Method and device for optimizing compressed air energy storage system with electric heating conduction oil for heat storage

Abstract

The invention relates to the technical field of energy storage, in particular to a method and a device for optimizing a compressed air energy storage system with heat stored by electric heating conduction oil. The method comprises the following steps: in an energy storage state, determining a first constraint condition of the energy storage state by utilizing a preset steady-state operation model of electric heating conduction oil coupled compressed air energy storage; and based on a first constraint condition, air is compressed to a high-pressure state to obtain high-pressure air, and the high-pressure air is stored in the air storage chamber after being subjected to heat exchange through the heat exchanger. In the energy release state, determining a second constraint condition of the energy storage state by utilizing a preset steady-state operation model of electric heating conduction oil coupled compressed air energy storage; and based on a second constraint condition, heating the heat-conducting oil to obtain high-temperature heat-conducting oil, and heating the high-pressure air by using the high-temperature heat-conducting oil to drive the expansion machine to generate power. Therefore, the problem that the inlet temperature of the expansion machine is limited by the outlet temperature of the compressor is solved in a manner of electrically heating the conduction oil and coupling the compressed air for energy storage, and efficient utilization of energy is realized.

Description

Technical Field

[0001] The present invention relates to the field of energy storage technology, and in particular to an optimization method and device for a compressed air energy storage system with electrically heated thermal oil for heat storage. Background Art

[0002] With the continuous expansion of the capacity of the national power grid, the peak-to-valley difference is increasing day by day. It is necessary to develop a new power system with renewable energy as the mainstream. Large-scale energy storage can effectively deal with the unstable power generation of intermittent renewable energy such as solar energy and wind energy, and is also a key technology to solve the volatility of renewable energy. Among them, compressed air energy storage, as a large-energy and high-efficiency energy storage technology, can store electric energy through compressed air by compressors during the low load period of the power grid; it can also release high-pressure gas in the air storage chamber during the high load period of the power grid, heat it through the combustion chamber or heat exchanger, and send it to the expander after it is raised to a certain temperature, converting the thermal potential energy of the compressed air into the mechanical work output of the expander to drive the generator to generate electricity.

[0003] Among the related technologies, the non-supplementary compressed air energy storage power generation system itself has the characteristics of zero pollution emission, environmental friendliness, and flexible operation, and is the mainstream direction of the development of compressed air energy storage power generation technology. The non-supplementary compressed air energy storage power generation system stores the heat generated during the compression process and heats and expands the high-pressure air to perform work during the expansion stage.

[0004] However, the inlet temperature of the expander is the most important factor affecting the system efficiency, which is generally determined by the outlet air temperature of the compressor. Considering factors such as the compressor material and the temperature resistance of the heat storage and exchange medium, it is difficult to achieve efficient energy utilization, which needs to be solved urgently. Summary of the invention

[0005] The present invention provides a method and device for optimizing a compressed air energy storage system with electrically heated thermal oil for heat storage, so as to solve the problem that the inlet temperature of the expander is limited by the outlet temperature of the compressor, thereby realizing efficient use of energy.

[0006] To achieve the above objectives, a first embodiment of the present invention provides a method for optimizing a compressed air energy storage system with electrically heated thermal oil for heat storage, comprising the following steps:

[0007] Get the current status of the compressed air energy storage system;

[0008] If the current state is an energy storage state, a first constraint condition of the energy storage state is determined using a preset steady-state operation model of electrically heated thermal oil coupled with compressed air energy storage;

[0009] Based on the first constraint, the air is compressed to a high-pressure state to obtain high-pressure air, and the high-pressure air is stored in an air storage chamber after heat exchange through a heat exchanger.

[0010] According to one embodiment of the present invention, after obtaining the current state of the compressed air energy storage system, the method further includes:

[0011] If the current state is an energy release state, the second constraint condition of the energy storage state is determined by using the preset steady-state operation model of electrically heated thermal oil coupled with compressed air energy storage;

[0012] Based on the second constraint, the heat transfer oil is heated to obtain high-temperature heat transfer oil, and the high-pressure air is heated by using the high-temperature heat transfer oil to drive the expander to generate electricity.

[0013] According to one embodiment of the present invention, the step of heating the high-pressure air with the high-temperature heat transfer oil to drive an expander to generate electricity includes:

[0014] Using the high-temperature heat transfer oil to heat the high-pressure air to obtain air that meets a preset temperature threshold;

[0015] The air that meets the preset temperature threshold is used to drive the expander to generate electricity.

[0016] According to an embodiment of the present invention, the first constraint condition includes:

[0017] At time t, the input power of the compressor is:

[0018]

[0019] Wherein, N is the number of stages of the compressor, is the air mass flow rate flowing into the compressor, c p is the constant pressure specific heat capacity of air, is the compressor inlet air temperature, is the compression ratio of the compressor, k is the adiabatic index of air, η c,j is the isentropic efficiency of the compressor, is the lower limit of the air mass flow rate flowing into the compressor, is the upper limit of the air mass flow rate flowing into the compressor, is a binary variable that controls the charging state.

[0020] According to an embodiment of the present invention, the second constraint condition further includes:

[0021] At time t, the output power of the expander is:

[0022]

[0023] Among them, η e,j is the isentropic efficiency of the expander, is the air mass flow rate flowing into the expander, is the inlet air temperature of the expander, is the lower limit of the air mass flow rate flowing into the expander, is the upper limit of the air mass flow rate flowing into the expander, is a binary variable that controls the discharge state.

[0024] According to the optimization method of the compressed air energy storage system with electrically heated thermal oil for heat storage proposed in the embodiment of the present invention, in the energy storage state, the first constraint condition of the energy storage state is determined by using the preset steady-state operation model of electrically heated thermal oil coupled with compressed air energy storage; based on the first constraint condition, the air is compressed to a high-pressure state to obtain high-pressure air, and the high-pressure air is stored in the air storage chamber after heat exchange through the heat exchanger. In the energy release state, the second constraint condition of the energy storage state is determined by using the preset steady-state operation model of electrically heated thermal oil coupled with compressed air energy storage; based on the second constraint condition, the thermal oil is heated to obtain high-temperature thermal oil, and the high-temperature thermal oil is used to heat the high-pressure air to drive the expander to generate electricity. Therefore, by coupling electrically heated thermal oil with compressed air energy storage, the problem of the expander inlet temperature being limited by the compressor outlet temperature is solved, and efficient energy utilization is achieved.

[0025] To achieve the above-mentioned purpose, the second embodiment of the present invention proposes a compressed air energy storage system optimization device for electrically heated thermal oil heat storage, comprising:

[0026] An acquisition module, used to obtain the current state of the compressed air energy storage system;

[0027] An acquisition module, used for determining a first constraint condition of the energy storage state by using a preset steady-state operation model of electrically heated thermal oil coupled with compressed air energy storage when the current state is an energy storage state;

[0028] The processing module is used to compress the air to a high-pressure state to obtain high-pressure air based on the first constraint condition, and store the high-pressure air in an air storage chamber after heat exchange through a heat exchanger.

[0029] According to one embodiment of the present invention, after acquiring the current state of the compressed air energy storage system, the acquisition module further includes:

[0030] an obtaining unit, configured to determine, when the current state is an energy release state, a second constraint condition of the energy storage state by using the preset steady-state operation model of electrically heated thermal oil coupled with compressed air energy storage;

[0031] The processing unit is used to heat the heat transfer oil to obtain high-temperature heat transfer oil based on the second constraint condition, and use the high-temperature heat transfer oil to heat the high-pressure air to drive the expander to generate electricity.

[0032] According to an embodiment of the present invention, the processing unit is specifically used to:

[0033] Using the high-temperature heat transfer oil to heat the high-pressure air to obtain air that meets a preset temperature threshold;

[0034] The air that meets the preset temperature threshold is used to drive the expander to generate electricity.

[0035] According to an embodiment of the present invention, the first constraint condition includes:

[0036] At time t, the input power of the compressor is:

[0037]

[0038] Wherein, N is the number of stages of the compressor, is the air mass flow rate flowing into the compressor, c p is the constant pressure specific heat capacity of air, is the compressor inlet air temperature, is the compression ratio of the compressor, k is the adiabatic index of air, η c,j is the isentropic efficiency of the compressor, is the lower limit of the air mass flow rate flowing into the compressor, is the upper limit of the air mass flow rate flowing into the compressor, is a binary variable that controls the charging state.

[0039] According to an embodiment of the present invention, the second constraint condition further includes:

[0040] At time t, the output power of the expander is:

[0041]

[0042] Among them, η e,j is the isentropic efficiency of the expander, is the air mass flow rate flowing into the expander, is the inlet air temperature of the expander, is the lower limit of the air mass flow rate flowing into the expander, is the upper limit of the air mass flow rate flowing into the expander, is a binary variable that controls the discharge state.

[0043] According to the compressed air energy storage system optimization device with electrically heated thermal oil and heat storage proposed in the embodiment of the present invention, in the energy storage state, the first constraint condition of the energy storage state is determined by using the preset steady-state operation model of electrically heated thermal oil coupled with compressed air energy storage; based on the first constraint condition, the air is compressed to a high-pressure state to obtain high-pressure air, and the high-pressure air is stored in the air storage chamber after heat exchange through the heat exchanger. In the energy release state, the second constraint condition of the energy storage state is determined by using the preset steady-state operation model of electrically heated thermal oil coupled with compressed air energy storage; based on the second constraint condition, the thermal oil is heated to obtain high-temperature thermal oil, and the high-temperature thermal oil is used to heat the high-pressure air to drive the expander to generate electricity. Therefore, by coupling electrically heated thermal oil with compressed air energy storage, the problem of the expander inlet temperature being limited by the compressor outlet temperature is solved, and efficient energy utilization is achieved.

[0044] To achieve the above-mentioned purpose, the third aspect of the present invention proposes an electronic device, comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the method for optimizing a compressed air energy storage system with electrically heated thermal oil for heat storage as described in the above-mentioned embodiment.

[0045] To achieve the above objectives, the fourth aspect of the present invention proposes a computer-readable storage medium having a computer program stored thereon, which is executed by a processor to implement the method for optimizing a compressed air energy storage system with electrically heated thermal oil for heat storage as described in the above embodiments.

[0046] To achieve the above objectives, a fifth aspect of the present invention proposes a computer program product, including a computer program, which, when executed by a processor, is used to implement the optimization method of a compressed air energy storage system with electrically heated thermal oil for heat storage as described in the above embodiments.

[0047] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0049] Figure 1 A flowchart of a method for optimizing a compressed air energy storage system with electrically heated thermal oil for heat storage according to an embodiment of the present invention;

[0050] Figure 2 A schematic diagram of the structure of a compressed air energy storage system optimization device for electrically heated thermal oil heat storage according to an embodiment of the present invention;

[0051] Figure 3 A block diagram of a compressed air energy storage system optimization device for electrically heated thermal oil heat storage according to an embodiment of the present invention;

[0052] Figure 4 It is a schematic diagram of the structure of an electronic device provided according to an embodiment of the present invention. DETAILED DESCRIPTION

[0053] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0054] The following describes, with reference to the accompanying drawings, a method and device for optimizing a compressed air energy storage system using electrically heated thermal oil to store heat according to an embodiment of the present invention.

[0055] Figure 1 It is a flow chart of a method for optimizing a compressed air energy storage system with electrically heated thermal oil heat storage according to an embodiment of the present invention.

[0056] Before introducing the method for optimizing a compressed air energy storage system with electrically heated thermal oil and heat storage proposed in an embodiment of the present invention, the following first introduces an optimization device for a compressed air energy storage system with electrically heated thermal oil and heat storage (hereinafter referred to as the compressed air energy storage system) involved in the method.

[0057] like Figure 2 As shown, the compressed air energy storage system optimization device for electrically heated thermal oil heat storage includes: an air compression subsystem, an electric motor, a heat storage and heat exchange subsystem (such as Figure 2 heat exchangers H1 to H4 shown), hot water heat exchanger, absorption refrigeration unit, air storage chamber, expansion subsystem (such as Figure 2 The air compression subsystem may include a first-stage compressor (such as T1 and T2 shown in FIG. Figure 2 C1) and a secondary compressor (such as Figure 2 As shown in C2), the inlet of the first-stage compressor is in direct contact with the atmosphere, and the air can be compressed by driving the air compression subsystem through the electric motor; the heat storage and heat exchange subsystem stores cooling water, which can absorb the heat of the compressed air; the electric heating thermal oil subsystem includes a thermal oil heater, a high-temperature thermal oil storage tank and a low-temperature thermal oil storage tank. The thermal oil heater can be used to heat the thermal oil, and the heated high-temperature thermal oil can be stored in the high-temperature thermal oil storage tank. The high-temperature thermal oil is heat exchanged by the heat exchanger to obtain low-temperature thermal oil, which can be stored in the low-temperature thermal oil storage tank.

[0058] For example, Figure 1As shown, the method for optimizing the compressed air energy storage system with electrically heated thermal oil heat storage comprises the following steps:

[0059] In step S101, the current state of the compressed air energy storage system is obtained.

[0060] Among them, the current state of the compressed air energy storage system may include an energy storage state and an energy release state. Different control strategies may be executed according to the current state of the compressed air energy storage system.

[0061] For ease of understanding, the control strategies when the current state of the compressed air energy storage system is the energy storage state and the energy release state are respectively described in detail below.

[0062] In step S102, if the current state is the energy storage state, the first constraint condition of the energy storage state is determined using a preset steady-state operation model of electrically heated thermal oil coupled with compressed air energy storage.

[0063] That is to say, taking the maximum benefit of the compressed air energy storage system as the objective function, the heat of the thermal oil heater as the additional operating cost, and the preset steady-state operation model of the electrically heated thermal oil coupled to the compressed air energy storage as the constraint condition, the system benefit can be optimized. Therefore, when the current state is the energy storage state, in order to optimize the system benefit, the preset steady-state operation model of the electrically heated thermal oil coupled to the compressed air energy storage can be used to determine the first constraint condition of the energy storage state.

[0064] It is understandable that the air compression subsystem can adjust the compressor outlet temperature according to the user's heat and cooling load requirements by adjusting parameters such as the air mass flow rate flowing into the inlet of each level of compressor, the compressor pressure ratio, etc.

[0065] In some embodiments, the first constraint condition includes:

[0066] At time t, the input power of the compressor is:

[0067]

[0068] Where N is the number of compressor stages, is the air mass flow rate flowing into the compressor, c p is the constant pressure specific heat capacity of air, is the compressor inlet air temperature, is the compression ratio of the compressor, k is the adiabatic index of the air, η c,j is the isentropic efficiency of the compressor, is the lower limit of the air mass flow rate flowing into the compressor, is the upper limit of the air mass flow rate flowing into the compressor, is a binary variable that controls the charging state.

[0069] In step S103, based on the first constraint condition, the air is compressed to a high-pressure state to obtain high-pressure air, and the high-pressure air is stored in an air storage chamber after heat exchange through a heat exchanger.

[0070] Specifically, after determining the first constraint, based on the first constraint, low-quality electricity such as off-peak electricity, low-quality wind power, and low-quality photovoltaic power can be used to drive the electric motor, and the air is compressed to a high-pressure state by driving the multi-stage compressor through the motor to obtain high-pressure air. The high-pressure air at the outlet of the last stage of the compressor absorbs heat through the heat exchange medium (i.e., cooling water) in the heat exchanger and is stored in the air storage chamber. The heat exchange medium after absorbing heat forms high-temperature water, which enters the hot water heat exchanger and the absorption refrigeration unit respectively to provide heat for them.

[0071] It is understandable that when the power demand is low or the wind power or photovoltaic power generation conditions are poor, the generated electric energy may be of low quality (such as unstable voltage, insufficient power, etc.), and such electric energy is not easy to be directly incorporated into the power grid or used, which is easy to cause waste. The embodiments of the present invention utilize low-quality electric energy such as valley electricity, low-quality wind power, and low-quality photovoltaic power, and convert it into high-quality thermal energy and finally into electric energy, which can not only improve energy utilization efficiency, but also reduce energy waste and environmental pollution.

[0072] For example, if Figure 2 As shown, the motor first drives the first-stage compressor to compress the air. The air compressed by the first-stage compressor absorbs heat through the heat exchanger and then enters the second-stage compressor for re-compression. The air compressed by the second-stage compressor absorbs heat through the heat exchanger and then enters the air storage chamber for storage. Among them, the heat exchange medium after absorbing heat from the air compressed by the first-stage compressor enters the hot water heat exchanger in the form of high-temperature water for hot water supply, thereby realizing heat energy recovery and reuse. The heat exchange medium after absorbing heat from the air compressed by the second-stage compressor enters the absorption refrigeration unit in the form of high-temperature water. The high-temperature water is transferred to the absorbent (such as lithium bromide) of the absorption refrigeration unit, so that the temperature of the absorbent increases, thereby promoting the desorption of the refrigerant (such as water) of the absorption refrigeration unit from the absorbent, forming low-temperature and low-pressure refrigerant vapor, thereby realizing the refrigeration cycle.

[0073] It should be noted that the air compression subsystem can decide whether to start the second (third, fourth) stage compressor for air compression according to the input energy situation, and finally the air enters the air storage reservoir for storage. The number of compressors included in the air compression subsystem can be set according to actual conditions, and no specific limitation is made here.

[0074] Next, the control strategy in the energy release state is introduced.

[0075] As a possible implementation method, in some embodiments, after obtaining the current state of the compressed air energy storage system, it also includes: if the current state is an energy release state, using a preset steady-state operation model of electrically heated thermal oil coupled to compressed air energy storage to determine a second constraint condition for the energy storage state; based on the second constraint condition, heating the thermal oil to obtain high-temperature thermal oil, and using the high-temperature thermal oil to heat the high-pressure air to drive the expander to generate electricity.

[0076] Among them, thermal transfer oil has a wide operating temperature range and is regarded as a high-quality heat storage medium due to its high energy storage density, long service life, good thermal stability and low cost. It can be widely used in chemical, metallurgical, nuclear and thermal power industries.

[0077] Specifically, when the current state is the energy release state, the system's benefits are also considered to be optimal, and the preset steady-state operation model of electrically heated thermal oil coupled with compressed air energy storage can be used to determine the second constraint of the energy storage state. After determining the second constraint, based on the second constraint, low-quality electricity such as valley electricity, low-quality wind power, and low-quality photovoltaic power can also be used to heat the thermal oil to obtain high-temperature thermal oil, that is, to convert low-quality electricity into high-quality thermal energy, which can further heat the air from the outlet of the air storage chamber, thereby driving the turbo expander to generate electricity, solving the problem that the expander inlet temperature is limited by the compressor outlet temperature, and realizing efficient energy utilization.

[0078] As a possible implementation method, in some embodiments, high-temperature heat transfer oil is used to heat high-pressure air to drive an expander to generate electricity, including: using high-temperature heat transfer oil to heat high-pressure air to obtain air that meets a preset temperature threshold; using air that meets the preset temperature threshold to drive an expander to generate electricity.

[0079] For example, if Figure 2 As shown, by driving the thermal oil heater to heat the thermal oil with low-quality electricity such as off-peak electricity, low-quality wind power, and low-quality photovoltaic power, the low-quality electricity can be converted into high-quality thermal energy and stored in a high-temperature thermal oil storage tank. The thermal oil, as a heat carrier, can effectively absorb and store this thermal energy. The air after pressure reduction and the heat from the high-temperature thermal oil tank exchange heat in the heat exchanger, so that the air temperature entering the expander reaches a preset temperature threshold (the preset temperature threshold can be determined based on the operating efficiency and performance requirements of the expander, and is not specifically limited here), thereby further promoting the expander to work and generate electricity. Finally, the exhaust gas at the outlet of the terminal expander can be discharged into the air, and the low-temperature thermal oil after heat exchange is stored in the low-temperature thermal oil storage tank.

[0080] It is understandable that this process can achieve different temperatures of heat transfer oil by changing the heating time of the electrically heated heat transfer oil, and then achieve different expander inlet air temperatures, so as to facilitate more flexible application in different scenarios.

[0081] In some embodiments, the second constraint further includes:

[0082] At time t, the output power of the expander is:

[0083]

[0084] Among them, η e,j is the isentropic efficiency of the expander, is the air mass flow rate flowing into the expander, is the inlet air temperature of the expander, is the lower limit of the air mass flow rate flowing into the expander, is the upper limit of the air mass flow rate flowing into the expander, is a binary variable that controls the discharge state.

[0085] In addition, by analyzing the conversion and storage relationship between various energies within the system, the thermodynamic model between the components of the compressed air energy storage system is listed, that is, the constraints of the preset steady-state operation model of electric heating thermal oil coupled compressed air energy storage also include:

[0086] The volume and temperature of the air storage chamber can be considered to be in a constant state. At the same time, the air storage pressure and mass follow the ideal gas state equation. Therefore, the pressure of the air storage chamber is determined by the mass flow rate of air flowing in and out, and then:

[0087]

[0088] Among them, R g is the air gas constant, T b is the temperature of the air storage chamber, pr b,l is the lower limit of air pressure in the air storage chamber, pr b,u V is the upper limit of the air pressure in the air storage chamber, st is the volume of the air storage chamber.

[0089] The mass flow rate of high-temperature heat transfer fluid required for air expansion heating should meet the following requirements:

[0090]

[0091] in, The mass flow rate of the high-temperature heat transfer fluid required to heat the air expansion, c F is the specific heat capacity of the heat transfer fluid.

[0092] The thermal oil heater and heat pump are the main sources of high-temperature and low-temperature heat transfer fluids, respectively. The mass flow rates of the heat transfer fluids generated meet the following requirements:

[0093]

[0094] in, is the mass flow rate of the heat transfer fluid generated by the thermal oil heater, is the electrical power input to the thermal oil heater, is the lower limit of the input power of the thermal oil heater. The upper limit of the input power of the thermal oil heater. is the mass flow rate of the heat transfer fluid generated by the heat pump, is the electrical power input to the heat pump, is the lower limit of the heat pump input power, Upper limit for electrical input to the heat pump.

[0095] Furthermore, in terms of economic benefits, the system design mainly focuses on construction and operation and maintenance cost accounting and profit calculation according to the internal structure and the type of energy market involved. In terms of cost accounting, the total investment cost of the system includes static investment cost and total operation and maintenance cost. The annual operation and maintenance cost mainly includes the annual equipment repair cost, labor cost and material component replacement cost.

[0096] Therefore, the total operation and maintenance cost of the system is equal to the sum of the annual operation costs during the service life:

[0097] V B =C B,tin ·N life ;

[0098]

[0099] Among them, N life is the useful life, C S is the static investment cost, 95% of the static investment cost is converted into fixed assets, and the repair cost is 0.01 of the total value of the fixed assets. lab is the annual labor cost and material component replacement cost, C rep The cost of replacing material parts per unit power scale, is the power scale of the system.

[0100] The additional operating cost parameters of thermal oil heaters and heat pumps should meet the following requirements:

[0101] C EX =β hr ·λ·P M ;

[0102] Among them, β hr is the electric heat exchange coefficient, λ is the unit price of electricity, P M For electricity purchase.

[0103] Finally, the objective function (i.e. the maximum benefit of the compressed air energy storage system) is:

[0104] maxf=c d P d -C B -C EX ;

[0105] Among them, c d is the unit price of electricity, P d For selling electricity.

[0106] Therefore, taking the maximum benefit of the compressed air energy storage system as the objective function, we can further find the optimal power purchase amount and the inlet air temperature of the expander, so as to achieve the best system benefit.

[0107] According to the optimization method of the compressed air energy storage system with electrically heated thermal oil for heat storage proposed in the embodiment of the present invention, in the energy storage state, the first constraint condition of the energy storage state is determined by using the preset steady-state operation model of electrically heated thermal oil coupled with compressed air energy storage; based on the first constraint condition, the air is compressed to a high-pressure state to obtain high-pressure air, and the high-pressure air is stored in the air storage chamber after heat exchange through the heat exchanger. In the energy release state, the second constraint condition of the energy storage state is determined by using the preset steady-state operation model of electrically heated thermal oil coupled with compressed air energy storage; based on the second constraint condition, the thermal oil is heated to obtain high-temperature thermal oil, and the high-temperature thermal oil is used to heat the high-pressure air to drive the expander to generate electricity. Therefore, by coupling electrically heated thermal oil with compressed air energy storage, the problem of the expander inlet temperature being limited by the compressor outlet temperature is solved, and efficient energy utilization is achieved.

[0108] Next, the compressed air energy storage system optimization device with electrically heated thermal oil heat storage according to an embodiment of the present invention is described with reference to the accompanying drawings.

[0109] Figure 3 It is a block diagram of a compressed air energy storage system optimization device for electrically heated thermal oil heat storage according to an embodiment of the present invention.

[0110] like Figure 3 As shown, the compressed air energy storage system optimization device 10 for electrically heated thermal oil heat storage includes: an acquisition module 100, an acquisition module 200 and a processing module 300.

[0111] Wherein, the acquisition module 100 is used to obtain the current state of the compressed air energy storage system;

[0112] An acquisition module 200 is used to determine a first constraint condition of the energy storage state by using a preset steady-state operation model of electrically heated thermal oil coupled compressed air energy storage when the current state is the energy storage state;

[0113] The processing module 300 is used to compress the air to a high-pressure state to obtain high-pressure air based on the first constraint condition, and store the high-pressure air in an air storage chamber after heat exchange through a heat exchanger.

[0114] Furthermore, in some embodiments, after obtaining the current state of the compressed air energy storage system, the obtaining module 100 further includes:

[0115] An obtaining unit, used for determining a second constraint condition of the energy storage state by using a preset steady-state operation model of electrically heated thermal oil coupled with compressed air energy storage when the current state is an energy release state;

[0116] The processing unit is used to heat the heat transfer oil to obtain high-temperature heat transfer oil based on the second constraint condition, and use the high-temperature heat transfer oil to heat the high-pressure air to drive the expander to generate electricity.

[0117] Furthermore, in some embodiments, the processing unit is specifically configured to:

[0118] Use high-temperature heat transfer oil to heat high-pressure air to obtain air that meets the preset temperature threshold;

[0119] Air that meets a preset temperature threshold is used to drive an expander to generate electricity.

[0120] Furthermore, in some embodiments, the first constraint condition includes:

[0121] At time t, the input power of the compressor is:

[0122]

[0123] Where N is the number of compressor stages, is the air mass flow rate flowing into the compressor, c p is the constant pressure specific heat capacity of air, is the compressor inlet air temperature, is the compression ratio of the compressor, k is the adiabatic index of the air, η c,j is the isentropic efficiency of the compressor, is the lower limit of the air mass flow rate flowing into the compressor, is the upper limit of the air mass flow rate flowing into the compressor, is a binary variable that controls the charging state.

[0124] Furthermore, in some embodiments, the second constraint condition further includes:

[0125] At time t, the output power of the expander is:

[0126]

[0127] Among them, η e,j is the isentropic efficiency of the expander, is the air mass flow rate flowing into the expander, is the inlet air temperature of the expander, is the lower limit of the air mass flow rate flowing into the expander, is the upper limit of the air mass flow rate flowing into the expander, is a binary variable that controls the discharge state.

[0128] It should be noted that the aforementioned explanation of the embodiment of the method for optimizing the compressed air energy storage system with electrically heated thermal oil for heat storage is also applicable to the device for optimizing the compressed air energy storage system with electrically heated thermal oil for heat storage in this embodiment, and will not be repeated here.

[0129] According to the compressed air energy storage system optimization device with electrically heated thermal oil and heat storage proposed in the embodiment of the present invention, in the energy storage state, the first constraint condition of the energy storage state is determined by using the preset steady-state operation model of electrically heated thermal oil coupled with compressed air energy storage; based on the first constraint condition, the air is compressed to a high-pressure state to obtain high-pressure air, and the high-pressure air is stored in the air storage chamber after heat exchange through the heat exchanger. In the energy release state, the second constraint condition of the energy storage state is determined by using the preset steady-state operation model of electrically heated thermal oil coupled with compressed air energy storage; based on the second constraint condition, the thermal oil is heated to obtain high-temperature thermal oil, and the high-temperature thermal oil is used to heat the high-pressure air to drive the expander to generate electricity. Therefore, by coupling electrically heated thermal oil with compressed air energy storage, the problem of the expander inlet temperature being limited by the compressor outlet temperature is solved, and efficient energy utilization is achieved.

[0130] Figure 4 A schematic diagram of the structure of an electronic device provided by an embodiment of the present invention. The electronic device may include:

[0131] Memory 401 , processor 402 , and a computer program stored in the memory 401 and executable on the processor 402 .

[0132] When the processor 402 executes the program, the optimization method of the compressed air energy storage system with electrically heated thermal oil for heat storage provided in the above-mentioned embodiment is implemented.

[0133] Furthermore, the electronic device further comprises:

[0134] The communication interface 403 is used for communication between the memory 401 and the processor 402 .

[0135] The memory 401 is used to store computer programs that can be executed on the processor 402 .

[0136] The memory 401 may include a high-speed RAM (Random Access Memory) memory, and may also include a non-volatile memory, such as at least one disk memory.

[0137] If the memory 401, the processor 402 and the communication interface 403 are implemented independently, the communication interface 403, the memory 401 and the processor 402 can be connected to each other through a bus and communicate with each other. The bus can be an ISA (Industry Standard Architecture) bus, a PCI (Peripheral Component Interconnect) bus or an EISA (Extended Industry Standard Architecture) bus, etc. The bus can be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Figure 4 Only one thick line is used in the diagram, but this does not mean that there is only one bus or only one type of bus.

[0138] Optionally, in a specific implementation, if the memory 401, the processor 402 and the communication interface 403 are integrated on a chip, the memory 401, the processor 402 and the communication interface 403 can communicate with each other through an internal interface.

[0139] The processor 402 may be a CPU (Central Processing Unit), or an ASIC (Application Specific Integrated Circuit), or one or more integrated circuits configured to implement the embodiments of the present invention.

[0140] An embodiment of the present invention further provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the above-mentioned method for optimizing a compressed air energy storage system with electrically heated thermal oil for heat storage.

[0141] An embodiment of the present invention further provides a computer program product, including a computer program, which, when executed by a processor, implements the above-mentioned method for optimizing a compressed air energy storage system with electrically heated thermal oil for heat storage.

[0142] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0143] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms are not necessarily directed to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0144] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A method for optimizing a compressed air energy storage system with electrically heated thermal oil for heat storage, characterized in that: The following steps are involved: Get the current status of the compressed air energy storage system; If the current state is an energy storage state, a first constraint condition of the energy storage state is determined using a preset steady-state operation model of electrically heated thermal oil coupled with compressed air energy storage; Based on the first constraint, the air is compressed to a high-pressure state to obtain high-pressure air, and the high-pressure air is stored in an air storage chamber after heat exchange through a heat exchanger.

2. The method for optimizing the compressed air energy storage system with electrically heated thermal oil heat storage according to claim 1, characterized in that: After obtaining the current state of the compressed air energy storage system, the method further includes: If the current state is an energy release state, the second constraint condition of the energy storage state is determined by using the preset steady-state operation model of electrically heated thermal oil coupled with compressed air energy storage; Based on the second constraint, the heat transfer oil is heated to obtain high-temperature heat transfer oil, and the high-pressure air is heated by using the high-temperature heat transfer oil to drive the expander to generate electricity.

3. The method for optimizing the compressed air energy storage system with electrically heated thermal oil heat storage according to claim 2, characterized in that: The step of utilizing the high-temperature heat-conducting oil to heat the high-pressure air to drive an expander to generate electricity includes: Using the high-temperature heat transfer oil to heat the high-pressure air to obtain air that meets a preset temperature threshold; The air that meets the preset temperature threshold is used to drive the expander to generate electricity.

4. The method for optimizing the compressed air energy storage system with electrically heated thermal oil heat storage according to claim 1, characterized in that: The first constraint condition includes: At time t, the input power of the compressor is: Wherein, N is the number of stages of the compressor, is the air mass flow rate flowing into the compressor, c p is the constant pressure specific heat capacity of air, is the compressor inlet air temperature, is the compression ratio of the compressor, k is the adiabatic index of air, η c,j is the isentropic efficiency of the compressor, is the lower limit of the air mass flow rate flowing into the compressor, is the upper limit of the air mass flow rate flowing into the compressor, is a binary variable that controls the charging state.

5. The method for optimizing the compressed air energy storage system with electrically heated thermal oil heat storage according to claim 2, characterized in that: The second constraint condition also includes: At time t, the output power of the expander is: Among them, η e,j is the isentropic efficiency of the expander, is the air mass flow rate flowing into the expander, is the inlet air temperature of the expander, is the lower limit of the air mass flow rate flowing into the expander, is the upper limit of the air mass flow rate flowing into the expander, is a binary variable that controls the discharge state.

6. An optimization device for compressed air energy storage system with electrically heated thermal oil heat storage, characterized in that: include: An acquisition module, used to obtain the current state of the compressed air energy storage system; An acquisition module, used for determining a first constraint condition of the energy storage state by using a preset steady-state operation model of electrically heated thermal oil coupled with compressed air energy storage when the current state is an energy storage state; The processing module is used to compress the air to a high-pressure state to obtain high-pressure air based on the first constraint condition, and store the high-pressure air in an air storage chamber after heat exchange through a heat exchanger.

7. The device for optimizing compressed air energy storage system with electrically heated thermal oil heat storage according to claim 6 is characterized in that: After obtaining the current state of the compressed air energy storage system, the obtaining module further includes: an obtaining unit, configured to determine, when the current state is an energy release state, a second constraint condition of the energy storage state by using the preset steady-state operation model of electrically heated thermal oil coupled with compressed air energy storage; The processing unit is used to heat the heat transfer oil to obtain high-temperature heat transfer oil based on the second constraint condition, and use the high-temperature heat transfer oil to heat the high-pressure air to drive the expander to generate electricity.

8. An electronic device, characterized in that: include: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the method for optimizing a compressed air energy storage system with electrically heated thermal oil for heat storage as described in any one of claims 1 to 5.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: The program is executed by a processor to implement the method for optimizing a compressed air energy storage system with electrically heated thermal oil for heat storage as described in any one of claims 1 to 5.

10. A computer program product, characterized in that It includes a computer program, which, when executed by a processor, is used to implement the optimization method of a compressed air energy storage system with electrically heated thermal oil heat storage as described in any one of claims 1 to 5.

Images