A carbon emission analysis method and system for multi-energy systems and users

Abstract

The present invention relates to the technical field of carbon emission data analysis, and specifically, to a carbon emission analysis method and system for multi-energy systems and users. The method or system provided by the present invention provides a carbon emission analysis framework for multi-energy systems, and divides the carbon emission analysis subjects of multi-energy systems into system operators and users. On this basis, the present invention forms a direct carbon emission analysis method for multi-energy systems based on operating power, forms a carbon emission analysis method for secondary energy coupling such as electricity, heat, and cold in multi-energy systems considering dynamic transmission characteristics, forms a carbon emission analysis method for energy storage devices and system losses, and realizes a refined analysis of carbon emissions from multi-energy systems and users.

Description

Technical Field

[0001] The present invention relates to the technical field of carbon emission data analysis, and in particular to a carbon emission analysis method and system for multi-energy systems and users. Background Art

[0002] A multi-energy system is an energy supply network formed by coupling different types of energy, such as electricity, heat, cooling, and gas. Compared with a single energy system, a multi-energy system can meet users' energy needs in different forms, and can achieve coupling and complementarity between different energy sources. It has strong operational flexibility and carbon emission reduction potential, and has therefore been widely studied and applied. In the context of low-carbon transformation, carbon emissions from multi-energy systems have also received increasing attention. The refined analysis of carbon emissions is the key and prerequisite for grasping the total amount of carbon emissions from multi-energy systems, clarifying the carbon emissions of multi-energy systems, and tapping the carbon emission reduction potential of multi-energy systems.

[0003] At present, the analysis of carbon emissions in multi-energy systems mainly regards the multi-energy system as a whole, calculates its overall carbon emissions in a macroscopic way, calculates direct carbon emissions based on the emission intensity of the device, and calculates indirect carbon emissions from purchased secondary energy based on the average emission factor method. The existing methods have the following main shortcomings: First, the multi-energy system is analyzed as a whole, and the carbon emissions caused by system losses are ignored. However, in fact, the main body of the multi-energy system includes system operators and multi-energy users. The carbon emissions of different subjects should be analyzed separately, and the carbon emissions caused by system losses and the allocation rules should be considered at the same time; second, the direct carbon emissions of the device are calculated by emission intensity, ignoring the changes in the emission intensity of the device under different outputs, resulting in errors in the carbon emission analysis results; third, the indirect carbon emissions of secondary energy are calculated by the average emission factor, ignoring the energy processing, conversion, transmission, storage and use process of the multi-energy system itself, and failing to reflect the transmission characteristics and dynamic characteristics of carbon emissions in secondary energy such as electricity, cold and heat, resulting in deviations in the carbon emission analysis results. Summary of the invention

[0004] The purpose of the present invention is to provide a carbon emission analysis method and system for multi-energy systems and users to solve the above-mentioned problems in the prior art.

[0005] The present invention is achieved through the following technical solutions:

[0006] In a first aspect, the present invention provides a carbon emission analysis method for a multi-energy system and a user, comprising:

[0007] Establishing a multi-energy system, which includes multi-energy transmission, multi-energy conversion and multi-energy use;

[0008] The multi-energy transmission includes:

[0009] Establishing a first indirect carbon emission transmission model for the power grid, obtaining the indirect carbon emission intensity of the power grid through the first indirect carbon emission transmission model, establishing a second indirect carbon emission transmission model for the lines and nodes in the power grid through the indirect carbon emission intensity of the power grid, and obtaining the indirect carbon emission intensity of any node in the power grid;

[0010] Establish a unified third indirect carbon emission transmission model for the hot and cold networks, obtain the carbon emission intensity of the hot and cold networks through the third indirect carbon emission transmission model, establish a fourth indirect carbon emission transmission model for pipelines and nodes in the hot and cold networks through the carbon emission intensity of the hot and cold networks, and obtain the indirect carbon emission intensity of any node in the hot and cold networks;

[0011] A direct carbon emission transmission model of the gas grid is established to obtain the carbon emission intensity of the gas grid.

[0012] Preferably, the multi-energy conversion includes:

[0013] Divide energy conversion categories according to energy forms, and establish a carbon emission conversion model based on the conversion categories;

[0014] A carbon emission model for the energy storage device is established, and the carbon emission intensity of the energy storage device during charging or discharging is output through the carbon emission model of the energy storage device.

[0015] Preferably, the multi-energy system further includes a system operator and a system user, the carbon emissions of the system operator are defined, including energy conversion equipment, energy transmission losses and purchased secondary energy, and the carbon emissions of the system user are defined, including primary energy use and secondary energy use;

[0016] Establish a system operator carbon emission model, and output the indirect carbon emission intensity of purchased secondary energy, the indirect carbon emission intensity of energy transmission loss, and the direct carbon emission intensity of energy conversion equipment through the system operator carbon emission model;

[0017] A system user carbon emission model is established, and the indirect carbon emission intensity of secondary energy use and the direct carbon emission of primary energy use are output through the system user carbon emission model.

[0018] Preferably, the first indirect carbon emission transmission model includes:

[0019]

[0020] In the formula, Power Node Indirect carbon emission intensity of electricity supply, Power Node In the period Direct carbon emissions; For Node In the period total power generation.

[0021] Preferably, the second indirect carbon emission transmission model includes:

[0022]

[0023] In the formula, is the indirect carbon emission intensity of any node in the power grid, is the indirect carbon emission intensity of line 1, is the indirect carbon emission intensity of route 2, For line indirect carbon emission intensity; is the electric power of line 1, is the electric power of line 2, For line The electrical power; A collection of lines to inject into this node; The set of outgoing lines for this node.

[0024] Preferably, the third indirect carbon emission transmission model includes:

[0025]

[0026] In the formula, Cold and hot source nodes Indirect carbon emission intensity of heating supply; Cold and hot source nodes exist Direct carbon emissions from cooling or heating during the time period; Cold and hot source nodes At the moment The cooling or heating power; is the specific heat capacity of the cold medium or the hot medium; For the flow through the cold and hot source nodes Mass flow rate of cooling or heating pipes; Cold and hot source nodes At the moment The water supply temperature; Cold and hot source nodes At the moment The return water temperature.

[0027] Preferably, the fourth indirect carbon emission transmission model includes:

[0028]

[0029] In the formula, is the indirect carbon emission intensity of any node in the cooling and heating network; is the indirect carbon emission intensity of pipeline 1, is the indirect carbon emission intensity of pipeline 2, For pipeline indirect carbon emission intensity; A collection of pipelines to inject into this node; A collection of outgoing pipes for this node; is the cooling power or heating power of pipeline 1, is the cooling power or heating power of pipeline 2, For pipeline The cooling or heating power, For flow through pipe mass flow rate.

[0030] Preferably, the establishing of the carbon emission conversion model comprises:

[0031]

[0032] In the formula, For energy conversion equipment Total indirect carbon emissions from energy output; Enter the total indirect carbon emissions for energy conversion equipment; Output energy for the first energy source of the energy conversion device; Output energy for the second energy source of the energy conversion device; For energy conversion equipment Energy output of energy; For energy conversion equipment Indirect carbon emission intensity of energy output.

[0033] Preferably, establishing a carbon emission model for an energy storage device includes:

[0034]

[0035]

[0036] In the formula, is the carbon emissions of energy storage devices, The carbon emissions from the remaining energy stored; The carbon emission intensity of the energy used for charging; To charge energy; the carbon intensity of storing energy for energy storage; The total energy stored for energy storage, The carbon emission intensity of energy storage and release; The energy release efficiency of energy storage.

[0037] In a second aspect, the present invention provides a carbon emission analysis system for a multi-energy system and a user, comprising:

[0038] The energy conversion module is configured to classify energy conversion categories according to the form of energy, establish a carbon emission conversion model based on the conversion categories; establish a carbon emission model for the energy storage device, and output the carbon emission intensity of the energy storage device during charging or discharging through the carbon emission model of the energy storage device;

[0039] The energy transmission module is configured to establish a first indirect carbon emission transmission model of the power grid, obtain the indirect carbon emission intensity of the power grid through the first indirect carbon emission transmission model, establish a second indirect carbon emission transmission model of the lines and nodes in the power grid through the indirect carbon emission intensity of the power grid, and obtain the indirect carbon emission intensity of any node in the power grid; establish a third indirect carbon emission transmission model that unifies the cold and hot networks, obtain the carbon emission intensity of the cold and hot networks through the third indirect carbon emission transmission model, establish a fourth indirect carbon emission transmission model for pipelines and nodes in the cold and hot networks through the carbon emission intensity of the cold and hot networks, and obtain the indirect carbon emission intensity of any node in the cold and hot networks; establish a direct carbon emission transmission model of the gas network to obtain the carbon emission intensity of the gas network;

[0040] The energy use module is configured to receive the energy transmitted by the energy transmission module and convert it into a load;

[0041] A main control module, which is connected to the energy conversion module, the energy transmission module and the energy use module, and is used to execute the above-mentioned carbon emission analysis method for multi-energy systems and users.

[0042] The technical solution of the embodiment of the present invention has at least the following advantages and beneficial effects:

[0043] By adopting the method or system provided by the present invention, a carbon emission analysis framework for multi-energy systems is provided, and the carbon emission analysis subjects of multi-energy systems are divided into system operators and users. On this basis, the present invention forms a direct carbon emission analysis method for multi-energy systems based on operating power, forms a carbon emission analysis method for the coupling of secondary energy such as electricity, heat, and cold in multi-energy systems considering dynamic transmission characteristics, forms a carbon emission analysis method for energy storage devices and system losses, and realizes a refined analysis of carbon emissions from multi-energy systems and users.

[0044] The analysis of carbon emissions from multi-energy systems mainly considers the multi-energy system as a whole and calculates its overall carbon emissions from a macro perspective. This paper refines the analysis framework of carbon emissions from multi-energy systems and constructs a more refined carbon emissions analysis model. A direct carbon emissions analysis method for multi-energy systems based on operating power is proposed, which can analyze carbon emissions in a refined manner based on operating power.

[0045] A unified carbon emission analysis model for energy conversion devices in multi-energy systems was established, and new carbon emission analysis models for network loss and energy storage were proposed. A carbon emission analysis method for the coupling of secondary energy such as electricity, heat, and cooling in multi-energy systems considering dynamic transmission characteristics was proposed. A refined analysis model for carbon emissions from multi-energy systems and users was proposed. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0047] Figure 1 It is a schematic diagram of the system framework of the present invention;

[0048] Figure 2 This is a framework diagram for carbon emission analysis of the multi-energy system of the present invention. DETAILED DESCRIPTION

[0049] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0050] The terms "first, second" and the like in the specification and claims of this application and the above drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. The naming or numbering of steps in this application does not mean that the steps in the method flow must be executed in the time / logical sequence indicated by the naming or numbering. The named or numbered process steps can be changed in the execution order according to the technical purpose to be achieved, as long as the same or similar technical effects can be achieved.

[0051] The modules or submodules described independently may be physically separated or not: they may be implemented by software or hardware, and some modules or submodules may be implemented by software, and the processor may call the software to implement the functions of these modules or submodules, and other modules or submodules may be implemented by hardware, such as by hardware circuits. In addition, some or all of the modules may be selected according to actual needs to achieve the purpose of the present application.

[0052] Please refer to Figure 1-Figure 2The present invention provides a carbon emission analysis method for a multi-energy system and a user, comprising:

[0053] S101: Establishing a multi-energy system, wherein the multi-energy system includes multi-energy transmission, multi-energy conversion and multi-energy use;

[0054] The multi-energy system includes the conversion, transmission, storage and distribution of multiple energy sources such as electricity, heat, cold and gas.

[0055] S102: Multi-energy transmission includes: establishing a first indirect carbon emission transmission model of the power grid, obtaining the indirect carbon emission intensity of the power grid through the first indirect carbon emission transmission model, establishing a second indirect carbon emission transmission model of the lines and nodes in the power grid through the indirect carbon emission intensity of the power grid, and obtaining the indirect carbon emission intensity of any node in the power grid;

[0056] Among them, since electricity is a secondary energy source, the carbon emission responsibility is transferred according to the source of electricity, and the indirect carbon emissions of electricity are determined accordingly. For the power supply node, the first indirect carbon emission transmission model of its power supply indirect carbon emission intensity includes:

[0057]

[0058] In the formula, Power Node Indirect carbon emission intensity of electricity supply, Power Node In the period Direct carbon emissions; For Node In the period total power generation.

[0059] In addition, the nodes in the power grid are regarded as "mixing points" of electric energy, that is, after electric energy with different carbon contents flows into the nodes, the outflowing electric energy has the same environmental properties (that is, the indirect carbon emission intensity is consistent). Based on the above principles, a second indirect carbon emission transmission model for lines and nodes in the power grid is constructed, including:

[0060]

[0061] In the formula, is the indirect carbon emission intensity of any node in the power grid, is the indirect carbon emission intensity of line 1, is the indirect carbon emission intensity of route 2, For line indirect carbon emission intensity; is the electric power of line 1, is the electric power of line 2, For line The electrical power; A collection of lines to inject into this node; The set of outgoing lines for this node.

[0062] S103: Establishing a unified third indirect carbon emission transmission model for the cold and hot networks, obtaining the carbon emission intensity of the cold and hot networks through the third indirect carbon emission transmission model, establishing a fourth indirect carbon emission transmission model for pipelines and nodes in the cold and hot networks through the carbon emission intensity of the cold and hot networks, and obtaining the indirect carbon emission intensity of any node in the cold and hot networks;

[0063] Since cooling and heating have similar physical properties, a unified indirect carbon emission transmission and analysis model for heating and cooling networks is established. Since both heat and cold are secondary energy sources, the carbon emission responsibility is transferred according to the source of heat and cold, and the indirect carbon emissions of heating and cooling are determined accordingly. Since heat and cold are both transmitted through cold and hot media in pipelines, there are cold and hot source nodes and supply and return networks. The third indirect carbon emission transmission model for cold source or heat source nodes includes:

[0064]

[0065] In the formula, Cold and hot source nodes Indirect carbon emission intensity of heating supply; Cold and hot source nodes exist Direct carbon emissions from cooling or heating during the time period; Cold and hot source nodes At the moment The cooling or heating power; is the specific heat capacity of the cold medium or the hot medium; For the flow through the cold and hot source nodes Mass flow rate of cooling or heating pipes; Cold and hot source nodes At the moment The water supply temperature; Cold and hot source nodes At the moment The return water temperature.

[0066] Similarly, the nodes in the heat network are regarded as "mixing points" of cold or heat energy, that is, after cold or heat energy with different carbon contents flows into the node, the cold or heat energy flowing out has the same environmental properties (that is, the indirect carbon emission intensity is consistent). Based on the above principles, the fourth indirect carbon emission transmission model for pipelines and nodes in the heat network is constructed, including:

[0067]

[0068] In the formula, is the indirect carbon emission intensity of any node in the cooling and heating network; is the indirect carbon emission intensity of pipeline 1, is the indirect carbon emission intensity of pipeline 2, For pipeline indirect carbon emission intensity; A collection of pipelines to inject into this node; A collection of outgoing pipes for this node; is the cooling power or heating power of pipeline 1, is the cooling power or heating power of pipeline 2, For pipeline The cooling or heating power, For flow through pipe mass flow rate.

[0069] S104: Establish a direct carbon emission transmission model of the gas grid to obtain the carbon emission intensity of the gas grid.

[0070] For the gas supply network in a multi-energy system, since gas is a primary energy source, the carbon emissions of gas consumption can be calculated directly based on the gas consumption and its corresponding fuel carbon emission factor. The formula is as follows:

[0071]

[0072] In the formula, Carbon emissions from gas consumption; is the carbon emission factor of the fuel gas; The gas consumption.

[0073] By adopting the method or system provided by the present invention, firstly, a carbon emission analysis framework for a multi-energy system is designed, and the carbon emission analysis subjects of the multi-energy system are divided into system operators and users; on this basis, the present invention forms a direct carbon emission analysis method for a multi-energy system based on operating power, forms a carbon emission analysis method for the coupling of secondary energy such as electricity, heat, and cold in a multi-energy system considering dynamic transmission characteristics, forms a carbon emission analysis method for energy storage devices and system losses, and realizes a refined analysis of carbon emissions from multi-energy systems and users.

[0074] In an exemplary embodiment of the present invention, multi-energy conversion includes:

[0075] S201: Divide energy conversion categories according to energy forms, and establish a carbon emission conversion model based on the conversion categories;

[0076] In addition to the transmission of energy in a multi-energy system, there is also the mutual conversion of multiple energy sources. According to the energy form, the energy conversion in a multi-energy system can be divided into several categories: electric heating (such as electric boilers), electric refrigeration (such as refrigerators), gas heating (such as gas boilers), gas-to-electric heating (such as cogeneration units), and electricity-to-gas (such as electrolysis of water to produce hydrogen). For the energy conversion equipment in a multi-energy system, a carbon emission conversion model is constructed. Since the energy conversion element only converts between different energy forms, its total carbon emissions are conserved. According to the above principles, a unified carbon emission conversion model for a multi-energy system can be obtained.

[0077] The carbon emission conversion model includes:

[0078]

[0079] In the formula, For energy conversion equipment Total indirect carbon emissions from energy output; Enter the total indirect carbon emissions for energy conversion equipment; Output energy for the first energy source of the energy conversion device; Output energy for the second energy source of the energy conversion device; For energy conversion equipment Energy output of energy; For energy conversion equipment Indirect carbon emission intensity of energy output.

[0080] S202: Establish a carbon emission model for the energy storage device, and output the carbon emission intensity of the energy storage device during charging or discharging through the carbon emission model of the energy storage device.

[0081] Further construct a carbon emission analysis model for energy storage devices in multi-energy systems. Energy storage devices have charging and discharging processes, and both the charging and discharging processes and the storage process are accompanied by energy loss. Therefore, the carbon emission analysis model of energy storage is divided into two stages: charging and discharging. For the charging stage:

[0082]

[0083] For the energy release phase:

[0084]

[0085] In the formula, is the carbon emissions of energy storage devices, The carbon emissions from the remaining energy stored; The carbon emission intensity of the energy used for charging; To charge energy; the carbon intensity of storing energy for energy storage; The total energy stored for energy storage, The carbon emission intensity of energy storage and release; The energy release efficiency of energy storage.

[0086] In an exemplary embodiment of the present invention, the multi-energy system further includes a system operator and a system user.

[0087] S301: define the carbon emissions of the system operator, including energy conversion equipment, energy transmission loss and purchased secondary energy, and define the carbon emissions of the system user, including primary energy use and secondary energy use;

[0088] The direct carbon emissions of a multi-energy system include the direct fuel consumption of energy conversion equipment in the system and the fuel use of users. For different types of units in a multi-energy system, their direct carbon emissions can be calculated based on their fuel consumption curves and the carbon emission factors of the corresponding fuels. The formula is as follows:

[0089]

[0090] In the formula, For the crew In the period Direct carbon emissions within For the crew In the period The output of Energy in the form of energy; is the fuel consumption calculated according to the unit fuel consumption curve; For the crew Fuel emission factors; For the crew At the moment No. Output power in the form of energy.

[0091] For users in a multi-energy system, their direct carbon emissions are calculated from the fuels they consume and their corresponding carbon emission factors, using the following formula:

[0092]

[0093] In the formula, For users In the period Direct carbon emissions within For users In the period The consumption of the first fuel in For users In the period The consumption of the second fuel in the For users In the period Neidi The consumption of the fuel; is the carbon emission factor for the consumption of the first fuel; For the Carbon emission factors for the consumption of the fuel; is the carbon emission factor for the consumption of the second fuel.

[0094] S302: Establish a system operator carbon emission model, and output the indirect carbon emission intensity of purchased secondary energy, the indirect carbon emission intensity of energy transmission loss, and the direct carbon emission intensity of energy conversion equipment through the system operator carbon emission model;

[0095] The carbon emissions analyzed by multi-energy system operators include indirect carbon emissions from purchased secondary energy, indirect carbon emission losses caused by energy transmission, and direct carbon emissions caused by primary energy consumption, as follows:

[0096]

[0097] in, Total carbon emissions for multi-energy system operators; Indirect carbon emissions from purchasing secondary energy; Indirect carbon emission losses caused by secondary energy transmission; Direct carbon emissions from primary energy consumption.

[0098]

[0099] in, For the Indirect carbon emission intensity of purchased secondary energy; For the The total energy of purchased secondary energy.

[0100]

[0101] in, Indirect carbon emissions from electricity loss; For line Indirect carbon emission intensity; For line Power consumption; Indirect carbon emissions for cooling / heating losses; is the total injected carbon emission of the source node, is the total output carbon emissions of the load node.

[0102]

[0103] in, For the system side Carbon emission factors of primary energy sources; For the system side Amount of primary energy consumed.

[0104] S303: Establish a system user carbon emission model, and output the indirect carbon emission intensity of secondary energy use and the direct carbon emission of primary energy use through the system user carbon emission model.

[0105] The carbon emissions analyzed for multi-energy system users include indirect carbon emissions from the use of secondary energy and direct carbon emissions from primary energy consumption. The calculation formula is as follows:

[0106]

[0107] in, The total carbon emissions of users of the multi-energy system; Direct carbon emissions from the use of primary energy; Indirect carbon emissions from the use of secondary energy.

[0108]

[0109] in, For user side Carbon emission factors of primary energy sources; For user side Amount of primary energy consumed.

[0110]

[0111] in, For users Indirect carbon emission intensity of secondary energy sources; For users The total energy of secondary energy.

[0112] The present invention also provides a carbon emission analysis system for multi-energy systems and users, comprising:

[0113] The energy conversion module is configured to classify energy conversion categories according to the form of energy, establish a carbon emission conversion model based on the conversion categories; establish a carbon emission model for the energy storage device, and output the carbon emission intensity of the energy storage device during charging or discharging through the carbon emission model of the energy storage device;

[0114] The energy transmission module is configured to establish a first indirect carbon emission transmission model of the power grid, obtain the indirect carbon emission intensity of the power grid through the first indirect carbon emission transmission model, establish a second indirect carbon emission transmission model of the lines and nodes in the power grid through the indirect carbon emission intensity of the power grid, and obtain the indirect carbon emission intensity of any node in the power grid; establish a third indirect carbon emission transmission model that unifies the cold and hot networks, obtain the carbon emission intensity of the cold and hot networks through the third indirect carbon emission transmission model, establish a fourth indirect carbon emission transmission model for pipelines and nodes in the cold and hot networks through the carbon emission intensity of the cold and hot networks, and obtain the indirect carbon emission intensity of any node in the cold and hot networks; establish a direct carbon emission transmission model of the gas network to obtain the carbon emission intensity of the gas network;

[0115] The energy use module is configured to receive the energy transmitted by the energy transmission module and convert it into a load;

[0116] A main control module, which is connected to the energy conversion module, the energy transmission module and the energy use module, and is used to execute the above-mentioned carbon emission analysis method for multi-energy systems and users.

[0117] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0118] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. The computer software product is stored in a storage medium, including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods of various embodiments of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk and other media that can store program codes.

[0119] Compared with the analysis of carbon emissions from traditional multi-energy systems, the beneficial effects of this solution are reflected in the following aspects:

[0120] At present, the analysis of carbon emissions from multi-energy systems mainly regards the multi-energy system as a whole and calculates its overall carbon emissions at a macro level. The present invention refines the analysis framework of carbon emissions from multi-energy systems and constructs a more refined carbon emissions analysis model.

[0121] A direct carbon emission analysis method for multi-energy systems based on operating power is proposed, which can analyze carbon emissions in detail according to the operating power.

[0122] A unified carbon emission analysis model for energy conversion devices in multi-energy systems was established, and new carbon emission analysis models for grid loss and energy storage were proposed.

[0123] A carbon emission analysis method for coupling secondary energy such as electricity, heat and cooling in a multi-energy system considering dynamic transmission characteristics is proposed.

[0124] A refined analysis model for multi-energy systems and user carbon emissions is proposed.

[0125] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A carbon emission analysis method for multi-energy systems and users, characterized in that: include: Establishing a multi-energy system, which includes multi-energy transmission, multi-energy conversion and multi-energy use; The multi-energy transmission includes: Establishing a first indirect carbon emission transmission model for the power grid, obtaining the indirect carbon emission intensity of the power grid through the first indirect carbon emission transmission model, establishing a second indirect carbon emission transmission model for the lines and nodes in the power grid through the indirect carbon emission intensity of the power grid, and obtaining the indirect carbon emission intensity of any node in the power grid; Establish a unified third indirect carbon emission transmission model for the hot and cold networks, obtain the carbon emission intensity of the hot and cold networks through the third indirect carbon emission transmission model, establish a fourth indirect carbon emission transmission model for pipelines and nodes in the hot and cold networks through the carbon emission intensity of the hot and cold networks, and obtain the indirect carbon emission intensity of any node in the hot and cold networks; Establish a direct carbon emission transmission model of the gas grid and obtain the carbon emission intensity of the gas grid; The first indirect carbon emission transfer model includes: In the formula, For power nodes Indirect carbon emission intensity of electricity supply, For power nodes In the period Direct carbon emissions; For Node In the period Total power generation; The second indirect carbon emission transfer model includes: In the formula, is the indirect carbon emission intensity of any node in the power grid, is the indirect carbon emission intensity of line 1, is the indirect carbon emission intensity of route 2, For Line indirect carbon emission intensity; is the electric power of line 1, is the electric power of line 2, For Line The electrical power; A collection of lines to inject into this node; is the set of outgoing lines of the node; The third indirect carbon emission transfer model includes: In the formula, Cold and hot source nodes Indirect carbon emission intensity of heating supply; Cold and hot source nodes exist Direct carbon emissions from cooling or heating during the time period; Cold and hot source nodes At the moment The cooling or heating power; is the specific heat capacity of the cold medium or the hot medium; For the flow through the cold and hot source nodes Mass flow rate of cooling or heating pipes; Cold and hot source nodes At the moment The water supply temperature; Cold and hot source nodes At the moment The return water temperature; The fourth indirect carbon emission transfer model includes: In the formula, is the indirect carbon emission intensity of any node in the cooling and heating network; is the indirect carbon emission intensity of pipeline 1, is the indirect carbon emission intensity of pipeline 2, For pipeline indirect carbon emission intensity; A collection of pipelines to inject into this node; A collection of outgoing pipes for this node; is the cooling power or heating power of pipeline 1, is the cooling power or heating power of pipeline 2, For pipeline The cooling or heating power, For flow through pipe mass flow rate.

2. A carbon emission analysis method for multi-energy systems and users according to claim 1, characterized in that: The multi-energy conversion includes: Divide energy conversion categories according to energy forms, and establish a carbon emission conversion model based on the conversion categories; A carbon emission model for the energy storage device is established, and the carbon emission intensity of the energy storage device during charging or discharging is output through the carbon emission model of the energy storage device.

3. A carbon emission analysis method for multi-energy systems and users according to claim 2, characterized in that: The multi-energy system also includes a system operator and a system user, and the carbon emissions of the system operator are defined, including energy conversion equipment, energy transmission losses and purchased secondary energy, and the carbon emissions of the system user are defined, including primary energy use and secondary energy use; Establish a system operator carbon emission model, and output the indirect carbon emission intensity of purchased secondary energy, the indirect carbon emission intensity of energy transmission loss, and the direct carbon emission intensity of energy conversion equipment through the system operator carbon emission model; A system user carbon emission model is established, and the indirect carbon emission intensity of secondary energy use and the direct carbon emission of primary energy use are output through the system user carbon emission model.

4. A carbon emission analysis method for multi-energy systems and users according to claim 3, characterized in that: The establishment of the carbon emission conversion model comprises: In the formula, Energy conversion equipment Total indirect carbon emissions from energy output; Enter the total indirect carbon emissions for energy conversion equipment; Output energy for the first energy source of the energy conversion device; Output energy for the second energy source of the energy conversion device; Energy conversion equipment Energy output from energy sources; Energy conversion equipment Indirect carbon emission intensity of energy output.

5. A carbon emission analysis method for multi-energy systems and users according to claim 4, characterized in that: The carbon emission model of the energy storage device is established including: In the formula, is the carbon emissions of energy storage devices, The carbon emissions from the remaining energy stored; The carbon emission intensity of the energy used for charging; To charge energy; the carbon intensity of storing energy for energy storage; The total energy stored for energy storage, The carbon emission intensity of energy storage and release; The energy release efficiency of energy storage.

6. A carbon emission analysis system for multi-energy systems and users, characterized in that: include: The energy conversion module is configured to classify energy conversion categories according to the form of energy, establish a carbon emission conversion model based on the conversion categories; establish a carbon emission model for the energy storage device, and output the carbon emission intensity of the energy storage device during charging or discharging through the carbon emission model of the energy storage device; An energy transmission module is configured to establish a first indirect carbon emission transmission model of the power grid, obtain the indirect carbon emission intensity of the power grid through the first indirect carbon emission transmission model, establish a second indirect carbon emission transmission model of the lines and nodes in the power grid through the indirect carbon emission intensity of the power grid, and obtain the indirect carbon emission intensity of any node in the power grid; establish a third indirect carbon emission transmission model that unifies the cold and hot networks, obtain the carbon emission intensity of the cold and hot networks through the third indirect carbon emission transmission model, establish a fourth indirect carbon emission transmission model of the pipelines and nodes in the cold and hot networks through the carbon emission intensity of the cold and hot networks, and obtain the indirect carbon emission intensity of any node in the cold and hot networks; Establish a direct carbon emission transmission model of the gas grid and obtain the carbon emission intensity of the gas grid; The energy use module is configured to receive the energy transmitted by the energy transmission module and convert it into a load; A main control module, which is connected to the energy conversion module, the energy transmission module and the energy use module, and is used to execute a carbon emission analysis method for a multi-energy system and a user as described in any one of claims 1-5.

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