Research on MPPT technology based on three-stage variable step size disturbance observation method

Abstract

For the traditional disturbance observation method, it is impossible to take into account both tracking speed and steady-state accuracy with a fixed step size, so we change the step size and propose disturbance observation method based on three-stage variable step size. The specific method is to set the basic step size and the slope threshold of the P-V curve, and then scale factors according to the interval segment of the slope value of the working point, so as to realize the dynamic adjustment of the step size. Simulation experiments show that after the algorithm is improved, the tracking speed is faster when the environment changes suddenly; when the environment is stable, the power oscillation is reduced. The above has certain positive significance for improving efficiency of the photovoltaic system.