Mechanical energy storage system step-by-step charging and discharging method based on asymmetric balancing weights, storage medium and equipment

Abstract

The invention discloses a step-by-step charging and discharging method for a mechanical energy storage system based on an asymmetric balancing weight, a storage medium and equipment, the mass of the balancing weight in the mechanical energy storage system is greater than that of an elevator, the asymmetric balancing weight is formed, and the power of a driving motor and the power consumption are reduced; in the energy storage and charging process of the mechanical energy storage system, an elevator carrying a gravity block is lifted to a first designated floor in the mechanical energy storage system at a constant speed, and the constant-speed descending process of a balancing weight serves as a first energy storage and charging stage; after the gravity block is lifted, the elevator independently descends from the first designated floor at a constant speed, and the process that the balancing weight ascends at the constant speed serves as a second energy storage charging stage; in the discharging process of the mechanical energy storage system, the elevator carries the gravity block to fall to a second designated floor in the mechanical energy storage system at a constant speed, and the constant-speed rising process of the balancing weight serves as a first discharging stage; and after the gravity block falls, the elevator is independently lifted from a second designated floor at a constant speed, and the process that the balancing weight falls at a constant speed serves as a second discharging stage.

Description

Technical Field

[0001] The present invention relates to the technical field of mechanical energy storage charging and discharging, and in particular to a step-by-step charging and discharging method, storage medium and equipment for a mechanical energy storage system based on an asymmetric counterweight. Background Art

[0002] Symmetrical counterweights are used in existing mechanical energy storage systems, that is, a lift and a counterweight are arranged on both sides of the traction shaft, and the weight of the lift and the counterweight need to be equal, or a lift is arranged on each side of the traction shaft, and the deadweight of the lifts on both sides of the traction shaft needs to be equal. When the above two mechanical energy storage systems are charging or discharging, the resistance that the mechanical energy storage system needs to overcome is the weight of the gravity block. To ensure safety, the deadweight of the drive motor and the lift needs to be large enough to ensure the traction coefficient and driving force safety, which requires a larger driving power. At the same time, when the existing mechanical energy storage system is performing energy storage and charging, it first completes a heavy-load lifting process. At this time, the mechanical energy storage system stores energy at full power. After the lifting is completed, the empty elevator needs to drop back to a low position for the second cycle. This descent process does not store energy, and a certain amount of electricity is required to overcome the friction resistance of the equipment. Therefore, this energy storage process is composed of a full-power energy storage plus an extremely low-power power consumption process. The power consumption curve of the mechanical energy storage system is composed of a high-power curve and an almost zero power curve, which brings great volatility to the power grid. Similarly, the discharge process of the mechanical energy storage system is also composed of a high-power power generation curve and an almost zero power consumption curve, and the power generation power is also extremely volatile. Summary of the invention

[0003] In response to the problems existing in the prior art, the present invention provides a step-by-step charging and discharging method, storage medium and equipment for a mechanical energy storage system based on an asymmetric counterweight. An asymmetric counterweight is used to realize step-by-step charging and discharging of the mechanical energy storage system, reduce the torque of the drive motor, and thus reduce the power and energy consumption of the drive motor.

[0004] To achieve the above technical objectives, the present invention adopts the following technical solutions: a step-by-step charging and discharging method of a mechanical energy storage system based on an asymmetric counterweight, characterized in that the mass of the counterweight in the mechanical energy storage system is greater than the mass of the elevator, constituting an asymmetric counterweight;

[0005] During the energy storage and charging process of the mechanical energy storage system, the elevator carrying the gravity block is uniformly lifted to the first designated floor of the mechanical energy storage system, and the process of the counterweight block uniformly descending is used as the first energy storage and charging stage; after the gravity block is lifted, the elevator alone descends at a uniform speed from the first designated floor, and the process of the counterweight block uniformly rising is used as the second energy storage and charging stage;

[0006] During the discharge process of the mechanical energy storage system, the elevator carrying the gravity block falls at a uniform speed to the second designated floor in the mechanical energy storage system, and the process of the counterweight block rising at a uniform speed is regarded as the first discharge stage; after the gravity block falls, the elevator alone rises at a uniform speed from the second designated floor, and the process of the counterweight block falling at a uniform speed is regarded as the second discharge stage.

[0007] Furthermore, the mass of the counterweight block is the sum of the mass of the elevator and 1 / 2 of the mass of the gravity block.

[0008] Furthermore, in the first energy storage charging stage, when the motor in the mechanical energy storage system drives the elevator carrying the gravity block to rise, the driving torque T generated on the traction shaft 1a for:

[0009]

[0010] Wherein, Mb represents the mass of the gravity block, r represents the radius of the traction shaft, and g represents the gravitational acceleration.

[0011] Furthermore, in the second energy storage charging stage, the driving torque T generated on the traction shaft when the motor in the mechanical energy storage system drives the counterweight to rise is 1b for:

[0012]

[0013] Wherein, Mb represents the mass of the gravity block, r represents the radius of the traction shaft, and g represents the gravitational acceleration.

[0014] Furthermore, in the first discharge stage, the load torque T generated on the traction shaft when the motor in the mechanical energy storage system drives the elevator carrying the gravity block to descend 2a for:

[0015]

[0016] Wherein, Mb represents the mass of the gravity block, r represents the radius of the traction shaft, and g represents the acceleration due to gravity.

[0017] Furthermore, in the second discharge stage, the load torque T generated on the traction shaft when the motor in the mechanical energy storage system drives the counterweight to descend is 2b for:

[0018]

[0019] Wherein, Mb represents the mass of the gravity block, r represents the radius of the traction shaft, and g represents the gravitational acceleration.

[0020] Furthermore, the first designated floor refers to the floor range corresponding to when all the gravity blocks are lifted to the top of the mechanical energy storage system.

[0021] Furthermore, the second designated floor refers to the floor range corresponding to when all the gravity blocks fall to the bottom of the mechanical energy storage system.

[0022] Furthermore, the present invention also provides a computer-readable storage medium storing a computer program, wherein the computer program enables a computer to execute the step-by-step charging and discharging method of a mechanical energy storage system based on an asymmetric counterweight.

[0023] Furthermore, the present invention also provides an electronic device, comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, the step-by-step charging and discharging method of the mechanical energy storage system based on the asymmetric counterweight block is implemented.

[0024] Compared with the prior art, the present invention has the following beneficial effects: the step-by-step charging and discharging method of the mechanical energy storage system based on the asymmetric counterweight block of the present invention reduces the driving torque of the driving motor and reduces power consumption through the design of the asymmetric counterweight block, thereby reducing the equipment cost of the mechanical energy storage system; at the same time, the present invention decomposes the energy storage charging or discharging process into two stages, thereby reducing the driving power of the driving motor, reducing power consumption, and the smoothness of the electric energy output to the outside is better and the electric energy quality is higher. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a partial schematic diagram of the mechanical energy storage structure;

[0026] Figure 2 It is a flow chart of the step-by-step charging and discharging method of the mechanical energy storage system based on the asymmetric counterweight block of the present invention;

[0027] Figure 3 The power consumption curve of the mechanical energy storage system based on the asymmetric counterweight block in the step-by-step charging process of the present invention;

[0028] Figure 4 The power consumption curve of the traditional mechanical energy storage system during the charging process;

[0029] Figure 5 The power consumption curve of the mechanical energy storage system based on the asymmetric counterweight block of the present invention during the step-by-step discharge process;

[0030] Figure 6 It is the power consumption curve of the traditional mechanical energy storage system during the discharge process;

[0031] Among them, 1-lifting elevator, 2-counterweight block, 3-traction shaft, 4-traction belt, 5-gravity block. DETAILED DESCRIPTION

[0032] The technical solution of the present invention is further explained below in conjunction with the accompanying drawings.

[0033] like Figure 1 The mechanical energy storage system includes: an elevator 1, a counterweight 2, a traction shaft 3, a traction belt 4 and a gravity block 5. One end of the traction belt 4 is fixedly connected to the elevator 1, and the other end of the traction belt 4 is fixedly connected to the counterweight 2 after passing through the traction shaft 3. Under the rotation of the traction shaft 3, the elevator 1 drives the gravity block 5 to move up and down, and the counterweight 2 makes the opposite movement, thereby realizing the energy storage charging and discharging process of the mechanical energy storage system.

[0034] In the mechanical energy storage system of the present invention, the mass of the counterweight 2 is greater than the mass of the elevator 1, forming an asymmetric counterweight. In the present invention, the mass of the counterweight 2 is the sum of the mass of the elevator 1 and 1 / 2 of the mass of the gravity block 5. Therefore, the difference between the mass of the counterweight 2 and the mass of the elevator 1 is half of the rated load, i.e., the mass of the gravity block. When the elevator 1 is fully loaded and unloaded, the driving torque of the traction shaft 3 is the same in magnitude but opposite in direction, and the driving torque is half of the driving torque of the existing symmetrical counterweight form, so that a smaller motor can be used to drive the rotation of the traction shaft 3, thereby reducing the cost of the mechanical energy storage system.

[0035] like Figure 2 The step-by-step charging and discharging method of the mechanical energy storage system of the present invention is as follows:

[0036] During the energy storage and charging process of the mechanical energy storage system, the elevator 1 carrying 5 gravity blocks is uniformly lifted to the first designated floor of the mechanical energy storage system, and the counterweight block 2 is uniformly lowered as the first energy storage and charging stage, wherein the first designated floor refers to the floor range corresponding to when all the gravity blocks are lifted to the top of the mechanical energy storage system; after the gravity blocks are lifted, the elevator alone descends at a uniform speed from the first designated floor, and the counterweight block is uniformly raised as the second energy storage and charging stage.

[0037] In the first energy storage charging stage, the elevator 1 lifts the weight block 5. At this time, the traction shaft 3 is driven by the motor and rotates counterclockwise. The driving motor generates a counterclockwise driving torque, which is defined as a positive torque. Therefore, the driving torque T generated on the traction shaft when the motor in the mechanical energy storage system drives the elevator carrying the weight block to rise is 1a for:

[0038]

[0039] Wherein, Mb represents the mass of the gravity block, r represents the radius of the traction shaft, and g represents the acceleration of gravity; in the first energy storage charging stage, the driving motor can achieve the lifting of the gravity block 5 with half of the rated torque.

[0040] In the second energy storage charging stage, the unloaded elevator 1 descends. At this time, the traction shaft 3 is driven by the motor and rotates clockwise. The driving motor generates a clockwise driving torque, which is defined as the auxiliary torque. Therefore, the driving torque T generated on the traction shaft when the motor drives the counterweight to rise in the mechanical energy storage system is 1b for:

[0041]

[0042] Among them, Mb represents the mass of the gravity block, r represents the radius of the traction shaft, and g represents the acceleration of gravity; since the mass of the counterweight block 2 exceeding the deadweight of the elevator 1 is half the mass of the gravity block 5, the drive motor still needs to use half of the rated torque to lift the counterweight block 2.

[0043] In the first energy storage charging stage, the traditional mechanical energy storage system uses a symmetrical counterweight, and the load torque T = Mb × r × g, such as Figure 3 The energy storage charging process in the mechanical energy storage system of the asymmetric counterweight block of the present invention is decomposed into two stages, and the torque of each energy storage charging process is half of T, thereby reducing power consumption, and the energy storage power of the two energy storage charging stages is equal, which greatly reduces the volatility of electric energy, thereby improving the overall power quality; Figure 4 , the traditional mechanical energy storage system is in an extremely low useless work stage in the second energy storage charging stage, and cannot store energy, resulting in large fluctuations in grid power.

[0044] During the discharge process of the mechanical energy storage system, the elevator carrying the gravity block falls at a uniform speed to the second designated floor in the mechanical energy storage system, and the counterweight block rises at a uniform speed as the first discharge stage, wherein the second designated floor refers to the floor range corresponding to when all the gravity blocks fall to the bottom of the mechanical energy storage system; after the gravity block falls, the elevator alone rises at a uniform speed from the second designated floor, and the counterweight block descends at a uniform speed as the second discharge stage.

[0045] In the first discharge stage, the load torque T generated by the motor in the mechanical energy storage system driving the elevator carrying the weight block on the traction shaft 1b for:

[0046]

[0047] Wherein, Mb represents the mass of the gravity block, r represents the radius of the traction shaft, and g represents the acceleration of gravity. In the first discharge stage, the driving motor can achieve the falling of the gravity block 5 with half of the rated torque.

[0048] In the second discharge stage, the difference between the weight of the counterweight block 2 and the deadweight of the elevator 1 generates a torque that drives the motor to rotate in a counterclockwise direction. Therefore, the load torque T generated by the motor driving the counterweight block on the traction shaft in the mechanical energy storage system is2b for:

[0049]

[0050] Wherein, Mb represents the mass of the gravity block, r represents the radius of the traction shaft, and g represents the acceleration of gravity. In the second discharge stage, the drive motor needs to use half of the rated torque to make the counterweight block 2 fall.

[0051] like Figure 5 The present invention is based on the mechanical energy storage system of asymmetric counterweight block. The step-by-step charging and discharging method is divided into two stages during the discharge process, thereby reducing the driving power of the driving motor and reducing power consumption. Although the driving torque directions of the first discharge stage and the second discharge stage are opposite, the electric energy generated can be converted by the four-quadrant inverter into electric energy that meets the requirements of the power grid, and the smoothness of the electric energy output to the outside is better and the electric energy quality is high. Figure 6 In the second discharge stage, the traditional symmetrical mechanical energy storage system not only does not generate electricity, but also still consumes a certain amount of electrical energy to drive the equipment.

[0052] Compared with the traditional mechanical energy storage system, the step-by-step charging and discharging method of the mechanical energy storage system based on the asymmetric counterweight block of the present invention is more stable in both the energy storage charging and power generation stages, and the volatility of the power grid is greatly improved, which is beneficial to the safety of the power grid.

[0053] In a technical solution of the present invention, a computer-readable storage medium is also provided, storing a computer program, wherein the computer program enables a computer to execute the step-by-step charging and discharging method of a mechanical energy storage system based on an asymmetric counterweight.

[0054] In one technical solution of the present invention, an electronic device is also provided, comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the step-by-step charging and discharging method of the mechanical energy storage system based on the asymmetric counterweight block is implemented.

[0055] In the embodiments disclosed in the present application, the computer storage medium can be a tangible medium that can contain or store a program for use by or in conjunction with an instruction execution system, device or equipment. The computer storage medium can include, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, devices or equipment, or any suitable combination of the above. More specific examples of computer storage media can include electrical connections based on one or more lines, portable computer disks, hard disks, random access memories (RAM), read-only memories (ROM), erasable programmable read-only memories (EPROM or flash memory), optical fibers, portable compact disk read-only memories (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination of the above.

[0056] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed in this application can be implemented in electronic hardware or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0057] The above are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should be regarded as the protection scope of the present invention.

Claims

1. A step-by-step charging and discharging method for a mechanical energy storage system based on an asymmetric counterweight, characterized in that: The mass of the counterweight in the mechanical energy storage system is greater than the mass of the lift, forming an asymmetric counterweight; During the energy storage and charging process of the mechanical energy storage system, the elevator carrying the gravity block is lifted to the first designated floor of the mechanical energy storage system at a uniform speed, and the uniform descent process of the counterweight block is regarded as the first energy storage and charging stage; After the gravity block is lifted, the elevator descends at a constant speed from the first designated floor alone, and the process in which the counterweight block rises at a constant speed serves as the second energy storage charging stage; During the discharge process of the mechanical energy storage system, the elevator carrying the gravity block falls at a uniform speed to the second designated floor in the mechanical energy storage system, and the process of the counterweight block rising at a uniform speed is regarded as the first discharge stage; after the gravity block falls, the elevator alone rises at a uniform speed from the second designated floor, and the process of the counterweight block falling at a uniform speed is regarded as the second discharge stage.

2. According to claim 1, a step-by-step charging and discharging method for a mechanical energy storage system based on an asymmetric counterweight block is characterized in that: The mass of the counterweight block is the sum of the mass of the elevator and 1 / 2 of the mass of the gravity block.

3. A step-by-step charging and discharging method for a mechanical energy storage system based on an asymmetric counterweight according to claim 2, characterized in that: In the first energy storage charging stage, when the motor in the mechanical energy storage system drives the elevator carrying the gravity block to rise, the driving torque T generated on the traction shaft 1a for: Wherein, Mb represents the mass of the gravity block, r represents the radius of the traction shaft, and g represents the gravitational acceleration.

4. A step-by-step charging and discharging method for a mechanical energy storage system based on an asymmetric counterweight according to claim 2, characterized in that: In the second energy storage charging stage, the driving torque T generated on the traction shaft when the motor in the mechanical energy storage system drives the counterweight to rise 1b for: Wherein, Mb represents the mass of the gravity block, r represents the radius of the traction shaft, and g represents the gravitational acceleration.

5. A step-by-step charging and discharging method for a mechanical energy storage system based on an asymmetric counterweight according to claim 2, characterized in that: In the first discharge stage, the load torque T generated on the traction shaft when the motor in the mechanical energy storage system drives the elevator carrying the gravity block to descend 2a for: Wherein, Mb represents the mass of the gravity block, r represents the radius of the traction shaft, and g represents the gravitational acceleration.

6. A step-by-step charging and discharging method for a mechanical energy storage system based on an asymmetric counterweight according to claim 2, characterized in that: In the second discharge stage, the load torque T generated on the traction shaft when the motor in the mechanical energy storage system drives the counterweight to descend 2b for: Wherein, Mb represents the mass of the gravity block, r represents the radius of the traction shaft, and g represents the gravitational acceleration.

7. A step-by-step charging and discharging method for a mechanical energy storage system based on an asymmetric counterweight according to claim 1, characterized in that: The first designated floor refers to the floor range corresponding to when all the gravity blocks are lifted to the top of the mechanical energy storage system.

8. The step-by-step charging and discharging method of a mechanical energy storage system based on an asymmetric counterweight according to claim 1, characterized in that: The second designated floor refers to the floor range corresponding to when all the gravity blocks fall to the bottom of the mechanical energy storage system.

9. A computer-readable storage medium storing a computer program, characterized in that: The computer program enables the computer to execute the step-by-step charging and discharging method for a mechanical energy storage system based on an asymmetric counterweight as described in any one of claims 1-8.

10. An electronic device, characterized in that: include: A memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the step-by-step charging and discharging method for a mechanical energy storage system based on an asymmetric counterweight block as described in any one of claims 1 to 8 is implemented.

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