火电厂机组集控运行技术管理

随着社会经济的不断发展，工业生产以及人们的日常生活都对电能的需求不断增大，为了提高供电的质量和效率，火电厂机组集控运行技术的应用已经成为电力行业改革以及电厂实现现代化管理的必然。本文主要对火电厂机组集控运行及其相关技术进行了介绍，对火电厂机组集控运行存在的问题进行了分析，并对火电厂机组集控运行技术管理应注意的事项进行的探讨，以期为电力部门安全稳定运行创造有利条件。     

区域电站非常规集控模式改造方案探析

以水电站A、B、C组成的区域电站群为例,介绍了非常规集控模式的设计原则、系统结构、下属电站与集控中心的通信方案及集中控制策略。     

发电厂单元机组集控运行危险点预控分析

单元机组集控运行是火力发电厂重要的运行方式,同时也是保证机组安全稳定运行的重要环节。火电厂单元机组集控运行危险点多、工作复杂,为提高单元机组集控运行的安全性和可靠性,保证机组的安全生产,应全面分析单元机组集控运行中的危险点,制定相应的预控措施。本文将以某火电厂为例,对火电厂单元机组集控运行中存在的危险点进行了分析,并提出了相应的预控措施。实践证明,对火电厂单元机组集控运行中的危险点进行预控是非常必要的,对提高火电厂单元机组集控运行的安全性和可靠性具有重要意义,具有一定的推广应用价值。     

浅谈集控模式下变电站运行管理

详细介绍了集控模式下的管理模式分类及集控模式下变电站运行管理的注意事项,同时对集控模式变电站运行管理的完善也进行了阐述.     

乌鲁瓦提水电站免维护阀控铅酸蓄电池及充电设备的运行与维护

免维护阀控铅酸蓄电池及先进的充电设备为水电站的安全运行及维护提供了可靠的保障。现阐述了阀控铅酸蓄电池直流电源装置在水电站的运行和维护现状,从水电站运行角度介绍了阀控铅酸蓄电池直流电源的运行、维护、监视、缺陷及异常处理方法。针对免维护阀控铅酸蓄电池及直流充电设备在实际运行中出现的问题进行了分析探讨,总结出一些运行与维护经验。     

发电厂电气集控运行技术研究

对发电厂电气集控运行技术的概念进行了阐述,进而对其核心技术与管理控制模式进行了分析究,为提高和完善发电厂电气集控运行技术提供参考。     

基于流域水电站集控理念进行的监控系统升级改造

本文结合境外某流域水电站监控系统实际运行情况,从技术方案、设备选型、实施效果等方面介绍了以流域水电站集控理念,采用扩大厂站模式进行的监控系统升级改造,并提炼了改造过程中的经验和建议,供其他项目类似情况参考。     

火力发电机组集控运行现状及技术研究

本文从火力发电机组集控运行技术的现状出发,分析了集控运行技术对火力发电机组的控制方式、特性和应用的要求,进而探究了火力发电机组的集控运行核心技术和运行条件,最后提出了电力发电机组主控模式构建和有关电厂集控系统应用的3点建议,对于提升火力发电机组集控技术运行水平具有十分重要的理论和现实意义。     

集控运行专业毕业综合实训与就业岗位相结合的研究与实践

通过分析火电厂集控运行专业的人才培养目标、目前毕业综合实训在学生培养方面存在的问题,对集控运行专业学生毕业综合实训环节进行深入研究,并提出火电厂集控运行专业学生毕业综合实训新方法。     

基于小波神经网络的集中控制水电站群组织结构评价研究

水电站集群控制技术已经成为水电站群集中监控、管理的重要技术,其组织结构的设计对于水电站集群控制管理效率具有重要的意义。针对这一问题,首先对集中控制水电站群组织结构设计思路进行了阐述,建立了集中控制水电站群组织结构评价的CVRC模型;其次,构建了集中控制水电站群组织结构评价指标体系,并在此基础上建立了基于小波神经网络的集中控制水电站群组织结构评价模型;最后,以某水电站集群组织结构的评价为例,验证了所提方法的可行性与有效性。     

设计质量评估体系模型及其构建方法研究

为实现面向产品全牛命周期的设计质量评估，有效支持面向产品全生命周期设计开发，研究了设计质量评估体系模型的层次结构及其构建方法，提出了质量目标层、质量指标层、质量特征层3层评估体系模型，以及各层次相关指标的描述方法；应用质量工具方法和基于案例的智能支持方法等，构建了评估体系模型的过程模型，将评估体系模型的构建过程分为2个阶段：评估体系模型的配置过程及评估体系模型的优化确认过程。将质量功能配置加以改进，应用于评估体系模型的构建。最后，通过具体应用实例证明了上述方法的有效性与实用性。     

发电机转子过压保护方法探讨

本文介绍了发电机转子过压保护的方法,对发电机转子过电压原因及其保护措施进行了分析,设计了一套完整的保护方案,并应用在多处水电站的设计中,取得良好的效果,说明该保护方案具有实际意义。     

Design philosophy of air quality surveillance systems.

This paper discusses the design philosophy of the air quality surveillance systems which Kennecott is installing in the vicinity of its copper smelters in Arizona, Nevada, New Mexico, and Utah. These monitoring systems are part of supplementary control systems (SCS) that are utilized to ensure that short-term ambient air quality standards are met. These systems utilize minicomputers as remote terminals. The interface between a terminal and the primary sensors is via specially designed input/output circuitry. The system is controlled by a centralized host minicomputer, which is connected to each of the remote stations via a telephone line communication network. Real time data is displayed on cathode ray tubes located at strategic locations in the plants. This paper will discuss the system design philosophy from both a hardware and software point of view. The actual experience in design, development, and installation of the system will also be discussed.     

A warpage optimization method for injection molding using artificial neural network with parametric sampling evaluation strategy

A sequential optimization design method based on artificial neural network (ANN) surrogate model with parametric sampling evaluation (PSE) strategy is proposed in this paper. The quality index, such as warpage deformations, thickness uniformity, and so on, is a nonlinear, implicit function of the process conditions, which are typically evaluated by the solution of finite element (FE) equations, a complicated task which often involves huge computational effort. The ANN model can build an approximate function relationship between the design variables and quality index, replacing the expensive FE reanalysis of the quality index in the optimization. Moldflow Corporation’s Plastics Insight software is used to analyze the quality index of the injection-molded parts. The optimization process is performed by a Parametric Sampling Evaluation (PSE) function. PSE is an infilling sampling criterion. Although the design of experiment size is small, this criterion can take the relatively unexpected space into consideration to improve the accuracy of the ANN model and quickly tend to the global optimization solution in the design space. As examples, a scanner, a TV cover, and a plastic lens are investigated. The results show that the sequential optimization method based on PSE sampling criterion can converge faster and effectively approach to the global optimization solution.     

地铁用排热风机的智能通风方案

针对地铁车站排热风机的常规运行控制方法,提出了排热风机的智能控制方式,介绍了智能通风系统的组成和排热风机的布置。结合工程应用实例,阐述了智能通风系统的可靠性及其显著节能效果。     

基于Internet的换热站远程无线监控系统

目前集中供暖已经成为我国北方冬天取暖的主要技术,针对集中供暖各换热站分散的特点,开发了一套基于Internet的换热站远程无线监控系统。利用GRM无线模块提供的Webserver接口进行远程监控总控室与各个换热站之间的数据传输,使用C#高级语言进行监控界面的开发。采用Siemens S7-300 PLC对换热站进行可靠控制,达到自动调节供热温度、管网压力等参数的要求。经现场运行结果表明,该系统具有良好的控制效果,且数据传输稳定,数据传输实时性较好,操作简便。达到了换热站无人值守、智能化供热、按需供热等目的。     

A method for analysis of head cover deformation and vibration amplitude in Francis hydro-turbine system by combination of CFD and FEA

It is of great importance to predict the deformation and vibration characteristics of the hydro-turbine structure accurately for the stable operation when the turbine is running under the alternating load of the flow field. In this paper, we proposed a methodology for analysis of the head cover deformation and vibration amplitude in the high-head Francis hydro-turbine system, in which Computational fluid dynamics (CFD) is employed to simulate the complex flow field in the head cover flow passage and the CFD-captured pressure distribution is provided for Finite element analysis (FEA) as a new load input to obtain more accurate head cover deformation and vibration calculation results. The results obtained by this method are compared with the results of the conventional algorithm and laboratory experimental results, demonstrated a better consistency. The great advantage of this method is that it allows vibration amplitude analysis and predictions under varied working conditions by adjusting the flow field parameters according to the specific working conditions. Therefore, it has supportive significance in optimization of the hydro-turbine structural turbine design as well as stabilizing operations at hydropower stations.

     

基于虚拟仪器技术开发的水电站监测系统的研究

通过对水电站监测系统的分析，应用传感器技术、通信技术和计算机技术结合模块化的设计思想，提出了一种采用虚拟仪器技术，实现在线水电站监测的方法。重点研究和分析了监测系统的数据采集、数据分析和数据通信。此基于虚拟仪器技术开发的监测系统与传统监测系统相比，具有操作方便、易于维修、可靠性高、功能全、自动化程度高、灵活性和可扩展性强等优点，而且性能价格比高，大大提高了水电站监测的准确性、有效性、经济性，为水电站的安全、高效运行提供了保障。     

Inspection Allocation Planning for a Multiple Quality Characteristic Advanced Manufacturing System

Producing products with multiple quality characteristics is always one of the concerns for an advanced manufacturing system. To assure product quality, finite automatic inspection systems should be used. Inspection planning to allocate inspection stations should then be performed to manage the limited inspection resource. Except for finite inspection station classes, in this work, the limited number of inspection stations, of each inspection station class, is considered for solving the inspection allocation problem in a multiple quality characteristic advanced manufacturing system. Since the product variety in batch production or job shop production increases to satisfy the changing requirements of the various customers, the tolerances specified will vary from time to time. This inspection allocation problem is solved using a unit cost model in which the manufacturing capability, inspection capability, and tolerance specified are concurrently considered for a multiple quality characteristic product. The situation of unbalanced tolerance design is also considered. The inspection allocation problem can then be solved according to customer requirements. Since determining the optimal inspection allocation plan seems to be impractical, as the problem size becomes large, two decision criteria (i.e. sequence order of workstation and tolerance interval) are employed separately to develop two different heuristic solution methods in this work. The performance of each method is measured in comparison with the enumeration method that generates the optimal solution. The result shows that a feasible inspection allocation plan can be determined efficiently. ID="A1"Correspondance and offprint requests to: Dr Yau-Ren Shiau, Department of Industrial Engineering, Feng-Chia University, 100 Wenhwa Road, Seatwen, PO Box 25–097, Taichung 407, Taiwan