上海环球金融中心智能化防灾系统

从介绍建筑智能化防灾系统出发,阐述了其中一些重要的子系统如何在上海环球金融中心建筑中得以实施和应用,对于其他超高层建筑智能化防灾具有参考价值。     

机房环境监控系统的设计分析

根据国电南瑞研发大楼机房环境监控设备的管理需要,提出了机房监控系统的设计依据、设计思想和设计方案。经使用证明,该设计方案是成功的,并取得了较为理想的效果。     

A new wide area information based power system out-of-step oscillation detecting and oscillation center tracking scheme

A new out-of-step oscillation detecting and oscillation center tracking scheme based on the wide area information obtained from phasor measurement units (PMU) is proposed in this paper. In this scheme, the out-of-step oscillation is detected by the change rate of phase angle difference between bus voltage and system current, and the oscillation center tracking is completed by analyzing the phase angle relation between terminal bus voltages of electrical components and the system current. The scheme is easy to implement, and the tracking result is not affected by the changes of system structure and operation modes. Even in the complicated situations that the impedances of the whole system are nonuniform and the equivalent system potential amplitudes are not equal, it can still work well. The simulation results on PSCAD prove it is efficient. Utilizing the tracking results, a new out-of-step splitting criterion is given with which the splitting section can be determined dynamically according to the real-time operation state of power system.     

基于网络服务器的光伏发电短期功率预测研究与应用

通过分析当前国内光伏发电工程的特点,提出一种基于网络服务器的光伏发电短期功率预测系统,充分利用现有监控终端的数据上传能力,结合多数据终端上传的海量数据优化智能算法。此预测系统可以为多个光伏监控系统分时复用,节约了硬件资源;同时预测软件根据其获得的多系统数据特点,利用不同光伏发电系统的数据进行交叉优化,有效提高了预测准确率。     

An analytic drain current model for long‐channel undoped gate stack surrounding‐gate MOSFETs including interface fixed charges

On the basis of the exact solution of Poisson's equation and Pao–Sah double integral for long‐channel bulk MOSFETs, a continuous and analytic drain current model for the undoped gate stack (GS) surrounding‐gate (SRG) metal–oxide–semiconductor field‐effect transistor (MOSFET) including positive or negative interface fixed charges near the drain junction is presented. Considering the effect of the interface fixed charges on the flat‐band voltage and the electron mobility, the model, which is expressed with the surface and body center potentials evaluated at the source and drain ends, describes the drain current from linear region to saturation region through a single continuous expression. It is found that the surface and body center potentials are increased/decreased in the case of positive/negative interface fixed charges, respectively, and the positive/negative interface fixed charges can decrease/increase the drain current. The model agrees well with the 3D numerical simulations and can be efficiently used to explore the effects of interface fixed charges on the drain current of the gate stack surrounding‐gate MOSFETs of the charge‐trapped memory device. Copyright © 2013 John Wiley & Sons, Ltd.     

计算机监控系统的在变电站集控中心应用

主要以集控中心RCS-9001计算机监控系统应用过程中发现的问题为例进行分析,从变电运行专业角度研究讨论计算机监控系统中三遥信息和后台画面规范的建议,并介绍集控中心特点,阐述集控中心后台集控系统在后台机画面和一、二次设备等在遥控、遥信、遥测等方面应具备的信息量以及今后发展过程中需要解决及规范的一些问题。     

一种分布式结构的主-分控集控站群设计方案

目前,许多地区重复建设独立的集控站监控系统,由于各系统之间相互独立,没有信息交换,当一个集控系统崩溃时,许多变电站将失去监控,严重威胁电网安全运行,特别是恢复系统很困难。为此,该文提出利用计算机网络将各集控站系统连接在一起,建设分布式结构的主-分控集控站群,实现各集控站数据交换,完成系统功能优化,达到主-分控系统互为备用,系统集中运行管理、统一维护,主-分控系统数据相互备份的目的。     

电子式互感器合并单元(MU)的研究与设计

合并单元是电子式互感器与二次保护控制设备接口的重要组成部分。简要介绍了电子式互感器合并单元的基本定义及相关国际标准,同时对合并单元的主要功能和实现方法进行了研究,提出了一种基于现场可编程门阵列(FPGA)和数字信号处理(DSP)技术的合并单元实现方案。方案将合并单元分成3个功能模块,并对每个模块所需实现的功能进行了详细阐述和具体分析。试验结果证明该方案能够很好地解决合并单元同时处理任务多、通信信息流量大及通信速度快等一系列问题,具有较高的可靠性和较强的实时性。     

王滩发电厂全厂辅助车间辅控网系统设计

王滩发电厂的全厂辅控网实现了全厂辅助车间的集中控制,实现了辅助车间就地无人职守的目标。为此介绍王滩发电厂全厂辅助车间网络规划、设计、调试的一些思路和经验,为以后的新建机组设计及老电厂改造提供借鉴。     

微电机与微加工

简述了和微电机相关的微加工生产中的方法，介绍了微型机电部件成型的实现途径。