Offshore production platform zero-carbon energy supply control system and method

Abstract

The invention relates to the field of offshore production platform energy supply, and discloses an offshore production platform zero-carbon energy supply control system and method, the system comprises a controller, an energy storage subsystem connected with the controller, a differential pressure power generation subsystem and a wind electronic system, and the energy storage subsystem comprises Carnot battery energy storage and power type energy storage. Energy storage power generation-differential pressure power generation-wind power generation complementary zero-carbon energy supply for the offshore production platform can be constructed, diesel power generation of the platform is replaced, full-green power supply of the unmanned offshore carbon dioxide sealing platform is achieved, long-time and high-capacity energy storage is achieved through the energy storage subsystem, the intermittency of wind energy is thoroughly overcome, and the energy storage efficiency is improved. The continuity and stability of energy supply in an off-grid environment are ensured, and the reliability of renewable energy power supply of an offshore production platform is effectively enhanced.

Description

Technical Field

[0001] This invention relates to the field of energy supply for offshore production platforms, and more particularly to a zero-carbon energy supply control system and method for offshore production platforms. Background Technology

[0002] Offshore production platforms are large-scale marine engineering facilities and core devices for the development of marine oil and gas resources. They are generally built above or near offshore oil fields and are used for oil and gas extraction, processing, storage and export operations at sea.

[0003] To ensure the normal operation of offshore production platforms, diesel generators can be used for power supply. However, the high cost of fuel transportation and the difficulty of maintenance, coupled with serious environmental pollution, make it difficult to support the long-term stable operation of offshore production platforms. With the deepening of the global energy transition and the implementation of "dual-carbon" goals, the development and utilization of renewable energy sources such as wind and solar power are increasingly becoming a focus of attention. However, the inherent intermittency and volatility of these energy sources pose a severe challenge to their stable application in offshore platform power supply scenarios. Therefore, it is particularly urgent to construct a stable, reliable, efficient, and zero-carbon independent power supply system for offshore platform power supply scenarios. Summary of the Invention

[0004] This invention provides a zero-carbon energy supply control system and method for offshore production platforms, which addresses the shortcomings of low reliability of renewable energy power supply for offshore production platforms in related technologies and improves the reliability of renewable energy power supply for offshore production platforms.

[0005] In a first aspect, the present invention provides a zero-carbon energy supply control system for an offshore production platform. The system includes a controller, an energy storage subsystem connected to the controller, a differential pressure power generation system, and a wind power system. The energy storage subsystem, the differential pressure power generation system, and the wind power system are connected to the microgrid of the offshore production platform. The energy storage subsystem includes Carnot battery energy storage and power-type energy storage. The differential pressure power generation system is installed on the primary bypass of the incoming process gas main line; wherein, the differential pressure power generation system includes a heat exchanger, a turbine and a generator connected in sequence, and the inlet of the heat exchanger is connected to the incoming process gas main line; The Carnot battery energy storage is coupled to the differential voltage power generation system; wherein, the charging circuit of the Carnot battery energy storage includes a first low-temperature cold storage unit, the outlet of the first low-temperature cold storage unit is connected to the cold end inlet of the heat exchanger, and the cold end outlet of the heat exchanger is connected to the inlet of the first low-temperature cold storage unit; The controller is used to convert excess electrical energy from the wind power system and the differential pressure power generation system into heat energy when they are simultaneously powered, and store it in the Carnot battery energy storage; it is also used to stabilize the frequency of the microgrid to the target range using the power-type energy storage after all the wind turbines of the wind power system are disconnected, and to control the Carnot battery energy storage to heat the inlet medium of the differential pressure power generation system based on the stored heat energy, so as to increase the power generation of the differential pressure power generation system.

[0006] Optionally, the differential pressure generator system further includes a target valve disposed between the heat exchanger and the incoming process gas main line, which is used to be closed when the differential pressure generator set is under maintenance or the incoming process gas pressure is insufficient, and directly deliver the incoming process gas to the downstream of the differential pressure generator system; wherein, the target valve is a flow regulating valve or a shut-off valve.

[0007] Optionally, the differential pressure generating system further includes a second bypass, and the target valve includes a first valve and a second valve. The inlet of the first valve is connected to the incoming process gas main line, and the outlet of the first valve, the second valve, and the inlet of the heat exchanger are connected in sequence. The secondary bypass is equipped with a flow regulating valve or a shut-off valve, which is used to open when the temperature of the heat exchange medium from the first low-temperature cold storage unit does not reach the set temperature, so that the process gas bypasses the heat exchanger and directly enters the generator set of the differential pressure subsystem for power generation.

[0008] Optionally, the charging circuit of the Carnot battery energy storage includes a generator, an expander, a first cryogenic cold storage unit, a regenerator, a heat storage unit, a motor, a compressor, a heat storage tank, and a cold storage tank; The electric motor, the compressor, the heat accumulator, the regenerator, the expander, and the generator are connected in sequence; the expander, the first low-temperature cold accumulator, the regenerator, and the compressor are connected in sequence; the heat storage tank and the cold storage tank are connected to the first low-temperature cold accumulator.

[0009] Optionally, the discharge circuit of the Carnot battery energy storage includes an expander, a generator, a heat accumulator, a heater, a regenerator, a cooler, a second cryogenic cold accumulator, a motor and a compressor, a heat storage tank and a cold storage tank; The heat accumulator, the expander, and the generator are connected in sequence; the expander, the regenerator, the cooler, the second low-temperature cold storage, the compressor, and the motor are connected in sequence; the compressor, the regenerator, and the heat accumulator are connected in sequence; the regenerator, the heater, and the heat accumulator are connected in sequence; the heat storage tank and the cold storage tank are connected to the second low-temperature cold storage.

[0010] Optionally, the motor in the charging circuit and the generator in the discharging circuit of the Carnot battery energy storage are connected to the microgrid.

[0011] Optionally, the wind electronic system includes a wind turbine, a rectifier, a control module, and an unloading box. The zero-carbon energy supply control system of the offshore production platform also includes a wind power prediction subsystem. The wind power prediction subsystem and the wind electronic system achieve joint operation through data interaction and closed-loop control.

[0012] Secondly, the present invention provides a zero-carbon energy supply control method for offshore production platforms, applied to the system described in the first aspect above or any corresponding embodiment; the method includes: When the controller detects that the wind speed is within the design wind speed range and the process system pressure difference is within the design pressure difference range, it controls the wind power system and the pressure difference power generation system to supply power to the offshore production platform and converts the excess electrical energy into heat energy to be stored in the Carnot battery energy storage to maintain the voltage and frequency stability of the offshore production platform. When the controller detects that the wind speed exceeds the design wind speed range and the differential pressure of the process system is within the design differential pressure range, it controls the wind power system to stop supplying power to the offshore production platform. After all the wind turbines of the wind power system are disconnected, the power storage is used to stabilize the microgrid frequency of the offshore production platform to the target range. The controller then controls the differential pressure power generation system to continue supplying power to the offshore production platform, controls the Carnot battery energy storage to convert the stored thermal energy into electrical energy and supply it to the offshore production platform, and controls the Carnot battery energy storage to heat the inlet medium of the differential pressure power generation system based on the stored thermal energy, so as to increase the power generation of the differential pressure power generation system to the offshore production platform.

[0013] Optionally, after controlling the wind power system and the differential pressure power generation system to supply power to the offshore production platform, the method further includes: When the controller detects that the wind speed exceeds the design wind speed range and the pressure difference of the process system is not within the design pressure difference range, it controls the wind power system and the pressure difference power generation system to stop supplying power to the offshore production platform, and controls the Carnot battery energy storage to convert the stored thermal energy into electrical energy and supply power to the offshore production platform. After all the wind turbines of the wind power system are cut off, the power type energy storage is used to stabilize the microgrid frequency to the target range.

[0014] Optionally, controlling the Carnot battery energy storage to heat the inlet medium of the differential pressure power generation system based on the stored thermal energy includes: The controller monitors the temperature of the carbon dioxide output from the first cryogenic accumulator; When the controller determines that the temperature of the carbon dioxide output from the first low-temperature cold storage unit reaches the set temperature, it inputs the carbon dioxide into the heat exchanger to heat the inlet medium, and returns the carbon dioxide output from the heat exchanger to the first low-temperature cold storage unit for heating. After the controller monitors the temperature of the carbon dioxide output from the first cryogenic cold storage unit, the method further includes: When the controller determines that the temperature of the carbon dioxide output from the first cryogenic cold storage unit has not reached the set temperature, it controls the inlet medium to bypass the heat exchanger and enter the generator of the differential pressure power generation system to generate electricity.

[0015] The zero-carbon energy supply control system for offshore production platforms generates electricity based on the platform's power demand. It utilizes a terminal remote intelligent control system to call upon Carnot battery energy storage, differential pressure power generation system, and wind power power generation system to achieve comprehensive real-time regulation. The platform's power consumption is determined in real time based on the platform's power load.

[0016] The zero-carbon energy supply control system for offshore production platforms adopts an isolated grid operation mode and is remotely controlled by a terminal intelligent control system using satellite or microwave communication modules.

[0017] The zero-carbon energy supply control system for offshore production platforms lacks the inertia and voltage regulation capabilities of traditional large power grids due to the independent power supply system consisting only of wind turbines and differential pressure generators. Wind turbines (especially direct-drive types) have low inertia, and differential pressure generators also have limited inertia; both struggle to respond quickly to sudden changes in frequency and voltage (such as rapid load increases and decreases). Therefore, the energy storage configuration for the zero-carbon energy supply control system of offshore production platforms consists of supercapacitor energy storage and Carnot battery energy storage. Supercapacitor energy storage handles high-frequency, short-term, high-power disturbances to meet the transient stability requirements of the power grid. Carnot battery energy storage handles low-frequency, long-term power balance. The supercapacitor energy storage capacity is determined based on the frequency regulation requirements of the power grid stability analysis. The Carnot battery energy storage capacity is determined based on the power load and wind resources. If the energy storage system is deployed on an offshore platform and the required power storage capacity is within 1MW, double-layer supercapacitors are recommended; if it exceeds this capacity, hybrid supercapacitors are recommended.

[0018] Carnot battery energy storage uses a Carnot carbon dioxide battery based on the Brayton cycle, specifically including a Carnot battery charging circuit and a Carnot battery discharging circuit. The Carnot battery charging circuit includes an expander, a cryogenic accumulator, a regenerator, a heat accumulator, and a compressor. When wind power is sufficient, excess electricity drives the compressor, which is connected to the heat accumulator. The compressor delivers compressed, high-temperature, high-pressure carbon dioxide to the heat accumulator for heat exchange, storing the heat. The heat accumulator is connected to the regenerator; the carbon dioxide at the heat accumulator outlet enters the regenerator to heat the compressor inlet gas. The regenerator is connected to the expander; the gas enters the expander and expands, then transfers its cooling capacity to the heat exchange medium flowing from the heat storage tank in the cryogenic accumulator. The gas then enters the regenerator, where it returns to its initial state before recirculating. The heat storage tank is connected to the cryogenic accumulator; the heat exchange medium flowing from the heat storage tank is cooled after passing through the cryogenic accumulator before entering the cold storage tank to store its cooling capacity. The Carnot battery discharge circuit includes a heat accumulator, heater, expander, regenerator, cooler, cryogenic cold storage unit, and compressor. The heat accumulator is connected to the expander. Carbon dioxide absorbs heat in the heat accumulator, becoming a high-temperature, high-pressure gas, which then enters the expander to perform work. The electricity generated by the expander is fed into the microgrid. The gas exiting the expander undergoes three stages of cooling: regenerator, cooler, and cryogenic cold storage unit, before entering the compressor for compression. The cryogenic heat exchange medium in the cold storage tank enters the cryogenic cold storage unit and exchanges heat with the incoming flow in the cooler to achieve this stage of temperature drop. The carbon dioxide from the compressor passes through the regenerator and then enters the heat accumulator, repeating this process.

[0019] Carnot battery energy storage is a closed-loop Carnot battery energy storage system that does not require an external heat source and uses supercritical carbon dioxide as the working fluid. Compared with Rankine-type Carnot batteries that utilize ocean thermal energy and other types of physical energy storage, it is not limited by application scenarios and has a compact structure and small footprint, making it suitable for offshore platform environments.

[0020] The natural gas differential pressure power generation system is installed on the primary bypass of the incoming process gas main line. The bypass is equipped with flow regulating valves and / or shut-off valves, allowing the differential pressure generator to bypass the power generation system and directly supply the gas to the downstream system when the process gas pressure is insufficient during maintenance or repair. Secondary bypasses are installed at the inlet and outlet of the heat exchanger on the primary bypass. These bypasses are equipped with flow regulating valves and / or shut-off valves to allow the process gas to bypass the heat exchanger and directly enter the expander differential pressure power generation stage when the temperature of the heat exchange medium exiting the cryogenic accumulator does not meet the set temperature requirement.

[0021] The differential pressure power generation system has a micron-level solid particle filter installed after the shut-off valve on the inlet side pipeline.

[0022] The Carnot battery energy storage is coupled with the natural gas differential pressure generator system. A heat exchanger is installed in the first-stage bypass before the differential pressure generator system. The outlet of the low-temperature accumulator is connected to the cold end inlet of the heat exchanger, and the cold end outlet of the heat exchanger is connected to the inlet of the low-temperature accumulator. The process gas flow is connected to the hot end inlet of the heat exchanger, and the hot end outlet of the heat exchanger is connected to the inlet of the differential pressure generator set. The natural gas at the inlet of the differential pressure generator set is heated by the heat exchanger, and the power generation of the differential pressure generator set is increased by using Carnot battery heat storage, thus realizing comprehensive energy utilization.

[0023] Carnot battery energy storage is activated only when equipment failure, maintenance, or natural disasters cause one or both of the wind power system and differential pressure power system to malfunction, resulting in production interruption.

[0024] Furthermore, in addition to wind turbines, rectifiers, controllers, and unloading boxes, the wind power prediction system also includes a wind power forecasting system. The wind power forecasting system and the wind turbine generators operate jointly through data interaction and closed-loop control: the forecasting system continuously receives numerical weather forecasts and real-time wind turbine operating data, generates power forecast curves for the next 15 minutes to several days using physical and intelligent algorithms, and simultaneously uploads them to the power grid dispatch center and the wind farm's central control system; the wind farm dynamically adjusts the generator's operating status based on the ultra-short-term forecast results, proactively responds to wind speed changes to smooth power fluctuations, and participates in electricity market transactions and formulates operation and maintenance plans based on short-term forecasts, ultimately forming a collaborative operation mode of "forecasting-reporting-dispatch-control-feedback" to jointly ensure the adjustability and controllability of wind power and the stability of the power grid.

[0025] Furthermore, the low-temperature heat storage device in the Carnot battery energy storage is a three-flow heat exchanger.

[0026] Furthermore, the fluid heat storage medium used in the Carnot battery system is solar salt.

[0027] Furthermore, the heat exchanger on the primary bypass of the differential pressure generator system is a two-stream heat exchanger, which is a plate-fin heat exchanger.

[0028] The zero-carbon energy supply control system and method for offshore production platforms provided by this invention can replace traditional diesel generators and achieve a fully green electricity supply for offshore carbon dioxide storage platforms. The system includes a controller, an energy storage subsystem connected to the controller, a differential pressure power generation system, and a wind power system. The energy storage subsystem includes Carnot battery energy storage and power-type energy storage. When the controller detects that the wind speed is within the design wind speed range and the process system differential pressure is within the design differential pressure range, it controls the wind power system and the differential pressure power generation system to supply power to the offshore production platform and converts excess electrical energy into heat energy for storage in the Carnot battery energy storage. When the controller detects that the wind speed exceeds the design wind speed range and the process system differential pressure is within the design differential pressure range, it controls the wind power system to stop supplying power to the offshore production platform. After all the wind turbines in the wind power system are disconnected, power-type energy storage is used to stabilize the microgrid frequency of the offshore production platform to above 49Hz. The controller also controls the differential pressure power generation system to continue supplying power to the offshore production platform, controls the Carnot battery energy storage to convert stored thermal energy into electrical energy and supply power to the offshore production platform, and controls the Carnot battery energy storage to heat the inlet medium of the differential pressure power generation system based on stored thermal energy, thereby increasing the power generation of the differential pressure power generation system to the offshore production platform. This invention can construct a complementary zero-carbon energy supply system for the offshore production platform, combining Carnot battery energy storage power generation, differential pressure power generation, and wind power generation, replacing the platform's diesel power generation, and achieving a fully green electricity supply for the unmanned offshore carbon dioxide storage platform. It innovatively integrates Carnot battery energy storage with the differential pressure power generation system, utilizing the heat release from the Carnot battery to increase the inlet working fluid temperature of the differential pressure power generation system, thereby significantly improving its power generation efficiency and realizing the cascade and efficient utilization of energy within the system. By using Carnot battery energy storage to achieve long-term, large-capacity energy storage, the intermittency of wind power is completely overcome, ensuring the continuity and stability of energy supply in off-grid environments, and providing high reliability of renewable energy power supply for offshore production platforms. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in this invention or related technologies, the accompanying drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of a zero-carbon energy supply control system for an offshore production platform, provided in an embodiment of the present invention. Figure 2 A flowchart of a zero-carbon energy supply control method for an offshore production platform provided in an embodiment of the present invention; Figure 3 This is a schematic diagram of the structure of a computer device provided in an embodiment of the present invention. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0032] The following is combined with Figure 1 This invention describes a zero-carbon energy supply control system for offshore production platforms.

[0033] like Figure 1 As shown, this embodiment proposes a zero-carbon energy supply control system for an offshore production platform. The system includes a controller, an energy storage subsystem connected to the controller, a differential pressure power generation system, and a wind power system. The energy storage subsystem, differential pressure power generation system, and wind power system are connected to the microgrid of the offshore production platform. The energy storage subsystem includes Carnot battery energy storage and power-type energy storage. The differential pressure power generation system is installed on the primary bypass of the incoming process gas main line; the differential pressure power generation system includes a heat exchanger, a turbine and a generator connected in sequence, and the inlet of the heat exchanger is connected to the incoming process gas main line; The Carnot battery energy storage is coupled with a differential voltage power generation system; wherein, the charging circuit of the Carnot battery energy storage includes a first low-temperature accumulator, the outlet of the first low-temperature accumulator is connected to the cold end inlet of the heat exchanger, and the cold end outlet of the heat exchanger is connected to the inlet of the first low-temperature accumulator. The controller is used to convert excess electrical energy from the wind power system and the differential voltage power generation system into heat energy when they are simultaneously powered, and store it in the Carnot battery energy storage. It is also used to stabilize the microgrid frequency to a target range using power-type energy storage after all the wind turbines in the wind power system are disconnected, and to control the Carnot battery energy storage to heat the inlet medium of the differential voltage power generation system based on the stored heat energy, thereby increasing the power generation of the differential voltage power generation system. The target range can be above 49Hz.

[0034] The differential pressure generator system also includes a target valve located between the heat exchanger and the main inlet process gas line. This target valve is used to close when the differential pressure generator is under maintenance or when the inlet process gas pressure is insufficient, directly delivering the inlet process gas to the downstream of the differential pressure generator system. The target valve is either a flow regulating valve or a shut-off valve.

[0035] The differential pressure generator system also includes a second bypass. The target valve includes a first valve and a second valve. The inlet of the first valve is connected to the main flow of the process gas. The outlet of the first valve, the second valve, and the inlet of the heat exchanger are connected in sequence. The secondary bypass is equipped with a flow regulating valve or a shut-off valve, which is used to open when the temperature of the heat exchange medium from the first low-temperature cold storage unit does not reach the set temperature, so that the process gas bypasses the heat exchanger and directly enters the generator set of the differential pressure subsystem for power generation.

[0036] The charging circuit of the Carnot battery energy storage includes a generator, an expander, a first cryogenic accumulator, a regenerator, a heat accumulator, a motor, a compressor, a heat storage tank, and a cold storage tank; The electric motor, compressor, heat accumulator, regenerator, expander, and generator are connected in sequence; the expander, first low-temperature cold accumulator, regenerator, and compressor are connected in sequence; the heat storage tank and cold storage tank are connected to the first low-temperature cold accumulator.

[0037] The discharge circuit of the Carnot battery energy storage includes an expander, generator, accumulator, heater, regenerator, cooler, second cryogenic accumulator, motor and compressor, heat storage tank and cold storage tank; The heat accumulator, expander, and generator are connected in sequence; the expander, regenerator, cooler, second low-temperature cold accumulator, compressor, and motor are connected in sequence; the compressor, regenerator, and heat accumulator are connected in sequence; the regenerator, heater, and heat accumulator are connected in sequence; the heat storage tank and cold storage tank are connected to the second low-temperature cold accumulator.

[0038] The motor in the charging circuit and the generator in the discharging circuit of the Carnot battery energy storage are connected to the microgrid.

[0039] The wind power system includes a wind turbine, rectifier, control module and unloading box. The zero-carbon energy supply control system of offshore production platform also includes a wind power prediction subsystem. The wind power prediction subsystem and the wind power system achieve joint operation through data interaction and closed-loop control.

[0040] It should be noted that the power generation of the zero-carbon energy supply control system of the offshore production platform is determined in real time based on the platform's power demand by using the terminal remote intelligent control system to call upon the Carnot battery energy storage, differential pressure power generation system and wind power power generation system.

[0041] The zero-carbon energy supply control system for offshore production platforms adopts an isolated grid operation mode and is remotely controlled by a terminal intelligent control system using satellite or microwave communication modules.

[0042] The zero-carbon energy supply control system for offshore production platforms lacks the inertia and voltage regulation capabilities of traditional large power grids due to the independent power supply system consisting only of wind turbines and differential pressure generators. Wind turbines (especially direct-drive types) have low inertia, and differential pressure generators also have limited inertia; both struggle to respond quickly to sudden changes in frequency and voltage (such as rapid load increases and decreases). Therefore, the energy storage configuration for the zero-carbon energy supply control system of offshore production platforms consists of supercapacitor energy storage and Carnot battery energy storage. Supercapacitor energy storage handles high-frequency, short-term, high-power disturbances to meet the transient stability requirements of the power grid. Carnot battery energy storage handles low-frequency, long-term power balance. The supercapacitor energy storage capacity is determined based on the frequency regulation requirements of the power grid stability analysis. The Carnot battery energy storage capacity is determined based on the power load and wind resources. If the energy storage system is deployed on an offshore platform and the required power storage capacity is within 1MW, double-layer supercapacitors are recommended; if it exceeds this capacity, hybrid supercapacitors are recommended.

[0043] Carnot battery energy storage uses a Carnot carbon dioxide battery based on the Brayton cycle, specifically including a Carnot battery charging circuit and a Carnot battery discharging circuit. The Carnot battery charging circuit includes an expander, a cryogenic accumulator, a regenerator, a heat accumulator, and a compressor. When wind power is sufficient, excess electricity drives the compressor, which is connected to the heat accumulator. The compressor delivers compressed, high-temperature, high-pressure carbon dioxide to the heat accumulator for heat exchange, storing the heat. The heat accumulator is connected to the regenerator; the carbon dioxide at the heat accumulator outlet enters the regenerator to heat the compressor inlet gas. The regenerator is connected to the expander; the gas enters the expander and expands, then transfers its cooling capacity to the heat exchange medium flowing from the heat storage tank in the cryogenic accumulator. The gas then enters the regenerator, where it returns to its initial state before recirculating. The heat storage tank is connected to the cryogenic accumulator; the heat exchange medium flowing from the heat storage tank is cooled after passing through the cryogenic accumulator before entering the cold storage tank to store its cooling capacity. The Carnot battery discharge circuit includes a heat accumulator, heater, expander, regenerator, cooler, cryogenic cold storage unit, and compressor. The heat accumulator is connected to the expander. Carbon dioxide absorbs heat in the heat accumulator, becoming a high-temperature, high-pressure gas, which then enters the expander to perform work. The electricity generated by the expander is fed into the microgrid. The gas exiting the expander undergoes three stages of cooling: regenerator, cooler, and cryogenic cold storage unit, before entering the compressor for compression. The cryogenic heat exchange medium in the cold storage tank enters the cryogenic cold storage unit and exchanges heat with the incoming flow in the cooler to achieve this stage of temperature drop. The carbon dioxide from the compressor passes through the regenerator and then enters the heat accumulator, repeating this process.

[0044] Carnot battery energy storage is a closed-loop Carnot battery energy storage system that does not require an external heat source and uses supercritical carbon dioxide as the working fluid. Compared with Rankine-type Carnot batteries that utilize ocean thermal energy and other types of physical energy storage, it is not limited by application scenarios and has a compact structure and small footprint, making it suitable for offshore platform environments.

[0045] The natural gas differential pressure power generation system is installed on the primary bypass of the incoming process gas main line. The bypass is equipped with flow regulating valves and / or shut-off valves, allowing the differential pressure generator to bypass the power generation system and directly supply the gas to the downstream system when the process gas pressure is insufficient during maintenance or repair. Secondary bypasses are installed at the inlet and outlet of the heat exchanger on the primary bypass. These bypasses are equipped with flow regulating valves and / or shut-off valves to allow the process gas to bypass the heat exchanger and directly enter the expander differential pressure power generation stage when the temperature of the heat exchange medium exiting the cryogenic accumulator does not meet the set temperature requirement.

[0046] The differential pressure power generation system has a micron-level solid particle filter installed after the shut-off valve on the inlet side pipeline.

[0047] The Carnot battery energy storage is coupled with the natural gas differential pressure generator system. A heat exchanger is installed in the first-stage bypass before the differential pressure generator system. The outlet of the low-temperature accumulator is connected to the cold end inlet of the heat exchanger, and the cold end outlet of the heat exchanger is connected to the inlet of the low-temperature accumulator. The process gas flow is connected to the hot end inlet of the heat exchanger, and the hot end outlet of the heat exchanger is connected to the inlet of the differential pressure generator set. The natural gas at the inlet of the differential pressure generator set is heated by the heat exchanger, and the power generation of the differential pressure generator set is increased by using Carnot battery heat storage, thus realizing comprehensive energy utilization.

[0048] Carnot battery energy storage is activated only when equipment failure, maintenance, or natural disasters cause one or both of the wind power system and differential pressure power system to malfunction, resulting in production interruption.

[0049] Furthermore, in addition to wind turbines, rectifiers, controllers, and unloading boxes, the wind power prediction system also includes a wind power forecasting system. The wind power forecasting system and the wind turbine generators operate jointly through data interaction and closed-loop control: the forecasting system continuously receives numerical weather forecasts and real-time wind turbine operating data, generates power forecast curves for the next 15 minutes to several days using physical and intelligent algorithms, and simultaneously uploads them to the power grid dispatch center and the wind farm's central control system; the wind farm dynamically adjusts the generator's operating status based on the ultra-short-term forecast results, proactively responds to wind speed changes to smooth power fluctuations, and participates in electricity market transactions and formulates operation and maintenance plans based on short-term forecasts, ultimately forming a collaborative operation mode of "forecasting-reporting-dispatch-control-feedback" to jointly ensure the adjustability and controllability of wind power and the stability of the power grid.

[0050] Furthermore, the low-temperature heat storage device in the Carnot battery energy storage is a three-flow heat exchanger.

[0051] Furthermore, the fluid heat storage medium used in the Carnot battery system is solar salt.

[0052] Furthermore, the heat exchanger on the primary bypass of the differential pressure generator system is a two-stream heat exchanger, which is a plate-fin heat exchanger.

[0053] The zero-carbon energy supply control system for offshore production platforms proposed in this embodiment can construct a complementary zero-carbon energy supply system for offshore production platforms, consisting of Carnot battery energy storage power generation, differential pressure power generation, and wind power generation, replacing the platform's diesel power generation. This achieves a fully green electricity supply for unmanned offshore carbon dioxide storage platforms. It innovatively integrates Carnot battery energy storage with the differential pressure power generation system, utilizing the heat release from the Carnot battery to increase the inlet working fluid temperature of the differential pressure power generation system, thereby significantly improving its power generation efficiency and realizing the cascade and efficient utilization of energy within the system. Through Carnot battery energy storage, long-term, large-capacity energy storage is achieved, completely overcoming the intermittency of wind power and ensuring the continuity and stability of energy supply in off-grid environments, demonstrating a high degree of reliability in renewable energy power supply for offshore production platforms.

[0054] based on Figure 1 ,like Figure 2 As shown, this embodiment proposes a zero-carbon energy supply control method for offshore production platforms, which is applied to the aforementioned zero-carbon energy supply control system for offshore production platforms. The method includes the following steps: S101 When the controller detects that the wind speed is within the design wind speed range and the process system pressure difference is within the design pressure difference range, it controls the wind power system and the pressure difference power generation system to supply power to the offshore production platform and converts the excess electrical energy into heat energy to be stored in the Carnot battery energy storage to maintain the voltage and frequency stability of the offshore production platform.

[0055] like Figure 2 The zero-carbon energy supply control system for offshore production platforms shown includes a controller, an energy storage subsystem, a differential pressure power generation system, and a wind power system. The energy storage subsystem includes Carnot battery energy storage. The controller connects to the energy storage subsystem, the differential pressure power generation system, and the wind power system.

[0056] It should be noted that floating wind turbines can be deployed near offshore production platforms. These turbines can be connected to the platform's microgrid via a network of dynamic and static submarine cables. However, since the independent power supply system for an offshore platform, consisting only of wind turbines and a differential voltage generator system, lacks the inertia and voltage regulation capabilities of a large power grid, and both wind turbines (especially direct-drive types) have low inertia and differential voltage generator systems have limited inertia, it is difficult for both to quickly respond to sudden changes in frequency and voltage (such as sudden increases or decreases in load). Therefore, this embodiment configures a supercapacitor energy storage subsystem for rapid response to sudden changes in frequency and voltage.

[0057] Specifically, Carnot battery energy storage is a closed-loop Carnot battery energy storage system that does not require an external heat source and uses supercritical carbon dioxide as the working fluid. Compared with Rankine-type Carnot batteries that utilize ocean thermal energy and other types of physical energy storage, it is not limited by application scenarios and has a compact structure and small footprint, making it suitable for offshore platform environments.

[0058] like Figure 2As shown, Carnot battery energy storage can utilize a carbon dioxide Carnot battery based on the Brayton cycle. The Carnot battery energy storage includes a Carnot battery charging circuit and a Carnot battery discharging circuit. The Carnot battery charging circuit includes an expander, a cryogenic accumulator, a regenerator, a heat accumulator, and a compressor. When wind power is sufficient, excess electricity drives the compressor. The compressor is connected to the heat accumulator, sending the compressed, high-temperature, high-pressure carbon dioxide into the heat accumulator for heat exchange, storing the heat. The heat accumulator is connected to the regenerator; the carbon dioxide at the heat accumulator outlet enters the regenerator to heat the compressor inlet gas. The regenerator is connected to the expander; the gas enters the expander and expands, then transfers its cooling capacity to the heat exchange medium flowing from the heat storage tank in the cryogenic accumulator. The gas then returns to its initial state in the regenerator and the cycle repeats. The heat storage tank is connected to the cryogenic accumulator; the heat exchange medium flowing from the heat storage tank is cooled after passing through the cryogenic accumulator and then enters the cryogenic accumulator to store its cooling capacity. The Carnot battery discharge circuit includes a heat accumulator, heater, expander, regenerator, cooler, cryogenic cold storage unit, and compressor. The heat accumulator is connected to the expander. Carbon dioxide absorbs heat in the heat accumulator, becoming a high-temperature, high-pressure gas, which then enters the expander to perform work. The electricity generated by the expander is fed into the microgrid. The gas exiting the expander undergoes three stages of cooling: regenerator, cooler, and cryogenic cold storage unit, before entering the compressor for compression. The cryogenic heat exchange medium in the cold storage tank enters the cryogenic cold storage unit and exchanges heat with the incoming flow in the cooler to achieve this stage of temperature drop. The carbon dioxide from the compressor passes through the regenerator and then enters the heat accumulator, repeating this process.

[0059] like Figure 2 As shown, a natural gas differential pressure power generation system can include a differential pressure power generation unit. The differential pressure power generation unit includes a shut-off valve, a flow control valve, a pressure reducing valve, a 3-to-2 pressure transmitter, a particulate filter, an expander, a generator, and a grid connection system. High-pressure natural gas extracted from the wellhead first passes through the shut-off valve, then enters the flow control valve to regulate the gas flow, and then enters the expander through the expander inlet for expansion and pressure reduction, simultaneously driving the generator to generate electricity. The generated electricity is then fed into the microgrid after power quality adjustment via the grid connection system and through the system's transformer. The generator can be a synchronous or asynchronous generator. The natural gas differential pressure power generation system is installed on the primary bypass of the incoming process gas main pipeline. The bypass is equipped with a flow control valve and / or a shut-off valve, thereby enabling the differential pressure generator unit to be maintained and repaired, and for the process gas to be directly transported downstream without passing through the differential pressure power generation system when the incoming process gas pressure is insufficient. A secondary bypass is installed at the inlet and outlet of the heat exchanger of the primary bypass. The bypass is equipped with a flow regulating valve and / or a shut-off valve to allow the process gas to bypass the heat exchanger and directly enter the expansion differential pressure power generation stage when the temperature of the heat exchange medium coming out of the low temperature accumulator does not meet the set temperature requirement.

[0060] Optionally, the differential pressure generator system may be equipped with a micron-level solid particle filter after the shut-off valve on the inlet side pipeline.

[0061] Optionally, the wind electronic system includes a wind turbine, rectifier, control module and unloading box. The zero-carbon energy supply control system of the offshore production platform also includes a wind power prediction subsystem. The wind power prediction subsystem and the wind electronic system achieve joint operation through data interaction and closed-loop control.

[0062] like Figure 2 As shown, the wind power system can include a wind turbine, rectifier, controller, and unloading box. The zero-carbon energy supply control system for offshore production platforms can also include a wind power prediction system. The wind power prediction system and the wind power system operate jointly through data interaction and closed-loop control. The wind power prediction system continuously receives numerical weather forecasts and real-time wind turbine operation data, generates power prediction curves for the next 15 minutes to several days using physical and intelligent algorithms, and simultaneously uploads them to the power grid dispatch center and the wind farm's central control system. The wind farm dynamically adjusts the unit's operating status based on the ultra-short-term prediction results, proactively responds to wind speed changes to smooth power fluctuations, and participates in electricity market transactions and formulates operation and maintenance plans based on short-term predictions. Ultimately, this forms a collaborative operation mode of "prediction-reporting-dispatch-control-feedback," jointly ensuring the adjustability and controllability of wind power and the stability of the power grid. The wind turbine is used to convert wind energy into electrical energy, serving as a supplementary power source for the system. The generated electricity is prioritized for supplying user loads, and excess electricity drives the charging of the Carnot battery energy storage unit.

[0063] Specifically, the controller can monitor the wind speed and process system pressure differential of the offshore production platform. When it is determined that the wind speed is within the design wind speed range and the process system pressure differential is within the design pressure differential range, the controller controls the wind power system and the pressure differential power generation system to generate electricity and supply power to the offshore production platform.

[0064] The wind speed range can be set from the cut-in wind speed to the cut-out wind speed of the wind electronic system. Both the cut-in and cut-out wind speeds can be set by technicians based on actual conditions. Similarly, the differential pressure range can also be set by technicians based on actual conditions. When the wind speed consistently exceeds the rated wind speed of the wind electronic system, the output power of the wind electronic system far exceeds the user's current total load demand. In this mode, the wind electronic system and the differential pressure power generation system act as the main power sources. After meeting the platform's load power requirements, there is still surplus energy. The system can then use this excess energy to drive the Carnot battery energy storage for thermal storage. The Carnot battery energy storage is responsible for maintaining the voltage and frequency stability of the microgrid and smoothing out large power fluctuations in the wind electronic system.

[0065] S102. When the controller detects that the wind speed exceeds the design wind speed range and the process system differential pressure is within the design differential pressure range, it controls the wind power system to stop supplying power to the offshore production platform. After all the wind turbines of the wind power system are switched off, power storage is used to stabilize the microgrid frequency of the offshore production platform to the target range. The differential pressure power generation system is controlled to continue supplying power to the offshore production platform. The Carnot battery energy storage is controlled to convert the stored thermal energy into electrical energy and supply power to the offshore production platform. The Carnot battery energy storage is also controlled to heat the inlet medium of the differential pressure power generation system based on the stored thermal energy to increase the power generation of the differential pressure power generation system to the offshore production platform.

[0066] Specifically, when the controller determines that the wind speed is not within the design wind speed range and the differential pressure of the process system is within the set differential pressure range, it can control the wind power system to prohibit power supply to the offshore production platform, control the differential pressure power generation system and the energy storage subsystem to supply power to the offshore production platform, and control the energy storage subsystem to heat the inlet medium of the differential pressure power generation system based on the stored thermal energy, so as to increase the power generation of the differential pressure power generation system to the offshore production platform.

[0067] It should be noted that when the wind speed is determined to be outside the design wind speed range, this embodiment can momentarily disconnect the wind power system. Power storage acts as a means to prevent grid frequency drops and works in conjunction with the Carnot battery's long-term energy storage to ensure stable system power supply. The Carnot battery energy storage and the differential voltage power generation system work together to supply power to the load. In this mode, the power storage plays a crucial regulatory role, responding quickly to compensate for instantaneous power differences between various power sources and the load, damping oscillations, and ensuring power quality and system stability.

[0068] Optionally, in other zero-carbon energy supply control methods for offshore production platforms proposed in this embodiment, after controlling the wind power system and differential pressure power generation system to supply power to the offshore production platform, the method further includes: When the controller detects that the wind speed exceeds the design wind speed range and the process system pressure difference is not within the design pressure difference range, it controls the wind power system and the pressure difference power generation system to stop supplying power to the offshore production platform, and controls the Carnot battery energy storage to convert the stored thermal energy into electrical energy and supply power to the offshore production platform. After all the wind turbines of the wind power system are cut off, power-type energy storage is used to stabilize the microgrid frequency to the target range.

[0069] It should be noted that when the wind power system has no output and the differential voltage resources are insufficient, the load power can be entirely supplied by the Carnot battery energy storage. In this case, the Carnot battery energy storage becomes the cornerstone of the system's stability. The Carnot battery energy storage actively establishes and supports the voltage and frequency of the microgrid, providing crucial virtual inertia to cope with load changes and ensure the continuity and reliability of the platform's power supply.

[0070] Optionally, the above-mentioned control of the Carnot battery energy storage to heat the inlet medium of the differential pressure power generation system based on the stored thermal energy includes: The controller monitors the temperature of the carbon dioxide output from the first cryogenic accumulator; When the controller determines that the temperature of the carbon dioxide output from the first cryogenic accumulator has reached the set temperature, it inputs the carbon dioxide into the heat exchanger to heat the inlet medium, and returns the carbon dioxide output from the heat exchanger to the first cryogenic accumulator for further heating.

[0071] After the controller monitors the temperature of the carbon dioxide output from the first cryogenic accumulator, the method further includes: When the controller determines that the temperature of the carbon dioxide output from the first cryogenic accumulator has not reached the set temperature, it controls the inlet medium to bypass the heat exchanger and enter the generator of the differential pressure power generation system to generate electricity.

[0072] Specifically, the Carnot battery energy storage is coupled with the natural gas differential pressure generator system. A heat exchanger is installed in the first-stage bypass before the natural gas differential pressure generator system. The outlet of the low-temperature accumulator in the charging circuit of the Carnot battery energy storage is connected to the cold end inlet of the heat exchanger, and the cold end outlet of the heat exchanger is connected to the inlet of the low-temperature accumulator. The process gas flow is connected to the hot end inlet of the heat exchanger, and the hot end outlet of the heat exchanger is connected to the inlet of the differential pressure generator set. The natural gas at the inlet of the differential pressure generator set is heated by the heat exchanger, and the heat stored in the Carnot battery energy storage is used to increase the power generation of the differential pressure generator set, thereby realizing comprehensive energy utilization.

[0073] Furthermore, the low-temperature heat storage device in the Carnot battery energy storage is a three-flow heat exchanger.

[0074] Furthermore, the fluid thermal storage medium used in Carnot battery energy storage is solar salt.

[0075] Furthermore, the heat exchanger on the primary bypass of the differential pressure generator system is a two-stream heat exchanger, which is a plate-fin heat exchanger.

[0076] Specifically, in this embodiment, the zero-carbon energy supply control system for offshore production platforms can adopt an isolated grid operation mode, which is controlled by a remote intelligent control system using a terminal with a satellite or microwave communication module.

[0077] It should be noted that this embodiment enables a zero-carbon energy supply for offshore production platforms through a complementary system of Carnot batteries, differential pressure power generation, and wind power generation, replacing the platform's diesel generator system and achieving a fully green electricity supply for unmanned offshore carbon dioxide storage platforms. This embodiment's power supply method features high reliability and off-grid operation. The Carnot batteries enable long-term, large-capacity energy storage, completely overcoming the intermittency of wind power and ensuring the continuity and stability of energy supply in an off-grid environment. Furthermore, the Carnot batteries can provide heat energy to the differential pressure power generation system, thereby increasing the system's power output and achieving cascaded energy utilization. The power output of this embodiment can be adjusted according to the offshore platform's electricity demand and the combined control of different power generation units.

[0078] This embodiment of the zero-carbon energy supply control system for offshore production platforms is a highly reliable off-grid zero-carbon energy supply system capable of replacing traditional diesel generators and achieving a fully green electricity supply for offshore carbon dioxide storage platforms. The system deeply integrates Carnot batteries with a differential pressure power generation system, utilizing the heat release from the Carnot batteries to increase the inlet working fluid temperature of the differential pressure power generation system, thereby significantly improving its power generation efficiency and achieving cascaded and efficient utilization of energy within the system. Based on this, the system achieves long-term, large-capacity energy storage through Carnot batteries, fundamentally overcoming the intermittency problem of wind power. By configuring power-type energy storage, it solves the problem of sudden drops in grid frequency caused by instantaneous wind turbine disconnection, ensuring a continuous and stable energy supply in an off-grid environment. Simultaneously, the system can intelligently coordinate and regulate according to the platform's power demand and the characteristics of each power generation unit to achieve efficient energy supply. Furthermore, the differential pressure power generation system is equipped with a flexible switching mechanism, including bypass pipelines, ensuring uninterrupted operation during maintenance and direct access to downstream pipelines to guarantee normal oil and gas production activities, significantly improving the system's operational flexibility and reliability.

[0079] The zero-carbon energy supply control method for offshore production platforms proposed in this embodiment can be applied to zero-carbon energy supply control systems for offshore production platforms. When the wind speed is detected to be within the design wind speed range and the process system differential pressure is within the design differential pressure range, the wind power system and the differential pressure power generation system are controlled to supply power to the offshore production platform, and excess electrical energy is converted into heat energy and stored in the Carnot battery energy storage to maintain the voltage and frequency stability of the offshore production platform. When the controller detects that the wind speed exceeds the design wind speed range and the process system differential pressure is within the design differential pressure range, the wind power system is controlled to stop supplying power to the offshore production platform. After all the wind turbines of the wind power system are disconnected, power-type energy storage is used to stabilize the microgrid frequency of the offshore production platform to above 49Hz; the differential pressure power generation system is controlled to continue supplying power to the offshore production platform; the Carnot battery energy storage is controlled to convert the stored heat energy into electrical energy and supply power to the offshore production platform; and the Carnot battery energy storage is controlled to heat the inlet medium of the differential pressure power generation system based on the stored heat energy to increase the power generation of the differential pressure power generation system to the offshore production platform. This embodiment can construct a complementary zero-carbon energy supply system for offshore production platforms, consisting of Carnot battery energy storage, differential pressure power generation, and wind power generation, replacing the platform's diesel power generation. This enables a fully green electricity supply for unmanned offshore carbon dioxide storage platforms. Through Carnot battery energy storage, long-term, large-capacity energy storage is achieved, completely overcoming the intermittency of wind power and ensuring the continuity and stability of energy supply in off-grid environments. It also demonstrates a high degree of reliability in renewable energy power supply for offshore production platforms.

[0080] In this embodiment, the controller is presented in the form of a functional unit. Here, a unit refers to an ASIC (Application Specific Integrated Circuit) circuit, a processor and memory that execute one or more software or fixed programs, and / or other devices that can provide the above functions.

[0081] This invention also provides a computer device having the above-described features. Figure 3 The controller shown.

[0082] Please see Figure 3The present invention provides a schematic diagram of the structure of a computer device according to an optional embodiment. The computer device includes one or more processors 10, a memory 20, and interfaces for connecting the various components, including high-speed interfaces and low-speed interfaces. The various components are interconnected via different buses and can be mounted on a common motherboard or otherwise installed as needed. The processors can process instructions executed within the computer device, including instructions stored in or on memory to display graphical information of a GUI on an external input / output device (such as a display device coupled to the interface). In some optional embodiments, multiple processors and / or multiple buses can be used with multiple memories, if desired. Similarly, multiple computer devices can be connected, each providing some of the necessary operations (e.g., as a server array, a group of blade servers, or a multiprocessor system). Figure 3 Take a processor 10 as an example.

[0083] Processor 10 may be a central processing unit, a network processor, or a combination thereof. Processor 10 may further include a hardware chip. The hardware chip may be an application-specific integrated circuit (ASIC), a programmable logic device (PLD), or a combination thereof. The programmable logic device may be a complex programmable logic device (CAMP), a field-programmable gate array (FPGA), a general-purpose array logic (GDA), or any combination thereof.

[0084] The memory 20 stores instructions executable by at least one processor 10 to cause at least one processor 10 to perform the method shown in the above embodiments.

[0085] The memory 20 may include a program storage area and a data storage area. The program storage area may store the operating system and applications required for at least one function. The data storage area may store data created based on the use of the computer device. Furthermore, the memory 20 may include high-speed random access memory and may also include non-transitory memory, such as at least one disk storage device, flash memory device, or other non-transitory solid-state storage device. In some alternative embodiments, the memory 20 may optionally include memory remotely located relative to the processor 10, which can be connected to the computer device via a network. Examples of such networks include, but are not limited to, the Internet, intranets, local area networks, mobile communication networks, and combinations thereof.

[0086] Memory 20 may include volatile memory, such as random access memory. Memory may also include non-volatile memory, such as flash memory, hard disk, or solid-state drive. Memory 20 may also include combinations of the above types of memory.

[0087] The computer device also includes a communication interface 30 for communicating with other devices or communication networks.

[0088] This invention also provides a computer-readable storage medium. The methods described above according to embodiments of the invention can be implemented in hardware or firmware, or implemented as computer code that can be recorded on a storage medium, or implemented as computer code downloaded via a network and originally stored on a remote storage medium or a non-transitory machine-readable storage medium and then stored on a local storage medium. Thus, the methods described herein can be processed by software stored on a storage medium using a general-purpose computer, a dedicated processor, or programmable or dedicated hardware. The storage medium can be a magnetic disk, optical disk, read-only memory, random access memory, flash memory, hard disk, or solid-state drive, etc.; further, the storage medium can also include combinations of the above types of memory. It is understood that computers, processors, microprocessor controllers, or programmable hardware include storage components capable of storing or receiving software or computer code, which, when accessed and executed by the computer, processor, or hardware, implements the methods shown in the above embodiments.

[0089] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A zero-carbon energy supply control system for offshore production platforms, characterized in that, The system includes a controller, an energy storage subsystem connected to the controller, a differential pressure power generation system, and a wind power system. The energy storage subsystem, the differential pressure power generation system, and the wind power system are connected to the microgrid of the offshore production platform. The energy storage subsystem includes Carnot battery energy storage and power-type energy storage. The differential pressure power generation system is installed on the primary bypass of the incoming process gas main line; wherein, the differential pressure power generation system includes a heat exchanger, a turbine and a generator connected in sequence, and the inlet of the heat exchanger is connected to the incoming process gas main line; The Carnot battery energy storage is coupled to the differential voltage power generation system; wherein, the charging circuit of the Carnot battery energy storage includes a first low-temperature cold storage unit, the outlet of the first low-temperature cold storage unit is connected to the cold end inlet of the heat exchanger, and the cold end outlet of the heat exchanger is connected to the inlet of the first low-temperature cold storage unit; The controller is used to convert excess electrical energy from the wind power system and the differential pressure power generation system into heat energy when they are simultaneously powered, and store it in the Carnot battery energy storage; it is also used to stabilize the frequency of the microgrid to the target range using the power-type energy storage after all the wind turbines of the wind power system are disconnected, and to control the Carnot battery energy storage to heat the inlet medium of the differential pressure power generation system based on the stored heat energy, so as to increase the power generation of the differential pressure power generation system.

2. The method according to claim 1, characterized in that, The differential pressure generator system also includes a target valve located between the heat exchanger and the incoming process gas main line. This target valve is used to be closed when the differential pressure generator is under maintenance or when the incoming process gas pressure is insufficient, so that the incoming process gas can be directly delivered to the downstream of the differential pressure generator system. The target valve is a flow regulating valve or a shut-off valve.

3. The system according to claim 2, characterized in that, The differential pressure power generation system also includes a second bypass. The target valve includes a first valve and a second valve. The inlet of the first valve is connected to the incoming process gas main line. The outlet of the first valve, the second valve, and the inlet of the heat exchanger are connected in sequence. The secondary bypass is equipped with a flow regulating valve or a shut-off valve, which is used to open when the temperature of the heat exchange medium from the first low-temperature cold storage unit does not reach the set temperature, so that the process gas bypasses the heat exchanger and directly enters the generator set of the differential pressure subsystem for power generation.

4. The system according to claim 1, characterized in that, The charging circuit of the Carnot battery energy storage includes a generator, an expander, a first cryogenic accumulator, a regenerator, a heat accumulator, a motor, a compressor, a heat storage tank, and a cold storage tank. The electric motor, the compressor, the heat accumulator, the regenerator, the expander, and the generator are connected in sequence; the expander, the first low-temperature cold accumulator, the regenerator, and the compressor are connected in sequence; the heat storage tank and the cold storage tank are connected to the first low-temperature cold accumulator.

5. The system according to claim 1, characterized in that, The discharge circuit of the Carnot battery energy storage includes an expander, a generator, a heat accumulator, a heater, a regenerator, a cooler, a second low-temperature cold accumulator, a motor and a compressor, a heat storage tank and a cold storage tank; The heat accumulator, the expander, and the generator are connected in sequence; the expander, the regenerator, the cooler, the second low-temperature cold storage, the compressor, and the motor are connected in sequence; the compressor, the regenerator, and the heat accumulator are connected in sequence; the regenerator, the heater, and the heat accumulator are connected in sequence; the heat storage tank and the cold storage tank are connected to the second low-temperature cold storage.

6. The system according to claim 1, characterized in that, The motor in the charging circuit and the generator in the discharging circuit of the Carnot battery energy storage are connected to the microgrid.

7. The system according to claim 1, characterized in that, The wind power system includes a wind turbine, a rectifier, a control module, and an unloading box. The zero-carbon energy supply control system of the offshore production platform also includes a wind power prediction subsystem. The wind power prediction subsystem and the wind power system achieve joint operation through data interaction and closed-loop control.

8. A zero-carbon energy supply control method for offshore production platforms, characterized in that, The method is applied to the system according to any one of claims 1 to 7; the method comprises: When the controller detects that the wind speed is within the design wind speed range and the process system pressure difference is within the design pressure difference range, it controls the wind power system and the pressure difference power generation system to supply power to the offshore production platform and converts the excess electrical energy into heat energy to be stored in the Carnot battery energy storage to maintain the voltage and frequency stability of the offshore production platform. When the controller detects that the wind speed exceeds the design wind speed range and the differential pressure of the process system is within the design differential pressure range, it controls the wind power system to stop supplying power to the offshore production platform. After all the wind turbines of the wind power system are disconnected, the power storage is used to stabilize the microgrid frequency of the offshore production platform to the target range. The controller then controls the differential pressure power generation system to continue supplying power to the offshore production platform, controls the Carnot battery energy storage to convert the stored thermal energy into electrical energy and supply it to the offshore production platform, and controls the Carnot battery energy storage to heat the inlet medium of the differential pressure power generation system based on the stored thermal energy, so as to increase the power generation of the differential pressure power generation system to the offshore production platform.

9. The method according to claim 8, characterized in that, After controlling the wind power system and the differential pressure power generation system to supply power to the offshore production platform, the method further includes: When the controller detects that the wind speed exceeds the design wind speed range and the pressure difference of the process system is not within the design pressure difference range, it controls the wind power system and the pressure difference power generation system to stop supplying power to the offshore production platform, and controls the Carnot battery energy storage to convert the stored thermal energy into electrical energy and supply power to the offshore production platform. After all the wind turbines of the wind power system are cut off, the power type energy storage is used to stabilize the microgrid frequency to the target range.

10. The method according to claim 8 or 9, characterized in that, The control of the Carnot battery energy storage to heat the inlet medium of the differential pressure power generation system based on the stored thermal energy includes: The controller monitors the temperature of the carbon dioxide output from the first cryogenic accumulator; When the controller determines that the temperature of the carbon dioxide output from the first low-temperature cold storage unit reaches the set temperature, it inputs the carbon dioxide into the heat exchanger to heat the inlet medium, and returns the carbon dioxide output from the heat exchanger to the first low-temperature cold storage unit for heating. After the controller monitors the temperature of the carbon dioxide output from the first cryogenic cold storage unit, the method further includes: When the controller determines that the temperature of the carbon dioxide output from the first cryogenic cold storage unit has not reached the set temperature, it controls the inlet medium to bypass the heat exchanger and enter the generator of the differential pressure power generation system to generate electricity.

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