Sliding mode control, implementation and performance analysis of standalone PV fed dual inverter

Abstract

Abstract This paper presents the development and implementation of an enhanced forced switching sliding mode control (FSSMC), for dual inverter-based single stage solar photovoltaic (PV) system a stand-alone. A dual inverter fed open winding three-phase transformer is used to supply a stand-alone load in the considered topology. The FSSMC is developed for the current control of the dual inverter, while the dc-link voltage control loop is developed through indirect vector control. The solar irradiance and load impedance variations are successfully handled by the developed control scheme. The stability and disturbance rejection analyses are conducted on a linear model of the system to characterize the dynamic properties of the system and to evaluate the robustness of the controllers. The controller is implemented in simulation and experimental environments at different operating conditions. Experimental tests have been conducted on a laboratory scaled prototype using the digital controller. The performance is found to be satisfactory and have been successfully verified with the real time results.