基于海拉瓦技术的输电线路施工管理数字沙盘系统的开发与应用

构建一个三维数字沙盘施工管理平台,可以为输电线路工程建设施工服务,有效提高施工效率,实现施工管理的数字化。以海拉瓦洛斯达技术为基础,提出了数字沙盘建设的思路和总体设计,并明确了数字沙盘在全过程数字化电网中的位置和作用;针对数字沙盘数据维护工作中的分布式特征,提出安全可行的数据更新机制。通过在华北电网有限公司实际工程中的应用说明,基于海拉瓦技术的数字沙盘系统在实际施工管理中有着较好的辅助作用。     

A three-layer 3D silicon system using through-Si vertical opticalinterconnections and Si CMOS hybrid building blocks

We present for the first time a three-dimensional (3D) Si CMOS interconnection system consisting of three layers of optically interconnected hybrid integrated Si CMOS transceivers. The transceivers were fabricated using 0.8-μm digital Si CMOS foundry circuits and were integrated with long wavelength InP-based emitters and detectors for through-Si vertical optical interconnections. The optical transmitter operated with a digital input and optical output with operation speeds up to 155 Mb/s. The optical receiver operated with an external optical input and a digital output up to 155 Mb/s. The transceivers were stacked to form 3D through-Si vertical optical interconnections and a fabricated three layer stack demonstrated optical interconnections between the three layers with operational speed of 1 Mb/s and bit-error rate of 10^-9     

输电线路三维数字化设计平台建设与应用研究

本文概述了三维设计技术应用现状,介绍了以三维GIS、多源海量数据管理等关键技术为主的三维数字化技术,研究开发了输电线路三维数字化设计平台,可实现三维场景下的数字化设计工作。从平台架构、主要技术路线、数据管理及三维协同设计业务等功能应用方面介绍了平台建设思路。通过平台提供的信息化技术和海量数据资源,可提高咨询设计服务水平,为电网企业资产全生命周期管理信息化建设提供数据支撑及信息化管理服务。     

Real-time digital simulator for power system analysis on ahypercube computer

A digital simulator based on a hypercube-type massively parallel computer, the NCube2, has been developed. The simulator features: real-time simulation of a large power system which covers transient stability through long-term behavior with constant accuracy level in root mean square values; user-friendly man-machine interfaces which mimic the actual operating environment including interactive setting of several system parameters and real-time data presentation on a CRT; and high-speed A/D (analog to digital) converters, D/A (digital to analog) converters, and D/IO (digital input and digital output) interfaces are used to connect the digital simulator (power system dynamic model) to actual equipment. The authors describe the basic characteristics of the digital simulator and present results obtained in real-time simulations     

基于云平台三维数字化输电线路路径规划方法

三维数字化设计是近年来输电线路设计研究中的热点方向,为解决三维数字化输电线路路径规划中的海量数据挖掘问题,研究了一种基于云平台的输电线路三维数字化设计路径规划方法.首先使用云平台和三维GIS技术,建立了复杂地理信息的数字化成本评估模型,并将其成本评估模型等效为加权栅格矩阵,再使用数据挖掘中的Q-learning方法进行最优路径规划.实验结果表明,所研究的方法可以对输电线路设计中的海量数据进行深度挖掘,其结果可使设计人员的设计效率提高65％,同时设计成本降低5％.     

基于DSP的在线FIR数字滤波器设计及实现

在线数字滤波器就是采集模拟信号进行数字化后,送人DSP进行滤波处理,再实时输出滤波后的模拟信号的一个系统。从滤波器的技术指标出发,运用MATLAB软件设计FIR滤波器的参数,使用汇编语言编写DSP处理器的FIR数字滤波器程序和AD／DA转换器接口程序,实现了一个在线FIR数字滤波器。通过了软件仿真和硬件在线调试,给出了实验波形。     

输电线路选线三维GIS技术及工程应用

根据输电线路设计过程的需求特点,主要介绍了三维GIS(全球定位系统)技术在输电线路路径选择中的应用。利用数字高程模型(DEM)、数字正射影像(DOM)、海量数据处理技术及3D GIS技术,构建输电线路三维选线平台,并在大新—南宁500 kV交流输电线路工程的设计过程中应用。GIS系统功能包括三维优化选线、设备管理及高级功能管理,是线路运维信息化技术的扩展及设计方式的创新。     

双馈风力发电及变流控制的数/模混合仿真方案分析与设计

数/模混合仿真(D/PHS)是风电技术的一种极具前景的研究手段.文中介绍了实时数字仿真器(RTDS)的特点,对能量型和信号型D/PHS系统的原理和稳定性进行了对比分析.采用RTDS和自主开发的变流器控制系统,设计了双馈变速风力发电机的信号型D/PHS方案,详细阐述了数字模型和控制系统的实现方法.针对一台2 MW风电机组的D/PHS算例验证了文中方案的有效性.     

A Hardware Digital Controller for Undergraduate DDC Experiments

This paper describes a digital control laboratory facility which teaches the central concepts of digital control without requiring a background in digital systems and/or machine language programming. The heart of the laboratory is a flexible hardware digital controller replacing the traditional analog control components in a D. C. servo system. The digital controller can be adjusted to provide versions of the standard PID control algorithm with adjustable word length and computation delay. Through a series of graded experiments this hardware can provide: (1) an introduction to digital control concepts and components, (2) an introduction to digital signal processing, (3) experience with basic DDC algorithms, (4) experience with problems encountered in the choice of sampling rate and digital word length, and (5) experience in working with and trouble-shooting an operating digital control system. Since one controller can be provided for each laboratory station the student has considerable freedom to learn by doing at his own rate.     

三维数字沙盘技术综合平台辅助电网工程建设的应用研究

以三个技术,即：数字沙盘系统、全息图、虚拟交桩技术介绍了三维数字沙盘技术平台在电网工程建设管理方面的应用,并分别展示了这三种技术在实际线路工程建设中的应用的成果。     

基于DSP控制的车用无汞HID灯电子镇流器

指出了车用无汞高压气体放电灯(D3SHID)与车用有汞高压气体放电灯(D1SHID)的区别。针对车用无汞HID灯的特点,采用DSP系统设计了电子镇流器。给出了软件的控制策略,以及数字控制系统的设计步骤和方法。实验结果表明,实验样机工作稳定,具有较高的效率。     

Restoring David using 3D

Refurbishing Michelangelo's David has produced several useful restoration guidelines. These guidelines can help restorers select the proper procedures for the task and, objectively, assess the results. The work also has helped us develop innovative ways to process and visualize 3D data in cultural heritage projects. The David restoration was an ideal test bed. We try various methodologies to support restorers and scientists with visualization tools based on 3D digital models. 3D digital models can be a tool for undertaking specific investigations, or as supporting media for archiving and integrating the restoration-related information.     

基于数字孪生的变电站逻辑模型移交深化应用

为提升电网智能化、数字化水平,针对变电站逻辑模型的建模、移交及展示3个方面提出一套完整的变电站数字化移交应用研究方案。首先研究了变电站逻辑模型建模总构架、数据库文件建模格式和数字化信息交互的方案,通过将逻辑模型中的抽象概念与实体概念相结合,设计出合理的数据结构,实现逻辑模型的全数字化表达;其次对移交格式、导入导出接口进行了详细的阐述,开发了数字化全景逻辑模型信息展示平台,将数字化逻辑模型信息与三维模型相关联,并用于展示变电站相关数字化信息。所提数字化设计的逻辑模型移交研究是对变电站纯物理模型移交的一个补充,为数字化电网发展提供基础。     

CMOS Ultrasound Transceiver Chip for High-Resolution Ultrasonic Imaging Systems

The proposed CMOS ultrasound transceiver chip will enable the development of portable high resolution, high-frequency ultrasonic imaging systems. The transceiver chip is designed for close-coupled MEMS transducer arrays which operate with a 3.3-V power supply. In addition, a transmit digital beamforming system architecture is supported in this work. A prototype chip containing 16 receive and transmit channels with preamplifiers, time-gain compensation amplifiers, a multiplexed analog-to-digital converter with 3 kB of on-chip SRAM, and 50-MHz resolution time delayed excitation pulse generators has been fabricated. By utilizing a shared A/D converter architecture, the number of A/D converter and SRAM is cut down to one, unlike typical digital beamforming systems which need 16 A/D converters for 16 receive channels. The chip was fabricated in a 0.35-mum standard CMOS process. The chip size is 10 mm², and its average power consumption in receive mode is approximately 270 mW with a 3.3-V power supply. The transceiver chip specifications and designs are described, as well as measured results of each transceiver component and initial pulse-echo experimental results are presented.     

TMS320VC5402与模数转换器AD1674的接口设计

DSP系统是一种新型的快速数字处理系统,处理的信号是数字信号,模数转换是DSP必需的外围电路。介绍了高性能定点DSP芯片TMS320VC5402和ADC芯片AD1674的主要特点,设计了基于TMS320VC5402与AD1674的接口电路及软件编程。     

一种便携式天气雷达数字中频测试系统

雷达数字中频系统是雷达接收系统的核心部件,其性能直接影响到整个雷达系统的工作效率.介绍了一种可行的便携式数字中频测试系统的硬件测试平台和软件控制程序,通过对天气雷达数字中频的A/D信号数据采集测试和I/Q数据测试,分别实现了分析数字中频A/D信号和I/Q数据的FFT频域分析界面和Time Data时域分析界面的图形,能够快速地分析、处理和显示,可以准确、高效的完成对天气雷达数字中频的测试和维护;解决了雷达台站无法配置频谱仪等昂贵设备的条件限制,缩短了技术支援的时间和实效性,可提高对天气雷达的业务保障时效,为天气雷达的现场测试保障体系提供一种新的解决方案.     

A computer-aided design tool for developing digital controllers andrelays

The design, development, and implementation of a computer-aided design (CAD) tool for developing digital controllers and relays are presented. The development includes modeling A/D converters, software, and the necessary logic. Procedures for modeling A/D converters and simulating the software are described. Application of the CAD tool is demonstrated by evaluating and comparing three different designs of a digital overcurrent relay. The designs are evaluated to determine both the speed and accuracy of the relays. The effects of the size of the A/D converters, the word-size used in computations, and the truncation/rounding are included in the simulation. Also described is the algorithm used in the relay design     

三维数字化电网解决方案

讨论三维地理信息系统技术应用于输电线路设计、评审、施工和运行维护管理各阶段的技术路线和基本原则, 并从实践中总结了一套完整的三维数字化电网的整体解决方案。     

Purdue's Junior-Level Control Laboratory with Microprocessors

A microprocessor-based direct digital control system laboratory developed at Purdue University is discussed. The microprocessor controller interfaces directly to an analog computer for simulation control or to control components such as motors, heaters, etc. Available resident processor routines (A/D, D/A, arithmetic, timing, etc.) can be easily configured into a digital control system program allowing strategies to be quickly developed and tested. Al operations are performed directly at the control station via a terminal keyboard, and the system has the potential for stand-alone operation with a graphics output terminal A typical digital control system example-servo position control-has been developed for use in the Junior Control Laboratory. In addition to unlimited possibilities for software strategies, patchable features such as comparators, logic circuitry, timing functions, etc., are available on the front panel, allowing quick, efficient development of a complete digital control system.     

一种高稳定数控恒流源的设计

设计了一种高稳定的数控直流恒流源。以单片机为控制核心,采用模拟比较器反馈控制和A/D、D/A转换器的数字反馈控制,提高了输出电流的稳定性和精度。经实际测试,该恒流源纹波电流小、步进调整功能可靠。恒流值给定和测试精度、变负载恒流稳定性均基本达到0.1%水平。