An interface converter for DG/storage system able to improve power quality of the load

In this work the authors want to provide a complete study on an interface of a DG/storage system realized with an inverter and a static switch for single phase systems. In particular this paper presents a control strategy for a DG/storage system application using voltage source inverter as interface for network connection able to improve the power quality level of the network and the customer supply. Under particular consideration the Italian standard CEI EN 11-20 requirements have been taken. The whole system is coupled with the point of common coupling (PCC) by a LC filter for reducing current ripple at switching frequency, 8 kHz, and by an isolating transformer in order to match standard requirements. All the complete device has been theoretically analyzed and simulated. The experimental results reported in the paper validate the strategy proposed and show the rightness of chooses done.