基于DSP+ARM的便携式电能质量分析仪的设计

Design of Portable Power Quality Analyzer Base on DSP+ARM

基于目前主流高端电能质量分析仪的设计方法,文章设计了一种基于DSP+ARM架构的电能质量分析仪,并且利用小波变换的原理对电压暂降、电压骤升以及电压暂时中断等问题进行检测和MATLAB仿真分析;首先文章设计了电能质量分析仪的硬件架构和HPI接口,然后利用小波变换、Mallat算法对波形进行降噪处理,降噪后利用小波变换的模极大值算法结合Mallat算法检测出了发生暂态变化的起始时间和终止时间,再利用骤变后的电压有效值计算公式可判定骤变类型为暂降、暂升还是暂时中断;仿真的结果表明小波变化能较精确的分析出暂态故障的发生时刻以及暂态故障的类型;该结果可以为智能电表算法研究提供较可靠的理论依据。

Based on the popular design method of advanced power quality analyzer,we design a power quality analyzer which is based on DSP＋ARM.At the same time,we detect the voltage dip,voltage swell and voltage interruption which was based on wavelet transform and then emulated with MATLAB.Firstly,we design the hardware structure and the interface of HPI of the power quality analyzer.Then,we denoised the waveform by Mallat algorithm.After that we detected the starting time and the end time of the disturbance by modulus maxima algorithm and Mallat algorithm of wavelet transform.Then we can decide the type of disturbance through calculating the effective value between two points we detected before.The simulation result shows that the wavelet transform can detect the time and the type of disturbance accurately.This result can also provide a reliable basis for the research of intelligent meter.