Device for converting alternating current shore power into direct current power supply for special ship

Abstract

The utility model discloses an alternating current shore power to direct current power supply device for a special ship, which belongs to the technical field of power supply equipment and comprises a shell. The inlet wire alternating current circuit breaker and the outlet wire direct current circuit breaker are used for protecting a total port of the device; a plurality of AC-DC modules; the branch alternating current circuit breaker and the branch direct current circuit breaker are used for protecting the AC-DC module; the controller is used for controlling the working state of the device; wherein the input quick connector, the inlet wire alternating current circuit breaker, the branch alternating current circuit breaker, the AC-DC module, the branch direct current circuit breaker, the outlet wire direct current circuit breaker and the output quick connector are electrically connected in sequence; according to the utility model, the problem of power supply system difference when special ships use shore power at ports of different countries is solved, the compatibility of alternating current power supply with various voltages and frequencies is realized, and stable and reliable direct current power supply output is provided.

Description

TECHNICAL FIELD

[0001] The utility model belongs to power supply equipment technical field especially relates to an alternating current shore power conversion direct current power supply device for special ship. BACKGROUND

[0002] Special ships need to use shore power system for power supply when they are at the dock. There are differences in power supply systems in different countries and regions, mainly in voltage and frequency. Most places and countries use 50Hz frequency for power supply and electrical equipment, and a few regions and countries use 60Hz frequency. Low-voltage alternating current voltage includes many specifications such as 450V, 440V, 400V and 380V.

[0003] When special ships are at ports all over the world, they need to be able to adapt to different shore power systems. Power supply devices that can be compatible with various voltages and frequencies are crucial for the normal operation and equipment protection of special ships. This not only relates to the normal operation of ship equipment, but also affects the work efficiency and safety of personnel after landing.

[0004] When special ships face various shore power systems, they often cannot directly use shore power. This problem leads to a series of chain reactions such as increased equipment wear and tear, increased burden on personnel on board, increased safety hazards and reduced work efficiency. Therefore, there is an urgent need for a special device that can convert various voltages and frequencies of alternating current power supply in various countries into direct current power required by special ships. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing an alternating current shore power conversion direct current power supply device for special ships to solve the technical problem that special ships often cannot directly use shore power when they face various shore power systems as mentioned in the background.

[0006] In order to achieve the above-mentioned purpose, the utility model provides the following technical scheme:

[0007] An alternating current shore power conversion direct current power supply device for special ships, comprising a shell, wherein an input quick connector and an output quick connector for connecting the power supply device with external wiring are arranged in the shell;

[0008] An input quick connector and an output quick connector for connecting the power supply device with external wiring are arranged in the shell;

[0009] An input quick connector and an output quick connector for connecting the power supply device with external wiring are arranged in the shell;

[0010] An input quick connector and an output quick connector for connecting the power supply device with external wiring are arranged in the shell;

[0011] An input quick connector and an output quick connector for connecting the power supply device with external wiring are arranged in the shell; An input quick connector and an output quick connector for connecting the power supply device with external wiring are arranged in the shell;

[0012] A controller for controlling the working state of the device; wherein:

[0013] The input quick connector, the incoming AC circuit breaker, the branch AC circuit breaker, the AC-DC module, the branch DC circuit breaker, the outgoing DC circuit breaker and the output quick connector are sequentially electrically connected; the controller is connected with the input quick connector, the incoming AC circuit breaker, the branch AC circuit breaker, the AC-DC module, the branch DC circuit breaker, the outgoing DC circuit breaker and the output quick connector respectively.

[0014] Preferably, the input quick connector and the output quick connector adopt quick joints; it is convenient to quickly connect and disconnect the power supply, and the operation efficiency and safety are improved.

[0015] Preferably, the incoming AC circuit breaker is a GM5T-200 model in a small shell frame form, and the outgoing DC circuit breaker is a GM5DC-400 model in a small shell frame form; the input and output ends of the entire system are protected to prevent overload and short circuit.

[0016] Preferably, the AC-DC module adopts a multi-AC-DC module parallel form for improving the system reliability and stability and realizing load balancing; each AC-DC module is configured with a branch AC circuit breaker on the AC side and a branch DC circuit breaker on the DC side; each AC-DC module is protected to realize modular management and fault isolation.

[0017] Preferably, the front stage of the AC-DC module adopts a Vienna rectifier circuit controlled by PWM; it is used for improving the power supply quality and reducing harmonic interference.

[0018] Preferably, the rear stage of the AC-DC module adopts a phase-shift full-bridge soft switching conversion circuit with an isolation transformer; it is used for improving the conversion efficiency and reducing the switching loss.

[0019] Preferably, the AC-DC module is provided with a fan, and the AC-DC module is externally provided with an insulation layer; it is used for improving the protection ability and heat dissipation effect of the module.

[0020] Preferably, the controller includes a host module, an expansion module and a human-computer interaction screen, the host module is electrically connected with the expansion module, and the host module is connected with the human-computer interaction screen; it is used for realizing the intelligent control and human-computer interaction of the system. The controller is connected with the incoming AC circuit breaker, the branch AC circuit breaker, the AC-DC module, the branch DC circuit breaker and the outgoing DC circuit breaker respectively, and is used for controlling the on-off of each circuit breaker to realize the start-stop of the control system.

[0021] Preferably, the controller further comprises a detection unit and an auxiliary power supply for powering the controller, the detection unit comprising a voltage sensor for monitoring the output voltage and a current sensor for monitoring the output current; for monitoring the system output voltage and current in real time, ensuring safe and stable operation of the system.

[0022] Preferably, the shell adopts a stainless steel 304 spraying process, and the protection level of the closed state of the box is IP54; for adapting to the high-temperature, high-humidity and high-salt environment on the seaside, and protecting the internal equipment.

[0023] Compared with the prior art, the utility model has the beneficial effects that:

[0024] The application provides a special DC power supply device for special ships, solves the difference problem of power supply systems when the special ships use shore power in different countries and ports, realizes the compatibility of AC power supply of various voltages and frequencies, and provides stable and reliable DC power output; by adopting the AC-DC module of the multiple AC-DC modules in parallel, the Vienna rectifier circuit controlled by PWM and the phase-shifted full-bridge soft switching conversion circuit, the compatibility of various AC power supplies in the range of 100-500V and 45-65Hz is realized, and the stable DC440V DC output is converted; the AC-DC module adopts the multiple module parallel design, realizes the current sharing and redundancy functions, and significantly improves the reliability and stability of the system; the conversion circuit with an isolation transformer realizes the effective isolation of the power grid and the ship power supply. At the same time, by setting circuit breakers (such as incoming AC circuit breakers, outgoing DC circuit breakers, branch circuit breakers and the like) at key nodes, comprehensive electrical protection is provided; by adopting the fast connector, the mechanism pull-in-pull-out and the lock hook device, the convenience and reliability of the power supply connection are greatly improved; the shell adopts a stainless steel 304 spraying process and reaches the IP54 protection level, effectively coping with the high-temperature, high-humidity and high-salt environment on the seaside. The AC-DC module is externally provided with an insulation layer, further improving the protection capability; the AC-DC module is provided with a fan, ensuring the heat dissipation effect during high-power operation; by configuring the controller including the host module, the expansion module and the man-machine interaction screen, in combination with the voltage and current sensors, intelligent control and real-time monitoring of the system are realized. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 It is an internal front view of the power supply device of the preferred embodiment of the utility model;

[0026] Figure 2 It is a main circuit principle diagram of the power supply device of the preferred embodiment of the utility model;

[0027] Figure 3 It is an appearance structure diagram of the fast connector in the preferred embodiment of the utility model;

[0028] Figure 4It is another angle appearance structure diagram of the quick connector in the preferred embodiment of the utility model;

[0029] Figure 5 It is appearance structure diagram of AC-DC module in the preferred embodiment of the utility model;

[0030] Figure 6 It is front stage circuit principle diagram of AC-DC module in the preferred embodiment of the utility model;

[0031] Figure 7 It is back stage circuit principle diagram of AC-DC module in the preferred embodiment of the utility model;

[0032] Figure 8 It is circuit connection diagram of controller in the preferred embodiment of the utility model. DETAILED DESCRIPTION

[0033] The technical scheme in the preferred embodiments of the utility model will be described clearly and completely below with reference to the drawings in the preferred embodiments of the utility model, and all other embodiments obtained by the person skilled in the art without making creative efforts based on the embodiments in the utility model belong to the protection scope of the utility model.

[0034] As Figures 1-8 Shown in:

[0035] An alternating current shore power to direct current power supply device for special ship, comprising a shell, AC-DC modules for converting alternating current shore power to direct current power required by the ship are arranged in the shell,

[0036] Input quick connector and output quick connector for connecting the power supply device and external wiring;

[0037] Incoming line AC circuit breaker and outgoing line DC circuit breaker as protection of total port of device input and output;

[0038] AC-DC modules for converting alternating current shore power to direct current power required by the ship are arranged in the shell,

[0039] Branch AC circuit breaker and branch DC circuit breaker for protecting AC-DC modules in branch circuit;

[0040] Controller for controlling the working state of the device, wherein:

[0041] The input quick connector, incoming line AC circuit breaker, branch AC circuit breaker, AC-DC module, branch DC circuit breaker, outgoing line DC circuit breaker and output quick connector are electrically connected in sequence; the controller is connected with the incoming line AC circuit breaker, branch AC circuit breaker, AC-DC module, branch DC circuit breaker and outgoing line DC circuit breaker respectively.

[0042] The shell adopts a stainless steel 304 spraying process, suitable for the salt mist environment of the wharf; the box has moisture-proof and heat dissipation functions, and the devices in the box are selected from three-proof treated or wet heat type devices; the protection level of the closed state of the box body is designed as IP54 to isolate the harsh environment, and the cabinet door is opened by air support in the use state, which blocks some small wind and rain for air cooling and heat dissipation in the working state; the shell base is provided with a slot hole to facilitate the movement of the device by a forklift.

[0043] Please refer to Figure 3 and Figure 4 , the input quick connector and the output quick connector adopt a quick connector and are provided with a locking hook device, and are connected by pulling in and pushing out quickly. The input wiring and the output wiring can be conveniently and reliably connected to the power supply device, which improves the reliability of the connection and reduces the difficulty of the connection work.

[0044] The incoming line AC circuit breaker is a small shell frame type GM5T-200 model, and the outgoing line DC circuit breaker is a small shell frame type GM5DC-400 model; the small shell frame type circuit breaker can reduce the space occupation.

[0045] The AC-DC module adopts a multi-AC-DC module parallel form, each AC-DC module is configured with a branch AC circuit breaker on the AC side and a branch DC circuit breaker on the DC side. The AC-DC module is externally provided with an insulation layer, specifically a glue filling process, which can make the module smoke-proof, damp-proof, mildew-proof, etc., and the protection ability is significantly improved. The AC-DC module is provided with a fan and adopts forced air cooling for heat dissipation.

[0046] The front stage of the AC-DC module adopts a PWM controlled Vienna rectifier circuit.

[0047] Specifically, the Vienna rectifier is a two-quadrant midpoint embedding type three-level PWM rectifier circuit topology. In applications where energy does not need to flow bidirectionally, there are many advantages: on the one hand, compared with the traditional two-level structure, due to the increase in the number of levels, the current harmonic distortion rate and the voltage stress of the power switch device are reduced; on the other hand, compared with the three-level rectifier, the required power switch device is reduced from 12 to 6, which reduces the switching loss, cost and control complexity; in addition, when the power switch device is turned on, the diode connected to the DC bus can block the DC current, and there is no output voltage bridge arm through problem, and no driving dead time needs to be set, thereby further improving the reliability of the rectifier.

[0048] Please refer to Figure 6, three-phase alternating current power supply U_a, U_b and U_c are filtered and current detected through inductance L and resistance R, and then enter the rectifier bridge circuit; the rectifier bridge circuit is composed of diode array, which converts alternating current into direct current; the rectified current passes through PWM controlled switching elements Sa, Sb and Sc; these switching elements are controlled by PWM signals to achieve efficient rectification and power factor correction; finally, the rectified direct current is smoothed by filter capacitors C1 and C2, and the output is stable direct current voltage V_{in}; the neutral line N is used to balance the current of the three-phase system.

[0049] The rear stage of the AC-DC module adopts a phase-shifted full-bridge soft switching conversion circuit with an isolation transformer.

[0050] Specifically, the phase-shifted full-bridge soft switching conversion circuit with an isolation transformer inverts the DC bus voltage into high-frequency alternating current with controllable amplitude, and then isolates it through a high-frequency transformer. The output side of the high-frequency transformer generates the final required DC voltage through full-bridge rectification. Zero voltage switching is achieved by using capacitors and inductors in the circuit, which overcomes the disadvantage of proportional increase of switching loss with switching frequency in other types of topology, further improves the power density and switching frequency of the conversion circuit, and achieves the purpose of improving conversion efficiency and reducing volume and weight.

[0051] Please refer to Figure 7 , the input DC voltage V_{in} is first connected to the full-bridge circuit composed of four switching elements S1, S2, S3 and S4, each switching element is connected in parallel with a diode D and a capacitor C, switching element S1 is connected in parallel with D1 and C1 respectively, switching element S2 is connected in parallel with D2 and C2 respectively, switching element S3 is connected in parallel with D3 and C3 respectively, and switching element S4 is connected in parallel with D4 and C4 respectively; the output of the full-bridge circuit is connected to the secondary coil of the transformer through the primary coil L_{k} of the isolation transformer. The transformer secondary output is rectified by rectifier diodes D5, D6, D7 and D8, and the rectified DC is smoothed by filter inductor L_f and filter capacitor C_f, and finally the stable DC voltage V_o is output.

[0052] Please refer to Figure 8The controller comprises a host module, an extension module and a man-machine interaction screen, the host module is connected with the extension module, and the host module is connected with the man-machine interaction screen.The model of the host module is AS228T-A, and the model of the extension module is AS16AN01T-A.The host module and the extension module and the host module and the man-machine interaction screen all adopt Ethernet for communication.On one hand, the host obtains instructions from the man-machine interaction screen, and on the other hand, the host issues commands to each AC-DC module.The controller is connected with an incoming line AC circuit breaker, a branch AC circuit breaker, an AC-DC module, a branch DC circuit breaker and an outgoing line DC circuit breaker, and is used for controlling each circuit breaker to realize starting and stopping of the control system.

[0053] The controller further comprises a detection unit and an auxiliary power supply for supplying power to the controller, the detection unit comprises a voltage sensor for monitoring output voltage and a current sensor for monitoring output current.The model of the voltage sensor is LEM-LV25-500, and the model of the current sensor is LEM-HAT500.

[0054] Specifically, please refer to Figure 2 The input quick connector in the device is connected with the incoming line AC circuit breaker QF1, the input end of the 20 AC-DC modules M1-M20 is connected with the QF1, the input end and the output end of each AC-DC module are connected with the corresponding branch AC circuit breaker Q101-Q120 and the branch DC circuit breaker Q201-Q220, the output ends of the 20 AC-DC modules are connected with the outgoing line DC circuit breaker QF2 after being gathered, and the QF2 is connected with the output quick connector; the controller K is connected with each AC-DC module M and each circuit breaker to realize the protection function, the whole device realizes conversion from AC shore power to DC marine power, and provides multi-level protection and control functions.

[0055] The utility model provides a kind of AC shore power conversion DC power supply device for special ship, including shell, input quick connector, incoming line AC circuit breaker, branch AC circuit breaker, AC-DC module, branch DC circuit breaker, outgoing line DC circuit breaker, output quick connector are sequentially electrically connected;The controller is connected with incoming line AC circuit breaker, branch AC circuit breaker, AC-DC module, branch DC circuit breaker and outgoing line DC circuit breaker respectively, for controlling each circuit breaker to realize control system start-stop.

[0056] Working principle:

[0057] The AC shore power current enters the device from the input quick connector first, and then passes through the incoming AC circuit breaker QF1, which is used for safety protection of the circuit to prevent the circuit from being damaged or causing a fire due to excessive current, and when the current exceeds the preset value, the circuit breaker will automatically disconnect to cut off the power supply and protect the circuit from damage; then the current enters the AC-DC module M, and the device has twenty AC-DC modules M1-M20, each of which is configured with branch AC circuit breakers Q101-Q120 on the AC side and branch DC circuit breakers Q201-Q220 on the DC side; the controller K monitors the voltage and current conditions of the AC-DC modules M1-M20 in real time through voltage and current sensors, and distributes the load of each AC-DC module M; the AC current is converted to DC current in the AC-DC module M. The front stage of the AC-DC module M adopts a Vienna rectifier circuit controlled by PWM to convert AC shore power of different voltage frequencies into controllable DC bus voltage. The rear stage adopts a phase-shifted full-bridge soft switching conversion circuit with an isolation transformer to inversely convert the DC bus voltage into controllable high-frequency AC voltage, and then the high-frequency transformer is isolated, and the output side of the high-frequency transformer is rectified by a full-bridge rectifier to generate the final required DC voltage. The converted DC current passes through the outgoing DC circuit breaker QF2, which is also used for protecting the circuit safety. Finally, the DC current is output through the output quick connector to provide rated voltage DC440V and current 250A of the special DC power supply for special ships.

[0058] The entire system is monitored and managed by the controller K, including the AS228T-A host module and the AS16AN01T-A expansion module. The controller has AC side short circuit, overload, open phase protection, and DC side short circuit, overvoltage, overcurrent protection functions. In addition, the controller is also responsible for current sharing design to ensure that the current is evenly distributed among the AC-DC modules, improving the reliability and stability of the system.

[0059] The above only describes the preferred embodiments of the present application and is not intended to limit the present application, and any modifications, equivalent replacements and improvements made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. An alternating current to direct current power supply device for special ships, comprising a housing, characterized in that, An input quick connector and an output quick connector are arranged in the shell for connecting the power supply device with external wiring. An incoming AC circuit breaker and an outgoing DC circuit breaker are arranged in the shell for protecting the total port of the device input and output. A plurality of AC-DC modules are arranged in the shell for converting AC shore power into DC power required by the ship. Branch AC circuit breakers and branch DC circuit breakers are arranged in the shell for protecting the AC-DC modules in branch circuits. A controller is arranged in the shell for controlling the working state of the device. The input quick connector, the incoming AC circuit breaker, the branch AC circuit breakers, the AC-DC modules, the branch DC circuit breakers, the outgoing DC circuit breaker and the output quick connector are electrically connected in sequence, and the controller is connected with the incoming AC circuit breaker, the branch AC circuit breakers, the AC-DC modules, the branch DC circuit breakers and the outgoing DC circuit breaker respectively. The input quick connector and the output quick connector adopt quick joints.

2. The AC-to-DC power supply apparatus for special ships according to claim 1, characterized by The incoming AC circuit breaker is a GM5T-200 model in a small shell frame, and the outgoing DC circuit breaker is a GM5DC-400 model in a small shell frame.

3. The AC-to-DC power supply apparatus for special ships according to claim 1, characterized by The AC-DC modules adopt a parallel connection form, each AC-DC module is provided with a branch AC circuit breaker on the AC side and a branch DC circuit breaker on the DC side.

4. The AC-to-DC power supply apparatus for special ships according to claim 1, characterized by The front stage of the AC-DC module adopts a Vienna rectifier circuit controlled by PWM.

5. The AC to DC power supply apparatus for special ships according to claim 4, characterized by The rear stage of the AC-DC module adopts a phase-shift full-bridge soft switching conversion circuit with an isolation transformer.

6. The AC to DC power supply apparatus for special ships according to claim 5, characterized by The AC-DC module is provided with a fan, and the AC-DC module is externally provided with an insulation layer.

7. The AC to DC power supply apparatus for special vessels according to any one of claims 4 to 6, characterized in that, The controller comprises a host module, an expansion module and a human-computer interaction screen, the host module is electrically connected with the expansion module, and the host module is connected with the human-computer interaction screen.

8. The AC shore power to DC power supply device for special ships according to claim 1, characterized in that: The controller further comprises a detection unit and an auxiliary power supply for powering the controller, the detection unit comprises a voltage sensor for monitoring output voltage and a current sensor for monitoring output current.

9. The AC-to-DC power supply apparatus for a special vessel according to claim 1 or 8, characterized by The shell adopts a stainless steel 304 spraying process, and the protection level of the closed state of the box body is IP54.

10. The AC to DC power supply apparatus for special ships according to claim 1, characterized by ​

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