TITLE:
Fuzzy Controlled Ultra-Capacitor Based DVR (UCAP-DVR) for Power Quality Enhancement
AUTHORS:
R. Bhavani, Dr. N. Rathina Prabha
KEYWORDS:
Dynamic Voltage Restorer (DVR), Ultra-Capacitor (UCAP), DC-DC Converter, Voltage Sag, Voltage Swell, Fuzzy Logic Controller (FLC)
JOURNAL NAME:
Circuits and Systems,
Vol.7 No.13,
November
14,
2016
ABSTRACT: In recent years, a rapid decrease in the cost of
various energy storage technologies and their integration into grid becomes a reality with the advent of smart grid. The Dynamic Voltage Restorer (DVR) is a custom power device that has an excellent dynamic capability used to provide voltage sag, swell
compensation in distribution systems. Among
the energy storage devices, Ultra-Capacitors
(UCAP) have ideal characteristics such as high power and
low energy density essential for the compensation of voltage sag and swell, which require high power
for short interval of time. This paper presents an integration of
rechargeable UCAP with DVR. This UCAP-DVR presents a modular,
flexible system configuration that will have an active power capability and also
provide deep, extended mitigation for power quality problems. The DVR is integrated into UCAP via bidirectional DC-DC converter which supports a rigid dc-link voltage for DVR and
also helps in compensating temporary voltage sag and swell. FUZZY LOGIC Controller is used to enhance the performance of UCAP-DVR. The simulation model
for the proposed system has been developed in MAT-LAB and the performance over conventional DVR is
compared with the results obtained.