两电平VSC与MMC通用型平均值仿真模型

提出了两电平电压源型换流器(VSC)与模块化多电平换流器(MMC)的通用型平均值仿真模型。首先总结了两电平VSC与MMC的工作原理,进而理论推导了两者的平均值模型,通过分析两电平VSC与MMC在直流故障下的响应,提出了一种能仿真两电平VSC和MMC直流故障响应的通用建模方法。随后在PSCAD/EMTDC下搭建了一个两电平VSC与21电平MMC的详细电磁暂态仿真模型与平均值模型,对比验证了详细模型与平均值模型在稳态运行、直流故障以及交流故障下的响应。结果表明,所提出的平均值模型能在稳态运行、直流故障以及交流故障下得到与详细模型高度吻合的仿真结果。所提出的平均值模型能极大地提高仿真速度,且提速效果随电平数以及系统规模的增大而愈加明显。所提出的建模方法适用于研究含多个VSC和MMC的较大规模电力系统电磁暂态特性。     

Nonlinear Kalman Filtering Algorithms for On-Line Calibration of Dynamic Traffic Assignment Models

An online calibration approach that jointly estimates demand and supply parameters of dynamic traffic assignment (DTA) systems is presented and empirically validated through an extensive application. The problem can be formulated as a nonlinear state-space model. Because of its nonlinear nature, the resulting model cannot be solved by the Kalman filter, and therefore, nonlinear extensions need to be considered. The following three extensions to the Kalman filtering algorithm are presented: 1) the extended Kalman filter (EKF); 2) the limiting EKF (LimEKF); and 3) the unscented Kalman filter. The solution algorithms are applied to the on-line calibration of the state-of-the-art DynaMIT DTA model, and their use is demonstrated in a freeway network in Southampton, U.K. The LimEKF shows accuracy that is comparable to that of the best algorithm but with vastly superior computational performance. The robustness of the approach to varying weather conditions is demonstrated, and practical aspects are discussed.     

基于DIgSILENT PowerFactory实现IEC第1类风电机组的标准建模

The implementation method for the International Electrotechnical Commission(IEC) generic models of Type 1 wind turbine generator(WTG) in DIgSILENT PowerFactory is presented.The following items are described,i.e.model structure,model blocks and how to implement these blocks in the PowerFactory environment.Case studies under both normal and fault conditions are done with the implemented IEC generic models of Type 1 WTG,and dynamic responses are captured and analyzed.The case study results show that the IEC generic models of Type 1 WTG can correctly represent the performances of Type 1 WTG under both normal and fault conditions.     

励磁调差极性在线校验

按照发电机端电压调节过程及特征，共轭述出一个励磁调差原理框图，并标明励磁调差极性在线测量点。还介绍了备用励磁调节，无功负荷转移和甩无功负荷在线校验方法。     

电力负荷在线建模方法

本文提出了电力负荷建模的新方法。即利用微机测辨装置在变电所测量到的信息，同时辨识负荷的动态特征系数和静态特征系数。此方法和公式非常简单，仿真计算和试验结果表明该方法是可行的。     

On-Line Computerized Product Testing

This paper presents a general review and discussion of the approach and steps taken in performing a feasibility study of online product testing using a process control computer. The problems involved and factors to be considered for this type of project are pointed out. The philosophy and criteria considered in selecting a computer system are discussed along with the authors' experiences in various aspects of overall system capabilities. The capabilities of the developed experimental computerized testing system are also described.     

Generic reconfiguration for restoration

This paper introduces and compares four algorithms by which reconfiguration for restoration of an arbitrary number of interdependent critical infrastructure systems can be achieved. A method of modeling systems called Graph Trace Analysis is used to enable generic operation on various system types. The algorithms described are compared with each other and with prior work when run on a model of an actual electrical distribution system. The described algorithms are also run on an example model to demonstrate the ability to reconfigure interdependent infrastructure systems.     

浅谈办公大楼信息网络综合布线系统

主要探讨了有关办公大楼数据、语音、视频等信息点综合布线的必要性和可行性。     

基于多维数据模型的联机分析处理技术在在线数据分析中的应用

介绍了多雏数据模型、数据立方体和联机分析处理技术（OLAP）的相关概念。提出了一种用于建立数据立方体维度的数据聚类算法，利用该算法对历史数据进行聚类后得到了便于进行OLAP技术分析的维度。基于凝汽器系统的历史数据。以凝汽器系统的真空变化情况为主题，建立了基于多维数据模型的数据立方体，利用OLAP进行了分析。结果表明，OLAP用于挖掘数据中的信息是可行的，而且比传统的数据分析方法优越。     

凝汽器在线清洗机器人

简要介绍了火电厂凝汽器冷却水管结垢的危害及除垢清洗的现状,并对使用机器人进行在线清洗这项新技术进行了详细的介绍,还对其经济性进行了分析。     

电阻在线测试系统设计

本系统设计以单片机为核心,通过合理设计电阻-电压转换电路和自动量程转换电路,实现对印刷电路板上电阻元件的自动在线测试及显示,并拓宽测试范围.     

现代重工有载分接开关简介

介绍了现代重工集团(保加利亚)有限公司生产的变压器有载分接开关的结构和优点。     

变电站电气设备在线监测综述

阐明了变电站电气设备在线监测的一些基本概念和原理,展望了新兴技术在电气设备在线监测中的应用前景,并对其实用性和经济性做了具体分析,指出在线监测是实现电气设备状态维修的必然手段。     

在线净油装置主要参数的设定

对有载分接开关在线净油装置的参数进行了设置和分析,并给出了该装置的使用注意事项.     

新型电能质量在线监测

随着供电部门及用户对电能质量从谐波到暂态监测的需求,目前从测试算法、设备上都需要提高。本文提出了一种基于DSP ARM的双CPU模式的电能质量在线监测新型系统。本文主要介绍了设备的功能、硬件和软件设计及其实现的关键技术,实现了电压暂降/骤升/短时断电等电能质量指标的在线连续监测和超标波形记录,本文还总结了一些抗干扰措施,最后给出了一个测试算例。这种基于DSP ARM的双CPU电能质量在线监测新型系统将实现电能质量监测工作的便捷化、智能化、网络化。     

An Early On-Line Process Computer-Controller

Prior to 1938, the only method to determine optimum operation of an oil cracking still was by sampling at selected points and subsequent laboratory analysis of the fluid samples. This analysis so delayed the results that the information was called "history instead of news." The author designed a process analog computer, using six cascaded Wheatstone bridges, which successfully solved an empirical equation within 12 s, thereby making control of the still possible from current instrument readings.     

综合布线系统的电磁兼容性

电磁兼容是智能建筑综合布线系统的重要内容。介绍了电磁兼容的基本概念和综合布线系统中常用的抗电磁干扰技术。结合实际情况,就如何采取屏蔽、接地、滤波等措施,对综合布线系统进行电磁兼容性设计进行了讨论。指出了抑制电磁干扰在建筑电气综合布线系统中的重要性。     

数字化通用PWM控制器的设计

一般的集成PWM控制电路很难满足软开关PWM控制对各驱动脉冲的时序相位所提出的特殊要求,本文提出了一种采用现场可编程门阵列(FPGA)器件实现数字化通用PWM控制器的方案。该控制器能灵活地产生多路PWM脉冲,可应用于PWM的全数字化控制,并针对一软开关Boost变换器进行了实验,给出了实验结果。     

变压器在线监测技术的应用

介绍了变压器早期故障监测装置的原理以及该在线监测装置的使用实例.