Gravity energy storage workstation and device based on ditch

Abstract

The invention provides a ditch-based gravity energy storage workstation. The ditch-based gravity energy storage workstation comprises a ditch as well as a rack, a generator motor, a suspension module, a gravity module and a synchronous power-assisted module which are all located within the occupied area range of the ditch, the gravity module comprises a plurality of weights arranged along the length direction of the ditch; the suspension module comprises a winding drum wound with a first steel wire rope and a plurality of pulley blocks, the winding drum is connected with a generator motor, and each pulley block is connected with a corresponding weight; one end of the first steel wire rope is fixed on the winding drum, and the other end sequentially penetrates through the pulley blocks to be connected with the rack; the synchronous power assisting module is connected between two adjacent heavy objects and is used for overcoming friction force between a pulley and a wheel shaft in the pulley block and ensuring up-and-down synchronous movement of each heavy object; the generator motor is connected with the new energy power generation system. The defects that due to friction force of a pulley block, the motion strokes of heavy objects are not synchronous, shutdown adjustment is needed, and the working efficiency is reduced are overcome, the construction cost is low, and large-capacity energy storage and energy release can be achieved.

Description

TECHNICAL FIELD

[0001] The present disclosure belongs to the field of wind power generation and potential energy storage, and particularly relates to a trench-based gravity energy storage station and device. BACKGROUND

[0002] Wind energy and solar energy are both renewable energy, as they come from nature, so they will not be depleted, and this feature makes wind power generation and photovoltaic power generation a good choice for sustainable development of power supply. Compared with fossil fuel power generation, wind power generation and photovoltaic power generation can significantly reduce carbon dioxide and other greenhouse gas emissions, helping to mitigate the impact of global warming. However, due to natural and technical factors, wind power generation and photovoltaic power generation have the characteristics of intermittency, randomness and poor dispatchability, which will cause a series of power quality problems, mainly including grid voltage fluctuations, flicker phenomena, frequency fluctuations and voltage distortion caused by weather, etc. Especially when large-scale new energy power generation is connected to the grid, the above problems will be further aggravated, which will have a greater negative impact on the power system. Therefore, the grid must control the access of new energy power generation within a controllable range to minimize adverse effects, which not only restricts the construction scale and development speed of these two new energy sources, but also leads to coal-fired power plants, which have greater environmental damage and carbon emission, still being the main power generation to ensure the smooth operation of the grid. With the continuous development of new energy power generation, part of the power generation capacity of the above two new energy sources is often not utilized, so that new energy power generation enterprises cannot obtain the expected investment income. Therefore, a good energy storage device with economic and safety is needed between the new energy power generation station and the main grid to completely absorb the unstable power generated by photovoltaic and wind power generation, and then generate power according to the needs of the grid, which can provide stable power for a period of time, and can well solve the above problems. Therefore, people are also trying to research gravity energy storage technology.

[0003] Gravity energy storage uses a rotating generator motor to lift a load to a height when electricity is abundant, converting the electrical energy into gravitational potential energy. When electricity is needed, gravity lowers the load, allowing the suspension mechanism to drive the generator motor for power generation. Currently, gravity energy storage systems are primarily constructed in existing abandoned mines or by excavating deep vertical shafts. However, these systems are limited in suitable locations, have infrastructure costs prohibitive, or cannot be deployed near renewable energy power stations. Some systems also utilize tall reinforced concrete frames constructed from the ground up. However, this approach can result in infrastructure costs accounting for over 80% of the total system cost, making the per-kilowatt-hour cost of gravity energy storage significantly higher than other energy storage methods, hindering the widespread application of gravity energy storage technology. For example, in the Shagohuang area, where the surface soil is soft and the deeper layers are rocky, deep vertical shafts are less economical for gravity energy storage. Some researchers have also proposed to use a drum, a steel wire rope and a pulley group including a fixed pulley and a movable pulley to construct a suspension mechanism at the Shagohuang New Energy Base, and use a steel wire rope to move a series of horizontally arranged heavy objects of the same mass up and down at the same time to achieve gravity energy storage. In this way, since the weight is dispersed and the up and down strokes of the heavy objects do not need to be very high, the construction cost of the reinforced concrete truss foundation can be greatly reduced. However, due to the remote geographical location of the Shagohuang New Energy Base, it is not suitable for energy storage systems that require large-scale infrastructure construction. Therefore, this gravity energy storage method has not been widely used and there is still room for improvement. Summary of the Invention

[0004] The present invention aims to solve one of the technical problems in the related art at least to a certain extent.

[0005] The applicant has discovered that a gravity energy storage method that uses a drum, a wire rope, and a pulley block including a fixed pulley and a movable pulley to construct a suspension mechanism, and uses a wire rope to simultaneously move a series of horizontally arranged weights of the same mass up and down, can significantly reduce the construction cost of a trench-based gravity energy storage device because the weight is dispersed and the weights do not have a very high up and down travel. It has also been discovered that due to the friction in the pulley block, the weights move up and down asynchronously after a slightly longer operation time. Generally, the weights closer to one end of the drum have better synchronization, while the weights farther away from the drum have poorer synchronization, resulting in a smaller travel relative to the frame. This results in the need to reduce the travel of the series of weights, reducing the energy storage capacity. For this reason, the device needs to be frequently shut down for adjustment, thereby affecting the efficiency of the energy storage device.

[0006] To this end, the present invention provides a trench-based gravity energy storage workstation and device. The present invention constructs a trench-based gravity energy storage workstation and further forms an energy storage device, which broadens the application scope of gravity energy storage and enables it to be applied in the vast Shagohuang new energy base, achieving large-capacity and multiple modes of energy storage and release, and high integration. By connecting the gravity energy storage device between the existing wind power or photovoltaic power generation system and the power grid, the above two types of new energy power generation are not directly connected to the grid, but are first stored by the gravity energy storage device; when the main power grid needs electricity, the gravity energy storage device releases energy. The energy release process of the gravity energy storage device is fully controllable, and the energy release time is relatively long, which solves the technical problems caused by the instability of the two types of new energy power generation, and creates conditions for the comprehensive establishment of a power supply pattern dominated by new energy and the reduction of environmental pollution caused by coal-fired power plants.

[0007] In order to achieve the above objectives, the present disclosure adopts the following technical solutions:

[0008] A first aspect of the present invention provides a trench-based gravity energy storage workstation, comprising a trench, and a rack, a generator motor, a suspension module, a gravity module, and a synchronous assist module all located within the trench's footprint.

[0009] The gravity module includes a plurality of weights spaced apart along the length of the trench;

[0010] The suspension module includes a drum wound with a first steel wire rope and a plurality of pulley groups. The drum is connected to the generator motor and supported within the frame. Each pulley group is connected to a corresponding weight in the gravity module. One end of the first steel wire rope is fixed to the drum, and the other end passes through each pulley group in sequence and is fixedly connected to the frame. As the number of turns of the first steel wire rope around the drum changes, the weights in the gravity module move up and down, causing the gravitational potential energy to change, thereby achieving energy storage and release.

[0011] The synchronous power-assisting module is connected between two adjacent weights to overcome the friction between the pulleys and the axles in the pulley assembly, ensuring the synchronous up and down movement of the weights;

[0012] The generator motor is connected to the new energy power generation system.

[0013] In some embodiments, the trench is laid out along a straight line on the ground and excavated downward from the ground to form a rectangular or trapezoidal trench with a wide top and narrow bottom cross-section. A segmented lining is provided on the inner surface of the trench. The lining is a reinforced concrete shell consistent with the cross-sectional profile of the trench, and the frame is supported on the lining.

[0014] In some embodiments, the trench has a depth of 6 meters to 30 meters, a length of 10 meters to 300 meters, and a thickness of the inner layer of 100 mm to 400 mm.

[0015] In some embodiments, the masses of the weights in the gravity module are equal, and the distance between two adjacent weights is 0.5 to 4 times the maximum transverse dimension of the cross section of the weight.

[0016] In some embodiments, the weights are filled with local sand and gravel or non-polluting industrial solid waste.

[0017] In some embodiments, any one of the following types of synchronous assist modules is simultaneously provided between each pair of adjacent heavy objects:

[0018] The pulley-type synchronous power-assisting module includes a second steel wire rope and a plurality of fixed pulleys, one end of the second steel wire rope is connected to the bottom end of one of the two adjacent weights closest to the drum, and the other end of the second steel wire rope passes through each fixed pulley in sequence and is connected to the top end of the other of the two adjacent weights;

[0019] The cylinder-type synchronous power-assisting module includes a double-acting cylinder arranged between two adjacent weights and coupled to each other through a cross-pipeline. Except for the first and last weights, each of which is equipped with a double-acting cylinder, the other weights are equipped with two independent double-acting cylinders under each other, which are coupled to the double-acting cylinders under the previous and next weights respectively.

[0020] The mechanical synchronous power-assisting module includes a linkage mechanism arranged between two adjacent heavy objects, the movable part of the linkage mechanism is connected to the bottom end of a corresponding heavy object, the fixed part of the linkage mechanism is connected to the trench or the frame, and each heavy object is respectively constrained by the guide part in the linkage mechanism.

[0021] In some embodiments, in the cylinder-type synchronous power-assisting module, one end of the cylinder piston push rod in the double-acting cylinder is connected to the bottom end of the corresponding weight, and the other end of the cylinder piston push rod needs to always extend out of the bottom outlet of the double-acting cylinder to ensure that the amount of oil sucked in or discharged by the cylinder piston push rod when moving downward and upward by the same distance is equal; the lower cylinder of the first double-acting cylinder connected to the bottom end of the previous weight is connected to the upper cylinder of the second double-acting cylinder connected to the bottom end of the next weight through the first pipeline in the cross pipeline, and the upper cylinder of the first double-acting cylinder is connected to the lower cylinder of the second double-acting cylinder through the second pipeline in the cross pipeline;

[0022] The transmission mode of the mechanical synchronous power-assisting module is selected from any one or more combinations of gear rack transmission, chain transmission, crank-connecting rod transmission, crank slider transmission, four-link transmission and gear transmission.

[0023] In some embodiments, the mechanical synchronous power-assisting module adopts a combination of gear rack transmission and chain transmission, and the linkage mechanism includes a chain, two gears, two racks, two sprockets and two guide rails; the first rack and the second rack are fixedly connected to the bottom ends of the previous weight and the next weight respectively, and the first rack and the second rack are guided by the first guide rail and the second guide rail respectively during the movement of the two weights, the first gear and the second gear are meshed with the first rack and the second rack respectively, the first sprocket is coaxially fixed to the first gear, the second sprocket is coaxially fixed to the second gear, and the first sprocket under the previous weight and the second sprocket under the next weight are connected by a chain.

[0024] A second aspect of the present invention provides a gravity energy storage device for a new energy power generation system, comprising a control system and a plurality of gravity energy storage workstations, each gravity energy storage workstation being connected to the control system via a control cable;

[0025] The gravity energy storage workstation adopts the gravity energy storage workstation according to any embodiment of the first aspect of the present invention;

[0026] The control system is used to open or close a corresponding number of the gravity energy storage workstations according to the energy storage or release capacity requirements of the new energy power generation system, and to control and monitor the equipment status in each gravity energy storage workstation.

[0027] In some embodiments, the control system includes an operation controller and a grid-connected control unit, a safety protection unit, a monitoring unit, a communication interface circuit, a user interface and a plurality of sensor units connected thereto; each sensor unit is respectively arranged in a corresponding gravity energy storage workstation, including a speed sensor for detecting the speed of the generator motor, a distance sensor for detecting the position of the upper surface of the heavy object and a force sensor for sensing the tension value of the first wire rope; the grid-connected control unit is used to connect the electric energy generated by the gravity energy storage device to the main power grid; the safety protection unit is used to deal with emergencies, and when the parameters exceed the preset working range, the energy storage workstation with the problem is shut down in time; the monitoring unit is used to monitor the working status of the gravity energy storage workstation in real time, and transmit the data to the operation controller, the A safety protection unit and the user interface; the communication interface circuit is used to realize data communication during the operation of the gravity energy storage device; the user interface is used to input user instructions, change parameters, and display the operating status, data and fault conditions of the gravity energy storage workstation; the operation controller is used for operating monitoring of the gravity energy storage workstation, including start-stop control, control of various electronic components and power grid monitoring, wherein the operation controller adjusts the generator motor according to the speed detected by the speed sensor so that the speed of the generator motor operates within the set speed range, the operation controller senses the real-time energy storage or release margin of the gravity module according to the distance detected by the distance measuring sensor to control the corresponding suspension module, and the operation controller also controls the corresponding suspension module according to the tension sensed by the force sensor.

[0028] The present invention has the following characteristics and beneficial effects:

[0029] The present invention incorporates a synchronous power-assist module within the energy storage station, enabling the weights within the station to move synchronously up and down, thus avoiding the drawbacks of asynchronous weight movement caused by friction in the pulley system, which necessitates downtime for adjustments and reduces efficiency. This invention can further increase the energy storage capacity of each energy storage station by increasing the number and quality of weights. Furthermore, at the Shagohuang New Energy Base, the weights can be formed using local sand and gravel or non-polluting industrial solid waste. Furthermore, the low cost of excavating and constructing trenches significantly reduces construction costs, paving the way for large-scale application of this energy storage device in the Shagohuang region.

[0030] The energy storage device of the present invention, as a supporting energy storage device for a new energy power plant, can realize large-capacity energy storage and energy release in various ways. Specifically, the energy storage capacity of the gravity energy storage device can store the electric energy generated by the corresponding new energy power plant at full load within a certain period of time. When the output of the new energy power plant decreases due to natural reasons or the power generation is small within a certain period of time, the gravity energy storage device starts a single or a small number of energy storage workstations to participate in energy storage; in the gravity energy storage device, it is possible to realize that a single or multiple energy storage workstations participate in energy storage or energy release at the same time, it is also possible to realize that all energy storage workstations participate in energy storage or energy release at the same time, it is also possible to realize that a single energy storage workstation participates in energy storage or energy release in succession, and it is also possible that some energy storage workstations participate in energy storage or energy release as a whole in succession. This not only ensures that the wind farm can still store energy in the case of light wind or constantly changing wind speed or the photovoltaic power plant can still store energy in the case of low-intensity light or constantly changing light intensity, but also this technical solution adopts a method of successive energy release of each energy storage workstation, which has the characteristic of longer energy release time. It can also meet the main power grid's requirement for a certain degree of flexibility in releasing electric energy from the gravity energy storage device by starting different numbers of energy storage workstations to generate electricity. More importantly, the new energy power plant does not directly supply electricity to the main power grid, but generates electricity and is connected to the grid through the gravity energy storage device. The electricity generated by the gravity energy storage device remains stable, thereby eliminating the adverse effects of the new energy power generation method on the main power grid and creating conditions for increasing the proportion of the above two types of new energy power generation in the power grid. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 1 is a schematic top view of a trench-based gravity energy storage workstation provided by an embodiment of the first aspect of the present invention;

[0032] Figure 2 yes Figure 1 AA section side view in;

[0033] Figure 3 yes Figure 1 Schematic diagram of a synchronous power assist module using a coupling cylinder and connecting pipes;

[0034] Figure 4 yes Figure 1 Schematic diagram of the mechanism used as a synchronous power-assisting module;

[0035] Figure 5 It is a schematic diagram of a gravity energy storage device;

[0036] Figure 6 yes Figure 5 A schematic diagram of the structure of the control system in the gravity energy storage device shown;

[0037] Reference numerals:

[0038] 100- Gravity energy storage workstation, 110- Suspension module, 111- Brake, 112- Reel, 113- Reel bracket, 114- Pulley block, 114a- Fifth fixed pulley, 114b- Sixth fixed pulley, 114c- Movable pulley, 115- First steel wire rope, 120- Pulley type synchronous power assist module, 121- Second steel wire rope, 122- First fixed pulley, 123- Second fixed pulley, 124- Third fixed pulley, 125- Fourth fixed pulley, 130- Cylinder type synchronous power assist module, 131- First double-acting cylinder, 1 32-Piston push rod, 133-Second pipeline, 134-First pipeline, 135-Second double-acting cylinder, 140-Mechanical synchronous power-assisting module, 141a-First gear, 141b-Second gear, 142a-First sprocket, 142b-Second sprocket, 143-Chain, 144a-First guide rail, 144b-Second guide rail, 145a-First rack, 145b-Second rack, 150-Gravity module, 151-Weight, 160-Frame, 170-Generator motor, 180-Trough, 181-Inner lining;

[0039] 200-control cable;

[0040] 300-control system, 310-sensing unit, 311-speed sensor, 312-distance sensor, 313-force sensor, 320-operation controller, 330-grid control unit, 340-safety protection unit, 350-monitoring unit, 360-communication interface circuit, 370-user interface. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solutions and advantages of this application more clearly understood, this application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0042] On the contrary, this application covers any alternatives, modifications, equivalents, and solutions made within the spirit and scope of this application as defined by the claims. Furthermore, to facilitate a better understanding of this application, certain specific details are described in detail below in the detailed description of this application. Those skilled in the art will be able to fully understand this application without these details.

[0043] In the description of the present disclosure, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present disclosure and simplifying the description, rather than indicating or implying that the basis or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present disclosure. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present disclosure, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0044] In the description of this disclosure, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "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 or electrical connections; direct connections or indirect connections through an intermediate medium; and can refer to internal communication between two components or the interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this disclosure based on specific circumstances.

[0045] In the present disclosure, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature includes the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0046] See also Figures 1 to 4 The first embodiment of the present invention provides a trench-based gravity energy storage workstation 100, comprising a trench 180, and a rack 160, a generator motor 170, a suspension module 110, a gravity module 150, and a synchronous assist module all located within the trench 180;

[0047] The gravity module 150 includes a plurality of weights 151 spaced apart along the length of the trench 180;

[0048] The suspension module 110 includes a drum 112 wound with a first steel wire rope 115 and a plurality of pulley blocks 114. The drum 112 is connected to a generator motor 170 and supported on one side of a gravity module 150 within a frame 160. Each pulley block 114 is connected to a corresponding weight 151 in the gravity module 150. One end of the first steel wire rope 115 is fixed to the drum 112, and the other end passes through each pulley block 114 in sequence before being fixedly connected to the frame 160. As the number of turns of the first steel wire rope 115 around the drum 112 changes, the weights 151 in the gravity module 150 move up and down, causing a change in gravitational potential energy, thereby achieving energy storage and release.

[0049] Synchronous power-assisting modules are connected between two adjacent weights 151 to overcome the friction between the pulleys and the axles in the pulley assembly 114 and ensure the synchronous upward and downward movement of each weight 151;

[0050] The generator motor 170 is connected to the new energy power generation system through a power cable.

[0051] In some embodiments, trench 180 is a trench laid out along a straight line on the ground and excavated downwards, forming a rectangular or trapezoidal cross-section with a width at the top and a narrowness at the bottom. The trench depth ranges from 6 to 30 meters, and the trench length ranges from 10 to 300 meters. A segmented lining 181 is provided on the inner surface of trench 180. This lining 181 is a reinforced concrete shell conforming to the cross-sectional profile of trench 180. The frame 160 is securely connected to the lining 181 via mounting hardware. In this application, multiple weights 151 are used to evenly distribute the positive pressure exerted by the frame 160 on the lining 181 over the entire length of the ground covered by the frame 160 on both sides of the trench 180. Therefore, the thickness of the lining 181 is designed to meet the strength requirements for supporting the frame 160 and preventing the trench 180 from collapsing, thereby reducing construction costs. Preferably, the thickness of the lining 181 can be set between 100 mm and 400 mm.

[0052] In this embodiment, the trench 180 is set in the Shagohuang area. The main function of the lining 181 is to prevent the collapse of sand on the underground side walls of the trench 180. The force exerted by the frame 160 and its internal components on the lining 181 is mainly borne by the sand layers on both sides of the trench 180.

[0053] In some embodiments, the rack 160 is a horizontal rack. It is recommended that only the lower part of the rack is not closed so that the energy storage workstation is as unaffected by weather as possible. The rack adopts a steel structure and can withstand the tension of the first steel wire rope 115 in the horizontal and vertical directions.

[0054] In some embodiments, the distance between two adjacent weights 151 in the gravity module 150 is 0.5 to 4 times the maximum lateral dimension of the cross section of the weight 151, facilitating the installation of the synchronous assisting module. In addition, to ensure the synchronous movement of the weights 151 up and down, the mass of each weight is required to be equal, and 2 to 60 weights 151 are arranged according to the length of the trench and the energy storage capacity requirement of the workstation.

[0055] To further reduce the construction cost of the gravity energy storage workstation, each weight 151 in the gravity module 150 can be filled with local sand or industrial solid waste that does not pollute to obtain, and the average density of the weight 151 is preferably greater than 1.5 g / cm3.

[0056] In some embodiments, to avoid the situation that the movement of each weight 151 in the gravity module 150 is not synchronized up and down due to the friction between the fixed pulley and the fixed pulley shaft, the movable pulley and the movable pulley shaft in the pulley block 114, any one of the following forms of synchronous assisting module is arranged between each two adjacent weights 151.

[0057] (1) Pulley type synchronous assisting module 120

[0058] Referring to Figure 2 , the pulley type synchronous assisting module 120 includes a second steel wire rope 121 and a plurality of fixed pulleys. One end of the second steel wire rope 121 is connected to the bottom end of one weight adjacent to the winding drum 112, and the other end of the second steel wire rope 121 is connected to the top end of the other weight after passing through each fixed pulley in turn. The selection of the second steel wire rope 121 only considers that it can overcome the friction, so as to reduce the cost. Optionally, in the present embodiment, the pulley type synchronous assisting module 120 connected between the adjacent two weights is provided with four fixed pulleys. One end of the second steel wire rope 121 is connected to the bottom end of the weight 151 adjacent to the winding drum 112, and the other end of the second steel wire rope 121 is connected to the top end of the other weight after successively passing through the first fixed pulley 122 and the second fixed pulley 123 rotatingly connected to the bottom of the inner liner 181, the third fixed pulley 124 and the fourth fixed pulley 125 in the upper part of the rack 160. For other adjacent two weights, the same way as described above is used to connect the second steel wire rope 121, so as to realize the synchronous movement of each weight 151 up and down.

[0059] (2) Oil cylinder type synchronous assisting module 130

[0060] Referring to Figure 3, the cylinder type synchronous assist module 130 includes a double-acting oil cylinder of the same specification arranged between two adjacent weights 151 and coupled to each other through a cross pipe. Except for the first and last weights each having a double-acting oil cylinder, the other weights 151 are each provided with two independent double-acting oil cylinders, which are coupled with the double-acting oil cylinders under the previous weight and the next weight respectively; one end of the oil cylinder piston push rod 132 in each double-acting oil cylinder is connected to the bottom end of the matching weight 151, and the other end of the oil cylinder piston push rod 132 needs to extend all the way out of the bottom outlet of the double-acting oil cylinder to ensure that the piston moves the same distance downward and upward to inhale or discharge the same amount of oil; in this embodiment, with the first The lower cylinder of the first double-acting cylinder 131 connected to the bottom end of a weight 151 is communicated with the upper cylinder of the second double-acting cylinder 135 connected to the bottom end of the second weight through the first pipeline 134 in the cross pipeline. The upper cylinder of the first double-acting cylinder 131 is communicated with the lower cylinder of the second double-acting cylinder 135 through the second pipeline 133 in the cross pipeline. For the other two adjacent weights, the mutually coupled double-acting cylinders are set in the same way as above. When the hydraulic oil of the upper cylinder of the double-acting cylinder matching the previous weight enters the lower cylinder of the double-acting cylinder under the next weight through the second pipeline 134, the two adjacent weights 151 can be moved up and down synchronously.

[0061] (3) Mechanism-type synchronous power assist module 140

[0062] The mechanical synchronous power-assisting module 140 adopts a linkage mechanism arranged between two adjacent weights 151. The movable part of each linkage mechanism is respectively connected to the bottom end of a corresponding weight 151, and the fixed part is connected to the lining 181 or the frame 160. Each weight 151 is respectively constrained by the guide part in the linkage mechanism. When the previous weight 151 moves up and down, the linkage mechanism enables the next weight 151 to overcome the friction inside the pulley and move up and down synchronously, so that all weights 151 can move up and down synchronously. In this embodiment, the linkage mechanism is preferably a combination of a gear rack drive and a chain drive. The linkage mechanism between two adjacent weights includes a first gear 141a, a second gear 141b, a first rack 145a, a second rack 145b, a first sprocket 142a, a second sprocket 142b, a chain 143, a first guide rail 144a, and a second guide rail 144b. The first rack 145a and the second rack 145b are fixedly connected to the bottom ends of the previous weight and the next weight, respectively. The first rack 145a and the second rack 145b move along with the two weights. During the movement of the weights, they are guided by the first guide rail 144a and the second guide rail 144b respectively. The first gear 141a and the second gear 141b are meshed with the first rack 145a and the second rack 145b respectively. The first sprocket 142a is coaxially fixed to the first gear 141a, and the second sprocket 142b is coaxially fixed to the second gear 141b. The first sprocket 142a under the previous weight and the second sprocket 142b under the next weight are connected by a chain 143. When the previous weight 151 moves upward, its lower end The connected first rack 145a moves upward under the constraint of the first guide rail 144a, driving the first gear 141a to rotate. The axis of the first gear 141a is rotatably connected to the liner 181 or the frame 160. Since the first gear 141a and the first sprocket 142a are coaxial structures, the first sprocket 142a rotates synchronously with the rotation of the first gear 141a, and the second sprocket 142b under the next weight rotates synchronously through the chain 143. The second sprocket 142b then drives the coaxially fixed second sprocket 142b under the next weight 151. The second gear 141b pushes the matching second rack 145b to move upward synchronously; similarly, when the previous weight 151 moves downward, the above-mentioned gears and sprockets rotate in opposite directions, so that the adjacent weights 151 move downward synchronously. It should be noted that, except for the first weight and the last weight, two sprockets are coaxially mounted on the gear shaft under each of the other weights, one of which shares a chain 143 with the matching sprocket under the previous weight, and the other sprocket shares a chain 143 with the matching sprocket 145 under the next weight. For other transmission methods, such as crank connecting rod, crank slider, four-bar connecting rod and gear transmission mechanisms or transmission methods using a combination of two or more mechanisms, the present invention is also applicable.

[0063] In this embodiment, a pulley-type synchronous power-assisting module 120 is used, and the generator motor 170, the drum 112, the fixed pulley in the pulley group 114 of the suspension module 110, and the fixed pulley of the synchronous power-assisting module 120 located above the heavy object are all rotatably connected to the frame 160. The frame 160 is fixedly connected to the ground part of the trench lining 190, and the cross-sectional shape of the trench 180 is rectangular.

[0064] In some embodiments, each pulley assembly 114 within the suspension module 110 has the same structure, each including at least two fixed pulleys and at least one movable pulley. Preferably, a single pulley assembly 114 includes a fifth fixed pulley 114a, a sixth fixed pulley 114b, and a movable pulley 114c. A first steel wire rope 115 enters the pulley assembly 114 via the fifth fixed pulley 114a, then passes through the movable pulley 114c and exits the pulley assembly 114 via the sixth fixed pulley 114b. The movable pulley 114c is connected to a weight 151, and as the pulley 114c moves up and down, the weight 151 moves synchronously.

[0065] In some embodiments, the suspension module 110 further includes a brake 111 and a reel support 113 . The reel support 113 is fixed to the frame 160 . The reel 112 is rotatably connected to the reel support 113 . The rotating part of the brake 111 is connected to the reel 112 , thereby braking the reel 112 .

[0066] In this embodiment, the brake 111 is preferably an electromagnetic power-off brake. The drum 112 can rotate when powered on and is braked when powered off, to ensure that the suspension module 110 is in a braking state most of the time when not working.

[0067] In some embodiments, the generator motor 170 is designed as a structure that integrates a motor and a reducer. When the generator motor 170 is used as a motor, the speed of its output shaft is reduced by the reducer. Similarly, when the generator motor 170 is used as a generator, the speed of its input shaft is increased by the reducer and then transmitted to the motor rotor to generate electricity.

[0068] It is understandable that the gravity energy storage workstation provided by this embodiment can be used at the Shagohuang New Energy Base to fill the heavy objects with local sand and gravel or solid waste that does not produce pollution. Large-scale trench excavation does not require considering the land occupation cost. If the gravity energy storage workstation form of the pulley-type synchronous power-assisting module 120 is used, in addition to the drum and the generator motor, the maximum equipment expenditure is the cost of the frame, wire rope and pulley set. Compared with other energy storage forms, the cost of the energy storage device can be greatly reduced, and it has the characteristics of being non-flammable and non-explosive. This embodiment ensures that all heavy objects can move synchronously during the operation of the gravity energy storage workstation by adding a synchronous power-assisting module between the heavy objects. This ensures that the energy storage stroke of the heavy objects in the actual operation of the gravity energy storage workstation is consistent with the design, avoiding frequent shutdown adjustments of the gravity energy storage workstation, thereby ensuring the working efficiency of the energy storage workstation.

[0069] See also Figures 5-6 The second aspect of the present invention provides a gravity energy storage device, comprising a control system 300 and a plurality of gravity energy storage workstations 100, wherein each gravity energy storage workstation 100 is connected to the control system 300 via a control cable 200;

[0070] The gravity energy storage workstation 100 adopts the gravity energy storage workstation proposed in accordance with the embodiment of the first aspect of the present invention;

[0071] The control system 300 is used to open or close a corresponding number of gravity energy storage workstations 100 according to the energy storage or release capacity requirements of the new energy power generation system, and to control and monitor the equipment status in each gravity energy storage workstation 100.

[0072] In some embodiments, the control system 300 includes an operation controller 320 and a grid-connected control unit 330, a safety protection unit 340, a monitoring unit 350, a communication interface circuit 360, a user interface 370, and a sensor unit 310 connected thereto; Figure 1 、 Figure 2, each sensing unit 310 is respectively arranged in a corresponding gravity energy storage workstation 100, including a speed sensor 311 for detecting the speed of the generator motor, a distance sensor 312 for detecting the position of the upper surface of the weight 151 and a force sensor 313 for sensing the tension value of the first wire rope; the grid-connected control unit 330 is used to connect the electric energy generated by the gravity energy storage device to the main power grid; the safety protection unit 340 is used to deal with emergencies. When the parameters exceed the preset working range, the gravity energy storage workstation 100 with the problem is shut down in time; the monitoring unit 350 is used to monitor the working status of each gravity energy storage workstation 100 in real time and transmit the data to the operation controller 320, the safety protection unit 340 and the user interface 370; the communication interface circuit 360 is used to realize data communication during the working process of the gravity energy storage device; the user interface 370 is used to input user instructions, change parameters, and display the status of each gravity energy storage workstation 10 0's operating status, data and fault conditions; the operation controller 320 is used to monitor the operation of the gravity energy storage workstation 100, including start-stop control, control of various electronic components and power grid monitoring. Among them, the operation controller 320 adjusts the generator motor 170 according to the speed detected by the speed sensor 311, so that the speed of the generator motor 170 operates within the set speed range. The operation controller 320 senses the real-time energy storage or release margin of the corresponding gravity energy storage workstation 100 according to the distance detected by the distance sensor 312 to control the corresponding suspension module 110. The operation controller 320 also controls the corresponding suspension module 110 according to the tension sensed by the force sensor 313. When the fixed pulley or movable pulley on a pulley group is stuck, causing the tension of the wire rope to exceed the specified tension value, or when there is no tension value when the wire rope is broken, the operation controller 320 will shut down the gravity energy storage workstation 100 in time according to the force value feedback from the force sensor 313.

[0073] In some embodiments, the operation process of the gravity energy storage device includes:

[0074] During energy storage operation:

[0075] The control system 300 opens a corresponding number of gravity energy storage workstations 100 according to the energy storage capacity requirements of the new energy power plant. In the opened gravity energy storage workstations 100, the control system 300 releases the brakes of the suspension modules 110 corresponding to the gravity modules 150, and at the same time connects the power cables to start the generator motor 170. As each weight 151 moves upward, the gravitational potential energy of the gravity energy storage workstation 100 gradually increases. When the distance measuring sensor 312 detects that the weight 151 has reached the first set position, it is determined that all the weights 151 in the gravity module 150 are at full load energy storage, then the suspension module 110 is braked, and the gravity energy storage workstation 100 completes energy storage. The control system 300 starts the remaining gravity energy storage workstations 100 according to the same steps as above until all the gravity modules 150 in the opened gravity energy storage workstations 100 are fully loaded. After the energy storage is completed, the control system 300 disconnects the power cable and brakes the generator motor 170; if there is still surplus electric energy to be stored, the control system 300 will continue to open the remaining gravity energy storage workstations 100 that have not yet achieved full-load energy storage. When all gravity energy storage workstations 100 are fully loaded with energy storage, the energy storage operation is completed; when a single or part of the gravity energy storage workstations 100 are storing energy and there is an unexpected situation where there is no energy storage capacity, the control system 300 disconnects the power cable to brake the corresponding generator motor 170, and at the same time brakes all the suspension modules 110 that are storing energy, and the energy storage operation of the gravity energy storage workstation 100 is suspended. If there is a subsequent energy storage requirement, the gravity energy storage workstation 100 whose energy storage operation is suspended will continue the energy storage operation until the gravity energy storage workstation 100 achieves full-load energy storage, and finally achieves full-load energy storage of the energy storage device;

[0076] During energy release operation:

[0077] The control system 300 opens a corresponding number of gravity energy storage workstations 100 according to the required energy release capacity. In the opened gravity energy storage workstations 100, the control system 300 first connects the power cable to start the generator motor 170. The control system 300 first releases the brake on the suspension module 110, so that the drum 112 can release the first steel wire rope 115, so that the generator motor 170 is ready to generate electricity. Then, each weight 151 drives the generator motor 170 to generate electricity through the suspension module 110 with the help of gravity. When the distance sensor 312 detects that the weight 151 has reached the second set position, it indicates that the gravity module 150 is Before reaching full load energy release, the control system 300 brakes the suspension module 110, and the energy release of the gravity energy storage workstation 100 is completed; when the gravity energy storage workstation 100 is releasing energy and an unexpected situation occurs where energy release is not required, the control system 300 first disconnects the power cable and brakes the generator motor 170, and at the same time brakes the suspension module 110 that is releasing energy, and the energy release operation of the gravity energy storage workstation 100 is suspended. If there is a subsequent energy release requirement, the gravity energy storage workstation 100 that has been suspended from the energy release operation continues the energy release operation until the full load energy release of the gravity energy storage workstation 100 is achieved, and finally the full load energy release of the energy storage device is achieved.

[0078] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present disclosure. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0079] Although the embodiments of the present disclosure have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and alterations may be made to the embodiments without departing from the principles and spirit of the present disclosure, the scope of which is defined by the claims and their equivalents.

Claims

1. A trench-based gravity energy storage workstation, characterized in that: It includes a trench, and a frame, a generator motor, a suspension module, a gravity module, and a synchronous power assist module all located within its footprint; The gravity module includes a plurality of weights spaced apart along the length of the trench; The suspension module includes a drum wound with a first steel wire rope and a plurality of pulley groups. The drum is connected to the generator motor and supported within the frame. Each pulley group is connected to a corresponding weight in the gravity module. One end of the first steel wire rope is fixed to the drum, and the other end passes through each pulley group in sequence and is fixedly connected to the frame. As the number of turns of the first steel wire rope around the drum changes, the weights in the gravity module move up and down, causing the gravitational potential energy to change, thereby achieving energy storage and release. The synchronous power-assisting module is connected between two adjacent weights to overcome the friction between the pulleys and the axles in the pulley assembly, ensuring the synchronous up and down movement of the weights; The generator motor is connected to the new energy power generation system.

2. The gravity energy storage workstation according to claim 1, characterized in that: The trench is laid out along a straight line on the ground and excavated downward from the ground to form a rectangular or trapezoidal trench with a wide top and narrow bottom cross-section. A segmented lining is provided on the inner surface of the trench. The lining is a reinforced concrete shell consistent with the cross-sectional profile of the trench, and the frame is supported on the lining.

3. The gravity energy storage workstation according to claim 2, characterized in that: The depth of the trench is 6 meters to 30 meters, the length is 10 meters to 300 meters, and the thickness of the inner layer is 100 mm to 400 mm.

4. The gravity energy storage workstation according to claim 1, characterized in that: The masses of the weights in the gravity module are equal, and the distance between two adjacent weights is 0.5 to 4 times the maximum transverse dimension of the cross section of the weight.

5. The gravity energy storage workstation according to claim 1, characterized in that: The weights are made of local sand and gravel or non-polluting industrial solid waste.

6. The gravity energy storage workstation according to claim 1, characterized in that: Any one of the following synchronous assist modules is simultaneously provided between each pair of adjacent heavy objects: The pulley-type synchronous power-assisting module includes a second steel wire rope and a plurality of fixed pulleys, one end of the second steel wire rope is connected to the bottom end of one of the two adjacent weights closest to the drum, and the other end of the second steel wire rope passes through each fixed pulley in sequence and is connected to the top end of the other of the two adjacent weights; The cylinder-type synchronous power-assisting module includes a double-acting cylinder arranged between two adjacent weights and coupled to each other through a cross-pipeline. Except for the first and last weights, each of which is equipped with a double-acting cylinder, the other weights are equipped with two independent double-acting cylinders under each other, which are coupled to the double-acting cylinders under the previous and next weights respectively. The mechanical synchronous power-assisting module includes a linkage mechanism arranged between two adjacent heavy objects, the movable part of the linkage mechanism is connected to the bottom end of a corresponding heavy object, the fixed part of the linkage mechanism is connected to the trench or the frame, and each heavy object is respectively constrained by the guide part in the linkage mechanism.

7. The gravity energy storage workstation according to claim 6, characterized in that: The cylinder-type synchronous power-assisting module, one end of the cylinder piston push rod in the double-acting cylinder is connected to the bottom end of the corresponding weight, and the other end of the cylinder piston push rod needs to always extend out of the bottom outlet of the double-acting cylinder to ensure that the amount of oil sucked in or discharged by the cylinder piston push rod when moving downward and upward by the same distance is equal; the lower cylinder of the first double-acting cylinder connected to the bottom end of the previous weight is connected to the upper cylinder of the second double-acting cylinder connected to the bottom end of the next weight through the first pipeline in the cross pipeline, and the upper cylinder of the first double-acting cylinder is connected to the lower cylinder of the second double-acting cylinder through the second pipeline in the cross pipeline; The transmission mode of the mechanical synchronous power-assisting module is selected from any one or more combinations of gear rack transmission, chain transmission, crank-connecting rod transmission, crank slider transmission, four-link transmission and gear transmission.

8. The gravity energy storage workstation according to claim 6, characterized in that: The mechanical synchronous power-assisting module adopts a combination of gear rack transmission and chain transmission, and the linkage mechanism includes a chain, two gears, two racks, two sprockets and two guide rails; the first rack and the second rack are fixedly connected to the bottom ends of the previous weight and the next weight respectively, and the first rack and the second rack are guided by the first guide rail and the second guide rail respectively during the movement of the two weights, the first gear and the second gear are meshed with the first rack and the second rack respectively, the first sprocket is coaxially fixed to the first gear, and the second sprocket is coaxially fixed to the second gear, and the first sprocket under the previous weight and the second sprocket under the next weight are connected by a chain.

9. A gravity energy storage device for a new energy power generation system, characterized in that: It includes a control system and multiple gravity energy storage workstations, each of which is connected to the control system via a control cable; The gravity energy storage workstation adopts the gravity energy storage workstation according to any one of claims 1 to 8; The control system is used to open or close a corresponding number of the gravity energy storage workstations according to the energy storage or release capacity requirements of the new energy power generation system, and to control and monitor the equipment status in each gravity energy storage workstation.

10. The gravity energy storage device according to claim 9, characterized in that: The control system includes an operation controller and a grid-connected control unit, a safety protection unit, a monitoring unit, a communication interface circuit, a user interface, and a plurality of sensor units connected thereto; each sensor unit is respectively arranged in a corresponding gravity energy storage workstation, including a speed sensor for detecting the speed of the generator motor, a distance sensor for detecting the position of the upper surface of the weight, and a force sensor for sensing the tension value of the first steel wire rope; the grid-connected control unit is used to connect the electric energy generated by the gravity energy storage device to the main power grid; the safety protection unit is used to handle emergencies and, when the parameters exceed the preset working range, promptly shut down the energy storage workstation with the problem; The monitoring unit is used to monitor the working status of the gravity energy storage workstation in real time and transmit the data to the operation controller, the safety protection unit and the user interface; The communication interface circuit is used to realize data communication during the operation of the gravity energy storage device; The user interface is used to input user instructions, change parameters, and display the operating status, data and fault conditions of the gravity energy storage workstation; the operation controller is used to monitor the operation of the gravity energy storage workstation, including start-stop control, control of various electronic components and power grid monitoring, wherein the operation controller adjusts the generator motor according to the speed detected by the speed sensor so that the speed of the generator motor operates within the set speed range, the operation controller senses the real-time energy storage or release margin of the gravity module according to the distance detected by the distance measuring sensor to control the corresponding suspension module, and the operation controller also controls the corresponding suspension module according to the tension sensed by the force sensor.

Images