Design and Development of Power Quality Online Monitoring and Analysis System

介绍了电能质量相关的各种指标及电能质量监测的背景及现状,提出一种基于.nET平台上电能质量在线监测分析系统的设计方案。使用C#和SQl SErVEr 2005对电能质量监测设备数据的提取、解码和存储,实现电能质量的评估、报表的生成等功能。Introduces various indicators of power quality and the background and current situation of power quality monitoring,proposed a design method on power quality monitoring and analysis system.C # and SQL Server 2005 is used for data extraction,decoding and stor age from power quality monitoring equipment,achieved functions of power quality assessment,report generation and so on

Research on Parallelization of Three-dimensional Scene Based on Multi-core Processors

提高三维场景的运行速度一直以来都是程序开发人员需要面临的一大难题,随着面向主流应用的多核处理器的出现与普及,利用处理器提供的多个内核而不通过编写多线程的方法来提高程序的并行性成为了一种可能。本文介绍虚拟现实开发工具OPEngl和共享存储系统并行编程接口OPEnMP;分析OPEngl绘制三维场景的一般过程;并以纹理映射为例着重探讨在OPEngl程序中使用OPEnMP来提高程序并行性的方法。Improving the speed of three-dimensional scene has always been a major challenge which programmers need to face.With the appearance and popularization of the multi-core processor,using the cores on processor instead multi-threading methods to improve parallelism of the program has become a possibility.This article introduces the development of virtual reality tools OpenGL and parallel programming interface OpenMP which is a shared-memory systems,analyzes the general process of using OpenGL to draw up the three-dimensional scene,and takes the texture-mapping as an example to discuss how to used OpenMP in the OpenGL program to enhance the parallelism

基于FPGA的高速串行通信嵌入式系统的研究与设计

介绍基于IBM PowerPC 405硬核的嵌入式系统的构建,分析基于嵌入IBM Power PC405硬核的Virtex-II系列FPGA设计的通信嵌入式系统的系统架构,并实现系统设计,最后下载到Virtex-II Pro板上的Prom芯片上。测试结果显示,系统结构紧凑,工作可靠稳定,实现了通信嵌入式系统。在Windows 2000环境下,传输速率约4MB/秒。国家高技术研究发展计划(863计划)项目(2003AA755024

Design and Realization of DMA Transfers in PCI Interface Based on FPGA

PCI总线是高速同步总线,支持单字段传输和突发传输,突发传输中,写一次地址,传输多个数据段。dMA技术是一种由dMA控制器控制的存储器与外部设备或存储器之间大数据量传输的方法,具有传输速度高,CPu额外开销小的优点。介绍了一种使用fPgA在32位PCI接口内实现dMA块模式传输的设计方法,硬件部分基于XIlInX VIrTEX-Ⅱ PrOTM芯片,通过一个OPb-PCI总线桥实现了POWErPC与主机间的PCI接口通信,不仅实现了PCI的突发式传输,发挥了PCI总线的高性能,而且将CPu从繁杂的I/O事务中解放出来,解决了原有通信系统中采用中断方式传输的瓶颈,使得PCI接口卡与主机间传输效率得到明显改善。PCI Bus is a kind of synchronous and high performance bus,supporting burst or single-cycle mode.A burst transfer is one consisting of a single address phase followed by two or more data phases.Direct memory access(DMA) is a means of having a peripheral device control a processor's memory bus directly.DMA permits the peripheral to transfer data directly to or from memory without having each byte(or word) handled by the processor.Thus DMA enables more efficient use of interrupts,increases data throughput,and potentially reduces hardware costs by eliminating the need for peripheral-specific FIFO buffers.Introduces a design method of realizing block DMA transmission in 32-bit PCI interface based on FPGA,with the choice of Xilinx Virtex-II ProTM,realizes data communication between the PowerPC and host by means of a OPB-PCI Bus bridge,not only realizes the burst-mode transmission and embodies the superiority of the PCI bus,but also releases the CPU from the miscellaneous work of I/O,solves the bottleneck of the original communication system,significantly improves the transmission efficiency between PCI interface card and host computer.国家863项目(2003AA755024

基于FPGA电能质量分析仪的设计与实现

实时地监测电能质量的各个参数对电力系统有着重要意义。本文介绍了基于fPgA的一种电能质量分析仪的设计与实现,它的特色在于能够实时的监测每个周期的电能质量参数。首先讲述了使用fPgA进行信号处理的优越性,其次介绍了电能质量分析仪的硬件设计并且讲述了电能信号与数据的处理流程,最后介绍了电能质量分析仪的软件设计

对地电容计算方法的仿真分析

本文介绍了位移电压法计算对地电容的原理。利用Matlab仿真平台,建立了中性点经消弧线圈接地的电网模型。在此模型基础上针对位移电压法的准确性进行了仿真实验。仿真结果表明利用位移电压法能够准确地计算出对地电容,相对误差控制在1%以内

Design and Realization of Power Quality Analyzing System

为实现对电能质量实时监测与管理,提高电力企业信息化水平,综合国内外多种电能质量评估系统的性能,文中设计并研发了一种电能质量在线分析管理系统,实现了电能质量评估工作的系统化、实时化,提高电力企业信息化水平,并为电能质量的控制奠定了基础。该系统基于.nET平台构建开发,分为表示层、业务逻辑层及数据管理层对代码进行优化管理。采用AdO.nET技术,通过统一的数据库管理数据,实现了系统管理、电能质量在线分析及自定义生成报表等功能。该系统具有多指标分析的完善性、自定义生成报表的灵活性、使用方便、界面友好等特点。In order to achieve real-time supervision and management of power quality,enhance informationize level of power enterprises,synthesized the performance of many kinds of energy quality appraisal system on home and abroad,designed and developed one kind of power quality on-line analyzing management system.It realized systematization and timeliness of power quality evaluation work,enhanced informational level of power enterprises,and lay the foundation for power quality controlling.Fundamentally based on the.NET platform,meanwhile it was divided into the presentation level,the business logic level and the data management level,and realized the optimized management to the code.Adopting the ADO.NET technology and unifying database for data management,realized functions such as system administration,power quality online analyzing and custom report generating.The system has characteristics of perfection in multi-index analyzing,flexibility in custom report generating,easy to maintain and user friendly

Design and Development of Power Quality On-line Analyzing System

为实现对电能质量实时监测与管理,提高电力企业信息化水平,同时也为电能质量的控制奠定基础,本文设计并研发了一种电能质量在线分析系统。该系统基于.nET技术分三个层次构建,采用AdO.nET与gdI+等技术实现,支持电能质量指标查询、报表打印、设备管理等功能。本系统具有多指标分析的完善性,自定义生成报表的灵活性,使用方便,界面友好等特点。In order to achieve real-time supervision and management of power quality,enhance informationize level of power enterprises,meanwhile lay the foundation for power quality controlling,this paper designs and develops a kind of power quality on-line analyzing system.Employing technologies such as ADO.NET and GDI+,the system is fundamentally based on the.NET three-layer framework;supports many functions such as inquiry of power quality index,report printing,device management,etc.The system has characteristics of perfection in multi-index analyzing,flexibility in custom report generating,easy to maintain and user friendly

一种基于序分量解耦的谐波潮流算法

针对配电网三相不对称情况下的谐波潮流问题,提出了一种基于对称分量坐标下三序解耦的计算方法。结合电网各主要电力元件在不对称情况下的运行特点,给出了其对称分量解耦的谐波潮流计算模型。在利用计算机编程进行配电网谐波潮流计算时,三序分别求解的特点可以大量减少内存占用和计算量

The Analysis of Harmonic Based on Multi-Processor

随着多核技术的发展,多核计算机逐渐成为市场的主流,由此对程序设计带来了巨大的改变。如何以最少的代价将现有的代码修改成适应多核计算机的程序,已经成为一个重要的课题。从电能质量分析中最重要的谐波检测入手,对谐波检测中利用的傅里叶变换算法进行分析,证明了傅里叶变换结果和谐波的关系,介绍了几种谐波分析的算法,给出了利用OPEnMP编程技术对基于复序列的傅里叶变换算法进行并行化改造的过程,并对并行化的效率进行了分析。实验表明OPEnMP对少量数据的运算效果不是十分理想,比较适合于大数据量的并行运算,同时并行的粒度越大,效果越好。With multi-core technology development,multi-core computer has gradually become the mainstream in the market;It brings tremendous change in program design.How to modify the existing code with the least price and let it adapt to multi-core computers,has become an important issue.Based on the crucial part-harmonic detection in analyzes of the quality of electric energy,analyzes Fourier transform algorithm which used in the harmonic detection,subsequently,proofs of the relationship between the result of Fourier transform and harmonic wave.Furthermore introduces some classical Harmonic analysis algorithms.At the end of this academic thesis emphatically points out the course of parallel transformation in the Fourier transform algorithm which based on complex sequence,and analyses the parallelization efficiency.The experiments show that OpenMP is not expectative for calculating effect of the small amount of data but suitable for the parallel computing of large data