A mobile two-way power supply system that links power between ships and land

Abstract

The present invention relates to a mobile bidirectional power supply system that links power between a ship and land, enabling power to be supplied to a docked ship while moving on land or to recover power from a ship and supply power to another ship or land. The system comprises a ship energy storage device installed on a ship that stores generated power and discharges the stored power, stores power supplied from land via a power cable, and discharges the stored power to a mobile power supply device; a mobile power supply device that moves toward a docked ship and, in conjunction with the ship energy storage device, supplies land power to the ship or recovers power stored on the ship. The mobile power supply device includes a power supply cable device that winds or unwinds a charging cable for power supply, and a land energy storage device that stores power to supply charging power to the ship or stores power recovered from the ship, thereby implementing a mobile bidirectional power supply system that links power between a ship and land.

Description

Technology Field

[0001] The present invention relates to a mobile bidirectional power supply system that links power between a ship and land, and more specifically, to a mobile bidirectional power supply system that links power between a ship and land, capable of supplying power to an anchored ship while moving on land, or recovering power from a ship to supply power to another ship or land. Background Technology

[0002] When a ship is anchored at a berth such as a port, to produce the electricity required on board, the ship may use its own installed generator or receive power from the shore by connecting to the shore-side power grid.

[0003] Using a ship's own generator here presents problems, such as causing environmental pollution by emitting harmful gases like methane and generating noise. For this reason, ships at anchor prefer to receive power from the shore power grid.

[0004] The vessel may be an electric vessel comprising a rechargeable battery system and an electric propulsion system powered by the rechargeable battery system. The vessel may be a conventional internal combustion engine vessel, and instead of using the vessel's auxiliary generator to produce the electricity required when the vessel is anchored, the vessel may be connected to a shore-side power supply network.

[0005] In order for a ship to connect to the onshore power supply network, the ship must move to the location of a fixedly mounted power supply unit on land.

[0006] Therefore, if there are multiple vessels receiving shore power, a vessel for charging moves to the shore power supply unit to charge, and once charging is complete, moves to another location, and then another vessel for charging moves to the shore power supply unit to proceed with charging.

[0007] Consequently, when there are multiple vessels receiving onshore power, there is the inconvenience of having to move the vessels, and this movement leads to the problem of extended charging times.

[0008] Therefore, even if there are multiple vessels receiving shore power, technology is required that enables vessels to easily receive shore power without moving from their current anchored location. Prior art literature

[0009] Republic of Korea Registered Patent 10-2338125 (Registered Dec. 07, 2021) (DC-based power supply system for ships capable of linking with shore AC power) Republic of Korea Published Patent 10-2024-0033921 ​​(March 13, 2024) (Power supply system and method for ships linked with shore power) Republic of Korea Published Patent 10-2024-0061222 (Published May 08, 2024) (DC-based power supply method and system for ships capable of linking with shore power) Republic of Korea Registered Patent 10-2420885 (Registered July 11, 2022) (Power system for supplying electrical energy to ships) The problem to be solved

[0010] Therefore, the present invention is proposed to solve the problems of ship movement and prolonged ship charging time that occur in the method of supplying land-based power to a conventional ship as described above, and aims to provide a mobile bidirectional power supply system that links land-based power with a ship capable of supplying power to an anchored ship while moving on land.

[0011] Another objective of the present invention is to provide a mobile bidirectional power supply system that links power between a ship and land, enabling the recovery of power from the ship to supply power to other ships or land. means of solving the problem

[0012] In order to achieve the above-mentioned purpose, the "mobile bidirectional power supply system for linking power between a ship and land" according to the present invention is,

[0013] A ship energy storage device installed on a ship that stores generated power and discharges stored power, stores power supplied from land via a power cable, and discharges the stored power to a mobile power supply unit;

[0014] It includes a mobile power supply device that moves toward the anchored vessel and supplies shore power to the vessel in conjunction with the vessel energy storage device, or recovers power stored in the vessel.

[0015] The above-mentioned mobile power supply is,

[0016] A power supply cable device for winding or unwinding a charging cable for power supply;

[0017] It is characterized by including a land-based energy storage device that stores power to supply charging power to a vessel or stores power recovered from said vessel.

[0018] Preferably, the above-ground energy storage device is,

[0019] Power control unit (PCS) that performs power charging and supply;

[0020] An energy bank that charges power supplied by the power control unit above and supplies power by discharging the charged power;

[0021] It is characterized by including a power management unit (PMS) that manages power through a process of controlling charging and discharging, linked with the power control unit and energy bank.

[0022] Preferably, the power control unit is,

[0023] An AC-DC converter that converts AC power supplied from the ground (Grid) into DC power;

[0024] A DC-DC converter that converts the DC power converted by the above AC-DC converter into DC to match the capacity of the lithium battery to charge the lithium battery, or converts the power charged in the above lithium battery into DC to discharge it;

[0025] It is characterized by including a controller that controls the operation of the above AC-DC converter and DC-DC converter.

[0026] Preferably, the DC-DC converter is,

[0027] It is characterized by converting surplus power output from the ship into direct current to match the capacity of the lithium battery to charge the lithium battery, or converting power charged in the lithium battery into direct current to discharge it.

[0028] Preferably, the mobile power supply unit is,

[0029] Movement control unit for moving a mobile power supply unit;

[0030] It is characterized by having a bidirectional charging unit that is linked to the above-mentioned land energy storage device and the movement control unit, and supplies power to the above-mentioned ship energy storage device or recovers the charging power of the above-mentioned ship energy storage device.

[0031] Preferably, the bidirectional charging unit is,

[0032] A power conversion unit that converts power supplied from the above-mentioned ground energy storage device into power corresponding to the load;

[0033] A charger that supplies power converted by the above power conversion unit to a ship energy storage device or a vehicle charging unit;

[0034] It is characterized by including a main controller that is connected via communication to the above-mentioned land energy storage device and ship energy storage device, monitors the energy status of each energy storage device, and controls the charging and discharging of the land energy storage device and ship energy storage device based on the monitoring results.

[0035] Preferably, the ship energy storage device is,

[0036] Power control unit (PCS) that performs power charging and supply;

[0037] An energy bank that charges power supplied by the power control unit above and supplies power by discharging the charged power;

[0038] It is characterized by including a power management unit (PMS) that manages power through a process of controlling charging and discharging, linked with the power control unit and energy bank. Effects of the invention

[0039] According to the present invention, there is an effect of conveniently supplying power to a docked vessel while moving on land, and accordingly, the vessel can conveniently receive power without moving from its docked position.

[0040] In addition, according to the present invention, there is an effect of moving to the location where the vessel is anchored, recovering the vessel's power, and supplying charging power to an electric vehicle or another vessel. Brief explanation of the drawing

[0041] FIG. 1 is a schematic diagram of a mobile bidirectional power supply system that links power between a ship and land according to the present invention, and FIG. 2 is a block diagram of an exemplary embodiment of a mobile bidirectional power supply system that links power between a ship and land according to the present invention, and FIG. 3 is a circuit diagram of a mobile bidirectional power supply system that links power between a ship and land according to the present invention, and FIG. 4 is a cross-sectional view of an exemplary embodiment of a power supply cable device applied to the present invention. Specific details for implementing the invention

[0042] A mobile bidirectional power supply system that links power between a ship and land according to a preferred embodiment of the present invention will be described in detail below with reference to the attached drawings.

[0043] The terms or words used in the present invention described below should not be interpreted as being limited to their ordinary or dictionary meanings, but should be interpreted in a meaning and concept consistent with the technical spirit of the present invention, based on the principle that the inventor can appropriately define the concept of the terms to best describe his invention.

[0044] Therefore, the embodiments described in this specification and the configurations illustrated in the drawings are merely preferred embodiments of the present invention and do not represent all technical concepts of the present invention; thus, it should be understood that various equivalents and modifications that can replace them may exist at the time of filing this application.

[0045] FIG. 1 is a configuration diagram of a mobile bidirectional power supply system that links power between a ship and land according to a preferred embodiment of the present invention, FIG. 2 is a block configuration diagram of an embodiment of a mobile bidirectional power supply system that links power between a ship and land according to the present invention, and FIG. 3 is a circuit diagram of a mobile bidirectional power supply system that links power between a ship and land according to the present invention.

[0046] The mobile bidirectional power supply system for linking power between a ship and land according to the present invention may include a ship (100, 400), a mobile power supply device (200), a grid (300), and an electric vehicle (500).

[0047] The ship (100, 400) generates electricity by using waste heat with a waste heat generator equipped inside, and stores the generated electricity in the ship energy storage device (110).

[0048] The ship energy storage device (110) is installed on the ship (100) and stores power generated from a waste heat generator and discharges the stored power, stores power supplied from land through a power cable, and discharges the stored power to a mobile power supply device (200).

[0049] The ship energy storage device (110) may include a power control unit (PCS) (111) that performs power charging and supply, an energy bank (112) that charges power supplied by the power control unit (111) and discharges the charged power to supply power, and a power management unit (PMS) (113) that manages power through a process of controlling charging and discharging in conjunction with the power control unit (111) and the energy bank (112).

[0050] The power control unit (111) may include a first DC-DC converter (111a) that receives DC power supplied from land and converts it into a predetermined DC power, or converts power charged in a lithium battery (LiB), which is an energy bank (112), into a predetermined DC power and supplies it to a mobile power supply device (200); a second DC-DC converter (111b) that converts the DC power converted by the first DC-DC converter (111a) into DC to match the capacity of the energy bank (112) and charges the lithium battery, or converts the power charged in the lithium battery into DC and discharges it to the first DC-DC converter (111a); and a controller (111c) that controls the operation of the first and second DC-DC converters (111) (112).

[0051] The mobile power supply device (200) moves toward the anchored vessel (100) using a means of transportation and, in conjunction with the vessel energy storage device (110), supplies land power to the vessel (100) or recovers power stored in the vessel (100).

[0052] Here, the means of movement may utilize a means of movement equipped on a conventional trolley or vehicle, and may basically be implemented by including means such as a moving wheel, a power means, a power transmission means, a handle, and a frame capable of mounting a mobile power supply device (200).

[0053] The mobile power supply device (200) moves toward the anchored vessel and, in conjunction with the vessel energy storage device (110) mounted on the vessel (100), supplies land power to the vessel or recovers power stored in the vessel (100).

[0054] This mobile power supply device (200) may include a power supply cable device (220) for winding or unwinding a charging cable for power supply, and a land energy storage device (land ESS) (230) for storing power to supply charging power to a ship (100) or storing power recovered from the ship (100).

[0055] Here, the power supply cable device (220) may include, as shown in FIG. 4, a power plug (221) for supplying power to or recovering power to a ship (100), a pulling roller (222) connected to the power plug (221) to guide a charging cable connected to the power plug (221), a pulling motor (223) for rotating the pulling roller (222), a telescope (224) for adjusting the length of the pulling motor (223) and the pulling roller (222), a cable reel (225) for adjusting the length of the charging cable, a charging cable reel (226) for winding or unwinding the charging cable, a power socket (227), a power plug (228) for external power supply, an external cable (229) for external power supply, etc.

[0056] In addition, the above-described land energy storage device (230) may include a power control unit (PCS) (231) that performs power charging and supply, an energy bank (232) that charges power supplied by the power control unit (213) and discharges the charged power to supply power, and a power management unit (PMS) (233) that manages power through a process of controlling charging and discharging in conjunction with the power control unit (231) and the energy bank (232).

[0057] Preferably, the power control unit (231) may include an AC-DC converter (231a) that converts AC power supplied from the ground (Grid) (300) into DC power, a DC-DC converter (231c) that converts the DC power converted by the AC-DC converter (231a) into DC power to match the capacity of the lithium battery which is an energy bank to charge the lithium battery, or converts the power charged in the lithium battery into DC power to discharge it, and a controller (231b) that controls the operation of the AC-DC converter (231a) and the DC-DC converter (231c).

[0058] In addition, the DC-DC converter (231c) can convert excess power output from the vessel (100) into DC to match the capacity of the lithium battery to charge the lithium battery, or convert power charged in the lithium battery into DC to discharge it.

[0059] Additionally, the mobile power supply device (200) may be equipped with a movement control unit (210) that controls the movement of the mobile power supply device, and a bidirectional charging unit (240) that is linked to the land energy storage device (110) and the movement control unit (210) and supplies power to the ship energy storage device (110) or recovers the charging power of the ship energy storage device (110).

[0060] Preferably, the bidirectional charging unit (240) may include a power conversion unit (241) that converts power supplied from the land energy storage device (230) into power corresponding to the load, a dispenser (242) that supplies the power converted by the power conversion unit (241) to the ship energy storage device (110) or the vehicle charging unit (510), and a main controller (243) that is connected via communication to the land energy storage device (230) and the ship energy storage device (110) to monitor the energy status of each energy storage device and to control the charging and discharging of the land energy storage device (230) and the ship energy storage device (110) based on the monitoring results.

[0061] The operation of the mobile bidirectional power supply system that links power between a ship and land according to a preferred embodiment of the present invention configured as described above is specifically explained as follows.

[0062] First, the mobile bidirectional power supply system for linking power between a ship and land according to the present invention is broadly divided into: first, a process of charging power stored in a land energy storage device into a ship energy storage device; second, a process of recovering ship power by transmitting power stored in the ship energy storage device to a land energy storage device; and third, a process of charging another ship or electric vehicle, etc., using power stored in the land energy storage device or power recovered from the ship at a bidirectional charger.

[0063] First, the process of charging the ship energy storage device (110) with power charged using a mobile power supply device (200) is described as follows.

[0064] First, when a vessel (100) requiring charging is docked at a sea port, the mobile power supply unit (200) moves to the docked vessel (100) by operating its wheels under the control of the movement control unit (210). Accordingly, the vessel (100) can receive onshore power without needing to move from its current docked position.

[0065] Here, the land energy storage device (230) of the mobile power supply device (200) uses land power in advance to sufficiently charge the lithium battery, which is an energy bank (232) built-in, to be transmitted to the ship.

[0066] For example, the AC-DC converter (231a) of the above-ground energy storage device (230) converts AC power (3-phase, 380V, 60Hz) supplied from the ground into DC power. The DC-DC converter (231c) converts the DC power converted by the above-ground AC-DC converter (231a) into DC power to match the capacity of the lithium battery and charges the lithium battery.

[0067] Here, the controller (231b) controls the operation of the AC-DC converter (231a) and the DC-DC converter (231c), and the power management unit (233) controls charging and discharging based on the status information of the lithium battery.

[0068] In addition, the power management unit (233) controls the power operation of the land energy storage device (230) in conjunction with the main controller (243) of the bidirectional charging unit (240).

[0069] In this process, power to be supplied to the ship is stored in the land energy storage device (230), and then the mobile power supply device (200) moves to a position where it can supply charging power to the ship (100), and then the power supply cable device (220) is embedded in the mobile power supply device (200) and moves the charging cable for power supply to the charging position of the ship (100).

[0070] For example, after moving the power plug (221), unwinding roller (222), and pulling motor (223) of the power supply cable device (220) to an appropriate position, the charging cable wound on the charging cable reel (226) is unwound, and the charging cable thus unwound is moved toward the ship by the pulling roller (222) guiding it through the operation of the pulling motor (223).

[0071] Next, when the charging cable is positioned at the power charging socket of the vessel, the power plug (221) is connected to the power charging socket of the vessel to prepare to supply onshore power to the vessel.

[0072] Next, the main controller (243) of the mobile power supply unit (200) connects to the ship energy storage unit (110) via communication and requests charging, and in response to this charging request, the power management unit of the ship energy storage unit (110) transmits charging status information to the main controller (243).

[0073] The above main controller (243) analyzes the status information of the ship energy storage device and, when the charging conditions for onshore power are satisfied (based on the preferred SoC operation percentage), supplies the onshore power stored in the onshore energy storage device (230) to the ship energy storage device (110) through a charging cable to charge the ship energy storage device (110).

[0074] When charging power is supplied from the mobile power supply unit (200) to the ship energy storage device (110), the first DC-DC converter (111a) receives DC power supplied from land and converts it into a predetermined DC power (100kW) and outputs it.

[0075] The second DC-DC converter (111b) converts the DC power converted by the first DC-DC converter (111a) into an appropriate DC power to match the capacity of the lithium battery (LiB) implementing the energy bank (112) and charges the lithium battery.

[0076] When charging the lithium battery, the power management unit (113) acquires the charge status of the lithium battery in real time and transmits it to the main controller (243).

[0077] Here, the first and second DC-DC converters (111a) and (111b) are controlled by a controller (111c), and the control result is transmitted to a power management unit (113).

[0078] The above power management unit (113) controls the power operation of the ship energy storage device (110) in conjunction with the above main controller (243), and transmits and receives power information through communication with the mobile power supply device (200) to stably charge the ship energy storage device (110).

[0079] Next, the process of recovering power stored in the ship energy storage device from the mobile power supply device (200) is described as follows.

[0080] A waste heat generator for a ship is provided within the ship (100) to generate electricity using waste heat, and the generated electricity is stored in a ship energy storage device (110).

[0081] Next, when the vessel (100) requiring discharge is docked at a sea port, the mobile power supply device (200) moves to the docked vessel (100) by operating the wheels of the mobile unit under the control of the movement control unit (210). Accordingly, the vessel (100) can discharge power to land without needing to move from its current docked position.

[0082] That is, after the mobile power supply device (200) moves to a location where it can recover charging power from the ship (100), the power supply cable device (220) is embedded in the mobile power supply device (200) and moves the power supply charging cable to the charging location of the ship (100).

[0083] For example, after moving the power plug (221), unwinding roller (222), and pulling motor (223) of the power supply cable device (220), the charging cable wound on the charging cable reel (226) is unwound, and the charging cable thus unwound is moved toward the ship by the pulling roller (222) guiding it by the operation of the pulling motor (223).

[0084] Next, when the charging cable is positioned at the power charging socket of the vessel, the power plug (221) is connected to the power charging socket of the vessel to prepare for the recovery of the vessel's discharge power on land.

[0085] Next, the main controller (243) of the mobile power supply unit (200) connects to the ship energy storage unit (110) via communication and requests a discharge, and in response to this discharge request, the power management unit of the ship energy storage unit (110) transmits battery status information to the main controller (243).

[0086] The above main controller (243) analyzes the status information of the ship energy storage device and, when the charging conditions of the onshore power are satisfied (based on the preferred SoC operation percentage), controls the ship's charged power to be discharged to the shore.

[0087] In response to this control, the ship energy storage device (110) stores electrical energy produced from a waste heat generator in a lithium battery, and then outputs the power stored in the lithium battery to land through discharge. At this time, the second DC-DC converter (111b) converts the discharged power output from the lithium battery into a predetermined DC power (100kW) and outputs it.

[0088] The first DC-DC converter (111a) converts the DC power converted by the second DC-DC converter (111b) into appropriate DC and outputs it to a mobile power supply (200).

[0089] Here, the first and second DC-DC converters (111a) (111b) are controlled by a controller (PCS) (111c), and the control result is transmitted to a power management unit (113).

[0090] The power management unit (113) controls the power operation of the ship energy storage device (110) in conjunction with the main controller (243), thereby stably discharging the energy of the ship energy storage device (110) and outputting it to land.

[0091] The charger (242) of the bidirectional charging unit (240) of the above-described land energy storage device (230) can recover power stored in the ship (100) and store it in the above-described land energy storage device (230), or charge the power recovered from the ship (100) into the battery of another ship (400).

[0092] For example, the main controller (243) of the bidirectional charging unit (240) controls the charging of the ship according to the discharge state of the ship energy storage device (110) detected through the power management unit (113), and controls the supply of power recovered from the ship (100) as charging power to the land energy storage device (230) or another ship (400).

[0093] According to this control, the bidirectional charging unit (240) can store power recovered from the ship in the onshore energy storage device (230) or supply it to another ship.

[0094] Next, the process of transmitting power recovered from a ship to another ship to charge it, or storing power recovered from a ship in a land-based energy storage device and then discharging it to charge another target (e.g., an electric vehicle), is explained in detail as follows.

[0095] First, the ship's waste heat generator (110) is provided within the ship (100) to generate electricity using waste heat and to store the generated electricity in the ship's energy storage device (110).

[0096] Next, when the vessel (100) requiring discharge is docked at a sea port, the mobile land power supply device (200) moves the mobile power supply device (200) to the docked vessel (100) by operating the wheels under the control of the movement control unit (210). Accordingly, the vessel (100) can discharge power to land without needing to move from its current docked position.

[0097] That is, after the mobile land power supply device (200) moves to a location where it can recover charging power from the ship (100), the power supply cable device (220) is embedded in the mobile land power supply device (200) and moves the power supply charging cable to the charging location of the ship (100).

[0098] For example, after moving the power plug (221), unwinding roller (222), and pulling motor (223) of the power supply cable device (220), the charging cable wound on the charging cable reel (226) is unwound, and the charging cable thus unwound is moved toward the ship by the pulling roller (222) guiding it by the operation of the pulling motor (223).

[0099] Next, when the charging cable is positioned in the power charging socket of the ship, the power plug (221) is connected to the power charging socket of the ship to prepare to recover the ship's discharge power on land.

[0100] Next, the main controller (243) of the mobile power supply unit (200) connects to the ship energy storage unit (110) via communication and requests a discharge, and in response to this discharge request, the power management unit (113) of the ship energy storage unit (110) transmits battery status information to the main controller (243).

[0101] The above main controller (243) analyzes the status information of the ship energy storage device and, when the charging conditions of the onshore power are satisfied (based on the preferred SoC operation percentage), controls the ship's charged power to be discharged to the shore.

[0102] In response to this control, the ship energy storage device (110) stores electrical energy produced from a waste heat generator in a lithium battery, and then outputs the power stored in the lithium battery to land through discharge. At this time, the second DC-DC converter (111b) converts the discharged power output from the lithium battery into a predetermined DC power (100kW) and outputs it.

[0103] The first DC-DC converter (111a) converts the DC power converted by the second DC-DC converter (111b) into appropriate DC and outputs it to a mobile power supply (200).

[0104] Here, the first and second DC-DC converters (111a) (111b) are controlled by a controller (PCS) (111c), and the control result is transmitted to a power management unit (113).

[0105] The power management unit (113) controls the power operation of the ship energy storage device (110) in conjunction with the main controller (243).

[0106] The bidirectional charging unit (240) of the above-mentioned mobile power supply device (200) can recover power stored in the vessel (100) and store it in the above-mentioned land energy storage device (230), or charge the power recovered from the vessel (100) into the battery of another vessel (400).

[0107] For example, the main controller (243) of the bidirectional charging unit (240) controls the charging of the ship according to the discharge state of the detected ship energy storage device (110), and controls the supply of power recovered from the ship (100) as charging power to the land energy storage device (230) or another ship.

[0108] According to this control, the charger (242) of the bidirectional charging unit (240) can store power recovered from the ship in the onshore energy storage device (230) or supply it to another ship.

[0109] Power recovered from the ship can be stored in a land-based energy storage device (230) and then supplied to other ships in real time through power conversion.

[0110] That is, the land energy storage device (230) converts the supplied power according to the charging power of the connected charging target (e.g., electric propulsion vessel, electric vehicle, etc.) and charges the charging target. Here, when charging the charging target, the charging target can be charged via wired charging or wireless charging. The wired charging or wireless charging method may utilize a predefined wired charging method or wireless charging method.

[0111] According to the present invention described above, power can be conveniently supplied to a docked vessel while moving on land, and the vessel can conveniently receive power without moving from its docked position, thereby providing convenience.

[0112] In addition, according to the present invention, the vessel can move to the anchored location to recover the vessel's power and supply charging power to an electric vehicle or another vessel.

[0113] Although the invention made by the inventors has been specifically described according to the above embodiments, it is obvious to those skilled in the art that the invention is not limited to the above embodiments and can be modified in various ways without departing from the gist thereof. Explanation of the symbols

[0114] 100, 400: Ships 110: Ship Energy Storage System (Ship ESS) 200: Portable power supply 210: Movement control unit 220: Cable device for power transmission 230: Onshore Energy Storage System (Onshore ESS) 240: Bidirectional charging part 243: Main controller 300: Grid 500: Electric Vehicle

Claims

Claim 1 A ship energy storage device installed on a ship to store generated power and discharge stored power, and to store power supplied from land through a power cable and discharge the stored power to a mobile power supply device; a mobile power supply device that moves toward the anchored ship and, in conjunction with the ship energy storage device, supplies land power to the ship or recovers power stored in the ship, wherein the mobile power supply device includes a power supply cable device (220) that winds or unwinds a charging cable for power supply; The device includes a land-based energy storage device for storing power to supply charging power to a vessel or storing power recovered from said vessel, and the power supply cable device (220) includes a power plug (221) for supplying power to a vessel or recovering power, a pulling roller (222) connected to the power plug (221) and guiding a charging cable connected to the power plug (221), a pulling motor (223) for rotating the pulling roller (222), a telescope (224) for adjusting the length of the pulling motor (223) and the pulling roller (222), a cable reel (225) for adjusting the length of the charging cable, a charging cable reel (226) for winding or unwinding the charging cable, a power plug (228) for supplying external power, and an external cable (229) for supplying external power, thereby variably adjusting the length of the charging cable, and the mobile power supply device is for moving the mobile power supply device A movement control unit; a bidirectional charging unit connected to the land energy storage device and the movement control unit, and configured to supply power to the ship energy storage device or recover charging power from the ship energy storage device, wherein the bidirectional charging unit comprises: a power conversion unit that converts power supplied from the land energy storage device into power corresponding to the load; and a charger that supplies the power converted by the power conversion unit to the ship energy storage device or the vehicle charging unit.A mobile bidirectional power supply system for linking power between a ship and land, comprising a main controller that is connected via communication to the above-mentioned land energy storage device and ship energy storage device, monitors the energy status of each energy storage device, and controls the charging and discharging of the land energy storage device and ship energy storage device based on the monitoring results; wherein the main controller transmits power recovered from the ship to another ship to charge the other ship, stores power recovered from the ship in the land energy storage device and then discharges it to charge another target, or charges the ship with power stored in the land energy storage device, and wherein the main controller analyzes the status information of the ship energy storage device and, if the charging conditions of the land power are satisfied, controls the discharge of the ship's charged power to the land. Claim 2 A mobile bidirectional power supply system for linking power between a ship and land, wherein the land energy storage device comprises: a power control unit (PCS) that performs power charging and supply; an energy bank that charges power supplied by the power control unit and discharges the charged power to supply power; and a power management unit (PMS) that links with the power control unit and the energy bank and manages power through a process of controlling charging and discharging. Claim 3 In claim 2, the power control unit comprises: an AC-DC converter that converts AC power supplied from the land (Grid) into DC power; a DC-DC converter that converts the DC power converted by the AC-DC converter into DC to match the capacity of the lithium battery to charge the lithium battery, or converts the power charged in the lithium battery into DC to discharge it; and a controller that controls the operation of the AC-DC converter and the DC-DC converter, wherein the DC-DC converter converts surplus power output from the ship into DC to match the capacity of the lithium battery to charge the lithium battery, or converts the power charged in the lithium battery into DC to discharge it, characterized in that it is a mobile bidirectional power supply system that links power between a ship and land. Claim 4 delete Claim 5 delete Claim 6 A mobile bidirectional power supply system for linking power between a ship and land, wherein the ship energy storage device comprises: a power control unit (PCS) that performs power charging and supply; an energy bank that charges power supplied by the power control unit and discharges the charged power to supply power; and a power management unit (PMS) that links with the power control unit and the energy bank and manages power through a process of controlling charging and discharging.

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