Wide, efficient and multipurpose ship shore-based power supply system

Abstract

The utility model belongs to the technical field of shore power, and particularly relates to a wide, efficient and multipurpose ship shore-based power supply system. Comprising a high-capacity shore-based variable-frequency power supply subsystem and a multi-power-system interface low-voltage shore power supply subsystem, the high-capacity shore-based variable-frequency power supply subsystem comprises a high-voltage power supply incoming line, a step-down transformer, a variable-frequency and variable-voltage device and an isolation transformer which are connected in sequence; the multi-power-system interface low-voltage shore power supply subsystem comprises a low-capacity shore power output system, an output automatic switching interlocking protection system and multi-interface low-voltage shore power which are connected in sequence; according to the power supply system designed in the scheme, through deepening design processing on an existing shore power system, multiple switching of shore power interfaces is achieved, the application range is wide, energy efficiency consumption is low, the equipment utilization rate is greatly improved, the actual problem of connection of shore power at a wharf is solved, and a good solution is provided for popularization of shore power use full coverage.

Description

Technical Field

[0001] This utility model belongs to the field of shore power technology, specifically, it relates to a wide-ranging, high-efficiency, multi-purpose ship shore-based power supply system. Background Technology

[0002] Shore power technology for ships refers to the technology that allows ships to stop using their onboard generators while berthing in port and instead use shore (land) power sources to meet their electricity needs during berthing. Therefore, shore power equipment is needed to supply power to ships. Currently, the construction of shore power equipment in ports and wharves is being carried out on a large scale, and the adoption rate of shore power is getting higher and higher.

[0003] To meet the needs of regular multi-purpose port operations, the vessels berthed at port berths are often diverse, ranging in tonnage from several thousand tons to hundreds of thousands of tons. Since the shore power capacity used by different tonnage vessels varies (from several kilowatts to several megawatts), the shore power projects currently being built in various regions are mainly aimed at large vessels with high electricity consumption. To meet the power needs of large vessels, most wharves are basically built with large-capacity high and low voltage variable frequency shore power systems to provide variable frequency and voltage shore power for berthed large vessels. Although large ships consume a large amount of electricity, their berthing time is short, resulting in low utilization rates. Many port terminals, especially those along the Yangtze River and coastal inland basins, primarily berth small and medium-sized ships, whose shore power needs are mostly low-capacity industrial frequency power. Currently, ports use two methods to power berthed ships: one is to build two independent shore power systems to supply power to ships with different power needs, resulting in redundant investment and significant resource waste, while also occupying limited operational space at the wharf; the other is to use high-capacity variable frequency shore power to supply power to small-capacity ships, creating a situation where the system is oversized, leading to high system idle time and low power supply efficiency. Furthermore, the energy generated by the shore power system when supplying power to small-capacity ships requires extensive cooling equipment. This mismatch between ship-shore supply and demand has become the biggest obstacle to the normal operation of low-voltage shore power systems, restricting their efficient and widespread use. There is an urgent need for a versatile, efficient, and multi-purpose shore power supply system for ships to meet the shore power needs of various types of vessels. Utility Model Content

[0004] To address the aforementioned problems in existing technologies, the purpose of this utility model is to provide a versatile, efficient, and multi-purpose shore power supply system for ships. This system can provide a variety of shore power supplies, including high-voltage, low-voltage, multi-frequency, large-capacity, three-phase, and single-phase power sources, to meet the needs of various ships using shore power and for various interface connections. It improves the utilization rate of shore power equipment and can adaptively select the operation and switching of equipment according to the power capacity requirements of berthed ships, thereby increasing the system's load rate, reducing the system's no-load loss, and improving the utilization rate and efficiency of the equipment.

[0005] To solve the above problems, the technical solution adopted by this utility model is as follows:

[0006] A wide-range, high-efficiency, multi-purpose ship shore power supply system, the power supply system including a high-capacity shore-based frequency converter power supply electronic system and a multi-mode interface low-voltage shore power supply electronic system;

[0007] The high-capacity shore-based frequency converter power supply system includes a high-voltage power input line, a step-down transformer, a frequency converter, and an isolation transformer connected in sequence. The isolation transformer is connected to both a high-capacity low-voltage shore power output line and a high-capacity high-voltage shore power output line. The high-capacity high-voltage shore power output line is connected to a high-voltage shore power box that can output power.

[0008] The multi-interface low-voltage shore power supply system includes a small-capacity shore power output system, an automatic output switching interlocking protection system, and a multi-interface low-voltage shore power supply capable of outputting power, connected in sequence. The large-capacity low-voltage shore power output line is connected to the automatic output switching interlocking protection system. The voltage output by the multi-interface low-voltage shore power supply is lower than the voltage output by the high-voltage shore power box.

[0009] The step-down transformer further distributes voltage to the auxiliary power system and the small-capacity shore power output system through an energy distribution system. The auxiliary power system is configured to provide lighting, HVAC, and necessary low-voltage power supply. The energy distribution system is configured to distribute the remaining energy of the auxiliary power system to the small-capacity shore power output system.

[0010] The power supply system also includes a PLC control system for program-controlled operation of the auxiliary power supply system, the high-capacity shore-based frequency converter power supply system, and the multi-mode interface low-voltage shore power supply system.

[0011] Furthermore, the power supply system also includes a multi-system transformer ratio switching metering system, which is connected to the large-capacity low-voltage shore power output line and the output automatic switching interlocking protection system. The PLC control system modifies the transformer ratio of the multi-system transformer ratio switching metering system through communication to complete the sampling switching.

[0012] Furthermore, the automatic output switching interlocking protection system converts the TN power supply to the ITn power supply through a system conversion method.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0014] (1) This solution adopts a movable interface loop to provide multi-standard interface shore power access services for berthed ships, which meets the connection and use of all types of ships and greatly improves the efficiency of shore power system.

[0015] (2) This scheme, through the design of the energy distribution system, stops the use of frequency converter without changing the original shore power system configuration, greatly reducing the energy demand of the environmental control system. At the same time, it converts the original environmental control power supply energy for the operation of the frequency converter system into shore power supply for small-capacity industrial frequency shore power ships, and provides shore power access for berthed ships through low-voltage extension interfaces to meet the shore power needs of ships.

[0016] (3) This scheme adds a multi-voltage ratio switching metering system, which can perform sampling switching according to the current transformers configured with different output switches, thereby providing high-precision shore power metering and meeting the metering needs of a wide range of shore power outputs;

[0017] (4) The power supply system designed in this scheme has achieved multiple transfers of the shore power interface through the in-depth design of the existing shore power system. It has a wide range of applications, low energy consumption, and greatly improves the utilization rate of equipment. It solves the practical problem of dock connecting to shore power and provides a good solution for promoting the full coverage of shore power use. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the system module structure of the power supply system in this utility model;

[0019] Figure 2 This is a schematic diagram of the circuit connection structure of the power supply system in this utility model. Detailed Implementation

[0020] The present invention will be further described below with reference to specific embodiments.

[0021] like Figure 1 and Figure 2 As shown, the wide-range, high-efficiency, multi-purpose ship shore power supply system of this utility model includes a large-capacity shore-based frequency converter power supply system and a multi-mode interface low-voltage shore power supply system.

[0022] The large-capacity shore-based frequency converter power supply system includes a high-voltage power input line, a step-down transformer, a frequency converter, and an isolation transformer connected in sequence. The isolation transformer is connected to both a large-capacity low-voltage shore power output line and a large-capacity high-voltage shore power output line. The large-capacity high-voltage shore power output line is connected to a high-voltage shore power box that can output power.

[0023] The multi-interface low-voltage shore power supply system includes a small-capacity shore power output system, an automatic output switching interlocking protection system, and a multi-interface low-voltage shore power supply capable of outputting power, connected in sequence. The large-capacity low-voltage shore power supply is connected to the automatic output switching interlocking protection system. The voltage output by the multi-interface low-voltage shore power supply is lower than the voltage output by the high-voltage shore power box.

[0024] The step-down transformer also distributes voltage to the auxiliary power system and the small-capacity shore power output system through an energy distribution system. The auxiliary power system is configured to provide lighting, HVAC and necessary low-voltage power supply, and the energy distribution system is configured to distribute the remaining energy of the auxiliary power system to the small-capacity shore power output system.

[0025] The power supply system also includes a PLC control system that performs program control on the auxiliary power supply system, the high-capacity shore-based frequency converter power supply system, and the multi-mode interface low-voltage shore power supply system.

[0026] Therefore, when the receiving vessel is a large-capacity, high-voltage shore power vessel (i.e., a vessel of 50,000-180,000 tons), the system can start the large-capacity frequency converter power supply equipment. The power is then connected to the high-voltage socket of the high-voltage shore power box via the low-voltage output of the isolation transformer, and then connected to the high-voltage plug of the berthed vessel, providing the berthed vessel with 6KV / 50Hz or 6.6KV / 60Hz high-voltage frequency converter shore power. Simultaneously, the auxiliary power system starts fans, air conditioners, etc., to provide necessary ventilation and heat dissipation for the large-capacity shore-based frequency converter power supply electronic system, meeting the equipment's operational requirements.

[0027] When the receiving vessel is powered by a large-capacity low-voltage shore power supply, the system starts the frequency converter equipment to change the voltage and frequency. The low-voltage output terminal of the isolation transformer is connected to the large-capacity socket (4*250A) of the low-voltage shore power box, which is then connected to the low-voltage plug of the berthed vessel. This provides the berthed vessel with 0.4KV / 50Hz or 0.45KV / 60Hz low-voltage frequency converter shore power. At the same time, the auxiliary power system starts the fans, air conditioners, etc., to provide the necessary ventilation and heat dissipation for the electronic system of the large-capacity shore-based frequency converter power supply, meeting the operating requirements of the equipment.

[0028] When the receiving vessel uses a small-capacity shore power supply, the system does not activate the frequency converter equipment, significantly reducing the overall heat dissipation. In this case, the surplus capacity of the auxiliary power supply can be fully utilized. This capacity is then connected to small-capacity sockets (125A, 63A three-phase, 63A single-phase) in the low-voltage shore power box via the energy distribution system, providing a small capacity of industrial frequency shore power to the receiving vessel. This method of distributing the surplus energy of the auxiliary power system to the low-voltage, small-capacity shore power supply improves the utilization rate of the existing auxiliary power supply. Furthermore, the energy distribution system, under the control of the PLC control system, can rationally allocate the system's output power according to the interface current, meeting the capacity requirements of the connection interface.

[0029] This power supply system also includes a multi-voltage system switching metering system. This system is connected to both the high-capacity low-voltage shore power outgoing line and the output automatic switching interlocking protection system. The PLC control system modifies the turns ratio of the multi-voltage system switching metering system via communication to complete the sampling switching. Specifically, this multi-voltage system switching metering system can automatically switch the corresponding current and voltage sampling devices based on the data acquisition of the connection status of the connection interfaces, automatically changing the turns ratio settings of the acquisition instruments to ensure the system's sampling accuracy and meet the metering requirements of the equipment.

[0030] In addition, the automatic switching interlocking protection system can convert the original TN power supply for the environmental control (ventilation and heat dissipation) of the frequency converter system into the ITn standard power supply required by the ship without changing the original shore power system configuration. This provides shore power supply for small-capacity industrial frequency shore power ships and meets the power supply needs of the ship's shore power.

[0031] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0032] (1) This solution adopts a movable interface loop to provide multi-standard interface shore power access services for berthed ships, which meets the connection and use of all types of ships and greatly improves the efficiency of shore power system.

[0033] (2) This scheme, through the design of the energy distribution system, stops the use of frequency converter without changing the original shore power system configuration, greatly reducing the energy demand of the environmental control system. At the same time, it converts the original environmental control power supply energy for the operation of the frequency converter system into shore power supply for small-capacity industrial frequency shore power ships, and provides shore power access for berthed ships through low-voltage extension interfaces to meet the shore power needs of ships.

[0034] (3) This scheme adds a multi-voltage ratio switching metering system, which can perform sampling switching according to the current transformers configured with different output switches, thereby providing high-precision shore power metering and meeting the metering needs of a wide range of shore power outputs;

[0035] (4) The power supply system designed in this scheme has achieved multiple transfers of the shore power interface through the in-depth design of the existing shore power system. It has a wide range of applications, low energy consumption, and greatly improves the utilization rate of equipment. It solves the practical problem of dock connecting to shore power and provides a good solution for promoting the full coverage of shore power use.

Claims

1. A versatile, efficient, and multi-purpose ship-based shore power supply system, characterized in that: The power supply system includes a high-capacity shore-based frequency converter power supply system and a multi-mode interface low-voltage shore power supply system. The high-capacity shore-based frequency converter power supply system includes a high-voltage power input line, a step-down transformer, a frequency converter, and an isolation transformer connected in sequence. The isolation transformer is connected to both a high-capacity low-voltage shore power output line and a high-capacity high-voltage shore power output line. The high-capacity high-voltage shore power output line is connected to a high-voltage shore power box that can output power. The multi-interface low-voltage shore power supply system includes a small-capacity shore power output system, an automatic output switching interlocking protection system, and a multi-interface low-voltage shore power supply capable of outputting power, connected in sequence. The large-capacity low-voltage shore power output line is connected to the automatic output switching interlocking protection system. The voltage output by the multi-interface low-voltage shore power supply is lower than the voltage output by the high-voltage shore power box. The step-down transformer further distributes voltage to the auxiliary power system and the small-capacity shore power output system through an energy distribution system, which is configured to distribute the remaining energy of the auxiliary power system to the small-capacity shore power output system. The power supply system also includes a PLC control system for program-controlled operation of the auxiliary power supply system, the high-capacity shore-based frequency converter power supply system, and the multi-mode interface low-voltage shore power supply system.

2. The wide-ranging, high-efficiency, multi-purpose ship shore-based power supply system according to claim 1, characterized in that, The power supply system also includes a multi-voltage transformer ratio switching metering system, which is connected to the large-capacity low-voltage shore power output line and the output automatic switching interlocking protection system. The PLC control system modifies the transformer ratio of the multi-voltage transformer ratio switching metering system through communication to complete the sampling switching.

3. The wide-ranging, high-efficiency, multi-purpose ship shore-based power supply system according to claim 1, characterized in that, The automatic output switching interlocking protection system converts TN power supply to ITn power supply through a standard conversion method.

4. The wide-ranging, high-efficiency, multi-purpose ship shore-based power supply system according to claim 1, characterized in that, The auxiliary power system is configured to provide lighting, HVAC, and necessary low-voltage power.

5. The wide-ranging, high-efficiency, multi-purpose ship shore-based power supply system according to claim 1, characterized in that, The high-voltage shore power box is configured to supply power to ships of 50,000-180,000 tons.

6. The wide-ranging, high-efficiency, multi-purpose ship shore-based power supply system according to claim 1, characterized in that, The multi-interface low-voltage shore power supply is configured to provide power to ships of 5,000-30,000 tons.

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