CN116658264A - Compressed air energy storage system with expansion power generation systems connected in parallel - Google Patents

Compressed air energy storage system with expansion power generation systems connected in parallel Download PDF

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Publication number
CN116658264A
CN116658264A CN202310661267.4A CN202310661267A CN116658264A CN 116658264 A CN116658264 A CN 116658264A CN 202310661267 A CN202310661267 A CN 202310661267A CN 116658264 A CN116658264 A CN 116658264A
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China
Prior art keywords
power generation
generation system
expansion power
heat exchanger
expansion
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CN202310661267.4A
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Chinese (zh)
Inventor
张甜甜
刘海波
陶铁铃
何杰
陈冲
张旭
汪盛波
李胜
金乾
张顺
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Changjiang Institute of Survey Planning Design and Research Co Ltd
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Changjiang Institute of Survey Planning Design and Research Co Ltd
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Priority to CN202310661267.4A priority Critical patent/CN116658264A/en
Publication of CN116658264A publication Critical patent/CN116658264A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
    • F01K7/02—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being of multiple-expansion type
    • F01K7/04—Control means specially adapted therefor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
    • F01D15/10—Adaptations for driving, or combinations with, electric generators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B41/00—Pumping installations or systems specially adapted for elastic fluids
    • F04B41/02—Pumping installations or systems specially adapted for elastic fluids having reservoirs
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/16—Mechanical energy storage, e.g. flywheels or pressurised fluids

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Abstract

The invention relates to the technical field of electric power energy storage, in particular to a compressed air energy storage system with expansion power generation systems connected in parallel. Comprises a compression system, a compressed air storage unit, an expansion power generation unit and a cold and hot storage unit. The compressed air storage unit comprises a plurality of air storage devices connected in parallel. The expansion power generation unit comprises a plurality of expansion power generation systems which are connected in parallel and have different rated power. A plurality of different expansion power generation systems are connected to each of the parallel high pressure gas storage devices. The cold and hot storage unit comprises a heat storage device and a cold storage device, the input end of the compression system is connected with surplus electric energy, the compression system outputs high-pressure gas, the high-pressure gas is cooled by a heat exchange medium stored by the cold storage device and then is input into the compressed air storage unit, and the compressed air storage unit outputs the high-pressure gas, and the high-pressure gas is heated by the heat exchange medium stored by the heat storage device and then is input into an expander of the expansion power generation system. The system can realize various power generation combination modes, has wider operation interval and higher compressed air utilization rate and energy storage efficiency.

Description

Compressed air energy storage system with expansion power generation systems connected in parallel
Technical Field
The invention relates to the technical field of electric power energy storage, in particular to a compressed air energy storage system with expansion power generation systems connected in parallel.
Background
The energy storage has energy space-time conversion capability, so that the energy storage becomes an effective way for solving the problem of new energy grid-connected digestion at present. In recent years, a compressed air energy storage system is paid attention to, and when energy is stored, air under standard atmospheric pressure is compressed to a high-pressure state through a multistage compressor cascade, and the air is stored in an air storage device, and when energy is released, the high-pressure air drives a cascade multistage expander to do work. The whole set of compressed air energy storage system has specific rated power, and the corresponding compressor, expander series and high-pressure gas pressure interval are arranged in a matching mode.
On the one hand, after the whole gas expansion process is finished, the gas pressure in the high-pressure gas storage chamber is still higher and is not fully utilized, and researches show that the increase of the pressure interval of the gas storage device is favorable for improving the energy storage efficiency of the energy storage device, so that the compressed gas utilization rate of the gas storage device is necessary to be further improved. On the other hand, as the main equipment participating in peak regulation and frequency modulation of the power grid, the output of the energy storage system can change greatly along with the running state change of the power system, when the output of the energy storage system deviates from the rated power generation, the power generation efficiency of the energy storage system is reduced, and therefore, the running interval of the power generation power of the system is required to be further improved to adapt to the inherent characteristic of high fluctuation of the output of the new energy.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a compressed air energy storage system with an expansion power generation system connected in parallel, which can realize various power generation combination modes, has wider operation interval and higher compressed air utilization rate and energy storage efficiency.
The invention provides a compressed air energy storage system with parallel expansion power generation systems, which comprises a compression system, a compressed air storage unit, an expansion power generation unit and a cold and hot storage unit, wherein the compressed air storage unit comprises a plurality of air storage devices connected in parallel, the expansion power generation unit comprises a plurality of expansion power generation systems connected in parallel, the expansion power generation systems are respectively matched with different high-pressure gas pressure intervals and have different operation power intervals, the number of the air storage devices is not lower than that of the expansion power generation systems, the cold and hot storage unit comprises a heat storage device and a cold storage device, the input end of the compression system is connected with new energy sources such as wind power and photovoltaic power, the input end of the compression system is connected with a power grid, the compressed air storage unit outputs high-pressure gas after being cooled by the cold storage device, and the compressed air storage unit outputs the high-pressure gas after being heated by the heat storage device and is input to an expander of the expansion power generation system. The inlet and exhaust temperature of each stage of compressor and expander is controlled by adjusting the flow of heat exchange medium of the heat exchanger.
Preferably, each gas storage device in the compressed air storage unit is connected to each expansion power generation system at the same time.
Preferably, the gas storage device is in control communication with the expansion power generation system through a switch valve.
Preferably, the air flow rate between the air storage device and the expansion power generation system is controlled through a throttle valve.
More preferably, the compression system comprises a motor, a first-stage compressor, a second-stage compressor, …, an Mth-stage compressor, a first heat exchanger, a second heat exchanger, … and an Mth-stage heat exchanger, wherein the motor, the first-stage compressor, the second-stage compressor, … and the Mth-stage compressor are sequentially connected in series;
the gas outlet of the ith stage compressor is connected to the high-temperature gas inlet side of the ith stage heat exchanger, the high-temperature gas is cooled by the heat exchanger, the low-temperature gas outlet side of the ith stage heat exchanger is connected to the inlet of the (i+1) th stage compressor, the gas outlet of the Mth stage compressor is connected to the high-temperature gas inlet side of the Mth stage heat exchanger, and the low-temperature gas outlet side of the Mth stage heat exchanger is connected to the compressed air storage unit after the high-temperature gas is cooled by the heat exchanger;
the cold storage device is respectively connected with the low-temperature heat exchange medium inlet sides of the first heat exchanger, the second heat exchanger, the … and the M-th stage heat exchanger of the compression system, and the low-temperature heat exchange medium is connected to the heat storage device through the high-temperature heat exchange medium outlet side of the heat exchanger after heat exchange of the heat exchanger, wherein i=1, 2, … and M-1.
Preferably, the expansion power generation unit comprises a first expansion power generation system, a second expansion power generation system, … and an Nth expansion power generation system, wherein the rated power of the jth expansion power generation system is P Nj Rated power of the j+1 expansion power generation system is P N(j+1) And P is N(j+1) <P Nj ，j＝1，2，…，N-1。
More preferably, the second expansion power generation system comprises a first stage heat exchanger of the second expansion power generation system, a first stage expander of the second expansion power generation system, … …, an L-th stage heat exchanger of the second expansion power generation system, an L-th stage expander of the second expansion power generation system and a second generator which are sequentially connected.
More preferably, the first expansion power generation system comprises a first stage heat exchanger of the first expansion power generation system, a first stage expander of the first expansion power generation system, a second stage heat exchanger of the first expansion power generation system, a second stage expander of the first expansion power generation system, … …, a P-th stage heat exchanger of the first expansion power generation system, a P-th stage expander of the first expansion power generation system and a first generator which are sequentially connected.
Preferably, the front parts of the expansion machines of each stage of the expansion power generation system are respectively provided with a heat exchanger, the output end of the compressed air storage unit is connected to the low-temperature gas inlet side of the heat exchanger before the expansion machine, and the low-temperature gas is heated by the heat exchanger and then is connected to the inlet of the expansion machine through the high-temperature gas outlet side of the heat exchanger.
The heat storage device is respectively connected with the inlet side of a high-temperature heat exchange medium of the expansion power generation unit heat exchanger, and the high-temperature heat exchange medium is connected to the cold storage device through the outlet side of a low-temperature heat exchange medium of the heat exchanger after heat exchange of the heat exchanger.
Preferably, the generators in the expansion power generation unit are all direct-drive motors.
The beneficial effects of the invention are as follows:
1. the system consists of a parallel gas storage device and parallel expansion power generation units matched with different high-pressure gas pressure intervals, wherein the parallel expansion power generation units have different rated powers, can realize various power generation combination modes, and have wider operation intervals, higher compressed air utilization rate and energy storage efficiency.
2. According to different system power demands, the expansion power generation system with the rated power being closer is matched, so that the demand of new energy sources on energy storage output can be better fitted, the expansion power generation system is closer to the rated running state, and the power generation efficiency of the system is improved. In the expansion power generation process, the residual pressure of the gas storage device is utilized step by step according to the gas storage pressure range required by the operation of each expansion power generation system, so that the utilization efficiency of compressed air is improved. In the selection of the generator of the expansion power generation system, the direct-drive type compressed air energy storage system can omit a high-speed-ratio gear box (or a gear box with a small speed ratio), so that the mechanical loss of the system is reduced, the structure is simple, the service life is long, in addition, the generator can operate in a variable speed manner along with the change of the gas storage amount and the pressure, and a wider operation interval is provided. The generator is ensured to be in high-efficiency operation, the expander is operated near the optimal rotating speed, and the power generation operation efficiency of the compressed air energy storage system is improved.
3. The power generation system utilizes the parallel high-pressure air storage chambers and the parallel expansion power generation systems with different rated power to realize different levels of power output, the operation and the output of the parallel expansion power generation systems are regulated according to the actual operation requirements of the power system by controlling the operation modes of the expansion power generation systems, the different levels of power output are realized, the operation interval of the compressed air energy storage system is enlarged, the compressed air energy storage system can realize the output of smooth wind power, photovoltaic and the like, peak clipping and valley filling functions, the expansion power generation system works near the rated operation working condition as much as possible, and the power generation efficiency of the energy storage system is higher. Under the condition that the compression link is optimally set, the whole working efficiency of the compressed air energy storage system is improved by improving the energy storage efficiency and the power generation efficiency.
Drawings
FIG. 1 is a schematic diagram of a system connection of the present invention;
FIG. 2 is a schematic diagram of a control flow of the method of the present invention;
in the figure: 1. surplus electric energy; 2. a compression system; 3. a first expansion power generation system; 4. a second expansion power generation system; 5. a compressed air storage unit; 6. a cold and hot storage unit; 10. a motor; 11. a first generator; 12. a second generator; 21. a first stage compressor; 22. a second stage compressor; 31. a first stage expander of a first expansion power generation system; 32. a second stage expander of the first expansion power generation system; 33. a first stage expander of a second expansion power generation system; 41. a first heat exchanger; 42. a second heat exchanger; 43. a first stage heat exchanger of a first expansion power generation system; 44. a second stage heat exchanger of the first expansion power generation system; 45. a first stage heat exchanger of a second expansion power generation system; 51. a first switching valve; 52. a second switching valve; 53. a third switching valve; 54. a fourth switching valve; 55. a fifth switching valve; 56. a sixth switching valve; 57. a seventh switching valve; 58. an eighth switching valve; 59. a ninth switching valve; 61. a first throttle valve; 62. a second throttle valve; 63. a third throttle valve; 64. a fourth throttle valve; 65. a fifth throttle valve; 66. a sixth throttle valve; 67. and a seventh throttle valve.
Detailed Description
In order to make the technical problems, technical schemes and beneficial effects to be solved more clear, the application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application.
It will be understood that when an element is referred to as being "mounted" or "disposed" on another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
It is to be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are merely for convenience in describing and simplifying the description based on the orientation or positional relationship shown in the drawings, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus are not to be construed as limiting the application.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
In the following description, for purposes of explanation and not limitation, specific details are set forth such as the particular system architecture, techniques, etc., in order to provide a thorough understanding of the embodiments of the present application. It will be apparent, however, to one skilled in the art that the present application may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present application with unnecessary detail.
It should be understood that the terms "comprises" and/or "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
It should also be understood that the term "and/or" as used in the present specification and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes such combinations.
As used in the present description and the appended claims, the term "if" may be interpreted as "when..once" or "in response to a determination" or "in response to detection" depending on the context. Similarly, the phrase "if a determination" or "if a [ described condition or event ] is detected" may be interpreted in the context of meaning "upon determination" or "in response to determination" or "upon detection of a [ described condition or event ]" or "in response to detection of a [ described condition or event ]".
Furthermore, the terms "first," "second," "third," and the like in the description of the present specification and in the appended claims, are used for distinguishing between descriptions and not necessarily for indicating or implying a relative importance.
Reference in the specification to "one embodiment" or "some embodiments" or the like means that a particular feature, structure, or characteristic described in connection with the embodiment is included in one or more embodiments of the application. Thus, appearances of the phrases "in one embodiment," "in some embodiments," "in other embodiments," and the like in the specification are not necessarily all referring to the same embodiment, but mean "one or more but not all embodiments" unless expressly specified otherwise. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless expressly specified otherwise. "plurality" means "two or more".
Example 1
Fig. 1 shows a schematic structural diagram of a compressed air energy storage system with an expansion power generation system connected in parallel according to a preferred embodiment of the present application (fig. 1 shows a first embodiment of the present application), and for convenience of explanation, only the parts related to this embodiment are shown, and the details are as follows:
the application relates to a compressed air energy storage system with parallel expansion power generation systems, which comprises a compression system, a compressed air storage unit 5, an expansion power generation unit and a cold and hot storage unit 6, wherein the compressed air storage unit 5 comprises a plurality of parallel air storage devices, the expansion power generation unit comprises a plurality of expansion power generation systems with different rated power, the expansion power generation systems are respectively matched with different high-pressure gas pressure intervals and have different operation power intervals, the number of the air storage devices is not lower than that of the expansion power generation systems, the cold and hot storage unit 6 comprises a heat storage device and a cold storage device, the input end of the compression system is connected with surplus electric energy 1, the output end of the compression system is connected with the compressed air storage unit 5, heat generated in the compression process is stored in the heat storage device, the compressed air storage unit 5 is connected with the input end of the expansion power generation system, high-pressure gas input into each expansion machine is heated by a heat exchanger and then connected to an inlet of the expansion machine, and a medium after heat exchange is stored in the cold storage device.
The plurality of parallel gas storage devices are connected with expansion power generation systems with different power generation levels (the number of the gas storage devices is not lower than that of the expansion power generation systems), high-pressure air at the inlet of the expansion power generation system is heated by heat in the heat storage devices, the expansion machines are driven to do work, and heat exchange media after heat exchange are stored in the cold storage devices; the expander is connected with the generator, and the shaft system of the expander rotates at a high speed to drive the generator to generate electricity.
The compressed air storage unit in the system consists of a plurality of high-pressure air storage devices which are connected in parallel, the lower limit value of the pressure of the air storage devices is determined by comprehensively considering the efficiency of a compression link and the overall efficiency of the system according to the original rated power of the compressed air storage system and the residual pressure of the air storage devices after the expansion process is completed, the expansion power generation system is increased, the rated power of the power generation system is increased to be smaller than the rated power of the original system so as to fully utilize the residual gas in the air storage devices, and the expansion power generation unit formed by connecting generators through multistage or single-stage expansion machines with different rated power generation powers.
The power generation system utilizes the parallel high-pressure air storage chambers and the parallel expansion power generation systems with different rated power, and the operation modes of the expansion power generation systems are controlled, so that the operation and the output of the parallel expansion power generation systems are regulated according to the actual operation requirements of the power system, the power output of different grades of power generation is realized, the operation interval of the compressed air energy storage system is enlarged, and the compressed air energy storage system can realize the output of smooth wind power, photovoltaic and the like, peak clipping and valley filling functions, and simultaneously, the expansion power generation system works near the rated operation working condition as much as possible.
In the embodiment, the gas storage system is formed by connecting 2 gas storage devices in parallel, the expansion part is formed by connecting 2 expansion power generation systems with different power generation powers in parallel, the expansion power generation system 1 is formed by two-stage expansion, and the expansion power generation system 2 is formed by single-machine expansion. In this embodiment, the compression system may be multistage compression, the gas storage system may be a plurality of gas storage devices connected in parallel, the expansion part may be a plurality of expansion power generation systems connected in parallel, and the number of stages of the expansion machine in each expansion power generation system may be determined according to the need. The parallel gas storage device analyzed by the embodiment can always meet the normal operation work of the expansion power generation system 1 and the expansion power generation system 2, and the extreme situation that the residual pressure of the gas storage device cannot drive the expansion power generation system is not considered.
The gas storage system of this embodiment is that 2 gas storage devices are connected in parallel, the expansion part is that 2 expansion power generation systems with different rated power are connected in parallel, the first expansion power generation system 3 is two-stage expansion, the second expansion power generation system 4 is single-machine expansion, the rated power generation of the first expansion power generation system 3 is P1, the rated power generation of the second expansion power generation system 4 is P2, and P2< P1, the system can realize three different power generation combinations, namely, the first expansion power generation system 3 works independently, the second expansion power generation system 4 works independently, the first expansion power generation system 3 works simultaneously with the second expansion power generation system 4, and has 3 rated power points of operation, namely P1, P2 and p1+p2.
In one embodiment, each gas storage device in the compressed air storage unit 5 is simultaneously connected to each expansion power generation system, and the parallel gas storage devices sequentially store compressed air until the air pressure in the gas storage devices reaches a set value, the inlets of each gas storage device control the gas inlet of the gas storage device through a switch valve, the flow rate of the gas inlet is controlled through a throttle valve, the outlets of each gas storage device control the gas outlet of the gas storage device through the switch valve, and the flow rate of the gas outlet is controlled through the throttle valve. The gas storage devices connected in parallel are connected with the expansion machines of the expansion power generation systems with different power generation levels, and the inlets of the expansion power generation systems control the gas inlet of the expansion power generation systems through the switch valves; and the heat exchanger inlets of the expansion power generation systems control the circulation of the heat source of the heat storage device through the switch valve. And the flow of the heat exchange medium of the heat exchanger is regulated through a throttle valve so as to control the air inlet and outlet temperature of each stage of expansion machine.
In one embodiment, the compression system 2 includes an electric motor 10, a first stage compressor 21, a second stage compressor 22, a first heat exchanger 41, and a second heat exchanger 42, with the electric motor 10, the first stage compressor 21, and the second stage compressor 22 being serially connected in sequence. The gas outlet of the first stage compressor 21 is connected to the high temperature gas inlet side of the first heat exchanger 41, after the high temperature gas is cooled by the heat exchanger, the low temperature gas outlet side of the first heat exchanger 41 is connected to the inlet of the second stage compressor 22, the gas outlet of the second stage compressor 22 is connected to the high temperature gas inlet side of the second heat exchanger 42, after the high temperature gas is cooled by the heat exchanger, the low temperature gas outlet side of the second heat exchanger 42 is connected to the compressed air storage unit 5, the cold storage device is respectively connected to the inlet sides of the low temperature heat exchange media of the first heat exchanger 41 and the second heat exchanger 42, after the low temperature heat exchange media are subjected to heat exchange by the heat exchanger, the high temperature heat exchange media outlet side of the heat exchanger is connected to the heat storage device for storing the heat generated after the heat exchange.
The surplus electric energy (including surplus electric network electric energy, wind power rejection, photoelectric rejection and other new energy power generation) supplies power to the motor 10, the motor 10 drives the first-stage compressor 21 to compress air, the gas at the outlet of the first-stage compressor 21 is cooled by the first heat exchanger 41 and then is output to the second-stage compressor 22 for further compression, meanwhile, the compressed heat is stored in the heat storage device, the air at the outlet of the second-stage compressor 22 is cooled by the second heat exchanger 42 and then is sequentially stored in the air storage device in the compressed air storage unit 5, the communication and the air inlet flow of the air storage device 1 are controlled through the first switch valve 51 and the first throttle valve 61, the communication and the air inlet flow of the air storage device 2 are controlled through the second switch valve 52 and the second throttle valve 62, and meanwhile, the compressed heat is stored in the heat storage device.
In one embodiment, the front of each stage of expansion machine of the expansion power generation system is respectively provided with a heat exchanger, the output end of the compressed air storage unit 5 is connected to the low-temperature gas inlet side of the heat exchanger before the expansion machine, and the low-temperature gas is heated by the heat exchanger and then is connected to the inlet of the expansion machine by the high-temperature gas outlet side of the heat exchanger.
The heat storage device is connected with the high-temperature heat exchange medium inlet side of the expansion power generation unit heat exchanger through the switch valve and the throttle valve respectively, and the high-temperature heat exchange medium is connected to the cold storage device through the low-temperature heat exchange medium outlet side of the heat exchanger after heat exchange of the heat exchanger. The on-off valve controls the heat storage device to be communicated with the heat exchanger, and the throttle valve adjusts the flow of heat exchange medium of the heat exchanger so as to control the air inlet and outlet temperature of each stage of expansion machine.
In one embodiment, the second expansion power generation system 4 comprises a first stage heat exchanger 45 of the second expansion power generation system, a first stage expander 33 of the second expansion power generation system, and a second generator 12 connected in sequence;
in one embodiment, the first expansion power generation system 3 comprises a third heat exchanger 43, a first stage expander 31 of the first expansion power generation system, a second stage heat exchanger 44 of the first expansion power generation system, a second stage expander 32 of the first expansion power generation system and a first generator 11 connected in sequence;
in one embodiment, the output end of the heat storage device is connected with the high temperature heat exchange medium input end of the third heat exchanger 43 through the fifth throttle valve 65 and the fifth switch valve 55; the high-temperature heat exchange medium input end of the second-stage heat exchanger 44 of the first expansion power generation system is connected with the high-temperature heat exchange medium input end of the second-stage heat exchanger through a sixth throttle valve 66 and a sixth switching valve 56; the high-temperature heat exchange medium input end of the first-stage heat exchanger 45 of the second expansion power generation system is connected with the seventh throttle valve 67 and the ninth switch valve 59; the low-temperature heat exchange medium output ends of the third heat exchanger 43, the second-stage heat exchanger 44 of the first expansion power generation system and the first-stage heat exchanger 45 of the second expansion power generation system are connected with the input end of the cold storage device.
Example two
As shown in fig. 2, a control method of a compressed air energy storage system with an expansion power generation system connected in parallel according to the present invention includes:
step 1, according to the pressure operation interval of the gas storage device, the drivable maximum rated power and the power demand of the energy storage system, comprehensively considering the compression link efficiency and the system overall efficiency to determine the operation pressure range of the gas storage device, and determining the number of the parallel gas storage devices and the expansion power generation systems of the parallel compressed air energy storage power generation system according to the pressure of the gas storage device in a echelon manner, wherein the number of the expansion machines and the rated power of each expansion power generation system;
step 2, determining a target output curve of the compressed air energy storage system in an analysis period according to power supply and power consumption curves of new energy output of wind, light and the like, power supply of a power grid in an area, power consumption of a load and the like; the output curve of the compressed air energy storage system can be determined according to the existing method, the power supply and power utilization power curve of the power system can be determined through power prediction, and the target output curve of the energy storage system is determined by taking the functions of smoothing wind power, photovoltaic output, peak clipping, valley filling and the like of the energy storage system as targets.
Step 3, the generator adopts a direct-drive motor to track a target output curve of the energy storage system and maximize the generator efficiency of the expansion power generation system to construct a target function, set constraint conditions and determine a generator output curve P of each expansion power generation system Eτt (τ＝1、2、…、N)；
Step 4, according to the generator output curve P of each expansion power generation system Eτt Gas storage device operated by each expansion power generation systemSetting a pressure range, judging the opening and closing conditions of valves of the corresponding gas storage device at each moment, and controlling the operation of the expansion power generation system;
and 5, based on the output requirements of each expansion power generation system, adopting a maximum efficiency tracking algorithm to coordinate and control the gas flow and the expansion ratio, so that the expander can still operate near the optimal rotating speed when the power requirements of the compressed air energy storage system change.
In one embodiment, in the step 3, the mathematical expression for tracking the target output curve of the energy storage system is:
wherein T is the current analysis period, T is the total analysis period, and P Et The total power generated in the expansion process of the compressed air energy storage system in the t period is the total power output curve of the generator of each expansion power generation system, P Ct Power is consumed for the compression process of the compressed air energy storage system in the t period of time, P At The target power of the compressed air energy storage system is t time periods;
the objective function for maximizing the generator efficiency of the expansion power generation system is:
wherein N is the total number of expansion power generation systems, tau is the tau-th expansion power generation system, and P Eτt For the actual output of the tau-sleeve expansion power generation system in the t period, eta Eτt For the generator operation efficiency of the tau-sleeve expansion power generation system in the t period, the expression is as follows:
wherein P is Enτ And (5) the rated power of the power generation system is expanded for the tau-th sleeve.
In one embodiment, in the step 3, the constraint condition is:
the total output of each expansion power generation system in the t period is required to meet the output requirement of the energy storage system:
P E1t +P E2t +…+P ENt -P Et ＝0 (4)
the compression and expansion processes of the same gas storage device connection cannot be performed simultaneously:
P Clt ·P Elt ＝0 (5)
wherein P is Clt 、P Elt Respectively representing the power of a compression system and an expansion power generation system which are simultaneously connected with the gas storage device I at the time t;
compressed air energy storage system compression power constraint:
P Cmin ≤P Ct ≤P Cmax (6)
expansion power generation constraint of the compressed air energy storage system:
P Eτmin ≤P Eτt ≤P Eτmax (7)
the expansion power generation systems are connected with the pressure p of the gas storage device τt The following constraints are satisfied:
p τmin ≤p τt ≤p τmax (8)
in one embodiment, the step 4 includes:
step 401, determining the pressure range of the corresponding gas storage device of each expansion power generation system, and sequentially dividing the expansion power generation system into a pressure grade 1, a pressure grade 2, a pressure grade … and a pressure grade N according to the sequence from large to small;
step 402, according to the generator output curves P of the expansion power generation systems in step 3 Eτt Judging an expansion power generation system participating in operation in a t period;
and step 403, sequencing the expansion power generation systems which participate in operation in the t period according to the power from large to small, sequentially selecting matched gas storage devices according to the actual measured gas storage device pressure and aiming at meeting and approaching the pressure operation range of the expansion power generation systems as much as possible, and controlling the operation of the expansion power generation systems.
The expansion power generation systems with different power generation levels are divided into different power generation levels according to the different levels of the storage pressure of the gas storage device, and the expansion power generation systems with different power generation levels are formed by connecting the expansion machines with different levels and the generators with different rated powers.
The range of the pressure level 1 corresponds to the pressure p0 of the gas storage device when the expansion power generation system is operated, the range of the pressure p0 is p2 & lt, p0 & lt, p1, the range of the pressure level 2 corresponds to the pressure p3 of the gas storage device when the expansion power generation system is operated, p3 is p5 & lt, p3 & lt, p4 & lt, p2, namely the upper limit of the pressure level N corresponding to the pressure of the gas storage device when the expansion power generation system is operated is smaller than the lower limit of the pressure level N-1 corresponding to the pressure of the gas storage device when the expansion power generation system is operated. The initial gas pressure of the gas storage device 1 and the gas storage device 2 is p1, the lowest pressure driving the first expansion power generation system 3 is p2, and the lowest pressure driving the second expansion power generation system 4 is p5.
In one embodiment, the step 5 includes:
according to the power P required by each expansion power generation system Eτt Calculating to obtain an optimal expansion ratio pi and an optimal gas flow of the expander;
Obtaining optimized rotation speed omega according to the highest-efficiency rotation speed optimization model * ；
The electronic power transformer is controlled based on the optimized expansion ratio pi and the optimized gas flow, so that the expander can still operate at the optimized rotating speed omega when the power demand of the compressed air energy storage system changes * Nearby.
The power generation process of the first expansion power generation system 3 is as follows:
when the gas storage device 1 drives the first expansion power generation system 3 to generate power: the third switch valve 53 is opened, the gas storage device 1 regulates output gas through the third throttle valve 63 and is connected to the third heat exchanger 43, medium in the heat storage device is transmitted to the third heat exchanger 43 through the fifth switch valve 55 and the fifth throttle valve 65, inlet air of the first-stage expander 31 of the first expansion power generation system is heated, the gas is expanded through the first-stage expander 31 of the first expansion power generation system and then is connected to the second-stage heat exchanger 44 of the first expansion power generation system, medium in the heat storage device is transmitted to the second-stage heat exchanger 44 of the first expansion power generation system through the sixth switch valve 56 and the sixth throttle valve 66, inlet air of the second-stage expander 32 of the first expansion power generation system is heated, the second-stage expander 32 of the first expansion power generation system is expanded again to perform work, the second-stage expander 32 of the first expansion power generation system is connected with the first generator 11, and the generator is driven to generate power. When the gas pressure in the gas storage device 1 falls to p2 or the first expansion power generation system 3 is withdrawn from operation according to the system operation demand, the third switching valve 53, the fifth switching valve 55, and the sixth switching valve 56 are closed.
When the gas storage device 2 drives the first expansion power generation system 3 to generate power: the fourth switch valve 54 is opened, the gas storage device 2 regulates output gas through the fourth throttle valve 64 and is connected to the third heat exchanger 43, medium in the heat storage device is transmitted to the third heat exchanger 43 through the fifth switch valve 55 and the fifth throttle valve 65, inlet air of the first-stage expander 31 of the first expansion power generation system is heated, the gas is expanded through the first-stage expander 31 of the first expansion power generation system and then is connected to the second-stage heat exchanger 44 of the first expansion power generation system, medium in the heat storage device is transmitted to the second-stage heat exchanger 44 of the first expansion power generation system through the sixth switch valve 56 and the sixth throttle valve 66, inlet air of the second-stage expander 32 of the first expansion power generation system is heated, the second-stage expander 32 of the first expansion power generation system is expanded again to perform work, the second-stage expander 32 of the first expansion power generation system is connected with the first generator 11, and the generator is driven to generate power. When the gas pressure in the gas storage device 2 falls to p2 or the first expansion power generation system 3 is withdrawn from operation according to the system operation demand, the fourth switching valve 54, the fifth switching valve 55, and the sixth switching valve 56 are closed.
The power generation process of the second expansion power generation system 4 is as follows:
When the gas storage device 1 drives the second expansion power generation system 4 to generate power: the seventh switch valve 57 is opened, the gas storage device 1 regulates output gas through the third throttle valve 63 and is connected to the first-stage heat exchanger 45 of the second expansion power generation system, medium in the heat storage device is transmitted to the first-stage heat exchanger 45 of the second expansion power generation system through the ninth switch valve 59 and the seventh throttle valve 67, inlet air of the first-stage expander 33 of the second expansion power generation system is heated, and the gas is expanded through the first-stage expander 33 of the second expansion power generation system and then is connected with the second generator 12 to drive the generator to generate power. When the gas pressure in the gas storage device 1 falls to p5 or the second expansion power generation system 4 is taken out of operation according to the system operation demand, the seventh and ninth switching valves 57, 59 are closed.
When the gas storage device 2 drives the second expansion power generation system 4 to generate power: the eighth switch valve 58 is opened, the gas storage device 2 regulates output gas through the fourth throttle valve 64 and is connected to the first-stage heat exchanger 45 of the second expansion power generation system, medium in the heat storage device is transmitted to the first-stage heat exchanger 45 of the second expansion power generation system through the ninth switch valve 59 and the seventh throttle valve 67, inlet air of the first-stage expansion machine 33 of the second expansion power generation system is heated, and the gas is expanded through the first-stage expansion machine 33 of the second expansion power generation system and then is connected with the second generator 12 to drive the generator to generate power. When the gas pressure in the gas storage device 2 falls to p5 or the second expansion power generation system 4 is taken out of operation according to the system operation demand, the eighth switching valve 58, the ninth switching valve 59 are closed.
The combined discharge pattern of the first expansion power generation system 3 and the second expansion power generation system 4 according to the interval range of the power P required by the energy storage system is as follows:
(1) When the power P required by the energy storage system is more than P1, the first expansion power generation system 3 and the second expansion power generation system 4 work simultaneously;
(2) When the power required by the energy storage system changes dynamically or the pressure of compressed gas is insufficient, the expansion power generation system is required to be switched from the first expansion power generation system 3 to the second expansion power generation system 4; when the expansion power generation system is required to be switched from the second expansion power generation system 4 to the first expansion power generation system 3 for operation due to dynamic change of the power required by the energy storage system;
in the above combination scheme, the compressed air pressure is preferably in the range of p5 to p4, and the air storage device is preferably used for driving the second expansion power generation system 4 to generate power.
Specifically, the operation process of the combined power generation mode (1) is as follows:
when the gas storage device 1 drives the first expansion power generation system 3 to generate power: the third switch valve 53 is opened, the gas storage device 1 regulates output gas through the third throttle valve 63 and is connected to the third heat exchanger 43, medium in the heat storage device is transmitted to the third heat exchanger 43 through the fifth switch valve 55 and the fifth throttle valve 65, inlet air of the first-stage expander 31 of the first expansion power generation system is heated, the gas is expanded through the first-stage expander 31 of the first expansion power generation system and then is connected to the second-stage heat exchanger 44 of the first expansion power generation system, medium in the heat storage device is transmitted to the second-stage heat exchanger 44 of the first expansion power generation system through the sixth switch valve 56 and the sixth throttle valve 66, inlet air of the second-stage expander 32 of the first expansion power generation system is heated, the second-stage expander 32 of the first expansion power generation system is expanded again to perform work, the second-stage expander 32 of the first expansion power generation system is connected with the first generator 11, and the generator is driven to generate power.
Meanwhile, when the gas storage device 2 drives the second expansion power generation system 4 to generate power: the eighth switch valve 58 is opened, the gas storage device 2 regulates output gas through the fourth throttle valve 64 and is connected to the first-stage heat exchanger 45 of the second expansion power generation system, medium in the heat storage device is transmitted to the first-stage heat exchanger 45 of the second expansion power generation system through the ninth switch valve 59 and the seventh throttle valve 67, inlet air of the first-stage expansion machine 33 of the second expansion power generation system is heated, and the gas is expanded through the first-stage expansion machine 33 of the second expansion power generation system and then is connected with the second generator 12 to drive the generator to generate power.
In the power generation mode, the expansion power generation system 4 is driven to generate power by a gas storage device with compressed air pressure in the range of p5 to p 4. The connection of the gas storage devices 1 and 2 with the first expansion power generation system 3 and the second expansion power generation system 4 in the operation mode description can be exchanged according to specific pressure and operation conditions.
The operation process of the combination mode (2) is as follows:
1) When the power required by the energy storage system changes dynamically or the compressed gas pressure is insufficient, the expansion power generation system is required to be switched from the first expansion power generation system 3 to the second expansion power generation system 4. The sixth switch valve 56, the fifth switch valve 55 and the third switch valve 53 are closed, the seventh switch valve 57 and the ninth switch valve 59 are opened, the gas storage device 1 regulates output gas through the third throttle valve 63 and is connected to the first-stage heat exchanger 45 of the second expansion power generation system, medium in the heat storage device is transmitted to the first-stage heat exchanger 45 of the second expansion power generation system through the seventh throttle valve 67 and the ninth switch valve 59, inlet air of the first-stage expansion machine 33 of the second expansion power generation system is heated, the gas expands and works through the first-stage expansion machine 33 of the second expansion power generation system, the first-stage expansion machine 33 of the second expansion power generation system is connected with the second generator 12, and the generator is driven to generate power.
2) When the expansion power generation system is required to be switched from the second expansion power generation system 4 to the first expansion power generation system 3 for operation due to dynamic change of the power required by the energy storage system. When the pressure in the gas storage devices 1 and 2 can drive the first expansion power generation system 3 to operate, the gas storage device 1 or 2 can be used to drive the first expansion power generation system 3, and the gas storage device 2 is used to drive the first expansion power generation system 3. At this time, the eighth switching valve 58 and the ninth switching valve 59 are closed, the fourth switching valve 54, the fifth switching valve 55, and the sixth switching valve 56 are opened, and the gas storage device 2 is connected to the first expansion power generation system 3 via the fourth throttle valve 64 and the fourth switching valve 54. During expansion power generation, the gas storage device 2 regulates output gas through the fourth throttle valve 64 and is connected to the third heat exchanger 43, medium in the heat storage device is transmitted to the third heat exchanger 43 through the fifth throttle valve 65 and the fifth switch valve 55, inlet air of the first-stage expander 31 of the first expansion power generation system is heated, the gas is expanded through the first-stage expander 31 of the first expansion power generation system and then is heated through the second-stage heat exchanger 44 of the first expansion power generation system again, the gas is transmitted to the second-stage expander 32 of the first expansion power generation system to be expanded again to do work, and the second-stage expander 32 of the first expansion power generation system is connected with the first generator 11 to drive the generator to generate power.
During the analyzed period t, corresponding to different output curves, there are the following cases:
(1) when the initial gas storage pressure of the gas storage devices 1 and 2 is p 1: when the first expansion power generation system 3 or the second expansion power generation system 4 is operated alone, the valve connected to the gas storage device 1 or 2 may be randomly selected to be opened; when the first expansion power generation system 3 and the second expansion power generation system 4 are simultaneously operated, the third switching valve 53 of the first expansion power generation system 3 connected to the gas storage device 1 is opened, and the eighth switching valve 58 of the second expansion power generation system 4 connected to the gas storage device 2 is opened.
(2) When the initial pressure of the gas storage device 1 is greater than the gas storage device 2. The gas storage device 2 can drive the second expansion power generation system 4 to work, and when the second expansion power generation system 4 works independently, a valve 58 connected to the gas storage device 2 is opened; the gas storage device 1 can drive the first expansion power generation system 3 to operate, and when the first expansion power generation system 3 operates alone, the third switching valve 53 connected to the gas storage device 1 is opened; when the first expansion power generation system 3 and the second expansion power generation system 4 are operated simultaneously, the valves connected to the gas storage devices 1,2 are opened, respectively, and vice versa.
It is noted that the gas inlet on-off valve 51 and the gas outlet on-off valve (third on-off valve 53, seventh on-off valve 57) of the gas storage device 1 are not opened at the same time, and the gas inlet on-off valve 52 and the gas outlet on-off valve (fourth on-off valve 54, eighth on-off valve 58) of the gas storage device 2 are not opened at the same time.
It should be understood that the specific order or hierarchy of steps in the processes disclosed are examples of exemplary approaches. Based on design preferences, it is understood that the specific order or hierarchy of steps in the processes may be rearranged without departing from the scope of the present disclosure. The accompanying method claims present elements of the various steps in a sample order, and are not meant to be limited to the specific order or hierarchy presented.
In the foregoing detailed description, various features are grouped together in a single embodiment for the purpose of streamlining the disclosure. This method of disclosure is not to be interpreted as reflecting an intention that the claimed embodiments of the subject matter require more features than are expressly recited in each claim. Rather, as the following claims reflect, application lies in less than all features of a single disclosed embodiment. Thus the following claims are hereby expressly incorporated into this detailed description, with each claim standing on its own as a separate preferred embodiment of this application.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. As will be apparent to those skilled in the art; various modifications to these embodiments will be readily apparent, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the disclosure. Thus, the present disclosure is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
The foregoing description includes examples of one or more embodiments. It is, of course, not possible to describe every conceivable combination of components or methodologies for purposes of describing the aforementioned embodiments, but one of ordinary skill in the art may recognize that many further combinations and permutations of various embodiments are possible. Accordingly, the embodiments described herein are intended to embrace all such alterations, modifications and variations that fall within the scope of the appended claims. Furthermore, as used in the specification or claims, the term "comprising" is intended to be inclusive in a manner similar to the term "comprising" as "comprising" is interpreted when employed as a transitional word in a claim. Furthermore, any use of the term "or" in the specification of the claims is intended to mean "non-exclusive or".
The above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present application, and are intended to be included in the scope of the present application.

Claims (10)

1. The utility model provides a parallelly connected compressed air energy storage system of inflation power generation system, its characterized in that includes compression system, compressed air storage unit (5), inflation power generation unit and cold and hot storage unit (6), compressed air storage unit (5) are including a plurality of parallelly connected gas storage devices, inflation power generation unit includes a plurality of parallelly connected inflation power generation system, a plurality of inflation power generation system respectively with different high-pressure gas pressure interval matches, have different running power intervals, the number of gas storage device is not less than the number of inflation power generation system, cold and hot storage unit (6) are including heat accumulation device and cold storage device, the surplus electric energy is connected to compression system's input, compressed air storage unit (5) are input to after the heat transfer medium heat storage that cold storage device stored to compression system output high-pressure gas, the expander of inflation power generation system is input to after the heat transfer medium heat storage device heat storage of compressed air storage unit (5) output.
2. The compressed air energy storage system with parallel expansion power generation system of claim 1, wherein: each gas storage device in the compressed air storage unit (5) is simultaneously connected to a respective expansion power generation system.
3. The compressed air energy storage system with parallel expansion power generation system of claim 1, wherein: the gas storage device is communicated with the expansion power generation system through a switch valve.
4. The compressed air energy storage system with parallel expansion power generation system of claim 1, wherein: and the air flow is controlled between the air storage device and the expansion power generation system through a throttle valve.
5. The compressed air energy storage system with parallel expansion power generation system of claim 1, wherein: the compression system (2) comprises a motor (10), a first-stage compressor (21), a second-stage compressor (22), a …, an M-stage compressor, a first heat exchanger (41), a second heat exchanger (42), a … and an M-stage heat exchanger, wherein the motor (10), the first-stage compressor (21), the second-stage compressor (22), the … and the M-stage compressor are sequentially connected in series;
the gas outlet of the ith stage compressor is connected to the high-temperature gas inlet side of the ith stage heat exchanger, the high-temperature gas is cooled by the heat exchanger and then is connected to the inlet of the (i+1) th stage compressor from the low-temperature gas outlet side of the ith stage heat exchanger, the gas outlet of the Mth stage compressor is connected to the high-temperature gas inlet side of the Mth stage heat exchanger, and the low-temperature gas outlet side of the Mth stage heat exchanger is connected to the compressed air storage unit (5) after the high-temperature gas is cooled by the heat exchanger;
The cold storage device is respectively connected with the low-temperature heat exchange medium inlet sides of a first heat exchanger (41), a second heat exchanger (42), a … and an M-th stage heat exchanger of the compression system, and the low-temperature heat exchange medium is connected to the heat storage device through the high-temperature heat exchange medium outlet side of the heat exchanger after heat exchange of the heat exchanger, wherein i=1, 2, … and M-1.
6. The compressed air energy storage system with parallel expansion power generation system of claim 1, wherein: the expansion power generation unit comprises a first expansion power generation system (3), a second expansion power generation system (4), a … and an Nth expansion power generation system, wherein rated power of the jth expansion power generation system is P Nj Rated power of the j+1 expansion power generation system is P N(j+1) And P is N(j+1) <P Nj ，j＝1，2，…，N-1。
7. The compressed air energy storage system with parallel expansion power generation system of claim 6, wherein: the second expansion power generation system (4) comprises a first-stage heat exchanger (45) of the second expansion power generation system, a first-stage expander (33) of the second expansion power generation system, a … …, an L-th-stage heat exchanger of the second expansion power generation system, an L-th-stage expander of the second expansion power generation system and a second generator (12) which are sequentially connected.
8. The compressed air energy storage system with parallel expansion power generation system of claim 6, wherein: the first expansion power generation system (3) comprises a first-stage heat exchanger (43) of the first expansion power generation system, a first-stage expander (31) of the first expansion power generation system, a second-stage heat exchanger (44) of the first expansion power generation system, a second-stage expander (32) of the first expansion power generation system, … …, a P-stage heat exchanger of the first expansion power generation system, a P-stage expander of the first expansion power generation system and a first generator (11) which are sequentially connected.
9. The compressed air energy storage system with parallel expansion power generation system of claim 1, wherein: the front parts of all stages of expansion machines of the expansion power generation system are respectively provided with a heat exchanger, the output end of the compressed air storage unit (5) is connected to the low-temperature gas inlet side of the heat exchanger before the expansion machine, and the low-temperature gas is connected to the inlet of the expansion machine from the high-temperature gas outlet side of the heat exchanger after being heated by the heat exchanger;
the heat storage device is respectively connected with the high-temperature medium inlet side of the heat exchanger of the expansion system, the high-temperature medium is connected to the cold storage device through the low-temperature heat exchange medium outlet side of the heat exchanger after compressed gas is heated by the heat exchanger, the high-temperature medium inlet side of the heat exchanger of the expansion system is provided with a switching valve for controlling the circulation of the heat exchange medium, and the equipment throttle valve is used for controlling the flow of the heat exchange medium so as to control the air inlet and outlet temperature of each stage of expansion machine.
10. The compressed air energy storage system with parallel expansion power generation system of claim 1, wherein: the generators in the expansion power generation unit are all direct-drive motors.
CN202310661267.4A 2023-06-06 2023-06-06 Compressed air energy storage system with expansion power generation systems connected in parallel Pending CN116658264A (en)

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