A method for constructing an integrated energy system

Abstract

The application discloses a kind of comprehensive energy system construction methods, belong to energy system construction field.Generalized structure is included in the construction comprehensive energy system;Generalized structure is divided into four mutually connected, mutually coupled subsystems, subsystem includes gas tri-generation subsystem, heating subsystem, cooling subsystem and electronic supply system;Based on the size of heat load, cooling load and electric load calculated, according to external environmental conditions and resource conditions, gradually filter out the required subsystem, and the required energy supply equipment in subsystem;According to the selected subsystem, set the optimal operation mode of subsystem;The capacity of each device in subsystem is optimized, and the final multi-energy supply system scheme is determined.The application is applied to energy system construction aspect, and the technical problem to be solved is to select and construct comprehensive energy system in various energy supply equipment, while coupling the optimization of operation strategy during system design.

Description

Technical Field

[0001] This invention belongs to the field of energy system construction, and in particular relates to a method for constructing an integrated energy system. Background Technology

[0002] Integrated energy systems can achieve comprehensive management and economic dispatch of energy flows such as cooling, electricity, heat, and gas, thereby achieving the effects of multi-energy complementarity, cascaded energy utilization, and energy conservation and emission reduction. Integrated smart energy has significant application value for promoting energy conservation and emission reduction in regional industrial parks, regional energy planning, and the large-scale utilization of renewable energy. However, there are many energy supply devices that can be selected for integrated energy systems. For example, heating equipment can include coal-fired boilers, gas-fired boilers, biomass boilers, solar collectors, air source heat pumps, soil source heat pumps, and water source heat pumps. In addition, gas-fired combined heat and power (CHP) systems can also be selected. At the same time, the coupling relationships between various devices are complex. For example, various heat pumps can handle both heat loads and cooling loads. For example, a gas-fired CHP system can drive a waste heat boiler to produce hot water for heating and also drive an absorption chiller for cooling.

[0003] There are already publicly available technologies for the design optimization of a specific multi-energy supply system. For example, Chinese Patent Publication No. CN115907139A discloses a collaborative scheduling method for a multi-energy supply system. The system includes equipment such as a gas internal combustion engine, absorption chiller, photovoltaic, solar thermal, ground source heat pump, gas boiler, storage battery and water tank, and takes annual cost, primary energy consumption and carbon dioxide emissions as optimization targets.

[0004] However, the aforementioned energy supply system composition is fixed and does not consider other system components. When a device in the system is unsuitable, the technology cannot be applied. Furthermore, current integrated energy system design solutions typically only consider two operating strategies: "heat-driven power generation" and "electricity-driven heat generation." This approach is overly simplistic and often leads to energy waste in practical situations. Summary of the Invention

[0005] In view of the shortcomings of the existing technology, the technical problem to be solved by the present invention is to select and build an integrated energy system from a variety of energy supply devices, and at the same time, to optimize the operation strategy during system design. The present invention proposes an integrated energy system construction method that provides a variety of options for the selection of multi-energy supply systems in actual projects, rather than being limited to a certain system configuration scheme.

[0006] To solve the aforementioned technical problem, the technical solution adopted by the present invention is as follows: This invention provides a method for constructing an integrated energy system, comprising the following steps: S1: Construct a comprehensive energy system with a broad structure that takes into account all forms of energy supply equipment, energy conversion equipment, and users; S2: The generalized structure is divided into four interconnected and coupled subsystems, including a gas tri-generation subsystem, a heating subsystem, a cooling subsystem, and an electronic power supply system; S3: Calculate the user's heat load, cooling load, and electrical load respectively; S4: Based on the calculated heat load, cooling load and electrical load of the user, the required subsystems and the required energy supply equipment in the subsystems are gradually selected according to the external environmental conditions and resource conditions; S5: Based on the selected subsystem, set the optimal operating mode of the subsystem; S6: Optimize the capacity of each device in the subsystem to determine the final multi-energy power supply system scheme.

[0007] Preferably, the generalized structure in S1 takes the heating and distribution center, the cooling and distribution center, and the power supply and distribution center as the three major hubs of the system.

[0008] Preferably, the input end of the heating distribution center includes a gas-fired combined heat and power system, a coal-fired boiler, a gas-fired boiler, a biomass boiler, a heat storage device, a solar collector, an air source heat pump, a ground source heat pump, a water source heat pump, and industrial waste heat, while the output end consists of the heat storage device and heat users; the input end of the cooling distribution center includes a gas-fired combined heat and power system, an air source heat pump, a ground source heat pump, a water source heat pump, an electric chiller, an absorption chiller driven by a high-temperature heat source, and a cold storage device, while the output end consists of the cold storage device and cold users; the input end of the power distribution center includes a gas-fired combined heat and power system, a photovoltaic power station, a wind power station, an energy storage device, and a power grid, while the output end includes an air source heat pump, a ground source heat pump, a water source heat pump, an electric chiller, an energy storage device, and electricity users.

[0009] Preferably, the gas-fired combined heat and power subsystem in S2 uses natural gas as fuel, and generates electricity by combustion to drive a generator. At the same time, the waste heat of the flue gas can be used for heating in winter through a flue gas / water heat exchanger, and can drive a waste heat boiler and an absorption chiller for cooling in summer. The heating subsystem includes all heating methods except for providing heat energy from the waste heat of the gas turbine flue gas. The equipment mainly includes solar collectors, air source heat pumps, water source heat pumps, soil source heat pumps, coal-fired boilers, gas-fired boilers, and water tanks. The solar collectors are connected to the water tanks separately. When the heat generated is sufficient, it is directly supplied to the heat users. When the heat is insufficient, it serves as the inlet of other heating equipment for further heating, thereby meeting the heating requirements. The cooling subsystem includes all cooling methods except for the cooling energy generated by the absorption chiller driven by the waste heat of the gas turbine flue gas. The equipment mainly includes air source heat pumps, ground source heat pumps, water source heat pumps, electric chillers, and cooling energy generated by absorption chillers driven by other high-temperature heat sources. The equipment is connected in parallel to share the cooling load. The power supply system includes power supply methods other than gas turbine power generation, and the equipment includes wind turbines, photovoltaics, transformers, controllers and batteries.

[0010] Preferably, in step S3, the load is calculated based on the user's heating, cooling, and electricity consumption indicators, or the dynamic load for the whole year is calculated according to building environment simulation analysis software, and the maximum heat load for the whole year is denoted as Q. H The maximum cooling load is denoted as Q. C The maximum electrical load is denoted as Q. E All units are in kW.

[0011] Preferably, in step S4, firstly, based on the user's actual needs and local resource conditions, it is determined whether to select the gas tri-generation subsystem. If the gas tri-generation subsystem is selected, the maximum load values ​​corresponding to the three types of loads are compared, Q. H Q C and Q E The corresponding gas turbine capacities are denoted as P. HT P CT and P ET According to Q H Q C and Q E The relative sizes of the three components, and whether or not to select the aforementioned gas tri-generation sub-supply system.

[0012] Preferably, all cases are divided into Case 1, Case 2, Case 3, Case 4, Case 5, and Case 6; Case 1 selects the aforementioned gas tri-generation subsystem and Q H Minimum; Case 2: Select the aforementioned gas-fired combined cooling, heating, and power (CCHP) subsystem and Q C Minimum; Case 3: Select the aforementioned gas-fired combined cooling, heating, and power (CCHP) subsystem and Q E H And Q HR CR Case 4: Select the aforementioned combined gas supply, combined cooling, heating, and power (CCHP) subsystem and Q E C And Q CR HR Case 5: Do not select the aforementioned gas-fired combined cooling, heating, and power (CCHP) subsystem and Q H C Case 6: Do not select the aforementioned gas-fired combined cooling, heating, and power (CCHP) subsystem and Q C H .​​​​​​

[0013] Preferably, for case one, the maximum heat load is minimized, with P HT As the actual capacity of the gas turbine, the heat load is entirely borne by the gas turbine, while the electrical and cooling loads are supplemented by other equipment. The electrical and cooling loads supplemented by other equipment are obtained by calculating the maximum electrical and cooling loads remaining after the gas turbine has borne the load, and the system composition of the cooling subsystem and the electrical system is selected accordingly. In scenario two, the maximum cooling load is minimized, with P CT As the actual capacity of the gas turbine, the remaining maximum electrical load and maximum thermal load are calculated respectively, and the system composition of the heating subsystem and the power supply subsystem is selected accordingly. In case three, the maximum electrical load is the minimum, with P ET As the actual capacity of the gas turbine, the remaining maximum heat load Q HR Less than the remaining maximum cooling load Q CR The heating subsystem is selected based on the remaining maximum heat load, and the remaining cooling load is supplemented by a separate cooling subsystem. For scenario four, the maximum electrical load is minimized, PET is taken as the actual capacity of the gas turbine, and the remaining maximum cooling load Q is... CR Less than the remaining maximum heat load Q HR Therefore, the heating subsystem is selected based on the remaining maximum cooling load, and the remaining heat load is then supplemented by a separate cooling subsystem. For scenario five, if the gas turbine combined cooling, heating, and power supply subsystem is not selected and the maximum heat load is relatively small, the heating subsystem should be selected first, and the remaining cooling load should be supplemented by the cooling subsystem, while the power supply subsystem can be selected separately. For scenario six, if the gas turbine combined cooling, heating, and power (CCHP) subsystem is not selected and the maximum cooling load is relatively small, the cooling subsystem should be selected first, and the remaining heat load should be supplemented by the heating subsystem. The power supply subsystem can be selected separately.

[0014] Preferably, in step S5, the priority order of operation of each device is set according to the level of operating costs.

[0015] Preferably, in step S5, the constructed multi-source energy supply system is first built in the TRNSYS simulation platform, and each device module is set up and connected in the simulation platform; then, according to the operating mode selected in step S5, the settings are made in the simulation platform; finally, with the lowest annual cost as the optimization objective function, the capacity of each device is optimized by the genetic optimization algorithm built into the TRNSYS simulation platform, thereby obtaining the optimal system configuration.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention provides a method for constructing an integrated energy system. First, it provides a generalized structure for the integrated energy system, which includes as many energy supply devices, energy consumption devices, and energy conversion devices as possible, and establishes the coupling relationship between the devices. Therefore, based on this generalized structure, the optimal system equipment configuration can be selected according to local conditions. This technical solution provides a variety of options for the selection of multi-energy supply systems in actual projects, rather than being limited to a single system configuration. Furthermore, this invention divides all energy supply equipment in the generalized structure of the integrated energy system into four mutually coupled subsystems, and provides a standard for the selection of each subsystem in actual projects. Finally, it sets the operating sequence of all equipment in each subsystem, establishes a transient calculation model, and optimizes the capacity of each equipment in the system through a genetic optimization algorithm. The technical solution of this invention can provide as many technical solutions as possible, while setting the selection of each subsystem and the priority order of each device operation. Furthermore, the capacity of each device is optimized through optimization algorithms. Therefore, the system capacity configuration can be minimized and the system investment can be reduced. At the same time, this method avoids low-load operation of equipment, thus achieving the effect of energy saving. Attached Figure Description

[0017] Figure 1 A generalized structural diagram of an integrated energy system; Figure 2 This is a schematic diagram of a combined gas supply, combined cooling, heating, and power (CCHP) subsystem. Figure 3 This is a schematic diagram of the heating subsystem; Figure 4 Schematic diagram of the cooling subsystem; Figure 5 This is a schematic diagram of the electronic system. Figure 6 This represents a user's dynamic cooling, heating, and electrical load for the entire year. Detailed Implementation

[0018] The technical solutions in specific embodiments of the present invention will now be described in detail and completely with reference to the accompanying drawings. Obviously, the described embodiments are merely some specific implementations of the overall technical solution of the present invention, and not all implementations. Based on the overall concept of the present invention, all other embodiments obtained by those skilled in the art fall within the protection scope of the present invention.

[0019] This invention provides a method for constructing an integrated energy system, comprising the following steps: S1: Construct a comprehensive energy system with a broad structure that takes into account all forms of energy supply equipment, energy conversion equipment, and users; S2: The generalized structure is divided into four interconnected and coupled subsystems, including a gas tri-generation subsystem, a heating subsystem, a cooling subsystem, and an electronic power supply system; S3: Calculate the user's heat load, cooling load, and electrical load respectively; S4: Based on the calculated heat load, cooling load and electrical load of the user, the required subsystems and the required energy supply equipment in the subsystems are gradually selected according to the external environmental conditions and resource conditions; S5: Based on the selected subsystem, set the optimal operating mode of the subsystem; S6: Optimize the capacity of each device in the subsystem to determine the final multi-energy power supply system scheme.

[0020] This invention provides a design method for a multi-energy supply system based on a comprehensive energy generalized structure, in order to solve the problem of the lack of a reasonable construction method for comprehensive energy systems. Specifically, the above technical solution provides a method for constructing an integrated energy system. Firstly, it provides a generalized structure for the integrated energy system, which includes as many energy supply devices, energy consumption devices, and energy conversion devices as possible, and establishes coupling relationships between these devices. Therefore, based on this generalized structure, the optimal system equipment configuration can be selected according to local conditions. This technical solution provides diverse options for selecting multi-energy supply systems in practical projects, rather than being limited to a single system configuration. Furthermore, this invention divides all energy supply devices in the generalized structure of the integrated energy system into four mutually coupled subsystems, and provides standards for selecting each subsystem in practical projects. Finally, it sets the operating sequence of all devices in each subsystem and establishes a transient calculation model, using a genetic optimization algorithm to optimize the capacity of each device in the system. This technical solution not only provides as many technical options as possible, but also sets the selection of each subsystem and the priority order of each device's operation, and optimizes the capacity of each device through an optimization algorithm. Therefore, it can minimize the system's capacity configuration and reduce system investment. At the same time, this method avoids low-load operation of equipment, achieving energy-saving effects. Regarding step S4, existing integrated energy supply systems typically employ two modes: "heat-driven power generation" and "electricity-driven heat generation." However, neither of these modes considers cooling load. This proposal suggests three modes: "heat-driven capacity generation," "cooling-driven capacity generation," and "electricity-driven capacity generation." Since the gas turbine combined cycle power (CCHP) system can simultaneously meet three types of loads, if this subsystem is selected, it will prioritize meeting all types of loads, with any unmet load demands supplemented by other subsystems.

[0021] In a preferred embodiment, such as Figure 1As shown, the generalized structure in S1 has three major hubs: a heating distribution center, a cooling distribution center, and a power distribution center. Further, the input end of the heating distribution center includes a gas-fired combined heat and power (CHP) system, a coal-fired boiler, a gas-fired boiler, a biomass boiler, thermal storage equipment, solar collectors, air-source heat pumps, ground-source heat pumps, water-source heat pumps, and industrial waste heat; the output end is the thermal storage equipment and heat users. The input end of the cooling distribution center includes a gas-fired CHP system, an air-source heat pump, a ground-source heat pump, a water-source heat pump, an electric chiller, an absorption chiller driven by a high-temperature heat source, and cold storage equipment; the output end is the cold storage equipment and cold users. The input end of the power distribution center includes a gas-fired CHP system, a photovoltaic power station, a wind power station, energy storage equipment, and the power grid; the output end includes an air-source heat pump, a ground-source heat pump, a water-source heat pump, an electric chiller, energy storage equipment, and electricity users. This generalized structure takes into account as many different types of energy supply devices as possible and couples these devices together, thus providing a variety of integrated energy system composition schemes.

[0022] In a preferred embodiment, in step S2, the generalized structure of integrated energy is divided. Due to the special nature and complexity of the combined gas supply, combined heating, and power (CHP) system, CHP is treated as a separate subsystem. Specifically, as follows... Figure 2 As shown, the gas-fired combined heat and power (CHP) subsystem in S2 uses natural gas as fuel, which drives a generator to produce electricity through combustion. Simultaneously, the waste heat from the flue gas can be used for heating in winter through a flue gas / water heat exchanger, and for cooling in summer by driving a waste heat boiler and an absorption chiller. Figure 3 As shown, the heating subsystem includes all heating methods except for providing heat energy from the waste heat of the gas turbine flue gas. The equipment mainly includes solar collectors, air-source heat pumps, water-source heat pumps, ground-source heat pumps, coal-fired boilers, gas-fired boilers, and water tanks. Due to the instability of solar collector heating, the solar collectors are connected separately to the water tanks. When sufficient heat is generated, it is directly supplied to heat users; when insufficient heat is generated, it serves as the inlet for further heating of other heating equipment to meet the heating requirements. Figure 4 As shown, the cooling subsystem includes all cooling methods except for the cooling energy generated by the absorption chiller driven by the waste heat of the gas turbine flue gas. The equipment mainly includes air source heat pumps, ground source heat pumps, water source heat pumps, electric chillers, and cooling energy generated by absorption chillers driven by other high-temperature heat sources. These devices are connected in parallel to share the cooling load; for example... Figure 5 As shown, the power supply system includes power supply methods other than gas turbine power generation, and the equipment includes wind turbines, photovoltaics, transformers, controllers and batteries.

[0023] In a preferred embodiment, in step S3, the load is calculated based on the user's heating, cooling, and electricity consumption indicators, or the dynamic load for the whole year is calculated according to building environment simulation analysis software, and the maximum heat load for the whole year is denoted as Q. H The maximum cooling load is denoted as Q. C The maximum electrical load is denoted as Q. E All units are in kW. A user's dynamic cooling, heating, and electrical load for the entire year is as follows: Figure 6 As shown.

[0024] In a preferred embodiment, in step S4, firstly, based on the user's actual needs and local resource conditions, it is determined whether to select the gas tri-generation subsystem. If the gas tri-generation subsystem is selected, the maximum load values ​​corresponding to the three types of loads are compared, Q. H Q C and Q E The corresponding gas turbine capacities are denoted as P. HT P CT and P ET According to Q H Q C and Q E The relative sizes of the three components, and whether to select the aforementioned gas-fired triple-supply system. It should be noted that since the energy supply equipment involved in the cooling load and heating load are usually coupled, for example, a ground source heat pump can provide heating in both winter and summer, the coupling between the cooling system and the heating system must also be considered when selecting the specific equipment composition of the system.

[0025] In a preferred embodiment, all cases are divided into Case 1, Case 2, Case 3, Case 4, Case 5, and Case 6; as shown in Table 1, Case 1 selects the gas tri-generation subsystem and Q H Minimum; Case 2: Select the aforementioned gas-fired combined cooling, heating, and power (CCHP) subsystem and Q C Minimum; Case 3: Select the aforementioned gas-fired combined cooling, heating, and power (CCHP) subsystem and Q E H And Q HR CR Case 4: Select the aforementioned combined gas supply, combined cooling, heating, and power (CCHP) subsystem and Q E C And Q CR HR Case 5: Do not select the aforementioned gas-fired combined cooling, heating, and power (CCHP) subsystem and Q H C Case 6: Do not select the aforementioned gas-fired combined cooling, heating, and power (CCHP) subsystem and Q C H .

[0026] Table 1 Explanation of Six Categories ​​​​​​

[0027] In a preferred embodiment, for case one, the maximum heat load is minimized, with P HT As the actual capacity of the gas turbine, the heat load is entirely borne by the gas turbine, while the electrical and cooling loads are supplemented by other equipment. The electrical and cooling loads supplemented by other equipment are obtained by calculating the maximum electrical and cooling loads remaining after the gas turbine has borne the load, and the system composition of the cooling subsystem and the electrical system is selected accordingly. In scenario two, the maximum cooling load is minimized, with P CT As the actual capacity of the gas turbine, the remaining maximum electrical load and maximum thermal load are calculated respectively, and the system composition of the heating subsystem and the power supply subsystem is selected accordingly. In case three, the maximum electrical load is the minimum, with P ET As the actual capacity of the gas turbine, the remaining maximum heat load Q HR Less than the remaining maximum cooling load Q CR The heating subsystem is selected based on the remaining maximum heat load, and the remaining cooling load is supplemented by a separate cooling subsystem. For scenario four, the maximum electrical load is minimized, PET is taken as the actual capacity of the gas turbine, and the remaining maximum cooling load Q is... CR Less than the remaining maximum heat load Q HR Therefore, the heating subsystem is selected based on the remaining maximum cooling load, and the remaining heat load is then supplemented by a separate cooling subsystem. For scenario five, if the gas turbine combined cooling, heating, and power supply subsystem is not selected and the maximum heat load is relatively small, the heating subsystem should be selected first, and the remaining cooling load should be supplemented by the cooling subsystem, while the power supply subsystem can be selected separately. For scenario six, if the gas turbine combined cooling, heating, and power (CCHP) subsystem is not selected and the maximum cooling load is relatively small, the cooling subsystem should be selected first, and the remaining heat load should be supplemented by the heating subsystem. The power supply subsystem can be selected separately.

[0028] In a preferred embodiment, in step S5, the priority order of operation for each device is set based on its operating cost. Specifically, for an integrated energy supply system, if a gas turbine combined heat and power (CHP) system is selected, this subsystem is operated first because CHP systems typically have the highest energy utilization efficiency. Furthermore, the operating order of the devices included in other subsystems is shown in Table 2.

[0029] Table 2 Equipment Operation Sequence

[0030] Among them, air source heat pumps and biomass boilers in the heating subsystem are of the same priority in most cases. However, the coefficient of performance of air source heat pumps varies greatly under different outdoor temperatures. Therefore, the order of operation of the two needs to be further considered in combination with the actual situation.

[0031] In a preferred embodiment, in step S5, the constructed multi-source power supply system is first built in the TRNSYS simulation platform, and each device module is set up and connected in the simulation platform; then, according to the operating mode selected in step S5, the settings are made in the simulation platform; finally, with the lowest annual cost as the optimization objective function, the capacity of each device is optimized by the genetic optimization algorithm built into the TRNSYS simulation platform, thereby obtaining the optimal system configuration.

[0032] To provide a clearer and more detailed description of the integrated energy system construction method provided by the embodiments of the present invention, specific embodiments will be described below.

[0033] Example 1 Taking a certain commercial complex as an example, the user area is 9600 m². 2 Various dynamic loads were simulated using DeST, and the results are as follows: Figure 6 As shown. Analysis shows that Q... H =753 ​​kW, Q C =1744 kW, Q E =320 kW. This user has a gas pipeline, and gas prices are cheap in the area; therefore, a gas turbine combined cooling, heating, and power (CCHP) system was selected, with a "capacity-based" power generation mode chosen. Subsequently, the heating and cooling power of the gas turbine can be calculated using its typical performance curves, and Q can be calculated accordingly. HR and Q HR The results were 353 kW and 1224 kW, respectively. First, the heating subsystem was selected. The user has a lot of open space around him and a large amount of groundwater, making it suitable to use a ground source heat pump for energy supply. Therefore, a ground source heat pump was selected as a supplementary heating device. Since the ground source heat pump can also provide cooling in summer, an additional ground source heat pump can be added as a cooling device to meet the requirements of various loads.

[0034] A model of the system was built on a simulation platform, and the operating mode was set as follows: gas turbine power generation can meet all electrical loads; in winter, the waste heat from the gas turbine flue gas is prioritized for heating, and the insufficient heat load is supplemented by the ground source heat pump; in summer, the waste heat from the gas turbine flue gas is prioritized for driving the lithium bromide refrigerator for cooling, and the insufficient cooling load is supplemented by the ground source heat pump. After optimization calculation by genetic algorithm, the final system equipment scheme is shown in Table 3.

[0035] Table 3 Final System Equipment Scheme

[0036] The proposed scheme was compared with the traditional "heat-driven power generation" model in terms of economic efficiency, energy consumption, and environmental protection. The results are shown in Table 4.

[0037] Table 4 Comparison Results

Claims

1. A method for constructing an integrated energy system, characterized in that, Includes the following steps: S1: Construct a comprehensive energy system with a broad structure that takes into account pre-defined types of energy supply equipment, energy conversion equipment, and users; S2: The generalized structure is divided into four interconnected and coupled subsystems, including a gas tri-generation subsystem, a heating subsystem, a cooling subsystem, and an electronic power supply system; S3: Calculate the user's heat load, cooling load, and electrical load respectively, and determine the maximum load value corresponding to the three types of loads based on the calculated heat load, cooling load, and electrical load of the user; S4: Based on the user's actual needs and local resource conditions, determine whether to select the gas tri-generation subsystem. Based on whether to select the gas tri-generation subsystem and the relationship between the maximum load values ​​corresponding to the three types of loads, the subsystem screening is divided into six cases. In case one, the maximum heat load is minimized, with the maximum heat load Q being the minimum. H The corresponding gas turbine capacity P HT As the actual capacity of the gas turbine, the heat load is entirely borne by the gas turbine, while the electrical and cooling loads are supplemented by other equipment. The electrical and cooling loads supplemented by other equipment are obtained by calculating the maximum electrical and cooling loads remaining after the gas turbine has borne the load, and the system composition of the cooling subsystem and the electrical system is selected accordingly. In scenario two, the maximum cooling load is minimized, with the maximum cooling load Q being the minimum. C The corresponding gas turbine capacity P CT As the actual capacity of the gas turbine, the remaining maximum electrical load and maximum thermal load are calculated respectively, and the system composition of the heating subsystem and the power supply subsystem is selected accordingly. For scenario three, the maximum electrical load is minimized, with the maximum electrical load Q... E The corresponding gas turbine capacity P ET As the actual capacity of the gas turbine, the remaining maximum heat load Q HR Less than the remaining maximum cooling load Q CR The heating subsystem is selected based on the remaining maximum heat load, and the remaining cooling load is supplemented by a separate cooling subsystem. In case four, the maximum electrical load is the minimum, with P ET As the actual capacity of the gas turbine, and the remaining maximum cooling load Q CR Less than the remaining maximum heat load Q HR Therefore, the cooling subsystem is selected based on the remaining maximum cooling load, and the remaining heat load is supplemented by a separate heating subsystem. In case five, the gas turbine combined cooling, heating and power subsystem is not selected and the maximum heat load is the smallest. In this case, the heating subsystem is selected first, and the remaining cooling load is supplemented by the cooling subsystem. The power supply subsystem can be selected independently. For scenario six, the gas turbine combined cooling, heating and cooling subsystem is not selected, and the maximum cooling load is the smallest. In this case, the cooling subsystem is selected first, and the remaining heat load is supplemented by the heating subsystem. The power supply subsystem can be selected independently. S5: Based on the selected subsystem, set the optimal operating mode of the subsystem; S6: Optimize the capacity of each device in the subsystem to determine the final multi-energy power supply system scheme.

2. The integrated energy system construction method according to claim 1, characterized in that, The generalized structure in S1 takes the heating and distribution center, cooling and distribution center, and power supply and distribution center as the three major hubs of the system.

3. The integrated energy system construction method according to claim 2, characterized in that, The input ends of the heating distribution center include a gas-fired combined heat and power (CHP) system, a coal-fired boiler, a gas-fired boiler, a biomass boiler, thermal storage equipment, solar collectors, air-source heat pumps, ground-source heat pumps, water-source heat pumps, and industrial waste heat; the output ends are thermal storage equipment and heat users. The input ends of the cooling distribution center include a gas-fired CHP system, an air-source heat pump, a ground-source heat pump, a water-source heat pump, an electric chiller, an absorption chiller driven by a high-temperature heat source, and cold storage equipment; the output ends are cold storage equipment and cold users. The input ends of the power distribution center include a gas-fired CHP system, a photovoltaic power station, a wind power station, energy storage equipment, and the power grid; the output ends include air-source heat pumps, ground-source heat pumps, water-source heat pumps, electric chillers, energy storage equipment, and electricity users.

4. The integrated energy system construction method according to claim 1, characterized in that, The gas-fired combined heat and power subsystem in S2 uses natural gas as fuel and drives a generator to generate electricity through combustion. At the same time, the waste heat from the flue gas can be used for heating in winter through a flue gas or water heat exchanger, and can drive a waste heat boiler and an absorption chiller for cooling in summer. The heating subsystem includes all heating methods except for providing heat energy from the waste heat of the gas turbine flue gas. The equipment mainly includes solar collectors, air source heat pumps, water source heat pumps, ground source heat pumps, coal-fired boilers, gas-fired boilers, and water tanks. The solar collectors are connected to the water tanks separately. When the heat generated is greater than the heat demand of the users, it is directly supplied to the users. When the heat generated is less than the heat demand of the users, it is used as the inlet end of other heating equipment for further heating, thereby meeting the heating requirements. The cooling subsystem includes all cooling methods except for the cooling energy generated by the absorption chiller driven by the waste heat of the gas turbine flue gas. The equipment mainly includes air source heat pumps, ground source heat pumps, water source heat pumps, electric chillers, and high-temperature heat source driven absorption chillers. The equipment is connected in parallel to share the cooling load. The power supply system includes power supply methods other than gas turbine power generation, and the equipment includes wind turbines, photovoltaics, transformers, controllers and batteries.

5. The method for constructing an integrated energy system according to claim 1, characterized in that, In S3, the load is calculated based on the user's heating, cooling and electricity consumption indicators, or the dynamic load for the whole year is calculated according to building environment simulation analysis software.

6. The method for constructing an integrated energy system according to claim 1, characterized in that, In step S5, the priority order of operation of each device is set according to the level of operating costs.

7. The method for constructing an integrated energy system according to claim 1, characterized in that, In step S5, the multi-source power supply system is first built in the TRNSYS simulation platform, and each device module is set up and connected in the simulation platform. Subsequently, based on the operating mode selected in S5, settings are made in the simulation platform; finally, with the lowest annual cost as the optimization objective function, the capacity of each device is optimized using the genetic optimization algorithm built into the TRNSYS simulation platform, thereby obtaining the optimal system configuration.

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