Non-design working condition operation method of compressed air energy storage system
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A technology of compressed air energy storage, non-design working conditions, applied in mechanical equipment, wind energy power generation, heat storage equipment, etc. Energy storage system performance degradation and other problems, to achieve the effect of improving energy conversion and waste heat utilization, improving operation stability and performance under variable conditions, and improving operation stability
Active Publication Date: 2022-02-11
XI AN JIAOTONG UNIV
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However, changes in environmental conditions will have a greater impact on the operating range of the compressor, the gas storage capacity, and the output power of the expander.
When the ambient temperature changes, the stable operating range of the compressor will shift due to its own working characteristics, which will cause the performance of the energy storage system to decline, and even affect the safe and stable operation of the system
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Embodiment 1
[0108] Such as figure 1 For the compressed air energy storage system shown, when the operating environment temperature is 5°C, its operation method is determined as follows:
[0109] Step 1: Determine the operating range of the compression subsystem and select the operating mode of the heat storage subsystem.
[0110] Determine compressor train mass flow and pressure range:
[0113] Set the operation mode of the heat storage subsystem: in the energy storage stage, the air cooler operates in the mode of adjustable outlet temperature difference; in the energy release stage, the reheater operates in the mode of minimum pinch temperature difference.
[0114] Step 2: Set the outlet temperature difference of the hot end of the air cooler, and establish a parameter control model for the components in the energy storage stage.
[0115] Set the outlet temperature difference ΔT of the hot end of the...
Embodiment 2
[0125] Such as figure 1 For the compressed air energy storage system shown, when the operating environment temperature is 35°C, the optimal operation method for its full-cycle efficiency is as follows:
[0126] Determine compressor train mass flow and pressure range:
[0129] Set the air cooler and reheater of the heat storage subsystem to operate in the minimum pinch temperature difference mode;
[0130] Set the outlet temperature difference ΔT of the hot end of the air cooler o = 10°C.
[0131] At this time, the full-cycle efficiency of the system can be obtained as 61.34%, and the output power is 159.9MW.
[0132] In summary, the non-design operation method of the compressed air energy storage system provided by the embodiment of the present application comprehensively considers the impact of environmental state changes on the main working components of the compressed air energy storag...
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Abstract
The invention discloses a non-design working condition operation method of a compressed air energy storage system. The method comprises the following steps of: determining an operation range of a compression subsystem according to a system operation environment temperature, and selecting an operation mode of a heat storage subsystem; setting an air cooler hot end outlet temperature difference, and establishing an energy storage stage component parameter regulation and control model; determining operation parameters of an expansion subsystem, and establishing an energy release stage component parameter regulation and control model; and establishing a full-cycle efficiency optimal operation model of the system. The influence of environment state change on main working parts of the compressed air energy storage system is comprehensively considered, the parameter operation range of the system under the variable working conditions is determined, and the operation stability is improved. The operation mode of the heat storage subsystem is selected according to the environment temperature, operation parameters are optimized, the energy conversion and waste heat utilization effects are effectively improved, energy efficiency maximization of the system within the whole environment temperature range is achieved, the whole-period efficiency higher than the design working condition is obtained, and the operation stability and the variable working condition performance of the compressed air energy storage system under the variable working condition are improved.
Description
technical field [0001] The invention belongs to the technical field of renewable energy power generation and energy storage, and in particular relates to a non-design operating method of a compressed air energy storage system. Background technique [0002] Compressed air energy storage technology is an effective way to achieve large-scale consumption and stable grid connection of renewable energy such as wind energy and solar energy. The variable working condition operation of compressed air energy storage system has become one of the main challenges restricting its efficient operation and commercial application. [0003] For the problem of variable-condition operation strategy, most of them only consider two typical variable-condition operation problems caused by the dynamic change of gas storage chamber pressure and load fluctuation, while ignoring the influence of the environment. However, changes in environmental conditions will have a greater impact on the operating ra...
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