Slope type gravity energy storage system power smoothing method and system

Abstract

The invention discloses a slope type gravity energy storage system power smoothing method and system. The method comprises the following steps: constructing a power smoothing structure for a slope type gravity energy storage system; according to the power smoothing structure, loss calculation of a single mass block in a transition area is carried out on the slope type gravity energy storage system in the energy release process; analyzing the relationship between the transmission ratio of the magnetic gear and the frequency of alternating current, driving the motor to accelerate through the magnetic gear, and converting kinetic energy into electric energy to compensate for power vacancy; the electric energy obtained through kinetic energy conversion is equal to energy lost when a single mass block passes through a transition zone of a system slope and a low-potential-energy platform, and power smoothing is achieved. The problem that due to the discrete characteristic of the mass block of the gravity energy storage system, the power output by the system is in stages is solved. A magnetic gear is combined with a flywheel rotor to make up for the torque vacancy of a motor shaft end, so that the problem of unsmooth power output of a slope type gravity energy storage system is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of gravity energy storage, and in particular to a power smoothing method and system for a slope type gravity energy storage system. Background Art

[0002] With the continuous development of renewable energy, the power grid has an increasing demand for various energy storage technologies. Gravity energy storage system, as a new type of physical energy storage that is both environmentally friendly and economical, has received more and more attention in recent years. Gravity energy storage technology is an energy storage technology that realizes the charging and discharging process of the system by raising and lowering the energy storage medium based on the height difference. It has a wide range of application prospects due to its large energy storage capacity, flexible site selection, little impact from the natural environment, and short construction period.

[0003] However, due to the discreteness of the mass block, gravity energy storage has the problem of power fluctuation. Power fluctuations during the charging and discharging process will cause fluctuations in the frequency and voltage of the power grid, ultimately affecting the power supply quality and stability of the system. Concentric magnetic gears are contactless in physical structure, have low loss and rapid response capabilities, and can respond quickly to fluctuations in a short period of time. When applied to gravity energy storage systems, they can improve the overall dynamic response capabilities of the system. Summary of the invention

[0004] In view of the above-mentioned problems, the present invention is proposed.

[0005] Therefore, the technical problem solved by the present invention is that power fluctuations may occur in the slope-type gravity energy storage system when the energy storage mass blocks are switched.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: a power smoothing method of a slope type gravity energy storage system, comprising:

[0007] Constructing a power smoothing structure for the slope gravity energy storage system;

[0008] According to the power smoothing structure, the loss of a single mass block in the transition area of ​​the slope type gravity energy storage system during the energy release process is calculated;

[0009] Analyze the relationship between the transmission ratio of the magnetic gear and the frequency of the AC power, use the magnetic gear to drive the motor to accelerate, convert kinetic energy into electrical energy, and make up for the power shortage;

[0010] The electrical energy obtained by kinetic energy conversion is made equal to the energy lost by a single mass block when it passes through the transition zone between the system slope and the low potential energy platform, thus achieving power smoothing.

[0011] As a preferred solution of the power smoothing method of the sloped gravity energy storage system described in the present invention, the sloped gravity energy storage system includes a high potential energy platform, a low potential energy platform, a motor, a speed change gear box, a clutch, a magnetic gear, a frequency converter, a battery, a flywheel rotor, a mass block position detection device, a mass block, and a slope track.

[0012] As a preferred solution of the power smoothing method of the slope type gravity energy storage system described in the present invention, the power smoothing structure includes: a mass block position sensor is installed in the area between the slope track and the low potential energy platform, and a power shortage signal is sent out by the mass block position;

[0013] When the signal is transmitted to the clutch installed between the motor and the magnetic gear, the clutch enters a fully linked state, and the flywheel rotor connected to the magnetic gear converts kinetic energy into electrical energy, filling the power gap and smoothing the power output of the system.

[0014] As a preferred solution of the power smoothing method of the slope type gravity energy storage system described in the present invention, the power shortage signal includes: the time of full linkage of the clutch is controlled by the power shortage signal, the mass block arrives at the installation position of the mass block position monitoring device, and according to the working principle of the slope type gravity energy storage system, the power shortage of a missing mass block can be obtained as follows:

[0015] ΔP=ηmgsinθ·v

[0016] Where η is the overall efficiency of the system, m is the mass of a single mass block, θ is the slope angle, v is the running speed of the mass block, and g is the gravitational acceleration;

[0017] The time when a single mass block just arrives at the transition region is recorded as t1, and the time when a single mass block leaves the transition region is recorded as t2. The energy ΔW lost by a single mass block in the transition region can be expressed as:

[0018] ΔW=ΔP·(t2-t1)=etamgsinθ·v·(t2-t1).

[0019] As a preferred solution of the power smoothing method of the ramp type gravity energy storage system described in the present invention, wherein: the magnetic gear comprises an inner rotor of the magnetic gear connected to the flywheel rotor, an outer rotor connected to the clutch, and coaxially connected to the motor;

[0020] The inner rotor of the magnetic gear is composed of a three-phase stator winding, which is externally connected to a frequency converter and a battery. The energized winding is used to replace the magnetic poles of the inner rotor magnetic ring. The ratio of the number of magnetic poles is a constant. By changing the frequency f of the alternating current, the speed of the outer rotor magnetic ring is adjusted to achieve control of the speed of the magnetic gear.

[0021] It is expressed as:

[0022]

[0023] Where G represents the ratio of the number of magnetic poles of the inner and outer rotor magnetic rings, Ω w Indicates the speed of the outer rotor magnetic ring, p w Indicates the number of magnetic pole pairs of the outer rotor magnetic ring, p n Indicates the number of magnetic pole pairs of the inner rotor magnetic ring;

[0024] When the magnetic gear ratio is G1, the speed of the magnetic ring of the rotor inside the magnetic gear corresponds to the maximum speed of the flywheel, and the frequency of the alternating current is recorded as f max , the speed of the outer rotor magnetic ring corresponds to the rated speed of the motor; when the magnetic gear ratio is G2, the speed of the inner rotor magnetic ring corresponds to the minimum speed of the flywheel, and the frequency of the alternating current is recorded as f min The speed of the outer rotor magnetic ring corresponds to the rated speed of the motor. The flywheel deceleration drives the motor to accelerate through the magnetic gear to make up for the power shortage.

[0025] As a preferred solution of the power smoothing method of the ramp-type gravity energy storage system described in the present invention, wherein: the flywheel rotor has three working conditions: charging, discharging and standby;

[0026] When the system motor starts to speed up, the flywheel rotor begins to rotate and enters the charging state to convert electrical energy into mechanical energy; when the flywheel speed reaches the set maximum speed, it enters the standby state and waits for the power shortage signal; when the mass block detection device detects that a mass block has arrived, it sends a power shortage signal, the clutch enters the full linkage state, and the mechanical energy stored in the flywheel is converted into electrical energy for external output;

[0027] The speed of the flywheel rotor transmitted to the motor side through the magnetic gear strain ratio is equal to the rated speed of the motor, maintaining the stability of the system.

[0028] As a preferred solution of the power smoothing method of the slope type gravity energy storage system described in the present invention, wherein: the method of making the electric energy obtained by kinetic energy conversion equal to the energy lost by a single mass block when crossing the transition zone between the system slope and the low potential energy platform includes: assuming that the rotational inertia of the original machine of the system is J N , the given flywheel moment of inertia is J F , then the moment of inertia of the entire transmission system is J N +J F , when the flywheel is at the highest frequency f max and the lowest frequency f min When the energy ΔE released between the two is equal to the energy ΔW lost by a single mass block when it passes through the transition zone between the system slope and the low potential energy platform, the power gap can be filled. Substituting the inertia relationship, we get:

[0029]

[0030] A power smoothing system of a slope type gravity energy storage system using any method described in the present invention, characterized in that:

[0031] A model building unit, which builds a power smoothing structure for the slope type gravity energy storage system;

[0032] An analysis unit, which calculates the loss of a single mass block in a transition region during the energy release process of the slope type gravity energy storage system according to the power smoothing structure;

[0033] The calculation unit analyzes the relationship between the transmission ratio of the magnetic gear and the frequency of the alternating current, drives the motor to accelerate through the magnetic gear, converts the kinetic energy into electrical energy, and makes up for the power shortage;

[0034] The control unit makes the electric energy obtained by kinetic energy conversion equal to the energy lost by a single mass block when crossing the transition zone between the system slope and the low potential energy platform, thereby achieving power smoothing.

[0035] A computer device comprises: a memory and a processor; the memory stores a computer program, wherein: the processor implements the steps of any one of the methods of the present invention when executing the computer program.

[0036] A computer-readable storage medium stores a computer program, wherein: when the computer program is executed by a processor, the steps of any one of the methods of the present invention are implemented.

[0037] Beneficial effects of the invention: The power smoothing method of the ramp-type gravity energy storage system provided by the invention overcomes the problem that the power output of the system is phased due to the discrete characteristics of the mass block of the gravity energy storage system. The magnetic gear is combined with the flywheel rotor to make up for the torque shortage at the motor shaft end to solve the problem of uneven power output of the ramp-type gravity energy storage system. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0039] Figure 1 An overall flow chart of a power smoothing method for a slope type gravity energy storage system provided by the first embodiment of the present invention;

[0040] Figure 2 A power smoothing structure diagram of a magnetic gear in a power smoothing method for a slope-type gravity energy storage system provided in the first embodiment of the present invention. DETAILED DESCRIPTION

[0041] In order to make the above-mentioned purposes, 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 drawings of the specification. Obviously, the described embodiments are part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary persons in the art without creative work should fall within the scope of protection of the present invention.

[0042] Example 1, reference Figure 1 , which is an embodiment of the present invention, provides a power smoothing method for a slope type gravity energy storage system, comprising:

[0043] S1: Construct a power smoothing structure for the slope gravity energy storage system.

[0044] The slope type gravity energy storage system comprises a high potential energy platform, a low potential energy platform, a motor, a speed change gear box, a clutch, a magnetic gear, a frequency converter, a battery, a flywheel rotor, a mass block position detection device, a mass block, and a slope track.

[0045] The power smoothing structure includes installing a mass position sensor in the area between the slope track and the low potential energy platform, and sending a power shortage signal based on the mass position; when the signal is transmitted to the clutch installed between the motor and the magnetic gear, the clutch enters a full linkage state, and the flywheel rotor connected to the magnetic gear converts kinetic energy into electrical energy to fill the power shortage and smooth the power output of the system.

[0046] The power fluctuation of the slope gravity energy storage system in the energy storage stage is the fluctuation of the load and does not need to be smoothed. Therefore, this embodiment only targets the fluctuation of the slope gravity energy storage system in the energy release stage.

[0047] S2: According to the power smoothing structure, the loss of a single mass block in the transition area of ​​the slope type gravity energy storage system during the energy release process is calculated.

[0048] The power shortage signal controls the time of full clutch linkage, and the mass block reaches the installation location of the mass block position monitoring device. According to the working principle of the ramp-type gravity energy storage system, the power shortage of a missing mass block can be obtained as:

[0049] ΔP=ηmgsinθ·v

[0050] Where η is the overall efficiency of the system, m is the mass of a single mass block, θ is the slope angle, v is the running speed of the mass block, and g is the gravitational acceleration.

[0051] Specifically, during the energy release process of the ramp gravity energy storage system, assuming that there are n mass blocks on the ramp track and no mass block reaches the transition part between the ramp track and the low potential energy position, the mechanical power P provided by the mass block to the motor is m It can be expressed as:

[0052] P m =nmgsinθ·v (1)

[0053] When a mass block reaches the transition part between the ramp track and the low potential energy position, that is, when the number of mass blocks on the ramp track becomes n-1 (the same below), the mechanical power P provided by the mass block to the motor is m(n-1) It can be expressed as:

[0054] P m(n-1) =(n-1)mgsinθ·v(2)

[0055] Where m is the weight of a single mass block, θ is the angle between the ramp track and the horizontal ground, and v is the speed of the mass block on the ramp.

[0056] Assuming that the power generation efficiency of the system is η after considering various losses of the slope gravity energy storage system, the power generated by the motor is P g It can be expressed as:

[0057] P g =ηP m (3)

[0058] When a mass block reaches the transition section between the ramp track and the low potential energy position, the power P generated by the motor is g(n-1) It can be expressed as:

[0059] P g(n-1) =ηP m(n-1) (4)

[0060] At this time, the power change ΔP of the motor output can be expressed as:

[0061] ΔP=ηmgsinθ·v (5)

[0062] The time when a single mass block just arrives at the transition region is recorded as t1, and the time when a single mass block leaves the transition region is recorded as t2. The energy ΔW lost by a single mass block in the transition region can be expressed as:

[0063] ΔW=ΔP·(t2-t1)=etamgsinθ·v·(t2-t1)(6)

[0064] S3: Analyze the relationship between the transmission ratio of the magnetic gear and the frequency of the AC power, drive the motor to accelerate through the magnetic gear, convert the kinetic energy into electrical energy, and make up for the power shortage.

[0065] For the concentric magnetic gear, the following topological connection form is adopted: the inner rotor magnetic ring is connected to the flywheel, and the outer rotor magnetic ring is coaxially connected to the motor through a clutch.

[0066] The premise for the concentric magnetic gear to work normally is that the number of magnetic pole pairs of the inner rotor magnetic ring is p n , the number of magnetic pole pairs of the outer rotor magnetic ring (the number of pole pairs of the rotating magnetic field) is p w , the number of magnetic adjustment blocks contained in the magnetic adjustment ring is N, then the relationship that these three should satisfy is:

[0067] N=p n +p w (7)

[0068] Inner rotor magnetic ring speed Ω n , outer rotor magnetic ring speed Ω w And the speed of the magnetic ring Ω t The relationship between the three should satisfy:

[0069]

[0070] During operation, assuming Ω n It is always positive, and its rotation direction is used as the reference direction of all speeds and torques during the working process, that is, the speed, torque and Ω n When the directions are the same, they are positive, otherwise they are negative; and it is stipulated that all the power that drives the rotor or rotating magnetic field during the working process is positive, and the power that brakes is negative. In order to facilitate the control of the magnetic gear during the working process, the magnetic adjustment ring is kept stationary during power smoothing, then formula (8) becomes:

[0071]

[0072] Formula (9) can be further transformed into:

[0073]

[0074] The ratio of the number of magnetic pole pairs of the inner and outer rotor magnetic rings is defined as the transmission ratio of the magnetic gear, denoted by G.

[0075] In order to facilitate the effective control of the magnetic gear during the power smoothing process, the inner rotor magnetic ring is replaced by a three-phase symmetrical winding connected to the flywheel. The flywheel speed is the same as the speed of the inner rotor magnetic ring. That is, the magnetic poles of the inner rotor magnetic ring are equivalently replaced by the energized winding. The ratio of the number of magnetic poles is a constant. By changing the AC frequency f, the speed of the outer rotor magnetic ring is adjusted to achieve the control of the speed of the magnetic gear. Therefore, formula (10) can be further transformed into:

[0076]

[0077] When the magnetic gear ratio is G1, the speed of the magnetic ring of the rotor inside the magnetic gear corresponds to the maximum speed of the flywheel. At this time, the frequency of the AC power is recorded as f max , the speed of the outer rotor magnetic ring corresponds to the rated speed of the motor; when the magnetic gear ratio is G2, the speed of the inner rotor magnetic ring corresponds to the minimum speed of the flywheel, and the frequency of the alternating current is recorded as f min , the speed of the outer rotor magnetic ring still corresponds to the rated speed of the motor. At this time, the flywheel decelerates and drives the motor to accelerate through the magnetic gear to make up for the power shortage.

[0078] S4: Make the electrical energy obtained from kinetic energy conversion equal to the energy lost by a single mass block when crossing the transition zone between the system slope and the low potential energy platform, so as to achieve power smoothing.

[0079] Assume the original mechanical moment of inertia of the system is J N , the given flywheel moment of inertia is J F , then the moment of inertia of the entire transmission system is J N +J F , when the flywheel is at the highest frequency f max and the lowest frequency f min The energy ΔE released between the two is equal to the energy ΔW lost by a single mass block when it passes through the transition zone between the system slope and the low potential energy platform, then:

[0080]

[0081] In the formula, Ω max With Ω min The maximum frequency of alternating current is f max With the lowest frequency f min The corresponding flywheel speed can be further simplified by substituting it into the speed and frequency formula:

[0082]

[0083] Right now:

[0084]

[0085] On the other hand, this embodiment also provides a slope type gravity energy storage system power smoothing system, which includes:

[0086] The model building unit constructs a power smoothing structure for the slope type gravity energy storage system.

[0087] The analysis unit calculates the loss of a single mass block in the transition region during the energy release process of the slope type gravity energy storage system according to the power smoothing structure.

[0088] The calculation unit analyzes the relationship between the transmission ratio of the magnetic gear and the frequency of the alternating current, drives the motor to accelerate through the magnetic gear, converts the kinetic energy into electrical energy, and makes up for the power shortage.

[0089] The control unit makes the electric energy obtained by the dynamic conversion equal to the energy lost by a single mass block when it passes through the transition zone between the system slope and the low potential energy platform, thereby achieving power smoothing.

[0090] If the above functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several instructions for enabling a computer device (which can be a personal computer, server, or network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, etc., which can store program codes.

[0091] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as an ordered list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute instructions), or in conjunction with such instruction execution systems, devices or apparatuses. For the purposes of this specification, "computer-readable medium" can be any device that can contain, store, communicate, propagate or transmit a program for use by an instruction execution system, device or apparatus, or in conjunction with such instruction execution systems, devices or apparatuses.

[0092] More specific examples of computer-readable media (a non-exhaustive list) include the following: an electrical connection with one or more wires (electronic device), a portable computer disk case (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be a paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, deciphering or, if necessary, processing in another suitable manner, and then stored in a computer memory.

[0093] It should be understood that the various parts of the present invention can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, a plurality of steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0094] Example 2 is an embodiment of the present invention, which provides a power smoothing method for a slope-type gravity energy storage system. In order to verify the beneficial effects of the present invention, scientific demonstration is carried out through economic benefit calculation and simulation experiments.

[0095] Assume that the slope track has an inclination angle of 30°, the mass of a single energy storage mass block is 3 tons, the running speed along the slope track is 1m / s, and that there is a mass block sliding down the slope steadily. The efficiency η of the system is 80%. The asynchronous motor does not require an external synchronization device when starting. The starting process is smooth and has little impact, which is suitable for applications with frequent starts and stops. The number of pole pairs of the asynchronous motor is 2, and the rated speed is 1500r / min. After the energy storage mass block reaches the low potential energy platform, there is no mass block on the slope. The equivalent moment of inertia of the original machine is the moment of inertia of the asynchronous motor, that is, J N =0.1234Nm.

[0096] Calculate the mechanical power P of the mass block m and generator output power P e for:

[0097] P m =n×mgsinθ×V1=14.7(kW)

[0098] P e =η×P m =11.7(kW)

[0099] The weight position monitoring device detects that the energy storage mass block has reached the transition zone and is separated from the transmission device. The output power shortfall ΔP of the gravity energy storage system is:

[0100] ΔP1=P e =11.7(kW)

[0101] Assuming that the time for the heavy object position monitoring device to detect the switching of the energy storage mass block in the transition zone is 2s, the energy lost by the ramp-type gravity energy storage system when the energy storage mass block switches is:

[0102] ΔW=ΔP·Δt=etamgsinθ·V·(t2-t1)=11.7×2=23.4(kJ)

[0103] Adjust the frequency converter so that the maximum and minimum frequencies of the AC power controlling the magnetic gear are:

[0104] f max =51.5Hz

[0105] f min =46.416Hz

[0106] Finally, the flywheel moment of inertia required to smooth power fluctuations in this ramp-type gravity energy storage system is determined as:

[0107]

[0108] 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 power smoothing method for a slope gravity energy storage system, characterized in that: include: Constructing a power smoothing structure for the slope gravity energy storage system; According to the power smoothing structure, the loss of a single mass block in the transition area of ​​the slope type gravity energy storage system during the energy release process is calculated; Analyze the relationship between the transmission ratio of the magnetic gear and the frequency of the AC power, use the magnetic gear to drive the motor to accelerate, convert kinetic energy into electrical energy, and make up for the power shortage; The electrical energy obtained by kinetic energy conversion is made equal to the energy lost by a single mass block when it passes through the transition zone between the system slope and the low potential energy platform, thus achieving power smoothing.

2. The power smoothing method of the slope type gravity energy storage system according to claim 1, characterized in that: The slope type gravity energy storage system comprises a high potential energy platform, a low potential energy platform, a motor, a speed change gear box, a clutch, a magnetic gear, a frequency converter, a battery, a flywheel rotor, a mass block position detection device, a mass block, and a slope track.

3. The power smoothing method of the slope type gravity energy storage system according to claim 2, characterized in that: The power smoothing structure includes: installing a mass block position sensor in the area between the ramp track and the low potential energy platform, and sending a power shortage signal based on the mass block position; When the signal is transmitted to the clutch installed between the motor and the magnetic gear, the clutch enters a fully linked state, and the flywheel rotor connected to the magnetic gear converts kinetic energy into electrical energy, filling the power gap and smoothing the power output of the system.

4. The power smoothing method of the slope type gravity energy storage system according to claim 3, characterized in that: The power shortage signal includes the time when the clutch is fully linked and the mass block reaches the installation location of the mass block position monitoring device. According to the working principle of the ramp-type gravity energy storage system, the power shortage of a missing mass block can be obtained as follows: ΔP=ηmgsinθ·v Where η is the overall efficiency of the system, m is the mass of a single mass block, θ is the slope angle, v is the running speed of the mass block, and g is the gravitational acceleration; The time when a single mass block just arrives at the transition region is recorded as t1, and the time when a single mass block leaves the transition region is recorded as t2. The energy ΔW lost by a single mass block in the transition region can be expressed as: ΔW=ΔP·(t2-t1)=etamgsinθ·v·(t2-t1).

5. The power smoothing method of the slope type gravity energy storage system according to claim 4, characterized in that: The magnetic gear comprises an inner rotor connected to a flywheel rotor, an outer rotor connected to a clutch, and coaxially connected to a motor; The inner rotor of the magnetic gear is composed of a three-phase stator winding, which is externally connected to a frequency converter and a battery. The energized winding is used to replace the magnetic poles of the inner rotor magnetic ring. The ratio of the number of magnetic poles is a constant. By changing the frequency f of the alternating current, the speed of the outer rotor magnetic ring is adjusted to achieve control of the speed of the magnetic gear. It is expressed as: Where G represents the ratio of the number of magnetic poles of the inner and outer rotor magnetic rings, Ω w Indicates the speed of the outer rotor magnetic ring, p w Indicates the number of magnetic pole pairs of the outer rotor magnetic ring, p n Indicates the number of magnetic pole pairs of the inner rotor magnetic ring; When the magnetic gear ratio is G1, the speed of the magnetic ring of the rotor inside the magnetic gear corresponds to the maximum speed of the flywheel, and the frequency of the alternating current is recorded as f max , the speed of the outer rotor magnetic ring corresponds to the rated speed of the motor; when the magnetic gear ratio is G2, the speed of the inner rotor magnetic ring corresponds to the minimum speed of the flywheel, and the frequency of the alternating current is recorded as f min The speed of the outer rotor magnetic ring corresponds to the rated speed of the motor. The flywheel deceleration drives the motor to accelerate through the magnetic gear to make up for the power shortage.

6. The power smoothing method of the slope type gravity energy storage system according to claim 5, characterized in that: The flywheel rotor has three working conditions: charging, discharging and standby; When the system motor starts to speed up, the flywheel rotor begins to rotate and enters the charging state to convert electrical energy into mechanical energy; when the flywheel speed reaches the set maximum speed, it enters the standby state and waits for the power shortage signal; when the mass block detection device detects that a mass block has arrived, it sends a power shortage signal, the clutch enters the full linkage state, and the mechanical energy stored in the flywheel is converted into electrical energy for external output; The speed of the flywheel rotor transmitted to the motor side through the magnetic gear strain ratio is equal to the rated speed of the motor, maintaining the stability of the system.

7. The power smoothing method of the slope type gravity energy storage system according to claim 6, characterized in that: The method of converting kinetic energy into electrical energy equal to the energy lost by a single mass block when it passes through the transition zone between the system slope and the low potential energy platform includes: assuming that the rotational inertia of the original machine of the system is J N , the given flywheel moment of inertia is J F , then the moment of inertia of the entire transmission system is J N +J F , when the flywheel is at the highest frequency f max and the lowest frequency f min When the energy ΔE released between the two is equal to the energy ΔW lost by a single mass block when it passes through the transition zone between the system slope and the low potential energy platform, the power gap can be filled. Substituting the inertia relationship, we get:

8. A power smoothing system of a slope type gravity energy storage system using the method according to any one of claims 1 to 7, characterized in that: A model building unit, which builds a power smoothing structure for the slope type gravity energy storage system; An analysis unit, which calculates the loss of a single mass block in a transition region during the energy release process of the slope type gravity energy storage system according to the power smoothing structure; The calculation unit analyzes the relationship between the transmission ratio of the magnetic gear and the frequency of the alternating current, drives the motor to accelerate through the magnetic gear, converts the kinetic energy into electrical energy, and makes up for the power shortage; The control unit makes the electric energy obtained by kinetic energy conversion equal to the energy lost by a single mass block when crossing the transition zone between the system slope and the low potential energy platform, thereby achieving power smoothing.

9. A computer device comprising: A memory and a processor; the memory stores a computer program, wherein the processor implements the steps of any method as claimed in claim 1 when executing the computer program.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 7 are implemented.

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