A hydrogen-based charging pile power distribution system and method

Abstract

This application discloses a hydrogen-powered charging pile power distribution system and method. The system includes a municipal grid, which is electrically connected to the public power grid via a power supply branch. Several charging piles are connected to the public power grid. The municipal grid is electrically connected to a hydrogen energy storage and power generation unit via an inverter branch. The inverter branch is electrically connected to the power supply branch via a first switching branch. The hydrogen energy storage and power generation unit is electrically connected to an energy storage unit via a DC-DC converter branch. The energy storage unit is electrically connected to the inverter branch via a second switching branch. This application uses the municipal grid, hydrogen energy storage and power generation unit, and energy storage unit as power sources. Combining the electricity consumption habits of the municipal grid and the power consumption level of the charging piles, and utilizing the synergistic effect among the municipal grid, hydrogen energy storage and power generation unit, the system forms three power supply circuits, four energy storage circuits, and two grid-connected circuits, achieving organic unity of power supply, energy storage, and grid connection. This significantly improves the power distribution efficiency of charging piles and reduces redundant power losses in the lines.

Description

Technical Field

[0001] This invention relates to the technical field of power management for charging piles, and in particular to a power distribution system and method for charging piles based on hydrogen electricity. Background Technology

[0002] With the vigorous promotion of new energy vehicles, their market share in the passenger vehicle market has been increasing year by year. Most users considering new energy vehicle sales focus on battery range. Currently, efforts to improve battery range mainly focus on three areas: research and development of new battery materials, battery swapping, and fast charging. Research and development of new battery materials is time-consuming and difficult. Battery swapping technology suffers from incompatibility issues due to differences in vehicle models produced by different manufacturers. Fast charging technology remains the mainstream at present, and with the large-scale deployment and construction of charging infrastructure, the market share of new energy vehicles will further increase. However, most charging piles are currently connected to the municipal power grid. Especially for clustered charging piles, this can exacerbate the strain on the municipal power grid during peak hours. Dedicated power supply lines for charging piles are prone to energy waste due to the unpredictable timing of charging pile usage. Furthermore, dedicated power supply lines have long construction periods and high costs, and the power supply stability for charging piles using a single power supply method is poor. Summary of the Invention

[0003] To address the technical problems of current cluster-type charging piles having a single power supply method and irregular power consumption periods, which easily leads to redundant and wasted electrical energy, this invention proposes a charging pile power distribution system and method based on hydrogen electricity.

[0004] To solve the above problems, the technical solution of the present invention is implemented as follows:

[0005] This application discloses a hydrogen-electricity-based charging pile power distribution system, including a municipal grid. The municipal grid is electrically connected to the public power grid via a power supply branch. Several charging piles are connected to the public power grid. The municipal grid is electrically connected to a hydrogen energy storage and power generation unit via an inverter branch. The inverter branch is electrically connected to the power supply branch via a first switching branch. The hydrogen energy storage and power generation unit is electrically connected to an energy storage unit via a DC-DC converter branch. The energy storage unit is electrically connected to the inverter branch via a second switching branch. The power supply branch is electrically connected to a rectifier branch. The rectifier branch is electrically connected to the energy storage unit and the hydrogen energy storage and power generation unit via a third and a fourth switching branch, respectively. The inverter branch, the first switching branch, the power supply branch, the DC-DC converter branch, the second switching branch, the third switching branch, and the fourth switching branch are all electrically connected to a control host.

[0006] Preferably, the municipal grid, the power supply branch, and the public power grid form a first power supply circuit; the hydrogen storage power generation unit, the inverter branch, the first switching branch, the power supply branch, and the public power grid form a second power supply circuit; the energy storage unit, the second switching branch, the inverter branch, the power supply branch, and the public power grid form a third power supply circuit; the hydrogen storage power generation unit, the DC-DC converter branch, and the energy storage unit form a first energy storage circuit; the municipal grid, the power supply branch, the rectifier branch, the third switching branch, and the energy storage unit form a second energy storage circuit; the municipal grid, the power supply branch, the rectifier branch, the fourth switching branch, and the hydrogen storage power generation unit form a third energy storage circuit; the energy storage unit, the third switching branch, the fourth switching branch, and the hydrogen storage power generation unit form a fourth energy storage circuit; the hydrogen storage power generation unit, the inverter branch, and the municipal grid form a first grid-connected circuit; and the energy storage unit, the inverter branch, and the municipal grid form a second grid-connected circuit.

[0007] Preferably, the hydrogen storage and power generation unit includes a hydrogen production device and a fuel cell. The hydrogen production device is electrically connected to the fourth switching branch, and the fuel cell is electrically connected to the inverter branch and the DC-DC converter branch, respectively. The water inlet of the hydrogen production device is connected to a water tank, and the gas outlet of the hydrogen production device is connected to an air separation unit. The air separation unit is connected to a hydrogen storage tank and an oxygen storage tank, respectively. The hydrogen storage tank is connected to a booster, and the booster is connected to a liquid hydrogen transport vehicle and a refueling machine, respectively. The hydrogen inlet of the fuel cell is connected to the air separation unit and the hydrogen storage tank, respectively. The air inlet of the fuel cell is connected to the oxygen storage tank, and the drain outlet of the fuel cell is connected to the water tank.

[0008] Preferably, a first electric valve, a safety valve, and a first flow meter are installed on the pipeline between the air separation unit and the fuel cell; a second electric valve and a second flow meter are installed on the pipeline between the hydrogen storage tank and the fuel cell; and a third electric valve and a third flow meter are installed on the pipeline between the oxygen storage tank and the fuel cell. The first electric valve, the first flow meter, the second electric valve, the second flow meter, the third electric valve, and the third flow meter are all electrically connected to the control host.

[0009] Preferably, the inverter branch includes a DC / AC inverter module, a first disconnect switch, a first circuit breaker, and a first voltage regulator transformer. The input terminal of the DC / AC inverter module is electrically connected to the output terminal of the fuel cell. The output terminal of the DC / AC inverter module is electrically connected to the first disconnect switch. The first disconnect switch is electrically connected to the first circuit breaker. The first circuit breaker is electrically connected to the first voltage regulator transformer. The first voltage regulator transformer is connected to the mains grid via a step-up transformer and is electrically connected to the first switching branch. The DC-DC converter branch includes a DC / DC converter module, a second disconnect switch, a second circuit breaker, and a second voltage regulator transformer. The input terminal of the C / DC converter module is electrically connected to the output terminal of the fuel cell. The output terminal of the C / DC converter module is electrically connected to the second disconnect switch. The second disconnect switch is electrically connected to the second circuit breaker. The second circuit breaker is electrically connected to the second voltage regulator transformer. The second voltage regulator transformer is electrically connected to the energy storage unit. Both the first circuit breaker and the second circuit breaker are electrically connected to the control host. The rectifier branch includes an AC / DC rectifier module. The input terminal of the AC / DC rectifier module is electrically connected to the power supply branch. The output terminal of the AC / DC rectifier module is electrically connected to the third switching branch and the fourth switching branch, respectively.

[0010] Preferably, the first switching branch includes a third disconnecting switch and a third circuit breaker; the second switching branch includes a fourth disconnecting switch, a fourth circuit breaker, and a third voltage stabilizing transformer; the third switching branch includes a fifth disconnecting switch and a fifth circuit breaker; the fourth switching branch includes a sixth disconnecting switch and a sixth circuit breaker; and the power supply branch includes a step-down transformer, a fuse, a seventh disconnecting switch, and a seventh circuit breaker. The third, fourth, fifth, sixth, and seventh circuit breakers are all electrically connected to the control host.

[0011] Preferably, the energy storage unit includes an energy storage battery pack, on which a voltage monitoring component is installed, and the voltage monitoring component is electrically connected to the control host; a pressure transmitter is installed on the hydrogen storage tank, and the pressure transmitter is electrically connected to the control host; a voltage monitoring sensor and a current monitoring sensor are respectively installed on the public power grid, and both the voltage monitoring sensor and the current monitoring sensor are electrically connected to the control host.

[0012] This application also discloses a method for power distribution in a hydrogen-powered charging pile, comprising the following steps:

[0013] S1. Obtain the power consumption parameters of the public power grid and determine the power consumption level of the charging pile;

[0014] S2. Determine the power consumption status of the municipal grid based on the peak and valley power consumption data of the municipal grid and the power consumption time of the charging piles;

[0015] S3. Based on the city's power grid usage status and the charging pile's power consumption level, plan the public power grid supply lines, energy storage lines, and / or grid connection lines;

[0016] S4. Determine the status of energy storage lines and / or grid-connected lines based on changes in the power supply status of public power grid lines;

[0017] S5. Repeat steps S1-S3 to dynamically adjust the power supply lines, energy storage lines, and / or grid connection lines of the public power grid.

[0018] Preferably, determining the power consumption level of the charging pile includes: first, determining the rated power consumption P0 of the public power grid when the charging pile is used at full load; and then calculating the real-time power consumption P based on the obtained real-time voltage and current values ​​of the public power grid. i When P i When ≤0.3P0, the power consumption level of the charging pile is set to idle power supply A; when 0.3P0 < P i When ≤0.7P0, the power consumption level of the charging pile is set to general power supply A+; when 0.7P0 < P i When P0 is less than or equal to 0, the power supply level of the charging pile is set to dangerous power supply A++.

[0019] Preferably, the planning method for public power grid supply lines, energy storage lines, and / or grid-connected lines in step S3 includes the following steps:

[0020] S31. First, determine whether the power consumption status of the municipal grid is peak power consumption status or valley power consumption status.

[0021] S32. When the power consumption status of the municipal grid is in a low-end state, the municipal grid, as the power source, shall give priority to supplying power to the public power grid.

[0022] S33. When the power consumption level of the charging pile is idle power supply A, the municipal grid serves as the power supply source to both the hydrogen energy storage and power generation unit and the energy storage unit for energy storage.

[0023] S34. When the power consumption level of the charging pile is general power supply A+, the energy storage priority of the hydrogen storage power generation unit and the energy storage unit is determined according to the energy storage status of the hydrogen storage power generation unit and the energy storage unit. When the energy storage status of the hydrogen storage power generation unit or the energy storage unit is lower than the lower limit of the safety threshold, the municipal grid acts as a power source to supply energy to the hydrogen storage power generation unit or the energy storage unit. When the energy storage status of both the hydrogen storage power generation unit and the energy storage unit is lower than the lower limit of the safety threshold at the same time, the municipal grid acts as a power source to supply energy to the hydrogen storage power generation unit with priority.

[0024] S35. When the power consumption level of the charging pile is dangerous power supply A++, the municipal power grid, as the power supply source, only supplies power to the public power grid.

[0025] S36. When the city grid is in peak power consumption mode, the city grid does not act as a power source, and the hydrogen storage power generation unit and / or energy storage unit act as a power source to supply power to the public grid and / or supply power to the city grid.

[0026] S37. When the power consumption level of the charging pile is idle power supply A, the hydrogen storage power generation unit or energy storage unit serves as a power supply to supply power to the public power grid and / or the municipal grid.

[0027] S38. When the hydrogen energy storage power generation unit is used as a power source, the hydrogen energy storage power generation unit supplies power to the public power grid, the energy storage unit supplies energy storage and / or the municipal grid supplies power.

[0028] S39. When the energy storage unit is used as a power source, the energy storage unit supplies power to the public power grid and / or supplies power to the municipal grid.

[0029] S40. When the power consumption level of the charging pile is general power supply A+, the hydrogen storage power generation unit or energy storage unit supplies power to the public power grid as a power source.

[0030] S41. When the power consumption level of the charging pile is dangerous power supply A++, the hydrogen storage power generation unit and the energy storage unit supply power to the public power grid as power sources.

[0031] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0032] This application uses the municipal grid, hydrogen energy storage power generation and energy storage unit as the power supply. Combining the electricity consumption habits of the municipal grid and the power consumption level of the charging pile, it utilizes the synergistic effect between the municipal grid, hydrogen energy storage power generation and energy storage unit to form three power supply circuits, four energy storage circuits and two grid connection circuits. This achieves the organic unity of power supply, energy storage and grid connection, greatly improves the power distribution efficiency of charging piles and reduces the power loss of redundant lines.

[0033] This application integrates hydrogen production equipment and fuel cells into a hydrogen storage and power generation unit, achieving integrated power generation and hydrogen storage. Redundant electrical energy from the grid can be converted into hydrogen through the hydrogen production equipment. The hydrogen is then pressurized and processed into liquid hydrogen, which is convenient for storage and transportation and can be used for hydrogen refueling operations of hydrogen-powered vehicles. At the same time, by monitoring the pressure of the hydrogen storage tank in real time, it is ensured that the amount of hydrogen required by the hydrogen fuel cell can meet the normal power generation, greatly improving the power generation reliability of the hydrogen storage and power generation unit. Attached Figure Description

[0034] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0035] Figure 1 This is a diagram of the allocation system architecture in this invention.

[0036] Figure 2 This is a flowchart of the allocation method in this invention. Detailed Implementation

[0037] 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. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] Example 1

[0039] like Figure 1 As shown in the illustration, this application discloses a hydrogen-electric charging pile power distribution system, including a municipal power grid. The municipal power grid is electrically connected to the public power grid via a power supply branch. Several charging piles are connected to the public power grid, and each charging pile is connected to the public power grid via a circuit breaker. The municipal power grid, the power supply branch, and the public power grid form a first power supply circuit. In other words, the first power supply circuit, consisting of the municipal power grid, the power supply branch, and the public power grid, supplies power to the charging piles. During off-peak hours of municipal power consumption, the first power supply circuit can serve as the main power supply circuit for supplying power to the charging piles.

[0040] The municipal power grid is electrically connected to the hydrogen storage and power generation unit via an inverter branch. The hydrogen storage and power generation unit, the inverter branch, and the municipal power grid form a first grid-connected circuit. The inverter branch is electrically connected to the power supply branch via a first switching branch. The hydrogen storage and power generation unit, the inverter branch, the first switching branch, the power supply branch, and the public power grid form a second power supply circuit. In other words, the hydrogen storage and power generation unit can generate electricity for grid connection, and can also supply power to the public power grid via the switching branch and the power supply branch, thereby supplying power to charging piles. In other words, during peak electricity consumption periods, the hydrogen storage and power generation unit can simultaneously supply power to the municipal power grid and charging piles, ensuring the stability of power supply to charging piles while reducing the pressure on the municipal power grid.

[0041] The hydrogen energy storage and power generation unit is electrically connected to the energy storage unit via a DC-DC converter branch. The hydrogen energy storage and power generation unit, the DC-DC converter branch, and the energy storage unit form a first energy storage circuit. The energy storage unit is electrically connected to the inverter branch via a second switching branch. The energy storage unit, the second switching branch, the inverter branch, the power supply branch, and the public power grid form a third power supply circuit. The energy storage unit, the inverter branch, and the municipal grid form a second grid-connected circuit. In other words, when the charging pile's electricity consumption is low and during peak municipal grid electricity consumption periods, the redundant electrical energy generated by the hydrogen energy storage and power generation unit can be stored in the energy storage unit. When the hydrogen storage content of the hydrogen energy storage and power generation unit is lower than the lower limit of the safety threshold, the energy storage unit can be switched to supply power to the public power grid and the municipal grid, ensuring the reliability of the charging pile's power supply while reducing the pressure on the municipal grid.

[0042] The power supply branch is electrically connected to the rectifier branch, and the rectifier branch is electrically connected to the energy storage unit and the hydrogen energy storage and power generation unit through the third switching branch and the fourth switching branch, respectively; the municipal grid, the power supply branch, the rectifier branch, the third switching branch, and the energy storage unit form a second energy storage circuit; the municipal grid, the power supply branch, the rectifier branch, the fourth switching branch, and the hydrogen energy storage and power generation unit form a third energy storage circuit; the energy storage unit, the third switching branch, the fourth switching branch, and the hydrogen energy storage and power generation unit form a fourth energy storage circuit; the inverter branch, the first switching branch, the power supply branch, the DC-DC converter branch, the second switching branch, the third switching branch, and the fourth switching branch are all electrically connected to the main control unit. In other words, during off-peak hours of the municipal power grid, redundant electricity can be converted into hydrogen storage, stored in energy storage units, and supplied to the public power grid, thus fully absorbing redundant electricity and reducing waste. At the same time, during peak hours of the municipal power grid, and while ensuring that the hydrogen storage content in the power generation unit is below the lower limit of the safety threshold and that the normal refueling of hydrogen fuel cell vehicles is guaranteed, hydrogen can be produced by supplying electricity to the hydrogen storage power generation unit through the energy storage unit, thereby keeping the hydrogen storage content in the hydrogen storage power generation unit within the safety threshold.

[0043] Specifically, the hydrogen storage and power generation unit includes a hydrogen production device and a fuel cell. The hydrogen production device is electrically connected to the fourth switching branch, and the fuel cell is electrically connected to both the inverter branch and the DC-DC converter branch. The inlet of the hydrogen production device is connected to a water tank, and the outlet is connected to an air separation unit. The air separation unit is connected to both a hydrogen storage tank and an oxygen storage tank. The hydrogen storage tank is connected to a booster, and the booster is connected to both a liquid hydrogen transport vehicle and a refueling machine. The hydrogen inlet of the fuel cell is connected to both the air separation unit and the hydrogen storage tank, the air inlet is connected to the oxygen storage tank, and the outlet is connected to the water tank. In other words, the hydrogen production device and the hydrogen fuel cell achieve a cyclical conversion between chemical energy and electrical energy, absorbing redundant electrical energy from the grid or supplying power to the grid.

[0044] In some embodiments, a first electric valve, a safety valve, and a first flow meter are installed on the pipeline between the air separation unit and the fuel cell; a second electric valve and a second flow meter are installed on the pipeline between the hydrogen storage tank and the fuel cell; and a third electric valve and a third flow meter are installed on the pipeline between the oxygen storage tank and the fuel cell. All three components—the first electric valve, the first flow meter, the second electric valve, the second flow meter, the third electric valve, and the third flow meter—are electrically connected to the control host. In other words, the air separation unit separates the hydrogen and oxygen produced during the hydrogen production stage and stores them separately in the hydrogen storage tank and the oxygen storage tank, respectively, to facilitate efficient storage of hydrogen and oxygen for subsequent hydrogen fuel cell power generation.

[0045] The inverter branch includes a DC / AC inverter module, a first disconnect switch, a first circuit breaker, and a first voltage regulator transformer. The input terminal of the DC / AC inverter module is electrically connected to the output terminal of the fuel cell. The output terminal of the DC / AC inverter module is electrically connected to the first disconnect switch. The first disconnect switch is electrically connected to the first circuit breaker. The first circuit breaker is electrically connected to the first voltage regulator transformer. The first voltage regulator transformer is connected to the mains grid via a step-up transformer and is electrically connected to the first switching branch. The DC-DC converter branch includes a DC / DC converter module, a second disconnect switch, a second circuit breaker, and a second voltage regulator transformer. The input terminal of the DC-DC converter module is electrically connected to the output terminal of the fuel cell. The output terminal of the DC / DC converter module is electrically connected to the second isolating switch. The second isolating switch is electrically connected to the second circuit breaker. The second circuit breaker is electrically connected to the second voltage regulator transformer. The second voltage regulator transformer is electrically connected to the energy storage unit. Both the first and second circuit breakers are electrically connected to the control host. The rectifier branch includes an AC / DC rectifier module. The input terminal of the AC / DC rectifier module is electrically connected to the power supply branch. The output terminal of the AC / DC rectifier module is electrically connected to the third and fourth switching branches, respectively. In other words, by controlling the on / off state of the circuit breakers in the inverter and rectifier branches through the control terminal, the power supply status of each power source for the hydrogen energy storage and power generation unit and the energy storage unit can be controlled.

[0046] The first switching branch includes a third disconnecting switch and a third circuit breaker; the second switching branch includes a fourth disconnecting switch, a fourth circuit breaker, and a third voltage stabilizing transformer; the third switching branch includes a fifth disconnecting switch and a fifth circuit breaker; the fourth switching branch includes a sixth disconnecting switch and a sixth circuit breaker; and the power supply branch includes a step-down transformer, a fuse, a seventh disconnecting switch, and a seventh circuit breaker. The third, fourth, fifth, sixth, and seventh circuit breakers are all electrically connected to the main control unit. In other words, by controlling the on / off state of each circuit breaker in the first, second, third, and fourth switching branches through the control terminal, the overall power supply, energy storage, and grid-connected power generation status can be adjusted.

[0047] In some embodiments, the energy storage unit includes an energy storage battery pack, on which a voltage monitoring component is installed, electrically connected to the control host; a pressure transmitter is installed on the hydrogen storage tank, electrically connected to the control host; a voltage monitoring sensor and a current monitoring sensor are respectively installed on the public power grid, both electrically connected to the control host. In other words, state monitoring components are installed on the energy storage unit, the public power grid, and the hydrogen storage and power generation unit, respectively, enabling real-time monitoring of state changes in these components. This facilitates rapid adjustment of the overall power supply, energy storage, and grid-connected power generation status, ensuring the safety and reliability of the overall power supply, energy storage, and grid-connected power generation.

[0048] Example 2

[0049] like Figure 2 As shown, this application also discloses a method for power distribution in a hydrogen-powered charging pile, comprising the following steps:

[0050] S1. Obtain the power consumption parameters of the public power grid and determine the power consumption level of the charging pile. The determination of the power consumption level of the charging pile includes: first, determining the rated power consumption P0 of the public power grid when the charging pile is used at full load; and then, based on the obtained real-time voltage and current values ​​of the public power grid, calculating the real-time power consumption P. i When P i When ≤0.3P0, the power consumption level of the charging pile is set to idle power supply A; when 0.3P0 < P i When ≤0.7P0, the power consumption level of the charging pile is set to general power supply A+; when 0.7P0 < P i When P0 is less than or equal to 0, the power supply level of the charging pile is set to dangerous power supply A++.

[0051] S2. Based on the peak and valley periods of the municipal power grid and the electricity consumption periods of charging piles, determine the status of the municipal power grid and determine whether the municipal power grid is in a peak or valley period by using the electricity consumption periods of charging piles.

[0052] S3. Based on the city's power grid usage status and the charging pile's power consumption level, plan the public power grid supply lines, energy storage lines, and / or grid-connected lines. The planning method for public power grid supply lines, energy storage lines, and / or grid-connected lines includes the following steps:

[0053] S31. First, determine whether the power consumption status of the municipal grid is peak or off-peak; that is, determine whether the municipal grid is in a peak or off-peak period of power consumption based on the usage time of the charging pile.

[0054] S32. When the power consumption status of the municipal grid is in a low-end state, the municipal grid, as the power source, shall give priority to supplying power to the public power grid.

[0055] S33. When the power consumption level of the charging pile is idle power supply A, the municipal grid serves as the power supply source to both the hydrogen energy storage and power generation unit and the energy storage unit for energy storage.

[0056] S34. When the power consumption level of the charging pile is general power supply A+, the energy storage priority of the hydrogen storage power generation unit and the energy storage unit is determined according to their energy storage status. When the energy storage status of the hydrogen storage power generation unit or the energy storage unit is lower than the lower limit of the safety threshold, the municipal grid acts as a power source to supply energy to the hydrogen storage power generation unit or the energy storage unit. When the energy storage status of both the hydrogen storage power generation unit and the energy storage unit is lower than the lower limit of the safety threshold, the municipal grid acts as a power source to supply energy to the hydrogen storage power generation unit with priority. It should be noted that in this embodiment, the safe threshold for hydrogen content is 40% to 70% of the rated hydrogen content, and the safe threshold for energy storage voltage in the energy storage unit is 40% to 70% of the rated energy storage voltage.

[0057] S35. When the power consumption level of the charging pile is dangerous power supply A++, the municipal power grid, as the power supply source, only supplies power to the public power grid.

[0058] S36. When the city grid is in peak power consumption mode, the city grid does not act as a power source, and the hydrogen storage power generation unit and / or energy storage unit act as a power source to supply power to the public grid and / or supply power to the city grid.

[0059] S37. When the power consumption level of the charging pile is idle power supply A, the hydrogen storage power generation unit or energy storage unit serves as a power supply to supply power to the public power grid and / or the municipal grid.

[0060] S38. When the hydrogen energy storage power generation unit is used as a power source, the hydrogen energy storage power generation unit supplies power to the public power grid, the energy storage unit supplies energy storage and / or the municipal grid supplies power.

[0061] S39. When the energy storage unit is used as a power source, the energy storage unit supplies power to the public power grid and / or supplies power to the municipal grid.

[0062] S40. When the power consumption level of the charging pile is general power supply A+, the hydrogen storage power generation unit or energy storage unit supplies power to the public power grid as a power source.

[0063] S41. When the power consumption level of the charging pile is dangerous power supply A++, the hydrogen storage power generation unit and the energy storage unit supply power to the public power grid as power sources.

[0064] S4. Determine the status of energy storage lines and / or grid-connected lines based on changes in the power supply status of public power grid lines; that is, when the hydrogen energy storage power generation unit or energy storage unit is used as a power supply for the public power grid, based on real-time monitoring of changes in hydrogen storage content in the hydrogen energy storage power generation unit or changes in energy storage voltage in the energy storage unit, when the hydrogen storage content or energy storage voltage threshold is lower than the safety threshold, stop the hydrogen energy storage power generation unit or energy storage unit from storing energy and / or from connecting to the grid for power supply.

[0065] S5. Repeat steps S1-S3 to dynamically adjust the power supply lines, energy storage lines, and / or grid-connected lines of the public power grid. That is, based on changes in the system's power supply status, when the power consumption of the municipal grid changes from peak to off-peak periods, or based on real-time monitoring of changes in hydrogen storage content in the hydrogen energy storage unit or changes in energy storage voltage in the energy storage unit, the power supply lines, energy storage lines, and / or grid-connected lines can be dynamically adjusted according to the control strategy in step S3.

[0066] This specific embodiment is merely an explanation of the present invention and is not intended to limit the invention. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. A method for power distribution in a charging pile based on hydrogen electricity, characterized in that, The system includes a hydrogen-electric charging pile power distribution system. The distribution system comprises a municipal grid, which is electrically connected to a public power grid via a power supply branch. Several charging piles are connected to the public power grid. The municipal grid is electrically connected to a hydrogen energy storage and power generation unit via an inverter branch. The inverter branch is electrically connected to the power supply branch via a first switching branch. The hydrogen energy storage and power generation unit is electrically connected to an energy storage unit via a DC-DC converter branch. The energy storage unit is electrically connected to the inverter branch via a second switching branch. The power supply branch is electrically connected to a rectifier branch. The rectifier branch is electrically connected to the energy storage unit and the hydrogen energy storage and power generation unit via third and fourth switching branches, respectively. The inverter branch, the first switching branch, the power supply branch, the DC-DC converter branch, the second switching branch, the third switching branch, and the fourth switching branch are all electrically connected to a control unit. It also includes the following steps: S1. Obtain the power consumption parameters of the public power grid and determine the power consumption level of the charging pile; S2. Determine the power consumption status of the municipal grid based on the peak and valley power consumption data of the municipal grid and the power consumption time of the charging piles; S3. Based on the city's power grid usage status and the charging pile's power consumption level, plan the public power grid supply lines, energy storage lines, and / or grid connection lines; S4. Determine the status of energy storage lines and / or grid-connected lines based on changes in the power supply status of public power grid lines; S5. Repeat steps S1-S3 to dynamically adjust the power supply lines, energy storage lines and / or grid connection lines of the public power grid. The planning method for public power grid supply lines, energy storage lines, and / or grid-connected lines in step S3 includes the following steps: S31. First, determine whether the power consumption status of the municipal grid is peak power consumption status or valley power consumption status. S32. When the power consumption status of the municipal grid is in a low-end state, the municipal grid, as the power source, shall give priority to supplying power to the public power grid. S33. When the power consumption level of the charging pile is idle power supply A, the municipal grid serves as the power supply source to both the hydrogen energy storage and power generation unit and the energy storage unit for energy storage. S34. When the power consumption level of the charging pile is general power supply A+, the energy storage priority of the hydrogen storage power generation unit and the energy storage unit is determined according to the energy storage status of the hydrogen storage power generation unit and the energy storage unit. When the energy storage status of the hydrogen storage power generation unit or the energy storage unit is lower than the lower limit of the safety threshold, the municipal grid acts as a power source to supply energy to the hydrogen storage power generation unit or the energy storage unit. When the energy storage status of both the hydrogen storage power generation unit and the energy storage unit is lower than the lower limit of the safety threshold at the same time, the municipal grid acts as a power source to supply energy to the hydrogen storage power generation unit with priority. S35. When the power consumption level of the charging pile is dangerous power supply A++, the municipal power grid, as the power supply source, only supplies power to the public power grid. S36. When the city grid is in peak power consumption mode, the city grid does not act as a power source, and the hydrogen storage power generation unit and / or energy storage unit act as a power source to supply power to the public grid and / or supply power to the city grid. S37. When the power consumption level of the charging pile is idle power supply A, the hydrogen storage power generation unit or energy storage unit serves as a power supply to supply power to the public power grid and / or the municipal grid. S38. When the hydrogen energy storage power generation unit is used as a power source, the hydrogen energy storage power generation unit supplies power to the public power grid, the energy storage unit supplies energy storage and / or the municipal grid supplies power. S39. When the energy storage unit is used as a power source, the energy storage unit supplies power to the public power grid and / or supplies power to the municipal grid. S40. When the power consumption level of the charging pile is general power supply A+, the hydrogen storage power generation unit or energy storage unit supplies power to the public power grid as a power source. S41. When the power consumption level of the charging pile is dangerous power supply A++, the hydrogen storage power generation unit and the energy storage unit supply power to the public power grid as power sources.

2. The energy distribution method for charging piles based on hydrogen electricity as described in claim 1, characterized in that, The determination of the power consumption level of the charging pile includes: first, determining the rated power consumption P0 of the public power grid when the charging pile is used at full load; and then calculating the real-time power consumption P based on the obtained real-time voltage and current values ​​of the public power grid. i When P i When ≤0.3P0, the power consumption level of the charging pile is set to idle power supply A; when 0.3P0 < P i When ≤0.7P0, the power consumption level of the charging pile is set to general power supply A+; when 0.7P0 < P i When P0 is less than or equal to 0, the power supply level of the charging pile is set to dangerous power supply A++.

3. The energy distribution method for charging piles based on hydrogen electricity as described in claim 1, characterized in that, The municipal grid, the power supply branch, and the public power grid form a first power supply circuit; the hydrogen storage power generation unit, the inverter branch, the first switching branch, the power supply branch, and the public power grid form a second power supply circuit; the energy storage unit, the second switching branch, the inverter branch, the power supply branch, and the public power grid form a third power supply circuit; the hydrogen storage power generation unit, the DC-DC converter branch, and the energy storage unit form a first energy storage circuit; the municipal grid, the power supply branch, the rectifier branch, the third switching branch, and the energy storage unit form a second energy storage circuit; the municipal grid, the power supply branch, the rectifier branch, the fourth switching branch, and the hydrogen storage power generation unit form a third energy storage circuit; the energy storage unit, the third switching branch, the fourth switching branch, and the hydrogen storage power generation unit form a fourth energy storage circuit; the hydrogen storage power generation unit, the inverter branch, and the municipal grid form a first grid-connected circuit; the energy storage unit, the inverter branch, and the municipal grid form a second grid-connected circuit.

4. The energy distribution method for charging piles based on hydrogen electricity as described in claim 1, characterized in that, The hydrogen storage and power generation unit includes a hydrogen production device and a fuel cell. The hydrogen production device is electrically connected to the fourth switching branch, and the fuel cell is electrically connected to the inverter branch and the DC-DC converter branch. The water inlet of the hydrogen production device is connected to a water tank, and the gas outlet of the hydrogen production device is connected to an air separation unit. The air separation unit is connected to a hydrogen storage tank and an oxygen storage tank. The hydrogen storage tank is connected to a booster, and the booster is connected to a liquid hydrogen transport vehicle and a refueling machine. The hydrogen inlet of the fuel cell is connected to the air separation unit and the hydrogen storage tank, the air inlet of the fuel cell is connected to the oxygen storage tank, and the drain outlet of the fuel cell is connected to the water tank.

5. The energy distribution method for charging piles based on hydrogen electricity as described in claim 4, characterized in that, A first electric valve, a safety valve, and a first flow meter are installed on the pipeline between the air separation unit and the fuel cell. A second electric valve and a second flow meter are installed on the pipeline between the hydrogen storage tank and the fuel cell. A third electric valve and a third flow meter are installed on the pipeline between the oxygen storage tank and the fuel cell. The first electric valve, the first flow meter, the second electric valve, the second flow meter, the third electric valve, and the third flow meter are all electrically connected to the control host.

6. The energy distribution method for charging piles based on hydrogen electricity as described in claim 4, characterized in that, The inverter branch includes a DC / AC inverter module, a first disconnect switch, a first circuit breaker, and a first voltage regulator transformer. The input terminal of the DC / AC inverter module is electrically connected to the output terminal of the fuel cell. The output terminal of the DC / AC inverter module is electrically connected to the first disconnect switch. The first disconnect switch is electrically connected to the first circuit breaker. The first circuit breaker is electrically connected to the first voltage regulator transformer. The first voltage regulator transformer is connected to the mains grid via a step-up transformer and is electrically connected to the first switching branch. The DC-DC converter branch includes a DC / DC converter module, a second disconnect switch, a second circuit breaker, and a second voltage regulator transformer. The input terminal of the DC-DC converter module is electrically connected to the output terminal of the fuel cell. The output terminal of the DC / DC converter module is electrically connected to the second disconnect switch. The second disconnect switch is electrically connected to the second circuit breaker. The second circuit breaker is electrically connected to the second voltage regulator transformer. The second voltage regulator transformer is electrically connected to the energy storage unit. Both the first circuit breaker and the second circuit breaker are electrically connected to the control host. The rectifier branch includes an AC / DC rectifier module. The input terminal of the AC / DC rectifier module is electrically connected to the power supply branch. The output terminal of the AC / DC rectifier module is electrically connected to the third switching branch and the fourth switching branch, respectively.

7. The energy distribution method for charging piles based on hydrogen electricity as described in claim 6, characterized in that, The first switching branch includes a third disconnecting switch and a third circuit breaker; the second switching branch includes a fourth disconnecting switch, a fourth circuit breaker, and a third voltage stabilizing transformer; the third switching branch includes a fifth disconnecting switch and a fifth circuit breaker; the fourth switching branch includes a sixth disconnecting switch and a sixth circuit breaker; and the power supply branch includes a step-down transformer, a fuse, a seventh disconnecting switch, and a seventh circuit breaker. The third, fourth, fifth, sixth, and seventh circuit breakers are all electrically connected to the control host.

8. The energy distribution method for charging piles based on hydrogen electricity as described in claim 4, characterized in that, The energy storage unit includes an energy storage battery pack, on which a voltage monitoring component is installed, and the voltage monitoring component is electrically connected to the control host; the hydrogen storage tank is equipped with a pressure transmitter, which is electrically connected to the control host; the public power grid is equipped with a voltage monitoring sensor and a current monitoring sensor, both of which are electrically connected to the control host.

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