Abstarct: In this thesis, using robust adaptive control system is controlled SEPIC converter. SEPIC converter with respect to the features that are used in photovoltaic systems. This converter is used for medium state equations modeling. Considering the nonlinear characteristics, noise and disturbance, not the model dynamics, changes in input voltage system, there are limitations to determine the controller. Classical linear controllers so that performance is not appropriate. For this purpose, the model reference adaptive controller is designed for converter system and then using indirect self-regulating controller is designed as a robust adaptive. At the end of robust adaptive controller, the converters apply the original system and the simulation results show the effectiveness of the controller.