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http://dx.doi.org/10.6113/TKPE.2022.27.2.134

Alleviate Current Distortion of Dual-buck Inverter During Reactive Power Support  

Han, Sanghun (Dept. of Electronic Electronics Engineering, Konkuk University)
Cho, Younghoon (Dept. of Electrical and Electronics Engineering, Konkuk University)
Publication Information
The Transactions of the Korean Institute of Power Electronics / v.27, no.2, 2022 , pp. 134-141 More about this Journal
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.
Keywords
Photovoltaic inverter; Dual-buck inverter; Zero-crossing distortion; Reactive power capability;
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