Control techniques and synchronization methods for grid-connected renewable energy systems - A survey
DOI:
https://doi.org/10.5433/1679-0375.2017v38n1p63Keywords:
Renewable sources, current control, grid-connected inverter, PLLAbstract
Renewable Energy Systems have become an attractive alternative to the conventional energy sources, due the necessity of energetic matrix diversification in order to ensure the supply of the future electricity demand in a sustainable way. The renewable sources need energy conversion equipment with suitable control in order to achieve a satisfactory grid-tied operation. The control must ensure the synchronization with the grid and the sinusoidal current injection in order to meet the international power quality standards. This work provides an overview of the main current control strategies for Renewable Energy Systems, and grid synchronization methods presented in the literature. Linear and non-linear current control techniques are covered regarding different reference frames, and single phase and three phase synchronization methods are presented as well.
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