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舰船电力系统结构装置复杂,其设计与制造的好坏决定了舰船综合性能是否稳定高效,在其电力系统中,各个电子设备依附电网运行,保持电力系统整体稳定是舰船电力系统最基础的要求,因而对其稳定性分析显得尤为重要。本文通过对陆地电力应用的研究,试图寻找一个运用于舰船电网暂态稳定的系统,且设计优化一个满足条件的模型,最后利用时域仿真技术对此模型进行仿真,证明此模型对暂态稳定问题有效。 相似文献
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由于船舶运行的特殊性和负载波动的复杂性,严重影响船舶电力系统的稳定性,因此引入了能量存储技术,降低电网的波动。根据发电机和锂电池的状态空间模型,建立了含锂电池储能的船舶电力系统,并提出了一种基于模型预测控制的船舶电力系统。在含有负载波动的情况下,使发电机和锂电池的输出能够稳定跟随负载的变化,从而满足负载的需求。并将整个系统在Matlab/Simulink中进行实例仿真,仿真结果表明,在模型预测控制下的船舶电力系统能够很好地满足负载波动需求,明显改善船舶电力系统的稳态性能,增强船舶电网的稳定性。 相似文献
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船舶光柴储交流微电网系统小信号的稳定性研究 总被引:1,自引:1,他引:0
针对容量有限、光储单元容量较低的中小功率船舶光柴储交流微电网系统的稳定性问题,提出基于光储逆变器的船舶光柴储交流微电网多级控制策略。建立由柴油发电机组模型、光储系统模型以及与网侧功率模型构成的船舶光柴储微电网系统的小信号模型,分析系统内控制参数对状态矩阵特征值的影响,获得船舶光柴储微电网系统的暂态稳定性,确定稳定域内控制器参数的选择范围。最终获得船舶电网电压和频率的仿真结果,为船舶光柴储微电网系统的稳定运行和控制参数的设计提供重要的理论基础。 相似文献
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通过建立船舶供电系统整流同步发电机带恒功率负载的仿真模型,研究了突加、突卸恒功率负载工况下系统的暂态稳定性,确定了影响系统稳定性的各主要因素,并分别评估了其影响程度。分析结果对以后评判船舶综合电力系统带恒功率负载的稳定性具有重要意义。 相似文献
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《舰船科学技术》2018,(24)
暂态稳定性分析是船舶电力调速系统研究中的一个重要方向,为了使船舶电力调速系统的工作更加稳定和可靠,本文设计了基于神经网络的船舶电力调速系统暂态稳定性分析方法。首先对当前船舶电力调速系统暂态稳定性研究现状进行分析,并建立了船舶电力调速系统暂态稳定性分析的相关数学模型,然后采用神经网络对船舶电力调速系统暂态稳定性分析的数学模型进行求解,最后进行了船舶电力调速系统暂态稳定性的分析和测试,测试结果表明,本文方法可以描述船舶电力调速系统暂态稳定性的变化特点,获得了较高的船舶电力调速系统暂态稳定性分析精度,而且性能要优于其他船舶电力调速系统暂态稳定性分析方法,具有更加广泛的应用前景。 相似文献
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基于直流电网的船舶电力系统仿真研究 总被引:1,自引:0,他引:1
对船舶电力系统的发展现状以及主电网电制的选择进行了简要概述,通过对比国内外的发展现状以及交流电力系统和直流电力系统的优缺点,指出基于直流电网的船舶电力系统是未来船舶电力系统的发展方向。对基于直流电网的船舶电力系统的负载分配律进行了分析,随后在MATLAB/Simulink中建立了一种基于直流电网的船舶电力系统的仿真模型,仿真验证了该系统的可行性。 相似文献
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《船舶与海洋工程学报》2014,(2)
正In the paper"Influence of Fouling Assemblage on the Corrosion Behaviour of Mild Steel in the Coastal Waters of The Gulf of Mannar,India"in Vol.12,No.4,Page:509,References were lost,and the two authors’biographies were identical.The correct text is shown below.We apologize to the authors and our readers for any inconvenience caused by the errors. 相似文献
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《船舶与海洋工程学报》2014,(1):126-126
正San Francisco,California,June 8-13,2014.OMAE 2014 is the ideal forum for researchers,engineers,managers,technicians and students from the scientific and industrial communities from around the world to:·meet and present advances in technology and its scientific support;·to exchange ideas and experiences whilst promoting technological progress and its application in industry·to promote international cooperation in ocean,offshore and arctic engineering.In line with the tradition of excellence of previous OMAE conferences,more than 900 technical papers are planned for presentation.Outreach for Engineers Specialty Forum This Specialty Forum is designed for students and professionals who may not be familiar with the Ocean and Offshore industry,as well as those who have just recently specialized in this field. 相似文献
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联合作战计划和执行系统 总被引:2,自引:1,他引:1
全球指挥控制系统(GCCS)实施当前美国海军网络中心战信息基础设施的联合计划网络。联合作战计划和执行系统(JOPES)支持GCCS实现联合计划。JOPES有两类计划:时间不限的精密预案计划生成作战计划、方案计划或职能计划;时间敏感的危机行动计划生成作战命令或战役方案。前者在和平时期创建的作战计划是后者的计划基础,加速应付危机的能力。 相似文献
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Recent measurements of wave induced hull strain and flexure in RN warships are presented together with the derivation of the current design criteria for extreme hull girder bending loads. The history of the development of the shipboard instrumentation used is given and recent developments to improve the quality and ease of analysis of the data are described. An unexpectedly high transverse asymmetry in the longitudinal strains measured in destroyers is shown to be the result of a combination of vertical and lateral bending in oblique seas. Finally recent theoretical comparisons between the loading of Deep-Vee hulls and conventional UK rounded bilge hulls are presented which demonstrate the higher loading experienced by this type of hull form. 相似文献
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《船舶与海洋工程学报》2014,(1)
正19–24 October 2014 SingaporeCONFERENCE THEMES The overall aim of the ICHD Conference is to provide a forum for participants from around the world to review,discuss and present the latest developments in the broad discipline of hydrodynamics and fluid mechanics.The first International Conference on Hydrodynamics(ICHD)was initiated in 1994 in Wuxi,China.Since then,9 more ICHD conferences were held subsequently in Hong Kong,Seoul,Yokohama,Tainan,Perth,Ischia,Nantes,Shanghai and St Petersburg.Evidently the ICHD conference has become an important event among academics,researchers,engineers and operators,working in the fields closely related to the science and technology of hydrodynamics.The 11th ICHD will be held in Singapore in 2014. 相似文献
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《船舶与海洋工程学报》2014,(2)
正November 4-6,2014Moody Gardens HotelConvention Center/Galveston,TX The Deepwater Operations Conference and Exhibition is celebrating its 12th anniversary this year.This growing event will continue the tradition of excellence in addressing operational challenges involved in developing deepwater resources.We will return to the Moody Gardens Hotel and Convention Center on November 5-7,2014 in Galveston,Texas. 相似文献
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In terms of equal sailing distances, where is the inflexion when ships depart from ports in the Asian Continent to New York via Suez and/or Panama?
The answer is China South Port Group (Hong Kong, Shenzhen and Guangzhou). 相似文献
The answer is China South Port Group (Hong Kong, Shenzhen and Guangzhou). 相似文献
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Gunnar Alexandersson Staffan Hultén Frode Longva 《Research in Transportation Economics》2010,29(1):212-218
Despite the many socio-economic similarities between Sweden and Norway, differences in jurisdiction, organisation, cooperation, and financing of long-distance passenger train and coach services have led to the development of four distinctively different ways of serving the markets. This paper describes how the train and coach markets have developed in the two countries, with emphasis on regulatory and industrial structure and a couple of performance variables.Looking at passenger rail, both countries separated infrastructure from operation over a decade ago. However, while Norwegian rail is characterised by an almost monopoly supplier, rail services in Sweden are partly decentralised to the responsibility of county authorities and are widely subjected to competitive tendering. The rest of the network is about to be opened up for on-the-track competition. Swedish Rail (SJ) has spent the last decades consolidating its core business (passenger rail) and sold out its other businesses. In contrast, the Norwegian state rail (NSB) has expanded its business to become a major bus operator and property owner, with extensions also into the Swedish market.The coach industry was more recently deregulated in both countries. The Swedish coach market is dominated by privately owned companies operating services to and from Stockholm. In Norway, state-owned NSB is a major coach operator on medium distance routes, and is also the largest partner of Nor-Way Bussekspress which totally dominates long-distance coach services. Further, the Norwegian coach market is characterised by cross-ownership and cooperation which has enabled an extensive route network which covers most of Norway.We find distinct differences in achievements in the two modes and in the two countries. Swedish rail services have succeeded in winning market shares and in renewing and developing both infrastructure and service levels to a greater extent than the Norwegian model. On the other hand, the Norwegian coach market seems to be more developed and efficient compared to its Swedish counterpart.The paper concludes with a discussion on the possible links between the different approaches and the performance observed, with the aim to stimulate further and more detailed research on some important issues. 相似文献