Optimized control of isolated residential power router for photovoltaic applications

This paper proposes an optimized control of the hardware of a residential power router for photovoltaic applications. The design of the hardware topology is described in this paper. Solar panels, which act as the green power input, are connected through a boost converter to an isolated dual-half-bridge and integrated with a full-bridge inverter to provide a 60 Hz voltage at the ac bus to supply traditional residential loads. The proposed maximum power point tracking control for photovoltaics begins with constant voltage tracking and then adopts a variable duty cycle step-size perturbation and observation to improve the accuracy of the photovoltaics power tracking. Furthermore, to significantly reduce the voltage error for the grid-tied inverter, the proposed direct quadrature (D-Q) rotating frame control provides much better performance over a normal proportional-integral-derivative (PID) control. Simulation and experimental results reported in this paper verify the functionality of the hardware topology of the power router system and its optimized controller.