改进能量算子Nuttall窗频谱校正的闪变测量方法  

Voltage flicker measurement method using improved Teager-Kaiser energy operator based on Nuttall window spectral correction

作　　者：高云鹏[1] 李峰[1] 陈婧[1] 滕召胜[1] 曹一家[1] 

机构地区：[1]湖南大学电气与信息工程学院,长沙410082

出　　处：《仪器仪表学报》2014年第4期745-753,共9页Chinese Journal of Scientific Instrument

基　　金：国家自然科学基金(51107035);中国博士后科学基金(2012M511718);湖南省自然科学基金(12JJ9014);湖南省科技计划(2012RS4003);中央高校基本科研专项基金资助项目

摘　　要：电压闪变已成为当前电力系统的重要污染,如何在复杂环境参数下实时提取闪变包络参数、准确统计闪变值是当前电能质量分析中的难题。分析了复杂闪变包络实时提取误差,构建了改进Teager-Kaiser能量算子包络提取误差修正因子,采用Nuttall窗加权修正能量算子提取结果,再将修正结果进行改进FFT谱分析与校正,推导出电压闪变包络提取的各幅值和频率的修正算式,简化IEC推荐的闪变测量过程,提出并建立了基于改进Teager-Kaiser能量算子Nuttall窗频谱校正的闪变包络实时提取与闪变值计算方法,据此研制了基于ADS8556+TMS320C6745架构的电压闪变在线检测仪。仿真分析和试验结果表明,本文提出的算法能有效克服单一调幅波频率变化、多频率调幅波、电网基波频率波动、谐波与间谐波以及白噪声对闪变检测结果的影响,与传统电压闪变检测方法相比,闪变包络提取实现简单、计算量更小,测量结果准确稳定,可用于电压闪变参数的实时分析与在线检测。Voltage flicker is the important pollution source in power systems currently,and how to extract voltage flicker envelope parameters in real time and accurately obtain voltage flicker value in a complex environment is the difficult problem in the field of power quality analysis.In order to reduce the real-time extraction errors of complex voltage flicker envelope,the error correction factor of improved Teager-Kaiser energy operator is established in this paper.Nuttall window is adopted to perform weighted correction on the results extracted with improved Teager-Kaiser energy operator,then the corrected results are analyzed and corrected with improved FFT method,and the applicable correction formulas for the amplitudes and frequencies extracted from the voltage flicker envelope are deduced.The voltage flicker measurement process recommended in the IEC standard is simplified.The algorithms for voltage flicker envelope real time extraction and voltage flicker value calculation using improved Teager-Kaiser energy operator based on Nuttall window spectral correction are proposed and established,based on which a voltage flicker online detector was developed based on ADS8556 ＋ TMS320C6745 architecture.The simulation analysis and experiment result show that this approach can effectively overcome the influences of single modulation wave frequency change,multi-frequency modulation wave,grid fundamental frequency fluctuation,harmonics ＆ inter-harmonics and white noise on voltage flicker measurement results.Compared with conventional voltage flicker measurement methods,this approach features simple implementation,less calculation in voltage flicker extraction,can obtain precise and stable measurement results,and can be used for the real-time analysis and online monitoring of voltage flicker parameters.

关 键 词：电压闪变 Teager-Kaiser能量算子 Nuttall窗 改进FFT 误差校正 闪变仪 

分 类 号：TM930.1[电气工程—电力电子与电力传动]