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 In spite of the initial widespread use of DC systems, they were almost completely superseded by AC systems.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”。
在本文中显示的数字均盒装曲线实验结果并没有盒装曲线从建模预测。boxed：1.将装箱的2.有栏线的排版3.被测谎过的4.对象或封箱no boxed：没有盒装
我是电气自动化的，有专业英语！这个给你看看希望能帮到你！电力和电路的来源One of them is the electric cell, or battery, which generates electricity by chemical action. The other device called generator makes use of light, heat, and mechanical motion to produce electric energy. Now, more than 95 percent of the world's electric energy is produced by generators其中之一是由化学作用产生电力的电池的电的单元格。调用生成器使其他设备使用的光、 热和机械的运动来产生电能。现在，世界电力能源的 95%以上是由发电机产生的An electric current is a constant flow of electrons through a conductor. The reason why an electric current flows through conductors is much like reason why water flows through mains. 源源不断地通过导体电子的电流。为什么电流流经导线的原因很多像为什么水流通过水管的原因。智能机器人An entirely new phase in robotic applications has been opened with the development of “intelligent robots”. An intelligent robot is basically one that must be capable of sensing its surroundings and possess intelligence enough to respond to a changing environment in much the same way as we do. Such an ability requires the direct application of sensory perception and artificial intelligence. Much of research in robotics has been and is still concerned with how to equip robots with visual sensors-eyes and tactile sensors-the “fingers”. Artificial intelligence will enable the robot to respond to and adapt to changes in its tasks and in its environment, and to reason and make decisions in reaction to those changes.一个全新的阶段，在机器人的应用程序中已打开的"智能机器人"发展。一个智能机器人基本上是一种必须能够感知周围的环境并拥有足够的智能响应不断变化的环境一样，我们做的。这种能力需要感官知觉与人工智能技术直接的应用。多机器人的研究一直，仍然关注如何使机器人视觉传感器眼睛和触觉传感器在"手指"。人工智能技术将使机器人响应和适应其任务和它的环境变化的原因和反应对这些变化做出的决定。Integrated circuit集成电路The invention of IC is a great revolution in the electronic industry. Sharp size, weight reductions are possible with these techniques; and more importantly, high reliability, excellent functional performance, now cost and low power dissipation can be achieved. ICs are widely used in electronic industry.集成电路的发明是大革命在电子工业中。锋利的大小重量减少有可能与这些技术 ；和更重要的是现在成本的优良性能的高可靠性和可以实现低功耗。集成电路 广泛应用于电子行业。The electrically interconnected components that make up an IC are called integrated elements. If an integrated circuit includes only one type of components, such as only diodes or resistors, it is said to be an assembly or set of components.芯片组成的电互连的组件称为集成的元素。如果一个集成电路包含一种类型如仅二极管或电阻的组件的据说是一个程序集或一组组件。Digital integrated circuit can contain anything form a few thousand to millions of logic gates, flip-flops, multiplexers, and other circuits in a few square millimeters. These digital ICs, typically microprocessors, digital signal processing, and micro controllers work using binary mathematics to process “one” and “zero” signals.数字集成电路可以包含任何内容形成数千数以百万计的逻辑门、 触发器、 多路复用器和其他线路的几个平方毫米。这些数字集成电路、 通常微处理器、 数字信号处理和微控制器工作使用二进制的数学处理"1"和"零"的信号。SIM Card Want to use your GSM service in the United States? Bring along this tiny piece of luggage.If you’re traveling to the United States, be sure to take your SIM card with you. Because your GSM service can work in the U.S. just like it dose at home.All you have to do is to rent the right frequency handset for use in the States. (If you don't have your SIM card with you, relax. We'll provide a handset with the SIM card included.)As in other countries, you'll find using GSM in the U.S. is often less expensive than calling cards, pay phones and hotel phones. And, of course, far more convenientAll you have to do to enjoy GSM convenience is call one of the numbers listed below. We'll provide the handset to rent within 24 hours, or, in some cities, the very same day.To rent a handset call:In France 0800 508 968In Italy 0800 790948In U.K In U.S 1877 OMNI-2-GOAll other countries +44 SIM 卡要使用您的 GSM 服务在美国吗？携带此小件行李。如果您正在前往美国，一定要带上您的 SIM 卡。因为您的 GSM 服务可以像工作在美国它剂量在家里。你要做的是租住在美国使用合适的频率手机。（如果您不具有您的 SIM 卡，放松。我们会提供一个手机 SIM 卡包括。)在其他的国家一样，你会发现使用 GSM 在美国通常是少比电话卡、 电话和酒店电话。的课程，更方便你要享受 GSM 方便做的只是调用下面列出的数字之一。我们会提供租 24 小时，或在一些的城市非常同一天手机。租手机的调用：在法国 0800年 508 968在意大利 0800年 790948在英国 0800年 328 5396在美国 1877年转到 2-OMNI所有其他国家 + 44 Computer Control TechnologyA computer is a fast and accurate symbol manipulating system that is organized to accept, store ,and process data and produce output results under the direction of stored program of instructions. This section explains why a computer is a system and how a computer system is organized. Key elements in a computer system include input, processing, and output devices. Let's examine each computer of the more detail.计算机是一种快速而又准确的操纵系统，为了接受、 存储，和处理的数据并产生输出结果存储程序的指导下的指令的快速、 准确的符号。此部分说明为什么一台计算机是一个系统和计算机系统的组织方式。计算机系统中的关键元素包括输入、 处理，和输出设备。让我们看一下每台计算机的更多详细信息。Central Processing Unit the heart of any computer system is the central processing unit (CPU). There is three main sections found in the CPU of a typical personal computer system: the primary storage section, the arithmetic-logic section, and the control section. Bit these three sections aren’t unique to personal computers. They are found in CPUs of all sizes.中央处理器是任何计算机系统的核心是中央处理单元 (CPU)。有三个主要部分，在典型的个人计算机系统的 CPU 中找到： 主存储部分、 算术逻辑部分和控制部分。位这三个部分不是唯一的个人计算机。他们有各种规模的CPU。Output Devices Like input units, output devices are instruments of interpretation and communication between humans and computer systems of all sizes. These devices take output results from the CPU in machine-coded form and convert them into a form that can be used (a) by people (e.g., a printed and/or displayed report) or (b) as machine input in another processing cycle.输出设备 如同输入设备，输出设备是文书的解释和人与各种规模的计算机系统之间的 通信 。这些设备从CPU的输出结果以机编码的窗体，并将它们转换为一个窗体，可以在另一个处理周期中使用(a)的(例如，印刷和/或显示报告)，或(b作为输入机。In personal computer systems, display screen and desktop printers are popular output devices. Larger and faster printers, many online workstations, and magnetic tape drives are commonly found in larger systems.在个人计算机显示屏幕和桌面打印机是受欢迎的输出设备。更大、 更快的打印机、 很多的在线工作站和磁带驱动器通常有较大的系统。The operating system must ensure correct operation of the computer system. To prevent user programs from interfering with the proper operation of the system, the hardware was modified to create two modes： user mode and monitor mode. Various instructions (such as I/O instructions and halt instructions) are privileged and can only be execute in monitor mode. The memory in which the monitor resides must also be protected from modification by the user. A timer prevents infinite loops. Once these changes (dual mode, privileged instructions, memory protection, timer interrupt) have been made to the basic computer architecture, it is possible to write a correct operating system.操作系统必须确保计算机系统的正确操作。防止在干扰系统的正确操作用户程序修改硬件创建两种模式： 用户模式和显示器模式。（例如，I/O 指令和停止指令） 的各项说明享有特权，并且只能在显示器模式下执行。显示器所驻留的内存也必须由用户修改保护。计时器可防止无限循环。一旦到基本的计算机体系结构做了这些更改 （双模式、 特权的指令、 内存保护、 计时器中断)，就可以编写正确的操作系统。Completes with the digital signal to the digital quantity carries on the arithmetic operation and the logic operation circuit is called the digital circuit, or number system. Because it has the logic operation and the logical processing function, therefore calls the numeral logic circuit.完成与数字信号，数字的数量进行算术运算和逻辑操作电路被称为数字电路或数字系统。因为它有逻辑操作和逻辑处理功能，因此呼吁数字逻辑电路。Karnaugh Map consists of one square for each possible minterm in a function. The method to write the Karnaugh Map: When we plot a function, we put a 1 in each square corresponding to a minterm that is included in the function, and put a 0 in or leave blank those squares not included in the function.卡诺图包含每个可能的最小项函数中的一方。写入卡诺图的方法：当我们绘制一个函数时，我们放在一个最小项的函数中包含的每个平方米对应的 1 和放一个0或保留为空函数中不包括这些方块。Industrial robot 工业机器人Binary 二进制Semiconductor 半导体Instruction 指令Spot welding 点焊Anode 阳极Counter 计数器Bipolar transistor 双极晶体管Switch 交换机Amplifier 放大器Microprocessor 微处理器Microcontroller 微控制器Digital Logic Circuits 数字逻辑电路Off-line 离线Memory 内存Register 注册Mother board 母板On-line 在线Counter 计数器CPU 中央处理器Cathode 阴极Software 软件Low cost 低成本Programming 编程Electronic Octal 电子八Multimeter 万用表Integrated circuit 集成电路Hard ware 五金Resistor 电阻Diode 二极管
这个不能复制过来的啊，你在百度知道搜索一下就知道了啊
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 ] 。 Fig.1 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 Fig.2, 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。 2.1 Fault transient computing based on PSB 2.1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 ]
在这个绕系统，我们使用三菱A系列PLC作为主控制台 PLC，因为它有快的反应和伟大的能力的特征 信息处理的。 它被用于控制共计的行为 与FX系列PLCs一起的winding系统绕和解开 system. 系统和这些的序列的操作行动 actions予先被编辑了入控制程序由设计师。 control节目设置绕系统的一系列的操作，告诉 the PLCs如何控制系统。 所有传感器的现状或 actuators被保存作为一一些在PLC的输入、产品或者旗子信号 memory. 所以， PLC节目是监测的依据在PLC controlled制造系统。 半新的The程序编制方法是梯子图方法。 PLC 以软件工具跑的形式， system提供一个设计环境 on允许梯子图被开发的主机终端， verified，被测试和被诊断。 首先，高级节目被写 diagrams. 然后，梯子图被转换成二进制指示 codes，以便他们在随机存取存储器(RAM)可以被存放或 erasable可编程只读存储器(EPROM)。 连续的其中每一 instruction由CPU解码并且执行。 Thefimctionof CPU是控制记忆和输出入装置的操作和处理数据 根据节目的。 在PLC的每输入和输出连接点 has被用于的地址辨认输入/输出位。 直接的方法 数据的representation与输入、产品和记忆相关是 根据事实PLC记忆被组织入三个地区： 输入 image记忆、产品图象记忆和内存[4]。
花点钱找个翻译公司吧。百度上很难找到有专业背景的，翻译的东西没法用，都是让歪果仁翻白眼儿的译文。
在国外,电费是:Electricenergy,由电力公司收,utinity是指家里的天然气,水费,垃圾费等公共费用,由地方政府收Incontrasttoconventionalelectricityproductiontheavailabilityofwindenergydependsonfluctuatingmeteorologicalconditionsposingnewchallengestogridoperatorsandutilities.与用传统方式所发的电力不同,风能发电依赖于变化多样的气候条件,这对电网运行员及电网设施来说都是一种挑战.在此文中,应翻译为:电气设施
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电火花加工( EDM )普遍进行了液体介质. 它是一种热过程中材料去除连续放电之间发生的一个电极 工件神色介质流体. 每放电ionizes局部血浆运河,那里温度变得非常高(高达1000◦三) 领导与融合沸腾金属既面临材料[1] . 利用液态一直被视为必不可少的稳定性和效率的过程中, 因为它是已知的液体作为冷却介质中的放电间隙和拆除并冲水 加工出碎片的工作差距. 因此,它扮演的一个最重要作用的材料去除机理. 电火花,是一个有益的加工方法. 它具有很大的优势,在加工工件形状特殊或难加工材料,如塑料模具, 冲模,硬质合金材料和工程材料〔2,3〕. 现在它已广泛应用于制造工程. 尽管他们广泛使用在工业今天,电火花有一些缺点. 其中最严重的缺点是,它可能会导致环境的污染[4] . 据悉,电火花可产生废弃物介质液体,它是非常有害的, 我们应该尽量避免让融入周围的环境. 在另一方面,液体介质一般煤油为基础油, 它会分解并释放有害气( CO和CH4 )在电火花 这将会伤害到健康的运营. 环保原因 绿法电火花未经污染已成为一个热门研究课题,在最近字. 电火花天然气是一种新的加工方法是由邦枝在1997年[5] . 在该方法中,电火花加工是实现天然气代替煤油基础油,使污染降低. 在这种新方法的出现,全世界感到震惊. 把它当作一个最重要的方法具有良好的前景. 但是这种方法有一个致命的弱点,缺乏稳定及低材料去除率( MRR值) . 为克服人手不足的电火花加工气,一种新的方法,超声波振动电火花加工( uedm )在天然气, 在此基础上开发. （用翻译软件）
Abstract— Cobots是连续地使用机器人的类 开发高保真度可编程序的variable传输 constraint表面。 Cobots消耗很少电能 ，既使当提供高产力量和他们的传输横跨各种各样是非常有效率的transmission比率。 Cobotic传输也有能力 to作为闸或变得完全地自由。 设计 Cobotic手控制器的and表现，最近a developed六程度自由触觉显示，被回顾。 This设备说明高力学范围和低功率 consumption可达成由cobots。 彻底的比较 the一个cobotic系统的出力效率对常规 提供electro-mechanical系统。机器人技术的Three关键要求使用为 prosthetics和修复是低重量，低功率 consumption和安全。 我们提出cobotic技术作为a 可能论及所有这些问题的transmission建筑学。 Cobots是运用nonholonomic限制的机器人 of 操纵 轮子 关连 相对 速度 mechanism链接。 cobotic传输连续地是a variable传输(CVT)在正面和阴性之间 ratios， 并且 能 关连 二 平移 速度， 二 rotational速度或者对平移的旋转的速度 velocity [1]。 我们最近介绍了Cobotic手 Controller (图 1)， a 供给动力的六程度自由 cobot和描述它的能力作为一个触觉接口[2， 3]。 通过本文路线，我们显示出， mechanical 建筑学 并且 传输 使用 在 Cobotic手控制器地址全部三在上面 机器人学的mentioned要求的弭补科和 rehabilitation.
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。
你好，软件翻译不太现实。有两种有效途径可供选择：1. 网上搜索 DLT 1033.10-2006 电力行业词汇 第10部分：电力设备。 豆丁和百度都有。 根据国家标准的专业词汇来翻吧。2. cnki翻译助手，专业论文中挑出的专业词汇供您参考。
毕业论文外文翻译：将外文参考文献翻译成中文版本。
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，从外文文章起始处开始翻译，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。
参考文献是在学术研究过程中，对某一著作或论文的整体的参考或借鉴。征引过的文献在注释中已注明,不再出现于文后参考文献中。外文参考文献就是指论文是引用的文献原文是国外的，并非中国的。
原文就是指原作品,原件，即作者所写作品所用的语言。如莎士比亚的《罗密欧与朱丽叶》原文是英语。
译文就是翻译过来的文字，如在中国也可以找到莎士比亚《罗密欧与朱丽叶》的中文版本，这个中文版本就称为译文。
主要标准
翻译是语际交流过程中沟通不同语言的桥梁。一般来说，翻译的标准主要有两条：忠实和通顺。
忠实
是指忠实于原文所要传递的信息，也就是说，把原文的信息完整并且准确地表达出来，使译文读者得到的信息与原文读者得到的信息大致相同。
通顺
是指译文规范、明白易懂，没有文理不通、结构混乱、逻辑不清的现象。
实践产生理论，欧美许多国家的翻译理论是五花八门的。从大的方面来看，可以分为两大派：一派是翻译可能论，一派是翻译不可能论。其实，完完全全百分之百的可能是没有的，完完全全百分之百的不可能也是没有的。
世界上一切翻译活动都是在这两个极端之间进行的。欧洲许多著名的人物，比如马丁·路德、M.阿诺德、F.W.纽曼、J.B.波斯特加特、H.白洛克、Fr.R.诺克斯、V.那巴可夫等等，都对翻译提出了自己的理论。据《开塞尔世界文学百科全书》的意见，这些理论中有些是刚愎自用的。
文库168有毕业设计外文翻译 很多
毕业论文外文翻译：将外文参考文献翻译成中文版本。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，从外文文章起始处开始翻译，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。参考文献是在学术研究过程中,对某一著作或论文的整体的参考或借鉴.征引过的文献在注释中已注明,不再出现于文后参考文献中。外文参考文献就是指论文是引用的文献原文是国外的，并非中国的。 原文就是指原作品,原件，即作者所写作品所用的语言。如莎士比亚的《罗密欧与朱丽叶》原文是英语。译文就是翻译过来的文字，如在中国也可以找到莎士比亚《罗密欧与朱丽叶》的中文版本，这个中文版本就称为译文。扩展资料：外文翻译需要注意的问题1、外文文献的出处不要翻译成中文，且写在中文译文的右上角（不是放在页眉处）；会议要求：名称、地点、年份、卷（期），等 。2、作者姓名以及作者的工作单位也不用必须翻译。3、abstract翻译成“摘要”，不要翻译成“文章摘要”等其他词语。4、Key words翻译成“关键词” 。5、introduction 翻译成“引言”(不是导言)。6、各节的标号I、II等可以直接使用，不要再翻译成“第一部分”“第二部分”，等。 7、注意排版格式，都是单排版，行距1.25，字号小4号，等（按照格式要求）。8、里面的图可以拷贝粘贴，但要将图标、横纵指标的英文标注翻译成中文。 9、里面的公式、表不可以拷贝粘贴，要自己重新录入、重新画表格。
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.