Design of Control Strategy of DC/AC Converter for Grid Connected PV System

The renewable centred power generation grows rapidly as nation modernizes and solar plays vital role here. As PV generation is highly dominated by its atmospheric conditions, an MPPT technique is looked for efficient power generation. In this proposed scheme, P&O based MPPT technique is chosen to track the maximum power point. In this paper, a control strategy is proposed for inverters of single phase grid connected PV system. Voltage and Current control of grid tied with PV inverter is included in this control technique. The frequency and amplitude of the output voltage is controlled by grid in grid connected mode and current controlled mode is preferred for PV inverter operation. The PV inverter generates excess energy is supplied to the grid in light loaded condition and both PV inverter and the grid met the load demand in overloaded conditions (critical atmospheric conditions) in the current controller for grid connected mode. A phase locked loop (PLL) based on dual transport delay is mainly for synchronizing the PV inverter and the grid. This proposed strategy is verified by using Matlab/Simulink software.