Multi-output shore power device

Abstract

The utility model provides a multi-output shore power device, which comprises a user switch cabinet and a shore power supply device, the shore power supply device comprises a wire inlet cabinet, a metering cabinet, a frequency converter cabinet, an isolation transformer, a current limiting cabinet and a wire outlet switch which are electrically connected with one another, and the front of the user switch cabinet is connected with a bus and the rear of the user switch cabinet is connected with the wire inlet cabinet; the output end of the outgoing line switch is connected with the shore power output port; and at least one group of power frequency output bypass devices are connected in parallel with the frequency converter cabinet and are connected with the shore power output port. By additionally arranging a high-voltage vacuum contactor, random selection of 50Hz and 60Hz is realized, and simultaneous power supply is realized; the shore power supply output mode is changed into VBF control, any low-voltage ship can be carried, and two low-voltage ships can be carried at the same time.

Description

Technical Field

[0001] This utility model belongs to the technical field of shore power supply devices, specifically relating to a multi-output shore power device. Background Technology

[0002] Shore power refers to a method of supplying electricity to a ship's electrical system by land-based power sources instead of using the ship's diesel generators while the ship is in port. Using shore power can optimize the aquatic environment, reduce ship noise pollution and carbon emissions, and achieve a green energy effect of "zero fuel consumption, zero emissions, and zero noise".

[0003] The following problems exist in actual use: (1) The shore power supply output generally adopts the constant frequency boost method. The frequency converter first outputs to the rated voltage and rated frequency, and then closes the output switch. This output method has no problem when driving any one low-voltage ship, but when driving two low-voltage ships at the same time, the output current will oscillate due to the simultaneous presence of two transformers, which will cause the shore power supply to trip due to overvoltage; (2) The current frequency in my country is 50HZ. Many foreign ships need to use 60HZ current. Although the frequency can be adjusted by the frequency converter in the shore power supply, a set of shore power supply can only output one power frequency at the same time. In order to meet the need to output two power frequencies at the same time, two sets of shore power supply are generally configured, which results in high construction costs.

[0004] Therefore, it is urgent to design a multi-output shore power device to solve the above problems. Utility Model Content

[0005] To address the above technical problems, this utility model provides a multi-output shore power device that can not only stably output current, but also simultaneously output two different frequencies of current to meet diverse needs.

[0006] The technical solution of this utility model is: a multi-output shore power device, including a user switch cabinet and a shore power supply device. The shore power supply device includes an incoming line cabinet, a metering cabinet, a frequency converter cabinet, an isolation transformer, a current limiting cabinet, and an outgoing line switch that are electrically connected to each other. The user switch cabinet is connected to a busbar in front and the incoming line cabinet in the back. At least one outgoing line switch is provided, and the output end of the outgoing line switch is connected to the shore power output port.

[0007] At least one set of power frequency output bypass devices is connected in parallel with the inverter cabinet, and the power frequency output bypass devices are connected to the shore power output port.

[0008] Preferably, the power frequency output bypass device is a high-voltage vacuum contactor, the input terminals of which are all connected to the input terminals of the frequency converter cabinet, and the output terminals of which are connected to the output terminals of the outgoing line switch.

[0009] Preferably, a transformer is connected in series between the output terminal of the outgoing switch and the shore power output port.

[0010] Preferably, the high-voltage vacuum contactor is electrically connected to the frequency converter PLC, and the frequency converter PLC is electrically connected to the touch screen.

[0011] Preferably, the inverter of the shore power supply device outputs a current of 60Hz.

[0012] Preferably, the high-voltage vacuum contactor and the corresponding outgoing switch are electrically interlocked.

[0013] Preferably, the shore power output method is VBF control.

[0014] The beneficial effects of this utility model are: (1) By adding a high-voltage vacuum contactor to the output end of the metering cabinet, 50Hz and 60Hz can be selected at will and power can be supplied simultaneously;

[0015] (2) The shore power output mode is changed to VBF control, which can meet the requirements of powering any one low-voltage ship, and can also power two low-voltage ships at the same time;

[0016] (3) It can be directly modified based on the existing shore power supply, which greatly reduces the construction cost. Attached Figure Description

[0017] Figure 1 This is the electrical circuit diagram of this utility model. Detailed Implementation

[0018] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0019] In the description of this utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "vertical", "horizontal", "inner", "outer", "front", "back", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0020] Figure 1The diagram shows the electrical wiring structure of a multi-output shore power system. In this embodiment, it includes a user switch cabinet and a shore power supply unit. The shore power supply unit includes a 6kV incoming line cabinet, a 6kV metering cabinet, a frequency converter cabinet, an isolation transformer, a current limiting cabinet, and two 6kV outgoing line switches. The input terminal of the user switch cabinet is electrically connected to the 6kV busbar. The output terminal of the user switch cabinet is electrically connected to the input terminal of the incoming line cabinet. The input terminal of the incoming line cabinet is electrically connected to the input terminal of the metering cabinet. The output terminal of the metering cabinet is electrically connected to the input terminal of the frequency converter cabinet. The output terminal of the frequency converter cabinet is electrically connected to the input terminal of the isolation transformer. The output terminal of the isolation transformer is electrically connected to the input terminal of the current limiting cabinet. The output terminal of the current limiting cabinet is electrically connected to the outgoing line switches.

[0021] In this embodiment, there are two 6kV outgoing line switches connected in parallel. The output terminals of the 6kV outgoing line switches are connected to the shore power output port, which is the shore power box. The shore power box is used to connect to the ship and output the frequency-converted current to supply power to the ship.

[0022] In this embodiment, two sets of power frequency output bypass devices are connected in parallel with the inverter cabinet to output 6kV 50Hz current. The power frequency output bypass devices are connected to the shore power output port.

[0023] Specifically, the two sets of power frequency output bypass devices are two high-voltage vacuum contactors, namely bypass switches KM10 and KM11. The input terminals of the high-voltage vacuum contactors are connected to the input and output terminals of the frequency converter cabinet. The high-voltage vacuum contactors are connected in parallel, and the output terminals of the high-voltage vacuum contactors are connected to the output terminals of the outgoing line switches respectively.

[0024] In this embodiment, a transformer is connected in series between the output terminal of the outgoing switch and the shore power output port. This is used to adapt the voltage.

[0025] In this embodiment, the high-voltage vacuum contactor is electrically connected to the frequency converter PLC, and the frequency converter PLC is electrically connected to the touch screen. This enables electronic control of the high-voltage vacuum contactor.

[0026] In this embodiment, the inverter of the shore power supply unit outputs a current of 60Hz.

[0027] In this embodiment, the high-voltage vacuum contactor and the corresponding outgoing switch are electrically interlocked. Electrical interlocking is a conventional technical measure used to ensure electrical safety; its specific structure will not be described in detail.

[0028] The shore power output uses VBF control. VBF control means that the output voltage and output frequency increase proportionally, which can power any one low-voltage vessel and can also power two low-voltage vessels simultaneously.

[0029] Working principle: When different frequency currents are required, the frequency converter operates and can provide 60Hz power by closing one outgoing switch and 50Hz power by closing another high-voltage vacuum contactor; when the frequency converter fails, KM10 and KM11 close and can provide 50Hz power.

[0030] This invention allows for arbitrary selection of 50Hz and 60Hz by adding a high-voltage vacuum contactor, while simultaneously supplying power to ships with different electrical parameters; it can be directly modified based on existing shore power supplies, greatly reducing construction costs.

[0031] This utility model is not limited to the above embodiments. Based on the technical solutions disclosed in this utility model, those skilled in the art can make some substitutions and modifications to some of the technical features without creative labor, and these substitutions and modifications are all within the protection scope of this utility model.

Claims

1. A multi-output shore power unit, comprising a user switch cabinet and a shore power supply unit, wherein the shore power supply unit comprises an incoming line cabinet, a metering cabinet, a frequency converter cabinet, an isolation transformer, a current limiting cabinet, and an outgoing line switch that are electrically connected to each other, and the user switch cabinet is connected to a busbar at the front and the incoming line cabinet at the rear; characterized in that, The outgoing switch is provided at least one, and the output terminal of the outgoing switch is connected to the shore power output port; At least one set of power frequency output bypass devices is connected in parallel with the inverter cabinet, and the power frequency output bypass devices are connected to the shore power output port.

2. The multi-output shore power device according to claim 1, characterized in that, The power frequency output bypass device is a high-voltage vacuum contactor. The input terminal of the high-voltage vacuum contactor is connected to the input terminal of the frequency converter cabinet, and the output terminal of the high-voltage vacuum contactor is connected to the output terminal of the outgoing line switch.

3. The multi-output shore power device according to claim 2, characterized in that, A transformer is connected in series between the output terminal of the outgoing switch and the shore power output port.

4. The multi-output shore power device according to claim 3, characterized in that, The high-voltage vacuum contactor is electrically connected to the frequency converter PLC, and the frequency converter PLC is electrically connected to the touch screen.

5. The multi-output shore power device according to claim 1, characterized in that, The inverter of the shore power supply unit outputs a 60Hz current.

6. The multi-output shore power device according to claim 2, characterized in that, The high-voltage vacuum contactor and the corresponding outgoing switch are electrically interlocked.

7. The multi-output shore power device according to claim 1, characterized in that, The shore power output is controlled by VBF.

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