船舶直流电推系统选择特性的短路故障模拟

近年来船舶直流推进系统应用越来越多,为保障推进系统的可靠性,市场上普遍采用基于快速熔断器的方案,但是如何进行准确的短路计算、预测短路现象并基于此进行快速熔断器的选型,一直是业界不断被讨论与研究的热点。本文针对该问题,对船舶直流电推系统发生短路时的主要短路源、线路状况及关键器件进行分析,采用基于设备参数的选择性保护分析与建模方法,对船舶直流电推系统选择性进行短路故障模拟。针对某一工程船舶应用,搭建与实际系统对应的仿真模型,对比仿真结果及短路试验结果,可以看出熔断器熔断时间,电压变化趋势及电压跌落情况都基本一致,仿真结果能有效的预测实际的短路结果及现象。本文提供了一种工程上可应用的仿真建模方法,能较准确的预测熔断器的动作情况,在系统设计阶段为快速熔断器的选择、系统的配置提供有力的支撑。

Short Circuit Fault Simulation for Selection Characteristics of Ship DC Electric Propulsion System

In recent years, DC electric propulsion system has been used for ships more and more. In order to ensure the reliability of propulsion system, the scheme based on fast fuse is widely used in the market. However, how to accurately calculate the short circuit, predict the short circuit phenomenon and select the type of fast fuse based on this is always a hot topic in the ship industry. To solve this problem, the main short-circuit sources, line conditions and key components were analyzed when the ship DC electric propulsion system was short circuited. In order to apply to most engineering applications, the selective protection analysis and modeling method based on equipment parameters was used to build the selective protection model of ship DC system based on fuse. According to the application of a certain engineering ship, a simulation model corresponding to the actual system was built. By comparing the simulation results with the short-circuit test results, it was shown that the fuse fusing time, voltage change trend and voltage drop were basically the same. The simulation results could effectively predict the actual short-circuit results and phenomena. A simulation modeling method that can be applied in engineering has been provided, which can accurately predict the action of fuse, and provide strong support for the selection of fast fuse and system configuration in the system design stage.