CN109882348B - Electric energy storage device and control method thereof - Google Patents
Electric energy storage device and control method thereof Download PDFInfo
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- CN109882348B CN109882348B CN201910218347.6A CN201910218347A CN109882348B CN 109882348 B CN109882348 B CN 109882348B CN 201910218347 A CN201910218347 A CN 201910218347A CN 109882348 B CN109882348 B CN 109882348B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
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Abstract
The invention relates to the technical field of energy sources, and discloses an electric energy storage device and a control method thereof. The electrical energy storage device includes: the device comprises a motor, a controller and a transmission mechanism; the controller is respectively connected with the motor and each group of transmission mechanisms in a control way; the transmission mechanism comprises a floating body, a transmission chain, a locking mechanism and a first bearing; the first bearing is fixedly arranged at the bottom of the water; one end of the transmission chain is connected with the floating body, and the other end of the transmission chain bypasses the first bearing and is connected with the motor; the locking mechanism is used for locking or unlocking the transmission chain according to the instruction; the motor is used for driving the transmission chain to pull the floating body down to the water bottom in a motor working mode; in the working mode of the generator, the motor is driven by the transmission chain to generate electricity in the process that the floating body rises due to buoyancy; and the controller is used for controlling the transmission mechanism and the motor according to different working conditions. The embodiment of the invention utilizes the buoyancy of water to store energy, and has the advantages of low cost, no adverse effect on ecological environment, high energy conversion efficiency and the like.
Description
Technical Field
The present disclosure relates to energy technologies, and particularly to an electric energy storage device and a control method thereof.
Background
The production, delivery and use of electricity occur simultaneously and are generally not storable, while the demand of the electrical load is changing instantaneously. During the day, the power demand is high during the day and the first half of the night (where the highest period is called the peak), and falls down significantly during the next half of the night (where the lowest period is called the valley), which sometimes is half the peak or even less. In view of this, the power generation equipment is fully charged during peak load periods and is forced down during low peak load periods, even temporarily shut down, and a series of measures are taken to coordinate use of the relevant power generation equipment with respect to power demand.
The pumped storage power station is generated for solving the contradiction between supply and demand between peak and valley of the power grid, and is a mode for indirectly storing electric energy. The water pump is driven by surplus electric power in the load valley, water is pumped from a lower reservoir to an upper reservoir for storage, and then the water is discharged to generate electricity in the load peak and flows into the lower reservoir. Therefore, the pumped storage power station is mainly constructed for matching with a nuclear power plant, and the surplus inexhaustible electric energy output by the nuclear power plant during power generation is stored in the form of water.
However, this pumped-storage system has the following drawbacks:
1) In the whole operation process, part of energy can be lost between the conversion, and the energy conversion ratio of the medium-and-large-sized pumped storage power station can only reach about 70 percent according to the operation practice of the world pumped storage power station;
2) The construction of the pumped storage power station requires harsh conditions, is generally selected to be located in remote valleys, is far away from the nuclear power station, and is high in cost and inconvenient to dispatch.
Disclosure of Invention
The invention aims to provide an electric energy storage device and a control method thereof, which overcome the defects of high input cost and high energy loss of the existing water pumping and energy storage mode.
To achieve the purpose, the invention adopts the following technical scheme:
an electrical energy storage device comprising: the device comprises a motor, a controller and at least one group of transmission mechanisms; the controller is respectively connected with the motor and each group of transmission mechanisms in a control way;
the transmission mechanism comprises a floating body, a transmission chain, a locking mechanism and a first bearing;
the first bearing is fixedly arranged at the water bottom of a first preset depth through a first bearing seat;
one end of the transmission chain is connected with the floating body, and the other end of the transmission chain bypasses the first bearing and is connected with the motor;
the locking mechanism is connected with the transmission chain and used for locking the transmission chain when a locking instruction is received, so that the transmission chain is not movable; stopping locking the transmission chain when an unlocking instruction is received, so that the transmission chain can move when being stressed;
the motor is provided with two working modes of a generator and a motor; in the working mode of the motor, the motor is used for driving the transmission chain to pull the floating body down to the water bottom; in the working mode of the generator, the motor is driven by the transmission chain to generate power in the process that the floating body rises due to buoyancy;
the controller is used for controlling the motor to switch to a motor working mode when electric energy is stored, so that the motor pulls down the floating body to the water bottom through the transmission chain, and sending a locking instruction to the locking mechanism when the floating body is pulled down to a second preset depth; and the locking mechanism is also used for controlling the motor to switch to a working mode of the generator when the electric energy is released, and sending an unlocking instruction to the locking mechanism so that the transmission chain can be driven by the floating body which floats upwards, and then the motor is driven to generate electricity.
Optionally, the controller is further configured to control the depth of the floating body pulled down through the locking mechanism according to a preset energy storage level.
Optionally, the controller is further configured to control the floating height of the floating body through the locking mechanism according to a preset energy release level.
Optionally, the number of the transmission mechanisms is at least two.
Optionally, the controller is further configured to control the number of the floating bodies that are pulled down through a locking mechanism of the designated number of transmission mechanisms according to a preset energy storage level.
Optionally, the controller is further configured to control the number of floating bodies floating upwards through a locking mechanism of a designated number of transmission mechanisms according to the energy release level.
Optionally, the floating body is a buoyancy tank or a pontoon.
A control method of an electrical energy storage device as claimed in any one of the preceding claims, the control method comprising the steps of storing electrical energy and releasing electrical energy;
the step of storing electrical energy includes: the motor is controlled to be switched to a motor working mode, the motor pulls down the floating body to the water bottom through the transmission chain, and the locking mechanism is controlled to lock the transmission chain when the floating body is pulled down to a second preset depth;
the step of releasing the electric energy includes: the motor is controlled to be switched to a working mode of the generator, and an unlocking instruction is sent to the locking mechanism, so that the transmission chain can be driven by the floating body which floats upwards, and the motor is driven to generate electricity.
Optionally, the power generation control method further includes: according to a preset energy storage level, controlling the pulled-down depth of the floating body through a locking mechanism; and/or controlling the floating height of the floating body through the locking mechanism according to the preset energy release level.
Optionally, when the number of the transmission mechanisms is at least two, the power generation control method further includes:
controlling the number of the floating bodies which are pulled down through locking mechanisms of a designated number of transmission mechanisms according to a preset energy storage level; and/or controlling the number of floating bodies floating upwards through the locking mechanisms of the designated number of transmission mechanisms according to the preset energy release level.
Compared with the prior art, the embodiment of the invention has the following beneficial effects:
different from the traditional pumped storage mode, the embodiment of the invention stores energy by utilizing the buoyancy of water, and the electric energy is stored and released by directly linking the motor through the transmission chain and the floating body, when the device is applied, the device is only required to be arranged at a place with a deeper water area near the coast, and can be more economically and reasonably separated from a nuclear power plant, so that a great amount of manpower, material resources and financial resources are not required to be input, any adverse effect is not caused to the ecological environment, the energy loss can be reduced, and the energy conversion efficiency is greatly improved.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that other drawings can be obtained from these drawings without inventive faculty for a person skilled in the art.
Fig. 1 is a schematic structural diagram of an electrical energy storage device according to an embodiment of the invention.
Detailed Description
In order to make the objects, features and advantages of the present invention more comprehensible, the technical solutions in the embodiments of the present invention are described in detail below with reference to the accompanying drawings, and it is apparent that the embodiments described below are only some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The technical scheme of the invention is further described below by the specific embodiments with reference to the accompanying drawings.
Example 1
Referring to fig. 1, fig. 1 is an electrical energy storage device according to the present embodiment, which mainly includes: the motor 1, a controller (not shown in the figure) and a transmission mechanism, wherein the controller is respectively connected with the transmission mechanism and the motor 1 in a control way.
The transmission mechanism comprises a floating body 2, a transmission chain 3, a locking mechanism 4, a first bearing 5 and a second bearing 6.
The first bearing 5 is fixedly arranged on the water bottom with the preset depth through a first bearing 5 seat, and the second bearing 6 is fixedly arranged at a position above the horizontal plane through a second bearing 6 seat.
One end of the transmission chain 3 is connected with the floating body 2, and the other end is connected with the motor 1 after bypassing the first bearing 5 and the second bearing 6 in sequence, so as to realize the transmission function.
The locking mechanism 4 is connected with the transmission chain 3 and is used for locking the transmission chain 3 when a locking instruction is received so that the transmission chain 3 is not movable; when an unlocking instruction is received, the transmission chain 3 stops locking, so that the transmission chain 3 can move when being stressed.
The floating body 2 is a variety of objects capable of floating on the water surface, such as a buoyancy tank or a pontoon, and the structure and materials are not particularly limited.
An electric machine 1 having two modes of operation, a generator and a motor. Under the working mode of the motor, the transmission chain 3 is driven to pull the floating body 2 down to a certain depth of the water bottom; in the working mode of the generator, the floating body 2 is driven by the transmission chain 3 to generate electricity in the process of rising due to buoyancy.
And the controller is used for controlling the motor 1 and the locking mechanism 4 according to different working conditions. When energy storage is needed, the motor 1 is controlled to be switched to a motor working mode, so that the motor 1 pulls down the floating body 2 to the water bottom through the transmission chain 3, and a locking instruction is sent to the locking mechanism 4 when the floating body 2 is pulled down to a specified depth so as to lock the transmission chain 3; when electric energy is required to be released, the motor 1 is controlled to be switched to a generator working mode, and an unlocking instruction is sent to the locking mechanism 4, so that the transmission chain 3 can be driven by the floating body 2 which floats upwards, and the motor 1 is driven to generate electricity.
The working process of the electric energy storage device is as follows: at the initial moment, the floating body 2 is positioned at the water bottom, and the locking mechanism 4 locks the transmission chain 3; when power generation is needed, the motor 1 is switched to a power generator working mode, the locking mechanism 4 is unlocked, the floating body 2 floats upwards due to buoyancy, the transmission chain 3 moves under the drive of the floating body 2, and in the process, the motor 1 is driven by the transmission chain 3 to generate power; when energy storage is needed, the motor 1 is converted into a motor working mode, the motor 1 pulls down the floating body 2 floating to the water surface to the water bottom through the transmission chain 3, and the transmission chain 3 is locked by the locking mechanism 4 when the floating body 2 is pulled down in place.
Because the greater the drawing-down degree of the floating body 2 is, the more energy is stored, when the energy is stored, the controller can control the drawing-down depth of the floating body 2 through the locking mechanism 4 according to the energy storage grade so as to meet the energy storage requirements in different application scenes.
In addition, as the floating body 2 floats up to a higher level, the released energy is larger, and the generated energy of the motor 1 is more, the controller can control the floating body 2 to float up to a higher level through the locking mechanism 4 according to the released energy level during power generation, so as to meet the released energy requirements in different application scenes.
Of course, in practical application, the two control modes can be flexibly combined for application.
In summary, unlike the traditional energy storage mode using water potential, the embodiment uses the buoyancy of water to store energy, and the electric energy is stored and released by directly linking the motor 1 with the floating body 2 through the transmission chain 3, and when the energy storage device is applied, the embodiment only needs to be installed in a place with a deeper water area near the coast, so that a great amount of manpower, material resources and financial resources are not required to be input, any adverse effect is not caused to the ecological environment, energy loss can be reduced, and energy conversion efficiency is greatly improved.
Example two
The electric energy storage device provided in this embodiment mainly includes: the motor 1, the controller and at least two groups of transmission mechanisms are connected with the motor 1 and each group of transmission mechanisms in a control mode respectively.
Each group of transmission mechanism comprises a floating body 2, a transmission chain 3, a locking mechanism 4, a first bearing 5 and a second bearing 6. The first bearing 5 is arranged on the water bottom with the preset depth through a first bearing 5 seat, and the second bearing 6 is fixedly arranged at a position above the horizontal plane through a second bearing 6 seat. One end of the transmission chain 3 is connected with the floating body 2, and the other end is connected with the motor 1 after bypassing the first bearing 5 and the second bearing 6 in sequence, so as to realize the transmission function. The locking mechanism 4 is connected with the transmission chain 3 and is used for locking the transmission chain 3 when a locking instruction is received so that the transmission chain 3 is not movable; when an unlocking instruction is received, the transmission chain 3 stops locking, so that the transmission chain 3 can move when being stressed. The floating body 2 is a variety of objects capable of floating on the water surface, such as a buoyancy tank or a pontoon, and the structure and materials are not particularly limited.
An electric machine 1 having two modes of operation, a generator and a motor. Under the working mode of the motor, a transmission chain 3 of a designated transmission mechanism is driven to pull down the floating body 2 to the water bottom; in the working mode of the generator, the floating body 2 of the designated transmission mechanism is driven by the transmission chain 3 to generate electricity in the process of rising due to buoyancy.
And the controller is used for respectively controlling the motor 1 and the locking mechanism 4 of each group of transmission mechanisms. When energy storage is needed, the motor 1 is controlled to be switched to a motor working mode, so that the motor 1 pulls down the floating body 2 to the water bottom through a transmission chain 3 of a designated transmission mechanism, and sends a locking instruction to the locking mechanism 4 when the floating body 2 is pulled down to a designated depth so as to lock the transmission chain 3; when electric energy is required to be released, the motor 1 is controlled to be switched to a generator working mode, and an unlocking instruction is sent to the locking mechanism 4 of the appointed transmission mechanism, so that the transmission chain 3 can be driven by the floating body 2 which floats upwards, and the motor 1 is driven to generate electricity. Wherein the number of transmission mechanisms is specified to be any number that does not exceed the total number of transmission mechanisms.
In this embodiment, each group of transmission mechanisms may be connected in parallel and then connected to a controller, and the controller sends the same or different control instructions to each group of transmission mechanisms respectively; the transmission mechanisms of all groups can be connected in series and then connected with the controller, and the controller uniformly sends the same control instruction.
The more the number of floating bodies 2 that are pulled down to the water bottom, the more energy is stored; the larger the number of floating bodies 2, the more energy is released, and the larger the pulling force to the motor 1, so that the larger the power generation amount of the motor 1.
Therefore, in the case of the electric energy storage device of the embodiment including multiple groups of transmission mechanisms, the controller thereof can control the number of the floating bodies 2 which are pulled down through the locking mechanisms 4 of the designated number of the transmission mechanisms according to the energy storage level, so as to meet the energy storage requirements in different application scenes; the number of floating bodies 2 floating up can be controlled through the locking mechanism 4 of the designated number of transmission mechanisms according to the energy release level, so that the energy release requirements in different application scenes can be met.
Of course, in practical application, the two control modes can be flexibly combined for application.
In summary, compared with the first embodiment, the second embodiment uses multiple sets of transmission mechanisms to store or release energy, so that not only can the energy storage capacity be improved, but also the energy storage capacity can be flexibly adjusted according to requirements.
Example III
Based on the electric energy storage device provided in the first and second embodiments, the present embodiment provides a control method including a step of storing electric energy and a step of releasing electric energy.
Wherein the step of storing electrical energy comprises: the motor 1 is controlled to be switched to a motor working mode, the motor 1 pulls down the floating body 2 to the water bottom through the transmission chain 3, and the locking mechanism 4 is controlled to lock the transmission chain 3 when the floating body 2 is pulled down to a second preset depth;
the step of releasing electrical energy includes: the motor 1 is controlled to be switched to a generator working mode, and an unlocking instruction is sent to the locking mechanism 4, so that the transmission chain 3 can be driven by the floating body 2 which floats upwards, and the motor 1 is driven to generate power.
According to a preset energy storage level, the depth of the floating body 2 pulled down is controlled through the locking mechanism 4; and/or controlling the floating height of the floating body 2 through the locking mechanism 4 according to the preset energy release level.
Because the greater the drawing-down degree of the floating body 2 is, the more energy is stored, in the step of storing electric energy, the drawing-down depth of the floating body 2 can be controlled through the locking mechanism 4 according to the preset energy storage level, so as to meet the energy storage requirements in different application scenes.
Correspondingly, as the floating body 2 floats up to a higher level, the released energy is larger, and the generated energy of the motor is more, in the step of releasing the electric energy, the floating body 2 can be controlled to a higher level through the locking mechanism 4 according to the preset energy releasing level, so that the energy releasing requirements in different application scenes can be met.
Meanwhile, as the number of the floating bodies 2 which are pulled down to the water bottom is larger, the stored energy is larger, in the step of storing the electric energy, the number of the pulled-down floating bodies 2 can be controlled through the locking mechanisms 4 of the designated number of the transmission mechanisms according to the preset energy storage grade, so that the energy storage requirements under different application scenes can be met.
Accordingly, since the larger the number of floating bodies 2 floating upward, the more energy is released, the more pulling force to the motor, so that the larger the power generation amount of the motor. Therefore, in the step of releasing electric energy, the number of floating bodies 2 floating upwards can be controlled through the locking mechanism 4 of the designated number of transmission mechanisms according to the preset energy release level so as to meet the energy release requirements in different application scenes.
In summary, the power generation control method provided by the embodiment can flexibly adjust the number of floating bodies 2 floating upwards/downwards and/or the floating distance/downwards of each floating body 2 according to the stored energy or released energy, meets various application requirements, and has the advantages of low cost, small energy consumption loss, strong flexibility and the like.
The above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (8)
1. An electrical energy storage device; characterized in that the electrical energy storage device comprises: the device comprises a motor, a controller and at least one group of transmission mechanisms; the controller is respectively connected with the motor and each group of transmission mechanisms in a control way;
the transmission mechanism comprises a floating body, a transmission chain, a locking mechanism and a first bearing;
the first bearing is fixedly arranged at the water bottom of a first preset depth through a first bearing seat;
one end of the transmission chain is connected with the floating body, and the other end of the transmission chain bypasses the first bearing and is connected with the motor;
the locking mechanism is connected with the transmission chain and used for locking the transmission chain when a locking instruction is received, so that the transmission chain is not movable; stopping locking the transmission chain when an unlocking instruction is received, so that the transmission chain can move when being stressed;
the motor is provided with two working modes of a generator and a motor; in the working mode of the motor, the motor is used for driving the transmission chain to pull the floating body down to the water bottom; in the working mode of the generator, the motor is driven by the transmission chain to generate power in the process that the floating body rises due to buoyancy;
the controller is used for controlling the motor to switch to a motor working mode when electric energy is stored, so that the motor pulls down the floating body to the water bottom through the transmission chain, and sending a locking instruction to the locking mechanism when the floating body is pulled down to a second preset depth; when the electric energy is released, the motor is controlled to be switched to a working mode of the generator, and an unlocking instruction is sent to the locking mechanism, so that the transmission chain can be driven by the floating body which floats upwards, and the motor is driven to generate electricity;
the controller is also used for controlling the depth of the floating body pulled down through the locking mechanism according to the preset energy storage level;
the controller is also used for controlling the floating height of the floating body through the locking mechanism according to the preset energy release level.
2. An electrical energy storage device as in claim 1 wherein the number of drive mechanisms is at least two.
3. The electrical energy storage device of claim 2, wherein the controller is further configured to control the number of floating bodies pulled down by a designated number of locking mechanisms of the transmission mechanism based on a preset energy storage level.
4. The electrical energy storage device of claim 2, wherein the controller is further configured to control the number of floating bodies floating by a designated number of locking mechanisms of the transmission mechanism based on the energy release level.
5. The electrical energy storage device of claim 1, wherein the float is a pontoon or pontoon.
6. A control method of an electric energy storage device according to any one of claims 1 to 5, characterized in that the control method comprises a step of storing electric energy and a step of discharging electric energy;
the step of storing electrical energy includes: the motor is controlled to be switched to a motor working mode, the motor pulls down the floating body to the water bottom through the transmission chain, and the locking mechanism is controlled to lock the transmission chain when the floating body is pulled down to a second preset depth;
the step of releasing the electric energy includes: the motor is controlled to be switched to a working mode of the generator, and an unlocking instruction is sent to the locking mechanism, so that the transmission chain can be driven by the floating body which floats upwards, and the motor is driven to generate electricity.
7. The control method according to claim 6, characterized in that the control method further comprises: according to a preset energy storage level, controlling the pulled-down depth of the floating body through a locking mechanism; and/or controlling the floating height of the floating body through the locking mechanism according to the preset energy release level.
8. The control method according to claim 6, characterized in that when the number of the transmission mechanisms is at least two groups, the control method further comprises:
controlling the number of the floating bodies which are pulled down through locking mechanisms of a designated number of transmission mechanisms according to a preset energy storage level; and/or controlling the number of floating bodies floating upwards through the locking mechanisms of the designated number of transmission mechanisms according to the preset energy release level.
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