Gravity energy storage system and method for high-rise elevator energy recovery and storage

Abstract

The invention discloses a gravity energy storage system and method for high-rise elevator energy recovery and storage. The system comprises an energy recovery device, an energy storage device, an inversion and control system, a gravity energy storage execution system and a monitoring and dispatching system. The method comprises the following steps: S1, energy recovery: executing energy recovery operation to convert the kinetic energy of the elevator into regenerative electric energy and capture the regenerative electric energy when the elevator goes down in a heavy load or goes up in a light load; s2, energy storage: directly supplying or storing the captured regenerative electric energy; s3, releasing energy: converting gravitational potential energy into mechanical energy for power generation and power supply in the peak period of electricity price; and S4, emergency power supply: triggering energy release during power failure of the public power grid so as to perform emergency power supply. The system has the advantages of high efficiency, energy saving, low-cost energy storage and accurate matching with building energy demands.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of elevator technology, in particular to a gravity energy storage system and method for energy recovery and storage of high-rise elevators. BACKGROUND

[0002] With the acceleration of urbanization, the number of high-rise commercial buildings in China has increased rapidly. According to the data of the Ministry of Emergency Management, there are 11,000 super high-rise buildings above 100 meters in China; as of 2023, the number of buildings with a height of more than 150 meters reached 3088, and China accounted for 1472 of the world's high-rise buildings above 200 meters. Such buildings need to be equipped with a large number of elevators to meet the vertical transportation demand, for example, XX Land and Sea International Center with a height of more than 400 meters is equipped with 69 elevators, and XX Jinmao Mansion with a height of more than 400 meters is equipped with 61 elevators; the number of elevators in China has exceeded 10 million, and the daily average number of elevators in the core business district of first-tier cities can reach 5000 people.

[0003] Elevators are the core energy consumption equipment of high-rise commercial buildings, and their energy consumption accounts for 5%-15% of the total building energy consumption. During elevator operation, the motor needs to overcome the force of gravity and friction to do work and consume electricity when going up, and when going down, especially when heavy load is going down or light load is going up, the motor is in a power generation state, generating regenerative energy.

[0004] The traditional elevator system converts the regenerative energy into heat energy through a braking resistor, which not only causes energy loss but also increases the heat dissipation burden of the machine room;

[0005] Most existing energy recovery technologies use single energy storage devices such as lithium batteries, which have high total life cycle cost, short energy storage time, high carbon emissions, and insufficient safety, and are difficult to meet the multiple needs of existing high-rise buildings, including emergency power supply, peak load shifting, and demand response.

[0006] In addition, high-rise commercial buildings have special structures, limited core tube space, and high load-bearing requirements, and existing energy storage systems are difficult to adapt to their space and structural characteristics.

[0007] Therefore, there is an urgent need for a technical solution that can efficiently recover elevator regenerative energy, store energy at low cost and for a long time, adapt to building structures, and have multiple functions to solve the problems of high energy consumption, low energy utilization rate, and poor adaptability of energy storage systems for high-rise commercial building elevators. SUMMARY

[0008] The purpose of the present application is to provide a gravity energy storage system and method for energy recovery and storage of high-rise elevators. The present application has the advantages of high energy efficiency, low cost energy storage, and precise matching with building energy demand.

[0009] The technical solution of the present application:

[0010] A gravity energy storage system for high-rise elevator energy recovery and storage, comprising an energy recovery device, an energy storage device, an inverter and control system, a gravity energy storage execution system, and a monitoring and scheduling system;

[0011] The energy recovery device is electrically connected with the elevator traction motor, and is used for capturing regenerative electric energy generated by elevator operation; the energy recovery device comprises a regenerative braking module and a high-power-density capacitor module;

[0012] The energy storage device is electrically connected with the energy recovery device, and comprises a capacitor temporary storage unit and a gravity energy storage long-time unit, and is used for layered storage of regenerative electric energy;

[0013] The inverter and control system is electrically connected with the energy storage device, an internal power grid and a public power grid, respectively, and is used for converting direct current output by the energy storage device into alternating current with the same frequency, phase and amplitude as the power grid, and controlling the flow of electric energy among the internal power grid, the public power grid and the energy storage device;

[0014] The gravity energy storage execution system is electrically connected with the inverter and control system and matched with the gravity energy storage long-time unit, and is used for realizing conversion of electric energy and gravitational potential energy; the gravity energy storage execution system comprises a lifting car, a gravity block, a horizontal transportation RGV track trolley system and a generator assembly; the gravity block is arranged in a building stack area, and the building stack area comprises an upper storage stack area arranged at the top floor of the building and a lower storage stack area arranged at the bottom floor of the building;

[0015] The monitoring and scheduling system is communicatively connected with the energy recovery device, the energy storage device, the inverter and control system and the gravity energy storage execution system, respectively, and is used for monitoring the respective operating states, and can trigger emergency power supply, execute peak-valley arbitrage and demand response strategies according to settings.

[0016] In the foregoing gravity energy storage system for high-rise elevator energy recovery and storage, the regenerative braking module can switch the traction motor to a power generation state when the elevator is under heavy load and descending or light load and ascending at a reduced speed; and the capacitor module is used for capturing regenerative electric energy generated by the traction motor in the power generation state.

[0017] In the foregoing gravity energy storage system for high-rise elevator energy recovery and storage, the capacitor temporary storage unit is integrally arranged with the capacitor module, and is used for temporarily storing regenerative electric energy generated at the moment of elevator braking, for reuse when the elevator starts;

[0018] The gravity energy storage long-time unit is used for converting electric energy into gravitational potential energy to realize long-time storage.

[0019] In the foregoing gravity energy storage system for high-rise elevator energy recovery and storage, the lifting car is provided with multiple lifting cars arranged in the core tube of the building, and is used for carrying the gravity block;

[0020] The gravity block is configured with multiple gravity blocks;

[0021] The horizontal transportation RGV track trolley system is used for transferring the gravity blocks between the building stockyard area and the lifting car;

[0022] The upper warehouse stockyard area and the lower warehouse stockyard area are connected with the lifting car through the horizontal transportation RGV track trolley system, forming a closed loop for transferring the gravity blocks.

[0023] In the foregoing gravity energy storage system for high-rise elevator energy recovery, the peak-valley arbitrage strategy of the monitoring and scheduling system is specifically:

[0024] During the low electricity price period, the energy storage device takes electricity from the public power grid, and the gravity energy storage execution system lifts the gravity blocks from the lower warehouse stockyard area to the upper warehouse stockyard area for storing potential energy;

[0025] During the peak electricity price period, the gravity energy storage execution system generates electricity by releasing the gravity potential energy, and the electricity is preferentially supplied to the building internal load, and the remaining electricity is fed back to the public power grid.

[0026] In the foregoing gravity energy storage system for high-rise elevator energy recovery, the energy recovery device further comprises an energy distribution unit;

[0027] The energy distribution unit is used for dividing the captured regenerated electricity into two paths, one of which is directly supplied to the building internal real-time load through the inverter and control system, and the other of which is transmitted to the energy storage device for storage;

[0028] The distribution ratio of the energy distribution unit is dynamically adjusted by the monitoring and scheduling system according to the building real-time load and the remaining capacity of the energy storage device.

[0029] A gravity energy storage method for high-rise elevator energy recovery, comprising the following steps:

[0030] S1, energy recovery: performing energy recovery work to convert elevator kinetic energy into regenerated electricity and capturing it when the elevator is heavily loaded downward or lightly loaded upward;

[0031] S2, energy storage: directly supplying or storing the captured regenerated electricity as needed;

[0032] S3, energy release: transporting the gravity blocks downward during the peak electricity price period, converting the gravity potential energy into mechanical energy to drive the generator assembly to generate electricity for power supply;

[0033] S4, emergency power supply: triggering energy release when the public power grid is powered off to provide emergency power supply to the key load in the building.

[0034] In the foregoing gravity energy storage method for high-rise elevator energy recovery, the energy recovery of S1 has the following specific contents:

[0035] S1.1, when the elevator is in heavy load downlink working condition, the monitoring and scheduling system controls the regenerative braking module to start, so that the traction motor is switched to the power generation state, and the kinetic energy of the elevator descending is converted into regenerative electric energy;

[0036] S1.2, when the elevator is in light load uplink and needs to slow down near the target floor, the monitoring and scheduling system controls the regenerative braking module to start, so that the traction motor is switched to the power generation state, and the kinetic energy of the elevator slowing down is converted into regenerative electric energy;

[0037] S1.3, the capacitor module captures the regenerative electric energy generated in S1.1 and S1.2.

[0038] In the foregoing gravity energy storage system for high-rise elevator energy recovery and storage, the energy storage of S2 has the following specific contents:

[0039] S2.1, the energy distribution unit divides the captured regenerative electric energy into two paths, the first path is converted into alternating current through the inverter and control system, and then directly supplied to the real-time load inside the building; the second path is transmitted to the energy storage device;

[0040] S2.2, the capacitor temporary storage unit temporarily stores the high-power transient electric energy in the second path of regenerative electric energy, which is released for the next start of the elevator to reduce the power grid power consumption;

[0041] S2.3, when the capacitor temporary storage unit is full or the real-time load demand of the building is low, the monitoring and scheduling system controls the gravity energy storage execution system to start, and the horizontal transportation RGV track trolley system transfers the gravity blocks from the lower storage area to the lifting car, and the lifting car lifts the gravity blocks to the upper storage area, and converts the electric energy into gravitational potential energy for storage;

[0042] S2.4, during the low electricity price period, the monitoring and scheduling system controls the energy storage device to take power from the public power grid, and repeats the gravity potential energy storage process of S2.3 to supplement the stored energy.

[0043] In the foregoing gravity energy storage system for high-rise elevator energy recovery and storage, the energy release of S3 has the following specific contents:

[0044] S3.1, during the peak electricity price period, the monitoring and scheduling system controls the gravity energy storage execution system to start, and the lifting car carries the gravity blocks from the upper storage area to the lower storage area, and the gravitational potential energy of the gravity blocks is converted into mechanical energy to drive the generator assembly to generate electricity;

[0045] S3.2, the inverter and control system converts the direct current generated by the generator assembly into alternating current compatible with the power grid, and preferentially supplies the building internal load, and the remaining electric energy is fed back to the public power grid;

[0046] S3.3, when receiving the demand response instruction of the public power grid, repeating S3.1-S3.2, releasing the energy storage to reduce the power consumption of the building from the power grid, and obtaining the demand response compensation.

[0047] Compared with the prior art, the present application has the following beneficial effects:

[0048] The system of the present application can convert the energy that would be wasted into electric energy through the regenerative braking system and the energy recovery device during the heavy load downlink and light load uplink of the elevator operation, realize effective energy recovery, not only reduce the energy consumption of the elevator itself, but also provide a new way for building energy saving;

[0049] The present application can effectively reduce building energy consumption and provide peak shaving support for the power grid by using the recovered electric energy to store gravitational potential energy, which has significant economic and environmental benefits;

[0050] The monitoring and scheduling system can also trigger emergency power supply, and the stored gravitational potential energy can be converted into electric energy as an emergency backup power supply;

[0051] The energy conversion mechanism of the present application can store energy during the low electricity consumption period and release energy during the high electricity consumption period, effectively balancing the load of the power grid and improving the energy utilization efficiency.

[0052] In summary, the present application has the advantages of high energy efficiency, low cost energy storage, and precise matching with building energy demand. BRIEF DESCRIPTION OF DRAWINGS

[0053] Figure 1 is a schematic diagram of the framework of the system of the present application. DETAILED DESCRIPTION

[0054] The present application will be further described below in conjunction with the drawings and examples, but it is not intended to limit the present application.

[0055] Example. A gravity energy storage system for high-rise elevator energy recovery and storage, as shown in Figure 1 includes an energy recovery device, an energy storage device, an inverter and control system, a gravity energy storage execution system and a monitoring and scheduling system;

[0056] The energy recovery device is electrically connected with the elevator traction motor, and is used to capture the regenerative electric energy generated by the elevator operation; the energy recovery device includes a regenerative braking module and a high-power-density capacitor module;

[0057] The energy storage device is electrically connected with the energy recovery device, and includes a capacitor temporary storage unit and a gravity energy storage long-time unit, and is used to store regenerative electric energy in layers;

[0058] The inverter and control system is electrically connected with the energy storage device, the internal power grid and the public power grid respectively, and is used for converting the direct current output by the energy storage device into alternating current with the same frequency, phase and amplitude as the power grid, and controlling the flow of electric energy among the internal power grid, the public power grid and the energy storage device;

[0059] The gravity energy storage execution system is electrically connected with the inverter and control system and matched with the gravity energy storage long-time unit, and is used for realizing the conversion between electric energy and gravity potential energy; the gravity energy storage execution system comprises a lift car, a gravity block, a horizontal transportation RGV track trolley system and a generator assembly; the gravity block is arranged in a building stacking area, and the building stacking area comprises an upper storage stacking area arranged at the top floor of the building and a lower storage stacking area arranged at the bottom floor of the building;

[0060] The monitoring and dispatching system is communicatively connected with the energy recovery device, the energy storage device, the inverter and control system and the gravity energy storage execution system respectively, and is used for monitoring the respective operating states, triggering emergency power supply, executing peak-valley arbitrage and demand response strategies according to the settings.

[0061] The regenerative braking module can switch the traction motor to a power generation state when the elevator is under heavy load and descending or light load and ascending at a reduced speed; and the capacitor module is used for capturing the regenerative electric energy generated by the traction motor in the power generation state.

[0062] The capacitor temporary storage unit is integrally arranged with the capacitor module, and is used for temporarily storing the regenerative electric energy generated at the moment of elevator braking, for reuse when the elevator starts;

[0063] The gravity energy storage long-time unit is used for converting electric energy into gravity potential energy for long-time storage.

[0064] The lift cars are arranged in the core tube of the building, and are used for carrying the gravity blocks;

[0065] The gravity blocks are arranged in multiple blocks;

[0066] The horizontal transportation RGV track trolley system is used for transferring the gravity blocks between the building stacking area and the lift cars;

[0067] The upper storage stacking area and the lower storage stacking area are connected with the lift cars through the horizontal transportation RGV track trolley system, forming a closed loop for transferring the gravity blocks.

[0068] The peak-valley arbitrage strategy of the monitoring and dispatching system is specifically as follows:

[0069] During the low-price period, the energy storage device takes electric energy from the public power grid, and the gravity energy storage execution system lifts the gravity blocks from the lower storage stacking area to the upper storage stacking area for storing potential energy;

[0070] During peak electricity price periods, the gravity energy storage system releases gravitational potential energy to generate electricity, which is prioritized for supplying loads inside the building, with any surplus electricity fed back into the public grid.

[0071] The energy recovery device also includes an energy distribution unit;

[0072] The energy distribution unit is used to divide the captured regenerated electrical energy into two outputs: one output is directly supplied to the real-time loads inside the building (lighting, air conditioning, supermarket equipment) through an inverter and control system, and the other output is sent to an energy storage device for storage.

[0073] The allocation ratio of the energy distribution unit is dynamically adjusted by the monitoring and scheduling system based on the real-time building load and the remaining capacity of the energy storage device.

[0074] A gravity energy storage method for energy recovery and storage in high-rise elevators includes the following steps:

[0075] S1. Energy Recovery: When the elevator is heavily loaded and descending or lightly loaded and ascending, energy recovery is performed to convert the elevator's kinetic energy into regenerative electrical energy and capture it.

[0076] S2, Energy Storage: Directly supplying or storing captured renewable electrical energy as needed;

[0077] S3, Energy Release: During peak electricity price periods, the gravity block is lowered, and the gravitational potential energy is converted into mechanical energy to drive the generator assembly to generate electricity;

[0078] S4. Emergency Power Supply: When the public power grid fails, it triggers energy release to provide emergency power to critical loads in the building.

[0079] The energy recovery described in S1 is as follows:

[0080] S1.1 When the elevator is in a heavy-load downward working condition, the monitoring and dispatching system controls the regenerative braking module to start, so that the traction motor switches to the power generation state and converts the kinetic energy of the elevator's descent into regenerative electrical energy.

[0081] S1.2 When the elevator is lightly loaded and ascending and needs to decelerate as it approaches the target floor, the monitoring and dispatching system controls the regenerative braking module to start, so that the traction motor switches to the generator state and converts the kinetic energy of the elevator deceleration into regenerative electrical energy.

[0082] S1.3, the capacitor module captures the regenerative electrical energy generated by S1.1 and S1.2.

[0083] The energy storage described in S2 is as follows:

[0084] S2.1 The energy distribution unit divides the captured regenerated electrical energy into two paths. The first path is converted into AC power by the inverter and control system and directly supplied to the real-time load inside the building. The second path is sent to the energy storage device.

[0085] S2.2 The capacitor storage unit temporarily stores the high-power instantaneous electrical energy in the second regenerated power source, which is released when the elevator starts again to reduce the power consumption of the power grid.

[0086] S2.3 When the capacitor storage unit is full or the building's real-time load demand is low, the monitoring and scheduling system controls the gravity energy storage execution system to start. The horizontal transport RGV rail trolley system transfers the gravity block from the lower storage area to the lifting car. The lifting car lifts the gravity block to the upper storage area, converting electrical energy into gravitational potential energy for storage.

[0087] S2.4 During periods of low electricity prices, the monitoring and dispatching system controls the energy storage device to draw power from the public grid, repeating the gravitational potential energy storage process in S2.3 to replenish the stored energy.

[0088] The energy release described in S3 is as follows:

[0089] S3.1 During peak electricity price periods, the monitoring and dispatching system controls the gravity energy storage execution system to start. The lifting car carries the gravity block down from the upper storage area to the lower storage area. The gravity potential energy of the gravity block is converted into mechanical energy, which drives the generator assembly to operate and generate electricity.

[0090] S3.2 The inverter and control system converts the DC power generated by the generator assembly into AC power compatible with the power grid, giving priority to supplying the loads inside the building, and feeding the surplus power back to the public power grid;

[0091] S3.3 When receiving a demand response command from the public power grid, repeat S3.1-S3.2 to release energy storage to reduce the building's electricity consumption from the grid and obtain demand response compensation.

[0092] Principle verification

[0093] The implementation process of this invention is illustrated in detail using actual parameters of high-rise commercial buildings.

[0094] 1. Building and Equipment Foundation Parameters (Assumptions)

[0095] Building parameters: The external dimensions of the high-rise commercial building are 84m×84m×135m, with 30 floors above ground and a floor height of 4.5m, 3 floors underground and a floor height of 4.5m, and the core tube dimensions are 12m×12m;

[0096] Elevator parameters: 32 traction passenger elevators, rated load 1350kg, rated speed 3m / s; 16 gravity storage lifting cars, load 64t, running speed 2m / s;

[0097] Energy storage parameters: system capacity 5MW / 2.5MWh, energy storage efficiency 85%, energy storage duration 0.5 hours; gravity blocks 16t / block, 400 blocks in total, total weight 6400t;

[0098] Generator parameters: Siemens 1FC6404-6LA42 synchronous generator, 4MVA / 10kV, continuous output power 3.825MW, efficiency ≥97%.

[0099] 2. System Installation Process

[0100] 1) Structural adaptation and modification: The space for the installation of 16 gravity storage lifting cars is reserved in the core tube of the building. Horizontal transport RGV tracks are laid in the lower storage area of ​​the three underground floors and the upper storage area of ​​the top floor. The frame columns and core tube shear walls are made of C80 / C40 concrete to ensure that the load-bearing capacity meets the 6400t requirement.

[0101] 2) Installation of core components: ① The elevator traction motor integrates a regenerative braking module, and the capacitor module is installed in the elevator machine room; ② The inverter and control system and generator assembly are arranged in the generator room on the third basement floor; ③ The monitoring and dispatching system is installed in the monitoring room on the first floor, connecting the sensors and actuators of each component.

[0102] 3) Closed-loop commissioning: Build a closed loop for energy recovery, storage and release, test the communication and coordination capabilities of each component, and ensure that the regenerated energy capture rate, energy storage efficiency and emergency switching time are ≤1s.

[0103] 3. Operation and Maintenance Process

[0104] 1) Daily operation: The monitoring and dispatching system automatically executes the pre-stored strategy, collects parameters such as regenerated energy capture, energy storage capacity, and generator power in real time, and displays them through the human-machine interface;

[0105] During peak and off-peak periods, the gravity block is automatically raised and lowered and the electrical energy is released. The output power is adjusted after receiving the demand response command.

[0106] 2) Emergency Response: When the power grid fails, the system switches to emergency mode to supply power to critical loads, and at the same time sends an alarm signal through the monitoring system to notify the operation and maintenance personnel;

[0107] 3) Regular maintenance: Conduct regular inspections and maintenance as required.

[0108] By applying this system, operation and maintenance costs are reduced, with the annual maintenance cost of the mechanical system accounting for less than 5%, and the material lifespan reaching up to 50 years; the levelized cost of the entire life cycle is approximately 0.3-0.4 yuan / kWh, which is 40% lower than that of lithium battery energy storage.

[0109] With significant energy-saving effects, elevators in commercial buildings that are used frequently can reduce energy consumption by more than 35%. The annual electricity consumption of a single elevator has decreased from 36,792 kWh to 24,227 kWh, saving 12,565 kWh. Calculated at 1 yuan / kWh, this translates to an annual electricity cost saving of 12,565 yuan. The system's 32 elevators collectively save 402,080 kWh, resulting in an annual electricity cost saving of 402,080 yuan.

[0110] It has significant environmental benefits, with each elevator reducing CO2 emissions by approximately 1,500 kg per year, and the 32 elevators in this system reducing CO2 emissions by a total of 48,000 kg per year.

Claims

1. A gravity energy storage system for energy recovery and storage in high-rise elevators, characterized in that: This includes energy recovery devices, energy storage devices, inverter and control systems, gravity energy storage execution systems, and monitoring and dispatching systems; The energy recovery device is electrically connected to the elevator traction motor and is used to capture the regenerative electrical energy generated during elevator operation; the energy recovery device includes a regenerative braking module and a high power density capacitor module. The energy storage device is electrically connected to the energy recovery device and includes a capacitor temporary storage unit and a gravity energy storage long-term unit for stratified storage of regenerated electrical energy. The inverter and control system are electrically connected to the energy storage device, the internal power grid and the public power grid respectively. They are used to convert the DC power output by the energy storage device into AC power with the same frequency, phase and amplitude as the power grid, and to control the flow of electrical energy between the internal power grid, the public power grid and the energy storage device. The gravity energy storage execution system is electrically connected to the inverter and control system and matched with the gravity energy storage long-term unit to realize the conversion of electrical energy and gravitational potential energy; the gravity energy storage execution system includes a lifting car, gravity blocks, a horizontal transport RGV rail trolley system and a generator assembly; the gravity blocks are located in the building loading area, which includes an upper loading area located on the top floor of the building and a lower loading area located on the bottom floor of the building; The monitoring and scheduling system is connected to the energy recovery device, energy storage device, inverter and control system and gravity energy storage execution system respectively, and is used to monitor their respective operating status. It can trigger emergency power supply, execute peak-valley arbitrage and demand response strategies according to the settings.

2. The gravity energy storage system for energy recovery and storage in high-rise elevators according to claim 1, characterized in that: The regenerative braking module can switch the traction motor to generator mode when the elevator decelerates during heavy-load descent or light-load ascent; the capacitor module is used to capture the regenerative electrical energy generated by the traction motor in generator mode.

3. A gravity energy storage system for energy recovery and storage in high-rise elevators according to claim 1, characterized in that: The capacitor storage unit is integrated with the capacitor module and is used to temporarily store the regenerative electrical energy generated during elevator braking, so that it can be reused when the elevator starts. The gravity energy storage long-term unit is used to convert electrical energy into gravitational potential energy for long-term storage.

4. A gravity energy storage system for energy recovery and storage in high-rise elevators according to claim 1, characterized in that: The elevator car is provided in multiple units and is arranged in the core tube of the building to support the gravity block; The gravity block is configured in multiple parts; The horizontal transport RGV rail trolley system is used for the transfer of gravity blocks between the building loading area and the elevator car. The upper and lower storage areas are connected to the lifting car via a horizontal transport RGV rail trolley system, forming a closed loop for the transfer of gravity blocks.

5. A gravity energy storage system for energy recovery and storage in high-rise elevators according to claim 1, characterized in that, The peak-valley arbitrage strategy of the monitoring and scheduling system is as follows: During periods of low electricity prices, the energy storage device draws power from the public grid, and the gravity energy storage execution system lifts the gravity block from the lower storage area to the upper storage area to store potential energy. During peak electricity price periods, the gravity energy storage system releases gravitational potential energy to generate electricity, which is prioritized for supplying loads inside the building, with any surplus electricity fed back into the public grid.

6. A gravity energy storage system for energy recovery and storage in high-rise elevators according to claim 1, characterized in that: The energy recovery device also includes an energy distribution unit; The energy distribution unit is used to divide the captured regenerated electrical energy into two outputs: one output is directly supplied to the real-time load inside the building through an inverter and control system, and the other output is sent to an energy storage device for storage. The allocation ratio of the energy distribution unit is dynamically adjusted by the monitoring and scheduling system based on the real-time building load and the remaining capacity of the energy storage device.

7. A gravity energy storage method for a gravity energy storage system for high-rise elevator energy recovery and storage according to any one of claims 1-6, characterized in that, Includes the following steps: S1. Energy Recovery: When the elevator is heavily loaded and descending or lightly loaded and ascending, energy recovery is performed to convert the elevator's kinetic energy into regenerative electrical energy and capture it. S2, Energy Storage: Directly supplying or storing captured renewable electrical energy as needed; S3, Energy Release: During peak electricity price periods, the gravity block is lowered, and the gravitational potential energy is converted into mechanical energy to drive the generator assembly to generate electricity; S4. Emergency Power Supply: When the public power grid fails, it triggers energy release to provide emergency power to critical loads in the building.

8. A gravity energy storage method for energy recovery and storage in high-rise elevators according to claim 7, characterized in that, The energy recovery described in S1 is as follows: S1.1 When the elevator is in a heavy-load downward working condition, the monitoring and dispatching system controls the regenerative braking module to start, so that the traction motor switches to the power generation state and converts the kinetic energy of the elevator's descent into regenerative electrical energy. S1.2 When the elevator is lightly loaded and ascending and needs to decelerate as it approaches the target floor, the monitoring and dispatching system controls the regenerative braking module to start, so that the traction motor switches to the generator state and converts the kinetic energy of the elevator deceleration into regenerative electrical energy. S1.3, the capacitor module captures the regenerative electrical energy generated by S1.1 and S1.

2.

9. A gravity energy storage method for energy recovery and storage in high-rise elevators according to claim 7, characterized in that, The energy storage described in S2 is as follows: S2.1 The energy distribution unit divides the captured regenerated electrical energy into two paths. The first path is converted into AC power by the inverter and control system and directly supplied to the real-time load inside the building. The second path is sent to the energy storage device. S2.2 The capacitor storage unit temporarily stores the high-power instantaneous electrical energy in the second regenerated power source, which is released when the elevator starts again to reduce the power consumption of the power grid. S2.3 When the capacitor storage unit is full or the building's real-time load demand is low, the monitoring and scheduling system controls the gravity energy storage execution system to start. The horizontal transport RGV rail trolley system transfers the gravity block from the lower storage area to the lifting car. The lifting car lifts the gravity block to the upper storage area, converting electrical energy into gravitational potential energy for storage. S2.4 During periods of low electricity prices, the monitoring and dispatching system controls the energy storage device to draw power from the public grid, repeating the gravitational potential energy storage process in S2.3 to replenish the stored energy.

10. A gravity energy storage method for energy recovery and storage in high-rise elevators according to claim 7, characterized in that, The energy release described in S3 is as follows: S3.1 During peak electricity price periods, the monitoring and dispatching system controls the gravity energy storage execution system to start. The lifting car carries the gravity block down from the upper storage area to the lower storage area. The gravity potential energy of the gravity block is converted into mechanical energy, which drives the generator assembly to operate and generate electricity. S3.2 The inverter and control system converts the DC power generated by the generator assembly into AC power compatible with the power grid, giving priority to supplying the loads inside the building, and feeding the surplus power back to the public power grid; S3.3 When receiving a demand response command from the public power grid, repeat S3.1-S3.2 to release energy storage to reduce the building's electricity consumption from the grid and obtain demand response compensation.

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