CAN bus in the electric vehicle monitoring system of Abstract Now, CAN, high-performance and reliability has been recognized and was widely used in industrial automation, marine, medical equipment, industrial equipment, and so on. Field Bus is the development of automation technology One of the focuses of the area known as automated computer LAN. It is a distributed control system to achieve real-time between the nodes, reliable data communications providing strong technical support. CAN bus belonging to the scene of the areas, it is an effective support for real-time control of distributed control or serial communication network. Compared with many of the current RS-485 based on the R line Construction of the Distributed Control System, based on the CAN bus distributed control system has obvious advantages. In this paper, occupies a lot of relevant information based on the comprehensive use of various methods of the CAN bus in the electric vehicle monitoring system in the application of theory and an analysis of development issues, and some of the problems raised his own views. The full text is divided into four parts: The first part of the main topics on the background and content of the subjects studied in the context of topics to write on the CAN bus status and significance in the research described in the content of the object of measurement requirements and complete the task of this paper. The second part, write data acquisition module design, from the SJA1000 CAN-based communications port design, acquisition, the electric car design; electric car design capacity of the collection node consists of three parts. The third part, mainly to write the electric vehicle monitoring network design, the first Fieldbus awakened comparison and choice, selected after the introduction of the CAN bus, the last of the SJA1000 CAN bus controller is introduced. The fourth part is really on the reliability of the system design for discussion, data from the calibration, the anti-jamming software and hardware design of the anti-jamming design in three areas to address the reliability of the system problems. Key words :Fieldbus; CAN bus; SJA1000; nodes;
查到10篇关于电动车的文献。我想能适合楼主的可能有个一篇两篇吧。如果楼主感兴趣，可以发邮件到，我发给你全文。[1]O'Keefe, M., K. Bennion, and N.R.E. Laboratory, Comparison of Hybrid Electric Vehicle Power Electronics Cooling Options. 2008: National Renewable Energy Laboratory.[2]Shabashevich, A., et al., Consumer Ready Plug-in Hybrid Electric Vehicle. Team-Fate, University of California, Davis. http://www. teamfate. net/technical/UCDavis_Spring2007_TechReport. pdf, 2007.[3]Rousseau, A., S. Pagerit, and D. Gao. Plug-in Hybrid Electric Vehicle Control Strategy Parameter Optimization. 2007.[4]Syed, F., et al., Derivation and Experimental Validation of a Power-Split Hybrid Electric Vehicle Model. IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY, 2006. 55(6): p. 1731.[5]Moreno, J., M. Ortúzar, and J. Dixon, Energy-Management System for a Hybrid Electric Vehicle, Using Ultracapacitors and Neural Networks. IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS, 2006. 53(2).[6]Miller, J., Hybrid Electric Vehicle Propulsion System Architectures of the e-CVT Type. IEEE Transactions on Power Electronics, 2006. 21(3): p. 756-767.[7]Markel, T. and A. Simpson. Plug-In Hybrid Electric Vehicle Energy Storage System Design. 2006.[8]Wang, C., O. Stielau, and G. Covic, Design considerations for a contactless electric vehicle battery charger. Industrial Electronics, IEEE Transactions on, 2005. 52(5): p. 1308-1314.[9]Musardo, C., et al. A-ECMS: An Adaptive Algorithm for Hybrid Electric Vehicle Energy Management. 2005: IEEE; 1998.[10]Faiz, J., et al., Sensorless direct torque control of induction motors used in electric vehicle. Energy Conversion, IEEE Transactions on, 2003. 18(1): p. 1-10.
英文文献，推荐到Oa图书馆查询。输入相应的英语关键词即可。翻译一般得自己做了。
Computer aided design of an axial-field PM brushless DC motor for an electric vehicle， Concept of the “KAZ”, the Start of a New Generation in Car Design， Conceptual Design of Hybrid Electric Vehicle for Urban Use in China， Consumer Education - An Essential Element in the Acceptance of the Electric Vehicle， Control and Management Strategies for the Delphi High Power Lithium Battery， Control of a Continuously Operated Pole-Changing Induction Machine， Control of compact hybrid drive consisting of PM motor and planetary transmission CVT，Control of independent rear wheel drives for electric and hybrid vehicles using one neuro-fuzzy controller， Controller-induced parasitic torque ripples in a PM synchronous motor， Coordination of Charging Stations for Electric Vehicles， Coupled Electrochemical and Thermal Analysis of Electric-Vehicle Battery Modules， Current Activities of Standardisation in Japan， Current Status Report on U.S. Department of Energy Electric and Hybrid Electric Vehicle Energy Storage R&D Programs， Current-mode control for sensorless BDCM drive with intelligent commutation tuning， DaimlerChrysler EPIC Minivan Powered by Lithium-Ion Batteries， Design and analysis of a new multiphase polygonal-winding permanent-magnet brushless DC machine， Design and development of the 2001 Michigan Tech FutureTruck, a power-split hybrid electric vehicle， Design and development of the 2002 Comell University hybrid electric vehicle， Design and development of the 2002 Michigan Tech FutureTruck, a parallel hybrid electric vehicle， Design and development of the 2002 Penn State University parallel hybrid electric explorer, the Wattmuncher。翻译计算机辅助设计轴向场永磁无刷直流电动机的电动车，概念的“哈萨克斯坦” ，开始了新一代车设计，概念设计的混合动力电动车在城市中使用，消费者教育-一个基本要素接受电动车，控制和管理战略，德尔福高功率锂电池，控制不断操作变极异步电机，紧凑的控制组成的混合动力驱动永磁电机和行星传动无级变速器，控制独立后轮驱动的电动和混合动力车使用一个神经模糊控制器，控制器诱导寄生转矩脉动的永磁同步电机，协调收费站的电动车，加上电化学与热分析的电动汽车电池模块，当前的活动标准化在日本，目前状况的报告对美国能源部电力和混合动力电动汽车储能研发项目，电流模式控制传感器无刷直流电动机驱动器与智能折算调整，戴姆勒克莱斯勒史诗休旅本站由锂离子电池，设计与分析新的多相多边形绕组永磁无刷直流电机，设计和发展的2001年密歇根理工FutureTruck ，权力分割混合动力电动汽车，设计和发展的2002年康奈尔大学的混合动力电动汽车，设计和开发的技术在2002年密歇根州FutureTruck ，一个平行式混合动力电动汽车，设计和发展的2002年宾夕法尼亚州立大学并联式混合动力电动Explorer时， Wattmuncher
提供一些商务英语专业毕业论文的题目，供参考。1. 《影响中国学生英语口语流利性的障碍研究》 2. 《跨文化交际中英语口语能力的培养》3. 《商务英语的特点及翻译技巧》4. 《商务英语函电在对外贸易中的作用》5. 《单证员/报关员/跟单员等在国际贸易中的地位》6. 《商务英语函电翻译技巧》7. 《商务谈判中英语的重要性》8. 《浅谈出口结汇风险的防范》9. 《中国退税制度的改革及其影响》10. 《商标名称的翻译与策略》11. 《外贸企业信用风险管理与控制》12. 《２００７年外资银行在我国本土注册探讨》13. 《我国利用国际贷款/国际援助现状分析》14. 《WTO与我国反倾销探讨》15. 《我国对外直接投资之现状》16. 《内陆地区对外贸易发展策略研究》17. 《中印两国两国对外贸易战略分析》18. 《人民币升值对我国出口贸易的影响》19. 《浅谈商务英语写作时避免修饰语错位的方法 》20. 《商务函电翻译的用词技巧》21. 《外商直接在华投资探讨》22. 《社会文化迁移对中国式英语的影响》23. 《我国外贸出口品牌战略的实施与研究》24. 《商务英语专业口语课程教学探讨》25. 《入世对我国农产品贸易的影响与对策研究》26. 《应对经济全球化，加快我国企业跨国经营》27. 《英语写作中常见中式英语分析》28. 《入世商务英语写作的研究》29. 《制单工作在国际结算中的地位》30. 《关税壁垒与非关税壁垒探讨》31. 《浅谈实质利益谈判法》32. 《国际电子商务发展面临的新问题》33. 《学生商务英语写作中的错误与商务英语写作教学之间的关系》34. 《大学生在运用定语从句时常见错误及分析其原因》35. 《跨国公司在华扩张模式透析》36. 《汉译英中遇到新词语的译法问题》37. 英汉互译中词义的不对应（文化意义、风格意义、修辞意义等）38. 形象语在写作中的修辞效果39. 形象语在英汉诗歌互译中处理手段上的差异40. 我国中小企业开拓国际市场之探讨41. ＂１０＋１＂自由贸易区未来前景展望42. 汉语中新词汇的翻译技巧43. 商务英语的特征与翻译44. 珠江三角洲外贸现状及存在的问题45. 南昌现利用外资纵谈46. 广州／深圳等地区三资企业结构分析47. 浅谈广州等地区外贸企业的困境与出路
你先咨询自己的导师，如果她没说，就找机构咨询一定会帮助你。
2012年02月13日 09时00分，《英语:英语论文：浅论商务函电的用词特点和词汇翻译技巧[1]》由liuxue86.com英语我整理. cover such cases. 这些规定适用于这类情况。 2.Are the goods covered against fire damage? 这批货物保了火险吗? 3.I’ll cover for Jane while she’s on holiday. 简休假时我替补她工作。 以上的三个句子中的cover分别代表了包含，投保，代替的含义，而在实际商务英语中，它的含义更加丰富，如果不能根据上下文正确地翻译出来，张冠李戴的话，其句子意思将会相差甚远，造成严重的偏差，导致贸易不能顺利进行。 其次，商务英语中存在大量的专业术语，所谓专业术语，指特定领域对一些特定事物的统一的业内称谓。专业术语在国际惯例中是通用的，专业术语可以用在各行各业中，比较明显常用在商务学和各门专业技术上。也就是说，某些英文词汇，只有用在商务中才会有这一特定的表达方式和含义，如果不掌握这些就盲目按照常用含义来套用的话，必定是牛头不对马嘴的。请看以下几个例子; 论文论文参考网1.He offered me a glass of wine. 他端给我一杯酒。 2.They offered to help me. 他们表示愿意帮助我。 3.She travels whenever the opportunity offers. 她一有机会就去旅行。 4.We could offer you wood pulp at attractive prices. 我们能以具有吸引力的价格就木浆报价给你方。 5.Please make us an offer CIF London for 20 metric tons of brown cashmere. 请给我们20公吨棕色开司米要毛成本加运保费到伦敦的报盘。 这个关于offer的简单的例子直观地体现出专业术语和常用英语的区别，在商务英语中，它往往指的就是报价的含义，而这在日常英语中比较罕见，因此，正确掌握专业术语的含义和实用方式将帮助我们更好地理解信函，翻译信函。 在商务函电的英汉互译中，对于词汇的翻译还要注意词汇的词性的转义，尤其是名词和动词，介词和动词的转义。比如说favor用作名词表示偏好，利益，用作动词表示有利于等。这样的例子在函电中十分常见，因此在具体的句子中一定要仔细分析句子结构，剖析长句句式，准确地找出词汇的词性并做出相应的翻译。 总在，外贸函电翻译是一门综合性强的工作，包含了词汇，语法，语境，用词技巧等等方面的内容，在实际的翻译工作中，只要扎实地掌握其用词的规律，就能摸索出其翻译的技巧。因此，它需要学习者不断地练习以完善函电的写作。 参考文献： [1]张新红．商务英语翻译(英译汉)[M]．北京：高等教育出版社，2003. [2]翁凤翔. 当代国际商务英语翻译.上海:上海交通大学出版社,2007. [3]李平.国际经贸英语教程.中国国际广播出版社, 1999.
1、论文化因素对英汉翻译的影响2、商务英语的特点及翻译技巧3、商务函电翻译的用词技巧4、商标名称的翻译与策略5、汉语中新词汇的翻译技巧6、商务谈判中的语言艺术7、商务谈判的文化障碍8、商务英语函电在对外贸易中的作用9、商务英语函电翻译技巧10、商务谈判中英语的重要性11、浅谈商务英语写作时避免修饰语错位的方法 12、礼仪在商务谈判中的作用13、浅谈涉外合同英语特色14、电子商务对国际贸易的影响及对策15、商务谈判的艺术性16、跨文化的商务谈判
作为一名即将毕业并且已经拟录取为研究生的大学生，对毕业论文的准备也有一阵子了。自己尝试过很多文献翻译工具，也踩过很多雷，今天把我觉得不错的几个工具推荐给大家，希望能对各位有所帮助。
第一个就是deepl Pro。这款翻译工具口碑非常不错，可能很多人已经用过这个了，这个也是我最近用的最频繁文献翻译工具了。它支持一键翻译整个文档，而且字体、图片格式都不会发生改变，并且没有那么种严重的“机翻”的味道，翻译的更加地道。你可以随便编辑翻译之后的文档。还有一点就是，它的数据很安全，当翻译完成之后，网站会立即删除所有文本文档记录，并且会对相应链接加密。
第二个就是QuillBot。这个是可以支持帮你润色文献语句的，它可以帮你巧妙的替换掉一些不恰当的的词汇语句，把他们替换为高级的形式，这个对查重的用户还是非常有帮助的。
个人感觉第一个和第二个搭配起来非常好用，基本是可以满足大家的文献相关的学习。下面再给大家推荐三个我觉得还比较不错的工具，大家也可以试一试。
一个是scitranslate。这个翻译工具也是很不错的，它的用法很简单，但是却很实用。它最大的优点就是不会改变原文献的排版，打开之后点击一下谷歌翻译，就会成功翻译出pdf里边的内容。同时会给你提供两个类似平行世界的界面，一边是英文文献，另一边是翻译过来的中文文献翻译。你可以通过两边进行相互对照，达到更快的阅读的目的，能够更快地提高效率。
还有一个是copytranslate。这个其实也比较好用，它为用户们提供了很多种翻译的方法，当用户输入源语言时候，点击选择想翻译的另一种语言，就会立刻翻译出来。源语言包括很多种语言可以选择。同时，它里边还包括很多翻译引擎可以选择，包括百度、谷歌、搜狗等。总之用起来比较个性化，比较方便而且也很实用。但是也有它的缺点，最大的缺点就是可能时不时的出现某些翻译问题。
最后一个就是知云文献翻译。这款软件可以对照PDF直接进行翻译，对于我们不太理解的地方，可以直接选中，然后点击翻译，这款软件真的比较实用，很不错。
以上都是我自己觉得用着还比较方便的工具，大家可以按着这几个试一试，寻找一款自己用着舒服的，或者互相搭配着使用，希望能帮到大家。
问题一：毕业论文外文翻译是什么意思？有什么要求？ 外文翻译要求：（1）选定外文文献后先给指导老师看，得到老师的确认通过后方可翻译。（2）选择外文翻译时一定选择外国作者写的文章，可从学校中知网或者外文数据库下载。（3）外文翻译字数要求3000字以上，从外文互章起始处开始翻译，不允许从文章中间部分开始翻译，翻译必须结束于文章的一个大段落。 问题二：请问一下本科毕业论文里面的翻译是什么东东？ 你好的！ 那篇翻译是国外人写的论文之类的！ 你仅仅需要找到一份相关的英文原文进行翻译即可！ 找的原文不是类似的！ 而是，只要相关就成！ ==================论文写作方法=========================== 论文网上没有免费的，与其花人民币，还不如自己写，万一碰到人的，就不上算了。 写作论文的简单方法，首先大概确定自己的选题，然后在网上查找几份类似的文章，通读一遍，对这方面的内容有个大概的了解！ 参照论文的格式，列出提纲，补充内容，实在不会，把这几份论文综合一下，从每篇论文上复制一部分，组成一篇新的文章！ 然后把按自己的语叮把每一部分换下句式或词，经过换词不换意的办法处理后,网上就查不到了,祝你顺利完成论文! 问题三：毕业论文 译文 是什么意思 一般论文只需把摘要和题目翻译成英文即可，如果说译文的话，或许是要全文翻译的英文场照。你直接问下老师就好了 问题四：论文是什么意思 编辑本段简介 学术论文就是用来进行科学研究和描述科研成果的文章，简称为论文。它既是探讨问题进行科学研究的一种手段，又是描述科研成果进行学术交流的一种工具。它包括学年论文、毕业论文、学位论文、科技论文、成果论文等，总称为学术论文。 编辑本段论文格式 1、论文格式的论文题目：（下附署名）要求准确、简练、醒目、新颖。 2、论文格式的目录 目录是论文中主要段落的简表。（短篇论文不必列目录） 3、论文格式的内容提要： 是文章主要内容的摘录，要求短、精、完整。字数少可几十字，多不超过三百字为宜。 4、论文格式的关键词或主题词 关键词是从论文的题名、提要和正文中选取出来的，是对表述论文的中心内容有实质意义的词汇。关键词是用作计算机系统标引论文内容特征的词语，便于信息系统汇集，以供读者检索。每篇论文一般选取3-8个词汇作为关键词，另起一行，排在“提要”的左下方。 主题词是经过规范化的词，在确定主题词时，要对论文进行主题分析，依照标引和组配规则转换成主题词表中的规范词语。（参见《汉语主题词表》和《世界汉语主题词表》）。 5、论文格式的论文正文： （1）引言：引言又称前言、序言和导言，用在论文的开头。引言一般要概括地写出作者意图，说明选题的目的和意义, 并指出论文写作的范围。引言要短小精悍、紧扣主题。 〈2）论文正文：正文是论文的主体，正文应包括论点、论据、论证过程和结论。主体部分包括以下内容： a.提出问题-论点； b.分析问题-论据和论证； c.解决问题-论证方法与步骤； d.结论。 6、论文格式的参考文献 一篇论文的参考文献是将论文在研究和写作中可参考或引证的主要文献资料，列于论文的末尾。参考文献应另起一页，标注方式按《GB7714-87文后参考文献著录规则》进行。 中文：标题--作者--出版物信息（版地、版者、版期） 英文：作者--标题--出版物信息 所列参考文献的要求是： （1）所列参考文献应是正式出版物，以便读者考证。 （2）所列举的参考文献要标明序号、著作或文章的标题、作者、出版物信息 问题五：毕业论文说有雷同是什么意思 论文雷同是指有些段落和已经发表的重复，就是说你有些段落，是抄的，要改成自己的话，保持学术独创性。 第一步：初稿一般重复率会比较高(除非你是自己一字一句写的大神)，可以采用万方、papertest去检测，然后逐句修改。这个系统是逐句检测的，也就是说你抄的任何一句话都会被检测出来。这种检测算法比较严格，从程序的角度分析这种算法比较简单。因而网上卖的都很便宜，我测的是3万字，感觉还是物美价廉的。(注意：1 这个库不包含你上一届研究生师兄的大论文，修改一定注意. 2 个人建议如果学校是用万方检测，就不要去检测维普之类的 先把论文电子版复制一份，保存一份。看检测结果，其中一份复制的备份论文，把检测出重复的部分能删了先删了，把不能删的，15字以内改一改，最好是加减字符，不要改顺序，改顺序没太大用，参考文献删掉一部分，不能删的话，先改下，英文文献可以15个字符换一个词。把修改过的上交，重新过系统检查。保存的原论文稍做改动上交纸质版。那个系统很麻烦的，很多没看过没应用过的文献都能给你加上，可见中国人抄袭的功夫，都是互相抄，但是为了保证论文的完整性和表述的准确性，不要随意改动，上交的纸质版，一定要斟酌，一般检查完就不会再过检测系统了，所以纸质版的不用担心。 第二步：经过修改后，重复率大幅下降了。这时你可以用知网查了，知网查重系统是逐段检测的，比较智能。检测后再做局部修改就基本上大功告成了，我最后在网上用知网查是4%，简单修改后，在学校查是1.5%。 注意：记住，最忌讳的是为了查重，把论文语句改得语句不通、毫无逻辑，这样是逃不过老师的，哈哈，大家加油！ 关于知网相关抽查规定： 有规定的，可以进行第一次修改，修改之后通过就可以答辩，如果第二次不通过就算结业，在之后4个月内还要交论文或者设计的。这个是在抄袭30%的基础上的。 如果抄袭50%以上的话，直接结业 在之后4个月内还要交论文或者设计的。1．被认定为抄袭的本科毕业设计（论文），包括与他人已有论文、著作重复总字数比例在30%至50%（含50%）之间的，需经本人修改。修改后经过再次检测合格后，方可参加学院答辩。再次检测后仍不合格的，按结业处理。须在3 个月后提交改写完成的毕业设计（论文），检测合格后再参加答辩。2．被认定为抄袭的本科毕业设计（论文），且与他人已有论文、著作重复总字数比例超过50%的，直接按结业处理。须在4 个月后提交改写的毕业设计（论文），检测合格后再参加答辩。 知网系统计算标准详细说明： 1．看了一下这个系统的介绍，有个疑问，这套系统对于文字复制鉴别还是不错的，但对于其他方面的内容呢，比如数据，图表，能检出来吗？检不出来的话不还是没什么用吗？ 学术不端的各种行为中，文字复制是最为普遍和严重的，目前本检测系统对文字复制的检测已经达到相当高的水平，对于图表、公式、数据的抄袭和篡改等行为的检测，目前正在研发当中，且取得了比较大的进展，欢迎各位继续关注本检测系统的进展并多提批评性及建设性意见和建议。 2．按照这个系统39%以下的都是显示黄色,那么是否意味着在可容忍的限度内呢?最近看到对上海大学某教师的国家社科基金课题被撤消的消息,原因是其发表的两篇论文有抄袭行为,分别占到25%和30%. 请明示超过多少算是警戒线？ 百分比只是描述检测文献中重合文字所占的比例大小程度，并不是指该文献的抄袭严重程度。只能这么说，百分比越大，重合字数越多，存在抄袭的可能性越大。是否属于抄袭及抄袭的严重程度需由专家审查后决定。 3．如何防止学位论文学术不端行为检测......>> 问题六：毕业论文一二三稿指的是什么意思 实在抓不准的话，去找国涛期刊 通过撰写毕业论文，提高写作水平是干部队伍“四化”建设的需要。党中央要求，为了适应现代化建设的需要，领导班子成员应当逐步实现“革命化、年轻化、知识化、专业化”。这个“四化”的要求，也包含了对干部写作能力和写作水平的要求。 提高大学生的写作水平是社会主义物质文明和精神文明建设的需要。 问题七：毕业论文的abstrac是什么意思 abstract 摘要的意思。 论文要有中文摘要，也要有英文摘要（abstract） 问题八：毕业论文是什么意思？英文文献翻译，急需 毕业论文Graduation thesis 问题九：毕业论文中的外文翻译可以在什么网站找到？非常感谢！ 学校的数据库，中国知网应该都有，根据专业也可以选择国外比较有名的数据库，推荐几个我用过的吧 ABI，ACM，ASTP，American Chemical Society ，Blackwell Science-Blackwell synergy EBSCO综合类，强烈推荐，Engineering Index 工科是离不开EI的，IEEE 电子类必备，HighWire Press，ISI学术权威 ，National Technical Information Service 个人比较喜欢的，推荐 问题十：毕业论文外文翻译是什么意思？有什么要求？ 外文翻译要求：（1）选定外文文献后先给指导老师看，得到老师的确认通过后方可翻译。（2）选择外文翻译时一定选择外国作者写的文章，可从学校中知网或者外文数据库下载。（3）外文翻译字数要求3000字以上，从外文互章起始处开始翻译，不允许从文章中间部分开始翻译，翻译必须结束于文章的一个大段落。
作为一名留学生，我有时也需要翻译一些学术类型的文献。所以，我有几款常用的英文学术文献类的翻译软件，下面就由我来分享几种英文学术文献的翻译软件。
01 DeepL
DeepL是我经常使用的英文学术文献翻译软件之一。这款翻译软件相对能够比较准确地翻译，同时它还会提供同义词供使用者参考。更重要的是，DeepL还能翻译整个文献，支持PDF，Word和PPT格式的文献，这就方便了很多。
用DeepL 翻译文献时，一些学术性的单词和语句都能翻译得比较自然。就像文献中常见的代词，该翻译软件能够准确翻译对应前面所说的名词，所以它能更贴近原文的意思。
02 Google translate
Google translate是最常见的翻译软件之一。我推荐这款翻译软件主要原因是它能够快速翻译出使用者所需要的文章或语句，这能节省一些时间。它还提供各种同义词，只要点击某个单词，下面就会出现多个同义词，所以这比较方便使用者替换单词。
我也常用Google translate来翻译文献。但我发现用这款翻译软件翻译整篇文献时，翻译出来的意思会与原文有一些出入，尤其体现在某个句子中。可我将整篇文献分拆几个段落来翻译，可以看到翻译得更贴近原文的意思。因此，建议读者可以通过一个大段落来翻译以保障准确度。
03 Copy translator
Copy translator翻译软件相对来说可能比较少人用，该软件只能下载安装使用，不像其他翻译软件能在线使用。对于Copy translator，它的好用之处在于它可以自动识别学术文献，同时自动删掉一些无用的符号。还有，在该翻译软件翻译整个文献，它能够保持本身的排版，这就更加方便使用者。
以上就是我向大家推荐的三种英文学术文献翻译软件，总的来说都是比较好用的。但实际还是会有出入，所以建议大家要适当使用。
桥式起重机是横架于车间、仓库和料场上空进行物料吊运的起重设备。由于它的两端坐落在高大的水泥柱或者金属支架上，形状似桥。桥式起重机的桥架沿铺设在两侧高架上的轨道纵向运行，可以充分利用桥架下面的空间吊运物料，不受地面设备的阻碍。它是使用范围最广、数量最多的一种起重机械。Bridge crane is horizontal plane in workshop, warehouse and yard over rigger materials of lifting equipment. Because of its ends located in tall cement posts or metal stents, shape like bridge. Bridge crane along the bridge on both sides laying in elevated the orbit of longitudinal operation, can make full use of the space below girder hoisting materials, does not suffer ground equipment obstacles. It is to use the widest range, the largest number of a kind of hoisting machinery. 桥式起重机是现代工业生产和起重运输中实现实现生产过程 机械化、自动化得重要工具和设备。 所以桥式起重机在室内外工矿企业、钢铁化工、铁路交通、港口码头以及物流周转等部门和场所均得到广泛的运用。Bridge crane is the modern industrial production and lifting transportation in realizing realize mechanization, automation production process to important tools and equipment. So bridge crane in interior industrial and mining enterprises, steel chemical industry, railway transportation, ports and logistics departments and establishments are widely used. 桥式起重机可分为普通桥式起重机、简易梁桥式起重机和冶金专用桥式起重机三种。 普通桥式起重机一般由起重小车、桥架运行机构、桥架金属结构组 成。起重小车又由起升机构、小车运行机构和小车架三部分组成。 起升机构包括电动机、制动器、减速器、卷筒和滑轮组。电动机通过减速器，带动卷筒转动，使钢丝绳绕上卷筒或从卷筒放下，以升降重物。小车架是支托和安装起升机构和小车运行机构等部件的机架，通常为焊接结构。 起重机运行机构的驱动方式可分为两大类：一类为集中驱动，即用一台电动机带动长传动轴驱动两边的主动车轮；另一类为分别驱动、即两边的主动车轮各用一台电动机驱动。中、小型桥式起重机较多采用制动器、减速器和电动机组合成一体的“三合一”驱动方式，大起重量的普通桥式起重机为便于安装和调整，驱动装置常采用万向联轴器。 起重机运行机构一般只用四个主动和从动车轮，如果起重量很大，常用增加车轮的办法来降低轮压。当车轮超过四个时，必须采用铰接均衡车架装置，使起重机的载荷均匀地分布在各车轮上。 桥架的金属结构由主梁和端梁组成，分为单主梁桥架和双梁桥架两类。单主梁桥架由单根主梁和位于跨度两边的端梁组成，双梁桥架由两根主梁和端梁组成。 主梁与端梁刚性连接，端梁两端装有车轮，用以支承桥架在高架上运行。主梁上焊有轨道，供起重小车运行。桥架主梁的结构类型较多比较典型的有箱形结构、四桁架结构和空腹桁架结构。 箱形结构又可分为正轨箱形双梁、偏轨箱形双梁、偏轨箱形单主梁等几种。正轨箱形双梁是广泛采用的一种基本形式，主梁由上、下翼缘板和两侧的垂直腹板组成，小车钢轨布置在上翼缘板的中心线上，它的结构简单，制造方便，适于成批生产，但自重较大。 偏轨箱形双梁和偏轨箱形单主梁的截面都是由上、下翼缘板和不等厚的主副腹板组成，小车钢轨布置在主腹板上方，箱体内的短加劲板可以省去，其中偏轨箱形单主梁是由一根宽翼缘箱形主梁代替两根主梁，自重较小，但制造较复杂。 四桁架式结构由四片平面桁架组合成封闭型空间结构，在上水平桁架表面一般铺有走台板，自重轻，刚度大，但与其他结构相比，外形尺寸大，制造较复杂，疲劳强度较低，已较少生产。 空腹桁架结构类似偏轨箱形主梁，由四片钢板组成一封闭结构，除主腹板为实腹工字形梁外，其余三片钢板上按照设计要求切割成许多窗口，形成一个无斜杆的空腹桁架，在上、下水平桁架表面铺有走台板，起重机运行机构及电气设备装在桥架内部，自重较轻，整体刚度大，这在中国是较为广泛采用的一种型式。 普通桥式起重机主要采用电力驱动，一般是在司机室内操纵，也有远距离 桥式起重机控制的。起重量可达五百吨，跨度可达60米。 Bridge crane can be divided into ordinary bridge crane, simple girder crane and metallurgical special bridge crane 3 kinds. Ordinary bridge crane is general by lifting trolley and bridge operation organization, bridge metal structure group into. Lifting car again by lifting mechanism, trolley mechanism and the car frame of three parts. Lifting mechanism including motor, brakes, reducer, drum and pulleys. Driving speed reducer, electromotor through reel rotation of wire rope around the drum drum down, or from lifting weights with. Car frame is a torre and installation of hoisting mechanism and the car mechanism, etc. Parts of the frame, usually for welding structure. Crane operation organization drive mode can be divided into two kinds: one kind is concentrated drive, which is a motor driving long shaft drive on both sides of the active wheels, Another kind is respectively driven, namely on both sides of the active wheel each with a motor drives. Medium and small bridge crane is increasingly used brakes, reducer and electric generator synthetic one of three-in-one drive mode, a big weight of ordinary bridge crane for ease of installation and adjustment, device drivers often adopt universal shaft coupling. Crane operation organization generally in four active and driven wheels, if lifting weight is very big, commonly used to increase the wheel to reduce the pulley. When more than four wheels when, must use hinged equilibrium frame device to make the crane load evenly distributed in each wheel. Bridge of metal structure composed by main girder and girders, divided into the single girder frame and main double girder frame two kinds. Single main girder bridge girder and frame is located in single span on both sides of the girders composition, double girder frame girder by two root and girders composition. Girder and girders rigid connection, girders, supporting both ends with wheels in elevated bridge to run on. The main welding have orbit, for lifting car running. Bridge girder structure type more comparatively typical have box structure, four truss structure and open-web truss structure. Box structure can divide again on track box shuang liang, slant rail box shuang liang, slant rail box single girder to wait for a few kinds. Track box shuang liang is widespread adoption of a basic form the girder, consists of flange plate and bilateral vertical webs composition, car rail decorate in the center of the flange plate online, its simple structure, easy fabrication, suitable for mass production, but self-respect greatly. Partial rail box double beam and partial rail box single main section is by the upper and lower flange plate and the different thickness of the Lord vice webs composition, car rail decorate in the main webs, short circuits inside above stiffening plate can save, including partial rail box girder is composed of a single root box girder wide flange instead of two root girder, respect smaller, but manufacturing complex. Four truss structure featured by four plane truss by combined into closing in on the spatial structure, the level of general shop to have walked surface truss bedplate, light dead weight, stiffness big, but compared with other structure size, shape, manufacturing is relatively complex, fatigue strength low, has less production. Open-web truss structure similar to slant box girder by rail, four plates form a closed structure, in addition to the main webs for real abdomen i-section beam outside, the rest 3-piece plate according to the design demand cutting into many window, forming a without rods of open-web truss, in the upper and lower horizontal truss surface covered go bedplate, crane operation organization and electrical equipment installed in bridge internal, self-respect lighter, whole stiffness big in China is that more widespread adoption of a type. Ordinary bridge crane mainly adopts electric drive, it is to be in commonly driver indoor manipulation, also have long-distance bridge crane Control. Lifting weight can reach 500 tons, span of 60 meters. 简易梁桥式起重机又称梁式起重机，其结构组成与普通桥式起重机类似，起重量、跨度和工作速度均较小。桥架主梁是由工字钢或其他型钢和板钢组成的简单截面梁，用手拉葫芦或电动葫芦配上简易小车作为起重小车，小车一般在工字梁的下翼缘上运行。桥架可以沿高架上的轨道运行，也可沿悬吊在高架下面的轨道运行，这种起重机称为悬挂梁式起重机。 冶金专用桥式起重机在钢铁生产过程中可参与特定的工艺操作，其基本结构与普通桥式起重机相似，但在起重小车上还装有特殊的工作机构或装置。这种起重机的工作特点是使用频繁、条件恶劣，工作级别较高。主要有五种类型。payments and plate steel composed of simple beam, with the hand type hoists or electric hoist match on simple car as lifting car, the car is in commonly strander beam under operation on the flange. Bridge along on a high orbits, also can along the suspensory on elevated the following orbits, this kind of crane beam cranes called suspension. Metallurgy special bridge crane in steel production process can participate in particular process operation, its basic structure and ordinary bridge crane is similar, but in lifting cars also has a special working organs or device. This kind of crane characteristics of the work is used frequently, conditions and job level is higher. Basically has five types. 桥式起重机的安全检查为了保证桥式起重机的安全运行，在起重机运行期间需进行一些安全常规检查，检查项目及要点如下： （1） 起升高度限位器、行程限位开关及各联锁机构性能正 桥式起重机常，安全可靠。 （2） 各主要零部件符合安全要求：开口增大小于原尺寸的15%，扭转变形小于10%；板钩衬套磨损小于原尺寸的50%，板钩心轴磨损小于5%，无剥落、毛刺、焊补。吊钩挂架及滑轮无明显缺陷。钢丝绳表面钢丝磨损、腐蚀量小于钢丝直径的40%，断丝在一个捻距内小于总丝数的10%，无断头，无明显变细，无芯部脱出、死角扭拧、挤压变形、退火、烧损现象。钢丝绳端部连接及固定的卡子、压板、锲块连接完好，无松动，压板不少于2个，卡子数量不少于3个。卷筒无裂纹，连接、固定无松动；筒壁磨损小于原壁厚的20%；安全卷不少于2圈，卷筒与钢丝绳直径比例符合要求。平衡轮固定完好，钢丝绳应符合的要求。制动器无裂纹，无松动，无严重磨损，制动间隙两侧相等尺寸合适，有足够的制动力，制动带磨损小于原厚度的50%。 通过对桥式起重机的安全常规检查，对杜绝人身事故，减少设备事故，提高设备运转率，降低检修费用等均起到了显著作用。Bridge crane safety check to ensure the safe operation of the bridge cranes, in crane operation period to some general safety inspections and inspection items and points as follows: (1) the hoisting height peneumatied device, travel limit switches and all the interlock device performance is bridge crane Often, safe and reliable. (2) the main parts meet safety requirements: less than the original size increase openings less than 10%, 15% torsional deformation, Board hook bushing wear less than the original size, 50% of the board hook mandrels wear less than 5%, no spalling, burr, weld repairs. Hook rack and pulley without obvious flaw. Wire rope surface wire wear and corrosion is less than 40% of wire diameter, broken wires in a twined within less than the total silk from the number of 10%, no bufo, without obvious attenuate, without mandrel department of emergence, blind Angle twisting, extrusion, annealing, burning phenomenon. At the end of the wire rope connection and fixed clip next, clips, -200 block connect intact, without loosing, linking piece not less than 2, clip next amount not less than 3. S no crack, links, fixed without shake, A hollow wear less than 20% of the original wall thickness, Safety coil not less than 2 laps, drum and wire rope diameter ratio meets the requirement. Balance wheel fixed intact, the wire rope should comply with the requirements. Brake flawless, without loose, no serious wear and brake clearance sides equal size, have enough braking force, brake with less than 50% of the original thickness wear. Through the bridge crane safety routine inspection, to prevent accidents and reduce equipment accidents and improve equipment availability, reducing maintenance cost etc are plays a remarkable role.
我当初写的是， 论简爱中的被动句翻译特色。我有个同学写的是你说的颜色， 不过她只写一中颜色就是红色的翻译。 论文切入口一定要小。
傲慢与偏见 这方面的英语论文是吧。可以帮到你 全英写作的 联系用户名
主要就是中英文摘要吧，正文应该不用哦。文献综述如果引用的是国外的，自己在正文中是引用翻译成中文的内容。
外文翻译是你上网上查询一篇文章，和你的设计题目相似的英文文章，然后自己翻译过来，这就是外文翻译，篇幅必须长一点，因为一般毕业设计都要有字数限制。文献综述一般就是把你所用到的资料都一一介绍一下，不要很具体，因为论文是文献综述的具体介绍，文献综述中还包括一些与设计题目有关的现实描述。
我有一篇我本科毕设的小论文，英文中文都有，而且是我人工翻译的，8000字左右。你要的话PM我。我是电气工程及其自动化专业的。《Analysis of thyristor-controlled phase shifter applied in damping power system oscillations》
Electric Power Systems 电力系统 The modern society depends on the electricity supply more heavily than ever before. 现代社会的电力供应依赖于更多地比以往任何时候。 It can not be imagined what the world should be if the electricity supply were interrupted all over the world. 它无法想象的世界应该是什么，如果电力供应中断了世界各地。 Electric power systems (or electric energy systems), providing electricity to the modern society, have become indispensable components of the industrial world. 电力系统（或电力能源系统），提供电力到现代社会，已成为不可缺少的组成部分产业界的。 The first complete electric power system (comprising a generator, cable, fuse, meter, and loads) was built by Thomas Edison – the historic Pearl Street Station in New York City which began operation in September 1882. 第一个完整的电力系统（包括发电机，电缆，熔断器，计量，并加载）的托马斯爱迪生所建-站纽约市珍珠街的历史始于1882年9月运作。 This was a DC system consisting of a steam-engine-driven DC generator supplying power to 59 customers within an area roughly 1.5 km in radius. The load, which consisted entirely of incandescent lamps, was supplied at 110 V through an underground cable system. 这是一个半径直流系统组成的一个蒸汽发动机驱动的直流发电机面积约1.5公里至59供电范围内的客户。负载，其中包括完全的白炽灯，为V提供110通过地下电缆系统。 Within a few years similar systems were in operation in most large cities throughout the world. With the development of motors by Frank Sprague in 1884, motor loads were added to such systems. This was the beginning of what would develop into one of the largest industries in the world. In spite of the initial widespread use of DC systems, they were almost completely superseded by AC systems. By 1886, the limitations of DC systems were becoming increasingly apparent. They could deliver power only a short distance from generators. 在一个类似的系统在大多数大城市在世界各地运行数年。随着马达的弗兰克斯普拉格发展在1884年，电机负载被添加到这些系统。这是什么开始发展成为世界上最大的产业之一。在最初的直流系统广泛使用尽管如此，他们几乎完全被空调系统所取代。到1886年，直流系统的局限性也日益明显。他们可以提供功率只有很短的距离从发电机。To keep transmission power losses ( I 2 R ) and voltage drops to acceptable levels, voltage levels had to be high for long-distance power transmission. Such high voltages were not acceptable for generation and consumption of power; therefore, a convenient means for voltage transformation became a necessity. 为了保持发射功率损失（我2 R）和电压下降到可接受的水平，电压等级，必须长途输电高。如此高的电压不发电和电力消耗可以接受的，因此，电压转换成为一个方便的手段的必要性。 The development of the transformer and AC transmission by L. Gaulard and JD Gibbs of Paris, France, led to AC electric power systems. 在发展的变压器，法国和交流输电由L.巴黎戈拉尔和JD吉布斯导致交流电力系统。 In 1889, the first AC transmission line in North America was put into operation in Oregon between Willamette Falls and Portland. 1889年，第一次在北美交流传输线将在俄勒冈州波特兰之间威拉梅特大瀑布和实施。It was a single-phase line transmitting power at 4,000 V over a distance of 21 km. With the development of polyphase systems by Nikola Tesla, the AC system became even more attractive. By 1888, Tesla held several patents on AC motors, generators, transformers, and transmission systems. Westinghouse bought the patents to these early inventions, and they formed the basis of the present-day AC systems.这是一个单相线路传输功率为4,000公里，超过21 V系统的距离。随着交流的发展多相系统由尼古拉特斯拉，成为更具吸引力的。通过1888年，特斯拉举行交流多项专利电动机，发电机，变压器和输电系统。西屋公司购买了这些早期的发明专利，并形成了系统的基础，现在的交流。 In the 1890s, there was considerable controversy over whether the electric utility industry should be standardized on DC or AC. By the turn of the century, the AC system had won out over the DC system for the following reasons: 在19世纪90年代，有很大的争议或交流电力行业是否应该统一于直流。到了世纪之交的，在交流系统赢得了原因出在下面的直流系统为： （1）Voltage levels can be easily transformed in AC systems, thus providing the flexibility for use of different voltages for generation, transmission, and consumption. （1）电压水平可以很容易地改变了空调系统，从而提供了传输的灵活性，发电用不同的电压和消费。 （2）AC generators are much simpler than DC generators. （2）交流发电机简单得多比直流发电机。 （3）AC motors are much simpler and cheaper than DC motors. （三）交流电机和电机便宜简单得多，比直流。 The first three-phase line in North America went into operation in 1893——a 2,300 V, 12 km line in southern California. 前三个阶段的美国北线投产于1893年- 1 2300五，南加州12公里路线研究。 In the early period of AC power transmission, frequency was not standardized. 在电力传输初期交流，频率不规范。 Many different frequencies were in use: 25, 50, 60, 125, and 133 Hz. 有许多不同频率的使用：25，50，60，125，和133赫兹。 This poses a problem for interconnection. Eventually 60 Hz was adopted as standard in North America, although 50 Hz was used in many other countries. 这对互连的问题。最后60赫兹标准获得通过，成为美国在北美，虽然是50赫兹在许多其他国家使用。 The increasing need for transmitting large amounts of power over longer distance created an incentive to use progressively high voltage levels. To avoid the proliferation of an unlimited number of voltages, the industry has standardized voltage levels. In USA, the standards are 115, 138, 161, and 230 kV for the high voltage (HV) class, and 345, 500 and 765 kV for the extra-high voltage (EHV) class. In China, the voltage levels in use are 10, 35, 110 for HV class, and 220, 330 (only in Northwest China) and 500 kV for EHV class . 较长的距离越来越需要大量的电力传输多激励他们逐步使用高压的水平。为了避免电压增殖数量无限，业界标准电压水平。在美国，标准是115，138， 161，和230千伏的高电压（高压）类，345，500和765千伏级的特高电压（超高压）。在中国，各级使用电压为10，35，110级高压， 220，中国330（仅在西北）和500千伏超高压类。The first 750 kVtransmission line will be built in the near future in Northwest China. 第一个750 kVtransmission线将建在不久的将来在中国西北地区。With the development of the AC/DC converting equipment, high voltage DC (HVDC) transmission systems have become more attractive and economical in special situations. 随着交流的发展/直流转换设备，高压直流高压直流（HVDC）传输系统已经成为更具吸引力的经济和情况特殊。 The HVDC transmission can be used for transmission of large blocks of power over long distance, and providing an asynchronous link between systems where AC interconnection would be impractical because of system stability consideration or because nominal frequencies of the systems are different. 在高压直流输电可用于输电块以上的大长途电话，并提供不同系统间的异步连接在AC联网系统将是不切实际的，因为稳定考虑，或因标称频率的系统。 The basic requirement to a power system is to provide an uninterrupted energy supply to customers with acceptable voltages and frequency. 基本要求到电源系统是提供一个不间断的能源供应，以客户可接受的电压和频率。 Because electricity can not be massively stored under a simple and economic way, the production and consumption of electricity must be done simultaneously. A fault or misoperation in any stages of a power system may possibly result in interruption of electricity supply to the customers. 由于电力无法大量储存在一个简单的方法和经济，电力的生产和消费必须同时进行。系统的故障或误操作的权力在任何阶段可能导致电力供应中断给客户。 Therefore, a normal continuous operation of the power system to provide a reliable power supply to the customers is of paramount importance. 因此，一个正常的电力系统连续运行的，提供可靠的电力供应给客户的重要性是至关重要的。 Power system stability may be broadly defined as the property of a power system that enables it to remain in a state of operating equilibrium under normal operating conditions and to regain an acceptable state of equilibrium after being subjected to a disturbance. 电力系统稳定，可广泛定义为干扰财产的权力系统，可继续经营的状态下正常运行的平衡条件和后向遭受恢复一个可以接受的平衡状态。 Instability in a power system may be manifested in many different ways depending on the system configuration and operating mode. 在电力系统的不稳定可能会表现在经营方式和多种不同的方式取决于系统配置。 Traditionally, the stability problem has been one of maintaining synchronous operation. Since power systems rely on synchronous machines for generation of electrical power, a necessary condition for satisfactory system operation is that all synchronous machines remain in synchronism or, colloquially "in step". This aspect of stability is influenced by the dynamics of generator rotor angles and power-angle relationships, and then referred to " rotor angle stability ". 传统上，稳定性问题一直是一个保持同步运行。由于电力系统的发电电力，一个令人满意的系统运行的必要条件是，依靠同步电机同步电机都留在同步或通俗的“步骤”。这一方面是受稳定的发电机转子的动态角度和功角的关系，然后提到“转子角稳定”。
我可以给你 +471903103 专业论文及翻译，还有CAD图形。
用于分布式在线UPS中的并联逆变器的一种无线控制器A Wireless Controller for Parallel Inverters in Distributed Online UPS SystemsJosep M. Guerrero', Luis Garcia de Vicufia", Jose Matas'*, Jaume Miret", and Miguel Castilla". Departament #Enginyeria de Sistemes, Automatica i Informhtica Industrial. Universitat Polithica de CatalunyaC. Comte d'Urgell, 187.08036 -Barcelona. Spain. Email: .. Departament #Enginyeria Electrbnica. Universitat Polit6cnica de CatalunyaAV. Victor BaLguer s/n. 08800I - Vilanova i la Geltrh. SpainAbsiract - In this paper, a novel controller for parallelconnectedonline-UPS inverters without control wireinterconnections is presented. The wireless control technique isbased on the well-known droop method, which consists inintroducing P-oand Q-V schemes into the inverters, in order toshare properly the power drawn to the loads. The droop methodhas been widely used in applications of load sharing betweendifferent parallel-connected inverters. However, this methodhas several drawbacks that limited its application, such as atrade-off between output-voltage regulation and power sharingaccuracy, slow transient response, and frequency and phasedeviation. This last disadvantage makes impracticable themethod in online-UPS systems, since in this case every modulemust be in phase with the utility ac mains. To overcome theselimitations, we propose a novel control scheme, endowing to theparalleled-UPS system a proper transient response, strictlyfrequency and phase synchronization with the ac mains, andexcellent power sharing. Simulation and experimental resultsare reported confirming the validity of the proposed approach.1. INTRODUCTIONThe parallel operation of distributed Uninterruptible PowerSupplies (UPS) is presented as a suitable solution to supplycritical and sensitive loads, when high reliability and poweravailability are required. In the last years, many controlschemes for parallel-connected inverters has been raised,which are derived from parallel-schemes of dc-dc converters[I], such as the master-slave control [2], or the democraticcontrol [3]. In contrast, novel control schemes have beenappeared recently, such as the chain-structure control [4], orthe distributed control [ 5 ] . However, all these schemes needcontrol interconnections between modules and, hence, thereliability of the system is reduced since they can be a sourceof noise and failures. Moreover, these communication wireslimited the physical situation ofthe modules [6].In this sense, several control techniques has been proposedwithout control interconnections, such as the droop method.In this method, the control loop achieves good power sharingmaking tight adjustments over the output voltage frequencyand amplitude of the inverter, with the objective tocompensate the active and reactive power unbalances [7].This concept is derived from the power system theory, inwhich the frequency of a generator drops when the powerdrawn to the utility line increases [8].0-7803-7906-3/03/$17.00 02003 IEEE. 1637However, this control approach has an inherent trade-offbetween voltage regulation and power sharing. In addition,this method exhibits slow dynamic-response, since it requireslow-pass filters to calculate the average value of the activeand reactive power. Hence, the stability and the dynamics ofthe whole system are hardly influenced by the characteristicsof these filters and by the value of the droop coefficients,which are bounded by the maximum allowed deviations ofthe output voltage amplitude and frequency.Besides, when active power increases, the droopcharacteristic causes a frequency deviation from the nominalvalue and, consequently, it results in a variable phasedifference between the mains and the inverter output voltage.This fact can be a problem when the bypass switch mustconnect the utility line directly to the critical bus in stead ofits phase difference. In [9], two possibilities are presented inorder to achieve phase synchronization for parallel lineinteractiveUPS systems. The first one is to locate a particularmodule near the bypass switch, which must to synchronizethe output voltage to the mains while supporting overloadcondition before switch on. The second possibility is to waitfor the instant when phase matching is produced to connectthe bypass.However, the mentioned two folds cannot be applied to aparallel online-UPS system, since maximum transfer timeought to be less than a % of line period, and all the modulesmust be always synchronized with the mains when it ispresent. Hence, the modules should be prepared to transferdirectly the energy from the mains to the critical bus in caseof overload or failure [lo].In our previous works [11][12], we proposed differentcontrol schemes to overcome several limitations of theconventional droop method. However, these controllers bythemselves are inappropriate to apply to a parallel online-UPS system. In this paper, a novel wireless control scheme isproposed to parallel different online UPS modules with highperformance and restricted requirements. The controllerprovides: 1) proper transient response; 2) power sharingaccuracy; 3) stable frequency operation; and 4) good phasematching between the output-voltage and the utility line.Thus, this new approach is especially suitable for paralleled-UPS systems with true redundancy, high reliability andpower availability. Simulation and experimental results arereported, confirming the validity of this control scheme.Fig. 1. Equivalenl cimuif ofan invener connecled 10 a bust"Fig. 2. P-odraop function.11. REVlEW OF THE CONVENTIONAL DROOP METHODFig. 1 shows the equivalent circuit of an inverter connectedto a common bus through coupled impedance. When thisimpedance is inductive, the active and reactive powers drawnto the load can be expressed asEVcosQ - V2 Q=where Xis the output reactance of an inverter; Q is the phaseangle between the output voltage of the inverter and thevoltage of the common bus; E and V are the amplitude of theoutput voltage of the inverter and the bus voltage,respectively.From the above equations it can be derived that the activepower P is predominately dependent on the power angle Q,while the reactive power Q mostly depends on the outputvoltageamplitude. Consequently, most of wireless-control ofparalleled-inverters uses the conventional droop method,which introduces the following droops in the amplitude Eand the frequency U of the inverter output voltageu = w -mP (3)E = E ' - n Q , (4)being W* and E' the output voltage frequency and amplitudeat no load, respectively; m and n are the droop coefficientsfor the frequency and amplitude, respectively.Furthermore, a coupled inductance is needed between theinverter output and the critical bus that fixes the outputimpedance, in order to ensure a proper power flow. However,it is bulky and increase:; the size and the cost of the UPSmodules. In addition, tho output voltage is highly distortedwhen supplying nonlinezr loads since the output impedanceis a pure inductance.It is well known that if droop coefficients are increased,then good power sharing is achieved at the expense ofdegrading the voltage regulation (see Fig. 2).The inherent trade-off of this scheme restricts thementioned coefficients, which can be a serious limitation interms of transient response, power sharing accuracy, andsystem stability.On the other hand, lo carry out the droop functions,expressed by (3) and (4), it is necessary to calculate theaverage value over one line-cycle of the output active andreactive instantaneous power. This can be implemented bymeans of low pass filters with a smaller bandwidth than thatof the closed-loop inverter. Consequently, the powercalculation filters and droop coefficients determine, to a largeextent, the dynamics and the stability of the paralleledinvertersystem [ 131.In conclusion, the droop method has several intrinsicproblems to be applied 1.0 a wireless paralleled-system ofonline UPS, which can he summed-up as follows:Static trade-off between the output-voltage regulation(frequency and amplitude) and the power-sharingaccuracy (active an4d reactive).2) Limited transient response. The system dynamicsdepends on the power-calculation filter characteristics,the droop coefficients, and the output impedances.Lost of ac mains synchronization. The frequency andphase deviations, due to the frequency droop, makeimpracticable this method to a parallel-connectedonline UPS system, in which every UPS should becontinuously synchronized to the public ac supply.1)3)111. PROPOSED CONTROL FOR PARALLEL ONLINE UPSINVERTERSIn this work, we will try to overcome the above limitationsand to synthesize a novel control strategy withoutcommunication wires that could be appropriate to highperformanceparalleled industrial UPS. The objective is toconnect online UPS inverters in parallel without usingcontrol interconnections. This kind of systems, also namedinverter-preferred, should be continuously synchronized tothe utility line. When an overload or an inverter failureoccurs, a static bypass switch may connect the input line tothe load, bypassing the inve:rter [14][15].Fig. 3 shows the general diagram of a distributed onlineUPS system. This system consists of two buses: the utilitybus, which is connected lo the public ac mains; and thesecure bus, connected to the distributed critical loads. Theinterface between these buses is based on a number of onlineUPS modules connected in parallel, which providescontinuously power to the: loads [16]. The UPS modulesinclude a rectifier, a set of batteries, an inverter, and a staticbypass switch.11638Q ac mainsutility busI I Ij distributed loads !Fig. 3. Online distributed UPS system.syposr /I 4(4Fig. 4. Operation modes of an online UPS.(a) Normal operation. (b) Bypass operation. (c) Mains failureThe main operation modes of a distributed online UPS1) Normal operation: The power flows to the load, fromthe utility through the distributed UPS units.2) Mains failure: When the public ac mains fails, theUPS inverters supply the power to the loads, from thebatteries, without disruption.Bypass operation: When an overload situation occurs,the bypass switch must connect the critical busdirectly to the ac mains, in order to guarantee thecontinuous supply of the loads, avoiding the damageof the UPS modules.For this reason, the output-voltage waveform should besynchronized to the mains, when this last is present.system are listed below (see Fig. 5):3)Nevertheless, as we state before, the conventional droopmethod can not satisfy the need for synchronization with theutility, due to the frequency variation of the inverters, whichprovokes a phase deviation.To obtain the required performance, we present a transientP-w droop without frequency-deviation in steady-state,proposed previously by OUT in [ 111w=o -mP (5)where is the active power signal without the dccomponent,which is done by. -I t -1sP= p ,( s + t - ' ) ( s + o , )being zthe time constant of the transient droop action.The transient droop function ensures a stable frequencyregulation under steady-state conditions, and 'at the sametime, achieves active power balance by adjusting thefrequency of the modules during a load transient. Besides, toadjust the phase of the modules we propose an additionalsynchronizing loop, yieldingo=w'-m%k,A$, (7)where A$ is the phase difference between the inverter and themains; and k, is the proportional constant of the frequencyadjust. The steady-state frequency reference w* can beobtained by measuring the utility line frequency.The second term of the previous equality trends to zero insteady state, leading tow = w' - k4($ -@'), (8)being $and $* the phase angles of the output voltage inverterand the utility mains, respectively.Taking into account that w = d $ / d t , we can obtain thenext differential equation, which is stable fork, positived$ *dt dt- + km$ = - + k,$' . (9)Thus, when phase difference increases, frequency willdecrease slightly and, hence, all :he UPS modules will besynchronized with the utility, while sharing the power drawnto the loads.IV. CONTROLLIEMRP LEMENTATIONFig. 5 depicts the block diagram of the proposedcontroller. The average active power P , without the dccomponent, can be obtained by means of multiplying theoutput voltage by the output current, and filtering the product........................................................................................io",.LSj'nchronirorion loop.......................................................................................Fig. 5. Block diagram of the proposed controller.using a band-pass filter. In a similar way, the averagereactive power is obtained, hut in this case the output-voltagemust be delayed 90 degrees, and using a low-pass filter.In order to adjust the output voltage frequency, equation(7) is implemented, which corresponds to the frequencymains drooped by two transient-terms: the transient activepower signal term; and the phase difference term, whichis added in order to synchronize the output voltage with theac mains, in a phase-locked loop (PLL) fashion. The outputvoltageamplitude is regulated by using the conventionaldroop method (4).Finally, the physical coupled inductance can be avoided byusing a virtual inductor [17]. This concept consists inemulated an inductance behavior, by drooping the outputvoltage proportionally to the time derivative of the outputcurrent. However, when supplying nonlinear loads, the highordercurrent-harmonics can increase too much the outputvoltageTHD. This can be easily solved by using a high-passfilter instead of a pure-derivative term of the output current,which is useful to share linear and nonlinear loads [I 1][12].Furthermore, the proper design of this output inductance canreduce, to a large extent, the unbalance line-impedanceimpact over the power sharing accuracy.v. SIMULATION AND EXPERIMENTARELS ULTSThe proposed control scheme, (4) and (7), was simulatedwith the parameters listed in Table 1 and the scheme shownin Fig. 6, for a two paralleled inverters system. Thecoefficients m, n, T, and kv were chosen to ensure stability,proper transient response and good phase matching. Fig. 7shows the waveforms of the frequency, circulating currents,phase difference between the modules and the utility line,and the evolution of the active and reactive powers. Note theexcellent synchronization between the modules and theACmiiinr 4 j. ...L...I.P...S...1... ..........................B...u...n...r.r..r..e..s... ................................... iFig. 6. Parallel operation oftwa online UPS modules,mains, and, at the same time, the good power sharingobtained. This characteristik let us to apply the controller tothe online UPS paralleled systems.Two I-kVA UPS modules were built and tested in order toshow the validity of the proposed approach. Each UPSinverter consisted of a single-phase IGBT full-bridge with aswitching frequency of 20 kHz and an LC output filter, withthe following parameters: 1. = 1 mH, C = 20 WF, Vi" = 400V,v, = 220 V, I50 Hz. The controllers of these inverters werebased on three loops: an inner current-loop, an outer PIcontroller that ensures voltage regulation, and the loadsharingcontroller, based on (4) and (7). The last controllerwas implemented by means of a TMS320LF2407A, fixedpoint40 MHz digital sigrial processor (DSP) from TexasInstruments (see Fig. 8), using the parameters listed in TableI. The DSP-controller also includes a PLL block in order tosynchronize the inverter with the common bus. When thisoccurs, the static bypass switch is tumed on, and the droopbasedcontrol is initiated.1640big 7 Wa\cfc)rms for twu.invencr, ;mnectcd in parallel. rpchrontred io Ihc ac mdnl.(a) Frequencics ufhoth UPS (b) Clrculattng currcni among modulcs. (CJ Phmc d!Nercn;: betucen ihc UPS a#>dth e ai mum(d) Ikiril uf the phze diNmncc (e) md (0 Activc and rcactlw pouerr "I ooih UPSNote that the iimc-acs arc deliheratcly JiNercni due in thc disiinct timuion*uni) ofthe \ inrblrr1641TABLEI.PARAMETEROSF THE PARALLELESDYS TEM.Filter Order I IFilter Cut-off Frequency I 0, I 10 I ragsFig. 8 shows the output-current transient response of theUPS inverters. First, the two UPS are operating in parallelwithout load. Notice that a small reactive current is circlingbetween the modules, due to the measurement mismatches.Then, a nonlinear load, with a crest factor of 3, is connectedsuddenly. This result shows the good dynamics and loadsharingof the paralleled system when sharing a nonlinearload.Fig. 8. Output current for the two paralleled UPS, during the connection of Bcommon nonlinear load with a crest factor of 3. (Axis-x: 20 mddiv. Axis-y:5 Mdiv.).VI. CONCLUSIONSIn this paper, a novel load-sharing controller for parallelconnectedonline UPS systems, was proposed. The controlleris based on the droop method, which avoids the use ofcontrol interconnections. In a sharp contrast with theconventional droop method, the controller presented is ableto keep the output-voltage frequency and phase strictlysynchronized with the utility ac mains, while maintaininggood load sharing for linear and nonlinear loads. This fact letus to extend the droop method to paralleled online UPS.On the other hand, the proposed controller emulates aspecial kind of impedance, avoiding the use of a physicalcoupled inductance. Th.e results reported here show theeffectiveness of the proposed approach.