Abstract
The instantaneous output power of the two-stage single inverter pulsates at twice the output voltage frequency, generating second harmonic current (SHC) in the input dc voltage source and the front-end dc-dc converter. To eliminate the SHC, a second harmonic current compensator (SHCC), whose input current is controlled by the improved one-cycle-control (OCC) proposed in this paper, is applied to compensate the SHC in the input of the downstream inverter. For the purpose of maximizing the direct reactive power transfer between the dc-link and the storage capacitor in the SHCC, peak voltage control is proposed to regulate the storage capacitor voltage such that power losses of the SHCC could be reduced at light load. Finally, simulation results are presented to verify the effectiveness of the proposed improved OCC on input current control and the peak voltage control on storage capacitor voltage regulation.
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