Synchronization control of single-phase full bridge photovoltaic grid-connected inverter

In this paper, the single-phase full bridge photovoltaic (PV) grid-connected inverter is introduced. Based on the working principle and circuit theory, the corresponding dimensionless mathematical model with 8-dimensions piecewise smooth state equation is established. An improved unidirectional correlation method for synchronizing the inverter to the utility grid is proposed. Analysis shows that the presented control scheme is effective and can synchronize the output current of PV inverter with the phase and frequency of utility grid by selecting appropriate correlation factor, disregarding the dynamics behavior of inverter.