Maximum power point tracking method for the voltage-mode grid-connected inverter of photovoltaic generation system

A novel maximum power point tracking (MPPT) method for the voltage-mode grid-connected inverter of photovoltaic generation system is proposed in this paper. The proposed MPPT method incorporated in the controller of the voltage-mode grid-connected DC/AC inverter is used to track the maximum power of solar cell array by monitoring the output voltage of the solar cell array. The main feature of the proposed method is that no current is sensed for MPPT. Therefore, it has the advantage of simplifying the control circuit in comparison with the conventional perturbation and observation methods where both current and voltage are sensed. A prototype based on the DSP controller is developed and tested to verify the performance of the proposed MPPT method. The experimental results show that the proposed method has the expected performance.