Phases Shifting Transformer Simulation and Application

Phase Shifting Transformer has played an important role in electrical networks to improve their efficiency because it has the ability to control power flow in electrical transmission network that can lead to power loss minimization. PST technology is considered as mature technology which is used by transmission system operators. These transformers provide an integrated solution to control power due to the advantages of low economic and high reliability. In this research an exposure to the classification of phase shifting transformers and their application then a simple model for Phase shifting transformer is suggested without seeking in the details of transformer, this model presents the result for using PST via modeling phase shifting voltage, this model is performed using Matlab/Simulink program according to differential equation. Depending on the mathematical model which has been built in an Matlab environment we have a model shows the impact of this transformer through the representation of output voltage , results are verified using Neplan program via a case study demonstrated the role of this type of transformers in controlling power flow in transmission system achieving remarkable power loss reduction and improving voltage profile

"Power quality improvement using Predictive control of Shunt active filter "

This paper proposes a new approach to control a Shunt active filter (SAF) to eliminate harmonic currents and compensate reactive power , this approach called Predictive Direct Power Control (P-DPC) where the Direct Power Control is combined with a Predictive Control , PDC controls active and reactive power to get an unity power factor and when it combined with Predictive Control , the controller can predict future behavior for all possible voltage vectors , and the best vector is chosen for the next sample by minimizing a cost function . we connect this filter with a nonlinear load to the grid and simulate this systemusing Matlab , Simulink and Simpower , the results shows that P-DPC decrease Total Harmonic Distortion (THD%) of line current and make it sinusoidal and improve the power factor .