Flywheel energy storage-based ferry system and method

Abstract

The invention provides a ferry wheel system based on flywheel energy storage, which comprises a running system, a flywheel energy storage system, a battery energy storage system, a transduction system and a shore energy complementing system, the running system comprises a driving motor and a propeller, and the driving motor is used for driving the propeller to rotate so as to drive a ferry wheel to run. The invention provides a ferry method based on flywheel energy storage, which comprises the following steps: S1, ferry energy storage: supplementing energy to a flywheel energy storage system and a battery energy storage system through a shore energy supplementing system; s2, the ferry sails, the energy conversion system uses the flywheel energy storage system to provide electric energy for the driving system, and the ferry is driven to complete one-time river bank crossing sailing. The flywheel energy storage system is low in cost and used for driving the ferry to sail between two or three or more wharfs, the manufacturing cost of the ferry is reduced, meanwhile, the use and maintenance cost of the ferry is reduced, and meanwhile, compared with a traditional fuel ferry, the ferry has the advantage of being environmentally friendly.

Description

Technical Field

[0001] The present invention relates to the technical field of ferries, and in particular to a ferry system and method based on flywheel energy storage. Background Art

[0002] A ferry is a water transport vehicle, which can be a boat or a sampan, traveling between two or three or more docks. Ferries can be scheduled or they can only depart when they are full. Water taxis in Venice are also called ferries. Ferry transportation is more mobile than river crossing bridges and undersea tunnels, which have high investment costs, long payback periods, and relatively high investment risks.

[0003] Existing ferries are mainly fueled by fuel. However, due to the development of battery technology and the fact that battery power systems are more environmentally friendly than fuel systems, they are widely promoted. Therefore, there are also many electric ferries. However, considering that the energy consumption of a single ferry trip is not too large, the use of battery technology, such as the use of large batteries, will increase the cost of the ferry, and when small batteries are used, they need to be charged frequently, which affects the life of the battery. Or when using a fuel-driven ferry, it will cause greater pollution, and the fuel consumption is also not small. The exhaust gas generated in the process affects the experience of people on the ferry. Therefore, there is a need for a ferry system that is energy-saving and environmentally friendly, and has low investment and maintenance costs, to replace and solve the environmental protection and cost issues of the current electric energy storage ferry or traditional fuel ferry system. Summary of the invention

[0004] In order to solve the environmental problem of using fuel in the prior art ferries and the high cost problem of using batteries to drive ferries.

[0005] The technical solution of the present invention: A ferry system based on flywheel energy storage is provided, comprising a travel system, a flywheel energy storage system, a battery energy storage system, an energy conversion system and an onshore energy replenishment system. The travel system comprises a drive motor and a propeller, and the drive motor is used to drive the propeller to rotate and thereby drive the ferry to travel.

[0006] The flywheel energy storage system includes an energy storage flywheel and a generator. The energy storage flywheel is connected to the generator. The energy storage flywheel realizes kinetic energy storage by rotation. The generator is used to convert the kinetic energy of the energy storage flywheel rotation into electrical energy.

[0007] The battery energy storage system includes a battery assembly, which is used for storing electric energy and can be used to drive a drive motor to rotate.

[0008] The energy conversion system is used to switch between the flywheel energy storage system and the battery energy storage system to provide electrical energy for the driving system. The shore energy replenishment system is used to replenish the flywheel energy storage system and the battery energy storage system when the ferry approaches the shore.

[0009] Preferably, the present invention provides a ferry system based on flywheel energy storage, wherein the flywheel energy storage system further includes an energy storage motor, and the energy storage flywheel is driven by the energy storage motor to achieve kinetic energy replenishment.

[0010] Preferably, the present invention provides a ferry system based on flywheel energy storage, wherein a clutch is connected between the energy storage flywheel and the generator, and the clutch is used to control whether the energy storage flywheel provides kinetic energy to the generator.

[0011] Preferably, the present invention provides a ferry system based on flywheel energy storage, wherein the energy conversion system includes a dual power converter, the input ends of the dual power supplies are electrically connected to the flywheel energy storage system and the battery energy storage system respectively, and the output end of the dual power converter is electrically connected to the travel system.

[0012] Preferably, in the present invention, a ferry system based on flywheel energy storage, the battery assembly includes a lithium battery.

[0013] The present invention provides a ferry method based on flywheel energy storage, the steps of which include: S1. Ferry energy storage. When the ferry approaches the shore, the flywheel energy storage system and the battery energy storage system are replenished with energy through the shore energy replenishment system, so that the flywheel energy storage system or the battery energy storage system can independently drive the ferry to complete a river crossing.

[0014] S2, ferry navigation, the energy conversion system uses the flywheel energy storage system to provide electrical energy for the driving system and drives the ferry to complete a river crossing.

[0015] S3. Repeat steps S1 to S2.

[0016] Preferably, the present invention provides a ferry method based on flywheel energy storage. In step S2, when a sudden fault occurs during the ferry crossing the river bank, causing all the energy of the flywheel energy storage system to be insufficient to drive the ferry to complete a crossing of the river bank, the energy conversion system uses the battery energy storage system to provide electrical energy to the driving system and drives the ferry to complete a crossing of the river bank.

[0017] Beneficial effects of the present invention: The present invention discloses a ferry system and method based on flywheel energy storage. The system and method include a travel system, a flywheel energy storage system, a battery energy storage system, an energy conversion system and an onshore energy replenishment system. The system and method adopt a low-cost flywheel energy storage system to drive the ferry to complete navigation between two or three or more docks. While solving the manufacturing cost of the ferry, it also reduces its use and maintenance cost. Compared with traditional fuel ferries, the system and method also have the advantage of environmental protection. The system and method also adopt a battery energy storage system to ensure that the ferry can complete navigation requirements in an emergency or when the flywheel fails. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a structural schematic diagram of a ferry system based on flywheel energy storage according to the present invention; Figure 2 This is a structural schematic diagram of a ferry system based on flywheel energy storage according to the present invention; Names and serial numbers in the figure: 1. Driving system; 2. Energy conversion system; 3. Battery energy storage system; 4. Flywheel energy storage system; 11. Propeller; 12. Drive motor; 31. Battery assembly; 41. Generator; 42. Energy storage flywheel; 43. Energy storage motor. DETAILED DESCRIPTION

[0019] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is described in detail below with reference to the accompanying drawings.

[0020] like Figure 1 to Figure 2 As shown, the present invention provides a ferry system based on flywheel energy storage, including a travel system 1, a flywheel energy storage system 4, a battery energy storage system 3, an energy conversion system 2 and an onshore energy replenishment system. The travel system 1, the flywheel energy storage system 4, the battery energy storage system 3 and the energy conversion system 2 are all installed on the ferry and connected to the ferry, while the onshore energy replenishment system is installed on the dock where the ferry sails, and is used to replenish the ferry when the ferry docks to ensure that the ferry has sufficient energy for the next voyage.

[0021] The function of the travel system 1 is to drive the ferry to sail, that is, to provide direct driving force for the ferry so that the ferry can sail between docks in the river or on the sea. The travel system 1 includes a drive motor 12 and a propeller 11. The drive motor 12 is used to drive the propeller 11 to rotate and drive the ferry to travel, and the propeller 11 is a component used to directly drive the ferry to travel. A motor driver is connected to the drive motor 12 to control the operation of the drive motor 12, and a gearbox or a reducer can be connected between the drive motor 12 and the propeller 11 to increase the torque of the propeller 11 so as to drive the ferry to sail more stably and reliably.

[0022] The function of the flywheel energy storage system 4 is to store the energy required for the ferry to sail by means of flywheel energy storage, that is, to use a flywheel with low cost and low maintenance and use cost to store energy for the ferry, so that the ferry can have low use and maintenance costs, and also meet the requirements of energy saving and environmental protection. The flywheel energy storage system 4 includes an energy storage flywheel 42 and a generator 41, the energy storage flywheel 42 is connected to the generator 41, the energy storage flywheel 42 realizes kinetic energy storage by rotation, and the generator 41 is used to convert the kinetic energy of the energy storage flywheel 42 into electrical energy. That is, by making the energy storage flywheel 42 realize high-speed rotation to achieve the effect of energy storage, and when the energy storage flywheel 42 is needed to drive the ferry to sail, the kinetic energy of the energy storage flywheel 42 is converted into electrical energy by using the generator 41, so that the drive motor 12 can receive the electrical energy transmitted by the generator 41 to drive the propeller 11 to rotate, thereby realizing the drive of the ferry.

[0023] The battery energy storage system 3 is mainly used to provide driving energy to the travel system 1 in time when the flywheel energy storage system 4 fails during use, that is, as a backup or emergency backup power supply of the ferry system to reduce or avoid power supply failures during the voyage of the ferry. The battery energy storage system 3 includes a battery assembly 31, which is used for storing electric energy and can be used to drive the drive motor 12 to rotate. The battery assembly 31 can be a lithium battery or a conventional lead-acid battery, and can be selected according to comprehensive cost and needs in actual ferry applications.

[0024] The energy conversion system 2 is used to switch between the flywheel energy storage system 4 and the battery energy storage system 3 to provide electrical energy for the travel system 1, that is, the ferry has priority over the energy in the flywheel energy storage system 4 during normal navigation, and only when the energy in the flywheel energy storage system 4 is exhausted or a failure occurs, the energy conversion system 2 promptly switches the energy supply source of the travel system 1 to avoid the ferry stopping in the event of a flywheel energy storage failure or an emergency.

[0025] The onshore energy replenishment system is used to replenish the flywheel energy storage system 4 and the battery energy storage system 3 when the ferry approaches the shore, that is, when the ferry sails to the dock or the shore, the onshore energy replenishment system can replenish the flywheel energy storage system 4 in time. Since the application of ferries is mainly used for the transportation of goods or personnel on both sides of the river bank, the energy required for a single voyage is not too much, that is, the energy storage of the flywheel can meet the needs of ferries between the two banks of the river. When the ferry docks, the onshore energy replenishment system can replenish the flywheel energy storage system 4 or the battery energy storage system 3 in time. Therefore, under the premise of ensuring the navigation needs of the ferry, the battery loss of the battery-powered ferry can be better saved, and at the same time, the environmental pollution caused by the fuel-powered ferry can be well avoided.

[0026] Preferably, in the present invention, a ferry system based on flywheel energy storage, in order to realize rapid energy replenishment of the energy storage flywheel 42, the flywheel energy storage system 4 also includes an energy storage motor 43, and the energy storage flywheel 42 is driven by the energy storage motor 43 to realize kinetic energy replenishment. Figure 2 As shown, one end of the energy storage flywheel 42 is connected to the energy storage motor 43. When the ferry docks, the energy storage motor 43 can be driven by shore power to replenish energy for the energy storage flywheel 42. Therefore, when the ferry docks, the energy storage flywheel 42 can be quickly replenished to achieve efficient navigation of the ferry.

[0027] Preferably, in a ferry system based on flywheel energy storage of the present invention, in order to reduce the energy loss of the energy storage flywheel 42 when the ferry stops sailing, a clutch is connected between the energy storage flywheel 42 and the generator 41, and the clutch is used to control whether the energy storage flywheel 42 provides kinetic energy to the generator 41. That is, when the ferry docks or stops sailing, the energy storage flywheel 42 can be disconnected from the generator 41 by controlling the clutch, that is, the energy storage flywheel 42 is disconnected from the generator 41, so that the energy loss of the energy storage flywheel 42 when the ferry stops can be more efficiently avoided, and the energy utilization efficiency of the flywheel energy storage system 4 is further improved.

[0028] Preferably, the present invention is a ferry system based on flywheel energy storage, in order to improve the control efficiency and reliability of the energy conversion system 2, such as Figure 2 As shown, the energy conversion system 2 includes a dual power converter, the input end of the dual power converter is electrically connected to the flywheel energy storage system 4 and the battery energy storage system 3 respectively, and the output end of the dual power converter is electrically connected to the travel system 1. The preferred input end of the dual power converter is set to the flywheel energy storage system 4, thereby ensuring the use efficiency of the flywheel energy storage system 4 during the ferry voyage, thereby reducing the ferry's dependence on the energy storage battery, and further reducing the use of the ferry on the battery and thus reducing the subsequent battery maintenance cost.

[0029] The present invention provides a ferry method based on flywheel energy storage, the steps of which include: S1, ferry energy storage, that is, when the ferry approaches the shore, the onshore energy replenishment system replenishes energy to the flywheel energy storage system 4 and the battery energy storage system 3, so that the flywheel energy storage system 4 or the battery energy storage system 3 can be used to drive the ferry to complete a crossing of the river bank. That is, when the ferry docks, the onshore energy replenishment system is used in time to replenish the flywheel energy storage system 4 and the battery energy storage system 3 of the ferry, so as to ensure that the energy of the flywheel energy storage system 4 is sufficient to support the ferry to complete the navigation needs, so as to ensure the normal operation of the ferry.

[0030] S2, ferry navigation, energy conversion system 2 uses flywheel energy storage system 4 to provide electric energy for driving system 1, and drives the ferry to complete a river crossing. During the ferry navigation, when the flywheel energy storage system 4 can still provide enough energy for the ferry navigation, energy conversion system 2 connects the driving power source of driving system 1 to flywheel energy storage system 4, so as to ensure that the ferry is sailing with the energy in flywheel energy storage system 4.

[0031] S3, repeating steps S1 to S2, ensuring that the ferry is sailing mainly with the energy of the flywheel energy storage system 4, thereby reducing the ferry's dependence on power supply and giving full play to the low-cost operation effect of the flywheel energy storage system 4.

[0032] Preferably, in the present invention, a ferry method based on flywheel energy storage, in step S2, when a fault occurs during the ferry crossing the river bank, causing all the energy of the flywheel energy storage system 4 to be insufficient to drive the ferry to complete a crossing of the river bank, the energy conversion system 2 uses the battery energy storage system 3 to provide power to the driving system 1, and drives the ferry to complete a crossing of the river bank. That is, the ferry system uses the battery energy storage system 3 as a backup power supply or emergency power supply, which can better ensure that the ferry can stably and reliably complete the navigation needs.

[0033] Specific embodiments are used in this article to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the methods and core ideas of the present invention. The above are only preferred implementation methods of the present invention. It should be pointed out that due to the limitations of textual expression, there are objectively infinite specific structures. For ordinary technicians in this technical field, without departing from the principles of the present invention, several improvements, modifications or changes can be made, and the above technical features can be combined in an appropriate manner; these improvements, modifications, changes or combinations, or the direct application of the inventive concept and technical solution to other occasions without improvement, should be regarded as the protection scope of the present invention.

Claims

1. A ferry system based on flywheel energy storage, characterized in that: include: A travel system (1), the travel system (1) comprising a drive motor (12) and a propeller (11), the drive motor (12) being used to drive the propeller (11) to rotate and thereby drive the ferry to travel; A flywheel energy storage system (4), the flywheel energy storage system (4) comprising an energy storage flywheel (42) and a generator (41), the energy storage flywheel (42) being connected to the generator (41), the energy storage flywheel (42) realizing kinetic energy storage by rotation, and the generator (41) being used to convert the kinetic energy of the rotation of the energy storage flywheel (42) into electrical energy; A battery energy storage system (3), the battery energy storage system (3) comprising a battery assembly (31), the battery assembly (31) being used for storing electric energy and being used for driving a drive motor (12) to rotate; An energy conversion system (2), the energy conversion system (2) being used to switch between using a flywheel energy storage system (4) or a battery energy storage system (3) to provide electrical energy for the travel system (1); An onshore energy replenishment system is used to replenish energy for a flywheel energy storage system (4) and a battery energy storage system (3) when the ferry approaches the shore.

2. A ferry system based on flywheel energy storage according to claim 1, characterized in that: The flywheel energy storage system (4) further comprises an energy storage motor (43), and the energy storage flywheel (42) is driven by the energy storage motor (43) to achieve kinetic energy replenishment.

3. A ferry system based on flywheel energy storage according to claim 1, characterized in that: A clutch is connected between the energy storage flywheel (42) and the generator (41), and the clutch is used to control whether the energy storage flywheel (42) provides kinetic energy to the generator (41).

4. A ferry system based on flywheel energy storage according to claim 1, characterized in that: The energy conversion system (2) comprises a dual power converter, the input end of the dual power converter being electrically connected to the flywheel energy storage system (4) and the battery energy storage system (3) respectively, and the output end of the dual power converter being electrically connected to the travel system (1).

5. A ferry system based on flywheel energy storage according to claim 1, characterized in that: The battery assembly (31) includes a lithium battery.

6. A ferry method based on flywheel energy storage, characterized in that: A ferry system based on flywheel energy storage using any one of claims 1 to 5, comprising the steps of: S1, ferry energy storage, when the ferry approaches the shore, the flywheel energy storage system (4) and the battery energy storage system (3) are replenished with energy through the shore energy replenishment system, so that the flywheel energy storage system (4) or the battery energy storage system (3) can be used alone to drive the ferry to complete a river crossing; S2, ferry navigation, the energy conversion system (2) uses the flywheel energy storage system (4) to provide electrical energy to the driving system (1), and drives the ferry to complete a river crossing; S3. Repeat steps S1 to S2.

7. A ferry method based on flywheel energy storage according to claim 6, characterized in that: In step S2, when a fault occurs during the ferry crossing the river bank, causing all the energy in the flywheel energy storage system (4) to be insufficient to drive the ferry to complete a crossing of the river bank, the energy conversion system (2) uses the battery energy storage system (3) to provide electrical energy to the driving system (1), and drives the ferry to complete a crossing of the river bank.

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