Multi-mode power supply system control method of small snorkeling platform

Abstract

The invention discloses a multi-mode power supply system control method of a small snorkeling platform, and relates to the field of ocean engineering equipment, the multi-mode power supply system comprises a main power supply system and a standby power supply system which are mutually redundant, and each power supply system comprises a plurality of power supply devices. The method comprises the steps that a main power supply system is started to operate and starts a corresponding power supply mode according to the operation condition of the small snorkeling platform; and monitoring the system state of the main power supply system in the power supply mode in real time, determining the fault type of the main power supply system when the system state indicates that the main power supply system is in a fault state, and switching to different power supply devices for power supply according to the fault type, or switching to the power supply device of the standby power supply system for power supply. By means of the method, the problems that a traditional renewable energy source power supply system is unstable and insufficient in energy supply are solved, the overall power output and duration of the power supply system are improved, and the working capacity of the small snorkeling platform under the complex working condition is ensured.

Description

Technical Field

[0001] This application relates to the field of offshore engineering equipment, and in particular to a control method for a multi-mode power supply system of a small snorkeling platform. Background Art

[0002] As an indispensable key equipment in the field of ocean monitoring, small snorkeling platforms are widely used in fields such as meteorological observation, water quality monitoring, and ocean scientific research, and are of great significance for promoting the development of ocean science, protecting the marine ecological environment, and ensuring maritime safety.

[0003] Small snorkeling platforms are deployed far from land and it is difficult to connect to shore-based power supplies. Therefore, renewable energy sources such as solar energy, wave energy, and wind energy are usually used as the main energy supply. However, due to the complex and changeable marine environment, small snorkeling platforms often have difficulty obtaining continuous and sufficient renewable energy, and there are problems of discontinuous energy conversion and insufficient power conversion efficiency in practical applications. For example, when a small snorkeling platform is in a long-term rainy or calm environment, its energy supply and power conversion efficiency are significantly reduced or even interrupted, seriously affecting the normal and stable operation of the small snorkeling platform. Summary of the Invention

[0004] In view of the above problems and technical requirements, this application proposes a control method for a multi-mode power supply system of a small snorkeling platform. The technical solution of this application is as follows:

[0005] A control method for a multi-mode power supply system of a small snorkeling platform, the multi-mode power supply system includes a main power supply system and a backup power supply system that are redundant to each other, and the main power supply system and the backup power supply system respectively include a plurality of power supply devices; the power supply devices include a plurality of power source devices and an AC distribution box and a PLC control box connected to each power source device; the multi-mode power supply system control method includes the following steps:

[0006] The main power supply system starts to operate and turns on the corresponding power supply mode according to the operating conditions of the small snorkeling platform. Different power supply modes are powered by different power source devices in the power supply system; the operating conditions include operation requirements and water area environment information, and the water area environment information includes the water surface wave height and the water depth at the location of the small snorkeling platform; the operation requirements include surface operation, underwater operation, surfacing operation, and diving operation;

[0007] Monitor the system state of the main power supply system in real time under the power supply mode, and the system state indicates the operating states of the respective power supply devices of the main power supply system;

[0008] When the system status indicates that the main power supply system is in a fault state, determine the fault type of the main power supply system in the power supply mode, and switch to different power supply devices corresponding to the power supply mode under the current operating condition according to the fault type for power supply, or switch to the power supply device of the standby power supply system to supply power according to the power supply mode under the current operating condition.

[0009] A further technical solution thereof is that turning on the corresponding power supply mode according to the operating condition of the small snorkeling platform includes:

[0010] When the operation requirement of the small snorkeling platform is surface operation, the PLC control box controls to turn on the corresponding power supply device according to the surface wave height, and supplies power to the load through the AC distribution box;

[0011] When the operation requirement of the small snorkeling platform is underwater operation, the PLC control box controls to turn on the corresponding power supply device according to the water depth at the location of the small snorkeling platform, and supplies power to the load through the AC distribution box;

[0012] When the operation requirement of the small snorkeling platform is surfacing operation or diving operation, the PLC control box controls to turn on the corresponding power supply device, and supplies power to the load through the AC distribution box.

[0013] A further technical solution thereof is that the power supply device includes a fuel cell stack and a lithium battery pack; when the operation requirement of the small snorkeling platform is surface operation, the PLC control box controls to turn on the corresponding power supply device according to the surface wave height, including:

[0014] When it is detected that the surface wave height is lower than the predetermined wave height threshold, the PLC control box controls to turn on the fuel cell stack, and supplies power to the load through the AC distribution box and charges the lithium battery pack;

[0015] When it is detected that the surface wave height is not lower than the predetermined wave height threshold, the PLC control box controls to turn on the fuel cell stack and the lithium battery pack, and supplies power to the load through the AC distribution box.

[0016] A further technical solution thereof is that the power supply device includes a water turbine generator and a lithium battery pack; when the operation requirement of the small snorkeling platform is underwater operation, the PLC control box controls to turn on the corresponding power supply device according to the water depth at the location of the small snorkeling platform, including:

[0017] When it is detected that the water depth at the location of the small snorkeling platform is lower than the predetermined water depth threshold, the PLC control box controls to turn on the water turbine generator, and supplies power to the load through the AC distribution box and charges the lithium battery pack;

[0018] When it is detected that the water depth at the location of the small snorkeling platform is not lower than the predetermined water depth threshold, the PLC control box controls to turn on the water turbine generator and the lithium battery pack, and supplies power to the load through the AC distribution box.

[0019] A further technical solution is that the power supply device includes a lithium battery pack; when the operation requirement of the small snorkeling platform is surface operation or diving operation, the PLC control box controls the lithium battery pack to be turned on and supplies power to the load through the AC distribution box.

[0020] A further technical solution is that the fault types include power supply device faults and control device faults; switching to different power supply devices corresponding to the current operating conditions for power supply according to the fault types, or switching to the power supply devices of the standby power supply system to supply power according to the power supply mode under the current operating conditions includes:

[0021] When there is a power supply device with abnormal operating status in the main power supply system, it is determined that the fault type is a power supply device fault, and it is determined to switch to different power supply devices for power supply according to the faulty power supply device, or switch to the power supply devices of the standby power supply system for power supply;

[0022] When the operating status of the AC distribution box or the PLC control box in the main power supply system is abnormal, it is determined that the fault type is a control device fault, and it is switched to the power supply devices of the standby power supply system for power supply.

[0023] A further technical solution is that the power supply device includes a fuel cell stack, a water turbine generator and a lithium battery pack; determining to switch to different power supply devices for power supply according to the faulty power supply device, or switching to the power supply devices of the standby power supply system for power supply includes:

[0024] When the operating condition of the small snorkeling platform is surface operation and the water surface wave height is lower than the predetermined wave height threshold, when the operating status of the fuel cell stack is abnormal, the PLC control box controls the lithium battery pack to be turned on and supplies power to the load through the AC distribution box; when the operating status of the fuel cell stack is abnormal and the operating status of the lithium battery pack is abnormal, it is switched to the power supply devices of the standby power supply system for power supply;

[0025] When the operating condition of the small snorkeling platform is surface operation and the water surface wave height is not lower than the predetermined wave height threshold, when the operating status of any power supply device in the fuel cell stack and the lithium battery pack is abnormal, it is switched to the power supply devices of the standby power supply system for power supply;

[0026] When the operating condition of the small snorkeling platform is underwater operation and the water depth at the location of the small snorkeling platform is lower than the predetermined water depth threshold, when the operating status of the water turbine generator is abnormal, the PLC control box controls the lithium battery pack to be turned on and supplies power to the load through the AC distribution box; when the operating status of the water turbine generator is abnormal and the operating status of the lithium battery pack is abnormal, it is switched to the power supply devices of the standby power supply system for power supply;

[0027] When the operating condition of the small snorkeling platform is underwater operation and the water depth at the location of the small snorkeling platform is not less than the predetermined water depth threshold, when the operating state of any power supply device in the hydroturbine generator and the lithium battery pack is abnormal, switch to the power supply device of the standby power supply system for power supply;

[0028] When the operating condition of the small snorkeling platform is ascending operation or descending operation, when the operating state of the lithium battery pack is abnormal, switch to the power supply device of the standby power supply system for power supply.

[0029] A further technical solution thereof is that detecting the abnormal operating state of any power supply device includes:

[0030] Determine that the operating state of the power supply device is abnormal when the operating state data generated during the operation of the power supply device exceeds the predetermined range.

[0031] A further technical solution thereof is that the multi-mode power supply system further includes a remote control station, and the main power supply system and the standby power supply system are communicatively connected to the remote control station; monitor the system state of the main power supply system through the remote control station, and control the opening and closing of the main power supply system and the standby power supply system as well as the switching of the main power supply system to the standby power supply system.

[0032] The beneficial technical effects of the present application are:

[0033] A control method for a multi-mode power supply system of a small snorkeling platform proposed by the present application is applicable to a small snorkeling platform operating in a marine environment far from land. By designing two sets of decoupled and independent power supply systems to supply power to the load, the working logics do not cross each other. Combining remote and PLC intelligent control to monitor the operating state of the power supply system in real time, it can timely capture system anomalies and equipment failure information and switch to the standby power supply mode, realizing automatic power supply and intelligent switching under different operating scenarios and operating conditions, and having a high level of automation and intelligence. Through precise management of the power supply of the small snorkeling platform, it overcomes the instability and insufficient energy supply problems of traditional renewable energy power supply systems, improves the overall power output and duration of the power supply system, and ensures the working ability of the small snorkeling platform under complex working conditions.

[0034] Aiming at the operation requirements of the small snorkeling platform in different scenarios such as on the water surface and underwater, and at the same time considering the impact of high-risk sea conditions during offshore operations on the working performance of the small snorkeling platform. Each power supply system adopts multiple power supply modes to ensure that the small snorkeling platform can operate safely and stably and the power supply is controlled under different operation requirements under complex, harsh and high-risk sea conditions. It effectively improves the survival ability and system stability of the small snorkeling platform in a high-sea condition environment and effectively extends the operation and maintenance cycle. Description of the Drawings

[0035] Figure 1It is the system structure diagram of a multi-mode power supply system.

[0036] Figure 2 It is the flowchart of the control method for a multi-mode power supply system.

[0037] Figure 3 It is the flowchart of power supply mode switching in case of power device failure in an embodiment. Detailed implementation manners

[0038] The following further describes the detailed implementation manners of the present application with reference to the accompanying drawings.

[0039] A control method for a multi-mode power supply system of a small snorkeling platform proposed in the present application is applicable to a small snorkeling platform operating in a marine environment far from land. The small snorkeling platform is a marine environment monitoring device with the functions of surfacing and diving and capable of performing surface and underwater operations. The system structure of the multi-mode power supply system is as Figure 1 shown. The multi-mode power supply system includes a main power supply system and a backup power supply system that are redundant with each other. The main power supply system and the backup power supply system respectively include a plurality of power supply devices. The power supply devices include a plurality of power devices, an AC distribution box, and a PLC control box connected to each power device. Figure 1 The thick solid line with an arrow represents the power connection, and the thin solid line without an arrow represents the control connection. The main power supply system, the backup power supply system, and the load are all arranged inside the small snorkeling platform.

[0040] The structures of the main power supply system and the backup power supply system are exactly the same, but they are independent of each other and do not interfere with each other. Each power supply system can provide the same power supply performance for the load. The power supply equipment includes power supply devices and control devices. The power supply devices include a fuel cell stack, a hydro-turbine generator, and a lithium battery pack. The lithium battery pack includes lithium batteries, a lithium battery charger for controlling the charging of the lithium batteries, and a lithium battery inverter for controlling the discharging of the lithium batteries. The control devices include an AC distribution box for distributing electricity and a PLC control box for controlling the opening and closing of each power supply device and the AC distribution box. Among them, a control chip with an automated intelligent control program is integrated in the PLC control box, which is used for the power supply control and power supply mode monitoring of the small snorkeling platform and the load. The fuel cell is used to supply power to the load when the small snorkeling platform is operating on the water surface. Corresponding sensors are equipped inside it to be able to monitor in real time the operating state data such as the current, voltage, temperature, and pressure generated by the fuel cell during power supply. The hydro-turbine generator is used to supply power to the load when the small snorkeling platform is operating at low power underwater. Corresponding sensors are equipped inside it to be able to monitor in real time the operating state data such as the current, voltage, and the rotational speed of the hydro-turbine generator generated by the hydro-turbine generator during power supply. The lithium batteries in the lithium battery pack are used to supply power to the load when the small snorkeling platform is operating at high power underwater or in emergency situations such as the failure of the fuel cell and the hydro-turbine generator. Corresponding sensors are equipped inside it to be able to monitor in real time the operating state data such as the current, voltage, and temperature of the lithium batteries generated by the lithium batteries during power supply. Corresponding sensors are also equipped inside the lithium battery charger and the lithium battery inverter to be able to monitor in real time the operating state data such as the voltage, current, and temperature generated by their respective operations. Corresponding sensors are also equipped inside the AC distribution box and the PLC control box to be able to monitor in real time the operating state data such as the voltage, current, and temperature generated by their respective operations.

[0041] The load includes a thruster, a thruster distribution box, a ballast pump, a ballast control box, a DC low-voltage distribution box, a leakage sensor, a height sensor, a depth sensor, a pressure sensor, a positioning sensor, an attitude sensor, as well as an underwater acoustic communication device and a satellite communication device. The thruster is used for the movement of the small snorkeling platform on the water surface, underwater, and during surfacing and diving. The thruster distribution box is used for the power supply control of the thruster. The ballast control box is used for the start-stop control of the ballast pump and the valve switch control of the small snorkeling platform. The ballast pump is used for injecting and discharging ballast water. The leakage sensor is used for monitoring the leakage state inside the small snorkeling platform cabin. The height sensor is used for monitoring the height information of the small snorkeling platform from the bottom of the water. The depth sensor is used for monitoring the diving depth information of the small snorkeling platform. The pressure sensor is used for monitoring the water pressure information at the diving position of the small snorkeling platform. The positioning sensor is used for monitoring the positioning information of the small snorkeling platform. The attitude sensor is used for monitoring the attitude information of the small snorkeling platform. The underwater acoustic communication device is used for underwater communication of the small snorkeling platform. The satellite communication device is used for surface communication of the small snorkeling platform.

[0042] The main power supply system, the backup power supply system, and the load are all set on a small snorkeling platform. To achieve the switching of power supply modes and power supply systems, the multi-mode power supply system designed in this application further includes a remote control station set on a mother ship or a shore base. The main power supply system and the backup power supply system are communicatively connected to the remote control station through underwater acoustic communication devices and underwater communication devices; the system status of the main power supply system is monitored through the remote control station, and the main power supply system and the backup power supply system are controlled to be turned on and off, as well as the main power supply system is switched to the backup power supply system.

[0043] Based on this multi-mode power supply system, for the control method of the multi-mode power supply system proposed in this application, please refer to Figure 2 the flowchart shown below. The specific steps are as follows:

[0044] Step 1, the main power supply system starts to operate and turns on the corresponding power supply mode according to the operating conditions of the small snorkeling platform. Different power supply modes are powered by different power supply devices in the power supply system; the operating conditions include operation requirements and water area environment information. The water area environment information includes the water surface wave height and the water depth at the location of the small snorkeling platform; the operation requirements include surface operation, underwater operation, surfacing operation, and diving operation.

[0045] Since the operating conditions of the small snorkeling platform at sea are complex and changeable, the traditional power supply system relying on renewable energy cannot meet the continuous and stable energy supply, and for high-power operation tasks such as the surfacing and diving of the small snorkeling platform, only relying on renewable energy cannot provide sufficient energy supply. Therefore, this application adopts multiple energy supply modes to achieve energy supply under different operating conditions.

[0046] In one embodiment, considering that the sea waves are the environmental factors that have the greatest impact on the operation of the small snorkeling platform on the sea surface, this application mainly focuses on the water surface wave height as the water area environment information. Considering the impact of water depth on the operation performance of the water turbine generator, this application also focuses on the water depth as the water area environment information. Therefore, the water area environment information includes the water surface wave height and the water depth. Among them, the water surface wave height can be obtained by the method of measuring wave height in the existing technology. In this application, it is measured by the sensors carried by the small snorkeling platform. By installing pressure sensors at the bottom or near the small snorkeling platform, the periodic change of water pressure is monitored. The static water pressure is proportional to the water depth, and the dynamic pressure change caused by the waves can reflect the wave height. The specific measurement and calculation methods belong to the existing technology and will not be elaborated in this application. The water depth is measured by the depth sensor carried by the small snorkeling platform. The operation requirements include surface operation, underwater operation, surfacing operation, and diving operation. Turning on the corresponding power supply mode according to the operating conditions of the small snorkeling platform includes:

[0047] When the operation requirement of the small snorkeling platform is surface operation, the PLC control box controls the activation of the corresponding power equipment according to the water surface wave height where the small snorkeling platform is located, and supplies power to the load through the AC distribution box.

[0048] When the small snorkeling platform is operating on the water surface, it needs to move to a specified position on the water surface to perform tasks such as marine environment detection, and is mainly affected by wind and waves. Under normal circumstances, when the sea wind and waves are small, the electric energy provided by the fuel cell stack is sufficient to meet the power supply requirements of loads such as thrusters and sensors. However, in dangerous situations with abnormal weather and high sea wind and waves, relying solely on the electric energy provided by the fuel cell stack cannot meet the power supply requirements of the thrusters, which will cause the small snorkeling platform to be unable to move in time to avoid wind and waves and be damaged. Therefore, the PLC control box needs to automatically activate different power supply modes according to the sea wind and wave conditions to improve the adaptability of the small snorkeling platform to the environment.

[0049] In one embodiment, when the operation requirement of the small snorkeling platform is surface operation, the specific method for the PLC control box to control the activation of the corresponding power equipment according to the water surface wave height is as follows:

[0050] When it is detected that the wave height at the location of the small snorkeling platform is lower than the predetermined wave height threshold, the PLC control box controls the activation of the fuel cell stack, and supplies power to the load through the AC distribution box and charges the lithium battery pack. A part of the alternating current generated by the fuel cell stack is distributed to the propulsion distribution box through the AC distribution box to supply power to the thruster to propel the small snorkeling platform to move on the water surface; a part is distributed to the DC distribution box through the AC distribution box and converted into direct current to supply power to the sensor load equipment; a part is input into the lithium battery charger through the AC distribution box to charge the lithium battery to ensure that the lithium battery has sufficient power.

[0051] When it is detected that the wave height at the location of the small snorkeling platform is not lower than the predetermined wave height threshold, the PLC control box controls the activation of the fuel cell stack and the lithium battery pack, and supplies power to the load through the AC distribution box. Since high wind and waves seriously hinder the movement of the small snorkeling platform on the water surface, higher-power electric energy is required to maintain the movement of the small snorkeling platform. The fuel cell stack and the lithium battery pack need to supply power to load equipment such as thrusters and sensors at the same time. All the alternating current generated by the fuel cell stack is distributed to the propulsion distribution box and the DC distribution box through the AC distribution box to supply power to load equipment such as thrusters and sensors. At the same time, the lithium battery converts the direct current generated by the lithium battery into alternating current through the lithium battery inverter and distributes the alternating current to the propulsion distribution box and the DC distribution box through the AC distribution box, and then supplies power to load equipment such as thrusters and sensors.

[0052] Among them, any fuel cell of the existing technology can be adopted for the fuel cell stack. In this application, a diesel generator is selected considering the cost and power generation of the fuel cell. The wave height threshold is custom-set according to the actual application scenario of the target sea area.

[0053] When the operation requirement of the small snorkeling platform is underwater operation, the PLC control box controls the activation of the corresponding power supply equipment according to the water depth at the location of the small snorkeling platform, and supplies power to the load through the AC distribution box.

[0054] When the small snorkeling platform is operating underwater, it also needs to move underwater to a designated position to perform tasks such as underwater environment detection. Since the fuel cell cannot be used during underwater operation, a water turbine generator is adopted as the power source for underwater operation in this application. However, when the water turbine generator is operating underwater, the dynamic load on the water turbine blades increases sharply due to the deep water pressure, seriously affecting the power generation efficiency of the water turbine generator. When operating within the normal operating water depth of the water turbine generator, the electrical energy provided by the water turbine generator can meet the power supply requirements of loads such as thrusters and sensors. Renewable energy-generated electrical energy is preferentially used to extend the lifespan of the lithium battery. At greater water depths, the electrical energy provided by the water turbine generator alone cannot meet the power supply requirements of the thrusters, resulting in the small snorkeling platform being unable to move and operate normally. Therefore, the PLC control box needs to automatically activate different power supply modes according to the diving depth of the small snorkeling platform to improve the adaptability of the small snorkeling platform to the environment.

[0055] In one embodiment, when the operation requirement of the small snorkeling platform is underwater operation, the specific method for the PLC control box to control the activation of the corresponding power supply equipment according to the water depth at the location of the small snorkeling platform is as follows:

[0056] When it is detected that the water depth at the location of the small snorkeling platform is lower than the predetermined water depth threshold, the PLC control box controls the activation of the water turbine generator, and supplies power to the load and charges the lithium battery pack through the AC distribution box. Similarly, a part of the alternating current generated by converting wave energy into electrical energy by the water turbine generator is distributed to the propulsion distribution box through the AC distribution box to supply power to the thrusters to propel the movement of the small snorkeling platform underwater; a part is distributed to the DC distribution box through the AC distribution box to convert the alternating current into direct current, and then supply power to the sensor load equipment; a part is input into the lithium battery charger through the AC distribution box to charge the lithium battery to ensure sufficient power of the lithium battery.

[0057] When it is detected that the water depth at the location of the small snorkeling platform is not lower than the predetermined water depth threshold, the PLC control box controls the opening of the water turbine generator and the lithium battery pack, and supplies power to the load through the AC distribution box. Since the power generation performance of the water turbine generator in the deep water area decreases, the electric energy generated by the water turbine generator is not sufficient to maintain the normal operation of the small snorkeling platform. Therefore, it is necessary for the water turbine generator and the lithium battery pack to supply power to load devices such as thrusters and sensors at the same time. All the alternating current generated by the water turbine generator is distributed to the propulsion distribution box and the DC distribution box through the AC distribution box to supply power to load devices such as thrusters and sensors. At the same time, the lithium battery converts the direct current generated by the lithium battery power generation into alternating current through the lithium battery inverter and distributes the alternating current to the propulsion distribution box and the DC distribution box through the AC distribution box to supply power to load devices such as thrusters and sensors.

[0058] Among them, the water depth threshold is custom-set according to the actually used water turbine generator and the target sea area scenario.

[0059] When the operation requirement of the small snorkeling platform is ascending operation or descending operation, the PLC control box controls the opening of the corresponding power supply equipment and supplies power to the load through the AC distribution box.

[0060] Since the small snorkeling platform will be underwater during ascending and descending operations, the fuel cell stack cannot be used. Moreover, since the power required for ascending and descending is relatively high, relying solely on the power generation power of the water turbine generator cannot meet the load demand, while relying solely on the power generation power of the lithium battery pack can meet the load demand. Therefore, in one embodiment, when the operation requirement of the small snorkeling platform is ascending operation or descending operation, the PLC control box controls the opening of the lithium battery pack and supplies power to the load through the AC distribution box. The lithium battery converts the direct current generated by the lithium battery power generation into alternating current through the lithium battery inverter, and distributes the alternating current to the ballast control box, the propulsion distribution box and the DC distribution box through the AC distribution box to supply power to load devices such as ballast pumps, thrusters and sensors. When the small snorkeling platform is performing a descending operation, after the ballast control box is powered on to open the pump valve and inject ballast water, the thruster is used to complete the descending operation. Similarly, when the small snorkeling platform is performing an ascending operation, after the ballast control box is powered on to open the pump valve and discharge the ballast water, the thruster is used to complete the ascending operation.

[0061] Step 2, monitor the system state of the main power supply system in real time during the power supply mode, and the system state indicates the operating states of the various power supply devices of the main power supply system.

[0062] Use the PLC control box to monitor the operating states of the other power supply devices in the main power supply system except itself in real time, and at the same time use the remote control station to monitor the operating states of the power supply devices of the main power supply system and the standby power supply system.

[0063] When the system status indicates that the main power supply system is in a normal state, the main power supply system operates normally and switches to the power supply mode corresponding to different operation requirements according to the operation instructions sent by the remote control station. Taking a conventional operation sequence as an example, the switching of the power supply mode under normal conditions is described. The conventional operation sequence switches from surface operation to diving operation, then to underwater operation, then from underwater operation to surfacing operation, and finally back to surface operation. After the small snorkeling platform is deployed to the target sea area, first start the main power supply system in the surface state. After the main power supply system is started, the PLC control box is powered on and performs an initial state self-check on the main power supply system and each load device. After confirming that the state is normal, start the fuel cell stack. After the fuel cell stack operates normally, switch to the power supply mode of the fuel cell stack and charge the lithium battery pack.

[0064] When the PLC control box receives the surface operation instruction from the remote control station through the satellite communication device, it determines the working mode of the lithium battery pack according to the surface operation situation in step 1 based on the water area environment information, and controls the thruster to complete operation tasks such as movement, and controls the height sensor, depth sensor, pressure sensor, positioning sensor, and attitude sensor to complete the corresponding tasks.

[0065] When the small snorkeling platform is in the surface operation state and the PLC control box receives the diving operation instruction from the remote control station through the satellite communication device, it controls to stop the power supply of the fuel cell stack according to the diving operation situation in step 1. The lithium battery enters the lithium battery power supply mode through the lithium battery inverter, and controls the ballast control box to open the pump valve. After the ballast pump injects ballast water, it controls the thruster to complete the diving action, and controls the height sensor, depth sensor, pressure sensor, positioning sensor, and attitude sensor to complete the corresponding tasks.

[0066] After the small snorkeling platform dives underwater and the PLC control box receives the underwater operation instruction from the remote control station through the underwater acoustic communication device, it controls the hydroturbine generator to start generating electricity, determines the working mode of the lithium battery pack according to the underwater operation situation in step 1 based on the water area environment information, and controls the thruster to complete operation tasks such as movement, and controls the height sensor, depth sensor, pressure sensor, positioning sensor, and attitude sensor to complete the corresponding tasks.

[0067] When the small snorkeling platform is in the underwater operation state and the PLC control box receives the surfacing operation instruction from the remote control station through the underwater acoustic communication device, it controls to stop the power supply of the hydroturbine generator according to the surfacing operation situation in step 1. The lithium battery enters the lithium battery power supply mode through the lithium battery inverter, and controls the ballast control box to open the pump valve. After the ballast pump discharges the ballast water, it controls the thruster to complete the surfacing action, and controls the height sensor, depth sensor, pressure sensor, positioning sensor, and attitude sensor to complete the corresponding tasks. After surfacing to the water surface, switch to the power supply mode of the fuel cell stack to enter the next round of cyclic operation.

[0068] Step 3, when the system status indicates that the main power supply system is in a fault state, determine the fault type of the main power supply system in the power supply mode, and switch to different power supply devices corresponding to the power supply mode under the current operating condition according to the fault type for power supply, or switch to the power supply device of the standby power supply system to supply power according to the power supply mode under the current operating condition.

[0069] Due to the difficulty of maintaining and replacing small snorkeling platforms in the open sea, frequent replacement of power supply devices will greatly consume labor and material costs. Therefore, this application designs two redundant power supply systems, and each load device is powered by dual power supplies, which can ensure that when one power supply system fails, there is a standby power supply system to ensure operation, extend the operation and maintenance cycle of the small snorkeling platform, and improve the service life. Each power supply system includes multiple power supply devices, and the power supply devices that fail in different power supply modes are different, and the corresponding power supply mode switching methods are also different.

[0070] In order to further improve the service life of the main power supply system and make full use of the power in the system, when performing fault switching, it is preferred to switch within the main power supply system first. When there are no available power supply devices within the main power supply system, then switch to the standby power supply system. When switching within the main power supply system, the PLC control box in the system is directly used for automatic switching to improve the real-time performance of fault handling; when the main power supply system switches to the standby power supply system, the remote control station needs to send instructions to control the opening and closing of the main power supply system and the standby power supply system. The power supply devices of each power supply system include power supply devices and control devices. The power supply devices include fuel cell stacks, hydroturbine generators, and lithium battery packs. The control devices include AC control boxes and PLC control boxes.

[0071] In one embodiment, the fault types include power supply device faults and control device faults; switching to different power supply devices corresponding to the power supply mode under the current operating condition according to the fault type for power supply, or switching to the power supply device of the standby power supply system to supply power according to the power supply mode under the current operating condition includes:

[0072] When there are power supply devices with abnormal operating states in the main power supply system, determine that the fault type is a power supply device fault, and determine to switch to different power supply devices for power supply according to the faulty power supply device, or switch to the power supply device of the standby power supply system for power supply.

[0073] Since each power supply system includes multiple types of power supply devices, when a power supply device fails, priority should be given to considering whether it can be switched to the remaining power supply devices within the same power supply system. And different power supply modes require different power supply devices, so it is necessary to determine the switching method in combination with the operation requirements and the power supply devices that fail in the corresponding power supply mode under the operating condition.

[0074] During the whole process of the conventional operation sequence, the switching process of the power supply mode in case of failures of different power supply devices is as Figure 3 shown. In one embodiment, determining to switch to different power supply devices for power supply or to the power supply devices of the backup power supply system for power supply according to the power supply device that fails under the current power supply mode includes:

[0075] When the operating condition of the small snorkeling platform is surface operation and the water surface wave height at the location of the small snorkeling platform is lower than the predetermined wave height threshold, only the fuel cell stack can meet the load power supply demand at this time. When the operating state of the fuel cell stack is abnormal, it is preferred to switch to the lithium battery pack power supply mode, and the PLC control box controls to turn on the lithium battery pack and supply power to the load through the AC distribution box; when the operating state of the fuel cell stack is abnormal and the operating state of the lithium battery pack is also abnormal, there is no available power supply device inside the main power supply system at this time, and it is necessary to switch to the backup power supply system and turn on the corresponding power supply device, and the power supply device of the backup power supply system supplies power; the corresponding power supply mode of the backup power supply system is the same as that of the main power supply system, that is, turn on the fuel cell stack, the AC distribution box and the PLC control box of the backup power supply system.

[0076] When the operating condition of the small snorkeling platform is surface operation and the water surface wave height at the location of the small snorkeling platform is not lower than the predetermined wave height threshold, the fuel cell stack and the lithium battery pack need to supply power together to meet the load power supply demand at this time. When the operating state of any power supply device in the fuel cell stack and the lithium battery pack is abnormal, it is necessary to switch to the backup power supply system and turn on the corresponding power supply device, and the power supply device of the backup power supply system supplies power; the corresponding power supply mode of the backup power supply system is the same as that of the main power supply system, that is, turn on the fuel cell stack, the lithium battery pack, the AC distribution box and the PLC control box of the backup power supply system.

[0077] When the operating condition of the small snorkeling platform is underwater operation and the water depth at the location of the small snorkeling platform is lower than the predetermined water depth threshold, only the hydroturbine generator can meet the load power supply demand at this time. When the operating state of the hydroturbine generator is abnormal, it is preferred to switch to the lithium battery pack power supply mode, and the PLC control box controls to turn on the lithium battery pack and supply power to the load through the AC distribution box; when the operating state of the hydroturbine generator is abnormal and the operating state of the lithium battery pack is also abnormal, there is no available power supply device inside the main power supply system at this time, and it is necessary to switch to the backup power supply system and turn on the corresponding power supply device, and the power supply device of the backup power supply system supplies power; the corresponding power supply mode of the backup power supply system is the same as that of the main power supply system, that is, turn on the hydroturbine generator, the AC distribution box and the PLC control box of the backup power supply system.

[0078] When the operating condition of the small snorkeling platform is underwater operation and the water depth at the location of the small snorkeling platform is not lower than the predetermined water depth threshold, at this time, both the water turbine generator and the lithium battery pack need to supply power together to meet the load power supply requirements. When the operating state of any power supply device in the water turbine generator and the lithium battery pack is abnormal, it is necessary to switch to the standby power supply system and turn on the corresponding power supply device, and the power supply device of the standby power supply system supplies power; the corresponding power supply mode of the standby power supply system is the same as that of the main power supply system, that is, turn on the water turbine generator, lithium battery pack, AC distribution box and PLC control box of the standby power supply system.

[0079] When the operating condition of the small snorkeling platform is surfacing operation or diving operation, only the lithium battery pack can supply power to the load. When the operating state of the lithium battery pack is abnormal, at this time, there is no available power supply device inside the main power supply system, and it is necessary to switch to the standby power supply system and turn on the corresponding power supply device, and the power supply device of the standby power supply system supplies power; the corresponding power supply mode of the standby power supply system is the same as that of the main power supply system, that is, turn on the lithium battery pack, AC distribution box and PLC control box of the standby power supply system.

[0080] When the operating state of the AC distribution box or the PLC control box in the main power supply system is abnormal, it is determined that the fault type is a control device fault. At this time, there is no available control device inside the main power supply system, and it is necessary to switch to the standby power supply system and turn on the corresponding power supply device, and the power supply device of the standby power supply system supplies power; the corresponding power supply mode of the standby power supply system is the same as that of the main power supply system, that is, turn on the AC distribution box, PLC control box and the corresponding power supply device of the standby power supply system.

[0081] Since operation state data will be generated during the operation of each power supply device, the operation state data can directly represent whether the operation state of the power supply device is abnormal, and the operation state of the power supply device can be determined according to the operation state data of each power supply device. In one embodiment, the specific method for detecting that the operation state of any power supply device is abnormal is: when the operation state data generated during the operation of the power supply device exceeds the predetermined range, it is determined that the operation state of the power supply device is abnormal. For a power supply device with multiple types of operation state data, it can be determined whether it is in an abnormal operation state according to whether it belongs to the core function. As long as one type of operation state data corresponding to the core function exceeds the predetermined range, it is determined that the operation state of the power supply device is abnormal. The operation state data that does not belong to the core function can relax the determination threshold range or be ignored to increase the service life of the power supply device. In this application, in order to ensure safety and accuracy, for a power supply device with multiple types of operation state data, as long as one type exceeds the predetermined range, it is determined that the operation state of the power supply device is abnormal. Among them, the predetermined range of the operation state data is custom-set according to the actual application situation.

[0082] The above are only the preferred embodiments of the present application, and the present application is not limited to the above embodiments. It can be understood that other improvements and changes directly derived or associated by those skilled in the art without departing from the spirit and concept of the present application shall be considered to be included within the protection scope of the present application.

Claims

1. A control method for a multi-mode power supply system of a small snorkeling platform, characterized in that The multi-mode power supply system includes a main power supply system and a standby power supply system that are redundant to each other. The main power supply system and the standby power supply system respectively include a plurality of power supply devices. The power supply devices include a plurality of power source devices, an AC distribution box, and a PLC control box connected to each power source device. The control method of the multi-mode power supply system includes: The main power supply system starts to operate and turns on the corresponding power supply mode according to the operating conditions of the small snorkeling platform. Different power supply modes are powered by different power source devices in the power supply system. The operating conditions include operation requirements and water area environment information. The water area environment information includes the water surface wave height and the water depth at the location of the small snorkeling platform. The operation requirements include surface operation, underwater operation, surfacing operation, and diving operation. Monitor the system status of the main power supply system in real time under the power supply mode. The system status indicates the operating status of each power supply device of the main power supply system. When the system status indicates that the main power supply system is in a fault state, determine the fault type of the main power supply system under the power supply mode, and switch to different power source devices corresponding to the power supply mode under the current operating conditions according to the fault type, or switch to the power supply devices of the standby power supply system to supply power according to the power supply mode under the current operating conditions.

2. The control method of the multi-mode power supply system according to claim 1, wherein The turning on of the corresponding power supply mode according to the operating conditions of the small snorkeling platform includes: When the operation requirement of the small snorkeling platform is surface operation, the PLC control box controls the turning on of the corresponding power source device according to the water surface wave height, and supplies power to the load through the AC distribution box. When the operation requirement of the small snorkeling platform is underwater operation, the PLC control box controls the turning on of the corresponding power source device according to the water depth at the location of the small snorkeling platform, and supplies power to the load through the AC distribution box. When the operation requirement of the small snorkeling platform is surfacing operation or diving operation, the PLC control box controls the turning on of the corresponding power source device, and supplies power to the load through the AC distribution box.

3. The multi-mode power supply system control method according to claim 2, characterized in that The power source devices include a fuel cell stack and a lithium battery pack. When the operation requirement of the small snorkeling platform is surface operation, the PLC control box controlling the turning on of the corresponding power source device according to the water surface wave height includes: When it is detected that the water surface wave height is lower than a predetermined wave height threshold, the PLC control box controls the turning on of the fuel cell stack, and supplies power to the load through the AC distribution box and charges the lithium battery pack. When it is detected that the water surface wave height is not lower than the predetermined wave height threshold, the PLC control box controls the turning on of the fuel cell stack and the lithium battery pack, and supplies power to the load through the AC distribution box.

4. The control method of the multi-mode power supply system according to claim 2, wherein The power source devices include a water turbine generator and a lithium battery pack. When the operation requirement of the small snorkeling platform is underwater operation, the PLC control box controlling the turning on of the corresponding power source device according to the water depth at the location of the small snorkeling platform includes: When it is detected that the water depth at the location of the small snorkeling platform is lower than a predetermined water depth threshold, the PLC control box controls the turning on of the water turbine generator, and supplies power to the load through the AC distribution box and charges the lithium battery pack. When it is detected that the water depth at the location of the small snorkeling platform is not lower than the predetermined water depth threshold, the PLC control box controls the turning on of the water turbine generator and the lithium battery pack, and supplies power to the load through the AC distribution box.

5. The control method of the multi-mode power supply system according to claim 2, characterized in that, The power supply device includes a lithium battery pack; when the operation requirement of the small snorkeling platform is ascending operation or descending operation, the PLC control box controls to turn on the lithium battery pack and supply power to the load through the AC distribution box.

6. The control method of the multi-mode power supply system according to claim 1, wherein The fault types include power supply device faults and control device faults; switching to different power supply devices corresponding to the current operating condition for power supply according to the fault type, or switching to the power supply device of the standby power supply system to supply power according to the power supply mode under the current operating condition includes: When there is a power supply device with abnormal operating status in the main power supply system, it is determined that the fault type is a power supply device fault, and it is determined to switch to different power supply devices for power supply according to the faulty power supply device, or switch to the power supply device of the standby power supply system for power supply; When the operating status of the AC distribution box or the PLC control box in the main power supply system is abnormal, it is determined that the fault type is a control device fault, and it is switched to the power supply device of the standby power supply system for power supply.

7. The control method of the multi-mode power supply system according to claim 6, wherein The power supply device includes a fuel cell stack, a water turbine generator and a lithium battery pack; Determining to switch to different power supply devices for power supply according to the faulty power supply device, or switching to the power supply device of the standby power supply system for power supply includes: When the operating condition of the small snorkeling platform is surface operation and the surface wave height is lower than the predetermined wave height threshold, when the operating status of the fuel cell stack is abnormal, the PLC control box controls to turn on the lithium battery pack and supply power to the load through the AC distribution box; when the operating status of the fuel cell stack is abnormal and the operating status of the lithium battery pack is abnormal, it is switched to the power supply device of the standby power supply system for power supply; When the operating condition of the small snorkeling platform is surface operation and the surface wave height is not lower than the predetermined wave height threshold, when the operating status of any one of the fuel cell stack and the lithium battery pack is abnormal, it is switched to the power supply device of the standby power supply system for power supply; When the operating condition of the small snorkeling platform is underwater operation and the water depth at the location of the small snorkeling platform is lower than the predetermined water depth threshold, when the operating status of the water turbine generator is abnormal, the PLC control box controls to turn on the lithium battery pack and supply power to the load through the AC distribution box; when the operating status of the water turbine generator is abnormal and the operating status of the lithium battery pack is abnormal, it is switched to the power supply device of the standby power supply system for power supply; When the operating condition of the small snorkeling platform is underwater operation and the water depth at the location of the small snorkeling platform is not lower than the predetermined water depth threshold, when the operating status of any one of the water turbine generator and the lithium battery pack is abnormal, it is switched to the power supply device of the standby power supply system for power supply; When the operating condition of the small snorkeling platform is ascending operation or descending operation, when the operating status of the lithium battery pack is abnormal, it is switched to the power supply device of the standby power supply system for power supply.

8. The multi-mode power supply system control method according to claim 7, wherein Detecting that the operating status of any power supply device is abnormal includes: Determining that the operating status of the power supply device is abnormal when the operating status data generated during the operation of the power supply device exceeds the predetermined range.

9. The multi-mode power supply system control method according to claim 6, wherein The multi-mode power supply system further includes a remote control station, and the main power supply system and the backup power supply system are communicatively connected to the remote control station; the system status of the main power supply system is monitored through the remote control station, and the main power supply system and the backup power supply system are controlled to be turned on and off, and the main power supply system is switched to the backup power supply system.

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