IEEE Electrification Magazine - September 2017 - 67

33

Nominal Converter Versus
Test Case 1-After Control Adaptation
Nominal
Increased Cout

Output Voltage (V)

32.5
32
31.5
31
30.5
30

0.52

0.515

0.51

0.505

0.5

0.495

0.49

0.485

0.48

0.47

29

0.475

29.5

Time (s)
Figure 23. The output-voltage-reference step response for Case 1
after the control adaptation.

together with the nominal response. As can be seen, the
response for the off-nominal case is very lightly damped
and oscillatory. The identified and fitted control-to-output
frequency response of the system for this case is shown
in Figure 22. As compared to the nominal case (not shown
here), the frequency response features a lower filter corner
frequency and higher Q, which is consistent with the
obtained time-domain response of Figure 21. Once the controller gets updated by the adaptively synthesized control
gains, the response to a step in the output reference is
shown in Figure 23. A significant improvement can be
observed, which demonstrates the effectiveness of the
implemented adaptive controller.

Acknowledgments
This work was supported by the Office of Naval Research
under grant N00014-14-1-0165 and by the Bundesministerium fuer Bildung und Forschung-German Federal Ministry of Education and Research (BMBF) under promotional
reference 03EK3566B.

For Further Reading
N. Doerry, "Naval power systems: Integrated power systems
for the continuity of the electrical power supply," IEEE Electrific. Mag., vol. 3, no. 2, pp. 12-21, June 2015.
S. D. Sudhoff, S. F. Glover, S. H. Zak, S. D. Pekarek, E. J. Zivi,
D. E. Delisle, and D. Clayton, "Stability analysis methodologies
for dc power distribution systems," in Proc. 2003 13th Int. Ship
Control Systems Symp. (SCSS), Orlando, FL, Apr. 2003.
M. Cupelli, F. Ponci, G. Sulligoi, A. Vicenzutti, C. S. Edrington, T. El-Mezyani, and A. Monti, "Power flow control and network stability in an all-electric ship," Proc. IEEE, vol. 103, no. 12,
pp. 2355-2380, Dec. 2015.
A. Riccobono and E. Santi, "Comprehensive review of
stability criteria for dc power distribution systems," IEEE
Trans. Ind. Appl., vol. 50, no. 5, pp. 3525-3535, Sept.-Oct.
2014.
K. R. Godfrey, Perturbation Signals for System Identification.
Englewood Cliffs, NJ: Prentice Hall, 1993.

A. Riccobono, E. Liegmann, A. Monti, F. Castelli Dezza, J.
Siegers, and E. Santi, "Online wideband identification of threephase ac power grid impedances using an existing grid-tied
power electronic inverter," in Proc. 2016 IEEE 17th Workshop on
Control and Modeling for Power Electronics (COMPEL), Trondheim,
Norway, pp. 1-8.
T. Roinila, M. Vilkko, and T. Suntio, "Frequency response
measurement of switched-mode power supplies in the presence of nonlinear distortions," IEEE Trans. Power Electron.,
vol. 25, no. 8, pp. 2179-2187, Aug. 2010.
T. Roinila, M. Vilkko, and J. Sun, "Online grid impedance
measurement using discrete-interval binary sequence
injection," IEEE J. Emerg. Sel. Topics Circuits Syst., vol. 2, no. 4,
pp. 985-993, Dec. 2014.
E Santi, H Y. Cho, A B. Barkley, D Martin, and A Riccobono,
"Tools to address system level issues in power electronics:
The digital network analyzer method and the positive
feedforward control technique," in Proc. Int. Conf. Power Electronics (ICPE) Energy Conversion Congr. Exposition (ECCE) Asia,
Jeju, Korea, May-June 2011, pp. 2106- 2113.
A. Barkley and E. Santi, "Online monitoring of network
impedances using digital network analyzer techniques," in
Proc. IEEE Applied Power Electronics Conf. (APEC), Washington,
D.C., Feb. 2009, pp. 440-446.
A. Barkley, R. Dougal, and E. Santi, "Adaptive control of
power converters using digital network analyzer techniques,"
in Proc. IEEE Applied Power Electronics Conf. (APEC), Fort Worth,
TX, Mar. 2011, pp. 1824-1832.
D. S. Parker and C. G. Hodge, "The electric warship [electric
propulsion]," Power Eng. J., vol. 12, no. 1, pp. 5-13, Feb. 1998.
M. Morari and E. Zafiriou, Robust Process Control, vol. 488.
Englewood Cliffs, NJ: Prentice Hall, 1989.

Biographies
Antonino Riccobono (ariccobono@eonerc-rwth-aachen.de)
is with the Institute for Automation of Complex Power
Systems, E.ON Energy Research Center, RheinischWestfälische Technische Hochschule Aachen University, Germany.
Marco Cupelli (mcupelli@eonerc-rwth-aachen.de) is
with the Institute for Automation of Complex Power Systems, E.ON Energy Research Center, Rheinisch-Westfälische
Technische Hochschule Aachen University, Germany.
Antonello Monti (amonti@eonerc-rwth-aachen.de) is
with the Institute for Automation of Complex Power Systems, E.ON Energy Research Center, Rheinisch-Westfälische
Technische Hochschule Aachen University, Germany.
Enrico Santi (santi@cec.sc.edu) is with the Department
of Electrical Engineering, University of South Carolina,
Columbia.
Tomi Roinila (tomi.roinila@tut.fi) is with the Tampere
University of Technology, Finland.
Hessamaldin Abdollahi (abdollh@email.sc.edu) is with
the Department of Electrical Engineering, University of
South Carolina, Columbia.
Silvia Arrua (sarrua@email.sc.edu) is with the Department of Electrical Engineering, University of South Carolina, Columbia.
Roger A. Dougal (dougal@cec.sc.edu) is with the Department of Electrical Engineering, University of South
Carolina, Columbia.
IEEE Elec trific ation Magazine / S EP T EM BE R 2 0 1 7

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