基于改进S变换的微网谐波检测方法  

Harmonic Detection Method for Micro-Grid Based on Modified S-Transform

作　　者：王晓光 吴素敏 吴丽娜[2] 刘观起[2] 

机构地区：[1]国网浙江云和县供电公司,浙江云和323600 [2]华北电力大学电气与电子工程学院,河北保定071003

出　　处：《电工电气》2015年第2期43-46,共4页Electrotechnics Electric

摘　　要：针对S变换受噪声影响较大的缺陷,提出了基于改进S变换的微网谐波检测方法。对谐波信号进行改进S变换,根据变换所得的复数时频矩阵提取特征量,进一步检测谐波的频次、幅值和相位,实现稳态谐波的检测和暂态谐波的时间定位。仿真结果表明,该谐波检测方法精确度高且抗噪性强,为微网的谐波检测提供了一种有效方法。Aiming at the defect that the noises impacted on the S-transform greatly, this paper presented a harmonic detection method for microgrid based on the modified S-transform, to carry out S-transform for the harmonic signals. The feature vectors were extracted from the complex number time-frequency matrix of S-transform, detecting the frequency, amplitude and phase of the harmonics further, to realize the steady state harmonic detection and the transient state harmonic time positioning. Simulation results show that the proposed approach can detect the harmonic in micro-grid with high accuracy and strong noise immunity, which provides an effective means for harmonic detection in micro-grid.

关 键 词：改进S变换 谐波检测 微网 

分 类 号：TM935[电气工程—电力电子与电力传动]