Temiz, HakanKeysan, OzanDemirok, Erhan2023-06-162023-06-1620201755-45351755-4543https://doi.org/10.1049/iet-pel.2019.1411https://hdl.handle.net/20.500.14365/1523An electric grid having high impedance seen from the connection point is considered as a weak grid and it adversely affects the system stability of grid-tied voltage source inverters in renewable power devices. In this study, an adaptive controller is proposed by configuring the settling time of the phase-locked loop based on the estimated grid impedance. Pseudorandom binary sequence injection and Fourier techniques are carried out for grid impedance estimation. Impedance-based stability analysis is performed for a predetermined steady-state operation point. The proposed method is verified by a 300-kVA inverter prototype for wide-range grid impedance varying from 0.3 to 3 mH.eninfo:eu-repo/semantics/closedAccessbinary sequencesinvertorspower gridsadaptive controlgrid-connected invertersweak grid conditionselectric gridhigh impedanceconnection pointgrid-tied voltage source invertersadaptive controllerestimated grid impedancegrid impedance estimationimpedance-based stability analysispredetermined steady-state operation pointpseudorandom binary sequence injectionFourier techniquesLcl-FilterIdentificationSynchronizationParametersStabilitySystemsModelArticle10.1049/iet-pel.2019.14112-s2.0-85093857766