An Improved MPPT Algorithm for Photovoltaic Inverter

In order to effectively solve the shock and false error in frequently used perturbation method in maximum power point tracking (MPPT) for photovoltaic inverter, the working voltage of the PV array was adjusted to 80% at the initial stage of the maximum power point tracking(MPPT), During collecting its working current and voltage, the high frequency noise was filtered by FIR filter, and the direction of disturbance was determined by three-point mode, and the step size was adjusted with the change of light intensity. The experimental analysis indicates that the stability, precision and efficiency of the improved perturbation method were developed obviously.