1MHz sampling high-speed single-phase PLL control using FPGA based hardware controller

In the utility interactive system, the inverter output voltage has to synchronize to the a utility grid. In the case of a single phase system, it is difficult to detect the instantaneous phase angle of the utility voltage. A new high-speed single phase PLL control for the single phase utility interactive inverter system is proposed. Quasi d-q transformation and LPF function are applied to construct the PLL control with 1MHz multi sampling parallel processing method based on FPGA base hardware controller. Evaluations were carried out with simulations. Very fast detection response was achieved with stable transient operations.