A method and system for supplying power to ship shore power
By setting up AC380V and AC220V shore power connectors on the ship and achieving independent power supply through interlock switches, the problem of inland ships being unable to access shore power when docking in remote townships is solved, reducing exhaust gas emissions and operating costs, and improving power safety.
Patent Information
- Application Number
- CN202411730030.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-29
- Publication Date
- 2025-04-04
AI Technical Summary
When inland ships dock in remote townships, there may be no 380V shore power supply, and only 220V shore power supply, which makes the ship unable to access shore power. They must rely on the on-board generator to generate power, which increases fuel consumption, exhaust gas emissions and operating costs.
Design a marine shore power supply system, including AC380V and AC220V shore power connectors, main distribution board and conversion switch, and realize independent power supply of each power supply system to avoid voltage mixing.
It has achieved that ships can be powered by shore power when docking at any terminal, reducing exhaust gas emissions and operating costs, and improving the safety of electricity use.
Smart Images
Figure CN119765271A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of shipbuilding, and more specifically, to a power supply method and system for ship shore power. Background Art
[0002] In the traditional ship shore power supply system, in order to connect to shore power when moored or repaired, the ship is generally equipped with a 380V shore power box, which supplies power to the 380V and 220V loads on the ship after being processed by the ship's main distribution board and transformer. However, when inland ships dock at non-professional docks in remote towns, there may be no 380V shore power, only 220V shore power, resulting in the ship being unable to connect to shore power when moored and having to rely on the ship's generator to generate electricity. However, when the ship's generator works, the ship's internal combustion engine needs to be started, which not only wastes fuel, increases exhaust emissions, but also increases operating costs. Summary of the invention
[0003] The technical problem to be solved by the present invention is to provide a power supply method and system for ship shore power in view of the deficiencies in the prior art, thereby reducing exhaust gas emissions and lowering ship operating costs.
[0004] A ship shore power supply system described in the present invention comprises an AC380V shore power connector, an AC220V shore power connector, a main distribution board and a conversion switch; the main distribution board is provided with a ship generator set system output end; the AC380V shore power connector is connected to the ship generator set system output end as an AC380V load power supply end; a first interlocking switch is provided on the line between the AC380V shore power connector and the AC380V load power supply end and between the ship generator set system output end and the AC380V load power supply end, the AC380V load power supply end is connected to the load input line through the conversion switch, the AC220V shore power connector is connected to the input end of the conversion switch, and a second interlocking switch is provided between the AC220V shore power connector, the AC380V shore power connector and the ship generator set system output end.
[0005] Preferably, the first interlock switch includes a first contactor, the coil of the first contactor is connected to the AC380V shore power connector, the normally open contact of the first contactor is arranged between the AC380V shore power connector and the AC380V load power supply end, and the normally closed contact of the first contactor is arranged between the output end of the marine generator set system and the AC380V load power supply end.
[0006] Preferably, the second interlock switch includes a second contactor, the coil of the second contactor is connected to the AC220V shore power connector, the second contactor is provided with a first normally closed contact and a second normally closed contact, the first normally closed contact is arranged between the AC380V shore power connector and the AC380V load power supply end, and the second normally closed contact is arranged between the output end of the marine generator set system and the AC380V load power supply end.
[0007] Preferably, a fuse is provided on the connection line between the coil of the second contactor and the AC220V shore power connector.
[0008] Preferably, an indicator light is provided between the two ends of the coil of the second contactor.
[0009] Preferably, the conversion switch is provided with a four-way switch, the AC380V load power supply end is provided with an A1 phase line, a B1 phase line and a C1 phase line, the C1 phase line is provided with a C2 phase line connected thereto, and the A1 phase line, B1 phase line, C1 phase line and C2 phase line correspond one-to-one to each switch of the four-way switch respectively.
[0010] Preferably, the AC220V shore power connector is provided with an L-phase line and an N-phase line connected thereto, the L-phase line is provided with an L1-phase line connected thereto, the N-phase line is provided with an N1-phase line connected thereto, and the N-phase line, L-phase line, N1-phase line and L1-phase line correspond one-to-one to each switch of the four-way switch respectively.
[0011] A method for a power supply system based on the ship shore power, wherein a shore power connector that can be connected to AC380V shore power and AC220V shore power is simultaneously provided on the ship, and two interlocking switches are provided between the two shore power connectors and the output end of the ship generator set system, so that at the same time, the load input line can only be powered by the AC380V shore power, AC220V shore power or the output end of the ship generator set system.
[0012] Beneficial Effects
[0013] The advantages of the present invention are: installing AC380V shore power connector and AC220V shore power connector on the ship at the same time, and realizing independent power supply of each power supply system to the load through two interlocking switches, without affecting each other, avoiding the problem of power accidents caused by mixing different voltages due to misoperation, and improving the safety of power use. The ship can be powered by shore power when docked at any dock, reducing exhaust emissions and reducing ship operating costs. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 It is a schematic diagram of the framework structure of the power supply system of the present invention;
[0015] Figure 2 It is a schematic diagram of the circuit structure of the power supply system of the present invention. DETAILED DESCRIPTION
[0016] The present invention will be further described below in conjunction with the embodiments, but it does not constitute any limitation to the present invention. Any limited number of modifications made by anyone within the scope of the claims of the present invention are still within the scope of the claims of the present invention.
[0017] See also Figure 1-Figure 2 , a ship shore power supply system of the present invention includes an AC380V shore power connector SCB, an AC220V shore power connector LSCB, a main distribution board UA1 and a conversion switch QE. That is, on the basis of the traditional single AC380V shore power connector SCB, an AC220V shore power connector LSCB is added, so that the ship shore power supply system can be adapted to AC380V shore power and AC220V shore power, solving the technical pain points in the prior art. Specifically, a ship generator set system output terminal UA3 is provided on the main distribution board UA1. The AC380V shore power connector SCB is connected to the ship generator set system output terminal UA3 as an AC380V load power supply terminal, and the AC380V load power supply terminal is provided with an A1 phase line, a B1 phase line and a C1 phase line. A first interlocking switch is provided on the line between the AC380V shore power connector SCB and the AC380V load power supply end, and between the output end UA3 of the marine generator system and the AC380V load power supply end, so that only the AC380V shore power or the marine generator system can supply power to the load on board at the same time. The AC380V load power supply end is connected to the load input line through the conversion switch QE, so that the power supply system and the load on board can be directly turned on and off. The AC220V shore power connector LSCB is connected to the input end of the conversion switch QE, and a second interlocking switch is provided between the AC220V shore power connector LSCB and the AC380V shore power connector SCB and the output end UA3 of the marine generator system, so that only the AC380V shore power or the AC220V shore power can supply power to the load on board or the marine generator system at a time. Such a design can realize the independent power supply of each power supply system to the load without affecting each other, avoid the problem of power accidents caused by the mixing of different voltages due to misoperation, and improve the safety of power use.
[0018] The first interlock switch includes a first contactor, the coil KM0 of the first contactor is connected to the AC380V shore power connector SCB, the normally open contact KM1 of the first contactor is set between the AC380V shore power connector SCB and the AC380V load power supply terminal, and the normally closed contact KM2 of the first contactor is set between the output terminal UA3 of the marine generator set system and the AC380V load power supply terminal. When there is no AC380V shore power, the first contactor does not operate, at which time the output terminal UA3 of the marine generator set system and the AC380V load power supply terminal are connected, and the load is powered by the output terminal UA3 of the marine generator set system. When the ship is connected to the AC380V shore power device, the first contactor operates, at which time the output terminal UA3 of the marine generator set system and the AC380V load power supply terminal are disconnected, and the AC380V shore power connector SCB and the AC380V load power supply terminal are connected, so that the load on the ship is powered by the AC380V shore power.
[0019] The second interlock switch includes a second contactor, the coil K2 of the second contactor is connected to the AC220V shore power connector LSCB, the second contactor is provided with a first normally closed contact KH1 and a second normally closed contact KH2, the first normally closed contact is arranged between the AC380V shore power connector SCB and the AC380V load power supply terminal, and the second normally closed contact KH2 is arranged between the output terminal UA3 of the marine generator system and the AC380V load power supply terminal. When the power is supplied by the AC220V shore power, the second contactor is actuated, and its two normally closed contacts are disconnected, so that the AC380V cannot be connected to the load line, thereby improving safety. When there is no AC220V shore power supply, the two normally closed contacts of the second contactor are closed, and at this time, the power can be supplied by any AC380V power supply.
[0020] In order to improve the safety of the circuit, a fuse FU is provided on the connection line between the coil K2 of the second contactor and the AC220V shore power connector LSCB of the present embodiment. In addition, an indicator LED is provided between the two ends of the coil K2 of the second contactor, and the supply voltage type of the shore power at this time can be intuitively seen through the indicator LED.
[0021] In order to meet the diversity of power supply to the load and maintain the power supply balance of each line, the conversion switch QE of this embodiment is provided with four switches, namely a1 terminal, b1 terminal, c1 terminal and d1 terminal. The C1 phase line is provided with a C2 phase line connected thereto, and the A1 phase line, the B1 phase line, the C1 phase line and the C2 phase line correspond to each switch of the four-way switch one by one. In addition, the AC220V shore power connector LSCB is provided with an L phase line and an N phase line connected thereto, the L phase line is provided with an L1 phase line connected thereto, and the N phase line is provided with an N1 phase line connected thereto, and the N phase line, the L phase line, the N1 phase line and the L1 phase line correspond to each switch of the four-way switch one by one.
[0022] A method for a power supply system based on the above-mentioned ship shore power, a shore power connector that can be connected to AC380V shore power and AC220V shore power is set on the ship at the same time, and two interlocking switches are set between the two shore power connectors and the output end (UA3) of the ship generator system, so that at the same time, the load input line can only be powered by the AC380V shore power, AC220V shore power or the output end (UA3) of the ship generator system. In this way, the connection and use of AC380V shore power and AC220V shore power can be realized, and the scope of application is increased. And through two interlocking switches, each power supply system can independently power the load without affecting each other, avoiding the problem of power accidents caused by mixing different voltages due to misoperation, and improving the safety of power use. When the ship is docked at any dock, it can be powered by shore power, reducing exhaust gas emissions and reducing ship operating costs.
[0023] The above is only a preferred embodiment of the present invention. It should be pointed out that for those skilled in the art, several modifications and improvements can be made without departing from the structure of the present invention, which will not affect the effect of the implementation of the present invention and the practicality of the patent.
Claims
1. A power supply system for ship shore power, characterized in that: The invention comprises an AC380V shore power connector (SCB), an AC220V shore power connector (LSCB), a main distribution board (UA1) and a conversion switch (QE); the main distribution board (UA1) is provided with a marine generator set system output end (UA3); the AC380V shore power connector (SCB) is connected to the marine generator set system output end (UA3) as an AC380V load power supply end; the AC380V shore power connector (SCB) is connected to the AC380V load power supply end and the marine generator set system output end (UA3) as an AC380V load power supply end; A first interlocking switch is provided on the line between the output end (UA3) of the generator system and the AC380V load power supply end, the AC380V load power supply end is connected to the load input line through the conversion switch (QE), the AC220V shore power connector (LSCB) is connected to the input end of the conversion switch (QE), and a second interlocking switch is provided between the AC220V shore power connector (LSCB) and the AC380V shore power connector (SCB) and the output end (UA3) of the marine generator system.
2. A ship shore power supply system according to claim 1, characterized in that: The first interlock switch includes a first contactor, a coil (KM0) of the first contactor is connected to the AC380V shore power connector (SCB), a normally open contact (KM1) of the first contactor is arranged between the AC380V shore power connector (SCB) and the AC380V load power supply end, and a normally closed contact (KM2) of the first contactor is arranged between the output end (UA3) of the marine generator set system and the AC380V load power supply end.
3. A ship shore power supply system according to claim 2, characterized in that: The second interlock switch includes a second contactor, the coil (K2) of the second contactor is connected to the AC220V shore power connector (LSCB), the second contactor is provided with a first normally closed contact (KH1) and a second normally closed contact (KH2), the first normally closed contact is arranged between the AC380V shore power connector (SCB) and the AC380V load power supply end, and the second normally closed contact (KH2) is arranged between the output end (UA3) of the marine generator set system and the AC380V load power supply end.
4. A ship shore power supply system according to claim 3, characterized in that: A fuse (FU) is provided on the connection line between the coil (K2) of the second contactor and the AC220V shore power connector (LSCB).
5. A ship shore power supply system according to claim 3, characterized in that: An indicator light (LED) is provided between the two ends of the coil (K2) of the second contactor.
6. A ship shore power supply system according to claim 1, characterized in that: The conversion switch (QE) is provided with a four-way switch, the AC380V load power supply end is provided with an A1 phase line, a B1 phase line and a C1 phase line, the C1 phase line is provided with a C2 phase line connected thereto, and the A1 phase line, B1 phase line, C1 phase line and C2 phase line correspond one by one to each switch of the four-way switch respectively.
7. A ship shore power supply system according to claim 1, characterized in that: The AC220V shore power connector (LSCB) is provided with an L-phase line and an N-phase line connected thereto, the L-phase line is provided with an L1-phase line connected thereto, the N-phase line is provided with an N1-phase line connected thereto, and the N-phase line, L-phase line, N1-phase line and L1-phase line correspond one-to-one to each switch of the four-way switch respectively.
8. A method for powering a ship shore power system according to any one of claims 1 to 7, characterized in that: Shore power connectors that can be connected to AC380V shore power and AC220V shore power are provided on the ship, and two interlocking switches are provided between the two shore power connectors and the output end (UA3) of the marine generator set system, so that at the same time, the load input line can only be powered by the AC380V shore power, AC220V shore power or the output end (UA3) of the marine generator set system.