Passivity-based control of a hybrid asymmetric nine-level inverter

In this paper the problem of achieving a low current Total Harmonic Distortion for a low voltage single phase non-linear load, using the Passivity Based Control applied to a hybrid asymmetric nine-level inverter is shown. The controller was designed taking account of the passivity properties of the averaged state model. A simulation study was carried out in order to evaluate the performance of the control designed by the passivity approach. The simulation results show the low current THD reached in the current injected to the electrical system when the inverter is used to compensate the current harmonics of the non-linear devices. The main contribution of this paper is the calculation of two laws that allow to control two converters at different switching frequencies.