High-voltage shore power grid-connected system

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, 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, and the bus is connected with a ship load. A first microcomputer protection device, a second microcomputer protection device and a grid-connected synchronizing device are arranged in the shore power grid-connected cabinet, and automatic synchronizing detection and accurate switching-on of high-voltage shore power and ship power are achieved through cooperative control of the first microcomputer protection device, the second microcomputer protection device and the PLC.

Description

TECHNICAL FIELD

[0001] The utility model relates to ship shore power technology field, concretely relates to a high pressure shore power grid connected system. BACKGROUND

[0002] The ship shore power technology mainly refers to using the power on the shore for the ship that stops in the port provides electric energy, replaces a part of the diesel generator set of the ship itself, thereby effectively reduces the ship emission, noise and vibration, has the important significance to the environmental protection.

[0003] With the continuous promotion of the ship scale and power demand, the traditional low voltage shore power system (such as 440V) is difficult to meet the electric energy supply demand of large capacity ship, especially in the case that the high voltage main distribution board (usually 6600V) of large container ship cannot be directly connected to the shore power system, the low voltage shore power system is limited to the limit current value of circuit breaker, and it is difficult to realize high power supply. UTILITY MODEL CONTENTS

[0004] The utility model provides a kind of high pressure shore power grid connected system, it can overcome certain or some defects of prior art.

[0005] According to the high pressure shore power grid connected system of the utility model, it includes high pressure shore power generator and shore power grid connected cabinet, shore power grid connected cabinet has first current input, second current input and bus, first current input and high pressure shore power generator are electrically connected, second current input and ship generator are electrically connected, bus is connected with ship load, first microcomputer protection device, second microcomputer protection device and grid connected synchronizing device are equipped in shore power grid connected cabinet, first microcomputer protection device and second microcomputer protection device are electrically connected with bus, first microcomputer protection device is electrically connected with first current input, first microcomputer protection device and first current input are connected with first high voltage circuit breaker, and grid connected synchronizing device is electrically connected with first microcomputer protection device, second microcomputer protection device and first high voltage circuit breaker respectively.

[0006] In the preferred embodiment of the utility model, grid connected synchronizing device includes PLC, PLC has first signal inlet and second signal inlet, first signal inlet and second signal inlet are electrically connected with first microcomputer protection device and second microcomputer protection device respectively, and Modbus-TCP communication protocol is used.

[0007] In the preferred embodiment of the utility model, PLC also has first control port, and second control port is correspondingly equipped at first high voltage circuit breaker, and first control port and second control port are electrically connected.

[0008] In the preferred embodiment of the utility model, the PLC further has 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.

[0009] In the preferred embodiment of the utility model, a touch screen is further arranged at the outer wall of the shore power grid connection cabinet, the PLC further has a signal output port, and the touch screen and the signal output port are connected through an RS485 bus.

[0010] 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 further has a third control port, a fourth control port is correspondingly arranged at the second high-voltage circuit breaker, the third control port and the fourth control port are electrically connected, the PLC further has 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.

[0011] In the 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 a ground wire, and a first grounding switch is arranged at the first grounding branch.

[0012] In the 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 a ground wire, and a second grounding switch is arranged at the second grounding branch.

[0013] Beneficial effects:

[0014] The high-voltage shore power grid connection system provided in the embodiment of the utility model realizes automatic simultaneous detection and accurate closing of high-voltage shore power and ship power through the cooperative control of the first and second microcomputer protection devices and the PLC, avoids grid connection impact caused by manual operation errors, and reduces the risk of damage of ship load equipment.

[0015] Further, the first and second high-voltage circuit breakers respectively isolate the shore power side and the ship power side, cooperate with the first and second grounding branches and the first and second grounding switches, ensure forced grounding of the circuit during maintenance, and prevent electric shock or short circuit accidents caused by residual charge.

[0016] In addition, the touch screen reads data from the PLC, and displays the voltage, frequency, phase and circuit breaker state of the power grids on the shore power side and the ship power side in real time, thereby facilitating real-time monitoring and operation of the user. BRIEF DESCRIPTION OF DRAWINGS

[0017] Fig. 1 It is a connection schematic diagram of the high-voltage shore power grid connection system in at least one embodiment of the utility model;

[0018] Fig. 2 It is a connection schematic diagram of the grid simultaneous device part in at least one embodiment of the utility model. DETAILED DESCRIPTION

[0019] Seen in Figs. 1-2 The embodiment provides a high-voltage shore power grid-connected system, which comprises a high-voltage shore power generator 1 and a shore power grid-connected cabinet 2, 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 power generator 4 is connected to a second current input end 22 of the shore power grid-connected cabinet 2.

[0020] The rated power of the high-voltage shore power generator 1 and the ship power generator 4 is 6600V.

[0021] In the embodiment, the shore power grid-connected cabinet 2 is provided with a first microcomputer protection device and a second microcomputer protection device, the first microcomputer protection device is used for collecting voltage / current signals (through PT / CT sensors) of the first current input end 21 and transmitting data to a PLC through a Modbus-TCP protocol, the second microcomputer protection device is used for collecting voltage / current signals (through PT / CT sensors) of the second current input end 22 and transmitting data to the PLC through the 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.

[0022] Specifically, the PLC has a first signal access port 61 and a second signal access port 62, the first signal access port 61 and the second signal access port 62 are electrically connected with the first microcomputer protection device and the second microcomputer protection device respectively,

[0023] It can be understood that the first microcomputer protection device and the second microcomputer protection device are SYMAP-F-C1B4.

[0024] In addition, a first high-voltage circuit 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 circuit breaker 5 is controlled by the PLC, specifically, the PLC has a first control port 63, a second control port 51 is correspondingly arranged at the first high-voltage circuit breaker 5, and the first control port 63 is electrically connected with the second control port 51.

[0025] Correspondingly, the PLC also has a first feedback port 64, a second feedback port 52 is correspondingly arranged at the first high-voltage circuit breaker 5, and a first opening-closing state sensor is connected between the first feedback port 64 and the second feedback port 52, so that the PLC can obtain the closing state information feedback of the first high-voltage circuit breaker 5.

[0026] In use, the PLC receives voltage, frequency, phase data of the two sides of the power grid, judges the synchronization condition through the built-in algorithm, and when the conditions of ΔU≤2%, Δf≤0.1 Hz, and phase difference≤5° are met, sends a closing signal to the control circuit of the first high-voltage circuit breaker 5 to close, at which time the high-voltage shore power generator 1 and the ship power generator 4 realize grid-connected power generation and provide power to the ship load through the bus 3.

[0027] In some embodiments, a second high-voltage circuit breaker 7 is connected between the second microcomputer protection device and the second current input end 22, which is used to protect the second microcomputer protection device from damage caused by high voltage.

[0028] Specifically, the PLC also has a third control port 66, and the second high-voltage circuit breaker 7 is correspondingly provided with a fourth control port 71, the third control port 66 and the fourth control port 71 are electrically connected, the PLC also has a third feedback port 67, and the second high-voltage circuit breaker 7 is correspondingly provided with a fourth feedback port 72, and a second closing and opening state sensor is connected between the third feedback port 67 and the fourth feedback port 72.

[0029] In some embodiments, a touch screen is also provided on the outer wall of the shore power grid-connected cabinet 2, and the PLC also has a signal output port 65, and the touch screen and the signal output port 65 are connected through an RS485 bus 3, which can display the grid parameters of the two sides of the grid-connected generator and the state of the two circuit breakers in real time.

[0030] In addition, in some embodiments, a grounding protection structure is also provided, which includes a first grounding branch 8 arranged between the second current input end 22 and the second high-voltage circuit breaker 7, and a first grounding switch 81 is installed on the first grounding branch 8, which is used for forced grounding when the ship power generator 4 side 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 installed on the second grounding branch 9, which is used for safe discharge of residual charge after the shore power system is powered off.

[0031] It is easy to understand that those skilled in the art can combine, split, recombine, etc. the embodiments of the present application on the basis of one or more embodiments provided in the present application to obtain other embodiments, and these embodiments do not exceed the protection scope of the present application.

Claims

1. A high-voltage shore power grid-connection system, characterized in that The high-voltage shore power generator and the shore power grid-connected cabinet are connected electrically, the shore power grid-connected cabinet has a first current input end, a second current input end and a bus, the first current input end is connected electrically with the high-voltage shore power generator, the second current input end is connected electrically with the ship power generator, the bus is connected with the ship load, the shore power grid-connected cabinet is provided with a first microcomputer protection device, a second microcomputer protection device and a grid-connected synchronization device, the first microcomputer protection device and the second microcomputer protection device are connected electrically with the bus, the first microcomputer protection device is connected electrically with the first current input end, and the first microcomputer protection device and the first current input end are connected with a first high-voltage circuit breaker, and the grid-connected synchronization device is connected electrically with the first microcomputer protection device, the second microcomputer protection device and the first high-voltage circuit breaker.

2. The high-voltage shore power grid-connected system of claim 1, wherein, The grid-connected synchronization device comprises a PLC, the PLC has a first signal inlet and a second signal inlet, and the first signal inlet and the second signal inlet are connected electrically with the first microcomputer protection device and the second microcomputer protection device respectively.

3. The high-voltage shore power grid-connected system of claim 2, wherein, The PLC further has a first control port, and the first high-voltage circuit breaker is provided with a second control port correspondingly, and the first control port is connected electrically with the second control port.

4. The high-voltage shore power grid-connected system of claim 2, wherein, The PLC further has a first feedback port, and the first high-voltage circuit breaker is provided with a second feedback port correspondingly, and the first feedback port and the second feedback port are connected with a first opening and closing state sensor.

5. The high-voltage shore power grid-connected system of claim 2, wherein, The shore power grid-connected cabinet is further provided with a touch screen at the outer wall, and the PLC further has a signal output port, and the touch screen is connected with the signal output port through an RS485 bus.

6. The high-voltage shore power grid-tie system of claim 1, wherein, The second microcomputer protection device and the second current input end are connected with a second high-voltage circuit breaker, the PLC further has a third control port, the second high-voltage circuit breaker is provided with a fourth control port correspondingly, the third control port is connected electrically with the fourth control port, the PLC further has a third feedback port, the second high-voltage circuit breaker is provided with a fourth feedback port correspondingly, and the third feedback port and the fourth feedback port are connected with a second opening and closing state sensor.

7. The high-voltage shore power grid-connected system of claim 6, wherein, The second high-voltage circuit breaker and the second current input end are provided with a first grounding branch connected with a ground wire, and the first grounding branch is provided with a first grounding switch.

8. The high-voltage shore power grid-tie system of claim 1, wherein, The first high-voltage circuit breaker and the first current input end are provided with a second grounding branch connected with a ground wire, and the second grounding branch is provided with a second grounding switch.

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