Protection design method based on closed-loop ship power system
A power system and protection design technology, applied in the direction of emergency protection circuit devices, electrical components, etc., can solve problems such as the increase in power system protection requirements, and achieve the effects of improving safe and reliable operation, reducing the scope of influence, and ensuring selectivity
Pending Publication Date: 2020-11-13
中国船舶重工集团公司第七0四研究所
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Problems solved by technology
[0005] The present invention is aimed at the problem that the closed-loop power operation system of the ship dynamic positioning needs to improve the power system protection, and proposes a protection design method based on the closed-loop ship power system. Isolate the fault, prevent the fault from spreading, and ensure the normal power supply of the rest of the power system, so that the ship can maintain its position under any circumstances
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[0033] This protection design method based on the closed-loop ship power system is to divide the power system into several "regions", such as figure 1 As shown in the dotted line area, each area includes generator set DG, 11kV switchboard, transformer, propulsion frequency converter, and propulsion motor M. Each area has an independent system detection and protection scheme, and each area constitutes a complete system protection design Program.
[0034] Advanced Short Circuit and Ground Fault Protection:
[0035] For DP2 / DP3 class dynamic positioning ships, the normal working condition provided by classification societies such as DNV is the open operation mode of the bus tie circuit breaker. In order to achieve proper protection and isolation effects when the closed-loop bus coupler is used, this design method proposes additional protection methods and devices.
[0036] This technical solution introduces the regional protection concept of busbar differential protection and d...
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The invention relates to a protection design method based on a closed-loop ship power system, which mainly aims to achieve grid-connected operation of at least two generator sets so as to provide power supply as long as possible. By means of a complete system-level protection scheme, an advanced generator protection device, a hidden fault monitoring and backup protection scheme and a test verification method, when a single-point fault, a hidden fault and other faults happen to the system, only the fault loop is cut off as soon as possible, and the fault related range is minimized. Meanwhile, the selectivity of the system is considered, continuous power supply of a non-fault loop is guaranteed to the maximum extent, normal power supply of other power systems is guaranteed, and a ship can keep the position under any condition, so that safe and reliable operation of the whole power system is improved. The method has the obvious advantages that when a system fault occurs, only one fault generator set or one busbar is isolated, so that the influence range of the fault is greatly reduced.
Description
technical field [0001] The invention relates to a power system control technology, in particular to a protection design method based on a closed-loop ship power system. Background technique [0002] Dynamically positioned vessels utilize variable frequency drive thrusters to maintain position during operations such as oil and gas drilling operations, positioning, anchoring and port maneuvering. One of the requirements for the safe operation of a ship is that there be no failures that could lead to serious loss of the ship's position. DP3 level is currently the highest dynamic positioning level of the International Maritime Organization, and ships adopting DP3 level dynamic positioning have higher requirements on the power system. [0003] In recent years, domestic and foreign requirements for emissions have become higher and higher. It has become a consensus in the industry that the power supply mode of the dynamic positioning system of high-end marine engineering equipment...
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Login to View More IPC IPC(8): H02H7/00H02H7/04H02H7/06H02H7/22H02H7/26
CPCH02H7/00H02H7/04H02H7/06H02H7/062H02H7/22H02H7/226H02H7/228H02H7/26
Inventor 张元玮王平余正东田野王世伟葛永强苏鸿涛
Owner 中国船舶重工集团公司第七0四研究所