PROJECT TITLE :

Improving the Stability of Cascaded DC/DC Converter Systems via Shaping the Input Impedance of the Load Converter With a Parallel or Series Virtual Impedance

ABSTRACT:

Interactions between individually designed power subsystems in a cascaded system may cause instability. This paper proposes an approach, which connects a virtual impedance in parallel or series with the input impedance of the load converter therefore that the magnitude or section of the load converter's input impedance is modified in a small range of frequency, to solve the instability problem of a cascaded system. The necessities on the parallel virtual impedance (PVI) and series virtual impedance (SVI) are derived, and the management methods to implement the PVI and SVI are proposed. The comparison and general style procedure of the PVI and SVI control methods are also discussed. Finally, considering the worst stability downside that always occurs at the system whose supply converter is an filter, 2 cascaded systems consisting of a source converter with an input filter and a load converter, that is either a buck converter or a boost converter, are fabricated and tested to validate the effectiveness of the proposed control ways.


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