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http://dx.doi.org/10.6113/TKPE.2020.25.2.73

Reactive Power Control of Single-Phase Reactive Power Compensator for Distribution Line  

Sim, Woosik (Dept. of Electrical Engineering, Chungnam National University)
Jo, Jongmin (Dept. of Electrical Engineering, Chungnam National University)
Kim, Youngroc (Hex Power System)
Cha, Hanju (Dept. of Electrical Engineering, Chungnam National University)
Publication Information
The Transactions of the Korean Institute of Power Electronics / v.25, no.2, 2020 , pp. 73-78 More about this Journal
Abstract
In this study, a novel reactive power control scheme is proposed to supply stable reactive power to the distribution line by compensating a ripple voltage of DC link. In a single-phase system, a magnitude of second harmonic is inevitably generated in the DC link voltage, and this phenomenon is further increased when the capacity of DC link capacitor decreases. Reactive power control was performed by controlling the d-axis current in the virtual synchronous reference frame, and the voltage control for maintaining the DC link voltage was implemented through the q-axis current control. The proposed method for compensating the ripple voltage was classified into three parts, which consist of the extraction unit of DC link voltage, high pass filter (HPF), and time delay unit. HPF removes an offset component of DC link voltage extracted from integral, and a time delay unit compensates the phase leading effect due to the HPF. The compensated DC voltage is used as feedback component of voltage control loop to supply stable reactive power. The performance of the proposed algorithm was verified through simulation and experiments. At DC link capacitance of 375 uF, the magnitude of ripple voltage decreased to 8 Vpp from 74 Vpp in the voltage control loop, and the total harmonic distortion of the current was improved.
Keywords
Reactive power; DC link voltage; Distribution line; Ripple voltage; 2nd harmonic;
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