Virtual Laboratory for Creative Control Design Experiments

This paper proposes a two-step strategy for the computer-aided learning of control. A virtual Web-based laboratory for control design experiments (http://www.hl1.uni-mb.si), which supports a two-step strategy, is based on the MATLAB Web server (MWS) and consists of two virtual laboratories. The first virtual laboratory, called ldquoWeb sisotool,rdquo supports computer-aided control design and structured hands-on experiments. Computer-aided control design is welcome as a design tool while structured hands-on experiments are welcome for the visualization of hard-to-grasp concepts. The second virtual laboratory offers students an unstructured MATLAB-like environment, called ldquoM-file application,rdquo that allows students to create and design control design experiments by writing MATLAB M-files of their own and executing them on MWS. The presented virtual laboratory for control design experiments is cost effective and has already been successfully used for the learning of control. Student feedback is also presented.     

Development of a Web-Based Control Laboratory for Automation Technicians: The Three-Tank System

This paper introduces a Web-based control laboratory for experimentation on a nonlinear multiple-input-multiple-output (MIMO) system: the three-tank plant. Using this application, automation technician students can learn in a practical way many fundamental aspects of control processes. The client-side of the virtual laboratory has been developed using the programming support provided by Easy Java Simulations (EJS), an open-source tool for teachers with limited programming skills who want to create Java applications and applets. The lab has been integrated in the collaborative Web-based experimentation environment eMersion which provides more flexibility for the students performing the laboratory experiments.     

Control teaching via low cost setups

In the framework of engineering laboratory education, this correspondence introduces low-cost experiments that are very convenient to illustrate the application of control techniques on true hardware setups. The paper provides the basic schemes of two automatic bridges that can be built from usual laboratory components     

A Digital Control Laboratory

A laboratory facility is described that provides for the experimental study of digital control systems. The activities of the laboratory are designed to permit experiments in data conversion, data acquisition, hybrid system simulation, computer control of typical physical processes, and binary and decimal data transfer between a digital computer and peripheral equipment. The main facility of the laboratory is a PDP-8 computer, a small general-purpose computer. The laboratory program is part of an educational program in the study of discrete systems and computer control system. This program is also briefly described.     

实验室通风机组控制系统的设计与实现

通过PLC与变频器相结合的方式实现了对高校实验室通风机组的自动化控制。该系统不仅满足了高校实验室对化学实验通风工艺的要求,同时便捷地实现了控制的智能化及能源的节约化。     

Robotics-an efficient tool for laboratory automation

As part of a major upgrading of the Dyckerhoff AG, Amoneburg cement plant, Germany, a fully automated quality control and quality assurance system has been installed. The laboratory automation system is the robotics-based QCX/Robolab system. At the production laboratory, samples from nine automatic sampling points are brought by a pneumatic tube transport system to the industrial robot and distributed to sample preparation and analytical equipment. The robot-controlled analysis activity comprises X-ray fluorescence, X-ray diffraction, particle size distribution, and color measurement. The results are used for automatic process control applications. A number of manually operated analytical devices are connected to the system, allowing automatic analysis-data collection for activities like quality test of incoming and outgoing products, environmental protection, etc. Via a network, all analytical and associated production data from the production control system are automatically transferred to the central plant data management system     

基于半压钳位子模块的MMC直流短路故障穿越研究

基于模块化多电平换流器MMC(modular multilevel converter)的柔性直流输电技术,在高压大容量输电领域有广阔的应用前景。直流故障穿越是MMC应用必须解决的关键问题。目前,具有直流故障穿越能力的MMC改进拓扑在功率器件成本和换流器损耗方面依然偏高,并且缺乏物理实验验证。首先,提出一种基于半压钳位子模块的MMC改进拓扑;然后利用子模块电容电压来主动抑制二极管续流效应,迅速清除故障电流和实现自动重启,并且额外成本很低;最后,相应地搭建了1 k V/20 k W物理样机,通过物理实验详细地研究了所提拓扑的直流故障清除和恢复过程,并验证了该拓扑的直流故障穿越能力。     

EMS/DTS一体化系统中若干地调特色模型和算法

传统的EMS/DTS都是面向网(省)调开发的,因此需要依据地区电网的网络结构和管理职能的特点开发具有地调特色的EMS/DTS。文中面向地区电网,研究了若干地调特色模型和算法。其中主变优化功能通过计算调度员潮流分别能够得到实时和阶段性的优化运行方案;消弧线圈自动整定不但能够分区域给出消弧线圈挡位的调整方案,而且还满足考虑自动装置“N-1”校验的整定方法;DTS中基于逻辑判断的继电保护仿真通过网络拓扑实现了对辐射网中保护动作以及低压系统单相接地故障的准确模拟。以上这些模型和算法已在实际地调EMS/DTS中在线应用。     

A multiuser virtual-reality environment for a tele-operated laboratory

In engineering studies, concepts taught through lectures are often complemented by laboratory experimentation. This contribution presents a collaborative virtual environment for a tele-operated laboratory. Students have access to the tele-operated laboratory via the Internet from anywhere at any time. They control the experiments exclusively with their standard Web browser; no additional software is needed. The collaborative environment allows the experimentation in a team. Group members are able to interact and discuss the results of their work. A real collaboration, such as in local experimentation, is possible. The tele-operated laboratory is based on a client/server architecture, which is implemented in the Java programming language.     

Spectral domain arcing fault recognition and fault distance calculation in transmission systems

A new numerical algorithm for recognizing arcing faults for the purpose of automatic reclosing is presented. The fault distance can also be calculated using this algorithm. The solution for both symmetrical and unsymmetrical faults is given. A simple empirical arc voltage model is obtained through a table of numerical values. By means of computer simulation and laboratory testing it is shown that the algorithm can be used as an effective tool in transmission and distribution system protection.     

Compact disc players in the laboratory: experiments in opticalstorage, error correction, and optical fiber communication

The compact disc player is a synergy of optics, communication theory, digital signal processing, and control engineering. This familiar consumer product may be employed as a cost-effective laboratory instrument to teach the fundamentals of optical storage, error detection and correction, and optical communication. The compact disc audio system, from analog input, through optical storage and distribution, to audio reproduction, provides an excellent model of a complete real-world optical transmission and storage system. A series of experiments, which illustrate some of the more significant operational principles of the compact disc player, are presented in this contribution. Optical read-out and the physics of information density are explored through a set of experiments in optical storage. Error detection and correction are studied experimentally by evaluating the performance of the compact disc player's error control system. The design of an optical fiber communication system is studied by extracting the channel bit stream from a compact disc player, transmitting it over an optical fiber link, and then reinserting it back into the compact disc player for audio reproduction     

Application of a reference train model in an automatic control system of freight-train speed

One method to increase the quality of control of automatic control systems of the freight-train speed is to use a reference train model in an automatic control system to consider the dynamic processes occurring in the train. Based on this information, the system operates so as to fulfill the requirements for control quality of the speed according to a given system of criteria. However, the use of the complex reference model reduces the parameters of the automatic control-system response speed. It is possible to simplify the model to increase the response speed, thereby decreasing the order of the system of the differential equations describing the train as the object of control. Surveys that have been carried out made it possible to find the admissible degree of simplification of the model that does not cause a significant decrease in the accuracy of calculations.     

四川电网稳定调度实时监控自动化系统框架设计

四川电网稳定监控项目多,且稳定控制限额的数值随运行参数的变化而变化,给调度实时监控带来巨大困难.提出一种稳定调度监控自动化系统的框架设计,采用离线稳定计算的成果,将影响稳定控制限额的各种因素交给后台系统处理,并将修正后的稳定控制限额及稳定断面潮流等实时数据通过简单、直观的监控画面提供给调度员,改善了调度员传统的人工稳定监控方式带来的繁琐和困难,有效地减轻了调度员工作负担,对保证电网安全稳定运行具有重大的实用价值和意义.     

Extending the application boundaries of the theory of automatic control of thermal power processes

It is shown that the theory of automatic control of thermal power processes is universal in nature, due to which this theory can be regarded suitable for synthesizing automatic control systems for a wide range of technological plants used in different industry branches.     

Pulsed plasma promoted adsorption/catalysis for NOx removal from stationary diesel engine exhaust

A detailed laboratory study on the removal of oxides of nitrogen (NO_x) from the exhaust of a stationary diesel engine was carried out using pulsed electrical discharge promoted adsorbent/catalytic processes. In this study, the filtered exhaust from the diesel engine is made to pass through a combination of plasma reactor and adsorbent/catalytic reactor connected in series. This combination is referred to as cascaded process. In the cascaded plasma-adsorbent process, the plasma treating filtered exhaust was cascaded with adsorbents (MS-13X/Activated alumina/Activated charcoal). The cascaded plasma-adsorbent process exhibits a superior NO_x removal characteristic compared to the individual processes-plasma or adsorbent processes. In the cascaded plasma-catalyst process, the plasma treating filtered exhaust was cascaded with activated alumina catalyst. For the purpose of investigation, both two-stage and four-stage cascaded plasma-activated alumina catalyst processes were separately studied. The synergy effect and limitation of two-stage process and improved performance of four-stage process are explained. Further, experiments were conducted at room temperature as well as at higher temperatures     

基于专家系统的火灾报警与联动实验装置

论述火灾报警与联动实验装置的开发方法。该装置实现了对各物理地址的烟雾、可燃气体浓度、温度等信号的检测,并融合了多传感器信息,通过二总线方式传给控制器：引入了专家系统实现自动报警及对相应现场联动设备的自动控制,提高了智能化：开发了以Delphi编程语言为基础的PC机监控界面,可实时监控下位机的工作情况。该装置已投入实验教学,验证了本文提出方法的有效性。     

模糊控制在鼠笼式异步电动机定位系统中的应用

文章提出了一种基于量化因子自调整的模糊控制器 ,并将其应用于异步电动机定位控制系统中 ,实验结果表明 ,该系统具有很强的鲁棒性和较高的定位精度     

600 MW机组全程给水自动调节系统的最新控制策略

介绍了哈三电厂3号机组(600MW)全程给水自动调节状况,分析了原设计存在的问题,提出了解决问题的办法和实现全程给水控制系统新的控制策略,提供了全程给水控制系统投入运行后的相关调整参数和运行曲线。     

A real-time control platform for rapid prototyping of induction motor vector control

This paper presents a real-time control platform developed for rapid prototyping of an induction motor (IM) vector control. Firstly, the control system is designed with the Simulink in the form of user-friendly block-diagrams. Next, c-codes are automatically generated from the block-diagrams with the real-time workshop. And lastly, an executable code, produced from the c-codes through a DSP c-compiler, is downloaded into a target DSP board. With this automatic programming scheme rapid prototyping is realized with the least low-level handwork programming. Presented control platform has been evaluated through the rapid prototyping of a voltage source inverter-fed IM driver and some experiments have been carried out to show its effectiveness.     

On-Line Minicomputer Usage in Systems Engineering, An Instructional Laboratory Program

The development, methodologies, and first semester implementation of a senior level digital computer laboratory course are discussed. The laboratory centers around the use of a minicomputer and permits dedicated minicomputer usage for real time on-line processing or time sharing as necessary. The experiments emphasize the areas of control and communications. Unique aspects of this course include its development as performed mainly by graduate students (directed by the authors), the nature of the experiments themselves, the relatively large amount of credit it is assigned, the fundamental place it occupies in the Systems and Computer Engineering Curriculum, and its rapid and positive acceptance by students. Future plans for additions to existing experiments, new experiments, modifications in operating systems format, and innovative teaching methods are also described.