Islanding detection based on adaptive positive feedback of negative-sequence voltage

被引：0

作者：

Wang X. ^{[1
]}

Lei S. ^{[1
]}

Hu W. ^{[2
]}

Zhao Y. ^{[1
]}

机构：

[1] State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Baoding

[2] State Grid Hebei Electric Power Research Institute, Shijiazhuang

来源：

Dianli Zidonghua Shebei/Electric Power Automation Equipment | 2016年 / 36卷 / 12期

关键词：

Adaptive feedback coefficient; Islanding detection; Multiple inverters operating in parallel; Negative-sequence disturbance; Negative-sequence voltage;

D O I：

10.16081/j.issn.1006-6047.2016.12.006

中图分类号：

学科分类号：

摘要：

Due to the positive feedback of negative-sequence voltage, the negative-sequence voltage of PCC (Point of Common Coupling) will increase continuously after the occurrence of islanding, which can be used as a criterion to detect the occurrence of islanding. However, too large feedback coefficient will induce too large injection of negative-sequence disturbance into the inverter while too small feedback coefficient will cause the failure of islanding detection. An improved method of islanding detection based on the adaptive positive feedback of negative-sequence voltage is proposed, which modifies the positive feedback coefficient adaptively according to the real-time output power of inverter. The improved method can effectively reduce the injection of negative-sequence disturbance component into grid when multiple grid-connected inverters are operating in parallel while realize the islanding detection within the prescribed time of 2 s after the occurrence of islanding. Theoretical analysis and simulation results verify its reliability. © 2016, Electric Power Automation Equipment Press. All right reserved.

引用

页码：36 / 42

页数：6

共 23 条

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