Study on Optimal Design and Control for a Multilevel Active Power Decoupling Circuit
In single-phase high power-factor applications,including AC/DC and DC/AC converters,there can be generated high double line frequency current ripple in the DC bus,and large capacitance are required to absorb this low-frequency ripple.Though conventional two-level active power decoupling(APD)circuit can effectively absorb this ripple,the inductor size is still large.This paper proposes an optimal design method for multi-level APD circuit,which can mini-mize volume with a given power loss expectation.Based on flying-capacitor multilevel(FCML)topology,a control strate-gy that can limit harmonic content and balance voltage of flying-capacitors is proposed.A 7-L half-bridge circuit are simu-lated to verify the proposed design method and the control strategy.
FCML converteractive power decouplinglow-frequency ripple
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