Mitigation of a Voltage Sag Swell by DVR using ANN Techniques for Renewable Energy Resources

Abstract

Voltage sags and swells in the medium and low voltage distribution grid are considered to be the most frequent type of power quality problems based on recent power quality studies. Their impact on sensitive loads is severe. The impact ranges from load disruptions to substantial economic losses up to millions of dollars. Different solutions have been developed to protect sensitive loads against such disturbances but the DVR is considered to be the most efficient and effective solution. Even the conventional concept suffers with effective controller problems.

This proposed concept describes the techniques for compensation of voltage sag and voltage swell by DVR based on Voltage Source Converter (VSC). Voltage source inverters are capable of generating accurate high quality voltage waveforms and form the power electronic heart of the custom power device. The model has to be simulated with MATLAB/Simulink program to demonstrate system behavior of dynamic voltage restorer with hysteresis controller. The operation of the DVR can be explained with non-linear loads. The DVR are also to be demonstrated on the practical distribution bus system.