Construction method of regional comprehensive energy supply system based on multi-energy coupling

Abstract

The invention discloses a construction method of a regional comprehensive energy supply system based on multi-energy coupling, which solves the defects in the prior art and comprises the following steps: step 1, determining physical elements in the comprehensive energy supply system; 2, linearly connecting energy conversion processes in series to form a multi-energy conversion equivalent decoupling architecture in the comprehensive energy supply system; 3, respectively establishing an energy input matrix, an energy aggregation point matrix, an energy separation point matrix, an energy transmission network matrix and an energy output matrix according to the equivalent decoupling architecture, and then generating a multistage decoupling energy hub model; 4, analyzing the influence of the energy storage equipment on the energy input side and the energy output side on the multi-energy coupling mechanism; 5, analyzing the influence of the demand response link on the multi-energy coupling mechanism; and step 6, generating the regional comprehensive energy supply system based on the influence of the energy input side and the energy output side of the energy hub model structure on the multi-energy coupling mechanism and the influence of the demand response link on the multi-energy coupling mechanism.

Description

Technical Field

[0001] The present invention relates to the technical field of integrated energy systems, and in particular to a method for constructing a regional integrated energy supply system based on multi-energy coupling. Background Art

[0002] The regional integrated energy supply system is an integrated energy production, supply and marketing system formed by organically coordinating and optimizing the production, transmission, distribution, conversion, storage and consumption of energy in a specific region. The system covers multiple energy forms such as electricity, gas, heat and cold, aiming to achieve efficient use of energy and multi-energy cascade utilization by users.

[0003] However, the existing regional integrated energy supply system still has some shortcomings: in the regional integrated energy supply system with multi-energy coupling, the conversion and transmission relationship between various energy sources may be very complicated, and the existing technology may not be able to clearly obtain this coupling mechanism. At the same time, it is difficult to adapt to complex scenarios involving multiple energy inputs, outputs and conversion processes. When constructing a regional integrated energy supply system, it cannot meet the actual operation requirements. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings of the regional comprehensive energy supply system in the prior art, that the conversion and transmission relationship between various energy sources is relatively complex, the construction of the regional comprehensive energy supply system cannot meet the actual operation requirements, and it is difficult to adapt to complex scenarios involving multiple energy input, output and conversion processes, and to provide a construction method of a regional comprehensive energy supply system based on multi-energy coupling.

[0005] The purpose of the present invention is achieved through the following technical solutions: The method for constructing a regional integrated energy supply system based on multi-energy coupling includes the following steps: Step 1: determine the physical elements in the integrated energy supply system, which include the types of energy input, energy output, energy transmission network type, energy aggregation point and energy separation point; Step 2: With energy conversion equipment, energy aggregation points and energy separation points as key coupling nodes, the energy conversion process is linearly connected in series to form an equivalent decoupling architecture for multi-energy conversion in the integrated energy supply system; Step 3: According to the equivalent decoupling architecture, the energy input matrix, energy aggregation point matrix, energy separation point matrix, energy transmission network matrix and energy output matrix are established respectively to quantitatively characterize the multi-energy coupling mechanism in the integrated energy supply system, and then a multi-level decoupled energy hub model is generated; Step 4, analyzing the impact of energy storage devices on the energy input side and the energy output side on the multi-energy coupling mechanism; Step 5, analyzing the impact of demand response on multi-energy coupling mechanism; Step 6: Generate a regional comprehensive energy supply system based on the energy hub model, combining the impact of the energy input side and the energy output side on the multi-energy coupling mechanism, and the impact of the demand response link on the multi-energy coupling mechanism.

[0006] The solution of the present invention provides a complete regional integrated energy supply system construction process by clarifying the physical elements, establishing an equivalent decoupling architecture, and generating the energy hub model. Among them, by establishing an energy input matrix, an energy aggregation point matrix, an energy separation point matrix, an energy transmission network matrix, and an energy output matrix, the multi-energy coupling mechanism is quantitatively characterized and the coupling mechanism is clarified. Furthermore, this solution considers the role of energy storage equipment and demand response links in the multi-energy coupling regional integrated energy supply system, so that the constructed system is more in line with actual operation requirements. Through the multi-level decoupled energy hub model, this solution can better cope with the multi-energy coupling problem in complex scenarios.

[0007] Preferably, in step 1, the types of energy input include coal, oil, natural gas, wind, light, biomass and geothermal energy; the types of energy output include electricity, heat and gas; the network types of energy transmission include heat network, power network and gas network; the energy aggregation point is a device or equipment that locally realizes energy aggregation according to the terminal energy demand type; the energy separation point is a device and equipment that locally realizes multi-energy conversion according to the terminal energy demand type.

[0008] Preferably, the step 2 specifically includes the following sub-steps: Sub-step 1, determining the number of energy interfaces at the energy input end, where the number of interfaces is equal to the sum of the number of energy types at the energy input end and the number of distributed power types in the region; Sub-step 2: Move the energy storage device to the energy input end or energy output end according to the function of the energy storage device, move the user-side energy storage device to the energy output side, move the power supply-side energy storage device to the energy input side, and remove the energy aggregation point or energy separation point closest to the energy storage device; Sub-step 3, coefficients are added to the number of energy aggregation points, energy separation points, energy conversion nodes, and energy transmission networks, and all energy conversion processes from energy input to energy output are sorted out in the form of a list, and the number of intermediate layers is determined based on the longest energy conversion process; Sub-step 4, corresponding to each energy conversion process, according to the determined number of intermediate layers, completing the energy conversion equipment of each intermediate layer; Sub-step 5, in the order of energy input, energy aggregation point or energy separation point, energy transmission network, and energy output, an equivalent decoupling architecture for multi-energy conversion in the integrated energy supply system is constructed in series.

[0009] Preferably, the step 3 is specifically as follows: Define the energy input matrix: Define P∈RN×1 is the energy input matrix, where N is the type of input energy; Define the energy output matrix: Define L∈R M×1 is the energy output matrix, where M is the type of output energy; Define the energy aggregation point submatrix: Define Q as the energy aggregation submatrix, and the element Q(i,j)∈{0,1} in Q, where Q(i,j)=1 represents the aggregation of the i-th energy form in P, and Q(i,j)=0 represents that the aggregation point does not involve the aggregation of the i-th energy form. Corresponding to the energy output matrix L, we have: Define the energy separation point matrix: Define K as the energy separation submatrix, and the element K(i,j) in K = δ ij It represents the distribution coefficient of the energy flow separation point to each branch, corresponding to the energy output matrix L, which is: where δ 1i +δ 2i +…+δ Mi =1; Forming the basic energy hub model: The basic energy hub has only one intermediate layer. Taking into account the input matrix, energy aggregation point matrix, energy separation point matrix, energy transmission network matrix, and energy output matrix, the energy hub model is formed: L = Q·K·P, also expressed as L = C 0 P; Forming a multi-level decoupled energy hub model: Assuming that there are X layers in the middle layer, we have: L=C X C X-1 …C 2 C 1 P=C·P Where C represents the final output matrix.

[0010] Preferably, in step 4, the influence of the energy storage devices on the energy input side and the energy output side on the multi-energy coupling mechanism is analyzed, specifically: Energy storage on the energy input side modifies the energy hub model, defining A 1 ∈R N×1 is the energy storage matrix on the energy input side, and by correcting L=C·P, we can get: L=C(P+A 1 ); Energy storage on the energy output side modifies the energy hub model, defining A 2 ∈R M×1 is the energy storage matrix on the energy output side, and by correcting L=C·P, we can get: L+A 2 =CP; By modifying the energy hub model by integrating energy storage on the energy input side and energy storage on the energy output side, we can get: L=C(P+A 1 )-A 2 =C·P+C·A 1 -A 2 =C·P+A eq ; Among them A eq ∈RM ×1 , specifically expressed as: Where E i is the storage capacity of the ith form of energy, s ij represents the energy storage coupling factor, and the corresponding matrix S is the energy storage coupling matrix.

[0011] Preferably, in step 5, the influence of the demand response link on the multi-energy coupling mechanism is analyzed, specifically: By correcting L = C·P, we can obtain: L+L DM =CP; Where L DM ∈R M×1 is the demand response matrix, expressed as: Where, d ij is the demand response coupling factor, which represents the impact of the i-th form of energy demand response on the j-th form of energy output, and D is the demand response coupling matrix.

[0012] Preferably, in step 6, the regional integrated energy supply system is based on a regional integrated energy hub mathematical model, which is expressed as:

[0013] The beneficial effects of the present invention are as follows: the present invention provides a complete regional integrated energy supply system construction process by clarifying the physical elements, establishing an equivalent decoupling architecture, and generating the steps of the energy hub model, wherein the multi-energy coupling mechanism is quantitatively characterized and the coupling mechanism is clarified by establishing an energy input matrix, an energy aggregation point matrix, an energy separation point matrix, an energy transmission network matrix, and an energy output matrix. Furthermore, the present solution takes into account the role of energy storage equipment and demand response links in the multi-energy coupled regional integrated energy supply system, so that the constructed system is more in line with actual operation requirements. Through the solution of the present invention, different types of energy can be more effectively utilized to achieve complementarity and optimal configuration between energies. The multi-energy coupled system can flexibly adjust energy input and output according to actual needs to enhance the reliability and stability of energy supply. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a flow chart of the present invention; Figure 2 It is a schematic diagram of a multi-energy coupling structure of a regional comprehensive energy supply system of the present invention; Figure 3 It is a schematic diagram of the energy flow architecture of a regional integrated energy supply system of the present invention; Figure 4 It is a schematic diagram of the energy flow architecture of the regional integrated energy supply system after the energy storage device is updated; Figure 5 It is a schematic diagram of the decoupled architecture of the regional integrated energy supply system. DETAILED DESCRIPTION

[0015] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0016] Embodiment: A method for constructing a regional integrated energy supply system based on multi-energy coupling, such as Figure 1 As shown, the following steps are included: Step 1: determine the physical elements in the integrated energy supply system, which include the types of energy input, energy output, energy transmission network type, energy aggregation point and energy separation point; Step 2: With energy conversion equipment, energy aggregation points and energy separation points as key coupling nodes, the energy conversion process is linearly connected in series to form an equivalent decoupling architecture for multi-energy conversion in the integrated energy supply system; Step 3: According to the equivalent decoupling architecture, the energy input matrix, energy aggregation point matrix, energy separation point matrix, energy transmission network matrix and energy output matrix are established respectively to quantitatively characterize the multi-energy coupling mechanism in the integrated energy supply system, and then a multi-level decoupled energy hub model is generated; Step 4, analyzing the impact of energy storage devices on the energy input side and the energy output side on the multi-energy coupling mechanism; Step 5, analyzing the impact of demand response on multi-energy coupling mechanism; Step 6: Generate a regional comprehensive energy supply system based on the energy hub model, combining the impact of the energy input side and the energy output side on the multi-energy coupling mechanism, and the impact of the demand response link on the multi-energy coupling mechanism.

[0017] The solution of the present invention provides a complete regional integrated energy supply system construction process by clarifying the physical elements, establishing an equivalent decoupling architecture, and generating the energy hub model. Among them, by establishing an energy input matrix, an energy aggregation point matrix, an energy separation point matrix, an energy transmission network matrix, and an energy output matrix, the multi-energy coupling mechanism is quantitatively characterized and the coupling mechanism is clarified. Furthermore, this solution considers the role of energy storage equipment and demand response links in the multi-energy coupling regional integrated energy supply system, so that the constructed system is more in line with actual operation requirements. Through the multi-level decoupled energy hub model, this solution can better cope with the multi-energy coupling problem in complex scenarios.

[0018] In the step 1, the types of energy input include coal, oil, natural gas, wind, light, biomass and geothermal energy; the types of energy output include electricity, heat and gas; the network types of energy transmission include heat network, power network and gas network; the energy aggregation point is a device or equipment that locally realizes energy aggregation according to the terminal energy demand type; the energy separation point is a device and equipment that locally realizes multi-energy conversion according to the terminal energy demand type.

[0019] The step 2 specifically includes the following sub-steps: Sub-step 1, determining the number of energy interfaces at the energy input end, where the number of interfaces is equal to the sum of the number of energy types at the energy input end and the number of distributed power types in the region; Sub-step 2: Move the energy storage device to the energy input end or energy output end according to the function of the energy storage device, move the user-side energy storage device to the energy output side, move the power supply-side energy storage device to the energy input side, and remove the energy aggregation point or energy separation point closest to the energy storage device; Sub-step 3, coefficients are added to the number of energy aggregation points, energy separation points, energy conversion nodes, and energy transmission networks, and all energy conversion processes from energy input to energy output are sorted out in the form of a list, and the number of intermediate layers is determined based on the longest energy conversion process; Sub-step 4, corresponding to each energy conversion process, according to the determined number of intermediate layers, completing the energy conversion equipment of each intermediate layer; Sub-step 5, in the order of energy input, energy aggregation point or energy separation point, energy transmission network, and energy output, an equivalent decoupling architecture for multi-energy conversion in the integrated energy supply system is constructed in series.

[0020] The step 3 is specifically as follows: Define the energy input matrix: Define P∈R N×1 is the energy input matrix, where N is the type of input energy; Define the energy output matrix: Define L∈R M×1 is the energy output matrix, where M is the type of output energy; Define the energy aggregation point submatrix: Define Q as the energy aggregation submatrix, and the element Q(i,j)∈{0,1} in Q, where Q(i,j)=1 represents the aggregation of the i-th energy form in P, and Q(i,j)=0 represents that the aggregation point does not involve the aggregation of the i-th energy form. Corresponding to the energy output matrix L, we have: Define the energy separation point matrix: Define K as the energy separation submatrix, and the element K(i,j) in K = δ ij It represents the distribution coefficient of the energy flow separation point to each branch, corresponding to the energy output matrix L, which is: where δ 1i +δ 2i +…+δ Mi =1; Forming the basic energy hub model: The basic energy hub has only one intermediate layer. Taking into account the input matrix, energy aggregation point matrix, energy separation point matrix, energy transmission network matrix, and energy output matrix, the energy hub model is formed: L = Q·K·P, also expressed as L = C 0 P; Forming a multi-level decoupled energy hub model: Assuming that there are X layers in the middle layer, we have: L=C X C X-1 …C 2 C 1 P=C·P Where C represents the final output matrix.

[0021] In step 4, the influence of the energy storage devices on the energy input side and the energy output side on the multi-energy coupling mechanism is analyzed, specifically: Energy storage on the energy input side modifies the energy hub model, defining A 1 ∈R N×1 is the energy storage matrix on the energy input side, and by correcting L=C·P, we can get: L=C(P+A 1 ); Energy storage on the energy output side modifies the energy hub model, defining A 2 ∈R M×1 is the energy storage matrix on the energy output side, and by correcting L=C·P, we can get: L+A 2 =CP; By modifying the energy hub model by integrating energy storage on the energy input side and energy storage on the energy output side, we can get: L=C(P+A 1 )-A 2 =C·P+C·A1 -A 2 =C·P+A eq ; Among them A eq ∈R M×1 , specifically expressed as: Where E i is the storage capacity of the ith form of energy, s ij represents the energy storage coupling factor, and the corresponding matrix S is the energy storage coupling matrix.

[0022] In step 5, the impact of the demand response link on the multi-energy coupling mechanism is analyzed, specifically: By correcting L = C·P, we can obtain: L+L DM =CP; Where L DM ∈R M×1 is the demand response matrix, expressed as: Where, d ij is the demand response coupling factor, which represents the impact of the i-th form of energy demand response on the j-th form of energy output, and D is the demand response coupling matrix.

[0023] In step 6, the regional integrated energy supply system is based on a regional integrated energy hub mathematical model, which is expressed as:

[0024] The coordinated optimization of multi-energy coupling in the regional integrated energy supply system is more reflected in the energy conversion equipment level. Corresponding to the multi-energy coupling conversion mechanism, the key link of multi-energy conversion is various energy conversion equipment. By rationally configuring different energy conversion equipment in the integrated energy supply system, it is possible to convert various primary energy sources such as solar energy, wind energy, and natural gas into industrial and domestic energy such as cold, heat, electricity, and hydrogen. This is a direct reflection of the mutual coupling between different energy sources such as electricity, heat, cold, gas, and hydrogen. Through combing and research, the following table shows common multi-energy coupling conversion equipment.

[0025] Common multi-energy coupling conversion devices The specific equipment is as follows: (1) Heat storage electric boiler The basic structure of a thermal storage electric boiler includes electric heating equipment, heat storage equipment, primary and secondary heat exchangers, and a water circulation system. The thermal storage electric boiler uses liquid water as the heat storage medium. The original cold water in the heat storage tank flows to the electric boiler for heating under the action of a circulating pump. The circulation system flows the water heated by the electric boiler to the hot water storage tank for storage, realizing the process of electricity-to-heat conversion. In addition, the thermal storage electric boiler completes the electricity-heat conversion and storage within 6-8 hours during the low load period at night, and releases the stored heat by radiation and convection heat exchange during the peak load period, which can achieve uninterrupted heating during the day. Compared with the real-time electricity heating of conventional electric boilers, the flexibility of electricity use is greatly improved.

[0026] (2) Compression Refrigerator The refrigeration unit is the core component of the refrigeration system. The figure below is a working principle diagram of a compression refrigeration unit. The main equipment of a compression refrigeration unit includes a scroll compressor, an air-cooled condenser, a throttling device and an evaporator. The throttling device is equipped with three different throttling modes: an electronic expansion valve, a thermal expansion valve and an electric needle expansion valve.

[0027] (3) Heat pump Heat pump energy conversion utilizes the function of the compressor. By consuming a certain amount of auxiliary energy (electric energy), under the joint action of the compressor and the refrigerant circulating in the heat exchange system, the lower temperature heat energy is absorbed from the environmental heat source, and then converted into higher temperature heat energy and released into the circulating medium as a high temperature heat source output. In this case, the operation of the compressor consumes electrical energy. The operation of the compressor causes the continuously circulating refrigerant to produce different change states and different effects in different systems (i.e., evaporation absorbs heat and condensation releases heat), thereby achieving the function and purpose of recovering low-temperature heat sources to produce high-temperature heat sources. The main components of the heat pump system are the compressor, condenser, throttle valve, and evaporator. Although there are different thermodynamic cycles that can realize the transfer of heat from a low-temperature heat source to a high-temperature heat sink, the mainstream form is the vapor compression cycle, in which the working medium (refrigerant) is successively evaporated, compressed, and condensed to achieve heat transfer.

[0028] (4) Water electrolysis hydrogen production system According to the difference of electrolyte system, water electrolysis can be divided into three types: alkaline water electrolysis, proton exchange membrane (PEM) water electrolysis and solid oxide water electrolysis. The basic principles of the three are the same, that is, in the process of redox reaction, the free exchange of electrons is prevented, and the charge transfer process is decomposed into electron transfer in the external circuit and ion transfer in the internal circuit, so as to achieve the production and utilization of hydrogen.

[0029] (5) Gas trigeneration unit Natural gas-based combined cooling, heating and power (CCHP) system. A single CCHP system is mainly composed of a prime mover, a gas boiler, an absorption refrigeration unit, a heat exchanger, and an electric refrigeration unit.

[0030] (6) Photovoltaic power generation system Photovoltaic power generation systems can be divided into grid-connected systems and off-grid systems according to whether the system is connected to the grid. The PV array in the grid-connected photovoltaic power generation system generally needs to be connected to the inverter through a combiner box to transmit electricity to the grid. In this process, there is no need to store electricity, which reduces the cost of building the system in the early stage. It is usually connected to the city's power grid and is mostly used for large-scale centralized grid-connected photovoltaic power stations or distributed rooftop power generation.

[0031] (7) Solar thermal power generation system Solar thermal power generation technology is an emerging solar power generation technology. Its basic principle is as follows: the sun's rays are concentrated by concentrators to heat water at high temperature, realizing the conversion from light energy to heat energy; and part of the heat energy is converted into high-temperature and high-pressure steam through a thermal cycle to drive the steam turbine generator to generate electricity, realizing the conversion from heat energy to electrical energy. The other part enters the heat storage system of the solar thermal power station and is stored in hot tanks and cold tanks through hot molten salt for scheduling use.

[0032] (8) Wind turbines The wind power generation system is mainly composed of the following four parts: the first part is the wind wheel that converts wind energy into mechanical energy, the second part is the AC generator that converts mechanical energy into electrical energy, the third part is the rectifier that converts AC into DC, and the fourth part is the inverter that converts DC into AC. The second part is the AC generator that converts mechanical energy into electrical energy, the third part is the rectifier that converts AC into DC, and the fourth part is the inverter that converts DC into AC.

[0033] (9) Electrical energy storage The essence of electric energy storage is to convert electrical energy into other forms of energy and store it for a period of time. When needed, these energies are converted into electrical energy and fed back into the power system for use. The electric energy storage system itself is not a power source, but only acts as an energy buffer device for the power system. It can reasonably transfer electrical energy according to the output of other power sources, thereby decoupling the production and consumption of electrical energy in time. At the same time, the response speed of the electric energy storage system can reach the minute level, and it can participate in the real-time regulation of the power system. It is widely used to improve the flexibility of the system and promote the consumption of wind power. Among the three energy storage technologies of electromagnetic energy storage, physical energy storage and electrochemical energy storage, electrochemical energy storage has more advantages in applicable scale and response speed.

[0034] The following is an example of a regional integrated energy supply system. Figure 2 As shown in the figure, the regional integrated energy supply system uses electricity and natural gas as the main energy sources, and distributed photovoltaic and distributed wind power are regional renewable energy supply units. In terms of energy output, it includes four energy forms: electricity, heat, cold, and natural gas. In terms of energy storage, the region is connected to electric energy storage devices and thermal storage devices to store electricity and thermal energy respectively.

[0035] Now the regional comprehensive energy supply system is modeled based on multi-energy coupling: (1) Determine the basic elements of the regional integrated energy supply system 1) Energy input type: electricity (from the grid) PG, natural gas GA, wind energy WP, solar energy PV 2) Types of energy output: electricity EL, heat HL, cold CL, natural gas GS 3) Determine the network type for energy transmission: heat network H, power network P, gas network G, cold network C.

[0036] 4) Determine the energy conversion point: transformer Tr, combined heat and power unit CHP, gas boiler GB, electric heater EH, heat exchanger RE, electric refrigerator EC, absorption refrigerator AC 5) Determine the energy aggregation point ECU: 2 electrical energy aggregation points, 2 thermal energy aggregation points, 1 cold energy aggregation point 6) Determine the energy separation point ECU: 2 electrical energy separation points, 1 thermal energy separation point, 1 natural gas separation point 7) Determine the energy storage point: 1 electric energy storage device ES, 1 thermal storage device TS 8) Establish the energy flow framework of the regional integrated energy supply system: divide the energy input, energy output, and energy transmission network, such as Figure 3 shown.

[0037] (2) Determine the decoupling architecture of the regional integrated energy supply system 1) Determine the number of energy interfaces at the energy input end: the number of interfaces is the sum of energy input 1 and energy input 2. It is assumed that wind power generation and photovoltaic power generation in the region are collectively referred to as distributed renewable energy power sources. Then the number of energy interfaces at the energy input end is 3, namely power grid, natural gas and distributed renewable energy power generation.

[0038] 2) Processing of energy storage points in the multi-energy coupling architecture: Area A involves the electric energy storage device ES and the thermal storage device TS, as well as the corresponding energy aggregation points ECU5 and ECU7, which are removed from the energy transmission network. The energy structure diagram of the system is updated to Figure 4 .

[0039] 3) Determine the number of intermediate layers: The following table summarizes Figure 4There are 17 energy conversion paths in total, and the number of intermediate layers in the system is determined to be 9.

[0040] Sorting out the energy conversion path in a certain area 4) Complete the intermediate-layer energy conversion network: Based on 3, corresponding to each energy conversion process, according to the determined number of intermediate layers, complete the energy conversion equipment VV of each intermediate layer. The principle of completion is that each vacancy is defined as an energy conversion device with an efficiency of 100% from energy A to energy A.

[0041] 5) Generate the decoupled architecture of the integrated energy supply system: According to the order of energy input, aggregation / separation point, energy transmission network, and energy output, the decoupled architecture of the integrated energy supply system is formed in series, such as Figure 5 shown.

[0042] (3) Establish a mathematical model of a multi-level decoupled energy hub 1) Define the energy input matrix: 2) Define the energy output matrix: 3) Form a multi-level decoupled energy hub model: Energy aggregation idea matrix, energy separation idea matrix, energy basic hub model, etc. are all constructed in the energy hub model that forms a multi-level decoupled model. Figure 5 It can be obtained that the multi-level decoupled energy hub matrix of region A is: L A =C 9 ·C 8 ·C 7 ·C 6 ·C 5 ·C 4 ·C 3 ·C 2 ·C 1 P=C A ·P in: δ 11 +δ 12 +δ 13 =1 δ 81 +δ 82 =1 δ 41 +δ42 =1,δ 91 +δ 92 =1,

[0043] (4) Establish a mathematical model of energy hubs containing energy storage elements There are two load-side energy storages in area A, namely load-side electric energy storage and load-side thermal energy storage. L A1 =C A ·P+S·E (5) Establishing a mathematical model of energy hub with demand response If it is assumed that there are load-side adjustable resources in area A, it is the adjustable resources of electric load Cooling load adjustable resources Heat load adjustable resources From this we can get: L A2 =C A ·P+D·E DM (6) Establishment of mathematical model of comprehensive energy hub in region A Comprehensive L A , L A1 , L A2 , you can get, L A0 =L A0 +L A1 +L A2 =C A ·P+S·E+D·E DM .

[0044] The above-described embodiment is only a preferred solution of the present invention and does not limit the present invention in any form. There are other variations and modifications without exceeding the technical solution described in the claims.

Claims

1. A method for constructing a regional integrated energy supply system based on multi-energy coupling, characterized in that: The following steps are involved: Step 1: determine the physical elements in the integrated energy supply system, which include the types of energy input, energy output, energy transmission network type, energy aggregation point and energy separation point; Step 2: With energy conversion equipment, energy aggregation points and energy separation points as key coupling nodes, the energy conversion process is linearly connected in series to form an equivalent decoupling architecture for multi-energy conversion in the integrated energy supply system; Step 3: According to the equivalent decoupling architecture, the energy input matrix, energy aggregation point matrix, energy separation point matrix, energy transmission network matrix and energy output matrix are established respectively to quantitatively characterize the multi-energy coupling mechanism in the integrated energy supply system, and then a multi-level decoupled energy hub model is generated; Step 4, analyzing the impact of energy storage devices on the energy input side and the energy output side on the multi-energy coupling mechanism; Step 5, analyzing the impact of demand response on multi-energy coupling mechanism; Step 6: Generate a regional comprehensive energy supply system based on the energy hub model, combining the impact of the energy input side and the energy output side on the multi-energy coupling mechanism, and the impact of the demand response link on the multi-energy coupling mechanism.

2. The method for constructing a regional integrated energy supply system based on multi-energy coupling according to claim 1 is characterized in that: In the step 1, the types of energy input include coal, oil, natural gas, wind, light, biomass and geothermal energy; the types of energy output include electricity, heat and gas; the network types of energy transmission include heat network, power network and gas network; the energy aggregation point is a device or equipment that locally realizes energy aggregation according to the terminal energy demand type; the energy separation point is a device and equipment that locally realizes multi-energy conversion according to the terminal energy demand type.

3. The method for constructing a regional integrated energy supply system based on multi-energy coupling according to claim 1 or 2, characterized in that: The step 2 specifically includes the following sub-steps: Sub-step 1, determining the number of energy interfaces at the energy input end, where the number of interfaces is equal to the sum of the number of energy types at the energy input end and the number of distributed power types in the region; Sub-step 2: Move the energy storage device to the energy input end or energy output end according to the function of the energy storage device, move the user-side energy storage device to the energy output side, move the power supply-side energy storage device to the energy input side, and remove the energy aggregation point or energy separation point closest to the energy storage device; Sub-step 3, coefficients are added to the number of energy aggregation points, energy separation points, energy conversion nodes, and energy transmission networks, and all energy conversion processes from energy input to energy output are sorted out in the form of a list, and the number of intermediate layers is determined based on the longest energy conversion process; Sub-step 4, corresponding to each energy conversion process, according to the determined number of intermediate layers, completing the energy conversion equipment of each intermediate layer; Sub-step 5, in the order of energy input, energy aggregation point or energy separation point, energy transmission network, and energy output, an equivalent decoupling architecture for multi-energy conversion in the integrated energy supply system is constructed in series.

4. The method for constructing a regional integrated energy supply system based on multi-energy coupling according to claim 3 is characterized in that: The step 3 is specifically as follows: Define the energy input matrix: Define P∈R N×1 is the energy input matrix, where N is the type of input energy; Define the energy output matrix: Define L∈R M×1 is the energy output matrix, where M is the type of output energy; Define the energy aggregation point submatrix: Define Q as the energy aggregation submatrix, and the element Q(i,j)∈{0,1} in Q, where Q(i,j)=1 represents the aggregation of the i-th energy form in P, and Q(i,j)=0 represents that the aggregation point does not involve the aggregation of the i-th energy form. Corresponding to the energy output matrix L, we have: Define the energy separation point matrix: Define K as the energy separation submatrix, and the element K(i,j) in K = δ ij It represents the distribution coefficient of the energy flow separation point to each branch, corresponding to the energy output matrix L, which is: among them 1i +d 2i +…+d Mi =1; Forming the basic energy hub model: The basic energy hub has only one intermediate layer, which comprehensively considers the input matrix, energy aggregation point matrix, energy separation point matrix, energy transmission network matrix, and energy output matrix to form the energy hub model: L = Q·K·P, also expressed as L = C0P; Forming a multi-level decoupled energy hub model: Assuming that there are X layers in the middle layer, we have: L=C X C X-1 …C2C1P=C·P Where C represents the final output matrix.

5. The method for constructing a regional integrated energy supply system based on multi-energy coupling according to claim 4 is characterized in that: In step 4, the influence of energy storage equipment on the energy input side and the energy output side on the multi-energy coupling mechanism is analyzed, specifically: the energy storage on the energy input side modifies the energy hub model, and defines A1∈R N×1 is the energy storage matrix on the energy input side, and by correcting L=C·P, we can get: L = C (P + A1); Energy storage at the energy output side modifies the energy hub model, defining A2∈R M×1 is the energy storage matrix on the energy output side, and by correcting L=C·P, we can get: L+A2=CP; By modifying the energy hub model by integrating energy storage on the energy input side and energy storage on the energy output side, we can get: L=C(P+A1)-A2 =C·P+C·A1-A2=C·P+A eq ; Among them A eq ∈R M×1 , specifically expressed as: Where E i is the storage capacity of the ith form of energy, s ij represents the energy storage coupling factor, and the corresponding matrix S is the energy storage coupling matrix.

6. The method for constructing a regional integrated energy supply system based on multi-energy coupling according to claim 5 is characterized in that: In step 5, the impact of the demand response link on the multi-energy coupling mechanism is analyzed, specifically: By correcting L = C·P, we can obtain: L+L DM =CP; Where L DM ∈R M×1 is the demand response matrix, expressed as: Where, d ij is the demand response coupling factor, which represents the impact of the i-th form of energy demand response on the j-th form of energy output, and D is the demand response coupling matrix.

7. The method for constructing a regional integrated energy supply system based on multi-energy coupling according to claim 6 is characterized in that: In step 6, the regional integrated energy supply system is based on a regional integrated energy hub mathematical model, which is expressed as:

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