Disaster-resistant multi-microgrid low-voltage interconnection device and control method thereof

Abstract

The invention relates to a disaster-resistant multi-microgrid low-voltage interconnection device and a control method thereof.The disaster-resistant multi-microgrid low-voltage interconnection device comprises a cabinet body, a first bearing frame, a second bearing frame, a low-voltage interconnection assembly, an external bearing frame, a floating unit, a detection unit and a guide rail, the low-voltage interconnection assembly is installed in the cabinet body, and the guide rail is installed on the external bearing frame; the first bearing frame and the second bearing frame are both installed on the guide rail, the cabinet body is installed between the first bearing frame and the second bearing frame, the floating unit is installed between the first bearing frame and the external bearing frame, and the detection unit is installed in the first bearing frame and the cabinet body. The low-voltage interconnection assembly is connected with the floating unit and the detection unit. The low-voltage interconnection assembly is used for receiving circuit signals between the detection units and water level signals of the detection units and judging whether to send alarm signals or not. When the flood level reaches an early warning condition, the floating unit provides upward buoyancy, so that the floating unit is lifted to quickly leave a flood submerging area.

Description

Technical Field

[0001] This invention relates to the field of disaster-resistant power equipment technology, and in particular to a disaster-resistant multi-microgrid low-voltage interconnection device and its control method. Background Technology

[0002] Multi-microgrid systems are used to ensure the reliability of regional power supply, while multi-microgrid low-voltage interconnection devices, as the core hub of the system, undertake important functions such as low-voltage electrical connection, power dispatch and operation control between multiple microgrids. They are widely used in rural areas, industrial parks, remote communities and other areas that are susceptible to extreme weather.

[0003] Multi-microgrid low-voltage interconnection devices connect multiple adjacent microgrids through interconnection devices, enabling energy sharing and improving the overall system's stability and disaster resistance. However, existing multi-microgrid interconnection devices are usually fixed installations, with their cabinets directly fixed to the ground or foundation. In the face of natural disasters such as floods, these devices are easily submerged by floodwaters, causing internal electrical equipment, such as switches and control units, to short-circuit, be damaged, or even explode due to water ingress. This not only causes huge economic losses but also interrupts the interconnection and support functions between microgrids, rendering them useless during critical disaster relief and power supply periods.

[0004] Chinese patent application CN118842407A discloses an outdoor disaster-resistant photovoltaic power generation device, including a buried frame with multiple sets of connecting rods fixedly installed on it. It also includes: a barrier limiting structure connected to the buried frame; a floating photovoltaic power generation structure movably connected to the connecting rods, the floating photovoltaic power generation structure including an electric gripper movably connected to the connecting rods, the electric gripper being fixedly connected to a floating platform via the connecting frame, a flood sensor fixedly installed on the floating platform, a deflection mechanism installed on the flood sensor, a photovoltaic panel fixedly installed on the deflection mechanism, and a controller fixedly installed on one side of the deflection mechanism; and a water-driven power supply structure installed under the floating platform. This patent, in the event of a flood, uses the combination of the barrier limiting structure and the floating photovoltaic power generation structure to prevent the photovoltaic panel from being submerged, providing protection for the photovoltaic panel. Although it achieves flood prevention, it relies on the buoyancy of the water for passive floating, resulting in a slow floating process. Furthermore, there is no good guidance during the floating process, making it prone to capsizing if the water flow is strong.

[0005] Therefore, how to quickly remove the device from the flood is an urgent problem to be solved. Summary of the Invention

[0006] The purpose of this invention is to overcome the defects of the prior art and provide a disaster-resistant multi-microgrid low-voltage interconnection device and its control method.

[0007] The objective of this invention can be achieved through the following technical solutions: According to one aspect of the present invention, a disaster-resistant multi-microgrid low-voltage interconnection device is provided, comprising a cabinet, a first support frame, a second support frame, a low-voltage interconnection component, an external support frame, a floating unit, a detection unit, and a guide rail. The low-voltage interconnection component is installed in the cabinet, the guide rail is installed on the external support frame, both the first and second support frames are installed on the guide rail, the cabinet is installed between the first and second support frames, the floating unit is installed between the first support frame and the external support frame, the detection unit is installed in the first support frame and the cabinet, and the low-voltage interconnection component is connected to the floating unit and the detection unit respectively. The low-voltage interconnect component is used to receive circuit signals between detection units and water level signals from the detection units, and to determine whether to send an alarm signal.

[0008] As a preferred technical solution, the buoyancy unit includes a base, an airbag body, and a gas generator. The base is mounted on a first support frame, the airbag body is connected to an external support frame base, and the gas generator is mounted on the base and located inside the airbag body.

[0009] As a preferred technical solution, the detection unit includes a water-containing cavity, a floating component, a conductive ring, and a flow-guiding hole. The water-containing cavity and the flow-guiding hole are both disposed in the first support frame. The floating component is placed in the water-containing cavity. The flow-guiding hole and the water-containing cavity are connected. The conductive ring is mounted on the floating component.

[0010] As a preferred technical solution, the guide hole is inclined, and the end of the guide hole that communicates with the water-containing cavity is higher than the other end of the guide hole.

[0011] As a preferred technical solution, the device further includes a power-collecting guide rod and a guide sleeve. The guide sleeve is installed on the first support frame and the cabinet, and the power-collecting guide rod is installed in the guide sleeve and connected to the floating component.

[0012] As a preferred technical solution, the detection unit further includes a detection slot and an electrical contact. The detection slot is located at the bottom of the cabinet, and the electrical contact is installed in the detection slot, with the electrical contact and the conductive ring aligned.

[0013] As a preferred technical solution, the detection unit further includes a first water level sensor with a sensing end, the first water level sensor being mounted on a first support frame, the sensing end protruding from a preset height and close to the external support frame.

[0014] As a preferred technical solution, the second support frame includes a sliding sleeve and a positioning pin with a fracture ring groove. The sliding sleeve and the guide rail are slidably connected and fixed by the positioning pin. The fracture ring groove is located at the contact point between the slider and the guide rail.

[0015] As a preferred technical solution, the device further includes anchor bolts and anchor cables, one end of the anchor cable is connected to the guide rail, and the other end of the anchor cable and the external support frame are both fixed by anchor bolts.

[0016] According to another aspect of the present invention, a control method is provided for a disaster-resistant multi-microgrid low-voltage interconnection device as described above, wherein the determination process includes: The low-voltage interconnection component detects the circuit signal of the detection unit every first preset time interval to determine whether the circuit is faulty. If a fault is detected, a first alarm signal is issued. If the low-voltage interconnection component receives a signal from the detection unit, it activates the floating unit and sends a second alarm signal. The cabinet slides along the guide rail under the action of the floating unit. If, after the floating unit is activated, the low-voltage interconnect component still receives the signal from the detection unit for a second preset time, the low-voltage interconnect component sends a third alarm signal and cuts off power immediately. If, after the floating unit is activated, the low-voltage interconnect component does not receive a signal from the detection unit for a third preset time, the low-voltage interconnect component sends a safety signal.

[0017] Compared with the prior art, the present invention has the following beneficial effects: 1. This invention incorporates a buoyancy unit and a detection unit. When the detection unit detects that the flood level has reached the warning condition, it automatically triggers the buoyancy unit, thereby providing upward buoyancy to the entire cabinet and lifting it up to quickly escape the flood-inundated area. This proactive physical lifting solution fundamentally changes the predicament of traditional fixed equipment passively enduring flooding, greatly enhancing the survivability of interconnected devices under extreme flood disasters and ensuring that core electrical functions are not damaged.

[0018] 2. This invention employs a dual detection mechanism combining a first water level sensor with a conductive ring and electrical contacts, and is configured to trigger flood control action only when both signals are simultaneously satisfied. This effectively distinguishes between real, continuously rising floodwaters and brief rain splashes or surface water accumulation, greatly improving the reliability and accuracy of the flood control system and avoiding unnecessary shutdowns or equipment actions caused by false triggering.

[0019] 3. This invention uses a positioning pin with a fracture ring groove to fix the second support frame to the guide rail, preventing the cabinet from sliding freely under normal conditions; at the same time, the fracture ring groove is set to artificially reduce the structural strength, and the positioning pin will not affect the sliding of the cabinet when the floating unit is working.

[0020] 4. This invention presets multiple judgment conditions, especially after floating, it can continuously judge the risk level based on the water level, and perform emergency power cut-off operations in extremely dangerous situations, while sending alarm signals to the remote monitoring center. This realizes a full-chain safety guarantee from local active protection to remote intelligent monitoring, providing real-time information for disaster assessment and emergency decision-making. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a side view of the overall structure of the present invention; Figure 3 This is a top view of the overall structure of the present invention; Figure 4 This is a schematic diagram of the low-voltage interconnect component of the present invention; Figure 5 This is a schematic diagram of the levitation unit of the present invention; Figure 6 This is a disassembled schematic diagram of the base of the present invention; Figure 7 This is a schematic diagram of the structure of the second water level detection component of the present invention; Figure 8 This is a schematic diagram of the structure of the floating component of the present invention; Figure 9 This is a schematic diagram of the detection groove of the present invention; Figure 10 This is a schematic diagram of the control process of the present invention.

[0022] 1. Cabinet; 11. First support frame; 12. Second support frame; 2. Low-voltage interconnection assembly; 21. Connection port; 22. Switch module; 23. Control unit; 24. Communication module; 25. Power supply module; 3. External support frame; 31. Guide rail; 32. Anchor bolt; 33. Anchor cable; 4. Floating unit; 41. First water level sensor; 42. Base; 43. Airbag body; 44. Gas generator; 45. Power supply rod; 46. Support rod; 5. Second water level detection assembly; 51. Detection groove; 52. Floating component; 53. Conductive ring; 54. Electrical contact; 55. Flow guide hole; 6. Positioning pin; 61. Fracture ring groove. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0024] Example 1 like Figures 1-9 As shown, a disaster-resistant multi-microgrid low-voltage interconnection device includes a cabinet 1, a first support frame 11, a second support frame 12, a low-voltage interconnection component 2, an external support frame 3, a floating unit 4, a detection unit, and a guide rail 31. The low-voltage interconnection component 2 is installed inside the cabinet 1, and the guide rail 31 is installed on the external support frame 3. The first support frame 11 and the second support frame 12 are both installed on the guide rail 31. The cabinet 1 is installed between the first support frame 11 and the second support frame 12. The floating unit 4 is installed between the first support frame 11 and the external support frame 3. The detection unit is installed in the first support frame 11 and the cabinet 1. The low-voltage interconnection component 2 is connected to the floating unit 4 and the detection unit, respectively. The low-voltage interconnection component 2 is used to receive circuit signals between detection units and water level signals of the detection units and to determine whether to send an alarm signal.

[0025] In this embodiment, cabinet 1 is made of stainless steel and has a sealed box structure with an insulating protective layer on the inner wall to house the core electrical components.

[0026] Low-voltage interconnection component 2: It is fixed to the middle layer inside the cabinet 1 by bolts and is used to realize low-voltage electrical connection and power dispatch control between multiple microgrids.

[0027] External support frame 3: This is a steel structure frame that is installed around the outside of cabinet 1 to support and fix the entire device from the outside.

[0028] Guide rail 31: connects cabinet 1 and external support frame 3, so that cabinet 1 can slide stably along the vertical direction of external support frame 3.

[0029] Floating unit 4: It is installed at the bottom of the cabinet 1 by means of a detachable structure. When a flood disaster is detected, it triggers the airbag body 43 to inflate rapidly to raise the cabinet 1 to a height away from the risk of flooding.

[0030] The first support frame 11 and the second support frame 12 are respectively installed at the bottom and top of the cabinet 1, so that the cabinet 1 can slide along the guide rail 31.

[0031] The detection unit is used to detect the water level. When the water level reaches the preset condition, it sends a signal to the low-pressure interconnection component 2 as a condition for starting the floating unit.

[0032] The second support frame 12 includes a sliding sleeve and a positioning pin 6 with a fracture ring groove 61. The sliding sleeve and the guide rail 31 are slidably connected and fixed by the positioning pin 6. The fracture ring groove 61 is located at the contact point between the slider and the guide rail 31.

[0033] The device also includes an anchor rod 32 and an anchor cable 33. One end of the anchor cable 33 is connected to the guide rail 31, and the other end of the anchor cable 33 and the external support frame 3 are both fixed by the anchor rod 32.

[0034] In this embodiment, as Figure 1 and Figure 2 As shown, the external support frame 3 is installed on the ground, and the external support frame 3 is equipped with vertical guide rails 31. The guide rails 31 are perpendicular to the ground and are made of stainless steel. The first support frame 11 and the second support frame 12 are both steel structures and are parallel to the external support frame 3. The first support frame 11 is welded and fixed to the bottom of the cabinet 1, and the second support frame 12 is welded and fixed to the top of the cabinet 1. Both the first support frame 11 and the second support frame 12 are welded with sliders that match the guide rails 31. The sliders are slidably connected to the guide rails 31, and the inner side of the sliders is also provided with wear-resistant rubber pads to reduce friction loss during sliding and ensure the stability of the cabinet 1 during sliding, preventing shaking. In this embodiment, four guide rails 31 are used, but it is not limited to four. One end of the four guide rails 31 is fixed to the external support frame 3, and the other end is connected together by connectors, and then fixed by anchor cables 33 with different tensile directions.

[0035] according to Figure 1 , Figure 2 , Figure 4 , Figure 10 As shown, anchor rods 32 for insertion into the ground are welded to the four corners of the external support frame 3. The anchor rods 32 are made of threaded steel and are 1.5-2m long. After being inserted into the ground, they are fixed by concrete pouring. Anchor cables 33 are connected to the top of the guide rails 31. The anchor cables 33 are made of steel strand and have a diameter of 8-12mm. The other end of the anchor cables 33 is fixed to the ground at a distance of 5-10m from the external support frame 3 by ground anchors. The anchor rods 32 and anchor cables 33 work together to enhance the overturning stability of the external support frame 3 under the impact of floods.

[0036] according to Figure 1 and Figure 3 As shown, the positioning pin 6 is made of No. 45 steel with a diameter of 15-20mm. It is inserted into the corresponding pin holes of the second support frame 12 and the external support frame 3. The pin hole and the positioning pin 6 are transition fit with a gap of 0.05-0.1mm. Under normal conditions, it vertically limits the cabinet 1 to prevent the cabinet 1 from sliding up and down due to vibration and other factors. The positioning pin 6 has a pre-made fracture ring groove 61. The depth of the fracture ring groove 61 is 1 / 3-1 / 2 of the diameter of the positioning pin 6, and stress concentration treatment is carried out at the ring groove. When the airbag body 43 inflates and applies an upward lifting force to the cabinet 1, the lifting force is calculated and set to be greater than the breaking strength of the positioning pin 6 at the fracture ring groove 61. The breaking force is set to 500-800N, which is sufficient to make the positioning pin 6 break precisely at the fracture ring groove 61, thereby releasing the vertical restriction on the cabinet 1 and allowing the cabinet 1 to float freely along the guide rail 31.

[0037] The buoyancy unit 4 includes a base 42, an airbag body 43, and a gas generator 44. The base 42 is mounted on the first support frame 12. The airbag body 43 is connected to the base 42 of the external support frame 3. The gas generator 44 is mounted on the base 42 and located inside the airbag body 43.

[0038] The detection unit includes a water-containing cavity, a floating component 52, a conductive ring 53, and a flow-guiding hole 55. The water-containing cavity and the flow-guiding hole 55 are both disposed in the first support frame 11. The floating component 52 is placed in the water-containing cavity. The flow-guiding hole 55 is connected to the water-containing cavity. The conductive ring 53 is mounted on the floating component 52.

[0039] The guide hole 55 is inclined, and the end of the guide hole 55 that communicates with the water-containing cavity is higher than the other end of the guide hole 55.

[0040] The device also includes a power-collecting guide rod 45 and a guide sleeve. The guide sleeve is installed on the first support frame 11 and the cabinet 1. The power-collecting guide rod 45 is installed in the guide sleeve and connected to the floating component 52.

[0041] The detection unit also includes a detection slot 51 and an electrical contact 54. The detection slot 51 is located at the bottom of the cabinet 1, and the electrical contact 54 is installed in the detection slot 51. The electrical contact 54 is aligned with the conductive ring 53.

[0042] The detection unit also includes a first water level sensor 41 with a sensing end, which is mounted on the first support frame 11. The sensing end protrudes from a preset height and is close to the external support frame 3.

[0043] In this embodiment, according to Figure 1 , Figure 5 , Figure 10 As shown, the airbag body 43 is bolted to the bottom of the first support frame 11 and the external support frame 3. The gas generator 44 is a pyrotechnic gas generator 44 with built-in gas-generating agent, which can generate sufficient gas within 3-5 seconds after being powered on.

[0044] The detection unit is divided into two parts: bottom contact detection and internal floating detection, which are used to accurately detect flood levels and generate corresponding detection signals.

[0045] according to Figure 1 , Figure 7, Figure 8 , Figure 9 As shown, bottom contact detection: The first water level sensor 41 is installed on the bottom end face of the first support frame 11 by a threaded connection. The first water level sensor 41 is a contact water level sensor, and its sensing end protrudes 5-8mm from the bottom of the first support frame 11. It is used to generate a first trigger signal when in direct contact with water.

[0046] according to Figure 7 , Figure 8 , Figure 9 As shown, internal floating detection: The second water level detection component 5 is integrated inside the first support frame 11 and the cabinet 1. The second water level detection component 5 includes a floating component 52 that can float synchronously with the water level. When the floating component 52 floats to a predetermined height, a second trigger signal is triggered. The second water level detection component 5 also includes: The detection groove 51 is located at the bottom of the cabinet 1. The detection groove 51 is a cylindrical groove with a diameter of 50-80mm and a depth of 100-150mm.

[0047] A receiving cavity is provided in the middle of the first support frame 11. The receiving cavity extends through the upper surface of the first support frame 11, so that the receiving cavity is connected to the detection groove 51.

[0048] The guide hole 55 is inclinedly opened on the side wall of the first support frame 11. The inclination angle of the guide hole 55 is 30°-45°. Its lower end is connected to the outside and its upper end is connected to the middle and upper part of the receiving cavity. The inner wall of the guide hole 55 is smooth and a filter screen is provided at the lower end opening to guide the external flood water flow slowly into the receiving cavity, while preventing rainwater from splashing in and impurities from clogging.

[0049] The floating component 52 is a lightweight floating platform disposed within the receiving cavity. The lightweight floating platform is made of closed-cell foam plastic with a density of less than 0.2 g / cm³. 3 The outer diameter of the lightweight floating platform is fitted with the inner diameter of the detection tank 51 with a clearance of 0.5-1mm. A conductive ring 53 is glued to the upper surface of the lightweight floating platform. The conductive ring 53 is a copper ring with a thickness of 2-3mm. The top inner wall of the detection tank 51 is fixed with electrical contacts 54 that are electrically connected to the control unit 23 by an insulating bracket. The electrical contacts 54 are two symmetrically arranged copper contacts with a spacing that matches the width of the conductive ring 53. When the water level in the detection tank 51 rises with the external flood, the lightweight floating platform drives the conductive ring 53 to float synchronously. When the conductive ring 53 floats up to contact the two electrical contacts 54 at the same time, a conductive circuit is formed, generating a second trigger signal and transmitting it to the control unit 23.

[0050] like Figure 5 and Figure 6As shown, the buoyancy unit 4 also includes: a base 42, which is a plastic box structure that is detachably installed at the bottom of the first support frame 11 by bolts, and a gas generator 44 is housed in the base 42.

[0051] The power-feeding rod 45 is a copper rod with an insulating sleeve. It is movably inserted into a guide sleeve at the bottom of the cabinet 1. The guide sleeve ensures that the power-feeding rod 45 can only move up and down. The lower end of the power-feeding rod 45 is electrically connected to the electrodes of the gas generator 44 via a wire, and the upper end of the power-feeding rod 45 is electrically connected to the power module 25 and control unit 23 inside the cabinet 1 via spring contacts. This allows it to provide a stable power supply to the gas generator 44 and receive control from the control unit 23. The signal can also adapt to the positional changes when the cabinet 1 is raised; the bottom of the base 42 is also provided with multiple support rods 46, which are made of rigid plastic rods, numbered 3-4 and evenly distributed, and their length is set to 5-10mm: when the airbag body 43 is not in an inflated state, the support rods 46 can be supported on the bottom crossbeam of the external support frame 3 to form a fixed gap between the cabinet 1 and the external support frame 3, so as to avoid the airbag body 43 being squeezed and damaged by the weight of the cabinet 1 itself.

[0052] The low-voltage interconnection component 2 includes a connection port 21, a switch module 22, a control unit 23, a communication module 24, and a power supply module 25, wherein: Connection port 21 is a low-voltage aviation plug, the number of which matches the number of microgrids, usually 2-4, used to connect different microgrids via low-voltage cables; control unit 23 is also connected to communication module 24 via RS485 bus communication. Control unit 23 adopts PLC controller, which acts as the control center and executes corresponding operations after making judgments based on circuit signals and water level signals; communication module 24 is a 4G / 5G dual-mode module, which can realize long-distance data transmission; power module 25 supplies power to control unit 23, low-voltage interconnect component 2, and communication module 24, and can supply power to lithium batteries or external cables.

[0053] The control unit 23, fixed inside the cabinet 1 by a mounting bracket, is part of the low-voltage interconnection component 2. The control unit 23 adopts a PLC controller and is configured to: when it receives a signal from the water level detection system that the preset warning condition has been met, immediately output a control command to the gas generator 44 to control the gas generator 44 to start gas production; the control unit 23 is configured to determine that the preset warning condition has been met and trigger the gas generator 44 only when it receives the first trigger signal and the second trigger signal simultaneously, so as to avoid device malfunction caused by a single sensor false trigger.

[0054] The control unit 23 is further configured to: simultaneously trigger the gas generator 44 and send a flood prevention start alarm signal (second alarm signal) to the remote monitoring center via the communication module 24. The second alarm signal includes the device number and the current water level data. After the cabinet 1 is raised, if the first water level sensor 41 leaves the water surface and stops triggering, and there is no signal for 30 seconds (third preset time), a safety status signal (safety signal) is sent via the communication module 24 to inform the monitoring center that the device has escaped the flood threat. If the first water level sensor 41 continues to trigger after the cabinet 1 is raised, and this continues for more than 5 minutes (second preset time), it is determined to be an emergency danger state, such as the flood level continuing to rise. The control unit 23 sends an emergency danger alarm signal (third alarm signal) via the communication module 24 on the one hand, and outputs a trip command to the switch module 22 in the low-voltage interconnection component 2 on the other hand. The switch module 22 is a low-voltage vacuum circuit breaker, which can quickly disconnect all microgrid connection circuits to achieve emergency power outage and prevent leakage accidents.

[0055] Example 2 like Figure 10 As shown, a control method for a disaster-resistant multi-microgrid low-voltage interconnection device includes the following judgment process: The low-voltage interconnection component 2 detects the circuit signal of the detection unit every first preset time to determine whether the circuit is faulty. If a fault is detected, a first alarm signal is issued. If the low-voltage interconnection component 2 receives a signal from the detection unit, it will activate the floating unit 4 and send a second alarm signal. The cabinet 1 will slide along the guide rail 31 under the action of the floating unit 4. If, after the floating unit 4 is activated, the low-voltage interconnect component 2 still receives the signal from the detection unit and continues for a second preset time, then the low-voltage interconnect component 2 sends a third alarm signal and cuts off power urgently. If the low-voltage interconnect component 2 does not receive a signal from the detection unit after the floating unit 4 is activated and this continues for a third preset time, then the low-voltage interconnect component 2 sends a safety signal.

[0056] In this embodiment, the workflow of the present invention is as follows: Device installation: Insert the anchor rod 32 of the external support frame 3 into the ground and fix it by pouring concrete. Connect the anchor cable 33 to the ground anchor to complete the fixation. Install the cabinet 1 by cooperating with the guide rail 31 of the external support frame 3 through the sliders of the first support frame 11 and the second support frame 12. Insert the positioning pin 6 to complete the vertical limit. Connect the low voltage cables of each microgrid to the low voltage interconnection component 2 through the connection port 21 to complete the electrical connection.

[0057] Normal operation: The control unit 23 collects the operating data of the low-voltage interconnection component 2 in real time and uploads it to the remote monitoring center through the communication module 24 to realize the power dispatch between microgrids; the water level detection system is in standby mode, the first water level sensor 41 has no contact water signal, there is no water accumulation in the containment cavity, the floating part 52 is at the bottom, the conductive ring 53 is separated from the electrical contact 54, and there is no trigger signal.

[0058] Early warning preparation: The control unit 23 performs a self-test every 1 minute (i.e., the first preset time, which can be set as needed) to confirm the circuit continuity of the first water level sensor 41 and the second water level detection component 5; at the same time, it checks the power supply circuit of the gas generator 44 and ensures that the flood control floating mechanism can be started at any time through the power supply rod 45; if a component failure is detected, such as the first water level sensor 41 being open-circuited, a fault alarm signal (first alarm signal) is sent through the communication module 24 to remind maintenance personnel to handle it in time.

[0059] like Figure 10 As shown, the initial flood detection is as follows: when the external flood level rises to the point of contacting the first water level sensor 41, the first water level sensor 41 generates a first trigger signal and transmits it to the control unit 23; at the same time, after the flood is filtered through the filter screen of the guide hole 55, it slowly flows into the containment cavity along the inclined channel, and the water level in the containment cavity gradually rises.

[0060] Warning condition determination: As the water level in the containment chamber 1 rises, the floating component 52 drives the conductive ring 53 to float. When the conductive ring 53 contacts the electrical contact 54, a second trigger signal is generated. The control unit 23 simultaneously receives the first trigger signal and the second trigger signal, determines that the preset warning condition has been met, sends a second alarm signal, and immediately executes flood control operation.

[0061] The control unit 23 outputs a control signal to the gas generator 44. After the gas generator 44 is powered on, it produces gas, and the airbag body 43 expands and opens the tear line of the base 42. The airbag body 43 applies an upward lifting force to the cabinet 1. When the lifting force reaches the breaking strength of the positioning pin 6, the positioning pin 6 breaks at the fracture ring groove 61, and the cabinet 1 slides upward along the guide rail 31 and floats up until the airbag body 43 is fully deployed and the cabinet 1 is removed from the flood level.

[0062] Status feedback and emergency handling: When the gas generator 44 is triggered, the control unit 23 sends a flood control start alarm signal to the monitoring center. If the flood level drops, the first water level sensor 41 will detach from the water surface and stop triggering for 30 seconds (i.e., the third preset time, which can be set as needed), and then send a safety status signal (safety signal). If the flood level continues to rise, the first water level sensor 41 will continue to trigger for 5 minutes (i.e., the second preset time, which can be set as needed), and the control unit 23 will send an emergency danger alarm signal (third alarm signal) and control the switch module 22 to disconnect all microgrid connections to achieve emergency power cut-off. After the flood recedes, maintenance personnel can replace the broken positioning pin 6 and airbag assembly 4 to restore the normal operation of the device.

[0063] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and these modifications or substitutions should all be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A disaster-resistant multi-microgrid low-voltage interconnection device, characterized in that, The system includes a cabinet (1), a first support frame (11), a second support frame (12), a low-voltage interconnection component (2), an external support frame (3), a floating unit (4), a detection unit, and a guide rail (31). The low-voltage interconnection component (2) is installed inside the cabinet (1), and the guide rail (31) is installed on the external support frame (3). The first support frame (11) and the second support frame (12) are both installed on the guide rail (31). The cabinet (1) is installed between the first support frame (11) and the second support frame (12). The floating unit (4) is installed between the first support frame (11) and the external support frame (3). The detection unit is installed in the first support frame (11) and the cabinet (1). The low-voltage interconnection component (2) is connected to the floating unit (4) and the detection unit respectively. The low-voltage interconnect component (2) is used to receive circuit signals between detection units and water level signals of detection units and to determine whether to send an alarm signal.

2. The disaster-resistant multi-microgrid low-voltage interconnection device according to claim 1, characterized in that, The buoyancy unit (4) includes a base (42), an airbag body (43) and a gas generator (44). The base (42) is mounted on the first support frame (12). The airbag body (43) is connected to the base (42) of the external support frame (3). The gas generator (44) is mounted on the base (42) and located inside the airbag body (43).

3. The disaster-resistant multi-microgrid low-voltage interconnection device according to claim 2, characterized in that, The detection unit includes a water-containing cavity, a floating component (52), a conductive ring (53), and a flow guide hole (55). The water-containing cavity and the flow guide hole (55) are both located in the first support frame (11). The floating component (52) is placed in the water-containing cavity. The flow guide hole (55) is connected to the water-containing cavity. The conductive ring (53) is mounted on the floating component (52).

4. The disaster-resistant multi-microgrid low-voltage interconnection device according to claim 3, characterized in that, The guide hole (55) is inclined, and the end of the guide hole (55) that is connected to the water-containing cavity is higher than the other end of the guide hole (55).

5. A disaster-resistant multi-microgrid low-voltage interconnection device according to claim 3, characterized in that, The device also includes a power-collecting guide rod (45) and a guide sleeve, the guide sleeve being installed on the first support frame (11) and the cabinet (1), and the power-collecting guide rod (45) being installed in the guide sleeve and connected to the floating component (52).

6. A disaster-resistant multi-microgrid low-voltage interconnection device according to claim 3, characterized in that, The detection unit also includes a detection slot (51) and an electrical contact (54). The detection slot (51) is located at the bottom of the cabinet (1), and the electrical contact (54) is installed in the detection slot (51). The electrical contact (54) is aligned with the conductive ring (53).

7. A disaster-resistant multi-microgrid low-voltage interconnection device according to claim 3, characterized in that, The detection unit also includes a first water level sensor (41) with a sensing end, the first water level sensor (41) is mounted on a first support frame (11), and the sensing end protrudes from a preset height and is close to the external support frame (3).

8. A disaster-resistant multi-microgrid low-voltage interconnection device according to claim 1, characterized in that, The second support frame (12) includes a sliding sleeve and a positioning pin (6) with a fracture ring groove (61). The sliding sleeve and the guide rail (31) are slidably connected and fixed by the positioning pin (6). The fracture ring groove (61) is located at the contact point between the slider and the guide rail (31).

9. A disaster-resistant multi-microgrid low-voltage interconnection device according to claim 1, characterized in that, The device also includes an anchor rod (32) and an anchor cable (33). One end of the anchor cable (33) is connected to the guide rail (31), and the other end of the anchor cable (33) and the external support frame (3) are both fixed by the anchor rod (32).

10. A control method for a disaster-resistant multi-microgrid low-voltage interconnection device as described in any one of claims 1-9, characterized in that, The judgment process includes: The low-voltage interconnection component (2) detects the circuit signal of the detection unit every first preset time to determine whether the circuit is faulty. If a fault is detected, a first alarm signal is issued. If the low-voltage interconnection component (2) receives a signal from the detection unit, it will activate the floating unit (4) and send a second alarm signal. The cabinet (1) will slide along the guide rail (31) under the action of the floating unit (4). If the low-voltage interconnect component (2) continues to receive the signal from the detection unit for a second preset time after the floating unit (4) is started, the low-voltage interconnect component (2) sends a third alarm signal and cuts off power in an emergency. If the low-voltage interconnect component (2) does not receive a signal from the detection unit after the floating unit (4) is activated and this continues for a third preset time, then the low-voltage interconnect component (2) sends a safety signal.

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