Controllable AC/DC Integration for Power Quality Improvement in Microgrids
Abstract
Renewable energy sources can be connected to utility grids by using AC
and DC integration methods. The AC integration is a practical and
cost-effective method thanks to its simple structure; however, its power
quality protection is weak. The DC integration method provides high
power quality to microgrids owing to extra AC/DC voltage conversion, but
its power efficiency is lower than that of the AC integration method.
This paper presents a controllable AC/DC integration method combining
the advantages of both AC and DC integration methods. In the proposed
method, AC integration is activated to provide high integration
efficiency at times when the power quality of the utility grid is
suitable. At other times when the power quality of the utility grid is
unsuitable, DC integration is activated to improve the power quality of
the microgrids. The proposed method was modeled and tested using
Matlab/Simulink simulation environment. In the model, voltage sag and
current harmonic distortion were used as destructive effects for the
electrical energy of the utility grid. Results indicate that transitions
between AC and DC integration modes are reliable in terms of voltage and
current standards.
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