A DSP-based single-stage maximum power point tracking PV inverter

This paper presents the design and implementation of a DSP-based single-stage photovoltaic (PV) inverter system which can extract maximum power from solar panel. A perturbation and observation (P&O) method is realized and cooperated with a digital unipolar voltage switching sinusoidal pulse width modulation. The studied single-stage topology provides the benefits of low cost, simple configuration and good overall efficiency compared with the conventional two-stage structure. Moreover, this paper also presents a new current sensing technique for maximum power point tracking (MPPT) to enhance the system flexibility and MPPT accuracy. A prototype system is implemented and tested. The experimental results are shown to verify the feasibility of the proposed scheme.