| Title |
Alleviate Current Distortion of Dual-buck Inverter During Reactive Power Support |
| Authors |
Sanghun Han ; Younghoon Cho |
| DOI |
https://doi.org/10.6113/TKPE.2022.27.2.134 |
| Keywords |
Photovoltaic inverter; Dual-buck inverter; Zero-crossing distortion; Reactive power capability |
| Abstract |
This study presents a method for reducing current distortion that occurs when a dual-buck inverter generates reactive power. Dual-buck inverters, which are only capable of unity power factor operation, can generate reactive power capabilities by modifying a modulation technique. However, under non-unity power factor conditions, current distortion occurs at zero-crossing points of grid voltage and output current. This distortion is caused by parasitic capacitors, dead-time, and discontinuous conduction mode operation. This study proposes a modified modulation method to alleviate the current distortion at zero-crossing point of the grid voltage. A repetitive controller is applied to reduce this distortion of the output current. A 1 kVA prototype is built and tested. Simulation and experimental results demonstrate the effectiveness of the proposed method. |