电气节能设计论文文献英文

1工作原理距离保护 Distance relays use voltages and currents acquired at the relay location to calculate the apparent impedance of the line from relay point to the fault point.距离继电器的使用电压和电流后天在接力的位置来计算的表观阻抗线中继站的故障点。 The calcu- lated apparent impedance Z is compared with the set- ting impedance Zset to decide whether the fault is inter- nal or external.的计算， lated明显阻抗Z是同一套婷阻抗Zset决定是否断层间的信号或外部。 During normal operation, the apparent impedance is generally larger than the Zset.在正常操作期间，明显的阻抗一般大于Zset 。 If the apparent impedance is less than Zset, then it is concluded that a fault has probably occurred in the protected line.如果明显阻抗小于Zset ，那么得出的结论是有可能发生故障的保护线。 Under fault conditions, the distance relay energizes the circuits to trip relevant circuit breakers to isolate the faulted line from the rest of the system[8].故障条件下，距离继电器的电路注入行有关断路器隔离断行的其余部分系统[ 8 ] 。 shows the working principle of distance protection.图1显示的工作原理，距离保护。 The startup element starts protection devices or fault calculating programs when fault occurs in the pro- tected line.启动元件启动保护装置或过失计算程序发生故障时，在亲tected线。 The measuring element, which is the center of distance protection, calculates the line impedance between the fault point and relay point.测量元素，这是中心的距离保护，计算线路阻抗之间的故障点和中继点。 The time delay element determines different time delays according to the result of the measuring element.的时间延迟因素确定不同的时间延迟根据测量结果的因素。 The output element executes the decision of protection.输出内容的决定，执行保护。 2 Configuration of simulation system 2配置的仿真系统 The dynamic simulation system for distance protec- tion proposed in this paper is designed according to its working principle and elementary configuration.动态仿真系统的距离保护法本文提出的目的是根据其工作原理和基本配置。 As shown in , the simulation system is composed of electromagnetic transient computing module, PT & CT module, data reading module, U & I display module, startup module, Fourier algorithm module, phase selec- tion module, impedance computing module, impedance comparison module and so on.图2所示的仿真系统是由电磁暂态计算模块，印尼与CT模块，数据读取模块， ü ＆余显示模块，启动模块，傅氏算法模块，相选择法模块，阻抗计算模块，阻抗比较模块等。 In this closed-loop simu- lation, the relay trip signal is fed back to control the cir- cuit breaker of power system model.在这个闭环仿真，接力行程信号反馈给控制电路- cuit断路器的电力系统模型。 This closed-loop simulation approach has greatly enhanced the accuracy of simulation and made it possible to simulate the dynamic interactions between power systems and protection systems.这闭环模拟方法，大大提高模拟的准确性和使之能够模拟动态电力系统之间的相互作用和保护系统。 Fault transient computing based on PSB 故障暂态计算的基础上公安局 The PSB was designed to provide a modern design tool that will allow users to rapidly and easily build models that simulate power systems.公安局的目的是提供一个现代化的设计工具，允许用户迅速，方便地建立模型，模拟电力系统。 The blockset uses the Simulink environment, allowing a model to be built using simple click and drag procedures.该模块利用Simulink环境下，允许的模式是采用简单的按一下并拖曳程序。 The libraries contain models of typical power equipment, such as transformers, lines, machines, and power electronics.该库包含型号的典型功耗设备，如变压器，线路，机器，电力电子技术。 These model's validity is based on the experience of the Power Systems Testing and Simulation Laboratory of Hydro-Québec, a large North American utility located in Canada.这些模型的有效性是基于经验，电力系统测试和模拟实验室水电魁北克，大型北美实用设在加拿大。 Matlab and its time domain solver Simulink create a friendly and open system.基于Matlab和Simulink的时域求解创建一个友好和开放的系统。 New models and libraries of power equipments may just be added to this package.新的模式和图书馆的电力设备可能会被添加到该程序包。 In this developing environment, we can finish all kinds of power system simulations[5—7]在此开发环境，我们可以完成各种各样的电力系统仿真[ 5-7 ]

Control of Parallel Inverters in Distributed AC Power Systems with Consideration of Line Impedance Effect在分布式交流电力系统中考虑连线阻抗影响时的并联逆变器控制 论文发到你的邮箱了

[1] Corrêa, J., Farret F., Canha L.,et al. An electrochemical-based fuel-cell model suitable for electrical engineering automation approach [J]. IEEE Transactions on industrial electronics. 2004, 51(5): 1103-1112.[2] wider, J., Michalski P.,Wszo ek G. Laboratory support for the didactic process of engineering processes automation at the Faculty of Mechanical Engineering [J]. Journal of Achievements in Materials and Manufacturing Engineering. 2006, 15(1-2): 199-206.给你找了两篇算是沾边文献。第一篇是电气化顶级期刊IEEE文献，被引用过100多次。第二篇被引用过十次。应该适合楼主。如果需要全文可以发邮件到另本人利用业余时间在百度知道里免费给网友查专业文献，纯属业余爱好，发的文献无存稿，请无关人员勿骚扰。

电气工程：1Electrical Engineering My decision to pursue graduate study in the United States is underscored by my desire to be a part of the graduate program at your institution. Purdue University offers the flexibility needed for such a vast and rapidly changing field. The research facilities and the faculty at the university are par excellent. Communications is an industry that has changed our lives. In a very short period it has changed the way we have looked at things since centuries. It is one industry that is going to shape our future for centuries to come. Hence my desire to do masters in electrical engineering with communications as my major. My interest in electronics blossomed during my high school years. It was the time when technology had begun to make an impact on the lives of people in India. Hence engineering with electronics as my major was the first choice for my undergraduate studies. Right since the beginning of my undergraduate study electronics is a subject that has fascinated me with its power of applications. The subjects that I have studied include Linear Electronics, Digital Electronics. These laid the foundation for my courses in Electronic Communication & Communication Systems at a later stage. My undergraduate studies already focus on the communications aspect of electronics. A masters degree in electrical engineering with communications as major field is the next logical step. For the past four months I have been working as a project trainee at the Indian Institute for Advanced Electronics. I am working on the design and development of a "PC Controlled Digital Serial Data Generator". This short stint has given me invaluable practical experience. It has given me the confidence to pursue a masters degree and also kindled a desire to do research. During the course of my work at IIAE, I have come across several scientists. Most of them work in different areas of communications. Interactions with them have made me realize the vastness and the scope of communications. My discussions with them convinced me that specializing in communications will suit me very well. The subject of research which interests me very much is spread spectrum communication systems. Coding theory and combinations is another research subject which arouses my curiosity. The subject Communication Theory which I am studying at present introduces these topics in theory. I am eager to find out more about the applications of coding theory to spread spectrum communication systems. In addition I have been a student member of the IEEE (Institute of Electrical and Electronics Engineers, Inc.) for the past three years. Through its workshops/seminars and publications like the 'The Spectrum' it has exposed me to a lot of emerging technologies in the field of communications. It is a strong belief in my family that the American education system has the best to offer in the whole world. This belief arises out of the experience that my parents had when they did their Masters of Science in the University of Pennsylvania during the years 1967-69. If I can get an opportunity to be a part of that intellectually stimulating environment, I am sure my talents will be put to optimal use. India is a developing country with an enormous potential in the information technology business. To serve the needs of this developing industry and more important its vast population, communications is going to become of utmost importance. Thus conditions here are very conducive to supplement my aspirations when I return after completing my graduate studies. 2Electrical Engineering As a graduate student, I will undertake research and coursework in Electrical Engineering to enhance my competencies in this field. I intend to complete my master's degree in order to pursue my doctorate. The research that I am most interested in pursuing at Northeastern University surrounds the optical properties of MEMS devices, and the development of substrate-based fast electro-optical interfaces. My interest in this area stems from my undergraduate study in MEMs development for tri-axial accelerometers. Engineering has been a key interest of mine since childhood. While still in grade school I enjoyed listening to my father, an electrical engineer, teach me about advances in technology, and was always eager to hear more. I was introduced to my first computer at the age of five, and have loved interacting with them ever since. My decision to study engineering as a career was no surprise to those who knew me. In college I found that I was always studying something I enjoyed. I believe it is because I enjoy my life and my work that I have been successful. Spending hours in the laboratory is not something that I dread, but instead I take pride in my work and its successful completion. One example of this that is still fresh in my mind is the successful design of a fully functional microprocessor in the Xilinx environment. All told, the project took over 150 hours of each design-team member's time. However, I did not look on it as a drain, but an experience for learning and a focus for my professional and technical development. When we finished the project we felt the sense of worth and pride in completion of a task that was once above our level of knowledge. Pursuing a graduate degree in the research field I have chosen also feels like a challenge, and I know that study will frustrate me at times. However, I feel that my commitment to learning will not be swayed. I feel confident in my ability to be creative in my perspective, and to persevere. My ultimate goal is to be an innovator in the field I have chosen to study. Professionalism and creativity are my most valued strengths. At the heart of my interest is the advancement of man in concert with his environment. My personal philosophy of life will matter greatly during my study and after its completion. That is why I devote time to reflection on my goals and their implications. Money has never been a motivator for my work, nor do I think it will be in the future. However, as a professional and a graduate, I realize that my earning potential will be significant. That is why I also commit myself to charity and fairness. In the past I have been a member of the Boy Scouts of America, and have achieved the rank of Eagle Scout. In the course of my experience in that organization, I learned respect and moral value. Now, as a member of the IEEE, I value my professional standing and its commensurate moral implications. Ethics in engineering is as important as technical skill, and as such I intend to uphold my own ethical obligations to the best of my ability. As a Northeastern University student, I would commit all that I have to offer to my study. I intend to pursue research in MEMS technology. At Rowan University as an undergraduate student I have already conducted some research and development of MEMS sensors for military applications, resulting in publication. An article, written by myself and my project member David Bowen and edited by our advisor Dr. Robert Krchnavek, was published in the NAVSEA Intelligent Ships Symposium Proceedings of 2001. The paper was titled "Designing a 3-Axis, Monolithic, MEMS-Based Accelerometer" and was under review for endorsement by the US Navy's NAVSEA facility in Philadelphia during that year. Building on my past success in MEMs design, I hope to advance my understanding. Through research at the graduate level, it is my hope to become familiar with, and innovate the design of MEMs Optics in hopes of creating a reliable and practical MEMs Electro-Optical Interface for use in consumer electronics. It is my hope, that through my research, optical waveguides for intradevice communication might be realized. Finally, my intent to pursue graduate study is laid plain. Study of MEMs optics is my intended focus, and I am committed to my goal. In pursuing a doctoral degree, I have closely analyzed myself to determine the reasons for my previous successes and my goals for the future. I have found that I do and have always enjoyed engineering, and that I have a strong desire to pursue my study further. I am prepared to commit myself to that study, and achieve what I have set out to do. 3I Wish to Pursue an MS Degree in Electrical Engineering During my senior year at Purdue University, I made a decision that has impacted the entire course of my education. While my classmates were making definite decisions about their career paths, I chose to implement a five-year plan of development and growth for myself. I designed this plan in order to examine various careers that I thought might interest me, as well as to expand upon my abilities at the time. As I was attaining a BS degree in Electrical Engineering, I decided to focus primarily on fields related to the VLSI (Very Large-Scale Integrated) circuits area. My main goals were either to gain work experience or to further my education by pursuing an MS degree in Electrical Engineering (MSEE). I saw an opportunity to both work and learn through employment at Xilinx Inc. Operating as a product engineer at a successful, high-tech semiconductor company has enabled me to utilize my technical and interpersonal skills in new and challenging ways. The position has also allowed me to interact with a multitude of departments including marketing, integrated circuit (IC) design, software/CAD development, manufacturing, reliability, accounting, and sales. I thus have gained an array of experience that extended beyond the parameters of my own responsibilities. In the workplace, I rely heavily upon the interpersonal techniques I developed as a counselor in a Purdue residence hall, as well as the organizational skills I had acquired through holding various leadership positions in cultural and engineering societies. I have also cultivated an interest in high-technology marketing that has continued to grow throughout my career. My experiences with Xilinx have heightened my hunger for knowledge in the VLSI field. Two months after joining the corporation, I applied to several part-time programs in the vicinity that would allow me to acquire an MSEE degree within two to three years. San Jose State seemed an ideal choice, for its evening MSEE courses would allow me to pursue two independent, full-time positions concurrently. The San Jose program has complimented my Xilinx duties well; both demand large levels of energy and enthusiasm while guiding me to my ultimate goal a high degree of education in VLSI sciences. The resources that I poured into both endeavors have reaped many gains. I have been promoted to a Product-Yield Engineering position within Xilinx's Coarse Grain Static Memory (CGSM) Product Engineering division. My extensive coursework plays a key role in my continued success at Xilinx. Relevant classes in advanced digital and analog VLSI design, as well as sub-micron ULSI technology, have allowed me to understand more completely the workings of Xilinx, a fab-less semiconductor company that also functions as a software and hardware design, testing, and marketing center. The gains in knowledge I have made through the combination of work experience and education have indeed been exponential. The academic records of my senior year at Purdue, coupled with my MSEE coursework, are ample proof of my dedication to learning. I feel I have overcome through hard work and dedication the brief "dry phase" I underwent at Purdue during the close of my sophomore and the first semester of my junior years. My performance at that time is in no way indicative of my usual achievements; they are instead the result of urgent family difficulties that required much foreign travel and serious attention to resolve. In May, I shall graduate with an MSEE degree from San Jose well ahead of my original estimates. This early graduation with Dean's Honors is the result of my firm belief in the value of diligence, as well as my renewed determination to strive for perfection in both work and school. I am now embarking on another five-year plan, during which I hope to fulfill several specific career goals. For instance, being part of a very dynamic and results-oriented Yield team at Xilinx calls for continuous development of computational and statistical techniques. The Yield team is divided to focus on specific process/fabrication issues and process (manufacturing) optimization. My own position is an integral part of the optimization group. Speed and cost issues continue to press high technology atmospheres towards optimization, probability and stochastic processes and systems, and rigorous simulations of mathematical models. The MS in EES&OR offered at your university will grant me the statistical knowledge that is crucial for process and production optimization in a fab-less environment. In addition, product engineering requires fundamental research on mathematical models for linear and non-linear programming, as well as the utilization of efficient computer software. I continuously employ the knowledge I gained at Purdue in Operations Research and advanced mathematics courses. Yet despite the value of these classes and my high performance in them, I now require further education to best fulfill my duties. An MS in the EES&OR field, will give me knowledge that is invaluable to a career in product development, project management and strategic planning. The program will allow me to improve decision-making skills in operations, strategy, and policy issues. I will strengthen my theory and application in countless areas:continuous, discrete, numerical optimization; probabilistic and stochastic processes; dynamic systems and simulation; economics, finance, and investment; decision analysis; dynamic programming and planning under uncertainty; operations and service; corporate and individual strategy; and private and public policy , the EES&OR program will not only help me to excel at Xilinx but will also further any future career. My commitment to work and education over the last three years proves that I will pursue this MS with enthusiasm and technical edge that the MS would provide is I will be working while attending Stanford, I shall mingle education with practical application, and bring to the table interesting problems from my experience and past education. Technical challenges encountered through projects in the EES&OR program will provide motivation and opportunity for methodological data collection, processing and presentation issues presented are integral to my future goals, and the management challenges raised will provide invaluable experience for professional practice. This will in turn build a solid foundation for a life-long career that can overcome any problem in decision-making. In addition, taking courses in economics, finance, and investment analysis will allow much growth of knowledge in investment issues in different industries. The EES&OR program thus appeals not only to my engineering, economics, science and mathematical background, but will compliment my technical abilities with the conceptual frameworks needed to analyze problems in operations, production, strategic planning, and marketing in the realm of emiconductor/IC/engineering systems. I feel that I am prepared to meet the challenges of the curriculum. My coursework in intermediate microeconomics and macroeconomics, international trade, operations research, linear algebra, and probabilistic methods, along with my extensive calculus background, will allow me to function well within the program. My long-term career goals include a move into marketing and product management. I believe that attaining this MS degree is the cornerstone to achieving my goals. It will give me the academic background necessary to succeed in product development, project management, and strategic planning. It will improve decision-making skills necessary for optimizing performance. The integration of two excellent programs in Economics Systems and Operations Research thus suits my current position and ties in with future goals perfectly by improving decision making in operations, strategy and policy. At present I desire to continue at Xilinx; attending a program that provides the flexibility and convenience of the SITN, is therefore imperative. Hence, being at Stanford as an HCP student alsoattracts me. I believe that Stanford is the best environment for me to achieve my goals while gaining exposure to and experience with a diverse student body and faculty. It is my belief that one continues to learn throughout one's life, and the most effective method of learning is through interaction with 's diversity offers an environment for learning, both inside and outside the classroom. I hope to share my varied knowledge with my classmates and to take from them a new understanding of topics that are foreign to me. I believe that no other school provides students with the combination of education and environment offered by Stanford. Its outstanding academic reputation, mingled with its diverse environment and thriving Bay Area location, creates an opportunity for growth that is second to none. I have many ambitions for myself as I embark on this stage of my life. I believe that an education from Stanford will provide invaluable experiences and skills that will allow me to become a successful and innovative business leader in the new millennium. 4Research Department of Biomedical Engineering is designed to research on and solve the bio-electrical and biomagnetic engineering problems in the field of biology and medicine with the aid of engineering principles and methods. Its main task is to explain, from perspective view of engineering, the biological and pathologic processes of the living organisms, especially human beings, and research on and develop the related medical devices and life science devices. Its research directions mainly include the modeling and emulation of the biological system, testing and analysis of biomedical signals, the biomedical imaging and processing , the biological effects of electromagnetic field and the development of artificial organs and medical devices, Bioengineering With the development and integration of electromagnetism, biology and medicine, biological electromagnetism exercises more and more influence on human life and health, environment protection and biological engineering. The research on electromagnetic bioengineering is a new research direction for IEECAS, mainly including research on rules of mutual influence between electromagnetic field and life matter, biological electromagnetic effect and its application in biology, medicine and medical equipment. At present, the research team has set up labs such as biological electromagnetic environment lab, biological electromagnetic signals & electromagnetic property testing lab, electromagnetic biological effect testing lab and biological electromagnetic simulation lab. It is equipped with various electrical and magnetic fields for experiments of biological electromagnetic effects, simulation software and biochemical experiment equipment. With such equipments, it can do biological electromagnetic experiments on live animals and detached live cells, detect, analyze and process the very weak biological electromagnetic signals, analyze and test live organism or detached cell under electromagnetic interaction with biochemical quantitative methods. The recent research work focuses on the effects 方向对不对，不知你要哪种，告诉我，我再接着找多的话email you

1系统的工作原理,距离保护 距离继电器使用电压和电流继电器位置购入的计算出明显的阻抗继电器点故障点。草拟的液压- Z是比较明显的阻抗匹配阻抗Zset街的设置,来决定是否故障是国际米兰- nal或外部。在正常运行过程中通常是明显的阻抗大于Zset。如果有明显的阻抗比Zset,然后得出错误可能发生在受保护的线。故障,距离传递给线路断路器行程相关的隔离断裂线与其他系统[8]。 图一显示了距离保护系统的工作原理。启动元素开始保护装置或故障计算程序中出现故障时tected亲。测量元件,它的中心距离保护,计算出了故障线路阻抗之间的观点和传递。延时单元决定了不同的时间延迟的结果表明测量元件。输出单元实行决策的保护。 2配置的仿真系统 动态仿真系统的特点,提出了在距离布鲁泰克-兴文章根据其工作原理、基本结构。在图2所示,仿真系统是由电磁暂态计算模块、玻璃纸、CT模块、数据的读取模块,你和我显示模块、启动模块、傅里叶算法模块、相selec -兴模块、阻抗计算模块、阻抗比较模块等。在这个闭环仿真试中的实现形式-螺旋桨,传递之旅信号反馈到控制有关的电力系统cuit——模型。这个闭环仿真方法大大提高了精度仿真模拟,使电力系统的动态互动和保护系统。 故障暂态计算基于寻求帮助 这个PSB用于提供现代设计工具,让用户快速并且容易建立数学模型,模拟电源系统。利用Simulink环境的仿真模型,使得建使用简单的点击并拖动的程序。 这个库包含了模型的典型的电力设备,诸如变压器、线条、机械、电力电子学。这些模型的有效性是基于经验的电力系统的测试和仿真实验室Hydro-Quebec、大量的北美效用位于加拿大。 Matlab的时域求解Simulink和它为你创造一个友好、开放的系统。新模式和图书馆的电力设备可能只是被添加到这个包裹。在这个发展环境,我们就能完成各种电力系统仿真[5 - 7]

具有良好的身体素质、职业道德和人文素质，较强的语言文字表达能力和一定的社会交往能力及继续学习能力。 具有较强的用英语进行人际和人机交流能力，具有阅读和翻译本专业有关英文资料的能力。

Electric Automation 电气自动化ELECTRIC AUTOMATION DEVICE AND METHOD FOR ADJUSTING THE FUNCTIONS OF THE ELECTRIC AUTOMATION DEVICE The invention relates to an electric automation device comprising a control unit that is controlled by a computer. In order to create an automation device that can be set to predefined functions in a particularly flexible manner while requiring less testing, a computer hardware component (2) is provided with control software comprising a basic functional area which includes an operating system (3), a device driver (4), and communication modules (5) so as to form a basic automation device (1) while the basic automation device (1) is complemented with any application modules (7a, 7b, 7c, 8, 9) that can be connected to the basic functional area via a software interface (6) in order to obtain the automation device. The invention also relates to a method for producing or adjusting the functions of such an electric automation device. 电气自动化专业介绍一、专业概况 随着高新技术的发展和生产自动化程度的提高，我国国民经济发展，正在和继续需要大批技术应用型实用人才。电气自动化技术是现代制造技术中不可缺少的重要技术门类，也是一个国家科技实力乃至综合竞争力的综合反映，在工业发展中具有前导地位。电气自动化技术，集机、电、计算机、信息处理等多学科于一体，是多学科相互交叉、渗透、结系淖酆涎Э疲�诠�窬�媒ㄉ柚姓加兄匾�牡匚弧R虼耍�梢运档缙�远��际跏嵌ヌ炝⒌氐氖乱担�枪�窬�梅⒄购腿嗣裆�钏�教岣叩奈镏侍跫�� ?br> （一）、培养目标本专业培养德、智、体、美、劳全面发展，具有良好职业道德和综合业务素质，具备较强的创新意识和创业能力，掌握电气自动化技术、计算机控制技术的基础理论，能在生产、建设、管理、服务第一线从事常用电气自动化设备、常用电气设备、供配电系统和装置、计算机控制系统、PLC控制系统的安装、调试、运行和维护的实用型高技能专门人才。 （二）、培养要求及职业能力分析 1、培养要求：本专业主要学习电气自动化的专业技术知识，应具有较强的本专业技术应用能力。 2、职业能力分析 （1）具有良好的身体素质、职业道德和人文素质，较强的语言文字表达能力和一定的社会交往能力及继续学习能力。 （2）具有较强的用英语进行人际和人机交流能力，具有阅读和翻译本专业有关英文资料的能力。 （3）具有较强的在信息化社会中工作、学习、生活所必备的计算机应用能力；熟练使用电子电气CAD软件；掌握一门程序设计语言。 （4）具有分析和测试常见的电工电子线路，能设计一般电工电子应用线路，能熟练使用常规电工电子仪器、仪表，具有熟练的电工基本操作技能。 （5）熟悉常用低压电器的基本原理及使用；能熟练阅读电气控制线路的原理图与接线图；具有对常规电气设备、供配电设备等电气控制系统进行安装、调试、维护能力。 （6）具有正确选用、安装、调试、维护电力电子装置和典型交、直流调速系统的能力。 （7）具有熟练的可编程控制器应用能力。 （8）具有以嵌入式计算机数字控制技术为核心的新技术基本应用能力，对相应控制系统具有调试维护能力。 （9）具有对一般的机械零件图、产品装配图与机械、液压和气压传动系统回路的识读能力，了解常用机械设备的结构特点及工艺过程，了解常见的机械和电气的配合关系。 （10）了解企业管理的基本知识，具有一定的质量意识。 （三）、课程设置 课程设置共分五部分：公共必修课、专业必修课、专业限定选修课、专业选修课及公共选修课。 1、公共必修课包括：思想道德修养、法律基础、邓小平理论、马克思主义哲学、体育、英语、高等数学、计算机操作基础等。 2、专业必修课包括：电工基础、模拟电子技术、数字电子技术、电机及拖动基础、机械制图及公差、机械工程基础、嵌入式计算机原理及应用、C语言程序设计、自动检测与转换技术、现代电力电子技术、可编程序控制器应用、自动控制原理与系统、C语言、工厂电气控制技术、电子电气CAD、变配电技术、变频调速原理与应用、工业控制网络、DSP原理与应用及专业英语等。其中主干课程为：电工基础、模拟电子技术、数字电子技术、电机及拖动基础、嵌入式计算机原理及应用、自动检测与转换技术、现代电力电子技术、可编程序控制器应用、自动控制原理与系统等。 3、专业限选课包括：计算机控制技术、工业自动化仪表、控制电机、智能控制等。 4专业任选课包括：电工电子工艺、多媒体技术、楼宇自动化、计算机系统仿真、计算机维修、程序设计（VB）等。 5、公共选修课包括：包括两个能力模块：经济管理科学类和人文与社会科学类。 （四）、实践教学环节 1、专业主要实践教学包括：电工实验、模拟电子技术实验、数字电子技术实验、电机与电力拖动实验、可编程序控制器应用实验、嵌入式计算机原理实验、现代电力电子技术实验、电工基础课程设计、电子技术课程设计、嵌入式计算机原理课程设计、可编程序控制器应用课程设计、自控系统课程设计、综合系统实训、金工实习、电工电子实习、专业参观、综合生产实习、毕业设计等。 2、非专业实践教学包括：入学教育、军训、暑期社会实践、社团活动、体育活动、文艺活动等。 （五）、职业技能证书 本专业证书包含三个方面： 1、公共必修证书：PET、计算机一级证书。 2、专业必修证书：CAD初级、维修电工中级。 3、任选证书：CET四级证书、计算机三级证书(单片机方向）、CAD中级证书、维修电工高级证书、气液电控制技术。 （六）、本专业师资力量 学院拥有一支学术造诣高、教学经验丰富、实践能力强的师资队伍。电气自动化技术专业现有师资26人，其中副高职称以上有17人，“双师型”教师10人。能够满足公共基础课、专业基础课和专业课的理论及实践教学的需要。 二、职业前景 1、对口行业 电气自动化技术是传统而具有新内涵的专业，本专业培养拥护党的基本路线，德、智、体、美等全面发展，具备从事电气自动化技术所需要的理论知识和职业技术能力，主要在生产、建设、服务和管理等第一线工作的高级技术应用性专门人才。本专业的毕业生可就职于国防、航天、航空、航海、铁道、机械、轻工、化工、电子、电力、电信、钢铁、石油、矿山、煤炭、地质、勘测等广泛的工业、农业、科学研究领域，也可就职于现代物流及现代服务业。 2、就业前景 在上海市经济委员会的《上海制造业战略升级的行动纲要》中指出：加快推动制造业的战略升级是贯彻党的十六大精神，坚定地走新型工业化道路，实现向制造业强国转变的国家战略需要，也是上海建立新型产业体系，提高城市综合竞争力，坚持“四个中心”的客观要求。上海制造业战略升级的重点包括：高新技术产业重点发展电子信息和现代生物与现代医药制造业；交通运输设备制造业重点发展汽车、轨道交通、船舶、民用飞机；装备制造业重点发展大型成套设备、电站设备、新能源和新型环保设备制造业；原材料制造业重点发展石油化工和精细化工、精品钢材制造业；生产性服务业重点发展制造业物流、技术服务等产业；大力发展就业广、清洁型的都市型工业。根据电气自动化的内涵，上述产业无不包含电气自动化技术，同时也对电气自动化技术专业的人才提出了更高的要求。据上海市政府组织的《面向新世纪上海紧缺人才需求趋势与开发研究对策》的报告显示，复合型技术人才是紧缺的专业人才，而电气自动化技术专业是培养复合型技术人才的有效载体。可以预见在未来数年内，电气自动化专业毕业生就业前景良好。

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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, -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 . 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 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/$ 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 , 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 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 , 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 , 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 . 1. Equivalenl cimuif ofan invener connecled 10 a bust"Fig. 2. P-odraop . 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, 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, , 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 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 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 [ conclusion, the droop method has several intrinsicproblems to be applied 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 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 )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 ac mainsutility busI I Ij distributed loads !Fig. 3. Online distributed UPS /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 ) Mains failure: When the public ac mains fails, theUPS inverters supply the power to the loads, from thebatteries, without 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 this reason, the output-voltage waveform should besynchronized to the mains, when this last is 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 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 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 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, 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 . 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 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 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 . 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...... ..........................B...u...n...... ................................... 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 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 7 Wa\cfc)rms for , ;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 \ THE PARALLELESDYS 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 , 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 . 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 the other hand, the proposed controller emulates aspecial kind of impedance, avoiding the use of a physicalcoupled inductance. results reported here show theeffectiveness of the proposed approach.