柴油发电机组并联运行的鲁棒控制研究

船舶电力系统通常是多台柴油发电机组并联运行,多机组并联运行容易发生功率传递,从而产生功率振荡现象。本文给出了两台柴油发电机组并联运行的数学模型,为柴油发电机组设计了非线性鲁棒综合控制器,并给出了将非线性鲁棒综合控制器应用于柴油发电机组并联运行控制的仿真结果。表明,两台柴油发电机组的功角差为零,抑制了柴油发电机组并联运行的功率振荡现象,改善了电力系统的稳定性。     

舰船综合电力系统发电机组投切条件分析

由于采用大小容量发电机组配置方式,舰船综合电力系统发电机组投切条件与采用等容量发电机组配置的传统舰船电力系统发电机组投切条件不尽相同。以英国皇家海军45型驱逐舰综合电力系统为例,分析了其不同运行工况下的机组运行方式,根据设计经验,给出了其可能的发电机组投切条件。     

西门子公司电站保护系统

正柴电推进电站包括了电力系统应有的所有断路器标准保护单元(如过电流保护、逆功率保护、差动保护装置)。但是,对柴电电力系统必须确保发电机组的选择性脱扣性能达到100%,这样才能避免在功率和推进方面的损耗,特别是在母联开关闭合期间的损耗。因此,利用像西门子电站保护系统这样的综合监管系统对发电机组进行管理是十分必要的。该系统对下列情况导致     

船舶电力系统燃气轮机组双机并联运行建模与仿真

海洋船舶正朝着超大型方向发展,燃气轮机凭借其启动速度快,功率密度大等特点,正越来越多的被应用到船舶电力系统的发电系统中。同时由于全电船的出现,中压电力系统正逐渐成为大型海洋船舶电力系统的发展方向。由于电力推进船的电动机单机容量大于发电机单台容量,通常会使多台发电机并联运行,从而保证电站的可靠性以及使发电机运行在最佳状态。本文通过对以燃气轮机作为原动机的4.16k V船舶中压电力系统进行建模,同时对发电机组并车工况进行仿真。仿真实验验证了此系统模型的正确性,可以用于船舶中压电力系统运行工况的仿真和分析。     

基于突变理论的舰船发电机组运行状态评价

为评价舰船电力系统发电机组运行状态,对舰船电力系统发电机组进行多层目标模糊分解;利用突变理论描述发电机组的运行状态,从而对其运行状态进行模糊综合分析和评价.分析了电压波动对系统工作状态的影响,并通过拟合得到了系统稳定性波动与电压之间的关系,为评价舰船电力系统的运行状况提供了一种新思路.     

浅析“DC轮”电站的典型故障

<正>0引言船舶电站是船舶的重要组成部分,也是船舶电力系统的核心,它的可靠运行对船舶的安全至关重要。船舶电站由发电装置和配电装置组成,一般设置有3台同容量、同型号的发电机组,通常仅有1台或者2台发电机向电网供电。发电机转速的变化及负载的投入和切除都直接对电网频率、电压产生较大的波动,因此,船舶发电机组要有较高品质的调速和调压装置。除此     

电网失电恢复及互锁模块化设计

在船舶电力系统运行过程中，由于发电机组故障有时会造成电网失电，影响船舶正常运行。因此，为保证船上重要用电设备的正常、不间断工作，设计了船舶电网失电自动恢复功能模块，以及相应的恢复供电时，防止多台机组同时合闸的互锁模块。     

透平与往复式发电机的组网调试方法研究

本文依据已完成的渤中13-1油田降压增产项目新增的3台950k W(额定功率,6.3k V,3Ph,3W,50Hz)燃气发电机组与平台现有的两台2台4,800k W(额定功率,6.3k V,3Ph,3W,50Hz)燃气透平发电机组的组网测试,探讨了特性不同,且机组容量相差较大的发电机组的并网运行。     

柴油发电机组频率不稳故障分析与解决

柴油发电机组作为电力供应单元,广泛运用于工业和民用领域。随着科技进步,用电设备对电源输出的稳定性提出更高的要求,生产实践中应尽量避免因发电机组故障导致电力系统频率波动甚至供电中断。针对柴油发电机组运行时出现的频率不稳故障现象,采用故障树分析法建立起发电机组频率不稳故障树,对频率不稳故障原因进行逐步分析,阐述故障快速查找与定位的方法,最终确定故障点,并通过调试将故障排除。     

一种舰船发电系统可靠性分析方法及其应用

发电机组运行的可靠性是电力系统供电可靠性的一个关键环节,本研究在状态空间分析理论的基础上,建立了舰船电力系统负荷和电站发电机组的概率模型,介绍了舰船发电系统的可靠性分析方法。举一实例进行分析,得出可靠性分析结论。     

Errata

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.     

Journal of Marine Science and Application 2014 Sum. Contents

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33rd International Conference on Ocean,Offshore and Arctic Engineering （OMAE2014）

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.     

联合作战计划和执行系统

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。     

Recent progress on wave induced loading measurements in warships

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.     

The 11th International Conference on Hydrodynamics (ICHD 2014)

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.     

第十二届深水操作会议和展览会(英文)

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.     

Eastbound or westbound ?

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）.     

Impact of regulation on the performances of long-distance transport services: A comparison of the different approaches in Sweden and Norway

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.     

某海港码头的撞损修复

依据码头撞击受损区域调查检测结果,对受损构件提出合理的修复方案,为码头的安全运行提供保障。