This paper suggests improving the quality and performance of electrical grid by using Four
Chopper circuit in the DC –Link of the variable speed drive system with 12 pulse rectifier.
In addition, it analyses the effects on the ripple factor for bot
h current and voltage in DClink
and improving the system's stability.
For this study a variable speed drive system has been simulated and designed with the
proposed chopper and 12 pulse rectifiers. In order to confirm the ability of Using four -
quadrant chopper with rectifier circuits and its ability to improve the stability of the power
systems, a variable speed system has been simulated
Finally, A discussion of the results was introduced. The giving results show the advantages
of using the proposed chopper with variable speed drive systems.
In this paper, we have suggested the STATCOM
(STATic synchronous COMpensator) to connect PV-solar (or
wind) frame to the power system for the Hassia industrial city
which we chose as a case study. This frame will provide the city
with the required power, improve the power quality and inject
the redundant to the power system.
This paper presents the effects of enhancing control systems' work conditions on active power filter performance in improving power quality. We will convert the changeable inputs of the controllers into static ones. The high harmonics' amplitude will
be the set-values of the controllers, so the active filter reduces them into zero and then THD will be in its permitted limits.
This paper presents a three phase shunt Active Power Filter (APF) for power quality
improvements in terms of harmonics compensation. The compensation process is based on
measure non-liner load currents and Active Filter currents, and then extract t
he references
from measured currents. Measured currents are then transferred from abc frame to d-q
reference frame. A Synchronous Proportional Integral controller (Synchronous PI
controller) is used. The control signals then drive the Pulse Width Modulation (PWM)
routine, where its output controls the Voltage Source Inverter (VSI) switching devices. The
performance of the Active Filter and the Synchronous PI controller is validated though the
simulink results in MATLAB environment.
