Research and Improvement of Perturbation and Observation Method in Photovoltaic Power System

In order to improve the efficiency of photovoltaic array, which need maximum tracing power. Perturbation and observation method has become one of the algorithm of the wide range research because of its simple and easy. But the traditional P&O will be oscillation in near the maximum power point due to its fixed step disturbance and leads to some loss of power and in certain circumstances and incorrect judgment will be in steady state. In order to overcome these shortcomings, a variety of improved methods are proposed, and the main improvements of those are summarized. Some simulation experiments have been done for these methods, and these methods are proved to be feasible.