A method, system and storage medium for calculating carbon emissions from load-side electricity consumption

Abstract

The present invention discloses a method, system and storage medium for calculating carbon emissions from electricity consumption on the load side. The method first calculates the carbon emissions per unit electricity of the transmission line based on the proportion of primary energy electricity at each line collection point and power generation grid connection point on the transmission line. Then, starting from the electricity consumption side, the carbon emissions of the transmission line are calculated based on the transmission electricity on each transmission line. Finally, the carbon emissions of the primary energy electricity on the load side are calculated based on the carbon emissions per unit electricity of the transmission line connected to the load side receiving point and the actual electricity consumption on the load side. The present invention solves the problem that the load side main body cannot currently perform effective calculations and can only spread carbon emissions. It can accurately divide the line collection point and the load side receiving point, accurately calculate the carbon emissions per unit electricity of each section of the transmission line and the load side receiving point, and then calculate the carbon emissions on the load side.

Description

Technical Field

[0001] The present invention relates to a carbon emission accounting method and system, and belongs to the field of carbon rights trading in the electricity market. Background Art

[0002] The Shanghai Environment and Energy Exchange officially opened for trading in July 2021. Since then, my country has had the world's largest carbon rights trading market. However, carbon rights trading is currently concentrated on the power generation side for accounting, and the environmental costs brought by carbon emissions are evenly shared by the market entities on the load side. The existing accounting methods are mainly based on active power. Compared with "whoever emits, whoever is responsible" and "whoever uses, whoever is responsible", it is necessary to clearly distinguish the carbon emission costs of users who purchase high-energy-consuming thermal power, and guide the market to determine the low-carbon transformation of the power generation side; if carbon emissions are calculated from the load side, it is necessary to go through power generation grid connection, power trading, grid topology verification and receiving end point determination. There is currently no suitable load-side carbon emission accounting method. Summary of the Invention

[0003] Purpose of the invention: The purpose of the present invention is to provide a method for accurately calculating carbon emissions based on load-side electricity consumption. The second purpose of the present invention is to provide a carbon emissions accounting system. The third purpose of the present invention is to provide a storage medium for executing the steps of the carbon emissions accounting method for load-side electricity consumption.

[0004] Technical solution: The method for calculating carbon emissions from load-side electricity consumption described in the present invention includes the following steps:

[0005] (1) Determine the line collection point and load-side receiving point of the transmission and distribution architecture;

[0006] (2) Calculate the unit electricity carbon emissions φ′ of the transmission line based on the proportion of primary energy electricity at each line collection point and power generation grid connection point on the transmission line;

[0007] (3) Starting from the electricity consumption side, the carbon emissions of each transmission line are calculated based on the transmission capacity on the transmission line. The carbon emissions of the primary energy electricity on the load side are calculated based on the unit electricity carbon emissions of the transmission line connected to the load side receiving point and the actual electricity consumption on the load side.

[0008] Furthermore, the unit electricity carbon emissions φ′ of the transmission line in step (2) is the sum of two ratios: the ratio of the newly connected electricity generated by primary energy on the transmission line to the newly connected electricity, and the ratio of the carbon emissions of all generators from the power generation side to the transmission line to the transmission electricity. The formula for calculating the unit electricity carbon emissions of the transmission line in section b+1 is:

[0009]

[0010] Where b is the number of transmission line sections from the power generation side to the transmission line, n is the number of generator sets on the transmission line from the power generation side to the bth section, φ k,i is the carbon emission per unit of electricity of the i-th generator set on the k-th transmission line, Q k,i is the power transmission capacity of the i-th unit in the k-th transmission line, Q x,k+1 is the new grid-connected power on the k+1 transmission line, Q y,k+1 It is the newly connected power generation of primary energy on the k+1 transmission line.

[0011] Furthermore, the primary energy electricity proportion of the line collection point in step (2) is the ratio of the primary energy carbon emissions of each line flowing into the line collection point to the power generation.

[0012] Furthermore, the primary energy power proportion of the power generation grid-connected point in step (2) is the ratio of the grid-connected power of the primary energy generator set on the power generation side to the grid-connected power of all grid-connected units.

[0013] Furthermore, the actual power consumption on the load side in step (3) is the load side power consumption data released by the power consumption information collection system, or is calculated based on the line voltage, current and power supply time.

[0014] Furthermore, the method for selecting the line collection point in step (1) is as follows: when there is a power plant connected to the grid, the line collection point is any position of the transmission line between the two power generation grid connection points; when the node is a receiving end point, the line collection point is any position of the transmission line between the load side substation and the nearest power generation grid connection point; when there is a topology change in the transmission line, the line collection point is any position between the current input point of the transmission line and the transmission line with the changed topology.

[0015] The carbon emission accounting system for load-side electricity consumption of the present invention includes:

[0016] Line collection point calculation module, used to calculate the proportion of primary energy electricity at the line collection point on the transmission line;

[0017] The power generation and grid connection point calculation module is used to calculate the primary energy consumption ratio of power generation and grid connection points on the transmission line;

[0018] The transmission line accounting module is used to calculate the carbon emissions per unit of electricity on each section of the transmission line;

[0019] The load-side carbon emissions accounting module is used to calculate the carbon emissions on the load side. The load-side carbon emissions are the product of the load-side carbon emissions per unit electricity and the actual electricity consumption on the load side. The load-side carbon emissions per unit electricity are the carbon emissions per unit electricity of the transmission line connected to the load side.

[0020] Furthermore, the transmission line accounting module calculates the carbon emissions per unit electricity of the transmission line based on the carbon emissions per unit electricity and the electricity of each section of the transmission line from the power generation side to the transmission line.

[0021] Beneficial effects: Compared with the prior art, the advantages of the present invention are: (1) the carbon emissions of electricity consumption by power users on the load side are calculated, and the method of continuously advancing from the power generation side to the load side is adopted afterwards. The proportion of primary energy and electricity consumption on the load side are determined by the power consumption of power users, power generation and grid connection conditions, and finally the carbon emissions on the power generation side are calculated; (2) the carbon emissions per unit electricity of the transmission line are corrected in case there are multiple collection points or power generation and grid connection points in the transmission line, and the carbon emissions per unit electricity of each section of the transmission line are obtained. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 Schematic diagram of the line collection point and receiving terminal drop point in the power transmission and distribution rack of the present invention;

[0023] Figure 2 This is a flow chart of the carbon emissions calculation method of the present invention. DETAILED DESCRIPTION

[0024] The technical solution of the present invention will be further described below with reference to the accompanying drawings.

[0025] like Figure 1 and Figure 2 As shown, the method for calculating carbon emissions from load-side electricity consumption according to the present invention includes the following steps:

[0026] (1) Determine the line convergence point and receiving end point

[0027] (11) Line convergence point selection

[0028] The line collection point is the section of the transmission line where the grid flow changes due to changes in the transmission line topology or the connection of power plants to the grid. 1) In the case of power generation and grid connection, the line collection point is selected anywhere between the transmission line section between the grid connection point where the power plant grid connection node is located and the grid connection point of the next power plant; 2) In the case of load drop points, the line collection point can be selected from any transmission line access point between the nearest power plant grid connection point and the load-side step-down substation; 3) In the case of bifurcation or topology change of the transmission line, the line collection point is anywhere between the carbon right current input node of the transmission line and the transmission line where the transmission line bifurcates or the topology changes.

[0029] (12) Selection of receiving end landing point

[0030] The receiving end point is the starting point of the low-voltage transmission line below the load-side transformer at the transmission end of the transmission line. Generally, the 33 kV or 10 kV distribution side substation or substation is the receiving end point.

[0031] (2) Calculate the proportion of primary energy at the line collection point

[0032] The calculation method of the primary energy electricity proportion at the transmission grid line collection point is shown in formula (1):

[0033]

[0034] Among them, φ l Q is the proportion of primary energy generation of the lth line among the m lines flowing into the collection point x, which can be obtained through actual measurement or calculated according to industry standards; l It is the primary energy generation of the lth line among the m lines flowing into the collection point x, in MWh.

[0035] (3) Calculate the proportion of primary energy electricity at the power generation and grid connection point

[0036] The calculation method of the primary energy proportion of the generator set grid connection point is shown in formula (2):

[0037]

[0038] Among them, Q j is the grid-connected power of the jth primary energy generator set on the power generation side, a is the number of primary energy generator sets, Q i is the amount of electricity generated by the i-th unit on the power generation side, and c is the number of all grid-connected units.

[0039] (4) Correction of carbon emissions per unit of electricity for transmission lines

[0040] On the power generation side, power is connected to the grid. The basic grid-connected metering equipment records the actual grid-connected power of each power plant. The interface of the carbon rights accounting system calls the existing power generation side model table deployed in the branch, province, and local dispatch to obtain the attributes of the corresponding power plant, including thermal power plant, gas power plant, hydropower plant, photovoltaic power plant, wind farm, nuclear power plant, biomass power plant, etc. The primary energy power generation and grid-connected power of each power plant with each attribute is counted and converted into the carbon emissions per unit power of the grid-connected transmission line.

[0041] In the case where there are multiple collection points or power generation grid connection points on the transmission line, formula (3) is used to correct the carbon emissions per unit electricity of the transmission line:

[0042]

[0043] Where b is the number of transmission line sections from the power generation side to the transmission line, n is the number of generator sets on the transmission line from the power generation side to the bth section, φ k,i is the carbon emission per unit of electricity of the i-th generator set on the k-th transmission line, Q k,i is the power transmission capacity of the i-th unit in the k-th transmission line, Q x,k+1 is the new grid-connected power on the k+1 transmission line, Q y,k+1 It is the newly connected power generation of primary energy on the k+1 transmission line.

[0044] When the transmission line is connected to only one collection point or power generation grid connection point, Equation (3) can be simplified to φ′ b+1 =φ, that is, the carbon emissions per unit of electricity of the transmission line and the corresponding connected single node are equal.

[0045] (5) Calculate carbon emissions on the load side

[0046] First, determine the point of the transmission line to which the load-side power user belongs. Assuming that the load-side receiving point is connected to the b+1 section of the transmission line, the carbon emissions per unit of electricity on the load side are equal to the carbon emissions per unit of electricity on the b+1 section of the transmission line. Starting from the power generation side, use formulas (1) to (3) to calculate the carbon emissions per unit of electricity from the 1st section to the b+1th section of the transmission line. The carbon emissions of electricity consumption on the load side are shown in formula (4):

[0047] W f =φ′ b+1 Q f (4)

[0048] Among them, W f Q is the carbon emission of primary energy actually consumed by users on the load side, f The electricity consumption information system of the provincial dispatching department collects and aggregates the meter data on the user side, collects and amends it, and then publishes the electricity consumption to the outside world. The carbon electricity accounting system obtains the published data of the electricity consumption information system through the interface as the actual electricity consumption on the load side, and can also be used according to the formula Calculate the actual power consumption on the load side.

[0049] The carbon emission accounting system for load-side electricity consumption of the present invention includes a line collection point calculation module, a power generation grid connection point calculation module, a transmission line calculation module and a load-side carbon emission accounting module.

[0050] The line collection point calculation module is used to calculate the proportion of primary energy electricity at the line collection point on the transmission line, and the calculation is performed based on the primary energy power generation proportion and power generation of all transmission lines flowing into the collection point.

[0051] The power generation grid connection point calculation module is used to calculate the proportion of primary energy electricity at the power generation grid connection point on the transmission line, and the calculation is performed based on the grid connection electricity of the primary energy generator set at the grid connection point and the grid connection electricity of all generator sets.

[0052] The transmission line accounting module is used to calculate the carbon emissions per unit of electricity on each section of the transmission line. The carbon emissions per unit of electricity of this transmission line are calculated based on the carbon emissions per unit of electricity and the electricity of each section of the transmission line from the power generation side to this transmission line.

[0053] The load-side carbon emissions accounting module is used to calculate the carbon emissions on the load side. The load-side carbon emissions are the product of the load-side carbon emissions per unit electricity and the actual electricity consumption on the load side. The load-side carbon emissions per unit electricity are the carbon emissions per unit electricity of the transmission line connected to the load side.

Claims

1. A method for calculating carbon emissions from load-side electricity consumption, characterized in that: The steps include: (1) Determine the line collection point and load-side receiving point of the transmission and distribution architecture; (2) Calculate the unit electricity carbon emissions φ′ of the transmission line based on the proportion of primary energy electricity at each line collection point and power generation grid connection point on the transmission line; (3) Starting from the electricity consumption side, the carbon emissions of each transmission line are calculated based on the amount of electricity transmitted on the transmission line. The carbon emissions of the primary energy electricity on the load side are calculated based on the unit electricity carbon emissions of the transmission line connected to the load side receiving point and the actual electricity consumption on the load side; The unit electricity carbon emission φ′ of the transmission line in step (2) is the sum of two ratios: the ratio of the newly connected electricity generated by primary energy on the transmission line to the newly connected electricity, and the ratio of the carbon emissions of all generators from the power generation side to the transmission line to the transmission electricity; The formula for calculating the carbon emissions per unit of electricity of the transmission line mentioned in paragraph b+1 is: Where b is the number of transmission line sections from the power generation side to the transmission line, n is the number of generator sets on the transmission line from the power generation side to the bth section, φ k,i is the carbon emission per unit of electricity of the i-th generator set on the k-th transmission line, Q k,i is the power transmission capacity of the i-th unit in the k-th transmission line, Q x,k+1 is the new grid-connected power on the k+1 transmission line, Q y,k+1 It is the newly connected power generation of primary energy on the k+1 transmission line.

2. The method for calculating carbon emissions from load-side electricity consumption according to claim 1, characterized in that: The primary energy electricity proportion of the line collection point in step (2) is the ratio of the primary energy carbon emissions of each line flowing into the line collection point to the power generation.

3. The method for calculating carbon emissions from load-side electricity consumption according to claim 1, characterized in that: The proportion of primary energy electricity at the power generation grid-connected point in step (2) is the ratio of the grid-connected electricity of the primary energy generator set on the power generation side to the grid-connected electricity of all grid-connected units.

4. The method for calculating carbon emissions from load-side electricity consumption according to claim 1, characterized in that: The actual power consumption on the load side in step (3) is the load side power consumption data released by the power consumption information collection system, or is calculated based on the line voltage, current and power supply time.

5. The method for calculating carbon emissions from load-side electricity consumption according to claim 1, characterized in that: The method for selecting the line collection point in step (1) is as follows: when there is a power plant connected to the grid, the line collection point is any position of the transmission line between the two power generation grid connection points; when the node is a receiving end point, the line collection point is any position of the transmission line between the load side substation and the nearest power generation grid connection point; when there is a topology change in the transmission line, the line collection point is any position between the current input point of the transmission line and the transmission line with the changed topology.

6. A carbon emission accounting system for load-side electricity consumption based on the method of claim 1, characterized in that: include: Line collection point calculation module, used to calculate the proportion of primary energy electricity at the line collection point on the transmission line; The power generation and grid connection point calculation module is used to calculate the primary energy consumption ratio of power generation and grid connection points on the transmission line; The transmission line accounting module is used to calculate the carbon emissions per unit of electricity on each section of the transmission line; A load-side carbon emissions accounting module is used to calculate the carbon emissions on the load side, where the carbon emissions on the load side are the product of the carbon emissions per unit of electricity on the load side and the actual electricity consumption on the load side. The carbon emissions per unit of electricity on the load side are the carbon emissions per unit of electricity of the transmission line connected to the load side; The transmission line accounting module calculates the unit electricity carbon emissions of the transmission line based on the unit electricity carbon emissions and electricity of each section of the transmission line from the power generation side to the transmission line.

7. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method for calculating carbon emissions of load-side electricity consumption as described in any one of claims 1 to 5 are implemented.

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