Improved variable step size perturbation observation MPPT algorithm based on linear auto disturbance rejection

摘要

Aiming at the problem of low tracking accuracy and slow speed in the maximum power point tracking of photovoltaic power generation system, an improved variable step size MPPT control strategy based on linear auto-disturbance voltage closed-loop control is proposed. Taking the maximum power point tracking of the photovoltaic power generation system as the research object, the variable power step observation method is used as the power outer loop to track the maximum power point, linear auto-disturbance is used as a voltage inner loop to implement voltage feedback control. The MATLAB modeling and simulation analysis of the maximum power point tracking of the photovoltaic power generation system is carried out, and compared with the variable step size perturbation method. The research results show that the method has good adaptability, and it can improve the tracking speed and steady-state accuracy of the system in both the standard condition and the environmental abrupt situation, and greatly improve the solar energy utilization rate.