Design Of Observer-Based Nonlinear Controller For Tracking Maximum Power Point In The Solar Cell

To transfer maximum power from the solar cell to the load, a control method is used to adjust the switching signal of the boost converter. Due to the nonlinearity of the voltage-power characteristic of the solar cell and uncertainty of the electrical elements of the converters, in this paper, the sliding mode control method is used. Nonlinear controllers need to know about nonlinear functions in feedback, but this paper uses an extended state observer to estimate these functions, which are assumed to be non-measurable information. The stability of the control system has been analytically proven and the performance of the proposed observer in estimating nonlinear functions and the efficiency of the controller in tracking the reference output, which is determined by the maximum power calculation algorithm, has been evaluated by computer simulation.