The Research of Maximum Power Point Tracking ...

The paper analyses the voltage-current characteristics of photovoltaic (PV) cells to study the maximum power point tracking control algorithm. This article proposes a kind of improved maximum power point tracking control algorithm for PV cells, based on nearly linear dP/dU and I as well as PV array operating at stable area. A new judegment condition to confirm the maximum power point is researched in the algorithm, which combines constant voltage method with perturbation-observation method. The stability of PV system is improved compared with traditional perturbation-observation method. The algorithm is theoretically derived and simulated by MATLAB. The results of simulation show that this new algorithm can eliminate oscillation near the maximum power point.