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P. Cortes, D.O. Boillat, H. Ertl, J.W. Kolar:
"Comparative evaluation of multi-loop control schemes for a high-bandwidth AC power source with a two-stage LC output filter";
Talk: 2012 International Conference on Renewable Energy Research and Applications (ICRERA), Nagasaki, Japan,; 11-11-2012 - 11-14-2012; in: "Proceedings of the 2012 International Conference on Renewable Energy Research and Applications (ICRERA)", P. Cortes, O. Boillat, H. Ertl, J.W. Kolar (ed.); (2012), ISBN: 978-93-82242-11-6; 1 - 10.

This paper presents a comparative evaluation of
four different multi-loop control schemes for a high-bandwidth
AC power source. The power source considered in this work is
based on a three-level T-type inverter with a two-stage LC output
filter. The control schemes evaluated in this paper have an output
voltage controller in the outer loop. For the inner control loop
the following options are evaluated: capacitor current feedbacks,
proportional-integral and proportional inverter output current
control in combination with reference voltage and load current
feedforward, and first LC stage capacitor voltage and inverter
output current feedback.
The reference tracking capabilities as well as the power
source output impedance are evaluated. Analytical and simulation
results are shown to be in very good agreement, and the
frequency and step responses for the different control schemes
are compared.
The results show that a cascaded structure consisting of a
proportional-integral controller for the output voltage and a
proportional controller for the inverter output current allows
to achieve the best dynamic behavior in terms of output voltage
control bandwidth and output impedance.

http://dx.doi.org/10.1109/ICRERA.2012.6477339

http://publik.tuwien.ac.at/files/PubDat_224499.pdf