IJMTES – AN INTEGRATED DYNAMIC VOLTAGE RESTORER – ULTRACAPACITOR DESIGN FOR IMPROVING POWER QUALITY OF THE DISTRIBUTION GRID

Journal Title : International Journal of Modern Trends in Engineering and Science

Author’s Name : G K Sudha Sree | N Siva Kumar  unnamed

Volume 03 Issue 04 2016

ISSN no:  2348-3121

Page no: 74-78

Abstract – Energy storage technologies are increasing their presence in the market and integration of these technologies into the power grid is slowly becoming a reality. Dynamic Voltage Restorer has been used in the past to provide voltage sag and swell compensation to prevent sensitive loads from voltage disturbances on the utility side. In this paper the concept of integrating ultracapacitor (UCAP) based energy storage into the dynamic voltage restorer topology has been explored. With this integration the DVR will be able to independently compensate voltage sags and swells without relying on the grid to compensate for faults on the grid. UCAPs have low energy density and high power density ideal characteristics for compensation of voltage sags and voltage swells which are both high power low energy events. UCAP is integrated into dc-link of the DVR through a bi-directional dc-dc converter which helps in providing stiff dc-link voltage and the integration helps in compensating deeper voltage sags, voltage swells for longer durations. Design and control of both the dc-ac inverter and the dc-dc converter are discussed. The simulation model of the overall system is developed and compared to the experimental hardware setup.

Keywords— UCAP, DVR, dc-dc converter, DSP, sag/swell, d-q control, PLL, energy storage Integration 

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