A shore-based high-capacity direct-current automatic charging ship-shore connection system

Abstract

This utility model relates to a shore-based high-capacity DC automatic charging ship-to-shore connection system, comprising: a first GNSS signal antenna disposed on both sides of a power receiving socket on the ship; a first GNSS receiver disposed on the ship and connected to the first GNSS signal antenna for acquiring the location information of the power receiving socket; a first 4G module disposed on the power receiving socket and connected to the first GNSS receiver for transmitting the location information of the power receiving socket; a second GNSS signal antenna disposed at the end of the telescopic arm of a cable winch; a second GNSS receiver disposed on the cable winch and connected to the second GNSS signal antenna for acquiring the end position information of the telescopic arm; a second 4G module disposed on the cable winch for receiving the location information of the power receiving socket; and a PLC controller connected to the second 4G module and the second GNSS receiver. This ship-to-shore connection system acquires the coordinates of the power receiving socket and the end of the telescopic arm through GNSS signal antennas, with positioning accuracy unaffected by weather and light, meeting the requirements for all-weather shore power connection.

Description

Technical Field

[0001] This utility model relates to a ship-shore connection system, and more particularly to a shore-based high-capacity DC automatic charging ship-shore connection system. Background Technology

[0002] An automated charging shore connection system refers to providing electricity to a vessel during its berthing period via a shore-based power supply system, replacing the vessel's own power generation equipment. This reduces fuel consumption and pollutant emissions in port and provides charging services for electric vessels. It mainly includes a shore power supply system and a vessel power receiving system. The shore power supply system converts grid power into voltage and frequency levels required by the berthing vessel using transformers, converters, and isolation transformers, ultimately delivering it to the dock junction box. The vessel power receiving system is part of the vessel's power distribution system and mainly consists of cable winches, shipboard transformers, and an electrical management system.

[0003] Connectors are typically used for connection, including winch plugs and shipboard sockets (power receiving sockets). To meet the requirements of all-weather shore power connection, the reliability and compatibility of sensors need to be improved. Wired sensors offer advantages such as high positioning accuracy and immunity to environmental influences, but due to their wired nature, they cannot meet the requirements for automatic connection. Wireless sensors such as lidar, millimeter-wave radar, ultrasonic radar, and cameras are significantly affected by weather and lighting conditions in terms of positioning accuracy, and therefore cannot meet the requirements for all-weather shore power connection. Utility Model Content

[0004] To address the aforementioned problems, this utility model provides a shore-based, high-capacity DC automatic charging ship-to-shore connection system. The specific technical solution is as follows: A shore-based high-capacity DC automatic charging ship-to-shore connection system includes: a first GNSS signal antenna disposed on both sides of a power receiving socket on the ship; a first GNSS receiver disposed on the ship and connected to the first GNSS signal antenna for acquiring the location information of the power receiving socket; a first 4G module disposed on the power receiving socket and connected to the first GNSS receiver for transmitting the location information of the power receiving socket; a second GNSS signal antenna disposed at the end of the telescopic arm of a cable winch; a second GNSS receiver disposed on the cable winch and connected to the second GNSS signal antenna for acquiring the end location information of the telescopic arm; a second 4G module disposed on the cable winch for receiving the location information of the power receiving socket; and a PLC controller connected to the second 4G module and the second GNSS receiver respectively.

[0005] Preferably, the first GNSS signal antenna is symmetrically arranged on both sides of the power receiving socket.

[0006] Furthermore, the distance between the first GNSS signal antenna and the center of the power receiving socket is 3000mm. Two second GNSS signal antennas are provided, located at opposite ends of the telescopic arm.

[0007] Preferably, the device further includes: a walking motor encoder, mounted on the walking motor of the cable winch and connected to the PLC controller; a walking frequency converter, connected to both the PLC controller and the walking motor; a reel motor encoder, mounted on the reel of the cable winch; and a reel frequency converter, connected to both the PLC controller and the reel motor.

[0008] Compared with the prior art, the present invention has the following beneficial effects: This utility model provides a shore-based high-capacity DC automatic charging ship shore connection system that uses a GNSS signal antenna to obtain the coordinates of the power receiving socket and the end of the telescopic arm. The positioning accuracy is not affected by weather and light, and it can meet the requirements of all-weather shore power connection. In addition, it has a simple structure, low cost, and stable and reliable use. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of the structure of this application; Figure 2 This is a schematic diagram showing the connection between the first GNSS signal antenna and the power receiving socket; Figure 3 This is a schematic diagram of the assembly of the second GNSS signal antenna and the second 4G module on the cable winch. Figure 4 This is a control block diagram of the traveling motor and the reel motor of the cable winch. Detailed Implementation

[0010] The present invention will now be further described with reference to the accompanying drawings.

[0011] like Figures 1 to 3As shown, a shore-based high-capacity DC automatic charging ship-to-shore connection system includes a first GNSS signal antenna 1, a first GNSS receiver, a first 4G module, a second GNSS signal antenna 2, a second GNSS receiver, a second 4G module 3, and a PLC controller. The first GNSS signal antenna 1 is installed on both sides of a power socket 5 on the ship and connected to the first GNSS receiver. The first GNSS receiver can be installed on the power socket 5 and is used to acquire the location information of the power socket 5. The first 4G module is also installed on the power socket 5 and connected to the first GNSS receiver. The first 4G module is used to transmit the location information of the power socket 5. The second GNSS signal antenna 2 is installed at the end of the telescopic arm 71 of a cable winch 7 and connected to the second GNSS receiver. The second GNSS receiver is installed on the cable winch 7 and is used to acquire the end position information of the telescopic arm 71. The second 4G module 3 is installed on the cable winch 7 and is used to receive the location information of the power socket 5. The PLC controller is installed on the cable winch 7 and is connected to the second 4G module 3 and the second GNSS receiver, respectively.

[0012] The first GNSS signal antenna 1 and the second GNSS signal antenna 2 are fixed to both sides of the power receiving socket 5 via signal rod 13.

[0013] To improve positioning accuracy and facilitate control, the first GNSS signal antenna 1 is symmetrically positioned on both sides of the power receiving socket 5. Specifically, the distance between the first GNSS signal antenna 1 and the center of the power receiving socket 5 is 3000mm.

[0014] As a positioning sensor for shore power connection, the GNSS receiver uses GNSS signals based on the BeiDou satellite system (compatible with GPS, GLONASS, and Galileo) positioning data. It is unaffected by rain, snow, or light conditions, and its positioning accuracy can reach up to the centimeter level.

[0015] Cable winch 7 is a mobile cable winch that can move freely.

[0016] To achieve more precise docking and avoid interference, the second GNSS signal antenna 2 is provided in two parts, located at both ends of the telescopic arm 71. One part is located at the end of the outermost arm of the telescopic arm 71, and the other part is located at the end of the innermost arm of the telescopic arm 71, so that the spatial position of the entire telescopic arm 71 can be obtained after the telescopic arm 71 is extended.

[0017] The principle of automatic shore power connection is as follows: The cable winch 7 receives the latitude and longitude information from two first GNSS signal antennas 1. The center of the ship's power receiving socket 5 is located at the center of the two first GNSS signal antennas 1. The rotation angle of the telescopic arm 71 is adjusted so that the attitude angle of the telescopic arm 71 gradually approaches the attitude angle of the cable winch 7 and the ship's power receiving socket 5 until they are equal. At this time, the front and rear points of the telescopic arm 71 are on the same straight line as the center of the socket. Then the telescopic arm 71 extends, so that the plug 6 gradually approaches the power receiving socket 5 until the horizontal distance between the two is zero. Finally, the cable winch 7 conveying mechanism and the ship-connecting cable reel work together to lower the cable. The plug 6 is inserted into the power receiving socket 5. When the plug 6 is fully inserted, the bottom limit action of the power receiving socket 5 is triggered, and the power receiving socket 5 sends a signal that the plug 6 is in place. After receiving the signal, the cable winch 7 stops lowering the ship-connecting cable, and the entire automatic connection process ends.

[0018] The existing cable winch 7 has a synchronization problem when the first reel 72 of the cable winder is winding up and unwinding the cable and when the cable winder 7 is traveling. When the unwinding speed of the first reel 72 is less than the traveling speed of the cable winder 7, the cable will be subjected to a large tension, which will easily break the cable. When the unwinding speed of the first reel 72 is greater than the traveling speed of the cable winder 7, the cable will rub against the ground, which will easily cause wear on the surface of the cable.

[0019] like Figure 4 As shown, in order to solve the above problems, a shore-based high-capacity DC automatic charging ship-shore connection system also includes a walking motor encoder, a walking frequency converter, a reel motor encoder, and a reel frequency converter. The walking motor encoder is installed on the walking motor of the cable winch 7 and is connected to the PLC controller; the walking frequency converter is connected to both the PLC controller and the walking motor; the reel motor encoder is installed on the reel of the cable winch 7; the reel frequency converter is connected to both the PLC controller and the reel motor; the reel motor is installed on the first reel 72 and is used to drive the first reel 72 to rotate to realize the winding and unwinding of the cable.

[0020] An encoder is added to both the cable winch's travel motor and the cable reel motor. The encoder values ​​are sent to the PLC controller, which then calculates and controls the travel inverter and reel inverter of the cable winch 7 respectively, forming a dual closed-loop control system. The travel inverter operates in speed control mode, with a linear relationship between the input setting and the output frequency. The reel inverter operates in torque control mode, with a linear relationship between the input setting and the output torque. When the cable tension changes, the inverter adjusts the output frequency to suppress the tension change and maintain a constant output torque. When the cable winch 7 travels, regardless of the speed, the cable tension remains constant, thus achieving synchronization between the cable winch 7's travel and the cable reel's winding and unwinding.

[0021] The technical principles of this utility model have been described above with reference to specific embodiments. These descriptions are merely for explaining the principles of this utility model and should not be construed as limiting the scope of protection of this utility model in any way. Based on this explanation, those skilled in the art can readily conceive of other specific embodiments of this utility model without inventive effort, and these embodiments will all fall within the protection scope of the claims of this utility model.

Claims

1. A shore-based high-capacity DC automatic charging ship-shore connection system, characterized by, include: The first GNSS signal antenna (1) is located on both sides of the power receiving socket (5) of the ship; The first GNSS receiver is installed on the ship and connected to the first GNSS signal antenna (1) to obtain the location information of the power socket (5); The first 4G module is located on the power socket (5) and connected to the first GNSS receiver, and is used to transmit the location information of the power socket (5); The second GNSS signal antenna (2) is located at the end of the telescopic arm (71) of the cable winch (7); The second GNSS receiver is mounted on the cable winch (7) and connected to the second GNSS signal antenna (2) to obtain the end position information of the telescopic arm (71); The second 4G module (3) is located on the cable winch (7) and is used to receive the location information of the power socket (5); as well as The PLC controller is connected to the second 4G module (3) and the second GNSS receiver, respectively.

2. A shore connection system for a high-capacity DC automatic charging vessel according to claim 1, characterized in that, The first GNSS signal antenna (1) is symmetrically arranged on both sides of the power receiving socket (5).

3. A shore connection system for a high-capacity DC automatic charging ship according to claim 2, characterized in that, The distance between the first GNSS signal antenna (1) and the center of the power receiving socket (5) is 3000mm.

4. A shore connection system for a high-capacity DC automatic charging ship according to claim 2, characterized in that, The second GNSS signal antenna (2) is provided in two parts, located at both ends of the telescopic arm (71).

5. A shore-based high-capacity DC automatic charging ship-shore connection system according to claim 1, characterized in that, Also includes: The walking motor encoder is installed on the walking motor of the cable winch (7) and connected to the PLC controller; The walking frequency converter is connected to both the PLC controller and the walking motor. A reel motor encoder is mounted on the reel of the cable winch (7); as well as The reel frequency converter is connected to both the PLC controller and the reel motor.

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