Instantaneous control of average power for grid tie inverter using single phase D-Q rotating frame with all pass filter

This paper proposes a new instantaneous power control method using the rotating frame with an all pass filter for a single-phase grid tie inverter. The recently proposed single-phase rotating frame is reanalyzed based on the phasor notation that has been widely used to understand linear electrical circuits and then the relationship between them is defined. A grid tie inverter circuit model with a LCL filter is derived in a single-phase rotating frame. A novel average power control method with an all pass filter suitable for digital implementation is introduced. Various results from simulations are shown to verify the proposed scheme and actual experiments taken from a 3 kW grid tie inverter will be carried out in a near future.