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在阐述了工控组态软件对外通信接口体系结构的基础上,提出了一个开发集散控制系统(DCS)仿真操作界面的新方法。该方法使用工控组态软件的图形功能实现DCS仿真界面模型的建立和操作,DCS仿真界面与DCS流程动态数学模型之间通过动态数据交换(DDE)和OPC(OLE for process control)接口进行通信,通过定制ActiveX控件来丰富特殊的DCS界面元素。 相似文献
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现有工控协议模糊测试方法未考虑嵌入式终端系统特点,且对未采用传输控制协议/网际协议(TCP/IP)的工控协议研究较少。基于模糊测试提出一种通用面向对象变电站事件(GOOSE)协议解析漏洞挖掘方法。使用变异方式构造测试用例,给出基于GOOSE报文字段类型、抽象语法标记1(ASN.1)编码方式和比特翻转的3类变异策略;提出基于心跳报文和系统运行信息的终端异常监测方法。设计所提方法的实施系统架构和测试流程,在智能变电站实验室环境中,对某厂家嵌入式终端进行测试,发现2个未公开的GOOSE协议解析漏洞,验证所提方法的有效性,提出防范基于此类漏洞的畸形报文攻击的建议。 相似文献
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The development of an experimental environment with interactive features, suitable both for the reinforcement of undergraduate level teaching of control theory and also for graduate-level research work in the field of intelligent control is described. The students are prepared for the experiment by an interactive session on the Internet before coming into the laboratory. The hardware and the software components of the experiment are integrated to achieve maximum effectiveness in teaching advanced control concepts, such as fuzzy and neuro-fuzzy control. The environment is also suitable for masters-level research work 相似文献
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In most industrial plants, there is a strong drive to provide business applications with some access to real-time data generated from process control systems. Often, this has been in the form of a process historian database server connected to both the distributed control systems/programmable logic controller (DCS/PLC) systems and the business users. It can also take many other forms such as remote X-Windows sessions from the DCS, or direct file transfers from PLCs to users spreadsheets. Regardless of the method, it involves a network connection to both the process and the business side. These network connections are increasingly Ethernet based on both sides, rather than proprietary industrial protocols. At the same time, most control systems now use Ethernet networking as a critical component of their system architecture. This can be for controller-to-controller communications, controller-to-operator console communications or even I/O-to-controller communications. Losing any of these links will directly impact production. The issue is that problems on the business network can be passed on to the process network through this process data link, seriously impacting production. Protecting that process system from external network problems is the focus of this article 相似文献
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设计了1套小型高精度油气水三相流实验装置,重点讨论该装置的测控系统设计及实现。通过比较可编程控制器(programmable logic controller,PLC)以及单片机测控系统的特性,选择PLC为基础构件测控系统硬件,分析了输入输出设备的数量和性质,根据系统的I/O点数和估算的内存字数的要求,选择了西门子S7-224XP CPU,其程序存储器和数据存储器较大,内置集成了2AI/1AO,2个RS485通信端口,设计了数据采集及PID闭环流量控制等功能,可以实现油气水三相流实验室装置的自动控制,用户在由VB编写的上位机上输入理想的流量值,经过PLC程序运算经模拟量模块输出来控制电动调节阀的开度至达到理想流量。 相似文献
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电力系统动态模拟数字主站系统的建设 总被引:3,自引:0,他引:3
随着电力系统数字化进程的加快,传统的纯物理的电力系统动模实验室已难以满足现代电力系统实验教学的要求。为了强化实践环节,对清华大学电力系统动模实验室进行了数字化改造。介绍了动模实验室的数字主站系统的建设情况,包括教学支持应用功能、基于网络的计算机软硬件结构、电力设备的数字化建模和可视化的人机画面,实现了物理动模系统的数字监控和分析,使电力系统实验的能力和效率有了质的飞跃,且已推广应用到国内多个大学。 相似文献
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基于OPC的虚拟DCS对象调试软件开发 总被引:7,自引:4,他引:3
开发了一种基于过程控制的链接和嵌入OPC(OLE for Process Control)技术的面向对象调试软件.实现对虚拟集散控制系统DCS(Distributed Contmls System)的网络化实时在线交互调试。介绍了面向对象调试软件的设计思想,采用虚拟分散处理单元DPU(Distributed Process Unit)程序作为过程控制系统仿真的核心。在软件设计中把OPC服务器嵌入虚拟DCS,直接从DPU中获得对象数据。基于多线程模型的OPC服务器采用Mierosof Visual C 开发,并描述了其主要实现过程。介绍了调试软件的设计与实现,并给出了部分程序代码。 相似文献
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集散控制系统已成为流程工业控制的重要组成部分,对于学生相关知识与技能的培养也成为专业教学的重要一环,但实验设备的匮乏却极大地制约了学生技能的学习与获取。给出一种基于EMERSON-DeltaVDCS的过程控制实验系统。首先介绍了A3000型过程控制实验装置的结构组成,以及DeltaV集散控制系统的特点;其后给出了基于DeltaVDCS的过程控制实验系统的基本结构,硬软件配置、功能以及应用系统组态的基本思路与实施结果。应用表明,系统为学生在专业理论学习与实际工程应用之间搭建了一座桥梁。 相似文献
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国内火电机组采用分散控制系统(distributed control system,简称DCS)实现机组实时控制。当DCS故障或由于在线检修隔绝不当引起主设备无法操作时,往往不易处理且经常扩大事故范围,给电厂带来巨大损失。若机组重要辅机运行过程中存在两套独立且不同的控制策略、信号通道共同运行、并能达到一运一备功能,无疑将极大提高重大辅机长时间运行可靠性。为此,通过田集电厂二期扩建工程后备软手操技术研究和实施工作,首次实现了机组六大风机后备软手操技术,六大风机动叶既可以通过模拟量回路控制,也能切换至后备软手操进行调控,两套控制回路处于不同控制器同时运行,提高了模拟量控制回路的可靠性。 相似文献
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设计了基于PLC的水箱镗孔专机生产线控制系统,主要介绍了系统的硬件组成、软件实现,特别是可变工艺路径、大范围调速运动、恒线速度恒走刀量镗削孔端面、系统暂停功能的实现,极大地保证了系统的快速性、准确性、稳定性和灵活性,很好地满足了工艺精度要求及生产节拍要求。 相似文献
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Ko C.C. Chen B.M. Jianping Chen Zhuang Y. Chen Tan K. 《Education, IEEE Transactions on》2001,44(1):76-86
The Internet provides a new environment for developing a variety of applications for educational and research purposes. This paper presents the implementation of a web-based laboratory experiment on a coupled tank apparatus, a multi-input-multi-output (MIMO) system. The web-based laboratory has been developed to serve students and staff in the Department of Electrical Engineering at the National University of Singapore (NUS). The laboratory is an educational tool for teaching students the basic principles and methodology in performing a series of experiments on a coupled tank apparatus at any time and from any location through the Internet. With the capability to implement strategies for manual, proportional integral derivative (PID), general state-space, and fuzzy logic control, the laboratory also provides a platform for research staff to test control algorithms. Video conferencing has been used to provide audio and video feedback, with a camera mounted on a movable platform so that the user can control both the zooming and viewing angle 相似文献
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分散控制系统(distributed control system,DCS)的稳定运行依赖于其高度的可靠性。针对大容量火电机组的工艺对象特点和控制技术要求,为提高分散控制系统可靠性,提出了实现广义可靠的三原则,即预防为主、弱化影响和在线维修三原则,从系统的网络通信、硬件性能、电源供应、功能预警、软件优化和工程设计方面讨论了三原则的实现方法、原理及具体措施。其中双网双发的通信方式提高了工作链路故障时的系统容错性;公用系统冗余供电方案提高了公用系统的电源可靠性设计;标准化的算法设计规范了软件使用,实现了故障时安全动作。以此整体解决思路设计的1 000 MW等级超(超)临界火电机组控制系统在某大型机组实现了成功应用,通过了恶劣实验的检验和长期运行的考验,可以实现广泛推广。 相似文献
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Antao B.A.A. Brodersen A.J. Bourne J.R. Cantwell J.R. 《Education, IEEE Transactions on》1992,35(1):50-56
A framework for building intelligent tutoring systems (ITSs) to teach students the use of various simulation systems used in engineering education is described. Case studies to two widely used simulators in electronics education (LASAR, a digital logic simulator, and SPICE, an integrated circuit simulator) provide the basis of pedagogical methodology for teaching the use of simulators. This methodology is used to develop a tutorial environment which includes: an authoring system that enables an instructor to develop and tailor the course contents; and a course presentation system that communicates this information via a direct manipulation interface to the user. The student perceives the tutorial as a hypertext network which can be freely explored; however, the tutoring system monitors and dynamically reconfigures the accessible information according to the level and attainment of expertise by the student. The environment includes components to monitor and evaluate the performance of the student. This tutorial framework is used to create intelligent tutorial systems for SPICE and LASAR 相似文献
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基于虚拟DPU技术的DCS流程动态数学模型仿真 总被引:2,自引:0,他引:2
用虚拟DPU技术对TDC3000集散控制系统实现了DCS流程动态数学模型仿真,该法将实际分散控制单元中的DPU功能移植到虚拟DPU软件上,脱离硬件而采用软件仿真实现DPU工作过程的模拟。其中虚拟DPU算法块在VISUAL C++高级评议环境中开发,虚拟DPU通过DDE通讯接口、OPC服务器接口与仿真操作界面通讯。该法既保证了DCS系统的仿真精度又增强了系统的可移植性和可扩充性。 相似文献