An Islanding Detection Method Based on Dual-Frequency Harmonic Current Injection Under Grid Impedance Unbalanced Condition

被引：75

作者：

Cai, Wen ^{[1
]}

Liu, Bangyin ^{[1
]}

Duan, Shanxu ^{[1
]}

Zou, Changyue ^{[1
]}

机构：

[1] Huazhong Univ Sci & Technol, State Key Lab Adv Electromagnet Engn & Technol, Wuhan 430074, Peoples R China

来源：

IEEE TRANSACTIONS ON INDUSTRIAL INFORMATICS | 2013年 / 9卷 / 02期

关键词：

Anti-islanding detection; distributed generation (DG); harmonic current injection; impedance detection; three-phase grid-connected inverter; PERFORMANCE ASSESSMENT; SUBSEQUENT; INVERTER;

D O I：

10.1109/TII.2012.2209669

中图分类号：

TP [自动化技术、计算机技术];

学科分类号：

080201 [机械制造及其自动化];

摘要：

This paper proposes a three-phase grid impedance detection method based on dual-frequency harmonic current injection for islanding detection. Grid impedance detection based on single harmonic current injection is reliable in three-phase impedance balanced grid. However, under impedance unbalanced condition, the harmonic voltage caused by the injected symmetric harmonic current is asymmetric, which affects the calculation of grid impedances and even leads to failed detection. The method based on dual-frequency harmonic current injection is injecting two non-characteristic symmetric harmonic currents, and then according to the different harmonic voltages caused by different frequency harmonic currents, all three-phase impedances can be calculated accurately. The implementing algorithm of the presented method is derived and its performance is analyzed in detail. Simulation and experiments are carried out under grid impedance balanced and unbalanced conditions. Theoretical analysis and experiment results proved that the proposed method is feasible.

引用

页码：1178 / 1187

页数：10

共 28 条

[1]

Suppression of line voltage related distortion in current controlled grid connected inverters [J].