International Journal of Engineering Research in Electrical and Electronic Engineering (IJEREEE)

Grid Independent Power Quality Improvement Technique using Dynamic Voltage Restorer and Ultracapacitor with Fuzzy Logic Control

Author : VundigalaVenkata Sai Ramya ¹ K. Ravi Sankar ²

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Date of Publication :7th October 2016

Abstract: The reduction of the prices of the storage technologies and development of Smart grid made their integration into the grid easy. Dynamic Voltage Restorer (DVR) along with the energy storage is ideal for compensating the voltage abnormalities i.e., Sags and Swells. Ultracapacitor (UCAP) has high power density and low energy density which is essential for compensation of the voltage fluctuations like Sags and Swells as both these need large power for small amount of time. The rechargeable UCAP integration with DVR is theunique contribution of this paper. With this arrangement the UCAP-DVR system shall be independent of the grid, for compensations during the voltage disturbances, unlike the systems in the past. UCAP is connected into the dc-link of DVR with the help of a Bi-directional dc-dc converter, which retains a stiff dc-link. This whole arrangement can help us in compensating the voltage fluctuations lasting from 3s to 1 min. The Fuzzy Logic Controller is used in the system for smoother operation and less distortion of the output wave. The overall design and simulation models are discussed and developed in detail.

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