Hybrid interline dynamic voltage restoring and displacement factor controling device for improving power quality of the distribution

Energy storage technologies are increasing their presence in the market and integration of these technologies into the power grid is slowly becoming a reality. An interline dynamic voltage restorer has used to provide sag and swell the compensation and improvement of displacement power factor during normal condition. The concept of integrating ultra-capacitor based energy storage into an interline dynamic voltage restoring displacement factor controlling device (IVDFC) will able to independently compensate voltage sag and swells without relying on the grid to compensate for fault on the grid. UCAPS have low energy density and high power density ideal characteristics for compensation of voltage sag and swell which are both high power and low energy event. UCAP is integrated into DC-link of the IVDFC through a bi-directional DC-DC convertors which helps in provide stiff DC-link voltage and the integration helps in compensating deeper voltage sag voltage swell and improvement of displacement power factor during normal condition designed control of both the DC-AC inverter and DC-DC are discussed the simulation model of the overall system is developed.