| dc.description.abstract | Due to complexity of electrical power system netvvork, the assurance of uninterrupted
supply of electrici,ty and quality power has become the main challenge for the
diiiribution system. The fluctuation of system voltage, frequency as well as real and
reactive power hampers the system stability which jeopardizes uninterrupted supply of
electricity to the consumers. Utility distribution netvvorks, sensitivity industrial loads and
critical commercial operations suffer from various types of outages and service
interruptions which can cost significant financial losses. The voltage sag and swell are
the most important power quality problems which are seen in industrial and commercial
installations. For improving power quality at the distribution network, various FACTS
(/texible AC transmission system) deyices like D-STATCOM (dynamic static synchronous
compensator), DI/R (dynamtc voltage restorer), SVC (static YAR compensator) and
others are used. The D-STATCOM (distribution static compensator) is now replacing
other FACTS devices in the distribution system for its better performance than others.
The D-STATCOM has the capability of instantaneous system voltage improvement in
case of voltage sag andflicker within the distribution system. The design of the control
system is the main aspect of the D-STATCOM. In this paper, a 6 pulse D-STATCOM
model is designed and simulated by using PSCAD/EMTDC for improving of distribution
system stability by mitigation of uoltage dips. The PI controller is used for controlling the
voltage and reactive power flow to and from the DC capacitor of the D-STATCOM. The
PLL (phase locked loop) is usedfor controlling the gate triggering pulses ofIGBT based
VSC (voltage source converter) of the D-STATCOM by using PWM (pulse width
modulation) | en_US |
