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Power Quality Improvement using Hysteresis Voltage Control of DVR

J Sivasankari, U.Shyamala, M.Vigneshwaran

Power quality is one of the most important issues in present systems. Power quality problems like voltage sag, swell and harmonics are major concern of industrial and commercial electrical consumers this is due to large number of sophisticated electrical and, simple operation and variable switching electronics equipment such as computers, adjustable speed drives, programmable logic controllers and so forth. This equipment often requires high power supplies with high quality. Some devices are sensitive to the load voltage disturbances if these take up to several periods the circuit does not work. Various solutions are presented for this problem. One of the most effective methods is the use of Dynamic Voltage Restorer. The efficiency of the DVR is depends upon the control techniques involved in switching the inverter .In this paper hysteresis voltage control of DVR is used to improve the power quality problems. Hysteresis control has very fast transient response frequency. The performance of the proposed method and achievement of desired compensation are confirmed by the results of the simulation using MATLAB/simulink.