Optimized parallel DG with fuzzy logic based on adaptation impedance

The use of Distributed Generator (DG), or inverter in parallel forms for the feed of a common load has significant role in the increase of feed reliability. In the use of this technology, the imbalance effect and unequal impedance effects of the lines connected between the inverters and load results in circulating currents between inverters. This leads to the limitation of the capacity of the lines and affects the optimum use of the inverter capacity. To get rid of this problem, virtual impedance technique and suitable control methods consisting of active and reactive power determining loops as well as inverter switching reference voltage for the conformity of the impedance lines are used. In order to impose suitable control, the fuzzy control method is used which benefits from better and more real functioning compared to PI classical controller.