Electric Ship DC Charging Simulation Test Platform

Abstract

The present application provides a DC charging simulation test platform for electric ships, including: a DC charging power supply, the input end of which is electrically connected to the mains; a shore power connection box, the input end of which is electrically connected to the DC charging power supply, and the output end of which is electrically connected to the DC bus; a ship power module, which can be electrically connected to the DC bus through the a end of the double-throw switch S1 or the b end of the double-throw switch S2; a battery management system, which is connected to the ship power module in communication and is used to monitor the status of the ship's power battery pack; a daily load inverter, the input end of which is electrically connected to the DC bus, and the output end of which supplies power to the ship's daily load; a ship power management system, which is connected to the battery management system and the daily load inverter in communication and is used to monitor the working status of various equipment on the ship side. The present application solves the problem in the prior art that it is difficult to conduct simulation experiments on the DC charging process of electric ships, especially the problem of conducting simulation experiments on electric ships with multiple battery packs when charging through a DC bus.

Description

Technical Field

[0001] The present invention relates to the technical field of electric ship charging simulation, and in particular to an electric ship DC charging simulation test platform. Background Art

[0002] For pure electric vessels, the application of large-scale energy storage and replenishment in high-power vessels remains a significant challenge due to the low energy density and high cost of batteries. DC charging technology, commonly known as "fast charging," uses 380V AC power, rectified to generate adjustable DC power, which is then used to directly charge electric vessels. This technology offers high charging power and rapid charging speeds.

[0003] Currently, DC charging technology for electric ships is still in its infancy. There are two main mainstream technical solutions: direct grid-connected lithium battery charging, a common DC charging solution for electric vehicles, suitable for small ships with only one or two battery packs and low system power. The other is a DC bus system charging solution, suitable for large and medium-sized pure electric ships with a large number of battery packs. Currently, relevant standards and specifications for DC charging for electric ships have not yet been promulgated, making it difficult to determine a universal and comprehensive technical solution. Summary of the Invention

[0004] The purpose of the present invention is to overcome the above technical deficiencies and provide an electric ship DC charging simulation test platform to solve the problem in the prior art that it is difficult to conduct simulation experiments on DC charging of electric ships with different battery packs.

[0005] In order to achieve the above technical objectives, the technical solution of the present invention provides an electric ship DC charging simulation test platform, comprising:

[0006] DC charging power supply, the input end of which is connected to the mains;

[0007] A shore power connection box, the input end of which is electrically connected to the DC charging power supply through the b end of the double-throw switch S1, and the output end of which is electrically connected to the DC bus;

[0008] The ship power supply module can be optionally connected to the DC charging power supply through the a terminal of the double-throw switch S1, or electrically connected to the DC bus through the b terminal of the double-throw switch S2;

[0009] A battery management system, communicatively connected to the ship power module, the battery management system being used to monitor the status of the ship's power battery pack;

[0010] A daily load inverter, the input end of which is electrically connected to the DC bus, and the output end of which supplies power to the daily loads of the ship;

[0011] The ship power management system is in communication with the battery management system and the daily load inverter, and is used to monitor the working status of various equipment on the ship side and to assist in controlling the charging and discharging process.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] The electric ship DC charging simulation test platform provided by the present invention is compatible with different electric ship lithium battery charging system solutions and can fully simulate the DC charging characteristics of electric ships. The present invention can automatically identify the charging system structure of the target ship and switch the charging control strategy to charge the target ship; it can fully simulate the DC charging process of electric ships, including charging interface plug-in, charging connection confirmation, charging handshake and on-site / remote monitoring of the charging process; the present invention can control the energy scheduling of electric ships during charging through the host computer, and can enable the power battery pack to feed power to the grid when the grid load is high. The present invention can carry out a variety of electric ship DC charging related experiments, such as electric ship DC charging simulation experiments, charging safety protection experiments, charging communication control experiments, charging power scheduling experiments and DC grid / off-grid switching experiments.

[0014] According to some embodiments of the present invention, the electric ship DC charging simulation test platform further includes:

[0015] A DC charging control module is communicatively connected to the DC charging power supply, and the DC charging control module is used to control the charging and discharging process.

[0016] According to some embodiments of the present invention, the system further includes: a transformer, wherein the daily load inverter supplies power to the daily load of the ship after voltage transformation by the transformer.

[0017] According to some embodiments of the present invention, the further comprising:

[0018] a first DC / DC converter, an output end of which is electrically connected to the DC bus and is in communication with the ship power management system;

[0019] a second DC / DC converter, an output end of which is electrically connected to the DC bus and is in communication with the ship power management system;

[0020] The ship power module includes: a first power battery pack, which can be electrically connected to a DC charging power supply through a terminal a of a double-throw switch S1 and a terminal a of a double-throw switch S2, or electrically connected to a first DC / DC converter through a terminal b of the double-throw switch S2;

[0021] The second power battery pack can be electrically connected to the DC charging power supply through the a terminal of the double-throw switch S1 and the a terminal of the double-throw switch S3, or electrically connected to the second DC / DC converter through the b terminal of the double-throw switch S3.

[0022] According to some embodiments of the present invention, the battery management system includes:

[0023] a first BMS and a second BMS, wherein the first BMS is used to monitor the status of the first power battery pack, and the second BMS is used to monitor the status of the second power battery pack.

[0024] According to some embodiments of the present invention, the further comprising:

[0025] The host computer is connected to the DC charging control module via Ethernet.

[0026] According to some embodiments of the present invention, the ship power management system is communicatively connected to the first BMS, the second BMS, the first DC / DC converter, the second DC / DC converter and the daily load inverter through an independent CAN bus on the ship side.

[0027] According to some embodiments of the present invention, a switch S4 is provided between the daily load inverter and the transformer.

[0028] According to some embodiments of the present invention, the DC charging power supply is connected to the DC charging control module via a 485 bus.

[0029] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, wherein the abstract drawing is identical to one of the drawings in the specification:

[0031] Figure 1 A schematic diagram of a DC charging simulation test platform for electric ships provided in one embodiment of the present invention;

[0032] Figure 2 A schematic diagram of a DC charging simulation test platform for electric ships provided in another embodiment of the present invention.

[0033] Explanation of reference numerals: DC charging power supply 110 , shore power connection box 120 , ship power module 130 , battery management system 140 , daily load inverter 150 , ship power management system 160 . DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0035] It should be noted that although the system diagrams illustrate functional module divisions and the flowcharts illustrate logical sequences, in certain circumstances, the steps shown or described may be performed in a sequence that differs from the module divisions in the system or the sequence in the flowcharts. The terms "first," "second," and so on, in the specification, claims, and drawings, are used to distinguish similar items and are not necessarily used to describe a specific sequence or precedence.

[0036] This invention provides a DC charging simulation test platform for electric vessels. It is compatible with different lithium battery charging system solutions for electric vessels and can fully simulate the DC charging characteristics of electric vessels. The invention can automatically identify the charging system structure of the target vessel and switch the charging control strategy to charge the target vessel.

[0037] The embodiments of the present invention are further described below with reference to the accompanying drawings.

[0038] Reference Figure 1 , Figure 1 A schematic diagram of a DC charging simulation test platform for electric ships provided in one embodiment of the present invention.

[0039] In one embodiment, the electric ship DC charging simulation test platform includes: a DC charging power supply 110, whose input end is electrically connected to the mains; a shore power connection box 120, whose input end is electrically connected to the DC charging power supply 110 through the b end of the double-throw switch S1, and whose output end is electrically connected to the DC bus; a ship power supply module 130, which can be optionally connected to the DC charging power supply 110 through the a end of the double-throw switch S1, or electrically connected to the DC bus through the b end of the double-throw switch S2; a battery management system 140, which is communicatively connected to the ship power module 130, and the battery management system 140 is used to monitor the status of the ship's power battery pack; a daily load inverter 150, whose input end is electrically connected to the DC bus, and whose output end supplies power to the ship's daily load; a ship power management system 160, which is communicatively connected to the battery management system 140 and the daily load inverter 150, and is used to monitor the working status of various equipment on the ship side and to assist in controlling the charging and discharging process.

[0040] The electric ship DC charging simulation test platform provided in this embodiment is compatible with different electric ship lithium battery charging system solutions and can fully simulate the DC charging characteristics of electric ships. The present invention can automatically identify the charging system structure of the target ship and switch the charging control strategy to charge the target ship; it can fully simulate the DC charging process of electric ships, including charging interface plugging, charging connection confirmation, charging handshake and on-site / remote monitoring of the charging process. Through the present invention, a number of electric ship DC charging related experiments can be carried out, such as electric ship DC charging simulation experiments, charging safety protection experiments, charging communication control experiments, charging power scheduling experiments and ship power management experiments, etc., which has good practical value.

[0041] Reference Figure 2 , Figure 2 A schematic diagram of a DC charging simulation test platform for electric ships provided in another embodiment of the present invention.

[0042] In one embodiment, the electric ship DC charging simulation test platform includes: a DC charging power supply 110, the input end of which is electrically connected to the mains; a shore power connection box 120, the input end of which is electrically connected to the DC charging power supply 110 through the b end of the double-throw switch S1, and the output end of which is electrically connected to the DC bus; a ship power module 130, which can be optionally connected to the DC charging power supply 110 through the a end of the double-throw switch S1, or electrically connected to the DC bus through the b end of the double-throw switch S2; a battery management system 140, which is connected to the ship power module 130. 0 communication connection, the battery management system 140 is used to monitor the status of the ship's power battery pack; the daily load inverter 150 has its input end electrically connected to the DC bus and its output end supplies power to the ship's daily loads; the ship's power management system 160 is communicated with the battery management system 140 and the daily load inverter 150, and is used to monitor the operating status of various ship-side equipment and assist in controlling the charging and discharging process; the DC charging control module is communicated with the DC charging power supply 110, and the DC charging control module is used to control the charging and discharging process. The DC charging power supply 110 and the DC charging control module are connected via a 485 bus.

[0043] In one embodiment, the electric ship DC charging simulation test platform includes: a DC charging power supply 110, the input end of which is electrically connected to the mains; a shore power connection box 120, the input end of which is electrically connected to the DC charging power supply 110 through the b end of the double-throw switch S1, and the output end of which is electrically connected to the DC bus; a ship power module 130, which can be optionally connected to the DC charging power supply 110 through the a end of the double-throw switch S1, or electrically connected to the DC bus through the b end of the double-throw switch S2; a battery management system 140, which is in communication with the ship power module 130, and the battery management system 140 The following components are used to monitor the status of the ship's power battery packs: a daily load inverter 150, whose input is electrically connected to the DC bus and whose output supplies power to the ship's daily loads; a ship's power management system 160, which is in communication with the battery management system 140 and the daily load inverter 150 and is used to monitor the operating status of various shipboard devices and assist in controlling the charging and discharging process; a DC charging control module, which is in communication with the DC charging power supply 110 and is used to control the charging and discharging process; and a transformer, which transforms the voltage of the daily load inverter 150 and supplies power to the ship's daily loads. A switch S4 is provided between the daily load inverter 150 and the transformer.

[0044] In one embodiment, the electric ship DC charging simulation test platform includes: a DC charging power supply 110, the input end of which is electrically connected to the mains; a shore power connection box 120, the input end of which is electrically connected to the DC charging power supply 110 through the b end of the double-throw switch S1, and the output end of which is electrically connected to the DC bus; a ship power supply module 130, which can be optionally connected to the DC charging power supply 110 through the a end of the double-throw switch S1, or electrically connected to the DC bus through the b end of the double-throw switch S2; a battery management system 140, which is communicatively connected to the ship power supply module 130, and the battery management system 140 is used to monitor the status of the ship power battery pack; a daily load inverter 150, the input end of which is electrically connected to the DC bus, and the output end of which supplies power to the ship's daily load; a ship power management system 160, which is communicated with the battery management system 140 and the daily load The inverter 150 is communicatively connected and used to monitor the working status of various equipment on the ship side and to assist in controlling the charging and discharging process; the first DC / DC converter, the output end of which is electrically connected to the DC bus and is communicatively connected to the ship power management system; the second DC / DC converter, the output end of which is electrically connected to the DC bus and is communicatively connected to the ship power management system; the ship power module 130 includes: a first power battery pack, which can be optionally electrically connected to the DC charging power supply 110 through the a end of the double-throw switch S1 and the a end of the double-throw switch S2, or electrically connected to the first DC / DC converter through the b end of the double-throw switch S2; the second power battery pack, which can be optionally electrically connected to the DC charging power supply 110 through the a end of the double-throw switch S1 and the a end of the double-throw switch S3, or electrically connected to the second DC / DC converter through the b end of the double-throw switch S3.

[0045] In one embodiment, the electric ship DC charging simulation test platform includes: a DC charging power supply 110, the input end of which is electrically connected to the mains; a shore power connection box 120, the input end of which is electrically connected to the DC charging power supply 110 through the b end of the double-throw switch S1, and the output end of which is electrically connected to the DC bus; a ship power module 130, which can be optionally connected to the DC charging power supply 110 through the a end of the double-throw switch S1, or electrically connected to the DC bus through the b end of the double-throw switch S2; a battery management system 140, which is connected to the ship power module 1 30 communication connection, the battery management system 140 is used to monitor the status of the ship's power battery pack; the daily load inverter 150, the input end is electrically connected to the DC bus, and the output end supplies power to the ship's daily load; the ship's power management system 160, is communicatively connected to the battery management system 140 and the daily load inverter 150, and is used to monitor the working status of various equipment on the ship side and to assist in controlling the charging and discharging process; the first DC / DC converter, the output end is electrically connected to the DC bus; the second DC / DC converter, the output end is electrically connected to the DC bus.

[0046] The ship power module 130 includes: a first power battery pack, which can be electrically connected to the DC charging power supply 110 via terminal a of a double-throw switch S1 and terminal a of a double-throw switch S2, or electrically connected to the first DC / DC converter via terminal b of the double-throw switch S2; a second power battery pack, which can be electrically connected to the DC charging power supply 110 via terminal a of a double-throw switch S1 and terminal a of a double-throw switch S3, or electrically connected to the second DC / DC converter via terminal b of the double-throw switch S3. The battery management system 140 includes: a first BMS and a second BMS, the first BMS being used to monitor the status of the first power battery pack, and the second BMS being used to monitor the status of the second power battery pack.

[0047] The ship power management system 160 is communicatively connected to the first BMS, the second BMS, the first DC / DC converter, the second DC / DC converter and the daily load inverter 150 via an independent CAN bus on the ship side.

[0048] In one embodiment, the electric ship DC charging simulation test platform includes: a DC charging power supply 110, the input end of which is electrically connected to the mains; a shore power connection box 120, the input end of which is electrically connected to the DC charging power supply 110 through the b end of the double-throw switch S1, and the output end of which is electrically connected to the DC bus; a ship power supply module 130, which can be optionally connected to the DC charging power supply 110 through the a end of the double-throw switch S1, or electrically connected to the DC bus through the b end of the double-throw switch S2; a battery management system 140, which is in communication with the ship power supply module 130, and the battery management system The system 140 is used to monitor the status of the ship's power battery pack; the daily load inverter 150 has an input end electrically connected to the DC bus and an output end that supplies power to the ship's daily load; the ship's power management system 160 is communicated with the battery management system 140 and the daily load inverter 150, and is used to monitor the working status of various equipment on the ship side and to assist in controlling the charging and discharging process; a DC charging control module is communicated with the DC charging power supply 110, and the DC charging control module is used to control the charging and discharging process; the host computer is communicated with the DC charging control module via Ethernet.

[0049] The rated power of the above-mentioned DC charging power supply can be 100kW; both groups of power batteries are marine lithium iron phosphate batteries, with a capacity of 315Ah per group, a total capacity of 630Ah, and a total voltage of 384V; the DC bus voltage is DC600V; the rated power of the two DC / DC converters is 40kW; the rated power of the daily load inverter is 45kW; the mains power is 380V three-phase AC power.

[0050] When S1 and S2 are both closed to contact a and S3 is closed to contact b, the lithium battery charging system adopts a direct grid-connected charging scheme, simulating a small electric boat with only one set of power batteries. When charging, the onboard converter and load are not considered. S4 is disconnected, the second power battery pack is shut down, and the first power battery pack is directly connected to the DC charging power supply for charging. The DC charging power supply communicates with BMS1 in real time via the DC charging control module and the ship's power management system, outputting adjustable DC power to charge the first power battery pack in real time according to demand.

[0051] When S1 is closed to contact a, and S2 and S3 are alternately closed to contact b, the lithium battery charging system adopts a direct grid-connected charging scheme. This simulates a medium-sized electric ship with two sets of power batteries. When charging, the daily loads on board this type of electric ship must operate normally. When S4 is closed, at any time, one set of power batteries is directly connected to the DC charging power supply for charging, while the other set of power batteries is discharged through the corresponding DC / DC converter to maintain DC bus voltage stability and power balance. The DC charging power supply communicates in real time with the battery management system of the power battery pack in the charging state via the DC charging control module and the ship's power management system, outputting adjustable DC power to charge the power battery pack in real time according to demand.

[0052] When S1, S2, and S3 are all closed to contact b, the lithium battery charging system adopts a DC bus charging scheme, simulating a medium-sized electric vessel with two power battery banks. During charging, the onboard loads must operate normally. With S4 closed, both power battery banks are charging. The DC charging power source connects to the DC bus through the shore power connection box and connects to the ship's DC grid, maintaining DC bus voltage stability and power balance. DC / DC converters 1 and 2 communicate in real time with the battery management system of each power battery bank, outputting adjustable DC power to charge the corresponding battery bank according to demand. The ship's energy management system (EMS) allocates charging power in real time, actively controlling the charging power of the corresponding power battery bank via DC / DC converters 1 and 2. The EMS also coordinates the operating modes of DC / DC converters 1 and 2 and the charging power source at the start and end of charging, ensuring orderly power transfer of power to the power banks. In addition, the DC charging control module can also issue power dispatch instructions to make both groups of ship power batteries work in a discharge state. After the ship's surplus power is reverse-inverted through the DC charging power supply, it is connected to the mains grid to achieve "peak shaving and valley filling" of the mains power grid.

[0053] Regardless of the working mode, the DC charging control module and EMS are jointly responsible for charging process control and charging safety protection.

[0054] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, i.e., they may be located in one place or distributed across multiple network units. Some or all of the modules may be selected based on actual needs to achieve the objectives of this embodiment.

[0055] Those skilled in the art will appreciate that all or some of the steps and systems disclosed above can be implemented as software, firmware, hardware, or any suitable combination thereof. Some or all of the physical components may be implemented as software executed by a processor, such as a central processing unit, digital signal processor, or microprocessor, or as hardware, or as an integrated circuit, such as an application-specific integrated circuit. Such software may be distributed on computer-readable media, which may include computer storage media (or non-transitory media) and communication media (or transient media). As is well known to those skilled in the art, the term computer storage media includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information, such as computer-readable instructions, data structures, program modules, or other data. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technologies, CD-ROM, digital versatile disks (DVDs) or other optical disk storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to store the desired information and can be accessed by a computer. Furthermore, as is well known to those skilled in the art, communication media typically embodies computer-readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave or other transport mechanism, and may include any information delivery media.

[0056] The above is a specific description of the preferred implementation of the present invention, but the present invention is not limited to the above implementation. Those skilled in the art can make various equivalent modifications or substitutions without violating the spirit of the present invention. These equivalent modifications or substitutions are all included in the scope defined by the claims of the present invention.

[0057] The specific embodiments of the present invention described above do not limit the scope of protection of the present invention. Any other corresponding changes and modifications made based on the technical concept of the present invention should be included in the scope of protection of the claims of the present invention.

Claims

1. A DC charging simulation test platform for electric ships, characterized in that: include: DC charging power supply, the input end of which is connected to the mains; A shore power connection box, the input end of which is electrically connected to the DC charging power supply through the b end of the double-throw switch S1, and the output end of which is electrically connected to the DC bus; The ship power module can be optionally connected to the DC charging power supply through the a terminal of the double-throw switch S1, or electrically connected to the DC bus through the b terminal of the double-throw switch S2; when S1 and S2 are both closed to contact a, the ship power module is directly grid-connected for charging; when S1 and S2 are both closed to contact b, the ship power module is charged for the DC bus system; A battery management system, communicatively connected to the ship power module, the battery management system being used to monitor the status of the ship's power battery pack; A daily load inverter, the input end of which is electrically connected to the DC bus, and the output end of which supplies power to the daily loads of the ship; The ship power management system is in communication with the battery management system and the daily load inverter, and is used to monitor the working status of various equipment on the ship side and assist in controlling the charging and discharging process.

2. The electric ship DC charging simulation test platform according to claim 1 is characterized in that: Also includes: A DC charging control module is communicatively connected to the DC charging power supply, and the DC charging control module is used to control the charging and discharging process.

3. The electric ship DC charging simulation test platform according to claim 1 or 2, characterized in that: Also includes: The daily load inverter supplies power to the daily load of the ship after voltage transformation by the transformer.

4. The electric ship DC charging simulation test platform according to claim 1 is characterized in that: Also includes: a first DC / DC converter, an output end of which is electrically connected to the DC bus and is in communication with the ship power management system; a second DC / DC converter, an output end of which is electrically connected to the DC bus and is in communication with the ship power management system; The ship power module includes: a first power battery pack, which can be electrically connected to a DC charging power supply through a terminal a of a double-throw switch S1 and a terminal a of a double-throw switch S2, or electrically connected to a first DC / DC converter through a terminal b of the double-throw switch S2; The second power battery pack can be electrically connected to the DC charging power supply through the a terminal of the double-throw switch S1 and the a terminal of the double-throw switch S3, or electrically connected to the second DC / DC converter through the b terminal of the double-throw switch S3.

5. The electric ship DC charging simulation test platform according to claim 4 is characterized in that: The battery management system includes: a first BMS and a second BMS, wherein the first BMS is used to monitor the status of the first power battery pack, and the second BMS is used to monitor the status of the second power battery pack.

6. The electric ship DC charging simulation test platform according to claim 2, characterized in that: Also includes: The host computer is connected to the DC charging control module via Ethernet.

7. The electric ship DC charging simulation test platform according to claim 5, characterized in that: The ship power management system is communicatively connected with the first BMS, the second BMS, the first DC / DC converter, the second DC / DC converter and the daily load inverter via an independent CAN bus on the ship side.

8. The electric ship DC charging simulation test platform according to claim 3 is characterized in that: A switch S4 is provided between the daily load inverter and the transformer.

9. The electric ship DC charging simulation test platform according to claim 2, characterized in that: The DC charging power supply is connected to the DC charging control module via a 485 bus.

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