Multi-frequency Power Transfer by Single-Phase Grid-Connected Converters

In this paper, the possibility of single-phase multi-frequency power transfer is investigated. This task is performed by using single-phase grid-connected converters. The active and reactive powers can be transferred separately and bidirectionally at different frequencies. The control system controls the powers and currents of the converters. For doing so, the frequencies are decoupled by using a MSOGI-FLL + HDN block for each input signal of the control system and they are converted to alpha-beta coordinates. Additionally, the PR current controller is used for each frequency of the signals so that they control each component of the converter currents independently.