Automatic control system for underground coal mine power supply

Abstract

The invention belongs to the technical field of automatic control systems, and particularly relates to an underground coal mine power supply automatic control system. Comprising a ground master 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 dual-channel control instruction verification module and an emergency intervention module. And the control right switching decision-making unit triggers a control right transfer process and completes right transfer through the right transfer verification module according to a multi-dimensional data judgment result of the state monitoring module when the environmental parameters, the equipment health degree and the power supply quality exceed safety thresholds at the same time. Physical isolation of automatic control and manual control is achieved through double-channel control instruction verification, and the instruction conflict risk is thoroughly eliminated; and the authority handover verification module adopts dual authentication of biological characteristics and dynamic passwords, so that the security of control authority transfer is ensured.

Description

Technical Field

[0001] The invention belongs to the technical field of automatic control systems, and in particular relates to an automatic power supply control system for underground coal mines. Background Art

[0002] Underground coal mine power supply systems are a core guarantee for safe production. Traditional control systems generally rely on a combination of manual oversight and fixed program control. Existing automated control systems often rely on single parameter thresholds to control equipment start and stop. This leads to issues such as isolated sensor data analysis and limited control mode switching conditions in key areas like gas concentration monitoring and equipment insulation performance testing. Most systems utilize a simple automatic / manual toggle button to transfer control, lacking a comprehensive mechanism for identifying multi-dimensional abnormal conditions, which can easily lead to erroneous switching or delayed switching.

[0003] Furthermore, the existing control handover process lacks strict authentication and operation traceability mechanisms, and manual control channels and automatic control circuits are not physically isolated, posing the risk of command conflicts. For emergency response, conventional systems rely on a single emergency stop circuit, which is susceptible to interference in the complex electromagnetic environment underground, leading to malfunctions or failures. These shortcomings make it difficult for existing systems to balance the efficiency of automated control with the reliability of manual intervention, potentially delaying emergency response in the event of an unexpected operating condition. Summary of the Invention

[0004] In response to the above technical problems, the present invention provides an automatic control system for underground power supply in coal mines, which 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 of the underground power supply system in coal mines.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: An automatic power supply control system for an underground coal mine, comprising: Ground master station monitoring module, used to monitor the power supply system status and issue control instructions; Communication network module, building redundant communication links above and below the well; Underground monitoring substation module, collecting operating parameters of power supply equipment; Intelligent control module, including automatic control unit, manual control unit and control right switching decision unit; Condition monitoring module, integrating environmental parameters, equipment health and power quality monitoring functions; The authority handover verification module implements identity authentication and authority locking when transferring control rights; Redundant sensor network module, deploying multi-source heterogeneous sensor groups and verifying data consistency; Dual-channel control command verification module, separating automatic control and manual control command transmission channels; The control status indication module displays the current control ownership status and transfer process prompts; Emergency intervention module, equipped with hard-wired and wireless dual backup emergency control channels; The control switching decision unit judges the results of the multi-dimensional data of the status monitoring module. When the environmental parameters, equipment health and power supply quality exceed the safety threshold at the same time, it triggers the control transfer process and completes the authority transfer through the authority handover verification module.

[0006] The status monitoring module includes: Environmental parameter monitoring submodule collects gas concentration, temperature, humidity and ventilation data in real time; The equipment health assessment submodule analyzes insulation resistance, contactor operation times, and load fluctuation characteristics; The power quality analysis submodule monitors voltage harmonic distortion, three-phase imbalance, and transient overvoltage events.

[0007] The equipment health assessment submodule includes: Insulation performance monitoring unit, real-time measurement of the insulation resistance of the equipment to the ground; Mechanical wear assessment unit, which counts the number of contactor opening and closing times and predicts the remaining lifespan; The load fluctuation analysis unit identifies abnormal load changes through current waveform characteristics.

[0008] The redundant sensor network module includes: Three sets of environmental sensors use infrared absorption, laser scattering and electrochemical principles to detect gas concentration; Dual redundant equipment status sensor set, including a cross-validated combination of vibration and temperature sensors; The data consistency check unit triggers automatic calibration when the data deviation of the same type of sensors exceeds 5%.

[0009] The authority handover verification module includes: Biometric identification unit to verify operator identity through fingerprint or iris; Dynamic password verification unit, generating a one-time operation password synchronized with the ground master station clock; The authority locking unit implements electrical isolation of the automatic control circuit after the control right is transferred.

[0010] The dual-channel control instruction verification module includes: Automatic control channel, using industrial Ethernet protocol to transmit digital control instructions; Manual control channel, which transmits operating instructions through hard-wired relay circuits; Channel isolation unit, using optocoupler devices to achieve electrical isolation; The command conflict arbitration unit gives priority to executing manual control channel commands.

[0011] The control right status indication module includes: Distributed LED light strip indicator device is arranged along the power supply line and displays red / yellow / green status; The three-dimensional topology diagram of the HMI interface dynamically displays the ownership of each area's control rights; The voice guidance unit provides operation prompts during the authority transfer process.

[0012] The emergency intervention module includes: Hard-wired emergency stop circuit, using a normally closed contact series circuit with independent power supply; Wireless emergency channel, using frequency hopping spread spectrum technology to transmit emergency stop commands; Priority management unit, setting hard-wire loop priority response mechanism; The dual trigger verification unit needs to receive two independent signals at the same time to execute power off.

[0013] The intelligent control module also includes: Control mode self-check unit, regularly checks the integrity of automatic and manual control channels; Switching mechanism test unit, simulating the control transfer process under abnormal conditions; The fault injection detection unit verifies the emergency response capability of the authority handover verification module.

[0014] It also includes a control transfer recording unit, which records in detail the transfer trigger time, abnormal parameters, operator identity, equipment status change data and reset operation log, forming a complete traceable operation chain.

[0015] Compared with the prior art, the present invention has the following beneficial effects: This invention uses a multi-dimensional condition monitoring module to comprehensively assess environmental, equipment, and power quality parameters, significantly improving the accuracy of abnormal condition identification. A redundant sensor network and data verification mechanism effectively prevent malfunctions caused by false alarms from a single sensor.

[0016] Dual-channel control command verification achieves physical isolation between automatic and manual control, completely eliminating the risk of command conflict; the authority handover verification module uses dual authentication of biometrics and dynamic passwords to ensure the security of control transfer.

[0017] 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 preserves the operation process data, providing a reliable basis for accident tracing. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a connection block diagram of the present invention. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0020] like Figure 1 As shown in the figure, the core of this underground coal mine power supply automatic control system lies in the construction of a multi-level automatic control authority switching mechanism. Through the combination of hardware redundancy and logic verification, it achieves a safe connection between intelligent control and manual intervention. During system implementation, the main monitoring platform is first deployed at the ground dispatch center. This platform is equipped with a large display screen and operation terminal, which can display 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 power supply nodes underground. Each substation integrates environmental sensors, electrical parameter acquisition units, and command execution mechanisms, and establishes a two-way data channel with the ground master station via a dual-ring network communication architecture.

[0021] The system's intelligent control module adopts a dual-processor architecture. The main processor executes the preset automatic control program, and the backup processor specializes in handling abnormal situation identification. When the underground environmental sensor detects abnormal gas concentration, excessive temperature or insufficient ventilation, the equipment health assessment unit simultaneously analyzes the insulation performance, mechanical wear and other indicators of the power supply equipment, and the power supply quality analysis unit monitors voltage fluctuations and harmonic distortion. After comprehensive judgment of these three types of data, if they exceed the safety threshold at the same time, the control switching decision unit immediately initiates the authority transfer process. At this time, the ground operation station issues an audible and visual alarm, and the operator needs to take over control through fingerprint recognition and dynamic password dual verification. After successful verification, the system automatically cuts off the automatic control loop and activates the manual operation interface.

[0022] To ensure reliable control transfers, the system employs a triple security mechanism: the first layer is a redundant sensor network, with three sets of sensors using different principles deployed in key areas for cross-verification. A review process is automatically triggered when data deviations exceed a preset threshold. The second layer is dual-channel control command verification, with automatic control signals transmitted via a digital communication network and manual control commands transmitted via an independent hard-wired circuit. The two are physically isolated and feature a conflict detection priority mechanism. The third layer is an emergency intervention system equipped with a dual backup of a hard-wired emergency stop button and a wireless remote control device. The emergency stop command requires simultaneous receipt of two independent signals to execute a power-off operation. All control transfer processes are fully recorded, including triggering causes, operator information, equipment status changes, and other data, forming a traceable operation log.

[0023] 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 pre-set procedure. During a certain equipment inspection, environmental sensors detected a continuous increase in gas concentration in a certain area. Simultaneously, the insulation resistance of the high-voltage switchgear in the area showed abnormal fluctuations. Power quality analysis indicated that the voltage harmonic content in this circuit exceeded the standard. After analyzing these three abnormal indicators, the control transfer decision unit immediately sent a control transfer request to the ground master station.

[0024] Upon receiving the request, the surface operator first completes fingerprint verification on the control console, then obtains a system-generated dynamic verification code for secondary confirmation. During the authority transfer process, the automatic control circuits of the relevant underground equipment are electrically isolated, and equipment operation authority is switched to manual control mode. Simultaneously, the LED indicator bar of the power supply line in the area turns red and flashes. The operator remotely disconnects the faulty circuit through the manual control interface and activates the backup power supply line. The system automatically records key time points and equipment status data of the entire handover process, generating a complete emergency response report.

[0025] Using a combination of biometric recognition and dynamic passwords, the console is equipped with a fingerprint reader and a dynamic password display. Verification information is synchronized with the ground master station database in real time to ensure that only authorized personnel can take over system control in an emergency.

[0026] Three groups of environmental sensors are deployed at key locations such as tunnel intersections and equipment-intensive areas, using infrared, laser, and electrochemical detection principles. The data comparison module continuously monitors the consistency of each group of data to eliminate the risk of false alarms from a single sensor.

[0027] The automatic control channel uses industrial Ethernet to transmit digital instructions, and the manual control channel adopts a relay hard-wired circuit. A photoelectric isolation barrier is set between the two channels to ensure that manual instructions can be executed with absolute priority when automatic control fails.

[0028] Emergency stop buttons are installed at regular intervals in the underground tunnels. Each button box contains two emergency stop switches connected in series and is equipped with a wireless remote control transmitter. Emergency stop commands must be triggered simultaneously by two independent signal sources (e.g., wired and wireless) to take effect, preventing accidental power outages caused by misoperation.

[0029] LED light strips are installed along the power cable. They illuminate green during normal operation, flash yellow during control transfer, and turn solid red after an emergency power outage. A three-dimensional dynamic diagram is displayed simultaneously on the ground monitoring interface, with different colors used to distinguish the control status of each area.

[0030] Through hardware architecture design and management process innovation, the present invention establishes a reliable manual intervention channel while ensuring the degree of system automation, meeting the special requirements of the complex environment of underground coal mines for the safety and reliability of the power supply control system.

[0031] Only the preferred embodiments of the present invention have been described in detail above, 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: Ground master station monitoring module, used to monitor the power supply system status and issue control instructions; Communication network module, building redundant communication links above and below the well; Underground monitoring substation module, collecting operating parameters of power supply equipment; Intelligent control module, including automatic control unit, manual control unit and control right switching decision unit; Condition monitoring module, integrating environmental parameters, equipment health and power quality monitoring functions; The authority handover verification module implements identity authentication and authority locking when transferring control rights; Redundant sensor network module, deploying multi-source heterogeneous sensor groups and verifying data consistency; Dual-channel control command verification module, separating automatic control and manual control command transmission channels; The control status indication module displays the current control ownership status and transfer process prompts; Emergency intervention module, equipped with hard-wired and wireless dual backup emergency control channels; The control switching decision unit judges the results of the multi-dimensional data of the status monitoring module. When the environmental parameters, equipment health and power supply quality exceed the safety threshold at the same time, it triggers the control transfer process and completes the authority transfer through the authority handover verification module.

2. The automatic power supply control system for underground coal mines according to claim 1, characterized in that: The status monitoring module includes: Environmental parameter monitoring submodule collects gas concentration, temperature, humidity and ventilation data in real time; The equipment health assessment submodule analyzes insulation resistance, contactor operation times, and load fluctuation characteristics; The power quality analysis submodule monitors voltage harmonic distortion, three-phase imbalance, and transient overvoltage events.

3. The automatic power supply control system for underground coal mines according to claim 2, characterized in that: The equipment health assessment submodule includes: Insulation performance monitoring unit, real-time measurement of the insulation resistance of the equipment to the ground; Mechanical wear assessment unit, which counts the number of contactor opening and closing times and predicts the remaining lifespan; The load fluctuation analysis unit identifies abnormal load changes through current waveform characteristics.

4. The automatic power supply control system for underground coal mines according to claim 1, characterized in that: The redundant sensor network module includes: Three sets of environmental sensors use infrared absorption, laser scattering and electrochemical principles to detect gas concentration; Dual redundant equipment status sensor set, including a cross-validated combination of vibration and temperature sensors; The data consistency check unit triggers automatic calibration when the data deviation of the same type of sensors exceeds 5%.

5. The automatic power supply control system for underground coal mines according to claim 1, characterized in that: The authority handover verification module includes: Biometric identification unit to verify operator identity through fingerprint or iris; Dynamic password verification unit, generating a one-time operation password synchronized with the ground master station clock; The authority locking unit implements electrical isolation of the automatic control circuit after the control right is transferred.

6. The automatic power supply control system for underground coal mines according to claim 1, characterized in that: The dual-channel control instruction verification module includes: Automatic control channel, using industrial Ethernet protocol to transmit digital control instructions; Manual control channel, which transmits operating instructions through hard-wired relay circuits; Channel isolation unit, using optocoupler devices to achieve electrical isolation; The command conflict arbitration unit gives priority to executing manual control channel commands.

7. The automatic power supply control system for underground coal mines according to claim 1, characterized in that: The control right status indication module includes: Distributed LED light strip indicator device is arranged along the power supply line and displays red / yellow / green status; The three-dimensional topology diagram of the HMI interface dynamically displays the ownership of each area's control rights; The voice guidance unit provides operation prompts during the authority transfer process.

8. The automatic power supply control system for underground coal mines according to claim 1, characterized in that: The emergency intervention module includes: Hard-wired emergency stop circuit, using a normally closed contact series circuit with independent power supply; Wireless emergency channel, using frequency hopping spread spectrum technology to transmit emergency stop commands; Priority management unit, setting hard-wire loop priority response mechanism; The dual trigger verification unit needs to receive two independent signals at the same time to execute power off.

9. The automatic power supply control system for underground coal mines according to claim 1, characterized in that: The intelligent control module further includes: Control mode self-check unit, regularly checks the integrity of automatic and manual control channels; Switching mechanism test unit, simulating the control transfer process under abnormal conditions; The fault injection detection unit verifies the emergency response capability of the authority handover verification module.

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

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