Output Voltage Regulation of Isolated PV-Connected Boost Converters with Variable Loads Using Converted Hysteresis Sliding Mode Controller

Boost converters (BCs) are main parts of Photovoltaic (PV) systems with their major role in boosting and regulating the output voltage of PV panels to facilitate a stable load/grid connection in isolated/grid-connected mode of operation. Nevertheless, the inherent variable characteristics of PV system and loads make the control of such systems challenging. In this regard, the current study proposes a new control method based on converted hysteresis sliding mode control technique (CHSMC) to address and solve this challenge. In this approach, we first develop the control law according to the hysteresis modulation concept and then extent it to the pulse width-modulation (PWM)-based SMC. This makes the design steps more straightforward and limits the control efforts and provides a fixed switching frequency SMC technique. The main feature of this approach is its robustness against simultaneous variations in both the input voltage and the load current. The simulation results using MATLAB demonstrate the qualification of the proposed approach in regulating the load voltage over the conventional perturbation ampersand observation (PO) algorithm for controlling of PV packages.