Slope type caterpillar track gravity energy storage multi-machine system

Abstract

The invention discloses a slope type caterpillar track gravity energy storage multi-machine system, and relates to the technical field of gravity energy storage. Comprising a main system unit, a supporting track laid according to a mountain structure, a chain type mass block dragging device arranged on the supporting track, double-motor assemblies arranged at the two ends of the supporting track, and a control system used for controlling the main system unit to operate in a power mode and a phase modulation mode. By designing a dual-mode operation system of a power mode and a phase modulation mode, dual functions of energy storage and discharge and reactive power regulation are realized, and by arranging an auxiliary motor and a kinetic energy recovery device and combining a staggered arrangement scheme of a heavy-load track and a light-load track, efficient recovery and cyclic utilization of energy in the movement process of the mass block are realized, and the energy utilization rate of the mass block is improved. By establishing a mathematical relationship model of track arrangement and adopting a design scheme of performing dynamic optimization according to mountain characteristics, the operation safety is ensured through an automatic mass block carrying and stacking system.

Description

Technical Field

[0001] The invention relates to the technical field of gravity energy storage, in particular to a slope type chain track gravity energy storage multi-machine system. Background Art

[0002] As global climate change and energy crises intensify, renewable energy, mainly wind and solar energy, has developed rapidly, gradually replacing traditional fossil energy and becoming the main force of future energy development. However, these new energy sources are intermittent and unstable, and cannot fully guarantee the continuity of power supply. This characteristic brings challenges to grid dispatching and power stability. Especially when a high proportion of renewable energy is connected to the grid, the volatility and reliability of the power system are particularly prominent.

[0003] In order to deal with the above problems, large-scale energy storage systems have become a hot topic of research. Energy storage technology can effectively alleviate the instability of renewable energy power generation. By storing electricity during the low period of electricity demand and releasing it during the peak period, it can balance supply and demand and improve the efficiency and stability of the system. At present, pumped storage has become a relatively mature and widely used large-scale physical energy storage technology because of its high efficiency, good economy, long operating life and small impact on the environment. However, pumped storage technology relies on water resources and requires a significant difference in high and low water levels. It is generally only suitable for areas with abundant water resources. In order to solve the dependence of pumped storage technology on water resources, gravity energy storage technology came into being. The principle of gravity energy storage technology is similar to that of pumped storage, except that the energy storage medium is changed from water to a solid mass block, and it has the same characteristics as pumped storage, such as long life and good economy. Against this background, the research and application of gravity energy storage technology is gradually attracting global attention. Governments and enterprises of various countries have also increased their investment in gravity energy storage projects and technology research and development efforts, and are committed to promoting its application in the fields of power grid peak and frequency regulation, power system emergency standby, off-grid energy supply, and combination with renewable energy.

[0004] The main structure of the slope gravity energy storage system generally includes a slope track, a motor, a gearbox, several mass blocks, etc. Such a structural composition makes the working process relatively common and the overall versatility of the system is strong. Therefore, how to design a slope gravity energy storage system suitable for specific scenarios is the key issue to be solved by this energy storage technology. Summary of the invention

[0005] In view of the problems existing in the prior art, the present invention is proposed.

[0006] Therefore, the problem to be solved by the present invention is how to use an electrically excited synchronous generator motor to lay support tracks according to the mountain structure, build a multi-machine system, and use chains as mass block traction devices, and the system supports "power mode" and "phase modulation mode".

[0007] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0008] An embodiment of the present invention provides a slope-type chain-rail gravity energy storage multi-machine system, which includes a main system unit, including a support track laid according to a mountain structure, a chain-type mass block traction device arranged on the support track, a dual motor assembly arranged at both ends of the support track, and a control system for controlling the main system unit to operate in a power mode and a phase modulation mode.

[0009] As a preferred solution of the sloped chain track gravity energy storage multi-machine system described in the present invention, the main system unit includes the following links: a generator motor, a speed change link, a power transmission link, an acceleration and deceleration transition link, a mass block handling and stacking link, and a mass block carrying vehicle circulation operation link.

[0010] As a preferred solution of the slope type chain track gravity energy storage multi-machine system of the present invention, the generator motor link adopts an electrically excited synchronous generator motor with two working modes:

[0011] The power mode includes driving the mass-carrying vehicle up and down the slope track through the speed change link and the power transmission link to meet the charging and discharging requirements;

[0012] The phase adjustment mode includes adjusting the system to absorb or generate reactive power by changing the excitation current of the electrically excited synchronous generator motor.

[0013] As a preferred solution of the slope type chain track gravity energy storage multi-machine system of the present invention, wherein: the speed change link includes a gear box and a sprocket, which converts the high speed and small torque of the motor shaft end into the low speed and large torque of the chain;

[0014] The power transmission link includes a chain and a mass-carrying trolley, which enables the mass to move up and down on the slope and completes the system charging and discharging conditions.

[0015] As a preferred solution of the sloped chain track gravity energy storage multi-machine system of the present invention, wherein: the acceleration and deceleration transition link is composed of an auxiliary motor and a kinetic energy recovery device, and is located in the transition area between the slope track and the upper and lower stacking fields;

[0016] When in the discharge condition, the auxiliary motor is used to pre-accelerate the mass block from 0 m / s to v1, from the upper buffer zone into the ramp track to meet the discharge speed requirement;

[0017] When the mass block completes the discharge condition at a speed of v1, the mass block is decelerated to a stationary state through the auxiliary motor and the kinetic energy recovery device, and the kinetic energy of the deceleration process is fed back to the power grid in the form of electrical energy.

[0018] As a preferred solution of the slope type chain track gravity energy storage multi-machine system of the present invention, wherein: the mass block handling and stacking link includes a mass block carrying vehicle top lifting and moving device, a traveling crane, and an unmanned forklift;

[0019] When the mass block completes the charging and discharging conditions, the overhead crane lifts the mass block from the carrier vehicle, and then the unmanned forklift transports it to the designated stacking position. Then the empty mass block carrier vehicle is lifted by the jacking and transferring device, and returns to the light load track via the horizontal transverse conveyor belt.

[0020] As a preferred solution of the sloped chain track gravity energy storage multi-machine system of the present invention, the circulating operation link of the mass block carrier vehicle includes a certain heavy-load track, a light-load track and a horizontal transverse conveyor belt.

[0021] As a preferred solution of the sloped chain track gravity energy storage multi-machine system of the present invention, the number of light-load tracks [n / 2] (rounded up), the number of heavy-load tracks n and the total number of slope tracks N satisfy the following mathematical relationship:

[0022]

[0023] Wherein, n satisfies n≥1.

[0024] As a preferred solution of the slope type chain track gravity energy storage multi-machine system of the present invention, the track arrangement satisfies the following relationship:

[0025] 2b0+Nb1+(N-1)b2=B

[0026] Among them, B is the horizontal width of the slope mountain area, b0 is the distance between the outer slope chain track and the mountain boundary, b1 is the width of a single slope chain track, and b2 is the spacing between adjacent slope chain tracks.

[0027] As a preferred solution of the slope type chain track gravity energy storage multi-machine system of the present invention, the track arrangement mode of the slope mountain area meets the following characteristics:

[0028] The number of light-load tracks [n / 2], the number of heavy-load tracks n, and the total number of slope tracks N all satisfy:

[0029] N=[n / 2]+n

[0030]

[0031] The track arrangement is as follows: heavy-load tracks and light-load tracks are staggered to form a highly efficient mass block circulation channel;

[0032] The spacing b2 between adjacent slope chain rails is dynamically optimized according to the characteristics of the mountain structure, and the distance b0 between the outer track and the mountain boundary is determined according to the geological conditions;

[0033] Among them, the heavy-load track is responsible for the up and down transportation of the mass blocks, and the light-load track is used for the return trip of the vehicle, thus realizing the efficient circulation operation of the system.

[0034] The beneficial effects of the present invention are as follows: the sloped chain track gravity energy storage multi-machine system provided by the present invention realizes the dual functions of energy storage and release and reactive power regulation by designing a dual-mode operation system of power mode and phase adjustment mode, thereby improving the operation flexibility of the system and improving the grid regulation capability at the same time; by arranging auxiliary motors and kinetic energy recovery devices and combining the staggered arrangement of heavy-load tracks and light-load tracks, efficient energy recovery and recycling during the movement of mass blocks are realized, which not only reduces energy loss but also improves space utilization efficiency and ensures the economy of system operation; by establishing a mathematical relationship model of track layout and adopting a design scheme for dynamic optimization according to mountain characteristics, the system's adaptability to different terrain conditions is improved, and the operation safety is guaranteed by an automated mass block handling and stacking system. The present invention achieves more significant effects in terms of system flexibility, energy efficiency and space utilization. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0036] Figure 1 It is a top view of the slope mountain area of ​​the slope type chain track gravity energy storage multi-machine system;

[0037] Figure 2 It is a side view of the ramp type chain track gravity energy storage multi-machine system;

[0038] Figure 3 This is a schematic diagram of the track implementation of the sloped chain track gravity energy storage multi-machine system. DETAILED DESCRIPTION

[0039] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0040] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0041] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0042] Example 1

[0043] Reference Figure 1 to Figure 3 , which is the first embodiment of the present invention, provides a ramp-type chain rail gravity energy storage multi-machine system, including a main system unit, which can control the chain 108b-type mass block 102 dragging device to move along the slope through the dual motor components arranged at both ends of the support track to achieve the switching operation of the power mode and the phase adjustment mode. The main system unit completes the up and down transportation and energy conversion of the mass block 102 through the coordinated work of the generator motor, the speed change link, the power transmission link, the acceleration and deceleration transition link, the mass block 102 handling and stacking link and the mass block carrier 103 circulation operation link.

[0044] Specifically, the main system unit includes a support track laid according to the mountain structure, a chain-type mass block traction device arranged on the support track, a dual motor assembly arranged at both ends of the support track, and a control system for controlling the main system unit to operate in power mode and phase modulation mode.

[0045] It should be noted that the main system unit mainly includes the following structures: an electrically excited synchronous generator motor, a gear box, a sprocket 108a, a chain 108b, an inclined rail 101, a mass block 102, a mass block carrier vehicle 103, an upper mass block transition zone 201, a lower mass block transition zone 202, a horizontal transverse conveyor belt 104, an auxiliary motor and a kinetic energy recovery device 105, and a mass block handling and stacking device. The mass block carrier vehicle 103 is provided with a carrier vehicle lifting hook 103a, and the mass block carrier vehicle 103 is located in the middle of the two sets of inclined rails 101 and moves in the mass block carrier vehicle circulating track 106.

[0046] Furthermore, the main system unit includes the following links: a generator motor, a speed change link, a power transmission link, an acceleration and deceleration transition link, a mass block transportation and stacking link, and a mass block carrying vehicle circulation operation link.

[0047] Furthermore, the generator motor link adopts an electrically excited synchronous generator motor, which has two working modes:

[0048] The power mode includes driving the mass-carrying vehicle 103 up and down the slope track through the speed change link and the power transmission link to meet the charging and discharging requirements;

[0049] The phase adjustment mode includes adjusting the system to absorb or generate reactive power by changing the excitation current of the electrically excited synchronous generator motor.

[0050] When in use, the power mode works as follows: after the system receives the discharge signal, the electrically excited synchronous generator rotates, and the high-speed small torque at the motor shaft end is converted into a low-speed large torque through the gear box and output to the sprocket 108a and the chain 108b, and the ramp chain track starts to move. At the same time, the unmanned forklift transports the mass block 102 from the upper stacking area 203 to the designated position of the upper platform near the chain track, and then transports it into the mass block carrier 103 through the traveling crane 109. Then the auxiliary motor acts to pre-accelerate the mass block 102 and the mass block carrier 103, so that it reaches the speed of v1 from rest in the upper mass block transition zone 201, enters the ramp chain track and runs downward to the lower mass block transition zone 202, and the auxiliary motor and the kinetic energy recovery device 105 work together to reduce the speed of the mass block 102 from v1 to 0m / s, and convert the kinetic energy of the mass block 102 into electrical energy to feed back to the power grid. Then the mass block 102 is lifted by the lifting and moving device 107, moved from the carrier vehicle by the crane 109 to the designated position of the lower platform, and transported to the lower stacking area 204 by the unmanned forklift. At the same time, the empty carrier vehicle is transported to the light-load track and returned to the upper platform via the horizontal transverse conveyor belt 104, completing a complete discharge process; the charging process is similar to the discharge process, but in the opposite direction, and will not be repeated. When the system is in the "phase adjustment mode", only the electrically excited synchronous generator motor works, and by changing the size of its excitation current, the system absorbs or emits reactive power to complete the phase adjustment work.

[0051] Furthermore, the speed change link includes a gear box and a sprocket 108a, which converts the high speed and low torque of the motor shaft end into the low speed and high torque of the chain 108b;

[0052] The power transmission link includes a chain 108b and a mass-carrying trolley 103, which enables the mass 102 to move up and down on the slope, thereby completing the system charging and discharging conditions.

[0053] Furthermore, the acceleration / deceleration transition link is composed of an auxiliary motor and a kinetic energy recovery device 105, and is located in the transition area between the ramp track and the upper and lower stacking fields;

[0054] When in the discharge condition, the auxiliary motor is used to pre-accelerate the mass block 102, and the speed is accelerated from 0 m / s to v1 from the upper mass block transition area 201 into the ramp track to meet the discharge speed requirement;

[0055] When the mass block 102 completes the discharge condition at the speed v1, the mass block 102 is decelerated to a stationary state through the auxiliary motor and the kinetic energy recovery device 105, and the kinetic energy of the deceleration process is fed back to the power grid in the form of electrical energy.

[0056] Furthermore, the mass block 102 handling and stacking process includes a mass block carrier 103, a lifting and moving device 107, a crane 109, and an unmanned forklift.

[0057] When the mass block 102 completes the charging and discharging conditions, the crane 109 lifts the mass block 102 off the carrier vehicle, and then the unmanned forklift transports it to the designated stacking position. Then the empty mass block carrier vehicle 103 is lifted by the lifting and transferring device 107, passes through the horizontal transverse conveyor belt 104 to reach the light load track and return.

[0058] Furthermore, the circulating operation link of the mass block carrying vehicle 103 includes a certain heavy-load track, a light-load track and a horizontal transverse conveyor belt 104.

[0059] Furthermore, the number of light-load tracks [n / 2] (rounded up), the number of heavy-load tracks n, and the total number of slope tracks N satisfy the following mathematical relationship:

[0060]

[0061] Wherein, n satisfies n≥1.

[0062] It should be noted that the number of multiple tracks of the sloped chain track gravity energy storage system, that is, the number of multiple units, and the number of sloped chain tracks can be determined from this.

[0063] Furthermore, the track arrangement satisfies the following relationship:

[0064] 2b0+Nb1+(N-1)b2=B

[0065] Among them, B is the horizontal width of the slope mountain area, b0 is the distance between the outer slope chain track and the mountain boundary, b1 is the width of a single slope chain track, and b2 is the spacing between adjacent slope chain tracks.

[0066] Furthermore, the track layout in the slope mountain area meets the following characteristics:

[0067] The number of light-load tracks [n / 2], the number of heavy-load tracks n, and the total number of slope tracks N all satisfy:

[0068] N=[n / 2]+n

[0069]

[0070] The track arrangement is as follows: heavy-load tracks and light-load tracks are arranged alternately to form a high-efficiency mass block 102 circulation operation channel;

[0071] The spacing b2 between adjacent slope chain rails is dynamically optimized according to the characteristics of the mountain structure, and the distance b0 between the outer track and the mountain boundary is determined according to the geological conditions;

[0072] Among them, the heavy-load track is used for the up and down transportation of the mass block 102, and the light-load track is used for the return trip of the vehicle, so as to realize the efficient circulation operation of the system.

[0073] It should be noted that, for the upper and lower transition areas of the system, the present invention not only includes the lifting and transferring device 107 and the horizontal transverse conveyor belt 104, but also adds a new design structure: each ramp chain track is equipped with an auxiliary motor and a kinetic energy recovery device 105. The benefit is that the one-way efficiency of the system is improved. The specific process is as follows:

[0074] When the energy storage medium composed of the mass block 102 and the mass block carrier 103 is in a downward discharge condition, the energy storage medium descends on the slope at a speed v1. If the auxiliary motor is not used for pre-acceleration, the efficiency of the one-way discharge condition will be low and the discharge requirements will not be met. An auxiliary motor is added to pre-accelerate the stationary mass block 102 and the mass block carrier 103, so that the energy storage medium reaches the speed of v1 when it enters the slope track, thereby improving the discharge efficiency; the charging process is the same in principle but in the opposite direction, which will not be repeated here. The kinetic energy recovery device 105 is used when the mass block 102 and the carrier complete the discharge condition and arrive at the transition area of ​​the lower platform. The crane 109 lifts the mass block 102 away from the mass block carrier 103. Due to the inertia of the energy storage medium itself, it takes a long time to decelerate to a stationary state. At this time, it cooperates with the auxiliary motor to recover kinetic energy, which not only shortens the deceleration time and ensures the safety of the system, but also converts the kinetic energy recovery into electrical energy to feed back to the power grid. After completing the above working conditions, the unloaded mass block carrier 103 is lifted up by the lifting and transferring device 107, leaves the rail, passes through the horizontal transverse conveyor belt 104 to the light-load track and returns to the upper platform to prepare for the next discharge working condition; the charging process has the same principle and the opposite direction, which will not be repeated here.

[0075] It should also be noted that, for the handling and stacking process of the mass block 102 after the working condition is completed, the present invention provides the following handling and stacking solution: using the crane 109 in conjunction with an unmanned forklift. The advantage is that it solves the shortcomings of the slow stacking of the crane 109 and the slow handling of the unmanned forklift, and improves the overall handling and stacking efficiency of the system. The specific process is as follows:

[0076] Taking the discharge condition as an example, when the system starts the discharge condition, the unmanned forklift transports the mass block 102 in the mass block stacking area in the upper stacking area 203 to a designated position close to the upper mass block transition area 201, and then the mass block 102 is moved into the mass block carrier 103 by the traveling crane 109. After the discharge condition is completed, it arrives at the lower mass block transition area 202, and the traveling crane 109 lifts the mass block 102 from the mass block carrier 103 and transports it to a designated position close to the lower mass block transition area 202, and then the unmanned forklift stacks the mass block 102 to the lower stacking area 204; the charging condition is similar to it, but in the opposite direction, and will not be repeated here.

[0077] In summary, the sloped chain track gravity energy storage multi-machine system provided by the present invention realizes the dual functions of energy storage and release and reactive power regulation by designing a dual-mode operation system of power mode and phase adjustment mode, thereby improving the operation flexibility of the system and improving the grid regulation capability; by arranging auxiliary motors and kinetic energy recovery devices and combining the staggered arrangement of heavy-load tracks and light-load tracks, efficient energy recovery and recycling during the movement of the mass blocks are realized, which not only reduces energy loss but also improves space utilization efficiency and ensures the economy of system operation; by establishing a mathematical relationship model of track layout and adopting a design scheme for dynamic optimization according to the characteristics of the mountain, the system's adaptability to different terrain conditions is improved, and the operation safety is guaranteed by the automated mass block handling and stacking system. The present invention achieves more significant results in terms of system flexibility, energy efficiency and space utilization.

[0078] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A slope type chain track gravity energy storage multi-machine system, characterized in that: include, The main system unit includes a support track laid according to the mountain structure, a chain-type mass block dragging device arranged on the support track, a dual motor assembly arranged at both ends of the support track, and a control system for controlling the main system unit to operate in power mode and phase modulation mode.

2. The slope type chain track gravity energy storage multi-machine system according to claim 1, characterized in that: The main system unit includes the following links: a generator motor, a speed change link, a power transmission link, an acceleration and deceleration transition link, a mass block transportation and stacking link, and a mass block carrying vehicle circulation operation link.

3. The slope type chain track gravity energy storage multi-machine system according to claim 2, characterized in that: The generator motor link adopts an electrically excited synchronous generator motor, which has two working modes: The power mode includes driving the mass-carrying vehicle up and down the slope track through the speed change link and the power transmission link to meet the charging and discharging requirements; The phase adjustment mode includes adjusting the system to absorb or generate reactive power by changing the excitation current of the electrically excited synchronous generator motor.

4. The slope type chain track gravity energy storage multi-machine system according to claim 3, characterized in that: The speed change link includes a gear box and a sprocket, which converts the high speed and low torque of the motor shaft end into the low speed and high torque of the chain; The power transmission link includes a chain and a mass-carrying trolley, which enables the mass to move up and down on the slope and completes the system charging and discharging conditions.

5. The slope type chain track gravity energy storage multi-machine system according to claim 4, characterized in that: The acceleration / deceleration transition link is composed of an auxiliary motor and a kinetic energy recovery device, and is located in the transition area between the ramp track and the upper and lower stacking fields; When in the discharge condition, the auxiliary motor is used to pre-accelerate the mass block from 0 m / s to v1, from the upper buffer zone into the ramp track to meet the discharge speed requirement; When the mass block completes the discharge condition at a speed of v1, the mass block is decelerated to a stationary state through the auxiliary motor and the kinetic energy recovery device, and the kinetic energy of the deceleration process is fed back to the power grid in the form of electrical energy.

6. The slope type chain track gravity energy storage multi-machine system according to claim 5, characterized in that: The mass block handling and stacking process includes a mass block carrying vehicle top lifting and moving device, a traveling crane, and an unmanned forklift; When the mass block completes the charging and discharging conditions, the overhead crane lifts the mass block from the carrier vehicle, and then the unmanned forklift transports it to the designated stacking position. Then the empty mass block carrier vehicle is lifted by the jacking and transferring device, and returns to the light load track via the horizontal transverse conveyor belt.

7. The slope type chain track gravity energy storage multi-machine system according to claim 6, characterized in that: The mass-carrying vehicle cycle operation link includes a certain heavy-load track, a light-load track and a horizontal transverse conveyor belt.

8. The slope type chain track gravity energy storage multi-machine system according to claim 7, characterized in that: The number of light-load tracks [n / 2] (rounded up), the number of heavy-load tracks n, and the total number of ramp tracks N satisfy the following mathematical relationship: Wherein, n satisfies n≥1.

9. The slope type chain track gravity energy storage multi-machine system according to claim 8, characterized in that: The track arrangement satisfies the following relationship: 2b0+Nb1+(N-1)b2=B Among them, B is the horizontal width of the slope mountain area, b0 is the distance between the outer slope chain track and the mountain boundary, b1 is the width of a single slope chain track, and b2 is the spacing between adjacent slope chain tracks.

10. The slope type chain track gravity energy storage multi-machine system according to claim 9, characterized in that: The track layout in the slope mountain area meets the following characteristics: The number of light-load tracks [n / 2], the number of heavy-load tracks n, and the total number of slope tracks N all satisfy: N=[n / 2]+n The track arrangement is as follows: heavy-load tracks and light-load tracks are staggered to form a highly efficient mass block circulation channel; The spacing b2 between adjacent slope chain rails is dynamically optimized according to the characteristics of the mountain structure, and the distance b0 between the outer track and the mountain boundary is determined according to the geological conditions; Among them, the heavy-load track is responsible for the up and down transportation of the mass blocks, and the light-load track is used for the return trip of the vehicle, thus realizing the efficient circulation operation of the system.

Images