Shore power frequency conversion device of ship with variable frequency shaft and generator

Abstract

The invention provides a shore power frequency conversion device of a ship with a frequency conversion shaft and a generator, which comprises an electrical bypass cabinet, and a circuit breaker switch control circuit, a first contactor control loop, a second contactor control loop, a first contactor switch circuit and a second contactor switch circuit are arranged in the electrical bypass cabinet. One end of the circuit breaker switch control circuit is respectively connected with the first contactor control loop, the second contactor control loop, the first contactor switch circuit and the second contactor switch circuit; the ship shore power supply frequency conversion device has the following beneficial effects that the frequency of a shore power supply can be converted into the frequency consistent with the frequency of a ship power grid through the shaft generator frequency converter of the ship, so that the ship can adapt to the shore power supply frequencies of different ports, and the shaft generator frequency converter is arranged on the ship due to the fact that the shaft generator is arranged on the ship; therefore, the device shares the frequency converter with the axle generator, so that the requirements of energy conservation and emission reduction are met, and meanwhile, the cost is saved.

Description

Technical Field

[0001] The present invention relates to the technical field of shore power frequency conversion circuits, and in particular to a shore power frequency conversion device for a ship with a variable frequency shaft belt generator. Background Art

[0002] With the continuous improvement of ships' requirements for energy conservation and emission reduction, more and more ships are equipped with shaft generators and shore power devices that meet regulatory requirements. Shaft generators are generally equipped with frequency converters to meet the requirements of long-term parallel use of shaft generators and diesel generators. Shore power devices generally include a shore power access cabinet, with shore power connection boxes on both sides. Shore power devices are generally not equipped with frequency converters and cannot convert shore power frequency. For international ships, the ports of berthing are often not fixed, so the shore power frequency may be 50Hz or 60Hz. When the ship's power grid frequency is inconsistent with the shore power supply frequency, many docks are not equipped with frequency conversion devices. For some docks equipped with frequency conversion devices, not every berth's shore power device is equipped with a conversion device. Therefore, if the shore power supply supplies power to the ship's power grid for a long time, it will cause damage to the ship's equipment. Therefore, even if the ship is equipped with a shore power access device, the shore power cannot be used normally.

[0003] When the frequency of the terminal power supply is inconsistent with the frequency of the ship's power grid, and the terminal is not equipped with a power frequency conversion device or the conversion device is insufficient, the ship needs to install a shore power inverter to use the shore power supply normally. However, the addition of an inverter on the ship also brings other additional requirements, such as ventilation and heat dissipation, temperature regulation, etc., which will increase the construction cost of the ship and have additional space requirements for equipment layout. However, if the shore power supply is not used, the ship needs to start the generator, which will not be able to achieve the requirements of energy conservation, emission reduction and environmental pollution reduction. Summary of the invention

[0004] In view of the shortcomings of the prior art described above, an object of the present invention is to provide a shore power frequency conversion device for a ship with a variable frequency shaft belt generator, which is used to solve the problem in the prior art that the shore power supply frequency needs to be converted when the ship power grid frequency is inconsistent with the shore power supply frequency.

[0005] In order to achieve the above-mentioned purpose and other related purposes, the present invention provides the following technical solutions:

[0006] A shore power frequency conversion device for a ship with a variable frequency shaft-belt generator comprises an electrical bypass cabinet, wherein a circuit breaker switch control circuit, a first contactor control circuit, a second contactor control circuit, a first contactor switch circuit and a second contactor switch circuit are arranged in the electrical bypass cabinet; one end of the circuit breaker switch control circuit is connected to a main switchboard, and the other end of the circuit breaker switch control circuit is respectively connected to the first contactor control circuit, the second contactor control circuit, the first contactor switch circuit and the second contactor switch circuit, the first contactor switch circuit is connected to the shore power supply through a shaft-belt generator frequency converter, the second contactor switch circuit is connected to the shore power supply, and the first contactor switch circuit and the second contactor switch circuit are respectively in a conducting operating state in response to control signals sent by the first contactor control circuit and the second contactor control circuit to keep the shore power supply frequency consistent with the ship power grid frequency.

[0007] In one embodiment of the present invention, the circuit breaker switch control circuit includes a circuit breaker, a first fuse and a second fuse, one end of the circuit breaker is connected to the main distribution board, the other end of the circuit breaker is connected to the first contactor switch circuit and the second contactor switch circuit respectively through the first fuse, and the other end of the circuit breaker is also connected to the first contactor control circuit and the second contactor control circuit respectively through the second fuse.

[0008] In one embodiment of the present invention, the first contactor control circuit includes a first stop switch, a first contactor normally open auxiliary contact, a second contactor normally closed contact, a first contactor coil and a first start switch, one end of the first stop switch is connected to the circuit breaker switch control circuit, the other end of the first stop switch, the first contactor normally open auxiliary contact, the second contactor normally closed contact and the first contactor coil are connected in series in sequence, the first contactor coil is also connected to the circuit breaker switch control circuit, and the first start switch is connected in parallel with the first contactor normally open auxiliary contact.

[0009] In one embodiment of the present invention, the second contactor control circuit includes a second stop switch, a second contactor normally open auxiliary contact, a first contactor normally closed contact, a second contactor coil and a second starting switch, one end of the second stop switch is connected to the circuit breaker switch control circuit, the other end of the second stop switch, the second contactor normally open auxiliary contact, the first contactor normally closed contact and the second contactor coil are connected in series in sequence, the second contactor coil is also connected to the circuit breaker switch control circuit, and the second starting switch is connected in parallel to the second contactor normally open auxiliary contact.

[0010] In one embodiment of the present invention, the first contactor switch circuit includes a first contactor normally open main contact, one end of the first contactor normally open main contact is connected to the circuit breaker switch control circuit, and the other end of the first contactor normally open main contact is connected to the shore power supply through a shaft generator inverter, and the shaft generator inverter is also connected to the shaft generator.

[0011] In one embodiment of the present invention, the second contactor switch circuit includes a second contactor normally open main contact, one end of the second contactor normally open main contact is connected to the circuit breaker switch control circuit, and the other end of the second contactor normally open main contact is connected to the shore power supply.

[0012] As described above, a shore power frequency conversion device for a ship with a variable frequency shaft generator of the present invention has the following beneficial effects: the present invention can make the normally open main contact of the first contactor in the first contactor switch circuit closed and in a conductive operating state by energizing the first contactor coil in the first contactor control circuit, so that the frequency of the shore power supply is converted into a frequency consistent with the ship's power grid through the ship's own shaft generator frequency converter, so that the ship can adapt to the shore power supply frequency of different ports, and the shaft generator frequency converter is because the shaft generator is equipped on the ship, so the present invention shares the frequency converter with the shaft generator, which not only meets the requirements of energy conservation and emission reduction, but also saves costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 Shown is an overall structural block diagram of a shore power frequency conversion device for a ship with a variable frequency shaft generator disclosed in an embodiment of the present invention;

[0014] Figure 2 Shown is an overall circuit schematic diagram of a shore power frequency conversion device for a ship with a variable frequency shaft belt generator disclosed in an embodiment of the present invention. DETAILED DESCRIPTION

[0015] The following describes the embodiments of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0016] See also Figure 1 The present invention provides a shore power frequency conversion device for a ship with a variable frequency shaft-belt generator, comprising an electrical bypass cabinet, in which a circuit breaker switch control circuit, a first contactor control circuit, a second contactor control circuit, a first contactor switch circuit and a second contactor switch circuit are arranged.

[0017] See also Figure 2The circuit breaker switch control circuit includes a circuit breaker, a first fuse and a second fuse. The circuit breaker QS, the first fuse FU1 and the second fuse FU2 are selected as examples for explanation below; one end of the circuit breaker QS is connected to the main distribution board, and the other end of the circuit breaker QS is connected to the first contactor switch circuit and the second contactor switch circuit respectively through the first fuse FU1. The other end of the circuit breaker QS is also connected to the first contactor control circuit and the second contactor control circuit respectively through the second fuse FU2.

[0018] See also Figure 2 , the first contactor control circuit includes a first stop switch, a first contactor normally open auxiliary contact, a second contactor normally closed contact, a first contactor coil and a first start switch, and the second contactor control circuit includes a second stop switch, a second contactor normally open auxiliary contact, a first contactor normally closed contact, a second contactor coil and a second start switch. The following selects the first stop switch SB3, the first contactor KM1 normally open auxiliary contact, the second contactor KM2 normally closed contact, the first contactor KM1 coil, the first start switch SB1, the second stop switch SB4, the second contactor KM2 normally open auxiliary contact, the first contactor KM1 normally closed contact, the second contactor KM2 coil and the second start switch SB2 as examples for explanation;

[0019] One end of the first stop switch SB3 is connected to the circuit breaker switch control circuit, the other end of the first stop switch SB3, the normally open auxiliary contact of the first contactor KM1, the normally closed contact of the second contactor KM2 and the coil of the first contactor KM1 are connected in series in sequence, the coil of the first contactor KM1 is also connected to the circuit breaker switch control circuit, and the first start switch SB1 is connected in parallel with the normally open auxiliary contact of the first contactor KM1; one end of the second stop switch SB4 is connected to the circuit breaker switch control circuit, the other end of the second stop switch SB4, the normally open auxiliary contact of the second contactor KM2, the normally closed contact of the first contactor KM1 and the coil of the second contactor KM2 are connected in series in sequence, the coil of the second contactor KM2 is also connected to the circuit breaker switch control circuit, and the second start switch SB2 is connected in parallel with the normally open auxiliary contact of the second contactor KM2; wherein a control panel is provided in the electrical bypass cabinet, and the first start switch SB1, the second start switch SB2, the first stop switch SB3 and the second stop switch SB4 are all installed on the control panel in the electrical bypass cabinet in the form of buttons.

[0020] See also Figure 2 , the first contactor switch circuit includes a first contactor normally open main contact, and the second contactor switch circuit includes a second contactor normally open main contact. The first contactor KM1 normally open main contact and the second contactor KM2 normally open main contact are selected as examples for explanation;

[0021] One end of the normally open main contact of the first contactor KM1 is connected to the circuit breaker switch control circuit, and the other end of the normally open main contact of the first contactor KM1 is connected to the shore power supply through the shaft generator inverter, and the shaft generator inverter is also connected to the shaft generator. The ship in this embodiment is an international multi-purpose ship. The ship is equipped with a shaft generator and a shaft generator inverter. The shaft generator can be operated alone to achieve energy conservation and emission reduction, and can also be operated in parallel with a diesel generator to meet various working conditions. Equipped with a shore power access box to connect the shore power to the main power grid; the shaft generator uses the shaft generator inverter when the ship is sailing, and the shaft generator inverter is not used during the berthing period. The shore power supply only uses the shaft generator inverter when the ship is berthing. The shaft generator inverter has an interlocking function, so that the shaft generator power supply circuit and the shore power supply circuit are not closed at the same time; one end of the normally open main contact of the second contactor KM2 is connected to the circuit breaker switch control circuit, and the other end of the normally open main contact of the second contactor KM2 is connected to the shore power supply.

[0022] Specifically, before connecting the shore power supply, first close the circuit breaker QS in the electrical bypass cabinet;

[0023] When the shore power supply frequency is consistent with the ship power grid frequency, the shore power supply is not connected to the main distribution board through the frequency conversion device, that is, the shaft generator inverter. At this time, the second start switch SB2 in the electrical bypass cabinet is pressed, and the coil of the second contactor KM2 in the electrical bypass cabinet is energized, and the normally open auxiliary contact of the second contactor KM2 in the second contactor control circuit 2 is closed, so that the second contactor control circuit 2 is self-holding; the normally closed contact of the second contactor KM2 in the first contactor control circuit 1 is disconnected, so that the first contactor control circuit 1 is in a disconnected state, the coil of the first contactor KM1 is not energized, and the main contact of the second contactor KM2 is closed, disconnecting the shaft generator inverter from the shore power supply circuit, and the shore power supply is directly connected to the main distribution board through the electrical bypass cabinet to supply power to various equipment on the ship; after using the shore power supply, press the second stop switch SB4 to disconnect the connection between the electrical bypass cabinet and the main distribution board and the shore power supply.

[0024] When the frequency of the shore power supply is inconsistent with the frequency of the ship's power grid, press the first start switch SB1, the coil of the first contactor KM1 in the electrical bypass cabinet is energized, and the normally open auxiliary contact of the first contactor KM1 in the first contactor control circuit 1 is closed, so that the first contactor control circuit 1 is self-holding; the normally closed contact of the first contactor KM1 in the second contactor control circuit 2 is disconnected, so that the second contactor control circuit 2 is in a disconnected state, the coil of the second contactor KM2 is not energized, and the main contact of the first contactor KM1 is closed, so that the frequency conversion device, that is, the shaft generator inverter is connected to the electrical bypass cabinet, and the shore power supply is connected to the main distribution board through the shaft generator inverter. The shaft generator inverter converts its frequency into a frequency consistent with the ship's power grid and then supplies power to various equipment on board; after using the shore power supply, press the first stop switch SB3 to disconnect the connection between the electrical bypass cabinet and the main distribution board and the shore power supply.

[0025] To sum up, the present invention can make the normally open main contact of the first contactor in the first contactor switch circuit closed and in a conductive operating state by energizing the first contactor coil in the first contactor control circuit, so that the frequency of the shore power supply is converted into a frequency consistent with the ship's power grid through the ship's own shaft generator inverter, so that the ship can adapt to the shore power supply frequency of different ports. The shaft generator inverter is equipped on the ship, so the present invention shares the inverter with the shaft generator, which not only meets the requirements of energy conservation and emission reduction, but also saves costs.

[0026] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. All equivalent modifications or changes made by those skilled in the art without departing from the spirit and technical ideas disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A shore power frequency conversion device for a ship with a variable frequency shaft generator, comprising an electrical bypass cabinet, characterized in that: The electrical bypass cabinet is provided with a circuit breaker switch control circuit, a first contactor control circuit, a second contactor control circuit, a first contactor switch circuit and a second contactor switch circuit; One end of the circuit breaker switch control circuit is connected to the main switchboard, and the other end of the circuit breaker switch control circuit is respectively connected to the first contactor control circuit, the second contactor control circuit, the first contactor switch circuit and the second contactor switch circuit, the first contactor switch circuit is connected to the shore power supply through the shaft generator inverter, the second contactor switch circuit is connected to the shore power supply, and the first contactor switch circuit and the second contactor switch circuit are in a conducting operating state in response to control signals sent by the first contactor control circuit and the second contactor control circuit respectively to keep the shore power supply frequency consistent with the ship power grid frequency.

2. A shore power frequency conversion device for a ship with a variable frequency shaft generator according to claim 1, characterized in that: The circuit breaker switch control circuit includes a circuit breaker, a first fuse and a second fuse. One end of the circuit breaker is connected to the main distribution board, and the other end of the circuit breaker is connected to the first contactor switch circuit and the second contactor switch circuit respectively through the first fuse. The other end of the circuit breaker is also connected to the first contactor control circuit and the second contactor control circuit respectively through the second fuse.

3. The shore power frequency conversion device for a ship with a variable frequency shaft generator according to claim 1, characterized in that: The first contactor control circuit includes a first stop switch, a first contactor normally open auxiliary contact, a second contactor normally closed contact, a first contactor coil and a first starting switch, one end of the first stop switch is connected to the circuit breaker switch control circuit, the other end of the first stop switch, the first contactor normally open auxiliary contact, the second contactor normally closed contact and the first contactor coil are connected in series in sequence, the first contactor coil is also connected to the circuit breaker switch control circuit, and the first starting switch is connected in parallel with the first contactor normally open auxiliary contact.

4. The shore power frequency conversion device for a ship with a variable frequency shaft generator according to claim 1, characterized in that: The second contactor control circuit includes a second stop switch, a second contactor normally open auxiliary contact, a first contactor normally closed contact, a second contactor coil and a second starting switch, one end of the second stop switch is connected to the circuit breaker switch control circuit, the other end of the second stop switch, the second contactor normally open auxiliary contact, the first contactor normally closed contact and the second contactor coil are connected in series in sequence, the second contactor coil is also connected to the circuit breaker switch control circuit, and the second starting switch is connected in parallel to the second contactor normally open auxiliary contact.

5. The shore power frequency conversion device for a ship with a variable frequency shaft generator according to claim 1, characterized in that: The first contactor switch circuit includes a first contactor normally open main contact, one end of the first contactor normally open main contact is connected to the circuit breaker switch control circuit, and the other end of the first contactor normally open main contact is connected to the shore power supply through a shaft generator inverter, and the shaft generator inverter is also connected to the shaft generator.

6. The shore power frequency conversion device for a ship with a variable frequency shaft generator according to claim 1, characterized in that: The second contactor switch circuit includes a second contactor normally open main contact, one end of the second contactor normally open main contact is connected to the circuit breaker switch control circuit, and the other end of the second contactor normally open main contact is connected to the shore power supply.

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