A method for automatically restarting a ship's DC networking system after power failure
An automatic restart and networking technology, applied in the direction of DC network circuit devices, electrical components, circuit devices, etc., can solve the problems affecting the continuity of power supply and operation safety of ships, and the power loss of the whole ship, so as to be easy to popularize and avoid downtime. Electric, method simple and effective effect
Active Publication Date: 2022-04-26
WUHAN MARINE ELECTRIC PROPULSION RES INST CHINA SHIPBUILDING IND CORP NO 712 INST
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Problems solved by technology
[0003] When a short circuit occurs on the DC bus, the capacitor discharge of each rectifier, frequency conversion unit and inverter power supply will blow the bus tie fuse to isolate the fault. The undervoltage protection of the unit and the inverter power supply, the daily power supply of the whole ship is provided by the inverter power supply, which will cause the whole ship to lose power, and it needs to be manually judged and eliminated before continuing to operate, seriously affecting the continuity and operation of the ship's power supply Safety
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[0010] Below in conjunction with example and accompanying drawing, the present invention is described in further detail.
[0011] The present invention aims to provide a simple and effective method for automatically restarting a DC networking system when it loses power, and realizes the functions of judging and automatically restarting the entire ship caused by a DC bus short circuit.
[0012] figure 1 It is a typical schematic diagram of the electric propulsion system of the DC networking system protected by the busbar through the fuse. The port DC bus, the starboard DC bus, the generator set D, the load M, the daily transformer and the controller form the ship DC networking system, including multiple The rectifier unit is connected to the DC bus branch and multiple frequency conversion unit loads are connected to the branch. The bus coupler and each branch are protected by fuses. Each generator branch is connected to a rectifier (R-1 ,R-2,...,R-n), each transformer branch a...
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The invention discloses a method for automatically restarting a ship's DC networking system after power failure. Current sensors are installed on each branch and bus coupler on the DC bus, and the current direction of each branch and bus coupler is collected by the current sensor. When the system occurs When the DC bus short-circuit fault occurs, the current sensor is used to collect the current of each branch and bus-connection on the DC bus, and the controller judges the direction of the current of each branch and bus-connection and the state of the protection device to determine the position of the short-circuit point. At the location of the point, the controller resets the undervoltage protection of the corresponding rectifier and frequency conversion unit in the non-fault area, and quickly restarts the branch circuit in the non-fault area to restore the power supply to the load and the daily distribution board.
Description
technical field [0001] The invention relates to a method for automatically restarting a ship's DC networking system when it loses power, which is suitable for protection recovery and restarting when the DC networking system loses power caused by a short circuit. Background technique [0002] The DC networking system is an improved form of the AC electric propulsion system. Compared with the current AC electric propulsion system, it has low comprehensive fuel consumption rate, energy saving and emission reduction, high integration, improved grid stability and power quality, and is beneficial to new The advantages of energy applications, so more and more applications in marine electric propulsion systems. In order to realize the selective protection of the system and reduce the cost, the fuse is used as the protective device of the bus tie. [0003] When a short circuit occurs on the DC bus, the capacitor discharge of each rectifier, frequency conversion unit and inverter pow...
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IPC IPC(8): H02J1/00
Inventor 龚博耿鹏龙飞张泽宇
Owner WUHAN MARINE ELECTRIC PROPULSION RES INST CHINA SHIPBUILDING IND CORP NO 712 INST