Title A New Method To Improve Power Quality On Distribution Power Grids By Using Ultra Capacitor Beside DSTATCOM Type of Research Presentation Keywords Distribution power grid, UC, DSTATCOM, Normal capacitor, Voltage sag , Harmonic components Abstract As a distribution power grid is subjected to a contingency such as a fault, the voltage of system may be severly deteriorated and becomes harmonically. ... Researchers NAVID TAGHIZADEGAN KALANTARI (First Researcher)، reza eslami (Second Researcher)، siamak esmaeili kojaabad (Third Researcher)