when J is not 0, the influence of the traction station on the electric energy quality is considered to be serious, the engineering operation effect does not meet the expected requirement, and D₂₀＝50。

11) Determination of project effect evaluation index weight

The invention adopts the weight solving algorithm of subjective and objective weight combination based on the index classification reference comparison method to solve the index weight determination, and can determine a₂₀、a₂₁、a₂₂、a₂₃、a₂₄、a₂₅、a₂₆、a₂₇、a₂₈、a₂₉Wherein, a₂₀、a₂₁、a₂₂、a₂₃、a₂₄、a₂₅、a₂₆、a₂₇、a₂₈、a₂₉The evaluation method comprises the steps of respectively weighing 10 indexes of the number of times of influencing electric energy quality examination, the maximum load rate of the engineering transformer, the average load rate of the engineering transformer, the maximum load rate of a line, the average load rate of the line, the loss of an overhead line, the loss of a main transformer, the quantity of network electricity, the power factor at the moment of maximum load and the power factor at the moment of minimum load in effect evaluation, and

a₂₀+a₂₁+a₂₂+a₂₃+a₂₄+a₂₅+a₂₆+a₂₇+a₂₈+a₂₉＝1。

evaluating whether the actual effect of the operation of the project on the aspect of guaranteeing the power supply delivery meets the construction requirement according to the effect calculation result, wherein the evaluation result is D₂And (4) showing.

When the evaluation result D₂When the power supply is larger than or equal to 60, the actual function of the operation of the project in the aspect of power supply delivery is considered to meet the construction requirement; when the evaluation result D₂If < 60, the actual role of the operation of the project in the power supply delivery is considered to be not satisfied with the construction requirements.

4. Evaluating the project safety of the power supply transmission power grid project according to the collected power data, wherein the evaluation indexes of the project safety include line availability, bus voltage qualification rate, power grid safety accident occurrence frequency, relay protection and safety device misoperation and rejection frequency, line unplanned outage hours, line unplanned outage frequency, line trip-out rate and transformer unplanned outage time, and the specific evaluation process of each evaluation index on the project safety is as follows:

1) availability of lines

Calculating line availability A_LEvaluation of the ability of the line to last:

wherein u is the forced outage rate, unit times/year; t is_rThe mean time for repairing the fault is unit hour/time; t is_ΣAAccumulating the fault-free working time for the equipment in unit hour; t is_ΣTo accumulate commissioning time in hours. Evaluating the engineering safety reliability according to the availability of the line, and using D as the evaluation result₃₁Is shown when A_LWhen the average value of the availability of the same type of lines of regional power grids is more than or equal to the average value, the continuous use capability of the lines is considered to be good, the engineering safety and reliability are good, and D₃₁100; when A is_TWhen the average value of the availability of the same type of line of the regional power grid is less than the average value of the availability of the same type of line, the line is considered to have weaker continuous use capability, the engineering safety and reliability are unqualified, and D₃₁＝50。

2) Bus A-phase voltage qualification rate

Calculating the qualification rate eta of A-phase voltage of project bus_AAnd evaluating the voltage quality of the project:

η_A(％)＝(1-T_b/T_Σ)*100％

in the formula eta_AFor project bus A phase voltage qualification rate, T_bThe unit hour is the voltage out-of-limit accumulated time; t is_ΣThe statistical time is the total run of the project in hours.

Evaluating the engineering safety reliability according to the qualification rate of the A-phase voltage of the bus, and recording the evaluation result as D₃₂. When eta_AWhen the voltage is more than or equal to 99.99 percent, the project bus voltage qualification rate is considered to be good, the engineering safety and reliability are excellent, and D₃₂100; when eta_AWhen the voltage is between 99.95 and 99.99 percent, the voltage qualification rate of the project bus is considered to be qualified, the engineering safety and reliability are considered to be excellent, and D₃₂100; when eta_AWhen the voltage is less than or equal to 99.95 percent, the project bus voltage qualification rate is considered to be low, the engineering safety and reliability are unqualified, D₃₂＝50。

3) Number of occurrence of power grid safety accidents

Counting the occurrence frequency J of the grid safety accident_aEvaluating project safetyAnd (4) running horizontally.

Evaluating the engineering safety reliability according to the occurrence frequency of the power grid safety accidents, and recording the evaluation result as D₃₃. Compared with the regulations for emergency handling and investigation handling of electric power safety accidents, when no safety accident occurs in a project, the project is considered to have no influence on the safety of a power grid, the engineering safety and reliability are excellent, and D₃₃100; when the accident below the common accident happens to the project, the project is considered to form certain threat to the safe operation of the power grid, the engineering safety and reliability are excellent, and D₃₃70; when a particularly major accident, a major accident and a major accident occur, the project is considered to have serious damage to the safe operation of the power grid, the engineering safety and reliability are unqualified, and D₃₃＝0。

4) False operation and failure operation times of relay protection and safety device

Calculating the times J of false operation and refusal operation of relay protection and safety device in the project or safety device at other positions in the power grid caused by project operation_JAnd evaluating the accuracy of actions of the relay protection and stability device and the influence on the safe and stable operation of the power grid.

Evaluating the engineering safety reliability according to the misoperation and the failure times of the relay protection and stability device, and recording the evaluation result as D₃₄. When J is_JWhen the value is equal to 0, the project has no influence on the safe and stable operation of the power grid, the engineering safety and reliability are considered to be good, and D₃₄100; when J is_JWhen the value is more than or equal to 1, the condition that the project has large influence on the safe and stable operation of the power grid is shown, the engineering safety and reliability are considered to be unqualified, and D₃₄＝50。

5) Number of unplanned outage hours of line

Counting the number of unplanned outage hours sigma T of the line_d.lAnd evaluating the capability of the line to maintain safe and stable operation.

Evaluating the engineering safety reliability according to the unplanned outage hours of the line, and recording the evaluation result as D₃₅. When sigma T_d.lLess than the mean value of the unplanned shutdown time of the regional line, good capability of maintaining safe and stable operation of the project line, excellent engineering safety and reliability, D₃₅100; when sigma T_d.lThe mean value of the unplanned shutdown time of the regional line or more is considered as the poor capability of the project line for maintaining safe and stable operation, the engineering safety and reliability are unqualified, D₃₅＝50。

6) Frequency of unplanned outages of line

Statistical circuit unplanned outage frequency f_lAnd evaluating the capability of the line to maintain safe and stable operation.

Evaluating the engineering safety reliability according to the unplanned shutdown frequency of the line, and recording the evaluation result as D₃₆. When f is_lLess than the mean value of the unplanned shutdown frequency of the regional line, good capability of maintaining safe and stable operation of the project line, good engineering safety and reliability, D₃₆100; when f is_lThe mean frequency of unplanned shutdown of the regional lines or more is considered as the capacity of maintaining safe and stable operation of the project line is poor, the engineering safety and reliability are unqualified, D₃₆＝50。

7) Line trip rate

And calculating the tripping rate lambda caused by the external environment or insulation problem of the line operation, and evaluating the safe operation capacity of the line to the environmental change.

λ＝M/T

In the formula, lambda is the non-intrinsic tripping rate of the circuit, unit times/year; m is the total number of trips caused by the capacity or insulation problem of the line in the statistical period, and the unit is times; t is evaluation time in years. Evaluating the engineering safety reliability according to the line trip rate, and recording the evaluation result as D₃₇. When lambda is less than 1, the safe operation capability of the circuit for coping with environmental changes is considered to be good, the engineering safety and reliability are excellent, and D₃₇100; when lambda is between 1 and 3, the safe operation capability of the line for coping with environmental change is considered to be general, the engineering safety and reliability are excellent, and D₃₇100; when the lambda is more than or equal to 3, the safe operation capability of the line for coping with the environmental change is considered to be poor, the engineering safety reliability is unqualified, and D₃₇＝50。

8) Unplanned downtime of transformer

Statistics of unplanned transformer outage time sigma T_d.tEvaluation of Transformer protectionThe capability of safe and stable operation is maintained.

Evaluating the engineering safety reliability according to the unplanned outage hours of the transformer, and recording the evaluation result as D₃₈. When sigma T_d.tLess than the mean value of the unplanned shutdown time of the regional transformer, good capability of maintaining safe and stable operation of the project transformer, excellent engineering safety and reliability, D₃₈100; when sigma T_d.tThe mean value of the unplanned shutdown time of the regional transformer is larger than or equal to the mean value of the unplanned shutdown time of the regional transformer, the project transformer is considered to have poor capability of maintaining safe and stable operation, the engineering safety and reliability are unqualified, D₃₈＝50。

9) Determination of project safety evaluation index weight

The method adopts a weight solving algorithm of subjective and objective weight combination based on an index classification reference comparison method to solve the index weight, and can obtain a₃₁、a₃₂、a₃₃、a₃₄、a₃₅、a₃₆、a₃₇、a₃₈A determined weight value, wherein₃₁、a₃₂、a₃₃、a₃₄、a₃₅、a₃₆、a₃₇、a₃₈Respectively weighing 8 indexes of line availability, bus voltage qualification rate, grid safety accident occurrence frequency, relay protection and safety device misoperation and failure frequency, line unplanned outage hours, line unplanned outage frequency, line trip-out rate and transformer unplanned outage time in safety evaluation, wherein a is the weight of the line availability, the bus voltage qualification rate, the grid safety accident occurrence frequency, the relay protection and safety device misoperation and failure frequency, the line unplanned outage hours, the line trip-out rate and the transformer unplanned outage time₃₁+a₃₂+a₃₃+a₃₄+a₃₅+a₃₆+a₃₇+a₃₈＝1。

Evaluating whether the engineering safety reliability is qualified according to the safety calculation result, wherein the evaluation result is D₃And (4) showing.

D₃＝a₃₁D₃₁+a₃₂D₃₂+a₃₃D₃₃+a₃₄D₃₄+a₃₅D₃₅+a₃₆D₃₆+a₃₇D₃₇+a₃₈D₃₈

When the evaluation result D₃When the reaction temperature is more than or equal to 60 ℃, the process is consideredThe operation of the process meets the basic requirements of power grid engineering in the aspect of safety and reliability; when the evaluation result D₃When the time is less than 60, the operation of the project is considered to be not in accordance with the basic requirements of the power grid project in terms of safety and reliability.

5. And comprehensively evaluating the operation effect of the power supply transmission power grid project by comprehensively considering the project efficiency, the project effect and the project safety.

D＝a₁D₁+a₂D₂+a₃D₃

wherein, a₁、a₂、a₃Respectively is efficacy D₁Effect D₂Safety D₃And define a₁+a₂+a₃And (4) solving by adopting a weight solving algorithm of subjective and objective weight combination based on an index classification reference comparison method, wherein the weight solving algorithm is 1.

2) Determination of D₁、D₂、D₃Comment level discourse

for safety D₃Evaluation determination of discourse Domain as d₃＝{d₃₁,d₃₂In which d is₃₁Represents pass, d₃₂Indicating a failure.

And converting the qualitative evaluation into numerical values, and obtaining the numerical values respectively by the equivalent values corresponding to the three types of membership conversion. To pull the score span between different qualitative judgments, the following three sets of score correspondences are set:

substituting the comprehensive evaluation formula D ═ a₁D₁+a₂D₂+a₃D₃

When D is less than 60, the whole operation effect of the project as a power supply to be sent out of the power grid project is considered to be poor, and the project should be carried out according to the efficiency D₁Effect D₂Safety D₃Specifically analyzing the reason of poor operation effect and developing targeted improvement measures.

When D is more than or equal to 60 and less than 80, the project is considered to have good overall operation effect as a power supply sending power grid project and certain safety and stability, the construction of the project has the function of guaranteeing the power supply sending, and the function of guaranteeing the power supply sending is realized to a certain extent in the operation of the project. Should be based on efficacy D₁Effect D₂Safety D₃The evaluation result of (2) specifically analyzes the problems existing in the aspect of operation effect, and develops targeted improvement measures.

When D is larger than or equal to 80, the project is considered to have good overall operation effect as a power supply transmission power grid project, and has better safety and stability, the construction of the project effectively ensures the capability of transmitting a large amount of power supply power, and the operation of the project fully realizes the function of transmitting the power supply.

In the above embodiment, in order to accurately and comprehensively describe the importance of the evaluation index quantitatively, improve the subjective weight calculation process based on the preference index of the decision maker in the decision logic process in the conventional evaluation method, and according to the first impression effect in decision center, the invention provides a weight solving algorithm of subjective and objective weight combination based on an index classification reference comparison method for solving, the subjective weight is determined by the expert experience preference, objective data analysis uses various classical data analysis and evaluation, the combination weight considering the evaluation data characteristics is obtained by normalization formula processing, and the determination of reasonable weight value under the evaluation of index number within 20 can be realized, and the specific principle is as follows:

as shown in fig. 2, assuming that the samples to be evaluated have i indexes x whose weights need to be determined and j indexes x,j is not greater than 20, and the evaluated weight vector is W ═ W₁,w₂...,w_j]^TThe specific process for solving the evaluation weight W is as follows:

1) preprocessing the index data, specifically:

1.1) eliminating index abnormal points, specifically adopting the index deviation average value plus two times of standard deviation mu +2 sigma as a sample x for judging whether the index value is abnormal or not_outlierThe standard of (2).

In the formula, μ represents a sample mean value, and σ represents a sample standard deviation.

1.2) index reconciliation treatment

According to the comprehensive evaluation theory, the indexes may belong to three types: "very Large" index X_maxThe "centered" index X_mid"ultra small" index X_min. In order to make the evaluation result comparable, firstly, the mathematical change is performed on the index, namely the index is subjected to the consistency processing, and specifically, the method comprises the following steps:

(1) if X belongs to the extremely small index, taking the reciprocal of the index X as the value e for the coincidence:

(2) if X belongs to the middle type index, taking the comparison result of the index X and the maximum value U and the minimum value U of the optimal range as a consistent value e:

1.3) dimensionless of the index

If the dimensions and the magnitude orders of a plurality of evaluation indexes are different, the indexes need to be subjected to mathematical transformation treatment firstly, so that the indexes are subjected to non-dimensionalization and then are evaluated continuously, and the method specifically comprises the following steps:

in the formula, x_ijValue of j index representing ith sample, M_j＝max{x_ij}，m_j＝min{x_ij}，e_ij∈[0,1]. If the index value is a fixed value, the index needs to be removed.

2) Calculating subjective weight based on preference information of a decision maker, and solving the subjective weight based on ICRC; the classification stage and the reference comparison stage form a solving framework of the weight subjective experience decision.

2.1) index Classification

According to the primary classification index of expert experience, j evaluation indexes chi are set₁,χ₂,......,χ_jAccording to expert's experience, the index χ under the same criterion_kAnd classifying the data into four different importance levels: core level S₁Supporting level S₂Base level S₃Weakly associated hierarchy S₄：

S_i∈χ_k

According to the significance and the distribution characteristics of the importance degree of each level, the classification principle is defined as follows:

classification principle 1: corresponds to S₁、S₂、S₃、S₄The number ratio of the distribution indexes is as follows:

above formula b₁Representing that the core layer covers 20% of the index, b₂Representing an index covering 30% of the supporting layer, b₃Index representing 40% coverage of the base layer, b₄The number of layers representing weak association is 10% of the total index.

Classification principle 2: corresponds to S₁、S₂、S₃、S₄The weights of the four levels are:

the importance degree p of the core layer index is represented in the formula₁The weight of the criterion, θ, which can be expressed as 40%, the degree of importance of the support layer index, p₂The criterion weight, which can be expressed as 30%, the importance level p of the base layer index₃The weight of the criterion, which can be expressed as 20%, the degree of importance p of the weakly associated layer indicator₄This criterion weight can be expressed as 10%.

2.2) reference comparison

According to expert experience, respectively selecting one most important index from four levels as a reference index chi_{Reference to}The importance of the reference index can be used as a judgment criterion for determining the weight, namely, the rest indexes and the reference index are compared and scored pairwise, the index score values are summed according to lines to obtain the score sum of each index, and finally, the weighted average processing is carried out to obtain the subjective weight coefficient v of the index_k。

After grading, the standard index χ_{Reference to}Relative comparative score set as m_k，

m_k＝χ_k/χ_{Reference to}

Wherein the score m_kThe scoring criteria are as follows:

TABLE 1 RC method score table

Of importance	Of greater importance	Of less importance	Is less important than
				0.9	0.6	0.3	0.1

Obtaining an evaluation vector:

α_i＝[m₁...,m_k,...]^T

calculating the weight value theta after the grading is finished_iIs S_iThe sum of the assigned weights, p_iIs S_iAssigned weight percentage, define k 1, if S_i∈χ_kCorresponding score value m_k，ν_kSubjective weighting factor:

the obtained subjective weights are: v ═ V₁,ν₂...,ν_j]^T。

3) And calculating the objective weight based on the evaluation data, namely calculating the values of the index variance, the information entropy and the grey correlation degree, and obtaining the objective weight through weighted average.

(1) Calculating the index variance:

wherein μ represents a sample subscript, k represents an index subscript, e_μkValue representing the kth index of the μ th sample

(2) Calculating index information entropy:

(3) calculating the grey correlation degree of the index:

Δ_k(q)＝|X₀(q)-X_k(q)|

in the formula, k represents index subscript, X₀(q) is an index value of the reference number series, ξ_kThe term (q) denotes a correlation coefficient, and ρ denotes a resolution coefficient, and ρ is usually 0.5.

Comparing the degree of relatedness of a sequence to a reference sequence

Values are generally expressed as averages, i.e.:

(5) weighted average integration of objective weights:

the objective weights obtained were: f ═ F₁,f₂...,f_j]^T。

4) The subjective and objective weight combination based on the normalization formula comprises the following specific processes:

4.1) normalization formula calculates the combining weight:

obtaining a weight vector of W ═ W₁,w₂...,w_j]^T。

Example 2

Based on the same invention concept, the invention also provides a power supply transmission power grid engineering operation benefit evaluation system, which is characterized by comprising:

the data acquisition module is used for acquiring power data of the power supply to be evaluated, which is sent out of the actual operation of the power grid project;

the project efficiency evaluation module is used for evaluating the project efficiency of the power supply transmission power grid project according to the collected power data;

the project effect evaluation module is used for evaluating the project effect of the power supply transmitted to the power grid project according to the collected power data;

the project safety evaluation module is used for evaluating the project safety of the power supply transmission power grid project according to the collected power data;

and the comprehensive evaluation module is used for comprehensively evaluating the operation benefit of the power supply transmission power grid project according to the evaluation results of the project efficiency, the project effect and the project safety.

As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.

The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks. The above embodiments are only used for illustrating the present invention, and the implementation steps of the method and the like can be changed, and all equivalent changes and modifications based on the technical scheme of the present invention should not be excluded from the protection scope of the present invention.

Claims

1. A power supply transmission power grid project operation benefit evaluation method is characterized by comprising the following steps:

collecting power data which are sent by a power supply to be evaluated to the actual operation of a power grid project;

evaluating the project efficiency of the power supply sending out of the power grid project according to the collected power data, wherein the project efficiency evaluation indexes comprise newly increased line quantity system occupation ratio, newly increased line length system occupation ratio, newly increased unit capacity system occupation ratio and buckle current check, and the specific evaluation process comprises the following steps:

system proportion K for calculating number of newly added lines_l1：K_l1＝C_l/ΣC_lIn the formula, Σ C_lFor the number of lines of the same voltage class of the system before commissioning, C_lAdding new circuit number for the projectAccording to K_l1Evaluating the engineering importance, and recording the evaluation result as D₁₁The degree of importance of the construction of the project to the power grid project for power supply delivery is D₁₁Setting the value of (c);

calculating the proportion K of the newly added line length to the total line length of the system_l2：K_l2＝L_l/∑L_lIn the formula, Σ L_lThe length of the same voltage class line of the system before commissioning, L_lAdding new line length for the project according to K_l2Evaluating the engineering importance, and recording the evaluation result as D₁₂The degree of importance of the construction of the project to the power grid project for power supply delivery is D₁₂Setting the value of (c);

calculating the proportion K of newly-accessed installed capacity in engineering to installed capacity of system before operation_g，K_g＝S_g/ΣS_gIn the formula, Σ S_gFor the pre-commissioning system installed capacity, S_gNew access to installed capacity for this project, according to K_gEvaluating the engineering importance, and recording the evaluation result as D₁₃The degree of importance of the construction of the project to the power grid project for power supply delivery is D₁₃Setting the value of (c);

calculating the ratio R of the actual line running current to the line bayonet current_ab，R_ab＝C_a/C_bIn the formula, C_aFor line running of actual current, C_bFor line-card current, according to R_abThe importance of the project was evaluated, and the evaluation result was denoted as D₁₄The degree of importance of the construction of the project to the power grid project for power supply delivery is D₁₄Setting the value of (c);

calculating D from the above results₁：D₁＝a₁₁D₁₁+a₁₂D₁₂+a₁₃D₁₃+a₁₄D₁₄According to D₁Evaluating whether the construction of the project has significant capability of power supply delivery, wherein a₁₁、a₁₂、a₁₃、a₁₄Respectively checking the system occupation ratio, the system occupation ratio of the length of the newly added line, the system occupation ratio of the capacity of the newly added unit and the buckle current in the efficiency evaluationWeight, a₁₁+a₁₂+a₁₃+a₁₄1 according to D₁Evaluating the capacity of the construction of the project for power supply delivery according to the comparison result with the preset value;

evaluating the project effect of the power supply transmission power grid project according to the collected power data, wherein the project effect evaluation indexes comprise the maximum load rate of the engineering transformer, the average load rate of the engineering transformer, the maximum load rate of a line, the average load rate of the line, the loss of an overhead line, the loss of a main transformer, the power of the internet, the power factor at the moment of maximum load, the power factor at the moment of minimum load and the number of times of influencing the quality of electric energy examination, and the specific evaluation process comprises the following steps:

calculating the maximum load rate mu of the line_max,1：μ_max,1＝P_max,1/S₁In the formula, mu_max,1The maximum load rate of the line; p_max,lFor the maximum load on the line, S_lFor rating the line, lineAfter the set time limit of commissioning, evaluating the engineering operation effect according to the section of the maximum load rate of the line, and recording the evaluation result as D₂₃According to whether the engineering operation effect reaches the expected pair D₂₃Setting the value of (c);

calculating the power factor at the moment of maximum load

calculating the power factor at the moment of minimum load

calculating D from the above index₂According to D₂And evaluating the engineering effect with the comparison result of the preset threshold:

wherein, a₂₀、a₂₁、a₂₂、a₂₃、a₂₄、a₂₅、a₂₆、a₂₇、a₂₈、a₂₉Respectively the weight of 10 indexes of the number of times of checking the quality of the electric energy, the maximum load rate of the engineering transformer, the average load rate of the engineering transformer, the maximum load rate of a line, the average load rate of the line, the loss of an overhead line, the loss of a main transformer, the quantity of the on-grid electricity, the power factor at the moment of the maximum load and the power factor at the moment of the minimum load in effect evaluation, a₂₀+a₂₁+a₂₂+a₂₃+a₂₄+a₂₅+a₂₆+a₂₇+a₂₈+a₂₉＝1；

Evaluating the project safety of the power supply transmission power grid project according to the collected power data, wherein the evaluation indexes of the project safety include line availability, bus voltage qualification rate, power grid safety accident occurrence frequency, misoperation and operation rejection frequency of a relay protection and stability device, unplanned line outage hours, unplanned line outage frequency, line trip-out rate and unplanned transformer outage time, and the specific process is as follows:

calculating line availability A_L：

statistics of unplanned transformer outage time sigma T_d.tEvaluating the engineering safety reliability according to the unplanned outage hours of the transformer, and recording the evaluation result as D₃₈According to the degree of engineering safety reliability, pair D₃₈Determining the value of (c);

evaluating engineering safety according to the above indexes, and using D as evaluation result₃Represents: d₃＝a₃₁D₃₁+a₃₂D₃₂+a₃₃D₃₃+a₃₄D₃₄+a₃₅D₃₅+a₃₆D₃₆+a₃₇D₃₇+a₃₈D₃₈Wherein a is₃₁、a₃₂、a₃₃、a₃₄、a₃₅、a₃₆、a₃₇、a₃₈Respectively the line availability, the bus voltage qualification rate, the grid safety accident occurrence frequency, the misoperation and failure frequency of the relay protection and safety device, the unplanned line outage hours, the unplanned line outage frequency, the line trip-out rate and the unplanned transformer outage time in the efficiency evaluation, a₃₁+a₃₂+a₃₃+a₃₄+a₃₅+a₃₆+a₃₇+a₃₈1 is ═ 1; according to D₃Evaluating whether the engineering safety reliability is qualified or not according to a comparison result with a preset value;

according to the evaluation results of project efficiency, project effect and project safety, the operation benefit of the power supply transmission power grid project is comprehensively evaluated, and the specific process is as follows:

D＝a₁D₁+a₂D₂+a₃D₃

2. The power delivery grid project operation benefit evaluation method of claim 1, wherein a is₁、a₂、a₃And solving by adopting a weight solving algorithm of subjective and objective weight combination of an index classification reference comparison method.

3. The power grid project operation benefit evaluation method of claim 1, wherein before calculating the operation effect comprehensive evaluation value D, further comprising:

determination of D₁、D₂、D₃Comment level domain;

the above qualitative evaluations were converted into numerical values.

4. A power supply transmission power grid engineering operation benefit evaluation system is characterized by comprising:

the project efficiency evaluation module is used for evaluating the project efficiency of the power supply sending power grid project according to the collected power data, wherein the project efficiency evaluation indexes comprise a newly added line quantity system occupation ratio, a newly added line length system occupation ratio, a newly added unit capacity system occupation ratio and buckle current verification; the specific evaluation process comprises the following steps:

system proportion K for calculating number of newly added lines_l1：K_l1＝C_l/ΣC_lIn the formula, Σ C_lFor the number of lines of the same voltage class of the system before commissioning, C_lAdding new lines to the project according to K_l1Evaluating the engineering importance, and recording the evaluation result as D₁₁The degree of importance of the construction of the project to the power grid project for power supply delivery is D₁₁Setting the value of (c);

calculating the ratio R of the actual line running current to the line bayonet current_ab，R_ab＝C_a/C_bIn the formula, C_aFor line running of actual current, C_bFor line-card current, according to R_abThe importance of the project was evaluated, and the evaluation result was denoted as D₁₄The degree of importance of the construction of the project to the power grid project for power supply delivery is D₁₄Is proceeding withSetting;

calculating D from the above results₁：D₁＝a₁₁D₁₁+a₁₂D₁₂+a₁₃D₁₃+a₁₄D₁₄According to D₁Evaluating whether the construction of the project has significant capability of power supply delivery, wherein a₁₁、a₁₂、a₁₃、a₁₄Respectively verifying the weights of the system proportion, the system proportion of the length of the newly added line, the system proportion of the capacity of the newly added unit and the buckle current in the efficiency evaluation, a₁₁+a₁₂+a₁₃+a₁₄1 according to D₁Evaluating the capacity of the construction of the project for power supply delivery according to the comparison result with the preset value;

the project effect evaluation module is used for evaluating the project effect of the power supply transmission power grid project according to the collected power data, wherein the project effect evaluation indexes comprise the maximum load rate of an engineering transformer, the average load rate of the engineering transformer, the maximum load rate of a line, the average load rate of the line, the loss of an overhead line, the loss of a main transformer, the power of the internet, the power factor at the maximum load moment, the power factor at the minimum load moment and the number of times of influencing power quality examination, and the specific process is as follows:

calculating the average load factor mu of the engineering transformer_avg,t：μ_avg,t＝P_avg,t/S_tIn the formula, mu_avg,tThe average load factor of the transformer is obtained; p_avg,tFor the annual average load of the transformer，S_tSetting the age limit time for rated capacity of the transformer and operation of the transformer, evaluating the engineering operation effect according to the interval of the average load rate of the transformer, and recording the evaluation result as D₂₂According to whether the engineering operation effect reaches the expected pair D₂₂Setting the value of (c);

calculating the maximum load rate mu of the line_max,1：μ_max,1＝P_max,1/S₁In the formula, mu_max,1The maximum load rate of the line; p_max,lFor the maximum load on the line, S_lEvaluating the engineering operation effect according to the interval of the maximum load rate of the line after the line is put into operation for setting the age limit for the rated capacity of the line, and recording the evaluation result as D₂₃According to whether the engineering operation effect reaches the expected pair D₂₃Setting the value of (c);

calculating main transformer loss Q_l,t，Q_l.t＝Q_in-Q_outIn the formula, Q_l,tFor main transformer losses, Q_inFor input of electric power, Q, to the transformer_outFor the transformer output electric quantity, the engineering operation effect is evaluated according to the main transformer loss, and the evaluation result is recorded as D₂According to whether the engineering operation effect reaches the expected pair D₂₆Is set toPlacing;

calculating the power factor at the moment of maximum load

calculating the power factor at the moment of minimum load

Where S is the apparent power delivered by the device at the moment of minimum load and P is the apparent power delivered by the device at the moment of minimum loadActive power, Q is reactive power transmitted by equipment at the moment of minimum load, engineering operation effect evaluation is carried out according to the power factor at the moment of minimum load, and the evaluation result is recorded as D₂₉According to whether the engineering operation effect reaches the expected pair D₂₉Setting the value of (c);

The project safety evaluation module is used for evaluating the project safety of the power supply transmission power grid project according to the collected power data, wherein the evaluation indexes of the project safety include the line availability, the bus voltage qualification rate, the occurrence frequency of power grid safety accidents, the misoperation and the operation rejection frequency of a relay protection and safety device, the unplanned outage hours of the line, the unplanned outage frequency of the line and the trip rate of the line, and the specific process is as follows:

calculating line availability A_L：

statistical circuit unplanned outage frequency f_lEvaluating the engineering safety reliability according to the unplanned shutdown frequency of the line, and recording the evaluation result as D₃₆According to the engineering safetyDegree of reliability pair D₃₆Determining a value;

the comprehensive evaluation module is used for comprehensively evaluating the operation benefit of the power supply transmission power grid project according to the evaluation results of the project efficiency, the project effect and the project safety, and the specific process is as follows:

D＝a₁D₁+a₂D₂+a₃D₃