CN111476678A - Method for calculating comprehensive cost of direct-current power distribution network - Google Patents

Method for calculating comprehensive cost of direct-current power distribution network Download PDF

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CN111476678A
CN111476678A CN202010286524.7A CN202010286524A CN111476678A CN 111476678 A CN111476678 A CN 111476678A CN 202010286524 A CN202010286524 A CN 202010286524A CN 111476678 A CN111476678 A CN 111476678A
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distribution network
direct
loss
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CN111476678B (en
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王利利
于昊正
胡扬宇
李锰
陈鹏浩
李秋燕
李慧璇
李鹏
田春筝
许长清
全少理
张艺涵
郑永乐
李科
孙义豪
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State Grid Corp of China SGCC
Economic and Technological Research Institute of State Grid Henan Electric Power Co Ltd
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State Grid Corp of China SGCC
Economic and Technological Research Institute of State Grid Henan Electric Power Co Ltd
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
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    • G06Q50/06—Electricity, gas or water supply
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
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    • G06Q30/0201—Market modelling; Market analysis; Collecting market data
    • G06Q30/0206—Price or cost determination based on market factors
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J1/00—Circuit arrangements for dc mains or dc distribution networks
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S10/00—Systems supporting electrical power generation, transmission or distribution
    • Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications

Abstract

The invention discloses a method for calculating the comprehensive cost of a direct-current power distribution network, which comprises the following steps: determining an economic index, wherein the economic index parameters comprise line construction cost and network loss cost; determining a reliability index, wherein the reliability index parameters comprise the importance degree of a load, the load size and the average power shortage duration of the load; determining an objective function of the comprehensive cost according to the economic index and the reliability index; and optimizing the objective function by using constraint conditions. The invention provides a method for calculating the comprehensive cost of a direct current power distribution network, and provides a novel method for calculating the reliability index.

Description

Method for calculating comprehensive cost of direct-current power distribution network
Technical Field
The invention relates to the technical field of direct current distribution network topology structures, in particular to a method for calculating the comprehensive cost of a direct current distribution network.
Background
With the progress of power electronic technology, the direct current distribution network has a wide development prospect, and the determination of the network structure of the direct current distribution network is the basis of the construction of the direct current distribution network. The prior art makes certain research on planning of a network structure of a direct-current power distribution network, and some prior arts aim to combine traditional economic indexes such as line investment, operation maintenance and network loss with carbon emission environmental cost, establish a direct-current power distribution network frame planning model, bring the functions of a distributed power supply and a flexible load into the planning model, obtain a better result, but do not consider the reliability of the direct-current power distribution network. In the prior art, a risk model is added into a planning model, the load shedding cost and the expected value cost of power supply insufficiency are given, so that the reliability index is quantitatively added into an objective function, and the reliability and the economy of power grid planning are considered by using a full life cycle model in the prior art. However, the above researches do not consider the particularity of the dc power distribution network in different application scenarios, and thus the pertinence is not strong. In addition, the weight between the costs of the objective function is a fixed value, and the influence generated when a certain index is too large is ignored.
Disclosure of Invention
The invention aims to provide a method for calculating the comprehensive cost of a direct current distribution network, which is used for solving at least part of defects in the prior art.
The invention further aims to provide a method for calculating the comprehensive cost of the direct-current power distribution network, which has reliable data and strong universality.
Particularly, the invention provides a method for calculating the comprehensive cost of a direct-current power distribution network, which comprises the following steps:
determining an economic index, wherein the economic index parameters comprise line construction cost and network loss cost;
determining a reliability index, wherein the reliability index parameters comprise the importance degree of a load, the load size and the average power shortage duration of the load;
determining an objective function of the comprehensive cost according to the economic index and the reliability index;
and optimizing the objective function by using constraint conditions.
Preferably, the economic indicator calculation formula is: cj＝CB+ClPloss；
Wherein, CBFor line construction costs, ClIs unit loss cost, PlossIs the line loss of the dc distribution network.
Preferably, the line loss P of the DC distribution networklossThe calculation formula of (2) is as follows:
Figure BDA0002448718960000021
wherein n is the number of the bus bars, ViA direct voltage, V, for the bus ijDC voltage, y, for bus jijIs the dc conductance between bus i and bus j.
Preferably, the reliability index is calculated by the following formula: ck＝γ·tloss·Im·P；
Wherein, CkCost equivalent to reliability; gamma is a conversion coefficient; t is tlossThe average power failure time is related to the power failure rate and the repair time of the fault; i ismThe load is the important degree, and is mainly measured by the economic loss caused by the power failure of the load; p is the load size.
Preferably, the objective function is: min C ═ w1Cj+w2Ck；
Wherein C is the overall cost, w1、w2Are weight coefficients.
Preferably, the weight coefficient is calculated by the formula:
Figure BDA0002448718960000031
Figure BDA0002448718960000032
wherein α is an adjustment coefficient, determined according to reliability cost and economic cost values, wi0Is the initial weight.
Preferably, the constraints include connectivity constraints and overload constraints.
Compared with the method for calculating the comprehensive cost of the direct-current power distribution network in the prior art, the method for calculating the comprehensive cost of the direct-current power distribution network has the following beneficial effects:
according to the method for calculating the comprehensive cost of the direct-current power distribution network, the direct-current power distribution network line planning is researched according to different application scenes, the topological structure of the direct-current power distribution network is planned under two application scenes respectively, the line construction cost and the line loss cost are selected as economic indexes, a new reliability index calculation method is provided, a weight-variable method is introduced to construct a target function, the method for calculating the comprehensive cost of the direct-current power distribution network is stronger in universality of evaluating the comprehensive cost of the direct-current power distribution network under different scenes, and the obtained data of the comprehensive cost is more reliable.
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The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Fig. 1 is a schematic diagram illustrating a method for calculating the comprehensive cost of a dc distribution network according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of the reliability cost weighting according to the variation thereof according to one embodiment of the present invention;
FIG. 3 is a schematic diagram of an optimization algorithm of an objective function of the comprehensive cost of the DC power distribution network according to an embodiment of the invention;
fig. 4 is a schematic view of a route planning plan optimizing process for residential areas according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a route planning scenario optimization process for an industrial park according to one embodiment of the invention;
FIG. 6 is a diagram illustrating an iterative process before optimization of an objective function algorithm according to an embodiment of the present invention;
FIG. 7 is a diagram illustrating an iterative process after optimization of an objective function algorithm according to an embodiment of the present invention.
Detailed Description
The present invention will be further described with reference to the following examples. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a method for calculating the comprehensive cost of a direct current power distribution network, which introduces an economic index and a reliability index at the same time and represents the comprehensive cost of the direct current power distribution network. As shown in fig. 1, the method specifically includes the following steps:
step S101: and determining an economic index.
Specifically, the economy of the direct current power distribution network is an important part of power distribution network planning, and is inseparable from the construction cost and the operation cost of the direct current power distribution network, and the economy of the direct current power distribution network topological structure mainly depends on the line construction cost and the network loss cost, so that the economic index calculation formula is
Cj＝CB+ClPloss(1)
In the formula CBFor line construction costs, ClIs unit loss cost, PlossIs the line loss, P, of the DC distribution networklossIs calculated by the formula
Figure BDA0002448718960000051
Wherein n is the number of bus bars, ViA direct voltage, V, for the bus ijDC voltage, y, for bus jijIs the dc conductance between bus i and bus j.
Step S102: and determining the reliability index.
Specifically, reliability is an important index for measuring the quality of the direct current power distribution network, and the commonly used reliability indexes are fault outage rate, outage duration, power shortage cost and the like. However, in the invention, considering that the reliability of the direct current distribution network is mainly influenced by factors such as the importance degree of the load, the load size, the average power shortage duration of the load and the like, the indexes are selected to express the reliability, namely the calculation formula of the reliability index is as follows:
Ck＝γ·tloss·Im·P (3)
in the formula, CkFor cost equivalent to reliability, γ is the conversion coefficient, tlossTo average outage time, which is related to outage rate and repair time of the fault, ImThe importance of the load is mainly measured by the economic loss caused by the power failure of the load, and P is the size of the load.
The loads can be mainly divided into industrial loads, resident loads and office administrative loads, and the relative importance of the loads is determined according to actual operation experience by using an analytic hierarchy process and is shown in table 1.
TABLE 1 relative importance of various types of loads
Table 1 Relative importance of various loads
Figure BDA0002448718960000061
The relative importance of the industrial load, the residential load and the office administrative load is as follows
Im＝[0.243 0.088 0.669](4)
Calculated to obtain CR＝0.061<0.1, passing the consistency test.
Step S103: and determining an objective function of the comprehensive cost according to the economic index and the reliability index.
Specifically, the economic index and the reliability index are comprehensively considered, and the objective function is determined to be
min C＝w1Cj+w2Ck(5)
Wherein C is the overall cost, w1、w2Are weight coefficients. If the economy or reliability of the planning scheme of the power grid is too low, the weight of the planning scheme needs to be increased to improve the influence of the planning scheme on the direct current distribution power grid, so that a weight-variable method is adopted in the application, namely a sigmoid function is utilized to obtain a calculation formula of a weight coefficient:
Figure BDA0002448718960000062
Figure BDA0002448718960000063
wherein α is an adjustment coefficient, and is determined according to the reliability cost and economic cost values, wi0Is the initial weight.
Step S104: and optimizing the objective function by using the constraint condition.
Specifically, the constraint conditions include connectivity constraints and overload constraints, that is, if the direct current power distribution network adopts the objective function to control the integrated cost, the direct current power distribution network is disconnected in connection or overloaded, and the objective function needs to be re-optimized.
Further, the direct-current power distribution network is connected under the normal operation condition, and cannot be divided into independent systems to operate, so that connectivity judgment must be carried out, and a planning scheme which does not meet the connectivity is screened out.
Power S transmitted by any transmission linelShould not exceed its maximum capacity SlmaxI.e. by
Sl≤Slmax(8)
Different classes of loads have different requirements on power supply reliability and voltage class. Therefore, the direct-current distribution network needs to be divided into different application scenes based on the characteristics of the direct-current system power supply according to the load characteristics and the power grid construction task, and planning is performed according to the requirements of different scenes. Common typical application scenarios fall into three categories: residential areas, industrial parks and new energy aggregation areas.
Residential areas are mainly subjected to residential load, and the voltage level of the residential areas is mainly determined by the voltage of household appliances such as air conditioners, variable frequency washing machines and the like. The requirement on power supply reliability is relatively low, and excessive economic loss cannot be caused by power failure, so that when power grid planning is carried out, the economical efficiency is taken as a main target, and meanwhile, the radiation type wiring mode is mostly adopted in consideration of simple and convenient wiring and convenient operation.
The industrial park mainly comprises industrial direct current loads, and the voltage grade of the industrial park is generally between 750V and 1.5 kV. The requirement on power supply reliability is high, and a power failure can cause great economic loss, so the reliability of the power supply is mainly considered in planning. The scene is suitable for adopting a wiring mode with higher reliability, such as double-end power supply or annular wiring.
The new energy collection area is mainly used for collecting distributed power supplies such as wind power, photovoltaic power and the like to perform centralized power supply. For convenience of distributed power access, the application scenario generally adopts a ring connection mode.
Since the main purpose of the new energy source concentration area is not to directly supply power to users, the application discusses two application scenarios, namely residential area and industrial park, and determines the initial weight coefficient between the corresponding economic cost and the reliability cost according to the characteristics, namely w in the formula (6)i0. The change rule of the weight of the reliability cost along with the value thereof is shown in FIG. 2, when the reliability cost is lower, the reliability cost is calculated according to the initial weight, and when the reliability cost exceeds a certain value Ck0In this case, the weight coefficient of reliability increases with an increase in reliability cost, and becomes constant in consideration of the non-negligible economic efficiency. A variable weight curve of economic cost can similarly be obtained. The constraints are different for the two application scenarios.
According to the method for calculating the comprehensive cost of the direct-current power distribution network, the direct-current power distribution network line planning is researched according to different application scenes, the topological structure of the direct-current power distribution network is planned under two application scenes respectively, the line construction cost and the line loss cost are selected as economic indexes, a new reliability index calculation method is provided, a weight-variable method is introduced to construct a target function, the method for calculating the comprehensive cost of the direct-current power distribution network is stronger in universality of evaluating the comprehensive cost of the direct-current power distribution network under different scenes, and the obtained data of the comprehensive cost is more reliable.
The invention also provides an optimization algorithm of an objective function of the comprehensive cost of the direct-current power distribution network, the optimization algorithm adopts an artificial bee colony Algorithm (ABC), the artificial bee colony algorithm is an optimization algorithm for simulating bees to search for honey sources, and the algorithm mainly comprises four most basic elements: food source, honey bee gathering, observation and reconnaissance. In the standard ABC algorithm, the honey bees use the initial food source information to search for a new food source, and meanwhile, the honey bee returning honeycomb and the observation bees share the honey source information; observing that bees wait in the honeycomb, and finding a new food source along with returned honey bees with a certain probability; the scout bees are responsible for randomly finding a new valuable food source in the vicinity of the bee nest. The number of the honey-collecting bees is equal to that of the observation bees and is equal to that of the food sources, and the honey-collecting bees correspond to the food sources one by one.
Further, the general steps of the artificial bee colony algorithm are as follows:
step 1, setting the population number, the maximum iteration number MCN and the control parameter limits, determining a search space, namely a solution range, and randomly generating an initial solution x in the search spacei(i＝1,2,3,……,ZN)，ZNThe number of food sources;
step 2, calculating the fitness of each bee, sequencing according to the size of each bee, and taking the first half as a bee collecting bee and the second half as an observation bee;
and 3, searching the neighborhood of the honey bee according to the position update to obtain a new position. The position is updated as
Figure BDA0002448718960000091
Wherein Vij is a newly searched food source of the honey bee i after the j iteration, and XijIs the location, X, of the honey bee i after the jth iterationkjFor the location of the honey bee k, k is [1, Z ]N]Random integer between and k ≠ i, φijIs [ -1,1 [ ]]A random number in between;
step 4, according to a greedy selection principle, if the fitness of the new position is greater than that of the original position, updating the original position by using the new position; otherwise, the original position is kept unchanged. Greedy selection formula is
Figure BDA0002448718960000092
In the formula, fit (X)ij)、fit(Vij) Respectively as food sources for the current location of the honey beeFitness of the newly searched food source;
step 5, observing bees according to the probability PijAnd selecting bees to collect based on roulette principle, in principle, PijThe larger the value, the larger the fitness value of the bee collecting i is, and the larger the probability of being selected by the observed bee is. Probability PijIs calculated as
Figure BDA0002448718960000101
After the observation bees complete the honey collection bee selection, the neighborhood is searched by using the formula (9), and the position with high fitness is selected according to the greedy selection principle;
step 6, if the position of a certain bee is not updated after the iteration of limits, the bee is changed into a scout bee, and a new position is randomly generated to replace the original position;
step 7, if the current iteration times are larger than the maximum times MCN, the iteration is finished, and the algorithm is finished; otherwise, turning to step 2.
In the planning problem of the topological structure of the direct-current power distribution network, the positions of the honey collection bees and the observation bees represent a planning scheme, the honey collection bees and the observation bees are associated with the attention degrees of different position points in a search space, and the honey collection bees and the observation bees are mathematical abstract carriers for calculating the optimal allocation mode of resources at each position point in the space. The fitness of each position represents an objective function value of the planning scheme, the formula (5) shows that the DC distribution network planning is to find the minimum value of the comprehensive cost C, and the greedy selection principle and the roulette principle are required to find the maximum value of the fitness, so that the reciprocal of the comprehensive cost is taken when the fitness is found, namely the reciprocal of the comprehensive cost is taken as the fitness value. The artificial bee colony algorithm continuously searches for a position with high fitness, namely a scheme with the minimum comprehensive cost, and an optimal planning scheme and the corresponding fitness can be output through a certain number of iterations, so that the magnitude of the comprehensive cost is obtained.
The invention improves the artificial bee colony algorithm to solve the problem of low convergence speed. The convergence speed of the artificial bee colony algorithm mainly depends on the initialization of the colony, and if the initial colony position distribution is reasonable, the convergence speed can be greatly increased, and the possibility of falling into local optimum is reduced.
The invention optimizes the initialization process of the population by using a maximum-minimum product method, namely, selects the initial bee colony according to the principle of maximum-minimum product so as to disperse the position distribution of the initial bee colony as much as possible, and as shown in figure 3, the optimization algorithm of the objective function of the comprehensive cost of the direct-current power distribution network comprises the following specific steps:
step S301, initializing algorithm parameters, and determining a set M and a set Z.
In particular, Z is chosen randomlyM(ZM>>ZN) The initial positions form a set M, and one of the positions is randomly selected as a first initial position, added to the set Z and deleted from M.
Step S302, selecting the position with the maximum distance from the first initial position, and adding the position into the set Z.
And selecting the position with the maximum distance from the first initial position from the updated M, adding the position into the set Z, and deleting the position from the set M.
Step S303, respectively calculating the positions M in the updated MiDistance to each element in Z.
Respectively calculating the position M in the updated Mi(i＝1,2,…,ZM′,ZM' is the number of positions in M after update) to the distance of each element in Z, the product of the maximum value and the minimum value of the distance is calculated, the position in M corresponding to the maximum product is selected from the products and stored in Z, and the position is deleted from M.
Step S304, judging whether the number of the selected initial positions, namely the number of the positions in the set Z is less than ZN。
If yes, repeating step S302;
if not, step S305 is executed to output the optimal solution obtained by iteration.
In particular, Z in the set Z is directly outputNAs initial position for improving the bee colony algorithm, ZNThis initial position is the optimal solution.
In addition, the position is newer (9) to haveHas the defects of iterative randomness, easy trapping in local optimal solution and slow updating speed, thereby introducing a global optimal factor, namely a position X corresponding to optimal fitnessbest,jThe formula (9) is improved, and the improved position is more novel
Figure BDA0002448718960000121
Wherein m and k are random numbers and are not equal to i, phiij、ψijIs [ -1,1 [ ]]A random number in between.
In specific application, the IEEE standard 14 node circuit is taken as an object, and power transmission line planning is respectively carried out according to the characteristics of two application scenes. The line cost is set to be 10 ten thousand yuan/kilometer, the mean time for repairing the fault is 8h, the line fault rate is 0.09 times/(km & a), and the unit loss cost is 25 yuan/(kWh & h). The number of selected bees and observed bees is 40, the number of populations is 200, and the number of optimization iterations is 200.
For the residential area, the voltage level is 110V, the importance degree of the load obtained by the formula (4) is 0.088, the initial weights of the economic cost and the reliability cost are respectively determined to be 0.5 and 0.5, and the route planning scheme is optimized to obtain the optimal scheme as shown in fig. 4.
For an industrial park mainly comprising industrial loads, the voltage level is 750V, the importance degree of each load is 0.243, the initial weights of the economic cost and the reliability cost are determined to be 0.4 and 0.6 respectively, the route planning scheme is optimized, and the optimal scheme is obtained as shown in fig. 5.
The planning results for both application scenarios are shown in table 2. It can be seen that the reliability cost of an industrial park is low, which is consistent with its high reliability requirements.
TABLE 2 planning results in two application scenarios
Figure BDA0002448718960000131
As can be seen from table 2 and fig. 4, the economic cost in the residential area scene is a large proportion, so the optimal planning scheme has high economic efficiency and simple wiring.
As can be seen from table 2 and fig. 5, the optimal planning scheme has not only certain economic efficiency but also high reliability, so that the comprehensive cost is not very high, and meanwhile, the wiring mode of the optimal planning scheme is in a ring type wiring mode, which is more complicated than that of a residential area.
As a comparison of the algorithm before and after the improvement, the griewank function is selected for optimization, and the results are shown in fig. 6 and 7. It can be seen that the improved algorithm (as shown in fig. 7) uses a smaller number of iterations, about 87, to obtain the optimal solution, and the optimal value is lower.
The optimization algorithm of the objective function of the comprehensive cost of the direct-current power distribution network adopts an artificial bee colony algorithm and utilizes the artificial bee colony algorithm improved by the maximum product and the minimum product to carry out optimization. The IEEE standard 14 node circuit is placed in two application scenes for example analysis, and the obtained result meets the requirements of related scenes. The comparative analysis of the artificial bee colony algorithm before and after the improvement shows that the method provided by the invention can obtain a better planning result while improving the convergence rate.
Thus, it should be appreciated by those skilled in the art that while a number of exemplary embodiments of the invention have been illustrated and described in detail herein, many other variations or modifications consistent with the principles of the invention may be directly determined or derived from the disclosure of the present invention without departing from the spirit and scope of the invention. Accordingly, the scope of the invention should be understood and interpreted to cover all such other variations or modifications.

Claims (7)

1. A method for calculating the comprehensive cost of a direct-current power distribution network is characterized by comprising the following steps:
determining an economic index, wherein the economic index parameters comprise line construction cost and network loss cost;
determining a reliability index, wherein the reliability index parameters comprise the importance degree of a load, the load size and the average power shortage duration of the load;
determining an objective function of the comprehensive cost according to the economic index and the reliability index;
and optimizing the objective function by using constraint conditions.
2. The method for calculating the comprehensive cost of the direct-current power distribution network according to claim 1, characterized by comprising the following steps:
the economic index calculation formula is as follows: cj＝CB+ClPloss；
Wherein, CBFor line construction costs, ClIs unit loss cost, PlossIs the line loss of the dc distribution network.
3. The method for calculating the comprehensive cost of the direct current distribution network according to claim 2, characterized in that: line loss P of the DC power distribution networklossThe calculation formula of (2) is as follows:
Figure FDA0002448718950000011
wherein n is the number of the bus bars, ViA direct voltage, V, for the bus ijDC voltage, y, for bus jijIs the dc conductance between bus i and bus j.
4. The method for calculating the comprehensive cost of the direct-current power distribution network according to claim 1, characterized by comprising the following steps:
the calculation formula of the reliability index is as follows: ck＝γ·tloss·Im·P；
Wherein, CkCost equivalent to reliability; gamma is a conversion coefficient; t is tlossThe average power failure time is related to the power failure rate and the repair time of the fault; i ismThe load is the important degree, and is mainly measured by the economic loss caused by the power failure of the load; p is the load size.
5. The method for calculating the comprehensive cost of the direct-current power distribution network according to claim 1, characterized by comprising the following steps:
the objective function is: min C ═ w1Cj+w2Ck；
Wherein C is the overall cost, w1、w2Are weight coefficients.
6. The method for calculating the comprehensive cost of the direct current distribution network according to claim 5, wherein the method comprises the following steps: the calculation formula of the weight coefficient is as follows:
Figure FDA0002448718950000021
Figure FDA0002448718950000022
wherein α is an adjustment coefficient, determined according to reliability cost and economic cost values, wi0Is the initial weight.
7. The method for calculating the comprehensive cost of the direct-current power distribution network according to claim 1, characterized by comprising the following steps: the constraints include connectivity constraints and overload constraints.
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