A method for modeling multi-flow mechanism of integrated energy system

Abstract

This invention discloses a multi-flow modeling method for energy-energy-temperature (EFT) mechanisms in integrated energy systems. First, addressing the limitations of traditional IES energy-energy flow mechanism models, a multi-flow mechanism model for components, energy stations, pipeline branches, and media mixing nodes is established. Notably, during energy conversion and media mixing, energy quality degradation within components, energy stations, and media mixing nodes leads to some EFT depreciation into TFT. This invention defines the TFT generated during this process as TFT increase and incorporates it into the TFT flow mechanism model. Then, the sources, composition, and transformation laws of power loss, EFT loss, and TFT increase in IES components, energy stations, and media mixing nodes, as well as the energy-energy-temperature (EFT) multi-flow emission characteristics of pipeline branches, are investigated. Finally, the rationality and correctness of the proposed model and laws are verified through the analysis of the calculation results of the energy-energy-temperature (EFT) multi-flow distribution in a numerical example system.

Description

Technical Field

[0001] This invention relates to the field of integrated energy systems and the field of multi-energy coupling link modeling, and in particular to a multi-energy-multi-flow mechanism modeling method for integrated energy systems that considers the comprehensive change law and transformation relationship of energy, energy, and thermal flows. Background Technology

[0002] Against the backdrop of accelerated energy transition, the energy sector is undergoing and will continue to undergo extensive and profound systemic changes. Improving energy efficiency and achieving high-quality energy utilization have become core demands for industry development. Integrated energy systems, as smart energy networks that integrate and complement multiple energy sources, play a crucial role in improving energy efficiency and promoting the consumption of renewable energy. However, with the increasing diversity of energy forms and the growing complexity of coupling relationships within these systems, accurately characterizing the changing energy quality of the system has become an important prerequisite for ensuring the efficient operation of integrated energy systems.

[0003] Currently, in the analysis and modeling research of integrated energy systems, traditional energy flow mechanism models are mostly based on the first law of thermodynamics, focusing on the quantitative conversion and balance of various energy sources such as electricity, gas, heat, and cold. These models construct multi-energy flow balance matrices, energy hubs, and other related models. However, this type of research completely ignores the quality attributes of energy and cannot reflect the changing patterns of energy's ability to perform work. To overcome this deficiency, a backflow mechanism model based on the second law of thermodynamics has been proposed and has become a core tool for energy quality analysis of integrated energy systems. Related research has constructed backflow calculation models around components, pipelines, and energy stations, achieving a quantitative description of the transmission, distribution, and loss of backflow in the system.

[0004] However, the aforementioned studies have not fully considered the comprehensive variation patterns and transformation relationships of energy, thermal, and varnish in integrated energy systems. Traditional thermal flow mechanism models have failed to systematically reveal the mechanism of thermal loss generation and its intrinsic connection with varnish, making it difficult to fully characterize the characteristics and deep physical essence of work capacity loss and energy quality degradation in the system during energy conversion, transmission, storage, and medium mixing. In fact, varnish, as the portion of energy that cannot be converted into useful work due to environmental limitations, directly describes the main links and root causes of thermal loss in the system, and is an indispensable component of energy quality analysis. However, existing models cannot achieve refined breakdown and precise source tracing of thermal loss, which also limits the depth of energy efficiency and thermal efficiency optimization in integrated energy systems.

[0005] Therefore, it is necessary to break through the limitations of the traditional energy flow-energy flow mechanism model of integrated energy systems, fully incorporate the changes and transformation characteristics of energy flow in system analysis, establish a multi-flow mechanism model of energy-energy-energy flow in integrated energy systems, realize the coordinated characterization of the "quantity-quality-loss" of energy utilization in the system, and provide theoretical support for practical scenarios such as regional energy system planning and multi-energy coordinated scheduling. Summary of the Invention

[0006] The purpose of this invention is to overcome the limitations of traditional energy flow-current mechanism models in existing integrated energy systems and to provide a modeling and analysis method for energy-current-current multi-flow mechanisms in integrated energy systems. This invention integrates the first and second laws of thermodynamics, incorporating current flow mechanisms into the traditional energy flow and current flow analysis framework. It systematically constructs an energy-current-current multi-flow mechanism model for all stages of an integrated energy system, comprehensively revealing the inherent laws and transformation relationships of energy quantity loss, work capacity loss, and energy quality degradation during energy conversion, transmission, and medium mixing processes. This enables precise source tracing of system current losses and refined characterization of energy quality degradation characteristics, providing solid theoretical support and methodological basis for the planning and design of integrated energy systems, multi-energy coordinated scheduling, and energy efficiency improvement.

[0007] The objective of this invention is achieved through the following technical solution: A multi-flow mechanism modeling method for integrated energy systems includes: S1. Establish a multi-flow mechanism model of energy-energy-energy in the components of the integrated energy system. Based on the input and output relationship of energy flow and energy flow of the components, calculate the power loss and energy loss of the components, and calculate the energy increase of the components based on the increase of energy during the internal energy conversion process. S2. Establish a multi-flow mechanism model of energy station in integrated energy system, aggregate the power loss, emission loss and emission of each component in the energy station, and calculate the overall power loss, emission loss and emission increase of the energy station. S3. Establish a multi-flow mechanism model of energy-energy-energy at the medium mixing node in the integrated energy system. Based on the laws of thermodynamics, calculate the total energy conservation relationship before and after medium mixing, the mixing energy loss, and the mixing energy increase generated by the depreciation of high-temperature heat energy on the inflow side during the mixing process. S4. Establish a multi-flow mechanism model of energy-energy-energy in pipeline branches in an integrated energy system, calculate the power loss, emission energy loss and emission energy of pipeline branches, so as to characterize the multi-flow emission characteristics of pipeline branches in the energy transmission process. S5. Based on the energy-energy-energy multi-flow mechanism model of the aforementioned components, energy stations, medium mixing nodes, and pipeline branches, the source composition of power loss, energy loss, and energy increase in the entire process of the integrated energy system is revealed, and the mapping relationship between the decline in the integrated energy system's work capacity and the degradation of energy quality is determined.

[0008] Preferably, in step S1, the components are divided into a first category of components with an energy conversion efficiency of less than 1 and a second category of components with an energy conversion efficiency of greater than 1, and modeled accordingly: For the first category of components, their losses include three parts: emission losses, emission losses, and the depreciation of some input energy caused by internal energy quality degradation; For the second category of components, their losses are quantified as the depreciation of some external driving energy during the process of improving the energy quality of the input end by high-quality external driving energy; The first category of components includes cogeneration, gas boilers, electric boilers, and transformers; The second category of components includes heat pumps, electric chillers, and absorption chillers.

[0009] Preferably, the power loss of the first type of component is equal to the difference between the total input power and the total output power of the component; The increase in ν during the energy conversion process within the first type of element is equal to the difference between the total output ν current and the total input ν current of the first type of element.

[0010] Preferably, in step S2, the power loss of the energy station is equal to the difference between the total input power and the total output power of the energy station; Energy station losses include three parts: energy station emission losses, energy station emissions, and the depreciation of some input energy caused by the degradation of energy quality within the energy station. The energy station voltage increase is defined as the increase in voltage during the energy conversion process within the energy station. Its value is equal to the difference between the total output voltage and the total input voltage of the energy station, and is also equal to the sum of the voltage increases of all components in the energy station.

[0011] Preferably, in step S3, the mixing loss is equal to the difference between the sum of the end flows of all pipe segments flowing into the mixing node before mixing and the sum of the beginning flows of all pipe segments flowing out of the mixing node after mixing; the mixing gain is equal to the difference between the sum of the beginning flows of all pipe segments flowing out of the mixing node after mixing and the sum of the end flows of all pipe segments flowing into the mixing node before mixing, and the mixing loss is numerically equal to the mixing gain.

[0012] Preferably, in step S4, for the branch of the thermal system pipeline, the discharge loss of the supply and return water pipelines refers to the energy in the power loss of the supply and return water pipelines that theoretically still has the ability to do work; the discharge loss of the supply and return water pipelines refers to the energy in the power loss of the supply and return water pipelines that theoretically cannot do work at all. The power loss of its supply and return water pipes is heat loss, that is, the supply and return water pipes dissipate heat to the environment.

[0013] This invention also provides a multi-flow mechanism modeling device for integrated energy systems, comprising: The component mechanism module is used to establish a multi-flow mechanism model of energy, power, and energy of components in an integrated energy system. Based on the input and output relationship of energy flow and power flow of the components, it calculates the power loss and power loss of the components, and calculates the power increase of the components based on the increase of power during the internal energy conversion process. The energy station mechanism module is used to establish a multi-flow mechanism model of energy stations in an integrated energy system, which aggregates the power loss, emission loss and emission of each component in the energy station, and calculates the overall power loss, emission loss and emission increase of the energy station. The medium mixing node mechanism module is used to establish an energy-energy-energy multi-flow mechanism model for medium mixing nodes in an integrated energy system. Based on the laws of thermodynamics, it calculates the total energy conservation relationship before and after medium mixing, mixing energy loss, and mixing energy increase generated by the depreciation of high-temperature heat energy on the inflow side during the mixing process. The pipeline branch mechanism module is used to establish a multi-flow mechanism model of energy-energy-energy in pipeline branches in an integrated energy system, and to calculate the power loss, emission energy loss and emission energy of pipeline branches to characterize the multi-flow emission characteristics of pipeline branches in the energy transmission process. The integrated mechanism module is used to reveal the sources and components of power loss, energy loss and energy increase in the entire integrated energy system based on the energy-energy-energy multi-flow mechanism model of the components, energy stations, medium mixing nodes and pipeline branches, and to determine the mapping relationship between the decline in the integrated energy system's work capacity and the degradation of energy quality.

[0014] The present invention also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the steps of the integrated energy system energy-flow multi-flow mechanism modeling method.

[0015] The present invention also provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the integrated energy system energy-flow multi-flow mechanism modeling method.

[0016] Compared with the prior art, the beneficial effects of the technical solution of the present invention are as follows: 1. This invention is the first to construct a multi-flow mechanism model of energy, energy, and energy, covering components, energy stations, pipeline branches, and medium mixing nodes of an integrated energy system. It incorporates the energy increase generated during energy conversion and mixing into the modeling system, fully revealing the comprehensive change law and transformation relationship of energy, energy, and energy. It overcomes the shortcomings of traditional models that cannot fully characterize the mechanism of system work capacity loss and energy quality decay, and reveals the inherent operating law of the integrated energy system.

[0017] 2. This invention achieves refined breakdown and source tracing of energy loss, clarifying the sources and components of power loss, energy loss, and energy degradation in each stage of the system. Energy loss is subdivided into three parts: emission energy loss, emission energy, and internal energy depreciation. It accurately quantifies the respective impacts of energy quantity loss and quality degradation on the system's work capacity reduction, breaking the limitation of traditional energy flow models that treat energy loss as a single whole, and achieving a synergistic representation of energy utilization in terms of "quantity-quality-loss".

[0018] 3. The model constructed in this invention, while maintaining the second-level solution efficiency of traditional models, can achieve complete output of multi-flow distribution information. This allows the invention to be directly applied to engineering scenarios such as regional energy system planning, multi-energy coordinated scheduling, and equipment parameter optimization, accurately identifying system energy efficiency and cost-effectiveness shortcomings. It provides solid theoretical support and analytical tools for high-quality energy supply and dual improvement of energy efficiency and cost-effectiveness in integrated energy systems, taking into account solution efficiency and supporting engineering applications. Attached Figure Description

[0019] Figure 1 for η <Schematic diagram of the loss composition of type 1 components.

[0020] Figure 2 for η <Type 1 component input / output diagram.

[0021] Figure 3 for η >Schematic diagram of the loss composition of Class 1 components.

[0022] Figure 4 for η >Type 1 component input / output diagram.

[0023] Figure 5 This is a schematic diagram of the components of an energy station.

[0024] Figure 6 The diagram shows the input and output of the energy station.

[0025] Figure 7 The input and output diagram for the medium mixing node is shown.

[0026] Figure 8 The diagram shows the input and output of the medium mixing node.

[0027] Figure 9 This is a schematic diagram of the IES example.

[0028] Figure 10 The structure consists of energy stations ES1 and ES2.

[0029] Figure 11 The results are the energy flow calculation results for ES2.

[0030] Figure 12 The result of the ES2 flow calculation.

[0031] Figure 13 The result is the calculation result for ES2 flow.

[0032] Figure 14 For heating network water supply pipelines l h4 Energy flow calculation results.

[0033] Figure 15 For heating network water supply pipelines l h4 Flow calculation results.

[0034] Figure 16 For heating network water supply pipelines l h4 Flow calculation results.

[0035] Figure 17 The energy flow calculation results are for water supply node 5.

[0036] Figure 18 The result is the flow calculation for water supply node 5.

[0037] Figure 19 The result is the flow calculation for water supply node 5. Detailed Implementation

[0038] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only for explaining the present invention and are not intended to limit the present invention.

[0039] Example 1 This embodiment provides a comprehensive energy system multi-flow mechanism modeling method that considers the comprehensive variation laws and transformation relationships of energy, thermal energy, and thermal energy, as detailed below: S1. Constructing a multi-flow mechanism model for the energy-temperature-temperature components: In an integrated energy system, a component refers to a basic physical device or unit that constitutes the entire system and can independently perform a specific function, such as power generation, energy storage, energy conversion, energy distribution, or energy consumption. Components do not exist in isolation; they are interconnected through energy networks such as power grids, heating networks, gas networks, and chilled water networks to realize the transmission and exchange of energy.

[0040] This embodiment mainly focuses on modeling the energy-current-current multi-flow mechanism for two types of components: 1) Energy (quantity) conversion efficiency is less than 1 ( The first category of components includes, for example, combined heat and power (CHP), gas boilers (GB), electric boilers (EB), transformers, etc.; 2) energy (quantity) conversion efficiency greater than 1 ( The second type of components includes components such as heat pumps, electric chillers, and absorption chillers.

[0041] S101, The specific energy flow mechanism model of the component is as follows: (1011) For For this type of component, the power loss is equal to the difference between the total input power and the total output power of the component, calculated as shown in equation (1): (1); In the formula: for Power loss of such components; for Total output power of the components; for Total input power of the component class. Units are all in kW. Definition: Both the total input and output power of the component are positive.

[0042] (1012) According to the second law of thermodynamics, Such components cannot spontaneously perform energy conversion processes and must be driven by external energy. The high-quality energy driven by the outside depreciates during the energy conversion process, but improves the energy quality at the input end by doing work. The performance coefficient of a component is calculated as shown in equation (2): (2); In the formula: for Total output power of the components; for Total input power of the type of components; for Total external drive power of the components, in kW. for The actual average performance coefficient of a component. Definition: The total input, output, and external drive power of the component are all positive.

[0043] S102, The specific model of the component current flow mechanism is as follows: (1021) Component loss equals The difference between the total input current and the total output current of a component is calculated as shown in equation (3): (3); In the formula: for Damage to similar components; for Total input current for class components; for Total output current of this type of component. Units are all in kW. Definition: Both the total input and output current of the component are positive.

[0044] based on The input-output energy balance relationship of the component can be obtained by equation (4). Based on equations (3) and (4), further simplification yields equation (5). The specific calculation is as follows: (4); (5); In the formula: and They are respectively Total input and output current of the component. Units are kW.

[0045] when η When a component of type <1 has more than one type of energy source at its input or output, it is necessary to calculate the "average energy quality coefficient" of all energy sources at the input and output terminals to facilitate the measurement of energy quality. The specific calculation is as follows: (6); In the formula: , They are respectively η Average energy mass coefficient at the input and output terminals of Class 1 components. η In the energy conversion process of type 1 components, the energy quality at the output is lower than that at the input, therefore... In formula (6), the first formula describes the average energy quality coefficient at the input end as the ratio of the total input current to the total input power; the second formula describes the average energy quality coefficient at the output end as the ratio of the total output current to the total output power.

[0046] From formula (5), we can see that, Quantization of component loss During energy conversion, due to various irreversible processes, the output of a component experiences a decrease in its ability to perform work compared to its input. This decrease in work capacity is reflected in... The amount of energy at the output terminal of the component is reduced ( The power loss of similar components is also reflected in The power quality at the output of such components is reduced. Various irreversible processes within the component cause a portion of the input to degrade to a value that is then transmitted to the output, resulting in... The output of the component increases compared to its input. The power losses of such components are ultimately released into the external environment. The energy released into the environment is then assessed based on its potential for energy conversion into work. Power losses in such components can be categorized into emission losses and emission losses. Therefore, The component loss comprises three parts: emission loss, emission degradation, and the depreciation of some input loss due to internal energy quality decay. See [link to relevant documentation]. Figure 1 .

[0047] Component emission loss refers to The power losses of certain components still theoretically contain energy capable of performing work. For example: 1) High-temperature exhaust gas, whose exhaust temperature is much higher than the ambient temperature, carries a certain amount of heat. This heat is a component of emission losses; 2) Unburned carbon, if the fuel is not completely burned, the unburned carbon particles themselves still have chemical properties, which is also a component of emission losses.

[0048] The composition of emission losses for such components is quite complex, mainly including: flue gas emission losses, cooling water / waste heat liquid losses, ash / solid waste losses, and heat dissipation losses from component surfaces and connecting pipes. Calculations need to be performed according to the type of emissions, as shown in Table 1. Types of emissions and classification of emissions damage for various components.

[0049] η In practical calculations, the emission losses of Class 1 components can be approximated by the thermal losses from flue gas, the chemical losses from flue gas, the liquid thermal losses from cooling water / waste heat, the thermal losses from ash / solid waste, and the chemical losses from ash / solid waste. η The sum of heat dissipation losses from the surface of the components and the connecting pipes of type 1 is calculated as shown in equation (7): (7); In the formula: for η <Class 1 component emission loss (kW); for η <Class 1 components emit flue gas heat (kW); for η <Class 1 component emission chemical properties (kW); for η <Class 1 component discharge cooling water / waste heat liquid heat (kW); for η <Class 1 components emit ash / solid waste heat (kW); for η <Class 1 component emission ash / solid waste chemical capacity (kW); for η <Class 1 component surface heat dissipation (kW); for η <Class 1 component connection pipe heat dissipation (kW).

[0050] Component emissions refer to In the power loss of such components, energy that theoretically cannot do any work is considered to be incapable of performing any work. It is... The portion of power loss in a component that is in balance with the environmental energy level.

[0051] The specific calculation for the emission of such components is as shown in equation (8): (8); In the formula: for Emissions of this type of component are measured in kWh. The unit is kW.

[0052] During the energy conversion process of such components, due to various irreversible internal processes, a portion of the input voltage (ν) degrades to voltage (ν), which is then transferred to the output, causing the output voltage to be higher than the input voltage and reducing the energy quality at the output. This process occurs during... Inside this type of component, there is no energy exchange with the external environment. Therefore, this portion of energy generated by the degradation of energy quality and transferred to the output is... The only source of change in the total output of a component relative to its total input. Calculated as shown in equation (9): (9); In the formula: express The amount of depreciation in input voltage caused by the degradation of internal energy quality of such components is expressed in kW.

[0053] (1022) Current balance relationship of similar components The specific calculation of component loss is as shown in equation (10): (10); In the formula: for Damage to similar components; for Total input current for class components; for Total output current of the component; for Total external driving current for this type of component. Units are all in kW. Definition: All inputs, outputs, and external drive currents of the component are positive.

[0054] based on The input-output energy balance relationship of the component can be obtained by equation (11). Based on equations (10) and (11), further simplification yields equation (12). The specific calculation is as follows: (11); (12); In the formula: , and They are respectively The total input, output, and external drive current of the component are all in kW.

[0055] when η When a component of type 1 has more than one type of energy source at its input, output, or external drive terminals, it is necessary to calculate the "average energy quality coefficient" of all energy sources at these terminals to facilitate the evaluation of their quality. The specific calculation is as follows: (13); In the formula: , , They are respectively η Average energy density of input, output and external drive terminals of Class 1 components. η >In Class 1 components, the external driver itself depreciates during energy conversion, but improves the energy quality at the input end by performing work. In Equation (13), the first formula describes the average energy quality coefficient at the input end as the ratio of the total input current to the total input power; the second formula describes the average energy quality coefficient at the output end as the ratio of the total output current to the total output power; and the third formula describes the average energy quality coefficient at the external drive end as the ratio of the total external drive current to the total external drive power.

[0056] From formula (12), we can see that Quantization of component loss The extent to which the high-quality external driving energy of a component decreases in its ability to perform work during the process of improving the energy quality at the input end. According to equation (2), compared to the ideal state where all external driving energy is used to improve the energy quality at the input end, in the actual state, the external driving energy includes energy used for compensation. This refers to the extra energy lost through various power losses in similar components. This extra energy is also transferred to the output, thus contributing to the improvement of energy quality at the input. There is no loss of energy in this type of component. The decrease in power output is only reflected in the process of improving the energy quality at the input end. Due to various irreversible processes, some external drives are degraded.

[0057] The loss of such components is The depreciation of some external drivers during the process of improving the energy quality of the internal input terminal of the component is described in [reference]. Figure 3 The calculation is as shown in equation (14): (14); In the formula: for The amount of depreciation of a portion of the external drive during the process of improving the energy quality of the internal input terminal of a component, expressed in kW.

[0058] S103, Component flow mechanism model: (1031) Definition The number of class components has increased to The increase in energy during the internal energy conversion process of this type of component is equal to The difference between the total output current and the total input current of a component is shown in the figure. Figure 2 .definition The total input and total output current of the component are both positive, and are calculated as shown in equation (15): (15); In the formula: for The increase in power (kW) for this type of component.

[0059] To eliminate η The interference of the capacity size of Class 1 components on the degree of power quality degradation at the quantization input is defined in this embodiment. η The energy quality degradation rate of Class 1 components is calculated as follows: (16); In the formula: for η <1 type component energy quality degradation rate. The above formula describes the energy quality degradation rate. η <Class 1 component increase (i.e. η <The amount of depreciation in input voltage caused by the degradation of internal energy quality of Class 1 components accounts for (the percentage) η <1 The ratio of the total input of the component.

[0060] Components can be precisely quantized The degree of energy quality degradation at the output end compared to the input end during the energy conversion process of such components.

[0061] (1032) Definition The number of class components has increased to The increase in energy during the internal energy conversion process of a component. Definition The total input, output, and external drive current of this type of component are all positive, see [link / reference]. Figure 4 The calculation is as shown in equation (17): (17); In the formula: for The increase in power for this type of component. All units are in kW.

[0062] To eliminate η>1. The interference of component capacity size on the degree of energy quality degradation at the quantification external drive end is defined in this embodiment. η The energy quality degradation rate of Class 1 components is calculated as follows: (18); In the formula: η >1 type component energy quality degradation rate The above formula describes η >Class 1 component increase (i.e. η >The depreciation of some external drivers during the process of improving input energy quality in Class 1 components accounts for (the percentage) η >1 The ratio of total external driving force of components.

[0063] The addition of similar components can be precisely quantified. The degree of degradation in the quality of externally driven energy during the energy conversion process of such components is also... This is a fundamental manifestation of the decline in the ability of externally driven energy to perform work in such components.

[0064] S2. Construct a multi-flow mechanism model for the energy station ES: The specific energy flow mechanism model of the energy station is as follows: The power loss of the energy station is equal to the difference between the total input power and the total output power of the energy station, calculated as shown in equation (19): (19); In the formula: For power loss at the energy station; This represents the total output power of the energy station. This represents the total input power of the energy station. For the i-th Power loss of the components, all in kW. n represents the power loss of the energy station. The number of class components. For all in the energy station The sum of power losses of the components. Definition: Both the input and output power of the energy station are positive.

[0065] The specific S201 and ES flow mechanism model of the energy station are as follows: The energy station loss is equal to the difference between the total input VES and the total output VES of the energy station, calculated as shown in equation (20): (20); In the formula: For the energy station to suffer damage; Total output of the energy station; Total input to the energy station; Let be the power loss of the j-th element, in kW. m is the total number of elements in the energy station. This represents the sum of losses of all components in the energy station. Definition: Both the input and output losses of the energy station are positive.

[0066] Based on the energy-energy-energy-energy multi-flow balance relationship of the energy station's input and output, equation (21) can be obtained. Based on equations (20) and (21), further simplification yields equation (22). The specific calculation is as follows: (twenty one); (twenty two); In the formula: and These represent the total input and output current of the energy station, respectively. The unit is kW.

[0067] When an energy station receives more than one type of energy at its input or output, it is necessary to calculate the average energy quality coefficient (EMC) of all energy sources at both the input and output ends to facilitate the assessment of energy quality. The specific calculation is as follows: (twenty three); In the formula: , These are the average energy quality coefficients at the input and output ends of the energy station, respectively. During the energy conversion process at the energy station, the energy quality at the output end is lower than that at the input end. The first formula in equation (23) describes the average energy quality coefficient at the input end as the ratio of the total input current to the total input power; the second formula describes the average energy quality coefficient at the output end as the ratio of the total output current to the total output power.

[0068] As can be seen from formula (23), the power loss of an energy station quantifies the degree of decrease in the energy's ability to perform work at the output end compared to the input end during the energy conversion process due to various irreversible processes. The decrease in the ability to perform work is reflected both in the reduction of the amount of energy at the output end of the energy station (power loss of energy station components) and in the reduction of the energy quality at the output end of the energy station (various irreversible processes inside the energy station cause some of the input power to depreciate to , which is then transmitted to the output end, making the output denominator of the energy station higher than the input denominator). Based on whether the energy in the power loss of the energy station has the ability to perform work, the power loss of the energy station can be divided into energy station emission power loss and energy station emission power loss.

[0069] Energy station emission losses refer to the energy within an energy station's power loss that theoretically still has the capacity to perform work. Energy station emission losses equal all energy in the energy station... The sum of emission losses of the components is calculated as shown in equation (24): (twenty four); In the formula: To reduce emissions from energy stations; For the i-th energy station The emission loss of this type of component is expressed in kW.

[0070] Energy station emissions (VCO) refer to the energy that theoretically cannot perform any work within the power loss of an energy station. It represents the portion of the energy station's power loss that achieves equilibrium with the environmental energy quality. Energy station emissions (VCO) equal to all energy station emissions. The sum of the emissions of the same type of components.

[0071] The specific calculation of emissions from the energy station is as follows (25): (25); In the formula: Emissions from energy stations; For the i-th energy station The emissions of these components are in kW.

[0072] During the energy conversion process at the energy station, various irreversible processes within the station cause a portion of the input energy (E) to degrade into t, which is then transferred to the output, resulting in an increase in output t compared to input t and a reduction in the energy quality at the output. This process occurs within the energy station and involves no energy exchange with the external environment. Therefore, this portion of t generated by the reduction in output energy quality and transferred to the output is the sole source of the change in the total output t compared to the total input t. The calculation is as shown in equation (26): (26); In the formula: This indicates the amount of depreciation in input voltage caused by the degradation of energy quality within the energy station, with units of kW.

[0073] In conclusion, see Figure 5 According to equations (19)-(26), the total energy station loss can be obtained. The calculation is as shown in equation (27): (27); S202, the specific flow mechanism model of the energy station is as follows: From the perspective of energy, the energy station energy flow mechanism model focuses on the changes in energy within the energy station and the reasons for these changes, as detailed below.

[0074] The increase in energy station current (Vi) is defined as the increase in Vi during the energy conversion process within the energy station, equal to the difference between the total output Vi and the total input Vi of the energy station. (See [reference]). Figure 6 The calculation is as shown in equation (28): (28); In the formula: Increase the number of energy stations; This represents the increase in power (kW) for the j-th element, with units of kW. This is the sum of the voltage increments of all components in the energy station. Both the input voltage and output voltage of the energy station are defined to be positive.

[0075] To eliminate the interference of energy station capacity size on the quantification of energy quality degradation at the input end, this embodiment defines an energy station energy quality degradation rate, which is calculated as follows: (29); In the formula: Let be the energy quality degradation rate of the energy station. The above formula describes the ratio of the energy station's energy quality degradation (i.e., the amount of depreciation of some input energy caused by the energy quality degradation within the energy station) to the total input energy of the energy station.

[0076] As can be seen from equations (26) and (28), the energy station's energy quality can accurately quantify the degree of energy quality degradation at the output end compared to the input end during the energy conversion process; it is also an important manifestation of the energy station's energy performance degradation at the output end compared to the input end.

[0077] According to formula (28), the energy station loss It can be expressed as equation (30): (30); S3. Construct a multi-flow mechanism model of energy, energy, and energy in pipeline branches; This embodiment assumes that electrical energy is a high-quality energy source, and the active power loss of power lines is equivalent to the emission loss of power lines. The emission loss of power lines is not considered. Based on the IES steady-state energy flow analysis assumption, this embodiment focuses on the emission flow analysis of natural gas systems under the conditions of ignoring natural gas loss, changes in gas quality, and the absence of compressors. Therefore, the power loss and emission loss of natural gas systems are not considered. Thus, this embodiment mainly focuses on the energy-emission-emission multi-flow mechanism modeling of pipeline branches in thermal systems.

[0078] S301, Energy Flow Mechanism Model of Pipeline Branch: The heating network pipeline is a heat energy transmission system. Its core task is to deliver hot water / steam to users. The power loss in the process includes: 1) heat dissipation loss, that is, heat dissipation from the pipeline to the environment, which is the main focus of this embodiment; 2) power consumption of the circulating water pump, that is, the electrical energy required to overcome the pipeline resistance, which is usually included in the energy consumption of the ES auxiliary machine, and will not be discussed in this embodiment.

[0079] The power loss of the supply and return water pipelines is calculated as shown in equation (31): (31); In the formula: For pipeline power loss (kW), c p The specific heat capacity of water (kJ / (kg·K)) The mass flow rate of the water in the pipeline (kg / s) The temperature at the beginning of the pipeline (K). Temperature at the end of the pipe (K).

[0080] S302, Flow mechanism model of pipeline branch: The flow mechanism model of the branch pipelines in the thermal system focuses on the discharge losses of the supply and return water pipelines, which refers to the energy in the power loss of the supply and return water pipelines that still theoretically has the capacity to do work. The calculation is as shown in equation (32): (32); In the formula: For pipeline discharge loss (kW), The potential at the beginning of the pipeline (kJ / kg) The potential at the end of the pipeline (kJ / kg).

[0081] S303, Flow mechanism model of pipeline branch: The thermal system pipeline branch flow mechanism model focuses on the discharge of thermal energy from the supply and return water pipes, which refers to the energy that theoretically cannot do any work in the power loss of the supply and return water pipes. Because... , Therefore, in the supply and return water pipelines of the heating network, the power loss is much greater than the discharge loss, and the vast majority of the power loss is discharge. The calculation is as shown in equation (33): (33); In the formula: For pipeline discharge (kW).

[0082] S4. Construct a multi-flow mechanism model for media hybrid nodes: In an Integrated Energy System (IES), a media mixing node refers to a specific location where two or more fluid media flows with different parameters converge and mix to form a single outlet flow. The parameters are primarily temperature and flow rate, but may also involve pressure or other components.

[0083] Preferably, under the condition of satisfying the steady-state assumption, this embodiment simplifies the flow calculation of the natural gas system and ignores its power loss and flow loss.

[0084] In this embodiment, it is assumed that there is no power loss or energy loss at the natural gas mixing node; in addition, the power system is a high-quality energy source, and the medium mixing node is not considered; therefore, the following analysis mainly focuses on the energy-energy-energy multi-flow mechanism modeling of the medium mixing node in the supply and return water network of the heating system.

[0085] S401, Energy Flow Mechanism Model of Medium Mixing Nodes: For the supply and return water network of the heating system, the water flow at the outlet of different pipe sections mixes, and the temperature after mixing is determined by the outlet temperatures of all pipe sections before mixing. The outlet temperature at the end of the pipe section is calculated by the temperature drop equation (34): (34); In the formula: and It is the temperature (K) at the beginning and end nodes of the pipe section; It is the ambient temperature (K); It is the overall heat transfer coefficient per unit length of the pipe section (W·m). -1 K -1 The ambient temperature is known and given, depending on the actual local temperature. The overall heat transfer coefficient per unit length of the pipe section is obtained by consulting relevant data. L is the pipe section length (m). This is the mass flow rate (kg / s) of the pipe section. (Specified) , , Then equation (34) can be expressed as equation (35): (35); If the heat medium flows into a node through multiple pipe sections, the node is a hydraulic junction, also known as a mixing node.

[0086] The temperature of the heat medium flowing out of this node is expressed as the temperature at which the heat medium from multiple pipe sections converges, calculated as shown in equations (36) and (37): (36); (37); In the formula: It is the temperature of the heat transfer medium at the mixing node; It represents the temperature of the heat transfer medium flowing into the end of each pipe section at this node, all in K. It is the mass flow rate of each pipe segment at the outflow node; It represents the mass flow rate of each pipe segment flowing into this node, with units of kg / s.

[0087] Regulation , , According to equation (36), equation (37) can be expressed as equation (38): (38); According to the first law of thermodynamics, the total energy is conserved before and after mixing, as calculated in equation (39): (39); In the formula: This is the sum of the power at the beginning of all pipe segments flowing out of the mixing node; This represents the sum of the end power of all pipe segments flowing into the node before mixing, in kW.

[0088] S402, Medium Mixing Node Flow Mechanism Model: According to the second law of thermodynamics, the mixing process of water in the supply and return water network of a thermal system is a typical irreversible process, accompanied by energy loss. At the mixing node, although the total energy remains unchanged before and after mixing, the high-temperature heat contained in the inflowing high-temperature fluid is partially degraded to γ ​​during the heating of the low-temperature fluid, resulting in a decrease in the system's total work capacity after mixing. This loss of work capacity is the mixing energy loss at the mixing node.

[0089] Mixed loss It equals the difference between the sum of the flow at the ends of all pipe sections flowing into the mixing node before mixing and the sum of the flow at the beginning of all pipe sections flowing out of the mixing node after mixing.

[0090] Taking the medium mixing node in the supply and return water network as an example, see Figure 7 The mixed loss is calculated as shown in equation (40): (40); In the formula: It is the sum of the flow at the ends of all pipe segments flowing into the node before mixing; The sum of the flow rates at the beginning of all pipe sections flowing out of the node after mixing is given in kW. As can be seen from equation (40), the greater the temperature difference between the ends of each pipe section on the inflow side, the greater the mixing loss.

[0091] Before mixing, the energy quality coefficients (EMCs) of the thermal energy at the ends of the pipe sections flowing into the mixing node are different; after mixing, the EMCs of the thermal energy at the beginning of the pipe sections flowing out of the mixing node are the same. To facilitate the evaluation of the quality of thermal energy at the inflow and outflow ends, it is necessary to calculate the average EMC of the thermal energy at the inflow and outflow ends. The specific calculation is as follows: (41); In the formula: , These represent the average energy quality coefficients at the inflow and outflow ends of the medium mixing node, respectively. Since the medium mixing process is irreversible, the energy quality at the outflow end is lower than that at the inflow end. The first formula in equation (41) describes the average energy quality coefficient at the inflow end as equal to the ratio of total inflow current to total inflow power; the second formula describes the average energy quality coefficient at the outflow end as equal to the ratio of total outflow current to total outflow power.

[0092] S403, Medium Mixing Node Flow Mechanism Model: The high-temperature heat flowing into the mixing node degrades to ℃ during the mixing process and is transferred to the outflow side. The increase in ℃ during this process is called the mixing ℃ increase.

[0093] The mixing flow rate is equal to the difference between the sum of the flow rates at the beginning of all pipe sections flowing out of the mixing node after mixing and the sum of the flow rates at the end of all pipe sections flowing into the mixing node before mixing.

[0094] Taking the medium mixing node in the supply and return water network as an example, see Figure 8 The mixed addition calculation is as shown in equation (42): (42); In the formula: For mixed increase; It is the sum of the flow at the ends of all pipe sections before the mixing node of the medium flowing into the mixture; This represents the sum of the flow rates at the beginning of all pipe sections at the mixing node after mixing, all in kW. The mixing loss is numerically equal to the mixing gain.

[0095] To eliminate the interference of the dielectric mixing scale on the quantization of the energy quality degradation at the inflow end, this embodiment defines the energy quality degradation rate of the dielectric mixing node, which is calculated as follows: (43); In the formula: This represents the energy quality degradation rate at the media mixing node. The above formula describes the ratio of the energy degradation rate at the end of all pipe segments flowing into the media mixing node before media mixing to the sum of the energy at the end of the media mixing node.

[0096] As can be seen from equations (39)-(42), the mixing increase can accurately quantify the degree of energy quality decay on the inflow side during the mixing process of the medium mixing node, and is also the essential manifestation of the decrease in the system's ability to perform work after mixing.

[0097] Example 2 This embodiment provides supplementary explanations to the above-mentioned modeling method for the energy-energy-energy multi-flow mechanism of integrated energy systems, based on specific applications and data, as follows: This embodiment selects a typical regional integrated energy system construction case for analysis. The system consists of three independent subsystems coupled together: electricity, natural gas, and heat, achieving multi-energy coupling through two energy stations, ES1 and ES2. The natural gas system has a 5-node structure. The gas source pressure is 5 bar, and the calorific value of the natural gas is 45.574 MJ / m³. 3The theoretical combustion temperature reaches 1973℃. The thermal system adopts an 8-node model with dual heat sources. The supply water temperature is uniformly 100℃, and the load outlet temperature is uniformly 50℃. The heat generation power of heat source H2 is 700 kW. The power system is constructed based on a simplified IEEE 33-node distribution network with a source-end voltage of 10.5kV. The system's common ambient temperature is set at 25℃. ES1 includes CHP and GB, where CHP's gas-to-electricity and gas-to-heat generation efficiencies are 30% and 40%, respectively, and GB1's efficiency is 85%. The natural gas allocation coefficient for CHP is 0.5. ES1 adjusts power generation according to heat load demand and connects to the power system nodes accordingly. E 6. Natural Gas Load Nodes G 6 and heat source nodes H 1. ES2 includes EB and GB2, where EB has an efficiency of 95% and GB2 has an efficiency of 85%, and EB and GB2 are specified to have the same heat generation. ES2 connects to the power load node. E 5. Natural Gas Load Nodes G 7 and heat source nodes H 2. See the example structure diagram and energy station structure diagram. Figure 9 and Figure 10 The parameters of each integrated energy system line (pipeline) are shown in Tables 1-3, and the nodes and load power of each integrated energy system are shown in Tables 4-6.

[0098] Table 1 Power line parameters Table 2 Natural Gas Pipeline Parameters Table 3 Parameters of Thermal Pipelines Table 4 Electrical Load Power Table 5 Natural Gas Load Power Table 6 Heat Load Power The specific calculations are as follows, based on the multi-flow mechanism modeling method for integrated energy systems proposed in this invention.

[0099] Taking ES2 as an example, energy-current-current multi-flow calculations were performed. The specific energy flow calculation results are as follows: like Figure 11As shown, the power loss of ES2 is 80.1858 kW. Based on the efficiency parameters of EB and GB2, the power loss of EB is 18.4211 kW, and the power loss of GB2 is 61.7647 kW. The electrical power provided by the electro-thermal coupling node E5 is 373.4665 kW, of which 368.4211 kW is input to the EB unit and 5.0454 kW is supplied to CP2. The heat power flowing into the internal node O2 of ES2 includes the output heat power of EB (350 kW) and the output heat power of GB2 (350 kW). The total heat power flowing into the internal node O2 of ES2 is equal to the output heat power of ES2, which is 700 kW. The power loss of ES2 is 553.6851 kW. The emission loss of EB in ES2 is 13.5668kW, the emission loss of EB is 4.8543kW, the emission loss of GB2 is 40.0484kW, and the emission loss of GB2 is 21.7163kW. Calculated using formulas (24) and (25), the emission loss of ES2 is 53.6152kW, and the emission loss of ES2 is 26.5706kW.

[0100] like Figure 12 As shown, since EB and GB2 have the same heat generation, their output heat capacity is also the same, both being 49.6174 kW. Calculated using formula (3), the heat loss of EB is 318.8037 kW, and the heat loss of GB2 is 234.8814 kW. Calculated using formula (9), the energy quality degradation within EB causes a depreciation of 300.3826 kW of input heat capacity, and the energy quality degradation within GB2 causes a depreciation of 173.1167 kW of input heat capacity. The electrical energy consumed by CP2 is 5.0454 kW. The heat capacity flowing into node O2 inside ES2 is 49.6174 kW of output heat capacity from EB and 49.6174 kW of output heat capacity from GB2. The total heat capacity flowing into node O2 inside ES2 is equal to the output heat capacity of ES2, which is 99.2348 kW.

[0101] like Figure 13As shown, the heat gain of ES2 is calculated to be 473.4993kW based on the heat generation mechanism model of the energy station. Since the heat generation of EB and GB2 is the same, it can be known that the heat output heat gain of EB and GB2 is the same, both being 300.3862kW. From formula (28), it can be calculated that the heat gain of EB is 300.3826kW and the heat gain of GB is 173.1167kW. The heat gain flowing into the internal node O2 of ES2 is 300.3862kW output heat gain of EB and 300.3862kW output heat gain of GB1. The total heat gain flowing into the internal node O2 of ES2 is equal to the heat output heat gain of ES2, which is 600.7652kW. Wherein O2 refers to a node inside the energy station ES2. The internal node of ES is the convergence point of the multiple flow of energy-heat-heat output from various components inside ES. No irreversible process leading to heat loss or heat gain occurs at the internal node. Irreversible processes leading to power loss or power increase occur in various components within the ES. Based on the physical characteristics of the internal nodes of the ES, it is known that these nodes perform the function of energy-power-power convergence and distribution.

[0102] Pipeline branch energy-type multi-flow calculation as follows Figures 14 to 16 As shown, the power loss of LH4 is the difference between the power at the beginning of LH4 and the power at the end of LH4. Here, the power at the end of LH4 represents the power at the end of LH4 before mixing. The discharge loss of LH4 is the difference between the current at the beginning of LH4 and the current at the end of LH4. Here, the current power at the end of LH4 represents the current at the end of LH4 before mixing. The discharge loss of LH4 is the difference between the current at the beginning of LH4 and the current at the end of LH4. Here, the current at the end of LH4 represents the current at the end of LH4 before mixing.

[0103] The energy-temperature-temperature multi-flow calculation for a mixed-medium node includes three mixed-medium nodes: supply node 5, return node 3, and return node 4. This embodiment uses supply node 5 as an example to perform energy-temperature-temperature multi-flow analysis and calculation, as detailed below.

[0104] Energy flow calculation at mixed media nodes, such as Figure 17 As shown, the media in water supply pipes lh3, lh4, and lh5 mix at water supply node 5. Based on the energy flow mechanism model of the media mixing node, the calculated power at the end of water supply pipe lh3 is 185.014 kW, the power at the end of water supply pipe lh4 is 227.369 kW, and the power at the end of water supply pipe lh5 is 1034.986 kW. Before mixing, the sum of the power at the ends of all pipe segments flowing into water supply node 5 is 1447.369 kW. The power at the beginning of water supply pipe lh8 is 1447.369 kW. After mixing, the sum of the power at the beginning of all pipe segments flowing out of water supply node 5 is 1447.369 kW. Therefore, the sum of the power at the ends of all pipe segments flowing into water supply node 5 before mixing is equal to the sum of the power at the beginning of all pipe segments flowing out of water supply node 5 after mixing, and the total energy is conserved before and after mixing.

[0105] Medium mixing node flow calculation Figure 18 As shown, based on the crossflow mechanism model of the media mixing node, the calculated crossflow at the end of water supply pipe lh3 is 19.0274 kW, the crossflow at the end of water supply pipe lh4 is 23.5048 kW, and the crossflow at the end of water supply pipe lh5 is 110.9510 kW. The sum of the crossflows at the ends of all pipe segments flowing into water supply node 5 before mixing is 153.4832 kW. The crossflow at the beginning of water supply pipe lh8 is 1447.369 kW. The sum of the crossflows at the beginning of all pipe segments flowing out of water supply node 5 after mixing is 153.4361 kW. Therefore, the mixing crossflow loss is the difference between the sum of the crossflows at the ends of all pipe segments flowing into water supply node 5 before mixing and the sum of the crossflows at the beginning of all pipe segments flowing out of water supply node 5 after mixing, which is equal to 0.0471 kW.

[0106] Medium mixing node flow calculation as follows Figure 19 As shown, based on the medium mixing node flow mechanism model, the calculated flow at the end of water supply pipe lh3 is 165.9866 kW, the flow at the end of water supply pipe lh4 is 203.8645 kW, and the flow at the end of water supply pipe lh5 is 923.0438 kW. The sum of the flow at the ends of all pipe sections flowing into water supply node 5 before mixing is 1293.8859 kW. The flow at the beginning of water supply pipe lh8 is 1293.9330 kW. The sum of the flow at the beginning of all pipe sections flowing out of water supply node 5 after mixing is 1293.9330 kW. Therefore, the mixing flow is the difference between the sum of the flow at the beginning of all pipe sections flowing out of water supply node 5 after mixing and the sum of the flow at the ends of all pipe sections flowing into water supply node 5 before mixing, which is equal to 0.0471 kW.

[0107] Example 3 Based on the same inventive concept, this application also provides a multi-flow mechanism modeling device for integrated energy systems, which can be used to implement the method described in the above embodiments, specifically including the following: The component mechanism module is used to establish a multi-flow mechanism model of energy, power, and energy of components in an integrated energy system. Based on the input and output relationship of energy flow and power flow of the components, it calculates the power loss and power loss of the components, and calculates the power increase of the components based on the increase of power during the internal energy conversion process. The energy station mechanism module is used to establish a multi-flow mechanism model of energy stations in an integrated energy system, which aggregates the power loss, emission loss and emission of each component in the energy station, and calculates the overall power loss, emission loss and emission increase of the energy station. The medium mixing node mechanism module is used to establish an energy-energy-energy multi-flow mechanism model for medium mixing nodes in an integrated energy system. Based on the laws of thermodynamics, it calculates the total energy conservation relationship before and after medium mixing, mixing energy loss, and mixing energy increase generated by the depreciation of high-temperature heat energy on the inflow side during the mixing process. The pipeline branch mechanism module is used to establish a multi-flow mechanism model of energy-energy-energy in pipeline branches in an integrated energy system, and to calculate the power loss, emission energy loss and emission energy of pipeline branches to characterize the multi-flow emission characteristics of pipeline branches in the energy transmission process. The integrated mechanism module is used to reveal the sources and components of power loss, energy loss and energy increase in the entire integrated energy system based on the energy-energy-energy multi-flow mechanism model of the components, energy stations, medium mixing nodes and pipeline branches, and to determine the mapping relationship between the decline in the integrated energy system's work capacity and the degradation of energy quality.

[0108] Preferably, embodiments of this application also provide a specific implementation of an electronic device capable of implementing all steps in the integrated energy system energy-flow-flow multi-flow mechanism modeling method described in the above embodiments. The electronic device specifically includes the following: Processor, memory, communications interface, and bus; The processor, memory, and communication interface communicate with each other via a bus; the communication interface is used to realize information transmission between server-side devices, metering devices, and user-side devices.

[0109] The processor is used to call the computer program in the memory. When the processor executes the computer program, it implements all the steps in the integrated energy system energy-flow multi-flow mechanism modeling method in the above embodiments.

[0110] Embodiments of this application also provide a computer-readable storage medium capable of implementing all steps of the integrated energy system energy-current multi-flow mechanism modeling method in the above embodiments. The computer-readable storage medium stores a computer program, which, when executed by a processor, implements all steps of the integrated energy system energy-current multi-flow mechanism modeling method in the above embodiments. The computer-readable storage medium may be a disk, optical disk, read-only memory, random access memory, flash memory, portable hard disk, solid-state hard disk, or other tangible storage medium capable of storing program code and being read and executed by a processor.

[0111] The various embodiments in this specification are described in a progressive manner. Similar or identical parts between embodiments can be referred to interchangeably. Each embodiment focuses on its differences from other embodiments. In particular, hardware + program embodiments are relatively simple in description because they are fundamentally similar to method embodiments; relevant parts can be referred to the descriptions in the method embodiments.

[0112] The foregoing has described specific embodiments of this specification. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recited in the claims may be performed in a different order than that shown in the embodiments and may still achieve the desired result. Furthermore, the processes depicted in the drawings do not necessarily require the specific or sequential order shown to achieve the desired result. In some embodiments, multitasking and parallel processing are possible or may be advantageous.

[0113] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0114] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0115] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0116] This invention is not limited to the embodiments described above. The above description of specific embodiments is intended to illustrate and explain the technical solutions of this invention. The specific embodiments described above are merely illustrative and not restrictive. Without departing from the spirit and scope of the claims, those skilled in the art can make many specific modifications based on the teachings of this invention, and these modifications all fall within the scope of protection of this invention.

Claims

1. A method for modeling energy-mass-matter multi-flow mechanism of integrated energy system, characterized in that, include: S1. Establish a multi-flow mechanism model of energy-energy-energy in the components of the integrated energy system. Based on the input and output relationship of energy flow and energy flow of the components, calculate the power loss and energy loss of the components, and calculate the energy increase of the components based on the increase of energy during the internal energy conversion process. S2. Establish a multi-flow mechanism model of energy station in integrated energy system, aggregate the power loss, emission loss and emission of each component in the energy station, and calculate the overall power loss, emission loss and emission increase of the energy station. S3. Establish a multi-flow mechanism model of energy-energy-energy at the medium mixing node in the integrated energy system. Based on the laws of thermodynamics, calculate the total energy conservation relationship before and after medium mixing, the mixing energy loss, and the mixing energy increase generated by the depreciation of high-temperature heat energy on the inflow side during the mixing process. S4. Establish a multi-flow mechanism model of energy-energy-energy in pipeline branches in an integrated energy system, calculate the power loss, emission energy loss and emission energy of pipeline branches, so as to characterize the multi-flow emission characteristics of pipeline branches in the energy transmission process. S5. Based on the energy-energy-energy multi-flow mechanism model of the aforementioned components, energy stations, medium mixing nodes, and pipeline branches, the source composition of power loss, energy loss, and energy increase in the entire process of the integrated energy system is revealed, and the mapping relationship between the decline in the integrated energy system's work capacity and the degradation of energy quality is determined.

2. The method of claim 1, wherein the method is characterized by, In step S1, the components are divided into a first category of components with an energy conversion efficiency of less than 1 and a second category of components with an energy conversion efficiency of greater than 1, and modeled accordingly: For the first category of components, their losses include three parts: emission losses, emission energy, and the depreciation of some input energy caused by internal energy quality degradation; For the second category of components, their losses are quantified as the depreciation of some external driving energy during the process of improving the energy quality of the input end by high-quality external driving energy; The first category of components includes cogeneration, gas boilers, electric boilers, and transformers; The second category of components includes heat pumps, electric chillers, and absorption chillers.

3. The method of claim 2, wherein the method is characterized by, The power loss of a first-class component is equal to the difference between the total input power and the total output power of the component; The increase in ν during the energy conversion process within the first type of element is equal to the difference between the total output ν current and the total input ν current of the first type of element.

4. The method of claim 1, wherein the method is characterized by, In step S2, the power loss of the energy station is equal to the difference between the total input power and the total output power of the energy station; Energy station losses include three parts: energy station emission losses, energy station emissions, and the depreciation of some input energy caused by the degradation of energy quality within the energy station. The energy station voltage increase is defined as the increase in voltage during the energy conversion process within the energy station. Its value is equal to the difference between the total output voltage and the total input voltage of the energy station, and is also equal to the sum of the voltage increases of all components in the energy station.

5. The method of claim 1, wherein the method is characterized by, In step S3, the mixing loss is equal to the difference between the sum of the end flows of all pipe segments flowing into the mixing node before mixing and the sum of the beginning flows of all pipe segments flowing out of the mixing node after mixing; the mixing gain is equal to the difference between the sum of the beginning flows of all pipe segments flowing out of the mixing node after mixing and the sum of the end flows of all pipe segments flowing into the mixing node before mixing, and the mixing loss is numerically equal to the mixing gain.

6. The method of claim 1, wherein the method is characterized by, In step S4, for the branch of the heating system pipeline, the discharge loss of the supply and return water pipelines refers to the energy in the power loss of the supply and return water pipelines that theoretically still has the ability to do work; the discharge loss of the supply and return water pipelines refers to the energy in the power loss of the supply and return water pipelines that theoretically cannot do work at all. The power loss of its supply and return water pipes is heat loss, that is, the supply and return water pipes dissipate heat to the environment.

7. An integrated energy system energy-mass-flow-mechanism modeling device, characterized in that, include: The component mechanism module is used to establish a multi-flow mechanism model of energy, power, and energy of components in an integrated energy system. Based on the input and output relationship of energy flow and power flow of the components, it calculates the power loss and power loss of the components, and calculates the power increase of the components based on the increase of power during the internal energy conversion process. The energy station mechanism module is used to establish a multi-flow mechanism model of energy stations in an integrated energy system, which aggregates the power loss, emission loss and emission of each component in the energy station, and calculates the overall power loss, emission loss and emission increase of the energy station. The medium mixing node mechanism module is used to establish an energy-energy-energy multi-flow mechanism model for medium mixing nodes in an integrated energy system. Based on the laws of thermodynamics, it calculates the total energy conservation relationship before and after medium mixing, mixing energy loss, and mixing energy increase generated by the depreciation of high-temperature heat energy on the inflow side during the mixing process. The pipeline branch mechanism module is used to establish a multi-flow mechanism model of energy-energy-energy in pipeline branches in an integrated energy system, and to calculate the power loss, emission energy loss and emission energy of pipeline branches to characterize the multi-flow emission characteristics of pipeline branches in the energy transmission process. The integrated mechanism module is used to reveal the sources and components of power loss, energy loss and energy increase in the entire integrated energy system based on the energy-energy-energy multi-flow mechanism model of the components, energy stations, medium mixing nodes and pipeline branches, and to determine the mapping relationship between the decline in the integrated energy system's work capacity and the degradation of energy quality.

8. An electronic device comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the steps of the integrated energy system energy-flow multi-flow mechanism modeling method according to any one of claims 1 to 6.

9. A computer readable storage medium having stored thereon a computer program, characterized in that, When executed by a processor, the computer program implements the steps of the integrated energy system energy-flow multi-flow mechanism modeling method according to any one of claims 1 to 6.

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