Individual MPPT of photovoltaic arrays with use of single-phase three-level diode-clamped inverter

This paper presents the results of the investigation of the control method for realization of individual MPPT (Maximum Power Point Tracking) of photovoltaic (PV) arrays in the grid-connected PV system with a single-phase three-level diode-clamped inverter. For a system with two PV arrays the idea of control is proposed to regulate the current of each PV array independently to operate in its MPP under partial shading conditions. The method is verified using FPGA-based real-time simulations with the use of a discrete model of the power system. Such a simulation enables testing the control implemented in a dedicated hardware, such as FPGA.