火力发电机组的DCS改造

文章介绍了广西柳州发电有限责任公司200MW火力发电机组DCS改造工程及在改造中出现的问题和解决办法,改造后的热控系统运行正常,各项技术的指标均满足要求,达到了改造的预期目的。     

浅谈电厂的热控系统优化方案

本文从电厂热控系统的运行问题入手,着重探讨了提高热控系统可靠性的技术策略,为促进热控系统机组运行的安全性和可靠性提出了可靠的技术支持。     

浙江省联合循环机组热控系统故障分析及措施

结合收集整理近年来浙江省主要联合循环机组热控系统的故障处理情况,从系统软件硬件、信号测量、执行机构和现场设备维护等方面,分析了存在的故障隐患,提出改进的建议措施。供联合循环机组热控系统检修维护及新建机组设计参考。     

提高电厂热控系统可靠性技术分析

在火电发电厂中,设备种类较多,其中,热控系统起着非常重要的作用。如果热控系统发生故障,会直接影响整个发电机组的正常运行,所以,必须要保证热控系统的稳定运行。着重分析了提高电厂热控系统可靠性的技术和所采取的措施,以期能有效提高电厂运行的稳定性。     

胎面胎侧三复合挤出生产线调速的模糊控制

针对胎面胎侧三复合挤出生产线交流电动机组的各个传动点速度难以互相协调、匹配等困难,提出级联型机组线速度模糊控制的技术方案.在对胎面级联生产线调速设计的基础上,详细论述模糊控制器的设计及程序的实现.实际运行表明,采用模糊控制可以满足整个机组的线速度级联、同步、动态补偿、稳定运行等自动化控制要求.     

对火电机组自动化改造的几点看法

针对国内的实际情况，简要分析了火力发电老机组的运行现状及存在的问题，重点提出了对其自动化改造的几点看法和建议。介绍了机组改造后的经济效益。     

通用型热工控制仿真支撑平台及在600MW火电机组仿真机中的应用

介绍了一种适合于多种DCS的通用型热工控制仿真支撑平台TCSS100,并应用于扬州第二发电有限公司的600MW火电机组的全工况仿真机的开发中,实现了火电机组所有热控系统(MCS、FSSS、SCS、DEH、MEH等)的1:1仿真,实际应用表明:该仿真支撑平台具有运行效率高、实时性好、通用性和可扩展性强等优点.所开发的全工况仿真机真实再现了原型机组动、静态的运行特性,可以对运行人员和热工人员进行全面系统的培训和考核,实现了预期的目标.     

核电站仪控系统数字化改造方案分析

针对在役核电站仪控系统数字化改造这一问题,首先分析了改造所要实现的目标,然后阐述了目前DCS和FCS两种改造方案,接着从备件、老化、系统性能、系统功能、系统安全可靠性、运行管理、经济性、改造实施、成熟供货商等多个方面进行分析和比较,最后认为后者有着诸多显著的优越性,应该尽快发展核电站FCS仪控系统。     

龙门吊液压型吊具电动化改造与应用

针对运营时间较长的集装箱港口码头,轮胎式集装箱龙门吊起重机使用的传统液压型吊具存在液压系统故障率高、不节能、不环保的问题,本文提出了电动改造方案并成功用于实际生产,验证了改造方案的可行性,实现了节能环保效益。     

基于PLC的空压机控制系统改造

针对英格索兰EP200螺杆式空气压缩机继电控制系统出现加卸载失控故障等缺点,应用S7-200 PLC、MT6056i触摸屏、传感器等设备器件进行设备改造,为空压机控制系统的运行监测、操作、维护提供了更为精确、安全、便捷、友好的人机界面,提高了机组自控系统的控制精度及运行水平。     

Retrofit fault‐tolerant tracking control design of an unmanned quadrotor helicopter considering actuator dynamics

This paper presents a retrofit fault‐tolerant tracking control (FTTC) design method with application to an unmanned quadrotor helicopter (UQH). The proposed retrofit fault‐tolerant tracking controller is developed to accommodate loss‐of‐effectiveness faults in the actuators of UQH. First, a state feedback tracking controller acting as the normal controller is designed to guarantee the stability and satisfactory performance of UQH in the absence of actuator faults, while actuator dynamics of UQH are also considered in the controller design. Then, a retrofit control mechanism with integration of an adaptive fault estimator and an adaptive fault compensator is devised against the adverse effects of actuator faults. Next, the proposed retrofit FTTC strategy, which is synthesized by the normal controller and an additional reconfigurable fault compensating mechanism, takes over the control of the faulty UQH to asymptotically stabilize the closed‐loop system with an acceptable performance degradation in the presence of actuator faults. Finally, both numerical simulations and practical experiments are conducted in order to demonstrate the effectiveness of the proposed FTTC methodology on the asymptotic convergence of tracking error for several combinations of loss‐of‐effectiveness faults in actuators.     

Decentralised controller structure design and retrofit of process systems based on graph theory

A relative degree matrix-based design method is proposed in this article by using graph theoretical methods for optimal control structure design consisting of single input–single output control loops. This approach enables us to use an efficient algorithm for finding a maximum weighted matching to solve the controller structure selection problem. The resulting optimal structures have been refined by analysing the zero dynamics of the input–output pairs. A novel method for decentralised controller structure retrofit is also proposed in this article. A graph theoretic algorithm is developed, which is based on finding the closest weighted maximum matching. Possible changes in efficiency in the controller structure, which may arise after retrofit, are illustrated using a heat exchanger network retrofit case study.     

涟钢30m2和40m2烧结机自动配料控制系统

介绍烧结机的配料系统采用ＰＬＣ加上位管理机来改造原有手工操作,收到了较好的效果。具体介绍自动配料控制系统的组成,ＰＬＣ和称量控制仪表的选择,系统的控制与操作,还介绍了系统软件功能及特点,系统抗干扰措施。     

BOPET聚酯薄膜生产线控制系统的改造

介绍了BOPET聚酯薄膜生产线的控制系统原理，系统结构，以及对控制系统的改造。     

基于节能瓶颈诊断的循环冷却水系统节能改造

循环冷却水系统是一种常用的工业辅助系统,具有极大的节能潜力,目前对该系统的节能改造往往具有盲目性.鉴于此,基于节能瓶颈诊断对循环冷却水系统进行节能改造分析和研究,以提高改造针对性和节能效果.根据循环冷却水系统特点对能耗分解方法进行改进,提出多工况能效分解法,将该方法与正交试验分析方法相结合设计一种两维度的系统节能瓶颈诊断方法,对系统节能状态进行分析,确定系统各部分的改造优先级,以改造优先级为基础,结合相应的改造措施形成优化问题以实现改造方案的设计.同时结合项目后评价知识,对各最优方案进行评价,从而为决策者提供更多决策信息.最后通过案例应用验证所提出方法的应用效果.     

基于艾讯智能模块的硫化车间集散型控制系统

提出采用集散型控制系统对现有的硫化设备控制系统进行低成本改造,详细介绍硫化车间集散型控制系统的功能配置,系统的软、硬件设计,系统及各层网络之间的通信。     

Application of clustering for the development of retrofit strategies for large building stocks

In order to reduce energy consumption and emissions from the built environment, it is vital to transform the existing building stock and develop retrofit strategies to achieve energy efficiency and building-integrated renewable energy supply. Compared to developing cost-optimal retrofit strategies for one building, the development of strategies for 100 to up to 10,000 buildings remains a major challenge. This paper presents a method to cluster buildings based on their sensitivity to different retrofit measures, focusing on the cost-effectiveness. Derived from algorithmic clustering and combined with time and cost data, a tailored development of retrofit strategies for large building stocks becomes possible. Improved identification of retrofit measures and strategies, in contrast to the conventional classification based on building type and age, is demonstrated. The method is illustrated, using the data from the case study project ‘Zernez Energia 2020’, which aims to achieve carbon neutrality of a Swiss alpine village.     

炼油企业蒸汽动力系统改造优化研究

针对当前形势下炼油企业蒸汽动力系统存在的巨大改造潜力,提出了蒸汽动力系统改造的优化方法;该方法首先通过运行优化方案分析和系统设备诊断找出系统存在问题,然后通过专家知识系统提出一系列解决的方案,建立系统改造方案的超结构和考虑柔性调节的优化改造混合整数线性规划(MILP)模型,求解模型并确定最优的改造方案;文章最后部分给出了详细的案例分析,结果表明应用本文提出的改造优化策略方法确定的最佳改造方案可以为案例背景炼油企业蒸汽动力系统节约大约6%的运行费用,投资回收期约0.38年;本文提出的优化改造方法为推动炼油企业蒸汽动力系统的节能降耗提供了定的理论指导和技术支持.     

PLC在零度带束层生产线电气改造控制系统中的应用

主要阐述了用OMRON公司的C200H可编程控制器（PLC）对汽车轮胎生产过程中的零度带束层生产线进行电气改造的工艺及原理。并对整个控制系统的设计进行了介绍。     

On the application of multiple criteria decision making to a problem in defence systems acquisition

Multiple criteria decision theory (MCDT) approaches to choice making are receiving increased attention due to the increasing importance society places on incorporating the non-commensurate and conflicting objectives of a situation into the choice making process. Process algorithms for multiple objective optimization theory (MOOT) and multiple attribute utility, theory (MAI5T) motivated a combined approach which utilizes, in an efficient manner, the complementary aspects of both processes. An appropriate application for the multiple criteria approach is a specific military equipment acquisition involving aircraft retrofit. The retrofit of a particular aircraft with equipment designed for a mission which the aircraft was not originally designed to fly typically requires a large systems effort. Specifically, the retrofit of an aircraft with sophisticated electronic warfare (EW) equipment has historically involved inefficiencies and inadequacies including schedule and budgetary overruns and a lack of initially specified final product performance. Development of a useful combined MOOT/MAUT process seems a logical choice to ameliorate the difficulties of current electronic warfare aircraft retrofit design (EWARD) processes. This paper generates a set of criteria for evaluation of alternative retrofit systems in the defence systems acquisition cycle and develops an efficient framework for EWARD through extension of a MCDT approach for this application.