In this paper we present a new approach of MRAS based on current model only. This technique aims to offsets compensating and solving problems of ordinary MRAS in low speed. Also this new approach allows us to estimate the components of the rotor flux and the rotor speed without using the voltage model. The results of the simulation and the experimental results are presented and show the effectiveness of the proposed technique.

In this paper, an efficient and fast MPPT power control of photovoltaic systems based on backstepping approach is presented. The proposed control scheme consists of two cascade loops; in the first loop, the auto-scaling variable step-size perturb and observe MPPT technique estimates the reference voltage of all electrical load values. The robust backstepping controller has been adopted to remove steady state oscillations in the second loop. Further, the performance of proposed control system has been analyzed through dSPACE DS-1104 experimental validation with Isofoton photovoltaic module under real climatic conditions at Biskra (Algeria) region. The results obtained by the used controller averred a good improvement.