Maintaining PCC voltage in a Distributed Generation system even during power output fluctuation and unbalanced voltage conditions

This paper proposes a new PCC voltage control algorithm for DG which takes advantage of maintaining the PCC voltage regardless of whether DG outputs an active power or not. In this method, even during unbalanced voltage conditions of the PCC voltage, DG plays the role for compensating the PCC voltage. DG uses a reactive current for keeping the PCC voltage within a normal range and a negative sequence current for reducing the PCC voltage unbalance. The proposed method is verified by the PSIM simulation and experimental results.