An automatic control system for power supply in a coal mine

Abstract

The present application belongs to the technical field of automatic control system, and particularly relates to a coal mine underground power supply automatic control system, comprising: a ground main station monitoring module, a communication network module, an underground monitoring substation module, an intelligent control module, a state monitoring module, a permission handover verification module, a redundant sensor network module, a double-channel control instruction verification module and an emergency intervention module; the control right switching decision unit determines the results of multi-dimensional data of the state monitoring module, and when the environmental parameters, the equipment health degree and the power supply quality simultaneously exceed the safety threshold, triggers the control right transfer procedure and completes the permission transfer through the permission handover verification module. The double-channel control instruction verification realizes the physical isolation of automatic and manual control, and completely eliminates the instruction conflict risk; the permission handover verification module adopts the dual authentication of biological characteristics and dynamic password, and ensures the safety of the control right transfer.

Description

Technical Field

[0001] This invention belongs to the field of automatic control system technology, specifically relating to an automatic control system for underground power supply in coal mines. Background Technology

[0002] As a core guarantee for safe production in coal mines, underground power supply systems typically employ a combination of manual operation and fixed-program control in traditional control systems. Existing automated control systems often rely on single-parameter threshold judgments for equipment start-up and shutdown control, leading to problems such as isolated sensor data analysis and limited control mode switching conditions in critical areas like gas concentration monitoring and equipment insulation performance testing. Most systems use simple automatic / manual switching buttons to transfer control, lacking a multi-dimensional comprehensive judgment mechanism for abnormal states, which easily results in erroneous switching or switching delays.

[0003] Meanwhile, the existing control handover process lacks strict identity verification and operational traceability mechanisms, and the manual control channel and automatic control loop are not physically isolated, posing a risk of command conflicts. In terms of emergency response, conventional systems rely on a single emergency stop loop, which is susceptible to interference in the complex electromagnetic environment downhole, leading to malfunctions or failures. These shortcomings make it difficult for existing systems to balance the contradiction between the efficiency of automated control and the reliability of manual intervention, potentially delaying emergency response in the event of sudden abnormal conditions. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention provides an automatic control system for underground power supply in coal mines. This control system aims to solve the technical problems of single judgment conditions, unreliable authority handover, and untimely emergency response in the switching process between automatic control and manual intervention in underground power supply systems in coal mines.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0006] An automatic power supply control system for underground coal mines, comprising:

[0007] The ground master station monitoring module is used to monitor the status of the power supply system and issue control commands;

[0008] The communication network module constructs redundant communication links between the surface and underground.

[0009] The underground monitoring substation module collects operating parameters of the power supply equipment;

[0010] The intelligent control module includes an automatic control unit, a manual control unit, and a control switching decision unit;

[0011] The status monitoring module integrates environmental parameters, equipment health status, and power supply quality monitoring functions;

[0012] The permission handover verification module enables identity verification and permission locking during the transfer of control.

[0013] Redundant sensor network modules are used to deploy multi-source heterogeneous sensor groups and verify data consistency.

[0014] Dual-channel control command verification module, separating automatic control and manual control command transmission channels;

[0015] The control status indicator module displays the current control ownership status and handover process prompts.

[0016] The emergency intervention module is equipped with both hard-wired and wireless dual-backup emergency control channels;

[0017] The control handover decision unit determines the control handover process based on the multi-dimensional data from the status monitoring module. When environmental parameters, equipment health, and power supply quality all exceed the safety threshold simultaneously, the control handover decision unit triggers the control handover process and completes the transfer of permissions through the permission handover verification module.

[0018] The status monitoring module includes:

[0019] The environmental parameter monitoring submodule collects real-time data on gas concentration, temperature, humidity, and ventilation volume.

[0020] The equipment health assessment submodule analyzes insulation resistance values, contactor actuation frequency, and load fluctuation characteristics.

[0021] The power quality analysis submodule monitors voltage harmonic distortion rate, three-phase imbalance, and transient overvoltage events.

[0022] The equipment health assessment submodule includes:

[0023] Insulation performance monitoring unit, which measures the insulation resistance value of the equipment to ground in real time;

[0024] Mechanical wear assessment unit: counts the number of contactor opening and closing cycles and predicts remaining lifespan;

[0025] The load fluctuation analysis unit identifies abnormal load changes by analyzing current waveform characteristics.

[0026] The redundant sensor network module includes:

[0027] Three sets of environmental sensors detect methane concentration using infrared absorption, laser scattering, and electrochemical principles, respectively.

[0028] A dual-redundant equipment status sensor group, including a cross-validated combination of vibration sensors and temperature sensors;

[0029] The data consistency verification unit triggers automatic calibration when the data deviation of the same type of sensor exceeds 5%.

[0030] The permission handover verification module includes:

[0031] The biometric identification unit verifies the operator's identity via fingerprint or iris scan.

[0032] The dynamic password verification unit generates a one-time operation password synchronized with the ground master station clock;

[0033] The access control unit provides electrical isolation to the automatic control loop after the transfer of control.

[0034] The dual-channel control command verification module includes:

[0035] The automatic control channel uses the industrial Ethernet protocol to transmit digital control commands.

[0036] The manual control channel transmits operation commands via a hard-wired relay circuit.

[0037] The channel isolation unit uses optocouplers to achieve electrical isolation.

[0038] The command conflict arbitration unit prioritizes executing commands from the manual control channel.

[0039] The control status indication module includes:

[0040] A distributed LED light strip indicator device is arranged along the power supply line and displays red / yellow / green status;

[0041] The HMI interface features a 3D topology diagram that dynamically displays the ownership of control over each area.

[0042] The voice guidance unit provides operation prompts during the permission transfer process.

[0043] The emergency intervention module includes:

[0044] The hard-wired emergency stop circuit uses a series circuit of normally closed contacts with independent power supply.

[0045] The wireless emergency channel uses frequency hopping spread spectrum technology to transmit emergency stop commands.

[0046] Priority management unit, setting up a priority response mechanism for hard-wired loops;

[0047] The dual-trigger verification unit requires receiving two independent signals simultaneously to perform a power-off operation.

[0048] The intelligent control module also includes:

[0049] The control mode self-test unit periodically checks the integrity of the automatic and manual control channels;

[0050] Switch the testing unit to simulate the control transfer process under abnormal conditions;

[0051] The fault injection detection unit verifies the emergency response capability of the authorization handover verification module.

[0052] It also includes a control transfer record unit, which records in detail the transfer trigger time, abnormal parameters, operator identity, equipment status change data and reset operation log, forming a complete and traceable operation chain.

[0053] Compared with the prior art, the beneficial effects of this invention are:

[0054] This invention significantly improves the accuracy of abnormal state identification by comprehensively evaluating environmental, equipment, and power supply quality parameters through a multi-dimensional status monitoring module. A redundant sensor network and data verification mechanism effectively prevent malfunctions caused by false alarms from a single sensor.

[0055] Dual-channel control command verification achieves physical isolation between automatic and manual control, completely eliminating the risk of command conflicts; the authorization handover verification module uses both biometric and dynamic password authentication to ensure the security of control transfer.

[0056] The hard-wired and wireless dual backup design of the emergency intervention module significantly improves the reliability of emergency stop operations; the control transfer recording unit completely saves the operation process data, providing a reliable basis for accident tracing. Attached Figure Description

[0057] Figure 1 This is a connection block diagram of the present invention. Detailed Implementation

[0058] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0059] like Figure 1 As shown, the core of this underground power supply automatic control system in coal mines lies in constructing a multi-level automatic control switching mechanism. This mechanism achieves a safe connection between intelligent control and manual intervention through a combination of hardware redundancy and logic verification. During system implementation, a main monitoring platform is first deployed at the ground dispatch center. This platform is equipped with a large display screen and operating terminals, capable of displaying the three-dimensional topology of the underground power supply network, equipment operating parameters, and environmental monitoring data in real time. Multifunctional monitoring substations are installed at key underground power supply nodes. Each substation integrates environmental sensors, electrical parameter acquisition units, and command execution mechanisms, establishing a bidirectional data channel with the ground master station through a dual-ring network communication architecture.

[0060] The system's intelligent control module adopts a dual-processor architecture. The main processor executes a preset automatic control program, while the backup processor is dedicated to identifying abnormal situations. When the downhole environmental sensors detect abnormal gas concentration, excessive temperature, or insufficient ventilation, the equipment health assessment unit simultaneously analyzes indicators such as the insulation performance and mechanical wear of the power supply equipment, while the power quality analysis unit monitors voltage fluctuations and harmonic distortion. After comprehensive judgment of these three types of data, if they simultaneously exceed the safety threshold, the control handover decision unit immediately initiates the authorization transfer process. At this time, the ground control station issues an audible and visual warning, and the operator must take over control through dual verification of fingerprint recognition and dynamic password. After successful verification, the system automatically disconnects the automatic control loop and activates the manual operation interface.

[0061] To ensure reliable control handover, the system employs a triple-layer protection mechanism: The first layer is a redundant sensor network, deploying three sets of sensors with different operating principles in critical areas for cross-verification. When data deviation exceeds a preset threshold, a verification process is automatically triggered. The second layer is dual-channel control command verification: automatic control signals are transmitted via a digital communication network, while manual control commands are transmitted via an independent hardwired circuit. These two systems are physically isolated and have a conflict detection priority mechanism. The third layer is an emergency intervention system, equipped with a hardwired emergency stop button and a wireless remote control device for dual backup. An emergency stop command requires simultaneous receipt of two independent signals to execute the power-off operation. All control handover processes are fully recorded, including trigger reasons, operator information, and equipment status changes, forming a traceable operation log.

[0062] When the system is in automatic control mode, the power supply equipment in the underground central substation performs opening and closing operations according to a predetermined program. During a certain equipment inspection, environmental sensors detected a continuous increase in methane concentration in a certain area, and at the same time, the insulation resistance value of the high-voltage switchgear in that area showed abnormal fluctuations. Power quality analysis showed that the voltage harmonic content of this circuit exceeded the standard. After considering these three abnormal indicators, the control handover decision unit immediately sent a control transfer request to the ground master station.

[0063] Upon receiving the request, the ground operator first completes fingerprint verification on the control console, then obtains a system-generated dynamic verification code for secondary confirmation. During the handover of authority, the automatic control circuits of the relevant equipment downhole are electrically isolated, and the equipment operation authority is switched to manual control mode. Simultaneously, the LED indicator bar of the power supply line in that area flashes red. After the operator remotely disconnects the faulty circuit and starts the backup power supply line through the manual control interface, the system automatically records the key time points and equipment status data of the entire handover process, generating a complete emergency response report.

[0064] The system employs a combination of biometric identification and dynamic passwords. The control panel is equipped with a fingerprint reader and a dynamic password display. The verification information is synchronized in real time with the ground master station database, ensuring that only authorized personnel can take over control of the system in an emergency.

[0065] Three sets of environmental sensors are deployed at key locations such as roadway intersections and areas with dense equipment. They employ infrared, laser, and electrochemical detection principles, respectively. The data comparison module continuously monitors the consistency of data from each set to eliminate the risk of false alarms from a single sensor.

[0066] The automatic control channel uses industrial Ethernet to transmit digital commands, while the manual control channel uses a relay hard-wired circuit. An opto-isolation barrier is set between the two channels to ensure that manual commands have absolute priority in the event of automatic control failure.

[0067] Emergency stop button boxes are installed at intervals in the underground roadways. Each button box includes two emergency stop switches connected in series and is equipped with a wireless remote control transmitter. An emergency stop command must trigger two independent signal sources simultaneously (such as wired + wireless) to take effect, preventing accidental power outages due to misoperation.

[0068] An LED light strip is installed along the power cable route. It displays green during normal operation, flashes yellow during control handover, and turns solid red after an emergency power outage. The ground monitoring interface synchronously displays a 3D dynamic diagram, using different colors to distinguish the control status of each area.

[0069] This invention, through hardware architecture design and management process innovation, establishes a reliable manual intervention channel while ensuring the system's automation level, meeting the special requirements of the complex underground coal mine environment for the safety and reliability of the power supply control system.

[0070] The above description only illustrates preferred embodiments of the present invention, but the present invention is not limited to the above embodiments.

Claims

1. An automatic power supply control system for underground coal mines, characterized in that, include: The ground master station monitoring module is used to monitor the status of the power supply system and issue control commands; The communication network module constructs redundant communication links between the surface and underground. The underground monitoring substation module collects operating parameters of the power supply equipment; The intelligent control module includes an automatic control unit, a manual control unit, and a control switching decision unit; The status monitoring module integrates environmental parameters, equipment health status, and power supply quality monitoring functions; The permission handover verification module enables identity verification and permission locking during the transfer of control. Redundant sensor network modules are used to deploy multi-source heterogeneous sensor groups and verify data consistency. Dual-channel control command verification module, separating automatic control and manual control command transmission channels; The control status indicator module displays the current control ownership status and handover process prompts. The emergency intervention module is equipped with both hard-wired and wireless dual-backup emergency control channels; The control handover decision unit determines the control handover process based on the multi-dimensional data judgment results of the status monitoring module. When environmental parameters, equipment health and power supply quality all exceed the safety threshold at the same time, the control handover decision unit triggers the control handover process and completes the permission transfer through the permission handover verification module. The status monitoring module includes: an environmental parameter monitoring submodule, which collects real-time data on gas concentration, temperature, humidity and ventilation volume; an equipment health assessment submodule, which analyzes insulation resistance value, contactor operation frequency and load fluctuation characteristics; and a power supply quality analysis submodule, which monitors voltage harmonic distortion rate, three-phase imbalance and transient overvoltage events. The equipment health assessment submodule includes: an insulation performance monitoring unit, which measures the equipment's insulation resistance to ground in real time; a mechanical wear assessment unit, which counts the number of contactor opening and closing cycles and predicts the remaining lifespan; and a load fluctuation analysis unit, which identifies abnormal load changes through current waveform characteristics. The authorization handover verification module includes: a biometric identification unit that verifies the operator's identity via fingerprint or iris scan; a dynamic password verification unit that generates a one-time operation password synchronized with the ground master station clock; and an authorization locking unit that provides electrical isolation to the automatic control loop after the transfer of control. The dual-channel control command verification module includes: an automatic control channel that transmits digital control commands using the industrial Ethernet protocol; a manual control channel that transmits operation commands through a hard-wired relay circuit; a channel isolation unit that uses optocouplers to achieve electrical isolation; and a command conflict arbitration unit that prioritizes the execution of commands from the manual control channel. The emergency intervention module includes: a hard-wired emergency stop circuit, which uses a normally closed contact series circuit with independent power supply; a wireless emergency channel, which uses frequency hopping spread spectrum technology to transmit emergency stop commands; a priority management unit, which sets a priority response mechanism for the hard-wired circuit; and a dual-trigger verification unit, which can only execute power cut-off after receiving two independent signals simultaneously.

2. The automatic control system for power supply in a coal mine according to claim 1, characterized in that, The redundant sensor network module includes: Three sets of environmental sensors detect methane concentration using infrared absorption, laser scattering, and electrochemical principles, respectively. A dual-redundant equipment status sensor group, including a cross-validated combination of vibration sensors and temperature sensors; The data consistency verification unit triggers automatic calibration when the data deviation of the same type of sensor exceeds 5%.

3. The automatic control system for power supply in underground coal mine according to claim 1, characterized in that, The control status indication module includes: A distributed LED light strip indicator device is arranged along the power supply line and displays red / yellow / green status; The HMI interface features a 3D topology map that dynamically displays the ownership of control over each area. The voice guidance unit provides operation prompts during the permission transfer process.

4. The automatic control system for power supply in underground coal mine according to claim 1, characterized in that, The intelligent control module also includes: The control mode self-test unit periodically checks the integrity of the automatic and manual control channels; Switch the testing unit to simulate the control transfer process under abnormal conditions; The fault injection detection unit verifies the emergency response capability of the authorization handover verification module.

5. The automatic control system for power supply in underground coal mine according to claim 1, characterized in that, Also includes: The control transfer record unit records in detail the transfer trigger time, abnormal parameters, operator identity, equipment status change data, and reset operation log, forming a complete and traceable operation chain.

Images