Design and Simulation of a Special Active Filter's Control System to Improve Electric Power Quality Using MATLAB

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 the 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.

Enhancement Performance and Stability of Variable Speed Drive Systems with 12-Pulse Rectifier in Modern Industrial Facilities

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 both 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.