CN-122014344-A - Advancing type working face propulsion control method and system

CN122014344ACN 122014344 ACN122014344 ACN 122014344ACN-122014344-A

Abstract

The application belongs to the field of coal exploitation, and discloses a forward working face propulsion control method and a forward working face propulsion control system, which dynamically optimize the operation time sequence and the action parameters of each device by combining the deep perception of the operation parameters and the energy consumption characteristics of the device and the load trend prediction and the risk assessment, therefore, the overall instantaneous total power load of the working face is effectively stabilized, peak clipping and valley filling of energy consumption are realized, the overall instantaneous total power load of the working face can be effectively stabilized, the impact of a power supply system is reduced, the energy utilization efficiency is improved, and the service life of equipment is prolonged.

Inventors

LI FEI
WANG SHANSHAN
ZHANG JIALU

Assignees

济宁智能星信息技术有限公司
山东理工职业学院

Dates

Publication Date: 20260512
Application Date: 20260129

Claims (10)

1. A method for controlling the advancement of an advancing face for controlling the advancement of an automated longwall face comprising the steps of: A1. acquiring operation parameters of the coal mining machine, the scraper conveyor and the hydraulic support to identify the current production beat of the working face; A2. acquiring energy consumption characteristic parameters of the coal mining machine, the scraper conveyor and the hydraulic support under different production beats and total power safety upper limit of a working face; A3. Predicting the instantaneous power load change trend of the coal mining machine, the scraper conveyor and the hydraulic support in a future period according to the current production takt, the operation parameters, the geological condition information, the operation plan and the energy consumption characteristic parameters, and evaluating the superposition risk of the overall instantaneous total power load of the working face by combining the total power safety upper limit of the working face; A4. And adjusting operation time sequences and action parameters of the coal mining machine, the scraper conveyor and the hydraulic support according to the instantaneous power load change trend, the superposition risk and the total power safety upper limit of the working face so as to stabilize the overall instantaneous total power load of the working face.
2. The advancing face propulsion control method of claim 1, wherein the operational parameters of the shearer include cutter motor current, traction speed, and shearer position information; The operation parameters of the scraper conveyor comprise the current of a driving motor and the rotating speed of the scraper conveyor; The operation parameters of the hydraulic supports comprise the pressure and flow of a pump station, the moving state of the hydraulic supports and the propelling position of each hydraulic support; The production takt comprises a coal cutting stage, a reversing stage, a frame moving stage and a coal cleaning stage.
3. The advancing face propulsion control method according to claim 2, wherein in step A1, the step of identifying the current tact of the face includes: A101. Analyzing the instantaneous change rate of each operation parameter, the duration time of the parameter state and the relevance among the parameters to obtain the parameter combination characteristics; A102. comparing the parameter combination characteristics with the preset historical parameter modes corresponding to the production beats to obtain a preliminary identification result of the current production beats; A103. Judging the confidence coefficient of the primary identification result according to the primary identification result and by combining the fluctuation range and the abnormality degree of the parameter combination characteristics; A104. when the confidence coefficient of the preliminary identification result is not lower than a preset threshold value, taking the preliminary identification result as a final identification result of the current production beat; A105. when the confidence level of the preliminary identification result is lower than a preset threshold value, executing: According to the fluctuation range and the abnormality degree of the parameter combination characteristics, carrying out abnormal data processing on the parameter combination characteristics to obtain processed parameter combination characteristics; And comparing the processed parameter combination characteristics with the preset historical parameter modes corresponding to the production beats again to obtain a final recognition result of the current production beats.
4. A forward facing propulsion control method as claimed in claim 3, wherein step a103 comprises: acquiring a numerical value set of each characteristic parameter in the parameter combination characteristics in a preset time window; Calculating fluctuation indexes of each characteristic parameter and deviation indexes of each characteristic parameter from a history parameter mode corresponding to the preliminary identification result according to the numerical value set; and integrating the fluctuation index and the deviation index to determine the confidence coefficient of the preliminary identification result.
5. The advancing face propulsion control method according to claim 2, wherein in step A2, the step of obtaining the energy consumption characteristic parameters of the coal mining machine, the scraper conveyor and the hydraulic support at different production beats includes: A201. Acquiring instantaneous power data of the coal mining machine, the scraper conveyor and the hydraulic support in different production beats in the historical operation process, and recording the instantaneous power data as historical instantaneous power data; A202. and determining average instantaneous power of the coal mining machine, the scraper conveyor and the hydraulic support corresponding to different operation steps under different production beats according to the historical instantaneous power data, and taking the average instantaneous power as the energy consumption characteristic parameter.
6. The advancing face propulsion control method of claim 1, wherein step A3 includes: A301. Determining expected operation sequences and expected action time sequences of the coal mining machine, the scraper conveyor and the hydraulic support in a future period of time according to the current production takt, the operation parameters, the geological condition information and the operation plan; A302. Based on the expected operation sequence and the expected action sequence, the energy consumption characteristic parameters are combined, and the respective instantaneous power load change trend of the coal mining machine, the scraper conveyor and the hydraulic support in a future period of time is predicted; A303. Summarizing the respective instantaneous power load change trend of the coal mining machine, the scraper conveyor and the hydraulic support to obtain the prediction trend of the overall instantaneous total power load of the working face; A304. And comparing the predicted trend of the whole instantaneous total power load of the working face with the total power safety upper limit of the working face, and identifying a time window and amplitude exceeding the total power safety upper limit of the working face in the predicted trend so as to quantify the superposition risk of the whole instantaneous total power load of the working face.
7. The method for controlling advance of a working surface according to claim 6, wherein step a304 comprises: According to the predicted trend of the overall instantaneous total power load of the working face and the total power safety upper limit of the working face, identifying all independent overrun windows exceeding the total power safety upper limit of the working face in the predicted trend; For each identified independent overrun window, calculating a maximum instantaneous power overrun value within the independent overrun window and a cumulative power integral exceeding the upper total power safety limit for the work surface; Calculating the risk weight of each independent overrun window according to the duration time, the maximum instantaneous power overrun value and the accumulated power integral of each independent overrun window and combining with a preset evaluation criterion; And integrating the risk weights of all independent overrun windows to obtain the superposition risk index of the whole instantaneous total power load of the working face.
8. The advancing face propulsion control method of claim 1, wherein step A4 includes: A401. determining a plurality of candidate adjustment schemes according to the instantaneous power load change trend, the superposition risk and the total power safety upper limit of the working face, wherein each candidate adjustment scheme comprises the combined adjustment of operation time sequences and action parameters of a coal mining machine, a scraper conveyor and a hydraulic support; A402. for each candidate adjustment scheme, evaluating the stabilizing effect of the overall instantaneous total power load of the working face, the influence of the overall instantaneous total power load of the working face on the production efficiency and the influence of the overall instantaneous total power load on the working safety, and determining the comprehensive influence evaluation result of each candidate adjustment scheme; A403. Selecting an optimal adjustment scheme according to the comprehensive influence evaluation result; A404. and adjusting the operation time sequence and the action parameters of the coal cutter, the scraper conveyor and the hydraulic support according to the optimal adjustment scheme.
9. The advancing face propulsion control method of claim 8, wherein step a401 comprises: According to the instantaneous power load change trend, the superposition risk and the total power safety upper limit of the working face, a key time window in which power load stabilization is required is identified, and the target stabilization amplitude required to be achieved in the key time window is determined; determining a working time sequence adjustment range and an action parameter adjustment range which are respectively feasible for the coal mining machine, the scraper conveyor and the hydraulic support from preset adjustment rules based on the key time window and the corresponding target stabilizing amplitude; Generating a combination adjustment scheme of operation time sequences and action parameters of a plurality of coal mining machines, scraper conveyors and hydraulic supports according to the operation time sequence adjustment range and the action parameter adjustment range, and taking the combination adjustment scheme as the candidate adjustment scheme; And carrying out quick preliminary effect evaluation on all the candidate adjustment schemes, and eliminating schemes which cannot meet the target stabilizing amplitude or possibly cause safety risks, so as to obtain a plurality of final candidate adjustment schemes.
10. A forward face propulsion control system for controlling an automated longwall face propulsion process, the system comprising: the beat recognition module is used for acquiring the operation parameters of the coal mining machine, the scraper conveyor and the hydraulic support and recognizing the current production beat of the working face; The characteristic acquisition module is used for acquiring energy consumption characteristic parameters of the coal mining machine, the scraper conveyor and the hydraulic support under different production beats and the total power safety upper limit of the working face; The load trend prejudging module is used for predicting the instantaneous power load change trend of the coal mining machine, the scraper conveyor and the hydraulic support in a period of time in the future according to the current production takt, the operation parameters, the geological condition information, the operation plan and the energy consumption characteristic parameters, and evaluating the superposition risk of the overall instantaneous total power load of the working face by combining the total power safety upper limit of the working face; and the cooperative scheduling module is used for adjusting the operation time sequence and the action parameters of the coal mining machine, the scraper conveyor and the hydraulic support according to the instantaneous power load change trend, the superposition risk and the total power safety upper limit of the working face so as to stabilize the overall instantaneous total power load of the working face.

Description

Advancing type working face propulsion control method and system Technical Field The application relates to the field of coal exploitation, in particular to a forward working face propulsion control method and system. Background In automated longwall face coal continuous production relies on tight synergy of the shearer, scraper conveyor, and hydraulic supports. The coal mining machine is responsible for cutting coal bodies, the cut coal is transported out through the scraper conveyor, and the hydraulic support provides roof support and pushes working face equipment to push forwards. At present, in order to achieve the low-carbon and high-efficiency production goal, each core device has achieved local optimization of energy consumption at the level of itself, but in the actual long-term operation data analysis, the instantaneous total electric energy consumption of the whole working face often shows significant and large-amplitude periodic fluctuation. Such fluctuations are not entirely caused by a single device failure or a drastic change in geological conditions, but are associated with a pattern of co-action between devices. The root cause of such a peak in total energy consumption occurs is that a plurality of high-power devices have a concentration or overlap of instantaneous load peaks in the tact. For example, when a coal cutter cuts a hard coal seam or encounters gangue, the load of a cutting motor of the coal cutter can rise sharply to reach an instantaneous power peak. The drive motor of the scraper conveyor may also reach full load or even overload conditions when large amounts of coal are transported or when localized drag increases are encountered. When the hydraulic support performs concentrated frame moving action, especially when a large number of supports simultaneously or batchwise perform high energy consumption actions such as column descending, frame moving, column lifting and the like in a short time, the power requirement of the hydraulic support on the hydraulic pump station can be instantaneously and rapidly increased. Existing control systems typically control sequentially based on a preset workflow and geometric positional relationships between devices. For example, when the shearer completes a coal cutting cycle, after passing through a set of hydraulic supports, the control system may immediately issue a move command to the set or batch of supports. The scraper conveyor continuously runs during the coal cutting period of the coal mining machine and continues to transport after the frame moving is completed. Such rigid, event-triggered based control logic, the control strategy of which lacks global sensing and predictive capabilities for the overall instantaneous power load of the work surface. This results in the shearer being in a high load cutting condition during certain production periods, the scraper conveyor being fully loaded, and the hydraulic prop group being activated at exactly the same time for centralized frame transfer. In this case, the instantaneous power demands of the "three-machine" system of shearer, scraper conveyor and hydraulic support reach or approach a peak at the same time, creating a significant peak in total power demand. This multiple high power device peak load condition, at or near the same time, can cause significant impact to the face power system. First, the instantaneous high power demand may cause a drop in the supply voltage, affecting the stable operation of the electrical equipment. Second, the higher the instantaneous peak load, the greater the line loss, and typically the lower the power efficiency, during power transfer. This is because the internal resistance of cables and transformers produces heat losses proportional to the square of the current when they carry large currents, and the occurrence of peak currents can significantly increase the instantaneous losses. In addition, frequent transient high power impacts can also accelerate wear of electrical power transmission equipment, transformers, and electrical components (e.g., motors, cables, switching devices) within the work surface, shortening its useful life, increasing maintenance costs and risk of failure. At present, although part of the systems have the function of monitoring the total power of the working face in real time, the systems are mainly used for overload protection or historical data record, and are not used for actively stabilizing the load. These systems cannot dynamically adjust the job timing and action beats of each device based on a prognosis of the trend of the job load of each device over a future period of time. Thus, existing methods cannot actively, prospectively adjust the rack movement timing of the rack, or fine tune the haulage speed of the shearer or the operating speed of the scraper conveyor as necessary to stagger or smooth the load peaks of these devices. The control strategy lacking global load prejudging and cooperative scheduling capability