Power source input control method for oil-electric dual-drive ship

Abstract

The present invention discloses a power source input control method for a dual-drive oil-electric vessel, comprising: determining whether a corresponding lithium battery is in use based on its usage status; determining whether a lithium battery propulsion mode switching condition is met based on the working status of a DC panel and a steering propeller; if the lithium battery propulsion mode switching condition is met, executing the switch and feeding back a lithium battery propulsion mode switching success signal; transferring the handle speed control authority to the motor; when the vessel is in lithium battery propulsion mode, if it is to switch to diesel engine propulsion mode, determining whether a diesel engine propulsion mode switching condition is met based on the working status of the diesel engine, the handle, and the clutch; if the diesel engine propulsion mode switching condition is met, sending a diesel engine propulsion mode switching request signal to the steering propeller, the frequency converter, and the DC panel in sequence and obtaining feedback; transferring the handle speed control authority to the diesel engine; and achieving main engine speed regulation and combined transmission by controlling the handle. This method achieves smooth switching between lithium battery and diesel engine propulsion modes.

Description

Technical Field

[0001] The present invention relates to the technical field of ships, and in particular to a power source input control method for an oil-electric dual-drive ship. Background Art

[0002] A ship's hybrid power system is one that uses two or more power sources for propulsion. Currently, these primarily involve a main diesel engine and an electric motor driving the propeller. The electric motor is typically driven by a generator set, fuel cell, or energy storage device, which in turn is comprised of batteries or supercapacitors.

[0003] At present, the research on hybrid-electric ships is still in its early stages, and there are many deficiencies in the power source input control of hybrid ships. Summary of the Invention

[0004] In view of this, an embodiment of the present invention provides a power source input control method for a dual-drive ship, so as to solve the problem of insufficient research on power source input of dual-drive ships in the prior art.

[0005] An embodiment of the present invention provides a method for controlling power source input of a dual-drive ship, comprising:

[0006] Determine whether the corresponding lithium battery is put into use according to the lithium battery usage status;

[0007] Determine whether the lithium battery propulsion mode switching conditions are met based on the working status of the DC panel and rudder propeller;

[0008] If the lithium battery propulsion mode switching conditions are met, the switch is executed and a lithium battery propulsion mode switching success signal is fed back;

[0009] Transfer the handle speed control authority to the motor;

[0010] When the ship is in lithium battery propulsion mode, if it is to be switched to diesel engine propulsion mode, the working status of the diesel engine, handle and clutch will be used to determine whether the diesel engine propulsion mode switching conditions are met;

[0011] If the diesel engine propulsion mode switching conditions are met, the diesel engine propulsion mode switching request signal is sent to the rudder propeller, inverter and DC panel in sequence and feedback is obtained;

[0012] Transfer the handle speed control authority to the diesel engine;

[0013] The main engine speed regulation and synchronization are achieved through the control handle.

[0014] Optionally, it also includes:

[0015] When the ship is in the diesel engine propulsion mode, if it is to be switched to the lithium battery propulsion mode, it is again determined whether the lithium battery propulsion mode switching conditions are met.

[0016] Optionally, judging whether the corresponding lithium battery is put into use according to the usage status of the lithium battery includes:

[0017] Obtain all lithium battery cell terminal voltages, lithium battery cluster operating currents, lithium battery temperatures, ambient humidity, fault alarms, and maximum allowable charge and discharge current values;

[0018] Calculate the state of charge of the lithium battery;

[0019] Determine whether the corresponding lithium battery meets the usage requirements based on the state of charge;

[0020] Determine whether the various parameters of the lithium battery are within the safe value.

[0021] Optionally, the conditions for putting the lithium battery into use are set as: the state of charge of the lithium battery is greater than 20%; the humidity of the lithium battery is less than 70%; and the temperature of the lithium battery is between 5°C and 30°C.

[0022] Optionally, the lithium battery propulsion mode switching conditions include:

[0023] The DC panel detects that the motor standby signal and the inverter are in a non-working state;

[0024] The steering propeller detects that the clutch is in split mode.

[0025] Optionally, the diesel engine propulsion mode switching conditions include:

[0026] The DC panel detects that the inverter is in non-working state;

[0027] The steering paddle handle is in zero position;

[0028] The clutch is in the split state;

[0029] The diesel engine is in running state.

[0030] Optionally, diesel propulsion modes include:

[0031] When the clutch is engaged by the handle and the speed is greater than 405rpm, the generator mode power generation function is automatically started; the shaft inverter starts and inputs the generator energy into the DC bus;

[0032] When the handle is pulled back to zero position, the generator mode power generation function is automatically stopped, or when the generator mode stop button is pressed, the shaft inverter stops, the generator stops providing energy and is disconnected from the DC bus.

[0033] Optionally, it also includes:

[0034] If no mode switching permission signal is received within 2 seconds after the diesel engine propulsion mode switching request signal is issued, the mode switching is determined to have failed.

[0035] Optionally, an automatic mode is also included:

[0036] The lithium battery pack, backup generator set, closing, grid connection and disconnection are all automatically calculated and executed by the power management system according to the load rate and control logic;

[0037] The power management system prioritizes operation in pure battery mode; in pure battery mode, all lithium battery packs are started to supply power; the power management system monitors the dynamic changes of power station power in real time; when the state of charge of all lithium battery packs is greater than or equal to 20%, the power management system keeps the lithium battery packs in discharge operation; when the average state of charge of all lithium battery packs is less than 20%, the power management system automatically starts the backup generator set to supply power and uses the excess energy of the backup generator to charge the lithium battery packs.

[0038] Optionally, a manual mode is also included:

[0039] The start and stop of the equipment can be manually controlled through the generator set control panel and the lithium battery pack control panel. After starting and stopping, the generator set and lithium battery pack will automatically connect to the grid or disconnect from the grid. Power distribution is performed by the power management system.

[0040] The charging, discharging and stopping of the lithium battery pack are controlled by the selection switch on the lithium battery pack control panel.

[0041] Beneficial effects of the embodiments of the present invention:

[0042] An embodiment of the present invention provides a power source input control method for a hybrid electric vessel. For lithium battery propulsion mode, data is first collected from each lithium battery in the battery pack to determine whether any unusable batteries are present. Before switching modes, the system status is evaluated to determine whether the conditions for the mode switch are met. After the mode switch is executed, if the mode switch fails, the reason for the failure is provided. This power source input control method enables smooth switching between lithium battery propulsion mode and diesel engine propulsion mode for hybrid electric vessels. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] The features and advantages of the present invention will be more clearly understood by referring to the accompanying drawings, which are schematic and should not be construed as limiting the present invention in any way. In the accompanying drawings:

[0044] Figure 1 A flow chart of a method for determining the operation of a lithium battery according to an embodiment of the present invention is shown;

[0045] Figure 2A lithium battery propulsion mode switching flow chart of a power source input control method for a dual-drive oil-electric vessel according to an embodiment of the present invention is shown;

[0046] Figure 3 A flowchart showing a diesel engine propulsion mode switching method of a power source input control method for a dual-drive ship of oil and electricity according to an embodiment of the present invention is shown;

[0047] Figure 4 A flowchart showing a method of switching from a diesel engine propulsion mode to a lithium battery propulsion mode according to an embodiment of the present invention is shown;

[0048] Figure 5 A flow chart showing the switching from a lithium battery propulsion mode to a diesel engine propulsion mode in an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0049] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making any creative efforts shall fall within the scope of protection of the present invention.

[0050] An embodiment of the present invention provides a method for controlling power source input of a dual-drive ship, comprising:

[0051] Step 1: Determine whether the corresponding lithium battery is put into use according to the lithium battery usage status.

[0052] In this embodiment, the power management system BMS and the independent monitoring and protection system of the lithium battery are responsible for collecting various data of the lithium battery, including all lithium battery cell terminal voltages, lithium battery cluster operating currents, lithium battery temperature, ambient humidity, fault alarms, maximum allowable charge and discharge current values ​​and other lithium battery related data, and the SOC value of the lithium battery remaining power percentage is calculated through various data; if the system determines that the SOC value can meet the use requirements and other battery parameters are within the set safety values, the lithium battery will be put into use, otherwise the lithium battery will not be put into use. In a specific embodiment, if Figure 1 As shown, the conditions for putting the lithium battery into use are set as follows: the state of charge of the lithium battery is greater than 20%; the humidity of the lithium battery is less than 70%; and the temperature of the lithium battery is between 5°C and 30°C.

[0053] Step 2: Determine whether the lithium battery propulsion mode switching conditions are met based on the working status of the DC panel and the rudder propeller.

[0054] In this embodiment, the remote control system determines the preconditions for mode switching, which are: the DC panel detects the motor standby signal and the inverter is in an inoperative state; the steering propeller handle is in zero position, and the clutch is in open position.

[0055] Step 3: If the lithium battery propulsion mode switching condition is met, the switching is performed and a lithium battery propulsion mode switching success signal is fed back.

[0056] In this embodiment, the remote control sends a lithium battery propulsion mode request signal to the DC panel and the steering propeller, the DC panel sends a lithium battery propulsion mode permission signal to the remote control, and the steering propeller sends a lithium battery propulsion mode permission signal to the remote control.

[0057] The mode switching conditions are met, that is, the propeller is in the lithium battery propulsion mode, the clutch is never disengaged, and the lithium battery propulsion mode button indicator is on.

[0058] Step 4: Transfer the handle speed control authority to the motor.

[0059] In this embodiment, the speed control authority of the handle is transferred to the motor. Press the motor start button and use the handle to control its speed. Figure 2 shown.

[0060] In a specific embodiment, if the mode switching conditions are not met, the mode indicator light continues to flash for more than 5 seconds, and then stops flashing. A comprehensive fault report is issued and the reason for the mode switching failure is transmitted to the DC panel. The display screen on the driving console displays the reason for the mode switching failure.

[0061] Step 5: When the ship is in the lithium battery propulsion mode, if it is to be switched to the diesel engine propulsion mode, it is determined whether the diesel engine propulsion mode switching conditions are met according to the working status of the diesel engine, the handle and the clutch.

[0062] In this embodiment, the remote control system determines the preconditions as follows: the DC panel internally detects that the inverter is in a non-operating state; the handle of the rudder propeller is in zero position; the clutch is in a split state; and the diesel engine is in an operating state.

[0063] Step 6: If the diesel engine propulsion mode switching conditions are met, the diesel engine propulsion mode switching request signal is sent to the rudder propeller, inverter and DC panel in turn and feedback is obtained.

[0064] In this embodiment, if Figure 3 As shown, the remote control system sends the diesel engine propulsion mode request signal to the DC panel and the steering propeller, the DC panel gives the diesel engine propulsion mode permission signal to the remote control, and the steering propeller gives the diesel engine propulsion mode permission signal to the remote control.

[0065] Step 7: Transfer the handle speed control authority to the diesel engine.

[0066] Step 8: Use the control handle to adjust the speed of the host and combine the power.

[0067] In this embodiment, the mode switching conditions are met, the diesel engine propulsion mode button indicator light is always on, and the handle can be used to adjust the diesel engine speed, starting from zero and pushing the speed up. When the handle exceeds the 5% range, the clutch is engaged.

[0068] In a specific embodiment, the mode switching fails: the interlocking conditions are not met, the diesel engine propulsion mode button indicator light flashes for more than 5 seconds, a fault is reported, and the reason for the mode switching failure is transmitted to the DC panel, and the display screen on the driving console shows the reason for the mode switching failure.

[0069] An embodiment of the present invention provides a power source input control method for a hybrid electric vessel. For lithium battery propulsion mode, data is first collected from each lithium battery in the battery pack to determine whether any unusable batteries are present. Before switching modes, the system status is evaluated to determine whether the conditions for the mode switch are met. After the mode switch is executed, if the mode switch fails, the reason for the failure is provided. This power source input control method enables smooth switching between lithium battery propulsion mode and diesel engine propulsion mode for hybrid electric vessels.

[0070] As an optional implementation, it also includes:

[0071] When the ship is in the diesel engine propulsion mode, if it is to be switched to the lithium battery propulsion mode, it is again determined whether the lithium battery propulsion mode switching conditions are met.

[0072] In this embodiment, if Figure 4 As shown, when the diesel engine propulsion mode is running, the diesel engine propulsion mode button indicator light is on. Pull the handle to 0, press the lithium battery propulsion mode button, and the remote control system determines the preconditions. The remote control sends the lithium battery propulsion mode (PTH) request signal to the DC panel and the steering propeller. The DC panel (the DC panel internally detects the motor standby signal and the inverter is not in working state) gives the lithium battery propulsion mode permission signal to the remote control, and the steering propeller (the steering propeller detects that the clutch is in the split mode) gives the lithium battery propulsion mode permission signal to the remote control. Mode conversion is successful: the lithium battery propulsion mode button indicator light is on, and the handle speed control authority is transferred to the motor. Press the motor start button and use the handle to adjust its speed. Mode conversion fails: the diesel engine mode is maintained, and the handle speed control authority is still the diesel engine.

[0073] In a specific embodiment, Figure 5 As shown, the lithium battery propulsion mode is switched to the diesel engine propulsion mode:

[0074] When the lithium battery propulsion mode is running, the lithium battery propulsion mode button indicator light is on;

[0075] The crew starts the diesel engine first, and the clutch should be in the split state;

[0076] Pull the handle to zero position and press the diesel engine propulsion mode button.

[0077] The remote control system first determines whether the diesel engine is in the ready state, the handle is in the zero position, and the clutch is in the spread state. If these conditions are met, a diesel engine propulsion mode switch request signal is sent to the rudder propeller. If these conditions are not met, the mode switch fails.

[0078] The steering propeller first receives the diesel engine propulsion mode switch request signal, and then sends the diesel engine propulsion mode permission signal. If the diesel engine propulsion mode permission signal given by the steering propeller is not received within 2S, the mode switch fails.

[0079] The remote control receives the diesel engine propulsion mode enable signal from the propeller and issues a VFD shutdown signal to shut down the VFD. The VFD then issues a diesel engine mode request signal to the DC panel. The DC panel receives the diesel engine propulsion mode request signal and then determines the relevant conditions for mode establishment. For example, if the VFD is in a non-operating state, if the conditions are met, it issues a mode enable signal to the remote control. If the DC panel does not issue a diesel engine propulsion mode enable signal within 2 seconds, the mode conversion fails.

[0080] Successful mode transition: The diesel engine propulsion mode button indicator lights steadily, and the joystick speed control authority is transferred to the diesel engine. Main engine speed control and combined transmission can be controlled via the joystick. When combined transmission and the diesel engine speed exceeds 405 rpm, the generator mode (PTO) power generation function automatically starts, the corresponding indicator lights up, and the shaft generator inverter starts, feeding generator energy into the DC bus. The DC bus system automatically determines the generated power based on the situation. If power generation is no longer required, press the generator mode (PTO) stop button.

[0081] If the mode conversion fails, the lithium battery propulsion mode will be maintained and the speed control authority of the handle will still be the motor.

[0082] As an optional implementation, an automatic mode is also included:

[0083] The lithium battery pack, backup generator set, closing, grid connection and disconnection are all automatically calculated and executed by the power management system PMS according to the load rate and control logic;

[0084] The power management system prioritizes operation in pure battery mode; in pure battery mode, all lithium battery packs are started to supply power; the power management system monitors the dynamic changes of power station power in real time; when the state of charge of all lithium battery packs is greater than or equal to 20%, the power management system keeps the lithium battery packs in discharge operation; when the average state of charge of all lithium battery packs is less than 20%, the power management system automatically starts the backup generator set to supply power and uses the excess energy of the backup generator to charge the lithium battery packs.

[0085] In this embodiment, the PMS also implements energy recovery and alarm functions. When the ship brakes suddenly, energy flows back into the DC bus system, which the PMS recycles to charge the lithium battery pack, achieving efficient energy utilization.

[0086] When the ship brakes suddenly, the propeller torque is greater than the motor torque. During emergency braking, the motor and propeller torques are equal, and the propeller drives the motor to rotate. At this time, the motor becomes a generator, and the energy generated will flow back to the DC bus system. The PMS will recycle this energy to charge the lithium battery pack. At this time, the remaining power of the lithium battery pack will increase, realizing efficient energy utilization.

[0087] As an optional implementation, a manual mode is also included:

[0088] The start and stop of the equipment can be manually controlled through the generator set control panel and the lithium battery pack control panel. After starting and stopping, the generator set and lithium battery pack will automatically connect to the grid or disconnect from the grid. Power distribution is performed by the power management system.

[0089] The charging, discharging and stopping of the lithium battery pack are controlled by the selection switch on the lithium battery pack control panel.

[0090] Although the embodiments of the present invention have been described with reference to the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention. Such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A method for controlling the power source input of a dual-drive ship, characterized in that: include: Determine whether the corresponding lithium battery is put into use according to the usage status of the lithium battery; Determine whether the lithium battery propulsion mode switching conditions are met based on the working status of the DC panel and the rudder propeller; If the lithium battery propulsion mode switching condition is met, the switching is performed and a lithium battery propulsion mode switching success signal is fed back; Transfer the handle speed control authority to the motor; When the ship is in lithium battery propulsion mode, if it is to be switched to diesel engine propulsion mode, it is determined whether the diesel engine propulsion mode switching conditions are met according to the working status of the diesel engine, the handle and the clutch; If the diesel engine propulsion mode switching condition is met, a diesel engine propulsion mode switching request signal is sent to the rudder propeller, the frequency converter and the DC panel in sequence and feedback is obtained; Transferring the handle speed regulation authority to the diesel engine; The main engine speed regulation and merging are achieved by controlling the handle; The lithium battery propulsion mode switching conditions include: the DC panel detects the motor standby signal and the inverter is in the non-working state; the rudder propeller detects that the clutch is in the split-row mode; The diesel engine propulsion mode switching conditions include: the DC panel detects that the inverter is in an inoperative state; the handle of the rudder propeller is in zero position; the clutch is in a shift state; the diesel engine is in a running state; It also includes an automatic mode: the power management system automatically calculates and executes the lithium battery pack, backup generator set, closing, grid connection and disconnection according to the load rate and control logic; wherein, the power management system preferentially operates in pure battery mode; the pure battery mode starts all the lithium battery packs to supply power; the power management system monitors the dynamic changes of the power station in real time; when the state of charge of all the lithium battery packs is greater than or equal to 20%, the power management system keeps the lithium battery packs in discharge operation; when the average state of charge of all the lithium battery packs is less than 20%, the power management system automatically starts the backup generator set to supply power and uses the excess energy of the backup generator to charge the lithium battery packs; It also includes a manual mode: the start and stop of the equipment can be manually controlled through the generator set control panel and the lithium battery pack control panel; after starting and stopping, the generator set and the lithium battery pack are automatically connected to the grid or disconnected; power distribution is performed by the power management system; the charging, discharging and stopping of the lithium battery pack are controlled by the selection switch on the lithium battery pack control panel.

2. The power source input control method for a hybrid ship according to claim 1, characterized in that: Also includes: When the ship is in the diesel engine propulsion mode, if it is to be switched to the lithium battery propulsion mode, it is determined again whether the lithium battery propulsion mode switching condition is met.

3. The power source input control method for a hybrid ship according to claim 1, characterized in that: Determining whether the corresponding lithium battery is put into use according to the lithium battery usage status includes: Obtain all lithium battery cell terminal voltages, lithium battery cluster operating currents, lithium battery temperatures, ambient humidity, fault alarms, and maximum allowable charge and discharge current values; Calculating the state of charge of the lithium battery; Determining whether the corresponding lithium battery meets usage requirements according to the state of charge; Determine whether the various parameters of the lithium battery are within safe values.

4. The power source input control method for a hybrid ship according to claim 3, characterized in that: The conditions for putting the lithium battery into use are set as follows: the state of charge of the lithium battery is greater than 20%; the humidity of the lithium battery is less than 70%; and the temperature of the lithium battery is between 5°C and 30°C.

5. The power source input control method for a hybrid ship according to claim 2, characterized in that: The diesel engine propulsion modes include: When the clutch is engaged by controlling the handle and the speed is greater than 405 rpm, the generator mode power generation function is automatically started; the shaft-generator inverter is started and the energy of the generator is input into the DC bus; When the handle is pulled back to zero position, the generator mode power generation function is automatically stopped, or when the power generation mode stop button is pressed, the shaft-generator inverter stops, the generator stops providing energy and is disconnected from the DC bus.

6. The power source input control method for a hybrid ship according to claim 1, characterized in that: Also includes: If no feedback of a mode switching permission signal is received within 2 seconds after the diesel engine propulsion mode switching request signal is sent, it is determined that the mode switching has failed.

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