Cost-effective solution for microgrid power quality assurance

In this paper, an optimum interface configuration is proposed which can be used for connecting a microsource to a weak utility. The proposed configuration simultaneously conditions the quality of the power delivered to the supplied loads in the microgrid. This system employs a recently introduced reduced switch count dual-output inverter in a mode of operation named Equal Frequency which offers the best operation features such as maximum dc bus voltage utilization and minimum device ratings. Compared to the counterpart system, the proposed configuration enjoys an integrated structure and less number of semiconductor switches while possessing the same principal characteristics such as ability to compensate unbalanced and distorted utility or the ability to supply three-phase unbalanced loads with balanced and ceaseless voltage. The proposed system is developed, its carrier based modulation scheme is elaborated and a simple control strategy is devised for it. The validity of operation of the proposed system is verified through simulation.