“…Thus, under different loads, the duty cycle can be adjusted to change R in to match R opt at any cli- matic condition. Several methods are proposed for MPPT algorithm: system oscillation [1], look-up table [3], fractional open-circuit voltage [4], fractional short-circuit current [5,6], current sweep [7], perturbation and observe (P&O) [8], Hill Climbing [9][10][11], conductance incremental [12][13][14], a biological swarm chasing algorithm [15], Ripple correlation control [16], fuzzy logic control [17,18] and neural network [19]. However, the parameters' sizing of the different topologies of DC-DC converters has not been studied widely although this sizing affects significantly the optimum operation of the PV systems.…”