CN210985662U - Direct current micro-grid suitable for ocean engineering ship - Google Patents

Direct current micro-grid suitable for ocean engineering ship Download PDF

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Publication number
CN210985662U
CN210985662U CN201921981720.5U CN201921981720U CN210985662U CN 210985662 U CN210985662 U CN 210985662U CN 201921981720 U CN201921981720 U CN 201921981720U CN 210985662 U CN210985662 U CN 210985662U
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redundant
redundant power
converter
electrically connected
power distribution
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翁康强
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Fujian Fuchuan Ocean Engineering Technology Research Institute Co ltd
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Fujian Fuchuan Ocean Engineering Technology Research Institute Co ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J5/00—Circuit arrangements for transfer of electric power between ac networks and dc networks
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J1/00—Circuit arrangements for dc mains or dc distribution networks
    • H02J1/10—Parallel operation of dc sources
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
    • H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
    • H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
    • H02J9/061—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for DC powered loads
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B2241/00—Design characteristics
    • B63B2241/20—Designs or arrangements for particular purposes not otherwise provided for in this class
    • B63B2241/22—Designs or arrangements for particular purposes not otherwise provided for in this class for providing redundancy to equipment or functionality of a vessel, e.g. for steering
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2310/00—The network for supplying or distributing electric power characterised by its spatial reach or by the load
    • H02J2310/40—The network being an on-board power network, i.e. within a vehicle
    • H02J2310/42—The network being an on-board power network, i.e. within a vehicle for ships or vessels

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Abstract

The utility model relates to the technical field of ocean engineering ships, in particular to a direct current micro-grid suitable for ocean engineering ships, which is characterized in that a redundant power supply system is electrically connected with a direct current bus through a redundant power distribution system, and the direct current bus connects a direct current network to an external alternating current power grid through a redundant variable frequency control system, so that loads of some small-sized equipment, living facility loads and the like can be changed into voltage levels required by each load to be connected to distribution boards of each area; and the integration level of the whole system is greatly improved, the volume, the weight and the construction amount are greatly reduced, and the construction cost of a shipyard is saved.

Description

Direct current micro-grid suitable for ocean engineering ship
Technical Field
The utility model relates to an ocean engineering ship technical field, in particular to little electric wire netting of direct current suitable for ocean engineering ship.
Background
With the development of power electronic technology, an electric propulsion system has been widely applied to ocean engineering ships and becomes the mainstream configuration of high-end ocean engineering ships, and whether the ocean engineering ships have good economy is the most important index of the ocean engineering ships due to the fact that the ocean engineering ships have more operation equipment and complex operation conditions. Meanwhile, with the continuous improvement of energy-saving and environment-friendly requirements and the continuous development of green clean energy, how to apply new energy and energy-saving and environment-friendly technology to the electric propulsion ocean engineering ship becomes the research direction of the current maritime engineering ship market with the improved energy-saving and environment-friendly performance and economy.
SUMMERY OF THE UTILITY MODEL
In order to overcome the defects of the prior art, the utility model aims to solve the technical problems that: the direct current micro-grid is suitable for ocean engineering ships.
In order to solve the technical problem, the utility model discloses a technical scheme be:
a direct-current micro-grid suitable for an ocean engineering ship comprises a first redundant power supply system, a second redundant power supply system, a first redundant power distribution system, a second redundant power distribution system, a first redundant variable-frequency control system, a second redundant variable-frequency control system and a direct-current bus;
the input end of the direct current bus is respectively electrically connected with the first redundant power distribution system and the second redundant power distribution system, the output end of the direct current bus is respectively electrically connected with the first redundant frequency conversion control system and the second redundant frequency conversion control system, the first redundant power supply system is electrically connected with the first redundant power distribution system, and the second redundant power supply system is electrically connected with the second redundant power distribution system.
Further, the first redundant power distribution system and the second redundant power distribution system have the same structure, and the first redundant power supply system and the second redundant power supply system have the same structure.
Further, the first redundant power supply system comprises a solar photovoltaic system, an energy storage device, a fuel cell, a first generator and a second generator, and the first redundant power distribution system comprises a first DC/DC converter, a second DC/DC converter, a third DC/DC converter, a first rectifier and a second rectifier;
the first DC/DC converter is electrically connected with the solar photovoltaic system, the second DC/DC converter is electrically connected with the energy storage device, the third DC/DC converter is electrically connected with the fuel cell, the first rectifier is electrically connected with the first generator, and the second rectifier is electrically connected with the second generator.
Further, the first redundant variable frequency control system and the second redundant variable frequency control system have the same structure.
Furthermore, the first redundant frequency conversion control system comprises a first inverter, a third inverter, a first frequency converter and a second frequency converter, wherein the first inverter is connected with the distribution electroplate, the third frequency converter is connected with a marine engineering motor, and the first frequency converter and the second frequency converter are respectively and correspondingly connected with a propulsion motor.
The beneficial effects of the utility model reside in that:
by electrically connecting the redundant power supply system with the direct-current bus through the redundant power distribution system, and connecting the direct-current bus to the external alternating-current power grid through the redundant variable-frequency control system, loads of some small-sized equipment, loads of living facilities and the like can be changed into voltage levels required by all loads to be connected to the distribution boards of all areas; the integration level of the whole system is greatly improved, the volume, the weight and the construction amount are greatly reduced, and the construction cost of a shipyard is saved; through setting up first redundant variable frequency control system and the redundant variable frequency control system of second, a large amount of feedback electric energy that produce in braking process directly feed back in direct current electric wire netting through the rectification, need not extra braking resistance box and come the consumption, played energy-conserving effect, need not extra cooling water system simultaneously, saved design, construction and volume input, reduced the shipyard cost and reduced empty ship weight simultaneously.
Drawings
Fig. 1 is a system block diagram of a dc microgrid suitable for a marine engineering vessel according to the present invention;
fig. 2 is a schematic structural diagram of a dc microgrid suitable for an ocean engineering vessel according to the present invention;
fig. 3 is a schematic structural diagram of a dc microgrid suitable for an ocean engineering vessel according to the present invention;
description of reference numerals:
1. a first redundant power supply system; 101. a solar photovoltaic system; 102. an energy storage device; 103. a fuel cell; 104. a first generator; 105. a second generator;
2. a second redundant power supply system;
3. a first redundant power distribution system; 301. a first DC/DC converter; 302. a second DC/DC converter; 303. a third DC/DC converter; 304. a first rectifier; 305. a second rectifier;
4. a second redundant power distribution system;
5. a first redundant variable frequency control system; 501. a first inverter; 502. a third frequency converter; 503. a first frequency converter; 504. a second frequency converter;
6. a second redundant variable frequency control system;
7. and a direct current bus.
Detailed Description
In order to explain the technical content, the objects and the effects of the present invention in detail, the following description is made with reference to the accompanying drawings in combination with the embodiments.
Referring to fig. 1, the technical solution provided by the present invention is:
a direct-current micro-grid suitable for an ocean engineering ship comprises a first redundant power supply system, a second redundant power supply system, a first redundant power distribution system, a second redundant power distribution system, a first redundant variable-frequency control system, a second redundant variable-frequency control system and a direct-current bus;
the input end of the direct current bus is respectively electrically connected with the first redundant power distribution system and the second redundant power distribution system, the output end of the direct current bus is respectively electrically connected with the first redundant frequency conversion control system and the second redundant frequency conversion control system, the first redundant power supply system is electrically connected with the first redundant power distribution system, and the second redundant power supply system is electrically connected with the second redundant power distribution system.
From the above description, the beneficial effects of the present invention are:
by electrically connecting the redundant power supply system with the direct-current bus through the redundant power distribution system, and connecting the direct-current bus to the external alternating-current power grid through the redundant variable-frequency control system, the loads of some small-sized equipment, the loads of living facilities and the like can be changed into voltage levels required by all loads to be connected to the distribution circuit boards of all areas; the integration level of the whole system is greatly improved, the volume, the weight and the construction amount are greatly reduced, and the construction cost of a shipyard is saved; through setting up first redundant variable frequency control system and the redundant variable frequency control system of second, a large amount of feedback electric energy that produce in braking process directly feed back in direct current electric wire netting through the rectification, need not extra braking resistance box and come the consumption, played energy-conserving effect, need not extra cooling water system simultaneously, saved design, construction and volume input, reduced the shipyard cost and reduced empty ship weight simultaneously.
Further, the first redundant power distribution system and the second redundant power distribution system have the same structure, and the first redundant power supply system and the second redundant power supply system have the same structure.
Further, the first redundant power supply system comprises a solar photovoltaic system, an energy storage device, a fuel cell, a first generator and a second generator, and the first redundant power distribution system comprises a first DC/DC converter, a second DC/DC converter, a third DC/DC converter, a first rectifier and a second rectifier;
the first DC/DC converter is electrically connected with the solar photovoltaic system, the second DC/DC converter is electrically connected with the energy storage device, the third DC/DC converter is electrically connected with the fuel cell, the first rectifier is electrically connected with the first generator, and the second rectifier is electrically connected with the second generator.
From the above description, it can be seen that by electrically connecting the first rectifier and the second rectifier to the dc bus and then connecting the first inverter to the dc bus, the dc power can be converted to the ac power for supplying power to the load through the distribution board, because the inverter is an integrated sine wave filter, the waveform quality of the output voltage is cleaner than the power generated by the conventional ac generator, the introduced harmonic is not disturbed and is not affected by the harmonic of the generator set, because the harmonic is isolated by the dc bus, compared with the ac networking system, no extra filter needs to be configured outside the system, the output waveform quality is better, the power quality is provided, and unnecessary loss is reduced.
Further, the first redundant variable frequency control system and the second redundant variable frequency control system have the same structure.
Furthermore, the first redundant frequency conversion control system comprises a first inverter, a third inverter, a first frequency converter and a second frequency converter, wherein the first inverter is connected with the distribution electroplate, the third frequency converter is connected with a marine engineering motor, and the first frequency converter and the second frequency converter are respectively and correspondingly connected with a propulsion motor.
Referring to fig. 1 to fig. 3, a first embodiment of the present invention is:
referring to fig. 1, a dc microgrid suitable for an ocean engineering vessel includes a first redundant power supply system 1, a second redundant power supply system 2, a first redundant power distribution system 3, a second redundant power distribution system 4, a first redundant frequency conversion control system 5, a second redundant frequency conversion control system 6, and a dc bus 7;
the input end of the direct current bus 7 is respectively electrically connected with the first redundant power distribution system 3 and the second redundant power distribution system 4, the output end of the direct current bus 7 is respectively electrically connected with the first redundant frequency conversion control system 5 and the second redundant frequency conversion control system 6, the first redundant power supply system 1 is electrically connected with the first redundant power distribution system 3, and the second redundant power supply system 2 is electrically connected with the second redundant power distribution system 4.
Referring to fig. 2 and 3, the first redundant power distribution system 3 and the second redundant power distribution system 4 have the same structure, and the first redundant power supply system 1 and the second redundant power supply system 2 have the same structure.
The first redundant power supply system 1 comprises a solar photovoltaic system 101, an energy storage device 102, a fuel cell 103, a first generator 104 and a second generator 105, and the first redundant power distribution system 3 comprises a first DC/DC converter 301, a second DC/DC converter 302, a third DC/DC converter 303, a first rectifier 304 and a second rectifier 305;
the first DC/DC converter 301 is electrically connected to the solar photovoltaic system 101, the second DC/DC converter 302 is electrically connected to the energy storage device 102, the third DC/DC converter 303 is electrically connected to the fuel cell 103, the first rectifier 304 is electrically connected to the first generator 104, and the second rectifier 305 is electrically connected to the second generator 105.
The first redundant variable frequency control system 5 and the second redundant variable frequency control system 6 have the same structure.
The first redundant frequency conversion control system 5 comprises a first inverter 501, a third frequency converter 502, a first frequency converter 503 and a second frequency converter 504, wherein the first inverter 501 is connected with a distribution board, the third frequency converter 502 is connected with a marine power motor, and the first frequency converter 503 and the second frequency converter 504 are respectively and correspondingly connected with a propulsion motor.
At present, a power grid multi-base AC networking design scheme applied to an electric propulsion ocean engineering ship is characterized in that a power station in an AC networking technology outputs a constant-speed AC generator set to form a marine AC 50/60Hz power grid with fixed frequency through an AC distribution board in parallel, a daily load of the ship directly gets electricity through the AC distribution board, a propulsion load changes the fixed 50/60Hz frequency into variable frequency in a certain range through an AC-DC-AC frequency converter to drive a propulsion motor and a propeller (an AC-DC part is called a rectifier, a DC-AC part is called an inverter, the frequency converter is in an Active Front End form, namely Active Front End-AFE or pulse rectification form, a phase-shifting transformer is required to be independently configured to meet harmonic control requirements, and when the input voltage of the frequency converter is inconsistent with the voltage of the power grid, a special propulsion load transformer (for example, the AC grid power system is AC380V or AC 440V) And when the conventional input voltage of the frequency converter is AC690V, the propulsion load transformer also needs to be used as a phase-shifting transformer when the frequency converter in the form of pulse rectification is adopted). All the generator sets are directly connected in parallel, a newly connected generator set can be switched on and switched off under the condition that the frequency, the phase and the voltage amplitude of the newly connected generator set are the same as those of the original power station, the grid connection of the generator sets is realized, and active power distribution is realized by adjusting the accelerator of the diesel engine set after the grid connection. Other engineering operation equipment and auxiliary equipment used on the ocean engineering ship, such as large deck machinery, are generally directly powered by an alternating current distribution board to a control box. The sectional type alternating current networking design scheme of the power positioning electric propulsion ocean engineering ship with more than 2 levels commonly used at present has the following defects:
1) on an electric propulsion ocean engineering ship with higher safety requirement and power positioning more than 2 levels, the adjustment requirement on the frequency, the phase and the voltage amplitude of an access diesel generating set is high, for the grid-connected diesel generating set, when the load fluctuates, the frequency and the voltage of the whole power station fluctuate, and under the condition that the power station with more than 2 levels of power positioning adopts closed busbar operation, the control of one diesel generating set collapses, so that the fault of the whole power station can be caused theoretically.
2) The energy-saving performance of large-scale deck operation equipment is poor, the feedback electric energy generated by a driving motor of the large-scale deck operation equipment such as a marine crane and multi-point anchoring equipment in the operation process such as braking operation can impact the power grid and cannot be incorporated into the power grid for use, the conventional method is that the generated feedback electric energy is consumed through a resistance box, the power of the feedback electric energy of the marine crane can reach 200 and 300kW, extra cooling water needs to be configured for cooling in a shipyard to be generated by the resistance box, the capacity of a cooling water pump is increased, the design, construction and quantity investment of the cooling water pipeline is increased, and the weight of an empty ship is increased.
3) The transformer is large in use and large in occupied area, the weight of an empty ship is increased, a plurality of sets of cooling systems are required to be configured for the ship adopting the water-cooled transformer according to a redundant design concept, and the design, construction and amount investment of cooling water pipelines are increased.
4) Because the propulsion system adopts an AC-DC-AC frequency converter, certain harmonic waves can be generated in the power grid, additional loss caused by heating of a grid motor in the power grid can be caused, harmonic suppression is difficult, THD (total harmonic distortion) can only meet the minimum standard requirement under normal conditions, the electric energy quality of the whole power station is difficult to improve, an additional filter is required to be added outside the system to improve the electric energy quality, the ship construction investment is increased, and the design and construction difficulty is increased.
5) The energy-saving and environment-friendly characteristics under specific working conditions are not high, and the compatibility of new energy technologies such as energy storage technology is poor.
6) The ship meeting the requirements of Tier3 on nitrogen oxide emission of the International maritime organization needs to be provided with a selective catalytic reduction reaction device (SCR device), and the working efficiency is low under the low-load working condition.
The direct current microgrid of this scheme design compares in traditional alternating current electric wire netting, has following advantage:
1) the whole system adopts a direct-current power grid, the generator set is still an alternating-current generator set, and alternating-current voltage is converted into direct-current voltage direct-current power station through the rectifier, so that the whole system has the advantages that the output voltage and frequency of the generator set are not sensitive, meanwhile, the whole power distribution and transfer are also completed through the rectifier, and the throttle of the diesel generator set is not required to be adjusted; direct grid connection between diesel generator sets does not exist, grid connection is achieved through control of a rectifier connected with the generator sets, even two generator sets with large rated power difference can achieve rapid and stable grid connection operation and load distribution, and flexibility of system design is provided.
2) The variable-speed generator set is selected, the generator set can work at different rotating speeds, variable-speed operation can be realized according to different load conditions, and the generator set can always operate at the most economic point of rotating speed, torque output and fuel consumption through a rotating speed-load-fuel consumption curve of the generator, so that the operating efficiency of the diesel generator set is improved, the working efficiency of an SCR system is improved, energy consumption and emission are reduced, the maintenance cost of the generator set is reduced, and the service life of the diesel generator set is prolonged.
3) Large deck operation equipment such as a marine crane and multi-point anchoring equipment are uniformly controlled by a frequency conversion control unit integrated by a redundant power distribution system, so that the arrangement space of the original large starter is saved; by adopting the bidirectional redundant variable frequency control system, a large amount of feedback electric energy generated in the braking process is directly fed back to a direct current power grid through rectification, the consumption of an extra braking resistance box is not needed, the energy-saving effect is achieved, an extra cooling water system is not needed, the design, construction and amount investment are saved, the shipyard cost is reduced, and the empty ship weight is reduced.
4) Because the transformer and part of the distribution board are saved, the direct current micro-grid system is directly connected with the generator and the motor, the integral system integration level is greatly improved, the volume, the weight and the construction amount are greatly reduced, and the construction cost of a shipyard is saved.
5) The variable speed generator set does not directly supply power to the marine load, but converts the direct current bus into the alternating current power supply to supply power to the load through the inverter, and because the inverter is an integrated sine wave filter, the waveform quality of output voltage is cleaner than the power supply generated by the traditional alternating current generator, the introduced harmonic wave does not disturb less, and the harmonic wave of the generator set cannot be influenced because the harmonic wave is isolated by the direct current bus. Compared with an alternating current networking system, the alternating current networking system does not need to be provided with an additional filter outside the system, the output waveform quality is better, the electric energy quality is improved, and unnecessary loss is reduced.
6) Because the direct current system is adopted by the direct current micro-grid system, the system compatibility is higher, energy storage equipment, new energy technology and the like can be connected to the direct current bus only through a DC/DC chopper integrated in the direct current bus redundancy frequency conversion control system, and the interface and the control are very simple and convenient. These devices require a more complex and costly design to access the traditional ac networking system.
7) The lithium battery energy storage system based on hot standby is integrated, and can be quickly put into a power grid for use. By utilizing the online lithium battery energy storage system, the lithium battery is charged when the generator set runs at low load so as to improve the load rate of the generator set, thereby improving the fuel combustion efficiency, reducing the carbon deposition of the diesel engine and the emission of harmful gas, and reducing the maintenance cost of the ship; when the generator runs under high load, the power grid is fed back to meet the use requirement under the high-power working condition, and the peak value compensation effect is achieved; under a specific working condition, such as in a port with emission control, the generator set can be replaced for use, and the effects of energy conservation and emission reduction are achieved; under the condition of installing the marine crane, feedback electric energy generated by braking of the marine crane is stored in the storage battery pack through rectification, and the marine crane has a good energy-saving effect.
To sum up, the utility model provides a direct current microgrid suitable for ocean engineering ship, through with redundant electrical power generating system through redundant distribution system with the direct current generating line electricity be connected, the direct current generating line is through redundant variable frequency control system with direct current network connection to outside alternating current electric wire netting, can make the load of some small-size equipment and life facility load etc. become the voltage class that each load needs like this, in order to be connected to the distribution electroplax in each region; the integration level of the whole system is greatly improved, the volume, the weight and the construction amount are greatly reduced, and the construction cost of a shipyard is saved; through setting up first redundant variable frequency control system and the redundant variable frequency control system of second, a large amount of feedback electric energy that produce in braking process directly feed back in direct current electric wire netting through the rectification, need not extra braking resistance box and come the consumption, played energy-conserving effect, need not extra cooling water system simultaneously, saved design, construction and volume input, reduced the shipyard cost and reduced empty ship weight simultaneously.
The above mentioned is only the embodiment of the present invention, and not the limitation of the patent scope of the present invention, all the equivalent transformations made by the contents of the specification and the drawings, or the direct or indirect application in the related technical field, are included in the patent protection scope of the present invention.

Claims (5)

1. A direct-current micro-grid suitable for an ocean engineering ship is characterized by comprising a first redundant power supply system, a second redundant power supply system, a first redundant power distribution system, a second redundant power distribution system, a first redundant variable-frequency control system, a second redundant variable-frequency control system and a direct-current bus;
the input end of the direct current bus is respectively electrically connected with the first redundant power distribution system and the second redundant power distribution system, the output end of the direct current bus is respectively electrically connected with the first redundant frequency conversion control system and the second redundant frequency conversion control system, the first redundant power supply system is electrically connected with the first redundant power distribution system, and the second redundant power supply system is electrically connected with the second redundant power distribution system.
2. The direct-current microgrid suitable for an ocean engineering ship of claim 1, wherein the first redundant power distribution system and the second redundant power distribution system are identical in structure, and the first redundant power supply system and the second redundant power supply system are identical in structure.
3. The direct current microgrid suitable for an ocean engineering vessel of claim 1, wherein the first redundant power supply system comprises a solar photovoltaic system, an energy storage device, a fuel cell, a first generator and a second generator, and the first redundant power distribution system comprises a first DC/DC converter, a second DC/DC converter, a third DC/DC converter, a first rectifier and a second rectifier;
the first DC/DC converter is electrically connected with the solar photovoltaic system, the second DC/DC converter is electrically connected with the energy storage device, the third DC/DC converter is electrically connected with the fuel cell, the first rectifier is electrically connected with the first generator, and the second rectifier is electrically connected with the second generator.
4. The direct-current microgrid suitable for an ocean engineering ship according to claim 1, wherein the first redundant variable-frequency control system and the second redundant variable-frequency control system are identical in structure.
5. The direct-current microgrid suitable for an ocean engineering ship according to claim 1, wherein the first redundant variable frequency control system comprises a first inverter, a third inverter, a first frequency converter and a second frequency converter, the first inverter is connected with a distribution electric board, the third frequency converter is connected with a maritime work motor, and the first frequency converter and the second frequency converter are respectively connected with a propulsion motor correspondingly.
CN201921981720.5U 2019-11-15 2019-11-15 Direct current micro-grid suitable for ocean engineering ship Active CN210985662U (en)

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