Abstract
There has been an increasing awareness admits customers and utilities regarding superior quality and reliable electric power. The awareness has been triggered by a stupendous increase in the number of nonlinear loads such as power electronic devices. Due to nonlinear loads and low power factor the gravest power quality problems today are voltage sags and swells and harmonic distortion. Therefore, devices like DSTATCOMs are extensively used in power system applications and are able to provide efficient reactive power support to maintain voltage stability. Simulation of DSTATCOM is performed using simpowersystems. Analysis of instantaneous reactive power theory and instantaneous active and reactive current techniques is done which are used for extracting the reference current in the control of the DSTATCOM. These compensation techniques recuperate the ability of DSTATCOM to sustain voltage stability in steady-state and transient conditions. Investigation of the simulation results for both the techniques is done.