文档介绍：摘要
随着现代电力电子设备和非线性负载的大量使用,谐波污染日趋严重,谐波己成为电力部门及其用户日益关注的问题,因此对谐波进行检测与分析具有重要的意义。本文首先介绍了国内外电力系统谐波测量装置的现状,分析了数字信号处理芯片在电力系统中的应用情况,对谐波分析的相关理论与技术进行了研究,设计了以DSP为核心的硬件与软件系统。
硬件设计方面,根据电力系统中数据采集和处理的实际特点,设计了信号的多通道采样保持和时钟转换电路,实现了多路信号的同步采样和快速转换。充分发挥了微控制器的控制功能和DSP芯片的数字信号处理优势。
软件算法方面,系统采用传统的快速付立叶变换(FFT),对采集的电压和电流信号进行频谱分析。论文中还详细分析了信号的采样问题,以及信号的数字滤波问题。初步设计了对采集数据进行计算和处理的相关软件算法,实现了对谐波的测量功能。
本装置可以快速、准确地进行谐波的测量和分析。
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关键词:DSP;谐波;同步采样;快速傅里叶变换
Abstract
With the wide applications of modern power electronics equipment and nonlinear load,harmonic deterioration has increased rapidly, which has attracted great attentions by powerdepartment and analyzing the situations of the electric harmonic monitoring equipments home and abroad,aiming at the demand of power department and practical application of Digital Signal Processor in the electric power systems is introduced in this paper,it aims at the harmonic theories and technologies analysis and exploits a hardware floor and a software system with DSP core.
The hardware design aspect, according to the electrical power system in the data acquisition and the processing actual characteristic, has designed the signal multichannel sampling maintains with the switching circuit, has realized the multi-channel signal synchronized sampling and the split-second- displayed the micro controller's control function and the DSP chip digital signal processing superiority fully.
The software algorithm aspect, the system uses the tradition to pay fast sets up the leaf to transform (FFT), carries on the spectral analysis to the gathering voltage and the electric current signal. In paper also multianalysis signal sampling question, as well as signal digital filtering preliminary design has carried on putation and the processing related software algorithm to the gathering data, has realized to the overtone survey function.
This equip