CN108256723B

CN108256723B - Economic benefit evaluation method for accessing coal-to-electricity into power grid and terminal equipment

Info

Publication number: CN108256723B
Application number: CN201711205165.2A
Authority: CN
Inventors: 安佳坤; 贺春光; 邵华; 凌云鹏; 王峰; 李树水; 王颖; 胡诗尧; 赵阳; 齐晓光; 谢晓琳; 刘鹏; 马国真; 胡珀; 樊会丛; 翟广心; 习朋; 韩璟琳; 孙鹏飞; 朱俊栋
Original assignee: State Grid Corp of China SGCC; State Grid Hebei Electric Power Co Ltd; Economic and Technological Research Institute of State Grid Hebei Electric Power Co Ltd
Current assignee: State Grid Corp of China SGCC; State Grid Hebei Electric Power Co Ltd; Economic and Technological Research Institute of State Grid Hebei Electric Power Co Ltd
Priority date: 2017-11-27
Filing date: 2017-11-27
Publication date: 2021-11-30
Anticipated expiration: 2037-11-27
Also published as: CN108256723A

Abstract

The invention is suitable for the technical field of power grid planning, and particularly relates to an economic benefit evaluation method and terminal equipment for accessing coal-to-electricity into a power grid. The method comprises the following steps: acquiring coal power change information of coal-fired users in a coal power change access area, power grid information of the coal power change access area, project planning conditions of the coal power change access area and subsidy policies of the coal power change users and enterprises; judging whether each substation master station in the coal-to-electricity access area can meet the load requirement, obtaining the newly-increased maximum coal-to-electricity load which can be accepted by each substation master network according to the judgment result, and determining the sum of the newly-increased maximum coal-to-electricity loads which can be accessed by each substation in the coal-to-electricity access area; determining the maximum coal-to-electricity scale accessible by each substation in a coal-to-electricity access area, and then determining a scheme to be reconstructed; and finally determining the economic benefit of accessing the coal-to-electricity access to the power grid in the coal-to-electricity access area. After the scheme is adopted, the enthusiasm of enterprises and users for participation is improved, and the smooth implementation of the coal-to-electricity engineering is facilitated.

Description

Economic benefit evaluation method for accessing coal-to-electricity into power grid and terminal equipment

Technical Field

The invention belongs to the technical field of power grid planning, and particularly relates to an economic benefit evaluation method and terminal equipment for accessing coal-to-electricity into a power grid.

Background

In recent years, the atmospheric pollution such as haze and the like is severe, the life quality and comfort level of people are seriously influenced, a large amount of scattered coal is directly used for combustion without being subjected to clean treatment through research, so that a large amount of atmospheric pollutants are discharged, the consumption of a large amount of scattered coal and fuel oil is one of main factors causing severe haze, and therefore, the electric energy substitution work such as coal-to-electricity conversion is developed in China.

However, the coal-to-electricity work is a huge project, the smooth implementation of the coal-to-electricity work needs the coordination and coordination of governments, enterprises and users, and for the enterprises and the users, the economic benefit of the coal-to-electricity investment directly influences the participation enthusiasm.

Disclosure of Invention

In view of this, embodiments of the present invention provide a method and a terminal device for evaluating economic benefits of a coal-to-electricity access grid, so as to solve the problem that in the prior art, no good scheme is available to directly determine economic benefits of a coal-to-electricity implementation scheme, which affects the coordination enthusiasm of users, enterprises and governments and is not beneficial to smooth implementation of coal-to-electricity work.

In a first aspect of the embodiments of the present invention, a method for evaluating economic benefits of a coal-to-electricity access power grid is provided, where the method includes: acquiring coal power change information of coal-fired users in a coal power change access area, power grid information of the coal power change access area, project planning conditions of the coal power change access area and subsidy policies of the coal power change users and enterprises;

judging whether each substation master station in the coal-switching access area can meet the load requirement according to the coal-switching information of the coal-fired users in the coal-switching access area and the power grid information of the coal-switching access area, and obtaining the newly-increased maximum coal-switching load which can be accepted by each substation master network according to the judgment result;

determining the sum of newly-increased maximum coal-to-electricity loads accessible to substations in the coal-to-electricity access area according to the coal-to-electricity information of coal-fired users in the coal-to-electricity access area and the power grid information of the coal-to-electricity access area;

determining the maximum coal power change scale accessible by each substation in the coal power change access area according to the sum of the newly-increased maximum coal power change load receivable by each substation main network and the newly-increased maximum coal power change load accessible by each substation;

planning a matched power grid according to the maximum coal power transformation scale, and determining a scheme to be transformed;

determining the construction investment amount, the operation investment amount and the dredging electricity price of the coal-to-electricity-change access area according to the scheme to be reformed and subsidy policies of the coal-to-electricity-change users and enterprises;

and determining the electric network electricity price subsidy investment recovery period of the coal-to-electricity access area according to the construction investment amount, the operation investment amount and the dredging electricity price, and determining the economic benefit of the coal-to-electricity access area for accessing the coal-to-electricity access to the electric network.

In a second aspect of the embodiments of the present invention, there is provided an economic benefit evaluation apparatus for accessing a coal-to-electricity network, including: the coal-to-electricity information acquisition module is used for acquiring coal-to-electricity information of coal-fired users in a coal-to-electricity access area, power grid information of the coal-to-electricity access area, project planning conditions of the coal-to-electricity access area and subsidy policies of the coal-to-electricity users and enterprises;

the maximum coal-to-electricity load determining module is used for judging whether each substation master station in the coal-to-electricity access area can meet the load requirement according to the coal-to-electricity information of the coal-fired user in the coal-to-electricity access area and the power grid information of the coal-to-electricity access area, and obtaining the newly-added maximum coal-to-electricity load which can be accepted by each substation master network according to the judgment result;

the substation determining module is used for determining the sum of newly-increased maximum coal-to-electricity loads accessible to substations in the coal-to-electricity access area according to the coal-to-electricity information of coal-fired users in the coal-to-electricity access area and the power grid information of the coal-to-electricity access area;

the maximum coal power change scale determining module is used for determining the maximum coal power change scale which can be accessed by each substation in the coal power change access area according to the sum of the newly-increased maximum coal power change load which can be accepted by the main network of each substation and the newly-increased maximum coal power change load which can be accessed by each substation;

the to-be-modified scheme determining module is used for planning a matched power grid according to the maximum coal to-be-modified scale and determining a to-be-modified scheme;

the dredging electric price determining module is used for determining the construction investment amount, the operation investment amount and the dredging electric price of the coal-to-electricity access area according to the scheme to be reformed and subsidy policies of the coal-to-electricity users and enterprises;

and the economic benefit determining module is used for determining a subsidy investment recovery period of the power grid electricity price of the coal-to-electricity access area according to the construction investment amount, the operation investment amount and the dredging electricity price, and determining the economic benefit of the coal-to-electricity access area for accessing the coal-to-electricity to the power grid.

In a third aspect of the embodiments of the present invention, there is provided an economic benefit evaluation terminal device for accessing a coal-to-electricity network, including a memory, a processor, and a computer program stored in the memory and executable on the processor, where the processor implements the method according to the first aspect when executing the computer program.

In a fourth aspect of the embodiments of the present invention, there is provided a computer-readable storage medium storing a computer program, which when executed by a processor implements the method of the first aspect as described above.

After the scheme is adopted, a village user determining method for coal-to-electricity-switching access, investment composition analysis, dredging electrovalence and investment recovery period calculation methods are determined, decision basis is provided for scientifically making a coal-to-electricity-switching implementation range and subsidy policies, the participation enthusiasm of enterprises and users is improved, and smooth implementation of coal-to-electricity-switching projects is facilitated.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.

Fig. 1 is a flowchart illustrating steps of a method for evaluating economic benefits of a coal-to-electricity access grid according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of an economic benefit evaluation apparatus for accessing coal-to-electricity into a power grid according to a second embodiment of the present invention;

fig. 3 is a schematic diagram of an economic benefit evaluation terminal device for accessing coal-to-electricity into a power grid according to a fourth embodiment of the present invention.

Detailed Description

In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.

In order to explain the technical means of the present invention, the following description will be given by way of specific examples.

Example one

As shown in fig. 1, a flowchart of steps of the method for evaluating economic benefits of a coal-to-electricity access grid according to an embodiment of the present invention is detailed as follows:

step S101, obtaining coal power change information of coal-fired users in a coal power change access area, power grid information of the coal power change access area, project planning conditions of the coal power change access area, and subsidy policies of the coal power change users and enterprises.

Specifically, relevant information of users, enterprises, governments and the like in the coal-to-electricity access area is collected, and the relevant information comprises the current power supply capacity of a regional power grid, the load difference in winter and summer, the current load, the depreciation rate of enterprise equipment, the operation cost coefficient, the loan benchmark interest rate, the line loss rate and the project planning condition of the coal-to-electricity access area, and the electricity utilization characteristics, the non-heating season use and the use rule of the users in the peak valley period of the coal-to-electricity equipment are obtained.

The method for acquiring the coal-to-electricity information of the coal-fired users in the coal-to-electricity access area comprises the steps of counting the types, the electricity utilization powers, the configuration modes and the number of used coal-to-electricity devices for the intentional centralized coal-to-electricity users. And counting the village number, the household number and the type and the number of the electric heating equipment of each household of the target area for the distributed coal-to-electricity users. The project planning conditions of the coal-to-electricity access area comprise construction scale, investment, newly added capacity and production period.

And S102, judging whether each substation master station in the coal-to-electricity access area can meet the load requirement according to the coal-to-electricity information of the coal-fired users in the coal-to-electricity access area and the power grid information of the coal-to-electricity access area, and obtaining the newly-added maximum coal-to-electricity load which can be accepted by each substation master network according to the judgment result.

Specifically, the method comprises the steps of measuring and calculating the scale from high voltage to low voltage coal power transformation, carrying out load flow calculation from 500kV, 220kV, 110kV to 35kV voltage level by voltage level according to the current power supply capacity, the load difference in winter and summer and the current load of a power grid in a coal power transformation access area and the overall distribution condition of the coal power transformation, measuring and calculating whether each transformer substation can meet the load requirement, and obtaining the newly-increased maximum coal power transformation load which can be accepted by each main network of each transformer substation according to the judgment result.

And S103, determining the sum of newly-increased maximum coal-to-electricity loads accessible to substations in the coal-to-electricity access area according to the coal-to-electricity information of the coal-fired users in the coal-to-electricity access area and the power grid information of the coal-to-electricity access area.

And step S104, determining the maximum coal-to-electricity scale accessible by each substation in the coal-to-electricity access area according to the sum of the newly-increased maximum coal-to-electricity load receivable by each substation main network and the newly-increased maximum coal-to-electricity load accessible by each substation.

Specifically, determining village and house from bottom to top, calculating the newly-added load condition allowed to be accommodated one by one according to the current load of each 10kV outgoing line of the substation, the load difference in winter and summer, the maximum allowable current-carrying capacity and the like, in combination with the number of villages and the number of houses in 10kV lines, comparing the newly-added load condition with the maximum allowable load of the substation, and further determining the maximum coal-to-electricity load capable of being accommodated under the condition that the technical conditions allow:

P_c.max＝min(P₅₀₀,P₂₂₀,P₁₁₀,P₃₅,∑P_10.i)；

wherein, P_10.i＝P_i.N-P_i.net-P_i.oper-εP_10.i＝P_i.N-P_i.net-P_i.oper-εP_10.i＝P_i.N-P_i.net-P_i.oper-εP_10.i＝P_i.N-P_i.net-P_i.operEpsilon is the newly increased maximum coal-to-electricity load of each substation determined by load flow calculation; considering that 110kV and 35kV transformer stations are both in a radiation type network structure, in engineering application, P can be calculated according to transformer capacity, current load, load difference in winter and summer, transformer capacity margin and the like_10.i＝P_i.N-P_i.net-P_i.operEpsilon is the coal-to-electricity load each 10kv substation line is allowed to accept.

P_10.i＝P_i.N-P_i.net-P_i.oper-ε；

P_i.NMaximum allowed transmission capacity for each line; p_i.netLoad for each line status; p_i.operThe load difference in winter and summer for the users in the line, if P_i.netAnd P_i.operAnd the load can not be obtained, and the maximum load of the line in winter can be used for replacing the load. Epsilon is the transmission capacity margin of the line, and can be considered as 20% -30% of the maximum capacity of the line.

Considering that the power supply ranges of the transformer substations of different voltage classes are different greatly, in practical application, the upper and lower coordinated implementation scales can be compared step by step and determined.

Regional village-determining user for changing coal into electricity size allowed to be received by each line

And final coal to electricity scale (N)_last) The following were used:

N_last＝∑N_i。

and S105, planning a matched power grid according to the maximum coal power change scale, and determining a scheme to be changed.

Specifically, the matching power grid planning is carried out according to the maximum coal-to-electricity scale, and the initial implementation scale of coal-to-electricity is determined with the aim of optimal environmental benefit. And (3) carrying out coal power change on all scattered coal users and intentional centralized users in the target area, measuring and calculating the newly added load of the coal power change, and calculating the power balance condition in the target area. The method comprises the steps of taking technical feasibility as a target, analyzing the maximum coal-to-electricity load which can be accepted by the target area according to power supply engineering projects built and planned in the target area and by combining the power grid construction capacity and the power balance condition in the target area, and determining the maximum coal-to-electricity scale which can be accepted. And if the budget of at least one of the government, the power supply enterprise and the users exceeds the corresponding threshold, reducing the initial implementation scale of coal-to-electricity conversion, returning to all scattered coal users and intentionally centralized users in the target area to implement coal-to-electricity conversion, measuring and calculating the newly increased load of coal-to-electricity conversion, and calculating the power balance condition in the target area until determining the scheme to be converted.

And S106, determining the construction investment amount, the operation investment amount and the dredging electric price of the coal-to-electricity access area according to the scheme to be reformed and subsidy policies of the coal-to-electricity users and enterprises.

And S107, determining a subsidy investment recovery period of the power grid electricity price of the coal-to-electricity access area according to the construction investment amount, the operation investment amount and the dredging electricity price, and determining the economic benefit of the coal-to-electricity access area for accessing the coal-to-electricity to the power grid.

In addition, in a specific example, the acquiring coal-to-electricity information of the coal-fired user in the coal-to-electricity access area includes:

the power utilization characteristics of the coal-to-electricity equipment in the coal-to-electricity access area during peak-valley periods, the use in non-heating seasons and the use rule of users.

The power grid information of the coal-to-electricity access area comprises: the current power supply capacity of each voltage class power grid in the coal-to-electricity access area, the increased load of the coal-to-electricity access area and the load difference of winter and summer are poor.

The project planning condition of the coal-to-electricity access area comprises the following steps: and acquiring the construction scale, investment, newly added capacity and production period of the engineering project under construction and planning in the coal-to-liquids access area.

In addition, in a specific example, the determining whether each substation master station in the coal-to-electricity access area can meet the load demand according to the coal-to-electricity information of the coal-fired user in the coal-to-electricity access area and the grid information of the coal-to-electricity access area, and obtaining a newly-added maximum coal-to-electricity load that each substation master network can accept according to the determination result includes:

according to the current power supply capacity of each voltage class power grid in the coal-to-electricity access area, the increased load of coal-to-electricity and the load difference in winter and summer, in combination with the electricity utilization characteristics of the coal-to-electricity equipment in the coal-to-electricity access area during the peak-valley period, the use in non-heating seasons and the use rule of users, carrying out load flow calculation from 500kV, 220kV, 110kV and 35kV from high voltage to low voltage by voltage class respectively, judging whether each substation master station in the coal-to-electricity access area can meet the load demand, and obtaining the newly increased maximum coal-to-electricity load which each substation master network can accept according to the judgment result.

In addition, in a specific example, the determining, according to the coal power change information of the coal-fired user in the coal power change access area and the grid information of the coal power change access area, the sum of newly-increased maximum coal power change loads accessible to each substation in the coal power change access area includes:

determining newly increased maximum coal-to-electricity loads accessible to substations in the coal-to-electricity access area one by one according to the current power supply capacity of each voltage class power grid in the coal-to-electricity access area, the increased load of coal-to-electricity and the difference of winter and summer loads in combination with the electricity utilization characteristics of the coal-to-electricity equipment in the coal-to-electricity access area during the peak-valley period, the use in non-heating seasons and the use rule of users;

and adding and summing the newly-increased maximum coal-to-electricity load accessible to each substation to obtain the sum of the newly-increased maximum coal-to-electricity load accessible to each substation.

In a specific example, the determining the construction investment amount, the operation investment amount and the grooming power price of the coal-to-electricity access area according to the scheme to be reformed and the subsidy policies of the coal-to-electricity users and enterprises includes:

the construction investment amount comprises the power grid investment of each voltage class

Land acquisition and removal expense

Investment for purchasing and installing user heating equipment and preserving heat of house (N)_lastF_user). Wherein, each level of power grid construction andland acquisition and removal are mainly undertaken by power grid enterprises; the purchase and installation of heating equipment and the heat preservation and repair of houses are mainly undertaken by users. And the government coal-to-electricity construction investment refers to subsidy expenses for users, matching power grids and expropriation and removal.

The construction investment amount is as follows:

wherein, F^basFor the construction investment amount,

Investment money is respectively established for the coal power change of the government, the user and the power grid company, wherein the lower corner mark G represents the government, the U represents the user, the grid represents the power grid company,

wherein the content of the first and second substances,

for the investment of the power grid of each voltage class,

cost for expropriating land, F_userThe investment for purchasing and installing household heating equipment and preserving and repairing houses is realized;

subsidizing expenses for households, N_lastImplementing the number of the users for the finally determined coal-to-electricity change;

the subsidy proportion for the construction of the power grid matched with each voltage class,

the subsidy proportion is removed for land acquisition; v represents a voltage class, i represents a serial number of each voltage class, and i is 500kV when i is 1; when i is 2, the voltage is 220 kV; when i is 3, the voltage is 110 kV; 35kV when i is 4; when i is 5, 10kV or less;

the running investment amount is

Wherein, F^operIn order to operate the amount of investment,

the utility model provides the electricity price subsidy and the electric quantity subsidy for the government to the coal-to-electricity users,

for the operation investment of the power grid enterprise,

the operating cost is the user;

wherein Q is_userAnd

for each heating season, the electricity consumption and subsidy electricity quantity of the household, N_lastThe Price is the normal electricity charge when the coal power change is not carried out;

the electricity price is changed for implementing coal.

For the operation investment amount, the peak-valley electricity price is executed on the electric heating users, the electricity price at the valley section is lower than the normal electricity price, and the income of a power grid enterprise is reduced under the same electricity consumption. This part of the cost is equivalent to the operational investment of the power grid enterprise. The government provides electricity price subsidies and electricity quantity subsidies for users who change coal into electricity. The government changes the coal into the number of the electricity households and subsidies the electricity quantity for every household according to the annual operating cost

Electricity price for changing coal into electricity

The operating cost of the user is the electricity charge per heating season.

The primary dredging electrovalence is:

P_NT＝P_D+P_op+P_in+P_ga；

wherein, P_NTFor the primary dredging of the electricity price, P_DFor depreciation, P_opFor operating maintenance fees, P_inInterest in loan for coal-to-electricity investment, P_gaThe corresponding permitted income is invested for changing coal into electricity;

wherein r is_dThe annual aging rate; q is annual electric quantity sold by enterprises; k is a radical of_oThe operating cost corresponding to a unit asset; l is the total loan amount, r₁The loan interest rate is more than five years, the investment is generally 80 percent (capital fund is 20 percent) for electric power enterprises, A is the repayment age limit,

investment amount, P, for coal-to-electricity construction of grid companies_cThe method is characterized in that the method provides the following permitted income for the fund in the coal-to-electricity investment:

r_ggranting profitability, ρ, for a business_sPaying tax rate for enterprise, generally 25%, P_lThe method comprises the following steps of (1) providing the income for paying the occupied funds in the loan every year in the coal-to-electricity investment:

after considering the factors of enterprise business tax, value-added tax and city maintenance and construction tax, the leading electricity price is

P_T＝(1+ρ_o)P_NT，ρ_oFor enterprise comprehensive tax rate, P_NTThe primary dredging electrovalence is obtained.

In addition, in a specific example, determining a grid electricity price subsidy investment recovery period of the coal-to-electricity access area according to the construction investment amount, the operation investment amount and the dredging electricity price, and determining economic benefits of the coal-to-electricity access area coal-to-electricity access grid comprises:

the power grid power price subsidy investment recovery period is the time when the accumulated net cash flow is 0, namely the power grid power price subsidy investment recovery period meets the following requirements:

wherein, CI_tFor annual net cash inflow, CO_tFor each year net cash inflow value, dr is the fund withdrawal rate; t is the year of investment recovery, and T is the investment recovery period;

I_QN_lastQ_userchange of net cash inflow value to coal for each year into electricity sales revenue, P_NThe XQ is the subsidy income of government dredging electric price;

CI_t＝P_N×Q+I_QN_lastQ_user；

wherein Q is the power sold by the company; q_userFor each heating season, I_QElectric power profit, N, for changing grid enterprise coal to electric power_lastImplementing the number of the users for the finally determined coal-to-electricity change;

wherein, P_sAverage purchase price for the enterprise, P_bFor average power selling rate of enterprises, L_ossThe average line loss rate of the enterprise;

where N is the year in which the cumulative net cash flow first appears positive, i.e., N satisfies the following relationship:

example two

As shown in fig. 2, a schematic structural diagram of an economic benefit evaluation device for accessing coal-to-electricity to a power grid provided in an embodiment of the present invention is detailed as follows:

the coal-to-electricity information acquisition module 201 is configured to acquire coal-to-electricity information of a coal-fired user in a coal-to-electricity access area, power grid information of the coal-to-electricity access area, project planning conditions of the coal-to-electricity access area, and subsidy policies of the coal-to-electricity users and enterprises.

The maximum coal-to-electricity load determination module 202 is configured to determine whether each substation master station in the coal-to-electricity access area can meet a load demand according to coal-to-electricity information of a coal-fired user in the coal-to-electricity access area and power grid information of the coal-to-electricity access area, and obtain a newly-added maximum coal-to-electricity load that each substation master network can accept according to a determination result.

And the substation determining module 203 is configured to determine the sum of newly increased maximum coal-to-electricity loads accessible to substations in the coal-to-electricity access area according to the coal-to-electricity information of the coal-fired users in the coal-to-electricity access area and the power grid information of the coal-to-electricity access area.

And a maximum coal to power conversion scale determining module 204, configured to determine a maximum coal to power conversion scale accessible to each substation in the coal to power conversion access area according to a sum of a newly-increased maximum coal to power conversion load receivable by the main network of each substation and a newly-increased maximum coal to power load accessible to each substation.

And the to-be-modified scheme determining module 205 is configured to perform matching power grid planning according to the maximum coal-to-electricity-modification scale, and determine a to-be-modified scheme.

And a grooming power price determining module 206, configured to determine a construction investment amount, an operation investment amount, and a grooming power price of the coal-to-electricity access area according to the scheme to be reformed and subsidy policies of the coal-to-electricity users and enterprises.

And the economic benefit determining module 207 is configured to determine a subsidy investment recovery period of the power grid electricity price of the coal-to-electricity access area according to the construction investment amount, the operation investment amount and the dredging electricity price, and determine economic benefits of the coal-to-electricity access area for accessing the coal-to-electricity access to the power grid.

the power utilization characteristics, the use in non-heating seasons and the use rules of users of the coal-to-electricity equipment in the coal-to-electricity access area during peak-valley periods;

the power grid information of the coal-to-electricity access area comprises: the current power supply capacity of each voltage class power grid in the coal-to-electricity access area, the increased load of the coal-to-electricity access area and the difference between the load in winter and summer;

Further, in a specific example, the grooming power price determination module 206 is further configured to:

the construction investment amount is as follows:

wherein, F^basIn order to build the investment money,

investment money is respectively established for the coal power change of the government, the user and the power grid company;

wherein the content of the first and second substances,

for the investment of the power grid of each voltage class,

the running investment amount is

Wherein, F^operIn order to operate the amount of investment,

for the operation investment of the power grid enterprise,

the operating cost is the user;

wherein Q is_userAnd

for each heating season, the electricity consumption and subsidy electricity quantity of the household, N_lastThe number of the implementing households for changing the coal into electricity is finally determined, and the normal electricity charge is obtained when the coal is not changed into electricity;

changing the electricity price for implementing coal;

the primary dredging electrovalence is:

P_NT＝P_D+P_op+P_in+P_ga；

wherein r is_dThe annual aging rate; q is annual electric quantity sold by enterprises; k is a radical of_oThe operating cost corresponding to a unit asset; l is total loan amount, A is repayment age, r₁The loan interest rate is more than five years,

r_ggranting profitability, ρ, for a business_sPaying tax rates for enterprises, P_lThe method comprises the following steps of (1) providing the income for paying the occupied funds in the loan every year in the coal-to-electricity investment:

Further, in a specific example, the economic benefit determination module 207 is further configured to:

CI_t＝P_N×Q+I_QN_lastQ_user(ii) a Wherein Q is the power sold by the company; q_userFor each heating season, I_QElectric power profit, N, for changing grid enterprise coal to electric power_lastImplementing the number of the users for the finally determined coal-to-electricity change;

EXAMPLE III

The specific example of the economic benefit method for accessing the coal-to-electricity to the power grid provided by the embodiment of the invention comprises four parts of status data collection, coal-to-electricity village confirmation, matching power grid planning and economic benefit evaluation. The method comprises the following specific steps:

collecting current data:

taking a power distribution network planning work for 2016 coal-to-electricity access in a certain area of Hebei province as an example, the actual situation of the area determines the depreciation rate r of an enterprise_d5%, operating cost coefficient k_o2.5%, and integrated tax rate about rho_o1.187, according to loan year A15 years, loan standard interest rate r₁4.9 percent, the average electricity purchasing cost is 0.356 yuan/kWh, the comprehensive line loss rate is 7.6 percent, and the electricity selling amount is 1585 hundred million kWh. The current value coefficient 0.9259 is calculated according to the discount rate of 8%. At present, 1 500KV transformer substation exists in the area, and the capacity of 225MVA is configured for changing coal into electricity; 8 220KV transformer substations with capacity of 294 MVA; and 28 seats of a 110 kilovolt substation with the capacity of 216 MVA. At present, the methodThe total of users burning coal in the area is 1480 villages and 70.4 ten thousand households, the maximum load of the area is 117 ten thousand kW, the maximum load difference in winter and summer is 25 ten thousand kW, and the natural growth load of the users changing coal into electricity is estimated to be 21 ten thousand kW.

Coal-to-electricity village determination with high-low voltage coordination:

the measurement and calculation of the scale of changing coal into electricity from top to bottom are carried out, 1480 villages and 70.4 ten thousand households of users burning coal in the area are totally calculated, and the newly increased load is estimated to be 176.8 ten thousand kilowatts. Taking a 220kV power grid as an example, according to the overall distribution situation of the number of coal-to-electricity-changing villages in each county area, newly-added coal-to-electricity-changing loads in each county area are predicted, and 220kV power grid load flow calculation is carried out by combining the distribution points of 220kV transformer substations, the main transformer capacity, the large-load operation mode in winter, the current load situation and the like.

According to the calculation result, if the coal is changed into electricity in all areas, 2 220kV stations in the area cannot meet the requirement, and 1 220kV transformer substation is heavily overloaded, and newly-increased 220kV distribution points need to be considered. Under the condition of the distribution of the existing transformer substations, the coal-to-electricity load P which is allowed to be accepted by each 220kV transformer substation in the region is calculated₂₂₀In total sum to sigma P₂₂₀93.3 ten thousand kilowatts, about 37.2 ten thousand households.

Similarly, the power supply capacity of the 500kV transformer substation can meet the power utilization requirement of all regional coal-to-electricity implementation, namely P₅₀₀176.8. Comparison P₅₀₀Sum sigma P₂₂₀The maximum allowable admission load for which the main network can coordinate is 93.3 kilo-kilowatts.

The village is confirmed from bottom to top, taking a certain 110kV transformer substation in an area as an example, the capacity of a No. 1 main transformer is 3.15 ten thousand volt-ampere, the maximum load in 2016 is 1.007 ten thousand kilowatts in winter, the power supply margin is considered according to the fact that the load rate of the main transformer does not exceed 75%, and the accessible load is 3.15 x 0.75-1.007 which is 1.36 ten thousand kilowatts and is about 3542 households. Similarly, the 2# main transformer can receive 1.89 ten thousand kilowatts of electric heating, the number of households is 4927, and the power supply capacity P of the transformer substation₁₁₀3.25 kilo-kilowatts, about 8469 households.

As shown in table 1, the coal-to-electricity utility line carried by the substation is 4, and taking the 511 line of the main transformer No. 1 as an example, the safety current of the line is 275 amperes, the maximum load current in 2016 winter is 50 amperes, the power supply margin is considered according to the condition that the load rate of the line does not exceed 80%, and the accessible load is (275 × 0.8-50) 10 × 1.732 × 2946 kw, and about 767 households. Similarly, the number of coal-to-electricity subscribers allowed to be admitted by the remaining lines is calculated.

TABLE 1 receivable electricity heating household number calculation

Finally, the scale is determined, and the coal-to-electricity load Sigma P can be received by all lines in total_10.iAt 1.22 kilowatts. Due to sigma P_10.i<P₁₁₀The maximum allowable coal to electricity load for distribution network coordination available is 1.22 ten thousand kilowatts, which is about 3182 households. Similarly, other 110kV and 35kV substations are available with the maximum allowable load capacity.

And accumulating the 110kV allowable admission loads in the same 220kV power supply area, and comparing the 110kV allowable admission loads with the main network coordinated allowable admission load to obtain the main and distribution network coordinated maximum allowable admission capacity. This area is 10.17 ten thousand households. If the allowable admission load coordinated by the main network and the distribution network is consistent with the maximum admission load of each line, the condition of residents in each line is the village-to-user-determining scale; and if the maximum allowable admission load coordinated by the main network and the distribution network is less than the maximum admission load of each line, proportionally distributing and determining the village determining user condition according to the maximum admission capacity of each line.

Planning a matched power grid, developing the matched power grid planning according to the implementation scale of coal power transformation and the condition of determining villages and households, adding and transforming 11 new transformer substations, and adding 187 thousands volt-ampere voltage of coal transformation capacity; 2588 distribution transformers are newly added, and 96.2 ten thousand volt-ampere capacity is newly added. The investment of the matched power grid is about 29.48 hundred million. Wherein, the investment of 500KV, 220KV, 110KV and 10KV and below power grids is respectively 2.13, 4.09, 3.5 and 18.61 million yuan, and the investment of 1.15 million yuan is expropriately removed.

And (3) evaluating economic benefits:

analyzing the investment composition, if the electrical heating equipment is purchased by 1 ten thousand yuan per household and the house heat preservation and repair is 1 ten thousand yuan per household, measuring and analyzing the conditions that the maximum subsidy amount of the electrical heating equipment of each household does not exceed 7400 yuan,

in the aspect of construction investment, the total investment is 39.65 billion yuan. Wherein, the construction investment of the matched power grid is 29.48 million yuan, and the purchasing and installation of the heating equipment is 10.17 million yuan. From the capital source, government funding is 7.53 million yuan, user funding is 2.64 million yuan, and enterprise funding is 29.48 million yuan. If 20% of the investment in the central budget of a matching power grid (without expropriate removal) of 110 kilovolt and below is strived, the central capital is 4.42 million yuan, and the power grid company invests 25.06 million yuan.

In the aspect of operation investment, if an electric heating user executes low valley electricity price of 0.31 yuan/kilowatt hour in the heating season, wherein the government subsidizes 0.2 yuan/kilowatt hour, and the user pays 0.11 yuan/kilowatt hour, the government subsidizes about 2.03 million yuan each year according to the calculation of 10000 kilowatt hours in 10.17 ten thousand households and heating seasons, and the user undertakes 1.12 million yuan. According to the calculation of 0.31 yuan/kilowatt hour of the residential electric heating valley section and 0.21 yuan/kilowatt hour of the difference between the electricity price of the residential electricity consumption and 0.52 yuan/kilowatt hour, the power grid company needs to operate and subsidize 2.14 million yuan each year.

Calculating the dredging electrovalence:

determining the depreciation rate r of the enterprise according to the actual situation of the area_d5%, operating cost coefficient k_o2.5%, and integrated tax rate about rho_o1.187, according to loan year A15 years, loan standard interest rate r₁4.9%, permitted yield r_gIf the center gives 110KV and below 20% subsidies to the matching power grid, the dredging price is 0.25 min/degree; if the center does not provide subsidies for the enterprise, the dredging price is 0.29 min/degree.

Calculating the investment recovery period:

and determining the average electricity purchasing cost of 0.356 yuan/kWh, the comprehensive line loss rate of 7.6% and the electricity sales amount of 1585 hundred million kWh according to the actual condition of a regional power grid. According to the calculation of the discount rate of 8 percent, the present value coefficient of 0.9259 and 4000kWh per heating season of each household, the unit marginal loss is 0.008 yuan/kWh, and if the power transmission and distribution price is not dredged, the power is changed for each household and the power is sold 32 yuan each year, so that enterprises cannot recover the cost.

If the center gives 110KV and below to the enterprise 20% subsidy of the matching power grid, and the dredging electric price is 0.26 min/degree, and the investment recovery period is 8.2 years. If the investment in the central budget can not be obtained and the investment is conducted by 0.29 min/degree, the calculation parameters are the same as above, and the investment recovery period is 7.9 years.

Example four

As shown in fig. 3, a schematic diagram of an economic benefit evaluation terminal device for accessing a coal-to-electricity network provided in an embodiment of the present invention is shown, where the economic benefit evaluation terminal device 3 for accessing a coal-to-electricity network in the embodiment includes: a processor 30, a memory 31 and a computer program 32 stored in said memory 31 and operable on said processor 30, such as an economic benefit assessment program for coal-to-electricity access to a power grid. The processor 30, when executing the computer program 32, implements the steps in each of the above-described embodiments of the method for assessing economic benefits of coal-to-electricity access to a power grid, such as the steps 101 to 107 shown in fig. 1. Alternatively, the processor 30, when executing the computer program 32, implements the functions of each module/unit in the above-mentioned device embodiments, for example, the functions of the modules 201 to 207 shown in fig. 2.

Illustratively, the computer program 32 may be partitioned into one or more modules/units that are stored in the memory 31 and executed by the processor 30 to implement the present invention. The one or more modules/units may be a series of computer program instruction segments capable of performing specific functions, and the instruction segments are used for describing the execution process of the computer program 32 in the economic benefit evaluation terminal device 3 for accessing the coal-to-electricity network. For example, the computer program 32 may be divided into a synchronization module, a summary module, an acquisition module, and a return module (a module in a virtual device), and each module has the following specific functions:

the method comprises the steps of obtaining coal power change information of coal-fired users in a coal power change access area, power grid information of the coal power change access area, project planning conditions of the coal power change access area and subsidy policies of the coal power change users and enterprises.

And judging whether each substation master station in the coal-to-electricity access area can meet the load requirement according to the coal-to-electricity information of the coal-fired users in the coal-to-electricity access area and the power grid information of the coal-to-electricity access area, and obtaining the newly-increased maximum coal-to-electricity load which can be accepted by each substation master network according to the judgment result.

And determining the sum of newly-increased maximum coal-to-electricity loads accessible to substations in the coal-to-electricity access area according to the coal-to-electricity information of the coal-fired users in the coal-to-electricity access area and the power grid information of the coal-to-electricity access area.

And determining the maximum coal power change scale accessible by each substation in the coal power change access area according to the sum of the newly-increased maximum coal power change load receivable by each substation main network and the newly-increased maximum coal power change load accessible by each substation.

And planning a matched power grid according to the maximum coal power transformation scale, and determining a scheme to be transformed.

And determining the construction investment amount, the operation investment amount and the dredging electricity price of the coal-to-electricity-change access area according to the scheme to be reformed and subsidy policies of the coal-to-electricity-change users and enterprises.

The acquiring of the coal-to-electricity information of the coal-fired user in the coal-to-electricity access area includes:

The judging whether each substation master station in the coal-switching access area can meet the load demand according to the coal-switching information of the coal-fired users in the coal-switching access area and the power grid information of the coal-switching access area, and obtaining the newly-increased maximum coal-switching load which can be accepted by each substation master network according to the judgment result comprises the following steps:

Determining the sum of newly-increased maximum coal-to-electricity loads accessible to substations in the coal-to-electricity access area according to the coal-to-electricity information of the coal-fired users in the coal-to-electricity access area and the power grid information of the coal-to-electricity access area includes:

and determining newly increased maximum coal-to-electricity loads accessible to substations in the coal-to-electricity access area one by one according to the current power supply capacity of each voltage class power grid in the coal-to-electricity access area, the increased load of the coal-to-electricity and the difference of the load in winter and summer, and by combining the electricity utilization characteristics of the coal-to-electricity equipment in the coal-to-electricity access area during the peak-valley period, the use in non-heating seasons and the use rule of users.

The determining the construction investment amount, the operation investment amount and the dredging electrovalence of the coal-to-electricity-change access area according to the scheme to be reformed and subsidy policies of the coal-to-electricity-change users and enterprises comprises the following steps:

the construction investment amount is as follows:

wherein, F^basIn order to build the investment money,

wherein the content of the first and second substances,

for the investment of the power grid of each voltage class,

the subsidy proportion is removed for land acquisition; v represents a voltage class, and i represents the number of each voltage class.

The running investment amount is

Wherein, F^operIn order to operate the amount of investment,

for the operation investment of the power grid enterprise,

the operating cost is the user;

wherein Q is_userAnd

changing the electricity price for implementing coal;

the primary dredging electrovalence is: p_NT＝P_D+P_op+P_in+P_ga；

Wherein, P_NTFor the primary dredging of the electricity price, P_DFor depreciation fees, for operating maintenance fees, P_inInterest in loan for coal-to-electricity investment, P_gaThe corresponding permitted income is invested for changing coal into electricity;

wherein r is_dThe annual aging rate; q is annual electric quantity sold by enterprises; k is a radical of_oThe operating cost corresponding to a unit asset; l is the total loan amount, A is the repayment age limit, the loan interest rate is more than five years,

r_ggranting profitability, ρ, for a business_sPaying tax rates for enterprises，P_lThe method comprises the following steps of (1) providing the income for paying the occupied funds in the loan every year in the coal-to-electricity investment:

Determining a power grid electricity price subsidy investment recovery period of the coal-to-electricity access area according to the construction investment amount, the operation investment amount and the dredging electricity price, wherein the determining of the economic benefit of the coal-to-electricity access area coal-to-electricity access power grid comprises the following steps:

wherein, the average electricity price of the enterprise, P_bFor average power selling rate of enterprises, L_ossThe average line loss rate of the enterprise;

the economic benefit evaluation terminal device 3 for accessing the coal-to-electricity network can be a desktop computer, a notebook computer, a palm computer, a cloud server and other computing devices. The economic benefit evaluation terminal device for the coal-to-electricity access to the power grid can include, but is not limited to, a processor 30 and a memory 31. Those skilled in the art will understand that fig. 3 is only an example of the economic benefit evaluation terminal device 3 of the coal-to-electricity access grid, and does not constitute a limitation to the economic benefit evaluation terminal device 3 of the coal-to-electricity access grid, and may include more or less components than those shown in the figures, or combine some components, or different components, for example, the economic benefit evaluation terminal device of the coal-to-electricity access grid may further include an input-output device, a network access device, a bus, and the like.

The Processor 30 may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic, discrete hardware components, etc. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.

The storage 31 may be an internal storage unit of the economic benefit evaluation terminal device 3 for accessing the coal-to-electricity network, for example, a hard disk or a memory of the economic benefit evaluation terminal device 3 for accessing the coal-to-electricity network. The memory 31 may also be an external storage device of the economic benefit evaluation terminal device 3 for accessing the coal-to-electricity network, for example, a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash Card (Flash Card), or the like, which is equipped on the economic benefit evaluation terminal device 3 for accessing the coal-to-electricity network. Further, the memory 31 may also include both an internal storage unit and an external storage device of the economic benefit evaluation terminal device 3 for accessing the coal-to-electricity network. The memory 31 is used for storing the computer program and other programs and data required by the economic benefit evaluation terminal device for accessing the coal-to-electricity network. The memory 31 may also be used to temporarily store data that has been output or is to be output.

It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-mentioned division of the functional units and modules is illustrated, and in practical applications, the above-mentioned function distribution may be performed by different functional units and modules according to needs, that is, the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-mentioned functions. Each functional unit and module in the embodiments may be integrated in one processing unit, or each unit may exist alone physically, or two or more units are integrated in one unit, and the integrated unit may be implemented in a form of hardware, or in a form of software functional unit. In addition, specific names of the functional units and modules are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working processes of the units and modules in the system may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and reference may be made to the related descriptions of other embodiments for parts that are not described or illustrated in a certain embodiment.

Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.

In the embodiments provided in the present invention, it should be understood that the disclosed apparatus/terminal device and method may be implemented in other ways. For example, the above-described embodiments of the apparatus/terminal device are merely illustrative, and for example, the division of the modules or units is only one logical division, and there may be other divisions when actually implemented, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.

The integrated modules/units, if implemented in the form of software functional units and sold or used as separate products, may be stored in a computer readable storage medium. Based on such understanding, all or part of the flow of the method according to the embodiments of the present invention may also be implemented by a computer program, which may be stored in a computer-readable storage medium, and when the computer program is executed by a processor, the steps of the method embodiments may be implemented. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, usb disk, removable hard disk, magnetic disk, optical disk, computer Memory, Read-Only Memory (ROM), Random Access Memory (RAM), electrical carrier wave signals, telecommunications signals, software distribution medium, and the like. It should be noted that the computer readable medium may contain other components which may be suitably increased or decreased as required by legislation and patent practice in jurisdictions, for example, in some jurisdictions, computer readable media which may not include electrical carrier signals and telecommunications signals in accordance with legislation and patent practice.

The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.

Claims

1. The economic benefit evaluation method for accessing coal-to-electricity into a power grid is characterized by comprising the following steps of:

acquiring coal power change information of coal-fired users in a coal power change access area, power grid information of the coal power change access area, project planning conditions of the coal power change access area and subsidy policies of the coal power change users and enterprises;

determining a power grid electricity price subsidy investment recovery period of the coal-to-electricity access area according to the construction investment amount, the operation investment amount and the dredging electricity price, and determining economic benefits of the coal-to-electricity access area coal-to-electricity access power grid;

the determining the maximum coal-to-electricity scale accessible to each substation in the coal-to-electricity access area according to the sum of the newly-increased maximum coal-to-electricity load receivable by each substation main network and the newly-increased maximum coal-to-electricity load accessible to each substation includes:

according to the current load, the load difference in winter and summer and the maximum allowable current-carrying capacity of each 10kV line of the substation, the number of villages and the number of households of the 10kV line are combined, the newly-increased load condition allowed to be accommodated is measured and calculated one line by one line, and is compared with the maximum allowable load of the substation, and the maximum coal-to-electricity load which can be accommodated under the condition of the permission of technical conditions is determined:

P_c.max＝min(P₅₀₀,P₂₂₀,P₁₁₀,P₃₅,∑P_10.i)；

wherein, P_10.i＝P_i.N-P_i.net-P_i.operEpsilon is the coal-to-electricity load allowed to be received by the ith 10kV substation line; p_i.NMaximum allowed transmission capacity for the ith line; p_i.netThe load is the current load of the ith line; p_i.operThe load difference of the users in winter and summer in the ith line; epsilon is the transmission capacity margin of the ith line; p₅₀₀For coal-to-electricity loads, P, admitted to lines of 500KV substations₂₂₀For coal-to-electricity loads, P, admitted to 220KV substation lines₁₁₀For coal-to-electricity loads, P, admitted to lines of 110KV substations₃₅The method comprises the following steps of changing the coal to electricity load allowed to be accepted by a 35KV transformer substation line; p_c.maxThe maximum coal-to-electricity load which can be accessed by each substation in the coal-to-electricity access area is provided;

the allowable coal-to-electricity scale of each line is as follows:

the final coal-to-electricity scale is N_last＝∑N_i；

Wherein N is_iIndicating the scale of coal to electricity, N, admitted by line i_lastIndicating the final coal-to-electricity scale.

2. The method for evaluating the economic benefit of accessing the coal-to-electricity network according to claim 1, wherein the obtaining the coal-to-electricity information of the coal-fired users in the coal-to-electricity access area comprises:

3. The economic benefit evaluation method for accessing the coal-to-electricity grid according to claim 2, wherein the step of judging whether each substation master station in the coal-to-electricity access area can meet the load demand according to the coal-to-electricity information of the coal-fired user in the coal-to-electricity access area and the grid information of the coal-to-electricity access area, and obtaining a newly-increased maximum coal-to-electricity load receivable by each substation master network according to a judgment result comprises the steps of:

4. The method for evaluating the economic benefit of accessing the coal-to-electricity grid according to claim 3, wherein the determining the sum of newly-increased maximum coal-to-electricity loads accessible to the substation substations in the coal-to-electricity access area according to the coal-to-electricity information of the coal-fired users in the coal-to-electricity access area and the grid information of the coal-to-electricity access area comprises:

5. The method for evaluating the economic benefit of the coal-to-electricity-change access power grid according to claim 1, wherein the determining the construction investment amount, the operation investment amount and the grooming electricity price of the coal-to-electricity-change access area according to the scheme to be reformed and subsidy policies of the coal-to-electricity-change users and enterprises comprises:

the construction investment amount is as follows:

wherein, F^basIn order to build the investment money,

wherein the content of the first and second substances,

for the investment of the power grid of each voltage class,

the subsidy proportion is removed for land acquisition; v represents a voltage class, i represents a serial number of each voltage class;

the running investment amount is

Wherein, F^operIn order to operate the amount of investment,

for the operation investment of the power grid enterprise,

the operating cost is the user;

wherein Q is_userAnd

changing the electricity price for implementing coal;

the primary dredging electrovalence is:

P_NT＝P_D+P_op+P_in+P_ga；

after the factors of enterprise business tax, value-added tax and city maintenance construction tax are considered, the leading electricity price is P_T＝(1+ρ_o)P_NT，ρ_oFor enterprise comprehensive tax rate, P_NTThe primary dredging electrovalence is obtained.

6. The method for evaluating the economic benefit of the coal-to-electricity access grid according to claim 5, wherein the determining the grid electricity price subsidy investment recovery period of the coal-to-electricity access area according to the construction investment amount, the operation investment amount and the mediation electricity price comprises:

CI_t＝P_N×Q+I_QN_lastQ_user；

7. the utility model provides an economic benefits evaluation device that coal changed electricity and inserts electric wire netting which characterized in that includes:

the coal-to-electricity information acquisition module is used for acquiring coal-to-electricity information of coal-fired users in a coal-to-electricity access area, power grid information of the coal-to-electricity access area, project planning conditions of the coal-to-electricity access area and subsidy policies of the coal-to-electricity users and enterprises;

the economic benefit determining module is used for determining a power grid electricity price subsidy investment recovery period of the coal-to-electricity access area according to the construction investment amount, the operation investment amount and the dredging electricity price, and determining economic benefits of the coal-to-electricity access area and the coal-to-electricity access power grid;

the maximum coal-to-electricity scale determining module comprises:

P_c.max＝min(P₅₀₀,P₂₂₀,P₁₁₀,P₃₅,∑P_10.i)；

the allowable coal-to-electricity scale of each line is as follows:

the final coal-to-electricity scale is N_last＝∑N_i；

8. The economic benefit assessment device for accessing coal-to-electricity into a power grid according to claim 7, wherein said obtaining coal-to-electricity information of coal-fired users in a coal-to-electricity access area comprises:

9. An economic benefit evaluation terminal device for a coal-to-electricity access to a power grid, comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that the processor implements the steps of the method according to any one of claims 1 to 6 when executing the computer program.

10. A computer-readable storage medium, in which a computer program is stored which, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 6.