CN223986958U - High-voltage shore power grid-connected system - Google Patents
High-voltage shore power grid-connected systemInfo
- Publication number
- CN223986958U CN223986958U CN202520560793.6U CN202520560793U CN223986958U CN 223986958 U CN223986958 U CN 223986958U CN 202520560793 U CN202520560793 U CN 202520560793U CN 223986958 U CN223986958 U CN 223986958U
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- shore power
- voltage
- power grid
- protection device
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Abstract
The utility model relates to the technical field of ship shore power, in particular to a high-voltage shore power grid-connected system. The high-voltage shore power grid-connected system comprises a high-voltage shore power generator and a shore power grid-connected cabinet, wherein the shore power grid-connected cabinet is provided with a first current input end, a second current input end and a bus, the first current input end is electrically connected with the high-voltage shore power generator, the second current input end is electrically connected with a ship generator, the bus is connected with a ship load, a first microcomputer protection device, a second microcomputer protection device and a grid-connected synchronization device are arranged in the shore power grid-connected cabinet, and automatic synchronization detection and accurate switching-on of the high-voltage shore power and the ship power are realized through cooperative control of the first microcomputer protection device and the second microcomputer protection device and the PLC.
Description
Technical Field
The utility model relates to the technical field of ship shore power, in particular to a high-voltage shore power grid-connected system.
Background
The ship shore power technology mainly utilizes a shore power supply to provide electric energy for ships at a berth, replaces a part of self diesel generator sets of the ships, thereby effectively reducing the emission, noise and vibration of the ships and having important significance for environmental protection.
With the continuous rise of the scale and power requirements of ships, the conventional low-voltage shore power system (such as 440V) is difficult to meet the power supply requirements of large-capacity ships, and particularly, in the case that a high-voltage main switchboard (usually 6600V) of a large-sized container ship cannot be directly connected to the shore power system, the low-voltage shore power system is limited by the limit current value of a circuit breaker, so that high-power supply is difficult to realize.
Disclosure of utility model
The utility model provides a high-voltage shore power grid-connected system which can overcome certain or certain defects in the prior art.
The high-voltage shore power grid-connected system comprises a high-voltage shore power generator and a shore power grid-connected cabinet, wherein the shore power grid-connected cabinet is provided with a first current input end, a second current input end and a bus, the first current input end is electrically connected with the high-voltage shore power generator, the second current input end is electrically connected with a ship generator, the bus is connected with a ship load, a first microcomputer protection device, a second microcomputer protection device and a grid-connected synchronization device are arranged in the shore power grid-connected cabinet, the first microcomputer protection device and the second microcomputer protection device are electrically connected with the bus, the first microcomputer protection device is electrically connected with the first current input end, a first high-voltage circuit breaker is connected between the first microcomputer protection device and the first current input end, and the grid-connected synchronization device is respectively electrically connected with the first microcomputer protection device, the second microcomputer protection device and the first high-voltage circuit breaker.
In a preferred embodiment of the utility model, the synchronization device comprises a PLC having a first signal access port and a second signal access port, the first signal access port and the second signal access port being electrically connected to the first microcomputer protection device and the second microcomputer protection device, respectively, and using Modbus-TCP communication protocol.
In a preferred embodiment of the utility model, the PLC is further provided with a first control port, a second control port is correspondingly arranged at the first high-voltage circuit breaker, and the first control port is electrically connected with the second control port.
In the preferred embodiment of the utility model, the PLC is further provided with a first feedback port, a second feedback port is correspondingly arranged at the first high-voltage circuit breaker, and a first opening and closing state sensor is connected between the first feedback port and the second feedback port.
In the preferred embodiment of the utility model, a touch screen is further arranged at the outer wall of the shore power grid-connected cabinet, the PLC is further provided with a signal output port, and the touch screen is connected with the signal output port through an RS485 bus.
In the preferred embodiment of the utility model, a second high-voltage circuit breaker is connected between the second microcomputer protection device and the second current input end, the PLC is further provided with a third control port, a fourth control port is correspondingly arranged at the second high-voltage circuit breaker, the third control port is electrically connected with the fourth control port, the PLC is further provided with a third feedback port, a fourth feedback port is correspondingly arranged at the second high-voltage circuit breaker, and a second opening and closing state sensor is connected between the third feedback port and the fourth feedback port.
In a preferred embodiment of the utility model, the second high-voltage circuit breaker and the second current input end are provided with a first grounding branch connected with the ground wire, and a first grounding switch is arranged at the first grounding branch.
In a preferred embodiment of the utility model, the first high-voltage circuit breaker and the first current input end are provided with a second grounding branch connected with the ground wire, and the second grounding branch is provided with a second grounding switch.
The beneficial effects are that:
according to the high-voltage shore power grid-connected system provided by the embodiment of the utility model, through the cooperative control of the first microcomputer protection device and the second microcomputer protection device and the PLC, the automatic synchronous detection and accurate switching-on of the high-voltage shore power and the ship power are realized, grid-connected impact caused by manual operation errors is avoided, and the damage risk of ship load equipment is reduced.
Furthermore, the first high-voltage circuit breaker and the second high-voltage circuit breaker are respectively used for isolating shore power from the ship power side and are matched with the first grounding branch and the second grounding branch and the first grounding switch and the second grounding switch, so that the circuit is ensured to be forcedly grounded during maintenance, and electric shock or short-circuit accidents caused by residual charges are avoided.
In addition, the touch screen reads data from the PLC, and displays the voltage, frequency, phase and breaker state of the power grids at the two sides of the shore power and the ship power in real time, so that the user can conveniently monitor and operate in real time.
Drawings
FIG. 1 is a schematic diagram of a high voltage shore power grid-tie system connection in at least one embodiment of the present utility model;
FIG. 2 is a schematic diagram of a partial connection of a synchronization device in accordance with at least one embodiment of the present utility model.
Detailed Description
Referring to fig. 1-2, the present embodiment provides a high-voltage shore power grid-connected system, which includes a high-voltage shore power generator 1 and a shore power grid-connected cabinet 2, wherein the high-voltage shore power generator 1 is connected to a first current input end 21 of the shore power grid-connected cabinet 2 through a cable, and an output end of a ship generator 4 is connected to a second current input end 22 of the shore power grid-connected cabinet 2.
Wherein, rated power of the high-voltage shore power generator 1 and the ship generator 4 is 6600V.
In this embodiment, a first microcomputer protection device and a second microcomputer protection device are disposed in the shore power grid-connected cabinet 2, the first microcomputer protection device is used for collecting voltage/current signals of the first current input end 21 (through a PT/CT sensor) and transmitting data to the PLC through a Modbus-TCP protocol, the second microcomputer protection device is used for collecting voltage/current signals of the second current input end 22 (through the PT/CT sensor) and transmitting data to the PLC through a Modbus-TCP protocol, the first microcomputer protection device is connected in series between the first current input end 21 and the bus 3, and the second microcomputer protection device is connected in series between the second current input end 22 and the bus 3.
Specifically, the PLC has a first signal inlet 61 and a second signal inlet 62, the first signal inlet 61 and the second signal inlet 62 are electrically connected with a first microcomputer protection device and a second microcomputer protection device respectively,
It is understood that the first and second microcomputer protection devices are SYMAP-F-C1B4.
In addition, a first high voltage breaker 5 is connected in series between the first microcomputer protection device and the first current input end 21, the on-off state of the first high voltage breaker 5 is controlled by a PLC, specifically, the PLC has a first control port 63, a second control port 51 is correspondingly provided at the first high voltage breaker 5, and the first control port 63 is electrically connected with the second control port 51.
Correspondingly, the PLC is further provided with a first feedback port 64, a second feedback port 52 is correspondingly arranged at the position of the first high-voltage circuit breaker 5, and a first opening and closing state sensor is connected between the first feedback port 64 and the second feedback port 52, so that the PLC can acquire closing state information feedback of the first high-voltage circuit breaker 5.
In use, the PLC receives voltage, frequency and phase data of power grids at two sides, the synchronous condition is judged through a built-in algorithm, when delta U is less than or equal to 2%, delta f is less than or equal to 0.1Hz and the phase difference is less than or equal to 5 degrees, a closing signal is sent to a control loop of the first high-voltage circuit breaker 5 to perform closing, at the moment, the high-voltage shore power generator 1 and the ship power generator 4 realize grid-connected power generation, and power is supplied to a ship load through the bus 3.
In some embodiments, a second high voltage circuit breaker 7 is connected between the second microcomputer protection device and the second current input 22 for protecting the second microcomputer protection device from damage caused by high voltage.
Specifically, the PLC further has a third control port 66, a fourth control port 71 is correspondingly disposed at the second high voltage circuit breaker 7, the third control port 66 is electrically connected with the fourth control port 71, the PLC further has a third feedback port 67, a fourth feedback port 72 is correspondingly disposed at the second high voltage circuit breaker 7, and a second opening and closing state sensor is connected between the third feedback port 67 and the fourth feedback port 72.
In some embodiments, a touch screen is further arranged at the outer wall of the shore power grid-connected cabinet 2, the PLC is further provided with a signal output port 65, and the touch screen is connected with the signal output port 65 through an RS485 bus 3, so that the power grid parameters of the grid-connected generators on two sides and the states of the two circuit breakers can be displayed in real time.
In addition, in some embodiments, a grounding protection structure is further provided, which comprises a first grounding branch 8 arranged between the second current input end 22 and the second high-voltage circuit breaker 7, a first grounding switch 81 is arranged on the first grounding branch 8 and used for forced grounding when the ship generator 4 is overhauled, and a second grounding branch 9 arranged between the first current input end 21 and the first high-voltage circuit breaker 5, and a second grounding switch 91 is arranged on the second grounding branch 9 and used for safely discharging residual charges after the shore power system is powered off.
It is to be understood that, based on one or several embodiments provided in the present application, those skilled in the art may combine, split, reorganize, etc. the embodiments of the present application to obtain other embodiments, which do not exceed the protection scope of the present application.
Claims (8)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202520560793.6U CN223986958U (en) | 2025-03-28 | 2025-03-28 | High-voltage shore power grid-connected system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202520560793.6U CN223986958U (en) | 2025-03-28 | 2025-03-28 | High-voltage shore power grid-connected system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN223986958U true CN223986958U (en) | 2026-03-10 |
Family
ID=98972022
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202520560793.6U Active CN223986958U (en) | 2025-03-28 | 2025-03-28 | High-voltage shore power grid-connected system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN223986958U (en) |
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2025
- 2025-03-28 CN CN202520560793.6U patent/CN223986958U/en active Active
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