Using virtual impedance network to improve the control performances of LCL-type grid-connected inverter under the weak grid condition
作者： Dongsheng Yang , Xinbo Ruan , Heng Wu
DOI: 10.1109/APEC.2014.6803739
关键词:
摘要: Under the high penetration of renewable energy, power grid may features as weak grid, which contains a large set impedance values and varies harmonics. The grid-connected inverter can be greatly challenged by this condition when it is operated interface to inject generated into grid. Particularly, stability problem aroused injected current distorted voltage Luckily, output give an insight stable robustness harmonic rejection ability control system, so relationships between them are investigated in paper. Based on which, virtual network proposed provide additional degrees freedom for optimization. With method, exhibits against grid-impedance variation also performs strong background harmonics at same time. Experimental results from LCL-type single-phase confirm theoretical expectations effectiveness solutions.
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