Regional power carbon dioxide emission factor calculation method and device

Abstract

The invention provides a regional power carbon dioxide emission factor calculation method and device, and the method comprises the steps: carrying out the grid division of a power supply region according to a topological structure of a power distribution network, and taking each obtained grid as a power supply subregion; taking the 500kV transformer substation in each power supply subarea as a convergent point, and extracting power production data, power consumption data and power interaction data; calculating an electric power carbon dioxide emission factor of the current rendezvous point according to the electric power production data, the power consumption data and the electric power interaction data; calculating an electric power carbon dioxide emission factor of the current power supply subarea according to the electric power carbon dioxide emission factor of the current convergent point; calculating the power carbon dioxide emission factor of the to-be-calculated area according to the power carbon dioxide emission factors of the related power supply subareas based on the topological relation between the to-be-calculated area and the power supply subareas; the method can improve the accuracy of regional power carbon dioxide emission factor calculation.

Description

Technical Field

[0001] The present invention relates to the technical field of carbon emission calculation, and particularly to a method and device for calculating the carbon dioxide emission factor of regional electricity. Background Art

[0002] The low-carbon transformation of the power industry is of top priority. As an important indicator for measuring the carbon emission intensity of power production, the carbon dioxide emission factor of electricity is of great significance for evaluating the application effect of low-carbon technologies and promoting the optimization of the regional energy structure. The research on the carbon dioxide emission factor of electricity contributes to the carbon emission accounting of the power industry itself.

[0003] By accurately calculating the carbon dioxide emission factor of electricity, targeted emission reduction measures can be formulated. For enterprises, the research on the carbon dioxide emission factor of electricity helps them manage their carbon footprint more precisely.

[0004] Against the background of increasingly strict global carbon emission policies, the research on the carbon dioxide emission factor of electricity refined to regions and time periods will provide an important scientific basis for meeting international market demands and promoting regional low-carbon transformation. At present, the power sources and characteristics of each sub-region are different, and there will be significant differences in the carbon dioxide emission factor of electricity. For more accurate carbon emission accounting of each sub-region and further study of the actual situation of the carbon dioxide emission factor of each region within a province, more refined research on the carbon dioxide emission factor of electricity for administrative regions is needed.

[0005] Patent text CN116882618A discloses a calculation method for carbon emissions of large urban power systems, including the following steps: Step 1: Divide the influencing factors affecting the carbon emissions of urban power systems into three categories: economy, environment, and technology, determine the mechanism of interaction and mutual influence among parameters in different fields, and quantify the impact of different influencing factors on the carbon emissions of urban power systems; Step 2: Use the analytic hierarchy process to construct an energy and power carbon emission index system to measure the carbon emission level of large urban power systems; Step 3: Construct a three-dimensional data representation method of time, space, and attributes for urban energy and power carbon emission data. Based on the production chain of electric power energy, obtain the measurement data of the carbon emission-related influencing factors mentioned in Step 1 from four aspects: production, transmission, distribution, and use of energy; Step 4: Construct a carbon emission model for the supply side of urban energy and power, a carbon emission model for the power transmission system, and a carbon emission model for the power consumption side, and calculate historical carbon emission data; Step 5: Perform data preprocessing on the relevant factor data obtained in Step 1; for some data that cannot be obtained or have insufficient information, such as economic data with missing monthly data, use the transfer learning method based on feature selection for supplementation; Step 6: Based on the data obtained in Steps 4 and 5, obtain time series features through the EMD empirical mode decomposition method, train the LSTM long short-term memory network using historical carbon emission data, and calculate the carbon emission data of power generation, power transmission, and power consumption enterprises. However, this method is relatively dependent on historical data, has a high modeling cost, and fails to consider regional differences, resulting in insufficient refinement. Summary of the Invention

[0006] The present invention provides a calculation method and device for regional power carbon dioxide emission factors, which can improve the accuracy of calculating regional power carbon dioxide emission factors.

[0007] A calculation method for regional power carbon dioxide emission factors includes: According to the distribution network topology structure, divide the power supply area into grids, and use each obtained grid as a power supply subarea; Use the 500 kV substations in each power supply subarea as convergence points, and extract power production data, power consumption data, and power quantity interaction data; According to the power production data, power consumption data, and power quantity interaction data, calculate the power carbon dioxide emission factor of the current convergence point; According to the power carbon dioxide emission factor of the current convergence point, calculate the power carbon dioxide emission factor of the current power supply subarea; Based on the topological relationship between the area to be calculated and the power supply subareas, calculate the power carbon dioxide emission factor of the area to be calculated according to the power carbon dioxide emission factors of the relevant power supply subareas.

[0008] Furthermore, the power supply areas do not cross each other, and each power supply area realizes independent power supply, with each power supply area supplying power to one or more areas.

[0009] Furthermore, the power generation data includes the power generation of grid-connected units of 500 kV and above and the power generation of grid-connected units of 220 kV and below. The power consumption data includes the power consumption of the power supply area. The power quantity interaction data includes the power quantity transferred into the convergence point through the UHV substation / converter station, the power quantity directly transferred into the convergence point from other areas, and the power quantity transferred from the convergence points of other power supply areas into the current convergence point.

[0010] Furthermore, according to the power generation data, power consumption data, and power quantity interaction data, calculating the power carbon dioxide emission factor of the current convergence point includes: Calculating the direct carbon emissions of grid-connected units of 500 kV and above in the current power supply area according to the power generation of grid-connected units of 500 kV and above in the current convergence point; Subtracting the power quantity transferred into the current convergence point through the UHV substation / converter station, the power quantity directly transferred into the current convergence point from other areas, and the power quantity transferred from the convergence points of other power supply areas into the current convergence point from the power consumption of the current power supply area to obtain the reverse power transmission quantity of grid-connected units of 220 kV and below in the current power supply area, and calculating the carbon emissions transferred into the current convergence point of grid-connected units of 220 kV and below in the current power supply area according to the reverse power transmission quantity; Calculating the average carbon dioxide emission factor of the UHV substation / converter station according to the power quantity transferred into the current convergence point through the UHV substation / converter station and its source, and calculating the carbon emissions transferred into the current convergence point through the UHV substation / converter station according to the average carbon dioxide emission factor of the UHV substation / converter station; Calculating the average carbon dioxide emission factor of the corresponding other area according to the power quantity directly transferred into the current convergence point from other areas and its source, and calculating the carbon emissions transferred into the current convergence point from other areas according to the average carbon dioxide emission factor of the corresponding other area; Calculating the carbon emissions transferred from the convergence points of other power supply areas into the current convergence point according to the power carbon dioxide emission factor of the convergence points of other power supply areas and the power quantity transferred into the current convergence point; Calculating and obtaining the power carbon dioxide emission factor of the current convergence point according to the power generation and direct carbon emissions of grid-connected units of 500 kV and above in the current convergence point, the reverse power transmission quantity and the carbon emissions transferred into the current convergence point of grid-connected units of 220 kV and below in the current power supply area, the carbon emissions and the transferred power quantity transferred into the current convergence point through the UHV substation / converter station, the carbon emissions and the transferred power quantity directly transferred into the current convergence point from other areas, and the carbon emissions and the transferred power quantity transferred from the convergence points of other power supply areas into the current convergence point.

[0011] Further, according to the electricity quantity transferred to the current convergence point via the UHV substation / converter station and its sources, calculate the average carbon dioxide emission factor of the UHV substation / converter station, including: Search for the carbon dioxide emission factors of the output areas of the electricity quantity transferred to the current convergence point via the UHV substation / converter station, multiply the carbon dioxide emission factor of each output area by the corresponding electricity quantity transferred to the current convergence point via the UHV substation / converter station respectively, and then sum them up to obtain the total carbon emissions transferred to the current convergence point via the UHV substation / converter station; Obtain the sum of all electricity quantities transferred to the current convergence point via the UHV substation / converter station; Take the ratio of the total carbon emissions transferred to the current convergence point via the UHV substation / converter station to the sum of all electricity quantities transferred to the current convergence point via the UHV substation / converter station as the average carbon dioxide emission factor of the UHV substation / converter station.

[0012] Further, according to the electricity quantity directly transferred to the current convergence point from other regions and its sources, calculate the average carbon dioxide emission factor of the corresponding other regions, including: Search for the carbon dioxide emission factors of the other regions corresponding to the electricity quantity directly transferred to the current convergence point, multiply the carbon dioxide emission factor corresponding to each other region by the corresponding electricity quantity directly transferred to the current convergence point respectively, and then sum them up to obtain the total carbon emissions directly transferred to the current convergence point from other regions; Obtain the sum of all electricity quantities directly transferred to the current convergence point from other regions; Take the ratio of the total carbon emissions directly transferred to the current convergence point from other regions to the sum of all electricity quantities directly transferred to the current convergence point from other regions as the average carbon dioxide emission factor of the other regions.

[0013] Further, calculate the electricity carbon dioxide emission factor of the current convergence point, including: Add up the direct carbon emissions of the grid-connected units of 500 kV and above in the current power supply area, the carbon emissions transferred to the current convergence point by the grid-connected units of 220 kV and below in the current power supply area, the total sum of the carbon emissions transferred to the current convergence point by all UHV substations / converter stations, the total sum of the carbon emissions directly transferred to the current convergence point by all other regions, and the total sum of the carbon emissions transferred to the current convergence point by the convergence points of all other power supply areas to obtain the total carbon emissions of the current convergence point; Add up the power generation of the 500 kV grid-connected units in the current power supply area, the reverse power transmission of the grid-connected units of 220 kV and below in the current power supply area, the sum of the electricity quantities transferred to the current convergence point by all UHV substations / converter stations, the sum of the electricity quantities directly transferred to the current convergence point by all other regions, and the sum of the electricity quantities transferred to the current convergence point by the convergence points of all other power supply areas to obtain the total electricity quantity of the current convergence point; Take the ratio of the total carbon emissions of the current convergence point to the total electricity consumption of the current convergence point as the power carbon dioxide emission factor of the current convergence point.

[0014] Further, calculate the power carbon dioxide emission factor of the current power supply area according to the power carbon dioxide emission factor of the current convergence point, including: Add the sum of the electricity transferred into the current convergence point by all UHV substations / converter stations, the sum of the electricity directly transferred into the current convergence point by all other regions, and the sum of the electricity transferred into the current convergence point by the convergence points of all other power supply areas to obtain the net transferred-in electricity sum of the current convergence point; Multiply the net transferred-in electricity sum of the current convergence point by the power carbon dioxide emission factor of the current convergence point to obtain the net transferred-in carbon emissions of the current convergence point; Calculate the direct carbon emissions of the grid-connected units below 220 kV in the current power supply area according to the power generation of the grid-connected units below 220 kV in the current power supply area; Add the net transferred-in carbon emissions of the current convergence point to the direct carbon emissions of the grid-connected units below 220 kV in the current power supply area to obtain the total carbon emissions of the current power supply area; Add the net transferred-in electricity of the current convergence point to the power generation of the grid-connected units below 220 kV in the current power supply area to obtain the total electricity of the current power supply area; Take the ratio of the total carbon emissions of the current power supply area to the total electricity of the current power supply area as the power carbon dioxide emission factor of the current power supply area.

[0015] Further, based on the topological relationship between the area to be calculated and the power supply area, calculate the power carbon dioxide emission factor of the area to be calculated according to the power carbon dioxide emission factors of the relevant power supply areas, including: Determine the first power supply area that completely supplies power to the area to be calculated and the second power supply area that supplies power to the area to be calculated and other areas within the area to be calculated; Multiply the electricity consumption of each of the first power supply areas by the corresponding power carbon dioxide emission factor of the first power supply area and then sum them up to obtain the carbon emissions of all the first power supply areas; Add the electricity consumption of the second power supply area within the area to be calculated to the power generation of its grid-connected units below 220 kV, and then multiply the result by the corresponding power carbon dioxide emission factor of the second power supply area to obtain the carbon emissions of each second power supply area. Sum up the carbon emissions of all the second power supply areas to obtain the carbon emissions of all the second power supply areas; Add the carbon emissions of all the first power supply areas to the carbon emissions of all the second power supply areas to obtain the total carbon emissions of the area to be calculated; Add up the power consumption of all the first power supply zones within the area to be calculated to obtain the total power consumption of all the first power supply zones; Add up the power consumption of each second power supply zone within the area to be calculated and the power generation of its grid-connected units at 220 kV and below to obtain the power consumption of each second power supply zone. Then add up the power consumption of all the second power supply zones to obtain the total power consumption of all the second power supply zones; Add up the total power consumption of all the first power supply zones and the total power consumption of all the second power supply zones to obtain the total power consumption of the area to be calculated; Take the ratio of the total carbon emissions of the area to be calculated and the total power consumption of the area to be calculated as the power carbon dioxide emission factor of the area to be calculated.

[0016] A device for calculating the power carbon dioxide emission factor of a region, comprising: A division module, configured to divide the power supply area into grids according to the distribution network topology structure, and use each obtained grid as a power supply zone; A data extraction module, configured to use the 500 kV substations in each power supply zone as aggregation points to extract power production data, power consumption data, and power interaction data; An aggregation point calculation module, configured to calculate the power carbon dioxide emission factor of the current aggregation point according to the power production data, power consumption data, and power interaction data; A first calculation module, configured to calculate the power carbon dioxide emission factor of the current power supply zone according to the power carbon dioxide emission factor of the current aggregation point; A second calculation module, configured to calculate the power carbon dioxide emission factor of the area to be calculated according to the power carbon dioxide emission factors of the relevant power supply zones based on the topological relationship between the area to be calculated and the power supply zones.

[0017] Further, the power supply zones do not cross each other, and each power supply zone realizes independent power supply, and each power supply zone supplies power to one or more regions.

[0018] Further, the power production data includes the power generation of grid-connected units at 500 kV and above and the power generation of grid-connected units at 220 kV and below, the power consumption data includes the power consumption of the power supply zone, and the power interaction data includes the power transferred into the aggregation point via the UHV substation / converter station, the power directly transferred into the aggregation point from other regions, and the power transferred from the aggregation points of other power supply zones into the current aggregation point.

[0019] Further, the aggregation point calculation module calculates the power carbon dioxide emission factor of the current aggregation point according to the power production data, power consumption data, and power interaction data, including: Calculate the direct carbon emissions of grid-connected units at 500 kV and above in the current convergence point based on the power generation of grid-connected units at 500 kV and above in the current power supply area; Subtract the power transferred into the current convergence point through the UHV substation / converter station, the power directly transferred into the current convergence point from other regions, and the power transferred into the current convergence point from the convergence points of other power supply areas from the power consumption of the current power supply area to obtain the reverse power transmission of grid-connected units at 220 kV and below in the current power supply area, and calculate the carbon emissions transferred into the current convergence point by grid-connected units at 220 kV and below in the current power supply area according to the reverse power transmission; Calculate the average carbon dioxide emission factor of the UHV substation / converter station based on the power transferred into the current convergence point through the UHV substation / converter station and its source, and calculate the carbon emissions transferred into the current convergence point through the UHV substation / converter station according to the average carbon dioxide emission factor of the UHV substation / converter station; Calculate the average carbon dioxide emission factor of the corresponding other region based on the power directly transferred into the current convergence point from other regions and its source, and calculate the carbon emissions transferred into the current convergence point from other regions according to the average carbon dioxide emission factor of the corresponding other region; Calculate the carbon emissions transferred into the current convergence point from the convergence points of other power supply areas according to the power carbon dioxide emission factor of the convergence points of other power supply areas and the power transferred into the current convergence point; Calculate the power carbon dioxide emission factor of the current convergence point based on the power generation and direct carbon emissions of grid-connected units at 500 kV and above in the current convergence point, the reverse power transmission of grid-connected units at 220 kV and below in the current power supply area and the carbon emissions transferred into the current convergence point, the carbon emissions and the transferred power into the current convergence point through the UHV substation / converter station, the carbon emissions and the transferred power directly transferred into the current convergence point from other regions, and the carbon emissions and the transferred power transferred into the current convergence point from the convergence points of other power supply areas.

[0020] Further, the convergence point calculation module calculates the average carbon dioxide emission factor of the UHV substation / converter station based on the power transferred into the current convergence point through the UHV substation / converter station and its source, including: Search for the carbon dioxide emission factor of the output area of the power transferred into the current convergence point through the UHV substation / converter station, multiply the carbon dioxide emission factor of each output area by the corresponding power transferred into the current convergence point through the UHV substation / converter station respectively and then sum them up to obtain the total carbon emissions transferred into the current convergence point through the UHV substation / converter station; Obtain the sum of all the powers transferred into the current convergence point through the UHV substation / converter station; The ratio of the total carbon emissions transferred to the current convergence point through the UHV substation / converter station to the sum of all the electricity transferred to the current convergence point through the UHV substation / converter station is taken as the average carbon dioxide emission factor of the UHV substation / converter station.

[0021] Further, the convergence point calculation module calculates the average carbon dioxide emission factor of the corresponding other regions according to the electricity transferred directly to the current convergence point from other regions and its sources, including: Search for the carbon dioxide emission factors of other regions corresponding to the electricity transferred directly to the current convergence point, multiply the carbon dioxide emission factor corresponding to each other region by the corresponding electricity transferred directly to the current convergence point respectively and then sum them up to obtain the total carbon emissions transferred directly to the current convergence point from other regions; Obtain the sum of all the electricity transferred directly to the current convergence point from other regions; The ratio of the total carbon emissions transferred directly to the current convergence point from other regions to the sum of all the electricity transferred directly to the current convergence point from other regions is taken as the average carbon dioxide emission factor of other regions.

[0022] Further, the convergence point calculation module calculates the power carbon dioxide emission factor of the current convergence point, including: Add up the direct carbon emissions of the grid-connected units of 500 kV and above in the current power supply area, the carbon emissions transferred from the grid-connected units of 220 kV and below in the current power supply area to the current convergence point, the total carbon emissions transferred from all UHV substations / converter stations to the current convergence point, the total carbon emissions transferred directly to the current convergence point from all other regions, and the total carbon emissions transferred from the convergence points of all other power supply areas to the current convergence point to obtain the total carbon emissions of the current convergence point; Add up the power generation of the 500 kV grid-connected units in the current power supply area, the reverse power transmission of the grid-connected units of 220 kV and below in the current power supply area, the sum of the electricity transferred from all UHV substations / converter stations to the current convergence point, the sum of the electricity transferred directly to the current convergence point from all other regions, and the sum of the electricity transferred from the convergence points of all other power supply areas to the current convergence point to obtain the total electricity of the current convergence point; The ratio of the total carbon emissions of the current convergence point to the total electricity of the current convergence point is taken as the power carbon dioxide emission factor of the current convergence point.

[0023] Further, the first calculation module calculates the power carbon dioxide emission factor of the current power supply area according to the power carbon dioxide emission factor of the current convergence point, including: Add up the sum of the electricity transferred from all UHV substations / converter stations to the current convergence point, the sum of the electricity transferred directly to the current convergence point from all other regions, and the sum of the electricity transferred from the convergence points of all other power supply areas to the current convergence point to obtain the net transferred electricity sum of the current convergence point; Multiply the net transferred electricity of the current convergence point by the power carbon dioxide emission factor of the current convergence point to obtain the net transferred carbon emissions of the current convergence point; Calculate the direct carbon emissions of grid-connected units below 220 kV in the current power supply area according to the power generation of grid-connected units below 220 kV in the current power supply area; Add the net transferred carbon emissions of the current convergence point to the direct carbon emissions of grid-connected units below 220 kV in the current power supply area to obtain the total carbon emissions of the current power supply area; Add the net transferred electricity of the current convergence point to the power generation of grid-connected units below 220 kV in the current power supply area to obtain the total electricity of the current power supply area; Take the ratio of the total carbon emissions of the current power supply area to the total electricity of the current power supply area as the power carbon dioxide emission factor of the current power supply area.

[0024] Further, based on the topological relationship between the area to be calculated and the power supply area, the second calculation module calculates the power carbon dioxide emission factor of the area to be calculated according to the power carbon dioxide emission factor of the relevant power supply area, including: Determine the first power supply area that completely supplies power to the area to be calculated and the second power supply area that supplies power to the area to be calculated and other areas within the area to be calculated; Multiply the electricity consumption of each of the first power supply areas by the corresponding power carbon dioxide emission factor of the first power supply area and then sum them to obtain the carbon emissions of all the first power supply areas; Add the absorbed electricity of the second power supply area within the area to be calculated to its power generation of grid-connected units below 220 kV and then multiply by the corresponding power carbon dioxide emission factor of the second power supply area to obtain the carbon emissions of each second power supply area, and sum the carbon emissions of all the second power supply areas to obtain the carbon emissions of all the second power supply areas; Add the carbon emissions of all the first power supply areas to the carbon emissions of all the second power supply areas to obtain the total carbon emissions of the area to be calculated; Add the electricity consumption of all the first power supply areas within the area to be calculated to obtain the total electricity consumption of all the first power supply areas; Add the absorbed electricity of each second power supply area within the area to be calculated to its power generation of grid-connected units below 220 kV to obtain the electricity consumption of each second power supply area, and sum the electricity consumption of all the second power supply areas to obtain the total electricity consumption of all the second power supply areas; Add the total electricity consumption of all the first power supply areas to the total electricity consumption of all the second power supply areas to obtain the total electricity consumption of the area to be calculated; Use the ratio of the total carbon emissions of the area to be calculated to the total electricity consumption of the area to be calculated as the electricity carbon dioxide emission factor of the area to be calculated.

[0025] The method and device for calculating the regional electricity carbon dioxide emission factor provided by the present invention have at least the following beneficial effects: (1) For the large differences in the power source structures of different power supply areas, different types of power sources are connected to different voltage levels and have different power generation amounts. According to the differences in the electricity nature of the electricity in the 500 kV power grid and the power grids in the areas below 220 kV, calculate the carbon emissions and electricity carbon dioxide emission factors based on the electricity nature and weight ratio, which can fully reflect the power source structure and electricity consumption characteristics and effectively improve the accuracy of calculating the electricity carbon dioxide factor.

[0026] (2) Regard the substations at 500 kV in the power supply area as convergence points. Taking the convergence points of the power supply area as the center, calculate the converged electricity and electricity carbon factors at the convergence points, and then calculate the electricity carbon factors in the 220 kV sub-areas based on the electricity sent down from the 500 kV convergence points and the power generation amounts below 220 kV, which can more scientifically reflect the actual operating characteristics of the power system; (3) For the electricity transferred from other areas to the current area to be calculated, generally through three methods: converter stations, UHV channels, and direct transfer. Considering the nature of the external electricity serving the entire area, when calculating the electricity transferred from other areas, the electricity carbon dioxide emission factor is uniformly taken as the weighted average of its electricity carbon dioxide emission factors, which can better reflect the fairness of electricity consumption; (4) Based on the power supply area, carry out research and calculation on the regional electricity carbon dioxide emission factor, which will greatly simplify the relevant work content and steps and can more truly reflect the electricity interaction topological relationship. Description of the Drawings

[0027] Figure 1 It is a flowchart of an embodiment of the method for calculating the regional electricity carbon dioxide emission factor provided by the present invention.

[0028] Figure 2 It is a flowchart of an embodiment of calculating the electricity carbon dioxide emission factor at the convergence point in the method for calculating the regional electricity carbon dioxide emission factor provided by the present invention.

[0029] Figure 3 It is a flowchart of an embodiment of calculating the electricity carbon dioxide emission factor in the power supply area in the method for calculating the regional electricity carbon dioxide emission factor provided by the present invention.

[0030] Figure 4 It is a flowchart of an embodiment of calculating the electricity carbon dioxide emission factor in the area to be calculated in the method for calculating the regional electricity carbon dioxide emission factor provided by the present invention.

[0031] Figure 5Schematic structural diagram of an embodiment of the regional power carbon dioxide emission factor calculation device provided by the present invention. Detailed implementation manners

[0032] To better understand the above technical solutions, the following will explain the above technical solutions in detail in conjunction with the accompanying drawings of the specification and specific implementation manners.

[0033] Referring to Figure 1 , in some embodiments, a method for calculating the regional power carbon dioxide emission factor is provided, including: S1. According to the distribution network topology structure, divide the power supply area into grids, and use each obtained grid as a power supply sub-area; S2. Use the 500 kV substations in each power supply sub-area as convergence points, and extract power production data, power consumption data, and power interaction data; S3. According to the power production data, power consumption data, and power interaction data, calculate the power carbon dioxide emission factor of the current convergence point; S4. According to the power carbon dioxide emission factor of the current convergence point, calculate the power carbon dioxide emission factor of the current power supply sub-area; S5. Based on the topological relationship between the area to be calculated and the power supply sub-areas, calculate the power carbon dioxide emission factor of the area to be calculated according to the power carbon dioxide emission factors of the relevant power supply sub-areas.

[0034] Further, in step S1, the power supply sub-areas do not cross each other, and each power supply sub-area realizes independent power supply. Each power supply sub-area supplies power to one or more areas, and each power supply sub-area includes a 500 kV substation.

[0035] The "area" mentioned in this embodiment may be an administrative area.

[0036] Specifically, the power supply sub-areas are divided into non-crossing grids on the basis of the grid planning of the distribution network, fully considering factors such as the grid structure of each power supply unit, load demand, municipal planning, and plot nature, and each unit can realize an independent power supply sub-area mode. Each power supply sub-area generally supplies power to one or more areas (administrative sub-areas). Among them, some power supply sub-areas cross the boundaries of different areas (administrative sub-areas). Therefore, there may be power interaction relationships of voltage levels of 500 kV, 220 kV and below between different areas (administrative sub-areas).

[0037] Further, in step S2, the power generation data includes the power generation of grid-connected units of 500 kV and above and the power generation of grid-connected units of 220 kV and below. The power consumption data includes the power consumption of the power supply area. The power interaction data includes the power transferred to the convergence point through the UHV substation / converter station, the power directly transferred to the convergence point from other areas, and the power transferred from the convergence point of other power supply areas to the current convergence point.

[0038] Specifically, the power generation data is obtained from the power generation detailed report, the power consumption data is obtained according to the power consumption detailed report, and the power interaction data can be obtained through the 500 kV busbar checkpoint. In addition, the power output area corresponding to the power output substation, the power receiving substation, and the power receiving area corresponding to the power receiving substation within the power supply area can also be obtained through the 500 kV busbar checkpoint, and the mutual power supply within the same power supply area is excluded, that is, the interaction power when the power output area and the power receiving area are the same.

[0039] Further, referring to Figure 2 , in step S3, according to the power generation data, the power consumption data, and the power interaction data, calculate the power carbon dioxide emission factor of the current convergence point, including: S31. Calculate the direct carbon emissions of grid-connected units of 500 kV and above in the current power supply area according to the power generation of grid-connected units of 500 kV and above at the current convergence point; S32. Subtract the power transferred to the current convergence point through the UHV substation / converter station, the power directly transferred to the current convergence point from other areas, and the power transferred from the convergence point of other power supply areas to the current convergence point from the power consumption of the current power supply area to obtain the reverse power transmission of grid-connected units of 220 kV and below in the current power supply area, and calculate the carbon emissions transferred from grid-connected units of 220 kV and below in the current power supply area to the current convergence point according to the reverse power transmission; S33. Calculate the average carbon dioxide emission factor of the UHV substation / converter station according to the power transferred to the current convergence point through the UHV substation / converter station and its source, and calculate the carbon emissions transferred to the current convergence point through the UHV substation / converter station according to the average carbon dioxide emission factor of the UHV substation / converter station; S34. Calculate the average carbon dioxide emission factor of the corresponding other area according to the power directly transferred to the current convergence point from other areas and its source, and calculate the carbon emissions transferred from the corresponding other area to the current convergence point according to the average carbon dioxide emission factor of the corresponding other area; S35. Calculate the carbon emissions transferred from the convergence point of other power supply areas to the current convergence point according to the power carbon dioxide emission factor of the convergence point of other power supply areas and the power transferred to the current convergence point; S36. Calculate the power carbon dioxide emission factor of the current convergence point based on the power generation and direct carbon emissions of grid-connected units at 500 kV and above in the current convergence point, the reverse power transmission of grid-connected units at 220 kV and below in the current power supply area, the carbon emissions transferred into the current convergence point, the carbon emissions and the transferred power into the current convergence point from the UHV substation / converter station, the carbon emissions and the transferred power directly transferred into the current convergence point from other regions, and the carbon emissions and the transferred power into the current convergence point from the convergence points of other power supply areas.

[0040] Specifically, in step S31, according to the energy type of the grid-connected units at 500 kV and above in the current convergence point, determine the carbon emission factor of its fuel. The data source is official statistics. Multiply the power generation of the grid-connected units at 500 kV and above in the current convergence point by the carbon emission factor of the corresponding fuel to obtain the direct carbon emissions Em of the grid-connected units at 500 kV and above in the current power supply area. 500,k 。

[0041] Furthermore, in step S32, for the calculated reverse power transmission, according to the energy type of the grid-connected units at 220 kV and below in the current power supply area, determine the carbon emission factor of its fuel. Multiply the reverse power transmission by the carbon emission factor of the corresponding fuel to obtain the carbon emissions Em transferred into the current convergence point by the grid-connected units at 220 kV and below in the current power supply area. 220,kh 。

[0042] Furthermore, in step S33, the power transferred into the current convergence point through the UHV substation / converter station, that is, the power indirectly transferred into the current convergence point from other regions (which can be other administrative regions). According to the power transferred into the current convergence point through the UHV substation / converter station and its source, calculate the average carbon dioxide emission factor of the UHV substation / converter station, including: S331. Search for the carbon dioxide emission factor of the output area of the power transferred into the current convergence point through the UHV substation / converter station. Multiply the carbon dioxide emission factor of each output area by the corresponding power transferred into the current convergence point through the UHV substation / converter station and then sum to obtain the total carbon emissions transferred into the current convergence point through the UHV substation / converter station. S332. Calculate the sum of all the power transferred into the current convergence point through the UHV substation / converter station. S333. Take the ratio of the total carbon emissions transferred into the current convergence point through the UHV substation / converter station to the sum of all the power transferred into the current convergence point through the UHV substation / converter station as the average carbon dioxide emission factor of the UHV substation / converter station.

[0043] Specifically, assume that the carbon dioxide emission factor of the output area q of the power transferred into the current convergence point through the UHV substation / converter station is EF. q(This data can be obtained through the official of the output area), and the electricity quantity transferred into the current convergence point through the UHV substation / converter station is E imp,qh,kh , then the total carbon emissions transferred into the current convergence point through the UHV substation / converter station are , and the sum of all electricity quantities transferred into the current convergence point through the UHV substation / converter station is , then the average carbon dioxide emission factor EF qh of the UHV substation / converter station is (1) Among them, EF qh is the average carbon dioxide emission factor of the UHV substation / converter station, EF q is the carbon dioxide emission factor of the output area of the electricity quantity transferred into the current convergence point through the UHV substation / converter station, and E imp,qh,kh is the electricity quantity transferred into the current convergence point through the UHV substation / converter station.

[0044] Furthermore, in step S33, after obtaining the average carbon dioxide emission factor EF qh of the UHV substation / converter station, multiply it by the electricity quantity E imp,qh,kh transferred into the current convergence point through each UHV substation / converter station q and sum them up to obtain the total carbon emissions sum transferred into the current convergence point through all UHV substations / converter stations.

[0045] Furthermore, in step S34, according to the electricity quantity directly transferred into the current convergence point from other regions and its sources, calculate the average carbon dioxide emission factor of the corresponding other regions, including: S341. Search for the carbon dioxide emission factors of other regions corresponding to the electricity quantity directly transferred into the current convergence point, multiply the carbon dioxide emission factor corresponding to each other region by the corresponding electricity quantity directly transferred into the current convergence point and sum them up to obtain the total carbon emissions directly transferred into the current convergence point from other regions; S342. Obtain the sum of all electricity quantities directly transferred into the current convergence point from other regions; S343. Take the ratio of the total carbon emissions directly transferred into the current convergence point from other regions to the sum of all electricity quantities directly transferred into the current convergence point from other regions as the average carbon dioxide emission factor of other regions.

[0046] Specifically, assume that the carbon dioxide emission factor of other region n corresponding to the electricity quantity directly transferred into the current convergence point is EF n (This data can be obtained through the official of the corresponding formed region), and the electricity quantity directly transferred into the current convergence point from the corresponding other region is E imp,n,kh , then the total carbon emissions sum , the sum of the electricity transferred directly from all other regions to the current convergence point is , then the average carbon dioxide factor EF of other regions avg is: (2) where EF avg is the average carbon dioxide factor of other regions, EF n is the carbon dioxide emission factor of other region n, and E imp,n,kh is the electricity transferred from other regions to the current convergence point.

[0047] Furthermore, in step S34, after obtaining the average carbon dioxide emission factor EF avg of other regions, multiply it by the electricity E imp,n,kh transferred from each other region to the current convergence point and sum them up to obtain the total carbon emissions from all other regions transferred to the current convergence point .

[0048] Furthermore, in step S35, the calculation method of the power carbon dioxide emission factor of the convergence point of other power supply sub - regions is as in step S3 of this embodiment. The power carbon dioxide emission factor of the convergence point of other power supply sub - regions is EF ih , and the electricity transferred from the convergence point of other power supply sub - regions to the current convergence point is The total carbon emissions from the convergence points of all other power supply sub - regions transferred to the said convergence point is .

[0049] Furthermore, in step S36, calculating the power carbon dioxide emission factor of the current convergence point includes: S361. Sum up the direct carbon emissions Em 500,k of the grid - connected units of 500 kV and above in the current power supply sub - region, the carbon emissions Em 220,kh transferred from the grid - connected units of 220 kV and below in the current power supply sub - region to the current convergence point, the total carbon emissions transferred from all UHV substations / converter stations to the current convergence point, the total carbon emissions transferred directly from all other regions to the current convergence point, and the total carbon emissions transferred from the convergence points of all other power supply sub - regions to the current convergence point to obtain the total carbon emissions of the current convergence point; S362. Sum up the power generation E 500,k of the 500 kV grid - connected units in the current power supply sub - region, the reverse power transmission E 220,kh of the grid - connected units of 220 kV and below in the current power supply sub - region, the sum of the electricity transferred from all UHV substations / converter stations to the current convergence point, and the sum of the electricity , the sum of the electricity transferred from the convergence points of all other power supply areas to the current convergence point are added together to obtain the total electricity amount of the current convergence point; S363. Take the ratio of the total carbon emissions of the current convergence point to the total electricity amount of the current convergence point as the electricity carbon dioxide emission factor of the current convergence point. The specific calculation formula is as follows: ; (3) where, EF kh represents the electricity carbon dioxide emission factor of the current convergence point, E5 00,k represents the power generation of the 500KV grid-connected units in the current power supply area, E 220,kh represents the reverse power transmission amount of the grid-connected units below 220kV in the current power supply area, E imp,qh,kh represents the electricity amount transferred into the current convergence point through the UHV substation / converter station, q represents the number of UHV substations / converter stations, EF qh is the average carbon dioxide emission factor of the UHV substation / converter station, E imp,n,kh represents the electricity amount directly transferred from other areas into the current convergence point, n represents the number of other areas, EF avg is the average carbon dioxide emission factor of other areas, EF ih is the electricity carbon dioxide emission factor of the convergence points in other power supply areas, represents the electricity amount transferred from the convergence points in other power supply areas to the current convergence point, i represents the number of convergence points in other power supply areas.

[0050] Furthermore, referring to Figure 3 , in step S4, according to the electricity carbon dioxide emission factor of the current convergence point, calculating the electricity carbon dioxide emission factor of the current power supply area includes: S41. Add the sum of the electricity amounts transferred into the current convergence point through all UHV substations / converter stations, the sum of the electricity amounts directly transferred from all other areas into the current convergence point, and the sum of the electricity amounts transferred from the convergence points in all other power supply areas to the current convergence point to obtain the total net transferred electricity amount of the current convergence point; S42. Multiply the total net transferred electricity amount of the current convergence point by the electricity carbon dioxide emission factor of the current convergence point to obtain the total net transferred carbon emissions of the current convergence point; S43. Calculate the direct carbon emissions of the grid-connected units below 220kV in the current power supply area according to the power generation of the grid-connected units below 220kV in the current power supply area; S44. Add the total net transferred carbon emissions of the current convergence point to the direct carbon emissions of the grid-connected units below 220kV in the current power supply area to obtain the total carbon emissions of the current power supply area; S45. Add the net imported power of the current convergence point to the power generation of grid-connected units at and below 220 kV in the current power supply area to obtain the total power of the current power supply area; S46. Take the ratio of the total carbon emissions of the current power supply area to the total power of the current power supply area as the power carbon dioxide emission factor of the current power supply area.

[0051] Specifically, in step S41, the sum of the power imported into the current convergence point from all UHV substations / converter stations , the sum of the power directly imported into the current convergence point from all other regions , and the sum of the power imported into the current convergence point from the convergence points of all other power supply areas are added together to obtain the net imported power sum E of the current convergence point imp,kh .

[0052] Furthermore, in step S42, multiply the net imported power E of the current convergence point imp,kh by the power carbon dioxide emission factor EF of the current convergence point kh to obtain the net imported carbon emissions of the current convergence point.

[0053] Furthermore, in step S43, based on the power generation E of grid-connected units at and below 220 kV in the current power supply area 220,k , calculate the direct carbon emissions Em of grid-connected units at and below 220 kV in the current power supply area 220,k , specifically obtained by calculating according to the carbon emission factor corresponding to the fuel type of grid-connected units at and below 220 kV and the power generation.

[0054] Furthermore, in step S44, add the net imported carbon emissions EF of the current convergence point kh *E imp,kh to the direct carbon emissions Em of grid-connected units at and below 220 kV in the current power supply area 220,k to obtain the total carbon emissions of the current power supply area.

[0055] Furthermore, in step S45, add the net imported power sum E of the current convergence point imp,kh to the power generation E of grid-connected units at and below 220 kV in the current power supply area 220,k to obtain the total power of the current power supply area.

[0056] Furthermore, in step S46, the power carbon dioxide emission factor of the current power supply area is calculated according to the following formula: ; (4) where EF k represents the power carbon dioxide emission factor of the current power supply area k, and E imp,kh Represents the sum of the net transferred-in electricity quantities at the current convergence point, EF kh Represents the power carbon dioxide emission factor of the convergence points within the power supply area, E 220,k Represents the power generation of grid-connected units at 220 kV and below within the power supply area, Em 220,k Represents the direct carbon emissions of grid-connected units at 220 kV and below within the current power supply area k.

[0057] Furthermore, referring to Figure 4 , in step S5, based on the topological relationship between the area to be calculated and the power supply area, calculate the power carbon dioxide emission factor of the area to be calculated according to the power carbon dioxide emission factors of the relevant power supply areas, including: S51. Determine the first power supply area that supplies power solely to the area to be calculated and the second power supply area that supplies power to the area to be calculated and other areas within the area to be calculated; S52. Multiply the electricity consumption Ea of each of the first power supply areas by the corresponding power carbon dioxide emission factor EF of the first power supply area k,a and then sum them up to obtain the carbon emissions of all the first power supply areas ; S53. Add the absorbed electricity quantity E of the second power supply area within the area to be calculated imp,b,k to its power generation of grid-connected units at 220 kV and below E 220,b,k , multiply the sum by the corresponding power carbon dioxide emission factor EF of the second power supply area k,b to obtain the carbon emissions of each second power supply area, and sum up the carbon emissions of all the second power supply areas to obtain the carbon emissions of all the second power supply areas ; S54. Add the carbon emissions of all the first power supply areas to the carbon emissions of all the second power supply areas to obtain the total carbon emissions of the area to be calculated: ; S55. Add up the electricity consumption of all the first power supply areas E within the area to be calculated a to obtain the total electricity consumption of all the first power supply areas ; S56. Add the absorbed electricity quantity of each second power supply area within the area to be calculated to its power generation of grid-connected units at 220 kV and below to obtain the electricity consumption of each second power supply area, and add up the electricity consumption of all the second power supply areas to obtain the total electricity consumption of all the second power supply areas ; S57. Add the total electricity consumption of all the first power supply areas to the total electricity consumption of all the second power supply areas to obtain the total electricity consumption of the area to be calculated; S58. Take the ratio of the total carbon emissions of the area to be calculated and the total electricity consumption of the area to be calculated as the electricity carbon dioxide emission factor of the area to be calculated. The calculation formula is as follows: ; (5) Among them, EF xk represents the electricity carbon dioxide emission factor of area k to be calculated, a represents the number of the first power supply sub - areas, b represents the number of the second power supply sub - areas, E a represents the electricity consumption of the first power supply sub - area, EF k,a represents the electricity carbon dioxide emission factor of the first power supply sub - area, E imp,b,k represents the absorbed electricity of the second power supply sub - area, E 220,b,k represents the power generation of grid - connected units below 220 kV in the second power supply sub - area, EF k,b represents the electricity carbon dioxide emission factor of the second power supply sub - area.

[0058] In some embodiments, referring to Figure 5 , a device for calculating the electricity carbon dioxide emission factor of a region is provided, including: A division module 201, configured to perform grid division on the power supply area according to the distribution network topology structure, and take each obtained grid as a power supply sub - area; A data extraction module 202, configured to take the 500 kV substations in each power supply sub - area as convergence points, and extract power production data, electricity consumption data, and electricity interaction data; A convergence point calculation module 203, configured to calculate the electricity carbon dioxide emission factor of the current convergence point according to the power production data, electricity consumption data, and electricity interaction data; A first calculation module 204, configured to calculate the electricity carbon dioxide emission factor of the current power supply sub - area according to the electricity carbon dioxide emission factor of the current convergence point; A second calculation module 205, configured to calculate the electricity carbon dioxide emission factor of the area to be calculated based on the topological relationship between the area to be calculated and the power supply sub - areas, according to the electricity carbon dioxide emission factors of the relevant power supply sub - areas.

[0059] Furthermore, the power production data includes the power generation of grid - connected units above 500 kV and the power generation of grid - connected units below 220 kV, the electricity consumption data includes the electricity consumption of the power supply sub - area, and the electricity interaction data includes the electricity transferred into the convergence point through the UHV substation / converter station, the electricity directly transferred into the convergence point from other regions, and the electricity transferred from the convergence points of other power supply sub - areas into the current convergence point.

[0060] Furthermore, the convergence point calculation module 203 calculates the electricity carbon dioxide emission factor of the current convergence point according to the power production data, electricity consumption data, and electricity interaction data, including: Calculate the direct carbon emissions of grid-connected units at 500 kV and above in the current power supply area according to the power generation of grid-connected units at 500 kV and above at the current convergence point. Subtract the power transferred into the current convergence point through the UHV substation / converter station, the power directly transferred into the current convergence point from other regions, and the power transferred into the current convergence point from the convergence points of other power supply areas from the power consumption of the current power supply area to obtain the reverse power of grid-connected units at 220 kV and below in the current power supply area, and calculate the carbon emissions transferred into the current convergence point of grid-connected units at 220 kV and below in the current power supply area according to the reverse power. Calculate the average carbon dioxide emission factor of the UHV substation / converter station according to the power transferred into the current convergence point through the UHV substation / converter station and its source, and calculate the carbon emissions transferred into the current convergence point through the UHV substation / converter station according to the average carbon dioxide emission factor of the UHV substation / converter station. Calculate the average carbon dioxide emission factor of the corresponding other region according to the power directly transferred into the current convergence point from other regions and its source, and calculate the carbon emissions transferred into the current convergence point from other regions according to the average carbon dioxide emission factor of the corresponding other region. Calculate the carbon emissions transferred into the current convergence point from the convergence points of other power supply areas according to the power carbon dioxide emission factor of the convergence points of other power supply areas and the power transferred into the current convergence point. Calculate the power carbon dioxide emission factor of the current convergence point according to the power generation and direct carbon emissions of grid-connected units at 500 kV and above at the current convergence point, the reverse power of grid-connected units at 220 kV and below in the current power supply area and the carbon emissions transferred into the current convergence point, the carbon emissions and the power transferred into the current convergence point through the UHV substation / converter station, the carbon emissions and the power transferred into the current convergence point directly from other regions, and the carbon emissions and the power transferred into the current convergence point from the convergence points of other power supply areas.

[0061] Further, the convergence point calculation module 203 calculates the average carbon dioxide emission factor of the UHV substation / converter station according to the power transferred into the current convergence point through the UHV substation / converter station and its source, including: Search for the carbon dioxide emission factor of the output area of the power transferred into the current convergence point through the UHV substation / converter station, multiply the carbon dioxide emission factor of each output area by the corresponding power transferred into the current convergence point through the UHV substation / converter station respectively and then sum to obtain the total carbon emissions transferred into the current convergence point through the UHV substation / converter station. Obtain the sum of all the powers transferred into the current convergence point through the UHV substation / converter station. The ratio of the total carbon emissions transferred to the current convergence point via the UHV substation / converter station to the sum of all the electricity transferred to the current convergence point via the UHV substation / converter station is taken as the average carbon dioxide emission factor of the UHV substation / converter station.

[0062] Further, the convergence point calculation module 203 calculates the average carbon dioxide emission factor of the corresponding other region according to the electricity transferred directly from other regions to the current convergence point and its source, including: Search for the carbon dioxide emission factors of other regions corresponding to the electricity transferred directly to the current convergence point, multiply the carbon dioxide emission factor corresponding to each other region by the corresponding electricity transferred directly to the current convergence point respectively and then sum them up to obtain the total carbon emissions transferred directly from other regions to the current convergence point; Obtain the sum of all the electricity transferred directly from other regions to the current convergence point; The ratio of the total carbon emissions transferred directly from other regions to the current convergence point to the sum of all the electricity transferred directly from other regions to the current convergence point is taken as the average carbon dioxide emission factor of other regions.

[0063] Further, the convergence point calculation module 203 calculates the electricity carbon dioxide emission factor of the current convergence point, including: Add up the direct carbon emissions of the grid-connected units at 500 kV and above in the current power supply area, the carbon emissions transferred from the grid-connected units at 220 kV and below in the current power supply area to the current convergence point, the total carbon emissions transferred from all UHV substations / converter stations to the current convergence point, the total carbon emissions transferred directly from all other regions to the current convergence point, and the total carbon emissions transferred from the convergence points of all other power supply areas to the current convergence point to obtain the total carbon emissions of the current convergence point; Add up the power generation of the grid-connected units at 500 kV in the current power supply area, the reverse power transmission of the grid-connected units at 220 kV and below in the current power supply area, the sum of the electricity transferred from all UHV substations / converter stations to the current convergence point, the sum of the electricity transferred directly from all other regions to the current convergence point, and the sum of the electricity transferred from the convergence points of all other power supply areas to the current convergence point to obtain the total electricity of the current convergence point; The ratio of the total carbon emissions of the current convergence point to the total electricity of the current convergence point is taken as the electricity carbon dioxide emission factor of the current convergence point.

[0064] Further, the first calculation module 204 calculates the electricity carbon dioxide emission factor of the current power supply area according to the electricity carbon dioxide emission factor of the current convergence point, including: Add up the sum of the electricity transferred to the current convergence point from all UHV substations / converter stations, the sum of the electricity directly transferred to the current convergence point from all other regions, and the sum of the electricity transferred to the current convergence point from the convergence points of all other power supply areas to obtain the net transferred electricity sum of the current convergence point; Multiply the net transferred electricity sum of the current convergence point by the power carbon dioxide emission factor of the current convergence point to obtain the net transferred carbon emissions of the current convergence point; Calculate the direct carbon emissions of the grid-connected units at and below 220 kV in the current power supply area based on the power generation of the grid-connected units at and below 220 kV in the current power supply area; Add the net transferred carbon emissions of the current convergence point to the direct carbon emissions of the grid-connected units at and below 220 kV in the current power supply area to obtain the total carbon emissions of the current power supply area; Add the net transferred electricity of the current convergence point to the power generation of the grid-connected units at and below 220 kV in the current power supply area to obtain the total electricity of the current power supply area; Take the ratio of the total carbon emissions of the current power supply area to the total electricity of the current power supply area as the power carbon dioxide emission factor of the current power supply area.

[0065] Further, the second calculation module 205 calculates the power carbon dioxide emission factor of the area to be calculated based on the topological relationship between the area to be calculated and the power supply area, according to the power carbon dioxide emission factors of the relevant power supply areas, including: Determine the first power supply area that completely supplies power to the area to be calculated and the second power supply area that supplies power to the area to be calculated and other areas within the area to be calculated; Multiply the electricity consumption of each of the first power supply areas by the corresponding power carbon dioxide emission factor of the first power supply area and then sum them up to obtain the carbon emissions of all the first power supply areas; Add the absorbed electricity of the second power supply area within the area to be calculated to its power generation of the grid-connected units at and below 220 kV, and then multiply by the corresponding power carbon dioxide emission factor of the second power supply area to obtain the carbon emissions of each second power supply area. Add up the carbon emissions of all the second power supply areas to obtain the carbon emissions of all the second power supply areas; Add up the carbon emissions of all the first power supply areas and the carbon emissions of all the second power supply areas to obtain the total carbon emissions of the area to be calculated; Add up the electricity consumption of all the first power supply areas within the area to be calculated to obtain the total electricity consumption of all the first power supply areas; Add the absorbed electricity of each second power supply area within the area to be calculated to its power generation of the grid-connected units at and below 220 kV to obtain the electricity consumption of each second power supply area. Add up the electricity consumption of all the second power supply areas to obtain the total electricity consumption of all the second power supply areas; Add the total electricity consumption of all the first power supply zones and the total electricity consumption of all the second power supply zones to obtain the total electricity consumption of the area to be calculated; Take the ratio of the total carbon emissions of the area to be calculated to the total electricity consumption of the area to be calculated as the electricity carbon dioxide emission factor of the area to be calculated.

[0066] In some embodiments, there is also provided a computer storage medium storing multiple instructions that can be read and executed to implement the above method.

[0067] The method and device for calculating the regional electricity carbon dioxide emission factor provided by the above embodiments have at least the following beneficial effects: (1) Since the power supply structures of different power supply zones vary greatly, the access voltage levels and power generation amounts of power sources of different natures are different, according to the differences in the electricity nature of the electricity in the 500 kV power grid and the power grids of 220 kV and below, calculating carbon emissions and electricity carbon dioxide emission factors based on the electricity nature and weight ratio can fully reflect the power supply structure and electricity consumption characteristics, and effectively improve the accuracy of calculating the electricity carbon dioxide factor.

[0068] (2) Regarding the substations of 500 kV within the power supply zone as convergence points, with the convergence points of the power supply zones as the centers, calculating the converged electricity and electricity carbon factors at the convergence points, and then calculating the electricity carbon factors of the 220 kV zones according to the power transmitted from the 500 kV convergence points and the power generation amounts of 220 kV and below can more scientifically reflect the actual operating characteristics of the power system; (3) For the electricity transferred from other areas to the current area to be calculated, generally through three methods: converter stations, UHV channels, and direct transfer. Considering the nature of the external electricity serving the entire area, when calculating the electricity transferred from other areas, the electricity carbon dioxide emission factor is uniformly taken as the weighted average of its electricity carbon dioxide emission factors, which can better reflect the fairness of electricity consumption; (4) Based on the power supply zones, carrying out research and calculation on the regional electricity carbon dioxide emission factor will greatly simplify the relevant work content and steps, and can more truly reflect the power interaction topological relationship.

[0069] Although the preferred embodiments of the present invention have been described, those skilled in the art can make additional changes and modifications to these embodiments once they learn the basic creative concepts. Therefore, the appended claims are intended to be construed to include the preferred embodiments as well as all changes and modifications falling within the scope of the present invention. Obviously, those skilled in the art can make various changes and variations to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention also intends to include these modifications and variations.

Claims

1. A method for calculating the carbon dioxide emission factor of regional electricity, characterized in that, Including: According to the topology of the distribution network, the power supply area is divided into grids, and each obtained grid is used as a power supply sub-zone; Taking the 500 kV substations in each power supply sub-zone as convergence points, extracting power production data, power consumption data, and power quantity interaction data; Calculating the power carbon dioxide emission factor of the current convergence point according to the power production data, power consumption data, and power quantity interaction data; Calculating the power carbon dioxide emission factor of the current power supply sub-zone according to the power carbon dioxide emission factor of the current convergence point; Based on the topological relationship between the area to be calculated and the power supply sub-zone, calculating the power carbon dioxide emission factor of the area to be calculated according to the power carbon dioxide emission factor of the relevant power supply sub-zone.

2. The method according to claim 1, wherein The power supply sub-zones do not cross each other, and each power supply sub-zone realizes independent power supply, and each power supply sub-zone supplies power to one or more areas.

3. The method according to claim 1, characterized in that The power production data includes the power generation of grid-connected units of 500 kV and above and the power generation of grid-connected units of 220 kV and below. The power consumption data includes the power consumption of the power supply sub-zone. The power quantity interaction data includes the power quantity transferred into the convergence point through the UHV substation / converter station, the power quantity directly transferred into the convergence point from other areas, and the power quantity transferred from the convergence points of other power supply sub-zones into the current convergence point.

4. The method according to claim 1 or 3, characterized in that Calculating the power carbon dioxide emission factor of the current convergence point according to the power production data, power consumption data, and power quantity interaction data includes: Calculating the direct carbon emissions of grid-connected units of 500 kV and above in the current power supply sub-zone according to the power generation of grid-connected units of 500 kV and above in the current convergence point; Subtracting the power quantity transferred into the current convergence point through the UHV substation / converter station, the power quantity directly transferred into the current convergence point from other areas, and the power quantity transferred from the convergence points of other power supply sub-zones into the current convergence point from the power consumption of the current power supply sub-zone to obtain the reverse power transmission quantity of grid-connected units of 220 kV and below in the current power supply sub-zone, and calculating the carbon emissions transferred into the current convergence point by grid-connected units of 220 kV and below in the current power supply sub-zone according to the reverse power transmission quantity; Calculating the average carbon dioxide emission factor of the UHV substation / converter station according to the power quantity transferred into the current convergence point through the UHV substation / converter station and its source, and calculating the carbon emissions transferred into the current convergence point through the UHV substation / converter station according to the average carbon dioxide emission factor of the UHV substation / converter station; Calculating the average carbon dioxide emission factor of the corresponding other area according to the power quantity directly transferred into the current convergence point from other areas and its source, and calculating the carbon emissions transferred into the current convergence point from the corresponding other area according to the average carbon dioxide emission factor of the corresponding other area; Calculating the carbon emissions transferred from the convergence points of other power supply sub-zones into the current convergence point according to the power carbon dioxide emission factor of the convergence points of other power supply sub-zones and the power quantity transferred into the current convergence point; Calculate the power carbon dioxide emission factor of the current convergence point based on the power generation and direct carbon emissions of grid-connected units at 500 kV and above in the current power supply area, the reverse power of grid-connected units at 220 kV and below in the current power supply area, the carbon emissions transferred to the current convergence point, the carbon emissions and transferred power from the UHV substation / converter station to the current convergence point, the carbon emissions and transferred power directly transferred from other areas to the current convergence point, and the carbon emissions and transferred power from the convergence points of other power supply areas to the current convergence point.

5. The method according to claim 4, wherein Calculate the average carbon dioxide emission factor of the UHV substation / converter station based on the power transferred to the current convergence point through the UHV substation / converter station and its source, including: Find the carbon dioxide emission factor of the output area of the power transferred to the current convergence point through the UHV substation / converter station, multiply the carbon dioxide emission factor of each output area by the corresponding power transferred to the current convergence point through the UHV substation / converter station respectively, and then sum them up to obtain the total carbon emissions transferred to the current convergence point through the UHV substation / converter station; Calculate the sum of all the power transferred to the current convergence point through the UHV substation / converter station; Take the ratio of the total carbon emissions transferred to the current convergence point through the UHV substation / converter station to the sum of all the power transferred to the current convergence point through the UHV substation / converter station as the average carbon dioxide emission factor of the UHV substation / converter station.

6. The method according to claim 4, wherein Calculate the average carbon dioxide emission factor of the corresponding other areas based on the power directly transferred from other areas to the current convergence point and its source, including: Find the carbon dioxide emission factor of the other areas corresponding to the power directly transferred to the current convergence point, multiply the carbon dioxide emission factor of each other area by the corresponding power directly transferred to the current convergence point respectively, and then sum them up to obtain the total carbon emissions directly transferred from other areas to the current convergence point; Calculate the sum of all the power directly transferred from other areas to the current convergence point; Take the ratio of the total carbon emissions directly transferred from other areas to the current convergence point to the sum of all the power directly transferred from other areas to the current convergence point as the average carbon dioxide emission factor of the other areas.

7. The method according to claim 4, characterized in that, Calculate the power carbon dioxide emission factor of the current convergence point, including: Add up the direct carbon emissions of grid-connected units at 500 kV and above in the current power supply area, the carbon emissions transferred from grid-connected units at 220 kV and below in the current power supply area to the current convergence point, the total carbon emissions transferred from all UHV substations / converter stations to the current convergence point, the total carbon emissions directly transferred from all other areas to the current convergence point, and the total carbon emissions transferred from the convergence points of all other power supply areas to the current convergence point to obtain the total carbon emissions of the current convergence point; Add up the power generation of grid-connected units at 500 kV in the current power supply area, the reverse power of grid-connected units at 220 kV and below in the current power supply area, the sum of the power transferred from all UHV substations / converter stations to the current convergence point, the sum of the power directly transferred from all other areas to the current convergence point, and the sum of the power transferred from the convergence points of all other power supply areas to the current convergence point to obtain the total power of the current convergence point; Take the ratio of the total carbon emissions of the current convergence point to the total electricity consumption of the current convergence point as the power carbon dioxide emission factor of the current convergence point.

8. The method according to claim 4, characterized in that, Calculate the power carbon dioxide emission factor of the current power supply area based on the power carbon dioxide emission factor of the current convergence point, including: Add up the electricity transferred into the current convergence point by all UHV substations / converter stations, the electricity directly transferred into the current convergence point from all other regions, and the electricity transferred into the current convergence point by the convergence points of all other power supply areas to obtain the net transferred-in electricity sum of the current convergence point; Multiply the net transferred-in electricity sum of the current convergence point by the power carbon dioxide emission factor of the current convergence point to obtain the net transferred-in carbon emissions of the current convergence point; Calculate the direct carbon emissions of the grid-connected units below 220 kV in the current power supply area based on the power generation of the grid-connected units below 220 kV in the current power supply area; Add the net transferred-in carbon emissions of the current convergence point to the direct carbon emissions of the grid-connected units below 220 kV in the current power supply area to obtain the total carbon emissions of the current power supply area; Add the net transferred-in electricity of the current convergence point to the power generation of the grid-connected units below 220 kV in the current power supply area to obtain the total electricity of the current power supply area; Take the ratio of the total carbon emissions of the current power supply area to the total electricity of the current power supply area as the power carbon dioxide emission factor of the current power supply area.

9. The method according to claim 1, characterized in that, Based on the topological relationship between the area to be calculated and the power supply area, calculate the power carbon dioxide emission factor of the area to be calculated according to the power carbon dioxide emission factors of the relevant power supply areas, including: Determine the first power supply areas that supply power only to the area to be calculated and the second power supply areas that supply power to the area to be calculated and other areas within the area to be calculated; Multiply the electricity consumption of each of the first power supply areas by the corresponding power carbon dioxide emission factor of the first power supply area and then sum them up to obtain the carbon emissions of all the first power supply areas; Add the electricity consumption within the area to be calculated of the second power supply area to the power generation of its grid-connected units below 220 kV, then multiply the result by the corresponding power carbon dioxide emission factor of the second power supply area to obtain the carbon emissions of each second power supply area, and sum up the carbon emissions of all the second power supply areas to obtain the carbon emissions of all the second power supply areas; Add the carbon emissions of all the first power supply areas to the carbon emissions of all the second power supply areas to obtain the total carbon emissions of the area to be calculated; Add up the electricity consumption of all the first power supply areas within the area to be calculated to obtain the total electricity consumption of all the first power supply areas; Add the electricity consumption within the area to be calculated of each second power supply area to the power generation of its grid-connected units below 220 kV to obtain the electricity consumption of each second power supply area, and sum up the electricity consumption of all the second power supply areas to obtain the total electricity consumption of all the second power supply areas; Add the total electricity consumption of all the first power supply areas and the total electricity consumption of all the second power supply areas to obtain the total electricity consumption of the area to be calculated; Take the ratio of the total carbon emissions of the area to be calculated to the total electricity consumption of the area to be calculated as the power carbon dioxide emission factor of the area to be calculated.

10. A regional power carbon dioxide emission factor calculation device, characterized in that, Including: A division module, configured to perform grid division on a power supply area according to the distribution network topology structure, and use each obtained grid as a power supply subarea; A data extraction module, configured to use the 500 kV substations in each power supply subarea as aggregation points, and extract power production data, power consumption data, and power quantity interaction data; An aggregation point calculation module, configured to calculate the power carbon dioxide emission factor of the current aggregation point according to the power production data, power consumption data, and power quantity interaction data; A first calculation module, configured to calculate the power carbon dioxide emission factor of the current power supply subarea according to the power carbon dioxide emission factor of the current aggregation point; A second calculation module, configured to calculate the power carbon dioxide emission factor of the area to be calculated according to the power carbon dioxide emission factor of the relevant power supply subarea based on the topological relationship between the area to be calculated and the power supply subarea.

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