Offshore unmanned platform electric heat tracing multi-stage intelligent regulation system and method

Abstract

The application provides a kind of offshore unmanned platform electric heat tracing multi-stage intelligent regulation and control system and method, a manned platform is connected with multiple unmanned platforms corresponding;Control integrated machine, temperature probe and operator station are set on manned platform;Serial port to Ethernet module, central control system, power transformer, multi-master station communication coordinator, communication module, power module, intelligent switch and self-control temperature electric heat tracing band are set on unmanned platform.The beneficial effects of the present application are: using industrial computer and central control system collaborative control architecture, seamless switching between master station and slave station, the high reliability and fault fast recovery capability of the system are obviously improved.The system innovatively constructs four-level electric heat tracing putting into use / exit mechanism, through real-time monitoring of environmental temperature, equipment state and multi-source sensor data, dynamically optimizes electric heat tracing operation mode, energy-saving effect is remarkable, at the same time, the problem of single traditional electric heat tracing control and insufficient reliability is solved.

Description

Technical Field

[0001] This invention relates to the field of electric heat tracing technology, and more specifically to a multi-level intelligent control system and method for electric heat tracing on unmanned offshore platforms. Background Technology

[0002] In recent years, with the continuous development of automation and intelligent technologies, the number of unmanned offshore oil production platforms has increased rapidly. The application of unmanned offshore platforms has effectively reduced the cost of offshore oil and gas extraction and improved operational efficiency. However, the remote and automatic control technology of electric heat tracing for unmanned platforms still faces many severe challenges.

[0003] The unmanned platform remains unattended for extended periods, requiring manual control of the electric heat tracing system upon startup and shutdown, which is extremely inconvenient. To cope with production process adjustments, shutdowns, and extreme weather conditions, and to ensure safe and stable production, the electric heat tracing system is forced into long-term operation. However, when temperatures rise and low temperatures no longer affect the production process, continuous operation of the electric heat tracing system results in significant electricity waste, increasing oilfield production costs.

[0004] In some onshore industries, electric heat tracing control systems have been successfully introduced, achieving energy conservation, reduced consumption, and lessened labor intensity for employees through automatic start-up and shutdown of the heat tracing system. However, existing electric heat tracing control systems can only perform simple control based on environmental and pipe wall temperatures, failing to efficiently integrate platform equipment operating status and data from various sensors such as temperature, pressure, and flow. When faced with complex operating conditions such as changes in equipment operating status, production process adjustments, and process shutdowns, existing systems cannot achieve scientific start-up and precise control of the heat tracing system. Furthermore, existing electric heat tracing systems have a single control method, low reliability, and difficulty in achieving diversified control. In the event of a malfunction, the system cannot be remotely and quickly repaired in harsh sea conditions. A failure of the electric heat tracing system will seriously impact the safety and stability of the platform.

[0005] Therefore, there is an urgent need for a multi-level intelligent control system and method for electric heat tracing on unmanned offshore platforms to solve the above-mentioned technical problems. Summary of the Invention

[0006] This invention overcomes the shortcomings of the prior art and provides a multi-level intelligent control system and method for electric heat tracing on unmanned offshore platforms.

[0007] The multi-level intelligent control system for electric heat tracing on unmanned offshore platforms includes: one manned platform connected to multiple unmanned platforms; The industrial control computer, temperature probe, and operator station are installed on the manned platform; The serial-to-Ethernet module, central control system, power transformer, multi-master station communication coordinator, communication module, power supply module, smart switch and self-regulating temperature tracing cable are installed on the unmanned platform; The industrial control all-in-one computer is connected to the temperature probe and the serial-to-Ethernet module respectively; the serial-to-Ethernet module, the multi-master station communication coordinator and the central control system are interconnected; the central control system is connected to the operator station; the communication module is connected to the multi-master station communication coordinator and the smart switch respectively; the smart switch is connected to the communication module, the power transformer, the power supply module and the self-regulating temperature tracing cable respectively.

[0008] When the central control system communicates with the industrial control all-in-one computer, the central control system acts as a substation, used to transmit the operating status of platform equipment and sensor data; When the central control system is used for basic data monitoring and emergency control of electric heat tracing, the central control system acts as the master station, enabling seamless takeover control when the industrial control unit malfunctions.

[0009] The multi-master communication coordinator adopts an RS-485 multi-master data acquisition unit with two master stations and one slave station.

[0010] The signal commands for activating or deactivating electric heat tracing are classified into different levels. Different judgment conditions and corresponding operation steps are set for each level of the classified signal commands for activating or deactivating electric heat tracing. In automatic mode, the industrial control computer judges the conditions according to the specific situation of each device to determine the corresponding signal command level for activating or deactivating electric heat tracing, and executes the operation steps corresponding to the signal command level for activating or deactivating electric heat tracing to realize the electric heat tracing control function.

[0011] The specific signal command levels for activating or deactivating electric heat tracing include: Level L1: Long-term power supply is carried out at Level L1. The target devices for power supply include ESD transmitters and PCS transmitters in the crude oil system. Level L2 refers to the use of the corresponding method for power supply when the ambient temperature of the equipment is 5-30℃. The target devices of Level L2 include ESD transmitters, PCS transmitters, process dead points, chemical agent pipelines, equipment lubrication oil pipelines, decommissioned equipment and decommissioned processes, excluding crude oil systems. Level L3: When the ambient temperature of the equipment drops to 0℃, the corresponding method of Level L3 is used to supply power. The target devices of Level L3 include fresh water pipelines and fire water pipelines. Level L4: Tanks and main process pipeline equipment in normal operation are at Level L4, and no power supply is required in Level L4 state.

[0012] In the automatic control of the industrial control integrated computer, the signal command for activating electric heat tracing is executed sequentially according to the priority levels from L1 to L4, while the signal command for deactivating electric heat tracing can be executed simultaneously. When the temperature of the process medium is lower than the minimum temperature threshold set for the pipeline and tank outer wall used for platform fluid flow, electric heat tracing is automatically activated. When the temperature of the process medium is higher than the minimum temperature threshold set for the pipeline and tank outer wall used for platform fluid flow by 2°C, electric heat tracing is automatically deactivated.

[0013] An execution program is set up in the industrial control integrated computer. The execution program dynamically draws the process pipeline operation and electric heat tracing control flowchart based on the parameters of each device on the unmanned platform, the operating status of the device, and the signal command level status of the electric heat tracing being put into or taken out of operation.

[0014] A multi-level intelligent control method for electric heat tracing on unmanned offshore platforms is used to control a system as described in any one of claims 1-7 above, and the specific steps include: S1. When the industrial control all-in-one machine is in automatic mode, it performs electric heat tracing control functions, data acquisition and display tasks. The central control system, as the master station, determines whether the platform should be shut down based on the operating status of the platform equipment and the feedback data from various sensors in the system. When a platform shutdown is detected, execute S2; If it is determined that no platform shutdown has occurred, execute S4; S2. The central control system, acting as the master station, continues to determine whether the platform-induced shutdown is a production shutdown or an air pollution shutdown. When the gas is shut down, the central control system, as the master station, transmits the power-off signal of all electric heating to the multi-master station communication coordinator via RS-485 communication. Then, through the communication module and smart switch, it automatically disconnects all self-regulating electric heating tapes on the gas shutdown platform and executes S3. When production is determined to be shut down, the central control system, as the master station, transmits the signal to activate all electric heating cables to the multi-master station communication coordinator via RS-485 communication. Then, through the communication module and smart switch, it automatically activates all self-regulating electric heating cables on the production shutdown platform and executes S3. S3. The central control system, as a substation, transmits the production shutdown signal to the corresponding industrial control all-in-one computer via RS-485 communication. After receiving the signal, the industrial control all-in-one computer exits the original electric heat tracing control function and only performs data acquisition and display tasks. S4. Determine the control mode selected by the operator on the operator station; When the control mode is local control mode, the central control system, as the master station, transmits the signal for the electric heat tracing to be put into use or taken out of use to the multi-master station communication coordinator via RS-485 communication. The self-regulating electric heat tracing tape is controlled according to actual needs through the communication module and smart switch. When the control mode is remote control mode, the industrial control all-in-one computer communicates with the central control system as a substation via RS-485 to obtain control authority of the multi-level intelligent control system for electric heat tracing on the marine unmanned platform. The central control system, as the master station, exits the electric heat tracing control function and only performs data acquisition and display tasks. In manual control mode, the industrial control unit transmits the electric heat tracing activation or deactivation signal to the serial-to-Ethernet module via Ethernet communication. The multi-master communication coordinator, communication module, and smart switch control the electric heat tracing according to actual needs.

[0015] Depending on the operating mode, the execution interval of the electric heat tracing activation signal command is as follows: In manual operation mode, the execution interval is 2 seconds; In automatic control mode, the execution interval is 40 seconds, and the total operating current of the multi-level intelligent control system for electric heat tracing on the offshore unmanned platform does not exceed 90% of the transformer's rated current. When the control mode is switched, the electric heat tracing system will remain in operation or off state for 60 seconds before executing the corresponding instructions according to the conditions of the latest control mode.

[0016] The beneficial effects of this invention are as follows: This invention adopts a collaborative control architecture between an industrial control integrated computer and a central control system, enabling seamless switching between master and slave stations, significantly improving the system's high reliability and rapid fault recovery capabilities. The system innovatively constructs a four-level electric heat tracing activation / deactivation mechanism, dynamically optimizing the electric heat tracing operation mode by real-time monitoring of ambient temperature, equipment status, and multi-source sensor data, resulting in significant energy savings. Simultaneously, it solves the problems of single control and insufficient reliability in traditional electric heat tracing, providing a reliable guarantee for the continuity and stability of offshore oil and gas extraction. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the multi-level intelligent control system for electric heat tracing on unmanned offshore platforms provided by the present invention. Figure 2 This is a flowchart of the multi-level intelligent control method for electric heat tracing on unmanned offshore platforms provided by the present invention; In the diagram: 10. Manned platform; 101. Industrial control computer; 102. Temperature probe; 103. Operator station; 20. Unmanned platform; 201. Serial-to-Ethernet module; 202. Central control system; 203. Power transformer; 204. Multi-master communication coordinator; 205. Communication module; 206. Power module; 207. Smart switch; 208. Self-regulating heating tape. Detailed Implementation

[0018] Example The 20-level intelligent control system for electric heat tracing on unmanned offshore platforms includes: One manned platform 10 is connected to multiple unmanned platforms 20. The industrial control all-in-one computer 101, temperature probe 102 and operator station 103 are installed on the manned platform 10; The serial-to-Ethernet module 201, the central control system 202, the power transformer 203, the multi-master station communication coordinator 204, the communication module 205, the power supply module 206, the smart switch 207, and the self-regulating temperature tracing cable 208 are installed on the unmanned platform 20. The industrial control all-in-one computer 101 is connected to the temperature probe 102 and the serial-to-Ethernet module 201 respectively; the serial-to-Ethernet module 201, the multi-master station communication coordinator 204 and the central control system 202 are interconnected; the central control system 202 is connected to the operator station 103; the communication module 205 is connected to the multi-master station communication coordinator 204 and the smart switch 207 respectively; the smart switch 207 is connected to the communication module 205, the power transformer 203, the power supply module 206 and the self-regulating temperature tracing cable 208 respectively.

[0019] When the central control system 202 communicates with the industrial control all-in-one computer 101, the central control system 202 acts as a substation to transmit the operating status of the platform equipment and sensor data; When the central control system 202 is used for basic data monitoring and emergency control of electric heat tracing, the central control system 202 acts as the master station, enabling the central control system 202 to seamlessly take over control when the industrial control all-in-one machine 101 fails.

[0020] The multi-master communication coordinator 204 adopts an RS-485 multi-master data acquisition device with two master stations and one slave station to coordinate the communication between the industrial control all-in-one computer 101 and the central control system 202 and prevent data conflicts.

[0021] like Figure 1 As shown, the multi-level intelligent control system for electric heat tracing on the unmanned offshore platform 20 operates in automatic mode via the industrial control unit 101. The central control system 202 is defined as a substation, working in conjunction with the central control system 202 to read the operating status of the platform equipment and data from various sensors such as temperature, pressure, and flow rate. This substation performs electric heat tracing control functions, data acquisition, and display tasks. Through manual settings and logical calculations, the system enables scientific start-up and precise control of electric heat tracing in complex operating conditions such as changes in equipment operating status, adjustments to production processes, and process shutdowns.

[0022] Furthermore, the central control system 202 also serves as the master station, responsible for basic data monitoring and emergency control of electric heat tracing. When the industrial control all-in-one machine 101 malfunctions, the central control system immediately and seamlessly takes over the work, ensuring uninterrupted communication between the master station and the slave station, thus establishing a highly efficient dual-system collaborative control mode with the industrial control all-in-one machine 101 as the master and the central control system 202 as the auxiliary.

[0023] Furthermore, the temperature probe 102 serves as a sensor, providing ambient temperature values ​​to the industrial control all-in-one computer 101. Preferably, the temperature probe 102 is mounted on the manned platform 10 for easier maintenance.

[0024] Furthermore, the operator station 103 is connected to the central control system 202, and the electric heat tracing system of the unmanned platform 20 is controlled through the central control system 202.

[0025] Furthermore, the serial-to-Ethernet module 201 is used to connect the devices of the central control system 202 and the multi-master communication coordinator 204 to the Ethernet network, forming a networked device management system.

[0026] Furthermore, the multi-master communication coordinator 204 prevents conflicts from occurring when the industrial control all-in-one computer 101 and the central control system 202 simultaneously access the communication module 205, ensuring that the two master stations can transmit data in an orderly manner.

[0027] Furthermore, the smart switch 207 has short-circuit, overload, leakage, and undervoltage protection functions, can measure the temperature of the upper and lower terminals in real time, and supports remote fault reset; the smart switch 207 is connected to the power transformer 203 to obtain power and control the activation / deactivation of the self-regulating heating cable 208; the power module 206 is connected to the communication module 205 and the smart switch 207 to provide control power for the communication module 205 and the smart switch 207.

[0028] Preferably, the industrial control computer 101 and the temperature probe 102 are connected via a serial-to-Ethernet module.

[0029] Preferably, two temperature probes 102 are used.

[0030] Preferably, the industrial control all-in-one computer 101 and the serial-to-Ethernet module 201 use separate physical links and are connected via submarine optical fiber and optical fiber transceiver.

[0031] Preferably, the multi-master communication coordinator 204 is a dual-master, one-slave RS-485 multi-master data acquisition unit, and its power supply is provided separately by the platform.

[0032] Preferably, the central control system 202 uses two communication modules, which are respectively connected to the serial-to-Ethernet module 201 and the multi-master communication coordinator 204; Preferably, the power module 206, communication module 205 and smart switch 207 are connected by a six-pin header. One power module 206 can connect to a maximum of six smart switches 207, and one communication module 205 can connect to a maximum of twenty-nine smart switches 207. A header extension cable can be used to connect multiple rows of switches.

[0033] Preferably, the power supply for the power module 206 is provided separately by the platform.

[0034] Preferably, one manned platform 10 can connect to and control 2-6 unmanned platforms 20, and the number of smart switches 207 set on a single unmanned platform 20 is 50-174.

[0035] The signal commands for activating or deactivating electric heat tracing are classified into different levels. Different judgment conditions and corresponding operation steps are set for each level of the classified signal commands for activating or deactivating electric heat tracing. In automatic mode, the industrial control computer 101 judges the conditions according to the specific situation of each device to determine the corresponding signal command level for activating or deactivating electric heat tracing, and executes the operation steps corresponding to the signal command level for activating or deactivating electric heat tracing to realize the electric heat tracing control function.

[0036] The specific signal command levels for activating or deactivating electric heat tracing include: Level L1: Level L1 devices do not participate in automatic mode control. They are continuously powered, and the target devices include the ESD transmitters and PCS transmitters in the crude oil system. Under Level L1, the electric heat tracing needs to be laid separately and is not shared with the tank or main process pipeline.

[0037] Level L2 refers to the use of the corresponding method for power supply when the ambient temperature of the equipment is 5-30℃. The target devices of Level L2 include ESD transmitters, PCS transmitters, process dead points, chemical agent pipelines, equipment lubrication oil pipelines, decommissioned equipment and decommissioned processes, excluding crude oil systems. Level L3: When the ambient temperature of the equipment drops to 0℃, the corresponding method of Level L3 is used to supply power. The target devices of Level L3 include fresh water pipelines and fire water pipelines. Level L4 refers to normally operating tanks and main process pipeline equipment. At Level L4, no power supply is required. This includes normally operating tanks and main process pipelines.

[0038] Furthermore, in the signal command level for activating or deactivating electric heat tracing, Level L1 does not participate in automatic mode control. When deactivating Level L1 electric heat tracing, the operator's name and password must be entered for verification before operation privileges can be obtained. When two levels of equipment share a single self-regulating electric heat tracing cable 208, the activation or deactivation of the electric heat tracing shall be performed according to the signal command principle for activating the higher-level electric heat tracing.

[0039] In automatic control, the signal commands for activating electric heat tracing are executed sequentially according to priority levels L1 to L4 in the industrial control integrated computer 101, while the signal commands for deactivating electric heat tracing can be executed simultaneously. When the temperature of the process medium is lower than the minimum temperature threshold set for the pipelines and outer walls of the tanks used for platform fluid flow, electric heat tracing is automatically activated. When the temperature of the process medium is 2°C higher than the minimum temperature threshold set for the pipelines and outer walls of the tanks used for platform fluid flow, electric heat tracing is automatically deactivated.

[0040] An execution program is set in the industrial control integrated computer 101. The execution program dynamically draws the process pipeline operation and electric heat tracing control flowchart based on the parameters of each device in the unmanned platform 20, the device operating status, and the signal command level status of electric heat tracing being put into or taken out of operation.

[0041] The 101 industrial control computer has a built-in program that, based on the unmanned platform equipment's design processing capacity (covering oil, gas, and water), equipment capacity, design pressure, operating pressure, pipeline dimensions, process medium, minimum design temperature of pipelines and tank outer walls, valve names, valve status, temperature, liquid level, pressure and flow values, equipment operating status, and electric heat tracing activation or deactivation status, draws process pipeline operation and electric heat tracing control flowcharts within the industrial control computer, realizing the function of visual management.

[0042] The process pipeline operation and electric heat tracing control flow chart has a dynamic display function. In this program, the equipment design throughput (covering oil, gas and water), equipment capacity, design pressure, operating pressure, pipeline size, process medium, minimum design temperature of pipeline and tank outer wall, and valve name are all set according to the unmanned platform flow chart.

[0043] Preferably, the temperature, liquid level, pressure, and flow rate values, as well as the equipment operating status, are obtained through communication between the industrial control all-in-one computer 101 and the central control system 202, which serves as a substation; the status of electric heat tracing being in operation or out of operation is obtained through communication between the industrial control all-in-one computer 101 and the smart switch 207.

[0044] like Figure 2 As shown, the specific steps of the multi-level intelligent control method for electric heat tracing on unmanned offshore platforms include: S1, the industrial control all-in-one computer 101 is in automatic mode, performing electric heat tracing control function, data acquisition and display tasks. The central control system 202, as the master station, determines whether the platform shutdown has occurred based on the platform equipment operating status and feedback data from various sensors in the system. When a platform shutdown is detected, execute S2; If it is determined that no platform shutdown has occurred, execute S4; S2, the central control system 202, as the master station, continues to determine whether the platform-induced shutdown is a production shutdown or an air pollution shutdown; When the gas is shut down, the central control system 202, as the master station, transmits the power-off signal of all electric heating to the multi-master station communication coordinator 204 via RS-485 communication. Then, through the communication module 205 and the smart switch 207, it automatically disconnects all self-regulating electric heating tapes 208 on the gas shutdown platform and executes S3. When production is determined to be shut down, the central control system 202, as the master station, transmits the signal for all electric heating to be put into use to the multi-master station communication coordinator 204 via RS-485 communication. Then, through the communication module 205 and the smart switch 207, all self-regulating electric heating tapes 208 on the production shutdown platform are automatically put into use, and S3 is executed. S3, the central control system 202, as a substation, transmits the production shutdown signal to the corresponding industrial control all-in-one computer 101 via RS-485 communication. After receiving the signal, the industrial control all-in-one computer 101 exits the original electric heat tracing control function and only performs data acquisition and display tasks. S4. Determine the control mode selected by the operator on operator station 103; When the control mode is local control mode, the central control system 202, as the master station, transmits the signal for the electric heat tracing to be put into use or taken out of use to the multi-master station communication coordinator 204 via RS-485 communication. The communication module 205 and the smart switch 207 control the self-regulating electric heat tracing tape 208 according to actual needs. Preferably, in local control mode, the operator at operator station 103 can control the activation or deactivation of a single electric heat tracing circuit, and can also control the activation or deactivation of all electric heat tracing circuits on a single platform with one click.

[0045] When the control mode is remote control mode, the industrial control all-in-one computer 101 communicates with the central control system 202 as a substation via RS-485 communication to obtain the control authority of the multi-level intelligent control system for electric heat tracing of the marine unmanned platform 20. The central control system 202, as the master station, exits the electric heat tracing control function and only performs data acquisition and display tasks. In manual control mode, the industrial control unit 101 transmits the signal for the electric heat tracing to be turned on or off via Ethernet communication to the serial-to-Ethernet module 201. The multi-master communication coordinator 204, the communication module 205, and the smart switch 207 control the electric heat tracing according to actual needs.

[0046] Preferably, when an operator selects local control at the operator station in the central control room, the operator must enter their name and password, and only after successful verification can they obtain operating privileges.

[0047] Depending on the operating mode, the execution interval of the electric heat tracing activation signal command is as follows: In manual operation mode, the execution interval is 2 seconds; In automatic control mode, the execution interval is 40 seconds, and the total operating current of the 20-level intelligent control system for electric heat tracing on the offshore unmanned platform does not exceed 90% of the transformer's rated current. When the control mode is switched, the electric heat tracing system will remain in operation or off state for 60 seconds before executing the corresponding instructions according to the conditions of the latest control mode.

[0048] The embodiments of the present invention have been described in detail above, but the content described is only a preferred embodiment of the present invention and should not be considered as limiting the scope of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the patent coverage of the present invention.

Claims

1. A multi-level intelligent control system for electric heat tracing on unmanned offshore platforms, characterized in that: include: One manned platform is connected to multiple corresponding unmanned platforms; The industrial control computer, temperature probe, and operator station are installed on the manned platform; The serial-to-Ethernet module, central control system, power transformer, multi-master station communication coordinator, communication module, power supply module, smart switch and self-regulating temperature tracing cable are installed on the unmanned platform; The industrial control all-in-one computer is connected to the temperature probe and the serial-to-Ethernet module respectively; the serial-to-Ethernet module, the multi-master communication coordinator, and the central control system are interconnected; the central control system is connected to the operator station; The communication module is connected to the multi-master station communication coordinator and the smart switch respectively; the smart switch is connected to the communication module, the power transformer, the power supply module and the self-regulating temperature tracing cable respectively.

2. The multi-level intelligent control system for electric heat tracing on unmanned offshore platforms according to claim 1, characterized in that: When the central control system communicates with the industrial control all-in-one computer, the central control system acts as a substation, used to transmit the operating status of platform equipment and sensor data; When the central control system is used for basic data monitoring and emergency control of electric heat tracing, the central control system acts as the master station, enabling seamless takeover control when the industrial control unit malfunctions.

3. The multi-level intelligent control system for electric heat tracing on unmanned offshore platforms according to claim 1, characterized in that: The multi-master communication coordinator adopts an RS-485 multi-master data acquisition unit with two master stations and one slave station.

4. The multi-level intelligent control system for electric heat tracing on unmanned offshore platforms according to claim 1, characterized in that: The signal commands for activating or deactivating electric heat tracing are classified into different levels. Different judgment conditions and corresponding operation steps are set for each level of the classified signal commands for activating or deactivating electric heat tracing. In automatic mode, the industrial control computer judges the conditions according to the specific situation of each device to determine the corresponding signal command level for activating or deactivating electric heat tracing, and executes the operation steps corresponding to the signal command level for activating or deactivating electric heat tracing to realize the electric heat tracing control function.

5. The multi-level intelligent control system for electric heat tracing on unmanned offshore platforms according to claim 4, characterized in that, The specific signal command levels for activating or deactivating electric heat tracing include: Level L1: Level L1 does not participate in automatic mode control. It provides long-term power supply. The target devices for power supply include the ESD transmitter and PCS transmitter of the crude oil system. Level L2 refers to the use of the corresponding method for power supply when the ambient temperature of the equipment is 5-30℃. The target devices of Level L2 include ESD transmitters, PCS transmitters, process dead points, chemical agent pipelines, equipment lubrication oil pipelines, decommissioned equipment and decommissioned processes, excluding crude oil systems. Level L3: When the ambient temperature of the equipment drops to 0℃, the corresponding method of Level L3 is used to supply power. The target devices of Level L3 include fresh water pipelines and fire water pipelines. Level L4: Tanks and main process pipeline equipment in normal operation are at Level L4, and no power supply is required in Level L4 state.

6. The multi-level intelligent control system for electric heat tracing on unmanned offshore platforms according to claim 5, characterized in that: In the automatic control of the industrial control integrated computer, the signal command for activating electric heat tracing is executed sequentially according to the priority levels from L1 to L4, while the signal command for deactivating electric heat tracing can be executed simultaneously. When the temperature of the process medium is lower than the minimum temperature threshold set for the pipeline and tank outer wall used for platform fluid flow, electric heat tracing is automatically activated. When the temperature of the process medium is higher than the minimum temperature threshold set for the pipeline and tank outer wall used for platform fluid flow by 2°C, electric heat tracing is automatically deactivated.

7. The multi-level intelligent control system for electric heat tracing on unmanned offshore platforms according to claim 5, characterized in that: An execution program is set up in the industrial control integrated computer. The execution program dynamically draws the process pipeline operation and electric heat tracing control flowchart based on the parameters of each device on the unmanned platform, the operating status of the device, and the signal command level status of the electric heat tracing being put into or taken out of operation.

8. A multi-level intelligent control method for electric heat tracing on unmanned offshore platforms is used to control a system as described in any one of claims 1-7 above, characterized in that, The specific steps include: S1. When the industrial control all-in-one machine is in automatic mode, it performs electric heat tracing control functions, data acquisition and display tasks. The central control system, as the master station, determines whether the platform should be shut down based on the operating status of the platform equipment and the feedback data from various sensors in the system. When a platform shutdown is detected, execute S2; If it is determined that no platform shutdown has occurred, execute S4; S2. The central control system, acting as the master station, continues to determine whether the platform-induced shutdown is a production shutdown or an air pollution shutdown. When the gas is shut down, the central control system, as the master station, transmits the power-off signal of all electric heating to the multi-master station communication coordinator via RS-485 communication. Then, through the communication module and smart switch, it automatically disconnects all self-regulating electric heating tapes on the gas shutdown platform and executes S3. When production is determined to be shut down, the central control system, as the master station, transmits the signal to activate all electric heating cables to the multi-master station communication coordinator via RS-485 communication. Then, through the communication module and smart switch, it automatically activates all self-regulating electric heating cables on the production shutdown platform and executes S3. S3. The central control system, as a substation, transmits the production shutdown signal to the corresponding industrial control all-in-one computer via RS-485 communication. After receiving the signal, the industrial control all-in-one computer exits the original electric heat tracing control function and only performs data acquisition and display tasks. S4. Determine the control mode selected by the operator on the operator station; When the control mode is local control mode, the central control system, as the master station, transmits the signal for the electric heat tracing to be put into use or taken out of use to the multi-master station communication coordinator via RS-485 communication. The self-regulating electric heat tracing tape is controlled according to actual needs through the communication module and smart switch. When the control mode is remote control mode, the industrial control all-in-one computer communicates with the central control system as a substation via RS-485 to obtain control authority of the multi-level intelligent control system for electric heat tracing on the marine unmanned platform. The central control system, as the master station, exits the electric heat tracing control function and only performs data acquisition and display tasks. In manual control mode, the industrial control unit transmits the electric heat tracing activation or deactivation signal to the serial-to-Ethernet module via Ethernet communication. The multi-master communication coordinator, communication module, and smart switch control the electric heat tracing according to actual needs.

9. The multi-level intelligent control method for electric heat tracing on an unmanned offshore platform according to claim 8, characterized in that, Depending on the operating mode, the execution interval of the electric heat tracing activation signal command is as follows: In manual operation mode, the execution interval is 2 seconds; In automatic control mode, the execution interval is 40 seconds, and the total operating current of the multi-level intelligent control system for electric heat tracing on the offshore unmanned platform does not exceed 90% of the transformer's rated current. When the control mode is switched, the electric heat tracing system will remain in operation or off state for 60 seconds before executing the corresponding instructions according to the conditions of the latest control mode.

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