Design of an Ultracapacitor Based Dynamic Voltage Restorer for Power Quality Enhancement in the Distribution Grid

Dynamic Voltage Restorer is a Power Conditioning equipment that can compensate voltage sag and swell of the source voltage with the integration of Ultracapacitor. The innovative Scheme of this paper is the integration of UCAP with DVR, therefore this configuration of DVR can independently compensate the load voltage without utilization of grid voltage to compensate voltage sag and swell as in the existing system. The UCAP charge or discharge during supplying real power to the DVR. So, it is required to maintain the voltage profile of UCAP, this is achieved by incorporating the Buck-Boost converter between the base of the Inverter and Input stage of UCAP. This DC/DC Bidirectional converter provides the constant dc link voltage for the Voltage Source Inverter(DVR) for satisfying operation. The main complex thing in this work is design and control of DC/DC Buck-Boost Converter and Voltage Source Inverter. The whole model is designed and simulated in MATLAB/Simulink. The control strategies of Bidirectional Converter involve PI controller and DVR is controlled by PWM technique. The performance of DVR is validated with the results. Citation: Shilpa Baraki, U B D T college of engineering; Dr. Ashok Kusagur ,U B D T C ollege of engineering. "Design of an Ultracapacitor Based Dynamic Voltage Restorer for Power Quality Enhancement in the Distribution Grid." Global Research and Development Journal For Engineering 37 2018: 70 - 76.