Study of maximum power point tracking methods for photovoltaic power generation system

The output characteristic of photovoltaic array is nonlinear. Therefore, it needs to use the maximum power point tracking algorithm. The conventional perturbation and observation method is succinct and has high tracking efficiency. However, the excellent steady accuracy and dynamic property is difficult to achieve synchronously due to adopting fixed perturbation step size. An improved perturbation and observation method with variable step size is proposed in this paper. The simulation results show that the maximum power point tracking effect is good. This improved method has high steady accuracy, and it can quickly track the maximum power point.