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M.L. Heldwein, H. Ertl, J. Biela, J.W. Kolar:
"Implementation of a Transformerless Common-Mode Active Filter for Offline Converter Systems";
IEEE Transactions on Industrial Electronics, 57 (2010), 5; S. 1772 - 1786.

This paper presents a study and practical implementation
of an active filter employing a high-frequency (HF) power
amplifier and passive-filter components to be connected to the ac
power lines in order to mitigate common-mode conducted emissions
of three-phase pulsewidth modulation converter systems.
The filter topology is chosen from different possibilities listed in
a literature survey and studied regarding practical implementation
issues, where requirements for an HF power amplifier to be
applied in active filtering are derived. Special attention is put on
the stability analysis where the challenges for the feedback are
discussed, and a simple feedback structure is proposed. Other
feedback concepts are analyzed, and limitations posed by stability
requirements are presented. A prototype is designed and built,
from which mathematical and experimental results are obtained
demonstrating the potential and limitations of such a system.

http://publik.tuwien.ac.at/files/PubDat_186992.pdf