The aim of this work is to solve partial shading problem in solar panels to detect the global peak power point that can be used in satellite systems. This can be done by proposing a modified perturb and observe control algorithm depends on comparing all the local peak power points in photovoltaic system to detect the global one, by making initial estimation to the duty cycles of the corresponding local peak power then using perturb and observe to make fine tuning to reach the exact local peak points when oscillations happen. Also to detect the oscillations theory of operation of incremental conductance algorithm is used depending on the difference between incremental conductance and the instantaneous conductance values. The idea of operation is verified using boost converter applied in Matlab/Simulink showing good results. Also variable duty cycle is used to solve the problem of oscillations in output power.