A method for controlling hydrogen filling and discharging sequence of hydrogen storage bottle group of hydrogen refueling station

Abstract

The present application relates to hydrogen charging and discharging technology field, aims at solving the problem of low utilization rate of hydrogen storage tank group, uneven cycle times and service life, provides a kind of hydrogen filling station hydrogen storage bottle group charging and discharging sequence control method, including PLC control program, hydrogen storage bottle group control program, several hydrogen storage tanks, hydrogen charging pressure pipeline and hydrogen discharging pressure pipeline;Several hydrogen charging pressure pipelines are equipped with pressure sensor, manual valve and hydrogen charging electronic control valve, and several hydrogen discharging pressure pipelines are equipped with hydrogen discharging electronic control valve;The data of pressure sensor is transmitted to PLC control program and several hydrogen storage tanks are sorted according to pressure size, and PLC control program sends pulse signal to hydrogen storage bottle group control program to control several hydrogen charging electronic control valves and hydrogen discharging electronic control valves to open and close according to the pressure of each hydrogen storage tank, so as to charge or discharge several hydrogen storage tanks.The beneficial effects of the present application are high utilization rate of each hydrogen storage tank, close hydrogen charging and discharging cycle times, uniform service life and low risk of hydrogen filling station stop.

Description

Technical Field

[0001] This invention relates to the field of hydrogen charging and discharging control technology, and more specifically, to a method for controlling the charging and discharging sequence of hydrogen storage cylinders in a hydrogen refueling station. Background Technology

[0002] Existing hydrogen refueling stations typically consist of high-pressure hydrogen storage cylinders (sets), medium-pressure hydrogen storage cylinders (sets), and low-pressure hydrogen storage cylinders (sets). Within a single hydrogen refueling station, the specifications and models of the hydrogen storage cylinders are exactly the same.

[0003] Currently, the order of use for the three types of hydrogen storage cylinders at the site is fixed: high-pressure hydrogen storage cylinders are always high-pressure, medium-pressure hydrogen storage cylinders are always medium-pressure, and low-pressure hydrogen storage cylinders are always low-pressure. In actual refueling, low-pressure hydrogen storage cylinders (groups) are used first, then medium-pressure hydrogen storage cylinders (groups), and finally high-pressure hydrogen storage cylinders (groups). As a result, low-pressure hydrogen storage cylinders are used more frequently than medium-pressure hydrogen storage cylinders, and medium-pressure hydrogen storage cylinders are used more frequently than high-pressure hydrogen storage cylinders. This leads to a much greater number of hydrogen charging and discharging cycles for low-pressure hydrogen storage cylinders than for medium-pressure and high-pressure hydrogen storage cylinders, reducing the lifespan of low-pressure hydrogen storage cylinders and increasing the risk of malfunctions due to excessively high usage frequency of a single cylinder group. Summary of the Invention

[0004] The present invention aims to provide a method for controlling the charging and discharging sequence of hydrogen storage cylinders in hydrogen refueling stations, so as to solve the problems of low utilization rate of high, medium and low pressure hydrogen storage tanks, uneven charging and discharging cycles and service life in the prior art.

[0005] The embodiments of the present invention are implemented as follows:

[0006] This invention provides a method for controlling the charging and discharging sequence of hydrogen storage cylinder groups in a hydrogen refueling station, which includes a PLC control program (not shown in the figure), a hydrogen storage cylinder group control program (not shown in the figure), and several hydrogen storage tanks;

[0007] Several hydrogen storage tanks are arranged side by side, and one end of each of the hydrogen storage tanks is connected to a hydrogen filling pressure-resistant pipe. Each of the hydrogen filling pressure-resistant pipes is connected to a hydrogen releasing pressure-resistant pipe. The hydrogen filling pressure-resistant pipes are connected in parallel to each other, and the hydrogen releasing pressure-resistant pipes are connected in parallel to each other.

[0008] Several of the aforementioned hydrogen-filling pressure-resistant pipes are connected to a pressure sensor at one end near the aforementioned hydrogen storage tank for detecting the internal pressure of the aforementioned hydrogen storage tank. A manual valve is connected to the pipe between the pressure sensor and the aforementioned hydrogen storage tank. Several of the aforementioned hydrogen-filling pressure-resistant pipes are connected to a hydrogen-filling electronic control valve. Several of the aforementioned hydrogen-releasing pressure-resistant pipes are connected to a hydrogen-releasing electronic control valve.

[0009] The PLC control program is electrically connected to the hydrogen storage cylinder group control program and the pressure sensor. The hydrogen storage cylinder group control program is electrically connected to the manual valve, the hydrogen filling electronic control valve and the hydrogen releasing electronic control valve.

[0010] The PLC control program collects data from the pressure sensors and sorts the hydrogen storage tanks according to their pressure. Then, the PLC control program sends a pulse signal to the hydrogen storage tank group control program. The hydrogen storage tank group control program then controls the opening and closing of the hydrogen filling electronic control valve and the hydrogen releasing electronic control valve in order of pressure from high to low or from low to high, so as to replenish or release gas from the hydrogen storage tanks.

[0011] Optionally: When the pressure of any of the above-mentioned hydrogen storage tanks is lower than the start-up set value, the above-mentioned PLC control program sends a pulse signal to the above-mentioned hydrogen storage tank group control program. After receiving the pulse signal, the above-mentioned hydrogen storage tank group control program immediately latches the real-time pressure value of each of the above-mentioned hydrogen storage tanks. The above-mentioned PLC control program sorts the above-mentioned hydrogen storage tanks according to the pressure value, temporarily stores the sorting result, and then replenishes the corresponding above-mentioned hydrogen storage tanks in descending order of pressure.

[0012] Optionally: When the pressure of several of the above-mentioned hydrogen storage tanks reaches the shutdown set value, the above-mentioned PLC control program controls the above-mentioned hydrogen filling electronic control valve or the above-mentioned hydrogen discharging electronic control valve through the above-mentioned hydrogen storage cylinder group control program to stop the replenishment of hydrogen to several of the above-mentioned hydrogen storage tanks.

[0013] Optionally: The hydrogen pressure inside several of the above-mentioned hydrogen storage tanks may be different.

[0014] With this setup, in actual use, the accuracy of the aforementioned pressure sensors and PLC control program can precisely display six or more decimal places. Furthermore, the pressure value is not completely constant; therefore, at any given moment, the pressure value of each hydrogen storage cylinder is different. This facilitates real-time sorting of the hydrogen storage tanks. Testing has shown that under the same conditions, the sorting results are different each time. This is beneficial because the order of the hydrogen storage tanks changes continuously when arranging hydrogen filling and discharging, improving the utilization efficiency of the hydrogen storage containers. It also ensures that the number of hydrogen filling and discharging cycles for each tank is similar, resulting in a more even lifespan for cylinder groups at different pressure levels and reducing the risk of hydrogen refueling stations shutting down due to hydrogen storage tank malfunctions.

[0015] Optionally: The pressure sensor collects the pressure of the hydrogen storage tank and transmits the collected data to the PLC control program. The PLC control program sorts the hydrogen storage tanks according to their pressure values. The PLC control program sends a pulse signal to the hydrogen storage tank group control program. After receiving the pulse signal, the hydrogen storage tank group control program controls the opening of the hydrogen filling electronic control valve, the closing of the hydrogen discharging electronic control valve, and the opening of the manual valve, so that hydrogen is added to the hydrogen storage tank through the hydrogen compressor.

[0016] Optionally: When a hydrogen refueling station has a hydrogen refueling demand, the aforementioned PLC control program sends a pulse signal to the aforementioned hydrogen storage cylinder group control program. Upon receiving the pulse signal, the aforementioned hydrogen storage cylinder group control program immediately latches the real-time pressure value of each of the aforementioned hydrogen storage tanks. The aforementioned PLC control program sorts the aforementioned hydrogen storage tanks according to the pressure value and saves the sorting result. Then, the aforementioned PLC control program, through the aforementioned hydrogen storage cylinder group control program, adds hydrogen from the aforementioned hydrogen storage tanks outward in ascending order until the hydrogen refueling is completed. After the hydrogen refueling is completed, the aforementioned pressure sensor collects the current sorting result to prepare for the next refueling.

[0017] Optionally: When the pressure of any one of the above hydrogen storage tanks is lower than the start-up set value, return to the gas replenishment stage and replenish the above hydrogen storage tanks with gas.

[0018] Optionally: The pressure sensor collects the pressure of the hydrogen storage tank and transmits the collected data to the PLC control program. The PLC control program sorts the hydrogen storage tanks according to their pressure values. The PLC control program sends a pulse signal to the hydrogen storage cylinder group control program. After receiving the pulse signal, the hydrogen storage cylinder group control program controls the hydrogen filling electronic control valve to close, the hydrogen discharging electronic control valve to open, and the manual valve to be in the open state, so that hydrogen is released to the outside through the hydrogen refueling equipment.

[0019] Optionally: A maintenance valve is provided on the pipeline of the pressure sensor mentioned above.

[0020] This configuration facilitates the replacement or repair of the pressure sensor, effectively ensuring the accuracy of the data collected by the pressure sensor and improving the control precision of the entire system.

[0021] Optionally: The hardware of the above PLC control program mainly includes: a logic controller CPU (PLC), digital input / output modules, analog input modules, and electrical components such as isolation safety barriers, surge protectors, relays, and matching low-voltage electrical appliances for signal isolation;

[0022] The above PLC control program is written using professional PLC program development software, according to the provided control logic. After compilation, it is downloaded to the logic controller CPU, which is responsible for the entire automatic control process without human intervention.

[0023] First, the pressure of several of the aforementioned hydrogen storage tanks is converted into a 4mA to 20mA signal by the aforementioned pressure sensor, and after passing through the surge protector and the isolation safety barrier, it enters the analog input module of the aforementioned PLC control program.

[0024] Secondly, the logic controller CPU converts the 4mA to 20mA signal acquired by the analog input module into the actual pressure value of the aforementioned hydrogen storage tank.

[0025] Finally, the logic controller CPU automatically judges and processes according to the written control program, and outputs a switch signal to the hydrogen storage cylinder group control program. The hydrogen storage cylinder group control program controls the opening and closing of the hydrogen filling electronic control valve and the hydrogen releasing electronic control valve on site.

[0026] Compared with the prior art, the beneficial effects of adopting the above technical solution are as follows: This invention proposes a method for controlling the filling and discharging sequence of hydrogen storage cylinder groups in hydrogen refueling stations. The method of randomly sorting during filling determines the high-pressure hydrogen storage container, medium-pressure hydrogen storage container, and low-pressure hydrogen storage container. This not only improves the utilization efficiency of the hydrogen storage container, but also makes the number of hydrogen filling and discharging cycles of each hydrogen storage cylinder similar, making the lifespan of cylinder groups of different pressure levels more average, and reducing the risk of hydrogen refueling stations being shut down due to hydrogen storage cylinder failure.

[0027] In summary, the method for controlling the charging and discharging sequence of hydrogen storage cylinders in a hydrogen refueling station disclosed in this invention has the beneficial effects of high utilization rate of high, medium and low pressure hydrogen storage tanks, similar charging and discharging cycles of high, medium and low pressure hydrogen storage tanks, uniform service life, and reduced risk of hydrogen refueling station shutdown due to hydrogen storage cylinder failure. Attached Figure Description

[0028] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of a method for controlling the charging and discharging sequence of hydrogen storage cylinders in a hydrogen refueling station, as described in an embodiment of the present invention.

[0030] Icons: 1-Hydrogen storage tank, 2-Hydrogen filling pressure-resistant pipeline, 3-Hydrogen releasing pressure-resistant pipeline, 4-Pressure sensor, 5-Manual valve, 6-Hydrogen filling electronic control valve, 7-Hydrogen releasing electronic control valve, 8-Maintenance valve, 9-Hydrogen compressor, 10-Hydrogen refueling equipment. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0032] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0033] Example 1

[0034] See Figure 1 This embodiment proposes a method for controlling the charging and discharging sequence of hydrogen storage cylinder groups in a hydrogen refueling station, including a PLC control program (not shown in the figure), a hydrogen storage cylinder group control program (not shown in the figure), and several hydrogen storage tanks 1;

[0035] Several hydrogen storage tanks 1 are arranged side by side, and one end of each hydrogen storage tank 1 is connected to a hydrogen filling pressure-resistant pipe 2. Each hydrogen filling pressure-resistant pipe 2 is connected to a hydrogen discharging pressure-resistant pipe 3. The hydrogen filling pressure-resistant pipes 2 are connected in parallel, and the hydrogen discharging pressure-resistant pipes 3 are connected in parallel.

[0036] Several hydrogen-filling pressure-resistant pipes 2 are connected to a pressure sensor 4 for detecting the internal pressure of hydrogen storage tank 1 at one end near the hydrogen storage tank 1. A manual valve 5 is connected to the pipe between the pressure sensor 4 and the hydrogen storage tank 1. Several hydrogen-filling pressure-resistant pipes 2 are connected to a hydrogen-filling electronic control valve 6. Several hydrogen-releasing pressure-resistant pipes 3 are connected to a hydrogen-releasing electronic control valve 7.

[0037] The PLC control program is electrically connected to the hydrogen storage tank group control program and pressure sensor 4. The hydrogen storage tank group control program is electrically connected to manual valve 5, hydrogen filling electronic control valve 6 and hydrogen discharging electronic control valve 7.

[0038] The PLC control program collects data from the pressure sensor 4, sorts several hydrogen storage tanks 1 according to their pressure, and then sends a pulse signal to the hydrogen storage tank group control program. The hydrogen storage tank group control program then controls several hydrogen filling electronic control valves 6 and hydrogen discharging electronic control valves 7 to open and close in order of pressure from high to low or from low to high, so as to replenish or release gas from several hydrogen storage tanks 1.

[0039] When the pressure of any hydrogen storage tank 1 is lower than the start-up set value, the PLC control program sends a pulse signal to the hydrogen storage cylinder group control program. After receiving the pulse signal, the hydrogen storage cylinder group control program immediately latches the real-time pressure value of each hydrogen storage tank 1. Based on the magnitude of the pressure value, the PLC control program sorts the hydrogen storage tanks 1 according to the pressure magnitude, temporarily stores the sorting result, and then replenishes the corresponding hydrogen storage tanks 1 in descending order of pressure.

[0040] When the pressure of several hydrogen storage tanks 1 reaches the shutdown set value, the PLC control program controls the hydrogen filling electronic control valve 6 or the hydrogen discharging electronic control valve 7 through the hydrogen storage cylinder group control program to stop the replenishment of hydrogen to several hydrogen storage tanks 1.

[0041] The hydrogen pressure inside each of the several hydrogen storage tanks 1 is different. In actual use, the accuracy of the on-site pressure sensor 4 and the PLC control program can accurately display six or more decimal places, and the pressure value is not completely constant. Therefore, at any given time, the pressure value of each hydrogen storage tank is different, which facilitates the real-time sorting of hydrogen storage tanks 1. After testing, under the same conditions, the results of each sorting are different. This is beneficial because the order of hydrogen storage tanks 1 is constantly changing when arranging hydrogen filling and discharging, which can improve the utilization efficiency of hydrogen storage containers, make the number of hydrogen filling and discharging cycles of each hydrogen storage tank 1 similar, make the lifespan of the cylinder group of each pressure level more average, and reduce the risk of hydrogen refueling station shutdown due to hydrogen storage tank 1 failure.

[0042] Pressure sensor 4 collects the pressure of the hydrogen storage tank and transmits the collected data to the PLC control program. The PLC control program sorts the hydrogen storage tanks 1 according to the pressure value. The PLC control program sends a pulse signal to the hydrogen storage cylinder group control program. After receiving the pulse signal, the hydrogen storage cylinder group control program controls the opening of the hydrogen filling electronic control valve 6, the closing of the hydrogen discharging electronic control valve 7, and the opening of the manual valve 5, so that hydrogen is added to the hydrogen storage tank 1 through the hydrogen compressor 9.

[0043] When a hydrogen refueling station needs hydrogen, the PLC control program sends a pulse signal to the hydrogen storage tank group control program. Upon receiving the pulse signal, the hydrogen storage tank group control program immediately latches the real-time pressure value of each hydrogen storage tank 1. The PLC control program sorts the hydrogen storage tanks 1 according to the pressure value and saves the sorting result. Then, the PLC control program, through the hydrogen storage tank group control program, adds hydrogen from the hydrogen storage tank 1 outwards in ascending order until the refueling is completed. After the refueling is completed, the pressure sensor 4 collects the current sorting result to prepare for the next refueling.

[0044] When the pressure of several hydrogen storage tanks 1 is lower than the start-up set value, the system returns to the gas replenishment stage and replenishes the hydrogen storage tanks 1 with gas.

[0045] Pressure sensor 4 collects the pressure of the hydrogen storage tank and transmits the collected data to the PLC control program. The PLC control program sorts the hydrogen storage tanks 1 according to the pressure value. The PLC control program sends a pulse signal to the hydrogen storage cylinder group control program. After receiving the pulse signal, the hydrogen storage cylinder group control program controls the hydrogen filling electronic control valve 6 to close, the hydrogen discharging electronic control valve 7 to open, and the manual valve 5 to be in the open state, so that hydrogen is released to the outside through the hydrogen refueling equipment 10.

[0046] A maintenance valve 8 is installed on the pipeline of pressure sensor 4. The maintenance valve 8 facilitates the replacement or maintenance of pressure sensor 4, effectively ensuring the accuracy of the data collected by pressure sensor 4 and improving the control precision of the entire system.

[0047] Working principle: The hardware of the PLC control program mainly consists of: a logic controller CPU (PLC), digital input / output modules, analog input modules, and electrical components such as isolation safety barriers, surge protectors, relays, and supporting low-voltage electrical appliances for signal isolation.

[0048] The PLC control program uses professional PLC program development software. It is written according to the provided control logic. After compilation, it is downloaded to the logic controller CPU. The logic controller CPU is responsible for the entire automatic control process, which does not require human operation.

[0049] First, the pressure of several hydrogen storage tanks 1 is converted into a 4mA~20mA signal by pressure sensor 4, and then enters the analog input module of the PLC control program after passing through surge protector and isolation safety barrier;

[0050] Secondly, the logic controller CPU converts the 4mA to 20mA signal acquired by the analog input module into the actual pressure value of hydrogen storage tank 1.

[0051] Finally, the logic controller CPU automatically judges and processes according to the pre-written control program, outputs switch signals to the hydrogen storage cylinder group control program, and controls the opening and closing of the on-site hydrogen filling electronic control valve 6 and hydrogen discharging electronic control valve 7 through the hydrogen storage cylinder group control program.

[0052] Compared with the prior art, the beneficial effects of adopting the above technical solution are as follows: This invention proposes a method for controlling the filling and discharging sequence of hydrogen storage cylinder groups in hydrogen refueling stations. The method of randomly sorting during filling determines the high-pressure hydrogen storage container, medium-pressure hydrogen storage container, and low-pressure hydrogen storage container. This not only improves the utilization efficiency of the hydrogen storage container, but also makes the number of hydrogen filling and discharging cycles of each hydrogen storage cylinder similar, making the lifespan of cylinder groups of different pressure levels more average, and reducing the risk of hydrogen refueling stations being shut down due to hydrogen storage cylinder failure.

[0053] Example 2

[0054] In conjunction with Embodiment 1, in this embodiment, there are three hydrogen storage tanks 1, and the three hydrogen storage tanks 1 form a group. Through the control method of the present invention, it is possible to effectively avoid frequent gas replenishment and venting of one or a group of hydrogen storage tanks 1, while the utilization rate of other tank groups is low for a long time. Through the control method of the present invention, the number of uses of all hydrogen storage tanks 1 can be more even, thereby improving the overall utilization rate of hydrogen storage tanks 1 and extending the life of the hydrogen storage tank group 1.

[0055] In another embodiment, the number of hydrogen storage tanks 1 can be unlimited. As long as the control method of the present invention is used, the order of filling and discharging hydrogen in each hydrogen storage tank 1 can be adjusted so that the use of each hydrogen storage tank 1 is more uniform.

[0056] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for controlling the charging and discharging sequence of hydrogen storage cylinder groups in a hydrogen refueling station, characterized in that: Includes PLC control program, hydrogen storage cylinder group control program and several hydrogen storage tanks; Several hydrogen storage tanks are arranged side by side, and one end of each of the hydrogen storage tanks is connected to a hydrogen filling pressure-resistant pipe. Each hydrogen filling pressure-resistant pipe is connected to a hydrogen releasing pressure-resistant pipe. Each of the hydrogen filling pressure-resistant pipes is connected in parallel, and each of the hydrogen releasing pressure-resistant pipes is connected in parallel. A pressure sensor for detecting the internal pressure of the hydrogen storage tank is connected to one end of several of the hydrogen-filling pressure-resistant pipes near the hydrogen storage tank. A manual valve is connected to the pipe between the pressure sensor and the hydrogen storage tank. A hydrogen-filling electronic control valve is connected to each of the several hydrogen-filling pressure-resistant pipes. A hydrogen-releasing electronic control valve is connected to each of the several hydrogen-releasing pressure-resistant pipes. The PLC control program is electrically connected to the hydrogen storage cylinder group control program and the pressure sensor, and the hydrogen storage cylinder group control program is electrically connected to the manual valve, the hydrogen filling electronic control valve and the hydrogen releasing electronic control valve; The PLC control program collects data from the pressure sensor, sorts several hydrogen storage tanks according to their pressure, and then sends a pulse signal to the hydrogen storage tank group control program. The hydrogen storage tank group control program then controls several hydrogen filling electronic control valves and hydrogen releasing electronic control valves to open and close in order of pressure from high to low or from low to high, so as to replenish or release gas from several hydrogen storage tanks. When a hydrogen refueling station needs hydrogen refueling, the PLC control program sends a pulse signal to the hydrogen storage tank group control program. Upon receiving the pulse signal, the hydrogen storage tank group control program immediately latches the real-time pressure value of each hydrogen storage tank. The PLC control program sorts the hydrogen storage tanks according to their pressure values ​​and saves the sorting results. Then, the PLC control program, through the hydrogen storage tank group control program, adds hydrogen from the tanks outward in ascending order of pressure until refueling is complete. After refueling is completed, the pressure sensor collects the current sorting results to prepare for the next refueling. When the pressure of any of the hydrogen storage tanks falls below the start-up set value, the system returns to the gas replenishment phase to replenish the hydrogen storage tank.

2. The method for controlling the charging and discharging sequence of hydrogen storage cylinder groups in a hydrogen refueling station according to claim 1, characterized in that: When the pressure of any of the hydrogen storage tanks is lower than the start-up set value, the PLC control program sends a pulse signal to the hydrogen storage tank group control program. After receiving the pulse signal, the hydrogen storage tank group control program immediately latches the real-time pressure value of each hydrogen storage tank. The PLC control program sorts the hydrogen storage tanks according to the pressure value, temporarily stores the sorting result, and then replenishes the corresponding hydrogen storage tanks in descending order of pressure.

3. The method for controlling the charging and discharging sequence of hydrogen storage cylinder groups in a hydrogen refueling station according to claim 1, characterized in that: When the pressure of all of the hydrogen storage tanks reaches the shutdown set value, the PLC control program controls the hydrogen filling electronic control valve or the hydrogen releasing electronic control valve through the hydrogen storage cylinder group control program to stop replenishing hydrogen to the hydrogen storage tanks.

4. The method for controlling the charging and discharging sequence of hydrogen storage cylinder groups in a hydrogen refueling station according to claim 1, characterized in that: The hydrogen pressure inside the various hydrogen storage tanks is not the same.

5. The method for controlling the charging and discharging sequence of hydrogen storage cylinder groups in a hydrogen refueling station according to claim 3, characterized in that: The pressure sensor collects the pressure of the hydrogen storage tank and transmits the collected data to the PLC control program. The PLC control program sorts the hydrogen storage tanks according to their pressure values ​​and sends a pulse signal to the hydrogen storage cylinder group control program. Upon receiving the pulse signal, the hydrogen storage cylinder group control program controls the opening of the hydrogen filling electronic control valve, the closing of the hydrogen discharging electronic control valve, and the opening of the manual valve, so that hydrogen is added to the hydrogen storage tank through the hydrogen compressor.

6. The method for controlling the charging and discharging sequence of hydrogen storage cylinder groups in a hydrogen refueling station according to claim 1, characterized in that: The pressure sensor collects the pressure of the hydrogen storage tank and transmits the collected data to the PLC control program. The PLC control program sorts the hydrogen storage tanks according to their pressure values ​​and sends a pulse signal to the hydrogen storage cylinder group control program. Upon receiving the pulse signal, the hydrogen storage cylinder group control program controls the hydrogen filling electronic control valve to close, the hydrogen discharging electronic control valve to open, and the manual valve to open, allowing hydrogen to be released through the hydrogen refueling equipment.

7. The method for controlling the charging and discharging sequence of hydrogen storage cylinder groups in a hydrogen refueling station according to claim 1, characterized in that: A maintenance valve is installed on the pipeline of the pressure sensor.

8. The method for controlling the charging and discharging sequence of hydrogen storage cylinder groups in a hydrogen refueling station according to claim 1, characterized in that: The hardware of the PLC control program mainly includes: a logic controller CPU (PLC), digital input / output modules, analog input modules, and electrical components such as isolation safety barriers, surge protectors, relays, and matching low-voltage electrical appliances for signal isolation. The PLC control program is written using professional PLC program development software according to the provided control logic. After compilation, it is downloaded to the logic controller CPU, which is responsible for the entire automatic control process without human intervention. First, the pressure of several hydrogen storage tanks is converted into a 4mA to 20mA signal by the pressure sensor, and then enters the analog input module of the PLC control program after passing through the surge protector and the isolation safety barrier. Secondly, the logic controller CPU converts the 4mA to 20mA signal acquired by the analog input module into the actual pressure value of the hydrogen storage tank. Finally, the logic controller CPU automatically judges and processes according to the pre-written control program, and outputs a switch signal to the hydrogen storage cylinder group control program. The hydrogen storage cylinder group control program controls the opening and closing of the hydrogen filling electronic control valve and the hydrogen discharging electronic control valve on site.

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