Integrated energy system operation optimization model

Abstract

The present invention discloses an integrated energy system operation optimization model, including a regional energy system control center and various production equipment, conversion equipment and storage equipment, the regional energy system control center is respectively connected to various production equipment, conversion equipment and storage equipment, the storage equipment is respectively connected to various production equipment and conversion equipment, and the regional energy system control center is respectively connected to energy consumption side modules and energy supply side modules. The present invention increases the coupling of the system, ensures the reliable operation of the integrated energy system, and improves the utilization efficiency of energy.

Description

Technical Field

[0001] The present invention relates to the technical field of energy management, and in particular to an integrated energy system operation optimization model. Background Art

[0002] In recent years, my country's energy consumption structure dominated by fossil energy has brought serious environmental and climate problems, and the pressure of energy conservation and emission reduction has also increased. Improving energy efficiency and an energy structure dominated by clean energy have become an inevitable trend for sustainable economic development. As a prerequisite for the construction of smart grids and energy Internet, integrated energy systems are booming, which can achieve complementary advantages of multiple energy sources and improve energy efficiency, becoming a specific way to solve energy problems. However, the coupling between various systems such as power systems, thermal systems, and natural gas systems is not strong at present. It is urgent to increase coupling between multiple systems, improve the system's risk resistance, and ensure the safe and reliable operation of integrated energy systems.

[0003] At present, the research on the operation optimization of integrated energy systems is mostly focused on achieving low-carbon and economic goals in a specific scenario, taking the minimum cost of the integrated energy system as the optimization result, and taking the power constraints, output range constraints, energy storage capacity constraints and controllable unit ramp output of each system as constraints to construct an optimization model of the integrated energy system. Reference [1] considered the cost of wind abandonment, environmental pollution costs and the cost of electricity and thermal energy storage loss in constructing a regional integrated energy system dispatch cost model, thereby improving the problem of poor dispatch economy. Reference [2] compared the operation costs under four scenarios with power supply balance, heating (cooling) balance and micro gas turbine operation as constraints. Reference [3] proposed an optimized operation method of the integrated energy system based on alliance game under the condition of maximizing the utility of energy suppliers and users, and established a two-level optimization model of the integrated energy system considering the comprehensive demand response of new energy generators. Reference [4] considers the energy flow model and safety constraints of the power system and natural gas system containing power-to-gas conversion, converts carbon dioxide emissions into economic dimensions and the system's operating costs to form an objective function with the lowest comprehensive cost, thereby constructing an optimal operation model for the integrated energy system. Reference [5], in addition to considering the general constraints of the optimization of the operation of the integrated energy system, takes into account the market price of green certificates, green certificate quotas, electrical bus balance, hot water bus balance, and steam bus balance, and establishes an optimization model for the integrated energy system containing cross-chain transactions of green certificates; Reference [6] considers constraints such as power balance, power generation equipment output limit, energy storage device capacity, and energy storage device charging and discharging, and establishes an objective function that includes direct operating costs and comprehensive carbon costs for the construction of the community-level integrated energy system optimization model.

[0004] This paper aims at the operation optimization problem of the integrated energy system. It considers the independent operation and coupled transformation of the three parts of the system: the power system, the natural gas system, and the thermal system. It takes the minimization of the total cost of the integrated energy system as the objective function and the output of each equipment and power balance as constraints to construct a system planning model that meets the three types of loads in the system: electric load, thermal load, and gas load. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide an integrated energy system operation optimization model in view of the above-mentioned defects in the prior art, increase the coupling of each system, ensure the reliable operation of the integrated energy system, and improve the energy utilization efficiency.

[0006] The technical solution adopted by the present invention to solve the above technical problems is:

[0007] A comprehensive energy system operation optimization model includes a regional energy system control center and various production equipment, conversion equipment and storage equipment. The regional energy system control center is connected to the various production equipment, conversion equipment and storage equipment respectively, and the storage equipment is connected to the various production equipment and conversion equipment respectively. The regional energy system control center is connected to energy consumption side modules and energy supply side modules respectively.

[0008] According to the above technical solution, the production equipment includes renewable power generation system, photovoltaic power generation system, cogeneration unit and combined cooling, heating and power system;

[0009] Conversion equipment includes gas turbines, gas boilers, and hydrogen fuel cells;

[0010] Storage equipment includes energy storage batteries, heat storage tanks and gas storage tanks.

[0011] According to the above technical solution, the integrated energy system operation optimization model is constructed with the minimum optimized operation cost of the integrated energy system as the objective function:

[0012] min Q=k wt P wt +k pv P pv +k DG P DG +k P2G P P2G +k EB P EB +k GB P GB +k ES P ES +k HS P HS +k GS P GS +C ele +C gas+C he

[0013] Among them, P wt is the maximum power output of the wind power generation system in 24 hours, P pv is the maximum output power of the photovoltaic power generation system in 24 hours, P DG is the maximum output power of the gas generator set in 24 hours, P P2G is the maximum output power of P2G in 24 hours, P EB is the maximum output power of the CLP boiler at 24 hours, P GB is the maximum output power of the gas boiler in 24 hours, P ES is the maximum storage power in 24 hours, P HS is the maximum hydrogen storage power in 24 hours, P GS It is the maximum gas storage power in 24 hours;

[0014] k wt is the unit cost of wind turbine generator set, k pv is the unit cost of the photovoltaic unit, k DG is the unit cost of the gas unit, k P2G is the unit cost of P2G equipment, k EB is the unit cost of electric boiler, k GB is the unit cost of gas boiler, k HS is the unit cost of the heat storage tank, k ES is the unit cost of energy storage battery, k GS is the unit cost of the gas tank, C ele is the electricity purchase cost, C gas is the gas purchase cost, C he The cost of purchasing heat.

[0015] According to the above technical scheme, the production equipment and conversion equipment of the integrated energy system are classified into electric power systems, natural gas systems and heating and cooling systems. The electric power in the entire area of ​​the integrated energy system operation optimization model needs to maintain a balanced state, including electric power balance, thermal power balance and gas power balance.

[0016] According to the above technical solution, the electric power balance is:

[0017] P pv,t +P w,t +P DG,t =P P2G,t +P ES,t +P aE,t

[0018] Where P aE,t is the user's electricity load, P pv,t is the power generation of the photovoltaic power generation system at time t, P w,tis the wind power output power of the wind power generation system at time t, P DG,t is the power of the gas unit, P P2G,t is the power of gas generated by P2G power-to-gas conversion, P ES The gas reserve power of the battery at time t.

[0019] P pv,t =AIη pv

[0020] Where A is the photovoltaic installation capacity; I is the sunshine intensity; η pv is the photoelectric conversion efficiency;

[0021] Wind power generation system

[0022] In the formula, represents the rated power of wind power output at time t; For wind turbines;

[0023]

[0024]

[0025] Where P DG,t is the power of the gas unit, is the upper limit of gas unit power, is the lower limit of gas unit power, is the lower limit of the gas unit climbing power, It is the upper limit of the ramp power of the gas generator set;

[0026]

[0027] Where P P2G,t The power of gas generated by P2G power conversion, is the electric power input to P2G, η P2G For P2G equipment efficiency;

[0028]

[0029] P ES,t is the gas storage power of the battery at time t, is the heat storage power of the heat storage tank, η est Heat retention efficiency, is the power released by the gas tank, η erl is the gas release efficiency.

[0030] According to the above technical solution, thermal power balance:

[0031] P EB,t +P GB,t =P aH,t+P HS,t

[0032] Where P aH,t The heat load of the user, P EB,t is the thermal output power of the electric boiler at time t, P GB,t is the thermal output power of the gas boiler at time t, P HS,t is the gas retention power in the heat storage tank at time t.

[0033]

[0034] Where P EB,t is the thermal output power of the electric boiler, is the electric power of the electric boiler, η eg is the electricity-to-heat efficiency of the electric boiler;

[0035]

[0036] Where P GB,t is the thermal output power of the gas boiler, Gas-to-heat efficiency of gas boiler, η gg The gas power of the gas boiler;

[0037]

[0038] P HS,t is the gas retention power of the heat storage tank at time t, is the heat storage power of the heat storage tank, η hst Heat retention efficiency, is the power released by the gas tank, η hrl is the gas release efficiency.

[0039] According to the above technical solution, the gas power balance is:

[0040] P P2G,t =P aG,t +P GS,t

[0041] Where P aG,t is the gas load of the user, P P2G,t is the power of gas generated by P2G at time t, P GS,t It is the gas retention power in the gas tank at time t.

[0042]

[0043] Where P P2G,t is the power of gas generated by P2G at time t, is the electric power input to P2G, η P2G For P2G equipment efficiency;

[0044]

[0045] P GS,t is the gas retention power of the gas tank at time t, is the storage power of the gas tank, η gst is the gas retention efficiency, is the power released by the gas tank, η grl is the gas release efficiency.

[0046] The present invention has the following beneficial effects:

[0047] The present invention increases the coupling of various systems, ensures the reliable operation of the comprehensive energy system, and improves the utilization efficiency of energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 It is a framework diagram of the integrated energy system operation optimization model in an embodiment of the present invention;

[0049] Figure 2 is a load curve diagram of electricity, heat and gas consumption of users in an embodiment of the present invention;

[0050] Figure 3 It is an output curve diagram of each device in the time period of the comprehensive energy system operation optimization model in the embodiment of the present invention;

[0051] Figure 4 It is a column chart of the investment cost of each device in the comprehensive energy system operation optimization model in the embodiment of the present invention. DETAILED DESCRIPTION

[0052] The present invention is described in detail below with reference to the accompanying drawings and embodiments.

[0053] Reference Figure 1 to Figure 4 As shown, an integrated energy system operation optimization model in an embodiment provided by the present invention includes a regional energy system control center and various production equipment, conversion equipment and storage equipment. The regional energy system control center is respectively connected to the various production equipment, conversion equipment and storage equipment, and the storage equipment is respectively connected to the various production equipment and conversion equipment. The regional energy system control center is respectively connected to the energy consumption side module and the energy supply side module. The regional energy system control center obtains the electricity purchase cost, gas purchase cost and heat purchase cost and the corresponding demand through the energy consumption side module and the energy supply side module.

[0054] Further, the production equipment includes a renewable power generation system, a distributed photovoltaic power generation system, a cogeneration unit and a combined cooling, heating and power system; the renewable power generation system includes a wind power generation system;

[0055] Conversion equipment includes gas turbines, gas boilers, and hydrogen fuel cells; conversion equipment also includes electric boilers and P2G equipment;

[0056] Storage equipment includes energy storage batteries, heat storage tanks and gas storage tanks.

[0057] Furthermore, the integrated energy system operation optimization model is constructed with the lowest integrated energy system optimization operation cost as the objective function:

[0058] min Q=k wt P wt +k pv P pv +k DG P DG +k P2G P P2G +k EB P EB +k GB P GB +k ES P ES +k HS P HS +k GS P GS +C ele +C gas +C he

[0059] Among them, P wt is the maximum power output of the wind power generation system in 24 hours, P pv is the maximum output power of the photovoltaic power generation system in 24 hours, P DG is the maximum output power of the gas generator set in 24 hours, P P2G is the maximum output power of P2G in 24 hours, P EB is the maximum output power of the CLP boiler at 24 hours, P GB is the maximum output power of the gas boiler in 24 hours, P ES is the maximum storage power in 24 hours, P HS is the maximum hydrogen storage power in 24 hours, P GS It is the maximum gas storage power in 24 hours;

[0060] k wt is the unit cost of wind turbine generator set, k pv is the unit cost of the photovoltaic unit, k DG is the unit cost of the gas unit, k P2G is the unit cost of P2G equipment, k EB is the unit cost of electric boiler, k GB is the unit cost of gas boiler, k HS is the unit cost of the heat storage tank, k ESis the unit cost of energy storage battery, k GS is the unit cost of the gas tank, C ele is the electricity purchase cost, C gas is the gas purchase cost, C he The cost of purchasing heat; the production equipment and conversion equipment include wind turbines, photovoltaic units, gas units, P2G equipment, electric boilers and gas boilers; the storage equipment includes energy storage batteries, heat storage tanks and gas storage tanks.

[0061] Furthermore, P2G equipment refers to renewable energy power generation technology equipment that uses surplus electricity from wind power generation, solar power generation, etc. to electrolyze water to produce hydrogen, which is then provided to the existing gas pipeline network; or uses electricity, water and CO2 in the atmosphere to produce methane through a methanation reaction to provide gas.

[0062] Furthermore, the production equipment and conversion equipment of the integrated energy system are classified into electric power systems, natural gas systems and heating and cooling systems, and the electric power in the entire area needs to maintain a balanced state, including electric power balance, thermal power balance and gas power balance.

[0063] Furthermore, the electrical power balance:

[0064] P pv,t +P w,t +P DG,t =P P2G,t +P ES,t +P aE,t

[0065] Where P aE,t is the user's power load, P pv,t is the power generation of the photovoltaic power generation system at time t, P w,t is the wind power output power of the wind power generation system at time t, P DG,t is the power of the gas unit, P P2G,t is the power of gas generated by P2G power-to-gas conversion, P ES The gas reserve power of the battery at time t.

[0066] P pv,t =AIη pv

[0067] Where A is the photovoltaic installation capacity; I is the sunshine intensity; η pv is the photoelectric conversion efficiency;

[0068] Wind power generation system

[0069] In the formula, represents the rated power of wind power output at time t; For wind turbines;

[0070]

[0071]

[0072] Where P DG,t is the power of the gas unit, is the upper limit of gas unit power, is the lower limit of gas unit power, is the lower limit of the gas unit climbing power, It is the upper limit of the ramp power of the gas generator set;

[0073]

[0074] Where P P2G,t The power of gas generated by P2G power conversion, is the electric power input to P2G, η P2G For P2G equipment efficiency;

[0075]

[0076] P ES,t is the gas storage power of the battery at time t, is the heat storage power of the heat storage tank, η est Heat retention efficiency, is the power released by the gas tank, η erl is the gas release efficiency.

[0077] Further, thermal power balance:

[0078] P EB,t +P GB,t =P aH,t +P HS,t

[0079] Where P aH,t The heat load of the user, P EB,t is the thermal output power of the electric boiler at time t, P GB,t is the thermal output power of the gas boiler at time t, P HS,t is the gas retention power in the heat storage tank at time t.

[0080]

[0081] Where P EB,t is the thermal output power of the electric boiler, is the electric power of the electric boiler, η eg is the electricity-to-heat efficiency of the electric boiler;

[0082]

[0083] Where PGB,t is the thermal output power of the gas boiler, Gas-to-heat efficiency of gas boiler, η gg The gas power of the gas boiler;

[0084]

[0085] P HS,t is the gas retention power of the heat storage tank at time t, is the heat storage power of the heat storage tank, η hst Heat retention efficiency, is the power released by the gas tank, η hrl is the gas release efficiency.

[0086] Further, the gas power balance:

[0087] P P2G,t =P aG,t +P GS,t

[0088] Where P aG,t is the gas load of the user, P P2G,t is the power of gas generated by P2G at time t, P GS,t It is the gas retention power in the gas tank at time t.

[0089]

[0090] Where P P2G,t is the power of gas generated by P2G at time t, is the electric power input to P2G, η P2G For P2G equipment efficiency;

[0091]

[0092] P GS,t is the gas retention power of the gas tank at time t, is the storage power of the gas tank, η gst is the gas retention efficiency, is the power released by the gas tank, η grl is the gas release efficiency.

[0093] Working principle of the present invention: The integrated energy system is a complex coupling system composed of an electric power system, a natural gas system and a heat (cooling) system. In the process of energy construction and planning, energy is organically coordinated and planned through the production, supply, conversion, storage and consumption of various types of energy. Its basic architecture lies in the physical composition of the integrated energy system, that is, to ensure the basic operation of the integrated energy system. A scientific, comprehensive and accurate description of the basic architecture of the integrated energy system is the basis for multi-scale system modeling of the integrated energy system. This article describes the basic architecture of the integrated energy system from three parts: the energy supply side, the transmission and distribution side, and the consumption side.

[0094] The energy supply side is the upstream market. The upstream market is generally composed of the electricity market, the heat market and the natural gas market. The primary and secondary energy produced by it are delivered to the demand side for users on the one hand, and wholesaled to the integrated energy system operators on the other hand. Through various methods, the primary and secondary energy are efficiently and quickly converted into various energy forms to meet the energy needs of different users on the demand side.

[0095] The energy transmission and distribution side is the integrated energy system operator. The integrated energy system operator consists of a regional energy system control center and various production equipment, conversion equipment and storage equipment. On the one hand, the regional energy control center receives energy wholesale demand response information and energy trading demand response instructions from the upstream market and demand side, and on the other hand, it remotely measures production equipment, conversion equipment and storage equipment. The production equipment is a small-scale renewable power generation system, generally including distributed photovoltaic power generation, combined heat and power (CHP) units and combined cooling, heating and power (CCHP) systems. Conversion equipment includes gas turbines, gas boilers, hydrogen fuel cells and other equipment. Storage equipment is auxiliary equipment including energy storage batteries, heat storage tanks and gas storage tanks.

[0096] The energy consumption side is the demand side. The demand side is generally composed of typical industrial park users, typical public institution users, typical commercial users and typical residential users. The demand side obtains energy in two ways: one is to purchase it directly from the upstream market, and the other is to obtain energy supply services from the integrated energy system operator through the energy transmission network, including the power grid, heat network and cold network. In addition, the demand side provides transaction data for the regional energy control center to implement load monitoring.

[0097] Construction of mathematical model for optimal operation of integrated energy system

[0098] The model mainly considers gas turbines, energy storage and other equipment to meet the user's electricity, heat and gas load needs, takes the minimum operation cost as the objective function, and realizes the economic operation of the system. Specifically, the electricity load meets the user's electricity demand through wind power generation system, photovoltaic power generation system, and gas units, the heat load meets the user's heat demand through gas boilers, and the gas load meets the user's gas demand through P2G.

[0099] 3.1 System Constraints

[0100] In this paper, the integrated energy system relies on wind power generation system, photovoltaic power generation system,

[0101] (1) Wind power generation system

[0102]

[0103] In the formula, represents the rated power of wind power output at time t; For wind turbines.

[0104] (2) Photovoltaic power generation system

[0105] P pv,t =AIη pv

[0106] Where A is the photovoltaic installation capacity; I is the sunshine intensity; η pv is the photoelectric conversion efficiency.

[0107] (3) Gas Generator

[0108] The system's gas-fired unit is driven by a gas turbine that generates electricity through the compression of natural gas and the mixing and combustion of the gas with the fuel in the fuel chamber, thus achieving gas-to-electricity conversion.

[0109]

[0110]

[0111] Where P DG,t is the power of the gas unit, is the upper limit of gas unit power, is the lower limit of gas unit power, is the lower limit of the gas unit climbing power, It is the upper limit of the climbing power of the gas unit.

[0112] (4) P2G

[0113]

[0114] Where P P2G,t The power of gas generated by P2G power conversion, is the electric power input to P2G, η P2G For P2G equipment efficiency.

[0115] (5) Boiler

[0116] In this model, boilers are divided into electric boilers and gas boilers. Electric boilers realize the conversion of electricity to heat, and gas boilers realize the conversion of gas to heat by burning natural gas.

[0117] 1) Electric boiler

[0118]

[0119] Where P EB,t is the thermal output power of the electric boiler, is the electric power of the electric boiler, η eg It is the electricity-to-heat efficiency of electric boiler.

[0120] 2) Gas boiler

[0121]

[0122] P GB,t is the thermal output power of the gas boiler, Gas-to-heat efficiency of gas boiler, η gg Gas power for gas boiler.

[0123] (6) Energy storage system

[0124] 1) Gas storage device

[0125]

[0126] P GS,t is the gas retention power of the gas tank at time t, is the storage power of the gas tank, η gst Gas retention efficiency, is the power released by the gas tank, η grl is the gas release efficiency.

[0127] 2) Heat storage device

[0128]

[0129] P HS,t is the gas retention power of the heat storage tank at time t, is the heat storage power of the heat storage tank, η hst Heat retention efficiency, is the power released by the gas tank, η hrl is the gas release efficiency.

[0130] 3) Battery

[0131]

[0132] P ES,t is the gas storage power of the battery at time t, is the heat storage power of the heat storage tank, η est Heat retention efficiency, is the power released by the gas tank, η erl is the gas release efficiency.

[0133] 3.2 Power Balance Constraints

[0134] In addition to meeting the power constraints of each of the above systems, the power in the entire area needs to be balanced:

[0135] (1) Electric power balance

[0136] P pv,t +P w,t +P DG,t =P P2G,t +P ES,t +P aE,t

[0137] Where P aE,t The electricity load of the user.

[0138] (2) Thermal power balance

[0139] P EB,t +P GB,t =P aH,t +P HS,t

[0140] Where P aH,t The electricity load of the user.

[0141] (3) Gas power balance

[0142] P P2G,t =P aG,t +P GS,t

[0143] Where P aG,t The electricity load of the user.

[0144] 3.3 Objective Function

[0145] The model takes the lowest cost of optimizing the operation of the integrated energy system as its objective function:

[0146] min Q=k wt P wt +k pv P pv +k DG P DG +k P2G PP2G +k EB P EB +k GB P GB +k ES P ES +k HS P HS +k GS P GS +C ele +C gas +C he

[0147] In the formula, k wt is the unit cost of wind turbine, k pv is the unit cost of the photovoltaic unit, k DG is the unit cost of the gas unit, k P2G is the unit cost of P2G equipment, k EB is the unit cost of electric boiler, k GB is the unit cost of gas boiler, k HS is the unit cost of the heat storage tank, k ES is the unit cost of the battery, k GS is the unit cost of the gas tank, C ele is the electricity purchase cost, C gas is the gas purchase cost, C he The cost of purchasing heat.

[0148] 4 Example Analysis

[0149] This paper selects a comprehensive energy system of a certain park for example analysis. Figure 2 As shown, it can be seen that 8:00-20:00 is the peak time of power load in this system.

[0150] The fixed cost of the system is composed of one-time investments in various types of equipment. The unit investment of each device in the market and its rated power are shown below:

[0151] Table 1 Unit investment and construction cost of each equipment

[0152] equipment Unit investment (yuan / kW) Photovoltaic unit 12000 gas turbine 8112 Electric hydrogen production equipment 800 Electric boiler 1047 Gas boiler 782

[0153] The purchase and sale prices of electricity between the integrated energy system and the main grid are divided into four sections according to the local industrial electricity prices. The peak hours are 11:00-14:00 and 16:00-18:00, and the purchase price is 1.05 yuan / kWh; the off-peak hours are 10:00-11:00, 14:00-16:00, and 18:00-21:00, and the purchase price is 0.95 yuan / kWh; the normal hours are 07:00-10:00 and 21:00-24:00, and the purchase price is 0.65 yuan / kWh; the off-peak hours are 00:00-07:00, and the purchase price is 0.38 yuan / kWh.

[0154] Using the model in Section 3, the comprehensive energy system of the park can be calculated to obtain the output of each device in different time periods with the lowest total system cost, such as Figure 3 shown.

[0155] As can be seen from the figure, due to the relatively economical unit cost of gas turbines, the system utilizes the most gas turbines, which is far higher than photovoltaic power generation equipment. The peak and valley periods of hydrogen generated by the electric hydrogen production equipment correspond to the trend of the park's gas load curve, and the peak and valley periods of heat production by electric boilers correspond to the park's heat load. The typical daily maximum output of each device is shown in the following table:

[0156] Table 2 Typical daily maximum output of each device

[0157] equipment Maximum output(MW) Photovoltaic unit 10.374 gas turbine 28.773 Electric hydrogen production equipment 14.214 Electric boiler 13.42 gas tank 10.432

[0158] The maximum output obtained from the table can be used to set the capacity of the integrated energy system in the park. In order to ensure the stability of energy supply during peak hours and the lowest cost in the park, the output margin is set to 1%.

[0159] Combining the unit cost of each equipment, the total cost of the comprehensive energy system planning is 352,800 yuan. Among them, the gas turbine cost is the highest, which is 183,800 yuan, followed by the photovoltaic unit capacity cost, which is 125,700 yuan. The costs of hydrogen production equipment, electric boilers, and gas storage tanks are 11,500 yuan, 20,600 yuan, and 11,200 yuan, respectively.

[0160] This paper first analyzes the characteristics of each power entity, thermal entity, natural gas and energy storage entity in the park-level electric-heat-gas integrated energy system. Secondly, taking the minimum operation cost as the objective function and considering the output constraints of each system, an optimized operation model of the integrated energy system is proposed. Finally, a case analysis of a park integrated energy system is selected to study the output of each equipment in different time periods under the lowest total system cost, and the planning cost of the integrated energy system is obtained by combining the unit cost of each equipment.

[0161] In summary, as my country's environmental and climate problems become increasingly serious, the integrated energy system is booming. However, the coupling between the systems is not strong, and there is an urgent need to increase the coupling between multiple systems. This paper takes the minimum total cost of the integrated energy system as the objective function, considers the separate operation and coupled transformation of the three parts of the power system, natural gas system, and thermal system within the system, and constructs a system planning model that meets the three types of loads in the system, namely, electrical load, thermal load, and gas load, thereby increasing the coupling of the system, ensuring the reliable operation of the integrated energy system, and improving the efficiency of energy utilization.

[0162] The above are only preferred embodiments of the present invention, and certainly cannot be used to limit the scope of rights of the present invention. Therefore, equivalent changes made according to the scope of the patent application of the present invention still fall within the protection scope of the present invention.

Claims

1. A comprehensive energy system operation optimization model, characterized in that: It includes a regional energy system control center and various production equipment, conversion equipment and storage equipment. The regional energy system control center is connected to various production equipment, conversion equipment and storage equipment respectively. The storage equipment is connected to various production equipment and conversion equipment respectively. The regional energy system control center is connected to energy consumption side modules and energy supply side modules respectively. The integrated energy system operation optimization model is constructed with the lowest integrated energy system optimization operation cost as the objective function: in, P wt It is the maximum power output of the wind power generation system in 24 hours. P pv It is the maximum output power of the photovoltaic power generation system in 24 hours. P DG It is the maximum output power of the gas generator set in 24 hours. P P2G The maximum output power of P2G in 24 hours. P EB The maximum output power of the CLP boiler at 24 hours. P GB It is the maximum output power of the gas boiler in 24 hours. P ES The maximum power storage capacity in 24 hours. P HS The maximum hydrogen storage power in 24 hours. P GS It is the maximum gas storage power in 24 hours; is the unit cost of wind turbine generator set, is the unit cost of the photovoltaic unit, is the unit cost of the gas unit, is the unit cost of P2G equipment, is the unit cost of electric boiler, is the unit cost of gas boiler, is the unit cost of the heat storage tank, The unit cost of the energy storage battery is is the unit cost of the gas tank, The cost of purchasing electricity, is the gas purchase cost, The cost of purchasing heat; The production equipment and conversion equipment of the integrated energy system are classified into electric power system, natural gas system and heating and cooling system. The electric power in the whole area of ​​the integrated energy system operation optimization model needs to maintain a balanced state, including electric power balance, thermal power balance and gas power balance; Electrical power balance: In the formula, For the user's electricity load, P pv,t is the power generation of the photovoltaic power generation system at time t, P w,t is the wind power output power of the wind power generation system at time t, P DG,t is the power of the gas unit, P P2G,t The power of gas generated by P2G power conversion, P ES,t For batteries t Gas retention efficiency at all times; Thermal power balance: In the formula, For user heat load, P EB,t is the thermal output power of the electric boiler at time t, P GB,t is the thermal output power of the gas boiler at time t, P HS,t For heat storage tank t Gas retention efficiency at all times; Gas power balance: In the formula, For users' gas load, is the power of gas generated by P2G at time t, is the gas retention power of the gas tank at time t; In the formula, Installing capacity for photovoltaics; is the sunshine intensity; is the photoelectric conversion efficiency; Wind power generation system In the formula, represents the rated power of wind power output at time t; For wind turbines; In the formula, is the power of the gas unit, is the upper limit of gas unit power, is the lower limit of gas unit power, is the lower limit of the gas unit climbing power, It is the upper limit of the ramp power of the gas generator set; In the formula, The power of gas generated by P2G power conversion, is the electrical power input to P2G, For P2G equipment efficiency; is the gas storage power of the battery at time t, is the heat storage power of the heat storage tank, Heat retention efficiency, Release power for the gas tank, is the gas release efficiency; In the formula, is the thermal output power of the electric boiler, is the electric boiler power, is the electricity-to-heat efficiency of the electric boiler; In the formula, is the thermal output power of the gas boiler, Gas-to-heat efficiency of gas boilers, Gas power for gas boiler; is the gas retention power of the heat storage tank at time t, is the heat storage power of the heat storage tank, Heat retention efficiency, Release power for the gas tank, is the gas release efficiency; In the formula, is the power of gas generated by P2G at time t, is the electrical power input to P2G, For P2G equipment efficiency; is the gas retention power of the gas tank at time t, Store power for the gas tank, is the gas retention efficiency, Release power for the gas tank, is the gas release efficiency.

2. The integrated energy system operation optimization model according to claim 1 is characterized in that: Production equipment includes renewable power generation systems, photovoltaic power generation systems, combined heat and power units, and combined cooling, heating and power systems; Conversion equipment includes gas turbines, gas boilers, and hydrogen fuel cells; Storage equipment includes energy storage batteries, heat storage tanks and gas storage tanks.

Images