Srf Theory Revisited†To Control Self-Supported Dynamic Voltage Restorer (Dvr) For Unbalanced And Nonlinear Loads
Journal Title: International Journal of Science Engineering and Advance Technology - Year 2015, Vol 3, Issue 11
Abstract
In this paper a fuzzy controller based DVR is proposed for the protection of the sensitive unbalanced nonlinear loads from sag/swell, distortion, and unbalance in supply voltage is achieved. A simple generalized algorithm based on basic synchronous reference frame theory has been developed for the generation of instantaneous reference compensating voltages for controlling a DVR. This novel algorithm makes use of the fundamental positive sequence phase voltages extracted by sensing only two unbalanced and/or distorted line voltages. In addition to this a fuzzy logic controller have been developed to reduce the % THD compared with the conventional method. The compensating voltages when injected in series with a distribution feeder by three single-phase H-bridge voltage-source converters A capacitor-supported DVR does not need any active power during steady-state operation because the injected voltage is in quadrature with the feeder current. The proposed control strategy is validated through simulation results with the help of MATLAB/SIMULINK software.
Authors and Affiliations
Leela Sarvani Palukuru| PG Scholar, Pydah College of Engineering, Kakinada, AP, India, Mr. Y. Raja Babu| Assistant Professor, Pydah College of Engineering, Kakinada, AP, India
Keywords
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