Abstract
Second harmonic output voltage ripple in a single-phase grid-connected rectifier can degrade the system performance. In this letter, a voltage-oriented state plane feedforward (VO-SPF) control is proposed to suppress the second harmonic output voltage ripple for the <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">LLC</i> converter, which serves as the back-stage of the dual-stage single-phase rectifier. Herein, the desired switching frequency of the <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">LLC</i> converter is predicted online through geometrically simplified state plane analysis, and thus the voltage control loop gain at the second harmonic frequency can be increased. The proposed control strategy features a fast dynamic response and is immune to a grid frequency deviation. Both simulation and experimental results fully confirm the theoretical analysis.
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