一种电力系统实时测频的精确算法  

A precise algorithm for frequency measurement of power system

作　　者：张艳霞[1] 王良[1] 刘翠艳[1] 

机构地区：[1]天津大学电气与自动化工程学院,天津300072

出　　处：《电工电能新技术》2006年第2期18-20,63,共4页Advanced Technology of Electrical Engineering and Energy

摘　　要：频率是电力系统运行的一个重要质量指标。它反映了电力系统中有功功率供需平衡的基本状态。本文在对技巧离散傅立叶算法(SDFT)[1]进行理论分析和仿真检验的基础上,对算法进行了改进:修正计算公式、对数据进行平滑和加门槛值处理。仿真计算结果表明:改进的SDFT算法能在电力系统频率偏离额定值的情况下自动跟踪频率变化测得其精确值。算法还具有数据窗较短、易于在数字信号处理芯片(DSP)上实现的特点,能够满足实时测量的要求,有着很好的工程应用前景。The frequency is one of the most important characters of power system. It reflects the basic state of active power requirement and supply in power system, Based on theoretical analysis and simulations, this article makes some progress to the smart discrete Fourier transform algorithm （SDFT） ： amending the calculate formula, smoothing the data, and setting a threshold. The results of the simulations show that the improved SDFT algorithm can track the frequency automaticly to obtain its exact value when the frequency of power system deviates from the rating value. The improved SDFT algorithm has a shorter window length, and it is also easier to implement on the digital signal processor. The improved SDFT algorithm can satisfy the demand of real-time measurement and has a bright future in engineering apply.

关 键 词：频率算法 电力系统振荡 

分 类 号：TM744[电气工程—电力系统及自动化] TM935.1