Flexible Control Strategy for Grid-Connected Inverter Under Unbalanced Grid Faults Without PLL

Power oscillation and current quality are the important performance targets for the grid-connected inverter under unbalanced grid faults. First, the inherent reason for the current harmonic and power oscillation of the inverter is discussed with a quantitative analysis. Second, a new control strateg...

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Bibliographic Details
Published in:IEEE transactions on power electronics 2015-04, Vol.30 (4), p.1773-1778
Main Authors: Xiaoqiang Guo, Wenzhao Liu, Xue Zhang, Xiaofeng Sun, Zhigang Lu, Guerrero, Josep M.
Format: Article
Language:English
Subjects:
Electric currents
Electricity distribution
Faults
Fluctuations
Harmonic analysis
Inverters
Mathematical analysis
Oscillations
Phase locked loops
Phase locked systems
Power harmonic filters
Power supply
Quantitative analysis
Reactive power
Strategy
Voltage
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Summary:Power oscillation and current quality are the important performance targets for the grid-connected inverter under unbalanced grid faults. First, the inherent reason for the current harmonic and power oscillation of the inverter is discussed with a quantitative analysis. Second, a new control strategy is proposed to achieve the coordinate control of power and current quality without the need for a phase-locked loop (PLL) or voltage/current positive/negative sequence extraction calculation. Finally, the experimental tests are conducted under unbalanced grid faults, and the results verify the effectiveness of the propose method.
ISSN:0885-8993
1941-0107
DOI:10.1109/TPEL.2014.2344098