Modeling of dynamic voltage restorer

ABSTRACTMSc THESISMODELING OF DYNAMIC VOLTAGE RESTORERAhmet TEKEDEPARTMENT OF ELECTRICAL AND ELECTRONICS ENGINEERINGINSTITUTE OF NATURAL AND APPLIED SCIENCESUNIVERSITY OF ÇUKUROVASupervisor: Assoc. Prof. Dr. Mehmet TÜMAYYear: September 2005, Pages: 126Jury: Assoc. Prof. Dr. Mehmet TÜMAYAsst. Prof. Dr. Murat AKSOYAsst. Prof. Dr. Mutlu AVCIThe fast developments in power electronic technology have made it possible tomitigate voltage disturbances in power systems. Among the voltage disturbanceschallenging the industry, the voltage sags are considered the most important problemto the sensitive loads. Dynamic Voltage Restorer (DVR) is a series connected powerelectronic based device that can quickly mitigate the voltage sags in the system andrestore the load voltage to the pre-fault value. DVR is recognized to be the besteffective solution to overcome this problem. The primary advantage of the DVR iskeeping the users always on-line with high quality constant voltage maintaining thecontinuity of production.A new method for the generation of reference voltage for a DVR is presented inthis thesis. The proposed method provides superior performance compared toconventional control methods because of not involving any transformation process.The control scheme is rather simple, flexible in cost and has an excellent voltageregulation capability.The basic purpose of this thesis is analyzing, modeling and simulating theDVR, which protects a 50-kVA sensitive load. The performance and efficiency of theproposed method are investigated with different simulation studies by MATLAB/Simulink program.Keywords: Dynamic Voltage Restorer, Voltage Sag and Power QualityII