CN210212742U - Battery-powered watercraft with flywheel energy storage system - Google Patents
Battery-powered watercraft with flywheel energy storage system Download PDFInfo
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- CN210212742U CN210212742U CN201921288659.6U CN201921288659U CN210212742U CN 210212742 U CN210212742 U CN 210212742U CN 201921288659 U CN201921288659 U CN 201921288659U CN 210212742 U CN210212742 U CN 210212742U
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Abstract
The utility model provides a battery power boats and ships with flywheel energy storage system, include: the power battery pack, the propulsion system, the flywheel energy storage system and the distribution electric board are connected to the main distribution board through different types of power electronic converters, and other electric loads are connected to the distribution electric board. Battery power boats and ships with flywheel energy storage system, be applied to battery power boats and ships with flywheel energy storage technology, make flywheel energy storage system and power battery group coordination work through energy management system, improved battery power boats and ships electric power system's dynamic response speed and stability, energy recuperation when can realizing boats and ships braking plays the guard action to power battery group simultaneously, prolongs its working life.
Description
Technical Field
The utility model relates to a battery power boats and ships field particularly, especially relates to a battery power boats and ships with flywheel energy storage system.
Background
The world shipping industry is increasingly challenged by high oil price and environmental protection, the pressure of energy conservation and emission reduction is continuously increased, and green ships become the most important solution and the main direction of future ship development. Compared with the traditional ship power system, the battery-powered ship electric propulsion system has the advantages of wide speed regulation range, convenience in installation and maintenance, flexible layout, low vibration and noise, zero emission, good environmental protection performance and the like, and is more superior.
Taking a hydrogen fuel cell ship as an example, the hydrogen fuel cell directly converts chemical energy into electric energy without combustion, and has the advantages of cleanness, high efficiency, no pollution, low noise, modular structure, high power density, continuous work and the like. However, the external output characteristics of the hydrogen fuel cell are soft, the fuel cell efficiency is seriously reduced when the output power is too low, the cold start is difficult, the dynamic response is slow, the regenerative energy recovery cannot be realized, and in addition, the load demand fluctuation can damage the fuel cell stack and reduce the life cycle of the fuel cell stack; similarly, for a battery-powered ship powered by a single storage battery, the situation of large power fluctuation often occurs in the operation process, and at the moment, the single storage battery is difficult to meet the performance requirement and has the problem of shortened service life.
Disclosure of Invention
According to the hydrogen fuel cell provided by the invention, the output external characteristic is very soft, the efficiency of the fuel cell is seriously reduced when the output power is too low, the cold start is difficult, the dynamic response is slow, the regeneration energy recovery cannot be realized, the load demand fluctuation can damage the fuel cell group and reduce the life cycle of the fuel cell group; similarly, for a battery-powered ship powered by a single storage battery, the situation that the power fluctuates greatly often occurs in the operation process, and at the moment, the single storage battery is difficult to meet the performance requirement and has the technical problem of shortened service life, so that the battery-powered ship with the flywheel energy storage system is provided. The utility model discloses mainly be applied to battery power boats and ships with flywheel energy storage technology, make flywheel energy storage system and power battery group coordination work through energy management system, improved battery power boats and ships electric power system's dynamic response speed and stability, energy recuperation when can realizing the boats and ships braking plays the guard action to power battery group simultaneously, prolongs its working life.
The utility model discloses a technical means as follows:
a battery powered watercraft having a flywheel energy storage system comprising: the power distribution device comprises a main distribution board and a distribution board, wherein the main distribution board is respectively communicated with the power battery pack, the propulsion system, the flywheel energy storage system and the distribution board which are used for providing power through the power electronic converter, and the distribution board is used for connecting the power load and providing power for the power load; the flywheel energy storage system comprises a flywheel body, a reversible motor/generator and a vacuum chamber, wherein the reversible motor/generator and the vacuum chamber are coaxial with the flywheel body, the flywheel body and the reversible motor/generator are arranged in the vacuum chamber, and the reversible motor/generator is used for driving the flywheel body to store energy in a rotating mode or driving the reversible motor/generator to generate electricity under the inertial rotation driving of the flywheel body.
When the electric power of the ship on the ship is lower than the power provided by the power battery pack, the main distribution board distributes the electric energy to the flywheel energy storage system to drive the reversible motor/generator to rotate, so as to drive the flywheel body to rotate for energy storage.
When the power for the ship on the ship is higher than the power provided by the power battery pack, the flywheel body is driven by inertial rotation to drive the reversible motor/generator to generate power, and the power is transmitted to the main distribution board through the power electronic converter.
Further, the power battery pack is a hydrogen fuel battery pack, and the hydrogen fuel battery pack is connected with a hydrogen storage tank.
Further, the propulsion system comprises a propeller and a propulsion motor driving the propeller.
Furthermore, a bidirectional converter is arranged between the flywheel energy storage system and the main distribution board.
Further, the main distribution board is also connected with a fuel power generation device, and the fuel power generation device adopts LNG, diesel oil or mixed fuel of the LNG and the diesel oil.
Furthermore, a connecting bus in the main distribution board adopts a direct current bus or an alternating current bus; when a connecting bus in the main distribution board adopts a direct current bus, the power battery pack is connected with the main distribution board through a DC/DC converter, the propulsion system is connected with the main distribution board through a frequency converter and a first DC/AC inverter, and the distribution board is connected with the main distribution board through a transformer and a second DC/AC inverter; when the connecting bus in the main distribution board adopts an alternating current bus, the power battery pack is connected with the main distribution board through a DC/AC inverter, the propulsion system is connected with the main distribution board through a frequency converter and a first AC/AC converter, and the distribution board is connected with the main distribution board through a second AC/AC converter.
Further, the fuel power generation equipment comprises a generator and a dual-fuel engine, and an AC/DC rectifier is arranged between the generator and the main power distribution board.
Compared with the prior art, the utility model has the advantages of it is following:
1. the flywheel energy storage system and the power battery pack are adopted to work in a coordinated mode, and the dynamic response speed and the stability of the power system of the battery power ship are improved.
2. By adopting the flywheel energy storage system, the regenerative braking energy fed back to the power grid during the ship braking can be recovered.
3. The flywheel energy storage system and the power battery pack are adopted to work in a coordinated mode, the power battery pack is protected, the power battery pack can supply power to the outside efficiently and stably for a long time, and the service life of the power battery pack is prolonged.
4. When the ship loses power due to the failure of the power battery pack or other reasons, the flywheel energy storage system can provide emergency power supply.
5. The flywheel energy storage system has no pollution to the environment and can be charged and discharged repeatedly.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the description of the embodiments or the prior art are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive labor.
Fig. 1 is a schematic view of an embodiment of the present invention.
Fig. 2 is a schematic view of another embodiment of the present invention.
Wherein: 1. the system comprises a hydrogen storage tank, 2, a hydrogen fuel battery pack, 3, a DC/DC converter, 4, a main distribution board, 5, a first DC/AC inverter, 6, a frequency converter, 7, a propulsion motor, 8, a propeller, 9, an electric load, 10, a distribution board, 11, a transformer, 12, a second DC/AC inverter, 13, a bidirectional converter, 14, a flywheel body, 15, a first magnetic suspension bearing, 16, a vacuum chamber, 17, a reversible motor/generator, 18, a second magnetic suspension bearing, 19, an AC/DC rectifier, 20, a generator, 21 and a dual-fuel engine.
Detailed Description
It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
Unless specifically stated otherwise, the relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present invention. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the orientation words such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom", etc. are usually based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and in the case of not making a contrary explanation, these orientation words do not indicate and imply that the device or element in question must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the scope of the present invention: the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.
Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and if not stated otherwise, the terms have no special meaning, and therefore, the scope of the present invention should not be construed as being limited.
As shown in fig. 1, the utility model provides a battery power boats and ships with flywheel energy storage system, include: the power battery pack, the propulsion system, the power distribution device, the power electronic converter, the flywheel energy storage system and the electric load 9 are used for providing power for the sailing of ships, the power distribution device comprises a main distribution board and a distribution board, the main distribution board 4 is respectively communicated with the power battery pack, the propulsion system, the flywheel energy storage system and the distribution board 10 which are used for providing power through the power electronic converter, the power electronic converter with different types is adopted to be connected with the power battery pack, the propulsion system, the flywheel energy storage system and the distribution board 10, the distribution board 10 is used for being connected with the electric load 9, the electric load 9 is used for providing power for the electric load 9, the electric load 9 is other loads except the accidents of the propulsion system and the flywheel energy storage system, the flywheel energy storage system comprises a flywheel body 14, a reversible motor/generator 17 and a vacuum chamber 16 which are coaxial with the flywheel body 14, the flywheel body 14 and the reversible motor/generator 17 are disposed in the vacuum chamber 16, and the reversible motor/generator 17 is used for driving the flywheel body 14 to store energy in a rotating manner, or driving the reversible motor/generator 17 to generate electricity under the inertial rotation driving of the flywheel body 14.
When the electric power of the ship on the ship is lower than the power provided by the power battery pack, the main distribution board 4 distributes the electric energy to the flywheel energy storage system to drive the reversible motor/generator 17 to rotate, so as to drive the flywheel body 14 to rotate for energy storage.
When the power for the ship on the ship is higher than the power provided by the power battery pack, the flywheel body 14 is driven by the inertial rotation to drive the reversible motor/generator 17 to generate power, and the power is transmitted to the main distribution board 4 through the power electronic converter.
In the embodiment, the flywheel energy storage system and the power battery pack work in a coordinated manner, and an energy management system is adopted, wherein the energy management system comprises a power generation management subsystem, a load management subsystem and a power distribution management subsystem, the power generation management subsystem provides ship power, equipment and domestic electricity, the power distribution management subsystem controls connection and disconnection of bus segments, and the load management subsystem mainly performs power management and load limitation on a propeller and high-power electricity utilization equipment.
In the present embodiment, the power battery is a hydrogen fuel battery 2, the hydrogen fuel battery 2 is connected to a hydrogen storage tank 1, the hydrogen storage tank 1 provides hydrogen gas for the hydrogen fuel battery 2, the hydrogen fuel battery 2 generates electric energy through electrochemical reaction, and the output voltage of the hydrogen fuel battery 2 varies greatly due to the unstable electrochemical reaction, and is connected to the main distribution board 4 through a DC/DC converter 3 to output electric energy after voltage transformation and stabilization. Of course, in other embodiments of the present invention, the power battery pack may also be any other type of battery, which can supply power.
In the present embodiment, the propulsion system comprises a propeller 8 and a propulsion motor 7 driving the propeller 8.
In this embodiment, a bidirectional converter 13 is disposed between the flywheel energy storage system and the main distribution board 4, and the bidirectional converter 13 can convert the electric energy generated by the flywheel energy storage system to meet the requirement of the power grid.
In the present embodiment, the connecting bus in the main distribution board 4 is a dc bus or an ac bus; when a connecting bus in the main distribution board 4 adopts a direct current bus, the power battery pack is connected with the main distribution board 4 through the DC/DC converter 3, the propulsion system is connected with the main distribution board 4 through the frequency converter 6 and the first DC/AC inverter 5, the speed of a propeller 8 in the propulsion system can be regulated through the frequency conversion function of the frequency converter 6, the distribution board 10 is connected with the main distribution board through the transformer 11 and the second DC/AC inverter 12, the main distribution board 4 adopts the direct current bus, the eddy current loss and the reactive loss of a line of an alternating current power distribution network do not exist, and theoretically, the direct current system does not have the problems of frequency deviation, three-phase voltage imbalance, reactive compensation and the like, the power quality can be effectively improved, and the reliability of a power grid is improved.
When the connecting bus in the main distribution board 4 is an AC bus, the power battery pack is connected to the main distribution board 4 through a DC/AC inverter, the propulsion system is connected to the main distribution board 4 through a frequency converter and a first AC/AC converter, and the distribution board 10 is connected to the main distribution board through a second AC/AC converter.
In this embodiment, the driving shaft of the reversible motor/generator 17 is coaxially disposed with the rotating shaft on which the flywheel body 14 is mounted, and bearings are disposed at two ends of the rotating shaft respectively, and the bearings include a first magnetic suspension bearing 15 located at one side of the flywheel body 14 and a second magnetic suspension bearing 18 located at one side of the reversible motor/generator 17, and are used for cooperating with the vacuum chamber 16, so that energy loss during rotation of the flywheel is greatly reduced, and energy loss during operation of the flywheel energy storage system is reduced.
In the present embodiment, the reversible motor/generator 17 is used for driving the flywheel body 14 to store energy in a rotating manner or driving the reversible motor/generator 17 to generate electricity under the inertial rotation driving of the flywheel 14; the reversible motor/generator 17 adopts a direct-current permanent magnet brushless synchronous motor, the working mode is a motor/generator bidirectional reversible type, and the reversible motor/generator has the advantages of simple structure, high operating efficiency and good speed regulation performance; the flywheel energy storage system is also provided with a monitoring instrument for monitoring the rotating speed of the flywheel 14, and the monitoring instrument can also detect the temperature of the first magnetic suspension bearing 15 and the second magnetic suspension bearing 18, the vacuum degree of the vacuum chamber 16 and other parameters, so that the energy stored in the flywheel 14 can be accurately detected.
In this embodiment, as shown in fig. 2, the main distribution board 4 is further connected to a fuel power generation device, the fuel power generation device uses LNG, diesel oil, or a mixed fuel of LNG and diesel oil, the power battery pack can provide electric power for the main distribution board 4 together with other power generation devices to provide power for the ship, and the fuel used by the fuel power generation device can be pure LNG, pure diesel oil, LNG and diesel oil dual fuel, or any other form of fuel, and the purpose of the fuel power generation device can be auxiliary power generation. In the present embodiment, the fuel power generation apparatus includes a generator 20 and a dual fuel engine 21, and an AC/DC rectifier 19 is provided between the generator 20 and the main distribution board 4.
As shown in the figure, a method for using the battery-powered ship with the flywheel energy storage system comprises the following steps:
when the required driving power is larger than the power provided by the power battery pack under the working conditions of starting, accelerating, overload and the like of the ship, under the coordination of the energy management system, the flywheel energy storage system works in a discharging mode to release stored electric energy, and the flywheel energy storage system and the power battery pack jointly provide the power required by the propulsion system.
When the ship runs at idle speed, low speed or reduced speed, the power of the power battery pack is larger than the driving power, the power battery pack simultaneously supplies power to the flywheel energy storage system and the propulsion system, and the flywheel energy storage system works in a charging mode and stores electric energy in the form of flywheel rotation kinetic energy.
In this embodiment, when the ship is normally sailing, the power battery pack supplies power to the propulsion system, and the flywheel energy storage system works in a holding mode, and neither charges nor discharges; when the ship brakes, the power battery pack stops working, and the flywheel energy storage system works in a charging mode to absorb, store and feed back regenerative braking energy to the power grid.
Embodiment 1, as shown in fig. 1, the utility model provides a battery power boats and ships with flywheel energy storage system, include: the power battery pack, the propulsion system, the power distribution device, the power electronic converter, the flywheel energy storage system and the electric load 9 are used for providing power for the sailing of ships, the power distribution device comprises a main distribution board and a distribution board, the main distribution board 4 is respectively communicated with the power battery pack, the propulsion system, the flywheel energy storage system and the distribution board 10 which are used for providing power through the power electronic converter, the power electronic converter with different types is adopted to be connected with the power battery pack, the propulsion system, the flywheel energy storage system and the distribution board 10, the distribution board 10 is used for being connected with the electric load 9, the electric load 9 is used for providing power for the electric load 9, the electric load 9 is other loads except the accidents of the propulsion system and the flywheel energy storage system, the flywheel energy storage system comprises a flywheel body 14, a reversible motor/generator 17 and a vacuum chamber 16 which are coaxial with the flywheel body 14, the flywheel body 14 and the reversible motor/generator 17 are disposed in the vacuum chamber 16, and the reversible motor/generator 17 is used for driving the flywheel body 14 to store energy in a rotating manner, or driving the reversible motor/generator 17 to generate electricity under the inertial rotation driving of the flywheel body 14.
When the electric power of the ship on the ship is lower than the power provided by the power battery pack, the main distribution board 4 distributes the electric energy to the flywheel energy storage system to drive the reversible motor/generator 17 to rotate, so as to drive the flywheel body 14 to rotate for energy storage.
When the power for the ship on the ship is higher than the power provided by the power battery pack, the flywheel body 14 is driven by the inertial rotation to drive the reversible motor/generator 17 to generate power, and the power is transmitted to the main distribution board 4 through the power electronic converter.
In this embodiment, the flywheel energy storage system and the power battery pack work in a coordinated manner, and an energy management system is adopted, the energy management system comprises a power generation management subsystem, a load management subsystem and a power distribution management subsystem, the power generation management subsystem provides ship power, equipment and domestic power, the power distribution management subsystem controls connection and disconnection of bus segments, and the load management subsystem mainly performs power management and load limitation on a propeller and high-power electric equipment.
In this embodiment, the power battery is a hydrogen fuel battery 2, the hydrogen fuel battery 2 is connected to a hydrogen storage tank 1, the hydrogen storage tank 1 provides hydrogen for the hydrogen fuel battery 2, the hydrogen fuel battery 2 generates electric energy through electrochemical reaction, and the output voltage of the hydrogen fuel battery 2 changes greatly due to unstable electrochemical reaction, and is connected to a main distribution board 4 through a DC/DC converter 3 to output electric energy after voltage transformation and stabilization. Of course, in other embodiments of the present invention, the power battery pack may also be any other type of battery, which can supply power.
In the present embodiment, the propulsion system comprises a propeller 8 and a propulsion motor 7 driving the propeller 8.
In this embodiment, a bidirectional converter 13 is disposed between the flywheel energy storage system and the main distribution board 4, and the bidirectional converter 13 can convert the electric energy generated by the flywheel energy storage system to meet the requirement of the power grid.
In this embodiment, the connection bus in the main distribution board 4 is a DC bus, the power battery pack is connected to the main distribution board 4 through the DC/DC converter 3, the propulsion system is connected to the main distribution board 4 through the frequency converter 6 and the first DC/AC inverter 5, the propeller 8 in the propulsion system can be adjusted in speed through the frequency conversion function of the frequency converter 6, the distribution board 10 is connected to the main distribution board through the transformer 11 and the second DC/AC inverter 12, the main distribution board 4 is a DC bus, there are no eddy current loss of the AC power distribution network and no reactive loss of the line, and theoretically, the DC system has no problems of frequency deviation, three-phase voltage imbalance, reactive compensation, etc., and thus, the power quality can be effectively improved, and the reliability of the power grid can be improved.
In this embodiment, the driving shaft of the reversible motor/generator 17 is coaxially disposed with the rotating shaft on which the flywheel body 14 is mounted, and bearings are disposed at two ends of the rotating shaft respectively, and the bearings include a first magnetic suspension bearing 15 located at one side of the flywheel body 14 and a second magnetic suspension bearing 18 located at one side of the reversible motor/generator 17, and are used for cooperating with the vacuum chamber 16, so that energy loss during rotation of the flywheel is greatly reduced, and energy loss during operation of the flywheel energy storage system is reduced.
In the present embodiment, the reversible motor/generator 17 is used for driving the flywheel body 14 to store energy in a rotating manner or driving the reversible motor/generator 17 to generate electricity under the inertial rotation driving of the flywheel 14; the reversible motor/generator 17 adopts a direct-current permanent magnet brushless synchronous motor, the working mode is a motor/generator bidirectional reversible type, and the reversible motor/generator has the advantages of simple structure, high operating efficiency and good speed regulation performance; the flywheel energy storage system is also provided with a monitoring instrument for monitoring the rotating speed of the flywheel 14, and the monitoring instrument can also detect the temperature of the first magnetic suspension bearing 15 and the second magnetic suspension bearing 18, the vacuum degree of the vacuum chamber 16 and other parameters, so that the energy stored in the flywheel 14 can be accurately detected.
when the ship normally sails, the hydrogen fuel battery pack 2 supplies power to the propulsion system and other electric loads 9, and the flywheel energy storage system works in a holding mode and is not charged or discharged.
When the driving power required by the ship under the working conditions of acceleration, overload and the like is greater than the power which can be provided by the hydrogen fuel battery pack 2, under the coordination of the energy management system, the flywheel energy storage system works in a discharging mode, the reversible motor/generator 17 works in a generator mode, the rotating flywheel 14 drives the generator 17 to generate electricity by means of inertia to release stored electric energy, and the flywheel energy storage system and the hydrogen fuel battery pack 2 jointly provide the power required by the propulsion system.
When the ship runs at idle speed, low speed or at a reduced speed, the power of the hydrogen fuel battery pack 2 is larger than the driving power, the hydrogen fuel battery pack 2 simultaneously supplies power to the flywheel energy storage system and the propulsion system, the flywheel energy storage system works in a charging mode, the reversible motor/generator 17 works in a motor mode to drive the coaxial flywheel 14 to rotate in an accelerated mode, and the electric energy is stored in a kinetic energy mode of the rotation of the flywheel 14; the hydrogen fuel cell stack 2 can maintain a relatively stable output power and operate at a relatively high efficiency for a long time.
When the ship brakes, the propulsion motor 7 is in a feedback power generation state, at the moment, the hydrogen fuel cell set 2 stops working, and the flywheel energy storage system works in a charging mode and can absorb and store regenerative braking energy fed back to a power grid.
When the hydrogen fuel cell set 2 is started from a cold state to a normal operation process, or when the hydrogen fuel cell set 2 can not output electric energy due to sudden failure, the electric propulsion system is supplied with power by a flywheel energy storage system in an emergency.
Embodiment 3, as shown in fig. 2, the utility model provides a battery powered ship with flywheel energy storage system, include: the power battery pack, the fuel power generation equipment, the propulsion system, the power distribution device, the power electronic converter, the flywheel energy storage system and the electric load 9 are used for providing power for sailing of ships, the power distribution device comprises a main distribution board and a distribution board, the main distribution board 4 is respectively communicated with the power battery pack, the fuel power generation equipment, the propulsion system, the flywheel energy storage system and the distribution board 10 which are used for providing power through the power electronic converter, the power electronic converters of different types are adopted to be connected with the power battery pack, the propulsion system, the flywheel energy storage system and the distribution board 10, the distribution board 10 is used for being connected with the electric load 9, the distribution board 10 is used for providing power for the electric load 9, the electric load 9 is other loads except the propulsion system and the flywheel energy storage system, and the flywheel energy storage system comprises a flywheel body 14, a flywheel body 10, The flywheel body 14 and the reversible motor/generator 17 are arranged in the vacuum chamber 16, and the reversible motor/generator 17 is used for driving the flywheel body 14 to store energy in a rotating manner or driving the reversible motor/generator 17 to generate electricity under the inertial rotation driving of the flywheel body 14.
In this embodiment, the fuel power generation equipment uses LNG, diesel oil, or a mixed fuel of LNG and diesel oil, the power battery pack can provide electric power for the main distribution board 4 together with other power generation equipment to realize power supply to the ship, and the fuel used by the fuel power generation equipment can be pure LNG, pure diesel oil, LNG and diesel oil dual fuel, or any other form of fuel, and the purpose of the fuel power generation equipment can be auxiliary power generation. In the present embodiment, the fuel power generation apparatus includes a generator 20 and a dual fuel engine 21, and an AC/DC rectifier 19 is provided between the generator 20 and the main distribution board 4.
When the electric power of the ship on the ship is lower than the power provided by the power battery pack, the main distribution board 4 distributes the electric energy to the flywheel energy storage system to drive the reversible motor/generator 17 to rotate, so as to drive the flywheel body 14 to rotate for energy storage.
When the power for the ship on the ship is higher than the power provided by the power battery pack, the flywheel body 14 is driven by the inertial rotation to drive the reversible motor/generator 17 to generate power, and the power is transmitted to the main distribution board 4 through the power electronic converter.
In this embodiment, the flywheel energy storage system and the power battery pack work in a coordinated manner, and an energy management system is adopted, the energy management system comprises a power generation management subsystem, a load management subsystem and a power distribution management subsystem, the power generation management subsystem provides ship power, equipment and domestic power, the power distribution management subsystem controls connection and disconnection of bus segments, and the load management subsystem mainly performs power management and load limitation on a propeller and high-power electric equipment.
In this embodiment, the power battery is a hydrogen fuel battery 2, the hydrogen fuel battery 2 is connected to a hydrogen storage tank 1, the hydrogen storage tank 1 provides hydrogen for the hydrogen fuel battery 2, the hydrogen fuel battery 2 generates electric energy through electrochemical reaction, and the output voltage of the hydrogen fuel battery 2 changes greatly due to unstable electrochemical reaction, and is connected to a main distribution board 4 through a DC/DC converter 3 to output electric energy after voltage transformation and stabilization. Of course, in other embodiments of the present invention, the power battery pack may also be any other type of battery, which can supply power.
In the present embodiment, the propulsion system comprises a propeller 8 and a propulsion motor 7 driving the propeller 8.
In this embodiment, a bidirectional converter 13 is disposed between the flywheel energy storage system and the main distribution board 4, and the bidirectional converter 13 can convert the electric energy generated by the flywheel energy storage system to meet the requirement of the power grid.
In this embodiment, the connection bus in the main distribution board 4 is a DC bus, the power battery pack is connected to the main distribution board 4 through the DC/DC converter 3, the propulsion system is connected to the main distribution board 4 through the frequency converter 6 and the first DC/AC inverter 5, the propeller 8 in the propulsion system can be adjusted in speed through the frequency conversion function of the frequency converter 6, the distribution board 10 is connected to the main distribution board through the transformer 11 and the second DC/AC inverter 12, the main distribution board 4 is a DC bus, there are no eddy current loss of the AC power distribution network and no reactive loss of the line, and theoretically, the DC system has no problems of frequency deviation, three-phase voltage imbalance, reactive compensation, etc., and thus, the power quality can be effectively improved, and the reliability of the power grid can be improved.
In this embodiment, the driving shaft of the reversible motor/generator 17 is coaxially disposed with the rotating shaft on which the flywheel body 14 is mounted, and bearings are disposed at two ends of the rotating shaft respectively, and the bearings include a first magnetic suspension bearing 15 located at one side of the flywheel body 14 and a second magnetic suspension bearing 18 located at one side of the reversible motor/generator 17, and are used for cooperating with the vacuum chamber 16, so that energy loss during rotation of the flywheel is greatly reduced, and energy loss during operation of the flywheel energy storage system is reduced.
In the present embodiment, the reversible motor/generator 17 is used for driving the flywheel body 14 to store energy in a rotating manner or driving the reversible motor/generator 17 to generate electricity under the inertial rotation driving of the flywheel 14; the reversible motor/generator 17 adopts a direct-current permanent magnet brushless synchronous motor, the working mode is a motor/generator bidirectional reversible type, and the reversible motor/generator has the advantages of simple structure, high operating efficiency and good speed regulation performance; the flywheel energy storage system is also provided with a monitoring instrument for monitoring the rotating speed of the flywheel 14, and the monitoring instrument can also detect the temperature of the first magnetic suspension bearing 15 and the second magnetic suspension bearing 18, the vacuum degree of the vacuum chamber 16 and other parameters, so that the energy stored in the flywheel 14 can be accurately detected.
Embodiment 4, as shown in fig. 2, the utility model provides an implement 3 the use method of battery power boats and ships with flywheel energy storage system, including the following step:
compared with the embodiment 2, the hydrogen fuel battery pack 2 and the dual-fuel engine 21 can supply power to a power grid together, the dual-fuel engine 21 mainly drives the generator 20 to generate power during normal navigation, the power is supplied to a ship power grid through the AC/DC rectifier, when a ship is in heavy load, the hydrogen fuel battery pack 2 and the dual-fuel engine 21 supply power together, the dual-fuel engine 21 provides basic load which is basically unchanged, the engine 21 works at the highest efficiency point, the exceeding load part is provided by the hydrogen fuel battery pack 2, when the load demand power is suddenly increased, the flywheel energy storage system can quickly release energy to meet the load demand, and the hydrogen fuel battery pack 2 is effectively protected.
In the present embodiment, the capacity of the hydrogen fuel cell stack 2 is sufficient for the ship to enter and exit the port, the operation of the engine 21 can be reduced, and the fuel cell stack 2 can be used as a supplement to the daily life load power during port parking, thereby reducing the noise and pollution level in the port area.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.
Claims (7)
1. A battery powered watercraft having a flywheel energy storage system, comprising: the power distribution device comprises a main distribution board and a distribution board, wherein the main distribution board is respectively communicated with the power battery pack, the propulsion system, the flywheel energy storage system and the distribution board which are used for providing power through the power electronic converter, and the distribution board is used for connecting the power load and providing power for the power load;
the flywheel energy storage system comprises a flywheel body, a reversible motor/generator and a vacuum chamber, wherein the reversible motor/generator is coaxial with the flywheel body, the flywheel body and the reversible motor/generator are arranged in the vacuum chamber, and the reversible motor/generator is used for driving the flywheel body to store energy in a rotating manner or driving the reversible motor/generator to generate electricity under the inertial rotation driving of the flywheel body;
when the electric power of the ship on the ship is lower than the power provided by the power battery pack, the main distribution board distributes the electric energy to the flywheel energy storage system to drive the reversible motor/generator to rotate so as to drive the flywheel body to rotate for energy storage;
when the power for the ship on the ship is higher than the power provided by the power battery pack, the flywheel body is driven by inertial rotation to drive the reversible motor/generator to generate power, and the power is transmitted to the main distribution board through the power electronic converter.
2. The battery-powered watercraft with a flywheel energy storage system according to claim 1, characterised in that the power battery is a hydrogen fuel battery and the hydrogen fuel battery is connected with a hydrogen storage tank.
3. The battery powered watercraft having a flywheel energy storage system as set forth in claim 1, wherein the propulsion system includes a propeller and a propulsion motor driving the propeller.
4. The battery powered watercraft having a flywheel energy storage system as set forth in claim 1, wherein a bidirectional converter is provided between the flywheel energy storage system and the main switchboard.
5. The battery powered watercraft with a flywheel energy storage system according to claim 1, characterized in that a fuel power plant is further connected to the main switchboard, and the fuel power plant uses LNG, diesel fuel, or a mixed fuel of LNG and diesel fuel.
6. The battery powered watercraft with a flywheel energy storage system as claimed in claim 1, characterised in that the connecting bus in the main switchboard is a direct current bus or an alternating current bus;
when a connecting bus in the main distribution board adopts a direct current bus, the power battery pack is connected with the main distribution board through a DC/DC converter, the propulsion system is connected with the main distribution board through a frequency converter and a first DC/AC inverter, and the distribution board is connected with the main distribution board through a transformer and a second DC/AC inverter;
when the connecting bus in the main distribution board adopts an alternating current bus, the power battery pack is connected with the main distribution board through a DC/AC inverter, the propulsion system is connected with the main distribution board through a frequency converter and a first AC/AC converter, and the distribution board is connected with the main distribution board through a second AC/AC converter.
7. The battery-powered marine vessel with a flywheel energy storage system of claim 5, wherein the fuel-powered device comprises a generator and a dual-fuel engine, and an AC/DC rectifier is provided between the generator and the main switchboard.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110304228A (en) * | 2019-08-09 | 2019-10-08 | 大连海事大学 | Battery power ship and its application method with flywheel energy storage system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110304228A (en) * | 2019-08-09 | 2019-10-08 | 大连海事大学 | Battery power ship and its application method with flywheel energy storage system |
| CN110304228B (en) * | 2019-08-09 | 2023-12-22 | 大连海事大学 | Battery powered watercraft with flywheel energy storage system and method of use thereof |
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