电网单相电压暂降特征量检测的二点算法  

Study on Two-points Algorithm for Characteristic Quantity Detection of Single-phase Voltage Sag

作　　者：马啸[1,2] 应展烽[1,2] 张旭东[2] 吴军基[2] 

机构地区：[1]南京理工大学常熟研究院有限公司,常熟210366 [2]南京理工大学能源与动力学院,南京210094

出　　处：《科学技术与工程》2015年第22期33-37,共5页Science Technology and Engineering

基　　金：江苏省产学研联合创新研究项目(BY2013038)资助

摘　　要：基于求导运算的单相电压暂降特征量检测算法精度受采样频率影响。为此,利用相邻两个时刻的电压采样值构造方程,提出了一种二点检测算法。通过相应增广矩阵,分析了算法的唯一解、无穷解和无解条件。建立了算法Simulink仿真模型,并与传统求导检测法及αβ变换求导检测法进行了对比。仿真结果表明三种算法的检测时间相同,但二点检测算法避免了导数运算造成的误差,检测结果精度更高,且不受采样频率影响,可有效降低电压暂降检测装置对采样频率及运算速率的要求,适合应用于检测速度要求高、谐波含量低的场合。The accuracy of algorithm to detect characteristic quantity for single-phase voltage sag based on deri-vation is affected by sampling rate.A new algorithm, which called two-points algorithm,was proposed based on a equation set constructed by two voltage sampled at the adjacent time.The unique solution condition, unbounded so-lution condition and no solution condition of algorithm were analyzed by utilizing augmented matrix.The comparison between the two-points algorithm, derivation algorithm and the αβderivation algorithm was presented by Simulink model.Simulation results show that the detection times are same for these three algorithms.However, the accuracy of proposed algorithm is better than the other two algorithms and not affected by sampling rate because two-points detection algorithm do not need to calculate derivation.The proposed algorithm reduces demand of sampling rate and operating rate for voltage sag detector.It is suitable for application in actual engineering with high detection speed requirement and low harmonic content.

关 键 词：电压暂降 二点算法 特征量检测 求导检测法 αβ变换求导检测法 

分 类 号：TM935.24[电气工程—电力电子与电力传动]