Marine pure battery power direct-current electric propulsion system

Abstract

The utility model belongs to the technical field of ship power, and particularly discloses a marine pure battery power direct-current electric propulsion system which comprises two sets of direct-current busbars, a set of high-voltage charging system, a set of low-voltage charging system, eight sets of battery systems and two sets of load systems. By arranging the battery system, the high-voltage charging system, the low-voltage charging system and the like, pure electric operation of ship power can be achieved, the economical efficiency of ship operation is improved, and pollutant emission is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of ship power, and particularly relates to a marine pure battery-powered DC electric propulsion system. Background Art

[0002] In recent years, energy conservation and emission reduction of ships have become an important concern in the ship industry. With the development of economic globalization and scientific and technological innovation, and the increasingly strict environmental protection regulations, the research on energy conservation and emission reduction technologies in the ship industry is urgent. Among them, new energy sources such as fuel cells, battery energy storage, wind energy, and solar energy, which are different from traditional fossil fuels, have been widely used on land, providing a reference for the application of new energy in the ship industry. Content of the Utility Model

[0003] The purpose of the utility model is to solve the technical problems existing in the background art. Therefore, a marine pure battery-powered DC electric propulsion system is provided.

[0004] In order to achieve the above purpose, the technical solutions adopted by the utility model are as follows:

[0005] A marine pure battery-powered DC electric propulsion system includes at least one set of DC busbars, and the DC busbars are electrically connected to at least one set of high-voltage charging systems, at least one set of low-voltage charging systems, N sets of battery systems, and multiple sets of load systems, where N≥4;

[0006] The battery system includes a battery pack, a DC converter, a first protection resistor, and a battery switch. The battery pack is electrically connected to the DC converter, the DC converter is electrically connected to the first protection resistor, the first protection resistor is electrically connected to the battery switch, and the battery switch is electrically connected to the DC busbars.

[0007] The following is a further limited technical solution of the utility model. There are two sets of DC busbars, and the two sets of DC busbars are electrically connected through a bus tie solid-state switch.

[0008] The following is a further limited technical solution of the utility model. The high-voltage charging system includes a high-voltage cable winch, a high-voltage connection distribution board, a high-voltage transformer, two primary high-voltage charging switches, two filters, two shore power rectifiers, and two secondary high-voltage charging switches;

[0009] The high-voltage cable winch is electrically connected to the high-voltage connection distribution board, the high-voltage connection distribution board is electrically connected to the input end of the high-voltage transformer, the high-voltage transformer has two output ends, and the two output ends are respectively electrically connected to a set of DC busbars through the primary high-voltage charging switches, filters, shore power rectifiers, and secondary high-voltage charging switches.

[0010] The following are the further defined technical solutions of the present utility model. The output end of the high-voltage transformer is electrically connected to the primary high-voltage charging switch. The primary high-voltage charging switch is electrically connected to the filter. The filter is electrically connected to the shore power rectifier. The shore power rectifier is electrically connected to the secondary high-voltage charging switch. The secondary high-voltage charging switch is electrically connected to the DC busbar.

[0011] The following are the further defined technical solutions of the present utility model. The low-voltage charging system includes a low-voltage shore power box, a 400V distribution board, two daily-use transformers, two daily-use inverters, and two low-voltage protection resistors.

[0012] The two halves of the 400V distribution board are electrically connected through a switch.

[0013] The low-voltage shore power box is electrically connected to the 400V distribution board. The two halves of the 400V distribution board are respectively electrically connected to a group of DC busbars through the daily-use transformers, daily-use inverters, and low-voltage protection resistors.

[0014] The following are the further defined technical solutions of the present utility model. One half of the 400V distribution board is electrically connected to the daily-use transformer. The daily-use transformer is electrically connected to the daily-use inverter. The daily-use inverter is electrically connected to the low-voltage protection resistor. The low-voltage protection resistor is electrically connected to the DC busbar.

[0015] The following are the further defined technical solutions of the present utility model. The load system includes a main propulsion motor and a main propulsion inverter.

[0016] The main propulsion motor is electrically connected to the main propulsion inverter. The main propulsion inverter is electrically connected to the DC busbar.

[0017] A fully rotating rudder propeller is installed at the output end of the main propulsion motor.

[0018] The following are the further defined technical solutions of the present utility model. The load system further includes a 230V distribution board and two low-voltage transformers.

[0019] The two halves of the 230V distribution board are electrically connected through a switch.

[0020] A low-voltage transformer is electrically connected between one half of the 400V distribution board and one half of the 230V distribution board.

[0021] Another low-voltage transformer is electrically connected between the other half of the 400V distribution board and the other half of the 230V distribution board.

[0022] Compared with the prior art, the present utility model has the following technical effects:

[0023] The utility model can realize the pure electric operation of the ship power by setting a battery system, a high-voltage charging system, a low-voltage charging system, etc., improve the economy of ship operation and reduce pollutant emissions.

[0024] The following further describes the utility model in conjunction with the accompanying drawings and embodiments. Description of the Drawings

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following briefly introduces the drawings required to be used in the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0026] Figure 1 It is a system connection diagram of the present utility model. Detailed Embodiments

[0027] To make the above objects, features, and advantages of the present utility model more obvious and understandable, the following detailed description of the specific embodiments of the present utility model is made in conjunction with the accompanying drawings. Many specific details are set forth in the following description to fully understand the present utility model. However, the present utility model can be implemented in many other ways different from those described herein. Those skilled in the art can make similar improvements without departing from the connotation of the present utility model. Therefore, the present utility model is not limited by the specific embodiments disclosed below.

[0028] In the description of the present utility model, "a plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0029] As Figure 1 shown, a marine pure battery-powered DC electric propulsion system is provided, which mainly consists of two sets of DC busbars, a set of high-voltage charging systems, a set of low-voltage charging systems, eight sets of battery systems, two sets of load systems, etc.

[0030] The two sets of DC busbars are electrically connected through a bus tie solid-state switch. There is a 1000V DC power supply on the DC busbars.

[0031] The battery system includes a battery pack (preferably a lithium battery pack of 838.656 kWh), a DC converter (also known as a DC / DC converter of 600 kW), a first protection resistor, and a battery switch. The battery pack and the DC converter are electrically connected, the DC converter and the first protection resistor are electrically connected, the first protection resistor and the battery switch are electrically connected, and the battery switch and the DC busbar are electrically connected. In this embodiment, eight sets of lithium battery packs are used for power supply.

[0032] The high-voltage charging system includes a high-voltage cable winch, a high-voltage connection distribution board, a high-voltage transformer (also known as the shore power transformer AC6000V / 690V 1000kVA), two primary high-voltage charging switches, two filters, two shore power rectifiers (also known as AC / DC rectifiers 900kW), and two secondary high-voltage charging switches. The high-voltage cable winch is electrically connected to the high-voltage connection distribution board, the high-voltage connection distribution board is electrically connected to the input end of the high-voltage transformer. The high-voltage transformer has two output ends, and the two output ends are respectively electrically connected to a set of DC busbars through the primary high-voltage charging switches, filters, shore power rectifiers, and secondary high-voltage charging switches.

[0033] The low-voltage charging system includes a low-voltage shore power box, a 400V distribution board, two daily-use transformers (250kVA), two daily-use inverters (200kW), and two low-voltage protection resistors. The two halves of the 400V distribution board are electrically connected through a switch; the low-voltage shore power box is electrically connected to the 400V distribution board, and the two halves of the 400V distribution board are respectively electrically connected to a set of DC busbars through the daily-use transformers, daily-use inverters, and low-voltage protection resistors.

[0034] The load system includes a main propulsion motor (2000kW 3AC690V 0-1000rpm) and a main propulsion inverter (2100kW). There are two sets of load systems, so there are two sets of main propulsion motors and two sets of main propulsion inverters. Further, since the daily loads need electricity, a 220V - 260V daily-use AC voltage needs to be provided. Therefore, there is a 230V distribution board and two low-voltage transformers (AC400V / 230V 30kVA).

[0035] The main propulsion motor is electrically connected to the main propulsion inverter, and the main propulsion inverter is electrically connected to the DC busbars. The full-rotation rudder propeller is driven by 2 main propulsion motors. The main propulsion motors and the full-rotation rudder propeller are mechanically connected through couplings to form an L-shaped transmission mechanism. The main propulsion motor uses a permanent magnet synchronous water-cooled motor, which has the characteristics of high efficiency, compact volume, and light weight. The propulsion motor is driven by AC electrical energy output from the inverter.

[0036] The two halves of the 230V distribution board are electrically connected through a switch; one half of the 400V distribution board is electrically connected to one half of the 230V distribution board through a low-voltage transformer; the other half of the 400V distribution board is electrically connected to the other half of the 230V distribution board through another low-voltage transformer.

[0037] The battery system is connected to the DC busbars through a DCDC converter. The battery system is quickly charged through the shore-side high-voltage shore power, or can be slowly charged through the low-voltage shore power box (also known as the low-voltage AC shore power box). The DC / AC inverter provides AC power for the main propulsion motor and daily loads.

[0038] The working process of this embodiment will be further described below:

[0039] During berthing, the 6kV power supply is led to the ship through the high-voltage cable winch of the high-voltage charging system for charging. Alternatively, the 6kV power supply can be led to the ship from other high-voltage shore power boxes at berths in the port for charging. After the high-voltage AC shore power supply is stepped down by a transformer, it is connected to the DC busbar through an AC / DC rectifier to provide DC1000V power for the DC busbar. Then, the lithium battery pack of the battery system is charged through a DC / DC converter, ensuring that the lithium battery SOC is charged from 10% to over 95%. At the same time, a set of 200kW low-voltage shore power box is configured, and the battery system can be slowly charged with AC400V power provided by the shore-based power supply.

[0040] After the battery system is fully charged, the lithium battery pack of the battery system provides DC1000V power for the DC busbar through a DC / DC converter, and then the inverter outputs AC electric energy to drive the main propulsion motor and daily loads.

[0041] The above are only the preferred embodiments of the present invention, and do not impose any formal restrictions on the present invention. Any person skilled in the art can make many possible changes and modifications to the technical solution of the present invention, or modify it into an equivalent embodiment with equivalent changes, without departing from the scope of the technical solution of the present invention. Therefore, all equivalent changes made according to the shape, structure, and principle of the present invention without departing from the content of the technical solution of the present invention shall be covered by the protection scope of the present invention.

Claims

1. A marine pure battery-powered DC electric propulsion system, characterized in that, It includes at least one set of DC busbars, and the DC busbars are electrically connected to at least one set of high-voltage charging systems, at least one set of low-voltage charging systems, N sets of battery systems, and multiple sets of load systems, where N≥4; The battery system includes a battery pack, a DC converter, a first protection resistor, and a battery switch. The battery pack is electrically connected to the DC converter, the DC converter is electrically connected to the first protection resistor, the first protection resistor is electrically connected to the battery switch, and the battery switch is electrically connected to the DC busbars.

2. The marine pure battery-powered DC electric propulsion system according to claim 1, wherein, There are two sets of DC busbars, and the two sets of DC busbars are electrically connected through a bus tie solid-state switch.

3. A marine pure battery-powered DC electric propulsion system according to claim 2, characterized in that, The high-voltage charging system includes a high-voltage cable winch, a high-voltage connection distribution board, a high-voltage transformer, two primary high-voltage charging switches, two filters, two shore power rectifiers, and two secondary high-voltage charging switches; The high-voltage cable winch is electrically connected to the high-voltage connection distribution board, the high-voltage connection distribution board is electrically connected to the input end of the high-voltage transformer, the high-voltage transformer has two output ends, and the two output ends are respectively electrically connected to a set of DC busbars through the primary high-voltage charging switches, filters, shore power rectifiers, and secondary high-voltage charging switches.

4. The marine pure battery-powered DC electric propulsion system according to claim 3, characterized in that, The output end of the high-voltage transformer is electrically connected to the primary high-voltage charging switch, the primary high-voltage charging switch is electrically connected to the filter, the filter is electrically connected to the shore power rectifier, the shore power rectifier is electrically connected to the secondary high-voltage charging switch, and the secondary high-voltage charging switch is electrically connected to the DC busbars.

5. The marine pure battery-powered DC electric propulsion system according to claim 2, wherein, The low-voltage charging system includes a low-voltage shore power box, a 400V distribution board, two daily use transformers, two daily use inverters, and two low-voltage protection resistors; The two halves of the 400V distribution board are electrically connected through a switch; The low-voltage shore power box is electrically connected to the 400V distribution board, and the two halves of the 400V distribution board are respectively electrically connected to a set of DC busbars through the daily use transformers, daily use inverters, and low-voltage protection resistors.

6. The marine pure battery-powered DC electric propulsion system according to claim 5, characterized in that, One half of the 400V distribution board is electrically connected to the daily use transformer, the daily use transformer is electrically connected to the daily use inverter, the daily use inverter is electrically connected to the low-voltage protection resistor, and the low-voltage protection resistor is electrically connected to the DC busbars.

7. The marine pure battery-powered DC electric propulsion system according to claim 2, wherein The load system includes a main propulsion motor and a main propulsion inverter; The main propulsion motor is electrically connected to the main propulsion inverter, and the main propulsion inverter is electrically connected to the DC busbars; A full-rotation steering propeller is installed at the output end of the main propulsion motor.

8. A marine pure battery-powered DC electric propulsion system according to claim 5, characterized in that, The load system also includes a 230V distribution board and two low-voltage transformers; The two halves of the 230V distribution board are electrically connected through a switch; A low-voltage transformer is electrically connected between one half of the 400V distribution board and one half of the 230V distribution board; Another low-voltage transformer is electrically connected between the other half of the 400V distribution board and the other half of the 230V distribution board.

Images