Rail type gravity energy storage power station

Abstract

The utility model discloses a rail type gravity energy storage power station, the power station is arranged on a rail, two sides of the bottom of a train are provided with driving plates, the power station comprises a supporting seat, a friction wheel, a transmission piece, a permanent magnet synchronous motor, a PLC control cabinet and a storage battery energy storage control cabinet, when the train passes through the power station, the friction wheel is in friction connection with the train driving plates, and the transmission piece is connected with the storage battery energy storage control cabinet. The permanent magnet synchronous motor is electrically connected with the storage battery energy storage control cabinet through a first on-off switch, the permanent magnet synchronous motor is connected with a power grid power source through a second on-off switch, a plurality of position sensors are arranged on the slope section of the track, and the total controller feeds back the position sensors to the storage battery energy storage control cabinet when the train is in downhill transportation according to the position sensors. Otherwise, the permanent magnet synchronous motor is controlled to operate as a motor. When the power station is applied to a slope section track, a driving mode and a power generation mode can be automatically switched according to ascending or descending of a train, so that one-station compatibility of power generation and driving is realized.

Description

Technical Field

[0001] The utility model belongs to the field of gravity energy storage power, in particular to a track-type gravity energy storage power station. Background Art

[0002] With the rapid development of my country's national economy, the types and number of electrical equipment have increased dramatically, causing the peak-valley difference of the power grid to continue to increase, which not only aggravates the difficulty of peak regulation of the power grid, but also brings huge challenges to the stability of the power grid. The energy storage system can store energy when the power grid has excess energy and release energy when the power grid needs it. The millisecond-level power dynamic compensation capability of the advanced energy storage system can greatly improve the instability problems caused by the randomness, volatility and intermittency of renewable energy power generation to the power grid. In the power market environment, peak-valley electricity prices are implemented. The energy storage system can store the excess electricity generated after the power source participates in the grid dispatch at a low electricity price, and merge it into the grid when there is a dispatch demand or high electricity price, participate in peak regulation, and maximize the benefits of distributed power generation.

[0003] In a rail-type gravity energy storage system, a driving station is used to drive a train to travel on a track. The driving station is set at the track. The train is an unpowered loading vehicle. When the train passes a downhill section, its gravitational potential energy is converted into kinetic energy, and the kinetic energy is converted into electrical energy for storage through a power station. In a rail-type energy storage system, due to the influence of the energy storage scale, the size of the site, or the need to build a verification test line, when on a slope track, the up and down tracks will not be built at the same time. Instead, a single-track up energy storage and down power generation method is adopted. In actual applications, a single-function driving station and power station are generally used. Therefore, on a slope track, the train may be driven up or generate electricity down, and the driving station and the power station are arranged on the entire slope track. On the one hand, it occupies a large area and has high space limitations. On the other hand, the application cost of the two sets of station arrangements is also very high. Therefore, the present invention aims to solve this technical problem. Utility Model Content

[0004] To solve the above problems, the present invention proposes a track-type gravity energy storage power station, which is arranged on a track with a train running on the track. Drive plates are arranged on both sides of the bottom of the train. The power station includes a support seat, a friction wheel, a transmission member, a permanent magnet synchronous motor, a PLC control cabinet, and a battery energy storage control cabinet. The friction wheel is slidably arranged on the support seat and is transmission-connected to the permanent magnet synchronous motor through the transmission member. When the train passes through the power station, the friction wheel is frictionally connected to the train drive plate. The permanent magnet synchronous motor is electrically connected to the battery energy storage control cabinet through a first on-off switch, and the permanent magnet synchronous motor is connected to the grid power supply through a second on-off switch. The battery energy storage control cabinet, the permanent magnet synchronous motor, the first on-off switch, and the second on-off switch are all electrically connected to the main controller in the PLC control cabinet. Multiple position sensors are arranged on the slope section of the track. The main controller controls the permanent magnet synchronous motor to operate as a generator when the train is in downhill transportation based on feedback from the position sensor, and controls the permanent magnet synchronous motor to operate as a motor otherwise.

[0005] Furthermore, the battery energy storage control cabinet includes an AC-DC converter, a DC chopper, and a battery pack. The output end of the permanent magnet synchronous motor is connected in series to the AC-DC converter, the DC chopper, and the battery pack via a first on-off switch. The AC-DC converter, the DC chopper, and the battery pack are all electrically connected to a main controller.

[0006] Furthermore, a four-quadrant frequency converter is provided in the PLC control cabinet, the four-quadrant frequency converter is electrically connected to the main controller, and the four-quadrant frequency converter controls the operating speed of the permanent magnet synchronous motor.

[0007] Furthermore, at least two position sensors at different positions are arranged at both ends of the track gradient section.

[0008] Furthermore, the power station is arranged on the outside of the track, the drive plate of the train is arranged on the outside of the wheel set, the permanent magnet synchronous motor of the power station is arranged above the friction wheel through the frame, and the power station is provided with two groups, which are symmetrically arranged on both sides of the track.

[0009] Furthermore, the power station is arranged in the track, the train drive plate is arranged on the inner side of the two wheel groups, the power station is accommodated in a box, and the box is arranged directly below the track. The power station has two groups of friction wheels and is arranged on the top of the support seat. The friction wheel connecting axis is perpendicular to the track, and the permanent magnet synchronous motor is arranged below the support seat. When the train passes through the power station, the two groups of friction wheels are pressed against the corresponding side drive plates.

[0010] Furthermore, the transmission member adopts a universal cross-shaft telescopic coupling, and the friction wheel shaft and the permanent magnet synchronous motor shaft are connected through the universal cross-shaft telescopic coupling.

[0011] Furthermore, the friction wheel is arranged on the support seat through a friction wheel seat, a slide rail is arranged on the top table of the support seat, a slider is arranged on the slide rail, and the friction wheel seat is arranged on the slider.

[0012] Furthermore, the friction wheel seat is connected to a mechanical tensioner or a hydraulic tensioner.

[0013] The beneficial effects of the utility model are as follows:

[0014] The rail-type gravity energy storage power station provided by the utility model can automatically switch between the driving mode and the power generation mode according to whether the train is going up or down when used on a slope track, thereby realizing one-station compatibility of power generation and driving, which not only meets the driving and power generation needs on the slope track, reduces the site layout space, but also greatly reduces the layout cost of the rail-type gravity energy storage power station. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the track-outer structure of the power station of the utility model;

[0016] Figure 2 This is a schematic diagram of the power generation-driving principle structure of the power station of the utility model;

[0017] Figure 3 This is a schematic diagram of the track-built-in structure of the power station of the utility model;

[0018] Figure numerals: track 1, train 2, flatbed carriage 3, drive plate 4, power station 5, support base 51, friction wheel 52, transmission part 53, permanent magnet synchronous motor 54, PLC control cabinet 6, battery energy storage control cabinet 7, frame 8, box 9, friction wheel seat 10, slider 11, slide rail 12. DETAILED DESCRIPTION

[0019] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific direction, be constructed, or operate in a specific direction. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0020] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0021] The present invention will be further described below with reference to the accompanying drawings:

[0022] like Figure 1-Figure 3 A rail-type gravity energy storage power station is shown, in which the power station 5 is arranged on the track 1, and a train 2 runs on the track 1. The train 2 is composed of multiple flatbed carriages 3 connected by universal joints. Each flatbed carriage 3 includes a frame, a loading plate arranged on the frame, wheel sets installed on both sides below the frame, and drive plates 4 arranged on both sides of the loading plate or on the inner side of the wheel sets. One end between adjacent drive plates 4 is provided with an adaptive notch to avoid collision and interference between the front and rear flatbed carriage drive plates 4 when the rail train climbs a slope or turns.

[0023] The power station includes a support base 51, a friction wheel 52, a transmission part 53, a permanent magnet synchronous motor 54, a PLC control cabinet 6, and a battery energy storage control cabinet 7. The battery energy storage control cabinet 7 is arranged next to the power station 5. A conventional group of power stations 5 is equipped with a group of battery energy storage control cabinets 7. The PLC control cabinet 6 electrically connects all power stations and battery energy storage control cabinets 7.

[0024] The friction wheel 52 is slidingly set on the support seat 51, and the friction wheel 52 is transmission-connected to the permanent magnet synchronous motor 54 through the transmission member 53. When the train 2 passes the power station 5, the friction wheel 52 is frictionally connected to the train 2 drive plate 4, and its permanent magnet synchronous motor 54 is electrically connected to the battery energy storage control cabinet 7 through the first on-off switch. The permanent magnet synchronous motor 54 is connected to the grid power supply through the second on-off switch. The battery energy storage control cabinet 7, the permanent magnet synchronous motor 54, the first on-off switch, and the second on-off switch are all electrically connected to the main controller in the PLC control cabinet 6. Multiple position sensors are provided on the slope section of the track 2. The main controller controls the permanent magnet synchronous motor 54 to operate as a generator when the train 2 is in downhill transportation based on the feedback from the position sensor, and otherwise controls the permanent magnet synchronous motor 54 to operate as a motor.

[0025] At least two position sensors at different positions are arranged at both ends of the slope section of track 2. When train 2 moves, it passes through two position sensors, and its position sensors send signals to the main controller. The main controller can determine whether train 2 is going up or down based on the comparison of the position signals of the two position sensors.

[0026] like Figure 2 As shown, it is a schematic diagram of the power generation-drive principle structure of the power station. When the main controller obtains the downlink signal of train 2, it controls the four-quadrant inverter to operate the permanent magnet synchronous motor 54 as a generator, and at the same time connects the first on-off switch and disconnects the second on-off switch. The permanent magnet synchronous motor 54 is electrically connected to the battery energy storage control cabinet 7 through the first on-off switch. The battery energy storage control cabinet 7 includes an AC-DC converter, a DC chopper, and a battery pack. The output end of the permanent magnet synchronous motor 54 is connected in series with the AC-DC converter, the DC chopper, and the battery pack via the first on-off switch. The AC-DC converter, The DC chopper and the battery pack are electrically connected to the main controller. The train 2 descends freely under the gravitational potential energy. When passing the power station 5, the driving plate 4 of the train 2 squeezes the friction wheel 52. The driving plate 4 drives the friction wheel 52 to rotate through friction, so that the gravitational potential energy is converted into mechanical energy, thereby driving the permanent magnet synchronous motor 54. The permanent magnet synchronous motor 54 then converts the mechanical kinetic energy transmitted by the friction wheel 52 into alternating current, and the alternating current is converted into direct current through the AC-DC converter, and the direct current is stably stored in the battery pack through the DC chopper. Its AC-DC converter and DC chopper are both common circuit components.

[0027] Depending on the actual application, the power generation of the permanent magnet synchronous motor 54 can also be directly integrated into the grid power supply.

[0028] When the main controller obtains the train up signal, it controls the four-quadrant inverter to operate the permanent magnet synchronous motor 54 as an electric motor, disconnects the first on-off switch, and connects the second on-off switch, so that the grid power supply supplies power to the permanent magnet synchronous motor 54. The permanent magnet synchronous motor 54 outputs torque to drive the friction wheel 52 to rotate through the transmission member 53. When the train 2 passes the power station 5, the drive plate 4 squeezes the friction wheel 52 and transmits the driving force to the drive plate 4. The drive plate 4 drives the entire train 2 to transport on the track 1.

[0029] A four-quadrant frequency converter is provided in the PLC control cabinet 6 , which is electrically connected to the main controller. The four-quadrant frequency converter controls the operating speed of the permanent magnet synchronous motor 54 to realize the switching of the permanent magnet synchronous motor 54 as a generator or a motor.

[0030] The battery pack is also provided with a power detection unit for detecting the power value of the battery pack. The power detection unit is electrically connected to the main controller. When the main controller obtains the upward signal of train 2, during the peak period of power consumption in the power grid, the power feedback of the battery pack is sufficient. The main controller controls the second on-off switch to disconnect the power supply from the power grid, connects the first on-off switch, and controls the AC-DC converter, the DC chopper and the battery pack to reverse as a power supply to the permanent magnet synchronous motor. The DC chopper controls the DC power of the battery pack to be released to the AC-DC converter. The AC-DC converter converts the DC power into AC power that can be used by the permanent magnet synchronous motor 54. The permanent magnet synchronous motor 54 is powered and operates to output torque to drive the friction wheel 52 to rotate, thereby driving the train 2 to move forward through the friction of the drive plate 4. When the power value of the battery pack is too low, the main controller disconnects the first on-off switch and connects the second on-off switch, so that the power grid supplies power to the permanent magnet synchronous motor 54 to maintain normal operation.

[0031] The rail-type gravity energy storage power station can be widely used on the slope track 1. It can automatically switch between the driving mode and the power generation mode according to whether the train 2 is going up or down, thereby realizing the one-station compatibility of power generation and driving. It not only meets the driving and power generation needs on the slope track, reduces the site layout space, but also greatly reduces the layout cost of the rail-type gravity energy storage power station 5.

[0032] like Figure 1 As shown, it is a schematic diagram of the track-external structure of the track-type gravity energy storage power station. The power station 5 is arranged on the outside of the track 1. There are multiple groups of power stations 5 arranged along the track 1. The drive plate 4 of the train 2 is arranged on the outside of the wheel group. The permanent magnet synchronous motor 54 of the power station 5 is arranged above the friction wheel 52 through the frame 8. There are two groups of power stations 5, which are symmetrically arranged on both sides of the track 1.

[0033] like Figure 3 As shown, it is a schematic diagram of the track-built-in structure of the track-type gravity energy storage power station. The power station 5 is arranged in the track 1, the train 2 drive plate 4 is arranged on the inner side of the two wheel groups, the power station 5 is accommodated in the box 9, and the box 9 is arranged directly below the track 1. There are two groups of friction wheels 52 of the power station 5 and they are arranged on the top of the support seat 51. The connecting axis of the friction wheel 52 is perpendicular to the track 1, and the permanent magnet synchronous motor 54 is arranged below the support seat 51. When the train 2 passes the power station 5, the two groups of friction wheels 52 are pressed against the corresponding side drive plate 4, and the transmission member 53 adopts a universal cross-shaft telescopic coupling. The rotating shaft of the friction wheel 52 and the rotating shaft of the permanent magnet synchronous motor 54 are connected by a universal cross-shaft telescopic coupling, and the permanent magnet synchronous motor 54 is arranged on both sides below the support seat 51.

[0034] The friction wheel 52 is arranged on the support seat 51 through the friction wheel seat 10. A slide rail 12 is arranged on the top table of the support seat 51. A slider 11 is arranged on the slide rail 12. The friction wheel seat 10 is arranged on the slider 11.

[0035] The friction wheel seat 10 is connected to a mechanical tensioner or a hydraulic tensioner. The mechanical tensioner can use tensioning wire rope pulling and heavy hammer tensioning methods, and the hydraulic tensioner can use a telescopic linear push rod. Both of them provide sufficient tensioning force when the drive plate and the friction plate are frictionally connected, so that the driving force of the drive plate and the friction wheel is better transmitted, thereby ensuring the stable operation of the power station.

[0036] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention, and such changes and improvements shall fall within the scope of the present invention as claimed.

Claims

1. A rail-type gravity energy storage power station, characterized in that: The power station is arranged at the track, a train is running on the track, and drive plates are arranged on both sides of the bottom of the train. The power station includes a support seat, a friction wheel, a transmission member, a permanent magnet synchronous motor, a PLC control cabinet, and a battery energy storage control cabinet. The friction wheel is slidably arranged on the support seat, and the friction wheel is transmission-connected to the permanent magnet synchronous motor through the transmission member. When the train passes through the power station, the friction wheel is frictionally connected to the train drive plate. The permanent magnet synchronous motor is electrically connected to the battery energy storage control cabinet through a first on-off switch, and the permanent magnet synchronous motor is connected to the grid power supply through a second on-off switch. The battery energy storage control cabinet, the permanent magnet synchronous motor, the first on-off switch, and the second on-off switch are all electrically connected to the main controller in the PLC control cabinet. A plurality of position sensors are arranged on the slope section of the track. The main controller controls the permanent magnet synchronous motor to operate as a generator when the train is in downhill transportation based on feedback from the position sensor, and controls the permanent magnet synchronous motor to operate as a motor otherwise.

2. A rail-type gravity energy storage power station according to claim 1, characterized in that: The battery energy storage control cabinet includes an AC-DC converter, a DC chopper, and a battery pack. The output end of the permanent magnet synchronous motor is connected in series to the AC-DC converter, the DC chopper, and the battery pack via a first on-off switch. The AC-DC converter, the DC chopper, and the battery pack are all electrically connected to a main controller.

3. A rail-type gravity energy storage power station according to claim 2, characterized in that: A four-quadrant frequency converter is provided in the PLC control cabinet. The four-quadrant frequency converter is electrically connected to the main controller, and the four-quadrant frequency converter controls the operating speed of the permanent magnet synchronous motor.

4. The rail-type gravity energy storage power station according to claim 1, characterized in that: At least two position sensors at different positions are arranged at both ends of the track gradient section.

5. The rail-type gravity energy storage power station according to claim 1, characterized in that: The power station is arranged outside the track, the driving plate of the train is arranged outside the wheel group, the permanent magnet synchronous motor of the power station is arranged above the friction wheel through the frame, and the power station is provided with two groups, which are symmetrically arranged on both sides of the track.

6. The rail-type gravity energy storage power station according to claim 1, characterized in that: The power station is arranged in the track, the train drive plate is arranged on the inner side of the two wheel groups, the power station is accommodated in a box, and the box is arranged directly below the track. The power station has two groups of friction wheels and is arranged on the top of the support seat. The friction wheel connecting axis is perpendicular to the track, and the permanent magnet synchronous motor is arranged below the support seat. When the train passes through the power station, the two groups of friction wheels are pressed against the corresponding side drive plates.

7. The rail-type gravity energy storage power station according to claim 6, characterized in that: The transmission member adopts a universal cross-shaft telescopic coupling, and the friction wheel rotating shaft and the permanent magnet synchronous motor rotating shaft are connected through the universal cross-shaft telescopic coupling.

8. A rail-type gravity energy storage power station according to any one of claims 1 to 7, characterized in that: The friction wheel is arranged on the support seat through a friction wheel seat, a slide rail is arranged on the top table of the support seat, a slider is arranged on the slide rail, and the friction wheel seat is arranged on the slider.

9. The rail-type gravity energy storage power station according to claim 8, characterized in that: The friction wheel seat is connected to a mechanical tensioner or a hydraulic tensioner.

Images