A FACT based voltage stabilization and harmonic reduction scheme for a SMIB system

As power electric system becomes complex and severely congested the power delivery challenge becomes increasingly complex. With the limited expansion in the transmission system, utilities are always facing the challenge of improving system security and reliability without a significant investment in new infra structure. The modern power system comes with a new generation of nonlinear loads which extensively use power electronic converters. These new nonlinear elements with their inherent nonlinearity characteristics pose new and additional challenge to electric utility systems. On the other hand intermittent loads and their temporal affects on the power quality have always been a continuous challenge. Inrush currents during induction motor start-stop are always a concern and they affect the system stability. Dynamic voltage fluctuation is always associated with induction motor starting. Flexible AC Transmission has been widely used to enhance power transmission capability and also improve the system dynamic stability. In this paper a Novel Modulated Power Filter Compensation (MPFC) Scheme developed by second author has been validated. This new device with a novel quad-loop control strategy has been tested and validated under severe fault condition and load excursions to validate the effectiveness of the MPFC device in a Single Machine Infinite Bus system (SMIB) AC system in the presence of large induction motor loads and DC Arc type nonlinear load. MATLAB-SIMULINK Software was used for digital simulation purpose to validate the effectiveness of this device in improving the power quality and system stability.