Abstract
Active decoupling methods are developed for tackling the inherent second-order ripple power. However, in all the active decoupling methods developed for single-phase current source rectifier (SCSR), the dc output voltage is limited to half the peak amplitude of the ac source voltage. That limits SCSR's wide applications. Addressing that issue this study proposes a family of two-port switching networks (TSNs) to achieve ripple power decoupling and output voltage step-up at the same time. The main circuit is formed by inserting the TSN into the dc link of a conventional SCSR. Compared with the most existing SCSRs with decoupling capability, no extra semiconductor devices are added. Related operating principle and modulation scheme are described first. Then the selection of the decoupling capacitance is discussed. A closed-loop control strategy is also introduced to achieve good compensation performance. Finally, simulations and experimental results are presented to show the effectiveness.
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