An Adaptive Unified Seamless Control Strategy for Distributed Generator Inverter

Most of Distributed Generators (DGs) use Voltage Source Inverter (VSI) for the purpose of interfacing DG with the grid and producing electricity at the desired voltage and frequency. This paper presents adaptive unified seamless control strategy for a DG based controller. The parameters of the Proportional-Integral (PI) controller are updated online utilizing the Set-Membership Affine Projection Algorithm (SMAPA) to cope with disturbances and sudden changes that may occur. The proposed SMAPA based adaptive controller is used for unified load current control strategy for the VSI to achieve seamless transitions from grid connected to islanded mode and vice versa. The proposed system is simulated using PSCAD/EMTDC software package to evaluate the dynamic performance of the proposed SMAPA based adaptive controller.