A network topology-based accounting method for carbon reduction of cross-provincial green power transmission

Abstract

The application discloses a kind of green power carbon reduction quantity accounting methods of inter-provincial transmission based on network topology, belong to carbon emission accounting technical field.The method includes: determining carbon reduction quantity accounting object, accounting space-time boundary and accounting basic mode;Based on inter-provincial power exchange data, construct the power transmission network topology model with provincial power grid as node, with power transmission relationship between power grid as directed edge;Based on accounting parameter, calculate the carbon reduction quantity basic accounting unit corresponding to each directed edge in power transmission network topology model;All carbon reduction quantity basic accounting units related to basic mode are executed directional aggregation operation, and the target carbon reduction quantity is output.The present application can realize standardization accounting to carbon reduction quantity in the discretization green power inter-provincial transmission scene, provide scientific, efficient quantification method for accounting carbon reduction quantity of green power inter-provincial transmission, provide reliable data source for quantifying ecological value of green power inter-provincial transmission and dividing regional carbon reduction responsibility.

Description

Technical Field

[0001] This invention relates to the field of carbon emission accounting technology, and in particular to a method for calculating the carbon reduction of cross-provincial green electricity transmission based on network topology. Background Technology

[0002] With the significant progress made in the development of green energy in China, represented by hydropower, wind power, and solar power, the transmission of green electricity across provincial power grids has become a key means to optimize energy resource allocation, promote the consumption of renewable energy, and help achieve the "dual carbon" target.

[0003] Fairly and reasonably calculating the carbon reduction contribution of inter-provincial green power transmission is a core basis for quantifying the ecological value of green power, delineating regional carbon reduction responsibilities, and promoting horizontal ecological compensation. However, currently, in the scenario of inter-provincial green power transmission, there is a lack of a fair and effective method to quantify its carbon reduction. Existing technologies mainly face the following difficulties: First, the calculation principle is biased. Existing calculation techniques mostly trace and allocate carbon emissions from power production within the sending-end grid, ignoring the real carbon reduction mechanism of green power replacing fossil fuel power in the receiving-end grid after being transmitted across provinces. This leads to a misaligned calculation perspective and makes it impossible to accurately calculate the actual carbon reduction contribution of inter-provincial green power transmission. Second, the models are complex and lack practicality. Existing technologies are mostly based on carbon emission flow tracking such as power flow calculations. First, existing methods attempt to trace carbon flow paths using complex power grid physical models. However, these methods rely on detailed real-time power flow data and grid topology, resulting in high computational costs and making them unsuitable for cross-provincial power grids and the ongoing needs of macro-policy accounting and management. Second, they cannot handle complex network relationships. Most existing methods are limited to isolated "point-to-point" power transmission scenarios. In actual cross-provincial power transmission, which involves massive and discrete "one-to-many" and "many-to-one" transmission relationships, it is difficult to systematically solve the problem of calculating the carbon reduction of green electricity transmitted across provincial power grids, where one sending end corresponds to multiple receiving ends or one receiving end aggregates multiple sending ends. Therefore, for the specific scenario of green electricity transmission across provincial power grids, it is necessary to provide a carbon reduction calculation method that accurately reflects the carbon reduction essence of "receiving end substitution," efficiently handles complex network relationships, and matches provincial management needs to solve the above-mentioned technical problems. Summary of the Invention

[0004] To address the aforementioned issues, this invention provides a method for calculating the carbon reduction of green electricity transmitted across provincial borders based on network topology, which is applicable to accurately calculating the carbon reduction of green electricity transmitted across provincial power grids.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a method for calculating the carbon reduction of cross-provincial green electricity transmission based on network topology, specifically including the following steps: S1. Determine the objects, spatial and temporal boundaries, and basic accounting models for carbon reduction accounting; The accounting object is clearly defined, namely, the amount of green electricity transmitted across provincial power grids.

[0006] The accounting spatial boundary between the sending-end provincial power grid and the receiving-end provincial power grid is determined, which clarifies the complete scope of the carbon reduction calculation for cross-provincial green electricity transmission.

[0007] The computational spatiotemporal boundary includes spatial boundary and temporal boundary; The aforementioned accounting spatial boundary divides the scope of carbon reduction accounting for cross-provincial green electricity transmission into three types, such as... Figure 2 As shown, it includes: (1) a “link-type” mode in which one sending-end provincial power grid corresponds to one receiving-end provincial power grid, representing the carbon reduction contribution corresponding to one sending-end province transmitting green electricity to one receiving-end province; (2) a “distribution-type” mode in which one sending-end provincial power grid corresponds to multiple receiving-end provincial power grids, representing the total carbon reduction contribution corresponding to one sending-end province transmitting green electricity to the outside world; (3) a “convergence-type” mode in which multiple sending-end provincial power grids correspond to one receiving-end provincial power grid, representing the total carbon reduction benefit corresponding to one receiving-end province receiving green electricity from multiple provinces outside the provincial boundary.

[0008] Determine the time boundaries for accounting, including annual and monthly periods.

[0009] S2. Based on cross-provincial power exchange data, construct a power transmission network topology model with provincial power grids as nodes and inter-power grid power transmission relationships as directed edges; Analyze inter-provincial power exchange data, primarily based on provincial power grids, and construct a directed graph-based topology model of the inter-provincial power transmission network. .in: G This represents the network topology for power transmission between provincial power grids; V ={ v 1, v 2, ..., v n} represents a set of nodes, where each node v i ( i =1, 2, ..., n This represents a provincial power grid participating in inter-provincial power exchange; E ={ e ( i , j )∣ i , j ∈ V} represents the set of directed edges, where each directed edge... e ( i , j )∈E If and only if there exists a sender node v i to the receiving node v j The power transmission relationship.

[0010] Each directed edge e ( i , j Associate a power transmission attribute C i→j , indicating the sending node v i To the receiving node v j Total electricity transmitted to the grid.

[0011] S3. Obtain the accounting parameters associated with the power transmission network topology model; This invention addresses the organizational calculation parameters of the constituent elements involved in the provincial power transmission network topology model G constructed for S2: For each node v i The parameters involved in the data collection node include: if it is a sending node, the total power generation of the associated sending node. G total，i Green power generation G green，i If acting as the receiving end, the associated receiving end node's electricity carbon dioxide emission factor. EF electricity，i For each directed edge e ( i , j The associated parameter, namely the amount of electricity transmitted. C i→j Set the system's general parameters, namely the overall line loss rate. k .

[0012] S4. Based on the accounting parameters, calculate the basic accounting unit for carbon reduction corresponding to each directed edge in the power transmission network topology model. This invention establishes a carbon reduction accounting unit for transmitting green electricity from a single sending-end node to a single receiving-end node, such as... Figure 3 As shown, it serves as the basic accounting unit for indivisible carbon reduction. The proportion of green electricity in the transmitted electricity is calculated according to the sending-end node. v i The ratio of green power generation to total power generation is determined, and the carbon reduction from "receiving-end substitution" green electricity is calculated by substituting green electricity transmitted from sending-end nodes for that transmitted green electricity at receiving-end nodes. v j Fossil fuel electricity is determined. The formula is as follows: (1) In the formula: △ r ij For the sending node v i To the receiving node v j The carbon reduction from transmitting green electricity is measured in tons of carbon dioxide (tCO2). C i→j For the sending node v i To the receiving node v j The total amount of electricity transmitted to the grid, measured in megawatt-hours (MWh). G green,i Green power generation at the sending-end node includes power generation from non-fossil energy sources such as wind, solar, hydro, nuclear, and biomass, expressed in megawatt-hours (MWh). G total,i For the sending node v i Total electricity generation, including electricity generated from fossil fuels and non-fossil fuels such as thermal, wind, solar, hydro, nuclear, and biomass, is measured in megawatt-hours (MWh). k The comprehensive line loss rate of the power system caused by transmission, transformation, and distribution, expressed in % (%). EF electricity，j For the receiving node v j The carbon dioxide emission factor for electricity is expressed in tons of carbon dioxide per megawatt-hour (tCO2 / MWh).

[0013] S5. Based on the basic model and the power transmission network topology model, perform targeted aggregation operations on all carbon reduction basic accounting units related to the basic model, output the target carbon reduction, and complete the cross-provincial green power transmission carbon reduction accounting method.

[0014] Based on the specific requirements for calculating the carbon reduction of green electricity transmitted across provinces, this invention selects one of the following aggregation rules to aggregate the results of the basic accounting unit obtained in S4.

[0015] Rule R1 (Link Aggregation Mode): Directly outputs the specified directed edge. e ( i , j The corresponding carbon reduction amount Δ r ij It is used to calculate the carbon reduction contribution of a single specified transport path.

[0016] Rule R2 (Distributed Aggregation Mode): For the specified sending node v iThe total carbon reduction contribution of the outgoing power grid is calculated by aggregating the carbon reduction amounts corresponding to all its outgoing edges, resulting in the total carbon reduction contribution of the provincial power grid at the sending end to transmit green electricity. The formula is as follows: (2) In the formula: Indicates the specified sending node v i The total carbon reduction contribution of transmitting green electricity to other countries, expressed in tons of carbon dioxide (tCO2).

[0017] Rule R3 (Inflow Aggregation Mode): For the specified receiving node v j The total carbon reduction benefit from the incoming power grid is calculated by aggregating the carbon reduction amounts corresponding to all incoming edges, resulting in the total carbon reduction benefit of the receiving provincial power grid receiving green electricity from outside the provincial boundary. The formula is as follows: (3) In the formula: Indicates the specified receiving node v j The total carbon reduction benefit from receiving green electricity is expressed in tons of carbon dioxide (tCO2).

[0018] Compared with existing technologies, this invention provides a method for calculating the carbon reduction of cross-provincial green electricity transmission based on network topology, which has the following beneficial effects: This invention provides a method for calculating the carbon reduction of cross-provincial green electricity transmission based on network topology. It fully considers the real carbon reduction mechanism of the "receiving-end substitution" effect, simplifies the handling of complex network relationships between provincial power grids, and matches the carbon reduction calculation requirements with provincial management needs. By constructing a three-tiered technical architecture—from network topology modeling to basic unit calculation and then to targeted rule aggregation—it establishes a lightweight cross-provincial power grid transmission network topology model. It clarifies the calculation unit based on dual-end calibration of the green electricity ratio at the sending end and the electricity emission factor at the receiving end, forming a scientifically sound, clearly structured, and demand-adaptive cross-provincial green electricity carbon reduction calculation system. This solves the problem of neglecting the carbon reduction mechanism of green electricity substituting for fossil fuel power in the receiving-end power grid under conventional calculation methods. It achieves standardized and efficient calculation of carbon reduction in large-scale, discrete cross-provincial green electricity transmission scenarios, providing a scientific and efficient quantitative method for calculating the carbon reduction of cross-provincial green electricity transmission. It also provides a fair and reliable data source for quantifying the ecological value of cross-provincial green electricity transmission, delineating regional carbon reduction responsibilities, and promoting horizontal ecological compensation. Attached Figure Description

[0019] Figure 1 This is a flowchart illustrating a method for calculating the carbon reduction of cross-provincial green electricity transmission based on network topology, according to the present invention. Figure 2 This is a schematic diagram of the node relationships of a provincial power grid based on a network topology model according to the present invention; Figure 3 This is a schematic diagram illustrating the calculation of carbon reduction in cross-provincial green electricity transmission according to the present invention. Detailed Implementation

[0020] The technical solution of the present invention will be clearly and completely described below with reference to specific embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] Example 1 like Figure 1 A method for calculating the carbon reduction of cross-provincial green electricity transmission based on network topology includes the following steps: This embodiment takes the calculation of the carbon reduction contribution of green electricity transmission from YN province to GD province as an example to calculate the carbon reduction of green electricity transmission across provinces.

[0022] (1) The accounting object is clearly defined as the green power transmission volume corresponding to the green power transmission behavior from YN provincial power grid to GD provincial power grid. The green power transmission from YN province to GD province is determined to be a "link-type" model with one sending provincial power grid corresponding to one receiving provincial power grid. The accounting period is determined to be 2021.

[0023] (2) Analyze the inter-provincial power exchange data from the YN provincial power grid to the GD provincial power grid, and construct a directed graph-form power transmission network topology model from the YN provincial power grid to the GD provincial power grid. .in, V ={ v 1, v 2}, v 1. v 2 represents the YN provincial power grid and the GD provincial power grid, respectively; E ={ e ( i , j )∣ i , j ∈ V}, e ( i , j Associated with 1 power transmission attribute C 1→2 This represents the amount of electricity transmitted across provincial borders from the YN provincial power grid to the GD provincial power grid.

[0024] (3) Based on the determined power transmission network topology model Collect and calculate parameters. These include: the total power generation of the sending-end node YN provincial power grid. G total，1 This includes power generation from thermal, hydro, solar, and wind power; and green power generation from the sending-end node YN provincial power grid. G green，1 This includes power generation from hydropower, photovoltaic, and wind power; and the carbon dioxide emission factor of electricity from the GD provincial power grid at the receiving end node. EF electricity，2 The amount of electricity transmitted from the YN provincial power grid to the GD provincial power grid via the directed edge e(i,j) is connected to the grid. C 1→2 Comprehensive line loss rate of power grid system k .

[0025] Table 1: Parameters for calculating the carbon reduction of green electricity transmitted from Yunnan Province to Guangdong Province (4) Determine the calculation unit for the carbon reduction of green electricity transmission from YN Province to GD Province, using the following formula: In the formula: C 1→2 This represents the amount of electricity transmitted from the YN provincial power grid to the GD provincial power grid in 2021, expressed in MWh. G green，1 This represents the green electricity generation of the YN provincial power grid in 2021, including hydropower, photovoltaic, and wind power generation, in MWh. G total，1 This represents the total power generation of the YN provincial power grid in 2021, including power generation from thermal, hydropower, photovoltaic, and wind power, and is expressed in MWh. k This represents the comprehensive line loss rate of the power grid system in 2021, expressed in % (%). EF electricity，2 This represents the carbon dioxide emission factor of the GD provincial power grid in 2021, expressed in tCO2 / MWh.

[0026] According to calculations, in 2021, the carbon reduction corresponding to the transmission of green electricity from YN Province to GD Province was 5.24 × 10⁻⁶. 7 tCO2.

[0027] (5) Based on the established "link-type" model of one sending-end provincial power grid corresponding to one receiving-end provincial power grid, rule R1 (link-type aggregation) is implemented, that is, YN province achieved 5.24 × 10 in 2021 by transmitting green electricity to GD province and replacing fossil energy electricity in GD province. 7 The carbon reduction contribution of tCO2.

[0028] Example 2 like Figure 1 A method for calculating the carbon reduction of cross-provincial green electricity transmission based on network topology includes the following steps: This embodiment takes the carbon reduction contribution of green electricity transmission from YN province to SC, GD and GX provinces as an example to calculate the carbon reduction of green electricity transmission across provinces.

[0029] (1) The accounting object is defined as the green electricity transmission volume corresponding to the green electricity transmission behavior of YN provincial power grid to SC, GD and GX provincial power grids. The green electricity transmission from YN province to SC, GD and GX province is determined to be a "distributed" model with one sending provincial power grid corresponding to multiple receiving provincial power grids. The accounting period is determined to be 2022.

[0030] (2) Analyze the inter-provincial power exchange data from the YN provincial power grid to the SC, GD, and GX provincial power grids, and construct a directed graph-form power transmission network topology model of the YN provincial power grid to the SC, GD, and GX provincial power grids. .in, V ={ v 1, v 2, v 3, v 4}, v 1. v 2. v 3. v 4 represents the YN provincial power grid, SC provincial power grid, GD provincial power grid, and GX provincial power grid, respectively. E ={ e ( i , j )∣ i , j ∈ V}, e ( i , j Associated with 3 transmitted power attributes C 1→2 , C 1→3 , C 1→4 This represents the amount of electricity transmitted across provincial borders from the YN provincial power grid to the SC, GD, and GX provincial power grids.

[0031] (3) Based on the determined power transmission network topology model Collect and calculate parameters. These include: the total power generation of the sending-end node YN provincial power grid. G total，1 This includes power generation from thermal, hydro, solar, and wind power; and green power generation from the sending-end node YN provincial power grid. G green，1This includes power generation from hydropower, photovoltaic, and wind power; and the carbon dioxide emission factors of electricity from the three provincial power grids at the receiving end nodes SC, GD, and GX. EF electricity，2 , EF electricity，3 , EF electricity，4 The amount of electricity transmitted from the YN provincial power grid to the SC, GD, and GX provincial power grids via the directed edge e(i,j) is fed into the grid. C 1→2 , C 1→3 , C 1→4 Comprehensive line loss rate of power grid system k .

[0032] Table 2: Calculation parameters for carbon reduction of green electricity transmitted from Yunnan Province to Sichuan, Guangdong, and Guangxi provinces. (4) Determine the calculation unit for the carbon reduction of green electricity transmission from YN Province to SC Province, using the following formula: In the formula: C 1→2 This represents the amount of electricity transmitted from the YN provincial power grid to the SC provincial power grid in 2022, expressed in MWh. G green，1 This represents the green electricity generation of the YN provincial power grid in 2022, including hydropower, photovoltaic, and wind power generation, in MWh. G total，1 This represents the total power generation of the YN provincial power grid in 2022, including thermal, hydropower, photovoltaic, and wind power generation, in MWh. k The comprehensive line loss rate of the power grid system in 2022 is expressed in % (%). EF electricity，2 This represents the carbon dioxide emission factor of the SC provincial power grid in 2022, expressed in tCO2 / MWh.

[0033] The calculation unit for the carbon reduction of green electricity transmission from YN Province to GD Province is determined by the following formula: In the formula: C 1→3 This represents the amount of electricity transmitted from the YN provincial power grid to the GD provincial power grid in 2022, expressed in MWh. G green，1 This represents the green electricity generation of the YN provincial power grid in 2022, including hydropower, photovoltaic, and wind power generation, in MWh. Gtotal，1 This represents the total power generation of the YN provincial power grid in 2022, including thermal, hydropower, photovoltaic, and wind power generation, in MWh. k The comprehensive line loss rate of the power grid system in 2022 is expressed in % (%). EF electricity，3 This represents the carbon dioxide emission factor of the GD provincial power grid in 2022, expressed in tCO2 / MWh.

[0034] The calculation unit for the carbon reduction of green electricity transmission from YN Province to GX Province is determined by the following formula: In the formula: C 1→4 This represents the amount of electricity transmitted from the YN provincial power grid to the GX provincial power grid in 2022, expressed in MWh. G green，1 This represents the green electricity generation of the YN provincial power grid in 2022, including hydropower, photovoltaic, and wind power generation, in MWh. G total，1 This represents the total power generation of the YN provincial power grid in 2022, including thermal, hydropower, photovoltaic, and wind power generation, in MWh. k The comprehensive line loss rate of the power grid system in 2022 is expressed in % (%). EF electricity，4 This represents the carbon dioxide emission factor of the GX provincial power grid in 2022, expressed in tCO2 / MWh.

[0035] According to calculations, in 2022, the carbon reduction corresponding to the transmission of green electricity from YN Province to SC Province was 5.33 × 10⁻⁶. 6 The carbon reduction corresponding to the transmission of green electricity from Yunnan Province to Guangdong Province is 4.71 × 10⁻⁶ tCO₂. 7 The carbon reduction corresponding to the transmission of green electricity from Yunnan Province to Guangdong Province is 2.53 × 10⁻⁶ tCO₂. 6 tCO2.

[0036] (5) Based on the determined "distributed" model of one sending-end provincial power grid corresponding to multiple receiving-end provincial power grids, rule R2 (distributed aggregation) is executed, that is, the carbon reduction corresponding to all its outgoing edges is aggregated to obtain the total carbon reduction contribution corresponding to the green electricity transmitted by the sending-end provincial power grid. The formula is: According to calculations, the total carbon reduction corresponding to the green electricity transmitted by Yunnan Province to other regions in 2022 was 5.50 × 10⁻⁶. 7tCO2. That is, YN province achieved 5.50 × 10⁻⁶ in 2022 by transmitting green electricity to SC, GD, and GX provinces and replacing fossil fuel electricity in those three provinces. 7 The total carbon reduction contribution of tCO2.

[0037] Example 3 like Figure 1 A method for calculating the carbon reduction of cross-provincial green electricity transmission based on network topology includes the following steps: This embodiment takes the calculation of carbon reduction benefits from green electricity transmitted from JS, ZJ and XJ provinces to AH province as an example to calculate the carbon reduction of green electricity transmitted across provinces.

[0038] (1) The accounting object is clearly defined as the green power transmission volume corresponding to the green power transmission behavior of the three provincial power grids (JS, ZJ, and XJ) to the provincial power grid (AH). The green power transmission from the three provinces (JS, ZJ, and XJ) to the province (AH) is determined to be a "convergence type" model with multiple sending provincial power grids corresponding to one receiving provincial power grid. The accounting period is determined to be the year 2022.

[0039] (2) Analyze the inter-provincial power exchange data from the three provincial power grids JS, ZJ, and XJ to the provincial power grid AH, and construct a directed graph-form power transmission network topology model of the three provincial power grids JS, ZJ, and XJ to the provincial power grid AH. .in, V ={ v 1, v 2, v 3, v 4}, v 1. v 2. v 3. v 4 represents the JS provincial power grid, ZJ provincial power grid, XJ provincial power grid, and AH provincial power grid, respectively. E ={ e ( i , j )∣ i , j ∈ V}, e ( i , j Associated with 3 transmitted power attributes C 1→4 , C 2→4 , C 3→4 This represents the amount of electricity transmitted across provincial borders from the three provincial power grids (JS, ZJ, and XJ) to the AH provincial power grid.

[0040] (3) Based on the determined power transmission network topology model Collect and calculate parameters. This includes the total power generation of the three provincial power grids at the sending-end nodes: JS, ZJ, and XJ. G total，1 , G total，2 , G total，2 This includes power generation from thermal, hydro, solar, wind, and nuclear power sources; and green power generation from the three provincial power grids of JS, ZJ, and XJ at the sending-end nodes. G green，1 , G green，2 , G green，2 This includes power generation from hydropower, photovoltaic, wind power, and nuclear power; and the carbon dioxide emission factor of electricity from the AH provincial power grid at the receiving end node. EF electricity，4 The amount of electricity transmitted to the AH provincial power grid by the three provincial power grids JS, ZJ, and XJ associated with the directed edge e(i,j) is the amount of electricity supplied to the AH provincial power grid. C 1→4 , C 2→4 , C 3→4 Comprehensive line loss rate of power grid system k .

[0041] Table 3: Calculation parameters for carbon reduction of green electricity transmitted from JS, ZJ, and XJ provinces to AH province (4) Determine the calculation unit for the carbon reduction of green electricity transmission from JS Province to AH Province, using the following formula: In the formula: C 1→4 This represents the amount of electricity transmitted from the JS provincial power grid to the AH provincial power grid in 2022, expressed in MWh. G green，1 This represents the green electricity generation of the JS provincial power grid in 2022, including hydropower, photovoltaic, wind power, nuclear power, etc., and is expressed in MWh. G total，1 This represents the total power generation of the JS provincial power grid in 2022, including thermal, hydropower, photovoltaic, wind, and nuclear power generation, in MWh. k The comprehensive line loss rate of the power grid system in 2022 is expressed in % (%). EF electricity，4 This represents the carbon dioxide emission factor of the AH provincial power grid in 2022, expressed in tCO2 / MWh.

[0042] The calculation unit for the carbon reduction of green electricity transmission from ZJ Province to AH Province is determined by the following formula: In the formula: C 2→4 This represents the amount of electricity transmitted from the ZJ provincial power grid to the AH provincial power grid in 2022, expressed in MWh. G green，2 This represents the green electricity generation of the ZJ provincial power grid in 2022, including hydropower, photovoltaic, and wind power generation, in MWh. G total，2 This represents the total power generation of the ZJ provincial power grid in 2022, including thermal, hydropower, photovoltaic, and wind power generation, in MWh. k The comprehensive line loss rate of the power grid system in 2022 is expressed in % (%). EF electricity，4 This represents the carbon dioxide emission factor of the AH provincial power grid in 2022, expressed in tCO2 / MWh.

[0043] The calculation unit for the carbon reduction of green electricity transmission from XJ Province to AH Province is determined by the following formula: In the formula: C 3→4 This represents the amount of electricity transmitted from the XJ provincial power grid to the AH provincial power grid in 2022, expressed in MWh. G green，3 This represents the green electricity generation of the XJ provincial power grid in 2022, including hydropower, photovoltaic, and wind power generation, in MWh. G total，3 This represents the total power generation of the XJ provincial power grid in 2022, including thermal, hydropower, photovoltaic, and wind power generation, in MWh. k The comprehensive line loss rate of the power grid system in 2022 is expressed in % (%). EF electricity，4 This represents the carbon dioxide emission factor of the AH provincial power grid in 2022, expressed in tCO2 / MWh.

[0044] According to calculations, in 2022, the carbon reduction corresponding to the transmission of green electricity from JS Province to AH Province was 1.91 × 10⁻⁶. 5 The carbon reduction corresponding to the transmission of green electricity from Zhejiang Province to Henan Province is 4.89 × 10⁻⁶ tCO₂. 3 The carbon reduction corresponding to the transmission of green electricity from XJ province to AH province is 9.40 × 10⁻⁶ tCO₂. 6 tCO2.

[0045] (5) Based on the determined "inflow-type" mode of multiple sending-end provincial power grids corresponding to one receiving-end provincial power grid, rule R3 (inflow-type aggregation) is executed, that is, the carbon reduction corresponding to all its incoming edges is aggregated to obtain the total carbon reduction benefit of the receiving-end provincial power grid receiving green electricity outside the provincial boundary, as shown in the following formula: According to calculations, the total carbon reduction corresponding to the green electricity received by AH Province in 2022 was 9.59 × 10⁻⁶. 6 tCO2. That is, AH province achieved 9.59 × 10⁻⁶ tCO2 in 2022 by receiving green electricity from JS, ZJ, and XJ provinces and replacing AH province's fossil fuel power. 6 Total carbon reduction benefit of tCO2.

[0046] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A method for calculating the carbon reduction of cross-provincial green electricity transmission based on network topology, characterized in that, Includes the following steps: S1. Determine the objects, spatial and temporal boundaries, and basic accounting models for carbon reduction accounting; The accounting object is the amount of green electricity transmitted across provincial power grids; S2. Based on cross-provincial power exchange data, construct a power transmission network topology model with provincial power grids as nodes and inter-power grid power transmission relationships as directed edges; S3. Obtain the accounting parameters associated with the power transmission network topology model; The calculation parameters include the total power generation of the associated sending-end node, the green power generation, the carbon dioxide emission factor of the receiving-end node, the transmitted power, and the comprehensive line loss rate. S4. Based on the accounting parameters, calculate the basic accounting unit for carbon reduction corresponding to each directed edge in the power transmission network topology model. S5. Based on the basic accounting model and the power transmission network topology model, perform targeted aggregation operations on all carbon reduction basic accounting units related to the basic model, output the target carbon reduction, and complete the carbon reduction accounting for cross-provincial green power transmission.

2. The method for calculating the carbon reduction of cross-provincial green electricity transmission based on network topology as described in claim 1, characterized in that, In S1, the basic accounting modes specifically include: a link-type mode where one sending-end provincial power grid corresponds to one receiving-end provincial power grid, a dispersing-type mode where one sending-end provincial power grid corresponds to a preset number of receiving-end provincial power grids, and a merging-type mode where a preset number of sending-end provincial power grids correspond to one receiving-end provincial power grid.

3. The method for calculating the carbon reduction of cross-provincial green electricity transmission based on network topology as described in claim 1, characterized in that, In S4, the calculation expression for the basic carbon reduction accounting unit is as follows: In the formula, C i→j For the sending node v i To the receiving node v j Total electricity transmitted to the grid; Green power generation at the sending-end node; For the sending node v i Total power generation; k This refers to the overall line loss rate; EF electricity，j For the receiving node v j Carbon dioxide emission factor for electricity.

4. The method for calculating the carbon reduction of cross-provincial green electricity transmission based on network topology as described in claim 1, characterized in that, In S5, the directional aggregation operation includes three rules, as follows: (1) Rule R1 corresponds to the link-type pattern in the basic pattern: directly output the specified directed edge. e ( i , j The corresponding basic accounting unit for carbon reduction Δ r ij It is used to calculate the carbon reduction contribution of a single specified transport path; (2) Rule R2 corresponds to the spread-out pattern in the basic mode: for the specified sending node v i Calculate the sending node v i The total carbon reduction contribution from distributed generation is obtained by calculating the total carbon reduction contribution of green electricity transmitted from the sending-end provincial power grid. The calculation formula is as follows: In the formula, This serves as the basic accounting unit for carbon reduction. E ={ e ( i , j )∣ i , j ∈ V } represents the set of directed edges; V A set of nodes; (3) Rule R3 corresponds to the import mode in the basic mode: for the specified receiving node v j Accounting for the receiving node v j The total carbon reduction benefit from inflow is obtained by calculating the total carbon reduction benefit of the receiving provincial power grid receiving green electricity from outside the provincial boundary, using the following formula: In the formula, This serves as the basic accounting unit for carbon reduction. E ={ e ( i , j )∣ i , j ∈ V } represents the set of directed edges; V For a set of nodes, i , j ∈ V ,and .

5. The method for calculating the carbon reduction of cross-provincial green electricity transmission based on network topology as described in claim 3, characterized in that, The carbon reduction basic accounting unit represents the carbon dioxide emission reduction generated by green electricity transmitted at the sending-end node replacing fossil fuel electricity at the receiving-end node.

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