基于改進(jìn)S變換的微網(wǎng)諧波檢測(cè)方法 

王曉光1，吳素敏1，吳麗娜2，劉觀起2

1 國(guó)網(wǎng)浙江云和縣供電公司，浙江 云和 323600；
2 華北電力大學(xué) 電氣與電子工程學(xué)院，河北 保定 071003 
 

摘 要：針對(duì)S變換受噪聲影響較大的缺陷，提出了基于改進(jìn)S變換的微網(wǎng)諧波檢測(cè)方法。對(duì)諧波信號(hào)進(jìn)行改進(jìn)S變換，根據(jù)變換所得的復(fù)數(shù)時(shí)頻矩陣提取特征量，進(jìn)一步檢測(cè)諧波的頻次、幅值和相位，實(shí)現(xiàn)穩(wěn)態(tài)諧波的檢測(cè)和暫態(tài)諧波的時(shí)間定位。仿真結(jié)果表明，該諧波檢測(cè)方法精確度高且抗噪性強(qiáng)，為微網(wǎng)的諧波檢測(cè)提供了一種有效方法。
關(guān)鍵詞：改進(jìn)S變換；諧波檢測(cè)；微網(wǎng)
中圖分類號(hào)：TM935 文獻(xiàn)標(biāo)識(shí)碼：A 文章編號(hào)：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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