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H. Ertl, J.W. Kolar, G. Morauf, F. Zach:
"Analysis of Active Ripple Current Compensators Employing Multi-Cell Switch-Mode Amplifier Topologies";
Poster: PCIM (Power Conversion, Intelligent Motion, Power Quality), Nürnberg, D; 14.05.2002 - 16.05.2002; in: "Proceeding", (2002), S. 125 - 131.

Abstract - In this paper an active ripple current compensator
for improving the EMC behavior of mains connected PWM
converters is analyzed. The proposed compensation system is
formed by a multi-level multi-cell switch-mode amplifier
connected in parallel to the pulse width modulated main
converter which neutralizes the switching frequency current
components of the main converter in order to significantly
improve the mains voltage quality at the point of common
coupling of the total system. With the proposed active system
the application of bulky and expensive EMC filters which
further show remarkable additional losses can be avoided to a
large extent. The paper describes the operating and control
principle, analyzes the compensation behavior as well as the
control required for covering the losses of the compensator.
Furthermore, guidelines for dimensioning and realization of the
transducer required to determine the ripple of the main
converter and considerations to realize this sensor/filter-device
using a modified (air gapped) current transformer are given.
Finally, an easy to implement circuit scheme to perform the
required interleaved mode modulation of the multi-cell switch-mode
amplifier is presented and analyzed.