Pylon flexible power supply and power-off self-rescue electrical system and method for a traffic boat

Abstract

The application discloses a corridor bridge flexible power supply and power-off self-rescue electrical system and method for a traffic boat, belongs to the technical field of offshore wind power operation and maintenance, and first introduces a micro-grid architecture of "supercapacitor+active front end" in a post-installed corridor bridge system, realizes "peak load shifting" flexible power taking of the traffic boat power grid, and discards a rigid power taking mode of a traditional ship generator directly dragging a corridor bridge hydraulic motor, and innovatively constructs an independent direct-current micro-grid with composite energy storage under an "AC-DC-AC" frequency conversion architecture. Through active front end control, supercapacitor transient peak load shifting, wave gravity potential energy inversion recovery, and a hardware-level island self-rescue mechanism under a whole-ship power failure state, the application gives the post-installed corridor bridge an independent survival and extremely fast escape ability completely independent of the influence of the traffic boat power grid fluctuation.

Description

Technical Field

[0001] This invention belongs to the field of offshore wind power operation and maintenance technology, specifically relating to a flexible power supply and self-rescue electrical system and method for the boarding bridge of a transport vessel. Background Technology

[0002] In the field of offshore wind power operation and maintenance, installing small walkways with active wave compensation functions on transport boats without power positioning systems is a current mainstream trend to increase the boarding and departure rate. The transport boat rests against the wind turbine foundation through the bow buffer, relying on the static friction generated by the continuous output of huge thrust from the main engine to resist the up-and-down tearing of the waves.

[0003] However, when dealing with severe sea conditions, the hydraulic pump station motors of active wave-compensated boarding bridges need to frequently accelerate and decelerate rapidly, generating huge peak inrush currents. The ship's electrical grid capacity is typically very small, and the transient high load of the boarding bridge can easily lower the voltage of the entire ship's electrical grid, even causing the main switchboard to trip. Once the boarding bridge loses power, the main engine will instantly lose thrust, and the ship will slide directly down the wind turbine piles, causing the boarding bridge, which is currently in the process of being connected, to be instantly torn apart, resulting in a catastrophic accident. Summary of the Invention

[0004] The purpose of this invention is to provide a flexible power supply and self-rescue electrical system and method for the boarding bridge of a transport vessel, so as to overcome the technical problem of the coupling contradiction between the existing heavy-duty active wave-compensated boarding bridge and the weak ship electrical network.

[0005] To solve the above problems, the present invention adopts the following technical solution: The flexible power supply and self-rescue electrical system for the boarding bridge of a transport boat includes a high-frequency electrical isolation transformer, an active front-end rectifier module, a common DC busbar, a bidirectional inverter driver, and a hydraulic pump station main frequency converter motor connected in sequence. The common DC busbar is connected in parallel with a composite energy storage array. It also includes a microgrid energy dispatch central controller, the output of which is connected to the input signals of the active front-end rectifier module, the bidirectional inverter driver and the main frequency converter motor of the hydraulic pump station, respectively. The input terminals of the high-frequency electrical isolation transformer and the microgrid energy dispatch central controller are respectively connected to the basic AC power supply network of the transport boat. The output of the microgrid energy dispatch central controller is also connected to the bottom hydraulic valve island.

[0006] Furthermore, the composite energy storage array includes a supercapacitor bank and a lithium titanate battery bank connected in parallel.

[0007] Furthermore, the active front-end rectifier module employs pulse width modulation technology to control the current waveform extracted from the main power distribution board of the transport boat into a sine wave.

[0008] Furthermore, the microgrid energy dispatch central controller has a built-in grid monitoring module, which is used to monitor the AC input voltage of the transport boat.

[0009] Secondly, a flexible power supply and self-rescue electrical control method for the boarding bridge of a transport boat is provided, including the following steps: The microgrid energy dispatch central controller reads the current remaining available power limit of the transport boat in real time via the communication bus. ; When the transient mechanical power generated by the hydraulic system of the covered bridge At that time, the peak-shaving discharge logic is triggered, and the microgrid energy dispatch central controller instructs the active front-end rectifier module to maintain a constant power output. The output is filled by the instantaneous natural discharge of the composite energy storage array connected in parallel to the common DC bus; When the waves enter a period of calm, that is When the valley filling charging logic is triggered, the active front-end rectifier module continues to operate at a constant power. Power is drawn from the transport boat, and surplus power automatically flows into the common DC bus to smoothly recharge the composite energy storage array.

[0010] Furthermore, it also includes energy recovery steps: During the wave compensation cycle, when the transport boat is lifted by the surging waves or the main arm of the boardwalk is forced to descend under its own weight and wave thrust, the hydraulic cylinder generates a reverse high-pressure backflow, which forces the hydraulic pump to be reverse-driven and converted into a hydraulic motor mode, thereby dragging the hydraulic pump station motor into the power generation quadrant in the reverse direction; the bidirectional inverter driver rectifies the AC power generated by the motor into smooth DC power, injects it in reverse into the common DC bus, and is absorbed and stored by the composite energy storage array.

[0011] Furthermore, it also includes self-rescue steps in the event of a power outage: The grid monitoring module of the microgrid energy dispatch central controller monitors the AC input voltage of the transport boat in real time. When it is determined that the transport boat has lost power, it immediately blocks the trigger pulse of the active front-end rectifier module, cuts off the connection with the paralyzed power grid of the transport boat at the physical and electrical level, and switches to the composite energy storage array connected in parallel with the common DC bus to continue power supply.

[0012] Furthermore, the power failure self-rescue steps also include a hard-wired bypass mechanism: When the microgrid energy dispatch central controller detects a power outage or internal bus communication failure, it sends high-level analog / digital pulses directly to the unloading valve and lifting valve of the hydraulic valve island through the underlying FPGA or safety relay, forcibly opening the hydraulic oil circuit for physical escape.

[0013] Furthermore, the supercapacitor bank of the composite energy storage array is responsible for responding to wave compensation peak smoothing and valley filling. The lithium titanate battery pack is responsible for maintaining the system's basic static power consumption and providing minutes of battery life in islanded mode.

[0014] Furthermore, the power gap is the difference between the transient mechanical power generated by the bridge's hydraulic system and the upper limit of the current remaining available power of the transport boat.

[0015] Compared with the prior art, the present invention has the following beneficial technical effects: This invention provides a flexible power supply and self-rescue electrical system for the boarding bridge of a transport boat. It aims to completely resolve the coupling contradiction between a heavily loaded, actively wave-compensated boarding bridge and a weak shipboard electrical grid from both physical architecture and control algorithm perspectives. It abandons the traditional rigid power extraction mode of directly driving the boarding bridge's hydraulic motor using ship generators, and innovatively constructs an independent DC microgrid with composite energy storage under an AC-DC-AC frequency converter architecture. Through active front-end control, transient peak shaving and valley filling using supercapacitors, wave gravity potential energy inversion and recovery, and a hardware-level islanding self-rescue mechanism in the event of a complete shipboard power outage, it endows the boarding bridge with independent survival and rapid escape capabilities, completely detached from the fluctuations in the transport boat's electrical grid.

[0016] For the first time, a microgrid architecture of supercapacitors and active front-end was introduced into the retrofitted boarding bridge system, realizing flexible power extraction for the transport boat's power grid by peak shaving and valley filling. More importantly, it endowed the boarding bridge with the ability to achieve zero-millisecond switching and autonomous rapid separation in the event of a complete power outage and loss of thrust on the transport boat, fundamentally eliminating the human-machine disaster caused by fluctuations in the transport boat's power grid.

[0017] This invention also provides an electrical control method for flexible power supply and self-rescue during power outages of transport boats' boarding bridges. Based on a dynamic peak-shaving and valley-filling method that uses real-time sensing of the transport boat's power grid margin, it dynamically acquires the ship's remaining available power and sets an active front-end power extraction threshold accordingly. Utilizing the natural charging and discharging characteristics of supercapacitors, it automatically replenishes power gaps or recharges surplus energy, ensuring the boarding bridge presents a constant and smooth load on the ship's power grid. This avoids peak current surges and achieves adaptive optimal matching of power extraction. Furthermore, through a wave potential energy four-quadrant inverter recovery method, it identifies hydraulic reverse flow conditions and actively rectifies and feeds back the electrical energy generated in the generator quadrant. The DC busbar converts the destructive force of waves, which would otherwise be dissipated as heat, into recyclable electrical energy, effectively reducing the average energy consumption of the system and the dependence on the ship's electrical grid. Through the zero-delay island self-rescue method in the event of a power outage, the system achieves seamless island switching of the heavy-duty hydraulic system through microsecond-level voltage drop detection and pulse physical cutoff. Combined with the unauthorized takeover logic and the pure hardware bypass triggering mechanism, the boarding bridge can be forcibly driven to lift and detach rapidly without relying on software and communication, ensuring that the escape is completed within the golden window before the transport boat falls. This fundamentally eliminates the risk of human-machine disaster caused by power outages during the boarding operation of the unpowered positioning transport boat. Attached Figure Description

[0018] Figure 1 This is a hardware topology diagram of a flexible power supply and self-rescue electrical system for a boarding bridge of a transport boat, as described in an embodiment of the present invention. Figure 2 This is a flowchart of the dynamic peak shaving and valley filling power extraction logic based on the power grid margin perception of the transportation boat; Figure 3 A schematic diagram of the state machine for rapid escape and self-rescue in the isolated island of the microgrid on the boarding bridge during a complete power outage disaster on a transport boat. Figure 4 A global operation flow diagram of the corridor bridge electrical system that integrates peak shaving and valley filling with power outage escape island mechanisms. Detailed Implementation

[0019] To make the technical problems solved by the present invention, the technical solutions, and the beneficial effects clearer, the following specific embodiments provide a further detailed description of the present invention. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of the invention.

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0021] In the description of the embodiments of the present invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention according to the specific circumstances.

[0022] A flexible power supply and self-rescue electrical system for the boarding bridge of a transport boat, such as Figure 1 As shown, the system consists of three main parts: the basic AC power grid for the transport boat, the gate bridge electrical and DC microgrid hub, and the gate bridge hydraulic power execution domain. The basic AC power grid for the transport boat includes the main generator set and the ship's main switchboard. The main generator set provides basic AC power for the entire ship, which is connected to the ship's main switchboard via AC high-voltage transmission lines, where the main switchboard distributes and manages the power. The input terminals of the gate bridge electrical and DC microgrid hub are connected to the basic AC power grid for the transport boat through the controlled AC high-voltage output terminals. The microgrid hub internally includes, in sequence: a high-frequency electrical isolation transformer, an active front-end rectifier module, a common DC bus, a composite energy storage array, and a microgrid energy dispatch central controller. The input of the high-frequency electrical isolation transformer is connected to the basic AC power grid of the transport boat to achieve physical isolation and harmonic blocking between the ship's electrical grid and the bridge microgrid. The active front-end rectifier module is connected between the high-frequency electrical isolation transformer and the common DC bus. It uses PWM rectification technology to convert AC to DC and control the input current to be a sine wave to prevent harmonic pollution. The common DC bus serves as the energy hub of the bridge microgrid and is connected in parallel to a composite energy storage array. The composite energy storage array consists of a supercapacitor bank and a lithium titanate battery bank connected in parallel. The supercapacitor bank is used to respond to high-frequency high-power pulses, while the lithium titanate battery bank is used to provide basic static power consumption and long-term endurance. The bridge hydraulic power execution domain includes a bidirectional inverter driver, a hydraulic pump station main frequency converter motor, and a bottom hydraulic valve island. One end of the bidirectional inverter driver is connected to the common DC bus, and the other end is connected to the main frequency converter motor of the hydraulic pump station. According to the instructions of the microgrid energy dispatch central controller, the bidirectional inverter driver converts DC power into AC power to drive the hydraulic pump station motor. The hydraulic pump station motor drives the hydraulic pump station to establish hydraulic pressure. The bottom hydraulic valve island controls the opening and closing of the hydraulic oil circuit according to the control signal to realize the extension and retraction control of the main boom of the corridor bridge.

[0023] Because the engine room of the transport boat is small and the generator capacity (usually in the range of tens to hundreds of kilowatts) is much smaller than the peak power required for instantaneous compensation of the boarding bridge (which can reach hundreds of kilowatts), the hardware architecture of this system adopts the design principle of "decoupling of strong and weak currents and central DC water storage tank". Figure 1A simplified diagram of the system hardware physical nodes is used to clearly illustrate the interrelationships between various electrical components, including: Active front-end rectifier module: Located between the isolation transformer and the common DC bus. It is subject to the instructions of the microgrid energy dispatch central controller and uses pulse width modulation (PWM) technology to force the current waveform drawn from the main distribution board of the transport boat to be a perfect sine wave, and locks the drawn power within an extremely low constant safety value, so as not to output any harmonic pollution to the power grid of the transport boat.

[0024] The common DC bus and the composite energy storage array form the energy reservoir of the corridor bridge. The supercapacitor bank has extremely high power density, responsible for handling hundreds or thousands of amperes of peak current in milliseconds; the lithium titanate battery provides energy density support, ensuring minutes of battery life after a power outage.

[0025] Bidirectional inverter driver: It is not only responsible for converting DC power into AC power to drive the hydraulic pump motor, but also, with the help of the reverse freewheeling diodes in its internal IGBT (Insulated Gate Bipolar Transistor) bridge arm, it can rectify the AC power back to DC power when the motor is passively reversed.

[0026] This invention also provides a flexible power supply and self-rescue electrical control method for the boarding bridge of a transport boat, comprising the following steps: The microgrid energy dispatch central controller reads the current remaining available power limit of the transport boat in real time via the communication bus. ; When the transient mechanical power generated by the hydraulic system of the covered bridge At that time, the peak-shaving discharge logic is triggered, and the microgrid energy dispatch central controller instructs the active front-end rectifier module to maintain a constant power output. The output is filled by the instantaneous natural discharge of the composite energy storage array connected in parallel to the common DC bus; When the waves enter a period of calm, that is When the valley filling charging logic is triggered, the active front-end rectifier module continues to operate at a constant power. Power is drawn from the transport boat, and surplus power automatically flows into the common DC bus to smoothly recharge the composite energy storage array.

[0027] Specifically, such as Figure 2 As shown, the microgrid energy dispatch central controller collects the current remaining available power limit of the traffic boat power management system in real time through the communication bus. When wave-induced vibration occurs, the hydraulic system of the covered bridge generates transient mechanical power demands. The microgrid energy dispatch central controller executes power game decision logic: if If this occurs, the peak-shaving discharge logic is triggered. At this time, the microgrid energy dispatch central controller forces the active front-end rectifier module to lock at a constant low power. The output refuses to draw more current from the transport boat's power grid; at this moment, the DC bus voltage experiences a slight drop due to the huge losses at the downstream end. According to Kirchhoff's current law, the supercapacitor bank connected in parallel to the DC bus instantly releases a large current naturally using its extremely low internal resistance, and the discharge power is exactly equal to the power gap. This achieves peak shaving protection for the power grid of the transport boat, ensuring that the load on the bridge that the generator of the transport boat "sees" is always a quiet straight line.

[0028] When the waves subside, the hydraulic pump station motor is in a low-load pressure-maintaining state, that is... At this time, the valley filling charging logic is triggered. The active front-end rectifier module continues to operate at a constant low power. Power is drawn from the power grid of the transport boat, with surplus power. The supercapacitor bank is automatically fed into the common DC bus to smoothly recharge itself, keeping it fully charged and ready to operate at all times, thus completing the valley filling.

[0029] Through this embodiment, the generator of the transport boat always sees a stable load curve without surges, completely avoiding the risk of the entire ship tripping due to transient large loads on the boardwalk.

[0030] In one embodiment of the present invention, an energy recovery step is also provided, specifically including: During the wave compensation cycle, when the transport boat is lifted by the surging waves or the main arm of the boardwalk is forced to descend under its own weight and wave thrust, the hydraulic cylinder generates a reverse high-pressure backflow, which forces the hydraulic pump to be reverse-driven and converted into a hydraulic motor mode, thereby dragging the hydraulic pump station motor into the power generation quadrant in the reverse direction; the bidirectional inverter driver rectifies the AC power generated by the motor into smooth DC power, injects it in reverse into the common DC bus, and is absorbed and stored by the composite energy storage array.

[0031] In detail, the marine operating environment contains enormous natural energy. This invention creatively transforms the physical destructive force of waves on the boardwalk into electrical energy to sustain the system, greatly reducing the dependence on the weak electrical grid of the transport boat.

[0032] During the wave compensation cycle, when the transport boat is lifted by the swell, or when the main boom of the boarding bridge is forced to descend under the combined action of its own weight and the thrust of the waves, the enormous mechanical pressure forces the hydraulic oil in the hydraulic cylinder to flow back to the hydraulic pump station at an extremely high velocity. At this time, the working state of the hydraulic system is reversed: the hydraulic pump changes from a "pump that outputs hydraulic oil" to a "hydraulic motor driven by high-pressure oil".

[0033] This "hydraulic motor" drives the main inverter motor to rotate in the reverse direction via a mechanical shaft, putting the motor into generator mode (the generator quadrant of four-quadrant operation). The stator windings cut magnetic field lines, generating chaotic three-phase alternating current. The bidirectional inverter driver captures this reverse electromotive force and, using its internal inverter topology, rectifies this alternating current into smooth, high-voltage direct current, which is then directly injected in reverse into the common DC bus. The supercapacitor bank instantly absorbs and stores all this recovered kinetic energy like a sponge, achieving efficient closed-loop self-circulation of energy within the bridge microgrid.

[0034] In another embodiment of the present invention, a power failure self-rescue step is also provided: The grid monitoring module of the microgrid energy dispatch central controller monitors the AC input voltage of the transport boat in real time. When it is determined that the transport boat has lost power, it immediately blocks the trigger pulse of the active front-end rectifier module, cuts off the connection with the paralyzed power grid of the transport boat at the physical and electrical level, and switches to the composite energy storage array connected in parallel with the common DC bus to continue power supply.

[0035] Detailed, such as Figure 3 As shown, for unpowered transport boats, once the entire vessel loses power and the main propulsion stops, the bow, which was originally firmly "attached" to the wind turbine's steel pipes, will instantly slip off under the influence of gravity and waves. If the boarding bridge cannot detach from the wind turbine within the critical 2-3 seconds before the transport boat crashes, the entire vessel will be destroyed and all lives on board will be lost. Traditional AC direct-drive boarding bridges will also lose power and become paralyzed along with the mother ship at this time, with no chance of survival.

[0036] The microgrid energy dispatch central controller's grid monitoring module monitors the AC input voltage of the transport boat in real time at a sampling rate of up to kilohertz. Once it is detected that the voltage waveform drops by more than 30% within a continuous half-cycle, it is immediately confirmed as "the transport boat has suffered a total power outage and crash disaster".

[0037] In the microsecond instant of detecting the disaster, the microgrid energy dispatch central controller immediately blocks the trigger pulses of the active front-end rectifier module, completely severing the connection with the paralyzed power grid of the transport boat at both the physical and electrical levels, preventing the DC power of the jet bridge itself from flowing back to the short-circuit point of the mother ship. At this time, because the common DC busbar is fully supported by a fully charged supercapacitor bank, the bidirectional inverter drive and hydraulic pump station motor will not experience shutdown or interruption.

[0038] The power outage self-rescue procedure also includes a hard-wired bypass mechanism: When the microgrid energy dispatch central controller detects a power outage or internal bus communication failure, it sends high-level analog / digital pulses directly to the unloading valve and lifting valve of the hydraulic valve island through the underlying FPGA or safety relay, forcibly opening the hydraulic oil circuit for physical escape.

[0039] The microgrid energy dispatch central controller enters the highest level of "desperate situation self-rescue mode," automatically blocking all conventional manual operation handle signals. It directly calls upon the "life-saving power reserve" at the bottom layer of the supercapacitor bank, causing the variable frequency motor to operate at full load to establish extreme hydraulic pressure, and forcibly opens the unloading and retraction valves of the bottom hydraulic valve island directly through a pure hardware bypass signal. Under the premise of losing all external power and signal, the bridge relies on its own internal energy to complete the "rapid automatic lifting and detachment" of the main boom before the transport boat macroscopically slides into the abyss, thus saving personnel and equipment.

[0040] By integrating all the aforementioned electrical transformations and mechanical actions, this invention constructs a globally controlled closed-loop operation system specifically tailored for boarding operations on unpowered positioning transport boats, as detailed below. Figure 4 As shown.

[0041] The points to be protected by this invention: For the first time, equipment has been added to the rear of a marine transport vessel without a power positioning function, introducing four major concepts: "AC-DC-AC microgrid decoupling", "load redundancy dynamic game", "fluid potential energy four-quadrant inversion" and "zero power outage island escape".

[0042] I. AC / DC Hybrid Power Supply System Architecture for Microgrids on Boardwalks of Unpowered Positioning Vessels: Protect an electrical isolation and reconfiguration system located between the main power grid of a transport boat and the high dynamic hydraulic load of the boarding bridge. The system to be protected includes, in sequence: a front-end AC isolation transformer, a power-controllable active front-end rectifier module, a common DC bus composite energy storage array consisting of supercapacitor banks and lithium titanate batteries, and a back-end bidirectional inverter driver.

[0043] Protecting this topology can physically block the large current surges and high-order harmonics generated by the bridge motor during wave compensation start-up and shutdown phases from feeding back to the ship's AC busbar, thus establishing the basic framework of a microgrid of "external trickle power intake - local reservoir energy storage - internal high-frequency high-power drive".

[0044] II. Dynamic peak shaving and valley filling and smoothing distribution method based on ship power grid margin perception: The central controller for energy dispatching in the microgrid protecting the bridge dynamically acquires the current power load rate and remaining available power of the transport boats via a communication bus at high frequency, and adjusts the upper limit threshold of AC power extracted by the active front-end rectifier module in real time accordingly. Control methods.

[0045] Protecting the bridge from the transient, enormous mechanical power demands caused by wave-induced vibrations. ,and At that time, the controller forces the active front-end rectifier module to lock to At the same time, the DC bus voltage drops slightly, triggering the parallel supercapacitor bank to release an instantaneous current equal to ( ) according to Kirchhoff's current law. The power gap is used to achieve a "peak shaving" control model.

[0046] Protect when the waves are calm At the same time, the active front-end rectifier module continues to extract electrical energy at a constant low power, and the surplus power is automatically injected into the supercapacitor bank for smooth charging.

[0047] III. A four-quadrant inversion and recovery method for wave-driven hydraulic kinetic energy and gravitational potential energy: The system identifies the reverse high-pressure backflow generated by the hydraulic cylinder during the descent of the main arm of the corridor bridge with the waves or the thrust of the waves, forcing the hydraulic pump to switch to "hydraulic motor" mode, and then reversely dragging the main frequency converter motor into the power generation quadrant.

[0048] The internal topology of the bidirectional inverter driver is used to actively rectify the chaotic three-phase AC power generated by the passive reverse rotation of the drive motor into smooth DC power, and preferentially inject it into the common DC bus. The energy is then fully absorbed by the supercapacitor bank through an internal closed-loop self-circulation method.

[0049] IV. Zero-delay self-rescue and rapid escape method for isolated islands based on ship-wide power failure detection: Conventional uninterruptible power supplies (UPS) are only used to maintain weak electrical control systems. This invention focuses on protecting the logic of using energy storage to drive heavy hydraulic machinery for physical escape.

[0050] The protection system monitors the AC input voltage at a microsecond sampling rate. When it determines that the voltage drop exceeds the safety threshold (e.g., a drop of 30% lasting for half a cycle), it instantly blocks the trigger pulse of the active front-end rectifier module, thereby achieving a control method that physically disconnects the microgrid of the corridor bridge from the power grid of the paralyzed mother ship.

[0051] The protection system ensures that the bidirectional inverter driver and heavy-duty hydraulic pump station motor do not experience any shutdown, restart, or interruption when the external power grid is disconnected, relying on the voltage stabilization characteristics of the common DC bus, thus achieving a seamless switch to islanded mode.

[0052] After the central controller for energy dispatch of the microgrid enters island mode, it immediately calls the reserved escape power at the bottom layer of the supercapacitor bank, forcibly shields and overwrites all conventional manual operation handle signals, drives the hydraulic pump station at full power to establish extreme high pressure, and triggers the bottom hydraulic valve island to execute the forced intervention mechanism of automatic lifting (Auto-Lift) and retraction of the main boom of the corridor bridge.

[0053] V. Power Depth Management and Guaranteed Allocation Mechanism for Heterogeneous Composite Energy Storage Arrays This study protects a management strategy that uses high-power-density supercapacitor banks in parallel with high-energy-density lithium titanate battery cabinets. The supercapacitors are responsible for peak shaving and valley filling due to their high response frequency and extremely large pulse current; the lithium titanate battery cabinets are responsible for maintaining the system's basic static power consumption and providing minute-level endurance in islanded mode.

[0054] The central controller for energy dispatching in the protection microgrid sets a mandatory power level (e.g., 15% of the total capacity) for the composite energy storage array. During normal grid-connected operations, even if continuous extreme and abnormal waves cause a decrease in energy storage, the system must never allow the use of this red-line power level; it must be absolutely frozen and can only be unlocked and released by hardware when a "total power outage and island escape" scenario is triggered.

[0055] VI. Pure Hardware-Level Bottom-Line Trigger Mechanism Across Communication Protocol Stacks When the central controller for energy dispatching of the microgrid detects a power outage or a serious internal bus communication failure on the entire ship, it does not rely on Ethernet or fieldbus data packet transmission. Instead, it sends high-level analog / digital pulses directly to the unloading valve and lifting valve of the hydraulic valve island through the underlying field-programmable gate array (FPGA) or safety relays to forcibly open the hydraulic oil circuit for escape.

[0056] The preferred embodiments of the present invention have been described in detail above; however, the present invention is not limited thereto. Within the scope of the inventive concept, various simple modifications can be made to the technical solutions of the present invention, including combinations of various technical features in any other suitable manner. These simple modifications and combinations should also be considered as the content disclosed in the present invention and are all within the protection scope of the present invention.

Claims

1. A flexible power supply and self-rescue electrical system for the boarding bridge of a transport boat, characterized in that: It includes a high-frequency electrical isolation transformer, an active front-end rectifier module, a common DC busbar, a bidirectional inverter driver, and a main frequency converter motor of a hydraulic pump station, which are connected in sequence. The common DC busbar is connected in parallel with a composite energy storage array. It also includes a microgrid energy dispatch central controller, the output of which is connected to the input signals of the active front-end rectifier module, the bidirectional inverter driver and the main frequency converter motor of the hydraulic pump station, respectively. The input terminals of the high-frequency electrical isolation transformer and the microgrid energy dispatch central controller are respectively connected to the basic AC power supply network of the transport boat. The output of the microgrid energy dispatch central controller is also connected to the bottom hydraulic valve island.

2. The flexible power supply and self-rescue electrical system for the boarding bridge of a transport boat according to claim 1, characterized in that, The composite energy storage array includes a supercapacitor bank and a lithium titanate battery bank connected in parallel.

3. The flexible power supply and self-rescue electrical system for the boarding bridge of a transport boat according to claim 1, characterized in that, The active front-end rectifier module uses pulse width modulation technology to control the current waveform extracted from the main power distribution board of the transport boat into a sine wave.

4. The flexible power supply and self-rescue electrical system for the boarding bridge of a transport boat according to claim 1, characterized in that, The microgrid energy dispatch central controller has a built-in grid monitoring module, which is used to monitor the AC input voltage of the transport boat.

5. A flexible power supply and self-rescue electrical control method for the boarding bridge of a transport boat, characterized in that, The flexible power supply and self-rescue electrical system for the boarding bridge of a transport boat according to any one of claims 1-4 includes the following steps: The microgrid energy dispatch central controller reads the current remaining available power limit of the transport boat in real time via the communication bus. ; When the transient mechanical power generated by the hydraulic system of the covered bridge At that time, the peak-shaving discharge logic is triggered, and the microgrid energy dispatch central controller instructs the active front-end rectifier module to maintain a constant power output. The output is filled by the instantaneous natural discharge of the composite energy storage array connected in parallel to the common DC bus; When the waves enter a period of calm, that is When the valley filling charging logic is triggered, the active front-end rectifier module continues to operate at a constant power. Power is drawn from the transport boat, and the surplus power automatically flows into the common DC bus to smoothly recharge the composite energy storage array.

6. The method for flexible power supply and self-rescue electrical control of a boarding bridge for a transport boat according to claim 5, characterized in that, It also includes energy recovery steps: During the wave compensation cycle, when the transport boat is lifted by the surging waves or the main arm of the boardwalk is forced to descend under its own weight and wave thrust, the hydraulic cylinder generates a reverse high-pressure backflow, which forces the hydraulic pump to be reverse-driven and converted into a hydraulic motor mode, thereby dragging the hydraulic pump station motor into the power generation quadrant in the reverse direction; the bidirectional inverter driver rectifies the AC power generated by the motor into smooth DC power, injects it in reverse into the common DC bus, and is absorbed and stored by the composite energy storage array.

7. The method for flexible power supply and self-rescue electrical control of a boarding bridge for a transport boat according to claim 5, characterized in that, It also includes self-rescue steps in the event of a power outage: The grid monitoring module of the microgrid energy dispatch central controller monitors the AC input voltage of the transport boat in real time. When it is determined that the transport boat has lost power, it immediately blocks the trigger pulse of the active front-end rectifier module, cuts off the connection with the paralyzed power grid of the transport boat at the physical and electrical level, and switches to the composite energy storage array connected in parallel with the common DC bus to continue power supply.

8. The method for flexible power supply and self-rescue electrical control of a boarding bridge for a transport boat according to claim 7, characterized in that, The power failure self-rescue steps also include a hard-wired bypass mechanism: When the microgrid energy dispatch central controller detects a power outage or internal bus communication failure, it sends high-level analog / digital pulses directly to the unloading valve and lifting valve of the hydraulic valve island through the underlying FPGA or safety relay, forcibly opening the hydraulic oil circuit for physical escape.

9. The method for flexible power supply and self-rescue electrical control of a boarding bridge for a transport boat according to claim 5, characterized in that, The supercapacitor bank of the composite energy storage array is responsible for responding to wave compensation peak shaving and valley filling. The lithium titanate battery pack is responsible for maintaining the system's basic static power consumption and providing minutes of battery life in islanded mode.

10. The flexible power supply and self-rescue electrical control method for the boarding bridge of a transport boat according to claim 5, characterized in that, The power gap is the difference between the transient mechanical power generated by the bridge's hydraulic system and the upper limit of the current remaining available power of the transport boat.

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