CN109816269B - Power distribution network project planning method based on comprehensive benefits of power distribution units - Google Patents
Power distribution network project planning method based on comprehensive benefits of power distribution units Download PDFInfo
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Abstract
The invention belongs to the technical field of power distribution network planning methods, and relates to a power distribution network project planning method based on comprehensive benefits of power distribution units. The method comprises the basic steps of dividing power distribution units, establishing an evaluation system based on the power distribution units, uniformly converting the current state level of each index into a score under a percentage system, constructing a fuzzy judgment matrix, assigning and calculating each weight coefficient, setting interval coefficients, calculating the comprehensive adjustment score of the power distribution units and counting and sequencing.
Description
Technical Field
The invention belongs to the technical field of power distribution network planning methods, and particularly relates to a power distribution network project planning method based on comprehensive benefits of power distribution units.
Background
Electric power is an important component of energy, and with the continuous improvement of the degree of electrification, the electric power becomes the basic guarantee of the current social development and the life of people, and a power distribution network directly faces a terminal user and is a key link of an electric power system.
The power enterprise researches and summarizes a set of mature unit system power distribution network planning system in the aspect of power distribution network construction. However, after the construction fund of the power distribution network is released, in the face of investment of the power distribution network which is invested in a large amount, how to determine the investment strategy of the power distribution network, how to solve the difficult problem of the power distribution network in the aspect of project planning, how to resist the risk of investment, how to pay attention to economic benefits while considering the investment social benefits of the power distribution network, and the problem that power enterprises need to solve urgently is solved. In general, the management unit of power distribution network construction is a power saving company, and the implementation unit is a city power supply company. The conventional flow is as follows: the provincial power company plans the overall investment scale of the provincial power distribution network, and globally considers the investment demand conditions reported by each subordinate unit to carry out fund distribution; and arranging a power grid investment plan by the power supply company in the city according to the capital divided by the provincial power company. Conventional project planning suffers from the following disadvantages:
1. the fund distribution decision-making lacks a unified standard, and the investment scale of lower-level units is often divided according to the current distribution network scale of the region and the social and economic development situation, so that the actual requirements of the construction of the distribution network of the region are difficult to meet, and the construction level difference of the distribution network between regions is easy to be larger and larger.
2. A lower-level power supply company lacks a scientific and effective project demand analysis method, the importance degree of different projects cannot be quantized, and the priority of power distribution network construction is difficult to put forward.
3. The primary power supply company lacks a comprehensive analysis method for the investment benefits of the power distribution network, and is difficult to systematically analyze and quantify the comprehensive benefits of project investment.
Disclosure of Invention
The power distribution network project planning evaluation system based on the comprehensive benefits of the power distribution units is provided, the comprehensive benefits of various power distribution planning projects can be subjected to correlation analysis and rapid processing after quantitative values are formed, and reference data can be provided for complex data analysis work such as power distribution network project planning, benefit evaluation and the like scientifically and effectively.
In order to achieve the purpose, the invention adopts the following technical scheme.
A power distribution network project planning method based on comprehensive benefits of power distribution units comprises the following steps:
step one, completing the division of power distribution units; comprises A1-A3;
A1. dividing the power distribution network jurisdiction range into a plurality of power distribution units, namely dividing the power distribution units one by one on the basis of planning of power distribution partitions of the power distribution network and on the basis of limiting conditions that municipal partitions are not crossed and control rule boundaries are not crossed;
A2. the method comprises the following steps of (1) defining the attribute of each power distribution unit according to the actual situation of each power distribution unit, wherein the attribute of each power distribution unit comprises a power supply partition type and function positioning;
A3. classifying items in a power distribution network planning item library according to power distribution units, and packaging items belonging to the same power distribution unit to the power distribution unit;
step two, establishing an evaluation system based on a power distribution unit; the evaluation system comprises a development level index group and an input-output index group, wherein the development level index group comprises B1-B2:
B1. the development level index group comprises a line average power supply number index, a line standard wiring proportion index, a line N-1 passing rate index, a line heavy load index, an overhead line insulation rate index, an old line index, a line section reasonable rate index, a line length overrun index, a line section standardization rate index, a line operation balance degree index, a load development saturation degree index, an openable capacity proportion index and a user access convenience degree index;
B2. an input-output evaluation index group, which comprises a technical improvement index, a construction direction index and an economic benefit index;
setting different target values for the power distribution unit according to power supply subareas or function positioning, uniformly converting the indexes of different dimensions into specific numerical values by a normalization method according to the difference between the current values and the target values of all indexes in the development level index group, and uniformly converting the current levels of all indexes in the development level index group into scores in percentage; the paint specifically comprises C1-C2: c1, according to the index meaning, classifying the attributes of each index in the development level index group of the power distribution unit, wherein the attributes are divided into a forward index attribute and a reverse index attribute, the forward attribute index y means that the higher the value of the index is, the better the value is, and the ideal value is 1;
the reverse attribute index is that the lower the value is, the better the value is, the ideal value is 0, and for different index attributes, the index score calculation formula is as follows:
the forward direction index is as follows:
reverse indexes are as follows:
in the formula: x is the current state value of the evaluation index, and y is the score of the evaluation index; for the forward or reverse indexes, a is the lower index limit; b is an index upper limit, namely a target value;
C2. calculating the difference ratio of each index of the input-output evaluation index group according to the index meaning, wherein the difference ratio is the percentage of the improvement degree of each index of the input-output evaluation index group in the improvement space of the index after investment implementation;
the forward index calculation method comprises the following steps: when the specific characteristic index is a forward index, the ideal index value of each region is 100, and n is set1And n2The index values before and after implementation are respectively, the normalization coefficient is 1/(100-n)1) And the actual improvement value of the index is related to the change of the index value, the calculation formula of the specific characteristic index improvement effect index value y is shown in the following formula:
the reverse index calculation method comprises the following steps: when the specific characteristic index is a reverse index, the ideal value of the index is 0, and n is set1And n2The index values before and after implementation are respectively, the normalization coefficient is 1/n1Similarly, the calculation formula of the specific characteristic index improvement effect index value y can be found in the following formula:
step four, constructing a fuzzy judgment matrix and assigning values; respectively calculating the weight coefficients of all indexes in each index group, specifically comprising D1-D2;
D1. constructing a weight modeling fuzzy judgment matrix of each index and assigning values;
D2. calculating weights by a geometric mean method, specifically, calculating the geometric mean of indexes required in the development level of the power distribution unit and required outside the development level of the power distribution unit respectively based on the fuzzy judgment matrix and the assignment thereof, multiplying and developing each element by row to obtain the geometric mean of each row of elements, and normalizing to obtain the weight coefficient of each index;
step five, setting interval coefficients, calculating comprehensive adjustment scores of the power distribution unit, specifically setting the interval coefficients after the weights are reset, calculating the comprehensive adjustment scores of the power distribution unit, wherein the adjustment score calculation function is as follows:
yi＝(k1i×ai+k2i×bi)/2；
in the formula: a is aiEvaluating scores for the development level of the distribution network of the ith distribution unit; k is a radical of formula1iEvaluating and adjusting the coefficient for the development level of the distribution network of the ith distribution unit, wherein the coefficient is an excitation factor when the coefficient is greater than 1, and the coefficient is a health-care factor otherwise; biEvaluating scores for input and output of the distribution network of the ith distribution unit; k is a radical of2iThe input and output evaluation adjustment coefficient of the distribution network of the ith distribution unit is an excitation factor when the input and output evaluation adjustment coefficient is greater than 1, and otherwise, the input and output evaluation adjustment coefficient is a health-care factor; the development level evaluation factors are:
the input-output evaluation factors are as follows:
and step six, respectively calculating the comprehensive adjustment scores of the power distribution units for different planning area schemes according to the step three to the step five, carrying out statistical sequencing on the comprehensive adjustment scores calculated by the planning schemes, judging the priority of the planning schemes according to the sequence from high to low, and indicating that the higher the score is, the higher the comprehensive benefit is.
In the above step, in particular, in the a1 step: for an uncontrolled area, dividing power distribution units according to a power distribution range of a main power distribution source point; each power distribution unit is provided with at least 2 main power supplies and comprises 1-3 groups of 10 kilovolt typical wirings, otherwise, similar or directly adjacent power distribution areas containing the minimum main power supplies are combined to be treated as a new power distribution unit; the power distribution area is composed of a plurality of adjacent land parcels with similar development degree and basically consistent power distribution reliability requirement.
In the above step, particularly, in the B1 step:
the average power number is a ratio of the total number of power supplies in the line to the total number of the line, wherein a tie line from different transformer substations is an additional power point, and the calculation formula is as follows:
the standard wiring proportion refers to the proportion of the lines adopting the standard wiring mode in the total lines, and the calculation formula is as follows:
the line N-1 passing rate refers to the rate of the line meeting the N-1 verification, and the line meeting the N-1 verification means that the normal power supply of the rest lines is not influenced when the line is in a fault or is scheduled to exit from operation; calculating the formula:
the line overloading rate is the ratio of the overloading line total number to the line total number, the overloading line is the line with the maximum overloading rate more than 80%, and the calculation formula is as follows:
the overhead line insulation rate is the proportion of the length of an overhead line insulation line in a power distribution unit to the total length of the overhead line of the power distribution unit, and a calculation formula is as follows:
the line old proportion refers to the proportion of the length of an old line in a power distribution unit to the total length of the line of the power distribution unit, wherein the old line refers to a line with the operation age of more than 20 years, and the calculation formula comprises the following steps:
the line section standardization rate refers to the proportion of the line length of a standard section adopted in a power distribution unit in the total line length, and the calculation formula is as follows:
the line length overrun proportion refers to the ratio of the number of lines with power supply radius exceeding the standard to the total number of the lines, the power supply radius of the lines refers to the line length from outgoing lines at the low-voltage side of the transformer substation to the farthest power supply load point of the transformer substation, and the calculation formula is as follows:
the reasonable line section rate refers to the ratio of the number of lines with the capacity of each section controlled to be 1600-3300 kVA to the total number of lines, and the calculation formula is as follows:
the line operation balance degree refers to the line operation balance in the power distribution unit, the ratio of the number of lines with the operation efficiency meeting the standard requirement to the total number of the lines is calculated by the formula:
the load development saturation is the ratio of the current load of the power distribution unit to the expected load in the planning, and the calculation formula is as follows:
the ratio of the openable capacity to the total power supply capacity of the distribution unit is calculated by considering the ratio of the openable capacity in the distribution unit to the total power supply capacity of the distribution unit under the condition that a line N-1 in the distribution unit is limited:
the user access convenience refers to the ratio of the total length of all public lines in the power distribution unit to the effective power supply area in the region; calculating the formula:
in the above steps, particularly, in the step D1, a 1-9 scale meaning table is adopted to construct a fuzzy judgment matrix; wherein:
1 the former i and the latter j have equal importance;
3 the former i is slightly more important than the latter j;
5 the former i is significantly more important than the latter j;
7 the former i is more strongly important than the latter j;
9 the former i is extremely important than the latter j;
2. 4, 6, 8 represent the scale values corresponding to the intermediate state of the above-mentioned judgement; if the ratio of the importance of element i to element j is aij(ii) a The ratio of the importance of element j to element i is aji＝1/aij。
In the above step, in particular, in the step D2, the index weight is
In the above step, in particular, the step D2 is to calculate the geometric mean W of each index of the power distribution units in the group for each index groupi、QiLet m-order judge moment as
And multiplying each element by rows and dividing by m-th power to obtain the geometric average value of each row element:
then handle biNormalization, i ═ 1, 2, 3.. m; find the index xiWeight coefficient of (c):
in the above steps, particularly, the line indicated by the N-1 passing rate of the line further includes a section of an overhead line, a ring network power distribution unit of a cable line and a section of cable incoming body.
The beneficial effects are that:
the invention divides the power distribution network jurisdiction into a plurality of power distribution units, and integrally packs the construction projects within the range of the power distribution network units. A power distribution network project planning analysis evaluation system is established by taking a power distribution unit as a research object to evaluate, the method starts from two dimensions of power distribution unit development level and power distribution unit input-output benefit to analyze main factors influencing project planning, an index system is established, an index evaluation standard is formulated, index weight setting is carried out, a comprehensive adjustment coefficient is introduced to calculate final evaluation scores of the power distribution units, sorting is carried out according to the final scores of the power distribution units, the stock and increment of the power distribution units can be considered, the current power distribution network development level and the power distribution network input-output efficiency during evaluation of the power distribution units can be comprehensively established, critical imperative degrees of internal demand and external demand are quantized, the mode that investment benefits are simply evaluated from the economic benefit angle in the past is changed, the multiple aspects of technical improvement, construction direction, economic benefit and the like are related, the absolute 'score' and 'effect' of power distribution network development are evaluated, and the relative benefit and efficiency of power grid investment are concerned, and the improvement and promotion of the traditional power distribution network planning method mainly based on output are realized.
Drawings
Fig. 1 is a schematic diagram of a system in a power distribution network project planning method based on the comprehensive benefits of power distribution units.
Detailed Description
The invention is described in detail below with reference to specific embodiments.
The invention defines a plurality of power distribution units according to the power distribution network administration range of a power supply system, and constructs a power distribution network project planning system by taking the power distribution units as research objects based on the power distribution units. Based on the principle, the power distribution network project planning method based on the comprehensive benefits of the power distribution units guarantees the uniform standard of fund distribution decision, meets the actual requirements of regional power distribution network construction, guarantees the scientific plan of the construction level of the interval power distribution network, scientifically and effectively analyzes the requirements of each power distribution project, quantifies and calculates the importance degree of each project, realizes the priority analysis of the power distribution network construction, can comprehensively analyze the investment benefits of the power distribution network, and improves the comprehensive benefits of project investment. The method comprises the following specific steps:
step one, completing the division of a power distribution unit;
1. dividing the jurisdiction range of a power distribution network of a power supply enterprise in the city into a plurality of power distribution units, wherein the principle of unit division is as follows: the method specifically comprises the following steps:
on the basis of planning of power supply partitions of a power distribution network, dividing power distribution units one by taking the conditions of not crossing municipal partitions and not crossing control rule boundaries as limiting conditions; wherein: for the non-control-gauge area, dividing power supply units according to the power supply range of a main power supply point; each power supply unit is provided with at least 2 main power supply sources, and each power supply unit comprises 1-3 groups of 10 kilovolt typical connections, otherwise, similar or directly adjacent power supply areas containing the minimum main power supply sources are combined to be used as a new power supply unit for processing; the subareas consist of a plurality of adjacent land parcels with similar development degree and basically consistent power supply reliability requirements.
2. The unit attributes of each power distribution unit are given, the unit attributes comprise power supply partition types (A-D) and function positioning, and the classification result reflects the importance degree of the power distribution unit and is the most intuitive factor influencing whether investment allocation is inclined or not.
3. And classifying the items in the power distribution network planning item library according to the power distribution units, and packaging the items of the same power distribution unit to the power distribution unit.
Step two, establishing an evaluation system based on a power distribution unit;
considering both stock and increment of the power distribution units, comprehensively considering the current power grid development level of the power distribution units and the input-output efficiency of the power distribution network during evaluation, wherein the evaluation system comprises a development level index group and an input-output index group; wherein:
1. the development level index group mainly aims at the current situation of the power distribution unit and quantifies the demand degree of internal demand and external demand; specifically, the method comprises the following steps:
as shown in table 1, the development level index group includes a line average power supply number index, a line standard connection ratio index, a line N-1 passage rate index, a line heavy load index, an overhead line insulation rate index, an old line index, a line section reasonable rate index, a line length overrun index, a line section standardization rate index, a line operation balance index, a load development saturation index, an openable capacity ratio index, and a user access convenience index;
TABLE 1 specific evaluation index group for development level of distribution unit
Wherein, each index is defined as follows:
(1) average number of power sources: and counting power supply points of each 10kV circuit in the unit, wherein one return line from different transformer substations is counted as an additional power supply point. The index reflects the load transfer capacity of each power distribution unit under the condition of the fault of the upper-level power supply point on one hand, and reflects the satisfaction degree of the power distribution units to the requirements of the double power supplies on the other hand, and a calculation formula is as follows:
(2) standard wiring proportion: and a wiring mode recommended by a guide rule is adopted, so that the requirement on the reliability of regional power supply is met, and meanwhile, the circuit contact mode is simplified. The index evaluation mainly reflects the rationality of the unit internal framework structure and the support degree of the unit power supply reliability, and the formula is calculated:
(3) line N-1 pass rate: the condition that the line meets the N-1 verification means that when one section of the line, including the section of the overhead line, one ring network unit of the cable line or one section of cable inlet body) fails or is scheduled to exit the operation, the normal power supply of the rest lines is not influenced. The index evaluates the power supply safety of the distribution line under a single fault condition, and mainly inspects the power supply transferring capability of the line; calculating the formula:
(4) line overload rate: a heavy load line refers to a line with a maximum load rate greater than 80%. The line load rate is an index reflecting the power supply capacity and the power supply margin of a single line; calculating the formula:
(5) overhead line insulation rate: and the length of the overhead line insulated line in the unit accounts for the proportion of the total length of the overhead line in the unit. The insulation rate of the overhead line is improved, so that the fault rate of the distribution network can be effectively reduced, and the operation reliability of equipment is improved; calculating the formula:
(6) the old line proportion: the length of an old line in the unit accounts for the proportion of the total length of the unit line, and the operating life of the old line is more than 20 years; calculating the formula:
(7) line section normalization rate: the length of a 10kV line with a standard section in the unit accounts for the total length of the 10kV line, and the section of a 10kV line lead is selected to meet the requirements of Q/GDW10370-2016 & technical guide of distribution networks.
Calculating the formula:
(8) line length overrun proportion: the length exceeding limit means that the 10kV power supply radius exceeds the guide rule requirement. The power supply radius of a 10kV line refers to the length of the line from the outgoing line on the low-voltage side of the substation to the farthest load point where it supplies power. The length of the power supply distance of the line has an important influence on the power supply quality, under the condition of the same section of the lead, the tail end voltage drop is large and the corresponding line loss is generally large if the power supply radius of the line is long, otherwise, the tail end voltage drop is small and the line loss is small; calculating the formula:
(9) line segmentation reasonable rate: the line is reasonably segmented, namely a single main trunk line is divided into 3-5 sections, the capacity of each section is controlled to be 1600-3300 kVA, the scheduling flexibility can be improved through reasonable segmentation, the number of households under the influence of fault power failure is reduced, and the power supply reliability is improved; calculating the formula:
(10) line running balance degree: the index is explained as follows: in order to realize reasonable utilization of power grid resources, 10kV lines in the same unit need to run in a balanced mode, and the running efficiency of the 10kV lines should not have too large difference. The analysis of the balance degree of the operating efficiency of the 10kV line can reflect the problems in planning construction and scheduling operation, and the calculation formula is as follows:
wherein:
EERiis the load rate per line within a unit.
(11) Load development saturation: the load development saturation is an index indicating the development degree of the unit load, and the load development saturation is calculated by adopting the ratio of the existing load development degree to the recent load development degree; calculating the formula:
(12) open capacity ratio: fully considering the condition limit of a line N-1 in a power distribution unit, and calculating the available margin in the unit, namely the condition of openable capacity; the index is used as a judgment basis for judging whether the business expansion installation can be directly connected into a power grid, on one hand, the power supply capacity of the current situation of the power distribution unit can be reflected, on the other hand, the adaptability of the existing net rack and the existing line to the load development can be dynamically analyzed according to the load increase and the business expansion installation situation, the support degree of the power supply capacity corresponding to the current net rack of the power distribution unit to the future load development is reflected, and a formula is calculated:
(13) user access convenience: and reflecting the convenience degree of the power distribution unit for user access. Because the access radius of the users is not easy to be counted and the number of the users is large, the index definition adopts a calculation mode similar to urban road network density, namely, the ratio of the total length of all public lines in a region to the effective power supply area in the region is calculated; calculating the formula:
setting different target values for units under different power supply partitions or different function positioning according to the actual running condition of the power distribution network and related guide rule requirements, uniformly converting indexes of different dimensions into specific values by a normalization method according to the difference between the current index values and the target values, and uniformly converting the current index levels into scores under a percentage system;
as shown in table 2, firstly, according to the index meaning, the specific indexes of the development level of the power distribution unit are subjected to attribute classification, the attributes are divided into a forward index attribute and a reverse index attribute, the forward attribute index y indicates that the higher the value of the index is, the better the value is, and the ideal value is 1; the reverse attribute index is the lower the value is, the better the value is, and the ideal value is 0. For different index attributes, the index score calculation formula is as follows:
the forward direction index:
reverse indexes are as follows:
in the formula: x is the current state value of the evaluation index, and y is the score of the evaluation index; for forward or reverse indicators, a is the lower indicator limit and a score of 0 below this value; b is the upper limit of the index, i.e., the target value, which is fully satisfied when the index is reached or exceeded.
Table 2 evaluation index reference coefficient table for each power supply area
2. The invention relates to a method for evaluating investment income of a power distribution network, which comprises the steps of inputting and outputting an evaluation index group, evaluating three indexes of a technical improvement index, a construction direction index and an economic benefit index in order to overcome the defect that investment income is evaluated from the economic benefit perspective in the past, and realizing beneficial supplement and improvement of a power distribution network evaluation system.
The invention uses a difference ratio calculation method to express the improvement effect of the power distribution network planning execution on the specific characteristic indexes of each unit, and reflects the improvement effect through the change of two power grid indexes before investment and after investment is finished, so that the difference ratio can objectively reflect the investment implementation effect and can form a uniform dimension and standard among different indexes, and the difference ratio is uniformly defined as the percentage of the operation effect index improvement degree accounting for the improvement space of the indexes after the investment implementation.
According to the principle, the difference ratio calculation method firstly utilizes two power grid indexes after investment is completed and before investment is carried out to obtain the difference value, and then the difference value is multiplied by a corresponding normalization coefficient. The current value of the index and the inverse of the ideal value difference are used as the normalization coefficient of the difference ratio. The specific characteristic index types are different, and the calculation method of the difference ratio is also different. When the specific characteristic index is a forward index, if the specific characteristic index value becomes larger after the planning is executed, the index is improved, and the difference ratio value can be calculated by combining the specific characteristic index value and an ideal value before and after the planning is executed;
if the specific characteristic index becomes small after the planning is executed, the index is not improved, and the difference ratio value is 0. When the specific characteristic index is a reverse index, if the specific characteristic index value becomes smaller after the planning is executed, the index is improved, and the difference ratio value can be calculated by combining the specific characteristic index value and the ideal value before and after the planning is executed; if the specific characteristic index becomes larger after the planning is executed, the index is not improved, and the difference ratio value is 0. When the specific characteristic index is an intermediate index, if the specific characteristic index value is closer to an ideal value after the planning is executed, the index is improved, and the difference ratio value can be calculated by combining the specific characteristic index value and the ideal value before and after the planning is executed; if the difference between the specific characteristic index value and the ideal value is larger after the planning is executed, the index is not improved, and the difference ratio value is 0. The specific calculation method is as follows.
The forward direction index calculation method comprises the following steps: when the specific characteristic index is a forward index, the ideal index value of each region is 100, and n is set1And n2The index values before and after implementation are respectively, the normalization coefficient is 1/(100-n1), the actual improvement value of the index is related to the change of the index value, and the calculation formula of the specific characteristic index improvement effect index value y is shown as the following formula:
the reverse index calculation method comprises the following steps: when the specific characteristic index is a reverse index, the ideal value of the index is 0, and n is set1And n2The index values before and after implementation are respectively, the normalization coefficient is 1/n1, and the calculation formula of the specific characteristic index improvement effect index value y obtained by the same method is shown as the following formula:
(2) index of construction direction
The construction direction is a positive indicator, idealThe values are 100% for all power partitions. According to the calculation model, corresponding grading standard is constructed
In the formula: x is a radical of a fluorine atomopThe length of the newly built or modified line in the unit, which accords with the direction of the target net rack, is determined; x is a radical of a fluorine atomnewAnd newly building the total length of the line in the unit.
(3) Economic benefit index
Because the change range of the benefit value of the power grid is large, the change range belongs to a forward index theoretically, the larger the change range is, the better the change range is, and the specific size is, the better the change range is, and no boundary exists. Therefore, in order to enable the value to have the same evaluation dimension as other specific evaluation indexes, the index value of the value is converted into a score between 0 and 1, and a corresponding scoring standard is constructed
In the formula xiThe power grid benefit cost ratio for each unit; x is the number ofmaxAnd the benefit-cost ratio of the power grid is the maximum value for all the units.
Step seven, index weight setting; distribution unit development level index weight; as shown in Table 3, the power distribution unit development level index weight adopts a 1-9 scale meaning table to construct a fuzzy judgment matrix and assigns values.
TABLE 3 significance Scale of significance table
As shown in tables 4 to 5, the index weight calculation steps are as follows:
(1) constructing a fuzzy judgment matrix; comprehensively balancing various conditions, and respectively providing index fuzzy judgment matrixes of internal requirements and external requirements.
TABLE 4 fuzzy judgement matrix of power distribution unit development level (inner demand)
TABLE 5 fuzzy decision matrix for development level of distribution unit (external demand)
| Index (es) | Saturation of load development | Open capacity fraction | User access convenience |
| Saturation of load development | 1.00 | 1.00 | 2.00 |
| Open capacity fraction | 1.00 | 1.00 | 2.00 |
| User access convenience | 0.50 | 0.50 | 1.00 |
(2) Weighting by geometric mean
Respectively calculating the geometric mean W of the indexes of the internal demand and the external demand of the development level of the power distribution uniti、QiLet m-th order judgment moment be
Firstly, multiplying each element by row and dividing by m-th power to obtain the geometric mean value of each row of elements:
specifically, taking "action plan for construction and reconstruction of power distribution network (2015-2010) as a standard, taking ordinary residents, ordinary residents of industrial power distribution networks and industrial standard power distribution network lines as an example, the values are calculated as follows:
TABLE 6 calculation results of specific index weight values of development levels of power distribution units
2. The input and output benefit index weight of the power distribution unit;
the same method as the power distribution unit development level index weight setting method is adopted, a 1-9 scale meaning table is adopted to construct a fuzzy judgment matrix and the fuzzy judgment matrix is assigned, and the obtained fuzzy judgment matrix is shown in a table 7:
TABLE 7 fuzzy decision matrix for input-output benefits
| Index (I) | Technical improvement | Direction of construction | Benefits of the grid |
| Technical improvement | 1 | 3 | 1 |
| Direction of construction | 1/3 | 1 | 1/3 |
| Benefits of the grid | 1 | 3 | 1 |
With distribution network construction transformation action plan (2015-2010), to ordinary resident and industry standard distribution network, obtain the weight value of each item of specific index through calculating: the lifting weight of the power grid technology is 0.43, the weight of the construction direction is 0.14, and the benefit weight of the power grid is 0.43.
Step eight, adjusting comprehensive coefficient
According to the project planning analysis and evaluation system based on the power distribution unit, after the indexes are selected, the scoring standards and the weights are set, the power distribution unit can be scored according to two dimensions of the development level of the power distribution unit and the input and output benefits of the power distribution unit, and the two dimensions are fully scored by 100. On the basis of evaluating the development level of the power distribution network element and grading the input-output benefits, an incentive health care theory is introduced by adopting the principle that the investment of a power distribution network tends to be 'weak development level index and strong input-output index', and the comprehensive adjustment score of the power distribution unit is calculated by setting interval coefficients, wherein the function is as follows:
yi＝(k1i×ai+k2i×bi)/2
in the formula: a isiEvaluating scores for the development levels of the distribution networks of the ith distribution unit; k is a radical of1iEvaluating and adjusting coefficients for the development level of the distribution network of the ith power distribution unit, wherein the coefficients are excitation factors when the coefficients are more than 1, and health-care factors are otherwise obtained; biEvaluating scores for input and output of the distribution network of the ith distribution unit; k is a radical of formula2iAnd (4) evaluating and adjusting the input and output of the distribution network of the ith distribution unit, wherein the evaluation and adjustment coefficient is an excitation factor when the input and output of the distribution network of the ith distribution unit is greater than 1, and otherwise, the evaluation and adjustment coefficient is a health-care factor.
The evaluation factor was calculated as follows: the development level evaluation factors are:
the input-output evaluation factors are as follows:
through the steps, the power enterprises can quantitatively score the power distribution units within the jurisdiction range, and can quantitatively score the power distribution units to arrange the investment projects of the units according to the power distribution units during investment arrangement.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the protection scope of the present invention, 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 can 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.
Claims (7)
1. A power distribution network project planning method based on comprehensive benefits of power distribution units is characterized by comprising the following steps:
step one, completing the division of a power distribution unit; comprises A1-A3:
A1. dividing the jurisdiction range of the power distribution network into a plurality of power distribution units, namely dividing the power distribution units one by one on the basis of planning of power distribution partitions of the power distribution network and on the basis of limiting conditions that municipal partitions are not crossed and control rule boundaries are not crossed;
A2. the method comprises the following steps of (1) defining the attribute of each power distribution unit according to the actual situation of each power distribution unit, wherein the attribute of each power distribution unit comprises a power supply partition type and function positioning;
A3. classifying items in a power distribution network planning item library according to power distribution units, and packaging items belonging to the same power distribution unit to the power distribution unit;
step two, establishing an evaluation system based on a power distribution unit; the evaluation system comprises a development level index group and an input-output index group; wherein: B1-B2:
B1. the development level index group comprises a line average power supply number index, a line standard wiring proportion index, a line N-1 passing rate index, a line heavy load index, an overhead line insulation rate index, an old line index, a line section reasonable rate index, a line length overrun index, a line section standardization rate index, a line operation balance degree index, a load development saturation degree index, an openable capacity proportion index and a user access convenience degree index;
B2. an input-output evaluation index group, which comprises a technical improvement index, a construction direction index and an economic benefit index;
setting different target values for the power distribution unit according to power supply partitions or function positioning, uniformly converting the indexes with different dimensions into specific numerical values by a normalization method according to the current values and target value differences of all indexes in the development level index group, and uniformly converting the current levels of all indexes in the development level index group into scores under the control of percentages; the paint specifically comprises C1-C2:
C1. according to the index meaning, carrying out attribute classification on each index in the development level index group of the power distribution unit, and dividing the indexes into forward indexes and reverse indexes, wherein the forward indexes refer to the indexes with higher values and better values; the reverse index is that the lower the value is, the better the index score calculation formula is as follows:
the forward direction index:
reverse indexes are as follows:
in the formula: x is the current index value, and n is the index score; a is an index upper limit or an index lower limit;
C2. calculating the difference ratio of each index of the input-output evaluation index group according to the index meaning, wherein the difference ratio is the percentage of the improvement degree of each index of the input-output evaluation index group in the improvement space of the index after investment implementation;
the forward index calculation method comprises the following steps: let n1And n2The index values before and after implementation are respectively, the normalization coefficient is 1/(100-n1), and the calculation formula of the specific characteristic index improvement effect index value y is shown as the following formula:
the reverse index calculation method comprises the following steps: let n1And n2Before and after the implementation, the index values are respectively, the normalization coefficient is 1/n1, and the calculation formula of the specific characteristic index improvement effect index value y is shown as the following formula:
step four, constructing a fuzzy judgment matrix and assigning values; and respectively calculating the weight coefficients of all indexes in each index group, wherein the weight coefficients specifically comprise D1-D2:
D1. constructing a weight modeling fuzzy judgment matrix and assigning values;
D2. calculating the weight by a geometric mean method, respectively calculating the geometric mean of indexes required in the development level of the power distribution unit and required outside the development level on the basis of the fuzzy judgment matrix and the assignment thereof, multiplying and developing each element by rows to obtain the geometric mean value of each row of elements, and obtaining the weight coefficient of each index after normalization;
step five, calculating the comprehensive adjustment score of the power distribution unit, wherein the adjustment score calculation function is as follows:
yi＝(k1i×ai+k2i×bi)/2；
in the formula: a isiEvaluating scores for the development levels of the distribution networks of the ith distribution unit; k is a radical of1iEvaluating and adjusting coefficients for the development level of the distribution network of the ith power distribution unit, wherein the coefficients are excitation factors when the coefficients are more than 1, and health-care factors are otherwise obtained; biEvaluating scores for input and output of the distribution network of the ith distribution unit; k is a radical of2iThe input and output evaluation adjustment coefficient of the distribution network of the ith distribution unit is an excitation factor when the input and output evaluation adjustment coefficient is greater than 1, and otherwise, the input and output evaluation adjustment coefficient is a health-care factor;
and step six, respectively calculating the comprehensive adjustment scores of the power distribution units for different planning area schemes according to the step three to the step five, carrying out statistical sequencing on the comprehensive adjustment scores calculated by the planning schemes, judging the priority of the planning schemes according to the sequence from high to low, and indicating that the higher the score is, the higher the comprehensive benefit is.
2. The power distribution network project planning method based on the comprehensive benefits of the power distribution units as claimed in claim 1, wherein in the step a 1: for the area without the control gauge, dividing power distribution units according to the power distribution range of a main power distribution source point; each power distribution unit is provided with at least 2 main power supplies and comprises 1-3 groups of 10 kilovolt typical wirings, otherwise, similar or directly adjacent power distribution areas containing the minimum main power supplies are combined to be treated as a new power distribution unit; the power distribution area is composed of a plurality of adjacent land parcels with similar development degree and basically consistent power distribution reliability requirement.
3. The power distribution network project planning method based on comprehensive benefits of power distribution units as claimed in claim 1, wherein in the step B1:
the average power number is a ratio of the total number of power supplies in the line to the total number of the line, wherein a tie line from different transformer substations is an additional power point, and the calculation formula is as follows:
the standard wiring proportion refers to the proportion of the line adopting the standard wiring mode in the total line, and the calculation formula is as follows:
the line N-1 passing rate refers to the rate that the line meets the N-1 verification, and the line meets the N-1 verification means that the normal power supply of the rest lines is not influenced when the line is in fault or is scheduled to exit the operation; calculating the formula:
the line overloading rate is the ratio of the total number of overloading lines to the total number of lines, the overloading line is the line with the maximum overloading rate larger than 80%, and the calculation formula is as follows:
the overhead line insulation rate is the proportion of the length of an overhead line insulation line in a power distribution unit to the total length of the overhead line of the power distribution unit, and a calculation formula is as follows:
the old proportion of the line refers to the old proportion in the power distribution unitThe line length accounts for the proportion of the total length of the power distribution unit line, wherein the old line refers to a line with the operation age of more than 20 years, and the calculation formula is as follows:
the line section standardization rate is the proportion of the line length of the standard section in the power distribution unit in the total line length, and the calculation formula is as follows:
the line length overrun proportion refers to the ratio of the number of lines with power supply radius exceeding the standard to the total number of the lines, the power supply radius of the lines refers to the line length from outgoing lines at the low-voltage side of the transformer substation to the farthest power supply load point of the transformer substation, and the calculation formula is as follows:
the line segmentation reasonable rate is the ratio of the number of lines with the capacity of each section controlled to be 1600-3300 kVA to the total number of lines, and the calculation formula is as follows:
the line operation balance degree refers to the ratio of the line operation balance in the power distribution unit and the total number of lines with the operation efficiency meeting the standard requirement to the total number of the lines, and the calculation formula is as follows:
wherein:
EERithe load rate of each line in the power distribution unit;
the load development saturation is the ratio of the current load of the power distribution unit to the expected load in the planning, and the calculation formula is as follows:
the ratio of the openable capacity to the total power supply capacity of the distribution unit is calculated by considering the ratio of the openable capacity in the distribution unit to the total power supply capacity of the distribution unit under the condition that a line N-1 in the distribution unit is limited:
the user access convenience refers to the ratio of the total length of all public lines in the power distribution unit to the effective power supply area in the region; calculating the formula:
4. the power distribution network project planning method based on the comprehensive benefits of the power distribution units as claimed in claim 1, wherein in the step D1, a fuzzy judgment matrix is constructed by adopting a 1-9 scale meaning table; wherein:
1 the former i and the latter j are of equal importance
3 the former i is slightly more important than the latter j
5 the former i is significantly more important than the latter j
7 the former i is more strongly important than the latter j
9 the former i is extremely important than the latter j
2. 4, 6, 8 represent the scale values corresponding to the intermediate state of the above-mentioned judgement;
if the ratio of the importance of element i to element j is aij(ii) a The ratio of the importance of element j to element i is aji＝1/aij。
5. The power distribution network project planning method based on comprehensive benefits of power distribution units according to claim 1, wherein in the step D2, the index weights of the power distribution network project planning method are as follows:
6. the power distribution network project planning method based on the comprehensive benefits of the power distribution units as claimed in claim 1,
d2, calculating the geometric mean of each index of the distribution units in the group, and setting m-order judgment moment as
And multiplying each element by rows and dividing by m-th power to obtain the geometric average value of each row element:
then b is processediNormalizing to obtain index xiWeight coefficient of (c):
7. the power distribution network project planning method based on the comprehensive benefits of the power distribution units as claimed in claim 1, wherein the line indicated by the N-1 passage rate of the line further comprises a section of an overhead line, a looped network power distribution unit of a cable line and a section of a cable incoming line body.
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| CN109359837A (en) * | 2018-09-29 | 2019-02-19 | 国网四川省电力公司经济技术研究院 | A kind of assessment of active distribution network technical economic benefit and investment decision method |
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