Regional comprehensive energy system

Abstract

The invention discloses a regional comprehensive energy system. The regional comprehensive energy system comprises a multi-energy combined supply system and a control system. The multi-energy combined supply system comprises a regional power grid, a renewable energy power generation system, an energy storage battery, a hydrogen energy storage system and an electric boiler. The hydrogen energy storage system comprises an alkaline electrolytic cell, a buffer tank, a hydrogen compressor, a hydrogen storage tank and a proton exchange membrane fuel cell which are sequentially connected through a hydrogen pipeline, and a hydrogenation terminal connected with the hydrogen storage tank. The control system is configured to determine an objective function, constraint conditions and an operation mathematical model of the multi-energy combined supply system; based on the objective function and the constraint condition, performing optimization solution on the operation mathematical model of the multi-energy combined supply system to obtain a scheduling scheme of the multi-energy combined supply system; and based on the scheduling scheme, performing scheduling control on the operation states of an energy storage cell, an alkaline electrolytic cell, a proton exchange membrane fuel cell and an electric boiler in the multi-energy combined supply system. Therefore, the system operation cost can be remarkably reduced, and economic and stable operation of the system is realized.

Description

Technical Field

[0001] The present application relates to the technical field of comprehensive energy utilization, and in particular to a regional comprehensive energy system. Background Art

[0002] Traditional industrial parks face challenges such as high energy demand, demanding power supply reliability, low energy efficiency, poor economic returns, and severe environmental pollution. While introducing energy storage and waste heat recovery can improve energy efficiency and economic returns, this increases system complexity and complicates optimal scheduling. Summary of the Invention

[0003] In view of the above-mentioned problems existing in the prior art, the present application provides a regional integrated energy system, and the technical solution adopted in the embodiments of the present application is as follows.

[0004] A regional integrated energy system, comprising a multi-energy cogeneration system and a control system;

[0005] The multi-energy cogeneration system includes a regional power grid, a renewable energy power generation system, an energy storage battery, a hydrogen energy storage system and an electric boiler; the regional power grid is connected to the mains power grid, the renewable energy power generation system, the energy storage battery and the power load respectively;

[0006] The hydrogen energy storage system includes an alkaline electrolyzer, a buffer tank, a hydrogen compressor, a hydrogen storage tank, and a proton exchange membrane fuel cell connected in sequence through a hydrogen pipeline, and a hydrogenation terminal connected to the hydrogen storage tank; the alkaline electrolyzer and the proton exchange membrane fuel cell are respectively connected to the regional power grid;

[0007] The electric boiler is connected to the regional power grid, the alkaline electrolyzer, the proton exchange membrane fuel cell and the thermal load respectively. The electric boiler can recover waste heat from the alkaline electrolyzer and the proton exchange membrane fuel cell, and use the recovered heat energy and / or electrical energy to heat the thermal load;

[0008] The control system is configured as follows:

[0009] Determining an objective function for describing the objective of minimizing the operating cost of the multi-energy cogeneration system, constraints for constraining the operating state of the multi-energy cogeneration system, and an operating mathematical model of the multi-energy cogeneration system for characterizing the coupling characteristics of the electric energy, hydrogen energy, and thermal energy of the multi-energy cogeneration system;

[0010] Based on the objective function and the constraints, an operating mathematical model of the multi-energy cogeneration system is optimized and solved to obtain a scheduling plan for the multi-energy cogeneration system; wherein the scheduling plan includes at least the charging power and discharging power of the energy storage battery, the operating power of the alkaline electrolyzer, the net output power of the proton exchange membrane fuel cell, and the operating power of the electric boiler;

[0011] Based on the scheduling scheme, the operating status of the energy storage battery, alkaline electrolyzer, proton exchange membrane fuel cell and electric boiler in the multi-energy cogeneration system is scheduled and controlled to supply power to the electrical load and heat to the thermal load while meeting the goal of minimizing the operating cost of the multi-energy cogeneration system.

[0012] In some embodiments, the operating mathematical model of the multi-energy cogeneration system includes an operating mathematical model of an alkaline electrolyzer, an operating mathematical model of a proton exchange membrane fuel cell, an operating mathematical model of a hydrogen compressor, an operating mathematical model of a hydrogen storage tank, an operating mathematical model of an electric boiler, and an operating mathematical model of an energy storage battery.

[0013] In some embodiments, the mathematical model of the operation of the alkaline electrolysis cell includes:

[0014]

[0015]

[0016]

[0017]

[0018] Among them, U ael is the voltage of the alkaline electrolyzer; is the reversible overvoltage corrected by temperature and pressure; is the ohmic overvoltage; is the activation overvoltage; T is the number of electrolytic cells in series in a bipolar alkaline electrolytic cell; ael is the working temperature of the alkaline electrolytic cell; R is the standard gas constant; F is the Faraday constant; P is the working pressure of the alkaline electrolytic cell; is the water vapor partial pressure; is the activity of water; r1 and r2 are the ohmic overvoltage coefficients; J ael is the working current density; s1, s2, s3, t1, t2, t3 are the activation overvoltage coefficients;

[0019]

[0020]

[0021] in, is the hydrogen production rate of the alkaline electrolyzer, in Nm 3 / h; η F is the Faraday efficiency; I ael is the working current of the alkaline electrolytic cell; a1, a2, a3, a4, and a5 are the Faraday efficiency coefficients;

[0022]

[0023]

[0024] Among them, Q ael is the heat generation power of the alkaline electrolytic cell; U tn is the thermoneutral voltage; A is the active area of ​​the electrode; is the waste heat recovery power of the alkaline electrolyzer; R th is the thermal resistance of the electrolytic cell to the surrounding environment; t am is the ambient temperature; η rec is the waste heat recovery efficiency.

[0025] In some embodiments, the mathematical model of the operation of the proton exchange membrane fuel cell includes:

[0026]

[0027]

[0028]

[0029]

[0030]

[0031] Among them, U fc is the voltage of the proton exchange membrane fuel cell; is the open circuit voltage of the proton exchange membrane fuel cell; The electrode activation overvoltage of the proton exchange membrane fuel cell; is the ohmic overvoltage of the proton exchange membrane fuel cell; is the concentration overvoltage of the proton exchange membrane fuel cell; is the number of monomers in series in the proton exchange membrane fuel cell; T fc is the operating temperature of the proton exchange membrane fuel cell; T0 is the reference temperature under standard conditions; is the hydrogen partial pressure; is the oxygen partial pressure; T fc is the operating current of the proton exchange membrane fuel cell; i fcis the current density of the proton exchange membrane fuel cell, in amperes per square centimeter; ASR is the area specific resistance of the proton exchange membrane fuel cell; f1, f2, f3, and f4 are the activation overvoltage coefficients of the proton exchange membrane fuel cell; m and n are the concentration overvoltage coefficients of the proton exchange membrane fuel cell;

[0032]

[0033] P fc =U fc I fc

[0034] in, is the hydrogen consumption rate of the proton exchange membrane fuel cell, in L / min; The stoichiometric ratio of hydrogen supplied to the proton exchange membrane fuel cell; P fc is the output electrical power of the proton exchange membrane fuel cell;

[0035]

[0036] in, is the auxiliary power consumption of the proton exchange membrane fuel cell; k0, k1, k2, k3, k4, k5 are fitting coefficients;

[0037]

[0038]

[0039] Among them, Q fc is the heat generation power of the proton exchange membrane fuel cell; is the enthalpy of hydrogen entering the proton exchange membrane fuel cell; is the enthalpy of the air entering the proton exchange membrane fuel cell; is the enthalpy of hydrogen discharged from the proton exchange membrane fuel cell; The enthalpy of exhaust air for proton exchange membrane fuel cells; is the enthalpy of water discharged from the anode; is the enthalpy of water discharged from the cathode; Q heat Thermal power consumed for heating the cathode and anode; Q dis is the heat power dissipated to the surrounding environment; is the waste heat recovery power of the proton exchange membrane fuel cell; η rec is the waste heat recovery efficiency.

[0040] In some embodiments, the operation mathematical model of the hydrogen compressor includes:

[0041]

[0042] Among them, Pcomp is the power consumption of the hydrogen compressor; η comp is the efficiency of the hydrogen compressor; ε is the adiabatic index; N gas is the gas flow rate of the hydrogen compressor; T in is the gas temperature entering the hydrogen compressor; P out is the exhaust pressure of the hydrogen compressor; P in is the suction pressure of the hydrogen compressor.

[0043] In some embodiments, the operation mathematical model of the hydrogen storage tank includes:

[0044]

[0045]

[0046] Where SOH is the ratio of the actual working pressure of the hydrogen storage tank to the rated working pressure; k is the time series number; P tank is the actual working pressure of the hydrogen storage tank; P ntank is the rated working pressure of the hydrogen storage tank; T tank is the operating temperature of the hydrogen storage tank; T s is the sampling time step; z is the compressibility factor of hydrogen; is the gas rate entering the hydrogen storage tank; is the gas velocity discharged from the hydrogen storage tank; V tank is the volume of the hydrogen storage tank.

[0047] In some embodiments, the operation mathematical model of the energy storage battery includes:

[0048]

[0049] Among them, SOC is the state of charge value of the energy storage battery; The charging power of the energy storage battery; is the discharge power of the energy storage battery; Q bat is the capacity of the energy storage battery; η bc is the charging efficiency of the energy storage battery; η bd is the discharge efficiency of the energy storage battery.

[0050] In some embodiments, the operation mathematical model of the electric boiler includes:

[0051] Q boiler =η boiler P boiler

[0052] Among them, Q boiler is the heating power of the electric boiler; P boiler is the electric power consumed by the electric boiler; η boiler The efficiency of the electric boiler.

[0053] In some embodiments, the objective function is expressed as:

[0054]

[0055] Where minC represents the operating cost minimization objective of the multi-energy cogeneration system; C grid represents the electricity transaction cost between regional electric power and the city power grid; C HESS represents the use cost of the hydrogen energy storage system; C BESS Represents the cost of using energy storage batteries; C ael_onoff represents the power adjustment penalty of the alkaline electrolyzer; C fc_onoff represents the power adjustment penalty of the proton exchange membrane fuel cell; X is the decision variable; α and β are weight coefficients.

[0056] In some embodiments, the constraints include at least one of hydrogen storage tank constraints, alkaline electrolyzer constraints, proton exchange membrane fuel cell constraints, hydrogen compressor constraints, energy storage battery constraints, electric boiler constraints, regional power grid constraints, energy balance constraints, and scheduling continuity constraints.

[0057] In some embodiments, the constraints of the hydrogen storage tank include:

[0058] SOH min ≤SOH t ≤SOH max

[0059] Among them, SOH t SOH is the ratio of the actual working pressure of the hydrogen storage tank at time t to the rated working pressure; max Indicates the maximum SOH ratio of the hydrogen storage tank; SOH min Represents the minimum SOH ratio of the hydrogen storage tank.

[0060] In some embodiments, the constraints of the alkaline electrolysis cell include:

[0061]

[0062]

[0063]

[0064]

[0065]

[0066] in, and are the minimum allowable operating power and the maximum allowable operating power of the alkaline electrolyzer respectively; is the operating power of the alkaline electrolyzer at time t; is the thermal standby power of the alkaline electrolyzer at time t; is the thermal rated standby power of the alkaline electrolyzer; It is the operating status flag of the alkaline electrolytic cell at time t; is the operating status flag of the proton exchange membrane fuel cell at time t; Represents the operating status flag of the hydrogen refueling terminal at time t; is the discharge status flag of the energy storage battery at time t; and The value of is 0 or 1, 1 represents the working state, and 0 represents the standby state.

[0067] In some embodiments, the constraints of the proton exchange membrane fuel cell include:

[0068]

[0069]

[0070]

[0071]

[0072] in, is the net output power of the proton exchange membrane fuel cell at time t; and are the minimum allowable operating power and maximum allowable operating power of the proton exchange membrane fuel cell respectively; is the operating status flag of the proton exchange membrane fuel cell at time t; Represents the operating status flag of the hydrogen refueling terminal at time t; The power sales status flag of the regional power grid at time t; is the charging status flag of the energy storage battery at time t; The value of is 0 or 1, 1 represents the working state, and 0 represents the standby state.

[0073] In some embodiments, the constraints of the hydrogen compressor include:

[0074]

[0075] in, is the power consumption of the hydrogen compressor at time t; It is the maximum allowable operating power of the hydrogen compressor.

[0076] In some embodiments, the constraints of the energy storage battery include:

[0077]

[0078]

[0079]

[0080]

[0081] SOC min ≤SOC t ≤SOC max

[0082] in, and are the charging power and discharging power of the energy storage battery at time t respectively; and are the maximum charging power and maximum discharging power of the energy storage battery respectively; The charging status flag of the energy storage battery at time t; The discharge status flag of the energy storage battery at time t; The power sales status flag of the regional power grid at time t; and The value of SOC is 0 or 1, 1 represents the working state, and 0 represents the standby state; t SOC is the state of charge of the energy storage battery at time t; min and SOC max They are the minimum and maximum allowable state of charge values ​​of the energy storage battery respectively.

[0083] In some embodiments, the constraints of the electric boiler include:

[0084]

[0085] in, is the operating power of the electric boiler at time t; The maximum allowable operating power of the electric boiler.

[0086] In some embodiments, the constraints of the regional power grid include:

[0087]

[0088]

[0089]

[0090] in, and are the power purchased and sold by the regional power grid to the utility grid at time t; It is the power purchasing status flag of the regional power grid at time t; The power sales status flag of the regional power grid at time t; is the maximum allowable interaction power between the regional power grid and the utility grid.

[0091] In some embodiments, the energy balance constraint condition includes at least one of an electric energy balance constraint condition, a thermal energy balance constraint condition, and a hydrogen energy balance constraint condition;

[0092] The power balance constraints include:

[0093]

[0094] in, is the power generation of the renewable energy power generation system at time t; is the discharge power of the energy storage battery at time t; is the power purchased by the regional power grid from the utility grid at time t; is the net output power of the proton exchange membrane fuel cell at time t; and are the charging power of the energy storage battery at time t respectively; is the operating power of the alkaline electrolyzer at time t; is the operating power of the electric boiler at time t; is the power load at time t; is the power consumption of the hydrogen compressor at time t; is the power sold by the regional power grid to the utility grid at time t; is the thermal standby power of the alkaline electrolyzer at time t;

[0095] The thermal energy balance constraints include:

[0096]

[0097] in, is the waste heat recovery power of the proton exchange membrane fuel cell at time t; is the waste heat recovery power of the alkaline electrolytic cell at time t, is the heating power of the electric boiler at time t; is the thermal load at time t;

[0098] The hydrogen energy balance constraints include:

[0099]

[0100] in, is the change in the hydrogen storage tank's reserves per unit time; is the amount of hydrogen produced per unit time by the alkaline electrolyzer; is the hydrogen consumption per unit time of the proton exchange membrane fuel cell; is the amount of hydrogen added per unit time at the hydrogenation terminal; γ is the loss percentage in the hydrogen purification link.

[0101] In some embodiments, the scheduling continuity constraint condition includes:

[0102] SOC0=SOC 24

[0103] SOH0=SOH 24

[0104] Among them, SOC0 is the state of charge value of the energy storage battery at the initial time of scheduling; SOC 24 is the state of charge value of the energy storage battery at the end of scheduling; SOH0 is the SOH value of the hydrogen storage tank at the initial time of scheduling; SOH 24 is the SOH value of the hydrogen storage tank at the end of scheduling; SOH is the ratio of the actual working pressure of the hydrogen storage tank to the rated working pressure.

[0105] The regional integrated energy system of the embodiment of the present application uses renewable energy to generate electricity through a renewable energy power generation system, which can increase the proportion of green electricity, and can perform off-peak energy storage through energy storage batteries and hydrogen energy storage systems. The hydrogen refueling terminal in the hydrogen energy storage system can be used to refuel hydrogen for example, hydrogen fuel vehicles, and the hydrogen energy storage system can be preheated and recycled through an electric boiler, which can improve the utilization rate of thermal energy. On this basis, the control system optimizes and solves the operating mathematical model of the multi-energy co-generation system based on the objective function and constraints to obtain a scheduling scheme for the multi-energy co-generation system. Based on the scheduling scheme, the operating states of the energy storage battery, alkaline electrolyzer, proton exchange membrane fuel cell and electric boiler of the multi-energy co-generation system are scheduled and controlled, which can not only meet the power supply demand of the power load and the heating demand of the thermal load, but also achieve the goal of minimizing the operating cost of the multi-energy co-generation system, significantly reduce the system operating cost, and achieve economical and stable operation of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0106] Figure 1 This is a system architecture diagram of a multi-energy cogeneration system in a regional integrated energy system according to an embodiment of the present application.

[0107] Figure 2 This is a control flow chart of the control system of the regional integrated energy system according to an embodiment of the present application. DETAILED DESCRIPTION

[0108] Various aspects and features of the present application are described herein with reference to the accompanying drawings.

[0109] It should be understood that various modifications may be made to the embodiments of the present application. Therefore, the above description should not be considered as limiting, but merely as an example of an embodiment. Other modifications within the scope and spirit of the present application will occur to those skilled in the art.

[0110] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the present application and, together with the general description of the present application given above and the detailed description of the embodiments given below, serve to explain the principles of the present application.

[0111] These and other characteristics of the present application will become apparent from the following description of a preferred form of embodiment given as a non-limiting example with reference to the accompanying drawings.

[0112] It should also be understood that although the present application has been described with reference to some specific examples, those skilled in the art will be able to determine that many other equivalent forms of the present application are within the scope of protection defined by the present application.

[0113] The above and other aspects, features and advantages of the present application will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.

[0114] Specific embodiments of the present application will be described hereinafter with reference to the accompanying drawings; however, it should be understood that the embodiments described are merely examples of the present application and may be implemented in a variety of ways. Familiar and / or repetitive functions and structures are not described in detail to avoid obscuring the present application with unnecessary or redundant details. Therefore, the specific structural and functional details described herein are not intended to be limiting, but rather serve merely as a basis and representative basis for the claims to teach those skilled in the art to variously utilize the present application with substantially any suitable detailed structure.

[0115] This specification may use the phrases "in one embodiment," "in another embodiment," "in yet another embodiment," or "in other embodiments," which may all refer to one or more of the same or different embodiments according to the present application.

[0116] An embodiment of the present application provides a regional integrated energy system, which is used to supply electricity, heat and hydrogen energy to a target area. The target area may include a relatively large area, for example, the target area may include an industrial park. The target area may also include a relatively small area, for example, the target area may include one or more office buildings. The target area may have an electrical load 161 and a thermal load 162, and the electrical load 161 may include various electrical equipment in the target area, and the thermal load 162 includes but is not limited to heating equipment, equipment for supplying hot air, and equipment for supplying hot water, etc.

[0117] The regional integrated energy system of the embodiment of the present application includes a multi-energy cogeneration system 100 and a control system. Figure 1 This is a system architecture diagram of the multi-energy cogeneration system in the regional integrated energy system of the embodiment of the present application, see Figure 1 As shown, the multi-energy cogeneration system includes a regional power grid 110, a renewable energy power generation system 121, an energy storage battery 131, a hydrogen energy storage system and an electric boiler 151.

[0118] The regional power grid 110 is connected to the mains power grid 200, the renewable energy generation system 121, the energy storage battery 131, and the power load 161. Specifically, the regional power grid 110 is the power network within the target area, and the mains power grid 200 can be a city grid, a city grid, or a rural grid. The regional power grid 110 can draw power from the mains power grid and sell power to the mains power grid 200. Optionally, the regional power grid 110 can be connected to the mains power grid 200 via a transformer 201.

[0119] The renewable energy power generation system 121 may include at least one of a solar power generation system, a wind power generation system, a geothermal power generation system, a hydropower generation system, an ocean power generation system, and a biomass power generation system, and the specific configuration may be determined based on the local renewable energy conditions in the target area. For example, if the target area has a large number of sunny days per year and abundant solar energy resources, a solar power generation system may be installed. For another example, if the target area has abundant wind resources, a wind power generation system may be installed. For another example, if the target area is located along the coast and ocean energy is suitable for development and utilization, an ocean power generation system may be installed. Optionally, the renewable energy power generation system 121 may be connected to the regional power grid 110 via a first converter 122.

[0120] The energy storage battery 131 is a battery system for storing electrical energy. The energy storage battery 131 draws electricity from the regional power grid 110 to charge itself, and can also use its stored electrical energy to power the regional power grid 110. For example, when there is surplus electrical energy generated by the renewable energy generation system 121, the energy storage battery 131 can be charged. Alternatively, when the commercial power grid 200 adopts a floating electricity price mechanism, the energy storage battery 131 can be charged when the electricity price is low. Conversely, the energy storage battery 131 can be used to power the regional power grid 110. Optionally, the energy storage battery 131 can be connected to the regional power grid 110 via a second converter 132.

[0121] The hydrogen energy storage system includes an alkaline electrolyzer 142, a buffer tank 143, a hydrogen compressor 144, a hydrogen storage tank 145, and a proton exchange membrane fuel cell 147 (PEMFC), which are sequentially connected via a hydrogen pipeline, and a hydrogen refueling terminal 146 connected to the hydrogen storage tank 145. The alkaline electrolyzer 142 and the PEM fuel cell 147 are respectively connected to the regional power grid 110. Optionally, the alkaline electrolyzer 142 can be connected to the regional power grid 110 via a third converter 141, and the PEM fuel cell 147 can be connected to the regional power grid 110 via a fourth converter 148.

[0122] The alkaline electrolyzer 142 can draw electricity from the regional power grid 110 via the third converter 141 and produce hydrogen by electrolyzing water. The alkaline electrolyzer 142 also generates heat during the hydrogen production process. The buffer tank 143 can be connected to the alkaline electrolyzer 142 and the hydrogen compressor 144 via hydrogen pipelines. The buffer tank 143 can stably transport the hydrogen produced by the alkaline electrolyzer 142 to the hydrogen compressor 144. The hydrogen compressor 144 generates high-pressure hydrogen and stores it in the hydrogen storage tank 145, thereby achieving hydrogen energy storage. During use, the proton exchange membrane fuel cell 147 can use hydrogen as fuel to generate electricity, and power can be supplied to the regional power grid 110 via the fourth converter 148. The proton exchange membrane fuel cell 147 also generates heat during the power generation process. Hydrogen can also be refueled to hydrogen-using equipment via the hydrogen refueling terminal 146. For example, hydrogen can be refueled to hydrogen fuel vehicles at a hydrogen refueling station.

[0123] The electric boiler 151 is connected to the regional power grid 110, the alkaline electrolyzer 142, the proton exchange membrane fuel cell 147, and the thermal load 162, respectively. The electric boiler 151 can recover waste heat from the alkaline electrolyzer 142 and the proton exchange membrane fuel cell 147, and use the recovered heat and / or electricity to heat the thermal load 162. Optionally, the electric boiler 151 can be connected to the alkaline electrolyzer 142 and the proton exchange membrane through a waste heat recovery system 152, and recover and utilize the waste heat generated by the alkaline electrolyzer 142 and the proton exchange membrane through methods such as heat exchange. When the recovered heat cannot meet the heat demand of the thermal load 162, the electric boiler 151 can also use electricity to heat the thermal load 162.

[0124] Figure 2 This is a control flow chart of the control system of the regional integrated energy system of the embodiment of the present application, see Figure 2 As shown, the control system of the embodiment of the present application can perform scheduling control on the multi-energy cogeneration system based on the following control logic.

[0125] S301, determining an objective function for describing the objective of minimizing the operating cost of the multi-energy cogeneration system, constraints for constraining the operating state of the multi-energy cogeneration system, and an operating mathematical model of the multi-energy cogeneration system for characterizing the coupling characteristics of the electric energy, hydrogen energy and thermal energy of the multi-energy cogeneration system.

[0126] S302: Based on the objective function and the constraints, an operation mathematical model of the multi-energy cogeneration system is optimized and solved to obtain a scheduling plan for the multi-energy cogeneration system. The scheduling plan includes at least the charging power and discharging power of the energy storage battery 131, the operating power of the alkaline electrolyzer 142, the net output power of the proton exchange membrane fuel cell 147, and the operating power of the electric boiler 151.

[0127] S303, based on the scheduling scheme, the operating status of the energy storage battery 131, the alkaline electrolyzer 142, the proton exchange membrane fuel cell 147 and the electric boiler 151 in the multi-energy cogeneration system is scheduled and controlled to supply power to the electrical load 161 and heat to the thermal load 162 while meeting the goal of minimizing the operating cost of the multi-energy cogeneration system.

[0128] Optionally, the main equipment of the multi-energy cogeneration system can be predetermined, the coupling characteristics of electricity, hydrogen, and heat in the multi-energy cogeneration system can be analyzed, and a mathematical model of the multi-energy cogeneration system operation can be constructed to characterize the coupling characteristics of electricity, hydrogen, and heat in the multi-energy cogeneration system. An objective function can be constructed to describe the minimization of the operating cost of the multi-energy cogeneration system. Constraints can also be constructed based on the operating characteristics of the multi-energy cogeneration system and the energy conservation relationship of the multi-energy cogeneration system to constrain the operating state of the multi-energy cogeneration system.

[0129] Taking the day-ahead scheduling of the multi-energy cogeneration system as an example, a pre-established day-ahead scheduling strategy can be obtained, and based on the day-ahead scheduling strategy and the coupling characteristics of electricity, hydrogen energy and thermal energy in the multi-energy cogeneration system, an operation mathematical model of the multi-energy cogeneration system is constructed.

[0130] Optionally, when the objective function, the constraints and the operating mathematical model of the multi-energy cogeneration system are determined, an optimization solution algorithm may be used to solve the operating mathematical model of the multi-energy cogeneration system to obtain the scheduling plan.

[0131] Exemplarily, the state of charge (SOC) of the energy storage battery 131 at the initial moment of scheduling and the SOH value of the hydrogen storage tank 145 at the termination moment of scheduling can be obtained, and the SOH is the ratio of the actual working pressure of the hydrogen storage tank 145 to the rated working pressure. In addition, the daily power generation forecast value of the renewable energy power generation system 121, the daily power load forecast value of the power load 161, the thermal load forecast value of the thermal load 162, the daily electricity price parameters, the equipment parameters of the alkaline electrolyzer 142, the equipment parameters of the proton exchange membrane fuel cell 147, etc. can also be obtained. The above data including the SOC value and the SOH value are input into the operation mathematical model of the multi-energy cogeneration system. Based on the mixed integer quadratic programming method, the operation mathematical model of the multi-energy cogeneration system is optimized and solved to obtain the day-ahead scheduling plan. The day-ahead scheduling plan can be the scheduling plan of the multi-energy cogeneration system for 24 hours on the next day, and the time scale of the day-ahead scheduling plan can be 1 hour.

[0132] The regional integrated energy system of the embodiment of the present application uses renewable energy to generate electricity through the renewable energy power generation system 121, which can increase the proportion of green electricity. The energy storage battery 131 and the hydrogen energy storage system can be used for off-peak energy storage. The hydrogen refueling terminal 146 in the hydrogen energy storage system can be used to refuel hydrogen for example for hydrogen fuel vehicles. The hydrogen energy storage system can be preheated and recycled through the electric boiler 151, which can improve the utilization rate of thermal energy. On this basis, the control system optimizes and solves the operating mathematical model of the multi-energy cogeneration system based on the objective function and constraints to obtain a scheduling scheme for the multi-energy cogeneration system. Based on the scheduling scheme, the operating status of the energy storage battery 131, alkaline electrolyzer 142, proton exchange membrane fuel cell 147 and electric boiler 151 of the multi-energy cogeneration system is scheduled and controlled, which can meet the power supply demand of the power load 161 and the heating demand of the thermal load 162, and can achieve the goal of minimizing the operating cost of the multi-energy cogeneration system, which can significantly reduce the system operating cost and achieve economical and stable operation of the system.

[0133] In some embodiments, the operating mathematical model of the multi-energy cogeneration system includes an operating mathematical model of an alkaline electrolyzer, an operating mathematical model of a proton exchange membrane fuel cell (PEMFC), an operating mathematical model of a hydrogen compressor, an operating mathematical model of a hydrogen storage tank, an operating mathematical model of an electric boiler, and an operating mathematical model of an energy storage battery.

[0134] Cap 1.1, the operating mathematical model of the alkaline electrolyzer may include a volt-ampere characteristic model, a hydrogen production characteristic model, and a waste heat recovery characteristic model of the alkaline electrolyzer. The volt-ampere characteristic model of the alkaline electrolyzer is used to characterize the volt-ampere characteristics of the alkaline electrolyzer. The volt-ampere characteristic model of the alkaline electrolyzer can be expressed by the following formulas (1) to (4).

[0135]

[0136]

[0137]

[0138]

[0139] Among them, U ael is the voltage of the alkaline electrolyzer; is the reversible overvoltage corrected by temperature and pressure; is the ohmic overvoltage; is the activation overvoltage; T is the number of electrolytic cells in series in a bipolar alkaline electrolytic cell; ael is the working temperature of the alkaline electrolytic cell; R is the standard gas constant; F is the Faraday constant; P is the working pressure of the alkaline electrolytic cell; is the water vapor partial pressure; is the activity of water; r1 and r2 are the ohmic overvoltage coefficients; J ael is the working current density; s1, s2, s3, t1, t2, t3 are the activation overvoltage coefficients.

[0140] The hydrogen production characteristic model of the alkaline electrolyzer can be expressed by the following formula (5) and formula (6).

[0141]

[0142]

[0143] in, is the hydrogen production rate of the alkaline electrolyzer, in Nm 3 / h; η F is the Faraday efficiency; I ael is the working current of the alkaline electrolytic cell; a1, a2, a3, a4, and a5 are the Faraday efficiency coefficients.

[0144] The waste heat recovery characteristic model of the alkaline electrolytic cell can be expressed by the following formula (7) and formula (8).

[0145]

[0146]

[0147] Among them, Q ael is the heat generation power of the alkaline electrolytic cell; U tn is the thermoneutral voltage; A is the active area of ​​the electrode; is the waste heat recovery power of the alkaline electrolyzer; R th is the thermal resistance of the electrolytic cell to the surrounding environment; t am is the ambient temperature; η rec is the waste heat recovery efficiency.

[0148] Cap 1.2: The mathematical model for the operation of the proton exchange membrane fuel cell (PEMFC) may include a volt-ampere characteristic model, a power generation model, an auxiliary power consumption model, and a waste heat recovery characteristic model. The volt-ampere characteristic model of the PEMFC can be expressed by the following equations (9) to (13).

[0149]

[0150]

[0151]

[0152]

[0153]

[0154] Among them, U fc is the voltage of PEMFC; is the open circuit voltage of PEMFC; is the electrode activation overvoltage of PEMFC; is the ohmic overvoltage of PEMFC; is the concentration overvoltage of PEMFC; is the number of PEMFC monomers in series; T fc is the operating temperature of PEMFC; T0 is the reference temperature under standard conditions; is the hydrogen partial pressure; is the partial pressure of oxygen; I fc is the operating current of PEMFC; i fc is the current density of PEMFC, unit is A / cm2; ASR is the area specific resistance of PEMFC; f1, f2, f3, f4 are the activation overvoltage coefficients of PEMFC; m and n are the concentration overvoltage coefficients of PEMFC.

[0155] The power generation model of PEMFC can be expressed by the following formulas (14) and (15).

[0156]

[0157] P fc =U fc I fc (15)

[0158] in, is the hydrogen consumption rate of PEMFC, unit is L / min; The stoichiometric ratio of hydrogen supplied to PEMFC; P fc is the output electrical power of PEMFC.

[0159] The auxiliary power consumption model of PEMFC can be expressed by the following formula (16).

[0160]

[0161] in, is the auxiliary power consumption of PEMFC; k0, k1, k2, k3, k4, k5 are fitting coefficients.

[0162] The waste heat recovery characteristic model of PEMFC can be expressed by the following formula (17).

[0163]

[0164]

[0165] Among them, Q fc is the heat generation power of PEMFC; is the enthalpy of hydrogen entering PEMFC; is the enthalpy of the air entering the PEMFC; is the enthalpy of hydrogen discharged from PEMFC; is the enthalpy of the exhaust air from PEMFC; is the enthalpy of water discharged from the anode; is the enthalpy of water discharged from the cathode; Q heat Thermal power consumed for heating the cathode and anode; Qdi s is the heat power dissipated to the surrounding environment; is the waste heat recovery power of PEMFC; η rec is the waste heat recovery efficiency.

[0166] Cap1.3, the operating mathematical model of the hydrogen compressor can be expressed by the following formula (19).

[0167]

[0168] Among them, P comp is the power consumption of the hydrogen compressor; η comp is the efficiency of the hydrogen compressor; ε is the adiabatic index; N gas is the gas flow rate of the hydrogen compressor; T in is the gas temperature entering the hydrogen compressor; P out is the exhaust pressure of the hydrogen compressor; P in is the suction pressure of the hydrogen compressor.

[0169] Cap1.4, the operating mathematical model of the hydrogen storage tank can be expressed by the following formula (20) and formula (21).

[0170]

[0171]

[0172] Where SOH is the ratio of the actual working pressure of the hydrogen storage tank to the rated working pressure; k is the time series number; P tank is the actual working pressure of the hydrogen storage tank; P ntank is the rated working pressure of the hydrogen storage tank; T tank is the operating temperature of the hydrogen storage tank; T s is the sampling time step; z is the compressibility factor of hydrogen; is the gas rate entering the hydrogen storage tank; is the gas velocity discharged from the hydrogen storage tank; V tankis the volume of the hydrogen storage tank.

[0173] Cap1.5, the operation mathematical model of the energy storage battery can be expressed by the following formula (22).

[0174]

[0175] Among them, SOC is the state of charge value of the energy storage battery; The charging power of the energy storage battery; is the discharge power of the energy storage battery; Q bat is the capacity of the energy storage battery; η bc is the charging efficiency of the energy storage battery; η bd is the discharge efficiency of the energy storage battery.

[0176] Cap1.6, the operation mathematical model of the electric boiler can be expressed by the following formula (23).

[0177] Q boiler =η boiler P boiler (twenty three)

[0178] Among them, Q boiler is the heating power of the electric boiler; P boiler is the electric power consumed by the electric boiler; η boiler The efficiency of the electric boiler.

[0179] It should be noted that the above-mentioned operation mathematical model of the multi-energy supply system is only exemplary. Different methods can be used to construct the operation mathematical model of the multi-energy supply system in specific implementation, and the operation mathematical models of the multi-energy supply system constructed by different methods may be different.

[0180] In some embodiments, the operating cost minC of the multi-energy cogeneration system includes the power transaction cost C between the regional electric power grid and the city power grid. grid 、The use cost of hydrogen energy storage system C HESS 、The cost of using energy storage batteries C BESS , power adjustment penalty C of alkaline electrolyzer ael_onoff , Power adjustment penalty C of proton exchange membrane fuel cell fc_onoff On this basis, the objective function can be expressed by the following formula (24).

[0181]

[0182] Among them, minC represents the goal of minimizing the operating cost of the regional integrated energy system; C grid represents the electricity transaction cost between regional electric power and the city power grid; C HESSRepresents the use cost of the hydrogen energy storage system, which is used to describe the life decline of the hydrogen energy storage system; C BESS Represents the cost of using the energy storage battery, which is used to describe the life decline of the energy storage battery; C ael_onoff represents the power adjustment penalty of the alkaline electrolyzer; C fc_onoff represents the power adjustment penalty of the proton exchange membrane fuel cell; C ael_onoff and C fc_onoff They are used to quantify the performance degradation costs caused by the start-up and shutdown processes of alkaline electrolyzers and PEMFCs, respectively; X is the decision variable; α and β are weight coefficients.

[0183] The objective function shown in formula (24) is used to optimize and solve the operation mathematical model of the multi-energy cogeneration system. This can take into account the life degradation of the hydrogen energy storage system and the energy storage battery, as well as the performance degradation cost caused by the start-up and shutdown processes of the alkaline electrolyzer and PEMFC. It can avoid frequent start-up and shutdown of the alkaline electrolyzer and PEMFC, and can accurately control the multi-energy cogeneration system to minimize the operating costs.

[0184] It should be noted that the above objective function is only exemplary. In actual application, as long as the objective function can describe the goal of minimizing the operating cost of the multi-energy supply system to a certain extent, it should not be understood as being limited to the use of the above objective function.

[0185] In some embodiments, the constraints include at least one of hydrogen storage tank constraints, alkaline electrolyzer constraints, proton exchange membrane fuel cell constraints, hydrogen compressor constraints, energy storage battery constraints, electric boiler constraints, regional power grid constraints, energy balance constraints, and scheduling continuity constraints.

[0186] Cap2.1, the constraints of the hydrogen storage tank can be expressed by the following formula (25).

[0187] SOH min ≤SOH t ≤SOH max (25)

[0188] Among them, SOH t SOH is the ratio of the actual working pressure of the hydrogen storage tank at time t to the rated working pressure; max Indicates the maximum SOH ratio of the hydrogen storage tank; SOH min Represents the minimum SOH ratio of the hydrogen storage tank.

[0189] Cap2.2, the constraints of the alkaline electrolytic cell can be expressed by the following formulas (26) to (30).

[0190]

[0191]

[0192]

[0193]

[0194]

[0195] in, and are the minimum allowable operating power and the maximum allowable operating power of the alkaline electrolyzer respectively; is the operating power of the alkaline electrolyzer at time t; is the thermal standby power of the alkaline electrolyzer at time t; is the thermal rated standby power of the alkaline electrolyzer; It is the operating status flag of the alkaline electrolytic cell at time t; is the operating status flag of PEMFC at time t; Represents the operating status flag of the hydrogen refueling terminal at time t; is the discharge status flag of the energy storage battery at time t; and The value of is 0 or 1, 1 represents the working state, and 0 represents the standby state.

[0196] Cap2.3, the constraints of the PEMFC can be expressed by the following formulas (31) to (34).

[0197]

[0198]

[0199]

[0200]

[0201] in, is the net output power of PEMFC at time t; and are the minimum allowable operating power and maximum allowable operating power of PEMFC respectively; is the operating status flag of PEMFC at time t; Represents the operating status flag of the hydrogen refueling terminal at time t; The power sales status flag of the regional power grid at time t; is the charging status flag of the energy storage battery at time t; The value of is 0 or 1, 1 represents the working state, and 0 represents the standby state.

[0202] Cap2.4, the constraints of the hydrogen compressor can be expressed by the following formula (35).

[0203]

[0204] in, is the power consumption of the hydrogen compressor at time t; It is the maximum allowable operating power of the hydrogen compressor.

[0205] Cap2.5, the constraints of the energy storage battery can be expressed by the following formulas (36) to (40).

[0206]

[0207]

[0208]

[0209]

[0210]

[0211] in, and are the charging power and discharging power of the energy storage battery at time t respectively; and are the maximum charging power and maximum discharging power of the energy storage battery respectively; The charging status flag of the energy storage battery at time t; The discharge status flag of the energy storage battery at time t; The power sales status flag of the regional power grid at time t; and The value of SOC is 0 or 1, 1 represents the working state, and 0 represents the standby state; t SOC is the state of charge of the energy storage battery at time t; min and SOC max They are the minimum and maximum allowable state of charge values ​​of the energy storage battery respectively.

[0212] Cap2.6, the constraints of the electric boiler can be expressed by the following formula (41).

[0213]

[0214] in, is the operating power of the electric boiler at time t; The maximum allowable operating power of the electric boiler.

[0215] Cap2.7, the constraints of the regional power grid can be expressed by the following formulas (42) to (44).

[0216]

[0217]

[0218]

[0219] in, and are the power purchased and sold by the regional power grid to the utility grid at time t; It is the power purchasing status flag of the regional power grid at time t; The power sales status flag of the regional power grid at time t; is the maximum allowable interaction power between the regional power grid and the utility grid.

[0220] Cap 2.8, the energy balance constraint condition includes at least one of an electric energy balance constraint condition, a thermal energy balance constraint condition, and a hydrogen energy balance constraint condition. The electric energy balance constraint condition can be expressed by the following formula (45).

[0221]

[0222] in, is the power generation of the renewable energy power generation system at time t; is the discharge power of the energy storage battery at time t; is the power purchased by the regional power grid from the utility grid at time t; is the net output power of PEMFC at time t; and are the charging power of the energy storage battery at time t respectively; is the operating power of the alkaline electrolyzer at time t; is the operating power of the electric boiler at time t; is the power load at time t; is the power consumption of the hydrogen compressor at time t; is the power sold by the regional power grid to the utility grid at time t; is the thermal standby power of the alkaline electrolyzer at time t.

[0223] The thermal energy balance constraint can be expressed by the following formula (46).

[0224]

[0225] in, is the waste heat recovery power of PEMFC at time t; is the waste heat recovery power of the alkaline electrolytic cell at time t, is the heating power of the electric boiler at time t; is the thermal load at time t;

[0226] The hydrogen energy balance constraint can be expressed by the following formula (47).

[0227]

[0228] in, is the change in the hydrogen storage tank's reserves per unit time; is the amount of hydrogen produced per unit time by the alkaline electrolyzer; is the hydrogen consumption per unit time of PEMFC; is the amount of hydrogen added per unit time at the hydrogenation terminal; γ is the loss percentage in the hydrogen purification link.

[0229] Cap2.9, the scheduling continuity constraint can be expressed by the following formula (48) and formula (49).

[0230] SOC0=SOC 24 (48)

[0231] SOH0=SOH 24 (49)

[0232] Among them, SOC0 is the state of charge value of the energy storage battery at the initial time of scheduling; SOC 24 is the state of charge value of the energy storage battery at the end of scheduling; SOH0 is the SOH value of the hydrogen storage tank at the initial time of scheduling; SOH 24 is the SOH value of the hydrogen storage tank at the end of scheduling; SOH is the ratio of the actual working pressure of the hydrogen storage tank to the rated working pressure.

[0233] The above embodiments are merely exemplary embodiments of the present application and are not intended to limit the scope of the present application. The scope of protection of the present application is defined by the claims. Those skilled in the art may make various modifications or equivalent substitutions to the present application within the essence and scope of protection of the present application, and such modifications or equivalent substitutions shall also be deemed to fall within the scope of protection of the present application.

Claims

1. A regional integrated energy system, characterized in that: Including multi-energy supply system and control system; The multi-energy cogeneration system includes a regional power grid, a renewable energy power generation system, an energy storage battery, a hydrogen energy storage system and an electric boiler; the regional power grid is connected to the mains power grid, the renewable energy power generation system, the energy storage battery and the power load respectively; The hydrogen energy storage system includes an alkaline electrolyzer, a buffer tank, a hydrogen compressor, a hydrogen storage tank, and a proton exchange membrane fuel cell connected in sequence through a hydrogen pipeline, and a hydrogenation terminal connected to the hydrogen storage tank; the alkaline electrolyzer and the proton exchange membrane fuel cell are respectively connected to the regional power grid; The electric boiler is connected to the regional power grid, the alkaline electrolyzer, the proton exchange membrane fuel cell and the thermal load respectively. The electric boiler can recover waste heat from the alkaline electrolyzer and the proton exchange membrane fuel cell, and use the recovered heat energy and / or electrical energy to heat the thermal load; The control system is configured as follows: Determining an objective function for describing the objective of minimizing the operating cost of the multi-energy cogeneration system, constraints for constraining the operating state of the multi-energy cogeneration system, and an operating mathematical model of the multi-energy cogeneration system for characterizing the coupling characteristics of the electric energy, hydrogen energy, and thermal energy of the multi-energy cogeneration system; Based on the objective function and the constraints, an operating mathematical model of the multi-energy cogeneration system is optimized and solved to obtain a scheduling plan for the multi-energy cogeneration system; wherein the scheduling plan includes at least the charging power and discharging power of the energy storage battery, the operating power of the alkaline electrolyzer, the net output power of the proton exchange membrane fuel cell, and the operating power of the electric boiler; Based on the scheduling scheme, the operating status of the energy storage battery, alkaline electrolyzer, proton exchange membrane fuel cell and electric boiler in the multi-energy cogeneration system is scheduled and controlled to supply power to the electrical load and heat to the thermal load while meeting the goal of minimizing the operating cost of the multi-energy cogeneration system.

2. The regional integrated energy system according to claim 1, characterized in that: The operation mathematical model of the multi-energy cogeneration system includes the operation mathematical model of the alkaline electrolyzer, the operation mathematical model of the proton exchange membrane fuel cell, the operation mathematical model of the hydrogen compressor, the operation mathematical model of the hydrogen storage tank, the operation mathematical model of the electric boiler and the operation mathematical model of the energy storage battery.

3. The regional integrated energy system according to claim 2, characterized in that: The operation mathematical model of the alkaline electrolyzer includes: Among them, U ael is the voltage of the alkaline electrolyzer; is the reversible overvoltage corrected by temperature and pressure; is the ohmic overvoltage; is the activation overvoltage; T is the number of electrolytic cells in series in a bipolar alkaline electrolytic cell; ael is the working temperature of the alkaline electrolytic cell; R is the standard gas constant; F is the Faraday constant; P is the working pressure of the alkaline electrolytic cell; is the water vapor partial pressure; is the activity of water; r1 and r2 are the ohmic overvoltage coefficients; J ael is the working current density; s1, s2, s3, t1, t2, t3 are the activation overvoltage coefficients; in, is the hydrogen production rate of the alkaline electrolyzer, in Nm 3 / h; η F is the Faraday efficiency; I ael is the working current of the alkaline electrolytic cell; a1, a2, a3, a4, and a5 are the Faraday efficiency coefficients; Among them, Q ael is the heat generation power of the alkaline electrolytic cell; U tn is the thermoneutral voltage; A is the active area of ​​the electrode; is the waste heat recovery power of the alkaline electrolyzer; R th is the thermal resistance of the electrolytic cell to the surrounding environment; t am is the ambient temperature; η rec is the waste heat recovery efficiency.

4. The regional integrated energy system according to claim 3, characterized in that: The operation mathematical model of the proton exchange membrane fuel cell includes: Among them, U fc is the voltage of the proton exchange membrane fuel cell; is the open circuit voltage of the proton exchange membrane fuel cell; The electrode activation overvoltage of the proton exchange membrane fuel cell; is the ohmic overvoltage of the proton exchange membrane fuel cell; is the concentration overvoltage of the proton exchange membrane fuel cell; is the number of monomers in series in the proton exchange membrane fuel cell; T fc is the operating temperature of the proton exchange membrane fuel cell; T0 is the reference temperature under standard conditions; is the hydrogen partial pressure; is the oxygen partial pressure; I fc is the operating current of the proton exchange membrane fuel cell; i fc is the current density of the proton exchange membrane fuel cell, in amperes per square centimeter; ASR is the area specific resistance of the proton exchange membrane fuel cell; f1, f2, f3, and f4 are the activation overvoltage coefficients of the proton exchange membrane fuel cell; m and n are the concentration overvoltage coefficients of the proton exchange membrane fuel cell; P fc =U fc T fc in, is the hydrogen consumption rate of the proton exchange membrane fuel cell, in L / min; The stoichiometric ratio of hydrogen supplied to the proton exchange membrane fuel cell; P fc is the output electrical power of the proton exchange membrane fuel cell; in, is the auxiliary power consumption of the proton exchange membrane fuel cell; k0, k1, k2, k3, k4, k5 are fitting coefficients; Among them, Q fc is the heat generation power of the proton exchange membrane fuel cell; is the enthalpy of hydrogen entering the proton exchange membrane fuel cell; is the enthalpy of the air entering the proton exchange membrane fuel cell; is the enthalpy of hydrogen discharged from the mass exchange membrane fuel cell; The enthalpy of exhaust air for proton exchange membrane fuel cells; is the enthalpy of water discharged from the anode; is the enthalpy of water discharged from the cathode; Q heat Thermal power consumed for heating the cathode and anode; Q dis is the heat power dissipated to the surrounding environment; is the waste heat recovery power of the proton exchange membrane fuel cell; η rec is the waste heat recovery efficiency.

5. The regional integrated energy system according to claim 4, characterized in that: The operation mathematical model of the hydrogen compressor includes: Among them, P comp is the power consumption of the hydrogen compressor; η comp is the efficiency of the hydrogen compressor; ε is the adiabatic index; N gas is the gas flow rate of the hydrogen compressor; T in is the gas temperature entering the hydrogen compressor; P out is the exhaust pressure of the hydrogen compressor; P in is the suction pressure of the hydrogen compressor.

6. The regional integrated energy system according to claim 5, characterized in that: The operation mathematical model of the hydrogen storage tank includes: Where SOH is the ratio of the actual working pressure of the hydrogen storage tank to the rated working pressure; k is the time series number; P tank is the actual working pressure of the hydrogen storage tank; P ntank is the rated working pressure of the hydrogen storage tank; T tank is the operating temperature of the hydrogen storage tank; T s is the sampling time step; z is the compressibility factor of hydrogen; is the gas rate entering the hydrogen storage tank; is the gas velocity discharged from the hydrogen storage tank; V tank is the volume of the hydrogen storage tank.

7. The regional integrated energy system according to claim 6, characterized in that: The operation mathematical model of the energy storage battery includes: Among them, SOC is the state of charge value of the energy storage battery; The charging power of the energy storage battery; is the discharge power of the energy storage battery; Q bat is the capacity of the energy storage battery; η bc is the charging efficiency of the energy storage battery; η bd is the discharge efficiency of the energy storage battery.

8. The regional integrated energy system according to claim 7, characterized in that: The operation mathematical model of the electric boiler includes: Q boiler =η boiler P boiler Among them, Q boiler is the heating power of the electric boiler; P boiler is the electric power consumed by the electric boiler; η boiler The efficiency of the electric boiler.

9. The regional integrated energy system according to claim 8, characterized in that: The objective function is expressed as: Where minC represents the operating cost minimization objective of the multi-energy cogeneration system; C grid represents the electricity transaction cost between regional electric power and the city power grid; C HESS represents the use cost of the hydrogen energy storage system; C BEss Represents the cost of using energy storage batteries; C ael_onoff represents the power adjustment penalty of the alkaline electrolyzer; C fc_onoff represents the power adjustment penalty of the proton exchange membrane fuel cell; X is the decision variable; α and β are weight coefficients.

10. The regional integrated energy system according to any one of claims 1 to 9, characterized in that: The constraints include at least one of the constraints of the hydrogen storage tank, the constraints of the alkaline electrolyzer, the constraints of the proton exchange membrane fuel cell, the constraints of the hydrogen compressor, the constraints of the energy storage battery, the constraints of the electric boiler, the constraints of the regional power grid, the energy balance constraints and the scheduling continuity constraints.

11. The regional integrated energy system according to claim 10, characterized in that: The constraints of the hydrogen storage tank include: SOH min ≤SOH t ≤SOH max Among them, SOH t SOH is the ratio of the actual working pressure of the hydrogen storage tank at time t to the rated working pressure; max Indicates the maximum SOH ratio of the hydrogen storage tank; SOH min Represents the minimum SOH ratio of the hydrogen storage tank.

12. The regional integrated energy system according to claim 10, characterized in that: The constraints of the alkaline electrolytic cell include: in, and are the minimum allowable operating power and the maximum allowable operating power of the alkaline electrolyzer respectively; is the operating power of the alkaline electrolyzer at time t; is the thermal standby power of the alkaline electrolyzer at time t; is the thermal rated standby power of the alkaline electrolyzer; It is the operating status flag of the alkaline electrolytic cell at time t; is the operating status flag of the proton exchange membrane fuel cell at time t; Represents the operating status flag of the hydrogen refueling terminal at time t; is the discharge status flag of the energy storage battery at time t; and The value of is 0 or 1, 1 represents the working state, and 0 represents the standby state.

13. The regional integrated energy system according to claim 10, characterized in that: The constraints of the proton exchange membrane fuel cell include: in, is the net output power of the proton exchange membrane fuel cell at time t; and are the minimum allowable operating power and maximum allowable operating power of the proton exchange membrane fuel cell respectively; is the operating status flag of the proton exchange membrane fuel cell at time t; Represents the operating status flag of the hydrogen refueling terminal at time t; The power sales status flag of the regional power grid at time t; is the charging status flag of the energy storage battery at time t; The value of is 0 or 1, 1 represents the working state, and 0 represents the standby state.

14. The regional integrated energy system according to claim 10, characterized in that: The constraints of the hydrogen compressor include: in, is the power consumption of the hydrogen compressor at time t; It is the maximum allowable operating power of the hydrogen compressor.

15. The regional integrated energy system according to claim 10, characterized in that: The constraints of the energy storage battery include: in, and are the charging power and discharging power of the energy storage battery at time t respectively; and are the maximum charging power and maximum discharging power of the energy storage battery respectively; The charging status flag of the energy storage battery at time t; The discharge status flag of the energy storage battery at time t; The power sales status flag of the regional power grid at time t; and The value of SOC is 0 or 1, 1 represents the working state, and 0 represents the standby state; t SOC is the state of charge of the energy storage battery at time t; min and SOC max They are the minimum and maximum allowable state of charge values ​​of the energy storage battery respectively.

16. The regional integrated energy system according to claim 10, characterized in that: The constraints of the electric boiler include: in, is the operating power of the electric boiler at time t; It is the maximum allowable operating power of the electric boiler.

17. The regional integrated energy system according to claim 10, characterized in that: The constraints of the regional power grid include: in, and are the power purchased and sold by the regional power grid to the utility grid at time t; It is the power purchasing status flag of the regional power grid at time t; The power sales status flag of the regional power grid at time t; is the maximum allowable interaction power between the regional power grid and the utility grid.

18. The regional integrated energy system according to claim 10, characterized in that: The energy balance constraint condition includes at least one of an electric energy balance constraint condition, a thermal energy balance constraint condition, and a hydrogen energy balance constraint condition; The power balance constraints include: in, is the power generation of the renewable energy power generation system at time t; is the discharge power of the energy storage battery at time t; is the power purchased by the regional power grid from the utility grid at time t; is the net output power of the proton exchange membrane fuel cell at time t; and are the charging power of the energy storage battery at time t respectively; is the operating power of the alkaline electrolyzer at time t; is the operating power of the electric boiler at time t; is the power load at time t; is the power consumption of the hydrogen compressor at time t; is the power sold by the regional power grid to the utility grid at time t; is the thermal standby power of the alkaline electrolyzer at time t; The thermal energy balance constraints include: in, is the waste heat recovery power of the proton exchange membrane fuel cell at time t; is the waste heat recovery power of the alkaline electrolytic cell at time t, is the heating power of the electric boiler at time t; is the thermal load at time t; The hydrogen energy balance constraints include: in, is the change in the hydrogen storage tank's reserves per unit time; is the amount of hydrogen produced per unit time by the alkaline electrolyzer; is the hydrogen consumption per unit time of the proton exchange membrane fuel cell; is the amount of hydrogen added per unit time at the hydrogenation terminal; γ is the loss percentage in the hydrogen purification link.

19. The regional integrated energy system according to claim 10, characterized in that: The scheduling continuity constraint conditions include: SOC0=SOC 24 SOH0=SOH 24 Among them, SOC0 is the state of charge value of the energy storage battery at the initial time of scheduling; SOC 24 is the state of charge value of the energy storage battery at the end of scheduling; SOH0 is the SOH value of the hydrogen storage tank at the initial time of scheduling; SOH 24 is the SOH value of the hydrogen storage tank at the end of scheduling; SOH is the ratio of the actual working pressure of the hydrogen storage tank to the rated working pressure.

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