Stability of voltage and frequency control in distributed generation based on parallel-connected converters feeding constant power loads
Publikation/Tidskrift/Serie: EPE Journal
Förlag: EPE Association
Övrig information: This article is an expanded version of the conference publication: P. Karlsson J. Björnstedt and M. Ström (2005), "Stability of Voltage and Frequency Control in Distributed Generation Based on Parallel-Connected Converters Feeding Constant Power Loads", EPE 2005 Conference Proceedings, Dresden, Germany, September 2005, (CD ROM pages 10).
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. The target system for the analysis is a stand-alone system to which three power electronic converters and one rotating generator could be connected (Fig. 1). Small-signal and switch-mode, time-domain simulation results of a threeconverter distributed generation system facilitating stand-alone operation verify the operation. Simulation and experimental results of a three-converter stand-alone system, with and without a rotating generator present, are also included for verification.
- Technology and Engineering
- ISSN: 0939-8368