A case study of voltage sag analysis in a utility distribution system

Voltage sags are momentary dips in voltage magnitude that can cause sensitive equipments to trip. Such occurrences have a major economic impact and therefore, the study of voltage sag has become a major effort worldwide. This paper presents a voltage sag analysis implemented on an actual distribution system. The objective of the study presented in this paper is to develop a suitable method for voltage sag analysis in which the method is demonstrated on a practical distribution system. The voltage sag analysis is performed using the commercial software PSS/ADEPT for performing load flow and short circuit simulations. The distribution network is modeled using the actual network data and the transmission system is considered as a source. Faults are introduced at various points in the system, at the buses and along the lines. Simulation results are presented in the form of voltage sag vulnerability areas.

[1]  J. Pellis,et al.  A voltage sag study in a large industrial distribution system , 1996, IAS '96. Conference Record of the 1996 IEEE Industry Applications Conference Thirty-First IAS Annual Meeting.

[2]  Math Bollen,et al.  Characteristic of voltage dips (sags) in power systems , 2000 .

[3]  M. J. Samotyj,et al.  Voltage sags in industrial systems , 1991, Conference Record. Industrial and Commercial Power Systems Technical Conference 1991.

[4]  C. Radhakrishna,et al.  Impact of voltage sags in practical power system networks , 2001, 2001 IEEE/PES Transmission and Distribution Conference and Exposition. Developing New Perspectives (Cat. No.01CH37294).

[5]  K. M. Nor,et al.  Electronic process equipment compatibility evaluation project for power quality enhancement-a Malaysian experience , 2001 .

[6]  Mohd Ruddin Ab Ghani,et al.  Voltage sag: Malaysian's experience , 1998, POWERCON '98. 1998 International Conference on Power System Technology. Proceedings (Cat. No.98EX151).