DESIGN AND IMPLEMENTATION OF EXTERNAL CAPACITOR IN DVR SYSTEM FOR IMPROVING THE POWER QUALITY

: Dynamic voltage restorer (DVR) is one product that can provide improved voltage sag and swell compensation with strength storage integration. Ultra capacitors (UCAP) have low-energy density and high-energy density perfect traits for compensation of voltage sags and voltage swells, which are both events that require high electricity for quick spans of time. The novel contribution of this paper lies in the integration of rechargeable UCAP-primarily based totally power storage into the DVR topology. With this integration, the UCAP-DVR tool could have lively power functionality and can be able to independently compensate temporary voltage sags and swells without counting on the grid to compensate for faults on the grid like in the beyond. UCAP is incorporated into dc-hyperlink of the DVR via a bidirectional dc-dc converter, which allows in offering a stiff dc-link voltage, and the included UCAP-DVR device allows in compensating brief voltage sags and voltage swells, which ultimate from 3 s to one min. Complexities involved in the layout and management of each the dc–ac inverter and the dc-dc converter are discussed