Microgrid park integrated energy system planning method and device, terminal and medium

Abstract

The invention discloses a micro-grid park integrated energy system planning method and device, a terminal and a medium. The method comprises the following steps: acquiring energy demand data, time-of-use electricity price information, natural gas price and meteorological information of a park to be planned, and equipment parameters, equipment investment cost and equipment maintenance cost in an integrated energy system of the park to be planned; the influence of temperature change on thermodynamic characteristics of steam is considered, and equivalent energy storage of a steam heat accumulator of the microgrid park is modeled by considering valley electricity heat storage; setting constraint conditions of a planning model according to the acquired data information, and taking the minimum comprehensive cost as an objective function, thereby constructing a cold-hot electro-optical storage and charging integrated microgrid park planning model considering electric power-steam multi-energy complementation; and solving the planning model, and outputting a planning scheme about whether each device in the integrated energy system is configured, the configuration capacity and the operation output curve of each configured device. According to the invention, the energy structure of the park is optimized, the resource utilization efficiency is improved, and the stability of the system is enhanced.

Description

Technical Field

[0001] The present invention belongs to the field of integrated energy technology, and in particular relates to a method, device, terminal and medium for planning an integrated energy system for a microgrid park. Background Art

[0002] A microgrid park refers to an independent small power system formed in a specific area by integrating various distributed energy resources (such as solar energy, wind energy, energy storage equipment, heat source, etc.) with smart grid technology. With the rapid development of renewable energy and smart microgrid technology, the efficient use and optimal configuration of energy in the park has gradually become a research hotspot, and the application of microgrid systems has shown great potential in improving energy efficiency and reliability. In view of this, it is particularly important to explore the planning and design of the comprehensive energy system of the microgrid park.

[0003] Related technologies have studied the energy optimization configuration of microgrid parks. For example, a carbon emission planning method for a park integrated energy system that takes generalized energy storage into account is currently disclosed. With the low-carbon planning of the integrated energy system as the goal, a general unified model that considers battery energy storage, building thermal energy storage, and data center thermal energy storage as generalized energy storage is established. However, this method does not consider steam load in the planning scheme, lacks exploration of the possibility of steam energy storage, and does not conduct in-depth research on the form of electricity-steam synergy. Some technologies also study the modeling and simulation of steam hybrid in the integrated energy system of industrial parks. In view of the lack of dynamic modeling and analysis of steam modeling in the current integrated energy system of industrial parks and the trade-off between accuracy and computational efficiency when using numerical methods to solve, a hydraulic and thermal mathematical model describing the steam flow process is constructed based on the basic equation of steam flow. However, this study does not fully consider the influence of the thermodynamic characteristics of steam changing with temperature, and ignores the relationship between steam flow and temperature, which affects the analysis of steam flow characteristics and energy transmission efficiency.

[0004] In summary, existing technologies usually focus on the coordination between cooling, heating and power systems and renewable energy (such as photovoltaic power generation), and achieve optimal configuration of energy production and consumption by analyzing the complementary characteristics of cooling, heating and power. However, although existing planning methods can optimize energy configuration, they lack refined modeling and regulation when facing industrial users, especially when it comes to steam energy consumption characteristics, and fail to fully tap the flexible scheduling potential of various energy resources in the park. At the same time, the current planning scheme fails to take into account the equivalent energy storage characteristics of steam, which makes the supply scheduling of electricity and steam unreasonable, resulting in insufficient optimization in the coordination of electricity and steam, and low energy utilization. Summary of the invention

[0005] In order to solve the deficiencies in the prior art, the present invention fully considers the steam equivalent energy storage characteristics, and provides a microgrid park comprehensive energy system planning method, device, terminal and medium, and carries out integrated planning and design of cold, heat, electricity, light, storage and charging for the microgrid park based on the multi-energy complementarity of electricity and steam, ensuring that the planning cost of the microgrid park comprehensive energy system is the lowest while optimizing the energy structure of the park, maximizing the utilization efficiency of resources, and enhancing the economy and stability of the system.

[0006] The present invention adopts the following technical solution.

[0007] In a first aspect, the present invention provides a method for planning a microgrid park integrated energy system, the method comprising: Step S1, obtaining energy demand data, time-of-use electricity price information, natural gas price, meteorological information and equipment parameters, equipment investment cost and equipment maintenance cost of the park to be planned; Step S2: Based on the energy hub structure of the integrated energy system, taking into account the impact of temperature changes on the thermodynamic characteristics of steam, and considering valley electricity thermal storage to model the equivalent energy storage of the steam thermal accumulator of the microgrid park; Step S3, based on the equivalent energy storage characteristics of the steam accumulator, combined with the data information obtained in step S1, setting the constraints of the planning model, and taking the minimum comprehensive cost as the objective function, thereby constructing a microgrid park planning model that integrates cold, hot, electric, photovoltaic, storage and charging and considers the complementary multi-energy of electricity and steam; Step S4, solving the integrated microgrid park planning model for cooling, heating, electricity, light, storage and charging, and outputting a planning scheme for whether each device in the integrated energy system is configured, the configured capacity, and the operating output curve of each configured device.

[0008] Optionally, the equipment in the integrated energy system includes: an industrial steam boiler, a steam accumulator, a battery, a photovoltaic generator set, a wind generator set, an air conditioner, an electric boiler, an air source heat pump and / or a cold accumulator.

[0009] Optionally, the step S2 specifically includes: S2.1. Based on the material balance, hydraulic balance and thermal balance principles in thermodynamics, a mathematical and physical model of the steam accumulator during the charging and discharging process is constructed. S2.2. Based on the mathematical and physical model of the charging process, a charging steam flow model and a charging steam energy model of the steam accumulator are constructed; S2.3. Based on the mathematical and physical model of the heat release process, a steam release flow model and a steam release energy model of the steam accumulator are constructed; S2.4. Taking into account the relationship between steam flow and steam enthalpy, an equivalent energy storage model of a steam accumulator including steam flow constraints and steam energy constraints is constructed.

[0010] Optionally, in step S2.2, the expressions of the charging steam flow model and the charging steam energy model are constructed as follows: , In the formula, is the steam flow rate charged; and are the density of steam inside the steam accumulator at the initial and final moments of charging, respectively; and are the densities of water inside the steam accumulator at the initial and final moments of charging, respectively; It represents the water filling coefficient; It indicates the ratio of the volume of water to the volume of the steam accumulator at the initial moment of charging; is the volume of the steam accumulator; is the charging time step; Indicates the steam energy charged, is the thermal enthalpy of steam charged into the steam accumulator.

[0011] Optionally, in step S2.3, the expressions of the released steam flow model and the released steam energy model are constructed as follows: , In the formula, is the steam flow rate released; and are the density of steam inside the steam accumulator at the initial and end time of heat release respectively; and are the densities of water inside the steam accumulator at the initial and final moments of heat release, respectively; It represents the water filling coefficient; Indicates the ratio of the volume of water to the volume of the steam accumulator at the end of heat release; Indicates the energy of steam released; and are the enthalpy values ​​of the steam inside the steam accumulator at the initial and end times of heat release, respectively; is the heat release time step.

[0012] Optionally, during the charging and releasing processes of the steam accumulator, the density and temperature of the saturated steam satisfy the following relationship constraint: , In the formula, Indicates the temperature of saturated steam inside the steam accumulator. Indicates the density of saturated steam inside the steam accumulator; The enthalpy of saturated water and saturated steam and the temperature satisfy the following relationship constraints: , In the formula, Indicates the temperature of saturated water inside the steam accumulator; Indicates the pressure of saturated steam inside the steam accumulator; and Respectively represent the enthalpy values ​​of saturated water and saturated steam inside the steam accumulator; The saturated vapor temperature and saturated pressure satisfy the following relationship: , In the formula, , and They represent the three exponential parameters of the Antoine equation.

[0013] Optionally, in step S2.4, the expression of the steam accumulator equivalent energy storage model constructed is as follows: , In the formula, and Respectively t The flow rate of steam charged into and discharged from the steam accumulator at each moment; and They respectively represent the upper limits of the steam flow rates for charging and discharging steam from the steam accumulator; express t The steam accumulator is always filled with steam. express t The steam accumulator is not charged with steam at all times; express t The steam accumulator is in the state of releasing steam at all times. express t The steam accumulator does not release steam at all times; and Respectively t -1 The enthalpy of steam charged and released at time; and Respectively t -1 The flow rate of steam charged into and discharged from the steam accumulator at time; express t The steam energy stored in the steam accumulator at the moment; and They represent the maximum and minimum values ​​of steam energy that can be stored in the steam accumulator respectively; Indicates the steam energy stored in the steam accumulator at the initial moment; represents the steam energy stored in the steam accumulator at the end of each optimization cycle; Indicates the sampling point time interval.

[0014] Optionally, the expression of the objective function in step S3 is as follows: , In the formula, represents the comprehensive cost; Z is the entire life cycle of the comprehensive energy system, that is, the design life of the equipment; is the total equipment investment cost on day z; is the interaction cost between the microgrid in the park and the upper grid on the zth day; is the total equipment maintenance cost on day z.

[0015] Optionally, the calculation formulas for each cost in the objective function are as follows: , In the formula, r is the discount rate of the equipment; Z is the design life of the equipment; For the k The unit investment planning cost of the equipment; For the k The planned installation capacity of the equipment; M is the number of equipment types in the integrated energy system; and They are t The electricity sales price and electricity purchase price of the microgrid at each moment; for t The interaction power between the microgrid and the upper grid at all times; They are t The cooling capacity and cooling release capacity of the cold storage device at all times; They are the unit operating power maintenance costs of electric boilers, photovoltaic generators, wind turbines, batteries, cold storage, air source heat pumps, industrial steam boilers, steam heat storage and cold air conditioners; They are t The charging power and discharging power of the battery at all times; They are electric boilers, photovoltaic generators, wind turbines, air source heat pumps, industrial steam boilers and air conditioners. t Operating power at all times; and Respectively t The flow rate of steam charged into and discharged from the steam accumulator at each moment. T =24h.

[0016] Optionally, the constraints include: installation capacity planning constraints, upper and lower limit constraints on the operation of each equipment unit, electricity / cold / heat / steam power balance constraints, air source heat pump operation constraints, cold air conditioning operation constraints, battery operation constraints, electric boiler operation constraints, industrial steam boiler operation constraints, cold storage device operation constraints, photovoltaic generator set output constraints and wind generator set output constraints.

[0017] Optionally, the electricity / cooling / heating / steam power balance constraints include: Electric power balance constraints: ; Thermal power balance constraints: ; Cooling and electricity power balance constraints: ; Steam power balance constraints: ; In the formula, for t The interaction power between the microgrid and the upper grid at all times; They are t The charging power and discharging power of the battery at all times; , , , They are t The energy demand for cooling, heating, electricity and steam in the microgrid park during the period; They are electric boilers, photovoltaic generators, wind turbines, air source heat pumps, industrial steam boilers and air conditioners. t Operating power at all times; and are the heating power and cooling power of the air source heat pump at time t respectively; for t The heating power of the electric boiler at each moment; They are t The cooling capacity and cooling release capacity of the cold storage device at all times; for t The heating power of the air source heat pump at all times; Indicates the cooling power of the air conditioner at time t; for t The steam power output of the industrial steam boiler at any moment; for t The steam flow rate charged from the industrial steam boiler to the steam accumulator at the moment, Indicates the enthalpy value of steam charged into the steam accumulator; is the steam flow rate released from the steam accumulator, Indicates the enthalpy of steam released from the steam accumulator. is the time interval between two sampling points.

[0018] Optionally, the step S4 of solving the integrated cooling, heating, electricity, light, storage and charging microgrid park planning model includes: After the objective function is linearized, the commercial solver BARON is called in the GAMS environment to solve it.

[0019] In a second aspect, the present invention provides a microgrid park integrated energy system planning device, which runs the steps of any method described in the first aspect of the present invention, characterized in that the device includes: The data information acquisition module is used to obtain the energy demand data, time-of-use electricity price information, natural gas price, meteorological information and equipment parameters, equipment investment cost and equipment maintenance cost of the park to be planned; The equivalent energy storage modeling module is used to model the equivalent energy storage of the steam heat storage device in the microgrid park based on the energy hub structure of the integrated energy system, taking into account the impact of temperature changes on the thermodynamic characteristics of steam, and considering valley electricity thermal storage; A planning model building module is used to set the constraints of the planning model based on the equivalent energy storage characteristics of the steam accumulator and the acquired data information, and to take the minimum comprehensive cost as the objective function, so as to build a microgrid park planning model that integrates cold, hot, electric, light, storage and charging and considers the complementary multi-energy of electricity and steam; The planning solution module is used to solve the integrated microgrid park planning model of cooling, heating, electricity, light, storage and charging, and output the planning solution of whether each device in the comprehensive energy system is configured, the configured capacity and the operating output curve of each configured device.

[0020] In a third aspect, the present invention provides a terminal, including a processor and a storage medium; The storage medium is used to store instructions; The processor is used to operate according to the instructions to execute the steps of any one of the methods described in the first aspect of the present invention.

[0021] In a fourth aspect, the present invention provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of any one of the methods described in the first aspect of the present invention.

[0022] The beneficial effect of the present invention is that, compared with the prior art, 1. The present invention takes into account the impact of temperature changes on the thermodynamic properties of steam, conducts refined modeling of the equivalent energy storage of the steam accumulator, and deeply explores the coordinated optimization scheduling of electricity and steam, which can achieve more accurate energy management and improve the efficiency of energy flow within the microgrid park. Specifically, the steam accumulator can store excess steam during the trough period of demand and release it during the peak period of demand, thereby balancing load fluctuations. The air source heat pump can efficiently extract heat from the air and improve the heating efficiency. Through the valley charging and high discharge of the steam accumulator and the efficient heat extraction of the air source heat pump, the complex coupling problem between electricity, cold energy, heat energy and steam is solved, breaking through the limitations of traditional energy system planning, reducing dependence on traditional heating methods, and significantly improving the heating efficiency while improving the economy of the microgrid park planning scheme.

[0023] 2. The present invention fully explores the flexible scheduling potential of various energy resources in the park. In addition to integrating conventional energy conversion equipment and energy storage equipment, it also specially considers adding steam heat accumulators and air source heat pumps, and constructs a microgrid park planning model that integrates cold, hot, electric, photovoltaic, storage and charging that considers the multi-energy complementarity of electricity and steam. It can not only realize the effective coupling between electricity and industrial steam, but also optimize resource utilization efficiency while improving system flexibility.

[0024] 3. The experimental results show that the introduction of steam heat accumulators and air source heat pumps in the planning of microgrid parks has significant economic benefits, which not only reduces the overall planning cost of the system, but also optimizes the energy structure of the park and enhances the economy and stability of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a flow chart of the integrated energy system planning method for a microgrid park in the present invention; Figure 2 It is a schematic diagram of the energy hub structure of the comprehensive energy system in the present invention; Figure 3 It is a schematic diagram of typical solar, cold, hot and steam loads in summer in the present invention; Figure 4 It is a schematic diagram of the operation results of the power output of each device and the mutual power transmission between the energy supply and the energy supply in summer in the present invention; Figure 5 This is a schematic diagram of the busbar structure of configuration scheme 2 in the present invention; Figure 6 It is a schematic diagram of the three busbar structure of the configuration scheme in the present invention; Figure 7 It is a structural principle block diagram of the microgrid park integrated energy system planning device of the present invention; DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The embodiments described in the present invention are only part of the embodiments of the present invention, not all of the embodiments. Based on the spirit of the present invention, other embodiments obtained by ordinary technicians in this field without creative work are all within the scope of protection of the present invention.

[0027] Embodiment 1: Reference Figure 1 The embodiment of the present invention provides a method for planning a microgrid park integrated energy system, which specifically includes the following steps: Step S1, obtaining energy demand data, time-of-use electricity price information, natural gas price, meteorological information and equipment parameters, equipment investment cost and equipment maintenance cost of the park to be planned; Step S2: Based on the energy hub structure of the integrated energy system, taking into account the impact of temperature changes on the thermodynamic characteristics of steam, and considering valley electricity thermal storage to model the equivalent energy storage of the steam thermal accumulator of the microgrid park; Step S3, based on the equivalent energy storage characteristics of the steam accumulator, combined with the data information obtained in step S1, setting the constraints of the planning model, and taking the minimum comprehensive cost as the objective function, thereby constructing a microgrid park planning model that integrates cold, hot, electric, photovoltaic, storage and charging and considers the complementary multi-energy of electricity and steam; Step S4, solving the integrated microgrid park planning model for cooling, heating, electricity, light, storage and charging, and outputting a planning scheme for whether each device in the integrated energy system is configured, the configured capacity, and the operating output curve of each configured device.

[0028] Specifically, Figure 2 As shown, it is an energy hub structure diagram of the microgrid park comprehensive energy system of the present invention, which includes one energy input form, four load demands, and multiple multi-energy conversion devices, wherein the equipment includes: industrial steam boilers, steam accumulators, batteries, photovoltaic generator sets, wind turbines, air conditioners, electric boilers, air source heat pumps and cold storage devices.

[0029] In this embodiment, step S2 specifically includes: S2.1. Based on the material balance, hydraulic balance and thermal balance principles in thermodynamics, a mathematical and physical model of the steam accumulator during the charging and discharging process is constructed; the material balance between the water space and the steam space and the balance between hydraulic and thermal forces are as follows: Charging process: , Exothermic process: , In the formula, is the saturated steam quality in the steam space inside the steam accumulator, is the saturated steam enthalpy value in the steam space inside the steam accumulator; is the mass of saturated water in the water space inside the steam accumulator, is the saturated water enthalpy in the water space inside the steam accumulator; is the steam flow rate, is the enthalpy of the charged steam; is the steam flow rate released from the steam accumulator, is the enthalpy of steam released from the steam accumulator; is the flow rate of internal superheated water flashing into steam, It is the steam enthalpy value of internal superheated water flashing into steam; during the charging process of the steam accumulator , during the heat release process of the steam accumulator .

[0030] S2.2. Based on the mathematical and physical model of the charging process, the charging steam flow model and charging steam energy model of the steam accumulator are constructed; the specific process is as follows: S2.2.1. Based on the thermodynamic characteristics of steam, a refined modeling of the steam-liquid two-phase transfer process during the heat charging process is performed; (1) Establish material balance of the charging process: , (2) Establish hydraulic and thermal balance of the heating process: , In the formula, is the steam flow rate charged; is the volume of steam accumulator; is the charging time step; represents the steam pressure, Indicates the steam temperature inside the steam accumulator during the charging process; represents the initial moment of the heating process, where is the volume of water inside the steam accumulator at the initial moment of charging, and are the internal pressure and temperature of the steam accumulator at the initial moment of charging, and are the enthalpy and density of water at the initial moment of heating, and are the enthalpy and density of steam at the initial moment of the charging process. After time, Indicates the end time of the heating process, where is the volume of water at the end of heating, and are the internal pressure and temperature of the steam accumulator at the end of charging, and are the enthalpy and density of the water inside the steam accumulator at the end of charging, and are the enthalpy and density of the steam inside the steam accumulator at the end of charging respectively.

[0031] S2.2.2. Construct the conservation constraint of the ratio of the water space volume to the steam accumulator volume at the beginning and end of charging as follows: , in, It represents the ratio of the volume of water to the volume of the steam accumulator at the initial moment of charging. In this embodiment, the water space at the initial moment of charging the steam accumulator accounts for about 90% of the total volume of the steam accumulator, that is, the water filling coefficient .

[0032] S2.2.3. The volume of water and Substituting the material balance constraint of the heat charging process in step S2.2.1, we can obtain The steam flow rate and steam energy charged at the time are: ,

[0033] In the formula, is the steam flow rate charged; and are the density of steam inside the steam accumulator at the initial and final moments of charging, respectively; and are the water densities inside the steam accumulator at the initial and final moments of charging, respectively. It represents the water filling coefficient; It indicates the ratio of the volume of water to the volume of the steam accumulator at the initial moment of charging; is the volume of the steam accumulator; is the charging time step; Indicates the steam energy charged into the steam accumulator. It is the enthalpy of the steam charged into the steam accumulator.

[0034] To further illustrate, the relationship between saturated steam density and temperature is as follows: ,

[0035] In the formula, Indicates the temperature of saturated steam inside the steam accumulator, °C; Indicates the density of saturated steam inside the steam accumulator, kg / m 3 .

[0036] The relationship between the enthalpy value and temperature of saturated water and saturated steam is as follows: ,

[0037] In the formula, Indicates the temperature of saturated water inside the steam accumulator, °C; Indicates the pressure of saturated steam inside the steam accumulator, MPa; and Represent the enthalpy values ​​of saturated water and saturated steam respectively, kJ / kg.

[0038] From the above constraints on the relationship between saturated steam density and temperature and the relationship between water, saturated steam enthalpy and temperature, we can know that , , , All are based on Therefore, the steam flow rate is related to the temperature and pressure. Since the relationship between the saturated temperature and saturated pressure of water vapor is: ,

[0039] In the formula, , and Respectively represent the three exponential parameters of the Antoine equation. In this embodiment , , Take 9.3876, 3826.36, and 227.68 respectively.

[0040] It can be seen that the steam flow rate It is the temperature A single-valued function, kg / h; the above calculated , , , Steam flow rate and steam energy During the charging process, the steam inlet flow model and the charging steam energy model with temperature as the key factor can be obtained.

[0041] S2.3. Based on the mathematical and physical model of the heat release process, the steam release flow model and steam release energy model of the steam accumulator are constructed; the specific process is as follows: S2.3.1. Based on the thermodynamic characteristics of steam, fine-grained modeling of the steam-liquid two-phase transfer process during heat release; (1) Material balance of exothermic process: ,

[0042] (2) Hydraulic and thermodynamic balance of the exothermic process: ,

[0043] In the formula, is the steam flow rate charged; represents the initial moment of the heat release process, is the volume of water at the initial moment of heat release, and are the pressure and temperature of the steam inside the steam accumulator at the initial moment of heat release, and are the enthalpy and density of water at the initial moment of heat release, and are the thermal enthalpy and density of steam at the initial moment of heat release; After time, represents the end time of the heat release process, where is the volume of water at the end of heat release, and are the pressure and temperature of the steam inside the steam accumulator at the end of heat release, and are the enthalpy and density of water at the end of heat release, and The heat release end time is the thermal enthalpy and density of the steam respectively.

[0044] In this embodiment, the outlet steam flow rate of the heat release process is regarded as a constant value, and the thermal enthalpy of the outlet steam is The average value of the thermal enthalpy at the end time after time.

[0045] S2.3.2. Construct the conservation constraint of the ratio of the water space volume to the steam accumulator volume at the beginning of heat release and the end of heat charging as follows: , in, Indicates the ratio of the volume of water to the volume of the steam accumulator at the end of heat release. In this embodiment, the water space at the beginning of heat release of the steam accumulator accounts for about 90% of the total volume of the steam accumulator, that is, the steam accumulator is filled with water. .

[0046] S2.3.3. The volume of water and Substituting the material balance constraint of the exothermic process in step S2.3.1, we get The steam flow rate and steam energy released at different times are: ,

[0047] In the formula, is the steam flow rate released; and are the densities of steam inside the steam accumulator at the initial and final moments of heat release, respectively; and are the densities of water at the initial and final moments of heat release, respectively; Indicates the water filling coefficient of the steam accumulator; Indicates the ratio of the volume of water to the volume of the steam accumulator at the end of heat release; Indicates the energy of steam released; and are the enthalpy values ​​of the steam inside the steam accumulator at the initial and end times of heat release, respectively; is the heat release time step.

[0048] Similarly, the calculated value of S2.2.3 heat charging process , , , Steam flow rate and steam energy , the steam release flow model and steam release energy model with temperature as the key factor in the heat release process can be obtained.

[0049] S2.4. Considering the relationship between steam flow rate and steam enthalpy value, an equivalent energy storage model of steam accumulator including steam flow rate constraint and steam energy constraint is constructed; specifically including: (1) Steam charging and discharging flow constraints ,

[0050] In the formula, and Respectively t The flow rate of steam charged into and discharged from the steam accumulator at each moment; and They represent the upper limits of the steam flow rates charged into and discharged from the steam accumulator respectively; express t The steam accumulator is always filled with steam. express t The steam accumulator is not charged with steam at all times; express t The steam accumulator is in the state of releasing steam at all times. express t The steam accumulator does not release steam at all times; the steam accumulator cannot be charged and discharged at the same time.

[0051] (2) Steam accumulator capacity constraints Steam accumulator in the t The steam energy stored at any time t -1 moment of stored steam energy and t -1 is related to the state of steam charging and discharging at the moment of discharge. At the same time, the energy stored in the steam accumulator cannot exceed its upper and lower limit constraints. The capacity constraints are as follows: ,

[0052] In the formula, , Respectively t -1 The enthalpy value of steam charging and discharging at time; , Respectivelyt -1 The flow rate of steam charging and discharging at a moment; express t The steam energy stored in the steam accumulator at the moment; , They represent the maximum and minimum values ​​of steam energy that can be stored in the steam accumulator respectively; Indicates the sampling point time interval. .

[0053] (3) Equivalent energy storage model For universal applicability between different optimization cycles, the steam energy stored in the steam accumulator at the end of each optimization cycle is constrained by its initial state, expressed as follows: ,

[0054] In the formula, Indicates the steam energy stored in the steam accumulator at the initial moment; Indicates the steam energy stored in the steam accumulator at the end of each optimization cycle.

[0055] In summary, the equivalent energy storage model of the constructed steam accumulator is as follows: ,

[0056] As an embodiment of the present invention, the expression of the objective function in step S3 is:

[0057] In the formula, represents the comprehensive cost; Z is the entire life cycle of the comprehensive energy system, that is, the design life of the equipment; is the total equipment investment cost on day z; is the interaction cost between the microgrid in the park and the upper grid on the zth day; is the total equipment maintenance cost on day z. The calculation formulas for each cost are as follows: ,

[0058] In the formula, r is the discount rate of the equipment; Z is the design life of the equipment; For the k The unit investment planning cost of the equipment; For the k The planned installation capacity of the equipment; M is the number of equipment types in the integrated energy system; and They are t The electricity sales price and electricity purchase price of the microgrid at each moment; for t The interaction power between the microgrid and the upper grid at all times; They are t The cooling capacity and cooling release capacity of the cold storage device at all times; They are the unit operating power maintenance costs of electric boilers, photovoltaic generators, wind turbines, batteries, cold storage, air source heat pumps, industrial steam boilers, steam heat storage and cold air conditioners; They are t The charging power and discharging power of the battery at all times;---- They are electric boilers, photovoltaic generators, wind turbines, air source heat pumps, industrial steam boilers and air conditioners. t Operating power at all times; and Respectively t The flow rate of steam charged into and discharged from the steam accumulator at each moment. T =24h.

[0059] In this embodiment, the row constraints set in step S3 include: installation capacity planning constraints, upper and lower limit constraints on the operation of each equipment unit, electricity / cold / heat / steam power balance constraints, air source heat pump operation constraints, cold air conditioning operation constraints, battery operation constraints, electric boiler operation constraints, industrial steam boiler operation constraints, cold storage device operation constraints, photovoltaic generator output constraints and wind generator output constraints.

[0060] The installation capacity planning constraints are as follows: ,

[0061] In the formula, , , , , , , , The planned installation capacity is for photovoltaic generator sets, wind turbine generator sets, cold air conditioners, batteries, air source heat pumps, cold storage, industrial steam boilers and steam thermal storage units; The planned installation capacity limits are photovoltaic units, wind turbines, electric boilers, batteries, air source heat pumps, cold storage devices, industrial steam boilers and steam heat storage devices.

[0062] The actual operating output of each unit in the planned year after expansion should not be greater than the sum of the original capacity and the expanded capacity of the unit. That is, in the EH-based operation model, the output upper limit of photovoltaic generator sets, wind turbine generator sets, batteries, cold air conditioning units, heat pump units, cold storage units, industrial steam boiler units and steam heat storage units is coupled with the investment variables of each unit, and the following upper and lower limit constraints of the operation of each equipment unit must be met: ,

[0063] In the formula, for t The battery capacity at all times; for t The power consumption of electric boiler at every moment; for t The power consumption of ASHP unit at the moment; It is the cold storage capacity of the cold storage device. express t The steam energy stored in the steam accumulator at the moment; , , , , , , , It is the original capacity of photovoltaic generator sets, wind turbine generator sets, batteries, cold air conditioners, air source heat pumps, cold energy storage, industrial steam boilers and steam accumulator units.

[0064] Electricity / cooling / heating / steam power balance constraints include: Electric power balance constraint: S ; Thermal power balance constraints: ; Cooling and electricity power balance constraints: ; Steam power balance constraints: ; In the formula, for t The interaction power between the microgrid and the upper grid at all times; They are t The charging power and discharging power of the battery at all times; , , , They are t The cooling, heating, electricity and steam energy demands of the microgrid park at all times; They are electric boilers, photovoltaic generators, wind turbines, air source heat pumps, industrial steam boilers and air conditioners. t Operating power at all times; and are the heating power and cooling power of the air source heat pump at time t respectively; for t The heating power of the electric boiler at each moment; They are t The storage capacity and release capacity of the cold storage device at all times; for t The heating power of the air source heat pump at all times; Indicates the cooling power of the air conditioner at time t; for t The steam power output of the industrial steam boiler at any moment; for t The steam flow rate charged from the industrial steam boiler to the steam accumulator at the moment, Indicates the enthalpy value of steam charged into the steam accumulator; is the steam flow rate released from the steam accumulator, Indicates the enthalpy of steam released from the steam accumulator. is the time interval between two sampling points.

[0065] Air Source Heat Pump (ASHP) Operation Constraints: ,

[0066] In the formula, Indicates the heating coefficient of the air source heat pump; Indicates the cooling coefficient of the air source heat pump; They are t Heat pump heating and cooling power at all times; They are t The heating and cooling operation state variables of the ASHP unit at the moment. , , when cooling , .

[0067] Air conditioning operation constraints: ,

[0068] In the formula, for t Cooling power of air conditioner at all times; For air conditioning refrigeration efficiency; Battery operation constraints: ,

[0069] In the formula, for t The battery capacity at all times; are the charging and discharging efficiency of the battery respectively; They are the upper and lower limits of the battery storage capacity respectively; They are t The battery's charge and discharge state variables at all times. =1, =0; when discharging =0, =1.

[0070] Electric boiler operation constraints: ,

[0071] In the formula, They are t Electricity consumption and heating power of electric boilers at all times; It is the heat energy conversion efficiency of the electric boiler.

[0072] Output constraints of photovoltaic generators and wind turbines: ,

[0073] In the formula, for t The output of photovoltaic units at all times, for t The predicted value of the output of the photovoltaic unit at the moment; for t The output of wind turbines at any given moment, for t The predicted value of the wind turbine output at the moment; this formula indicates that the wind and solar output needs to be within the (0.8,1) interval of the rated output.

[0074] Cold storage operation constraints: ,

[0075] In the formula, Indicates that the cold storage t The cold energy of the moment; Indicates the time interval between sampling points, i.e., energy storage or release time; Respectively t The energy storage and release coefficients at each moment.

[0076] Industrial steam boiler operation constraints: ,

[0077] In the formula, for t The steam energy output by the industrial steam boiler at any moment; for t The steam flow rate output by the industrial steam boiler at any moment; is the enthalpy of vaporization; Indicates the heat production efficiency of industrial steam boilers.

[0078] In step S4 of the embodiment of the present invention, when solving the integrated cooling, heating, electricity, light, storage and charging microgrid park planning model, the objective function is linearized and then the commercial solver BARON is called in the GAMS environment for solution. The linearization process converts the following formula: ,

[0079] Substituting a variable for the absolute value part yields: ,

[0080] In summary, the microgrid park integrated energy system planning method provided by the embodiment of the present invention firstly inputs the electricity price information, reads the typical daily, cold, hot and steam loads, inputs the equipment operation parameters, the steam temperature at the inlet and outlet of the steam accumulator and the corresponding enthalpy value according to the energy hub structure of the integrated energy system of the microgrid park with integrated cooling, heating, electricity and light storage and charging; secondly, based on the material balance, hydraulic balance and thermal balance principles in thermodynamics, constructs a mathematical model of the heat charging and discharging process of the steam accumulator to describe the complex mass and energy flow of the steam and liquid phases in the heat transfer process; considers the influence of temperature changes on the density, pressure and enthalpy value of the steam and liquid phases inside the steam accumulator A method for calculating steam flow and energy in the charging and discharging process is proposed, and an equivalent energy storage model of steam heat accumulator under the influence of temperature is constructed; then, according to the structure and equipment parameters of the microgrid park integrated energy system, constraints are set for the planning model; then, taking the minimum comprehensive cost of the microgrid park integrated energy system as the objective function, considering the equipment operation constraints and the investment payback period constraints, a microgrid park planning model integrating cold, hot, electric, photovoltaic, storage and charging with consideration of the multi-energy complementarity of electricity and steam is established; finally, the commercial solver BARON (a nonlinear optimization solver) is called to solve the above planning model in the GAMS environment to obtain the optimal planning scheme.

[0081] This embodiment is based on Figure 2 The EH structure diagram shown in the figure is used to construct a planning model example; the operating parameters of the microgrid park system are shown in Table 1, the time-of-use electricity price is shown in Table 2, the equipment operating efficiency parameters are shown in Table 3, and the typical daily load in summer is shown in Table 3. Figure 3 shown.

[0082] Table 1 Microgrid Park System Operating Parameters type Initial capacity / kw Unit investment cost / (yuan / kw) Unit maintenance cost / (yuan / kw) Photovoltaic generator set 72 7130 0.0235 Wind turbines 30 5250 0.0235 Cold air conditioning 100 2000 0.003 Air source heat pump 80 1000 0.003 Battery 65 2500 0.018 Steam accumulator 65 3000 0.02 Cold storage 30 2500 0.02 Industrial steam boiler 165 2000 0.016 Table 2 Time-of-use electricity prices Time Electricity purchase / (yuan / (kw·h) Electricity sales / (yuan / (kw·h) Peak hours (11:00-15:00), (20:00-21:00) 0.83 0.65 Normal hours (8:00-10:00), (16:00-18:00), (22:00~23:00) 0.49 0.38 Valley time (1:00-7:00), 24:00 0.17 0.13 Table 3 Equipment operation efficiency parameters parameter Value Electricity-heat conversion efficiency of electric boiler 0.85 Heat pump heating coefficient 4 Heat pump cooling coefficient 3 Battery charge and discharge efficiency 0.9 Thermal energy storage charging and discharging efficiency 0.9 Cold energy storage charging and discharging efficiency 0.9 Industrial steam boiler 0.95 The planning scheme of the integrated energy system of the park is solved by the method of the present invention, and the configuration of the equipment is shown in Table 4; the above planning results are the results of achieving the best economic performance under the constraints of the physical characteristics of various equipment in the system while meeting the energy demand. As can be seen from Table 4, the expansion capacity of photovoltaic units and wind turbines accounts for 66.1% of the total expansion capacity, and the expansion cost accounts for 85.7% of the total expansion cost, so as to meet the low-carbon energy demand of the park.

[0083] Table 4 Results of the park's comprehensive energy system planning Unit Type Expansion capacity / KW Expansion cost / 10,000 yuan Photovoltaic unit 2802.34 1998.07 Wind turbines 4770.26 2504.39 Cold air conditioning unit 88.89 17.78 Battery unit 298.08 29.81 Cold storage unit 55.13 5.51 Air source heat pump unit 411.13 32.89 Steam accumulator unit 1852.54 547.36 Industrial steam boiler units 1176.86 117.69 This embodiment divides a day into 24 periods, and selects a typical summer day to analyze the power balance of the park. The typical summer day load is shown in the figure. The power output of each device in summer and the operation results of the mutual power transmission between the energy supply are shown in the figure. Figure 4 It can be seen that the power supply in the integrated energy system mainly comes from the output power installed in photovoltaic and wind turbines; since the system's power demand is large in summer, when the power demand is too high, the system will purchase from energy suppliers to alleviate the problem of insufficient power supply in the system itself; when the power load is lower than the total power supply of the system, the excess power will be stored, thereby reducing the comprehensive energy cost of the park.

[0084] This embodiment performs planning analysis under different schemes for a typical summer day, as follows: Configuration scheme 1 (method of the present invention): With power grid, photovoltaic and wind power as energy input, the core equipment includes cold air conditioning unit, steam heat storage device, air source heat pump, electric boiler and cold storage device. In addition, batteries are also considered as energy storage equipment. The EH structure diagram is as follows Figure 2 shown.

[0085] Configuration scheme 2: With the power grid, photovoltaic and wind power as energy input, the core equipment is based on configuration scheme 1, with the steam thermal storage device and air source heat pump replaced by traditional gas boiler and CCHP. The configuration bus diagram is as follows: Figure 5 shown.

[0086] Configuration plan 3: With the power grid, photovoltaic and wind power as energy input, the core equipment is based on configuration plan 1 without the air source heat pump and steam thermal storage device. The configuration bus diagram is as follows: Figure 6 shown.

[0087] The costs and benefits of the three configuration schemes are shown in Table 5. As can be seen from the table, the total cost of Scheme 1 of the present invention is relatively low, which is 12,215.77 yuan. Scheme 2 replaces the steam heat storage device and air source heat pump unit with CCHP unit and gas boiler, and the total cost is about 1.74 times that of Scheme 1. Scheme 3 does not consider the air source heat pump and steam heat storage device, so the total cost is also increased, which is about 1.06 times that of Scheme 1. This shows that planning air source heat pumps (ASHP) and steam heat accumulators in microgrid parks has certain economic benefits.

[0088] Table 5 Comparison of cost structure of each configuration scheme Configuration plan 1 Configuration Solution 2 Configuration plan three Total cost (yuan) 12215.77 21252.91 12999.81 Operating cost (yuan) 135.08 3576 3576 Investment cost (yuan) 9708.00 15978.12 8050.10 Maintenance cost (yuan) 2372.69 1860.82 1373.71 The present invention constructs an equivalent energy storage model of the steam accumulator and refines the modeling of the steam storage process to accurately predict and control the steam supply. During the peak period of steam demand, the stored steam is released to meet the demand; and when the demand is low, the excess steam is stored in the accumulator, so as to achieve rational utilization and energy saving. Through the use of air source heat pumps (ASHP) and steam accumulators, large-scale industrial wastewater and waste gas waste heat can be efficiently utilized and converted into steam energy; at the same time, by organically coupling the large-feed and long-delay thermal energy system with the power grid system to achieve real-time electric-heat response, it makes the realization of electric energy substitution in the steam field an economically feasible solution.

[0089] The beneficial effect of the present invention is that, compared with the prior art, 1. The present invention takes into account the impact of temperature changes on the thermodynamic properties of steam, conducts refined modeling of the equivalent energy storage of the steam accumulator, and deeply explores the coordinated optimization scheduling of electricity and steam, which can achieve more accurate energy management and improve the efficiency of energy flow within the microgrid park. Specifically, the steam accumulator can store excess steam during the trough period of demand and release it during the peak period of demand, thereby balancing load fluctuations. The air source heat pump can efficiently extract heat from the air and improve the heating efficiency. Through the valley charging and high discharge of the steam accumulator and the efficient heat extraction of the air source heat pump, the complex coupling problem between electricity, cold energy, heat energy and steam is solved, breaking through the limitations of traditional energy system planning, reducing dependence on traditional heating methods, and significantly improving the heating efficiency while improving the economy of the microgrid park planning scheme.

[0090] 2. The present invention fully explores the flexible scheduling potential of various energy resources in the park. In addition to integrating conventional energy conversion equipment and energy storage equipment, it also specially considers adding steam heat accumulators and air source heat pumps, and constructs a microgrid park planning model that integrates cold, hot, electric, photovoltaic, storage and charging that considers the multi-energy complementarity of electricity and steam. It can not only realize the effective coupling between electricity and industrial steam, but also optimize resource utilization efficiency while improving system flexibility.

[0091] 3. The experimental results show that the introduction of steam heat accumulators and air source heat pumps in the planning of microgrid parks has significant economic benefits, which not only reduces the overall planning cost of the system, but also optimizes the energy structure of the park and enhances the economy and stability of the system.

[0092] Embodiment 2: like Figure 7 As shown, the present invention provides a microgrid park integrated energy system planning device, which is used to implement the steps of the method in the above embodiment 1, and the device specifically includes: The data information acquisition module is used to obtain the energy demand data, time-of-use electricity price information, natural gas price, meteorological information and equipment parameters, equipment investment cost and equipment maintenance cost of the park to be planned; The equivalent energy storage modeling module is used to model the equivalent energy storage of the steam heat storage device in the microgrid park based on the energy hub structure of the integrated energy system, taking into account the impact of temperature changes on the thermodynamic characteristics of steam, and considering valley electricity thermal storage; A planning model building module is used to set the constraints of the planning model based on the equivalent energy storage characteristics of the steam accumulator and the acquired data information, and to take the minimum comprehensive cost as the objective function, so as to build a microgrid park planning model that integrates cold, hot, electric, light, storage and charging and considers the complementary multi-energy of electricity and steam; The planning solution module is used to solve the integrated microgrid park planning model of cooling, heating, electricity, light, storage and charging, and output the planning solution of whether each device in the comprehensive energy system is configured, the configured capacity and the operating output curve of each configured device.

[0093] The microgrid park integrated energy system planning device provided in the embodiment of the present invention and the microgrid park integrated energy system planning method provided in Example 1 are based on the same technical concept, and can produce the beneficial effects as described in Example 1. For the contents not described in detail in this embodiment, please refer to Example 1.

[0094] Embodiment three: An embodiment of the present invention provides a terminal, including a processor and a storage medium; The storage medium is used to store instructions; The processor is used to operate according to the instruction to execute the steps of the method according to any one of the embodiments.

[0095] Embodiment 4: An embodiment of the present invention provides a computer-readable storage medium, on which a computer program is stored. When the program is executed by a processor, the steps of any method described in Embodiment 1 are implemented.

[0096] The present invention may be a system, a method and / or a computer program product. The computer program product may include a computer-readable storage medium carrying computer-readable program instructions for causing a processor to implement various aspects of the present invention.

[0097] A computer-readable storage medium may be a tangible device that can hold and store instructions used by an instruction execution device. A computer-readable storage medium may be, for example, but not limited to, an electrical storage device, a magnetic storage device, an optical storage device, an electromagnetic storage device, a semiconductor storage device, or any suitable combination of the above. More specific examples (a non-exhaustive list) of computer-readable storage media include: a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), a static random access memory (SRAM), a portable compact disk read-only memory (CD-ROM), a digital versatile disk (DVD), a memory stick, a floppy disk, a mechanical encoding device, such as a punch card or a raised structure in a groove on which instructions are stored, and any suitable combination of the above. The computer-readable storage medium used herein is not to be interpreted as a transient signal itself, such as a radio wave or other freely propagating electromagnetic wave, an electromagnetic wave propagating through a waveguide or other transmission medium (e.g., a light pulse through a fiber optic cable), or an electrical signal transmitted through a wire.

[0098] The computer-readable program instructions described herein can be downloaded from a computer-readable storage medium to each computing / processing device, or downloaded to an external computer or external storage device via a network, such as the Internet, a local area network, a wide area network, and / or a wireless network. The network can include copper transmission cables, optical fiber transmissions, wireless transmissions, routers, firewalls, switches, gateway computers, and / or edge servers. The network adapter card or network interface in each computing / processing device receives the computer-readable program instructions from the network and forwards the computer-readable program instructions for storage in the computer-readable storage medium in each computing / processing device.

[0099] The computer program instructions for performing the operation of the present invention may be assembly instructions, instruction set architecture (ISA) instructions, machine instructions, machine-dependent instructions, microcode, firmware instructions, state setting data, or source code or object code written in any combination of one or more programming languages, including object-oriented programming languages, such as Smalltalk, C++, etc., and conventional procedural programming languages, such as "C" language or similar programming languages. The computer-readable program instructions may be executed entirely on the user's computer, partially on the user's computer, as a separate software package, partially on the user's computer, partially on a remote computer, or entirely on a remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (e.g., using an Internet service provider to connect through the Internet). In some embodiments, by using the state information of the computer-readable program instructions to personalize an electronic circuit, such as a programmable logic circuit, a field programmable gate array (FPGA), or a programmable logic array (PLA), the electronic circuit may execute the computer-readable program instructions, thereby implementing various aspects of the present invention.

[0100] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents, and any modifications or equivalent replacements that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A method for planning a microgrid park integrated energy system, characterized in that: Methods include: Step S1, obtaining energy demand data, time-of-use electricity price information, natural gas price, meteorological information and equipment parameters, equipment investment cost and equipment maintenance cost of the park to be planned; Step S2: Based on the energy hub structure of the integrated energy system, taking into account the impact of temperature changes on the thermodynamic characteristics of steam, and considering valley electricity thermal storage to model the equivalent energy storage of the steam thermal accumulator of the microgrid park; Step S3, based on the equivalent energy storage characteristics of the steam accumulator, combined with the data information obtained in step S1, setting the constraints of the planning model, and taking the minimum comprehensive cost as the objective function, thereby constructing a microgrid park planning model that integrates cold, hot, electric, photovoltaic, storage and charging and considers the complementary multi-energy of electricity and steam; Step S4, solving the integrated microgrid park planning model for cooling, heating, electricity, light, storage and charging, and outputting a planning scheme for whether each device in the integrated energy system is configured, the configured capacity, and the operating output curve of each configured device.

2. The microgrid park integrated energy system planning method according to claim 1 is characterized in that: The equipment in the comprehensive energy system includes: industrial steam boiler, steam accumulator, battery, photovoltaic generator set, wind generator set, air conditioner, electric boiler, air source heat pump and / or cold accumulator.

3. The microgrid park integrated energy system planning method according to claim 1 is characterized in that: The step S2 specifically includes: S2.

1. Based on the material balance, hydraulic balance and thermal balance principles in thermodynamics, a mathematical and physical model of the steam accumulator during the charging and discharging process is constructed. S2.

2. Based on the mathematical and physical model of the charging process, a charging steam flow model and a charging steam energy model of the steam accumulator are constructed; S2.

3. Based on the mathematical and physical model of the heat release process, a steam release flow model and a steam release energy model of the steam accumulator are constructed; S2.

4. Taking into account the relationship between steam flow and steam enthalpy, an equivalent energy storage model of a steam accumulator including steam flow constraints and steam energy constraints is constructed.

4. The microgrid park integrated energy system planning method according to claim 3 is characterized in that: In step S2.2, the expressions of the charging steam flow model and the charging steam energy model are constructed as follows: , In the formula, is the steam flow rate charged; and are the density of steam inside the steam accumulator at the initial and final moments of charging, respectively; and are the densities of water inside the steam accumulator at the initial and final moments of charging, respectively; It represents the water filling coefficient; It indicates the ratio of the volume of water to the volume of the steam accumulator at the initial moment of charging; is the volume of the steam accumulator; is the charging time step; Indicates the steam energy charged, is the thermal enthalpy of steam charged into the steam accumulator.

5. The microgrid park integrated energy system planning method according to claim 4 is characterized in that: In step S2.3, the expressions of the released steam flow model and released steam energy model are constructed as follows: ， In the formula, is the steam flow rate released; and are the densities of steam inside the steam accumulator at the initial and final moments of heat release, respectively; and are the densities of water inside the steam accumulator at the initial and final moments of heat release, respectively; It represents the water filling coefficient; Indicates the ratio of the volume of water to the volume of the steam accumulator at the end of heat release; Indicates the energy of steam released; and are the enthalpy values ​​of the steam inside the steam accumulator at the initial and end times of heat release, respectively; is the heat release time step.

6. The microgrid park integrated energy system planning method according to claim 5 is characterized in that: During the charging and discharging processes of the steam accumulator, the density and temperature of the saturated steam satisfy the following relationship constraints: , In the formula, Indicates the temperature of saturated steam inside the steam accumulator. Indicates the density of saturated steam inside the steam accumulator; The enthalpy of saturated water and saturated steam and the temperature satisfy the following relationship constraints: , In the formula, Indicates the temperature of saturated water inside the steam accumulator; Indicates the pressure of saturated steam inside the steam accumulator; and They represent the enthalpy values ​​of saturated water and saturated steam inside the steam accumulator respectively; The saturated vapor temperature and saturated pressure satisfy the following relationship: , In the formula, , and They represent the three exponential parameters of the Antoine equation.

7. The microgrid park integrated energy system planning method according to claim 6 is characterized in that: In step S2.4, the expression of the constructed steam accumulator equivalent energy storage model is as follows: ， In the formula, and Respectively t The flow rate of steam charged into and discharged from the steam accumulator at each moment; and They respectively represent the upper limits of the steam flow rates for charging and discharging steam from the steam accumulator; express t The steam accumulator is always filled with steam. express t The steam accumulator is not charged with steam at all times; express t The steam accumulator is in the state of releasing steam at all times. express t The steam accumulator does not release steam at all times; and Respectively t -1 The enthalpy of steam charged and released at time; and Respectively t -1 The flow rate of steam charged into and discharged from the steam accumulator at time; express t The steam energy stored in the steam accumulator at the moment; and They represent the maximum and minimum values ​​of steam energy that can be stored in the steam accumulator respectively; Indicates the steam energy stored in the steam accumulator at the initial moment; represents the steam energy stored in the steam accumulator at the end of each optimization cycle; Indicates the sampling point time interval.

8. The microgrid park integrated energy system planning method according to claim 1, characterized in that: The expression of the objective function in step S3 is as follows: , In the formula, represents the comprehensive cost; Z is the entire life cycle of the comprehensive energy system, that is, the design life of the equipment; is the total equipment investment cost on day z; is the interaction cost between the microgrid in the park and the upper grid on the zth day; is the total equipment maintenance cost on day z.

9. The method for planning a microgrid park integrated energy system according to claim 8, characterized in that: The calculation formulas for each cost in the objective function are as follows: , In the formula, r is the discount rate of the equipment; Z is the design life of the equipment; For the k The unit investment planning cost of the equipment; For the k The planned installation capacity of the equipment; M is the number of equipment types in the integrated energy system; and They are t The electricity sales price and electricity purchase price of the microgrid at each moment; for t The interaction power between the microgrid and the upper grid at all times; They are t The storage capacity and release capacity of the cold storage device at all times; They are the unit operating power maintenance costs of electric boilers, photovoltaic generators, wind turbines, batteries, cold storage, air source heat pumps, industrial steam boilers, steam heat storage and cold air conditioners; They are t The charging power and discharging power of the battery at all times; They are electric boilers, photovoltaic generators, wind turbines, air source heat pumps, industrial steam boilers and air conditioners. t Operating power at all times; and Respectively t The flow rate of steam charged into and discharged from the steam accumulator at each moment. T =24h.

10. The microgrid park integrated energy system planning method according to claim 1, characterized in that: The constraints include: installation capacity planning constraints, upper and lower limit constraints for the operation of each equipment unit, electricity / cold / heat / steam power balance constraints, air source heat pump operation constraints, cold air conditioning operation constraints, battery operation constraints, electric boiler operation constraints, industrial steam boiler operation constraints, cold storage device operation constraints, photovoltaic generator output constraints and wind generator output constraints.

11. The microgrid park integrated energy system planning method according to claim 10, characterized in that: The electricity / cooling / heating / steam power balance constraints include: Electric power balance constraints: ; Thermal power balance constraints: ; Cooling and electricity power balance constraints: ; Steam power balance constraints: ; In the formula, for t The interaction power between the microgrid and the upper grid at all times; They are t The charging power and discharging power of the battery at all times; , , , They are t The energy demand for cooling, heating, electricity and steam in the microgrid park during the period; They are electric boilers, photovoltaic generators, wind turbines, air source heat pumps, industrial steam boilers and air conditioners. t Operating power at all times; and are the heating power and cooling power of the air source heat pump at time t respectively; for t The heating power of the electric boiler at each moment; They are t The cooling capacity and cooling release capacity of the cold storage device at all times; for t The heating power of the air source heat pump at all times; Indicates the cooling power of the air conditioner at time t; for t The steam power output of the industrial steam boiler at any moment; for t The steam flow rate charged from the industrial steam boiler to the steam accumulator at the moment, Indicates the enthalpy value of steam charged into the steam accumulator; is the steam flow rate released from the steam accumulator, Indicates the enthalpy of steam released from the steam accumulator. is the time interval between two sampling points.

12. The microgrid park integrated energy system planning method according to claim 1, characterized in that: The step S4 of solving the integrated cooling, heating, electricity, light, storage and charging microgrid park planning model includes: After the objective function is linearized, the commercial solver BARON is called in the GAMS environment to solve it.

13. A microgrid park integrated energy system planning device, running the microgrid park integrated energy system planning method according to any one of claims 1 to 12, characterized in that: The device includes: The data information acquisition module is used to obtain the energy demand data, time-of-use electricity price information, natural gas price, meteorological information and equipment parameters, equipment investment cost and equipment maintenance cost of the park to be planned; The equivalent energy storage modeling module is used to model the equivalent energy storage of the steam heat storage device in the microgrid park based on the energy hub structure of the integrated energy system, taking into account the impact of temperature changes on the thermodynamic characteristics of steam, and considering valley electricity thermal storage; A planning model building module is used to set the constraints of the planning model based on the equivalent energy storage characteristics of the steam accumulator and the acquired data information, and to take the minimum comprehensive cost as the objective function, so as to build a microgrid park planning model that integrates cold, hot, electric, light, storage and charging and considers the complementary multi-energy of electricity and steam; The planning solution module is used to solve the integrated microgrid park planning model of cooling, heating, electricity, light, storage and charging, and output the planning solution of whether each device in the comprehensive energy system is configured, the configured capacity and the operating output curve of each configured device.

14. A terminal comprising a processor and a storage medium; characterized in that: The storage medium is used to store instructions; The processor is configured to operate according to the instructions to execute the steps of the method according to any one of claims 1-11.

15. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the steps of the method according to any one of claims 1 to 12 are implemented.

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