一种高精度的电力系统频率估计算法  

A New High Resolution Measurement Algorithm of Real Estimation for Power System Frequency

作　　者：郑胜峰[1] 张佐理[1] 陈学磊[1] 吴新方[1] 

机构地区：[1]浙江工贸职业技术学院电子系,浙江温州325000

出　　处：《电子质量》2012年第1期44-46,共3页Electronics Quality

摘　　要：该文研究了一种基于多重相关原理的电力系统频率估计算法,利用正弦信号的相关特性,对信号进行多重相关运算,极大地提高了信号的信噪比,提高了测量精度。分别讨论了信号的信噪比,采样点数,A/D的量化位数对测量结果的影响,并给出了具体的仿真结果,并与传统的方法进行了比较。实验表明这种方法能有效地对信噪比很低的信号的频率进行估计,在低信噪比下,精度比传统的方法要高1～2个数量级,而且算法简单,物理意义明确,精度却可以满足工程的要求。A new method of frequency measurement is introduced in this paper.By the trait of sinusoidal signal we do some times autocorrelation, which can improve Signal-to-Noise effectively.Length of sampled data,signal -noise ratio and number of ADC quantization bits which influence precision of phase difference measurement are particularly discussed and analyzed.Simulation results and conclusion are given,The simulations proves its feasibility and effectiveness to detect the phase difference.This method has many virtues such as simple theoretic deduction and explicit physical signification,Experiment results indicate this method can estimate signal＇s frequency effectively,it improves 1 - 2 number degree compared to the traditional method.

关 键 词：电力系统 多重相关法 白噪声 

分 类 号：TM744[电气工程—电力系统及自动化]