【摘要】 针对一种氧化锌避雷器阻性电流提取新方法,设计制作一个信号处理谐波分析模块,该模块以Digital Signal Processor(DSP)为核心,利用高速ADS8556进行模数转换。以TMS320LF2812对数据进行算法处理,从而得到新方法要求提取阻性电流所需的全泄漏电流基波、谐波幅值等特征量。首先建立了系统的硬件电路,在此基础上,设计了相应的软件程序,编写了A/D采样子程序、滤波算法子程序、积分算法子程序、Fast Fourier transform(FFT)算法子程序、阻性电流提取子程序等。软件仿真验证及搭建实际模拟电路验证表明,该设计系统可以准确进行数据采集后进行精确数据运算处理,最终提取出阻性泄漏电流。该模块可以满足系统需要进行准确的谐波分析。更多还原

【Abstract】 This paper designed a harmonic analysis module which is based on a new method of extracting zinc oxide arrester impedance current. With Digital Signal Processor( DSP) as the core,using ADS8556 which is highspeed to transform analog signal,and using TMS320LF2812 to process data,the module will get characteristics:fundamental current amplitude,harmonic amplitude of whole leakage current which required by new method for extracting impedance current. This paper introduced the system hardware circuit and designed the software program on this basis like the A/D sampling subprogram,filter algorithm subprogram,integral algorithm subprogram,FFT( Fast Fourier transform) algorithm subprogram,resistance current extraction subprogram,etc. Data will be collected and then processed by using this system and the final the resistance leakage current which is the key to monitoring will be obtained. This paper also verified the results by software simulation and the actual analog circuit testing. The result confirmed that the module can well meet the needs of the system to do harmonic analysis.更多还原