能效测评系统中的变采样速率方法  

Variable Sampling Rate Method for Power Quality Monitoring System

作　　者：马立新[1] 陆雅玲[1] 

机构地区：[1]上海理工大学电气工程系,上海200093

出　　处：《控制工程》2015年第4期752-755,共4页Control Engineering of China

基　　金：国家科技部政府间科技合作项目(2009014);国家自然科学基金(61205076)

摘　　要：能效测评系统间谐波的实时检测的重要性日益突出。在进行间谐波分析时,常用的方法是FFT和DFT计算,但都要满足采样点数为2的N次方,而采样频率经常不是基波频率(50 Hz)的倍数。针对这一采样处理难点,在相应检测的硬件电路结构框图基础上,提出了变采样速率和重构的方法,详细阐述了变速率采样算法和用神经网络进行最大熵信号重构的理论依据,通过Matlab仿真和样机实验,验证了该方法的可行性和正确性,而且该采样方法具有计算量不大、易于由DSP实现的优点,可以应用在间谐波检测领域,具有一定的现实意义。The real-time detection of power quality monitoring system is becoming more and more important. FFT and DFT calculation is always used for harmonics analysis, but it is difficult to meet the requirements that the sampling points N is powers of 2 and the sampling frequency is in multiples of the fundamental frequency 50 Hz. In order to solve this sample processing problem, the variable sampling rate and reconstruction method is proposed based on the corresponding detection of the structure diagram of the hardware circuit. The theoretical basis of the maximum entropy signal reconstruction based on variable rate sampling algorithm and neural network is described in detail. This method is proved to be correct and feasible through Matlab simulation and DSP. In addition, it has less calculation amount and is easy to be implemented by DSP, and has practical significance in interharmonics detection.

关 键 词：间谐波检测 变采样速率 信号重构 DSP 

分 类 号：TM933.4[电气工程—电力电子与电力传动]