一种改进的动态电压凹陷实时检测技术研究  

Research on an Improved Real -time Detection Technique of Dynamic Voltage Dips

作　　者：杨鹏龙 李文磊[1] 李明明[1] 赵甲[1] 

机构地区：[1]宁波大学信息科学与工程学院宁波515211

出　　处：《现代科学仪器》2016年第1期37-41,共5页Modern Scientific Instruments

基　　金：浙江省重中之重学科开放基金资助（XKXL1528）

摘　　要：针对单相动态电压的凹陷／跌落问题，在分析目前应用较多的电压跌落检测方法，如电压峰值检测法、傅里叶变换法、小波变换法、d-q变换法和pqr瞬时功率法等检测方法的基础上，提出了一种改进的检测算法。该算法首先利用积分环节代替微分求导来构造三相虚拟电压，从而使算法能适用于任意非正弦的单相跌落电压的检测，并且可以提高检测速度；其次，针对传统的滤波环节利用单个截止频率低的数字低通滤波器存在实时性差的问题，提出并采用了由一个Elliptic数字带阻滤波器和一个ButterWorth数字低通滤波器串联而成的复合数字滤波器。理论分析和仿真结果表明，所提出的检测方法在保证检测精度的基础上，实时性方面比传统方法更具优越性。Aiming at the sag of the single-phase dynamic voltage, based on the analysis of detection methods of voltage sag such as voltage peak detection method, Fourier transform method, wavelet transform method, d-q transformation method and pqr instantaneous power method, the new detection method of voltage sag was presented The method firstly constructs virtual three-phase voltage using the integral element instead of differential derivative, so that it is applicable to detect the sag of arbitrary single-phase non-sinusoidal voltage, and can improve the speed of detection; secondly, for the problem of poor real-time of a traditional ButterWorth low pass filter, it designed a new type of filter which is consisted of a elliptic digital band-stop filter in series with a digital low pass filter. Theoretical analysis and simulation results showed that the proposed detection method can reduce the detection time without reducing precise, having more advantages than traditional method.

关 键 词：单相电压凹陷 瞬时电压d-q变换 检测技术 滤波器 

分 类 号：TM714[电气工程—电力系统及自动化]