一种兼顾快速性和精确性的单相电压暂降检测算法  

A Single-phase Voltage Sag Detection Algorithm Considering the Quickness and Accuracy of Detection

作　　者：袁庆伟 王宇[1] 盛晓东[1] 谢晔源[1] YUAN Qingwei;WANG Yu;SHENG Xiaodong;XIE Yeyuan(NR Electric Co.,Ltd.,Nanjing 211102,China)

机构地区：[1]南京南瑞继保电气有限公司,江苏南京211102

出　　处：《供用电》2020年第12期22-30,共9页Distribution & Utilization

基　　金：国网电力科学研究院有限公司科技项目(DW1800121)。

摘　　要：为兼顾单相电压暂降检测的快速性和精确性,构建快速、中速和慢速3种检测算法,提出一种将三者融合的单相电压暂降检测算法。快速检测算法利用常规求导,结合基波电压实时预测,构建虚拟αβ系统;中速和慢速检测算法均采用宽频域求导算法在宽频率范围内精确构建虚拟αβ系统,其中中速检测算法利用软锁相环结合低通滤波器来提取检测结果,慢速检测算法通过构建改进型高阶复矢量滤波器,实现对单相电压基波分量的精确提取,获得精确的检测结果。在电压暂降发生后的不同时间段内,该算法根据3种检测算法的检测速度和精度的差别,选择不同算法的检测结果作为最终结果输出。仿真结果表明,提出的单相电压暂降检测算法可在不同电网电压谐波扰动的情况下,实现对单相电压暂降的快速精确检测。Considering the quickness and accuracy of voltage sag detection,the single-phase voltage sag detection algorithm was proposed in this paper,which contained three schemes respectively featured fast,medium or slow detection speed.To construct a virtual α-β coordinate system based on the single-phase voltage,the conventional derivation combined with real-time prediction of the fundamental voltage was adopted in the fast-detection scheme,while a wide-frequency domain derivative algorithm was employed for both the medium-detection-speed and slow-detection-speed schemes,which could provide a more accurate virtualα-βcoordinate system over a wide frequency range.The medium-detection-speed scheme employed the soft phase-locked loop combined with a low-pass filter to extract the detection results.In the slow-detection-speed scheme,the accurate extraction of the single-phase fundamental voltage was realized by an improved high-order complex vector filter,from which the accurate detection results were obtained.The final results of the proposed detection algorithm were given and varied with time according to the detection difference in quickness and accuracy of the three schemes.The quickness and accuracy of detection for the proposed algorithm can detect the single-phase voltage sag quickly and accurately under different grid voltage harmonic disturbances.

关 键 词：单相电压暂降检测 宽频域求导 复矢量滤波器 检测速度 检测精度 

分 类 号：TM71[电气工程—电力系统及自动化]