基于改进S变换的微网谐波检测方法 

王晓光1，吴素敏1，吴丽娜2，刘观起2

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 
 

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。
关键词：改进S变换；谐波检测；微网
中图分类号：TM935 文献标识码：A 文章编号：1007-3175(2015)02-0043-04

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

WANG Xiao-guang1, WU Su-min1, WU Li-na2, LIU Guan-qi2 
1 State Grid Zhejiang Yunhe Power Supply Bureau, Yunhe 323600, China; 
2 School of Electrical and Electronic Engineering, North China Electric Power University, Baoding 071003, China 
 

Abstract: Aiming at the defect that the noises impacted on the S-transform greatly, this paper presented a harmonic detection method for micro-grid 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.
Key words: modified S-transform; harmonic detection; micro-grid

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