Distributed micro-grid power station system based on methanol fuel and control method thereof

Abstract

The invention relates to the technical field of power supply systems, in particular to a distributed micro-grid power station system based on methanol fuel and a control method thereof.The distributed micro-grid power station system comprises a plurality of methanol generator sets arranged in parallel and an intelligent energy storage system, and the methanol generator sets are used for supplying power to loads; the intelligent energy storage system and the methanol generator set are connected in parallel through a bus, and the micro-grid control system controls the intelligent energy storage system to store redundant electric energy when the power demand is in the valley; and controlling the intelligent energy storage system to release electric energy so as to balance load fluctuation in a power demand peak. Complementation is formed through the methanol generator set and the energy storage system, the methanol generator set provides steady-state power, the energy storage system bears transient power to compensate the sudden power increasing gap of the methanol generator set, and the problems that the power of the methanol generator set cannot keep up due to the fact that the instantaneous power demand of loads such as a drilling platform is too large, and the energy consumption is low are solved. And the impact load is difficult to deal with independently.

Description

Technical Field

[0001] The present invention relates to the field of new energy power supply technology, and specifically to a distributed microgrid power station system based on methanol fuel and a control method thereof. The system is particularly suitable for oilfield drilling platforms without mains power supply. Through the coordinated control of modular methanol generator sets and intelligent energy storage systems, efficient, low-carbon, and highly reliable independent power supply can be achieved. Background Art

[0002] Oilfields and mines are often located in remote areas, far from urban power supply centers. Long-distance power transmission results in significant energy losses, which not only affects the quality of power supply but also makes transmission line construction expensive and difficult, posing the risk of insufficient or unstable power supply.

[0003] Furthermore, oilfield and mine mining machinery, hoisting equipment, pumping units, and water injection equipment all generate significant load fluctuations during operation. These frequent load changes place stringent demands on the stability and regulation capabilities of the power supply system. If the power supply system fails to respond and adjust promptly, it can cause voltage fluctuations, frequency instability, and other issues, impacting normal equipment operation and even causing damage.

[0004] Oilfield and mine production operations are typically continuous. A power outage not only disrupts production schedules but can also lead to serious consequences such as equipment damage and safety accidents. For example, if underground ventilation equipment in a mine ceases to operate, air quality will deteriorate, posing a threat to miners' lives. If a power outage halts oil pipelines in an oilfield, this can lead to blockages and solidified oil.

[0005] Traditional oilfield and mine platforms often use diesel generators to power their platforms. However, diesel generators have the following problems: 1. High fuel costs: Diesel prices fluctuate greatly and show a long-term upward trend; 2. Severe emission pollution: Diesel engine CO2 emissions are as high as 500g / kWh, and nitrogen oxides (NOx) and particulate matter (PM) emissions exceed standards; 3. Poor load adaptability: Sudden load increases are frequent during drilling operations, and diesel generator sets are prone to efficiency degradation or even shutdown due to load fluctuations. 4. Complex maintenance: Failures in high-power diesel generator sets require complete shutdown for maintenance, impacting production continuity. Therefore, finding an economical, environmentally friendly, and stable power supply is crucial. Methanol, as a clean fuel, offers the advantages of low fuel costs and clean emissions. Methanol generators, using methanol as fuel, not only reduce operating costs but also carbon emissions, complying with environmental regulations. Furthermore, as a renewable energy source, methanol's use helps alleviate dependence on petroleum resources.

[0006] However, existing methanol power generation technology is unable to meet the sudden load demands in scenarios such as oil fields and mines, and cannot ensure the stability and reliability of power supply. Summary of the Invention

[0007] The present invention provides a distributed microgrid power station system based on methanol fuel and a control method thereof, so as to solve the technical problem of insufficient power supply stability of existing methanol generator sets.

[0008] The present invention is achieved by adopting the following technical solutions: A distributed microgrid power station system based on methanol fuel is used to supply power to the load of an oilfield drilling platform, and comprises a plurality of methanol generator sets arranged in parallel, a methanol tank, an intelligent energy storage system and a microgrid control system; the methanol generator set is used to supply power to the load, and the methanol generator set is a container-type structure, and the plurality of the methanol generator sets are connected in parallel via a busbar; the methanol tank supplies fuel to the methanol generator set and can meet the endurance requirements of the methanol generator set; the microgrid control system is communicatively connected with the methanol generator set and the intelligent energy storage system to dynamically adjust the number of operating methanol generator sets and the charging and discharging strategy of the intelligent energy storage system; the intelligent energy storage system is connected in parallel with the methanol generator set via a busbar; when power demand is low, the microgrid control system controls the intelligent energy storage system to store excess electricity; when power demand is peak, the intelligent energy storage system is controlled to release electricity to balance load fluctuations.

[0009] Intelligent energy storage systems absorb and store electricity during periods of low demand and release it during peak demand, stabilizing power supply and reducing the impact of load fluctuations on generator sets, thereby improving energy utilization and extending equipment life. Furthermore, reducing methanol consumption also reduces greenhouse gas emissions such as carbon dioxide, complying with environmental protection and sustainable development requirements.

[0010] The parallel operation of multiple methanol generator sets, coupled with an intelligent energy storage system, effectively addresses the large load fluctuations on oilfield drilling platforms. This is particularly true during sudden load events (defined as a sudden load event when any of the bus voltage, current, power, or frequency drops below 90% of its rated value for less than 1 second). The intelligent energy storage system quickly intervenes, providing instantaneous power compensation to smooth out the load fluctuations of the methanol generator sets, prevent voltage drops from triggering protection, and ensure stable and reliable power supply. The methanol generator sets and energy storage system complement each other: the energy storage system absorbs transient power (accepting at least 50% of the sudden load), while the methanol generator sets provide steady-state power (accepting the remaining sudden load and providing continuous power).

[0011] Methanol fuel is cheaper and less volatile than diesel, reducing overall operating costs. Methanol fuel also offers cleaner emissions, significantly lower CO2 emissions than diesel engines, and significantly reduced nitrogen oxide (NOx) and particulate matter (PM) emissions, meeting environmental protection requirements. Furthermore, the containerized structure of methanol generator sets facilitates transportation and installation, reducing deployment costs.

[0012] The microgrid control system enables dynamic load distribution, remote monitoring, and coordinated operation of the intelligent energy storage system across multiple methanol generators, improving overall system automation and management efficiency. The intelligent energy storage system stores excess energy during periods of low power demand and releases it during peak demand periods, balancing load fluctuations, avoiding resource waste and improving energy utilization. Parallel operation of multiple methanol generators ensures that failure of a single unit will not affect overall power supply, enhancing system redundancy and flexibility and ensuring production continuity.

[0013] The methanol generator set adopts a containerized structure with the advantages of standardized size and modular design, which facilitates transportation, lifting and on-site assembly, greatly shortening the deployment time. The containerized structure is sturdy and durable, and can provide good protection in various complex environments. At the same time, it supports the parallel use of multiple devices and can flexibly respond to power demands of different scales. In addition, this structural design allows for expansion or modification according to actual needs to meet the requirements of larger power loads that may arise in the future.

[0014] As a preferred technical solution of the present invention, the methanol generator set has a single-unit rated power of 200kW-500kW and incorporates a built-in methanol engine and an all-copper brushless excitation generator. With a single-unit rated power range of 200kW-500kW, the methanol generator set can meet the power needs of oilfield drilling platforms of varying sizes while ensuring system flexibility and scalability. Compared to traditional generators, the all-copper brushless excitation generator offers higher efficiency, lower maintenance costs, and a longer service life. The all-copper winding design improves electrical conductivity, while the brushless design reduces mechanical wear and enhances equipment reliability.

[0015] As a preferred technical solution of the present invention, the intelligent energy storage system has a storage capacity of 150-300 kWh and a DC voltage range of 1020-1489 V. This high capacity and wide voltage range enable the intelligent energy storage system to better adapt to the large load fluctuations of oilfield drilling platforms, ensuring stable operation under various operating conditions.

[0016] As a preferred technical solution of the present invention, the methanol engine has a compression ratio of (12-13): 1. A high compression ratio can significantly improve combustion efficiency, ensuring that the fuel is fully burned in the cylinder, thereby increasing the engine's power output and fuel economy.

[0017] As a preferred technical solution of the present invention, the exterior surface of the containerized structure of the methanol generator set is coated with a nano-hydrophobic coating and a thermal insulation coating, with the nano-hydrophobic coating applied to the upper surface of the thermal insulation coating; the interior of the containerized structure is provided with a sound-absorbing foam; and the methanol generator set has an integrated methanol storage tank. The nano-hydrophobic coating effectively prevents moisture intrusion and reduces equipment corrosion caused by humid environments, which is particularly important in environments such as mines and oil fields that may be exposed to harsh climates. The nano-hydrophobic coating also has a self-cleaning function, reducing dust and dirt adhesion, lowering maintenance costs and ensuring long-term stable operation of the equipment. The interior walls of the unit compartment are covered with sound-absorbing foam, which effectively absorbs and isolates noise generated by the methanol generator set during operation, minimizing its impact on the surrounding environment. The thermal insulation coating effectively isolates the internal environment from the effects of high or low temperatures, ensuring the methanol generator set can operate normally even in extreme weather conditions.

[0018] As a preferred technical solution of the present invention, the intelligent energy storage system includes a battery system and a PCS. The battery system includes battery cells and a BMS for controlling the battery cells. The PCS connects the battery system and the busbar to achieve bidirectional commutation.

[0019] As a preferred technical solution of the present invention, the battery cell is a lithium iron phosphate battery cell.

[0020] A control method for a distributed microgrid power station system based on methanol fuel, the control method comprising: The microgrid control system dynamically adjusts the number of methanol generator sets in operation and the charging and discharging strategy of the intelligent energy storage system based on historical load data and real-time bus voltage, current, power and frequency inputs; When any methanol generator set fails, the microgrid control system automatically switches to the backup methanol generator set and triggers the intelligent energy storage system for emergency power supply to ensure the continuity of load power supply; Monitor fuel consumption and equipment status through the terminal to achieve preventive maintenance. The microgrid power station features an emergency backup power supply. If a generator fails or requires maintenance, the backup methanol generator and energy storage system can quickly take over power, ensuring the continued operation of the electric drive equipment and avoiding production stagnation and economic losses caused by power outages, thereby enhancing the resilience and safety of the wellsite power supply system.

[0021] As a preferred technical solution of the present invention, the charging and discharging strategy of the intelligent energy storage system is as follows: when the microgrid control system monitors that any parameter of the bus voltage, current, power or frequency drops below 90% of its rated value and the change time is less than 1s, the microgrid control system controls the intelligent energy storage system to switch to the discharge mode, and delays 0-10s to switch to the charging mode after the bus voltage, current, power and frequency all recover to 90-100% of the rated value.

[0022] The beneficial effects are: By connecting methanol generator sets in parallel, the basic power supply capacity is increased (covering some sudden loads and providing continuous power), reducing the load factor of each unit. By implementing an intelligent energy storage system to offset transient power shortfalls, this overcomes the difficulty of methanol generator sets alone in handling shock loads and ensures stable power supply for oilfield drilling platforms. Containerized methanol generator sets allow for rapid hoisting and stacking for transportation, occupy a small footprint, and facilitate internal zoning and management.

[0023] The intelligent energy storage system can rapidly intervene and discharge when the bus voltage, current, power, or frequency drops below 90% of the rated value, with a change time of less than 1 second. This effectively addresses sudden load increases and power supply fluctuations, ensuring system stability. After the bus voltage, current, power, and frequency return to 90-100% of the rated value, the intelligent energy storage system delays switching to charging mode for 0-10 seconds, avoiding frequent starts and stops caused by brief fluctuations, extending equipment life, and improving system reliability. By precisely controlling the start and end of the energy storage system, unnecessary energy loss is minimized, improving the energy efficiency of the entire distributed microgrid power station system. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1It is a structural schematic diagram of the present invention; In the figure: 1. Methanol generator set; 2. Methanol tank; 3. Intelligent energy storage system. DETAILED DESCRIPTION

[0025] The specific embodiments of the present invention will be described in detail below. It should be noted that the following examples are only used to explain the technical solutions of the present invention and do not constitute a limitation to the scope of protection. Based on the essence of the present invention, all equivalent embodiments obtained by those skilled in the art without the need for creative work should be included in the scope of protection of the present invention.

[0026] The principles and spirit of the present invention are explained in detail below with reference to several representative embodiments of the present invention.

[0027] like Figure 1 A distributed microgrid power station system based on methanol fuel is shown, including multiple methanol generator sets 1, methanol tanks 2, intelligent energy storage systems 3 and microgrid control systems arranged in parallel; the methanol generator set 1 is used to power the load; the methanol tank 2 supplies fuel to the methanol generator set and can meet the endurance requirements of the methanol generator set 1; the microgrid control system is communicated with the methanol generator set 1, the intelligent energy storage system 3 and the methanol tank 2. The microgrid control system dynamically adjusts the number of operating methanol generator sets 1 and the charging and discharging strategy of the intelligent energy storage system 3 to achieve parallel operation of multiple units, dynamic load distribution and remote monitoring functions; the intelligent energy storage system 3 is connected in parallel with the methanol generator set 1 via a busbar. When the power demand is low, the microgrid control system controls the intelligent energy storage system 3 to store excess electricity; when the power demand is peak, the microgrid control system controls the intelligent energy storage system 3 to release electricity to balance load fluctuations.

[0028] Methanol generator sets 1 are containerized structures, coated with a nano-hydrophobic coating and a thermal insulation coating applied to the upper surface of the thermal insulation coating. The interior of the containerized structure is insulated with soundproofing foam. The containerized structure includes a partitioned fuel room, control room, unit compartment, and radiator compartment. It is equipped with dust filters and a closed cooling system with electronic fans, suitable for ambient temperatures of -40°C to 45°C. Six to 16 methanol generator sets 1 are installed, and load is evenly distributed across multiple units, with a distribution deviation of no more than 5%. Multiple methanol generator sets 1 communicate with the microgrid control system via a CAN bus. A CAN-based load distribution algorithm is used, with a distribution deviation of no more than 5%. Methanol generator sets 1 are connected in parallel, and any failure of a single unit automatically prevents system-wide downtime. The CAN bus enables efficient communication and data exchange, accurately monitoring and adjusting the operating status of each generator set, thereby ensuring optimal load distribution across the entire system. This not only improves system efficiency but also extends equipment life. Keeping the load distribution deviation within 5% can effectively avoid system instability caused by overloading or underloading a single generator set; such meticulous management helps maintain the smooth operation of the entire power supply system and reduce the possibility of failures.

[0029] The methanol generator set container is also equipped with a temperature control system to ensure normal operation of the methanol generator set 1 within an ambient temperature range of -30°C to 45°C. This temperature control system uses an air-cooled air conditioner for temperature control. The air-cooled air conditioner has both cooling and heating functions. When the temperature inside the container drops below 5°C, the air-cooled air conditioner activates heating; when the temperature inside the container rises above 30°C, cooling is activated. The temperature control system maintains the outdoor temperature inside the container between 5°C and 30°C.

[0030] In addition to the silent cotton covering the container surface, a silencer is also installed inside the container to further reduce the noise generated by the methanol generator set during operation, improving the noise reduction effect. Through multiple noise reduction measures, a quieter and more comfortable working environment is provided for the staff.

[0031] The container is also equipped with a fire-fighting unit, which is a PACK-grade perfluorohexanone fire extinguishing suppression device.

[0032] Methanol generator set 1 has a single unit rated power of 200kW-500kW and features a built-in methanol engine and an all-copper brushless excitation generator. The methanol engine utilizes a high compression ratio (12.5:1), multi-point electronically controlled injection, and single-cylinder independent high-energy ignition technology, achieving a fuel consumption of ≤410g / kWh.

[0033] Methanol generator set 1 has an integrated methanol storage tank to support three hours of continuous operation under continuous operating conditions. Dynamic startup and shutdown of the unit based on load demand reduces no-load losses. In this embodiment, the rated power of methanol generator set 1 is 300 kW, and the methanol storage tank has a capacity of 600 L. Alternatively, the rated power of methanol generator set 1 can be 250 kW, 400 kW, 450 kW, and so on.

[0034] Methanol tank 2 is a 40m³ stainless steel methanol tank (storage capacity 31.6 tons). Methanol tank 2 meets the endurance requirements of methanol generator set 1.

[0035] The microgrid control system monitors the bus voltage, current, power, and frequency in real time. When any of these parameters drops to 80-90% of the rated value, the microgrid control system controls the intelligent energy storage system 3 to start up. After the bus voltage, current, power, and frequency recover to 90-100% of the rated value, the microgrid control system controls the intelligent energy storage system 3 to exit with a delay of 0-10 seconds.

[0036] Intelligent Energy Storage System 3 stores excess energy during low-load periods and releases it during high-load periods to balance load fluctuations, reduce stress on the generator sets, and ensure they operate at a more stable power point, thereby improving overall efficiency and reducing methanol consumption and operating costs. Intelligent Energy Storage System 3 includes a battery system, PCS, and temperature control system.

[0037] The battery system includes battery cells and a BMS for controlling the battery cells.

[0038] The battery cells are high-rate lithium iron phosphate cells. In this embodiment, 3.2V / 31Ah lithium iron phosphate cells are used. The battery system consists of 24 cells connected in series to form a 24-string module. Five parallel sets of 24-string modules form a 76.8V / 155Ah battery pack. Seventeen battery packs are then connected in series and matched with a high-voltage box to form a 1305.6V / 155Ah battery cluster (i.e., the battery system). The rated capacity of the battery cluster is 202.37kWh.

[0039] The high-voltage box manages the battery cluster's high-voltage power circuit, collecting battery cluster voltage and current, controlling the cluster circuit contactors, and providing protection. It integrates circuit breakers, fuses, contactors, shunts, a master control unit (BCU), pre-charge resistors, and pre-charge contactors. The BCU features a daisy-chain communication interface for communication with the BMU, enabling control, protection, communication, and data logging for the battery cluster.

[0040] Each battery pack is equipped with a fire protection system, which includes a fire protection composite detector, fuse, and fire extinguishing unit.

[0041] The fire alarm system is a combination fire detector that detects temperature, smoke, and VOC concentrations. When the temperature, smoke, or VOC concentration inside the battery pack exceeds a preset threshold, the fire alarm system immediately triggers an alarm signal and activates a multi-chamber aerosol fire extinguishing unit through the microgrid control system, rapidly extinguishing the fire and preventing its spread.

[0042] A fuse is a device that protects against electrical short circuits and overcurrent.

[0043] The fire extinguishing unit is a pack-level perfluorohexanone fire extinguishing device, consisting of an agent storage tank, piping, and dedicated perfluorohexanone nozzles. It employs a combination of localized application and total flooding, with each battery pack (i.e., battery module) serving as the localized application unit. (Each battery module is equipped with an atomizing nozzle, allowing the fire extinguishing agent to directly impact the module's interior for precise fire extinguishing.) When an alarm sounds within a battery module, activating the perfluorohexanone fire extinguishing device requires the module's corresponding control valve to be opened. The atomizing nozzles within that module simultaneously release perfluorohexanone fire extinguishing agent, providing intermittent spot spraying to achieve continuous cooling and prevent re-ignition. The entire energy storage battery compartment (i.e., the intelligent energy storage system) is subject to a total flooding fire extinguishing system (fully submerged nozzles are deployed on top of the compartment).

[0044] The BMS utilizes a two-tier architecture of slave and master control, consisting of one master control unit (BCU) and 17 slave control units (BMUs). Passive balancing is employed. The BMS communicates with the microgrid control system. The BMS provides comprehensive internal equipment status monitoring and control, fault alarm and protection, and event logging. The BMS monitors key battery pack parameters, such as voltage, current, and temperature, in real time to ensure safe and efficient operation. Upon detecting a parameter anomaly, the microgrid control system instructs the BMS to immediately implement protective measures, such as power cutoff or activation of the cooling system, to prevent dangerous battery pack conditions such as thermal runaway or short circuits.

[0045] The PCS is integrated with the battery system, connecting it to the busbar to achieve bidirectional power conversion and ensure stable system operation by regulating voltage and frequency. The microgrid control system obtains battery system power storage information through the PCS and controls the operation and shutdown of the generator sets and the charging and discharging of the battery energy storage system based on this power storage information and load status.

[0046] Temperature control system: For batteries, excessively high or low temperatures will affect performance and life. The temperature control system can be air-cooled, liquid-cooled, phase-change materials, etc. In this embodiment, the temperature control system uses an air-cooled air conditioner for temperature control. The air-cooled air conditioner has cooling and heating functions. The cooling function can effectively solve problems such as thermal runaway caused by excessively high temperatures during battery charging and discharging, severe battery capacity degradation, and product life degradation. The heating function can effectively solve the problem that batteries are not conducive to charging and discharging in low temperature environments and cold areas, and can ensure normal charging and discharging of the battery, so that the battery can operate efficiently within the appropriate temperature range.

[0047] The air-cooled air conditioner uses its air supply function to achieve uniform temperature distribution within the cabinet, preventing local overheating. When the cabinet temperature falls below the cooling start temperature, the air supply function automatically activates. The air-cooled air conditioner also has a dehumidification function. When the humidity inside the intelligent energy storage system cabinet exceeds the dehumidification start temperature (default 80%, range 50% to 99%) and the cabinet temperature falls below the dehumidification start temperature (default 25°C, range 20% to 40°C), electric heating and dehumidification are activated. Heating stops when the cabinet temperature rises to the dehumidification stop temperature (default 30°C, range 25% to 50°C) or when the humidity drops back to the dehumidification stop temperature (default 75%, range 50% to 99%).

[0048] When an air-cooled air conditioner is powered on, the low-pressure vapor of the refrigerant in the refrigeration system is drawn into the compressor, compressed into high-pressure vapor, and discharged into the condenser. Simultaneously, air drawn in by the external cabinet fan flows through the condenser, removing the heat released by the refrigerant and condensing the high-pressure refrigerant vapor into a high-pressure liquid. The high-pressure liquid passes through the throttling device and is sprayed into the evaporator, where it evaporates at a correspondingly low pressure, absorbing the surrounding heat. Simultaneously, the internal cabinet fan forces air to continuously pass over the evaporator's fins for heat exchange, and delivers the cooled air back into the cabinet. This continuous circulation of air within the cabinet lowers the temperature.

[0049] The air-cooling air conditioning control modes are as follows: Start-up mode from standby state: When the temperature inside the equipment (intelligent energy storage system) cabinet is detected to be below 0°C, the air-cooled air conditioner starts heating and continues heating to 10°C, then allows the battery to enter normal working state, that is, charging and discharging state.

[0050] Normal operating mode: When the temperature inside the equipment cabinet is detected to be below 5°C, heating is activated; when the temperature inside the outdoor cabinet is above 30°C, cooling is activated. The temperature control system maintains the temperature inside the outdoor cabinet between 5°C and 30°C.

[0051] The intelligent energy storage system has an energy storage capacity of 150-300 kWh and a DC voltage of 1020-1489 V. In this embodiment, the energy storage capacity of the intelligent energy storage system is 202.37 kWh. Of course, in other implementations, the energy storage capacity of the intelligent energy storage system can also be 120 kWh, 250 kWh, 280 kWh, etc.

[0052] By intervening in advance with an intelligent energy storage system to compensate for the sudden power gap of the methanol generator set, the problem of the methanol generator set being unable to cope with the impact load alone due to excessive instantaneous power demand from loads such as drilling platforms and the generator set being unable to keep up with the power demand can be solved.

[0053] By using an intelligent energy storage system to intervene in advance to compensate for the cold-start power gap of the methanol generator set (methanol needs to be preheated to above 65°C), the problem of the methanol generator set being unable to cope with shock loads alone due to its low calorific value and difficulty in cold starting is solved, and the power supply reliability of oilfield mines is improved to a level close to that of urban power grids.

[0054] A control method for a methanol-fueled distributed microgrid power station system includes: a microgrid control system dynamically adjusting the number of methanol generator sets in operation and the charging and discharging strategy of an intelligent energy storage system based on historical load data and real-time bus voltage, current, power, and frequency inputs; When any methanol generator fails, the microgrid control system automatically switches to the backup methanol generator and triggers the intelligent energy storage system for emergency power supply to ensure the continuity of load power supply. The terminal monitors fuel consumption and equipment status in methanol tanks and methanol storage tanks to achieve preventive maintenance.

[0055] Dynamically adjust the number of operating methanol generator sets: 1. Predict sudden load events based on historical load data (when any parameter of bus voltage, current, power or frequency drops below 90% of its rated value and the change time is less than 1s, it is determined to be a sudden load event), and preheat the standby units 5 to 10 minutes in advance; 2. Monitor load demand in real time and dynamically adjust the number of operating units: If the load rate continues to be >85% for 2 minutes (to prevent false triggering), the standby unit is enabled, the microgrid control system sends a grid-connected command, and the new standby unit is connected to the bus through pre-synchronization grid-connected technology; if the load rate continues to be <50% for 5 minutes (to avoid frequent start and stop), the redundant units are gradually shut down.

[0056] The intelligent energy storage system's charging and discharging strategy is as follows: When the microgrid control system detects that any of the bus voltage, current, power, or frequency parameters has dropped to 80% of its rated value, the microgrid control system controls the intelligent energy storage system to switch to discharge mode. After the bus voltage, current, power, and frequency have all recovered to 90-100% of their rated values, the system switches to charging mode after a delay of 0-10 seconds. Of course, in other embodiments, the intelligent energy storage system can also switch to discharge mode when any of the bus voltage, current, power, or frequency parameters drops to 88%, 85%, or even 75% of their rated values.

[0057] like Figure 1 As shown, take the 90# drilling platform (named according to the drilling depth) as an example: 1. Deploy 10 methanol generator sets with a total installed capacity of 3MW, connected in parallel with an intelligent energy storage system; the units are arranged side by side, with 1-2 meters of spacing reserved between each unit to meet maintenance and heat dissipation requirements.

[0058] 2. After generating electricity locally, the units are connected in parallel via power cables (i.e., busbars) and output to the well crew's power distribution room, creating an independent microgrid to power on-site operations and daily life. A safe distance of at least 15 meters is maintained between the methanol tank and the container.

[0059] 3. Intelligent control: The microgrid control system automatically allocates five units to full load (250kW each) and adjusts the intelligent energy storage system to cope with sudden load demands. The remaining units are supplemented by increased loads as drilling depth increases.

[0060] 4. Operation and maintenance management: The microgrid control system remotely monitors fuel inventory and equipment health status.

[0061] According to the above description of this specification, those skilled in the art may also understand that the terms used below, such as "inside", "outside" and other terms indicating orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings of this specification. They are only for the purpose of facilitating the explanation of the scheme of the present invention and simplifying the description, rather than explicitly or implicitly indicating that the devices or elements involved must have the specific orientation, be constructed and operated in a specific orientation. Therefore, the above-mentioned orientation or positional relationship terms cannot be understood or interpreted as limitations on the scheme of the present invention.

[0062] In addition, in the description of this specification, “a plurality of” means at least two, for example, two, three or more, etc., unless otherwise clearly and specifically defined.

Claims

1. A distributed microgrid power station system based on methanol fuel, characterized in that: Used for power supply of oilfield drilling platform loads, including multiple methanol generator sets connected in parallel, methanol tanks, intelligent energy storage systems and microgrid control systems. The methanol generator set is used to supply power to the load. The methanol generator set is a container-type structure. A plurality of the methanol generator sets are connected in parallel via a busbar. The methanol tank supplies fuel to the methanol generator set and can meet the endurance requirements of the methanol generator set; The microgrid control system is in communication with the methanol generator set and the intelligent energy storage system to dynamically adjust the number of operating methanol generator sets and the charging and discharging strategy of the intelligent energy storage system; The intelligent energy storage system is connected in parallel with the methanol generator set via a busbar; When power demand is low, the microgrid control system controls the intelligent energy storage system to store excess power; when power demand is peak, the microgrid control system controls the intelligent energy storage system to release power to balance load fluctuations.

2. A distributed microgrid power station system based on methanol fuel according to claim 1, characterized in that: The rated power of a single unit of the methanol generator set is 200kW-500kW. The methanol generator set has a built-in methanol engine and an all-copper brushless excitation generator.

3. A distributed microgrid power station system based on methanol fuel according to claim 2, characterized in that: The intelligent energy storage system has an energy storage capacity of 150-300 kWh and a DC voltage of 1020-1489 V.

4. A distributed microgrid power station system based on methanol fuel according to claim 3, characterized in that: The compression ratio of the methanol engine is (12-13):

1.

5. A distributed microgrid power station system based on methanol fuel according to claim 4, characterized in that: The outer surface of the container-type structure of the methanol generator set is covered with a nano-hydrophobic coating and a thermal insulation coating, and the nano-hydrophobic coating is arranged on the upper surface of the thermal insulation coating; the inner wall of the container-type structure is provided with a silent cotton; and the methanol storage tank is integrated inside the methanol generator set.

6. The control method of a distributed microgrid power station system according to any one of claims 1 to 5, characterized in that: The control method includes: The microgrid control system dynamically adjusts the number of methanol generator sets in operation and the charging and discharging strategy of the intelligent energy storage system based on historical load data and real-time bus voltage, current, power and frequency; When any methanol generator set fails, the microgrid control system automatically switches to the backup methanol generator set and triggers the intelligent energy storage system for emergency power supply to ensure the continuity of load power supply; Monitor fuel consumption and equipment status through the terminal to achieve preventive maintenance.

7. The control method of the distributed microgrid power station system according to claim 6, characterized in that: The charging and discharging strategy of the intelligent energy storage system is: When the microgrid control system detects that any of the bus voltage, current, power or frequency parameters drops below 90% of its rated value and the change time is less than 1s, the microgrid control system controls the intelligent energy storage system to switch to discharge mode, and switches to charging mode after a delay of 0-10s after the bus voltage, current, power and frequency have recovered to 90-100% of the rated value.

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