A Robust DC-Split-Capacitor Power Decoupling Scheme for Single-Phase Converter

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Abstract
Instead of bulky electrolytic capacitors, active power decoupling circuit can be introduced to a single-phase converter for diverting second harmonic ripple away from its dc source or load. One possible circuit consists of a half-bridge and two capacitors in series for forming a dc-split capacitor, instead of the usual single dc-link-capacitor bank. Methods for regulating this power de-coupler have earlier been developed, but almost always with equal capacitances assumed for forming the dc-split capacitor, even though it is not realistic in practice. The assumption should hence be evaluated more thoroughly, especially when it is shown in the paper that even a slight mismatch can render the power decoupling scheme ineffective and IEEE 1547 standard to be breached. A more robust compensation scheme is thus needed for the dc-split-capacitor circuit, as proposed and tested experimentally in the paper.

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