Abstract:
This project proposes a control for a single-phase grid-tied inverter operating in CCM and DCM to minimize inductors without increasing current THD. DCM nonlinearity compensation requires an inductance, making conventional CCM/DCM controls inductance-dependent. The proposed control compensates for DCM nonlinearity and detects current modes independently of inductance using a duty ratio from a previous calculation period. To test the control, a 4-kW 100-kHz inverter with two inductor designs is built. When the inductor impedance, normalized by an inverter impedance, is reduced from 1.8% to 0.5%, volume and material cost are reduced by 51% and 62%, respectively, and loss at 0.1 p.u. is reduced by 35%. Inductor minimization increases current THD at a rated load from 2.3% to 8.7% with conventional control, violating IEEE-1547’s grid current harmonic constraint. CCM/DCM control reduces current THD from 8.7% to 2.1%, enabling inductor minimization and grid standard compliance.
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