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.
