CN-121584899-B - Gravity energy storage system

CN121584899BCN 121584899 BCN121584899 BCN 121584899BCN-121584899-B

Abstract

The invention discloses a gravity energy storage system, which belongs to the technical field of electric energy storage systems and comprises a mountain body, an annular track, a bearing vehicle, a mass block synchronizing device, a mass block, an upper stack area and a lower stack area, wherein the annular track is arranged on the side face of the mountain body, the lower stack area and the mass block synchronizing device are arranged in the bottom area of the mountain body, the upper stack area and the mass block synchronizing device are arranged on the top of the mountain body, the bearing vehicle moves along the annular track, and the mass block synchronizing device loads the mass block in the bearing vehicle or unloads the mass block from the bearing vehicle. According to the invention, loading and unloading of the mass blocks can be completed without stopping, a plurality of bearing vehicles move on the annular track, and the loading and unloading of the bearing vehicles of the mass blocks on the left side and the right side are controlled to control the charging and discharging working conditions of the whole gravity energy storage system, so that the rapid charging and discharging working condition switching function of the system is realized.

Inventors

WANG ZUFAN
ZHAO HAISEN
LI YANSHUO
Wu Gaoyun
YU XUN
WANG XIAN
LI JUNLONG
JIAO SHENGLIN
XU GUORUI
HUANG YONGZHANG

Assignees

华北电力大学

Dates

Publication Date: 20260508
Application Date: 20260127

Claims (3)

1. The gravity energy storage system is characterized by comprising a mountain base body, an annular track, a carrier vehicle, a mass block synchronizing device, a mass block, an upper stacking area and a lower stacking area, wherein the annular track is arranged on the side surface of the mountain base body; The mass block synchronizing device comprises a synchronizing connection device, an electromagnetic push-pull device, a ball conveying chain and a synchronizing track, wherein the synchronizing connection device and the electromagnetic push-pull device are arranged on the same connecting plate and jointly move along the synchronizing track; The synchronous connection device comprises a synchronous rod, a pantograph is arranged on the side wall of the headstock of the carrier, and the synchronous rod is in contact with the pantograph, so that the carrier, the synchronous connection device and a carried mass block can move at the same speed; the electromagnetic push-pull device comprises a push-pull rod, a mass block is electromagnetically adsorbed at the end part of the push-pull rod, and the mass block is loaded in the carrier or unloaded from the carrier by the push-pull rod; The bearing vehicle comprises rollers, an electrohydraulic device, an in-vehicle sensor c and a protection rod, wherein the bearing vehicle is in a shape like a Chinese character 'Hui', and a plurality of rollers are arranged on the inner wall of the bearing vehicle; The top of the interior of the carrier is provided with an electrohydraulic device, a hydraulic sensor is arranged in the electrohydraulic device, the electrohydraulic device is started after the hydraulic sensor judges that the mass block completely enters the carrier, and the electrohydraulic device is started to stabilize the mass block after the mass block completely enters the carrier; The annular rail is provided with a rail sensor a and a rail sensor b, wherein the rail sensor a is positioned at the upper part of the right side edge of the annular rail, and the rail sensor b is positioned at the lower part of the left side edge of the annular rail; The charging method comprises the following steps: The running direction of the carrier on the annular track is anticlockwise, when the carrier starts from the lower stack area and the carrier with the loaded mass block runs to the position of the track sensor a along the positive direction of the X axis of the track before starting, the synchronous connection device of the upper stack area receives a signal to prepare synchronous connection, the synchronous motor pre-accelerates the electromagnetic push-pull device of the upper stack area along the reverse direction of the X axis, after the synchronous rod contacts with the pantograph at the front end of the carrier, the carrier is electrified, the motor above the carrier drives the protection rod to open to two sides, meanwhile, the electro-hydraulic device is closed, the electromagnetic push-pull device forwards to the mass block along the Y axis, the electromagnetic device starts to absorb the mass block to move along the reverse direction of the Y axis to finish unloading of the mass block, and after the mass block completely leaves the car body, the sensor c in the carrier sends a signal to enable the motor above the carrier to start to withdraw the protection rod, the synchronous connection device moves to the track corner, and the synchronous rod is disconnected from the carrier; The method comprises the steps that a carrier continuously moves to a track sensor b along a track, a synchronous device in a lower stack area receives signals, a synchronous motor pre-accelerates an electromagnetic push-pull device carrying a mass block along the positive direction of an X axis, after a synchronous rod is in contact with a pantograph at the front end of the carrier, the carrier is electrified, a motor above the carrier starts to drive a protection rod to open to two sides, the mass block sucked in advance is pushed into the carrier along the reverse direction of the Y axis by the electromagnetic push-pull device in the lower stack area, after the mass block completely enters a car body, a sensor c in the carrier sends out signals, an electro-hydraulic device starts, and simultaneously, the motor above the carrier starts to retract the protection rod, after the electro-hydraulic device completely presses the mass block, the hydraulic sensor starts the electro-hydraulic device to stop, the synchronous connection device moves to the corner of the track along the synchronous track, the synchronous rod is disconnected from the carrier, and after the carrier is powered off, the carrier moves along the positive direction of the X axis to continue the next cycle.
2. The gravity energy storage system according to claim 1, comprising a discharging method, comprising the steps of: When the carrier starts from an upper stacking area and the carrier with the loaded mass blocks moves to a position of a track sensor b along the X axis reverse direction of the track before starting, a synchronous connection device of a lower stacking area receives signals to prepare synchronous connection, a synchronous motor pre-accelerates an electromagnetic push-pull device of the lower stacking area along the X axis forward direction, after a synchronous rod is contacted with a pantograph at the front end of the carrier, the carrier is electrified, a motor above the carrier drives a protection rod to open to two sides, meanwhile, an electro-hydraulic device is closed, the electromagnetic push-pull device moves to the mass blocks along the Y axis reverse direction, the electromagnetic push-pull device starts to absorb the mass blocks to move along the Y axis forward direction to finish unloading of the mass blocks, and after the mass blocks completely leave the car body, a sensor c in the carrier sends out signals to enable the motor above the carrier to start to withdraw the protection rod, the synchronous connection device moves to the corner of the track along the synchronous track, and the synchronous rod is disconnected with the carrier, and the carrier is powered off; The method comprises the steps that a carrier continuously forwards to a track sensor a along the X axis of the track, a synchronous connection device in a lower stack area receives signals, a synchronous motor pre-accelerates an electromagnetic push-pull device carrying a mass block along the reverse direction of the X axis, after a synchronous rod is contacted with a pantograph at the front end of the carrier, the carrier is electrified, a motor above the carrier is started to drive a protection rod to open towards two sides, the electromagnetic push-pull device in the upper stack area pushes the pre-sucked mass block into the carrier along the positive direction of the Y axis, after the mass block completely enters a car body, a sensor c in the carrier sends signals, an electrohydraulic device is started, and meanwhile, the motor above the carrier starts to withdraw the protection rod, after the electrohydraulic device completely presses the substantial mass block, the hydraulic sensor starts to stop, the synchronous connection device moves to the corner of the track, the synchronous rod is disconnected with the carrier, and after the carrier is powered off, the carrier moves along the reverse direction of the X axis to continue the next cycle; When the charging is switched to discharging, after the system receives a working condition conversion signal, the synchronous connection device of the upper stack area and the lower stack area has a conversion function, the track sensor a can enable the synchronous connection device to accelerate in advance only when the sensor c in the vehicle is not started, namely, the synchronous connection device can be started to accelerate in advance only when an empty vehicle passes through, loading or unloading of the mass blocks is completed, and then the mass blocks in the charging working condition do not enter the upper stack area after reaching the top of a mountain matrix, continue to operate and turn into downlink power generation.
3. A gravity energy storage system according to claim 2 wherein each of said vehicles is spaced apart by a distance L.

Description

Gravity energy storage system Technical Field The invention relates to the technical field of electric energy storage systems, in particular to a gravity energy storage system. Background Gravity energy storage is a large-scale physical energy storage technology based on the gravitational potential energy principle, and the core mechanism is that an electric driving system lifts a heavy object (such as a concrete block, a metal block or water and the like) to store electric energy, and a generator is driven to generate electricity through falling of the heavy object when the electric energy storage is needed. Along with the acceleration of global energy structures to renewable energy transformation with intermittent characteristics such as wind power, photovoltaic and the like, the demand for large-scale energy storage technology with long-term energy storage capacity and low electric cost is increasingly urgent. Under the background, the traditional pumped storage is limited by geographical conditions and is difficult to popularize on a large scale, and the lithium battery energy storage is faced with the problems of high cost, limited resources and the like, so that the factors jointly push the gravity energy storage technology to become an important research direction in the current energy storage field. Modern gravity Energy storage technology has entered a rapid development stage since 2010, and has emerged various innovative technical routes such as solid weight stacking (e.g., energy vat tower crane system), slope rail train (e.g., ARES electric train system), abandoned mine shaft (e.g., GRAVITRICITY deep well system), and the like. The technical proposal has the remarkable advantages that the service life of the system can reach 30-50 years and far exceeds that of a chemical battery, the electricity-to-electricity cost can be controlled at a lower level of 0.05-0.15 dollar/kilowatt-hour, and meanwhile, the physical energy storage mode is adopted to completely avoid chemical pollution and has outstanding environmental protection property. In addition, the scale of the gravity energy storage system is flexible and adjustable, and the gravity energy storage system can be used for distributed small-sized energy storage and can be expanded to large-scale application of a power grid level. The gravity energy storage system realizes non-stop switching and faces various technical challenges that firstly, response delay is generated when the movement direction of a heavy object is switched due to inertia of a mechanical system, a motor needs to be quickly switched from an electric mode to a power generation mode, a transmission mechanism also needs to bear impact caused by direction mutation, and secondly, power fluctuation easily occurs in the switching process to influence the frequency stability of a power grid, which is particularly critical to a system participating in frequency modulation service. Furthermore, the switching process is accompanied by significant energy conversion efficiency losses, including kinetic energy losses and additional energy consumption during the transition phase, which may reduce the overall efficiency of the system by 5% -10%. The design of safety protection mechanisms also faces challenges, and a balance needs to be struck between overload protection and fast switching, emergency braking and smooth transitions. Disclosure of Invention The invention aims to provide a gravity energy storage system, which can finish loading and unloading of mass blocks without stopping, and a plurality of bearing vehicles move on an annular track, and the loading and unloading of the bearing vehicles of the mass blocks on the left side and the right side are controlled to control the charging and discharging working conditions of the whole gravity energy storage system so as to realize the rapid charging and discharging working condition switching function of the system. The invention provides a gravity energy storage system, which comprises a mountain base body, an annular track, a bearing vehicle, a mass block synchronizing device, a mass block, an upper stacking area and a lower stacking area, wherein the annular track is arranged on the side face of the mountain base body, the lower stacking area and the mass block synchronizing device are arranged in the bottom area of the mountain base body, the upper stacking area and the mass block synchronizing device are arranged on the top of the mountain base body, the bearing vehicle moves along the annular track, and the mass block synchronizing device loads the mass block in the bearing vehicle or unloads the mass block from the bearing vehicle. Preferably, the mass block synchronizing device comprises a synchronous connection device, an electromagnetic push-pull device, a ball conveying chain and a synchronous track, wherein the synchronous connection device and the electromagnetic push-pull device are arranged on the same connecting plate and