CN116402295B - Mine comprehensive energy system optimal scheduling method and system for electric-to-gas mixing coal bed gas - Google Patents

Abstract

The invention discloses a method and system for optimizing the dispatching of comprehensive energy systems in mines where electricity is converted to gas and coalbed methane is mixed. The method includes: converting electricity to gas to absorb high-concentration gas converted by abandoned wind and light and coalbed methane containing low-concentration gas. Blending is carried out, and at the same time, the idle underground space of the mine is transformed into an underground gas storage in conjunction with power-to-gas conversion, forming a gas blending and utilization model of different concentrations in which power-to-gas-coalbed methane-underground gas storage is coupled with each other; according to the comprehensive energy of the mine System parameters and gas blending and utilization modes of different concentrations were used to establish an optimal dispatching model of the mine's comprehensive energy system for power-to-gas-mixed coal-bed methane. Through the established optimal dispatching model of the mine's comprehensive energy system, a solver was called to solve the problem. The present invention establishes an optimal dispatching model for a mine's comprehensive energy system that considers power-to-gas mixing with coalbed methane, power-to-gas and underground gas storage synergy, comprehensively considers multiple operating constraints, and optimizes and coordinates the operation of multiple energy conversion devices.

Description

A method for optimizing the scheduling of comprehensive energy systems in mines where electricity is converted to gas and coalbed methane is mixed with coalbed methane. system

Technical field

The invention belongs to the comprehensive energy system optimization operation technology, and in particular relates to a mine comprehensive energy system optimization dispatching method and system for converting electricity into gas and mixing coal bed methane.

Background technique

As my country's main energy source, coal has high energy consumption and high pollution characteristics. How to improve the energy utilization efficiency of coal mines, reduce environmental pollution in the process of coal mine energy use, and achieve low-carbon energy supply in coal mines are issues of common concern to society under the dual-carbon goal. The mine's comprehensive energy system integrates the coal mine's multi-temporal and spatial distribution resources to accurately match the coal mine's source-end energy production and load-end energy consumption, and achieves coordinated planning, optimized operation, and complementarity among the coal mine's multiple heterogeneous energy subsystems; in Meeting the diversified energy needs of coal mines while improving the overall energy utilization efficiency, economic and environmental benefits of coal mines is an important development direction for realizing low-carbon energy supply in coal mines.

The coal mining process will produce coal-associated resources such as coal bed methane, lack of wind, and water inrush. The recycling and utilization of coal-associated resources has received widespread attention in recent years. Coal mines are rich in coal-associated resources, which contain a large amount of chemical energy and thermal energy, which can be converted into electricity, heat and other energy for production and daily life through efficient energy conversion devices such as thermal storage oxidation devices, air source heat pumps, and water source heat pumps. However, the amount of coalbed methane in different coal mines is different, making it difficult to implement a unified resource utilization model. At the same time, most of my country's coal resources are distributed in North China and Northwest China, and there are large amounts of renewable energy distributed in these areas. Due to the particularity of coal mine production and endogenous resources, traditional new energy consumption methods are difficult to effectively utilize in coal mine energy systems. . Therefore, the differentiated recovery methods of coal mine associated resources and the demand for wind and solar consumption must be fully considered during the optimization and dispatching process of the comprehensive energy system of mines. At present, most comprehensive energy systems in coal mines recover coalbed methane separately. There is no consideration for blending it with the high-concentration gas produced by power-to-gas. At the same time, there is no structure that utilizes underground gas storage and power-to-gas for coordinated operation.

Therefore, there is an urgent need for an optimized dispatching method for the integrated energy system of mines in which coal-bed methane is mixed with electricity and gas to solve the problems of different concentrations of gas blending, underground gas storage and power-to-gas coordinated operation in optimal dispatch, and to improve the operating economy of the integrated energy system of mines. nature, associated resource utilization efficiency and scenery absorption level.

Contents of the invention

In view of the problems existing in the above-mentioned prior art, the present invention provides a method and system for optimizing the dispatching of a comprehensive energy system in a mine that converts electricity into gas and mixes coal bed methane.

In order to achieve the above objects, the present invention is implemented through the following technical solutions:

The invention provides a method for optimizing the dispatching of comprehensive energy systems in mines where electricity is converted to gas and coalbed methane is mixed with coalbed methane. The method includes:

The high-concentration gas converted by power-to-gas consumption to absorb wind and light abandonment is blended with coal-bed methane containing low-concentration gas. At the same time, the idle underground space of the mine is transformed into an underground gas storage to cooperate with power-to-gas for gas blending to form a power-to-gas - Gas blending and utilization model of different concentrations coupled with coalbed methane and underground gas storage;

Based on the composition and parameters of the mine's comprehensive energy system and the mixing and utilization modes of different concentrations of gas, establish an optimal dispatching model for the mine's comprehensive energy system that converts electricity to gas and mixes coalbed methane;

Through the established mining comprehensive energy system optimization dispatch model, the solver is called for solution; the solution results include the total system operating cost, wind and light abandonment rate, power to gas and underground gas storage operation status, system power balance status, blending Changes in gas concentration and flow rate before and after.

In one embodiment, the gas blending and utilization mode of different concentrations coupled with the power-to-gas-coalbed methane-underground gas storage is expressed as:

In the formula, is the total amount of high-concentration gas produced by power-to-gas at time t; a is the conversion coefficient of power-to-gas output gas power converted into gas volume;/> It is the gas flow rate of the high-concentration gas produced by power-to-gas mixing at time t;/> is the gas injection flow rate of the underground gas storage at time t;/> is the high-concentration gas flow rate mixed at time t;/> is the gas release flow rate of the underground gas storage at time t;/> is the gas volume after mixing at time t;/> is the coalbed methane flow rate extracted at time t.

In one embodiment, the mine comprehensive energy system consists of: wind turbine power generation unit, photovoltaic power generation unit, grid power supply unit, coal bed methane utilization unit, ventilated air utilization unit, water inrush utilization unit, electricity to gas unit, and gas blending unit. , thermal storage oxidation unit, water source heat pump unit, gas turbine unit, waste heat boiler unit, absorption refrigerator unit, underground gas storage unit, thermal storage device unit, electric load unit, heating load unit and cooling load unit.

In one embodiment, the mine comprehensive energy system parameters include: predicted values of electrical load, heat load, cooling load, fan output, photovoltaic output, coal bed methane, exhausted air, and water inrush, system equipment composition, equipment operation parameters, The initial value of the current gas storage volume in the underground gas storage.

In one embodiment, the optimized scheduling model of the mine's comprehensive energy system of power-to-gas-mixed coal-bed methane is: the minimum operating cost of the mine's comprehensive energy system within one scheduling cycle is an objective function and multiple constraints; within one scheduling cycle The minimum operating cost is the objective function:

minC2C ₁ +C ₂ +C ₃ +C ₄

In the formula, C, C ₁ , C ₂ , C ₃ and C ₄ are respectively the total operating cost of the system, power purchase cost, equipment operation and maintenance cost, wind and light abandonment penalty cost and initial capacity natural gas purchase cost in the underground gas storage. ;T is the total number of time periods in a complete scheduling cycle; Purchase power for the system at time t;/> is the electricity price at time t; μ _PV , μ _WT , μ _GT , μ _WHB , μ _UGS , μ _P2G , μ _WSHP , μ _RTO , μ _AC , and μ _HSD are photovoltaic, wind turbine, gas turbine, waste heat boiler, and underground gas storage respectively. , unit maintenance costs of power-to-gas, water source heat pumps, thermal storage oxidation devices, absorption refrigerators, and thermal storage devices;/> They are the output power of photovoltaics, fans, gas turbines, waste heat boilers, power-to-gas, thermal storage oxidation devices, and absorption refrigerators at time t; They are the gas release and injection flow rates in the underground gas storage at time t;/> is the outflow volume at time t; are the thermal discharge and thermal storage power of the thermal storage device at time t respectively; k _PV and k _wT are the penalty coefficients of light and wind abandonment respectively; They are the predicted values of photovoltaic and wind turbine output power at time t;/> is the initial capacity of the underground gas storage; p _G is the price of natural gas;

Multiple constraints include: underground gas storage operation constraints and coalbed methane mixing high-concentration gas balance constraints.

In one embodiment, the operation constraints of the underground gas storage are:

In the formula, are the gas storage amounts in the underground gas storage at time t and t-1 respectively;/> are the gas injection flow and release flow of the underground gas storage at time t respectively;/> They are the minimum and maximum injection flow rate of the underground gas storage respectively;/> They are the minimum and maximum release flow rates of underground gas storage;/> It is a 0/1 variable, which respectively represents the status of gas injection and gas release in the underground gas storage at time t. 0 means closed and 1 means open.

In one embodiment, the balance constraint of the coal bed methane mixed with high concentration gas is:

In the formula, is the gas volume after mixing at time t;/> It is the gas flow rate of the high-concentration gas produced by power-to-gas mixing at time t;/> is the gas release flow rate of the underground gas storage at time t;/> is the coalbed methane flow rate extracted at time t;/> is the gas flow rate injected into the gas turbine at time t;/> is the gas concentration injected into the gas turbine at time t;/> It is the concentration of gas generated from electricity-to-gas conversion at time t;/> is the gas concentration in the coalbed methane extracted at time t;/> They are respectively the minimum and maximum gas concentrations required to ensure normal combustion of gas turbines for power generation.

In one embodiment, the plurality of operation constraints also include: operation constraints of thermal storage oxidation device, gas turbine operation constraints, power-to-gas operation constraints, water source heat pump operation constraints, absorption refrigerator operation constraints, waste heat boiler operation constraints, storage Thermal device operation constraints and system power balance constraints.

In one implementation, the solver is a GUROBI solver.

The invention also provides a mine comprehensive energy system optimization and dispatching system that converts electricity to gas and mixes coal bed methane, including: different concentrations of gas blending and utilization mode modules, a mine comprehensive energy system optimization dispatch model module and a solution module;

The different-concentration gas blending and utilization mode module is used to blend the high-concentration gas converted by power-to-gas consumption, abandoning wind and light, and the coal-bed methane containing low-concentration gas, and at the same time transform the idle underground space of the mine into underground storage. The gas bank cooperates with power-to-gas conversion to mix gas, forming a gas blending and utilization model of different concentrations in which power-to-gas-coalbed methane-underground gas storage is coupled with each other;

The mine comprehensive energy system optimization dispatch model module is used to establish an optimization dispatch model of the mine comprehensive energy system that converts electricity to gas and mixes coal-bed methane based on the parameters of the mine's comprehensive energy system and the gas blending and utilization modes of different concentrations;

The solving module is used to call the solver to solve through the established mining comprehensive energy system optimization dispatch model; the solving results include the total operating cost of the system, wind and light abandonment rate, power to gas conversion and underground gas storage operation status, System power balance, gas concentration and flow changes before and after blending.

Beneficial effects of the present invention:

The optimized dispatching method of the comprehensive energy system of the mine that considers the use of electricity to gas mixed with coal-bed methane is based on solving the optimal dispatching problem of the utilization of coal-related resources and the demand for wind and solar accommodation in the comprehensive energy system of the mine. It fully considers the impact of electricity-to-gas mixed with coal-bed methane. The improvement of associated resource utilization and wind and solar consumption, the multi-link operation constraints of the system, and the coordination between power-to-gas and underground gas storage have formed a new energy consumption method with distinctive coal mine characteristics, and established a new energy consumption method that includes power-to-gas, underground gas storage, etc. The optimized dispatch model of the comprehensive energy system of the mine with gas storage and gas mixing is solved by calling the relevant mathematical solver to obtain the mine's day-ahead dispatch plan.

Description of the drawings

The drawings, as part of the present invention, are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention, but do not constitute an improper limitation of the present invention. Obviously, the drawings in the following description are only some embodiments. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without exerting creative efforts.

Figure 1 is a flow chart of the optimization and dispatching method of the comprehensive energy system of a mine that converts electricity into gas and mixes coal bed methane according to one embodiment of the present invention;

Figure 2 is a multi-resource recycling architecture diagram of a mine comprehensive energy system provided by an embodiment of the present invention;

Figure 3 is a diagram showing the gas distribution results during the coordinated operation of power-to-gas and underground gas storage provided by one embodiment of the present invention;

Figure 4 is an electric power balance diagram of a mine comprehensive energy system provided by an embodiment of the present invention;

Figure 5 is a thermal power balance diagram of a mine comprehensive energy system provided by an embodiment of the present invention;

Figure 6 is a cold power balance diagram of a mine comprehensive energy system provided by an embodiment of the present invention;

Figure 7 is a diagram showing changes in gas concentration and flow rate before and after mixing according to an embodiment of the present invention.

It should be noted that these drawings and text descriptions are not intended to limit the scope of the invention in any way, but are intended to illustrate the concept of the invention for those skilled in the art by referring to specific embodiments.

Detailed ways

The optimized dispatching method of the mine's comprehensive energy system considering power-to-gas-mixed coal-bed methane proposed by the present invention will be described in detail below with reference to the embodiments and the accompanying drawings.

The optimized dispatching method of the mine's comprehensive energy system considering power-to-gas mixed with coalbed methane is shown in Figure 1 and specifically includes the following steps:

Step S100: Blend the high-concentration gas converted by power-to-gas to absorb wind and light abandonment with coal-bed methane containing low-concentration gas. At the same time, the idle underground space of the mine is transformed into an underground gas storage to cooperate with power-to-gas for gas blending. Form a gas blending and utilization model of different concentrations that is coupled with power-to-gas-coalbed methane-underground gas storage;

In the embodiment of this application, the gas blending and utilization mode of different concentrations coupled with the power-to-gas-coalbed methane-underground gas storage is expressed as:

In the formula, is the total amount of high-concentration gas produced by power-to-gas at time t; a is the conversion coefficient of power-to-gas output gas power converted into gas volume;/> It is the gas flow rate of the high-concentration gas produced by power-to-gas mixing at time t;/> is the gas injection flow rate of the underground gas storage at time t;/> is the high-concentration gas flow rate mixed at time t;/> is the gas release flow rate of the underground gas storage at time t;/> is the gas volume after mixing at time t;/> is the coalbed methane flow rate extracted at time t.

Furthermore, the mine's comprehensive energy system consists of: wind turbine power generation unit, photovoltaic power generation unit, grid power supply unit, coal bed methane utilization unit, exhausted air utilization unit, water inrush utilization unit, power to gas unit, gas blending unit, thermal storage oxidation unit, water source Heat pump unit, gas turbine unit, waste heat boiler unit, absorption chiller unit, underground gas storage unit, thermal storage device unit, electrical load unit, heating load unit and cooling load unit.

Furthermore, the comprehensive energy system parameters of the mine include: electrical load, heat load, cooling load, fan output, photovoltaic output, predicted values of coal bed methane, exhausted air, and water inrush, system equipment composition, equipment operation parameters, and currently stored gas in the underground gas storage The initial value of the quantity.

Specifically, in this embodiment, the predicted values of electric load, heating load, cooling load, fan output, photovoltaic output, coal bed methane, ventilation air, and water inrush for a dispatch period of the system are first input; then the system equipment composition and equipment operation parameters are input , the initial value of variables or parameters such as the current storage gas volume of the underground gas storage. Among them, fans, photovoltaics, power grids and gas turbines meet the power demand; waste heat boilers and thermal storage devices meet the heat load demand; absorption chillers and water source heat pumps meet the cooling load demand; the thermal storage oxidation device uses catalytic oxidation to convert the exhaust air into The chemical energy is converted into thermal energy; the power-to-gas device consumes electric energy to perform a methanation reaction to generate high-concentration gas. Part of the high-concentration gas is mixed with the coalbed methane, and the remaining part is injected into the underground gas storage for storage; the underground gas storage shuts down during the power-to-gas conversion The stage provides a high-concentration gas source; the gas turbine generates electricity by burning the mixed gas, and the waste heat generated is absorbed by the waste heat boiler/absorption refrigerator for heating/cooling. The multi-resource recycling architecture of the mine's comprehensive energy system is shown in Figure 2, and the detailed parameters of the system equipment are shown in Table 1.

Table 1 System composition and parameters

Step S200: Based on the composition and parameters of the mine's comprehensive energy system and the gas blending and utilization modes of different concentrations, establish an optimal dispatching model for the mine's comprehensive energy system that converts electricity to gas and mixes coalbed methane;

my country's coal mines are mostly distributed in areas rich in new energy power generation resources such as Northwest and North China, and there are often a large number of wind and solar abandonment phenomena; the coal mine resource endowment includes traditional coal resources as well as coal bed methane, lack of wind, and water inflows derived from the coal mining process. Associated resources; The geological characteristics of coal mines are unique, and a large amount of idle underground space is often formed underground during the mining process. Based on the above factors, the abandoned wind and light in the power-to-gas consumption system are used to convert it into high-concentration gas for blending with coal-bed methane containing low-concentration gas; at the same time, the idle underground space of the coal mine is transformed into an underground gas storage. The function of the gas storage is to provide high-concentration gas supplement when the high-concentration gas produced by power-to-gas is insufficient during the blending process, and to store excessive high-concentration gas when power-to-gas is produced, thus forming a power-to-gas-coalbed methane-underground The mutually coupled gas storage mixing and utilization modes of different concentrations effectively promote the wind and solar absorption of the mine's comprehensive energy system and improve the utilization efficiency of coal-associated resources.

The power-to-gas-coalbed methane-underground gas storage mutually coupled gas mixing and utilization model of different concentrations, in which the role of power-to-gas is to absorb the abandoned wind and light in the system and convert it into high-concentration gas to supply low-concentration gas The coalbed methane is blended. The function of the underground gas storage is to provide high-concentration gas supplementation when the high-concentration gas produced by power-to-gas is insufficient during the blending process, and to store excessive high-concentration gas produced by power-to-gas, effectively promoting It improves the wind and solar absorption of the mine's comprehensive energy system and improves the utilization efficiency of coal associated resources.

In the embodiment of this application, the optimal dispatching model of the mine's comprehensive energy system that converts electricity to gas and mixes coalbed methane is: the minimum operating cost of the mine's comprehensive energy system within one scheduling cycle is the objective function and multiple constraints.

The minimum operating cost within a scheduling cycle is the objective function:

minC＝C ₁ +C ₂ +C ₃ +C ₄ (5)

In the formula, C, C ₁ , C ₂ , C ₃ and C ₄ are respectively the total operating cost of the system, power purchase cost, equipment operation and maintenance cost, wind and light abandonment penalty cost and initial capacity natural gas purchase cost in the underground gas storage. ;T is the total number of time periods in a complete scheduling cycle; Purchase power for the system at time t;/> is the electricity price at time t; μ _PV , μ _WT , μ _GT , μ _WHB , μ _UGS , μ _P2G , μ _WSHP , μ _RTO , μ _AC , and μ _HSD are photovoltaic, wind turbine, gas turbine, waste heat boiler, and underground gas storage respectively. , unit maintenance costs of power-to-gas, water source heat pumps, thermal storage oxidation devices, absorption refrigerators, and thermal storage devices;/> They are the output power of photovoltaics, fans, gas turbines, waste heat boilers, power-to-gas, thermal storage oxidation devices, and absorption refrigerators at time t;/> They are the gas release and injection flow rates in the underground gas storage at time t;/> is the outflow volume at time t; are the thermal discharge and thermal storage power of the thermal storage device at time t respectively; k _PV and k _WT are the penalty coefficients of light and wind abandonment respectively; They are the predicted values of photovoltaic and wind turbine output power at time t;/> is the initial capacity of the underground gas storage; p _G is the price of natural gas.

Multiple constraints include: underground gas storage operation constraints and coalbed methane mixing high-concentration gas balance constraints.

Furthermore, the operating constraints of the underground gas storage are:

In the formula, are the gas storage amounts in the underground gas storage at time t and t-1 respectively;/> are the gas injection flow and release flow of the underground gas storage at time t respectively;/> They are the minimum and maximum injection flow rate of the underground gas storage respectively;/> They are the minimum and maximum release flow rates of underground gas storage;/> It is a 0/1 variable, which respectively represents the status of gas injection and gas release in the underground gas storage at time t. 0 means closed and 1 means open.

Furthermore, the balance constraints of coal bed methane mixed with high concentration gas are:

In the formula, is the gas volume after mixing at time t;/> It is the gas flow rate of the high-concentration gas produced by power-to-gas mixing at time t;/> is the gas release flow rate of the underground gas storage at time t;/> is the coalbed methane flow rate extracted at time t;/> is the gas flow rate injected into the gas turbine at time t;/> is the gas concentration injected into the gas turbine at time t;/> It is the concentration of gas generated from electricity-to-gas conversion at time t;/> is the gas concentration in the coalbed methane extracted at time t;/> They are respectively the minimum and maximum gas concentrations required to ensure normal combustion of gas turbines for power generation.

In a possible implementation, the multiple operating constraints also include: operating constraints of the thermal storage oxidation device, gas turbine operating constraints, power-to-gas operating constraints, water source heat pump operating constraints, absorption refrigerator operating constraints, waste heat boiler operating constraints, storage Thermal device operation constraints and system power balance constraints.

Furthermore, the operating constraints of the thermal storage oxidation device are:

In the formula, are the output thermal power of the thermal storage oxidation device at time t and t-1 respectively; η _RTO is the thermal conversion efficiency of the thermal storage oxidation device;/> is the concentration of CH ₄ in VAM at time t; C _CH4 is the low heating value of gas;/> is the exhaust air flow rate input to the thermal storage oxidation device at time t;/> It is the maximum output thermal power of the thermal storage oxidation device, the same below;/> They are the upper and lower limits of the climbing power of the thermal storage and oxidation device respectively, the same below.

Further, the gas turbine operating constraints are:

In the formula, are the output electric power of the gas turbine at time t and t-1 respectively; η _GT is the power generation efficiency of the gas turbine;/> is the gas concentration input to the gas turbine at time t;/> is the gas flow rate input to the gas turbine at time t;/> is the output waste heat power of the gas turbine at time t;/> is the heat loss coefficient of the gas turbine.

Furthermore, the power-to-gas operation constraints are:

In the formula, is the power of gas produced from electricity to gas at time t; η _P2G is the conversion efficiency of electricity to gas;/> is the electrical power input from electricity to gas at time t.

Furthermore, the operating constraints of the underground gas storage are:

In the formula, are the gas storage amounts in the underground gas storage at time t and t-1 respectively;/> are the gas injection flow and release flow of the underground gas storage at time t respectively;/> They are the minimum and maximum injection flow rate of the underground gas storage respectively;/> They are the minimum and maximum release flow rates of underground gas storage;/> It is a 0/1 variable, which respectively represents the status of gas injection and gas release in the underground gas storage at time t. 0 means closed and 1 means open.

Furthermore, the water source heat pump operation constraints are:

In the formula, are the cooling power of the water source heat pump at time t and t-1 respectively; η _WSHP is the cooling correlation coefficient of the water source heat pump;/> is the water inflow of the system at time t.

Furthermore, the operation constraints of the absorption refrigerator are:

In the formula, are the refrigeration power of the absorption refrigerator at time t and t-1 respectively;/> is the refrigeration energy efficiency coefficient of the absorption refrigerator;/> is the waste heat input power of the absorption refrigerator at time t.

Furthermore, the operating constraints of the waste heat boiler are:

In the formula, are the heat production power of the waste heat boiler at time t and t-1 respectively;/> is the heating energy efficiency coefficient of the waste heat boiler;/> is the waste heat input power of the waste heat boiler at time t.

Furthermore, the operating constraints of the thermal storage device are:

In the formula, are the heat storage capacity of the thermal storage device at time t and t-1 respectively;/> are the self-loss rate, heat storage and heat release efficiency of the heat storage device respectively;/> are the heat storage and heat release power of the heat storage device at time t respectively; It is a 0/1 variable, which respectively represents the heat storage and heat release opening and closing states of the heat storage device at time t.

Furthermore, the system power balance constraints are:

In the formula, are the photovoltaic and wind turbine power consumed by the system at time t respectively;/> Purchase electricity for the system at time t;/> are the system electricity, heating, and cooling load demands at time t, respectively.

Step S300: Through the established mining comprehensive energy system optimization dispatch model, call the solver for solution; the solution results include the total system operating cost, wind and light abandonment rate, power to gas and underground gas storage operation status, and system power balance status. , changes in gas concentration and flow rate before and after blending.

Furthermore, the solver is GUROBI solver.

The present invention establishes an optimal dispatching method for a mine's comprehensive energy system that considers power-to-gas mixing with coalbed methane. It uses a relevant solver to solve the problem and obtains the system operation plan within the dispatching period.

In one embodiment, a mine comprehensive energy system optimized dispatching system for power-to-gas-mixed coal-bed methane is proposed. The system includes: different concentrations of gas blending and utilization mode modules, a mine integrated energy system optimized dispatch model module and a solution module;

The different concentration gas blending and utilization mode module is used to blend the high-concentration gas converted by power-to-gas consumption, abandoned wind and light, with the coalbed methane containing low-concentration gas, and at the same time, use the idle underground space of the mine to transform into an underground gas storage Coordinate power-to-gas conversion for gas blending to form a gas blending and utilization model of different concentrations that is coupled with power-to-gas-coalbed methane-underground gas storage;

The mine comprehensive energy system optimization dispatch model module is used to establish the mine comprehensive energy system optimization dispatch model based on the mine comprehensive energy system parameters and different concentrations of gas blending and utilization modes.

The solving module is used to call the solver for solving through the established mining comprehensive energy system optimization dispatch model; the solving results include the total system operating cost, wind and light abandonment rate, power to gas and underground gas storage operation status, system power Balance conditions, changes in gas concentration and flow rate before and after blending.

It should be noted that when the optimized dispatching system for the mine comprehensive energy system of power-to-gas mixed with coal-bed methane provided in the above embodiments is executed, the optimization and dispatching method of the mine-integrated energy system of power-to-gas mixed with coal-bed methane is only based on the division of each functional module mentioned above. For example, in actual applications, the above function allocation can be completed by different functional modules as needed, that is, the internal structure of the device is divided into different functional modules to complete all or part of the functions described above. In addition, the optimization and dispatching system of the mine's comprehensive energy system of power-to-gas mixed with coal-bed methane provided in the above embodiments and the embodiment of the optimization and dispatching method of the mine's comprehensive energy system of power-to-gas and coal-bed methane are of the same concept. For details of the implementation process, see Power-to-Gas The embodiment of the optimal dispatching method for the comprehensive energy system of a mine mixed with coalbed methane will not be described again here.

In view of the characteristics of the system that need to recycle coal associated resources and absorb wind and solar energy, compare the operation of the system under different system configuration schemes. Scheme 1 does not configure power-to-gas and underground gas storage, scheme 2 only configures power-to-gas, and scheme 3 only configures For underground gas storage, Plan 4 is equipped with both power-to-gas and underground gas storage. The operation results are shown in Table 2.

Table 2 Comparison of running results of different system configuration schemes

The computer hardware environment for performing optimization calculations is Inter(R)Core(TM) i7-11370H, with a main frequency of 3.30GHz and a memory of 16GB; the software environment is the Windows 11 operating system.

Comparing the operation results of Scheme 1 and Scheme 2 in different system configuration schemes, it can be seen that after equipped with electricity-to-gas conversion, the electric power is consumed during the period of wind and light abandonment, and the electric energy is converted into gas, which significantly reduces the system wind and light abandonment rate. However, due to reasons such as high power-to-gas maintenance costs and high power consumption, adopting a single power-to-gas optimization schedule will increase the operation and scheduling costs of the system. Comparing the operation results of Scheme 1 and Scheme 3, it can be seen that only underground gas storage cannot handle the waste. The total operating cost of the system will increase as the gas passes through the underground gas storage and incurs additional operation and maintenance costs.

Comparing Scheme 1 and Scheme 4, Scheme 4 is equipped with both power-to-gas and underground gas storage. The complementary operation of power-to-gas and underground gas storage is coordinated through the dispatching strategy. The total operating cost of the system is greatly reduced. Among all schemes, it is more economical and wind-free. Abandoned light absorption has the best effect. From the above comparative analysis, it can be concluded that configuring power-to-gas and underground gas storage at the same time can reduce the operating cost of the system and improve the wind and solar absorption capacity of the system, and the optimization of scheduling strategies can better coordinate the power-to-gas and underground gas storage. Operation, giving full play to the advantages of coordination and complementarity among various equipment, fully tapping the economic improvement potential, and having good application value.

Figure 3 shows the gas distribution results during the coordinated operation of power-to-gas and underground gas storage. In Figure 3, during the period when there is no wind or light abandonment (20:00-06:00), the system blends high-concentration gas and coalbed methane stored in the underground gas storage to ensure the normal operation of the gas turbine; while during During periods when wind and solar power are abandoned, the high-concentration gas produced by power-to-gas conversion is prioritized to ensure blending needs, and excess gas is injected into underground gas storage for storage. Therefore, the gas storage capacity of underground gas storage shows a trend of first decreasing, then increasing, and then decreasing again. Figure 4 is the electric power balance diagram of the mine's comprehensive energy system. In Figure 4, the mining area arranges maintenance from 11:00 to 16:00, and no coal is mined during the maintenance period. The electric load demand is at the lowest level throughout the day from 10:00 to 12:00, which is at the peak of photovoltaic output and there is a large amount of abandoned light power; similarly, during 07:00-09:00 and 14:00-19: During the 00 period, there is also a situation where wind and solar output is greater than the electricity load demand. Power-to-gas converts this part of abandoned wind and light into high-concentration gas for storage and consumption. During the 22:00-05:00 period, due to low wind and solar output, there is an electric power shortage. At the same time, affected by peak and valley electricity prices, most of the electric power shortage is made up by power grid purchases. Figure 5 is the thermal power balance diagram of the mine's comprehensive energy system.

In Figure 5, the heat load demand of the system is mainly supplied by the waste heat boiler, and a heat storage device is also equipped to adjust the imbalance of the spatial and temporal distribution of heat energy in the system. During 21:00-23:00 and 01:00-05:00, the heating power of the waste heat boiler is greater than the thermal power required by the system, so the thermal storage device stores this excess thermal power; during 06:00-10 When there is a thermal power shortage in the system during the :00 and 24:00 hours, the heat storage device will supplement it, which better realizes the role of the heat storage device in peak-cutting and valley-filling of the system's thermal energy. Figure 6 Cold power balance diagram of the mine's comprehensive energy system. In Figure 6, most of the system cooling load demand is provided by the absorption chiller, and the remaining part is provided by the water source heat pump. Figure 7 shows the changes in gas concentration and flow rate before and after mixing. In Figure 7, the gas concentration in coalbed methane is low. By blending with high-concentration gas, the blended gas concentration is increased to meet the gas turbine combustion standards; the blended gas volume is the ratio of coalbed methane flow rate and high concentration. The sum of gas flows.

The present invention closely links the power-to-gas wind and solar consumption with the utilization of coal associated resources. Through the mixing of different concentrations of gas, the synergy and complementation of power-to-gas and underground gas storage, the associated resource utilization efficiency is significantly improved, which not only enhances the system's wind and solar consumption capacity, but also It also reduces system operation and scheduling costs.

In the instructions provided here, a number of specific details are described. However, it is understood that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures, and techniques have not been shown in detail so as not to obscure the understanding of this description.

The above are only preferred embodiments of the present invention, and do not limit the present invention in any form. Although the present invention has been disclosed above in preferred embodiments, it is not intended to limit the present invention. Anyone familiar with the technology of this patent Without departing from the scope of the technical solution of the present invention, personnel can make some changes or modify the above-mentioned technical contents into equivalent embodiments with equivalent changes. Technical Essence Any simple modifications, equivalent changes and modifications made to the above embodiments still fall within the scope of the present invention.

Claims (6)

1. An optimized dispatching method for a mine comprehensive energy system of electric-to-gas mixing coal bed gas is characterized by comprising the following steps:

mixing high-concentration gas converted by electric conversion, wind-abandoning and light-abandoning with coal bed gas containing low-concentration gas, and simultaneously reforming an idle underground space of a mine into an underground gas storage to perform gas mixing in cooperation with electric conversion gas so as to form different-concentration gas mixing utilization modes of electric conversion gas-coal bed gas-underground gas storage mutual coupling;

according to the composition, parameters and different concentration gas mixing utilization modes of the mine comprehensive energy system, establishing an optimal scheduling model of the mine comprehensive energy system of the electric-to-gas mixing coal bed gas;

calling a solver to solve through the established mine comprehensive energy system optimization scheduling model; the solving result comprises the total running cost of the system, the abandoned wind and abandoned light rate, the running condition of the electric gas conversion and underground gas storage, the power balance condition of the system, and the gas concentration and flow change condition before and after blending;

the mixing and utilizing modes of the electric conversion gas, the coal bed gas and the underground gas storage are as follows:

in the method, in the process of the application,the total amount of high-concentration gas produced by electric conversion gas at the moment t; a is a conversion coefficient of converting electric conversion gas output gas power into gas volume; />The high-concentration gas produced by the electric conversion gas at the moment t participates in the mixed gas flow;the gas injection flow of the underground gas storage at the moment t; />The flow rate of the high-concentration gas mixed at the moment t; />The gas release flow of the underground gas storage at the moment t; />The volume of the mixed gas at the time t; />The air flow of the coal seam is extracted at the moment t;

the mine comprehensive energy system optimization scheduling model of the electric conversion gas blending coal bed gas is as follows: the minimum running cost of the mine comprehensive energy system in a scheduling period is an objective function and a plurality of constraints; the minimum running cost in one scheduling period is an objective function:

minC＝C1+C2+C3+C4

in C, C ₁ 、C ₂ 、C ₃ 、C ₄ The system is respectively the total running cost, electricity purchasing cost, equipment operation and maintenance cost, wind and light discarding punishment cost and the initial capacity natural gas purchasing cost in the underground gas storage; t is the total time period number of 1 complete scheduling period;purchasing electric power for the system at the time t; />The electricity price at the time t; mu (mu) _PV 、μ _WT 、μ _GT 、μ _WHB 、μ _UGS 、μ _P2G 、μ _WSHP 、μ _RTO 、μ _AC 、μ _HSD The unit maintenance cost of the photovoltaic device, the fan, the gas turbine, the waste heat boiler, the underground gas storage, the electric conversion gas, the water source heat pump, the heat storage oxidation device, the absorption refrigerator and the heat storage device is respectively; />The output power of the photovoltaic, the fan, the gas turbine, the waste heat boiler, the electric conversion gas, the heat storage oxidation device and the absorption refrigerator at the moment t respectively;the gas release and injection flow in the underground gas storage at the moment t are respectively; />The surge quantity at the moment t;the heat storage power is stored and stored by the heat storage device at the moment t respectively; k (k) _PV 、k _WT Penalty coefficients for light and wind rejection are respectively;respectively obtaining predicted values of output power of the photovoltaic and the fan at the moment t; />Initial capacity for underground reservoirs; p is p _G Is the price of natural gas;

the plurality of constraints includes: the operation constraint of the underground gas storage and the balance constraint of the coalbed methane blending high-concentration gas;

the operation constraint of the underground gas storage is as follows:

in the method, in the process of the application,the gas storage amounts in the underground gas storage at the time t and the time t-1 are respectively; />Respectively the gas injection flow and the release flow of the underground gas storage at the moment t; />The minimum and maximum injection flow of the underground gas storage are respectively; />The minimum and maximum release flow of the underground gas storage are respectively; />The variable is 0/1, which respectively represents the state of the underground gas storage in injecting and releasing gas at the moment t, 0 represents closing and 1 represents opening;

the equilibrium constraint of the coalbed methane blending high-concentration gas is as follows:

in the method, in the process of the application,the volume of the mixed gas at the time t; />The high-concentration gas produced by the electric conversion gas at the moment t participates in the mixed gas flow; />The gas release flow of the underground gas storage at the moment t; />The air flow of the coal seam is extracted at the moment t; />Injecting gas flow into the gas turbine at the time t; />The gas concentration injected into the gas turbine at the time t; />The concentration of gas is produced for the electric conversion gas at the time t; />The gas concentration in the coal bed gas extracted at the time t;respectively, the minimum and the maximum gas concentrations required for ensuring the normal combustion power generation of the gas turbine.

2. The method for optimized dispatching of the mine integrated energy system of electric-to-gas blended coal bed gas according to claim 1, wherein the mine integrated energy system comprises the following components: the system comprises a fan power generation unit, a photovoltaic power generation unit, a power grid power supply unit, a coal bed gas utilization unit, a ventilation air utilization unit, a water inflow utilization unit, an electric conversion unit, a gas blending unit, a heat storage oxidation unit, a water source heat pump unit, a gas turbine unit, a waste heat boiler unit, an absorption refrigerator unit, an underground gas storage unit, a heat storage device unit, an electric load unit, a heat load unit and a cold load unit.

3. The method for optimized dispatching of mine integrated energy system of electric-to-gas blended coalbed methane of claim 1, wherein the mine integrated energy system parameters include: the method comprises the following steps of predicting values of electric load, heat load, cold load, fan output, photovoltaic output, coalbed methane, ventilation air methane and water burst, and initial values of system equipment composition, equipment operation parameters and current stored gas quantity of an underground gas storage.

4. The method for optimized scheduling of an electrical-to-gas blended coalbed methane mine integrated energy system of claim 3, wherein said plurality of operational constraints further comprises:

thermal storage oxidation device operation constraint, gas turbine operation constraint, electric power conversion operation constraint, water source heat pump operation constraint, absorption refrigerator operation constraint, waste heat boiler operation constraint, thermal storage device operation constraint and system power balance constraint.

5. The method for optimized scheduling of an electrical-to-gas blended coalbed methane mine comprehensive energy system of claim 1, wherein said solver is a GUROBI solver.

6. An optimized dispatching system for an electric-to-gas blended coal bed methane mine comprehensive energy system is characterized by comprising: the system comprises a mode module for mixing and utilizing different concentration gas, a mine comprehensive energy system optimizing and scheduling model module and a solving module;

the different-concentration gas mixing and utilizing mode module is used for mixing high-concentration gas converted by electric conversion gas absorption waste wind waste light and coal bed gas containing low-concentration gas, and simultaneously reforming an idle underground space of a mine into an underground gas storage to cooperate with electric conversion gas for gas mixing so as to form different-concentration gas mixing and utilizing modes of mutual coupling of electric conversion gas, coal bed gas and underground gas storage;

the mine comprehensive energy system optimizing and scheduling model module is used for establishing a mine comprehensive energy system optimizing and scheduling model of the electric-to-gas mixing coal bed gas according to mine comprehensive energy system parameters and different concentration gas mixing and utilizing modes;

the solving module is used for calling the solver to solve through the established mine comprehensive energy system optimization scheduling model; the solving result comprises the total running cost of the system, the abandoned wind and abandoned light rate, the running condition of the electric gas conversion and underground gas storage, the power balance condition of the system, and the gas concentration and flow change condition before and after blending;

the mixing and utilizing modes of the electric conversion gas, the coal bed gas and the underground gas storage are as follows:

in the method, in the process of the application,the total amount of high-concentration gas produced by electric conversion gas at the moment t; a is a conversion coefficient of converting electric conversion gas output gas power into gas volume; />The high-concentration gas produced by the electric conversion gas at the moment t participates in the mixed gas flow;the gas injection flow of the underground gas storage at the moment t; />The flow rate of the high-concentration gas mixed at the moment t;/>the gas release flow of the underground gas storage at the moment t; />The volume of the mixed gas at the time t; />The air flow of the coal seam is extracted at the moment t;

the mine comprehensive energy system optimization scheduling model of the electric conversion gas blending coal bed gas is as follows: the minimum running cost of the mine comprehensive energy system in a scheduling period is an objective function and a plurality of constraints; the minimum running cost in one scheduling period is an objective function:

minC＝C1+C2+C3+C4

in C, C ₁ 、C ₂ 、C ₃ 、C ₄ The system is respectively the total running cost, electricity purchasing cost, equipment operation and maintenance cost, wind and light discarding punishment cost and the initial capacity natural gas purchasing cost in the underground gas storage; t is the total time period number of 1 complete scheduling period;purchasing electric power for the system at the time t; />The electricity price at the time t; mu (mu) _PV 、μ _WT 、μ _GT 、μ _WHB 、μ _UGS 、μ _P2G 、μ _WSHP 、μ _RTO 、μ _AC 、μ _HSD The unit maintenance cost of the photovoltaic device, the fan, the gas turbine, the waste heat boiler, the underground gas storage, the electric conversion gas, the water source heat pump, the heat storage oxidation device, the absorption refrigerator and the heat storage device is respectively; />The output power of the photovoltaic, the fan, the gas turbine, the waste heat boiler, the electric conversion gas, the heat storage oxidation device and the absorption refrigerator at the moment t respectively; />The gas release and injection flow in the underground gas storage at the moment t are respectively; />The surge quantity at the moment t; />The heat storage power is stored and stored by the heat storage device at the moment t respectively; k (k) _PV 、k _WT Penalty coefficients for light and wind rejection are respectively; />Respectively obtaining predicted values of output power of the photovoltaic and the fan at the moment t; />Initial capacity for underground reservoirs; p is p _G Is the price of natural gas; the plurality of constraints includes: the operation constraint of the underground gas storage and the balance constraint of the coalbed methane blending high-concentration gas;

the operation constraint of the underground gas storage is as follows:

in the method, in the process of the application,the gas storage amounts in the underground gas storage at the time t and the time t-1 are respectively; />Respectively the gas injection flow and the release flow of the underground gas storage at the moment t; />The minimum and maximum injection flow of the underground gas storage are respectively; />The minimum and maximum release flow of the underground gas storage are respectively; />The variable is 0/1, which respectively represents the state of the underground gas storage in injecting and releasing gas at the moment t, 0 represents closing and 1 represents opening;

the equilibrium constraint of the coalbed methane blending high-concentration gas is as follows:

in the method, in the process of the application,the volume of the mixed gas at the time t; />The high-concentration gas produced by the electric conversion gas at the moment t participates in the mixed gas flow; />The gas release flow of the underground gas storage at the moment t; />The air flow of the coal seam is extracted at the moment t; />For injection combustion at time tGas flow in a gas turbine; />The gas concentration injected into the gas turbine at the time t; />The concentration of gas is produced for the electric conversion gas at the time t; />The gas concentration in the coal bed gas extracted at the time t;respectively, the minimum and the maximum gas concentrations required for ensuring the normal combustion power generation of the gas turbine.