Power Sharing Management of a PEC9-based Microgrid by Feedback-Feedforward Control Strategy

Multilevel converters can be considered as a worthy alternative for microgrid applications because of their abilities at reaching more active and reactive power generation as well as more suitable power quality enhancement. In this paper, two parallel 9-level Packed E-Cell (PEC9) inverters are utilized to form a grid-connected microgrid with LCL filter. Based on the microgrid specifications, the dynamics of the PEC9 output currents and C filter voltages in d-q reference frame are incorporated in a feedback-feedforward control strategy to manage the power sharing of the inverters for grid stability and unity power factor. The proposed control technique is evaluated through the PEC9 output current-based transfer functions to achieve effective control coefficients. The microgrid system is assessed by Matlab/Simulink environment under load variations to verify the proposed control strategy abilities.