Redundancy control electric propulsion system

Abstract

The utility model relates to a redundancy control electric propulsion system, which is characterized in that an emergency propulsion control module is additionally arranged on the basis of an original conventional propulsion control module, so that redundancy of a power control system is realized, and the problem that under the existing mode, a single system of the propulsion system is non-independent, so that the propulsion system is not independent when an emergency situation occurs on a ship is solved. The system solves the problem that the prior art cannot well achieve the operation function under the emergency condition, and achieves the effect that the system can still carry out the emergency operation under the condition that a communication or control module breaks down through the control thought that a program communication control scheme and a hard wire switching value and analog quantity control scheme are combined.

Description

Technical Field

[0001] This utility model relates to the field of ship propulsion technology, specifically to a redundant control electric propulsion system. Background Technology

[0002] A battery is a device that converts chemical energy into electrical energy. It contains an electrolyte solution and metal electrodes, forming a cup, tank, or other container or composite container that generates an electric current. It has a positive and a negative electrode. With technological advancements, the term "battery" now generally refers to any small device that generates electrical energy, such as a solar cell. The main performance parameters of a battery are electromotive force, capacity, and resistance. Using batteries as an energy source provides a stable voltage, stable current, long-term stable power supply, and minimal susceptibility to external influences. Batteries are also simple in structure, portable, easy to charge and discharge, unaffected by external climate and temperature, and offer stable and reliable performance, playing a significant role in various aspects of modern life.

[0003] With increasingly stringent environmental protection requirements, traditional fuel-powered ships can no longer meet the demands. As a result, new energy and environmentally friendly solutions using lithium iron phosphate batteries as ship power sources are being applied more and more frequently. However, existing lithium iron phosphate batteries used as ship power sources only have one control system. In case of emergencies on board, they cannot effectively perform emergency operations and lack redundant control. When the conventional control system malfunctions, the ship will lose power and be unable to continue moving. Utility Model Content

[0004] This invention addresses the technical problems existing in the prior art by providing a redundant control electric propulsion system. Based on the original conventional control system, it adds an emergency redundant control system, which solves the problem that when the conventional control system fails, the ship will lose power and be unable to continue moving, thus improving the safety of the ship's power system.

[0005] The technical solution of this utility model to solve the above-mentioned technical problems is as follows:

[0006] A redundant control electric propulsion system includes a conventional propulsion control module 1, an emergency propulsion control module 2, a battery pack control system 3, an electric propulsion local control box 4, a battery pack system 5, and a propulsion system 6. The conventional propulsion control module 1 is connected to the electric propulsion local control box 4 via a CAN / MODBUS communication line. The emergency propulsion control module 2 is connected to the electric propulsion local control box 4 via a hard-wired signal line. The electric propulsion local control box 4 is connected to the propulsion system 6 via a hard-wired signal line. The battery pack control system 3 is connected to the propulsion system 6 through the battery pack system 5.

[0007] In normal mode, the conventional propulsion control module 1 sends a first control command to the electric propulsion local control box 4, and the electric propulsion local control box 4 performs process control on the propulsion system 6 according to the first control command;

[0008] In emergency mode, the emergency propulsion control module 2 sends a second control command to the electric propulsion local control box 4, and the electric propulsion local control box 4 performs process control on the propulsion system 6 according to the second control command;

[0009] The battery pack control system 3 controls the battery pack system 5 to supply power to the propulsion system 6 based on the first control command or the second control command.

[0010] Based on the above technical solution, the present invention can be further improved as follows.

[0011] Preferably, the conventional propulsion control module 1 includes: a propulsion control panel, a propulsion handle, and a PLC system control box. The propulsion control panel is connected to the PLC system control box via a CAN / MODBUS communication line. The propulsion handle is connected to the PLC system control box via a hard-wired signal line. The PLC system control box is connected to the electric propulsion local control box 4 and the battery pack control system 3 via CAN / MODBUS communication lines, respectively.

[0012] The propulsion control panel is used to send the propulsion parameters set by the user to the PLC system control box, and to receive and display the battery fault alarm sent by the battery pack control system 3.

[0013] The push handle is used to send a third push control command to the PLC system control box by sending a hard-wire signal;

[0014] The PLC system control box is used to generate the first control command based on the propulsion parameters and the third propulsion control command, and send the first control command to the electric propulsion local control box 4.

[0015] Preferably, the emergency propulsion control module 2 includes an emergency operation control board, which is connected to the electric propulsion local control box 4 via a hard-wired signal line.

[0016] Preferably, the battery pack control system 3 includes a battery system control board, which is connected to the battery pack system 5 and the conventional propulsion control module 1 via CAN / MODBUS communication lines.

[0017] Preferably, the battery pack system 5 includes a first lithium battery high-voltage box, a first local switch, a first lithium battery pack, a second lithium battery high-voltage box, a second local switch, and a second lithium battery pack. The first lithium battery high-voltage box is connected to the first local switch, the first lithium battery pack, the battery pack control system 3, and the propulsion system 6, respectively. The second lithium battery high-voltage box is connected to the second local switch, the second lithium battery pack, the battery pack control system 3, and the propulsion system 6, respectively.

[0018] The first local switch is used to disconnect the power to the first lithium battery pack in the event of a failure in the first lithium battery pack.

[0019] The second local switch is used to disconnect the power to the second lithium battery pack in the event of a failure in the second lithium battery pack.

[0020] Preferably, the propulsion system 6 includes a first propulsion inverter control cabinet, a first propulsion motor, a second propulsion inverter control cabinet, and a second propulsion motor. The first propulsion inverter control cabinet is connected to the electric propulsion local control box 4, the first lithium battery high-voltage box, and the first propulsion motor, respectively. The second propulsion inverter control cabinet is connected to the electric propulsion local control box 4, the second lithium battery high-voltage box, and the second propulsion motor, respectively.

[0021] Preferably, the first propulsion inverter control cabinet includes a first current pre-charging circuit and a first inverter, and the first lithium battery high-voltage box is connected to the first propulsion motor in sequence through the first current pre-charging circuit and the first inverter.

[0022] Preferably, the second propulsion inverter control cabinet includes a second current pre-charging circuit and a second inverter, and the second lithium battery high-voltage box is connected to the second propulsion motor in sequence through the second current pre-charging circuit and the second inverter.

[0023] Preferably, the propulsion system 6 further includes a bus tie control box, which includes a third current pre-charging circuit. The bus tie control box is connected to the first propulsion inverter control cabinet, the second propulsion inverter control cabinet, the first lithium battery high-voltage box, and the second lithium battery high-voltage box, respectively.

[0024] The bus control box is used to supply power to the first propulsion motor and the second propulsion motor using a fault-free lithium battery pack when the first lithium battery pack or the second lithium battery pack fails.

[0025] Preferably, the first lithium battery pack and the second lithium battery pack are lithium iron phosphate batteries.

[0026] The beneficial effects of this utility model are as follows: The redundant control electric propulsion system of this utility model achieves redundancy in the power control system by adding an emergency propulsion control module to the original conventional propulsion control module. This solves the problem that in the existing mode, due to the non-independent nature of the propulsion system as a single system, the system cannot effectively perform emergency operation functions when an emergency occurs on board. Furthermore, by combining a program communication control scheme with hard-wired switch and analog control schemes, the system can still perform emergency operations even in the event of a communication or control module failure. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall principle of this utility model;

[0028] Figure 2 This is a structural diagram of the propulsion system of this utility model;

[0029] Figure 3 This is a schematic diagram of the overall structure of the redundant control electric propulsion system of this utility model. Detailed Implementation

[0030] The principles and features of this utility model are described below with reference to the accompanying drawings. The examples given are only for explaining this utility model and are not intended to limit the scope of this utility model.

[0031] This embodiment provides a redundant control electric propulsion system, such as... Figure 1 As shown in the principle block diagram, the redundant control electric propulsion system includes a conventional propulsion control module 1, an emergency propulsion control module 2, a battery pack control system 3, an electric propulsion local control box 4, a battery pack system 5, and a propulsion system 6. The conventional propulsion control module 1 is connected to the electric propulsion local control box 4 via a CAN / MODBUS communication line. The emergency propulsion control module 2 is connected to the electric propulsion local control box 4 via a hard-wired signal line. The electric propulsion local control box 4 is connected to the propulsion system 6 via a hard-wired signal line. The battery pack control system 3 is connected to the propulsion system 6 through the battery pack system 5.

[0032] In the conventional mode, the conventional propulsion control module 1 sends a first control command to the electric propulsion local control box 4, and the electric propulsion local control box 4 performs process control on the propulsion system 6 according to the first control command. In the emergency mode, the emergency propulsion control module 2 sends a second control command to the electric propulsion local control box 4, and the electric propulsion local control box 4 performs process control on the propulsion system 6 according to the second control command. The battery pack control system 3 controls the battery pack system 5 to supply power to the propulsion system 6 based on the first control command or the second control command.

[0033] In this embodiment, an emergency propulsion control module is added to the existing conventional propulsion control module, thereby achieving redundancy in the power control system. This solves the problem that, under the existing model, due to the non-independent nature of the propulsion system as a single system, the system cannot effectively perform emergency operation functions when an emergency occurs on board. Furthermore, by combining a program communication control scheme with hard-wired switch and analog control schemes, the system can still perform emergency operations even in the event of a communication or control module failure.

[0034] Based on the above technical solution, the present invention can be further improved as follows.

[0035] In one possible embodiment, the conventional propulsion control module 1 includes: a propulsion control panel, a propulsion handle, and a PLC system control box. The propulsion control panel is connected to the PLC system control box via a CAN / MODBUS communication line, the propulsion handle is connected to the PLC system control box via a hard-wired signal line, and the PLC system control box is connected to the electric propulsion local control box 4 and the battery pack control system 3 via CAN / MODBUS communication lines.

[0036] The propulsion handle is used to send a third propulsion control command to the PLC system control box by sending a hard-wired signal; the PLC system control box is used to generate the first control command based on the propulsion parameters and the third propulsion control command, and send the first control command to the electric propulsion local control box 4.

[0037] Furthermore, the emergency propulsion control module 2 includes an emergency operation control board, which is connected to the electric propulsion local control box 4 via a hard-wired signal line.

[0038] Furthermore, the battery pack control system 3 includes a battery system control board, which is connected to the battery pack system 5 and the conventional propulsion control module 1 via CAN / MODBUS communication lines.

[0039] In this embodiment, relevant parameters of the battery pack can be sent to the propulsion system via a communication interface. The propulsion system then sets relevant alarms based on these parameters (such as battery charge, battery voltage, and battery temperature) to ensure the propulsion system operates under normal battery conditions. The battery system also has an independent control panel that can display and set its parameters. Even if the propulsion system malfunctions, the display and setting functions of the control panel remain unaffected.

[0040] Furthermore, the battery pack system 5 includes a first lithium battery high-voltage box, a first local switch, a first lithium battery pack, a second lithium battery high-voltage box, a second local switch, and a second lithium battery pack. The first lithium battery high-voltage box is connected to the first local switch, the first lithium battery pack, the battery pack control system 3, and the propulsion system 6, respectively. The second lithium battery high-voltage box is connected to the second local switch, the second lithium battery pack, the battery pack control system 3, and the propulsion system 6, respectively.

[0041] The first local switch is used to disconnect the power to the first lithium battery pack when the first lithium battery pack fails; the second local switch is used to disconnect the power to the second lithium battery pack when the second lithium battery pack fails.

[0042] Furthermore, the first lithium battery pack and the second lithium battery pack can be lithium iron phosphate batteries.

[0043] In this embodiment, corresponding local emergency stop buttons are set in the two sets of lithium batteries to ensure that when an accident or malfunction is found in one of the sets of lithium batteries, the power can be cut off in time through the emergency stop button, thereby ensuring the safety of the ship's power supply system.

[0044] Furthermore, the propulsion system 6 includes a first propulsion inverter control cabinet, a first propulsion motor, a second propulsion inverter control cabinet, and a second propulsion motor. The first propulsion inverter control cabinet is connected to the electric propulsion local control box 4, the first lithium battery high-voltage box, and the first propulsion motor, respectively. The second propulsion inverter control cabinet is connected to the electric propulsion local control box 4, the second lithium battery high-voltage box, and the second propulsion motor, respectively.

[0045] Furthermore, the first propulsion inverter control cabinet includes a first current pre-charging circuit and a first inverter, and the first lithium battery high-voltage box is connected to the first propulsion motor in sequence through the first current pre-charging circuit and the first inverter.

[0046] Furthermore, the second propulsion inverter control cabinet includes a second current pre-charging circuit and a second inverter, and the second lithium battery high-voltage box is connected to the second propulsion motor in sequence through the second current pre-charging circuit and the second inverter.

[0047] Furthermore, the propulsion system 6 also includes a bus tie control box, which includes a third current pre-charging circuit. The bus tie control box is connected to the first propulsion inverter control cabinet, the second propulsion inverter control cabinet, the first lithium battery high-voltage box, and the second lithium battery high-voltage box, respectively.

[0048] The bus control box is used to supply power to the first propulsion motor and the second propulsion motor using a fault-free lithium battery pack when the first lithium battery pack or the second lithium battery pack fails.

[0049] See Figure 2 ,exist Figure 2 In order to further ensure the safety of the battery pack's power supply to the propulsion system, considering that there are capacitors inside the frequency converter, if the capacitors inside the frequency converter are in a zero state before power-on, that is, there is no energy in the capacitors, then at the moment the circuit is closed, it is equivalent to a direct short circuit, and the current is very large. To prevent the frequency converter current from being too large when powered on, current pre-charging circuits are set in the frequency converter control cabinet and the bus tie control box, thereby further improving the safety of power supply.

[0050] In practice, the bus coupler control box is used to supply power to both propulsion inverters and propulsion motors when one of the two sets of lithium batteries fails, thus ensuring that the ship can continue to sail with the power supply of the other set of batteries even if one set of batteries fails.

[0051] Furthermore, the bus tie control box employs a pre-charge design structure to address the issue of excessive current when the inverter and capacitive loads are connected. When power needs to be supplied to the second propulsion motor from the first battery pack via the bus tie control cabinet, the bus tie control cabinet first connects K2. Due to the current-limiting effect of the resistor in the branch where K2 is located, the initial current will be limited. After the capacitor is fully charged, K1 is then connected, and K2 is disconnected. At this time, the current transitions to normal levels, thus achieving the current pre-charge effect for capacitive loads.

[0052] In one possible application scenario, see Figure 3 , Figure 3 This is a schematic diagram of the overall structure of the electric propulsion system with redundant control according to this utility model. Figure 3 In the system, the No. 1 and No. 2 propulsion inverter control cabinets communicate with the local electric propulsion control box via hard-wired signal lines, transmitting and receiving signals including digital and analog signals. The local electric propulsion control box can directly control the inverters in the No. 1 and No. 2 propulsion inverter control cabinets, enabling inverter control of the propulsion motors. The local electric propulsion control box is also connected to the emergency operation control board in the driver's cab via hard-wired connections. Furthermore, the local electric propulsion control box communicates with the PLC system control box via CAN / MODBUS communication lines. The PLC system control box is connected to the propulsion handle on the driver's cab via signal lines containing digital and analog signals, and simultaneously connected to the propulsion control board on the driver's cab via CAN / MODBUS communication lines.

[0053] During normal operation, the operator communicates with the PLC communication module in the PLC system control box via the propulsion handle and propulsion control board on the cab. According to the corresponding propulsion program on the PLC, the operator communicates with the local electric propulsion control box, transmitting the action commands in the program to the local electric propulsion control box via the CAN / MODBUS communication line. After receiving the commands via the CAN / MODBUS communication line, the local electric propulsion control box sends the commands in digital and analog form to the corresponding propulsion inverter control cabinet through the corresponding digital and analog modules, ultimately realizing the control process of the propulsion motor.

[0054] In an emergency, if the PLC system control box is damaged due to a malfunction, the propulsion control board connected to the PLC system control box on the operator's cab will become unusable. Simultaneously, the control system connected to the local electric propulsion control box via the CAN / MODBUS communication line will also fail. However, the local electric propulsion control box, the electric propulsion inverter control cabinet, and the emergency operation controls on the operator's cab are all connected via hardwired connections and are unaffected by the PLC system control box damage. Operation can be performed directly from the emergency operation panel on the operator's cab or directly from the panel of the local electric propulsion control box.

[0055] Working principle:

[0056] The redundant control electric propulsion system provided in this embodiment adds an emergency redundant control system to the existing conventional control system. This achieves a control approach that combines programmed communication control with hard-wired switching and analog control schemes, enabling the system to still perform emergency operations even in the event of communication or control module failure. Simultaneously, emergency stop buttons are used in both battery packs to ensure timely power cut-off in the event of an accident or malfunction in one of the lithium battery packs, improving the safety of the ship's power supply system. Furthermore, through the control of the bus tie control box, it is ensured that if one of the two lithium battery packs fails, the fault-free lithium battery pack can still supply power to the two propulsion inverters and propulsion motors, further enhancing the safety of emergency ship operations in case of failure.

[0057] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A redundant control electric propulsion system, characterized in that, include: The system comprises a conventional propulsion control module (1), an emergency propulsion control module (2), a battery pack control system (3), an electric propulsion local control box (4), a battery pack system (5), and a propulsion system (6). The conventional propulsion control module (1) is connected to the electric propulsion local control box (4) via a CAN / MODBUS communication line. The emergency propulsion control module (2) is connected to the electric propulsion local control box (4) via a hard-wired signal line. The electric propulsion local control box (4) is connected to the propulsion system (6) via a hard-wired signal line. The battery pack control system (3) is connected to the propulsion system (6) via the battery pack system (5). In the normal mode, the conventional propulsion control module (1) sends a first control command to the electric propulsion local control box (4), and the electric propulsion local control box (4) performs process control on the propulsion system (6) according to the first control command; In emergency mode, the emergency propulsion control module (2) sends a second control command to the electric propulsion local control box (4), and the electric propulsion local control box (4) performs process control on the propulsion system (6) according to the second control command; The battery pack control system (3) controls the battery pack system (5) to supply power to the propulsion system (6) based on the first control command or the second control command.

2. The electric propulsion system with redundant control according to claim 1, characterized in that, The conventional propulsion control module (1) includes: a propulsion control panel, a propulsion handle and a PLC system control box. The propulsion control panel is connected to the PLC system control box via a CAN / MODBUS communication line. The propulsion handle is connected to the PLC system control box via a hard-wired signal line. The PLC system control box is connected to the electric propulsion local control box (4) and the battery pack control system (3) via a CAN / MODBUS communication line. The propulsion control panel is used to send the propulsion parameters set by the user to the PLC system control box, and to receive and display the battery fault alarm sent by the battery pack control system (3). The push handle is used to send a third push control command to the PLC system control box by sending a hard-wire signal; The PLC system control box is used to generate the first control command based on the propulsion parameters and the third propulsion control command, and send the first control command to the electric propulsion local control box (4).

3. The electric propulsion system with redundant control according to claim 1, characterized in that, The emergency propulsion control module (2) includes an emergency operation control board, which is connected to the electric propulsion local control box (4) based on hard-wired signal lines.

4. The electric propulsion system with redundant control according to claim 1, characterized in that, The battery pack control system (3) includes a battery system control board, which is connected to the battery pack system (5) and the conventional propulsion control module (1) via CAN / MODBUS communication lines.

5. The electric propulsion system with redundant control according to claim 1, characterized in that, The battery pack system (5) includes a first lithium battery high-voltage box, a first local switch, a first lithium battery pack, a second lithium battery high-voltage box, a second local switch, and a second lithium battery pack. The first lithium battery high-voltage box is connected to the first local switch, the first lithium battery pack, the battery pack control system (3), and the propulsion system (6), respectively. The second lithium battery high-voltage box is connected to the second local switch, the second lithium battery pack, the battery pack control system (3), and the propulsion system (6), respectively. The first local switch is used to disconnect the power to the first lithium battery pack in the event of a fault in the first lithium battery pack. The second local switch is used to disconnect the power to the second lithium battery pack in the event of a failure in the second lithium battery pack.

6. The electric propulsion system with redundancy control according to claim 5, characterized in that, The propulsion system (6) includes a first propulsion inverter control cabinet, a first propulsion motor, a second propulsion inverter control cabinet, and a second propulsion motor. The first propulsion inverter control cabinet is connected to the electric propulsion local control box (4), the first lithium battery high-voltage box, and the first propulsion motor, respectively. The second propulsion inverter control cabinet is connected to the electric propulsion local control box (4), the second lithium battery high-voltage box, and the second propulsion motor, respectively.

7. The electric propulsion system with redundancy control according to claim 6, characterized in that, The first propulsion inverter control cabinet includes a first current pre-charging circuit and a first inverter. The first lithium battery high-voltage box is connected to the first propulsion motor in sequence through the first current pre-charging circuit and the first inverter.

8. The electric propulsion system with redundancy control according to claim 6, characterized in that, The second propulsion inverter control cabinet includes a second current pre-charging circuit and a second inverter. The second lithium battery high-voltage box is connected to the second propulsion motor in sequence through the second current pre-charging circuit and the second inverter.

9. The electric propulsion system with redundancy control according to claim 6, characterized in that, The propulsion system (6) also includes a bus tie control box, which includes a third current pre-charging circuit. The bus tie control box is connected to the first propulsion inverter control cabinet, the second propulsion inverter control cabinet, the first lithium battery high-voltage box, and the second lithium battery high-voltage box, respectively. The bus control box is used to supply power to the first propulsion motor and the second propulsion motor using a fault-free lithium battery pack when the first lithium battery pack or the second lithium battery pack fails.

10. The electric propulsion system with redundancy control according to claim 5, characterized in that, The first lithium battery pack and the second lithium battery pack are lithium iron phosphate batteries.

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