交流采样技术在嵌入式状态监测系统中的应用  

Application of Alternating Current Sampling Technology in Embedded State Monitoring System

作　　者：张立[1] 胡玉贵[1] 

机构地区：[1]军械工程学院电气工程系,石家庄050003

出　　处：《电力系统及其自动化学报》2009年第3期97-101,共5页Proceedings of the CSU-EPSA

摘　　要：为实现嵌入式状态监测系统对电站输出交流信号的实时监测,结合工程实际选用交流采样技术对信号进行采样,并利用适合的数字测量算法计算信号的真有效值和频率。通过仿真测试比较,快速傅里叶变换算法能在频率稳定和频率波动的情况下以较高的精度对异步采样信号进行技术参量求取,同时有效抑制了低次谐波和直流信号的干扰。将交流采样技术应用于嵌入式状态监测系统,不但利用嵌入式处理器的快速性和实时性克服了交流采样运算复杂的缺点,而且交流采样技术反向节省了系统的硬件开销,实现了优势互补。In order to realize monitoring the alternating current （AC） output signals of power station in embedded real-time state monitoring system, according to real project, AC sampling technology was chosen to sample the output signals. At the same time, proper digital measurements were adopted to calculate the true effective values and frequencies of the signals. After the simulation test and comparison, it is proved that the algorithm of fast Fourier transform（FFT） is very accurate technical parameters from the sampling points in the condition of stable frequency and unstable frequency, and besides that the algorithm of FFT can inhibit low order harmonic components and direct current（DC） signal effectively. That AC sampling technology was applied in embedded state monitoring system to not only overcome the calculation complication of AC sampling with the rapidity and real-time capabilities of embedded microprocessor unit, but also reduce the hardware scale and realize dominance complementation.

关 键 词：交流采样 状态监测 嵌入式系统 快速傅里叶变换 

分 类 号：TM933[电气工程—电力电子与电力传动]