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)