A charging and pricing method and system based on island medium and low voltage distribution network projects

Abstract

The present invention discloses a charging and pricing method and system based on medium and low voltage distribution network projects on islands, comprising a basic module and an adjustment module. The basic module comprises the total investment of the distribution network project and the construction and installation engineering fee. The adjustment module comprises a coefficient adjustment module and a fee adjustment module. The charging and pricing standards of the medium and low voltage distribution network projects on islands are adjusted by adjusting labor costs, material costs, machinery costs, equipment transportation fees, and increasing the island dispatching fees of construction organizations. The charging and pricing standards are classified according to different islands. By constructing the basic module and the adjustment module, the cost of the medium and low voltage distribution network projects on islands is obtained through comprehensive calculation. This method fully considers the natural conditions, geographical location, construction difficulty and other factors of the islands, so that the pricing results are more scientific and reasonable.

Description

Technical Field

[0001] The present invention relates to the technical field of medium and low voltage distribution network engineering, and in particular to a charging and pricing method and system based on island medium and low voltage distribution network engineering. Background Art

[0002] my country is rich in marine resources, with vast sea areas, numerous islands, a large north-south span and convenient foreign exchanges. With the rapid development of economic construction, there are more and more residents on the islands, and the demand for electricity on the islands is increasing year by year. However, the construction environment of island distribution network projects is significantly different from that of land projects, and there is a lack of unified and scientific pricing and calculation standards for marine transportation costs, which makes it impossible to determine related costs, and makes project promotion and auditing difficult, which seriously affects the construction and development of island power grids.

[0003] The existing charging and pricing methods for medium and low voltage distribution network projects on islands have the following drawbacks: At present, medium and low voltage distribution network projects implement the "20kV and below distribution network project construction budget preparation and calculation standards" (2021 edition) and "20kV and below distribution network project budget quotas" (2021 edition) promulgated by the National Energy Administration. The charging standards and quotas are based on the conventional mainland environment and are revised every 5 years. The calculation method and system are designed according to the land construction environment and land engineering difficulty, without considering the particularity and change factors of adding islands. The standard simply stipulates that the sea transportation costs of personnel, equipment, materials and construction machinery for island distribution network projects can be calculated based on actual costs, but does not provide corresponding pricing standards and pricing methods. For this reason, we propose a charging and pricing method and system based on medium and low voltage distribution network projects on islands. Summary of the invention

[0004] The main purpose of the present invention is to provide a charging and pricing method and system based on medium and low voltage distribution network projects on islands, aiming to establish scientific and reasonable investment charging standards for medium and low voltage distribution network projects on islands in Zhuhai. By formulating scientific and reasonable investment charging standards, it is possible to promote the standardized construction of medium and low voltage distribution network projects on islands in Zhuhai, improve power supply reliability and stability, provide reliable energy support for the economic and social development of island areas, and effectively solve the problems in the background technology.

[0005] To achieve the above object, the technical solution adopted by the present invention is:

[0006] A charging and pricing method and system based on island medium and low voltage distribution network projects include a basic module and an adjustment module. The basic module includes the total investment in the distribution network project and the construction and installation project fee, and the adjustment module includes a coefficient adjustment module and a fee adjustment module.

[0007] Furthermore, the total investment in the distribution network project is composed of construction project costs, installation project costs, equipment purchase costs, other costs, basic reserve costs and dynamic costs; the construction and installation project costs are composed of labor costs, material costs, construction machinery usage fees, measures fees, indirect costs, profits, annual price differences and taxes.

[0008] Furthermore, the coefficient adjustment module adjusts the labor costs, material costs, construction machinery usage fees, and equipment purchase costs in the basic module in view of the unique natural environment of the island. By increasing the adjustment coefficient or adjusting the rate, it comprehensively considers the impact of the island environment on the investment in medium and low voltage distribution network projects. The cost adjustment module adjusts the measures costs in the basic module in view of the unique construction environment of the island, and increases the island dispatch fees for construction organizations.

[0009] Further,

[0010] A1. Calculation and charging method of labor costs:

[0011] Labor costs refer to the various expenses incurred by production workers directly engaged in the construction of building installation projects, including basic wages, wage subsidies, auxiliary wages, employee welfare expenses, labor protection expenses for production personnel, etc.

[0012] This calculation and charging method adds the extra expenses of production workers due to the change of construction site from land to island on this basis. And by adding adjustment coefficients, the impact of these factors on the fixed labor cost is considered as a whole. It mainly includes the cost of production workers going on and off the island, subsidies during the period of going on and off the island, labor costs for island workers, island living subsidies, island accommodation costs, and at the same time considers the impact of the special environment of the island on the reduction of construction efficiency.

[0013] a1. Wage subsidy adjustment coefficient P1

[0014] Wage subsidies are defined as price subsidies, coal and gas subsidies, transportation subsidies, and mobile construction allowances issued in accordance with prescribed standards. Because island projects increase the cost of personnel going on and off the island, transportation subsidies should be increased accordingly. The frequency of mobile construction and island prices are also higher than those of land projects, so wage subsidies should be adjusted accordingly. The wage subsidy adjustment coefficient here can be calculated as follows:

[0015] P1=3.51×f×n×10∧(-4)

[0016] Among them: f--the average round-trip fare for the previous year

[0017] n--Number of workers going on and off the island each month

[0018] a2. Auxiliary salary adjustment coefficient P2

[0019] Auxiliary wages refer to the wages of production personnel for non-working days other than the effective construction days per year. They include wages during study and training, wages during job transfer, family visits, vacations, wages for work stoppages due to weather conditions, wages for sick leave within 6 months, and wages during marriage and funeral leave.

[0020] Due to the special geographical environment, island projects require additional wages for personnel during the transfer to the island, wages for work stoppages while waiting for materials and construction tools, wages for work stoppages due to government control and climate, and wages for returning to the mainland to visit relatives or take vacations. The above expenses are mainly related to the development level of the island, the sailing distance, and the island climate. After analysis, the auxiliary wage adjustment coefficient can be calculated according to the following four types of islands.

[0021] After calculation, the auxiliary wage adjustment coefficient P2 can be taken according to the following situations. Among them, the classification of islands can be carried out comprehensively according to the following standards:

[0022] Class I: P2 value is 1.8;

[0023] Class II: P2 value is 1.9;

[0024] Category III: P2 value is 2.0;

[0025] Category IV: The value of P2 is determined through consultation based on actual conditions.

[0026] A2. Adjustment of material costs:

[0027] Material costs refer to the main materials, auxiliary materials, components, semi-finished products, miscellaneous materials consumed during the construction process, as well as the costs of one-time consumable materials and amortized materials during the construction process. If the materials need to be transported from the centralized storage warehouse to the designated location of the construction site, material distribution fees can be charged. There is no corresponding standard for the quota of sea transportation costs in material distribution. Through theoretical analysis and on-site investigation, this study divides materials into two categories: construction materials and installation materials. The rate of material sea transportation fees is M, of which the rate of construction material sea transportation fees is Mb and the rate of installation material sea transportation fees is Mi.

[0028] Material sea transportation fee = M × (∑ fixed material fee + installation material fee)

[0029] Construction material sea transportation fee = Mc × (∑ fixed material fee + installation material fee)

[0030] Installation material sea transportation fee = Mi × (∑ fixed material fee + installation material fee)

[0031] A3. Adjustment of machinery costs:

[0032] Construction machinery usage fees refer to the machinery usage fees incurred during construction machinery operations, as well as the on-site installation and removal of machinery and off-site transportation costs. Including: depreciation, overhaul fees, maintenance fees, installation and removal fees, off-site transportation costs, operator labor costs, fuel and power costs, and other costs, etc.

[0033] The market unit price of island machinery = the fixed unit price + (maintenance fee × maintenance fee increase coefficient + labor cost × labor increase coefficient + fuel power fee, vehicle and vessel tax and transportation inspection fee × fuel power fee, vehicle and vessel tax and transportation inspection fee increase coefficient)

[0034] According to the statistics of multiple construction machinery on the island, the following types of machinery are used more frequently in island projects: electric engineering trucks, dump trucks with a capacity of 8t, truck cranes with a lifting capacity of 8t, light drilling rigs XJ-100, trucks with a capacity of 8t, electric air compressors with a displacement of 10m 3 / min, wheel loader bucket capacity 2m 3 This analysis and calculation uses the "Construction Machinery Unit Cost Quota for Power Construction Works (2018 Edition)" and the above-mentioned construction machinery unit cost base prices mainly used in distribution network projects for analysis.

[0035] The maintenance fee and fuel and power fee of the island project are increased by 10% compared with the land project. The labor cost is calculated according to the above adjustment coefficient. The depreciation fee, maintenance fee, installation and off-site transportation fee are the same as those of the land project. Finally, the following results are obtained after calculation:

[0036] Island engineering machinery fee = island engineering machinery fee adjustment coefficient Mm × ∑ fixed machinery fee. After calculation, the island engineering machinery fee adjustment coefficient Mm can be taken according to the following situations. Among them, the island classification can be comprehensively carried out according to the following standards:

[0037] Class I: Mm value is 1.3;

[0038] Class II: Mm value is 1.4;

[0039] Class III: Mm value is 1.5;

[0040] Category IV: The value of Mm is determined through consultation based on actual conditions.

[0041] A4. Equipment sea delivery fee:

[0042] Equipment distribution fee = equipment fee × equipment distribution fee rate. There is no standard for calculating sea transportation fee in the budget regulations. The fee standard refers to the "Regulations on the Preparation and Calculation of Power Grid Project Construction Budgets"

[0043] Equipment sea delivery fee = Equipment fee × Equipment sea delivery fee rate

[0044] The ocean delivery fee rate is 3.8% when the ocean transportation distance is within 100km. When the transportation distance exceeds 100km, the rate will increase by 0.08% for every additional 50km, and the part less than 50km will be calculated as 50km.

[0045] A5. Construction agency island dispatch fee:

[0046] The island dispatch fees of the construction organization refer to the sea transportation costs incurred in transporting construction tools, construction machinery, enterprise management office equipment, etc. to the construction site.

[0047] Construction organization island dispatch fee DQF = (labor cost + machinery cost) × dispatch fee rate D

[0048] The value of the dispatch fee rate D is as follows:

[0049] Category I: D value is 13% when the shipping distance is less than 50km, and increases by 5% for every additional 50km;

[0050] Category II: D value is 15% when the shipping distance is less than 50km, and increases by 5% for every additional 50km;

[0051] Category III: D value is 17% when the shipping distance is less than 50km, and increases by 5% for every additional 50km;

[0052] Category IV: The value of D is determined through consultation based on actual conditions.

[0053] Further,

[0054] B1. Adjusted labor cost RGF = 2 × labor cost;

[0055] B2. Material costs plus ocean freight:

[0056] Ocean freight for construction materials: JZHYF = 0.48 × material cost (without distinguishing between suppliers A and B);

[0057] Ocean freight for materials supplied by B for overhead line: JKYGHYF = 0.48 × material cost;

[0058] Ocean freight for materials supplied by Party A for overhead lines: JKJGHYF = 0.06 × material cost;

[0059] Ocean freight for installation projects other than overhead line projects: AZHYF = 0.06 × material cost.

[0060] B3. Adjusted machinery cost JXF = 1.3 × machinery cost.

[0061] B4. Increase the construction organization dispatch fee DXF = 13% (RGF + JXF).

[0062] B5. The rates of other measures fees, indirect costs, profits and taxes will not be adjusted. The fee base will be based on the adjusted labor and machinery costs (excluding taxes). The calculation of taxes is the same as the 2022 version of the budget regulations and will not be adjusted.

[0063] B6. Equipment freight and miscellaneous charges = original equipment price × ocean freight and miscellaneous charges rate 4.9%.

[0064] Furthermore, the island classification is specifically as follows:

[0065] Category I: It has docks for ships to berth; there are regular flights (ships) between the island and the mainland; the sailing time between the island and the mainland is less than 1 hour, and the island has a high degree of development.

[0066] Category II: It has docks for ships to berth; there are regular flights between the island and the mainland; the sailing time between the island and the mainland is more than 1 hour, and the island has a medium level of development.

[0067] Category III: Shipping costs are relatively high; there are only piers for small ships to berth; there are no regular flights (ships) to the mainland, the sailing time to the mainland is more than 1 hour, and the degree of island development is poor.

[0068] Category IV: No dock; no shipping routes to land.

[0069] Compared with the prior art, the present invention has the following beneficial effects: This standard adjusts the charging and pricing standards of medium and low voltage distribution network projects on islands by adjusting labor costs, material costs, machinery costs, equipment transportation fees, and increasing the island dispatch fees of construction organizations on the basis of the "20kV and below distribution network project construction budget preparation and calculation standards" (2021 version) and "20kV and below distribution network project budget quotas" (2021 version) promulgated by the National Energy Administration, and classifies them according to different islands. This billing method and system is based on the existing medium and low voltage distribution network project pricing system and the particularity of the island environment. By constructing a basic module and an adjustment module (including a coefficient adjustment module and a cost adjustment module), the cost of the medium and low voltage distribution network project on the island is comprehensively calculated. This method fully takes into account the natural conditions, geographical location, construction difficulty and other factors of the island, making the pricing results more scientific and reasonable. BRIEF DESCRIPTION OF THE DRAWINGS

[0070] Figure 1 The present invention discloses a method and system for charging and pricing on island medium and low voltage distribution network projects and an auxiliary wage adjustment coefficient P2 value table.

[0071] Figure 2 The present invention discloses a charging and pricing method and system for island medium and low voltage distribution network engineering, and a Mc and Mi index table.

[0072] Figure 3The present invention discloses an Mm index table of a fee pricing method and system based on an island medium and low voltage distribution network project.

[0073] Figure 4 The present invention discloses a method and system for charging and pricing a fee based on an island medium and low voltage distribution network project, and a composition table of measures fees before adjustment.

[0074] Figure 5 The present invention discloses a method and system for charging and pricing on island medium and low voltage distribution network projects and a composition table of the adjusted measures fee.

[0075] Figure 6 The present invention discloses a dispatch fee rate D index table for a fee pricing method and system based on an island medium and low voltage distribution network project. DETAILED DESCRIPTION

[0076] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0077] like Figure 1-6 As shown, it includes a basic module and an adjustment module. The basic module includes the total investment in the distribution network project and the construction and installation project fee. The adjustment module includes a coefficient adjustment module and a cost adjustment module.

[0078] Among them, the total investment of the distribution network project is composed of construction project costs, installation project costs, equipment purchase costs, other costs, basic reserve funds and dynamic costs; the construction and installation project costs are composed of labor costs, material costs, construction machinery usage fees, measures fees, indirect costs, profits, annual price differences and taxes.

[0079] Among them, the coefficient adjustment module adjusts the labor costs, material costs, construction machinery usage fees, and equipment purchase costs in the basic module in response to the unique natural environment of the island. By increasing the adjustment coefficient or adjusting the rate, it comprehensively considers the impact of the island environment on the investment in medium and low voltage distribution network projects. The cost adjustment module adjusts the measures costs in the basic module in response to the unique construction environment of the island, and increases the island dispatch fees for construction organizations.

[0080] in,

[0081] A1. Calculation and charging method of labor costs:

[0082] Labor costs refer to the various expenses incurred by production workers directly engaged in the construction of building installation projects, including basic wages, wage subsidies, auxiliary wages, employee welfare expenses, labor protection expenses for production personnel, etc.

[0083] This calculation and charging method adds the extra expenses of production workers due to the change of construction site from land to island on this basis. And by adding adjustment coefficients, the impact of these factors on the fixed labor cost is considered as a whole. It mainly includes the cost of production workers going on and off the island, subsidies during the period of going on and off the island, labor costs for island workers, island living subsidies, island accommodation costs, and at the same time considers the impact of the special environment of the island on the reduction of construction efficiency.

[0084] a1. Wage subsidy adjustment coefficient P1

[0085] Wage subsidies are defined as price subsidies, coal and gas subsidies, transportation subsidies, and mobile construction allowances issued in accordance with prescribed standards. Because island projects increase the cost of personnel going on and off the island, transportation subsidies should be increased accordingly. The frequency of mobile construction and island prices are also higher than those of land projects, so wage subsidies should be adjusted accordingly. The wage subsidy adjustment coefficient here can be calculated as follows:

[0086] P1=3.51×f×n×10∧(-4)

[0087] Among them: f--the average round-trip fare for the previous year

[0088] n--Number of workers going on and off the island each month

[0089] a2. Auxiliary salary adjustment coefficient P2

[0090] Auxiliary wages refer to the wages of production personnel for non-working days other than the effective construction days per year. They include wages during study and training, wages during job transfer, family visits, vacations, wages for work stoppages due to weather conditions, wages for sick leave within 6 months, and wages during marriage and funeral leave.

[0091] Due to the special geographical environment, island projects require additional wages for personnel during the transfer to the island, wages for work stoppages while waiting for materials and construction tools, wages for work stoppages due to government control and climate, and wages for returning to the mainland to visit relatives or take vacations. The above expenses are mainly related to the development level of the island, the sailing distance, and the island climate. After analysis, the auxiliary wage adjustment coefficient can be calculated according to the following four types of islands.

[0092] After calculation, the auxiliary wage adjustment coefficient P2 can be taken according to the following situations. Among them, the classification of islands can be carried out comprehensively according to the following standards:

[0093] Class I: P2 value is 1.8;

[0094] Class II: P2 value is 1.9;

[0095] Category III: P2 value is 2.0;

[0096] Category IV: The value of P2 is determined through consultation based on actual conditions.

[0097] A2. Adjustment of material costs:

[0098] Material costs refer to the main materials, auxiliary materials, components, semi-finished products, miscellaneous materials consumed during the construction process, as well as the costs of one-time consumable materials and amortized materials during the construction process. If the materials need to be transported from the centralized storage warehouse to the designated location of the construction site, material distribution fees can be charged. There is no corresponding standard for the quota of sea transportation costs in material distribution. Through theoretical analysis and on-site investigation, this study divides materials into two categories: construction materials and installation materials. The rate of material sea transportation fees is M, of which the rate of construction material sea transportation fees is Mb and the rate of installation material sea transportation fees is Mi.

[0099] Material sea transportation fee = M × (∑ fixed material fee + installation material fee)

[0100] Construction material sea transportation fee = Mc × (∑ fixed material fee + installation material fee)

[0101] Installation material sea transportation fee = Mi × (∑ fixed material fee + installation material fee)

[0102] A3. Adjustment of machinery costs:

[0103] Construction machinery usage fees refer to the machinery usage fees incurred during construction machinery operations, as well as the on-site installation and removal of machinery and off-site transportation costs. Including: depreciation, overhaul fees, maintenance fees, installation and removal fees, off-site transportation costs, operator labor costs, fuel and power costs, and other costs, etc.

[0104] The market unit price of island machinery = the fixed unit price + (maintenance fee × maintenance fee increase coefficient + labor cost × labor increase coefficient + fuel power fee, vehicle and vessel tax and transportation inspection fee × fuel power fee, vehicle and vessel tax and transportation inspection fee increase coefficient)

[0105] According to the statistics of multiple construction machinery on the island, the following types of machinery are used more frequently in island projects: electric engineering trucks, dump trucks with a capacity of 8t, truck cranes with a lifting capacity of 8t, light drilling rigs XJ-100, trucks with a capacity of 8t, electric air compressors with a displacement of 10m 3 / min, wheel loader bucket capacity 2m 3 This analysis and calculation uses the "Construction Machinery Unit Cost Quota for Power Construction Works (2018 Edition)" and the above-mentioned construction machinery unit cost base prices mainly used in distribution network projects for analysis.

[0106] The maintenance fee and fuel and power fee of the island project are increased by 10% compared with the land project. The labor cost is calculated according to the above adjustment coefficient. The depreciation fee, maintenance fee, installation and off-site transportation fee are the same as those of the land project. Finally, the following results are obtained after calculation:

[0107] Island engineering machinery fee = island engineering machinery fee adjustment coefficient Mm × ∑ fixed machinery fee. After calculation, the island engineering machinery fee adjustment coefficient Mm can be taken according to the following situations. Among them, the island classification can be comprehensively carried out according to the following standards:

[0108] Class I: Mm value is 1.3;

[0109] Class II: Mm value is 1.4;

[0110] Class III: Mm value is 1.5;

[0111] Category IV: The value of Mm is determined through consultation based on actual conditions.

[0112] A4. Equipment sea delivery fee:

[0113] Equipment distribution fee = equipment fee × equipment distribution fee rate. There is no standard for calculating sea transportation fee in the budget regulations. The fee standard refers to the "Regulations on the Preparation and Calculation of Power Grid Project Construction Budgets"

[0114] Equipment sea delivery fee = Equipment fee × Equipment sea delivery fee rate

[0115] The ocean delivery fee rate is 3.8% when the ocean transportation distance is within 100km. When the transportation distance exceeds 100km, the rate will increase by 0.08% for every additional 50km, and the part less than 50km will be calculated as 50km.

[0116] A5. Construction agency island dispatch fee:

[0117] The island dispatch fees of the construction organization refer to the sea transportation costs incurred in transporting construction tools, construction machinery, enterprise management office equipment, etc. to the construction site.

[0118] Construction organization island dispatch fee DQF = (labor cost + machinery cost) × dispatch fee rate D

[0119] The value of the dispatch fee rate D is as follows:

[0120] Category I: D value is 13% when the shipping distance is less than 50km, and increases by 5% for every additional 50km;

[0121] Category II: D value is 15% when the shipping distance is less than 50km, and increases by 5% for every additional 50km;

[0122] Category III: D value is 17% when the shipping distance is less than 50km, and increases by 5% for every additional 50km;

[0123] Category IV: The value of D is determined through consultation based on actual conditions.

[0124] in,

[0125] B1. Adjusted labor cost RGF = 2 × labor cost;

[0126] B2. Material costs plus ocean freight:

[0127] Ocean freight for construction materials: JZHYF = 0.48 × material cost (without distinguishing between suppliers A and B);

[0128] Ocean freight for materials supplied by B for overhead line: JKYGHYF = 0.48 × material cost;

[0129] Ocean freight for materials supplied by Party A for overhead lines: JKJGHYF = 0.06 × material cost;

[0130] Ocean freight for installation projects other than overhead line projects: AZHYF = 0.06 × material cost.

[0131] B3. Adjusted machinery cost JXF = 1.3 × machinery cost.

[0132] B4. Increase the construction organization dispatch fee DXF = 13% (RGF + JXF).

[0133] B5. The rates of other measures fees, indirect costs, profits and taxes will not be adjusted. The fee base will be based on the adjusted labor and machinery costs (excluding taxes). The calculation of taxes is the same as the 2022 version of the budget regulations and will not be adjusted.

[0134] B6. Equipment freight and miscellaneous charges = original equipment price × ocean freight and miscellaneous charges rate 4.9%.

[0135] The island classification is specifically as follows:

[0136] Category I: It has docks for ships to berth; there are regular flights (ships) between the island and the mainland; the sailing time between the island and the mainland is less than 1 hour, and the island has a high degree of development.

[0137] Category II: It has docks for ships to berth; there are regular flights between the island and the mainland; the sailing time between the island and the mainland is more than 1 hour, and the island has a medium level of development.

[0138] Category III: Shipping costs are relatively high; there are only piers for small ships to berth; there are no regular flights (ships) to the mainland, the sailing time to the mainland is more than 1 hour, and the degree of island development is poor.

[0139] Category IV: No dock; no shipping routes to land.

[0140] It should be noted that the present invention is a charging and pricing method and system based on medium and low voltage distribution network projects on islands. This standard is based on the "20kV and below distribution network project construction budget preparation and calculation standards" (2021 version) and "20kV and below distribution network project budget quotas" (2021 version) promulgated by the National Energy Administration. By adjusting labor costs, material costs, machinery costs, equipment transportation and miscellaneous fees, and increasing the island dispatch fees of construction organizations, the charging and pricing standards of medium and low voltage distribution network projects on islands are adjusted, and classified according to different islands. This billing method and system is based on the existing medium and low voltage distribution network project pricing system and the particularity of the island environment. By constructing a basic module and an adjustment module (including a coefficient adjustment module and a cost adjustment module), the cost of the medium and low voltage distribution network project on the island is comprehensively calculated. This method fully takes into account the natural conditions, geographical location, construction difficulty and other factors of the island, making the pricing results more scientific and reasonable.

[0141] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A charging and pricing method and system based on island medium and low voltage distribution network engineering, including a basic module, characterized in that: It also includes an adjustment module, the basic module includes the total investment in the distribution network project and the construction and installation project fees, and the adjustment module includes a coefficient adjustment module and a cost adjustment module.

2. A charging and pricing method and system based on island medium and low voltage distribution network engineering according to claim 1, characterized in that: The total investment in the distribution network project is composed of construction project costs, installation project costs, equipment purchase costs, other costs, basic reserve costs and dynamic costs. The construction and installation project costs are composed of labor costs, material costs, construction machinery usage fees, measures fees, indirect costs, profits, annual price differences and taxes.

3. A charging and pricing method and system based on island medium and low voltage distribution network engineering according to claim 2, characterized in that: The coefficient adjustment module adjusts the labor costs, material costs, construction machinery usage fees, and equipment purchase costs in the basic module in response to the unique natural environment of the island. It comprehensively considers the impact of the island environment on the investment in medium and low voltage distribution network projects by increasing the adjustment coefficient or adjusting the rate. The cost adjustment module adjusts the measures costs in the basic module in response to the unique construction environment of the island, and increases the island dispatch fees for construction organizations.

4. A charging and pricing method and system based on island medium and low voltage distribution network engineering according to claim 3, characterized in that: A1. Calculation and charging method of labor costs: Labor costs refer to the various expenses incurred by production workers directly engaged in the construction of building installation projects, including basic wages, wage subsidies, auxiliary wages, employee welfare expenses, labor protection expenses for production personnel, etc. This calculation and charging method adds the extra expenses of production workers due to the change of construction site from land to island on this basis. And by adding adjustment coefficients, the impact of these factors on the fixed labor cost is considered as a whole. It mainly includes the cost of production workers going on and off the island, subsidies during the period of going on and off the island, labor costs for island workers, island living subsidies, island accommodation costs, and at the same time considers the impact of the special environment of the island on the reduction of construction efficiency. a1. Wage subsidy adjustment coefficient P1 Wage subsidies are defined as price subsidies, coal and gas subsidies, transportation subsidies, and mobile construction allowances issued in accordance with prescribed standards. Because island projects increase the cost of personnel going on and off the island, transportation subsidies should be increased accordingly. The frequency of mobile construction and island prices are also higher than those of land projects, so wage subsidies should be adjusted accordingly. The wage subsidy adjustment coefficient here can be calculated as follows: P1=3.51×f×n×10∧(-4) Among them: f--the average round-trip fare for the previous year n--Number of workers going on and off the island each month a2. Auxiliary salary adjustment coefficient P2 Auxiliary wages refer to the wages of production personnel for non-working days other than the effective construction days per year. They include wages during study and training, wages during job transfer, family visits, vacations, wages for work stoppages due to weather conditions, wages for sick leave within 6 months, and wages during marriage and funeral leave. Due to the special geographical environment, island projects require additional wages for personnel during the transfer to the island, wages for work stoppages while waiting for materials and construction tools, wages for work stoppages due to government control and climate, and wages for returning to the mainland to visit relatives or take vacations. The above expenses are mainly related to the development level of the island, the sailing distance, and the island climate. After analysis, the auxiliary wage adjustment coefficient can be calculated according to the following four types of islands. After calculation, the auxiliary wage adjustment coefficient P2 can be taken according to the following situations. Among them, the classification of islands can be carried out comprehensively according to the following standards: Class I: P2 value is 1.8; Class II: P2 value is 1.9; Category III: P2 value is 2.0; Category IV: The value of P2 is determined through consultation based on actual conditions. A2. Adjustment of material costs: Material costs refer to the main materials, auxiliary materials, components, semi-finished products, miscellaneous materials consumed during the construction process, as well as the costs of one-time consumable materials and amortized materials during the construction process. If the materials need to be transported from the centralized storage warehouse to the designated location of the construction site, material distribution fees can be charged. There is no corresponding standard for the quota of sea transportation costs in material distribution. Through theoretical analysis and on-site investigation, this study divides materials into two categories: construction materials and installation materials. The rate of material sea transportation fees is M, of which the rate of construction material sea transportation fees is Mb and the rate of installation material sea transportation fees is Mi. Material sea transportation fee = M × (∑ fixed material fee + installation material fee) Construction material sea transportation fee = Mc × (∑ fixed material fee + installation material fee) Installation material sea transportation fee = Mi × (∑ fixed material fee + installation material fee) A3. Adjustment of machinery costs: Construction machinery usage fees refer to the machinery usage fees incurred during construction machinery operations, as well as the on-site installation and removal of machinery and off-site transportation costs. Including: depreciation, overhaul fees, maintenance fees, installation and removal fees, off-site transportation costs, operator labor costs, fuel and power costs, and other costs, etc. The market unit price of island machinery = the fixed unit price + (maintenance fee × maintenance fee increase coefficient + labor cost × labor increase coefficient + fuel power fee, vehicle and vessel tax and transportation inspection fee × fuel power fee, vehicle and vessel tax and transportation inspection fee increase coefficient) According to the statistics of multiple construction machinery on the island, the following types of machinery are used more frequently in island projects: electric engineering trucks, dump trucks with a capacity of 8t, truck cranes with a lifting capacity of 8t, light drilling rigs XJ-100, trucks with a capacity of 8t, electric air compressors with a displacement of 10m 3 / min, wheel loader bucket capacity 2m 3 This analysis and calculation uses the "Construction Machinery Unit Cost Quota for Power Construction Works (2018 Edition)" and the above-mentioned construction machinery unit cost base prices mainly used in distribution network projects for analysis. The maintenance fee and fuel and power fee of the island project are increased by 10% compared with the land project. The labor cost is calculated according to the above adjustment coefficient. The depreciation fee, maintenance fee, installation and off-site transportation fee are the same as those of the land project. Finally, the following results are obtained after calculation: Island engineering machinery fee = island engineering machinery fee adjustment coefficient Mm × ∑ fixed machinery fee. After calculation, the island engineering machinery fee adjustment coefficient Mm can be taken according to the following situations. Among them, the island classification can be comprehensively carried out according to the following standards: Class I: Mm value is 1.3; Class II: Mm value is 1.4; Class III: Mm value is 1.5; Category IV: The value of Mm is determined through consultation based on actual conditions. A4. Equipment sea delivery fee: Equipment distribution fee = equipment fee × equipment distribution fee rate. There is no standard for calculating sea transportation fee in the budget regulations. The fee standard refers to the "Regulations on the Preparation and Calculation of Power Grid Project Construction Budgets" Equipment sea delivery fee = Equipment fee × Equipment sea delivery fee rate The ocean delivery fee rate is 3.8% when the ocean transportation distance is within 100km. When the transportation distance exceeds 100km, the rate will increase by 0.08% for every additional 50km, and the part less than 50km will be calculated as 50km. A5. Construction agency island dispatch fee: The island dispatch fees of the construction organization refer to the sea transportation costs incurred in transporting construction tools, construction machinery, enterprise management office equipment, etc. to the construction site. Construction organization island dispatch fee DQF = (labor cost + machinery cost) × dispatch fee rate D The dispatch fee rate D is as follows: Category I: D value is 13% when the shipping distance is less than 50km, and increases by 5% for every additional 50km; Category II: D value is 15% when the shipping distance is less than 50km, and increases by 5% for every additional 50km; Category III: D value is 17% when the shipping distance is less than 50km, and increases by 5% for every additional 50km; Category IV: The value of D is determined through consultation based on actual conditions.

5. A charging and pricing method and system based on island medium and low voltage distribution network engineering according to claim 4, characterized in that: B1. Adjusted labor cost RGF = 2 × labor cost; B2. Material costs plus ocean freight: Ocean freight for construction materials: JZHYF = 0.48 × material cost (without distinguishing between suppliers A and B); Ocean freight for materials supplied by B for overhead line: JKYGHYF = 0.48 × material cost; Ocean freight for materials supplied by Party A for overhead lines: JKJGHYF = 0.06 × material cost; Ocean freight for installation projects other than overhead line projects: AZHYF = 0.06 × material cost. B3. Adjusted machinery cost JXF = 1.3 × machinery cost. B4. Increase the construction organization dispatch fee DXF = 13% (RGF + JXF). B5. The rates of other measures fees, indirect costs, profits and taxes will not be adjusted. The fee base will be based on the adjusted labor and machinery costs (excluding taxes). The calculation of taxes is the same as the 2022 version of the budget regulations and will not be adjusted. B6. Equipment freight and miscellaneous charges = original equipment price × ocean freight and miscellaneous charges rate 4.9%.

6. A charging and pricing method and system based on island medium and low voltage distribution network engineering according to claim 5, characterized in that: The island classification is specifically as follows: Category I: It has docks for ships to berth; there are regular flights (ships) between the island and the mainland; the sailing time between the island and the mainland is less than 1 hour, and the island has a high degree of development. Category II: It has docks for ships to berth; there are regular flights between the island and the mainland; the sailing time between the island and the mainland is more than 1 hour, and the island has a medium level of development. Category III: Shipping costs are relatively high; there are only piers for small ships to berth; there are no regular flights (ships) to the mainland, the sailing time to the mainland is more than 1 hour, and the degree of island development is poor. Category IV: No dock; There are no flights (ships) between the island and the mainland.

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