A multi-power detection and adaptive control system for ship shore power

Abstract

The present invention discloses a multi-electricity detection and adaptive control system for ship shore power, which relates to the field of port power supply technology. It includes a shore power component, which includes a power grid, a power supply side switch cabinet, a frequency conversion and voltage conversion device, and a switch cabinet at the ship-shore connection; a ship power component, which includes a ship's diesel generator, a ship load, a ship power bus, a ship's high-voltage distribution unit, a ship's low-voltage distribution unit, a ship's side switch cabinet, and a ship's AIS; a shore power system master controller connected to the shore power frequency conversion and voltage conversion device and the ship's diesel generator respectively, the shore power system master controller is connected to the shore power frequency conversion and voltage conversion device, the ship's diesel generator, the port AIS base station, and the ship's electricity system database, and the ship power station SCADA system is connected to the shore power system master controller. The advantages of the present invention are: it is adaptable to a variety of electricity system ship power systems, automatically adjusts the voltage and frequency, and improves the adaptability of the shore power system to ships with different electricity systems.

Description

Technical Field

[0001] The present invention relates to the technical field of port power supply, and in particular to a ship shore power multi-system detection and adaptive control system. Background Art

[0002] With the vigorous development of the shipping industry, the International Maritime Organization has increasingly higher requirements for ship emissions. Shore power technology has become one of the key technologies for building green ports with its low pollution, no noise and low cost. However, in traditional shore power systems, a variety of shore power systems are usually used to adapt to ships with different power systems. The selection of voltage levels in countries around the world is consistent with the parameters of their own land power systems, making ship electrical equipment universal. For example, the United States and Japan use 450V and 60Hz power systems, while my country uses 400V and 50Hz power systems. Similarly, the rated frequency of AC ship power systems generally follows the frequency standards on land in various countries. my country uses 50Hz and the United States uses 60Hz. At present, domestic shore power systems generally use different shore power devices for ships with different power systems, which operate separately and occupy a large port space.

[0003] At present, the port's low-voltage ship shore power system needs to provide power with multiple combinations of voltages of 400 / 440 / 690V and frequencies of 50 / 60Hz. Given the limited operating space at the port, it is necessary to adopt a shore power system that can automatically adapt to a variety of different power systems. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a ship shore power multi-power system detection and adaptive control system, which can solve the problems of the current domestic shore power system requiring different shore power devices for ships with different power systems, the single application of shore power devices, the small range of applicable ships, the large space occupation and the high cost.

[0005] In order to solve the above technical problems, the technical solution of the present invention is as follows: comprising a shore power component, the shore power component comprising a power grid, a power supply side switch cabinet, a frequency conversion and voltage conversion device, and a ship-shore connection switch cabinet, the power supply side switch cabinet is connected to the mains, and the frequency conversion and voltage conversion device comprises a voltage conversion cabinet of three voltage levels of 400 / 440 / 690V and a frequency conversion cabinet of two frequencies of 50 / 60Hz;

[0006] A ship power assembly, the ship power assembly includes a ship diesel generator, a ship load, a ship power bus, a ship high-voltage distribution unit, a ship low-voltage distribution unit, a ship side switch cabinet, and a ship AIS. The diesel generator, the ship high-voltage distribution unit, the ship low-voltage distribution unit, and the shore power frequency conversion and voltage conversion device are connected through the ship power bus;

[0007] A shore power system master controller connected to the shore power frequency conversion and voltage conversion device and the ship's diesel generator through a DP bus, respectively. The shore power system master controller is connected to the shore power frequency conversion and voltage conversion device and the ship's diesel generator and is used to collect and adjust the shore voltage, frequency and the ship voltage, frequency. The shore power system master controller is connected to the port AIS base station, the port AIS base station is connected to the ship AIS and is used for ship identification, connected to the ship's electrical system database and used for ship information retrieval, update interaction, connected to the ship-shore connection switch cabinet and the ship-side switch cabinet for parallel and off-grid closing and disconnection, the diesel generator, the ship load, and the ship power station SCADA system communicate through Ethernet, and the ship power station SCADA system is connected to the shore power system master controller through a DP bus.

[0008] The advantages of the present invention are: using a set of shore power equipment, it can automatically detect the power system of the docked ship, compare the detection result with the ship power system database, adapt to ship power systems of various power systems, automatically adjust the voltage and frequency, save dock operating space, improve the adaptability of the shore power system to ships with different power systems, simplify complex operating procedures, make it more convenient and safe, and reduce costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is the topology diagram of multi-power detection and adaptive control system for ship shore power;

[0010] Figure 2 Electrical diagram for multi-power detection and adaptive control system for ship shore power;

[0011] Figure 3 This is the grid connection flow chart of the ship shore power multi-power detection and adaptive control system. DETAILED DESCRIPTION

[0012] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0013] In order to make the purpose, technical solution and advantages of the present invention more clear, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. The following embodiments can enable technicians in this field to understand the present invention more comprehensively, but the present invention is not limited to the scope of the embodiments.

[0014] like Figure 1 As shown, this specific embodiment adopts the following technical solution: it includes a shore power component, the shore power component includes a power grid 1, a power side switch cabinet SE1, a frequency conversion and voltage conversion device 3, and a ship-shore connection switch cabinet SE2, the power side switch cabinet SE1 is connected to the mains, and the frequency conversion and voltage conversion device 3 includes a transformer cabinet 31 with three voltage levels of 400 / 440 / 690V and a frequency conversion cabinet 32 ​​with two frequencies of 50 / 60Hz;

[0015] A ship power component, the ship power component includes a ship diesel generator 5, a ship load 6, a ship power bus, a ship high-voltage distribution unit, a ship low-voltage distribution unit and a ship side switch cabinet SE3, a ship AIS7, and the diesel generator 5, the ship high-voltage distribution unit, the ship low-voltage distribution unit and the shore power frequency conversion and voltage conversion device 3 are connected through the ship power bus;

[0016] A shore power system master controller 10 is connected to the shore power frequency conversion and voltage transformation device 3 and the ship's diesel generator 5 through the DP bus 8 respectively. The shore power system master controller 10 is connected to the shore power frequency conversion and voltage transformation device 3 and the ship's diesel generator 5 and is used to collect and adjust the shore voltage, frequency and the ship voltage and frequency. The shore power system master controller 10 is connected to the port AIS base station 12, the port AIS base station 12 is connected to the ship AIS7 and is used for ship identification, and is connected to the ship power system database 11 and is used for ship information retrieval, update interaction, and is connected to the ship-shore connection switch cabinet SE2 and the ship-side switch cabinet SE3 for parallel and off-grid switching. The diesel generator 5, the ship load 6, and the ship power station SCADA system 9 are Ethernet communications, and the ship power station SCADA system 9 is connected to the shore power system master controller 10 through the DP bus 8.

[0017] Grid power supply 1: Power supply for shore power system, 10kV for conventional grid ac; power supply side switch cabinet SE1: when the frequency conversion and voltage conversion device 3 fails, it plays the role of power failure protection; frequency conversion and voltage conversion device 3: converts the grid power supply 1 into a power supply suitable for the ship at the port; ship-shore connection switch cabinet SE2: when it meets the grid connection requirements, it closes the switch and connects to the grid; ship-side switch cabinet SE3: when the shore power fails, it disconnects to ensure the safety of the ship's power grid; diesel generator 5: the speed can be adjusted externally to adjust the phase; ship load 6: the ship load that does not exceed the capacity of the shore power system; ship AIS7: can send ship information including ship name, ship type, etc.; DP bus 8: used to transmit monitoring signals and send control signals; ship power station SCADA system 9: real-time monitoring and collection of ship power grid operation status, and control the ship power grid; shore power system master controller 10: adjust the shore-side frequency conversion and voltage conversion device 3 and the ship-side diesel generator 5, and exchange information with the ship power system database 11; ship power system database 11: the terminal records the power system information of the berthing ship and compares it with the real-time power system of the berthing ship; port AIS base station 12: identifies the berthing ship information, including ship name, ship type, etc.

[0018] The power supply side switch cabinet SE1, the frequency conversion and voltage conversion device 3, the ship-shore connection switch cabinet SE2, the ship-side switch cabinet SE3 and the shore power system master controller 10 are connected through the DP bus 8. The DP communication is high-speed and low-cost, and is used for the communication between the equipment-level control system and the distributed I / O. It is transmitted by optical cable through the port RS-485. The shore power system master controller 10 can control the circuit breakers of the power supply side switch cabinet SE1, the ship-shore connection switch cabinet SE2 and the ship-side switch cabinet SE3 to open and close, and can be connected to the frequency conversion and voltage conversion device 3 to select a suitable frequency conversion and voltage conversion device, and control the frequency conversion cabinet 32 ​​to connect to the grid and close. The shore power system master controller 10 and the port AIS base station 12 are connected using an Ethernet interface and execute the TCP / IP protocol. The shore power system master controller 10 confirms the ship type and information according to the feedback information of the port AIS base station 12.

[0019] The diesel generator 5, the ship load 6 and the ship power station SCADA system 9 communicate with each other via Ethernet, and are converted to DP communication mode through a transfer interface and connected to the shore power system master controller 10.

[0020] The ship power system database 11 is connected to the shore power system master controller 10 through an Ethernet interface. The ship power system database 11 is retrieved according to the feedback information of the port AIS base station 12 to confirm the relevant power system information of the berthing ship.

[0021] like Figure 2 As shown, the electrical connection diagram of the ship shore power multi-electricity detection and adaptive control system includes: a grid power supply 1, a power supply side switch cabinet SE1, a transformer cabinet 31, a frequency conversion cabinet 32, an isolation transformer 33, a ship-shore connection switch cabinet SE2, and a variety of different electrical system ship loads 6.

[0022] Figure 2 In the diagram, the grid power supply 1 to the power supply side switch cabinet SE1 and the power supply side switch cabinet SE1 to the transformer cabinet 31 are 10kV / 50Hz mains power; from the transformer cabinet 31 to the frequency converter cabinet 32, there are three different specifications of transformers to choose from, which are 400 / 440 / 690V, 50Hz power; from the frequency converter cabinet 32 ​​to the isolation transformer 33, after two inverters, 50 / 60Hz current is generated, including 400 / 440 / 690V, 50 / 60Hz six power systems; the isolation transformer 33 plays the role of shore side isolation protection, isolating the current of the primary and secondary windings; the isolation transformer 33 to the ship load 6 connects the shore power of the corresponding power system to the docked ship to supply power to the load.

[0023] like Figure 3 The following is the working process of the ship shore power multi-power detection and adaptive control system. Figure 1 and Figure 3When the ship docks, the port AIS base station 12 identifies the ship name, ship type and other information through the ship AIS 7, and transmits it to the shore power system master controller 10 through the DP bus 8. The shore power system master controller 10 and the ship power system database 11 use half-duplex communication to query the ship power grid data; through Ethernet communication, the real-time voltage, frequency, phase and other information of the ship load 6 is transmitted to the ship power station SCADA system 9, and transmitted to the shore power system master controller 10 through the DP bus 8; the shore power system master controller 10 compares the real-time ship parameters F ([U, f]) with the record F ([U0, f0]) in the ship power system database 11.

[0024] When the real-time parameter F ([U, f]) of the ship does not conform to the data record F ([U0, f0]) in the ship power database 11, the system alarms for manual diagnosis. When the information in the ship power database 11 is missing or wrong, the system confirms with the ship and inputs the new ship power information into the ship power database 11. When the ship power grid is overvoltage or undervoltage, the grid connection is stopped and the ship repairs the fault in the ship power grid. When the real-time parameter F ([U, f]) of the ship conforms to the record F ([U0, f0]) in the ship power database 11, the shore power system master controller 10 adjusts the frequency conversion and voltage conversion device 3 to adapt to the power system of the berthed ship. When the shore power system master controller 10 confirms that the grid connection conditions are met, the switch cabinet SE2 at the ship-shore connection and the ship-side switch cabinet SE3 are closed. At the same time, the shore power system master controller 10 adjusts the frequency conversion and voltage conversion device 3 and the ship's diesel generator 5 for load transfer. The load is transferred from the ship-side generator to the shore-side power supply, and the ship's diesel generator 5 is turned off, and the grid connection is completed.

[0025] Introducing the function F([U,f]) and the norm The real-time voltage U and frequency f of the ship power grid are judged, and the ship voltage and frequency are converted into a parameter matrix, that is,

[0026]

[0027] Among them, the definition norm

[0028]

[0029]

[0030] .

[0031] The function output value and corresponding information are shown in the table above. When the function F ([U, f]) outputs the corresponding ship power grid system, it is compared with the information in the ship power system database 11 to determine whether they are consistent. When the voltage and frequency do not meet the grid connection requirements, an alarm is issued and the manual operation is transferred to perform fault diagnosis and elimination. After the fault is resolved, the judgment is made again.

[0032] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A ship shore power multi-power detection and adaptive control system, characterized by: It includes a shore power component, which includes a power grid, a power supply side switch cabinet, a frequency conversion and voltage conversion device, and a ship-shore connection switch cabinet. The power supply side switch cabinet is connected to the mains. The frequency conversion and voltage conversion device includes a voltage conversion cabinet with three voltage levels of 400 / 440 / 690V and a frequency conversion cabinet with two frequencies of 50 / 60Hz; A ship power assembly, the ship power assembly includes a ship diesel generator, a ship load, a ship power bus, a ship high-voltage distribution unit, a ship low-voltage distribution unit, a ship side switch cabinet, and a ship AIS. The diesel generator, the ship high-voltage distribution unit, the ship low-voltage distribution unit, and the shore power frequency conversion and voltage conversion device are connected through the ship power bus; A shore power system master controller connected to the shore power frequency conversion and voltage conversion device and the ship's diesel generator through a DP bus, respectively. The shore power system master controller is connected to the shore power frequency conversion and voltage conversion device and the ship's diesel generator and is used to collect and adjust the shore voltage and frequency and the ship's voltage and frequency. The shore power system master controller is connected to the port AIS base station, the port AIS base station is connected to the ship's AIS and is used for ship identification, connected to the ship's electrical system database and used for ship information retrieval, update interaction, and connected to the ship-shore connection switch cabinet and the ship-side switch cabinet for parallel and off-grid switching. The diesel generator, ship load, and ship power station SCADA system communicate through Ethernet, and the ship power station SCADA system is connected to the shore power system master controller through a DP bus; When the ship docks, the port AIS base station identifies the ship name and type information through the ship AIS, and transmits it to the shore power system master controller through the DP bus. The shore power system master controller and the ship power system database use half-duplex communication to query the ship power grid data; the real-time voltage, frequency and phase information of the ship load is transmitted to the ship power station SCADA system through Ethernet communication, and then transmitted to the shore power system master controller through the DP bus; the shore power system master controller compares the real-time ship parameter F ([U, f]) with the record F ([U0, f0]) in the ship power system database; When the ship's real-time parameter F ([U, f]) does not conform to the data record F ([U0, f0]) in the ship's electrical system database, the system alarms for manual diagnosis. When the information in the ship's electrical system database is missing or wrong, the system confirms with the ship and enters the new ship's electrical system information into the ship's electrical system database. When the ship's power grid is overvoltage or undervoltage, the grid connection is stopped and the ship repairs the fault in the ship's power grid. When the ship's real-time parameter F ([U, f]) conforms to the record F ([U0, f0]) in the ship's electrical system database, the shore power system master controller adjusts the frequency conversion and voltage conversion device to adapt to the electrical system of the berthed ship. When the shore power system master controller confirms that the grid connection conditions are met, the switch cabinet at the ship-shore connection and the ship's side switch cabinet are closed. At the same time, the shore power system master controller adjusts the frequency conversion and voltage conversion device and the ship's diesel generator for load transfer. The load is transferred from the ship-side generator to the shore-side power supply, and the ship's diesel generator is turned off, and the grid connection is completed.

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