Islanding detection of grid-connected PV system based on bi-direction voltage harmonic variation

被引：0

作者：

Lü G. ^{[1
]}

Wu Q. ^{[1
]}

Wu C. ^{[1
]}

Cheng H. ^{[2
]}

Shi X. ^{[3
]}

机构：

[1] School of Electric Power Engineering, Nanjing Institute of Technology, Nanjing

[2] Key Laboratory of Control of Power Transmission and Conversion, Ministry of Education, Shanghai Jiao Tong University, Shanghai

[3] State Grid Qingdao Power Supply Company, Qingdao

来源：

Dianli Zidonghua Shebei/Electric Power Automation Equipment | 2019年 / 39卷 / 03期

基金：

中国国家自然科学基金;

关键词：

Bi-direction harmonic; Grid-connected PV system; Islanding detection; Voltage harmonic variation;

D O I：

10.16081/j.issn.1006-6047.2019.03.031

中图分类号：

学科分类号：

摘要：

Aiming at the non-detection zone problem of traditional passive islanding detection for grid-connected PV(PhotoVoltaic) system, a detection method based on bi-direction voltage harmonic variation is proposed. With the analysis of voltage harmonic variation before and after islanding and failure mechanism of traditional voltage harmonic detection method, an islanding detection strategy based on bi-direction voltage harmonic is proposed. The windowed Fourier transform is used to calculate the harmonics of outgoing line current and bus voltage in centralized grid-connected PV system, and thus the harmonic power is obtained. The direction of each harmonic source is determined by the positive or negative polarity of harmonic power in grid-connected operation, and the characteristic orders of harmonic at system side and PV side are selected according to the maximum positive and negative harmonic power values. The sliding windowed Fourier transform is adopted to analyze bus voltage harmonic variation of the two orders, and the islanding detection criteria is established. If the reduction of voltage harmonic at system side and the increment at PV side both meet the criteria, there is an island. Simulative results verify the effectiveness of the proposed method. The method does not affect the output power quality of grid-connected inverters, and can effectively detect islands under serious background harmonics with a small non-detection zone. © 2019, Electric Power Automation Equipment Press. All right reserved.

引用

页码：194 / 199

页数：5

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