An electric-thermal-hydrogen coupled integrated energy system, dispatching method and dispatching system

Abstract

The present invention discloses an electric-thermal-hydrogen coupled integrated energy system, a dispatching method and a dispatching system, and relates to the field of integrated energy dispatching technology. The integrated energy system comprises: a power supply module, an electric boiler, a heat storage tank, a gas boiler, a cogeneration unit and a hydrogen energy storage system; the power supply module is connected to an electric load through a microgrid; the electric boiler, the heat storage tank, the gas boiler and the cogeneration unit are connected in sequence; the electric boiler and the cogeneration unit are both connected to the microgrid; the electric boiler is also connected to a thermal load; the cogeneration unit is also connected to the heat storage tank; the hydrogen energy storage system is respectively connected to the electric load, the hydrogen load and the thermal load. The present invention can apply the electric-thermal-hydrogen coupling method to the integrated energy system, and take its economy and wind and solar utilization rate as optimization targets to achieve flexible dispatching of multiple energy supplies.

Description

Technical Field

[0001] The present invention relates to the technical field of integrated energy dispatching, and in particular to an electric-thermal-hydrogen coupled integrated energy system, a dispatching method and a dispatching system. Background Art

[0002] In the context of energy transformation and energy interconnection, as fossil energy is gradually depleted, it also brings about a series of environmental and ecological problems. The development and utilization of renewable energy, such as solar energy and wind energy, to reduce dependence on traditional fossil energy is a major trend in the development of the energy sector, and the comprehensive utilization of various energy sources has also become inevitable. Therefore, building a new modern energy system that is clean, low-carbon, safe, and efficient, and transitioning from a traditional distributed energy system to an integrated energy system has become an inevitable trend in current energy construction and development.

[0003] However, the randomness, volatility and seasonal imbalance of renewable energy power generation will bring about system balance problems. In order to promote the solution of this problem, the power network in the integrated energy system has gradually changed from "source-grid-load" to "source-grid-load-storage". The addition of energy storage system can not only improve the overall energy utilization efficiency of the system, but also ensure energy supply. In the context of current digitalization and energy revolution, IES has become an inevitable choice and a necessary path for energy conservation and carbon reduction. Hydrogen is known as the ultimate energy of the 21st century for its cleanliness and sustainability. Hydrogen energy is integrated into the integrated energy system, and the conversion of hydrogen energy and renewable energy is coordinated. Renewable energy is converted into hydrogen energy and stored in hydrogen storage tanks. Hydrogen energy is converted into electric heat energy through fuel cells. As hydrogen energy storage, it is possible to promote the improvement of renewable energy utilization while reducing carbon emissions. From the perspective of environment and ecology, hydrogen production through renewable energy such as wind power and photovoltaic power can not only obtain truly clean green hydrogen, but also convert and store intermittent and unstable renewable energy into chemical energy, promoting the digestion of new energy electricity.

[0004] In the case of multi-energy complementary integrated energy system, if the system allocation is unreasonable during energy interaction, the operation and maintenance cost of the system will increase significantly, and it will also cause waste and loss of renewable energy, resulting in increased energy supply costs. In the research on the optimization and scheduling of integrated energy systems, particle swarm optimization algorithms, non-dominated sorting elite algorithms, and sparrow algorithms are more common, but they do not have much advantage in optimization speed, and are prone to fall into local optimality, and cannot take into account global exploration. Summary of the invention

[0005] The purpose of the present invention is to provide an electric, thermal and hydrogen coupled integrated energy system, a scheduling method and a scheduling system, which can apply the electric, thermal and hydrogen coupling method to the integrated energy system, and use its economy and wind and solar utilization rate as optimization goals to achieve flexible scheduling of multiple energy supplies.

[0006] To achieve the above object, the present invention provides the following solutions:

[0007] An electric-heat-hydrogen coupled integrated energy system, comprising: a power supply module, an electric boiler, a heat storage tank, a gas boiler, a cogeneration unit and a hydrogen energy storage system;

[0008] The power supply module is connected to the electric load through the microgrid; the electric boiler, the heat storage tank, the gas boiler and the cogeneration unit are connected in sequence; the electric boiler and the cogeneration unit are both connected to the microgrid; the electric boiler is also connected to the thermal load; the cogeneration unit is also connected to the heat storage tank; the hydrogen energy storage system is respectively connected to the electric load, the hydrogen load and the thermal load;

[0009] The power supply module is used to convert light energy and wind energy into electrical energy to supply energy to the electrical load;

[0010] The electric boiler is used to convert electrical energy into thermal energy to provide energy for the thermal load;

[0011] The heat storage tank is used to store thermal energy;

[0012] The gas boiler is used to generate heat energy using natural gas and transmit it to the heat storage tank;

[0013] The cogeneration unit is used to generate heat and electricity using natural gas, and transmit the heat to a heat storage tank, and transmit the electricity to a microgrid;

[0014] Hydrogen energy storage system is used to convert electrical energy into hydrogen energy, store it and supply energy to hydrogen loads.

[0015] Optionally, the power supply module specifically includes: a wind turbine and a photovoltaic panel; the wind turbine and the photovoltaic panel are both connected to the electrical load through a microgrid.

[0016] Optionally, the hydrogen energy storage system specifically comprises: an electrolyzer, a hydrogen storage tank and a fuel cell;

[0017] The electrolyzer, the hydrogen storage tank and the fuel cell are connected in sequence; the electrolyzer is also connected to a microgrid; the hydrogen storage tank is also connected to a hydrogen load; the fuel cell is also connected to a thermal load, and is connected to an electrical load through a microgrid;

[0018] The electrolyzer is used to generate hydrogen energy by electrolysis using electric energy;

[0019] The hydrogen storage tank is used to store hydrogen energy;

[0020] The fuel cell is used to utilize hydrogen energy to supply energy to an electrical load and a thermal load.

[0021] The present invention also provides a scheduling method for an electric-thermal-hydrogen coupled integrated energy system, which is applied to the above-mentioned electric-thermal-hydrogen coupled integrated energy system, comprising:

[0022] Obtain the system's electric heating hydrogen load;

[0023] Obtaining equipment operating parameters according to the system's electric heating hydrogen load;

[0024] According to the equipment operation parameters, the optimization scheduling model and the improved Sooty Tern algorithm, the optimal output result of the electric thermal hydrogen is determined, and the comprehensive energy optimization scheduling is performed according to the optimal output result of the electric thermal hydrogen; the comprehensive energy optimization scheduling is used to control the operation of each device in the electric thermal hydrogen coupled comprehensive energy system;

[0025] Among them, the optimization scheduling model is constructed based on the electric, thermal and hydrogen coupled integrated energy system model, the objective function and the corresponding constraints; the electric, thermal and hydrogen coupled integrated energy system model includes an energy supply model, an energy conversion model and an energy storage model; the improved Sooty Tern algorithm is determined by replacing the fixed migration search step size with a weight dynamic change method.

[0026] Optionally, the objective function includes: an economic objective, an environmental objective and an energy utilization efficiency objective.

[0027] Optionally, the constraints include: power balance constraints, thermal energy balance constraints, hydrogen energy balance constraints, energy storage equipment constraints, energy coupling equipment constraints and energy supply constraints.

[0028] Optionally, the objective function is:

[0029]

[0030] Where F represents the objective function; C gas (t) represents the natural gas purchase cost; C m (t) represents the total operating cost of the system equipment; C p (t) represents the renewable energy discard cost; Represents the cost of carbon emissions.

[0031] The present invention also provides a dispatching system for an electric-thermal-hydrogen coupled integrated energy system, comprising:

[0032] Load acquisition module, used to obtain the system electric heating hydrogen load;

[0033] A parameter determination module, used to obtain equipment operation parameters according to the system electric heating hydrogen load;

[0034] An optimization scheduling module is used to determine the optimal output result of electric thermal hydrogen according to the equipment operation parameters, the optimization scheduling model and the improved Sooty Tern algorithm, and perform comprehensive energy optimization scheduling according to the optimal output result of electric thermal hydrogen; the comprehensive energy optimization scheduling is used to control the operation of each device in the electric thermal hydrogen coupled comprehensive energy system;

[0035] Among them, the optimization scheduling model is constructed based on the electric, thermal and hydrogen coupled integrated energy system model, the objective function and the corresponding constraints; the electric, thermal and hydrogen coupled integrated energy system model includes an energy supply model, an energy conversion model and an energy storage model; the improved Sooty Tern algorithm is determined by replacing the fixed migration search step size with a weight dynamic change method.

[0036] According to the specific embodiments provided by the present invention, the present invention discloses the following technical effects:

[0037] The present invention discloses an electric-thermal-hydrogen coupled integrated energy system, a dispatching method and a dispatching system, wherein the electric-thermal-hydrogen coupled integrated energy system comprises: a power supply module, an electric boiler, a heat storage tank, a gas boiler, a cogeneration unit and a hydrogen energy storage system; the power supply module is connected to an electric load through a microgrid; the electric boiler, the heat storage tank, the gas boiler and the cogeneration unit are connected in sequence; the electric boiler and the cogeneration unit are both connected to the microgrid; the electric boiler is also connected to a heat load; the cogeneration unit is also connected to the heat storage tank; the hydrogen energy storage system is respectively connected to the electric load, the hydrogen load and the heat load. The present invention can apply the electric-thermal-hydrogen coupling method to the integrated energy system, and take its economy and wind and light utilization rate as optimization targets to achieve flexible dispatch of multiple energy supplies. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0039] Figure 1 It is a structural schematic diagram of the electric-thermal-hydrogen coupled integrated energy system of the present invention;

[0040] Figure 2 This is a flowchart of the improved Sooty Tern algorithm in this embodiment;

[0041] Figure 3 Schematic diagram of the scheduling result in this embodiment; wherein, part (a) is a schematic diagram of electric power balance; part (b) is a schematic diagram of thermal power balance; and part (c) is a schematic diagram of hydrogen energy balance. DETAILED DESCRIPTION

[0042] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0043] The purpose of the present invention is to provide an electric, thermal and hydrogen coupled integrated energy system, a scheduling method and a scheduling system, which can apply the electric, thermal and hydrogen coupling method to the integrated energy system, and use its economy and wind and solar utilization rate as optimization goals to achieve flexible scheduling of multiple energy supplies.

[0044] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0045] like Figure 1 As shown, the present invention provides an electric-thermal-hydrogen coupled integrated energy system, including: a power supply module, an electric boiler, a heat storage tank, a gas boiler, a cogeneration unit and a hydrogen energy storage system;

[0046] Among them, the power supply module is connected to the electric load through the microgrid; the electric boiler, the heat storage tank, the gas boiler and the cogeneration unit are connected in sequence; the electric boiler and the cogeneration unit are both connected to the microgrid; the electric boiler is also connected to the thermal load; the cogeneration unit is also connected to the heat storage tank; the hydrogen energy storage system is respectively connected to the electric load, the hydrogen load and the thermal load.

[0047] Specifically, the power supply module is used to convert light energy and wind energy into electrical energy to supply energy to electrical loads; the electric boiler is used to convert electrical energy into thermal energy to supply energy to thermal loads; the heat storage tank is used to store thermal energy; the gas boiler is used to generate thermal energy using natural gas and transmit it to the heat storage tank; the cogeneration unit is used to generate thermal energy and electrical energy using natural gas, and transmit the thermal energy to the heat storage tank, and transmit the electrical energy to the microgrid; the hydrogen energy storage system is used to convert electrical energy into hydrogen energy, store it and supply energy to the hydrogen load.

[0048] As a further implementation scheme, the power supply module specifically includes: a wind turbine and a photovoltaic panel; the wind turbine and the photovoltaic panel are both connected to the electrical load via a microgrid. The hydrogen energy storage system specifically includes: an electrolyzer, a hydrogen storage tank and a fuel cell.

[0049] The electrolyzer, the hydrogen storage tank and the fuel cell are connected in sequence; the electrolyzer is also connected to a microgrid; the hydrogen storage tank is also connected to a hydrogen load; the fuel cell is also connected to a thermal load, and is connected to an electrical load through a microgrid;

[0050] Specifically, the electrolyzer is used to generate hydrogen energy by electrolysis using electrical energy; the hydrogen storage tank is used to store hydrogen energy; and the fuel cell is used to use hydrogen energy to power electrical loads and thermal loads.

[0051] like Figure 1 As shown, the overall structure of the system and the various energy generation, conversion, and storage processes are shown. In the electric, thermal, and hydrogen coupled integrated energy system, natural gas and renewable energy are the main energy sources to meet the three types of loads of the system: electric, thermal, and hydrogen. ETH ) and photovoltaic panels (PV ETH ) as a renewable resource connected to the microgrid, as a green energy support, combined heat and power (CHP ETH )、Gas boiler (GB ETH ), electric boiler (EB ETH ) as energy coupling elements to realize the conversion and utilization of energy in the integrated energy system. The energy storage system includes hydrogen energy storage system (HESS) and thermal energy storage system (TESS), thermal energy storage tank (TES ETH ) As a thermal energy storage system, the hydrogen energy storage system includes an electrolyzer (EL ETH ), hydrogen storage tank (HST ETH ) and fuel cells (FC ETH ), the electrolyzer produces hydrogen and stores the hydrogen in the hydrogen storage tank when the renewable energy generation is sufficient. When the power load is high and the hydrogen load is met, the chemical energy of hydrogen is converted into electrical energy for supplementation through the fuel cell. As a thermal energy storage device, the heat storage tank is supplemented when the heat load is insufficient to reduce the consumption of natural gas. When the heat load is met, the excess heat generated by the combined heat and power and fuel cells is stored. The integrated energy system realizes the conversion and complementary advantages of different energy forms, and improves the utilization rate of renewable energy in the system.

[0052] Based on the above-mentioned electric-thermal-hydrogen coupled integrated energy system, a scheduling method for the electric-thermal-hydrogen coupled integrated energy system includes:

[0053] Step 100: Obtaining the system electric heating hydrogen load;

[0054] Step 200: obtaining equipment operation parameters according to the system electric heating hydrogen load;

[0055] Step 300: Determine the optimal output result of the electric thermal hydrogen according to the equipment operation parameters, the optimization scheduling model and the improved Sooty Tern algorithm, and perform comprehensive energy optimization scheduling according to the optimal output result of the electric thermal hydrogen; the comprehensive energy optimization scheduling is used to control the operation of each device in the electric thermal hydrogen coupled comprehensive energy system;

[0056] Among them, the optimization scheduling model is constructed based on the electric, thermal and hydrogen coupled integrated energy system model, the objective function and the corresponding constraints; the electric, thermal and hydrogen coupled integrated energy system model includes an energy supply model, an energy conversion model and an energy storage model; the improved Sooty Tern algorithm is determined by replacing the fixed migration search step size with a weight dynamic change method.

[0057] Among them, the objective function includes: economic objectives, environmental protection objectives and energy utilization efficiency objectives; the constraints include: power balance constraints, thermal energy balance constraints, hydrogen energy balance constraints, energy storage equipment constraints, energy coupling equipment constraints and energy supply constraints.

[0058] Based on the above technical solution, the following specific steps are provided.

[0059] Step 1: Establish an electric-thermal-hydrogen coupled integrated energy system model, including energy supply model, energy conversion model, and energy storage model, specifically including:

[0060] (1) The output of the fan in the system depends on the instantaneous wind speed, which can be simplified into a linear model for calculation. The formula is as follows:

[0061]

[0062] in, represents the power output of the wind turbine at time t, v in 、v out and v r They represent the access wind speed, cut-off wind speed and rated wind speed respectively, P r is the rated power of the wind turbine.

[0063] (2) Many factors such as light radiation intensity and the radiation conversion efficiency of solar panels will affect photovoltaic power generation. Even more hidden factors such as ambient temperature and humidity will affect photovoltaic power generation efficiency. Focusing on photovoltaic power generation power output, a simplified photovoltaic power generation model is used. Solar cell temperature T c and The power is calculated as follows:

[0064]

[0065]

[0066] Where, Ta Indicates the ambient temperature, G I (t) and G I,ref represents solar irradiance and reference solar irradiance, NOCT represents battery operating temperature (45), P PV,max Indicates the maximum power of the photovoltaic panel, N PV Indicates the number of photovoltaic panels.

[0067] Energy coupling equipment

[0068] (1) Combined heat and power (CHP) ETH )

[0069] The combined heat and power unit is the core component of the energy conversion model and an important device for realizing the electric-heat conversion of the integrated energy system. ETH By consuming natural gas, it provides electricity and heat for the integrated energy system. ETH The power generation is:

[0070]

[0071] Where P CHP (t) represents the electric power output by CHP in time slot t, V CHP (t) represents the amount of natural gas consumed by CHP in time slot t, H NG Indicates the calorific value of natural gas, η CHP Indicates the electrical efficiency of the combined heat and power unit. The heat-to-electricity ratio is a technical and economic indicator of the combined heat and power unit, defined as the ratio of the actual output thermal power of CHP to the electrical power, expressed as:

[0072]

[0073] Where b is the heat-to-electricity ratio of the combined heat and power unit, It represents the heating power of the CHP unit in time slot t.

[0074] (2) Gas boiler (GB ETH )

[0075] GB ETH By burning natural gas to generate heat, chemical energy is converted into thermal energy, which has the advantages of high combustion efficiency and low pollution emissions. In addition, its fast start and stop characteristics make it the first choice for heating equipment in ETH-IES.

[0076]

[0077] In the formula, Indicates GB at time t ETH The thermal output power, Indicates GB at time t ETH Natural gas consumption, Indicates the operating efficiency of the gas boiler, H NG Indicates the calorific value of natural gas.

[0078] (3) Electric boiler (EB ETH )

[0079] Electric boilers consume electrical energy and convert it into heat energy to supply heat load demand. Its mathematical model is expressed as:

[0080]

[0081] In the formula, Indicates the thermal output power of the electric boiler, Indicates the conversion efficiency of electric boiler, Indicates the electrical power consumed by the electric boiler to produce heat.

[0082] Energy storage equipment

[0083] (1) Hydrogen Energy Storage System Operation Model (HESS)

[0084] The hydrogen energy storage system includes an electrolyzer, a hydrogen storage tank and a fuel cell. The electrolyzer consumes electrical energy to produce hydrogen, which is stored in a hydrogen storage tank. The remaining part of the hydrogen load can be converted into energy through the fuel cell, and the hydrogen energy is converted into electrical energy and heat energy and transported to the integrated energy system.

[0085] Hydrogen produced by water electrolysis has a high purity level, less impurity gas, and is easy to combine with renewable energy. It is considered to be the most promising green hydrogen supply method in the future. The electrolyzer performs water electrolysis reaction, converting electricity into hydrogen for storage and providing hydrogen load. The mathematical model of the hydrogen production stage is:

[0086]

[0087]

[0088]

[0089] In the formula, represents the hydrogen molar flow rate of the electrolyzer at time t, Indicates the hydrogen production of the electrolyzer at time t, kg. Indicates the power consumed by the electrolytic cell at time t, LHV H2 Indicates the lower heating value of hydrogen, represents the hydrogen production power of the electrolyzer, represents the hydrogen production efficiency of the electrolyzer, Indicates the electrical power consumed by the electrolyzer to produce hydrogen.

[0090] Hydrogen storage tank

[0091] The hydrogen produced by the electrolyzer is pressurized and stored in a hydrogen storage tank before being supplied to the load and fuel cell. The hydrogen storage tank is a key factor affecting the balance between hydrogen production by electrolysis and hydrogen demand. The hydrogen storage state of the hydrogen tank can be calculated as:

[0092]

[0093]

[0094] In the formula, is the hydrogen storage capacity of the hydrogen storage tank at time t, is the rated capacity of the hydrogen storage tank, kg, SOC HST (t) is the state of the hydrogen storage tank at time t, m HST0 (t) is the initial content of the hydrogen storage tank, m hst,cha (t) and m hst,dis (t) are the amount of hydrogen discharged and filled in the hydrogen storage tank at time t, η hst,cha and η hst,dis They are the charging and decharging efficiencies of the hydrogen storage tank respectively.

[0095] Fuel Cell (FC ETH )

[0096] Hydrogen fuel cells are important coupling components of hydrogen energy storage systems, which can convert the chemical energy in hydrogen into electrical energy and thermal energy. The principle is that hydrogen and oxygen undergo chemical reactions on different electrodes:

[0097]

[0098]

[0099]

[0100]

[0101] In the equation, η FC,e , η FC,h , They represent the electric and thermal output power of the fuel cell, the hydrogen-to-electricity and hydrogen-to-heat conversion efficiency, and the hydrogen consumption power respectively. is the hydrogen molar flow rate of the fuel cell, The amount of hydrogen consumed by the fuel cell.

[0102] (2) Heat storage system

[0103] One of the main components of energy storage systems is thermal energy storage (TES ETH ) system, TES ETH The energy change of is calculated by equation (17),

[0104]

[0105]

[0106] In the formula, represents the thermal storage state of TES at time t, is the total capacity of TES, For TES ETH Net thermal power, positive value indicates storage mode, negative value indicates heat release mode, H TES,cha (t) and H TES,dis (t) represents TES ETH At time t, the amount of heat charged and released is η tes,cha is the charging efficiency, η tes,dis For heat release efficiency.

[0107] Step 2 establishes the constraints of the integrated energy system, including energy balance constraints, equipment safety limit constraints, gas supply constraints, and storage capacity constraints.

[0108] (1) Power balance constraints

[0109]

[0110] In the formula, They represent the power output of photovoltaic, wind turbine, fuel cell and cogeneration at time t, respectively. E-ETH (t) represents the user's power load demand, represents the electric power consumed by the electrolytic cell at time t, Indicates the electrical power consumed by an electric boiler to produce heat.

[0111] (2) Thermal energy balance constraints

[0112]

[0113] In the formula, They represent the thermal power output of gas boiler, fuel cell, cogeneration unit and electric boiler respectively, L R-ETH (t) represents the user's heat load demand, It indicates the heat storage or heat output of the heat storage device. When it is a positive value, the heat storage device is in a heat storage state. When it is a negative value, the heat storage device releases heat to supply the heat load demand.

[0114] (3) Hydrogen energy balance constraints

[0115]

[0116]

[0117] In the formula, m hst,dis (t) and mhst,cha (t) are the amount of hydrogen released from and charged into the hydrogen storage tank, L H-ETH (t) represents the user's hydrogen load demand at time t, Indicates the amount of hydrogen consumed by the fuel cell at time t.

[0118] (4) Energy storage equipment constraints

[0119]

[0120] SOC HST,min ≤SOC HST (t)≤SOC HST,max (twenty four)

[0121] SOC TES,min ≤SOC TES (t)≤SOC TES,max (25)

[0122] Where P EL,max and P EL,min Indicates the maximum and minimum values ​​of the electrolyzer output power, SOC HST,min , SOC HST,max , SOC TES,min , SOC HST,max They are the minimum and maximum values ​​of heat storage and hydrogen storage SOC respectively.

[0123] (5) Energy coupling device constraints

[0124]

[0125]

[0126]

[0127]

[0128] Where P CHP,min , P CHP,max , H CHP,min , H CHP,max is the minimum and maximum value of the electric and thermal power output of the cogeneration unit, H EB,min , H EB,max Indicates the minimum and maximum values ​​of the thermal power output of the electric boiler, H GB,min , H GB,max Indicates the upper and lower limits of the gas boiler's output power.

[0129] (6) Energy supply constraints

[0130] The supply of natural gas in the integrated energy system needs to be purchased from natural gas sources, and the purchase constraints are shown in formula (30):

[0131] V g,min (t)≤V g (t)≤V g,max (t) (30)

[0132]

[0133] Where V g (t) is the total amount of natural gas purchased, V g,min (t) and V g,max (t) is the upper and lower limits of natural gas purchase volume.

[0134] Step 3: Establish the objective function of the electric, thermal and hydrogen coupled integrated energy system, including economic objectives, environmental protection objectives and energy utilization efficiency objectives.

[0135] The optimization operation goal of IES is to reduce economic costs and carbon dioxide emissions while meeting the safe operation constraints of each device in the system and ensuring that the energy storage equipment is within the safe capacity range. The specific optimization goal is shown in formula (32):

[0136]

[0137] Where F represents the objective function; C gas (t) represents the natural gas purchase cost; C m (t) represents the total operating cost of the system equipment; C p (t) represents the renewable energy discard cost; represents the carbon emission cost. gas (t), C m (t), C p (t) They are calculated as:

[0138]

[0139]

[0140]

[0141]

[0142] Step 4: Apply the improved Sooty Tern algorithm to optimize the scheduling of the electric-thermal-hydrogen coupled integrated energy system.

[0143] The Sooty Tern Optimization Algorithm (STOA) is inspired by the foraging behavior of seabirds in nature. It simulates the foraging behavior of sooty terns to solve the problem. It has strong global search capabilities and a relatively simple model. The basic optimization principle is as follows:

[0144] (1) Position migration, which mainly includes three behaviors: avoiding collision, migrating to the optimal direction, and approaching the optimal position.

[0145] 1) Avoid collisions. During migration, prevent collisions between groups of sooty terns:

[0146] C=×P(k) (37)

[0147]

[0148] Among them, C represents the current migration position of the sooty tern without collision, P represents the current position of the individual, represents the no-collision factor, and k represents the number of iterations.

[0149] 2) Migrate to the optimal direction:

[0150] M=λ×(P b (k)-P(k)) (39)

[0151] λ=0.5×β (40)

[0152] Where M represents the current migration location of the sooty tern, P b (k) represents the current position of the individual, λ represents the global adjustment factor, and β is a random number in the range of 0 to 1.

[0153] 3) Close to the optimal location:

[0154] D=C+M (41)

[0155] Where D represents the final migration location of the sooty tern.

[0156] (2) Attack

[0157] When migrating, sooty terns use a circling pattern to change the angle and speed of their attack on prey, searching for prey locally.

[0158]

[0159] P(k)=[D×(x′×y′×z′)]×P b (k) (43)

[0160] Where R is the spiral radius, θ ranges from 0 to 2π, and u and v are hyperparameters.

[0161] However, the traditional Sooty Tern algorithm is prone to the problem of premature convergence in the later stage. In order to reduce the cost of the integrated energy system and improve the utilization rate of renewable energy, the traditional Sooty Tern algorithm is improved:

[0162] The population of the STOA algorithm is initialized with chaos, and the Circle chaotic map is used to improve the convergence speed of the algorithm and complete the initial uniform distribution of the population. The chaotic map is expressed as follows:

[0163]

[0164] Secondly, since the migration search step of the sooty tern is a fixed value, the diversity will be weakened. The adaptive weight method and dynamic weight change can increase the population diversity of the sooty tern, as shown in the following formula:

[0165]

[0166] Therefore, formula (41) is changed to:

[0167] D=ω×C+M (46)

[0168] The specific process of ISTOA application in IES system is as follows: Figure 2 As shown:

[0169] 4.1 First, initialize the input parameters, including the power generated by photovoltaic and wind turbines, the three types of load values ​​of electric, thermal and hydrogen, and the operating parameters of various coupling devices. Set the ISTOA algorithm population size N and the maximum number of iterations k max and α.

[0170] 4.2 Use chaotic mapping to initialize the population, as shown in formula (44), and evaluate the optimal strategy, calculate the fitness function value, and obtain the initial energy storage device storage information and cogeneration equipment output information.

[0171] 4.3 The migration position of the Sooty Terns population is updated according to formulas (37-41) and (46), and the attack position of the Sooty Terns is updated according to formulas (42) and (43).

[0172] 4.4 Re-evaluate the objective function results and update the energy allocation strategy information, storage device storage, and complementary supply of energy coupling devices.

[0173] 4.5 Determine whether the maximum number of iterations is met, and then obtain the best energy scheduling strategy. If so, output the optimal objective function value and energy scheduling result of the integrated energy system, otherwise return to step 4.3 to continue optimizing.

[0174] The present invention establishes an electric-thermal-hydrogen coupled integrated energy system model, which effectively overcomes the problems caused by the uncertainty and unpredictability of renewable energy output, reduces the occurrence of wind and solar power abandonment, makes full use of the coordinated complementarity of various energies, meets the energy needs of various loads of electric-thermal-hydrogen, and reduces the occurrence of a large number of wind, solar and heat abandonment situations, saving the operating cost of the system. The scheduling results are as follows: Figure 3The improved Sooty Tern Algorithm (ISTOA) is used to optimize the energy scheduling of the integrated energy system. The advantages of the Sooty Tern Algorithm are that it has a simple structure and strong global search capability. The use of Circle chaos mapping can effectively improve the convergence speed of the algorithm and complete the initial uniform distribution of the population. The use of the adaptive weight method can increase the diversity of the population and improve the optimization accuracy.

[0175] In addition, the present invention also provides a scheduling system for an electric-thermal-hydrogen coupled integrated energy system, comprising: a load acquisition module, a parameter determination module and an optimization scheduling module.

[0176] Specifically, the load acquisition module is used to obtain the system electric thermal hydrogen load; the parameter determination module is used to obtain the equipment operating parameters according to the system electric thermal hydrogen load; the optimization scheduling module is used to determine the optimal output result of electric thermal hydrogen according to the equipment operating parameters, the optimization scheduling model and the improved Sooty Tern algorithm, and perform comprehensive energy optimization scheduling according to the optimal output result of electric thermal hydrogen; the comprehensive energy optimization scheduling is used to control the operation of each equipment in the electric thermal hydrogen coupled comprehensive energy system; wherein, the optimization scheduling model is constructed according to the electric thermal hydrogen coupled comprehensive energy system model, the objective function and the corresponding constraints; the electric thermal hydrogen coupled comprehensive energy system model includes an energy supply model, an energy conversion model and an energy storage model; the improved Sooty Tern algorithm is determined by replacing the fixed migration search step size with the weight dynamic change method.

[0177] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0178] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the core idea of ​​the present invention. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A scheduling method for an electric-thermal-hydrogen coupled integrated energy system, applied to an electric-thermal-hydrogen coupled integrated energy system, characterized in that: The electric-thermal-hydrogen coupled integrated energy system comprises: a power supply module, an electric boiler, a heat storage tank, a gas boiler, a cogeneration unit and a hydrogen energy storage system; The power supply module is connected to the electric load through the microgrid; the electric boiler, the heat storage tank, the gas boiler and the cogeneration unit are connected in sequence; the electric boiler and the cogeneration unit are both connected to the microgrid; the electric boiler is also connected to the thermal load; the cogeneration unit is also connected to the heat storage tank; the hydrogen energy storage system is respectively connected to the electric load, the hydrogen load and the thermal load; The power supply module is used to convert light energy and wind energy into electrical energy to supply energy to electrical loads; the electric boiler is used to convert electrical energy into thermal energy to supply energy to thermal loads; the heat storage tank is used to store thermal energy; the gas boiler is used to generate thermal energy using natural gas and transmit it to the thermal storage tank; the cogeneration unit is used to generate thermal energy and electrical energy using natural gas, and transmit the thermal energy to the thermal storage tank, and transmit the electrical energy to the microgrid; the hydrogen energy storage system is used to convert electrical energy into hydrogen energy, store it and supply energy to hydrogen loads; The power supply module specifically includes: a wind turbine and a photovoltaic panel; the wind turbine and the photovoltaic panel are both connected to the electrical load through a microgrid; The hydrogen energy storage system specifically includes: an electrolyzer, a hydrogen storage tank and a fuel cell; the electrolyzer, the hydrogen storage tank and the fuel cell are connected in sequence; the electrolyzer is also connected to a microgrid; the hydrogen storage tank is also connected to a hydrogen load; the fuel cell is also connected to a thermal load, and is connected to an electrical load through a microgrid; the electrolyzer is used to generate hydrogen energy by electrolysis using electrical energy; the hydrogen storage tank is used to store hydrogen energy; the fuel cell is used to use hydrogen energy to power the electrical load and the thermal load; The scheduling method of the electric-thermal-hydrogen coupled integrated energy system comprises: Obtain the system's electric heating hydrogen load; Obtaining equipment operating parameters according to the system's electric heating hydrogen load; According to the equipment operating parameters, the optimization scheduling model and the improved Sooty Tern algorithm, the optimal output result of electric thermal hydrogen is determined, and the comprehensive energy optimization scheduling is performed according to the optimal output result of electric thermal hydrogen; the comprehensive energy optimization scheduling is used to control the operation of each device in the electric thermal hydrogen coupled comprehensive energy system; the optimization scheduling model is constructed according to the electric thermal hydrogen coupled comprehensive energy system model, the objective function and the corresponding constraints; the electric thermal hydrogen coupled comprehensive energy system model includes an energy supply model, an energy conversion model and an energy storage model; the improved Sooty Tern algorithm is determined by replacing the fixed migration search step size with a weight dynamic change method; The process of improving the sooty tern algorithm includes: performing chaos initialization on the population of the original sooty tern algorithm, using Circle chaos mapping to complete the initial uniform distribution of the population, and using an adaptive weight method to increase the population diversity of the sooty tern, so that the final migration position of the sooty tern is D=ω×C+M; wherein D represents the final migration position of the sooty tern, ω represents the weight, C represents the current migration position of the sooty tern without collision, and M represents the current migration position of the sooty tern.

2. The dispatching method of the electric-thermal-hydrogen coupled integrated energy system according to claim 1, characterized in that: The objective function includes: economic objective, environmental objective and energy utilization objective.

3. The dispatching method of the electric-thermal-hydrogen coupled integrated energy system according to claim 1, characterized in that: The constraints include: power balance constraints, thermal energy balance constraints, hydrogen energy balance constraints, energy storage equipment constraints, energy coupling equipment constraints and energy supply constraints.

4. The dispatching method of the electric-thermal-hydrogen coupled integrated energy system according to claim 2, characterized in that: The objective function is: Where F represents the objective function; C gas (t) represents the natural gas purchase cost; C m (t) represents the total operating cost of the system equipment; C p (t) represents the renewable energy discard cost; Represents the cost of carbon emissions.

5. A dispatching system for an electric-thermal-hydrogen coupled integrated energy system, applied to the dispatching method for an electric-thermal-hydrogen coupled integrated energy system as claimed in any one of claims 1 to 4, characterized in that: include: Load acquisition module, used to obtain the system electric heating hydrogen load; A parameter determination module, used to obtain equipment operation parameters according to the system electric heating hydrogen load; An optimization scheduling module is used to determine the optimal output result of electric thermal hydrogen according to the equipment operation parameters, the optimization scheduling model and the improved Sooty Tern algorithm, and perform comprehensive energy optimization scheduling according to the optimal output result of electric thermal hydrogen; the comprehensive energy optimization scheduling is used to control the operation of each device in the electric thermal hydrogen coupled comprehensive energy system; Among them, the optimization scheduling model is constructed based on the electric, thermal and hydrogen coupled integrated energy system model, the objective function and the corresponding constraints; the electric, thermal and hydrogen coupled integrated energy system model includes an energy supply model, an energy conversion model and an energy storage model; the improved Sooty Tern algorithm is determined by replacing the fixed migration search step size with a weight dynamic change method.

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