*
Corresponding author: Murat Mustafa Savrun, Adana Science and Technology University, Department of
Electrical-Electronics Engineering, 01250 Adana, Turkey, E-mail: msavrun@adanabtu.edu.tr
1
Adana Science and Technology University, Electrical-Electronics Engineering 01250 Adana, Turkey
2
Çukurova University, Electrical-Electronics Engineering 01330 Adana, Turkey
3
Adana Science and Technology University, Automotive Engineering 01250 Adana, Turkey
4
Ankara Yıldırım Beyazıt University, Energy Systems Engineering 06760 Ankara, Turkey
Copyright © JES 2018 on-line : journal/esrgroups.org/jes
Murat Mustafa
Savrun
1,*
,
Adnan Tan
2
,
Tahsin Köroğlu
3
,
Mehmet Uğras
Cuma
1
, Kamil
Çağatay Bayındır
4
,
Mehmet Tümay
1
J. Electrical Systems 14-1 (2018): 174-187
Regular paper
!
!" !
# # $ #
" % $ $ !
&
’ $ " (
$ !
" ) *+ , #
- " .$
!"
Keywords: Voltage Sag; Voltage Swell; Disturbance Generator.
Article history: Received 4 January 2018, Accepted 6 February 2018
1. Introduction
Voltage sags are considered one of the most encountered power quality problems in
power systems. Voltage sag is a momentary decrease in the rms voltage between 0.1pu and
0.9 pu (10%–90% of the nominal voltage) at the power frequency of duration from 0.5
cycles to a few seconds. They may be caused by natural events (lightning or freezing),
switching operations of power electronic equipment, nonlinear characteristics of loads and
fault currents. The voltage swell is a power quality problem but it is not encountered as
frequently as the voltage sag. Voltage swell is a momentary increase to between 1.1pu and
1.8 pu in the rms ac voltage (110% of the nominal voltage) at the power frequency of
duration from 0.5 cycles to a few seconds. They may be triggered on the unfaulted phase by
occurred faults on the other phases. Voltage sags and swells may damage a large number of
voltage-sensitive loads, cause a shutdown of a process and cause high economic hardship
[1-4].
In order to mitigate the effects of voltage sags and swells on the voltage sensitive users,
sag compensating devices such as DVR, UPS, static series compensator (SSC) etc. are
inserted to the power systems. It is important to test the performance of these compensating
devices under various voltage sag and swell conditions. The performance analysis of the
devices must be carried out for diverse sag/swell duration, depth and point of initiation. A