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Stability of voltage and frequency control in distributed generation based on parallel-connected converters feeding constant power loads

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3 Author(s)
Karlsson, P. ; Dept. of Industrial Electr. Eng., Lund Univ. ; Bjornstedt, J. ; Strom, M.

In this paper stability and dynamic properties of voltage and frequency droop control of power electronic converters are investigated for a distributed generation system. Droop control is utilized to share active and reactive power among the source converters. The voltage and frequency controllers are designed so that stand-alone converter operation feeding constant power loads performs satisfactory. These controllers are adapted to mimic the behaviour of present rotating generators connected directly to the power system, for seam-less transfer between island and grid-connected modes of operation. Small-signal and switch-mode, time-domain simulation results of a three-converter distributed generation system facilitating stand-alone operation verify the operation. Experimental results of a three-converter stand-alone system are also included for verification

Published in:

Power Electronics and Applications, 2005 European Conference on

Date of Conference:

11-14 Sept. 2005