Power system carbon footprint accounting method and device

Abstract

The invention provides a power system carbon footprint accounting method and device. The method comprises the following steps: firstly, acquiring power information of each node; then, according to the power information, determining an association relationship between each node except the power supply node and the power supply node; wherein the association relationship represents the electric energy flowing into / out of the node by each power supply node; calculating node loss of all nodes according to the power information and node types; and finally, determining the carbon emission factor of each node according to the incidence relation and the node loss. According to the method, the power change of each node of the source network load storage is analyzed, the loss of each node is calculated, the type of the consumed energy is tracked by using the association relationship, the carbon emission is further refined to each node, and the tracking of the carbon footprint is completed.

Description

Technical Field

[0001] The present invention belongs to the technical field of carbon footprint accounting, and particularly relates to a method and device for carbon footprint accounting of a power system. Background Art

[0002] To meet the demand of the power system for carbon emission reduction, the key lies in accurately processing and analyzing carbon footprint data, that is, scientifically calculating the various factors affecting the carbon footprint and their degrees to obtain accurate and reliable data. Although there are already various carbon emission measurement methods and standards, the carbon footprint accounting in the power generation, transmission, and power consumption links of the power system is still in its initial stage.

[0003] Currently, its calculation method mainly relies on macroscopic carbon emission statistical data. Based on the total fuel consumption of power generation in a specific region over a certain period, the total carbon emissions of the region are estimated by referring to statistical or standard data. The carbon emissions on the power consumption side of the power grid are estimated by multiplying the average carbon emission factor by the power consumption, and then the emissions on the power generation side and the power consumption side are combined to obtain the total carbon emissions of the system.

[0004] However, the existing technology has defects. It does not fully consider the regional and temporal differences of carbon emission factors, resulting in large regional calculation errors, and it is unable to account for the composition of carbon emissions on the power generation side, which restricts the formulation of carbon emission reduction optimization strategies on the power generation side. At the same time, in the actual operation of the power system, the carbon emission factors of nodes change dynamically due to changes in the types, quantities, and equipment states of the connected nodes, and these factors have not been fully considered by the existing technology and need to be further improved and perfected. Summary of the Invention

[0005] In view of this, the present invention provides a method and device for carbon footprint accounting of a power system, aiming to solve the problem that the existing technology does not consider the dynamic changes of the power system and the carbon footprint accounting is inaccurate.

[0006] The first aspect of the embodiment of the present invention provides a method for carbon footprint accounting of a power system. The types of each node in the power system include power source nodes, transmission nodes, load nodes, and energy storage nodes. The method includes:

[0007] Obtain the power information of each node;

[0008] According to the power information, determine the association relationship between each node except the power source node and the power source node; wherein, the association relationship represents the electric energy flowing into / out of the node by each power source node;

[0009] Calculate the node losses of all nodes according to the power information and the node types;

[0010] Determine the carbon emission factor of each node according to the association relationship and the node losses.

[0011] In a possible implementation manner, based on the power information, determine the association relationships between each node except the power supply node and the power supply node, including:

[0012] Based on the power information, perform power flow calculation to obtain the power flow calculation result;

[0013] Construct an association matrix based on the topological structure of the power network and the power flow calculation result; wherein, each element in the association matrix is used to represent the association relationship between each node and the power supply node.

[0014] In a possible implementation manner, construct an association matrix based on the topological structure of the power network and the power flow calculation result, including:

[0015] Based on the topological structure of the power network, construct an initial association matrix between each node and the power supply node;

[0016] According to the power flow calculation result, fill the initial association matrix to obtain the association matrix.

[0017] In a possible implementation manner, based on the power information and the node type, calculate the node losses of all nodes, including:

[0018] According to the node type, determine the energy injection ratio and energy output ratio of each node;

[0019] According to the energy injection ratio, energy output ratio, injection power, output power and node type of each node, calculate the node losses of each node.

[0020] In a possible implementation manner, for the power supply node; according to the energy injection ratio, energy output ratio, injection power, output power and node type of each node, calculate the node losses of each node, including:

[0021] Multiply the injection power by the energy injection ratio, subtract the product of the output power and the energy output ratio, and add the power generation loss to obtain the node loss of the power supply node.

[0022] In a possible implementation manner, for the transmission node / load node; according to the energy injection ratio, energy output ratio, injection power, output power and node type of each node, calculate the node losses of each node, including:

[0023] Multiply the injection power by the energy injection ratio, subtract the product of the output power and the energy output ratio, to obtain the node loss of the transmission node / load node.

[0024] In a possible implementation manner, for the energy storage node; according to the energy injection ratio, energy output ratio, injection power, output power and node type of each node, calculate the node losses of each node, including:

[0025] Subtract the product of the output power and the energy output ratio from the product of the injection power and the energy injection ratio in sequence, subtract the energy storage increment, and add the energy storage loss to obtain the node loss of the power supply node.

[0026] In a possible implementation, according to the association relationship and the node loss, determine the carbon emission factors of each node, including:

[0027] According to the node loss and the association relationship, determine the energy loss of each energy for each node;

[0028] Calculate the total carbon emissions of each energy;

[0029] According to the energy loss of each energy and the total carbon emissions of each energy, determine the carbon emission value of each node.

[0030] In a possible implementation, according to the energy loss of each energy and the total carbon emissions of each energy, determine the carbon emission value of each node, including:

[0031] For any node, multiply the ratio of the energy loss of each energy of the node to the total energy by the total carbon emissions of each energy to obtain the carbon emission value of each node.

[0032] The second aspect of the embodiments of the present invention provides a power system carbon footprint accounting device. The types of each node in the power system include power supply nodes, transmission nodes, load nodes, and energy storage nodes; the device includes:

[0033] An acquisition module, configured to acquire the power information of each node;

[0034] An association module, configured to determine the association relationship between each node except the power supply node and the power supply node according to the power information; wherein, the association relationship represents the electric energy flowing into / out of the node by each power supply node;

[0035] A calculation module, configured to calculate the node loss of all nodes according to the power information and the node type;

[0036] A determination module, configured to determine the carbon emission factors of each node according to the association relationship and the node loss.

[0037] The power system carbon footprint accounting method and device provided by the embodiments of the present invention first obtain the power information of each node; then, according to the power information, determine the association relationship between each node except the power source node and the power source node; wherein, the association relationship represents the electric energy flowing into / out of this node from each power source node; then, calculate the node losses of all nodes according to the power information and the node type; finally, determine the carbon emission factors of each node according to the association relationship and the node losses. By analyzing the power changes of each node in the source-grid-load-storage system, the present invention calculates the node losses of each node and uses the association relationship to trace the type of energy lost, further refining the carbon emissions to each node and completing the tracking of the carbon footprint. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0039] Figure 1 is the implementation flowchart of the power system carbon footprint accounting method provided by the embodiments of the present invention;

[0040] Figure 2 is the structural schematic diagram of the power system carbon footprint accounting device provided by the embodiments of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0041] In the following description, specific details such as specific system structures and technologies are presented for the purpose of illustration rather than limitation, so as to thoroughly understand the embodiments of the present invention. However, those skilled in the art should clearly understand that the present invention can also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to avoid unnecessary details from interfering with the description of the present invention.

[0042] Figure 1 is the implementation flowchart of the power system carbon footprint accounting method provided by the embodiments of the present invention. As Figure 1 shown, for the power system carbon footprint accounting method, the types of each node in the power system include power source nodes, transmission nodes, load nodes, and energy storage nodes; the method includes:

[0043] S110, obtain the power information of each node;

[0044] S120, according to the power information, determine the association relationship between each node except the power source node and the power source node; wherein, the association relationship represents the electric energy flowing into / out of this node from each power source node;

[0045] S130. Calculate the node losses of all nodes according to the power information and node types.

[0046] S140. Determine the carbon emission factors of each node according to the association relationship and node losses.

[0047] For different types of power source nodes, the methods of obtaining power information are different. In thermal power plants, power monitoring devices such as power transmitters are usually installed. These devices can measure the output power of generators in real time. By measuring and calculating parameters such as the rotational speed, voltage, and current of the generators, and according to relevant electrical formulas, the output power of a thermal power plant at a certain moment can be accurately obtained. For hydropower plants, in addition to measuring parameters such as the voltage and current of the generators, factors such as the flow rate of the water turbine and the water head (the water level difference between upstream and downstream) need to be combined to calculate the power. Because the power of hydropower generation is closely related to the water flow rate and the water head height. Wind farms monitor parameters such as wind speed and blade rotational speed through devices such as anemometers and power sensors installed on wind turbines, and then calculate the power according to specific wind power generation formulas. Solar power plants obtain power information by measuring parameters such as light intensity, cell temperature, open-circuit voltage, and short-circuit current according to the types of solar cells used (such as crystalline silicon solar cells, thin-film solar cells, etc.), and using corresponding solar power generation power calculation formulas.

[0048] At transmission nodes, power information is mainly obtained through various monitoring devices installed on substations and transmission lines. In substations, voltage transformers and current transformers are commonly used monitoring devices. They can measure the voltage and current of the incoming and outgoing lines of the substation respectively, and then calculate the power of the incoming and outgoing lines. For transmission lines, in addition to obtaining partial power information at the substations at both ends, new monitoring devices such as distributed optical fiber sensors and wireless sensors can also be installed on the lines. These sensors can monitor the changes in parameters such as current and voltage on the transmission lines in real time, and then calculate the power conditions at different positions on the transmission lines. By accurately obtaining the power information of transmission nodes, the power loss situation and transmission efficiency during the power transmission process can be understood in a timely manner.

[0049] For load nodes, the main ways to obtain power information are through the electricity meters installed at the user end and the power monitoring devices at the load center. Ordinary electricity meters used by residential users can measure parameters such as voltage and current of household electricity. In large load centers such as industrial enterprises, more professional power monitoring devices are usually installed, such as smart meters, power analyzers, etc. These devices can not only measure voltage and current, but also analyze the power consumption of different electrical devices. For example, they can distinguish the specific power consumption of a certain machine tool in production equipment at a certain moment. By obtaining the power information of load nodes, the electricity demand patterns of different user groups and the power changes during peak and off-peak periods can be understood, thus providing a basis for the dispatching and supply of the power system.

[0050] For energy storage nodes, the methods to obtain power information depend on the type of energy storage device. For battery energy storage systems, a battery management system is usually installed, which can monitor parameters such as the voltage, current, and temperature of the battery. Combining with the charge and discharge state of the battery, the charge and discharge power of the battery energy storage system at a certain moment can be calculated. For pumped-storage power stations, by monitoring parameters such as the flow rate, head, and rotational speed of the water turbine, the power under different states can be calculated according to the relevant formulas of pumped-storage power generation. By obtaining the power information of energy storage nodes, the charge and discharge conditions of energy storage devices and their role in regulating the balance of power supply and demand in the power system can be understood.

[0051] In some embodiments, according to the power information, the association relationships between each node except the power source node and the power source node are determined, including: performing a power flow calculation based on the power information to obtain the power flow calculation result; constructing an association matrix based on the topological structure of the power network and the power flow calculation result; where each element in the association matrix is used to represent the association relationship between each node and the power source node.

[0052] In the embodiments of the present invention, power flow calculation is an important means to determine the voltage and current distribution of each node in the power system. It is solved based on the node power equation. By solving these equations, the accurate voltage and current distribution of each node can be obtained, thus laying a foundation for further analyzing power distribution and sources.

[0053] In some embodiments, constructing an association matrix based on the topological structure of the power network and the power flow calculation result includes: constructing an initial association matrix between each node and the power source node based on the topological structure of the power network; filling the initial association matrix according to the power flow calculation result to obtain the association matrix.

[0054] In the embodiments of the present invention, first, an initial incidence matrix A of nodes and branches is established according to the network connection situation of the power system, and its elements are defined as aij: if the branch is connected to the node and the current direction is away from the node, then aij = 1; if the branch is connected to the node and the current direction is into the node, then aij = -1; if the branch is not connected to the node, then aij = 0.

[0055] After power flow calculation, the branch power flow vector (including the active power of each branch) and the node injection power vector (including the injected active power of each node) are obtained. According to the power balance equation, the relationship between the branch power flow and the node injection power can be solved.

[0056] For a given node, assume that its power source needs to be traced. First, find all the branches connected to the node, and let these branches form a set.

[0057] For each branch, according to the incidence matrix and the power flow calculation results, determine the power flow direction of the branch. If the power of the branch is flowing into the node, then continue to trace the starting node of the branch (determined by the elements of the incidence matrix).

[0058] At the starting node, repeat the above steps until the power source node is traced. In this way, a path can be constructed from the node back to the power source, and the proportion of the power contribution of each power source to the node can be calculated. For example, if a thermal power source is traced along a certain path and the power losses of each branch on the path can be accurately calculated, then the power contribution share of the thermal power source to the node can be determined.

[0059] Multiply each element of the initial incidence matrix by the contribution share of each power source on the corresponding node, and the incidence matrix can be obtained.

[0060] In some embodiments, according to the power information and node types, the node losses of all nodes are calculated, including: determining the energy injection ratio and energy output ratio of each node according to the node type; calculating the node losses of each node according to the energy injection ratio, energy output ratio, injection power, output power and node type of each node.

[0061] In the embodiments of the present invention, for a power source node, the ratio of its power generation to the electricity input to the node from the external line is the energy injection ratio, which is also the energy output ratio. Similarly, the energy injection ratio and energy output ratio of the transmission node and the load node are also the same. However, for a storage node, the ratio of the contribution share of each power source input to the node is the energy injection ratio, but the energy output ratio is the proportion of the stored energy. For some special nodes, such as electric vehicles, which are both load nodes and can be connected to the grid as storage nodes, when their node properties change, the corresponding energy injection ratio and energy output ratio also need to be adjusted accordingly.

[0062] In some embodiments, for a power supply node, the node loss of each node is calculated according to the energy injection ratio, energy output ratio, injection power, output power, and node type of each node, including: multiplying the injection power by the energy injection ratio, subtracting the product of the output power and the energy output ratio, and adding the power generation loss to obtain the node loss of the power supply node.

[0063] In some embodiments, for a transmission node / load node, the node loss of each node is calculated according to the energy injection ratio, energy output ratio, injection power, output power, and node type of each node, including: multiplying the injection power by the energy injection ratio, subtracting the product of the output power and the energy output ratio to obtain the node loss of the transmission node / load node.

[0064] In some embodiments, for an energy storage node, the node loss of each node is calculated according to the energy injection ratio, energy output ratio, injection power, output power, and node type of each node, including: multiplying the injection power by the energy injection ratio, successively subtracting the product of the output power and the energy output ratio and the energy storage increment, and adding the energy storage loss to obtain the node loss of the power supply node.

[0065] In the embodiments of the present invention, the power generation loss is an inevitable loss during the conversion of other forms of energy (such as the chemical energy of fossil fuels, water energy, wind energy, etc.) into electrical energy by the power supply node. For example, in thermal power generation, a part of the heat energy generated by coal combustion will be dissipated through chimneys, cooling systems, etc., and this part of the dissipated energy is part of the power generation loss. For different power generation methods, the sources and magnitudes of the power generation loss are different. For example, the power generation loss of solar photovoltaic power generation mainly includes the conversion efficiency loss of photovoltaic cells, the temperature loss of solar panels, etc.; the power generation loss of hydropower mainly includes the mechanical loss of water turbines, the electromagnetic loss of generators, etc. Transmission nodes are mainly responsible for the transmission of energy (taking electrical energy as an example), such as substations, transmission lines, etc.; load nodes are the consumption terminals of energy, such as electrical equipment in factories, households, etc. Their node loss refers to the energy loss caused by factors such as line resistance and equipment loss during the energy transmission and use process. The energy storage loss refers to the energy loss generated during the storage and release of energy in an energy storage system (such as battery energy storage, pumped-storage energy storage, etc.). The energy storage system plays a role in balancing energy supply and demand and improving energy utilization efficiency in the energy system, but there will inevitably be losses during the energy storage and energy release processes.

[0066] In some embodiments, according to the association relationship and the node loss, the carbon emission factor of each node is determined, including: determining the energy loss amount of each energy of each node according to the node loss and the association relationship; calculating the total carbon emission of each energy; determining the carbon emission value of each node according to the energy loss amount of each energy and the total carbon emission of each energy.

[0067] In some embodiments, the carbon emission value of each node is determined according to the loss amount of each energy source and the total carbon emission amount of each energy source, including: for any node, multiplying the ratio of the loss amount of each energy source of the node to the total energy amount by the total carbon emission amount of each energy source to obtain the carbon emission value of each node.

[0068] In the above embodiments, first, the association relationship between each node and the power source node is determined through power flow calculation and construction of an association matrix based on power information. Through the process of constructing the association matrix, the connection situation between each branch and the node and the current direction can be clarified (for example, if a branch is connected to a node and the current direction is away from the node, the corresponding matrix element is 1; if it enters the node, it is -1; if not connected, it is 0), and through power flow calculation, the branch power flow vector and the node injection power vector are obtained. Then, based on the power balance equation, the relationship between the branch power flow and the node injection power is solved.

[0069] When tracing the power source of a given node, first find the set of all branches connected to the node, and then determine the power flow direction of each branch according to the association matrix and the power flow calculation result. If the branch power flows into the node, continue to trace the starting node of the branch (determined by the association matrix element), and repeat this process until the power source node is traced, thereby constructing a path from the node back to the power source.

[0070] Once the association path between each node and the power source node is clarified, the loss amount of each energy source of each node can be determined in combination with the node loss. Because different power source nodes (such as power sources of different energy forms like thermal power, hydropower, and wind power) will have different degrees of energy loss due to node loss during the process of transmitting power to each node.

[0071] For example, assume that a certain node finds that its power sources are a thermal power source and a hydropower source through the above tracing path. During the tracing process, given the power loss situation of each branch, then according to this information and the relevant data of node loss (such as the node loss calculation methods of different types of nodes mentioned above, including the node loss calculations of power source nodes, transmission nodes / load nodes, and energy storage nodes), the specific loss amounts of thermal power energy and hydropower energy at this node can be determined respectively. For example, when the thermal power energy is transmitted to this node through a series of nodes and branches, the energy loss caused by node loss is a certain value, which is the partial loss amount of this node for thermal power energy; similarly, the loss amount of this node for hydropower energy can be determined, etc., so as to determine the loss amounts of each node for different energy sources.

[0072] For different types of energy, their carbon emissions are different, and it is necessary to calculate the total carbon emissions of each energy source based on corresponding standards, data, or models. For example, for thermal power energy, the total carbon emissions are usually calculated based on factors such as the type of fuel burned (such as coal, natural gas, etc.) and the combustion efficiency, in combination with the existing carbon emission coefficients (carbon emissions per unit of energy). Generally speaking, the carbon emission coefficient of coal combustion is relatively high, while that of natural gas combustion is relatively low.

[0073] For hydropower energy, its carbon emissions during the power generation process itself are relatively small, but certain carbon emissions may be generated during the entire hydropower project construction, equipment operation and maintenance, etc. It is necessary to comprehensively consider these factors and determine its total carbon emissions based on relevant research or industry specifications.

[0074] For renewable energy such as wind power and solar energy, their direct carbon emissions during the energy generation process can be almost ignored, but certain carbon emissions will be generated during the manufacturing of equipment such as wind turbines and solar panels, as well as the construction of related infrastructure. Similarly, it is necessary to determine its total carbon emissions based on relevant information.

[0075] Taking thermal power energy as an example, if the total power generation of thermal power sources in a certain power system is known to be a certain value, and combined with the carbon emission coefficient of thermal power, the total carbon emissions of thermal power energy can be calculated. Assuming that the carbon emission coefficient of thermal power energy is a certain amount of carbon dioxide emissions per kilowatt-hour of electricity generated, then by counting the total power generation of thermal power sources (unit: kilowatt-hour) and multiplying the two, the total carbon emissions of thermal power energy can be obtained.

[0076] For hydropower energy, assuming that after comprehensively considering various factors, the carbon emission coefficient corresponding to each unit of hydropower generation is determined (this coefficient may be an equivalent coefficient that comprehensively considers aspects such as project construction and equipment operation), and then based on the total power generation of hydropower sources, the total carbon emissions of hydropower energy are also calculated by multiplication.

[0077] Similarly, for other energy sources such as wind power and solar energy, they also calculate their respective total carbon emissions according to their respective determined carbon emission calculation methods, based on their total power generation or other relevant energy indicators and the corresponding carbon emission coefficients.

[0078] For any node, it is first necessary to calculate the ratio of the energy loss of each type of energy at this node to the total energy. The total energy here can be understood as the sum of all the energy received by this node (including various types of energy from different power source nodes). Suppose a node receives various types of energy such as thermal power, hydropower, and wind power. Its thermal power energy loss is Q1, its hydropower energy loss is Q2, its wind power energy loss is Q3, …, and the total energy is Qt (Qt = Q1 + Q2 + Q3 + …). Then the ratio of the thermal power energy loss of this node to the total energy is Q1 / Qt, the ratio of the hydropower energy loss to the total energy is Q2 / Qt, the ratio of the wind power energy loss to the total energy is Q3 / Qt, …

[0079] By multiplying the ratio of the energy loss of each type of energy to the total energy obtained from the above calculation by the total carbon emissions of each type of energy, the carbon emission value of each node can be obtained. Continuing with the above example, suppose the total carbon emissions of thermal power energy is C1, the total carbon emissions of hydropower energy is C2, the total carbon emissions of wind power energy is C3, … Then the carbon emission value Cv of this node can be calculated by the following formula:

[0080] Cv = (Q1 / Qt + Q2 / Qt + Q3 / Qt + …) × (C1 + C2 + C3 + …)

[0081] It should be understood that the magnitudes of the sequence numbers of the steps in the above embodiments do not mean the order of execution. The order of execution of each process should be determined by its function and internal logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.

[0082] Figure 2 is a schematic structural diagram of a power system carbon footprint accounting device provided by an embodiment of the present invention. As Figure 2 shown, for the power system carbon footprint accounting device, the types of each node in the power system include power source nodes, transmission nodes, load nodes, and energy storage nodes; the device includes:

[0083] An acquisition module 210, configured to acquire the power information of each node;

[0084] An association module 220, configured to determine the association relationship between each node other than the power source node and the power source node according to the power information; wherein, the association relationship represents the electric energy flowing into / out of this node from each power source node;

[0085] A calculation module 230, configured to calculate the node losses of all nodes according to the power information and the node type;

[0086] A determination module 240, configured to determine the carbon emission factor of each node according to the association relationship and the node losses.

[0087] Optionally, the association module 220 is configured to: perform power flow calculation based on the power information to obtain a power flow calculation result; construct an association matrix based on the topological structure of the power network and the power flow calculation result; wherein each element in the association matrix is used to represent the association relationship between each node and the power source node.

[0088] Optionally, the association module 220 is configured to: construct an initial association matrix between each node and the power source node based on the topological structure of the power network; fill the initial association matrix according to the power flow calculation result to obtain the association matrix.

[0089] Optionally, the calculation module 230 is configured to: determine the energy injection ratio and energy output ratio of each node according to the node type; calculate the node loss of each node according to the energy injection ratio, energy output ratio, injection power, output power and node type of each node.

[0090] Optionally, the calculation module 230 is configured to: multiply the injection power by the energy injection ratio, subtract the product of the output power and the energy output ratio, and add the power generation loss to obtain the node loss of the power source node.

[0091] Optionally, the calculation module 230 is configured to: multiply the injection power by the energy injection ratio, subtract the product of the output power and the energy output ratio to obtain the node loss of the transmission node / load node.

[0092] Optionally, the calculation module 230 is configured to: multiply the injection power by the energy injection ratio, successively subtract the product of the output power and the energy output ratio and the energy storage increment, and add the energy storage loss to obtain the node loss of the power source node.

[0093] Optionally, the determination module 240 is configured to: determine the energy loss amount of each energy of each node according to the node loss and the association relationship; calculate the total carbon emission amount of each energy; determine the carbon emission value of each node according to the energy loss amount of each energy and the total carbon emission amount of each energy.

[0094] Optionally, the determination module 240 is configured to: for any node, multiply the ratio of the energy loss amount of each energy of the node to the total energy amount by the total carbon emission amount of each energy to obtain the carbon emission value of each node.

[0095] It should be understood that the magnitudes of the sequence numbers of the steps in the above embodiments do not mean the order of execution. The execution order of each process should be determined according to its function and internal logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.

[0096] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention, and should all be included within the protection scope of the present invention.

Claims

1. A method for calculating carbon footprint of a power system, characterized in that: The types of nodes in the power system include power supply nodes, transmission nodes, load nodes and energy storage nodes; the method includes: Get the power information of each node; Determine, based on the power information, the association relationship between each node except the power node and the power node; wherein the association relationship represents the electric energy flowing into / out of each power node; Calculating node losses of all nodes according to the power information and the node type; The carbon emission factor of each node is determined according to the association relationship and the node loss.

2. The method for calculating carbon footprint of a power system according to claim 1, characterized in that: Determining, according to the power information, an association relationship between each node except the power node and the power node, including: Performing power flow calculation according to the power information to obtain a power flow calculation result; A correlation matrix is ​​constructed based on the topological structure of the power network and the flow calculation results; wherein each element in the correlation matrix is ​​used to represent the correlation relationship between each node and the power supply node.

3. The method for calculating carbon footprint of a power system according to claim 2, characterized in that: The correlation matrix is ​​constructed based on the topological structure of the power network and the flow calculation results, including: Based on the topological structure of the power network, construct an initial association matrix between each node and the power supply node; According to the power flow calculation result, the initial correlation matrix is ​​filled to obtain the correlation matrix.

4. The method for calculating carbon footprint of a power system according to claim 1, characterized in that: Calculating node losses of all nodes according to the power information and the node type, including: Determine the energy injection ratio and energy output ratio of each node according to the node type; The node loss of each node is calculated according to the energy injection ratio, energy output ratio, injection power, output power and the node type of each node.

5. The method for calculating carbon footprint of a power system according to claim 4, characterized in that: For a power node; according to the energy injection ratio, energy output ratio, injection power, output power and node type of each node, the node loss of each node is calculated, including: The node loss of the power supply node is obtained by subtracting the product of the output power and the energy output ratio from the product of the injection power and the energy injection ratio and adding the power generation loss.

6. The method for calculating carbon footprint of a power system according to claim 4, characterized in that: For transmission nodes / load nodes; according to the energy injection ratio, energy output ratio, injection power, output power and node type of each node, the node loss of each node is calculated, including: The node loss of the transmission node / load node is obtained by subtracting the product of the output power and the energy output ratio from the product of the injection power and the energy injection ratio.

7. The method for calculating carbon footprint of a power system according to claim 4, characterized in that: For energy storage nodes, the node loss of each node is calculated according to the energy injection ratio, energy output ratio, injection power, output power and node type of each node, including: The node loss of the power supply node is obtained by subtracting the product of the output power and the energy output ratio and the energy storage increment from the product of the injection power and the energy injection ratio, and adding the energy storage loss.

8. The method for calculating carbon footprint of a power system according to claim 1, characterized in that: Determining the carbon emission factor of each node according to the association relationship and the node loss includes: Determine the energy consumption of each node according to the node loss and the association relationship; Calculate the total carbon emissions of each energy source; The carbon emission value of each node is determined based on the loss of each energy source and the total carbon emission of each energy source.

9. The method for calculating carbon footprint of a power system according to claim 1, characterized in that: According to the loss of each energy source and the total carbon emission of each energy source, the carbon emission value of each node is determined, including: For any node, the ratio of the energy consumption of each energy source to the total energy consumption of the node is multiplied by the total carbon emission of each energy source to obtain the carbon emission value of each node.

10. A power system carbon footprint accounting device, characterized in that: The types of nodes in the power system include power supply nodes, transmission nodes, load nodes and energy storage nodes; the device includes: An acquisition module is used to obtain power information of each node; An association module, used to determine the association relationship between each node except the power node and the power node according to the power information; wherein the association relationship represents the electric energy flowing into / out of each power node; A calculation module, used for calculating the node loss of all nodes according to the power information and the node type; The determination module is used to determine the carbon emission factor of each node according to the association relationship and the node loss.

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