Substation cable trench double well cooperative drainage control method and system

Abstract

The application discloses a substation cable trench double-well cooperative drainage control method and system, relates to the technical field of substation safety monitoring, and realizes real-time collection of water level values of two adjacent water collecting wells and water flow in an auxiliary drainage pipe connected between the two adjacent water collecting wells, and respectively calculates water level change rates in the two adjacent water collecting wells according to the water level values; the water level values are used to judge waterlogging states of the two adjacent water collecting wells; when there is waterlogging and single-well drainage is normal, the water level change rates are used to determine drainage priorities of the two working wells, and water pumps in the two adjacent water collecting wells are controlled to start according to the drainage priorities; when there is waterlogging, single-well drainage is abnormal and the auxiliary drainage pipe is unblocked, a drainage scheme is determined as a cooperative drainage mode; when the auxiliary drainage pipe is blocked, the blocking degree is judged according to the water flow and a change trend of the water level change rates, and a treatment and drainage scheme is determined according to the blocking degree. Through double-well cooperation, priority scheduling and flow matching are utilized, and frequent start and stop and overload of the water pumps are avoided.

Description

Technical Field

[0001] This invention relates to the field of substation safety monitoring technology, specifically to a method and system for coordinated drainage control of dual wells in substation cable trenches. Background Technology

[0002] Substation cable trenches are important underground channels for laying power cables, and their internal environmental conditions (water accumulation, temperature, and humidity) directly affect the operational safety and lifespan of the cables. To ensure the normal operation of the cable trenches, drainage pumps, ventilation fans, and other equipment must be installed in the working shafts, along with corresponding control boxes for automatic control.

[0003] In practical engineering, to reduce construction costs and simplify wiring, a design scheme is often adopted where two adjacent working wells share a single water pump control box. However, in this "one box for two pumps" configuration, the seepage conditions of the two working wells often differ—one well may frequently accumulate water due to its lower elevation and pipe leaks, while the other well is relatively dry. If the control logic is simple and relies solely on water level thresholds for independent judgment, it will lead to frequent pump start-stops, resulting in wasted energy and equipment wear.

[0004] Therefore, there is an urgent need for an intelligent method that can achieve safe, balanced, and collaborative control in scenarios where working wells share a control box. Summary of the Invention

[0005] The purpose of this invention is to provide a method and system for coordinated drainage control of two wells in a substation cable trench. The two wells share a single control box. Through coordination between the two wells, priority scheduling and flow matching are used to avoid frequent pump start-stop and overload.

[0006] To achieve the above objectives, this application proposes the following solution: On the one hand, the present invention provides a method for coordinated drainage control of dual wells in a substation cable trench, specifically including the following steps: S1. Real-time acquisition of the first and second water level values ​​of two adjacent water collection wells in two adjacent working wells, as well as the water flow rate in the auxiliary drainage pipe connecting the two adjacent water collection wells, and calculation of the water level change rate in the two adjacent water collection wells based on the first and second water level values ​​respectively. S2. Determine the water accumulation status of two adjacent water collection wells based on the first and second water level values. S3. When there is water accumulation and single-well drainage is normal, the drainage scheme is determined to be single-well drainage: the drainage priority of the two working wells is determined according to the water level change rate, and the water pumps in the two adjacent collection wells are controlled to start according to the drainage priority. S4. When there is water accumulation and the drainage of a single well is abnormal, determine the flow status of the auxiliary drainage pipe between two adjacent water collection wells based on the trend of water flow change. When the auxiliary drainage pipe is unobstructed, the drainage scheme is determined to be a coordinated drainage mode; When the auxiliary drainage pipe is blocked, the degree of blockage is judged based on the trend of water flow and water level change rate, and the treatment and drainage plan is determined according to the degree of blockage.

[0007] In some specific implementation schemes, two adjacent water collection wells are designated as the first water collection well and the second water collection well. The specific process for determining the water accumulation status of two adjacent water collection wells is as follows: Based on the direction of water flow, the upstream and downstream relationship between the first and second water collection wells is determined. When the first water collection well is the upstream water collection well and the second water collection well is the downstream water collection well, the first water level value is collected in real time from the first water collection well and the second water level value is collected in real time from the second water collection well. When both the first water level and the second water level exceed the preset water level threshold but neither exceeds the high water level threshold, it is determined that both the first and second water collection wells have water accumulation and that the drainage of a single well is normal. When at least one of the first water level value and the second water level value exceeds the high water level threshold, it is determined that there is water accumulation and the drainage of a single well is abnormal.

[0008] In some specific implementation schemes, the process for determining the drainage priority of two adjacent working wells is as follows: When the first water level is greater than the second water level and the rate of change of the water level in the first water collection well is higher than that in the second water collection well, the water pump in the first water collection well is started. When the first water level is greater than the second water level, but the rate of change of the water level in the first collection well is lower than that in the second collection well, the pump in the second collection well is started.

[0009] In some specific implementation schemes, the process for determining the flow status of the auxiliary drainage pipe between two adjacent water collection wells is as follows: When the water flow exceeds the preset range of normal flow variation, the drainage scheme is set to collaborative drainage mode, and the auxiliary drainage pipe is activated. If the water flow rate is less than the lower limit of the normal flow rate change, and the first water level value shows a continuous upward trend while the second water level value shows a downward trend, then the auxiliary drainage pipe is determined to be blocked.

[0010] In some specific implementations, step S4 further includes the following steps: The urgency of the first and second water collection wells is determined based on the first and second water level values. When both the first and second water level values ​​exceed the high water level threshold, it is determined that both wells need to be drained urgently. When the first water level exceeds the high water level threshold but the second water level does not exceed the high water level threshold, it is determined that the first collection well needs to be drained urgently. When the second water level exceeds the high water level threshold but the first water level does not exceed the high water level threshold, it is determined that the second collection well needs to be drained urgently.

[0011] In some specific implementation schemes, when the auxiliary drainage pipe is unobstructed, the following process is performed in the coordinated drainage mode: When it is determined that both wells need emergency drainage, the water pumps in the two adjacent collection wells are started to drain at full speed. When it is determined that the first collection well needs to be drained urgently, the water pump of the first collection well is started, and the drainage rate of the water pump is adjusted according to the water flow of the auxiliary drainage pipe. When it is determined that the second water collection well needs to be drained urgently, the water pump of the second water collection well is controlled to drain at full speed.

[0012] In some specific implementation schemes, the process of adjusting the drainage rate of the water pump according to the water flow rate of the auxiliary drainage pipe is as follows: Adjust the drainage rate of the first collection well pump according to the water flow rate of the auxiliary drainage pipe and the rated drainage capacity range of the second collection well pump: If the water flow exceeds the upper limit of the pump's rated drainage capacity, the drainage volume of the first water collection well pump will be reduced through the PID algorithm (by reducing the frequency of the frequency converter or reducing the intermittent drainage duty cycle). If the water flow rate is less than the lower limit of the pump's rated drainage capacity, the first collection well pump will start in intermittent drainage mode.

[0013] In some specific implementation plans, the process of determining the degree of blockage based on the changing trends of water flow and water level change rate is as follows: Calculate the percentage decrease in flow rate and obtain the rate of change of water level in the first collection well. When the percentage decrease in flow rate is within the first range and the rate of change of water level is less than the first decrease threshold, the degree of blockage is determined to be minor blockage. When the percentage decrease in flow rate is within the second range and the rate of change in water level is between the first and second decrease thresholds, the blockage is judged to be severe. When the percentage decrease in flow rate is within the third range and the rate of change in water level exceeds the second decrease threshold, the blockage is judged to be complete.

[0014] In some specific implementation plans, the process of determining the treatment and drainage scheme based on the degree of blockage is as follows: When the blockage is minor, prompt maintenance personnel to check and clean it, and activate the collaborative drainage mode; When the blockage is severe, increase the drainage rate of the pump in the first collection well and control the pump to drain intermittently. When the blockage is complete, increase the drainage rate of the pump in the first collection well and control the pump to drain continuously.

[0015] Secondly, this application provides a dual-well coordinated drainage control system for substation cable trenches. Each working well has a collection well at its bottom, and adjacent collection wells are connected by an auxiliary drainage pipe due to an elevation difference. A flow sensor is installed at the inlet of the auxiliary drainage pipe. Each collection well is equipped with a water level sensor and a water pump. The water pumps in adjacent working wells share a single water pump control box. The water pump control box contains a built-in intelligent control unit, which is communicatively connected to the flow sensor, water level sensor, and water pump. The intelligent control unit includes: The data processing module is used to collect the first and second water level values ​​of two adjacent water collection wells in real time, as well as the water flow rate in the auxiliary drainage pipe connecting the two adjacent water collection wells, and calculate the rate of water level change in the two adjacent water collection wells based on the first and second water level values ​​respectively. The water level monitoring module for the collection wells is used to determine the water accumulation status of two adjacent collection wells based on the first water level value and the second water level value. The drainage intelligent decision-making module is used to determine the drainage plan based on the water accumulation status: when there is water accumulation and the single well drainage is normal, the drainage plan is determined to be single well drainage; When there is water accumulation and the drainage of a single well is abnormal, the flow status of the auxiliary drainage pipe between two adjacent water collection wells can be determined based on the trend of water flow change. When the auxiliary drainage pipe is unobstructed, the drainage scheme is determined to be a coordinated drainage mode; When the auxiliary drainage pipe is blocked, the degree of blockage is judged based on the trend of water flow and water level change rate, and the treatment and drainage plan is determined according to the degree of blockage. The water pump control module is used to determine the drainage priority of the two working wells based on the water level change rate when the drainage scheme is single-well drainage, and to control the water pumps in the two adjacent collection wells to start according to the drainage priority. When the drainage scheme is in the coordinated drainage mode, the pumps in the two adjacent water collection wells are controlled to perform drainage tasks according to the drainage scheme.

[0016] The inventive concept of this application is as follows: To address the technical problems of frequent pump start-stops, energy waste, and equipment wear caused by the difference in seepage between adjacent working wells in a substation cable trench sharing a single pump control box, a dual-well coordinated drainage control method is proposed. Existing technologies typically employ a single-well independent judgment and control mode, activating the corresponding pump when the water level in one well exceeds the limit. This ignores the hydraulic connection and mutual influence of drainage capacity between adjacent wells. In a shared control box scenario of "one box for two pumps," it is difficult to achieve coordinated operation of the two pumps, easily leading to frequent start-stops of one pump over a long period or simultaneous idle waste of both pumps.

[0017] To address the aforementioned issues, this invention adds an auxiliary drainage pipe equipped with a flow sensor between two adjacent collection wells, establishing a hydraulic channel between the two wells. Based on real-time data from three dimensions—water level, water level change rate, and auxiliary drainage pipe flow rate—a collaborative control architecture of "state recognition—pattern decision-making—execution control" is constructed. First, the water accumulation status is determined by the water level value and its change rate, distinguishing between "normal drainage in a single well" and "abnormal drainage in a single well," avoiding ineffective actions caused by simple threshold start / stop. Second, when drainage in a single well is normal, the water level change rate is introduced as a priority scheduling criterion, allowing the pump to prioritize serving the collection well with the faster rise in water level, achieving dynamic balance under single-pump operation. Third, when drainage in a single well is abnormal, the flow rate change trend of the auxiliary drainage pipe is used to determine the pipe's flow status. When the pipe is unobstructed, a collaborative drainage mode is activated, utilizing the upstream-to-downstream flow guiding capacity to achieve matching and adjustment between the pump source and the confluence. When the pipe is blocked, the degree of blockage is further quantified and differentiated control is applied. By treating two adjacent wells as a collaborative unit, and through hydraulic coupling and pump group coordination between the two wells, the transformation from "independent response of a single well" to "coordinated scheduling of two wells" is realized, effectively reducing the start-up and shutdown frequency and operating load of the pumps while ensuring drainage safety.

[0018] The advantages of this invention over the prior art are as follows: This application proposes a system where two wells share a single pump control box. Through drainage coordination between the two wells, the auxiliary drainage pipe is only opened when a single pump cannot operate. By coordinating the two wells, prioritizing scheduling, and matching flow rates, frequent pump starts and stops and overloads are avoided. Attached Figure Description

[0019] Figure 1 A flowchart of a substation cable trench dual-well coordinated drainage control method provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of a dual-well collaborative scenario provided in an embodiment of the present invention; Figure 3 This is a schematic diagram of a power supply network provided in an embodiment of the present invention. Detailed Implementation

[0020] 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 embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of the invention.

[0022] At the same time, it should be understood that, for ease of description, the dimensions of the various parts shown in the accompanying drawings are not drawn according to actual scale.

[0023] Furthermore, for clarity and brevity, descriptions of well-known structures, functions, and configurations may have been omitted. Those skilled in the art will recognize that various changes and modifications can be made to the examples described herein without departing from the spirit and scope of this disclosure.

[0024] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0025] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0026] Example 1 like Figure 1 As shown, this embodiment provides a method for coordinated drainage control of dual wells in a substation cable trench, specifically including the following steps: S1. Real-time acquisition of the first and second water level values ​​of two adjacent water collection wells in two adjacent working wells, as well as the water flow rate in the auxiliary drainage pipe connecting the two adjacent water collection wells, and calculation of the water level change rate in the two adjacent water collection wells based on the first and second water level values ​​respectively. S2. Determine the water accumulation status of two adjacent water collection wells based on the first and second water level values. The two adjacent water collection wells are designated as the first water collection well and the second water collection well. The specific process for determining the water accumulation status of the two adjacent water collection wells is as follows: Based on the direction of water flow, the upstream and downstream relationship between the first and second water collection wells is determined. When the first water collection well is the upstream water collection well and the second water collection well is the downstream water collection well, the first water level value is collected in real time from the first water collection well and the second water level value is collected in real time from the second water collection well. When both the first water level and the second water level exceed the preset water level threshold H_start (e.g., 0.3m) and neither exceeds the high water level threshold H_high (e.g., 0.6m), it is determined that both the first and second water collection wells have water accumulation and that drainage from a single well is normal. If at least one of the first and second water level values ​​exceeds the high water level threshold, it is determined that there is water accumulation and abnormal drainage from a single well. (This may be due to pump failure, excessive water flow, or pipe blockage.) S3. When there is water accumulation and single-well drainage is normal, the drainage scheme is determined to be single-well drainage: the drainage priority of the two working wells is determined according to the water level change rate, and the water pumps in the two adjacent collection wells are controlled to start according to the drainage priority. The specific process for determining the drainage priority of two adjacent working wells is as follows: When the first water level is greater than the second water level and the rate of change of the water level in the first collection well is higher than that in the second collection well, it indicates that the water level in the first collection well is high and rising rapidly. Therefore, the water in the first collection well should be drained first, and the water pump in the first collection well should be started. When the first water level is greater than the second water level, but the rate of change of the water level in the first collection well is lower than that in the second collection well, it indicates that the water level in the second collection well is rising faster. Therefore, the water in the second collection well is drained first, and the pump in the second collection well is activated. During single-well drainage, a single pump runs continuously until the water level drops below the preset threshold. If the relationship between the first and second water levels changes during operation, the priority determination is re-executed, and a decision is made on whether to switch.

[0027] S4. When there is water accumulation and the drainage of a single well is abnormal, determine the flow status of the auxiliary drainage pipe between two adjacent water collection wells based on the trend of water flow change. When at least one of the first water level value and the second water level value exceeds the high water level threshold, it is necessary to further distinguish the urgency of the first and second water collection wells based on the first and second water level values. When both the first and second water level values ​​exceed the high water level threshold, it is determined that both wells need to be drained urgently. When the first water level exceeds the high water level threshold but the second water level does not exceed the high water level threshold, it is determined that the first collection well needs to be drained urgently. When the second water level exceeds the high water level threshold but the first water level does not exceed the high water level threshold, it is determined that the second collection well needs to be drained urgently.

[0028] Meanwhile, to prevent blockage of the auxiliary drainage pipe during coordinated drainage, which could prevent the operation from being completed, it is also necessary to determine the flow status of the auxiliary drainage pipe between two adjacent sump pits based on the water flow trend. The specific process is as follows: When the water flow exceeds the preset range of normal flow variation, the drainage scheme is set to collaborative drainage mode, the valve of the auxiliary drainage pipe inlet is opened, and the auxiliary drainage pipe is started. When the water flow rate is less than the lower limit of the normal flow rate variation, and the first water level shows a continuous upward trend while the second water level is decreasing, it indicates that the upstream water cannot be discharged downstream, and the downstream loses its water supply, thus determining that the auxiliary drainage pipe is blocked. For example, assuming the normal flow rate is Q_normal, when the water flow rate Q_inflow > 0.2 × Q_normal, the drainage scheme is determined to be a coordinated drainage mode; when Q_inflow ≤ 0.2 × Q_normal, the degree of blockage is further determined.

[0029] 1. When the auxiliary drainage pipe is unobstructed, the drainage scheme is determined to be a coordinated drainage mode; Specifically, the execution process of the coordinated drainage mode is as follows: When it is determined that both wells need emergency drainage, the water pumps in the two adjacent collection wells are started to drain at full speed. When it is determined that the first sump needs emergency drainage, the water pump of the first sump is started, and the drainage rate of the water pump is adjusted according to the water flow rate of the auxiliary drainage pipe. The specific process is as follows: Adjust the drainage rate of the first collection well pump according to the water flow rate of the auxiliary drainage pipe and the rated drainage capacity range of the second collection well pump: If the water flow exceeds the upper limit of the pump's rated drainage capacity, the drainage volume of the first water collection well pump will be reduced through the PID algorithm (by reducing the frequency of the frequency converter or reducing the intermittent drainage duty cycle). If the water flow rate is less than the lower limit of the pump's rated drainage capacity, the first collection well pump will start in intermittent drainage mode.

[0030] When it is determined that the second collection well needs emergency drainage, the water pump of the second collection well is controlled to drain at full speed. At the same time, based on the water level of the first collection well, it is determined whether to introduce the upstream accumulated water into the second collection well through the auxiliary drainage pipe.

[0031] 2. When the auxiliary drainage pipe is blocked, the degree of blockage is determined based on the trend of water flow and water level change rate. The treatment and drainage plan is then determined according to the degree of blockage. The specific process is as follows: Calculate the percentage decrease in flow rate and obtain the rate of change in water level in the first collection well. When the percentage decrease in flow rate is within the first range and the rate of change in water level is less than the first decrease threshold, the blockage is determined to be minor. When the blockage is minor, the maintenance personnel are prompted to check and clean, maintain the original drainage mode or start the collaborative drainage mode. When the percentage decrease in flow rate is within the second range and the rate of change in water level is between the first and second decrease thresholds, the blockage is determined to be severe. When the blockage is severe, the drainage rate of the pump in the first collection well is increased and the pump is controlled to drain intermittently. When the percentage decrease in flow rate is within the third range and the rate of change in water level exceeds the second decrease threshold, the blockage is determined to be complete. When the blockage is complete, the drainage rate of the pump in the first collection well is increased and the pump is controlled to drain continuously.

[0032] It is understandable that, such as Figure 2 As shown, the application scenario of the dual-well coordinated drainage control method in this embodiment can be: Assume two adjacent working manholes are designated as Working Manhole 1 and Working Manhole 2, arranged sequentially along the longitudinal drainage direction of the cable trench. Working Manhole 1 is located upstream (higher elevation), and Working Manhole 2 is located downstream (lower elevation). The elevation difference ΔH between the two manholes is determined by the longitudinal drainage slope θ of the cable trench and the distance between the manholes L: ΔH = L × tanθ. Each working manhole has a collection well at its bottom, with a depth of not less than 0.3m and a slope of not less than 0.3% from the bottom of the pit towards the water pump suction inlet. A removable steel grate is installed on top of the collection well to intercept debris.

[0033] The water pump in each working well is located at the bottom of the sump with its suction inlet facing downwards, ensuring the pump's suction inlet is submerged for effective drainage. A first water level sensor and a second water level sensor are installed on the walls of the first and second sumps to collect the first water level value H1 and the second water level value H2 in real time, and to calculate the water level change rates v1 and v2. The water level sensors can be submersible level transmitters or ultrasonic level sensors. The first and second sumps are connected by an auxiliary drainage pipe. The inlet of the auxiliary drainage pipe is located in the higher first sump, and the outlet is located in the second sump. The inlet is equipped with a stainless steel filter and a controllable valve. When drainage to the second sump is needed, the valve is activated to open, connecting the first and second sumps. A flow sensor is installed at the inlet of the auxiliary drainage pipe.

[0034] The power supply and distribution of electrical equipment in the first and second working shafts are guaranteed by dual power supply circuits, such as... Figure 3As shown, each working shaft is equipped with a power and lighting supply box, a lighting distribution box, and a fan control box. The power and lighting supply boxes in adjacent working shafts are connected to the substation's incoming lines 1T1 and 1T2, respectively, providing a main power supply to the electrical equipment in each working shaft. Branch lines then extend from the power and lighting supply boxes to connect to the lighting distribution box, fan control box, water pump control box, and maintenance socket box, etc. The fan control box supplies power to the ventilation fans in its corresponding working shaft. The water pump control box is shared by adjacent working shafts, providing power to and controlling the water pumps in the first and second water collection shafts for drainage. In non-emergency situations, single-pump operation is prioritized to avoid energy waste and equipment wear caused by simultaneous operation of two pumps. In emergencies, simultaneous operation of two pumps is permitted to quickly lower the water level and ensure cable safety. Each working well is also equipped with a gas sensor to monitor the concentrations of CH4, H2S, and O2. Before drainage, the gas concentration in the working well is monitored in real time to determine whether to drain. If CH4 ≥ 0.5%, H2S ≥ 6.6 ppm, or O2 < 19.5%, a gas exceeding the standard alarm is triggered, prohibiting the start of any water pumps. The ventilation fan is automatically started, and after the gas concentration returns to normal, the lockout is automatically released, and drainage control is restored.

[0035] Since the two well pumps share a single pump control box, and the sump pits within the two wells are interconnected, controlling the pumps in adjacent working wells requires a comprehensive assessment of the drainage logic based on the environmental conditions within both wells. Specifically: The system collects the water level values ​​H1 of the first collection well, H2 of the second collection well, and the water flow rate Q_inflow of the auxiliary drainage pipe in real time, and calculates the water level change rates v1 and v2.

[0036] The water level determines the water accumulation status. When water accumulation exists and is in a normal state, a single-well drainage mode is used. Drainage priority is determined based on water level and water level change rate, controlling the operation of a single pump. The single-well mode operation strategy is as follows: a single pump runs continuously until the water level drops to H_stop; if the water level in another well exceeds H_start during operation, priority determination is re-executed to decide whether to switch. When water accumulation exists and is in an emergency state (at least one water level ≥ H_high), a coordinated drainage mode is used. The corresponding coordinated drainage scheme is executed based on the water level status of both wells and the status of the auxiliary drainage pipe. The status of the auxiliary drainage pipe is determined using flow sensor data. If Q_inflow > 0.2 × Q_normal (normal flow rate), then the auxiliary drainage pipe is unobstructed; If Q_inflow ≤ 0.2×Q_normal (normal flow rate) and H1 continues to rise while H2 falls, then the auxiliary drainage pipe is blocked. When both wells are in an emergency and the auxiliary drainage pipe is unobstructed, execute simultaneous drainage using both pumps: Start two water pumps simultaneously: issue start instructions to both water pumps at the same time, and the two water pumps start running concurrently; Downstream pump operation strategy: continuous full-speed operation to reduce the downstream water level with full effort; when H2 < H_start, stop the downstream pump; Upstream pump operation strategy: If H2 > 0.8×H_high: the upstream pump runs at full speed; If H2 drops to (0.5~0.8)×H_high: the upstream pump switches to the flow matching regulation mode; If H2 < 0.5×H_high: the upstream pump switches to the intermittent drainage mode; Delay for 30 seconds, and if H1 < H_start, stop the upstream pump When both wells are in emergency and the auxiliary drainage pipe is blocked, perform independent forced drainage of the two pumps: Start two water pumps simultaneously: the two water pumps start continuous full-speed operation at the same time; Independent drainage respectively: Upstream pump: discharge the accumulated water in the upstream collecting well directly through the temporary drainage outlet; when H1 < H_start, stop the upstream pump; Downstream pump: discharge the accumulated water in the downstream collecting well through the normal drainage pipeline; when H2 < H_start, stop the downstream pump; When the upstream pump is running, adjust the drainage rate of the upstream water pump according to the auxiliary drainage pipe flow Q_inflow and the rated drainage capacity of the downstream water pump Q_pump2_max: If Q_inflow > 0.9×Q_pump2_max, reduce the displacement of the upstream water pump through the PID algorithm; If Q_inflow < 0.3×Q_pump2_max, start the intermittent drainage mode; PID regulation target: Q_inflow = (0.8~0.9)×Q_pump2_max; When it is determined that the auxiliary drainage pipe is blocked, judge the blockage degree according to the flow drop percentage and the water level change rate, and execute corresponding treatment: When the flow drop percentage is in [30%, 50%) and the water level change rate v1 < 0.01m / min, the blockage degree is judged as slight blockage, maintenance is prompted and the intermittent drainage strategy is adopted; When the flow drop percentage is in [50%, 80%) and the water level change rate v1 is in [0.01, 0.03)m / min, the blockage degree is judged as severe blockage, emergency treatment is required and the enhanced intermittent drainage strategy is adopted; When the flow drop percentage ≥ 80% and the water level change rate v1 ≥ 0.03m / min, the blockage degree is judged as complete blockage, emergency repair is required and continuous full-speed drainage is adopted; Blockage recovery detection: When Q_inflow recovers to >0.5×Q_normal and lasts for more than 5 minutes, the blockage is determined to be cleared and the alarm is lifted.

[0037] Example 2 Secondly, this application provides a dual-well coordinated drainage control system for substation cable trenches. Each working well has a collection well at its bottom, and adjacent collection wells are connected by an auxiliary drainage pipe due to an elevation difference. A flow sensor is installed at the inlet of the auxiliary drainage pipe. Each collection well is equipped with a water level sensor and a water pump. The water pumps in adjacent working wells share a single water pump control box. The water pump control box contains a built-in intelligent control unit, which is communicatively connected to the flow sensor, water level sensor, and water pump. The intelligent control unit includes: The data processing module is used to collect the first and second water level values ​​of two adjacent water collection wells in real time, as well as the water flow rate in the auxiliary drainage pipe connecting the two adjacent water collection wells, and calculate the rate of water level change in the two adjacent water collection wells based on the first and second water level values ​​respectively. The water level monitoring module for the collection wells is used to determine the water accumulation status of two adjacent collection wells based on the first water level value and the second water level value. The drainage intelligent decision-making module is used to determine the drainage plan based on the water accumulation status: when there is water accumulation and the single well drainage is normal, the drainage plan is determined to be single well drainage; When there is water accumulation and the drainage of a single well is abnormal, the flow status of the auxiliary drainage pipe between two adjacent water collection wells can be determined based on the trend of water flow change. When the auxiliary drainage pipe is unobstructed, the drainage scheme is determined to be a coordinated drainage mode; When the auxiliary drainage pipe is blocked, the degree of blockage is judged based on the trend of water flow and water level change rate, and the treatment and drainage plan is determined according to the degree of blockage. The water pump control module is used to determine the drainage priority of the two working wells based on the water level change rate when the drainage scheme is single-well drainage, and to control the water pumps in the two adjacent collection wells to start according to the drainage priority. When the drainage scheme is in the coordinated drainage mode, the pumps in the two adjacent water collection wells are controlled to perform drainage tasks according to the drainage scheme.

[0038] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Based on the technical essence of the present invention, any simple modifications, equivalent substitutions, and improvements made to the above embodiments within the spirit and principles of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A method for coordinated drainage control of dual wells in a substation cable trench, characterized in that, Specifically, the following steps are included: S1. Real-time acquisition of the first and second water level values ​​of two adjacent water collection wells in two adjacent working wells, as well as the water flow rate in the auxiliary drainage pipe connecting the two adjacent water collection wells, and calculation of the water level change rate in the two adjacent water collection wells based on the first and second water level values ​​respectively; the two adjacent water collection wells are the first water collection well and the second water collection well. Based on the water flow direction, the upstream and downstream relationship of the first water collection well and the second water collection well is determined, with the first water collection well being the upstream water collection well and the second water collection well being the downstream water collection well; S2. Determine the water accumulation status of two adjacent water collection wells based on the first and second water level values. S3. When there is water accumulation and single-well drainage is normal, the drainage scheme is determined to be single-well drainage: the drainage priority of the two working wells is determined according to the water level change rate, and the water pumps in the two adjacent collection wells are controlled to start according to the drainage priority. S4. When there is water accumulation and the drainage of a single well is abnormal, determine the flow status of the auxiliary drainage pipe between two adjacent water collection wells based on the trend of water flow change. When the auxiliary drainage pipe is unobstructed, the drainage scheme is determined to be in collaborative drainage mode. In collaborative drainage mode, the following process is executed: When it is determined that both wells need emergency drainage, the water pumps in the two adjacent collection wells are started to drain at full speed. When it is determined that the first sump needs emergency drainage, the water pump of the first sump is started, and the drainage rate of the water pump is adjusted according to the water flow rate of the auxiliary drainage pipe. The specific process is as follows: Adjust the drainage rate of the first collection well pump according to the water flow rate of the auxiliary drainage pipe and the rated drainage capacity range of the second collection well pump: If the water flow exceeds the upper limit of the pump's rated drainage capacity, the drainage volume of the first water collection well pump will be adjusted using a PID algorithm. PID control target: Q_inflow = (0.8~0.9)×Q_pump2_max; Where Q_inflow represents the water flow rate of the auxiliary drainage pipe, and Q_pump2_max represents the rated drainage capacity of the water pump; If the water flow rate is less than the lower limit of the pump's rated drainage capacity, the first collection well pump will start in intermittent drainage mode. When it is determined that the second water collection well needs to be drained urgently, the water pump of the second water collection well is controlled to drain at full speed. When the auxiliary drainage pipe is blocked, the degree of blockage is determined based on the changing trends of water flow and water level change rate. A treatment and drainage plan is then determined based on the degree of blockage. The specific process is as follows: When the blockage is minor, prompt maintenance personnel to check and clean it, and activate the collaborative drainage mode; When the blockage is severe, increase the drainage rate of the pump in the first collection well and control the pump to drain intermittently. When the blockage is complete, increase the drainage rate of the pump in the first collection well and control the pump to drain continuously.

2. The substation cable trench dual-well coordinated drainage control method according to claim 1, characterized in that, The specific process for determining the water accumulation status of two adjacent sump pits is as follows: The first water level value is collected in real time from the first collection well, and the second water level value is collected in real time from the second collection well. When both the first water level and the second water level exceed the preset water level threshold but neither exceeds the high water level threshold, it is determined that both the first and second water collection wells have water accumulation and that the drainage of a single well is normal. When at least one of the first water level value and the second water level value exceeds the high water level threshold, it is determined that there is water accumulation and the drainage of a single well is abnormal.

3. The substation cable trench dual-well coordinated drainage control method according to claim 2, characterized in that, The specific process for determining the drainage priority of two adjacent working wells is as follows: When the first water level is greater than the second water level and the rate of change of the water level in the first water collection well is higher than that in the second water collection well, the water pump in the first water collection well is started. When the first water level is greater than the second water level, but the rate of change of the water level in the first collection well is lower than that in the second collection well, the pump in the second collection well is started.

4. The substation cable trench dual-well coordinated drainage control method according to claim 2, characterized in that, The specific process for determining the flow status of the auxiliary drainage pipe between two adjacent water collection wells is as follows: When the water flow exceeds the preset range of normal flow variation, the auxiliary drainage pipe is unobstructed, and the drainage scheme is determined to be a coordinated drainage mode. If the water flow rate is less than the lower limit of the normal flow rate change, and the first water level value shows a continuous upward trend while the second water level value shows a downward trend, then the auxiliary drainage pipe is determined to be blocked.

5. The substation cable trench dual-well coordinated drainage control method according to claim 4, characterized in that, Step S4 also includes the following steps: The urgency of the first and second water collection wells is determined based on the first and second water level values. When both the first and second water level values ​​exceed the high water level threshold, it is determined that both wells need to be drained urgently. When the first water level exceeds the high water level threshold but the second water level does not exceed the high water level threshold, it is determined that the first collection well needs to be drained urgently. When the second water level exceeds the high water level threshold but the first water level does not exceed the high water level threshold, it is determined that the second collection well needs to be drained urgently.

6. The substation cable trench dual-well coordinated drainage control method according to claim 5, characterized in that, The specific process for determining the degree of blockage based on the changing trends of water flow and water level is as follows: Calculate the percentage decrease in flow rate and obtain the rate of change of water level in the first collection well. When the percentage decrease in flow rate is within the first range and the rate of change of water level is less than the first decrease threshold, the degree of blockage is determined to be minor blockage. When the percentage decrease in flow rate is within the second range and the rate of change in water level is between the first and second decrease thresholds, the blockage is judged to be severe. When the percentage decrease in flow rate is within the third range and the rate of change in water level exceeds the second decrease threshold, the blockage is judged to be complete.

7. A dual-well coordinated drainage control system for cable trenches in substations, characterized in that, Each working well has a water collection well at its bottom. Adjacent water collection wells have an elevation difference and are connected by an auxiliary drainage pipe. A flow sensor is installed at the inlet of the auxiliary drainage pipe. Each water collection well is equipped with a water level sensor and a water pump. The water pumps in adjacent working wells share a single water pump control box. The water pump control box contains an intelligent control unit, which is communicatively connected to the flow sensor, water level sensor, and water pump. The intelligent control unit is used to implement the substation cable trench dual-well coordinated drainage control method as described in claim 1, including: The data processing module is used to collect the first and second water level values ​​of two adjacent water collection wells in real time, as well as the water flow rate in the auxiliary drainage pipe connecting the two adjacent water collection wells, and to calculate the rate of water level change in the two adjacent water collection wells based on the first and second water level values. The water level monitoring module for the collection wells is used to determine the water accumulation status of two adjacent collection wells based on the first water level value and the second water level value. The drainage intelligent decision-making module is used to determine the drainage plan based on the water accumulation status: when there is water accumulation and the single well drainage is normal, the drainage plan is determined to be single well drainage; When there is water accumulation and the drainage of a single well is abnormal, the flow status of the auxiliary drainage pipe between two adjacent water collection wells can be determined based on the trend of water flow change. When the auxiliary drainage pipe is unobstructed, the drainage scheme is determined to be a coordinated drainage mode; When the auxiliary drainage pipe is blocked, the degree of blockage is judged based on the trend of water flow and water level change rate, and the treatment and drainage plan is determined according to the degree of blockage. The water pump control module is used to determine the drainage priority of the two working wells based on the water level change rate when the drainage scheme is single-well drainage, and to control the water pumps in the two adjacent collection wells to start according to the drainage priority. When the drainage scheme is in the coordinated drainage mode, the pumps in the two adjacent water collection wells are controlled to perform drainage tasks according to the drainage scheme.

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