Control strategy for an interface to improve the power quality at the connection of AC microgrids

In this paper, a control strategy is proposed for an interface which is connected between a microgrid and main grid. The interface is based on an active power filter configuration of series connection. The proposed control strategy allows mitigating of current harmonics and reduction of voltage unbalances that may appear at the microgrid side and/or at the network side. The proposed strategy was verified by simulation. To do this, a simulation platform based on MATLAB-Simulink was developed. The interface was subjected to voltage unbalances and current harmonics produced at the microgrid side and main grid side. The results obtained demonstrate the validity of the designed interface with the proposed strategy.