Analysis of effects of synchronism conditions on power system operation

A power grid might be separated into several independent subsystems when the system suffers from major events. Conditions for parallel resynchronization operation of separated subsystems sometimes cannot be satisfied due to various problems. The main purpose of this paper is to analyze the effects of the differences between the frequencies, voltages, and/or phase angles of the two subsystems to be synchronously parallelized. Moreover, the allowed range of these differences and the methods for reducing these differences are studied. Also compared are the cases with two different points of parallel switching. The results are expected to be helpful with improving the system performance during parallel switching operation in order to recover the power system from emergency conditions.

[1]  J.A. Ferreira,et al.  Grid-connected and islanded operation of a hybrid power system , 2007, 2007 IEEE Power Engineering Society Conference and Exposition in Africa - PowerAfrica.

[2]  Zhencun Pan,et al.  An Integrated Automatic Control System for Distributed Generation Hierarchical Islanding , 2006, 2006 International Conference on Power System Technology.

[3]  G.T. Heydt,et al.  Impact of interconnection of distributed generation of electric distribution systems - a dynamic simulation perspective , 2006, 2006 IEEE Power Engineering Society General Meeting.

[4]  N.T. Stringer.  Voltage considerations during generator synchronizing , 1998, Conference Record of 1998 IEEE Industry Applications Conference. Thirty-Third IAS Annual Meeting (Cat. No.98CH36242).

[5]  Fu Wang.  Review of islanding detection methods for distributed generation , 2011 .

[6]  J. B. Davies,et al.  System islanding considerations for improving power system restoration at Manitoba Hydro , 2002, IEEE CCECE2002. Canadian Conference on Electrical and Computer Engineering. Conference Proceedings (Cat. No.02CH37373).